CN108837665A - A kind of efficient Integrated Processing Unit of organic exhaust gas - Google Patents

Abstract

The invention is a high-efficiency comprehensive treatment device for organic waste gas, which includes a buffer tank, a blower, a condenser, a gas-liquid separation tank and an adsorption tower unit sequentially connected through a flue gas pipeline, the gas-liquid separation tank and the adsorption tower unit There is a gas junction between them. The fugitive emission VOCs waste gas collected from the workshop enters the buffer tank from the fugitive emission flue gas inlet, and the point source emission VOCs waste gas enters the gas junction through the point source emission gas inlet. The treated fugitive emission VOCs The exhaust gas and the untreated VOCs exhaust gas from point sources are mixed at the gas junction and then enter the adsorption tower unit for adsorption treatment. This device combines the advantages of condensation and adsorption methods. High-concentration VOCs waste gas is separated by condensation method, and low-concentration VOCs waste gas is checked by adsorption method, so that VOCs waste gas from organized and unorganized emissions can be effectively and comprehensively treated.

Description

An efficient comprehensive treatment device for organic waste gas

technical field

The invention relates to the field of environmental protection technology, and relates to a method for treating VOCs gas by means of physical technology, in particular to an efficient comprehensive treatment device for organic waste gas.

Background technique

Organic waste gas, also known as VOCs, mainly includes hydrocarbons, aromatic hydrocarbons, alcohols, aldehydes, ketones, lipids, amines and organic acids, etc. It is generally considered that the melting point is lower than room temperature, and the boiling point range is between 50 and 260 ° C Volatile organic compounds among them have the characteristics of strong volatility, special odor, irritation and toxicity, which will not only adversely affect the ecological environment, but also cause serious harm to human health. VOCs treatment technology can be divided into two categories: one is recovery technology, which enriches and separates VOCs by changing physical conditions such as temperature and pressure in a certain process, and gives priority to recycling, and takes further harmless treatment for those that have no use value. There are mainly condensation methods, adsorption methods, absorption methods and membrane separation methods, etc.; the second is destruction technology, through chemical or biochemical reactions, using heat, light, catalysts and microorganisms to convert VOCs into non-toxic or low-toxicity CO ₂ and H ₂ O. Toxic small molecular compounds enable VOCs to be treated, mainly including combustion method, low temperature plasma technology, photocatalytic degradation technology and biotechnology.

In the production workshops of petroleum, chemical, paint, pharmaceutical, printing and other industries, VOCs exhaust emissions are divided into two types: point source emissions and fugitive emissions: point source emissions refer to the emissions from production devices in the process, and the exhaust gas pressure is relatively high , the concentration and flow rate are relatively stable; fugitive emissions are not necessarily directly related to a specific production process or device, and may appear in various parts of the workshop, such as valves, flanges, storage tanks, cooling towers or circulating water cooling systems etc., the exhaust gas pressure is low, the concentration and flow change frequently, the fluctuation range is large, and it is extremely unstable.

CN105688596B discloses a multi-component VOCs adsorption condensation recovery device, including an adsorption system, a VOCs desorption condensation collection system and a refrigeration system, including an adsorption unit with multiple adsorbent fixed beds for precooling and dehumidification of exhaust gas. system; a VOCs desorption condensation collection system connected to the adsorption system for desorption and recovery of the adsorption fixed bed containing saturated adsorbent while the adsorption system is adsorbing, and the VOCs desorption condensation collection system is also provided for it. Condensation recovery connection to the refrigeration system. This technical solution has high VOCs treatment efficiency and low energy consumption, but it can only deal with VOCs emitted from point sources. CN206139013U discloses a kind of processing equipment of chemical storage tank VOCs fugitive discharge, comprises breather valve, adsorption tank and heat exchanger, the storage tank communicating port of breather valve is connected with chemical storage tank, the exhaust port of breather valve is connected with adsorption tank The air inlet of the adsorption tank is connected, the exhaust port of the adsorption tank is connected with the air inlet of the heat exchanger, the breathing valve can regulate the flow rate input into the adsorption tank, and the exhaust port of the adsorption tank is connected with the air inlet of the heat exchanger . This technical solution utilizes the characteristics of high-performance catalysts to independently decompose VOCs, and solves problems such as secondary pollution. However, the treatment efficiency of the device is not high, and it is difficult to effectively treat VOCs emitted from point sources on a large scale.

Therefore, due to the large differences in the concentration, flow, temperature and humidity of VOCs waste gas from point source emissions and fugitive emissions, it is difficult to achieve standard emissions and efficient recovery through a single treatment technology, and it is urgent to design a reasonable and feasible treatment technology. Combined routes to achieve efficient and comprehensive treatment of VOCs waste gas in production workshops.

Contents of the invention

The purpose of the present invention is to develop a high-efficiency comprehensive treatment device for organic waste gas in view of the defects of the prior art, and adopt the "condensation + adsorption" comprehensive treatment technology route to realize the uniformity of VOCs waste gas from point source emissions and fugitive emissions in the production workshop. Efficient comprehensive processing. The technical scheme of the present invention is as follows.

A high-efficiency comprehensive treatment device for organic waste gas, including a buffer tank, a blower, a condenser, a gas-liquid separation tank, and an adsorption tower unit sequentially connected through a flue gas pipeline, and a device is arranged between the gas-liquid separation tank and the adsorption tower unit At the gas junction, the fugitive emission VOCs exhaust gas collected from the workshop enters the buffer tank from the fugitive emission flue gas inlet, and the point source exhaust VOCs exhaust gas enters the gas junction through the point source exhaust gas inlet, and the gas junction passes through the adsorption pipeline and the adsorption The tower unit is connected, the adsorption pipeline is provided with an adsorption valve, and the gas outlet pipeline at the top of the adsorption tower is provided with an outlet valve, and the treated fugitive exhaust VOCs exhaust gas and the untreated point source exhaust VOCs exhaust gas are at the gas intersection After mixing, it enters the adsorption tower unit for adsorption treatment, and after the treatment is completed, it is discharged through the flue gas outlet by opening the outlet valve;

The vacuum pump and the adsorption tower unit are connected through a desorption pipeline, the desorption pipeline is provided with a desorption valve, the vacuum pump is connected with a buffer tank, and the vacuum pump transfers the desorption gas of the adsorption tower unit from the bottom to the bottom. And pass into the buffer tank, the fugitive discharge VOCs exhaust gas collected from the workshop is mixed with the desorption gas, the buffer tank is provided with a pressure sensor; the condenser and the gas-liquid separation tank are connected to the The liquid storage tank is connected, and the liquid storage tank is provided with a waste liquid outlet.

For fugitive emission of VOCs waste gas with low pressure and frequent changes in concentration and flow rate, the method of first condensation and then adsorption is used for treatment. The fugitive emission of VOCs waste gas and the desorption gas containing high concentration of VOCs generated during the desorption process are mixed in the buffer tank. The pressure sensor in the buffer tank shows that the pressure reaches a certain value, the blower is started, the mixed gas is boosted to the working pressure, and then it is transported from the top of the tank to the condenser, and most of the VOCs in the exhaust gas Cooled and condensed by the condensing agent of the condenser. The condensed waste gas is passed into the gas-liquid separation tank, the organic liquid is left in the gas-liquid separation tank, and the tail gas is passed into the gas junction, mixed with the VOCs waste gas discharged from the point source, and then enters the adsorption tower unit for adsorption treatment , the organic liquid at the bottom of the condenser and the gas-liquid separation tank flows to the liquid storage tank by itself, and is reused or regularly discharged through the waste liquid outlet.

In summary, this device combines the advantages of the condensation method and the adsorption method. The high-concentration VOCs waste gas is separated by condensation, and the low-concentration VOCs waste gas is checked by adsorption method, so that the VOCs waste gas in the workshop can be effectively and comprehensively treated, forming an efficient and stable operation. The comprehensive treatment process can meet the latest national emission standards with low investment and operating costs, and there is no secondary pollution.

Preferably, the adsorption tower unit includes an adsorption tower, and the interior of the adsorption tower is sequentially arranged with an inlet pipe, a swirl diffuser, an air uniform orifice plate, a deflector, a wire mesh orifice plate and an air outlet pipe along the movement direction of the exhaust gas. The inner space of the adsorption tower between the air hole plate and the screen hole plate is filled with adsorbent.

In this application, the diameter of the adsorption tower refers to the inner diameter, code D.

The inlet pipe is arranged at the bottom of the adsorption tower, the swirl diffuser is arranged on the inlet pipe, the bottom of the swirl diffuser is the same as the diameter of the inlet pipe and communicated with it, the A number of swirl plates are arranged on the swirl diffuser; the gas uniform orifice plate is located above the swirl diffuser, and the vertical distance between the gas uniform orifice plate and the swirl diffuser is greater than 1/6 of the diameter D of the adsorption tower, The diameter of the top of the swirl plate provided on the swirl diffuser does not exceed the diameter D of the adsorption tower, the diameter of the uniform orifice plate is the same as the diameter D of the adsorption tower, and the opening ratio of the uniform orifice plate is 50-80%.

The exhaust gas that enters the adsorption tower in parallel through the inlet pipe is transformed into a swirling airflow by the swirl diffuser, diffuses evenly to the uniform orifice plate, and then further disperses into the adsorption area in the tower through the uniform gas orifice plate. The swirl diffuser can effectively improve the distribution of exhaust gas on the orifice plate, avoid the formation of adsorption dead zone in the tower body, and improve the utilization rate and service life of the adsorbent.

The deflectors are arranged at equal intervals on both sides of the tower wall, inclined downward by 10-30°, and the transverse length of the deflectors is L, 1/2D<L<2/3D. The design of the deflector is simple and reasonable. By changing the gas path of the exhaust gas in the tower, it can effectively prolong the residence time of the exhaust gas in the tower with low resistance, increase the adsorption depth of the adsorbent, and achieve superior adsorption for large-flow exhaust gas. Effect.

Preferably, the adsorbent is selected from any one of silica gel, activated alumina, activated carbon, molecular sieve or a combination thereof, in particular, a silica gel/molecular sieve composite adsorbent is selected, that is, silica gel and molecular sieve are selected according to the types and characteristics of VOCs in the exhaust gas. Mixed in a certain proportion to form a composite adsorbent. The adsorbent is loaded upwards from the uniform pore plate, and the space between the guide plates is filled step by step, and finally filled to a certain height. The wire mesh orifice plate is fixed and pressed tightly on the adsorbent by bolts. It can avoid the boiling and fluidization of the adsorbent and the generation of catalyst powder caused by excessive air flow, thereby effectively prolonging the service life of the adsorbent and ensuring the normal operation of the adsorption tower.

Preferably, the gas-liquid separation tank includes a tank main body, a separation tank inlet pipe arranged on the side wall of the tank main body, a liquid discharge port of the separation tank arranged at the bottom of the tank main body, and a The air outlet of the separation tank and the air outlet pipe of the separation tank arranged in the center of the tank main body, the inlet pipe of the separation tank is connected with the condenser, the liquid discharge port of the separation tank is connected with the liquid storage tank, and the outlet of the separation tank The air pipe is connected to the gas intersection, the center of the gas outlet pipe of the separation tank is provided with a swirl rod, and a number of swirl guide plates are arranged at equal intervals on the outer surface of the gas outlet pipe of the separation tank and the swirl rod. The lower part of the main body of the tank is provided with a gas-liquid separation orifice, as shown in Figure 3, the middle part of the gas-liquid separation orifice is set as an upwardly protruding diversion cover, and the periphery of the diversion cover is provided with a circular arc plate, The arc plate is equidistantly distributed with a number of drain holes of the separation tank, and the liquid drain of the separation tank is connected with a liquid seal device, which can keep a small amount of organic liquid at the bottom of the tank for a long time to form a liquid seal to avoid air leakage.

The organic waste gas enters the tank tangentially from the inlet pipe of the separation tank, flows to the top of the main body of the tank and is discharged through the outlet pipe of the separation tank, which prolongs the time of gas-liquid separation. Under the action of the swirl guide plate on the outer surface of the rod, the high-speed swirl flow, the condensed organic liquid loses kinetic energy after colliding with the tank wall and pipe wall, and adheres to it, thereby realizing the separation from the steering gas. The organic liquid on the tank wall flows to the gas-liquid separation orifice by gravity, and then flows to the liquid storage tank through the liquid outlet of the separation tank for reuse or regular discharge. The gas-liquid separation orifice 3 can promote the swirling gas to turn and enter the gas outlet pipe of the separation tank for deep separation; at the same time, it can avoid excessive sinking of the gas and re-mix with the organic liquid at the bottom of the tank, thereby ensuring a better gas-liquid separation effect.

Preferably, the diversion cover is an arc body, and the top is provided with anti-corrosion rubber. First, the rubber can prevent the corrosion of organic liquids, and second, it can decelerate the gas, increase the residence time of the gas inside the tank, and promote the separation of gas and liquid. The anti-corrosion rubber is polytetrafluoroethylene, and the thickness of the polytetrafluoroethylene is 0.1-1mm.

Preferably, the bottom or top of the outlet pipe of the separation tank is provided with a wire mesh filter layer; the thickness of the wire mesh filter layer is 10-100 mm. The gas separated by cyclone is further separated by the wire mesh layer at the bottom of the outlet pipe, and the wire mesh filter layer is used to prevent the incompletely separated organic liquid from being discharged with the gas. The thickness of the screen filter layer is 10-100mm. Preferably, when the concentration of organic waste gas is high, the screen filter layer is installed on the top of the outlet pipe for easy replacement. Preferably, the thickness of the wire mesh filter layer at the top is 30-100mm. When the concentration of organic waste gas is high, the thickness can be increased to promote the separation effect.

As preferably, the condenser is provided with a liquid ammonia inlet and an ammonia gas outlet, the condenser is a horizontal condenser, and a condensation pipe is arranged in the horizontal condenser, and the liquid ammonia inlet is connected to the The condensing pipe circulates inside. Most of the VOCs in the exhaust gas are cooled and condensed by the condensing agent in the condenser. The condensation process can directly use the existing liquid ammonia in the factory. After the condensation is completed, the vaporized ammonia will be transported to the factory for use.

As preferably, the adsorption tower unit includes a first adsorption tower, a second adsorption tower, a third adsorption tower, and a fourth adsorption tower, and the first adsorption tower, the second adsorption tower, the third adsorption tower, and the fourth adsorption tower The bottom of each is provided with adsorption valve and desorption valve, the tops of the first adsorption tower, the second adsorption tower, the third adsorption tower, and the fourth adsorption tower are all provided with outlet valves, and the first adsorption tower and the second adsorption tower are all provided with outlet valves. Balance valves are arranged between the adsorption towers, between the third adsorption tower and the fourth adsorption tower, and the adsorption valve is located on the pipeline between the gas-liquid separation tank and the adsorption tower unit, passing through the adsorption tower The exhaust gas processed by the unit is controlled by the outlet valve and discharged from the flue gas outlet. When using this device, the VOCs waste gas discharged from the production device in the workshop with high pressure, low concentration, large flow rate and stable gas source is directly treated by adsorption method. The adsorption tower unit is equipped with 4 vertical adsorption towers, which adopt double suction and double removal. When the first adsorption tower and the third adsorption tower are adsorbed, the second adsorption tower and the fourth adsorption tower absorb a certain amount of VOCs. Desorption, so work alternately. When the VOCs exhaust gas discharged from the point source reaches a certain pressure, the air intake control system automatically opens the adsorption valve, and the exhaust gas enters the two adsorption towers from bottom to top for adsorption. The VOCs in the exhaust gas are adsorbed and treated. Exhaust to atmosphere. The adsorption tower has adsorbed a certain amount of VOCs and needs to be desorbed and regenerated. First, the desorption valves of the two adsorption towers to be desorbed are opened, and the pressure is automatically reduced. When the system pressure drops to a certain value, the vacuum pump is automatically started to perform vacuum desorption on the adsorption towers, and the VOCs are completely removed. The desorption gas containing high-concentration VOCs generated during the desorption process is drawn out from the bottom of the adsorption tower by the vacuum pump, and transported to the buffer tank, where it is mixed with the fugitive exhaust VOCs exhaust gas, and VOCs are recovered by condensation method together. Therefore, the process flow of adsorption under pressure and desorption under pressure can be realized through vacuum pump.

The beneficial effects of the present invention have:

(1) The system combines the advantages of the condensation method and the adsorption method. The high-concentration VOCs waste gas is separated by the condensation method, and the low-concentration VOCs waste gas is checked by the adsorption method, so that the organized and unorganized discharge of the VOCs waste gas can be effectively comprehensively treated and formed. It has established a comprehensive treatment process that can operate efficiently and stably, and can meet the latest national emission standards at low investment and operating costs without secondary pollution.

(2) The reasonable structural design of the adsorption tower can effectively prolong the residence time of the waste gas in the tower under lower resistance. With the selected silica gel/molecular sieve composite adsorbent, it has large specific surface area, high adsorption efficiency, good selectivity and high strength. , wear resistance and good regeneration performance, etc., can achieve excellent adsorption effect.

(3) The adsorption tower unit adopts the process flow of adsorption under pressure and decompression under pressure, and cooperates with advanced and reliable automatic control procedures. When desorbing and regenerating the adsorbent, it can not only effectively remove the adsorbed VOCs, but also ensure the adsorption The solvent is stable and in the best working environment; it can efficiently recover valuable VOCs, which can not only avoid environmental pollution, but also effectively reduce the loss of production raw materials and products, and reduce production costs.

(4) The condensing unit is equipped with a buffer tank, which can effectively resist the impact of changes in exhaust gas concentration, flow, pressure, temperature, etc. on the device, and adapt to fluctuations in the concentration of VOCs in fugitive exhaust gas ranging from tens to hundreds of thousands of mg/ ^m3 , The characteristics of frequent flow changes and strong adaptability to working conditions can effectively ensure the continuous and stable operation of the device.

(5) The gas-liquid separation tank adopts a new structural design, which can effectively realize the separation of organic liquid and gas, and prevent the impact of organic liquid on the adsorption tower.

Description of drawings

Fig. 1 embodiment 2 process structure schematic diagram;

The schematic flow chart of Fig. 2 embodiment 1;

Fig. 3 partial enlarged view of adsorption tower unit;

Fig. 4 partial enlarged view of the gas-liquid separation tank;

Figure 5 is a partial enlarged view of the diversion cover of the gas-liquid separation tank;

Fig. 6 is a partially enlarged view of another embodiment of the gas-liquid separation tank.

Reference signs: Fugitive exhaust gas inlet 1, liquid ammonia inlet 2, ammonia gas outlet 3, point source exhaust gas inlet 4, buffer tank 5, blower 6, condenser 7, gas-liquid separation tank 8, separation tank intake pipe 801, separation tank drain port 802, gas-liquid separation orifice plate 803, swirl guide plate 804, swirl rod 805, separation tank outlet pipe 806, screen filter layer 807, separation tank air outlet 808, diversion cover 809, Arc plate 810, separation tank drain hole 811, vacuum pump 9, adsorption tower unit 10, first adsorption tower 11, second adsorption tower 12, third adsorption tower 13, fourth adsorption tower 14, flue gas outlet 15, waste Liquid outlet 16, gas junction 17, adsorption valve 18, desorption valve 19, gas outlet valve 20, balance valve 21, inlet pipe 22, swirl distributor 23, uniform gas orifice plate 24, deflector 25, adsorbent 26, Liquid storage tank 27, wire mesh orifice plate 28, air outlet pipe 29.

Detailed ways

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

Example 1

A high-efficiency comprehensive treatment device for organic waste gas, as shown in Figure 2, includes a buffer tank 5, a blower 6, a condenser 7, a gas-liquid separation tank 8 and an adsorption tower unit 10 sequentially connected through a flue gas pipeline, the gas-liquid separation A gas junction 17 is provided between the tank 8 and the adsorption tower unit 10. The fugitive emission VOCs waste gas collected from the workshop enters the buffer tank 5 from the fugitive emission flue gas inlet 1, and the point source discharge VOCs waste gas passes through the point source discharge gas Inlet 4 enters gas intersection 17, and described gas intersection 17 is connected with adsorption tower unit 10 by adsorption pipeline, and adsorption valve 18 is arranged on described adsorption pipeline, and gas outlet valve 20 is arranged on the gas outlet pipeline at the top of described adsorption tower, The treated fugitive VOCs waste gas and the untreated point source VOCs waste gas are mixed at the gas intersection 17 and then enter the adsorption tower unit 10 for adsorption treatment. After the treatment is completed, the gas outlet valve 20 is opened and discharged through the flue gas outlet 15;

Described vacuum pump 9 and described adsorption tower unit 10 are connected by desorption pipeline, and described desorption pipeline is provided with desorption valve 19, and described vacuum pump 9 is connected with buffer tank 5, and described vacuum pump 9 is described adsorption tower unit 10 The desorption gas then passes into the buffer tank 5 from bottom to top, and the VOCs exhaust gas collected from the workshop is mixed with the desorption gas, and the buffer tank 5 is provided with a pressure sensor (not shown); Both the condenser 7 and the gas-liquid separation tank 8 are connected to the liquid storage tank 27 , and the liquid storage tank 27 is provided with a waste liquid outlet 16 .

For fugitive emission of VOCs waste gas with low pressure and frequent changes in concentration and flow rate, the method of first condensation and then adsorption is used for treatment. The fugitive discharge of VOCs waste gas and the desorbed gas containing high concentration of VOCs generated during the desorption process are mixed in the buffer tank 5 . The pressure sensor in the buffer tank 5 shows that the pressure reaches a certain value, and the blower 6 is started to increase the pressure of the mixed gas to the working pressure, and then transport it from the top of the tank to the condenser 7. Most of the VOCs are cooled and condensed by the condensing agent of the condenser 7. The condensed waste gas is passed into the gas-liquid separation tank 8, the organic liquid is left in the gas-liquid separation tank 8, and the tail gas is passed into the gas junction 17, mixed with the VOCs waste gas discharged from the point source, and then enters the adsorption tower unit Adsorption treatment is carried out, and the organic liquid at the bottom of the condenser and the gas-liquid separation tank flows to the liquid storage tank 27 by itself, and is reused or regularly discharged through the waste liquid outlet 16 .

In summary, this device combines the advantages of the condensation method and the adsorption method. The high-concentration VOCs waste gas is separated by condensation, and the low-concentration VOCs waste gas is checked by adsorption method, so that the VOCs waste gas in the workshop can be effectively and comprehensively treated, forming an efficient and stable operation. The comprehensive treatment process can meet the latest national emission standards with low investment and operating costs, and there is no secondary pollution.

As shown in Figure 3, the adsorption tower unit 10 includes an adsorption tower, an air intake pipe 22, a swirl diffuser 23, an air-uniform orifice plate 24, a deflector plate 25, a silk screen arranged in sequence along the movement direction of the exhaust gas inside the adsorption tower. Orifice plate 28 and air outlet pipe 29, the adsorption tower inner space between described uniform air orifice plate 24 and described wire mesh orifice plate 28 is filled with adsorbent 26;

Described inlet pipe 22 is arranged on the bottom of adsorption tower, and described swirl diffuser 23 is arranged on described inlet pipe 22, and the pipe diameter of the bottom of described swirl diffuser 23 is identical with described inlet pipe 22 and is with The said swirl diffuser 23 is provided with some swirl plates; The distance is greater than 1/6 adsorption tower diameter D, the top diameter of the swirl plate provided on the swirl diffuser 23 does not exceed the adsorption tower diameter D, and the diameter of the uniform gas orifice plate 24 is the same as the adsorption tower diameter D, and the The porosity of the uniform air hole plate 24 is 50-80%.

The exhaust gas that enters the adsorption tower in parallel through the inlet pipe 22 is transformed into a swirling air flow by the swirl diffuser 23, diffuses evenly to the gas uniform orifice plate 24, and then further disperses into the adsorption area in the tower through the gas uniform orifice plate 24. The swirl diffuser 23 can effectively improve the distribution of exhaust gas on the orifice plate, avoid the formation of adsorption dead zone in the tower body, and improve the utilization rate and service life of the adsorbent. The deflectors 25 are arranged at equal intervals on both sides of the tower wall, inclined downward by 10-30°, and the transverse length of the deflectors 25 is L, 1/2D<L<2/3D. The design of the guide plate 25 is simple and reasonable. By changing the gas path of the waste gas in the tower, it can effectively prolong the residence time of the waste gas in the tower with low resistance, increase the adsorption depth of the adsorbent, and achieve superior performance for large-flow waste gas. Adsorption effect.

The adsorbent 26 is selected from silica gel, activated alumina, activated carbon, molecular sieve, or any combination thereof. In particular, silica gel/molecular sieve composite adsorbent is selected, that is, silica gel and molecular sieve are selected according to the type and characteristics of VOCs in the exhaust gas according to a certain amount. Mixed in proportion to form a composite adsorbent. The adsorbent is loaded upwards from the uniform pore plate, and the space between the guide plates is filled step by step, and finally filled to a certain height. The wire mesh orifice plate 28 is fixed and pressed tightly on the adsorbent by bolts. It can avoid the boiling and fluidization of the adsorbent and the generation of catalyst powder caused by excessive air flow, thereby effectively prolonging the service life of the adsorbent and ensuring the normal operation of the adsorption tower. The top diameter of the swirl plate provided on the swirl diffuser 23 is not equal to or less than the tower diameter, the inner diameter of the uniform orifice plate 24 is the same as that of the adsorption tower, and the opening ratio is 50-80%.

As a preferred embodiment, as shown in Fig. 4 and Fig. 5, the gas-liquid separation tank 8 includes a tank main body, a separation tank inlet pipe 801 arranged on the side wall of the tank main body, and a separation tank 801 arranged at the bottom of the tank main body. The tank drain port 802, the separation tank gas outlet 808 arranged on the top of the tank body and the separation tank gas outlet pipe 806 arranged at the inner center of the tank body, the separation tank inlet pipe 801 is connected with the condenser 7, the The liquid outlet 802 of the separation tank is connected to the liquid storage tank 27, the air outlet pipe 806 of the separation tank is connected to the gas junction 17, and a swirl rod 805 is arranged in the center of the air outlet pipe 806 of the separation tank, A number of swirl guide plates 804 are arranged at equal intervals on the outer surface of the gas pipe 806 and the swirl rod 805, and a gas-liquid separation orifice 803 is arranged at the bottom of the tank main body. As shown in Figure 3, the gas-liquid separation The middle part of the orifice plate 803 is set as an upwardly protruding diversion cover 809, and the periphery of the diversion cover 809 is provided with an arc plate 810, and the arc plate 810 is equidistantly distributed with a number of separation tank drain holes 811. The liquid outlet 2 of the separation tank is connected with a liquid seal device, which can keep a small amount of organic liquid at the bottom of the tank for a long time to form a liquid seal to avoid air leakage.

The organic waste gas enters the tank tangentially from the inlet pipe 801 of the separation tank, flows to the top of the main body of the tank and is discharged through the outlet pipe 806 of the separation tank, which prolongs the time of gas-liquid separation. Under the action of the swirl guide plate 804 on the outer surface of the swirl rod 805, the condensed organic liquid loses kinetic energy after colliding with the tank wall and pipe wall, and adheres to it, thereby realizing the separation from the steering gas. The organic liquid on the tank wall self-flows to the gas-liquid separation orifice 803 under the action of gravity, and then flows to the liquid storage tank 27 through the liquid discharge port 802 of the separation tank, and is reused or discharged regularly. The gas-liquid separation orifice 3 can promote the swirling gas to turn into the gas outlet pipe 806 of the separation tank for deep separation; at the same time, it can prevent the gas from sinking excessively and remixing with the organic liquid at the bottom of the tank, thereby ensuring a better gas-liquid separation effect. The diversion cover 809 is an arc body with a layer of anti-corrosion rubber on the top. First, the rubber can prevent the corrosion of organic liquids, and second, it can decelerate the gas, increase the residence time of the gas inside the tank, and promote the separation of gas and liquid. The anti-corrosion rubber is polytetrafluoroethylene, and the thickness of the polytetrafluoroethylene is 0.1-1mm. The bottom of the air outlet pipe 806 of the separation tank is provided with a wire mesh filter layer 807 . The gas separated by cyclone is further separated by the silk screen layer at the bottom of the outlet pipe. The thickness of the screen filter layer 7 is 10-50mm.

As a preferred embodiment, as shown in FIG. 6 , the top of the air outlet pipe 806 of the separation tank is detachably provided with a wire mesh filter layer 7 . When the concentration of organic waste gas is high, it is advisable to install the screen filter layer on the top of the outlet pipe for easy replacement. The thickness of the silk screen filter layer 7 is 30-100mm. When the concentration of organic waste gas is high, the thickness can be increased to promote the separation effect.

As a preferred embodiment, the condenser 7 is provided with a liquid ammonia inlet 2 and an ammonia gas outlet 3, the condenser 7 is a horizontal condenser, and a condensation pipe is arranged in the horizontal condenser, and the liquid ammonia Liquid ammonia is inserted into the inlet 2 to circulate in the condensation pipe. Most of the VOCs in the exhaust gas are cooled and condensed by the condensing agent in the condenser. The condensation process can directly use the existing liquid ammonia in the factory. After the condensation is completed, the vaporized ammonia will be transported to the factory for use.

Example 2

This embodiment only describes the differences from Embodiment 1.

As shown in Figure 1, described adsorption tower unit 10 comprises first adsorption tower 11, second adsorption tower 12, the 3rd adsorption tower 13, the 4th adsorption tower 14, described first adsorption tower 11, second adsorption tower 12 , the bottom of the third adsorption tower 13, the fourth adsorption tower 14 are all provided with adsorption valve 18 and desorption valve 19, the first adsorption tower 11, the second adsorption tower 12, the third adsorption tower 13, the fourth adsorption tower The tops of 14 are all provided with outlet valve 20, between the first adsorption tower 11 and the second adsorption tower 12, between the third adsorption tower 13 and the fourth adsorption tower 14 are all provided with balance valve 21, the balance valve 21 is used to balance the pressure between the two towers. As mentioned above, this device adopts the process flow of adsorption under pressure and decompression under pressure. For example, when the first adsorption tower 11 and the third adsorption tower adsorption 13 are finished and the desorption is about to begin, and the second adsorption tower 12 and the fourth adsorption tower 14 are about to start adsorption after the desorption, the first adsorption tower 11 and the second adsorption tower 11 are opened. The balance valve 21 between the towers 12, between the third adsorption tower 13 and the fourth adsorption tower 14 can realize the depressurization of one tower and the pressurization of the other tower. After the pressure is balanced, the balance valve is closed, and the first and third adsorption The tower opens the desorption valve to further reduce the pressure, and when the pressure drops to a certain value, the vacuum pump is turned on for desorption. The adsorption valve 18 is located on the pipeline between the gas-liquid separation tank 8 and the adsorption tower unit, and the exhaust gas processed by the adsorption tower unit is controlled by the outlet valve 20 and discharged from the flue gas outlet 15; when using this device , For the VOCs waste gas discharged from the production device in the workshop with high pressure, low concentration, large flow rate and stable gas source, the adsorption method is directly used for treatment. The adsorption tower unit is provided with 4 vertical adsorption towers, which adopt double suction and double removal. The adsorption tower of VOCs is desorbed, so it works alternately. When the VOCs exhaust gas discharged from the point source reaches a certain pressure, the air intake control system automatically opens the adsorption valve 18, and the exhaust gas enters the two adsorption towers from bottom to top for adsorption. The VOCs in the exhaust gas are adsorbed and treated. Outlet 15 vents to atmosphere. The adsorption tower has adsorbed a certain amount of VOCs and needs to be desorbed and regenerated. First, the desorption valves 19 of the two adsorption towers to be desorbed are opened, and the pressure is automatically reduced. When the system pressure drops to a certain value, the vacuum pump 9 is automatically started, and the adsorption towers are vacuum desorbed to completely remove VOCs. The desorption gas containing high-concentration VOCs generated in the desorption process is drawn out from the bottom of the adsorption tower by the vacuum pump 9, and transported to the buffer tank 5, and mixed with the VOCs waste gas from fugitive emissions, and the VOCs are recovered through the condensation method together. Therefore, the process flow of adsorption under pressure and desorption under pressure can be realized by the vacuum pump 9 .

Application example

When using this device, the VOCs waste gas is mixed into the buffer tank 5, the pressure sensor in the buffer tank 5 shows that the pressure reaches a certain value, the blower 6 is started, and the mixed gas is boosted to the working pressure, and then automatically The top of the tank is sent to the condenser 7, and most of the VOCs in the exhaust gas are cooled and condensed by the condensing agent of the condenser 7. When the pressure reaches 900-1400kPa, the blower is automatically started, and the mixed gas is boosted to the working pressure (condensing pressure) of 1800-2800kPa (preferably 2600kPa), and then it is transported from the top of the tank to the horizontal condenser. Most (over 90%) VOCs in the exhaust gas are cooled and condensed by the condensing agent in the condensing tube. The system of the present invention is used to treat the VOCs waste gas of the production workshop, and the purification effect is shown in the table below.

According to the disclosure and teaching of the above-mentioned specification, those skilled in the art to which the present invention belongs can also make changes and modifications to the above-mentioned embodiment. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims (10)

1. A high-efficiency comprehensive treatment device for organic waste gas, characterized in that it includes a buffer tank, a blower, a condenser, a gas-liquid separation tank and an adsorption tower unit connected in sequence through a flue gas pipeline, the gas-liquid separation tank and the adsorption tower unit There is a gas junction between the tower units. The fugitive exhaust VOCs waste gas enters the buffer tank from the fugitive emission flue gas inlet, and the point source exhaust VOCs exhaust gas enters the gas junction through the point source exhaust gas inlet. The gas junction passes through the adsorption pipeline. It is connected with the adsorption tower unit, the adsorption pipeline is provided with an adsorption valve, and the gas outlet pipeline at the top of the adsorption tower is provided with an outlet valve, and the treated unorganized exhaust VOCs exhaust gas and the untreated point source exhaust VOCs exhaust gas are in the gas After mixing at the intersection, it enters the adsorption tower unit for adsorption treatment. After the treatment is completed, it is discharged through the flue gas outlet by opening the outlet valve; The adsorption tower unit is connected to a vacuum pump through a desorption pipeline, the desorption pipeline is provided with a desorption valve, the vacuum pump is connected to a buffer tank, and the vacuum pump passes the desorption gas of the adsorption tower unit from bottom to top into the buffer tank, the VOCs exhaust gas collected from the workshop is mixed with the desorption gas, and the buffer tank is provided with a pressure sensor; the condenser and the gas-liquid separation tank are connected to the liquid storage tank, The liquid storage tank is provided with a waste liquid outlet. 2. The treatment device according to claim 1, wherein the adsorption tower unit comprises an adsorption tower, an air intake pipe, a swirl diffuser, an air-distributing orifice plate, and a guide tube arranged in sequence along the movement direction of the exhaust gas inside the adsorption tower. A flow plate, a wire mesh orifice plate and an air outlet pipe, the inner space of the adsorption tower between the uniform air orifice plate and the wire mesh orifice plate is filled with adsorbent. 3. device according to claim 2, is characterized in that, described inlet pipe is arranged on the bottom of adsorption tower, and described swirl diffuser is arranged on described inlet pipe, and the bottom of described swirl diffuser and The diameters of the inlet pipes are the same and communicated with it, and the swirl diffuser is provided with a number of swirl plates; The vertical distance of the flow diffuser is greater than 1/6 of the diameter of the adsorption tower, and the diameter of the top of the swirl plate provided on the swirl diffuser does not exceed the diameter of the adsorption tower, and the diameter of the uniform orifice plate is the same as that of the adsorption tower. The porosity of the homogeneous orifice plate is 50-80%. 4. The device according to claim 2, characterized in that, the adsorbent is any one of silica gel, activated alumina, activated carbon, molecular sieve or a combination thereof, and the screen hole plate is fixed and pressed tightly on the on the adsorbent. 5. The device according to claim 2, wherein the gas-liquid separation tank comprises a tank main body, a separation tank intake pipe arranged on the side wall of the tank main body, a separation tank arranged at the bottom of the tank main body The liquid outlet, the air outlet of the separation tank arranged on the top of the tank main body and the air outlet pipe of the separation tank arranged in the inner center of the tank main body, the air inlet pipe of the separation tank is connected with the condenser, and the liquid discharge port of the separation tank is connected with the condenser. The liquid storage tank is connected, the gas outlet pipe of the separation tank is connected with the gas intersection, the inner center of the gas outlet pipe of the separation tank is provided with a swirl rod, the outer surface of the gas outlet pipe of the separation tank and the swirl rod A number of swirl flow guide plates are arranged at equal intervals on the top. 6. The device according to claim 5, characterized in that, the lower part of the tank main body is provided with a gas-liquid separation orifice, and the middle part of the gas-liquid separation orifice is set as an upwardly protruding diversion cover, and the guide The periphery of the flow cover is provided with an arc plate, and the arc plate is equidistantly distributed with a number of drain holes of the separation tank, and the drain port of the separation tank is connected with a liquid sealing device. 7. The device according to claim 6, wherein the diversion cover is an arc body, and the top is provided with anti-corrosion rubber; the anti-corrosion rubber is polytetrafluoroethylene, and the polytetrafluoroethylene The thickness is 0.1-1mm. 8. The device according to claim 5, 6 or 7, characterized in that a wire mesh filter layer is provided at the bottom or top of the air outlet pipe of the separation tank; the thickness of the wire mesh filter layer is 10-100 mm. 9. The device according to claim 2 or 5, characterized in that the condenser is provided with a liquid ammonia inlet and an ammonia gas outlet, the condenser is a horizontal condenser, and the horizontal condenser is provided with A condensing pipe, the liquefied ammonia is inserted into the inlet of the liquid ammonia to circulate in the condensing pipe. 10. device according to claim 2, is characterized in that, described adsorption tower unit comprises first adsorption tower, second adsorption tower, the 3rd adsorption tower, the 4th adsorption tower, described first adsorption tower, second adsorption tower The bottoms of the adsorption tower, the third adsorption tower, and the fourth adsorption tower are all provided with adsorption valves and desorption valves, and the tops of the first adsorption tower, the second adsorption tower, the third adsorption tower, and the fourth adsorption tower are all provided with Outlet valve, balance valves are arranged between the first adsorption tower and the second adsorption tower, between the third adsorption tower and the fourth adsorption tower, and the adsorption valves are located between the gas-liquid separation tank and the adsorption tower On the pipeline between the units, the exhaust gas treated by the adsorption tower unit is controlled by the outlet valve and discharged from the flue gas outlet.