Combined heat and power system

Abstract

The application relates to an electric-heat cogeneration system, which comprises a gas compression device, a gas expansion device, a first heat exchange device and a heating device, the gas compression device is provided with a first gas inlet and a first gas outlet in communication; the gas expansion device is electrically connected with an electricity storage device, the gas expansion device is provided with a second gas inlet and a second gas outlet in communication, and the second gas outlet is used for discharging gas; the first heat exchange device is provided with a first inlet and a first outlet in communication, the first inlet is communicated with the first gas outlet, and the first outlet is communicated with the second gas inlet; and the heating device can exchange heat with the first heat exchange device. Compared with the prior art, the electric-heat cogeneration system can realize heating and power generation simultaneously, can solve the power consumption and heating demand of residents without respectively building power stations and heating stations, has small land occupation and low construction cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, and particularly relates to an electricity and heat cogeneration system. BACKGROUND

[0002] In winter, the coastal cities in northern China have not only electricity demand but also heating demand. Usually, power stations and heating stations are built to meet the electricity and heating demand of residents. However, this way has a large occupation area, resulting in high construction cost. SUMMARY

[0003] Therefore, it is necessary to provide an electricity and heat cogeneration system in view of the problem of high construction cost caused by the large occupation area of power stations and heating stations.

[0004] The technical scheme is as follows:

[0005] One embodiment provides an electricity and heat cogeneration system, comprising:

[0006] a gas compression device having a first gas inlet and a first gas outlet in communication;

[0007] a gas expansion device configured to be electrically connected to 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 configured to discharge gas;

[0008] 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

[0009] a heating device configured to exchange heat with the first heat exchange device.

[0010] In the above electricity and heat cogeneration system, the gas enters the gas compression device through the first gas inlet, the gas compression device compresses the gas to obtain high-pressure gas, and the high-pressure gas has a certain compression heat during the compression process of the gas compression device. The high-pressure gas with the compression heat is discharged from the first gas outlet and enters the first heat exchange device through the first inlet, so that the compression heat of the high-pressure gas is transferred to the first heat exchange device. The first heat exchange device exchanges heat with the heating device to transfer the compression heat to the heating device and use the compression heat for heating. The high-pressure gas after the heat transfer in the first heat exchange device is discharged from the first outlet and enters the gas expansion device through the second gas 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 the electricity storage device. Compared with the prior art, the above electricity and heat cogeneration system can realize heating and power generation at the same time, and can solve the electricity and heating demand of residents without building power stations and heating stations separately, thereby reducing the occupation area and the construction cost.

[0011] In one of the embodiments, the cogeneration system further comprises a heat storage device and a cold storage device, the heat storage device is configured to store the heat medium, the cold storage device is configured to store the cold medium, the first heat exchange device comprises a first refrigeration module and a first heating module, the first refrigeration module is configured to be in communication with the first inlet and the first outlet, the first heating module is configured to be in communication with a second inlet and a second outlet, the first refrigeration module is configured to exchange heat with the first heating module, the second inlet and the heating device are in communication with the cold storage device, and the second outlet and the heating device are in communication with the heat storage device.

[0012] In one of the embodiments, the heat storage device is configured to be in communication with a heat storage cavity, a heat inlet and a heat outlet, the cold storage device is configured to be in communication with a cold storage cavity, a cold inlet and a cold outlet, the heat storage cavity is configured to store the heat medium, the cold storage cavity is configured to store the cold medium, the cold outlet is in communication with the second inlet, the second outlet is in communication with the heat inlet, the heat outlet is in communication with the heating device, and the heating device is in communication with the cold inlet.

[0013] In one of the embodiments, the cogeneration system further comprises a second heat exchange device, the second heat exchange device is configured to be in communication with a third inlet and a third outlet, the third inlet is in communication with the first outlet, and the third outlet is in communication with the second air inlet, the second heat exchange device is in communication with the heat storage cavity and is configured to exchange heat with the heat medium.

[0014] In one of the embodiments, the second heat exchange device comprises a second heating module and a second refrigeration module, the second heating module is configured to be in communication with the third inlet and the third outlet, the second refrigeration module is configured to be in communication with a fourth inlet and a fourth outlet, the second heating module is configured to exchange heat with the second refrigeration module, the fourth inlet is in communication with the heat outlet, and the fourth outlet is in communication with the cold inlet.

[0015] In one of the embodiments, the gas compression device and the first heat exchange device are each configured to be provided with at least two and one-to-one correspondence, the gas compression device and the first heat exchange device are alternately arranged, each adjacent gas compression device and first heat exchange device are configured to form a compression heat exchange unit, the first outlet of the previous compression heat exchange unit is in communication with the first air inlet of the next compression heat exchange unit; or / and,

[0016] 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, and each adjacent second heat exchange device and gas expansion device form a heat exchange expansion unit, and the second gas outlet of the previous heat exchange expansion unit is communicated with the third inlet of the subsequent heat exchange expansion unit.

[0017] In one of the embodiments, the cogeneration system further comprises a base, a gas storage device and a gas delivery 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 gas storage cavity and a gas outlet in communication, one end of the gas delivery pipeline is communicated with the gas outlet, the other end of the gas delivery pipeline is provided with a first gas delivery branch and a second gas delivery branch, the first gas delivery branch is communicated with the first outlet, and the second gas delivery branch is communicated with the third inlet.

[0018] In one of the embodiments, 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.

[0019] In one of the embodiments, 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.

[0020] In one of the embodiments, the heating device is provided in at least two, and the heat exchange pipe section of the previous heating device is communicated with the heat exchange pipe section of the subsequent heating device. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 It is a schematic diagram of the overall structure of the cogeneration system in an embodiment of the present application.

[0023] Figure 2 It is a schematic diagram of the structure of one part of the cogeneration system in an embodiment of the present application.

[0024] Figure 3 It is a schematic diagram of the structure of the compression heat exchange unit in an embodiment of the present application.

[0025] Figure 4 FIG. 7 is a schematic diagram of a structure of another part of the cogeneration system according to an embodiment of the present application.

[0026] Figure 5 FIG. 8 is a schematic diagram of a structure of the heat exchange expansion unit according to an embodiment of the present application.

[0027] Figure 6 FIG. 9 is a schematic diagram of a structure of the first heat exchange device according to an embodiment of the present application.

[0028] Figure 7 FIG. 10 is a schematic diagram of a structure of the second heat exchange device according to an embodiment of the present application.

[0029] Figure 8 FIG. 11 is a schematic diagram of a structure of the heating device according to an embodiment of the present application.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 100, gas compression device; 110, first gas inlet; 120, first gas outlet; 130, compression heat exchange unit; 200, gas expansion device; 210, second gas inlet; 220, second gas 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, air inlet; 922, liquid inlet; 923, liquid outlet; 930, gas pipeline; 931, first gas sub-pipeline; 932, second gas sub-pipeline; 933, first valve; 934, second valve. DETAILED DESCRIPTION

[0032] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is to be understood that the present application is not limited to the specific embodiments described below.

[0033] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0034] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0035] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0036] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] It is to be noted that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, it is to be understood that when a layer is referred to as being "connected", "coupled", or "adjacent" to another element, it can be directly connected, coupled, or adjacent to the other element, or intervening elements can also be present. As used herein, the term "vertical", "horizontal", "up", "down", "left", "right", and similar terms are used for explanation only and not to limit the embodiments of the present application.

[0038] Referring to Figures 1 to 7 One embodiment of the present application provides an electricity and heat cogeneration system, comprising 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 gas inlet 110 and a first gas outlet 120 in communication. The gas expansion device 200 is electrically connected to an electricity storage device. The gas expansion device 200 has a second gas inlet 210 and a second gas outlet 220 in communication. The second gas outlet 220 is used to discharge gas. The first heat exchange device 300 has a first inlet 311 and a first outlet 312 in communication. The first inlet 311 is in communication with the first gas outlet 120. The first outlet 312 is in communication with the second gas inlet 210. The heating device 400 can exchange heat with the first heat exchange device 300.

[0039] In the electricity and heat cogeneration system, the gas enters the gas compression device 100 through the first gas inlet 110. The gas compression device 100 compresses the gas to obtain high-pressure gas. The gas compression device 100 brings certain compression heat to the high-pressure gas during the compression process. The high-pressure gas with compression heat is discharged from the first gas outlet 120 and enters the first heat exchange device 300 through the first inlet 311, so that the compression heat of the high-pressure gas is transferred to the first heat exchange device 300. The first heat exchange device 300 exchanges heat with the heating device 400, so that the compression heat is transferred to the heating device 400 and used for heating. The high-pressure gas after heat transfer in the first heat exchange device 300 is discharged from the first outlet 312 and enters the gas expansion device 200 through the second gas 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 electricity storage device. Compared with the conventional technology, the electricity and heat cogeneration system can realize heating and power generation at the same time, and can solve the electricity and heating demand of residents without building power stations and heating stations respectively, thereby reducing the land occupation and the construction cost.

[0040] As an explanation, the gas in the above-mentioned embodiment can be air, the first gas inlet 110 of the gas expansion device 200 is in communication with the outside, so as to guide the air outside into the gas compression device 100 through the first gas 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 as to transfer the compression heat of the high-pressure air to the heating device 400 through the first heat exchange device 300 and perform subsequent heating; it can be understood that the gas in the above-mentioned embodiment can also be other kinds of gas other than air, which is not limited here.

[0041] Further, the high-pressure gas enters the gas expansion device 200 through the second gas inlet 210, the high-pressure gas is expanded and decompressed in the gas expansion device 200 to output external work, and the gas expansion device 200 converts the external work into electric energy and transmits it to the electric storage device to realize power generation.

[0042] As an explanation, the electric storage device in the above-mentioned embodiment can be an energy storage device, or a device directly electrically connected to the power grid, the gas expansion device 200 transmits the generated electric energy to the electric storage device, and then to the power grid for use; in other embodiments, the gas expansion device 200 can also be directly electrically connected to the power grid, so as to directly transmit the electric energy to the power grid for use.

[0043] Please refer to Figures 1 to 7 In one embodiment, the combined electric-thermal power generation system further comprises a heat storage device 500 and a cold storage device 600, the heat storage device 500 is used for storing a heat medium, the cold storage device 600 is used for storing a cold medium, the first heat exchange device 300 comprises 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 in communication, the first heating module 320 has a second inlet 321 and a second outlet 322 in communication, the first refrigeration module 310 can exchange heat with the first heating module 320, the second inlet 321 and the heating device 400 are in communication with the cold storage device 600, and the second outlet 322 and the heating device 400 are in communication with 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 from 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 compression heat to the cold medium, and the cold medium is converted into 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, and the hot medium transfers its heat to the heating device 400, at this time, the hot medium is converted into cold medium, and the cold medium is discharged from the heating device 400 and enters the cold storage device 600, which is recycled to realize heating; in this way, not only effective heating can be realized, but also the heat exchange medium can be reused, energy is saved, and the environment is more friendly.

[0045] Please refer to Figure 2 In one embodiment, the heat storage device 500 is provided with a communicating heat storage cavity, a heat inlet 510 and a heat outlet 520, the cold storage device 600 is provided with a communicating cold storage cavity, a cold inlet 610 and a cold outlet 620, the heat storage cavity is used for storing hot medium, the cold storage cavity is used for storing cold medium, the cold outlet 620 is communicated with the second inlet 321, the second outlet 322 is communicated with the heat inlet 510, the heat outlet 520 is communicated with the heating device 400, and the heating device 400 is communicated with the cold inlet 610.

[0046] The cold medium in the cold storage cavity 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 from 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 compression heat to the cold medium, and the cold medium is converted into hot medium, the hot medium is discharged from the second outlet 322 and enters the heat storage cavity through the heat inlet 510, the hot medium in the heat storage cavity is discharged from the heat outlet 520 and enters the heating device 400, and the hot medium transfers its heat to the heating device 400, at this time, the hot medium is converted into cold medium, and the cold medium is discharged from the heating device 400 and enters the cold storage cavity through the cold inlet 610, which is recycled to realize heating; in this way, not only effective heating can be realized, but also the heat exchange medium can be reused, energy is saved, and the environment is more friendly.

[0047] Optionally, the hot medium and the cold medium in the above-mentioned embodiments can be liquid heat exchange medium such as water and oil, or gas heat exchange medium, which is not limited here; preferably, water is used as the heat exchange medium, which is low in cost and reliable in heat exchange effect.

[0048] As an explanation, the heat inlet 510 in the above embodiment represents a passage for entering the hot medium, and the heat outlet 520 represents a passage for discharging the hot medium; the cold outlet 620 represents a passage for discharging the cold medium, and the cold inlet 610 represents a passage for entering the cold medium.

[0049] Please refer to Figure 1 In one embodiment, the electric-thermal cogeneration system further comprises a waste heat recovery device 700, the fourth outlet 822 is in communication with the waste heat recovery device 700, and the waste heat recovery device 700 is in communication with the cold storage cavity; the waste heat recovery device 700 can recover the waste heat of the heat exchange medium after heat exchange, thereby improving the heat production efficiency of the electric-thermal cogeneration system.

[0050] Please refer to Figures 1 to 7 In one embodiment, the electric-thermal cogeneration system further comprises a second heat exchange device 800, the second heat exchange device 800 is provided with a third inlet 811 and a third outlet 812 in communication, the third inlet 811 is in communication with the first outlet 312, the third outlet 812 is in communication with the second gas inlet 210, and the second heat exchange device 800 is in communication with the heat storage cavity and can exchange heat with the hot medium.

[0051] The high-pressure gas with compression heat compressed by the gas compression device 100 is cooled after passing through the first refrigeration module 310, and the cooled gas is discharged from the first outlet 312 and enters the second heat exchange device 800 from the third inlet 811; the heat storage device 500 can transfer the heat of the heat exchange medium in the heat storage cavity to the second heat exchange device 800 to heat the gas in the second heat exchange device 800, and the heated gas has a larger pressure, and the gas with a larger pressure is discharged from the third outlet 812 and enters the gas expansion device 200 from the second gas inlet 210; the gas with a larger pressure expands and depressurizes in the gas expansion device 200 to output more external work, so that the gas expansion device 200 can generate more electric energy and improve the power generation efficiency.

[0052] Further, the heat storage device 500 can exchange heat with the second heat exchange device 800 to transfer the heat of the hot medium in the heat storage cavity to the gas in the second heat exchange device 800, and the gas in the second heat exchange device 800 is heated to have a larger pressure, and the gas with a larger pressure expands and depressurizes in the gas expansion device 200 to output more external work, thereby generating more electric energy and improving the power generation efficiency.

[0053] Please refer to Figure 7In one embodiment, the second heat exchange device 800 comprises a second heating module 810 and a second refrigeration module 820, the second heating module 810 has a third inlet 811 and a third outlet 812 in communication, the second refrigeration module 820 has a fourth inlet 821 and a fourth outlet 822 in communication, the second heating module 810 and the second refrigeration module 820 can exchange heat, the fourth inlet 821 is in communication with the heat outlet 520, and the fourth outlet 822 is in communication with the cold inlet 610.

[0054] The heat medium in the heat storage cavity 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 from 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 transmits its heat to the low-temperature gas, the pressure of the low-temperature gas increases after being heated, the gas with increased pressure is discharged from the third outlet 812 and enters the gas expansion device 200, and the gas with increased pressure expands and reduces pressure in the gas expansion device 200, so as to output more external work, so that the gas expansion device 200 can generate more electric energy and improve the power generation efficiency.

[0055] In addition, when in the non-heating season (such as late spring season, 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; when in the heating season (such as late autumn season, winter, etc.), part of the heat medium in the heat storage device 500 enters the second heat exchange device 800 to exchange heat and heat the gas, so as to improve the power generation efficiency of the gas expansion device 200, and the other part of the heat medium exchanges heat with the heating device 400, in this process, the heat exchange between the heat medium and the heating device 400 should be given priority to, to ensure the heating effect and then ensure the "heat determines electricity".

[0056] Please refer to Figure 3 In one embodiment, the gas compression device 100 and the first heat exchange device 300 are each provided with at least two and are one-to-one correspondingly arranged, the gas compression device 100 and the first heat exchange device 300 are one-to-one alternately arranged, and each adjacent gas compression device 100 and the first heat exchange device 300 are matched to form a compression heat exchange unit 130, and the first outlet 312 of the previous compression heat exchange unit 130 is in communication with the first gas 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 be heated in multiple stages, so that the gas not only has a greater pressure to release more external work for power generation, but also absorbs more compression heat of the gas for heating, further improving the efficiency of power generation and heating.

[0058] Specifically Figure 3 In the embodiment shown, the compression heat exchange unit 130 is provided with three and is respectively a first compression heat exchange unit 130, a second compression heat exchange unit 130 and a third compression heat exchange unit 130, the first gas inlet 110 of the first compression heat exchange unit 130 is used to pass in the gas, the gas is compressed and heat exchanged by the first compression heat exchange unit 130, and then enters the gas compression device 100 of the second compression heat exchange unit 130 from the first gas inlet 110 of the second compression heat exchange unit 130, and then is compressed and heat exchanged by the second compression heat exchange unit 130, and then enters the gas compression device 100 of the third heat exchange unit from the first gas inlet 110 of the third compression heat exchange unit 130, and finally is discharged from the first outlet 312 of the third compression heat exchange unit 130.

[0059] Further, 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 with other quantities, similar to the above embodiment, details are not repeated here.

[0061] As an embodiment that can be implemented simultaneously with the above embodiment, the second heat exchange device 800 and the gas expansion device 200 are each provided with at least two and are one-to-one correspondingly arranged, the second heat exchange device 800 and the gas expansion device 200 are alternately arranged, and each adjacent second heat exchange device 800 and gas expansion device 200 are matched to form a heat exchange expansion unit 230, and the second gas outlet 220 of the previous heat exchange expansion unit 230 is in communication with 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 the heated gas can be expanded in multiple stages, so that the gas has a greater pressure to release more external work for power generation, improving the efficiency of power generation.

[0063] Specifically Figure 5In the shown embodiment, the heat exchange expansion unit 230 is provided with three and is respectively a first heat exchange expansion unit 230, a second heat exchange expansion unit 230 and a third heat exchange expansion unit 230, the third inlet 811 of the first heat exchange expansion unit 230 is used to pass in low-temperature gas, the gas is subjected to heat exchange expansion through the first heat exchange expansion unit 230, enters the second heat exchange device 800 of the second expansion heat exchange unit from the third inlet 811 of the second expansion heat exchange unit, is subjected to expansion heat exchange through the second expansion heat exchange unit, enters the second heat exchange device 800 of the third expansion heat exchange unit from the third inlet 811 of the third expansion heat exchange unit, and is finally discharged from the second gas outlet 220 of the third expansion heat exchange unit.

[0064] Taking the above embodiment as an example, when the expansion heat exchange unit is provided with other quantities, similar to the above embodiment, details are not described herein.

[0065] Please refer to Figure 1 In one embodiment, the combined electric heating system further comprises a base 910, a gas storage device 920 and a gas conveying pipeline 930, the base 910 has a first side 911 and a second side 912, the first side 911 is used to be arranged on the water surface, the first heat exchange device 300 and the second heat exchange device 800 are arranged on the second side 912, the gas storage device 920 is arranged on the first side 911 and is provided with a communicating gas storage cavity and a gas vent 921, one end of the gas conveying pipeline 930 communicates with the gas vent 921, the other end of the gas conveying pipeline 930 is provided with a first gas conveying branch 931 and a second gas conveying branch 932, the first gas conveying branch 931 communicates with the first outlet 312, and the second gas conveying branch 932 communicates with the third inlet 811.

[0066] After the gas is compressed through the gas compression device 100, the gas is subjected to heat exchange through 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 conveying pipeline 930 through the first gas conveying branch 931 and enter the gas storage cavity of the gas storage device 920 through the gas vent 921, when power generation is needed, the gas in the gas storage cavity enters the gas conveying pipeline 930 through the gas vent 921 and enters the second heat exchange device 800 through the second gas conveying branch 932 and the third inlet 811, the second heat exchange device 800 heats the gas and the gas enters the gas expansion device 200 from the third outlet 812 for subsequent power generation; by arranging the gas storage device 920, the pressurized gas can be collected, and when power is needed, the gas is subjected to power generation through the second heat exchange device 800 and the gas expansion device 200, thereby improving the use flexibility of the combined electric heating system, in addition, one side of the base 910 is arranged on the water surface, and the gas storage device 920 arranged on the first side 911 is arranged below the water surface, so as to further improve the space utilization rate.

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

[0068] When there is no gas in the gas storage cavity, liquid enters the gas storage cavity through the liquid inlet 922 under the action of atmospheric pressure. After being compressed by the gas compression device 100, the gas has a certain pressure. The gas with pressure enters the gas storage cavity through the gas pipeline 930 and the vent 921. Since the density of the gas is less than that of the liquid in the gas storage cavity, the water in the gas storage cavity is gradually driven out by the gas from the liquid outlet 923 as the gas continues to fill the gas storage cavity from the vent 921. Since the surrounding liquid also has a certain pressure, the gas filled into the gas storage cavity also has a certain pressure. When power generation is needed, the gas with a certain pressure in the gas storage cavity enters the second heat exchange device 800 through the gas pipeline 930. The second heat exchange device 800 heats the gas to further increase the pressure of the gas. Subsequently, the gas enters the gas expansion device 200 to do work and generate electricity. Such a configuration has low implementation cost and good energy storage effect.

[0069] Further, the electricity required for the operation of the gas compression device 100 comes from the offshore wind power device. When the demand for city electricity is low, the electricity generated by the offshore wind power device drives the gas compression device 100 to operate, so as to convert the electricity into the internal energy of the gas and store it in the gas storage device 920. When the demand for city electricity is high, the offshore wind power device is directly connected to the city power grid, and at the same time, the high-pressure gas in the gas storage device 920 is released and drives the gas expansion device 200 to do work and generate electricity, so as to ensure the stability of city power supply.

[0070] Additionally, due to the intermittent instability of offshore wind power, the power supply in some areas of coastal cities is also intermittent and unstable. By providing the gas storage device 920, the gas in the gas storage cavity can be used to generate electricity when the supply of offshore wind power 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 under the water surface and has the characteristics of good pressure bearing and low cost. The liquid inlet 922 and the liquid outlet 923 are respectively arranged at the lower parts of the two ends of the gas storage tank.

[0072] Further, the gas storage tank is placed 500 meters deep under the water to ensure the pressure of the gas in the gas storage tank.

[0073] As a supplement, during the low electricity consumption period, the normal temperature and pressure air is pressurized by the three gas compression devices 100, the temperature between stages is increased to 180℃, the air temperature is changed to 55℃ after the air is cooled by the first heat exchange device 300, and the water temperature is increased to 165℃. The 165℃ hot water is stored in the heat storage device 500, the 55℃ air with a pressure of 5.0MPa is filled into the gas storage device 920, and the electricity storage is realized; during the high electricity consumption period, the high pressure air in the gas storage device 920 is released into the gas expansion device 200 to generate electricity. The air before entering the gas expansion device 200 is heated to 150℃ by the second heat exchange device 800, and then enters the gas expansion device 200 to generate electricity. Due to the heating of the air, the temperature of the heat exchange medium is reduced from 165℃ to 55℃. In 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, and the hot water from the multiple second heat exchange devices 800 enters the waste heat recovery device 700, and the water temperature is reduced to 35℃ after the heat is extracted, and then the water is returned to the cold storage device 600. In the heating season, the heating is given priority to, and the hot water in the heat storage device 500 is heated by the high-temperature heating device 400, the medium-temperature heating device 400 and the low-temperature heating device 400 respectively, and the heating device 400 obtains heat for heating, and the cooled water is returned 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, and the first valve 933 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-mentioned embodiment, the second gas supply branch 932 is provided with a second valve 934, and the second valve 934 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, so as to control the flow path of the gas. When it is needed to guide the compressed gas into the gas storage device 920, the first valve 933 is opened and the second valve 934 is closed, and when it is needed 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; in this way, the operation is convenient and the implementation cost is low.

[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 in communication with the heat outlet 520, the other end of the heat exchange pipe section 410 is in communication with the cold inlet 610, and 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 pipe section 410, and the heat medium in the heat exchange pipe section 410 exchanges heat with the heating pipe section 420 to transfer the heat of the heat medium to the heating pipe section 420, thereby achieving heating. The heat exchange medium after heat exchange is discharged from the heat exchange pipe section 410 and enters the cold storage cavity of the cold storage device 600 from the cold inlet 610. In this way, the implementation cost is low and the heat exchange efficiency is high.

[0079] Further, referring to Figure 7 , the axial direction of the heat exchange pipe section 410 is arranged in a spaced manner with the axial direction of the heating pipe section 420. When the heat medium flows through the heat exchange pipe section 410, the heat medium 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 a straight line or a curve. The heat exchange pipe section 410 and the heating pipe section 420 can also be arranged in a coiled manner to improve the heat exchange efficiency.

[0081] Please refer to Figure 4 In an embodiment, the heating device 400 is provided with at least two, and the heat exchange pipe section 410 of the previous heating device 400 is in communication with the heat exchange pipe section 410 of the subsequent heating device 400.

[0082] In this way, the heat medium can be subjected to multi-stage heat exchange, so that the heat of the heat medium is more fully delivered to the heating pipe section 420, the heat exchange efficiency is improved, and the heating effect is ensured.

[0083] Specifically Figure 4 In the embodiment shown in the figure, the heating device 400 is provided with three and is 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 pipe section 410 of the high-temperature heating device 400 is in communication with the heat outlet 520, the other end of the heat exchange pipe section 410 of the high-temperature heating device 400 is in communication with one end of the heat exchange pipe section 410 of the medium-temperature heating device 400, the other end of the heat exchange pipe section 410 of the medium-temperature heating device 400 is in communication with one end of the heat exchange pipe section 410 of the low-temperature heating device 400, and the other end of the heat exchange pipe section 410 of the low-temperature heating device 400 is in communication with the cold inlet 610. In this way, the heat of the heat medium can be more fully absorbed by the heating device 400, and the heating efficiency is ensured.

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

[0085] In addition, each device in the above embodiments can be connected through different pipelines. The pipeline connection mode can be understood with reference to Figure 1 Those skilled in the art can understand that other connection modes can be used to connect each device, which is not limited here.

[0086] The technical features of the above embodiments can be combined in any manner. To make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as the scope of the description.

[0087] The above embodiments only express several implementation manners of the application, and the description is specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for those skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A combined power and heat system, characterized in that, include: A gas compression device having a first air inlet and a first air outlet connected in communication; 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. A first heat exchange device, comprising a first inlet and a first outlet, the first inlet being connected to a first air outlet, the first outlet being connected to a second air inlet; and A heating device, which is capable of exchanging heat with the first heat exchange device; 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. 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. 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 can exchange heat with the heat exchange pipe section. The heating device is provided in at least two parts, and the heat exchange pipe section of the preceding heating device is connected to the heat exchange pipe section of the following heating device.

2. The cogeneration system according to claim 1, characterized in that, The combined heat and power system further includes a second heat exchange device, which has a third inlet and a third outlet connected together. 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 can exchange heat with the heat medium.

3. The cogeneration system according to claim 2, characterized in that, The second heat exchange device includes a second heating module and a second cooling module. The second heating module has a third inlet and a third outlet connected together, and the second cooling module has a fourth inlet and a fourth outlet connected together. 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.

4. The cogeneration system according to claim 2, characterized in that, The gas compression device and the first heat exchange device are each provided in at least two and are arranged in a one-to-one correspondence. The gas compression device and the first heat exchange device are arranged alternately. Each adjacent gas compression device and the first heat exchange device are combined to form a compression heat exchange unit. The first outlet of the preceding compression heat exchange unit is connected to the first air inlet of the following compression heat exchange unit; or / and, 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.

5. The cogeneration system according to claim 2, characterized in that, 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.

6. The cogeneration system according to claim 5, characterized in that, The first gas supply branch is equipped with a first valve, which is used to control the opening and closing of the first gas supply branch.

7. The cogeneration system according to claim 5, characterized in that, The second gas supply branch is equipped with a second valve, which is used to control the opening and closing of the second gas supply branch.

8. The cogeneration system according to claim 5, characterized in that, The gas storage device is also provided with a liquid inlet and a liquid outlet, both of which are connected to the gas storage chamber.

9. The cogeneration system according to claim 8, characterized in that, The gas storage device includes a gas storage tank, which is horizontally placed below the water surface and is cylindrical. The liquid inlet and the liquid outlet are respectively located at the lower parts of both ends of the gas storage tank.

10. The cogeneration system according to claim 1, characterized in that, The heat exchange pipe section is spaced apart from the heating pipe section along its axial direction.

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