CN217590280U - System for supplying electricity to coal mill by directly connecting photovoltaic power generation to thermal power plant - Google Patents

Abstract

The utility model relates to the technical field of combined power generation, in particular to a system in which photovoltaic power generation is directly connected to a thermal power plant to supply electricity for coal mills. The system includes: a busbar for a coal mill of a coal-fired power station; a photovoltaic power generation branch circuit, on which a photovoltaic power station outlet switch is arranged, and the end of the photovoltaic power generation branch is electrically connected to the busbar for a coal mill of the coal-fired power station; A power generation branch circuit, on which a coal-fired power station power switch is arranged, and the end of the coal-fired power generation branch circuit is electrically connected with the busbar for the coal mill of the coal-fired power station; The transfer device, the coal mill, the pulverized coal silo, the primary fan and the boiler, the coal transfer device, the coal mill and the primary fan are all electrically connected with the busbar of the coal mill in the coal-fired power station. The system of the utility model can reduce the coal consumption of the thermal power plant, improve the power efficiency of the thermal power plant output to the outside, and at the same time can effectively improve the photovoltaic local consumption capacity of the solar energy resource-enriched area.

Description

A system in which photovoltaic power generation is directly connected to a thermal power plant to supply power to a coal mill

technical field

The utility model relates to the technical field of combined power generation, in particular to a system in which photovoltaic power generation is directly connected to a thermal power plant to supply electricity for coal mills.

Background technique

With the increase of my country's electricity demand and the rapid growth of the installed capacity of new energy power stations, relying on large-scale energy bases for power generation and long-distance transmission has become an important form of my country's power supply. However, new energy power generation has randomness and volatility, which has resulted in the phenomenon of large-scale abandonment of wind and light. As a controllable and reliable power generation method, thermal power generation is the mainstream choice for power supply in countries around the world.

In traditional thermal power plants, some auxiliary equipment of the power plant, such as coal mills, blowers, induced draft fans, etc., also need to be self-sufficient in electrical energy, that is, part of the electricity produced by thermal power plants is used for their own consumption, which leads to thermal power plants. The plant electricity consumption rate is between 5% and 6%. However, with the continuous consumption of fossil energy and the requirement of clean energy, how to improve the power efficiency of thermal power plant's external output has also become a key research field.

Utility model content

Therefore, the technical problem to be solved by the present invention is to overcome the defect of the low efficiency of electric energy output by thermal power plants in the prior art, so as to provide a system for directly connecting photovoltaic power generation to thermal power plants to supply electricity for coal mills.

The photovoltaic power generation system provided by the utility model is directly connected to the thermal power plant to supply electricity for the coal mill, including:

Busbar for coal mill in coal-fired power station;

A photovoltaic power generation branch circuit, on which a photovoltaic power station outlet switch is arranged, and the end of the photovoltaic power generation branch circuit is electrically connected with the busbar of the coal mill of the coal-fired power station;

The coal-fired power generation branch circuit is provided with a coal-fired power station power switch, and the end of the coal-fired power generation branch circuit is electrically connected with the coal-fired power station pulverizer busbar;

A coal conveying branch, which includes a coal transfer device, a coal mill, a pulverized coal bunker, a primary fan and a boiler connected in sequence, and the coal transfer device, the coal mill and the primary fan are all used with the coal mill in the coal-fired power station Busbar electrical connection.

Optionally, the photovoltaic power generation branch includes photovoltaic modules, a combiner box, an inverter and a photovoltaic power station transformer connected in sequence, and the photovoltaic power station outlet switch is located between the photovoltaic power station transformer and the coal mill of the coal-fired power station. between the busbars.

Optionally, the rated power of the photovoltaic module is 0.8 of the total power of the coal transfer device, the coal mill and the primary fan.

Optionally, the coal-fired power generation branch includes a turbine device, a generator, and a coal-fired power plant power transformer connected in sequence, and the coal-fired power station power switch is located between the coal-fired power station power transformer and the coal-fired power plant power transformer. Between the busbars of the coal mill in the coal-fired power station.

Optionally, the storage capacity of the pulverized coal silo is to meet the coal consumption required by the coal-fired power plant to output for 4 hours at rated power.

Optionally, the coal conveying branch further includes:

The primary wind power heating device is located between the primary fan and the boiler, and is electrically connected to the busbar of the coal mill in the coal-fired power station.

Optionally, a primary wind power heating device switch is provided between the primary wind power heating device and the busbar for the pulverizer of the coal-fired power station.

Optionally, the rated heating power of the primary wind electric heating device can increase the temperature of the primary wind to 400°C.

The technical scheme of the utility model has the following advantages:

1. The photovoltaic power generation provided by the utility model is directly connected to the thermal power plant to supply the coal mill power system, and the photovoltaic power generation is directly connected to the coal-fired power plant’s coal mill busbar, and the electrical energy produced by the photovoltaic power station is used to supply the thermal power plant. For electricity use, the thermal power generating units are used as backup and supplementary power sources to form a multi-energy complementary power supply system for thermal power plants; it can reduce the coal consumption of thermal power plants, improve the power efficiency of thermal power plants’ external output, and also effectively improve the solar energy resource-rich areas. Photoelectric on-site consumption capacity; use fluctuating solar energy for plant power consumption, realize stable and high-quality power supply from coal-fired power plants to the grid, and achieve multi-energy complementarity.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the following descriptions The accompanying drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

1 is a schematic structural diagram of a system in an embodiment of the present invention;

FIG. 2 is a flow chart of the operation of the system in the embodiment of the present invention.

Description of reference numbers:

1. Busbar for coal mill of coal-fired power station; 21. Outgoing switch of photovoltaic power station; 22. Photovoltaic module; 23. Combiner box; 24. Inverter; 25. Transformer of photovoltaic power station; 31. Power switch of coal-fired power station; 32. Turbine device; 33. Generator; 34. Power transformer for coal-fired power station; 41. Coal transfer device; 42. Coal mill; 43. Coal powder silo; 44. Primary fan; 45. Boiler; 46. Primary wind power heating device; 47. Switch of primary wind power heating device.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as there is no conflict with each other.

Example 1

As shown in Figure 1, a specific implementation of a system for directly connecting photovoltaic power generation to a thermal power plant to supply power to coal mills includes:

Bus 1 for coal mill in coal-fired power station;

The photovoltaic power generation branch is provided with a photovoltaic power station outlet switch 21, and the end of the photovoltaic power generation branch is electrically connected to the bus 1 for the coal mill of the coal-fired power station;

The coal-fired power generation branch is provided with a coal-fired power station power switch 31, and the end of the coal-fired power generation branch is electrically connected to the coal-fired power station pulverizer bus 1;

The coal conveying branch includes a coal transfer device 41, a coal mill 42, a pulverized coal bunker 43, a primary fan 44 and a boiler 45 connected in sequence. The coal transfer device 41, the coal mill 42 and the primary fan 44 are all connected to the coal-fired power station. The coal mill is electrically connected with the bus bar 1 .

The above system directly connects the photovoltaic power generation to the busbar of the coal mill 42 in the coal-fired power plant, and uses the electric energy produced by the photovoltaic power station to supply the power for the thermal power plant. The power supply system for power plants; it can reduce the coal consumption of thermal power plants, improve the power efficiency of thermal power plants’ external output, and at the same time, it can effectively improve the photovoltaic local consumption capacity of solar energy resource-rich areas; Coal-fired power plants provide stable and high-quality electric power to the grid to achieve multi-energy complementarity.

The specific structure of the photovoltaic power generation branch is not limited, as long as it can utilize solar energy to generate power. In this embodiment, the photovoltaic power generation branch circuit includes photovoltaic modules 22, a combiner box 23, an inverter 24 and a photovoltaic power station transformer 25 connected in sequence. The photovoltaic power station outlet switch 21 is located between the photovoltaic power station transformer 25 and the busbar for the coal mill of the coal-fired power station. between 1. Preferably, the rated power of the photovoltaic module 22 is 0.8 of the total power of the coal transfer device 41 , the coal pulverizer 42 and the primary fan 44 .

The specific structure of the coal-fired power generation branch is not limited, as long as it can generate thermal power. In this embodiment, the coal-fired power generation branch includes a turbine device 32, a generator 33 and a power transformer 34 for the coal-fired power station connected in sequence. The power switch 31 for the power station of the coal-fired power station is located between the power transformer 34 of the coal-fired power station Between busbars 1 for coal mills in coal-fired power stations.

Preferably, the storage capacity of the pulverized coal bunker 43 is sufficient to meet the coal consumption required by the coal-fired power plant to output for 4 hours at rated power.

Further, the coal conveying branch further includes a primary wind power heating device 46, which is located between the primary fan 44 and the boiler 45, and is electrically connected to the bus bar 1 for the pulverizer of the coal-fired power station. The wind formed by the primary fan 44 can be heated by the primary wind electric heating device 46 , thereby saving the energy consumption of the boiler 45 .

Further, a primary wind power heating device switch 47 is provided between the primary wind power heating device 46 and the busbar 1 for the pulverizer of the coal-fired power station. Through the switch 47 of the primary wind power heating device, the primary wind power heating device 46 can be controlled to start only when the light energy is sufficient, so as to avoid increasing the energy consumption of the coal-fired power generation branch.

Preferably, the rated heating power of the primary wind electric heating device 46 can increase the temperature of the primary wind to 400°C.

2, based on the above-mentioned specific implementation form, the operation process of the system of the present application is as follows:

1) When the 33 groups of generators of the coal-fired power plant are running at night, the power switch 31 of the coal-fired power station is closed, the outlet switch 21 of the photovoltaic power station is disconnected, the bus 1 for the coal mill of the coal-fired power station is electrified, and the coal is transferred to the rotating set and the coal mill. 42. The primary fans 44 are all powered by coal-fired units. At this time, the switch 47 of the primary wind power heating device is disconnected, and the primary wind power heating device 46 stops working;

2) When the light intensity increases during the day, the output power of the photovoltaic module 22 increases, and the photovoltaic power station transformer 25 is charged. At this time, the photovoltaic power station outlet switch 21 is closed, and the photovoltaic power plant is directly connected to the coal-fired power station. ;

3) If the light intensity continues to increase during the day, the output power of the photovoltaic module 22 is greater than the total power consumption of the coal rotating device, the coal mill 42 and the primary fan 44. At this time, the power switch 31 of the coal-fired power station is turned off and the primary wind power heating device is turned off. The switch 47 is closed, and the primary wind electric heating device 46 starts to work;

4) When the light intensity decreases during the day, the output power of the photovoltaic module 22 is less than the total power consumption of the coal rotating unit, the coal mill 42 and the primary fan 44. At this time, the power switch 31 of the coal-fired power station is closed, and the primary wind power heating device is switched on and off. 47 is disconnected, and the primary wind power heating device 46 stops working;

5) When the light intensity during the day continues to decrease and the output power of the photovoltaic modules 22 is zero, the outgoing switch 21 of the photovoltaic power station is turned off, and the generator 33 group of the coal-fired power plant resumes operation at night.

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. And the obvious changes or changes derived from this are still within the protection scope of the present invention.

Claims (8)

1. a system of photovoltaic power generation directly accessing thermal power plant to supply coal mill electricity, is characterized in that, comprises: A busbar (1) for a coal mill in a coal-fired power station; A photovoltaic power generation branch circuit, on which a photovoltaic power station outlet switch (21) is arranged, and the end of the photovoltaic power generation branch circuit is electrically connected with the busbar (1) for the coal mill of the coal-fired power station; A coal-fired power generation branch circuit, on which a coal-fired power station power switch (31) is arranged, and the end of the coal-fired power generation branch circuit is electrically connected to the coal-fired power station busbar (1) for a pulverizer; A coal conveying branch, comprising a coal transfer device (41), a coal mill (42), a pulverized coal bunker (43), a primary fan (44) and a boiler (45) connected in sequence, the coal transfer device (41) , the coal mill (42) and the primary fan (44) are all electrically connected to the busbar (1) for the coal mill in the coal-fired power station. 2. The system for directly connecting photovoltaic power generation to a thermal power plant to supply electricity for coal mills according to claim 1, wherein the photovoltaic power generation branch comprises photovoltaic modules (22) and combiner boxes (23) connected in sequence. , an inverter (24) and a photovoltaic power station transformer (25), the photovoltaic power station outlet switch (21) is located between the photovoltaic power station transformer (25) and the coal-fired power station busbar (1) for the pulverizer. 3. The system for directly connecting photovoltaic power generation to a thermal power plant to supply electricity for coal mills according to claim 2, characterized in that the rated power of the photovoltaic components (22) is the coal transfer device (41), the mill 0.8 of the total power of the coal machine (42) and the primary fan (44). 4. The system for directly connecting photovoltaic power generation to a thermal power plant to supply power to a coal mill according to claim 1, wherein the coal-fired power generation branch comprises a turbine device (32), a generator (32) that are connected in sequence. 33) and a plant power transformer (34) for a coal-fired power station, wherein the power switch (31) for the coal-fired power station is located between the power transformer (34) for the coal-fired power station and the busbar for a pulverizer of the coal-fired power station (1) between. 5. The system for directly connecting photovoltaic power generation to a thermal power plant to supply power to a coal mill according to claim 1, wherein the storage capacity of the pulverized coal bunker (43) is to satisfy the output of the coal-fired power plant at rated power. Coal consumption required for 4 hours. 6. The system for directly connecting photovoltaic power generation to a thermal power plant to supply electricity for coal mills according to any one of claims 1-5, wherein the coal conveying branch further comprises: A primary wind electric heating device (46) is located between the primary fan (44) and the boiler (45), and is electrically connected to the busbar (1) for the coal mill of the coal-fired power station. 7. The system for directly connecting photovoltaic power generation to a thermal power plant to supply electricity for coal mills according to claim 6, wherein the primary wind power heating device (46) and the busbar (46) for coal mills in the coal-fired power station 1) There is a switch (47) for the primary wind power heating device. 8. The system for directly connecting photovoltaic power generation to thermal power plants to supply electricity for coal mills according to claim 7, wherein the rated heating power of the primary wind power heating device (46) can increase the temperature of the primary wind to 400°C °C.

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