CN116288403A - Natural gas pressure energy utilization method and natural gas pressure energy utilization device - Google Patents

Natural gas pressure energy utilization method and natural gas pressure energy utilization device Download PDF

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Publication number
CN116288403A
CN116288403A CN202310086016.8A CN202310086016A CN116288403A CN 116288403 A CN116288403 A CN 116288403A CN 202310086016 A CN202310086016 A CN 202310086016A CN 116288403 A CN116288403 A CN 116288403A
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natural gas
heat
energy
pressure energy
electrolyte
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郑开云
张学锋
池捷成
徐振宇
马雷
陶林
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Shijia Toubo Chengdu Technology Co ltd
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Shijia Toubo Chengdu Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • F01K27/02—Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/50—Processes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C25B15/085—Removing impurities
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C25B15/087—Recycling of electrolyte to electrochemical cell
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/60—Constructional parts of cells
    • C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

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  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Abstract

The invention discloses a natural gas pressure energy utilization method and a natural gas pressure energy utilization device. The natural gas pressure energy utilization method of the invention comprises the following steps: s1: converting pressure energy of natural gas into mechanical energy and using the mechanical energy to produce electrical energy; s2: electrolyzing the electrolyte by utilizing the electric energy and other electric energy to generate a gas-liquid mixture; s3: separating the gas-liquid mixture to obtain high-temperature electrolyte and gas; s4: the natural gas prior to use in power generation is preheated with at least a portion of the high temperature electrolyte to increase the pressure energy of the natural gas and reduce the electrolyte temperature. The natural gas pressure energy utilization device comprises a power generation device, an electrolysis device and a heat exchange device. The invention utilizes the pressure energy of natural gas to generate electricity, and uses the electrolysis waste heat to preheat natural gas, thereby improving the generated energy and recovering the waste heat, and can convey and use hydrogen energy in a natural gas pipeline hydrogen-adding mode, thereby realizing the closed loop of the utilization of the residual pressure waste heat hydrogen energy.

Description

Natural gas pressure energy utilization method and natural gas pressure energy utilization device
Technical Field
The invention relates to the technical field of energy recycling, in particular to a natural gas pressure energy utilization method and a natural gas pressure energy utilization device based on the method.
Background
The recovery and utilization of the waste heat and the residual pressure energy are one of important contents in the field of industrial energy conservation, and the scientific and reasonable utilization of the waste heat and the residual pressure energy is significant for achieving the national energy conservation and emission reduction targets.
At present, the natural gas conveying pipe network in China is huge in scale, and the natural gas generally has higher pressure in the process of conveying through a pipeline, namely, has larger volume and high-quality pressure energy. When the natural gas is transported to a user side, the natural gas is often required to be depressurized through a pressure regulating device, and the pressure energy of the natural gas in the depressurization process cannot be utilized, so that a large amount of energy is lost.
Disclosure of Invention
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
on one hand, the pressure energy of natural gas can be used for producing electric energy through a power generation device, on the other hand, the development of the hydrogen energy industry needs more green hydrogen sources, and general green hydrogen is produced through photoelectricity and wind power, so that space-time limitation of photoelectricity and wind power is larger, and the transportation difficulty of hydrogen is high and the cost is high.
Accordingly, the inventor considers that the pressure energy of the natural gas can be utilized to produce electric energy, and then the electric energy produced by the natural gas and other electric energy, such as distributed photovoltaic, wind power and the like, are utilized to electrolyze water to produce hydrogen. In addition, because a large amount of waste heat can be generated in the electrolysis process, the waste heat can be used for preheating the natural gas before power generation to improve the power generation capacity of the natural gas, and hydrogen generated by electrolysis can be directly mixed into a natural gas pipeline to be conveyed to downstream users.
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the embodiment of the invention provides a natural gas pressure energy utilization method which can recover and utilize the pressure energy of natural gas.
The embodiment of the invention also provides a natural gas pressure energy utilization device which can recover and utilize the pressure energy of the natural gas.
The natural gas pressure energy utilization method provided by the embodiment of the invention comprises the following steps of:
s1: converting pressure energy of natural gas into mechanical energy and using the mechanical energy to produce electrical energy;
s2: electrolyzing the electrolyte by utilizing the electric energy and generating a gas-liquid mixture;
s3: separating the gas-liquid mixture to obtain high-temperature electrolyte and gas;
s4: the natural gas prior to use in power generation is preheated with at least a portion of the high temperature electrolyte to increase the pressure energy of the natural gas and reduce the electrolyte temperature.
In some embodiments, the method comprises the steps of:
a1: purifying the gas to obtain hydrogen;
a2: regulating the pressure of the hydrogen;
a3: and (3) mixing the hydrogen after pressure regulation into the upstream and/or downstream of the natural gas.
In some embodiments, step S4 further comprises the steps of:
monitoring the preheating heat required by the natural gas before power generation and the electrolysis heat in the high-temperature electrolyte;
if the preheating heat is smaller than the electrolysis heat, storing part of heat in the high-temperature electrolyte; and if the preheating heat is larger than the electrolysis heat, using the heat in the stored high-temperature electrolyte to preheat the natural gas before power generation.
In some embodiments, the preheating heat is obtained by monitoring a flow parameter and/or a temperature parameter of the natural gas prior to power generation.
In some embodiments, when the flow parameter decreases and/or the temperature parameter increases, then decreasing the flow ratio of the high temperature electrolyte for preheating the natural gas and increasing the flow ratio of the high temperature electrolyte for storing heat; when the flow parameter increases and/or the temperature parameter decreases, the flow rate ratio of the high-temperature electrolyte for preheating the natural gas is increased and the flow rate ratio of the high-temperature electrolyte for storing heat is decreased.
The natural gas pressure energy utilization device comprises a power generation device, an electrolysis device and a heat exchange device, wherein the power generation device is used for converting the pressure energy of natural gas into electric energy; the electrolysis device is connected with the power generation device and is used for electrolyzing electrolyte by utilizing the electric energy; the heat exchange device includes a heat absorbing side for absorbing waste heat generated by the electrolyzer and a heat releasing side for using the waste heat to preheat the natural gas upstream of the power generator.
In some embodiments, the electrolysis device comprises an electrolysis cell for decomposing the electrolyte into hydrogen or oxygen, a separation device, and a circulation line; the separation device is connected with the electrolytic tank and is used for separating high-temperature electrolyte in the hydrogen and the oxygen; the circulating pipeline is sequentially connected with the separating device, the heat exchange device and the electrolytic tank, and is used for conveying the high-temperature electrolyte to the heat exchange device to preheat the natural gas and conveying the high-temperature electrolyte after heat exchange back to the electrolytic tank.
In some embodiments, the natural gas pressure energy utilizing device comprises a heat storage device connected to the circulation line and connected in parallel with the heat exchange device, and the heat storage device is configured to store heat of the high-temperature electrolyte from the separation device or to supply the stored heat of the high-temperature electrolyte to the heat exchange device to preheat the natural gas.
In some embodiments, the power generation device is an expansion generator for converting the pressure energy of the natural gas into mechanical energy and then converting the mechanical energy into the electrical energy.
In some embodiments, the natural gas pressure energy utilizing means comprises a purifying means connected to the separating means and for purifying the hydrogen gas.
The natural gas pressure energy utilization method and the natural gas pressure energy utilization device provided by the embodiment of the invention have the following technical effects:
1. the natural gas pressure energy is converted into electric energy, so that the recycling of the pressure energy in the natural gas pipe network is realized, and the problem of waste of the natural gas pressure energy can be solved.
2. The electric energy is used for electrolysis, and the high-temperature electrolyte generated in the electrolysis process is used for preheating the natural gas, so that the generated energy of the natural gas can be improved, and the waste heat in the electrolysis process is recycled. In addition, the natural gas is preheated, so that the natural gas temperature is prevented from being too low after power generation, and the subsequent conveying and use of the natural gas are prevented from being influenced.
3. The hydrogen generated in the electrolysis process can be directly used on site or doped into a natural gas pipeline, and the hydrogen doped into the natural gas pipeline can reduce carbon emission of downstream gas users, so that the closed loop of residual pressure waste heat hydrogen energy utilization is realized.
Drawings
FIG. 1 is a schematic diagram of a natural gas pressure energy utilizing device in accordance with an embodiment of the present invention.
Reference numerals:
1. an expansion generator; 2. an electrolytic cell; 3. a preheater; 4. a hydrogen separator; 5. an oxygen separator; 6. a circulation line; 7. a circulation pump; 8. a heat storage device; 9. a purifier; 10. a voltage regulator.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The natural gas pressure energy utilization method provided by the embodiment of the invention comprises the following steps of:
s1: the pressure energy of natural gas is converted into mechanical energy and the mechanical energy is used to produce electrical energy. Specifically, an expander or turbine may be utilized to convert the pressure energy of the natural gas into mechanical energy and then a generator is coupled to an output shaft of the expander or turbine to produce electrical energy.
S2: the electrolyte is electrolyzed using electrical energy and a gas-liquid mixture is produced. In particular, in addition to electrolysis using electric energy produced by the generator, electrolysis may also be performed using part of the electric energy from the grid, or distributed photovoltaic, wind power, etc. may also be used. The electrolysis process can be carried out in an electrolytic tank, electrolyte is filled in the electrolytic tank, the electrolyte can be aqueous solution, and the cathode and the anode can respectively generate hydrogen and oxygen in the process of electrolyzing the aqueous solution.
S3: and separating the gas-liquid mixture to obtain the high-temperature electrolyte and the gas. Hydrogen and oxygen can carry a part of the high-temperature electrolyte when escaping from the electrolytic tank, and the part of the high-temperature electrolyte can be separated by a separator.
S4: the natural gas before power generation is preheated by at least part of the high-temperature electrolyte so as to improve the pressure energy of the natural gas and reduce the temperature of the electrolyte. Specifically, the separated high-temperature electrolyte can be conveyed to the natural gas pipeline before power generation by utilizing the pipeline, and the natural gas is heated by utilizing the high-temperature electrolyte.
The natural gas pressure energy utilization method provided by the embodiment of the invention has the following technical effects: the pressure energy of the natural gas is converted into mechanical energy and then into electric energy, so that the recycling of the pressure energy of the natural gas is realized. The method has the advantages that a large amount of waste heat generated in the electrolysis process is used for preheating the natural gas, so that the waste heat is recycled, the generated energy of the natural gas can be improved, and the comprehensive utilization rate of energy is further improved. In addition, the preheating of the natural gas can also avoid the influence on the subsequent transportation and use of the natural gas due to the excessively low natural gas temperature after power generation. The hydrogen produced in the electrolysis process can be used as a source of green hydrogen and can be doped into a natural gas pipeline, and the hydrogen doped into the natural gas pipeline indirectly reduces the transportation cost and can reduce the carbon emission in the use process of the natural gas.
In some embodiments, the method comprises the steps of: a1: purifying the gas to obtain hydrogen; a2: regulating the pressure of the hydrogen; a3: the hydrogen after pressure regulation is incorporated upstream and/or downstream of the natural gas. The purification of the gas aims at removing impurities in the hydrogen and the pressure regulation aims at enabling the pressure of the hydrogen to be consistent with the natural gas pressure in a natural gas pipe network. The hydrogen is doped into the natural gas, so that carbon emission during combustion of the low natural gas can be reduced, and energy conservation and emission reduction are facilitated.
In some embodiments, step S4 further comprises the steps of: monitoring the preheating heat required by the natural gas before power generation and the electrolysis heat in the high-temperature electrolyte; if the preheating heat is smaller than the electrolysis heat, storing the heat in the part of high-temperature electrolyte; if the preheating heat is larger than the electrolysis heat, the heat in the stored high-temperature electrolyte is used for preheating the natural gas before power generation.
Specifically, the preheating heat can be monitored by monitoring relevant gas parameters of the natural gas, and the electrolysis heat can be monitored by monitoring temperature parameters, flow parameters and the like of the high-temperature electrolyte. Storing the excess electrolysis heat when the preheating heat is less than the electrolysis heat avoids wasting energy, and the stored electrolysis heat can be used to supplement natural gas when the preheating heat is greater than the electrolysis heat. By the method for storing heat, the electrolysis heat can be effectively utilized, waste of the electrolysis heat is reduced, and the natural gas power generation process is stable.
In some embodiments, the preheating heat is obtained by monitoring a flow parameter and/or a temperature parameter of the natural gas prior to power generation. The temperature parameter of the natural gas can reflect the pressure energy of the natural gas in unit volume, the flow parameter can directly reflect the amount of the preheating energy required by the natural gas, and the two parameters can accurately reflect the preheating heat required by the natural gas.
In some embodiments, when the flow parameter decreases and/or the temperature parameter increases, the flow ratio of the high temperature electrolyte for preheating natural gas is decreased and the flow ratio of the high temperature electrolyte heat for storing heat is increased; when the flow parameter is increased and/or the temperature parameter is decreased, the flow rate of the high-temperature electrolyte for preheating the natural gas is increased and the flow rate of the high-temperature electrolyte for storing heat is decreased.
As the flow parameter decreases and/or the temperature parameter increases, more of the electrolysis energy may be stored for use; when the flow parameter is increased and/or the temperature parameter is decreased, the stored electrolysis energy can be reduced, and the electrolysis energy can be directly used for preheating the natural gas so as to improve the power generation of the natural gas.
The natural gas pressure energy utilization device of the embodiment of the present invention is described below.
As shown in fig. 1, the natural gas pressure energy utilization device according to the embodiment of the present invention includes a power generation device, an electrolysis device, and a heat exchange device.
The power generation device is used for converting pressure energy of natural gas into electric energy. Specifically, the power generation device may be an expansion power generator 1, and the expansion power generator 1 may be disposed at a natural gas pipe network and generate power by using pressure energy of natural gas.
The electrolysis device is connected with the power generation device, and the electrolysis device utilizes electric energy to electrolyze the electrolyte. The electrolysis device can comprise an electrolysis tank 2, the electrolyte can be aqueous solution, and hydrogen and oxygen can be obtained by electrolyzing the aqueous solution through electric energy. The electrolytic tank 2 can perform electrolysis by using both the electric energy produced by the expansion generator 1 and the electric energy of the electric network.
The heat exchange device comprises a heat absorption side and a heat release side, wherein the heat absorption side is used for absorbing waste heat generated by the electrolysis device, and the heat release side is used for preheating natural gas upstream of the power generation device by using the waste heat. The heat exchange means may comprise a preheater 3, the preheater 3 using the waste heat generated by the electrolysis means for heating natural gas.
The natural gas pressure capacity utilization device provided by the embodiment of the invention has the following technical effects: the power generation device converts the pressure energy of the natural gas into electric energy, so that the recycling of the pressure energy of the natural gas is realized. The natural gas can be preheated through the heat exchange device by a large amount of waste heat generated by the electrolysis device, and the process not only recycles the waste heat, but also can improve the generated energy of the natural gas, thereby improving the comprehensive utilization rate of energy. In addition, the natural gas is preheated through the heat exchange device, so that the influence on the subsequent conveying and use of the natural gas due to the fact that the natural gas temperature is too low after power generation can be avoided. The hydrogen produced by the electrolysis device can be stored and used, and can be doped into a natural gas pipeline, and the hydrogen doped into the natural gas pipeline indirectly reduces the transportation cost of the hydrogen and can reduce the carbon emission in the use process of the natural gas.
In some embodiments, as shown in fig. 1, the electrolysis device comprises an electrolysis cell 2, a separation device and a circulation line 6, the electrolysis cell 2 being used to decompose the electrolyte into hydrogen and oxygen; the separation device is connected with the electrolytic tank 2 and is used for separating high-temperature electrolyte in hydrogen and oxygen; the circulating pipeline 6 is sequentially connected with the separating device, the heat exchange device and the electrolytic tank 2, and the circulating pipeline 6 is used for conveying the high-temperature electrolyte to the heat exchange device to preheat natural gas and conveying the high-temperature electrolyte after heat exchange back to the electrolytic tank 2.
The electrolytic tank 2 can be an alkaline water electrolytic tank 2, the operation temperature of the alkaline water electrolytic tank 2 is 80-90 ℃, and a cathode and an anode are arranged in the electrolytic tank 2 and respectively generate hydrogen and oxygen. The separation device may include a hydrogen separator 4 for separating a hydrogen-high temperature electrolyte mixture generated at the cathode, and an oxygen separator 5 for separating an oxygen-high temperature electrolyte generated at the anode, the hydrogen separator 4. The circulation pipeline 6 can be provided with a circulation pump 7, the temperature of the high-temperature electrolyte separated by the separation device is 80-90 ℃, the high-temperature electrolyte can be conveyed to the preheater 3 through the circulation pipeline 6, heat exchange is carried out between the high-temperature electrolyte and natural gas in the preheater 3, the temperature of the high-temperature electrolyte after heat exchange is reduced, and the high-temperature electrolyte returns to the electrolytic tank 2 through the circulation pipeline 6.
In other embodiments, the electrolyzer 2 may also be a proton exchange membrane electrolyzer 2.
In some embodiments, as shown in fig. 1, the natural gas pressure energy utilizing apparatus includes a heat storage device 8, the heat storage device 8 is connected to the circulation line 6 and connected in parallel with the heat exchanging device, and the heat storage device 8 is used to store heat of the high temperature electrolyte from the separating device or to supply the stored heat of the high temperature electrolyte to the heat exchanging device to preheat the natural gas. The heat storage device 8 avoids waste of heat in the high-temperature electrolyte and can balance preheating heat required by natural gas and electrolysis heat generated by the electrolysis device.
In other embodiments, the heat storage device 8 may also use water or a phase change material as a heat storage medium, through which heat in the high-temperature electrolyte is stored.
In some embodiments, as shown in fig. 1, the power generation device is an expansion power generator 1, and the expansion power generator 1 is configured to convert the pressure energy of the natural gas into mechanical energy, and then convert the mechanical energy into the electrical energy.
In some embodiments, as shown in FIG. 1, the natural gas pressure energy utilizing device includes a purification device coupled to the separation device and configured to purify the gas into hydrogen. The purification device may be a purifier 9, and the purifier 9 is used for removing impurities in the hydrogen. Purified hydrogen can be stored for use or can be mixed into natural gas pipelines after pressure regulation by the pressure regulator 10.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. A method for utilizing natural gas pressure energy, comprising the steps of:
s1: converting pressure energy of natural gas into mechanical energy and using the mechanical energy to produce electrical energy;
s2: electrolyzing the electrolyte by utilizing the electric energy and generating a gas-liquid mixture;
s3: separating the gas-liquid mixture to obtain high-temperature electrolyte and gas;
s4: the natural gas prior to use in power generation is preheated with at least a portion of the high temperature electrolyte to increase the pressure energy of the natural gas and reduce the electrolyte temperature.
2. The method of using natural gas pressure energy according to claim 1, comprising the steps of:
a1: purifying the gas to obtain hydrogen;
a2: regulating the pressure of the hydrogen;
a3: and (3) mixing the hydrogen after pressure regulation into the upstream and/or downstream of the natural gas.
3. The natural gas pressure energy utilizing method according to claim 1 or 2, wherein the step S4 further comprises the steps of:
monitoring the preheating heat required by the natural gas before power generation and the electrolysis heat in the high-temperature electrolyte;
if the preheating heat is smaller than the electrolysis heat, storing part of heat in the high-temperature electrolyte; and if the preheating heat is larger than the electrolysis heat, using the heat in the stored high-temperature electrolyte to preheat the natural gas before power generation.
4. A natural gas pressure energy utilizing method according to claim 3, wherein said preheating heat is obtained by monitoring a flow parameter and/or a temperature parameter of said natural gas before power generation.
5. The natural gas pressure energy utilizing method according to claim 4, wherein when the flow rate parameter is decreased and/or the temperature parameter is increased, a flow rate ratio of the high-temperature electrolyte for preheating the natural gas is decreased and a flow rate ratio of the high-temperature electrolyte for storing heat is increased; when the flow parameter increases and/or the temperature parameter decreases, the flow rate ratio of the high-temperature electrolyte for preheating the natural gas is increased and the flow rate ratio of the high-temperature electrolyte for storing heat is decreased.
6. A natural gas pressure energy utilization apparatus based on the natural gas pressure energy utilization method according to any one of claims 3 to 5, comprising:
the power generation device is used for converting pressure energy of the natural gas into electric energy;
the electrolysis device is connected with the power generation device and is used for electrolyzing electrolyte by utilizing the electric energy;
the heat exchange device comprises a heat absorption side and a heat release side, wherein the heat absorption side is used for absorbing waste heat generated by the electrolysis device, and the heat release side is used for preheating the natural gas upstream of the power generation device by using the waste heat.
7. The natural gas pressure energy utilizing device according to claim 6, wherein the electrolysis device comprises:
an electrolyzer for decomposing the electrolyte into hydrogen and oxygen;
the separation device is connected with the electrolytic tank and is used for separating high-temperature electrolyte in the hydrogen and the oxygen;
the circulating pipeline is sequentially connected with the separating device, the heat exchange device and the electrolytic tank, and is used for conveying the high-temperature electrolyte to the heat exchange device to preheat the natural gas and conveying the high-temperature electrolyte after heat exchange back to the electrolytic tank.
8. The natural gas pressure energy utilizing apparatus according to claim 7, comprising a heat storage device connected to the circulation line and connected in parallel with the heat exchange device, and the heat storage device is for storing heat of the high-temperature electrolyte from the separation device or for supplying the stored heat of the high-temperature electrolyte to the heat exchange device to preheat the natural gas.
9. The natural gas pressure energy utilizing device as defined in claim 6, wherein the power generating device is an expansion generator for converting the pressure energy of the natural gas into mechanical energy and then converting the mechanical energy into the electric energy.
10. The natural gas pressure energy utilizing device as defined in claim 7, characterized by comprising a purifying device connected to said separating device and for purifying said hydrogen gas.
CN202310086016.8A 2023-01-30 2023-01-30 Natural gas pressure energy utilization method and natural gas pressure energy utilization device Pending CN116288403A (en)

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