Low-load water supply circulating system for power station boiler

Abstract

The invention relates to the technical field of thermoelectric equipment, in particular to a low-load water supply circulating system for a power station boiler. The low-load water supply circulatingsystem comprises a circulating pipe, and an inner sleeve frame is connected to the circulating pipe in a sleeving mode. A driving wheel and a limiting wheel are arranged on the inner sleeve frame, andan outer sleeve is fixedly arranged on the inner sleeve frame. A sliding rail is fixedly arranged on the inner sleeve frame, and a heat insulation plate is arranged in the sliding rail in a sliding mode. A rack is fixedly arranged on the heat insulation plate, a gear is engaged on the rack and fixedly arranged on a driving shaft, and the driving shaft is connected to a synchronous motor through abelt wheel pair. The whole system can be driven to move on the circulating pipe through the arranged driving wheel, and the system is stopped at the high-temperature local part of the circulating pipe in cooperation with detection of a temperature sensor. Effective heat dissipation of the circulating pipe is conducted, so that the situations that due to low-load operation of the boiler, a pipeline is locally overheated, the overheated part is decarburized, and the heated surface is thinned are prevented, and pipe explosion is avoided.

Description

technical field [0001] The invention relates to the technical field of thermoelectric equipment, in particular to a low-load feedwater circulation system for power plant boilers. Background technique [0002] In a power station, due to the relationship between the grid capacity and the power load, sometimes it is necessary to require the power plant to produce according to the specified power generation load, which results in a low-load operation, and the load of the generator is lower than the normal power generation. Generally, it is done by the operator by adjusting the opening of the guide vane of the governor, but the low-load operation will cause certain harm to the entire power generation equipment, mainly including affecting the normal production, affecting the life of the heat exchange pipe inside the boiler, and increasing the heat exchange at the tail Corrosion of pipes, affecting the thermal efficiency of boilers, etc. [0003] The harm of low load to the water ...

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Problems solved by technology

[0002] In a power station, due to the relationship between the grid capacity and the power load, sometimes it is necessary to require the power plant to produce according to the specified power generation load, which results in a low-load operation, and the load of the generator is lower than the normal power generation. Generally, it is done by the operator by adjusting the opening of the guide vane of the governor, but the low-load operation will cause certain harm to the entire power generation equipment, mainly including affecting the normal production, affecting the life of the heat exchange pipe inside the boiler, and increasing the heat exchange at the tail Corrosion of pipes, affecting the thermal efficiency of boilers, etc.

[0003] The harm of low load to the water supply circulation system is mainly manifested in the pressure caused by the hot water pipe and steam pipe. Due to the low load operation, the furnace flame is less, resulting in local heating of the heating surface. As the heating surface becomes smaller, the entire circulation system The natural power will also become smaller, resulting in local overheating of the pipeline, which will easily decarburize the overheated part, thin the heating surface, and easily cause tube explosion. In view of this, we propose a low-load water supply circulation system for power plant boilers

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