CN101077468A - Method for decreasing nitrous oxides of fire coal station boiler flue gas - Google Patents
Method for decreasing nitrous oxides of fire coal station boiler flue gas Download PDFInfo
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- CN101077468A CN101077468A CN 200610046690 CN200610046690A CN101077468A CN 101077468 A CN101077468 A CN 101077468A CN 200610046690 CN200610046690 CN 200610046690 CN 200610046690 A CN200610046690 A CN 200610046690A CN 101077468 A CN101077468 A CN 101077468A
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- flue gas
- coal
- nitrogen oxide
- station boiler
- power station
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Abstract
The method of decreasing nitrogen oxide in fume of coal burning power plant boiler is to spray ammonium carbonate or ammonium bicarbonate as the reductant into the fume at temperature of 800-1200 deg.c in coal burning boiler to react with NOx produced during burning coal. This can lower the NOx content in the fume by 30-70 % while producing a fume ammonia leaking rate lower than 10 ppm. Compared with the technological process with urea or ammonia water as the reductant, the present invention has one 20-40 % lowered running cost and wider application foreground.
Description
Technical field:
The present invention relates to the coal-fired power station boiler flue gas and reduce the nitrogen oxide technology, this technology can be applied to the emission control process of coal-fired station's pollutant-nitrogen oxide, is suitable for the technological transformation of reduction nitrogen oxide and the construction project of existing or newly-built large, medium and small unit.
Background technology:
Along with Chinese economic development, the environmental pollution that brings in energy-consuming is also more and more serious.Wherein the destruction of atmosphere flue dust, acid rain, greenhouse effects and ozone layer has become four big killers of harm people existence.Harmful substances such as the contained flue dust of coal-fired flue-gas, sulfur dioxide, nitrogen oxide are to cause the main root of atmosphere pollution, acid rain and greenhouse effects.The disaster of acid rain and acid mist frequently takes place in the quite a sheet of region in China south and area, the west and south.China in terms of environmental conditions communique in 2000 shows that in 338 cities of statistics, 63.5% city surpasses national air quality secondary standard, wherein surpasses 112 cities that have of grade III Standard, accounts for 33.1% of monitoring city.The coal in China reserves are abundant, and annual output surpasses 1,000,000,000 t.The energy that China's fire coal is obtained reaches more than 75% of energy total amount, and this energy resource structure can not change in recent years.Meanwhile sulfur dioxide that discharges in the coal-fired flue-gas and nitrogen oxide account for 90% of national total release.The burning of coal has caused the NOx in the serious air pollution, particularly coal-fired flue-gas, and the pollution of atmosphere has been become a major issue that can not be ignored.From Eleventh Five-Year Plan, the power plant emission nitrogen oxide is implemented overall control; The power plant emission standard of up-to-date revision will all be carried out the emission concentration standard of same strictness to the old and new's unit, and regulation in " collection of drainage dues use and management regulations " is carried out the collection of drainage dues standard identical with sulfur dioxide to nitrogen oxide.Therefore active research developmental research denitration technology to satisfy requirement on environmental protection, has environment, economy and the social effect of reality.
The a lot of in recent years especially southern coastal cities, city of China continue to increase electric demand, China's power station power supply can't bear the heavy load a bit, domestic a lot of power plant starts (major part is a thermal power plant) one after another to alleviate city short of electricity problem, this certainly will increase coal-fired consumption figure, nitrogen oxide output also can increase thereupon, if do not work out the coal-fired flue gas denitration technology of effective suitable China's national situation rapidly, the atmosphere environmental protection cause of China will be faced with acid test again.And along with people's improving constantly to environmental requirement, discharge standard from now on certainly will be also more and more stricter, 2008 Beijing success of application for organizing the Olympic Games particularly, the theme of the Green Olympics are impelled Beijing to make the coal-fired power station boiler NOx of Beijing discharging in 2005 to be lower than 250mg/Nm
3Requirement, with respect to present 650mg/Nm
3Requirement want strict many.
For coal-fired electric generation furnace, control NOx discharging mainly is divided into two kinds of technical approach, and a kind of is burning control promptly reduces NOx in combustion process growing amount; Another kind is that the control of burning back is gas denitrifying technology, divides SCR and SNCR technology in the denitration technology again.The efficient of combustion control technology control NOx discharging is lower, can not surpass 50% generally speaking, and present NOx discharge standard is higher than 50% substantially, therefore, just need take gas denitrifying technology to control the discharge capacity of NOx.Aspect the NOx control technology, American-European many countries have all used business-like low NOx combusting technology, and wherein countries such as Austria, Japan, Germany have used business-like gas denitrifying technology.Nowadays, the nearly 300 cover SNCR devices in the whole world are applied to station boiler, Industrial Boiler, municipal garbage incinerator and other burner.Applied to use in all types of boilers of various fuel in the commerce application of U.S. SNCR and the demonstration project of full size now, wherein there are 30 station boilers to use the SNCR technology, capacity is about 7100MW altogether, wherein have the capacity of 5 units to surpass 600MW, heap(ed) capacity has reached 640MW.
When introducing external advanced SNCR gas denitrifying technology, also require China foreign technology to be digested and absorbs in this field, and the road of walking out the gas denitrifying technology of a suitable China's national situation comes the commercial production domesticization of using of realization SNCR gas denitrifying technology.
Summary of the invention:
The object of the present invention is to provide a kind of method that reduces nitrogen oxide in the coal-fired power station boiler flue gas, this method can reduce the operating cost of removal of nitrogen oxide in the coal-fired power station boiler flue gas significantly.
The present invention specifically provides the method for a kind of reduction coal-fired power station boiler flue gas nitrogen oxide (NOx), it is characterized in that: with ammonium carbonate and/or carbonic hydroammonium is reducing agent, and the straying quatity of ammonium carbonate and/or carbonic hydroammonium is to spray into by 0.8～2.5 equivalent proportion according to the content of NOx in the flue gas.
Coal-fired power station boiler flue gas of the present invention reduces in the method for nitrogen oxide, and the flue-gas temperature scope that described NOx removes reaction is 800～1200 ℃.
Coal-fired power station boiler flue gas of the present invention reduces in the method for nitrogen oxide, and the reaction time range that described NOx removes reaction is 0.3～0.8s.
Coal-fired power station boiler flue gas of the present invention reduces in the method for nitrogen oxide, and described ammonium carbonate and/or carbonic hydroammonium are that the form with the aqueous solution sprays into burner hearth, and liquid concentration is 5%～20%.
Coal-fired power station boiler flue gas of the present invention reduces nitrogen oxide technical process and method, and it is characterized in that: described ammonium carbonate and/or ammonium bicarbonate soln are to spray in the burner hearth as carrier with compressed air.
The present invention also provides in a kind of coal-fired power station boiler stove that is specifically designed to said method and removed the nitrogen oxide system, it is characterized in that: this system is by ammonium carbonate and/or carbonic hydroammonium material handler (1), storage facilities (2), constitute with water mixing device (3), jetting device (4), spray gun device (5), boiler (6) and chamber flue gas temperature measurement mechanism (7).
The technology that the present invention relates to is that flue gas reduces a kind of of nitrogen oxide, and the basic principle of this technology is based on the SNCR technology.Particularly, provide the coal-fired power station boiler flue gas to reduce the another reducing agent of nitrogen oxide, be ammonium carbonate and carbonic hydroammonium, in coal-burning boiler, spray into the reaction of nitrogen oxides that produces in ammonium carbonate or bicarbonate and the coal combustion, spraying into a position is 800～1200 ℃ in flue-gas temperature, can reduce in the flue gas 30～70% nitrogen oxide, and the leak rate of ammonia is＜10ppm in the flue gas.Ammonium carbonate or bicarbonate be as reducing agent, in being injected to boiler furnace before atomizing or be injected in the boiler by the atomizing of the heat of vaporization in the stove, in suitable temperature range, as follows with the chemical equation of NO:
(NH
4)
2CO
3+2NO+1/2O
2→2N
2+CO
2+4H
2O
2NH
4HCO
3+2NO+1/2O
2→2N
2+2CO
2+5H
2O
The present invention adopts ammonium carbonate and carbonic hydroammonium to replace and uses urea or ammoniacal liquor to remove reducing agent as NOx abroad in the SNCR denitration technology, be suitable for China's national situation, China's ammonium carbonate and carbonic hydroammonium source abundant and distribute wide, price is lower and keep the safety in production.
The present invention has following advantage:
(1) reducing nitrogen oxide efficient is 30～70%;
(2) secondary pollution level is low.The leak rate of ammonia can reach＜10ppm.
(3) compare as reducing agent with normally used urea or ammoniacal liquor and can reduce by 20～40% operating cost.The present invention has more wide range of commercial application prospect.
Description of drawings:
Fig. 1 is for removing the signal of nitrogen oxide system architecture in the coal-fired power station boiler stove.
The specific embodiment:
Remove the nitrogen oxide system architecture in the coal-fired power station boiler stove as shown in Figure 1,1 handler among the figure, 2 storage facilities, 3 and water mixing device, 4 spray into system, 5 gun systems, 6 boilers, 7 chamber flue gas temperature measurement mechanisms, after ammonium carbonate or carbonic hydroammonium and water mix in a certain amount of ratio, deposit in the storage tank, extract ammonium carbonate or ammonium bicarbonate soln by measuring pump from jar, compressed air sprays into ammonium carbonate or ammonium bicarbonate soln in the flue-gas temperature scope certain in the burner hearth from spray gun as carrier, makes it to mix with flue gas and react.
Embodiment 1
Certain coal-fired power station boiler, 125MW generating set, Coal-fired capacity are 55t/h, are under 1.2 the condition at excess air coefficient, the exhaust gas volumn that burning produces is 8.34Nm
3/ kg, NOx concentration is 300～500ppm in the flue gas.Idiographic flow is:
Ammonium carbonate is deposited in the storage facilities (2) by handler (1), deliver to water mixing device (3) and be made into certain density ammonium carbonate solution, after chamber flue gas temperature measurement mechanism (7) is measured flue-gas temperature, after having determined to spray into the position, ammonium carbonate by system of spraying into (4) and gun system (5), is delivered to NOx reaction in boiler (6) and the flue gas.This system's removal efficiency of nitrogen oxides is 45.39%.
Embodiment 2
Certain coal-fired power station boiler, 200MW generating set, Coal-fired capacity are 115.2t/h, are under 1.32 the condition at excess air coefficient, the exhaust gas volumn that burning produces is 9.25Nm
3/ kg, NOx concentration is 200～400ppm in the flue gas.Idiographic flow is:
Directly buy certain density sal volatile, be deposited in the storage facilities (2), after chamber flue gas temperature measurement mechanism (7) is measured flue-gas temperature, after having determined to spray into the position, ammonium carbonate by system of spraying into (4) and gun system (5), is delivered to NOx reaction in boiler (6) and the flue gas.This system's removal efficiency of nitrogen oxides is 49.31%.
Embodiment 3
Certain coal-fired power station boiler, 350MW generating set, Coal-fired capacity are 129.5t/h, are under 1.26 the condition at excess air coefficient, the exhaust gas volumn that burning produces is 8.93Nm
3/ kg, NOx concentration is 300～500ppm in the flue gas.Idiographic flow is:
Carbonic hydroammonium is deposited in the storage facilities (2) by handler (1), deliver to water mixing device (3) and be made into certain density ammonium bicarbonate aqueous solution, after chamber flue gas temperature measurement mechanism (7) is measured flue-gas temperature, determine 820 ℃ the position that sprays into, carbonic hydroammonium by system of spraying into (4) and gun system (5), is delivered to NOx reaction in boiler (6) and the flue gas.Removal efficiency of nitrogen oxides saw Table 1 after this system sprayed into the carbonic hydroammonium of different equivalent proportions.
The test of table 1 carbonic hydroammonium denitration efficiency
| Stoichiometric ratio | 0.8 | 1 | 1.2 | 1.5 |
| Denitration rate (%) | 32.89 | 41.79 | 47.65 | 56.82 |
Embodiment 4
Certain coal-fired power station boiler, 2.5MW generating set, Coal-fired capacity are 32t/h, are under 1.14 the condition at excess air coefficient, the exhaust gas volumn that burning produces is 7.09Nm
3/ kg, NOx concentration is 300～500ppm in the flue gas.Idiographic flow is:
Carbonic hydroammonium is deposited in the storage facilities (2) by handler (1), deliver to water mixing device (3) and be made into certain density ammonium bicarbonate aqueous solution, after chamber flue gas temperature measurement mechanism (7) is measured flue-gas temperature, determine 870 ℃ the position that sprays into, carbonic hydroammonium by system of spraying into (4) and gun system (5), is delivered to NOx reaction in boiler (6) and the flue gas.Removal efficiency of nitrogen oxides saw Table 2 after this system sprayed into the carbonic hydroammonium of different equivalent proportions.
The test of table 2 carbonic hydroammonium denitration efficiency
| Stoichiometric ratio | 0.80 | 1.00 | 1.20 | 1.50 |
| Denitration rate (%) | 46.20 | 57.50 | 62.39 | 73.59 |
Embodiment 5
Certain coal-fired power station boiler, 2.5MW generating set, Coal-fired capacity are 26t/h, are under 1.2 the condition at excess air coefficient, the exhaust gas volumn that burning produces is 8.52Nm
3/ kg, NOx concentration is 300～500ppm in the flue gas.Idiographic flow is:
Carbonic hydroammonium is deposited in the storage facilities (2) by handler (1), deliver to water mixing device (3) and be made into certain density ammonium bicarbonate aqueous solution, after chamber flue gas temperature measurement mechanism (7) is measured flue-gas temperature, after having determined to spray into the position, carbonic hydroammonium by system of spraying into (4) and gun system (5), is delivered to NOx reaction in boiler (6) and the flue gas.Removal efficiency of nitrogen oxides saw Table 3 after this system sprayed into the ammonium carbonate of different equivalent proportions.
The test of table 3 carbonic hydroammonium denitration efficiency
| Stoichiometric ratio | 1 | 1.5 | 2 | Spray into a temperature (℃) |
| Denitration rate (%) | 45.39 | 64.91 | 80.23 | 850 |
| 49.32 | 61.21 | 78.11 | 900 |
Claims (6)
1. method that reduces coal-fired power station boiler flue gas nitrogen oxide (NOx), it is characterized in that: with ammonium carbonate and/or carbonic hydroammonium is reducing agent, and the straying quatity of ammonium carbonate and/or carbonic hydroammonium is to spray into by 0.8～2.5 equivalent proportion according to the content of NOx in the flue gas.
2. reduce the method for nitrogen oxide according to the described coal-fired power station boiler flue gas of claim 1, it is characterized in that: the flue-gas temperature scope that described NOx removes reaction is 800～1200 ℃.
3. reduce the method for nitrogen oxide according to the described coal-fired power station boiler flue gas of claim 1, it is characterized in that: the reaction time range that described NOx removes reaction is 0.3～0.8s.
4. reduce the method for nitrogen oxide according to the described coal-fired power station boiler flue gas of claim 1, it is characterized in that: described ammonium carbonate and/or carbonic hydroammonium are that the form with the aqueous solution sprays into burner hearth, and concentration is 5%～20%.
5. reduce nitrogen oxide technical process and method according to the described coal-fired power station boiler flue gas of claim 1, it is characterized in that: described ammonium carbonate and/or ammonium bicarbonate soln are to spray in the burner hearth as carrier with compressed air.
6. remove the nitrogen oxide system in the coal-fired power station boiler stove that a kind is specifically designed to the described method of one of claim 1～5, it is characterized in that: this system is by ammonium carbonate and/or carbonic hydroammonium material handler (1), storage facilities (2), constitute with water mixing device (3), jetting device (4), spray gun device (5), boiler (6) and chamber flue gas temperature measurement mechanism (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610046690 CN101077468A (en) | 2006-05-26 | 2006-05-26 | Method for decreasing nitrous oxides of fire coal station boiler flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610046690 CN101077468A (en) | 2006-05-26 | 2006-05-26 | Method for decreasing nitrous oxides of fire coal station boiler flue gas |
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| Publication Number | Publication Date |
|---|---|
| CN101077468A true CN101077468A (en) | 2007-11-28 |
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ID=38905231
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610046690 Pending CN101077468A (en) | 2006-05-26 | 2006-05-26 | Method for decreasing nitrous oxides of fire coal station boiler flue gas |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101574616B (en) * | 2009-06-08 | 2011-09-07 | 叶力平 | Flue gas denitrification process for preparing ammonia with ammonium bicarbonate dry method by pyrolysis and system thereof |
| CN102114380B (en) * | 2009-12-31 | 2013-09-04 | 中国环境科学研究院 | Method for removing NOX in flue gas |
| CN106316531A (en) * | 2016-08-25 | 2017-01-11 | 辽宁津大肥业有限公司 | New application of coal-fired boiler fuel gas in the production of compound fertilizer |
| CN108905595A (en) * | 2018-09-20 | 2018-11-30 | 北京英斯派克科技有限公司 | A kind of flue gas in power station boiler Dry denitration method |
| CN114025495A (en) * | 2021-11-11 | 2022-02-08 | 惠州润众科技股份有限公司 | Circuit board spot welding equipment based on flue circulation mechanism |
-
2006
- 2006-05-26 CN CN 200610046690 patent/CN101077468A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101574616B (en) * | 2009-06-08 | 2011-09-07 | 叶力平 | Flue gas denitrification process for preparing ammonia with ammonium bicarbonate dry method by pyrolysis and system thereof |
| CN102114380B (en) * | 2009-12-31 | 2013-09-04 | 中国环境科学研究院 | Method for removing NOX in flue gas |
| CN106316531A (en) * | 2016-08-25 | 2017-01-11 | 辽宁津大肥业有限公司 | New application of coal-fired boiler fuel gas in the production of compound fertilizer |
| CN108905595A (en) * | 2018-09-20 | 2018-11-30 | 北京英斯派克科技有限公司 | A kind of flue gas in power station boiler Dry denitration method |
| CN114025495A (en) * | 2021-11-11 | 2022-02-08 | 惠州润众科技股份有限公司 | Circuit board spot welding equipment based on flue circulation mechanism |
| CN114025495B (en) * | 2021-11-11 | 2024-03-08 | 惠州润众科技股份有限公司 | Circuit board spot welding equipment based on flue circulation mechanism |
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