Positive pressure direct-blown pulverization system and its control method based on temperature segmental control
A technology of segmented control and pulverizing system, which can be used in the control of combustion, combustion method, block/powder fuel preparation, etc. It can solve the problems of mixing pulverizing system, sacrificing boiler operation economy, etc., to ensure drying output. , The effect of preventing the nozzle from burning and adjusting the ignition distance
Active Publication Date: 2016-01-20
XIAN TPRI BOILER ENVIRONMENTAL PROTECTION ENG CO LTD +1
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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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Embodiment Construction
[0023] The present invention will be further described in detail below in conjunction with the drawings.
[0024] See figure 1 , The present invention is a positive pressure direct blowing pulverizing system based on temperature segmentation control, including air preheater 2, blower 3, primary fan 4, sealed fan 5, coal mill 6, coarse powder separator 7, air volume measuring device 8. The original coal hopper 9, the coal feeder 10, the pulverized coal distributor 11, the isolation door 12, the pulverized coal system regulating air box 13, the pulverized coal burner 14 and the secondary air box 15.
[0025] Among them, the raw coal hopper 9 is used to supply coal to 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 coal powder outlet of the coal mill 6 is connected to the inlet of the coarse powder separator 7, and the coarse powder is separated The outlet of the device 7 is connected to the inlet of the pulverized c...
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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 specifically relates to a positive pressure direct-blowing pulverizing system based on temperature section control and a control method thereof. 【Background technique】 [0002] In the traditional positive pressure direct-blowing pulverizing system power station boiler, the hot air entering the pulverizing system dries the pulverized coal in the coal mill, and then sends the pulverized coal into the furnace for combustion through the pulverized delivery pipeline. The ventilation volume of the pulverizing system is the same as the powder feeding air volume, and the outlet temperature of the pulverizing system is the same as the powder feeding system temperature. When the boiler's actual volatile matter, moisture and boiler load change significantly, the ventilation volume of the pulverizing system and the outlet air temperature of the pulverizing system are required to change a...
Claims
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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