Multi-heat-source composite low-carbon steam system
By using a multi-heat-source composite low-carbon steam system, industrial steam is produced using solar energy, off-peak electricity, and air energy, solving the problem of replacing gas-fired steam boilers with clean energy in industrial parks and achieving efficient energy utilization and cost reduction.
Patent Information
- Application Number
- CN202520304698.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-25
AI Technical Summary
The industrial sector has a large carbon emission, and industrial heat consumption accounts for more than 60% of the country's total heat supply. How to effectively reduce the consumption of fossil fuels, and the limited open space in industrial parks that cannot accommodate a large number of solar collectors, urgently requires a clean energy steam system with lower operating costs to replace gas-fired steam boilers.
The system employs a multi-heat source composite low-carbon steam system, including a line focusing solar collector, a steam output device, a high-temperature heat source device, and a low-temperature heat source device. It utilizes solar energy, off-peak electricity, and air energy to produce industrial steam, and achieves the cascade utilization of various clean energy sources through components such as the line focusing solar collector, thermal oil steam generator, oil-gas separator, thermal oil circulation pump, and molten salt thermal storage module.
It has enabled the replacement of industrial heating with clean energy, reduced system operating costs, improved energy utilization efficiency, and reduced enterprise production costs.
Smart Images
Figure CN223826206U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heating technology, and in particular to a multi-heat source composite low-carbon steam system. Background Technology
[0002] The industrial sector has a large carbon emission, and industrial heat consumption accounts for more than 60% of the country's total heat consumption. How to effectively reduce fossil fuel consumption is the key to energy conservation and carbon reduction in the industrial sector. Achieving the goal of industrial carbon peaking is an inherent requirement for China's sustainable and high-quality development. In order to reduce carbon emissions in the industrial sector, it is urgent to promote clean, efficient and sustainable new energy alternatives.
[0003] Parabolic trough collectors use heat transfer oil as the circulating medium, with a maximum operating temperature of around 400℃, which is lower than the maximum operating temperature of 565℃ for binary molten salt heat storage. Due to the mismatch between the maximum operating temperature of the heat transfer oil and the maximum operating temperature of the molten salt, the temperature difference of the molten salt heat storage is small. To store the same amount of heat, the amount of molten salt and the volume of the heat storage tank need to be increased, which significantly increases the construction cost of energy storage.
[0004] Industrial parks mostly use natural gas steam boilers, but due to the high price of energy, there is an urgent need for a clean energy steam system with lower operating costs as a supplement. Industrial parks have limited open space and cannot install a large number of solar collectors. How to replace gas-fired steam boilers, reduce the consumption of petrochemical energy, and lower operating costs is an urgent problem to be solved. Utility Model Content
[0005] The purpose of this invention is to provide a multi-heat source composite low-carbon steam system to solve the above-mentioned technical problems.
[0006] To achieve the above objectives, this utility model provides a multi-heat source composite low-carbon steam system, including a line focusing heat collection device and a steam output device, wherein the steam output device is connected to the line focusing heat collection device, and further including a high-temperature heat source device and a low-temperature heat source device; the low-temperature heat source device is connected to the line focusing heat collection device and the high-temperature heat source device respectively through a thermal deaerator in the steam output device, and the high-temperature heat source device is connected to the steam output device.
[0007] Preferably, the linear focusing solar collector includes a linear focusing solar collector, a thermal oil vapor generator, an oil-gas separator, and a thermal oil circulation pump connected in series. The thermal oil circulation pump is connected to the linear focusing solar collector, the oil-gas separator is connected to a high-low level tank device, the high-low level tank device is connected to a nitrogen sealing device, and an electric three-way valve is installed between the linear focusing solar collector and the thermal oil vapor generator.
[0008] Preferably, the steam output device includes a steam distributor, the output end of which is connected to a desuperheater and pressure reducer. The steam distributor is connected to a condensate recovery unit, which is connected to a thermal deaerator. The thermal deaerator is connected to the steam distributor, and the thermal deaerator is connected to a hot water storage tank in the low-temperature heat source device via a water supply pump. The thermal deaerator is also connected to a thermal oil steam generator and a high-temperature heat source device via a feed water pump.
[0009] Preferably, the low-temperature heat source device includes a hot water storage tank connected to a water softening device, and the hot water storage tank is connected to a cascade high-temperature heat pump via a hot water circulation pump.
[0010] Preferably, the high-temperature heat source device is provided with at least one and several stacked molten salt heat storage modules, adjacent molten salt heat storage modules are connected by pipes, the bottom molten salt heat storage module is connected to an electric heater through a molten salt pump, a steam pipe is provided inside the molten salt heat storage module, the outlet of the steam pipe is connected to a steam distribution cylinder, and the inlet of the steam pipe is connected to a water supply pump.
[0011] Preferably, the upper side of the molten salt thermal storage module is provided with at least one positioning groove, and the lower side of the molten salt thermal storage module is provided with at least one positioning block. The positioning block is trapezoidal and is used for docking and positioning when adjacent molten salt thermal storage modules are hoisted.
[0012] Therefore, the multi-heat-source composite low-carbon steam system described above has the following beneficial effects: by setting up a linear focusing heat collection device, a high-temperature heat source device, and a low-temperature heat source device, it fully utilizes three clean energy sources—solar energy, off-peak electricity, and air energy—to produce industrial steam, achieving multi-heat-source composite energy cascade utilization. The coupled use of multiple clean and energy-saving technologies can effectively reduce system operating costs. This multi-energy complementary steam energy-saving system not only achieves clean energy substitution for industrial heat but also significantly reduces the production and operating costs of enterprises.
[0013] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of a multi-heat source composite low-carbon steam system according to the present invention;
[0015] Figure 2 This is a schematic diagram of the high and low level tank equipment of this utility model;
[0016] Figure 3 This is a schematic diagram of the cascade high-temperature heat pump of this utility model;
[0017] Figure 4 This is a schematic diagram of the molten salt thermal storage module of this utility model.
[0018] Figure Labels
[0019] 1. Linear focusing solar collector; 101. Linear focusing solar collector; 102. Electric three-way valve; 103. Thermal oil circulating pump; 104. Oil-gas separator; 105. High and low level tank equipment; 1051. Base; 1052. Oil injection pump; 1053. Low level tank; 1054. Support; 1055. Pipe assembly; 1056. High level tank; 1057. Magnetic level gauge; 106. Nitrogen sealing device; 107. Thermal oil steam generator; 2. High temperature heat source device; 201. Molten salt thermal storage module; 2011. Positioning tank; 2012. Positioning block; 202. Molten salt pump; 203. Electric heater 204. Steam pipe; 3. Low-temperature heat source device; 301. Hot water storage tank; 302. Hot water circulation pump; 303. Cascade high-temperature heat pump; 3031. Low-temperature side compressor; 3032. High-temperature side compressor; 3033. Evaporator; 3034. First condenser; 3035. Second condenser; 3036. Low-temperature side expansion valve; 3037. High-temperature side expansion valve; 304. Softening water device; 4. Steam output device; 401. Make-up water pump; 402. Thermal deaerator; 403. Feed water pump; 404. Steam distributor; 405. Desuperheater and pressure reducer; 406. Condensate recovery unit. Detailed Implementation
[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0021] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0022] like Figure 1As shown, a multi-heat source composite low-carbon steam system includes a linear focusing heat collector 1 and a steam output device 4, with the steam output device 4 connected to the linear focusing heat collector 1. It also includes a high-temperature heat source device 2 and a low-temperature heat source device 3; the low-temperature heat source device 3 is connected to both the linear focusing heat collector 1 and the high-temperature heat source device 2 via a thermal deaerator 402 in the steam output device 4, and the high-temperature heat source device 2 is connected to the steam output device 4.
[0023] The linear focusing solar collector 1 includes a linear focusing solar collector 101, a thermal oil vapor generator 107, an oil-gas separator 104, and a thermal oil circulation pump 103 connected in series. The thermal oil circulation pump 103 is connected to the linear focusing solar collector 101. The oil-gas separator 104 is used to remove low-boiling-point substances and air generated during system operation through a high-low level tank device 105, ensuring stable system operation. The oil-gas separator 104 is connected to the high-low level tank device 105, such as... Figure 2 As shown, the high and low level tank equipment 105 is connected to a nitrogen sealing device 106, and an electric three-way valve 102 is installed between the linear focusing collector 101 and the heat transfer oil vapor generator 107. The high and low level tank equipment 105 includes a base 1051, an oil injection pump 1052, a low level tank, a support 1054, a pipe assembly 1055, a high level tank 1056, and a magnetic level gauge 1057. The main function of the high level tank 1056 is to store the volume of heat transfer oil that expands due to temperature rise, preventing damage to the pipes and valves in the system due to thermal expansion and pressure rise. It also replenishes the system when oil is insufficient. The low level tank allows for emergency discharge of heat transfer oil in the system during system maintenance or in the event of an accident. The nitrogen sealing device 106 uses nitrogen to seal the high and low level tank equipment 105, which can prevent the heat transfer oil in the high and low level tank equipment 105 from direct contact with air, thus avoiding oxidation of the heat transfer oil and extending its service life.
[0024] The steam output device 4 includes a steam distributor 404, the output end of which is connected to a desuperheater and pressure reducer 405. The steam distributor 404 is also connected to a condensate recovery unit 406, which is connected to a thermal deaerator 402. The thermal deaerator 402 is connected to the steam distributor 404. The thermal deaerator 402 is connected to the hot water storage tank 301 in the low-temperature heat source device 3 via a water supply pump 401. The thermal deaerator 402 is also connected to the thermal oil steam generator 107 and the high-temperature heat source device 2 via a feed water pump 403. The steam distributor 404 is connected to the main steam supply pipeline, which is equipped with a desuperheater and pressure reducer. The steam from the steam distributor 404 is temperature- and pressure-regulated before being transported outwards to meet production needs. The condensate recovery unit 406 is connected to the main condensate pipeline, where the cooled steam is converted into condensate and returned to the condensate recovery unit 406 for recycling.
[0025] The low-temperature heat source device 3 includes a hot water storage tank 301 connected to a water softening device 304. The hot water storage tank 301 is connected to a cascade high-temperature heat pump 303 via a hot water circulation pump 302, and the cascade high-temperature heat pump 303 is used as the heat source. Figure 3 As shown, the low-temperature stage heat pump working fluid absorbs heat from the low-temperature heat source in the evaporator 3033 and then enters the low-temperature side compressor 3031. After being pressurized, it enters the first condenser 3034, where it releases heat and becomes a liquid working fluid. After being throttled by the low-temperature side expansion valve 3036, it returns to the evaporator 3033 to start the next cycle. The high-temperature stage heat pump working fluid also follows the same reverse Carnot cycle. The primary system absorbs heat from the air and drives the compression-condensation cycle through the low-temperature side compressor 3031 to provide heat to the secondary system. The secondary system absorbs heat from the first condenser 3034 and drives the compression-condensation cycle through the high-temperature side compressor 3032. The second condenser 3035 provides 90°C high-temperature hot water to the low-temperature heat source device 3. After being throttled by the high-temperature side expansion valve 3037, the medium returns to the evaporator 3033 to start the next cycle. Through the cascaded two-stage reverse Carnot cycle, the coupling of electrical energy and air energy is achieved, improving energy utilization efficiency.
[0026] The high-temperature heat source device 2 is equipped with at least one and several stacked molten salt heat storage modules 201. Adjacent molten salt heat storage modules 201 are connected by pipes. The bottommost molten salt heat storage module 201 is connected to an electric heater 203 via a molten salt pump 202. A steam pipe 204 is installed inside the molten salt heat storage module 201. The outlet of the steam pipe 204 is connected to a steam distribution cylinder 404, and the inlet of the steam pipe 204 is connected to a feed water pump. During heat storage, the molten salt pump 202 delivers molten salt to the electric heater 203. The electric heater 203 preferentially utilizes off-peak electricity with lower energy prices. The heated high-temperature molten salt is injected into multiple molten salt heat storage modules 201. As the molten salt flows, it continuously releases heat and cools down. The heat storage work is completed when the temperature of the entire molten salt heat storage module 201 reaches the set temperature of 565°C. When steam is required to be generated by the high-temperature heat source device 2, water is delivered to the steam pipe 204 at the bottom of the high-temperature heat source device 2 by the water pump 403. The water continuously absorbs heat in the molten salt heat storage module 201 and turns into high-temperature steam, which is discharged from the top to complete the heat release work. Heat storage and heat release can be operated simultaneously or in separate time periods.
[0027] like Figure 4 As shown, at least one positioning groove 2011 is provided on the upper side of the molten salt thermal storage module 201, and at least one positioning block 2012 is provided on the lower side of the molten salt thermal storage module 201. The positioning block 2012 is trapezoidal and is used for docking and positioning when adjacent molten salt thermal storage modules 201 are hoisted.
[0028] The specific work process is as follows:
[0029] When solar energy is abundant, the line focusing collector 101 begins to track the sun. The heat transfer oil circulation pump 103 delivers low-temperature heat transfer oil to the mirror field of the line focusing collector 101. After being heated, the high-temperature heat transfer oil enters the heat transfer oil steam generator 107 to exchange heat with water and generate steam. The steam passes through the steam distribution cylinder 404 and the desuperheating and pressure reducing device 405 before being delivered to the main steam supply pipeline to meet the steam demand of the enterprise's production and complete the local consumption of solar thermal energy.
[0030] When solar energy is insufficient, high-temperature heat source device 2 is activated, generating high-temperature steam through heat exchange between high-temperature molten salt and water. During off-peak electricity hours, high-temperature heat source device 2 uses lower-cost off-peak electricity for heating, storing the heat in the high-temperature molten salt, thus realizing the utilization of off-peak electricity.
[0031] The cascade high-temperature heat pump 303 heats water to 90°C by using electrical energy and air energy coupling and stores it in the hot water storage tank 301 to provide hot water for subsequent steam generation, thereby improving the system efficiency.
[0032] This embodiment fully utilizes three clean energy sources—solar energy, off-peak electricity, and air source heat pumps—to produce industrial steam, achieving multi-source composite energy cascade utilization. The combined use of multiple clean and energy-saving technologies effectively reduces system operating costs. This multi-energy complementary steam energy-saving system not only achieves clean energy substitution for industrial heat but also significantly reduces the enterprise's production and operating costs.
[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.
Claims
1. A multi-heat source composite low-carbon steam system, comprising a linear focusing heat collection device and a steam output device, wherein the steam output device is connected to the linear focusing heat collection device, characterized in that: It also includes a high-temperature heat source device and a low-temperature heat source device; the low-temperature heat source device is connected to the line focusing heat collection device and the high-temperature heat source device respectively through the thermal deaerator in the steam output device, and the high-temperature heat source device is connected to the steam output device.
2. The multi-heat source composite low-carbon steam system according to claim 1, characterized in that: The linear focusing solar collector includes a linear focusing solar collector, a thermal oil vapor generator, an oil-gas separator, and a thermal oil circulation pump connected in series. The thermal oil circulation pump is connected to the linear focusing solar collector. The oil-gas separator is connected to a high-low level tank device, which is connected to a nitrogen sealing device. An electric three-way valve is installed between the linear focusing solar collector and the thermal oil vapor generator.
3. The multi-heat source composite low-carbon steam system according to claim 2, characterized in that: The steam output device includes a steam distributor, the output end of which is connected to a desuperheater and pressure reducer. The steam distributor is also connected to a condensate recovery unit, which is connected to a thermal deaerator. The thermal deaerator is connected to the steam distributor, and the thermal deaerator is connected to a hot water storage tank in the low-temperature heat source device via a water supply pump. The thermal deaerator is also connected to a thermal oil steam generator and a high-temperature heat source device via a feed water pump.
4. The multi-heat source composite low-carbon steam system according to claim 3, characterized in that: The low-temperature heat source device includes a hot water storage tank connected to a water softening device, and the hot water storage tank is connected to a cascade high-temperature heat pump via a hot water circulation pump.
5. The multi-heat source composite low-carbon steam system according to claim 4, characterized in that: The high-temperature heat source device is equipped with at least one and several stacked molten salt heat storage modules. Adjacent molten salt heat storage modules are connected by pipes. The bottom molten salt heat storage module is connected to an electric heater through a molten salt pump. A steam pipe is installed inside the molten salt heat storage module. The outlet of the steam pipe is connected to a steam distribution cylinder, and the inlet of the steam pipe is connected to a water supply pump.
6. The multi-heat source composite low-carbon steam system according to claim 5, characterized in that: The upper side of the molten salt thermal storage module is provided with at least one positioning groove, and the lower side of the molten salt thermal storage module is provided with at least one positioning block. The positioning block is trapezoidal and is used for docking and positioning when adjacent molten salt thermal storage modules are hoisted.