Patent ID: 12253260

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, embodiments of the high-temperature oxygen generation device and the high-temperature oxygen generation method according to the present invention will be described with reference toFIGS.1to4as appropriate. In addition, in the drawings used in the following explanation, in order to make the features easy to understand, the featured parts may be enlarged for convenience, and the dimensional ratios of each component may not be the same as the actual ones. Further, although the materials and the like exemplified in the following description are examples, the present invention is not limited thereto, and the present invention can be appropriately modified without changing the gist thereof.

Structure of High-Temperature Oxygen Generation Device

The configuration of the high-temperature oxygen generation device10of the present embodiment will be described in detail below.

FIG.1is a cross-sectional view showing a high-temperature oxygen generation device10of the present embodiment along the center axis J of the burner1.FIG.2is a cross-sectional view showing another high-temperature oxygen generation device provided with a different burner1A from the burner1shown inFIG.1and further provided with an ignition burner9.FIG.3is a cross-sectional view showing a high-temperature oxygen generation device10B, which is the high-temperature oxygen generation device10A shown inFIG.1further provided with an oxygen lance8. Further,FIG.4is a cross-sectional view showing another burner provided in the high-temperature oxygen generation device.

As shown inFIG.1, the high-temperature oxygen generation device10of the present embodiment mixes high-temperature gas G4and oxygen gas G3to be heated to generate high-temperature oxygen gas G5. The high-temperature oxygen generation device10includes a burner1which generates the high-temperature gas G4, and a preheating chamber7which is provided on the downstream side of the burner1and mixes the high-temperature gas G4and the oxygen gas G3to be heated.

Further, in the high-temperature oxygen generation device10, the burner1includes a combustion chamber5which forms a flame by the fuel gas G1and oxygen gas G2for combustion, a fuel flow path2which supplies the fuel gas G1into the combustion chamber5, flow paths for oxygen for combustion (see reference numerals3and4inFIG.1) which supply the oxygen gas G2for combustion into the combustion chamber5, and a flow path6for oxygen to be heated which supplies the oxygen G3to be heated into the preheating chamber7.

More specifically, the burner1of the high-temperature oxygen generation device10of the present embodiment includes a first oxygen flow path3which is arranged on the center axis J of the burner1and ejects the oxygen gas G2for combustion as the flow path for oxygen for combustion. In addition, as shown inFIG.1, the fuel flow path2is arranged around the first oxygen flow path3, that is, outside the first oxygen flow path3with respect to the center axis J, and ejects the fuel gas G2in the axial direction of the burner1. Further, the burner1includes a second oxygen flow path4which is arranged around the fuel flow path2and ejects the oxygen gas G2for combustion so as to be directed toward the center axis J while inclining with respect to the center axis J of the burner1as the flow path for oxygen for combustion.

The fuel flow path2, the first oxygen flow path3, and the second oxygen flow path4are opened to the combustion chamber5. The flame is formed in the combustion chamber5by the fuel gas G1ejected from the fuel flow path2and the oxygen gas G2for combustion ejected from the first oxygen flow path3and the second oxygen flow path4.

Further, the flow path6for oxygen to be heated communicates with the preheating chamber7and is arranged around the second oxygen flow path4. In the illustrated example, the flow path6for oxygen to be heated is open to the preheating chamber7. The flow path6for oxygen to be heated supplies the oxygen gas G3to be heated toward the preheating chamber7by ejecting the oxygen gas G3to be heated from around the flame.

Further, the high-temperature oxygen generation device10of the illustrated example further includes a cooling jacket11for cooling either one or both of the burner1and the preheating chamber7.

Examples of the fuel gas G1used in the present embodiment include natural gas. In addition, examples of the fuel gas G1include a gas containing a fuel which satisfies conditions such as being flammable, being insoluble in water, and having a large calorific value per unit volume. Specific examples of the fuel gas G1include gases containing hydrocarbon fuels such as liquefied petroleum gas (LPG), city gas, and methane.

Further, examples of the oxygen gas G2for combustion and oxygen gas G3to be heated used in the present embodiment include oxygen-enriched air and oxygen.

As shown inFIG.1, the burner1includes the combustion chamber5, which has a bottomed conical shape and opens so that a tip1aside in the flame-forming direction expands in diameter, and the high-temperature gas G4is generated by forming the flame in the combustion chamber5.

In the illustrated example, the combustion chamber5is a concave portion having a bottomed conical shape, which opens so that the tip1aside in the flame-forming direction expands in diameter. The vertical cross section of the combustion chamber5is substantially trapezoidal. As described above, the burner1generates a flame in the combustion chamber5to generate the high-temperature gas G4toward the downstream side of the burner1, that is, the preheating chamber7.

In the combustion chamber5, the gradient angle of the side wall52from the bottom portion51on the proximal end side to the distal end1aside may be constant. However, as shown in the illustrated example, it is more preferable that a part of the tip1aside have a cylindrical shape because a stable flame can be obtained.

As described above, the fuel flow path2is arranged outside the center axis J, that is, around the first oxygen flow path3, which will be described in detail later, and ejects the fuel gas G1in the axial direction of the burner1.

The opening of the fuel flow path2is arranged so as to open at the bottom51of the combustion chamber5, and is provided so as to eject the fuel gas G1supplied from the fuel flow path2toward the inside of the combustion chamber5.

Although detailed illustration is omitted, the fuel flow path2is arranged, for example, on the circumference centered on the center axis J so as to surround the first oxygen flow path3provided on the center axis J. There are multiple fuel flow paths2parallel to each other and evenly spaced.

As long as the openings of the plurality of fuel flow paths2are opened to the inside of the combustion chamber5, the arrangement interval, the number, the shape, and the like are not particularly limited and can be arbitrarily set.

As described above, the first oxygen flow path (flow path for oxygen for combustion)3is arranged on the center axis J of the burner1, and ejects the oxygen gas G2for combustion in the axial direction of the burner1.

The opening of the first oxygen flow path3is also arranged so as to open at the bottom51of the combustion chamber5like the fuel flow path2. As a result, the oxygen gas G2for combustion supplied from the first oxygen flow path3is ejected toward the combustion chamber5.

As long as the opening of the first oxygen flow path3is open to the combustion chamber5, the shape and the like of the opening of the first oxygen flow path3is not particularly limited, and can be arbitrarily set.

As described above, the second oxygen flow path (flow path for oxygen for combustion)4is arranged around the fuel flow path2. The vicinity of the tip of the second oxygen flow path4, the tip side from the bottom51of the combustion chamber5(hereinafter sometimes referred to as “the vicinity of the tip of the fuel flow path2”) is inclined toward the center axis J side of the burner1. As a result, the oxygen gas G2for combustion is ejected toward the center axis J side. That is, although detailed illustration is omitted, a plurality of the second oxygen flow path4are arranged outside the fuel flow path2on the circumference centered on the center axis J at equal intervals so as to surround the fuel flow path2. The vicinity of the tip thereof is gradually inclined toward the center axis J side toward the tip1aside of the burner1. Further, in the example shown inFIG.1, the opening of the second oxygen flow path4is arranged so as to open at the side wall52of the combustion chamber5.

The angle at the vicinity of the tip of the second oxygen flow path4with respect to the center axis J, that is, the merging angle of the oxygen gas G2for combustion ejected from the second oxygen flow path4with respect to the fuel gas G1ejected from the fuel flow path2and the oxygen gas G2for combustion ejected from the first oxygen flow path3is not particularly limited. However, in consideration of combustion efficiency and the like, the angle is preferably in the range of 10° to 30°.

As long as the openings of the plurality of second oxygen flow paths4are also opened at the side wall52of the combustion chamber5as described above, the arrangement interval, the number, the shape, etc. are not particularly limited and can be arbitrarily set.

As described above, the flow path6for oxygen to be heated is arranged around the second oxygen flow path4and is open so as to communicate with the inside of the preheating chamber7. In the example shown inFIG.1, the flow path6for oxygen to be heated opens at the end face of the tip1aof the burner1.

There are multiple flow paths6for oxygen to be heated. Although detailed illustrations are omitted, the flow paths6for oxygen to be heated are arranged in parallel and evenly spaced so as to surround the second oxygen flow path4on the circumference centered on the center axis J.

The flow path6for oxygen to be heated opens at the end face of the tip1aof the burner1. As a result, flow path6for oxygen to be heated ejects the oxygen gas G3to be heated from around the flame and supplies oxygen gas G3to be heated toward the preheating chamber7. That is, unlike the first oxygen flow path3and the second oxygen flow path4, the flow path6for oxygen to be heated is a flow path through which the oxygen gas G3to be heated flows, not a flow path through which the oxygen gas G2for combustion flows. Therefore, the flow path6for oxygen to be heated opens to the preheating chamber7without opening in the combustion chamber5.

As long as the opening of the flow path6for oxygen to be heated opens to the preheating chamber7, the shape, and the like are not particularly limited and can be arbitrarily set.

The preheating chamber7is provided on the downstream side of the burner1and is a space at which the high-temperature gas G4and the oxygen gas G3to be heated are mixed. The preheating chamber7in the illustrated example has an internal space secured by a cylindrical tube70. By arranging the burner1inside the cylindrical tube70, the preheating chamber7is formed in the space between the burner1and the tip70aof the cylindrical tube70.

In the preheating chamber7, the high-temperature gas G4generated by the flame formed in the combustion chamber5of the burner1is supplied, and the oxygen gas G3to be heated is also supplied through the flow path6for oxygen to be heated. As a result, the high-temperature oxygen gas G5is generated in the preheating chamber7. The high-temperature oxygen gas G5generated is supplied from the tip70aside of the cylindrical tube70toward the outside.

In the high-temperature oxygen generation device10of the example shown inFIG.1, the downstream side of the preheating chamber7is open to the atmosphere, and the pressure at the outlet of each flow path provided in the burner1is atmospheric pressure.

The cooling jacket11is for cooling the burner1or both the burner1and the preheating chamber7. The cooling jacket11of the illustrated example is for cooling both the burner1and the preheating chamber7. That is, the cooling jacket11is cylindrical and has a double tube structure which covers the cylindrical tube70via an annular space. The annular space is a cooling water flow path11athrough which the cooling water W flows. The burner1and the preheating chamber7can be cooled by the flow of the cooling water W.

In the cooling jacket11of the illustrated example, the cooling water W is introduced from the inlet pipe11bside, flows through the cooling water flow path11a, and is discharged from the outlet pipe11c. In the high-temperature oxygen generation device10of the present embodiment, when the cooling water W flows through the cooling water flow path11a, the cooling water W cools the burner1and the cylindrical tube70, so that both the burner1and the preheating chamber7can be cooled.

The cooling jacket11protects each component of the burner1from the high-temperature atmosphere and radiant heat caused by the flame, and suppresses transient heating in the combustion chamber5.

The action and effects obtained by the high-temperature oxygen generation device10of the present embodiment will be described below.

Generally, when the ejection velocity of each gas ejected from the burner is slow, a flashback occurs or the jet is weak, so that it easily misfires due to the influence of an external disturbance. On the other hand, when the ejection velocity of each gas is too fast, the flame will rise, and in this case as well, a misfire is likely to occur. Further, in a burner using oxygen gas, since the flame temperature becomes a high-temperature exceeding 2000° C., it is necessary to provide appropriate protection so that the nozzle is not melted.

In order to solve the problems, in the high-temperature oxygen generation device10of the present embodiment, the burner1includes the combustion chamber5which forms the flame by the fuel gas G1and the oxygen gas G2for combustion, the fuel flow path2which supplies the fuel gas G1into the combustion chamber5, the flow path for oxygen for combustion (the first oxygen flow path3and the second oxygen flow path4) which supplies the oxygen gas G2for combustion into the combustion chamber5, and the flow path6for oxygen to be heated which supplies the oxygen gas G3to be heated toward the preheating chamber7. In other words, in the high-temperature oxygen generation device10, the supply flow path for oxygen gas is divided into the flow path (first oxygen flow path3and second oxygen flow path4) for the oxygen gas G2for combustion which is used in the combustion with the fuel gas G1and the flow path (the flow path6for oxygen to be heated) for oxygen gas G3to be heated which is used in mixing with the high-temperature gas after combustion, and the combustion chamber5is arranged independently of the preheating chamber7.

As a result, according to the high-temperature oxygen generation device10, it is possible to prevent the flame formed by the fuel gas G1and the oxygen gas G2for combustion from misfiring due to the influence of the flow of oxygen gas G3to be heated from the flow path6for oxygen to be heated. Further, since the flow path6for oxygen to be heated through which the oxygen gas G3to be heated, which is not subjected to combustion, is provided along the center axis J of the burner1, cooling effects on the entire burner1can be obtained, and at the same time, cooling effects on the inner wall of the cylindrical tube70can also be obtained.

More specifically, in the high-temperature oxygen generation device10of the present embodiment, the first oxygen flow path3is arranged on the center axis J of the burner1, and ejects the oxygen gas G2for combustion in the axial direction of the burner1. Further, the fuel flow path2is arranged around the first oxygen flow path3and ejects the fuel gas G1in the axial direction of the burner1. Further, the second oxygen flow path4is arranged around the fuel flow path2, and the vicinity of the tip thereof is inclined with respect to the center axis J of the burner1. Therefore, the oxygen gas G2for combustion is ejected toward the center axis J side.

In this way, the fuel gas G1is sandwiched by the oxygen gas G2for combustion ejected from the first oxygen flow path3and the second oxygen flow path4. As a result, the combustion state is maintained, and the side wall52and the bottom51of the combustion chamber5can be protected by the oxygen flow by the oxygen gas G2for combustion ejected from the second oxygen flow path4so that the temperature of the side wall52and the bottom51does not rise too much.

Further, the oxygen gas G3to be heated is ejected axially from the flow path6for oxygen to be heated toward the periphery of the flame formed in the combustion chamber5to generate the high-temperature gas G4. Then, the high-temperature gas G4generated and the oxygen gas G3to be heated are mixed in the preheating chamber7. As a result, oxygen heated to a high-temperature, that is, the high-temperature oxygen gas G5can be discharged to the outside.

On the other hand, for example, in the conventional technique as disclosed in Patent Document 2, the fuel flow path is arranged in the center of the burner, and the oxygen flow path is arranged around the fuel flow path. With such a configuration, it becomes extremely difficult to maintain the flame when the ejection velocity of each gas is large.

According to the high-temperature oxygen generation device10of the present embodiment, as shown inFIG.1, the fuel flow path2is sandwiched between the first oxygen flow path3and the second oxygen flow path4. Accordingly, even when the ejection velocity of each gas is large, the flame can be stably maintained.

Further, when the high-temperature oxygen generation device10of the present embodiment is further provided with the cooling jacket11as shown in the illustrated example, the following effects can be obtained.

By providing the cooling jacket11, for example, since the burner1and the cooling water W are in direct contact with each other, the burner1can be sufficiently cooled and can be prevented from being melted. Further, since the burner1and the cooling water W are in contact with each other via another structure (the cylindrical tube70in the illustrated example), the burner1can be sufficiently cooled and can be prevented from being melted. Further, thermal stress can prevent the burner1or the high-temperature oxygen generation device10as a whole from being deformed or damaged. Further, it is possible to minimize the occurrence of fatigue fracture due to repeated application of thermal stress, and it is possible to extend the service life.

In the illustrated example, the cooling jacket11is provided so as to cover from the burner1to the preheating chamber7, but the present invention is not limited to this embodiment. For example, the cooling jacket11may cool only the burner1, and the preheating chamber7may be protected by forming the inner wall of the cylindrical tube70with a refractory material.

Further, the high-temperature oxygen generation device according to the present invention is not limited to the embodiment as shown inFIG.1.

For example, a burner1A, in which the flow path6for oxygen to be heated is arranged in two rows, the inner peripheral side and the outer peripheral side, and a part of the side wall52of the combustion chamber5, that is, the tip1aside has a cylindrical shape, may be provided as in the high-temperature oxygen generation device10A shown inFIG.2.

Further, in the high-temperature oxygen generation device10A shown inFIG.2, an ignition burner9is provided near the tip of the burner1A so as to penetrate the cooling jacket11and the cylindrical tube70. Generally, the burner for high-temperature gas generation provided in the high-temperature oxygen generation device requires an ignition source. Therefore, the high-temperature oxygen generation device10A in the example shown inFIG.2is provided with the ignition burner9. Also, in the high-temperature oxygen generation device10A of the example shown inFIG.2, the downstream side of the preheating chamber7is in a state of being open to the atmosphere, and the pressure at each flow path outlet provided in the burner1A is atmospheric pressure.

Further, as in the high-temperature oxygen generation device10B shown inFIG.3, an oxygen lance8can be further provided to the downstream side of the preheating chamber7in the high-temperature oxygen generation device10A shown inFIG.2. As shown in the illustrated example, the oxygen lance8is connected to the tip70aof the preheating chamber7via the flange81. The flow path area of an internal flow path8bof the oxygen lance8becomes narrower toward the discharge port8aside, and the flow path area is slightly widened only in the vicinity of the discharge port8a. As a result, according to the high-temperature oxygen generation device10B, the high-temperature oxygen gas G5ejected from the discharge port8aof the oxygen lance8has a high ejection velocity. At the same time, according to the high-temperature oxygen generation device10B, preheating can be performed under each gas flow rate condition similar to the atmospheric pressure condition in the high-temperature oxygen generation device10A shown inFIG.2, and the like.

Further, the burner used for the high-temperature oxygen generation device is not limited to the burners1and1A shown inFIGS.1to3. For example, as in the burner1B shown inFIG.4, the supply of oxygen gas to the first oxygen flow path3, the second oxygen flow path4, and the flow path6for oxygen to be heated may be branched from the same source, and the same oxygen gas may be used for the oxygen gas G2for combustion and the oxygen gas G3to be heated.

High-Temperature Oxygen Generation Method

The high-temperature oxygen generation method of the present embodiment is a method of generating the high-temperature oxygen gas G5by using the high-temperature oxygen generation device10of the embodiment above.

That is, in the high-temperature oxygen generation method of the present embodiment, in a case when the high-temperature oxygen is supplied at the maximum pressure, the average velocity of the fuel gas G1in the fuel flow path2of the burner1is U1, the average velocity of the oxygen gas G2for combustion in the first oxygen flow path3is U2, and the average velocity of the oxygen gas G2for combustion in the second oxygen flow path4is U3, these average velocities U1, U2, and U3satisfy the following equations (1) to (3), and in a case at the rated flow rate under atmospheric pressure condition, the average velocity U4of a mixed gas of the fuel gas G1and the oxygen gas G2for combustion on the outlet side of the combustion chamber5satisfies the following equation (4).
10 (m/s)≤U1≤60 (m/s)  (1)
20 (m/s)≤U2≤120 (m/s)  (2)
20 (m/s)≤U3≤120 (m/s)  (3)
U4≤60 (m/s)  (4)

As described above, when high-temperature oxygen is generated by a conventional method using a conventional device, the velocity is lower under high-pressure conditions than that under atmospheric pressure conditions. Therefore, in the high-temperature oxygen generation method of the present embodiment, when the average velocity U1of the fuel gas G1, the average velocity U2of the oxygen gas G2for combustion in the first oxygen flow path3, and the average velocity U3of the oxygen gas G2for combustion in the second oxygen glow path4are the assumed maximum pressures, the average velocities U1, U2, and U3satisfy the equations (1) to (3) above. As a result, it is possible to prevent flashbacks and misfires due to a decrease in velocity, as well as blow-off of the flame due to excessive velocity.

In the high-temperature oxygen generation method of the present embodiment, when the high-temperature oxygen is supplied at the maximum pressure, the average velocities U1, U2, and U3satisfy the following equations (1) to (3), respectively, and a stable flame can be maintained even under atmospheric pressure. Further, in the present embodiment, when the average velocity U4of the mixed gas of the fuel gas G1and the oxygen gas G2for combustion at the outlet side of the combustion chamber5is the rated flow rate under atmospheric pressure conditions, it is possible to further improve the stability of the flame by designing the burner1so as to satisfy equation (4) above.

According to the present embodiment, by using the high-temperature oxygen generation device10having the configuration above, each gas can form a stable flame after being ejected into the combustion chamber5at high pressure. Further, according to the present embodiment, since the fuel flow path2is sandwiched between the first oxygen flow path3and the second oxygen flow path4under atmospheric pressure at which the ejection velocity is large, and the average velocity of each gas in the combustion chamber5is maintained appropriately, it is possible to maintain a sufficiently stable flame.

Action and Effects

As described above, in the high-temperature oxygen generation device10of the present embodiment, the burner1includes the combustion chamber5which forms the flame with the fuel gas G1and the oxygen gas G2for combustion, the fuel flow path2which supplies the fuel gas G1into the combustion chamber5, the first oxygen flow path3and the second oxygen flow path4which supply the oxygen gas G2for combustion into the combustion chamber5, and the flow path6for oxygen to be heated which supplies the oxygen gas G3to be heated into the preheating chamber7. In this way, the oxygen gas supply flow path is divided into the flow path for the oxygen gas G2for combustion which is used for combustion with the fuel gas G1, and the flow path for the oxygen gas G3to be heated which is used in mixing with the high-temperature gas G4after combustion, and the combustion chamber5is arranged independently of the preheating chamber7. Thereby, it is possible to prevent the flame from misfire due to the influence of the flow of the oxygen gas G3to be heated from the flow path6for oxygen to be heated. In addition, the flow path6for oxygen to be heated through which the oxygen gas G3to be heated, which is not subjected to combustion, can be used to cool the burner1and the cylindrical tube70.

Therefore, the high-temperature oxygen generation device according to the present embodiment has a specification with high supply pressure, but can also be used under atmospheric pressure, and can efficiently supply the preheated high-temperature oxygen gas regardless of pressure conditions from normal pressure to high pressure, without requiring upsizing or expansion of the equipment.

In addition, according to high-temperature oxygen generation method of the present embodiment, in a case when the high-temperature oxygen is supplied at the maximum pressure, the average velocity of the fuel gas G1in the fuel flow path2of the burner1is U1, the average velocity of the oxygen gas G2for combustion in the first oxygen flow path3is U2, and the average velocity of the oxygen gas G2for combustion in the second oxygen flow path4is U3, these average velocities U1, U2, and U3are limited in the optimal ranges, and in a case at the rated flow rate under atmospheric pressure conditions, the average velocity U4of a mixed gas of the fuel gas G1and the oxygen gas G2for combustion on the outlet side of the combustion chamber5is limited to the optimal range. As a result, it is possible to prevent the flame from being blown off due to excessive velocity, in addition to flashback and misfire due to a decrease in velocity.

Therefore, it is possible to supply the preheated high-temperature oxygen gas G5regardless of the pressure conditions from normal pressure to high pressure and without requiring upsizing or expansion of equipment.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments as described above. Various modifications and changes are possible within the scope of the gist of the present invention described within the scope of claims.

EXAMPLES

Hereinafter, the high-temperature oxygen generation device and the high-temperature oxygen generation method according to the present invention will be described in more detail by examples, but the present invention is not limited thereto.

Example 1

In Example 1, a test was carried out using the high-temperature oxygen generation device10A as shown inFIG.2including the burner1A which generates the high-temperature gas G4, and the preheating chamber7which is provided on the downstream side of the burner1A, and mixes the high-temperature gas G4and the oxygen gas G3to be heated. Specifically, the high-temperature oxygen generation device10A was used, which is provided with the burner1A including the combustion chamber5which forms a flame with the fuel gas G1and the oxygen gas G2for combustion, the fuel flow path2which supplies the fuel gas G1into the combustion chamber5, the first oxygen flow path3and the second oxygen flow path4which supply the oxygen gas G2for combustion into the combustion chamber5, and the flow path6for oxygen to be heated, which supplies the oxygen gas G3to be heated toward the preheating chamber7, and is arranged in two rows on the inner peripheral side and the outer peripheral side, and the ignition burner9which is the ignition source of the burner1. The angle with respect to the center axis J at the vicinity of the tip of the second oxygen flow path4was set to 20°.

In the present example, the downstream side of the preheating chamber7was open to the atmosphere, and each flow path outlet provided in the burner1A was set to the atmospheric pressure condition.

Then, the flow rate of the high-temperature oxygen gas G5discharged from the preheating chamber7was set to 200 Nm3/h, and the preheating temperature of the high-temperature oxygen gas G5was set to 500° C. As a result, it was clarified that the preheating temperature could be achieved under each condition shown in Table 1 below.

TABLE 1TestTest itemsconditionsFlow rate of fuel gas (natural gas) [Nm3/h]4Total flow rate of oxygen gas (high-temperature oxygen gas)195[Nm3/h]Temperature of discharged gas (high-temperature oxygen gas)500[° C.]Oxygen concentration in discharged gas (high-temperature92.8oxygen gas) [% by volume]Average velocity U1 in fuel flow path [m/s]140Average velocity U2 in first oxygen flow path [m/s]520Average velocity U3 in second oxygen flow path [m/s]520Average velocity U4 at outlet of combustion chamber [m/s]32(Mixed gas of fuel gas and oxygen gas for combustion)

Example 2

In Example 2, the test was carried out using the high-temperature oxygen generation device10B shown inFIG.3in which the oxygen lance8was further attached to the downstream side of the preheating chamber7in the high-temperature oxygen generation device10A used in Example 1. Specifically, the high-temperature oxygen generation device10B was used in the present example, which includes the oxygen lance8having the internal flow path8bin which the flow path area becomes narrower toward the discharge port8aside and the flow path area slightly expands only in the vicinity of the discharge port8ato the downstream side of the preheating chamber7.

The oxygen lance8has a specification with high supply pressure in which when the flow rate of the discharged high-temperature oxygen gas G5is 200 Nm3/h and the preheating temperature of the high-temperature oxygen gas G5is 500° C., the pressure on the inlet side of the oxygen lance8is 0.7 MPaG.

In the present example, as shown in Table 2 below, it was clarified that even when the oxygen lance8was used, the preheating temperature could be achieved under the same gas flow rate conditions as those under the atmospheric pressure condition described in Example 1.

TABLE 2TestTest itemsconditionsFlow rate of fuel gas (natural gas) [Nm3/h]4Total flow rate of oxygen gas (high-temperature oxygen gas)195[Nm3/h]Temperature of discharged gas (high-temperature oxygen gas)500[° C.]Oxygen concentration in discharged gas (high-temperature92.8oxygen gas) [% by volume]Average velocity U1 in fuel flow path [m/s]17.5Average velocity U2 in first oxygen flow path [m/s]65Average velocity U3 in second oxygen flow path [m/s]65Average velocity U4 at outlet of combustion chamber [m/s]4(Mixed gas of fuel gas and oxygen gas for combustion)

Comparative Example 1

In Comparative Example 1, the conventional high-temperature oxygen generation device having a specification with atmospheric supply pressure and including the burner100shown inFIG.5and which includes the fuel flow path102which communicates with the combustion chamber105on the center axis J, and the flow path104of oxygen for combustion which corresponds to the second oxygen flow path4shown inFIGS.1and2around the fuel flow path102, but does not include an oxygen flow path corresponding to the first oxygen flow path3shown inFIG.1, was used to examine whether or not preheating was possible at each set preheating temperature.

The burner100of the comparative example shown inFIG.5has the flow path for oxygen to be heated106, which is arranged around the flow path104for oxygen for combustion and is provided in two rows, the inner peripheral side and the outer peripheral side.

That is, in Comparative Example 1, since the downstream side of the preheating chamber was open to the atmosphere, each flow path outlet provided in the burner100was under atmospheric pressure.

Further, in Comparative Example 1, the burner100was used, which was designed so that the ejection velocity of the fuel ejected from the fuel flow path102was 17.5 m/s and the ejection velocity of oxygen for combustion ejected from the flow path104for oxygen for combustion was 65 m/s under atmospheric pressure conditions.

Then, in Comparative Example 1, when the preheating temperature was set in the range of 200° C. to 700° C. at every 100° C., whether preheating was possible or impossible was examined, and the results are shown in Table 3.

Table 3 below also shows the results of the same test using the devices of Example 1 (atmospheric pressure), Example 2 (high pressure: 0.7 MPaG), and Comparative Example 2 below. Also, in Table 3 below, “∘” is marked in the column of the conditions for which it was confirmed that preheating is possible.

As shown in Table 3 below, when the high-temperature oxygen generation device of Examples 1 and 2 according to the present invention was used, the preheating temperature could be realized in the range of 200 to 700° C. On the other hand, in the high-temperature oxygen generation device using the burner100of Comparative Example 1, it was possible to preheat in the entire range of 200 to 700° C. under atmospheric pressure conditions, but it was impossible to preheat to 200° C. under high pressure, and it was impossible to carry out the test in which the preheating was higher than 200° C.

TABLE 3PreheatingExample 1Example 2Comparative Example 1Comparative Example 2temperatureAtmospheric0.7Atmospheric0.7Atmospheric0.7[° C.]pressure[MPaG]pressure[MPaG]pressure[MPaG]200∘∘∘x∘∘300∘∘∘—x∘400∘∘∘——∘500∘∘∘——∘600∘∘∘——∘700∘∘∘——∘

Comparative Example 2

In Comparative Example 2, the high-temperature oxygen generation device having a specification with high supply pressure including the conventional burner101shown inFIG.5was used to examine whether or not preheating was possible at each set preheating temperature.

That is, in Comparative Example 2, the ambient pressure was set to a high pressure of 0.7 MPaG, and each flow path outlet in the burner101was set to high-pressure conditions.

Further, in Comparative Example 2, the burner101was used in which when the ambient pressure was as high as 0.7 MPaG, the ejection velocity of the fuel ejected from the fuel flow path102was 17.5 m/s, and the ejection velocity of oxygen for combustion ejected from the combustion oxygen flow path104was 65 m/s.

As shown in Table 3 above, in the high-temperature oxygen generation device including the burner101of Comparative Example 2, it was possible to preheat in the entire range of 200° C. to 700° C. under high-pressure conditions, and under atmospheric pressure, the combustion conditions were unstable to preheat to 300° C. and it was impossible to carry out the test in which the preheating temperature was higher than 300° C.

Evaluation Result

From the results of the examples above, it is clear that the high-temperature oxygen generation device according to the present invention could preheat oxygen corresponding to a wide range of pressure conditions from normal pressure to high pressure which could not be achieved by the conventional high-temperature oxygen generation device.

INDUSTRIAL APPLICABILITY

The high-temperature oxygen generation device according to the present invention has a specification with high supply pressure, but can also be used under atmospheric pressure, and can efficiently supply preheated high-temperature oxygen gas regardless of pressure conditions from normal pressure to high pressure, without requiring upsizing or expansion of the equipment. Accordingly, the high-temperature oxygen generation device and the high-temperature oxygen generation method according to the present invention is suitable for heating in a furnace in various industrial furnaces.

EXPLANATION OF REFERENCE NUMERAL

10,10A,10B high-temperature oxygen generation device1,1A,1B burner1atip2fuel flow path3first oxygen flow path4second oxygen flow path5combustion chamber6flow path for oxygen to be heated7preheating chamber70atip8oxygen lance8adischarge port8bflow path8b81flange9ignition burner11cooling jacket11acooling water flow path11bentrance pipe11cexit pipeJ center axisW cooling waterG1fuel gasG2oxygen gas for combustionG3oxygen gas to be heatedG4high-temperature gasG5high-temperature oxygen gas