Integrated hybrid power generation system

Abstract

The invention discloses an integrated hybrid power generation system which comprises a hydrogen production unit, a gas compression and storage unit, a turbine subunit and a heat exchange subunit which are sequentially and circularly connected, and the hydrogen production unit is used for producing hydrogen and oxygen through wind and light waste electricity electrolysis water; the gas compression and storage unit is used for compressing and storing the prepared hydrogen, oxygen and air; the turbine subunit is used for converting high-temperature and high-pressure fuel gas energy into mechanical work; and the heat exchange subunit is used for realizing multi-stage utilization of energy. According to the system, fluctuating wind and light abandoned electricity and a gas turbine power generation system are integrated together through the compression energy storage system, so that power circulation is safe, stable and reliable, the energy gradient utilization efficiency is improved, heat recovery is optimized, and the efficiency is maximized. Hydrogen is prepared from water recycled through wind-solar abandoned electricity electrolysis power circulation, and is stored in a high-pressure gas state through multi-stage compression and interstage cooling. And the hydrogen energy storage scale is larger, and the storage time is longer.

Description

Technical Field

[0001] The present invention relates to the field of power generation systems, and in particular to an integrated hybrid power generation system. Background Art

[0002] With the increasing demand for energy and the depletion of traditional fossil energy, renewable energy such as wind and solar energy is an important alternative to fossil energy. Combined with the global energy situation, renewable energy such as wind and solar energy is the main energy source to replace traditional fossil fuels. Since the output of new energy such as wind and solar energy is naturally intermittent, random and volatile, it is difficult to peak after direct grid connection, which poses a great challenge to the safety and reliability of the power grid. The problem of wind and solar power abandonment has always existed in the power system. Existing technologies have problems such as low utilization rate of clean energy such as wind and solar energy and low energy system efficiency. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides an integrated hybrid power generation system, which solves the problems of low utilization rate of clean energy such as wind energy and solar energy and low energy system efficiency in the prior art.

[0004] According to a first aspect, an embodiment of the present invention provides an integrated hybrid power generation system, comprising: a hydrogen production unit, a gas compression storage unit, a turbine subunit, and a heat exchange subunit, wherein each unit is cyclically connected in sequence, wherein:

[0005] The hydrogen production unit is used to produce hydrogen and oxygen by electrolyzing water using abandoned wind and solar power;

[0006] The gas compression storage unit is used to compress and store the produced hydrogen, oxygen and air;

[0007] The turbine subunit is used to convert the high-temperature and high-pressure gas energy into mechanical work;

[0008] The heat exchange subunit is used to achieve multi-stage utilization of energy.

[0009] In combination with the first aspect, in a first embodiment of the first aspect, the hydrogen production unit includes: a water recovery device and a hydrogen production device,

[0010] The air inlet of the hydrogen production unit is connected to the water recovery device that provides water. The hydrogen production device decomposes the water at the air inlet into hydrogen and oxygen, and transports the gas to the gas compression storage unit through the air outlet of the hydrogen production unit.

[0011] In combination with the first embodiment of the first aspect, in the second embodiment of the first aspect, the gas compression storage unit includes:

[0012] A hydrogen compressor, used for compressing the hydrogen produced by the hydrogen production equipment;

[0013] A hydrogen intercooler, used for cooling the hydrogen compressed by the hydrogen compressor;

[0014] Hydrogen storage tank, used to store compressed hydrogen;

[0015] An oxygen compressor, used to compress the oxygen produced by the hydrogen production equipment;

[0016] An oxygen intercooler, used for cooling the oxygen compressed by the oxygen compressor;

[0017] Oxygen storage tank, used to store compressed oxygen;

[0018] Air compressor, used to compress air;

[0019] An air intercooler, used for cooling the air compressed by the air compressor;

[0020] Air storage tank, used to store compressed air.

[0021] In combination with the second embodiment of the first aspect, in the third embodiment of the first aspect, the hydrogen production equipment includes a hydrogen outlet and an oxygen outlet, the hydrogen outlet is connected to the hydrogen compressor, and the oxygen outlet is connected to the oxygen compressor.

[0022] In combination with the second embodiment of the first aspect, in a fourth embodiment of the first aspect, the turbine subunit includes:

[0023] A combustion chamber, used for burning the hydrogen from the hydrogen storage tank, the oxygen from the oxygen storage tank and the air from the air storage tank to generate heat energy;

[0024] A turbine is used to convert the thermal energy generated by the combustion chamber into mechanical energy.

[0025] In combination with the fourth embodiment of the first aspect, in the fifth embodiment of the first aspect, the turbine subunit further includes:

[0026] a regenerator for further preheating the air and oxygen leading to the combustion chamber and cooling the exhaust gas produced by the combustion chamber;

[0027] An economizer is used to preheat the air and oxygen leading to the combustion chamber and further cool the exhaust gas generated by the combustion chamber.

[0028] In combination with the fifth implementation of the first aspect, in the sixth implementation of the first aspect,

[0029] The water outlet of the economizer is connected to the water inlet of an external cold tank, and the water outlet of the cold tank is connected to the water inlets of the hydrogen intercooler, the oxygen intercooler, and the air intercooler;

[0030] The water inlet of the economizer is connected to the water outlet of the external hot tank, and the water inlet of the hot tank is connected to the water outlets of the hydrogen intercooler, the oxygen intercooler, and the air intercooler.

[0031] In combination with the second embodiment of the first aspect, in the seventh embodiment of the first aspect,

[0032] The hydrogen compressor, the oxygen compressor, the air compressor and the hydrogen production equipment are powered by wind and solar power.

[0033] The integrated hybrid power generation system provided by the embodiment of the present invention uses water recovered from the wind and solar power abandonment electrolysis power cycle to produce hydrogen, and stores it in the form of high-pressure gas through multi-stage compression and inter-stage cooling. It is expected to improve energy utilization and reduce the impact of energy production on the environment in the future; the hybrid power system combining the compression energy storage system with the gas turbine fully considers the heat recovery of the turbine exhaust, improves the energy cascade utilization efficiency, optimizes heat recovery and maximizes efficiency. In the compression energy storage system, a multi-stage compression and inter-stage cooling method is adopted to divide the compression process into multiple stages, and cooling is performed between each stage to reduce the temperature and power consumption in the process; the hybrid power system integrates fuel generation, energy storage and power generation into the solution, and achieves higher energy utilization and more stable energy output when using renewable energy such as wind energy and solar energy for power generation, which provides advantages for the utilization of renewable energy. The integration of wind and solar power abandonment and compression energy storage system provides a solution strategy to smooth the intermittent and volatile nature of renewable energy. This solution can promote the development and utilization of wind and solar energy by promoting the consumption, safety and reliability of renewable energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 is a schematic diagram of an integrated hybrid power generation system according to an embodiment of the present invention;

[0036] Figure 2 is another schematic diagram of an integrated hybrid power generation system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] With the rapid development of human society, the demand for energy is increasing, and traditional fossil energy is becoming increasingly exhausted. Renewable energy such as wind energy and solar energy are important choices to replace fossil energy. Since the output of new energy such as wind energy and solar energy is naturally intermittent, random and volatile, it is difficult to adjust the peak after direct grid connection, which poses a great challenge to the safety and reliability of the power grid. It is generally believed that the problem of wind and solar power curtailment has always existed in the power system. There is an urgent need to improve the utilization rate of clean energy such as wind energy and solar energy and to improve efficient energy systems.

[0039] An effective system to solve this problem is to use compressed energy storage technology, which can periodically store surplus and fluctuating energy, and then release energy in a stable and controllable manner as needed, so that the output of renewable energy such as wind energy and solar energy can be sustained and stable. Compression energy storage technology includes compressors, intercoolers, and storage tanks, etc. It achieves energy storage and utilization through multi-stage compression and interstage cooling processes, and has the characteristics of large energy storage capacity, long energy storage time, and high charging and discharging efficiency. Therefore, energy storage systems are very important for the efficient and stable utilization of renewable energy.

[0040] The compression energy storage system can store discontinuous, unstable, intermittent and fluctuating energy and release it when needed, smoothing the intermittency and volatility of renewable energy and promoting the consumption of renewable energy. The installed capacity of wind power, solar power and other renewable energy power generation has exceeded 300 million kilowatts. Due to the natural intermittent, random and volatile output of wind power, solar power and other renewable energy sources, a large amount of wind and solar power abandonment is generated. The wind and solar power abandonment can be stored through the compression energy storage system to improve energy utilization efficiency.

[0041] In the compressed energy storage system, a multi-stage compression and interstage cooling system is used to divide the compression process into multiple stages, and cooling is performed between each stage to reduce the temperature and power consumption during the process. In order to further improve the efficiency of the system, the compressed energy storage system and the gas turbine are integrated with a new thermal system. The gas in the storage tank burns in the combustion chamber and generates a high-temperature airflow, which is used for the turbine to do work. The heat exchange between the compressed energy storage system and the gas turbine cycle is achieved through the recuperator and economizer, which can significantly improve the efficiency of the integrated system.

[0042] As the most ideal green energy in the 21st century, hydrogen energy is clean, pollution-free and has a high calorific value per unit mass. Hydrogen is produced by recycling water from wind and solar power electrolysis and then stored in the form of high-pressure gas through multi-stage compression and inter-stage cooling. Hydrogen energy storage can be larger in scale and longer in duration.

[0043] By efficiently producing hydrogen to decompose water to produce hydrogen and oxygen, and using compressed energy storage technology to store the abandoned wind and solar power, the fluctuating abandoned wind and solar power can be "integrated" with the gas turbine power generation system through the compressed energy storage system, which is regarded as the core support for achieving energy structure adjustment and continuous and stable transmission.

[0044] The present invention decomposes water to produce hydrogen and oxygen through efficient hydrogen production, and uses compressed energy storage technology to store wind and solar power. The fluctuating wind and solar power is "integrated" with the gas turbine power generation system through the compressed energy storage system, making the power cycle safe, stable and reliable. The integrated power cycle effectively recovers low-grade heat energy from the regenerator and economizer, achieving the purpose of cascade utilization of heat energy and improving the system efficiency of the integrated cycle.

[0045] In this embodiment, an integrated hybrid power generation system is provided. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived. Figure 1 is a schematic diagram of an integrated hybrid power generation system according to an embodiment of the present invention. Figure 1 As shown, it includes: a hydrogen production unit 101, a gas compression storage unit 202, a turbine subunit 303, and a heat exchange subunit 404. The various units are connected in a cycle in sequence, wherein the hydrogen production unit 101 is used to utilize wind and solar power abandonment 1 to electrolyze water to produce hydrogen and oxygen; the gas compression storage unit 202 is used to compress the produced hydrogen, oxygen and air, and store them; the turbine subunit 303 is used to convert the high-temperature and high-pressure fuel gas energy into mechanical work; the heat exchange subunit 404 is used to achieve multi-stage utilization of energy.

[0046] In this embodiment, specifically Figure 2 Another schematic diagram of the integrated hybrid power generation system shown, specifically the hydrogen production unit 101, includes: a water recovery device 5 and a hydrogen production device 2, the air inlet of the hydrogen production unit 101 is connected to the water recovery device 5 that provides water, and the hydrogen production device 2 decomposes the water at the air inlet into hydrogen and oxygen and transports the gas to the gas compression storage unit 202 through the air outlet of the hydrogen production unit 101.

[0047] The gas compression storage unit 202 includes: a hydrogen compressor for compressing the hydrogen produced by the hydrogen production equipment 2; a hydrogen intercooler for cooling the hydrogen compressed by the hydrogen compressor; a hydrogen storage tank 6 for storing compressed hydrogen; an oxygen compressor for compressing the oxygen produced by the hydrogen equipment 2; an oxygen intercooler for cooling the oxygen compressed by the oxygen compressor; an oxygen storage tank 9 for storing compressed oxygen; an air compressor for compressing air; an air intercooler for cooling the air compressed by the air compressor; and an air storage tank 10 for storing compressed air.

[0048] In another specific embodiment, the gas compression storage unit 202 includes: a first-stage hydrogen compressor 12 for compressing hydrogen produced by hydrogen production in the first stage; a first-stage hydrogen intercooler 23 for cooling the hydrogen compressed in the first stage; a second-stage hydrogen compressor 13 for compressing and cooling hydrogen in the second stage; a second-stage hydrogen intercooler 22 for cooling the hydrogen compressed in the second stage; a third-stage hydrogen compressor 14 for compressing and cooling hydrogen in the third stage; a third-stage hydrogen intercooler 23 for cooling the hydrogen compressed in the third stage; a hydrogen storage tank 6 for storing compressed hydrogen; a first-stage oxygen compressor 15 for compressing oxygen produced by efficient hydrogen production in the first stage; a first-stage oxygen intercooler 24 for cooling the oxygen compressed in the first stage; a second-stage oxygen compressor 16 for the third stage; Secondary compression and cooling of oxygen; secondary oxygen intercooler 25, used for cooling the second-stage compressed oxygen; tertiary oxygen compressor 17, used for third-stage compressed and cooled oxygen; tertiary oxygen intercooler 26, used for cooling the third-stage compressed oxygen; oxygen storage tank 9, storing compressed oxygen; primary air compressor 18, used for first-stage compressed air; primary air intercooler 27, used for cooling the first-stage compressed air; secondary air compressor 19, used for second-stage compressed and cooled air; secondary air intercooler 28, used for cooling the second-stage compressed air; tertiary air compressor 20, used for third-stage compressed and cooled air; tertiary air intercooler 29, used for cooling the third-stage compressed air; air storage tank 10, storing compressed air.

[0049] Specifically, the first-stage hydrogen compressor 12, the second-stage hydrogen compressor 13, the third-stage hydrogen compressor 14, the first-stage oxygen compressor 15, the second-stage oxygen compressor 16, the third-stage oxygen compressor 17, the first-stage air compressor 18, the second-stage air compressor 19, the third-stage air compressor 20 and the hydrogen production equipment 2 are provided with energy by the wind and solar power curtailment 1.

[0050] The hydrogen production equipment 2 includes a hydrogen outlet and an oxygen outlet, the hydrogen outlet is connected to the hydrogen compressor, and the oxygen outlet is connected to the oxygen compressor. The turbine subunit 303 includes: a combustion chamber 3, which is used to burn hydrogen from the hydrogen storage tank 6, oxygen from the oxygen storage tank and air from the air storage tank 10 to generate heat energy; a turbine 30, which is used to convert the heat energy generated by the combustion chamber 3 into mechanical energy; a regenerator 11, which is used to further preheat the air and oxygen leading to the combustion chamber 3 and cool the tail gas generated by the combustion chamber 3; an economizer 4, which is used to preheat the air and oxygen leading to the combustion chamber 3 and further cool the tail gas generated by the combustion chamber 3. The water outlet of the economizer 4 is connected to the water inlet of the external cold tank 7, and the water outlet 01 of the cold tank 7 is connected to the water inlet of the hydrogen intercooler, the oxygen intercooler and the air intercooler; the water inlet of the economizer 4 is connected to the water outlet of the external hot tank 8, and the water inlet of the hot tank 8 is connected to the water outlet of the hydrogen intercooler, the oxygen intercooler and the air intercooler. In this embodiment, 01a, 01b, 01c, 01d, 01e, 01f, 01g, 01h, and 01i respectively represent different heat exchangers (21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29) whose inlets are connected to the cold tank 7, and 02a, 02b, 02c, 02d, 02e, 02f, 02g, 02h, and 02i respectively represent different heat exchangers (21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29) whose outlets are connected to the hot tank 8.

[0051] In this embodiment, the hydrogen production equipment 2 uses the water in the water recovery equipment 5 in the electrolysis power cycle of the wind and solar power abandonment 1 to produce hydrogen and oxygen, mainly involving the gas conversion: 2H2O→2H2+O2. Hydrogen, oxygen and air are stored in corresponding storage tanks through three-stage compression and interstage cooling. Multi-stage compression makes the compression ratio of each stage relatively low, reducing the temperature rise of each stage. By cooling between each stage, the temperature of the gas can be further reduced, reducing the total compression power consumption.

[0052] The oxygen and air leaving the storage tank are preheated in turn through the economizer 4 and the regenerator 11, and are mixed and burned with the hydrogen from the hydrogen storage tank 6 in the combustion chamber 3, which can actually be part of the gas turbine. The reaction occurring in the combustion chamber 3 is: 2H2+O2→2H2O. The high-temperature gas discharged from the combustion chamber 3 enters the turbine 30 to perform work, and the exhaust gas of the turbine 30 is supplied to the regenerator 11 and the economizer 4, where the high-temperature tail gas and the normal-temperature gas are countercurrently contacted to preheat the air and oxygen leading to the combustion chamber 3 and cool the tail gas generated by the combustion chamber 3. The tail gas is recovered through the water 5, part of which is discharged into the atmosphere and part of which is supplied to the efficient hydrogen production 2.

[0053] The intercoolers after each stage of compressors, the regenerators after the turbines and the economizers are essentially a series of heat exchangers. They utilize the waste heat of high-temperature and high-pressure gas based on the principle of "temperature matching and cascade utilization", optimize heat recovery through cold tank 7 and hot tank 8, realize heat exchange between the compression energy storage system and the gas turbine cycle, and effectively improve the efficiency of the entire system.

[0054] The integrated hybrid power generation system provided in this embodiment uses water recovered from the wind and solar power abandonment electrolysis power cycle to produce hydrogen, and stores it in the form of high-pressure gas through multi-stage compression and inter-stage cooling. It is expected to improve energy utilization and reduce the impact of energy production on the environment in the future; the hybrid power system combining the compression energy storage system with the gas turbine fully considers the heat recovery of the turbine exhaust, improves the energy ladder utilization efficiency, optimizes heat recovery and maximizes efficiency. In the compression energy storage system, a multi-stage compression and inter-stage cooling method is adopted to divide the compression process into multiple stages, and cooling is performed between each stage to reduce the temperature and power consumption in the process; the hybrid power system integrates fuel generation, energy storage and power generation into the solution, and achieves higher energy utilization and more stable energy output when using renewable energy such as wind energy and solar energy for power generation, which provides advantages for the utilization of renewable energy. The integration of wind and solar power abandonment and compression energy storage system provides a solution strategy to smooth the intermittent and volatile nature of renewable energy. This solution can promote the development and utilization of wind and solar energy by promoting the consumption, safety and reliability of renewable energy.

[0055] Specifically, the compressed energy storage system is used to "integrate" the fluctuating wind and solar power with the gas turbine power generation system, making the power cycle safe, stable and reliable. The hybrid system combining the compressed energy storage system with the gas turbine fully considers the heat recovery of the turbine exhaust, improves the efficiency of energy cascade utilization, optimizes heat recovery and maximizes efficiency. Hydrogen is produced by using water recovered from the wind and solar power electrolysis power cycle, and is stored in the form of high-pressure gas through multi-stage compression and interstage cooling. Hydrogen energy storage is larger in scale and longer in storage time.

[0056] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An integrated hybrid power generation system, characterized in that: include: The hydrogen production unit, gas compression storage unit, turbine subunit, and heat exchange subunit are connected in a cycle in sequence, wherein: The hydrogen production unit is used to produce hydrogen and oxygen by electrolyzing water using abandoned wind and solar power; The gas compression storage unit is used to compress and store the produced hydrogen, oxygen and air; The turbine subunit is used to convert the high-temperature and high-pressure gas energy into mechanical work; The heat exchange subunit is used to achieve multi-stage utilization of energy.

2. The system according to claim 1, characterized in that The hydrogen production unit comprises: water recovery equipment and hydrogen production equipment, The air inlet of the hydrogen production unit is connected to the water recovery device that provides water. The hydrogen production device decomposes the water at the air inlet into hydrogen and oxygen, and transports the gas to the gas compression storage unit through the air outlet of the hydrogen production unit.

3. The system according to claim 2, characterized in that The gas compression storage unit comprises: A hydrogen compressor, used for compressing the hydrogen produced by the hydrogen production equipment; A hydrogen intercooler, used for cooling the hydrogen compressed by the hydrogen compressor; Hydrogen storage tank, used to store compressed hydrogen; An oxygen compressor, used to compress the oxygen generated by the hydrogen production equipment; An oxygen intercooler, used for cooling the oxygen compressed by the oxygen compressor; Oxygen storage tank, used to store compressed oxygen; Air compressor, used to compress air; An air intercooler, used for cooling the air compressed by the air compressor; Air storage tank, used to store compressed air.

4. The system according to claim 3, characterized in that The hydrogen production equipment comprises a hydrogen outlet and an oxygen outlet, wherein the hydrogen outlet is connected to the hydrogen compressor, and the oxygen outlet is connected to the oxygen compressor.

5. The system according to claim 3, characterized in that The turbine subunit comprises: A combustion chamber, used for burning the hydrogen from the hydrogen storage tank, the oxygen from the oxygen storage tank and the air from the air storage tank to generate heat energy; A turbine is used to convert the thermal energy generated by the combustion chamber into mechanical energy.

6. The system according to claim 5, characterized in that The turbine subunit further comprises: a regenerator for further preheating the air and oxygen leading to the combustion chamber and cooling the exhaust gas produced by the combustion chamber; An economizer is used to preheat the air and oxygen leading to the combustion chamber and further cool the exhaust gas generated by the combustion chamber.

7. The system according to claim 6, characterized in that The water outlet of the economizer is connected to the water inlet of an external cold tank, and the water outlet of the cold tank is connected to the water inlets of the hydrogen intercooler, the oxygen intercooler, and the air intercooler; The water inlet of the economizer is connected to the water outlet of the external hot tank, and the water inlet of the hot tank is connected to the water outlets of the hydrogen intercooler, the oxygen intercooler, and the air intercooler.

8. The system according to claim 3, characterized in that The hydrogen compressor, the oxygen compressor, the air compressor and the hydrogen production equipment are powered by wind and solar power abandonment 1.

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