JPH0286801A - Concentration method and device - Google Patents

Abstract

PURPOSE:To eliminate the need for steam equipment and to reduce equipment cost by using a high-temp. gas as a heating medium, and circulating the gas by a compressor at the time of vaporizing and concentration a processing soln. attached on the inner surface of a cylindrical vessel by the heating medium flowing into the jacket on the surface of the vessel. CONSTITUTION:The processing soln. flowing into the cylindrical vessel 1 is attached on the inner surface of the vessel 1 by the action of a rotor 12 provided in the vessel 1. The processing soln. attached on the inner surface of the vessel 1 is vaporized and concentrated by the heating medium flowing into the jacket 2 provided on the outer surface of the vessel 1. In this case, a high- temp. gas is generated by the compressor 7 provided on the upstream side of the jacket 2, used for vaporizing the processing soln. attached on the inner surface of the vessel 1, and then returned to the compressor 7. Namely, since steam in not used as the heating medium, steam equipment is dispensed with, and the equipment cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a concentrating device, particularly for concentrating liquids and mixtures of solids and liquids by evaporation.

The present invention relates to a drying concentration method and apparatus.

[Conventional technology]

Generally, when concentrating a mixture of a liquid and a solid by evaporation, the most common method is to form the mixture into a thin film and heat it with a heating medium. Figure 3 shows a typical example. In the figure, a rotating body is provided inside the evaporator 1. There is a jacket 2 on the outside of the evaporator 1. A heat medium enters the jacket 2 through a heat medium inlet 5 and exits through a heat medium outlet 6. The heating medium heats the cylindrical container of the evaporator l. The mixed liquid entering from the processing liquid port 3 is attached to the inner surface of the cylindrical container of the evaporator L in a thin film form by the rotating body U.
It is heated and concentrated by a heating medium, becomes a product with a predetermined concentration, and is discharged from the product outlet 4.

Usually, water vapor is mainly used as the second heating medium. Incidentally, related devices of this type include, for example, Japanese Patent Application Laid-Open Nos. 62-279801 and 59-29001.
For example, the number etc.

[Problem to be solved by the invention]

The above conventional technology does not consider equipment costs,
The heat medium used is overwhelmingly water vapor.In other words, when using this evaporator, steam generation equipment is always required, and in addition to the evaporator, it is also necessary to spend money on a second utility equipment. Ta.

An object of the present invention is to provide a concentration method and device that eliminates equipment costs necessary for this utility equipment.

[Means to solve the problem]

The above object is achieved by using a compressor to circulate high-temperature gas instead of using steam as a heating medium.

A large amount of high-temperature gas can be easily obtained by using discharged gas from a compressor (blower).

[For production]

A compressor (blower) is a machine that generates high-pressure gas and also a machine that generates high-temperature gas using the heat of compression. The high-temperature gas generated here is heated and evaporated by the jacket of the generator, thereby making it possible to concentrate the processing liquid. In addition, when using the gaseous heat medium contained in the processing liquid, the evaporation efficiency can be increased by supplying the gas to a compressor (blower) and guiding the heated gas directly to the processing liquid inside the steamer. can be increased.

〔Example〕

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

FIG. 1 shows an embodiment of the indirect heating method. In the figure, in the evaporator II which has a built-in rotary stop, the processing liquid flows in from the processing liquid port 3, is heated and evaporated and dried, and is then discharged from the product outlet 4. A jacket 2 is installed around the evaporator,
A heat medium inlet 8 and a heat medium outlet 9 of the jacket are connected to an outlet and an inlet of a compressor (blower) 7. The compressor (blower) used here is required to have a large calorific value, so a positive displacement type such as a screw type or roots type is preferable.

The heating medium now coming out of the compression fi (blower) 7 is pressurized.

Since it is heated, it becomes a high-temperature gas and flows into the jacket 2. Inside the jacket 2, heat is applied to the processing liquid inside the vaporized AnI, and the temperature of the gas is lowered.

Moreover, the pressure decreases within the jacket 2 due to the flow of gas, and the gas flows into the inlet of the compressor (blower). In this way, the heat medium circulates between the jacket 2 and the compressor (blower) 70 while repeating pressure increase, heating, cooling, and pressure reduction. As a result, in the evaporator 1, the processing liquid is concentrated by absorbing the heat of the heating medium (this method is called an indirect heating method because the heating medium and the processing liquid do not come into direct contact with each other).

FIG. 2 shows an embodiment of the direct heating method.

In the figure, when gas is mixed in the processing liquid, the mixed liquid enters the separator 10 from the liquid mixture 11 and is separated into gas from the upper part and processing liquid from the lower part. The processing liquid discharged from the lower part enters the evaporator 1 through the processing liquid port 3. The gas flowing out from the upper part enters the pressure Al1 machine (blower) 7, is pressurized and heated, and enters the evaporator l through the heat medium inlet 8. A rotating body is installed inside the evaporator 1, and the treated liquid is heated and concentrated by a heating medium, separated into a concentrate and a gas, and the concentrate is transferred to the next process through a product outlet 4. . The gas enters the compressor (blower) 7 again through the heat medium outlet 9 together with the heat medium. This method is called a direct heating method because the processing liquid and heating medium are used together.

According to this embodiment, since steam is not used, the entire apparatus becomes compact, and there are fewer problems such as material corrosion due to steam, and the effect of reducing material costs can be expected. Furthermore, as shown in FIG. 2, the method of heating the heating medium by directly introducing it into the evaporator is efficient and makes the equipment more compact.

Furthermore, by controlling the capacity of the blower, the amount of heat medium circulated can be increased or decreased, the amount of heating can be changed, and the concentration ratio can be controlled.

Furthermore, in the case of the direct heating method, since the heating medium is introduced into the evaporator, the concentrate can be pumped by the wind pressure of the heating medium.

〔Effect of the invention〕

According to the present invention, there is no need to use steam as a heating medium, and therefore no steam equipment is required, which has a great effect on reducing equipment costs.

[Brief explanation of drawings]

FIG. 1 is a schematic system diagram of a concentrator according to an embodiment of the present invention, FIG. 2 is a schematic system diagram of a concentrator according to another embodiment of the present invention, and FIG. 3 is a schematic system diagram of a conventional concentrator. be. 1... Evaporator, 2... Jacket, 7... Compression

Claims (1)

[Claims] 1. A rotating body is provided inside the cylindrical container, and the processing liquid flowing into the cylindrical container is attached to the inner surface of the cylindrical container by the action of the rotating body, and a jacket is provided on the outer surface of the cylindrical container, In the concentration method of evaporating and concentrating the processing liquid adhering to the inner surface of the cylindrical container by means of a heating medium flowing into the jacket, a compressor provided on the upstream side of the jacket generates high-temperature gas, and the generated high-temperature gas is transferred to the A concentration method characterized in that the processing liquid adhering to the inner surface of a cylindrical container is used for evaporative concentration and then returned to the compressor. 2. A rotating body is provided inside the cylindrical container, and the processing liquid flowing into the cylindrical container is attached to the inner surface of the cylindrical container by the action of the rotating body, and a jacket is provided on the outer surface of the cylindrical container, and the processing liquid flows into the jacket. A concentrator for evaporating and concentrating a treated liquid adhering to the inner surface of a cylindrical container using a heating medium, a compressor is disposed upstream of the jacket, the outlet of the compressor is connected to the inlet of the jacket, and the outlet of the jacket is connected to the inlet of the jacket. A concentrator characterized in that the inlet of the compressor is connected to the inlet of the compressor. 3. In claim 2, the jacket of the cylindrical container is omitted, a separator is provided on the upstream side of the treated liquid, the lower part of the separator communicates with the treated liquid inlet of the evaporator, and the A concentrator characterized in that an upper part is connected to a compressor inlet, a compressor outlet is connected to an evaporator heat medium inlet, and an evaporator heat medium outlet is connected to a compressor inlet.