JPS5936583A - Treating device for heating steam and condensate of condenser for waste liquid - Google Patents

Abstract

PURPOSE:To recover the heat energy of condensate and to utilize efficiently the same, by providing a waste liquid preheater which condenses regenerating steam in a combination of a treatment device for heating steam and condensate consisting of a flash tank, a condenser and a condensate collection tank. CONSTITUTION:The vent steam pipe 11 from a flash tank 10 is connected to a waste liquid preheater 17, and the reevaporated steam preheats the waste liquid. The preheated waste liquid is supplied through a waste liquid supply pipe 6 to a waste liquid thickener. The reevaporated steam used to preheat the waste liquid is recovered through a condensate return pipe 18 to a condensate collection tank 14. The need for a condenser is eliminated by this method, and the effective utilization of heat energy is made possible. The required amt. of the heating steam when such a method is adopted is about 90% in contrast with the prior art wherein the required amt. is assumed as 100%. The high effect of economizing heat energy is thus obtd.

Description

Detailed Description of the Invention The present invention relates to a heated steam condensate treatment device for a radioactive waste liquid concentration treatment device in a nuclear power plant), which effectively utilizes reevaporation steam generated from condensation of steam used for heating as thermal energy. The present invention relates to a waste liquid concentrator heated steam condensate treatment device suitable for.

A conventional waste liquid concentrator heated steam condensate treatment device will be explained with reference to FIG.

In FIG. 1, a heating steam pipe 7 is connected to the heating can 2,
The circulation pump 3 heats the waste liquid from the waste liquid inlet pipe 4. The heating and concentration operation is performed while receiving the waste liquid from the waste liquid supply pipe 6.

The waste liquid heated in the heating can 2 flows into the evaporator 1 from the waste liquid outlet pipe 5 and becomes concentrated waste liquid while repeatedly evaporating water.

Note that the evaporated water vapor is led from the top of the evaporator to the condenser condenser for treatment. The steam that heated the waste liquid is approximately 3.5
The condensate having a saturation temperature of Kf/cm"g is discharged from the steam trap 8 at the outlet of the heating can. The condensate discharged from the steam trap is boiled under reduced pressure and flows into the flash tank 10 through the condensate pipe 9. Since it is environmentally undesirable to exhaust the re-evaporated steam generated by boiling under reduced pressure to the outside of the power plant, the vent steam pipe 11 extracted from the top of the flash tank 10 is connected to the condenser 12, and the re-evaporated steam is condensed with cooling water. The condensed re-evaporated steam is led to the condensate collection tank 14 through the condensate pipe 13 and returned to the steam generator by the condensate pump 15.Condenser 1
The cooling water that has cooled the cooling water absorbs the heat of condensation of the re-evaporated steam and is returned to the auxiliary cooling water device a from the cooling water return pipe 16.

In such a conventional method, a condenser with no added value is provided to treat the re-evaporated steam, and cooling water is wasted, which is a waste of energy.

The objects of the present invention are: 1. To provide a system configuration that recovers and effectively utilizes the thermal energy of condensate discharged from a heating can, which has conventionally been wasted.

In order to condense re-evaporated steam generated from condensate discharged from a heating can, the present invention provides a waste liquid preheater that heats and condenses waste liquid in place of a conventional condenser using cooling water. This allows for effective use of energy.

Embodiments of the present invention will be described below with reference to FIG.

Gas IHi is connected to the vent from the flash tank 10 to a waste liquid preheater 17 so that the re-evaporated steam preheats the waste liquid. The preheated waste liquid is supplied to the waste liquid condensation device from the waste liquid supply pipe 6, and the re-evaporated steam that preheated the waste liquid is condensed and collected from the condensate return pipe 18 to the condensate collection tank 14.

By using the reevaporation steam of the condensate discharged from the heating can to preheat the waste liquid, thermal energy can be used effectively without the need for a condenser. When this embodiment is adopted, the required amount of heating steam is about 90% compared to the conventional example, which is 100%, and a large thermal energy saving effect can be obtained. As described above, according to one embodiment of the present invention, as a result of using re-evaporated steam to pre-prepare the waste liquid in the waste liquid preheater, it is possible to reduce the amount of steam required for the heating can.

According to the present invention, by providing a waste liquid preheater that operates using re-evaporated steam, a condenser is not required, and the waste liquid supply temperature is increased by the re-evaporated steam, so the amount of heating steam required for waste liquid concentration operation is reduced. This has the effect of saving energy.

[Brief explanation of the drawing]

FIG. 1 shows a system configuration diagram of a conventional example, and FIG. 2 shows a system configuration diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Evaporator, 2... Heating can, 10... Flash tank, 12... Condenser, 13... Condensate collection tank, 7... Heating steam pipe, 11... Vent steam pipe, 1
7...Waste liquid pre-mowing 1st

Claims (1)

[Claims] 1. A waste liquid concentrator consisting of a heating can, an evaporator, and a circulation pump, which concentrates waste liquid by steam heating, and a flash tank and condenser to process re-evaporated steam generated from the condensation of the steam used for the heating. , a waste liquid concentrator heated steam condensate treatment, characterized in that in a combination of a heated steam condensate treatment device consisting of a condensate collection tank, effective use of thermal energy is achieved by providing a waste liquid preheater for condensing re-evaporated steam. Device.