Positive-pressure direct-firing pulverizing system based on segmented temperature control and control method thereof

A segmented control and pulverizing system technology, applied in the direction of combustion control, combustion method, block/powder fuel preparation, etc., can solve the problems of mixing pulverizing system, sacrificing boiler operation economy, etc., to ensure drying output , prevent burnout of the nozzle, and ensure the effect of ventilation output

Active Publication Date: 2014-07-16
XIAN TPRI BOILER ENVIRONMENTAL PROTECTION ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To meet the air temperature and air volume requirements of the pulverizing and powder feeding systems at the same time, it is often necessary to mix the pulverizing system with cold air, sacrificing the economy of boiler operation

Method used

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  • Positive-pressure direct-firing pulverizing system based on segmented temperature control and control method thereof

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] see figure 1 , the present invention is based on the positive pressure direct-blown pulverization system controlled by temperature segments, including an air preheater 2, a blower 3, a primary fan 4, a sealing fan 5, a coal mill 6, a coarse powder separator 7, and an air volume measuring device 8. Raw coal hopper 9, coal feeder 10, pulverized coal distributor 11, isolation door 12, powder feeding system regulating air box 13, pulverized coal burner 14 and secondary air box 15.

[0025] Wherein, the raw coal hopper 9 is used to supply coal for the coal feeder 10, the outlet of the coal feeder 10 is connected to the raw coal inlet of the coal mill 6, and the pulverized coal outlet of the coal mill 6 is connected to the entrance of the coarse powder separator 7, and the coarse powder is separated The outlet of the device 7 is connected to the inlet of th...

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Abstract

The invention discloses a positive-pressure direct-firing pulverizing system based on segmented temperature control and a control method of the positive-pressure direct-firing pulverizing system. The positive-pressure direct-firing pulverizing system comprises an air preheater, an air feeder, a primary air fan, a seal air fan, a coal mill, a tailing separator, a raw coal hopper, a coal feeder, a pulverized coal distributor, an isolation door, a pulverized coal feeding system adjustment bellows, a pulverized coal burner and a secondary bellows. According to the control method, an inlet and an outlet of the coal mill are taken as a segment, an inlet and an outlet of a pulverized coal feeding system are taken as another segment, cold air and hot air are fed into the corresponding inlets of the two segments through corresponding pipelines, the temperatures of the two segments are monitored respectively, and then segmented control over the temperature of the pulverizing system is achieved. By means of the control method, the temperature of the pulverizing system and the temperature of the pulverized coal feeding system can be independently controlled, the air speed of the pulverized coal feeding system is kept not decreased under the condition that the air quantity of the pulverizing system is changed, and the demands for conveying pulverized coal and preventing a nozzle from being burnt out are met.

Description

【Technical field】 [0001] The invention belongs to the technical field of coal-fired power generation, and in particular relates to a positive pressure direct-blowing pulverizing system based on temperature segment control and a control method thereof. 【Background technique】 [0002] For traditional positive pressure direct blowing pulverizing system power plant boilers, the hot air entering the pulverizing system dries the pulverized coal in the pulverizer, and then sends the pulverized coal into the furnace through the pulverizing pipeline for combustion. The ventilation volume of the pulverizing system is the same as that of the powder feeding system, and the outlet temperature of the pulverizing system is the same as that of the powder feeding system. When the volatile matter, moisture, and boiler load of the actual coal entering the boiler change greatly, the ventilation volume of the pulverizing system and the outlet air temperature of the pulverizing system are require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23K1/04F23N3/00F23L15/00
CPCY02E20/34
Inventor 周虹光汪华剑严响林白鹏房凡张伟张朋飞
Owner XIAN TPRI BOILER ENVIRONMENTAL PROTECTION ENG CO LTD
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