CN201818442U - Heat exchange system of direct-drive wind generating set - Google Patents

Abstract

The invention relates to a heat exchange system of a direct-drive wind power generating set, which belongs to the technical field of wind power generating sets. It includes a heat exchanger, an internal circulation fan, an external circulation fan, and a cabin wall air duct placed on the inner wall of the cabin cover. The circulation fan is connected, and the external circulation fan is placed in the external circulation outlet channel of the heat exchanger. The air outlet of the external circulation outlet channel is sealed and connected to the air outlet of the cabin cover and communicated with the outside. Connect to the air outlet of the unit generator. The utility model realizes the heat exchange between the inner and outer circulating air without making them mix with each other. After the heat exchange, the temperature of the internal circulation air is lowered, and it is discharged into the cabin through the internal circulation outlet channel; the temperature of the external circulation air is raised through the heat exchange, and it is directly discharged into the outside of the cabin through the external circulation outlet channel. Effectively reduces the temperature in the cabin.

Description

Direct drive wind turbine heat exchange system

technical field

The invention belongs to the technical field of wind power generators, and in particular relates to a direct-drive wind power generator heat exchange system, which is suitable for offshore direct-drive wind power generators.

technical background

The direct-drive wind turbine cancels the speed-increasing gearbox with heavy weight and complex structure, and the number of parts is much less than that of the doubly-fed wind turbine, thereby improving the reliability and utilization of the wind turbine; at the same time, the direct-drive wind power The unit adopts full-power frequency conversion technology, which can significantly improve the power quality and reduce the impact on the power grid, and it is easier to realize the low-voltage ride-through function than the doubly-fed wind power generation unit, so as to meet the needs of the power grid for wind power grid integration. In view of the above significant advantages, related technologies of direct-drive wind turbines have developed rapidly in recent years. At present, 1.5MW, 2.5MW and other direct-drive wind turbines have been developed in China, and they are connected to the grid. However, the 3.0MW direct-drive wind turbine is still blank in China, and many host manufacturers are stepping up research and development.

For the wind power industry market, due to the high cost of offshore wind turbines, it has become an inevitable trend to increase the stand-alone capacity of wind turbines. The characteristics of high air humidity and high salt content in the marine climate have become one of the difficulties that need to be overcome. The fully sealed engine room is equipped with dehumidification and anti-salt spray system to ensure the normal operation of the components in the engine room during the design life. The sealed cabin brings serious difficulties to the heat dissipation of the whole machine.

Contents of the invention

In view of the above technical problems, the present invention provides a heat exchange system for a direct drive wind power generating set, which can reduce the temperature inside the nacelle. Suitable for offshore direct drive wind turbines.

In order to achieve the above object, the technical scheme of the present invention is as follows:

The invention includes a heat exchanger, an internal circulation fan, an external circulation fan and a cabin wall air duct placed on the inner wall of the cabin cover. It is connected with the internal circulation fan, and the external circulation fan is placed in the outer circulation outlet channel of the heat exchanger. The air outlet of the outer circulation outlet channel is sealed and connected to the air outlet of the cabin cover, and communicated with the outside. When working, the air channel of the cabin wall The air inlet is connected with the air outlet of the unit generator.

The air duct on the cabin wall is a fiberglass air duct, and its air outlet is connected to the inner circulation inlet channel through a corrugated pipe.

The present invention has the following advantages:

In the present invention, the heat exchanger is respectively connected with internal and external circulation fans, and the internal circulation fan is connected to the air outlet of the unit generator through the air channel of the cabin wall, and the external circulation fan is placed in the external circulation outlet channel communicating with the outside of the cabin, realizing Heat exchange between inner and outer circulating air without mixing them with each other. After the heat exchange, the temperature of the internal circulation air is lowered, and it is discharged into the cabin through the internal circulation outlet channel; the temperature of the external circulation air is raised through the heat exchange, and it is directly discharged into the outside of the cabin through the external circulation outlet channel. Effectively reduces the temperature in the cabin.

The cabin wall air duct in the present invention is a glass fiber reinforced plastic duct along the inner wall of the cabin, which has the following advantages: 1. saves the space inside the cabin and simplifies the structure; The life of the channel should be long, which can reach 20 years according to the design requirements, which greatly improves the reliability of the equipment; 3. The thermal conductivity of the glass fiber reinforced plastic material is low, only 1.25-1.67kJ/(m·h·K) at room temperature. The fiberglass air duct can effectively reduce the heat radiation of the hot air to the cabin during the transmission process, indirectly reducing the temperature inside the cabin.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the connection structure of the heat exchanger part in Fig. 1 .

FIG. 3 is a schematic diagram of the three-dimensional structure of the air duct of the cabin wall in FIG. 1 .

In the figure: 1. Air inlet, 2. Air duct of cabin wall, 3. Bellows, 4. Internal circulation inlet, 5. Air outlet, 6. Outer circulation outlet channel, 7. Internal circulation outlet channel, 8. Internal circulation fan , 9. Heat exchanger, 10. External circulation fan, 11. Base plate, 12. Nacelle cover.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Embodiment 1: as shown in Fig. 1, Fig. 2, Fig. 3, the present invention comprises heat exchanger 9, internal circulation blower fan 8, external circulation blower blower 10 and the cabin wall air channel 2 that is placed in the cabin cover 12 inner walls, and described heat The exchanger 9 is fixed in the nacelle cover 12 through the bottom plate 11, and its inner circulation inlet passage 4 is connected with the air outlet of the cabin wall air duct 2, and its inner circulation outlet passage 7 is connected with the inner circulation fan 8, and the outer circulation fan 10 is placed in the heat In the outer circulation outlet channel 6 of the exchanger 9, the air outlet 5 of the outer circulation outlet channel 6 is sealed and connected to the air outlet of the nacelle cover 12, and communicates with the outside. Air outlet connection.

As shown in Figure 1 and Figure 3, the cabin wall air duct 2 described in this example is a fiberglass air duct, and its air outlet is connected to the inner circulation inlet channel 4 through a bellows 3. In this example, two heat exchange systems of the present invention are installed in the nacelle cover 12, and the air-to-air heat exchange mode is used to transfer the heat generated by the generator to the external environment of the nacelle without mixing the air inside the nacelle with the outside air .

In this example, when the temperature of the generator reaches the upper critical value, the heat exchange system starts. The model of heat exchanger 9 is JHE0850-0900-040-2EDK-2-0-0-0900, the heat exchanger core is a hollow plate structure, and the spoiler on the plate can increase the effective heat dissipation area. The heat exchanger 9 is arranged at the rear of the nacelle, and its internal circulation inlet passage 4 communicates with the generator air outlet through the nacelle wall air duct 2 . As shown in Figure 2, during operation, the internal circulation fan 8 draws the hot air generated by the generator into the heat exchanger 9 through the internal circulation air duct, and at the same time, the external circulation fan 10 draws the natural air from the outside through the external circulation outlet channel 6. into the heat exchanger 9. Although the air of the internal and external circulation is collected in the heat exchanger 9, the difference is that the hot air of the internal circulation passes through the inner hollow part of the plates, while the cold air of the external circulation passes between the plates. The air passages that pass through and the inner and outer circulation are not connected to each other. In this way, the heat exchange between the inner and outer circulating air is realized without mixing them with each other. After the heat exchange, the temperature of the internal circulation air is lowered, and it is discharged into the cabin through the internal circulation outlet channel 7; the temperature of the external circulation air is raised through the heat exchange, and it is directly discharged into the outside of the cabin through the external circulation outlet channel 6.

The cabin wall air duct 2 described in this example is a glass fiber reinforced plastic air duct made directly on the two side walls of the cabin, and the inner circulation air duct communicates with the glass fiber reinforced plastic air duct through a bellows 3 . Through the overall structural arrangement of the heat exchange system in the engine room in this example, the hot air discharged from the generator passes through a short cycle, and its temperature can be reduced by up to 30°C, thus ensuring the normal operation of the fan at full load.

Claims (2)

1. A heat exchange system for a direct-drive wind power generating set, characterized in that: comprise a heat exchanger, an internal circulation fan, an external circulation fan and a cabin wall air duct placed on the cabin cover inwall, the internal circulation inlet of the heat exchanger The channel is connected to the air outlet of the air channel on the cabin wall, and the internal circulation outlet channel is connected to the internal circulation fan. At the air outlet, it communicates with the outside. When working, the air inlet of the air duct on the cabin wall is connected to the air outlet of the unit generator. 2. The heat exchange system of direct-drive wind power generating set according to claim 1, characterized in that: said cabin wall air duct is a glass fiber reinforced plastic air duct, and its air outlet is connected to the inner circulation inlet channel through a bellows.

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