JPS5861793A - Distillation apparatus of dry cleaning machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a distillation apparatus for a dry cleaning machine using organic solvents such as perchloroethylene, 1.1.1 trichloroethane, R11,3, etc.

This type of dry cleaning machine dry-cleans clothing A, etc. in the following steps. The outline of this process is explained in the first part.
This will be explained based on the diagram. Put clothes A into the dry cleaning machine through door 1 = 1 - Close door 1 and start operation. At the start of operation, pump up the solvent 3 in the solvent tank 2 with the bomb f5 through the valve 4,
The treatment 'NIFJ/ is injected through valve 6 and filter 7 or through valve 8. Next, the washing drum 10
Slowly turn the solvent 3 to the treatment tank 9, ? tongue wrap 1
Clothes A are washed by circulating through a circuit consisting of valve 12, pump 5, valve 6, filter 7, or valve 8. After further cleaning, the waste liquid is led to the distiller 14 via the treatment tank 9, the butane trap 1, the valve 12, the pump 5, and the valve 13. Subsequently, the washing drum 10 is rotated at high speed to centrifugally separate the solvent 3 in the clothing A and lead it to the distiller 14.

After this draining, the above-mentioned cleaning is repeated again, and then the processing tank 9,
The liquid is drained into the solvent tank 2 through the path of the button trap 11, valve 12, and valve 4, and then the washing drum 10 is rotated at high speed to centrifugally separate the solvent 3 in the clothing A and drained.

After the washing process and draining process are completed, the washing drum 3 is slowly rotated again and the air is passed between the processing tank 9 and the linear duct 18 consisting of the fan 9-15, air cooler 16, and air heater 17 by arrow B. Clothes A are dried by circulating them in the following directions.

The solvent gas evaporated from the clothing A is condensed in the air cooler 16, enters the water separator 20 through the recovery path 19, and enters the Tallinn tank 22 through the solvent pipe 21. The water separated by the water separator 20 is discharged to the outside of the system through a water pipe 23.

Furthermore, after the drying process is completed, the damper A'24.25 opens like a wire, sucks in fresh air from the damper 24, and exhausts uncondensed solvent gas that cannot be recovered by the air cooler 16 from the damper 25, eliminating the solvent odor in the clothing A. Deodorize.

The solvent waste liquid 26 generated in the liquid draining step is sent to the distiller 14 via a valve 27 by a pump (not shown), as shown in an enlarged view in FIG. This distiller 14 forms a heating chamber 28 at the bottom, and heats the solvent waste liquid 26 by flowing saturated steam (pressure 4-5 to 9/cm2G) through a valve 29. Evaporate.

The water enters the condenser 32, is condensed by the water cooling coil 33, and is recovered by the recovery pipe 34.

Then, it enters the clean tank 22 through the water separator 20 and solvent pipe 2 shown in FIG.
Then return to solvent tank 2.

In addition, 338 in FIG. 2 is the cooling water inlet of the cooling water coil 33,
33b is the same exit. 35 is a steam trap for discharging the drain from the heating chamber 28.

As described above, in the conventional distillation apparatus, the solvent waste liquid is heated and evaporated with water vapor, but all of the heat given to the solvent vapor is transferred to the cooling water side during condensation and is discharged outside the system. This poses a problem in terms of energy conservation.

For example, a small dry cleaning machine (- processing capacity 8 times)
kg), 60 tons of Zechlorethylene at room temperature
The approximate heat balance for the distiller and condenser when the distiller and condenser are charged, heated, evaporated, and completed is as follows. For cooling water, Q = 6880 kcal (however, the amount of cooling water is 5.17 to 1?/min, the cooling water inlet temperature is 18°C, and the cooling water outlet temperature is 37°C), and for water vapor, Q = 712.
0kca7 (however, water vapor flow rate 0.2 kg 1 minute),
Regarding the solvent, Q = 6770 kcm/(however, the amount of solvent evaporation is 1.4 ky1 min, the latent heat is 50 kcJl/kg, the specific heat is 0.21 keall/kg・c, and the initial temperature is 29
℃, the same discharge point is 121℃). Therefore, it is clear from this result that the heat of the steam input for solvent distillation is discharged from the cooling water outlet.

Here, it is possible to use the water temperature at the cooling water outlet, but in the case of perchlorethylene solvent, it is at most 40°C,
Effective use of this temperature is difficult.

In addition, in conventional distillation equipment, intermittent distillation called patch type distillation is common, and when distillation is complete, room temperature solvent flows into the distiller, which temporarily cools the inside of the distiller and stops distillation. . This method has the disadvantage of low distillation efficiency (distillation processing capacity per hour).

51 The present invention has been made in view of the above circumstances, and its purpose is to significantly save energy and increase efficiency by using solvent vapor for preheating the waste liquid. The purpose of the present invention is to obtain a distillation device for a dry cleaning machine that can be used in a dry cleaning machine.

That is, the present invention connects a tank for collecting solvent waste from a washing drum and a distiller for heating and evaporating the solvent waste through a conduit with a regulating valve, and connects the distiller to a condenser for solvent vapor. A distillation device for a dry cleaning machine in which solvent vapor evaporating from a distiller flows through and communicates with the latent heat through a heat transfer part that preheats the waste liquid in the tank or the waste liquid led from the tank to the distiller. be.

The present invention will be explained below with reference to the drawings.

FIG. 3 shows a distillation apparatus for a dry cleaning machine showing an embodiment of the present invention. This distillation apparatus is provided with a tank 41 for storing the solvent waste liquid 26 of the washing drum 10, a distiller 42 for heating and evaporating the waste liquid, and a condenser 43 for the evaporated solvent. Tank 6 = No. 4 is provided with a valve 44 at the top for adjusting the amount of inflow of waste liquid from the washing drum 10, and a heating coil 45 through which solvent vapor from the condenser 43 flows is disposed inside. This heating coil 45 is in contact with the waste liquid 26 in the tank 41, and corresponds to the heat transfer section of the present invention. Furthermore, a valve 4 is installed between the lower part of the tank 41 and the upper part of the distiller 42.
A conduit 47 with a pipe 46 attached thereto is connected to the pipe 47 to allow the solvent waste 26 in the tank 41 to flow into the distiller 42 by regulating the pulp 46. This distiller 42 is provided with a heating chamber 48 in the lower part into which steam flows, a pulp 49 is provided on the steam inflow side of the heating chamber 48, and a steam trap 50 is provided on the discharge side of the heating chamber 48. Further, a rising conduit 51 is attached to the upper part of the distiller 42 and connected to the inlet side of the heating coil 45. The condenser 43 is connected to the outlet side of the heating coil 45. This condenser 43 has a recovery pipe 52 attached to its lower part and a water cooling coil 53 disposed inside. In addition,
In the figure, 53a is the inlet of the water cooling coil, and 53b is the outlet thereof.

In this distillation apparatus, when the solvent waste liquid 26 in the tank 41 enters the distiller 42 through the conduit 47, the solvent waste liquid 26 is heated and evaporated by steam in the heating chamber 48. The solvent vapor 30 passes through the riser pipe 5, enters the heating coil 45, and enters the tank 41.
Preheat the solvent waste liquid 26 inside. The solvent vapor 30 subjected to preheating is partially condensed and liquefied, flows through the heating coil 45 together with the solvent vapor, and enters the condenser 43. The solvent condensed in the condenser 43 is returned to the solvent tank 2 in FIG. 1 in the same way as in the conventional system.

When the solvent drain 26 in the distiller 42 is empty, the valve 46
is opened and solvent waste 26 flows through conduit 47 into distiller 42 . Distillation starts again in 1 to 2 minutes. The tank 4I is still supplied with the solvent to be distilled next from a pump (not shown) via a valve 44.

According to this distillation apparatus, since the solvent waste liquid 26 in the tank 4 is preheated by the solvent vapor 30 flowing through the heating coil 45, the amount of heat required for heating in the distiller 42 can be reduced. Significant energy savings are possible.

For example, in the case of perchlorethylene (60 tI)), the solvent waste 26 in the tank 41 is heated from 29° C. to about 115° C., and the amount of heat Q received from the solvent vapor 3o during this time is 1755 kcal. This corresponds to 24.6% of the amount of heat required in the conventional case, and energy savings can be achieved by that amount.

Also, in this example, the intermittent distillation method is used as in the conventional method, but
Since the temperature of the waste liquid has already been raised to near its boiling point, the distillation stop time is shortened and distillation performance close to that of continuous distillation can be obtained.

FIG. 4 shows another embodiment of a distillation apparatus for a dry cleaning machine. In this distillation apparatus, the solvent vapor 30 from the distiller 42 comes into contact with the bottom plate 54 of the tank 41, which serves as the heat transfer section of the present invention. This distillation apparatus also has the same effects as the one shown in FIG.

FIG. 5 shows an example of a distillation apparatus capable of carrying out a continuous distillation method. In this distillation apparatus, a waste liquid heating chamber 55 is installed at an angle between a turn 41 and a distiller 42, and the bottom plate 56 of this chamber serves as a heat transfer part, and is heated by solvent vapor 30. . In addition, this distillation apparatus has a float type proximity switch 58 installed in a liquid level detection channel 57 that communicates with the distiller 42 to maintain the same liquid level, and inputs a signal from this proximity switch 58 to a control box 59. The opening and closing of the pulp 46 in the conduit 47 is controlled. Further, an introduction pipe 60 is attached to the tip of the waste liquid heating chamber 55 so that the solvent waste liquid 26 overflowing from the waste liquid heating chamber 55 can be smoothly dropped into the distiller 42 . Further, a guide plate 6 is attached to the upper part of the distiller 42 to guide the condensed solvent falling from the bottom plate 56 of the waste liquid heating chamber 55 to the condenser 43 side.

In this distillation apparatus, when the solvent drain 26 in the distiller 42 evaporates and the liquid level drops, the float-type proximity switch 58 turns on, and the pulp 46 opens via the control box 59, causing the solvent drain 26 to drop.
6 flows into the waste liquid heating chamber 10 - pump 55 , and the same amount of preheated waste liquid 26 overflows into the distiller 42 . This distiller 42
The drainage surface inside can be maintained at a nearly constant height. However, when the solvent waste liquid 26 in the tank 41 becomes empty, the solvent waste liquid 26 in the distiller 42 also becomes empty eventually. According to this distillation apparatus, since the solvent waste liquid 26 in the waste liquid heating chamber 56 is preheated with the solvent vapor 30, the temperature of the solvent waste liquid 26 overflowing from this chamber 56 into the distiller 42 is 1.
The temperature is close to 20℃.

Therefore, the overflowing solvent waste liquid 26 is transferred to the distiller 42.
There is no cooling of the solvent effluent 26 within. Also distiller 4
Since the amount of liquid drained from the heating chamber 48 is constant, the heating efficiency is high and the state in which the effective heating area of the heating chamber 48 can be used to the maximum can be maintained.

Therefore, according to this embodiment, the energy consumption can be reduced by 26% or more compared to the conventional method, and the distillation rate can be more than doubled.

Note that in the present invention, fins may be attached to the heat exchanger parts such as the heating coil and the bottom plate to increase efficiency. Further, the cleaning machine may be one in which the distillation apparatus according to the present invention and a conventional distillation apparatus as shown in FIG. 2 are installed together.

As explained above, according to the present invention, since the waste liquid is preheated with solvent vapor, energy can be saved during distillation, and the distillation rate can still be increased.

It has a remarkable effect.

[Brief Description of the Drawings] Fig. 1 is an overall schematic diagram of a cleaning machine, Fig. 2 is an explanatory diagram of a conventional distillation apparatus, Fig. 3 is an explanatory diagram of a distillation apparatus showing an embodiment of the present invention, and Fig. 4 is an explanatory diagram of a distillation apparatus showing an embodiment of the present invention. FIG. 5 is an explanatory diagram of a distillation apparatus showing other different embodiments of the present invention. 10... anti-layer drum, 26... solvent drainage, 30...
・Solvent vapor, 41...tank, 42... distiller, 4
3... Condenser, 44... Valve, 45... Heating coil, 46... Valve, 47... Conduit, 48...
heating chamber, 51... rising conduit, 54... bottom plate, 55...
...Drainage heating chamber, 56...Bottom plate, 57...Liquid level detection chamber/'1,5B...Float type proximity switch, 59...Control box. 13-

Claims (1)

[Claims] The tank that collects the solvent waste from the washing drum and the distiller that heats and evaporates the solvent waste are connected through a conduit with a regulating valve.
and the distiller and the solvent vapor condenser are connected through a heat transfer part through which the solvent vapor evaporated from the distiller flows and uses its latent heat to preheat the waste liquid in the tank or the waste liquid led from the tank to the distiller. Distillation equipment for dry cleaning machines.