Ionic liquid hydrogen compressor and control strategy thereof

Abstract

The invention discloses an ionic liquid hydrogen compressor and a control strategy thereof, and relates to the technical field of compressors. The compressor comprises a hydraulic oil tank, a radial plunger pump, a first electromagnetic directional valve, a second electromagnetic directional valve, a third electromagnetic directional valve, a first pressure cylinder, a second pressure cylinder, a third pressure cylinder, a first-stage air inlet valve, a first-stage exhaust valve, a second-stage air inlet valve, a second-stage exhaust valve, a third-stage air inlet valve and a third-stage exhaust valve. The pressure range of an inlet of the first-stage air inlet valve is 1-90 MPa, and the pressure range of an outlet of the third-stage exhaust valve is larger than or equal to 90 MPa. In the working process of the compressor, the radial plunger pump sequentially drives the first pressurization cylinder, the second pressurization cylinder and the third pressurization cylinder to work to achieve hydrogen pressurization, when the inlet pressure fluctuates, the compressor can be matched with the corresponding pressurization cylinders in real time to work, and the compressor has the advantages of being wide in pressurization range, high in energy efficiency and low in cost. And the device can be suitable for various variable inlet pressure working conditions. The invention further discloses a control strategy of the compressor.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of compressors, and particularly relates to an ionic liquid hydrogen compressor and a control strategy thereof. BACKGROUND

[0002] Fuel cell vehicles have become the core carrier of hydrogen energy application due to their prospective technical advantages. However, the locally produced diaphragm type hydrogen compressor is faced with technical bottlenecks such as low energy efficiency, high operation and maintenance cost and frequent failures. Specifically, the output pressure of the diaphragm type hydrogen compressor generally stays at 45 MPa, and breaking through the 45 MPa pressure threshold to realize the self-controllable high-end hydrogen compressor has become a technical difficulty to be overcome. SUMMARY

[0003] In order to break the monopoly of developed countries on the technology of ionic liquid hydrogen compressors, the purpose of the present application is to provide a control strategy for an ionic liquid hydrogen compressor, based on which reasonable control of the ionic liquid hydrogen compressor under variable working conditions can be realized.

[0004] In order to achieve the above purpose, on the one hand, the present application provides an ionic liquid hydrogen compressor, which comprises a hydraulic oil tank, a radial piston pump connected to the top of the hydraulic oil tank, and a first electromagnetic reversing valve, a second electromagnetic reversing valve and a third electromagnetic reversing valve connected to the output end of the radial piston pump, respectively; a first plenum chamber is connected to the output port of the first electromagnetic reversing valve, and a first I-shaped piston is installed inside the first plenum chamber, and a first ionic liquid is distributed above the first I-shaped piston; a first stage inlet valve and a first stage outlet valve are installed on the top of the first plenum chamber, a pressure detection unit is connected to the first stage inlet valve, and a low-pressure hydrogen inlet end is connected to the other end of the pressure detection unit.

[0005] A second plenum chamber is connected to the output port of the second electromagnetic reversing valve, a second I-shaped piston is installed inside the second plenum chamber, and a second ionic liquid is distributed above the second I-shaped piston; a second stage inlet valve and a second stage outlet valve are installed on the top of the second plenum chamber, and the second stage inlet valve is connected to the first stage outlet valve.

[0006] A third plenum chamber is connected to the output port of the third electromagnetic reversing valve, a third I-shaped piston is installed inside the third plenum chamber, and a third ionic liquid is distributed above the third I-shaped piston; a third stage inlet valve and a third stage outlet valve are installed on the top of the third plenum chamber, the third stage inlet valve is connected to the second stage outlet valve, and a high-pressure back pressure valve is connected to the other side of the third stage outlet valve.

[0007] The first electromagnetic reversing valve, the second electromagnetic reversing valve and the third electromagnetic reversing valve are all two-position two-way electromagnetic reversing valves.

[0008] The outlet of the first electromagnetic reversing valve, the outlet of the second electromagnetic reversing valve and the outlet of the third electromagnetic reversing valve are all communicated with the hydraulic oil tank.

[0009] The hydrogen inlet pressure range of the low-pressure hydrogen inlet end is 1-90 MPa, the back pressure pressure of the high-pressure back pressure valve is set to 90 MPa, and the pressure increasing ratios of the first pressure increasing cylinder, the second pressure increasing cylinder and the third pressure increasing cylinder are all 4.5.

[0010] In another aspect, the application also provides a control strategy based on the above ion liquid hydrogen compressor, which is: when the pressure detection unit detects that the inlet pressure of the low-pressure hydrogen inlet end is 1-4.5 MPa, the first pressure increasing cylinder, the second pressure increasing cylinder and the third pressure increasing cylinder are sequentially driven to work by the radial piston pump, and the hydrogen gas passing through the third exhaust valve is pressurized to 90 MPa; when the pressure detection unit detects that the inlet pressure of the low-pressure hydrogen inlet end is 4.5-20.25 MPa, the first pressure increasing cylinder is not worked, the first electromagnetic reversing valve is controlled to be electrified, and the hydraulic oil output from the radial piston pump is caused to flow back to the hydraulic oil tank through the outlet of the first electromagnetic reversing valve; when the pressure detection unit detects that the inlet pressure of the low-pressure hydrogen inlet end is 20.25-90 MPa, the first pressure increasing cylinder and the second pressure increasing cylinder are not worked at the same time, the first electromagnetic reversing valve and the second electromagnetic valve are controlled to be electrified, and the hydraulic oil output from the radial piston pump is caused to flow back to the hydraulic oil tank through the outlet of the first electromagnetic reversing valve and the outlet of the second electromagnetic reversing valve; when the pressure detection unit detects that the inlet pressure of the low-pressure hydrogen inlet end is greater than or equal to 90 MPa, the first pressure increasing cylinder, the second pressure increasing cylinder and the third pressure increasing cylinder are not worked, the first electromagnetic reversing valve, the second electromagnetic valve and the third electromagnetic valve are controlled to be electrified, and the hydraulic oil output from the radial piston pump is caused to flow back to the hydraulic oil tank through the outlet of the first electromagnetic reversing valve, the outlet of the second electromagnetic reversing valve and the outlet of the third electromagnetic reversing valve.

[0011] Compared with the prior art, the application has the following beneficial effects:

[0012] The hydrogen inlet pressure range in the application is very wide, which is suitable for various working conditions, and has very good adaptability under variable working conditions. Not only the monopoly of the ion liquid hydrogen compressor technology in developed countries is broken, but also the demand of China for the ion liquid hydrogen compressor technology is met. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic view of the ion liquid hydrogen compressor. DETAILED DESCRIPTION

[0014] The application will be further described in detail below with reference to the accompanying drawings.

[0015] Referring to Figure 1 The ion liquid hydrogen compressor comprises a hydraulic oil tank 11, a radial plunger pump 12 connected to the top of the hydraulic oil tank 11, and a first electromagnetic reversing valve 13, a second electromagnetic reversing valve 14 and a third electromagnetic reversing valve 15 connected to the output end of the radial plunger pump 12 respectively. A first supercharging cylinder 21 is connected to the output port 132 of the first electromagnetic reversing valve, and a first I-shaped piston 22 is arranged in the first supercharging cylinder 21. The first I-shaped piston 22 is distributed with first ion liquid 23 above. A first-stage intake valve 24 and a first-stage exhaust valve 25 are arranged on the top of the first supercharging cylinder 21. A pressure detection unit 26 is connected to the first-stage intake valve 24, and a low-pressure hydrogen inlet end 27 is connected to the other end of the pressure detection unit 26.

[0016] A second supercharging cylinder 31 is connected to the output port 142 of the second electromagnetic reversing valve, and a second I-shaped piston 32 is arranged in the second supercharging cylinder 31. The second I-shaped piston 32 is distributed with second ion liquid 33 above. A second-stage intake valve 34 and a second-stage exhaust valve 35 are arranged on the top of the second supercharging cylinder 31, and the second-stage intake valve 34 is connected to the first-stage exhaust valve 25.

[0017] A third supercharging cylinder 41 is connected to the output port 152 of the third electromagnetic reversing valve, and a third I-shaped piston 42 is arranged in the third supercharging cylinder 41. The third I-shaped piston 42 is distributed with third ion liquid 43 above. A third-stage intake valve 44 and a third-stage exhaust valve 45 are arranged on the top of the third supercharging cylinder 41, and the third-stage intake valve 44 is connected to the second-stage exhaust valve 35. The other side of the third-stage exhaust valve 45 is connected to a high-pressure back pressure valve 46.

[0018] The first electromagnetic reversing valve 13, the second electromagnetic reversing valve 14 and the third electromagnetic reversing valve 15 are all two-position two-way electromagnetic reversing valves.

[0019] The input port 131 of the first electromagnetic reversing valve, the output port 133 of the first electromagnetic reversing valve, the input port 141 of the second electromagnetic reversing valve, the output port 143 of the second electromagnetic reversing valve, the input port 151 of the third electromagnetic reversing valve and the output port 153 of the third electromagnetic reversing valve are all connected to the hydraulic oil tank 11.

[0020] The hydrogen inlet pressure range of the low-pressure hydrogen inlet end 27 is 1MPa-90Mpa, the back pressure of the high-pressure back pressure valve 46 is set to 90Mpa, and the supercharging ratio of the first supercharging cylinder 21, the second supercharging cylinder 31 and the third supercharging cylinder 41 is 4.5.

[0021] On the other hand, the application also provides a control strategy based on the above-mentioned ion liquid hydrogen compressor:

[0022] When the pressure detection unit 26 detects that the inlet pressure of the low-pressure hydrogen inlet 27 is 1 to 4.5 MPa, the first booster cylinder 21, the second booster cylinder 31, and the third booster cylinder 41, under the action of the radial piston pump 12, sequentially push the first I-shaped piston 22, the second I-shaped piston 32, and the third I-shaped piston 42 to work, and the hydrogen gas passing through the third-stage exhaust valve 45 is boosted to 90 MPa.

[0023] When the pressure detection unit 26 detects that the inlet pressure of the low-pressure hydrogen inlet 27 is 4.5 to 20.25 MPa, the first I-shaped piston 22 of the first booster cylinder 21 does not work, controls the first electromagnetic reversing valve 13 to be energized, and causes the hydraulic oil output from the radial piston pump 12 to flow back to the hydraulic oil tank 11 through the outlet 133 of the first electromagnetic reversing valve.

[0024] When the pressure detection unit 26 detects that the inlet pressure of the low-pressure hydrogen inlet 27 is 20.25-90 MPa, the first I-shaped piston 22 of the first booster cylinder 21 and the second I-shaped piston 32 of the second booster cylinder 31 simultaneously stop working, controlling the first solenoid directional valve 13 and the second solenoid valve 14 to be energized, causing the hydraulic oil output from the radial piston pump 12 to flow back to the hydraulic oil tank 11 through the outlet 133 of the first solenoid directional valve 13 and the outlet 143 of the second solenoid directional valve.

[0025] When the pressure detection unit 26 detects that the inlet pressure of the low-pressure hydrogen inlet 27 is greater than or equal to 90MPa, the first I-shaped piston 22 of the first booster cylinder 21, the second I-shaped piston 32 of the second booster cylinder 31, and the third I-shaped piston 42 of the third booster cylinder 41 all stop working, and the first solenoid directional valve 13, the second solenoid valve 14, and the third solenoid valve 15 are all energized, causing the hydraulic oil output from the radial piston pump 12 to flow back to the hydraulic oil tank 11 through the outlet 133 of the first solenoid directional valve, the outlet 143 of the second solenoid directional valve, and the outlet 153 of the third solenoid directional valve.

Claims

1. An ionic liquid hydrogen compressor, comprising a hydraulic oil tank (11), a radial piston pump (12) connected to the top of the hydraulic oil tank (11), and a first electromagnetic reversing valve (13), a second electromagnetic reversing valve (14) and a third electromagnetic reversing valve (15) connected to the output end of the radial piston pump (12) respectively; a first plenum chamber (21) is connected to the output port (132) of the first electromagnetic reversing valve, a first I-shaped piston (22) is installed inside the first plenum chamber (21), and a first ionic liquid (23) is distributed above the first I-shaped piston (22); a first stage intake valve (24) and a first stage exhaust valve (25) are installed on the top of the first plenum chamber (21), a pressure detection unit (26) is connected to the first stage intake valve (24), and a low-pressure hydrogen inlet end (27) is connected to the other end of the pressure detection unit (26); a second plenum chamber (31) is connected to the output port (142) of the second electromagnetic reversing valve, a second I-shaped piston (32) is installed inside the second plenum chamber (31), and a second ionic liquid (33) is distributed above the second I-shaped piston (32); a second stage intake valve (34) and a second stage exhaust valve (35) are installed on the top of the second plenum chamber (31), and the second stage intake valve (34) is connected to the first stage exhaust valve (25); a third plenum chamber (41) is connected to the output port (152) of the third electromagnetic reversing valve, a third I-shaped piston (42) is installed inside the third plenum chamber (41), and a third ionic liquid (43) is distributed above the third I-shaped piston (42); a third stage intake valve (44) and a third stage exhaust valve (45) are installed on the top of the third plenum chamber (41), the third stage intake valve (44) is connected to the second stage exhaust valve (35), and a high-pressure back pressure valve (46) is connected to the other side of the third stage exhaust valve (45); the first electromagnetic reversing valve (13), the second electromagnetic reversing valve (14) and the third electromagnetic reversing valve (15) are all two-position two-way electromagnetic reversing valves; the outlet (133) of the first electromagnetic reversing valve, the outlet (143) of the second electromagnetic reversing valve and the outlet (153) of the third electromagnetic reversing valve are all connected to the hydraulic oil tank (11); the hydrogen inlet pressure range of the low-pressure hydrogen inlet end (27) is 1 MPa to 90 MPa, the back pressure of the high-pressure back pressure valve (46) is set to 90 MPa, and the pressure ratio of the first plenum chamber (21), the second plenum chamber (31) and the third plenum chamber (41) is 4.

5.

2. A control strategy for the ionic liquid hydrogen compressor according to claim 1, characterized in that: when the pressure detection unit (26) detects that the inlet pressure of the low-pressure hydrogen inlet end (27) is 1-4.5 MPa, the first plenum chamber (21), the second plenum chamber (31) and the third plenum chamber (41) are sequentially driven by the radial piston pump (12) to drive the first I-shaped piston (22), the second I-shaped piston (32) and the third I-shaped piston (42) to work, and the hydrogen gas passing through the third stage exhaust valve (45) is pressurized to 90 MPa. When the pressure detection unit (26) detects that the inlet pressure of the low-pressure hydrogen gas inlet end (27) is 4.5-20.25 MPa, the first I-shaped piston (22) of the first booster cylinder (21) does not work, the first electromagnetic switching valve (13) is controlled to be energized, and the hydraulic oil output from the radial piston pump (12) is caused to flow back to the hydraulic oil tank (11) through the outlet (133) of the first electromagnetic switching valve; When the pressure detection unit (26) detects that the inlet pressure of the low-pressure hydrogen gas inlet end (27) is 20.25-90 MPa, the first I-shaped piston (22) of the first booster cylinder (21) and the second I-shaped piston (32) of the second booster cylinder (31) do not work at the same time, the first electromagnetic switching valve (13) and the second electromagnetic valve (14) are controlled to be energized, and the hydraulic oil output from the radial piston pump (12) is caused to flow back to the hydraulic oil tank (11) through the outlet (133) of the first electromagnetic switching valve and the outlet (143) of the second electromagnetic valve; When the pressure detection unit (26) detects that the inlet pressure of the low-pressure hydrogen gas inlet end (27) is greater than or equal to 90 MPa, the first I-shaped piston (22) of the first booster cylinder (21), the second I-shaped piston (32) of the second booster cylinder (31), and the third I-shaped piston (42) of the third booster cylinder (41) do not work, the first electromagnetic switching valve (13), the second electromagnetic valve (14), and the third electromagnetic valve (15) are controlled to be energized, and the hydraulic oil output from the radial piston pump (12) is caused to flow back to the hydraulic oil tank (11) through the outlet (133) of the first electromagnetic switching valve, the outlet (143) of the second electromagnetic valve, and the outlet (153) of the third electromagnetic valve.

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