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Method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas

A combustion method and pyrolysis gas technology, applied in the direction of combustion equipment, lighting and heating equipment, etc., can solve problems such as input-output ratio concerns, achieve the effects of reducing emissions, simple and reliable system, and realizing denitrification efficiency

Inactive Publication Date: 2012-07-04
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural gas, coke oven gas, biomass gas, underground coalbed methane, etc. can all be used as gas reburning fuels, but for specific pulverized coal furnaces, they are often limited by the source of gas reburning fuels, and there are concerns about the input-output ratio

Method used

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  • Method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas
  • Method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas

Examples

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Effect test

Embodiment 1

[0033] A low-NO x Apparatus for combustion method, see appendix figure 1 .

[0034] A low-NO x Combustion method device, including reheater 13, high temperature convection superheater 14, low temperature convection superheater 15, economizer 17, air preheater 18, dust collector 19, induced draft fan 20, primary air pipe 21, tail flue 16. Pulverized coal rapid pyrolysis device, flue gas circulation system and pulverized coal furnace low NO x Combustion system and its connected pipelines;

[0035] The pulverized coal rapid pyrolysis device is composed of a pulverized coal bin 1, a coal hopper 2, a pyrolysis reactor 3, and a slag removal tank 4;

[0036] The flue gas circulation system is composed of a cyclone separator 5, a fan 6 and a flue gas circulation pipe 7;

[0037] Pulverized coal boiler low NO x The combustion system is composed of pulverized coal nozzle 10, pyrolysis gas nozzle 11, air nozzle 12 and pulverized coal boiler furnace 25;

[0038] Pulverized coal boi...

Embodiment 2

[0042] A low-NO x burning method

[0043] About 25% of the pulverized coal boiler flue gas is drawn by the fan 6, circulates back from the tail flue 16, passes through the flue gas circulation pipe 7, and flows in parallel with the pulverized coal sent from the coal bunker 1 through the sealed gravity feeding coal hopper 2 into the fast The pyrolysis reaction is carried out in the pyrolysis reactor 3 . The flue gas temperature at 16 at the tail flue is about 600°C; the pulverized coal entering the fast pyrolysis reactor accounts for about 30% of the total powder feed to the pulverized coal boiler, and the pyrolysis reaction temperature is controlled at about 500°C, and the reaction time is about 5S .

[0044] Heated by circulating hot flue gas, the pyrolysis gas produced by the rapid pyrolysis of coal powder comes out from the side of the lower part of the pyrolysis reactor 3, and passes through the cyclone separator 5, the induced draft fan 6, and the pulverized coal pyroly...

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Abstract

The invention discloses a method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas. The method comprises the following steps: quickly pyrolizing the pulverized coal by utilizing partial hot smoke gas of a tail flue of a pulverized coal boiler entering a pyrolysis reactor; delivering the pulverized coal pyrolysis gas serving as the gas reburning fuel into a reburning area of the pulverized coal boiler to perform high-efficiency NOx reduction, and completely burning the gas reburning fuel subjected to NOx reduction in a burning-out area of the pulverized coal boiler to discharge the low NOx of the pulverized coal boiler; and allowing semicoke which is produced through the pulverized coal pyrolysis to enter a main burning area of the pulverized coal boiler which is carried by primary air to finish burning. The device of the technique mainly comprises a pulverized coal quick pyrolysis device, a pulverized coal flue gas circulating system, a boiler low NOx burning system and a pipeline which is connected with the boiler low NOx burning system. The method and the device have the advantages of simple structure, low investment, high denitration efficiency, and wide application prospect.

Description

technical field [0001] The invention relates to reducing NO in pulverized coal boilers x The recombustion method and device of the exhaust, specifically involving the use of circulating hot flue gas to provide the heat required for pulverized coal pyrolysis, and the recombustion of pulverized coal pyrolysis gas to achieve low NO in pulverized coal boilers x The emission combustion method and device thereof belong to a new method and a new device in the field of clean utilization of energy. Background technique [0002] my country's electric power, iron and steel, metallurgy and other industries are mainly coal-fired. In recent years, with the expansion of production and the continuous increase of coal consumption, the emission of nitrogen oxides has also shown a trend of rapid growth. With the improvement of environmental protection requirements, it is inevitable to control the emission of nitrogen oxides. Reburn technology as a low NO x A kind of combustion technology, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C9/06
Inventor 金晶沙永涛江鸿刘瑞宋博路遥蔡灿稳何丹丹张忠孝
Owner UNIV OF SHANGHAI FOR SCI & TECH
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