Heat-engine plant boiler start steam water system and start-stop control method thereof

Abstract

The invention provides a heat-engine plant boiler start steam water system and a start-stop control method thereof. The system comprises a water feeding adjustment valve, a coal economizer, a water-cooling wall, a mixed collection box, a steam water separator, an overheater, a water storage tank, a boiler water circulating pump, a boiler water circulating pump outlet adjustment valve, a drainage collection box, two drainage pumps and a plurality of pipes. The coal economizer is connected with the water-cooling wall, and the water-cooling wall penetrates through the mixed collection box to be connected with the steam water separator; and the water feeding adjustment valve is arranged between a boiler water feeding pump and the coal economizer. The overheater is connected with a steam outlet in the upper portion of the separator; and the water storage tank is connected with a water outlet in the lower portion of the separator. The two ends of the boiler water circulating pump are provided with an inlet electric door and an outlet electric door correspondingly, and a recycling electric door is arranged between a water outlet of the boiler water circulating pump and the water storage tank. The boiler water circulating pump outlet adjustment valve is arranged between the outlet electric door and the coal economizer. A water discharging electric door and a water discharging adjustment valve are arranged between the water storage tank and the drainage collection box. The two drainage pumps are connected in parallel and are arranged at a drainage opening of the drainage collection box, inlets are all provided with filter screens, and outlets are provided with the outlet adjustment valve.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, in particular to a start-up steam-water system for a boiler in a thermal power plant and a start-stop control method thereof. Background technique [0002] The start-up steam-water system of a thermal power plant boiler mainly includes devices such as a steam drum, an economizer, a water wall, a superheater, and a condenser. The steam drum is an important part of the natural circulation boiler and the forced multiple circulation boiler. It is equipped with steam-water separation device, steam cleaning device and other equipment, which can effectively carry out steam-water wind and steam cleaning. It is the distribution center of boiler steam and water. The economizer is composed of many parallel serpentine tubes and inlet and outlet headers. It mainly uses the heat of the flue gas at the tail of the boiler to heat the heat exchange of the boiler feed water to save fuel. The wate...

AI Technical Summary

Problems solved by technology

However, the existing thermal power plants cannot realize the automatic start of the boiler start-up soda-water system when the boiler start-up soda-water system is completely stopped, and cannot realize the automatic stop of the boiler start-up soda-water system when the boiler start-up soda-water system is running, and when the boiler starts When the soda system start-up program runs to a certain step, if the step condition is not met, the start-up program cannot continue to run

That is, the operation and stop of the existing boiler start-up steam-water system requires human intervention, which greatly increases the workload and labor costs, and if the boiler start-up steam-water system cannot be started or stopped in time, serious accidents may occur

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