JPS6345268B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concentration drying apparatus for liquid substances, and more particularly to a concentration drying apparatus suitable for treating organic solvent-based liquid substances containing various organic and inorganic substances.

Wastewater generated from manufacturing plants such as chemical factories and pharmaceutical factories contains organic solvent-based liquid substances containing large amounts of various organic and inorganic substances that cannot be treated with general wastewater treatment methods such as the activated sludge method. . This type of liquid substance cannot be disposed of as is, so it is treated by some means such as incineration, but during this treatment, the entire amount of volatile components such as organic solvents is recovered before effective reuse. In addition, it is required that the non-volatile components such as organic and inorganic substances remaining after volatile component recovery be in a solid state that is easy to handle, and that maintenance and management throughout the entire process be as easy and economical as possible. .

Conventionally, there are the following devices for processing this type of liquid substance. The most common type of device is an evaporation concentration device that heats and evaporates a liquid material using a sleeve-type heat exchanger or a plate-type heat exchanger, and then separates and concentrates the evaporated volatile component vapor using a gas-liquid separator. However, due to its nature, this conventional device leaves a portion of the volatile components behind and can only be used within the range where a certain degree of fluidity can be obtained in the liquid substance, so it is inevitably impossible to recover all of the volatile components. It is. Furthermore, as the volatile components from the liquid substance evaporate, the concentration of mixed organic and inorganic substances gradually increases, and these organic and inorganic substances begin to exhibit phenomena such as mutual fixation, polymerization, adhesion, and deposition. However, as non-volatile components such as organic and inorganic substances in such a state adhere to the heat transfer surface of the heat exchanger as described above, the heat transfer efficiency is significantly reduced, and furthermore, it is necessary to scrape off the attached non-volatile components. Being forced to do troublesome and troublesome work. Other conventional devices include scraper vane falling film evaporators in which the liquid material flows down a heat transfer surface having mechanical scraper vanes inside a jacketed body. According to this conventional device, the reduction in heat transfer efficiency on the heat transfer surface can be prevented to some extent by using mechanical scraping blades, but once a strong non-volatile component adheres to the heat transfer surface, there is no way to remove it, and the viscosity increases. In the case of certain non-volatile components, there are drawbacks such as adhesion to and growth of the scraping blade, and in addition, precision is required for manufacturing this conventional device itself, and stirring power for the scraping blade is also required.
Furthermore, other conventional devices include a fluidized bed drying incinerator that fills the interior with solid particles, fluidizes the solid particles by blowing hot air from the bottom, and injects a liquid substance into the solid particles for combustion. There is. However, in this conventional device, since the entire amount is combusted, the volatile components cannot be recovered, and the device itself becomes enormous, making it extremely uneconomical. Yet another conventional device is a device that heats a rotary furnace with stirring blades inside with a gas burner from the outside, and concentrates and dries the liquid material supplied into the rotary furnace together with solid particles while flowing down under its own weight. (Tokuko Showa 48-4309
issue). In the case of this conventional device, heat is conducted from the inner wall surface of the rotary furnace to the liquid substance via solid particles.
Although the efficiency of concentrating and drying liquid substances is better than that of the ordinary indirect heating type rotary kiln method, which does not have solid particles, mutual contact between the inner wall surface of the rotary furnace, solid particles, and liquid substances is due to the stirring blades. , the mutual contact is still insufficient,
The efficiency of concentrating and drying liquid substances does not improve that much, and perhaps to compensate for this, even if the disadvantages of the equipment configuration are tolerated, a powerful heating source such as a gas burner is required, and the mechanical scraping mentioned above is necessary. As with the case of the handle blade, once a strong non-volatile component adheres to the inner wall surface of the rotary furnace, it becomes impossible to handle it.

The present invention solves the drawbacks of the conventional devices mentioned above and provides an improved device for concentrating and drying liquid substances that meets the above requirements. The entire amount of volatile components is recovered by concentrating and drying non-volatile components while evaporating volatile components such as organic solvents using heated solid particles that are vigorously stirred or mixed by an external vibration source. In addition, the non-volatile components are in a solid form that is easy to handle, and maintenance throughout the entire process is easy and economical.

Hereinafter, the configuration of the present invention will be explained in detail based on the drawings.

FIG. 1 is a side view including a partial cross section showing one embodiment of the present invention, and FIG. 2 is an enlarged schematic cross-sectional view illustrating its operating state. A closed system hollow container 1 having a substantially cylindrical shape and having a jacket 2 on the outer periphery in which a heat medium can be circulated is equipped with one to several vibration generating sources 5 firmly fixed, and a spring 14 is attached to a base 3. , 24, 34, 44 (however, 34 is not shown), the movement of the vibration source 5 provides a certain kind of free movement. Inside the closed hollow container 1, there are a large number of solid particles 6 sized within a certain range.
It is filled to ~75% by volume, and there is an exhaust port 7 on the top side.
and four liquid dispersers 19 each having a supply port 8 and connected to the supply port 8 via a supply pipe 9,
29, 39, and 49 are positioned inside the closed hollow container 1.

In the case of this embodiment, the closed hollow container 1 has a horizontal cylindrical shape, but it may also have a rigid cylindrical shape or a conical shape thereof. In addition, in the case of this embodiment, the so-called shower type liquid dispersers 19, 29, 39,
49 are used, but this type of liquid dispersing device is not limited to this type, and depending on the properties and amount of the liquid material to be treated, the liquid material may be continuously or intermittently dispersed. For example, it may be supplied by a spraying method, a pump pressure feeding method, or a dripping method, and the number of attached devices may be one to several. In this example, silica sand sized to about 7 to 20 meshes was used as the solid particles filled inside the closed hollow container 1, but ceramic particles and metal particles with good thermal conductivity were also used. etc. may be used. In either case, it is necessary to have a structure in which the liquid material is dispersed as uniformly as possible on the surfaces of a large number of relatively small-sized solid particles.

Next, the detailed operation of the present invention will be explained based on FIG. 2. When the vibration generating source 5 is driven to apply approximately circular vibration to the closed system hollow container 1, the large number of solid particles 6 filled inside vibrates and rotates in a similar approximately circular manner as shown by arrow A in the figure. Meanwhile, a stirring or mixing state occurs in which the particles repeatedly collide violently. On the other hand, when the wall surface of the closed system hollow container 1 is heated by circulating steam or a commercially available liquid heat medium through the jacket 2, the solid particles 6 are heated.
is heated to approximately the same temperature as these heating media. Heat conduction, which is the main source of heating at this time, is extremely efficient because the solid particles 6 repeatedly collide violently while vibrating and rotating. In this state, when the liquid substance is dispersed and injected from the liquid disperser 29 through the supply port 8, the liquid substance comes into contact with the surface of the solid particles 6, and the volatile components in the liquid substance evaporate almost instantly. It is distilled off from the exhaust port 7. At this time, the non-volatile components in the remaining liquid substance adhere to the surface of the solid particles 6, but since the solid particles 6 repeatedly collide violently with each other, the non-volatile components are removed from the solid particles 6 and dispersed. It becomes a fine solid substance while being crushed. Therefore, the solid particles 6 are constantly repeating self-cleaning. Due to the working characteristics of the present invention, for example, when waste thinner used for paint cleaning is treated by using steam at about 150°C as a heat medium and filling it with silica sand sized to 7 to 20 mesh, it is possible to seal it tightly. Even when the amount of fine solid particles produced in the hollow container of the system becomes equal to the amount of silica sand, the processing performance does not deteriorate.

FIG. 3 is a schematic diagram illustrating a series of processing systems incorporating the liquid substance concentration and drying apparatus according to the present invention. When a liquid substance is dispersed and injected in the direction of arrow B into a closed system hollow container 1 in which a heating medium is circulated in advance and filled with a large number of solid particles, the volatile components in the liquid substance evaporate, and the liquid substance is evaporated as indicated by arrow C. Accordingly, it reaches the condenser 10, where it is condensed, recovered, and effectively reused as appropriate. On the other hand, since the non-volatile components in the liquid substance accumulate as fine solid particles as described above, they are intermittently taken out together with the solid particles and reach the shifter 20, where the solid particles and fine solid substances are combined. After separation, the solid particles are returned to the closed hollow container 1 for reuse, if necessary via incineration means. Due to its nature, the fine solid particles thus obtained are easy to handle and can be used for other purposes, and may be ultimately disposed of by landfilling, incineration, or the like.

In the schematic diagram illustrated in FIG. 3, the device according to the present invention is of a so-called batch type.
While continuously dispersing and injecting the liquid substance, solid particles and the generated fine solids are continuously taken out little by little and are continuously separated using a sifter.
It is also possible to adopt a continuous system in which the separated solid particles are continuously returned.

As explained above, the present invention recovers the entire amount of volatile components while converting non-volatile components into a solid form that is extremely easy to handle when treating organic solvent-based liquid substances containing various organic and inorganic substances. In addition, there is an effect that the processing itself can be carried out economically with easy maintenance and management.

[Brief explanation of the drawing]

Fig. 1 is a side view including a partially sectional state showing one embodiment of the present invention, Fig. 2 is an enlarged schematic cross-sectional view illustrating its working state, and Fig. 3 is a side view including a partially sectional state showing an embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a series of processing systems. DESCRIPTION OF SYMBOLS 1... Sealed hollow container, 2... Jacket, 3... Base, 14, 24, 44... Spring, 5... Vibration source, 6... Solid particle, 7... Exhaust port, 8... Supply port,
19, 29, 39, 49...liquid disperser, 10...condenser, 20...sifter.

Claims (1)

[Claims] 1. One piece connected from the supply port to the inside of a closed system hollow container in which a supply port, an exhaust port, etc. are appropriately perforated.
A large number of liquid dispersers are positioned, and the hollow container is filled with 10 to 75% by volume of a large number of solid particles sized within a certain range, and the hollow container having a jacket is made of an elastic body such as a spring. The hollow container is vibrated by an external vibration source, and the solid particles are heated by circulating a heating medium through the jacket while being heated by vigorously stirring or mixing the solid particles. A device for concentrating and drying a liquid substance, wherein the liquid substance dispersed and injected from the liquid disperser through the port is heated, volatile components are evaporated from the exhaust port, and non-volatile components are concentrated and dried.