CN202645870U - Compressed air energy storage type wind generating system - Google Patents

Abstract

The utility model discloses a compressed air energy storage type wind power generation system, which comprises a fan arranged in a wind farm, an air compressor, an air storage tank, a decompression tank, a pneumatic generator set and a control device. The air compressor is connected to the air storage tank, the air storage tank is connected to the decompression tank, and the decompression tank is connected to the air input port of the pneumatic generator set; the input end of the control device is connected to the pressure sensor, and the output of the control device connected to the control valve. The utility model has a simple structure, can output stable and continuous electric energy without the participation of thermal power units in frequency regulation, reduces the pressure on the power grid, and smoothly solves the problem of wind power grid connection.

Description

Compressed air energy storage wind power generation system

technical field

The utility model relates to a wind power generating device using wind energy, in particular to a device for regenerating electric energy converted from wind energy by using compressed air.

Background technique

Wind power is one of the fastest growing technologies in the field of new and renewable energy. Wind power generation is a new energy power generation project that uses fans to obtain kinetic energy under the blowing of natural wind, and then converts it into the mechanical energy of the wind wheel, and then drives the generator to generate electricity through the gearbox. The electric energy obtained by the wind farm from the generator is rectified and inverted and then connected to the grid to provide electric energy for users. However, due to the sudden and changeable characteristics of the wind speed and wind direction of the natural wind, it has a great impact on wind power generation, not only in the impact on the speed-up box, generator and other equipment in the wind power generation system, causing damage to the equipment, The most important thing is the instability of its wind power output. Due to the unstable wind power output of the wind power generation system in the wind farm, thermal power units must be used to greatly participate in the frequency regulation of the wind power generation system during normal operation, and thermal power units are slow to adjust, making it difficult to adapt to large and rapid changes in wind power . With the rapid growth of wind power generation, the range of sudden changes in wind power will continue to increase, which will have a greater impact on the frequency quality of the power grid. The problem of wind power grid integration has become the biggest bottleneck in the development of wind power.

Utility model content

The technical problem to be solved by the utility model is to provide an energy storage type wind power generation system, which can solve the instability problem of the output power of the wind power generation system, so that the power output by the wind power generation can be supplied to the grid steadily and continuously, so that the wind power can be connected to the grid problem is solved.

In order to solve the problems of the technologies described above, the technical scheme adopted by the utility model is as follows.

A compressed air energy storage wind power generation system includes a fan installed in a wind farm, an air compressor, an air storage tank, a decompression tank, a pneumatic generator set, and a control device. The output end of the fan is connected to the air compressor, and the air The compressed air output end of the compressor communicates with the air storage tank through the pipeline, the output end of the air storage tank communicates with the decompression tank through the control valve, and the output end of the decompression tank communicates with the air input port of the pneumatic generator set through the connecting pipe; The input end of the control device is respectively connected with the pressure sensors arranged in the gas storage tank, the decompression tank and the pneumatic generator set, and the output end of the control device is connected with the control valve.

The specific structure of the pneumatic generator set in the utility model is as follows: the pneumatic generator set includes multi-stage pneumatic motors, and the output ends of each stage of pneumatic motors are respectively connected to a generator through a coupling.

The improvement of the utility model lies in that adjacent air motors are connected through connecting pipes, and the pipe diameter of the connecting pipes increases gradually from the first stage air motor to the last stage air motor.

A further improvement of the utility model is that: a heat exchanger is also arranged between the decompression tank and the pneumatic generator set.

Owing to adopting above-mentioned technical scheme, the technical progress that the utility model obtains is as follows.

The utility model has a simple structure, can output stable and continuous electric energy without the participation of thermal power units in frequency regulation, reduces the pressure on the power grid, and smoothly solves the problem of wind power grid connection. The air compressor provided by the utility model can convert the mechanical energy output by the fan into air compression energy. Since the energy impact caused by the changeable and sudden changes of the natural wind is absorbed by the compressed air, it will not affect the pneumatic engine in the wind power generation system. And generator produces impact, has improved safety and reliability of the present utility model, prolongs the life-span of the present utility model.

The pipe diameters of the connecting pipes in the pneumatic generator set of the utility model are set in a sequentially increasing manner to achieve the effect of stabilizing the air pressure, so that the pressure of the gas discharged into the atmosphere by the last-stage pneumatic engine is slightly higher than the atmospheric pressure, greatly improving the utilization efficiency of compressed air . Since the temperature of the high-pressure gas is greatly reduced after decompression, it will form a large temperature difference with the ambient temperature. The utility model supplies heat to the low-temperature gas from the environment through the heat exchanger provided. According to the law of thermodynamics, the temperature and pressure of the gas will be As the temperature rises, the energy increases, and finally the air motor outputs more mechanical energy to improve the efficiency of the unit.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Among them, 1. fan, 2. air compressor, 3. air storage tank, 4. decompression tank, 5. pneumatic generator set, 51. air motor, 52. generator, 6. control device, 7. control valve, 8. Heat exchanger.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

A compressed air energy storage wind power generation system, the structure of which is shown in Figure 1. It includes a fan 1 , an air compressor 2 , an air storage tank 3 , a control valve 7 , a decompression tank 4 , a heat exchanger 8 , a pneumatic generator set 5 and a control device 6 arranged in a wind farm. The pneumatic generator set 5 includes a multistage pneumatic motor 51, and the output end of each stage of the pneumatic motor is respectively connected to a generator through a coupling; engine and second stage air motor.

The output end of the fan is connected to the air compressor through the transmission line, and the unstable electric energy output by the wind generator is converted into the power source of the air compressor, which is used to compress the air output from the air compressor. The compressed air output end of the air compressor communicates with the air storage tank through the pipeline, the output end of the air storage tank communicates with the decompression tank through the control valve, the output end of the decompression tank communicates with the heat exchanger through the pipeline, and the output of the heat exchanger The air end of the first-stage air motor communicates with the air input port of the first-stage air motor through the connecting pipe I, the air output port of the first-stage air motor communicates with the air input port of the second-stage air motor through the connecting pipe II, and the air output port of the second-stage air motor The port directly discharges the waste into the atmosphere; the diameter of the connecting pipe I in this embodiment is smaller than that of the connecting pipe II. The power output shafts of the first-stage air motor and the second-stage air motor are respectively connected with a generator through couplings.

Pressure sensors are installed in the gas storage tank, decompression tank, and pneumatic generator set, and the output terminals of the pressure sensors are connected to the control device for collecting the pressure in the gas storage tank, the pressure in the decompression tank, and the pressure of the pneumatic generator set. The pressure in the connecting pipe is transmitted to the control device. The output end of the control device is connected to the control valve, which is used to adjust the opening of the control valve according to the collected pressure values, and the compressed air output from the air storage tank is delivered to the pneumatic generator set at a constant pressure value through the decompression tank to generate electricity. In order to ensure that the electric energy output by the pneumatic generator set is constant and continuous.

The gas storage tank is a composite gas tank, the inner tank of the gas storage tank is made of thin-walled aluminum alloy, and the outer wall of the gas storage tank is wound with high-strength carbon fiber, so that the gas storage tank has the characteristics of light weight, high pressure resistance, safety and durability. The pressure can be greater than 50MPa.

The working principle of the present utility model is as follows.

The fan is used to convert the natural wind energy into mechanical energy driven by the natural wind, and the mechanical energy is converted into unstable output electric energy, which is supplied to the air compressor through the transmission line. The air input end of the air compressor directly inhales air from the atmosphere and compresses the air under the action of the mechanical energy transmitted by the fan. The compressed air output end of the air compressor outputs the compressed air to the air storage tank through the pipeline, so that the compressed air is stored in the storage tank. in the gas tank. The pressure sensor in the gas storage tank monitors the pressure in the gas storage tank in real time, and transmits the pressure value to the control device.

The control device judges whether it can meet the normal operation of the pneumatic generator set according to the pressure value collected from the air storage tank. The output value regulates the opening of the control valve. After the control valve is opened, the compressed air copper drum pipe enters the decompression tank for decompression, and the decompression tank decompresses the compressed air according to the pressure value set by the control device, and then sends it to the air input port of the first-stage air motor through the connecting pipe I , the first-stage pneumatic motor does work under the action of air, and drives the generator to generate electricity.

The air output port of the first-stage air motor sends excess air to the air input port of the second-stage air motor through the connecting pipe II, and the second-stage air motor does work under the action of air, driving the generator connected to it to generate electricity . The air output port of the second stage air motor expels waste directly into the atmosphere.

After decompression, the temperature of the high-pressure gas is greatly reduced, and a large temperature difference will be formed with the ambient temperature, which reduces the utilization of the thermal efficiency of the utility model. In this embodiment, a heat exchanger is arranged between the decompression tank and the pneumatic generator set, which is used to supplement the low temperature gas from the environment. According to the law of thermodynamics, the temperature and pressure of the gas will increase, and the energy will increase, which will eventually make the air engine output more mechanical energy and improve the power generation efficiency.

Claims (4)

1. Caes formula wind-power generating system, comprise the blower fan (1) that is arranged in the wind energy turbine set, it is characterized in that: also comprise air compressor (2), gas holder (3), decompression tank (4), Pneumatic electric generating unit (5) and control gear (6), the output terminal of described blower fan (1) is connected with air compressor (2), the pressurized air output terminal of air compressor (2) is communicated with gas holder (3) by pipeline, the output terminal of gas holder (3) is communicated with decompression tank (4) by control valve (7), and the output terminal of decompression tank (4) is communicated with by the air input port of connecting tube with Pneumatic electric generating unit (5); The input end of described control gear (6) respectively be arranged on gas holder in, the decompression pressure transducer of being connected with the Pneumatic electric generating unit in the tank is connected, the output terminal of control gear is connected with control valve.

2. Caes formula wind-power generating system according to claim 1, it is characterized in that: described Pneumatic electric generating unit (5) comprises stage pneumatic motor (51), and the output terminal of described every grade of air motor (51) connects a generator (52) by coupling respectively.

3. Caes formula wind-power generating system according to claim 2 is characterized in that: all be communicated with by connecting tube between the adjacent air motor, the caliber of described connecting tube increases progressively from first order air motor to afterbody air motor.

4. Caes formula wind-power generating system according to claim 1 is characterized in that: also be provided with heat exchanger (8) between described decompression tank (4) and the Pneumatic electric generating unit (5).

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