JPH01258701A - Film evaporator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thin film evaporator, and more particularly to a thin film evaporator used in an evaporative concentration process and a thin film evaporator suitable for its heating method.

[Prior art 1] As shown in FIG. 3, in a conventional thin film evaporator, a treatment liquid is supplied into a cylindrical body 5 from a treatment liquid volume 1, and the liquid is pressed against the inner surface of the cylindrical body 5 by a rotary blade 6. Forms a thin liquid film. The liquid was heated from a heating jacket 2 provided on the outside (outer circumference) of the cylindrical body 5, the evaporated material was taken out of the system from the evaporated material outlet 8, and the concentrate was taken out of the system from the concentrate ratio lower. . Furthermore, the heating jacket 2 was equipped with a heat medium inlet 3 and a heat medium outlet 4.

As described above, the conventional heating method for a thin film evaporator has been a method of heating from the outside using steam, hot oil, an electric heater, or the like. Further, as a heating method using microwaves, there is mentioned ``Dehydration Apparatus'' in Japanese Utility Model Publication No. 59-33996.

[Problem to be solved by the invention] The above conventional technology does not take into account the thermal deterioration and evaporation capacity of the product, and because it uses an external heating method using steam, electric heaters, etc., the product deteriorates due to heat in the extreme parts. There were issues such as: Furthermore, since dehydration equipment using microwaves is a batch type, bumping of evaporated materials is likely to occur, and the evaporation ability decreases depending on the depth of the liquid, making it difficult to evaporate.

An object of the present invention is to provide a thin film evaporator that does not cause thermal deterioration and has high evaporation capacity.

[Means for solving the problem 1 The above purpose is to provide a microwave generator on the outer periphery of the cylindrical body that irradiates the liquid to be treated with microwaves, and to continuously renew the liquid to be treated as a thin liquid film using rotary blades. This is achieved by:

[Function 1 The liquid to be treated, such as tomato juice, is sent into a container equipped with an external microwave generator, and is turned into a thin liquid film by a rotary blade. The liquid to be treated self-heats due to microwaves, generates the amount of heat necessary for evaporation, and easily evaporates from the surface of the liquid film. In addition, the liquid to be treated is subjected to centrifugal force at the tip of the rotating blade and is forced onto the inner wall of the cylindrical body, and as the liquid passes through the small gap between the rotary blade and the cylindrical body, it becomes a thin film and easily evaporates. Become.

Furthermore, the liquid is frequently stirred by rotary blades, making evaporation even easier.

[Embodiment J] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, the processing liquid is supplied into the cylindrical body 5 from a process liquid port 1, and the liquid is forced onto the inner surface of the cylindrical body 5 by rotation R6 to form a thin liquid film. The liquid is outside (outer circumference) of the cylindrical body 5
The liquid is irradiated with microwaves from a microwave generator 9 installed in the liquid film, self-heats due to the microwaves, generates the heat necessary for evaporation, and evaporates from the surface of the liquid film. The evaporated matter is discharged out of the system from the evaporated matter outlet 8, and the concentrate is discharged out of the system from the concentrate outlet lower.

Further, the portion of the microwave generator 9 may be configured by providing a waveguide connected to the microwave generator.

The detailed structure of the microwave generator 9 is shown in FIGS. 3 and 4. In FIG. Numerous small holes 13 are opened in order to irradiate microwaves. The microwave generator 9 is installed on the outer periphery of the waveguides 10a and 10b, and is guided to the outer periphery of the cylindrical body by the waveguide and irradiates the processing liquid 12 which has been made into a thin film. Also, since this waveguide is installed in multiple stages in the axial direction of the evaporator, the waveguides lOa, l
A barrier 11 is installed between the ob.

According to this embodiment, 1. For example, in the case of tomato juice, if the operation is carried out with the inside of the cylindrical body under atmospheric pressure, the water will self-heat due to microwaves and will evaporate, so the liquid temperature will rise to 100°C. The temperature never rises above ℃, so the temperature of the liquid does not rise to an extreme level, preventing thermal deterioration of the product. In addition, since the liquid is constantly renewed as a thin liquid film by the rotary blades, it is easily evaporated and a high evaporation capacity can be obtained.

From the above advantages, it is possible to construct a thin film evaporator that does not cause thermal deterioration and has a high evaporation capacity, and allows continuous concentration operation.

[Advantageous Effects of the Invention 1] According to the present invention, since the temperature of the liquid does not rise to an extreme level due to self-heating caused by microwaves, thermal deterioration of the product can be prevented. Further, since the liquid is constantly renewed as a thin liquid film by one rotary blade, it is easy to evaporate and a high evaporation capacity can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a thin film evaporator according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line I-1 in FIG. 1, and FIG. 3 is a plan sectional view of a microwave generator of the present invention. FIG. 4 is a longitudinal sectional view, and FIG. 5 is a longitudinal sectional view of a conventional thin film evaporator. 1------1 processing liquid inlet, 2------1 heating jacket, 5-----1 cylindrical body, 6-----1 rotor blade,
7------One concentrate outlet, 8-----One evaporate outlet, 7r1 figure';

Claims (1)

[Claims] 1. A thin film evaporator that has a rotor that rotates with a small gap between the inner wall of the cylindrical body and the inner wall of the cylindrical body. 1. A thin film evaporator, characterized in that a microwave generator is provided in the evaporator, and the microwave of the microwave generator generates self-heating of a liquid to be treated.