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A swirl pulverized coal combustion device and method using flue gas recirculation

A flue gas recirculation and pulverized coal combustion technology, applied in the combustion method, burner, combustion type, etc., can solve the problems of serious slagging, poor burnout, and high NOx emissions, reduce NOx generation, avoid furnace The effect of internal slagging

Active Publication Date: 2019-12-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of high NOx emission, serious slagging and poor burnout of existing industrial pulverized coal boilers, the present invention further proposes a swirling pulverized coal combustion device and method using flue gas recirculation

Method used

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  • A swirl pulverized coal combustion device and method using flue gas recirculation

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specific Embodiment approach 1

[0026] Specific implementation mode one: combine figure 1 Describe this embodiment. A swirl pulverized coal combustion device using flue gas recirculation described in this embodiment includes a primary air duct 1, a direct current secondary air duct 2, a swirl inner secondary air duct 3, and a swirl outer second air duct. Secondary air duct 4, recirculation flue gas duct 13 and furnace 16, primary air duct 1, direct current secondary air duct 2, swirling inner secondary air duct 3 and swirling outer secondary air duct 4 are arranged in sequence from inside to outside , the inlet end of the primary air pipe 1 is connected to the outlet end of the pulverized coal pipe 18, and the outlet end of the recirculation flue gas pipe 13 is respectively connected to the DC secondary air pipe 2, the secondary air pipe 3 inside the swirl flow, and the secondary air pipe outside the swirl flow. The inlet end of the air duct 4 is connected, and the outlet ends of the primary air duct 1, the ...

specific Embodiment approach 2

[0027] Specific implementation mode two: combination figure 1 This embodiment is described. The primary air duct 1 , the DC secondary air duct 2 , the secondary air duct 3 inside the swirl flow, and the secondary air duct 4 outside the swirl flow described in this embodiment are arranged coaxially. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

specific Embodiment approach 3

[0028] Specific implementation mode three: combination figure 1 Describe this embodiment, between the outlet end of the recirculation flue gas pipe 13 described in this embodiment and the inlet ends of the DC secondary air pipe 2, the secondary air pipe 3 inside the swirl flow, and the secondary air pipe 4 outside the swirl flow respectively It is connected by a branch pipe for recirculating flue gas 17, and a valve 12 for the pipe for recirculating flue gas is provided on the branch pipe for recirculating flue gas. The undisclosed technical features in this embodiment are the same as those in the first or second specific embodiment.

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Abstract

The invention provides a swirl pulverized coal burning device and method adopting flue gas recirculation and relates to the technical field of industrial pulverized coal boilers. The swirl pulverizedcoal burning device and method aim at solving the problems that an existing industrial pulverized coal boiler is high in NOx emission, serious in slagging and bad in burn-out effect. The burning device comprises a primary air pipe, a direct-current secondary air pipe, a swirl inside secondary air pipe, a swirl outside secondary air pipe, a recirculation flue gas pipeline and a hearth. The primaryair pipe, the direct-current secondary air pipe, the swirl inside secondary air pipe and the swirl outside secondary air pipe are sequentially arranged from inside to outside. The inlet end of the primary air pipe is connected with the outlet end of a pulverized coal pipeline. The outlet end of the recirculation flue gas pipeline is connected with the inlet ends of the direct-current secondary airpipe, the swirl inside secondary air pipe and the swirl outside secondary air pipe. An inner axial swirl blade is arranged in the swirl inside secondary air pipe. An outer axial swirl blade is arranged in the swirl outside secondary air pipe. The burning method comprises the steps of flue gas mixing, flowing speed control, flue gas proportion adjusting and ignition. The swirl pulverized coal burning device and method are used for industrial pulverized powder boilers.

Description

technical field [0001] The invention relates to the technical field of industrial pulverized coal boilers, in particular to a swirl pulverized coal combustion device and method using flue gas recirculation. Background technique [0002] In my country, coal-fired industrial boilers are the main coal-consuming equipment except power plant boilers, with a total of nearly 600,000 units and an annual coal consumption of nearly 640 million tons. The main problems of coal-fired industrial boilers in my country: (1) The actual average thermal efficiency is mostly around 65%, while the thermal efficiency of developed countries generally reaches more than 90%; (2) Pollutant discharge exceeds the standard, generally failing to meet national and local emission standards , Coal-fired industrial boilers produce about 2 million tons of NOx every year, second only to coal-fired power plant boilers. [0003] In recent years, with the continuous maturity of pulverized coal combustion technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23D1/02
Inventor 陈智超严蓉刘涛曾令艳李争起
Owner HARBIN INST OF TECH