CN112791574A - Method and device for treating nitrogen oxides generated by combustion of natural gas - Google Patents
Method and device for treating nitrogen oxides generated by combustion of natural gas Download PDFInfo
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- CN112791574A CN112791574A CN202011528799.3A CN202011528799A CN112791574A CN 112791574 A CN112791574 A CN 112791574A CN 202011528799 A CN202011528799 A CN 202011528799A CN 112791574 A CN112791574 A CN 112791574A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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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
Abstract
The invention discloses a method and a device for treating nitrogen oxides generated by natural gas combustion, and belongs to the field of waste gas treatment. The method for treating the nitrogen oxide generated by the combustion of the natural gas comprises the steps of preliminarily absorbing nitrogen oxide waste gas discharged by the rod furnace by using primary composite alkali liquor to eliminate nitrogen dioxide in the nitrogen oxide; drying and dehydrating the filtered gas obtained in the step S1, and oxidizing the filtered gas in a high-concentration ozone generator to oxidize nitrogen monoxide in the waste gas into nitrogen dioxide; and (4) introducing the nitrogen dioxide waste gas obtained in the step (S2) into a secondary composite alkali liquor, and absorbing the nitrogen dioxide by the secondary composite alkali liquor and then discharging the nitrogen dioxide after reaching the standard. According to the method and the device for treating the nitrogen oxide generated by the combustion of the natural gas, disclosed by the invention, the nitrogen oxide waste gas discharged by the rod furnace is washed and absorbed in a composite alkali liquor spraying mode, so that the concentration of the nitrogen oxide and the concentration of dust particles in the waste gas are effectively removed.
Description
Technical Field
The invention relates to the field of waste gas treatment, in particular to a method and a device for treating nitrogen oxides generated by natural gas combustion.
Background
The aluminum material overstock heating is key equipment of each aluminum material factory, China is a large aluminum material producing country, the aluminum materials are widely applied, furniture and decorative materials from airplanes, high-speed rails, automobiles to daily life are all made of aluminum materials at present, the aluminum material pressurizing and heating are basically heated by natural gas, and nitrogen oxide is generated when the natural gas is combusted.
At present, many natural gas combustion waste gases are directly discharged, generally, the concentration of nitrogen oxides in the combustion waste gases is generally about 180-250 mg/m in double-cropping labor, which exceeds 2-3 times of the requirement of the national environmental protection policy on nitrogen oxide concentration lower than 100mg/m in double-cropping labor; however, most of the conventional rod furnace has the central combustion temperature of 600-800 ℃, but the exhaust gas discharged from the outlet of the rod furnace has the temperature of 250-300 ℃, and the ammonia denitration cannot be adopted at the temperature (400-450 ℃ is required).
Some aluminum material factories adopt a low-nitrogen combustion method, but the concentration of nitrogen oxides discharged by the aluminum material factories also cannot reach the emission standard all the time, and the heating time for heating the aluminum bar by the low-nitrogen combustion method is prolonged, so that the yield of the factories is seriously reduced.
The technical problem to be solved by the invention is how to effectively treat the nitrogen oxide waste gas generated by the combustion of natural gas.
Disclosure of Invention
The invention aims to provide a method and a device for effectively absorbing and purifying nitrogen oxides generated by burning natural gas of nitrogen oxide waste gas. In order to achieve the purpose, the invention adopts the following technical scheme that the method for treating the nitrogen oxides generated by the combustion of the natural gas comprises the following steps:
s1, primarily absorbing the nitrogen oxide waste gas discharged by the rod furnace through primary composite alkali liquor to eliminate nitrogen dioxide in the nitrogen oxide;
s2, drying and dehydrating the filtered gas obtained in the step S1, and enabling the filtered gas to enter a high-concentration ozone generator for oxidation, so that nitric oxide in the waste gas is oxidized into nitrogen dioxide;
s3, introducing the nitrogen dioxide waste gas obtained in the step S2 into a secondary composite alkali liquor, and absorbing the nitrogen dioxide by the secondary composite alkali liquor and then discharging the nitrogen dioxide after reaching the standard.
According to the invention, nitrogen dioxide in the nitrogen oxide waste gas is effectively absorbed through two times of absorption of the composite alkali liquor, nitrogen oxide flue gas purification under a low-temperature condition is realized, and the nitrogen oxide concentration in the discharged waste gas is lower than 50mg/m in a high-speed dry-method aluminum material factory while the production efficiency of the aluminum material factory is not influenced, so that the emission reduction effect is achieved.
In some embodiments, the composite alkali liquor in steps S1 and S3 is fully contacted with the nitrogen oxide waste gas in a spraying mode. The spraying mode is adopted, particles in the nitrogen oxide waste gas are effectively removed, and the nitrogen oxide waste gas is fully contacted and absorbed.
In some embodiments, the composite alkali liquor in steps S1 and S3 is sprayed by the first spray tower and the second spray tower respectively, and absorbs nitrogen dioxide in the nitrogen oxide waste gas introduced into the first spray tower and the second spray tower. The spraying tower is adopted for spraying, and the spraying effect is good.
In some embodiments, the first spray tower and the second spray tower absorb nitrogen dioxide and simultaneously scrub and remove dust particles in the nitrogen oxide waste gas. Dust particles are effectively removed by spraying and washing, and the removal rate reaches 96%.
In some embodiments, the temperature of the nitrogen oxide exhaust gas discharged from the outlet of the rod furnace is 250 ℃ to 300 ℃.
In some embodiments, in step S2, a dry de-watering operation is performed by a de-watering demisting system, wherein the ozone oxidation capacity is enhanced by a catalyst in an ozone generator. The catalyst effectively improves the ozone oxidation capacity, and the improvement effect reaches 20-25%.
The nitrogen oxide treatment device that natural gas burning produced, including excellent stove, the nitrogen oxide waste gas that excellent stove export discharged out loops through first spray column, dehydration defogging system, ozone generator and second spray column and discharge to reach standard, still includes alkali lye circulation pond, and alkali lye circulation pond carries out compound alkali lye circulation with first spray column and second spray column respectively.
Through the flow treatment of the treatment device, the concentration and the temperature of the composite alkali liquor of the first spray tower and the second spray tower are ensured through the alkali liquor circulating tank, and the absorption effect of nitrogen oxides is ensured.
In some embodiments, a low temperature catalyst is disposed within the ozone generator. The low-temperature catalyst effectively strengthens the oxidation capability of ozone.
In some embodiments, the composite alkali solution is a sodium hydroxide solution. And the absorption of nitrogen dioxide is realized by adopting sodium hydroxide.
The invention has the beneficial effects that: according to the method and the device for treating the nitrogen oxide generated by the combustion of the natural gas, disclosed by the invention, the nitrogen oxide waste gas discharged by the rod furnace is washed and absorbed in a composite alkali liquor spraying mode, so that the concentration of the nitrogen oxide and the concentration of dust particles in the waste gas are effectively removed.
Drawings
FIG. 1 is a schematic flow diagram of a process for treating nitrogen oxides produced by the combustion of natural gas in accordance with the present invention.
FIG. 2 is a schematic structural diagram of a nitrogen oxide treatment apparatus produced by combustion of natural gas according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the method for treating nitrogen oxides generated by combustion of natural gas comprises the following steps:
s1, primarily absorbing the nitrogen oxide waste gas discharged by the rod furnace through primary composite alkali liquor to eliminate nitrogen dioxide in the nitrogen oxide;
s2, drying and dehydrating the filtered gas obtained in the step S1, and enabling the filtered gas to enter a high-concentration ozone generator for oxidation, so that nitric oxide in the waste gas is oxidized into nitrogen dioxide;
s3, introducing the nitrogen dioxide waste gas obtained in the step S2 into a secondary composite alkali liquor, and absorbing the nitrogen dioxide by the secondary composite alkali liquor and then discharging the nitrogen dioxide after reaching the standard.
In the steps S1 and S3, the composite alkali liquor is fully contacted with the nitrogen oxide waste gas in a spraying mode. The spraying mode is adopted, particles in the nitrogen oxide waste gas are effectively removed, and the nitrogen oxide waste gas is fully contacted and absorbed.
And (5) respectively spraying the composite alkali liquor in the steps S1 and S3 through a first spray tower and a second spray tower, and absorbing nitrogen dioxide in the nitrogen oxide waste gas introduced into the first spray tower and the second spray tower. The spraying tower is adopted for spraying, and the spraying effect is good.
The first spray tower and the second spray tower absorb nitrogen dioxide and simultaneously wash and remove dust particles in the nitrogen oxide waste gas.
The composite alkali liquor adopts sodium hydroxide solution, and the principle that the composite alkali liquor absorbs nitrogen dioxide is as follows:
in step S2, after dehydrating and drying the filtered gas after the nitrogen dioxide is absorbed by the first step of spraying, the remaining nitrogen monoxide in the exhaust gas is introduced into a high-concentration ozone generator, and is efficiently oxidized under the action of a low-temperature catalyst, the principle is as follows:
and nitrogen dioxide generated by oxidation and reduction is sprayed and absorbed by the last-stage composite alkali liquor, and then the nitrogen dioxide can reach the discharge standard.
After the particulate matters in the waste gas are washed by the spray tower twice, 96% of dust particles in the smoke are removed, and the dust can be discharged after being treated.
As shown in fig. 2, the nitrogen oxide treatment device produced by natural gas combustion comprises a rod furnace 1, wherein nitrogen oxide waste gas discharged from an outlet of the rod furnace 1 sequentially passes through a first spray tower 2, a dehydration and demisting system 3, an ozone generator 4 and a second spray tower 5 and is discharged up to the standard, and the device also comprises an alkali liquor circulation tank 6, wherein the alkali liquor circulation tank 6 respectively performs composite alkali liquor circulation with the first spray tower 2 and the second spray tower 5.
The rod furnace 1 can be a plurality of, and a plurality of rod furnaces 1 are opened and closed through rod furnace control switch control pipeline to control waste gas input speed and volume.
The alkali liquor circulating tank 6 respectively inputs circulating alkali liquor into the first spray tower 2 and the second spray tower 5, and meanwhile, the circulating alkali liquor is recycled through pipelines at the bottoms of the first spray tower 2 and the second spray tower 5.
The nitrogen oxide waste gas purification process comprises the following steps:
stick stove 1 passes through pipeline control nitrogen oxide waste gas and gets into first spray column 2, first spray column 2 preliminarily sprays and absorbs the nitrogen dioxide in the nitrogen oxide waste gas to nitrogen oxide waste gas, nitrogen oxide waste gas gets into dehydration defogging system 3 behind first spray column 2 and carries out dehydration drying, nitrogen oxide waste gas after the drying gets into ozone generator 4, be provided with high concentration ozone and the low temperature catalyst of reinforcing oxidation effect in ozone generator 4, the nitrogen monoxide in the nitrogen oxide waste gas that gets into ozone generator 4 is oxidized into nitrogen dioxide, nitrogen dioxide waste gas after ozone generator 4 redox gets into second spray column 5, carry out the second time and spray the washing and absorb behind the nitrogen dioxide, discharge up to standard.
In this embodiment, through actual detection, the emission parameters are obtained:
performing dry year at a standard dry flow rate of 9737 m/h, performing average flow rate of 10.4 m/h, performing thin film vapor phase epitaxy on the nitrogen oxide at an actual emission concentration of 8mg/m, performing thin film vapor phase epitaxy on the nitrogen oxide at a reduced emission concentration of 36mg/m, and performing thin film vapor phase epitaxy on the nitrogen oxide at an actual emission rate of 0.08 kg/h; and carrying out the actual measurement on the emission concentration of the particulate matters to be 2.1mg/m, carrying out the ethanol cultivation according to the conversion of the emission concentration to be 9.4mg/m, and carrying out the actual measurement on the emission rate to be 0.02 kg/h.
The measured data fully shows the treatment effect of the method, and provides an excellent treatment scheme for solving the problem of nitrogen oxides generated by natural gas combustion.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (8)
1. The method for treating the nitrogen oxides generated by the combustion of the natural gas is characterized by comprising the following steps of:
s1, primarily absorbing the nitrogen oxide waste gas discharged by the rod furnace through primary composite alkali liquor to eliminate nitrogen dioxide in the nitrogen oxide;
s2, drying and dehydrating the filtered gas obtained in the step S1, and enabling the filtered gas to enter a high-concentration ozone generator for oxidation, so that nitric oxide in the waste gas is oxidized into nitrogen dioxide;
s3, introducing the nitrogen dioxide waste gas obtained in the step S2 into a secondary composite alkali liquor, and absorbing the nitrogen dioxide by the secondary composite alkali liquor and then discharging the nitrogen dioxide after reaching the standard.
2. The method of claim 1, wherein the composite lye is sprayed to fully contact with the nitrogen oxide waste gas in steps S1 and S3.
3. The method as claimed in claim 2, wherein the composite lye is sprayed by the first spray tower and the second spray tower respectively in steps S1 and S3, and absorbs nitrogen dioxide in the nitrogen oxide waste gas introduced into the first spray tower and the second spray tower.
4. The method for treating nitrogen oxides generated by combustion of natural gas as claimed in claim 3, wherein the first spray tower and the second spray tower absorb nitrogen dioxide and simultaneously wash and remove dust particles in the nitrogen oxide waste gas.
5. The method of claim 1, wherein in step S2, the drying and de-watering operation is performed by a de-watering and de-misting system, and the ozone oxidation capacity of the ozone generator is enhanced by a catalyst.
6. The nitrogen oxide treatment device that natural gas burning produced, its characterized in that, including excellent stove, the nitrogen oxide waste gas that excellent stove export discharged out loops through first spray column, dehydration defogging system, ozone generator and second spray column and discharge to reach standard, still includes alkali lye circulation pond, alkali lye circulation pond carries out compound alkali lye circulation with first spray column and second spray column respectively.
7. The apparatus of claim 7, wherein a low temperature catalyst is disposed within the ozone generator.
8. The apparatus for treating nitrogen oxides generated by burning natural gas as claimed in claim 7, wherein said composite alkali solution is sodium hydroxide solution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011528799.3A CN112791574A (en) | 2020-12-22 | 2020-12-22 | Method and device for treating nitrogen oxides generated by combustion of natural gas |
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| CN202011528799.3A CN112791574A (en) | 2020-12-22 | 2020-12-22 | Method and device for treating nitrogen oxides generated by combustion of natural gas |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101543723B (en) * | 2009-05-08 | 2011-03-23 | 大连汪洋环境工程有限公司 | Process for processing nitrogen-oxide waste gas containing acidic gas |
| CN104258715A (en) * | 2014-09-18 | 2015-01-07 | 天津市嘉腾环保设备有限公司 | Technology for treating nitric oxide waste gas by urea treatment and treatment equipment |
| JP2018015716A (en) * | 2016-07-28 | 2018-02-01 | 株式会社東芝 | Denitrification system and denitrification method |
| CN211635984U (en) * | 2020-01-09 | 2020-10-09 | 河北巨英除尘设备制造安装有限公司 | Flue gas desulfurization and denitrification treatment equipment |
-
2020
- 2020-12-22 CN CN202011528799.3A patent/CN112791574A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101543723B (en) * | 2009-05-08 | 2011-03-23 | 大连汪洋环境工程有限公司 | Process for processing nitrogen-oxide waste gas containing acidic gas |
| CN104258715A (en) * | 2014-09-18 | 2015-01-07 | 天津市嘉腾环保设备有限公司 | Technology for treating nitric oxide waste gas by urea treatment and treatment equipment |
| JP2018015716A (en) * | 2016-07-28 | 2018-02-01 | 株式会社東芝 | Denitrification system and denitrification method |
| CN211635984U (en) * | 2020-01-09 | 2020-10-09 | 河北巨英除尘设备制造安装有限公司 | Flue gas desulfurization and denitrification treatment equipment |
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