CN102794092A - Fire coal flue gas wet method energy-saving desulfurization method - Google Patents
Fire coal flue gas wet method energy-saving desulfurization method Download PDFInfo
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- CN102794092A CN102794092A CN2012102540838A CN201210254083A CN102794092A CN 102794092 A CN102794092 A CN 102794092A CN 2012102540838 A CN2012102540838 A CN 2012102540838A CN 201210254083 A CN201210254083 A CN 201210254083A CN 102794092 A CN102794092 A CN 102794092A
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Abstract
The invention provides a fire coal flue gas wet method energy-saving desulfurization method, and belongs to the technical field of recycle methods of fire coal flue gas. The method comprises the following steps of: firstly, homogenizing a desulfurizing agent and fire coal, transporting into a hearth for combustion, generating various chemical compounds by SO2 generated by the combustion reaction and elements in furnace burden, and discharging the chemical compounds and the furnace burden which is not completely reacted out from the hearth along with furnace slag; absorbing dust in the flue gas and entering a spray tower, and washing the flue gas by an alkaline wash solution for desulfuration; leading discharged wash solution water body to flow into an oxidation pond, discharging to a slag bath along with discharged materials of the hearth, dissolving water-soluble substances discharged out from the hearth by slag washing water body, hydrolyzing to obtain alkaline liquor, carrying out a reaction between sulfuric acid and hydrochloride solutes in the alkaline liquor to generate ocyhydrate precipitates, and jointly taking away by absorbing of the furnace slag; and leading the reacted alkaline liquor to enter a filter tank, pumping into the spray tower after filtering, and circularly washing the flue gas. A desulfurization system used by the invention is simple, the use level of the fire coal can be saved, sewage does not need to be discharged outwards and secondary pollutants can not be additionally discharged in the whole process, the running cost can be reduced, and the desulfuration and the smoke dust treatment can reach the standard.
Description
Technical field
The present invention relates to a kind of coal-fired flue-gas recoverying and utilizing method, relate to a kind of coal-fired flue-gas wet method energy-saving desulfuration method specifically.
Background technology
At present, the coal-fired flue gas desulfurization method adopts limestone-gypsum wet method (FGD) to carry out desulfurization more, with the dedusting of moisture film dust collecting process.The FGD desulfurizer comprises that limestone slurry liquid preparing system, absorption tower system, gypsum dehydration system, Waste Water Treatment reach supporting with it power set and spray column system etc.This FGD desulfurizer desulfurization is not enough; Complex structure, production cost, operation, maintenance cost height; Also need purchase related raw materials such as limestone/lime, improve production cost; Discharged flue gas still has pollution to atmosphere; Need give off a large amount of sewage, contaminated environment, and waste water resource.
Existing a kind of name is called the patent (patent No. is 200610054388.9) of " energy saving desulfurizer for bunker coal ", and it mainly solves coal fire discharged problem, and it can carry out desulfurization effectively, can reduce the problem of coal-fired use amount simultaneously again.The applicant combines this patent to carry out comprehensive Design, thereby further solves the coal desulfurization problem.
Summary of the invention
The purpose of this invention is to provide a kind of coal-fired flue-gas wet method energy-saving desulfuration method; The desulphurization system of its use is simple, can practice thrift coal-fired use amount in the sweetening process; Whole sweetening process is not sewage effluent, not newly-increased secondary pollution discharging externally; The operating cost of desulphurization system reduces, and desulfurization, to administer flue dust up to standard.
In order to realize such scheme, technical solution of the present invention is: a kind of coal-fired flue-gas wet method energy-saving desulfuration method, it comprises the steps:
(1) energy saving desulfurizer for bunker coal and coal-fired homogenizing are together sent in boiler of power plant or all types of industries stove burnt, the interaction through gas, liquid media implementation chemical reaction, physical absorption in combustion process, the SO that combustion reaction in the burner hearth is generated
2Transform the multiple different compounds that generation comprises multiple soluble sulphate with the element in the furnace charge, the most furnace charge of these compounds and unreacted is discharged burner hearth with slag;
The flue gas of (2) from boiler of power plant or all types of industries stove, discharging is collected discharge through dust-precipitator with dust in flue gas, and remaining flue gas gets in the spray column, and spray has alkaline flushing liquor in the spray column, and alkaline flushing liquor is with the SO in these flue gases
2Gas, a spot of SO
3The compound of the heavy metal of gas, micronic dust and minute quantity, absorption reaction generate corresponding soluble sulphate Barbiturates, and the insoluble suspended particulate of minute quantity is like CaSO
4Deng the SiO maximum with accounting for content in the flying dust
2, a spot of acidic oxide dust is then with solid phase slag mud form, flows out realization flue gas desulfurization naturally with the flushing liquor water body of accomplishing behind the washing flue gas;
(3) the flushing liquor water body that flows out from the spray column bottom flows into oxidation pond; After oxidation pond oxygenation activation; Be pumped to the flushing cinder mouth of boiler of power plant or all types of industries stove; The most furnace charge and the slag of compound, unreacted of discharging with burner hearth together drains into slag bath, owing in the burner hearth combustion process, added energy saving desulfurizer for bunker coal, making the soluble component in the slag is that master, several kinds of both sexes and metal acidic oxide, sulfuric acid, hydrochloric acid salt solute mix composition with solubility alkalescence oxide, the alkali salt class that generates mainly; The flushing cinder water body is behind these water-soluble substanceses of slag bath dissolving; Obtain the alkali lye after the solable matter hydrolysis, the sulfuric acid in this alkali lye, hydrochloric acid salt solute are like PbSO
4, CdSO
4, Cr
2(SO
4)
3Generate precipitation of hydroxide Deng heavy metallic salt and small amount of Fe, the reaction of Al metal ion, by slag absorption, take away jointly through dragging for slag;
(4) the reacted alkali lye of above-mentioned steps (3) gets in the filtering ponds, and the alkali lye after filtering or clarifying is pumped in the spray column, and circulation cleaning gets into the flue gas in the spray column.
Coal-fired flue-gas wet method energy-saving desulfuration method of the present invention, wherein the amount of putting into of the energy saving desulfurizer for bunker coal in the step (1) is gone into the control of stove amount controller by furnace charge, and said furnace charge is gone into the stove amount controller and is connected with the control system.
Coal-fired flue-gas wet method energy-saving desulfuration method of the present invention, wherein the alkaline flushing liquor in the step (2) is the alkaline water body in the step (4), its pH value is 9-13.5.
Coal-fired flue-gas wet method energy-saving desulfuration method of the present invention, wherein the pH value through the flushing water body after the oxygenation activation in the oxidation pond is 6-6.5 in the step (3).
Coal-fired flue-gas wet method energy-saving desulfuration method of the present invention, wherein the filtering ponds inner chamber pH value Intelligent Measure and Control Instrument in the step (4) is communicated with, and said pH value Intelligent Measure and Control Instrument is connected with the control system.
After adopting such scheme; Through with energy saving desulfurizer for bunker coal and fire coal is together put into boiler of power plant or all types of industries stove burns, this step can be accomplished the active desulfurization in the burner hearth, solid sulphur 50%-60% to coal-fired flue-gas wet method energy-saving desulfuration method of the present invention in step (1); The SO that from the flue gas that burner hearth is discharged, contains 40%-50% afterwards through step (2)
2, these flue gases get into the interior and alkaline flushing liquor neutralization of spray column, oxidation after the dust-precipitator dedusting, and flue gas is washed, and this moment can be with the SO that contains remaining 40%-50% in the flue gas
2Gas sweetening is more than 95%, and with a spot of SO in the flue gas
3The compound of the heavy metal of gas, micronic dust and minute quantity, absorption reaction generate corresponding soluble sulphate Barbiturates, and the insoluble suspended particulate of minute quantity is like CaSO
4Deng the SiO maximum with accounting for content in the flying dust
2, a spot of acidic oxide dust is then with solid phase slag mud form; Flushing liquor water body with behind the completion washing flue gas flows out naturally; Realize flue gas desulfurization, and the slag of from boiler furnace, discharging, unreacted furnace charge and comprise that the multiple different compounds of multiple soluble sulphate and flushing liquor water body after oxidation pond oxygenation activation together flow into the slag bath afterreaction to the greatest extent, obtain the alkali lye after the solable matter hydrolysis; Sulfuric acid in this alkali lye, hydrochloric acid salt solute are like PbSO
4, CdSO
4, Cr
2(SO
4)
3Generate precipitation of hydroxide Deng heavy metallic salt and small amount of Fe, the reaction of Al metal ion, by slag absorption, take away jointly through dragging for slag; And alkali lye gets in the filtering ponds, washs flue gas in pump to the spray column through filtering to be recycled, and the desulphurization system of using in this method is simple, use energy saving desulfurizer for bunker coal and fire coal to go into companion's burning in boiler of power plant or all types of industries stove in the sweetening process; Can practice thrift coal-fired use amount, whole sweetening process is sewage effluent not externally, only discharges slag; Environment is not polluted; Newly-increased secondary pollution discharging, the operating cost of desulphurization system reduces, and desulfurization, to administer flue dust up to standard.
Description of drawings
Fig. 1 is the process chart of coal-fired flue-gas wet method energy-saving desulfuration method of the present invention.
The specific embodiment
In conjunction with shown in Figure 1, coal-fired flue-gas wet method energy-saving desulfuration method of the present invention may further comprise the steps:
(1) energy saving desulfurizer for bunker coal and coal-fired homogenizing are together sent into burning in boiler of power plant or all types of industries stove 1; The amount of putting into of energy saving desulfurizer for bunker coal is gone into 4 controls of stove amount controller by furnace charge; Furnace charge is gone into stove amount controller 4 and is connected with the control system; The amount of putting into of energy saving desulfurizer for bunker coal is passed through the interaction of gas, liquid media implementation chemical reaction, physical absorption fully by the control of control system in combustion process like this, with the SO of combustion reaction generation in the burner hearth
2Transform the multiple different compounds that generation comprises multiple soluble sulphate with the element in the furnace charge, the most furnace charge of these compounds and unreacted is discharged burner hearth with slag, and this process can be accomplished the active desulfurization in the burner hearth, solid sulphur 50%-60%;
The flue gas of (2) from boiler of power plant or all types of industries stove 1, discharging also contains the SO of 40%-50% in these flue gases
2, through dust-precipitator 2 dust in flue gas is collected discharge, remaining flue gas gets in the spray column 3, and it is the alkaline flushing liquor of 9-13.5 that spray column 3 interior sprays have pH value, the SO in alkaline flushing liquor and these flue gases
2Gas, a spot of SO
3The compound neutralization of the heavy metal of gas, micronic dust and minute quantity, oxidation, flue gas is washed, at this moment the SO in the flue gas
2Gas has 95% above desulfurization, and the corresponding soluble sulphate Barbiturates of reaction generation, and the insoluble suspended particulate of minute quantity is like CaSO
4Deng the SiO maximum with accounting for content in the flying dust
2, a spot of acidic oxide dust is then with solid phase slag mud form, flows out realization flue gas desulfurization naturally with the flushing liquor water body of accomplishing behind the washing flue gas;
(3) the flushing liquor water body that flows out from spray column 3 bottoms flows into oxidation pond 6; After oxidation pond 6 oxygenation activation; The pH value of flushing liquor water body is 6-6.5, and the flushing liquor water body is pumped to the flushing cinder mouth 5 of boiler of power plant or all types of industries stove 1, and the most furnace charge and the slag of compound, unreacted of discharging with burner hearth together drains into slag bath 7; Owing in the burner hearth combustion process, added energy saving desulfurizer for bunker coal; Making the soluble component in the slag is that master, several kinds of both sexes and metal acidic oxide, sulfuric acid, hydrochloric acid salt solute mix and form with solubility alkalescence oxide, the alkali salt class that generates mainly, and the flushing cinder water body obtains the alkali lye after the solable matter hydrolysis after slag bath dissolves these water-soluble substanceses; Sulfuric acid in this alkali lye, hydrochloric acid salt solute are like PbSO
4, CdSO
4, Cr
2(SO
4)
3Generate precipitation of hydroxide Deng heavy metallic salt and small amount of Fe, the reaction of Al metal ion, by slag absorption, take away jointly through dragging for slag;
(4) the reacted alkali lye of above-mentioned steps (3) gets in the filtering ponds 8; Filtering ponds 8 inner chambers are communicated with pH value Intelligent Measure and Control Instrument 9; PH value Intelligent Measure and Control Instrument 9 is connected with the control system, like this filtering ponds 8 concentration of lye by control system control, be convenient to regulate control; Alkali lye after filtering or clarifying is pumped in the spray column 3, and circulation cleaning gets into the flue gas in the spray column 3.
The desulphurization system of using in the coal-fired flue-gas wet method energy-saving desulfuration method of the present invention is simple, use energy saving desulfurizer for bunker coal and fire coal to go into companion's burning in boiler of power plant or all types of industries stove in the sweetening process; Can practice thrift coal-fired use amount, whole sweetening process is sewage effluent not externally, only discharges slag; Environment is not polluted; Newly-increased secondary pollution discharging, the operating cost of desulphurization system reduces, and desulfurization, to administer flue dust up to standard.
Compare with existing FGD wet desulphurization and sulfur method sweetening process of the present invention below in conjunction with certain 600MW power plant soot unit: new circulation desulfurization method of certain 600MW power plant soot unit and FGD doctor treatment technology material consumption energy input comparison sheet
The above embodiment describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the prerequisite of spirit not breaking away from the present invention; Various distortion and improvement that the common engineers and technicians in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (5)
1. coal-fired flue-gas wet method energy-saving desulfuration method, it comprises the steps:
(1) energy saving desulfurizer for bunker coal and coal-fired homogenizing are together sent in boiler of power plant or all types of industries stove burnt, the interaction through gas, liquid media implementation chemical reaction, physical absorption in combustion process, the SO that combustion reaction in the burner hearth is generated
2Transform the multiple different compounds that generation comprises multiple soluble sulphate with the element in the furnace charge, the most furnace charge of these compounds and unreacted is discharged burner hearth with slag;
The flue gas of (2) from boiler of power plant or all types of industries stove, discharging is collected discharge through dust-precipitator with dust in flue gas, and remaining flue gas gets in the spray column, and spray has alkaline flushing liquor in the spray column, and alkaline flushing liquor is with the SO in these flue gases
2Gas, a spot of SO
3The compound of the heavy metal of gas, micronic dust and minute quantity, absorption reaction generate corresponding soluble sulphate Barbiturates, and the insoluble suspended particulate of minute quantity is like CaSO
4Deng the SiO maximum with accounting for content in the flying dust
2, a spot of acidic oxide dust is then with solid phase slag mud form, flows out realization flue gas desulfurization naturally with the flushing liquor water body of accomplishing behind the washing flue gas;
(3) the flushing liquor water body that flows out from the spray column bottom flows into oxidation pond; After oxidation pond oxygenation activation; Be pumped to the flushing cinder mouth of boiler of power plant or all types of industries stove; The most furnace charge and the slag of compound, unreacted of discharging with burner hearth together drains into slag bath, owing in the burner hearth combustion process, added energy saving desulfurizer for bunker coal, making the soluble component in the slag is that master, several kinds of both sexes and metal acidic oxide, sulfuric acid, hydrochloric acid salt solute mix composition with solubility alkalescence oxide, the alkali salt class that generates mainly; The flushing cinder water body is behind these water-soluble substanceses of slag bath dissolving; Obtain the alkali lye after the solable matter hydrolysis, the sulfuric acid in this alkali lye, hydrochloric acid salt solute are like PbSO
4, CdSO
4, Cr
2(SO
4)
3Generate precipitation of hydroxide Deng heavy metallic salt and small amount of Fe, the reaction of Al metal ion, by slag absorption, take away jointly through dragging for slag;
(4) the reacted alkali lye of above-mentioned steps (3) gets in the filtering ponds, and the alkali lye after filtering or clarifying is pumped in the spray column, and circulation cleaning gets into the flue gas in the spray column.
2. coal-fired flue-gas wet method energy-saving desulfuration method as claimed in claim 1 is characterized in that: the amount of putting into of the energy saving desulfurizer for bunker coal in the step (1) is gone into the control of stove amount controller by furnace charge, and said furnace charge is gone into the stove amount controller and is connected with the control system.
3. coal-fired flue-gas wet method energy-saving desulfuration method as claimed in claim 1 is characterized in that: the alkaline flushing liquor in the step (2) is the alkaline water body in the step (4), and its pH value is 9-13.5.
4. coal-fired flue-gas wet method energy-saving desulfuration method as claimed in claim 1 is characterized in that: the pH value through the flushing water body after the oxygenation activation in the oxidation pond in the step (3) is 6-6.5.
5. coal-fired flue-gas wet method energy-saving desulfuration method as claimed in claim 1 is characterized in that: the filtering ponds inner chamber pH value Intelligent Measure and Control Instrument in the step (4) is communicated with, and said pH value Intelligent Measure and Control Instrument is connected with the control system.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107847857A (en) * | 2015-07-23 | 2018-03-27 | 三菱日立电力系统株式会社 | The method of operation of wet type flue gas desulfurization equipment and wet type flue gas desulfurization equipment |
| CN108744863A (en) * | 2018-08-02 | 2018-11-06 | 北京高能时代环境技术股份有限公司 | A kind of wastewater minimisation processing unit and method |
| CN109224805A (en) * | 2018-10-17 | 2019-01-18 | 四川锐源能环科技有限公司 | A kind of ultra-clean exhaust system of fire coal |
| CN110721562A (en) * | 2019-10-23 | 2020-01-24 | 安徽国能亿盛环保科技有限公司 | Alkali wet-type desulfurization and denitrification equipment |
| CN113289477A (en) * | 2021-06-15 | 2021-08-24 | 广东绿富域资源再生科技有限公司 | Flue gas purification and utilization system for slag flushing water of incineration slag of household garbage incinerator |
| CN113908679A (en) * | 2021-09-26 | 2022-01-11 | 江苏久发环境科技有限公司 | Synthetic gas purification method |
| CN116920536A (en) * | 2023-05-11 | 2023-10-24 | 国电环境保护研究院有限公司 | Coal-fired flue gas and desulfurization waste water treatment device |
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| CN1136976A (en) * | 1995-07-06 | 1996-12-04 | 北京市市政工程机械公司 | Flue gas redusting desulfurization method and device for coal-fired boiler |
| CN101837241A (en) * | 2010-05-13 | 2010-09-22 | 宜宾市蓝洁环保技术服务有限公司 | Desulfuration process and device thereof |
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| CN1136976A (en) * | 1995-07-06 | 1996-12-04 | 北京市市政工程机械公司 | Flue gas redusting desulfurization method and device for coal-fired boiler |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107847857A (en) * | 2015-07-23 | 2018-03-27 | 三菱日立电力系统株式会社 | The method of operation of wet type flue gas desulfurization equipment and wet type flue gas desulfurization equipment |
| CN107847857B (en) * | 2015-07-23 | 2021-03-26 | 三菱动力株式会社 | Wet flue gas desulfurization device and method for operating wet flue gas desulfurization device |
| CN108744863A (en) * | 2018-08-02 | 2018-11-06 | 北京高能时代环境技术股份有限公司 | A kind of wastewater minimisation processing unit and method |
| CN108744863B (en) * | 2018-08-02 | 2024-02-23 | 北京高能时代环境技术股份有限公司 | Wastewater reduction treatment device and method |
| CN109224805A (en) * | 2018-10-17 | 2019-01-18 | 四川锐源能环科技有限公司 | A kind of ultra-clean exhaust system of fire coal |
| CN109224805B (en) * | 2018-10-17 | 2024-02-20 | 四川锐源能环科技有限公司 | Coal-fired ultra-clean emission system |
| CN110721562A (en) * | 2019-10-23 | 2020-01-24 | 安徽国能亿盛环保科技有限公司 | Alkali wet-type desulfurization and denitrification equipment |
| CN113289477A (en) * | 2021-06-15 | 2021-08-24 | 广东绿富域资源再生科技有限公司 | Flue gas purification and utilization system for slag flushing water of incineration slag of household garbage incinerator |
| CN113908679A (en) * | 2021-09-26 | 2022-01-11 | 江苏久发环境科技有限公司 | Synthetic gas purification method |
| CN116920536A (en) * | 2023-05-11 | 2023-10-24 | 国电环境保护研究院有限公司 | Coal-fired flue gas and desulfurization waste water treatment device |
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Application publication date: 20121128 |