JPS64964Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is an apparatus for distilling waste solvent to recover the solvent. This invention relates to a device that prevents solvent gas from flowing out of a condenser.

[Conventional technology]

In conventional solvent recovery equipment, a discharge pipe equipped with a discharge valve is installed vertically at the lower end of the condenser, and by opening and closing the discharge valve as appropriate, the recovered solvent in the condenser is discharged into an appropriate container. .

[Problems that this invention aims to solve]

In the above-mentioned device, if the discharge valve is operated incorrectly, unliquefied solvent gas will flow out after the liquefied liquid is discharged. As a result, the interior of the building was filled with a foul odor that was harmful and posed a fire risk.

[Means for solving problems]

In this invention, a discharge valve is provided at the lower end of the discharge pipe, an oil drain pipe is branched from the discharge pipe, and a rising part is provided in a part of the pipe to form a trap for the solvent gas. The above-mentioned problem is attempted to be solved by providing a baffle plate for restricting the flow of solvent gas into the discharge pipe.

[Effect]

In this invention, since a rising part is provided in a part of the oil drain pipe, a part of the recovered solvent always stays in the lower part, blocking the passage of solvent gas, and reducing the amount of recovered solvent that has increased in the condensing chamber. flows out from the oil drain pipe due to the difference in head pressure.

Even if the discharge valve is operated incorrectly and all the solvent in the condensation chamber flows out and becomes empty, the action of the baffle plate prevents a large amount of solvent gas from suddenly gushing out from the drain pipe.

〔Example〕

The drawing shows the case where the present invention is applied to the solvent recovery device disclosed in the drawing attached to the application for utility model registration (Utility Model Application No. 59-56711) filed earlier by the applicant. , A is an evaporator, and B is a condenser.

A heat-resistant heat insulating material 2 is provided on the inner periphery of the rectangular tube-shaped shell 1 in the evaporator A, and further, inside the heat insulating material 2, the upper end is lower than the upper end of the shell 1. An outer cylinder 3 in the shape of a square cylinder with a bottom is fitted inside.

The outer cylinder 3 has a capacity large enough to accommodate 18 regular-sized oil cans with a slight gap, and its upper end is set at approximately the same level as the upper end of the shell body 1. An inner cylinder 4 in the shape of a square cylinder with a bottom is inserted.

The open upper surface of the inner cylinder 4 is closed with an upper lid 5 so as to be openable and closable.

A blocking plate 3 facing inward and upward connected to the upper end of the outer cylinder 3
By fixing the inner end of a to the outer periphery of the middle part of the inner cylinder 4, a heat medium chamber 6 whose upper end is closed is formed between the outer cylinder 3 and the inner cylinder 4, and the lower part thereof is An electric heater 7 is provided that penetrates the shell 1, the heat insulating material 2, and the outer cylinder 3.

The upper part of the heat medium chamber 6 is connected with a cooling pipe 8 to the upper part of a heat medium storage tank 9 installed at a predetermined height on the side of the evaporator A.

10 is a heat dissipation fin provided in the cooling pipe 8;
1 is an exhaust port provided in the storage tank 9.

The lower ends of the heat medium chamber 6 and the storage tank 9 are connected to the connecting pipe 1
2, and the communicating pipe 12 includes:
A heat medium supply/discharge pipe 14 is connected through a valve 13, and the heat medium chamber 6 and storage tank 9 are filled with a predetermined amount of a high boiling point heat medium 15.

The upper part of the inner cylinder 4 of the evaporator A is connected to the bottomed cylindrical condensing cylinder 17 of the condenser B through a conduit 16, and the lower end thereof is funnel-shaped.

Note that 18 is a temperature sensor that measures the boiling point of the solvent to be distilled, and is connected to a control panel (not shown).

A cooling cylinder 19, which is longer than the condensing cylinder 17 and has a cylindrical shape with a bottom, is inserted coaxially with the condensing cylinder 17.

The space between the condensing cylinder 17 and the cooling cylinder 19 is closed at the upper end of the condensing cylinder 17, and there is a condensing chamber 20 between them.
is formed.

An annular baffle plate 21 is fixed near the lower end of the inner surface of the condensing cylinder 17, and a narrow gap 22 is formed between it and the cooling cylinder 19.

At the lower end of the condensing cylinder 17, there is a discharge pipe 23 and a discharge valve 2.
4 and a drain pipe 25 are vertically installed in this order.

The drain pipe 23 includes an oil drain pipe 26 and an oil drain valve 27.
The drain pipe 26 is connected to the drain pipe 26 and has a rising portion 26a formed therein.

28 is a new petroleum can containing the recovered solvent.

A condensing pipe 29 is provided at the center of the cooling cylinder 19, the upper end of which slightly protrudes from the upper end of the cooling cylinder 19, and the lower end communicating with the lower part of the condensing chamber 20.

A water supply pipe 31 equipped with a water supply valve 30 and a drain pipe 32 are connected to the upper end of the cooling cylinder 19.
hangs down to near the inner lower end of the cooling cylinder 19.

To recover the solvent using the above recovery device, the cooling cylinder 19 is filled with cold water 33, the top surface of the oil can 34 in which the waste solvent is stored is opened, and this is poured into the inner cylinder 4 of the evaporator A. , close the top lid 5, and energize the heater 7.

Then, the waste solvent in the oil can 34 is heated and vaporized, and passes through the conduit 16 to the condensing chamber 20 of the condenser B.
, most of it is liquefied by the cold water 33 in the cooling tube 19 and the cold air outside the condensing tube 17, and further, while passing through the condensing tube 29, it is cooled by the surrounding cold water 33. , completely liquefy.

The liquefied solvent is removed from the rising portion 26a of the oil drain pipe 26.
After filling the condensing chamber 20, a rising section 2 is placed at the bottom of the condensing chamber
6a, and thereafter, the increased amount flows out from the oil drain pipe 26 to the new oil can 28, and the solvent gas in the condensing chamber 20 does not pass through the oil drain pipe 26.

The water mixed in the waste solvent and distilled together is separated from the solvent in the lower part of the condensation chamber 20 due to the difference in specific gravity, so the discharge valve 24 is opened at any time to drain the water.

A small amount of the heat transfer medium 15 evaporated during the recovery operation and the malodorous gases produced by pyrolysis are cooled while passing through the cooling pipe 8, and the liquefied heat transfer medium 15 is dripped into the storage tank 9 and recovered, while the gases that cannot be liquefied are cooled down and released from the exhaust port 11.

In the recovery device described above, the pressures at the condensation chamber 20 and the outlet of the oil drain pipe 26 are both almost equal to atmospheric pressure, so the height difference between both ends of the rising portion 26a may be small.

Further, the diameter of the oil drain pipe 26 needs to be made slightly thicker so that the siphon phenomenon does not occur when the recovered solvent flows out.

Note that the present invention can also be applied to other types of solvent recovery devices.

[Brief explanation of the drawing]

The drawing is a central vertical sectional front view of a simple solvent recovery device to which the present invention is applied. A...Evaporator, B...Condenser, 1...Shell, 2...Insulating material, 3...Outer cylinder, 4...Inner cylinder, 5...Upper lid, 6...Heat medium chamber, 7...Electric heater, 8...Cooling pipe, 9... Heat medium storage tank, 10... Fin, 11... Exhaust port, 12... Communication pipe, 13... Valve, 14... Supply/discharge pipe, 15... Heat medium, 1
6... Conduit, 17... Condensing cylinder, 18... Temperature sensor,
19... Cooling cylinder, 20... Condensing chamber, 21... Baffle plate, 2
2... Slit, 23... Discharge pipe, 24... Discharge valve, 25...
Drain pipe, 26...Drain pipe, 26a...Rising part, 2
7...Oil drain valve, 28...New oil can, 29...Condensing pipe, 3
0... Water supply valve, 31... Water supply pipe, 32... Drain pipe, 33
...cold water, 34...oil cans.

Claims (1)

[Scope of utility model registration request] In an apparatus for heating and vaporizing waste solvent, the solvent gas is introduced into a condensing chamber between a condensing cylinder and a cooling cylinder filled with cold water inside the condensing cylinder, and is condensed and recovered.
A baffle plate is fitted into the inner lower part of the condensing cylinder with a narrow gap provided between it and the cooling cylinder, and a discharge pipe and a discharge valve are provided at the lower end of the condensing cylinder, and the discharge pipe is provided with a rising part. A recovery solvent discharge device for a solvent recovery device that is connected to an oil drain pipe.