Combined power and heat generation system

Abstract

The present application relates to a combined power and heat generation system, comprising a gas compression apparatus, a gas expansion apparatus, a first heat exchange apparatus, and a heating apparatus. The gas compression apparatus is provided with a first gas inlet and a first gas outlet which are in communication with one another. The gas expansion apparatus is electrically connected to a power storage apparatus. The gas expansion apparatus is provided with a second gas inlet and a second gas outlet which are in communication with one another, and the second gas outlet is used for discharging gas. The first heat exchange apparatus is provided with a first inlet and a first outlet which are in communication with one another. The first inlet is in communication with the first gas outlet, and the first outlet is in communication with the second gas inlet. The heating apparatus can exchange heat with the first heat exchange apparatus. Compared with the conventional technology, the above combined power and heat generation system can simultaneously achieve heating and power generation, can meet power consumption and heating requirements of residents without having to separately construct a power station and a heating station, occupies a small area, and has low construction costs.

Description

Cogeneration system Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a combined heat and power system. Background Technology

[0002] In winter, coastal cities in northern my country have not only a demand for electricity but also for heating. This is usually met by building power plants and heating stations. However, this method requires a large land area, resulting in high construction costs.

[0003] Summary of the Invention

[0004] Therefore, it is necessary to provide a combined power and heat system to address the problem of high construction costs caused by the large land area occupied by power plants and heating stations.

[0005] The technical solution is as follows:

[0006] One embodiment provides a combined heat and power system, comprising:

[0007] A gas compression device having a first air inlet and a first air outlet connected in communication;

[0008] A gas expansion device is used to be electrically connected to a storage device. The gas expansion device has a second air inlet and a second air outlet connected in communication. The second air outlet is used to discharge gas.

[0009] A first heat exchange device, the first heat exchange device having a first inlet and a first outlet connected in communication, the first inlet being connected to a first air outlet, the first outlet being connected to a second air inlet; and

[0010] A heating device, which is capable of exchanging heat with the first heat exchange device.

[0011] In the aforementioned combined heat and power (CHP) system, gas enters a gas compression device through a first inlet. The gas compression device compresses the gas to obtain high-pressure gas. During the compression process, the high-pressure gas carries a certain amount of heat of compression. The high-pressure gas with this heat of compression exits through a first outlet and enters a first heat exchanger through a first inlet. The heat of compression carried by the high-pressure gas is transferred to the first heat exchanger, which then exchanges heat with a heating device to transfer the heat of compression to the heating device for heating. After heat transfer in the first heat exchanger, the high-pressure gas exits through a first outlet and enters a gas expansion device through a second inlet. The high-pressure gas expands in the gas expansion device and outputs external work to generate electricity. Finally, the generated electricity is transmitted to an energy storage device. Compared with traditional technologies, the aforementioned CHP system can simultaneously provide heating and power generation, solving the electricity and heating needs of residents without the need to build separate power plants and heating plants. It also has a small footprint and low construction cost.

[0012] In one embodiment, the combined heat and power system further includes a heat storage device and a cold storage device. The heat storage device is used to store a heat medium, and the cold storage device is used to store a cold medium. The first heat exchange device includes a first refrigeration module and a first heating module. The first refrigeration module has a first inlet and a first outlet connected together, and the first heating module has a second inlet and a second outlet connected together. The first refrigeration module is capable of heat exchange with the first heating module. The second inlet and the heating device are both connected to the cold storage device, and the second outlet and the heating device are both connected to the heat storage device.

[0013] In one embodiment, the heat storage device is provided with a heat storage cavity, a heat inlet and a heat outlet, and the cold storage device is provided with a cold storage cavity, a cold inlet and a cold outlet. The heat storage cavity is used to store the heat medium, the cold storage cavity is used to store the cold medium, the cold outlet is connected to the second inlet, the second outlet is connected to the heat inlet, the heat outlet is connected to the heating device, and the heating device is connected to the cold inlet.

[0014] In one embodiment, the combined heat and power system further includes a second heat exchange device, which has a third inlet and a third outlet connected in communication. The third inlet is connected to the first outlet, and the third outlet is connected to the second air inlet. The second heat exchange device is connected to the heat storage chamber and is capable of exchanging heat with the heat medium.

[0015] In one embodiment, the second heat exchange device includes a second heating module and a second cooling module. The second heating module has a connected third inlet and a third outlet, and the second cooling module has a connected fourth inlet and a fourth outlet. The second heating module and the second cooling module are capable of heat exchange. The fourth inlet is connected to the heat outlet, and the fourth outlet is connected to the cold inlet.

[0016] In one embodiment, at least two gas compression devices and two corresponding first heat exchange devices are provided, and the gas compression devices and the first heat exchange devices are arranged alternately. Each adjacent gas compression device and the first heat exchange device are combined to form a compression heat exchange unit, and the first outlet of the preceding compression heat exchange unit is connected to the first inlet of the following compression heat exchange unit; or / and,

[0017] The second heat exchange device and the gas expansion device are provided in at least two and are arranged in a one-to-one correspondence. The second heat exchange device and the gas expansion device are arranged alternately. Each adjacent second heat exchange device and gas expansion device are combined to form a heat exchange expansion unit. The second gas outlet of the previous heat exchange expansion unit is connected to the third inlet of the next heat exchange expansion unit.

[0018] In one embodiment, the combined heat and power system further includes a base, a gas storage device, and a gas transmission pipeline. The base has a first side and a second side. The first side is for placement on the water surface. The first heat exchange device and the second heat exchange device are both located on the second side. The gas storage device is located on the first side and has a connected gas storage chamber and a vent. One end of the gas transmission pipeline is connected to the vent, and the other end of the gas transmission pipeline has a first gas transmission branch and a second gas transmission branch. The first gas transmission branch is connected to the first outlet, and the second gas transmission branch is connected to the third inlet.

[0019] In one embodiment, the gas storage device is further provided with a liquid inlet and a liquid outlet, both of which are connected to the gas storage chamber.

[0020] In one embodiment, the heating device includes a heat exchange pipe section and a heating pipe section. One end of the heat exchange pipe section is connected to the heat outlet, and the other end of the heat exchange pipe section is connected to the cold inlet. The heating pipe section is capable of exchanging heat with the heat exchange pipe section.

[0021] In one embodiment, the heating device is provided with at least two, and the heat exchange pipe section of the preceding heating device is connected to the heat exchange pipe section of the subsequent heating device. Attached Figure Description

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

[0023] Figure 1 is a schematic diagram of the overall structure of a combined heat and power system in one embodiment of this application.

[0024] Figure 2 is a schematic diagram of a part of a combined heat and power system in one embodiment of this application.

[0025] Figure 3 is a schematic diagram of the structure of the compression heat exchange unit in one embodiment of this application.

[0026] Figure 4 is a schematic diagram of another part of the cogeneration system in one embodiment of this application.

[0027] Figure 5 is a schematic diagram of the structure of the heat exchange expansion unit in one embodiment of this application.

[0028] Figure 6 is a schematic diagram of the structure of the first heat exchange device in one embodiment of this application.

[0029] Figure 7 is a schematic diagram of the structure of the second heat exchange device in one embodiment of this application.

[0030] Figure 8 is a schematic diagram of the heating device in one embodiment of this application.

[0031] Figure labeling: 100, Gas compression device; 110, First air inlet; 120, First air outlet; 130, Compression heat exchange unit; 200, Gas expansion device; 210, Second air inlet; 220, Second air outlet; 230, Heat exchange expansion unit; 300, First heat exchange device; 310, First refrigeration module; 311, First inlet; 312, First outlet; 320, First heating module; 321, Second inlet; 322, Second outlet; 400, Heating device; 410, Heat exchange pipe section; 420, Heating pipe section; 500, Heat storage device; 510, Heat inlet; 520, Heat outlet; 600, Cold storage device; 610, Cold inlet; 620, Cold outlet; 700 Waste heat recovery device; 800 Second heat exchange device; 810 Second heating module; 811 Third inlet; 812 Third outlet; 820 Second refrigeration module; 821 Fourth inlet; 822 Fourth outlet; 910 Base; 911 First side; 912 Second side; 920 Gas storage device; 921 Vent; 922 Liquid inlet; 923 Liquid outlet; 930 Gas pipeline; 931 First gas branch; 932 Second gas branch; 933 First valve; 934 Second valve. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0038] Please refer to Figures 1 to 7. One embodiment of this application provides a combined heat and power (CHP) system, including a gas compression device 100, a gas expansion device 200, a first heat exchange device 300, and a heating device 400. The gas compression device 100 has a first inlet 110 and a first outlet 120 connected in series. The gas expansion device 200 is used to be electrically connected to an energy storage device and has a second inlet 210 and a second outlet 220 connected in series. The second outlet 220 is used to discharge gas. The first heat exchange device 300 is provided with a first inlet 311 and a first outlet 312 connected in series. The first inlet 311 is connected to the first outlet 120, and the first outlet 312 is connected to the second inlet 210. The heating device 400 is capable of exchanging heat with the first heat exchange device 300.

[0039] In the aforementioned combined heat and power system, gas enters the gas compression device 100 through the first inlet 110. The gas compression device 100 compresses the gas to obtain high-pressure gas. During the compression process, the high-pressure gas carries a certain amount of heat of compression. The high-pressure gas with this heat of compression is discharged from the first outlet 120 and enters the first heat exchange device 300 through the first inlet 311. This allows the heat of compression carried by the high-pressure gas to be transferred to the first heat exchange device 300. The first heat exchange device 300 then exchanges heat with the heating device 400 to further reduce the heat of compression. Heat is transferred to the heating device 400 for heating. After heat transfer is completed in the first heat exchange device 300, the high-pressure gas is discharged from the first outlet 312 and enters the gas expansion device 200 through the second air inlet 210. The high-pressure gas expands in the gas expansion device 200 and outputs external work to generate electricity. Finally, the generated electricity is transmitted to the energy storage device. Compared with traditional technology, the above-mentioned combined heat and power system can realize heating and power generation at the same time. It can solve the electricity and heating needs of residents without building separate power plants and heating plants. It has a small footprint and low construction cost.

[0040] For illustrative purposes, the gas in the above embodiments can be air. The first air inlet 110 of the gas expansion device 200 is connected to the outside world so that outside air is introduced into the gas compression device 100 through the first air inlet 110. The gas compression device 100 compresses the air to obtain high-pressure air with compression heat. The high-pressure air enters the first heat exchange device 300 from the first inlet 311 so that the compression heat carried by the high-pressure air is transferred to the heating device 400 through the first heat exchange device 300 for subsequent heating. It can be understood that the gas in the above embodiments can also be other types of gas besides air, and no specific limitation is made here.

[0041] Furthermore, the high-pressure gas enters the gas expansion device 200 through the second air inlet 210. The high-pressure gas expands and depressurizes within the gas expansion device 200 to output external work. The gas expansion device 200 converts this external work into electrical energy and transmits it to the energy storage device to generate electricity.

[0042] As an explanation, the energy storage device in the above embodiments can be an energy storage device or a device directly connected to the power grid. The gas expansion device 200 transmits the generated electrical energy to the energy storage device and then to the power grid for use. In other embodiments, the gas expansion device 200 can also be directly connected to the power grid to transmit electrical energy directly to the power grid for use.

[0043] Please refer to Figures 1 to 7. In one embodiment, the combined heat and power system further includes a heat storage device 500 and a cold storage device 600. The heat storage device 500 is used to store a heat medium, and the cold storage device 600 is used to store a cold medium. The first heat exchange device 300 includes a first refrigeration module 310 and a first heating module 320. The first refrigeration module 310 has a first inlet 311 and a first outlet 312 that are connected. The first heating module 320 has a second inlet 321 and a second outlet 322 that are connected. The first refrigeration module 310 is capable of exchanging heat with the first heating module 320. The second inlet 321 and the heating device 400 are both connected to the cold storage device 600, and the second outlet 322 and the heating device 400 are both connected to the heat storage device 500.

[0044] The cold medium in the cold storage device 600 is discharged and enters the first heating module 320 through the second inlet 321. The high-pressure gas with compression heat enters the first refrigeration module 310 through the first inlet 311. The cold medium in the first heating module 320 exchanges heat with the high-pressure gas with compression heat in the first refrigeration module 310, so that the high-pressure gas transfers its own compression heat to the cold medium, causing the cold medium to become a hot medium. The hot medium is discharged from the second outlet 322 and enters the heat storage device 500. The hot medium in the heat storage device 500 is discharged and enters the heating device 400. The hot medium transfers its own heat to the heating device 400. At this time, the hot medium becomes a cold medium. The cold medium is then discharged from the heating device 400 and enters the cold storage device 600. This cycle repeats to achieve heating. This setting not only achieves effective heating, but also allows for the reuse of the heat exchange medium, saving energy and being more environmentally friendly.

[0045] Referring to Figure 2, in one embodiment, the heat storage device 500 is provided with a connected heat storage cavity, a heat inlet 510, and a heat outlet 520, and the cold storage device 600 is provided with a connected cold storage cavity, a cold inlet 610, and a cold outlet 620. The heat storage cavity is used to store the heat medium, the cold storage cavity is used to store the cold medium, the cold outlet 620 is connected to the second inlet 321, the second outlet 322 is connected to the heat inlet 510, the heat outlet 520 is connected to the heating device 400, and the heating device 400 is connected to the cold inlet 610.

[0046] The cold medium in the cold storage chamber is discharged from the cold outlet 620 and enters the first heating module 320 through the second inlet 321. The high-pressure gas with compression heat enters the first refrigeration module 310 through the first inlet 311. The cold medium in the first heating module 320 and the high-pressure gas with compression heat in the first refrigeration module 310 exchange heat, so that the high-pressure gas transfers its own compression heat to the cold medium, causing the cold medium to become a hot medium. The hot medium is discharged from the second outlet 322 and enters the heat storage chamber through the heat inlet 510. The hot medium in the heat storage chamber is discharged from the heat outlet 520 and enters the heating device 400. The hot medium transfers its own heat to the heating device 400. At this time, the hot medium becomes a cold medium. The cold medium is then discharged from the heating device 400 and enters the cold storage chamber through the cold inlet 610. This cycle repeats to achieve heating. This setting not only achieves effective heating, but also allows for the reuse of the heat exchange medium, saving energy and being more environmentally friendly.

[0047] Optionally, the heat medium and cold medium in the above embodiments can be liquid heat exchange mediums such as water and oil, or gas heat exchange mediums, etc., without specific limitations here; preferably, water is used as the heat exchange medium, which is low in cost and has reliable heat exchange effect.

[0048] For illustrative purposes, in the above embodiments, the heat inlet 510 represents a port for entering the heat medium, the heat outlet 520 represents a port for discharging the heat medium, the cold outlet 620 represents a port for discharging the cold medium, and the cold inlet 610 represents a port for entering the cold medium.

[0049] Referring to Figure 1, in one embodiment, the cogeneration system further includes a waste heat recovery device 700, with a fourth outlet 822 connected to the waste heat recovery device 700 and the waste heat recovery device 700 connected to the cold storage chamber; the waste heat recovery device 700 can recover waste heat from the heat exchange medium after heat exchange, thereby improving the heat generation efficiency of the cogeneration system.

[0050] Please refer to Figures 1 to 7. In one embodiment, the combined heat and power system further includes a second heat exchange device 800. The second heat exchange device 800 is provided with a third inlet 811 and a third outlet 812 that are connected. The third inlet 811 is connected to the first outlet 312, and the third outlet 812 is connected to the second air inlet 210. The second heat exchange device 800 is connected to the heat storage chamber and can exchange heat with the heat medium.

[0051] The high-pressure gas with heat of compression after being compressed by the gas compression device 100 passes through the first refrigeration module 310 and its temperature decreases. The gas with the decreased temperature is discharged from the first outlet 312 and enters the second heat exchange device 800 through the third inlet 811. The heat storage device 500 can transfer the heat of the heat exchange medium in the heat storage chamber to the second heat exchange device 800 to heat the gas in the second heat exchange device 800. The pressure of the heated gas increases. The gas with increased pressure is discharged from the third outlet 812 and enters the gas expansion device 200 through the second air inlet 210. The gas with increased pressure expands and decreases its pressure in the gas expansion device 200 to output more external work, so that the gas expansion device 200 can generate more electrical energy and improve the power generation efficiency.

[0052] Furthermore, the heat storage device 500 can exchange heat with the second heat exchange device 800 to transfer the heat of the heat medium in the heat storage chamber to the gas in the second heat exchange device 800. After being heated, the gas in the second heat exchange device 800 increases in pressure. The gas with increased pressure expands and decreases in pressure in the gas expansion device 200 to output more external work, thereby generating more electrical energy and improving power generation efficiency.

[0053] Referring to Figure 7, in one embodiment, the second heat exchange device 800 includes a second heating module 810 and a second cooling module 820. The second heating module 810 has a third inlet 811 and a third outlet 812 that are connected. The second cooling module 820 has a fourth inlet 821 and a fourth outlet 822 that are connected. The second heating module 810 and the second cooling module 820 are capable of heat exchange. The fourth inlet 821 is connected to the heat outlet 520, and the fourth outlet 822 is connected to the cold inlet 610.

[0054] The heat medium in the heat storage chamber is discharged from the heat outlet 520 and enters the second refrigeration module 820 through the fourth inlet 821. The low-temperature gas, after heat exchange in the first refrigeration module 310, is discharged from the first outlet 312 and enters the second heating module 810 through the third inlet 811. The low-temperature gas in the second heating module 810 exchanges heat with the heat medium in the second refrigeration module 820, so that the heat medium transfers its own heat to the low-temperature gas. After being heated, the pressure of the low-temperature gas increases. The gas with increased pressure is discharged from the third outlet 812 and enters the gas expansion device 200. The gas with increased pressure expands and decreases in pressure in the gas expansion device 200 to output more external work, so that the gas expansion device 200 can generate more electrical energy and improve power generation efficiency.

[0055] As a supplement, during the non-heating season (such as late spring or summer), the heat medium in the heat storage device 500 exchanges heat with the second heat exchange device 800 to heat the gas and improve the power generation efficiency of the gas expansion device 200. During the heating season (such as late autumn or winter), part of the heat medium in the heat storage device 500 enters the second heat exchange device 800 for heat exchange to heat the gas and improve the power generation efficiency of the gas expansion device 200, while the other part of the heat medium exchanges heat with the heating device 400. In this process, priority should be given to the heat exchange between the heat exchange medium and the heating device 400 to ensure the heating effect and thus ensure "power generation based on heat".

[0056] Please refer to Figure 3. In one embodiment, at least two gas compression devices 100 and one heat exchange device 300 are provided and are arranged in a one-to-one correspondence. The gas compression devices 100 and the first heat exchange devices 300 are arranged alternately. Each adjacent gas compression device 100 and the first heat exchange device 300 are combined to form a compression heat exchange unit 130. The first outlet 312 of the previous compression heat exchange unit 130 is connected to the first air inlet 110 of the next compression heat exchange unit 130.

[0057] By setting at least two compression heat exchange units 130, the gas can be compressed in multiple stages and the compressed gas can absorb heat in multiple stages. In this way, not only can the gas have a higher pressure to release more external work for power generation, but it can also absorb more heat of compression of the gas for heating, thereby further improving the efficiency of power generation and heating.

[0058] Specifically, in the embodiment shown in Figure 3, the compression heat exchange unit 130 is provided with three units, namely a first compression heat exchange unit 130, a second compression heat exchange unit 130, and a third compression heat exchange unit 130. The first air inlet 110 of the first compression heat exchange unit 130 is used to introduce gas. After the gas is compressed and heat exchanged by the first compression heat exchange unit 130, it enters the gas compression device 100 of the second compression heat exchange unit 130 from the first air inlet 110. After being compressed and heat exchanged by the second compression heat exchange unit 130, it enters the gas compression device 100 of the third heat exchange unit from the first air inlet 110. Finally, it is discharged from the first outlet 312 of the third compression heat exchange unit 130.

[0059] Furthermore, the gas compression device 100 in the first compression heat exchange unit 130, the gas compression device 100 in the second compression heat exchange unit 130, and the gas compression device 100 in the third compression heat exchange unit 130 are coaxial and connected to the same motor.

[0060] Taking the above embodiment as an example, when the compression heat exchange unit 130 is provided in other quantities, it is similar to the above embodiment, and will not be described again here.

[0061] As an embodiment that can be implemented simultaneously with the above embodiments, at least two of the second heat exchange device 800 and the gas expansion device 200 are provided and are arranged in a one-to-one correspondence. The second heat exchange device 800 and the gas expansion device 200 are arranged alternately. Each adjacent second heat exchange device 800 and gas expansion device 200 are combined to form a heat exchange expansion unit 230. The second outlet 220 of the previous heat exchange expansion unit 230 is connected to the third inlet 811 of the next heat exchange expansion unit 230.

[0062] By setting at least two heat exchange expansion units 230, the gas can be heated in multiple stages and expanded in multiple stages after heating. This allows the gas to have greater pressure, thereby releasing more external work to generate electricity and improving power generation efficiency.

[0063] Specifically, in the embodiment shown in Figure 5, the heat exchange expansion unit 230 is provided with three units, namely the first heat exchange expansion unit 230, the second heat exchange expansion unit 230, and the third heat exchange expansion unit 230. The third inlet 811 of the first heat exchange expansion unit 230 is used to introduce low-temperature gas. After the gas undergoes heat exchange and expansion in the first heat exchange expansion unit 230, it enters the second heat exchange device 800 of the second heat exchange unit from the third inlet 811 of the second heat exchange unit. After further expansion and heat exchange in the second heat exchange unit, it enters the second heat exchange device 800 of the third heat exchange unit from the third inlet 811 of the third heat exchange unit, and finally exits from the second outlet 220 of the third heat exchange unit.

[0064] Taking the above embodiment as an example, when the expansion heat exchange unit is provided in other quantities, it is similar to the above embodiment, and will not be described again here.

[0065] Referring to Figure 1, in one embodiment, the combined heat and power system further includes a base 910, a gas storage device 920, and a gas transmission pipeline 930. The base 910 has a first side 911 and a second side 912. The first side 911 is for placement on the water surface. The first heat exchange device 300 and the second heat exchange device 800 are both located on the second side 912. The gas storage device 920 is located on the first side 911 and has a connected gas storage chamber and a vent 921. One end of the gas transmission pipeline 930 is connected to the vent 921, and the other end of the gas transmission pipeline 930 has a first gas transmission branch 931 and a second gas transmission branch 932. The first gas transmission branch 931 is connected to the first outlet 312, and the second gas transmission branch 932 is connected to the third inlet 811.

[0066] After being compressed by the gas compression device 100, the gas undergoes heat exchange in the first heat exchange device 300 and is discharged from the first outlet 312. The gas discharged from the first outlet 312 can enter the gas transmission pipeline 930 through the first gas transmission branch 931, and enter the gas storage chamber of the gas storage device 920 through the vent 921. When power generation is required, the gas in the gas storage chamber enters the gas transmission pipeline 930 through the vent 921, and enters the second heat exchange device 800 through the second gas transmission branch 932 and the third inlet 811. The heat exchanger 800 heats the gas and it enters the gas expansion device 200 from the third outlet 812 for subsequent power generation. By setting up a gas storage device 920, the pressurized gas can be collected and then used to generate electricity through the second heat exchanger 800 and the gas expansion device 200 when electricity is needed, thereby improving the flexibility of the combined heat and power system. In addition, one side of the base 910 is located on the water surface, and the gas storage device 920 located on the first side 911 is located below the water surface to further improve space utilization.

[0067] Please refer to Figure 1. In one embodiment, the gas storage device 920 is further provided with a liquid inlet 922 and a liquid outlet 923, both of which are connected to the gas storage chamber.

[0068] When there is no gas in the gas storage chamber, liquid enters the gas storage chamber through the liquid inlet 922 under atmospheric pressure. After being compressed by the gas compression device 100, the gas has a certain pressure. The pressurized gas enters the gas storage chamber through the gas supply pipe 930 and the vent 921. Since the density of the gas is less than that of the liquid in the gas storage chamber, as the gas is continuously filled into the gas storage chamber through the vent 921, the water in the gas storage chamber is gradually driven out by the gas through the liquid outlet 923. Since the surrounding liquid also has a certain pressure, the gas filling the gas storage chamber also has a certain pressure. When power generation is required, the gas with a certain pressure in the gas storage chamber enters the second heat exchange device 800 through the gas supply pipe 930. The second heat exchange device 800 heats the gas to further increase the gas pressure. Subsequently, the gas enters the gas expansion device 200 to generate electricity. This setup has low implementation cost and good energy storage effect.

[0069] Furthermore, the electricity required for the operation of the gas compression device 100 comes from the offshore wind power unit. When the city's electricity demand is low, the electricity generated by the offshore wind power unit drives the gas compression device 100 to operate, converting the electrical energy into the internal energy of the gas and storing it in the gas storage device 920. When the city's electricity demand is high, the offshore wind power unit is directly connected to the city's power grid. At the same time, the high-pressure gas in the gas storage device 920 is released and drives the gas expansion device 200 to generate electricity, so as to ensure the stability of the city's power supply.

[0070] As a supplement, since offshore wind power is intermittent and unstable, resulting in intermittent and unstable power supply in some areas of coastal cities, by setting up a gas storage device 920, the gas in the gas storage chamber can be used to generate electricity when the offshore wind power supply is tight, thereby preventing the occurrence of intermittent and unstable power supply.

[0071] Further, please refer to Figure 1. The gas storage device 920 includes a gas storage tank, which is horizontally placed below the water surface and is cylindrical. It has the characteristics of good pressure resistance and low cost. The liquid inlet 922 and the liquid outlet 923 are respectively located at the lower part of both ends of the gas storage tank.

[0072] Furthermore, the gas storage tank is placed 500 meters underwater to ensure the pressure of the gas inside.

[0073] As a supplementary example, during off-peak electricity demand, ambient temperature and pressure air is pressurized by three gas compression devices 100, raising its interstage temperature to 180°C. After being cooled by the first heat exchanger 300, the air temperature becomes 55°C before entering the next stage gas compression device 100, while the water temperature rises to 165°C. The 165°C hot water is stored in the heat storage device 500, and air at 55°C and 5.0MPa pressure is injected into the gas storage device 920, thus storing electrical energy. During peak electricity demand, the gas storage device 920 releases high-pressure air into the gas expansion device 200 to generate electricity. The air before entering the gas expansion device 200 is heated to 150°C by the second heat exchanger 800 before entering the gas expansion device 200 to generate electricity. Due to the heating of the air, the temperature of the heat exchange medium decreases from 165°C to 55°C. During the non-heating season, the hot water in the heat storage device 500 is only used to heat the inlet air of the gas expansion device 200. The hot water from the multiple secondary heat exchange devices 800 enters the waste heat recovery device 700 at a temperature of 55°C. After heat extraction, the water temperature drops to 35°C and returns to the cold storage device 600. During the heating season, heating is prioritized, and electricity is determined by heat demand. The hot water in the heat storage device 500 passes through the high-temperature heating device 400, the medium-temperature heating device 400, and the low-temperature heating device 400. The heating device 400 extracts heat for heating, and the cooled water returns to the cold storage device 600.

[0074] Please refer to Figure 2. In one embodiment, the first gas supply branch 931 is provided with a first valve 933, which is used to control the opening and closing of the first gas supply branch 931.

[0075] As an embodiment that can be implemented simultaneously with the above embodiments, the second gas supply branch 932 is provided with a second valve 934, which is used to control the opening and closing of the second gas supply branch 932.

[0076] The first valve 933 and the second valve 934 can control the opening and closing of the first gas supply branch 931 and the second gas supply branch 932, respectively, to control the gas flow path. When it is necessary to introduce the compressed gas into the gas storage device 920, the first valve 933 is opened and the second valve 934 is closed. When it is necessary to discharge the gas in the gas storage device 920 to the second heat exchange device 800, the first valve 933 is closed and the second valve 934 is opened. This setting is convenient to operate and has low implementation cost.

[0077] Please refer to Figure 8. In one embodiment, the heating device 400 includes a heat exchange pipe section 410 and a heating pipe section 420. One end of the heat exchange pipe section 410 is connected to the heat outlet 520, and the other end of the heat exchange pipe section 410 is connected to the cold inlet 610. The heating pipe section 420 can exchange heat with the heat exchange pipe section 410.

[0078] The heat medium is discharged from the heat outlet 520 to the heat exchange tube section 410. The heat medium in the heat exchange tube section 410 exchanges heat with the heating tube section 420 to transfer the heat of the heat medium to the heating tube section 420, thereby achieving heating. After the heat exchange, the heat medium is discharged from the heat exchange tube section 410 and enters the cold storage chamber of the cold storage device 600 from the cold inlet 610. This configuration has low implementation cost and high heat exchange efficiency.

[0079] Further, please refer to Figure 7. The heat exchange pipe section 410 is axially spaced from the heating pipe section 420. When the heat medium flows through the heat exchange pipe section 410, it exchanges heat with the heating medium in the heating pipe section 420 to transfer the heat of the heat medium to the heating medium, thereby achieving heating.

[0080] Optionally, the extension shape of the heat exchange pipe section 410 and the heating pipe section 420 can be straight or curved, and the heat exchange pipe section 410 and the heating pipe section 420 can also be coiled around each other to improve heat exchange efficiency.

[0081] Please refer to Figure 4. In one embodiment, the heating device 400 is provided with at least two, and the heat exchange pipe section 410 of the preceding heating device 400 is connected to the heat exchange pipe section 410 of the following heating device 400.

[0082] This configuration allows for multi-stage heat exchange of the heat medium, enabling more efficient heat transfer to the heating pipe section 420, improving heat exchange efficiency, and ensuring heating performance.

[0083] Specifically, in the embodiment shown in Figure 4, the heating device 400 is provided with three devices, namely a high-temperature heating device 400, a medium-temperature heating device 400, and a low-temperature heating device 400. One end of the heat exchange tube section 410 of the high-temperature heating device 400 is connected to the heat outlet 520, the other end of the heat exchange tube section 410 of the high-temperature heating device 400 is connected to one end of the heat exchange tube section 410 of the medium-temperature heating device 400, the other end of the heat exchange tube section 410 of the medium-temperature heating device 400 is connected to one end of the heat exchange tube section 410 of the low-temperature heating device 400, and the other end of the heat exchange tube section 410 of the low-temperature heating device 400 is connected to the cold inlet 610. In this way, it can be ensured that the heating device 400 absorbs the heat of the heat medium more fully, thus ensuring heating efficiency.

[0084] As a further example, the 165°C hot water in the heat storage device 500 enters the high-temperature heating device 400 to produce 95°C heating water, the 120°C hot water enters the medium-temperature heating device 400 to produce 80°C heating water, the 75°C hot water enters the low-temperature heating device 400 to produce 50°C heating water, and finally, the hot water temperature drops to 35°C and returns to the cold storage device 600.

[0085] In addition, the devices in the above embodiments can be connected to each other through different pipelines. Please refer to Figure 1 for the pipeline connection method. Those skilled in the art will understand that other connection methods can also be used to connect the devices, and no specific limitation is made here.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An integrated electricity and heat production system, characterized in that, The system comprises: a gas compression device having a first gas inlet and a first gas outlet in communication; a gas expansion device for electrically connecting with an electricity storage device, the gas expansion device having a second gas inlet and a second gas outlet in communication, the second gas outlet being used for discharging gas; a first heat exchange device having a first inlet and a first outlet in communication, the first inlet being in communication with the first gas outlet, and the first outlet being in communication with the second gas inlet; and a heating device capable of exchanging heat with the first heat exchange device.

2. The cogeneration system of claim 1, wherein, The system further comprises a heat storage device and a cold storage device, the heat storage device being used for storing a heat medium, the cold storage device being used for storing a cold medium, the first heat exchange device comprising a first refrigeration module and a first heating module, the first refrigeration module having the first inlet and the first outlet in communication, the first heating module having a second inlet and a second outlet in communication, the first refrigeration module being capable of exchanging heat with the first heating module, the second inlet and the heating device being in communication with the cold storage device, and the second outlet and the heating device being in communication with the heat storage device.

3. The cogeneration system of claim 2, wherein, The heat storage device has a heat storage cavity, a heat inlet and a heat outlet in communication, the cold storage device has a cold storage cavity, a cold inlet and a cold outlet in communication, the heat storage cavity being used for storing the heat medium, and the cold storage cavity being used for storing the cold medium, the cold outlet being in communication with the second inlet, the second outlet being in communication with the heat inlet, the heat outlet being in communication with the heating device, and the heating device being in communication with the cold inlet.

4. The cogeneration system of claim 3, wherein, The system further comprises a second heat exchange device having a third inlet and a third outlet in communication, the third inlet being in communication with the first outlet, and the third outlet being in communication with the second gas inlet, the second heat exchange device being in communication with the heat storage cavity and capable of exchanging heat with the heat medium.

5. The cogeneration system of claim 4, wherein, The second heat exchange device comprises a second heating module and a second refrigeration module, the second heating module having the third inlet and the third outlet in communication, the second refrigeration module having a fourth inlet and a fourth outlet in communication, the second heating module being capable of exchanging heat with the second refrigeration module, the fourth inlet being in communication with the heat outlet, and the fourth outlet being in communication with the cold inlet.

6. The cogeneration system of claim 4, wherein, The gas compression device and the first heat exchange device are each provided with at least two and are arranged one by one in correspondence, the gas compression device and the first heat exchange device are arranged alternately, each adjacent gas compression device and first heat exchange device form a compression heat exchange unit, the first outlet of a previous compression heat exchange unit is in communication with the first gas inlet of a subsequent compression heat exchange unit; or / and, The second heat exchange device and the gas expansion device are provided in at least two and one-to-one correspondence, the second heat exchange device and the gas expansion device are alternately arranged, each adjacent second heat exchange device and gas expansion device form a heat exchange expansion unit, the second gas outlet of the previous heat exchange expansion unit is communicated with the third inlet of the next heat exchange expansion unit.

7. The cogeneration system of claim 4, wherein, The electric heat cogeneration system further comprises a base, a gas storage device and a gas pipeline, the base has a first side and a second side, the first side is used to be arranged on the water surface, the first heat exchange device and the second heat exchange device are arranged on the second side, the gas storage device is arranged on the first side and is provided with a communicated gas storage cavity and a gas inlet, one end of the gas pipeline is communicated with the gas inlet, the other end of the gas pipeline is provided with a first gas branch and a second gas branch, the first gas branch is communicated with the first outlet, and the second gas branch is communicated with the third inlet.

8. The cogeneration system of claim 7, wherein, The gas storage device is further provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are communicated with the gas storage cavity.

9. The cogeneration system of claim 3, wherein, The heating device comprises a heat exchange pipe section and a heating pipe section, one end of the heat exchange pipe section is communicated with the heat outlet, the other end of the heat exchange pipe section is communicated with the cold inlet, and the heating pipe section can exchange heat with the heat exchange pipe section.

10. The cogeneration system of claim 9, wherein, The heating device is provided with at least two, and the heat exchange pipe section of the previous heating device is communicated with the heat exchange pipe section of the next heating device.

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