CN212687971U - Coke pool sealing and tail gas treatment system of delayed coking device - Google Patents
Coke pool sealing and tail gas treatment system of delayed coking device Download PDFInfo
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- CN212687971U CN212687971U CN202021711724.4U CN202021711724U CN212687971U CN 212687971 U CN212687971 U CN 212687971U CN 202021711724 U CN202021711724 U CN 202021711724U CN 212687971 U CN212687971 U CN 212687971U
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Abstract
The utility model relates to a coke pool sealing and tail gas treatment system of a delayed coking device, wherein a decoking pool and a coke storage pool are arranged in the coke pool, a flushing pipeline is arranged at the upper end of a coke discharging channel, the lower end of the coke discharging channel is communicated with the decoking pool, the coke pool, coke transfer equipment and the like are completely wrapped in a closed space through a sealing coke shed, and the waste gas generated by decoking a coke tower is organically collected and treated, so that the unorganized emission of tail gas and dust during decoking is prevented; a shielding cover and a gas collecting cover are arranged above the decoking pool, so that decoking tail gas is reduced from diffusing in the closed coke shed, corrosion of the tail gas to equipment in the closed coke shed is reduced, and the grab bucket crane can not work during decoking, so that the coke removing system is safer; and, the utility model discloses when solving the unorganized emission problem of decoking waste gas, utilize existing equipment as far as possible, the transformation degree of difficulty is low, reduces user's cost, realizes that device production is steady, has the security height, reforms transform the characteristics that the time limit for a project is short, with low costs.
Description
Technical Field
The utility model belongs to the technical field of the inorganization of atmospheric pollutants discharges control and administers, more specifically, the utility model relates to an oil refining trade postpones the inorganization of coking device decoking tail gas and discharges control and processing system.
Background
The delayed coking device in the oil refining industry is a heavy oil deep processing technology for converting heavy oil into gas, light and medium distillate oil and coke through deep thermal cracking, has the characteristics of thorough decarburization, simple flow, mature technology, low device investment and the like, and becomes one of important technologies in the heavy oil processing technology.
With the increase of the proportion of heavy crude oil and poor crude oil and the development of deep processing of crude oil, the position of delayed coking in processing heavy crude oil and poor crude oil is more and more important, the yield of petroleum coke is continuously increased, decoking and coke conveying are important links in the process of delayed coking, hydraulic decoking in the prior art is commonly used in a delayed coking device, the petroleum coke in a coke tower is cut by high-pressure water, and then coking water flows into a coke storage tank through an inclined chute. The coke storage tank is open, and during decoking, mixed gas containing sulfide, organic volatile matters, a small amount of dust and a large amount of water vapor volatilizes from the upper tower opening of the coke tower and the coke tank, so that air pollution around the coke storage tank is serious, and certain pressure is caused to the surrounding environment. During decoking, coke is accumulated at a coke sliding notch of a coke storage tank, a grab bucket crane is needed to grab and transfer the coke near the coke sliding notch to a coke storage area of the coke storage tank for draining and storing, and the dewatered coke is transferred to an outward transport train or an automobile or a blanking hopper of a belt type conveying system by the grab bucket crane. In the coke transfer process of the grab crane, the material is inevitably scattered, the coke and the coke powder pollute the surrounding environment, the environmental protection standard is gradually improved, and the problem is solved, so that the problem to be solved is urgently solved for most petrochemical enterprises.
At present, the domestic effective scheme is a closed decoking technology developed by medium petrochemistry, see patent CN201710323797.2, the existing open-type large coke pool is transformed into a closed small coke pool, a spiral material taking machine is used for replacing a grab bucket crane to convey coke, the method solves the problem of unorganized emission of waste gas, but the transformation project amount is large, the investment cost is high, the transformation period is long, and most petrochemical enterprises still wait for observation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art's defect, the utility model is to provide a delay coking device coke chest is airtight and tail gas processing system, through set up the decoking pond in the coke chest, the decoking pond top sets up and shields the cover, arranges burnt passageway upper end and sets up the flushing line to and set up measures such as airtight burnt canopy, realize the tail gas collection and the processing of overall process, and the existing equipment of very big possible utilization need not to carry out extensive transformation, has the security height, and the transformation time limit for a project is short, characteristics with low costs.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a coke tank sealing and tail gas treatment system of a delayed coking device comprises a coke tower, a coke tank, a coke transfer device and a sealing coke shed, wherein a flat plate top cover valve is arranged at the top of the coke tower, a flat plate bottom cover valve is arranged at the bottom of the coke tower, a coke crusher is arranged below the flat plate bottom cover valve, an inclined coke discharge channel is arranged below the coke crusher, the coke tank comprises a decoking tank and a coke storage tank, the decoking tank is adjacent to a coke discharge channel of the coke tower, the coke storage tank is arranged at the periphery of the outer side of the decoking tank, the coke tank and coke transfer equipment are completely wrapped in a sealing space by the sealing coke shed, a sedimentation tank, a lifting water tank and a coke discharge funnel are further arranged in the sealing coke shed, the coke transfer equipment is positioned above the coke tank and the coke discharge funnel, a flushing pipeline is arranged at the upper end of the coke discharge channel, the lower end of the coke discharge channel is communicated with the decoking tank in the sealing coke shed, and water and coke flowing down through, the effective volume of the decoking tank is larger than the maximum volume of coke in the coke tower; the top of the closed coke shed and the upper part of the decoking pool are respectively provided with a gas collecting hood, the upper ends of the gas collecting hood and the flat top cover valve in the closed coke shed are respectively connected to a tail gas treatment system through tail gas pipelines, and the tail gas treatment system is connected with a fan.
And a shielding cover is also arranged above the decoking pool, is opened to shield the decoking pool during decoking and is retracted to open the decoking pool after decoking is finished.
The top of the closed coke shed is provided with a skylight, and the side wall of the closed coke shed close to one side of the coke outlet funnel is provided with an electric ventilation valve and a lighting window.
The coke transfer equipment is a grab bucket crane, a plurality of grab bucket cranes can be arranged in the closed coke shed, and the grab bucket crane can be operated on site in the closed coke shed and also can be remotely operated and automatically operated outside the closed coke shed.
The outlet of the coke discharging channel is positioned at the upper side of the decoking pool, the upper part of the wall body of the decoking pool is provided with an overflow port, and the lower part is provided with a drain valve.
The delayed coking device further comprises a decoking water tank, the decoking water tank is arranged outside the closed coke shed, a flushing water pump is connected beside the decoking water tank and connected with a flushing pipeline to the upper end of the coke discharging channel, a lifting water pump is arranged in the lifting water tank, and a drainage pipe of the lifting water pump is connected to the upper part of the decoking water tank to realize water recycling.
An automobile loading platform or a belt conveyor is arranged below the coke discharging hopper.
The shielding cover above the decoking pool is a soft curtain which can be curled or folded or a hard cover which can be translated.
Has the advantages that:
1. the utility model discloses set up airtight burnt canopy, when the coke drum decoking, close skylight, electronic ventilation valve, adopt airtight burnt canopy will decoking the pond, store up burnt pond, sedimentation tank, promotion pond, grab bucket hoist, play burnt funnel etc. and all wrap up in the enclosure space, the waste gas that the coke drum decoking produced carries out organized collection and processing, tail gas, dust inorganization emission that exceeds standard when preventing to decoke.
2. The utility model discloses an in the burnt pond except storing up the burnt pond, set up the decoking pond in addition, arrange burnt passageway upper end and set up the flushing line, when decoking, the sparge water promotes the coke after the breakage to flow in the decoking pond, water and coke are piled up simultaneously and are stored in the decoking pond, the promotion of sparge water and the mobility of the interior water of decoking pond make the coke can not pile up at the export of the channel of removing coke and form the jam, need not frequently transport and clear up the coke that the channel of removing coke exported during the decoking, grab bucket crane can be out of work during the decoking, it is safer; set up and shield cover and gas collecting cover above the decoking pond, the tail gas of decoking pond department is collected in the confined space that shields the cover formation during the decoking, reduces decoking tail gas and spreads in airtight burnt canopy, reduces the corruption of tail gas to equipment such as steel structure in the airtight burnt canopy, hoist, realizes effectively collecting and handling waste gas under the airtight environment.
3. The utility model discloses when solving the unorganized emission problem of decoking waste gas, utilize existing equipment as far as possible, need not to upgrade coke transportation equipment and reform transform and can use, when the coke drum decoking, airtight burnt canopy air is relatively poor, the grab bucket hoist is out of work, does not need personnel to get into airtight burnt canopy, and is safer and do benefit to personnel's health; remove after the burnt, withdraw and cover, open electronic ventilation valve, continue to operate the fan and replace the air in airtight burnt canopy and accord with safe and healthy standard until the air in the burnt canopy, personnel reentrant behind the air qualification in the canopy are controlled the grab bucket hoist and are carried out coke and transport work, so, the traditional grab bucket hoist that the device had need not upgrade into expensive intelligent grab bucket hoist, reduce user's cost, it is steady to realize device production, has the security height, the transformation time limit for a project is short, characteristics with low costs.
The utility model discloses not only realized the collection and the processing of the tail gas of overall process, control the diffusion of decoking tail gas in airtight burnt canopy moreover, realize airtight burnt canopy internal gas time quantum and handle, cool down, take off admittedly, the desulfurization and take off the Voc processing to tail gas during decoking, mainly use ventilation, dust removal processing as leading when not decoking, reduced the cost of tail gas treatment system.
Drawings
FIG. 1 is a schematic diagram of the coke tank sealing and tail gas treatment system of the delayed coking device of the present invention.
Reference numerals: 1. the coke oven comprises a flat top cover valve, 2, a coke tower, 3, a flat bottom cover valve, 4, a coke breaker, 5, a coke discharge channel, 6, a flushing water pump, 7, a decoking water tank, 8, a decoking pool, 9, a coke storage pool, 10, a sedimentation pool, 11, a lifting water pool, 12, a lifting water pump, 13, a coke discharge funnel, 14, a lighting window, 15, an electric ventilation valve, 16, a grab bucket crane, 17, a closed coke shed, 18, a gas collecting hood, 19, a tail gas treatment system, 20, a fan, 21, a drain valve, 22, an overflow port, 23, a shielding hood, 24 and a skylight.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the coke pool sealing and tail gas treatment system of the delayed coking device comprises a coke tower 2, a coke pool and a coke transfer device, and further comprises a sealing coke shed 17, a tail gas treatment system 19 and a fan 20, wherein the coke pool and coke transfer equipment are completely wrapped in a closed space by the sealing coke shed 17.
The top of the coke tower 2 is provided with a flat plate top cover valve 1, the bottom of the coke tower 2 is provided with a flat plate bottom cover valve 3, a coke crusher 4 is arranged under the flat plate bottom cover valve 3, a tilted coke discharge channel 5 is arranged under the coke crusher 4, the coke discharge channel 5 is communicated with a coke pool in a closed coke shed 17, the coke pool comprises a decoking pool 8 and a coke storage pool 9, the decoking pool 8 is adjacent to the coke discharge channel 5 of the coke tower 2, the coke storage pool 9 is arranged at the periphery of the outer side of the decoking pool 8, a sedimentation pool 10, a lifting pool 11 and a coke discharge funnel 13 are further arranged in the closed coke shed 17, the coke transfer equipment is positioned above the coke pool, the decoking pool 8, the coke storage pool 9, the sedimentation pool 10, the lifting pool 11, the coke transfer equipment, the coke discharge funnel 13 and the like are all wrapped in a closed space by the closed coke shed 17, the upper end of the coke discharge channel 5 is provided with a flushing pipeline, and the lower end of the coke discharge channel 5 is communicated with, the arrangement of the flushing pipeline is more beneficial to discharging coke in the coke discharging channel 5, the outlet of the coke discharging channel 5 is preferably positioned at the upper part of the decoking pool 8, water and coke flowing down through the coke discharging channel 5 are stored and accumulated in the decoking pool 8 during decoking, due to the good fluidity of water, the coke is naturally flattened in the decoking pool 8 and cannot be accumulated at the outlet of the coke discharging channel 5 to form blockage, and the effective volume of the decoking pool 8 is larger than the maximum volume of the coke in the coke tower 2; a shielding cover 23 is further arranged above the decoking pool 8 in the closed coke shed 17, a plurality of gas collecting covers 18 are further arranged in the closed coke shed 17, the gas collecting covers 18 are respectively arranged at the top of the closed coke shed 17 and above the decoking pool 8, the gas collecting covers 18 above the decoking pool 8 are arranged between the shielding covers 23 and the decoking pool 8 and used for collecting waste gas above the decoking pool 8, the gas collecting covers 18 can also be distributed at other suitable positions in the closed coke shed 17, the shielding covers 23 are opened to shield the decoking pool 8 during decoking, the decoking pool 8 is opened after decoking is finished, the upper ends of the gas collecting covers 18 and the flat top cover valve 1 in the closed coke shed 17 are respectively connected to a tail gas treatment system 19 through tail gas pipelines, and the tail gas treatment system 19 is connected with a fan 20 to discharge the treated tail gas.
The top of the closed coke shed 17 is provided with a skylight 24, the skylight 24 can be opened and closed in a translation way or opened and closed in an overturning way, and the side wall of the closed coke shed 17 close to one side of the coke outlet funnel 13 is provided with an electric ventilation valve 15 and a lighting window 14; the coke transfer equipment is a grab bucket crane 16 and can also be other transfer equipment commonly used in the prior art, a plurality of grab bucket cranes 16 can be arranged in the closed coke shed 17, the grab bucket cranes 16 can be operated on site in the closed coke shed 17 and also can be operated remotely and automatically outside the closed coke shed 17, and an automobile loading platform or a belt conveyor can be arranged below the coke discharging hopper 13 to convey coke.
The purpose of setting up gas collecting channel 18 and shield cover 23 above decoking pond 8 is to shield decoking pond 8 when decoking, effectively collects waste gas in finite space, controls the diffusion of decoking tail gas in airtight burnt canopy 17, reduces the corruption to equipment in the canopy, decoking pond 8 keeps away from the wall body upper portion of row burnt passageway 5 one side and sets up overflow mouth 22, and the lower part sets up drain valve 21, and drain valve 21 closes during decoking, and accessible overflow mouth 22 flows out behind the full pond of sparge water, and when decoking ended, drain valve 21 opened the drainage.
The outside of airtight burnt canopy 17 still is equipped with decoking water tank 7, for the flushing line provides the water of washing, the washing water pump 6 is connected to decoking water tank 7 next door, washing water pump 6 connects the flushing line to row 5 upper ends of burnt passageway, 8 overflows in decoking pond or the water of discharged and the water that stores up 9 drivings in the burnt pond, flow into lifting water pond 11 after 10 purification of sedimentation tank, be equipped with lifting water pump 12 in the lifting water pond 11, lifting water pump 12's drain pipe is connected to 7 upper portions in decoking water tank, realize the cyclic reuse of water.
In some embodiments, the shielding cover 23 may be a flexible curtain capable of being rolled or folded, a rigid cover capable of being translated, or any other form capable of opening the decoking tank 8 during decoking and retracting the decoking tank 8 to open after decoking.
The cross section of the coke discharge channel 5 can be circular, rectangular or other common shapes.
The coke crusher 4 can be a double-toothed roller crusher or a single-toothed roller crusher.
The tail gas treatment system 19 can perform cooling, solid removal, desulfurization and Voc removal treatment on the tail gas during decoking.
The utility model discloses can realize airtight burnt canopy internal gas time share period and handle, cool down, take off admittedly, the desulfurization and take off the Voc processing to tail gas during decoking, mainly use ventilation, dust removal processing to be main when not decoking, reduced tail gas treatment system's cost, specific working process as follows:
before decoking begins: opening a flat top cover valve 1 and a flat bottom cover valve 3 on the coke tower 2; closing the skylight 24 of the closed coke shed 17 and the electric ventilation valve 15 to seal the closed coke shed 17; the grab crane 16 stops working; a shielding cover 23 above the decoking pool 8 is opened to shield the decoking pool 8; the drain valve 21 of the decoking tank 8 is closed, and the tail gas treatment system 19 and the fan 20 are started.
Wherein, adopt airtight burnt canopy 17 with decoking pool 8, storage coke pond 9, sedimentation tank 10, promotion pond 11, grab bucket hoist 16, play burnt funnel 13 etc. all parcel in the enclosure space, carry out organized collection and processing to the waste gas that coke tower 2 decoking produced, tail gas, dust unorganization emission that exceeds standard when preventing to decoke.
During decoking: starting the coke crusher 4, starting the flushing water pump 6, enabling the coke to pass through the flat bottom cover valve 3 and enter the coke crusher 4, enabling small coke to directly pass through the coke crusher 4, enabling large coke to pass through the crushed coke crusher 4, enabling the passed coke to fall into the coke discharge channel 5, and pushing the crushed coke to enter the decoking pool 8 by flushing water provided by the flushing water pump 6; water and coke are stored and stacked in the decoking tank 8, the coke at the outlet of the coke discharge channel 5 cannot be stacked and blocked by utilizing the good fluidity of the water, and can be naturally leveled, the decoking tank 8 can at least contain all the coke in one coke tower 2, and the coke is ensured not to be transported by a grab crane in the decoking process; after the washing water is full of the tank, the washing water can overflow through an overflow port 22 arranged on the decoking tank 8, the overflowed water automatically flows through a coke storage tank 9 to a sedimentation tank 10 for purification, the purified water automatically flows into a lifting water tank 11, and then a lifting water pump 12 is started as required to lift the water to a decoking water tank 7 for recycling; during decoking, tail gas discharged from the upper part of the coke tower 2 is conveyed to a tail gas treatment system 19 through the upper end of the flat plate top cover valve 1, tail gas discharged from the lower part of the coke tower 2 passes through a coke discharging channel 5 to a decoking pool 8, is conveyed to the tail gas treatment system 19 for treatment through collection of the gas collecting hood 18 under the shielding of the shielding hood 23, and the treated tail gas is discharged through the fan 20.
Tail gas of 8 departments of decoking pond is collected in the confined space that shields cover 23 formation during the decoking, can reduce decoking tail gas and spread in airtight burnt canopy 17, reduces the corruption of tail gas to equipment such as steel structure, hoist in airtight burnt canopy 17, and when coke drum 2 decoking, air is relatively poor in airtight burnt canopy 17, and grab bucket crane 16 is out of work, does not need personnel to get into airtight burnt canopy, and is safer and do benefit to personnel health.
After the decoking is finished, closing the flat top cover valve 1 and the flat bottom cover valve 3; opening an electric ventilation valve 15 of the closed coke shed 17 to ventilate the closed coke shed 17; at the moment, decoking tail gas is not discharged any more, and the shielding cover 23 above the decoking pool 8 is recovered to expose the decoking pool 8; stopping the operation of the coke crusher 4, and closing the washing water pump 6; and (3) opening a drain valve 21 of the decoking tank 8 to drain water, and continuously operating the tail gas treatment system 19 and the fan 20 to perform replacement treatment on the air in the closed coke shed 17 until the standard is met.
Transferring coke: after the coke removal is finished, coke transfer operation can be carried out, and if the grab bucket crane 16 needs to be operated under the condition that the air in the closed coke shed 17 does not reach the standard, the grab bucket crane 16 needs to be remotely operated or automatically operated; if the grab bucket crane 16 is operated on site in the traditional field, the personnel can enter the closed coke shed 17 to work after the air in the closed coke shed 17 is replaced qualified.
One of the coke transfer operations is to operate a grab bucket crane 16 to transfer the coke in the decoking pool 8 to a coke storage pool 9 for storage and draining, the drained water automatically flows into a sedimentation pool 10, the purified water in the sedimentation pool 10 automatically flows into a lifting water pool 11 for reuse, and the coke in the decoking pool 8 is emptied before next decoking; the second coke transfer operation is to operate a grab bucket crane 16 to transfer the coke in the coke storage tank 9 to a coke discharging hopper 13, and an automobile loading machine can be arranged below the coke discharging hopper 13 to convey the coke, and a belt conveyor can also be arranged below the coke discharging hopper 13 to convey the coke; during coke transfer, the air and dust can be treated using a tail gas treatment system 19 and a fan 20.
The utility model discloses with various technologies and equipment integration together, form the airtight and tail gas treatment system process route of the delayed coking device coke chest of an innovation, can effectively solve delayed coking device's tail gas inorganization emission problem, not only effectual, sexual valence relative altitude, operation are stable, reform transform the time limit for a project in addition short, do not influence the normal clear of main production technology.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any form, but all the technical matters of the present invention are still within the scope of the present invention, including any simple modification, equivalent change and modification made by the technical matters of the present invention to the above embodiments.
Claims (8)
1. The utility model provides an airtight and tail gas processing system of delayed coking device coke chest, includes coke drum, coke chest, coke transfer device and airtight burnt canopy, the coke drum top is provided with flat top cover valve, and the bottom is provided with flat bottom cover valve, sets up the coke breaker under the flat bottom cover valve, sets up the row's of slope burnt passageway, its characterized in that under the coke breaker: the coke pool comprises a decoking pool and a coke storage pool, the decoking pool is adjacent to a coke tower coke discharging channel, the coke storage pool is arranged at the periphery of the outer side of the decoking pool, the coke pool and coke transfer equipment are completely wrapped in a closed space by the closed coke shed, a sedimentation pool, a lifting pool and a coke discharging funnel are also arranged in the closed coke shed, the coke transfer equipment is positioned above the coke pool and the coke discharging funnel, a flushing pipeline is arranged at the upper end of the coke discharging channel, the lower end of the coke discharging channel is communicated with the decoking pool in the closed coke shed, water and coke flowing down through the coke discharging channel are stored and accumulated in the decoking pool during decoking, and the effective volume of the decoking pool is greater than the maximum volume of the coke in the coke tower; the top of the closed coke shed and the upper part of the decoking pool are respectively provided with a gas collecting hood, the upper ends of the gas collecting hood and the flat top cover valve in the closed coke shed are respectively connected to a tail gas treatment system through tail gas pipelines, and the tail gas treatment system is connected with a fan.
2. The coke chest sealing and tail gas treatment system of the delayed coking unit as claimed in claim 1, wherein a shielding cover is further arranged above the decoking chest, the shielding cover is opened to shield the decoking chest during decoking, and is retracted to open the decoking chest after decoking is finished.
3. The coke chest sealing and tail gas treatment system of a delayed coking unit according to claim 1, wherein the top of the closed coke shed is provided with a skylight, and the side wall of the closed coke shed close to one side of the coke discharging hopper is provided with an electric ventilation valve and a lighting window.
4. The delayed coker coke chest containment and tail gas treatment system of claim 1 wherein the coke transfer equipment is a grab crane, and wherein multiple grab cranes are located within the containment coke shed, the grab cranes being capable of operating either on-site within the containment coke shed or remotely and automatically outside the containment coke shed.
5. The coke chest sealing and tail gas treatment system of the delayed coking device as claimed in claim 1, wherein the outlet of the coke discharging channel is positioned at the upper side of the decoking chest, the upper part of the wall of the decoking chest is provided with an overflow port, and the lower part is provided with a drain valve.
6. The coke chest sealing and tail gas treatment system of the delayed coking device according to claim 1, wherein the delayed coking device further comprises a decoking water tank, the decoking water tank is arranged outside the closed coke shed, a flushing water pump is connected beside the decoking water tank, the flushing water pump is connected with a flushing pipeline to the upper end of the coke discharging channel, a lifting water pump is arranged in the lifting water tank, and a drain pipe of the lifting water pump is connected to the upper part of the decoking water tank, so that water recycling is realized.
7. The delayed coker coke drum containment and tail gas treatment system of claim 1 wherein an automobile loading platform or belt conveyor is located below the coke hopper.
8. The delayed coker coke drum containment and tail gas treatment system of claim 1 wherein the shield over the decoking drum is a flexible curtain that can be rolled or folded or a rigid cover that can be translated.
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| CN202021711724.4U CN212687971U (en) | 2020-08-17 | 2020-08-17 | Coke pool sealing and tail gas treatment system of delayed coking device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111808630A (en) * | 2020-08-17 | 2020-10-23 | 洛阳涧光特种装备股份有限公司 | Coke pool sealing and tail gas treatment system and method for delayed coking device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111808630A (en) * | 2020-08-17 | 2020-10-23 | 洛阳涧光特种装备股份有限公司 | Coke pool sealing and tail gas treatment system and method for delayed coking device |
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