CN115377453A - Device system and method for jointly storing energy by compressed air and hydrogen-oxygen fuel cell - Google Patents

Abstract

The invention provides a device system and a method for jointly storing energy by compressed air and a hydrogen-oxygen fuel cell, wherein the device system comprises a compressed air energy storage device, the hydrogen-oxygen fuel cell and a methanol catalytic reforming reaction device, and the high-temperature compressed air generated by the compressed air energy storage device is used for heating the raw material methanol and water of the hydrogen-oxygen fuel cell, so that the working temperature of a heat storage device is effectively reduced, and the safety of the heat storage device is improved; the methanol catalytic reforming reaction device is utilized to generate hydrogen required by the hydrogen-oxygen fuel cell, so that the power generation cost is saved; when the device system releases energy, the hydrogen-oxygen fuel cell and the air turbine generate electricity together, so that the electricity-electricity conversion efficiency of the whole device system is effectively improved; polyethylene glycol is used as a heat storage medium, so that the equipment cost is reduced, and the energy storage cost is saved; and the carbon dioxide generated by the methanol catalytic reforming reaction can be collected for comprehensive utilization, and the method has a large-scale popularization and application prospect.

Description

Device system and method for combined energy storage of compressed air and hydrogen-oxygen fuel cell

technical field

The invention relates to the technical field of electric power storage, in particular to a device system and method for combined energy storage of compressed air and hydrogen-oxygen fuel cells.

Background technique

Vigorously developing new energy sources mainly wind power and solar power is one of the keys to my country's economic and social green transformation and the implementation of the "carbon reduction commitment" at this stage, and it has become a social consensus. However, new energy is greatly affected by factors such as season, climate, day and night, and its power generation is volatile, intermittent and unpredictable. The impact of large-scale new energy access runs through all links of the power system from production, transmission to consumption, and brings challenges to the safe and stable operation of the power system, especially in the difficulties of prediction, control and scheduling. The balance between installed capacity and power generation of a high proportion of new energy access requires the use of energy storage technology to realize the coordinated operation of source, network, load and storage. Compressed air energy storage has been obtained due to its large capacity, long life and high safety. received extensive attention.

Compressed air energy storage refers to the energy storage method that uses electric energy to compress air during the low load period of the grid, seals the air at high pressure in the gas storage device, and releases the compressed air to drive the turbine to generate electricity during the peak load period of the grid. Compressed air energy storage can usually be divided into post-combustion compressed air energy storage systems and regenerative compressed air energy storage systems. Among them, regenerative compressed air energy storage systems are more efficient and do not consume external energy, which has become the direction of development.

CN113982892A discloses a high temperature regenerative compressed air energy storage system. Including: multi-stage compressors C1~Cn, multi-stage expanders T1~Tn and air storage chamber AS; the system also includes: high-temperature heat storage device TS and first regenerator RG1, the air from the outlets of compressors at each stage enters the high-temperature The thermal storage device TS is used to store high-temperature heat; the first regenerator RG1 is connected to the inlet of the x-th stage compressor Cx, the outlet of the final compressor Cn after passing through the high-temperature thermal storage device TS, and the inlet of the gas storage chamber AS; the first The regenerator RG1 absorbs the waste heat discharged by the final stage compressor Cn after releasing heat in the TS, and the air entering the inlet of the x-stage compressor Cx absorbs the heat in the first regenerator RG1 to realize the heat recovery of the final stage compressor Cn The Cx inlet temperature of the x-stage compressor increases the power of the compressor, increases the heat storage ratio, and increases the energy density. As the heat storage temperature increases, the demand for air in the air storage chamber AS decreases, which can significantly reduce the volume of the air storage chamber AS and reduce costs.

CN110715572A discloses a design method and design device of a compressed air energy storage and heat storage system. The design method of the compressed air energy storage and heat storage system includes: based on the working parameters of the expander, the physical parameters of the heat exchange medium, the first heat exchange The size of the cavity determines the number N of sub-regenerators contained in each heat accumulator; based on the temperature difference between the outlet of the front-stage expander and the inlet of the rear-stage expander in the adjacent two-stage expander, and the physical properties of the heat exchange medium Parameters, physical parameters of the heat storage medium, working time of the heat accumulator, number N of sub-regenerators, outer diameter of the first tube, length of the sub-regenerator, determine the thickness δmiddle of the heat storage chamber; based on the first The size of the heat exchange chamber and the thickness δmiddle of the heat storage chamber determine the outer diameter of the second tube and determine the outer diameter of the second heat exchange chamber.

CN208441894U discloses a compressed air energy storage and heat recovery device, comprising a compressed air storage tank, a heat storage heat exchanger and a heat recovery heat exchanger, the outlet of the compressed air storage tank is connected to the intake valve, the The intake valve is connected to the cold-side inlet of the rightmost regenerative heat exchanger, the hot-side outlet of the regenerative heat exchanger is connected to the regenerative temperature control valve, and the regenerative temperature control valve is connected to the inlet of the cold storage tank; The cold side outlet of the heat storage heat exchanger is connected to the heat storage temperature control valve, and the heat storage temperature control valve is connected to the heat storage tank inlet, and the heat storage heat exchanger is adjusted through the heat storage stage to take away the compressed air from the compressor. The heat generated during the operation can achieve the purpose of reducing the outlet temperature of the compressor, and the intake temperature and exhaust temperature of the expander can be adjusted by adjusting the heat recovery temperature control valve in the heat recovery stage, so as to improve the overall efficiency of all expanders.

However, the above-mentioned heat storage technology still has problems such as high cost and large floor area. Therefore, it is of great significance to develop a device system and method for combined energy storage of compressed air and hydrogen-oxygen fuel cells to increase the economy and practicability of compressed air energy storage power generation. important meaning.

Contents of the invention

In view of the problems existing in the prior art, the present invention provides a device system and method for combined energy storage of compressed air and hydrogen-oxygen fuel cells. Polyethylene glycol is used as the heat storage medium, which reduces the pressure of the heat storage device and improves the The safety of heat storage; effectively utilize the heat of the compressed air discharged from the air compression device, improve the power-to-electricity conversion efficiency of compressed air energy storage, and increase the economy of the compressed air energy storage system.

For reaching this purpose, the present invention adopts following technical scheme:

In the first aspect, the present invention provides a device system for combined energy storage of compressed air and hydrogen-oxygen fuel cells. The device system includes a first air compression device, a first catalytic reforming reaction device, and a first intermediate cooling device connected in sequence. , the second air compression device, the second catalytic reforming reaction device, the second intermediate cooling device, the compressed air storage device, the first heating device, the first air turbine, the tail gas condensing device, the second heating device and the second air ventilation flat;

The interior of the first catalytic reforming reaction device is provided with mutually independent first gas passages and first liquid passages; the interior of the first intermediate cooling device is provided with mutually independent second gas passages and second liquid passages; The inside of the second catalytic reforming reaction device is provided with a third gas channel and a third liquid channel that are independent of each other; the inside of the second intermediate cooling device is provided with a fourth gas channel and a fourth liquid channel that are independent of each other;

The device system also includes a methanol-water storage device, a cooling device, a separation and purification device, a gas separation device, an oxygen storage device, a hydrogen storage device and a hydrogen-oxygen fuel cell;

The methanol-water storage device is sequentially connected to the cooling device, the separation and purification device and the gas separation device through the fourth liquid channel, the third liquid channel, the second liquid channel and the first liquid channel; the hydrogen-oxygen fuel cell is respectively connected to the The oxygen storage unit is connected to the hydrogen storage unit.

The combined energy storage device system of compressed air and hydrogen-oxygen fuel cells described in the present invention uses methanol catalytic reforming reaction (reaction formula: CH ₃ OH+H ₂ O→CO ₂ +3H ₂ ) to provide hydrogen for hydrogen-oxygen fuel cells , which effectively utilizes the high-temperature heat generated by the work of the air compression device during energy storage, thereby effectively reducing the operating temperature of the polyethylene glycol storage device and improving the safety of the polyethylene glycol storage device; when releasing energy, the hydrogen-oxygen fuel The battery and the air turbine generate electricity together, which effectively improves the power-to-power conversion efficiency of the entire device system and improves the economy of the compressed air energy storage system. The device system of the invention has a small footprint, high operational safety, and has the potential for large-scale popularization and application.

Preferably, the device system further includes a carbon dioxide storage device.

Preferably, the carbon dioxide storage device is connected to a gas separation device.

Preferably, the hydrogen-oxygen fuel cell is sequentially connected with an exhaust gas condensing device and a methanol-water storage device.

In the present invention, the hydrogen-oxygen fuel cell is preferably connected with the tail gas condensing device and the methanol-water storage device in turn, and the water vapor discharged from the hydrogen-oxygen fuel cell enters the tail gas condensing device to transfer heat to the compressed air after the first air turbine has done work After that, it becomes condensed water, and the condensed water is recycled to the methanol plus deionized water storage device, which can reduce the external supplementary water and achieve the effect of water saving.

Preferably, a first conveying device is provided between the tail gas condensing device and the methanol-water storage device.

Preferably, a second delivery device is provided between the methanol-water storage device and the fourth liquid channel.

Preferably, the separation and purification device is also connected to the methanol-water storage device.

Preferably, the inside of the first heating device is provided with a first polyethylene glycol channel and a fifth gas channel that are independent of each other.

Preferably, the inside of the second heating device is provided with a second polyethylene glycol channel and a sixth gas channel that are independent of each other.

Preferably, the device system further comprises a first polyethylene glycol storage device and a second polyethylene glycol storage device.

Preferably, the first polyethylene glycol storage device is circularly connected to the second polyethylene glycol storage device via the first polyethylene glycol channel and the second polyethylene glycol channel respectively.

Preferably, a third delivery device is provided on the outlet pipeline of the first polyethylene glycol storage device.

Preferably, the second polyethylene glycol storage device, the cooling device and the first polyethylene glycol storage device are connected in sequence.

Preferably, a fourth delivery device is provided between the second polyethylene glycol storage device and the cooling device.

In the present invention, it is preferred that the fourth conveying device is a variable frequency pump, and the polyethylene glycol flow rate is controlled by the variable frequency pump, thereby controlling the temperature of the mixed gas generated from the first catalytic reforming reaction device and the second catalytic reforming reaction device after cooling.

Preferably, the first air compression device and the second air compression device are coaxially connected to the electric motor.

Preferably, the first air turbine and the second air turbine are coaxially connected to the generator.

In the second aspect, the present invention also provides a method for combined energy storage of compressed air and hydrogen-oxygen fuel cells, said method adopts the device system for combined energy storage of compressed air and hydrogen-oxygen fuel cells described in the first aspect; said The method includes an energy storage process and an energy release process.

Preferably, the energy storage process includes: air enters the first air compression device to become the first compressed air, and the first compressed air sequentially passes through the first catalytic reforming reaction device, the first intermediate cooling device and enters the second air compression device. The device becomes the second compressed air; the second compressed air enters the compressed air storage device through the second catalytic reforming reaction device and the second intermediate cooling device for storage;

Methanol and water in the methanol-water storage device are divided into two paths through the second conveying device, one path enters the second intermediate cooling device, the second catalytic reforming reaction device absorbs the heat of the second compressed air, and the other path enters the first The intermediate cooling device and the first catalytic reforming reaction device absorb the heat of the first compressed air and turn it into a mixed gas; the mixed gas enters the cooling device and transfers heat to the polyethylene glycol discharged from the second polyethylene glycol storage device. Diol; the methanol gas and the first water vapor in the mixed gas are condensed into liquid methanol and water, which are separated by a separation and purification device, and the liquid methanol and water are recycled to the methanol-water storage device, and the hydrogen and carbon dioxide in the mixed gas The gas enters the hydrogen storage device and the carbon dioxide storage device respectively through the gas separation device for storage; polyethylene glycol absorbs heat and enters the first polyethylene glycol storage device for storage;

During the energy storage process, the electric motor drives the first air compression device and the second air compression device to perform air compression.

In the present invention, the methanol and water in the methanol-water storage device are preferably divided into two paths through the second delivery device, and a regulating valve is set behind the second delivery device to control the flow of methanol and water entering the two paths, thereby controlling The temperature of the compressed air at the outlet of the first intercooler and the second intercooler.

Preferably, the energy release process includes: the oxygen in the oxygen storage device and the hydrogen in the hydrogen storage device enter together into the hydrogen-oxygen fuel cell for power generation, and at the same time discharge the second water vapor; the second water vapor enters the tail gas condensing device In the process, the heat is transferred to the third compressed air in the first air turbine to become condensed water; the condensed water is recovered to the methanol-water storage device through the first conveying device;

The second compressed air stored in the compressed air storage device first enters the first heating device, absorbs the heat of polyethylene glycol discharged from the first polyethylene glycol storage device, and then enters the first air turbine to do work; the air after doing work enters The tail gas condensing device absorbs the heat of the second water vapor, and then enters the second heating device, absorbs the heat of polyethylene glycol discharged from the first polyethylene glycol storage device, and then enters the second air turbine to do work, and the air after doing work discharge into the atmosphere;

The polyethylene glycol in the first polyethylene glycol storage device is divided into two paths through the third delivery device, one path enters the second heating device, and the other path enters the first heating device, and the heat is transferred to the air; Ethylene glycol enters the second polyethylene glycol storage device for storage;

During the energy release process, the first air turbine and the second air turbine drive the generator to generate electricity.

The combined energy storage method of compressed air and hydrogen-oxygen fuel cells described in the present invention uses polyethylene glycol as the heat storage medium. Compared with water heat storage, the pressure of the heat storage device is lower, which is safer and saves equipment cost; Compared with heat transfer oil heat storage, the price of heat storage medium polyethylene glycol is lower; compared with molten salt heat storage, it can store low-temperature heat; compared with ethylene glycol, polyethylene glycol has a higher flash point and boiling point , so the use temperature is higher and safer. Moreover, the carbon dioxide generated by the methanol catalytic reforming reaction (reaction formula: CH ₃ OH+H ₂ O→CO ₂ +3H ₂ ) is collected and can be used comprehensively to further improve the combined energy storage of compressed air and hydrogen-oxygen fuel cells. economy of the method.

In the present invention, the polyethylene glycol in the first polyethylene glycol storage device is preferably divided into two paths through the third delivery device, and a regulating valve is set after the third delivery device to control the polyethylene glycol entering the two paths. flow, thereby controlling the temperature of the compressed air at the outlet of the first heating device and the second heating device.

Preferably, the air entering the first air compression device is dry air.

Preferably, the pressure of the air entering the first air compression device is the local atmospheric pressure, such as 0.05MPa, 0.06MPa, 0.08MPa, 0.1MPa or 0.11MPa, etc., but not limited to the listed values, the value range Other values not listed in are also applicable; the temperature is the ambient temperature, for example, it can be 10°C, 12°C, 15°C, 20°C, 23°C or 25°C, etc., but it is not limited to the listed values, other values within the range Values not listed also apply.

Preferably, the pressure of the air entering the compressed air storage device is 15-18MPa, such as 15MPa, 15.2MPa, 15.5MPa, 16MPa, 17MPa or 18MPa, etc., but not limited to the listed values. Other unlisted values are also applicable; the temperature is 20-30°C, for example, it can be 5°C, 10°C, 15°C, 20°C, 25°C or 30°C, etc., but it is not limited to the listed values. Other values not listed also apply.

Preferably, the volume ratio of methanol and water in the methanol-water storage device is 1:1 to 1:2, for example, it can be 1:1, 1:1.2, 1:1.5, 1:1.8, 1:1.9 or 1:2, etc., but not limited to the listed values, other unlisted values within this range are also applicable.

In the present invention, it is preferred that the water in the methanol-water storage device is deionized water.

Preferably, both the first polyethylene glycol storage device and the second polyethylene glycol storage device are airtight storage tanks, which are sealed and protected with carbon dioxide or nitrogen.

Preferably, the pressure in the first polyethylene glycol storage device is 0.11-0.2MPa, such as 0.11MPa, 0.12MPa, 0.15MPa, 0.18MPa, 0.19MPa or 0.2MPa, etc., but not limited to the listed The numerical value of , other unlisted numerical values in this numerical range are also applicable. The temperature is 160-190°C, for example, 160°C, 170°C, 180°C or 190°C, etc., but it is not limited to the listed values, and other unlisted values within this range are also applicable.

Preferably, the pressure in the second polyethylene glycol storage device is 0.11-0.2MPa, such as 0.11MPa, 0.12MPa, 0.15MPa, 0.18MPa, 0.19MPa or 0.2MPa, etc., but not limited to the listed The numerical value of , other unlisted numerical values in this numerical range are also applicable. The temperature is 160-190°C, for example, 160°C, 170°C, 180°C or 190°C, etc., but it is not limited to the listed values, and other unlisted values within this range are also applicable.

In the present invention, it is preferred that the pressure in the first polyethylene glycol storage device is 0.11-0.2 MPa, the temperature is 160-190 °C and the pressure in the second polyethylene glycol storage device is 0.11-0.2 MPa, and the temperature is at 160～190℃, to prevent the oxidation of polyethylene glycol at high temperature.

As a preferred technical solution of the present invention, the method includes an energy storage process and an energy release process;

The energy storage process includes: dry air enters the first air compression device to become the first compressed air, and the first compressed air enters the second air compression device through the first catalytic reforming reaction device and the first intermediate cooling device in sequence, become the second compressed air; the second compressed air passes through the second catalytic reforming reaction device and the second intercooler successively and enters the compressed air storage device for storage; the pressure of the air entering the compressed air storage device is 15 ~ 18MPa, the temperature is 20～30℃;

Methanol and water with a volume ratio of 1:1 to 1:2 in the methanol-water storage device are divided into two paths through the second conveying device, and one path enters the second intermediate cooling device and the second catalytic reforming reaction device to absorb the second compression The heat of the air, the other way enters the first intermediate cooling device and the first catalytic reforming reaction device to absorb the heat of the first compressed air and become a mixed gas; the mixed gas enters the cooling device and transfers heat to the The polyethylene glycol discharged from the ethylene glycol storage device; the methanol gas and the first water vapor in the mixed gas are condensed into liquid methanol and water, which are separated by the separation and purification device, and the liquid methanol and water are recovered to methanol-water storage In the device, the hydrogen and carbon dioxide in the mixed gas enter the hydrogen storage device and the carbon dioxide storage device respectively through the gas separation device for storage; polyethylene glycol absorbs heat and enters the first polyethylene glycol storage device for storage;

During the energy storage process, the electric motor drives the first air compression device and the second air compression device to perform air compression;

Preferably, the energy release process includes: the oxygen in the oxygen storage device and the hydrogen in the hydrogen storage device enter together into the hydrogen-oxygen fuel cell for power generation, and at the same time discharge the second water vapor; the second water vapor enters the tail gas condensing device In the process, the heat is transferred to the third compressed air in the first air turbine to become condensed water; the condensed water is recovered to the methanol-water storage device through the first conveying device;

The second compressed air stored in the compressed air storage device first enters the first heating device, absorbs the heat of polyethylene glycol discharged from the first polyethylene glycol storage device, and then enters the first air turbine to do work; the air after doing work enters The tail gas condensing device absorbs the heat of the second water vapor, and then enters the second heating device, absorbs the heat of polyethylene glycol discharged from the first polyethylene glycol storage device, and then enters the second air turbine to do work, and the air after doing work discharge into the atmosphere;

The polyethylene glycol in the first polyethylene glycol storage device is divided into two paths through the third delivery device, one path enters the second heating device, and the other path enters the first heating device, and the heat is transferred to the air; Ethylene glycol enters the second polyethylene glycol storage device for storage;

During the energy release process, the first air turbine and the second air turbine drive the generator to generate electricity;

Both the first polyethylene glycol storage device and the second polyethylene glycol storage device are airtight storage tanks; the pressure inside the first polyethylene glycol storage device is 0.11-0.2MPa, and the temperature is 160-190°C ; The pressure in the second polyethylene glycol storage device is 0.11-0.2MPa, and the temperature is 160-190°C.

Compared with the prior art, the present invention has at least the following beneficial effects:

(1) The combined energy storage device system of compressed air and hydrogen-oxygen fuel cells provided by the present invention combines the advantages of compressed air energy storage and hydrogen-oxygen fuel cells, and uses high-temperature compressed air to heat the raw material methanol and water of hydrogen-oxygen fuel cells, thereby effectively The reduced working temperature of the heat storage device improves the safety of the heat storage device;

(2) When the device system of the combined energy storage of compressed air and hydrogen-oxygen fuel cell provided by the present invention releases energy, the hydrogen-oxygen fuel cell and the air turbine generate electricity together, which effectively improves the electricity-to-electricity conversion efficiency of the whole device system;

(3) The combined energy storage method of compressed air and hydrogen-oxygen fuel cell provided by the present invention uses polyethylene glycol as the heat storage medium, which reduces the equipment cost and saves the energy storage cost, and can also convert the methanol produced by the catalytic reforming reaction Carbon dioxide is collected for comprehensive utilization.

Description of drawings

Fig. 1 is a schematic structural diagram of a combined energy storage device system of compressed air and hydrogen-oxygen fuel cells provided by the present invention.

In the figure: 1-first air compression device; 2-second air compression device; 3-electric motor; 4-first catalytic reforming reaction device; 5-first intermediate cooling device; 6-second catalytic reforming reaction device ; 7-the second intermediate cooling device, 8-the first polyethylene glycol storage device; 9-the second polyethylene glycol storage device; 10-cooling device; 11-separation and purification device; 12-gas separation device; 13- Compressed air storage device; 14-methanol-water storage device; 15-oxygen storage device; 16-hydrogen storage device; 17-carbon dioxide storage device; 18-hydrogen fuel cell; 19-first heating device; 20-tail gas condensing device ; 21-the second heating device; 22-the first air turbine; 23-the second air turbine; 24-generator; 28 - First delivery device.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

The present invention will be further described in detail below. However, the following examples are only simple examples of the present invention, and do not represent or limit the protection scope of the present invention, and the protection scope of the present invention shall be determined by the claims.

It should be understood that in the description of the present invention, terms such as "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features . Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

It should be noted that, in the description of the present invention, unless otherwise clearly stipulated and limited, the terms "set", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention based on specific situations.

It should be understood by those skilled in the art that the present invention must include the necessary pipelines, conventional valves and general-purpose pump equipment for realizing the integrity of the process, but the above content does not belong to the main invention points of the present invention, and those skilled in the art can The layout can be added by itself according to the selection of the equipment structure, and the present invention does not make special requirements and specific limitations on this.

As a specific embodiment of the present invention, a combined energy storage device system of compressed air and hydrogen-oxygen fuel cells is provided, and its structural schematic diagram is shown in FIG. 1 .

The device system includes a first air compression device 1, a first catalytic reforming reaction device 4, a first intermediate cooling device 5, a second air compression device 2, a second catalytic reforming reaction device 6, and a second intermediate cooling device connected in sequence. Cooling device 7, compressed air storage device 13, first heating device 19, first air turbine 22, tail gas condensing device 20, second heating device 21 and second air turbine 23;

The inside of the first catalytic reforming reaction device 4 is provided with mutually independent first gas passages and first liquid passages; the inside of the first intermediate cooling device 5 is provided with mutually independent second gas passages and second liquid passages. channel; the inside of the second catalytic reforming reaction device 6 is provided with a third gas channel and a third liquid channel that are independent of each other; the inside of the second intermediate cooling device 7 is provided with a fourth gas channel and a first Four liquid channels;

The device system also includes a methanol-water storage device 14, a cooling device 10, a separation and purification device 11, a gas separation device 12, an oxygen storage device 15, a hydrogen storage device 16 and a hydrogen-oxygen fuel cell 18;

The methanol-water storage device 14 is sequentially connected with the cooling device 10, the separation and purification device 11 and the gas separation device 12 through the fourth liquid channel, the third liquid channel, the second liquid channel and the first liquid channel; The fuel cell 18 is connected to the oxygen storage device 15 and the hydrogen storage device 16 respectively.

The device system also includes a carbon dioxide storage device 17;

The carbon dioxide storage device 17 is connected with the gas separation device 12 .

The hydrogen-oxygen fuel cell 18 is sequentially connected with the tail gas condensing device 20 and the methanol-water storage device 14;

A first conveying device 28 is arranged between the tail gas condensing device 20 and the methanol-water storage device 14;

A second delivery device 27 is provided between the methanol-water storage device 14 and the fourth liquid channel.

The separation and purification device 11 is also connected to a methanol-water storage device 14 .

The inside of the first heating device 19 is provided with a first polyethylene glycol channel and a fifth gas channel which are independent of each other;

The inside of the second heating device 21 is provided with a second polyethylene glycol channel and a sixth gas channel which are independent of each other.

The device system also includes a first polyethylene glycol storage device 8 and a second polyethylene glycol storage device 9;

The first polyethylene glycol storage device 8 is circularly connected with the second polyethylene glycol storage device 9 through the first polyethylene glycol channel and the second polyethylene glycol channel respectively;

The outlet pipeline of the first polyethylene glycol storage device 8 is provided with a third delivery device 25;

The second polyethylene glycol storage device 9, the cooling device 10 and the first polyethylene glycol storage device 8 are sequentially connected;

A fourth delivery device 26 is provided between the second polyethylene glycol storage device 9 and the cooling device 10 .

The first air compression device 1 and the second air compression device 2 are coaxially connected with the motor 3;

The first air turbine 22 and the second air turbine 23 are coaxially connected with a generator 24 .

As a specific embodiment of the present invention, a method for combined energy storage of compressed air and hydrogen-oxygen fuel cells is also provided, and the method is carried out by using the above-mentioned device system for combined energy storage of compressed air and hydrogen-oxygen fuel cells; the method Including energy storage process and energy release process.

The energy storage process includes: dry air with a pressure of 0.1MPa and a temperature of 20°C enters the first air compression device 1 to become the first compressed air with a pressure of 1.4MPa and a temperature of 400°C, and the first compressed air is sequentially Through the first catalytic reforming reaction device 4, the pressure is 1.4MPa, the temperature is reduced to 220°C, and the heat is transferred to methanol and deionized water by entering the first intermediate cooling device 5, the pressure is 1.4MPa, and the air temperature is reduced to 30°C; After entering the second air compression device 2, it becomes the second compressed air with a pressure of 17MPa and a temperature of 400°C; the second compressed air passes through the second catalytic reforming reaction device 6 successively with a pressure of 17MPa and a temperature of 220°C ℃, enter the second intermediate cooling device 7, the pressure is 17MPa, the temperature is reduced to 30°C, and enters the compressed air storage device 13, the pressure is 17MPa, and the temperature is reduced to 30°C for storage;

The volume ratio of methanol and water in the methanol-water storage device 14 is 1:1, and the temperature is 20°C. After passing through the second conveying device 27, it is divided into two paths, and one path enters the second intermediate cooling device 7 in turn, and the temperature rises to 200°C. , enter the second catalytic reforming reaction device 6 to absorb the heat of the second compressed air, and the other way enters the first intermediate cooling device 5 in turn, the temperature rises to 200 ° C, and the first catalytic reforming reaction device 4 absorbs the heat of the first compressed air The heat becomes a mixed gas with a temperature of 200°C; the mixed gas enters the cooling device 10 and transfers heat to the polyethylene glycol discharged from the second polyethylene glycol storage device 9, and the temperature of the mixed gas becomes 40°C , the temperature of polyethylene glycol is 190°C; the methanol gas and the first water vapor in the mixed gas are condensed into liquid methanol and water, which are separated by the separation and purification device 11, and the liquid methanol and water are recovered to the methanol-water storage device In 14, the hydrogen and carbon dioxide in the mixed gas enter the hydrogen storage device 16 and the carbon dioxide storage device 17 respectively through the gas separation device 12 for storage; the polyethylene glycol with a temperature of 190°C absorbs heat and then enters the first polyethylene glycol storage The device 8 stores;

During the energy storage process, the electric motor 3 drives the first air compression device 1 and the second air compression device 2 to perform air compression.

The energy release process includes: the oxygen in the oxygen storage device 15 and the hydrogen in the hydrogen storage device 16 enter the hydrogen-oxygen fuel cell 18 to generate electricity, and at the same time discharge the second water vapor with a temperature of 80 ° C; the second water vapor The steam enters the tail gas condensing device 20, transfers heat to the third compressed air in the first air turbine 22, and then turns into condensed water with a temperature of 20°C; the condensed water is recovered to methanol-water through the first conveying device 28 In the storage device 14;

The pressure stored in the compressed air storage device 13 is 17MPa, and the second compressed air with a temperature of 30°C first enters the first heating device 19 to absorb the heat of polyethylene glycol discharged from the first polyethylene glycol storage device 8, and the temperature is Raise to 180°C; enter the first air turbine 22 to do work; the air pressure after the work is 1.4MPa, the temperature is -30°C, enter the tail gas condensing device 20 to absorb the heat of the second water vapor, and the temperature rises to 30°C, Then enter the second heating device 21, absorb the heat of polyethylene glycol discharged from the first polyethylene glycol storage device 8, and the temperature rises to 180°C; the pressure is 1.4MPa, and the air at a temperature of 180°C enters the second The air turbine 23 performs work, and the air pressure after the work is 0.12MPa, the temperature is 0°C, and the air is discharged into the atmosphere;

The polyethylene glycol with a temperature of 190°C in the first polyethylene glycol storage device 8 is divided into two paths through the third delivery device, one path enters the second heating device 21, and the other path enters the first heating device 19 to transfer heat The air is supplied, and the polyethylene glycol with a temperature of 35° C. after heat release enters the second polyethylene glycol storage device 9 for storage;

During the energy release process, the first air turbine 22 and the second air turbine 23 drive the generator 24 to generate electricity.

In summary, the device system and method for combined energy storage of compressed air and hydrogen-oxygen fuel cells provided by the present invention combines the advantages of compressed air energy storage and hydrogen-oxygen fuel cells, and uses high-temperature compressed air to heat the raw material methanol of hydrogen-oxygen fuel cells. and water, thereby effectively reducing the working temperature of the heat storage device and improving the safety of the heat storage device; when the device system releases energy, the hydrogen-oxygen fuel cell and the air turbine generate electricity together, which effectively improves the safety of the entire device system. Electricity-to-electricity conversion efficiency; the use of polyethylene glycol as the heat storage medium reduces the cost of equipment and saves energy storage costs. It can also collect carbon dioxide generated by the catalytic reforming reaction of methanol for comprehensive utilization. It has large-scale popularization and application prospect.

The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent replacement of selected components in the present invention, the addition of auxiliary components, the selection of specific methods, etc., all fall within the scope of protection and disclosure of the present invention.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention. These simple modifications All belong to the protection scope of the present invention.

Claims (10)

1. A device system for jointly storing energy of compressed air and a hydrogen-oxygen fuel cell is characterized by comprising a first air compression device, a first catalytic reforming reaction device, a first intermediate cooling device, a second air compression device, a second catalytic reforming reaction device, a second intermediate cooling device, a compressed air storage device, a first heating device, a first air turbine, a tail gas condensation device, a second heating device and a second air turbine which are sequentially connected;

a first gas channel and a first liquid channel which are mutually independent are arranged in the first catalytic reforming reaction device; a second gas channel and a second liquid channel which are mutually independent are arranged in the first intermediate cooling device; a third gas channel and a third liquid channel which are mutually independent are arranged in the second catalytic reforming reaction device; a fourth gas channel and a fourth liquid channel which are mutually independent are arranged in the second intermediate cooling device;

the device system also comprises a methanol-water storage device, a cooling device, a separation and purification device, a gas separation device, an oxygen storage device, a hydrogen storage device and a hydrogen-oxygen fuel cell;

the methanol-water storage device is sequentially connected with the cooling device, the separation and purification device and the gas separation device through a fourth liquid channel, a third liquid channel, a second liquid channel and a first liquid channel; the hydrogen-oxygen fuel cell is respectively connected with the oxygen storage device and the hydrogen storage device.

2. The device system of claim 1, further comprising a carbon dioxide storage device;

preferably, the carbon dioxide storage means is connected to a gas separation means.

3. The plant system according to claim 1 or 2, wherein the hydrogen-oxygen fuel cell is connected to a tail gas condensing unit and a methanol-water storage unit in this order;

preferably, a first conveying device is arranged between the tail gas condensing device and the methanol-water storage device;

preferably, a second conveying device is arranged between the methanol-water storage device and the fourth liquid channel.

4. The plant system according to any one of claims 1 to 3, wherein the separation and purification unit is further connected to a methanol-water storage unit.

5. The device system according to any one of claims 1 to 4, wherein the first heating device is provided therein with a first polyethylene glycol channel and a fifth gas channel which are independent of each other;

preferably, the second heating device is internally provided with a second polyethylene glycol channel and a sixth gas channel which are independent of each other.

6. The device system of any one of claims 1-5, further comprising a first polyethylene glycol reservoir and a second polyethylene glycol reservoir;

preferably, the first polyethylene glycol storage device is circularly connected with the second polyethylene glycol storage device through a first polyethylene glycol channel and a second polyethylene glycol channel respectively;

preferably, a third conveying device is arranged on an outlet pipeline of the first polyethylene glycol storage device;

preferably, the second polyethylene glycol storage device, the cooling device and the first polyethylene glycol storage device are connected in sequence;

preferably, a fourth conveying device is arranged between the second polyethylene glycol storage device and the cooling device.

7. The device system according to any one of claims 1 to 6, wherein the first air compression device and the second air compression device are coaxially connected with an electric motor;

preferably, the first air turbine and the second air turbine are coaxially connected to a generator.

8. A method for storing energy by combining compressed air and a hydrogen-oxygen fuel cell, which is characterized by adopting the device system for storing energy by combining compressed air and a hydrogen-oxygen fuel cell according to any one of claims 1 to 7; the method comprises an energy storage process and an energy release process.

9. The method of claim 8, wherein the energy storage process comprises: air enters a first air compression device to be changed into first compressed air, and the first compressed air sequentially enters a second air compression device through a first catalytic reforming reaction device and a first intermediate cooling device to be changed into second compressed air; the second compressed air sequentially passes through a second catalytic reforming reaction device and a second intermediate cooling device and enters a compressed air storage device to be stored;

methanol and water in the methanol-water storage device are divided into two paths through a second conveying device, one path of the methanol and water sequentially enters a second intermediate cooling device and a second catalytic reforming reaction device to absorb the heat of second compressed air, and the other path of the methanol and water sequentially enters a first intermediate cooling device and a first catalytic reforming reaction device to absorb the heat of first compressed air to form mixed gas; the mixed gas enters a cooling device and transfers heat to polyethylene glycol discharged from a second polyethylene glycol storage device; the methanol gas and the first steam in the mixed gas are condensed into liquid methanol and water, the liquid methanol and the liquid water are separated by a separation and purification device, the liquid methanol and the liquid water are recovered to a methanol-water storage device, and the hydrogen gas and the carbon dioxide gas in the mixed gas respectively enter a hydrogen storage device and a carbon dioxide storage device for storage through a gas separation device; the polyethylene glycol absorbs heat and then enters a first polyethylene glycol storage device for storage;

in the energy storage process, the motor drives the first air compression device and the second air compression device to compress air;

preferably, the energy release process comprises: the oxygen in the oxygen storage device and the hydrogen in the hydrogen storage device enter the hydrogen-oxygen fuel cell together to generate electricity, and second water vapor is discharged; the second steam enters a tail gas condensing device, and heat is transferred to third compressed air in the first air turbine to be converted into condensed water; the condensed water is recycled to the methanol-water storage device through the first conveying device;

the second compressed air stored in the compressed air storage device firstly enters the first heating device, absorbs the heat of the polyethylene glycol discharged from the first polyethylene glycol storage device and then enters the first air turbine to do work; the air after acting enters a tail gas condensing device to absorb the heat of second water vapor, then enters a second heating device to absorb the heat of polyethylene glycol discharged from a first polyethylene glycol storage device, then enters a second air turbine to act, and the air after acting is discharged to the atmosphere;

polyethylene glycol in the first polyethylene glycol storage device is divided into two paths by a third conveying device, wherein one path enters the second heating device, and the other path enters the first heating device to transfer heat to air; the polyethylene glycol after heat release enters a second polyethylene glycol storage device for storage;

in the energy releasing process, the first air turbine and the second air turbine drive the generator to generate electricity.

10. The method of claim 8 or 9, wherein the air entering the first air compressing device is dry air;

preferably, the pressure of the air entering the compressed air storage device is 15-18 MPa, and the temperature is 20-30 ℃;

preferably, the volume ratio of methanol to water in the methanol-water storage device is 1;

preferably, the first polyethylene glycol storage device and the second polyethylene glycol storage device are both closed storage tanks;

preferably, the pressure in the first polyethylene glycol storage device is 0.11-0.2 MPa, and the temperature is 160-190 ℃;

preferably, the pressure in the second polyethylene glycol storage device is 0.11-0.2 MPa, and the temperature is 160-190 ℃.

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