JPH0141442Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for concentrating a solution by evaporation.

Devices for concentrating solutions by evaporation are used in many industrial fields, including concentration of various industrial raw materials, recovery of solutes and solvents, volume reduction by concentration of waste liquids,
It is widely used for resource recovery and fuel purposes.
Evaporative concentrators require a large amount of heat for evaporation, so they must have high thermal efficiency. However, since the properties of the target solutions are diverse, the format, material, and
It is necessary to select operating conditions, etc. The simplest evaporative concentrators heat the solution directly, but since the solution is directly exposed to high temperatures, indirect heating with steam or other heat carriers is commonly used. In indirect heating, the type and material of the concentrator are selected depending on the properties of the solution, and the type of device is further determined based on the required energy utilization efficiency, capacity of the device, etc.

All of these evaporative concentrators improve the thermal efficiency within the system by recovering the evaporated solvent as drain, or increasing the pressure using steam, a compressor, etc., and using it as a heat source within the system. In order to increase thermal efficiency, the number of constituent devices increases and the combinations become complicated, which poses problems in terms of both cost and maintenance.

This invention aims to actively use the steam generated during the process of concentrating the solvent for processes outside the system. For example, by supplying steam under conditions that can be used for purposes such as heating, It seeks to save steam from steam generators and avoid process complications that arise when increasing efficiency within the system.

That is, the present invention includes a concentrator that evaporates and concentrates a solution by indirect heating with a heating medium, a first heating device that heats the heating medium with a high-temperature fluid, and a heating medium that is placed between the concentrator and the first heating device. It is characterized by a combination of a circulating piping, a gas-liquid separator communicating with the concentrator, and a second heating device that further heats the steam from the gas-liquid separator using the exhaust heat of the high-temperature fluid from the first heating device. The present invention relates to a solution concentrator.

The device of the present invention is capable of adjusting the solvent vapor generated from the concentrator to conditions such that it can be used in a process outside the system, and sending it outside the system.

The device of the present invention is useful for concentrating organic solutions using water as a solvent, and is particularly useful for solutions containing solutes that do not deteriorate at temperatures below 100°C, or for corrosive substances or bad odors in the steam from the concentrator. Suitable for concentrating solutions that do not have the risk of containing substances.

An embodiment of the device of the present invention will be explained with reference to the attached FIG. 1. In the figure, 1 is a solution concentrator, 2 is a first heating device for heat medium, 3 is a steam/water separator, 4 is a circulation line for the solution, 5 is a take-out line for the concentrated solution, and 6 is a device that requires concentration. Solution introduction line, 7
8 is a heating medium circulation line, 8 is a steam line from the steam separator 3 to the second heating device 11, 9 is a line for sending superheated steam out of the system, and 10 is a combustion gas that is an energy source. .

In the present invention, the format of the concentrator 1, the first and second heating devices 2 and 11, and the type of heat medium are not particularly limited. It is economical to use water up to this point, and for use at higher temperatures or when it is difficult to obtain good quality water, it is appropriate to use heat transfer oil.

The steam/water separator 3 can be made integrally with the concentrator 1, and if the arrangement of the equipment and the resistance of the circulation line are appropriately adjusted, a pump can be installed in the circulation lines 4 and 7 for the solution and heat medium. It is also possible to perform circulation using a thermosiphon without using mechanical circulation equipment such as.

Solutions that require concentration are placed in the solution introduction line 6.
The steam enters the concentrator 1, where it is heated to a steam-water mixed state, and enters the steam-water separator 3, where the steam is separated. The concentrated liquid is taken out of the system through a take-out line 5. On the other hand, the heating medium that gives heat to the solution is
The solution is heated in the first heating device 2 (boiler in the case of water), heat is applied to the solution in the concentrator 1, and then returned to the first heating device 2 to be heated again. Since the heat medium circulation line 7 is a closed circuit, the loss of the heat medium is theoretically zero. The heat source of the first heating device 2 is not particularly specified, but combustion gas of petroleum gas is usually used.

The steam separated from the concentrated solution by the steam separator 3 is heated by the second heating device 11 provided downstream of the exhaust gas from the first heating device 2, and becomes superheated steam.
It is taken out of the system and used for other purposes.

As described above, the present invention regards the condenser as a process steam generator and uses the generated steam in the process, thereby providing a simple concentrating device with excellent overall thermal efficiency.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of an embodiment of the device of the present invention. Each symbol in the figure is as follows. DESCRIPTION OF SYMBOLS 1... Concentrator, 2... First heating device, 3... Steam-water separator, 4... Solution circulation line, 5... Concentrated solution take-out line, 6... Solution introduction line, 7... Heat medium circulation line, 8... Steam line from the steam/water separator to the second heating device 11, 9... Line for sending superheated steam out of the system, 10... Combustion gas, 11... Second heating device.

Claims (1)

[Scope of utility model registration request] A concentrator that evaporates and concentrates a solution by indirect heating with a heat medium, a first heating device that heats the heat medium with a high-temperature fluid, piping that circulates the heat medium between the concentrator and the first heating device, and A solution concentrating device characterized by a combination of a gas-liquid separator communicating with a concentrator, and a second heating device that further heats the vapor from the gas-liquid separator using exhaust heat of the high-temperature fluid from the first heating device.