Composite tail gas treatment system

Abstract

The utility model provides a composite tail gas treatment system which comprises a first cooling device, an acid treatment device and a second cooling device which are sequentially connected according to the tail gas flowing direction, the first cooling device comprises two or more first sub-cooling devices which are connected in series and is used for carrying out first cooling treatment on tail gas, and the second cooling device comprises two or more second sub-cooling devices which are connected in series; the catalyst is used for removing part of amine components in the tail gas; the second cooling device comprises one or more second sub-cooling devices, and is used for carrying out second cooling treatment on the tail gas subjected to acid treatment and removing part of residual organic matter components in the tail gas. The first cooling device and the second cooling device are arranged in front of and behind the acid treatment device, and the tail gas is cooled twice before and after acid treatment, so that peculiar smell substances in the tail gas can be more thoroughly removed, the subsequent adsorption process is more efficient, the efficiency of the whole tail gas treatment system is improved, and the service life of the tail gas treatment system is prolonged. And the treated tail gas has no obvious peculiar smell.

Description

Technical Field

[0001] The utility model belongs to the technical field of tail gas treatment, and specifically relates to a composite tail gas treatment system. Background Art

[0002] During the fuel combustion and production process in the factory area of ​​the enterprise, various exhaust gases containing organic gases are generated, even containing odorous or toxic organic gases. This exhaust gas directly discharged into the external environment will pollute the atmospheric environment and have a bad impact on the air quality of the surrounding area. In order to treat the exhaust gas to a certain extent so that it can meet the corresponding emission standards, an exhaust gas treatment system is required.

[0003] The exhaust gas treatment system is an environmental protection equipment that recycles or removes and reduces harmful components in exhaust gas through different process technologies, thereby protecting the environment and purifying the air.

[0004] The defect of the existing exhaust gas treatment system is that the odorous exhaust gas components are not treated thoroughly, and organic matter such as aniline and trimethylamine are still not completely removed, which makes the emission area have an odor. In addition, the terminal exhaust gas carries a lot of moisture, which will affect the detection results of the exhaust gas detection device and damage the corresponding treatment components. The moisture in the exhaust gas will flow along the inner wall of the chimney to the bottom of the chimney to accumulate or flow to the ground outside the chimney, polluting the environment. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a composite exhaust gas treatment system to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] By combining the acid treatment of the exhaust gas with two cooling steps before and after the acid treatment, the odor components in the exhaust gas can be completely removed, solving the odor problem in the emission area and making the exhaust gas emissions more environmentally friendly.

[0008] On the one hand, the utility model provides a composite tail gas treatment system, including a first cooling device, an acid treatment device and a second cooling device connected in sequence according to the tail gas flow direction:

[0009] Wherein, the first cooling device comprises two or more first sub-cooling devices connected in series, which are configured to perform a first cooling treatment on the tail gas to remove part of the amine components in the tail gas;

[0010] The second cooling device includes at least one second sub-cooling device, which is configured to perform a second cooling treatment on the tail gas that has been treated with acid, so as to remove residual organic components in the tail gas.

[0011] Preferably, the composite tail gas treatment system further comprises a separation device and an adsorption device;

[0012] The separation device is configured to perform gas-liquid separation on the tail gas that has undergone the second cooling treatment;

[0013] The adsorption device is configured to adsorb volatile organic compounds in the tail gas that has undergone gas-liquid separation.

[0014] Preferably, the first cooling device comprises two or more condensers connected in series, and the last condenser is connected to the acid treatment device.

[0015] Preferably, the acid treatment device comprises three or more acid treatment devices connected in series.

[0016] Preferably, the acid treatment device comprises a primary pickling tower, a secondary pickling tower and a tertiary pickling tower connected in series, and the primary pickling tower, the secondary pickling tower and the tertiary pickling tower are respectively provided with three groups of packing layers and sprayers to remove the second part of the amine components in the tail gas.

[0017] Preferably, the first-stage pickling tower, the second-stage pickling tower and the third-stage pickling tower are sequentially provided with an upper acid liquid sprayer, an upper tower plate structured packing, a middle acid liquid sprayer, a middle tower plate structured packing, a lower acid liquid sprayer and a lower tower plate structured packing from top to bottom.

[0018] Preferably, the adsorption device comprises two or more sub-adsorption devices connected in series.

[0019] Through the above technical scheme, the composite exhaust gas treatment system of the utility model can more effectively and to a greater extent remove amine components and other odor components in the exhaust gas in multiple exhaust gas treatment steps through the first cooling treatment, acid treatment and second cooling treatment performed in sequence, thereby improving the efficiency of the entire exhaust gas treatment system, and making the exhausted exhaust have no obvious odor (that is, no odor that can be smelled by the human body), and the emission concentration of the amine components at the outlet is zero. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0021] Figure 1 It is a schematic diagram of the process flow of the composite tail gas treatment system according to the utility model.

[0022] In the figure:

[0023] 1-primary condenser, 2-secondary condenser, 3-first circulation pump, 4-primary pickling tower, 5-second circulation pump, 6-secondary pickling tower, 7-third circulation pump, 8-third-stage pickling tower, 9-surface cooler, 10-gas-liquid separator, 11-induced draft fan, 12-primary adsorption box, 13-secondary adsorption box, 14-chimney. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0025] The tail gas to be treated by the utility model mainly includes trimethylamine, aniline, methanol and nitrobenzene, among which trimethylamine is the main odor substance in the tail gas. Conventional condensation and pickling steps are difficult to completely remove trimethylamine, aniline, methanol and other odorous gases, and odor is always generated within the factory area.

[0026] Composite exhaust gas treatment system

[0027] The utility model provides a composite tail gas treatment system, which mainly comprises a first cooling device, an acid treatment device and a second cooling device which are sequentially connected according to the tail gas flow direction.

[0028] The first cooling device comprises at least two first sub-cooling devices connected in series, and is configured to perform a first cooling treatment on the tail gas, so as to remove a first part of the amine components in the tail gas.

[0029] The second cooling device includes at least one second sub-cooling device, which is configured to perform a second cooling treatment on the tail gas that has been treated with acid, so as to remove residual organic components in the tail gas.

[0030] The tail gas treatment system of the utility model allows the tail gas to first pass through a first cooling device, and perform a first cooling treatment on the tail gas, that is, deep condensation, to reduce the tail gas temperature, so that the organic matter in the tail gas is cooled and condensed into a liquid for separation, thereby removing the trimethylamine in the tail gas; the tail gas after the first cooling treatment enters an acid treatment device, so that the tail gas undergoes mass transfer, exchange and acid-base neutralization reaction in the acid treatment device, and most of the organic volatile substances in the tail gas, such as amine substances, are removed in this step; then the tail gas discharged from the acid treatment device is passed into a second cooling device, so that it undergoes a second cooling treatment, and the residual organic components in the tail gas are removed.

[0031] In the above, it should be understood that the tail gas treated by the technical solution of the present application mainly includes trimethylamine, aniline and nitrobenzene, for example, it can be vacuum tail gas, storage tank release gas and / or synthesis process tail gas.

[0032] In one embodiment, the exhaust gas treatment system of the present invention further includes a separation device and an adsorption device.

[0033] The separation device is configured to perform gas-liquid separation on the tail gas that has undergone the second cooling treatment;

[0034] The adsorption device is configured to adsorb volatile organic compounds in the tail gas that has undergone gas-liquid separation.

[0035] The tail gas treatment system of the utility model passes the tail gas after the second cooling treatment into the separation device to remove the moisture in the tail gas, and passes the tail gas passing through the separation device into the adsorption device to adsorb the residual volatile organic matter in the tail gas through the adsorbent.

[0036] In one embodiment, if Figure 1 As shown, the first cooling device includes two or more first sub-cooling devices connected in series, for example, two or more condensers connected in series, for deep condensation of the tail gas, wherein the last sub-cooling device is used to communicate with the downstream acid treatment device. According to a specific embodiment, the first cooling device may include, for example, a primary condenser 1 and a secondary condenser 2 connected in series, and the secondary condenser 2 is connected to the downstream acid treatment device.

[0037] In the exhaust gas treatment system of the utility model, two or more first sub-cooling devices arranged in series, such as the first-stage condenser 1 and the second-stage condenser 2 connected in series, can transfer heat between the exhaust gas and the cooling medium in the tubes of the heat exchanger, so that when the exhaust gas temperature drops below the dew point temperature of certain gas components, these gas components in the exhaust gas condense. Specifically, in the utility model, after being treated by the first cooling device, part of the trimethylamine in the exhaust gas is removed, and part of the water in the exhaust gas is removed, thereby reducing the burden of the subsequent acid treatment step.

[0038] According to one embodiment, the cooling device used in the utility model may be a cryogenic refrigerator, which may include a heat exchanger, a condensation zone, and a liquid collection zone. The tail gas enters from the gas inlet on one side of the upper part of the liquid collection zone and flows upward into the condensation zone. The condensation zone is provided with a tube of a heat exchanger, and a cooling medium, such as cold water, is passed through the tube. The cooling medium enters from the medium inlet at the top of the tube and leaves from the medium outlet at the bottom of the tube. Thus, in the condensation zone, the direction of the tail gas flow is opposite to that of the cooling medium. The tail gas is cooled through heat exchange between the tail gas and the cooling medium. The cooled tail gas leaves from the tail gas outlet at the top of the condensation zone and flows into the gas inlet of the next series-connected cryogenic refrigerator, or flows into the gas inlet of the downstream acid treatment device. The condensed liquid flows out from the liquid outlet at the bottom of the liquid collection zone to the post-processing device, such as flowing to the incinerator for incineration.

[0039] Specifically, in the cooling step, some volatile organic components in the tail gas, such as trimethylamine, aniline and methanol, condense into droplets, and are separated from the gas phase. This step can remove some trimethylamine components and water in the tail gas, and it can more effectively and thoroughly separate the condensable part in the tail gas, so that the condenser can achieve a high recovery rate at a lower temperature and pressure.

[0040] In some embodiments, Figure 1 As shown, the acid treatment device may include at least three sub-acid treatment devices connected in series, and the tail gas after the first cooling treatment enters from the lower gas inlet of the first sub-acid treatment device and flows out from the top gas outlet to the lower gas inlet of the next sub-acid treatment device. The tail gas after the acid treatment flowing out from the top gas outlet of the last sub-acid treatment device flows to the gas inlet of the second cooling device downstream.

[0041] In a specific embodiment of the present invention, Figure 1 As shown, the acid treatment device includes a primary pickling tower 4, a secondary pickling tower 6 and a tertiary pickling tower 8 connected in series. Preferably, a first circulation pump 3 is provided before the primary pickling tower 4, a second circulation pump 5 is provided before the secondary pickling tower 6, and a third circulation pump 7 is provided before the tertiary pickling tower 8.

[0042] Specifically, the acid solution (also called absorption liquid) is transported from an external supply source to the bottom of the primary pickling tower 4, the secondary pickling tower 6 and the tertiary pickling tower 8. The first circulation pump 3, the second circulation pump 5 and the third circulation pump 7 respectively pump the acid solution from the bottom of the primary pickling tower 4, the secondary pickling tower 6 and the tertiary pickling tower 8 to the upper part of the pickling tower, and then sprayed by the sprayer for tail gas acid treatment. After the acid solution fails, it is transported to the wastewater tank for treatment, and the acid solution is replenished to each pickling tower independently.

[0043] The tail gas treatment system of the utility model circulates the acid solution in each level of pickling tower through the cooperation of multiple groups of circulating pumps and sub-acid treatment devices, ensuring that the acid solution can continue to effectively contact and neutralize the amine components in the tail gas, such as trimethylamine and aniline, so that most of the amine components in the tail gas can be removed.

[0044] In a specific embodiment, Figure 1 As shown, three groups of packing layers and sprayers are respectively arranged in the first pickling tower 4, the second pickling tower 6, and the third pickling tower 8 to remove most of the amine components in the tail gas, such as trimethylamine and aniline. The utility model can effectively contact the tail gas by evenly spraying the acid solution in the pickling tower, thereby fully neutralizing the amine components therein and improving the removal degree of the amine components.

[0045] According to one embodiment, each packing layer may adopt structured packing. The utility model can help the acid liquid sprayed by the sprayer to be evenly distributed in the entire packing layer by selecting structured packing with uniform arrangement, which is beneficial to the contact between a large amount of exhaust gas and acid liquid, and improves the exhaust gas treatment capacity while having a higher mass transfer efficiency. It can effectively absorb the removed gas components from the gas phase into the liquid phase, and the pressure drop of the structured packing is small, which will not produce excessive resistance to the operation of the system.

[0046] The acid treatment device of the utility model can use fillers with good corrosion resistance, high mass transfer efficiency and high mechanical strength. Preferably, the structured fillers can be corrugated structured fillers or metal wire mesh structured fillers.

[0047] In the utility model, the interiors of the primary pickling tower 4, the secondary pickling tower 6 and the tertiary pickling tower 8 are sequentially provided with an upper acid liquid sprayer and an upper tray structured packing, a middle acid liquid sprayer and a middle tray structured packing, and a lower acid liquid sprayer and a lower tray structured packing from top to bottom.

[0048] The tail gas after the first cooling treatment enters the acid treatment device (such as a pickling tower). During the rising process, the tail gas passes through the lower tower plate structured packing and the lower acid liquid sprayer, the middle tower plate structured packing and the middle acid liquid sprayer, the upper tower plate structured packing and the upper acid liquid sprayer in turn for mass transfer, exchange and acid-base neutralization reaction. Most of the trimethylamine and aniline are neutralized and removed through the three sub-acid treatment devices.

[0049] The utility model can make the liquid more evenly distributed in the tower through the three-layer spraying arrangement, increase the contact area between gas and liquid, and increase the number of spraying layers to reduce the amount of spraying liquid in each layer, thereby reducing the obstruction of single-layer spraying to airflow, so that the exhaust gas can pass through the packing layer more evenly. The three-layer packing arrangement can provide a large amount of gas-liquid contact surface for the device, so that the organic matter in the exhaust gas can be effectively transferred to the liquid phase.

[0050] In some embodiments, the pressure drop in the acid washing tower can be controlled by properly designing the number of spray layers and the thickness of the packing layer.

[0051] Preferably, three spray layers are selected, and the packing layer thickness can be 0.3-0.7 m, preferably 0.4 m, to effectively control the pressure drop in the pickling tower.

[0052] The acid solution used in the above-mentioned acid treatment device may be an oxalic acid solution. The pH value of the acid solution used in the present disclosure is below 1. When the pH value of the acid solution exceeds 5, the ineffective acid solution in the pickling tower is discharged and the acid solution is replenished. Oxalic acid can react with amine components in the tail gas, such as trimethylamine and aniline, to form relatively stable salts, thereby removing them from the tail gas.

[0053] In the present invention, the second cooling device is a surface cooler 9, and the acid-treated exhaust gas is introduced into the surface cooler 9. At this time, the exhaust gas contains a large amount of water vapor and other volatile organic compounds (VOCs). The surface cooler reduces the exhaust gas temperature to below the dew point of these components, condenses them into liquid, and separates them from the air flow. The cooling device can effectively reduce the exhaust gas temperature, condense and remove moisture and condensable gases. The condensed liquid is discharged from the bottom of the surface cooler to a wastewater tank for treatment (not shown).

[0054] The lower temperature of the tail gas after cooling helps improve the adsorption efficiency of the adsorption material, because lower temperatures generally enhance the adsorption process. Condensation removes some water vapor and condensable gases, reducing the total volume of the tail gas. This not only helps to reduce the emission load of the tail gas, but also reduces the size and processing capacity requirements of the subsequent treatment adsorption device. The reduction in tail gas temperature can also reduce the risk of corrosion of the equipment, thereby extending the service life of the equipment. By condensing and removing moisture and pollutants in the tail gas, it can better ensure that the exhaust gas meets environmental regulations and emission standards.

[0055] In the present invention, the separation device can be a gas-liquid separator 10. The gas separated by the gas-liquid separator 10 is passed into a subsequent adsorption device, and the separated liquid is discharged from the bottom of the separator to a wastewater tank for treatment (not shown).

[0056] Preferably, the separation device can be a centrifugal separator. The utility model selects a centrifugal separator, and due to the effect of centrifugal force, the separation of liquid and gas is faster and more thorough, and under certain operating conditions, the centrifugal separator can operate stably, and its separation effect is not affected by flow velocity fluctuations.

[0057] In the present utility model, if Figure 1 As shown, an induced draft fan 11 can be provided between the separation device and the adsorption device to introduce the tail gas separated from the gas-liquid separator into the adsorption device. The induced draft fan 11 can increase the flow rate of the tail gas flowing out of the separation device, so that the tail gas is evenly mixed before entering the adsorption device, thereby ensuring that the tail gas can quickly pass through the adsorption device, improving the adsorption effect, and improving the overall efficiency of the tail gas treatment system; on the other hand, it can also overcome the pressure loss in the system, avoid gas retention or poor flow, and adjust the flow rate of the tail gas according to the different concentrations of the tail gas, thereby ensuring the consistency of the treatment effect.

[0058] In the utility model, the above-mentioned adsorption device comprises at least two sub-adsorption devices connected in series. The adsorption materials in these sub-adsorption devices are independently selected from activated carbon, zeolite, zinc-based metal organic framework material (ZIF-8), activated alumina, silica gel and polymer adsorbent, preferably activated carbon. Among them, the polymer adsorbent may include polystyrene-based adsorbent, polyurethane adsorbent, and / or polyvinyl alcohol-based adsorbent and polymethyl methacrylate-based adsorbent having an amine-philic group.

[0059] In one embodiment, the adsorption device comprises a primary activated carbon adsorption box 12 and a secondary activated carbon adsorption box 13 connected in series, so that the exhaust gas sequentially passes through the primary activated carbon adsorption box 12 and the secondary activated carbon adsorption box 13. The utility model can more effectively remove the residual volatile organic matter and moisture in the exhaust gas by allowing the exhaust gas to sequentially pass through two sets of activated carbon adsorption boxes to obtain treated clean exhaust gas.

[0060] In the present utility model, if Figure 1 As shown, the adsorption device is connected to the chimney 14 through a pipeline, and the utility model discharges the treated tail gas through the chimney 14.

[0061] Composite tail gas treatment method

[0062] The composite tail gas treatment device of the utility model is used by the following method, which comprises a first cooling treatment step, an acid treatment step and a second cooling treatment step.

[0063] The first cooling treatment step includes performing a first cooling treatment on the tail gas by means of a cooling fluid, so that the tail gas is cooled and a first part of the amine components in the tail gas is condensed into liquid.

[0064] The acid treatment step includes performing acid treatment on the tail gas after the first cooling treatment to neutralize the second part of the amine components in the tail gas.

[0065] The second cooling treatment step includes performing a second cooling treatment on the tail gas after the acid treatment, so that the third part of the amine components in the tail gas after the acid treatment.

[0066] In the utility model, the above-mentioned composite tail gas treatment method also includes a separation step and an adsorption step.

[0067] The separation step includes passing the tail gas after the second cooling treatment step into a separation device for gas-liquid separation to remove part of the water in the tail gas.

[0068] The adsorption step includes adsorbing the tail gas after gas-liquid separation to remove volatile organic compounds in the tail gas.

[0069] According to a specific embodiment, the first cooling step in the treatment method of the utility model includes heat exchange between the cooling fluid and the tail gas to cool the tail gas. When the tail gas temperature is reduced to below the dew point temperature of some components in the tail gas, such as amine components and water vapor, these components and water vapor are condensed into liquid. This step helps to remove some amine components, water and methanol from the tail gas, thereby reducing the burden of the subsequent acid treatment step. The amine components that can be removed in this step may include some trimethylamine, nitrobenzene and aniline.

[0070] According to one embodiment, the cooling step may include two or more consecutive sub-cooling steps, and the cooling medium used in each sub-cooling step may be cold water. Moreover, in each sub-cooling step, the flow direction of the cooling medium is opposite to the flow direction of the exhaust gas, that is, the exhaust gas flows from bottom to top, and the cooling medium flows from top to bottom. Preferably, the cooling medium flows in the tubes of the heat exchanger, and the exhaust gas exchanges heat with the cooling medium through the tube walls, and is then cooled down to a temperature at which some components are condensed. The cooling medium may be a medium such as low-temperature chilled water or a refrigerant, and the temperature of the cooling medium is generally -4°C-6°C. The exhaust gas temperature after condensation is 5°C-20°C.

[0071] According to a specific embodiment, the first cooling treatment step may include a first sub-cooling treatment step and a second sub-cooling treatment step, and preferably, may include a first deep condensation step and a second deep condensation step. The tail gas cooled after the first cooling treatment step is used for a subsequent acid treatment step, and the condensed liquid component containing trimethylamine is transported to a post-treatment device, such as an incineration device.

[0072] In the composite tail gas treatment method of the utility model, the acid treatment step may include three or more continuous sub-acid treatment steps. In each sub-acid treatment step, tail gas is input from the lower part of each sub-acid treatment device, and acid solution is pumped to the upper part of the sub-acid treatment device for input, thereby realizing the reverse flow of airflow and acid solution, ensuring the full contact of tail gas and acid solution. Under the effect of acid solution, for example, under the spraying effect of acid solution, the tail gas after the first cooling treatment is fully contacted with the acid solution countercurrent in the packing layer in the sub-acid treatment device, and neutralization reaction is carried out, thereby removing most of the amine components in the tail gas, such as trimethylamine and aniline. In a specific embodiment, each sub-acid treatment step includes at least three packing layers and an acid solution sprayer arranged on each packing layer, thereby making the tail gas and the acid solution have sufficient contact time and reaction opportunity in the packing layer, thereby improving the removal degree of amine components in the tail gas. The salt solution produced by the neutralization reaction after acid treatment is discharged from the liquid outlet at the bottom of the acid treatment device to the post-treatment step, and the acid-treated tail gas is input from the gas outlet at the top of the acid treatment device to the next acid treatment step, or to the downstream second cooling treatment step.

[0073] The tail gas treated with the acid described above carries a large amount of moisture, and also has a certain amount of residual organic volatiles. In the composite tail gas treatment method of the utility model, the second cooling step may include subjecting the tail gas treated with the acid to a second cooling treatment, so that the moisture and residual organic volatiles carried in the tail gas are condensed into liquid. Preferably, the second cooling step is carried out in a surface cooler. The second cooling step can further remove moisture and organic volatiles from the tail gas treated with the acid, which helps to improve the treatment efficiency of the downstream adsorption step. According to one embodiment, in the surface cooler, the refrigerant or refrigeration medium flows through the inner cavity of the metal pipe, and the air to be treated flows through the outer wall of the metal pipe for heat exchange to achieve the purpose of cooling the tail gas. The surface cooler can not only cool the tail gas, but also dehumidify the tail gas and reduce the amount of water carried by the tail gas. Avoid a large amount of water vapor from entering the adsorption box to affect the effect and service life of the adsorbent.

[0074] In the present invention, the separation step includes using centrifugal force to separate the tail gas after the second cooling treatment, so as to separate the gas and liquid to remove part of the water in the tail gas. The separated gas is used for the downstream adsorption step.

[0075] According to one embodiment, a gas flow regulating step may be further included between the separation step and the adsorption step. That is, the gas flow regulating step may regulate the flow of the tail gas flowing out of the tail gas step by setting a gas flow regulating device, such as an induced draft fan, thereby improving the tail gas treatment efficiency, enhancing the gas mixing uniformity, reducing the pressure loss in the treatment system, regulating the gas flow, protecting the equipment and improving the system stability, thereby significantly improving the overall performance of the tail gas treatment process.

[0076] In the treatment method of the utility model, the above-mentioned adsorption step may include two or more consecutive sub-adsorption steps, and the tail gas after gas-liquid separation is subjected to adsorption treatment to remove volatile organic matter in the tail gas. The adsorption material used in the adsorption step may be as described above. The tail gas after the above-mentioned adsorption step may be discharged into the air. According to one embodiment, the gas flow rate in the adsorption step may be 0.2m / s-4m / s.

[0077] In summary, the exhaust gas treated by the composite exhaust gas treatment method of the utility model can achieve no obvious odor (no odor that can be smelled by the human body), and the outlet emission concentration of trimethylamine is zero.

[0078] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any appropriate manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention, and all belong to the protection scope of the present invention. These simple modifications all belong to the protection scope of the present invention.

[0079] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A composite tail gas treatment system, characterized in that: It includes a first cooling device, an acid treatment device and a second cooling device connected in sequence according to the exhaust gas flow direction: Wherein, the first cooling device comprises two or more first sub-cooling devices connected in series, which are configured to perform a first cooling treatment on the tail gas to remove a first part of the amine components in the tail gas; The second cooling device includes one or more second sub-cooling devices, which are configured to perform a second cooling treatment on the tail gas treated with acid, so as to remove residual organic components in the tail gas.

2. The composite tail gas treatment system according to claim 1, characterized in that: further comprising a separation device and an adsorption device; The separation device is configured to perform gas-liquid separation on the tail gas that has undergone the second cooling treatment; The adsorption device is configured to adsorb volatile organic compounds in the tail gas that has undergone gas-liquid separation.

3. The composite tail gas treatment system according to claim 1, characterized in that: The first cooling device includes two or more condensers connected in series, and the last condenser is connected to the acid treatment device.

4. The composite tail gas treatment system according to claim 1, characterized in that: The acid treatment device comprises three or more acid treatment devices connected in series.

5. The composite tail gas treatment system according to claim 4, characterized in that: The acid treatment device comprises a primary acid washing tower, a secondary acid washing tower and a tertiary acid washing tower connected in series, wherein the primary acid washing tower, the secondary acid washing tower and the tertiary acid washing tower are respectively provided with three groups of packing layers and sprayers to remove the second part of amine components in the tail gas.

6. The composite tail gas treatment system according to claim 5, characterized in that: The first-stage pickling tower, the second-stage pickling tower and the third-stage pickling tower are sequentially provided with an upper acid liquid sprayer, an upper tower plate structured packing, a middle acid liquid sprayer, a middle tower plate structured packing, a lower acid liquid sprayer and a lower tower plate structured packing from top to bottom.

7. The composite tail gas treatment system according to claim 2, characterized in that: The adsorption device comprises two or more sub-adsorption devices connected in series.

8. The composite tail gas treatment system according to claim 1, characterized in that: The second cooling device is a surface cooler.

9. The composite tail gas treatment system according to claim 2, characterized in that: The separation device is a gas-liquid separator.

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