CN102101005B - Method for treating sulfur dioxide smoke by using steel slag - Google Patents
Method for treating sulfur dioxide smoke by using steel slag Download PDFInfo
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- CN102101005B CN102101005B CN2011100284372A CN201110028437A CN102101005B CN 102101005 B CN102101005 B CN 102101005B CN 2011100284372 A CN2011100284372 A CN 2011100284372A CN 201110028437 A CN201110028437 A CN 201110028437A CN 102101005 B CN102101005 B CN 102101005B
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Abstract
The invention relates to a method for treating sulfur dioxide smoke by using steel slag, which comprises procedures of desulfurizing agent preparation, smoke absorption, neutralization oxidization and precipitation deslagging. The method is characterized by specifically comprising the steps of: 1, washing steel slag with water, circularly washing washed water until ion concentration and PH value reach a certain requirement to obtain a desulfurizing agent; 2, sending smoke to an absorption tower, pumping to the washed water to the absorption tower by using a pump, spraying into vaporific drops through a nozzle, and washing sulfur dioxide in the smoke to obtain sulfite slurry; 3, measuring partial slurry through a pH value tester, when the pH value reaches the set value, sending to a mixing tank, neutralizing with limestone, forcedly oxidizing to obtain calcium sulfite and calcium sulfate, and sending the calcium sulfite and the calcium sulfate to a settling tank; 4, after settling, discharging solid phase calcium sulfite and calcium sulfate (gypsum); and 5, discharging purified smoke from the upside of the absorption tower. The invention has the advantages of simple method, reasonable process, recycling of waste, extremely low cost of the desulfurizing agent, less investment, small water consumption, low electricity consumption and low and reasonable operation cost.
Description
Technical field
The invention belongs to the flue gas desulfurization technique field, particularly a kind ofly utilize slag to be rich in basic anhydride to can be used as desulfurizing agent, administer the method for sulfur dioxide flue gas.
Technical background
At present, the high wet desulphurization of desulfuration efficiency is adopted in boiler of power plant flue gas desulfurization more.Such as limestone-gypsum method, magnesium oxide method, manganese oxide method etc.The whole bag of tricks is had nothing in common with each other to the removal efficient of sulfur dioxide, selects to mainly contain with the factor that any method is considered: the time limit that the processing requirements of the source of absorbent and price, desulfurizing byproduct, system need to move, the size of smoke treatment amount and the height of content of sulfur dioxide etc.So according to specific time and site is developed the desulfuration efficiency height, project investment economizes, and the desulfur technology that operating cost is low is the task of top priority.
Slag mainly is comprised of oxides such as calcium, iron, silicon, magnesium, aluminium, manganese, phosphorus, wherein the oxide of calcium, iron, silicon accounts for the overwhelming majority, utilizes slag to be rich in the characteristics of basic anhydride, is used as desulfurizing agent, absorb the sulfur dioxide in the flue gas, realize the existing application of flue gas desulfurization.But method is different, and its desulfurized effect is also different with input cost.The wet-type desulfuration method for steel scoria of Chinese patent 200810153376.0 flue gases adopts slag to flue gas desulfurization, is provided with the ultrasonic wave solubilising, and solid-liquid separator is thrown in wetting agent, has virtually increased system's cost of investment.
Summary of the invention
The problem to be solved in the present invention provides a kind of method of utilizing blast furnace slag to administer sulfur dioxide flue gas, adopt simple ion measurement, with the measure of acid supervision mensuration, basic anhydride with the blast furnace slag hydrolysis, in the absorption tower, react generation sulphite with boiler smoke, mix again neutralization, oxidation through lime stone, flue gas is purified, and is settled out the accessory substance gypsum.Reach that method is simple, flow process rationally, twice laid, purpose that the desulfurizing agent cost is low.
The technical scheme that the present invention addresses the above problem employing is, a kind of method of utilizing slag to administer sulfur dioxide flue gas, by the desulfurizing agent preparation, smoke absorption, in and oxidation, precipitation deslagging operation forms,
(1) preparation desulfurizing agent: water flushing slag, the flushing water circulation flushing arranges ion concentration gauge and acid-base value PH analyzer at slag washing liquid storage tank export pipeline, until wherein ion concentration and pH value reach certain requirement, becomes desulfurizing agent;
(2) absorb flue gas: flue gas is sent into the absorption tower, and with being pumped to the absorption tower, through the nozzle ejection drop that nebulizes, the sulfur dioxide in the washing flue gas becomes the sulphite slurries with the slag flushing water, and slurries return to nozzle by circulating pump, repeatedly spray;
(3) in and oxidation: when the part slurries reach setting value through acid-base value PH analyzer data measured, deliver to mixing channel, drop into lime stone, air blast, with the lime stone neutralization, forced oxidation becomes calcium sulfite and calcium sulfate, then delivers to sedimentation basin;
(4) precipitation deslagging: through sedimentation, discharge solid phase calcium sulfite and calcium sulfate (gypsum); Supernatant returns is used as the flushing slag;
(5) purifying smoke: purifying smoke is discharged in the top, absorption tower.
Aforesaid a kind of method of utilizing slag to administer sulfur dioxide flue gas, it makes flushing water intermediate ion concentration reach 5%-30%.
Aforesaid a kind of method of utilizing slag to administer sulfur dioxide flue gas, the pH value of slurries is 5.6-7.2 in its control absorption tower.
Aforesaid a kind of method of utilizing slag to administer sulfur dioxide flue gas, the pH value of slurries is 6.7 ± 0.2 in its control mixing channel.
The invention has the beneficial effects as follows, contain a large amount of K in the blast furnace slag
+, Na
+, Ca
2+, Mg
2+Plasma makes the aobvious alkalescence of flushing water, and pH ≈ 12 has the ability of good absorbing sulfur dioxide in flue, has reached the purpose of waste recycling.Use the flushing water desulfurization, recirculated water is the aqueous solution of highly basic basically, in the cyclic process to water pump, pipeline, equipment all without corrosion and clogging, be convenient to equipment operation and maintenance; The precipitation of desulfurization product occurs in outside the absorption tower, has reduced the possibility of fouling in the tower, has also reduced the size on absorption tower, has reduced cost of investment; The consumption of supernatant alkalescence, alkalescence has obtained replenishing after returning the flushing slag waggon, and the water consumption is low; System equipment is simple, and slurry solid content is low, and power consumption is low.The present invention is applicable to utilize blast furnace slag to administer the method for sulfur dioxide flue gas.
Description of drawings
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is a kind of process chart that utilizes slag to administer the method for sulfur dioxide flue gas of the present invention.
The specific embodiment
Embodiment 1, as seen from Figure 1, a kind of method of utilizing slag to administer sulfur dioxide flue gas, by the desulfurizing agent preparation, smoke absorption, in and oxidation, precipitation deslagging operation forms,
(1) preparation desulfurizing agent: water flushing slag, the flushing water circulation flushing arranges ion concentration gauge and acid-base value PH analyzer at slag washing liquid storage tank export pipeline, until wherein ion concentration and pH value reach certain requirement, flushing water intermediate ion concentration reaches 5%-10%, becomes desulfurizing agent;
(2) absorb flue gas: flue gas is sent into the absorption tower, flushing water with being pumped to the absorption tower, through the nozzle ejection drop that nebulizes, is washed the sulfur dioxide in the flue gas, become the sulphite slurries, slurries return to nozzle by circulating pump;
(3) in and oxidation: the part slurries are through acid-base value PH analyzer data measured, when reaching setting value, when the pH of slurries in absorption tower value is reduced to 5.0 left and right sides, deliver to mixing channel, with the lime stone neutralization, and blast the force air oxidation, become calcium sulfite and calcium sulfate, when the pH value is 7 left and right sides, then deliver to sedimentation basin;
(4) precipitation deslagging: after the precipitation, discharge solid phase calcium sulfite and calcium sulfate (gypsum); Supernatant returns is used as the flushing slag;
(5) purifying smoke: purifying smoke is discharged in the top, absorption tower.
Embodiment 2: the circulation flushing blast furnace slag, make flushing water intermediate ion concentration reach 10%-20%, then deliver to the absorption tower reaction, when the pH of slurries in absorption tower value is reduced to 5.0 left and right sides, then drain into mixing channel outside, feeding lime stone carries out neutralization reaction, and blasts the force air oxidation, when the pH value is 7 left and right sides, the calcium sulfate slurries is drained into sedimentation basin carry out sedimentation.
Embodiment 3: the circulation flushing blast furnace slag, make flushing water intermediate ion concentration reach 20%-30%, then deliver to the absorption tower reaction, when the pH of slurries in absorption tower value is reduced to 6.0 left and right sides, then drain into mixing channel outside, feeding lime stone carries out neutralization reaction, and blasts the force air oxidation, when the pH value is 7 left and right sides, the calcium sulfate slurries is drained into sedimentation basin carry out sedimentation.
Embodiment 4: the circulation flushing blast furnace slag, make flushing water intermediate ion concentration reach 20%-30%, then deliver to the absorption tower reaction, when the pH of slurries in absorption tower value is reduced to 7.0 left and right sides, then drain into mixing channel outside, feeding lime stone carries out neutralization reaction, and blasts the force air oxidation, when the pH value is 7 left and right sides, the calcium sulfate slurries is drained into sedimentation basin carry out sedimentation.
Claims (4)
1. method of utilizing slag to administer sulfur dioxide flue gas, by the desulfurizing agent preparation, smoke absorption, in and oxidation, precipitation deslagging operation forms, and it is characterized in that:
(1) preparation desulfurizing agent: water flushing slag, the flushing water circulation flushing arranges ion concentration gauge and acidity-basicity ph analyzer at slag washing liquid storage tank export pipeline, until wherein ion concentration and pH value reach certain requirement, becomes desulfurizing agent;
(2) absorb flue gas: flue gas is sent into the absorption tower, and with being pumped to the absorption tower, through the nozzle ejection drop that nebulizes, the sulfur dioxide in the washing flue gas becomes the sulphite slurries with the slag flushing water, and slurries return to nozzle by circulating pump, repeatedly spray;
(3) in and oxidation: when the part slurries reach setting value through acidity-basicity ph analyzer data measured, deliver to mixing channel, drop into lime stone, air blast, with the lime stone neutralization, forced oxidation becomes calcium sulfite and calcium sulfate, then delivers to sedimentation basin;
(4) precipitation deslagging: through sedimentation, discharge solid phase calcium sulfite and calcium sulfate; Supernatant returns is used as the flushing slag;
(5) purifying smoke is discharged in the top, absorption tower.
2. a kind of method of utilizing slag to administer sulfur dioxide flue gas as claimed in claim 1 is characterized in that making flushing water intermediate ion concentration to reach 5%-30%.
3. a kind of method of utilizing slag to administer sulfur dioxide flue gas as claimed in claim 1, the pH value that it is characterized in that controlling slurries in the absorption tower is 5.6-7.2.
4. a kind of method of utilizing slag to administer sulfur dioxide flue gas as claimed in claim 1, the pH value that it is characterized in that controlling slurries in the mixing channel is 6.7 ± 0.2.
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| CN103090375B (en) * | 2013-02-16 | 2015-05-20 | 滕州亿达华闻煤电化有限公司 | Process for performing desulphurization by using slag of circulating fluidized bed boiler |
| CN105817134A (en) * | 2015-01-07 | 2016-08-03 | 河北衡兴环保设备工程有限公司 | Chemical process wet-method desulphurization technology |
| CN106178837A (en) * | 2016-08-16 | 2016-12-07 | 蒙自矿冶有限责任公司 | A kind of method with waste water washing, purifying flue gas |
| CN108310950B (en) * | 2018-04-10 | 2019-02-01 | 李威 | The device of processing is absorbed for industrial waste gas |
| CN108455678A (en) * | 2018-04-27 | 2018-08-28 | 北京科技大学 | The method that waste material combines the desulfurization of limestone/lime-gypsum method and prepares calcium ferrite |
| CN109092042A (en) * | 2018-08-30 | 2018-12-28 | 华电电力科学研究院有限公司 | It is a kind of that SO in flue gas is removed using steel slag2With SO3System and its working method |
| CN115555036B (en) * | 2022-11-11 | 2023-03-21 | 北京科技大学 | Catalyst for catalyzing hydrogen peroxide to oxidize NO and preparation method thereof |
| 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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| CN101428193B (en) * | 2008-11-26 | 2011-04-20 | 天津大学 | Wet-type desulfuration method for steel scoria with flue gas |
| CN101797467B (en) * | 2010-03-26 | 2012-03-28 | 周建安 | Dry flue gas desulphurization method using steel slag or blast furnace slag as absorbing agent |
| CN101905115A (en) * | 2010-08-16 | 2010-12-08 | 史汉祥 | Method for absorbing sulfur dioxide in flue gas by iron-making slag slurry and steel-making slag slurry |
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