Method for preventing and treating ash blocking of tail flue gas channel of double-tangent-circle combustion boiler

Abstract

The invention relates to a method for preventing and treating ash blocking of a tail flue gas channel of a double-tangent-circle combustion boiler. The method comprises the following steps that in a cold state, a working condition of hot-state operation is simulated, section air speed of a heating surface at a key position of the tail flue gas channel of the double-tangent-circle combustion boiler is measured, and whether an area with low wind speed is basically consistent with an ash deposition area or not are compared; if yes, in the cold state, opening degree of a reheating flue gas baffle is adjusted multiple times, the section air speed of the heating surface at the key position under each opening degree is monitored, and the opening degree of the reheating flue gas baffle with the most uniform section air speed of the heating surface at the key position is obtained as pre-adjusted opening degree; in a hot state, parameters of the double-tangent-circle combustion boiler are adjusted, and when it is guaranteed that the double-tangent-circle combustion boiler operates normally, the opening degree of the reheating flue gas baffle is close to the pre-adjusted opening degree. By means of the method, ash blocking of the tail flue gas channel can be well prevented and treated only by adjusting the opening degree of the flue gas baffle, implementation is simple and easy, cost is low, and control is easy.

Description

[0001] This case is a divisional application with an application date of 2019 / 7 / 15 and an application number of 2019106380454, and the patent name is a method for diagnosing and preventing dust blocking in flue gas channels at the tail of double tangential combustion boilers technical field [0002] The invention belongs to the field of boiler debugging, and in particular relates to a method for preventing and preventing ash blocking in flue gas channels at the tail of a double tangentially fired boiler. Background technique [0003] 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 th...

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Problems solved by technology

[0005] 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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