A multi-energy complementary steam source replacement system and method for an industrial park

Abstract

The present invention discloses a multi-energy complementary steam source replacement system for an industrial park, including: a geothermal heat extraction system for geothermal heat extraction; a solar thermal system for solar thermal heat extraction and heating; a valley electric heating system for valley electric heat extraction and heating; a molten salt heat storage device, connecting the solar thermal system and the valley electric heating system, for receiving heat from the solar thermal system and the valley electric heating system. The present invention uses a water vapor compressor to increase the temperature and pressure of the low-temperature and low-pressure steam coming out of the flash evaporation body to meet the needs of steam users. The water vapor compressor uses a single-screw compressor. Compared with reciprocating compressors of the same type of parameters, it uses water as a lubricating medium. It has a simple structure, a compression ratio of up to 9, and a maximum water vapor temperature of 200°C.

Description

Technical Field

[0001] The present invention relates to the field of regional heating technology, and in particular to a multi-energy complementary steam source replacement system and method for an industrial park. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, the heat sources for centralized steam supply in industrial parks are mainly coal-fired boilers, natural gas boilers, biomass boilers, electric boilers, etc. However, the above-mentioned heat sources have different types of advantages and disadvantages. For example, coal-fired boilers have been gradually banned with the influence of environmental protection trends; gas boilers can only be used after natural gas pipelines are laid, and the current laying of natural gas management is mainly concentrated in economically developed areas. Many relatively backward areas have not yet laid natural gas pipelines. In addition, the cost of generating steam with gas boilers is relatively high, and "gas shortages" have occurred in many areas.

[0004] The fuel of biomass boilers is renewable green power and has a wide range of sources, mainly by-products of agricultural production such as crop straw, wood chips, and bark, which have a wide range of sources; however, the fuel requires a separate storage area. In essence, it just changes the fuel from coal to matter, so it takes up a lot of space. Moreover, burning biomass will still produce smoke and ash, which will not only pollute the atmosphere and land, but also adhere to the inner wall of the combustion chamber, causing the thermal efficiency of the equipment to continue to decrease. The biggest advantage of electric boilers is environmental protection, because they do not burn themselves and do not produce any polluting emissions, but they need to be equipped with a large capacity and are more expensive. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a multi-energy complementary steam source replacement system and method for industrial parks, which utilizes the mutual coupling of geothermal energy, solar thermal energy and low-valley molten salt heat storage to meet the steam needs of enterprises.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides an industrial park multi-energy complementary steam source replacement system, comprising:

[0008] Geothermal heating system, used for geothermal heating;

[0009] Solar thermal system, used for solar thermal heating;

[0010] The off-peak electric heating system is used for off-peak electric heating;

[0011] The molten salt heat storage device is connected to the solar thermal system and the off-peak electric heating system to receive heat from the solar thermal system and the off-peak electric heating system.

[0012] Furthermore, the geothermal heat extraction system includes a geothermal water extraction pump for extracting high-temperature geothermal water from the geothermal water extraction well.

[0013] Furthermore, the geothermal water return system also includes a geothermal recovery pump, a flash body liquid level regulating valve and a geothermal water return well;

[0014] The outlet end of the liquid level regulating valve is connected to the geothermal return water well, and the inlet end is connected to the geothermal return water pump;

[0015] Furthermore, it also includes a low-pressure steam flash evaporation system, which includes a flash evaporation body for flashing out low-pressure steam and generating saturated condensed water.

[0016] Furthermore, the low-pressure steam flash evaporation system also includes an electromagnetic heating device, a circulating flash evaporation atomizing nozzle, and a circulating flash evaporation riser, which are used for secondary heating and circulating flash evaporation of saturated condensed water.

[0017] Furthermore, the low-pressure steam flash evaporation system further includes a primary flash evaporation nozzle for performing a primary flash evaporation on the geothermal water;

[0018] Furthermore, the flash evaporation body also includes a steam-water separator for effectively separating water from the water vapor.

[0019] Furthermore, the geothermal return water pump is used to transport the saturated condensed water back to the flash evaporation body for secondary circulation flash evaporation.

[0020] Furthermore, the liquid level regulating valve is used to control the liquid level of the flash evaporation body;

[0021] Furthermore, the solar thermal system comprises a heat transfer oil circulation system and a plurality of trough-type solar absorber subsystems.

[0022] Further, the molten salt heat storage system comprises a molten salt device;

[0023] Furthermore, the valley electric heating system includes a high-voltage electrode heating device.

[0024] Furthermore, the desalted water heating system comprises a desalted water processing device, a desalted water delivery pump and a desalted water primary heat exchange device.

[0025] Furthermore, the trough solar absorber subsystem includes a trough collector, and the medium for heat exchange in the trough collector is heat transfer oil.

[0026] In a second aspect, the present invention provides a method for replacing a multi-energy complementary steam source in an industrial park, comprising:

[0027] Geothermal heating through geothermal heating system;

[0028] Solar thermal heating through solar thermal systems;

[0029] The off-peak electric heating system is used to provide heating through off-peak electricity;

[0030] The heat from the solar thermal system and the off-peak electric heating system is received through the molten salt heat storage device.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention uses a water vapor compressor to heat and pressurize the low-temperature and low-pressure steam coming out of the flash evaporation body to meet the needs of steam users. The water vapor compressor uses a single-screw compressor. Compared with the reciprocating compressor of the same type of parameters, it uses water as the lubricating medium. Its structure is simple, the compression ratio can reach 9, and the water vapor temperature can reach up to 200°C.

[0033] Advantages of additional aspects will be given in part in the description which follows, and in part will be obvious from the description which follows, or will be learned through practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] Figure 1 A schematic diagram of the structure provided for this embodiment;

[0036] Among them, 1. geothermal water well; 2. geothermal water pump; 3. valve 1; 4. geothermal return well; 5. liquid level regulating valve; 6. valve 2; 7. geothermal return pump; 8. primary heat exchange device; 9. desalted water delivery pump; 10. desalted water system; 11. electromagnetic heating device; 12. primary flash nozzle; 13. flash body; 14. steam-water separator; 15. steam compressor; 16. trough heater; 17. valley electric heating system; 18. molten salt heat storage device; 19. thermal oil circulation system; 20. circulating flash riser; 21. circulating flash atomizing nozzle, 22 steam users. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0040] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and should not be understood as limitations on the present invention.

[0041] In the present invention, terms such as "fixed connection", "connected", "connection" and the like should be understood in a broad sense, indicating that the connection may be fixed, integral or detachable; it may be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field may determine the specific meaning of the above terms in the present invention according to specific circumstances, and they shall not be construed as limiting the present invention.

[0042] Example 1

[0043] In a first aspect, the present invention provides an industrial park multi-energy complementary steam source replacement system, comprising:

[0044] Geothermal heating system, used for geothermal heating;

[0045] Solar thermal system, used for solar thermal heating;

[0046] The off-peak electric heating system is used for off-peak electric heating;

[0047] The molten salt heat storage device is connected to the solar thermal system and the off-peak electric heating system to receive heat from the solar thermal system and the off-peak electric heating system.

[0048] 47 The geothermal heat extraction system includes a geothermal water extraction pump for extracting high-temperature geothermal water from the geothermal water extraction well.

[0049] The geothermal water return system also includes a geothermal recovery pump, corresponding valves, a flash body liquid level regulating valve and a geothermal water return well, etc.;

[0050] The outlet end of the liquid level regulating valve is connected to the geothermal return water well, and the inlet end is connected to the geothermal return water pump;

[0051] It also includes a low-pressure steam flash system, which includes a flash body for flashing out low-pressure steam and generating saturated condensed water.

[0052] The low-pressure steam flash evaporation system also includes an electromagnetic heating device, a circulating flash evaporation atomizing nozzle, and a circulating flash evaporation riser, which are used for secondary heating and circulating flash evaporation of saturated condensed water.

[0053] The low-pressure steam flash evaporation system further includes a primary flash evaporation nozzle for performing a primary flash evaporation on the geothermal water;

[0054] The flash evaporation body also includes a steam-water separator for effectively separating water from the water vapor.

[0055] The geothermal return water pump is used to transport the saturated condensed water back to the flash evaporation body for secondary circulation flash evaporation.

[0056] The liquid level regulating valve is used to control the liquid level of the flash evaporation body;

[0057] The solar thermal system comprises a heat transfer oil circulation system and a plurality of trough-type solar absorber subsystems.

[0058] The molten salt heat storage system comprises a molten salt device;

[0059] The valley electric heating system includes a high voltage electrode heating device.

[0060] The desalted water heating system comprises a desalted water processing device, a desalted water delivery pump and a desalted water primary heat exchange device.

[0061] The trough solar absorber subsystem includes a trough collector, and the medium for heat exchange in the trough collector is heat transfer oil.

[0062] Specifically,

[0063] A geothermal water pump (2) is used to extract high-temperature geothermal water (100-130°C) from a geothermal water well (1), and transported to a flash evaporation body (13) through a pipeline. After being depressurized by a primary flash evaporation nozzle (12), low-pressure steam is flashed out and saturated condensed water is generated. A portion of the low-pressure saturated condensed water is transported by a geothermal return water pump (7) into the flash evaporation body (13) for secondary circulation flash evaporation. The low-pressure saturated condensed water passes through a circulating flash evaporation riser (20) and a circulating flash evaporation atomizing nozzle (21) in turn. The purpose of the secondary circulation flash evaporation is to increase the flash evaporation amount. A portion of the low-pressure saturated condensed water is used to adjust the liquid level of the flash evaporation body (13) through a liquid level regulating valve (5).

[0064] As another advantageous form of the present invention, when the heat extraction system fails or other factors occur, backfill is performed through valve 1 (3) so as not to affect the system.

[0065] When the local hot water temperature does not meet the quality requirements of the flash steam, an electromagnetic secondary heating device (11) is used for supplementary heating, and the temperature of the electromagnetic heating area reaches 150-200°C; the saturated condensed water from the circulating flash atomizing nozzle (21) is sprayed at a high speed to the area of ​​the electromagnetic heating flash body (13), and steam is immediately generated, thereby increasing the flash volume and steam temperature.

[0066] The heat sources of the molten salt heat storage device (18) are solar heat and off-peak electricity. The solar energy thermal system adopts a trough collector (16), and the medium for heat exchange with the trough collector (16) is heat transfer oil. The trough collector (16) heats the heat transfer oil in the heat transfer oil circulation system (19) to above 300°C. The high-temperature heat transfer oil exchanges heat with the molten salt heat storage device (18), thereby storing the heat of the solar energy in the molten salt heat storage device (18). Off-peak electricity serves as a heat supplement and peak-shaving system in the molten salt heat storage device (18). When the solar energy is insufficient or the time period is not suitable, in order to ensure that the heat in the molten salt heat storage device (18) meets the system process requirements, off-peak electricity is used for heat storage.

[0067] In order to realize the generation of steam, desalted water is used as a carrier. After ordinary medium water passes through the desalted water treatment device (10), it is heat-exchanged with saturated condensed water coming out of the flash evaporation body (13) in the desalted water primary heat exchange device (8) through the desalted water delivery pump (9), thereby increasing the temperature of the desalted water. After the desalted water coming out of the desalted water primary heat exchange device (8) is heated by the molten salt heat storage device (18), steam of a certain quality is produced, and then reaches the steam user (22) to meet the use requirements.

[0068] The low-temperature, low-pressure steam coming out of the flash evaporator body (13) has a relatively low quality and cannot fully meet the needs of users. As another effective utilization method of the present invention, a water vapor compressor (15) is used to increase the temperature and pressure of the low-temperature, low-pressure steam coming out of the flash evaporator body (13) to meet the needs of steam users (22).

[0069] Example 2.

[0070] In a second aspect, the present invention provides a method for replacing a multi-energy complementary steam source in an industrial park, comprising:

[0071] Geothermal heating through geothermal heating system;

[0072] Solar thermal heating through solar thermal systems;

[0073] The off-peak electric heating system is used to provide heating through off-peak electricity;

[0074] The heat from the solar thermal system and the off-peak electric heating system is received through the molten salt heat storage device.

[0075] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that, based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. An industrial park multi-energy complementary steam source replacement system, characterized in that: include: Geothermal heating system, used for geothermal heating; Solar thermal system, used for solar thermal heating; The off-peak electric heating system is used for off-peak electric heating; A molten salt heat storage device is connected to the solar thermal system and the valley electric heating system to receive heat from the solar thermal system and the valley electric heating system; Also included is a low-pressure steam flash system, the low-pressure steam flash system comprising a flash body, used to flash out low-pressure steam and produce saturated condensed water; The geothermal heat extraction system includes a geothermal water extraction pump for extracting high-temperature geothermal water from a geothermal water extraction well; Geothermal water return system, including geothermal water return pump, liquid level regulating valve and geothermal water return well; The outlet end of the liquid level regulating valve is connected to the geothermal return water well, and the inlet end is connected to the geothermal return water pump; The low-pressure steam flash evaporation system also includes an electromagnetic heating device, a circulating flash evaporation atomizing nozzle, and a circulating flash evaporation riser for secondary heating and circulating flash evaporation of saturated condensed water; The low-pressure steam flash evaporation system further includes a primary flash evaporation nozzle for performing a primary flash evaporation on the geothermal water; The flash evaporation body also includes a steam-water separator for effectively separating water from the water vapor; The geothermal return water pump is used to transport the saturated condensed water back to the flash evaporation body for secondary circulation flash evaporation; Liquid level regulating valve, used to control the liquid level of the flash evaporation body; The high-temperature geothermal water under the geothermal water well is extracted by a geothermal water pump and transported to the flash evaporator through a pipeline. After the pressure is reduced by the first-level flash evaporator nozzle, low-pressure steam is flashed and saturated condensed water is generated. A part of the low-pressure saturated condensed water is transported by the geothermal return water pump into the flash evaporator body for secondary circulation flash evaporation. The low-pressure saturated condensed water passes through the circulating flash evaporator riser and the circulating flash evaporator atomizing nozzle in turn. The purpose of the secondary circulation flash evaporation is to increase the flash evaporation volume; a part of the low-pressure saturated condensed water is used to adjust the liquid level of the flash evaporator body through the liquid level regulating valve; When the local hot water temperature does not meet the quality requirements of flash steam, an electromagnetic secondary heating device is used for supplementary heating; the saturated condensate from the circulating flash atomizing nozzle is sprayed at high speed to the flash body area using electromagnetic heating, and steam is immediately generated, thereby increasing the flash volume and steam temperature; The heat sources of the molten salt heat storage device are solar thermal energy and off-peak electricity. The solar thermal system uses a trough collector, and the medium for heat exchange in the trough collector is heat transfer oil. The trough collector heats the heat transfer oil in the heat transfer oil circulation system to above 300°C. This high-temperature heat transfer oil then exchanges heat with the molten salt heat storage device, thereby storing the heat of the solar energy in the molten salt heat storage device. Off-peak electricity is used as a heat supplement and peak-shaving system in the molten salt heat storage device. When the solar energy is insufficient or the time period is not suitable, in order to ensure that the heat in the molten salt heat storage device meets the system process requirements, off-peak electricity is used for heat storage. It also includes a desalted water heating system, including a desalted water treatment device, a desalted water delivery pump and a desalted water primary heat exchange device; After ordinary medium water passes through the desalted water treatment device, it is transferred through the desalted water delivery pump to the desalted water primary heat exchange device for heat exchange with the saturated condensed water from the flash evaporation body, thereby increasing the temperature of the desalted water. The desalted water from the desalted water primary heat exchange device is heated by the molten salt heat storage device to produce steam of a certain quality. A water vapor compressor is used to increase the temperature and pressure of the low-temperature and low-pressure steam coming out of the flash evaporator.

2. The industrial park multi-energy complementary steam source replacement system according to claim 1, characterized in that: The solar thermal system comprises a heat transfer oil circulation system and a plurality of trough-type solar absorber subsystems.

3. The multi-energy complementary steam source replacement system for an industrial park as claimed in claim 1, characterized in that: The valley electric heating system includes a high voltage electrode heating device.

4. The industrial park multi-energy complementary steam source replacement system according to claim 2, characterized in that: The trough solar absorber subsystem includes a trough collector, and the medium for heat exchange in the trough collector is heat transfer oil.

5. A method for replacing a multi-energy complementary steam source in an industrial park, using a multi-energy complementary steam source replacement system for an industrial park as described in any one of claims 1 to 4, characterized in that: include: Geothermal heating through geothermal heating system; Solar thermal heating through solar thermal systems; The off-peak electric heating system is used to provide heating through off-peak electricity; Receive heat from the solar thermal system and off-peak electric heating system through a molten salt thermal storage device; The geothermal heat extraction system comprises a geothermal water extraction pump, which is used to extract high-temperature geothermal water from the geothermal water extraction well.

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