Forced-cooling drain flash tank and utilization method thereof

Abstract

The invention discloses a forced-cooling drain flash tank, which comprises a flash tank body with a conical upper portion and a cylindrical lower portion. The top of the flash tank body is provided with a steam outlet, the upper portion is provided with a drain inlet, the lower portion is provided with a drain outlet, and the bottom is provided with a sewage outlet. A cooling heat exchange tube bundle is arranged at the inner top of the flash tank body, an inlet and an outlet of the cooling heat exchange tube bundle are provided with a condensate inlet and a condensate outlet respectively, a check valve is arranged at the condensate inlet, and an electric regulating valve and a temperature sensor are arranged at the condensate outlet. The invention further discloses a utilization method ofthe forced-cooling drain flash tank. By arrangement of the cooling heat exchange tube bundle at the top steam outlet of the drain flash tank, steam recycling is further promoted, steam emission is reduced, and accordingly visual pollution caused by steam emission is reduced.

Description

technical field [0001] The invention relates to the field of energy saving and emission reduction in thermal power plants, in particular to a forced-cooling hydrophobic expander and a method for using the same. Background technique [0002] The thermal power plant burns the fuel in the boiler, releases the heat, and transfers it to the water in the boiler to generate high-temperature and high-pressure steam. The steam passes through the steam turbine and converts heat energy into rotational power to drive the generator to output electric energy. In the process of power generation, a large amount of steam needs to be generated to drive the generator. After the steam drives the generator, it will be discharged, and the discharged steam contains a large amount of heat energy. In order to further utilize the energy, the steam needs to be The energy is recovered and utilized, while reducing the pressure of the steam to ensure safe discharge. [0003] The recycling and depressuri...

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Problems solved by technology

[0003] The recycling and depressurization of steam are inseparable from the use of the drain expander. The existing drain expander is to expand and reduce the pressure of the drain in the pressure drain pipeline to separate the steam and drain, and the drain is introduced into the drain tank. Regularly sent to the water supply system, and the excess steam will be discharged into the atmosphere after depressurization. Because the steam contains rich heat energy, when it is discharged into the atmosphere, it will form a large amount of water mist when it encounters cold air, forming a visual appearance like white smoke. Pollution, but also reduces the recovery efficiency of heat energy

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