CN101468288B - Desulfurizer suitable for sulfuric dioxide of large-scope change and control method thereof - Google Patents
Desulfurizer suitable for sulfuric dioxide of large-scope change and control method thereof Download PDFInfo
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- CN101468288B CN101468288B CN200710304066XA CN200710304066A CN101468288B CN 101468288 B CN101468288 B CN 101468288B CN 200710304066X A CN200710304066X A CN 200710304066XA CN 200710304066 A CN200710304066 A CN 200710304066A CN 101468288 B CN101468288 B CN 101468288B
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Abstract
The present invention discloses a desulphurization unit adapting to the change of sulfur dioxide in a large scale and a control method thereof, and in particular relates to a desulphurizer slurry supply system for an absorption tower of the desulphurization unit for a fuel electric plant in the technical field of environmental protection. The desulphurizer slurry supply system comprises a slurry circulating pump which is provided with a spraying layer and forms self circulation, an absorption tower of a gypsum discharge pump, and a limestone slurry tank provided with a limestone slurry densitometer and a limestone slurry discharge pump. The limestone slurry discharge pump communicates the limestone slurry tank with the lower part of the absorption tower through a slurry flow meter and a slurry delivery pipe. The desulphurization unit has the structural characteristic that the slurry delivery pipe consists of a first slurry supply pipe and a second slurry supply pipe which are connected in parallel. The first slurry pipe is connected with an electric adjustable valve and a first butterfly valve in series, the second slurry supply pipe is connected with a hand-operated valve and a second butterfly valve in series, and the electrical control, the first butterfly valve second and the butterfly valve can achieve automatic control. The desulphurizer slurry supply system can meet characteristics of small investment, small engineering work load, high automation degree, convenient adjustment, and stable running.
Description
Technical field
The present invention relates to the desulfurizer slurry supply system of environmental technology field thermal power plant desulfurizer absorbing tower, particularly adapt to the desulfurizer and the control method thereof of sulfur dioxide concentration large-scope change.
Background technology
In recent years, along with the raising gradually of environmental requirement, in order to reduce the discharge capacity of SO2 in the power-plant flue gas, many power plant have increased desulfurizer, and its nucleus equipment is the absorption tower.The bottom on absorption tower is the absorbent slurry pond, and absorbent adopts lime stone usually.Stock tank top is the former smoke inlet of boiler, and the position that makes progress again is some spraying layers.Slurry circulating pump is extracted slurries out from the slurries pond, become a large amount of liquid mists by the spraying layer absorbent slurry, carries out the heat and mass exchange with former flue gas is reverse, thereby removes the SO in the flue gas
2SO in the flue gas
2In the slurries pond mainly with HSO
3 -Form exist, by in stock tank, blasting oxidation wind, finally become gypsum (CaSO
42H
2O).
Desulfurizer absorbing tower has very strong adaptability to boiler load under design coal or check coal condition, generally can both reach the desulfuration efficiency of design.Yet because China is vast in territory, coal is numerous, and ature of coal is also very different.Most of power plant all are difficult to the source of control coal, combustion stablized coal.This just causes the sulphur component of boiler of power plant burning coal, and often difference is very big, thereby the sulfur content in the former flue gas changes also very greatly.Desulfurizer absorbing tower is through the high SO that is everlasting
2Move under the condition of concentration, cause the slurries pH value low excessively, desulfuration efficiency descends, the generation of a lot of problems such as pipeline equipment seriously corroded.
Desulfurizer lime stone flow inlet line of the prior art adopts the pattern of pipeloop usually, and lime stone slurry is pumped to the absorption tower by lime stone slurry, realizes for the slurry arm by the single of pipeloop to the lime stone slurry of absorption tower supply.And the flow of limestone slurry liquid pump is far above the limestone slurry liquid measure of actual needs in the absorption tower, and the limestone slurry liquid measure of actual provision is by realizing for the electric control valve on the slurry arm.This shortcoming for the slurry form is:
When the power plant soot sulfur content surpassed design load, stock volume can be obviously not enough, thereby the absorption tower can't safe operation; Simultaneously when the lower or coal-fired sulfur content of boiler load during far below design load, the stock volume demand seldom, not only motorized adjustment valve regulation inconvenience, and can increase system's local resistance, the valve serious wear.
Summary of the invention
In order to solve the shortcoming that exists in the above-mentioned prior art, the purpose of this invention is to provide a kind of desulfurizer and control method thereof that adapts to the sulfur dioxide concentration large-scope change.It can satisfy the requirement of different atures of coal to different lime slurries amount, has small investment, quantities is little, automaticity is high, easy to adjust, stable characteristics.
In order to reach the foregoing invention purpose, technical scheme of the present invention realizes as follows:
The desulfurizer that adapts to the sulfur dioxide concentration large-scope change, it comprises band spraying layer, the slurry circulating pump that forms self-loopa and the absorption tower of gypsum excavationg pump, the lime stone slurry case of band lime stone slurry densitometer and lime stone slurry rear pump.The lime stone slurry rear pump is communicated with the lime stone slurry case by slurry flow meter and slurries transfer pipeline with the bottom on absorption tower.Its design feature is that described slurries transfer pipeline is to be composed in parallel by flow inlet road one and flow inlet road two.Be serially connected with motor regulated valve and butterfly valve one on the flow inlet road one, be serially connected with hand-operated valve and butterfly valve two on the flow inlet road two, motor regulated valve, butterfly valve one and butterfly valve two all can be realized automatic control.
Realize the control method of above-mentioned desulfurizer, its key step is:
1. by the sulfur dioxide removal efficient of control module, revise the pH value of slurries in the absorption tower according to former sulfur dioxide in flue gas concentration, calcium sulfur ratio, liquid-gas ratio and needs.Lime stone slurry density and flow rate calculation lime stone slurry with the lime stone slurry case consume, and judge required stock volume in the absorption tower.
2. when the content of the former sulfur dioxide in flue gas of boiler is in design load, by the control of control module, by the required lime stone slurry of supply in the flow inlet Lu Yixiang absorption tower to motor regulated valve and butterfly valve one.Flow inlet road two is in closed condition at this moment.
3. when boiler uses high-sulfur coal and causes sulfur dioxide in flue gas content to surpass design load, by the valve opening of control module comprehensive adjustment motor regulated valve, butterfly valve one and butterfly valve two.The stable slurries quantity delivered that increases makes absorption tower adaptation condition stable operation.
The present invention is owing to adopt said structure and method, by control module and two flow inlet roads, can satisfy the absorption tower the design load 30%～200% between change, satisfy requirement to different lime slurries amount.Variation to ature of coal has splendid adaptive capacity, can guarantee the stable operation of system.The present invention is not only applicable to newly-built desulfurizer, and is applicable to that power plant has built the project reconstruction of desulfurizer.
The present invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is apparatus of the present invention structural representation;
Fig. 2 is a control flow chart of the present invention.
The specific embodiment
Referring to Fig. 1, desulfurizer of the present invention comprises band spraying layer 2, the slurry circulating pump 11 that forms self-loopa and the absorption tower 1 of gypsum excavationg pump 12, the lime stone slurry case 9 of band lime stone slurry densitometer 8 and lime stone slurry rear pump 10.Lime stone slurry rear pump 10 is communicated with the bottom of lime stone slurry case 9 with absorption tower 1 by slurry flow meter 7 and slurries transfer pipeline.The slurries transfer pipeline is to be composed in parallel by flow inlet road one A and flow inlet road two B.Be serially connected with motor regulated valve 3 and butterfly valve 1 on one A of flow inlet road, be serially connected with hand-operated valve 5 and butterfly valve 26 on two B of flow inlet road, motor regulated valve 3, butterfly valve 1 and butterfly valve 26 all can be realized automatic control.
Referring to Fig. 2, the control method step of apparatus of the present invention is:
1. by the sulfur dioxide removal efficient of control module, revise the pH value of slurries in the absorption tower 1 according to former sulfur dioxide in flue gas concentration, calcium sulfur ratio, liquid-gas ratio and needs.Lime stone slurry density and flow rate calculation lime stone slurry with lime stone slurry case 9 consume, and judge required stock volume in the absorption tower 1.
2. when the content of the former sulfur dioxide in flue gas of boiler is in design load, calculate the lime stone slurry consumption by control module, if consumption is less than single tube road stock volume then control the valve opening of motor regulated valve 3 and butterfly valve 1, supply required lime stone slurry by flow inlet road one A in absorption tower 1, this moment, flow inlet road two B were in closed condition.
3. when boiler uses high-sulfur coal and causes sulfur dioxide in flue gas content to surpass design load, by the valve opening of control module comprehensive adjustment motor regulated valve 3, butterfly valve 1 and butterfly valve 26, in absorption tower 1, supply required lime stone slurry jointly by flow inlet road one A and flow inlet road two B.The stable slurries quantity delivered that increases makes absorption tower 1 adaptation condition stable operation.
Claims (2)
1. the desulfurizer that adapts to the sulfur dioxide concentration large-scope change, it comprises band spraying layer (2), form the slurry circulating pump (11) of self-loopa and the absorption tower (1) of gypsum excavationg pump (12), the lime stone slurry case (9) of band lime stone slurry densitometer (8) and lime stone slurry rear pump (10), lime stone slurry rear pump (10) is communicated with the bottom of lime stone slurry case (9) with absorption tower (1) by slurry flow meter (7) and slurries transfer pipeline, it is characterized in that, described slurries transfer pipeline is to be composed in parallel by flow inlet road one (A) and flow inlet road two (B), be serially connected with motor regulated valve (3) and butterfly valve one (4) on the flow inlet road one (A), be serially connected with hand-operated valve (5) and butterfly valve two (6) on the flow inlet road two (B), motor regulated valve (3), butterfly valve one (4) and butterfly valve two (6) all can be realized automatic control.
2. realize the control method of the desulfurizer of adaptation sulfur dioxide concentration large-scope change as claimed in claim 1, its key step is:
1. by the sulfur dioxide removal efficient of control module according to former sulfur dioxide in flue gas concentration, calcium sulfur ratio, liquid-gas ratio and needs, revise the pH value of the interior slurries in absorption tower (1), lime stone slurry density and flow rate calculation lime stone slurry with lime stone slurry case (9) consume, and judge required stock volume in the absorption tower (1);
2. when the content of the former sulfur dioxide in flue gas of boiler is in design load, by the control of control module to motor regulated valve (3) and butterfly valve one (4), supply required lime stone slurry by flow inlet road one (A) in absorption tower (1), this moment, flow inlet road two (B) were in closed condition;
3. when boiler uses high-sulfur coal and causes sulfur dioxide in flue gas content to surpass design load, valve opening by control module comprehensive adjustment motor regulated valve (3), butterfly valve one (4) and butterfly valve two (6), the stable slurries quantity delivered that increases makes absorption tower (1) adaptation condition stable operation.
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| CN200710304066XA CN101468288B (en) | 2007-12-24 | 2007-12-24 | Desulfurizer suitable for sulfuric dioxide of large-scope change and control method thereof |
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| CN200710304066XA CN101468288B (en) | 2007-12-24 | 2007-12-24 | Desulfurizer suitable for sulfuric dioxide of large-scope change and control method thereof |
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| CN101468288B true CN101468288B (en) | 2011-09-07 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101732976B (en) * | 2009-12-31 | 2012-06-20 | 中电投远达环保工程有限公司 | Method for improving quality of desulphurization gypsum in flue gas desulfurization process and flue gas desulfurization system |
| CN101961600A (en) * | 2010-08-16 | 2011-02-02 | 中环（中国）工程有限公司 | Redundancy design-based limestone slurry supplying device |
| CN106731635A (en) * | 2017-01-20 | 2017-05-31 | 上海龙净环保科技工程有限公司 | The method and control system of control fume desulfurizing agent supply |
| CN107185387A (en) * | 2017-07-21 | 2017-09-22 | 江苏绿都环境工程有限公司 | It is a kind of that there is the high-efficiency desulfurization equipment for automatically adjusting concentration of slurry function |
| CN109126408B (en) * | 2018-08-23 | 2024-04-16 | 南京天创电子技术有限公司 | Wet desulfurization device and intelligent control method |
| CN113731149A (en) * | 2021-08-27 | 2021-12-03 | 华能南京金陵发电有限公司 | Wet desulphurization control method and device |
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| CN2355776Y (en) * | 1999-01-15 | 1999-12-29 | 重庆钢铁设计研究院 | Purifier for compressed air |
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| JP2006119968A (en) * | 2004-10-22 | 2006-05-11 | Ishikawajima Harima Heavy Ind Co Ltd | Duplex automatic switching control device for fluid distribution line |
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