CN105289268A - Limestone-gypsum wet flue gas desulfurization invalid pulp treatment device - Google Patents
Limestone-gypsum wet flue gas desulfurization invalid pulp treatment device Download PDFInfo
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- CN105289268A CN105289268A CN201510841222.0A CN201510841222A CN105289268A CN 105289268 A CN105289268 A CN 105289268A CN 201510841222 A CN201510841222 A CN 201510841222A CN 105289268 A CN105289268 A CN 105289268A
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Abstract
The invention discloses a limestone-gypsum wet flue gas desulfurization invalid pulp treatment device which comprises a pulping tank, an absorption tower, a stirrer, a booster fan, an oxidation air blower, a conveying pump, a pulp storage tank, a gypsum swirler, a vacuum belt filter, a wastewater swirler, a wastewater treatment system, valves and valve connection pipelines. The device is characterized in that an invalid pulp conveying pipeline is arranged; one end of the invalid pulp conveying pipeline is connected with the output pipeline of the pulp storage tank; the other end of the invalid pulp conveying pipeline is connected with the pulp discharging pipelines of the absorption tower; the valves are arranged on the invalid pulp conveying pipeline. The device is simple in structure and easy to produce, and can be utilized for rapidly and effectively treating invalid pulp, so as to improve the stability of desulfuration operation and the desulfuration efficiency, and reduce the desulfuration cost.
Description
Technical field
The present invention relates to a kind of wet desulfurization of flue gas by limestone-gypsum method technology, particularly relate to a kind of wet desulfurization of flue gas by limestone-gypsum method inefficacy slurries treating apparatus.
Background technology
In recent years, sintering flue gas desulfurization technology is widely applied at China's steel industry.The desulfur technology of current employing mainly contains wet method, dry method, semidry method.Wet method mainly contains limestone-gypsum method, sulphur ammonium method, magnesium oxide method, Dual alkali, ionic liquid method.Dry method mainly contains the ciculation fluidized bed process of LJS, ENS method, dense-phase tower method, the ciculation fluidized bed process of GSCA Two-way Cycle, MEROS in duct sorbent injection method, active carbon adsorption, NID flue round-robin method.Semidry method mainly contains SDA rotary spraying technique etc.
Limestone-gypsum method flue gas desulfurization technology is a kind of flue gas desulfurization technique of full-fledged, extensive use, and desulfuration efficiency can reach more than 95%.Through research and the optimization of decades, the technical problems such as original fouling, blocking and wearing and tearing successfully solve.Limestone-gypsum method usually adopt by large electric power plant station, be also widely used in the flue gas desulfurization of sintering flue gas desulfurization, Industrial Boiler/stove at present.
Limestone-gypsum method is the S0 absorbed with lime stone slurry in flue gas
2, reaction generates calcium sulfite, is further oxidized to calcium sulphate dihydrate (gypsum) in the stock tank of absorption tower, and the gypsum slurries after oxidation generates the gypsum that water content is less than 10% after concentrating, dewatering, as commodity selling.
Wet desulfurization of flue gas by limestone-gypsum method system is normally run: in the water prestored in pulping tank before system boot, limit adds the stirring of agstone limit, and preparation lime stone slurry, detects that concentration of slurry is at 1100-1250kg/m
3in scope, stop reinforced, by reaching certain liquid level in lime stone slurry transport pump to absorption tower, then absorption tower agitator, oxidation fan, demister and slurry circulating pump etc. are opened, the stable rear startup booster fan of machine to be sintered, introduce flue gas and carry out desulfurization, the neat stress after up to standard is arranged outward through direct exhaust chimney.According to outlet SO in operation
2in concentration, tower, plasm PH value etc. adjust serum recycle pump operation number of units, lime stone slurry addition etc., guarantee to export SO
2meet environmental requirement discharge; When in absorption tower, concentration of slurry reaches 1150-1200kg/m
3time, open gypsum slurries excavationg pump, slurries in tower are drained into vacuum belt dewaterer and dewaters, product is gypsum, and waste water enters Waste Water Treatment and focuses on.
The subject matter existed in wet desulfurization of flue gas by limestone-gypsum method system is that absorption tower slurries lost efficacy, its main cause is because COD, BOD equal size in magnesium ion, water in dust, organic matter, heavy metal, tar, ammonia nitrogen, chlorine and desulfurizing agent in flue gas exceeds standard in flue gas desulphurization system running, harmful element enrichment makes absorption tower slurries quality run down, thus hinder the desulphurization reaction of lime stone slurry, cause absorption tower slurries to lose efficacy.The slurries lost efficacy will cause desulfuration efficiency to decline, outlet SO
2concentration rises, cannot qualified discharge.After slurries lost efficacy, according to circumstances general employing adds the modes such as defoamer, synergist and grout replacement and processes.Add defoamer, synergist processing mode generally for very slight failure conditions, manage improve desulfuration efficiency, this way is cured the symptoms, not the disease, and adds processing cost; Grout replacement in system cloud gray model, adds fresh limestone slurries progressively replace inefficacy slurries (slurries renewal amount is determined according to failure conditions), required time swap longer (generally needing one week), and effect is unstable, sometimes a month effect is replaced still not obvious, last still have to desulphurization system to stop, emptying, all upgrade slurries, operational percentage, the operational effect of this not influence of light desulphurization system, also add the cost of desulfurization operation.Therefore, how efficiently, easy, reliably process absorption tower inefficacy slurries problem, be the key guaranteeing desulfurization equipment stable operation.
Summary of the invention
The object of this invention is to provide a kind of structure simple, easy to use, can efficiently, the treating apparatus of convenient disposal wet desulfurization of flue gas by limestone-gypsum method inefficacy slurries.
The present invention realizes above-mentioned purpose by the following technical solutions: a kind of wet desulfurization of flue gas by limestone-gypsum method inefficacy slurries treating apparatus, comprise pulping tank, absorption tower, agitator, booster fan, oxidation fan, delivery pump, slurries hold-up tank, gypsum cyclone, vacuum belt dewaterer, waste-water vortex device, Waste Water Treatment, valve and connecting pipe thereof, it is characterized in that, inefficacy slurries conveyance conduit is set, its one end is connected with the output channel of slurries hold-up tank, the other end is connected with the slurry discharge line on absorption tower, described inefficacy slurries conveyance conduit is provided with valve.
Before using the present invention, the slurries that lost efficacy in absorption tower can not shut down and be all delivered to slurries hold-up tank in short-term, when inefficacy slurries are emptying, fresh limestone slurries inject rapidly, reach liquid level line fast, and flue gas desulfurization is carried out as usual.Inefficacy slurries delivery pump enters absorption tower slurry discharge line by inefficacy slurries conveyance conduit, be transported to gypsum cyclone by delivery pump again, vacuum belt dewaterer, waste-water vortex device carry out gypsum dehydration, wastewater treatment, to reach when not affecting desulphurization system and normally running, the object of efficient handling failure slurries.
Advantage of the present invention is:
1, structure is simple, makes easily;
2, handling failure slurries are quick, effective, improve stability and the desulfuration efficiency of desulfurization operation, also reduce desulphurization cost simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention is applied to flue gas desulphurization system.
In figure: 1, pulping tank, 2, absorption tower, 3, agitator, 4, booster fan, 5, oxidation fan, 6, delivery pump, 7, slurries hold-up tank, 8, gypsum cyclone, 9, vacuum belt dewaterer, 10, waste-water vortex device, 11, Waste Water Treatment, 12, valve, 13, inefficacy slurries conveyance conduit, 14, spraying layer, 15, demister.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further elaborated.As shown in Figure 1, a kind of wet desulfurization of flue gas by limestone-gypsum method inefficacy slurries treating apparatus, comprise pulping tank 1, absorption tower 2, agitator 3, booster fan 4, oxidation fan 5, delivery pump 6, slurries hold-up tank 7, gypsum cyclone 8, vacuum belt dewaterer 9, waste-water vortex device 10, Waste Water Treatment 11, valve 12 and connecting pipe thereof, it is characterized in that, inefficacy slurries conveyance conduit 13 is set, its one end is connected with the output channel of slurries hold-up tank 7, the other end is connected with the slurry discharge line on absorption tower 2, described inefficacy slurries conveyance conduit 13 is provided with valve 12.
See Fig. 1, pulping tank 1 prestores under normal circumstances and configures water needed for lime stone slurry, adds agstone fast when needing from limestone powder bin, preparation lime stone slurry.Absorption tower 2 squeezed into by the lime stone slurry delivery pump 6 prepared, and is stored in the bottom on absorption tower 2, and reaches design liquid level, as 360m
2flue gas of sintering machine Systematical control liquid level is 6m.Then open agitator 3, oxidation fan 5, demister 15 and serum recycle delivery pump 6 in absorption tower 2, the slurries bottom absorption tower 2 are transported to spraying layer 14; The stable rear startup booster fan 4 of machine to be sintered, the flue gas of coming from sintering machine head dust removing device enters absorption tower 2 through desulphurization system booster fan 4, at the middle part on absorption tower 2, the lime stone slurry adverse current generation chemical reaction that flue gas and spraying layer 14 spray, removes SO in flue gas
2, flue gas up to standard is arranged after demister 15 demist from direct exhaust chimney; When in absorption tower 2, serum density reaches 1150-1200kg/m
3during scope, open the delivery pump 6 on gypsum slurries discharge line, slurries enter gypsum cyclone 8 and carry out initial gross separation, lower floor's turbid solution enters vacuum belt dewaterer 9 and dewaters further, product is gypsum, supernatant liquor enters waste-water vortex device 10 and is separated further, enters Waste Water Treatment 11 carry out wastewater treatment from waste-water vortex device 10 supernatant liquor out.
In Fig. 1, the top of slurries hold-up tank 7 is provided with pipeline, on the slurry discharge line being connected to absorption tower 2 by valve 12 after delivery pump 6; On the output channel of slurries hold-up tank 7 bottom after delivery pump 6, be connected with two-way pipeline: on the slurry discharge line that valve 12 of leading up to is connected to absorption tower 2 before delivery pump 6, i.e. inefficacy slurries conveyance conduit 13; Valve 12 of separately leading up to is connected to the bottom on absorption tower 2.The effect of slurries hold-up tank 7 is that inside, absorption tower 2 is broken down when needing maintenance or slurries to lose efficacy, interim storage slurries, and according to circumstances post-processed is carried out to storage slurries: during maintenance down, in absorption tower 2, slurries are still effective, in order to continue to use, reduce processing cost, now close the valve 12 led on gypsum cyclone 8 pipeline, open the valve 12 in the upper pipe of slurries hold-up tank 7 and the delivery pump 6 on gypsum slurries discharge line, in absorption tower 2, slurries all flow into slurries hold-up tank 7 and store, overhaul complete, open the valve 12 and delivery pump 6 that lead in the bottom pipe of absorption tower 2, slurries return to the bottom on absorption tower 2, when detecting that desulfuration efficiency declines, outlet SO
2concentration rises, possibly cannot qualified discharge time, illustrate that slurries are about to lose efficacy, now close the valve 12 led on gypsum cyclone 8 pipeline, valve 12 in the upper pipe of slurries hold-up tank 7 and the delivery pump 6 on gypsum slurries discharge line are opened, in absorption tower 2, inefficacy slurries all flow into slurries hold-up tank 7 and store, then delivery pump 6 on the output channel of slurries hold-up tank 7 bottom is opened, lead to the valve 12 on inefficacy slurries conveyance conduit 13, delivery pump 6 on the slurry discharge line on absorption tower 2 and the valve 12 led on gypsum cyclone 8 pipeline, inefficacy slurries are transported to gypsum cyclone 8, vacuum belt dewaterer 9, gypsum deviate from by waste-water vortex device 10, wastewater treatment.
The above, be only the present invention's preferably detailed description of the invention, but scope is not limited thereto, and is equal to and replaces or change, all should be encompassed within protection scope of the present invention according to technical scheme of the present invention and inventive concept thereof.
Claims (1)
1. a wet desulfurization of flue gas by limestone-gypsum method inefficacy slurries treating apparatus, comprise pulping tank, absorption tower, agitator, booster fan, oxidation fan, delivery pump, slurries hold-up tank, gypsum cyclone, vacuum belt dewaterer, waste-water vortex device, Waste Water Treatment, valve and connecting pipe thereof, it is characterized in that, inefficacy slurries conveyance conduit is set, its one end is connected with the output channel of slurries hold-up tank, the other end is connected with the slurry discharge line on absorption tower, and described inefficacy slurries conveyance conduit is provided with valve.
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| CN201510841222.0A CN105289268A (en) | 2015-11-28 | 2015-11-28 | Limestone-gypsum wet flue gas desulfurization invalid pulp treatment device |
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| CN201510841222.0A CN105289268A (en) | 2015-11-28 | 2015-11-28 | Limestone-gypsum wet flue gas desulfurization invalid pulp treatment device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106110866A (en) * | 2016-08-08 | 2016-11-16 | 四川德胜集团钒钛有限公司 | A kind of flue gas desulphurization system |
| CN111760427A (en) * | 2020-06-28 | 2020-10-13 | 淮南北新建材有限公司 | Gypsum board production line, gas treatment device and gas treatment method thereof |
| CN112973188A (en) * | 2021-03-24 | 2021-06-18 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | System for deeply treating slurry foaming of desulfurization absorption tower |
| CN115006988A (en) * | 2022-07-06 | 2022-09-06 | 河南城建学院 | Desulfurization and denitrification dust removal device |
| CN118217809A (en) * | 2024-05-24 | 2024-06-21 | 河南峰业环保科技有限公司 | Gypsum slurry dewatering device in wet flue gas desulfurization system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106110866A (en) * | 2016-08-08 | 2016-11-16 | 四川德胜集团钒钛有限公司 | A kind of flue gas desulphurization system |
| CN111760427A (en) * | 2020-06-28 | 2020-10-13 | 淮南北新建材有限公司 | Gypsum board production line, gas treatment device and gas treatment method thereof |
| CN112973188A (en) * | 2021-03-24 | 2021-06-18 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | System for deeply treating slurry foaming of desulfurization absorption tower |
| CN115006988A (en) * | 2022-07-06 | 2022-09-06 | 河南城建学院 | Desulfurization and denitrification dust removal device |
| CN118217809A (en) * | 2024-05-24 | 2024-06-21 | 河南峰业环保科技有限公司 | Gypsum slurry dewatering device in wet flue gas desulfurization system |
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Application publication date: 20160203 |