Patent ID: 12186700

Reference numerals in the drawings:100filtration adsorption coupling filter;101filter body;102adsorption filtration mechanism;112first fixing mesh;122adsorption filtration layer;132second fixing mesh;200catalytic combustion regeneration box;201box body;202recycling fan;203regeneration mechanism;213electric heating mechanism;223catalytic combustion section;204check valve;205fireproof heat exchange section;300housing;301filter inner cavity;311first inner cavity;321second inner cavity;302air inlet;303air outlet;400control device;401differential pressure detection device;402catalytic temperature detection device;403flue gas temperature detection device; and404alarm device.

DETAILED DESCRIPTION OF THE EMBODIMENTS

To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are some rather than all of the embodiments. Components of the embodiments of the present disclosure generally described and illustrated in the accompanying drawings herein may be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the claimed scope of the present disclosure, but merely represents selected embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

It should be noted that similar reference numerals and letters indicate similar terms in the following accompanying drawings. Therefore, once a certain term is defined in one accompanying drawing, it does not need to be further defined and explained in the subsequent accompanying drawings.

In the description of the present disclosure, it should be noted that orientations or position relationships indicated by terms “center”, “top”, “bottom”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer”, etc. are based on the orientation or position relationships shown in the accompanying drawings, or the orientation or position relationships shown when products of the present disclosure are usually placed in use. The terms are just used to facilitate description of the present disclosure and simplify the description, but not to indicate or imply that the mentioned device or elements must have a specific orientation and must be constructed and operated in a specific orientation. Thus, these terms cannot be understood as a limitation to the present disclosure. Moreover, the terms such as “first”, “second” and “third” are merely used to distinguish expressions and cannot be understood as indicating or implying relative importance.

In addition, the terms such as “horizontal” and “vertical” do not mean that a component is required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, “horizontal” only means that a direction of a structure is more horizontal than “vertical”, and does not mean that the structure must be completely horizontal, but may be slightly inclined.

In the description of the present disclosure, it should also be noted that, unless otherwise specified and defined clearly, the terms “arrange”, “mount”, “connected to”, “connect”, etc. should be understood in a broad sense, for example, the connection may be fixed connection, or detachable connection, or integrated connection; or mechanical connection, or electric connection; or direct connection, or indirect connection through an intermediate medium, or internal communication between two elements. For a person of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present disclosure may be understood according to specific conditions.

It should be noted that in photochemical definition, VOCs refer to organic compounds that participate in photochemical reaction in atmosphere, or organic compounds that are determined through measurement or calculation according to a prescribed method. Generally, VOCs include non-methane hydrocarbons (alkanes, alkenes, alkynes, aromatic hydrocarbons, etc.), oxygen-containing organics (aldehydes, ketones, alcohols, ethers, etc.), chlorine-containing organics, nitrogen-containing organics, sulfur-containing organics, etc. The VOCs are an important precursor for the formation of ozone (O3) and fine particulate matter (PM2.5) pollution. VOCs are the second most widely distributed and species-complex air pollutants next to particulate matter, and have hazards to an ecological environment system and human health mainly in three aspects: first, some species are toxic and carcinogenic, and endanger human health; second, VOCs participate in the photochemical reaction in atmosphere with nitrogen oxides to cause ozone pollution; and third, VOCs form secondary aerosols through chemical reactions, which are an important precursor for forming fine particulate matter (PM2.5). Controlling and reducing emissions of VOCs from various pollution sources is an important way to reduce concentration levels of atmospheric ozone and PM2.5 and improve air quality.

As shown inFIG.1toFIG.6, an integrated device for adsorptive purification and catalytic regeneration of VOCs provided by this embodiment includes: a filtration adsorption coupling filter100, a catalytic combustion regeneration box200and a housing300. The housing300includes a filter inner cavity301and a combustion inner cavity that are communicated in sequence. The housing300is used for closed circulation of VOC exhaust gas. The filtration adsorption coupling filter100is arranged in the filter inner cavity301and used to adsorb and filter the VOC exhaust gas. The catalytic combustion regeneration box200is located in the combustion inner cavity and used to perform thermal desorption and regeneration on the filtration adsorption coupling filter100and catalytically combust and purify the VOC exhaust gas obtained by thermal desorption.

It should be noted that the integrated device for adsorptive purification and catalytic regeneration of VOCs provided in this embodiment is suitable for purification treatment of low-concentration, high-gas-volume, and intermittently-discharged VOC exhaust gas. The integrated device for adsorptive purification and catalytic regeneration of VOCs has two operating conditions which are as follows: the filtration adsorption coupling filter100is utilized to adsorb VOCs; and then the catalytic combustion regeneration box200is utilized to perform thermal desorption and regeneration on the adsorption filtration layer122of the filtration adsorption coupling filter100during an interval when discharge of the exhaust gas is stopped, and catalytically combust and purify the VOC exhaust gas obtained by thermal desorption, which realizes high-density synergistic purification integration of two technologies, and obtains the integrated device for purification and catalytic regeneration.

Optionally, the housing300is used as an accommodating space, where the filter inner cavity301and the combustion inner cavity are used as spaces for storing the filtration adsorption coupling filter100and the catalytic combustion regeneration box200. The VOC exhaust gas is circulated inside the housing300, so that the VOC exhaust gas can be adsorbed by the filtration adsorption coupling filter100. The VOC exhaust gas is thermally catalytically combusted and purified by using the catalytic combustion regeneration box200during the interval when discharge of the exhaust gas is stopped.

In a preferred embodiment of the present disclosure, the filtration adsorption coupling filter100includes a filter body101and an adsorption filtration mechanism102. The adsorption filtration mechanism102is arranged inside the filter body101. The adsorption filtration mechanism102is used to adsorb and filter VOC exhaust gas. The adsorption filtration mechanism102includes a first fixing mesh112, an adsorption filtration layer122and a second fixing mesh132that are sequentially connected. The adsorption filtration layer122is located between the first fixing mesh112and the second fixing mesh132.

The filter body101includes a porous catalytic sleeve. The porous catalytic sleeve is configured into a circular or circular folded structure and has a porosity greater than or equal to 30%. The porous catalytic sleeve has a porosity that is generally not less than 30%.

Optionally, a base material of the porous catalytic sleeve may be made of porous heat-resistant materials such as foam ceramics, honeycomb ceramics, microporous metal honeycomb panels, and glass fibers.

In this embodiment, the first fixing mesh112is an inner fixing mesh for fixing the adsorption filtration mechanism102. The second fixing mesh132and the first fixing mesh112clamp the adsorption filtration mechanism102therebetween. The first fixing mesh112and the second fixing mesh132are provided with through holes, through which the VOC exhaust gas passes so as to be adsorbed by the adsorption filtration mechanism102.

In a preferred embodiment of the present disclosure, the adsorption filtration mechanism102includes an activated carbon filter layer or a molecular sieve filter layer. The activated carbon filter layer includes at least one selected from the group consisting of granular activated carbon, honeycomb activated carbon, hollow columnar activated carbon and activated carbon fiber filter cotton. The molecular sieve filter layer includes at least one selected from the group consisting of a granular molecular sieve, a honeycomb molecular sieve and a hollow cylindrical molecular sieve.

Optionally, the adsorption filtration mechanism102may be provided with multiple filter layers. The filter layers of the multi-layer adsorption filtration mechanism102may be made of different materials, so as to adsorb VOCs more comprehensively.

In a preferred embodiment of the present disclosure, the integrated device for adsorptive purification and catalytic regeneration of VOCs further includes a handle cover plate and an end cover sealing plate that are oppositely arranged. The handle cover plate is located at one end of the filter body101. The end cover sealing plate is located at the other end of the filter body101. The handle cover plate and the end cover sealing plate are separately connected to the filter body101.

The integrated device for adsorptive purification and catalytic regeneration of VOCs provided in this embodiment includes the filtration adsorption coupling filter100, the catalytic combustion regeneration box200and the housing300. The housing300includes the filter inner cavity301and the combustion inner cavity that are communicated in sequence. The housing300is used for closed circulation of VOC exhaust gas. The filtration adsorption coupling filter100is arranged in the filter inner cavity301. The catalytic combustion regeneration box200is arranged in the combustion inner cavity. The VOC exhaust gas is adsorbed and filtered by the filtration adsorption coupling filter100. Moreover, under an operating condition of desorption regeneration, the catalytic combustion regeneration box200is utilized to perform thermal desorption and regeneration on the filtration adsorption coupling filter100, and catalytically combust and purify the VOC exhaust gas obtained by thermal desorption. High-density synergistic purification integration of two technologies is implemented. The integrated device for adsorptive purification and catalytic regeneration of VOCs has technical effects of compact structure, high purification efficiency, recyclability, low secondary pollution, low costs and good economic benefits, and alleviates the following technical problems in the prior art: large volume, difficulty in on-site regeneration technology and high operation and maintenance costs caused by segmented combination or split regeneration technology routes for VOCs prevention and treatment devices.

On the basis of the foregoing described embodiment, further, in a preferred embodiment of the present disclosure, the housing300further includes an air inlet302and an air outlet303. The air inlet302is communicated with the filter inner cavity301. The air inlet302is used to convey received VOC exhaust gas to the filter inner cavity301. The air outlet303is communicated with the combustion inner cavity. The air outlet303is used to discharge a gas that flows through the filtration adsorption coupling filter100and the catalytic combustion regeneration box200so as to be purified.

The inside of the housing300is used as an accommodating space for circulating VOC exhaust gas. The filter inner cavity301for mounting the filtration adsorption coupling filter100and the combustion inner cavity for mounting the catalytic combustion regeneration box200are distinguished. In this embodiment, the filter inner cavity301is distinguished from the combustion inner cavity by distinguishing regions. Moreover, the catalytic combustion regeneration box200is arranged at the air outlet303, and the filtration adsorption coupling filter100is arranged at the air outlet303, so that when entering the housing300, the VOC exhaust gas will be first be adsorbed by the filtration adsorption coupling filter100.

In addition, the positions of the combustion inner cavity and the filter inner cavity301may alternatively be implemented in other ways. For example, the combustion inner cavity is arranged in the middle of the filter inner cavity301, so that the catalytic combustion regeneration box200is able to be located in the middle among multiple filtration adsorption coupling filters100. Thus a high-temperature gas output from the catalytic combustion regeneration box200is used to perform thermal desorption and regeneration on the filtration adsorption coupling filters100.

In a preferred embodiment of the present disclosure, the filter inner cavity301includes a first inner cavity311and a second inner cavity321that are communicated with each other. The housing300includes an air inlet302and an air outlet303. An inlet of the first inner cavity311is communicated with the air inlet302. An outlet of the second inner cavity321is communicated with the air outlet303. The housing300is internally provided with multiple filter mounting holes corresponding to the first inner cavity311. Multiple filtration adsorption coupling filters100are provided, and the filtration adsorption coupling filters100are mounted in the filter mounting holes in a one-to-one correspondence mode, so that VOCs to be purified enter from the air inlet302, pass through the multiple filtration adsorption coupling filters100, then flow through the second inner cavity321and are discharged through the air outlet303.

In this embodiment, to mount the filtration adsorption coupling filters100, the multiple filter mounting holes are formed in the first inner cavity311of the housing300, and filter guide rails are arranged in the filter mounting holes, so that the filtration adsorption coupling filters100are mounted inside the filter mounting holes by using the filter guide rails.

The first inner cavity311is used as the accommodating space for the filter mounting hole, and the other region of the first inner cavity311is the second inner cavity321. The second inner cavity321is communicated with the combustion inner cavity. The second inner cavity321is used to circulate the adsorbed gas after the filtration adsorption coupling filters100in the first inner cavity311adsorb VOC exhaust gas; or the second inner cavity321is used to circulate gases when the catalytic combustion regeneration box200in the combustion inner cavity catalytically combusts and purifies the VOC exhaust gas.

Optionally, a flue gas check valve may be arranged at the air inlet302, and an electric exhaust valve may be arranged at the air outlet303, where the flue gas check valve may be a smoke exhaust fire damper.

In a preferred embodiment of the present disclosure, the catalytic combustion regeneration box200includes a box body201, a recycling fan202and a regeneration mechanism203. The regeneration mechanism203is located in the box body201. A catalyst is arranged in the regeneration mechanism203. The regeneration mechanism203is used to heat the catalyst and VOC exhaust gas, so as to perform thermal desorption and regeneration on the filtration adsorption coupling filter100via the heated VOC exhaust gas, and catalytically combust and decompose the VOC exhaust gas via the heated catalyst. The recycling fan202is located outside the housing300, and the recycling fan202is communicated with the inside of the box body201to convey desorbed VOC exhaust gas into the box body201.

Optionally, the box body201may be made of steel or stainless steel, where the recycling fan202is used for the circulation and conveyance between the box body201and the filtration adsorption coupling filter100.

In a preferred embodiment of the present disclosure, the regeneration mechanism203includes an electric heating mechanism213and a catalytic combustion section223. The electric heating mechanism213and the catalytic combustion section223are arranged in series at an interval. The electric heating mechanism213is used to heat the catalytic combustion section223.

In a preferred embodiment of the present disclosure, the catalytic combustion section223includes multiple catalytic combustion layers. The electric heating mechanism213is arranged between any two catalytic combustion layers. The outside of the catalytic combustion layers is coated with the catalyst.

In this embodiment, the catalytic combustion layer may use foam ceramics and honeycomb ceramics as a carrier, and the carrier is coated with a VOC low-temperature combustion catalyst, where the catalyst may be a VOC catalyst such as a noble metal or transition metal oxide. The working temperature of the catalyst ranges from 200° C. to 400° C. Under the action of the catalyst, the VOCs regenerated and thermally desorbed are decomposed into CO2 and H2O under low temperature conditions of 200° C.-400° C., which can not only purify hydrocarbon exhaust gas, but also remove malodorous odors.

Optionally, the electric heating mechanism213may be an electric heating wire.

In this embodiment, the regeneration mechanism203is used to heat the catalyst and the exhaust gas. The regeneration mechanism203can heat recycling gases when under an operating condition of desorption regeneration, so as to perform thermal desorption on the filtration adsorption coupling filter100by using the hot gases, and can heat the catalyst to make the catalyst reach a catalytic combustion temperature. When VOCs start to combust under the action of the catalyst and can maintain a thermal reaction temperature, the heating is automatically stopped. The thermal desorption temperature is gradually increased by using the combustion heat of the VOCs in the exhaust gas. When the filtration adsorption coupling filter100uses activated carbon as a filter of an adsorbent, the hot gases may be heated to about 100° C., and the maximum temperature of the hot gases does not exceed 120° C. When the filtration adsorption coupling filter100uses a molecular sieve as the filter of the adsorbent, the hot gases may be heated to about 120° C., and the maximum temperature of the hot gases does not exceed 150° C.

In a preferred embodiment of the present disclosure, the integrated device for adsorptive purification and catalytic regeneration of VOCs further includes a check valve204, which is located at an outlet of the box body201, and is used to limit a conveying direction of the catalytic combustion regeneration box200to the filtration adsorption coupling filter100.

Optionally, the check valve204may be a wing valve, and a valve plate of the wing valve may be sealed unidirectionally under the action of gravity and negative pressure, so as to limit a conveying direction of the catalytic combustion regeneration box200to the filtration adsorption coupling filter100.

In a preferred embodiment of the present disclosure, the integrated device for adsorptive purification and catalytic regeneration of VOCs further includes a fireproof heat exchange section205. The fireproof heat exchange section205is located inside the box body201and between the check valve204and the catalytic combustion section223.

Optionally, the fireproof heat exchange section205may be a tubular heat exchange thermal insulation layer.

In this embodiment, when the catalytic combustion regeneration box200is in operation, it is under an operating condition of desorption regeneration. A desorption regeneration cycle is as follows: an outlet of the recycling fan202→the regeneration mechanism203(VOCs purification)→the fireproof heat exchange section205→the check valve204→the filter inner cavity301in the housing300→the filtration adsorption coupling filter100(VOCs desorption)→an inlet of the recycling fan202.

In addition, in a preferred embodiment of the present disclosure, the integrated device for adsorptive purification and catalytic regeneration of VOCs further includes an exhaust fan. The exhaust fan is arranged in the housing300. The exhaust fan can ensure that a VOCs gas to be purified is conveyed in a direction from the air inlet302to the air outlet303along an output direction of the exhaust fan.

In a preferred embodiment of the present disclosure, the integrated device for adsorptive purification and catalytic regeneration of VOCs further includes a control device400, a differential pressure detection device401, a catalytic temperature detection device402, a flue gas temperature detection device403and an alarm device404. The differential pressure detection device401, the catalytic temperature detection device402, the flue gas temperature detection device403and the alarm device404are respectively connected to the control device400via electrical signals. The differential pressure detection device401is arranged in the filter inner cavity301and located at an air outlet end of the filtration adsorption coupling filter100to detect and output a signal on a pressure drop difference in the filter inner cavity301to the control device400. The flue gas temperature detection device403is arranged at an air outlet end of the filter inner cavity301to measure a temperature of the exhaust gas and transmit the information for the temperature of exhaust gas to the control device400. The catalytic temperature detection device402is arranged at an air outlet end of the combustion inner cavity to measure a temperature of the catalyst and transmit information for the temperature of the catalyst to the control device400. The control device400is connected to the catalytic combustion regeneration box200and the alarm device404via electrical signals. The control device400is configured to correspondingly control states of the catalytic combustion regeneration box200and the alarm device404according to the signal on the pressure drop difference in the filter inner cavity301and the information for the temperature of exhaust gas.

In this embodiment, when the exhaust gas temperature is greater than 150° C., the control device400starts the exhaust fan to discharge high-temperature regeneration exhaust gas to prevent the activated carbon catalyst from igniting and avoid fire accidents. The control device400is configured to control a state of the exhaust fan or the alarm device404according to signals respectively output from the differential pressure detection device401, the catalytic temperature detection device402and the flue gas temperature detection device403.

Optionally, multiple types of control devices400may be provided, for example: a MCU, a computer and a PLC, etc. Preferably, the control device400is an MCU. A microcontroller unit (MCU), also known as single-chip microcomputer, is formed by appropriately reducing the frequency and specifications of a central processing unit, and integrating a memory, a counter, a USB, an A/D converter, a UART, a PLC, a DMA and other peripheral interfaces and even an LCD drive circuit on a single chip to form a chip-level computer, to perform different control combinations for different applications.

Preferably, the control device400is an STM32F103C8T6 single-chip microcomputer, which has strong processing capability and abundant internal resources and operates stably.

Optionally, the alarm device404may be an acousto-optic alarm device.

Optionally, the differential pressure detection device may be a differential pressure sensor. Both the catalytic temperature detection device402and the flue gas temperature detection device403each may be a temperature sensor.

In this embodiment, the integrated device for adsorptive purification and catalytic regeneration of VOCs has two operating conditions, which are cycled in a time-sharing manner:Operation condition 1: under an operation condition of adsorptive purification of VOCs, the exhaust fan is normally started, the flue gas check valve in front of the first inner cavity311and the electric exhaust valve at the air outlet303are opened, and purified exhaust gas passes through the air inlet302, the first inner cavity311, the filtration adsorption coupling filter100, the second inner cavity321and the air outlet303and is discharged through the air outlet303.Operating condition 2: in a desorption and catalytic regeneration state, the exhaust fan is shut down or operated at a small gases volume, the flue gas check valve is closed or slightly opened, the electric exhaust valve is slightly opened or closed, the recycling fan202is started, and the electric heating mechanism213is started to preheat gases in the catalytic combustion section223and the box body201, and the regeneration cycle volume may be 5%-20% of the exhaust gases volume. The recycling gases is catalytically combusted and purified, the generated heat heats the gases in the housing300again, and the gases are gradually heated up for desorption, so that VOCs adsorbed by the filtration adsorption coupling filter100are desorbed by using the hot gases. After multiple cycles of purification in the housing300, on-site regeneration is performed on the filtration adsorption coupling filter100, and the desorbed exhaust gas is purified and then discharged.

Finally, it should be noted that the above-mentioned embodiments are only used to illustrate the technical solutions of the present disclosure, rather than constituting a limitation thereto. Although the present disclosure has been described in detail with reference to the above-mentioned embodiments, it should be understood by a person of ordinary skill in the art that he/she may still modify the technical solutions described in the above-mentioned embodiments or equivalently replace some or all technical features therein. These modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of various embodiments of the present disclosure.