Hydrogen freezing, purifying and drying device

Abstract

The utility model discloses a hydrogen freezing, purifying and drying device, which relates to the field of hydrogen preparation, and comprises a first gas-water separator, a heat regenerator, a cooling-water machine, a second gas-water separator and a PLC (programmable logic controller) control system, after feed gas is introduced into the first gas-water separator to be separated, the feed gas is discharged from the upper part of the first gas-water separator and is introduced into a tube pass inlet of the heat regenerator; a tube pass outlet of the heat regenerator is connected with an inlet of a cooling-water machine, an outlet of the cooling-water machine is connected with a second gas-water separator, gas is discharged from the upper part of the second gas-water separator after further separation and is introduced into a shell pass inlet of the heat regenerator, and a shell pass outlet of the heat regenerator outputs product gas outwards; a first liquid level meter is arranged in the first gas-water separator, the opening degree of the pneumatic control valve is controlled through a signal, and a second liquid level meter is arranged in the drainage tank. According to liquid level information of the liquid level meter, the PLC control system controls the opening degree of the pneumatic adjusting valve in real time and controls the first pneumatic valve and the second pneumatic valve to be opened and closed at the same time, drained water of the gas-water separator is led into the water tank, and automatic drained water recycling is achieved.

Description

Technical Field

[0001] The utility model relates to the field of hydrogen preparation, in particular to a hydrogen freezing, purification and drying device. Background Art

[0002] The hydrogen produced by the hydrogen production process cannot be used directly in subsequent production due to its low purity and excessive water content. It is necessary to remove the trace oxygen and water contained in the hydrogen and purify the hydrogen before it can be used later. In the prior art, deoxygenation and dehydration of hydrogen are generally achieved through deoxygenation towers and dryers. In addition, cooling and gas-water separation are also involved. Traditional water cooling (i.e., heat dissipation by natural water or cooling water towers) cannot achieve the purpose of high-precision and high-efficiency temperature control, because the heat dissipation of natural water and cooling water towers are inevitably affected by the natural temperature, and the water temperature is low in winter and high in summer. For example, when the temperature is 30°C, it is almost impossible to require the cooling water temperature to reach 10°C, so control in this way is extremely unstable.

[0003] Hydrogen chillers are completely different from general water cooling equipment because they have a completely independent refrigeration system that is not affected by air temperature and environment. The water temperature is adjusted and controlled within the range of 5°C to 30°C, thus achieving high-precision and high-efficiency temperature control. However, the existing gas-water separation system is difficult to achieve automatic drainage and recovery of the separated high-temperature liquid water, while achieving the purpose of reducing the dissolved hydrogen content in the recovered water. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a hydrogen freeze purification and drying device, which has the advantages of simple equipment structure and fewer instruments. Except for necessary instruments such as liquid level gauges, there is no need to equip pressure, temperature, flow and other measuring points, and there is no need to be equipped with a nitrogen purge interface in the frame.

[0005] The purpose of the utility model is achieved through the following technical solutions: This hydrogen freezing purification and drying device includes a first gas-water separator, a regenerator, a chiller, a second gas-water separator and a PLC control system.

[0006] After the raw gas is separated by passing through the first gas-water separator, it is discharged from the upper part of the first gas-water separator and passed into the tube-side inlet of the regenerator. The tube-side outlet of the regenerator is connected to the inlet of the chiller. The outlet of the chiller is connected to the second gas-water separator. After further separation, it is discharged from the upper part of the second gas-water separator and passed into the shell-side inlet of the regenerator. The shell-side outlet of the regenerator outputs product gas to the outside.

[0007] The water outlet at the bottom of the second gas-water separator is connected to the inlet of the drainage tank through the second pneumatic valve, the outlet of the drainage tank is connected to the water tank through the first pneumatic valve, and the water outlet at the bottom of the first gas-water separator is passed into the water tank through the pneumatic regulating valve;

[0008] A first liquid level gauge is arranged in the first gas-water separator, and the first liquid level gauge controls the opening of the pneumatic regulating valve through a signal, and a second liquid level gauge is arranged in the drainage tank;

[0009] The PLC control system performs pneumatic control on the pneumatic regulating valve, the first pneumatic valve, and the second pneumatic valve respectively through pipelines, thereby controlling the opening and closing of the first pneumatic valve and the second pneumatic valve.

[0010] As a further technical solution, the first gas-water separator and the second gas-water separator both include a shell, a feed port is arranged on one side of the top of the shell, an air outlet is arranged on the other side of the top of the shell, a water outlet is arranged at the bottom of the shell, and an inlet baffle is arranged near the feed port in the inner cavity of the shell to make the gas entering from the feed port flow to the side away from the air outlet; a plurality of inclined baffles are also arranged in the inner cavity of the shell, and a vertical baffle is arranged near the air outlet in the inner cavity of the shell to guide the outlet gas.

[0011] As a further technical solution, the water outlet is arranged on the side of the bottom of the shell close to the air outlet, a sewage outlet is arranged on the side of the bottom of the shell close to the feed port, a spare port is arranged at the top of the shell close to the air outlet, and at least one liquid level gauge port is arranged on the outer wall of the shell.

[0012] As a further technical solution, explosion-proof solenoid valves are provided on the connection pipelines between the PLC control system and the pneumatic regulating valve, the first pneumatic valve, and the second pneumatic valve.

[0013] As a further technical solution, a branch line is provided on the connecting pipeline between the pneumatic regulating valve and the PLC control system, and a valve position feedback device is installed on the branch line.

[0014] As a further technical solution, the first liquid level gauge adopts a magnetic flap liquid level gauge, and the second liquid level gauge adopts a float liquid level gauge.

[0015] As a further technical solution, the first liquid level meter and the second liquid level meter are connected to the user's central control room through hard wiring to send liquid level alarm signals.

[0016] As a further technical solution, the chiller is provided with high and low pressure protectors, and the low pressure protection is set to 0.15Mpa, and the high pressure protection is set to 2.3Mpa.

[0017] The beneficial effects of the utility model are:

[0018] 1. The PLC control system controls the opening of the pneumatic regulating valve in real time according to the liquid level information of the liquid level meter, and controls the opening and closing of the first and second pneumatic valves at the same time. The drainage of the first and second gas-water separators is passed into the water tank to realize automatic drainage recovery;

[0019] 2. Multiple folding baffles are set inside the gas-water separator to divert hydrogen and accumulate water droplets to improve the gas-water separation performance of the gas-water separator;

[0020] 3. The liquid level meter is connected to the user's central control room through hard wiring, and sends out high and low liquid level alarm signals in time;

[0021] 4. The chiller is equipped with high and low pressure protectors, which control the high and low pressure of the refrigeration system to ensure the normal operation of the chiller. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the pipeline connection structure of the utility model.

[0023] Figure 2 It is a schematic diagram of the main structure of the first gas-water separator and the second gas-water separator in the utility model.

[0024] Figure 3 It is a left-side structural schematic diagram of the first gas-water separator and the second gas-water separator in the utility model.

[0025] Figure 4 It is a schematic diagram of the structure of the utility model integrated on the skid.

[0026] Explanation of the reference numerals in the accompanying drawings: first gas-water separator 1, regenerator 2, chiller 3, second gas-water separator 4, drain tank 5, first liquid level gauge 6, second liquid level gauge 7, pneumatic regulating valve 8, first pneumatic valve 9, second pneumatic valve 10, water tank 11, PLC control system 12, explosion-proof solenoid valve 13, valve position feedback device 14, shell 15, water outlet 15a, sewage outlet 15b, feed inlet 15c, spare port 15d, gas outlet 15e, inlet baffle 15f, inclined baffle 15g, vertical baffle 15h, liquid level gauge port L1, liquid level gauge port L2. DETAILED DESCRIPTION

[0027] The utility model will be described in detail below with reference to the accompanying drawings:

[0028] Example: As attached Figures 1 to 4 As shown, the hydrogen freeze purification and drying device includes a first gas-water separator 1, a regenerator 2, a chiller 3, a second gas-water separator 4, a drainage tank 5, a first liquid level gauge 6, a second liquid level gauge 7, a pneumatic regulating valve 8, a first pneumatic valve 9, a second pneumatic valve 10, a water tank 11, a PLC control system 12, an explosion-proof solenoid valve 13, a valve position feedback device 14, a shell 15, a water outlet 15a, a sewage outlet 15b, a feed port 15c, a spare port 15d, an air outlet 15e, an inlet baffle 15f, an inclined baffle 15g, a vertical baffle 15h, a liquid level gauge port L1 and a liquid level gauge port L2.

[0029] Reference Figure 1After the raw gas is separated by passing into the first gas-water separator 1, it is discharged from the upper part of the first gas-water separator 1 and passed into the tube-side inlet of the regenerator 2. The tube-side outlet of the regenerator 2 is connected to the inlet of the chiller 3. The outlet of the chiller 3 is connected to the second gas-water separator 4. After further separation, the raw gas is discharged from the upper part of the second gas-water separator 4 and passed into the shell-side inlet of the regenerator 2. The shell-side outlet of the regenerator 2 outputs the product gas to the outside. Furthermore, the water outlet at the lower part of the second gas-water separator 4 is connected to the inlet of the drainage tank 5 through the second pneumatic valve 10, and the outlet of the drainage tank 5 is connected to the water tank 11 through the first pneumatic valve 9. The water outlet at the lower part of the first gas-water separator 1 is passed into the water tank 11 through the pneumatic regulating valve 8, realizing automatic drainage recovery.

[0030] A first liquid level gauge 6 (LIC2011) is provided in the first gas-water separator 1, and the first liquid level gauge 6 controls the opening of the pneumatic regulating valve 8 through a signal, and a second liquid level gauge 7 (LIC2012) is provided in the drainage tank 5. The PLC control system 12 pneumatically controls the pneumatic regulating valve 8 (LV1001), the first pneumatic valve 9 (KV1001), and the second pneumatic valve 10 (KV1002) through pipelines, thereby controlling the opening and closing of the first pneumatic valve 9 and the second pneumatic valve 10.

[0031] like Figure 2 , 3 As shown, the first gas-water separator 1 and the second gas-water separator 4 both include a shell 15, a feed port 15c is arranged on one side of the top of the shell 15, an air outlet 15e is arranged on the other side of the top of the shell 15, a water outlet 15a is arranged at the bottom of the shell 15, and an inlet baffle 15f is arranged near the feed port 15c in the inner cavity of the shell 15, so that the gas entering the feed port 15c flows to the side away from the air outlet 15e. Two inclined baffles 15g are also arranged at intervals in the inner cavity of the shell 15, and a vertical baffle 15h is arranged near the air outlet 15e in the inner cavity of the shell 15 to guide the outgoing gas. The water outlet 15a is arranged on one side of the bottom of the shell 15 near the air outlet 15e, a sewage outlet 15b is arranged on one side of the bottom of the shell 15 near the feed port 15c, a spare port 15d is arranged near the air outlet 15e at the top of the shell 15, and two liquid level gauge ports (L1, L2) are arranged on the outer wall of the shell 15.

[0032] like Figure 1As shown, preferably, an explosion-proof solenoid valve 13 is provided on the connecting pipeline between the PLC control system 12 and the pneumatic regulating valve 8, the first pneumatic valve 9, and the second pneumatic valve 10. A branch is provided on the connecting pipeline between the pneumatic regulating valve 8 and the PLC control system 12, and a valve position feedback device 14 is installed on the branch, and the branch is provided at the front end of the explosion-proof solenoid valve 13. Furthermore, the first liquid level gauge 6 adopts a magnetic flap liquid level gauge, and the second liquid level gauge 7 adopts a float liquid level gauge. The first liquid level gauge 6 and the second liquid level gauge 7 are connected to the user's central control room through hard wiring to facilitate the sending of liquid level alarm signals. The chiller 3 is provided with high and low pressure protectors, and the low pressure protection is set to 0.15Mpa, and the high pressure protection is set to 2.3Mpa.

[0033] The working process of this utility model:

[0034] like Figure 2 As shown, many folding baffles are arranged inside the gas-water separator (including the first gas-water separator 1 and the second gas-water separator 4), and the compressed hydrogen changes its flow direction many times in the separator. Since the suspended water droplets have a large mass and inertia, when the compressed hydrogen encounters the baffle and the flow direction changes, it can bypass the baffle and continue to move forward, and the water droplets will accumulate on the baffle. In addition, the separator formed by the folding baffles has a large flow area, which reduces the kinetic energy of the water droplets. Most of them will condense and finally fall to the bottom of the separator and be discharged centrally after passing through the water removal tank, which effectively improves the gas-water separation performance of the gas-water separator.

[0035] like Figure 1 As shown, the raw hydrogen (raw gas) containing water, high temperature and high pressure passes through the gas-water separator 1 to separate a large amount of liquid water, and the liquid water does not need to be cooled. The separated high-temperature liquid water is automatically drained and recovered, and the content of dissolved hydrogen in the recovered water is reduced. At the same time, the separated water needs to be automatically discharged. The separated gas enters the regenerator 2 for heat exchange and cooling. The cooled gas enters the chiller 3 for further cooling to remove a large amount of liquid water. After passing through the second gas-water separator 4, the separated liquid water is automatically drained and recovered. The dew point of the product hydrogen at 3MPa can reach 5-10℃, and then it is supplied to customers (product gas) through the regenerator 2.

[0036] Before use, fill the water tank 11 in the machine with clean water (you can input water through the water filling port on the machine, and stop after the overflow port overflows). At the same time, open the air bypass valve to exhaust the air in the pipeline. Connect the power supply, start the chiller 3, open the frozen water inlet and outlet valves, check whether the installation pipeline is leaking and whether the power phase sequence is connected correctly, that is, check whether the rotation direction of the water pump in the machine is consistent with the arrow direction; if not, the reverse alarm light will be displayed. After turning off the power supply, swap the power supply wiring (two of the three phases) to prevent excessive pressure difference from damaging the compressor.

[0037] After the equipment is powered on, the opening and closing degree of the pneumatic regulating valve 8 (LV1001) and the opening and closing of the first pneumatic valve 9 (KV1001) and the second pneumatic valve 10 (KV1002) are controlled according to the liquid level values ​​of the first liquid level gauge 6 (LIC2011) and the second liquid level gauge 7 (LIC2012).

[0038] When the measurement value of the second liquid level gauge 7 is lower than the set value, the second pneumatic valve 10 opens and the first pneumatic valve 9 closes. When the measurement value of the first liquid level gauge 6 is higher than the set value, the second pneumatic valve 10 closes and the first pneumatic valve 9 opens. When the measurement value of the second liquid level gauge 7 is lower than the low level alarm setting value, the device alarm prompts the second liquid level gauge 7 to alarm for low level (which can be connected to the owner's central control room through hard wiring). When the measurement value of the second liquid level gauge 7 is higher than the high level alarm setting value, the device alarm prompts the second liquid level gauge 7 to alarm for high level (which can be connected to the owner's central control room through hard wiring).

[0039] The liquid level of the first gas-water separator 1 in the equipment is set to a value, and then the opening and closing degree of the pneumatic control valve LV1001 is controlled according to the measured value of the first liquid level gauge 6. When the measured value and the set value of the first liquid level gauge 6 differ greatly, the opening and closing degree of the pneumatic control valve LV1001 can be controlled by PID regulation to keep the liquid level in the first liquid level gauge 6 within a certain range. When the measured value of the first liquid level gauge 6 is lower than the set value of the low liquid level alarm, the equipment alarm prompts the low liquid level alarm of the first liquid level gauge 6 (which can be connected to the owner's central control room through hard wiring), and when the measured value of the first liquid level gauge 6 is higher than the set value of the high liquid level alarm, the equipment alarm prompts the high liquid level alarm of the first liquid level gauge 6 (which can be connected to the owner's central control room through hard wiring).

[0040] The hydrogen chiller 3 is mainly composed of two systems, the refrigeration system and the frozen water system. The refrigeration system uses imported refrigeration accessories, which are highly reliable and have an automatic protection system. The hydrogen chiller is equipped with high and low pressure protectors, which control the high and low pressures of the refrigeration system to ensure the normal operation of the chiller 3. The settings of the high and low pressure protectors have been set before leaving the factory, with the low pressure protection being 0.15Mpa and the high pressure protection being 2.3Mpa.

[0041] If the pressure in the system exceeds or falls below the set value of the high and low pressure protector, the chiller 3 will automatically shut down, and a corresponding fault alarm light will be displayed on the instrument panel. The device is integrated on a skid (such as Figure 4 It can be moved and used at the place of use, which is very convenient, has perfect running functions, is relatively simple to control, and is easy to operate.

[0042] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and the concept of the utility model should fall within the protection scope of the claims attached to the utility model.

Claims

1. A hydrogen freeze purification and drying device, characterized in that: It comprises a first gas-water separator (1), a heat regenerator (2), a water chiller (3), a second gas-water separator (4) and a PLC control system (12). After the raw gas is passed into the first gas-water separator (1) for separation, the gas is discharged from the upper part of the first gas-water separator (1) and passed into the tube side inlet of the regenerator (2), the tube side outlet of the regenerator (2) is connected to the inlet of the chiller (3), the outlet of the chiller (3) is connected to the second gas-water separator (4), and after further separation, the gas is discharged from the upper part of the second gas-water separator (4) and passed into the shell side inlet of the regenerator (2), and the shell side outlet of the regenerator (2) outputs the product gas to the outside; The water outlet at the bottom of the second gas-water separator (4) is connected to the inlet of the drainage tank (5) through the second pneumatic valve (10), the outlet of the drainage tank (5) is connected to the water tank (11) through the first pneumatic valve (9), and the water outlet at the bottom of the first gas-water separator (1) is passed into the water tank (11) through the pneumatic regulating valve (8); A first liquid level gauge (6) is arranged in the first gas-water separator (1), and the first liquid level gauge (6) controls the opening of the pneumatic regulating valve (8) through a signal, and a second liquid level gauge (7) is arranged in the drainage tank (5); The PLC control system (12) performs pneumatic control on the pneumatic regulating valve (8), the first pneumatic valve (9), and the second pneumatic valve (10) respectively through pipelines, thereby controlling the opening and closing of the first pneumatic valve (9) and the second pneumatic valve (10).

2. The hydrogen freeze purification and drying device according to claim 1, characterized in that: The first gas-water separator (1) and the second gas-water separator (4) both comprise a shell (15); a feed port (15c) is arranged on one side of the top of the shell (15); a gas outlet (15e) is arranged on the other side of the top of the shell (15); a water outlet (15a) is arranged at the bottom of the shell (15); an inlet baffle (15f) is arranged near the feed port (15c) in the inner cavity of the shell (15) so that the gas entering through the feed port (15c) flows to a side away from the gas outlet (15e); a plurality of inclined baffles (15g) are also arranged in the inner cavity of the shell (15); and a vertical baffle (15h) is arranged near the gas outlet (15e) in the inner cavity of the shell (15) so as to guide the outlet gas.

3. The hydrogen freeze purification and drying device according to claim 2, characterized in that: The water outlet (15a) is arranged on one side of the bottom of the shell (15) close to the air outlet (15e), a sewage outlet (15b) is arranged on one side of the bottom of the shell (15) close to the feed port (15c), a spare port (15d) is arranged on the top of the shell (15) close to the air outlet (15e), and at least one liquid level meter port is arranged on the outer wall of the shell (15).

4. The hydrogen freeze purification and drying device according to claim 1, characterized in that: An explosion-proof electromagnetic valve (13) is provided on the connection pipelines between the PLC control system (12) and the pneumatic regulating valve (8), the first pneumatic valve (9), and the second pneumatic valve (10).

5. The hydrogen freeze purification and drying device according to claim 1, characterized in that: A branch line is arranged on the connecting pipeline between the pneumatic regulating valve (8) and the PLC control system (12), and a valve position feedback device (14) is installed on the branch line.

6. The hydrogen freeze purification and drying device according to claim 1, characterized in that: The first liquid level meter (6) is a magnetic flap liquid level meter, and the second liquid level meter (7) is a float liquid level meter.

7. The hydrogen freeze purification and drying device according to claim 1, characterized in that: The first liquid level meter (6) and the second liquid level meter (7) are connected to the user's central control room via hard wiring to send liquid level alarm signals.

8. The hydrogen freeze purification and drying device according to claim 1, characterized in that: The chiller (3) is provided with high and low pressure protectors, and the low pressure protection is set at 0.15 Mpa, and the high pressure protection is set at 2.3 Mpa.

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