A monitoring method for segmental dust deposition in a three-segment rotary preheater

Abstract

The invention discloses a segmented ash accumulation monitoring method for a three-segment rotary preheater, which mainly includes a data acquisition module, a calculation module and an output module. The data acquisition module collects coal quality parameters, structural parameters and real-time boiler operating parameters , the segmental cleaning factor is calculated by the established preheater dust accumulation monitoring model, and finally the output module outputs the segmental real-time cleaning factor of the preheater in the form of a real-time parameter curve. Aiming at the shortcomings and deficiencies of the overall ash accumulation monitoring method of the existing power plant preheater, the present invention proposes the idea of ​​segmental ash accumulation monitoring, and establishes a segmental ash accumulation monitoring calculation model, which can provide visual data on the ash accumulation of the preheater, and can It helps operators to judge the proper timing of soot blowing and carry out segmental soot blowing, thereby reducing the steam loss of the soot blower and improving the heat transfer efficiency of the preheater.

Description

technical field [0001] The invention belongs to the technical field of boiler dust accumulation monitoring, in particular to a segmental dust accumulation monitoring method for a rotary preheater with three compartments. Background technique [0002] At present, coal-fired boilers in large-scale power stations mostly use three-chamber rotary preheaters to recover flue gas heat to preheat air, thereby enhancing combustion, reducing exhaust gas temperature and improving boiler efficiency. The heat transfer element of the three-chamber rotary preheater is composed of closely arranged heat storage plates. Due to its compact structure and narrow working medium passage, it is easy to accumulate dust and even block the working medium passage, resulting in increased smoke air flow resistance. The heat transfer efficiency is reduced, which affects the normal operation of the preheater, so it must be cleaned frequently by soot blowing. [0003] The heat transfer elements of the three...

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Problems solved by technology

The heat transfer element of the three-chamber rotary preheater is composed of closely arranged heat storage plates. Due to its compact structure and narrow working medium passage, it is easy to accumulate dust and even block the working medium passage, resulting in increased smoke air flow resistance. The heat transfer efficiency is reduced, which affects the normal operation of the preheater, so it must be cleaned frequently by soot blowing

However, power plant operators usually judge the soot accumulation degree of the preheater according to the pressure difference between the inlet and outlet of the flue gas. This method can only roughly judge the overall ash accumulation situation of the preheater, and cannot carry out segmental monitoring, so only experience will lead to soot blowing Frequent steam loss is too large, or the soot blowing is not timely and the heat transfer efficiency of the preheater is reduced

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