A low-temperature methanol washing residual pressure utilization device and method

Abstract

The present invention discloses a device for utilizing the residual pressure of low-temperature methanol washing, which includes an absorption tower, a cooler, a low-temperature methanol storage tank, a waste liquid recovery tank, and a gas recovery tower; an intake pipe and an outlet pipe are provided at the top of the absorption tower, both of which are internally communicated with the absorption tank inside the absorption tower, and the outlet pipe is internally communicated with the cooler; a pressure sensor, a controller, and a pressure relief pipe are provided on the outlet pipe, a pressure relief mechanism is provided on the pressure relief pipe, and a heat conduction pipe is provided on the absorption tank; the method for utilizing the residual pressure of the above-mentioned device includes: S1. performing low-temperature methanol washing and cooling on the gas; S2. performing pressure relief and heat conduction when the pressure in the absorption tower is too high; S3. continuing to perform low-temperature methanol washing after the pressure relief is completed; effectively utilizing the gas residual pressure and high-temperature heat energy, and improving the washing efficiency of low-temperature methanol washing.

Description

Technical Field

[0001] The present invention relates to the technical field of residual pressure utilization, and specifically relates to an equipment and method for utilizing the residual pressure in low-temperature methanol washing. Background Technique

[0002] Low-Temperature Methanol Washing is a process for gas purification and separation, and is commonly used for desulfurization, dehydration, etc. of natural gas and coal gas.

[0003] During the low-temperature methanol washing process, the main place where residual pressure is generated is in the washing tower. The washing tower is a device for absorbing and separating impurities in the raw material gas. During the low-temperature methanol washing process, methanol is used to absorb some impurities in the raw material gas. Since methanol reacts with the impurities in the raw material gas for absorption, this will generate a certain amount of heat, resulting in an increase in the temperature inside the washing tower. When the gas passes through the washing tower, as the temperature rises, the pressure inside the washing tower will increase, forming a certain amount of residual pressure.

[0004] Therefore, it is necessary to control the residual pressure to prevent the temperature of the washing tower from being too high or the pressure from being too large, which may lead to an explosion. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides an equipment and method for utilizing the residual pressure in low-temperature methanol washing.

[0006] The technical solution of the present invention is: An equipment for utilizing the residual pressure in low-temperature methanol washing, including an absorption tower, a cooler, a low-temperature methanol storage tank, a waste liquid recovery tank, and a gas recovery tower. The cooler, the low-temperature methanol storage tank, the waste liquid recovery tank, and the gas recovery tower are all connected to the absorption tower;

[0007] An air inlet pipe and an air outlet pipe are provided at the top of the absorption tower. An absorption tank for releasing low-temperature methanol liquid is provided inside the absorption tower. One ends of the air inlet pipe and the air outlet pipe are both connected to the inside of the absorption tank. The other end of the air outlet pipe is connected to the inside of the cooler. An exhaust pipe is provided on the cooler;

[0008] An inlet liquid pipe and a drain pipe respectively corresponding to the upper and lower parts of the side wall of the absorption tank are provided and are connected to the inside of the absorption tank. The inlet liquid pipe penetrates through the side wall of the absorption tower and is connected to the low-temperature methanol storage tank. The drain pipe penetrates through the side wall of the absorption tower and is connected to the waste liquid recovery tank; The air inlet pipe is located between the inlet liquid pipe and the drain pipe;

[0009] A pressure sensor, a controller, and a pressure relief pipe are provided on the air outlet pipe located inside the absorption tower. The pressure relief pipe is connected to the gas recovery tower, and a pressure relief mechanism is provided on the pressure relief pipe. The pressure sensor and the pressure relief mechanism are both electrically connected to the controller;

[0010] A heat conduction pipe is arranged around the side wall of the absorption tank, one end of the heat conduction pipe passes through the side wall of the absorption tower and surrounds the exhaust pipe, the other end of the heat conduction pipe is connected with one end of the heat conduction pipe to form a closed loop, and a circulating water pump is arranged on the heat conduction pipe, and the circulating water pump is electrically connected to the controller.

[0011] As a solution of the present invention, the pressure relief mechanism includes a switch valve, a folding pipe and a pressure ring; the pressure relief pipe is divided into a front pipe connected to the gas outlet pipe and a rear pipe penetrating the side wall of the absorption tower and connected to the gas recovery tower by the folding pipe, the switch valve is arranged on the front pipe, and the switch valve is electrically connected to the controller, the pressure ring is sleeved on the folding pipe, and a spacing for the pressure ring to move is reserved between the front pipe and the rear pipe;

[0012] The two ends of the folded tube are respectively fixedly and sealedly connected to the inner wall of the front tube and the inner wall of the rear tube. A hole plate for providing wind resistance is provided in the folded tube. The hole plate passes through the folded tube and is fixedly connected to the pressure ring.

[0013] The air inlet pipe is provided with a first gear for rotating and opening the air inlet pipe, a slide rod is horizontally provided in the absorption tower with one end connected to its inner wall, the slide rod is provided with a first tooth plate that is slidably connected to the slide groove provided on the slide rod through a slider, and the pressure ring is provided with a driving frame for moving the first tooth plate, and a gap is left between the driving frame and the first tooth plate.

[0014] Description: When the pressure sensor detects that the pressure is too high, the pressure is released. During the pressure release, the pressure ring is pushed by the air pressure, and the movement of the pressure ring is used for transmission to close the air intake pipe, blocking the continuous entry of the gas to be cleaned, and gradually reducing the air pressure and temperature. The kinetic energy generated by the residual pressure is converted into the driving energy of the mechanical structure, thereby improving the automation effect.

[0015] Furthermore, the drain pipe is provided with a second gear for rotating to open and close the drain pipe, and one side of the second gear is provided with a spring rod with a bottom fixedly connected to the bottom of the absorption tower, and the top of the spring rod is provided with a second tooth plate that dynamically meshes with the second gear. The second tooth plate is fixedly connected to the pressure ring through a bent air bag, and the bent section of the air bag is provided with a fixed sleeve, and the fixed sleeve is fixedly connected to the inner wall of the absorption tower through a fixed rod.

[0016] Description: By setting up the air bag, the pressure ring can convert the moving stroke into the stroke of the second tooth plate through the air bag when it moves, so that during the pressure relief process, the pressure ring can synchronously control the opening and closing of the discharge pipe to improve the automation effect.

[0017] Furthermore, a guide hole is provided at the center of the first gear and is rotatably sealed with the intake pipe. A semicircular baffle is provided in the guide hole and the intake pipe for cooperating with each other to control the opening or closing of the intake pipe.

[0018] The structures of the second gear and the drain pipe are the same as those of the first gear and the inlet pipe.

[0019] Explanation: By providing the guide holes and the semi-circular baffles, when the first gear and the second gear rotate, the opening or closing of the gas outlet pipe and the drain pipe can be achieved through the intersection or coincidence of the guide holes and the semi-circular baffles.

[0020] Furthermore, the low-temperature methanol storage tank is an automatic quantitative liquid adding device.

[0021] Explanation: By automatically adding low-temperature methanol quantitatively, it is possible to timely supplement a certain amount of low-temperature methanol into the absorption tank during pressure relief to replace the low-temperature methanol that has reacted to saturation.

[0022] Furthermore, a plurality of spraying branch pipes are provided on the liquid inlet pipe located in the absorption tank.

[0023] Explanation: Through the distribution of the plurality of spraying branch pipes, as much gas in the absorption tank as possible can be contacted, thereby improving the washing efficiency.

[0024] Furthermore, an alarm is provided on the gas outlet pipe and is electrically connected to the controller.

[0025] Explanation: By providing the alarm, it can timely notify the staff to observe during pressure relief, so as to control the opening and closing of the on-off valve.

[0026] As another solution of the present invention, the pressure relief mechanism is a safety valve electrically connected to the controller.

[0027] Explanation: The safety valve is a precise and complex device. Controlling the opening and closing of the pressure relief pipe through the safety valve can improve safety.

[0028] A method for utilizing the residual pressure according to any one of the above-mentioned low-temperature methanol washing devices includes the following steps:

[0029] S1. Continuously introduce the gas to be washed from the inlet pipe into the absorption tank. The low-temperature methanol in the absorption tank contacts the gas to be washed countercurrently and absorbs hydrogen sulfide. The gas after being absorbed by the low-temperature methanol is then discharged from the gas outlet pipe and enters the cooler for cooling. After cooling is completed, the gas is discharged through the exhaust pipe and enters the next process;

[0030] S2. During the absorption process, the temperature in the absorption tank rises and the pressure increases. When the pressure sensor detects that the pressure value exceeds the normal pressure value, the pressure sensor transmits a signal to the controller to control the pressure relief mechanism to open the pressure relief pipe, so that a part of the gas discharged from the gas outlet pipe is diverted and discharged from the pressure relief pipe into the gas recovery tower;

[0031] During the pressure relief process, the controller controls the operation of the water pump, so that the liquid in the heat conduction pipe circulates, and the liquid transfers the heat energy of the absorption tank to the outer wall of the exhaust pipe, thereby reducing the phenomenon of pipe icing in the exhaust pipe due to the too low temperature of the internal gas;

[0032] At the same time, the staff closes the intake pipe and opens the drain valve of the drain pipe, so that the waste liquid in the absorption tank flows into the waste liquid recovery tank. After the discharge is completed, the drain pipe is closed again;

[0033] S3. After the pressure relief is completed, open the intake pipe and the liquid inlet pipe, so that the low-temperature methanol in the low-temperature methanol storage tank enters the absorption tank to continue the subsequent absorption.

[0034] The beneficial effects of the present invention are:

[0035] (1) By setting a pressure sensor and a safety valve, the low-temperature methanol washing residual pressure utilization equipment of the present invention can relieve pressure through the safety valve when the pressure sensor detects excessive pressure, ensuring the safety of the equipment.

[0036] (2) A heat conduction pipe is provided in the low-temperature methanol washing residual pressure utilization equipment of the present invention, so that during the pressure relief process, the controller controls the operation of the water pump, so that the liquid in the heat conduction pipe circulates, and the heat energy of the absorption tank is transferred to the outer wall of the exhaust pipe, thereby reducing the phenomenon of pipe icing in the exhaust pipe due to the too low temperature of the internal gas. Description of the Drawings

[0037] Figure 1 is the overall appearance diagram of the low-temperature methanol washing residual pressure utilization equipment of the present invention;

[0038] Figure 2 is the internal structure diagram of Embodiment 1 of the low-temperature methanol washing residual pressure utilization equipment of the present invention;

[0039] Figure 3 is the left-side perspective view of Embodiment 1 of the low-temperature methanol washing residual pressure utilization equipment of the present invention;

[0040] Figure 4 is the internal structure diagram of the absorption tank of the low-temperature methanol washing residual pressure utilization equipment of the present invention;

[0041] Figure 5 is the internal structure diagram of Embodiment 2 of the low-temperature methanol washing residual pressure utilization equipment of the present invention;

[0042] Figure 6 is Figure 5 the enlarged schematic diagram at I in

[0043] Figure 7 is the distribution diagram of the second gear of the low-temperature methanol washing residual pressure utilization equipment of the present invention;

[0044] Figure 8It is the structural diagram of the pressure ring of the residual pressure utilization equipment for low-temperature methanol washing in the present invention;

[0045] Figure 9 It is the structural diagram of the driving frame of the residual pressure utilization equipment for low-temperature methanol washing in the present invention;

[0046] Figure 10 It is the structural diagram of the first gear of the residual pressure utilization equipment for low-temperature methanol washing in the present invention;

[0047] Figure 11 It is the structural diagram of the guide hole of the residual pressure utilization equipment for low-temperature methanol washing in the present invention

[0048] Among them, 1 - absorption tower, 11 - inlet pipe, 111 - first gear, 112 - first toothed plate, 113 - sliding chute rod, 114 - slider, 12 - outlet pipe, 13 - pressure ring, 131 - folding pipe, 132 - driving frame, 133 - orifice plate, 2 - cooler, 21 - heat conduction pipe, 3 - low-temperature methanol storage tank, 31 - inlet liquid pipe, 32 - spraying branch pipe, 4 - waste liquid recovery tank, 41 - drain pipe, 411 - second gear, 412 - second toothed plate, 413 - spring rod, 414 - airbag, 415 - fixed sleeve, 5 - gas recovery tower, 51 - pressure relief pipe, 6 - absorption tank, 61 - filter screen. Detailed implementation mode

[0049] The present invention will be further described in detail below in combination with the specific implementation mode to better reflect the advantages of the present invention.

[0050] Example 1

[0051] A residual pressure utilization equipment for low-temperature methanol washing, as Figure 1 shown, includes an absorption tower 1, a cooler 2, a low-temperature methanol storage tank 3, a waste liquid recovery tank 4 and a gas recovery tower 5. The cooler 2, the low-temperature methanol storage tank 3, the waste liquid recovery tank 4 and the gas recovery tower 5 are all connected to the absorption tower 1; the low-temperature methanol storage tank 3 is an automatic quantitative liquid adding device;

[0052] As Figure 1 and Figure 2 shown, the top of the absorption tower 1 is provided with an inlet pipe 11 and an outlet pipe 12. An absorption tank 6 for releasing low-temperature methanol liquid is arranged inside the absorption tower 1. One ends of the inlet pipe 11 and the outlet pipe 12 are both internally connected to the absorption tank 6. The other end of the outlet pipe 12 is internally connected to the cooler 2, and an exhaust pipe is arranged on the cooler 2;

[0053] As Figure 2 、 Figure 3 and Figure 4As shown in the figure, an inlet pipe 31 and a drain pipe 41 which are respectively communicated with the inside thereof are provided at the upper and lower parts of the side wall of the absorption tank 6. The inlet pipe 31 penetrates through the side wall of the absorption tower 1 and is communicated with the low-temperature methanol storage tank 3. The drain pipe 41 penetrates through the side wall of the absorption tower 1 and is communicated with the waste liquid recovery tank 4. The inlet gas pipe 11 is located between the inlet pipe 31 and the drain pipe 41. A plurality of spraying branch pipes 32 are provided on the inlet pipe 31 located in the absorption tank 6.

[0054] As Figure 2 shown in the figure, a pressure sensor, a controller and a pressure relief pipe 51 are provided on the outlet gas pipe 12 located in the absorption tower 1. The pressure relief pipe 51 is communicated with the gas recovery tower 5, and a pressure relief mechanism is provided on the pressure relief pipe 51. The pressure relief mechanism is a safety valve electrically connected to the controller. An alarm electrically connected to the controller is provided on the outlet gas pipe 11. The pressure sensor, the safety valve and the alarm are all electrically connected to the controller.

[0055] As Figure 3 shown in the figure, a heat conduction pipe 21 is provided around the side wall of the absorption tank 6. One end of the heat conduction pipe 21 penetrates through the side wall of the absorption tower 1 and surrounds the exhaust pipe. The other end of the heat conduction pipe 21 is communicated with one end of the heat conduction pipe 21 to form a closed loop, and a circulating water pump is provided on the heat conduction pipe 21. The circulating water pump is electrically connected to the controller.

[0056] The quantitative automatic liquid adding device, the pressure sensor, the safety valve, the alarm and the controller are all commercially available existing devices.

[0057] A method for utilizing residual pressure by using the above-mentioned low-temperature methanol washing equipment includes the following steps:

[0058] S1. Continuously introduce the gas to be washed into the absorption tank 6 from the inlet gas pipe 11. The low-temperature methanol in the absorption tank 6 contacts the gas to be washed countercurrently and absorbs hydrogen sulfide. The gas absorbed by the low-temperature methanol is then discharged from the outlet gas pipe 12 and enters the cooler 2 for cooling. After cooling, the gas is discharged through the exhaust pipe and enters the next process.

[0059] S2. During the absorption process, the temperature in the absorption tank 6 rises and the pressure increases. When the pressure sensor detects that the pressure value exceeds the normal pressure value, the pressure sensor transmits a signal to the controller to open both the safety valve and the alarm, so that a part of the gas discharged from the outlet gas pipe 12 is diverted and discharged from the pressure relief pipe 51 to the gas recovery tower 5.

[0060] During the pressure relief process, the controller controls the operation of the water pump, so that the liquid in the heat conduction pipe 21 circulates, and the liquid transfers the heat energy of the absorption tank 6 to the outer wall of the exhaust pipe, thereby reducing the phenomenon of pipeline icing of the exhaust pipe due to the too low temperature of the internal gas.

[0061] S3. After the pressure relief is completed, the air inlet pipe 11 and the liquid inlet pipe 31 are opened to allow the low-temperature methanol in the low-temperature methanol storage tank 3 to enter the absorption tank 6 for subsequent absorption.

[0062] Example 2

[0063] This embodiment is different from Embodiment 1 in that Figure 5 As shown, the pressure relief mechanism includes a switch valve, a folded tube 131 and a pressure ring 13; the pressure relief tube 51 is divided into a front tube connected to the gas outlet pipe 12 and a rear tube penetrating the side wall of the absorption tower 1 and connected to the gas recovery tower 5 by the folded tube 131, the switch valve is arranged on the front tube, and the switch valve is electrically connected to the controller, the pressure ring 13 is sleeved on the folded tube 131, and a spacing for the pressure ring 13 to move is reserved between the front tube and the rear tube;

[0064] like Figure 5 and Figure 8 As shown, the two ends of the folded tube 131 are respectively fixedly and sealedly connected to the inner wall of the front tube and the inner wall of the rear tube, and a hole plate 133 for providing wind resistance is provided in the folded tube 131, and the hole plate 133 passes through the folded tube 131 and is fixedly connected to the pressure ring 13;

[0065] like Figure 5 , Figure 6 and Figure 9 As shown, the air inlet pipe 11 is provided with a first gear 111 for rotating and opening and closing the air inlet pipe 11, a slide rod 113 is horizontally provided in the absorption tower 1 with one end connected to its inner side wall, the slide rod 113 is provided with a first tooth plate 112 that is slidably connected to the slide groove provided on the slide rod 113 through a slider 114, and the pressure ring 13 is provided with a driving frame 132 for moving the first tooth plate 112, and a gap is left between the driving frame 132 and the first tooth plate 112;

[0066] like Figure 5 and Figure 7 As shown, the drain pipe 41 is provided with a second gear 411 for rotating and opening and closing the drain pipe 41, and one side of the second gear 411 is provided with a spring rod 413 with a bottom fixedly connected to the bottom of the absorption tower 1, and the top of the spring rod 413 is provided with a second tooth plate 412 that is dynamically meshed and driven with the second gear 411, and the second tooth plate 412 is fixedly connected to the pressure ring 13 through a bent air bag 414, and the bent section of the air bag 414 is provided with a fixed sleeve 415, and the fixed sleeve 415 is fixedly connected to the inner wall of the absorption tower 1 through a fixed rod;

[0067] like Figure 10 and Figure 11As shown, a guide hole rotatably and sealingly connected to the intake pipe 11 is provided at the center of the first gear 111, and a semi-circular shutter for cooperatively controlling the opening or closing of the intake pipe 11 is provided in both the guide hole and the intake pipe 11;

[0068] As Figure 10 and Figure 11 shown, the structures of the second gear 411 and the drain pipe 41 are the same as those of the first gear 111 and the intake pipe 11.

[0069] The difference between the above residual pressure utilization method and Embodiment 1 is that

[0070] S2. During pressure relief, the pressure sensor controls the opening of the relief valve 51 through the controller, and the pressure ring 13 and the orifice plate 133 move closer to the rear pipe under the action of gas impact. As a result, the folding pipe 131 closer to the front pipe expands, and the folding pipe 131 closer to the rear pipe is compressed. During this process, the pressure ring 13 first drives the driving frame 132 to move to the right by the gap, gradually approaching the first toothed plate 112 until the left end of the driving frame 132 contacts the first toothed plate 112 and drives the first toothed plate 112 to synchronously move to the right by a stroke for driving the first gear 111 to rotate. During the stroke, the first toothed plate 112 meshes and drives with the first gear 111 due to displacement, thereby controlling the first gear 111 to close the intake pipe 11 and blocking the introduction of the gas to be washed;

[0071] On the other hand, the pressure ring 13 moves to the right to compress the airbag 414, and the end of the airbag 414 connected to the second toothed plate 412 expands and drives the second toothed plate 412 to move downward. During the blank stroke stage, the second toothed plate 412 compresses the spring rod 413 and also moves downward by the same distance of the blank stroke, and the second gear 411 remains stationary. During the effective stroke stage, the second toothed plate 412 continues to move downward by the same distance of the effective stroke. At this time, the second toothed plate 412 meshes and drives with the second gear 411, thereby opening the drain pipe 41 for drainage;

[0072] S3. After the pressure relief is completed, the orifice plate 133 drives the pressure ring 13 to return to the initial position, that is, move to the left. At this time, the pressure ring 13 first drives the driving frame 132 to move to the left by a distance of the gap until the right end of the driving frame 132 contacts the first toothed plate 112, and then drives the first toothed plate 112 to synchronously move to the left for the movement of the effective stroke. Thus, during the effective stroke, the first toothed plate 112 meshes and drives with the first gear 111 in the reverse direction to open the intake pipe 11, and the gas continues to be introduced;

[0073] When the pressure ring 13 moves a certain distance in the clearance, one end of the airbag 414 connected to the second toothed plate 412 contracts, driving the second toothed plate 412 to move upward and meshing with the second gear 411 in the reverse direction to drive, thereby closing the drain pipe 41. Then, when the pressure ring 13 continues to move upward during the effective stroke, at this time, the second toothed plate 412 disengages from the second gear 411, and the drain pipe 41 is closed for a period of time earlier than the intake pipe 11.

Claims

1. A low-temperature methanol wash residual pressure utilization device, characterized in that, It comprises an absorption tower (1), a cooler (2), a low-temperature methanol storage tank (3), a waste liquid recovery tank (4) and a gas recovery tower (5), wherein the cooler (2), the low-temperature methanol storage tank (3), the waste liquid recovery tank (4) and the gas recovery tower (5) are all connected to the absorption tower (1); An air inlet pipe (11) and an air outlet pipe (12) are provided at the top of the absorption tower (1); an absorption tank (6) for releasing low-temperature methanol liquid is provided in the absorption tower (1); one end of the air inlet pipe (11) and the air outlet pipe (12) are both in communication with the interior of the absorption tank (6); the other end of the air outlet pipe (12) is in communication with the interior of a cooler (2); and an exhaust pipe is provided on the cooler (2); The upper and lower parts of the side wall of the absorption tank (6) are respectively provided with a liquid inlet pipe (31) and a liquid discharge pipe (41) which are in communication with the interior thereof; the liquid inlet pipe (31) penetrates the side wall of the absorption tower (1) and is in communication with the low-temperature methanol storage tank (3); the liquid discharge pipe (41) penetrates the side wall of the absorption tower (1) and is in communication with the waste liquid recovery tank (4); the air inlet pipe (11) is located between the liquid inlet pipe (31) and the liquid discharge pipe (41); The gas outlet pipe (12) located in the absorption tower (1) is provided with a pressure sensor, a controller and a pressure relief pipe (51), the pressure relief pipe (51) is connected to the gas recovery tower (5), and a pressure relief mechanism is provided on the pressure relief pipe (51), and the pressure sensor and the pressure relief mechanism are both electrically connected to the controller; A heat conducting pipe (21) is disposed around the side wall of the absorption tank (6), one end of the heat conducting pipe (21) passes through the side wall of the absorption tower (1) and surrounds the exhaust pipe, the other end of the heat conducting pipe (21) is connected to one end of the heat conducting pipe (21) to form a closed loop, and a circulating water pump is disposed on the heat conducting pipe (21), and the circulating water pump is electrically connected to the controller; The pressure relief mechanism comprises a folded tube (131) and a pressure ring (13); the pressure relief tube (51) is divided into a front tube connected to the gas outlet tube (12) and a rear tube penetrating the side wall of the absorption tower (1) and connected to the gas recovery tower (5) by the folded tube (131); the pressure ring (13) is sleeved on the folded tube (131); two ends of the folded tube (131) are respectively fixedly and sealedly connected to the inner wall of the front tube and the inner wall of the rear tube; an orifice plate (133) for providing wind resistance is provided in the folded tube (131); the orifice plate (133) penetrates the folded tube (131) and is fixedly connected to the pressure ring (13); The air inlet pipe (11) is provided with a first gear (111) for rotating and opening and closing the air inlet pipe (11); a slide groove rod (113) is transversely provided in the absorption tower (1) and one end of the slide groove rod is connected to the inner side wall thereof; the slide groove rod (113) is provided with a first tooth plate (112) which is slidably connected to a slide groove provided on the slide groove rod (113) via a slider (114); and the pressure ring (13) is provided with a driving frame (132) for moving the first tooth plate (112).

2. The low-temperature methanol washing residual pressure utilization device according to claim 1, characterized in that The pressure relief mechanism further includes a switching valve; the switching valve is arranged on the front pipe, and the switching valve is electrically connected to the controller, and there is a spacing for the movement of the pressure ring (13) between the front pipe and the rear pipe; there is a gap between the driving frame (132) and the first toothed plate (112).

3. The low-temperature methanol wash residual pressure utilization device according to claim 2, characterized in that, A second gear (411) for rotating and opening / closing the drain pipe (41) is arranged on the drain pipe (41). A spring rod (413) with its bottom fixedly connected to the inner bottom of the absorption tower (1) is arranged on one side of the second gear (411). A second toothed plate (412) that is dynamically meshed and driven with the second gear (411) is arranged at the top of the spring rod (413). The second toothed plate (412) is fixedly connected to the pressure ring (13) through a bent airbag (414). A fixing sleeve (415) is sleeved on the bent section of the airbag (414). The fixing sleeve (415) is fixedly connected to the inner wall of the absorption tower (1) through a fixing rod.

4. The low-temperature methanol wash residual pressure utilization device according to claim 3, characterized in that, A guide hole that is rotationally and hermetically connected to the inlet pipe (11) is arranged at the center of the first gear (111). A semi-circular shutter for mutually cooperating to control the opening or closing of the inlet pipe (11) is arranged in both the guide hole and the inlet pipe (11). The structures of the second gear (411) and the drain pipe (41) are the same as those of the first gear (111) and the inlet pipe (11).

5. A low-temperature methanol wash residual pressure utilization device according to claim 1, characterized in that, The low-temperature methanol storage tank (3) is an automatic quantitative liquid adding device.

6. The low-temperature methanol washing residual pressure utilization device according to claim 1, characterized in that A plurality of spraying branch pipes (32) are arranged on the liquid inlet pipe (31) located in the absorption tank (6).

7. A low-temperature methanol wash residual pressure utilization device according to claim 1, characterized in that, An alarm is arranged on the outlet pipe (12) and is electrically connected to the controller.

8. The utilization method of a low-temperature methanol wash residual pressure utilization device according to any one of claims 1 to 7, characterized in that, It includes the following steps: S1. Continuously introduce the gas to be washed into the absorption tank (6) from the inlet pipe (11). The low-temperature methanol in the absorption tank (6) comes into countercurrent contact with the gas to be washed and absorbs hydrogen sulfide. The gas absorbed by the low-temperature methanol is then discharged from the outlet pipe (12) and enters the cooler (2) for cooling. After cooling, the gas is discharged through the exhaust pipe and enters the next process; S2. During the absorption process, the temperature in the absorption tank (6) rises and the pressure increases. When the pressure sensor detects that the pressure value exceeds the normal pressure value, the pressure sensor transmits a signal to the controller to control the pressure relief mechanism to open the pressure relief pipe (51), so that a part of the gas discharged from the outlet pipe (12) is diverted and discharged from the pressure relief pipe (51) into the gas recovery tower (5); During the pressure relief process, the controller controls the operation of the water pump, so that the liquid in the heat conduction pipe (21) circulates. The liquid transfers the heat energy of the absorption tank (6) to the outer wall of the exhaust pipe, thereby reducing the phenomenon of pipe icing of the exhaust pipe due to the too low temperature of the internal gas; At the same time, the staff closes the inlet pipe (11) and opens the drain pipe (41), so that the waste liquid in the absorption tank (6) flows into the waste liquid recovery tank (4). After the discharge is completed, the drain pipe (41) is closed again; S3. After the pressure relief is completed, open the inlet pipe (11) and the liquid inlet pipe (31), so that the low-temperature methanol in the low-temperature methanol storage tank (3) enters the absorption tank (6) to continue the subsequent absorption.

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