JPH03188918A - Gas adsorption method - Google Patents

Abstract

PURPOSE:To carry out the desorbing regeneration of high efficiency using small necessary quantity of heat by making the temperatures of regeneration gas in the inlets of >=2 regeneration zones to be higher in order and regenerating each part of rotor. CONSTITUTION:The gas adsorption rotor 1, in which numerous small through- holes are provided from one end surface to the other end surface and gas adsorbent is exposed on the surface on each small through-hole, is constituted in such a way that a purge zone 15, an adsorption zone 4, and >=2 regeneration zones 5a-5c in the roter are put into action in order accompanied with the revolution of the rotor. The temperatures of regeneration gas in the inlets of >=2 regeneration zones 5a-5c is made to be higher in order and each part of the roter 1 is regenerated. As a result, the desorbing regeneration of high efficiency is carried out using smaller necessary quantity of heat compared with the single stage desorbing regeneration with a single high temp. gas.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention uses a rotor having a large number of small holes to reversibly absorb or adsorb (hereinafter referred to as sorption) moisture and other active gases (hereinafter referred to as gases). A gas sorption method in which a sheet is formed with a sorbent coated on its surface, and a processing gas and a regeneration gas are passed alternately through the small holes to obtain a gas removed by sorption, such as dry air. It is related to.

Prior Art A rotor, that is, a honeycomb rotor, having many small perforations is formed of a sheet having a gas sorbent on its surface that reversibly adsorbs gas, and the process gas and regeneration gas are contained in the small perforations. A method of obtaining a gas removed by sorption by passing the gas alternately through the gas is known (for example, see FIG. 7 of Japanese Patent Publication No. 1-25614).

This method involves rolling up a single-wave molded article of fiber-free paper into a cylindrical shape, which contains a moisture absorbent such as activated silica gel and has a portion of the moisture absorbent on the surface. A dehumidifier element 1 having a hole through it is molded, and the dehumidifier element 1 is rotatably held in a casing 2 as shown in FIG. The element 1 is rotated by a gear motor and a drive belt 7, and high-humidity treated air 8 is fed into the treatment zone 4, and high-temperature, low-humidity regeneration air 9 is fed into the regeneration zone 5. It dehumidifies to obtain dry air lO. In the figure, 11 is a pulley, 12 is a tension pulley, 13 is a rubber seal, and 14 is a regenerated air heater.

Problems to be Solved by the Invention The part that consumes the most energy in the above-mentioned dehumidification and other gas sorption processes is the amount of heat required to desorb the sorbed gas, which is essential for continuous operation, or to heat the regeneration gas required to regenerate the rotor. be. Therefore, it is required to improve the efficiency of gas sorption by minimizing the amount of heat required to heat the regeneration gas.

Means for Solving the Problems The present invention, in response to the above-mentioned requirements, divides the regeneration zone into two or more parts, first heats the rotor part immediately after sorbing gas to a relatively low temperature, and gradually increases the heating temperature. By desorbing the sorbed gas and regenerating the rotor through multi-step heating to increase the temperature, highly efficient desorption regeneration can be achieved using a smaller amount of heat than when desorption and regeneration is performed in one step using a single high-temperature gas. It is something to do.

The embodiment will be described below with reference to the drawings. A dehumidifier is assembled in the same manner as shown in FIG. The holes are opened so as to be divided into a stage regeneration zone 5b and a third stage regeneration zone 5C, and as shown in FIGS. 2 and 3, the purge zone 15 has ambient temperature air OA, the processing zone 4 has the treated air 8 to be dehumidified, The regeneration zone is configured so that low-humidity regeneration air 9 is heated by heaters 14a, 14b, and 14c and then introduced. Outside air OA entering purge zone ■5
may be partially or completely replaced with treated air 1O.

According to the example of Japanese Patent Application No. 60-86969, the wave length of the corrugated paper is 3.3 mm, the wave height (3) is 1.9 mm, the rotor diameter is 320 mm, and the thickness is 20 mm.
The above dehumidifier is assembled using the dehumidifying rotor 1 formed to a size of 0 mm and deposited with aluminum silicate erotic gel, the center angle of the dehumidifying zone 4 is 180°, and the regenerating zones 5a, 5b, 5c are set.
and the center angle of the purge zone 15 is 45°, respectively. Example rotor rotational speed (rpb) Inlet treated air temperature (0C) Inlet treated air flow rate (+n/sec) 58 Inlet regeneration air temperature (0C) 5b Artificial regeneration air vortex degree (0C) 5C inlet regeneration air temperature (0C) Artificial regeneration air flow rate (In/sec) Inlet regeneration air absolute humidity A B 18 18 30 30 2 100 125 125 125 150 125 2 2 (Same as artificial treatment air line vs. humidity ) 30 30 2 (Same as inlet processing air temperature and humidity) (4) Inlet purge air temperature (0C) Inlet purge air flow rate (m/sec) Results when dehumidifying is performed under the conditions of inlet purge air absolute humidity, that is, removal? Figure 4 shows the performance. However, B is a control example.

Next, change the flow rate of the artificial purge air, and the other conditions are the same as above - Example CAD Rotor rotation speed (rph) 18 18
18 Population processing air temperature (in) 30 30
30 Population processing air flow rate (wI/sec) 2 2 2
58 Inlet regeneration air temperature ('C11001001005b
Inlet regeneration air temperature f Tel 125 125
1255c Inlet regeneration air temperature 1' (:) 15
0 150 150 Artificial regeneration air flow rate (1117 seconds) 2 2 2 Artificial regeneration air line vs. humidity (same as inlet treatment air absolute humidity) Inlet purge air temperature ('C) 30 30 3
0 population purge air flow rate (m/sec) 3 2 1 person purge air absolute humidity (same as artificial treatment air absolute humidity)
As shown in the figure.

As can be seen by comparing Effect A of the invention with Comparative Example B, even if the same amount of regenerated air, the same amount of regenerated heat, that is, the required thermal energy, and the same regenerated wind speed are used, the regenerated air has a uniform temperature of 125°C. 100'C, 125°G, 1
It is better to dehumidify efficiently by using regenerated air at three levels of temperature of 50°G, and to divide the regenerated part of the rotor and gradually heat it to a higher temperature. The dehumidification efficiency is the same as in the case of regeneration (E in Fig. 5), and thermal energy is saved. This is because even if high-temperature regenerated air is suddenly applied to the surface of the small holes in the dehumidifying rotor that have sufficiently adsorbed water vapor in the treated air, all of the heat is desorbed because the flow of hot air inside the small holes is laminar. If the rotor wall surface is dried by the first regeneration hot air during regeneration, high-temperature regeneration air is sequentially introduced. It is thought that the walls of the small through-holes are sequentially heated to high temperatures, the heat is gradually transferred to the deep part, and the thermal energy is effectively used for desorption and regeneration.

Next, as you can see by comparing C, A, and D, all other conditions are the same, and the purge air wind speed is lowered from 3 m/s to 2 m/s to 1 m/s compared to the processing air and regeneration air wind speeds. The dehumidification performance will gradually improve as you go. However, there is a limit in this case, and under the above conditions, if the velocity of the purge air is further lowered to 0.5 m/sec, the performance will deteriorate. Considering the reason for this, purge air is flowed in the purge zone to cool the rotor part that has become hot in the regeneration zone, and in this case, if the flow rate of the purge air is too fast, the cooling effect of the rotor itself will be reduced. However, on the other hand, the water vapor contained in the purge air is adsorbed in the cooled purge zone, resulting in a decrease in dehumidification performance.On the other hand, if the flow rate of the purge air is too slow, the rotor cooling effect is small and the rotor remains at a high temperature. This is because the dehumidification performance in the treatment zone decreases because the dehumidification occurs toward the treatment zone.

The present invention has been explained above using adsorption type dehumidification as an example, but in general, the sorption of gas by a solid sorbent is described in (7) above, including the case of adsorption type dehumidification. It is true that sorption is difficult (desorption reactions tend to proceed), so even in the case of absorption type dehumidification or sorption of gases other than water vapor, by selecting a sorbent suitable for each sorbent gas or a combination thereof, it is possible to completely eliminate sorption. It can be implemented similarly.

As described above, in performing gas sorption by the gas sorption rotor, the present invention divides the heating regeneration zone into two or more parts, and adjusts the inlet regeneration gas temperature in the two or more regeneration zones to successively increase in temperature according to the rotational direction of the rotor. Since each part of the rotor is regenerated at a constant temperature, the thermal energy of the regeneration gas is saved compared to the case where regeneration gas at a single temperature is used.
Furthermore, by changing the flow rate of purge air in the purge zone, it has the effect of further improving dehumidification performance.

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention, FIG. 1 is a front view of the casing 2, FIG. 2 is a perspective view of the rotor showing each zone, FIG. 3 is a developed view of FIG. 2, (8) FIGS. 4 and 5 are graphs showing examples of dehumidification performance. FIG. 6 is a partially cutaway perspective view of a conventional example.

Claims (1)

[Claims] 1. A gas sorption rotor having a large number of small through holes extending from one end surface to the other end surface of a cylinder and in which a gas sorbent appears on the surface of each small hole is rotated. The rotor is configured such that each of its parts sequentially acts as a purge zone, a sorption zone, and two or more regeneration zones, and the temperature of the inlet regeneration gas in the two or more regeneration zones is made sequentially higher. A gas sorption method characterized by regenerating each part. 2. The gas sorption method according to claim 1, wherein the inlet gas wind speed in the purge zone is varied with respect to the inlet gas wind speed in the sorption zone and the regeneration zone. 3. The gas sorption method according to claims 1 and 2, wherein the gas is water vapor. 4. Claim 1 in which the gas sorbent is a gas adsorbent
Gas sorption method according to items 3 to 3.