JPS6186925A - Method and apparatus for dehumidifying compressed air by non-heating regeneration method - Google Patents

Abstract

PURPOSE:To conserve energy and to economically construct an apparatus, by always measuring the dew point of dry air by a dew point sensor and simultaneously performing the dehumidification of compressed air in all of plural adsorbing towers for a considerable period at the point of time when the dew point was fallen to a first predetermined one. CONSTITUTION:Left and right adsorbing towers 1, 11 according to a cycle system are alternately operated and, when the dew point of dry air at a dry air outlet 20 reached a first predetermined dew point (e.g., -60 deg.C), the left and right adsorbing towers 1, 11 are allowed to simultaneously perform the dehymidification of air on the basis of the signal from a dew point sensor 10 always measuring the dew point of the aforementioned dry air. Subsequently, when the dew point of dry air reached a second predetermined dew point (e.g., -40 deg.C), both adsorbing towers 1, 11 are returned to the cyclic system by the signal of the aforementioned sensor 10. Further, when the dew point of dry air reached the aforementioned first dew point, the left and right adsorbing towers 1, 11 are allowed to again simultaneously perform the dehumidification of air. As a result, energy is conserved and an apparatus can be economically constructed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for dehumidifying pressurized air using a non-forceful heat regeneration method and a dehumidifying device therefor.

Problems with the Prior Art In the conventional method of dehumidifying pressurized air using a non-heating regeneration method, for example, there are problems with the conventional technology. As disclosed in the publication, the adsorption process (dehumidification process of pressurized air) and vacuum regeneration process (process of regenerating the desiccant under reduced pressure) are performed alternately in a pair of adsorption towers every few minutes. ), and the amount of nitrogen gas in the barge (to dispose of waste) during this depressurization and re-entry is /J%~/7 of the inlet compressed air amount.
Almost % was consumed.

In addition, when moving from the second adsorption step to the reduced pressure regeneration step, the air accumulated in the adsorption base was discharged, resulting in a huge energy loss. This nine methods for regeneration had a major drawback.

For this reason, we have tried various methods to reduce our losses, but unfortunately we have not achieved a good method.
Purpose of the Invention #3 is to solve the above-mentioned conventional problems (proposed). The purpose is to obtain a device that is easy to handle and operates properly.

The structure of the invention is to provide a plurality of adsorption towers 111α11, and dehumidify the nitrogen pressure at the edge of the -1 adsorption tower +11 for every cycle time of a certain PJT leg, while at the same time dehumidifying the other adsorption tower i1] ), the adsorbent is dried and regenerated under reduced pressure to reduce the purge exhaust valve force and
After starting the process of discharging used air from dry air, the dew point of the dried air is constantly measured using a dew point sensor αO, and the first predetermined dew point (e.g. -booc
), the signal from the i-point sensor αα simultaneously opens the respective air intake valves (61σbl) to the plurality of adsorption towers +1 11′, and at the same time opens the purge exhaust valve +71 (171191 (19i As a closed system, a plurality of adsorption towers 111 (111''C) simultaneously dehumidify the pressurized air for a considerable period of time (this period is referred to as an energy-saving key operation period), and this energy-saving operation lowers the central dew point of the dry air. When the temperature rises to the second predetermined dew point (for example, -ao"c) K, the plurality of adsorption towers are activated by a signal from the dew point sensor αa).
Air injection into only one adsorption tower 11+ 09P16
1 open 5- and air population valve σ6 to the other adsorption tower αυ
+ is closed, and at the same time, the other adsorption tower (IIIpl etc. purge exhaust 9Pα71α9 is opened and one adsorption tower il
l T is dehumidification in the other adsorption tower (111), and drying and re-drying of the adsorbent are repeated alternately, and after a certain period of time, the dew point of the dried gold that has been dried again is A dehumidifying device for controlling the plurality of suction valves again when the dew point of the first 915FI falls to the constant dew point of the first 915 FI, the dehumidifying device is for the purpose of controlling the plurality of suction valves again, from the adsorption tower +11 (11). a sensor Gα that detects the dew point of the dry air that has been dried; a dew meter 4 that generates an output electrical signal corresponding to the NFCI point sensed by the sensor CI (I); and an output electrical signal from the dew point meter A comparison circuit 1 for comparing the set electric signal of WT and a set electric signal of
1 Heno air valve +61115 Exhaust valve for topurge (7
1(171+91(t!J)) is a dehumidifying device for pressurized air by switching t!

EXAMPLE 1 The present invention will be illustrated. -LOL Explained by mflll.

In the figure, there is a pair of left and right adsorption towers filled with adsorbents such as activated alumina and synthetic zeolite. (Connected to the outlet vibrator Qz to the dry air outlet ■ via 31α3, the output vibrator &21, -
Regeneration amount airflow I/adjustment diaphragm C! Connect the bypass with Φ, and
is the said pipe (21) via the check valve 141 (141).
Connected to tia. 151 (151 is a pipe provided in communication with the lower part of the adsorption tower 11+ (ull), and the pipe +51 (151 fl,
l 1m 9P 161 u61 k Moisturized pressurized air-immunization port c! 11 and an exhaust solenoid valve 17
1 (The above-mentioned noise reduction device that connects to J Diplomatic through 171 is a device that uses the conventional pressurized all-party dehumidification method using the non-heating regeneration method, and is operated by commands from the control panel c301.
, the first stage (air inlet t8* to the second left adsorption tower 111
Only 161 is open.For moist pressurized nitrogen, air inlet 1 magnetic valve (
6), the left adsorption tower fil K is dehumidified and then exits through the check valve (31) through the dry air outlet. The second step is to slowly pass through the adsorption tower (see Figure 2 B y@), and then open the magnetic valve α71 for exhaust gas.
Approximately 7.2% of the dry air released from ) is recycled airflow tv@squeezing valve c! 41 weight approx. 0.2kg4"
The pressure is reduced to below G and enters the adsorption tower on the right), and the wet adsorbent in the adsorption tower αυ is regenerated and dried. valve l
to outside air (small (flJ is less than 10%)).

The pre-exhaust valve σ9 is for the purpose of reducing the impact and mitigation when the residual height 2 of the adsorption tower aIJ is discharged/reduced by -2.

In the third stage, the air is dehumidified in the left adsorption tower (111) and at the same time, the adsorbent is regenerated and dried in the right adsorption tower (111). That is, after the regeneration and drying of the adsorbent in the right adsorption tower flJ is completed (actually after about S minutes), the control panel C30
Solenoid valves σ′n and c! are activated by commands from 1! 1 and +61 are closed and t magnetic valve σe is opened to introduce moist pressurized air into the stone @ scouring tower (111) and dehumidify the air. Reduced pressure air (approximately 9% of the dry air coming out of the adsorption tower CI+) was introduced and the suction amount was 8.
sake). At this time, set the pre-exhaust hexagonal valve f91 to
It is opened in advance before the opening of +71, and then the third stage and the fourth stage are repeated alternately.It is a f5fi cycle type system.

Inventively, the left and right adsorption towers are operated alternately according to the above-mentioned cycle type system, so that the dew point of the drying air at the drying outlet is as high as the above-mentioned 1 μoOc. When reaching a low predetermined stall (e.g. -t,,ooc),
The dry air KA sensor 1a is fed back to the left and right air inlet solenoid valves 161061 for introducing moist air into the left and right adsorption towers i1+ (Ill).
At the same time as opening the left and right exhaust solenoid valves 171 (17
1 and pre-exhaust solenoid valve t91 (with I'll closed, E8 in Fig. 2), the left and right adsorption towers ft+ (L12) are simultaneously subjected to sudden dehumidification. (This period is considered as the energy-saving operation period. ) During this period, when the voltage inside the unused purge air reaches a predetermined voltage, the state shown in Fig. F changes.

In the invention, a very small amount of the air from the dry air outlet ■ is applied to the sensor (101) and the dew point meter (
A signal cylinder R of fc1M pressure (the third must be seen) is generated in response to the ginseng bite detected by the sensor +10 from the sensor +10. At the time of fc, the comparator circuit outputs a command signal from the I51 wall, which is amplified and the control panel C311 is operated to achieve the energy saving. During this period, the dry regeneration of the adsorbent is not stopped, and the dew point of the dry air at the dry air outlet (■) gradually rises, but the dew point of the dry air at the dry air outlet (■) rises gradually. When the point (for example -aooc) is reached, the signal is fed back from the dry air jlA sensor [101], and the conventional third and fourth stages are alternately repeated. When the drying air at the drying outlet reaches the dew point or oil dew point (for example -bO'c), air is again supplied to the left and right adsorption towers H1 (111) at the same time. Perform dehumidification,
One magnetic valve is opened and closed so that the purge air t becomes zero.

When starting this energy-saving operation sound, actually the f @ number stage shown in Fig. 2
), a required specified signal is output from the comparison circuit ω, which activates the control panel ω to stop the energy saving operation, complete the conventional cycle type operation, and restart the dry air drying process again. The cycle-type operation is performed until the critical dew point (for example, -bo''c) is reached, and when the Pfian point is reached, the operation is switched to energy-saving operation.

In addition, in the third diagram, the horizontal axis shows the dew point (-ko OQC to -g).
A ``dew point-voltage graph'' is displayed by taking the voltage (mV) generated as an output electric signal from the dew point meter on the vertical axis. Dew point is 16o0c
The corresponding voltage when is JJmV, and the corresponding voltage when -uooc is ij6! mV is shown in this graph.

Drainage: Diagram A%B, C%E%F are the first, second, third, and fourth stages, the preparation stage for preparing for energy-saving operation, and the VC failure during energy-saving operation, respectively. A demonstration of opening and closing a solenoid valve! The flow of incoming air, as well as the pressure inside the left and right adsorption towers (
pressure as an example).

FIG. 4 shows a front view of a dehumidifying machine embodying the present invention,
FIG. 5 is a circuit diagram used in the device of the present invention.

In Figure 4, cl! 91a, and the changeover switch 1 shown in FIG.
2! The circuit and the dew point gauge 1 are connected so that Il+ almost faintly contacts the terminal c3υ side to achieve energy-saving operation. When the changeover switch □□□ comes into contact with the terminal C2 side, the monitor is activated. At this time, the voltage VB+ for generating the monitor adjustment voltage shown in Figure 4 is activated.
Operate the adjustment volume control and set the above-mentioned first dew point (e.g. -1, O"C) and second dew point (e.g. -4 !00C) should be generated to detect the set voltage.Start of energy-saving operation VR2I#i Adjustment volume (to) and end of energy-saving operation V
R3 Theory Volicum c37) flavor! It is something that does I.

The present invention has a configuration like the previous ac, in which the atmospheric equivalent dew point of the dry air that has been dried is constantly measured by a dew point sensor σα in the treatment process of the dehumidification method for pressurized air using a non-heating regeneration method. When the dew drops to the first predetermined dew point (11s O'C), the signal from the IIA sensor turns on the 9 air inlet valves to each of the plurality of adsorption towers 111 (Fll + 611161). By simultaneously opening the purge exhaust valve (71αη (91α9) and closing the purge exhaust valve (71αη) at the same time, multiple adsorption towers!11 (111) dehumidify the pressurized air at the same time for a considerable period of time. This saves significant energy. It is possible to save money, and the manufacturing cost of the device is M: 65%, and it has great features such as easy handling.

[Brief explanation of the drawing]

The drawings are for explaining an embodiment of the method of dehumidifying pressurized air by the non-thermal regeneration method and the dehumidifying device thereof according to the present invention, and FIG. 1 is a configuration diagram showing the configuration thereof, FIG. B, C, D, E, and F are the operating sequence diagram of the device shown in Figure 1 above, and Figure 3 shows the atmospheric equivalent dew point detected by the sensor at the stop and the output from the dew point meter. The graph showing the relationship between the signal voltage (mV) and the voltage (mV) in Figure 4 shows a dehumidifying machine embodying the present invention. Figure 5 shows an example of a circuit diagram used in the invention. 111+I11 are the left and right adsorption towers+21 Fil el! 21 Lri pipe (4 pipes) (
3114+σ3 (141 is check valve +51 (151 is pipe (conduit) Outlets C, !D are moist pressure air inlet 0 is connection C!! 41 is regenerated air! Adjustment throttle valve C! 51 is bypass 17! till dew point meter C17+ciσ comparison circuit cit is amplifier Switch 1 #Adjustment = = Control panel Gl) (3 power is terminal (331 is VRI leg adjustment example (to) lamp (361 is VR2 adjustment volume C37) 11 vRs adjustment home 17 '7 Departure
Akira Nagisa Nakano Yoshi 9th grade
Tadashi Sato Ten% Kei Application 8 BFF Gyo Co., Ltd. Agent Patent Attorney Satoshi Karami Procedural Amendment (Voluntary) January 26, 1980 Commissioner of the Patent Office Manabu Shiga 1, Indication of Case 1988 Patent Application No. 2062A5 2 Invention No title. It's the PhM% method. IEq
KIBF Industry Co., Ltd. 4, Agent 5, Date of amendment order Showa, Month, Day 6, Target of amendment: Overpressure drawing 7 Contents of amendment as attached.

Claims (2)

[Claims] (1) A plurality of adsorption towers are provided, and at each predetermined cycle time, one adsorption tower dehumidifies pressurized air while the other adsorption tower regenerates the adsorbent by drying with reduced pressure dry air. In the middle of the treatment process of a pressurized air dehumidification method using a non-thermal regeneration method (low-pressure regeneration method) in which used air is discharged from a purge exhaust valve alternately between multiple adsorption towers, The dew point of the dried air that has been dried is constantly measured by a dew point sensor, and when the dew point drops to a first predetermined dew point, the air inlet valves to the plurality of adsorption towers are opened using a signal from the dew point sensor. At the same time, the purge exhaust valve is closed to dehumidify the pressurized air in all the adsorption towers at the same time for a considerable period of time, and after a considerable period of time, the dew point of the dry air reaches a second predetermined dew point that is higher than the first predetermined dew point. When the dew point rises to this point, the air inlet valve to only one of the plurality of adsorption towers is left open, and the air inlet valve to the other adsorption tower is closed at the same time, based on a signal from the dew point sensor. By opening the purge exhaust valve from the other adsorption tower, one adsorption tower performs dehumidification, and the other adsorption tower performs drying and regeneration of the adsorbent, and after a certain period of time, the dew point of the dry air that has been dried again is According to the non-thermal regeneration method, the valve is controlled to perform the dehumidification process in the plurality of adsorption towers simultaneously when the dehumidification temperature drops to the first predetermined dew point. How to dehumidify pressurized air (2) A dehumidifying device for carrying out the method of dehumidifying pressurized air by the non-heating regeneration method according to claim 1, comprising:
A sensor that detects the dew point of dried air that has been dried from an adsorption tower, a dew point meter that generates an output electrical signal corresponding to the dew point detected by the sensor, and an output electrical signal from the dew point meter and a predetermined setting. a comparison circuit that compares the electric signal with the electric signal; and a control panel that uses the signal from the comparison circuit to switch the air inlet valves to the plurality of adsorption towers and the purge exhaust valves to predetermined open or closed states, respectively. A dehumidifying device for pressurized air using a non-heating regeneration method, characterized by being equipped with