CN215446012U - Two-stage cooling hydrogenation system based on natural cold source - Google Patents
Two-stage cooling hydrogenation system based on natural cold source Download PDFInfo
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- CN215446012U CN215446012U CN202121221282.XU CN202121221282U CN215446012U CN 215446012 U CN215446012 U CN 215446012U CN 202121221282 U CN202121221282 U CN 202121221282U CN 215446012 U CN215446012 U CN 215446012U
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P90/45—Hydrogen technologies in production processes
Abstract
The utility model discloses a two-stage cooling hydrogenation system based on a natural cold source, which comprises a high-pressure hydrogen source, wherein the high-pressure hydrogen source is connected with a first heat exchanger through a flow regulating valve, and the first heat exchanger is connected with a hydrogenation machine through a second heat exchanger; the first heat exchanger and the second heat exchanger jointly form a precooling system for carrying out two-stage cooling on the hydrogen. The method can realize the measurement of the elongation values of all the bolts with the measuring holes, is not limited to the installation of the connecting bolt in the vertical direction or the horizontal direction, and can be universally used for connecting bolts installed at any angle; meanwhile, the measurement precision of the elongation value of the bolt can be ensured; the operation is simple, and the measurement efficiency can be greatly improved.
Description
Technical Field
The utility model belongs to the technical field of hydrogenation in a hydrogenation station, and particularly discloses a two-stage cooling hydrogenation system based on a natural cold source.
Background
In order to promote the popularization of the fuel cell vehicle, the construction of related technical facilities such as a hydrogen refueling station is also an important part of the popularization of the hydrogen fuel. In the initial stage of the market, the most mature means of hydrogen storage and transportation is mainly transportation by using a long-tube trailer. At present, there are various hydrogenation technical schemes, one of which is to store hydrogen in a long-tube trailer tube after being pressurized by a compressor in a hydrogenation station high-pressure storage tank. During hydrogenation, hydrogen stored in a high-pressure storage tank of the hydrogenation station passes through the flow regulating valve and then is hydrogenated to the gas cylinder of the fuel cell vehicle through the hydrogenation machine.
For on-vehicle cylinders, there is a clear regulation that the temperature of the gas in the composite cylinder for vehicles cannot exceed 85 ℃. The hydrogen is different from most gases, the hydrogen has inverse Joule Thomson effect in a hydrogenation working interval, the temperature of the gas is obviously increased after heat insulation and throttling, and the temperature rise of the hydrogen after passing through a pressure reducing valve is sometimes as high as 40 ℃. In addition, fill the notes in-process at the gas cylinder, because reasons such as the compression heat effect, hydrogen temperature sharply rises in the gas cylinder, is difficult to the short time and discharges through natural heat dissipation, endangers the gas cylinder safety, influences the hydrogen quality after the hydrogenation to influence the continuation of the journey mileage of car.
SAE J2601-2016 light vehicle hydrogen filling scheme published by SAE of the American society of automotive Engineers recommends that a precooling link is required to be added in a hydrogenation process, the hydrogen temperature is reduced, different temperature grades T40 (-40-30 ℃), T30 and T20 of a hydrogenation station are specified, and higher temperature grades such as T10, T0 and the like can be included in future specifications.
In patent CN 210771436U, it is proposed to perform gradual cooling at the inlet of the compressor, at the outlet of the compressor, before the hydrogenation machine. However, in the patent, all heat exchangers are connected by adopting parallel pipelines, and the inlet temperature of each heat exchanger adopts the lowest hydrogenation demand temperature. This results in a large temperature difference between the cold and hot media in some heat exchangers, such as the compressor outlet heat exchanger, high thermal stress, and large losses in the refrigeration system.
In general, in the currently used hydrogen precooling scheme, a mechanical refrigeration system is generally adopted to cool hydrogen, the temperature span is large, and can be reduced from above ambient temperature (up to 70 ℃ at high temperature) to-40 ℃, the unit load is large, and the energy consumption is large.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the defects in the background technology, and provides a two-stage cooling hydrogenation system based on a natural cold source, which can realize the measurement of the elongation values of all bolts with measuring holes, is not limited to the installation of connecting bolts in the vertical direction or the horizontal direction, and can be universally used for connecting bolts installed at any angle; meanwhile, the measurement precision of the elongation value of the bolt can be ensured; the operation is simple, and the measurement efficiency can be greatly improved.
In order to achieve the technical features, the utility model is realized as follows: a double-stage cooling hydrogenation system based on a natural cold source comprises a high-pressure hydrogen source, wherein the high-pressure hydrogen source is connected with a first heat exchanger through a flow regulating valve, and the first heat exchanger is connected with a hydrogenation machine through a second heat exchanger; the first heat exchanger and the second heat exchanger jointly form a precooling system for carrying out two-stage cooling on the hydrogen.
A first temperature sensor for monitoring the temperature of the hydrogen is arranged on a pipeline between the flow regulating valve and the first heat exchanger; and the outlet of the flow regulating valve is connected with the second inlet of the first heat exchanger, and the second outlet of the first heat exchanger is connected with the fourth inlet of the second heat exchanger.
The first heat exchanger is connected with a natural cold source, the natural cold source is connected with a first inlet of the first heat exchanger, and cooling media of the natural cold source are heated by the first heat exchanger and then discharged through a first outlet.
The cooling medium of the natural cold source adopts an air source, a natural water source or an underground water source.
And a third temperature sensor is arranged between the natural cold source and the first inlet of the first heat exchanger.
The first heat exchanger is connected with a bypass valve in parallel, and whether the first heat exchanger is used or not is determined by controlling the opening and closing state of the bypass valve.
And a second temperature sensor is arranged between the first heat exchanger and the second heat exchanger.
The second heat exchanger is connected with the refrigerating unit, an outlet of the refrigerating unit is connected with a third inlet of the second heat exchanger, and a third outlet of the refrigerating unit is connected with an inlet of the refrigerating unit to form a refrigerating loop;
the refrigerating unit adopts a refrigerant direct cooling system or a secondary refrigerant indirect cooling system.
And a fourth outlet of the second heat exchanger is connected with a hydrogenation machine, and a flow meter, a pressure sensor and a fourth temperature sensor are arranged on the hydrogenation machine.
The utility model has the following beneficial effects:
by the hydrogenation system and the control method, when the temperature T1 of the throttled hydrogen is far greater than the inlet temperature Tc of the natural cold source, the natural cold source is started to carry out primary cooling, the temperature of the hydrogen can be reduced to be close to the ambient temperature, the load of a refrigerating unit is reduced, and the energy consumption is reduced. Meanwhile, when the temperature T1 of the hydrogen after throttling is low and a natural cold source is difficult to utilize, the bypass valve is started, and the increase of energy consumption caused by pressure loss of the hydrogen generated by the first heat exchanger is avoided. In addition, through detecting first grade cooling back hydrogen temperature T2, with nature cold source entry temperature Tc contrast, can carry out nature cold source flow control to realize the cold energy make full use of nature cold source.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a flow chart of a control method of the present invention.
In the figure: the system comprises a high-pressure hydrogen source 1, a flow regulating valve 2, a natural cold source 3, a first heat exchanger 4, a bypass valve 5, a refrigerating unit 6, a second heat exchanger 7, a hydrogenation machine 8, a flowmeter 9, a pressure sensor 10, a first temperature sensor 11, a third temperature sensor 12, a second temperature sensor 13 and a fourth temperature sensor 14;
a first inlet 101, a first outlet 102, a second inlet 103, a second outlet 104, a third inlet 105, a third outlet 106, a fourth inlet 107, a fourth outlet 108.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-2, a two-stage cooling hydrogenation system based on a natural cold source comprises a high-pressure hydrogen source 1, wherein the high-pressure hydrogen source 1 is connected with a first heat exchanger 4 through a flow regulating valve 2, and the first heat exchanger 4 is connected with a hydrogenation machine 8 through a second heat exchanger 7; the first heat exchanger 4 and the second heat exchanger 7 jointly form a precooling system to carry out two-stage cooling on the hydrogen. By adopting the hydrogenation system, the problems of large load and large energy consumption of the conventional hydrogenation precooling system are solved, and the cooling efficiency is greatly improved and the energy consumption is reduced by adopting a two-stage cooling precooling mode.
Further, a first temperature sensor 11 for monitoring the temperature of the hydrogen is arranged on a pipeline between the flow regulating valve 2 and the first heat exchanger 4; the outlet of the flow regulating valve 2 is connected with the second inlet 103 of the first heat exchanger 4, and the second outlet 104 of the first heat exchanger 4 is connected with the fourth inlet 107 of the second heat exchanger 7. The flow control valve 2 can be used to control the flow rate of the initial hydrogen gas, and the first temperature sensor 11 can be used to detect the temperature of the initial hydrogen gas in real time.
Further, the first heat exchanger 4 is connected with the natural cold source 3, the natural cold source 3 is connected with a first inlet 101 of the first heat exchanger 4, and a cooling medium of the natural cold source is heated by the first heat exchanger 4 and then is discharged through a first outlet 102. The natural cold source 3 described above can be used for primary precooling of the hydrogen.
Furthermore, the cooling medium of the natural cold source adopts an air source, a natural water source or an underground water source. The cooling medium effectively reduces the cooling cost, reduces the energy consumption and achieves the good energy-saving purpose.
Preferably, if the air source is the air source, equipment such as a fan and the like is adopted for driving and flow regulation; if the water source is used, a water pump is adopted for driving and flow regulation. The flow of the natural cold source can be increased by increasing the rotating speed of the fan or the water pump, and otherwise, the flow of the natural cold source is reduced.
Further, a third temperature sensor 12 is installed between the natural cold source 3 and the first inlet 101 of the first heat exchanger 4. The third temperature sensor 12 can be used for detecting the temperature of the natural cold source 3, so that whether the bypass valve 5 needs to be opened or not can be conveniently determined subsequently.
Furthermore, the first heat exchanger 4 is connected in parallel with a bypass valve 5, and whether the first heat exchanger 4 is put into use is determined by controlling the opening and closing state of the bypass valve 5. In the specific working process, when the bypass valve 5 is opened, the first heat exchanger 4 stops working, and when the bypass valve 5 is closed, the first heat exchanger 4 is put into work.
Further, a second temperature sensor 13 is installed between the first heat exchanger 4 and the second heat exchanger 7. The second temperature sensor 13 can be used to detect the temperature of the hydrogen gas after the first-stage precooling.
Further, the second heat exchanger 7 is connected to the refrigerating unit 6, an outlet of the refrigerating unit 6 is connected to a third inlet 105 of the second heat exchanger 7, and a third outlet 106 of the refrigerating unit 6 is connected to an inlet of the refrigerating unit 6, so as to form a refrigerating circuit. The circuit described above can form a secondary precooling circuit.
Further, the refrigerating unit 6 adopts a refrigerant direct cooling system or a secondary refrigerant indirect cooling system.
Preferably, when the refrigerant directly cools the system, the refrigerant is the refrigerant per se, and CO is adopted2R404A, etc.; when the secondary refrigerant indirectly cools the system, the secondary refrigerant is the secondary refrigerant and ethylene glycol is adopted.
Further, a fourth outlet 108 of the second heat exchanger 7 is connected to a hydrogenation unit 8, and a flow meter 9, a pressure sensor 10 and a fourth temperature sensor 14 are disposed on the hydrogenation unit 8.
The utility model discloses a control method of a two-stage cooling hydrogenation system based on a natural cold source, which comprises the following steps:
step one, detecting temperature in a system: detecting the hydrogen gas temperature T1 after throttling by the flow rate adjustment valve 2 by the first temperature sensor 11; detecting the hydrogen temperature T2 after the primary cooling by the first heat exchanger 4 by the second temperature sensor 13; detecting the natural cold source inlet temperature Tc by the third temperature sensor 12; detecting the hydrogen gas outlet temperature To by the fourth temperature sensor 14;
step two, opening control of the bypass valve 5: when T1-Tc < DeltaT 1 according to the temperature detected in the step one, the bypass valve 5 is fully opened, and the first heat exchanger 4 is shielded; when T1-Tc > = Delta T1, the bypass valve 5 is closed, and the first heat exchanger 4 is put into use; the value of the delta T1 is 10-20 ℃.
Step three, when the bypass valve 5 is completely closed and T2-Tc is more than delta T3, the flow of the natural cold source is increased; when T2-Tc is less than delta T2, the flow of the natural cold source is reduced, delta T2< = T2-Tc < = delta T3, and the flow of the natural cold source is unchanged;
the value of the delta T2 is 3-8 ℃, the value of the delta T3 is 6-10 ℃, and the following steps are always kept: Δ T1> Δ T3> Δ T2;
for the refrigerating unit 6, when a refrigerant direct cooling system is adopted, the side evaporation temperature of the refrigerating unit = precooling target temperature Tpre-5-10 ℃; for the secondary refrigerant indirect cooling system, the evaporation temperature of the refrigerating unit side = the precooling target temperature Tpre-10-20 ℃.
Claims (9)
1. The utility model provides a doublestage cooling hydrogenation system based on nature cold source which characterized in that: the device comprises a high-pressure hydrogen source (1), wherein the high-pressure hydrogen source (1) is connected with a first heat exchanger (4) through a flow regulating valve (2), and the first heat exchanger (4) is connected with a hydrogenation machine (8) through a second heat exchanger (7); the first heat exchanger (4) and the second heat exchanger (7) jointly form a precooling system to carry out two-stage cooling on the hydrogen.
2. The dual-stage cooling hydrogenation system based on a natural cold source as claimed in claim 1, wherein: a first temperature sensor (11) for monitoring the temperature of the hydrogen is arranged on a pipeline between the flow regulating valve (2) and the first heat exchanger (4); the outlet of the flow regulating valve (2) is connected with the second inlet (103) of the first heat exchanger (4), and the second outlet (104) of the first heat exchanger (4) is connected with the fourth inlet (107) of the second heat exchanger (7).
3. The dual-stage cooling hydrogenation system based on a natural cold source as claimed in claim 1, wherein: the first heat exchanger (4) is connected with the natural cold source (3), the natural cold source (3) is connected with a first inlet (101) of the first heat exchanger (4), and cooling media of the natural cold source are heated by the first heat exchanger (4) and then discharged through a first outlet (102).
4. The dual-stage cooling hydrogenation system based on a natural cold source as claimed in claim 3, wherein: the cooling medium of the natural cold source adopts an air source, a natural water source or an underground water source.
5. The dual-stage cooling hydrogenation system based on a natural cold source as claimed in claim 3, wherein: and a third temperature sensor (12) is arranged between the natural cold source (3) and the first inlet (101) of the first heat exchanger (4).
6. The dual-stage cooling hydrogenation system based on a natural cold source as claimed in claim 1, wherein: the first heat exchanger (4) is connected with a bypass valve (5) in parallel, and whether the first heat exchanger (4) is put into use or not is determined by controlling the opening and closing state of the bypass valve (5).
7. The dual-stage cooling hydrogenation system based on a natural cold source as claimed in claim 1, wherein: and a second temperature sensor (13) is arranged between the first heat exchanger (4) and the second heat exchanger (7).
8. The dual-stage cooling hydrogenation system based on a natural cold source as claimed in claim 1, wherein: the second heat exchanger (7) is connected with the refrigerating unit (6), the outlet of the refrigerating unit (6) is connected with the third inlet (105) of the second heat exchanger (7), the third outlet (106) of the refrigerating unit (6) is connected with the inlet of the refrigerating unit (6), and a refrigerating loop is formed;
the refrigerating unit (6) adopts a refrigerant direct cooling system or a secondary refrigerant indirect cooling system.
9. The dual-stage cooling hydrogenation system based on a natural cold source as claimed in claim 1, wherein: and a fourth outlet (108) of the second heat exchanger (7) is connected with a hydrogenation machine (8), and a flowmeter (9), a pressure sensor (10) and a fourth temperature sensor (14) are arranged on the hydrogenation machine (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121221282.XU CN215446012U (en) | 2021-06-02 | 2021-06-02 | Two-stage cooling hydrogenation system based on natural cold source |
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| CN202121221282.XU CN215446012U (en) | 2021-06-02 | 2021-06-02 | Two-stage cooling hydrogenation system based on natural cold source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113217806A (en) * | 2021-06-02 | 2021-08-06 | 中国长江三峡集团有限公司 | Two-stage cooling hydrogenation system based on natural cold source and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113217806A (en) * | 2021-06-02 | 2021-08-06 | 中国长江三峡集团有限公司 | Two-stage cooling hydrogenation system based on natural cold source and control method |
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