A start-up control method for a power station drum boiler

Abstract

The invention discloses a start control method of a power station drum boiler. According to the method, after a normal water level is reached by feeding water into the boiler, firstly boiler body blowoff valves and boiler body drain valves are closed before ignition; and then a high-pressure bypass adjusting valve is fully opened, a low-pressure bypass adjusting valve is opened to a preset openingdegree, a vacuum system is utilized for reducing the pressure of a steam pocket, superheaters and reheaters to the vacuum state, the saturation temperature of boiler water is decreased, the densitiesof air in all heating surface pipelines are decreased, accordingly, the air resistance in the pipelines is decreased, pressure required for steam flowing is reduced, and steam flowing is smoother. Steam produced by the boiler passes through the boiler superheaters, a high-pressure bypass, reheaters and a low-pressure bypass in sequence to enter a condenser or a steam exhaust device, the steam enters the boiler superheater and reheater heating surfaces at the same time, the dry ashing time of all the heating surfaces is shortened, the safety of metal of all the heating surfaces is guaranteed,the risk of leaking of the heating surfaces is lowered, meanwhile, exhausted steam during start of the boiler is recovered, wasting of water resources is avoided, and the purpose of working medium recovery is achieved.

Description

technical field [0001] The invention relates to the technical field of electric power equipment, in particular to a start-up control method of a steam drum boiler in a power station. Background technique [0002] Power station steam drum boiler is a special equipment for the power industry. The boiler is a device that converts chemical energy generated by fuel combustion into heat energy. The heat of the flue gas in the boiler furnace and flue passes through the metal tubes on each heating surface to heat the water or steam in it to the pressure and temperature required by the process. [0003] The traditional power station drum boiler start-up method generally uses the boiler pressure method to start. During the start-up process, it is ignited directly. After the drum pressure or superheater pressure rises, close the boiler body emptying door. In this method, before closing the emptying door, the steam is directly discharged into the atmosphere, resulting in a waste of wat...

AI Technical Summary

Problems solved by technology

In this method, before closing the emptying door, the steam is directly discharged into the atmosphere, resulting in a waste of water resources; and when the emptying door and the drain door are closed, it is easy to cause a large instantaneous fluctuation in the metal temperature of the panel superheater, resulting in a large Thermal stress can easily cause oxide skin to fall off; in addition, before the bypass is turned on, the reheater is in a dry state, and the moment it is turned on, steam enters the reheater, causing large fluctuations in the metal temperature of the reheater, and the same effect on the metal on the heating surface of the reheater Security poses a great threat

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