Tail gas hydrogen production desorption device capable of reducing moisture content of desorption gas

Abstract

The utility model relates to the technical field of tail gas hydrogen production desorption, in particular to a tail gas hydrogen production desorption device capable of reducing the water content of desorption gas, which comprises a pressure swing adsorption tank, a reverse release tank, a heat exchanger and a desorption gas buffer tank, a first hydrogen pipeline is communicated between the pressure swing adsorption tank and the heat exchanger, and a second hydrogen pipeline is communicated between the heat exchanger and the desorption buffer tank. A tail gas pipeline is communicated between the reverse release tank and the desorption gas buffer tank, and the desorption gas buffer tank is communicated with a desorption gas conveying pipeline. The device is reasonable and compact in structure and convenient to use, avoids corrosion and leakage accidents of the desorption gas conveying pipeline, improves the safety productivity of enterprises, and has the characteristics of safety, labor saving, simplicity, convenience and high efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas hydrogen production and analysis, and is a tail gas hydrogen production and analysis device for reducing the water content of the analysis gas. Background Technique

[0002] When the analysis gas buffer tank of the tail gas hydrogen production device of a certain chemical enterprise operates normally, it mainly cools and analyzes the hydrogen gas transported from the pressure swing adsorption tank and the tail gas transported from the reverse release tank, and the analyzed gas is sent to the calcium carbide analysis gas pipeline network.

[0003] Among them, the gas in the pressure swing adsorption tank is input into the analysis gas buffer tank by relying on a vacuum pump. The vacuum pump is a water ring vacuum pump, the displacement of the vacuum pump is 1500 Nm³ / h, the temperature of the medium in the vacuum pump outlet pipeline is 35.00°C to 42.00°C, and the gas at 35.00°C to 42.00°C enters the analysis gas buffer tank for analysis and then is transported to the calcium carbide analysis gas pipeline network. Since the water content of the saturated analysis gas is different at different temperatures, the analysis gas transportation pipeline network between the analysis gas buffer tank and each device of the downstream process system is as long as 2.8 km, and the temperature at the end of the analysis gas transportation drops to 10.00°C to 15.00°C. Cold water precipitation occurs during the transportation of the analysis gas as the temperature drops. The analysis gas contains acidic gases such as CO2 and H2S, which form an acidic solvent (pH is about 4.50 to 5.50) after dissolving in water. Long-term operation leads to corrosion and leakage of the analysis gas transportation pipeline, and the leakage of the analysis gas affects the normal operation of the tail gas hydrogen production device.

[0004] To sum up, the analysis gas transportation pipeline is prone to corrosion and leakage after long-term operation, bringing great potential safety hazards and economic losses to the enterprise, and becoming a technical problem difficult to solve for the enterprise. Summary of the Invention

[0005] The utility model provides a tail gas hydrogen production and analysis device for reducing the water content of the analysis gas, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem of easy corrosion and leakage existing in the existing analysis gas transportation pipeline.

[0006] The technical solution of the utility model is realized by the following measures: a tail gas hydrogen production and analysis device for reducing the water content of the analysis gas, including a pressure swing adsorption tank, a reverse release tank, a heat exchanger, and an analysis gas buffer tank. There is a first hydrogen gas pipeline fixedly connected between the top gas outlet of the pressure swing adsorption tank and the upper gas inlet of the heat exchanger, a second hydrogen gas pipeline fixedly connected between the lower gas outlet of the heat exchanger and the lower first gas inlet of the analysis buffer tank, a tail gas pipeline fixedly connected between the lower gas outlet of the reverse release tank and the lower second gas inlet of the analysis gas buffer tank, and an analysis gas transportation pipeline fixedly connected to the lower gas outlet of the analysis buffer tank.

[0007] The following is a further optimization or / and improvement of the above-mentioned technical solution of the utility model:

[0008] The above heat exchanger is a floating head type shell and tube heat exchanger. The inner cavity of the heat exchanger includes a tube side and a shell side. A low-temperature water supply pipeline is fixedly connected to the liquid inlet at the lower part of the shell side, and a low-temperature water return pipeline is fixedly connected to the liquid outlet at the upper part of the shell side.

[0009] The above heat exchanger includes a floating head and a cylinder body. There is a fixed connection between the inlet of the first hydrogen pipeline and the inlet of the upper floating head, and a fixed connection between the outlet of the lower floating head and the outlet of the second hydrogen pipeline.

[0010] A vacuum pump is fixedly installed on the above first hydrogen pipeline.

[0011] A drain pipeline is fixedly connected to the liquid outlet at the bottom of the above analytical gas buffer tank.

[0012] An electromagnetic regulating valve is fixedly installed on the above analytical gas conveying pipeline. An exhaust pipeline is fixedly connected to the analytical gas conveying pipeline between the inlet and the outlet of the electromagnetic regulating valve. A remote pressure gauge and a safety valve are fixedly installed on the exhaust pipeline in sequence along the medium flow direction.

[0013] A bypass pipeline is fixedly connected between the analytical gas conveying pipeline between the above exhaust pipeline and the electromagnetic regulating valve and the exhaust pipeline between the safety valve and the analytical gas conveying pipeline. A maintenance standby valve is fixedly installed on the bypass pipeline.

[0014] A first remote temperature measuring instrument is fixedly installed on the first hydrogen pipeline between the above vacuum pump and the inlet of the upper floating head.

[0015] A check valve and a second remote temperature measuring instrument are fixedly installed on the above second hydrogen pipeline in sequence along the medium flow direction.

[0016] The above device further includes a controller. The vacuum pump, the remote pressure gauge, the safety valve, the first remote temperature measuring instrument, and the second remote temperature measuring instrument are all electrically connected to the controller.

[0017] The structure of the present utility model is reasonable and compact, easy to use, reduces the occurrence of condensate water separation phenomenon during the transportation of analytical gas, avoids corrosion and leakage accidents of the analytical gas conveying pipeline, improves the production safety rate of the enterprise, and has the characteristics of safety, labor saving, simplicity, and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 is a schematic process flow diagram of the present utility model.

[0019] Attached Figure 1The codes in it are as follows: 1 is the pressure swing adsorption tank, 2 is the counter-current release tank, 3 is the heat exchanger, 4 is the analytical gas buffer tank, 5 is the first hydrogen pipeline, 6 is the second hydrogen pipeline, 7 is the tail gas pipeline, 8 is the analytical gas transmission pipeline, 9 is the tube side, 10 is the shell side, 11 is the low-temperature water supply pipeline, 12 is the low-temperature water return pipeline, 13 is the floating head, 14 is the cylinder body, 15 is the vacuum pump, 16 is the drainage pipeline, 17 is the electromagnetic regulating valve, 18 is the exhaust pipeline, 19 is the remote pressure gauge, 20 is the safety valve, 21 is the bypass pipeline, 22 is the maintenance standby valve, 23 is the first remote temperature measuring instrument, 24 is the check valve, 25 is the second remote temperature measuring instrument. Specific implementation mode

[0020] The present utility model is not restricted by the following embodiments, and the specific implementation mode can be determined according to the technical solution of the present utility model and the actual situation.

[0021] In the present utility model, unless otherwise specified, the equipment and devices used are all the existing well-known and commonly used equipment and devices in the field.

[0022] In the present utility model, for the convenience of description, the description of the relative position relationship of each component is carried out according to the layout mode of the Figure 1 attached drawings of the specification. For example, the position relationships such as front, rear, upper, lower, left, and right are determined according to the layout direction of the Figure 1 attached drawings of the specification.

[0023] The present utility model will be further described below in conjunction with the embodiments and the drawings:

[0024] Embodiment 1: As shown in the Figure 1 drawing, the tail gas hydrogen production analytical device for reducing the water content of the analytical gas includes a pressure swing adsorption tank 1, a counter-current release tank 2, a heat exchanger 3, and an analytical gas buffer tank 4. There is a fixed connection between the top gas outlet of the pressure swing adsorption tank 1 and the upper gas inlet of the heat exchanger 3 through a first hydrogen pipeline 5. There is a fixed connection between the lower gas outlet of the heat exchanger 3 and the first lower gas inlet of the analytical buffer tank 4 through a second hydrogen pipeline 6. There is a fixed connection between the lower gas outlet of the counter-current release tank 2 and the second lower gas inlet of the analytical gas buffer tank 4 through a tail gas pipeline 7. The lower gas outlet of the analytical buffer tank 4 is fixedly connected to an analytical gas transmission pipeline 8.

[0025] According to requirements, the temperature of the gas medium in the first hydrogen pipeline 5 is 35.00 °C to 42.00 °C, and the analytical gas transmission pipeline 8 is 2.8 km long.

[0026] According to actual needs, the above-mentioned tail gas hydrogen production analytical device for reducing the water content of the analytical gas can be further optimized or / and improved:

[0027] Embodiment 2: The difference from Embodiment 1 is that: As shown in the Figure 1As shown, the heat exchanger 3 is a floating head shell and tube heat exchanger. The inner cavity of the heat exchanger 3 includes a tube side 9 and a shell side 10. A low-temperature water supply pipeline 11 is fixedly connected to the liquid inlet at the lower part of the shell side 10, and a low-temperature water return pipeline 12 is fixedly connected to the liquid outlet at the upper part of the shell side 10.

[0028] As required, the medium in the low-temperature water supply pipeline 11 is 7°C process water.

[0029] Example 3: The difference from Examples 1 to 2 is that as shown in the appendix Figure 1 As shown, the heat exchanger 3 includes a floating head 13 and a cylinder body 14. There is a fixed connection between the gas inlet of the first hydrogen pipeline 5 and the gas inlet of the upper floating head 13, and a fixed connection between the gas outlet of the lower floating head 13 and the gas outlet of the second hydrogen pipeline 6.

[0030] Example 4: The difference from Examples 1 to 3 is that as shown in the appendix Figure 1 As shown, a vacuum pump 15 is fixedly installed on the first hydrogen pipeline 5.

[0031] As required, the vacuum pump 15 is a water ring vacuum pump with a displacement of 1500 Nm³ / h.

[0032] Example 5: The difference from Examples 1 to 4 is that as shown in the appendix Figure 1 As shown, a drain pipeline 16 is fixedly connected to the liquid outlet at the bottom of the analytical gas buffer tank 4.

[0033] Example 6: The difference from Examples 1 to 5 is that as shown in the appendix Figure 1 As shown, an electromagnetic regulating valve 17 is fixedly installed on the analytical gas transmission pipeline 8. An exhaust pipeline 18 is fixedly connected to the analytical gas transmission pipeline 8 between the inlet and the outlet of the electromagnetic regulating valve 17. A remote pressure gauge 19 and a safety valve 20 are fixedly installed on the exhaust pipeline 18 in sequence along the medium flow direction.

[0034] As required, when the device has an abnormal operation, the safety valve 20 can be used to quickly relieve pressure, and the relieved gas enters the analytical gas transmission pipeline 8 through the exhaust pipeline 18.

[0035] Example 7: The difference from Examples 1 to 6 is that as shown in the appendix Figure 1 As shown, a bypass pipeline 21 is fixedly connected between the analytical gas transmission pipeline 8 between the exhaust pipeline 18 and the electromagnetic regulating valve 17 and the exhaust pipeline 18 between the safety valve 20 and the analytical gas transmission pipeline 8. A maintenance standby valve 22 is fixedly installed on the bypass pipeline 21.

[0036] As required, when the electromagnetic regulating valve 17 fails, the analytical gas can be transported to the analytical gas transmission pipeline 8 through the bypass pipeline 21 and then enter the downstream process system.

[0037] Example 8: The difference from Examples 1 to 7 is that as shown in the appendix Figure 1 A first remote temperature measuring instrument 23 is fixedly installed on the first hydrogen pipeline 5 between the vacuum pump 15 and the air inlet of the floating head 13.

[0038] Example 9: The difference from Examples 1 to 8 is that as shown in the appendix Figure 1 A check valve 24 and a second remote temperature measuring instrument 25 are fixedly installed on the second hydrogen pipeline 6 in sequence along the medium flow direction.

[0039] Example 10: The difference from Examples 1 to 9 is that as shown in the appendix Figure 1 The device further includes a controller, and the vacuum pump 15, the remote pressure gauge 19, the safety valve 20, the first remote temperature measuring instrument 23, and the second remote temperature measuring instrument 25 are all electrically connected to the controller.

[0040] As needed, when the device has an abnormal operation, the safety valve 20 can be used to quickly relieve pressure, and the remaining working medium pressure in the analysis gas transmission pipeline 8 can be judged through the remote pressure gauge 19. When the displayed value of the remote pressure gauge 19 is within the safe range, maintenance personnel can repair the faults in the device.

[0041] As needed, on each pipeline and equipment of the tail gas hydrogen production analysis device for reducing the water content of the analysis gas, conventional valves, thermometers, pressure gauges, etc. well-known and commonly used in the art can also be set according to production needs. The controller can be a DCS controller, and the model of the DCS controller can be the CS3000 controller produced by Yokogawa Corporation of Japan.

[0042] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effects. Non-essential technical features can be increased or decreased according to actual needs to meet the requirements of different situations.

[0043] The usage process of the embodiment of the present utility model: First, the hydrogen in the pressure swing adsorption tank 1 enters the floating head 13 of the heat exchanger 3 through the first hydrogen pipeline 5, and the hydrogen in the floating head 13 enters the tube side 9; during this process, the low-temperature process water (7°C) enters the shell side 10 through the low-temperature water supply pipeline 11, and the low-temperature water medium (7°C) in the shell side 10 exchanges heat with and cools down the hydrogen (35.00°C to 42.00°C) in the tube side 9. The hydrogen cooled in the tube side 9 enters the lower floating head 13; then, the hydrogen in the lower floating head 13 enters the analysis gas buffer tank 4 through the second hydrogen pipeline 6 for analysis treatment; at the same time, the tail gas (containing hydrogen, carbon dioxide, and hydrogen sulfide) in the reverse release tank 2 enters the analysis gas buffer tank 4 through the tail gas pipeline 7 for analysis treatment; finally, the gas analyzed by the analysis gas buffer tank 4 enters the downstream process system through the analysis gas transmission pipeline 8.

Claims

1. A tail gas hydrogen production desorption device for reducing the water content of desorbed gas, characterized in that It includes a pressure swing adsorption tank, a reverse blow tank, a heat exchanger, and an analytical gas buffer tank. There is a fixed connection between the gas outlet at the top of the pressure swing adsorption tank and the gas inlet at the upper part of the heat exchanger through a first hydrogen pipeline. There is a fixed connection between the gas outlet at the lower part of the heat exchanger and the first gas inlet at the lower part of the analytical buffer tank through a second hydrogen pipeline. There is a fixed connection between the gas outlet at the lower part of the reverse blow tank and the second gas inlet at the lower part of the analytical gas buffer tank through a tail gas pipeline. The gas outlet at the lower part of the analytical buffer tank is fixedly connected to an analytical gas transmission pipeline.

2. The tail gas hydrogen production analysis device for reducing the water content of the analysis gas according to claim 1, characterized in that The heat exchanger is a floating head shell and tube heat exchanger. The inner cavity of the heat exchanger includes a tube side and a shell side. The liquid inlet at the lower part of the shell side is fixedly connected to a low-temperature water supply pipeline, and the liquid outlet at the upper part of the shell side is fixedly connected to a low-temperature water return pipeline.

3. The tail gas hydrogen production desorption device for reducing the water content of the desorbed gas according to claim 1 or 2, characterized in that The heat exchanger includes a floating head and a cylinder body. There is a fixed connection between the gas inlet of the first hydrogen pipeline and the gas inlet of the upper floating head, and there is a fixed connection between the gas outlet of the lower floating head and the gas outlet of the second hydrogen pipeline.

4. The tail gas hydrogen production analysis device for reducing the water content of the analysis gas according to claim 3, characterized in that A vacuum pump is fixedly installed on the first hydrogen pipeline.

5. The tail gas hydrogen production desorption device for reducing the water content of the desorbed gas according to claim 1 or 2 or 4, characterized in that The liquid outlet at the bottom of the analytical gas buffer tank is fixedly connected to a drainage pipeline.

6. The tail gas hydrogen production desorption device for reducing the water content of the desorbed gas according to claim 5, characterized in that An electromagnetic regulating valve is fixedly installed on the analytical gas transmission pipeline. An exhaust pipeline is fixedly connected to the analytical gas transmission pipeline between the inlet and the outlet of the electromagnetic regulating valve. A remote pressure gauge and a safety valve are fixedly installed on the exhaust pipeline in sequence along the medium flow direction.

7. The tail gas hydrogen production desorption device for reducing the water content of the desorbed gas according to claim 6, characterized in that A bypass pipeline is fixedly connected between the analytical gas transmission pipeline between the exhaust pipeline and the electromagnetic regulating valve and the exhaust pipeline between the safety valve and the analytical gas transmission pipeline. A maintenance standby valve is fixedly installed on the bypass pipeline.

8. The tail gas hydrogen production desorption device for reducing the water content of the desorbed gas according to claim 4 or 6 or 7, characterized in that A first remote temperature measuring instrument is fixedly installed on the first hydrogen pipeline between the vacuum pump and the gas inlet of the upper floating head.

9. The tail gas hydrogen production desorption device for reducing the water content of the desorbed gas according to claim 8, characterized in that A check valve and a second remote temperature measuring instrument are fixedly installed on the second hydrogen pipeline in sequence along the medium flow direction.

10. The tail gas hydrogen production desorption device for reducing the water content of the desorbed gas according to claim 9, characterized in that It also includes a controller. The vacuum pump, the remote pressure gauge, the safety valve, the first remote temperature measuring instrument, and the second remote temperature measuring instrument are all electrically connected to the controller.

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