JPS596881Y2 - Multiple effect evaporator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of a multiple effect evaporator with excellent thermal efficiency.

Conventionally, as a method of thermal energy economy in evaporation equipment, the evaporated steam generated from the evaporator can is sucked and compressed by a steam ejector to increase the pressure, and then sent back to the heating can and used as a heating source for the liquid to be evaporated. As a result, self-vapor compression type evaporators that repeatedly use the latent heat of evaporated steam are widely used.

However, in a self-vapor compression type evaporator using this steam ejector, the self-generated steam is compressed and recycled as heating steam, so the driving steam of the steam ejector used for compression is Since most of the steam is surplus, various methods of utilizing this surplus steam have been proposed and implemented from the viewpoint of energy conservation.

The present invention was developed in view of the current situation, and the present invention combines a self-vapor compression type evaporator using a vapor ejector and a conventional vacuum evaporator, and eliminates the surplus of the self-vapor compression type evaporator. A multi-effect evaporator configured so that a part of the steam is used as heating steam for an evaporator connected to the evaporator, and another part is used as driving steam for a steam ejector of an attached vacuum evacuation equipment. , provides a multiplex evaporator with extremely high thermal efficiency.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments and drawings.

1 is an evaporation can, and 2 is a multi-tubular heating can for heating the liquid inside the can.

A part of the evaporated steam generated from the evaporation can 1 passes through the steam conduit 3 and is sucked and compressed by the steam ejector 4, and the discharged steam is supplied to the heating tube 2 and introduced into the heating can 2 through the conduit 5. Heat exchanges between the liquid in the can and the mixed liquid of the liquid to be concentrated introduced through the liquid to be concentrated supply conduit 6, and the condensed water is discharged from the drain discharge pipe 7 to the outside of the system.

At the same time, the heated and boiled liquid flows through the conduit 8 into the evaporation can 1 and self-evaporates, and a part of the concentrated liquid in the can passes through the conduit 5 again, and the liquid to be concentrated is introduced through the conduit 6. The remaining part passes through the conduit 9 and is introduced into the subsequent evaporation can 10 for further self-evaporation.

12 is a live steam supply pipe for operating the steam ejector 4, and 13 is a non-condensable gas discharge pipe.

Further, another part of the steam generated in the evaporation can 1 is supplied through a steam conduit 14 to a multi-tubular heating can 11 for heating the liquid inside the evaporation can 10, where it is introduced through a conduit 15. Heat exchanges with the liquid in the evaporation can 10, and the condensed water flows through the drain discharge pipe 1.
The boiling liquid is discharged to the outside of the thread from 6 and heated at the same time, and the boiling liquid passes through the conduit 17 and flows into the evaporation can 10, where it self-evaporates, and further joins with the self-evaporated liquid introduced through the aforementioned conduit 9 inside the can. A part of the liquid in the can is refluxed to the heating can 11 through the conduit 15, and the remainder is taken out of the system as a concentrated liquid through the concentrated liquid extraction pipe 18.

The evaporated vapor in the evaporator can 10 is led to a mixing condenser 20 by a vapor conduit 19, where it is condensed and liquefied, and then flows down to a hot well 21 by an atmospheric leg.

22 is a non-condensable gas discharge pipe. Behind the mixing condenser 20, there is a steam ejector 24 driven by the steam generated in the evaporator can 1 supplied through the steam conduit 23, and an atmospheric leg that condenses and liquefies the discharged steam and flows it down to the hot well 21. A vacuum evacuation device is installed, which consists of a mixing condenser 25 with a water ring and a water ring type vacuum pump 27, which is equipped with a gas ejector 26 to aerate the non-condensable gas. , and the air leaking into the apparatus, and the inside of the evaporator can is maintained at a constant vacuum pressure.

Note that 28 and 29 are cooling water conduits, and 30 is a driving air introduction pipe.

Through the above continuous operation, the solution is evaporated and concentrated.

As is clear from the above explanation, the multi-effect evaporator of the present invention compresses a part of the steam (decompressed steam) generated in the evaporator can, which is at a high pressure level, in the steam ejector, increases the pressure, and circulates it as a heat source for heating. At the same time as being reused, the other -1 is used as a heat source for heating the evaporation can in the subsequent stage, and the remaining part is used as steam for driving the steam ejector of the vacuum evacuation system, so it is not compatible with conventional multi-effect evaporation equipment. In comparison, the thermal efficiency is extremely high.

In the above embodiments, a forward flow type, externally heated can type double effect evaporator was explained as an example, but a reverse flow type may also be used. It can also be applied to multiple effect evaporators.

Furthermore, although a water ring type vacuum pump with a gas ejector in front was used, it goes without saying that other types of vacuum pumps can also be used.

[Brief explanation of the drawing]

The drawings are schematic illustrations showing the structure of an embodiment of the present invention. 1,10...Evaporation can, 2,11...Heating can, 4,24...Steam ejector, 20,2
5... Mixing condenser, 26... Gas ejector, 27... Water ring vacuum pump.

Claims (1)

[Scope of utility model registration request] A part of the steam generated from the evaporation can at a higher pressure level is suctioned and compressed by a steam ejector, and the discharged steam is supplied to the heating can of the evaporation can, while the other part is supplied to the heating can of the following evaporation can. A multi-effect evaporator characterized in that it is configured to supply the remaining steam to a steam ejector of a vacuum evacuation device.