JP3297140B2 - Rotary 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 an apparatus for separating CO ₂ , NO _x , SO _x, etc. from flue gas after burning fossil fuel by adsorption, and separating and recovering it.

[0002]

2. Description of the Related Art FIG. 4 to FIG.
1 shows a rotary gas recovery device filed by the Japanese Patent Application No. 3-195378. 4, reference numeral 1 denotes a fixed adsorber, 2 denotes a disk-shaped upper rotary valve plate in contact with one end surface of the fixed adsorber 1, and 3 denotes a disk-shaped lower rotary plate in contact with the other end surface of the adsorber 1. With the valve plates, these valve plates 2, 3 are rotated at the same speed by the drive shaft 4. On the upper rotary valve plate 2, a non-rotatable movable disk-shaped valve plate (gas distribution valve plate) 7 to which raw gas and specific gas passing bellows 5, 6 are attached is installed. A preload spring 8 is attached so that one end face of the adsorber 1 in contact with 2 and one end face of the movable non-rotating valve plate (gas distribution valve plate) 7 do not separate.

Similarly, a movable non-rotating valve plate (gas distribution valve plate) 9 which does not rotate to the lower rotary valve plate 3 side, bellows 10 and 11 for passing product gas and purge gas, and a spring 1 for preloading.
2 is attached. The internal structure of the fixed adsorber 1 is provided with a plurality of compartments 13 partitioned in the circumferential direction as shown in FIG. 7 (cross section taken along line GG in FIG. 4), in which the adsorbent 14 is contained. Is filled. The source gas is supplied from a source gas passing bellows 5 to a movable non-rotating valve plate (gas distribution valve plate) 7.
Through the entire circumferential groove 15 for the raw material gas, is guided to the raw gas port 16 penetrating in the thickness direction of the upper rotary valve 2, enters the compartment 13 of the adsorber 1, and is adsorbed by the adsorbent 14 therein. Is adsorbed.

[0004] Next, the specific gas adsorbed by the adsorbent 14 is:
The specific gas port 17 which is detached from the adsorbent 14 by evacuation by a vacuum pump and penetrates in the thickness direction of the upper rotary valve plate 2 and passes through the movable non-rotating valve plate (gas distribution valve plate) 7 for the specific gas. The gas is recovered through the gas passage bellows through the circumferential groove 18. Here, the shapes of the source gas port 16 and the specific gas port 17 provided on the upper rotary valve plate 2 are as follows.
As shown in FIG. 6 (a cross section taken along line F-F in FIG. 4), the partition 13 has a fan shape having a plurality of compartments 13 and extends in the thickness direction. The source gas port 16 and the specific gas port 17 are provided with a phase difference of 180 degrees in the circumferential direction so that the compartment 13 of the adsorber 1 simultaneously receives the supply of the source gas and the evacuation processing of the specific gas. Not to be.

[0005] These ports are also offset in the radial direction, and are located on the outer diameter side of a movable non-rotating valve plate (gas distribution valve plate) 7 shown in FIG. The provided source gas circumferential groove 15 overlaps the source gas port 16 at a radial position, and the specific gas circumferential groove 1 provided on the inner diameter side.
8 overlaps the specific gas port 17 at the radial position. As a result, the gas flowing to the compartment 13 is switched by the rotation of the upper rotary valve plate 2, so that the source gas can be continuously supplied and the specific gas can be recovered. And product gas,
The gas switching mechanism of the lower rotary valve plate 3 and the movable non-rotating valve plate (gas distribution valve plate) 9 through which the purge gas flows is exactly the same as that of the upper rotary plate. The upper rotary valve plate 2
A dead space 26 filled with ceramic balls is provided between the fuel gas and the leading edge of the adsorbent 14 to make the flow rate of the raw material gas uniform.

If the outer and inner radii of the raw material gas ports of the rotary valve plates 2 and 3 are made as close as possible to the outer and inner radii of the adsorber filled with the adsorbent 14, the gas at the leading edge of the adsorbent can be obtained. The flow velocity distribution is made uniform, and the gas separation performance index (adsorbed gas amount) / (total adsorbent amount) can be improved. In the case of the conventional structure, since the rotary valve plate function is realized by offsetting the source gas port 16 and the specific gas port 17 in the radial direction, the inner radius of the source gas port becomes larger than the inner radius of the adsorber. If this is the case, a drift problem will occur in the adsorbent leading edge gas flow. For this reason, as described above, the space 26 is provided between the leading edge of the adsorbent and the valve plate, and measures are taken to create a uniform flow in the space 26. However, since the space 26 is a dead volume, it causes a decrease in concentration at the time of collecting the specific gas and a source gas pressure loss,
It is a problem of the conventional structure to reduce the space 26 and make the gas flow rate at the leading edge of the adsorbent uniform.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a gas flow is made uniform without providing a dead space for making the gas flow uniform in the adsorber as in the conventional apparatus, and the gas pressure loss is reduced and the gas flow is reduced. It is an object of the present invention to provide a rotary gas separation device capable of recovering a gas without reducing its concentration. Another object of the present invention is to provide a rotary gas separation device that improves the sealing performance on the specific gas side, reduces the power consumption of the vacuum pump, and facilitates processing of the rotary valve plate.

[0008]

SUMMARY OF THE INVENTION The present invention provides an adsorber having a plurality of circumferentially partitioned chambers, and a rotary valve plate abutting the adsorber and having a gas inlet port and a gas inlet port. In order to solve the above-mentioned problem in the rotary gas separation device having a rotary valve plate, a port penetrating in the thickness direction is provided on the rotary valve plate.
Conventionally, the other gas port, which is provided so as to penetrate in the thickness direction of the rotary valve plate, is directed from the middle of the thickness of the valve plate toward the outer diameter direction of the valve plate, and penetrates through the outer diameter side cylindrical surface. Gas is made to flow from the outer surface of the rotary valve plate column.
Then, a non-rotating ring having a hole for gas flow is mounted concentrically with the rotary valve plate on the outer diameter portion of the rotary valve plate cylinder. According to this configuration, the inner radius of the gas port provided in the rotary valve plate can be made to match the inner radius of the adsorber.

Further, the present invention provides a rotating apparatus having a structure in which a gas sealing device is provided between the rotary valve plate and the non-rotating ring to prevent gas leakage by sandwiching the second port of the rotary valve plate from above and below. A gas separation apparatus is also provided. As the gas seal device, a magnetic fluid seal device in which a magnetic fluid is sealed and a magnetic field is created between a non-rotating ring and a rotary valve plate to perform gas sealing, or a contact seal device using a carbon ring or the like is used.

[0010]

Since the rotary gas separator according to the present invention employs the above-described structure, the gas can be supplied from one of the non-rotating valve plate and the non-rotating ring and discharged from the other. According to the above configuration, the rotary valve plate is provided with only one port penetrating in the thickness direction, and the other port is provided so as to penetrate toward the outer diameter side cylindrical surface of the rotary valve plate. Because the radius inside the gas port and the radius inside the adsorber that penetrate the rotary valve plate in the thickness direction can be made closer,
The gas flow velocity distribution at the leading edge of the adsorbent is made uniform, so that the dead space between the valve plate and the leading edge of the adsorbent, which has been conventionally provided, is not required, and the problems of lowering the specific gas concentration and the source gas pressure loss are solved.

Further, according to the present invention, a gas seal device is provided between a rotary valve plate and a non-rotating ring to prevent gas leakage by vertically sandwiching a port penetrating toward the outer cylindrical surface of the rotary valve plate. The magnetic fluid seal, which could not be used conventionally because of its structure, can now be used, greatly improving the sealing performance at the port, lowering the specific gas concentration and increasing the load on the vacuum pump (when recovering the specific gas). Vacuum pump power consumption increase) can be avoided. Also,
The processing accuracy (non-rotating valve plate side sliding surface on the gas distribution valve plate side) of the non-rotating valve plate for gas distribution and the rotating valve plate can be reduced by one rank, and the machining cost can be greatly reduced.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a rotary gas separation apparatus according to the present invention.
A specific description will be given based on the embodiment shown in FIGS.
In addition, in FIG. 1 to FIG. 3, the device shown in FIG.
Equivalent parts are given the same reference numerals,
Is omitted. The rotary valve plate 2 in FIG.
Between the rotary valve plate 7 and the end plate 20 attached to the end face of the adsorber 1
And is rotated by the drive shaft 4. The rotary valve plate 2 has an original
Through the gas port 16 through which the feed gas flows in the thickness direction of the valve plate
Processing, radius R in the same port_iAnd outer radius R_OAnd adsorber 1
Inner radius r_i, Outer radius r _oTo match.

The specific gas port 1 on the side opposite to the end plate 20
Reference numeral 7 denotes a port processed in the same size by shifting the phase by 180 degrees in the circumferential direction with respect to the raw material gas port 16, but the outer diameter of the rotary valve plate 2 is about 約 of the thickness of the rotary valve plate 2. The direction of the valve plate 2 is changed so as to penetrate the outer surface of the cylindrical portion of the valve plate 2. For this reason, in the non-rotating valve plate 7 for gas distribution, only the circumferential groove 15 for the source gas is processed, and there is no circumferential groove for the specific gas. The circumferential groove 15 has a plurality of circumferentially extending through-holes 27 in the thickness direction and communicates with the raw material gas supply flexible hose 5. On the other hand, a non-rotating ring 21 is concentrically attached to the outer diameter portion of the rotary valve plate 2 with a gap Cr in the radial direction between the non-rotating ring 21 and the valve plate. A plurality of holes 23 are formed in the ring 21 in the circumferential direction and penetrate in a plurality of positions in the radial direction. A flexible hose 22 for a specific gas connected to a vacuum exhaust pipe is connected to the hole 23.

A magnetic fluid seal is formed over the entire periphery of the gap Cr formed between the outer diameter portion of the rotary valve plate 2 and the non-rotating ring 21 so as to sandwich the outlet 24 of the specific gas port from above and below. Apparatus 28 is mounted. As a result, the specific gas flows from the port 17 through the outlet port 24, through the gap Cr, into the vacuum exhaust pipe through the radial through hole 23 of the non-rotating ring 21 via the flexible hose 22, and is collected. Since the specific gas outlet port 24 is provided only on a part of the outer peripheral surface of the rotary valve plate 2, the hole 2
When the gas is evacuated to 3, the flow resistance increases. For this reason, the problem is solved by providing the circumferential groove 25 in the non-rotating ring 21. When the pressure difference or temperature between the specific gas and the surrounding gas is so high that the magnetic fluid cannot be used, a contact-type sealing device using a carbon ring or the like is used. The lower rotary valve plate side has the same configuration as the above-described upper rotary valve plate 2.

Although the present invention has been described in detail with reference to the illustrated embodiments, the present invention is not limited to these embodiments, and the shape and structure of the present invention are within the scope of the present invention as set forth in the appended claims. It is needless to say that various changes may be made to. For example, in the above embodiment, the port 16 provided in the rotary valve plate 2 is used for the source gas inflow, and the port 24 is configured for the specific gas outlet. The port 24 may be configured for the source gas inflow. In the above embodiment, the gas sealing device 2
Although 8 is provided on the non-rotating ring 21 side, it may be provided on the rotating valve plate 2 side in some cases.

[0016]

As described above in detail, according to the present invention, the continuous gas recovery function of the rotary gas recovery apparatus previously filed by the present applicant in Japanese Patent Application No. 195378/1991 is impaired. In addition, the dead space in the adsorber, which has been a problem to date, can be eliminated, and the problem of lowering the concentration of the recovered specific gas and the pressure loss in the adsorber when supplying the source gas can be solved. Furthermore, the sealing performance on the specific gas side is greatly improved, and the power consumption of the vacuum pump can be reduced. In addition, the machining accuracy of the rotary valve plate (the sliding surface on the gas distribution valve plate side) can be reduced by one rank, and there is an effect that the machining cost can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a source gas side rotary valve plate portion in a rotary gas separation device according to one embodiment of the present invention.

FIG. 2 is a transverse sectional view taken along the line AA of FIG.

FIG. 3 is a transverse sectional view taken along the line BB of FIG. 1;

FIG. 4 is a longitudinal sectional view of a conventional rotary gas separation device.

FIG. 5 is a transverse sectional view taken along the line EE in FIG. 4;

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed adsorber 2 Disk-shaped rotary valve plate 3 Disk-shaped rotary valve plate 4 Drive shaft 5 Bellows (flexible hose) 6 Bellows (flexible hose) 7 Non-rotating valve plate for gas distribution 8 Preload spring 9 Gas distribution Non-rotating valve plate 10 Bellows 11 Bellows 12 Preload spring 13 Compartment room 14 Adsorbent 15 Source gas peripheral groove 16 Source gas port 17 Specific gas port 18 Specific gas peripheral groove 19 Detent pin 20 End Plate 21 Non-rotating ring 22 Flexible hose for specific gas 23 Through hole 24 Specific gas outlet port 25 Circumferential groove 27 Through hole (fixed valve plate for gas distribution) 28 Magnetic fluid sealing device

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiichiro Ogawa 2-5-1 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Heavy Industries, Ltd. (56) References JP-A-63-77516 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) B01D 53/04 B01D 53/06

Claims (2)

(57) [Claims] 1. A rotary gas separation device comprising: an adsorber having a plurality of compartments partitioned in a circumferential direction; and a rotary valve plate in contact with the adsorber and having a gas inflow port and an outflow port. The rotary valve plate has a first port penetrating in the thickness direction and a second port penetrating from the middle of the thickness toward the outer diameter side cylindrical surface, and the first port side for gas flow. A non-rotating valve plate having a hole is provided, and a non-rotating ring having a hole for gas flow is disposed concentrically with the rotating valve plate on the second port side, and the non-rotating valve plate and A rotary gas separator, wherein gas is supplied from one of the non-rotating rings and discharged from the other. 2. A gas seal device is provided between said rotary valve plate and said non-rotating ring to prevent gas leakage by sandwiching said second port of said rotary valve plate from above and below. The rotary gas separation device as described in the above.