CN1803257A - Method and special system for removing nitrogen oxide from flume gas of coal-burning power station - Google Patents
Method and special system for removing nitrogen oxide from flume gas of coal-burning power station Download PDFInfo
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- CN1803257A CN1803257A CN 200510045653 CN200510045653A CN1803257A CN 1803257 A CN1803257 A CN 1803257A CN 200510045653 CN200510045653 CN 200510045653 CN 200510045653 A CN200510045653 A CN 200510045653A CN 1803257 A CN1803257 A CN 1803257A
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- nitrogen oxide
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Abstract
The invention discloses a nitrogen oxide removal method of coal-fired power station, which comprises the following steps: taking amino material as reducer; spraying the amino material through the top of coal-fired furnace cavity to react with nitrogen oxide from burning coal; removing 35-45 nitrogen oxide in the smoke; charging the incomplete reacting amino material in the reactor; proceeding complete reaction of amino material and nitrogen oxide again; removing the nitrogen oxide in the smoke. The invention simplifies the system with stable operational property and strong fitness reducer, which improves the stripping efficiency more than 90 percent.
Description
Technical field:
The present invention relates to a kind of coal fired power plant flue gas and remove the nitrogen oxide technology, this technology is one of the technology that is applied to the emission control process of coal-fired station's exhaust pollutant nitrogen oxide, be suitable for having now, newly-built large, medium and small unit remove nitrogen oxide technological transformation, construction project.
Background technology:
Nitrogen oxide is one of the formation of acid rain, major pollutants of problem of environmental pollution such as damage the ozone layer.In the energy resource structure of China, fire coal accounts for more than 70% always for a long time, in foreseeable future, China is that the energy resource structure of main energy sources will continue to increase along with increasing of national economy with the coal, using in a large number of coal produces a large amount of pollutants such as nitrogen oxide, and at present, China's nitrogen oxide annual emissions is above 1,500 ten thousand tons, have a strong impact on the sustainable development of Chinese national economy, and make the Chinese government face very big international pressure.For realizing the sustainable development of Chinese national economy, improve environmental aspect of China and the people's living environment, China still is in the starting stage aspect the emission control of coal fired power plant flue gas NOx, and domestic research at gas denitrifying technology only only limits to aspect the mechanism.China's coal fired power plant does not still adopt equipment for denitrifying flue gas at present, does not grasp the design of large-scale equipment for denitrifying flue gas, the technology of manufacturing yet.
Flue gas removes nitrogen oxide and generally adopt low NOx combusting technology on the coal fired power generation unit of western developed country, and gas denitrifying technology also is tending towards ripe and is applied gradually.As: Japan begins the commercial SCR of application gas denitrifying technology the beginning of the eighties from eighties of last century, Germany begins the eighties to adopt the SCR gas denitrifying technology at the coal-fired power station boiler of middle low sulfur content from eighties of last century, and the U.S. begins in use high-sulphur coal-burning boiler from eighties of last century to control NO the nineties
xThe research of the SCR demonstrative project of discharging and commercial the application.To eighties of last century beginning of the nineties, the SCR equipment for denitrifying flue gas installed capacity of Japan and Germany has surpassed 30GW respectively, and the maximum installed capacity of SCR equipment for denitrifying flue gas electricity generation boiler unit has at present surpassed 1000MW.
Summary of the invention:
The objective of the invention is to propose a kind of removal of nitrogen oxide efficient height that has, little to equipment corrosion, do not produce secondary pollution, and broad application temperature range, applicability is stronger, and the flue gas that range of application is wider removes the nitrogen oxide technology.
The technology that the present invention relates to is that flue gas removes a kind of of nitrogen oxide, and the basic principle of this technology is based on external SCR technology and SNCR technology.Particularly, the invention provides the method that a kind of coal fired power plant flue gas removes nitrogen oxide, is reducing agent with amino material, it is characterized in that:
---spray into the nitrogen oxide partial reaction that produces in amino material and the coal combustion in the coal-burning boiler upper furnace, remove in the flue gas 35～45% nitrogen oxide;
---contain not that the flue gas of the amino material of complete reaction enters reactor, at catalyst surface, amino material again with coal combustion in the nitrogen oxide complete reaction that produces, remove the nitrogen oxide in the flue gas.
Coal fired power plant flue gas of the present invention removes in the method for nitrogen oxide, removes in the process of nitrogen oxide at described partial reaction, requires reaction temperature at 900～1200 ℃.
Coal fired power plant flue gas of the present invention removes in the method for nitrogen oxide, removes in the process of nitrogen oxide in described complete reaction, and catalyst system therefor can be selected honeycomb type grid column titanium manganese Si catalyst, 280～420 ℃ of reaction temperatures for use.
Coal fired power plant flue gas of the present invention removes in the method for nitrogen oxide, describedly contains not that the flue gas of the amino material of complete reaction preferably enters reactor with even velocity of flow.
Coal fired power plant flue gas of the present invention removes in the method for nitrogen oxide, and described amino material is preferably liquefied ammonia or liquid urea.
Coal fired power plant flue gas of the present invention removes in the method for nitrogen oxide, and containing concentration in the flue gas that described coal-fired power station boiler burning generates is 300～1000mg/m
3Nitrogen oxide.The addition of amino material with flue gas in the nitrogen oxide complete reaction generate nitrogen and be advisable.
The present invention also provides a kind of coal fired power plant flue gas of special said method to remove the nitrogen oxide system, it is characterized in that: this system is made of amino material adding apparatus (1), boiler (2), distributor (3), fairing (4), reactor (5), air preheater (6); Distributor (3) is arranged in boiler (2) upper furnace, links to each other with amino material adding apparatus (1); Boiler (2), fairing (4), reactor (5) are linked in sequence with air preheater (6).
Coal fired power plant flue gas of the present invention removes in the nitrogen oxide system, and described distributor (3) is any device that amino material can be disperseed on its jet face equably, and require this device indeformable at 800～1400 ℃ of high temperature, never degenerate.Can be the existing conventional design apparatus.
Coal fired power plant flue gas of the present invention removes in the nitrogen oxide system, and described fairing (4) reduces resistance for any flue gas that can make turning to when flowing, and makes smoke distribution even, reposefully the device of Liu Donging.Can be the existing conventional design apparatus.
Coal fired power plant flue gas of the present invention removes in the nitrogen oxide system, fixes 1～3 layer of honeycomb type grid column titanium manganese Si catalyst in the described reactor (5).
The present invention has following advantage:
(1) removal of nitrogen oxide efficient height can reach 90% above removal efficiency;
(2) adaptive temperature wide ranges;
(3) reducing agent is in strict accordance with waiting quantitative response mol ratio to add, and there is not the excessive problem of amino material in the degree that reacts completely height;
(4) adopt and do not have V in the catalyst
2O
5Composition, another dusty gas SO in the flue gas
2Can not be oxidized to SO
3, there is not corrosivity in equipment;
(5) reducing agent is in strict accordance with waiting quantitative response mol ratio to add the degree that reacts completely height, non-secondary pollution deposits yields.
In a word, system of the present invention is simple, operational stability good, reducing agent adaptability strong, removal of nitrogen oxide efficient height, can reach more than 90%.No matter from the production capacity aspect, still from technological process, the kind of production equipment and quantitative aspects all are far superior to prior art, therefore have more application prospects.
Description of drawings:
Fig. 1 connects signal for present device; (1) amino material adding apparatus among the figure, (2) boiler, (3) distributor, (4) fairing, (5) reactor, (6) air preheater.
The specific embodiment:
The basic process of method that the coal fired power plant flue gas removes nitrogen oxide is as follows:
1) contain the pollution gas nitrogen oxide in the flue gas that the coal-fired power station boiler burning generates, concentration is 300～1000mg/m
3
2) compressed air disperses amino material, amino material is sprayed into 900～1200 ℃ of zones, boiler furnace top equably, 35～45% nitrogen oxide and amino substance qualitative response in this zone flue gas through a special distributor;
3) flue gas that contains amino material and nitrogen oxide enters reactor before the air preheater through a kind of fairing with even velocity of flow;
4) be 280～420 ℃ of zones and be equipped with in a kind of reactor of special catalyst that in temperature nitrogen oxide and amino material react at catalyst surface;
5) behind the reactor internal reaction, the flue gas that removes nitrogen oxide enters air preheater, and the concentration of nitrogen oxide is 30～100mg/Nm in the flue gas
3
Adopt the equipment shown in the accompanying drawing 1 to connect, idiographic flow is described below: amino material is added by amino material adding apparatus (1) and amino material is joined equably in the flue gas of boiler (2) upper furnace by distributor (3) that part reaction of nitrogen oxides, unreacted amino material enter reactor (5) with flue gas through fairing (4) in flue gas, after the catalyst surface reaction in reactor (5) of amino material and nitrogen oxide, flue gas enters air preheater (6).
Embodiment 1
Certain coal-fired power station boiler discharging flue gas 17 ten thousand stere/hour, amount of nitrogen oxides 400mg/Nm in the flue gas
3, the built-in one deck catalyst of reactor is reserved two-layer position.Idiographic flow is:
Amino material is added by amino material adding apparatus (1) and amino material is joined equably in the flue gas of boiler furnace top (2) by special distributor (3) that part reaction of nitrogen oxides, unreacted amino material enter reactor (5) with flue gas through fairing (4) in flue gas, after the catalyst surface reaction in reactor (5) of amino material and nitrogen oxide, flue gas enters air preheater (6).The design removal of nitrogen oxide efficient of this system is 85%.
Embodiment 2
Certain coal-fired power station boiler discharging flue gas 48.5 ten thousand stere/hour, amount of nitrogen oxides 700mg/Nm in the flue gas
3, the built-in two layers of catalyst of reactor are reserved one deck position.Idiographic flow is:
Amino material is added by amino material adding apparatus (1) and amino material is joined equably in the flue gas of boiler furnace top (2) by special distributor (3) that part reaction of nitrogen oxides, unreacted amino material enter reactor (5) with flue gas through fairing (4) in flue gas, after the catalyst surface reaction in reactor (5) of amino material and nitrogen oxide, flue gas enters air preheater (6).The design removal of nitrogen oxide efficient of this system is 90%.
Claims (10)
1, a kind of coal fired power plant flue gas removes the method for nitrogen oxide, is reducing agent with amino material, it is characterized in that:
---spray into the nitrogen oxide partial reaction that produces in amino material and the coal combustion in the coal-burning boiler upper furnace, remove in the flue gas 35～45% nitrogen oxide;
---contain not that the flue gas of the amino material of complete reaction enters reactor, at catalyst surface, amino material again with coal combustion in the nitrogen oxide complete reaction that produces, remove the nitrogen oxide in the flue gas.
2, remove the method for nitrogen oxide according to the described coal fired power plant flue gas of claim 1, it is characterized in that: remove in the process of nitrogen oxide at described partial reaction, reaction temperature is at 900～1200 ℃.
3, remove the method for nitrogen oxide according to the described coal fired power plant flue gas of claim 1, it is characterized in that: remove in the process of nitrogen oxide in described complete reaction, catalyst system therefor is a honeycomb type grid column titanium manganese Si catalyst, 280～420 ℃ of reaction temperatures.
4, remove the method for nitrogen oxide according to the described coal fired power plant flue gas of claim 1, it is characterized in that: describedly contain not that the flue gas of the amino material of complete reaction enters reactor with even velocity of flow.
5, remove the method for nitrogen oxide according to the described coal fired power plant flue gas of claim 1, it is characterized in that: described amino material is liquefied ammonia or liquid urea.
6, remove the method for nitrogen oxide according to the described coal fired power plant flue gas of claim 1, it is characterized in that: containing concentration in the flue gas that described coal-fired power station boiler burning generates is 300～1000mg/m3 nitrogen oxide.
7, a kind of coal fired power plant flue gas that is specifically designed to the described method of one of claim 1～6 removes the nitrogen oxide system, it is characterized in that: this system is made of amino material adding apparatus (1), boiler (2), distributor (3), fairing (4), reactor (5), air preheater (6); Distributor (3) is arranged in boiler (2) upper furnace, links to each other with amino material adding apparatus (1); Boiler (2), fairing (4), reactor (5) are linked in sequence with air preheater (6).
8, remove the nitrogen oxide system according to the described coal fired power plant flue gas of claim 7, it is characterized in that: the device of described distributor (3) for amino material is disperseed on its jet face equably, and indeformable at 800～1400 ℃ of high temperature, never degenerate.
9, remove the nitrogen oxide system according to the described coal fired power plant flue gas of claim 7, it is characterized in that: described fairing (4) reduces resistance for making flue gas turning to when flowing, and makes smoke distribution even, reposefully the device of Liu Donging.
10, remove the nitrogen oxide system according to the described coal fired power plant flue gas of claim 7, it is characterized in that: fix 1～3 layer of honeycomb type grid column titanium manganese Si catalyst in the described reactor (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100456532A CN100377762C (en) | 2005-01-13 | 2005-01-13 | Method and special system for removing nitrogen oxide from flume gas of coal-burning power station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100456532A CN100377762C (en) | 2005-01-13 | 2005-01-13 | Method and special system for removing nitrogen oxide from flume gas of coal-burning power station |
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| CN1803257A true CN1803257A (en) | 2006-07-19 |
| CN100377762C CN100377762C (en) | 2008-04-02 |
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| CNB2005100456532A Expired - Fee Related CN100377762C (en) | 2005-01-13 | 2005-01-13 | Method and special system for removing nitrogen oxide from flume gas of coal-burning power station |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101773781A (en) * | 2010-03-23 | 2010-07-14 | 浙江大学 | Method for realizing SNCR and SCR combined denitration by using coal-fired boiler |
| CN101940876A (en) * | 2010-05-21 | 2011-01-12 | 中国神华能源股份有限公司 | Denitration method for smoke |
| CN101940880A (en) * | 2010-05-21 | 2011-01-12 | 中国神华能源股份有限公司 | Smoke denitration method |
| CN102166473A (en) * | 2011-03-11 | 2011-08-31 | 北京洛卡环保技术有限公司 | Boiler flue gas denitration system and process |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4793981A (en) * | 1986-11-19 | 1988-12-27 | The Babcock & Wilcox Company | Integrated injection and bag filter house system for SOx -NOx -particulate control with reagent/catalyst regeneration |
| JPH05103951A (en) * | 1991-10-14 | 1993-04-27 | Ebara Corp | Exhaust gas-denitrating method and device therefor |
| JPH067639A (en) * | 1992-04-28 | 1994-01-18 | Mitsubishi Heavy Ind Ltd | Method for denitrifying waste combustion gas |
| JP3491142B2 (en) * | 1999-04-16 | 2004-01-26 | Ｊｆｅエンジニアリング株式会社 | Exhaust gas treatment method |
-
2005
- 2005-01-13 CN CNB2005100456532A patent/CN100377762C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101773781A (en) * | 2010-03-23 | 2010-07-14 | 浙江大学 | Method for realizing SNCR and SCR combined denitration by using coal-fired boiler |
| CN101773781B (en) * | 2010-03-23 | 2012-07-18 | 浙江大学 | Method for realizing SNCR and SCR combined denitration by using coal-fired boiler |
| CN101940876A (en) * | 2010-05-21 | 2011-01-12 | 中国神华能源股份有限公司 | Denitration method for smoke |
| CN101940880A (en) * | 2010-05-21 | 2011-01-12 | 中国神华能源股份有限公司 | Smoke denitration method |
| CN101940880B (en) * | 2010-05-21 | 2012-06-27 | 中国神华能源股份有限公司 | Smoke denitration method |
| CN102166473A (en) * | 2011-03-11 | 2011-08-31 | 北京洛卡环保技术有限公司 | Boiler flue gas denitration system and process |
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|---|---|
| CN100377762C (en) | 2008-04-02 |
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