Chlorinated paraffin tail gas purification treatment device and use method

Abstract

The invention discloses a chlorinated paraffin tail gas purification treatment device and a use method, and relates to the technical field of tail gas purification, the chlorinated paraffin tail gas purification treatment device comprises a gas inlet liquid separation tank, an adsorption module, a condensation evaporation regeneration module and a discharge cylinder, and the adsorption module comprises a liquid paraffin adsorption unit, a resin adsorption unit and an activated carbon adsorption unit; the gas inlet module comprises a gas inlet liquid separation tank, a gas inlet centrifugal machine and a safety release valve, a workshop tail gas inlet pipe connected with a machining workshop is arranged at the top end of the gas inlet liquid separation tank, and the bottom end of the gas inlet liquid separation tank communicates with a gas inlet of the gas inlet centrifugal machine through a pipeline. A pressure detection end used for detecting pressure is arranged between the gas inlet liquid separation tank and the gas inlet centrifugal machine, and a safety release valve is arranged between the gas inlet centrifugal machine and the discharge cylinder, so that during use, through the pretreatment design of the gas inlet liquid separation tank and the gas inlet centrifugal machine, compared with a traditional Roots blower, efficient separation of liquid drops and particle impurities in tail gas is achieved, and the tail gas purification effect is improved. And good conditions are created for subsequent adsorption treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas purification, and in particular to a chlorinated paraffin tail gas purification treatment device and a use method thereof. Background Art

[0002] With the rapid development of the chemical industry, chlorinated paraffin, as an important industrial additive, is widely used in plastics, rubber, coatings and other fields.

[0003] During the production of chlorinated paraffin, the chlorination reaction between chlorine and paraffin produces a large amount of tail gas. This tail gas has a complex composition, mainly including unreacted chlorine, hydrogen chloride, organic chlorinated hydrocarbons (such as chlorinated alkanes and chlorinated alkenes), water vapor, and trace amounts of paraffin vapor. Among them, organic chlorinated hydrocarbons are toxic and highly corrosive. Chlorine and hydrogen chloride not only cause serious environmental pollution but also corrode processing equipment. Water vapor and paraffin vapor can easily cause pipeline blockage, affecting production continuity.

[0004] At present, Roots blowers are widely used in industry to collect chlorinated paraffin tail gas. However, during operation, Roots blowers will cause the tail gas to carry a large amount of lubricating oil and water vapor, resulting in high oil and water content in the collected tail gas. It needs to be transported by large air volume to meet the process requirements. The load on the terminal treatment device is large, and due to the complexity of the tail gas composition, a single treatment technology (such as adsorption, condensation or incineration) is difficult to effectively remove all pollutants at the same time. Summary of the Invention

[0005] In view of the above problems in the prior art, the present invention is proposed.

[0006] Therefore, the present invention aims to provide a chlorinated paraffin tail gas purification and treatment device and method. The problem addressed is that Roots blowers, commonly used in industry to collect chlorinated paraffin tail gas, can carry large amounts of lubricating oil and water vapor with them. This results in high oil and water content, requiring large volumes of air for transport and increasing the load on the end-of-pipe treatment device. Furthermore, due to the complex composition of the tail gas, a single treatment technology cannot effectively remove all pollutants simultaneously.

[0007] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a chlorinated paraffin tail gas purification treatment device comprises an air inlet liquid separator, an adsorption module, a condensation evaporation regeneration module and a discharge cylinder, wherein the adsorption module comprises a liquid paraffin adsorption unit, a resin adsorption unit and an activated carbon adsorption unit;

[0008] The air intake module includes an air intake separator tank, an air intake centrifuge and a safety relief valve. The top of the air intake separator tank is provided with a workshop exhaust gas intake pipe connected to the processing workshop, and the bottom end of the air intake separator tank is connected to the air inlet of the air intake centrifuge through a pipeline, and a pressure detection end for detecting pressure is provided between the air intake separator tank and the air intake centrifuge, a safety relief valve is provided between the air intake centrifuge and the discharge cylinder, and a pressure relief pipe for connecting the air intake centrifuge and the discharge cylinder is installed on the safety relief valve, and a pressure relief hand valve is provided at one end of the pressure relief pipe close to the air intake centrifuge.

[0009] As a preferred embodiment of the chlorinated paraffin tail gas purification treatment device and use method described in the present invention, the liquid paraffin adsorption unit includes a liquid paraffin adsorption tower, the liquid paraffin adsorption tower is connected to the air outlet of the air intake centrifuge through a pipeline, and the pressure relief hand valve is located on the upper pipeline of the liquid paraffin adsorption tower, the bottom end of the liquid paraffin adsorption tower is connected to a liquid paraffin circulation tank through a pipeline, the liquid paraffin circulation tank is connected to a first pump body through a pipeline, and the exhaust port of the first pump body is connected to the liquid paraffin adsorption tower through a pipeline.

[0010] As a preferred embodiment of the chlorinated paraffin tail gas purification treatment device and use method of the present invention, a gas main is provided at the top of the liquid paraffin adsorption tower, a first branch pipe and a second branch pipe are fixedly connected to the gas main, and the second branch pipe is connected to the gas main through the first branch pipe, a third branch pipe is provided at one end of the gas main away from the liquid paraffin adsorption tower, and the gas main is connected to the pressure relief pipe through the third branch pipe.

[0011] As a preferred embodiment of the chlorinated paraffin tail gas purification treatment device and use method of the present invention, the resin adsorption unit includes linearly arranged resin adsorption towers, the resin adsorption towers are filled with resin adsorption columns, and the resin adsorption towers are each provided with a product pipe, and the ends of the product pipes extending outside the resin adsorption towers are connected through a first three-way valve, and the resin adsorption towers are respectively connected in series through a first branch pipe and a second branch pipe.

[0012] As a preferred embodiment of the chlorinated paraffin tail gas purification treatment device and use method of the present invention, the condensation evaporation regeneration module includes a steam mixing tube, and one end of the steam mixing tube is respectively provided with a steam inlet and an air inlet for conveying steam and compressed air, and the other end of the steam mixing tube is connected to one end of the product pipe passing through the resin adsorption tower.

[0013] As a preferred embodiment of the chlorinated paraffin tail gas purification treatment device and use method of the present invention, the condensation and evaporation regeneration module further includes a primary condenser and a secondary condenser, a cooling water supply pipe and a cooling water return pipe are fixedly installed on the primary condenser, and a primary liquid infusion pipe is also provided on the primary condenser, and the end of the primary liquid infusion pipe away from the primary condenser is connected to the product pipe through a first three-way valve.

[0014] As a preferred embodiment of the chlorinated paraffin tail gas purification treatment device and the use method of the present invention, wherein: a first-level drain pipe is further provided between the first-level condenser and the second-level condenser, and the second-level condenser is connected to the first-level condenser through the first-level drain pipe, a chilled water supply pipe and a chilled water return pipe are respectively provided on the second-level condenser, and a second-level infusion pipe and a second-level drain pipe are also fixedly installed on the second-level condenser, and the second-level condenser is connected to the analytical liquid tank through the second-level infusion pipe, and the analytical liquid tank is connected to the dilute acid tank through the second-level drain pipe, and the dilute acid tank is connected to the second pump body through a pipeline, and the exhaust port of the second pump body is provided with a regeneration pipe, and the end of the regeneration pipe away from the second pump body is connected in series with the corresponding product pipe.

[0015] As a preferred embodiment of the chlorinated paraffin tail gas purification treatment device and use method described in the present invention, the activated carbon adsorption unit includes an activated carbon adsorption tower, the top of the activated carbon adsorption tower is connected to the end of the gas main away from the liquid paraffin adsorption tower, the bottom end of the activated carbon adsorption tower is provided with a pipe connected to the pressure relief pipe, and the discharge cylinder is provided with a discharge pipe, and the end of the discharge pipe extending outside the discharge cylinder is provided with a second three-way valve, and the discharge pipe is connected to the pressure relief pipe through the second three-way valve.

[0016] A method for using a chlorinated paraffin tail gas purification treatment device, characterized by comprising the following steps:

[0017] Step 1: When the device is needed, first open the manual valve in front of the air inlet separator tank to allow the tail gas from the chlorination workshop to enter the air inlet separator tank through the air inlet centrifuge. The built-in baffles separate the droplets and particulate impurities entrained in the tail gas. At the same time, the pressure detection end is monitored. If the pressure of the air inlet centrifuge is abnormal, the pressure relief valve of the safety relief valve is opened, and the tail gas is discharged into the discharge cylinder through the pressure relief pipe.

[0018] In step 2, the separated gas is transported to the liquid paraffin adsorption tower through a pipeline, and liquid paraffin is sprayed on the top of the tower to circulate, adsorbing organic matter in the tail gas. The rich liquid is returned to the liquid paraffin circulation tank and re-transported to the top of the tower for circulation through the first pump body. The adsorbed tail gas is discharged from the top of the tower;

[0019] Step 3: The tail gas after liquid paraffin adsorption is introduced into the resin adsorption tower through the branch pipe of the gas main. The operation mode of the resin column is switched according to the concentration at the discharge port. After the resin is saturated with adsorption, steam is introduced through the steam mixing pipe for regeneration. The desorption gas passes through a two-stage condenser and is condensed. The liquid phase enters the desorption liquid tank, and the non-condensable gas returns to the exhaust gas inlet.

[0020] Step 4: After the resin regeneration is completed, the resin bed is sprayed with cooling water for circulation and cooling, and then the resin column is purged with compressed air. The purged exhaust gas is introduced into other resin adsorption towers for treatment, and the blown water enters the cooling water tank;

[0021] Step five: the tail gas after resin adsorption enters the activated carbon adsorption tower through the branch pipe of the gas main, and the purified gas is discharged through the discharge pipe and the second three-way valve to the discharge cylinder. When the device fails, the air intake valve is closed and the tail gas is directly discharged through the bypass pressure relief pipe.

[0022] In summary, the present invention has at least one of the following beneficial effects:

[0023] 1. The present invention realizes efficient separation of liquid droplets and particulate impurities in tail gas through the pretreatment design of air intake liquid separator and air intake centrifuge, compared with the traditional Roots blower, creating good conditions for subsequent adsorption treatment.

[0024] 2. The present invention adopts a three-stage composite process of liquid paraffin adsorption, resin adsorption and activated carbon adsorption. Compared with the traditional single treatment process, it achieves layer-by-layer deep purification of organic matter in the tail gas and ensures the purification effect.

[0025] 3. The present invention, with the help of the regeneration cycle design of the resin adsorption unit, realizes the reuse of the adsorption material, reducing the operating cost and resource consumption of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 It is the fluid trend diagram of the present invention;

[0029] Figure 3 is a process flow chart of the present invention;

[0030] Figure 4 This is a structural diagram of the air intake module of the present invention;

[0031] Figure 5 This is a diagram of the installation structure of the adsorption module and the discharge cylinder of the present invention;

[0032] Figure 6 This is a cross-sectional structural diagram of the liquid paraffin adsorption unit of the present invention:

[0033] Figure 7 This is a cross-sectional structural diagram of the resin adsorption unit of the present invention;

[0034] Figure 8 This is a structural diagram of the condensation evaporation regeneration module of the present invention.

[0035] Description of reference numerals:

[0036] 1. Inlet separator tank; 101. Workshop exhaust gas inlet pipe; 102. Pressure detection terminal; 2. Inlet centrifuge; 3. Liquid paraffin adsorption tower; 4. Safety relief valve; 401. Pressure relief pipe; 402. Pressure relief hand valve; 5. Gas main; 501. First branch pipe; 502. Second branch pipe; 503. Third branch pipe; 6. Liquid paraffin circulation tank; 7. First pump body; 8. Resin adsorption tower; 801. Resin adsorption column; 802. Product pipe; 803. First three-way valve; 9. Steam mixing pipe; 901. Steam inlet; 902 , air inlet; 10, activated carbon adsorption tower; 11, first-stage condenser; 1101, cooling water supply pipe; 1102, cooling return water pipe; 1103, first-stage infusion pipe; 1104, first-stage drainage pipe; 12, second-stage condenser; 1201, refrigeration water supply pipe; 1202, refrigeration return water pipe; 1203, second-stage infusion pipe; 1204, second-stage drainage pipe; 13, analytical liquid tank; 1301, regeneration pipe; 14, dilute acid tank; 15, second pump body; 16, discharge cylinder; 1601, discharge pipe; 1602, second three-way valve. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] The embodiment of the invention discloses a water quality sampling and detection device for environmental protection.

[0039] Example 1

[0040] Reference Figure 1-8, which is the first embodiment of the present invention, provides a chlorinated paraffin tail gas purification treatment device and a method of use, the chlorinated paraffin tail gas purification treatment device includes an air intake separator 1, an adsorption module, a condensation evaporation regeneration module and a discharge cylinder 16, and the adsorption module includes a liquid paraffin adsorption unit, a resin adsorption unit and an activated carbon adsorption unit. The air intake module includes an air intake separator 1, an air intake centrifuge 2 and a safety relief valve 4. The top of the air intake separator 1 is provided with a workshop tail gas intake pipe 101 connected to the processing workshop, and the bottom end of the air intake separator 1 is connected to the air inlet of the air intake centrifuge 2 through a pipeline, and a pressure detection device is provided between the air intake separator 1 and the air intake centrifuge 2. A safety relief valve 4 is provided between the pressure detection end 102, the air intake centrifuge 2 and the discharge cylinder 16, and a pressure relief pipe 401 for connecting the air intake centrifuge 2 and the discharge cylinder 16 is installed on the safety relief valve 4, and a pressure relief hand valve 402 is provided at one end of the pressure relief pipe 401 close to the air intake centrifuge 2. The air intake separator 1 can collect the exhaust gas generated in the processing workshop through the workshop exhaust gas intake pipe 101 and perform gas-liquid separation. When it is not recycled for a long time or the device fails, the air intake valve on the workshop exhaust gas intake pipe 101 in the equipment must be closed, and the bypass pressure relief pipe 401 is opened to discharge to the discharge cylinder 16. The safety relief valve 4 can cooperate with the pressure detection end 102 to monitor the pressure changes in the device in real time for timely regulation.

[0041] The liquid paraffin adsorption unit includes a liquid paraffin adsorption tower 3, which is connected to the air outlet of the air inlet centrifuge 2 through a pipeline, and a pressure relief valve 402 is located on the upper pipeline of the liquid paraffin adsorption tower 3. The bottom end of the liquid paraffin adsorption tower 3 is connected to a liquid paraffin circulation tank 6 through a pipeline, and the liquid paraffin circulation tank 6 is connected to a first pump body 7 through a pipeline, and the exhaust port of the first pump body 7 is connected to the liquid paraffin adsorption tower 3 through a pipeline. The liquid paraffin adsorption tower 3 is model T501 and is equipped with a packing. The tail gas passes through the liquid paraffin adsorption tower, and most of the organic matter in the tail gas is absorbed and then discharged from the top of the tower. The circulating liquid paraffin is forced to circulate through P502A / B, entering from the top of the tower and exiting from the bottom of the tower. The oil-washed circulating liquid paraffin returns to the liquid paraffin circulation tank 6 of model V501, and the residual gas is sent to the liquid paraffin adsorption tower 3 through the first pump body 7. The circulating liquid paraffin uses liquid paraffin, the main components of which are C14~C15, and uses the principle of like dissolves like to adsorb organic matter in the tail gas.

[0042] A gas main pipe 5 is provided at the top of the liquid paraffin adsorption tower 3, to which a first branch pipe 501 and a second branch pipe 502 are fixedly connected, and the second branch pipe 502 is connected to the gas main pipe 5 through the first branch pipe 501. A third branch pipe 503 is provided at one end of the gas main pipe 5 away from the liquid paraffin adsorption tower 3, and the gas main pipe 5 is connected to the pressure relief pipe 401 through the third branch pipe 503.

[0043] The resin adsorption unit includes a linearly arranged resin adsorption tower 8, in which resin adsorption columns 801 are installed, and each resin adsorption tower 8 is provided with a product pipe 802, and one end of the product pipe 802 extending outside the resin adsorption tower 8 is connected through a first three-way valve 803, and the resin adsorption towers 8 are connected in series through a first branch pipe 501 and a second branch pipe 502 respectively. A single column of the resin adsorption tower 8 is filled with 2 cubic meters of resin, and the models are T-0101, T-0102 and T-0103 respectively. The exhaust gas transported by the first branch pipe 501 and the second branch pipe 502 can be transported to different resin adsorption towers 8 respectively, thereby realizing a two-in-one-standby or one-in-two-standby operation mode.

[0044] The condensation and evaporation regeneration module includes a steam mixing tube 9, and one end of the steam mixing tube 9 is provided with a steam inlet 901 and an air inlet 902 for conveying steam and compressed air respectively, and the other end of the steam mixing tube 9 is connected to the product pipe 802 through one end of the resin adsorption tower 8, and the organic matter in the resin adsorption tower 8 can be brought out from the resin pores by steam.

[0045] The condensation and evaporation regeneration module also includes a primary condenser 11 and a secondary condenser 12. A cooling water supply pipe 1101 and a cooling return water pipe 1102 are fixedly installed on the primary condenser 11, and a primary liquid infusion pipe 1103 is also provided on the primary condenser 11. The end of the primary liquid infusion pipe 1103 away from the primary condenser 11 is connected to the product pipe 802 through a first three-way valve 803. The primary condenser 11 and the secondary condenser 12 can cool the hot steam and gaseous organic matter to below 60°C and below 35°C respectively through the circulation of cooling water and chilled water.

[0046] A primary drain pipe 1104 is provided between the primary condenser 11 and the secondary condenser 12, and the secondary condenser 12 is connected to the primary condenser 11 through the primary drain pipe 1104. A refrigerated water supply pipe 1201 and a refrigerated water return pipe 1202 are provided on the secondary condenser 12, and a secondary infusion pipe 1203 and a secondary drain pipe 1204 are fixedly installed on the secondary condenser 12. The secondary condenser 12 is connected to the analytical liquid tank 13 through the secondary infusion pipe 1203. The analytical liquid tank 13 is connected to the analytical liquid tank 13 through the secondary The discharge pipe 1204 is connected to the dilute acid tank 14, and the dilute acid tank 14 is connected to the second pump body 15 through a pipeline, and the exhaust port of the second pump body 15 is provided with a regeneration pipe 1301, and the end of the regeneration pipe 1301 away from the second pump body 15 is connected in series with the corresponding product pipe 802. The liquid phase after cooling treatment enters the analysis liquid tank 13, and then slowly discharged into the dilute acid tank 14. A small amount of non-condensable gas that is not completely condensed is merged into the exhaust gas inlet pipe and passes through the second pump body 15, and enters the resin adsorption tower 8 again for adsorption.

[0047] The activated carbon adsorption unit includes an activated carbon adsorption tower 10. The top of the activated carbon adsorption tower 10 is connected to the end of the gas main 5 away from the liquid paraffin adsorption tower 3. The bottom end of the activated carbon adsorption tower 10 is provided with a pipe connected to the pressure relief pipe 401, and the discharge cylinder 16 is provided with a discharge pipe 1601. The discharge pipe 1601 extends to one end outside the discharge cylinder 16 and is provided with a second three-way valve 1602. The discharge pipe 1601 is connected to the pressure relief pipe 401 through the second three-way valve 1602. The activated carbon adsorption tower 10 is model T502 and is filled with activated carbon. The exhaust gas enters from the upper part of T502. After passing through the activated carbon adsorption bed, the organic matter in the exhaust gas is adsorbed, thereby reducing the content of organic matter in the exhaust gas to below 40 mg / m3. Finally, the exhaust gas is discharged from the lower part of the adsorption tower and enters the 25-meter-high exhaust cylinder 16 for discharge.

[0048] During the purification process of chlorinated paraffin tail gas, the tail gas from the chlorination workshop is sent to the air inlet separator 1 through the air inlet centrifuge 2, and the entrained droplets and particulate impurities are initially separated by the built-in baffle. After the separated gas is monitored by the pressure detection end 102, it is transported to the liquid paraffin adsorption tower 3 through a pipeline. At the same time, when the pressure of the air inlet centrifuge 2 exceeds 0.8MPa, the pressure relief manual valve 402 of the safety relief valve 4 is automatically opened, and the tail gas is discharged into the discharge cylinder 16 through the pressure relief pipe 401. In addition, when the device fails, the air inlet valve is closed, and the tail gas is directly discharged through the bypass pressure relief pipe 401. Therefore, compared with the traditional Roots blower, the oil and water content of the collected tail gas is disclosed, and the load on the subsequent treatment of the device is relatively small;

[0049] The tail gas from the chlorination workshop enters the liquid paraffin adsorption tower 3 of model T501 through the K501A / B air intake centrifuge 2. Most of the organic matter in the tail gas is adsorbed by the liquid paraffin. After the tail gas has been adsorbed by the liquid paraffin, most of the volatile organic matter is separated from the tail gas. The tail gas then enters the resin adsorption unit for further treatment. According to the principle of like dissolves like, the liquid paraffin selectively adsorbs organic matter such as organic chlorinated hydrocarbons and paraffin vapor to form a rich liquid that is refluxed to the liquid paraffin circulation tank 6. The rich liquid is then re-delivered to the top of the tower for recycling via the first pump body 7. The tail gas after adsorption is discharged from the top of the tower, and the organic matter content is greatly reduced.

[0050] The tail gas discharged from the liquid paraffin adsorption tower 3 enters the resin adsorption tower 8 through the first branch pipe 501 and the second branch pipe 502 of the gas main 5. The resin adsorption unit adopts a two-in-one standby or one-in-two-standby operation mode. There are three resin adsorption towers 8 in total. When the operation starts, the resin column T-0101 is started for adsorption. When the non-methane total hydrocarbon value at the discharge port reaches 40mg / m 3 When the total non-methane hydrocarbon value at the discharge port reaches 40 mg / m 3When the resin column T-0102 adsorption and resin column T-0103 adsorption in series are started, the resin column T-0101 enters the regeneration stage. When the non-methane total hydrocarbon value at the discharge port reaches 40 mg / m 3 When the total non-methane hydrocarbon value at the discharge port reaches 40 mg / m 3 When the adsorption is complete, restart the resin column T-0101 and resin column T-0102 in series. Repeat this cycle to achieve the resin column series adsorption operation.

[0051] Single resin column adsorption: When the operation starts, start the resin column T-0101 adsorption, when the total non-methane hydrocarbon value at the discharge port reaches 40mg / m 3 When the resin column T-0102 is started to adsorb, the resin column T-0101 enters the regeneration stage. When the non-methane total hydrocarbon value at the discharge port reaches 40 mg / m 3 When the resin column T-0103 is started to adsorb, the resin column T-0102 enters the regeneration stage. When the non-methane total hydrocarbon value at the discharge port reaches 40 mg / m 3 When the adsorption of resin column T-0101 is restarted, resin column T-0103 enters the regeneration stage. Repeating this cycle can realize single resin column adsorption operation.

[0052] Regeneration: After the resin is saturated with adsorption, 0.1MPa steam is introduced through the steam mixing pipe 9 for regeneration. The time is 1 hour. The organic matter is brought out from the resin pores by the steam and enters the two-stage condenser for condensation. The first-stage condenser 11 cools the hot steam and gaseous organic matter to below 60°C, and then cools it to below 35°C through the second-stage condenser 12. The liquid phase enters the analytical liquid tank 13 and is then slowly discharged into the dilute acid tank 14. The small amount of non-condensable gas that is not completely condensed is merged into the exhaust gas inlet pipe and enters the resin adsorption tower 8 again for adsorption.

[0053] Cooling: After the resin is regenerated, cooling water is used to spray the resin and circulate it to quickly cool the resin bed. The cooling water outlet passes through the primary condenser 11 and the secondary condenser 12 to cool the temperature to room temperature and returns to the cooling water tank. The heat is eventually taken out of the system by the external circulating water. The duration is 60 minutes.

[0054] Purging: Use compressed air to purge the resin column to dry the surface free water in the resin for 60 minutes. The waste gas from the process enters another resin adsorption tower 8 for adsorption, and the blown water enters the cooling water tank to prevent the free water in the pores from causing an increase in system pressure drop.

[0055] The tail gas enters the activated carbon adsorption tower 10 through the third branch pipe 503 of the gas main 5, and then enters the activated carbon adsorption tower T502. In the process of passing through the adsorbent bed, the organic matter therein is adsorbed on the surface and pores of the adsorbent, thereby achieving separation from the air or nitrogen. The purified gas after adsorption is connected to the 25-meter-high discharge cylinder 16 through the discharge pipe 1601 and the second three-way valve 1602. Thus, through the multiple composite adsorption process, the purification treatment of the chlorinated paraffin tail gas is more sufficient compared with the traditional single purification process.

[0056] A method for using a chlorinated paraffin tail gas purification treatment device comprises the following steps:

[0057] Step 1: When the device is needed, the manual valve in front of the air inlet separator 1 is first opened to allow the tail gas from the chlorination workshop to be fed into the air inlet separator 1 through the air inlet centrifuge 2. The droplets and particulate impurities carried in the tail gas are separated by the built-in baffles. At the same time, the pressure detection end 102 is monitored. If the pressure of the air inlet centrifuge 2 is abnormal, the pressure relief manual valve 402 of the safety relief valve 4 is opened, and the tail gas is discharged into the discharge cylinder 16 through the pressure relief pipe 401;

[0058] Step 2: The separated gas is then transported to the liquid paraffin adsorption tower 3 through a pipeline. Liquid paraffin is sprayed on the top of the tower to circulate organic matter in the tail gas. The rich liquid flows back to the liquid paraffin circulation tank 6 and is re-transported to the top of the tower for circulation through the first pump body 7. The adsorbed tail gas is discharged from the top of the tower.

[0059] Step 3: The tail gas after liquid paraffin adsorption is introduced into the resin adsorption tower 8 through the branch pipe of the gas main 5. The operation mode of the resin column is switched according to the concentration at the discharge port. After the resin is saturated with adsorption, steam is introduced through the steam mixing pipe 9 for regeneration. The desorption gas is condensed by a two-stage condenser, and the liquid phase enters the desorption liquid tank 13. The non-condensable gas returns to the exhaust gas inlet.

[0060] Step 4: After the resin regeneration is completed, the resin bed is sprayed with cooling water for circulation and cooling, and then the resin column is purged with compressed air. The purged exhaust gas is introduced into other resin adsorption towers 8 for treatment, and the blown water enters the cooling water tank;

[0061] In step five, the tail gas after resin adsorption enters the activated carbon adsorption tower 10 through the branch pipe of the gas main 5, and the purified gas is discharged through the discharge pipe 1601 and the second three-way valve 1602 to the discharge cylinder 16. When the device fails, the air intake valve is closed and the tail gas is directly discharged through the bypass pressure relief pipe 401.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A chlorinated paraffin tail gas purification treatment device, characterized in that: It comprises an air inlet separator tank (1), an adsorption module, a condensation evaporation regeneration module and a discharge cylinder (16), wherein the adsorption module comprises a liquid paraffin adsorption unit, a resin adsorption unit and an activated carbon adsorption unit; The air intake module comprises an air intake separator tank (1), an air intake centrifuge (2) and a safety relief valve (4); the top of the air intake separator tank (1) is provided with a workshop tail gas intake pipe (101) connected to a processing workshop, and the bottom of the air intake separator tank (1) is connected to the air intake port of the air intake centrifuge (2) through a pipeline, and a pressure detection end (102) for detecting pressure is provided between the air intake separator tank (1) and the air intake centrifuge (2), a safety relief valve (4) is provided between the air intake centrifuge (2) and the discharge cylinder (16), and a pressure relief pipe (401) for connecting the air intake centrifuge (2) and the discharge cylinder (16) is installed on the safety relief valve (4), and a pressure relief hand valve (402) is provided at one end of the pressure relief pipe (401) close to the air intake centrifuge (2).

2. The chlorinated paraffin tail gas purification treatment device according to claim 1, characterized in that: The liquid paraffin adsorption unit includes a liquid paraffin adsorption tower (3), the liquid paraffin adsorption tower (3) is connected to the air outlet of the air intake centrifuge (2) through a pipeline, and the pressure relief valve (402) is located on the upper pipeline of the liquid paraffin adsorption tower (3), the bottom end of the liquid paraffin adsorption tower (3) is connected to the liquid paraffin circulation tank (6) through a pipeline, the liquid paraffin circulation tank (6) is connected to the first pump body (7) through a pipeline, and the exhaust port of the first pump body (7) is connected to the liquid paraffin adsorption tower (3) through a pipeline.

3. The chlorinated paraffin tail gas purification treatment device according to claim 2, characterized in that: A gas main pipe (5) is provided at the top of the liquid paraffin adsorption tower (3), a first branch pipe (501) and a second branch pipe (502) are fixedly connected to the gas main pipe (5), and the second branch pipe (502) is connected to the gas main pipe (5) through the first branch pipe (501), and a third branch pipe (503) is provided at one end of the gas main pipe (5) away from the liquid paraffin adsorption tower (3), and the gas main pipe (5) is connected to the pressure relief pipe (401) through the third branch pipe (503).

4. The chlorinated paraffin tail gas purification treatment device according to claim 1, characterized in that: The resin adsorption unit comprises linearly arranged resin adsorption towers (8), wherein the resin adsorption towers (8) are filled with resin adsorption columns (801), and each of the resin adsorption towers (8) is provided with a product pipe (802), and one end of the product pipe (802) extending outside the resin adsorption tower (8) is connected via a first three-way valve (803), and the resin adsorption towers (8) are connected in series via a first branch pipe (501) and a second branch pipe (502), respectively.

5. The chlorinated paraffin tail gas purification treatment device according to claim 1, characterized in that: The condensation evaporation regeneration module includes a steam mixing tube (9), and one end of the steam mixing tube (9) is provided with a steam inlet (901) and an air inlet (902) for conveying steam and compressed air, respectively, and the other end of the steam mixing tube (9) is connected to one end of the product tube (802) passing through the resin adsorption tower (8).

6. The chlorinated paraffin tail gas purification treatment device according to claim 5, characterized in that: The condensation evaporation regeneration module further comprises a primary condenser (11) and a secondary condenser (12), wherein a cooling water supply pipe (1101) and a cooling water return pipe (1102) are fixedly mounted on the primary condenser (11), respectively; a primary liquid infusion pipe (1103) is further provided on the primary condenser (11), and an end of the primary liquid infusion pipe (1103) away from the primary condenser (11) is connected to the product pipe (802) via a first three-way valve (803).

7. The chlorinated paraffin tail gas purification treatment device according to claim 6, characterized in that: A primary drain pipe (1104) is further provided between the primary condenser (11) and the secondary condenser (12), and the secondary condenser (12) is connected to the primary condenser (11) through the primary drain pipe (1104). A refrigerated water supply pipe (1201) and a refrigerated water return pipe (1202) are respectively provided on the secondary condenser (12), and a secondary liquid infusion pipe (1203) and a secondary drain pipe (1204) are also fixedly installed on the secondary condenser (12). The secondary condenser (12) is connected to a decomposition liquid tank (13) via a secondary liquid infusion pipe (1203), the decomposition liquid tank (13) is connected to a dilute acid tank (14) via a secondary liquid discharge pipe (1204), the dilute acid tank (14) is connected to a second pump body (15) via a pipeline, and a regeneration pipe (1301) is provided at the exhaust port of the second pump body (15), and the end of the regeneration pipe (1301) away from the second pump body (15) is connected in series with a corresponding product pipe (802).

8. The chlorinated paraffin tail gas purification treatment device according to claim 1, characterized in that: The activated carbon adsorption unit comprises an activated carbon adsorption tower (10), the top of the activated carbon adsorption tower (10) is connected to one end of the gas main (5) away from the liquid paraffin adsorption tower (3), the bottom end of the activated carbon adsorption tower (10) is provided with a pipeline connected to the pressure relief pipe (401), and the discharge cylinder (16) is provided with a discharge pipe (1601), and the end of the discharge pipe (1601) extending outside the discharge cylinder (16) is provided with a second three-way valve (1602), and the discharge pipe (1601) is connected to the pressure relief pipe (401) through the second three-way valve (1602).

9. A method for using a chlorinated paraffin tail gas purification treatment device, which is applied to the chlorinated paraffin tail gas purification treatment device as claimed in claim 8, characterized in that: The following steps are involved: Step 1: When the device needs to be used, the manual valve in front of the air inlet separator (1) is first opened to allow the tail gas from the chlorination workshop to be fed into the air inlet separator (1) through the air inlet centrifuge (2). The droplets and particulate impurities carried in the tail gas are separated by the built-in baffle. At the same time, the pressure detection end (102) is monitored. If the pressure of the air inlet centrifuge (2) is abnormal, the pressure relief manual valve (402) of the safety relief valve (4) is opened, and the tail gas is discharged into the discharge cylinder (16) through the pressure relief pipe (401); In step 2, the separated gas is transported to the liquid paraffin adsorption tower (3) through a pipeline, and liquid paraffin is sprayed on the top of the tower to circulate, adsorbing organic matter in the tail gas. The rich liquid flows back to the liquid paraffin circulation tank (6), and is transported to the top of the tower for circulation again through the first pump body (7). The adsorbed tail gas is discharged from the top of the tower; Step 3: The tail gas after the liquid paraffin is adsorbed is introduced into the resin adsorption tower (8) through the branch pipe of the gas transmission main pipe (5), and the operation mode of the resin column is switched according to the concentration of the discharge port. After the resin is saturated with adsorption, steam is introduced through the steam mixing pipe (9) for regeneration. The desorption gas is condensed through the two-stage condenser (11, 12), and the liquid phase enters the desorption liquid tank (13). The non-condensable gas returns to the exhaust gas inlet; Step 4: After the resin regeneration is completed, the resin bed is sprayed with cooling water for circulation and cooling, and the resin column is purged with compressed air. The purged waste gas is introduced into other resin adsorption towers (8) for treatment, and the blown water enters the cooling water tank; In step five, the tail gas after resin adsorption enters the activated carbon adsorption tower (10) through the branch pipe of the gas main pipe (5), and the purified gas is discharged through the discharge pipe (1601) and the second three-way valve (1602) to the discharge cylinder (16). When the device fails, the air inlet valve is closed and the tail gas is directly discharged through the bypass pressure relief pipe (401).

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