JPH06319933A - Adsorbing device - Google Patents

Abstract

PURPOSE:To provide an adsorbing device capable of safely and certainly performing desorption within a short time using a small amt. of inert gas. CONSTITUTION:In an adsorbing device having a double cylindrical metal net basket 6 including an adsorbent 5, a U-shape or spiral heat conductive pipe 2 for heating and cooling the adsorbent 5 is provided in the basket 6. A desorbing inert gas heater 4 can be also provided to the outside of the basket 6 and, further, a piping system passing a heating medium and a cooling medium can be also connected to the heat conductive pipe 2 and an air introducing pipe and a medium withdrawing pipe can be also provided in the system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adsorption device, and more particularly to an adsorption device which requires dry heating / cooling of an adsorbent layer during desorption.

[0002]

2. Description of the Related Art A conventionally known adsorption tower is shown in FIG. In FIG. 7, the adsorption tower 1 is composed of a double cylindrical wire mesh basket 6 in which an adsorbent layer 5 is contained, and 3 is an outer jacket. The adsorption tower as shown in FIG. 7 can achieve the purpose by directly contacting the adsorbent in the basket with the air flow when an air flow having a sufficient heat flow can be used as a heating / cooling medium. In the adsorbent layer 5 that adsorbs decomposable organic solvent components such as ketones and esters, it is not allowed to flow a large amount of high temperature air as a safety measure. In the case of such an adsorbent layer, there are the following problems.

(1) In the above case, it is necessary to desorb the solvent component using an inert gas (eg, nitrogen gas) as a carrier gas, but to reduce the utility cost, the air volume is reduced and the solvent concentration is increased. It is necessary to shorten the desorption time. However, with a small flow rate of the inert gas within the temperature constraint that does not affect the decomposition of the solvent,
The amount of heat exchange by direct ventilation is small, and the time required for heating and cooling is long. (2) In the case of using the inert gas of (1), even if the temperature of the inert gas is heated by a small flow rate inert gas heater, if the path is long, it cools before reaching the basket due to heat loss. The effect of desorption is impaired.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention solves the above problems and provides an adsorption device capable of performing desorption with a small amount of inert gas in a short time safely and reliably. Is an issue.

[0005]

In order to solve the above-mentioned problems, in the present invention, in an adsorption device having a double cylindrical wire mesh basket containing an adsorbent, the adsorbent is heated and cooled in the basket. The U-shaped or spiral heat transfer tube is provided. In the above adsorption device, a desorption inert gas heater can be built in the outside of the wire mesh basket, and a pipe system for passing a heating medium and a cooling medium is connected to the heat transfer tube, and in the system. It is also possible to provide an air introduction pipe and a medium withdrawal pipe.

[0006]

In the present invention, the heat transfer tube is provided in the adsorbent layer in the basket, as opposed to the conventional heating of the adsorbent by high temperature air, so that the adsorbent layer is indirectly heated and cooled by the heating / cooling medium. In addition to having a function, and by incorporating a heater in the adsorption device, unlike the conventional device with a long inert gas path, the temperature of the inert gas from the heater outlet to the adsorption tower can be radiated. It was possible to prevent the decline.

Further, by providing a medium withdrawing mechanism by introducing pressure or normal pressure in the heating / cooling system, rapid heating at the time of desorption, rapid cooling for adsorbing standby, cooling from heating to cooling It is possible to prevent hammering due to heat shock of the heat transfer tube when switching from heat to heating.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings, but the present invention is not limited thereto. Example 1 FIGS. 1, 3 and 5 are cross-sectional explanatory views showing an example of an adsorption tower of the present invention, and FIGS. 2 and 4 are AA cross-sectional views of FIGS.
In FIG. 1, 1 is an adsorption tower, 2 is an adsorbent layer heat transfer tube, here a U-shaped tube, 3 is an outer jacket, 5 is an adsorbent layer, 6 is a double cylinder wire mesh basket, An inlet 7 and an outlet 8 for a cooling or heating medium are connected to the U-shaped tube 2.

FIG. 3 is the same as FIG. 1 except that the adsorbent layer heat transfer tube 2 in FIG. 1 has a spiral shape. Also, FIG.
Is an inert gas heater 4 at the bottom of the adsorption tower 1 in FIG.
Is provided. FIG. 6 shows a systematic diagram of adsorption / desorption operation using the adsorption tower of the present invention.

Next, the operation of the adsorption tower of the present invention will be described with reference to FIG. In addition, in FIGS. 1, 3, 5, and 7, solid arrows indicate the gas flow during adsorption, and dotted arrows indicate the gas flow during desorption. As a desorption operation of the adsorption tower that has reached the adsorption breakthrough, when the temperature of the adsorbent layer is heated from normal temperature to a temperature suitable for desorption, the adsorption layer heat transfer tube 2 and the jacketed case remain in the outer jacket 3 The cooling medium is extracted by opening the extraction valve 11. In this case, the air introduction pipe 17
And vent valve 18 is opened to facilitate media withdrawal.
The extracted cooling medium is returned to the cooling medium tank 9 to prepare for the next cooling medium.

In FIG. 1 and FIG. 3, a heating / cooling heat transfer tube 2 is provided in a basket 6 with a wire mesh of the adsorption tower main body 1, and a heating / cooling medium is caused to flow from the medium inlet 7 into the heat transfer tube 2. Heating of the adsorption layer even when the flow rate of active gas is low
It is designed to be sufficiently cooled. As an operation, in FIG. 6, the heating medium valve 15 is opened, and the heating medium is flown into the heat transfer tube 2 and the jacket 3 in the case of having a jacket to heat the same. If the heating medium is a gas such as water vapor, it is returned to a steam boiler or the like as condensed water. If the heating medium is liquid, it is returned to the heating medium tank to prepare for the next heating operation.

When the desorption is completed and the desorption tower needs to be cooled, the heating medium is first withdrawn and the cooling medium is caused to flow through the heat transfer tube 2 as in the above heating medium operation. FIG. 5 shows an integrated inert gas heater and an adsorption tower. During the desorption operation, the inert gas supply valve 12 is opened to pass through the inert gas heater 4 and
An inert gas is passed through the adsorption layer 5 and is exhausted as a desorption gas containing a desorption component to the recovery device.

[0013]

According to the present invention, by providing a heat transfer tube having a function of heating / cooling an adsorbent in a double wire mesh basket, the flow rate of the desorbing inert gas can be at least sufficiently heated / cooled in the adsorbent layer. It has become possible. In addition, by integrating the adsorption tower and the inert gas heater, the heat dissipation loss and heat capacity of pipes, valves, etc. can be reduced, and heating for desorption can be performed.
The effect of shortening the cooling time was obtained. Further, by providing the heating / cooling medium extraction pipe and the air introduction pipe, it is possible to prevent the heat shock and the hammering when the high temperature fluid and the low temperature fluid are mixed in the same desorption tower.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing an example of an adsorption tower of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional explanatory view showing another example of the adsorption tower of the present invention.

4 is a sectional view taken along line AA of FIG.

FIG. 5 is an explanatory cross-sectional view showing another example of the adsorption tower of the present invention.

FIG. 6 is a system diagram of the adsorption / desorption operation of the adsorption tower of the present invention.

FIG. 7 is a cross-sectional explanatory view of a conventional adsorption tower.

[Explanation of symbols]

1: adsorption tower, 2: adsorption layer heat transfer tube, 3: outer shell jacket,
4: Inert gas heater, 5: Adsorbent layer, 6: Double cylindrical wire mesh basket, 7: Medium inlet, 8: Medium outlet, 9: Cooling medium tank, 10: Heating medium tank, 11, 12, 1
3, 14, 15, 16, 17, 18: valve,

Claims (3)

[Claims] 1. An adsorption device having a double-cylinder wire mesh basket containing an adsorbent, wherein a U-shaped or spiral heat transfer tube for heating and cooling the adsorbent is provided in the basket. Adsorption device. 2. The adsorption device according to claim 1, wherein a desorption inert gas heater is incorporated inside the wire mesh basket. 3. The adsorption according to claim 1, wherein a pipe system for passing a heating medium and a cooling medium is connected to the heat transfer pipe, and an air introduction pipe and a medium withdrawal pipe are provided in the system. apparatus.