VOCS processing device

Abstract

The utility model discloses a VOCS (volatile organic compounds) treatment device, which relates to the technical field of industrial waste gas treatment and comprises a diesel tank body, a cooling component, an activated carbon adsorption system and a tail gas chimney which are sequentially communicated. A liquid diesel oil recovery device is arranged at the output end of the cooling assembly and used for recovering condensed liquid diesel oil, activated carbon is arranged in the activated carbon adsorption system and used for adsorbing residual diesel oil waste gas, and a nitrogen pipeline is arranged at the top of the activated carbon adsorption system and used for desorbing and regenerating the activated carbon in the activated carbon adsorption system; and the mixed gas of nitrogen and diesel oil is conveyed to the input end of the cooling assembly for secondary condensation. The diesel waste gas recovery device is simple in structure, most diesel waste gas is condensed and recovered through the cooling assembly, adsorbed through the activated carbon adsorption system and discharged through the tail gas chimney, and standard emission of the waste gas is ensured. Meanwhile, the activated carbon adsorption system is purged and desorbed by utilizing nitrogen, so that the service life of activated carbon is longer.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial waste gas treatment technical field especially is a kind of VOCS processing apparatus. BACKGROUND

[0002] Diesel tank body in the process of storing and handling diesel, will produce a large amount of VOCS (volatile organic compounds), these exhaust gases if direct emission, will cause serious pollution to atmospheric environment, there are also security risks. The main way of these VOCS exhaust gas treatment has combustion method, adsorption method, condensation method etc., but using direct combustion method is not conducive to environmental protection and energy consumption is high, therefore adsorption method and condensation method etc. are widely developed.

[0003] Traditional waste gas treatment method such as simple condensation method or adsorption method, there are problems such as high energy consumption, low safety performance, large adsorbent dosage. Based on the above problems, a kind of VOCS exhaust gas can be effectively recycled under low operating cost, and the adsorption system is periodically purged and regenerated to ensure its adsorption performance, therefore, need a kind of high-efficiency, energy-saving, safe diesel tank area VOCS processing apparatus is the problem to be solved in the prior art. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of VOCS processing apparatus, the VOCS processing apparatus simple structure, by cooling component most diesel exhaust gas is condensed and recycled again through activated carbon adsorption system adsorption to ensure that exhaust gas meets the emission standard, while the activated carbon adsorption system in its activated carbon is saturated and is desorbed and regenerated by purging with hot nitrogen, effectively improve the service life of activated carbon adsorbent and the reuse of activated carbon.

[0005] To achieve the above object, the utility model provides a kind of VOCS processing apparatus, including diesel tank body, cooling component, activated carbon adsorption system and tail gas chimney that are sequentially communicated, the top of the diesel tank body is provided with fire arrester, the air outlet of the fire arrester is communicated with the cooling component by fan, the output end of the cooling component is provided with liquid diesel recovery device, the bottom of the diesel tank body is equipped with with the liquid diesel recovery device intercommunication inlet, the inlet of the diesel tank body is communicated with the liquid diesel recovery device by liquefied diesel pipeline, the inside of the activated carbon adsorption system is provided with activated carbon, and its top is provided with nitrogen pipeline to realize the desorption regeneration of the activated carbon in it, the bottom of the activated carbon adsorption system is communicated with the input end of the cooling component by vacuum pump, realizes nitrogen diesel gas mixture to be transported to the input end of the cooling component and carries out secondary condensation, the output end of the activated carbon adsorption system is communicated with the tail gas chimney.

[0006] Preferably, the cooling assembly includes a conventional refrigeration unit and a cryogenic refrigeration unit, which are connected in series. The fan sequentially draws diesel exhaust gas through the conventional refrigeration unit to the cryogenic refrigeration unit, where it is condensed and then flows out. The conventional refrigeration unit is equipped with a precooler, and the cryogenic refrigeration unit is equipped with a cryogenic refrigeration unit.

[0007] Preferably, the precooler is connected to the conventional refrigeration unit, and its cooling medium is cold water. After the diesel exhaust gas flows through the conventional refrigeration unit, it is initially cooled to 3-5°C. The cryogenic unit is connected to the cryogenic unit, and its cooling medium is a refrigerant. After flowing through the cryogenic unit, it condenses the diesel exhaust gas to -35°C, thereby realizing the phase transformation of most of the diesel components in the diesel exhaust gas into liquid diesel for recovery.

[0008] Preferably, the liquid diesel recovery device is equipped with a solvent storage tank for recovering liquid diesel. A level gauge is installed on one side of the solvent storage tank near the output end of the cooling component, and the other side is connected to the inlet of the diesel tank through a magnetic pump to pump the liquid diesel into the diesel tank.

[0009] Preferably, the activated carbon adsorption system includes two activated carbon tanks connected in parallel.

[0010] Preferably, an explosion-proof electric heater is provided at the connection between the nitrogen pipeline and the activated carbon adsorption system to heat the nitrogen in the nitrogen pipeline, and the heated nitrogen is used to purge and desorb the activated carbon in the activated carbon tank.

[0011] Preferably, both the precooler and the cryocooler are connected by detachable flanges.

[0012] Therefore, the VOCs treatment device of this invention, adopting the above-described structure, has the following advantages compared with the prior art:

[0013] (1) In this utility model, the precooler of the cooling component is connected to the general refrigeration unit to initially cool the exhaust gas and reduce the load at the back end. Then, it is connected to the deep refrigeration unit through the deep refrigeration unit to further cool the diesel exhaust gas to -35°C, so that most of the diesel components in the oil and gas undergo phase change and condense into liquid diesel, which is then recycled through the liquid diesel recovery device. The precooler and deep refrigeration unit are detachable flange connections, which are easy to disassemble.

[0014] (2) The VOCs treatment device in this utility model has a simple structure. Two activated carbon tanks are connected in parallel in the activated carbon adsorption system. The activated carbon tanks are filled with activated carbon to adsorb the remaining oil and gas in the diesel exhaust gas. The two activated carbon tanks work alternately. When one activated carbon tank is close to saturation, the diesel exhaust gas can be switched to the other activated carbon tank to continue adsorption, ensuring the continuity of exhaust gas treatment.

[0015] (3) In this invention, nitrogen is used to purge and desorb the activated carbon adsorption system. Hot nitrogen can remove and replace hydrocarbons, making the activated carbon regeneration more thorough and effectively improving the service life of the activated carbon. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the VOCs processing device of this utility model.

[0017] Figure label:

[0018] 1. Diesel tank; 2. Flame arrester; 3. Fan; 4. Cooling components; 41. General refrigeration unit; 42. Precooler; 43. Chilled water; 44. Cryogenic unit; 45. Cryogenic heater; 46. Refrigerant; 5. Liquid diesel recovery device; 51. Solvent storage tank; 52. Level gauge; 53. Magnetic pump; 6. Activated carbon adsorption system; 61. Activated carbon canister; 7. Nitrogen pipeline; 71. Explosion-proof electric heater; 8. Exhaust chimney; 9. Nitrogen-diesel mixture; 10. Vacuum pump; 11. Diesel gas pipeline; 12. Liquefied diesel pipeline; 13. Diesel exhaust outlet; 14. Liquid inlet. Detailed Implementation

[0019] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0020] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] Example

[0022] like Figure 1This is a schematic diagram of the overall structure of an embodiment of the VOCs treatment device of the present invention. The present invention provides a VOCs treatment device, including a diesel tank 1, a cooling assembly 4, an activated carbon adsorption system 6, and an exhaust gas chimney 8 connected in sequence. The top of the diesel tank 1 is provided with a diesel exhaust gas outlet 13 and a flame arrester 2. The outlet of the flame arrester 2 is connected to the cooling assembly 4 through a fan 3. The cooling assembly 4 includes a general refrigeration unit 41 and a cryogenic unit 44, which are connected in series. The fan 3 guides the diesel exhaust gas sequentially through the general refrigeration unit 41 to the cryogenic unit 44 for condensation and then out. A precooler 42 is provided on the general refrigeration unit 41, and a cryogenic unit 45 is provided on the cryogenic unit 44. The precooler 42 is connected to the general refrigeration unit 41, and the cryogenic unit 45 is connected to the cryogenic unit 44. The cooling medium of the precooler 42 is chilled water 43, and the cooling medium of the cryogenic unit 45 is refrigerant 46. The diesel exhaust gas first flows through the general refrigeration unit 41, where it is initially cooled to 3-5°C to reduce the load at the downstream end. Then, it flows through the cryogenic unit 44, where it is condensed to -35°C. The cryogenic unit 45 adopts an indirect heat exchange method, where the refrigerant condenses the refrigerant 46, and the refrigerant 46 then condenses the diesel exhaust gas, so that most of the diesel components in the diesel exhaust gas are converted into liquid diesel for recovery. At the same time, both the precooler 42 and the cryogenic unit 45 adopt detachable flange connections for easy disassembly. A liquid diesel recovery device 5 is provided at the output end of the cooling component 4, and an inlet 14 connected to the liquid diesel recovery device 5 is provided at the bottom of the diesel tank 1. The inlet 14 of the diesel tank 1 is connected to the liquid diesel recovery device 5 through a liquefied diesel pipeline 12. The liquid diesel recovery device 5 is provided with a solvent storage tank 51 for recovering liquid diesel. A level gauge 52 is provided on the side of the solvent storage tank 51 near the output end of the cooling component 4, and the other side is connected to the inlet 14 of the diesel tank 1 through a magnetic pump 53. The liquid diesel recovered by the output end of the condensing component is temporarily stored in the solvent storage tank 51. When the liquid level reaches the set value, it is automatically output by the magnetic pump 53, so as to pump the liquid diesel into the diesel tank 1. The cooling component 4 is connected to the activated carbon adsorption system 6 via a diesel gas pipeline 11. The activated carbon adsorption system 6 includes two activated carbon canisters 61 connected in parallel. Activated carbon is installed inside the activated carbon canisters 61. After the low-concentration diesel exhaust gas is condensed by the cooling component 4, it enters the activated carbon adsorption system 6 and is adsorbed by the activated carbon. When one activated carbon canister 61 is close to saturation, it can be switched to the other activated carbon canister 61 to continue adsorption, ensuring the continuity of diesel exhaust gas adsorption. Since the output end of the activated carbon adsorption system 6 is connected to the exhaust gas chimney 8, the qualified exhaust gas is discharged through the exhaust gas chimney 8.Furthermore, a nitrogen pipeline 7 is installed at the top, and an explosion-proof electric heater 71 is installed at the connection between the nitrogen pipeline 7 and the activated carbon adsorption system 6 to heat the nitrogen in the nitrogen pipeline 7. The heated nitrogen is used to purge and desorb the activated carbon in the activated carbon tank 61, thereby achieving desorption and regeneration of the activated carbon inside. The bottom of the activated carbon adsorption system 6 is connected to the input end of the cooling component 4 through a vacuum pump 10, so that the nitrogen-diesel gas mixture 9 is delivered to the input end of the cooling component 4 for secondary condensation. At the same time, after the activated carbon in the activated carbon tank 61 is purged and desorbed, the service life of the activated carbon is extended.

[0023] Working principle: First, diesel exhaust gas passes through flame arrester 2 and enters fan 3, which then sends it to precooler 42. In precooler 42, it is initially cooled to about 3-5℃, and then enters cryogenic cooler 45. Cryogenic cooler 45 uses refrigerant to condense coolant 46, and coolant 46 further condenses the exhaust gas to -35℃, causing most of the diesel components in the diesel exhaust gas to undergo phase change liquefaction and recovery. The recovered liquid diesel is temporarily stored in solvent storage tank 51. When the liquid level reaches the set value, magnetic pump 53 automatically outputs and recovers it into diesel tank 1. After condensation, the low-concentration exhaust gas enters activated carbon adsorption system 6, where the diesel exhaust gas is adsorbed by activated carbon and then discharged through exhaust chimney 8. When one activated carbon canister 61 is close to saturation, it can be switched to another activated carbon canister 61 to continue adsorption, ensuring the continuity of diesel exhaust gas adsorption. At the same time, hot nitrogen gas heated by the explosion-proof electric heater 71 is introduced into the top of the saturated activated carbon canister 61 for purging. The hot nitrogen gas diffuses from the top to the activated carbon bed, removing and replacing hydrocarbons. Vacuum desorption is performed by the vacuum pump 10, and the enriched and concentrated nitrogen-diesel gas mixture 9 is delivered to the inlet of the front-end cooling component 4 for secondary condensation. The activated carbon is desorbed and regenerated by purging with hot nitrogen gas, which extends the service life of the activated carbon adsorbent and ensures that the exhaust gas meets the emission standards.

[0024] Therefore, the present invention has a simple structure. Most of the diesel exhaust gas is condensed and recovered by the cooling component and then adsorbed by the activated carbon adsorption system to ensure that the exhaust gas meets the emission standards. At the same time, the activated carbon in the activated carbon adsorption system that is saturated with adsorption is desorbed and regenerated by purging with hot nitrogen, which effectively improves the service life and reusability of the activated carbon adsorbent.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A VOCs processing device, characterized in that: The system comprises a diesel tank, a cooling assembly, an activated carbon adsorption system, and an exhaust gas chimney, all connected in sequence. A flame arrester is installed on the top of the diesel tank, and the outlet of the flame arrester is connected to the cooling assembly via a fan. A liquid diesel recovery device is installed at the output end of the cooling assembly. An inlet connected to the liquid diesel recovery device is located at the bottom of the diesel tank, and the inlet of the diesel tank is connected to the liquid diesel recovery device via a liquefied diesel pipeline. The activated carbon adsorption system contains activated carbon, and a nitrogen pipeline is installed at its top to desorb and regenerate the activated carbon. The bottom of the activated carbon adsorption system is connected to the input end of the cooling assembly via a vacuum pump, allowing a nitrogen-diesel mixture to be transported to the input end of the cooling assembly for secondary condensation. The output end of the activated carbon adsorption system is connected to the exhaust gas chimney.

2. The VOCs processing device according to claim 1, characterized in that: The cooling system includes a conventional refrigeration unit and a cryogenic refrigeration unit, which are connected in series. The fan draws diesel exhaust gas sequentially through the conventional refrigeration unit to the cryogenic refrigeration unit, where it is condensed and then flows out. The conventional refrigeration unit is equipped with a precooler, and the cryogenic refrigeration unit is equipped with a cryogenic refrigeration unit.

3. The VOCs processing device according to claim 2, characterized in that: The precooler is connected to the conventional refrigeration unit, and its cooling medium is cold water. After the diesel exhaust gas flows through the conventional refrigeration unit, it is initially cooled to 3-5°C. The cryogenic unit is connected to the cryogenic unit, and its cooling medium is a refrigerant. After flowing through the cryogenic unit, it condenses the diesel exhaust gas to -35°C, realizing the phase transformation of most of the diesel components in the diesel exhaust gas into liquid diesel for recovery.

4. The VOCs processing device according to claim 3, characterized in that: The liquid diesel recovery device is equipped with a solvent storage tank for recovering liquid diesel. A level gauge is installed on one side of the solvent storage tank near the output end of the cooling component, and the other side is connected to the inlet of the diesel tank through a magnetic pump to pump the liquid diesel into the diesel tank.

5. A VOCs processing device according to claim 4, characterized in that: The activated carbon adsorption system includes two activated carbon tanks, which are connected in parallel.

6. A VOCs processing apparatus according to claim 5, characterized in that: An explosion-proof electric heater is installed at the connection between the nitrogen pipeline and the activated carbon adsorption system to heat the nitrogen in the nitrogen pipeline, and the heated nitrogen is used to purge and desorb the activated carbon in the activated carbon tank.

7. A VOCs processing apparatus according to claim 6, characterized in that: Both the precooler and the cryocooler are connected by detachable flanges.

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