JPH0394809A - Dry type dehumidifier - Google Patents

Abstract

PURPOSE:To reduce heat loss by providing the adsorption body provided with a heat exchanging member, the adsorption tower housing the adsorption body, and exhausting means, and a selecting means. CONSTITUTION:A medium is compressed by a compressor 29 to be in a high temp., and supplied to the adsorption body 25 in a 1st adsorption tower 31 as a heating medium. The heating medium discharged from the 1st adsorption tower 31 is passed through an expansion valve 30 to be expanded with its temp. lowered, and supplied to the adsorption body 25 in a 2nd adsorption tower 32 as a cooling medium. The first adsorption tower 31 is evacuated by a pump 38 to have its inside pressure reduced and the heating medium flows into pipes 26 of the housed adsorption body 25 to raise the temp. of fins 27, thus the adsorbent 28 being in contact with the fins 27 is swiftly heated. The moisture adsorbed in the adsorbent 28 is desorbed and discharged. By this method, the adsorption efficiency is sharply improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a dry dehumidifier that removes moisture from gas using an adsorbent, and particularly to a dry dehumidifier that does not use high-temperature regeneration gas when regenerating the adsorbent.

[Prior Art] FIG. 3 is a block diagram showing a conventional two-column switching type dry dehumidifier. The gas to be treated containing moisture is supplied to the gas inlets of the first and second adsorption towers 1.2 via the pipe 3 and pipes 3a and 3b branched from the pipe 3.

The adsorption towers 1 and 2 are filled with a moisture adsorbent in the form of pellets, etc., and while the gas to be treated flows through the adsorption tower 1.2, the water adsorption material absorbs moisture in the gas to be treated. water is removed. Note that a blower 7 and a cooler 8 are installed in the pipe 3, and on-off valves 11a and flb are installed in the branch pipes 3a and 3b, respectively. Further, the dry gas obtained after drying the gas to be treated in the adsorption tower 1.2 is discharged from each adsorption tower 1, 2 via piping 4 a e 4 b, and is transferred from each piping 4 a, 4 b to piping 4. The gases are combined and supplied to a drying gas source such as indoors. Each of these piping 4a,
4b respectively have on-off valves 12a. 12b is interposed.

On the other hand, the regeneration gas is supplied to the first and second adsorption towers 1.2 via the pipe 5 and branch pipes 5a and 5b branched from the pipe 5, respectively. A pump 9 and a heater 10 are installed in this pipe 5, and furthermore, a branch pipe 5 a +
Opening/closing valves 13a and 13b are respectively installed in the opening/closing valves 5b. Further, the exhaust gas after regenerating the adsorbent in the adsorption towers 1 and 2 is transferred to the first and second adsorption towers 1. 2 to piping 8a+
8b and from each pipe ea, $1) to pipe 6
and is discharged outdoors. In addition, piping 8a, 6b
have on-off valves 14a, respectively. 14b is interposed.

In the conventional dehumidifier configured in this way, the first
And the second adsorption towers 1 and 2 are caused to perform an adsorption step and a regeneration step alternately. First, the first adsorption tower 1 performs an adsorption process,
When the second adsorption tower 2 is in the regeneration process, the on-off valve 11
a+ 12a+ 14bt13b is opened, and on-off valve t4a+ 13a. Close flb and 12b. Then, after the gas to be treated is cooled by the cooler 8,
It is supplied to the first adsorption tower 1 via the pipes 3 and 3a, and the first
The moisture in the gas is removed by the moisture adsorbent filled in the first adsorption column 1 after passing through the adsorption column 1 . The dry gas after water removal is then supplied to a dry gas usage source indoors or the like via the pipes 4a, 4.

On the other hand, the second adsorption tower 2 houses the adsorbent after moisture adsorption.
After the regeneration gas is heated by the heater 10, it is supplied through the pipe 5.5b.

This high-temperature regeneration gas flows through the adsorbent packed in the second adsorption tower 2, heats the adsorbent, and desorbs and removes the moisture that has been adsorbed up to that point. Thereby, moisture is removed from the adsorbent in the second adsorption tower 2 and the adsorbent is regenerated. The gas after regeneration is transferred to piping 6b. 6 and is discharged to the outside.

Next, after the adsorption capacity of the adsorbent in the first adsorption tower 1 is saturated and the regeneration of the adsorbent in the second adsorption tower 2 is completed, the on-off valve 1
4a, 13a, 1 lb. 12b is opened and on-off valve 1 is opened.
1a, 12a, 14b. 13b is closed. As a result, the second adsorption tower 2 is supplied with the low-temperature water-containing gas to be treated, which has been cooled by the cooler 8, and the adsorption inside the second adsorption tower 2, which has become humid due to the passage of the regeneration gas, is carried out. While the material is cooled, moisture in the gas to be treated is adsorbed by the adsorbent and removed. This dry gas is supplied to the room etc. via piping 4.

On the other hand, high-temperature regeneration gas heated by the heater 10 is supplied into the first adsorption tower 1 to heat the adsorbent in the first adsorption tower 1, so that the adsorbent is Remove the moisture that has been adsorbed on the

The regenerated gas is then discharged to the outside through the pipe 6.

In this manner, the adsorption step and the regeneration step are selectively and alternately carried out in the two adsorption towers 1 and 2, thereby continuously drying the gas to be treated.

C Problems to be Solved by the Invention However, in this conventional dry dehumidification device, in order to regenerate the adsorbent that has adsorbed water, regeneration gas obtained by heating external air, etc. is used as a means to give energy to the adsorbent. I am using it. Therefore, there is a problem that heat loss in the pipes 5s 5a+ 5b is large.

Furthermore, although the temperature of the adsorbent increases due to heating during regeneration, the adsorption effect of the adsorbent decreases significantly at high temperatures. For this reason,
In order to increase adsorption efficiency, it is necessary to cool the adsorbent when transitioning from the regeneration process to the adsorption process. Therefore, as shown in FIG. 3, it is necessary to provide a cooler 8 in the piping 3. As described above, it is necessary to cool the gas to be treated prior to adsorption, which increases the processing cost and causes heat loss due to temperature rise in the pipes 3.3a+3b.

Furthermore, in order to improve the adsorption efficiency, another third adsorption tower is provided, and the three adsorption towers selectively perform the adsorption process, the regeneration process, and the cooling process alternately. In this case, dry gas obtained from an adsorption tower performing another adsorption step may be cooled and used as a cooling gas for the adsorbent in the adsorption tower. However, in this case, the third
Since it is necessary to provide an adsorption tower, the equipment cost increases and switching control of piping and on-off valves becomes complicated.

The present invention has been made in view of such problems, and includes:
It is an object of the present invention to provide a dry dehumidifier that can dehumidify a gas to be processed with low thermal loss and high efficiency.

[Means for Solving the Problems] The dry dehumidification device according to the present invention comprises an adsorbent comprising a moisture adsorbent and a heat exchange member bonded to the moisture adsorbent and through which a heating medium or a refrigerant flows; a plurality of adsorption towers storing adsorbents; a gas to be processed flow means for passing a gas to be treated through the adsorption towers to obtain dry gas; an exhaust means for exhausting the inside of the adsorption tower; and a selection means for selectively selecting between the flow of the gas to be treated and the flow of a refrigerant to the heat exchange member, and the flow of exhaust by the exhaust means and the flow of a heat medium to the heat exchange member. It is characterized by

[Function] In the present invention, the selection means selectively allows the heat medium to flow through the heat exchange member of the adsorbent housed in the first adsorption tower, and the evacuation means Exhaust by. Then, this heat exchange member heats the adsorbent adhered to it, and the adsorbent increases in humidity and adsorbs the moisture that was adsorbed in the previous adsorption process. In addition, the selection means is the second
A refrigerant is made to flow through the heat exchange member of the adsorbent housed in the second adsorption tower, and a gas to be treated is made to flow through the second adsorption tower. Then, the adsorbent in the second adsorption tower is cooled by the heat exchange member through which the refrigerant is flowing, and receives the flow of the gas to be treated to remove moisture from the gas. In this case, the adsorbent is kept at a low temperature where the adsorption efficiency is high;
This adsorbent adsorbs and removes moisture with high efficiency. In this way, by selectively and alternately repeating the supply of the refrigerant or heating medium and the supply of the gas to be treated to the adsorption tower or the exhaust of the adsorption tower, the dehumidification process of the gas to be treated is continuously carried out. be able to.

In addition, even if there is another adsorption tower other than the first and second two adsorption towers, the adsorption and regeneration of the adsorbent is performed by the same flow control of the gas to be treated and the refrigerant and heat medium. be able to.

In this way, the dry dehumidification device according to the present invention eliminates the need for high-temperature regeneration gas (heated air) as in the conventional method to eliminate moisture by the adsorbent, and instead applies a heat medium to the heat exchange member that is in contact with the adsorbent. This is obtained by direct heating of the adsorbent by this heat exchange member by passing a current through it. Further, in the adsorption step, the adsorption step is carried out at a low temperature at which the adsorption efficiency of the adsorbent is high.

In this case as well, the adsorbent itself is directly cooled by the heat exchange member, instead of cooling the gas to be treated by a cooler as in the conventional case. Therefore, the adsorbent material is directly and rapidly subjected to heating and cooling. Therefore, the thermal efficiency with respect to the adsorbent is high, and the loss of heat in the piping system is also small.

In addition, silica gel, zeolite,
Activated alumina or activated carbon may be used, and a mixture of these materials may also be used. Further, the shape of the moisture adsorbent may be a pellet-like shape, in addition to a monolith-like molded body such as a honeycomb molded body.

Further, examples of the heating medium include steam, hot water, heating oil, and heating fluorocarbon liquid. Further, as the refrigerant, there are cooling water, chilled water, cooling oil, and cooling Freon liquid. Furthermore, a medium such as water can also be recycled as steam or cooling water.

[Example] Next, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an adsorbent incorporated in a dry dehumidifying device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing this dry dehumidifying device.

The moisture adsorbent 25 shown in FIG.
It is configured as a heat exchanger type that has a backbone.

That is, thin plate-shaped fins 27 are fitted into a plurality of vibrators 26 through which heat medium and coolant flow. This fin 27
are arranged in parallel with an appropriate distance between them, and are adhesively fixed to the vibrator 26. An adsorbent 28 made of, for example, a rectangular parallelepiped honeycomb molded body is fitted between the fins 27 and is adhesively fixed to the hood 7.

The temperature of the moisture adsorbent 25 with this structure can be increased by passing a heating medium through the vibrator 26.
is heated and its temperature rises, and the temperature of the adsorbent 28 that has been adhesively fixed to the fins 27 rises. As a result, the adsorbent 28 absorbs moisture. On the other hand, by flowing the refrigerant through the pipe 26, the fan 27 is cooled and its temperature is lowered, and the adsorption mill 28 in contact with the fin 27 is cooled down to a temperature range where the adsorption effect is excellent.

The moisture adsorbent 25 shown in FIG. 1 is used in the adsorption tower 3J of the dry dehumidification apparatus shown in FIG. ．． 32.

In this dry dehumidifier, the gas to be treated is adsorbed by the pipe 33 and pipes 33a and 33b branched from the pipe 33. It will be introduced on 31.32.

A blower 37 is installed in the pipe 33 to send the gas to be treated to the adsorption towers 31 and 32, and the branch pipe 33
a. 3' and 3h each have an on-off valve 41a. ．． 4lb has been inserted. On the other hand, piping 34. a and 34b are connected, and the pipe 34a
, 34b are all completely connected to the piping 34, and the dry gas that has reached the ul peak from the adsorption towers 31, 32 can be supplied to a dry gas usage source such as indoors via the piping 34. Note that on-off valves 42a and 42b are installed in these pipes 3.4a and 3Jb.

Further, piping 36a, 3el) is connected to the first and second suction tM3i, 32, respectively, and this piping 38a
．． 36b is commonly connected to the pipe 3B. A bomb 38 is installed in this pipe 36, and the inside of the adsorption tower 31, 32 is sucked and exhausted by this bomb 38. Note that the pipes 3ea and 36b are provided with on-off valves 4Ja. 44b is interposed.

The inlet and discharge mark of the heat medium or refrigerant in the adsorbent 25 housed in the adsorption tower 31 and the discharge mark and discharge mark of the heat transfer medium or refrigerant in the adsorbent 25 fully housed in the adsorption tower 32, respectively. Introduction L] means piping 45, 46 (or piping 46) respectively.
．． 45).Thereby, the medium flowing in the bubble 26 of the adsorbent 25 is connected to the pipe 45+4.
6, it can be circulated and supplied between the adsorption tower 31 and the second adsorption tower 32. In addition, since the medium flows back and forth through the pipes 45 and 46, both ends of the vibrator 26 in the two adsorbents 25 alternate their functions as an inlet and an outlet at a suitable pitch. Become.

The expansion valve 30 is interposed in the pipe 45, and the compressor 8 is installed in the pipe 46. This compressor 2g compresses the medium and sends out the heat medium as a highly mixed compressed gas. On the other hand, the amount of heat used to heat the adsorbent in the adsorption tower is taken away,
The medium, which has cooled and become a liquid ε, passes through the expansion valve 30 and expands, becoming a low-temperature reduced pressure gas. Therefore, this expansion valve 3
The medium that has passed through 0 becomes a refrigerant.

Note that the supply of the heat medium or refrigerant is alternately switched between the first adsorption tower 31 and the adsorption tower 32 of the broom 2 by a piping mechanism including appropriate piping and on-off valves. Therefore, each time the switching occurs, the flow direction of the heat medium and coolant in the pipes 45 and 46 is reversed as described above.

In the dry dehumidification apparatus according to this embodiment configured in this way, first, when the first adsorption tower 31 performs the PI production process and the second adsorption tower 32 performs the adsorption process, the on-off valves 44a, 4
lb. 42be open, on/off valve 4l1b, 41. am 4
．． Open 2a. Then, the heat medium is applied to the adsorbent 25 in the first adsorption tower 31 , and the heat medium from the compressor 28 is made to flow through the vibrator 26 . Therefore, the adsorbent 2 in the second adsorption tower 32
5, the refrigerant from the expansion valve 30 is made to flow through it. That is, this medium is compressed by the compressor 28 to reach a high temperature, and then is supplied to the adsorbent 25 in the first adsorption tower 31 as a heat medium. Then, the heat medium discharged from the first adsorption tower 31 passes through the expansion valve 3o, expands, and becomes low temperature.
It becomes a refrigerant and is supplied to the adsorbent 25 in the second adsorption tower 32.

In this way, the inside of the first adsorption tower 1 is evacuated by the pump 38 and becomes under reduced pressure, and the first adsorption tower 31
A heating medium flows through the pipe 26 of the adsorbent 25 housed therein, raising the temperature of the fins 27, and rapidly raising the temperature of the adsorbent 28 in contact with the fins 27. This results in
The moisture adsorbed by the adsorbent 28 is desorbed. The desorbed moisture-containing air is pumped to a pipe 36 by a pump 38.
．． By suctioning and exhausting the inside of the first adsorption tower 31 through 38a, it is discharged from the first adsorption tower 3l. By directly contact heating the adsorbent 28 with the heat exchanger type fins 27 and placing the heated adsorbent 28 under reduced pressure, the moisture adsorbed on the adsorbent 28 can be removed with high efficiency. removed.

On the other hand, the gas to be treated is supplied to the second adsorption tower 32,
Moisture is removed and dried by the adsorbent 28 in the adsorption tower 32. This dry gas is supplied into the room via piping 34. In this case, since the refrigerant from the expansion valve 30 is flowing through the vibrator 26 of the adsorbent 25 housed in the second adsorption tower 32, the adsorbent 28 is moved by the refrigerant through the fins 27. It is cooled. Therefore, this adsorbent 28 adsorbs moisture at a low temperature at which an excellent adsorption effect can be obtained, so that its adsorption efficiency is extremely high.

Next, when the adsorption capacity of the adsorbent 28 in the second adsorption tower 32 is saturated or just before it is saturated, the on-off valves 41a, 42a, 44
b is opened, and on-off valves 44a, 4lb, and 42b are closed. Then, the compressor 2
9, the adsorbent 25 in the first adsorption tower 1
, the refrigerant from the expansion valve 30 is supplied.

As a result, the adsorbent 28 in the second adsorption tower 32 is regenerated, and the gas to be treated passes through the adsorbent 28 in the first adsorption tower 31 to remove moisture.

In this way, the first and second adsorption towers 31 and 32 alternately and selectively perform the adsorption process and the regeneration process, so that the gas to be treated containing moisture is continuously dried. .

In this example, the adsorbent 28 in the adsorption tower 31, 32
is heated or cooled by supplying a heat medium or a coolant to the vibrator 26 via the fins 27 that are in contact with the adsorbent 28 .

Therefore, there is no heat loss in piping or the like as in the prior art, and the temperature of the adsorbent can be raised or cooled extremely quickly.

Therefore, thermal energy can be used effectively and adsorption efficiency can be increased. Since the processing is speeded up, the time required for one step can be shortened when the amount of gas to be treated is the same, and therefore the amount of adsorbent required can be reduced. Further, the required input energy in this embodiment is only the power supplied to the compressor 29, and in combination with the above-mentioned speeding up of processing, the total amount of input energy is reduced compared to the conventional case. Furthermore, the device can be made smaller and the cost of the device can be reduced.

Next, test results obtained by actually carrying out the drying treatment and treatment according to the above embodiment will be explained.

A 5°C refrigerant is supplied to the pipe 26 of the adsorption tower on the adsorption process side, and a refrigerant of 80°C is supplied to the pipe 2e of the adsorption tower on the regeneration process side.
℃ was supplied to heat the adsorbent on the regeneration side to 80''C, and the adsorbent on the adsorption side was cooled to 5℃.
The adsorption process and regeneration process were switched at a pitch of minutes. As a result, the obtained dry air has an absolute humidity of 0. 024g
/kg', and the dew point was extremely stable at -50°C.

[Effects of the Invention] According to the present invention, since the adsorbent is directly heated or cooled by selectively supplying a heat medium or a refrigerant to the heat exchange member bonded to the adsorbent, it is possible to regenerate the adsorbent. The heating efficiency is extremely high, and the loss of thermal energy is extremely low. Furthermore, since the adsorbent can be cooled during adsorption, the adsorption efficiency can be significantly increased. Furthermore,
The device configuration is extremely simple.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an adsorbent used in a dry dehumidifier according to the first embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of the dry dehumidifier according to the first embodiment. FIG. 3 is a block diagram showing a conventional dry dehumidifier. 1.2, 31.32; Adsorption tower, 25; Adsorbent, 26; Vibrator, 27; Fin, 28; Adsorbent, 29; Compressor, 3
0; Expansion valve} 34 Fig. 2 ↑ L2 cold air

Claims (4)

[Claims] (1) an adsorbent comprising a moisture adsorbent and a heat exchange member adhered to the moisture adsorbent through which a heating medium or a refrigerant flows;
a plurality of adsorption towers housing the adsorbent; a gas flow means for passing the gas to be treated through the adsorption tower to obtain dry gas; an exhaust means for exhausting the inside of the adsorption tower; Selection means for selectively selecting between the flow of the gas to be treated through the tower and the flow of the refrigerant through the heat exchange member, or the exhaust by the exhaust means and the flow of the heat medium through the heat exchange member; A dry dehumidifier comprising: (2) The dry dehumidification device according to claim 1, wherein the moisture adsorbent is in the form of pellets. (3) The dry dehumidification device according to claim 1, wherein the moisture adsorbent has a monolith shape. (4) The heat exchange member installed in one adsorption tower and the heat exchange member installed in the other adsorption tower are connected in parallel by two pipes, and one pipe An expansion valve is installed in one pipe, and a compressor is installed in the other pipe.The gas compressed by the compressor is used as a heat medium, and the gas expanded by the expansion valve is used as a refrigerant. The dry dehumidification device according to any one of claims 1 to 3.