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4D multidimensional low-nitrogen combustor

A low-nitrogen burner, multi-dimensional technology, applied in the direction of using a variety of fuel combustion, combustion methods, combustion types, etc.

Inactive Publication Date: 2015-11-25
WUHAN TIANHE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a 4D multi-dimensional low-nitrogen burner, which uses 4D (that is, four-dimensional) low-nitrogen combustion technology to solve the problem of the limitation of the air mode used for combustion, and to oxidize the nitrogen in the coal-fired boiler The emission value of pollutants is effectively reduced to more than 50%, so as to meet the needs of actual production work

Method used

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Examples

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Effect test

Embodiment 1

[0146] A 4D multi-dimensional low-nitrogen burner, including the boiler furnace, divides the air required for combustion into four stages along the vertical height of the boiler furnace, the first stage is the main burner area, and the second stage is the exhaust air close to the top of the main burner , the third stage is the low-level overburning air located at a certain height above the main burner, and the fourth stage is the high-level overburning air located at a certain height above the low-level overburning air. Three air staged combustions are carried out in the vertical height direction; while along the furnace horizontal The section direction divides the airflow from the inside to the outside into thick coal powder airflow, light coal powder airflow and wall-adhering airflow, and implements secondary air staged combustion in the horizontal direction; at the same time, the reduction and burnout time of the flue gas in the combustion area of ​​the furnace is controlled ...

Embodiment 2

[0148] A 4D multi-dimensional low-nitrogen burner, the same as Embodiment 1, the difference is that in the four-stage structure of the furnace along the vertical direction, the first stage is the main burner area, and the second stage is located above the main burner. The OFA burn-off air area, the third level is the low-level OFA separation burn-off wind area, and the third level is the high-level SOFA separation burn-off wind area above the low level OFA.

Embodiment 3

[0150] A 4D multi-dimensional low-nitrogen burner, the same as Embodiment 2, the difference is that in the three-stage airflow from the inside to the outside of the furnace along the horizontal direction, the first stage is the dense coal powder airflow area, and the second stage is the light Pulverized coal air flow area, the third-level wall-attached secondary air area.

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Abstract

The invention relates to a 4D multidimensional low-nitrogen combustor. The combustor comprises a boiler furnace. Along the vertical direction of the boiler furnace, the air for combustion is divided into four grades: the first grade is a main combustor area, the second grade is over fire air next to the top of the main combustor, the third grade is low-position over fire air, which is higher than the main combustor, and the fourth grade is high-position over fire air, which is higher than the low-position over fire air. In the vertical direction, the air is combusted in three grades. Along the horizontal cross section direction of furnace, from inner to outer, the air flow is divided into condensed coal powder air flow, diluted coal powder air flow, and flow of air close to the wall; and in the horizontal direction, the air is combusted in two grades. At the same time, the reduction and burn-out time of flue gas in the combustion area in furnace are controlled so as to reduce the discharge of oxynitride and minimize the influence on boiler burning efficiency. The provided combustor can solve the problem of limitation influence of combustion air mode, effectively reduce the discharge of oxynitride in coal-fired boiler by 50% or more, and effectively reduce the discharge of oxynitride in old boiler improvement.

Description

technical field [0001] The invention belongs to the technical field of low-nitrogen combustion of pulverized coal boilers, and relates to a combustion technology for reducing the emission of nitrogen oxides from pulverized coal boilers, in particular to a 4D multi-dimensional low-nitrogen burner. Background technique [0002] my country is a developing country that uses coal as the main energy source. Coal resources account for about 75% of my country's total energy production and consumption. Statistics provided by the China Coal Industry Association show that in 2012, the national raw coal output reached 3.65 billion tons, of which Coal used in thermal power generation accounts for about 50% of raw coal output, and by 2020 it is estimated that the annual coal used in power generation will reach 2 billion tons. In the next 20 to 30 years, coal power will still account for about 60%, and this situation will not change for decades. [0003] During the combustion of coal, a la...

Claims

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Application Information

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IPC IPC(8): F23C5/08F23C7/00
Inventor 赖友祥庄伟刘革伟
Owner WUHAN TIANHE TECH
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