Feed water control method for supercritical concurrent boiler without boiler-water circulating pump

Abstract

A feed water control method for a supercritical concurrent boiler without a boiler-water circulating pump includes providing a supercritical concurrent boiler system without the boiler-water circulating pump. The supercritical concurrent boiler system without the boiler-water circulating pump comprises a feed water flow control valve and a steam separator regulating valve. The feed water flow for load of concurrent operation of the concurrent boiler from starting to drying state is preset. Actual feed water flow during concurrent operation process of the concurrent boiler from starting to drying state is obtained by dynamically regulating opening degree of the steam separator regulating valve to regulate preset feed water flow. The feed water flow entering the boiler is adjusted by regulating the opening degree of the steam separator regulating valve. The feed water control method for the supercritical concurrent boiler without the boiler-water circulating pump is easy to realize by common control equipment.

Description

Technical field [0001] The invention relates to a control method of a boiler-free water circulating pump supercritical once-through boiler. Background technique [0002] At present, many large-scale thermal power unit supercritical once-through boilers are not equipped with boiler water circulation pumps, so the feedwater during the boiler startup stage is provided directly by the feedwater pump, and the water in the steam-water separator returns to the condenser, so that the energy of the water in the condenser is returned. Cannot be recycled. Take a once-through boiler with a minimum feed water flow rate of not less than 25% of the maximum continuous output required by the boiler factory as an example. In order to ensure the safe operation of the boiler, the boiler plant requires that the minimum feed water flow is not less than 25% of the maximum continuous output of the boiler, so the boiler water volume of the reflux separator during the start-up phase consumes a lot of ene...

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Problems solved by technology

At the same time, due to the small flow of steam entering the superheater, the part entering the convective heating surface is relatively stable Q 对流 The heat of the superheated steam is too high due to the reduction of the steam flow rate. It is necessary to increase the amount of desuperheating water to control the steam temperature. Increasing the desuperheating water will increase the energy consumption of the feed water pump.

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