JP2999051B2 - Mixed gas separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed gas separation apparatus used for refining / steel making, oxygen-enriched combustion, water / sewage sterilization / purification, pulp bleaching and the like.

[0002]

2. Description of the Related Art PSA which performs gas concentration or separation by utilizing the gas pressure dependence of the amount of gas adsorbed on an adsorbent.
(Pressure Swing Adsorptio
n) In the apparatus, as shown in the gas flow diagram of FIG. 8, pressure increase, production, discharge, adsorption, and inter-column uniformity are performed between the raw material gas supply pump 01, the gas discharge vacuum pump 02, the adsorption tower 03, and the product tank 04. Pressure and other processes are required,
Conventionally, the sequence control has been performed by an electromagnetic valve control type air cylinder driving valve 05 or the like.

FIG. 9 shows a system diagram of the system.
The control air from the solenoid valve 051, which is a pilot valve, is guided to the cylinder drive unit 052, and gives a linear motion to the piston. Next, the valves in the source gas line are opened and closed by the torque transmitted to the para-arm 053 via the pins.

[0004]

The above-mentioned prior art has the following problems. (1) A complicated system including a drive cylinder 05 having a solenoid valve with a controller 06 and a high-pressure air source 07 is required, and air consumption cannot be ignored. (2) For each of the towers 03a, b, c, supply of raw material gas, suction of adsorbed gas, or transfer of pressure equalizing line 08 and product gas to a recirculating compressor or holder, and connection of upper and lower adsorption towers. Multiple independent valves 0 for sequence control
5a1, a2, b1, b2, c1, and c2 are required.

The present invention has a simple structure which does not require a large number of solenoid valves, air cylinder driving valves, an air source and the like.
It is an object of the present invention to provide a mixed gas separation device utilizing pressure fluctuation.

[0006]

SUMMARY OF THE INVENTION A set of three motor-driven rotary control valves having the following configuration is provided. Partial grooves are provided on the circumference of each rotary valve, and the angle is set and pressurized so that the first valve corresponds to the pressurizing / adsorbing process, the second valve corresponds to the manufacturing process, and the third valve corresponds to the depressurizing / regenerating process. .

Further, on the circumference of each rotary valve, another full circumferential groove is provided, which is connected to a partial groove by a communication passage.

[0008]

The partial groove of the first valve communicates with a valve port connected to a raw material supply compressor, the second valve partial groove communicates with a valve port connected to a product tank, and a third valve.
The partial groove of the valve communicates with a valve port connected to a vacuum pump for exhaust / regeneration. Further, for all valves, their entire circumferential grooves communicate with valve ports that connect to the adsorption tower.

These three valves are connected by one shaft,
By simply rotating the drive motor, it can be controlled to match the PSA operation cycle.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a gas flow diagram of an embodiment of the present invention in a two-column PSA facility. The present device comprises valve bodies 1a, 1b, 1c and seats 2a, 2b, 2 respectively.
c, three rotary valves 10a, 10b, 1
It is composed of a control valve 100 including a combination of Oc and the drive motor 3, a blower 4, a vacuum pump 5, a first adsorption tower 6, a second adsorption tower 7, and a product tank 8.

FIG. 2 and FIG. 3 (expanded views of a rotary valve),
As shown in FIGS. 4 to 8 (assembly drawings of the rotary valve), two circumferential grooves are provided on the outer periphery of the cone-shaped valve body 1. The groove 11 on the left side (large diameter) of the cone is a partial circumferential groove having an angle of about half of the entire circumference of the cone,
The groove 12 on the right side (small diameter) of the cone is a circumferential groove (see FIG. 2). The two grooves are connected by a communication hole 13 formed in the center of the valve.

On the other hand, the seat 2 on the housing side facing the valve body is provided with a groove on the left side of the cone (large diameter).
Ports 21 and 22 are provided at 80 ° symmetrical positions (see FIG. 3), and the groove on the cone overlaps with one of the ports. The ports 21 and 22 are connected to the first adsorption tower 6 or the second adsorption tower 7, respectively. The entire circumferential groove 12 on the right side (small diameter) of the cone always overlaps with the port 23 on the seat on the housing side, and the port 23 is connected to the blower 4.

[0013] The rotary valve group includes the first to third stages.
It consists of the rotary valves 10a, 10b, 10c. The structure of the first-stage rotary valve 10a is as shown in FIG. 3 described above. Second stage rotary valve 10
b also has exactly the same shape and phase as the first stage rotary valve 10a. However, the port 23 is the product tank 8
The only difference is that it is connected to.

The third stage rotary valve 10c also has the same shape as the former two, but as shown in FIG.
The difference is that it is shifted by 0 ° and the port B is connected to the vacuum pump 5. As can be seen from the relationship between the valve opening / closing state of each stage and the valve rotation angle shown in FIG. 1, θ = −18.
Between 0 ° and 0 °, product oxygen is produced in the first adsorption tower 6, and the second adsorption tower 7 is in a regeneration step. θ = 0 ° to 180
Conversely, oxygen production is performed via the second adsorption tower 7 and the first adsorption tower 6 shifts to a regeneration step. Therefore, according to this sequence cycle, product oxygen is always generated.

In the above embodiment, a conical valve body is used. However, a cylindrical valve body can also be controlled by providing similar partial circumferential grooves and full circumferential grooves on the circumference. It is. In addition, by connecting a series of three rotary valve groups in a coaxial manner and driving them, a large number of adsorption towers (number of towers: 4, 6, 8) can be controlled.

[0016]

According to the present invention, there is provided a mixed gas separation apparatus comprising: a valve body having a partial circumferential groove and a full circumferential groove on an outer peripheral surface and a communication hole therein for communicating the two grooves; Three rotary valves, each of which is airtightly surrounded and has a port having an opening in each groove, are connected so as to rotate integrally, and the port opening in the partial circumferential groove of the first rotary valve is connected to the adsorption tower. To the gas supply blower, the port opening to the partial circumferential groove of the second rotary valve to the adsorption tower, and the port opening to the entire circumferential groove to the product tank. And the port opening in the partial circumferential groove of the third rotary valve is connected to the adsorption tower, and the port opening in the entire circumferential groove is connected to the vacuum pump for gas discharge. . (1) Each step of PSA adsorption, production, and regeneration can be controlled by a rotary valve that rotates integrally, and the following effects are brought about with respect to a conventional PSA. (2) A controller, a pressure air source for a drive cylinder, and the like, which are necessary for controlling the solenoid valve, are not required, and the number of parts can be reduced and the system can be simplified. (3) Further, the cycle time can be reduced, and the size of the adsorption tower can be reduced, and the size of the entire PSA device can be reduced. (4) As a result, it is possible to improve reliability, maintainability, reduce equipment costs, and the like.

[Brief description of the drawings]

FIG. 1 is a gas flow diagram according to an embodiment of the present invention.

FIG. 2 is a development view of a valve body of the rotary valve shown in FIG.

FIG. 3 is a development view of a sheet corresponding to FIG. 2;

FIG. 4 is a longitudinal sectional view of the rotary valve group shown in FIG.

FIG. 5 is a sectional view taken along line aa of FIG. 4;

FIG. 6 is a sectional view taken along line bb of FIG. 4;

FIG. 7 is a sectional view taken along the line cc of FIG. 4;

FIG. 8 is a gas flow diagram in a conventional PSA device.

FIG. 9 is a control valve cycle diagram in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve body 2 Seat 4 Gas supply blower 5 Gas exhaust vacuum pump 6 First adsorption tower 7 Second adsorption tower 8 Product tank 10 Rotary valve 11 Partial circumferential groove 12 Full circumferential groove

Claims (1)

(57) [Claims] An outer peripheral surface having a partial circumferential groove and an entire circumferential groove;
Three rotary valves including a valve body having a communication hole for communicating the two grooves therein and a seat having a port open to each groove and hermetically surrounding the valve body are integrally rotated. And a port that opens to a partial circumferential groove of the first rotary valve is connected to the adsorption tower, a port that opens to the entire circumferential groove is connected to the gas supply blower, and a partial circumferential groove of the second rotary valve is connected. The port that opens to the suction tower communicates with the adsorption tower, the port that opens to the entire circumference groove communicates with the product tank, the port that opens to the partial circumference groove of the third rotary valve communicates with the adsorption tower, and the A mixed gas separation device, wherein an opening port is communicated with a gas discharge vacuum pump.