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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  • Summary
  • 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 the air temperature adjustment speed is too slow, or the air temperature adjustment is too high, which brings inconvenience to the operation

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

Embodiment 1

[0050] The outlet temperature setting of the coal mill is determined according to the type of coal. When the coal is dry and ash-free, the volatile V daf ≤40%, coal mill outlet temperature t M2 Controlled at 75°C, when coal-fired dry ash-free base volatile V daf When >40%, the coal mill outlet temperature t M2 It is controlled at 60-70°C, and the inlet temperature of the coal mill is set, which is calculated by heat balance.

[0051] In heat balance calculation, first determine the total input heat q of the milling 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 leaked into the cold air, take 0, kJ / kg; q s Physical heat of sealing air, kJ / kg; q max The mechanical heat generated by the coal mill, kJ / kg.

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

[0055] Drying dose entering the coal mill, kg / kg; Q v Primary air volume at the coal mill inlet, t / h; B M Output for coal mill, t / h; c ag1 for t 1 Speci...

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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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