Thermal power plant dead steam condensed water and waste heat recovery system and method

Abstract

The invention discloses a thermal power plant dead steam condensed water and waste heat recovery system and method. The system comprises a low-temperature condensed water pipe, a mixed dead steam recoverer, a water tank, a non-condensable gas emptying pipe, a dead steam emptying pipe, a periodic blowdown flash tank, a water-sealed valve and a dead steam recovery pipe. An outlet of the low-temperature condensate pipe is communicated with a cooling water inlet of the mixed type dead steam recoverer, a bottom outlet of the mixed type dead steam recoverer is communicated with a top inlet of the water tank, and a top outlet of the mixed type dead steam recoverer is communicated with a dead steam emptying pipe through a non-condensable gas emptying pipe. An inlet of the waste steam emptying pipe is communicated with the periodic blowdown flash tank through a water-sealed valve, a pipeline between the water-sealed valve and the periodic blowdown flash tank is communicated with a waste steam inlet of the mixed waste steam recoverer through a waste steam recovery pipe, a waste steam recovery shut-off valve is arranged on the waste steam recovery pipe, and the system and the method can safely and efficiently recover flash waste steam.

Description

technical field [0001] The invention belongs to the field of exhaust steam condensate and waste heat recovery of thermal power plants, and relates to a thermal power plant exhaust steam condensate and waste heat recovery system and method. Background technique [0002] The expansion vessel for periodic sewage discharge in thermal power plants mainly accommodates emergency water release from the steam drum, emergency water discharge from the deaerator, drainage from the continuous blowdown expansion vessel, drainage from the soot blower, and other boiler sewage. The discharge port is discharged, and the flash steam is discharged from the exhaust pipe above the regular blowdown expansion vessel. [0003] Due to the low pressure of flash exhaust steam in the regular blowdown expansion vessel, it is generally around 0.02MPa, and the enthalpy is around 2600kJ / kg. The discharge of flash exhaust steam in the regular sewage expansion container of thermal power plants can reach 2 to...

AI Technical Summary

Problems solved by technology

The traditional treatment method is to discharge the flash waste steam to the air in an orderly manner through the emptying pipe above the regular blowdown expansion vessel. The disorderly discharge of the flash steam will increase the water supply of the power plant, increase the cost of desali

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