CN106799113B - Method and device for treating waste gas of coke quenching tower - Google Patents
Method and device for treating waste gas of coke quenching tower Download PDFInfo
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- CN106799113B CN106799113B CN201710174445.5A CN201710174445A CN106799113B CN 106799113 B CN106799113 B CN 106799113B CN 201710174445 A CN201710174445 A CN 201710174445A CN 106799113 B CN106799113 B CN 106799113B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The invention discloses a method and a device for treating waste gas of a coke quenching tower, which are characterized by comprising the following steps: in the coke quenching process, a draught fan is used for introducing coke quenching waste gas into a spray absorption tower, so that the waste gas is contacted with cooling absorption liquid sprayed in the tower, and heat and pollutants in the coke quenching waste gas are absorbed by the absorption liquid; and a spraying system of the spray absorption tower is connected with a slurry pool of the spray absorption tower, so that absorption liquid forms a circulation in the tower, an induced draft fan and the spraying system in the tower are continuously operated in a gap in the process of quenching twice, air outside the tower is introduced into the spray absorption tower, and the absorption liquid is cooled through the air. The invention has the advantages of reasonable planning, low investment cost, low operation and maintenance cost, convenient operation, easy implementation, environmental protection and energy conservation, and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of energy conservation and environmental protection, and particularly relates to a method and a device for treating waste gas of a coke quenching tower.
Background
Most coking enterprises adopt the traditional wet quenching technology, namely, the red coke in a high-temperature state is cooled and extinguished in a water spraying mode. In the process, a large amount of water vapor and waste water and waste gas containing phenol, cyanogen, ammonia, sulfide and coke powder are generated, and if the waste water and the waste gas are not treated, pollutants can drift and diffuse to the inside and the outside, so that not only is serious environmental pollution caused, but also serious waste of water and heat energy is caused. The dry quenching technology adopts nitrogen to quench coke, generates and recovers heat energy, and adopts a dust collector to collect dust, but has the defects of high manufacturing cost, capability of only recovering dust and incapability of recovering fine particulate matters and gaseous pollutants. In order to reduce the coke quenching pollution, various coking plants have conducted various researches and attempts on the improvement of a wet coke quenching process, such as heightening a coke quenching tower body; the direct-discharging coke quenching tower is changed into a sealed coke quenching tower, and a heat exchanger is added on the top of the tower to recover heat and the like. However, as the coke quenching process is a periodic intermittent process, the coke is quenched once every several minutes or more than ten minutes, the quenching time is only 1-3 minutes, and the red coke temperature is rapidly reduced during coke quenching, so that a continuous and stable heat source cannot be provided.
Disclosure of Invention
The invention aims to design a method and a device for treating waste gas of a coke quenching tower, which are environment-friendly, energy-saving and low in implementation cost, and the technical scheme is as follows:
a method for treating waste gas of a coke quenching tower is characterized by comprising the following steps:
in the coke quenching process, a draught fan is used for introducing coke quenching waste gas into a spray absorption tower, so that the waste gas is contacted with cooling absorption liquid sprayed in the tower, and heat and pollutants in the coke quenching waste gas are absorbed by the absorption liquid;
the spraying system of the spray absorption tower is connected with the slurry pool, so that absorption liquid forms circulation in the tower, the induced draft fan and the spraying system in the tower are continuously operated in a gap in the process of quenching twice, air outside the tower is introduced into the spray absorption tower, and the absorption liquid is cooled through the air by utilizing the efficient heat transfer characteristic of fog drops.
On the basis of the scheme, the further improved or preferable scheme also comprises the following steps:
arranging a high-temperature pool and a low-temperature pool for heat storage, wherein a water inlet of the high-temperature pool is connected with a water outlet of a slurry pool of the spray absorption tower, a water outlet of the high-temperature pool is connected with an inlet of a heat source pipeline of a heat exchanger, an outlet of the heat source pipeline of the heat exchanger is connected with a water inlet of the low-temperature pool, and a water outlet of the low-temperature pool is connected with an absorption pool in the spray absorption tower through a delivery pump; in the gap of the two coke quenching processes, the liquid in the slurry pool of the spray absorption tower is conveyed to the high-temperature pool, and then the liquid in the low-temperature pool is conveyed to the spray absorption tower, so that the liquid in the low-temperature pool flows back to the slurry pool through a spray system.
The method comprises the following steps of (1) dividing a reaction zone of a spray absorption tower into a plurality of spray absorption sections which are connected in sequence, enabling each spray absorption section to correspond to an independent slurry pool unit, and monitoring the temperature of a high-temperature pool and the temperature of each slurry pool unit; and the slurry pool units are respectively connected with the high-temperature pool, automatic control valves are arranged on connecting pipelines of the slurry pool units and the high-temperature pool, and the valves are controlled by a control system to be switched on and off, so that absorption liquid with proper temperature is conveyed into the high-temperature pool, and the temperature of the liquid in the high-temperature pool is kept stable.
Or, the reaction zone of the spray absorption tower is divided into a plurality of spray absorption sections which are connected in sequence, each spray absorption section corresponds to an independent slurry pool unit, and the temperature of each slurry pool unit is monitored; and when the temperature of liquid in the slurry pond unit reaches a preset value, the valve is controlled to be opened, the heated absorption liquid is discharged into the high-temperature pond, and the valve of the slurry pond unit with the temperature lower than the preset value is in a closed state.
Treating liquid discharged from a slurry pool of the spray absorption tower by adopting a gas stripping process, and conveying waste gas discharged by gas stripping to gas storage equipment and a waste gas treatment system or to a coke oven for incineration; discharging the particles discharged by the gas stripping into a dephenolizing pool or a filtering system; the coke powder in the coke quenching waste gas absorbed in the absorption liquid is used as a carrier for absorbing benzene and phenols and a catalyst for removing the benzene and the phenols by an oxidation method, and the absorption liquid after gas stripping is discharged into a dephenolizing pool added with an oxidant to remove the benzene and the phenols absorbed in the absorption liquid; and filtering coke powder by the liquid discharged from the dephenolizing pool through a filter screen, and refluxing to a spray absorption tower through a spraying system.
The utility model provides a administer device of quenching tower waste gas, includes the spraying absorption tower, be equipped with thick liquid pond, spraying system and defroster in the spraying absorption tower from bottom to top, its characterized in that:
the device is also provided with a low-temperature pool and a high-temperature pool for heat storage, wherein a water inlet of the high-temperature pool is connected with a water outlet of a slurry pool of the spray absorption tower, a water outlet of the high-temperature pool is connected with an inlet of a heat source pipeline of a heat exchanger, an outlet of the heat source pipeline of the heat exchanger is connected with a water inlet of the low-temperature pool, and a water outlet of the low-temperature pool is connected with a spray system in the spray absorption tower; the gas inlet of the spray absorption tower is connected with a waste gas outlet of coke quenching equipment, the spray absorption tower introduces the waste gas or air into the spray absorption tower through a draught fan, and a slurry tank of the spray absorption tower is connected with a spraying system in the tower through a pipeline.
Furthermore, the reaction area of the spray absorption tower is divided into a plurality of spray absorption sections which are connected in sequence through partition plates, each spray absorption section corresponds to an independent slurry pool unit, each slurry pool unit is independently connected with the high-temperature pool, an automatic control valve is arranged on a pipeline for connecting the spray absorption section and the high-temperature pool and is connected with a control system, the device is provided with a temperature sensor for monitoring the temperature of each slurry pool unit, and the temperature sensor is connected with the control system.
The device is provided with an absorption liquid purification system, and the absorption liquid purification system comprises a gas stripping device, a dephenolization pool and a reflux liquid collecting pool. The slurry tank of the spray absorption tower is connected with the water inlet of the gas stripping device, the waste gas discharge port of the gas stripping device is connected with the coke oven through a gas output pipeline or is connected with the gas storage device or the waste gas treatment device, and the water outlet of the gas stripping device and the particulate matter discharge port are respectively connected with the dephenolization tank. The dephenolizing pool is provided with an oxidant adding port, the dephenolizing pool is communicated with the reflux liquid collecting pool through a water outlet at the bottom of the dephenolizing pool, a coke powder filter screen is arranged at a water outlet of the dephenolizing pool, and a water outlet at the upper part of the reflux liquid collecting pool is connected with the spray absorption tower through a conveying pipeline.
Has the beneficial effects that:
the invention treats the coke quenching waste gas in the spray absorption tower, can accumulate the heat in the coke quenching waste gas in the absorption liquid while absorbing the pollutants, and can radiate the heat of the absorption liquid in the coke quenching clearance by alternately introducing the waste gas and the air into the absorption tower and combining the circulation of the absorption liquid in the tower, so that the heat accumulation and the heat radiation of the absorption liquid can be completed in the device, and the time is saved. The invention further combines the design of the high-temperature pool and the low-temperature pool to construct a circulating system of the absorption liquid outside the tower, the waste heat in the waste gas is recovered through the heat exchanger, and the aim of controlling the stable output of heat can be realized by controlling the discharge of the absorption liquid in the slurry pool. The invention is different from the prior art that the heat exchanger is directly used for cooling the flue gas, but utilizes the high-efficiency heat transfer characteristic of the fog drops and utilizes the heat transfer and heat storage and heat transfer cooling of the fog drops, thereby greatly saving the investment cost. The invention has the advantages of reasonable planning, environmental protection, energy saving, low investment, operation and maintenance cost, convenient operation and easy implementation.
Drawings
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a third embodiment of the present invention.
Detailed Description
In order to clarify the technical solutions and principles of the present invention, the present invention is further described with reference to the following drawings and specific embodiments.
The first embodiment is as follows:
the device for treating the waste gas of the quenching tower shown in the figure 1 comprises a spray absorption tower and an absorption liquid purification system 16 outside the tower.
Be equipped with thick liquid pond 6, spraying system and defroster 23 in the spraying absorption tower from bottom to top, the body of the tower middle part is equipped with gas inlet 3, and the body of the tower top is equipped with purified gas outlet 2 in the top of defroster 23, 2 departments of purified gas outlet are equipped with draught fan 1, and the gas inlet 3 of spraying absorption tower is connected with the waste gas discharge port of quenching equipment, and the spraying absorption tower passes through draught fan 1 will quench coke waste gas or air and introduce in the spraying absorption tower.
The spray absorption tower is positioned in a reaction zone between the slurry pool 6 and the demister 23, four spray absorption sections which are connected in sequence are divided by partition plates with alternately opened top ends and bottom ends, and each spray absorption section corresponds to a single slurry pool unit. The coke quenching waste gas is continuously turned in the reaction zone, and the tail end (namely the flue gas turning part) of each clapboard is provided with an arc baffle 4 facing to the air flow for coarse demisting.
The spraying system consists of nozzles distributed in each spraying absorption section, a pipeline connected with the nozzles and a pump. The spraying system is connected with the slurry pool 6, and the absorption liquid sprayed by the nozzle is collected in the slurry pool and then returns to the spraying system through a pipeline to be sprayed, so that the absorption liquid forms circulation in the tower.
The absorption liquid purification system comprises a gas stripping tank 20, a dephenolization pool 18 and a reflux liquid collecting pool. Each slurry pool unit of the spray absorption tower is respectively connected with a water inlet of the gas stripping tank 20 and is respectively provided with an electronic valve 7, and because the concentration of pollutants absorbed in each slurry pool unit is different, in actual operation, absorption liquid in the slurry pool unit with the concentration of pollutants exceeding a preset index can be discharged into the gas stripping tank 20 through a control system. The waste gas discharge port of the gas stripping tank 20 is connected with a coke oven, gas storage equipment or waste gas treatment equipment through a gas output pipeline, and the water outlet and the particulate matter discharge port of the gas stripping tank 20 are respectively connected with the dephenolizing tank 18. The dephenolizing pool 18 is provided with an oxidant adding port, the backflow liquid collecting pool is arranged on one side of the dephenolizing pool 18, the dephenolizing pool 18 is communicated with the backflow liquid collecting pool through a water outlet at the bottom of the dephenolizing pool, a coke powder filter screen 17 is arranged at a water outlet of the dephenolizing pool 18, and a water outlet 19 positioned at the upper part of the backflow liquid collecting pool is connected with the spray absorption tower through a conveying pipeline.
The method for treating the waste gas of the coke quenching tower by using the device comprises the following steps:
1) In the coke quenching process of the coke quenching tower, starting a spraying system of a spray absorption tower and the induced draft fan 1, introducing coke quenching waste gas into the spray absorption tower by using the induced draft fan 1, enabling the coke quenching waste gas to be in contact with absorption liquid in the tower through spraying, and absorbing heat and pollutants in the coke quenching waste gas through the absorption liquid;
2) In the gap of the two coke quenching processes (namely, the stage that one coke quenching process is finished and the other coke quenching process is not started yet), continuously operating the induced draft fan 1 and the spraying system in the tower, introducing air outside the tower into the spray absorption tower by using the induced draft fan 1, enabling the spray in the tower to be contacted with the air, cooling the absorption liquid by the air, and closing the induced draft fan 1 and the spraying system after the temperature of the slurry in the slurry tank in the tower meets the requirement;
3) Discharging the absorption liquid in the slurry pool of the spray absorption tower into a gas stripping tank 20 through a purification pump 21, treating the liquid discharged from the slurry pool 6 of the spray absorption tower by adopting a gas stripping process, and discharging the waste gas from the gas stripping processQi (H) 2 S, HCN and the like) to gas storage equipment and waste gas treatment equipment or to a coke oven for incineration; discharging the particles discharged by gas stripping into a dephenolizing pool or a filtering system; the coke powder in the coke quenching waste gas absorbed in the absorption liquid is used as a carrier for absorbing phenols (the coke powder can absorb benzene, phenol and other pollutants) and a catalyst for dephenolization by an oxidation method (the coke powder can be used as a catalyst for the reaction of hydrogen peroxide and phenol), the absorption liquid after gas stripping is discharged into a dephenolization pool 18 added with hydrogen peroxide or other oxidants, and the phenols absorbed in the absorption liquid are removed; and filtering the coke powder by the liquid discharged from the dephenolizing pool 18 through a coke powder filter screen 17, and then refluxing to a spray absorption tower through a spraying system. When the coke powder in the absorption liquid can not meet the requirement of the catalytic reaction, the coke powder can be additionally added, and after a certain time (usually hundreds of hours), the inactivated coke powder needs to be replaced.
The second embodiment:
an apparatus for treating exhaust gas of a quenching tower as shown in fig. 2 and fig. 3 comprises a spray absorption tower and an absorption liquid purification system 16 outside the tower.
On the basis of the device of the first embodiment, the device of the present embodiment further includes a high temperature tank 14 and a low temperature tank 15 (in this application, the "high temperature tank" and the "low temperature tank" refer to both relatively speaking and are not a limitation on the temperature parameter). In this embodiment, a working system is provided outside the tower, the working system is composed of a heat exchanger 8, a steam turbine or expander or turbine 10, and the like, and the steam turbine or expander or turbine 10 is connected with a generator 9 to form a power generation system 13. The water inlet of the high-temperature pool 14 is connected with the water outlet of the slurry pool 6, the water outlet of the high-temperature pool 14 is connected with the heat source pipeline inlet of the heat exchanger 8, the outlet of the heat source pipeline of the heat exchanger is connected with the water inlet of the low-temperature pool 15, and the water outlet of the low-temperature pool 15 is connected with the spraying system in the spraying absorption tower.
The four slurry pool units are respectively and independently connected with the high-temperature pool 14, the pipelines for connecting the slurry pool units and the high-temperature pool 14 are provided with electronic valves 7, the device is respectively provided with temperature sensors for monitoring the temperature of each slurry pool unit, and the electronic valves 7 and the temperature sensors are respectively connected with the control system. In this device actual operation, because the heat in the waste gas is absorbed step by step, the absorption liquid temperature that is located the thick liquid pond unit of back end can be less than thick liquid pond unit temperature before, in this embodiment, the absorption liquid in the first thick liquid pond unit is after absorbing the waste gas heat, and its temperature heaies up to about 90 ~ 100 ℃, and the absorption liquid temperature in the last thick liquid pond unit is for being < 65 ℃.
The absorption liquid purification system comprises a gas stripping tank 20, a dephenolization tank 18 and a reflux liquid collecting tank. The slurry tank 6 of the spray absorption tower is connected with the water inlet of the gas stripping tank 20, the waste gas outlet of the gas stripping tank 20 is connected with a coke oven, gas storage equipment or waste gas treatment equipment through a gas output pipeline, and the water outlet and the particulate matter outlet of the gas stripping tank 20 are respectively connected with the dephenolizing tank 18. The dephenolizing pool 18 is provided with an oxidant adding port, the backflow liquid collecting pool is arranged on one side of the dephenolizing pool 18, the dephenolizing pool 18 is communicated with the backflow liquid collecting pool through a water outlet at the bottom of the dephenolizing pool, a coke powder filter screen 17 is arranged at a water outlet of the dephenolizing pool 18, and a water outlet 19 positioned at the upper part of the backflow liquid collecting pool is connected with the spray absorption tower through a conveying pipeline.
The method for treating the waste gas of the coke quenching tower by using the device comprises the following steps:
1) In the coke quenching process of the coke quenching tower, starting a spraying system of a spraying absorption tower and the induced draft fan 1, introducing coke quenching waste gas into the spraying absorption tower by using the induced draft fan 1, enabling the coke quenching waste gas to be in contact with cooling absorption liquid sprayed in the tower, and absorbing heat and pollutants in the coke quenching waste gas through the absorption liquid;
2) In the gap of the two coke quenching processes, according to the detection of a temperature sensor, opening an electronic valve of a slurry pool unit with the temperature of an absorption liquid higher than 65 ℃ through a control system, conveying the absorption liquid in the slurry pool unit into a high temperature pool 14, conveying the liquid in a low temperature pool 15 into a spray absorption tower through a low temperature pump 22, enabling the liquid in the low temperature pool 15 to flow back into a slurry pool 6 through a spraying system, continuously operating an induced draft fan 1 and an in-tower spraying system at the coke quenching gap stage, introducing air outside the tower into the spray absorption tower through the induced draft fan 1, enabling the spray in the tower to be contacted with the air, and cooling the absorption liquid through the air;
3) In the coke quenching process or the coke quenching clearance stage, the high-temperature pool 1 continuously and constantly conveys high-temperature absorption liquid to a heat exchanger 8 of a working system through a high-temperature pump;
4) The absorption liquid in the slurry pool of the spray absorption tower is discharged into a gas stripping tank 20 through a purification pump 21, the liquid discharged from the slurry pool 6 of the spray absorption tower is treated by a gas stripping process, and the waste gas discharged by gas stripping is conveyed into a gas storage device and a waste gas treatment device or can be conveyed into a coke oven for incineration; discharging the particles discharged by gas stripping into a dephenolizing pool; discharging the stripped absorption liquid into a dephenolizing pool 18 added with hydrogen peroxide or other oxidants by using coke powder in the coke quenching waste gas absorbed in the absorption liquid as a carrier for absorbing phenols and a catalyst for dephenolizing by an oxidation method, and removing the phenols absorbed in the absorption liquid; and filtering coke powder from the liquid discharged from the dephenolizing pool 18 through a coke powder filter screen 17, and then refluxing the liquid to a spray absorption tower through a spraying system.
In the process, the high-temperature absorption liquid exchanges heat with low-boiling-point organic working media (such as high-molecular-weight fluid, isentropic fluid, R245fa, R152a, R600, M12, R227ea, n-butane and the like) in the heat exchanger 8, then is cooled, and then is discharged into the low-temperature pool 15, and the absorption liquid in the low-temperature pool 15 can be further cooled by air outside the spray absorption tower after flowing back into the spray absorption tower. The organic working medium is vaporized in the heat exchanger 8 to push the expander, the steam turbine or the turbine to rotate and output power, and the generator 9 is driven to generate power or other equipment is driven to work. Because the high-temperature pool 14 continuously and stably provides heat for the power generation system 13, the power generation system 13 can be ensured to output balanced electric power outwards, and the organic working medium is pumped into the heat exchanger 8 by the working medium pump to continue circulation after being subjected to heat exchange and condensation by the cold source 12 in the condenser 11.
Example three:
as shown in fig. 4, on the basis of the second embodiment, the heat exchanger 8 can also supply heat to other heat-consuming devices. In order to stabilize the heat output by the high temperature tank 14, the temperature of the high temperature tank 14 and each slurry tank unit can be monitored by a sensor, and the on-off of each electronic valve is controlled by a control system, so that the absorption liquids with different temperatures in different slurry tanks are blended in the high temperature tank, and the temperature of the liquid in the high temperature tank 14 is maintained in a constant numerical range.
In order to save energy, the induced draft fan 1 can be provided with a high-power fan and a low-power fan, the high-power fan and the low-power fan operate simultaneously in the coke quenching process, waste gas in a coke quenching tower is introduced, the high-power fan is turned off in a coke quenching gap, and air is introduced only through the low-power fan.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the foregoing description only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, specification, and equivalents thereof.
Claims (4)
1. A method for treating waste gas of a coke quenching tower is characterized by comprising the following steps:
in the coke quenching process, a draught fan is used for introducing coke quenching waste gas into a spray absorption tower, so that the waste gas is contacted with cooling absorption liquid sprayed in the tower, and heat and pollutants in the coke quenching waste gas are absorbed by the absorption liquid;
the spraying system of the spray absorption tower is connected with the slurry pool, so that absorption liquid forms circulation in the tower, the induced draft fan and the spraying system in the tower are continuously operated in a gap between two coke quenching processes, air outside the tower is introduced into the spray absorption tower, and the absorption liquid is cooled by the air by utilizing the efficient heat transfer characteristic of fog drops;
arranging a high-temperature pool and a low-temperature pool for heat storage, wherein a water inlet of the high-temperature pool is connected with a water outlet of a slurry pool of the spray absorption tower, a water outlet of the high-temperature pool is connected with an inlet of a heat source pipeline of a heat exchanger, an outlet of the heat source pipeline of the heat exchanger is connected with a water inlet of the low-temperature pool, and a water outlet of the low-temperature pool is connected with the spray absorption tower through a delivery pump;
in the gap of the two coke quenching processes, liquid in the slurry pool of the spray absorption tower is conveyed to the high-temperature pool, and then the liquid in the low-temperature pool is conveyed into the spray absorption tower, so that the liquid in the low-temperature pool is continuously cooled through heat exchange between a spray system and cold air for next coke quenching.
2. The method of remediating quench tower exhaust gas as recited in claim 1, wherein:
dividing a reaction zone of the spray absorption tower into a plurality of spray absorption sections which are connected in sequence, enabling each spray absorption section to correspond to an independent slurry pool unit, and monitoring the temperature of a high-temperature pool and each slurry pool unit;
each slurry pool unit is respectively connected with the high-temperature pool, automatic control valves are arranged on connecting pipelines of the slurry pool units and the high-temperature pool, the control system controls the on-off of each valve, absorption liquid with proper temperature is conveyed into the high-temperature pool, and the temperature of the liquid in the high-temperature pool is kept stable.
3. The method for treating coke quenching tower waste gas as claimed in claim 1, wherein:
dividing a reaction zone of the spray absorption tower into a plurality of spray absorption sections which are connected in sequence, enabling each spray absorption section to correspond to an independent slurry pool unit, and monitoring the temperature of each slurry pool unit;
and when the temperature of the liquid in the slurry tank unit reaches a preset value, the valve is controlled to be opened, the heated absorption liquid is discharged into the high-temperature tank, and the valve of the slurry tank unit with the temperature lower than the preset value is in a closed state.
4. The method of remediating quench tower exhaust gas as recited in any one of claims 1-3, wherein:
treating liquid discharged from a slurry pool of the spray absorption tower by adopting a gas stripping process, and conveying waste gas discharged by gas stripping to gas storage equipment and a waste gas treatment system or to a coke oven for incineration; discharging the particles discharged by the gas stripping into a dephenolizing pool or a filtering system; the coke powder in the coke quenching waste gas absorbed in the absorption liquid and the coke powder in a coking plant are used as carriers for adsorbing phenols and catalysts for dephenolization by an advanced oxidation method, the absorption liquid subjected to gas stripping is discharged into a dephenolization pool added with an oxidant, and the benzene and the phenols absorbed in the absorption liquid are removed; and filtering coke powder from the liquid discharged from the dephenolizing pool by a filter screen, and returning the liquid to the spray absorption tower.
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Denomination of invention: A Method and Device for Treating Waste Gas from Quenching Tower Effective date of registration: 20230417 Granted publication date: 20230317 Pledgee: Nanjing Bank Co.,Ltd. Nanjing Financial City Branch Pledgor: JIANGSU LANSHAN ENVIRONMENT TECHNOLOGY Co.,Ltd. Registration number: Y2023980038254 |
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