CN-122015297-A - Photovoltaic and photo-thermal integrated system and method

CN122015297ACN 122015297 ACN122015297 ACN 122015297ACN-122015297-A

Abstract

A photovoltaic and photo-thermal integrated system and a method belong to the technical field of solar comprehensive utilization, and the system comprises a PVT plate, a circulating pump, an energy-saving pressure reducing valve, a filter, a heat storage water tank and a plate heat exchanger, wherein an outlet end of the PVT plate is connected with an inlet end of a second plate heat exchanger, the second plate heat exchanger is connected with a second inlet end of the heat storage water tank, a second outlet end of the heat storage water tank is connected with the second circulating pump, the filter is connected with the filter through the second plate heat exchanger, a first end of the energy-saving pressure reducing valve is connected with an evaporator, the evaporator is connected with a liquid reservoir, the liquid reservoir is connected with the second inlet end of the heat storage water tank through the second plate heat exchanger, a second end of the energy-saving pressure reducing valve is connected with the first circulating pump through the first plate heat exchanger, and an outlet end of the PVT plate is connected with the first inlet end of the heat storage water tank. The application recycles waste heat energy and improves the comprehensive energy utilization rate.

Inventors

CHEN QIHAO
ZHANG XIAOTIAN
FANG WEIJIE
LI MENGYUAN
CHEN JIANDANG
WANG HONGBO
LI JIANKUN
WANG ZHAOPENG

Assignees

国能寿光发电有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260113

Claims (10)

1. A photovoltaic photo-thermal integrated system, the system comprising: The solar energy power generation system comprises a PVT plate, a circulating pump, an energy-saving pressure reducing valve, a filter, an evaporator, a heat storage water tank, a plate heat exchanger, a heat storage water tank and a heat storage water tank, wherein the PVT plate is used for carrying out photovoltaic power generation and photo-thermal conversion and outputting electric energy and heat energy; The outlet end of the PVT plate is connected with the inlet end of a second plate heat exchanger, the second plate heat exchanger is connected with the second inlet end of the heat storage water tank, the second outlet end of the heat storage water tank is connected with a second circulating pump, the second circulating pump is connected with a filter through the second plate heat exchanger, the filter is connected with an energy-saving pressure reducing valve, the first end of the energy-saving pressure reducing valve is connected with an evaporator, and the evaporator is connected with the second inlet end of the heat storage water tank through the second plate heat exchanger; the outlet end of the PVT plate is connected with the first inlet end of the heat storage water tank, and the first outlet end of the heat storage water tank is connected with the inlet end of the first circulating pump.
2. The photovoltaic and photothermal integrated system according to claim 1, wherein the PVT sheet is further connected to a dish-type concentrator, and the PVT sheet is disposed on a concentrating disc of the dish-type concentrator, and the dish-type concentrator is configured to concentrate sunlight.
3. The photovoltaic photo-thermal integration system of claim 1, wherein the PVT sheet further comprises: The photovoltaic cell comprises a photovoltaic cell layer and a heat conduction substrate of a working medium flow channel, wherein electric energy output by the photovoltaic cell layer is directly utilized or connected with a network after being converted by an inverter, and the heat conduction substrate is used for heating working medium.
4. The photovoltaic photo-thermal integrated system of claim 1 further comprising a working fluid flow channel through which the system is connected.
5. The photovoltaic photo-thermal integrated system of claim 1 further comprising a reservoir having an inlet end connected to the evaporator and an outlet end of the PVT sheet, the outlet end of the reservoir being connected to the inlet end of the second plate heat exchanger, the reservoir being configured to store a working fluid.
6. A photovoltaic photo-thermal integration method, characterized in that it is based on the system according to any one of claims 1-5, comprising the steps of: S1, collecting solar energy on a PVT plate, absorbing the solar energy by the PVT plate, and synchronously generating electric energy and heat energy, wherein the heat energy is used for heating an internal working medium; S2, the heated working medium flows into a second plate heat exchanger, and heat of the working medium is transferred to fluid in a heat storage water tank through the second plate heat exchanger, so that the temperature of the working medium is reduced; s3, the cooled working medium passes through a second circulating pump and a second plate heat exchanger, flows through a filter for purification treatment, and flows into the first plate heat exchanger through an energy-saving pressure reducing valve and flows back to the inlet end of the PVT plate through the first plate heat exchanger; s4, the evaporator extracts residual and extra heat from the working medium through evaporation of the refrigerant, and the heat is transferred to the second plate heat exchanger, so that the working medium is further cooled; S5, returning the cooled working medium to the inlet end of the PVT plate and reheating to form energy collection and lifting circulation.
7. The integrated photovoltaic and photothermal method according to claim 6, wherein in step S1, the heated internal working medium flows into the heat storage water tank through the first inlet end of the heat storage water tank, and flows out through the first outlet end of the heat storage water tank, and then flows to the PVT sheet by being driven by the first circulation pump.
8. The integrated photovoltaic and photothermal method according to claim 6, wherein in step S2, the fluid in the hot water storage tank is domestic water or heating water.
9. The photovoltaic and photo-thermal integrated method according to claim 6, wherein in step S3, the working medium after purification treatment through the filter is subjected to pressure regulation through an energy-saving pressure reducing valve before flowing into the evaporator; The second end of the energy-saving pressure reducing valve is communicated with the first plate heat exchanger, and part of working medium is led to flow to the first plate heat exchanger.
10. The photovoltaic/photothermal integrated method according to claim 6, wherein in step S4, the evaporator is further connected to a liquid reservoir, an inlet end of the liquid reservoir is connected to the evaporator and an outlet end of the PVT sheet, an outlet end of the liquid reservoir is connected to an inlet end of the second plate heat exchanger, and the liquid reservoir is used for storing a working medium.

Description

Photovoltaic and photo-thermal integrated system and method Technical Field The application belongs to the technical field of comprehensive utilization of solar energy, and particularly relates to a photovoltaic and photo-thermal integrated system and method. Background The solar energy condensation technology has wide application in the field of solar energy efficient utilization due to the advantages of high condensation ratio, high energy density, compact structure and the like, and two main flow application schemes are formed at present, but the problems of insufficient energy utilization and single function exist. The scheme is a mature application form in the field of solar energy condensation, namely sunlight is converged on a heat absorption head of the Stirling engine through a condensing device, medium in the heat absorption head is heated by utilizing light energy, and the engine is driven to operate and the generator is driven to output electric energy. However, the system only aims at electric energy output, and a large amount of high-temperature waste heat generated in the operation process of the Stirling engine is directly discharged into the environment through a special radiator, so that the system cannot be effectively recycled in any form. The system has extremely low comprehensive energy utilization efficiency, and causes the waste of concentrated solar energy resources, and the essence of the system is a single utilization mode of thermoelectric separation, rather than a cogeneration mode which combines electricity and heat output. The other type is a high-concentration photovoltaic system, the system is usually matched with a simple heat dissipation design, a high-efficiency multi-junction photovoltaic cell is distributed in a concentration focus area to realize photoelectric conversion, and an active cooling system (such as liquid cooling and air cooling) is provided to control the working temperature of the cell. However, the design objective of the cooling system is single, only the photovoltaic cell is maintained in a safe working area, the power generation efficiency is guaranteed, and the heat taken away from the surface of the cell by a cooling medium (such as cooling liquid) is regarded as waste heat. The heat is deliberately reduced in energy grade due to the limitation of heat dissipation design, and even if the heat is recovered by a simple device, the temperature is generally lower than 80 ℃, and medium-temperature heat energy with high application value cannot be produced, which is essentially heat dissipation for power generation. The existing solar concentrating system generally faces the problems of low comprehensive utilization efficiency, high-grade heat waste and single function, develops an integrated system with concentrating integration and step heat exchange functions, and becomes a key requirement for breaking through the bottleneck of the current technology. Disclosure of Invention The invention aims to solve the problems of low comprehensive efficiency, heat waste and single function of solar energy in the prior art of mutual cutting of electric energy and heat energy supply, and provides a photovoltaic and photo-thermal integrated system and method. In a first aspect, an embodiment of the present application provides a photovoltaic photo-thermal integrated system, the system comprising: The solar energy power generation system comprises a PVT plate, a circulating pump, an energy-saving pressure reducing valve, a filter, an evaporator, a heat storage water tank, a plate heat exchanger, a heat storage water tank and a heat storage water tank, wherein the PVT plate is used for carrying out photovoltaic power generation and photo-thermal conversion and outputting electric energy and heat energy; The outlet end of the PVT plate is connected with the inlet end of a second plate heat exchanger, the second plate heat exchanger is connected with the second inlet end of the heat storage water tank, the second outlet end of the heat storage water tank is connected with a second circulating pump, the second circulating pump is connected with a filter through the second plate heat exchanger, the filter is connected with an energy-saving pressure reducing valve, the first end of the energy-saving pressure reducing valve is connected with an evaporator, and the evaporator is connected with the second inlet end of the heat storage water tank through the second plate heat exchanger; the outlet end of the PVT plate is connected with the first inlet end of the heat storage water tank, and the first outlet end of the heat storage water tank is connected with the inlet end of the first circulating pump. Further, the PVT plate is also connected with a disc-type condenser, and the PVT plate is arranged on a focusing disc of the disc-type condenser, and the disc-type condenser is used for converging sunlight. Further, the PVT sheet further comprises: The photovoltaic cell comprises