CN111068493A - Coking tail gas treatment process and device - Google Patents
Coking tail gas treatment process and device Download PDFInfo
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- CN111068493A CN111068493A CN201811215032.8A CN201811215032A CN111068493A CN 111068493 A CN111068493 A CN 111068493A CN 201811215032 A CN201811215032 A CN 201811215032A CN 111068493 A CN111068493 A CN 111068493A
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- B01D53/34—Chemical or biological purification of waste gases
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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 discharge 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 portion of the desulfurization section for desulfurization, the desulfurized coking tail gas comes out of the top of the tail gas treatment tower and enters a desaturator for desaturation, the desaturated coking tail gas comes out of the desaturator, VOC is removed and then is emptied, rich absorption liquid is pumped out and pressurized and then returns to the upper portion of the desulfurization section, waste liquid after failure is sent out to a treatment unit for treatment, washing water in the tail gas treatment tower comes out of the bottom of the tail gas treatment tower downwards, one part of the washing water comes.
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 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 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 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 process, 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 the 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 4, the tail gas is washed and cooled and then enters 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 of the top of the tail gas treatment tower and enters a desaturator to be desaturated, the desaturated coking tail gas comes out of the desaturator, VOC (volatile organic compounds) is removed and then is discharged, 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 in the tail gas treatment tower flows downwards out of the bottom of the tail gas treatment tower, one part of the washing water is discharged from a device, and the other.
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 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 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 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.
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 washing water in the tail gas treatment tower downwards flows out from the bottom of the tail gas treatment tower, after sedimentation or filtration, washing sewage containing solid particles flows out of the device, and the clarified washing water is pressurized and then is recycled as circulating washing water.
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 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 carry out a desaturation process, and the desaturated coking tail gas is discharged from the desaturator and is emptied after VOC is removed. An emergency air defense pipeline is preferably arranged between the induced draft fan and the desaturator.
The invention also 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 tail gas washing facility, a discharged steam quenching facility and a desaturator, wherein the tail gas treatment tower sequentially comprises a desulfurization section and a gas-liquid separation 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 tail gas treatment tower bottom is equipped with the washing water extraction pipeline, the washing water extraction pipeline communicates with washing sewage extraction pipeline and circulation washing water extraction pipeline respectively, circulation washing water extraction pipeline and washing water circulating pump entry intercommunication, washing water circulating pump export and tail gas washing facility intercommunication, tail gas treatment tower desulfurization section top is equipped with the 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 communicates with absorption liquid injection pipeline and waste liquid extraction pipeline respectively, tail gas treatment tower top is provided with the coking tail gas pipeline after the desulfurization, the coking tail gas pipeline after the desulfurization is linked together with desaturator and VOC processing facility in proper order.
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.
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 coking tail gas treatment device also comprises a sedimentation device or a filtering device, and the washing water extraction pipeline is respectively communicated with the washing sewage extraction pipeline and the circulating washing water extraction pipeline through the sedimentation device or the filtering device.
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 draught fan entry, draught fan export in proper order with the draught fan entryDesaturatorAnd the pipeline between the outlet of the induced draft fan and the desaturator is preferably provided with an emergency emptying pipeline.
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 tail gas washing facility and/or the bleed steam quenching facility are arranged on the tail gas treatment tower tangentially.
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 discharged steam quenching facility, a desaturator and a spraying facility, wherein the tail gas treatment tower sequentially comprises a desulfurization section and a gas-liquid separation 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 tail gas injection pipelines 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 pipelines generated by other equipment in the coking device are respectively 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, a spraying facility is arranged below the desulfurization section oil collecting tank, the tail gas treatment tower bottom is equipped with the washing water and takes out the pipeline, the washing water takes out the pipeline and communicates with washing sewage pump line and circulation washing water pump line respectively, circulation washing water takes out the pipeline and communicates with washing water circulating pump entry, washing water circulating pump export is through washing water pipeline and spray facility intercommunication, tail gas treatment tower desulfurization section top is equipped with the absorption liquid injection line, desulfurization section sump oil case below is equipped with desulfurization section sump oil case pump outlet, desulfurization section sump oil case pump outlet passes through desulfurization section sump oil case pump line and absorption liquid circulating pump entry intercommunication, absorption liquid circulating pump export communicates with absorption liquid injection line and waste liquid pump line respectively, tail gas treatment tower top is provided with the coking tail gas pipeline after the desulfurization, the coking tail gas pipeline after the desulfurization links to each other with desaturator and VOC processing facility in proper order.
The second coking tail gas treatment device is further technically characterized in that: the coking tail gas treatment device also comprises a sedimentation device or a filtering device, and the washing water extraction pipeline is respectively communicated with the washing sewage extraction pipeline and the circulating washing water extraction pipeline through the sedimentation device or the filtering device.
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, and desulfurization back coking tail gas pipeline draught fan entry intercommunication, the draught fan export links to each other with desaturator and VOC processing facility in proper order, and the draught fan export is with take off the pipeline between the saturator and preferably be equipped with urgent blow-down pipeline.
The second 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 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 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) 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.
6) The desaturator of the invention comprises a desaturation gas-liquid separation section, a liquid capture and gas distribution section and a heating desaturation section from bottom to top. The liquid trapping and gas distributing section has the main functions of trapping liquid and uniformly distributing gas, and can also play a role of a heat insulating 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 simplified schematic diagram of a second coking tail gas treatment process according to 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 process of 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 device or a filtering device, 15 a gas-liquid separation section, 16 a desulfurization section oil collecting tank extraction port, 17 a washing water extraction pipeline, 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 circulating washing water extraction pipeline, 25. a desaturation coking tail gas pipeline, 26, a circulating water washing pipeline, 27, a washing water pipeline, 28, a spraying facility and 29, a desulfurization coking tail gas pipeline.
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 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 to enter a draught fan 9, then enters a desaturator 11, is desaturated and then comes out of the top of the desaturator 11, enters a VOC (volatile organic compound) treatment facility 12 through a desaturated coking tail gas pipeline 25 to remove VOC (volatile organic compound), then is discharged, preferably, an emergency vent pipeline 10 (shown in figure 1) is arranged between the draught fan 9 and the desaturator 11, rich absorption liquid is pumped out from a desulfurization section oil collection tank extraction port 16 below the desulfurization section 13, enters an absorption liquid circulating pump 8 through a desulfurization section oil collection tank extraction pipeline 21, and returns, after the waste liquid is out of the waste liquid extraction pipeline 20, the waste liquid is sent to a treatment unit for treatment, the washing water in the tail gas treatment tower 3 flows downwards from the bottom of the tail gas treatment tower 3 through a washing water extraction pipeline 17, one part of the washing water flows out of the device through a washing sewage extraction pipeline 23, the other part of the washing water flows into a washing water circulating pump 7 through a circulating washing water extraction pipeline 24 for pressurization, and then the washing water enters the tail gas washing facility 2 through a circulating washing water pipeline 26 to be recycled as circulating washing water. The coking tail gas entering the desaturator 11 is subjected to desaturation process, the desaturated coking tail gas comes out from the top of the desaturator 11, and the liquid in the desaturator 11 comes out from the bottom of the desaturator 11 and can return to a coke pool.
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.
The desaturator 11 comprises a 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 distributing section has the main functions of trapping liquid and uniformly distributing gas, and can also play a role of a heat insulating plate to ensure that gas phase rising to the heating desaturation section cannot be back-mixed to the gas-liquid separation section.
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 washing water in the tail gas treatment tower 3 flows downwards from the bottom of the tail gas treatment tower 3 and flows out through a washing water extraction pipeline 17, one part of the washing water flows out of the device through a washing sewage extraction pipeline 23, the other part of the washing water flows into a washing water circulating pump 7 through a circulating washing water extraction pipeline 24 to be pressurized, and then the washing water is divided into two parts, one part of the washing water flows into the tail gas washing facility 2 through a circulating washing water pipeline 26 to be recycled as circulating washing water, the other part of the washing water flows into a spraying facility 28 through a washing water pipeline 27, and the coking tail gas flowing into a gas-liquid separation section 15 of the tail gas treatment tower.
As shown in fig. 3, it is different from fig. 1 in that the coke drum tail gas directly enters the gas-liquid separation section 15 in the tail gas treatment tower 3 through the 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 the 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, i.e. above the coke drum tail gas injection pipeline 1, below the coke drum tail gas and tail gas injection pipeline 6 generated by other equipment in the coking device (2 groups are shown in fig. 3). The washing water in the tail gas treatment tower 3 flows downwards from the bottom of the tail gas treatment tower 3 and flows out through a washing water extraction pipeline 17, one part of the washing water flows out of the device through a washing sewage extraction pipeline 23, the other part of the washing water flows into a washing water circulating pump 7 through a circulating washing water extraction pipeline 24 for pressurization, and then the washing water flows into 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.
As shown in fig. 4, the difference from fig. 2 is that the washing water in the tail gas treatment tower 3 flows downwards from the bottom of the tail gas treatment tower 3 through a washing water extraction line 17, enters a settling device or a filtering device 14 for settling or filtering, then the washing sewage containing solid particles flows out of a washing sewage extraction line 23, the clarified washing water enters a washing water circulating pump 7 through a circulating washing water extraction line 24 for pressurization, and then is divided into two parts, one part enters the tail gas washing facility 2 through a circulating water washing line 26 for recycling as circulating washing water, and the other part enters a spraying facility 28 through a washing water line 27 for further washing and cooling the coking tail gas entering the gas-liquid separation section 15 of the tail gas treatment tower 3.
Claims (27)
1. A coking tail gas treatment process 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, directly entering tail gas of a coke pool into the gas-liquid separation section of the tail gas treatment tower for washing and cooling, or entering the gas-liquid separation section of the tail gas treatment tower after washing and cooling;
2) and (2) carrying out gas-liquid separation on the material flow in the gas-liquid separation section of the tail gas treatment tower in the step 1), enabling gas-phase coking tail gas to ascend 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 desulfurized coking tail gas to come out of a desaturator for desaturation process after coming out of the top of the tail gas treatment tower, discharging the desaturated coking tail gas after removing VOC, pumping out rich absorption liquid from a desulfurization section oil collecting tank below the desulfurization section, returning to the upper part of the desulfurization section after pressurization, delivering waste liquid to a treatment unit for treatment after failure, enabling washing water in the tail gas treatment tower to come out of the bottom of the tail gas treatment tower downwards, enabling one part of washing water to be discharged from a device, and enabling the other part of.
2. The coking tail gas treatment process according to claim 1, characterized in that: and washing water in the tail gas treatment tower downwards flows out from the bottom of the tail gas treatment tower, after sedimentation or filtration, washing sewage containing solid particles flows out of the device, and the clarified washing water is pressurized and then is recycled as circulating washing water.
3. 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.
4. 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 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.
5. 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 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.
6. 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.
7. The coking tail gas treatment process according to claim 4, 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.
8. 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 the induced draft fan, then enters the desaturator to be desaturated, and the desaturated coking tail gas comes out from the desaturator to be emptied after VOC removal.
9. 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.
10. A coking tail gas treatment process according to claim 1 or 3 or 9, 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.
11. 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, a discharged steam quenching facility and a desaturator, wherein the tail gas treatment tower sequentially comprises a desulfurization section and a gas-liquid separation 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 tail gas treatment tower bottom is equipped with the washing water extraction pipeline, the washing water extraction pipeline communicates with washing sewage extraction pipeline and circulation washing water extraction pipeline respectively, circulation washing water extraction pipeline and washing water circulating pump entry intercommunication, washing water circulating pump export and tail gas washing facility intercommunication, tail gas treatment tower desulfurization section top is equipped with the 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 communicates with absorption liquid injection pipeline and waste liquid extraction pipeline respectively, tail gas treatment tower top is provided with the coking tail gas pipeline after the desulfurization, the coking tail gas pipeline after the desulfurization is linked together with desaturator and VOC processing facility in proper order.
12. The coking tail gas treatment plant of claim 11, 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 11, characterized in that: the bleed steam quench facility is disposed on the vent gas treatment tower.
14. The coking tail gas treatment plant of claim 11, characterized in that: the coking tail gas treatment device also comprises a sedimentation device or a filtering device, and the washing water extraction pipeline is respectively communicated with the washing sewage extraction pipeline and the circulating washing water extraction pipeline through the sedimentation device or the filtering device.
15. The coking tail gas treatment plant of claim 11, 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.
16. The coking tail gas treatment plant of claim 11, 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.
17. The coking tail gas treatment plant of claim 11, 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 desaturator and VOC processing facility in proper order, and the draught fan export is preferred to be equipped with urgent unloading pipeline with taking off on the pipeline between the saturator.
18. The coking tail gas treatment plant of claim 12, characterized in that: the tail gas washing facility is a Venturi scrubber.
19. The coking tail gas treatment plant of claim 13, characterized in that: the bleed steam quench facility is a venturi injection condenser.
20. The coking tail gas treatment plant of claim 11 or 13, characterized in that: the tail gas washing facility and/or the bleed steam quenching facility are arranged on the tail gas treatment tower tangentially.
21. 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, a desaturator and a spraying facility, wherein the tail gas treatment tower sequentially comprises a desulfurization section and a gas-liquid separation 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 tail gas injection pipelines 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 pipelines generated by other equipment in the coking device are respectively 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, a spraying facility is arranged below the desulfurization section oil collecting tank, the tail gas treatment tower bottom is equipped with the washing water and takes out the pipeline, the washing water takes out the pipeline and communicates with washing sewage pump line and circulation washing water pump line respectively, circulation washing water takes out the pipeline and communicates with washing water circulating pump entry, washing water circulating pump export is through washing water pipeline and spray facility intercommunication, tail gas treatment tower desulfurization section top is equipped with the absorption liquid injection line, desulfurization section sump oil case below is equipped with desulfurization section sump oil case pump outlet, desulfurization section sump oil case pump outlet passes through desulfurization section sump oil case pump line and absorption liquid circulating pump entry intercommunication, absorption liquid circulating pump export communicates with absorption liquid injection line and waste liquid pump line respectively, tail gas treatment tower top is provided with the coking tail gas pipeline after the desulfurization, the coking tail gas pipeline after the desulfurization links to each other with desaturator and VOC processing facility in proper order.
22. The coking tail gas treatment plant of claim 21, characterized in that: the coking tail gas treatment device also comprises a sedimentation device or a filtering device, and the washing water extraction pipeline is respectively communicated with the washing sewage extraction pipeline and the circulating washing water extraction pipeline through the sedimentation device or the filtering device.
23. The coking tail gas treatment plant of claim 21, 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.
24. The coking tail gas treatment plant of claim 21, characterized in that: the bleed steam quench facility is disposed on the vent gas treatment tower.
25. The coking tail gas treatment plant of claim 21, characterized in that: coking tail gas processing apparatus still includes the draught fan, and desulfurization back coking tail gas pipeline draught fan entry intercommunication, the draught fan export links to each other with desaturator and VOC processing facility in proper order, and the draught fan export is with take off the pipeline between the saturator and preferably be equipped with urgent blow-down pipeline.
26. The coking tail gas treatment plant of claim 21 or 24, characterized in that: the bleed steam quench facility is tangentially disposed on the tail gas treatment column.
27. The coking tail gas treatment plant of claim 24 or 26, characterized in that: the bleed steam quench facility is a venturi injection condenser.
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| CN201811215032.8A CN111068493B (en) | 2018-10-18 | 2018-10-18 | Coking tail gas treatment process and device |
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| CN201811215032.8A CN111068493B (en) | 2018-10-18 | 2018-10-18 | Coking tail gas treatment process and device |
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