Replacement tail gas recovery device

Abstract

The utility model relates to the technical field of replacement tail gas recovery, in particular to a replacement tail gas recovery device which comprises a first gas conveying pipeline, a flow meter arranged on the outer side of the first gas conveying pipeline and used for monitoring the flow of internal gas and a regulating valve used for regulating the gas conveying amount, and a replacement tail gas buffer tank is arranged on the outer side of the first gas conveying pipeline; according to the utility model, crude hydrogen (with the hydrogen content of 95-98%) is introduced to a first-section outlet of PSA-H2, and is controlled to enter the CO replacement tail gas buffer tank through the first gas pipeline, the flowmeter and the regulating valve to be mixed with PSA-CO replacement tail gas, so that the H2 content reaches 45%, the medium composition is improved, and the medium molecular weight is reduced, thereby ensuring the normal and stable operation of a CO replacement tail gas compressor, and ensuring the normal and stable operation of the CO replacement tail gas compressor. Replacement tail gas is effectively recycled, the CO and H2 product gas amount is increased, the replacement tail gas buffer tank can be rapidly moved to the designated position through the moving wheels, after the moving wheels reach the designated position, the moving wheels are stored in the supporting base, and the replacement tail gas buffer tank is supported and fixed through the supporting base.

Description

Technical Field

[0001] The utility model relates to the technical field of replacement tail gas recovery, in particular to a replacement tail gas recovery device. Background Technique

[0002] H2, LPG and C5 are important chemical raw materials. The H2 product is a precious resource in petroleum refining enterprises and plays an important role in both gasoline hydrogenation and diesel hydrogenation processes. Most of the hydrogen in petroleum refining enterprises is obtained through PSA. The PSA replacement tail gas contains a large amount of H2 and CO gases. To recycle this part of the gas, it needs to be pressurized by a replacement tail gas compressor and sent back to the PSA inlet for recycling. The original designed values of the replacement tail gas gas components are: H2 content 45%, CO content 25%, and N2 content 30%.

[0003] In the actual production process, the H2 content in the replacement tail gas is only 27.00%. Due to the low hydrogen content in the gas components, the replacement tail gas compressor runs with an overrated current, and the bearing temperature and the outlet gas temperature are high, so it cannot run for a long time. As a result, the PSA replacement tail gas cannot be recycled, the amounts of CO and H2 product gases are reduced, and the production cost is increased. The buffer tank is mainly used to buffer the pressure fluctuations in the system and make the system work more smoothly. At present, when the buffer tank leaves the factory, a hoisting machine is needed to hoist the buffer tank onto the mounting seat for installation. Since the hoisting machine occupies a large area and takes up a lot of space when in use, and the cost is high, the production cost is thus increased. Content of the Utility Model

[0004] The purpose of the utility model is to provide a replacement tail gas recovery device to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A replacement tail gas recovery device includes a first gas transmission pipeline, and further includes:

[0006] A flow meter for monitoring the flow rate of the internal gas and a regulating valve for regulating the gas transmission volume are arranged on the outer side of the first gas transmission pipeline, and a replacement tail gas buffer tank is arranged on the outer side of the first gas transmission pipeline;

[0007] A second gas transmission pipeline installed on the outer side of the replacement tail gas buffer tank, and a replacement tail gas compressor is arranged at one end of the second gas transmission pipeline away from the replacement tail gas buffer tank;

[0008] Three support seats arranged in an annular array at the bottom of the replacement tail gas buffer tank, a moving wheel is arranged inside the support seat, and an adjusting component for unfolding and storing the moving wheel is arranged inside the support seat.

[0009] Preferably, both the flow meter and the regulating valve are installed on the outer side of the first gas transmission pipeline through flange plates.

[0010] Preferably, a control valve is provided on the outer side of the second gas transmission pipeline.

[0011] Preferably, two symmetrical lifting lugs are provided on the top of the replacement tail gas buffer tank, and a buckle plate is provided on the outer side of the replacement tail gas buffer tank.

[0012] Preferably, the adjusting assembly includes a hydraulic rod disposed inside the support base. A connecting seat is provided on the piston rod of the hydraulic rod. A first connecting rod is provided on the outer side of the connecting seat. A second connecting rod is provided on the outer side of the first connecting rod. A limiting rod is provided on the outer side of the second connecting rod.

[0013] Preferably, an installation frame is provided on the outer side of the second connecting rod, and a moving wheel is provided inside the installation frame.

[0014] Preferably, support rods are provided on the outer sides of both the hydraulic rod and the first connecting rod.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] The present utility model introduces the crude hydrogen gas at the outlet of the first stage of PSA-H2 (hydrogen content 95-98%). The crude hydrogen gas enters the CO replacement tail gas buffer tank through the first gas transmission pipeline, flowmeter and regulating valve, and is mixed with the PSA-CO replacement tail gas, so that the H2 content reaches 45%, improving the medium composition and reducing the molecular weight of the medium, thereby ensuring the normal and stable operation of the CO replacement tail gas compressor, effectively recovering the replacement tail gas, increasing the gas volumes of the CO and H2 product gases. The replacement tail gas buffer tank can be quickly moved to a designated position by using the moving wheels. After reaching the designated position, the moving wheels are then received into the support base, and the support base is used to support and fix the replacement tail gas buffer tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 is a schematic diagram of the structure of the replacement tail gas buffer tank of the present utility model;

[0019] Figure 3 is a schematic diagram of the structure of the support base of the present utility model;

[0020] Figure 4 is a schematic diagram of the structure of the adjusting assembly of the present utility model.

[0021] In the figure: 1. First gas transmission pipeline; 2. Flowmeter; 3. Control valve; 4. Displacement tail gas buffer tank; 5. Second gas transmission pipeline; 6. Control valve; 7. Displacement tail gas compressor; 8. Support base; 9. Adjustment assembly; 901. Hydraulic rod; 902. Connecting seat; 903. First connecting rod; 904. Second connecting rod; 905. Limit rod; 10. Movable wheel; 11. Mounting frame; 12. Support rod; 13. Clamping plate; 14. Lifting lug. Detailed implementation mode

[0022] To further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined utility model purpose, the following combines the drawings and preferred embodiments to elaborate in detail on the specific implementation mode, structure, characteristics and effects of the present utility model as follows.

[0023] Please refer to Figures 1-4 As shown in the figure, a displacement tail gas recovery device includes a first gas transmission pipeline 1, and further includes: a flowmeter 2 disposed outside the first gas transmission pipeline 1 to monitor the flow of internal gas and a control valve 3 to adjust the gas transmission volume. A displacement tail gas buffer tank 4 is disposed outside the first gas transmission pipeline 1, and the first gas transmission pipeline 1 is installed on the displacement tail gas buffer tank 4 through a flange; a second gas transmission pipeline 5 installed outside the displacement tail gas buffer tank 4, and a displacement tail gas compressor 7 is disposed at one end of the second gas transmission pipeline 5 away from the displacement tail gas buffer tank 4, and the mixed gas is transported to the inside of the displacement tail gas compressor 7 through the second gas transmission pipeline 5 for treatment; three support bases 8 arranged in an annular array at the bottom of the displacement tail gas buffer tank 4 are used to support and fix the displacement tail gas buffer tank 4 by means of the support bases 8. Movable wheels 10 are arranged inside the support bases 8, and the movable wheels 10 facilitate the movement of the displacement tail gas buffer tank 4. An adjustment assembly 9 for expanding and storing the movable wheels 10 is arranged inside the support bases 8.

[0024] Both the flowmeter 2 and the control valve 3 are installed outside the first gas transmission pipeline 1 through flanges. Both the flowmeter 2 and the control valve 3 are communicated with the first gas transmission pipeline 1. The flowmeter 2 is used to monitor the gas flow inside the pipeline, and the control valve 3 is used to adjust the gas flow.

[0025] A control valve 6 is arranged outside the second gas transmission pipeline 5. The control valve 6 is used to adjust the gas flow.

[0026] Two symmetrical lifting lugs 14 are arranged on the top of the displacement tail gas buffer tank 4. The lifting lugs 14 are welded to the top of the displacement tail gas buffer tank 4 to facilitate hoisting. A clamping plate 13 is arranged outside the displacement tail gas buffer tank 4, and the clamping plate 13 facilitates manual handling of the displacement tail gas buffer tank 4.

[0027] Support rods 12 are provided on the outer sides of the hydraulic rod 901 and the first connecting rod 903. The support rods 12 are welded inside the support base 8. The adjusting assembly 9 includes a hydraulic rod 901 provided inside the support base 8. The hydraulic rod 901 is rotatably mounted on the support rod 12. A connecting seat 902 is provided on the piston rod of the hydraulic rod 901, and the piston rod is mounted on the connecting seat 902. A first connecting rod 903 is provided on the outer side of the connecting seat 902. The first connecting rod 903 is rotatably connected to the support rod 12. The connecting seat 902 is rotatably connected to the first connecting rod 903. A second connecting rod 904 is provided on the outer side of the first connecting rod 903. The second connecting rod 904 is rotatably connected to the lower part of the first connecting rod 903. A limiting rod 905 is provided on the outer side of the second connecting rod 904. One end of the limiting rod 905 is rotatably connected to the support base 8, and the other end is rotatably connected to the middle part of the second connecting rod 904.

[0028] An installation frame 11 is provided on the outer side of the second connecting rod 904. The installation frame 11 is welded to the bottom of the second connecting rod 904. A moving wheel 10 is provided inside the installation frame 11, and the moving wheel 10 is rotatably connected in the installation frame 11.

[0029] Working principle: Coarse hydrogen gas at the outlet of the first stage of PSA-H2 (hydrogen content 95 - 98%) passes through the first gas transmission pipeline 1, flowmeter 2, and regulating valve 3 to control the entry of the coarse hydrogen gas into the CO replacement tail gas buffer tank 4, where it is mixed with the PSA-CO replacement tail gas, so that the H2 content reaches 45%, improving the medium composition and reducing the molecular weight of the medium, thereby ensuring the normal and stable operation of the CO replacement tail gas compressor 7, effectively recovering the replacement tail gas, and increasing the gas volumes of the CO and H2 product gases. When installing the replacement tail gas buffer tank 4, first move it to the designated position. During the movement, the hydraulic rod 901 is activated. The extension of the hydraulic rod 901 drives the first connecting rod 903 to extend outwards. The first connecting rod 903 drives the second connecting rod 904 to turn downwards. When the second connecting rod 904 moves, it drives the limiting rod 905 to turn downwards. The limiting rod 905 is used to limit the second connecting rod 904. When the second connecting rod 904 unfolds to the vertical state, it drives the moving wheel 10 to contact the ground vertically through the installation frame 11, thereby lifting the support base 8. The replacement tail gas buffer tank 4 can be quickly moved to the designated position by using the moving wheel 10. After reaching the designated position, the moving wheel 10 is then retracted into the support base 8, and the support base 8 is used to support and fix the replacement tail gas buffer tank 4.

[0030] The above are only the preferred embodiments of the present utility model, and do not impose any formal restrictions on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present utility model by using the technical content disclosed above. However, as long as it does not depart from the content of the technical solution of the present utility model, any brief modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A replacement tail gas recovery device, comprising a first gas transmission pipeline (1), characterized in that, It further includes: A flowmeter (2) for monitoring the flow rate of the internal gas and a regulating valve (3) for regulating the gas delivery volume, which are arranged outside the first gas transmission pipeline (1). A replacement tail gas buffer tank (4) is arranged outside the first gas transmission pipeline (1); A second gas transmission pipeline (5) installed outside the replacement tail gas buffer tank (4). A replacement tail gas compressor (7) is arranged at one end of the second gas transmission pipeline (5) far from the replacement tail gas buffer tank (4); Three support seats (8) arranged in an annular array at the bottom of the replacement tail gas buffer tank (4). A moving wheel (10) is arranged inside the support seat (8), and an adjusting assembly (9) for unfolding and storing the moving wheel (10) is arranged inside the support seat (8).

2. The replacement tail gas recovery device according to claim 1, characterized in that: Both the flowmeter (2) and the regulating valve (3) are installed outside the first gas transmission pipeline (1) through flange plates.

3. The replacement tail gas recovery device according to claim 1, characterized in that: A control valve (6) is arranged outside the second gas transmission pipeline (5).

4. The replacement tail gas recovery device according to claim 1, characterized in that: Two symmetrical lifting lugs (14) are arranged at the top of the replacement tail gas buffer tank (4), and a buckle plate (13) is arranged outside the replacement tail gas buffer tank (4).

5. The replacement tail gas recovery device according to claim 1, characterized in that: The adjusting assembly (9) includes a hydraulic rod (901) arranged inside the support seat (8). A connecting seat (902) is arranged on the piston rod of the hydraulic rod (901). A first connecting rod (903) is arranged outside the connecting seat (902). A second connecting rod (904) is arranged outside the first connecting rod (903). A limiting rod (905) is arranged outside the second connecting rod (904).

6. The replacement tail gas recovery device according to claim 5, characterized in that: An installation frame (11) is arranged outside the second connecting rod (904), and a moving wheel (10) is arranged inside the installation frame (11).

7. The replacement tail gas recovery device according to claim 5, characterized in that: Support rods (12) are arranged outside both the hydraulic rod (901) and the first connecting rod (903).

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