CN103239977A - Denitration method for cuprammouium complex by complexing absorption - Google Patents
Denitration method for cuprammouium complex by complexing absorption Download PDFInfo
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- CN103239977A CN103239977A CN201310177063XA CN201310177063A CN103239977A CN 103239977 A CN103239977 A CN 103239977A CN 201310177063X A CN201310177063X A CN 201310177063XA CN 201310177063 A CN201310177063 A CN 201310177063A CN 103239977 A CN103239977 A CN 103239977A
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Abstract
The invention discloses a denitration method for a cuprammouium complex by complexing absorption. The method comprises the following steps: mixing divalent soluble copper salt and ammonia water according to a certain proportion to prepare a cuprammouium complex solution in a certain concentration as a denitration absorption liquid; contacting the denitration absorption liquid with smoke to realize complexing absorption of NO; oxidizing the cuprammouium complex-NO complexing absorption liquid into NO2 under the condition of introducing O2; and meanwhile, adding potassium hydroxide into the absorption liquid to obtain a potassium nitrate fertilizer.
Description
Technical field
The present invention relates to smoke gas treatment and control technology field, specifically is exactly denitrating flue gas, especially a kind of cuprammonium complex complexed absorption method of denitration.
Background technology
The NOx discharging enters in the atmosphere and all can bring great harm to human and environment.Human body is by breathing in the NOx suction body, and NOx can stimulate respiratory apparatus, causes acute and slow poisoning, influences and is detrimental to health and animal and plant growth.NOx causes secondary pollution except causing also can look for the primary pollution: it can with atmosphere in drop form nitric acid or nitrous acid, finally form acid deposition (acid rain, acid mist etc.); Photochemical reaction takes place with O3 and HxCy in it in the troposphere, produce photochemical fog together with particle; The acid rain that thereupon forms in the preceding two kinds of harm of generation falls into water of river and lake and easily promotes body eutrophication, and both red tide and wawter bloom phenomenon damaged the ozone layer simultaneously, the occurrence probability in ozone cavity in the aggravation atmosphere.In a word, its harm can be summarized as: 1. produce the ecosystem and destroy problem; 2. be easy to the effect of body eutrophication; 3. to the generation in ozone cavity; 4. promote the generation of particle ash haze, photochemical fog phenomenon; 5. form nitric acid type acid rain.Therefore, how to solve the NO pollution problem cost-effectively, be the focus that national governments and scholar pay close attention to always.
The gas denitrifying technology of research and development mainly contains gas phase reduction process, catalytic decomposition method, plasma method, absorption method, liquid absorption method, liquid-film method and direct bioanalysis etc. at present.If can reclaim the NOx in the coal-fired flue-gas, be to realize turning waste into wealth and meet very much the actual national conditions of China, can not only reduce atmosphere pollution, also can remedy the china natural resources deficiency, have social benefit and the economic benefit of sustainable development.95% of NOx is NO in the flue gas, is SO and NO is insoluble in water (50 ℃ time its solubility in water be 38mg/L)
2And NO
2Below 1/1000.Therefore conventional alkali absorption method is invalid to NO; Simultaneously since the NO concentration in the flue gas between 0.02-0.1% (V), the reaction speed of autoxidation is very low.A direction is oxidized to NO with strong oxidizer with NO beyond doubt
2, adopt the alkali lye absorbing and removing then.Existing liquid phase oxidation agent mainly contains HNO
3, KMnO
4, NaClO
2, NaClO, H
2O
2, KBrO
3, K
2CrO
7, NaCrO
4(NH
4)
2CrO
7There are some unsolved key issues still in these methods, all will consume oxidant in addition in the process of oxidation NO, the operating cost height.
NO so addition is arranged, can be used as complex and is added in some complex structure and goes because unsaturated on the structure, forms new complex compound, and the present invention disposes the cuprammonium complex and realizes denitration as absorption liquid for this reason.
Summary of the invention
The present invention proposes a kind of cuprammonium complex wet flue gas denitration method.The principle of the invention is: become certain density cuprammonium complex solution as denitration absorbing liquor with ammoniacal liquor according to certain proportional arrangement the divalence soluble copper salt, contact with flue gas, realize the complexed absorption of NO, react (2) are feeding O
2Condition under cuprammonium complex-NO complexed absorption liquid oxygen is turned to NO
2, the anti-reaction (3) of giving birth to takes place, in absorption liquid, add potassium hydroxide simultaneously, obtain the potassium nitrate chemical fertilizer, (4) react.
Its reactional equation is:
Implementation of the present invention is:
At first flue gas enters in the denitration absorption tower, makes the spray absorption liquid with the cuprammonium complex solution for preparing in the denitration absorption tower, finishes the complexed absorption denitration in this absorption tower.With the absorption liquid oxidation after the denitration, obtain the potassium nitrate chemical fertilizer then.Flue-gas denitration process parameter described in the scheme is: the pH value is controlled between 5-9, and liquid-gas ratio is controlled at 2-12 L/m
3Between, the NO entrance concentration is no more than 1000ppm, cuprammonium complex mass percent concentration: 0.5%-6%, and the ratio of ammoniacal liquor and cupric amount is 1:4, potassium hydroxide absorption liquid concentration mass percent concentration: 1%-10%.
Description of drawings
Fig. 1 is cuprammonium complex complexed absorption denitrating technique flow chart.
The specific embodiment
Further set forth below in conjunction with the present invention of embodiment, but the present invention not only limits to following embodiment.
Embodiment 1
The denitrating flue gas test is being carried out in the device as shown in drawings, spray absorber diameter 200mm, and high 100cm glass tower, the gas-liquid two-phase adverse current, the flue gas flow is 40m
3/ h, cuprammonium complex spray flux is 80L/h, temperature is 40 ℃, the pH value is that 7.5, NO entrance concentration is 500ppm, and the concentration of potassium hydroxide is 6%, cuprammonium complex concentration is 5%, NO imports and exports the concentration Britain KM940 of Kain Co., Ltd. flue gas analyzer mensuration in the flue gas, and stable back NO exit concentration is 50ppm, and removal efficiency is 90%.
Embodiment 2
Experimental rig is identical with embodiment 1, just changes the operating condition of denitration, and gas flow is 50m in denitrating tower
3/ h, cuprammonium complex spray flux is 200L/h, and temperature is 50 ℃, and the pH value is that 9, NO entrance concentration is 600ppm, and the concentration of potassium hydroxide is 5%, and cuprammonium complex concentration is 2%, and stable back NO exit concentration is 50ppm, and removal efficiency is 91.7%.
Embodiment 3
Experimental rig is identical with embodiment 1, and gas flow is 20m in denitrating tower
3/ h, cuprammonium complex spray flux is 80L/h, and temperature is 40 ℃, and the pH value is that 8, NO entrance concentration is 900ppm, and the concentration of potassium hydroxide is 10%, cuprammonium complex concentration is 3%.NO imports and exports the concentration Britain KM940 of Kain Co., Ltd. flue gas analyzer mensuration in the flue gas, and stable back NO exit concentration is 70ppm, and removal efficiency is 90%.
Claims (2)
1. become certain density cuprammonium complex solution as denitration absorbing liquor with ammoniacal liquor according to certain proportional arrangement the divalence soluble copper salt, contact with flue gas, realize the complexed absorption of NO, feeding O
2Condition under cuprammonium complex-NO complexed absorption liquid oxygen is turned to NO
2, in absorption liquid, add potassium hydroxide simultaneously, obtain the potassium nitrate chemical fertilizer.
2. the technological parameter of cuprammonium complex complexed absorption denitration is: the pH value is controlled between 5-9, and liquid-gas ratio is controlled at 2-12 L/m
3Between, the NO entrance concentration is no more than 1000ppm, cuprammonium complex mass percent concentration: 0.5%-6%, and the ratio of ammoniacal liquor and cupric amount is 1:4, potassium hydroxide absorption liquid concentration mass percent concentration: 1%-10%.
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| CN201310177063XA CN103239977A (en) | 2013-05-14 | 2013-05-14 | Denitration method for cuprammouium complex by complexing absorption |
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| CN201310177063XA CN103239977A (en) | 2013-05-14 | 2013-05-14 | Denitration method for cuprammouium complex by complexing absorption |
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ID=48920065
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50147467A (en) * | 1974-05-20 | 1975-11-26 | ||
| CN101530729A (en) * | 2009-03-09 | 2009-09-16 | 华东理工大学 | Multifunctional absorption tower for controlling NO and SO2 in waste gas simultaneously |
| CN101708419A (en) * | 2009-12-14 | 2010-05-19 | 南京师范大学 | Coal-fired flue gas denitration and desulfurization method combined with urea wet method |
| US20100172814A1 (en) * | 2005-12-14 | 2010-07-08 | Basf Catalysts Llc | Zeolite Catalyst With Improved NOx Reduction in SCR |
| CN102068893A (en) * | 2009-11-20 | 2011-05-25 | 四川帝澳环保节能工程有限公司 | Process for simultaneously desulfurizing and denitrating coal combustion flue gas by wet method |
-
2013
- 2013-05-14 CN CN201310177063XA patent/CN103239977A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50147467A (en) * | 1974-05-20 | 1975-11-26 | ||
| US20100172814A1 (en) * | 2005-12-14 | 2010-07-08 | Basf Catalysts Llc | Zeolite Catalyst With Improved NOx Reduction in SCR |
| CN101530729A (en) * | 2009-03-09 | 2009-09-16 | 华东理工大学 | Multifunctional absorption tower for controlling NO and SO2 in waste gas simultaneously |
| CN102068893A (en) * | 2009-11-20 | 2011-05-25 | 四川帝澳环保节能工程有限公司 | Process for simultaneously desulfurizing and denitrating coal combustion flue gas by wet method |
| CN101708419A (en) * | 2009-12-14 | 2010-05-19 | 南京师范大学 | Coal-fired flue gas denitration and desulfurization method combined with urea wet method |
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Application publication date: 20130814 |