WO2022037139A1 - Cooling system for wind power generator - Google Patents

Abstract

Disclosed is a cooling system for a wind power generator. The cooling system uses a direct cooling manner, and comprises three stages of filtering devices and one stage of protective device; the filtering devices sequentially include, in an airflow direction, a rain separator, a coarse filter, and a medium-efficiency filter; and the protective device is mounted at an air outlet of a generator and is used for preventing airflow and rain from flowing backward.

Description

A wind turbine cooling system technical field

The present invention relates to the technical field of wind power, in particular to a cooling system for wind power generators.

Background technique

In recent years, with the continuous comprehensive and in-depth understanding of wind energy resources, key breakthroughs have been made in wind energy application science and technology, and economic comparative advantages have gradually become prominent. It is foreseeable that in the next few years, renewable and clean energy such as wind power will occupy the absolute dominant position in the increment of power development, and its proportion will be greatly increased. In this development process, scale can only be achieved through parity, and only by achieving large-scale development of the industry can it support the long-term comprehensive and large-scale development of related industries in the industrial chain. Therefore, reducing costs, de-subsidy, and grid parity is the key to wind power. The daunting task that the industry needs to shoulder.

Facing the pressure of "grid parity", the demand for high power of wind turbines is becoming more and more urgent. This will greatly increase the heat dissipation of various components in the generator. How to effectively solve the temperature rise bottleneck of the generator has become one of the key issues for the further development of wind turbines. Traditional wind turbines usually use air-to-air cooling. The air-to-air cooling includes internal circulation and external circulation. Air is used as a heat exchange medium. Externally circulated air. The cooling efficiency of the air-to-air cooling method is low, which greatly restricts the research and development of high-power wind turbines. In addition, the air-to-air cooling method requires a heat exchanger, and the material cost is high. The external circulation air path also needs to add an additional fan. The increase of the fan increases the failure rate of the cooling system, and the overall cooling system requires volume and mass in the cabin. Larger and more difficult to operate and maintain.

SUMMARY OF THE INVENTION

Aiming at some or all of the problems in the prior art, the present invention provides a wind turbine cooling system, which adopts a direct cooling method, and the system includes:

a direct cooling air duct for introducing air for cooling, the direct cooling air duct includes an air inlet and an air outlet;

A filter device, arranged in the direct cooling air duct, is used to purify the air flow entering the generator, including filtering rainwater, dust, salt mist particles and other particulate matter.

In the present invention, the terms "direct cooling" and "direct cooling" mean that the air in the environment directly enters the device to be cooled and directly participates in cooling, without auxiliary cooling devices such as heat exchangers. The term "air duct" refers to the passage of air or other cooling fluid within a cooling system, which may for example be made of metal or other thermally conductive or non-conductive material, or which may be formed by voids between corresponding components of the cooling system constituted as long as the voids can ensure the correct flow path of the cooling fluid. In the case of the direct cooling air duct, a filter device is arranged near the entrance of the direct cooling air duct to filter the air, the filtered air then enters the cooling system to cool the cooling device, and finally, the heated air passes through the cooling air duct. The outlet leaves the cooling system.

Further, the filtering device has the following sequence along the airflow direction:

Rainwater separator, installed at the air inlet of the direct cooling air duct, is used to filter water droplets and large particles in the air;

A coarse filter, installed after the rainwater separator along the airflow direction, for filtering small particles in the air; and

The medium-efficiency filter is installed after the coarse-efficiency filter along the airflow direction, and is used to filter tiny air particles.

Further, the wind turbine cooling system further includes a protection device, which is installed at the air outlet of the direct cooling air duct to prevent airflow and rainwater from backflowing.

Further, the large particles refer to particles above 15um.

Further, the medium and small particles refer to particles smaller than 15um and larger than 4um.

Further, the tiny particles refer to particles smaller than 4um and greater than or equal to 0.4um, and the tiny particles include salt spray particles.

Further, the rainwater separator includes a filter port and a rainwater collection portion, the filter port is installed at the air inlet, and the inlet of the rainwater collection portion is communicated with the filter port.

Further, the upper section of the rainwater collecting part is inclined downward, and the lower section is a detachable part.

Further, the protective device is a louver, the blades of the louver are installed at the air outlet in a high-inside and low-outside installation manner, and the blades droop at 45° to 60°.

The wind turbine cooling system provided by the invention adopts a direct cooling cooling method, the wind directly enters the generator, and the cooling efficiency is high, and three-stage filtration is used to purify the airflow entering the generator, so that the airflow does not contain harmful power generation. Use primary protection to prevent air flow or harmful particles from outside the engine room from entering the generator when the generator is not running, causing damage to the interior of the motor and its insulation. It has been verified that the cooling efficiency of the wind turbine cooling system provided by the present invention is improved by 20% compared with the existing air-to-air cooling cooler, and under the current generator configuration, the capacity can be increased by 20%, In addition, the material cost of the system is low, only 60% of that of the air-to-air cooler, and its weight and required space are small, and subsequent operation and maintenance and replacement of parts are more convenient, and can be widely used in offshore double-fed, squirrel cages and medium-speed permanent magnet generators.

Description of drawings

In order to further clarify the above and other advantages and features of the various embodiments of the present invention, a more specific description of the various embodiments of the present invention will be presented with reference to the accompanying drawings. It is understood that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings, the same or corresponding parts will be denoted by the same or similar numerals for clarity.

FIG. 1 shows a schematic structural diagram of a wind turbine cooling system according to an embodiment of the present invention.

detailed description

In the following description, the present invention is described with reference to various examples. However, one skilled in the art will recognize that the various embodiments may be practiced without one or more of the specific details or with other alternative and/or additional methods, materials or components. In other instances, well-known structures, materials, or operations are not shown or described in detail so as not to obscure the concepts of the present invention. Similarly, for purposes of explanation, specific quantities, materials and configurations are set forth in order to provide a thorough understanding of the embodiments of the invention. However, the invention is not limited to these specific details. Furthermore, it is to be understood that the various embodiments shown in the drawings are illustrative representations and have not necessarily been drawn to correct scale.

In this specification, reference to "one embodiment" or "the embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. The appearances of the phrase "in one embodiment" in various places in this specification are not necessarily all referring to the same embodiment.

It should be noted that the embodiments of the present invention describe the process steps in a specific order, but this is only to illustrate the specific embodiment, rather than limiting the sequence of the steps. On the contrary, in different embodiments of the present invention, the sequence of each step can be adjusted according to the adjustment of the process.

In order to improve the cooling efficiency of the wind power generator, the present invention provides a cooling system for the wind power generator, which adopts a direct cooling method. After the air passes through the filter device, the air directly enters the generator, and the cooling efficiency is high. The solution of the present invention will be further described below in conjunction with the accompanying drawings.

FIG. 1 shows a schematic structural diagram of a wind turbine cooling system according to an embodiment of the present invention. As shown in Figure 1, a wind turbine cooling system includes:

A direct cooling air duct, including an air inlet 001 and an air outlet 002, is used for introducing air for cooling, which acts as a flow channel for air or other cooling fluids in the cooling system. For example, the direct cooling air duct can be made of metal. or other thermally conductive or non-conductive materials, or may consist of voids between corresponding components of the cooling system, so long as the voids ensure proper flow paths for the cooling fluid; and

The filter device is installed at the air inlet 001 of the direct cooling air duct. The filter device is used to purify the airflow entering the generator, including blocking rainwater, dust, salt mist particles and other particles from entering the generator. In an embodiment of the present invention, the filtering device includes a tertiary filter, and the tertiary filter is a rainwater separator 111, a coarse filter 112 and a medium efficiency filter 113 in sequence along the airflow direction, wherein:

The rainwater separator 111 is installed at the air inlet of the direct cooling air duct, and is used to filter water droplets and large particles in the air. In an embodiment of the present invention, the large particles refer to particles with a diameter of more than 15um . In an embodiment of the present invention, the rainwater separator 111 includes a filter port 1111 and a rainwater collection portion 1112, the filter port is installed at the air inlet, and the inlet of the rainwater collection portion communicates with the filter port , after the air carries rainwater through the filter port, the rainwater flows into the rainwater collection part. In order to make the rainwater flow smoothly, the upper section of the rainwater collection part is designed to have a downwardly inclined angle. At the same time, in order to facilitate cleaning, the The lower section of the rainwater collection part is a detachable part;

The coarse filter 112 is installed after the rainwater separator 111 along the airflow direction, and is used to filter small particles in the air; particles; in one embodiment of the present invention, the coarse filter adopts G series filter cotton, such as G4 filter cotton; and

The medium-efficiency filter 113 is installed after the coarse-efficiency filter 112 along the air flow direction, and is used to filter fine air particles; in an embodiment of the present invention, the fine particles refer to a diameter of less than 4um and greater than or equal to 0.4um particles, the tiny particles include salt spray particles; in an embodiment of the present invention, the coarse filter adopts F series filter cotton, such as F9 filter cotton.

In an embodiment of the present invention, the wind turbine cooling system further includes a protection device 102, which is installed at the air outlet 002 of the direct cooling air duct. When the generator stops running, the protection device 102 can prevent the engine room from running. The air flow and rainwater from the outside will flow back into the generator, causing damage to the interior of the motor and its insulation. In an embodiment of the present invention, the protective device 102 is a shutter, and the blades of the shutter are installed at the air outlet in a high-inside and low-outside installation manner, and the blades hang down at 45° to 60°.

While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to those skilled in the relevant art that various combinations, modifications and changes can be made therein without departing from the spirit and scope of the present invention. Therefore, the breadth and scope of the invention disclosed herein should not be limited by the above-disclosed exemplary embodiments, but should be defined only in accordance with the appended claims and their equivalents.

Claims (10)

A cooling system for wind turbines, comprising: a direct cooling air duct configured to introduce air for cooling, the direct cooling air duct including an air inlet and an air outlet; and The filter device is arranged in the direct cooling air duct, and the filter device is configured to be capable of filtering water droplets and particulate matter in the air. The wind turbine cooling system according to claim 1, wherein the filtering device sequentially comprises: a rainwater separator, installed at the air inlet of the direct cooling air duct, the rainwater separator is configured to be able to filter water droplets and large particles in the air; a coarse filter, installed after the rainwater separator along the airflow direction, the coarse filter is configured to be able to filter small particles in the air; and The medium-efficiency filter is installed after the coarse-efficiency filter along the airflow direction, and the medium-efficiency filter is configured to be able to filter fine air particles. The wind turbine cooling system according to claim 1, further comprising a protection device installed at the air outlet of the direct cooling air duct, the protection device being configured to prevent airflow and rainwater from flowing backward. The wind turbine cooling system according to claim 2, wherein the large particles are particles with a diameter greater than 15um. The wind turbine cooling system according to claim 2, wherein the medium and small particles are particles with a diameter of less than 15um and greater than 4um. The wind turbine cooling system according to claim 2, wherein the fine particles are particles with a diameter of less than 4um and greater than or equal to 0.4um, and the fine particles include salt mist particles. The wind turbine cooling system according to claim 2, wherein the rainwater separator comprises a filter port and a rainwater collection portion, wherein the filter port is installed at the air inlet, and the rainwater collection portion has a The inlet communicates with the filter port. The wind turbine cooling system according to claim 7, wherein the upper section of the rainwater collecting part is inclined downward, and the lower section is a detachable part. The wind turbine cooling system according to claim 2, wherein the coarse-efficiency filter is a G-series filter cotton and/or the medium-efficiency filter is an F-series filter cotton. The wind turbine cooling system according to claim 3, wherein the protective device is a louver, the blades of the louver are installed at the air outlet in a high-inside and low-outside installation, and the blades are at a 45° angle. to 60° sag.

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