CN111068491A - Coking tail gas treatment method and device - Google Patents
Coking tail gas treatment method and device Download PDFInfo
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- CN111068491A CN111068491A CN201811214980.XA CN201811214980A CN111068491A CN 111068491 A CN111068491 A CN 111068491A CN 201811214980 A CN201811214980 A CN 201811214980A CN 111068491 A CN111068491 A CN 111068491A
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Abstract
The invention discloses a coking tail gas treatment method 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 tail gas generated by coke pool, the steam discharged by coke tower, the tail gas generated by coke tower and other equipment in the coking device enters the gas-liquid separation section of the tail gas treatment tower for gas-liquid separation, the gas-phase coking tail gas rises to the desulfurization section and is in countercurrent contact with the absorption liquid for desulfurization, the desulfurized coking tail gas comes out from the top of the tail gas treatment tower and is evacuated after VOC is removed, 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 the treatment unit, the tail gas treatment tower contains solid particle washing water and enters the settling section downwards, the washing sewage containing solid particles comes out from the bottom of the tail gas treatment tower, clarified washing water is pumped out by the washing water at the lower part of the tail gas.
Description
Technical Field
The invention belongs to the field of coking tail gas treatment in a petroleum processing process, and relates to a coking tail gas treatment method 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 dehydrating 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, so that malodorous gas around the coke pool, mainly diffused by hydrogen sulfide, is generated; petroleum coke contains volatile components, so that the problem of VOC pollution around the petroleum coke is caused; during the standing dehydration process of the coke, the moisture of the coke on the upper layer is lost, and the coke powder flies with the wind and is spread around the coke pool to form dust pollution. After the coke-removing operation opens the top cover of the coke tower, water vapor and foul gas also escape from the top of the coke tower. 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 needed to treat the pollution and improve the working environment.
CN2808275Y discloses a foul smell treatment device, its technical scheme 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 201320555900.3 discloses a coking tail gas treatment device, which is characterized in that an induced draft fan generates suction force to draw out coke pool tail gas and coke tower top tail gas, the coke pool tail gas is firstly sprayed to remove coke powder, is further cooled by a quenching facility to eliminate water vapor, then is mixed with the coke tower top tail gas to enter the bottom of a tail gas deodorization tower, is in reverse contact with an absorbent entering the top of the tower to absorb malodorous gases such as hydrogen sulfide and the like, and the purified tail gas is exhausted by the induced draft fan.
Disclosure of Invention
The invention aims to provide a coking tail gas treatment method and a coking tail gas treatment device, which are used for solving the problems of water vapor and malodorous gas pollution, tail gas VOC and coke powder which are caused by tail gas emission and secondary pollution in a coke pool and a coke tower of the existing delayed coking device, and the problem of tail gas leakage in the device and other equipment. The coking tail gas in the invention refers to coke tower tail gas, coke pool tail gas, coke tower discharged steam, 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 method, which is characterized by comprising the following steps:
1) the steam discharged from the coke tower is cooled and then enters a gas-liquid separation section of the tail gas treatment tower, 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, and the tail gas of the coke pool directly enters the gas-liquid separation section of the tail gas treatment tower to be washed and cooled or enters the gas-liquid separation section of the tail gas treatment tower after being washed and cooled.
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 for desulfurization, the desulfurized coking tail gas comes out from the top of the tail gas treatment tower and is emptied after VOC (volatile organic compounds) removal, rich absorption liquid is pumped out from a desulfurization section oil collecting tank below the desulfurization section and returns to the upper part of the desulfurization section after pressurization, waste liquid after failure is sent out 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 comes out from a washing water pumping hopper at the lower part of the tail gas treatment tower and is recycled as circulating washing water after pressurization.
The invention is further technically characterized in that: and the desulfurized coking tail gas comes out from the top of the tail gas treatment tower, enters a desaturator to be desaturated, and is discharged after VOC is removed.
The invention is further technically characterized in that: and the desulfurized coking tail gas is discharged from the top of the tail gas treatment tower and is conveyed to a desaturator through a draught fan to be desaturated, and the desaturated coking tail gas is emptied after VOC is removed.
The invention 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 is cooled and then enters a gas-liquid separation section of the tail gas treatment tower, 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 invention 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 the 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 invention 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 invention 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 invention is further technically characterized in that: the off-gas scrubbing means is preferably a venturi scrubber.
The invention also provides a coking tail gas treatment device, which is used for the coking tail gas treatment method. 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 tail gas washing facility and a discharged steam quenching facility, wherein the tail gas treatment tower sequentially comprises 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 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, a fresh washing water injection pipeline is arranged at the top of the discharged steam quenching facility, the coke tower tail gas and the tail gas injection pipeline generated by other, the bottom of the tail gas treatment tower is provided with a washing sewage pumping pipeline, the lower part of the tail gas treatment tower is provided with a washing water pumping hopper, the washing water pumping hopper is communicated with a washing water circulating pump inlet through the washing water pumping pipeline, the washing water circulating pump outlet is communicated with a tail gas washing facility, the upper part of the desulfurization section of the tail gas treatment tower is provided with an absorption liquid injection pipeline, the lower part of the desulfurization section oil collecting tank is provided with a desulfurization section oil collecting tank pumping outlet, the desulfurization section oil collecting tank pumping outlet is communicated with the absorption liquid circulating pump inlet through the desulfurization section oil collecting tank pumping pipeline, the outlet of the absorption liquid circulating pump is communicated with the absorption liquid injection pipeline and a waste liquid pumping pipeline, the top of the tail gas treatment tower is provided with.
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 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 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, and desulfurization back coking tail gas pipeline communicates with the draught fan entry, and the draught fan export links to each other with 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, which is tangentially disposed on the tail gas treating tower.
The coking tail gas treatment device is further technically characterized in that: coking tail gas processing apparatus still includes the desaturator, and desulfurization back coking tail gas pipeline and draught fan entry intercommunication, the draught fan export links to each other with desaturator and VOC processing facility in proper order.
The invention also provides a second coking tail gas treatment device, which is used for the coking tail gas treatment method. 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 discharged steam quenching facility and a spraying facility, wherein the tail gas treatment tower sequentially comprises 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 the 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, a fresh washing water injection pipeline is arranged at the top of the discharged steam quenching facility, the lower part of the desulfurization section oil collecting tank, the bottom of the tail gas treatment tower is provided with a washing sewage pumping pipeline, the lower part of the tail gas treatment tower is provided with a washing water pumping hopper, the washing water pumping hopper is communicated with a washing water circulating pump inlet through the washing water pumping pipeline, the washing water circulating pump outlet is communicated with a spraying facility through a washing water pipeline, the upper part of the desulfurization section of the tail gas treatment tower is provided with an absorption liquid injection pipeline, the lower part of the desulfurization section oil collecting tank is provided with a desulfurization section oil collecting tank pumping outlet, the desulfurization section oil collecting tank pumping outlet is communicated with an absorption liquid circulating pump inlet through a desulfurization section oil collecting tank pumping pipeline, the outlet of the absorption liquid circulating pump is communicated with an absorption liquid injection pipeline and a waste liquid pumping pipeline, the top of the tail gas treatment tower is provided with.
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: 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: coking tail gas processing apparatus still includes the draught fan, and coking tail gas pipeline communicates with the draught fan entry after the desulfurization, and the draught fan export links to each other with VOC processing facility, and the preferred urgent pipeline of unloading 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 tangent line of the bleed steam quenching facility is arranged on the tail gas treatment tower, and the bleed steam quenching facility is a Venturi jet condenser.
The second coking tail gas treatment device is further technically characterized in that: coking tail gas processing apparatus still includes the desaturator, and desulfurization back coking tail gas pipeline and draught fan entry intercommunication, the draught fan export links to each other with desaturator and VOC processing facility in proper order.
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 contraction 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 cause the gas stream to reach saturation. 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 is increased again, and the condensation effect taking dust particles as condensation nuclei is accelerated. The particles with condensed moisture continue to be 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 arranged along the tangential direction of the tower, the Venturi injection condenser has two functions of tail gas washing and dust removal and tail gas quenching, coking tail gas enters the tail gas treatment tower at high speed along the tangential direction of the tower, gas-liquid separation is carried out by utilizing the space of the tail gas treatment tower, and the tangential entering of the coking tail gas into 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 implementation of the patent engineering is facilitated.
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 mode, the solid particles settle downwards and are discharged from the bottom periodically, the clarified washing water returns upwards to the extraction hopper and is extracted by the washing water circulating pump to be used as the washing water for recycling.
6) During the coking tail gas draught fan scheme behind the tail gas treatment tower top desulfurization, adopt the tail gas draught fan to suction coke drum tail gas, coke tower tail gas and other tail gases of device, form the little negative pressure at dehydration bin, tail gas treatment tower, guarantee that coke dust and harmful, combustible gas do not leak the environment in the airtight decoking system, do coke dust and harmful, combustible gas and collect the improvement completely.
7) When the scheme of the desaturator is adopted, the desaturator of the tail gas treatment tower comprises a desaturation gas-liquid separation section, a liquid trapping and gas distributing 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 method of the present invention.
FIG. 2 is a simplified schematic diagram of a second coking tail gas treatment method of the present invention.
FIG. 3 is a simplified schematic diagram of a third coking tail gas treatment process of the present invention.
FIG. 4 is a simplified schematic diagram of a fourth coking tail gas treatment method of the present invention.
FIG. 5 is a simplified schematic diagram of a fifth coking tail gas treatment method according to the present invention.
FIG. 6 is a simplified schematic diagram of a sixth coking tail gas treatment method according to the present invention.
The reference symbols shown in the figures are:
1. 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 vent pipeline, 11 a desaturation section, 12 a 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 port, 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 desaturated coking tail gas pipeline, 26. a circulating water washing pipeline, 27 washing water pipelines, 28 spraying facilities, 29 a desulfurization coking tail gas pipeline.
Detailed Description
As shown in fig. 1, a coking tail gas treatment method 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 for desulfurization, the desulfurized coking tail gas passes through a desulfurized coking tail gas pipeline 29 and then comes out of the top of the tail gas treatment tower 3, enters an induced draft fan 9, then enters a VOC treatment facility 12 to remove VOCs (volatile organic compounds) and then is discharged, an emergency vent pipeline 10 (shown in figure 1) is preferably arranged between the induced draft fan 9 and the VOC treatment facility 12, rich absorption liquid is pumped out from a desulfurization section oil tank pumping outlet 16 below the desulfurization section 13, enters an absorption liquid circulating pump 8 through a desulfurization section oil tank pumping pipeline 21, is pressurized and then returns to an absorption liquid injection pipeline 19 to the upper part of the desulfurization section 13, and waste liquid after failure is sent out to a, the washing water containing solid particles in the tail gas treatment tower 3 enters the settling section 14 downwards, after settling separation, the washing sewage containing solid particles comes out from a washing sewage extraction pipeline 23 at the bottom of the tail gas treatment tower 3, the clarified washing water comes out 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 the tail gas washing facility 2 through a circulating water washing pipeline 26 to be recycled as circulating washing water.
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.
The bleed 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.
As shown in fig. 2, the difference from fig. 1 is that a plurality of groups, preferably 1 to 5 groups, of spraying facilities 28 are provided in the gas-liquid separation section 15 of the tail gas treatment tower 3, the spraying facilities 28 are preferably provided between the coke drum tail gas injection pipeline 6 and the coke drum tail gas injection pipeline 1 of the coke drum tail gas and other equipment generating tail gas in the coking plant, that is, above the coke drum tail gas injection pipeline 1, and below the coke drum tail gas injection pipeline 6 and other equipment generating tail gas in the coking plant, (2 groups are shown in fig. 2). The clarified 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, wherein one part enters the tail gas washing facility 2 through a circulating water washing pipeline 26 to be recycled as circulating washing water, 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, the difference from fig. 1 is that the coke drum tail gas directly enters a gas-liquid separation section 15 in a tail gas treatment tower 3 through a coke drum 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 can be arranged in multiple groups, preferably 1-5 groups, the spraying facility 28 is preferably arranged between a coke drum tail gas and tail gas injection pipeline 6 generated by other equipment in the coking device and the coke drum tail gas injection pipeline 1, namely above the coke drum tail gas injection pipeline 1, and below the coke drum tail gas and tail gas generated by other equipment in the coking device and the tail gas injection pipeline 6 (2 groups are shown in fig. 3). The clarified washing water is discharged from a washing water pumping hopper 17 at the lower part of the tail gas treatment tower 3, enters a washing water circulating pump 7 through a washing water pumping pipeline 24 for pressurization, enters a spraying facility 28 through a washing water pipeline 27, and washes and cools the coke oven tail gas entering the tail gas treatment tower 3.
As shown in fig. 4, the difference from fig. 1 is that the desulfurized coking tail gas passes through a desulfurized coking tail gas pipeline 29 and comes out of the top of the tail gas treatment tower 3, enters the induced draft fan 9, then enters the desaturator 11 to perform the desaturation process, the desaturated coking tail gas passes through a desaturated coking tail gas pipeline 25 and enters the VOC treatment facility 12 to remove VOCs (volatile organic compounds) and then is discharged, an emergency vent pipeline 10 (shown in fig. 4) is preferably arranged between the induced draft fan 9 and the desaturator 11, the coking tail gas entering the desaturator 11 performs the desaturation process, the desaturated coking tail gas comes out of the top of the desaturator 11, and the liquid in the desaturator 11 comes out of the bottom of the desaturator 11 and can be returned to the.
As shown in fig. 5, the difference from fig. 2 is that the desulfurized coking tail gas passes through a desulfurized coking tail gas pipeline 29 and comes out of the top of the tail gas treatment tower 3, enters the induced draft fan 9, then enters the desaturator 11 to perform the desaturation process, the desaturated coking tail gas passes through a desaturated coking tail gas pipeline 25 and enters the VOC treatment facility 12 to remove VOCs (volatile organic compounds) and then is discharged, an emergency vent pipeline 10 (shown in fig. 5) is preferably arranged between the induced draft fan 9 and the desaturator 11, the coking tail gas entering the desaturator 11 performs the desaturation process, the desaturated coking tail gas comes out of the top of the desaturator 11, and the liquid in the desaturator 11 comes out of the bottom of the desaturator 11 and can be returned to the.
As shown in fig. 6, it is different from fig. 3 in that desulfurized coking tail gas passes through a desulfurized coking tail gas line 29 to come out from the top of the tail gas treatment tower 3, enters the induced draft fan 9, and then enters the desaturator 11 to perform a desaturation process, the desaturated coking tail gas passes through a desaturated coking tail gas line 25, enters the VOC treatment facility 12 to remove VOCs (volatile organic compounds), and is then discharged, an emergency vent line 10 (as shown in fig. 6) is preferably arranged between the induced draft fan 9 and the desaturator 11, the coking tail gas entering the desaturator 11 performs a desaturation process, the desaturation is then come out from the top of the desaturator 11, and liquid in the desaturator 11 comes out from the bottom of the desaturator 11 and can be returned to the.
Claims (24)
1. A coking tail gas treatment method is characterized by comprising the following steps:
1) cooling the steam discharged from the coke tower, and then entering a gas-liquid separation section of a tail gas treatment tower, directly entering tail gas of the coke tower and tail gas generated by other equipment in a coking device into the gas-liquid separation section of the tail gas treatment tower, washing and cooling the tail gas of a coke pool in the gas-liquid separation section of the tail gas treatment tower, or washing and cooling the tail gas and then entering 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 desulfurized coking tail gas comes out from the top of the tail gas treatment tower, the coking tail gas is emptied after VOC removal, rich absorption liquid is pumped out from a pumping outlet of a desulfurization section oil collecting tank below the desulfurization section, the rich absorption liquid is returned to the upper part of the desulfurization section after pressurization, waste liquid after failure is sent out 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 the solid particles comes out from the bottom of the tail gas treatment tower after settling separation, clarified washing water is pumped out from a washing water pumping hopper at the lower part of.
2. The coking tail gas treatment method 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 method according to claim 1, characterized in that: and the desulfurized coking tail gas comes out from the top of the tail gas treatment tower, enters a desaturator to be desaturated, and is discharged after VOC is removed.
4. The coking tail gas treatment method 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 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.
5. The coking tail gas treatment method according to claim 1, characterized in that: and the desulfurized coking tail gas is discharged from the top of the tail gas treatment tower and is conveyed to a desaturator through a draught fan to be desaturated, and the desaturated coking tail gas is emptied after VOC is removed.
6. The coking tail gas treatment method according to claim 3, characterized in that: the tail gas of the coke pool is washed by circulating washing water in a Venturi scrubber, and enters a gas-liquid separation section of the tail gas treatment tower together with the circulating washing water after being cooled, and preferably enters the gas-liquid separation section of the tail gas treatment tower together with the circulating washing water along the tangential direction after being cooled.
7. The coking tail gas treatment method 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.
8. The coking tail gas treatment method 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.
9. The coking tail gas treatment method according to claim 1, 2 or 8, characterized in that: the steam discharged from 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.
10. 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 tail gas washing facility and a discharged steam quenching facility, wherein the tail gas treatment tower sequentially comprises 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 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, a fresh washing water injection pipeline is arranged at the top of the discharged steam quenching facility, the coke tower tail gas and the tail gas injection pipeline generated by other, the bottom of the tail gas treatment tower is provided with a washing sewage pumping pipeline, the lower part of the tail gas treatment tower is provided with a washing water pumping hopper, the washing water pumping hopper is communicated with a washing water circulating pump inlet through the washing water pumping pipeline, the washing water circulating pump outlet is communicated with a tail gas washing facility, the upper part of the desulfurization section of the tail gas treatment tower is provided with an absorption liquid injection pipeline, the lower part of the desulfurization section oil collecting tank is provided with a desulfurization section oil collecting tank pumping outlet, the desulfurization section oil collecting tank pumping outlet is communicated with the absorption liquid circulating pump inlet through the desulfurization section oil collecting tank pumping pipeline, the outlet of the absorption liquid circulating pump is communicated with the absorption liquid injection pipeline and a waste liquid pumping pipeline, the top of the tail gas treatment tower is provided with.
11. The coking tail gas treatment plant of claim 10, characterized in that: the tail gas washing facility is arranged on the tail gas treatment tower.
12. The coking tail gas treatment plant of claim 10, characterized in that: the bleed steam quench facility is disposed on the vent gas treatment tower.
13. The coking tail gas treatment plant of claim 10, 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.
14. The coking tail gas treatment plant of claim 10, 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.
15. The coking tail gas treatment plant of claim 10, characterized in that: coking tail gas processing apparatus still includes the draught fan, and desulfurization back coking tail gas pipeline communicates with the draught fan entry, and the draught fan export links to each other with VOC processing facility.
16. The coking tail gas treatment plant of claim 11, characterized in that: the tail gas washing facility is a Venturi scrubber, and the tail gas washing facility is arranged on the tail gas treatment tower in a tangent mode.
17. The coking tail gas treatment plant of claim 12, characterized in that: the bleed steam quench facility is a venturi injection condenser, which is tangentially disposed on the tail gas treating tower.
18. The coking tail gas treatment plant of claim 15, characterized in that: coking tail gas processing apparatus still includes the desaturator, and desulfurization back coking tail gas pipeline and draught fan entry intercommunication, the draught fan export links to each other with desaturator and VOC processing facility in proper order.
19. 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 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 the 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, a fresh washing water injection pipeline is arranged at the top of the discharged steam quenching facility, the lower part of the desulfurization section oil collecting tank, the bottom of the tail gas treatment tower is provided with a washing sewage pumping pipeline, the lower part of the tail gas treatment tower is provided with a washing water pumping hopper, the washing water pumping hopper is communicated with a washing water circulating pump inlet through the washing water pumping pipeline, the washing water circulating pump outlet is communicated with a spraying facility through a washing water pipeline, the upper part of the desulfurization section of the tail gas treatment tower is provided with an absorption liquid injection pipeline, the lower part of the desulfurization section oil collecting tank is provided with a desulfurization section oil collecting tank pumping outlet, the desulfurization section oil collecting tank pumping outlet is communicated with an absorption liquid circulating pump inlet through a desulfurization section oil collecting tank pumping pipeline, the outlet of the absorption liquid circulating pump is communicated with an absorption liquid injection pipeline and a waste liquid pumping pipeline, the top of the tail gas treatment tower is provided with.
20. The coking tail gas treatment plant of claim 19, 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 19, 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.
22. The coking tail gas treatment plant of claim 19, characterized in that: coking tail gas processing apparatus still includes the draught fan, and coking tail gas pipeline communicates with the draught fan entry after the desulfurization, and the draught fan export links to each other with VOC processing facility, and the preferred urgent pipeline of unloading that is equipped with on the pipeline between draught fan export and the VOC processing facility.
23. The coking tail gas treatment plant of claim 21, characterized in that: the tangent line of the bleed steam quenching facility is arranged on the tail gas treatment tower, and the bleed steam quenching facility is a Venturi jet condenser.
24. The coking tail gas treatment plant of claim 22, characterized in that: coking tail gas processing apparatus still includes the desaturator, and desulfurization back coking tail gas pipeline and draught fan entry intercommunication, the draught fan export links to each other with desaturator and VOC processing facility in proper order.
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| CN201811214980.XA CN111068491B (en) | 2018-10-18 | 2018-10-18 | Coking tail gas treatment method and device |
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