CN101658760A - Flue gas desulfurization technology applicable to calcium and magnesium desulfuraters - Google Patents
Flue gas desulfurization technology applicable to calcium and magnesium desulfuraters Download PDFInfo
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- CN101658760A CN101658760A CN200910092534A CN200910092534A CN101658760A CN 101658760 A CN101658760 A CN 101658760A CN 200910092534 A CN200910092534 A CN 200910092534A CN 200910092534 A CN200910092534 A CN 200910092534A CN 101658760 A CN101658760 A CN 101658760A
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Abstract
The invention discloses a flue gas desulfurization technology applicable to calcium and magnesium desulfuraters, which comprises flue gas purification, desulfurater preparation, flue gas desulfurization, a combined tank, a dewatering system and a water purification system and is characterized in that the flue gas purification adopts an independent spray type flue gas purification tower; the desulfurater preparation takes calcium oxide or magnesium oxide as the desulfurater; the flue gas desulfurization adopts a three-layer spray system; and serosity absorbing sulfur dioxide enters a combined tank through self-flowing. The combined tank is internally provided with an oxidization area, a crystallization area and a precipitation area. When taking calcium oxide as the desulfurater, the main component of the by-product after dehydration is plaster; and when taking magnesium oxide as the desulfurater, fertilizers products such as magnesium sulfate or magnesium sulfite can be obtained. The flue gas desulfurization technology has the beneficial effect that the design of the multifunctional combined tank realizes the use of the calcium and magnesium desulfuraters in one set of process system, thus improving the degree of freedom and selectivity of the operation of the desulfurization system. The flue gas desulfurization technology is applicable to calcium and magnesium desulfuraters.
Description
Technical field
The invention belongs to the boiler flue gas desulfurization purified treatment, particularly a kind of flue gas desulfurization technique that is applicable to calcium and magnesium desulfuraters.
Background technology
Thermal power plant's Industrial Boiler discharged flue gas contains SO
2, very serious to the pollution of environment.Along with the increasing of China environmental protection dynamics, flue gas desulfurization technique is applied at home and develops.At present, in the flue gas desulfurization field, the wet flue gas desulfurization technology obtains promotion and application widely.Wet flue gas desulfurization, the difference by using desulfurizing agent is divided into calcium oxide wet type desulfurizing and magnesia wet type desulfurizing.Because the desulfurizing agent difference of using, technology separately be difference to some extent also, makes that the free degree of desulphurization system operation is low, can not suit measures to local conditions, stablize with suiting measures to differing conditions in terms of time long-time running; When the purification of flue gas is all carried out, make that desulfuration efficiency, impurity-eliminating effect and byproduct quality can not get guaranteeing in desulfurizing tower.
Summary of the invention
The objective of the invention is, design and a kind of gas cleaning and flue gas desulfurization are separately carried out, obtain removal of impurities cleaning and desulfurization slurries efficiently, carry out the compatibility design at the rerum natura characteristics of difference, intermediate product and the accessory substance of calcium and magnesium desulfuraters, make this technology freely to replace and use calcium oxide or magnesia desulfurizing agent, can make the operation of system's long-term stability.
The present invention realizes that the technical scheme that above-mentioned purpose adopts is, a kind of flue gas desulfurization technique that is applicable to calcium and magnesium desulfuraters, by gas cleaning, the desulfurizing agent preparation, flue gas desulfurization, comprehensive pond, dewatering system, water purification system is formed, after flue gas preliminary purification and two kinds of desulfurizing agents prepare, send into fume desulfurizing tower, after flue gas desulfurization, send into comprehensive pond, when adopting the calcium oxide desulfurizing agent, become the gypsum preparation system through dewatering system, when adopting the magnesia desulfurizing agent, through water purification system and evaporative crystallization, centrifugal drying, become the epsom salt preparation system, or become the magnesium sulfite preparation system through dewatering system.
Aforesaid gas cleaning, adopt independent fountain column for smoke purification, after flue gas boosts by booster fan, enter into column for smoke purification, spray header and turbulent flow generator are set in purifying column, improve the gas-liquid mass transfer effect by clear water spray and turbulent flow, make spray liquid can remove the impurity such as chlorine, fluorine and dust that contain band in the flue gas effectively, clearance can reach 98%, 98% and 50%.Flue gas obtains preliminary purification, to promote the quality of desulfurizing byproduct.
Aforesaid desulfurizing agent preparation, use calcium oxide (90% purity) or magnesia (85% purity) as desulfurizing agent, all adopt dilution, slaking and three assembled units of supply to prepare, can improve the activity of desulfurizing agent, remove wherein partial impurities, the concentration of slurries is regulated by control slurrying rate of water make-up, and concentration of slurry is formulated as 10%.
Aforesaid flue gas desulfurization, the flue gas after the preliminary purification enters desulfurizing tower through after dewatering, and three layers of spray equipment are set in desulfurizing tower, and wherein two-layer is the low discharge spraying layer, and one deck is big flow spraying layer.The use of three layers of spraying layer is adjusted according to the flue gas work condition state, standby each other and regulating measure, to realize effective liquid-gas ratio of calcium and magnesium desulfuraters, both during the calcium oxide desulfurizing agent, liquid-gas ratio is 6, and during the magnesia desulfurizing agent, liquid-gas ratio is 12, the slurries that absorbed sulfur dioxide enter comprehensive pond by gravity flow after density reaches required value (1100kg/L).
Aforesaid comprehensive pond, the rectangle pond body that has the inclination angle for the bottom, be provided with oxide regions, crystal region and precipitation zone in the pond from top to bottom, oxide regions is provided with two-layer aerator, lower floor is for forcing aeration, promptly blast a large amount of oxidation airs, play oxidation and stirring action by oxidation fan; The upper strata is the micropore surface aeration, promptly adopted the aerator of aeration head, play the effect that improves catalyst mix effect and oxygenation efficiency, the crystal region of oxide regions bottom is for preventing have the incrustation of " central island " type to occur at the bottom of the pond, be provided with the plug-flow agitator, behind accessory substance crystallization and the contamination precipitation that can not be oxidized, be collected to precipitation zone, comprehensive pond cuts off clean solution tank, the slurries on top are squeezed into the desulfurizing tower spray equipment by circulating pump, absorb sulfur dioxide by circulation.
Aforesaid gypsum preparation system, when using calcium oxide as desulfurizing agent, with the accessory substance crystallization in comprehensive pond and contamination precipitation thing that can not be oxidized, deliver to dewatering system by slush pump and carry out processed, dehydration back accessory substance main component is a gypsum, water content is 10%, and after the recirculation water that dewatering system produces purifies by water purification system, qualified discharge.
Aforesaid epsom salt preparation system, when using magnesia as desulfurizing agent, upper strata micro-pore aeration operation, comprehensive pond cuts off clean solution tank, and the clear liquid magnesium sulfate concentration of overflow can reach 27%, delivers to water purification system afterwards, enter the magnesium sulfate production system again, by operations such as evaporation and concentration, crystallisation by cooling, centrifugal drying and packings, obtain fertilizer product, promptly purity is greater than 95% epsom salt product.
Aforesaid magnesium sulfite preparation system, when using magnesia as desulfurizing agent, the upper strata micro-pore aeration in comprehensive pond is stopped transport, the pressure aeration of lower floor also stops, open bottom plug-flow agitator, the accessory substance that produces mainly is the magnesium sulfite of the generation absorption tower in, and its main component is the impurity in the magnesia and the mixture of magnesium sulfite.Deliver to dewatering system by slush pump again and carry out processed, dehydration back accessory substance main component is a magnesium sulfite, and water content is 15%, and after the recirculation water that dewatering system produces purifies by water purification system, qualified discharge.
The invention has the beneficial effects as follows that the design in multifunctional comprehensive pond has realized the alternative use of calcium magnesium desulfurizer at same set of process system, improved the free degree and the selectivity of desulphurization system operation; Gas cleaning is divided into Impurity removal and sulfur dioxide two stages of absorption, has improved removal efficient; At purifying column strong corrosive materials such as chlorine in the flue gas and fluorine are removed, made it not enter desulfurizing tower, improved the stable operation reliability of desulfurizing tower; With the Impurity removals such as dust in the flue gas, improved the accessory substance quality at purifying column; The wastewater treatment of calcium oxide method desulfurization and the mother liquor purification technology of magnesium oxide method are unified, have improved system's operational reliability and flexibility ratio.Be applicable to the flue gas desulfurization technique of calcium and magnesium desulfuraters.
Description of drawings
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is a kind of process chart that is applicable to the flue gas desulfurization technique of calcium and magnesium desulfuraters of the present invention
Fig. 2 is a kind of comprehensive pond organigram that is applicable to the flue gas desulfurization technique of calcium and magnesium desulfuraters of the present invention
Among the figure, the 1-column for smoke purification, the 2-fume desulfurizing tower, the preparation of 3-desulfurizing agent, the 4-dewatering system, the comprehensive pond of 5-, the 6-water purification system, the 7-evaporative crystallization, the 8-centrifugal drying,
Pond, the comprehensive pond of 11-body, the 12-oxide regions, the 13-crystal region, the 14-precipitation zone, 15-forces aeration, 16-micropore surface aeration, 17-plug-flow agitator, 18-cuts off
The specific embodiment
As seen from Figure 1, a kind of flue gas desulfurization technique that is applicable to calcium and magnesium desulfuraters, by gas cleaning, the desulfurizing agent preparation, flue gas desulfurization, comprehensive pond, dewatering system, water purification system is formed, flue gas is after column for smoke purification 1 preliminary purification and two kinds of desulfurizing agents preparation 3, send into fume desulfurizing tower 2, after flue gas desulfurization, send into comprehensive pond 5, when adopting the calcium oxide desulfurizing agent, become the gypsum preparation system through dewatering system 4, when adopting the magnesia desulfurizing agent, through water purification system 6 and evaporative crystallization 7, centrifugal drying 8, become the epsom salt preparation system, or become the magnesium sulfite preparation system through dewatering system 4.
Gas cleaning, adopt independent fountain column for smoke purification 1, after flue gas boosts by booster fan, enter into column for smoke purification, spray header and turbulent flow generator are set in purifying column, improve the gas-liquid mass transfer effect, make spray liquid can remove the impurity such as chlorine, fluorine and dust that contain band in the flue gas effectively by clear water spray and turbulent flow, flue gas obtains preliminary purification, to promote the quality of desulfurizing byproduct.
Desulfurizing agent preparation 3 uses calcium oxide or magnesia as desulfurizing agent, all adopts dilution, slaking and three assembled units of supply to prepare, can improve the activity of desulfurizing agent, remove wherein partial impurities, the concentration of slurries is regulated by control slurrying rate of water make-up, and concentration of slurry is formulated as 10%.
Flue gas desulfurization, the flue gas after the preliminary purification enters desulfurizing tower 2 through after dewatering, and three layers of spray equipment are set in desulfurizing tower, and wherein two-layer is the low discharge spraying layer, and one deck is big flow spraying layer.The use of three layers of spraying layer is adjusted according to the flue gas work condition state, and standby each other and regulating measure to realize effective liquid-gas ratio of calcium and magnesium desulfuraters, both had been respectively 6 and 12 liquid-gas ratio, and the slurries that absorbed sulfur dioxide enter comprehensive pond by gravity flow.
The gypsum preparation system, when using calcium oxide as desulfurizing agent, with the accessory substance crystallization in comprehensive pond and contamination precipitation thing that can not be oxidized, deliver to dewatering system 4 by slush pump and carry out processed, dehydration back accessory substance main component is a gypsum, water content is 10%, and after the recirculation water that dewatering system produces purifies by water purification system, qualified discharge.
The epsom salt preparation system, when using magnesia as desulfurizing agent, 16 operations of upper strata micro-pore aeration, comprehensive pond cuts off 18 clean solution tank 19, the clear liquid pump of overflow is delivered to water purification system 6, by operations such as evaporation and concentration, crystallisation by cooling 7, centrifugal drying 8 and packings, obtain the fertilizer product epsom salt again.
The magnesium sulfite preparation system, when using magnesia as desulfurizing agent, the upper strata micro-pore aeration 16 in comprehensive pond is stopped transport, the pressure aeration 15 of lower floor also stops, open bottom plug-flow agitator 17, the accessory substance that produces mainly is the magnesium sulfite of the generation absorption tower in, and its main component is the impurity in the magnesia and the mixture of magnesium sulfite.Deliver to dewatering system 4 by slush pump again and carry out processed, dehydration back accessory substance main component is a magnesium sulfite, and water content is 15%, and after the recirculation water that dewatering system produces purifies by water purification system 6, qualified discharge.
As seen from Figure 2, comprehensive pond is the rectangle pond body 11 that the bottom has the inclination angle, is provided with oxide regions 12, crystal region 13 and precipitation zone 14 in the pond, and oxide regions is provided with two-layer aerator, and oxidation and stirring action play for forcing aeration 15 in lower floor; The upper strata is a micropore surface aeration 16, play the effect that improves catalyst mix effect and oxygenation efficiency, the crystal region of oxide regions bottom, for preventing have the incrustation of " central island " type to occur at the bottom of the pond, be provided with plug-flow agitator 17, behind accessory substance crystallization and the contamination precipitation that can not be oxidized, be collected to precipitation zone.Comprehensive pond cuts off 18 clean solution tank, and the slurries on top are squeezed into the desulfurizing tower spray equipment by circulating pump, absorbs sulfur dioxide by circulation.
Claims (10)
1, a kind of flue gas desulfurization technique that is applicable to calcium and magnesium desulfuraters, form by gas cleaning, desulfurizing agent preparation, flue gas desulfurization, comprehensive pond, dewatering system, water purification system, it is characterized in that, after flue gas preliminary purification and two kinds of desulfurizing agents prepare, send into fume desulfurizing tower, after flue gas desulfurization, send into comprehensive pond, when adopting the calcium oxide desulfurizing agent, become the gypsum preparation system through dewatering system.
2, a kind of flue gas desulfurization technique that is applicable to calcium and magnesium desulfuraters as claimed in claim 1 is characterized in that, when adopting the magnesia desulfurizing agent, through water purification system and evaporative crystallization, centrifugal drying, becomes the epsom salt preparation system.
3, a kind of flue gas desulfurization technique that is applicable to calcium and magnesium desulfuraters as claimed in claim 1 is characterized in that, when adopting the magnesia desulfurizing agent, becomes the magnesium sulfite preparation system through dewatering system.
4, as claim 1,2 or 3 described a kind of flue gas desulfurization techniques that are applicable to calcium and magnesium desulfuraters, it is characterized in that, gas cleaning, adopt independent fountain column for smoke purification, spray header and turbulent flow generator are set in purifying column, improve the gas-liquid mass transfer effect by clear water spray and turbulent flow, make spray liquid can remove the impurity such as chlorine, fluorine and dust that contain band in the flue gas effectively, flue gas obtains preliminary purification.
5, as claim 1,2 or 3 described a kind of flue gas desulfurization techniques that are applicable to calcium and magnesium desulfuraters, it is characterized in that, the desulfurizing agent preparation, adopt dilution, slaking and three assembled units of supply to prepare, the concentration of slurries is regulated by control slurrying rate of water make-up, and concentration of slurry is formulated as 10%.
6, as claim 1,2 or 3 described a kind of flue gas desulfurization techniques that are applicable to calcium and magnesium desulfuraters, it is characterized in that, flue gas desulfurization, flue gas after the preliminary purification is through after dewatering, enter desulfurizing tower, three layers of spray equipment are set in desulfurizing tower, and wherein two-layer is the low discharge spraying layer, and one deck is big flow spraying layer.The use of three layers of spraying layer is adjusted according to the flue gas work condition state, standby each other and regulating measure, and to realize effective liquid-gas ratio of calcium and magnesium desulfuraters, the slurries that absorbed sulfur dioxide enter comprehensive pond by gravity flow.
7, as claim 1,2 or 3 described a kind of flue gas desulfurization techniques that are applicable to calcium and magnesium desulfuraters, it is characterized in that, comprehensive pond is the rectangle pond body that the bottom has the inclination angle, be provided with oxide regions, crystal region and precipitation zone in the pond, oxide regions is provided with two-layer aerator, oxidation and stirring action play for forcing aeration in lower floor; The upper strata is the micropore surface aeration, play the effect that improves catalyst mix effect and oxygenation efficiency, the crystal region of oxide regions bottom, for the incrustation that prevents to have at the bottom of the pond " central island " type occurs, be provided with the plug-flow agitator, behind accessory substance crystallization and the contamination precipitation that can not be oxidized, be collected to precipitation zone, comprehensive pond cuts off clean solution tank, and the slurries on top are squeezed into the desulfurizing tower spray equipment by circulating pump, absorbs sulfur dioxide by circulation.
8, a kind of flue gas desulfurization technique that is applicable to calcium and magnesium desulfuraters as claimed in claim 1, it is characterized in that, the gypsum preparation system, with the accessory substance crystallization in comprehensive pond and contamination precipitation thing that can not be oxidized, deliver to dewatering system by slush pump and carry out processed, dehydration back accessory substance main component is a gypsum, and after the recirculation water that dewatering system produces purifies by water purification system, qualified discharge.
9, a kind of flue gas desulfurization technique that is applicable to calcium and magnesium desulfuraters as claimed in claim 2, it is characterized in that, the epsom salt preparation system, the micro-pore aeration operation of comprehensive upper strata, pond, comprehensive pond cuts off clean solution tank, and the clear liquid pump of overflow is delivered to water purification system, enters the magnesium sulfate production system again, by operations such as evaporation and concentration, crystallisation by cooling, centrifugal drying and packings, obtain the fertilizer product epsom salt.
10, a kind of flue gas desulfurization technique that is applicable to calcium and magnesium desulfuraters as claimed in claim 3, it is characterized in that, the magnesium sulfite preparation system, the upper strata micro-pore aeration in comprehensive pond is stopped transport, the pressure aeration of lower floor also stops, open bottom plug-flow agitator, the accessory substance that produces mainly is the magnesium sulfite that produces in the absorption tower, its main component is the impurity in the magnesia and the mixture of magnesium sulfite: deliver to dewatering system by slush pump again and carry out processed, dehydration back accessory substance main component is a magnesium sulfite, water content is 15%, and after the recirculation water that dewatering system produces purifies by water purification system, qualified discharge.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102886199A (en) * | 2012-10-26 | 2013-01-23 | 煤炭工业济南设计研究院有限公司 | Flue gas desulfurization device and desulfurization method by magnesium oxide process |
| CN103566732A (en) * | 2012-07-31 | 2014-02-12 | 陈志军 | Alkaline-method wet-type desulfurization denitration technology and device |
| CN103785286A (en) * | 2014-02-17 | 2014-05-14 | 佛山市三叶环保设备工程有限公司 | Magnesium type flue gas desulfurization process for recovering magnesium sulfate heptahydrate |
| CN103801177A (en) * | 2014-01-27 | 2014-05-21 | 浙江大学 | Flue gas treatment method for simultaneous desulfurization, denitrification and demercuration by calcium and magnesium method |
| CN104107628A (en) * | 2014-07-10 | 2014-10-22 | 中国神华能源股份有限公司 | Flue gas desulfurization equipment and method thereof |
| CN108176215A (en) * | 2017-12-20 | 2018-06-19 | 张家港燎原环保科技有限公司 | Alkali desulphurization system |
Family Cites Families (3)
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| CN2629812Y (en) * | 2002-10-22 | 2004-08-04 | 熊天渝 | Magnesium-adding lime-limestnoe washing apparatus for removing sulfur dioxide and producing gypsum |
| CN100335154C (en) * | 2005-09-09 | 2007-09-05 | 清华大学 | Magnesium oxide flue gas desulfurization and outgrowth thick-slurry method oxidation reclaim process |
| CN101444699B (en) * | 2008-12-16 | 2011-04-13 | 刘存宝 | Technical method for removing sulfur dioxide in flue gas by using sodium sulfite and equipment thereof |
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- 2009-09-17 CN CN200910092534A patent/CN101658760B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103566732A (en) * | 2012-07-31 | 2014-02-12 | 陈志军 | Alkaline-method wet-type desulfurization denitration technology and device |
| CN102886199A (en) * | 2012-10-26 | 2013-01-23 | 煤炭工业济南设计研究院有限公司 | Flue gas desulfurization device and desulfurization method by magnesium oxide process |
| CN102886199B (en) * | 2012-10-26 | 2015-03-04 | 煤炭工业济南设计研究院有限公司 | Flue gas desulfurization device and desulfurization method by magnesium oxide process |
| CN103801177A (en) * | 2014-01-27 | 2014-05-21 | 浙江大学 | Flue gas treatment method for simultaneous desulfurization, denitrification and demercuration by calcium and magnesium method |
| CN103801177B (en) * | 2014-01-27 | 2016-04-06 | 浙江大学 | A kind of flue gas processing method of calcium magnesium processes simultaneous SO_2 and NO removal demercuration |
| CN103785286A (en) * | 2014-02-17 | 2014-05-14 | 佛山市三叶环保设备工程有限公司 | Magnesium type flue gas desulfurization process for recovering magnesium sulfate heptahydrate |
| CN104107628A (en) * | 2014-07-10 | 2014-10-22 | 中国神华能源股份有限公司 | Flue gas desulfurization equipment and method thereof |
| CN104107628B (en) * | 2014-07-10 | 2016-03-09 | 中国神华能源股份有限公司 | A kind of flue gas desulfurization device and method thereof |
| CN108176215A (en) * | 2017-12-20 | 2018-06-19 | 张家港燎原环保科技有限公司 | Alkali desulphurization system |
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