CN103566732A - Alkaline-method wet-type desulfurization denitration technology and device - Google Patents
Alkaline-method wet-type desulfurization denitration technology and device Download PDFInfo
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- CN103566732A CN103566732A CN201210268987.6A CN201210268987A CN103566732A CN 103566732 A CN103566732 A CN 103566732A CN 201210268987 A CN201210268987 A CN 201210268987A CN 103566732 A CN103566732 A CN 103566732A
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Abstract
The invention provides an alkaline-method wet-type desulfurization denitration technology and a device, and relates to the atmospheric pollution control field. The device comprises a desulfurization denitration tower, the desulfurization denitration tower is respectively communicated with an induced draft fan and a chimney, and then communicated with a slurry pool, the bottom of the desulfurization denitration tower is communicated with a circulating pool and an oxidation agent pool, the circulating pool is communicated with the desulfurization denitration tower through a crystallization pump, a desulfurization circulating pump and a denitration circulating pump, the circulating pool is also respectively communicated with an oxidation air blower, a sodium hydroxide pool and the slurry pool, the oxidation agent pool is communicated with the desulfurization denitration tower through an oxidation agent pump, the device also comprises a cyclone, the upper part of the cyclone is communicated with the circulating pool through the crystallization pump, and the lower part of the cyclone is respectively communicated with a liquid storage tank and a vacuum belt dewatering machine. According to the alkaline-method wet-type desulfurization denitration technology and the device, desulfurization and denitration technologies are effectively combined together, and desulfurization denitrification equipment is integrated as a whole, so that flue gas desulfurization and flue gas denitrification both can be achieved, re investing on a denitration technology can be avoided, the occupied area is saved, and the cost of operation is reduced.
Description
Technical field
The present invention relates to prevention and control of air pollution field, relate in particular to a kind of alkaline process wet type desulfurizing denitrating technique and device.
Background technology
Environment is the problem that is related to sustainable economic development, and the nature that to protect mankind is depended on for existence and ecological environment have caused the extensive concern of various countries.China is a coal-fired big country, and the sulfur dioxide discharging in coal-fired process is one of Air Pollutant Discharge, and it has a strong impact on environment, threatens people's health, so subdue the discharge capacity of sulfur dioxide, is that China improves one of primary goal of environment.In addition, nitrogen oxide has also become a kind of main pollutant that China faces.Sulfur dioxide and nitrogen oxide are the one of the main reasons that forms acid rain and acid mist, and nitrogen oxide and nitrogen hydride, in conjunction with forming photochemical fog, not only damage natural environment, and health is also had to certain injury.Yet the denitrating flue gas work of China is started late, technology is more immature, and current used denitrating technique and equipment are independent running, cannot effectively be combined with sulfur removal technology and equipment, make like this denitration must prepare new independently equipment, take a large amount of areas, cause the significantly raising of entreprise cost.
Summary of the invention
The object of this invention is to provide and a kind ofly can carry out desulphurization denitration work, floor space is little, operating cost is low and desulphurization denitration rate is high alkaline process wet type desulfurizing denitrating technique and device simultaneously.
In order to achieve the above object, the present invention adopts following technical scheme:
1) adopt calcium oxide as desulfurizing agent, flue gas is carried out to desulfurization, make sulfur dioxide and calcium hydroxide generation chemical reaction in flue gas, generate calcium sulfate and calcium sulfite;
2) adopt oxidant to carry out oxidation processes to the flue gas through desulfurization, make nitric oxide and oxidant reaction in flue gas generate nitrogen dioxide;
3) adopt NaOH as denitrfying agent, the flue gas through oxidant oxidation is carried out to denitration, make nitrogen dioxide in flue gas react with NaOH, generation sodium nitrate and natrium nitrosum;
4) flue gas through desulphurization denitration is dewatered and foam removal demist is processed, the clean flue gas that acquisition can be discharged;
5) adopt air as oxidant, the calcium sulfite producing in step 1) and step 3) and natrium nitrosum are carried out to oxidation processes, generate calcium sulfate and sodium nitrate;
6) to step 3) and 5) in the sodium nitrate solution that generates carry out evaporative crystallization, separate out sodium nitrate crystal grain.
Further, after step 6), also comprise:
7) respectively to step 1) and 5) in obtain sodium nitrate crystal grain suspension in the calcium sulfate that obtains and step 6) and carry out Separation of Solid and Liquid;
8) calcium sulfate after step 7) Separation of Solid and Liquid and sodium nitrate are dewatered, obtain accessory substance;
The present invention also provides a kind of alkaline process wet type desulfurizing denitrification apparatus, comprise desulphurization denitration tower, it is communicated with the chimney of discharge clean flue gas with the air-introduced machine of introducing former flue gas respectively, and be communicated with slurry pool by slush pump, described desulphurization denitration tower bottom is communicated with circulatory pool, oxidant pond, described circulatory pool is by crystallization pump, desulfuration recycle pump and denitration circulating pump are communicated with described desulphurization denitration tower, described circulatory pool also respectively with oxidation fan, NaOH pond and described slurry pool are communicated with, described oxidant pond is communicated with described desulphurization denitration tower by oxidant pump, also comprise cyclone, this cyclone top is communicated with described circulatory pool by described crystallization pump, bottom is communicated with liquid storage tank and vacuum belt dewaterer respectively, described vacuum belt dewaterer is also communicated with described liquid storage tank.
Further, described liquid storage tank is also communicated with described circulatory pool by technique water pump.
Further, described desulphurization denitration tower comprises crystallized region, desulfurization section, flue gas oxidation panel, smoke absorption section and fume-dehydrating section, described crystallized region is communicated with described circulatory pool by crystallization pump, described desulfurization section is communicated with described slurry pool by slush pump, described smoke absorption section is communicated with described circulatory pool by described denitration circulating pump, and described flue gas oxidation panel is communicated with described oxidant pond by oxidant pump.
Further, described chimney place is provided with on-line monitoring device.
Further, described slurry pool top is provided with desulfurizing agent warehouse, and this desulfurizing agent warehouse bottom is provided with dosing valve.
Further, described slurry pool is provided with mixing pump.
Further, described desulfuration recycle pump, denitration circulating pump, crystallization pump, oxidation fan, slush pump, oxidant pump, dosing valve, mixing pump, at thread detector, technique water pump, vacuum belt dewaterer, be all communicated with electric control system.
Advantage of the present invention and beneficial effect:
A kind of alkaline process wet type desulfurizing denitrating technique provided by the invention and device, effectively desulfurization and denitrating technique are combined, and desulphurization denitration integration of equipments is integrated, flue gas desulfurization can be realized and denitrating flue gas can be carried out again, avoided the investment again to denitrating technique, save floor space, reduced operating cost.
Accompanying drawing explanation
Fig. 1 a kind of alkaline process wet type desulfurizing denitrification apparatus structural representation provided by the invention.
The specific embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
A wet type desulfurizing denitrating technique, comprises the following steps:
1) adopt calcium oxide as desulfurizing agent, flue gas is carried out to desulfurization, make sulfur dioxide and calcium hydroxide generation chemical reaction in flue gas, generate calcium sulfate and calcium sulfite;
2) adopt oxidant to carry out oxidation processes to the flue gas through desulfurization, make nitric oxide and oxidant reaction in flue gas generate nitrogen dioxide;
3) adopt NaOH as denitrfying agent, the flue gas through oxidant oxidation is carried out to denitration, make nitrogen dioxide in flue gas react with NaOH, generation sodium nitrate and natrium nitrosum;
4) flue gas through desulphurization denitration is dewatered and foam removal demist is processed, the clean flue gas that acquisition can be discharged;
5) adopt air as oxidant, the calcium sulfite producing in step 1) and step 3) and natrium nitrosum are carried out to oxidation processes, generate calcium sulfate and sodium nitrate;
6) to step 3) and 5) in the sodium nitrate solution that generates carry out evaporative crystallization, separate out sodium nitrate crystal grain.
Further, after step 6), also comprise:
7) respectively to step 1) and 5) in obtain sodium nitrate crystal grain suspension in the calcium sulfate that obtains and step 6) and carry out Separation of Solid and Liquid;
8) calcium sulfate after step 7) Separation of Solid and Liquid and sodium nitrate are dewatered, obtain accessory substance;
The present invention also provides a kind of alkaline process wet type desulfurizing denitrification apparatus, as shown in Figure 1, comprise desulphurization denitration tower 2, it is communicated with the chimney 5 of discharge clean flue gas with the air-introduced machine 1 of introducing former flue gas respectively, and be communicated with slurry pool 11 by slush pump 12, described desulphurization denitration tower 2 bottoms are communicated with circulatory pool 3, oxidant pond 4, described circulatory pool 3 is by crystallization pump 15, desulfuration recycle pump 14 and denitration circulating pump 18 are communicated with described desulphurization denitration tower 2, described circulatory pool 3 also respectively with oxidation fan 16, NaOH pond 9 and described slurry pool 11 are communicated with, described oxidant pond 4 is communicated with described desulphurization denitration tower 2 by oxidant pump 13, also comprise cyclone 6, these cyclone 6 tops are communicated with described circulatory pool 3 by described crystallization pump 15, bottom is communicated with liquid storage tank 7 and vacuum belt dewaterer 8 respectively, described vacuum belt dewaterer 8 is also communicated with described liquid storage tank 7.
Further, described liquid storage tank 7 is also communicated with described circulatory pool 3 by technique water pump 17.
Further, described desulphurization denitration tower 2 comprises crystallized region 21, desulfurization section 22, flue gas oxidation panel 23, smoke absorption section 24 and fume-dehydrating section 25, described crystallized region 21 is communicated with described circulatory pool 3 by crystallization pump 15, described desulfurization section 22 is communicated with described slurry pool 11, described smoke absorption section 24 is communicated with described circulatory pool 3 by described denitration circulating pump 18, and described flue gas oxidation panel 23 is communicated with described oxidant pond 4 by oxidant pump 13.
Further, described chimney 5 places are provided with on-line monitoring device 19.
Further, described slurry pool 11 tops are provided with desulfurizing agent warehouse 10, and these desulfurizing agent warehouse 10 bottoms are provided with dosing valve 27.
Further, described slurry pool is provided with mixing pump 26.
Further, described desulfuration recycle pump 14, denitration circulating pump 18, crystallization pump 15, oxidation fan 16, slush pump 12, oxidant pump 13, dosing valve 27, mixing pump 26, at thread detector 19, technique water pump 17, vacuum belt dewaterer 8, be all communicated with electric control system 20.
Alkaline process wet type desulfurizing denitrating technique provided by the invention and the device course of work: flue gas is introduced desulphurization denitration tower 2 by air-introduced machine 1, this flue gas contacts purification by the atomising device (not shown) with in desulfurization section 22, flue gas oxidation panel 23, smoke absorption section 24 in desulphurization denitration tower 2, swirl-flow devices (not shown) and bubbling device (not shown) successively, then after fume-dehydrating section 25 and demister (not shown) demist, by flue gas on-line monitoring 19 through chimney 5 qualified discharges.
Desulfurizing and denitrifying process provided by the invention and device employing calcium oxide are as desulfurizing agent, NaOH as denitrfying agent, and desulfurizing agent is sent into slurry pool 11 by dosing valve 27 from desulfurizing agent warehouse 10, and makes desulfurizer slurry under the stirring of agitator 26.The upper end of the desulfurization section 22 in desulphurization denitration tower 2 is communicated with slurry pool 11 by slush pump 12, slurries are from the top of desulfurization section 22 spray, fully absorb the sulfide in flue gas, and the last circulatory pool 7 that is arranged on desulphurization denitration tower 2 bottoms that flows into, and by desulfuration recycle pump 14 circulation desulfurizations.The upper end of smoke absorption section 24 is communicated with circulatory pool 3 by denitration circulating pump 18, NaOH pond 9 is to circulatory pool 3 supplemental hydrogen sodium oxide molybdena denitrfying agents, and sprayed by the top that denitration circulating pump 18 pumps into smoke absorption section 24, fully absorb the nitride in flue gas, and the last circulatory pool 3 that is arranged on desulphurization denitration tower 2 bottoms that flows into.At flue gas, carry out, after desulfurization processing, first can entering flue gas oxidation panel 23, by oxidant, the oxidation of nitric oxide in flue gas is become to nitrogen dioxide, the nitrogen dioxide then entering in 24 pairs of flue gases of smoke absorption section absorbs.Oxidant enters flue gas oxidation panel 23 by oxidant pump 13 by the oxidant pond 4 that is arranged on desulphurization denitration tower 2 bottoms, flows back to oxidation pond 4 again, thereby realize making full use of of oxidant through being oxidized remaining oxidant.
The circulatory pool 3 that is arranged on desulphurization denitration tower 2 bottoms is communicated with desulfurization section 22 by desulfuration recycle pump 14, and calcium hydroxide can be recycled, and when calcium hydroxide composition changes to a certain degree, profit is supplemented slurries by slurry pool 11, to guarantee absorption efficiency.
For fear of desulphurization denitration wet flue gas drop to around device corrosion, flue gas after purification enters fume-dehydrating section 25, gas-liquid separation under Action of Gravity Field, then pass through high-efficiency foam remover and fresh water (FW) flusher, mist trapping in flue gas is reclaimed, flow in the lump circulatory pool 7 with parting liquid.Simultaneously, for fear of the interior solid matter deposition of circulatory pool 3, in circulatory pool 3, be provided with agitating device, and be provided with access path between circulatory pool 3 bottoms and tower body bottom, when equipment operation, can the sewage draining exit at the bottom of agitating device (not shown) and tower be safeguarded and be overhauled.
When the calcium sulfite in circulatory pool 3 and natrium nitrosum concentration acquire a certain degree, by oxidation fan 16, pass into compressed air, calcium sulfite and natrium nitrosum are oxidized to calcium sulfate and sodium nitrate, qualified calcium sulfate is sent in cyclone 6 by desulfuration recycle pump 14, sodium nitrate solution is sent in the crystallized region 21 in desulphurization denitration tower 2 by crystallization pump 15 from circulatory pool 3 continuously, by hot flue gas, carry out circulating and evaporating, sodium nitrate concentrates because moisture evaporates, concentration improves gradually, after reaching capacity, finally separate out sodium nitrate crystal grain, when crystalline content acquires a certain degree, send into cyclone 6.In this cyclone 6, in calcium sulfate and sodium nitrate crystal grain suspension, crystal grain sinks, in bottom, assemble, supernatant flows into liquid storage tank 7, the crystal grain of cyclone 6 bottoms enters vacuum belt dewaterer 8 and carries out Separation of Solid and Liquid, isolated calcium sulfate and sodium nitrate crystallization enter byproduct for treatment operation, and parting liquid flows into liquid storage tank 7.
Above desulphurization denitration process all adopts electric control method to control, wherein desulfuration recycle pump 14, denitration circulating pump 18, crystallization pump 15, oxidation fan 16, slush pump 12, oxidant pump 13, dosing valve 27, mixing pump 26, at thread detector 20, technique water pump 17, vacuum belt dewaterer 8, be all communicated with electric control system 20.
The foregoing is only preferred embodiment of the present invention, be not used for limiting practical range of the present invention; If do not depart from the spirit and scope of the present invention, the present invention is modified or is equal to replacement, all should be encompassed in the middle of the protection domain of the claims in the present invention.
Claims (9)
1. an alkaline process wet type desulfurizing denitrating technique, is characterized in that, comprises the following steps:
1) adopt calcium oxide as desulfurizing agent, flue gas is carried out to desulfurization, make sulfur dioxide and calcium hydroxide generation chemical reaction in flue gas, generate calcium sulfate and calcium sulfite;
2) adopt oxidant to carry out oxidation processes to the flue gas through desulfurization, make nitric oxide and oxidant reaction in flue gas generate nitrogen dioxide;
3) adopt NaOH as denitrfying agent, the flue gas through oxidant oxidation is carried out to denitration, the nitrogen dioxide in flue gas is reacted with NaOH, generate sodium nitrate and natrium nitrosum;
4) flue gas through desulphurization denitration is dewatered and foam removal demist is processed, the clean flue gas that acquisition can be discharged;
5) adopt air as oxidant, the calcium sulfite producing in step 1) and step 3) and natrium nitrosum are carried out to oxidation processes, generate calcium sulfate and sodium nitrate;
6) to step 3) and 5) in the sodium nitrate solution that generates carry out evaporative crystallization, separate out sodium nitrate crystal grain.
2. desulfurizing and denitrifying process according to claim 1, is characterized in that, after step 6), also comprises:
7) respectively to step 1) and 5) in obtain sodium nitrate crystal grain suspension in the calcium sulfate that obtains and step 6) and carry out Separation of Solid and Liquid;
8) calcium sulfate after step 7) Separation of Solid and Liquid and sodium nitrate are dewatered, obtain accessory substance.
3. an alkaline process wet type desulfurizing denitrification apparatus, it is characterized in that, comprise desulphurization denitration tower, it is communicated with the chimney of discharge clean flue gas with the air-introduced machine of introducing former flue gas respectively, and be communicated with slurry pool by slush pump, described desulphurization denitration tower bottom is communicated with circulatory pool, oxidant pond, described circulatory pool is by crystallization pump, desulfuration recycle pump and denitration circulating pump are communicated with described desulphurization denitration tower, described circulatory pool also respectively with oxidation fan, NaOH pond and described slurry pool are communicated with, described oxidant pond is communicated with described desulphurization denitration tower by oxidant pump, also comprise cyclone, this cyclone top is communicated with described circulatory pool by described crystallization pump, bottom is communicated with liquid storage tank and vacuum belt dewaterer respectively, described vacuum belt dewaterer is also communicated with described liquid storage tank.
4. alkaline process wet type desulfurizing denitrification apparatus according to claim 3, is characterized in that, described liquid storage tank is also communicated with described circulatory pool by technique water pump.
5. alkaline process wet type desulfurizing denitrification apparatus according to claim 4, it is characterized in that, described desulphurization denitration tower comprises crystallized region, desulfurization section, flue gas oxidation panel, smoke absorption section and fume-dehydrating section, described crystallized region is communicated with described circulatory pool by crystallization pump, described desulfurization section is communicated with described slurry pool by slush pump, described smoke absorption section is communicated with described circulatory pool by described denitration circulating pump, and described flue gas oxidation panel is communicated with described oxidant pond by oxidant pump.
6. alkaline process wet type desulfurizing denitrification apparatus according to claim 5, is characterized in that, described chimney place is provided with on-line monitoring device.
7. alkaline process wet type desulfurizing denitrification apparatus according to claim 6, is characterized in that, described slurry pool top is provided with desulfurizing agent warehouse, and this desulfurizing agent warehouse bottom is provided with dosing valve.
8. alkaline process wet type desulfurizing denitrification apparatus according to claim 7, is characterized in that, described slurry pool is provided with mixing pump.
9. alkaline process wet type desulfurizing denitrification apparatus according to claim 8, it is characterized in that, described desulfuration recycle pump, denitration circulating pump, crystallization pump, oxidation fan, slush pump, oxidant pump, dosing valve, mixing pump, at thread detector, technique water pump, vacuum belt dewaterer, be all communicated with electric control system.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104607029A (en) * | 2015-01-23 | 2015-05-13 | 大连理工大学 | Synchronous flue gas desulfurization and denitrification process combining chemical absorption with anaerobic-aerobic conversion |
| CN108686420A (en) * | 2018-07-11 | 2018-10-23 | 绵阳惠泽天下环保科技有限公司 | Convenient for the system of oxidation and denitration mother liquor filtering |
| CN110127641A (en) * | 2018-02-02 | 2019-08-16 | 中国科学院过程工程研究所 | A method of recycling nitrite from desulphurization denitration waste liquid |
| CN112316505A (en) * | 2020-10-30 | 2021-02-05 | 刘美琴 | Secondary purification and filtration device of desulfurization and denitrification tower |
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Cited By (4)
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| CN110127641A (en) * | 2018-02-02 | 2019-08-16 | 中国科学院过程工程研究所 | A method of recycling nitrite from desulphurization denitration waste liquid |
| CN108686420A (en) * | 2018-07-11 | 2018-10-23 | 绵阳惠泽天下环保科技有限公司 | Convenient for the system of oxidation and denitration mother liquor filtering |
| CN112316505A (en) * | 2020-10-30 | 2021-02-05 | 刘美琴 | Secondary purification and filtration device of desulfurization and denitrification tower |
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Application publication date: 20140212 |