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Exhaust steam front-loading W flame boiler with on-arch secondary air spraying openings and air distribution method

A technology for secondary air and air nozzles, which is applied to coal-fired power station boilers, exhaust gas front W-flame boilers and air distribution fields, can solve the problem of changing the combustion organization mode of the boiler, unreasonable secondary air volume distribution, and low level of grading combustion. To achieve the effect of prolonging the burnout distance, promoting the burnout of pulverized coal, and strengthening the level of graded combustion

Active Publication Date: 2020-08-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of late ignition of pulverized coal flow in W flame boilers, poor burnout and unreasonable distribution of secondary air volume above and below the arch, resulting in low graded combustion level in the furnace and NO in the furnace. X The amount of generation is high, and the combustion organization of the boiler cannot be fundamentally changed, and the above problems cannot be completely solved. Then, the exhaust gas pre-W flame boiler and the air distribution method with the secondary air nozzle on the arch are provided.

Method used

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  • Exhaust steam front-loading W flame boiler with on-arch secondary air spraying openings and air distribution method
  • Exhaust steam front-loading W flame boiler with on-arch secondary air spraying openings and air distribution method
  • Exhaust steam front-loading W flame boiler with on-arch secondary air spraying openings and air distribution method

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specific Embodiment approach 1

[0025] Specific implementation mode one: combine figure 2 and Figure 4To illustrate this embodiment, this embodiment arranges the exhaust gas front W flame boiler with the secondary air nozzle on the arch, which includes the upper furnace 1, the lower furnace 2, the front furnace arch 3 and the rear furnace arch 4, the upper furnace 1, the front furnace Furnace arch 3, lower hearth 2 and rear furnace arch 4 constitute the furnace body, which also includes two rows of double cyclone thick and thin pulverized coal burners 5, and each row of double cyclone thick and thin pulverized coal burners 5 includes multiple double cyclone thick and thin coal Pulverized coal burner 5, a plurality of thick and thin pulverized coal burners 5 with double cyclones are symmetrically arranged in a line and installed on the front furnace arch 3 and the rear furnace arch 4, and the double cyclone thick and thin pulverized coal burners 5 include exhaust gas nozzles 6, The secondary air nozzle 7 o...

specific Embodiment approach 2

[0026] Specific implementation mode two: combination Figure 4 To illustrate this embodiment, the cross-section of the exhaust gas nozzle 6 in this embodiment is circular, and the area of ​​the exhaust gas nozzle 6 is equal to the cross-sectional area of ​​a single exhaust gas pipeline on the double-cyclone thick-lean pulverized coal burner 5 .

[0027] Other compositions and connections are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Specific implementation mode three: combination Figure 4 To illustrate this embodiment, in this embodiment, along the depth direction of the furnace, the dense pulverized coal airflow nozzles 9 and exhaust gas nozzles 6 of each row of double cyclone thick and thin pulverized coal burners 5 are arranged on the same straight line, along the width direction of the furnace. The exhaust gas nozzle 6 on each double-cyclone thick and thin pulverized coal burner 5 is arranged in the center of the corresponding two dense pulverized coal gas flow nozzles 9 .

[0029] Other compositions and connections are the same as those in the second embodiment.

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Abstract

The invention discloses an exhaust steam front-loading W flame boiler with an on-arch secondary air spraying openings and an air distribution method and relates to a coal-fired power plant. The exhaust steam front-loading W flame boiler with the on-arch secondary air spraying opening and the air distribution method aim at solving the problems that W flame boiler coal dust airflow fire catching islate, the burnout is poor and the on-arch and under-arch secondary air volume distribution is not reasonable, and consequently the classification combustion level in the boiler is low, the NOX generation amount in the boiler is high, the combustion organization manner of the boiler cannot be changed fundamentally, and the above problems cannot be thoroughly solved. The exhaust steam front-loadingW flame boiler further comprises two rows of double-cyclone-cylinder dense-lean coal dust combustors, and each double-cyclone-cylinder dense-lean coal dust combustor comprises an exhaust steam spraying opening, an on-arch secondary air spraying opening, surrounding air spraying openings and thick coal dust airflow spraying openings, wherein the thick coal dust airflow spraying openings are symmetrically formed in the two sides of the on-arch secondary air spraying opening, the exhaust steam spraying opening is formed in the on-arch secondary air spraying opening, the exhaust steam spraying opening is arranged close to the center face of a hearth, and the exhaust steam spraying opening, the on-arch secondary air spraying opening, the two surrounding air spraying openings and the two thick coal dust airflow spraying openings communicate with the lower hearth. The exhaust steam front-loading W flame boiler with the on-arch secondary air spraying opening and the air distribution method belong to the technical field of boiler combustion.

Description

technical field [0001] The invention relates to a boiler for a coal-fired power station, in particular to a W-flame boiler with a pre-exhaust gas secondary air nozzle arranged on an arch and an air distribution method, belonging to the technical field of boiler combustion. Background technique [0002] Thermal power generation refers to a power generation method that uses the heat energy generated by combustibles during combustion and converts it into electrical energy through a power generation device. According to the fuel used, it is divided into coal-fired power generation, oil-fired power generation, and gas-fired power generation. Among them, coal-fired power generation is the main power generation method in China. As one of the three major main equipments of thermal power plants, power plant boilers develop along with the development of China's thermal power industry. However, NOx, dust and other pollutants are easy to be produced in the process of burning coal, caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C7/00F23C5/08F23L9/00F23K3/02
CPCF23C5/08F23C7/002F23K3/02F23L9/00
Inventor 杜贺李争起谭紫莹郑智巍曾令艳陈智超朱群益
Owner HARBIN INST OF TECH
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