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Method for preventing coal pulverizing system from exploding

A technology of pulverizing system and air pulverization, which is applied in the field of preventing coal mill explosion, and can solve problems such as explosion of pulverizing system and hidden dangers of pulverizing system safety

Inactive Publication Date: 2010-02-03
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coal mill outlet temperature of 76-77°C brings certain hidden dangers to the safety of the pulverizing system. The pulverizing system is prone to explosion problems, and such phenomena have occurred in existing power plants (Sanhe, Panshan)

Method used

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  • Method for preventing coal pulverizing system from exploding
  • Method for preventing coal pulverizing system from exploding

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Embodiment 1

[0023] In this embodiment, each working parameter is:

[0024] Grinding coal powder: Shenhua coal;

[0025] Pulverizing system: medium-speed HP mill, direct blown coal mill;

[0026] Coal mill outlet temperature: 65°C;

[0027] Primary air powder mixture temperature: 65°C; secondary air temperature: 300°C.

[0028] The method is simple in the actual operation of the power plant, and the operator of the power plant can control it through the switch of the damper. It is an important parameter related to security that is controlled at all times. According to the previously specified value, it is relatively high for Shenhua coal, and explosion accidents often occur. The power plant adopts this recommended value, and other operating conditions remain normal. The ignition and burnout of the boiler is not affected, and there is no deflagration in the pulverizing system due to high wind temperature. .

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Abstract

The invention provides a method for preventing a coal pulverizing system from exploding. By controlling an outlet temperature of the coal pulverizing system to between 60 and 70 DEG, preferably 65 DEGC, the method retards the coal dust inflammation, effectively avoids peak temperature, improves the safety of the coal pulverizing system, obtains beneficial technical effects, and is more suitable for Shenhua coal. While controlling the outlet air temperature of a coal mill, the method controls the temperature of primary air powder mixture to between 60 and 65 DEG C, and the temperature of secondary air to between 290 and 320 DEG C preferably.

Description

technical field [0001] The invention relates to a method for preventing explosion of a pulverizing system, more particularly, the invention relates to a method for preventing explosion of a coal pulverizer. Background technique [0002] The pulverizing system is an important auxiliary equipment in thermal power plants. Its function is to dry, crush and make coal powder of a certain size for the boiler to burn. Controlling the outlet temperature of the pulverizing system can ensure its drying output. Under the conditions permitted by the system, the higher the outlet temperature, the greater the drying output, and the output of the entire pulverizing system can be improved. However, if the outlet temperature is too high, it will cause the coal mill to catch fire and cause an explosion. For boilers designed by Guohua Power Plant based on Shenhua coal, the outlet temperature of the coal mill is generally designed to be 76-77°C. [0003] According to the explosion-proof design...

Claims

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Application Information

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IPC IPC(8): F23K1/00
Inventor 赵毅顾大钊姚伟王品刚蒙毅李占元杨忠灿李建定
Owner CHINA SHENHUA ENERGY CO LTD
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