CN111068492B - Coking tail gas treatment process and device - Google Patents
Coking tail gas treatment process and device Download PDFInfo
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- CN111068492B CN111068492B CN201811215023.9A CN201811215023A CN111068492B CN 111068492 B CN111068492 B CN 111068492B CN 201811215023 A CN201811215023 A CN 201811215023A CN 111068492 B CN111068492 B CN 111068492B
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Abstract
The invention discloses a coking tail gas treatment process and a coking tail gas treatment device, which are used for solving the problems that the existing delayed coking device has water vapor and malodorous gas pollution, and secondary pollution is caused by tail gas VOC and coke powder discharged along with the tail gas. The method comprises the following steps that coke pool tail gas, coke tower discharged steam, coke tower tail gas and tail gas generated by other equipment in a coking device enter a tail gas treatment tower gas-liquid separation section for gas-liquid separation, gas-phase coking tail gas rises to a desulfurization section and is in countercurrent contact with absorption liquid entering from the upper part of the desulfurization section for desulfurization, the coking tail gas continues to rise to a desaturation section after desulfurization, the coking tail gas comes out from the top of a tail gas treatment tower after desaturation to remove VOC and then is discharged, rich absorption liquid is pumped out and pressurized and then returns to the upper part of the desulfurization section, waste liquid after failure is sent out to a treatment unit, washing water containing solid particles in the tail gas treatment tower downwards enters a settling section, washing sewage containing the solid particles comes out from the bottom of the tail gas treatment tower, clarified washing water is pumped out from a washing water extraction hopper at the lower part of the tail gas treatment tower and is recycled as circulating washing water after pressurization.
Description
Technical Field
The invention belongs to the field of coking tail gas treatment in the petroleum processing process, and relates to a coking tail gas treatment process and a coking tail gas treatment device.
Background
The delayed coking process is an important residual oil processing process in petroleum processing flow. The raw materials are heated to about 500 ℃ by a heat exchange and coking furnace, and then enter a coke tower to carry out thermal cracking reaction and condensation reaction, and oil gas and solid coke are generated in the coke tower. Oil gas generated by the thermal cracking reaction enters a fractionating tower through an oil gas line at the top of the coke tower and is separated into rich gas and fractions such as naphtha, diesel oil, wax oil and the like. Solid coke is deposited in the coke drum and periodically decoked to the coke pool.
In the coking process, high-pressure water is generally adopted for drilling and coke cutting, and the cut and crushed coke blocks and the high-pressure water enter a coke pool through a chute. After standing and dewatering in the coke pool, the coke is sent out of the device, and the coke cutting water is recycled after precipitation and filtration. Although the cooling steps such as steam blowing, water supply, coke soaking and the like are carried out before decoking, the temperature in the coke tower is still high during decoking, and part of high-pressure water is vaporized, so that water vapor above the coke pool is full during decoking; the coke is enriched with sulfides in the raw materials, and malodorous gas around the coke pool, mainly hydrogen sulfide, diffuses; petroleum coke contains volatile components, so that the problem of VOC pollution around the petroleum coke is caused; during the coke standing dehydration process, the moisture of the upper layer coke is lost, and the coke powder flies with the wind and is spread around the coke pool to form dust pollution. After the coke tower top cover is opened in the decoking operation, water vapor and foul gas also escape from the coke tower top. In addition, a small amount of malodorous gas or hydrocarbon gas is also leaked out during the evacuation of other normal-pressure equipment in the coking device, and due to the four types of pollution, the delayed coking device is often the worst place of the production environment of the whole refinery, and measures are necessary to treat the pollution and improve the working environment.
CN2808275Y discloses a malodor treatment device, which technical solution is: the device comprises an absorption tower, an air supply device, an absorption tower storage tank, a catalytic oxidation tower and a hydraulic jet absorber, and is mainly used for chemically absorbing substances such as hydrogen sulfide, mercaptan and the like by using acid or alkali liquor and oxidizing organic sulfur by using thixotropic activated carbon. The odor treatment device can treat high-flow, fixed, burst-type and high-temperature odor, can be used for treating stably-discharged, low-flow and durable odor sources, and can be used for treating odor sources which have relatively high requirements and are close to residential areas. However, the technical process is complex, the investment is high, the problem of solvent saturation treatment exists no matter after sulfide is absorbed by acid or alkali liquor, and secondary pollution is easy to occur again.
Chinese patent ZL 2013 0555900.3 discloses a coking tail gas treatment device, which uses a draught fan to generate suction force to draw out coke pool tail gas and coke tower top tail gas. Coke powder is removed from coke pool tail gas through spraying, water vapor is eliminated through further cooling of a quenching facility, then the coke pool tail gas is mixed with coke tower top tail gas to enter the bottom of a tail gas deodorization tower, the coke tower top tail gas reversely contacts with an absorbent entering the top of the tower to absorb malodorous gas such as hydrogen sulfide, and the purified tail gas is emptied through a draught fan. The main components of the patent tail gas treatment system comprise: (1) a coke pool tail gas collecting cover; (2) a tail gas washing facility; (3) tail gas quenching nozzle; (4) a coke drum tail gas collection facility; (5) a tail gas deodorization tower; (6) an induced draft fan. The technology can solve the problems of coke powder and stink pollution of the tail gas of the closed coke pool and the tail gas of the coke drum, but the technology does not solve the problem of VOC pollution in the tail gas, does not have treatment measures for tail gas of other equipment in the device, and does not have treatment measures for pressure test discharge of steam of the coke drum.
Disclosure of Invention
The invention aims to provide a coking tail gas treatment process and a coking tail gas treatment device, which are used for solving the problems of water vapor and malodorous gas pollution, tail gas VOC (volatile organic compounds) and coke powder discharge with tail gas to cause secondary pollution and tail gas leakage of devices and other equipment in the conventional delayed coking device coke pool and coke tower. The coking tail gas in the invention refers to coke drum tail gas, coke pool tail gas, coke drum steam discharge, tail gas generated by other equipment in a coking device and the like. The invention can fundamentally eliminate the four pollution problems and improve the production working environment of the delayed coking device.
The invention provides a coking tail gas treatment process which is characterized by comprising the following steps:
1) The tail gas of the coke pool directly enters a gas-liquid separation section of a tail gas treatment tower for washing and cooling, or enters the gas-liquid separation section of the tail gas treatment tower after being washed and cooled, the steam discharged from the coke tower enters the gas-liquid separation section of the tail gas treatment tower after being cooled, and the tail gas of the coke tower and the tail gas generated by other equipment in the coking device directly enter the gas-liquid separation section of the tail gas treatment tower;
2) The material flow in the step 1) is subjected to gas-liquid separation in a gas-liquid separation section of a tail gas treatment tower, gas-phase coking tail gas rises to a desulfurization section and is in countercurrent contact with absorption liquid entering from the upper part of the desulfurization section to be desulfurized, the coking tail gas after desulfurization continues to rise to a desaturation section, the coking tail gas after desaturation comes out from the top of the tail gas treatment tower, VOC (volatile organic compounds) is removed and then is discharged, rich absorption liquid is extracted from a desulfurization section oil collecting tank outlet below the desulfurization section and returns to the upper part of the desulfurization section after pressurization, waste liquid after failure is sent to a treatment unit for treatment, washing water containing solid particles in the tail gas treatment tower enters a settling section downwards, washing sewage containing solid particles comes out from the bottom of the tail gas treatment tower after settling separation, clarified washing water is extracted from a washing water extraction hopper at the lower part of the tail gas treatment tower and is used as circulating washing water after pressurization for recycling.
The coking tail gas treatment process is further technically characterized in that: the coke tower discharge steam and fresh washing water are mixed in a discharge steam quenching facility, and the mixture enters a gas-liquid separation section of a tail gas treatment tower after being cooled, and preferably enters the gas-liquid separation section of the tail gas treatment tower along the tangential direction. The bleed steam quench means is preferably a venturi spray condenser.
The coking tail gas treatment process is further technically characterized in that: the coke pool tail gas is washed by circulating washing water in a tail gas washing facility, and enters a gas-liquid separation section of the tail gas treatment tower together with circulating washing water after being cooled, and preferably enters the gas-liquid separation section of the tail gas treatment tower along the tangential direction.
The coking tail gas treatment process is further technically characterized in that: the coke pool tail gas is washed and cooled by a part of circulating washing water in a tail gas washing facility, then enters a gas-liquid separation section of the tail gas treatment tower together with the circulating washing water, preferably enters the gas-liquid separation section of the tail gas treatment tower along the tangential direction, and the other part of the circulating washing water enters the gas-liquid separation section of the tail gas treatment tower to further wash and cool the coke pool tail gas.
The coking tail gas treatment process is further technically characterized in that: and the coke pool tail gas directly enters a gas-liquid separation section of a tail gas treatment tower, and is washed and cooled by circulating washing water.
The coking tail gas treatment process is further technically characterized in that: the off-gas scrubbing means is preferably a venturi scrubber.
The coking tail gas treatment process is further technically characterized in that: and the desaturated coking tail gas is discharged from the top of the tail gas treatment tower, is conveyed to a heating furnace blower through a draught fan, is used as heating furnace air distribution for combustion to remove VOC, and is emptied along with the heating furnace flue gas.
The invention provides a coking tail gas treatment device, which is used for the coking tail gas treatment process. The technical scheme of the coking tail gas treatment device is as follows.
The utility model provides a coking tail gas processing apparatus which characterized in that: the coking tail gas treatment device comprises a tail gas treatment tower, a discharged steam quenching facility and a tail gas washing facility, wherein the tail gas treatment tower sequentially comprises a desaturation section, a desulfurization section, a gas-liquid separation section and a settling section from top to bottom, a desulfurization section oil collecting tank is arranged below the desulfurization section in the tail gas treatment tower, a coke pool tail gas injection pipeline, a coke tower discharged steam injection pipeline, coke tower tail gas and a tail gas injection pipeline generated by other equipment in a coking device are arranged at the middle lower part of the tail gas treatment tower, the coke pool tail gas injection pipeline is communicated with the gas-liquid separation section of the tail gas treatment tower through the tail gas washing facility, the coke tower discharged steam injection pipeline is communicated with the gas-liquid separation section of the tail gas treatment tower through the discharged steam quenching facility, and the top of the discharged steam quenching facility is provided with a fresh washing water injection pipeline, the tail gas of the coke tower and the tail gas injection pipeline generated by other equipment in the coking device are directly communicated with a gas-liquid separation section of a tail gas treatment tower, a washing sewage extraction pipeline is arranged at the bottom of the tail gas treatment tower, a washing water extraction hopper is arranged at the lower part of the settling section and is communicated with an inlet of a washing water circulating pump through the washing water extraction pipeline, an outlet of the washing water circulating pump is communicated with a tail gas washing facility, an absorption liquid injection pipeline is arranged above a desulfurization section of the tail gas treatment tower, a desulfurization section oil collection tank extraction port is arranged below the desulfurization section oil collection tank, the desulfurization section oil collection tank extraction port is communicated with an inlet of the absorption liquid circulating pump through a desulfurization section oil collection tank extraction pipeline, an outlet of the absorption liquid circulating pump is communicated with the absorption liquid injection pipeline and a waste liquid extraction pipeline, a desaturated coking tail gas pipeline is arranged at the top of the tail gas treatment tower, and the desaturated coking tail gas pipeline is connected with the VOC treatment facility.
The coking tail gas treatment device is further technically characterized in that: the bleed steam quench facility is disposed on the vent gas treatment tower.
The coking tail gas treatment device is further technically characterized in that: the middle lower part of the tail gas treatment tower is sequentially provided with a coke tower tail gas injection pipeline, a coke pool tail gas injection pipeline and a coke tower discharge steam injection pipeline from top to bottom, wherein the coke tower tail gas injection pipeline is generated by other equipment in the coking device.
The coking tail gas treatment device is further technically characterized in that: the tail gas washing facility is arranged on the tail gas treatment tower, and preferably, the tail gas washing facility is arranged on the tail gas treatment tower in a tangent mode.
The coking tail gas treatment device is further technically characterized in that: the coking tail gas treatment device also comprises a spraying facility which is arranged below the oil collecting tank of the desulfurization section in the tail gas treatment tower and above the coke pool tail gas injection pipeline, and the spraying facility is communicated with the outlet of the washing water circulating pump through a washing water pipeline.
The coking tail gas treatment device is further technically characterized in that: coking tail gas processing apparatus still includes the draught fan, desaturation back coking tail gas pipeline and draught fan entry intercommunication, and the draught fan export links to each other with VOC processing facility, and the preferred emergency blow-down pipeline that is equipped with on the pipeline between draught fan export and the VOC processing facility.
The coking tail gas treatment device is further technically characterized in that: the tail gas washing facility is a Venturi scrubber.
The coking tail gas treatment device is further technically characterized in that: the bleed steam quench facility is a venturi injection condenser.
The coking tail gas treatment device is further technically characterized in that: the bleed steam quench facility is tangentially disposed on the tail gas treatment column.
The invention also provides a second coking tail gas treatment device, which is used for the coking tail gas treatment process. The technical scheme of the second coking tail gas treatment device is as follows.
The utility model provides a coking tail gas processing apparatus which characterized in that: the coking tail gas treatment device comprises a tail gas treatment tower, a discharge steam quenching facility and a spraying facility, wherein the tail gas treatment tower sequentially comprises a desaturation section, a desulfurization section, a gas-liquid separation section and a settling section from top to bottom, a desulfurization section oil collecting tank is arranged below the desulfurization section in the tail gas treatment tower, a coke pool tail gas injection pipeline is arranged at the middle lower part of the tail gas treatment tower, a coke tower discharge steam injection pipeline, coke tower tail gas and tail gas injection pipelines generated by other equipment in the coking device are respectively and directly communicated with the gas-liquid separation section of the tail gas treatment tower, the coke tower discharge steam injection pipeline is communicated with the gas-liquid separation section of the tail gas treatment tower through the discharge steam quenching facility, a fresh washing water injection pipeline is arranged at the top of the discharge steam quenching facility, a spraying facility is arranged above the desulfurization section oil collecting tank in the tail gas treatment tower, a washing sewage extraction pipeline is arranged at the bottom of the tail gas treatment tower, a washing water extraction hopper is communicated with a washing water inlet through a washing water extraction pipeline, a washing water extraction pipeline is communicated with a tail gas treatment tank absorption pipeline, a tail gas absorption liquid extraction pipeline is arranged above the tail gas treatment tank absorption pipeline, a desulfurization waste liquid absorption pipeline is communicated with a coking liquid absorption tank inlet of the desulfurization section absorption tank, and a coking wastewater absorption oil collection tank, a desulfurization liquid absorption pipeline is arranged below the desulfurization liquid absorption tank, and a desulfurization liquid absorption tank absorption pipeline, and a coking wastewater absorption tank absorption pipeline are communicated with the tail gas absorption tank.
The second coking tail gas treatment device is further technically characterized in that: the middle lower part of the tail gas treatment tower is sequentially provided with a coke tower tail gas injection pipeline, a coke pool tail gas injection pipeline and a coke tower discharge steam injection pipeline from top to bottom, wherein the coke tower tail gas injection pipeline is generated by other equipment in the coking device.
The second coking tail gas treatment device is further technically characterized in that: the bleed steam quench facility is disposed on the vent gas treatment tower.
The second coking tail gas treatment device is further technically characterized in that: coking tail gas processing apparatus still includes the draught fan, takes off saturation back coking tail gas pipeline and draught fan entry intercommunication, and the draught fan export links to each other with VOC processing facility, and the preferred urgent blow-down pipeline that is equipped with on the pipeline between draught fan export and the VOC processing facility.
The second coking tail gas treatment device is further technically characterized in that: the bleed steam quench facility is tangentially disposed on the vent gas treatment column.
The second coking tail gas treatment device is further technically characterized in that: the bleed steam quench facility is a venturi injection condenser.
The Venturi scrubber is a common device in the field, generally comprises a Venturi tube (for short, a Venturi tube) and a dehydrator, wherein the dust removal of the Venturi scrubber comprises three processes of atomization, condensation and dehydration, the former two processes are carried out in the Venturi tube, and the latter process is carried out in the dehydrator. The venturi tube is composed of a contraction tube, a throat tube and a diffusion tube. The dust-containing gas enters the shrinkage pipe, and the gas speed is gradually increased. The pressure of the airflow gradually changes into kinetic energy, and when the airflow enters the throat, the flow velocity reaches the maximum value. Water enters through a plurality of small holes uniformly distributed on the periphery of the throat pipe and is highly atomized under the impact of high-speed airflow. The high velocity and low pressure at the throat saturate the gas flow. The air film attached to the surface of the same dust particle is broken, so that the dust particle is wetted by water. Therefore, intense collision and coagulation occur between the dust particles and water droplets or dust particles. After entering the diffusion tube, the air flow speed is reduced, the static pressure rises again, and the condensation effect taking dust particles as condensation nuclei is accelerated. The particles with condensed moisture are continuously condensed and collided, and the small particles are condensed into large particles which are easily trapped and separated by the dehydrator, so that the gas is purified.
The coke tower tail gas refers to tail gas discharged when a coke tower is opened from a top cover.
The induced draft fan provided by the invention has the function of generating suction to lead out coking tail gas.
The invention is mainly used in the coking field, and aims to solve the problems of water vapor and malodorous gas pollution, secondary pollution caused by tail gas VOC and coke powder discharged along with tail gas, and tail gas leakage of devices and other equipment in the existing delayed coking device coke pool and coke tower. Compared with the prior art, the invention has the following advantages:
1) The invention can solve the problems of water vapor and malodorous gas pollution, secondary pollution caused by tail gas VOC and coke powder discharged along with tail gas, and tail gas leakage of the device and other equipment in the coke tank and the coke tower of the existing delayed coking device.
2) The invention can fundamentally eliminate the four pollution problems in the 1) and improve the production working environment of the delayed coking device.
3) The invention can fundamentally solve the three types of pollution of water vapor, stink and dust and secondary coke powder pollution in the decoking process, and improve the production working environment of the delayed coking device.
4) The invention uses the Venturi scrubber and the Venturi injection condenser, when the Venturi injection condenser is installed along the tangential direction of the tower, the Venturi injection condenser has two functions of integrating tail gas washing and dust removal and tail gas quenching, coking tail gas enters the tail gas treatment tower at a high speed along the tangential direction of the tower, the space of the tail gas treatment tower is utilized for gas-liquid separation, and the tangential entering of the tail gas treatment tower can generate cyclone separation effect to strengthen the gas-liquid separation effect. The Venturi scrubber is adopted, so that the process and equipment are simple, reliable and efficient, the investment and the occupied area can be saved, and the Venturi scrubber is convenient for the implementation of the patent engineering.
5) The tail gas and the washing water enter the gas-liquid separation section at a high speed along the tangential direction of the tower, the washing water and the solid particles flow into the bottom of the tower in a rotating manner, the solid particles settle downwards, are discharged from the bottom periodically, return to the extraction hopper from the clarified washing water, and are extracted by the washing water circulating pump to be recycled as the washing water.
6) When the top of the tail gas treatment tower is desaturated and the coking tail gas is treated by the draught fan, the tail gas draught fan is adopted to suck the coke pool tail gas, the coke tower tail gas and other tail gases of the device, micro negative pressure is formed in the dehydration bin and the tail gas treatment tower, coke dust and harmful and combustible gases in the closed decoking system are guaranteed not to leak to the environment, and the coke dust and the harmful and combustible gases are completely collected and treated.
7) The tail gas treatment tower desaturation section comprises a desaturation gas-liquid separation section, a liquid trapping and gas distribution section and a heating desaturation section from bottom to top. The liquid trapping and gas distributor has the main functions of trapping liquid and uniformly distributing gas, and can also play a role of a heat insulation plate to ensure that gas phase rising to the heating desaturation section cannot be back-mixed to the gas-liquid separation section.
The invention is described in further detail below with reference to the figures and the detailed description, without limiting the scope of the invention.
Drawings
FIG. 1 is a simple schematic diagram of a coking tail gas treatment process of the present invention.
FIG. 2 is a simple schematic diagram of a second coking tail gas treatment process of the present invention.
FIG. 3 is a simplified schematic diagram of a third coking tail gas treatment process of the present invention.
The reference symbols shown in the figures are:
1. the system comprises a coke pool tail gas injection pipeline, 2 a tail gas washing facility, 3 a tail gas treatment tower, 4 a coke tower discharge steam injection pipeline, 5 a discharge steam quenching facility, 6 a coke tower tail gas and tail gas injection pipeline generated by other equipment in a coking device, 7 a washing water circulating pump, 8 an absorption liquid circulating pump, 9 an induced draft fan, 10 an emergency emptying pipeline, 11 a desaturation section, 12 VOC treatment facility, 13 a desulfurization section, 14 a settling section, 15 a gas-liquid separation section, 16 a desulfurization section oil collecting tank extraction opening, 17 a washing water extraction hopper, 18 a fresh washing water injection pipeline, 19 an absorption liquid injection pipeline, 20 a waste liquid extraction pipeline, 21 a desulfurization section oil collecting tank extraction pipeline, 22 a desulfurization section oil collecting tank, 23 a washing sewage extraction pipeline, 24 a washing water extraction pipeline, 25 a desaturation coking tail gas extraction pipeline, 26 a circulating water washing pipeline, 27 a washing line and 28 a spraying facility.
Detailed Description
As shown in fig. 1, a coking tail gas treatment process comprises the following steps:
1) Tail gas generated by a coke tower and tail gas generated by other equipment in the coking device directly enter a gas-liquid separation section 15 of a tail gas treatment tower 3 through a coke tower tail gas injection pipeline 6 and tail gas generated by other equipment in the coking device, the coke pool tail gas enters a tail gas washing facility 2 through a coke pool tail gas injection pipeline 1, is washed by circulating washing water, and enters the gas-liquid separation section 15 of the tail gas treatment tower 3 together with circulating washing water after being cooled, and the coke tower discharged steam enters a discharged steam quenching facility 5 through a coke tower discharged steam injection pipeline 4, is mixed with fresh washing water in the discharged steam quenching facility 5, and enters the gas-liquid separation section 15 of the tail gas treatment tower 3 after being cooled;
2) The material flow in the step 1) is subjected to gas-liquid separation in a gas-liquid separation section 15 of a tail gas treatment tower 3, gas-phase coking tail gas rises to a desulfurization section 13 and is in countercurrent contact with absorption liquid entering from the upper part of the desulfurization section 13 through an absorption liquid injection pipeline 19 for desulfurization, the desulfurized coking tail gas continuously rises to a desaturation section 11, the coking tail gas after desaturation comes out from the top of the tail gas treatment tower 3, enters an induced draft fan 9 through a desaturation coking tail gas pipeline 25, then enters a VOC treatment facility 12 for removing VOC (volatile organic compounds) and then is discharged, preferably, an emergency vent pipeline 10 (shown in figure 1) is arranged between the induced draft fan 9 and the VOC treatment facility 12, rich absorption liquid is pumped out from a desulfurization section oil collection tank suction port 16 below the desulfurization section 13, the rich absorption liquid is pumped out from a desulfurization section oil collection tank suction pipeline 21 and enters an absorption liquid circulating pump 8, the absorption liquid returns to the upper part of the desulfurization section 13 after pressurization and is pumped out through an absorption liquid injection pipeline 19, waste liquid is pumped out from a waste liquid pumping pipeline 20 after failure and is pumped out to a waste liquid washing unit for treatment, washing water washing and washing water in the tail gas treatment tower 3, the tail gas washing water washing pipeline 2, and washing water in a sewage washing circulating pump 26, wherein the waste water in the lower part of the tail gas washing facility 2 enters a sewage washing facility 2.
The coke drum bleed steam is mixed with fresh wash water in the bleed steam quench facility 5 and enters the gas-liquid separation section 15 of the tail gas treatment tower 3 tangentially after being cooled.
Said blowdown steam quench means 5 is preferably arranged on the off-gas treatment column 3, most preferably tangentially on the off-gas treatment column 3, preferably a venturi jet condenser.
The off-gas scrubbing means 2 is preferably arranged on the off-gas treatment column 3, most preferably tangentially on the off-gas treatment column 3, the off-gas scrubbing means 2 preferably being a venturi scrubber.
The lower middle part of the tail gas treatment tower 3 is sequentially provided with a coke tower tail gas injection pipeline 6, a coke pool tail gas injection pipeline 1 and a coke tower discharge steam injection pipeline 4 from top to bottom, wherein the 3 injection pipelines are respectively communicated with a gas-liquid separation section 15 of the tail gas treatment tower 3.
The coke tower tail gas refers to tail gas discharged when a coke tower is opened from a top cover.
As shown in fig. 2, it is different from fig. 1 in that a plurality of sets of spraying facilities 28 are provided in the gas-liquid separation section 15 of the tail gas treatment tower 3, the groups of spraying facilities 28 may be provided, preferably 1 to 5 sets, and the spraying facilities 28 are preferably provided between the coke drum tail gas and other equipment-generated tail gas injection line 6 in the coking plant and the coke drum tail gas injection line 1, that is, above the coke drum tail gas injection line 1, and below the coke drum tail gas and other equipment-generated tail gas injection line 6 in the coking plant, (2 sets are shown in fig. 2). The clear washing water is discharged from a washing water extraction hopper 17 at the lower part of the tail gas treatment tower 3, enters a washing water circulating pump 7 through a washing water extraction pipeline 24 for pressurization, and then is divided into two parts, one part enters the tail gas washing facility 2 through a circulating water washing pipeline 26 to be used as circulating washing water for circulation, and the other part enters a spraying facility 28 through a washing water pipeline 27 to further wash and cool the coking tail gas entering a gas-liquid separation section 15 of the tail gas treatment tower 3.
As shown in fig. 3, it is different from fig. 1 in that the coke pool tail gas directly enters the gas-liquid separation section 15 in the tail gas treatment tower 3 through the coke pool tail gas injection pipeline 1, a spraying facility 28 is arranged in the gas-liquid separation section 15 of the tail gas treatment tower 3, the spraying facility 28 is preferably arranged below the coke tower tail gas injection pipeline 6 and above the coke pool tail gas injection pipeline 1, and the spraying facility 28 can be arranged in multiple groups, preferably 1-5 groups, (2 groups are shown in fig. 3). The clear washing water is discharged from a washing water extraction hopper 17 at the lower part of the tail gas treatment tower 3, enters a washing water circulating pump 7 through a washing water extraction pipeline 24 for pressurization, and then enters a spraying facility 28 through a washing water pipeline 27 to wash and cool the coke oven tail gas entering the tail gas treatment tower 3.
Claims (23)
1. A coking tail gas treatment process is characterized by comprising the following steps:
1) The tail gas of the coke pool directly enters a gas-liquid separation section of a tail gas treatment tower for washing and cooling, or enters the gas-liquid separation section of the tail gas treatment tower after being washed and cooled, the steam discharged from the coke tower is cooled and then enters the gas-liquid separation section of the tail gas treatment tower, and the tail gas of the coke tower and tail gas generated by other equipment in the coking device directly enter the gas-liquid separation section of the tail gas treatment tower;
2) And (2) carrying out gas-liquid separation on the material flow in the step 1) in a gas-liquid separation section of a tail gas treatment tower, enabling gas-phase coking tail gas to rise to a desulfurization section to be in countercurrent contact with absorption liquid entering from the upper part of the desulfurization section for desulfurization, enabling the coking tail gas after desulfurization to continue to rise to a desaturation section, enabling the coking tail gas after desaturation to come out from the top of the tail gas treatment tower, entering an induced draft fan, removing VOC (volatile organic compounds) and emptying, pumping out rich absorption liquid from a desulfurization section oil collecting tank below the desulfurization section, pressurizing and returning to the upper part of the desulfurization section, conveying waste liquid after failure to a treatment unit for treatment, enabling washing water containing solid particles in the tail gas treatment tower to enter a settling section downwards, enabling washing sewage containing solid particles to come out from the bottom of the tail gas treatment tower after settling separation, enabling clear washing water to come out from a washing water pumping hopper at the lower part of the tail gas treatment tower, and enabling the clear washing water to be used as circulating washing water after pressurization.
2. The coking tail gas treatment process according to claim 1, characterized in that: the coke tower discharge steam and fresh washing water are mixed in a discharge steam quenching facility and enter a gas-liquid separation section of a tail gas treatment tower after being cooled.
3. The coking tail gas treatment process according to claim 1, characterized in that: the coke pool tail gas is washed by circulating washing water in a tail gas washing facility, and enters a gas-liquid separation section of a tail gas treatment tower together with circulating washing water after being cooled.
4. The coking tail gas treatment process according to claim 1, characterized in that: the coke pool tail gas is washed and cooled by a part of circulating washing water in a tail gas washing facility, then enters a gas-liquid separation section of a tail gas treatment tower together with the circulating washing water, and the other part of circulating washing water enters a gas-liquid separation section of the tail gas treatment tower to further wash and cool the coke pool tail gas.
5. The coking tail gas treatment process according to claim 1, characterized in that: and the coke pool tail gas directly enters a gas-liquid separation section of a tail gas treatment tower, and is washed and cooled by circulating washing water.
6. The coking tail gas treatment process according to claim 3, characterized in that: the coke pool tail gas is washed by circulating washing water in a Venturi scrubber, and enters a gas-liquid separation section of a tail gas treatment tower together with the circulating washing water after being cooled.
7. The coking tail gas treatment process according to claim 1, characterized in that: the coke tower discharge steam and fresh washing water are mixed in a discharge steam quenching facility, and the cooled mixture enters a gas-liquid separation section of the tail gas treatment tower along the tangential direction.
8. A coking tail gas treatment process according to claim 1, 2 or 7, characterized in that: the discharged steam of the coke tower is mixed with fresh washing water in the Venturi injection condenser, and the mixture enters a gas-liquid separation section of the tail gas treatment tower after being cooled.
9. A coking tail gas treatment plant for use in the process of claim 1, characterized by: the coking tail gas treatment device comprises a tail gas treatment tower, a discharged steam quenching facility and a tail gas washing facility, wherein the tail gas treatment tower sequentially comprises a desaturation section, a desulfurization section, a gas-liquid separation section and a settling section from top to bottom, a desulfurization section oil collecting tank is arranged below the desulfurization section in the tail gas treatment tower, a coke pool tail gas injection pipeline, a coke tower discharged steam injection pipeline, coke tower tail gas and a tail gas injection pipeline generated by other equipment in a coking device are arranged at the middle lower part of the tail gas treatment tower, the coke pool tail gas injection pipeline is communicated with the gas-liquid separation section of the tail gas treatment tower through the tail gas washing facility, the coke tower discharged steam injection pipeline is communicated with the gas-liquid separation section of the tail gas treatment tower through the discharged steam quenching facility, and the top of the discharged steam quenching facility is provided with a fresh washing water injection pipeline, the tail gas of the coke tower and the tail gas injection pipeline generated by other equipment in the coking device are directly communicated with a gas-liquid separation section of a tail gas treatment tower, a washing sewage extraction pipeline is arranged at the bottom of the tail gas treatment tower, a washing water extraction hopper is arranged at the lower part of the settling section and is communicated with an inlet of a washing water circulating pump through the washing water extraction pipeline, an outlet of the washing water circulating pump is communicated with a tail gas washing facility, an absorption liquid injection pipeline is arranged above a desulfurization section of the tail gas treatment tower, a desulfurization section oil collection tank extraction port is arranged below the desulfurization section oil collection tank, the desulfurization section oil collection tank extraction port is communicated with an inlet of the absorption liquid circulating pump through a desulfurization section oil collection tank extraction pipeline, an outlet of the absorption liquid circulating pump is communicated with the absorption liquid injection pipeline and a waste liquid extraction pipeline, a desaturated coking tail gas pipeline is arranged at the top of the tail gas treatment tower, and the desaturated coking tail gas pipeline is connected with the VOC treatment facility.
10. The coking tail gas treatment plant of claim 9, characterized in that: the bleed steam quench facility is disposed on the vent gas treatment tower.
11. The coking tail gas treatment plant of claim 9, characterized in that: the middle lower part of the tail gas treatment tower is sequentially provided with a coke tower tail gas injection pipeline, a coke pool tail gas injection pipeline and a coke tower discharge steam injection pipeline from top to bottom, wherein the coke tower tail gas injection pipeline is generated by other equipment in the coking device.
12. The coking tail gas treatment plant of claim 9, characterized in that: the tail gas washing facility is arranged on the tail gas treatment tower.
13. The coking tail gas treatment plant of claim 9, characterized in that: the coking tail gas treatment device also comprises a spraying facility which is arranged below the oil collecting tank of the desulfurization section in the tail gas treatment tower and above the coke pool tail gas injection pipeline, and the spraying facility is communicated with the outlet of the washing water circulating pump through a washing water pipeline.
14. The coking tail gas treatment plant of claim 9, characterized in that: coking tail gas processing apparatus still includes the draught fan, desaturates back coking tail gas pipeline and draught fan entry intercommunication, and the draught fan export links to each other with VOC processing facility, is equipped with urgent unloading pipeline on the pipeline between draught fan export and the VOC processing facility.
15. The coking tail gas treatment plant of claim 9 or 12, characterized in that: the tail gas washing facility is a Venturi scrubber.
16. The coking tail gas treatment plant of claim 9 or 10, characterized in that: the blowdown steam quench facility is a venturi spray condenser.
17. The coking tail gas treatment plant of claim 9 or 10, characterized in that: the tail gas washing facility and/or the discharge steam quenching facility are arranged on the tail gas treatment tower tangentially.
18. A coking tail gas treatment plant for use in the process of claim 1, characterized by: the coking tail gas treatment device comprises a tail gas treatment tower, a discharged steam quenching facility and a spraying facility, wherein the tail gas treatment tower sequentially comprises a desaturation section, a desulfurization section, a gas-liquid separation section and a settling section from top to bottom, a desulfurization section oil collecting tank is arranged below the desulfurization section in the tail gas treatment tower, a coke pool tail gas injection pipeline, a coke tower discharged steam injection pipeline, a coke tower tail gas and a tail gas injection pipeline generated by other equipment in a coking device are arranged at the middle lower part of the tail gas treatment tower, the coke pool tail gas injection pipeline, the coke tower tail gas and the tail gas injection pipeline generated by other equipment in the coking device are respectively and directly communicated with the gas-liquid separation section of the tail gas treatment tower, the coke tower discharged steam injection pipeline is communicated with the gas-liquid separation section of the tail gas treatment tower through the discharged steam quenching facility, and a fresh washing water injection pipeline is arranged at the top of the discharged steam quenching facility, the desulfurization section oil collecting tank below in the tail gas treatment tower, and be provided with the facility that sprays above the burnt pond tail gas injection pipeline, the tail gas treatment tower bottom is equipped with washing sewage extraction pipeline, the lower part is equipped with washing water extraction bucket, washing water extraction bucket passes through washing water extraction pipeline and washing water circulating pump entry intercommunication, washing water circulating pump export passes through washing water pipeline and sprays the facility intercommunication, tail gas treatment tower desulfurization section top is equipped with absorption liquid injection pipeline, desulfurization section oil collecting tank below is equipped with desulfurization section oil collecting tank extraction mouth, desulfurization section oil collecting tank extraction mouth passes through desulfurization section oil collecting tank extraction pipeline and absorption liquid circulating pump entry intercommunication, absorption liquid circulating pump export and absorption liquid injection pipeline and waste liquid extraction pipeline intercommunication, tail gas treatment tower top is provided with the coking tail gas pipeline after the desaturation, the coking tail gas pipeline after the desaturation links to each other with VOC processing facility.
19. The coking tail gas treatment plant of claim 18, characterized in that: the middle lower part of the tail gas treatment tower is sequentially provided with a coke tower tail gas injection pipeline, a coke pool tail gas injection pipeline and a coke tower discharge steam injection pipeline from top to bottom, wherein the coke tower tail gas injection pipeline is generated by other equipment in the coking device.
20. The coking tail gas treatment plant of claim 18, characterized in that: the bleed steam quench facility is disposed on the vent gas treatment tower.
21. The coking tail gas treatment plant of claim 18, characterized in that: coking tail gas processing apparatus still includes the draught fan, desaturates back coking tail gas pipeline and draught fan entry intercommunication, and the draught fan export links to each other with VOC processing facility, is equipped with urgent unloading pipeline on the pipeline between draught fan export and the VOC processing facility.
22. The coking tail gas treatment plant of claim 20, characterized in that: the bleed steam quench facility is tangentially disposed on the tail gas treatment column.
23. The coking tail gas treatment plant of claim 20 or 22, characterized in that: the blowdown steam quench facility is a venturi spray condenser.
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| CN201811215023.9A CN111068492B (en) | 2018-10-18 | 2018-10-18 | Coking tail gas treatment process and device |
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| CN201811215023.9A CN111068492B (en) | 2018-10-18 | 2018-10-18 | Coking tail gas treatment process and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105797562A (en) * | 2016-05-05 | 2016-07-27 | 济南冶金化工设备有限公司 | Two-section type double-ammonia-process integrated desulfurization and denitration system for coking flue gas |
| CN107198923A (en) * | 2017-06-20 | 2017-09-26 | 中冶焦耐(大连)工程技术有限公司 | A kind of purification process technique of coke wet quenching steam |
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| JP5175429B2 (en) * | 2005-06-28 | 2013-04-03 | 新日鉄住金エンジニアリング株式会社 | Coke oven gas cooling apparatus and method |
| CN201079725Y (en) * | 2007-08-10 | 2008-07-02 | *** | Exhaust gas washing absorbing tower |
| CN201832555U (en) * | 2010-11-05 | 2011-05-18 | 中国石油化工股份有限公司 | Optimized two-circulating flue gas dust removal and desulfurization device |
| CN203525537U (en) * | 2013-09-02 | 2014-04-09 | 中石化广州工程有限公司 | Delayed coking tail gas treatment device |
| CN104762110A (en) * | 2015-03-15 | 2015-07-08 | 辽宁圣赫机械制造成套设备有限公司 | Coking gas desulfuration-regeneration integrated column having multilayer spray structure |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105797562A (en) * | 2016-05-05 | 2016-07-27 | 济南冶金化工设备有限公司 | Two-section type double-ammonia-process integrated desulfurization and denitration system for coking flue gas |
| CN107198923A (en) * | 2017-06-20 | 2017-09-26 | 中冶焦耐(大连)工程技术有限公司 | A kind of purification process technique of coke wet quenching steam |
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