A Coal Blending Combustion Method for Reducing Boiler Slagging
A technology of coal blending and slagging, which is applied in the field of coal blending and blending to reduce boiler slagging, and can solve the problems of high ash powder, low calorific value, and coking of the water wall and side wall of the pulverizing system, so as to avoid blockage , the effect of not easy to block
Active Publication Date: 2020-06-26
华能甘肃能源开发有限公司 +1
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Problems solved by technology
[0002] In order to reduce fuel costs and control incoming coal prices, thermal power plants began to use a large number of economical and inferior coals. Due to the high ash and low calorific value of economical coals, frequent blockages in the pulverizing system and large areas of coking on the side walls of water walls, The slag well of the dry slag machine is coke phenomenon, and the matrix of the coke block is hard and difficult to remove, which seriously affects the safe operation of the boiler
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[0017] A coal blending and burning method for reducing boiler slagging includes the following steps:
[0018] a. Set up the combustion system: install 12 4Z burners on the upper, middle and lower layers of the front wall, and 8 XCL burners on the lower layers of the front and rear walls, each on each floor of the front and rear walls. 4 burners, from the burner sequence that coal passes through, set each column of burners to 1, 2, 3, and 4 groups in turn;
[0019] b. Adjust the coal blending method: blend high-quality coal to the lower coal pulverizer, and economically inferior coal to the middle and upper coal pulverizers;
[0020] c. Adjust the pulverizing system: reduce the automatic adjustment range of primary air duct pressure, control the air-to-coal ratio at 1.8-2, and the primary air speed between 24-28m / s, gradually close the inlet cold air adjustment door, and open the large inlet hot air adjustment door. Control the coal fineness between 20-22%;
[0021] d. Set up soot blo...
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The invention relates to a coal blending and combustion method for reducing boiler slag-bonding. The coal blending and combustion method comprises the following steps of a, setting up a combustion system: mounting twelve 4Z type burners on the upper layer and the middle layer of a front wall and the lower layer of a rear wall, and mounting eight XCL type burners on the lower layers of the front wall and the rear wall, wherein each layer of the front wall and the rear wall has four burners; b, adjusting a coal blending mode: distributing high-quality coal to a lower-layer coal mill, and distributing cheap inferior coal to a middle-layer coal mill and an upper-layer coal mill; c, adjusting a coal pulverizing system: reducing the automatic adjusting range of primary air main-pipe pressure, gradually closing an inlet cold air adjusting door and opening an inlet hot air adjusting door, and controlling the fineness of pulverized coal to 20-22%; d, setting up a soot blowing system: mounting three layers of soot blowers at the upper part of each burner, wherein each layer has twenty soot blowers; respectively mounting nineteen soot blowers on the left side and the right side of a horizontal flue; and respectively mounting twelve soot blowers on the left side and the right side of a tail shaft flue. Thus, the coal blending and combustion method avoids the problems that traditional inferior coal blending and combustion is set in the lower layer, o that blockage is caused by more soot production, and then the phenomenon of coking and slag blocking occurs.
Description
Technical field [0001] The invention belongs to the technical field of boiler equipment, and specifically relates to a coal blending method for reducing boiler slagging. Background technique [0002] In order to reduce fuel costs and control the price of coal entering the plant, thermal power plants began to use a large number of economical inferior coals. Due to the high ash powder and low calorific value of economical coals, the pulverizing system frequently encountered grinding blockage and large-area coking on the side wall of the water wall The coke phenomenon of the slag shaft of the dry slag machine, and the hard matrix of the coke block is difficult to remove, which seriously affects the safe operation of the boiler. Summary of the invention [0003] The purpose of the present invention is to provide a coal blending method that can reduce boiler slagging while ensuring the economic benefits of the power plant. [0004] In order to achieve the above objectives, the present i...
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IPC IPC(8): F23K1/00
CPCF23K1/00
Inventor 陈宪刚武世华李赛
Owner 华能甘肃能源开发有限公司