CN206571625U - Solar-thermal generating system - Google Patents

Abstract

The utility model provides a photothermal power generation system, which includes a wind power conversion device for converting wind energy into electric energy, a controller connected to the wind power conversion device and a power grid, an electric heating device, and used for converting light energy into The thermal energy photothermal conversion device, heat storage device and steam turbine power generation device, the controller selectively supplies the electric energy generated by the wind power conversion device to the electric heating device; the heat storage device contains a medium, and the heat storage device and the photothermal conversion device Capable of heat exchange, the medium is heated by an electric heating device and/or heated by thermal energy from a light-to-heat conversion device to generate steam; the steam turbine power generation device is connected to the heat storage device and the grid separately to receive steam from the heat storage device and generate Electrical energy for transmission to the grid. According to the photothermal power generation system of the utility model, most of the abandoned wind can be reduced, and the wind energy during the abandoned wind can be converted into electric energy without increasing the investment of wind energy power generation and photothermal power generation.

Description

CSP system

technical field

The utility model generally relates to the energy field, and more specifically relates to a photothermal power generation system.

Background technique

The characteristic of wind power generation is that the power generation capacity is relatively strong when the load is low, but users do not have strong demand during the low load, and there is no large-capacity energy storage equipment at this stage, so wind curtailment occurs.

There are four main reasons for the "abandonment" of wind power generation:

1. The planning of the wind farm and the planning of the power grid are inconsistent to some extent. The construction speed of the wind farm is not synchronized with the entire power grid, especially the construction of the transmission project, which affects the normal operation of the wind farm.

2. Due to local economic development and industrial structure, wind power cannot be completely consumed locally, so part of the power has to be sent out. Then in the process of sending out, the lack of capacity of the sending transmission line also affects the sending out.

3. Wind power itself is uncertain and intermittent. Its operation requires the cooperation of the power grid, that is, it needs to do a good job in peak regulation. In some places, the peak-shaving capacity of the power grid is insufficient, especially in the three north regions, such as North China, Northeast China, and Northwest China, where heating needs to be carried out in winter. This needs to ensure the operation of the heating unit first, which leads to problems in peak shaving. If the method is not allowed, it will also lead to wind abandonment.

Fourth, the mechanism and policy of the entire wind farm operation need to be further improved.

According to statistics, wind power curtailment in some provinces and cities in my country reaches about 20%, and some areas with rich wind resources in the "Three Norths" (Northeast, North China, and Northwest) may exceed 30%, with direct economic losses reaching nearly 10 billion yuan.

However, the load of solar thermal power generation is mainly concentrated in the daytime. Through the heat storage device, the steam turbine generator set can operate at low load at night. If it is necessary to generate electricity at full load at night, it is necessary to increase the investment in the mirror field and heat storage device or increase the fuel such as coal. , natural gas and other non-renewable resources to increase the operation rate and full load rate of steam turbines.

The existing technology adopts the complementary method of wind and electricity to solve the impact on the grid caused by wind power fluctuations. The technical solution is that wind power and photovoltaic power generation respectively supply DC power directly to the battery pack for charging through corresponding controllers, and then send it to the grid through the inverter. to the grid. This can make up for the lack of independent power generation, effectively reduce the fluctuation of transmission power when they operate independently, and reduce the partial curtailment of wind or light.

However, although the existing wind-solar hybrid system can solve some wind curtailment, it will also have some adverse effects on the power grid, such as the island effect, harmonic pollution, etc., and it cannot solve the wind curtailment during the winter heating power grid peak regulation in the Three North Region question.

Therefore, it is necessary to provide a photothermal power generation system to at least partly solve the above-mentioned problems.

Utility model content

In order to at least partly solve the above technical problems, according to one aspect of the present invention, a photothermal power generation system is provided, which is characterized in that it includes:

A wind power conversion device, the wind power conversion device is used to convert wind energy into electrical energy;

a controller, the controller is connected to the wind power conversion device and connected to the power grid;

an electric heating device, the controller selectively supplies the electric energy generated by the wind power conversion device to the electric heating device;

A light-to-heat conversion device for converting light energy into heat energy;

A heat storage device, the heat storage device contains a medium, and the heat storage device can exchange heat with the photothermal conversion device, the medium is heated by the electric heating device and/or is heated by the photothermal said thermal energy of the converting means is heated to generate steam;

a steam turbine generator connected to the heat storage device and the grid to receive the steam from the heat storage device and generate electrical energy for transmission to the grid.

Optionally, the steam turbine power generation device includes a generator and a steam turbine or an extraction unit connected to the generator.

Optionally, a steam generation device connected to the steam turbine power generation device is also included, and the steam generation device is used for generating steam.

Optionally, the steam generating device includes at least one of a gas-fired boiler, a coal-fired boiler and a biomass boiler.

Optionally, the controller is connected to the grid via a transformer, so as to boost the voltage of the electric energy generated by the wind power conversion device.

Optionally, the steam turbine power generation device is connected to the power grid via a booster station, so as to boost the voltage of the electric energy generated by the steam turbine power generation device.

Optionally, the light-to-heat conversion device includes a heat collecting tube extending into the medium of the heat storage device.

Optionally, the steam turbine power generation device has a pipeline extending into the medium of the heat storage device, so that the water generated by the steam turbine power generation device can be absorbed by the heat storage device through the pipeline. Heat to steam.

Optionally, the controller selectively supplies the electric energy according to whether the electric energy generated by the wind power conversion device meets the requirements of the grid and/or whether the grid allows grid-connected power generation.

According to the photothermal power generation system of the present invention, when the wind power conversion device meets the requirements through the controller, it can be directly transmitted to the grid through the transformer and then sent to the user. If the electricity generated by the wind power conversion device does not meet the requirements of the grid or When the grid restricts the wind power conversion device to be connected to the grid for power generation, the electricity generated by the wind power conversion device is heated by the electric heating device to heat the medium in the heat storage device, so that the electric energy converted from wind energy can participate in the process of solar thermal power generation. It can reduce most of the wind curtailment, convert the wind energy during the wind curtailment period into electrical energy, then into heat energy, and finally into electrical energy, without additional investment in wind power generation and solar thermal power generation.

Description of drawings

In order that the advantages of the invention may be better understood, the invention briefly described above will be described in more detail by referring to specific embodiments that are illustrated in the appended drawings. It can be understood that these drawings only depict typical embodiments of the utility model, and therefore should not be considered as limiting its protection scope, and the utility model is described and explained with additional characteristics and details by the accompanying drawings.

FIG. 1 is a schematic diagram of an embodiment of a photothermal power generation system of the present invention.

Explanation of reference signs:

1: Wind power conversion device 2: Controller

3: Transformer 4: Grid

5: User 6: Light-to-heat conversion device

7: heat storage device 8: electric heating device

9: Turbine 10: Generator

11: Booster station

detailed description

In the following discussion, details are presented in order to provide a more thorough understanding of the present invention. However, one skilled in the art will understand that the present invention may be practiced without one or more of these details. In a specific example, in order to avoid confusion with the present invention, some technical features known in the art are not described in detail. It should be noted that the terms "upper", "lower", "front", "rear", "left", "right" and similar expressions used herein are for the purpose of illustration only, not limitation.

As shown in Figure 1, the utility model provides a photothermal power generation system, which includes a wind power conversion device 1, a controller 2, an electric heating device 8, a photothermal conversion device 6, a heat storage device 7 and a steam turbine power generation device.

Among them, the wind power conversion device 1 is used to convert wind energy into electrical energy. The controller 2 is connected to the wind power conversion device 1 and to the grid 4 . The controller 2 selectively supplies the electric energy generated by the wind power conversion device 1 to the electric heating device 8 . The light-to-heat conversion device 6 is used to convert light energy into heat energy.

The heat storage device 7 contains a medium (for example, water), and the thermal energy of the light-to-heat conversion device 6 can be delivered to the heat storage device 7, for example, through the medium (higher temperature) in the light-to-heat conversion device 6 and the heat storage device The heat exchange between the medium (lower temperature) in 7 makes the medium in the heat storage device 7 heated by the electric heating device 8 and/or heated by the thermal energy from the light-to-heat conversion device 6 to generate steam.

The steam turbine power generation device is connected with the heat storage device 7 and the grid 4 to receive steam from the heat storage device 7 and generate electric energy for transmission to the grid 4 . The steam turbine power generation device includes a generator 10 and a steam turbine 9 or an extraction steam unit connected to the generator 10 .

Continuing to refer to FIG. 1 , the controller 2 can selectively supply electric energy according to, for example, whether the electric energy generated by the wind power conversion device 1 meets the requirements of the grid 4 and/or whether the grid 4 allows grid-connected power generation.

Therefore, when the controller 2 judges that the electricity generated by the wind power conversion device 1 can be connected to the grid, the power generated by the wind power conversion device 1 is sent to the transformer 3 through the controller 2, and then boosted and sent to the customer through the grid 4 place.

When the electricity generated by wind power cannot be connected to the grid for various reasons, the electric energy generated by the wind power conversion device 1 is sent to the electric heating device 8 installed in the heat storage device 7 through the controller 2 to heat the heat storage device 7 medium (such as water), thereby converting electrical energy into thermal energy.

The process of photothermal power generation is that the photothermal conversion device 6 such as a mirror field absorbs sunlight and heats the medium in the heat collection tube of the photothermal conversion device 6, and then the medium in the heat collection tube is transported to the storage tank through the first circulation pipeline. The heat device 7 exchanges heat with the medium in the heat storage device 7 to heat the medium in the heat storage device 7 .

The medium in the heat storage device 7 heats the water from the steam turbine 9 (turbine room) into superheated steam through the second circulation pipeline, and sends it back to the steam turbine 9 to drive the generator 10 to generate electricity. Afterwards, the electric energy of the generator 10 is delivered to the substation, and then sent to the user 5 through the grid 4 after being connected to the grid. Thereby, utilization of abandoned wind by wind power generation can be realized.

According to the photothermal power generation system of the present utility model, when the wind power conversion device 1 judges that it meets the conditions through the controller 2, it can be directly transmitted to the power grid 4 through the transformer 3 and then sent to the user 5. If the power generated by the wind power conversion device 1 does not meet the requirements When required by the grid 4 or when the grid 4 restricts the wind power conversion device 1 to be connected to the grid for power generation, the electricity generated by the wind power conversion device 1 is heated by the electric heating device 8 to heat the medium in the heat storage device 7, so that the electric energy converted by the wind energy can be used in the light During thermal power generation. It can reduce most of the wind curtailment, convert the wind energy during the wind curtailment period into electrical energy, then into heat energy, and finally into electrical energy, without additional investment in wind power generation and solar thermal power generation.

The structures of the generator 10 and the steam turbine or steam extraction unit are well known to those skilled in the art and will not be described herein.

In order to increase the stability of the system, the system may also include a steam generating device connected to the steam turbine power generation device, and the steam generating device is used to generate steam. For example, when the thermal energy generated by the light-to-heat conversion device is insufficient due to insufficient sunlight or at night, the steam generation device can be used to generate steam so that the steam turbine power generation device can continue to work. Further, the steam generating device may include at least one of a gas-fired boiler, a coal-fired boiler and a biomass boiler. In this way, the steam generated by the heat storage device 7 can be sent to the steam turbine power generation device together with the steam generated by the steam generating device.

Optionally, the controller 2 may be connected to the grid 4 via the transformer 3 for boosting the electric energy generated by the wind power conversion device 1 . The steam turbine generator can be connected to the grid 4 via a booster station 11 for boosting the electrical energy generated by the turbine generator.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the present invention. The terminology used herein is only for describing specific implementation purposes, and is not intended to limit the utility model. Where terms such as "component" appear herein, they may refer to either a single part or a combination of parts. Terms such as "mounting", "disposing", etc. appearing herein may mean that one component is directly attached to another component, or that one component is attached to another component through an intermediary. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in that other embodiment or stated otherwise.

The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of illustration and description, and are not intended to limit the utility model to the scope of the described embodiments. Those skilled in the art can understand that more variations and modifications can be made according to the teaching of the utility model, and these variations and modifications all fall within the protection scope of the utility model.

Claims (9)

1. a kind of solar-thermal generating system, it is characterised in that including：

Wind power conversion device, the wind power conversion device is used to wind energy being converted to electric energy；

Controller, the controller is connected with the wind power conversion device, and is connected with power network；

Electric heater unit, the electric energy that the controller optionally produces the wind power conversion device is supplied to the electricity Heater；

Photothermal conversion device, the photothermal conversion device is used to convert light energy into heat energy；

Medium is accommodated in heat-storing device, the heat-storing device, and the heat-storing device can with the photothermal conversion device Heat exchange, the medium is heated by the electric heater unit and/or by the heat energy from the photothermal conversion device Heating, to produce steam；

Turbine generator device, the turbine generator device is connected with the heat-storing device and the power network, to receive from described The steam of heat-storing device is simultaneously produced for transmitting to the electric energy of the power network.

2. solar-thermal generating system according to claim 1, it is characterised in that the turbine generator device include generator with And the steam turbine or steam-extracting type unit being connected with the generator.

3. solar-thermal generating system according to claim 1, it is characterised in that also including being connected with the turbine generator device Steam generation device, the steam generation device be used for produce steam.

4. solar-thermal generating system according to claim 3, it is characterised in that the steam generation device includes gas-fired boiler At least one of stove, coal-burning boiler and biomass boiler.

5. solar-thermal generating system according to claim 1, it is characterised in that the controller is via transformer and the electricity Net connection, for the electric energy boosting for producing the wind power conversion device.

6. solar-thermal generating system according to claim 1, it is characterised in that the turbine generator device via booster stations with The power network connection, for the electric energy boosting for producing the turbine generator device.

7. solar-thermal generating system according to claim 1, it is characterised in that the photothermal conversion device includes extending into Thermal-collecting tube in the medium of the heat-storing device.

8. solar-thermal generating system according to claim 1, it is characterised in that the turbine generator device, which has, to be extended into Pipeline in the medium of the heat-storing device, to enable the water that the turbine generator device is produced via the pipeline Steam is heated to be by the heat-storing device.

9. solar-thermal generating system according to claim 1, it is characterised in that the controller is according to the wind-powered electricity generation converting means Whether the electric energy for putting generation meets whether grid requirements and/or the power network allow to generate electricity by way of merging two or more grid systems and be selectively supplied with institute State electric energy.