CN103432892A - Technology for effectively controlling PM2.5 discharge - Google Patents
Technology for effectively controlling PM2.5 discharge Download PDFInfo
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- CN103432892A CN103432892A CN2013103469596A CN201310346959A CN103432892A CN 103432892 A CN103432892 A CN 103432892A CN 2013103469596 A CN2013103469596 A CN 2013103469596A CN 201310346959 A CN201310346959 A CN 201310346959A CN 103432892 A CN103432892 A CN 103432892A
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- flue gas
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Abstract
The invention discloses a technology for effectively controlling PM2.5 discharge, which is characterized by comprising the following steps: exhaust gas enters the absorption section of an absorption tower from the inlet and is in countercurrent contact with sprayed limestone absorption liquid, and SO2 in the exhaust gas is absorbed; then, the exhaust gas enters the washing section from the absorption section through a standpipe on a standpipe board, and is washed by wash water in the washing section provided with multiple rows of washing nozzles, and discharged to a chimney via a demister and an exhaust gas outlet. According to the invention, as the washing section is arranged in the absorption tower, the emission load of desulfurization products including gypsum in the exhaust gas, namely particulate matters (PM2.5) is reduced, and the air is purified.
Description
Background technology
The invention belongs to the environmental chemical engineering technical field, relate to the absorption tower adopted in coal burning flue gas desulfurization, to reduce the discharge capacity of PM2.5 in desulfurization operation.
Background technology
At present, for improving air environmental pollution, thermal power station's coal-burning boiler has been set up desulfurizer, but the discovery that is in operation, and (PM2.5) is more for the fine particle of carrying secretly in flue gas after desulfurization, one of reason that the haze weather number of days of certain areas is increased.Limestone-gypsum method for example, the content of gypsum in circulating absorption solution (calcium sulfate) is 15%, so the gypsum of carrying secretly in flue gas is more, these slurries enter moisture evaporation after atmosphere, have just formed the fine particle (PM2.5) of gypsum.In order to reduce the discharge of PM2.5, just should reduce as far as possible the concentration of the gypsum slurries of carrying secretly.
Summary of the invention
For above problem, the object of the present invention is to provide a kind of technique of effective control PM2.5 discharge, be the method that adopts water washing, washing section is set in absorption tower, reduce as far as possible the concentration of the gypsum slurries of carrying secretly, with in order to reduce the discharge of PM2.5.
Technical scheme of the present invention is achieved in the following ways: effectively control the technique of PM2.5 discharge, comprise the following steps: it is characterized in that: flue gas is entered the absorber portion on absorption tower by import, with the limestone slurry absorption liquid counter current contacting of spray, the S0 in flue gas
2be absorbed, then flue gas enters washing section by the riser on the riser plate by absorber portion, and flue gas is washed water washing in the washing section that is provided with many row's Washing spray nozzles, then enters to chimney through demister, flue gas discharge opening.
The riser plate is separated absorber portion and washing section, flue gas enters washing section by the riser on the riser plate by absorber portion, and each self-loopa of absorption liquid and cleaning solution, absorption liquid is delivered to the nozzle spray by storage tank through circulating pump, with flue gas adverse current, contact, and cleaning solution is delivered to nozzle by the washing liquid bath through detergent circulator, with flue gas adverse current, contact, and make the absorption liquid of carrying secretly in flue gas wash, then cleaning solution is collected on the riser plate, then flows in the washing liquid bath.
Described washings are fresh water (FW), first in the washing liquid bath, are filled with fresh water (FW), with cleaning solution, are pumped to the washing section washing; The liquid level of storage tank on absorption tower of being in operation is controlled a part of cleaning solution W
2be supplemented to absorption tower, the same liquid level according to storage tank is by W
1import department supplements fresh water (FW).
In described washing section, be divided into: spray column section, packing tower section and macroporous plate tower section form, its rising flue gas of spray column section contacts and washs with spray washing liquid, cleaning solution is washed by the nozzle ejection after washing liquid pump by the washing liquid bath, and flue gas is continuous phase, and cleaning solution is decentralized photo.
Described spray column segment structure, cleaning solution is sprayed by nozzle, washing section velocity of flue gas 3.0-4.0m/s, liquid-gas ratio 0.8-1.2L/m
3, time of contact 0.5-0.8s, burner design is spiral nozzle.
The filler of described packing tower section is selected grid packing or structured packing, processes while carrying the calcium sulfate flue gas secretly, selects grid packing; While selecting the double alkali method desulfurizing method, use the Mellapak105Y structured packing, in the stuffing washing tower section, flue gas is continuous phase, and washings are decentralized photo.
Described macroporous plate tower section, flue gas is at a high speed by sieve aperture, and flue gas is continuous phase, and the liquid on sieve plate is dispersed into drop by high-speed gas, liquid is decentralized photo.
Described macroporous plate tower segment structure, aperture φ 15-20mm, percent opening 20-25%, liquid-gas ratio 0.4-0.6L/m
3.
The described riser plate endotracheal velocity of flue gas 10-10m/s that rises.
The present invention arranges washing section in absorption tower, has reduced in flue gas desulfurization products such as carrying gypsum secretly, and the discharge capacity of fine particle (PM2.5), purified air.
The accompanying drawing explanation
Fig. 1 is the absorption tower structural representation.
The specific embodiment
As shown in Figure 1, effectively control the technique of PM2.5 discharge, comprise the following steps: flue gas is entered the absorber portion 3 on absorption tower by import 2, with the limestone slurry absorption liquid counter current contacting of spray, the S0 in flue gas
2be absorbed, then flue gas enters washing section 4 by the riser on riser plate 7 by absorber portion 3, and flue gas is washed water washing in the washing section that is provided with many row's Washing spray nozzles, then enters to chimney through demister 5, flue gas discharge opening 10.Riser plate 7 is separated absorber portion 3 and washing section 4, the endotracheal velocity of flue gas 10-10m/s of riser plate 7 rising.Flue gas enters washing section 4 by the riser on riser plate 7 by absorber portion 3, and each self-loopa of absorption liquid and cleaning solution, absorption liquid is delivered to nozzle 8 sprays by storage tank 1 through circulating pump P101, with flue gas adverse current, contact, and cleaning solution is delivered to nozzle 6 by washing liquid bath 9 through detergent circulator P102, contact with flue gas adverse current, and make the absorption liquid of carrying secretly in flue gas wash, then cleaning solution is collected on riser plate 7, then flows in washing liquid bath V101.Washings are fresh water (FW), first in washing liquid bath 9, are filled with fresh water (FW), with washing liquid pump P102, deliver to washing section 4 washings; The liquid level of storage tank 1 on absorption tower of being in operation is controlled a part of cleaning solution W
2be supplemented to absorption tower, the same liquid level according to storage tank 1 is by W
1import department supplements fresh water (FW).
In washing section, be divided into: spray column section, packing tower section and macroporous plate tower section form, its rising flue gas of spray column section contacts and washs with spray washing liquid, cleaning solution is washed by the nozzle ejection after washing liquid pump by the washing liquid bath, and flue gas is continuous phase, and cleaning solution is decentralized photo.The spray column segment structure, cleaning solution is sprayed by nozzle, washing section velocity of flue gas 3.0-4.0m/s, liquid-gas ratio 0.8-1.2L/m
3, time of contact 0.5-0.8s, burner design is spiral nozzle.The filler of packing tower section is selected grid packing or structured packing, processes while carrying the calcium sulfate flue gas secretly, selects grid packing; While selecting the double alkali method desulfurizing method, use the Mellapak105Y structured packing, in the stuffing washing tower section, flue gas is continuous phase, and washings are decentralized photo.Macroporous plate tower section, flue gas is at a high speed by sieve aperture, and flue gas is continuous phase, and the liquid on sieve plate is dispersed into drop by high-speed gas, liquid is decentralized photo.Macroporous plate tower segment structure, aperture φ 15-20mm, percent opening 20-25%, liquid-gas ratio 0.4-0.6L/m
3.
Be the absorption tower structural representation as shown in Figure 1, after flue gas enters absorption tower by import 2, at absorber portion 3, the absorption liquid of flue gas and spray (lime stone slurry) counter current contacting, the S0 in flue gas
2be absorbed, then flue gas enters washing section 4 by the riser on riser plate 7 by absorber portion 3 and is washed water washing, then, through demister 5, then through flue gas discharge opening 10, enters to chimney.
Washing used is fresh water (FW), first in washing liquid bath 9, is filled with fresh water (FW), delivers to washing section 4 with washing liquid pump P102 and washs.The liquid level of absorption tower storage tank 1 of being in operation is controlled a part of cleaning solution W
2be supplemented to absorption tower, the same liquid level according to storage tank 1 is by W
1import department supplements fresh water (FW).
Claims (9)
1. effectively control the technique of PM2.5 discharge, comprise the following steps: it is characterized in that: flue gas is entered the absorber portion on absorption tower by import, with the limestone slurry absorption liquid counter current contacting of spray, the SO in flue gas
2be absorbed, then flue gas enters washing section by the riser on the riser plate by absorber portion, and flue gas is washed water washing in the washing section that is provided with many row's Washing spray nozzles, then enters to chimney through demister, flue gas discharge opening.
2. the technique that effective control PM2.5 according to claim 1 discharges, it is characterized in that: described riser plate is separated absorber portion and washing section, flue gas enters washing section by the riser on the riser plate by absorber portion, and each self-loopa of absorption liquid and cleaning solution, absorption liquid is delivered to the nozzle spray by storage tank through circulating pump, with flue gas adverse current, contact, and cleaning solution is delivered to nozzle by the washing liquid bath through detergent circulator, with flue gas adverse current, contact, and make the absorption liquid of carrying secretly in flue gas wash, then cleaning solution is collected on the riser plate, then flow in the washing liquid bath.
3. the technique that effective control PM2.5 according to claim 1 discharges, it is characterized in that: described washings are fresh water (FW), first in the washing liquid bath, are filled with fresh water (FW), with cleaning solution, are pumped to the washing section washing; The liquid level of storage tank on absorption tower of being in operation is controlled a part of cleaning solution W
2be supplemented to absorption tower, the same liquid level according to storage tank is by W
1import department supplements fresh water (FW).
4. the technique that effective control PM2.5 according to claim 1 discharges, it is characterized in that: described washing section is divided into: spray column section, packing tower section and macroporous plate tower section form, its rising flue gas of spray column section contacts and washs with spray washing liquid, cleaning solution is washed by the nozzle ejection after washing liquid pump by the washing liquid bath, flue gas is continuous phase, and cleaning solution is decentralized photo.
5. the technique that effective control PM2.5 according to claim 3 discharges, it is characterized in that: described spray column segment structure, cleaning solution is sprayed by nozzle, washing section velocity of flue gas 3.0-4.0m/s, liquid-gas ratio 0.8-1.2L/m
3, time of contact 0.5-0.8s, burner design is spiral nozzle.
6. the technique that effective control PM2.5 according to claim 3 discharges, it is characterized in that: the filler of described packing tower section is selected grid packing or structured packing, processes while carrying the calcium sulfate flue gas secretly, selects grid packing; While selecting the double alkali method desulfurizing method, use the Mellapak105Y structured packing, in the stuffing washing tower section, flue gas is continuous phase, and washings are decentralized photo.
7. the technique that effective control PM2.5 according to claim 3 discharges is characterized in that: described macroporous plate tower section, and flue gas is at a high speed by sieve aperture, and flue gas is continuous phase, and the liquid on sieve plate is dispersed into drop by high-speed gas, liquid is decentralized photo.
8. the technique of effective control PM2.5 according to claim 3 discharge, is characterized in that: described macroporous plate tower section, aperture φ 15-20mm, percent opening 20-25%, liquid-gas ratio 0.4-0.6L/m
3.
9. the technique of effective control PM2.5 discharge according to claim 1 is characterized in that: the described riser plate endotracheal velocity of flue gas that rises is 10-10m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013103469596A CN103432892A (en) | 2013-08-08 | 2013-08-08 | Technology for effectively controlling PM2.5 discharge |
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| CN2013103469596A CN103432892A (en) | 2013-08-08 | 2013-08-08 | Technology for effectively controlling PM2.5 discharge |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106433803A (en) * | 2016-08-11 | 2017-02-22 | 义马煤业综能新能源有限责任公司 | Water-washing dedusting device for exhaust discharged from u-gas gasifier during start-stop period and dedusting process of water-washing dedusting device |
| CN109668463A (en) * | 2018-12-26 | 2019-04-23 | 青岛双瑞海洋环境工程股份有限公司 | Marine exhaust washing system and steamer |
| CN111617604A (en) * | 2020-06-05 | 2020-09-04 | 碧水蓝天环境工程有限公司 | Energy-saving and environment-friendly limestone-gypsum wet flue gas desulfurization tower |
-
2013
- 2013-08-08 CN CN2013103469596A patent/CN103432892A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106433803A (en) * | 2016-08-11 | 2017-02-22 | 义马煤业综能新能源有限责任公司 | Water-washing dedusting device for exhaust discharged from u-gas gasifier during start-stop period and dedusting process of water-washing dedusting device |
| CN109668463A (en) * | 2018-12-26 | 2019-04-23 | 青岛双瑞海洋环境工程股份有限公司 | Marine exhaust washing system and steamer |
| CN111617604A (en) * | 2020-06-05 | 2020-09-04 | 碧水蓝天环境工程有限公司 | Energy-saving and environment-friendly limestone-gypsum wet flue gas desulfurization tower |
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Application publication date: 20131211 |