Boiler blowdown recycling method and device

Abstract

The invention relates to the technical field of boiler blowdown recycling, in particular to a boiler blowdown recycling method and device. The method comprises the following steps that boiler continuous blowdown water enters a continuous blowdown flash tank to obtain saturated steam and high-temperature water, the high-temperature water and system drainage water discharged into a periodic blowdowntank are subjected to flash evaporation to obtain exhaust steam, the exhaust steam enters an absorption tower to be liquefied to obtain high-temperature water, and the high-temperature water enters agas-water separation device to separate non-condensable to be discharged, and then enters a deaerator. The device comprises the continuous blowdown flash tank, the periodic blowdown tank, the absorption tower and the deaerator, wherein a high-temperature water outlet of the continuous blowdown flash tank is connected with a high-temperature water inlet of the periodic blowdown tank, an exhaust steam outlet of the periodic blowdown tank is connected with an exhaust steam inlet of the absorption tower, and a high-temperature water outlet of the absorption tower is connected with a high-temperature water inlet of the deaerator. According to the boiler blowdown recycling method and device, the national energy-saving policy requirement is met, the energy saving effect is obvious, the working environment is completely changed, the environmental thermal pollution is reduced, the atmospheric environment is improved, the carbon emission is reduced, resources are saved, the resource utilizationtime is prolonged, and good economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of recycling boiler blowdown, in particular to a method and device for recycling boiler blowdown. Background technique [0002] A thermal power plant refers to a thermal power plant that can use steam extraction or exhaust steam from a steam turbine to provide heat to users while generating electricity. High-pressure boiler is one of the indispensable equipment of thermal power plant. It discharges a large amount of sewage during operation, and the sewage discharge can reach 10 tons per hour. [0003] One existing technology is to lead the continuous drainage of the boiler to the continuous expansion vessel for flash evaporation, and the 0.35MPa steam obtained by the flash evaporation is sent to the steam inlet pipeline of the deaerator, and the continuous high-temperature water is sent to the regular sewage discharge pipe, and then Discharged to the ditch by a fixed row. Due to the long distance between t...

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Problems solved by technology

[0005] Aiming at the problems of the prior art that continuous drainage is discharged without utilization, which causes a large amount of heat waste and great thermal pollution, the present invention provides a method and device for recycling boiler sewage. The method conforms to the national energy-saving policy and significantly saves energy The effect can completely change the working environment, reduce environmental heat pollution and improve the atmospheric environment. At the same time, it can reduce carbon emissions, save resources, and prolong resource utilization time, which has far-reaching significance for enterprises and the country; At the same time, the steam is flashed out, and the desalted water is recovered and put into the pipeline network for operation, which realizes the closed recovery and utilization of steam condensate and exhaust steam, fully reduces energy loss, saves the amount of desalted water, and reduces consumption. good economic benefits

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