CN106556006A - A kind of method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler - Google Patents
A kind of method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler Download PDFInfo
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- CN106556006A CN106556006A CN201510620889.8A CN201510620889A CN106556006A CN 106556006 A CN106556006 A CN 106556006A CN 201510620889 A CN201510620889 A CN 201510620889A CN 106556006 A CN106556006 A CN 106556006A
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Abstract
A kind of method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler, it is characterised in that in 1 bugle of quadrangle tangential circle coal-burning boiler burner hearth（1）Bottom is installed by one or more layers wind powder burning spout（5）, in 1 bugle（1）One or more layers coal dust is installed and is burnt completely wind snout in top（6）；In 2 bugle of coal-burning boiler burner hearth of quadrangle tangential circle（2）Bottom is installed by one or more layers wind powder burning spout（5）, in 2 bugles（2）One or more layers coal dust is installed and is burnt completely wind snout in top（6）；In 3 bugle of coal-burning boiler burner hearth of quadrangle tangential circle（3）Bottom is installed by one or more layers wind powder burning spout（5）, in 3 bugles（3）One or more layers coal dust is installed and is burnt completely wind snout in top（6）；In 4 bugle of coal-burning boiler burner hearth of quadrangle tangential circle（4）Bottom is installed by one or more layers wind powder burning spout（5）；In 4 bugle of burner hearth（4）One or more layers coal dust is installed and is burnt completely wind snout in top（6）.
Description
Technical field
The present invention relates to a kind of method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler, refers in particular to the application during quadrangle tangential circle low nitrogen burning for fire coal boiler.
Background technology
The nitrogen oxides produced in coal-fired power plant of current China running are one of principal elements of atmospheric pollution, coal-fired plant boiler discharges substantial amounts of nitrogen oxides and further exacerbates ecological deterioration, one side nitrogen oxides can form photochemical fog destruction atmospheric environment with Hydrocarbon under certain condition together, serious harm human health, deteriorates environment for the survival of mankind；On the other hand, sulfur and nitrogen oxides are the principal element to form acid rain again. at present, there is large stretch of acid rain area all over the world. the development of China's acid rain is also abnormal rapid, and the ecosystem of serious acid precipitation and fragility makes China's economy sustain losses severely.
From national standard《Fossil-fuel power plant atmospheric pollutant emission standard》Issuing and implementation since, the existing coal-fired face-fired boiler DS NOx Est concentration in many coal-burning power plants can not meet the limit value of new standard.In order to reach the requirement of thermal power plant's DS NOx Est standard, denitration renovation technique route is proposed for coal-burning power plant's Process In A Tangential Firing oneself state and carrying out practically condition.Many power plant select to use:
1）Denitrating flue gas（SCR）Technology, is to be sprayed in high-temperature flue gas denitrification apparatus as denitrfying agent with ammonia, NOx is decomposed into N2 and H2O, but such technical difficulty is big.
2) low-NO_x combustion technology is classified, is the process of coal dust firing is completed stage by stage by air classification or fuel staging, but such class skills classification depth is inadequate, effect is poor, operation to boiler requires complicated, impact boiler combustion efficiency, it is impossible to reach national existing discharge standard.
Therefore, combustion with reduced pollutants technology or device are developed, the discharge capacity for reducing nitrogen oxides is one of current matter of utmost importance urgently to be resolved hurrily.
The content of the invention
For the problems referred to above, it is an object of the invention to provide a kind of method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler.
To reach object above, the solution of the present invention is：
A kind of method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler, it is characterised in that in 1 bugle of quadrangle tangential circle coal-burning boiler burner hearth（1）Bottom is installed by one or more layers wind powder burning spout（5）, in 1 bugle（1）One or more layers coal dust is installed and is burnt completely wind snout in top（6）；In 2 bugle of coal-burning boiler burner hearth of quadrangle tangential circle（2）Bottom is installed by one or more layers wind powder burning spout（5）, in 2 bugles（2）One or more layers coal dust is installed and is burnt completely wind snout in top（6）；In 3 bugle of coal-burning boiler burner hearth of quadrangle tangential circle（3）Bottom is installed by one or more layers wind powder burning spout（5）, in 3 bugles（3）One or more layers coal dust is installed and is burnt completely wind snout in top（6）；In 4 bugle of coal-burning boiler burner hearth of quadrangle tangential circle（4）Bottom is installed by one or more layers wind powder burning spout（5）；In 4 bugle of burner hearth（4）One or more layers coal dust is installed and is burnt completely wind snout in top（6）.
Further, coal dust is through wind powder burning spout（5）Before, shifting to an earlier date ignition in the environment of anoxia, produce a large amount of carbon monoxides, carbon monoxide is in quadrangle tangential circle coal-burning boiler bottom main burning area（7）Suppress the generation with nitrogen oxides reduction, in quadrangle tangential circle coal-burning boiler burner hearth reducing zone（9）The nitrogen oxides for having generated are reduced further, imperfect combustion coal dust and carbon monoxide are in quadrangle tangential circle coal-burning boiler burner hearth top burnt zone（8）Fully burn.
Further, reducing zone is between main burning area and burnt zone, and distance is between 4-8m.
Further, quadrangle tangential circle coal-burning boiler burner hearth main burning area（7）The air capacity of institute's proportioning is burnt required air quantity completely less than fuel.
Further, the coal-burning boiler burner hearth top burnt zone of corner tangential firing（8）Institute's proportioning air capacity is burnt required air quantity completely more than or equal to fuel.
Further, quadrangle tangential circle coal-burning boiler integrated air surplus coefficient keeps constant with original design.
The present invention principle and feature be：
Make coal dust that high temperature pyrolysis are subject in the environment of severe depletion of oxygen before entering inlet air powder burning spout, ignition, increases the burnout rate of coal dust in advance, produces substantial amounts of carbon monoxide and enters quadrangle tangential circle coal-burning boiler burner hearth bottom primary zone（7）, and the air surplus coefficient of institute's proportioning is less than 1, so as to suppress the generation with nitrogen oxides reduction, in quadrangle tangential circle coal-burning boiler reducing zone（9）Carbon monoxide further reduces the nitrogen oxides for having generated, in quadrangle tangential circle coal-burning boiler burner hearth top burnt zone（8）Institute's proportioning air surplus coefficient is more than or equal to 1, it is ensured that coal dust is in burnt zone（8）Fully burn.
The characteristics of the art of this patent combines classification low-NO_x combustion technology, realizes deeply staged combustion, it is to avoid coal dust firing shortcoming not to the utmost；While nitrogen oxides are reduced, boiler flyash carbon content is reduced；With high content of technology, technical difficulty is less, simple to operate, boiler regulation and control is required little, can adapt to the change of boiler working condition and ature of coal；In sum, the technology solves a current gas denitrifying technology, classification low-NO_x combustion technology key, general character difficult problem in terms of coal-fired electric generation furnace reduces nitrogen oxides.
Description of the drawings：
Fig. 1 is principle of the invention schematic diagram
Specific embodiment
:
The method of a kind of reduction quadrangle tangential circle nitrogen oxides from coal-fired boiler as shown in Figure 1, it is characterised in that in 1 bugle of quadrangle tangential circle coal-burning boiler burner hearth（1）Bottom is installed by one or more layers wind powder burning spout（5）, in 1 bugle（1）One or more layers coal dust is installed and is burnt completely wind snout in top（6）；In 2 bugle of coal-burning boiler burner hearth of quadrangle tangential circle（2）Bottom is installed by one or more layers wind powder burning spout（5）, in 2 bugles（2）One or more layers coal dust is installed and is burnt completely wind snout in top（6）；In 3 bugle of coal-burning boiler burner hearth of quadrangle tangential circle（3）Bottom is installed by one or more layers wind powder burning spout（5）, in 3 bugles（3）One or more layers coal dust is installed and is burnt completely wind snout in top（6）；In 4 bugle of coal-burning boiler burner hearth of quadrangle tangential circle（4）Bottom is installed by one or more layers wind powder burning spout（5）；In 4 bugle of burner hearth（4）One or more layers coal dust is installed and is burnt completely wind snout in top（6）.
Enter inlet air powder burning spout in coal dust（5）Before, high temperature pyrolysis are subject in the environment of severe depletion of oxygen, in advance ignition, increase the burnout rate of coal dust, produced substantial amounts of carbon monoxide and enter quadrangle tangential circle coal-burning boiler burner hearth bottom primary zone（7）, and the air surplus coefficient of institute's proportioning is less than 1, so as to suppress the generation with nitrogen oxides reduction, in quadrangle tangential circle coal-burning boiler reducing zone（9）Carbon monoxide further reduces the nitrogen oxides for having generated, in quadrangle tangential circle coal-burning boiler burner hearth top burnt zone（8）Institute proportioning air surplus coefficient is more than or equal to 1, it is ensured that coal dust burns, and boiler integrated air surplus coefficient keeps constant with original design, it is ensured that the efficiency of combustion of boiler.
The present invention principle and feature be：The characteristics of combining classification low-NO_x combustion technology, realizes deeply staged combustion, it is to avoid coal dust firing shortcoming not to the utmost；While nitrogen oxides are reduced, boiler flyash carbon content is reduced；With high content of technology, technical difficulty is less, simple to operate, boiler regulation and control is required little, can adapt to the change of boiler working condition and ature of coal；In sum, the technology solves a current gas denitrifying technology, classification low-NO_x combustion technology key, general character difficult problem in terms of coal-fired electric generation furnace reduces nitrogen oxides.
Enforcement above; only to general description of the invention; not the scope of the present invention is defined; on the premise of without departing from design spirit of the present invention; anyone various modifications made to technical scheme and improvement, all should fall in the protection domain of claims of the present invention determination.
Claims (6)
1. it is a kind of reduce quadrangle tangential circle nitrogen oxides from coal-fired boiler method, it is characterised in that in 1 bugle of quadrangle tangential circle coal-burning boiler burner hearth（1）Bottom is installed by one or more layers wind powder burning spout（5）, in 1 bugle（1）One or more layers coal dust is installed and is burnt completely wind snout in top（6）；In 2 bugle of coal-burning boiler burner hearth of quadrangle tangential circle（2）Bottom is installed by one or more layers wind powder burning spout（5）, in 2 bugles（2）One or more layers coal dust is installed and is burnt completely wind snout in top（6）；In 3 bugle of coal-burning boiler burner hearth of quadrangle tangential circle（3）Bottom is installed by one or more layers wind powder burning spout（5）, in 3 bugles（3）One or more layers coal dust is installed and is burnt completely wind snout in top（6）；In 4 bugle of coal-burning boiler burner hearth of quadrangle tangential circle（4）Bottom is installed by one or more layers wind powder burning spout（5）；In 4 bugle of burner hearth（4）One or more layers coal dust is installed and is burnt completely wind snout in top（6）.
2. a kind of method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler as claimed in claim 1, it is characterised in that coal dust is burning spout through wind powder（5）Before, shifting to an earlier date ignition in the environment of anoxia, produce a large amount of carbon monoxides, carbon monoxide is in quadrangle tangential circle coal-burning boiler bottom main burning area（7）Suppress the generation with nitrogen oxides reduction, in quadrangle tangential circle coal-burning boiler burner hearth reducing zone（9）The nitrogen oxides for having generated are reduced further, imperfect combustion coal dust and carbon monoxide are in quadrangle tangential circle coal-burning boiler burner hearth top burnt zone（8）Fully burn.
3. a kind of method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler as claimed in claim 2, it is characterised in that reducing zone is between main burning area and burnt zone, and distance is between 4-8m.
4. a kind of method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler as claimed in claim 1, it is characterised in that quadrangle tangential circle coal-burning boiler burner hearth main burning area（7）The air capacity of institute's proportioning is burnt required air quantity completely less than fuel.
5. a kind of as claimed in claim 1 method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler, it is characterised in that the coal-burning boiler burner hearth top burnt zone of corner tangential firing（8）Institute's proportioning air capacity is burnt required air quantity completely more than or equal to fuel.
6. a kind of method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler as claimed in claim 1, it is characterised in that quadrangle tangential circle coal-burning boiler integrated air surplus coefficient keeps constant with original design.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510620889.8A CN106556006A (en) | 2015-09-25 | 2015-09-25 | A kind of method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler |
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| CN201510620889.8A CN106556006A (en) | 2015-09-25 | 2015-09-25 | A kind of method for reducing quadrangle tangential circle nitrogen oxides from coal-fired boiler |
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Application publication date: 20170405 |
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