CN203155083U - In-tower pH value regionally-differentiated wet desulfurization device - Google Patents
In-tower pH value regionally-differentiated wet desulfurization device Download PDFInfo
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- CN203155083U CN203155083U CN 201320146308 CN201320146308U CN203155083U CN 203155083 U CN203155083 U CN 203155083U CN 201320146308 CN201320146308 CN 201320146308 CN 201320146308 U CN201320146308 U CN 201320146308U CN 203155083 U CN203155083 U CN 203155083U
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Abstract
The utility model discloses an in-tower pH value regionally-differentiated wet desulfurization device, relating to the field of prevention and treatment of air pollution. The in-tower pH value regionally-differentiated wet desulfurization device comprises an absorption tower (14), a circulating pump (8), an oxidation blower (11), a gypsum discharge pump (9), a demister (13) and a limestone slurry supply pipe system (10). The utility model is characterized in that the limestone slurry supply pipe system enters corresponding circulating pump pipelines through a plurality of branched pipes. The pH value of a spray region (6) is enhanced; and meanwhile, a slurry tank (7) does not directly supplement the limestone slurry or reduce the limestone slurry to lower the pH value, thereby adjusting the pH value difference between the upper and lower reaction regions. Each branched pipe is correspondingly provided with an adjustment gate and a rinsing water gate, and the adjustment gate is adjusted by a DCS. The utility model enhances the desulfurization efficiency, lowers the power consumption, increases the utilization ratio of the raw material calcium carbonate, improves the oxidation effect of calcium sulfite in the absorption tower, and strengthens the crystallization of gypsum.
Description
Affiliated technical field
The utility model relate to a kind of in wet desulphurization absorption tower the differential responses district adopt different pH values, reach the raising desulfuration efficiency, improve the utilization rate of raw material calcium carbonate, improve the oxidation effectiveness of calcium sulfite in the absorption tower, and the crystallization of reinforcement gypsum.This utility model relates to the prevention and control of air pollution field.
Background technology
The limestone-gypsum wet desulfurizing process is that current China is most widely used, the fume desulphurization method that effect is best, and the design desulfuration efficiency can reach more than 95%.The limestone-gypsum wet desulfurizing process mainly contains pulping system, absorption tower system, dewatering system.Described absorption tower system comprises absorption tower, circulating pump, oxidation fan, gypsum excavationg pump, lime stone flow inlet etc.Be disposed with slurries pond, spraying layer, demister in the described absorption tower from the bottom to top, gas approach is arranged on the tower body of spraying layer below, and exhanst gas outlet is arranged on the top of tower body.The chemical reaction zone on absorption tower is divided into spray district and slurries pond, and the spray district mainly is that slurries absorb sulfur dioxide, generates calcium sulfite with calcium carbonate reaction.The slurries pond is mainly forced into calcium sulfate by the air that oxidation fan is sent here to calcium sulfite, and forms gypsum crystallization.Slurries in the slurries pond enter circulating pump from pump entry, spray with vaporific form from shower through the circulating pump pressurization, fall into the slurries pond.Flue gas enters the absorption tower from smoke inlet, upwards contacts with the slurries that sprays along spray district, sponges sulfur dioxide wherein, and the process demister removes behind the mist elimination pearl from exhanst gas outlet discharged to atmosphere or enter chimney.The desulfurizing agent lime stone slurry directly enters the absorption tower from pulping system, and the gypsum of generation goes the dewatering system dehydration from the gypsum excavationg pump.
The pH value of slurries descends owing to absorbing sulfur in smoke in the spray district in the absorption tower, pulping system directly supplies lime stone slurry by the lime stone flow inlet in the absorption tower, improve the pH value in slurries pond, after both reach balance, slurries pond, absorption tower will keep a stable pH value, and the pH value at the nozzle place of the pH value in slurries pond and spraying layer is identical.PH value is as follows to the influence relation of desulphurization system: improve the raising that pH value is conducive to desulfurization degree, but be unfavorable for the dissolving of lime stone, reduced the gypsum quality, raw material have been wasted, reduced the forced oxidation effect and caused calcium sulfite oxidation thoroughly fouling, clogging not to take place, be unfavorable for that also gypsum crystallization separates out.Otherwise reduce pH value and then can reduce desulfuration efficiency, but be conducive to the dissolving of lime stone, be conducive to calcium sulfite forced oxidation calcium sulfate, and be beneficial to gypsum crystallization and separate out.This can't solve contradiction always, and pH value generally is selected between the 5.2-5.8 in actual applications.
Summary of the invention
In order to overcome above-mentioned contradiction, in desulphurization system, introduce pH value subregion differentiation device, effectively solved the contradiction of pH value, can obtain higher desulfuration efficiency and considerable cost savings.
The concrete technical scheme of the utility model is: the lime stone slurry flow inlet is received in the slurry circulating pump pipeline, and the slurry circulating pump pipeline refers to this depot siding (3) to (1) from Fig. 1.The lime stone slurry of considering adding will fully mix with original slurries in the pipeline, best access point is in circulation pump intake piping section, being about to the lime stone slurry flow inlet receives between (3) to (8) among Fig. 1, like this, lime stone slurry fully mixes with slurries after circulating pump impeller stirs, the PH of mixed serum can reach 6-8 even higher, and the Ca/S of slurries significantly is provided.Concrete pH value is controlled by the flow of control lime stone slurry, and the limestone slurry flow quantity is regulated by control valve.Higher pH value slurries contact with flue gas by spray, accelerate the absorption of sulfur dioxide greatly, increase substantially desulfuration efficiency.Slurries fall into the slurries pond through spray, and owing to having absorbed a large amount of sulfur dioxide, pH value significantly reduces, and a lower pH value will be kept in the slurries pond always owing to no longer mend lime stone slurry toward slurries pond, absorption tower or only mend slurry on a small quantity this moment.The pH value in slurries pond has been realized two reaction zone pH value differentiation up and down far below the pH value at spraying layer nozzle place like this.The solubility of calcium carbonate in water is very little, decomposes slowly, and from the angle of microcosmic, the reaction resistance of sulfur dioxide and calcium carbonate is mainly at solid-liquid interface, rather than at liquid-vapor interface.The raising pH value is actually and has improved Ca/S, has increased the concentration of calcium carbonate greatly, and it is long-pending to have improved specific grain surface, has reduced the solid-liquid resistance.And the absorption of sulfur dioxide is to finish in spray district, and slurries are ejected into from shower and fall into the slurries pond and have only several seconds to tens seconds time, so we will treasure the short time, improve the pH value of slurries as far as possible.And the forced oxidation of the dissolving of limestone particle, calcium sulfite, gypsum crystallization mainly occur in the slurries pond, and this process is slower, therefore our the reduction pH value that need try one's best improves dissolving, the forced oxidation of calcium sulfite, the gypsum crystallization speed of limestone particle.The solution that the utility model is just right this problem.
The differential wet desulphurization device of pH value subregion in the tower, comprise absorption tower, circulating pump, oxidation fan, gypsum excavationg pump, lime stone slurry flow inlet system, it is characterized in that: described lime stone slurry flow inlet system inserts in the circulating pump pipeline, described circulating pump pipeline refers to pick out from the absorption tower, through circulating pump, to this depot siding of spraying layer, described access comprises directly and access indirectly.Lime stone slurry flow inlet system enters in many corresponding circulating pump pipelines by the multiple branches pipe.Each branched pipe of lime stone slurry flow inlet system is provided with adjustment doors and flushing pipe.
Usually desulfuration absorbing tower has several circulating pumps, can for all pump entry places a lime stone slurry flow inlet be set all by branched pipe, also can only arrange wherein several, and this actual needs according to desulphurization system is determined.Wherein a branched pipe inserts the absorption tower, be that the lime stone slurry flow inlet that original sulfur method directly enters the slurries pond is kept, in order to keep the certain PH initial value in slurries pond when system's initial start-up, two reaction zone pH values is poor about also being used for simultaneously adjusting.Every lime stone slurry is mended slurry Guan Douying an adjustment doors and corresponding wash tub pipe is set.Be in operation like this when switching circulating pump, can switch easily in the past.Adjustment doors realizes automatic adjusting by DCS according to desulfurization degree.
Effect of the present utility model is: 1 can significantly improve desulfuration efficiency.2 can tackle the operating mode that the flue gas sulfur content surpasses design objective, because the influence of market supply, make the ature of coal of using have larger difference with the design ature of coal, former design desulfurizer can not satisfy the sulfur dioxide (SO2) emissions index, the desulfurizer extending capacity reformation of having to is so this technology also is applicable to transformation project.3 under the prerequisite that reaches sulfur dioxide environment protection emission index, can drive 1-2 platform circulating pump less, has saved the loss of electric energy and minimizing equipment greatly, after lacking the open cycle pump simultaneously, reduce the whitewashing amount, so just reduced the resistance to flue, so also reduced the power consumption of blower fan.4 save amount of lime greatly, and the lower pH value in slurries pond makes limestone particle obtain dissolving fully completely, has improved the utilization rate of lime stone.5 reduce the generation of fouling, because calcium sulfite is fallen by good forced oxidation, equipment such as the pipeline of desulphurization system, demister the fouling clogging can not take place.6 improve greatly the gypsum qualities, and gypsum crystallization is good, and lime stone, calcium sulfite content are few.The 7 desulfurization degree fluctuation that the reply flue gas load changes and the fluctuation of flue gas sulfur content causes flexibly, only need be by regulating the lime stone slurry control valve of circulating pump, just can change the pH value of sprayed slurry, and then adjustment desulfuration efficiency, adjustment process can be controlled automatically with DCS, need not the frequent start-stop circulating pump or takes other measures.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Fig. 1 is overall schematic of the present utility model.
Fig. 2 is lime stone slurry flow inlet system diagram, is that label is 10 detailed diagram among Fig. 1.
Label implication among Fig. 1: 1. spraying layer, 2. slurries pond and spray regional boundary face, 3. slurries enter the entrance of circulating pump from the slurries pond, 4. smoke inlet, 5. exhanst gas outlet, 6. spray district, 7. slurries pond, 8. circulating pump, 9. gypsum excavationg pump, 10. lime stone slurry flow inlet system, 11. oxidation fan, 12. insert the oxidation airduct in slurries pond, 13. demisters, 14. absorption towers.
Label implication among Fig. 2: 1. lime stone slurry is for the slurry arm, and 2. lime stone is for the total flowmeter for pipe of slurry, 3. lime stone slurry flow inlet adjustment doors, and 4. lime stone slurry flow inlet wash tub pipe, 5. lime stone slurry is for the slurry house steward.
The specific embodiment
In Fig. 1, slurries by slurries entrance (3), after circulating pump (8) pressurization, from spraying layer (1) ejection, fall into slurries pond (7) from slurries pond (7) at last.The flue gas that needs to handle enters spray district (6) from smoke inlet (4), contact with the slurries that spray from spraying layer (1), after sponging sulfur dioxide wherein, except behind the mist elimination pearl, enter chimney or discharged to atmosphere from exhanst gas outlet (5) through demister (13).Oxidation fan (11) is by the calcium sulfite of oxidation airduct (12) to slurries pond (7) injection force air oxidation slurries, and the gypsum that reaction generates is discharged to the dewatering system dehydration by gypsum excavationg pump (9).Lime stone slurry is mended slurry by lime stone slurry flow inlet system (10) to the circulating pump pipeline, and it is poor to adjust the slurries pH value.This Fig. 1 has drawn 3 circulating pumps, and the several border factually of the platform of desulphurization system circulating pump situation is come fixed.
In Fig. 2, the lime stone slurry that pulping system is come, after the process lime stone is done metering for the total flowmeter for pipe of slurry (2) to flow, be divided into four lime stone slurries for slurry arm (1), every lime stone slurry confession slurry arm (1) has lime stone slurry flow inlet adjustment doors (3) separately, and it is poor to be used for regulating absorption tower slurries pH value.Wherein an arm directly enters slurries pond, absorption tower, and other three are inserted corresponding circulating pump.Every lime stone slurry has corresponding lime stone slurry flow inlet rinse water valve (4) for slurry arm (1).
Claims (3)
1. the differential wet desulphurization device of pH value subregion in the tower, comprise absorption tower, circulating pump, oxidation fan, gypsum excavationg pump, lime stone slurry flow inlet system, it is characterized in that: described lime stone slurry flow inlet system inserts in the circulating pump pipeline, described circulating pump pipeline refers to pick out from the absorption tower, through circulating pump, to this depot siding of spraying layer, described access comprises directly and access indirectly.
2. the differential wet desulphurization device of pH value subregion in the tower according to claim 1, it is characterized in that: lime stone slurry flow inlet system enters in many corresponding circulating pump pipelines by the multiple branches pipe.
3. the differential wet desulphurization device of pH value subregion in the tower according to claim 1, it is characterized in that: each branched pipe of lime stone slurry flow inlet system is provided with adjustment doors and flushing pipe.
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| CN 201320146308 CN203155083U (en) | 2013-03-28 | 2013-03-28 | In-tower pH value regionally-differentiated wet desulfurization device |
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| CN 201320146308 CN203155083U (en) | 2013-03-28 | 2013-03-28 | In-tower pH value regionally-differentiated wet desulfurization device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104645817A (en) * | 2015-02-13 | 2015-05-27 | 上海电气电站环保工程有限公司 | Single-tower multi-pH-value graded spraying control desulfurization system and process |
| CN106237793A (en) * | 2016-08-16 | 2016-12-21 | 白银有色集团股份有限公司 | A kind of single-stage double-suction receives tail gas absorber |
| CN106362559A (en) * | 2016-11-17 | 2017-02-01 | 山东大学 | Gradient adjustment method of limestone content in wet desulphurization circulating liquid |
| CN110813043A (en) * | 2019-11-21 | 2020-02-21 | 湖南恒光科技股份有限公司 | Carbide slag/slurry flue gas desulfurization system and method |
-
2013
- 2013-03-28 CN CN 201320146308 patent/CN203155083U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104645817A (en) * | 2015-02-13 | 2015-05-27 | 上海电气电站环保工程有限公司 | Single-tower multi-pH-value graded spraying control desulfurization system and process |
| CN104645817B (en) * | 2015-02-13 | 2017-12-19 | 上海电气电站环保工程有限公司 | The more pH classified sprayings control desulphurization systems of single column and technique |
| CN106237793A (en) * | 2016-08-16 | 2016-12-21 | 白银有色集团股份有限公司 | A kind of single-stage double-suction receives tail gas absorber |
| CN106362559A (en) * | 2016-11-17 | 2017-02-01 | 山东大学 | Gradient adjustment method of limestone content in wet desulphurization circulating liquid |
| CN106362559B (en) * | 2016-11-17 | 2019-04-12 | 山东大学 | The gradient adjusting method of limestone content in a kind of wet desulphurization circulation fluid |
| CN110813043A (en) * | 2019-11-21 | 2020-02-21 | 湖南恒光科技股份有限公司 | Carbide slag/slurry flue gas desulfurization system and method |
| CN110813043B (en) * | 2019-11-21 | 2022-03-04 | 湖南恒光科技股份有限公司 | Carbide slag/slurry flue gas desulfurization system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: YONKER ENVIRONMENTAL PROTECTION CO., LTD. Free format text: FORMER OWNER: YIN HUI Effective date: 20150116 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 410208 CHANGSHA, HUNAN PROVINCE TO: 410329 CHANGSHA, HUNAN PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20150116 Address after: 410329 Liuyang City, Hunan Province, the National Bio pharmaceutical industry base (next to the national highway 319) Patentee after: YONKER ENVIRONMENTAL PROTECTION Co.,Ltd. Address before: Yuelu District City, Hunan province 410208 Changsha Hanpu Science Park as the mouth Road No. 96 building 1407 room 29 Genting Verde Patentee before: Yin Hui |
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| CX01 | Expiry of patent term |
Granted publication date: 20130828 |
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| CX01 | Expiry of patent term |