CN1258556A - Equipment and method to exhaust nitridation waste gas and recover residual ammonia - Google Patents
Equipment and method to exhaust nitridation waste gas and recover residual ammonia Download PDFInfo
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- CN1258556A CN1258556A CN99124182A CN99124182A CN1258556A CN 1258556 A CN1258556 A CN 1258556A CN 99124182 A CN99124182 A CN 99124182A CN 99124182 A CN99124182 A CN 99124182A CN 1258556 A CN1258556 A CN 1258556A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The equipment consists of mainly a buffer, a first stage absorber, an ammonia water receiver, a second stage absorber and a waste liquid neutralizer. The buffer is connected through pipes to the first stage absorber and the second stage absorber successively, the overflow groove on one side of the first stage absorber is connected to the ammonia water receiver. The second stage absorber is connected through pipe with a valve to outside and its bottom is connected to the waste liquid neutralizer via a valve. The present invention exhausts nitridation waste gas and recovers residual ammonia through a two-stage absorption process.
Description
What the present invention relates to is the devices and methods therefor that a kind of exhaust nitridation waste gas and residual ammonia reclaim, and belongs to chemical heat treatment process and field of environment protection.
Nitriding is one of iron and steel chemical heat treatment process, and nitriding medium is an ammonia, and ammonia dissociation rate is 20-50% during nitriding, and then also having 50-80% is ammonia, and these treatment of waste gas ways are had:
1, general factory directly discharges this waste gas after nitriding.Ammonia is irritating a property gas, and this ammonia will produce very big irritating to the people above certain limit in production environment.If outside the workshop, discharge, then influence vicinity workshop workman or contiguous resident's health.
2, the factory that has with the waste gas ignition, though waste gas is to have burnt, can generate a small amount of extremely nitrogen oxide of poison, so there is hidden danger in the direct firing method of waste gas in order to reduce ammonia to the irritating of human body.
3, through literature search to this field, find Japan Patent: JP10141648, it to the characteristics of exhaust-gas treatment is:
1. waste gas in the blast pipe is directly imported in the water and absorb, but this absorption is incomplete, particularly ammonia concn more influences assimilation effect after improving;
2. this technology has a burner, with the NH in the part waste gas of discharging in the stove
3Burning, but the burning back produces the extremely nitrogen oxide (No of poison
x), causing environmental pollution, this patented technology proposes half ammonia is directly fed in the water, and second half ammonia burning becomes NO
2, then with NO
2Feed and form the ammoniacal liquor neutralization that generates behind nitric acid, nitrous acid and the previous logical ammonia in the same tank, become ammonium nitrate, ammonium nilrite can reach neutralization on this theoretical method.But in fact once absorbing nitrogen oxide and ammonia in tank all can not be fully, even adding agitator in tank, this method stirs, can not guarantee that also nitrogen oxide is thoroughly absorbed, thereby the nitrogen oxide that still has some in discharging gas exists, this method is in the process of exhaust-gas treatment on the other hand, with the ammonia resorbent scheme behind the nitrogen oxide of poling poison of burning, do not meet the requirement of Green heat treatment.
The objective of the invention is to overcome the deficiencies in the prior art, a kind of environmentally safe, cleaning discharging are provided, also can recycle the exhaust nitridation waste gas of residual ammonia and method and the device thereof that residual ammonia reclaims.
Technical scheme of the present invention is: the device that exhaust nitridation waste gas of the present invention and residual ammonia reclaim mainly is made of buffer, first order absorber, ammoniacal liquor storagetank, second level absorber and waste liquid neutralization chamber.Buffer links by pipeline and first order absorber, first order absorber links by pipeline and second level absorber again, the set overflow launder of one side of first order absorber communicates with the ammoniacal liquor storagetank, second level absorber can be communicated with the external world by switch control by pipeline, and second level absorber bottom can be communicated with the waste liquid neutralization chamber by switch control.Establish first order liquid holding box in the first order absorber, establish first order cage in the first order liquid holding box, establish stainless steel first order screen cloth in the first order cage; Establish second level liquid holding box in the absorber of the second level, establish second level cage in the liquid holding box of the second level, establish stainless steel second level sieve in the cage of the second level.The method that exhaust nitridation waste gas of the present invention and residual ammonia reclaim adopts the secondary absorption process, first order absorption process is that waste gas and the residual ammonia in the buffer feeds first order absorber through pipeline, fresh water also enters in the first order absorber through a side switch, waste gas and the residual ammonia Small Holes on pipeline flows out, the first order of flowing through again screen cloth, bubble is refinement once again, at this moment, a large amount of waste gas and residual ammonia are absorbed by water, and first order liquid holding box feeds the ammoniacal liquor storagetank with the ammonia that reclaims through overflow launder; Second level absorption process is handled for the waste gas that also leaves small amount of exhaust gas and ammonia that first order absorber is drawn again, the interior absorption liquid of second level absorber this moment is an aqueous hydrochloric acid solution, feeding the small amount of exhaust gas of second level absorber and the waste gas of ammonia flows out through the pipeline Small Holes, again through second level screen cloth, bubble is refinement once again again, aqueous hydrochloric acid solution has absorbed waste gas more up hill and dale, and the gas that second level absorber is emitted by switch control through pipeline meets the requirement of cleaning discharging fully.
The present invention has significant effect and substantive distinguishing features, and utilization of the present invention is of value to environmental protection, has changed direct discharging ammonia and because of waste gas burning produces the extremely nitrogen oxide of poison, and further turns waste into wealth, with remaining ammoniacal liquor as fertilizer.
Further the present invention is described in detail below in conjunction with accompanying drawing:
Fig. 1 apparatus of the present invention schematic diagram
As shown in Figure 1, the device that exhaust nitridation waste gas of the present invention and residual ammonia reclaim mainly is made of buffer 1, first order absorber 5, ammoniacal liquor storagetank 6, second level absorber 10 and waste liquid neutralization chamber 11.Buffer 1 links by pipeline and first order absorber 5, first order absorber 5 links by pipeline and second level absorber 10 again, the set overflow launder of one side of first order absorber 5 communicates with ammoniacal liquor storagetank 6, second level absorber 10 can be communicated with the external world by switch control by pipeline, and absorber 10 bottoms in the second level can be communicated with waste liquid neutralization chamber 11 by switch control.Establish first order liquid holding box 3 in the first order absorber 5, establish first order cage 2 in the first order liquid holding box 3, establish stainless steel first order screen cloth 4 in the first order cage 2, establish second level liquid holding box 8 in the second level absorber 10, establish second level cage 7 in the second level liquid holding box 8, establish stainless steel second level sieve 9 in the second level cage 7.The method that exhaust nitridation waste gas of the present invention and residual ammonia reclaim adopts the secondary absorption process, first order absorption process is that waste gas and the residual ammonia in the buffer 1 feeds first order absorber 5 through pipeline, fresh water also enters in the first order absorber 5 through a side switch, waste gas and the residual ammonia Small Holes on pipeline flows out, the first order of flowing through again screen cloth 4, bubble is refinement once again, at this moment, a large amount of waste gas and residual ammonia are absorbed by water, and first order liquid holding box 3 feeds ammoniacal liquor storagetank 6 with the ammonia that reclaims through overflow launder; Second level absorption process is handled for the waste gas that also leaves small amount of exhaust gas and ammonia that first order absorber 5 is drawn again, this moment, absorber 10 interior absorption liquids in the second level were aqueous hydrochloric acid solution, feeding the small amount of exhaust gas of second level absorber and the waste gas of ammonia flows out through the pipeline Small Holes, again through second level screen cloth 9, bubble is refinement once again again, aqueous hydrochloric acid solution has absorbed waste gas more up hill and dale, and the gas that second level absorber 10 is emitted by switch control through pipeline meets the requirement of cleaning discharging fully.
The performance of this method below is described in further detail:
Absorption process feeds the bottom of first order cage 2 with furnace gas, the bubbling that makes progress of the pore by the bottom pipe then, and placement of multiple layers stainless steel first segment screen cloth 4 in whole first order absorber 5 makes bubble pass through the 4 aperture refinements of first order screen cloth.A water inlet pipe is adorned in side in first order absorber 5 bottoms, make fresh water can constantly enter in the first order absorber 5, diluted ammonia concentration, draining is to arrange to the gap of first order cage 2 and first order liquid holding box 3 from the hole of the opposite side bottom of first order cage 2, first order liquid holding box 3 one sides have overflow launder, the height that can keep first order absorber 5 liquid levels, prevent the gas effusion, excess liquid flows in the ammoniacal liquor storagetank 6 by overflow launder, reclaim ammoniacal liquor, these ammoniacal liquor can be used as fertilizer, through the gas after handling like this is the ammonia of hydrogen+nitrogen+trace basically, and the outlet pipe of top is passed into (being aqueous hydrochloric acid solution in it) the second level cage 7 in first order absorber 5, placement of multiple layers stainless steel second level screen cloth 9 in the second level absorber 10, make fining air bubbles, waste gas (H
2+ N
2+ micro-NH
3) by hydrochloric acid solution just more up hill and dale with remaining micro-NH
3Absorb, the gas of Pai Chuing is H like this
2+ N
2, the pH value of periodic measurement hydrochloric acid solution to detect the consumption situation of hydrochloric acid, is in time added hydrochloric acid, with the efficient that guarantees to absorb.Excess liquid also can be overflowed from overflow launder.Solution in the second level liquid holding box 8 can regularly be emitted from the bottom and be entered the waste liquid neutralization chamber 11, these waste liquids are ammonium chloride and hydrochloric acid solution, waste liquid in partial ammonia water in the ammoniacal liquor storagetank 6 and the waste liquid neutralization chamber 11 is mixed, make it that neutralization reaction take place, control the balance of neutralization by control pH, make liquid become the aqueous ammonium chloride solution of pure neutrality, ammonium chloride can be reclaimed in water evaporation back.
Claims (4)
1, the device that a kind of exhaust nitridation waste gas and residual ammonia reclaim, by buffer 1, first order absorber 5 constitutes, it is characterized in that also comprising ammoniacal liquor storagetank 6, second level absorber 10 and waste liquid neutralization chamber 11, buffer 1 links by pipeline and first order absorber 5, first order absorber 5 links by pipeline and second level absorber 10, the set overflow launder of one side of first order absorber 5 communicates with ammoniacal liquor storagetank 6, second level absorber 10 can be communicated with the external world by switch control by pipeline, and absorber 10 bottoms in the second level can be communicated with waste liquid neutralization chamber 11 by switch control.
2, the device of this exhaust nitridation waste gas according to claim 1 and residual ammonia recovery, its feature also is to establish in the first order absorber 5 first order liquid holding box 3, establish first order cage 2 in the first order liquid holding box 3, establish stainless steel first order screen cloth 4 in the first order cage 2.
3, the device of this exhaust nitridation waste gas according to claim 1 and residual ammonia recovery, its feature also is to establish in the second level absorber 10 second level liquid holding box 8, establish second level cage 7 in the second level liquid holding box 8, establish stainless steel second level sieve 9 in the second level cage 7.
4, the method for a kind of exhaust nitridation waste gas and residual ammonia recovery, it is characterized in that adopting the secondary absorption process, first order absorption process is that waste gas and the residual ammonia in the buffer 1 feeds first order absorber 5 through pipeline, fresh water also enters in the first order absorber 5 through a side switch, waste gas and the residual ammonia Small Holes on pipeline flows out, the first order of flowing through again screen cloth 4, bubble is refinement once again, at this moment, a large amount of waste gas and residual ammonia are absorbed by water, and first order liquid holding box 3 feeds ammoniacal liquor storagetank 6 with the ammonia that reclaims through overflow launder; Second level absorption process is handled for the waste gas that also leaves small amount of exhaust gas and ammonia that first order absorber 5 is drawn again, this moment, absorber 10 interior absorption liquids in the second level were aqueous hydrochloric acid solution, feeding the small amount of exhaust gas of second level absorber and the waste gas of ammonia flows out through the pipeline Small Holes, again through second level screen cloth 9, bubble is refinement once again again, aqueous hydrochloric acid solution has absorbed waste gas more up hill and dale, and the gas that second level absorber 10 is emitted by switch control through pipeline meets the requirement of cleaning discharging fully.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99124182A CN1085555C (en) | 1999-12-01 | 1999-12-01 | Equipment and method to exhaust nitridation waste gas and recover residual ammonia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99124182A CN1085555C (en) | 1999-12-01 | 1999-12-01 | Equipment and method to exhaust nitridation waste gas and recover residual ammonia |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1258556A true CN1258556A (en) | 2000-07-05 |
| CN1085555C CN1085555C (en) | 2002-05-29 |
Family
ID=5283271
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99124182A Expired - Fee Related CN1085555C (en) | 1999-12-01 | 1999-12-01 | Equipment and method to exhaust nitridation waste gas and recover residual ammonia |
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| CN (1) | CN1085555C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674393A (en) * | 2011-03-18 | 2012-09-19 | 宝山钢铁股份有限公司 | Method for recycling waste ammonia water |
| CN102974194A (en) * | 2012-12-25 | 2013-03-20 | 李书庆 | Waste gas zero emission water circulation treatment device and method |
| CN103691255A (en) * | 2012-09-27 | 2014-04-02 | 古明见 | Waste gas recovery and regeneration method of organic metal chemical vapor deposition method |
| CN104083991A (en) * | 2014-06-26 | 2014-10-08 | 安徽淮化股份有限公司 | Device for recycling ammonia gas in refrigerating unit with liquid ammonia serving as refrigerating fluid |
| CN108057327A (en) * | 2017-12-15 | 2018-05-22 | 浙江工商大学 | A kind of purification of pollution air containing ammonia and recycling processing method |
| CN108421394A (en) * | 2018-05-04 | 2018-08-21 | 佛山市建金建电子科技有限公司 | A kind of activated carbon microbubble exhaust gas washing tower |
| CN113680184A (en) * | 2021-09-22 | 2021-11-23 | 华北电力大学（保定） | Low-carbon emission type VOCs purification device and method based on low-temperature plasma technology |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5210557A (en) * | 1975-07-16 | 1977-01-26 | Elna Co Ltd | Electrolyte for driving electrolytic capacitor |
| JPS5270975A (en) * | 1975-12-10 | 1977-06-13 | Hitachi Zosen Corp | Simultaneous removal of nox and hclin dust incinerator exhaus gas |
| US5244375A (en) * | 1991-12-19 | 1993-09-14 | Formica Technology, Inc. | Plasma ion nitrided stainless steel press plates and applications for same |
| JPH10141648A (en) * | 1996-11-08 | 1998-05-29 | Toshiba Mach Co Ltd | Method and apparatus for treating waste gas from gas nitriding process |
-
1999
- 1999-12-01 CN CN99124182A patent/CN1085555C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674393A (en) * | 2011-03-18 | 2012-09-19 | 宝山钢铁股份有限公司 | Method for recycling waste ammonia water |
| CN102674393B (en) * | 2011-03-18 | 2014-04-30 | 宝山钢铁股份有限公司 | Method for recycling waste ammonia water |
| CN103691255A (en) * | 2012-09-27 | 2014-04-02 | 古明见 | Waste gas recovery and regeneration method of organic metal chemical vapor deposition method |
| CN102974194A (en) * | 2012-12-25 | 2013-03-20 | 李书庆 | Waste gas zero emission water circulation treatment device and method |
| CN104083991A (en) * | 2014-06-26 | 2014-10-08 | 安徽淮化股份有限公司 | Device for recycling ammonia gas in refrigerating unit with liquid ammonia serving as refrigerating fluid |
| CN108057327A (en) * | 2017-12-15 | 2018-05-22 | 浙江工商大学 | A kind of purification of pollution air containing ammonia and recycling processing method |
| CN108057327B (en) * | 2017-12-15 | 2020-05-22 | 海宁蓝光环保科技有限公司 | Purification and resource treatment method for ammonia-containing polluted air |
| CN108421394A (en) * | 2018-05-04 | 2018-08-21 | 佛山市建金建电子科技有限公司 | A kind of activated carbon microbubble exhaust gas washing tower |
| CN113680184A (en) * | 2021-09-22 | 2021-11-23 | 华北电力大学（保定） | Low-carbon emission type VOCs purification device and method based on low-temperature plasma technology |
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| Publication number | Publication date |
|---|---|
| CN1085555C (en) | 2002-05-29 |
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