Multi-parameter coupling once-through boiler pipe blowing steam control method

Abstract

The invention discloses a multi-parameter coupled once-through boiler blowpipe steam control method, which relates to the technical field of boiler steam blowpipe, and comprises the following steps: controlling the pressure rise rate of steam in a superheater by adjusting the feed water flow of a water cooling wall, so that the steam can have sufficient heating time in the superheater to be heated into superheated steam; the boosting rate of the steam pressure in the superheater is controlled in an auxiliary mode by controlling the drain valve of the water storage tank, so that it is guaranteed that the pressure in the superheater before pipe blowing does not rise to the pressure needed by pipe blowing. The method has the beneficial effects that by adopting the method, the pressure rising rate of a steam-water system can be well controlled, so that the smoke convection heat absorption time of a superheater is reasonably increased, the superheated steam temperature and superheat degree are increased, the purposes of guaranteeing the pipe blowing effect and safety are achieved, compared with the prior art, the pipe blowing temperature is obviously increased, the total pipe blowing frequency is obviously reduced, and the pipe blowing efficiency is improved. And moreover, the interval time of every two adjacent blowpipes is shortened, and good economic value and field operability are achieved.

Description

technical field [0001] The invention relates to the technical field of boiler blow-pipe steam, in particular to a multi-parameter coupled once-through boiler blow-pipe steam control method. Background technique [0002] like figure 1 As shown, the once-through boiler blowing system mainly includes a steam-water separator 1, a water wall 2, a water storage tank 3, a superheater 4, a steam blowing pipe impingement door 5, a water storage tank discharge valve 6, a boiler water circulating pump 7, and a boiler water circulating pump outlet valve 8 , boiler drain expansion vessel 9, feed water deaerator 10, reheater 11, steam turbine 12, feed water pump 13, condenser 14 and economizer 15. The process flow of the boiler blowing pipe is as follows: the condensed water of the condenser 14 enters the deaerator 10 for deoxygenation and heating, and after being pressurized by the feed water pump 13, it enters the boiler economizer 15 and the water wall 2 in turn to radiate and absorb ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve at least one of the technical problems in the prior art, and to provide a multi-parameter coupling steam control method for once-through boiler blowing pipes, which can solve the problem of rapid rise of steam pressure at the outlet of the superheater during the blowing process of the once-through boiler. The problem of low outlet steam temperature and long blowing time

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