Device for producing hydrogen from metal splitting water by utilizing geothermal energy

Abstract

The utility model belongs to the technical field of hydrogen preparation, and discloses a device for producing hydrogen from metal splitting water by utilizing geothermal energy, which comprises a heat exchange unit, a flash evaporation unit, a compression unit and a gas-liquid separation unit, the heat exchange unit comprises a production well for storing geothermal energy, a water replenishing assembly, a first heat exchanger and a second heat exchanger; the flash evaporation unit comprises a first flash evaporator, the first flash evaporator is connected with an outlet of the first heat exchanger, the top of the first flash evaporator is connected with the compression unit, and the bottom of the first flash evaporator is connected with the second heat exchanger; the compression unit is arranged between the first flash evaporator and the gas-liquid separation unit; the gas-liquid separation unit comprises a metal splitting water hydrogen production reactor, a condenser and a gas-liquid separator which are connected in sequence. The geothermal energy and water supplementing assembly in the production well is connected with the first heat exchanger for heat exchange, heating of clean water from the normal temperature is omitted, and power consumption is saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydrogen preparation technical field, especially utilize the metal cracking water hydrogen device of making hydrogen of geothermal energy. BACKGROUND

[0002] Geothermal energy refers to the heat resources stored in the earth, which can be used to produce hot water, steam or directly for heating and power generation. Through the flash evaporation technology, the geothermal water is made into saturated steam, which is coupled with the metal water cracking hydrogen production technology, reducing the power consumption of heating and pressurizing water during the original metal water cracking hydrogen production.

[0003] The metal water cracking hydrogen production requires a higher water temperature. The normal temperature and pressure clean water is pressurized to 0.3~1.2MPa, and the temperature is raised to 100~200℃, which consumes a lot of resources. The hydrogen production cost of metal water cracking hydrogen production alone is ideal, but if the cost of heating and pressurizing water is included, the cost is not competitive, and it also causes waste of resources.

[0004] The existing patent (CN216808138U) discloses a metal cracking water vapor hydrogen production system, which realizes metal water cracking hydrogen production, but the steam source boiler needs a lot of power consumption to make water into water vapor required for the reaction, and does not consider the heat utilization of reactor output, which is a serious waste of resources to a large extent. INVENTION CONTENTS

[0005] In view of the above problems, the utility model provides a metal cracking water hydrogen production device using geothermal energy, which comprises a heat exchange unit, a flash evaporation unit, a compression unit and a gas-liquid separation unit.

[0006] The heat exchange unit comprises a production well for storing geothermal energy, a water supplement assembly, a first heat exchanger and a second heat exchanger, and the production well and the water supplement assembly are respectively connected with the inlet of the first heat exchanger.

[0007] The flash evaporation unit comprises a first flash evaporator, which is connected with the outlet of the first heat exchanger, the top of the first flash evaporator is connected with the compression unit, and the bottom of the first flash evaporator is connected with the second heat exchanger.

[0008] The compression unit is arranged between the first flash evaporator and the gas-liquid separation unit.

[0009] The gas-liquid separation unit comprises a metal cracking water hydrogen production reactor, a condenser and a gas-liquid separator connected in sequence, the inlet of the metal cracking water hydrogen production reactor is connected with the compression unit, and the second heat exchanger is arranged between the metal cracking water hydrogen production reactor and the condenser.

[0010] Further, the compression unit comprises a first-stage compressor and a second-stage compressor connected in sequence, the first-stage compressor is connected with the top of the first flash evaporator, and the second-stage compressor is connected with the metal cracking water hydrogen production reactor.

[0011] Further, the water supplement assembly comprises a water supplement pool and a water supply pump connected in sequence, and the water supply pump is connected with the inlet of the first heat exchanger.

[0012] Further, the compression unit further comprises a cooling assembly arranged between the first-stage compressor and the second-stage compressor.

[0013] Further, the flash evaporation unit further comprises a second flash evaporator, the top of the second flash evaporator is connected with the first-stage compressor, the bottom of the second flash evaporator is connected with the water supply pump, and the second heat exchanger is connected with the second flash evaporator.

[0014] Further, the cooling assembly comprises a third heat exchanger arranged between the first-stage compressor and the second-stage compressor, and a cooling pool connected with the third heat exchanger.

[0015] Further, the water supplement assembly further comprises a flow regulating valve arranged between the water supply pump and the first heat exchanger.

[0016] Further, the flash evaporation unit further comprises a pressure reducing valve arranged between the first flash evaporator and the first heat exchanger.

[0017] Further, a recharge well is further included, and the recharge well is connected with the first heat exchanger.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] 1. In the present application, the geothermal energy in the production well is used for heat exchange with the water supplement assembly and the first heat exchanger, so that the clean water is heated from normal temperature, and the power consumption is saved; the first flash evaporator is arranged to gasify the clean water, the steam is pressurized by the first-stage compressor and the second-stage compressor, the pressure is increased to 0.4-1.2 MPa, and then the steam is reacted with the metal cracking water hydrogen production reactor to produce hydrogen.

[0020] 2. In the present application, the second heat exchanger and the second flash evaporator are arranged to perform secondary flash evaporation on the heat-exchanged clean water, the generated steam is pressurized again in the compression unit, and the steam is reacted with the metal cracking water hydrogen production reactor, so that the waste heat in the hydrogen production process is reused, the amount of waste heat recovered is sufficient, the energy network is highly integrated, the waste of energy is avoided, the reaction conditions of the metal cracking water reactor are maintained, and the energy comprehensive utilization rate and the metal cracking water hydrogen production efficiency are improved.

[0021] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures pointed out in the description, claims, and drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A flowchart of the hydrogen production process in an embodiment of this utility model is shown.

[0024] In the diagram, 11 is the production well; 12 is the makeup water tank; 13 is the feed water pump; 14 is the first heat exchanger; 15 is the second heat exchanger; 16 is the flow regulating valve; 21 is the first flash evaporator; 22 is the second flash evaporator; 23 is the pressure reducing valve; 31 is the first stage compressor; 32 is the second stage compressor; 33 is the third heat exchanger; 34 is the cooling tank; 41 is the metal pyrolysis water hydrogen production reactor; 42 is the condenser; 43 is the gas-liquid separator; and 5 is the reinjection well. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] like Figure 1 As shown, a device for producing hydrogen from metal pyrolysis water using geothermal energy includes a heat exchange unit, a flash evaporation unit, a compression unit, and a gas-liquid separation unit.

[0027] The heat exchange unit includes a production well 11 for storing geothermal energy, a water supply component, a first heat exchanger 14, and a second heat exchanger 15. The production well 11 and the water supply component are respectively connected to the inlet of the first heat exchanger 14.

[0028] The flash unit comprises a first flash evaporator 21 connected with the outlet of the first heat exchanger 14, the top of the first flash evaporator 21 is connected with the compression unit, and the bottom of the first flash evaporator 21 is connected with the second heat exchanger 15;

[0029] The compression unit comprises a first-stage compressor 31 and a second-stage compressor 32 connected in sequence, the first-stage compressor 31 is connected with the top of the first flash evaporator 21;

[0030] The gas-liquid separation unit comprises a metal cracking water hydrogen production reactor 41, a condenser 42 and a gas-liquid separator 43 connected in sequence, the inlet of the metal cracking water hydrogen production reactor 41 is connected with the second-stage compressor 32, and the second heat exchanger 15 is arranged between the metal cracking water hydrogen production reactor 41 and the condenser 42.

[0031] The water supplement assembly comprises a water supplement pool 12 and a water supply pump 13 connected in sequence, the water supply pump 13 is connected with the inlet of the first heat exchanger 14, and a flow regulating valve 16 is arranged between the water supply pump 13 and the first heat exchanger 14.

[0032] The heat exchange unit further comprises a third heat exchanger 33 and a cooling pool 34, the third heat exchanger 33 is arranged between the first-stage compressor 31 and the second-stage compressor 32, and the cooling pool 34 is connected with the third heat exchanger 33.

[0033] The above is a complete hydrogen production process, first, the desalted water after softening and deoxidization of the water supplement pool 12 enters the first heat exchanger 14, and the desalted water after softening and deoxidization can effectively reduce the risk of internal scaling and clogging of the equipment. The desalted water after deoxidization can prevent oxidation corrosion on one hand, and in the hydrogen production process, the oxygen dissolved in the water can cause oxidation corrosion to the metal equipment and pipelines, thereby shortening the service life of the equipment; on the other hand, it can prevent the oxidation reaction of oxygen and aluminum in the metal cracking water hydrogen production reactor 41, thereby reducing the occurrence of the side reaction and improving the hydrogen production efficiency.

[0034] After the softening and deoxidization are completed, the flow regulating valve 14 is adjusted to control the flow of the clean water, and then the desalted water is pumped into the first heat exchanger 14 through the water supply pump 13, and the production well 11 connected with the first heat exchanger 14 inputs the geothermal water into the first heat exchanger 14, so that the desalted water and the geothermal water complete the first heat exchange in the first heat exchanger 14, and the desalted water is heated from normal temperature to 50-90℃, thereby saving the energy consumption of heating the desalted water from normal temperature to 50-90℃ by using electric energy.

[0035] Because the impurities contained in the geothermal water are too much, the steam of the geothermal water is not suitable for reacting with the metal in the metal cracking water hydrogen production reactor 41, and the geothermal water is mainly used for completing the heat exchange with the desalted water.

[0036] The liquid water after heat exchange enters the first flash evaporator 21 for flash evaporation. Since the first flash evaporator 21 is provided with a pressure reducing valve 23 between the first heat exchanger 14, the water pressure can be reduced to a vacuum degree of 50-200 kPa, and the boiling point of the water is lowered with the reduction of the pressure, thereby promoting the evaporation process of the water, and part of the water is converted into steam by flash evaporation. The process temperature of the flash evaporation is increased, thereby reducing the energy required for subsequent heating. This way not only improves the energy utilization efficiency, but also helps to reduce the overall energy consumption of the hydrogen production process.

[0037] The steam from the top of the first flash evaporator 21 enters the first-stage compressor 31 for compression, temperature increase and pressure increase. The first-stage compressor 31 is set to a heating temperature of 90-130℃ and a pressure of 0.2-0.4 MPa. In the actual compression process, the temperature difference between the steam after the first-stage compressor 31 and the set temperature is ±1-2℃, and the pressure difference between the steam after the first-stage compressor 31 and the set pressure is ±1%. Then the steam enters the second-stage compressor 32 for secondary compression. The second-stage compressor 32 is set to a heating temperature of 130-200℃ and a pressure of 0.4-1.2 MPa. The temperature and pressure of the steam after the second-stage compressor 32 meet the reaction with the metal aluminum in the metal cracking water hydrogen production reactor 41. The hydrogen and water vapor after the reaction from the top of the metal cracking water hydrogen production reactor 41 pass through the second heat exchanger 15. Since the first flash evaporator 21 is connected to the second heat exchanger 15, and the temperature of the liquid water at the bottom of the first flash evaporator 21 is lower than that of the hydrogen and water vapor from the metal cracking water hydrogen production reactor 41, the hydrogen and water vapor are cooled after heat exchange. The cooled hydrogen and water vapor are cooled again by the condenser 42, and the water vapor becomes liquid water. The liquid water is discharged from the bottom of the gas-liquid separator 43, and the hydrogen is discharged from the top of the gas-liquid separator 43. Thus, the hydrogen production process is completed.

[0038] If the temperature of the steam after compression by the first-stage compressor 31 is greater than the actual temperature difference, the cooling assembly in the compression unit needs to be started. The cooling assembly includes the third heat exchanger 33 and the cooling pool 34. The cooling pool 34 pours cooling water into the third heat exchanger 33 for heat exchange, and the temperature of the steam is cooled to 120-140℃, and then enters the second-stage compressor 32 for temperature increase and pressure increase.

[0039] The flash evaporation unit also includes the second flash evaporator 22. The top of the second flash evaporator 22 is connected to the first-stage compressor 31, the bottom of the second flash evaporator 22 is connected to the feed water pump 13, and the second heat exchanger 15 is connected to the second flash evaporator 22.

[0040] Since a part of the steam enters the first compressor 31 for compression after the first flash evaporator 21 performs flash evaporation, but a part of the liquid water is not vaporized, but the liquid water with heat can be reused, the liquid water with heat flows into the second heat exchanger 15 from the bottom of the first flash evaporator 21, and after cooling through the second heat exchanger 15, enters the second flash evaporator 22 for flash evaporation again, a part of the liquid water is vaporized after flash evaporation, the vaporized steam enters the compression unit to repeat the above hydrogen production process, and after compression, reaches the reaction temperature and pressure, and then reacts with the metal aluminum of the metal water splitting hydrogen production reactor 41, and the above hydrogen production process is repeated. The advantage of the energy recovery and reuse is that the insufficient waste heat recovery is avoided, the energy waste is also avoided, the energy comprehensive utilization rate is improved, and the metal water splitting hydrogen production efficiency is improved.

[0041] After flash evaporation through the second flash evaporator 22, a part of the vaporized liquid water reacts with the metal aluminum of the metal water splitting hydrogen production reactor 41 again, and a part of the liquid water with heat is discharged from the bottom of the second flash evaporator 22, and the liquid water can be directly connected with the water supply pump 13, mixed with an appropriate amount of clean water, and then circulated to exchange heat with the geothermal water.

[0042] The water supply assembly further comprises a flow regulating valve 16 arranged between the water supply pump 13 and the first heat exchanger 14, and the flow regulating valve 16 is used to regulate the flow of the clean water entering the first heat exchanger 14.

[0043] The cracking agent in the metal water splitting hydrogen production reactor 41 comprises a metal mixture of aluminum, zinc, manganese, gallium, ferrocene and potassium.

[0044] The flash evaporation unit comprises a pressure reducing valve 23 arranged between the first heat exchanger 14 and the first flash evaporator 21, and the pressure reducing valve 23 is used to reduce the pressure of the water to 50-200 kpa.

[0045] Further comprising a recharge well 5 connected with the first heat exchanger 14, and the geothermal water after heat exchange is recovered into the recharge well 5 for other use.

[0046] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A device for producing hydrogen from water by metallo-cleavage using geothermal energy, characterized by: The heat exchange unit, the flash evaporation unit, the compression unit and the gas-liquid separation unit are included. The heat exchange unit includes a production well (11) for storing geothermal energy, a water supplement assembly, a first heat exchanger (14) and a second heat exchanger (15), wherein the production well (11) and the water supplement assembly are connected with the inlet of the first heat exchanger (14) respectively. The flash evaporation unit includes a first flash evaporator (21), wherein the first flash evaporator (21) is connected with the outlet of the first heat exchanger (14), the top of the first flash evaporator (21) is connected with the compression unit, and the bottom of the first flash evaporator (21) is connected with the second heat exchanger (15). The compression unit is arranged between the first flash evaporator (21) and the gas-liquid separation unit. The gas-liquid separation unit includes a metal cracking water hydrogen production reactor (41), a condenser (42) and a gas-liquid separator (43) connected in sequence, wherein the inlet of the metal cracking water hydrogen production reactor (41) is connected with the compression unit, and the second heat exchanger (15) is arranged between the metal cracking water hydrogen production reactor (41) and the condenser (42).

2. The device for producing hydrogen by metallo-cleavage of water using geothermal energy according to claim 1, characterized in that: The compression unit includes a first-stage compressor (31) and a second-stage compressor (32) connected in sequence, wherein the first-stage compressor (31) is connected with the top of the first flash evaporator (21), and the second-stage compressor (32) is connected with the metal cracking water hydrogen production reactor (41).

3. The apparatus for producing hydrogen from water by metallo-cleavage using geothermal energy according to claim 1, characterized in that: The water supplement assembly includes a water supplement pool (12) and a water supply pump (13) connected in sequence, wherein the water supply pump (13) is connected with the inlet of the first heat exchanger (14).

4. The apparatus for producing hydrogen from water by metallo-cleavage using geothermal energy according to claim 2, characterized in that: The compression unit further includes a cooling assembly arranged between the first-stage compressor (31) and the second-stage compressor (32).

5. The apparatus for producing hydrogen from water by metallo-cleavage using geothermal energy according to claim 2, characterized in that: The flash evaporation unit further includes a second flash evaporator (22), wherein the top of the second flash evaporator (22) is connected with the first-stage compressor (31), the bottom of the second flash evaporator (22) is connected with the water supply pump (13), and the second heat exchanger (15) is connected with the second flash evaporator (22).

6. The apparatus for producing hydrogen from water by metallo-cleavage using geothermal energy according to claim 4, characterized in that: The cooling assembly includes a third heat exchanger (33) arranged between the first-stage compressor (31) and the second-stage compressor (32), and a cooling pool (34) connected with the third heat exchanger (33).

7. The apparatus for producing hydrogen from water by metallo-cleavage using geothermal energy according to claim 3, characterized in that: The water supplement assembly further includes a flow regulating valve (16) arranged between the water supply pump (13) and the first heat exchanger (14).

8. The apparatus for producing hydrogen from water by metallo-cleavage using geothermal energy according to claim 1, characterized in that: The flash evaporation unit further includes a pressure reducing valve (23) arranged between the first flash evaporator (21) and the first heat exchanger (14).

9. The apparatus for producing hydrogen from water by metallo-cleavage using geothermal energy according to claim 1, characterized in that: A recharging well (5) is further included, wherein the recharging well (5) is connected with the first heat exchanger (14).

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