Waste gas treatment device and application process thereof

Abstract

The invention discloses a waste gas treatment device and an application process thereof. The waste gas treatment device comprises a pressurized precipitation section, a cryogenic precipitation section, a filler pressurized adsorption section and the like, the pressurized precipitation section is used for pressurizing the waste gas; the cryogenic precipitation section is communicated with the pressurized precipitation section, and the cryogenic precipitation section is used for cooling the waste gas; the filler pressurized adsorption section is used for carrying out pressurized adsorption treatment on the waste gas; and the turbocharging device section is used for reducing the pressure of the gas and recovering energy at the same time so as to pre-compress the waste gas. According to the invention, a waste gas pressurized precipitation process, a waste gas cryogenic precipitation process, a waste gas filler pressurized adsorption process and a reduced pressure emission energy recovery process are simultaneously adopted, so that the treatment working condition of extremely high-concentration organic waste gas can be met and is not limited to the treatment working condition of medium and low-concentration organic waste gas; the waste gas treatment efficiency, the organic matter precipitation efficiency and the filler utilization rate are greatly improved, and the use amount of the filler and the investment operation cost of the whole device are reduced.

Description

[0001] This application claims the priority of the Chinese patent application filed with the China Patent Office on December 31, 2024, with application number 202411997670.5 and patent name “Waste Gas Treatment Device and Its Application Process”, all contents of which are incorporated by reference in the application. Technical Field

[0002] The present invention relates to the technical field of waste gas treatment technology, and in particular to a waste gas treatment device and an application technology thereof. Background Art

[0003] Traditional waste gas treatment processes generally achieve waste gas purification through adsorption and desorption. However, the waste gas concentration of the adsorption process is often limited by the adsorption capacity of the filler (resin, activated carbon, etc.) and the filler loading capacity of the adsorption tower. Since the loading amount or filler volume of the adsorption tower is limited, the adsorption capacity of organic gases in the waste gas is greatly limited. Summary of the invention

[0004] The main purpose of the present invention is to provide a waste gas treatment device and its application process, aiming to improve the waste gas treatment capacity and meet the treatment conditions of low- to medium-concentration and extremely high-concentration organic waste gases.

[0005] To achieve the above-mentioned object, the present invention provides an exhaust gas treatment device, which includes at least one section of a pressurized precipitation section, a cryogenic precipitation section, a filler pressurized adsorption section, and a turbocharger section;

[0006] The pressurized precipitation section has an air inlet end suitable for introducing waste gas, and the pressurized precipitation section is used to perform pressurized treatment on the waste gas so as to convert part of the waste gas into liquid for precipitation;

[0007] The deep cold precipitation section has an air inlet end connected to the air outlet end of the pressurized precipitation section, and the deep cold precipitation section is used to cool the waste gas so as to convert part of the waste gas into liquid for precipitation;

[0008] The filler pressurized adsorption section has an air inlet end connected to the air outlet end of the deep cold precipitation section, and the filler pressurized adsorption section is used to adsorb the waste gas;

[0009] The turbocharger section includes a pressure reducing discharge mechanism and a pre-compression mechanism connected to the pressure reducing discharge mechanism, the air inlet end of the pressure reducing discharge mechanism is connected to the air outlet end of the packing pressurized adsorption section, the air outlet end of the pressure reducing discharge mechanism discharges qualified gas, the air inlet end of the pre-compression mechanism is connected to the air inlet end of the pressurized precipitation section to allow exhaust gas to pass through, and the air outlet end of the pre-compression mechanism is connected to the air inlet end of the packing pressurized adsorption section; the pressure reducing discharge mechanism is used to reduce the pressure of the gas and recover energy during the pressure reducing process, so that the pre-compression mechanism can pre-compress the exhaust gas.

[0010] Optionally, the pressurized precipitation section includes a first gas circuit and a compressor arranged on the first gas circuit, and the compressor is used to compress the exhaust gas to precipitate part of the liquid.

[0011] Optionally, the pressurized precipitation section further comprises:

[0012] a buffer, the buffer being arranged on the first gas path and used for buffering the exhaust gas; and / or

[0013] a filter, the filter being arranged on the first gas path and being used for filtering the exhaust gas; and / or

[0014] A gas-liquid separator, the input end of which is connected to the output end of the compressor and is used to separate gas from liquid.

[0015] Optionally, the cryogenic precipitation section includes a second gas circuit and a cryogenic cooler arranged on the second gas circuit, the input end of the second gas circuit is connected to the output end of the pressurized precipitation section, and the cryogenic cooler is used to cool the exhaust gas to precipitate part of the liquid.

[0016] Optionally, the cryogenic precipitation section further includes a regenerator, the input end of the regenerator is connected to the output end of the cryogenic cooler and is used for performing heat recovery treatment on the exhaust gas.

[0017] Optionally, the cryogenic precipitation section further includes a precooler, which is disposed on the second gas path and is connected to an input end of the cryogenic cooler, and is used to precool the exhaust gas.

[0018] Optionally, the filler pressurized adsorption section includes a third gas circuit and an adsorption device arranged on the third gas circuit, the adsorption device includes one or more filler adsorption devices, the input end of the third gas circuit is connected to the output end of the deep cold precipitation section, the output end of the third gas circuit is connected to the input end of the pressure reducing discharge mechanism of the turbocharger section, and the adsorption device is used to perform pressurized adsorption treatment on the exhaust gas.

[0019] Optionally, the filler pressurized adsorption section further comprises a regeneration and desorption pipeline, which is connected to the adsorption device and is used to introduce a desorbent therein to regenerate and desorb the filler.

[0020] Optionally, the turbocharger section further includes a transmission mechanism, and the pressure reducing and discharging mechanism is connected to the pre-compression mechanism through the transmission mechanism, and the pressure reducing and discharging mechanism is used to drive the pre-compression mechanism to rotate under the action of the recovered gas to pre-compress the introduced exhaust gas.

[0021] To achieve the above object, the present invention further proposes an application process of an exhaust gas treatment device, the application process comprising the following steps:

[0022] S10, waste gas pressurization and precipitation stage, after one or more waste gases are pressurized by the compressor, part of the organic waste gas is converted into liquid and precipitated. After separation by the gas-liquid separator, the precipitated liquid is discharged and condensed and recovered, and the waste gas enters the next stage;

[0023] S20, in the exhaust gas cryogenic precipitation stage, another part of the exhaust gas output from the gas-liquid separator enters the cryogenic precipitation section, and after cooling in the precooler and cryogenic cooler, another part of the organic exhaust gas is converted into liquid for precipitation, and the remaining exhaust gas that has not been precipitated is reheated in the regenerator, and then enters the packing pressurization adsorption section together with the pre-compressed exhaust gas discharged from the pre-compression mechanism of the turbocharger section;

[0024] S30, in the filler pressurized adsorption stage, the exhaust gas after deep cooling and pre-compression enters the adsorption device, and the gas after adsorption is transported to the pressure reducing discharge mechanism of the turbocharger section, driving the pre-compression mechanism to rotate, so as to pre-compress the inlet exhaust gas of the exhaust gas treatment device and transport it to the adsorption device, and the exhaust end of the pressure reducing discharge mechanism discharges the qualified gas directly into the atmosphere or transports it to other devices for reprocessing. After adsorption, the desorbent regenerates and desorbs the filler, and after physical or cooling medium cooling, it is ready for adsorption again.

[0025] In the technical solution of the present invention, the waste gas treatment device includes at least one of a pressurized precipitation section, a cryogenic precipitation section, a filler pressurized adsorption section and a turbocharger section; the pressurized precipitation section is used to perform pressurized treatment on the waste gas so that part of the waste gas is converted into liquid for precipitation; the air inlet end of the cryogenic precipitation section is connected to the air outlet end of the pressurized precipitation section, and the cryogenic precipitation section is used to perform temperature reduction treatment on the waste gas so that part of the waste gas is converted into liquid for precipitation; the air inlet end of the filler pressurized adsorption section is connected to the air outlet end of the cryogenic precipitation section, and the filler pressurized adsorption section is used to perform temperature reduction treatment on the waste gas so that part of the waste gas is converted into liquid for precipitation; The turbocharger section includes a decompression discharge mechanism and a pre-compression mechanism connected to the decompression discharge mechanism. The air inlet of the decompression discharge mechanism is connected to the air outlet of the filler pressurized adsorption section. The exhaust end of the decompression discharge mechanism discharges qualified gas. The air inlet of the pre-compression mechanism is connected to the air inlet of the pressurized precipitation section to pass the waste gas. The air outlet of the pre-compression mechanism is connected to the air inlet of the turbocharger section. The decompression discharge mechanism is used to decompress the gas and recover energy during the decompression process, so as to pre-compress the waste gas with the pre-compression mechanism. It can be understood that the present invention simultaneously adopts the waste gas pressurized precipitation process, the waste gas deep cold precipitation process, the waste gas filler adsorption process and the turbocharger section, which improves the waste gas treatment capacity, is not limited to the treatment conditions of low and medium concentration organic waste gas, and can meet the treatment conditions of extremely high concentration organic waste gas. In addition, the waste gas treatment efficiency, organic matter precipitation efficiency and waste gas utilization rate of the waste gas treatment device are relatively high, which greatly reduces the use and cost of fillers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 A simplified structural diagram of an embodiment of an exhaust gas treatment device of the present invention;

[0028] Figure 2 It is a schematic structural diagram of an embodiment of a waste gas treatment device of the present invention;

[0029] Figure 3 It is a schematic diagram of a process flow of an embodiment of the application process of the waste gas treatment device of the present invention.

[0030] Description of Figure Numbers:

[0031] 10. Pressurized precipitation section; 20. Cryogenic precipitation section; 30. Filler pressurized adsorption section; 40. Turbocharger section; 11. First gas circuit; 12. Compressor; 13. Gas-liquid separator; 21. Second gas circuit; 22. Cryogenic device; 23. Regenerator; 24. Precooler; 411. Pressure reducing discharge mechanism; 412. Pre-compression mechanism; 31. Third gas circuit; 32. Adsorption device.

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] The present invention proposes a waste gas treatment device, which is particularly suitable for use in project conditions with different concentrations, complex gas components and expected large power consumption. It can efficiently precipitate and separate waste gases of various concentrations and can greatly reduce power consumption.

[0038] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the waste gas treatment device includes a pressurized precipitation section 10, a cryogenic precipitation section 20, a filler pressurized adsorption section 30 and a turbocharger section 40; the pressurized precipitation section 10 is used to pressurize the waste gas so that part of the waste gas is converted into liquid for precipitation; the air inlet end of the cryogenic precipitation section 20 is connected to the air outlet end of the pressurized precipitation section 10, and the cryogenic precipitation section 20 is used to cool the waste gas so that part of the waste gas is converted into liquid for precipitation; the air inlet end of the filler pressurized adsorption section 30 is connected to the air outlet end of the cryogenic precipitation section 20, and the filler pressurized adsorption section 30 is used to adsorb the waste gas The turbocharger section 40 includes a pressure reducing discharge mechanism 411 and a pre-compression mechanism 412 connected to the pressure reducing discharge mechanism 411. The air inlet end of the pressure reducing discharge mechanism 411 is connected to the air outlet end of the packing pressurized adsorption section 30. The exhaust end of the pressure reducing discharge mechanism 411 discharges qualified gas. The air inlet end of the pre-compression mechanism 412 is connected to the air inlet end of the pressurized precipitation section 10 to introduce waste gas. The air outlet end of the pre-compression mechanism 412 is connected to the air inlet end of the packing pressurized adsorption section 30. The pressure reducing discharge mechanism 411 is used to reduce the pressure of the gas and recover energy during the pressure reducing process, so that the pre-compression mechanism 412 can pre-compress the waste gas.

[0039] In this embodiment, the pressurized precipitation section 10 may be provided with a plurality of pressurizing devices, which are devices that can pressurize the waste gas and precipitate liquid therefrom.

[0040] In this embodiment, the deep cold precipitation section 20 may be provided with a plurality of refrigeration devices, which are devices that can cool the waste gas and precipitate liquid therefrom.

[0041] like Figure 1 and Figure 2 As shown, the filler pressurized adsorption section 30 of this embodiment can be provided with a plurality of adsorption devices 32, and the adsorption device 32 is a device provided with fillers, and the fillers can adsorb and treat the waste gas.

[0042] It can be understood that the present invention simultaneously adopts the waste gas pressurization precipitation process, the waste gas deep cold precipitation process, the waste gas filler adsorption process and the reduced pressure emission energy recovery process, which improves the waste gas treatment capacity and is not limited to the treatment conditions of low and medium concentration organic waste gas, but can meet the treatment conditions of extremely high concentration organic waste gas. In addition, the waste gas treatment efficiency, organic matter precipitation efficiency and waste gas utilization rate of the waste gas treatment device are relatively high, which greatly reduces the use and cost of fillers.

[0043] In order to further improve the effect and efficiency of exhaust gas treatment, refer to Figure 2 In one embodiment, the pressurized precipitation section 10 may include a first gas circuit 11 and a compressor 12 disposed on the first gas circuit 11, and the compressor 12 is used to compress the exhaust gas to precipitate part of the liquid. In addition, the first gas circuit 11 may also be fed with supplementary liquid to meet the heat dissipation or other needs of the compressor 12 and other devices.

[0044] In this embodiment, the pressurized precipitation section 10 may also include a buffer, a filter, a gas-liquid separator 13 and a condenser; the buffer is arranged on the first gas path 11 and is used to buffer the exhaust gas; the filter is arranged on the first gas path 11 and is used to filter the exhaust gas; the input end of the gas-liquid separator 13 is connected to the output end of the compressor 12 and is used to separate gas and liquid; the input end of the condenser is connected to the liquid outlet end of the gas-liquid separator 13, and the output end of the condenser is used to discharge condensate.

[0045] Traditional waste gas treatment processes often use fans as power devices to purify waste gas through adsorption and desorption. The fan selection is normally larger than the sum of the pressure drops of the equipment and pipelines. The qualified gas at the outlet after adsorption still has a lot of kinetic energy, resulting in a large energy loss.

[0046] In this regard, the present invention also makes relevant improvements to the problem of kinetic energy loss:

[0047] Reference Figure 2 In one embodiment, the cryogenic precipitation section 20 may include a second gas circuit 21 and a cryogenic cooler 22 disposed on the second gas circuit 21. The input end of the second gas circuit 21 is connected to the output end of the first gas circuit 11. The cryogenic cooler 22 is used to cool the exhaust gas to precipitate some liquid.

[0048] In this embodiment, the cryogenic precipitation section 20 further includes a regenerator 23; the input end of the regenerator 23 is connected to the output end of the cryogenic cooler 22 and is used for performing heat recovery treatment on the waste gas.

[0049] The reheating temperature of the reheater 23 can be set to 0-10°C, and the outlet pressure of the reheater 23 can be set to 0.5-0.8Mpa, which is not limited here. The reheating temperature of the reheater 23 can be determined according to the optimal adsorption temperature of the filler, and the outlet pressure can be determined according to the different optimal pressurized gas saturation concentrations of the system.

[0050] Reference Figure 2 In one embodiment, the cryogenic precipitation section 20 may further include a precooler 24, which is disposed on the second gas path 21 and connected to the input end of the cryogenic cooler 22, and is used to precool the exhaust gas.

[0051] In this embodiment, there is no limit to the number of precoolers 24 and cryogenic freezers 22. The cryogenic freezer 22 can be connected to a refrigeration unit, which provides it with heat exchange media such as ethylene glycol or other refrigerants. The outlet temperature of the refrigeration unit can be set to -20°C (according to actual working conditions), and its inlet temperature can be set to -15°C (according to actual working conditions) so that the cryogenic freezer 22 can achieve a better cooling effect.

[0052] Reference Figure 2 In one embodiment, the filler pressurization adsorption section 30 includes a third gas circuit 31 and an adsorption device 32 arranged on the third gas circuit 31. The input end of the third gas circuit 31 is connected to the output end of the second gas circuit 21, and the output end of the third gas circuit 31 is connected to the input end of the turbocharger section 40. The adsorption device 32 is used to adsorb the exhaust gas.

[0053] In this embodiment, the turbocharger section 40 includes a decompression discharge mechanism 411, a transmission mechanism and a pre-compression mechanism 412. The decompression discharge mechanism 411 is connected to the pre-compression mechanism 412 through a transmission mechanism. The input end of the decompression discharge mechanism 411 is connected to the gas outlet end of the packing pressurized adsorption section 30. The exhaust end of the decompression discharge mechanism 411 directly discharges the qualified gas into the atmosphere or transports it to other devices for reprocessing. The output end of the pre-compression mechanism 412 is connected to the gas inlet end of the packing pressurized adsorption section 30. The decompression discharge mechanism 411 is used to drive the pre-compression mechanism 412 to rotate through the transmission mechanism under the action of the recovered gas to pre-compress the introduced waste gas. In this way, not only the decompression discharge of qualified gas is achieved, but also the adsorption effect and efficiency of the waste adsorption device 32 can be improved by pressurizing the waste gas.

[0054] In this embodiment, the pre-compression mechanism 412 is used for pre-compression of the exhaust gas, and the pressure is 50-100 Kpa (according to the actual working conditions), and the pre-compressed exhaust gas can be directly subjected to pressurized adsorption treatment. In this way, the energy utilization rate and the exhaust gas treatment capacity of the exhaust gas treatment system can be further improved.

[0055] In this embodiment, the packing pressurized adsorption section 30 may also include a regeneration and desorption pipeline, a cooling pipeline and a separation device; the regeneration and desorption pipeline is connected to the adsorption device 32 and is used to introduce steam or other desorbents to regenerate and desorb the packing; the cooling pipeline may include a circulation input pipe and a circulation output pipe, the circulation input pipe is connected to the liquid inlet of the adsorption device 32 and is used to input water or other cooling media thereto, and the circulation output pipe is connected to the liquid outlet of the adsorption device 32 or the third gas path 31 and is used to output the cooling medium; the separation device is arranged on the pipeline between the adsorption device 32 and the circulation output pipe and is used to stratify the liquid to form wastewater and usable water. Preferably, three adsorption devices 32 can be set to carry out the process of cyclic adsorption and desorption. The usable water outlet of the separation device can be connected to the condensate recovery tank to improve the utilization rate of the circulating water.

[0056] In traditional waste gas treatment technology, for high-concentration waste gas, if adsorption is to be performed, the volume of the packing must be increased, which means adding an adsorption tower or increasing the volume of the equipment, resulting in a large footprint of the entire system, bulky equipment, and a bloated overall design. However, in the present invention, since the waste gas pressurization precipitation process, the waste gas deep cold precipitation process, and the waste gas packing adsorption process are simultaneously adopted, the treatment conditions of low-concentration and extremely high-concentration organic waste gas can be met, and the waste gas treatment capacity is greatly improved. There is no need to increase the volume of the packing, which helps to reduce the volume of the packing pressurization adsorption section 30, and the equipment is lighter and the structure is more compact, which is conducive to saving space costs.

[0057] Reference Figure 2 In one embodiment, the packing pressurized adsorption section 30 may further include a pressure reducing valve, which is arranged on the third gas path 31 and connected to the input end of the adsorption device 32. The pressure reducing valve is used to reduce the pressure of the waste gas; the outlet pressure of the pressure reducing valve is 0-15Kpa. In this way, the pressure of the waste gas entering the adsorption device 32 can be kept at an appropriate level to ensure the adsorption effect and efficiency.

[0058] Combination Figures 1 to 3 The present invention also proposes an application process of an exhaust gas treatment device. Based on the above-mentioned exhaust gas treatment device, the application process includes the following steps:

[0059] S10, waste gas pressurization and precipitation stage, after one or more waste gases are pressurized by the compressor, part of the organic waste gas is converted into liquid and precipitated. After separation by the gas-liquid separator, the precipitated liquid is discharged and condensed and recovered, and the waste gas enters the next stage;

[0060] S20, in the exhaust gas cryogenic precipitation stage, another part of the exhaust gas output from the gas-liquid separator enters the cryogenic precipitation section, and after cooling in the precooler and cryogenic cooler, another part of the organic exhaust gas is converted into liquid for precipitation, and the remaining exhaust gas that has not been precipitated is reheated in the regenerator, and then enters the packing pressurization adsorption section together with the pre-compressed exhaust gas discharged from the pre-compression mechanism of the turbocharger section;

[0061] S30, in the filler pressurized adsorption stage, the exhaust gas after deep cooling and pre-compression enters the adsorption device, and the gas after adsorption is transported to the pressure reducing discharge mechanism of the turbocharger section, driving the pre-compression mechanism to rotate, so as to pre-compress the inlet exhaust gas of the exhaust gas treatment device and transport it to the adsorption device, and the exhaust end of the pressure reducing discharge mechanism discharges the qualified gas directly into the atmosphere or transports it to other devices for reprocessing. After adsorption, the desorbent regenerates and desorbs the filler, and after physical or cooling medium cooling, it is ready for adsorption again.

[0062] That is to say, during the exhaust gas treatment, the exhaust gas treatment system of the present invention is roughly divided into the following three stages:

[0063] In the first stage, i.e., the waste gas pressurization and precipitation stage, one or more waste gases are collected in a buffer tank, and then enter the compressor 12 through a filter. The compressor 12 provides power. After the waste gas is pressurized by the compressor 12, part of the organic waste gas is converted into liquid and precipitated. After separation by the gas-liquid separator, it enters the condensate recovery tank.

[0064] In the second stage, i.e. the waste gas deep cooling precipitation stage, another part of the waste gas output from the gas-liquid separator enters the deep cooling section. After being cooled by the precooler 24 and the deep cooler 22, a part of the organic waste gas will be converted into liquid and precipitated. The remaining waste gas that has not been precipitated will be reheated to 0-10 degrees Celsius through the regenerator 23. At this time, the outlet pressure of the regenerator 23 is 0.5-0.8Mpa. After deep cooling, the waste gas enters the packing pressurized adsorption section 30.

[0065] In the third stage, i.e., the filler pressurized adsorption stage, the exhaust gas after deep cooling and pre-compression enters the adsorption device 32, and the adsorbed gas is transported to the pressure reducing discharge mechanism 411 of the turbocharger section 40, driving the pre-compression mechanism 412 to rotate, so as to pre-compress the inlet exhaust gas of the exhaust gas treatment device and transport it to the adsorption device 32, and the exhaust end of the pressure reducing discharge mechanism 411 discharges the qualified gas directly into the atmosphere or transports it to other devices for reprocessing. After adsorption, steam or active agent regenerates and desorbs the filler, and after physical cooling or cooling by cooling medium, it is ready for adsorption again.

[0066] It is worth mentioning that the combined use of the waste gas cryogenic precipitation process and the waste gas filler adsorption process has been applied in two of our projects, namely, an ethyl acetate waste gas treatment project in a certain place and a chlorine-containing waste gas treatment project of a certain company, and has achieved good results and social impact. The combined use of the four processes of waste gas pressurization precipitation process, waste gas cryogenic precipitation process, waste gas filler adsorption process and turbocharger section will be implemented in a dichloromethane waste gas treatment project of a certain company, and is currently in the construction stage.

[0067] The technical solution of the present invention has at least the following beneficial effects:

[0068] (1) The present invention simultaneously adopts the waste gas pressurization precipitation process, the waste gas deep cold precipitation process, the waste gas filler adsorption process and the turbocharging process, which improves the effectiveness and adaptability of treating waste gases of different concentrations and can meet the treatment conditions of extremely high concentration organic waste gases; it is not limited to the treatment conditions of medium and low concentration organic waste gases.

[0069] (2) The kinetic energy of the adsorbed gas is recovered through the turbocharger section 40, and the inlet exhaust gas is pre-compressed. On the one hand, the power consumption of the compressor 12 is reduced, and on the other hand, the exhaust gas is compressed, so that the exhaust gas concentration per unit volume is increased, thereby improving the exhaust gas treatment efficiency of the entire system. In addition, energy recovery can greatly reduce the system power consumption.

[0070] (3) Since four waste gas treatment processes are adopted and the waste gas is pre-compressed and transported to the packing pressurized adsorption section 30 through energy recovery, the use and cost of the packing are greatly reduced, and the adsorption efficiency of the same volume of packing is also improved (this is because the waste gas concentration increases after pre-compression; for example: the original 2 cubic meters of waste gas and the compressed 1 cubic meter of waste gas contain the same amount of organic matter, so the same volume of packing originally takes 2 hours to complete the adsorption, but only takes 1 hour to complete the adsorption by using the waste gas treatment device and enters the desorption stage, thereby improving the waste gas treatment efficiency).

[0071] (4) The present invention increases the pressure by the compressor 12, which helps to improve the precipitation efficiency of the waste gas pressurization precipitation section 10 and the deep cold precipitation section 20 equipment, and more organic matter is precipitated per unit time.

[0072] In summary, the waste gas adsorption device 32 and its adsorption process proposed in the present invention are suitable for waste gas conditions of different concentrations. First, it can effectively solve the adsorption problem of high-concentration waste gas, convert high-concentration waste gas into low-concentration waste gas, and reduce the resin loading amount and equipment volume; second, the kinetic energy of qualified gas outlet can be recovered to reduce energy loss; third, by recycling energy, the gas is pre-compressed, the concentration of waste gas per unit volume is increased, and the one-time adsorption efficiency of the resin is greatly improved.

[0073] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An exhaust gas treatment device, characterized in that: The exhaust gas treatment device includes at least one of a pressurized precipitation section, a cryogenic precipitation section, a filler pressurized adsorption section, and a turbocharger section; The pressurized precipitation section has an air inlet end suitable for introducing waste gas, and the pressurized precipitation section is used to perform pressurized treatment on the waste gas so as to convert part of the waste gas into liquid for precipitation; The deep cold precipitation section has an air inlet end connected to the air outlet end of the pressurized precipitation section, and the deep cold precipitation section is used to cool the waste gas so as to convert part of the waste gas into liquid for precipitation; The filler pressurized adsorption section has an air inlet end connected to the air outlet end of the deep cold precipitation section, and the filler pressurized adsorption section is used to adsorb the waste gas; The turbocharger section includes a pressure reducing discharge mechanism and a pre-compression mechanism connected to the pressure reducing discharge mechanism, the air inlet end of the pressure reducing discharge mechanism is connected to the air outlet end of the packing pressurized adsorption section, the air outlet end of the pressure reducing discharge mechanism discharges qualified gas, the air inlet end of the pre-compression mechanism is connected to the air inlet end of the pressurized precipitation section to allow exhaust gas to pass through, and the air outlet end of the pre-compression mechanism is connected to the air inlet end of the packing pressurized adsorption section; the pressure reducing discharge mechanism is used to reduce the pressure of the gas and recover energy during the pressure reducing process, so that the pre-compression mechanism can pre-compress the exhaust gas.

2. The exhaust gas treatment device according to claim 1, characterized in that: The pressurized precipitation section includes a first gas path and a compressor disposed on the first gas path, and the compressor is used to compress the waste gas to precipitate part of the liquid.

3. The exhaust gas treatment device according to claim 2, characterized in that: The pressurized precipitation section also includes: a buffer, the buffer being arranged on the first gas path and used for buffering the exhaust gas; and / or a filter, the filter being arranged on the first gas path and being used for filtering the exhaust gas; and / or A gas-liquid separator, the input end of which is connected to the output end of the compressor and is used to separate gas from liquid.

4. The exhaust gas treatment device according to claim 1 or 2, characterized in that: The cryogenic precipitation section includes a second gas circuit and a cryogenic cooler arranged on the second gas circuit. The input end of the second gas circuit is connected to the output end of the pressurized precipitation section. The cryogenic cooler is used to cool the exhaust gas to precipitate some liquid.

5. The exhaust gas treatment device according to claim 4, characterized in that: The cryogenic precipitation section further comprises a regenerator, the input end of which is connected to the output end of the cryogenic cooler and is used for performing heat recovery treatment on the waste gas.

6. The exhaust gas treatment device according to claim 5, characterized in that: The deep cooling precipitation section also includes a precooler, which is arranged on the second gas path and communicated with the input end of the deep cooling device, and is used for precooling the exhaust gas.

7. The exhaust gas treatment device according to claim 1, characterized in that: The packing pressurized adsorption section includes a third gas circuit and an adsorption device arranged on the third gas circuit, the adsorption device includes one or more packing adsorption devices, the input end of the third gas circuit is connected to the output end of the deep cold precipitation section, the output end of the third gas circuit is connected to the input end of the pressure reducing discharge mechanism of the turbocharger section, and the adsorption device is used to perform pressurized adsorption treatment on the exhaust gas.

8. The exhaust gas treatment device according to claim 7, characterized in that: The packing pressurized adsorption section also includes a regeneration and desorption pipeline, which is connected to the adsorption device and is used to introduce a desorbent therein to regenerate and desorb the packing.

9. The exhaust gas treatment device according to claim 1, characterized in that: The turbocharger section also includes a transmission mechanism, through which the pressure reducing and discharging mechanism is connected to the pre-compression mechanism, and the pressure reducing and discharging mechanism is used to drive the pre-compression mechanism to rotate under the action of the recovered gas to pre-compress the introduced exhaust gas.

10. An application process of a waste gas treatment device, characterized in that: The application process comprises the following steps: S10, waste gas pressurization and precipitation stage, after one or more waste gases are pressurized by the compressor, part of the organic waste gas is converted into liquid and precipitated. After separation by the gas-liquid separator, the precipitated liquid is discharged and condensed and recovered, and the waste gas enters the next stage; S20, in the exhaust gas cryogenic precipitation stage, another part of the exhaust gas output from the gas-liquid separator enters the cryogenic precipitation section, and after cooling in the precooler and cryogenic cooler, another part of the organic exhaust gas is converted into liquid for precipitation, and the remaining exhaust gas that has not been precipitated is reheated in the regenerator, and then enters the packing pressurization adsorption section together with the pre-compressed exhaust gas discharged from the pre-compression mechanism of the turbocharger section; S30, in the filler pressurized adsorption stage, the exhaust gas after deep cooling and pre-compression enters the adsorption device, and the gas after adsorption is transported to the pressure reducing discharge mechanism of the turbocharger section, driving the pre-compression mechanism to rotate, so as to pre-compress the inlet exhaust gas of the exhaust gas treatment device and transport it to the adsorption device, and the exhaust end of the pressure reducing discharge mechanism discharges the qualified gas directly into the atmosphere or transports it to other devices for reprocessing. After adsorption, the desorbent regenerates and desorbs the filler, and after physical or cooling medium cooling, it is ready for adsorption again.

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