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

A technology of outlet temperature and control system, applied in the direction of combustion method, dryer, valve configuration, etc., can solve the problems of insufficient output of the pulverizing system and reduced economic efficiency, achieve significant advantages of coal type adaptation, improve comprehensive output, The effect of improving boiler efficiency

Pending Publication Date: 2020-08-11
XIAN THERMAL POWER RES INST CO LTD
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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 m

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

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] see figure 1 , the coal mill outlet temperature control method and system based on furnace fume inertization in the present invention include a boiler 1, a tail flue heat exchanger 2, an air preheater 3, a primary fan 4, an induced draft fan 5, a low-temperature furnace smoke damper 6, Low temperature furnace smoke temperature measuring point 7, high temperature furnace smoke damper 8, high temperature furnace smoke temperature measuring point 9, furnace smoke fan inlet damper 10, mixed furnace smoke temperature measuring point 11, furnace smoke fan 12, furnace smoke fan outlet damper 13, heat Primary damper 14, hot primary air temperature measuring point 15, coal mill inlet damper 16, mill inlet oxygen measuring point 17, mill inlet temperature measuring point 18, coal mill 19, pulverized coal separator 20, coal bunker 21, supply Coal machine 22, pow...

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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...

Claims

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Application Information

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IPC IPC(8): F23K1/00F23J15/06F23L11/00F26B21/10B02C25/00
CPCB02C25/00F23J15/06F23K1/00F23L11/00F26B21/10
Inventor 汪华剑白鹏王洋严响林邓玲恵周虹光张朋飞吴庆龙房凡陈煜
Owner XIAN THERMAL POWER RES INST CO LTD
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