CN108194202A - A kind of condensation photovoltaic/light thermal-coupling natural gas thermoelectric cold triple supply integral system - Google Patents

Abstract

A concentrating photovoltaic/solar-thermal coupling natural gas heat, electricity and cooling triple supply integrated system, mainly including concentrating photovoltaic solar-thermal components (1), natural gas power supply system (2), heat pump (3), refrigeration equipment (4), user terminal (5). The hot water generated by the concentrated photovoltaic photothermal module (1) is used for heating and domestic water after being heated by a heat pump, and drives a lithium bromide absorption refrigerator for cooling. The natural gas power supply system (2) drives the gas turbine and drives the generator to generate electricity. The flue gas at the tail drives the refrigeration equipment (4) and heats the living space. The invention not only effectively utilizes the waste heat generated in the process of photovoltaic power generation and natural gas power generation, to supply heating, cooling and domestic water for user terminals. At the same time, the temperature of the photovoltaic cell is reduced, the efficiency of the photovoltaic cell is improved, the service life of the photovoltaic cell is increased, and the cascade utilization of energy is realized. The system can be arranged on the top floor of a building, and can supply power, heating, cooling and domestic water to the building, and is suitable for large-scale promotion.

Description

A Concentrating Photovoltaic/Photothermal Coupled Natural Gas Thermal Power Cooling Triple Supply Integrated System

technical field

The invention discloses a concentrated photovoltaic/photothermal coupling natural gas thermoelectric cooling triple supply integrated system.

Background technique

As a clean energy, solar energy can greatly alleviate the current fossil energy crisis by improving its utilization efficiency. At present, the solar trigeneration system has broad application prospects. Many scholars have carried out a lot of research in this field. Wan Qing et al. designed a solar combined power supply system, pointing out that the main technical approach of solar combined cooling, heating and power is to use solar energy as a heat source, and drive refrigeration units to cool through photoelectric conversion, or Through photothermal power conversion, power generation, heating and cooling are realized simultaneously in a power cycle. Wang et al. designed a solar cogeneration system combining Rankine cycle and jet refrigeration cycle, and studied the influence of hour angle and slope angle on the performance of flat-plate solar collector system. Finally, using genetic algorithm, Optimized with the goal of maximum exergy efficiency. Taking an existing building in Spain as the research object, Medrano et al. proved that after the introduction of solar energy, the cogeneration system can save electricity and gas costs, and pointed out that the absorption chiller plays a vital role in energy saving.

In real life, the CPC-PVT combined heat and power system has a wide range of practicability and economy. Chaoqing Feng et al. designed a CPC-PV/T/D system for solar green building roofs, which can generate both electricity and heat. It can also provide heat for the room. Experiments show that the transmittance of this type of roof is only 30% when the light is strongest at noon, and can reach more than 70% when the external light is weak. It has a good function of adjusting indoor light, and at the same time the highest The electric efficiency is 7%, and the maximum air heating power is 55W, which has good practical value. Xu Yu et al. designed a dielectric compound parabolic concentrator (dCPC) for green buildings, and verified through simulation that dCPC has the function of adjusting indoor light and has a certain power generation capacity.

Natural gas is a clean and environmentally friendly high-quality energy source, which contains almost no sulfur, dust and other harmful substances. When burned, it produces less carbon dioxide than other fossil fuels, resulting in a lower greenhouse effect, which can fundamentally improve environmental quality. The use of natural gas for power supply can greatly reduce the generation of carbon dioxide, and at the same time, it can be better integrated with the building. Therefore, there are a lot of researches on natural gas combined supply system at home and abroad.

Kang Shushuo proposed a distributed energy system in which a natural gas-based combined cooling, heating and power system (NG-CCHP) and a ground source heat pump (GSHP) are coupled. And taking a typical case as the object, the influence characteristics of the system performance and coupling key operating parameters on the performance of the integrated energy supply system are studied. Based on the second law of thermodynamics, Zhang Qi et al. conducted an economic analysis of the natural gas combined heat, power and cooling system, and obtained the impact of natural gas prices on the combined system. Combining the domestic and foreign tri-generation development situation and Beijing's latest development policy, Wang Yutong studied the tri-generation system suitable for the development of Beijing, designed a Beijing-style tri-generation technology solution, and took the office building project of Beijing Gas Group as an example. For example, redesign and optimize the triple supply system configuration.

The invention optimizes the traditional natural gas tri-supply system by adopting the method of coupling the concentrating photovoltaic photothermal module and the traditional natural gas tri-supply system, increases system output, realizes cascaded utilization of energy, and can be better integrated with buildings.

Contents of the invention

The purpose of the present invention is to provide an integrated system of concentrating photovoltaic/solar-thermal coupled natural gas thermoelectricity-cooling triple supply system, which adds photovoltaic/photothermal components on the basis of traditional natural gas triple-supply system. Incorporate the electricity and heat generated by photovoltaic/photothermal components into the total system output, increase system efficiency, and realize energy cascade utilization and system optimization.

The purpose of the present invention is mainly achieved through the following technical solutions:

A concentrating photovoltaic/solar-thermal coupling natural gas heat, electricity and cooling triple supply integrated system, mainly including concentrating photovoltaic solar-thermal components (1), natural gas power supply system (2), heat pump (3), refrigeration equipment (4), user terminal (5). It is characterized in that: the concentrating photovoltaic photothermal module (1) and the natural gas power supply system (2) are coupled at the heat pump (3) and then sequentially connected to the refrigeration equipment (4) and the user end (5).

The invention adds photovoltaic/photothermal components on the basis of the traditional natural gas combined supply system. Incorporate the electricity and heat generated by photovoltaic/photothermal components into the total system output, increase system efficiency, and realize energy cascade utilization and system optimization.

The beneficial effects of the present invention are:

1. Increased the total output of the combined heat, power and cooling system

2. The combination of natural gas and solar energy is conducive to the reduction of carbon dioxide emissions

3. Realize the cascade utilization of energy, and the available resources can be sent to the user side according to the different needs of the user

4. It is easy to combine with buildings and is suitable for large-scale promotion.

Description of drawings

The present invention will be described in further detail below according to the accompanying drawings.

Figure 1 is a system schematic diagram of the integrated system of concentrating photovoltaic/photothermal coupling natural gas thermoelectricity cooling triple supply system.

Detailed ways

The accompanying drawings disclose a non-restrictive system schematic diagram of a preferred embodiment of the present invention, and the above solutions will be further described below in conjunction with specific embodiments.

Optimal design of a new type of low-power concentrating compound parabolic concentrator, a concentrating photovoltaic/photothermal coupled natural gas thermoelectric cooling triple supply integrated system, mainly including concentrated photovoltaic photothermal components (1), natural gas power supply system ( 2), heat pump (3), refrigeration equipment (4), user terminal (5). It is characterized in that: the concentrating photovoltaic photothermal module (1) and the natural gas power supply system (2) are coupled at the heat exchanger (3) and then sequentially connected to the refrigeration equipment (4) and the user end (5).

The working method of the system is: the hot water generated by the concentrated photovoltaic photothermal module (1) is heated up by the heat pump, part of it is used for heating and domestic water, and part of it drives the lithium bromide absorption refrigerator for cooling. The natural gas power supply system (2) burns natural gas to drive the gas turbine (2-1), and drives the generator (2-2) to generate electricity. The flue gas at the tail drives the refrigeration equipment (4) and heats the living space. Under normal circumstances, the concentrating photovoltaic solar thermal module (1) and the natural gas power supply system (2) work together to supply the needs of the user. When the lighting conditions are not good, the natural gas power supply system is mainly used to supply the needs of users. The coupling of the natural gas power supply system and the concentrating photovoltaic solar thermal components guarantees the needs of users throughout the year without being affected by lighting conditions.

The present invention is not limited to the above-mentioned best implementation mode, anyone can draw other various forms of products under the inspiration of the present invention, but no matter make any changes in its shape or structure, all those with the same or similar features as the present application Approximate technical solutions all fall within the protection scope of the present invention.

Claims (4)

1. A concentrating photovoltaic/solar-thermal coupled natural gas thermal power cooling triple supply integrated system, mainly including concentrating photovoltaic solar-thermal components (1), natural gas power supply system (2), heat pump (3), refrigeration equipment (4), User terminal (5); it is characterized in that: the concentrated photovoltaic photothermal module (1) and the natural gas power supply system (2) are coupled at the heat exchanger (3) and then connected to the refrigeration equipment (4) and the user terminal (5) connected in turn. 2. The concentrated photovoltaic photothermal module (1) according to claim 1, including MPPT controller (1-1), storage battery (1-2), photovoltaic inverter (1-3), grid-connected equipment ( 1-4), load (1-5); characterized in that: the MPPT controller (1-1) is connected to the storage battery (1-2), and the MPPT controller (1-1) is connected to the photovoltaic inverter (1-3 ), the photovoltaic inverter (1-3) is connected to the grid-connected device (1-4) and the load (1-5) respectively. 3. The natural gas power supply system (2) according to claim 1, comprising a gas turbine (2-1) and a generator (2-2); characterized in that: the gas turbine (2-1) is driven by burning natural gas and drives power generation The machine supplies power (2-2), and the generated waste heat flue gas enters the heat exchanger (3) to increase the temperature of the hot water generated by the concentrated photovoltaic photothermal components. 4. The refrigeration equipment according to claim 1, comprising a generator (4-1), a condenser (4-2), an evaporator (4-3) and an absorber (9-4), characterized in that: In the absorption refrigeration cycle, the generator (4-1), condenser (4-2), evaporator (9-3) and absorber (9-4) are sequentially connected to form a refrigeration cycle.