CN101804293A - Flue gas desulfurization method of heating boiler and device thereof - Google Patents
Flue gas desulfurization method of heating boiler and device thereof Download PDFInfo
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Abstract
The invention relates to a flue gas desulfurization method of a heating boiler and a device thereof, belonging to the technical field of heating boilers. The flue gas desulfurization method of the heating boiler comprises the following steps of: precooling, desulfurizing, magnesium oxide pulping, absorption liquid aeration and crystallizing dehydration. In the precooling step, glue gas enters a precooling tower through a flue gas inlet channel for precooling, and absorption liquid is atomized and sprayed; in the desulfurizing step, the flue gas enters a desulfurizing tower for desulfurizing, and the absorption liquid is atomized and sprayed; the flue gas is discharged through a chimney; in the step of magnesium oxide pulping, magnesium oxide powder is pulped in a digestion tank; in the step of absorption liquid aeration, an air blower carries out aeration on the absorption liquid by a gas distribution pipe; and in the step of crystallizing dehydration, magnesium sulfate crystal size is crystallized and dehydrated. The flue gas desulfurization device of the heating boiler is characterized in that the flue gas inlet channel is communicated with the precooling tower by a draught fan; the precooling tower is communicated with the desulfurizing tower through a flue; the desulfurizing tower is communicated with the chimney; an absorption liquid atomization spray mechanism is respectively arranged in the precooling tower and the desulfurizing tower; the air blower is communicated with an aeration gas distribution pipe; a circulating water pool is communicated with a dehydrator; and a spray circulating pump is communicated with the digestion tank. The invention has the advantages of good desulfurizing effect, high desulfurizing efficiency, little water along with flue gas discharge, convenient operation, environmental protection and the like.
Description
Technical field
The invention belongs to the heating boiler technical field, particularly relate to a kind of flue gas desulfurization method of heating boiler and device thereof.
Background technology
At present, industrial heating boiler flue gas desulfurization, particularly wet desulfurizing process, there is following shortcoming in it in the middle of concrete the application:
1, mostly be dust-removing and desulfurizing integrated device greatly, and mostly be moisture film or water bath desulfurization dust removing, desulfurized effect is poor, and dedusting ash and desulphurization circulating liquid mixes, and has both caused the decline of desulfuration efficiency, is unfavorable for the processing of accessory substance again.
2, existing desulfurization atomizer adopts the shower nozzle form, and it easily stops up, and can't guarantee the normal operation of atomising device.
3, discharging flue gas with water problem is serious.The conventional dehydration demister adopts the steel wire lump web frame mostly, and it is easily stopped up by flue dust, causes that resistance is big, dehydration is not thorough, corrodes follow-up flue, acid mist pollution external environment condition easily.
4, no oxygenating and aerating unit causes the desulfurization product instability, causes secondary pollution easily.In the tradition sulfur removal technology, finally forming product is SO
3 2-Compound all is easy to separate out SO under the environment of scraping, drench with rain, be exposed to the sun at wind
2Or formation H
2SO
3, reenter air or flow into following water trench and cause secondary pollution.
5, desulphurization system pipeline, wall fouling are serious, cause pipeline blockage easily.
6, existing desulfurizing agent (pharmacy) part of adding, the simple and easy pharmacy modes such as manually directly toppling over mode that adopt not only cause on-the-spot dust pollution more, and labor strength is big, and the non-constant of effects on slurry making, precipitates waste resource etc. easily.
Summary of the invention
The present invention provides a kind of flue gas desulfurization method of heating boiler and device thereof for solving the technical problem that exists in the known technology.
One of purpose of the present invention provides that a kind of to have a desulfurized effect good, desulfuration efficiency height, the flue gas desulfurization method of heating boiler of characteristics such as fume emission band water is few, and technology is simple, and is easy to operate, economical and practical, reduces secondary pollution, and environmental protection is good.
The technical scheme that flue gas desulfurization method of heating boiler of the present invention adopted is:
A kind of flue gas desulfurization method of heating boiler is characterized in: flue gas desulfurization technique comprises,
Precooling: the flue gas after dust removal process is sent into the precooling tower by flue by air-introduced machine and is carried out precooling; Absorption liquid through circulating pump to precooling tower atomized spray;
Desulfurization: pre-cold flue gas enters the desulfurizing tower desulfurization; Absorption liquid through circulating pump to the desulfurizing tower atomized spray; Flue gas after the desulfurization is through smoke stack emission;
Magnesia slurrying: magnesium oxide powder is slurrying in digester, and slurries are delivered to circulating pump by slush pump, carries out flue gas precooling tower and desulfurizing tower atomized spray;
The absorption liquid aeration: air blast is by gas distribution pipe, the absorption liquid aeration in circulating water pool;
Exsiccation: the magnesium sulfate crystalline solid slurries behind the absorption liquid aeration, send into dewaterer through slurry pump and carry out exsiccation, deviate from water and flow into circulating water pool.
Flue gas desulfurization method of heating boiler of the present invention can also be taked following technical scheme:
Described flue gas desulfurization method of heating boiler is characterized in: carry out flue gas demist operation after the desulfurization, the flue gas of band water smoke removes water smoke through demister and handles.
Described flue gas desulfurization method of heating boiler is characterized in: flue gas carries out the pre-cold water spray of following current at the precooling tower, carries out countercurrent spray at desulfurizing tower.
Described flue gas desulfurization method of heating boiler is characterized in: the magnesia pulping process is that magnesium oxide powder is admitted in the digester through barrel on cast feeder, the vacuum, adds fresh water (FW) and carries out, and carries out slurrying through stirring; Digester is sent into slurries in the slurries pond by delivery pump, and the slurries pond is delivered to the circulating pump water sucking mouth by slush pump with absorption liquid.
The heating boiler flue gas desulfur device of characteristics such as two of purpose of the present invention provides that a kind of to have a desulfurized effect good, and the desulfuration efficiency height is simple in structure, easy to operate, economical and practical, reduces secondary pollution, and environmental protection is good.
The technical scheme that heating boiler flue gas desulfur device of the present invention is adopted is:
A kind of heating boiler flue gas desulfur device is characterized in: the flue gas flue after dust removal process is communicated with the precooling tower by air-introduced machine, and the precooling tower is communicated with desulfurizing tower through flue, and desulfurizing tower is communicated with the chimney of fume emission; Absorption liquid atomized spray mechanism is arranged in precooling tower and the desulfurizing tower; The absorption liquid circulating water pool is communicated with precooling tower and desulfurizing tower atomized spray circulating pump; Aeration gas distribution pipe in the air blast communication loop pond is arranged; Circulating water pool has slurry pump to be communicated with magnesium sulfate crystalline solid dewaterer, and dewaterer has water to flow into the path of circulating water pool; The spraying cycle pump is communicated with the digester of magnesium oxide powder slurrying.
Heating boiler flue gas desulfur device of the present invention can also be taked following technical scheme:
Described heating boiler flue gas desulfur device is characterized in: desulfurizing tower top is provided with demister, and demister is communicated with water pump.
Described heating boiler flue gas desulfur device is characterized in: the precooling tower has housing, and housing is provided with into mouth, outlet flue and delivery port, and the pipeline that links to each other with housing is installed in the import department of precooling tower (2), and nozzle is connected with pipeline; Desulfurizing tower has housing, is respectively arranged with into mouth, outlet flue and delivery port on the housing, and demister is connected with housing, the pipeline that is connected with housing is installed in the bottom of demister, nozzle is connected with pipeline, and the pipeline that is connected with housing is installed in the top of demister, and nozzle is connected with pipeline.
Described heating boiler flue gas desulfur device, be characterized in: be connected with the magnesium oxide powder cast feeder on the digester of magnesium oxide powder slurrying, the magnesium oxide powder cast feeder has hopper, hopper has magnesium oxide powder negative-pressure air-flow induction system to be communicated with barrel on the vacuum, the barrel bottom is provided with flashboard on the vacuum, and flashboard is communicated with digester.
Described heating boiler flue gas desulfur device is characterized in: the cast feeder top is provided with dedusting fan, and the dedusting fan bottom is a filter; The barrel top is provided with back-blowing device on the vacuum, and the back-blowing device bottom is a filter; Barrel on vacuum blower and the vacuum, barrel is connected with the cast feeder pipeline on the vacuum; The air compressor pipeline provides compressed air.
Described heating boiler flue gas desulfur device is characterized in: have agitator to stir in the digester; Be communicated with the slurries pond through pump, slurries have agitator in the pond.
Advantage and good effect that the present invention has are:
Flue gas desulfurization method of heating boiler and device thereof are owing to adopted brand-new technology scheme of the present invention, thereby have following characteristics: desulfurization and dedusting are separated, flue gas after the dedusting enters desulphurization system again, and adopting the mode of following current precooling tower and the combination of adverse current desulfurizing tower to carry out the desulfurization processing, desulfurized effect is good; Because of adopting the large-caliber spiral nozzle, it is difficult for stopping up, and can guarantee spray effect; Because of adopting the folded plate type demister, it can be crossed fully the water smoke composition in the flue gas is removed, so avoided the follow-up pipeline of corrosion, acid mist pollution external environment condition; Because of the absorption liquid in the circulating water pool is carried out oxygenic aeration, make desulfurization product stable especially, it can not cause secondary pollution to environment under any condition; Because of the employing air-transport system, on-the-spot no dust pollution, effects on slurry making is good.
Description of drawings
Fig. 1 is a process structure schematic diagram of the present invention.
Among the figure, 1. desulfurizing tower, 2. precooling tower, 3. circulating pump, 4. circulating water pool, 5. air blast, 6. gas distribution pipe, 7. slurry pump, 8. dewaterer, 9. slurries pond, 10. agitator, 11. slush pumps, 12. flues, 13. blower fans, 14. valves, 15. chimney, 16. water tanks, 17. water pumps, 18. delivery pumps, 19. digesters, 20. agitator, 21. stations that feed intake, 22. air compressors, barrel on 23. vacuum, 24. vacuum blower, 25. trenches, 26. valves, 27. valves.
The specific embodiment
For further understanding technology contents of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
Consult accompanying drawing 1.
A kind of flue gas desulfurization method of heating boiler comprises following technical process:
Precooling: the flue gas after dust removal process is sent into precooling tower 2 by flue 12 by air-introduced machine 13 and is carried out precooling; Absorption liquid through circulating pump 3 to precooling tower 2 atomized sprays;
Desulfurization: pre-cold flue gas enters desulfurizing tower 1 desulfurization; Absorption liquid through circulating pump 3 to desulfurizing tower 1 atomized spray; Flue gas after the desulfurization is through chimney 15 dischargings;
Magnesia slurrying: magnesium oxide powder slurrying in digester 19, slurries are delivered to circulating pump 3 by slush pump 11, carry out flue gas precooling tower 2 and desulfurizing tower 1 atomized spray;
The absorption liquid aeration: air blast 5 is by gas distribution pipe 6, the absorption liquid aeration in circulating water pool 4;
Exsiccation: the magnesium sulfate crystalline solid slurries behind the absorption liquid aeration, send into dewaterer 8 through slurry pump 7 and carry out exsiccation, deviate from water and flow into circulating water pool 4.
Carry out flue gas demist operation after the desulfurization, the flue gas of band water smoke removes water smoke through demister and handles.Flue gas carries out the pre-cold water spray of following current at precooling tower 2, carries out countercurrent spray at desulfurizing tower 1.
The magnesia pulping process is that magnesium oxide powder is admitted in the digester 19 through barrel 23 on cast feeder 21, the vacuum, adds fresh water (FW) and carries out, and carries out slurrying through stirring; Digester 19 is sent into slurries in the slurries pond 9 by delivery pump 18, and slurries pond 9 is delivered to circulating pump 3 water sucking mouths by slush pump 11 with absorption liquid.
Embodiment 2
A kind of heating boiler flue gas desulfur device, the flue gas flue 12 after dust removal process is communicated with precooling tower 2 by air-introduced machine 13, and the precooling tower is communicated with desulfurizing tower 1 through flue, and desulfurizing tower 1 is communicated with the chimney 15 of fume emission; Absorption liquid atomized spray mechanism is arranged in precooling tower 2 and the desulfurizing tower 1; Desulfurizing tower 1 top is provided with demister, and demister is communicated with water pump 17.Absorption liquid circulating water pool 4 is communicated with precooling tower 2 and desulfurizing tower 1 atomized spray circulating pump 3; Aeration gas distribution pipe 6 in the air blast 5 communication loop ponds 4 is arranged; Circulating water pool 4 has slurry pump 7 to be communicated with magnesium sulfate crystalline solid dewaterer 8, and dewaterer 8 has water to flow into the path of circulating water pool 4; Spraying cycle pump 3 is communicated with the digester 19 of magnesium oxide powder slurrying.
The precooling tower has housing, and housing is provided with into mouth, outlet flue and delivery port, and the pipeline that links to each other with housing is installed in the import department of precooling tower 2, and nozzle is connected with pipeline; Desulfurizing tower has housing, is respectively arranged with into mouth, outlet flue and delivery port on the housing, and demister is connected with housing, the pipeline that is connected with housing is installed in the bottom of demister, nozzle is connected with pipeline, and the pipeline that is connected with housing is installed in the top of demister, and nozzle is connected with pipeline.
Be connected with magnesium oxide powder cast feeder 21 on the digester 19 of magnesium oxide powder slurrying, magnesium oxide powder cast feeder 21 has hopper, hopper has magnesium oxide powder negative-pressure air-flow induction system to be communicated with barrel 23 on the vacuum, and barrel 23 bottoms are provided with flashboard A on the vacuum, and flashboard A is communicated with digester 19.
There is agitator 20 to stir in the digester 19; Be communicated with slurries pond 9 through pump, agitator 10 is arranged in the slurries pond.
The concrete structure of present embodiment and operating process thereof:
Magnesium oxide powder is admitted in the digester 19 through barrel 23 on feed intake station 21, the vacuum, digester 19 is sent into absorption liquid in the slurries pond 9 by delivery pump 18, slurries pond 9 is delivered to circulating pump 3 water sucking mouths by slush pump 11 with absorption liquid, flue gas after dust removal process is sent into precooling tower 2 by flue 12 by air-introduced machine 13, enter desulfurizing tower 1 afterwards, to precooling tower 2 and desulfurizing tower 1 atomized spray, the abundant haptoreaction of flue gas and absorption liquid forms MgSO to absorption liquid in the circulating water pool 4 by circulating pump 3
3Mixing material enters circulating water pool 4 from precooling tower 2 and desulfurizing tower 1 bottom by trench 25 respectively, during gas distribution pipe 6 aerations of air blast 5 in circulating water pool 4, this mixing material then oxidation forms magnesium sulfate crystals, circulating pump 3 makes absorption liquid reciprocation cycle between precooling tower 2, desulfurizing tower 1 and circulating water pool 4, magnesium sulfate crystalline solid slurries are sent into dewaterer 8 through slurry pump 7, deviate from water and flow into circulating water pool 4.The flue gas of band water smoke is after demister P removes water smoke, and through chimney 15 dischargings, technology water tank 16 is supplied with demister P wash water and digester 19 slurrying waters by technology water pump 17.Blower fan 13 is sent into precooling tower 2 and desulfurizing tower 1 with flue gas after by valve 26; Flue gas after treatment enters chimney 15 from desulfurizing tower 1 through valve 27; Blower fan 13 is sent into chimney 15 with flue gas by valve 14.Absorption liquid stirs through agitator 20 in the digester 19; Absorption liquid stirs through agitator 10 in the slurries pond 9.
Magnesia powder is poured in the station 21 hopper D that feed intake, and the magnesia powder in the hopper D is transported on the vacuum in the barrel 23 by the negative-pressure air-flow induction system, and barrel 23 bottoms are provided with flashboard A on the vacuum, and flashboard A opens magnesia powder and falls into digester 19.Feed intake the station 21 tops be provided with dedusting fan F, dedusting fan F bottom is filter E, feed intake the station 21 bottoms be hopper D; Barrel 23 tops are provided with back-blowing device C on the vacuum, and back-blowing device C bottom is filter B, and barrel 23 bottoms are flashboard A on the vacuum; Barrel 23 on vacuum blower 24 and the vacuum, barrel 23 is connected with station 21 pipelines that feed intake on the vacuum; Air compressor 22 provides compressed air.
Be used for the precooling tower of above-mentioned heat supply heat boiler flue gas desulfurization, it has housing G, is respectively arranged with into mouth J on the housing G, and outlet flue K and delivery port L is characterized in that: the pipeline H that links to each other with housing G is installed in the import department of precooling tower 2, and nozzle I is connected with pipeline H.The desulfurizing tower that is used for the flue gas desulfurization of above-mentioned heat supply heat boiler, it has housing M, be respectively arranged with into mouth S on the housing M, outlet flue T and delivery port U, it is characterized in that: demister P is connected with housing M, and the pipeline N that is connected with housing M is installed in the bottom of demister P, and nozzle O is connected with pipeline N, the pipeline R that is connected with housing M is installed in the top of demister P, and nozzle Q is connected with pipeline R.
Present embodiment can be with desulfurization and dedusting separately, solves enough that the desulfurized effect that prior art exists is poor, atomizing effect is bad, the easy fouling of desulphurization system, serious, the unstable problem that easily causes secondary pollution, effects on slurry making difference of desulfurization product of discharging flue gas with water problem.
Claims (10)
1. flue gas desulfurization method of heating boiler is characterized in that: flue gas desulfurization technique comprises,
Precooling: the flue gas after dust removal process is sent into precooling tower (2) by flue (12) by air-introduced machine (13) and is carried out precooling; Absorption liquid through circulating pump (3) to precooling tower (2) atomized spray;
Desulfurization: pre-cold flue gas enters desulfurizing tower (1) desulfurization; Absorption liquid through circulating pump (3) to desulfurizing tower (1) atomized spray; Flue gas after the desulfurization discharges through chimney (15);
Magnesia slurrying: magnesium oxide powder slurrying in digester (19), slurries are delivered to circulating pump (3) by slush pump (11), carry out flue gas precooling tower (2) and desulfurizing tower (1) atomized spray;
The absorption liquid aeration: air blast (5) is by gas distribution pipe (6), the absorption liquid aeration in circulating water pool (4);
Exsiccation: the magnesium sulfate crystalline solid slurries behind the absorption liquid aeration, send into dewaterer (8) through slurry pump (7) and carry out exsiccation, deviate from water and flow into circulating water pool (4).
2. according to the described flue gas desulfurization method of heating boiler of claim 1, it is characterized in that: carry out flue gas demist operation after the desulfurization, the flue gas of band water smoke removes water smoke through demister and handles.
3. according to the described flue gas desulfurization method of heating boiler of claim 1, it is characterized in that: flue gas carries out the pre-cold water spray of following current at precooling tower (2), carries out countercurrent spray at desulfurizing tower (1).
4. according to the described flue gas desulfurization method of heating boiler of claim 1, it is characterized in that: the magnesia pulping process is that magnesium oxide powder is admitted in the digester (19) through barrel (23) on cast feeder (21), the vacuum, add fresh water (FW) and carry out, carry out slurrying through stirring; Digester (19) is sent into slurries in the slurries pond (9) by delivery pump (18), and slurries pond (9) deliver to circulating pump (3) water sucking mouth by slush pump (11) with absorption liquid.
5. heating boiler flue gas desulfur device is characterized in that: the flue gas flue (12) after dust removal process is communicated with precooling tower (2) by air-introduced machine (13), and the precooling tower is communicated with desulfurizing tower (1) through flue, and desulfurizing tower (1) is communicated with the chimney (15) of fume emission; In precooling tower (2) and the desulfurizing tower (1) absorption liquid atomized spray mechanism is arranged; Absorption liquid circulating water pool (4) is communicated with precooling tower (2) and desulfurizing tower (1) atomized spray circulating pump (3); Aeration gas distribution pipe (6) in air blast (5) the communication loop pond (4) is arranged; Circulating water pool (4) has slurry pump (7) to be communicated with magnesium sulfate crystalline solid dewaterer (8), and dewaterer (8) has water to flow into the path of circulating water pool (4); Spraying cycle pump (3) is communicated with the digester (19) of magnesium oxide powder slurrying.
6. according to the described heating boiler flue gas desulfur device of claim 5, it is characterized in that: desulfurizing tower (1) top is provided with demister, and demister is communicated with water pump (17).
7. according to the described heating boiler flue gas desulfur device of claim 6, it is characterized in that: the precooling tower has housing, and housing is provided with into mouth, outlet flue and delivery port, and the pipeline that links to each other with housing is installed in the import department of precooling tower (2), and nozzle is connected with pipeline; Desulfurizing tower has housing, is respectively arranged with into mouth, outlet flue and delivery port on the housing, and demister is connected with housing, the pipeline that is connected with housing is installed in the bottom of demister, nozzle is connected with pipeline, and the pipeline that is connected with housing is installed in the top of demister, and nozzle is connected with pipeline.
8. according to the described heating boiler flue gas desulfur device of claim 5, it is characterized in that: be connected with magnesium oxide powder cast feeder (21) on the digester of magnesium oxide powder slurrying (19), magnesium oxide powder cast feeder (21) has hopper, hopper has magnesium oxide powder negative-pressure air-flow induction system to be communicated with barrel (23) on the vacuum, barrel on the vacuum (23) bottom is provided with flashboard (A), and flashboard (A) is communicated with digester (19).
9. according to the described heating boiler flue gas desulfur device of claim 8, it is characterized in that: cast feeder (21) top is provided with dedusting fan (F), and dedusting fan (F) bottom is a filter; Barrel on the vacuum (23) top is provided with back-blowing device, and the back-blowing device bottom is a filter; Barrel (23) on vacuum blower (24) and the vacuum, barrel on the vacuum (23) is connected with cast feeder (21) pipeline; Air compressor (22) pipeline provides compressed air.
10. according to the described heating boiler flue gas desulfur device of claim 5, it is characterized in that: have agitator (20) to stir in the digester (19); Be communicated with slurries ponds (9) through pump, agitator (10) is arranged in the slurries pond.
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| CN102728210A (en) * | 2012-07-11 | 2012-10-17 | 上海交通大学 | Device for forced oxidation treatment of magnesium-method fume desulfurization slag slurry |
| CN105013318A (en) * | 2015-07-31 | 2015-11-04 | 安徽省化工设计院 | Flue gas desulfurization system |
| CN106178905A (en) * | 2016-09-12 | 2016-12-07 | 山东泰北环保设备股份有限公司 | There is the desulfurizing tower held one's breath with aerator |
| CN108310935A (en) * | 2018-04-23 | 2018-07-24 | 焦作市雾神化工设备有限公司 | A kind of magnesium oxide method desulfurizing and drying all-in-one machine and construction method |
| CN112933905A (en) * | 2021-01-29 | 2021-06-11 | 乌海宝杰新能源材料有限公司 | Efficient and energy-saving graphitized tail gas treatment system and treatment process thereof |
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| CN102728210B (en) * | 2012-07-11 | 2014-10-15 | 上海交通大学 | Device for forced oxidation treatment of magnesium-method fume desulfurization slag slurry |
| CN105013318A (en) * | 2015-07-31 | 2015-11-04 | 安徽省化工设计院 | Flue gas desulfurization system |
| CN106178905A (en) * | 2016-09-12 | 2016-12-07 | 山东泰北环保设备股份有限公司 | There is the desulfurizing tower held one's breath with aerator |
| CN106178905B (en) * | 2016-09-12 | 2019-02-22 | 山东泰北环保设备股份有限公司 | With the desulfurizing tower held one's breath with aerator |
| CN108310935A (en) * | 2018-04-23 | 2018-07-24 | 焦作市雾神化工设备有限公司 | A kind of magnesium oxide method desulfurizing and drying all-in-one machine and construction method |
| CN112933905A (en) * | 2021-01-29 | 2021-06-11 | 乌海宝杰新能源材料有限公司 | Efficient and energy-saving graphitized tail gas treatment system and treatment process thereof |
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