JPS6349224A - Reversible heating and regeneration type dehumidifier by pressurized gas - Google Patents

Abstract

PURPOSE:To effectively utilize energy and to prevent gas loss caused by the discharge of one part of pressurized gas by providing a pre-adsorption tower and plural main adsorption towers and performing the heating and regeneration of an adsorbent with the gas heated by a pressurizer and a gas preheater. CONSTITUTION:Pressurized gas slightly imparted with heat of pressurization in a pressurizer 1 is furthermore heated by a gas preheater 3 and successively passed through a pre-adsorption tower 11, a changeover valve 6a and a main adsorption tower 8a and adsorbents 11a, 85 are heated and regenerated thereby. The gas passed through a conduit 116 is cooled by drain separators 9a, 9b and a cooler 10 to condense and separate water content and thereafter it is adsorbed and dehumidified in a main adsorption tower 8b and discharged to the outside of the system via a changeover valve 7b and a conduit 118 as the cooled and dehumidified gas. Then a valve 5b is closed and a valve 5a is opened and the gas fed from the pressurizer 1 is directly sent to the pre-adsorption tower 11 and the main adsorption tower 8a to cool the adsorbents. The gas passed through the conduit 116 is similarly adsorbed and dehumidified in the main adsorption tower 8b. Then the main adsorption tower 8b is changed over to heating and regeneration and the main adsorption tower 8a is changed over to adsorption and dehumidification.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pressurized gas dehumidifier, and more specifically, a pre-adsorption tower and a plurality of main adsorption towers are provided, and these adsorption towers are utilized. The present invention relates to a reversible heating and regeneration type pressurized gas dehumidification device that performs dehumidification by reversibly performing a cycle of heating and regenerating an adsorbent, dehumidifying it, and cooling it.

[Prior Art] Conventional heated gas dehumidification devices include devices using a non-heating regeneration method and a heating regeneration method. -193718M
When moisture in pressurized air or gas is removed by alternately repeating a pressurized adsorption step and a reduced pressure desorption step using two adsorption towers as described in the publication, heat exchange is performed in the adsorption tower. There is a method that improves the efficiency of draining desorbed water by inserting a container and passing untreated high-temperature air through it to suppress the temperature drop during adsorption.

In addition, as a dehumidifying device using the thermal regeneration method, two adsorption towers, a heating means such as a heater, and a cooling means such as a cooler are connected to the dehumidifying system via a four-way valve, and are used alternately. Some methods improve the discharge efficiency of desorbed water by removing water from the adsorption tower during non-adsorption operation.

[Problems to be Solved by the Invention] However, in a heated gas dehumidifier using the former non-thermal regeneration method, the difference between the pressure during adsorption and the pressure during regeneration is a predetermined pressure (2K
If y/i> or more, the adsorbent cannot be regenerated smoothly, and since surface adsorption of the adsorbent is utilized, the switching time interval cannot be longer than 5 to 30 minutes.

In addition, hot gas dehumidifiers using the latter thermal regeneration method often use four-way valves and three-way valves, and the flow path is complicated and difficult to control.Moreover, the processing flow rate is controlled according to the processing flow rate for regeneration. However, it was necessary to provide a proportional valve or an automatic valve, which made the system more complicated and less operable, and it was also uneconomical because it required a large pressure difference within the device, resulting in large energy losses. Also, the gas pressure is atmospheric pressure plus 1
It cannot be used at relatively low pressures below atmospheric pressure, and the minimum processing flow rate must be at least 45% of the maximum processing flow rate of the gas, otherwise the adsorbent activation will not occur due to insufficient thermal temperature required to activate the adsorbent. There were many flaws in being perfect.

[Purpose of the Invention] The reversible heating regeneration type pressurized gas dehumidification device of the present invention eliminates all the drawbacks of the above-mentioned prior art. The purpose is to preheat the pressurized gas to activate the adsorbent and promote the regeneration process.

[Means for Solving the Problems] In order to achieve the above object, the reversible heating regeneration type pressurized gas dehumidification device of the present invention has a pressurizer, a gas preheater, a pre-adsorption tower, and a pre-adsorption tower. A plurality of main adsorption towers and a cooler each having a considerably large adsorption capacity are provided, and the gas heat of the pressurized preheated gas obtained by heating the gas pressurized by the pressurizer with the gas preheater is used to preheat the preheating gas. A step of heating and regenerating the adsorbent in the adsorption tower and the adsorbent in one of the main adsorption towers, and regenerating the gas in the cooler, the other main adsorption tower, and the pre-adsorption tower. Cooling and the process of removing moisture from the gas are performed alternately.

[Configuration of Embodiment] As shown in FIG.
is branch-connected to the gas preheater 3 via a conduit 111, and connected to the conduit connection end 12a of the stainless steel can body 12 via a conduit 112 and the switching valve 5a, and the gas preheater 3 is connected to the conduit 113 and the switching valve 5a. Also connected to the conduit connection end 12a via the valve 5b, the dispersion plate 11e, a stainless steel perforated plate 11d provided on the side of the air flow dispersion plate, and the can body 1
The conduit connecting end 12b of the preadsorption tower 11 filled with adsorbent 11a processed into alumina beads between a pair of stainless steel nets 11b and 11C provided between the conduit connecting end 12b of the conduit 110 and the conduit connecting end 12b of the A common conduit 114 and 115 is connected to the conduit connection end 81a of the stainless steel can body 81 through the switching valves 6a and 6b, respectively, and the dispersion plate 8
A pair of stainless steel nets 84a and 84b are provided between a perforated stainless steel plate 83 provided on the side of the air flow dispersion plate 82 and the conduit connection end of the can body 81. A plurality of main adsorption towers 8a, 8 filled with agent 85
b, and the plurality of main adsorption towers are cooled at one end via conduits 116, 117 and a plurality of drain separators 9a, 9b each having a demister 92 made of stainless steel wire mesh installed in the can body 91. U-shaped cooling vibes 103 with fins 104 through which cooling water taken in from the water inlet/outlet 102 are connected to the ends of the cooler 10 equipped with a drain valve 105 inserted into the container body 101, and the conduit 1
A conduit 118 is connected from the connection point of the switching valves 7a and 7b connected between the switching valves 14 and 115.

The adsorption capacity of the pre-adsorption tower 11 and the capacity of the adsorbent 11a are each about one tenth of those of the main adsorption towers 8a and 8b.

[Function of the Invention] The reversible heating regeneration type pressurized gas dehumidification device of the present invention is constructed as described above, and hereinafter, the heating regeneration of the adsorbent 85 in the main adsorption tower 8a of this device and the dehumidification in the main adsorption tower 8b will be described. Action first
Explain using diagrams.

For example, the pressurized and heated gas at about 50°C, which is pressurized to atmospheric pressure plus 0.5 atm and given some pressurization heat, passes through the conduit 1113 and is further heated by the gas preheater 3.
The pressurized preheated gas becomes a pressurized preheated gas at about 20°C to 140°C, and this pressurized preheated gas passes through the conduit 113, the switching valve 5b, and the pre-adsorption tower 11, the open switching valve 6a, and the conduit 114 to the main adsorption tower 8a. The pressurized preheated gas is diffused and injected into the can body 81 by the dispersion plate 82 . At this point, the adsorbent 11a in the preadsorption tower 11 is regenerated by heating, but the adsorbent 85 is still activated with high-temperature gas of 100° C. or higher, and the gas discharged through the conduit 116 is precooled by the drain separator 9a, and then further cooled by the cooler. 10, the moisture condenses, and the drain separator 9b
The atomized water droplets and water droplets are separated, enter the main adsorption tower 8b through a conduit 717, come into contact with the adsorbent 85, are adsorbed and dehumidified, and are then passed through the switching valve 7b, which is open from the conduit 115, and the conduit 118, where moisture is removed and dried. The cooled dehumidified gas is released outside the system of this device.

After being activated as described above, the adsorbent 11a in the adsorption tower 11 and the adsorbent 85 in the main adsorption tower 8a are heated to 100°C.
Since the temperature is above, as shown in FIG. 2, the pressurized and slightly heated gas is supplied to the pre-adsorption tower 1 by closing the valve 5b and opening the valve 5a to supply the cooled dry gas at a temperature of 20° C. or lower to the pre-adsorption tower 1. and into the main adsorption tower 8a through the opened valve 6a, and brought into contact with the activated adsorbents 11a and 85 at the high temperature,
While cooling these adsorbents to a low temperature of about 30° C., they are passed through conduit 116, drain separator 9a, cooler 10, drain separator 9b and conduit 117 into main adsorption tower 8b, and dehumidified with adsorbent 85. Cooling and dehumidifying gas is discharged outside the system of the apparatus through the open switching valve 7b and the conduit 118.

After this, we will discuss heating regeneration of the adsorbent 85 in the main adsorption tower 8b and dehumidification in the main adsorption tower 8a.As shown in FIG. The conduit 111.113 is preheated to 120°C to 140°C.
and the switching valve 5b which has been cooled and dehumidified in the preadsorption tower 11 and is open, the preadsorption tower 11 and valve 6b, and the conduit 115.
It passes through and enters the main adsorption tower 8b.

At this time as well, the adsorbent 11a in the pre-adsorption tower 11 is heated and regenerated as in the case of FIG. The dispersed and injected adsorbent 85 is heated and regenerated, and the gas cooled by the conduit 117, drain separator 9b, and cooler 10 enters the main adsorption tower 8a through the drain separator 9a and the conduit 116, and then passes through the open switching valve 7a. , the cooled dehumidified gas is discharged out of the system through conduit 118.

After being activated as described above, the adsorbent 11a in the preadsorption tower 11 and the adsorbent 85 in the main adsorption tower 8b are heated to 100°C.
Since the temperature is above that, the valve 5b is closed, the valve 5a is opened, and the cooled dry gas of 40° C. or less is transferred to the pre-adsorption tower 1. Then, it is sent to the adsorption tower 8b through the opened valve 6b, and brought into contact with the activated adsorbents 11a and 85 at the high temperature, and while cooling these adsorbents to a low temperature of about 40°C, the conduit 116 and drain Separator 9a1 cooler 10. Main stage @ tower 8b through drain separator 9b and conduit 117
the switching valve 7, which is dehumidified by the adsorbent 85 and opened.
The cooled dehumidified gas is discharged outside the system through the bSl pipe 118.

[Effects of the Invention] As described above, the present invention includes a pressurizer 1, a gas preheater 3, a preadsorption tower 11, and a plurality of main adsorption towers 8a and 8b whose adsorption capacity is considerably larger than that of the preadsorption tower 11. The adhesive in the preadsorption tower 11 is heated by the gas heat of the pressurized preheated gas obtained by heating the gas pressurized by the pressurizer 1 by the gas preheater 3. 11a and main adsorption tower 8
Adsorbent 8 in the main adsorption tower of either a or 8b
5 and the step of cooling the gas and removing moisture from the gas in the cooler 10, the other main adsorption tower, and the pre-adsorption tower 11 are alternately performed. Since the adsorbent in the main adsorption tower and the pre-adsorption tower 11 is heated and regenerated using the pressurized heat and the gas heat of the preheated gas further heated by the gas preheater, energy is effectively used. In addition to being able to eliminate all of the drawbacks of the prior art mentioned above, there is no gas loss because there is no partial release of pressurized gas to the outside, and it is very economical when using expensive gas. In addition, this invention is particularly effective in cases where the gas pressure is low and the gas temperature is low, such as in the case of rare gases, and the invention has great industrial effects.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention, and FIGS. 1 to 3 are block diagrams of a reversible heating regeneration pressurized gas dehumidifier that also serves to explain the cooling and dehumidifying process of pressurized and heated gas. It is. 1... Pressurizer, 3... Gas preheater, 8a, 8b...
- Main focus @ tower, 10... Cooler, 11... Pre-adsorption tower, 11a, 85... Adsorbent.

Claims (1)

[Claims] A pressurizer 1, a gas preheater 3, a pre-adsorption tower 11, a plurality of main adsorption towers 8a, 8b having considerably larger adsorption capacity than the pre-adsorption tower 11, and a cooler 10 are respectively provided, and the pressurizer 1 Using the gas heat of the pressurized preheated gas obtained by heating the pressurized gas in the gas preheater 3, the adsorbent 11a in the preadsorption tower 11 and either one of the main adsorption towers 8a and 8b are heated. a step of heating and regenerating the adsorbent 85 in the main adsorption tower;
Reversible heating regeneration type pressurization characterized in that the cooling of the gas and the step of removing moisture from the gas are performed alternately in the cooler 10, the other main adsorption tower, and the pre-adsorption tower 11, respectively. Gas dehumidifier.