CN219246731U

CN219246731U - Energy storage power generation system

Info

Publication number: CN219246731U
Application number: CN202320216421.2U
Authority: CN
Inventors: 李亮; 沈雪松; 朱江
Original assignee: Shandong Guochuang Fuel Cell Technology Innovation Center Co ltd
Current assignee: Shandong Guochuang Fuel Cell Technology Innovation Center Co ltd
Priority date: 2023-02-15
Filing date: 2023-02-15
Publication date: 2023-06-23
Anticipated expiration: 2033-02-15

Abstract

The utility model relates to the technical field of power systems, and discloses an energy storage power generation system.A fuel cell has two working modes, namely a power generation mode and an electrolysis mode, wherein hydrogen generated by catalytic reforming reaction of combustible waste gas is generated in the power generation mode, oxygen and hydrogen in air are utilized to generate electrochemical reaction in the fuel cell to generate power, and residual hydrogen is recovered through a hydrogen storage device to realize recycling of the combustible waste gas; in the electrolysis mode, the high-temperature steam is subjected to electrolysis reaction in the fuel cell to generate hydrogen, and the hydrogen generated by the electrolysis reaction and the hydrogen generated by the catalytic reforming reaction are stored by the hydrogen storage device.

Description

Energy storage power generation system

Technical Field

The utility model relates to the technical field of power systems, in particular to an energy storage power generation system.

Background

The oilfield mining site is mostly in a barren and cool zone, the electric power depends on the electric network, once the electric network is powered off, the normal operation of equipment of the oilfield mining site can be directly affected, and if the existing generator is directly adopted, the operation cost of the oilfield mining site can be increased.

In addition, large amounts of wastewater are generated during oilfield exploitation and coal mining, and wastewater treatment can increase the running cost of oilfield mines.

Disclosure of Invention

The utility model aims to provide an energy storage power generation system which can not only utilize combustible waste gas generated in an oilfield mining site to prepare and store hydrogen; and the dependence of the electricity consumption of the oilfield mining site on the power grid can be reduced.

To achieve the purpose, the utility model adopts the following technical scheme:

the energy storage power generation system comprises a fuel cell, an exhaust gas storage device, a reforming heat exchanger, a first heat exchanger, a separation condenser, a hydrogen storage device and a water tank, wherein the fuel cell is electrically connected with a bidirectional inverter and is provided with a fuel inlet and a fuel outlet;

the waste gas storage device is used for combustible waste gas, the waste gas storage device is connected to the fuel inlet through a reforming low-temperature channel of the reforming heat exchanger, a reforming catalyst is arranged in the reforming low-temperature channel, and the reforming catalyst is configured to enable the combustible waste gas to undergo catalytic reforming reaction in the reforming low-temperature channel;

the fuel outlet is connected with the inlet of the separation condenser through a high-temperature channel of the first heat exchanger, a gas outlet of the separation condenser is connected with a hydrogen separation filter, and a first outlet of the hydrogen separation filter is connected with the hydrogen storage device;

the water tank is connected with the reforming low-temperature channel of the reforming heat exchanger through a water pump and the low-temperature channel of the first heat exchanger.

As an optional technical scheme of the energy storage power generation system, a water outlet of the separation condenser is connected with the water tank.

As an optional technical scheme of the energy storage power generation system, the energy storage power generation system further comprises a first mixer and a first control valve, wherein the first control valve is a flow regulating valve; the low-temperature channel outlet of the first heat exchanger is connected with the inlet of the first mixer, the waste gas storage device is connected with the inlet of the first mixer through the first control valve, and the outlet of the first mixer is connected with the inlet of the reforming low-temperature channel.

As an optional technical scheme of the energy storage power generation system, the energy storage power generation system further comprises a first fan, wherein the first fan is connected with the air inlet of the fuel cell through the low-temperature channel of the second heat exchanger, and the air outlet of the fuel cell is connected with the high-temperature channel of the second heat exchanger.

As an optional technical scheme of the energy storage power generation system, the energy storage power generation system further comprises a second fan and a second mixer, the rotating speed of the second fan is adjustable, the second fan is connected with an inlet of the second mixer, a low-temperature channel outlet of the second heat exchanger is connected with an inlet of the second mixer, and an outlet of the second mixer is connected with an air inlet of the fuel cell.

As an alternative technical scheme of the energy storage power generation system, the energy storage power generation system further comprises a combustor, wherein the second fan is respectively connected with an air inlet of the combustor and an inlet of the second mixer through a second control valve, an outlet of the first control valve is respectively connected with an inlet of the reforming low-temperature channel and a fuel inlet of the combustor through an exhaust gas control valve, and an exhaust gas outlet of the combustor is connected with an inlet of the reforming high-temperature channel of the reforming heat exchanger;

the second control valve and the exhaust gas control valve are flow regulating valves.

As an alternative solution of the energy storage power generation system, the outlet of the high-temperature channel of the second heat exchanger is connected with the air inlet of the burner.

As an optional technical scheme of the energy storage power generation system, the energy storage power generation system further comprises a third mixer and a third control valve, wherein the third control valve is a flow regulating valve; the second fan can be respectively connected with the inlet of the second control valve and the inlet of the third mixer through the third control valve, the tail gas outlet of the burner is connected with the inlet of the third mixer, and the outlet of the third mixer is connected with the inlet of the reforming high-temperature channel.

As an alternative technical scheme of the energy storage power generation system, the energy storage power generation system further comprises a third heat exchanger, wherein two ends of a low-temperature channel of the third heat exchanger are respectively connected with an outlet of the low-temperature channel of the second heat exchanger and an inlet of the second mixer;

and the inlet of the high-temperature channel of the third heat exchanger is connected with the tail gas outlet of the combustor.

As an alternative technical scheme of the energy storage power generation system, the energy storage power generation system further comprises a fourth mixer, a fourth heat exchanger, a waste heat recovery water tank and a high-temperature water storage tank;

the high-temperature channel outlet of the third heat exchanger is connected with the inlet of the fourth mixer, and the high-temperature channel outlet of the reforming heat exchanger is connected with the inlet of the fourth mixer;

the outlet of the fourth mixer is connected to the high-temperature through inlet of the fourth heat exchanger, the waste heat recovery water tank is connected to the high-temperature water storage tank through the low-temperature channel of the fourth heat exchanger, and a waste heat recovery water pump is arranged on a connecting pipeline between the waste heat recovery water tank and the high-temperature water storage tank.

As an alternative solution of the above energy storage power generation system, the energy storage power generation system further includes a fifth mixer, an outlet of the fifth mixer is connected to a fuel inlet of the burner, an inlet of the fifth mixer is connected to an outlet of the exhaust gas control valve, and another inlet of the fifth mixer is connected to a second outlet of the hydrogen separation filter.

As an optional technical scheme of the energy storage power generation system, the combustible waste gas comprises at least one of oilfield gas, coal field gas, coke oven gas and coal bed gas, and the water tank is used for storing wastewater of oilfield mines.

The utility model has the beneficial effects that: the energy storage power generation system provided by the utility model has two working modes, namely a power generation mode and an electrolysis mode, water in a water tank is pumped by a water pump no matter the power generation mode or the electrolysis mode, high-temperature gas discharged from a fuel electrode side is utilized to preheat the water pumped by the water pump to form high-temperature steam, the high-temperature steam is sent into a reforming heat exchanger and then is subjected to catalytic reforming reaction with combustible waste gas sent into the reforming heat exchanger, so that heat energy in the high-temperature gas discharged from the fuel electrode side is recycled, and the combustible waste gas is recycled through the catalytic reforming reaction.

In a power generation mode, hydrogen generated by catalytic reforming reaction of the combustible waste gas is generated by electrochemical reaction of oxygen and hydrogen in the air in a fuel cell, and residual hydrogen is recovered by a hydrogen storage device; in the electrolysis mode, the high-temperature steam is subjected to an electrolysis reaction in the fuel cell to generate hydrogen, and the hydrogen generated by the electrolysis reaction and the hydrogen generated by the catalytic reforming reaction are stored by the hydrogen storage device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

Fig. 1 is a schematic diagram of an energy storage power generation system according to an embodiment of the present utility model.

In the figure:

1. a fuel cell; 2. an exhaust gas storage device; 3. a first mixer; 4. a reforming heat exchanger; 5. a first heat exchanger; 6. a separation condenser; 7. a hydrogen storage device; 8. a water tank; 9. a hydrogen separation filter; 10. a water pump; 11. a first control valve; 12. a first fan; 13. a second heat exchanger; 14. a second fan; 15. a second mixer; 16. a second control valve; 17. a burner; 18. a third mixer; 19. a third control valve; 20. a third heat exchanger; 21. a fourth mixer; 22. a fourth heat exchanger; 23. a waste heat recovery water tank; 24. a high-temperature water storage tank; 25. a fifth mixer; 26. an exhaust gas control valve; 27. a compressor; 28. a DC-DC converter; 29. a bidirectional inverter; 30. a power grid; 31. waste heat recovery water pump; 32. an exhaust gas filter; 33. and a charge-discharge switch.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1, the embodiment provides an energy storage power generation system, which can be used in oilfield mines to utilize combustible waste gas in oilfield mines to prepare and store hydrogen and generate power.

The energy storage power generation system comprises a fuel cell 1, an exhaust gas storage device 2, a reforming heat exchanger 4, a first heat exchanger 5, a separation condenser 6, a hydrogen storage device 7 and a water tank 8, wherein the fuel cell 1 is connected with a bidirectional inverter 29, the bidirectional inverter 29 is used for switching the fuel cell 1 between a power generation mode and an electrolysis mode, and the fuel cell 1 is provided with a fuel inlet and a fuel outlet; the exhaust gas storage device 2 is used for storing the combustible exhaust gas, the exhaust gas storage device 2 is connected to the fuel inlet through a reforming low-temperature channel of the reforming heat exchanger 4, a reforming catalyst is arranged in the reforming low-temperature channel, and the reforming catalyst is configured to enable the combustible exhaust gas to undergo catalytic reforming reaction in the reforming low-temperature channel; the fuel outlet is connected with the inlet of the separation condenser 6 through a high-temperature channel of the first heat exchanger 5, the gas outlet of the separation condenser 6 is connected with a hydrogen separation filter 9, and the first outlet of the hydrogen separation filter 9 is connected with a hydrogen storage device 7; the water tank 8 is connected to the reforming low-temperature passage of the reforming heat exchanger 4 through a water pump 10 and the low-temperature passage of the first heat exchanger 5.

When the energy storage power generation system is used in an oilfield mine, the combustible waste gas stored in the waste gas storage device 2 mainly comprises at least one of oilfield gas, coal field gas, coke oven gas and coal bed gas, the water stored in the water tank 8 is wastewater of the oilfield mine after purification treatment, namely deionized water after filtering and removing impurities, organic matters, metal ions and the like, and how to purify the wastewater of the oilfield mine is a prior art in the field and is not described in detail herein.

The fuel cell 1 has a fuel pole side into which air enters and an air pole side into which fuel enters. The fuel cell 1 has two operation modes, i.e., a power generation mode and an electrolysis mode, respectively, and the bi-directional inverter 29 can cause the fuel cell 1 to output electric power when the fuel cell 1 is in the power generation mode. Specifically, a large amount of the combustible exhaust gas in the exhaust gas storage device 2 enters the reforming heat exchanger 4; the water pump 10 sends a small amount of waste water in the water tank 8 into the first heat exchanger 5, the waste water in the first heat exchanger 5 is preheated by the high-temperature gas discharged from the fuel electrode side to form high-temperature water vapor, the high-temperature water vapor enters a reforming low-temperature channel of the reforming heat exchanger 4, the high-temperature water vapor and fuel are heated in the reforming low-temperature channel and undergo catalytic reforming reaction under the action of a reforming catalyst in the reforming low-temperature channel to form carbon monoxide, hydrogen and carbon dioxide, and the carbon monoxide, hydrogen and carbon dioxide enter the fuel electrode side along with the high-temperature water vapor, and then the carbon monoxide, the hydrogen and the carbon dioxide and the air enter the air electrode side of the fuel cell 1 are electrochemically generated to form water to generate electric energy, and the electric energy is output through the bidirectional inverter 29.

Optionally, the inner wall of the reforming low-temperature channel is coated with a reforming catalyst to form a reforming catalyst coating, and the reforming catalyst can make the high-temperature steam and alkane gas and carbon monoxide gas in the combustible waste gas perform catalytic reforming reaction to prepare hydrogen.

In the electrolysis mode, the water pump 10 sends a large amount of wastewater into the first heat exchanger 5, the wastewater in the first heat exchanger 5 is preheated by using high-temperature gas discharged from the fuel electrode side to form high-temperature steam, and the high-temperature steam enters a reforming low-temperature channel of the reforming heat exchanger 4; at the same time, a small amount of combustible waste gas in the waste gas storage device 2 enters the reforming heat exchanger 4; heating the high-temperature steam and the combustible waste gas in the reforming low-temperature channel, carrying out catalytic reforming reaction under the action of a reforming catalyst in the reforming low-temperature channel to form carbon monoxide, hydrogen and carbon dioxide, and entering the fuel electrode side along with the residual high-temperature steam; the power grid 30 or the storage battery supplies power to the fuel cell 1 through the bidirectional inverter 29, so that high-temperature vapor entering the fuel cell 1 is subjected to electrolytic reaction to generate hydrogen and oxygen, high-temperature gas discharged from the fuel electrode side is subjected to heat exchange by the first heat exchanger 5 and then cooled, and then is subjected to gas-water separation by the separation condenser 6, and the separated gas is subjected to separation of hydrogen and other gases by the hydrogen separation filter 9 so as to conveniently send the separated hydrogen to the hydrogen storage device 7 for storage, and recycling of wastewater of an oilfield mine is realized.

The oxygen-enriched air is formed by the mixed gas of the oxygen generated by electrolysis and the residual air, and is sent to the burner 17 for residual combustion, so that the oxygen-enriched combustion is facilitated, the full combustion is realized, and the combustion effect is improved.

According to the energy storage power generation system provided by the embodiment, the fuel cell 1 has two working modes, namely a power generation mode and an electrolysis mode, the high-temperature gas discharged from the fuel electrode side is utilized to preheat the low-temperature wastewater of the oilfield mining site to form high-temperature steam no matter the power generation mode or the electrolysis mode, the high-temperature steam is sent to the reforming heat exchanger 4 to be subjected to internal reference catalytic reforming reaction, the heat energy in the high-temperature gas discharged from the fuel electrode side is recycled, and the waste water and the combustible waste gas of the oilfield mining site are recycled through the catalytic reforming reaction.

In a power generation mode, hydrogen generated by catalytic reforming reaction of combustible waste gas of an oilfield mining site is generated by electrochemical reaction of oxygen and hydrogen in air in the fuel cell 1 so as to meet the power consumption requirement of the oilfield mining site, and residual hydrogen is recovered through the hydrogen storage device 7; in the electrolysis mode, the high-temperature steam is subjected to an electrolysis reaction in the fuel cell 1 to generate hydrogen, the wastewater in the oilfield mining site is recycled through the electrolysis reaction, and the hydrogen generated by the electrolysis reaction and the hydrogen generated by the catalytic reforming reaction are recycled through the hydrogen storage device 7.

Optionally, the energy storage power generation system further includes a charge-discharge switch 33, a DC-DC converter 28, and a bidirectional inverter 29, wherein the charge-discharge switch 33 is used for controlling the start-stop of the fuel cell 1, the DC-DC converter 28 is used for voltage conversion, and the bidirectional inverter 29 is used for converting the ac power of the power grid 30 into DC power and converting the DC power into ac power.

Specifically, when the fuel cell 1 is in the power generation mode, the fuel cell 1 operates to generate electric energy and outputs the electric energy to the DC-DC converter 28 through the charge-discharge switch 33 for voltage conversion, and then converts the electric energy into alternating current through the bidirectional inverter 29, the alternating current is mainly supplied to oilfield mines for use, and the surplus electric energy can be sold to the power grid 30 or stored through a storage battery.

When the fuel cell 1 is in the electrolysis mode, electric energy is supplied to the bi-directional inverter 29 through the electric network 30 or the storage battery, the bi-directional inverter 29 converts alternating current into direct current, the DC-DC converter 28 converts voltage, and then the charge-discharge switch 33 supplies power to the fuel cell 1, so that the fuel cell 1 can perform electrolysis reaction.

Optionally, in order to improve the catalytic reforming reaction efficiency, the energy storage power generation system further includes a first mixer 3, the exhaust gas storage device 2 is connected to an inlet of the first mixer 3, a low temperature channel outlet of the first heat exchanger 5 is connected to an inlet of the first mixer 3, and an outlet of the first mixer 3 is connected to a reforming low temperature channel inlet of the reforming heat exchanger 4.

The exhaust gas provided by the exhaust gas storage device 2 and the high-temperature steam discharged by the low-temperature channel of the first heat exchanger 5 are mixed by the first mixer 3, so that the mixing uniformity of the exhaust gas and the high-temperature steam is improved, and the mixed gas enters the reforming heat exchanger 4 to exchange heat and raise temperature and perform catalytic reforming reaction under the action of a reforming catalyst.

The catalytic reforming reaction occurs in the reforming heat exchanger 4 in both the electrolysis mode and the power generation mode. In the electrolysis mode, the combustible waste gas introduced into the first mixer 3 is 5% of the water vapor introduced into the first mixer 3, the water amount provided by the water pump 10 is adjustable, for example, the water pump 10 is a variable pump, or the rotating speed of the water pump 10 is adjustable, the water amount provided by the water pump 10 is calculated according to the electrolysis demand gas yield and the water electrolysis rate, and the combustible waste gas and the water vapor are mixed by the first mixer 3 and enter the reforming catalyst to generate a catalytic reforming reaction to generate a reducing gas, so that the reducing environment of the fuel electrode side of the fuel cell 1 is ensured. In the power generation mode, the amount of the combustible exhaust gas introduced into the first mixer 3 is calculated according to the power demand, the current demand, and the fuel utilization rate of the power generation, and the amount of water supplied by the water pump 10 is calculated according to the water-carbon ratio requirement.

Optionally, the water outlet of the separation condenser 6 is connected to the water tank 8, the gas containing water vapor discharged from the first heat exchanger 5 is separated by the separation condenser 6, and the separated water is sent to the water tank 8 for recycling.

Optionally, the energy storage power generation system further comprises a first control valve 11, the first control valve 11 being connected between the exhaust gas storage device 2 and the inlet of the first mixer 3. When the entire energy storage power generation system is not operating, the first control valve 11 is closed. In order to achieve an adjustable flow of exhaust gas provided by the exhaust gas storage means 2, the first control valve 11 is optionally a flow regulating valve.

Optionally, an exhaust gas filter 32 is disposed on a connection line between the outlet of the first control valve 11 and the inlet of the first mixer 3, so as to filter the exhaust gas provided by the exhaust gas storage device 2, and mainly filter and remove solid particulate impurities, toxic gases, sulfides and the like in the oil field exhaust gas, coal seam exhaust gas and other exhaust gases in the combustible exhaust gas.

Optionally, the energy storage power generation system further comprises a first fan 12, the first fan 12 is connected to the air inlet of the fuel cell 1 through the low-temperature channel of the second heat exchanger 13, and the air outlet of the fuel cell 1 is connected to the high-temperature channel inlet of the second heat exchanger 13.

Fresh air is provided for an air inlet of the air pole side through the first fan 12, and high-temperature gas exhausted from an air outlet of the air pole side is heated up through the second heat exchanger 13 to the fresh air provided by the first fan 12, so that heat energy contained in the high-temperature gas exhausted from the air pole side is recycled.

Optionally, the energy storage power generation system further includes a second fan 14 and a second mixer 15, the second fan 14 is connected to an inlet of the second mixer 15, an outlet of the low-temperature channel of the second heat exchanger 13 is connected to an inlet of the second mixer 15, and an outlet of the second mixer 15 is connected to an air inlet of the fuel cell 1.

When the temperature of the air inlet at the air pole side is higher, low-temperature air is provided by the second fan 14, the low-temperature air provided by the second fan 14 and the fresh air heated by the second heat exchanger 13 are sent into the second mixer 15 to be mixed, and the mixed air is sent to the air inlet at the air pole side.

Optionally, the rotation speed of the second fan 14 is adjustable, so that the amount of the cool air provided by the second fan 14 is adjustable.

Optionally, the energy storage power generation system further comprises a combustor 17, the second fan 14 is respectively connected with an air inlet of the combustor 17 and an inlet of the second mixer 15 through a second control valve 16, an outlet of the first control valve 11 is respectively connected with an inlet of the reforming low-temperature channel and a fuel inlet of the combustor 17 through an exhaust gas control valve 26, and an exhaust gas outlet of the combustor 17 is connected with an inlet of the reforming high-temperature channel of the reforming heat exchanger 4.

The waste gas is provided for the burner 17 through the waste gas storage device 2, low-temperature air is provided for the burner 17 through the second fan 14, and high-temperature tail gas generated by the burner 17 is introduced into the reforming high-temperature channel so as to heat the gas in the reforming low-temperature channel, and meanwhile, a high-temperature environment is provided for the reforming low-temperature channel, so that the catalytic reforming reaction is facilitated.

Optionally, the outlet of the high-temperature channel of the second heat exchanger 13 is connected with the air inlet of the burner 17, and the air discharged from the air electrode side is cooled by the second heat exchanger 13 and then sent into the burner 17 for internal combustion, so that the waste gas is reused.

Optionally, the second control valve 16 is a flow regulating valve, and the air provided by the second fan 14 is distributed through the second control valve 16, and a part of the air is sent to the fuel cell 1 to regulate and control the temperature of the air inlet on the air pole side, so that the air temperature of the air inlet on the air pole side meets the requirement; the other part is introduced into the burner 17 to avoid the phenomenon of air shortage of the burner 17 and ensure the combustion of the combustible waste gas entering the burner 17 to be sufficient.

Optionally, the exhaust gas control valve 26 is a flow control valve, and the exhaust gas provided by the exhaust gas storage device 2 is distributed through the exhaust gas control valve 26, and part of the exhaust gas is sent to the burner 17 to participate in combustion, so that the phenomenon of air deficiency of the burner 17 is avoided, and the combustion of the combustible exhaust gas entering the burner 17 is ensured to be sufficient; and the other part is sent into a reforming low-temperature channel for catalytic reforming reaction.

Optionally, the energy storage power generation system further includes a third mixer 18 and a third control valve 19, where the second fan 14 can be connected to the inlet of the second control valve 16 and the inlet of the third mixer 18 through the third control valve 19, respectively, and the tail gas outlet of the combustor 17 is connected to the inlet of the third mixer 18, and the outlet of the third mixer 18 is connected to the inlet of the reforming high-temperature channel.

The low-temperature air is provided for the third mixer 18 through the second fan 14, and the high-temperature tail gas provided by the burner 17 enters the third mixer 18 to be mixed with the low-temperature air provided by the second fan 14 so as to provide high-temperature gas with proper temperature for the high-temperature channel of the reforming heat exchanger 4.

Optionally, the third control valve 19 is a flow regulating valve to allow the second fan 14 to provide an appropriate amount of cryogenic air.

Optionally, the energy storage power generation system further comprises a third heat exchanger 20, and two ends of a low-temperature channel of the third heat exchanger 20 are respectively connected with an outlet of the low-temperature channel of the second heat exchanger 13 and an inlet of the second mixer 15; the high temperature channel inlet of the third heat exchanger 20 is connected to the tail gas outlet of the burner 17. Illustratively, the high temperature passage inlet of the third heat exchanger 20 is connected between the tail gas outlet of the combustor 17 and the inlet of the third mixer 18.

The high-temperature tail gas formed by the operation of the burner 17 is discharged from an air outlet at the air pole side through the third heat exchanger 20, the temperature of the gas subjected to heat exchange and temperature reduction through the second heat exchanger 13 is increased, and the heated gas enters an air inlet at the air pole side through the second mixer 15, so that the high-temperature tail gas formed by the operation of the burner 17 is recycled.

The air in the burner 17 is generally excessive, so that the combustible gas in the burner 17 is fully combusted, and the high-temperature tail gas discharged from the burner 17 is divided into two paths, wherein one path is used for heating the air entering the air electrode side, and the other path is used for heating the gas at the fuel electrode side.

Optionally, the energy storage power generation system further comprises a fourth mixer 21, a fourth heat exchanger 22, a waste heat recovery water tank 23 and a high temperature water storage tank 24; the outlet of the high-temperature channel of the third heat exchanger 20 is connected to the inlet of the fourth mixer 21, and the outlet of the reforming high-temperature channel of the reforming heat exchanger 4 is connected to the inlet of the fourth mixer 21; the outlet of the fourth mixer 21 is connected to the inlet of the high-temperature channel of the fourth heat exchanger 22, the waste heat recovery water tank 23 is connected to the high-temperature water storage tank 24 through the low-temperature channel of the fourth heat exchanger 22, and a waste heat recovery water pump 31 is arranged on a connecting pipeline between the waste heat recovery water tank 23 and the high-temperature water storage tank 24.

The fourth mixer 21 is utilized to mix the high-temperature gas cooled by the third heat exchanger 20 and the high-temperature gas cooled by the reforming heat exchanger 4, the mixed gas enters the high-temperature channel of the fourth heat exchanger 22, low-temperature water in the waste heat recovery water tank 23 enters the low-temperature channel of the fourth heat exchanger 22 under the action of the waste heat recovery water pump 31, the warmed water is sent into the high-temperature water storage tank 24 so as to meet the heat supply requirement of the life of a mine, the cooled low-temperature gas is discharged, the waste heat recovery and the utilization of the whole energy storage power generation system are realized, a heating power station can be canceled, the operation cost of the energy storage power generation system is reduced, and meanwhile, the discharged low-temperature gas does not contain harmful gas.

Optionally, the energy storage power generation system further comprises a fifth mixer 25, an outlet of the fifth mixer 25 is connected to the fuel inlet of the burner 17, one inlet of the fifth mixer 25 is connected to one outlet of the exhaust gas control valve 26, and the other inlet of the fifth mixer 25 is connected to the second outlet of the hydrogen separation filter 9.

The gas separated by the hydrogen separation filter 9 is stored in the hydrogen storage device 7, other separated gases such as carbon monoxide, carbon dioxide, a small amount of alkane gas which does not undergo catalytic reforming reaction and the like are sent into the fifth mixer 25, meanwhile, part of combustible waste gas stored by the waste gas storage device 2 is sent into the fifth mixer 25, mixed by the fifth mixer 25 and sent to the burner 17 for burning, and waste gas recycling is realized.

In order to ensure sufficient combustion, the total flow of the combustible gas fed into the burner 17 is detected by the first flow meter, and the flow of the combustible gas fed into the burner 17 is adjusted in cooperation with the exhaust gas control valve 26, while the flow of the air fed into the burner 17 is detected by the second flow meter, and the flow of the air fed into the burner 17 is adjusted in cooperation with the second control valve 16, so that the air-fuel ratio of the burner 17 is adjusted.

Optionally, a compressor 27 is disposed on the connection line between the first outlet of the hydrogen separation filter 9 and the hydrogen storage device 7, and is used for compressing the hydrogen separated by the hydrogen separation filter 9, and storing the compressed hydrogen by the hydrogen storage device 7.

Hydrogen can be generated in both the power generation mode and the electrolysis mode, the hydrogen in the electrolysis mode is derived from electrolysis of water, and the hydrogen in the power generation mode is derived from residual hydrogen after the combustible waste gas is subjected to catalytic reforming reaction and then is utilized by the fuel cell 1.

The second fan 14 and the second control valve 16 cooperate to send cool air to the second mixer 15 to effect air temperature regulation into the air pole side. When the air temperature at the air pole side is too high, it means that the temperature of the high-temperature tail gas entering the combustor 17 in the third heat exchanger 20 is too high, and the amount of cold air entering the second mixer 15 is increased; when the temperature of the air on the air pole side is too low, it means that the temperature of the high-temperature exhaust gas entering the burner 17 in the third heat exchanger 20 is too low, the amount of the cold air entering the second mixer 15 is reduced, and if the amount of the cold air entering the second mixer 15 is zero, the power of the burner 17 is increased to increase the temperature of the high-temperature exhaust gas of the burner 17, if the temperature of the air on the air pole side does not meet the requirement.

The second fan 14 and the third control valve 19 cooperate to regulate the amount of cold air entering the third mixer 18, so that the outlet temperature of the reforming heat exchanger 4 is a predetermined temperature on the fuel electrode side of the fuel cell 1. When the outlet temperature of the reforming heat exchanger 4 is too high, the amount of cold air entering the third mixer 18 is increased to reduce the heat exchange temperature difference, thereby reducing the outlet temperature of the reforming heat exchanger 4 after heat exchange; when the outlet temperature of the reforming heat exchanger 4 is too low, the amount of the cold air entering the third mixer 18 is reduced, and when the amount of the cold air entering the third mixer 18 is zero, the outlet temperature of the reforming heat exchanger 4 still does not meet the requirement, which means that the power of the burner 17 is insufficient and the power of the burner 17 needs to be increased.

The specific working process of the energy storage power generation system is as follows:

in the power generation mode, the air flow path on the air electrode side of the fuel cell 1: the first fan 12 heats the normal-temperature air through the second heat exchanger 13, then heats the air through the third heat exchanger 20, and then mixes the air with the low-temperature air provided by the second fan 14 in the second mixer 15 to form high-temperature air, and then enters the air pole side; the high-temperature air discharged from the air pole side is cooled by the second heat exchanger 13 and then enters the combustor 17 for combustion.

In the power generation mode, the gas flow path on the fuel electrode side of the fuel cell 1: the combustible waste gas in the waste gas storage device 2 enters the first mixer 3 and is mixed with high-temperature steam entering the first mixer 3 to form mixed gas, the mixed gas is subjected to heat exchange and temperature rise in the reforming heat exchanger 4 and is subjected to catalytic reforming reaction to generate multicomponent gas consisting of hydrogen, carbon monoxide, carbon dioxide and the like, and the multicomponent gas enters the fuel electrode side; the high-temperature air discharged from the fuel electrode side enters a separation condenser 6 after being subjected to heat exchange and temperature reduction by a first heat exchanger 5, water separated by the separation condenser 6 enters a water tank 8, and is sent to the first heat exchanger 5 by a water pump 10 to be subjected to heat exchange and temperature rise to form high-temperature water vapor, and the high-temperature water vapor enters a first mixer 3; meanwhile, the gas separated by the separation condenser 6 enters the hydrogen separation filter 9 to separate hydrogen and other gases, the hydrogen separated by the hydrogen separation filter 9 is compressed by the compressor 27 and then enters the hydrogen storage device 7 to be stored for standby, and the other gases separated by the hydrogen separation filter 9 enter the fifth mixer 25.

Meanwhile, part of the waste gas stored in the waste gas storage device 2 enters the fifth mixer 25 through the waste gas control valve 26, various gases enter the fifth mixer 25 to be mixed and then enter the combustor 17, and part of high-temperature tail gas generated by the combustion of the combustor 17 enters the fourth mixer 21 after being cooled by the third heat exchanger 20; the other part of the high-temperature tail gas enters the third mixer 18, is mixed with cold air sent into the third mixer 18 by the second fan 14, enters the reforming heat exchanger 4, is cooled by the reforming heat exchanger 4, enters the fourth mixer 21, and mixed gas formed by mixing gas in the fourth mixer 21 enters the fourth heat exchanger 22 to be cooled and then is discharged. Meanwhile, the warm water in the waste heat recovery water tank 23 enters the fourth heat exchanger 22 to be heated under the action of the waste heat recovery water pump 31, and then enters the high-temperature water storage tank 24 for heat supply of an oilfield mining site.

In the power generation mode, electric energy generated by the electrochemical reaction in the fuel cell 1 is output through the charge/discharge switch 33, the DC-DC converter 28, and the bidirectional inverter 29.

In the electrolysis mode, the gas flow paths of the air electrode side and the fuel electrode side are basically the same, and the main difference is that the ratio of the high-temperature steam and the combustible waste gas entering the first mixer 3 is greatly different; at the same time, the electric energy of the electric network 30 or the electric energy stored in the storage battery passes through the bi-directional inverter 29, the DC-DC converter 28 and the charge-discharge switch 33 to the fuel cell 1, and the electrolysis reaction occurs in the fuel cell 1 to generate hydrogen and oxygen.

Furthermore, the foregoing description of the preferred embodiments and the principles of the utility model is provided herein. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims

1. The energy storage power generation system is characterized by comprising a fuel cell (1), an exhaust gas storage device (2), a reforming heat exchanger (4), a first heat exchanger (5), a separation condenser (6), a hydrogen storage device (7) and a water tank (8), wherein the fuel cell (1) is electrically connected with a bidirectional inverter (29), and the fuel cell (1) is provided with a fuel inlet and a fuel outlet;

the exhaust gas storage device (2) is used for storing combustible exhaust gas, the exhaust gas storage device (2) is connected to the fuel inlet through a reforming low-temperature channel of the reforming heat exchanger (4), a reforming catalyst is arranged in the reforming low-temperature channel, and the reforming catalyst is configured to enable the combustible exhaust gas to undergo catalytic reforming reaction in the reforming low-temperature channel;

the fuel outlet is connected with the inlet of the separation condenser (6) through a high-temperature channel of the first heat exchanger (5), a gas outlet of the separation condenser (6) is connected with a hydrogen separation filter (9), and a first outlet of the hydrogen separation filter (9) is connected with the hydrogen storage device (7);

the water tank (8) is connected with the reforming low-temperature channel of the reforming heat exchanger (4) through a water pump (10) and the low-temperature channel of the first heat exchanger (5).

2. Energy storage and generation system according to claim 1, characterized in that the water outlet of the separation condenser (6) is connected to the water tank (8).

3. The energy storage power generation system according to claim 1, further comprising a first mixer (3) and a first control valve (11), the first control valve (11) being a flow regulating valve; the low-temperature channel outlet of the first heat exchanger (5) is connected to the inlet of the first mixer (3), the waste gas storage device (2) is connected to the inlet of the first mixer (3) through the first control valve (11), and the outlet of the first mixer (3) is connected to the inlet of the reforming low-temperature channel.

4. A power generation system according to claim 3, further comprising a first fan (12), the first fan (12) being connected to the air inlet of the fuel cell (1) by a low temperature channel of a second heat exchanger (13), the air outlet of the fuel cell (1) being connected to the high temperature channel of the second heat exchanger (13).

5. The energy-storage power generation system according to claim 4, further comprising a second fan (14) and a second mixer (15), wherein the rotation speed of the second fan (14) is adjustable, the second fan (14) is connected to the inlet of the second mixer (15), the low-temperature channel outlet of the second heat exchanger (13) is connected to the inlet of the second mixer (15), and the outlet of the second mixer (15) is connected to the air inlet of the fuel cell (1).

6. The energy storage power generation system according to claim 5, further comprising a burner (17), wherein the second fan (14) is connected to an air inlet of the burner (17) and an inlet of the second mixer (15) respectively by a second control valve (16), wherein an outlet of the first control valve (11) is connected to an inlet of the reforming low temperature channel and a fuel inlet of the burner (17) respectively by an exhaust gas control valve (26), and wherein an exhaust gas outlet of the burner (17) is connected to an inlet of the reforming high temperature channel of the reforming heat exchanger (4);

the second control valve (16) and the exhaust gas control valve (26) are flow regulating valves.

7. Energy storage power generation system according to claim 6, characterized in that the high temperature channel outlet of the second heat exchanger (13) is connected to the air inlet of the burner (17).

8. The energy storage and generation system according to claim 7, further comprising a third mixer (18) and a third control valve (19), the third control valve (19) being a flow regulating valve; the second fan (14) can be respectively connected with the inlet of the second control valve (16) and the inlet of the third mixer (18) through the third control valve (19), the tail gas outlet of the burner (17) is connected with the inlet of the third mixer (18), and the outlet of the third mixer (18) is connected with the inlet of the reforming high-temperature channel.

9. The energy storage and power generation system according to claim 8, further comprising a third heat exchanger (20), wherein two ends of a low-temperature channel of the third heat exchanger (20) are respectively connected to a low-temperature channel outlet of the second heat exchanger (13) and an inlet of the second mixer (15);

the inlet of the high-temperature channel of the third heat exchanger (20) is connected with the tail gas outlet of the combustor (17).

10. The energy storage and power generation system according to claim 9, further comprising a fourth mixer (21), a fourth heat exchanger (22), a waste heat recovery water tank (23) and a high temperature water storage tank (24);

the high-temperature channel outlet of the third heat exchanger (20) is connected with the inlet of the fourth mixer (21), and the reforming high-temperature channel outlet of the reforming heat exchanger (4) is connected with the inlet of the fourth mixer (21);

the outlet of the fourth mixer (21) is connected to the inlet of the high-temperature channel of the fourth heat exchanger (22), the waste heat recovery water tank (23) is connected to the high-temperature water storage tank (24) through the low-temperature channel of the fourth heat exchanger (22), and a waste heat recovery water pump (31) is arranged on a connecting pipeline between the waste heat recovery water tank (23) and the high-temperature water storage tank (24).

11. The energy storage power generation system according to claim 7, further comprising a fifth mixer (25), an outlet of the fifth mixer (25) being connected to a fuel inlet of the burner (17), one inlet of the fifth mixer (25) being connected to one outlet of the off-gas control valve (26), the other inlet of the fifth mixer (25) being connected to a second outlet of the hydrogen separation filter (9).

12. The energy storage and power generation system according to any one of claims 1 to 11, wherein the combustible waste gas comprises at least one of oilfield gas, coal field gas, coke oven gas and coal bed gas, and the water tank (8) is used for storing waste water of oilfield mines.