Residual gas purification device for liquefied natural gas

Abstract

The utility model discloses a liquefied natural gas residual gas purification device which comprises a supporting frame and an adsorbent, the supporting frame is used for being fixed on the inner wall of a purification tower, the supporting frame is of a hollow cuboid structure, a connecting cylinder is fixed at the inner bottom of the supporting frame, a filter cylinder is fixed at the bottom of the connecting cylinder, and the adsorbent is arranged in the filter cylinder. And the inner bottom of the filter cartridge is rotationally connected with a first rotating shaft. Compared with the prior art, the device has the advantages that the adsorbent is arranged in the filter cylinder, when the device is used, gasified liquefied natural gas enters the device through the filter cylinder, is filtered by the adsorbent and then is discharged by the filter screen, and in the using process, the liquefied natural gas is fed into the device through the motor, the second rotating shaft, the feeding screw rod, the first rotating shaft and the stirring frame; and the feeding screw rod is matched with the fixed cylinder to stir the adsorbent at the bottom to the top, so that the adsorbent is uniformly utilized, and the use cost is greatly saved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas waste gas purification, in particular to a liquefied natural gas waste gas purification device. Background Art

[0002] During the production, storage and transportation of LNG, some impurities may be present, such as water vapor, nitrogen and light hydrocarbons. These impurities will affect the quality and safety of LNG. Through residual gas purification, these impurities can be removed to improve the purity and safety of LNG.

[0003] When purifying traditional liquefied natural gas, the liquefied natural gas is passed into a purification tower and converted into gas by heating or pressurizing. The gaseous liquefied natural gas is purified by adsorbent in the adsorption tower. However, the gaseous liquefied natural gas is processed by adsorbent from bottom to top, and the bottom adsorbent and the top adsorbent in the adsorption box are not used evenly, which leads to a waste of adsorbent in actual use. There are certain deficiencies in its use. For this reason, we propose a liquefied natural gas waste gas purification device. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a liquefied natural gas residual gas purification device.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A liquefied natural gas waste gas purification device comprises a support frame and an adsorbent, the support frame is used to be fixed on the inner wall of a purification tower, the support frame is a hollow rectangular structure, a connecting cylinder is fixed to the inner bottom of the support frame, a filter cartridge is fixed to the bottom of the connecting cylinder, the inner bottom of the filter cartridge is rotatably connected to a first rotating shaft, both of the first rotating shafts are equipped with stirring frames, a cover plate is installed on the top of the connecting cylinder by bolts, a filter screen is installed on the cover plate, a motor is installed on the top of the cover plate, a fixed cylinder is installed on the bottom of the cover plate, an output shaft of the motor passes through the cover plate and is connected to a second rotating shaft, the second rotating shaft is inserted into the interior of the fixed cylinder and is connected to a feeding screw, the feeding screw is connected to the first rotating shaft by a spline, and an adsorbent is arranged inside the filter cartridge.

[0007] Preferably, the stirring frame is an L-shaped structure, and a cross bar is fixed to the side of the stirring frame.

[0008] Preferably, the number of the stirring racks is at least two groups, and the two groups of stirring racks are symmetrically distributed on the sides of the first rotating shaft.

[0009] Preferably, the number of the filter screens is several groups, and the several groups of filter screens are located on the top of the cover plate and distributed in a circular array.

[0010] Preferably, a side surface of the fixed cylinder is provided with through holes, the number of the through holes is at least two groups, and the feeding screw is rotatably connected to the fixed cylinder.

[0011] Preferably, the adsorbent is located inside the filter cartridge.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model arranges an adsorbent inside the filter cartridge. When the device is in use, gasified liquefied natural gas enters the device through the filter cartridge, is filtered by the adsorbent and then discharged from the filter screen. During use, the adsorbent in the filter cartridge is stirred by a motor, a second rotating shaft, a feeding screw, a first rotating shaft and a stirring frame. The feeding screw cooperates with the fixed cylinder to stir the adsorbent at the bottom to the top, so that the adsorbent is evenly used, which greatly saves the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an isometric view of a liquefied natural gas waste gas purification device proposed by the utility model;

[0015] Figure 2 for Figure 1 A front cross-sectional view of

[0016] Figure 3 for Figure 2 Axonometric view of the center fixed cylinder.

[0017] In the figure: 1 support frame, 2 connecting cylinder, 3 filter cylinder, 4 first rotating shaft, 5 stirring frame, 6 cover plate, 7 filter screen, 8 motor, 9 second rotating shaft, 10 fixed cylinder, 11 feeding screw, 12 adsorbent. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] Reference Figure 1-3A liquefied natural gas residual gas purification device comprises a support frame 1 and an adsorbent 12. The support frame 1 is used to be fixed on the inner wall of the purification tower. The support frame 1 is a hollow rectangular parallelepiped structure. A connecting cylinder 2 is fixed to the inner bottom of the support frame 1. A filter cartridge 3 is fixed to the bottom of the connecting cylinder 2. The inner bottom of the filter cartridge 3 is rotatably connected to a first rotating shaft 4. Both ends of the first rotating shaft 4 are equipped with stirring frames 5. The stirring frames 5 are L-shaped structures. A cross bar is fixed to the side of the stirring frames 5. The number of stirring frames 5 is at least two groups. The two groups of stirring frames 5 are symmetrically distributed on the side of the first rotating shaft 4. A cover plate 6 is installed on the top of the connecting cylinder 2 by bolts. A filter screen 7 is installed on the cover plate 6. The number of the filter screen 7 is several groups. The several groups of filter screens 7 are located on the top of the cover plate 6 and are distributed in a circular array. A motor 8 is installed on the top of the cover plate 6. A fixing cylinder 10 is installed on the bottom of the cover plate 6. The motor 8 The output shaft passes through the cover plate 6 and is connected to the second rotating shaft 9. The second rotating shaft 9 is inserted into the interior of the fixed cylinder 10 and is connected to the feeding screw 11. A through hole is opened on the side of the fixed cylinder 10, and the number of through holes is at least two groups. The feeding screw 11 is rotatably connected to the fixed cylinder 10. The feeding screw 11 is connected to the first rotating shaft 4 by a spline. An adsorbent is arranged inside the filter cylinder 3. The adsorbent 12 is located inside the filter cylinder 3. By arranging the adsorbent inside the filter cylinder, when the device is used, the gasified liquefied natural gas enters the device through the filter cylinder, is filtered by the adsorbent, and is discharged from the filter screen. During use, the adsorbent in the filter cylinder is stirred by the motor, the second rotating shaft, the feeding screw, the first rotating shaft and the stirring frame. The feeding screw cooperates with the fixed cylinder to stir the adsorbent at the bottom to the top, so that the adsorbent is evenly utilized, which greatly saves the use cost.

[0020] When in use, the device is fixed on the inner wall of the adsorption tower through the support frame 1, the device is connected to the power supply, and the motor 8 is started. The output shaft of the motor 8 drives the second rotating shaft 9 to rotate, and the second rotating shaft 9 drives the feeding screw 11 to rotate, and the feeding screw 11 drives the first rotating shaft 4 to rotate, and the first rotating shaft 4 drives the stirring frame 5 to rotate, and the stirring frame 5 stirs the adsorbent. At this time, the feeding screw 11 cooperates with the fixed cylinder 10 to lift the adsorbent at the bottom through the fixed cylinder 10, and discharges it to the top of the adsorbent through the top through hole of the fixed cylinder 10. During use, the gasified liquefied natural gas enters the device through the bottom of the filter cylinder 3, and after the adsorption is completed by the adsorbent 12, it is discharged from the top filter screen 7. At this time, by stirring the adsorbent 12, it can effectively and stably ensure that the adsorbent adsorbs the natural gas evenly, improve the utilization rate of the adsorbent 12, and greatly save the cost of use.

[0021] To sum up, compared with the prior art, the utility model arranges the adsorbent inside the filter cartridge. When the device is in use, the gasified liquefied natural gas enters the device through the filter cartridge, is filtered by the adsorbent and then discharged from the filter screen. During use, the adsorbent in the filter cartridge is stirred by the motor, the second rotating shaft, the feeding screw, the first rotating shaft and the stirring frame. The feeding screw cooperates with the fixed cylinder to stir the adsorbent at the bottom to the top, so that the adsorbent is evenly utilized, which greatly saves the use cost.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A liquefied natural gas waste gas purification device, comprising a support frame (1) and an adsorbent (12), characterized in that: The support frame (1) is used to be fixed on the inner wall of the purification tower. The support frame (1) is a hollow rectangular parallelepiped structure. A connecting cylinder (2) is fixed to the inner bottom of the support frame (1). A filter cylinder (3) is fixed to the bottom of the connecting cylinder (2). The inner bottom of the filter cylinder (3) is rotatably connected to a first rotating shaft (4). Both of the first rotating shafts (4) are equipped with stirring frames (5). A cover plate (6) is installed on the top of the connecting cylinder (2) by bolts. A filter screen (7) is installed on the cover plate (6). A motor (8) is installed on the top of the cover plate (6). A fixed cylinder (10) is installed on the bottom of the cover plate (6). The output shaft of the motor (8) passes through the cover plate (6) and is connected to a second rotating shaft (9). The second rotating shaft (9) is inserted into the interior of the fixed cylinder (10) and is connected to a feeding screw (11). The feeding screw (11) is connected to the first rotating shaft (4) by a spline. An adsorbent is arranged inside the filter cylinder (3).

2. A liquefied natural gas waste gas purification device according to claim 1, characterized in that: The stirring frame (5) is an L-shaped structure, and a cross bar is fixed on the side of the stirring frame (5).

3. A liquefied natural gas waste gas purification device according to claim 1, characterized in that: The number of the stirring racks (5) is at least two groups, and the two groups of stirring racks (5) are symmetrically distributed on the side of the first rotating shaft (4).

4. A liquefied natural gas waste gas purification device according to claim 1, characterized in that: The number of the filter screens (7) is several groups, and the several groups of filter screens (7) are located on the top of the cover plate (6) and are distributed in a circular array.

5. A liquefied natural gas waste gas purification device according to claim 1, characterized in that: The side surface of the fixed cylinder (10) is provided with through holes, and the number of the through holes is at least two groups. The feeding screw (11) is rotatably connected to the fixed cylinder (10).

6. A liquefied natural gas waste gas purification device according to claim 1, characterized in that: The adsorbent (12) is located inside the filter cartridge (3).

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