Exhaust steam temperature adjusting device of steam turbine

Abstract

The invention discloses an exhaust steam temperature adjusting device of a steam turbine, which comprises a low-pressure cylinder and a cooling mechanism; the cooling mechanism comprises a cooling assembly, a water conveying pipe, a water return pipe and a cooling groove; the cooling groove is formed in the side wall of the low-pressure cylinder; one end of the water conveying pipe is connected with a water outlet of the cooling assembly, and the other end of the water conveying pipe is connected with a water inlet of the cooling groove; and one end of the water return pipe is connected with the water outlet of the cooling tank, and the other end is connected with the water inlet of the cooling assembly. The exhaust steam temperature adjusting device of the steam turbine provided by the invention achieves the technical effects that the cooling groove is arranged in the side wall of the low-pressure cylinder, the cooling effect is better, the temperature of the low-pressure cylinder can be more evenly reduced in the using process, and therefore it is guaranteed that the exhaust steam temperature is not too high; and the cooling assembly, the water conveying pipe, the water return pipe and the cooling groove form a closed loop, continuous circulating operation can be achieved in the using process, the temperature of the low-pressure cylinder can be kept continuous and stable by flexibly adjusting the water flow in the closed loop in the using process, and therefore the stability of the steam exhaust temperature of the steam turbine is guaranteed.

Description

technical field [0001] The invention relates to the technical field of steam turbine exhaust, in particular to a steam turbine exhaust temperature regulating device. Background technique [0002] Large-scale steam turbines have strict requirements on the exhaust temperature of the low-pressure cylinder. When the temperature exceeds a certain range, it will cause serious damage to the cylinder, rotor, blade, and condenser of the steam turbine. Therefore, a cooling device is usually provided on the low-pressure cylinder. [0003] When the steam turbine is started, empty and under low load, the steam flow rate is too small to take away the heat generated by the blowing friction in the low-pressure cylinder, so that the temperature of the exhaust steam rises, and the temperature of the exhaust cylinder also rises accordingly. Excessively high cylinder temperature will cause large deformation of the cylinder, destroy the consistency of the center line of the static part of the s...

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Problems solved by technology

[0003] When the steam turbine is started, empty and under low load, the steam flow rate is too small to take away the heat generated by the blowing friction in the low-pressure cylinder, so that the temperature of the exhaust steam rises, and the temperature of the exhaust cylinder also rises accordingly. Excessively high cylinder temperature will cause large deformation of the cylinder, destroy the consistency of the center line of the static part of the steam turbine, and cause unit vibration or other accidents in severe cases. The usual cooling method is to spray water to cool down, but the flow rate of cooling water when spraying water It is fixed. When the exhaust steam temperature just exceeds the set value, a large amount of water spray will cause the exhaust steam temperature to drop below the set value, which will have an adverse effect on the low-pressure cylinder; when the exhaust steam temperature is high, If the cooling speed is too slow, it will still have adverse effects on the cylinder, rotor, blade, and condenser of the steam turbine

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