Storage-type super-low nitric oxide system in coal fired boiler coal mill

A technology for nitrogen oxide and coal-fired boilers, which is applied in the direction of combustion methods, combustion equipment, fuel supply, etc., can solve the problems of large investment in SCR out-of-stock devices, reduction of nitrogen oxide emissions, living environment pollution, etc., so that it is not easy to explode, The effect of reducing nitrogen oxide emissions and reducing coal fineness

CN103216840AActive Publication Date: 2013-07-24南京佛莱斯特环保科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2013-07-24

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Abstract

The invention relates to a storage-type super-low nitric oxide system in a coal fired boiler coal mill. On the basis of the existing low-nitrogen burning technology, the superfine coal powder preparation technology and the smoke circulating technology are adopted. The smoke circulating technology adopts cold furnace smoke to be mixed with primary air to be supercharged by a primary fan, the heating and powder feeding technology of an air preheater and the hot air and high-temperature furnace smoke drying technology of the powder production system are adopted, i.e. superfine coal powder can be prepared, the hot furnace smoke enters a primary air large air bellow, the hot furnace smoke is mixed with superfine coal powder prepared by a superfine coal powder preparation device in a coal powder blender and supplied by a powder supply machine from a coal powder cabin to be heated, and the air-powder mixture is fed into a low-nitrogen burner through a primary air pipe. In the main burning area of the boiler, since the air content of the furnace smoke is little, a lower residual air coefficient can be realized, the emission of the nitric oxide can be reduced.
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Description

technical field

[0001] The invention relates to a coal-fired boiler system, in particular to a storage type super nitrogen oxide reduction system in a coal pulverizer of a coal-fired boiler. Background technique

[0002] With the continuous development of the economy and the continuous improvement of living standards, the pollution of the environment in which human beings live is also increasing. Therefore, it is necessary to continuously improve technology to meet the requirements of human beings for the living environment. The combustion of power plant boilers produces a large amount of nitrogen oxides, which seriously pollutes the living environment.

[0003] At present, the out-of-stock technology adopted by coal-fired boilers in thermal power plants can be divided into combustion technology for reducing nitrogen oxides in the furnace and tail. The low-nitrogen combustion technology in the furnace adopts multi-stage air classification and thick and thin burners. 40-50%;...

Examples

Embodiment Construction

[0027] The medium-storage super low-nitrogen combustion system of the coal pulverizer of the coal-fired boiler includes high-temperature flue gas recirculation technology, ultra-fine coal powder preparation technology and low-nitrogen combustion technology. The high-temperature flue gas recirculation technology adopts the powder feeding technology of cold furnace smoke heated by the air preheater and the hot air plus high temperature furnace smoke drying technology of the pulverizing system: the so-called powder feeding technology of cold furnace smoke heated by the air preheater, that is, from the induced draft fan 30 The cold furnace smoke is extracted from the outlet flue, and led to the inlet of the primary fan 26 through the cold furnace smoke pipe 28. After mixing with the cold air at the inlet of the primary fan 26, it is heated by the air preheater 23, so that the temperature of the cold furnace smoke rises, and the temperature of the hot furnace smoke rises. Enter the ...