JPS6216161Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an evaporation device 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. In recent years, solvent recovery devices have been developed that recover these used waste solvents by steam heating. Solvent recovery by steam heating is problematic for high boiling point solvents because the steam pressure increases rapidly at high temperatures, but it is relatively quick and flammable and explosive for low and medium boiling point solvents. It has the advantage of being able to recover the solvent without any problems. However, in conventional solvent recovery equipment using steam heating, the waste solvent is directly loaded into the steam pot and heated for evaporation, so it is troublesome to put in and take out the waste solvent, and the waste from the recovered solvent sticks to the bottom of the steam pot. Post-processing was not easy.

The present invention was developed in consideration of the above points, and uses steam heating to efficiently recover waste solvent in a short period of time and safely.
To provide an evaporator for solvent recovery in which a solvent container can be easily put in and taken out, solvent recovery work can be speeded up, and waste solvent can be easily processed.

The present invention will be explained below based on examples.

FIG. 1 shows an embodiment of the present invention, in which an evaporator 1 is formed into a box shape with a lid 2 that can be opened and closed. The outer peripheral parts of the evaporator 1 and the opening/closing lid 2 have a heat insulating structure, and the inside of the evaporator 1 has an inner peripheral wall 3 in the shape of a double cylinder with a bottom and having a predetermined pressure resistance. The inner circumferential wall 3 is configured so that a solvent container 4 such as an 18 can, which is commonly used for storing waste solvents, can be closely accommodated on the inner circumferential surface, and the waste solvent loaded into the solvent container 4 can be evaporated and heated. That's what I do. The inner circumferential wall 3 is formed into a bottomed double cylindrical shape as described above by the inner wall 5 and the outer wall 6, each having a cylindrical shape with a bottom, and the cylindrical space between the inner wall 5 and the outer wall 6. Steam of a predetermined temperature and pressure, such as factory steam, can be distributed to 7. The inner wall 5 is formed of a material as thin as possible to increase the heat transfer coefficient, and a sufficiently rigid thick material is formed along the outer peripheral surface of the inner wall 5 on the cylindrical space 7 side as shown in FIG. reinforcing materials 8 are arranged in the form of fins at predetermined intervals to prevent the inner wall 5 from expanding inwardly due to the pressure of steam as much as possible.
This allows for smooth loading and unloading. Also,
In the space below the inner circumferential wall 3, a steam introduction pipe 9 in the shape of a square as shown in FIG. 3 is arranged. A small diameter steam scattering hole 1 is provided on the upper surface of the steam introduction pipe 9.
A steam inlet pipe 1 has a large number of holes drilled at appropriate pitches, communicates with the steam inlet pipe 9, and protrudes to the outside.
Steam from a factory steam pipe or the like flows uniformly into the cylindrical space 7 from 1, and drains out to the outside from a steam trap 13 of a steam outlet pipe 12 connected to the bottom. The steam inlet pipe 11 is provided with an on-off valve 14 that is closed by a predetermined timer device (not shown), so that the evaporator 1 can be heated with steam for a predetermined time by the timer device. The opening/closing lid 2 is
The lower part has a recessed structure, and the upper surface of the evaporator 1 can be opened and closed using hinges and fasteners (both not shown), so that the solvent container 4 can be taken in and out of the evaporator 1. This opening/closing lid 2 is provided with a solvent outflow pipe 15 for connecting to a condensing device (not shown).
A can opening 16 of the solvent container 4 is provided at the end of the solvent outflow pipe 15.
A connecting tool 17 is disposed to be removably connected to the container, and when the opening/closing lid 2 is closed, the connecting tool 17 is airtightly connected to the can opening 16 of the solvent container 4, and when the opening/closing lid 2 is opened, the connection is removed. That's what I do. 18 is a connector pressing spring; 19 is a sealing material that makes the gap between the top surface of the evaporator 1 and the opening/closing lid 2 airtight; and 20 is an inside of the evaporator that keeps the heated air in the evaporator 1 below a predetermined pressure. A pressure regulator, 21 is a lid handle, 22 is a solvent container handle, 23 is a pressure reducing valve that adjusts the steam pressure to a predetermined pressure, 24 is a pressure gauge, and 25 is a connection between the inner peripheral wall 3 and the steam outflow pipe 12. Communication, safety valve 2
This is a safety circuit with 6 installed.

Then, the solvent container 4 loaded with a predetermined amount of waste solvent is housed in the evaporator 1, and the condensation equipment piping, factory steam piping, drain piping, etc. are connected as prescribed, and the pressure is reduced according to the properties of the waste solvent. When the valve 23 and the timer device are set and the on-off valve 14 is opened, steam at a predetermined temperature passes through the steam inflow pipe 11 and the steam introduction pipe 9 for a predetermined period of time, and is discharged from the steam scattering hole 10 into the cylindrical space 7. flows uniformly into the
The steam flowing into the cylindrical space 7 heats the solvent container 4 more quickly than the periphery through the reinforcing material 8 disposed in the shape of fins on the inner peripheral wall 3 or directly through the inner wall 5, and the solvent container 4 is charged. Heat the waste solvent to evaporate it. The evaporated solvent is removed from the can opening 16, the connector 17, and the solvent outlet pipe 15.
It is condensed in a condensing device and sequentially collected in a collection can (not shown). The steam that has heated the inner circumferential wall 3 and lost its latent heat is condensed and flows out from the steam trap 13 of the lower steam outlet pipe 12 through the drain pipe. In this way, since the waste solvent is collected through a solvent container such as an 18-can container via a connector, etc., it is possible to prevent the inside of the inner peripheral wall from being filled with evaporated solvent and becoming dirty.
This prevents the waste of waste solvent from accumulating and sticking to the bottom of the inner circumferential wall that is heated by steam. Also,
Even if a certain pressure of steam is applied to the cylindrical space of the inner peripheral wall, which has a double cylindrical structure, the inner wall hardly bulges inward because the inner wall is strongly reinforced with reinforcing material. , the solvent container is not compressed by the inner wall and can be easily removed from the evaporator after solvent collection;
A new solvent container can be accommodated to recover the solvent. In addition, since the steam flows into the inner circumferential wall through the steam introducing pipe that scatters the steam uniformly, a part of the inner wall is not locally heated and deformed.
Furthermore, the impact of steam injection can be alleviated, and the durability of the evaporator can be improved.

FIG. 4 shows another embodiment of the evaporator 1 of the present invention, in which the side circumferential portion of the outer wall 6A of the inner circumferential wall 3A is bent into an uneven shape at a predetermined pitch, and the outer side protrudes toward the inner wall 5A. The protruding material 27 of the wall 6A is firmly fixed to the inner wall 5A by welding or the like, so that the cylindrical space 7A has a discontinuous cylindrical shape.

In this embodiment, a part of the outer wall and the inner wall are fixed to each other to use the outer wall for reinforcing the inner wall, and to prevent the inner wall from bulging inward of the evaporator due to steam pressure. It is preventable.

In addition, as the solvent storage container, although the explanation has been made regarding the 18 cans commonly used for storing waste solvents, the present invention can be similarly applied to 20 cans, drum cans, etc., and substitutes for these general-purpose cans.

As described above, in the present invention, the waste solvent can be heated uniformly and with good heat transfer efficiency without local heating, and can be evaporated safely and quickly. can be easily taken out from the evaporator, a new solvent container can be smoothly installed and handled, and the solvent recovery time can be shortened. Furthermore, since the solvent container such as 18 cans into which waste solvent is loaded can be freely put in and taken out of the evaporator for solvent recovery, handling of waste solvent is not as troublesome as in the past, and moreover, the waste of the waste solvent is not deposited at the bottom of the evaporator. Since it does not accumulate and stick, there is no need for post-treatment as in conventional methods, and solvent recovery can be easily and cleanly performed.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted side sectional view of an embodiment of the present invention, Fig. 2 is a plan sectional view of the inner circumferential wall of the evaporator shown above, and Fig. 3 is a plan view of the steam introduction pipe section shown above.
FIG. 4 is a plan cross-sectional view of another embodiment of the inner circumferential wall of the evaporator same as above. 1... Evaporator, 3, 3A... Inner peripheral wall, 4... Solvent container, 5, 5A... Inner wall, 6, 6A... Outer wall, 7,
7A...Cylindrical space part.

Claims (1)

[Scope of utility model registration request] In an evaporator for solvent recovery in which a solvent container such as 18 cans for loading waste solvent is removably housed to recover the solvent, the inner circumferential wall of the evaporator has a double cylindrical structure. A cylindrical space between the inner wall and the outer wall is formed so that the waste solvent of the solvent container, which stores steam at a predetermined temperature in the evaporator, can freely flow through it so that it can be evaporated and heated. The cylindrical space side of the side periphery and bottom of the inner wall is formed so as to be in close contact with the outer circumferential surface of the container, and to prevent the inner wall from bulging inward of the evaporator due to steam pressure as much as possible. An evaporation device for solvent recovery, characterized in that a fin-like reinforcing material is provided in the evaporator.