Medium-speed coal mill outlet air temperature adjusting method

A coal mill and temperature adjustment technology, applied in grain processing, etc., can solve problems such as inconvenient operation, slow air temperature adjustment speed, and excessive air temperature adjustment, and achieve the effect of improving rapid response ability

Active Publication Date: 2019-07-05
中科锐能(北京)科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the coal quality and the load of the coal mill change, the outlet temperature of the coal mill cannot quickly track and respond, either

Method used

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  • Medium-speed coal mill outlet air temperature adjusting method
  • Medium-speed coal mill outlet air temperature adjusting method
  • Medium-speed coal mill outlet air temperature adjusting method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0049] Example one

[0050] The outlet temperature of the coal mill is set according to the coal type. When the coal is dried and the ash-free volatile matter V is daf When ≤40%, the outlet temperature of coal mill t M2 Controlled at 75℃, when the coal is dried, there is no volatile matter V daf >40%, the outlet temperature of the coal mill t M2 It is controlled at 60-70℃, the inlet temperature of the coal mill is set, and it is calculated by heat balance.

[0051] In the heat balance calculation, first determine the total heat input q of the pulverizing system in

[0052] q in =q ag1 +q le +q s +q mac

[0053] q ag1 Physical heat of desiccant, kJ / kg; q le Physical heat leaking into the cold air, take 0, kJ / kg; q s Physical heat of sealing wind, kJ / kg; q max The mechanical heat generated by the work of the coal mill, kJ / kg.

[0054] q ag1 =C ag1 t 1 g 1

[0055] The amount of drying entering the coal mill, kg / kg; Q v The primary air volume at the inlet of the coal mill, t / h; B M...

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Abstract

The invention discloses a medium-speed coal mill outlet air temperature adjusting method. The medium-speed coal mill outlet air temperature adjusting method mainly involves a data acquisition module,a calculation module, a big data analysis module and an output module, wherein the data acquisition module is used for acquiring a furnace coal quality parameter and a boiler real-time operation parameter, the calculation module determines the inlet air temperature of the coal mill through heat balance, the big data analysis module is used for determining the inlet cold and hot air door opening degree of the coal mill corresponding to the inlet air temperature of the coal mill, and the output module is used for outputting the real-time coal mill cold and hot air door opening instructions. Compared with the prior art, the medium-speed coal mill outlet air temperature adjusting method has the advantages that the rapid response capability of the outlet air temperature of the coal mill and thesafety and economic operation levels of the boiler are improved.

Description

technical field [0001] The invention relates to the field of coal-fired power generation, and relates to a method for quickly adjusting the outlet air temperature of a medium-speed coal mill. By calculating the heat balance of the coal mill, the method calculates the air temperature at the inlet of the coal mill corresponding to the set outlet temperature of the coal mill, and combines the big data analysis to determine the opening of the cold and hot air doors corresponding to the air temperature at the inlet of the coal mill. Improve the quick response ability of the outlet air temperature of the coal mill. Background technique [0002] At present, large coal-fired generating units are often equipped with positive pressure direct blowing pulverization system. The outlet temperature of the coal mill is an important parameter for the control and adjustment of the positive pressure direct blown pulverizing system. If the opening of the cold air door of the coal mill is larg...

Claims

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Application Information

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IPC IPC(8): B02C25/00
CPCB02C25/00
Inventor 荣幸
Owner 中科锐能(北京)科技有限公司
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