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System and method for utilizing flue gas circulation to prevent deflagration of hearth bottom

A flue gas circulation and furnace technology, applied in the combustion method, the safety device of the combustion chamber, the combustion chamber, etc., can solve the problems of easily causing deflagration, accidents, etc., to reduce the intensity of deflagration, reduce the possibility and destructiveness, and achieve online The effect of automatic control

Active Publication Date: 2015-07-01
XI AN JIAOTONG UNIV
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Problems solved by technology

In the case of falling coke or falling sparks, it is easy to cause deflagration and cause serious accidents

Method used

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  • System and method for utilizing flue gas circulation to prevent deflagration of hearth bottom

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0024] see figure 1 , the present invention includes several CO concentration on-line monitoring measuring points 2 uniformly arranged along the inner wall circumference of the lower part of the cold ash hopper at the bottom of the furnace, the signal output end of the CO concentration on-line monitoring measuring point 2 is connected with the CO concentration on-line monitoring system arranged outside the furnace 5 is connected to the signal input end, and the output end of the CO concentration online monitoring system 5 is connected to the explosion suppression air regulating valve 6 through the controller, and the inlet of the explosion suppression air regulating valve 6 is connected to the economizer 8 through the axial flow generator 7, The outlet is connected to the explosion-suppressin...

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Abstract

The invention discloses a system and method for utilizing flue gas circulation to prevent deflagration of a hearth bottom. A CO concentration online monitoring point is arranged at the bottom of a cold ash hopper area to monitor CO concentration signals of the area on line, opening of explosion suppression air regulating valves is controlled after analysis is performed through a CO concentration online monitoring system connected with the CO concentration online monitoring point, flue gas passing through a coal economizer is sent to the boiler cold ash hopper area through the explosion suppression air regulating valves in a vertically staggered hedging mode, good explosion suppression characteristics of high-concentration CO2, N2 and vapor in the flue gas are utilized to reduce a deflagration concentration interval of the reducing combustible gas CO in the area and deflagration strength which may occur, and the goal of preventing, weakening and eliminating deflagration is achieved. The system is of great significance for safe operation of a large power station boiler under the conditions of coal quality fluctuation.

Description

technical field [0001] The invention belongs to the safety field of large-scale power plant boilers, and in particular relates to a system and method for preventing deflagration at the bottom of a furnace by utilizing flue gas circulation. Background technique [0002] Under the background of increasingly tight energy supply at home and abroad, my country's coal-fired power plants have to bear expensive fuel costs. In order to reduce fuel costs as much as possible, and also affected by the coal supply environment in the market, many power plants have to purchase a large amount of low-quality small kiln coal. However, limited by the production environment and technical level of coal in small kilns, the quality of coal supplied often fluctuates greatly, making it normal for power plants to deviate from the coal quality designed for boilers for a long time. Therefore, while the fuel cost of the power plant is reduced, the operation and maintenance cost is virtually increased. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23M11/00
Inventor 谭厚章刘原一朱轶铭王学斌牛艳青熊英莹
Owner XI AN JIAOTONG UNIV
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