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Method and apparatus for improving primary air breeze gas flow temperature of W-shaped flame boiler

A technology of pulverized coal and flame is applied in the field of improving primary air auxiliary hot air of W-type flame boiler, which can solve the problems of stable combustion and poor ignition ability, and achieve the effects of easy ignition, increased air temperature and stable combustion.

Active Publication Date: 2011-06-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for increasing the temperature of the primary air pulverized coal flow of a W-type flame boiler, so as to solve the problem that the existing W-type flame combustion technology has poor combustion stability and ignition ability during use.

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  • Method and apparatus for improving primary air breeze gas flow temperature of W-shaped flame boiler
  • Method and apparatus for improving primary air breeze gas flow temperature of W-shaped flame boiler

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specific Embodiment approach 1

[0008] Specific implementation mode one: combine figure 1 Describe this embodiment, the method of this embodiment is finished like this: auxiliary air is drawn out by hot air pipe 5, and auxiliary air temperature is 320 ℃~370 ℃ (the air temperature is the same as the air temperature of secondary air), and auxiliary air passes through The fan 4 and the auxiliary air duct 6 pass into the primary air duct 3 before the air inlet port of the burner 2, and mix with the primary air pulverized coal with a wind temperature of 100°C-110°C and a wind speed of 22.0-23.0m / s , the auxiliary air volume passed into the primary air pipe 3 is adjusted by the valve 7 arranged on the auxiliary air pipe 6, the angle between the direction of the auxiliary air passed into the primary air pipe 3 and the flow direction of the primary air pulverized coal α is 25°-35°, the auxiliary air volume passed into the primary air duct 3 accounts for 19%-21% of the total primary air volume, and the air temperatur...

specific Embodiment approach 2

[0009] Specific implementation mode two: combination figure 1 Describe this embodiment, the difference between this embodiment and specific embodiment 1 is: the auxiliary air in this embodiment is drawn out from the hot air pipe 5, the temperature of the auxiliary air is 320°C, and the auxiliary air passes through the induced draft fan 4 and the auxiliary air pipe 6 It is passed into the primary air pipe 3 before the air inlet port of the burner 2, and mixed with the primary air pulverized coal with a wind temperature of 105°C and a wind speed of 22.4m / s, and the auxiliary air volume passed into the primary air pipe 3 Through the adjustment of the valve 7 arranged on the auxiliary air pipe 6, the included angle α between the direction of the auxiliary air flowing into the primary air pipe 3 and the flow direction of the primary air pulverized coal is 30°, which is relatively small to prevent the occurrence of gas The sealing phenomenon ensures the normal delivery of the primar...

specific Embodiment approach 3

[0010] Specific implementation mode three: combination figure 1 Describe this embodiment, the difference between this embodiment and specific embodiment 1 or 2 is: the auxiliary air volume that passes into the primary air duct 3 of this embodiment accounts for 20% of the total primary air volume, effectively realizing the pulverized coal air flow caught fire in time. But at the same time, it should be noted that the auxiliary air cannot be increased blindly. When too much auxiliary air is fed in, the primary wind speed will be very high. If the primary wind speed is too high, the resistance in the primary air pipe will increase, which will affect the output of the coal mill. .

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Abstract

A method and a device for improving the primary air pulverized coal airflow temperature of a W-shaped flame boiler relate to the method and the device for improving primary air auxiliary hot air of the W-shaped flame boiler. The method and the device are designed against the problems of poor combustion stability and poor ignition capacity of the W-shaped flame combustion technology. The method is as follows: auxiliary air is led out by a hot air pipe, the air temperature is 320-370 DEG C, the auxiliary air is introduced into a primary air pipe before entering a burner and mixed with primary air with the air temperature of 100-110 DEG C and the air speed of 22.0-23.0m / s, the amount of the auxiliary air which is introduced into the primary air pipe accounts for 19-21 percent of the amount of the primary air, the air temperature of the pulverized coal in the primary air which enters the burner is 140-160 DEG C, and the air speed is 32.0-33.0m / s. The device is as follows: the hot air pipe is communicated with the primary air pipe by an induced draft fan and an auxiliary air pipe, the primary air pipe is communicated with the burner, and an included angle alpha between the direction of the auxiliary air which is introduced into the primary air pipe from the auxiliary air pipe in the method and the device and the flow direction of pulverized coal in the primary air pipe is 25-35 degrees. The method and the device reduce the heat needed by ignition and realize the purposes of easy ignition and stable combustion.

Description

technical field [0001] The invention relates to a method and a device for improving primary air auxiliary hot air of a W-shaped flame boiler. Background technique [0002] With the development of the national economy, the national energy policy requires thermal power plants to burn less fuel, more coal, and more low-quality coal, so that anthracite has become one of the main power coals. Because anthracite has high carbon content and low volatile matter, it is difficult to burn, so a new W-shaped flame combustion technology (device and method) that can adapt to anthracite or low-quality coal has emerged at the historic moment. [0003] W-shaped flame combustion technology is designed for burning low-quality coal, especially low-volatile coal. It can promote the combustion of coal powder by increasing the flame stroke. This technology has been adopted by boilers in some domestic power plants. use. However, in the process of use, there have been problems with relatively poor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23L15/00
CPCY02E20/34
Inventor 李争起任枫王静杰陈智超王琳
Owner HARBIN INST OF TECH