Operation method of mvr evaporation system for radioactive waste liquid in nuclear power plant

Abstract

The invention discloses a nuclear power plant radioactive waste liquid MVR evaporation system, which includes a preheater, an evaporation tower, a circulation pump, a heater, a steam compressor, an electric heating device and a distillation tank. The heater is located outside the evaporation tower, and one side inlet of the heater is Both the outlet and the outlet are connected to the evaporation tower, the evaporation tower is also connected to the steam compressor, the outlet of the steam compressor is connected to the inlet on the other side of the heater, the outlet on the other side of the heater is connected to the distillation tank, and the two ends of the electric heating device are respectively connected to the distillation tank and the other side entrance of the heater. Based on the above operation steps of the evaporation system, it includes step a: start the liquid inlet pump, and add the feed liquid to be processed to the evaporation tower to the specified liquid level; step b: start the circulation pump, electric heating device and distillation pump; step c: start Steam compressor, liquid injection pump; step d: turn off the electric heating device and distillation pump. The invention efficiently treats the radioactive waste liquid of the nuclear power plant, reduces radioactive pollution, and recycles the latent heat of the secondary steam generated by the waste liquid.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant radioactive waste liquid treatment and disposal, in particular to an MVR evaporation system for nuclear power plant radioactive waste liquid and an operating method thereof. Background technique [0002] During the operation of nuclear power plants, various radioactive waste liquids will be produced. Many current radioactive waste liquid treatment systems in nuclear power plants use natural circulation evaporators or externally heated forced circulation evaporators. However, both the natural circulation evaporator and the forced circulation evaporator adopt the ordinary normal pressure evaporation process, which needs to continuously input new steam to heat the feed liquid, which consumes a lot of energy. For the large amount of secondary steam generated in the evaporator, the cooling water is directly used for condensation, and the heat energy cannot be recovered and the cooling water...

AI Technical Summary

Problems solved by technology

However, there are still some defects in the existing MVR technology. First, the evaporator mostly uses a rising film or falling film evaporator, and both heating and evaporation occur in the same equipment. The problem of easy fouling on the surface of the evaporator cannot be solved due to boiling and vaporization.

Second, external steam is still needed as the initial starting energy

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