CN102872693B - Processing method of waste nitric acid fume and device thereof - Google Patents
Processing method of waste nitric acid fume and device thereof Download PDFInfo
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- CN102872693B CN102872693B CN201110191399.2A CN201110191399A CN102872693B CN 102872693 B CN102872693 B CN 102872693B CN 201110191399 A CN201110191399 A CN 201110191399A CN 102872693 B CN102872693 B CN 102872693B
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Abstract
The invention discloses a processing method of waste nitric acid fume, comprising the following steps: 1) introducing waste nitric acid fume into a main absorbing tower so as to perform first integrated reaction between the waste nitric acid fume and an introduced medicine, wherein the medicine is sprayed in the motion direction of the waste nitric acid fume through spray equipment when the integrated reaction is performed, and during the first integrated reaction, a filter pack is used for deceleration of the waste gas, uniform distribution of the sprayed medicine and complete reaction; 2) arranging a hollow layer in the main absorbing tower, allowing the waste gas to pass through the hollow layer, and performing a second integrated reaction between the waste gas and the medicine introduced in the main absorbing tower; and 3) introducing the waste gas from the main absorbing tower into an auxiliary absorbing tower so as to perform reaction and absorption again in the auxiliary absorbing tower, and discharging into the atmosphere through a chimney. The invention also discloses a treatment device. By the adoption of the treatment device provided by the invention, acid fog and acid gas in the waste gas can be rapidly and thoroughly absorbed through reactions. The device has a simple structure, and is energy saving and environmentally friendly.
Description
Technical field
The present invention relates to surface treatment workshop acid mist processing technology field, is a kind of processing method of nitric acid mist waste gas and the technology of device thereof specifically.
Background technology
In aluminium bar founding, section bar extruding, surface treatment, deep processing, the acid mist that its surface treatment (anodic oxidation) produces, generally through ammonia neutralization, is discharged in atmosphere after the spray repeatedly of acid & alkali liquid, neutralisation treatment.Although this technique can be processed most acid mists,, in the time that exhaust gas volumn is large, neutralization reaction is insufficient, still intermittent the emerging of acid mist that part is yellow, and also the intrinsic penetrating odor of ammonia also can be at the low time period meeting contaminated air of air pressure.This acid mist knows that according to actual production analysis it mainly contains sulfuric acid, phosphoric acid, nitric acid, the acid mist that nitrous acid and water are mixed to form, also has a certain amount of nitrogen oxide (NO, NO2 etc.), wherein process acidic liquid and sour gas, available ammonia, ammoniacal liquor, liquid caustic soda (sodium hydrate aqueous solution), or the mixed liquor of ammoniacal liquor and liquid caustic soda, can adopt spray column or packed tower, due to sour gas to be processed (about 3 seconds) more difficult thorough reaction in the short time, absorb completely, in prior art, remove acid mist, acid gas main equipment has spray column, plate column, the towers such as packed tower, all types of equipment all can reach 80～90% the efficiency of removing in the time that parameter designing is reasonable, so do not meet environmental requirement but appoint, although and spray column is simple in structure, but cost is lower, the pressure loss is little, required fan energy consumption is low, operating flexibility is large, stable, but it is larger that gas liquid ratio needs, it is higher that plate column behaviour does efficiency, but operating flexibility is less, is not suitable for air quantity and changes occasion greatly, packed tower treatment effeciency ratio sprays tower height but filler involves great expense, and is generally applicable to little air quantity engineering.
Summary of the invention
The object of this invention is to provide a kind of processing method of nitric acid mist waste gas, reactive absorption falls acid mist, the acid gas in waste gas rapidly and thoroughly, simple in structure, energy-conserving and environment-protective.The present invention also provides a kind for the treatment of apparatus of nitric acid mist waste gas.
Object of the present invention is achieved through the following technical solutions.
A processing method for nitric acid mist waste gas, comprises the following steps:
1) nitric acid mist waste gas is introduced in a main absorption tower, in main absorption tower, be there is to combined reaction for the first time in nitric acid mist waste gas and the medicament of introducing in main absorption tower simultaneously, the direction of motion that faces toward nitric acid mist waste gas by the sprinkling equipment spray that liquidates there is medicament when combined reaction, and in combined reaction for the first time, adopt packing layer waste gas is slowed down and the medicament of spray is uniformly distributed, fully reaction;
2) hollow layer is set in main absorption tower, nitric acid mist waste gas after combined reaction for the first time passes through hollow layer, there is combined reaction for the second time with the medicament of introducing in main absorption tower again, in the time there is combined reaction for the second time, medicament is the direction of motion that faces toward nitric acid mist waste gas by the sprinkling equipment spray that liquidates, and adopt packing layer to slow down to waste gas in combined reaction for the second time, increase reaction compartment and time, and make waste gas not produce turbulent flow;
3) will introduce again a secondary absorption tower from main absorption tower waste gas out, in secondary absorption tower, react again and again absorb process, finally by smoke stack emission in atmosphere.
Medicament when react on described secondary absorption tower is again the direction of motion that faces toward waste gas by the sprinkling equipment spray that liquidates.
Described medicament is alkaline medicinal liquid, has also added tobacco adsorbent in alkaline medicinal liquid, makes the gaseous mixture of finally discharging from throat not be with steam.
Bottom and top in described main absorption tower are respectively equipped with bottom space and headroom, and the bottom in secondary absorption tower and top are respectively equipped with bottom space and headroom.
A kind of device of processing method of nitric acid mist waste gas, comprise the first absorption tower, second absorption tower, circulating water pool and alkaline water elevator pump, between the top on the first absorption tower and the bottom of second absorption tower, be connected with waste gas pipeline road, the top of second absorption tower is provided with chimney, in the first absorption tower, be that the first spraying filler layer and the second spraying filler layer are installed successively from bottom to top, between the first spraying filler layer and the second spraying filler layer, be provided with a hollow region, the first spraying filler layer and the first bottom surface, absorption tower form a bottom space, the second spraying filler layer and the first absorption tower end face form a headroom, in the bottom on the first absorption tower, exhaust input tube road is installed, exhaust input tube road is communicated with the bottom space of the below of the first spraying filler layer, in second absorption tower, be provided with between the first spraying filler layer and a packing layer and the two and be provided with a hollow region, the first spraying filler layer in the first absorption tower and the second spraying filler layer form by spray system in tower and porous plastic cement packing layer, the first spraying filler layer in second absorption tower is made up of spray system in tower and porous plastic cement packing layer, packing layer in second absorption tower is made up of porous plastic cement packing layer, the first absorption tower, in tower in second absorption tower, spray system is respectively by spray piping and circulating water pool, alkaline water elevator pump is connected to form water circulation pipe system.
The present invention compared with prior art has the following advantages:
The present invention is owing to having adopted the two-in-one main absorption tower of spray and filler, waste gas is successively carried out to combined reaction, and be the direction of motion that faces toward nitric acid mist waste gas by the sprinkling equipment spray that liquidates there is medicament when combined reaction, in combined reaction, adopt packing layer waste gas is slowed down and the medicament of spray is uniformly distributed, and hollow layer is set further waste gas is slowed down, increase reaction compartment and time, and make waste gas not produce turbulent flow, then will introduce again a secondary absorption tower from main absorption tower waste gas out, in secondary absorption tower, react again and absorb and process again, finally by smoke stack emission in atmosphere, as can be seen here, the present invention rapidly and thoroughly reactive absorption falls the acid mist in waste gas, acid gas, energy-conserving and environment-protective.
The first spraying filler layer on the first absorption tower in treating apparatus in the present invention, spray liquidates, and slows down, be uniformly distributed fully combined reaction, its hollow layer, malleation, pressure is low, has deceleration, increases reaction compartment and time, does not produce turbulent function, the second spraying filler layer, same spray liquidates, slow down, be uniformly distributed, fully combined reaction; The first spraying filler layer in second absorption tower, is auxiliary layer, absorbs for the second time and carries out water purification, after hollow layer, by packing layer, water filtration is fallen, this device structure is simple again, and cost of investment is low, can well realize aforesaid treatment technology scheme, there are equally energy-conserving and environment-protective.
Brief description of the drawings
Fig. 1 is the treating apparatus structural representation of nitric acid mist waste gas of the present invention.
Detailed description of the invention
A processing method for nitric acid mist waste gas, comprises the following steps:
1) nitric acid mist waste gas is introduced in a main absorption tower, in main absorption tower, be there is to combined reaction for the first time in nitric acid mist waste gas and the medicament of introducing in main absorption tower simultaneously, the direction of motion that faces toward nitric acid mist waste gas by the sprinkling equipment spray that liquidates there is medicament when combined reaction, and in combined reaction for the first time, adopt packing layer waste gas is slowed down and the medicament of spray is uniformly distributed, fully reaction;
2) hollow layer being set in main absorption tower slows down to waste gas, increase reaction compartment and time, and make waste gas not produce turbulent flow, nitric acid mist waste gas after combined reaction be for the first time that sprinkling equipment and packing layer are not installed by hollow layer, there is combined reaction for the second time with the medicament of introducing in main absorption tower again, in the time there is combined reaction for the second time, medicament is the direction of motion that faces toward nitric acid mist waste gas by the sprinkling equipment spray that liquidates, and adopt packing layer to slow down to waste gas in combined reaction for the second time, increase reaction compartment and time, and make waste gas not produce turbulent flow,
3) will introduce again a secondary absorption tower from main absorption tower waste gas out, in secondary absorption tower, react again and again absorb process, finally by smoke stack emission in atmosphere.Medicament when react on secondary absorption tower is again the direction of motion that faces toward waste gas by the sprinkling equipment spray that liquidates.
Its Chinese medicine is alkaline medicinal liquid, has also added tobacco adsorbent in alkaline medicinal liquid, makes the gaseous mixture of finally discharging from throat not be with steam.
Bottom in main absorption tower and top are respectively equipped with bottom space and headroom, and the bottom in secondary absorption tower and top are respectively equipped with bottom space and headroom.
Below in conjunction with accompanying drawing, the treating apparatus of nitric acid mist waste gas of the present invention is described in further detail.
As Fig. 1, the treating apparatus of nitric acid mist waste gas of the present invention, comprise the first absorption tower 1, second absorption tower 2, circulating water pool 3 and alkaline water elevator pump 4, between the bottom of the top on the first absorption tower 1 and second absorption tower 2, be connected with waste gas pipeline road 5, the top of second absorption tower 2 is provided with chimney 6, in the first absorption tower 1, be that the first spraying filler layer 11 and the second spraying filler layer 12 are installed successively from bottom to top, between the first spraying filler layer 11 and the second spraying filler layer 12, be provided with a hollow region 13, the first spraying filler layer 11 and the first bottom surface, absorption tower form a bottom space 14, the second spraying filler layer 12 and the first absorption tower end face form a headroom 15, in the bottom on the first absorption tower, exhaust input tube road 7 is installed, exhaust input tube road 7 is communicated with the bottom space 14 of the below of the first spraying filler layer, in second absorption tower 2, be provided with between the first spraying filler layer 21 and a packing layer 22 and the two and be provided with a hollow region 23, the first spraying filler layer 21 forms a bottom space 24 with the bottom surface of second absorption tower 2, packing layer 22 forms a headroom 25 with the end face of second absorption tower 2, the first spraying filler layer in the first absorption tower and the second spraying filler layer form by spray system in tower and porous plastic cement packing layer, the first spraying filler layer in second absorption tower is made up of spray system in tower and porous plastic cement packing layer, packing layer in second absorption tower is made up of porous plastic cement packing layer, the first absorption tower, in tower in second absorption tower, spray system is respectively by spray piping 8 and circulating water pool, alkaline water elevator pump is connected to form water circulation pipe system.
In tower in the first spraying filler layer in the first spraying filler layer in the first absorption tower, the second spraying filler layer, second absorption tower, spray system is positioned at the top of porous plastic cement packing layer, porous plastic cement packing layer includes the plastic cement filling tube of evenly arranging, each plastic cement filling tube is by stack shell and be distributed on vane group in cylinder and form and be at least provided with two-layer vane group, blade between upper and lower two-layer staggers mutually, and the stack shell wall of corresponding every one deck vane group is provided with through hole.Porous plastic cement packing layer is 2 meters of thickness.Gas skirt is installed entering before described exhaust input tube road.
The first absorption tower 1: bottom space, malleation, pressure is high; The first spraying filler layer: spray liquidates, slows down, and is uniformly distributed fully combined reaction; Hollow layer, malleation, pressure is low, waste gas is slowed down, increase reaction compartment and time, do not produce turbulent flow; The second spraying filler layer, spray liquidates, and slows down, and is uniformly distributed fully combined reaction; Headroom, negative pressure.
Second absorption tower 2: bottom space; The first spraying filler layer, is auxiliary layer, absorbs for the second time, and water purifies; Hollow layer; Packing layer, water filtration.
Claims (5)
1. a processing method for nitric acid mist waste gas, comprises the following steps:
1) nitric acid mist waste gas is introduced in a main absorption tower, in main absorption tower, be there is to combined reaction for the first time in nitric acid mist waste gas and the medicament of introducing in main absorption tower simultaneously, the direction of motion that faces toward nitric acid mist waste gas by the sprinkling equipment spray that liquidates there is medicament when combined reaction, and in combined reaction for the first time, adopt packing layer waste gas is slowed down and the medicament of spray is uniformly distributed, fully reaction;
2) hollow layer is set in main absorption tower, nitric acid mist waste gas after combined reaction for the first time passes through hollow layer, there is combined reaction for the second time with the medicament of introducing in main absorption tower again, in the time there is combined reaction for the second time, medicament is the direction of motion that faces toward nitric acid mist waste gas by the sprinkling equipment spray that liquidates, and adopt packing layer to slow down to waste gas in combined reaction for the second time, increase reaction compartment and time, and make waste gas not produce turbulent flow;
3) will introduce again a secondary absorption tower from main absorption tower waste gas out, in secondary absorption tower, react again and again absorb process, finally by smoke stack emission in atmosphere;
The bottom space on this main absorption tower and hollow layer are malleation, and the pressure of the bottom space on this main absorption tower is higher than the pressure of the hollow layer on this main absorption tower; The headroom on this main absorption tower is negative pressure, causes waste gas not produce turbulent flow;
The first spraying filler layer and a packing layer are installed in this pair absorption tower, and between the two, be provided with a hollow layer, wherein, this the first spraying filler layer is auxiliary layer, waste gas is absorbed and water purification for the second time, then waste gas falls water filtration by this packing layer after hollow layer, thereby realizes reaction again and absorb and process again.
2. the processing method of nitric acid mist waste gas according to claim 1, is characterized in that: medicament when react on described secondary absorption tower is again the direction of motion that faces toward waste gas by the sprinkling equipment spray that liquidates.
3. the processing method of nitric acid mist waste gas according to claim 1, is characterized in that: described medicament is alkaline medicinal liquid, has also added tobacco adsorbent in alkaline medicinal liquid, makes the gaseous mixture of finally discharging from throat not be with steam.
4. the processing method of nitric acid mist waste gas according to claim 1, is characterized in that: bottom and top in described main absorption tower are respectively equipped with bottom space and headroom, and the bottom in secondary absorption tower and top are respectively equipped with bottom space and headroom.
5. the device of the processing method of a nitric acid mist waste gas according to claim 4, comprise the first absorption tower, second absorption tower, circulating water pool and alkaline water elevator pump, between the top on the first absorption tower and the bottom of second absorption tower, be connected with waste gas pipeline road, the top of second absorption tower is provided with chimney, the first spraying filler layer and the second spraying filler layer are installed successively from bottom to top in the first absorption tower, between the first spraying filler layer and the second spraying filler layer, be provided with a hollow region, the first spraying filler layer and the first bottom surface, absorption tower form a bottom space, the second spraying filler layer and the first absorption tower end face form a headroom, in the bottom on the first absorption tower, exhaust input tube road is installed, exhaust input tube road is communicated with the bottom space of the below of the first spraying filler layer, in second absorption tower, be provided with between the first spraying filler layer and a packing layer and the two and be provided with a hollow region, the first spraying filler layer in the first absorption tower and the second spraying filler layer form by spray system in tower and porous plastic cement packing layer, the first spraying filler layer in second absorption tower is made up of spray system in tower and porous plastic cement packing layer, packing layer in second absorption tower is made up of porous plastic cement packing layer, the first absorption tower, in tower in second absorption tower, spray system is respectively by spray piping and circulating water pool, alkaline water elevator pump is connected to form water circulation pipe system, this porous plastic cement packing layer includes the plastic cement filling tube of evenly arranging, each plastic cement filling tube is by stack shell and be distributed on vane group in cylinder and form and be at least provided with two-layer vane group, blade between upper and lower two-layer staggers mutually, and the stack shell wall of corresponding every one deck vane group is provided with through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110191399.2A CN102872693B (en) | 2011-07-10 | 2011-07-10 | Processing method of waste nitric acid fume and device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110191399.2A CN102872693B (en) | 2011-07-10 | 2011-07-10 | Processing method of waste nitric acid fume and device thereof |
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| CN102872693A CN102872693A (en) | 2013-01-16 |
| CN102872693B true CN102872693B (en) | 2014-11-26 |
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| CN201110191399.2A Expired - Fee Related CN102872693B (en) | 2011-07-10 | 2011-07-10 | Processing method of waste nitric acid fume and device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105233603A (en) * | 2015-10-13 | 2016-01-13 | 安徽省绿巨人环境技术有限公司 | Treatment device and method for waste gas containing acid mist |
| CN109893982A (en) * | 2017-12-07 | 2019-06-18 | 孙兵 | A kind of efficient denitrifying device for pulverized-coal fired boiler |
| CN114950053A (en) * | 2022-05-18 | 2022-08-30 | 鞍山科德轧辊表面处理有限公司 | Chromium plating electroplating waste gas treatment device and method |
| CN117000018B (en) * | 2023-09-28 | 2023-12-19 | 福建德尔科技股份有限公司 | Alkali liquor spray tower for chloride treatment and application method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201079731Y (en) * | 2007-09-03 | 2008-07-02 | 上虞市玻璃纸有限公司 | Exhaust gas scrubbing absorber in glass paper producing process |
| CN202179927U (en) * | 2011-07-10 | 2012-04-04 | 台澳铝业（台山）有限公司 | Device for treating waste gas containing nitric acid mist |
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| JPH0622652B2 (en) * | 1985-12-27 | 1994-03-30 | セイコ−化工機株式会社 | Method of removing aerosol white smoke |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201079731Y (en) * | 2007-09-03 | 2008-07-02 | 上虞市玻璃纸有限公司 | Exhaust gas scrubbing absorber in glass paper producing process |
| CN202179927U (en) * | 2011-07-10 | 2012-04-04 | 台澳铝业（台山）有限公司 | Device for treating waste gas containing nitric acid mist |
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| JP昭62-155921A 1987.07.10 * |
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