Superheater device adapting to operation on variable working conditions of boiler and control method thereof

Abstract

The invention discloses a superheater device adapting to operation on variable working conditions of a boiler and a control method thereof. The superheater device comprises a steam inlet pipe, a first steam inlet pipeline, a second steam inlet pipeline, a first inlet header, a second inlet header, a first pipe bank, a second pipe bank, a return pipeline, a first outlet header, a second outlet header, a first steam merging pipeline, a second steam merging pipeline, a distribution header, a first stop valve, a second stop valve and a third stop valve. According to the device, the pipe banks are divided into a left part and a right part, and the two parts form a parallel loop or a series loop by adjusting opening and closing of the three stop valves; when a boiler is operated at the rated load, the flow rate of working media in the pipe banks is high, and the two parts of the pipe banks are adjusted for forming the parallel loop; when the boiler is operated at a load reduction mode, the two parts of the pipe banks are adjusted for forming the series loop, the flow rate of the working media in the pipe banks keeps high, and therefore the pipe banks can be well cooled.

Description

technical field [0001] The invention relates to the field of boilers, in particular to a boiler superheater, in particular to a superheater device suitable for boiler operation under variable working conditions and a control method thereof. Background technique [0002] The number of rows of tubes on the heating surface of the superheater on the boiler is designed according to the rated working conditions of the boiler. cooling. However, when the operating conditions of the boiler change, especially when the load is low, the flow rate of the working medium in the superheater tube will decrease accordingly. When it is reduced to a certain value, the phenomenon of superheater tube burst will easily occur, which will seriously affect the safety of the boiler. and economic operation. Contents of the invention [0003] What the present invention aims to solve is the technical problem that the flow rate of the working medium in the existing superheater is too low when the boil...

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Problems solved by technology

[0003] What the present invention aims to solve is the technical problem that the flow rate of the working medium in the existing superheater is too low when the boiler operates under variable conditions, and aims to provide a superheater device suitable for the operation of the boiler under variable conditions. By adding external connecting pipes and valves, the flow direction of the working fluid in the superheater can be changed, so that the flow rate of the working fluid can be maintained when the boiler operates under variable conditions

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