CN104258715A - Technology for treating nitric oxide waste gas by urea treatment and treatment equipment - Google Patents
Technology for treating nitric oxide waste gas by urea treatment and treatment equipment Download PDFInfo
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- CN104258715A CN104258715A CN201410476292.6A CN201410476292A CN104258715A CN 104258715 A CN104258715 A CN 104258715A CN 201410476292 A CN201410476292 A CN 201410476292A CN 104258715 A CN104258715 A CN 104258715A
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Abstract
The invention relates to a technology for treating nitric oxide waste gas by urea treatment and treatment equipment. The technology is characterized by comprising the following steps of performing one-stage spraying, absorption and drying treatment on the nitric oxide waste gas by taking urea solution as a urea absorption solution to obtain gas; mixing the gas obtained in the first step with ozone in closed space; performing two-stage spraying, absorption and drying treatment on the gas obtained in the second step; discharging gas which is obtained in the last step and meets the standard. According to the technology and the treatment equipment, the absorption solution does not need to be replaced; secondary pollution is avoided, and the equipment operation cost is low; the treatment equipment is easy to manage and operate and is high in purification efficiency.
Description
Technical field
The invention belongs to enviromental protection and improvement equipment technical field, particularly relate to technique and treatment facility that a kind of urea method administers nitrous oxides exhaust gas.
Background technology
At present, in nitrous oxides exhaust gas Processing tecchnics, no matter concentration level is all generally adopt Alkali absorption technique.Existing problems are:
1. be applicable to low-concentration nitrogen oxide waste gas pollution control and treatment, poor for high concentration nitrous oxides exhaust gas treatment and purification effect, be difficult to qualified discharge after exhaust-gas treatment.
2. absorbing liquid main component is NaOH, through with reaction of nitrogen oxides after, have a large amount of inorganic salts produce, inorganic salts crystallization can affect the normal operation of abatement equipment.Must absorbing liquid be regularly replaced,
3. useless absorbing liquid is dealt with improperly and can be produced secondary pollution.
Summary of the invention
The present invention provides one not need to change absorbing liquid for solving in known technology the deficiency of the existing Alkali absorption nitrous oxides exhaust gas Processing tecchnics existed, non-secondary pollution, equipment operating cost is low, treatment facility manageability, simple to operate, the urea method that purification efficiency is high administers technique and the treatment facility of nitrous oxides exhaust gas.
The technical scheme that the present invention takes for the technical problem existed in solution known technology is: a kind of urea method administers the technique of nitrous oxides exhaust gas: it is characterized in that: this technique comprises the following steps:
A. urea liquid is adopted to carry out one-level spray, absorption and dry process as urea absorption liquid to nitrous oxides exhaust gas;
B. the gas obtained in step a and ozone are carried out hybrid reaction in enclosure space;
C. the gas obtained by step b carries out secondary spray, absorption and dry process;
D. step c gained gas up to standard is discharged.
For the abatement equipment that above-mentioned nitrous oxides exhaust gas is administered, it is characterized in that: comprise one-level filler spray column, secondary filler spray column and ozone generator, described one-level filler spray column comprises the one-level spray tower body of primary cycle water tank and column, described one-level spray tower body is located at the top that described one-level states cyclic water tank, the lower end of described one-level spray tower body communicates with described primary cycle water tank, the side, bottom of described one-level spray tower body has one-level exhaust gas inlet, the top of described one-level spray tower body has one-level waste gas outlet, described one-level spray tower body inside is provided with one deck one-level dehydration layer and two-layer one-level contact mass transfer layer, between described one-level dehydration layer and described one-level contact mass transfer layer, be spraying layer between two-layer one-level contact mass transfer layer, described spraying layer place is provided with first order jet nozzle, described first order jet nozzle is communicated with described primary cycle water tank by one-level water pipe, primary cycle water pump in tandem on described one-level water pipe, described primary cycle water tank has filling opening, described secondary filler spray column comprises the secondary spray tower body of secondary cycle water tank and column, described secondary spray tower body is located at the top of described secondary cycle water tank, the lower end of described secondary spray tower body communicates with described secondary cycle water tank, the side, bottom of described secondary spray tower body has secondary exhaust gas inlet, the top of described secondary spray tower body has secondary waste gas outlet, described secondary spray tower body inside is provided with one deck secondary dehydration layer and two-layer Secondary contact mass transfer layer, between described secondary dehydration layer and described Secondary contact mass transfer layer, be spraying layer between two-layer Secondary contact mass transfer layer, described spraying layer place is provided with secondary nozzle, described secondary nozzle is communicated with described secondary cycle water tank by secondary water pipe, secondary cycle water pump in tandem on described secondary water pipe, described secondary cycle water tank has filling opening, described one-level waste gas outlet is communicated by gas pipeline with described secondary exhaust gas inlet, and described gas pipeline communicates with described ozone generator near the leading portion of described one-level waste gas outlet, described one-level is stated in cyclic water tank and secondary cycle water tank has urea absorption liquid.
The advantage that the present invention has and good effect are:
The present invention is the supporting special equipment of urea absorption nitrous oxides exhaust gas treatment process.Nitrous oxides exhaust gas treatment effect is good, to nitrous oxides exhaust gas concentration strong adaptability, high to the treatment and purification rate of nitrous oxides exhaust gas.Absorbing liquid is the aqueous solution of urea, not containing other impurity.Only suitable water and urea need be supplemented during equipment runs, do not need to change absorbing liquid, the sodium nitrate produced in absorbing liquid in can effectively preventing equipment from running, the inorganic salts such as natrium nitrosum affect the normal operation for the treatment of facility, eliminate the trouble of periodic replacement absorbing liquid, reduce or avoid the secondary pollution that replacing absorbing liquid causes.
Ozone is passed in the gas pipeline entering secondary filler spray column leading portion at waste gas, make nitric oxide Quick Oxidation be nitrogen dioxide, nitrogen dioxide is effectively absorbed by aqueous solution of urea (absorbing liquid) again, and the nitrogen oxide contained by waste gas is removed, purification efficiency is high, good purification.
Accompanying drawing explanation
Fig. 1 is the structural representation of equipment in the present invention.
In figure: 1, one-level filler spray column;
1-1, primary cycle water tank; 1-2, one-level spray tower body; 1-3, one-level exhaust gas inlet; 1-4, one-level waste gas outlet; 1-5, one-level dehydration layer; 1-6, one-level contact mass transfer layer; 1-7, first order jet nozzle; 1-8, one-level water pipe; 1-9, primary cycle water pump;
2, secondary filler spray column;
2-1, secondary cycle water tank; 2-2, secondary spray tower body; 2-3, secondary exhaust gas inlet; 2-4, secondary waste gas outlet; 2-5, secondary dehydration layer; 2-6, Secondary contact mass transfer layer; 2-7, secondary nozzle; 2-8, secondary water pipe; 2-9, secondary cycle water pump;
3, ozone generator; 4, gas pipeline.
Detailed description of the invention
For summary of the invention of the present invention, Characteristic can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
A kind of urea method administers the technique of nitrous oxides exhaust gas: it is characterized in that: this technique comprises the following steps:
A. urea liquid is adopted to carry out one-level spray, absorption and dry process as urea absorption liquid to nitrous oxides exhaust gas;
B. the gas obtained in step a and ozone are carried out hybrid reaction in enclosure space;
C. the gas obtained by step b carries out secondary spray, absorption and dry process;
D. step c gained gas up to standard is discharged.
Nitrous oxides exhaust gas mainly consists of: nitric oxide (NO) and nitrogen dioxide (NO
2).
When carrying out one-level spray as urea absorption liquid to nitrous oxides exhaust gas with urea liquid, main chemical reactions is:
NO+NO
2+(NH
2)2CO→CO
2↑+2N
2↑+2H
2O
Waste gas is after one-level spray, and excessive nitric oxide (NO) needs to be oxidized to nitrogen dioxide (NO
2) react with urea liquid again and generate carbon dioxide (CO
2), nitrogen (N
2) and water (H
2o).Nitric oxide (NO) is at ozone (O
3) catalysis bring out the lower and oxygen (O in waste gas
2) carry out oxidation reaction generation nitrogen dioxide (NO
2).
NO+O
2+O
3＝NO
2+2O
2
NO
2nitrogen dioxide (NO
2) and urea (NH
2)
2the reaction of CO:
2NO
2+(NH
2)
2CO＝CO
2↑+2N
2↑+3H
2O
Advantage of the present invention is to nitrous oxides exhaust gas concentration strong adaptability, high to the treatment and purification rate of nitrous oxides exhaust gas, thoroughly can solve the phenomenon of " emitting tobacco ".
For an equipment for treating waste gas containing nitric oxide for above-mentioned technique, refer to Fig. 1, comprise one-level filler spray column 1, secondary filler spray column 2 and ozone generator 3.Nitrogen oxide carries out purified treatment by one-level filler spray column 1 and secondary filler spray column 2 successively.
Described one-level filler spray column 1 comprises the one-level spray tower body 1-2 of primary cycle water tank 1-1 and column.One-level spray tower body 1-2 is erected on the top that one-level states cyclic water tank 1-1, and the lower end of one-level spray tower body 1-2 communicates with primary cycle water tank 1-1.The side, bottom of described one-level spray tower body 1-2 has one-level exhaust gas inlet 1-3, and the top of described one-level spray tower body 1-2 has one-level waste gas outlet 1-4.In the present embodiment, one-level waste gas outlet 1-4 is located at the top of described one-level spray tower body 1-2.Nitrous oxides exhaust gas enters from one-level exhaust gas inlet 1-3, by going out from one-level waste gas outlet 1-4 behind the inside of one-level spray tower body 1-2.Described one-level spray tower body 1-2 inside is provided with one deck one-level dehydration layer 1-5 and two-layer one-level contact mass transfer layer 1-6.In the inside of one-level spray tower body 1-2, be followed successively by one-level dehydration layer 1-5 and two-layer one-level contact mass transfer layer 1-6 from one-level waste gas outlet 1-4 from one-level exhaust gas inlet 1-3 (namely from top to bottom).Described one-level is dewatered between layer 1-5 and described one-level contact mass transfer layer 1-6, is spraying layer between two-layer one-level contact mass transfer layer 1-6.Described spraying layer place is provided with first order jet nozzle 1-7.First order jet nozzle 1-7 sprays absorbing liquid to spray nitrous oxides exhaust gas.Described first order jet nozzle 1-7 is communicated with described primary cycle water tank 1-1 by one-level water pipe 1-8.Primary cycle water pump 1-9 in tandem on described one-level water pipe 1-8, the circulation that primary cycle water pump 1-9 is absorbing liquid provides power.Described primary cycle water tank 1-1 has filling opening.
Described secondary filler spray column 2 comprises the secondary spray tower body 2-2 of secondary cycle water tank 2-1 and column.Described secondary spray tower body 2-2 is erected on the top of described secondary cycle water tank 2-1.The lower end of secondary spray tower body 2-2 communicates with secondary cycle water tank 2-1.The side, bottom of secondary spray tower body 2-2 has secondary exhaust gas inlet 2-3.The top of secondary spray tower body 2-2 has secondary waste gas outlet 2-4.Secondary exhaust gas inlet 2-3 is communicated with above-mentioned one-level waste gas outlet 1-4 by gas pipeline 4, gas pipeline 4 communicates with ozone generator 3 near the leading portion of one-level waste gas outlet 1-4, ozone generator 3 makes to be full of ozone in breather line 4, and namely ozone reacted with the nitric oxide of its discharge at the discharge leading portion of one-level waste gas outlet 1-4.In the present embodiment, secondary waste gas outlet 2-4 is located at the top of secondary spray tower body 2-2.The nitrous oxides exhaust gas that one-level filler spray column 1 is discharged and the nitrogen dioxide generated in gas pipeline 4 enter from secondary exhaust gas inlet 2-3, by discharging gas up to standard from secondary waste gas outlet 2-4 after secondary spray tower body 2-2 inside purification.Secondary spray tower body 2-2 inside is provided with one deck secondary dehydration layer 2-5 and two-layer Secondary contact mass transfer layer 2-6.In the inside of secondary spray tower body 2-2, be followed successively by secondary dehydration layer 2-5 and two-layer Secondary contact mass transfer layer 2-6 from secondary waste gas outlet 2-4 from secondary exhaust gas inlet 2-3 (namely from top to bottom).Secondary dewaters between layer 2-5 and Secondary contact mass transfer layer 2-6, is spraying layer between two-layer Secondary contact mass transfer layer 2-6, and described spraying layer place is provided with secondary nozzle 2-7.Secondary nozzle 2-7 sprays absorbing liquid to spray nitrous oxides exhaust gas.Secondary nozzle 2-7 is communicated with secondary cycle water tank 2-1 by secondary water pipe 2-8, secondary cycle water pump 2-9 in tandem on secondary water pipe 2-8.The circulation that secondary cycle water pump 2-9 is absorbing liquid provides power.Described secondary cycle water tank 2-1 has filling opening.
One-level is stated in cyclic water tank 1-1 and secondary cycle water tank 2-1 has urea absorption liquid, and urea absorption liquid, as spray-absorption liquid, can eliminate the trouble of periodic replacement absorbing liquid, reduces or avoid the secondary pollution that replacing absorbing liquid causes.
Although the present invention is described in conjunction with above-described embodiment, but the present invention is not limited to above-described embodiment, those of ordinary skill in the art easily can carry out equivalence to the present embodiment and replace or modification, as two-layer contact mass transfer layer is changed to multilayer etc., but do not leave essential idea of the present invention and scope.
Claims (2)
1. the technique of a urea method improvement nitrous oxides exhaust gas: it is characterized in that: this technique comprises the following steps:
A. urea liquid is adopted to carry out one-level spray, absorption and dry process as urea absorption liquid to nitrous oxides exhaust gas;
B. the gas obtained in step a and ozone are carried out hybrid reaction in enclosure space;
C. the gas obtained by step b carries out secondary spray, absorption and dry process;
D. step c gained gas up to standard is discharged.
2. an equipment for treating waste gas containing nitric oxide for technique use described in claim 1, is characterized in that: comprise one-level filler spray column (1), secondary filler spray column (2) and ozone generator (3);
Described one-level filler spray column (1) comprises one-level spray tower body (1-2) of primary cycle water tank (1-1) and column, described one-level spray tower body (1-2) is located at the top that described one-level states cyclic water tank (1-1), the lower end of described one-level spray tower body (1-2) communicates with described primary cycle water tank (1-1), the side, bottom of described one-level spray tower body (1-2) has one-level exhaust gas inlet (1-3), the top of described one-level spray tower body (1-2) has one-level waste gas outlet (1-4), described one-level spray tower body (1-2) inside is provided with one deck one-level dehydration layer (1-5) and two-layer one-level contact mass transfer layer (1-6), between described one-level dehydration layer (1-5) and described one-level contact mass transfer layer (1-6), be spraying layer between two-layer one-level contact mass transfer layer (1-6), described spraying layer place is provided with first order jet nozzle (1-7), described first order jet nozzle (1-7) is communicated with described primary cycle water tank (1-1) by one-level water pipe (1-8), the upper primary cycle water pump (1-9) in tandem of described one-level water pipe (1-8), described primary cycle water tank (1-1) has filling opening,
Described secondary filler spray column (2) comprises secondary spray tower body (2-2) of secondary cycle water tank (2-1) and column, described secondary spray tower body (2-2) is located at the top of described secondary cycle water tank (2-1), the lower end of described secondary spray tower body (2-2) communicates with described secondary cycle water tank (2-1), the side, bottom of described secondary spray tower body (2-2) has secondary exhaust gas inlet (2-3), the top of described secondary spray tower body (2-2) has secondary waste gas outlet (2-4), described secondary spray tower body (2-2) inside is provided with one deck secondary dehydration layer (2-5) and two-layer Secondary contact mass transfer layer (2-6), between described secondary dehydration layer (2-5) and described Secondary contact mass transfer layer (2-6), be spraying layer between two-layer Secondary contact mass transfer layer (2-6), described spraying layer place is provided with secondary nozzle (2-7), described secondary nozzle (2-7) is communicated with described secondary cycle water tank (2-1) by secondary water pipe (2-8), the upper secondary cycle water pump (2-9) in tandem of described secondary water pipe (2-8), described secondary cycle water tank (2-1) has filling opening,
Described one-level waste gas outlet (1-4) is communicated by gas pipeline (4) with described secondary exhaust gas inlet (2-3), and described gas pipeline (4) communicates with described ozone generator (3) near the leading portion of described one-level waste gas outlet (1-4); Described one-level is stated in cyclic water tank (1-1) and secondary cycle water tank (2-1) has urea absorption liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410476292.6A CN104258715A (en) | 2014-09-18 | 2014-09-18 | Technology for treating nitric oxide waste gas by urea treatment and treatment equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410476292.6A CN104258715A (en) | 2014-09-18 | 2014-09-18 | Technology for treating nitric oxide waste gas by urea treatment and treatment equipment |
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| CN104258715A true CN104258715A (en) | 2015-01-07 |
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| CN201410476292.6A Pending CN104258715A (en) | 2014-09-18 | 2014-09-18 | Technology for treating nitric oxide waste gas by urea treatment and treatment equipment |
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| CN106731618A (en) * | 2017-02-14 | 2017-05-31 | 哈尔滨蔚蓝环保设备制造有限公司 | Boiler SNCR urea method denitrating systems |
| CN107905875A (en) * | 2017-12-18 | 2018-04-13 | 北京联飞翔科技股份有限公司 | A kind of purification of nitrogen oxides device and method |
| CN108176203A (en) * | 2017-12-29 | 2018-06-19 | 苏州市科林除尘设备有限公司 | Ferric oxide red colorant second oxidation technology waste gas processing method |
| CN108404629A (en) * | 2018-02-01 | 2018-08-17 | 高博集团有限公司 | A kind of filter case phosphatization exhaust treatment system |
| CN108554142A (en) * | 2018-04-20 | 2018-09-21 | 浙江大学 | A kind of removing arc tunnel ultrahigh concentration NOxSystem and method |
| CN112791574A (en) * | 2020-12-22 | 2021-05-14 | 广东绿茵环保科技有限公司 | Method and device for treating nitrogen oxides generated by combustion of natural gas |
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Application publication date: 20150107 |
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