Coal mill outlet temperature control method and system based on flue gas inerting

Abstract

The invention discloses a coal mill outlet temperature control method and system based on flue gas inerting. Starting from the mechanism of detonation of a coal pulverizing system, the oxygen contentof the coal pulverizing system is reduced through the tail smoke of a boiler, the coal pulverizing system is inerting, and the anti-explosion capacity is improved. The concentration of combustible gasCO separated out through pyrolysis in the coal mill outlet pulverized coal heating process and the coal mill outlet air speed are monitored, a strategy is provided for adjusting the oxygen content, the air temperature and the air volume of inert media of the coal pulverizing system, and the temperature level of a coal mill outlet in an actual running process is determined. Compared with a traditional coal pulverizing system and method that the coal mill outlet temperature is determined according to an empirical formula, and a large amount of cold air needs to be doped, the remarkable coal type adaptation advantage and the safety guarantee advantage are achieved, the comprehensive output of the coal pulverizing system can be effectively improved, the coal pulverizing power consumption is reduced, and the boiler efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of coal-fired power generation, and in particular relates to a method and system for controlling the outlet temperature of a coal mill based on furnace smoke inerting. Background technique [0002] The temperature control of the coal mill outlet of the pulverizing system has always been the key factor for the explosion protection of the pulverizing system. If the temperature of the pulverizing machine outlet is too high, the safety of the pulverizing system will be reduced, and it will easily lead to unsafe incidents and threats of deflagration in the pulverizing system. The operation of the unit is safe; if the outlet temperature of the coal mill is controlled too low, it will easily lead to the dryness of the pulverizing system and insufficient ventilation output. The power consumption of the pulverizing system will increase and the output will drop. As the temperature rises, the efficiency of the boiler i...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of insufficient output and reduced economy of the pulverizing system caused by the conventional coal mill outlet temperature method caused by the mixing of a large amount of cold air in the pulverizing system, and to provide a coal pulverizer outlet temperature based on furnace smoke inertization. Control method and system

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