Patent ID: 12251660

DETAILED DESCRIPTION OF THE EMBODIMENTS

A technical scheme of the disclosure will be further explained by specific embodiments with attached drawings.

The disclosure provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. As shown in the FIGURE, a hydrolysis reaction device includes a tower body, where a top of the tower body is provided with an air inlet channel7, and a bottom of the tower body is provided with an air outlet channel8, and functional zones are arranged in the tower body. The functional zones are sequentially an air inlet zone1, a first protective agent zone2, a first transition zone3, a second protective agent zone4, a second transition zone, a hydrolysis zone5and an air outlet zone6along a gas direction, and adjacent functional zones are communicated. Feed holes9and discharge holes10are uniformly arranged on an outer side surface of the tower body. Further, at least one sealing element is arranged both on the air inlet channel7and the air outlet channel8, and the sealing element is a sealing valve.

In the disclosure, a hydrolysis reaction may be carried out efficiently by providing a functional partition hydrolysis reaction device. Gas in a tower radially passes through protective agent zones and the hydrolysis zone5. Compared with a traditional axial packing hydrolysis device, a contact area between the gas and a protective agent and the hydrolyzing agent is increased, while a pressure loss of the device is reduced. Moreover, the protective agent and a hydrolyzing agent are fully contacted with the gas, so a utilization rate is high.

It should be noted that blast furnace gas according to the disclosure enters the device from the air inlet zone1at the top, is diverted by a baffle, and then sequentially passes through the first protective agent zone for dechlorination, the second protective agent zone for dechlorination and decyanation or hydrolysis, and a hydrolyzing agent zone for hydrolysis, so that carbonyl sulfur in the gas is converted into hydrogen sulfide and discharged from the air outlet zone6at the bottom. Because of special functional zones, impurities in the blast furnace gas are removed first, and then the hydrolysis reaction is carried out, which improves the utilization rate and a lifetime of the hydrolyzing agent, so that the hydrolysis reaction may be carried out efficiently. Moreover, the gas in the tower radially passes through the protective agent zones and the hydrolyzing agent zone, so that compared with the traditional axial packing hydrolysis device, the contact area between the gas and the protective agent and the hydrolyzing agent is increased, and a pressure loss of the device is reduced at the same time, and the protective agent and the hydrolyzing agent are fully contacted with the gas, so that the utilization rate is high.

It should be further noted that the disclosure has no special limitation on an overall appearance structure of the hydrolysis reaction device, and those skilled in the art may make adaptive adjustments. The tower body may be cylindrical, and the tower body may be set as a pressure vessel or a non-pressure vessel according to its placement position. If the tower body is set before blast furnace top gas recovery turbine unit (TRT/BPTR) residual pressure power generation, the tower body is a pressure vessel, and if the tower body is set after the TRT/BPTR residual pressure power generation, the tower body is a non-pressure vessel, especially before the TRT/BPTR residual pressure power generation.

In addition, a space ratio of the protective agent and the hydrolyzing agent in the hydrolysis reaction device is high, adaptability to working conditions is good, an operation rate is high, and a pressure drop is small, so that hydrolysis conversion efficiency of the blast furnace gas may be significantly improved, and considerable economic benefits may be achieved.

The functional zones are coaxially arranged, and a middle of the first protective agent zone2, a middle of the second protective agent zone4and a middle of the hydrolysis zone5are all provided with gas channels, a diameter of the first protective agent zone2is smaller than a diameter of the tower body, a diameter of the second protective agent zone4is smaller than the diameter of the tower body, and a diameter of the hydrolysis zone5is smaller than the diameter of the tower body. A gas flow path is formed between an outer surface of the first protective agent zone2and an inner wall of the tower body, a gas flow path is formed between an outer surface of the second protective agent zone4and the inner wall of the tower body, and a gas flow path is formed between an outer surface of the hydrolysis zone5and the inner wall of the tower body.

The discharge holes9are provided with at least two, and the discharge holes10are provided with at least two. The first protective agent zone2is provided with the feed holes9on an outer surface of the tower body corresponding to one side close to the air inlet zone1, and an other side of the first protective agent zone2is connected with the discharge holes10through a pipeline. The second protective agent zone4is provided with the feed holes9on the outer surface of the tower body corresponding to one side close to the first transition zone3, and an other side of the second protective agent zone4is connected with the discharge holes10through a pipeline. The hydrolysis zone5is provided with the feed holes9on the outer surface of the tower body corresponding to one side close to the second transition zone, and an other side of the hydrolysis zone5is connected with the discharge holes10through a pipeline.

At least one layer of baffle is arranged in the air inlet zone1. At least one baffle vertebra is arranged in the air outlet zone6. It should be noted that a shape, a size and a material of the baffle are not particularly limited in the disclosure, and those skilled in the art may make adaptive adjustments according to an actual situation. Among them, a shape of the baffle may be rectangular, square, etc.

The first protective agent zone is filled with a dechlorination agent. The dechlorination agent is a composite metal oxide dechlorination agent, and the composite metal oxide dechlorination agent is a calcium oxide-zinc oxide dechlorination agent, and the dechlorination agent is any one or a combination of two or more of spherical, cylindrical or honeycomb.

The second protective agent zone is filled with adsorbent. The adsorbent is any one or a combination of two of activated carbon and alumina, and the adsorbent is any one or a combination of two or more of spherical, cylindrical or honeycomb.

The hydrolysis zone5is filled with a hydrolyzing agent. The hydrolyzing agent is any one or a combination of two of alumina and zinc oxide, and the hydrolyzing agent is any one or a combination of two or more of spherical, cylindrical or honeycomb.

A diameter ratio of the first protective agent zone2, the second protective agent zone4and the hydrolysis zone5is (0.65-0.85):1:1, and may be, for example, 0.65:1, 0.67:1, 0.68:1, 0.7:1, 0.72:1, 0.74:1, 0.76:1, 0.78:1, 0.8:1, 0.82:1, 0.84:1 and 0.85:1. However, the ratio is not limited to listed values, and other unlisted values within this numerical range are also applicable.

A height ratio of the first protective agent zone2, the second protective agent zone4and the hydrolysis zone5is (0.55-0.75):(0.65-1):1, and may be, for example, 0.55:0.65:1, 0.67:0.68:1, 0.68:0.7:1, 0.7:0.8:1, 0.72:0.9:1, 0.74:0.96:1 and 0.75:1:1. However, the ratio is not limited to listed values, and other unlisted values within this numerical range are also applicable.

A volume space velocity of the first protective agent zone2is 1200-3600 h−1, and may be, for example, 1200 h−1, 1400 h−1, 1600 h−1, 1800 h−1, 2000 h−1, 2300 h−1, 2600 h−1, 2900 h−1, 3000 h−1, 3200 h−1, 3400 h−1, and 3600 h−1. However, the ratio is not limited to listed values, and other unlisted values within this numerical range are also applicable.

A volume space velocity of the second protective agent zone4is 870-3000 h−1, and may be, for example, 870 h−1, 880 h−1, 900 h−1, 1000 h−1, 1400 h−1, 1800 h−1, 1900 h−1, 2000 h−1, 2200 h−1, 2400 h−1, 2800 h−1and 3000 h−1. However, the volume space velocity is not limited to the listed values, and other unlisted values within this numerical range are also applicable.

A volume space velocity of the hydrolysis zone5is 550-2500 h−1, and may be, for example, 550 h−1, 600 h−1, 800 h−1, 950 h−1, 1000 h−1, 1200 h−1, 1400 h−1, 1800 h−1, 2000 h−1, 2200 h−1, 2400 h−1, 2500 h−1. However, the volume space velocity is not limited to the listed values. Other unlisted values within this numerical range are also applicable.

The outer surface of the first protective agent zone2is provided with a perforated plate or a partition group, the outer surface of the second protective agent zone4is provided with a perforated plate or a partition group, and the outer surface of the hydrolysis zone5is provided with a perforated plate or a partition group. A diameter of the perforated plate is smaller than a diameter of the dechlorination agent, the diameter of the perforated plate is smaller than a diameter of the adsorbent, and the diameter of the perforated plate is smaller than a diameter of the hydrolyzing agent. A porosity of the perforated plate is more than 80%, for example, the porosity may be 81%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 98%, etc. However, the porosity is not limited to listed values, and other unlisted values within this numerical range are also applicable.

It should be noted that a material of the perforated plate and shapes and sizes of the holes on the perforated plate are not specifically limited, and those skilled in the art may make adaptive adjustments according to the actual situation, where the shapes of the holes may be circular, rectangular and the like.

The partition group includes a plurality of louver partitions. The louver partitions are staggered to form the partition group. It should be noted that shapes, sizes and materials of the louver partitions are not particularly limited in the disclosure, and those skilled in the art may make adaptive adjustments according to the actual situation. Among them, the shapes of the louver partitions may be rectangular, square, etc. It should be noted that a number of “plurality” in the disclosure is not particularly limited, and may be 10, 20, 30, 40, 50 or 60, and a specific application number should be configured according to a size of a whole device, which should be known to those skilled in the art.

Embodiment 1

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas, wherethe hydrolysis reaction device includes a tower body, where a top of the tower body is provided with an air inlet channel7, and a bottom of the tower body is provided with an air outlet channel8, and functional zones are arranged in the tower body. The functional zones are sequentially an air inlet zone1, a first protective agent zone2, a first transition zone3, a second protective agent zone4, a second transition zone, a hydrolysis zone5and an air outlet zone6along a gas direction, and adjacent functional zones are communicated. Feed holes9and discharge holes10are uniformly arranged on an outer side surface of the tower body. Further, the air inlet channel7and the air outlet channel8are respectively provided with a sealing element, and the sealing element is a sealing valve.

The functional zones are coaxially arranged, and a middle of the first protective agent zone2, a middle of the second protective agent zone4and a middle of the hydrolysis zone5are all provided with gas channels, a diameter of the first protective agent zone2is smaller than a diameter of the tower body, a diameter of the second protective agent zone4is smaller than the diameter of the tower body, and a diameter of the hydrolysis zone5is smaller than the diameter of the tower body. A gas flow path is formed between an outer surface of the first protective agent zone2and an inner wall of the tower body, a gas flow path is formed between an outer surface of the second protective agent zone4and the inner wall of the tower body, and a gas flow path is formed between an outer surface of the hydrolysis zone5and the inner wall of the tower body.

Two feed holes9are provided, and two discharge holes10are provided. The first protective agent zone2is provided with the feed holes9on an outer surface of the tower body corresponding to one side close to the air inlet zone1, and an other side of the first protective agent zone2is connected with the discharge holes10through a pipeline. The second protective agent zone4is provided with the feed holes9on the outer surface of the tower body corresponding to one side close to the first transition zone3, and an other side of the second protective agent zone4is connected with the discharge holes10through a pipeline. The hydrolysis zone5is provided with the feed holes9on the outer surface of the tower body corresponding to one side close to the second transition zone, and an other side of the hydrolysis zone5is connected with the discharge holes10through a pipeline.

One layer of baffle is arranged in the air inlet zone1. One baffle vertebra is arranged in the air outlet zone6.

The first protective agent zone is filled with a dechlorination agent. The dechlorination agent is a composite metal oxide dechlorination agent, and the composite metal oxide dechlorination agent is a calcium oxide-zinc oxide dechlorination agent, and the dechlorination agent is spherical. The second protective agent zone is filled with adsorbent. The adsorbent is activated carbon, and the adsorbent is spherical. The hydrolysis zone5is filled with a hydrolyzing agent. The hydrolyzing agent is alumina, and the hydrolyzing agent is spherical.

A diameter ratio of the first protective agent zone2, the second protective agent zone4and the hydrolysis zone5is 0.65:1:1. A height ratio of the first protective agent zone2, the second protective agent zone4and the hydrolysis zone5is 0.55:0.65:1. A volume space velocity of the first protective agent zone2is 1200 h−1, a volume space velocity of the second protective agent zone4is 870 h−1, and a volume space velocity of the hydrolysis zone5is 550 h−1.

The outer surface of the first protective agent zone2is provided with a perforated plate, the outer surface of the second protective agent zone4is provided with a perforated plate, and the outer surface of the hydrolysis zone5is provided with a perforated plate. A diameter of the perforated plate is smaller than a diameter of the dechlorination agent, the diameter of the perforated plate is smaller than a diameter of the adsorbent, and the diameter of the perforated plate is smaller than a diameter of the hydrolyzing agent. A porosity of the perforated plate is 82%.

Embodiment 2

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas, wherethe hydrolysis reaction device includes a tower body, where a top of the tower body is provided with an air inlet channel7, and a bottom of the tower body is provided with an air outlet channel8, and functional zones are arranged in the tower body. The functional zones are sequentially an air inlet zone1, a first protective agent zone2, a first transition zone3, a second protective agent zone4, a second transition zone, a hydrolysis zone5and an air outlet zone6along a gas direction, and adjacent functional zones are communicated. Feed holes9and discharge holes10are uniformly arranged on an outer side surface of the tower body. Further, the air inlet channel7and the air outlet channel8are respectively provided with two sealing elements, and the scaling elements are sealing valves.

The functional zones are coaxially arranged, and a middle of the first protective agent zone2, a middle of the second protective agent zone4and a middle of the hydrolysis zone5are all provided with gas channels, a diameter of the first protective agent zone2is smaller than a diameter of the tower body, a diameter of the second protective agent zone4is smaller than the diameter of the tower body, and a diameter of the hydrolysis zone5is smaller than the diameter of the tower body. A gas flow path is formed between an outer surface of the first protective agent zone2and an inner wall of the tower body, a gas flow path is formed between an outer surface of the second protective agent zone4and the inner wall of the tower body, and a gas flow path is formed between an outer surface of the hydrolysis zone5and the inner wall of the tower body.

There feed holes9are provided, and there discharge holes10are provided. The first protective agent zone2is provided with the feed holes9on an outer surface of the tower body corresponding to one side close to the air inlet zone1, and an other side of the first protective agent zone2is connected with the discharge holes10through a pipeline. The second protective agent zone4is provided with the feed holes9on the outer surface of the tower body corresponding to one side close to the first transition zone3, and an other side of the second protective agent zone4is connected with the discharge holes10through a pipeline. The hydrolysis zone5is provided with the feed holes9on the outer surface of the tower body corresponding to one side close to the second transition zone, and an other side of the hydrolysis zone5is connected with the discharge holes10through a pipeline.

Two layers of baffles are arranged in the air inlet zone1. Two baffle vertebrae are arranged in the air outlet zone6.

The first protective agent zone is filled with a dechlorination agent. The dechlorination agent is a composite metal oxide dechlorination agent, and the composite metal oxide dechlorination agent is a calcium oxide-zinc oxide dechlorination agent, and the dechlorination agent is cylindrical. The second protective agent zone is filled with adsorbent. The adsorbent is activated carbon, and the adsorbent is cylindrical. The hydrolysis zone5is filled with a hydrolyzing agent. The hydrolyzing agent is zinc oxide, and the hydrolyzing agent is cylindrical.

A diameter ratio of the first protective agent zone2, the second protective agent zone4and the hydrolysis zone5is 0.75:1:1. A height ratio of the first protective agent zone2, the second protective agent zone4and the hydrolysis zone5is 0.65:0.8:1. A volume space velocity of the first protective agent zone2is 2400 h−1, a volume space velocity of the second protective agent zone4is 2000 h−1, and a volume space velocity of the hydrolysis zone5is 1800 h−1.

The outer surface of the first protective agent zone2is provided with a perforated plate, the outer surface of the second protective agent zone4is provided with a perforated plate, and the outer surface of the hydrolysis zone5is provided with a perforated plate. A diameter of the perforated plate is smaller than a diameter of the dechlorination agent, the diameter of the perforated plate is smaller than a diameter of the adsorbent, and the diameter of the perforated plate is smaller than a diameter of the hydrolyzing agent. A porosity of the perforated plate is 90%.

Embodiment 3

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas, wherethe hydrolysis reaction device includes a tower body, where a top of the tower body is provided with an air inlet channel7, and a bottom of the tower body is provided with an air outlet channel8, and functional zones are arranged in the tower body. The functional zones are sequentially an air inlet zone1, a first protective agent zone2, a first transition zone3, a second protective agent zone4, a second transition zone, a hydrolysis zone5and an air outlet zone6along a gas direction, and adjacent functional zones are communicated. Feed holes9and discharge holes10are uniformly arranged on an outer side surface of the tower body. Further, one sealing element is arranged on the air inlet channel7and the air outlet channel8, and the sealing element is a scaling valve.

The functional zones are coaxially arranged, and a middle of the first protective agent zone2, a middle of the second protective agent zone4and a middle of the hydrolysis zone5are all provided with gas channels, a diameter of the first protective agent zone2is smaller than a diameter of the tower body, a diameter of the second protective agent zone4is smaller than the diameter of the tower body, and a diameter of the hydrolysis zone5is smaller than the diameter of the tower body. A gas flow path is formed between an outer surface of the first protective agent zone2and an inner wall of the tower body, a gas flow path is formed between an outer surface of the second protective agent zone4and the inner wall of the tower body, and a gas flow path is formed between an outer surface of the hydrolysis zone5and the inner wall of the tower body.

Four feed holes9are provided, and four discharge holes10are provided. The first protective agent zone2is provided with the feed holes9on an outer surface of the tower body corresponding to one side close to the air inlet zone1, and an other side of the first protective agent zone2is connected with the discharge holes10through a pipeline. The second protective agent zone4is provided with the feed holes9on the outer surface of the tower body corresponding to one side close to the first transition zone3, and an other side of the second protective agent zone4is connected with the discharge holes10through a pipeline. The hydrolysis zone5is provided with the feed holes9on the outer surface of the tower body corresponding to one side close to the second transition zone, and an other side of the hydrolysis zone5is connected with the discharge holes10through a pipeline.

Four layers of baffles are arranged in the air inlet zone1. Four baffle vertebrae are arranged in the air outlet zone6.

The first protective agent zone is filled with a dechlorination agent. The dechlorination agent is a composite metal oxide dechlorination agent, and the composite metal oxide dechlorination agent is a calcium oxide-zinc oxide dechlorination agent, and the dechlorination agent is honeycomb. The second protective agent zone is filled with adsorbent. The adsorbent is activated carbon, and the adsorbent is honeycomb. The hydrolysis zone5is filled with a hydrolyzing agent. The hydrolyzing agent is aluminum oxide, and the hydrolyzing agent is honeycomb.

A diameter ratio of the first protective agent zone2, the second protective agent zone4and the hydrolysis zone5is 0.85:1:1. A height ratio of the first protective agent zone2, the second protective agent zone4and the hydrolysis zone5is 0.75:1:1. A volume space velocity of the first protective agent zone2is 3600 h−1, a volume space velocity of the second protective agent zone4is 3000 h−1, and a volume space velocity of the hydrolysis zone5is 2500 h−1.

The outer surface of the first protective agent zone2is provided with a partition group, the outer surface of the second protective agent zone4is provided with a partition group, and the outer surface of the hydrolysis zone5is provided with a partition group. The partition group includes 60 louver partitions, and the 60 louver partitions are staggered to form the partition group.

Embodiment 4

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, a diameter ratio of a first protective agent zone2, a second protective agent zone4and a hydrolysis zone5is 0.6:1:1, and other parameters and test conditions are the same as those of Embodiment 1.

Embodiment 5

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, a diameter ratio of a first protective agent zone2, a second protective agent zone4and a hydrolysis zone5is 0.9:1:1, and other parameters and test conditions are the same as those of Embodiment 1.

Embodiment 6

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, a height ratio of a first protective agent zone2, a second protective agent zone4and a hydrolysis zone5is 0.4:3:1, and other parameters and test conditions are the same as those of Embodiment 1.

Embodiment 7

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, a height ratio of a first protective agent zone2, a second protective agent zone4and a hydrolysis zone5is 0.8:6:1, and other parameters and test conditions are the same as those of Embodiment 1.

Embodiment 8

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, a volume space velocity of a first protective agent zone2is 1000 h−1, and other parameters and test conditions are the same as Embodiment 1.

Embodiment 9

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, a volume space velocity of a first protective agent zone2is 3800 h−1, and other parameters and test conditions are the same as Embodiment 1.

Embodiment 10

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, a volume space velocity of a second protective agent zone4is 860 h−1, and other parameters and test conditions are the same as Embodiment 1.

Embodiment 11

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, a volume space velocity of a second protective agent zone4is 3100 h−1, and other parameters and test conditions are the same as Embodiment 1.

Embodiment 12

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, a volume space velocity of a hydrolysis zone5is 500 h−1, and other parameters and test conditions are the same as Embodiment 1.

Embodiment 13

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, a volume space velocity of a hydrolysis zone5is 2600 h−1, and other parameters and test conditions are the same as those of Embodiment 1.

Embodiment 14

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, a porosity of a perforated plate is 70%, and other parameters and test conditions are the same as Embodiment 1.

Embodiment 15

This embodiment provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, a porosity of a perforated plate is 78%, and other parameters and test conditions are the same as Embodiment 1.

Comparative Example 1

This comparative example provides a hydrolysis reaction device for dechlorination and decyanation of blast furnace gas. Different from Embodiment 1, there is no functional zone inside the tower body, and other parameters and test conditions are the same as Embodiment 1.

Dechlorination and decyanation efficiency of the hydrolysis reaction devices in the above embodiments and comparative examples are tested. A specific test method includes: analyzing a concentration of COS before and after hydrolysis by gas chromatography, further calculating hydrolysis conversion efficiency, and testing resistance of a tower by a differential pressure sensor. Results are shown in Table 1 below.

TABLE 1Embodiment andHydrolysis conversionComparative exampleefficiency (%)Resistance (kPa)Embodiment 1981Embodiment 2970.8Embodiment 3980.7Embodiment 4961.2Embodiment 5951.5Embodiment 6932Embodiment 7902.1Embodiment 8951.1Embodiment 9901.3Embodiment 10941.2Embodiment 11911.4Embodiment 12931.5Embodiment 13921.5Embodiment 14942Embodiment 15901.5Comparative example 1552.8

As may be seen from Table 1 above:by comparing Embodiment 1 with Embodiments 4 and 5, it may be seen that a hydrolysis conversion rate of the hydrolysis reaction device in Embodiment 1 is higher than hydrolysis conversion rates of the hydrolysis reaction devices in Embodiments 4 and 5, and resistance of the hydrolysis reaction device in Embodiment 1 is lower than resistance of the hydrolysis reaction devices in Embodiments 4 and 5. This is because the disclosure limits the diameter ratio of the first protective agent zone2, the second protective agent zone4, and the hydrolysis zone5to (0.65-0.85):1:1, resulting in a balanced flow field in the tower, low resistance, uniform and stable passage of blast furnace gas through a catalyst layer, and a high catalyst utilization rate.

By comparing Embodiment 1 with Embodiments 6 and 7, it may be seen that the hydrolysis conversion rate of the hydrolysis reaction device in Embodiment 1 is higher than hydrolysis conversion rates of the hydrolysis reaction devices in Embodiments 6 and 7, and the resistance of the hydrolysis reaction device in Embodiment 1 is lower than resistance of the hydrolysis reaction devices in Embodiments 6 and 7. This is because the disclosure limits the height ratio of the first protective agent zone2, the second protective agent zone4, and the hydrolysis zone5to (0.55-0.75):(0.65-1):1, allowing a suitable contact time between the blast furnace gas and the protective agent/catalyst layer of each functional zone without being too long or too short, thus facilitating a full utilization of the catalyst and reducing tower resistance.

By comparing Embodiment 1 with Embodiments 8 and 9, it may be seen that the hydrolysis conversion rate of the hydrolysis reaction device in Embodiment 1 is higher than hydrolysis conversion rates of the hydrolysis reaction devices in Embodiments 8 and 9, and the resistance of the hydrolysis reaction device in Embodiment 1 is lower than resistance of the hydrolysis reaction device in Embodiment 8. This is because the disclosure ensures a chlorine removal effect by limiting the volume space velocity of the first protective agent zone2to 1200-3600 h−1, thereby affecting a subsequent COS hydrolysis conversion rate and system resistance.

By comparing Embodiment 1 with Embodiments 10 and 11, it may be seen that the hydrolysis conversion rate of the hydrolysis reaction device in Embodiment 1 is higher than hydrolysis conversion rates of the hydrolysis reaction devices in Embodiments 10 and 11, and the resistance of the hydrolysis reaction device in Embodiment 1 is lower than resistance of the hydrolysis reaction device in Embodiment 10. This is because the disclosure ensures a decyanation/hydrolysis effect by limiting the volume space velocity of the second protective agent zone4to 870-3000 h−1, thereby affecting the subsequent COS hydrolysis conversion rate and the system resistance.

By comparing Embodiment 1 with Embodiments 12 and 13, it may be seen that the hydrolysis conversion rate of the hydrolysis reaction device in Embodiment 1 is higher than hydrolysis conversion rates of the hydrolysis reaction devices in Embodiments 12 and 13, and the resistance of the hydrolysis reaction device in Embodiment 1 is lower than resistance of the hydrolysis reaction device in Embodiment 12. This is because the disclosure ensures the COS conversion rate and reduces the system resistance by limiting the volume space velocity of the hydrolysis zone5to 550-2500 h−1.

By comparing Embodiment 1 with Embodiments 14 and 15, it may be seen that the hydrolysis conversion rate of the hydrolysis reaction device in Embodiment 1 is higher than hydrolysis conversion rates of the hydrolysis reaction devices in Embodiments 14 and 15, and the resistance of the hydrolysis reaction device in Embodiment 1 is lower than resistance of the hydrolysis reaction devices in in Embodiments 14 and 15. This is because the disclosure limits the porosity of the perforated plate to >80%, resulting in low system resistance, the balanced flow field inside the tower, the uniform and stable passage of blast furnace gas through the catalyst layer, and the high catalyst utilization rate.

By comparing Embodiment 1 with Comparative example 1, it may be seen that the hydrolysis conversion rate of the hydrolysis reaction device in Embodiment 1 is higher than a hydrolysis conversion rate of the hydrolysis reaction device in Comparative example 1, and the resistance of the hydrolysis reaction device in Embodiment 1 is lower than resistance of the hydrolysis reaction device in in Comparative example 1. This is because the disclosure reduces side reactions by setting different functional zones inside the tower body, allowing the hydrolysis reaction to proceed smoothly with minimal interference and improved conversion rate. At the same time, the functional zones may balance the flow field inside the tower and reduce a system pressure loss.

Above are only specific embodiments of the disclosure, but a protection scope of the disclosure is not limited to this. It should be clear to those skilled in the technical field that any change or replacement that may be easily thought of by those skilled in a technical field within a technical scope disclosed by the disclosure falls within the protection scope and a disclosure scope of the disclosure.