A method for diagnosis and prevention of soot blocking in flue gas channel at the tail of double tangentially fired boiler

Abstract

A method for diagnosing and preventing soot blockage in the flue gas channel at the tail of a double tangentially fired boiler. In a cold state, simulate the working condition of the hot state, and measure the section of the heating surface at the key position of the flue gas channel at the tail of the double tangentially fired boiler. Wind speed, compare whether the area with low wind speed is basically consistent with the ash accumulation area; if they are consistent, adjust the opening of the reheated flue gas baffle several times in the cold state and monitor the key positions described under each opening The cross-sectional wind speed of the heating surface, the opening of the reheated flue gas baffle at which the cross-sectional wind speed of the heating surface at the key position is the most uniform is the pre-adjusted opening; in the hot state, adjust the double tangential combustion Boiler parameters, when ensuring the normal operation of the double tangential combustion boiler, make the opening of the reheated flue gas baffle close to the preset opening. The method of the invention only needs to adjust the opening of the flue gas baffle to prevent and prevent ash blockage in the flue gas passage at the tail, and is easy to implement, low in cost and easy to control.

Description

technical field [0001] The invention belongs to the field of boiler debugging, and in particular relates to a method for diagnosing and preventing ash blockage in flue gas channels at the tail of a double tangential combustion boiler. Background technique [0002] After the transformation of the low-nitrogen burner for large-scale units, the radiation heat transfer in the furnace and the convective heat transfer at the tail will change significantly, mainly manifested in the upward movement of the flame center, resulting in enhanced convective heat transfer, panel overheating, and final The superheater and final reheater tube wall is easy to overheat, the accidental water injection volume increases, and the exhaust gas temperature rises. A lot of research has been carried out to solve the above problems. [0003] At the same time, there are many studies on the wear of pipes on the heating surface of the tail flue gas channel for large-scale units. Targeted measures have bee...

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Problems solved by technology

[0004] However, there is no report on the research and prevention of soot accumulation in the tail passage after the transformation of the low-nitrogen burner

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