The exhaust gas pre-w flame boiler with the secondary air nozzle arranged on the arch and the air distribution method

A technology of secondary air and air nozzles, which is applied to coal-fired power station boilers, pre-exhaust W flame boilers and air distribution fields, can solve problems such as unreasonable distribution of secondary air volume, late ignition, and changes in boiler combustion organization.

Active Publication Date: 2021-07-02
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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  • The exhaust gas pre-w flame boiler with the secondary air nozzle arranged on the arch and the air distribution method
  • The exhaust gas pre-w flame boiler with the secondary air nozzle arranged on the arch and the air distribution method
  • The exhaust gas pre-w flame boiler with the secondary air nozzle arranged on the arch and the 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 components and connections are the same as those 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 the peripheral wind nozzles 8 of each row of double cyclone thick and thin pulverized coal burners 5 are arranged on the same straight line, and each row along the furnace width direction The exhaust gas nozzle 6 on the thick and thin pulverized coal burner 5 of a double cyclone is arranged in the center of the corresponding two thick pulverized coal airflow nozzles 9.

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

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Abstract

The exhaust gas pre-W flame boiler with the secondary air nozzle on the arch and the air distribution method, the present invention relates to a coal-fired power plant boiler, the invention is to solve the late ignition of the pulverized coal flow of the W flame boiler, the poor burnout and the arch , The distribution of the secondary air volume under the arch is unreasonable, resulting in a low level of staged combustion in the furnace and NO in the furnace X The amount of generation is relatively high, and the combustion organization of the boiler cannot be fundamentally changed, and the above problems cannot be completely solved. It also includes two rows of double-cyclone thick and thin pulverized coal burners, and the double-cyclone thick and thin coal pulverized The upper secondary air nozzle, the peripheral air nozzle and the dense pulverized coal air nozzle; the dense coal pulverized air nozzle is symmetrically arranged on both sides of the secondary air nozzle on the arch, and the exhaust gas nozzle is arranged in the secondary air nozzle on the arch, and the exhaust gas nozzle It is arranged close to the center surface of the furnace, and the exhaust air nozzle, the secondary air nozzle on the arch, two peripheral air nozzles and two dense coal powder airflow nozzles are all connected with the lower furnace. The invention belongs 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 Patents(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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