CN205864323U - A kind of photovoltaic and photothermal comprehensive utilization TRT - Google Patents

Abstract

The utility model discloses a photovoltaic photothermal comprehensive utilization power generation device, which comprises a photothermal power generation sub-system and a photovoltaic power generation sub-system coupled to each other; the photothermal power generation sub-system includes a Fresnel reflector arranged on a mirror field support , the composite parabolic concentrator receives the sunlight reflected by the Fresnel reflector and heats the medium in the heat collecting tube, and the heat collecting tube is connected with the work unit of the steam turbine through the heat transfer system; the photovoltaic power generation sub-system includes , the photovoltaic cell panel located on the back of the Fresnel reflector, and the combiner box, controller and inverter connected to the photovoltaic cell panel; the working mode of the utility model can be divided into independent photothermal power generation, independent photovoltaic power generation, or Simultaneous operation of power generation, comprehensive utilization of direct solar radiation and full radiation for power generation, will effectively improve the utilization efficiency of solar light resources.

Description

A photovoltaic photothermal comprehensive utilization power generation device

technical field

The utility model belongs to the technical field of solar power generation, and relates to a power generation device for comprehensive utilization of photovoltaic light and heat.

Background technique

Solar energy is undoubtedly the largest renewable energy source that can be developed on the earth at present. According to the different forms of conversion of solar radiation energy reaching the earth, the utilization of solar energy can be divided into two categories: photothermal and photovoltaic. Photothermal utilization can be divided into medium and low temperature utilization and high temperature utilization according to temperature. Medium and low temperature mainly include solar water heaters, solar building heating and cooling, solar seawater desalination, solar drying, etc.; high-temperature heat utilization mainly includes solar thermal power generation and solar thermochemistry. Photovoltaic power generation is a technology that directly converts light energy into electrical energy by using the photovoltaic effect at the semiconductor interface. The key element of this technology is the solar cell.

In solar thermal utilization, in addition to absorbing light energy of different wavelengths in the solar radiation spectrum through materials and converting it into thermal energy for direct use, concentrators can also be used to gather low-density solar energy to generate high-density energy, heating The working medium generates steam to drive the steam turbine to generate electricity. The focusing mode of the concentrator is point focus, line focus, etc. The biggest advantage of photovoltaic power generation is that there are no obvious restrictions on application occasions, and photovoltaic systems can be installed wherever there are sunlight resources. When the radiation is not good or at night, the photovoltaic system realizes continuous operation by charging and discharging the battery.

Fresnel solar power generation technology is one of the ways to utilize solar heat. Photothermal power generation needs to utilize the normal direct radiation of sunlight, and the solar radiation intensity is generally required to be greater than 300-400W/m ² . Photovoltaic power generation can use the full radiation of sunlight, and has lower requirements on sunlight resources.

Contents of the invention

The technical problem solved by the utility model is to provide a photovoltaic photothermal comprehensive utilization power generation device, including a photothermal power generation sub-system and a photovoltaic power generation sub-system, which can operate the photothermal system or the photovoltaic system simultaneously or separately according to the change of the solar radiation intensity operation, realize the comprehensive utilization of photovoltaic light and heat, and improve the utilization efficiency of solar energy resources.

The utility model is realized through the following technical solutions:

A photovoltaic photothermal comprehensive utilization power generation device, including a photothermal power generation sub-system and a photovoltaic power generation sub-system coupled to each other; The concentrator 3 receives the sunlight reflected by the Fresnel reflector 1 and heats the medium in the heat collecting tube 2, and the heat collecting tube 2 is connected with the work unit of the steam turbine through a heat transfer system; 4, the photovoltaic cell panel 5 located on the back of the Fresnel reflector 1, and the combiner box, controller and inverter connected to the photovoltaic cell panel 5.

According to the intensity of solar radiation, the photothermal power generation sub-system and the photovoltaic power generation sub-system work simultaneously or independently.

When the solar radiation intensity is greater than the design value of the photothermal power generation subsystem, part of the Fresnel reflector 1 rotates to face away from the sun, maintains the temperature design value of the heat collector 2, and maintains the rated photothermal power generation efficiency; the Fresnel reflector 1 rotates Afterwards, the photovoltaic cell panel 5 exposed to sunlight generates power, and the photothermal power generation sub-system and the photovoltaic power generation sub-system work simultaneously;

When the solar radiation intensity is lower than 300-400W/ ^m2 , the Fresnel reflector 1 rotates and exposes the photovoltaic cell panel 5, and the photovoltaic cell panel 5 uses a tracking system to track the sun and absorb the full radiation of sunlight for photovoltaic power generation;

When the solar radiation intensity is close to the design value of the photothermal power generation subsystem, the photothermal power generation subsystem generates power, and the photovoltaic cell panel 5 generates power by absorbing scattered light and radiation lost in shading and shadowing.

The mirror field support 4 is erected on the rotation axis 6 and can rotate around the rotation axis 6 between 0° and 360° to drive the rotation of the Fresnel reflector 1 and the photovoltaic panel 5 .

Compared with the prior art, the utility model has the following beneficial technical effects:

The utility model provides photovoltaic photothermal comprehensive utilization power generation device. According to the change of radiation intensity, the photovoltaic battery panel and Fresnel reflector can rotate around the rotation axis of the bracket. According to the change of solar radiation intensity, the working mode of the device can be divided into independent Photothermal power generation, independent photovoltaic power generation, or simultaneous operation of power generation, comprehensive utilization of direct solar radiation and full radiation for power generation, will effectively improve the utilization efficiency of solar light resources.

The photovoltaic photothermal comprehensive utilization power generation device provided by the utility model, when the independent photothermal power generation is running, the photovoltaic power generation system can still operate, realizing the photovoltaic photothermal comprehensive utilization; and because the photovoltaic power generation system belongs to the tracking photovoltaic power generation system, the efficiency of photovoltaic power generation is improved ; Moreover, the adaptability to the intensity of solar radiation is enhanced, the stability of the system is improved, and the adaptability of the solar energy comprehensive utilization device is improved.

The photovoltaic photothermal comprehensive utilization power generation device provided by the utility model improves the utilization efficiency of solar energy resources through the effective utilization of the mirror field shielding and shadow area during the operation of the photothermal system by the photovoltaic power generation system. Moreover, the photovoltaic battery panel and the Fresnel reflector of the device share a set of brackets, which saves the cost of the bracket, reduces the occupied area, and enhances the adaptability to the intensity of solar radiation.

Description of drawings

Fig. 1 is a schematic structural diagram of a power generation device for comprehensive utilization of photovoltaic light and heat.

Fig. 2 is a schematic diagram of a photovoltaic cell panel and a Fresnel reflector bracket.

detailed description

The utility model will be described in further detail below in conjunction with the accompanying drawings, which is an explanation of the utility model rather than a limitation.

Referring to FIG. 1 , a photovoltaic photothermal comprehensive utilization power generation device includes a photothermal power generation sub-system and a photovoltaic power generation sub-system coupled to each other; the photothermal power generation sub-system includes a Fresnel reflector arranged on the mirror field support 4 1. The composite parabolic concentrator 3 receives sunlight reflected by the Fresnel reflector 1 and heats the medium in the heat collecting tube 2, and the heat collecting tube 2 is connected to the steam turbine working unit through a heat transfer system; the photovoltaic power generation sub-system includes a set On the mirror field support 4 , the photovoltaic cell panel 5 located on the back of the Fresnel reflector 1 , and the combiner box, controller and inverter connected to the photovoltaic cell panel 5 .

According to the intensity of solar radiation, the photothermal power generation sub-system and the photovoltaic power generation sub-system work simultaneously or independently.

When the solar radiation intensity is greater than the design value of the photothermal power generation subsystem, part of the Fresnel reflector 1 rotates to face away from the sun, maintains the temperature design value of the heat collector 2, and maintains the rated photothermal power generation efficiency; the Fresnel reflector 1 rotates Afterwards, the photovoltaic cell panel 5 exposed to sunlight generates power, and the photothermal power generation sub-system and the photovoltaic power generation sub-system work simultaneously;

When the solar radiation intensity is lower than 300-400W/ ^m2 , the Fresnel reflector 1 rotates and exposes the photovoltaic cell panel 5, and the photovoltaic cell panel 5 uses a tracking system to track the sun and absorb the full radiation of sunlight for photovoltaic power generation;

When the solar radiation intensity is close to the design value of the photothermal power generation subsystem, the photothermal power generation subsystem generates power, and the photovoltaic cell panel 5 generates power by absorbing scattered light and radiation lost in shading and shadowing.

The mirror field support 4 is erected on the rotation axis 6 and can rotate around the rotation axis 6 between 0° and 360° to drive the rotation of the Fresnel reflector 1 and the photovoltaic panel 5 .

Specific examples are given below.

As shown in Figure 1, the utility model is a power generation device for comprehensive utilization of photovoltaic light and heat, which includes a line-focus Fresnel photothermal power generation sub-system and a photovoltaic power generation sub-system. On the back of the Fresnel reflector 1 in the electronic system, the photovoltaic cell panel 5 and the Fresnel reflector 1 share a support to realize comprehensive utilization of photovoltaic light and heat. Among them, the photothermal power generation sub-system includes a Fresnel reflector 1, a heat collector 2, a compound parabolic concentrator 3, a mirror field support 4, a steam turbine work unit, and other auxiliary units. The photovoltaic power generation subsystem mainly includes photovoltaic panels 5 and accessories such as a combiner box, a controller, and an inverter. As shown in FIG. 2 , the photovoltaic panel 5 and the Fresnel reflector 1 share a support, and the photovoltaic panel 5 and the Fresnel reflector 1 can rotate around the rotation axis 6 of the support 4 at the same time.

When the solar radiation intensity is greater than the design value of the photothermal power generation subsystem, part of the Fresnel reflectors can face away from the sun, maintain the design value of the collector temperature, and maintain the rated photothermal efficiency. Comprehensive utilization; when the solar radiation intensity is low, generally less than 300-400W/m2, the photovoltaic panels use a tracking system to track the sun, absorb the full radiation of sunlight, and use photovoltaic power generation; When the value is near, it mainly relies on photothermal power generation, and photovoltaic panels absorb scattered light and radiation lost by shading and shadowing.

The embodiments given above are preferred examples for realizing the utility model, and the utility model is not limited to the above-mentioned embodiments. Any non-essential additions and substitutions made by those skilled in the art according to the technical features of the technical solutions of the present invention belong to the protection scope of the present invention.

Claims (4)

1. A photovoltaic photothermal comprehensive utilization power generation device, characterized in that it includes a photothermal power generation sub-system and a photovoltaic power generation sub-system coupled to each other; The Neil reflector (1), the compound parabolic concentrator (3) receives the sunlight reflected by the Fresnel reflector (1) and heats the medium in the heat collecting tube (2), and the heat collecting tube (2) communicates with the heat transfer system The steam turbine working unit is connected; the photovoltaic power generation subsystem includes a photovoltaic cell panel (5) arranged on the mirror field support (4) and located at the back of the Fresnel reflector (1), and a photovoltaic cell panel (5) connected to the Connected combiner boxes, controllers and inverters. 2. The photothermal comprehensive utilization power generation device according to claim 1, characterized in that, according to the intensity of solar radiation, the photothermal power generation sub-system and the photovoltaic power generation sub-system work simultaneously or independently. 3. The photovoltaic photothermal comprehensive utilization power generation device according to claim 1 or 2, characterized in that, when the solar radiation intensity is greater than the design value of the photothermal power generation sub-system, part of the Fresnel reflector (1) rotates to face away from the The sun maintains the temperature design value of the heat collecting tube (2) and maintains the rated photothermal power generation efficiency; after the Fresnel reflector (1) is rotated, the photovoltaic panel (5) exposed to sunlight generates electricity, and the photothermal power generation sub-system and The photovoltaic power generation sub-system works simultaneously; When the solar radiation intensity is lower than 300-400W/ ^m2 , the Fresnel reflector (1) rotates and exposes the photovoltaic cell panel (5), and the photovoltaic cell panel (5) uses a tracking system to track the sun and absorb the full radiation of sunlight PV; When the solar radiation intensity is near the design value of the photothermal power generation subsystem, the photothermal power generation subsystem generates electricity, and meanwhile, the photovoltaic cell panel (5) generates electricity by absorbing scattered light and radiation lost in shading and shadowing. 4. The photovoltaic photothermal comprehensive utilization power generation device according to claim 3, characterized in that, the mirror field support (4) is erected on the rotation axis (6), and can rotate around the rotation axis (6) at 0 degrees ~ 360 degrees to rotate, driving the rotation of the Fresnel reflector (1) and the photovoltaic panel (5).