CN102188890A - Alkali liquor method for flue gas desulfurization - Google Patents
Alkali liquor method for flue gas desulfurization Download PDFInfo
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- CN102188890A CN102188890A CN2011101000880A CN201110100088A CN102188890A CN 102188890 A CN102188890 A CN 102188890A CN 2011101000880 A CN2011101000880 A CN 2011101000880A CN 201110100088 A CN201110100088 A CN 201110100088A CN 102188890 A CN102188890 A CN 102188890A
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- flue gas
- ammonia
- soda solution
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- alkali liquor
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Abstract
The invention belongs to the field of environmental engineering, and relates to an alkali liquor method for flue gas desulfurization. According to the method, residual ammonia water is utilized to replace part of a desulfurizer in a system for flue gas desulfurization by alkali liquor method, wherein an ammonia nitrogen content of the residual ammonia water is larger than 100mg/L, and a usage amount of the residual ammonia water is 20-80% of that of the desulfurizer. Meanwhile, a certain amount of an additive A can be added into the residual ammonia water, so that effective ammonia in the residual ammonia water, as a good alkaline absorbent, absorbs SO2 in flue gas, and the additive A can prolong the service life of cyclic alkali liquor, increase a desulfuration efficiency and enhance gypsum quality. The advantages of the invention are that the alkali liquor method for flue gas desulfurization is an efficient method that treats waste with waste and combines organics and inorganics, and valuable components in industrial waste are utilized comprehensively to realize treatment of waste with waste.
Description
Technical field
The invention belongs to field of environment engineering, relate in particular to a kind of soda solution grouting fume desulphurization method.
Background technology
According to State Environmental Protection Administration " China Environmental State Bulletin in 2008 ", SO in 2008
2Discharge capacity is 2321.2 ten thousand t, wherein industrial SO
2Discharge capacity is about 1991.3 ten thousand t.Unit such as China Environmental Science Research Institute, Tsing-Hua University studies show that, because SO
2Pollute Deng the acid rain that causes, the annual loss that causes to China is above 1,100 hundred million yuan.Reduce sulfur dioxide (SO2) emissions and become the emphasis of country's environmental protection the Eleventh Five-Year Plan period, Chinese Ministry of Environmental Protection " 12 " planning is tentatively worked out, and by 2015, the total emission volumn of sulfur dioxide will reduce 10% than 2010.
In wet fuel gas desulfurizing technology, not only reaction speed is fast, desulfuration efficiency is high for the dual alkali scrubbing FGD process technology, desulfurization product is easy to utilize, and fouling easily, blocking problem have been avoided in the general wet desulfurizing process well, simultaneously because its construction costs is low, occupation area of equipment is little, thereby has obtained in the flue gas desulfurization industry at home and abroad using more widely.But because the desulfurizing agent of its use is mainly alkali carbonate or alkali metal hydroxide, price is comparatively expensive; Simultaneously,, unavoidably loss can occur, therefore must often in desulfurizing tower, add fresh desulfurizing agent, cause the increase of operating cost although desulfurizing agent can obtain regeneration through the reaction with lime slurry.Remained ammonia is a kind of unmanageable industrial wastewater, and its meta-alkalescence, ammonia-nitrogen content are higher.
Summary of the invention
It is low to the purpose of this invention is to provide a kind of operating cost, and the treatment of wastes with processes of wastes against one another makes full use of the flue gas desulfurization technique of remained ammonia instead of part desulfurizing agent.
Technical scheme of the present invention is: a kind of soda solution grouting fume desulphurization method, it is characterized in that, and in the soda solution grouting flue gas desulphurization system, utilize remained ammonia partly to replace desulfurizing agent; Wherein, the ammonia-nitrogen content of remained ammonia is greater than 100mg/L, and the use amount of remained ammonia is the 20-80% of desulfurizing agent.
Further, in described soda solution grouting flue gas desulphurization system, also be added in additive A; The additive A addition is the 20-80% of remained ammonia and desulfurizing agent use amount sum.
Further, this method also comprises the regeneration stage: after reacted alkali lye and useless ammonia are entered the regenerated reactor device, in regenerating unit with Ca (OH)
2Slurries react, and regenerate KOH or NaOH and ammoniacal liquor, and KOH or NaOH and ammoniacal liquor return and proceeds desulphurization reaction in the desulfurizing tower.
Described additive A is an organic-molybdenum salt.
Described desulfurizing agent is K
2CO
3, Na
2CO
3, KOH or NaOH.
Principle of the present invention is: in the desulfurizing tower, in desulfurizing agent and smoke reaction, the ammonia nitrogen in the remained ammonia also participates in desulphurization reaction, generates (NH
4)
2SO
3, (NH
4)
2SO
3To SO
2Has stronger absorption reaction ability, with SO
2Reaction generates NH
4HSO
3, NH
4HSO
3Generate (NH with ammonia react again
4)
2SO
3(the NH that reaction generates
4)
2SO
3, desulfurizing agent and sulfur-containing smoke gas generate Na simultaneously
2SO
3, (NH
4)
2SO
3And Na
2SO
3After entering regenerating device, react, obtain CaSO with wherein lime slurry
3, ammonia and NaOH or KOH, ammonia of living again and NaOH or KOH circulation enter desulfurizing tower, and chlorion can cause the desulfurizing tower corrosion, so the chlorion in the desulphurization circulating liquid is accumulated to finite concentration, when being the pH value slant acidity of desulphurization circulating liquid, desulphurization circulating liquid need be discharged with the form of desulfurization wastewater.The present invention adds additive A in desulfurization alkali lye, the adding of additive A can make the interior free chloro ion content of desulfurizing tower reduce over half, the sour corrosion of reduction equipment, thereby kept the long reaction time, improved desulfuration efficiency, prolong equipment life, reduced maintenance of equipment and maintenance cost.Additive A can also improve the gypsum dehydration performance simultaneously, improves the gypsum quality.
Advantage of the present invention is: this not only can reduce the consumption of alkali carbonate or alkali metal hydroxide the present invention, reduces operating cost, makes remained ammonia obtain application simultaneously, has reduced processing cost, and the treatment of wastes with processes of wastes against one another greatly reduces the cost of engineering operation.Not only effectively utilize the effective ammonia in the remained ammonia, reduce doctor solution consumption, and effectively guaranteed desulfurization degree, the treatment of wastes with processes of wastes against one another.
The specific embodiment
The invention will be further described below by embodiment, and its purpose is better to understand content of the present invention.
Embodiment 1
Substitute 20% startup alkali with certain coke-oven plant's remained ammonia, test that ammonia-nitrogen content is 3200mg/L in the used remained ammonia, the addition of additive A is 0.3mg/L; SO in the test flue gas
2Mean concentration is 2000mg/m
3The flue gas average discharge is 600L/min; System entry flue gas mean temperature is 60 ℃; Remained ammonia and startup alkali are added in the desulfurizing tower respectively.Wherein start alkali and adopt NaOH, concentration is 0.4mol/L, and liquid-gas ratio is 2L/m
3SO in the flue gas after treatment
2Concentration is 100mg/m
3, desulfurization degree reaches 95.0%.System can move continuously and stably, and the material circulation is smooth and easy in the system.
Embodiment 2
Substitute 50% startup alkali with certain coke-oven plant's remained ammonia, test that ammonia-nitrogen content is 3200mg/L in the used remained ammonia, the addition of additive A is 0.3mg/L; SO in the test flue gas
2Mean concentration is 2000mg/m
3The flue gas average discharge is 600L/min; System entry flue gas mean temperature is 60 ℃; Remained ammonia and startup alkali are added respectively in the desulfurizing tower, wherein start alkali and adopt NaOH, concentration is 0.4mol/L, and liquid-gas ratio is 2L/m
3SO in the flue gas after treatment
2Concentration is 72mg/m
3, desulfurization degree reaches 96.4%.System can move continuously and stably, and the material circulation is smooth and easy in the system.
Embodiment 3
Substitute 80% startup alkali with certain coke-oven plant's remained ammonia, test that ammonia-nitrogen content is 3200mg/L in the used remained ammonia, the addition of additive A is 0.3mg/L; SO in the test flue gas
2Mean concentration is 2000mg/m
3The flue gas average discharge is 600L/min; System entry flue gas mean temperature is 60 ℃; Remained ammonia and startup alkali are added respectively in the desulfurizing tower, wherein start alkali and adopt NaOH, concentration is 0.4mol/L, and liquid-gas ratio is 2L/m
3SO in the flue gas after treatment
2Concentration is 106mg/m
3, desulfurization degree reaches 94.70%.System can move continuously and stably, and the material circulation is smooth and easy in the system.
Embodiment 4
Start alkali and all use NaOH, SO in the test flue gas
2Mean concentration is 2000mg/Nm
3The flue gas average discharge is 3000m
3/ h; System entry flue gas mean temperature is 60 ℃; Wherein starting alkali concn is 0.4mol/L, and liquid-gas ratio is 2L/m
3, the addition of additive A is 0.3mg/L.SO in the flue gas after treatment
2Concentration is 65mg/m
3, desulfurization degree reaches 96.75%.System can move continuously and stably, and the material circulation is smooth and easy in the system.
Comparative Examples
Start alkali and all use NaOH, SO in the test flue gas
2Mean concentration is 2000mg/Nm
3The flue gas average discharge is 3000m
3/ h; System entry flue gas mean temperature is 60 ℃; Wherein starting alkali concn is 0.4mol/L, and liquid-gas ratio is 2L/m
3SO in the flue gas after treatment
2Concentration is 96mg/m
3, desulfurization degree reaches 95.2%.System can move continuously and stably, and the material circulation is smooth and easy in the system.
Claims (5)
1. a soda solution grouting fume desulphurization method is characterized in that, utilizes remained ammonia partly to replace desulfurizing agent in the soda solution grouting flue gas desulphurization system; Wherein, the ammonia-nitrogen content of remained ammonia is greater than 100mg/L, and the use amount of remained ammonia is the 20-80% of desulfurizing agent.
2. according to right 1 described soda solution grouting fume desulphurization method, it is characterized in that described desulfurizing agent is K
2CO
3, Na
2CO
3, KOH or NaOH.
3. according to right 1 described soda solution grouting fume desulphurization method, it is characterized in that, in the soda solution grouting flue gas desulphurization system, in remained ammonia, be added in additive A; The additive A addition is the 20-80% of remained ammonia and desulfurizing agent use amount sum.
4. according to right 2 described soda solution grouting fume desulphurization methods, it is characterized in that described additive A is an organic-molybdenum salt.
5. according to 1 or 3 described soda solution grouting fume desulphurization methods, it is characterized in that this method also comprises the regeneration stage: after reacted alkali lye and useless ammonia are entered the regenerated reactor device, in regenerating unit with Ca (OH)
2Slurries react, and regenerate KOH or NaOH and ammoniacal liquor, and KOH or NaOH and ammoniacal liquor return and proceeds desulphurization reaction in the desulfurizing tower.
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|---|---|---|---|
| CN2011101000880A CN102188890A (en) | 2011-04-21 | 2011-04-21 | Alkali liquor method for flue gas desulfurization |
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|---|---|---|---|
| CN2011101000880A CN102188890A (en) | 2011-04-21 | 2011-04-21 | Alkali liquor method for flue gas desulfurization |
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ID=44598296
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| CN2011101000880A Pending CN102188890A (en) | 2011-04-21 | 2011-04-21 | Alkali liquor method for flue gas desulfurization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103113930A (en) * | 2013-02-28 | 2013-05-22 | 武汉钢铁(集团)公司 | Method and equipment for improving desulfurization efficiency of coke oven gas by vacuum potassium carbonate method |
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|---|---|---|---|---|
| CN1712113A (en) * | 2005-06-03 | 2005-12-28 | 吴金泉 | Smoke desulfidation from amino bialkali method |
| CN101347706A (en) * | 2008-08-28 | 2009-01-21 | 浙江天蓝脱硫除尘有限公司 | Flue gas desulfurization technique using dual alkali method with acetylene sludge as recycling agent |
| CN101352642A (en) * | 2007-07-25 | 2009-01-28 | 上海智方环保工程有限公司 | Flue gas desulfurization system by lime-sodium alkaline method |
| CN201445914U (en) * | 2009-05-07 | 2010-05-05 | 丹阳正通电力设备有限公司 | Combination fume purification device |
| CN201512520U (en) * | 2009-10-13 | 2010-06-23 | 孙启玉 | Ammonia-soda coke-oven gas desulphurization device |
| CN101759301A (en) * | 2008-12-26 | 2010-06-30 | 上海淼清水处理有限公司 | Anti-incrustation corrosion inhibitor for circulating water system with high concentration time and high chloride ion content |
-
2011
- 2011-04-21 CN CN2011101000880A patent/CN102188890A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1712113A (en) * | 2005-06-03 | 2005-12-28 | 吴金泉 | Smoke desulfidation from amino bialkali method |
| CN101352642A (en) * | 2007-07-25 | 2009-01-28 | 上海智方环保工程有限公司 | Flue gas desulfurization system by lime-sodium alkaline method |
| CN101347706A (en) * | 2008-08-28 | 2009-01-21 | 浙江天蓝脱硫除尘有限公司 | Flue gas desulfurization technique using dual alkali method with acetylene sludge as recycling agent |
| CN101759301A (en) * | 2008-12-26 | 2010-06-30 | 上海淼清水处理有限公司 | Anti-incrustation corrosion inhibitor for circulating water system with high concentration time and high chloride ion content |
| CN201445914U (en) * | 2009-05-07 | 2010-05-05 | 丹阳正通电力设备有限公司 | Combination fume purification device |
| CN201512520U (en) * | 2009-10-13 | 2010-06-23 | 孙启玉 | Ammonia-soda coke-oven gas desulphurization device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103113930A (en) * | 2013-02-28 | 2013-05-22 | 武汉钢铁(集团)公司 | Method and equipment for improving desulfurization efficiency of coke oven gas by vacuum potassium carbonate method |
| CN103113930B (en) * | 2013-02-28 | 2014-11-26 | 武汉钢铁(集团)公司 | Method and equipment for improving desulfurization efficiency of coke oven gas by vacuum potassium carbonate method |
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Application publication date: 20110921 |