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Method for adjusting wall temperature of opposed firing boiler after low-load milling stop

An adjustment method and hedging combustion technology, which is applied in the direction of combustion method, combustion chamber, and controlled combustion, can solve problems such as wall temperature rise, and achieve the effects of not avoiding overheating, fast adjustment speed, and preventing overheating problems

Active Publication Date: 2021-07-13
SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a method for adjusting the wall temperature of the counter-fired boiler after the low-load shutdown, which can solve the problem of rapid and large rise in the wall temperature of the counter-fired boiler after the low-load shutdown, and prevent the boiler tube wall from overheating

Method used

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  • Method for adjusting wall temperature of opposed firing boiler after low-load milling stop
  • Method for adjusting wall temperature of opposed firing boiler after low-load milling stop
  • Method for adjusting wall temperature of opposed firing boiler after low-load milling stop

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Embodiment

[0031] Unit 3 of a certain power plant is a 1050MW coal-fired turbogenerator set. The combustion equipment is a swirl pulverized coal burner that adopts the opposite combustion method of the front and rear walls. There are a total of 6 layers of swirl pulverized coal burners, and the front and rear walls are respectively arranged with 3 layers. There are 8 swirling pulverized coal burners on the front and rear walls of each floor, and each pulverizing system provides air powder mixture for the 8 pulverized coal burners on the corresponding floor. One layer of exhaust air is arranged above the swirl pulverized coal burners on the front and rear walls; the combustion equipment on the front (rear) wall is arranged as follows figure 2 shown.

[0032] When the 600MW load is operated with the lower four-layer mill (ABDE), the wall temperature distribution is good, and the outlet wall temperature of the upper water-cooled wall on the front wall is stable at about 430°C, but after th...

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Abstract

The invention discloses a method for adjusting the wall temperature of an opposed firing boiler after low-load milling stop. The adjusting method is used for adjusting the wall temperature of the opposed firing boiler under the low load when the number of coal mills is changed from four to three. The adjusting method comprises the steps that the opening degree of cold primary air of the shutdown mill, the opening degree of over fire air and the coal feeding amount of the coal mill on the opposite side of the shutdown coal mill are adjusted; and the adjusting process specifically comprises the steps of increasing the opening degree of the cold primary air of the shutdown mill and adjusting the opening degree of the over fire air differentially. The coal feeding amount of the coal mill on the opposite side of the shutdown coal mill is gradually reduced.

Description

technical field [0001] The invention relates to the technical field of boiler commissioning, in particular to a method for adjusting the wall temperature of a counter-combustion boiler after grinding is stopped under low load. Background technique [0002] With the advancement of the domestic deep peak shaving policy, the running time of thermal power units under low load continues to increase. Domestic counter-firing boilers occupy the vast majority of 600MW and 1000MW units. Under low load, the number of coal mills is changed from 4 to 3 mills, and the operation mode of coal mills is changed from symmetric to asymmetric. In the end, the deviation of combustion heat load may be increased, causing the wall temperature to rise rapidly, and even overheating problems. [0003] At present, there are many researches on the adjustment of wall temperature deviation of opposed combustion boilers at home and abroad, most of which focus on the influence of burners, exhaust air rods, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23N5/00F23N1/02F23K1/00F23M5/08
CPCF23N5/00F23N1/02F23K1/00F23M5/08
Inventor 赵鹏王小华陈宝康陈敏梅振锋薛晓垒彭小敏俞胜捷刘瑞鹏丁奕文朱晋永姚胜王祝成梁昊王晖
Owner SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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