VOCs exhaust gas treatment system

Abstract

The utility model discloses a VOCs tail gas processing system relates to industrial tail gas processing technical field, wherein, VOCs tail gas processing system includes washing tower subassembly, gas -liquid separation subassembly, purification subassembly and combustion decomposition subassembly. Among them, washing tower subassembly includes tower body and washing oil pump subassembly, and washing oil pump subassembly is linked with the inner chamber of tower body to be used for outputting absorbent to its inside, and the input of gas -liquid separation subassembly and the gas -exhausting portion of tower body are connected, the utility model scheme has provided a complete, and the treatment system that carries out the processing to VOCs tail gas, and this system contains multiple purification treatment structure, can carry out multistage decomposition treatment to VOCs tail gas, under the premise of guaranteeing VOCs tail gas processing effect, can also effectively reduce the cost investment in tail gas processing process, has good application prospect.

Description

Technical Field

[0001] This utility model relates to the field of industrial exhaust gas treatment technology, and in particular to a VOCs exhaust gas treatment system. Background Technology

[0002] In the processes of tar pitch reforming and activated coke preparation, the tar reforming unit generates a large amount of VOCs exhaust gas containing organic waste. This exhaust gas has a complex composition and high volatility; direct emission of such gas would severely pollute the atmospheric environment and harm human health, failing to comply with environmental protection policies and green production requirements.

[0003] Existing VOCs exhaust gas treatment devices have many shortcomings: some devices only use a single adsorption or combustion process, which is not thorough enough and makes it difficult to meet emission standards; some devices have complex structures and redundant components, resulting in complicated process routes and high operation difficulty; and some devices have high manufacturing costs and high operating energy consumption, making it difficult to achieve large-scale industrial application, and their long-term operating stability is poor, which cannot meet the needs of continuous production.

[0004] Therefore, there is an urgent need for a VOCs exhaust gas treatment device that is simple in structure, has a clear process, good treatment effect, is economical in cost, and can be stably operated in an industrial setting, in order to solve the technical problems of waste gas emission and green utilization during the tar pitch reforming process. Utility Model Content

[0005] The main purpose of this invention is to propose a VOCs exhaust gas treatment system, which aims to solve the technical problems of waste gas emission and green utilization during the tar pitch reforming process.

[0006] To achieve the above objectives, the VOCs exhaust gas treatment system proposed in this utility model includes: A scrubbing tower assembly includes a tower body and a scrubbing pump assembly, wherein the scrubbing pump assembly is connected to the inner cavity of the tower body for discharging absorbent into the tower body. A gas-liquid separation component, the input end of which is connected to the gas outlet of the tower body, is used to separate liquid impurities in the tail gas; A purification component, connected to the output end of the gas-liquid separation component, is used for purifying the exhaust gas; and, The combustion decomposition component is connected to the output end of the purification component to perform high-temperature decomposition on the purified exhaust gas.

[0007] In one embodiment, the tower body includes two inlets located at its bottom end; The washing tower assembly also includes a tar reforming tank, the output end of which is connected to one of the inlets, and the output end of the washing pump assembly is connected to the other inlet. Furthermore, the two inlet ports are arranged opposite each other in the axial direction of the tower body.

[0008] In one embodiment, the washing tower assembly further includes a circulating mixing device, which includes a circulating pipe and a circulating pump body. Both ends of the circulating pipe are connected to the inner cavity of the tower body, and the circulating pump is installed on the circulating pipe.

[0009] In one embodiment, the VOCs exhaust gas treatment system further includes a heat exchange device, which is at least partially connected to the circulation pipe.

[0010] In one embodiment, the purification component includes an activated carbon adsorption tank, the inlet of which is connected to the output of the gas-liquid separation component, and the output pipe of the activated carbon adsorption tank is provided with a first branch pipe and a second branch pipe. The first branch pipe is connected to the combustion decomposition component, and the second branch pipe is provided with a combustible gas concentration detection unit.

[0011] In one embodiment, differential pressure gauges are provided at the inlet and outlet positions of the activated carbon adsorption tank.

[0012] In one embodiment, a safety detection component is further provided between the first branch pipeline and the combustion decomposition assembly, the safety detection component including a water seal box and a flame arrester; Wherein, the end of the first branch pipe away from the purification component is located below the liquid surface in the water seal tank, the flame arrester is installed on the air inlet pipe of the combustion decomposition component, and the air inlet pipe of the combustion decomposition component is located above the liquid surface in the water seal tank.

[0013] In one embodiment, the scrubbing tower assembly further includes a liquid phase separation assembly, which includes a liquid phase separation pump and a collection tank. The liquid phase separation pump is connected to the discharge port of the tower body, and the other end of the liquid phase separation pump is connected to the collection tank.

[0014] In one embodiment, the gas-liquid separation assembly includes a separation tank and a waste liquid tank. The separation tank is connected to the gas outlet of the tower body. The upper and lower ends of the separation tank are respectively provided with a gas outlet and a discharge outlet. The gas outlet is connected to the purification assembly, and the discharge outlet is connected to the waste liquid tank.

[0015] In one embodiment, the wash oil pump assembly includes a wash oil pump body and a storage tank; The wash oil pump body is located between the storage tank and the tower body to introduce the absorbent in the storage tank into the tower body.

[0016] The technical solution of this utility model has the following advantages: Thorough treatment effect: Through a multi-stage treatment process of pre-separation in a scrubbing tower, gas-liquid separation in a separation tank, adsorption by an activated carbon device, and high-temperature oxidation in an incinerator, organic waste in VOCs is completely removed, ensuring that exhaust gas meets emission standards. Structural and process optimization: The device contains only core functional components, with a simple and compact structure and a clear and orderly process route, reducing operation difficulty and maintenance costs; Strong industrial adaptability: The overall design takes into account both economy and practicality, with low manufacturing cost and low operating energy consumption, which can meet the needs of large-scale industrial applications. Safe and stable operation: Safety accessories monitor the concentration of flammable gases in real time to avoid safety hazards, while the reasonable layout of components ensures long-term continuous and stable operation of the device; Green and environmentally friendly: It effectively solves the problem of harmful waste gas emissions from the tar reforming unit, realizes green treatment of waste gas, and meets the requirements of environmental protection policies. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the overall structure of an embodiment of the VOCs exhaust gas treatment system provided by this utility model.

[0019] Explanation of icon numbers: 100. VOCs exhaust gas treatment system; 1. Scrubber tower assembly; 11. Tower body; 12. Wash oil pump assembly; 121. Wash oil pump body; 122. Storage tank; 13. Circulating mixing device; 131. Circulating pipeline; 1311. Heat exchange device; 132. Circulating pump body; 14. Liquid phase separation assembly; 141. Liquid phase separation pump; 142. Collection tank; 15. Tar reforming tank; 2. Gas-liquid separation assembly; 21. Separation box; 22. Waste liquid tank; 3. Activated carbon adsorption tank; 31. First branch pipeline; 32. Second branch pipeline; 321. Combustible gas concentration detection unit; 33. Differential pressure gauge; 4. Safety detection assembly; 41. Water seal box; 42. Flame arrester; 5. Combustion decomposition assembly.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] In the processes of tar pitch reforming and activated coke preparation, the tar reforming unit generates a large amount of VOCs exhaust gas containing organic waste. This exhaust gas has a complex composition and high volatility; direct emission of such gas would severely pollute the atmospheric environment and harm human health, failing to comply with environmental protection policies and green production requirements.

[0025] Existing VOCs exhaust gas treatment devices have many shortcomings: some devices only use a single adsorption or combustion process, which is not thorough enough and makes it difficult to meet emission standards; some devices have complex structures and redundant components, resulting in complicated process routes and high operation difficulty; and some devices have high manufacturing costs and high operating energy consumption, making it difficult to achieve large-scale industrial application, and their long-term operating stability is poor, which cannot meet the needs of continuous production.

[0026] Therefore, there is an urgent need for a VOCs exhaust gas treatment device that is simple in structure, has a clear process, good treatment effect, is economical in cost, and can be stably operated in an industrial setting, in order to solve the technical problems of waste gas emission and green utilization during the tar pitch reforming process.

[0027] This utility model proposes a VOCs exhaust gas treatment system 100 to solve the above problems.

[0028] Please see Figure 1 In one embodiment of this utility model, the VOCs exhaust gas treatment system includes a scrubbing tower assembly 1, a gas-liquid separation assembly 2, a purification assembly, and a combustion decomposition assembly 5. The scrubbing tower assembly 1 includes a tower body 11 and an oil washing pump assembly 12, which is connected to the inner cavity of the tower body 11 to output absorbent. The gas-liquid separation assembly 2 has its input end connected to the gas outlet of the tower body 11 to separate liquid impurities from the exhaust gas. The purification assembly is connected to the output end of the gas-liquid separation assembly 2 to purify the exhaust gas. The combustion decomposition assembly 5 is connected to the output end of the purification assembly to perform high-temperature decomposition on the purified exhaust gas.

[0029] "VOCs exhaust gas" generally refers to waste gas containing volatile organic compounds emitted during industrial production processes. Specifically, it includes organic compounds with high saturated vapor pressure at room temperature (typically greater than 70 Pa) and low boiling points (typically between 50℃ and 260℃). Common VOCs exhaust gases include benzene, toluene, formaldehyde, and various hydrocarbons. This application mainly focuses on the treatment of VOCs exhaust gas generated in the processes of tar pitch reforming and activated coke preparation.

[0030] Specifically, such as Figure 1 As shown, when specifically treating VOCs exhaust gas, the VOCs exhaust gas generated during the tar reforming process first needs to be introduced into the tower body 11 from a position near the lower end of the tower body 11. The outlet of the tower body 11 is located at the top of the tower, thus forming a "bottom in, top out" airflow path within the tower body 11.

[0031] When VOCs exhaust gas is introduced into the tower body 11, the synchronous oil washing pump assembly 12 will introduce the absorbent (which can be selected as tar or special absorbent liquid according to the exhaust gas composition) into the tower body 11 according to the above-mentioned airflow path, so that most of the heavy organic waste (such as polycyclic aromatic hydrocarbons and heavy hydrocarbons) in the exhaust gas is captured by the absorbent through dissolution and adsorption, thereby achieving preliminary purification of the exhaust gas.

[0032] The exhaust gas, after preliminary treatment, is introduced into the gas-liquid separation assembly 2 through the upper end of the tower body 11. The gas-liquid separation assembly 2 serves as a secondary gas-liquid separation unit, with its inlet directly connected to the gas outlet of the tower body 11. The outlet of the gas-liquid separation assembly 2 is located at the top of its structure. As the gas moves upwards within the gas-liquid separation assembly 2, it separates any entrained liquid impurities (absorbent droplets, exhaust gas condensate) to the bottom of the tank through gravity settling, thus providing relatively clean gas for subsequent exhaust gas treatment.

[0033] After initial purification, the exhaust gas undergoes further purification in a purification component. This component physically adsorbs some low-concentration light VOCs (such as benzene and toluene) in the exhaust gas, achieving deep purification. Because the purification component is a physical adsorption structure, it can also reduce the amount of VOCs introduced into the combustion decomposition component 5, thereby reducing fuel consumption and optimizing energy consumption.

[0034] The combustion decomposition component 5 is specifically configured as an incinerator, whose furnace chamber adopts an insulated structure design to ensure that the internal temperature is stably maintained above a certain threshold. This temperature setting is based on the chemical characteristics of the oxidation and decomposition of organic pollutants—only at a sufficiently high temperature can VOCs exhaust gas be completely decomposed into harmless CO2 and H2O, avoiding incomplete combustion that generates secondary pollution.

[0035] The above content provides a complete treatment system for VOCs exhaust gas. This system includes multiple purification structures that can perform multi-stage decomposition treatment of VOCs exhaust gas. While ensuring the treatment effect of VOCs exhaust gas, it can also effectively reduce the cost input in the exhaust gas treatment process and has good application prospects.

[0036] In some embodiments, such as Figure 1 As shown, the tower body 11 includes two inlets located at its bottom end; the washing tower assembly 1 also includes a tar reforming tank 15, the output end of which is connected to one of the inlets, and the output end of the washing pump assembly 12 is connected to the other inlet; and the two inlets are arranged opposite to each other in the axial direction of the tower body 11.

[0037] Specifically, it should be noted that one of the inlets connected to the tar reforming tank 15 is located above the inlet connected to the washing pump assembly 12. The tar reforming tank 15 and the washing pump assembly 12 operate simultaneously, forming a convection zone in the circumferential direction of the tower body 11, between the two corresponding inlets, thereby enhancing the adsorbent's capture effect on heavy organic matter.

[0038] To further enhance the mixing and reaction effect of the adsorbent and exhaust tar, in some implementations, such as... Figure 1 As shown, the washing tower assembly 1 also includes a circulating mixing device 13, which includes a circulating pipe 131 and a circulating pump body 132. Both ends of the circulating pipe 131 are connected to the inner cavity of the tower body 11, and the circulating pump is installed on the circulating pipe 131.

[0039] The two ends of the circulation pipe 131 are preferably arranged in the axial direction of the tower body 11. During the operation of the circulation pump 132, the mixture at the bottom of the tower body 11 will be circulated, which can extend the path of the multiphase mixture in reverse contact to a certain extent, so as to ensure the maximum utilization of the physical absorption of the adsorbent, reduce the material consumption cost, and thus control the amount of adsorbent.

[0040] The aforementioned circulating mixing device 13 can improve the flow effect of the mixture within the tower body 11, thereby enhancing the adsorption effect of the adsorbent. Besides the combination structure of the circulating pipe 131 and the circulating pump body 132, the corresponding disturbance structure can also be set as a stirring structure, etc. In actual design, the configuration can be tailored to the specific production conditions.

[0041] In some embodiments, the VOCs exhaust gas treatment system further includes a heat exchange device 1311, which is at least partially connected to the circulation pipe 131. The heat exchange device 1311, installed on the circulation pipe 131 in conjunction with a temperature monitoring device, can detect the actual temperature of the mixture within the tower body 11. Furthermore, during the intervention of the heat exchange device 1311, the temperature of the mixture can be adjusted synchronously, thereby ensuring that the mixing reaction is within the optimal temperature range, thus improving the effectiveness and stability of the mixing reaction.

[0042] In some embodiments, such as Figure 1As shown, the purification component includes an activated carbon adsorption tank 3. The inlet end of the activated carbon adsorption tank 3 is connected to the output end of the gas-liquid separation component 2. The output end pipeline of the activated carbon adsorption tank 3 is provided with a first branch pipeline 31 and a second branch pipeline 32. The first branch pipeline 31 is connected to the combustion decomposition component 5. The second branch pipeline 32 is provided with a combustible gas concentration detection unit 321.

[0043] The activated carbon adsorption tank 3 is filled with granular or honeycomb activated carbon structures, wherein the specific surface area of ​​the filler is ≥500m² / g. The highly porous structure is used to physically adsorb residual low-concentration light VOCs (such as benzene and toluene) in the gas, achieving deep purification of the exhaust gas.

[0044] During the exhaust gas treatment process, combustible gases are generated. To ensure safety during the gas treatment process, a combustible gas concentration detection unit 321 is installed on the second branch pipe 32. The combustible gas concentration detection unit 321 includes a monitoring element and a control valve. Both the monitoring unit and the control valve are installed on the second branch pipe. When the monitoring element detects that the combustible gas concentration in the activated carbon adsorption tank 3 is greater than a preset value, the control valve can be opened to release the unqualified gas, thereby preventing irreversible damage to the incinerator caused by the subsequent purification and oxidation process.

[0045] It is conceivable that the adsorption structure of activated carbon has an adsorption saturation point. After working for a period of time and when the internal material reaches adsorption saturation, it will affect the subsequent adsorption and treatment effect on waste gas. Therefore, it is necessary to monitor the working performance of the activated carbon adsorption tank 3.

[0046] Specifically, in some embodiments, differential pressure gauges 33 are installed at the inlet and outlet of the activated carbon adsorption tank 3. Specifically, the differential pressure gauges 33 are installed at the inlet and outlet of the activated carbon adsorption tank 3 to facilitate timely replacement or regeneration of activated carbon by operators based on pressure difference changes (generally, an inlet-outlet pressure difference greater than 2 kPa is considered adsorption saturation), adapting to the needs of continuous industrial operation.

[0047] In some embodiments, such as Figure 1 As shown, a safety detection component 4 is also provided between the first branch pipe 31 and the combustion decomposition component 5. The safety detection component 4 includes a water seal tank 41 and a flame arrester 42. The end of the first branch pipe 31 away from the purification component is located below the liquid level in the water seal tank 41. The flame arrester 42 is installed on the air inlet pipe of the combustion decomposition component 5, and the air inlet pipe of the combustion decomposition component 5 is located above the liquid level in the water seal tank 41.

[0048] In this example, the water seal box 41 and the flame arrester 42 can prevent backfire in the incinerator from affecting the front-end purification and separation components. This further improves the safety performance of the entire system's exhaust gas treatment process.

[0049] In some embodiments, such as Figure 1 As shown, the washing tower assembly 1 also includes a liquid phase separation assembly 14, which includes a liquid phase separation pump 141 and a collection tank 142. The liquid phase separation pump 141 is connected to the discharge port of the tower body 11, and the other end of the liquid phase separation pump 141 is connected to the collection tank 142.

[0050] Near the suction inlet of the liquid phase separation pump 141, a low-pressure vortex zone is generated through fluid dynamics design. This vortex actively "induces" bubbles to precipitate from the liquid and aggregate. These bubbles are then continuously extracted by a vacuum pumping device, and the "clean" liquid is then allowed to enter the impeller, thus completing the gas-liquid separation. The separated liquid is then collected in the collection tank 142 for further processing.

[0051] In some embodiments, such as Figure 1 As shown, the gas-liquid separation component 2 includes a separation tank 21 and a waste liquid tank 22. The separation tank 21 is connected to the gas outlet of the tower body 11. The upper and lower ends of the separation tank 21 are respectively provided with a gas outlet and a discharge outlet. The gas outlet is connected to the purification component, and the discharge outlet is connected to the waste liquid tank 22.

[0052] Specifically, the outlet of the separation chamber 21 is located at its upper end. The separated gas moves upward and is introduced into the activated carbon adsorption tank 3 through a pipeline structure for further purification. A small amount of liquid impurities in the gas will accumulate at the bottom of the separation chamber 21 under the influence of gravity. The waste liquid tank 22 is connected to the bottom cavity of the separation chamber 21, thereby enabling the centralized collection and treatment of the separated liquid impurities as much as possible. The above purification process mainly relies on the properties of the gas itself, without the need for external separation structures, thus minimizing cost while ensuring purification effectiveness.

[0053] In some embodiments, such as Figure 1 As shown, the wash oil pump assembly 12 includes a wash oil pump body 121 and a storage tank 122; the wash oil pump body 121 is disposed between the storage tank 122 and the tower body 11 for introducing the absorbent in the storage tank 122 into the tower body 11.

[0054] An absorbent is stored in the storage tank. When the cleaning oil pump is working, the absorbent in the storage tank 122 is introduced into the tower body 11 for reaction.

[0055] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A VOCs exhaust gas treatment system, characterized in that, include: A scrubbing tower assembly includes a tower body and a scrubbing pump assembly, wherein the scrubbing pump assembly is connected to the inner cavity of the tower body for discharging absorbent into the tower body. A gas-liquid separation component, the input end of which is connected to the gas outlet of the tower body, is used to separate liquid impurities in the tail gas; A purification component, connected to the output end of the gas-liquid separation component, is used for purifying the exhaust gas; and, The combustion decomposition component is connected to the output end of the purification component to perform high-temperature decomposition on the purified exhaust gas.

2. The VOCs exhaust gas treatment system as described in claim 1, characterized in that, The tower body includes two inlets located at its bottom end; The washing tower assembly also includes a tar reforming tank, the output end of which is connected to one of the inlets, and the output end of the washing pump assembly is connected to the other inlet. Furthermore, the two inlet ports are arranged opposite each other in the axial direction of the tower body.

3. The VOCs exhaust gas treatment system as described in claim 1, characterized in that, The washing tower assembly also includes a circulating mixing device, which includes a circulating pipe and a circulating pump. Both ends of the circulating pipe are connected to the inner cavity of the tower body, and the circulating pump is installed on the circulating pipe.

4. The VOCs exhaust gas treatment system as described in claim 3, characterized in that, The VOCs exhaust gas treatment system also includes a heat exchange device, which is at least partially connected to the circulation pipeline.

5. The VOCs exhaust gas treatment system as described in claim 1, characterized in that, The purification component includes an activated carbon adsorption tank, the inlet of which is connected to the output of the gas-liquid separation component. The output pipe of the activated carbon adsorption tank is provided with a first branch pipe and a second branch pipe. The first branch pipe is connected to the combustion decomposition component, and the second branch pipe is provided with a combustible gas concentration detection unit.

6. The VOCs exhaust gas treatment system as described in claim 5, characterized in that, Differential pressure gauges are installed at the inlet and outlet of the activated carbon adsorption tank.

7. The VOCs exhaust gas treatment system as described in claim 5, characterized in that, A safety detection component is also provided between the first branch pipeline and the combustion decomposition component, the safety detection component including a water seal box and a flame arrester; Wherein, the end of the first branch pipe away from the purification component is located below the liquid surface in the water seal tank, the flame arrester is installed on the air inlet pipe of the combustion decomposition component, and the air inlet pipe of the combustion decomposition component is located above the liquid surface in the water seal tank.

8. The VOCs exhaust gas treatment system as described in claim 2, characterized in that, The scrubbing tower assembly also includes a liquid phase separation assembly, which includes a liquid phase separation pump and a collection tank. The liquid phase separation pump is connected to the discharge port of the tower body, and the other end of the liquid phase separation pump is connected to the collection tank.

9. The VOCs exhaust gas treatment system as described in claim 1, characterized in that, The gas-liquid separation assembly includes a separation tank and a waste liquid tank. The separation tank is connected to the gas outlet of the tower body. The upper and lower ends of the separation tank are respectively provided with a gas outlet and a discharge outlet. The gas outlet is connected to the purification assembly, and the discharge outlet is connected to the waste liquid tank.

10. The VOCs exhaust gas treatment system as described in claim 1, characterized in that, The wash oil pump assembly includes a wash oil pump body and a storage tank; The wash oil pump body is located between the storage tank and the tower body to introduce the absorbent in the storage tank into the tower body.

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