A method for purifying tail gas from coke oven gas by microcrystal adsorption regeneration

Abstract

The present invention belongs to the technical field of coking coal gas microcrystal adsorption process, and specifically relates to a purification treatment method for coke oven gas microcrystal adsorption regeneration tail gas. The purification treatment method is that when the microcrystal adsorption tower starts to regenerate, the generated regeneration tail gas is sprayed and washed with circulating liquid and circulating oil in sequence; the blockage is judged according to the pressure loss of the purified coke oven gas being greater than 2000Pa, and the spraying amount of circulating oil / circulating liquid is adjusted according to the gas volume of the purified coke oven gas and the temperature of the regeneration tail gas at the horizontal tube primary cooler, and the temperature range of the microcrystal adsorption regeneration tail gas from 30°C to 200°C is controlled to 55°C to 100°C by spraying, and the temperature index of the horizontal tube primary cooler is stabilized. The purification treatment method simultaneously achieves the dual effects of regeneration tail gas washing and temperature control.

Description

Technical Field

[0001] The invention belongs to the technical field of coking coal gas microcrystal adsorption technology, and specifically relates to a purification treatment method for coke oven gas microcrystal adsorption regeneration tail gas. Background Art

[0002] The coke oven gas microcrystal adsorption process uses microcrystal adsorption materials to adsorb and remove harmful impurities such as tar, naphthalene, ammonia and H2S in coke oven gas to obtain pure purified coke oven gas, which meets the flue gas emission requirements of coke oven gas furnace users.

[0003] Table 1: Various indicators of coke oven gas microcrystal adsorption

[0004]

[0005] During the microcrystal adsorption process, harmful impurities such as tar, naphthalene, ammonia, H2S, etc. are gradually enriched. After an adsorption cycle of about 5 days, the impurity adsorption of the adsorption tower tends to be saturated. In order to prevent impurities from breaking through the bed layer and causing the external coke oven gas to be unqualified, it is necessary to regenerate the coke oven gas microcrystal adsorption. The tar, naphthalene, ammonia, H2S and other impurities enriched in the bed layer during the adsorption process are analyzed and regenerated to ensure that it has the conditions for normal adsorption again in the next adsorption cycle.

[0006] The regeneration of coke oven gas microcrystal adsorption is divided into two steps: heating analysis and cold blowing: (1) Heating analysis is to regularly use purified coke oven gas (dosage: 3000m 3 / h-4000m 3 / h) to regenerate and analyze the adsorption tower. The regenerated gas passes through a booster fan with a bypass and is heated to 120°C with 0.4MPa saturated steam, and then is heated to 200°C with an electric heater to heat and analyze the impurities enriched in the adsorption tower.

[0007] (2) When the outlet temperature of the regeneration bed reaches about 180°C, the heating and decomposition operation is terminated and the cold blowing stage is entered. Use purified coke oven gas (dosage: 3000m 3 / h-4000m 3 / h) regenerate the adsorption tower and perform cold blowing operation. When the outlet temperature of the adsorption bed drops to 50°C, the cold blowing is terminated and the adsorption tower enters the standby state. This part of tail gas carries impurities into the upper gas pipeline of the horizontal tube primary cooler in the blast cooling process and re-enters the gas purification system for gas purification.

[0008] The above regeneration process has the following defects at various stages: (1) Initial heating and analysis stage and final cold blowing stage: The air inlet of the transverse tube primary cooler is raw coal gas emitted from the coke oven, which contains high concentrations of impurities such as tar and naphthalene, and the temperature is between 75°C and 95°C. The temperature of the regenerated tail gas in the initial heating and analysis stage of the microcrystalline adsorption tower regeneration and the final cold blowing stage is only about 30°C. When the regenerated tail gas enters the gas pipeline at the top of the transverse tube primary cooler, there is a large temperature difference with the raw coal gas at the inlet. This part of the regenerated tail gas forms a local temperature drop at the inlet of the transverse tube primary cooler, and impurities such as tar, naphthalene, ammonia and H2S are very easy to accumulate in the pipeline below 50°C, causing systemic process flow blockage and leading to safety accidents.

[0009] (2) The end of heating and analysis and the beginning of cold blowing: The temperature of the regenerated tail gas in this stage can reach over 200°C, which is also a large temperature difference with the raw gas at the inlet. The higher temperature of the regenerated tail gas directly increases the cooling load of the cross-tube primary cooler, causing the gas collection temperature of the primary cooler to be too high, affecting the purification effect of the entire gas recovery system. At the same time, a large temperature difference stress is formed on the gas pipeline connected to the upper section of the cross-tube primary cooler, damaging the pipeline and causing gas leakage, leading to process and safety accidents. In addition, impurities such as tar, naphthalene, ammonia and H2S will aggravate the corrosion of equipment in a high temperature environment exceeding 120°C.

[0010] In summary, the above situations will affect the normal regeneration effect of microcrystal adsorption, and cannot guarantee the normal, continuous and stable operation of the coke oven gas microcrystal adsorption process. How to effectively stabilize the regeneration gas temperature and eliminate the problem of regeneration gas impurity blockage is the key to ensuring the industrial application of the microcrystal adsorption process in the field of coke oven gas fine desulfurization. Summary of the invention

[0011] The purpose of the present invention is to provide a purification method for the tail gas of coke oven gas by microcrystal adsorption regeneration in view of the above-mentioned defects of the current microcrystal adsorption regeneration, which can achieve the dual effects of regeneration tail gas washing and temperature control. The blockage effect of impurities such as tar and naphthalene is eliminated to ensure the continuous production of the process. The temperature of the regenerated tail gas after spraying is controlled at 55°C-100°C, and the operating temperature of the cross-tube primary cooler is stabilized while eliminating the temperature difference stress, and at the same time eliminating the blockage effect of impurities such as tar and naphthalene and the influence of temperature difference stress.

[0012] The technical scheme of the present invention is: a method for purifying and treating tail gas of microcrystalline adsorption regeneration of coke oven gas, when a microcrystalline adsorption tower starts to regenerate, the generated regeneration tail gas is sequentially subjected to circulating liquid spray washing and circulating oil spray washing; the blockage is judged according to the pressure loss of the purified coke oven gas being greater than 2000Pa, and the spraying amount of circulating oil / circulating liquid is adjusted according to the gas volume of the purified coke oven gas and the temperature of the regeneration tail gas at the horizontal tube primary cooler, and the temperature range of the microcrystalline adsorption regeneration tail gas from 30°C to 200°C is controlled to 55°C to 100°C by spraying, so as to stabilize the temperature index of the horizontal tube primary cooler; the specific steps are as follows:

[0013] (1) Circulating liquid washing of regenerated tail gas: The regenerated tail gas generated by the regeneration of the microcrystalline adsorption tower enters the horizontal tube pre-cooler through the regenerated tail gas pipeline connected to the bottom of the microcrystalline adsorption tower. A circulating liquid temperature control nozzle and a circulating liquid washing nozzle are arranged in the pipeline section of the regenerated tail gas pipeline located at the bottom of the microcrystalline adsorption tower. The circulating liquid temperature control nozzle and the circulating liquid washing nozzle are externally connected to a circulating liquid delivery pipe and a circulating liquid pump, and a circulating liquid outlet valve is arranged on the circulating liquid delivery pipe; the circulating liquid is delivered to the circulating liquid temperature control nozzle and the circulating liquid washing nozzle through the circulating liquid pump and the circulating liquid delivery pipe. The circulating liquid is sprayed inside the regenerated tail gas pipeline through the circulating liquid temperature control nozzle and the circulating liquid washing nozzle to form a three-dimensional fan surface, and the incoming regenerated tail gas is temperature controlled and impurities are washed respectively; the circulating liquid after washing enters the tower residual liquid collection pool of the microcrystalline adsorption tower, and the surplus circulating residual liquid enters the mechanical clarification tank;

[0014] (2) Circulating oil washing of regenerated exhaust gas: A circulating oil temperature control nozzle and a circulating oil washing nozzle are arranged at the position where the regenerated exhaust gas enters the transverse tube pre-cooler. The circulating oil temperature control nozzle and the circulating oil washing nozzle are externally connected to a circulating oil delivery pipe and a circulating oil pump, and a circulating oil outlet valve is arranged on the circulating oil delivery pipe; the circulating oil is delivered to the circulating oil temperature control nozzle and the circulating oil washing nozzle through the circulating oil pump and the circulating oil delivery pipe, and the circulating oil is sprayed inside the upper gas pipeline through the circulating oil temperature control nozzle and the circulating oil washing nozzle to form a three-dimensional fan surface, which respectively controls the temperature and washes impurities of the incoming regenerated exhaust gas; the circulating oil washing liquid enters the transverse tube pre-cooler, mixes with the circulating oil in the transverse tube pre-cooler and enters the circulating oil tank.

[0015] The circulating liquid temperature control nozzle, the circulating liquid washing nozzle, the circulating oil temperature control nozzle and the circulating oil washing nozzle are all petal-shaped. The conventional nozzle has poor ability to wash and flush impurities such as naphthalene and tar in the pipeline. The present invention provides an adjustable new petal-shaped nozzle, which sprays the tail gas generated by the regeneration of the coke oven gas microcrystal adsorption device in a comprehensive manner without dead angles, thereby achieving the function of fully washing impurities from the tail gas.

[0016] The four nozzles are of a four-leaf clover-shaped five-nozzle type or a six-leaf clover-shaped seven-nozzle type.

[0017] The main structure of the four nozzles is that one end uses a seamless steel pipe, and the other end uses a seamless steel pipe processed into a petal-shaped nozzle; the inner diameter of the seamless steel pipe is selected from one of 15mm, 20mm, 25mm, 32mm, 40mm and 50mm, and the corresponding lengths are 75mm, 100mm, 150mm, 200mm, 250mm, 300mm respectively, and the wall thickness of the seamless steel pipe is determined according to the pressure level of the spraying circulating oil / circulating liquid; the inner diameter of the seamless steel pipe used for processing the petal-shaped nozzle is selected from one of 15mm, 20mm, 25mm, 32mm, 40mm and 50mm, and the corresponding nozzle heights are 30mm, 35mm, 40mm, 45mm, 50mm, 55mm respectively.

[0018] The inner diameter of the steel pipe used in the processing of the four-leaf clover-shaped five-nozzle nozzle is 15mm-25mm; the inner diameter of the steel pipe used in the processing of the six-leaf clover-shaped seven-nozzle nozzle is greater than 32mm.

[0019] The spraying pressure of the nozzle is 0.4MPa-0.6MPa. The use of this pressure range can enhance the extension strength of the five intersecting three-dimensional spraying fans formed by the four-leaf clover-shaped nozzle spraying and the seven intersecting three-dimensional spraying fans formed by the six-leaf clover-shaped nozzle spraying.

[0020] The four nozzles are connected to the circulating oil / circulating liquid delivery pipe by a hyperbolic pipe, wherein the inner diameter of the connecting neck is 2 / 3 of the nozzle diameter, and the length of the hyperbolic pipe is 1.5 times the nozzle height; the connection is made by welding.

[0021] The circulating liquid temperature control nozzle and the circulating oil temperature control nozzle form an angle of 15° to 30° with the incoming regeneration tail gas, thereby enhancing the temperature control effect of the nozzle.

[0022] The circulating liquid washing nozzle and the circulating oil washing nozzle form an angle of 105° to 120° with the incoming regeneration tail gas, thereby enhancing the effect of "forward" cleaning of the pipe wall and removing impurities in the pipeline when the nozzle sprays.

[0023] The circulating liquid is hot ammonia water; the circulating oil is mainly a mixture of tar and hot ammonia water.

[0024] When the inner diameter of the circulating liquid nozzle and / or circulating oil nozzle is 15 mm to 25 mm, the nozzle is in the shape of a four-leaf clover, and the spraying port forms 5 cross-three-dimensional spraying sectors.

[0025] When the inner diameter of the circulating liquid nozzle and / or circulating oil nozzle is greater than 32 mm, the nozzle is in the shape of a six-leaf clover, and the spraying port forms 7 cross-three-dimensional spraying fans.

[0026] The beneficial effects of the present invention are as follows: the purification treatment method of the coke oven gas microcrystalline adsorption regeneration tail gas of the present invention is equipped with a pipeline built-in new circulating oil / circulating liquid nozzle at the bottom of the microcrystalline adsorption tower and the position entering the horizontal tube primary cooler, spraying the circulating oil / circulating liquid at about 80°C, and when the microcrystalline adsorption tower starts to regenerate, the generated regeneration tail gas is sequentially sprayed and washed with the circulating liquid and the circulating oil, and at the same time, the temperature range of the microcrystalline adsorption regeneration tail gas from 30°C to 200°C is controlled to 55°C to 100°C by spraying, and the temperature index of the horizontal tube primary cooler is stabilized. Stabilize the regeneration gas temperature, reduce the influence of temperature difference stress, stabilize the process production temperature; wash impurities such as tar and naphthalene, eliminate the blockage influence of impurities such as tar and naphthalene, and ensure the continuous production of the process. The temperature range of the microcrystal adsorption regeneration tail gas is controlled from 30℃~200℃ to 55℃~100℃. Compared with the temperature of the raw gas at the inlet of the cross-tube pre-cooler of 75℃~95℃, this method reduces the temperature difference between the regenerated tail gas and the raw gas at the inlet of the cross-tube pre-cooler from 45℃~125℃ to 20℃~40℃. The temperature of the regenerated tail gas entering the cross-tube pre-cooler tends to be stable, eliminating the influence of temperature difference stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the device for the coke oven gas microcrystal adsorption regeneration tail gas purification treatment method of the present invention.

[0028] Figure 2 It is a working state diagram of circulating liquid spraying in a specific implementation method.

[0029] Figure 3 It is a schematic diagram of the structure of the four-leaf clover-shaped five-nozzle nozzle of Example 1-3.

[0030] Figure 4 It is a schematic diagram of the structure of the six-leaf clover-shaped seven-nozzle nozzle of Example 4-6.

[0031] Among them, 1 is the raw gas transmission pipeline, 2 is the raw gas inlet to the primary cooler, 3 is the horizontal pipe primary cooler, 4 is the microcrystalline adsorption tower regeneration fan, 5 is the purified coke oven gas steam heater, 6 is the purified coke oven gas electric heater, 7 is the purified coke oven gas inlet flow detection, 8 is the purified coke oven gas inlet pressure detection, 9 is the microcrystalline adsorption tower, 10 is the purified coke oven gas inlet temperature detection, 11 is the regeneration tail gas outlet flow detection, 12 is the regeneration tail gas pipeline, 13 is the circulating oil pump, 14 is the circulating oil outlet valve, 15 is the circulating oil temperature control nozzle / circulating oil washing nozzle, 16 is the tower residual liquid collection pool, 17 is the tower residual liquid collection pool valve, 18 is the circulating liquid pump, 19 is the circulating liquid outlet valve, 20 is the circulating liquid temperature control nozzle / circulating liquid washing nozzle, 21 is the circulating liquid transmission pipeline, and 22 is the connecting neck. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings.

[0033] The purification treatment method of the coke oven gas microcrystalline adsorption regeneration tail gas is as follows: when the microcrystalline adsorption tower 9 starts to regenerate, the generated regeneration tail gas is sprayed and washed with circulating liquid and circulating oil in sequence; the blockage is judged according to the pressure loss of the purified coke oven gas being greater than 2000Pa, and the spraying amount of the circulating oil / circulating liquid is adjusted according to the gas volume of the purified coke oven gas and the temperature of the regeneration tail gas at the horizontal tube primary cooler 3, and the temperature range of the microcrystalline adsorption regeneration tail gas from 30°C to 200°C is controlled to 55°C to 100°C by spraying, and the temperature index of the horizontal tube primary cooler 3 is stabilized; the specific steps are as follows:

[0034] (1) Circulating liquid washing of regenerated tail gas: The regenerated tail gas generated by the regeneration of the microcrystalline adsorption tower 9 enters the cross-tube primary cooler 3 through the regenerated tail gas pipeline 12 connected to the bottom of the microcrystalline adsorption tower 9. A circulating liquid temperature control nozzle and a circulating liquid washing nozzle 20 are arranged in the pipeline section of the regenerated tail gas pipeline 12 located at the bottom of the microcrystalline adsorption tower 9. The circulating liquid temperature control nozzle and the circulating liquid washing nozzle are externally connected to a circulating liquid delivery pipe 21 and a circulating liquid pump 18. A circulating liquid outlet valve 19 is arranged on the circulating liquid delivery pipe 21. The circulating liquid spraying amount is adjusted by the circulating liquid outlet valve 19 to ensure that the washing energy of the regenerated tail gas is force; the circulating liquid is delivered to the circulating liquid temperature control nozzle and the circulating liquid washing nozzle through the circulating liquid pump 18 and the circulating liquid delivery pipe 21, and the circulating liquid is sprayed inside the regeneration tail gas pipeline 12 through the circulating liquid temperature control nozzle and the circulating liquid washing nozzle to form a three-dimensional fan surface, the circulating liquid temperature control nozzle forms an angle of 15° to 30° with the incoming regeneration tail gas, and the circulating liquid washing nozzle forms an angle of 105° to 120° with the incoming regeneration tail gas, respectively controlling the temperature and washing impurities of the incoming regeneration tail gas; the circulating liquid after washing enters the tower residual liquid collection pool of the microcrystalline adsorption tower, and the surplus circulating residual liquid enters the mechanical clarification tank;

[0035] (2) Circulating oil washing of regenerated tail gas: A circulating oil temperature control nozzle and a circulating oil washing nozzle 15 are arranged at the position where the regenerated tail gas enters the transverse pipe primary cooler 3. The circulating oil temperature control nozzle and the circulating oil washing nozzle are externally connected to a circulating oil delivery pipe and a circulating oil pump 13. A circulating oil outlet valve 14 is arranged on the circulating oil delivery pipe. The circulating oil outlet valve 14 is used to adjust the circulating oil spraying amount to ensure the washing capacity of the regenerated tail gas. The circulating oil is delivered to the circulating oil pump 13 and the circulating oil delivery pipe. The circulating oil is sprayed inside the upper gas pipeline through the oil temperature control nozzle and the circulating oil washing nozzle to form a three-dimensional fan-shaped surface. The circulating oil temperature control nozzle forms an angle of 15° to 30° with the incoming regenerated exhaust gas, and the circulating oil washing nozzle forms an angle of 105° to 120° with the incoming regenerated exhaust gas, respectively controlling the temperature and washing impurities of the incoming regenerated exhaust gas; the circulating oil washing liquid enters the horizontal tube pre-cooler, mixes with the circulating oil in the horizontal tube pre-cooler and enters the circulating oil tank.

[0036] The circulating liquid is hot ammonia water; the circulating oil is mainly a mixture of tar and hot ammonia water.

[0037] The main structure of the above four nozzles is that one end uses a seamless steel pipe, and the other end uses a seamless steel pipe processed into a petal-shaped nozzle. The inner diameter of the seamless steel pipe can be 15mm, 20mm, 25mm, 32mm, 40mm, and 50mm, and the corresponding lengths are 75mm, 100mm, 150mm, 200mm, 250mm, and 300mm, respectively. The wall thickness of the seamless steel pipe is determined according to the pressure level of the spraying circulating oil / circulating liquid. The inner diameter of the seamless steel pipe used to process the petal-shaped nozzle can be 15mm, 20mm, 25mm, 32mm, 40mm, and 50mm, and the corresponding nozzle heights are 30mm, 35mm, 40mm, 45mm, 50mm, and 55mm, respectively.

[0038] Example 1

[0039] The inner diameter of the seamless steel pipe used for the circulating liquid temperature control nozzle, circulating liquid washing nozzle, circulating oil temperature control nozzle and circulating oil washing nozzle is 15mm, and a four-leaf clover-shaped five-nozzle type is adopted. The spraying nozzle forms 5 cross-three-dimensional spraying fans, and the corresponding nozzle height is 30mm. The inner diameter of the seamless steel pipe used at the other end is 15mm, and the corresponding length is 75mm. The wall thickness of the seamless steel pipe is determined according to the pressure level of the spraying circulating oil / circulating liquid. The spraying pressure of the nozzle is 0.4MPa~0.6MPa. The use of this pressure range can enhance the extension strength of the 5 cross-three-dimensional spraying fans formed by the four-leaf clover-shaped nozzle spraying.

[0040] The four nozzles are connected to the circulating oil / circulating liquid delivery pipe by a hyperbolic pipe, wherein the inner diameter of the connecting neck is 2 / 3 of the nozzle diameter, and the length of the hyperbolic pipe is 1.5 times the nozzle height; the connection is made by welding.

[0041] When the microcrystalline adsorption device starts to regenerate, the circulating oil pump and circulating liquid pump are turned on to spray the circulating oil / circulating liquid. Through pressure control and installation angle, the circulating oil / circulating liquid spraying amount is adjusted and the gas volume of the regenerated tail gas is fine-tuned to ensure the circulating oil / circulating liquid spraying amount, so as to achieve the cleaning effect of impurities such as tar and naphthalene. At the same time, the regenerated tail gas temperature is controlled, the cooling pressure of the cross-tube primary cooler is reduced, and the operating temperature index of the cross-tube primary cooler is stabilized to meet the process operation index requirements.

[0042] Example 2

[0043] The inner diameter of the seamless steel pipe used for the circulating liquid temperature control nozzle, circulating liquid washing nozzle, circulating oil temperature control nozzle and circulating oil washing nozzle is 20mm, and a four-leaf clover-shaped five-nozzle type is adopted, and the spraying nozzle forms 5 cross-three-dimensional spraying fans, and the corresponding nozzle height is 35mm. The inner diameter of the seamless steel pipe used at the other end is 20mm, and the corresponding length is 100mm. The wall thickness of the seamless steel pipe is determined according to the pressure level of the sprayed circulating oil / circulating liquid.

[0044] Example 3

[0045] The inner diameter of the seamless steel pipe used for the circulating liquid temperature control nozzle, circulating liquid washing nozzle, circulating oil temperature control nozzle and circulating oil washing nozzle is 25mm, and a four-leaf clover-shaped five-nozzle type is adopted, and the spraying nozzle forms 5 cross-three-dimensional spraying fans, and the corresponding nozzle height is 40mm. The inner diameter of the seamless steel pipe used at the other end is 25mm, and the corresponding length is 150mm. The wall thickness of the seamless steel pipe is determined according to the pressure level of the sprayed circulating oil / circulating liquid.

[0046] Example 4

[0047] The inner diameter of the seamless steel pipe used for the circulating liquid temperature control nozzle, circulating liquid washing nozzle, circulating oil temperature control nozzle and circulating oil washing nozzle is 32mm, and the six-leaf clover-shaped seven-nozzle type is adopted. The spraying nozzle forms 7 cross-three-dimensional spraying fans, and the corresponding nozzle height is 45mm. The inner diameter of the seamless steel pipe used at the other end is 32mm, and the corresponding length is 200mm. The wall thickness of the seamless steel pipe is determined according to the pressure level of the sprayed circulating oil / circulating liquid.

[0048] Example 5

[0049] The inner diameter of the seamless steel pipe used for the circulating liquid temperature control nozzle, circulating liquid washing nozzle, circulating oil temperature control nozzle and circulating oil washing nozzle is 40mm, and the six-leaf clover-shaped seven-nozzle type is adopted. The spraying nozzle forms 7 cross-three-dimensional spraying fans, and the corresponding nozzle height is 50mm. The inner diameter of the seamless steel pipe used at the other end is 40mm, and the corresponding length is 250mm. The wall thickness of the seamless steel pipe is determined according to the pressure level of the sprayed circulating oil / circulating liquid.

[0050] Example 6

[0051] The inner diameter of the seamless steel pipe used for the circulating liquid temperature control nozzle, circulating liquid washing nozzle, circulating oil temperature control nozzle and circulating oil washing nozzle is 50mm, and the six-leaf clover-shaped seven-nozzle type is adopted. The spraying nozzle forms 7 cross-three-dimensional spraying fans, and the corresponding nozzle height is 55mm. The inner diameter of the seamless steel pipe used at the other end is 50mm, and the corresponding length is 300mm. The wall thickness of the seamless steel pipe is determined according to the pressure level of the sprayed circulating oil / circulating liquid.

Claims

1. A method for purifying tail gas from coke oven gas by microcrystal adsorption regeneration, characterized in that: When the microcrystalline adsorption tower begins to regenerate, the generated regenerated tail gas is sequentially washed by spraying with circulating liquid and circulating oil; the blockage is judged according to the pressure loss of the purified coke oven gas being greater than 2000Pa, and the spraying amount of circulating oil and circulating liquid is adjusted according to the gas volume of the purified coke oven gas and the temperature of the regenerated tail gas at the horizontal tube primary cooler. The temperature range of the microcrystalline adsorption regenerated tail gas from 30℃ to 200℃ is controlled to 55℃ to 100℃ by spraying, and the temperature index of the horizontal tube primary cooler is stabilized; The circulating liquid is hot ammonia water; the circulating oil is a mixture of tar and hot ammonia water; The specific steps are as follows: (1) Circulating liquid washing of regenerated tail gas: The regenerated tail gas generated by the regeneration of the microcrystalline adsorption tower enters the horizontal tube pre-cooler through the regenerated tail gas pipeline connected to the bottom of the microcrystalline adsorption tower. A circulating liquid temperature control nozzle and a circulating liquid washing nozzle are arranged in the pipeline section of the regenerated tail gas pipeline located at the bottom of the microcrystalline adsorption tower. The circulating liquid temperature control nozzle and the circulating liquid washing nozzle are externally connected to a circulating liquid delivery pipe and a circulating liquid pump, and a circulating liquid outlet valve is arranged on the circulating liquid delivery pipe; the circulating liquid is delivered to the circulating liquid temperature control nozzle and the circulating liquid washing nozzle through the circulating liquid pump and the circulating liquid delivery pipe. The circulating liquid is sprayed inside the regenerated tail gas pipeline through the circulating liquid temperature control nozzle and the circulating liquid washing nozzle to form a three-dimensional fan, and the incoming regenerated tail gas is temperature controlled and impurities are washed respectively; the circulating liquid after washing enters the tower residual liquid collection pool of the microcrystalline adsorption tower, and the surplus circulating residual liquid enters the mechanical clarification tank; (2) Circulating oil washing of regenerated tail gas: a circulating oil temperature control nozzle and a circulating oil washing nozzle are arranged at the position where the regenerated tail gas enters the transverse tube pre-cooler. The circulating oil temperature control nozzle and the circulating oil washing nozzle are externally connected to a circulating oil delivery pipe and a circulating oil pump. A circulating oil outlet valve is arranged on the circulating oil delivery pipe. The circulating oil is delivered to the circulating oil temperature control nozzle and the circulating oil washing nozzle through the circulating oil pump and the circulating oil delivery pipe. The circulating oil is sprayed inside the upper gas pipeline through the circulating oil temperature control nozzle and the circulating oil washing nozzle to form a three-dimensional fan surface, which controls the temperature of the incoming regenerated tail gas and washes impurities respectively. The circulating oil washing liquid enters the transverse tube pre-cooler, mixes with the circulating oil in the transverse tube pre-cooler and enters the circulating oil tank. The circulating liquid temperature control nozzle and the circulating oil temperature control nozzle form an angle of 15° to 30° with the incoming regeneration tail gas; The circulating liquid washing nozzle and the circulating oil washing nozzle form an angle of 105° to 120° with the incoming regeneration tail gas.

2. The method for purifying tail gas from coke oven gas by microcrystal adsorption regeneration according to claim 1, characterized in that: The circulating liquid temperature control nozzle, the circulating liquid washing nozzle, the circulating oil temperature control nozzle and the circulating oil washing nozzle are all in the shape of petals.

3. The method for purifying tail gas from coke oven gas by microcrystal adsorption regeneration according to claim 2, characterized in that: The four nozzles are of a four-leaf clover-shaped five-nozzle type or a six-leaf clover-shaped seven-nozzle type.

4. The method for purifying tail gas from coke oven gas by microcrystal adsorption regeneration according to claim 2, characterized in that: The structure of the four nozzles is that one end uses a seamless steel pipe, and the other end uses a seamless steel pipe processed into a petal-shaped nozzle; the inner diameter of the seamless steel pipe is selected from one of 15mm, 20mm, 25mm, 32mm, 40mm and 50mm, and the corresponding lengths are 75mm, 100mm, 150mm, 200mm, 250mm, 300mm, and the wall thickness of the seamless steel pipe is determined according to the pressure level of the spraying circulating oil / circulating liquid; the inner diameter of the seamless steel pipe used for processing the petal-shaped nozzle is selected from one of 15mm, 20mm, 25mm, 32mm, 40mm and 50mm, and the corresponding nozzle heights are 30mm, 35mm, 40mm, 45mm, 50mm, 55mm.

5. The method for purifying tail gas from coke oven gas by microcrystal adsorption regeneration according to claim 3, characterized in that: The inner diameter of the steel pipe used in the processing of the four-leaf clover-shaped five-nozzle nozzle is 15mm-25mm; the inner diameter of the steel pipe used in the processing of the six-leaf clover-shaped seven-nozzle nozzle is greater than 32mm.

6. The method for purifying tail gas from coke oven gas by microcrystal adsorption regeneration according to claim 3, characterized in that: The spraying pressure of the nozzle is 0.4MPa-0.6MPa.

7. The method for purifying tail gas from coke oven gas by microcrystal adsorption regeneration according to claim 2, characterized in that: The four nozzles are connected to the circulating oil / circulating liquid delivery pipe by a hyperbolic pipe, wherein the inner diameter of the connecting neck is 2 / 3 of the nozzle diameter, and the length of the hyperbolic pipe is 1.5 times the nozzle height; the connection is made by welding.

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