CN110898619A - Coking waste gas treatment process and filler treatment tower - Google Patents
Coking waste gas treatment process and filler treatment tower Download PDFInfo
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- CN110898619A CN110898619A CN201811073391.4A CN201811073391A CN110898619A CN 110898619 A CN110898619 A CN 110898619A CN 201811073391 A CN201811073391 A CN 201811073391A CN 110898619 A CN110898619 A CN 110898619A
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- waste gas
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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
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
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- Chemical Kinetics & Catalysis (AREA)
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- Treating Waste Gases (AREA)
Abstract
The invention provides a coking waste gas treatment process, and also provides a filler treatment tower matched with the process, wherein the coking waste gas can be condensed and recycled into other gases after being purified by performing multi-stage filtration treatment, heat exchange treatment and spraying treatment on the coking waste gas, the heat exchange can not only reduce the temperature of the coking waste gas, but also use the part of heat energy as the power of an air temperature regulator, so that the energy consumption is reduced, the energy is saved, and in addition, particularly, the secondary heat exchange can further reduce the temperature of the waste gas and promote the dissolution of substances which are not dissolved in spraying liquid in the waste gas, so that the purification effect is improved.
Description
Technical Field
The invention relates to waste gas treatment, in particular to a coking waste gas treatment process, and also relates to a filler treatment tower.
Background
The waste gas discharged in the coking production mainly comes from coal preparation, coking and chemical product recovery and refining workshops, wherein the waste gas discharged in the coking process of coal charging, coke discharging and coke quenching has large amount and high dust concentration, and also contains toxic and harmful pollutants, such as benzene soluble matters (BSO), Polycyclic Aromatic Hydrocarbons (PAH), sulfur dioxide, nitrogen oxides, hydrogen sulfide, carbon monoxide, ammonia and the like, and the benzene soluble matters (BSO) and the Polycyclic Aromatic Hydrocarbons (PAH) are potential carcinogens and are important substances for controlling environmental pollution. The existing coking waste gas treatment and recovery process needs to be improved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a coking waste gas treatment process, which can collect and purify waste gas generated in the coking process, and recycle and cool the purified gas again, so that the cooling air intake is reduced, and the final waste gas treatment amount and discharge amount are reduced.
The technical scheme of the invention is to provide a coking waste gas treatment process, which comprises the following steps:
(1) coking waste gas enters the filler treating tower through a waste gas inlet;
(2) the process of the waste gas entering the filler treatment tower is as follows:
a. the waste gas is firstly sprayed with water to remove most soluble substances in the waste gas;
b. the waste gas after water spraying enters a first-stage filter to primarily remove particulate matters in the waste gas;
c. then the waste gas is filtered by a second stage and a third stage to remove the particulate matters in the waste gas again;
d. reducing the temperature of the waste gas after the secondary and tertiary filtration through primary heat exchange, and removing soluble substances at a lower temperature through water spraying again;
e. d, performing four-stage filtration on the waste gas treated in the step d to ensure that harmful substances in the waste gas are fully filtered, and then further reducing the gas temperature through secondary heat exchange; until the exhaust gas has been substantially completely purified;
(3) and (3) reducing the temperature of the gas treated in the step (2) to 20-40 ℃ by using an air temperature regulator, wherein the cooled gas can enter a condensation recovery system to be used as a condensation medium.
Further, the coking waste gas temperature in the step (1) is 200-380 ℃.
Further, the ratio of the water amount in the water spray a in the step (2) to the waste gas is 6 kg: 1m3。
Further, the temperature of the exhaust gas after the primary heat exchange in step (2) d is reduced to 50-60 ℃.
And (3) before entering the air temperature regulator, the gas in the step (3) is subjected to five-stage filtration to further improve the gas cleanliness.
The invention also provides a filler treating tower matched with the coking waste gas treatment process, which comprises the following steps:
the tower bottom is provided with a waste gas inlet, the tower top is provided with an air temperature regulator, a waste gas outlet and a fan, the waste gas outlet can be communicated with the condensation recovery device, and the fan comprises an exhaust fan for extracting gas in the filler treatment tower and a blower for feeding purified gas into the condensation recovery device;
the packing treatment tower is sequentially provided with a spraying unit I, a primary filter II, an intermediate filter, a primary heat exchanger, a spraying unit II, a high-efficiency filter and a secondary heat exchanger according to the waste gas inlet direction, wherein the gas passing path lengths of the primary filter I and the intermediate filter are the same, and the ratio of the gas passing path length of the primary filter I or the intermediate filter to the gas passing path length of the primary filter II is 1: 4.
Furthermore, a pre-cooling filter is further disposed at the front end of the air temperature regulator (the front end is close to the air inlet direction), and a high-efficiency filter is mainly selected to improve the filtering precision of the air before entering the air temperature regulator.
Furthermore, the spraying units I and II are provided with water receiving plates, the water receiving plates are slightly recessed from the edges to the center, and a waste liquid processor is arranged below the water receiving plates.
Further, the bottom of the waste liquid processor is provided with a waste liquid collecting tank and a waste liquid outlet for collecting and draining the spraying liquid to a recovery device or directly discharging the harmless liquid.
Furthermore, the length ratio of the gas passing paths of the spraying unit I and the spraying unit II is 3:1, so that the equipment volume is reduced and the energy consumption is saved under the condition of ensuring complete absorption of soluble substances and particles in the waste gas.
Further, gas is adjusted through the governing valve before entering primary filter I after spraying unit I to control total amount of wind and fan efficiency and filter, the unit of spraying, heat exchanger efficiency at different levels and mutually support, improve the return air utilization ratio.
The invention has the advantages and beneficial effects that: the coking waste gas is subjected to multistage filtration treatment, heat exchange treatment and spraying treatment, the coking waste gas can be purified and then can be put into other waste gases for condensation, wherein the heat exchange can not only reduce the temperature of the waste gas, but also can use the part of heat energy as the power of an air temperature regulator, the energy consumption is reduced, the energy is saved, and in addition, particularly, the secondary heat exchange can further reduce the temperature of the waste gas and promote the dissolution of substances which are not dissolved in spraying liquid in the waste gas, so that the purification effect is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of a packed column according to the invention.
Reference numerals: 1-waste gas inlet, 21-primary filter I, 22-primary filter II, 23-intermediate filter, 24-high efficiency filter, 25-pre-cooling filter, 3-regulating valve, 41-spraying unit I, 42-spraying unit II, 51, 52-water-receiving plate, 61-primary heat exchanger, 62-secondary heat exchanger, 7-air temperature regulator, 81-waste liquid collecting tank, 82-waste liquid outlet, 9-waste liquid processor
Detailed Description
The present invention will be further described with reference to the following embodiments.
The technical scheme of the invention is to provide a coking waste gas treatment process, which comprises the following steps:
(1) coking waste gas with the temperature of 200-380 ℃ enters the filler treating tower through the waste gas inlet 1;
(2) the process of the waste gas entering the filler treatment tower is as follows:
a. the waste gas is firstly sprayed with water to remove most soluble substances in the waste gas; the proportion of the water consumption for spraying and the waste gas is 6 kg: 1m3(ii) a Soluble substances in the waste gas can be better absorbed on the premise of ensuring that the water consumption is less in the proportion;
b. the water-sprayed exhaust gas is subjected to primary filtration to primarily remove particulate matter in the exhaust gas,
c. the waste gas after the primary filtration is subjected to secondary and tertiary filtration to remove particulate matters in the waste gas again;
d. reducing the temperature of the waste gas after the secondary and tertiary filtration to 50-60 ℃ through primary heat exchange, and removing soluble substances at a lower temperature through water spraying again;
e. d, performing four-stage filtration on the waste gas treated in the step d to ensure that harmful substances in the waste gas are fully filtered, and then further reducing the gas temperature through secondary heat exchange; until the exhaust gas has been substantially completely purified;
(3) and (3) reducing the temperature of the gas treated in the step (2) to 20-40 ℃ by using an air temperature regulator, and re-introducing the cooled gas into a circular blowing system to realize recycling.
Wherein, the temperature of the waste gas is reduced to 50-60 ℃ after the first-stage heat exchange in the step (2), the components in the waste gas are greatly changed after the three-stage filtration and the water spraying, the interaction among gas phases and the interaction between the gas phases and the liquid phases are changed, and the substances which are insoluble in water under the original high-temperature state in the waste gas are further dissolved in the water and are removed by combining the temperature reduction.
In another improved embodiment, before the step (3) of gas enters the air temperature regulator, the gas is subjected to five-stage filtration to further improve the gas cleanliness.
The invention also provides a filler treating tower matched with the coking waste gas treatment process, which comprises the following steps:
the tower bottom is provided with a waste gas inlet 1, the tower top is provided with an air temperature regulator 7, a waste gas outlet and a fan, the waste gas outlet (not shown in the figure) is communicated with the condensation recovery device and is used as a condensation medium, and the fan comprises an exhaust fan for extracting gas in the filler treatment tower and a blower for feeding purified gas into the condensation recovery device; the device comprises an air temperature regulator 7 and a fan, wherein the air temperature regulator and the fan can be integrated (the air temperature regulator and the fan are integrated as shown in figure 1 of the invention), waste gas is purified, then enters the air temperature regulator to be cooled to 20-40 ℃, and then is sent to a condensation recovery device through a waste gas outlet by a blower;
the packing treatment tower is sequentially provided with a spraying unit I41, a primary filter I21, a primary filter II 22, a medium-efficiency filter 23, a primary heat exchanger 61, a spraying unit II 42, a high-efficiency filter 24 and a secondary heat exchanger 62 according to the entering direction of waste gas, wherein the gas passing path lengths of the primary filter I21 and the medium-efficiency filter 23 are the same, and the ratio of the gas passing path length of the primary filter I21 or the medium-efficiency filter 23 to the gas passing path length of the primary filter II 22 is 1: 4.
In a further improved embodiment, the front end of the air temperature regulator 7 is further provided with a pre-temperature-reduction filter 25, which is mainly selected as a high-efficiency filter to improve the filtering accuracy of the gas before entering the air temperature regulator.
In another modified embodiment, the spraying unit I41 is provided with a water receiving plate 51, the spraying unit II 42 is provided with a water receiving plate 52, the water receiving plates 51 and 52 are slightly recessed from the edge to the center so as to facilitate collecting waste liquid, and a waste liquid processor 9 (for example, an activated carbon absorber can be selected) is arranged below the water receiving plates 51 and 52 so as to facilitate processing harmful substances in the waste liquid.
In a further improved embodiment, the bottom of the waste disposer 9 is provided with a waste collection tank 81, a waste outlet 82 for collecting and draining the spray liquid to a recovery device or for discharging the harmless liquid directly.
In another modified embodiment, the length ratio of the gas passing paths of the spraying units I41 and II 42 is 3:1, the spraying units I, II are all composed of a plurality of layers of spraying plates with nozzles, the gas passing path ratio is 3:1, the ratio of the arrangement heights of the spraying units I41 and II 42 is 3:1 in the packing treatment tower, and the distances between the adjacent spraying plates are the same; the volume of the equipment is reduced and the energy consumption is saved under the condition of ensuring that soluble substances and particles in the waste gas are completely absorbed.
In another improved embodiment, the gas passes through the spraying unit I41 and enters the primary filter I21, and is adjusted by the adjusting valve 3 so as to control the overall air volume and the fan efficiency and the efficiency of each stage of filter, spraying unit and heat exchanger to cooperate with each other.
The working process of the equipment is as follows:
coking waste gas with the temperature of 200-380 ℃ enters the filler treatment tower through the waste gas inlet 1 of the waste gas inlet 1, the gas is basically purified and is reduced in temperature after passing through the spraying unit I41, the primary filter I21, the primary filter II 22, the intermediate filter 23, the primary heat exchanger 61, the spraying unit II 42, the high-efficiency filter 24 and the secondary heat exchanger 62 at one time, and then the gas enters the air temperature regulator 7 for further cooling, is sent out through the waste gas outlet and can be sent into the condensation recovery device. The spray water used by the spray unit passes through the waste liquid processor 9 and then is discharged out of the filler treatment tower through the waste liquid collection tank 81 and the waste liquid outlet 82.
Materials, reagents and experimental equipment related to the embodiment of the invention are all commercial products in accordance with the field of waste gas treatment if no special description is provided.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, modifications and decorations can be made without departing from the core technology of the present invention, and these modifications and decorations shall also fall within the protection scope of the present invention. Any changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (8)
1. The coking waste gas treatment process is characterized by comprising the following steps:
(1) coking waste gas enters the filler treating tower through a waste gas inlet;
(2) the process of the waste gas entering the filler treatment tower is as follows:
a. the waste gas is firstly sprayed with water to remove most soluble substances in the waste gas;
b. the waste gas after water spraying enters first-stage filtration to primarily remove the particulate matters in the waste gas, and then the waste gas is subjected to second-stage and third-stage filtration to remove the particulate matters in the waste gas again;
c. reducing the temperature of the waste gas after the three-stage filtration through first-stage heat exchange, and removing soluble substances at a lower temperature through water spraying again;
d. c, performing four-stage filtration on the waste gas treated in the step c to ensure that harmful substances in the waste gas are fully filtered, and then further reducing the gas temperature through secondary heat exchange; until the exhaust gas has been substantially purified;
(3) and (3) reducing the temperature of the gas treated in the step (2) to 20-40 ℃ by using an air temperature regulator, wherein the cooled gas can enter a condensation recovery system to be used as a condensation medium.
2. The coking waste gas treatment process according to claim 1, characterized in that the coking waste gas temperature in the step (1) is 200-380 ℃.
3. A coking waste gas treatment process according to claim 1, characterized in that the ratio of the amount of water in the water spray a of step (2) to the waste gas is 6 kg: 1m3And (c) reducing the temperature of the waste gas to 50-60 ℃ after the primary heat exchange in the step (2).
4. The coking waste gas treatment process of claim 1, further comprising five stages of filtration to further improve gas cleanliness before the step (3) gas enters the air temperature regulator.
5. The packing tower for the coking waste gas treatment process according to any one of claims 1 to 4, characterized in that a waste gas inlet is arranged at the bottom of the tower, an air temperature regulator, a waste gas outlet and a fan are arranged at the top of the tower, the waste gas outlet can be communicated with a condensation recovery device, and the fan comprises an exhaust fan for extracting gas in the packing tower and a blower for feeding purified gas into the condensation recovery device;
the packing treatment tower is sequentially provided with a spraying unit I, a primary filter II, an intermediate filter, a primary heat exchanger, a spraying unit II, a high-efficiency filter and a secondary heat exchanger according to the waste gas inlet direction, wherein the gas passing path lengths of the primary filter I and the intermediate filter are the same, and the ratio of the gas passing path length of the primary filter I or the intermediate filter to the gas passing path length of the primary filter II is 1: 4.
6. The packing handling tower of claim 5, wherein the air temperature conditioner front end is provided with a pre-chill filter.
7. The packing treatment tower according to claim 5, wherein the spray unit I and the spray unit II are both provided with water receiving plates, the water receiving plates are slightly recessed from the edges to the center, and a waste liquid treater is arranged below the water receiving plates; the bottom of the waste liquid processor is provided with a waste liquid collecting tank and a waste liquid outlet.
8. The packing treatment tower of claim 5, wherein the gas passage path length ratio of the spray unit I to the spray unit II is 3: 1; and an adjusting valve for controlling the air volume is arranged between the spraying unit I and the primary filter I.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811073391.4A CN110898619A (en) | 2018-09-14 | 2018-09-14 | Coking waste gas treatment process and filler treatment tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811073391.4A CN110898619A (en) | 2018-09-14 | 2018-09-14 | Coking waste gas treatment process and filler treatment tower |
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| Publication Number | Publication Date |
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| CN110898619A true CN110898619A (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811073391.4A Pending CN110898619A (en) | 2018-09-14 | 2018-09-14 | Coking waste gas treatment process and filler treatment tower |
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Citations (7)
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2018
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| US20070189947A1 (en) * | 2006-02-14 | 2007-08-16 | Wen-Hao Lin | Method for purifying exhaust of waste gas using atomized fluid droplets combined with turbulent flow |
| CN102357310A (en) * | 2011-10-20 | 2012-02-22 | 太仓塑料助剂厂有限公司 | Waste gas processing method |
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| CN107930377A (en) * | 2017-11-20 | 2018-04-20 | 湖北徐风环保科技有限公司 | A kind of biology spray absorber and minimum discharge wet-esp technique |
| CN107830593A (en) * | 2017-12-06 | 2018-03-23 | 宁波大发化纤有限公司 | A kind of synthetic fiber spinning return air air-conditioning device |
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