JPH0568846A - Condenser for halon-based solvent vapor - Google Patents

Abstract

PURPOSE:To efficiently condense the halon-based component in a halon-based solvent vapor current. CONSTITUTION:This condenser is provided with a rotary pump 7 for exhausting the vapor contg. a halon-based solvent, a pipe 1 connected to the pump 7 and through which the vapor current is passed to condense the halon component and to separate the halon component from the other components, plural control valves 5a,...5c connected to the pipe 1 and used for adjusting the pressure in the pipe and the direction of the gas and liq. currents, a tank 4 for cooling the pipe 1 and a cooling trap 10 connected to the discharge port 9a of the pipe 1 and used for trapping the condensed halon component. The inside of the pipe 9 is pressurized utilizing the delivery pressure of the pump 7, and the pipe 9 is cooled by and through the tank 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condensing device for halon components in a halon solvent vapor, and more particularly to a halon component capable of efficiently condensing and recovering halon components from a vapor stream containing a halon solvent. The present invention relates to a solvent vapor condenser.

[0002]

2. Description of the Related Art Halon solvents such as trichloroethylene, tetrachloroethylene, chloroform and carbon tetrachloride are
It is widely used as a cleaning agent for electric and mechanical parts, a cleaning agent for dry cleaning, and a solvent for organic substances. Carcinogenicity and liver damage have been observed in these substances in animal experiments, and environmental pollution such as air and water quality due to the use of halon-based solvents has become a social problem. From these facts, it is desired to collect and reuse the exhaust gas generated by using the halon-based solvent and the halon component in the waste liquid.

As a method of recovering a halon component in a gas such as a vapor flow generated by heating a halon-based solvent or an exhaust gas, pressurization for liquefying the halon component by cooling the gas while pressurizing the gas in a condenser. A cooling / condensation method, an adsorption method of adsorbing on a porous adsorbent, an absorption method of adsorbing on a high boiling point solvent, etc. have been put into practical use. In particular, the pressure / cooling condensation method is widely used as a method for recovering highly volatile solvents and refrigerants such as various halons and freons.

[0004]

However, since the existing condenser used in the above method is a cooling system in which a cooling coil or the like for conducting a refrigerant gas is installed in the condenser tank, a halon or freon component is used. The heat exchange efficiency when condensing is easily dependent on the surface area of the cooling coil,
If the amount of exhaust gas containing halon or freon components is large or the amount of these components is low, it is necessary to upsize the condenser device as a whole. As a result, a large installation area is required for the device, and the production cost and operating cost of the device become high. Further, when the amount of water in the gas containing halon or freon components is large, the water easily freezes on the surface of the cooling coil or the like, and the condensation efficiency is significantly deteriorated.

The present invention has been made in view of the above-mentioned points, and is a halon system for efficiently condensing and recovering halon components in a halon-based solvent vapor stream introduced into a condenser pipe under pressure / cooling. It is an object of the present invention to provide a condenser for solvent vapor.

[0006]

To this end, a condensing device for halon-based solvent vapor according to the present invention comprises a rotary pump for exhausting vapor containing a halon-based solvent and a rotary pump connected to the rotary pump to conduct the vapor flow. A condensing pipe for condensing the halon component to separate it from other gas components, a plurality of adjusting valves connected to the condensing pipe for adjusting the pressure in the condensing pipe and the direction of the air flow and the liquid flow, and cooling the condensing pipe. And a cooling trap for trapping condensed Halon components by connecting to a discharge port of the condensing pipe, and pressurizing the inside of the condensing pipe by using the discharge pressure of the rotary pump. It is characterized in that the halon component in the vapor stream containing the halon solvent introduced into the condenser by cooling through the cooling tank is pressurized and cooled to be condensed and recovered.

[0007]

In the halon-based solvent vapor condensing device of the present invention, the discharge pressure of the vacuum pump is used to pressurize the inside of the condensing pipe and cool it through the cooling tank. The halon component has a larger specific gravity than gas components such as air, and the physical properties that make it easy to liquefy under pressure / cooling are used to add the halon component in the halon-based solvent vapor flow introduced into the condensing pipe. It can be efficiently condensed and recovered under pressure / cooling.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side sectional view showing an embodiment of a condensing device for halon-based solvent vapor according to the present invention, and FIG. 2 shows the condensing pipe 1 when the metallic cylindrical pipes 2 are arranged in parallel in five rows. It is the figure seen, 1 is a condensing pipe, 2 is a metal cylindrical pipe, 3a-
3 g is a metal connecting pipe, 4 is a cooling tank, 5a to 5c are adjusting valves, 6 is a drain valve, 7 is a rotary pump, 8 is a buffer tank, 9a is an outlet, 9b is an outlet, 10 is a cooling trap, 11 Indicates a drain port, and 12 indicates a source of halon-based solvent vapor.

In FIG. 1, a condensing pipe 1 is arranged in a cooling tank 4, and a plurality of metal cylindrical pipes 2 having a large heat exchange area and excellent pressure resistance are connected in series by using metal connecting pipes 3a to 3g. It is an array of pipes. In this condensing pipe 1, the halon-based solvent vapor generated from the source 12 is introduced into the metal cylindrical pipe 2 in the preceding stage through the metal connecting pipe 3a, and the upper metal connecting pipe 3b and the lower metal connecting pipe 3c are connected. A plurality of metallic cylindrical tubes 2 are connected in series so as to be alternately arranged and meandered, and a metallic connecting tube 3d is connected to the lower end of each metallic cylindrical tube 2 to be commonly connected by a metallic connecting tube 3e. is doing. Then, the condensate of the halon component is collected from the metal connecting pipe 3e at the lower end, and the metal connecting pipe 3f is connected to the upper part of the final stage metal cylindrical pipe 2 so that the gas from which the halon component is removed is discharged. Is configured.

The cooling tank 4 is supplied with the liquid stream cooled to 5 ° C. to −40 ° C., and cools the halon-based solvent vapor introduced into the condenser pipe 1 to condense and separate the halon components. .. Metal connecting pipe 3 which is the air supply port of the condensing pipe 1.
A rotary pump 7 such as an oilless vacuum pump is connected to a via a buffer tank 8 for buffering pressure. In the metal connecting pipes 3f and 3e at the outlet of the condensing pipe 1,
The adjustment valves 5a to 5c and the drain valve 6 are connected to each other, and the discharge port 9a is connected to a cooling trap 10 for trapping the condensate. The exhaust port 9b is an exhaust port for gas such as air, and the drain port 11 is an exhaust port for water. The generation source 12 is a generation source of halon-based solvent vapor such as a cleaning device for electric / mechanical parts and a dry cleaning device.

Next, the operation will be described. In the configuration as described above, the halon-based solvent vapor generated by the generation source 12 is sucked by the rotary pump 7 and introduced into the condensing pipe 1 via the buffer tank 8. In the condensing tube 1,
The adjusting valves 5a to 5c are adjusted to pressurize the vapor flow by the discharge pressure of the rotary pump 7, and the Halon component in the vapor flow is condensed by cooling through the cooling tank 4 to a gas component such as air. And separate.

The condensate of the halon component condensed in the condensing pipe 1 is supplied from the metal connecting pipes 3d and 3e to the adjusting valve 5.
It is guided to the cooling trap 10 from the discharge port 9a through a and is recovered as a liquid. Most of the gas components such as air are discharged into the atmosphere from the outlet 9b of the condenser pipe 1.
At this time, the adjusting valve 5b of the condensing pipe 1 is closed and 5a and 5c are closed.
By adjusting and opening, the gas components such as air
It can also be discharged from the discharge port 9a into the atmosphere through the cooling trap 10. Further, the water contained in the halon-based solvent vapor can be frozen on the inner wall of the condensing pipe 1 by adjusting the pressure and temperature in the condensing pipe 1, and can be liquid in the cooling trap 10 together with the condensate of the halon component. Can also be trapped as

As described above, when water is frozen on the inner wall of the condensing tube 1, the water is discharged as a liquid from the drain port 11 of the condensing tube 1 by heating the inside of the condensing tube 1 at appropriate times. ..

The present invention is not limited to the above embodiment, but various modifications can be made. For example, in the above embodiment, when the metal cylindrical pipes 2 are arranged in series by using the metal connecting pipes 3b and 3c, the middle of the upper end and the lower end of the metal cylindrical pipe 2 is used as the connecting portion. The upper end and the lower end may be used as the connecting portion. Further, although the metal cylindrical pipe and the metal connecting pipe are used, it goes without saying that a cylindrical pipe made of synthetic resin or a new material instead of metal may be used. further,
Although the condensing pipes 1 are arranged and arranged in one line between the inlet part and the outlet part, they may be arranged in plural lines and arranged. FIG. 2 is a view of the condensing pipe 1 viewed from above when the metallic cylindrical pipes 2 are arranged in parallel in five rows. By arranging the condensing pipe 1 by combining the metallic cylindrical pipe 2 and the metallic connecting pipes 3a to 3g as illustrated, the condensing pipe 1 can be modified in various sizes and shapes. The condensing capacity of the condenser tube can be increased according to the required processing capacity of the solvent vapor.

[0016]

As described above in detail, according to the present invention, a vaporizing flow containing a halon-based solvent is conducted to the condensing pipe by a condensing pipe in which metal cylindrical pipes are arranged, and the volatility is increased by pressurizing and cooling. It is possible to efficiently condense a halon component having a high specific gravity and to separate and collect it from other gas components.
Moreover, compared to existing pressure / cooling type condensers,
Since a condensing pipe in which metal cylindrical pipes are arranged is used, the heat exchange surface area can be wide, it is easy to pressurize and cool, it is compact and has excellent pressure resistance, and the halon-based solvent has good condensation efficiency. A vapor condensing device can be made. In addition, the water contained in the halon-based solvent vapor can be frozen on the inner wall of a condenser tube with a large surface area by adjusting the pressure and cooling temperature in the condenser tube, or trapped as a liquid together with the condensate of the halon component. You can also Therefore, it is possible to reduce a decrease in heat exchange efficiency due to freezing of water as compared with the existing pressure / cooling type condenser. Furthermore, since the condensing pipe used in the present invention has a structure in which a metal cylindrical pipe and a metal connecting pipe are combined, many changes can be made in the size of the condensing pipe, the arrangement method, and the like. Therefore, it is possible to manufacture a compact and efficient condensing device according to the required processing capacity of the halon-based solvent vapor.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a condensing device for halon-based solvent vapor according to the present invention.

FIG. 2 is a view of the condensing pipe 1 when the metallic cylindrical pipes 2 are arranged in parallel in five rows as viewed from above.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Condensing pipe, 2 ... Metal cylindrical pipe, 3a-3g ... Metal connecting pipe, 4 ... Cooling tank, 5a-5c ... Regulator valve, 6 ... Drain valve, 7 ... Rotary pump, 8 ... Buffer tank, 9
a ... outlet, 9b ... outlet, 10 ... cooling trap, 11
… Drain port, 12… Source of Halon-based solvent vapor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsutoshi Kamei 4-37-6 Kamigaga, Setagaya-ku, Tokyo Inside the Race Horse Institute of Physical and Chemical Research (72) Inventor Atsushi Takumoto 4-37 Kamigaga, Setagaya-ku, Tokyo No. 6 Incorporated Race Horse Institute of Physical and Chemical Research (72) Inventor Haruo Tanaka 4-37-6 Kamigaga, Setagaya-ku, Tokyo Inside Incorporated Horse Institute of Physical and Chemical Research

Claims (2)

[Claims] 1. A rotary pump for exhausting vapor containing a halon-based solvent, and a condensing pipe connected to the rotary pump for conducting the vapor flow to condense a halon component and separate it from other gas components. A plurality of adjusting valves connected to the condensing pipe for adjusting the pressure in the condensing pipe and the direction of the air flow and the liquid flow; a cooling tank for cooling the condensing pipe; and a discharge port of the condensing pipe. A cooling trap for trapping the condensed halon component was provided, and the discharge pressure of the rotary pump was used to pressurize the inside of the condensing pipe and cool it through the cooling tank so that it was conducted into the condensing pipe. A condensing device for a halon-based solvent vapor, which collects a halon component in a vapor stream containing a halon-based solvent by pressurizing, cooling, condensing, and collecting. 2. The condensing device for halon-based solvent vapor according to claim 1, wherein the inside of the condensing pipe is arranged in a cooling tank.