Thermoelectric cooperative industrial energy system

Abstract

The invention belongs to the technical field of renewable energy source crossing, and particularly relates to a thermoelectric cooperative industrial energy system which comprises a distributed photovoltaic system, a high-temperature heat pump, a high-temperature heat storage tank, a low-temperature heat storage tank, a controller, a production heat electricity utilization terminal and a heating heat utilization terminal. The output end of the distributed photovoltaic system is connected with the production heat power utilization tail end and the high-temperature heat pump, and the distributed photovoltaic system is used for generating electric energy to supply power to the production heat power utilization tail end and the high-temperature heat pump in the power generation peak period. The controller is electrically connected with the distributed photovoltaic system, the high-temperature heat pump, the low-temperature heat storage tank, the high-temperature heat storage tank, the electric tail end for production heat and the electric tail end for heat supply. According to the system, efficient storage and flexible peak-valley adjustment of power production and power consumption are realized; according to the design, bidirectional power generation is conducted from the production source and the supply end of energy, the comprehensive utilization rate of a photovoltaic power generation and heat pump heat supply system is increased, practicability is high, and stable operation and efficient utilization of an electric power system are improved.

Description

Technical Field

[0001] The present invention belongs to the cross-technical field of renewable energy, and in particular relates to a heat-electricity coordinated industrial energy system. Background Art

[0002] Photovoltaic power generation and heat pump technology are both clean and renewable energy development and utilization technologies, and are currently widely used in civil, industrial, and agricultural applications. The main sign of technological progress in their applications is to perform energy storage and peak-valley regulation based on the characteristics of different energy sources and peak-valley periods, continuously optimize the energy system operation control strategy, and improve the effective utilization rate of renewable energy. Energy storage mechanism and peak-valley regulation are important factors affecting the effective utilization rate of photovoltaic systems, and currently the low-cost storage of renewable energy electricity is a difficult point. Existing energy storage technologies mainly cover multiple fields such as electrical energy storage technology, mechanical energy storage technology, and thermal energy storage technology.

[0003] The electricity produced by the photovoltaic power generation system has obvious peak-valley periodic characteristics. This periodic distribution pattern does not match the hourly distribution of the load at the end of electricity consumption. Specifically, the peak period of electricity production is not consistent with the peak period of electricity consumption, which causes a time mismatch between the electricity production and supply ends. This incoordination affects the stable operation and efficient utilization of the power system. Summary of the invention

[0004] The purpose of the present invention is to provide a heat-electric coordinated industrial energy system to solve the problem that the peak and valley cycles of photovoltaic power generation do not match the power load, resulting in a time mismatch between power supply and demand, affecting the stable operation and efficient utilization of the system.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A thermoelectric coordinated industrial energy system comprises a distributed photovoltaic system, a high-temperature heat pump, a high-temperature heat storage tank, a low-temperature heat storage tank, a controller, a heat-production electricity terminal, and a heat-supply heat terminal; the output end of the distributed photovoltaic system is respectively connected to the heat-production electricity terminal and the high-temperature heat pump, and is used to generate electric energy to power the heat-production electricity terminal and the high-temperature heat pump during the peak period of power generation, the input end of the high-temperature heat storage tank is connected to the high-temperature heat pump, the output end of the high-temperature heat storage tank is connected to the heat-production electricity terminal, the output end of the heat-supply heat terminal is connected to the input end of the low-temperature heat storage tank, and the output end of the low-temperature heat storage tank is respectively connected to the input end of the high-temperature heat pump and the input end of the heat-supply heat terminal; the controller is electrically connected to the distributed photovoltaic system, the high-temperature heat pump, the low-temperature heat storage tank, the high-temperature heat storage tank, the heat-production electricity terminal, and the heat-supply heat terminal.

[0006] Furthermore, the heating temperature range of the high temperature heat pump is 85~160℃.

[0007] Furthermore, the heat storage medium in the high-temperature heat storage tank is water or molten salt, and the heat storage medium in the low-temperature heat storage tank is water.

[0008] The beneficial effects of the present invention are: The present invention realizes efficient storage and flexible peak-valley regulation of electricity production and consumption by connecting high-temperature heat storage tanks, low-temperature heat storage tanks, distributed photovoltaic systems and high-temperature heat pumps in series and in parallel. This design works from both the energy production source and the supply end, improves the comprehensive utilization rate of photovoltaic power generation and heat pump heating systems, has strong practicality, and improves the stable operation and efficient utilization of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a principle flow chart of a thermoelectric coordinated industrial energy system based on photovoltaics, heat pumps and heat storage according to the present invention.

[0010] In the figure: 1. Distributed photovoltaic system; 2. High-temperature heat pump; 3. High-temperature heat storage tank; 4. Low-temperature heat storage tank; 5. Controller; 6. Production heat and electricity terminal; 7. Heating heat terminal. DETAILED DESCRIPTION

[0011] The following examples are used to further illustrate the present invention, but should not be construed as limiting the present invention. Without departing from the spirit and substance of the present invention, modifications or substitutions made to the present invention all belong to the scope of the present invention.

[0012] See also Figure 1, a heat-electricity coordinated industrial energy system, comprising a distributed photovoltaic system 1, a high-temperature heat pump 2, a high-temperature heat storage tank 3, a low-temperature heat storage tank 4, a controller 5, a production heat and electricity terminal 6, and a heating heat terminal 7; the output end of the distributed photovoltaic system 1 is respectively connected to the production heat and electricity terminal 6 and the high-temperature heat pump 2, the input end of the high-temperature heat storage tank 3 is connected to the high-temperature heat pump 2, the output end of the high-temperature heat storage tank 3 is connected to the production heat and electricity terminal 6, the output end of the heating heat terminal 7 is connected to the input end of the low-temperature heat storage tank 4, and the output end of the low-temperature heat storage tank 4 is respectively connected to the input end of the high-temperature heat pump 2 and the input end of the heating heat terminal 7. During the peak period of power generation, the electric energy produced by the distributed photovoltaic system 1 not only supplies the electricity demand of the production heat and electricity terminal 6, but the excess electricity drives the high-temperature heat pump 2 to produce high-temperature hot water or steam, which is stored in the high-temperature heat storage tank 3; during the high-temperature period of electricity consumption, the heat demand of the production heat and electricity terminal 6 is supplied, and the production process generates The low-temperature waste heat is stored in the low-temperature heat storage tank 4, part of which is used as the low-temperature heat source of the high-temperature heat pump 2, and part of which is used to supply the low-temperature heat demand of the heating heat terminal 7; the controller 5 is electrically connected to the distributed photovoltaic system 1, the high-temperature heat pump 2, the low-temperature heat storage tank 4, the high-temperature heat storage tank 3, the production heat and electricity terminal 6, and the heating heat terminal 7; the controller 5 controls the distribution of the electricity produced by the distributed photovoltaic system 1 and the heat produced by the high-temperature heat pump 2 to the low-temperature heat storage tank 4, the high-temperature heat storage tank 3, the production heat and electricity terminal 6, and the heating heat terminal 7 according to the operating status of the distributed photovoltaic system 1 and the electricity demand and heat load change distribution of the production heat and electricity terminal 6 at different time points; through the series and parallel connection of the high-temperature heat storage tank 3, the low-temperature heat storage tank 4 and the distributed photovoltaic system 1 and the high-temperature heat pump 2, the storage and peak-valley regulation of renewable energy electricity and heat are realized, and the effective utilization rate of the photovoltaic system 1 and the high-temperature heat pump 2 is improved from both the production and supply ends of energy.

[0013] The heating temperature range of the high temperature heat pump 2 is 85~160℃.

[0014] The heat storage medium in the high-temperature heat storage tank 3 is water (steam) or molten salt according to the heat storage temperature and production process parameters, and the heat storage medium in the low-temperature heat storage tank 4 is water.

[0015] Among them, the high-temperature heat pump 2 energy storage technology that combines medium and high temperature heat needs has significantly improved the energy storage efficiency compared to the pure electric heating system, up to 70%, and can generate additional cold energy; the energy storage system using high-temperature heat pump 2 technology can improve the efficiency of renewable power storage while balancing the terminal electricity and heat time-sharing needs, thereby improving the overall efficiency of the energy system from both the production and supply ends.

[0016] In summary, the present invention realizes the storage and peak-valley regulation of renewable energy electricity and heat through the series and parallel connection of the high-temperature heat storage tank 3, the low-temperature heat storage tank 4, the distributed photovoltaic system 1, and the high-temperature heat pump 2, thereby improving the effective utilization rate of the photovoltaic power generation and heat pump heating system from both the production and supply ends of energy. It has strong practicality and has broad prospects for industrialization in the field of industrial clean energy.

[0017] Although some specific technical solutions of the present invention have been described in detail through embodiments, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the specific embodiments described, or replace them in a similar manner, but they will not deviate from the direction of the present invention or exceed the scope defined by the attached claims. Those skilled in the art should understand that any modification, equivalent substitution, improvement, etc. made to the above implementation modes according to the technical essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat-electricity coordinated industrial energy system, characterized in that: The invention comprises a distributed photovoltaic system (1), a high-temperature heat pump (2), a high-temperature heat storage tank (3), a low-temperature heat storage tank (4), a controller (5), a heat-production electricity terminal (6), and a heating heat terminal (7); the output end of the distributed photovoltaic system (1) is respectively connected to the heat-production electricity terminal (6) and the high-temperature heat pump (2); during the peak power generation period, the distributed photovoltaic system (1) is used to generate electric energy to supply power to the heat-production electricity terminal (6) and the high-temperature heat pump (2); the input end of the high-temperature heat storage tank (3) is connected to the high-temperature heat pump (2); The output end of the high-temperature heat storage tank (3) is connected to the production heat power terminal (6), the output end of the heating heat terminal (7) is connected to the input end of the low-temperature heat storage tank (4), and the output end of the low-temperature heat storage tank (4) is respectively connected to the input end of the high-temperature heat pump (2) and the input end of the heating heat terminal (7); the controller (5) is electrically connected to the distributed photovoltaic system (1), the high-temperature heat pump (2), the low-temperature heat storage tank (4), the high-temperature heat storage tank (3), the production heat power terminal (6) and the heating heat terminal (7).

2. A heat-power coordinated industrial energy system according to claim 1, characterized in that: The heating temperature range of the high-temperature heat pump (2) is 85-160°C.

3. A heat-power coordinated industrial energy system according to claim 2, characterized in that: The heat storage medium in the high-temperature heat storage tank (3) is water or molten salt, and the heat storage medium in the low-temperature heat storage tank (4) is water.

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