JPS6148962B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an evaporator for solvent recovery.

A wide variety of solvents such as hydrocarbons, alcohols, and ketones are widely used for paints, printing, cleaning, oil extraction, and the like. Collecting these used waste solvents is beneficial for reducing product prices and saving resources.
A safe solvent recovery device is desired. However,
Conventional solvent recovery equipment is formed by integrally combining an evaporator and a heating source device, and although it is less dangerous when recovering flame-retardant or non-combustible solvents, it is dangerous when recovering flammable solvents. Since the evaporator containing the waste solvent is located close to a heating source that generates heat at a high temperature, there is a high risk of ignition and explosion if the evaporator or heating source were to be damaged.

The present invention has been made in view of the above-mentioned points, and it is possible to separate the heating source device from the evaporator to minimize the danger even when recovering flammable solvents, and to separate the evaporator and the heating source device. Nevertheless, the object of the present invention is to provide an evaporation device for solvent recovery that has high heat transfer efficiency.

The present invention will be explained below based on examples.

FIG. 1 shows an embodiment of the present invention, in which an evaporator 1 for storing and evaporating waste solvent and a heating source device 2 for heating the waste solvent contained in the evaporator 1 are separated by a predetermined distance. installed and connected with a long heat pipe 3. The evaporator 1 is formed into a box shape with an evaporator main body 4 and a lid 5, each having a heat insulating structure on the outer periphery. In the internal space 8 formed by the inner peripheral walls 6 and 7 of the evaporator 1, a general-purpose solvent container 9 such as an 18 can commonly used for storing waste solvent can be accommodated in close contact with the inner peripheral wall 6. I have to. As shown in the figure, the inner peripheral wall 6 of the evaporator body 4 has a cylindrical heat pipe inner wall 10 and a heat pipe outer wall 11 made of predetermined materials and a bottomed double cylindrical heat pipe structure with a pressure-resistant structure. A working fluid 13 of a high boiling point organic material such as water or dowsum is sealed in a steam space 12 which is a small gap between the inner wall 10 of the pipe and the outer wall 11 of the heat pipe to the extent that a heat pipe (not shown) is immersed therein. . As the working fluid 13, use an appropriate one that corresponds to the evaporation temperature of the solvent to be recovered, and use it in the vapor space 12.
It is preferable to encapsulate it under reduced pressure. A cylindrical body 14 having a heat pipe structure is integrally formed on the side surface of the lower part of the inner circumferential wall 6 so as to communicate with the inner circumferential wall 6.
is extended to the side circumference of the evaporator main body 4, and a connecting part 15 such as a fitting recess is provided at the end so that one end of the heat pipe 3 of a predetermined length can be detachably inserted. ing. 16 is a band-shaped fixture for preventing the heat pipe from coming off. A lid 5 is hinged to the top surface of the evaporator body 4 so that it can be opened and closed freely, and a solvent container 9 is attached to the lid 5.
can be put in and taken out freely. 17 is the evaporator main body 4
and the lid body 5, 18 is a solvent outflow pipe for connecting to a condensing device (not shown), 1
Reference numeral 9 denotes a connector that is detachably connected to the can opening 20 of the solvent container 9, 21 is a connector pressing spring, 22 is a pressure adjustment device for the internal space 8, 23 is a handle for the lid body, and 24 is a handle for the solvent container. be.

On the other hand, the heating source device 2 is formed into a box shape as shown in the figure, and is a cylinder made of a ferromagnetic material such as carbon steel or 18 chromium steel with an appropriate cross-sectional structure on the outside and an open side surface in the center. A heating section 25 having a shape of
An induction coil 27 is disposed around the outer periphery of the coil 5 in a cylindrical shape via a cylindrical heat insulating material 26 made of a non-magnetic material such as a heat-resistant tempered glass plate or a ceramic plate. and,
The heating source device 2 has a predetermined ground connection, a predetermined high frequency oscillator (not shown) is connected to the induction coil 27 to be able to operate electromagnetically, and the other end of the heat pipe 3 is inserted into the heating section 25. parts can be heated by induction. 28 is a band-shaped fixing device for preventing the heat pipe from coming off. Furthermore, a temperature sensor 29 is attached to the end of the heating section 25, and the heat pipe 3
The heating temperature of the induction coil 27 is controlled by detecting the temperature to be heated, and the temperature is maintained at a predetermined temperature based on the above-mentioned temperature sensor 29 for a predetermined period of time via a timer or the like of a control device (not shown). The waste solvent in the evaporator 1 can be heated.

Further, the heat pipe 3 is made of stainless steel, copper pipe, etc. and can transmit a predetermined heat capacity.
The length is such that the evaporator 1 and the heating source device 2 can be installed at a predetermined distance by connecting one or an appropriate number of them, and can be attached and detached to the connection part 15 of the evaporator 1 and the heating part 25 of the heating source device 2, respectively. It is designed to be inserted freely and closely. Then, the amount of heat generated by induction heating in the heating section 25 is quickly and highly efficiently transferred to the inner circumferential wall 6 of the heat pipe structure via the connecting section 15,
The solvent container 9 is heated by a heat pipe so that the waste solvent loaded in the solvent container 9 can be recovered. The intermediate transmission part of the heat pipe 3 is covered with a suitable heat insulating cover 30 and can be made into a flexible structure that can be bent to facilitate connection if necessary.

As mentioned above, the evaporator is not equipped with any equipment that could cause the solvent to catch fire or explode, such as a heating source device, so it is safe even when handling flammable solvents that have a high risk of catching fire or explosion. is extremely high. In addition, since the heat source device can be installed at a predetermined distance from the evaporator using a heat pipe, even when using flammable solvents, the heat source device does not have to have an explosion-proof structure, which is particularly complicated and expensive. Even if the evaporator or heating source device is damaged, the flammable solvent will reach its explosive limit and there is very little risk of an explosion. It is. Also,
Since the evaporator and the heating source device are connected by a heat pipe, which are separated by a predetermined distance, the amount of heat can be transferred with high efficiency, and the heat transfer is equivalent to that of an integral combination of the evaporator and the heating source device. It is effective. Furthermore, in this embodiment, since the evaporator has a heat pipe structure, the solvent container can be evaporated and heated uniformly and thermally efficiently.

FIG. 2 shows another embodiment of the present invention, in which an evaporator 1 is mounted on a heating source device 2 and connected with a short heat pipe 3.

In this embodiment as well, the evaporator and the heat source device can be completely partitioned, so even if the heat source device is the same as the conventional one, the safety can be improved compared to the conventional one.

In addition, if the heat pipe is detachably connected to the evaporator and the heat source device as described above, the evaporator and the heat source device can be shared, and just by replacing the heat pipe, the first They can be installed at a predetermined distance as shown in the figure, or they can be easily integrated into a conventional form as shown in FIG.

Furthermore, since the evaporator and the heat source device can be appropriately connected using the heat pipe as described above, quality inspection and replacement in the event of failure are easy, and model changes can be easily performed.

In the above embodiment, the inner circumferential wall of the evaporator has a heat pipe structure with a bottomed double cylinder shape, but it is also possible to have a heat pipe structure in which only the bottom part is a flat plate, or the evaporator has a heat pipe structure. It doesn't have to be from .

In addition, although we have described an evaporator that accommodates a general-purpose 18-can solvent container, it can also be applied to a 20-can or drum can.
Further, the waste solvent may be directly stored in the evaporator without passing through the solvent container.

Further, the heat source device is not limited to power induction heating, and may be high frequency induction heating, electric heating, or the like.

Further, in the above embodiment, the evaporator and the heat source device are connected by one heat pipe, but a plurality of heat pipes having a predetermined heat transfer capacity may be arranged in parallel. It is something.

In addition, if a cooling fan is installed in the heating source device and the cooling fan is used for induction heating during solvent recovery,
The radiant heat from the heating source device is discharged to the outside to cool the induction coil, etc., and after the solvent recovery is completed, outside air is automatically sucked in for a predetermined period of time to cool the internal space of the evaporator. in,
It is also possible to forcibly cool the end of the heat pipe. In this way, the inside of the evaporator after solvent recovery can be cooled using the heat pipe that heats the evaporator, which shortens the cooling time and increases the operating rate of the solvent recovery device. .

As described above, in the present invention, since the evaporator and the heat source device are separated, even if the evaporator or the heat source device is damaged, the flammable solvent will reach its explosive limit and ignite and cause an explosion. This greatly reduces the risk of injury and improves safety. Also,
Even though the evaporator and heating source device are separated, they are connected through a heat pipe for heat transfer.
The solvent can be recovered with the same heat transfer efficiency as when the evaporator and heating source device are integrated.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted vertical sectional view of one embodiment of the present invention, and FIG. 2 is a partially omitted side view of another embodiment of the invention. 1... Evaporator, 2... Heat source device, 3... Heat pipe.

Claims (1)

[Claims] 1. An evaporator for storing and evaporating waste solvent and a heat source device for heating the waste solvent stored in the evaporator are separated, and the separated evaporator and heat source device are combined. An evaporation device for solvent recovery, characterized in that the device is connected to enable heat transfer using a heat pipe having a predetermined heat transfer capacity. 2. The evaporator for solvent recovery according to claim 1, wherein the heat pipe has a predetermined length so that the evaporator and the heat source device can be installed at a predetermined distance. 3. The evaporator for solvent recovery according to claim 1 or 2, wherein the heat pipe is detachably connected to the evaporator and the heat source device, respectively. 4. The evaporator for solvent recovery according to any one of claims 1 to 3, wherein the evaporator is formed in a heat pipe structure so as to evaporate and heat the waste solvent.