A Method for Shutdown of a Once-through Boiler with Sliding Parameters

Abstract

The invention provides a method of sliding parameter furnace shutdown for a once-through boiler. The method comprises the following steps of: 1) after a generator set is stopped, preventing the once-through boiler from flameout; and 2) controlling the burning capacity of the once-through boiler at 10-20%, and switching on high-pressure and low-pressure bypasses of a turbine when a steam-water separator of the once-through boiler satisfies a first predetermined condition, wherein the once-through boiler is quickly cooled. According to the method of sliding parameter furnace shutdown for the once-through boiler provided by the invention, compared with the prior art, the temperature of the once-through boiler can be reduced to an overhaul temperature within a shorter time.

Description

technical field [0001] The invention relates to the technical field of power plant production, in particular to a method for shutting down a once-through boiler with sliding parameters. Background technique [0002] In the production process of a power plant, a generator set (mainly composed of a once-through boiler, a steam turbine, a generator and related bypasses) generates economic profits based on long-term stable operation. , It is necessary to shut down the generator set for maintenance according to the plan, and accordingly, it is necessary to shut down the once-through boiler according to the plan. [0003] At present, the industry mainly adopts the method of shutting down the boiler with sliding parameters, specifically: keep all the regulating valves of the steam turbine fully open, so that the combustion of the once-through boiler is gradually weakened, thereby gradually reducing the steam output to the steam turbine until the boiler is shut down. [0004] The c...

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Problems solved by technology

[0004] The cooling curve of the once-through boiler using the existing sliding parameter shutdown method is as follows figure 1 shown, from figure 1 It can be seen from the figure that it takes 72 hours to reduce the temperature of the once-through boiler from the initial temperature (for example, about 420°C) to the maintenance temperature (for example, about 60°C), which takes a long time, which not only wastes power resources, but also affects normal production

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