阅读说明：本技术 一种带机械储能的风能驱动热电联产系统及方法 (Wind-driven cogeneration system and method with mechanical energy storage function ) 是由 王康 陈可仁 范子超 程婉静 孙财新 张霄 闫立春 于 2020-06-17 设计创作，主要内容包括：本发明公开了一种带机械储能的风能驱动热电联产系统及方法,本系统包括风机,风机通过传动带连接机械储能装置,机械储能装置带有传动轴,传动轴上同轴设置有联轴器一、发电机、联轴器二及双级压缩机；机械储能装置通过联轴器一驱动发电机工作,机械储能装置通过联轴器二驱动双级压缩机工作,双级压缩机连接供热系统部分。本方法为：通过调速联轴器将发电机和双级压缩机连接在同一个传动轴上,实现热电联产功能,满足多种用能场景；并且,本发明在供热部分通过两级压缩、中间冷却来降低压缩机的能耗,提高系统效率,使得系统在制取高温热量时也有较高的经济性。(The invention discloses a wind energy driven cogeneration system with mechanical energy storage and a method thereof, wherein the system comprises a fan, the fan is connected with a mechanical energy storage device through a transmission belt, the mechanical energy storage device is provided with a transmission shaft, and a first coupling, a generator, a second coupling and a two-stage compressor are coaxially arranged on the transmission shaft; the mechanical energy storage device drives the generator to work through the first coupler, the mechanical energy storage device drives the two-stage compressor to work through the second coupler, and the two-stage compressor is connected with the heat supply system. The method comprises the following steps: the generator and the two-stage compressor are connected to the same transmission shaft through the speed regulation coupler, so that the cogeneration function is realized, and various energy utilization scenes are met; in addition, the invention reduces the energy consumption of the compressor by two-stage compression and intermediate cooling in the heat supply part, improves the system efficiency and ensures that the system has higher economy when high-temperature heat is prepared.)

1. The utility model provides a take wind energy drive combined heat and power generation system of mechanical energy storage, includes fan (1), its characterized in that: the fan is characterized by further comprising a transmission belt (2), a mechanical energy storage device (3) and an evaporator (11), wherein the fan (1) is connected with the mechanical energy storage device (3) through the transmission belt (2), the mechanical energy storage device (3) is provided with a transmission shaft (6), and a first coupling (4), a generator (5), a second coupling (7) and a two-stage compressor are coaxially arranged on the transmission shaft (6);

the mechanical energy storage device (3) drives the generator (5) to work through the first coupler (4), and the mechanical energy storage device (3) drives the two-stage compressor to work through the second coupler (7);

the double-stage compressor consists of a first-stage compressor (8) and a second-stage compressor (9), wherein the first-stage compressor (8) is communicated with an evaporator (11) through a first pipeline (17), the first-stage compressor (8) is also communicated with a heat exchanger (15) through a second pipeline (18), and the heat exchanger (15) is communicated with the second-stage compressor (9) through a third pipeline (19); second grade compressor (9) are through No. four pipeline (20) intercommunication condenser (12), condenser (12) intercommunication condensation pipeline (21), and condensation pipeline (21) form two branches, are No. five pipeline (22), No. six pipeline (23) respectively, and No. five pipeline (22) are linked together with heat exchanger (15), and No. six pipeline (23) also are linked together with heat exchanger (15), and are provided with bypass control valve (14) on No. six pipeline (23), evaporimeter (11) are refluxed to heat exchanger (15) through No. eight pipeline (24).

2. The wind-driven cogeneration system with mechanical storage of energy of claim 1, wherein: and the sixth pipeline (23) is also provided with a regulating valve T (13), and the regulating valve T (13) is positioned between the condensing pipeline (23) and the bypass regulating valve (14).

3. The wind driven combined heat and power system with mechanical energy storage of claim 2, wherein: and a heat exchange throttle valve (16) is arranged on the No. eight pipeline (24).

4. The wind-driven cogeneration system with mechanical storage of energy of claim 3, wherein: and the first coupler (4) and the second coupler (7) both adopt speed-regulating couplers.

5. The wind driven combined heat and power system with mechanical energy storage according to any of claims 2-4, characterized by: the system comprises three working modes which are respectively as follows: the energy storage mode, the power generation mode and the heating mode, wherein the power generation mode and the heating mode work simultaneously or respectively.

6. The wind-driven cogeneration system with mechanical storage of energy of claim 5, wherein: the specific working process of the energy storage mode is as follows: the fan (1) converts wind energy into mechanical energy, the mechanical energy is transmitted to the mechanical energy storage device (3) through the transmission belt (2), and the mechanical energy storage device (3) stores the mechanical energy.

7. The wind-driven cogeneration system with mechanical storage of energy of claim 6, wherein: the specific working process of the power generation mode is as follows: the mechanical energy storage device (3) is started, the first coupler (4) is adjusted according to power generation requirements, the mechanical energy storage device (3) drives the power generator (5) to rotate through the transmission shaft (6), and power generation is achieved through the power generator (5).

8. The wind driven combined heat and power system with mechanical energy storage of claim 7, wherein: the specific working process of the heating mode is as follows: starting the mechanical energy storage device (3), adjusting the second coupler (7) and the adjusting valve T (13) according to heating requirements, starting the two-stage compressor, enabling the low-temperature and low-pressure gaseous heating working medium S1 to enter the first-stage compressor (8) and be compressed into a high-temperature and medium-pressure gaseous heating working medium S2, and enabling the gaseous heating working medium S2 to enter the heat exchanger (15) for cooling to become a medium-temperature and medium-pressure gaseous heating working medium S3; then, the gas-state heating working medium S4 is further compressed into a high-temperature and high-pressure gas-state heating working medium in a secondary compressor (9), the gas-state heating working medium S4 enters a condenser (12) to be cooled into a saturated liquid state and releases heat, and the released heat is used for heating;

the saturated liquid heating working medium is divided into two strands, one strand is gaseous heating working medium S5, and the other strand is gaseous heating working medium S6; the gaseous heating working medium S6 flows into a No. six pipeline (23), the pressure is reduced by the bypass throttle valve (14) to be reduced to be medium-pressure low-temperature liquid heating working medium S7, then the gaseous heating working medium S3 is mixed and exchanged with the gaseous heating working medium S2 to become gaseous heating working medium S3, and the gaseous heating working medium S3 continuously enters the secondary compressor (9) to carry out subsequent operation; the gaseous heating working medium S5 directly enters the heat exchanger (15) after flowing into the No. five pipeline (22), the gaseous heating working medium S5 entering the heat exchanger (15) sequentially passes through the heat exchanger (15) and the heat exchange throttle valve (16) and then becomes a low-temperature low-pressure liquid heating working medium S8, the liquid heating working medium S8 enters the evaporator (11) to absorb the heat of air or underground water (10) and then becomes a low-pressure low-temperature saturated gaseous heating working medium S1, and then circulation is resumed.

Technical Field

The invention relates to a cogeneration system and a method, in particular to a wind-driven cogeneration system with mechanical energy storage and a working method of the system.

Background

Wind power plays an important role in energy supply in China, and a wind power generation system has the characteristics of intermittency, volatility and aperiodicity because the wind power takes natural wind as motive power. The instability of natural wind can affect the stability and the electric energy quality of a power grid, and a series of technical problems of unbalanced system energy supply, fluctuation and flicker of voltage, deviation of system frequency and the like are caused.

Meanwhile, the winter heating areas in China mainly comprise Heilongjiang, Jilin, Liaoning, Xinjiang, Qinghai, Gansu, Ningxia, inner Mongolia, Hebei, Shanxi, Beijing, Tianjin, the northern part of Shanxi, the northern part of Shandong, the northern part of Henan and the like, and the total urban building area of the areas is about 90 hundred million square meters. Along with the urbanization process and the increase speed of urban population, the urban heating demand is rapidly increased, and China has a large gap in centralized heating. In the existing heating system, only a cold quantity/heat quantity output function is provided, and an electric power output function is lacked, so that the system cannot adapt to the application scene of cogeneration, and in addition, when high-temperature heat is prepared, the system efficiency is low, and the economy is poor.

The heating areas in winter mostly belong to areas with rich or richer wind energy resources, so that the wind energy heating system with energy storage is urgently needed to be provided, the instability problem of wind power grid connection can be avoided, cogeneration is also realized, the energy conversion loss in the middle conversion process is effectively reduced, and the wind energy utilization efficiency is improved.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a wind energy driven cogeneration system with mechanical energy storage and a method thereof.

In order to solve the technical problems, the invention adopts the technical scheme that: a wind energy driven cogeneration system with mechanical energy storage comprises a fan, a transmission belt, a mechanical energy storage device and an evaporator, wherein the fan is connected with the mechanical energy storage device through the transmission belt;

the mechanical energy storage device drives the generator to work through the first coupler, and the mechanical energy storage device drives the two-stage compressor to work through the second coupler;

the two-stage compressor consists of a first-stage compressor and a second-stage compressor, the first-stage compressor is communicated with the evaporator through a first pipeline, the first-stage compressor is also communicated with the heat exchanger through a second pipeline, and the heat exchanger is communicated with the second-stage compressor through a third pipeline; the secondary compressor is communicated with the condenser through a fourth pipeline, the condenser is communicated with the condensing pipeline, the condensing pipeline forms two branches, namely a fifth pipeline and a sixth pipeline, the fifth pipeline is communicated with the heat exchanger, the sixth pipeline is also communicated with the heat exchanger, a bypass adjusting valve is arranged on the sixth pipeline, and the heat exchanger flows back to the evaporator through an eighth pipeline.

Furthermore, the sixth pipeline is also provided with a regulating valve T, and the regulating valve T is positioned between the condensation pipeline and the bypass regulating valve.

Furthermore, a heat exchange throttle valve is arranged on the eighth pipeline.

Furthermore, the first coupler and the second coupler both adopt speed-regulating couplers.

Further, the system comprises three working modes, which are respectively as follows: the energy storage mode, the power generation mode and the heating mode, wherein the power generation mode and the heating mode work simultaneously or respectively.

Further, the specific working process of the energy storage mode is as follows: the fan converts wind energy into mechanical energy, and transmits the mechanical energy to the mechanical energy storage device through the transmission belt, and the mechanical energy storage device stores the mechanical energy.

Further, the specific working process of the power generation mode is as follows: and starting the mechanical energy storage device, adjusting the first coupler according to the power generation requirement, driving the generator to rotate by the mechanical energy storage device through the transmission shaft, and realizing power generation by the generator.

Further, the specific working process of the heating mode is as follows: starting a mechanical energy storage device, adjusting the second coupler and the adjusting valve T according to heating requirements, starting a two-stage compressor, enabling a low-temperature and low-pressure gaseous heating working medium S1 to enter a first-stage compressor to be compressed into a high-temperature and medium-pressure gaseous heating working medium S2, and enabling a gaseous heating working medium S2 to enter a heat exchanger for cooling to become a medium-temperature and medium-pressure gaseous heating working medium S3; then, the gas-state heating working medium S4 enters a secondary compressor and is further compressed into a high-temperature and high-pressure gas-state heating working medium S4, the gas-state heating working medium S4 enters a condenser to be cooled into a saturated liquid state and releases heat, and the released heat is used for heating;

the saturated liquid heating working medium is divided into two strands, one strand is gaseous heating working medium S5, and the other strand is gaseous heating working medium S6; the gaseous heating working medium S6 flows into a No. six pipeline, is decompressed and cooled to be a medium-pressure low-temperature liquid heating working medium S7 by a bypass throttle valve, then enters a heat exchanger to be mixed with the gaseous heating working medium S2 for heat exchange to become a gaseous heating working medium S3, and the gaseous heating working medium S3 continues to enter a secondary compressor for subsequent operation; after the gaseous heating working medium S5 flows into the fifth pipeline, the gaseous heating working medium S5 directly enters the heat exchanger, the gaseous heating working medium S5 entering the heat exchanger sequentially passes through the heat exchanger and the heat exchange throttle valve to be changed into a low-temperature low-pressure liquid heating working medium S8, the liquid heating working medium S8 enters the evaporator to absorb the heat of air or underground water to be changed into a low-pressure low-temperature saturated gaseous heating working medium S1, and then circulation is repeated.

The invention discloses a wind energy driven cogeneration system and a wind energy driven cogeneration method with mechanical energy storage.A generator and a two-stage compressor are connected to the same transmission shaft through a speed regulation coupler, so that the cogeneration function is realized, and various energy utilization scenes are met; in addition, the invention reduces the energy consumption of the compressor by two-stage compression and intermediate cooling in the heat supply part, improves the system efficiency and ensures that the system has higher economy when high-temperature heat is prepared.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention.

In the figure: 1. a fan; 2. a transmission belt; 3. a mechanical energy storage device; 4. a first coupler; 5. a generator; 6. a drive shaft; 7. a second coupler; 8. a first stage compressor; 9. a secondary compressor; 10. air or ground water; 11. an evaporator; 12. a condenser; 13. adjusting a valve T; 14. a bypass throttle valve; 15. a heat exchanger; 16. a heat exchange throttle valve; 17. a first pipeline; 18. a second pipeline; 19. a third pipeline; 20. a fourth pipeline; 21. a condensing pipeline; 22. a fifth pipeline; 23. a sixth pipeline; 24. pipeline number eight.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

A wind energy driven cogeneration system with mechanical energy storage is disclosed, which utilizes a mechanical energy storage device to store mechanical energy converted from wind energy, and drives a generator and a two-stage compressor to work through the mechanical energy storage device, so as to respectively realize power generation and heating functions and achieve the purpose of cogeneration.

The wind energy driven cogeneration system with mechanical energy storage is shown in figure 1, and comprises a fan 1, a transmission belt 2, a mechanical energy storage device 3 and an evaporator 11; the fan 1 is connected with a mechanical energy storage device 3 through a transmission belt 2, a transmission shaft 6 is arranged on the mechanical energy storage device 3, a first coupling 4, a generator 5, a second coupling 7 and a two-stage compressor are coaxially arranged on the transmission shaft 6, the mechanical energy storage device 3 is connected with the generator 5 through the first coupling 4 to realize power generation, and the two-stage compressor is connected with a heat supply system part of the system to realize heating;

the specific setting of this system is: the natural wind blows the fan 1, the fan 1 converts a large amount of wind energy into mechanical energy, and the fan 1 is connected with the mechanical energy storage device 3 through the transmission belt 2, so that the mechanical energy is transmitted into the mechanical energy storage device 3 through the transmission belt 2 and is stored, and the mechanical energy storage device 3 is adopted for storing energy, so that on one hand, adverse effects caused by instability of the natural wind are overcome, and on the other hand, energy waste is avoided;

the mechanical energy storage device 3 adopts mechanical energy storage equipment such as a flywheel energy storage machine, a compressed air energy storage machine and the like, is provided with a transmission shaft 6, and can drive a generator 5 and a two-stage compressor arranged on the transmission shaft to work;

the mechanical energy storage device 3 drives the generator 5 to work through the first coupling 4, and the first coupling 4 adopts a speed regulation coupling, so that the purpose of regulating the rotating speed and the output power of the engine can be realized according to the requirement of generating capacity; when power needs to be supplied, the mechanical energy storage device 3 is started, the first coupler 4 is kept in an open state, the first coupler 4 is adjusted according to the requirement of generated energy, and the mechanical energy storage device 3 drives the generator 5 to rotate through the transmission shaft 6 to realize power generation; if the power supply is not needed, the first coupling 4 is closed, and the generator 5 can not work;

the mechanical energy storage device 3 drives the two-stage compressor to work through the second coupler 7; the two-stage compressor consists of a first-stage compressor 8 and a second-stage compressor 9, and the second coupling 7 also adopts a speed-regulating coupling; similarly, when heat supply is needed, the mechanical energy storage device 3 is started, the second coupling 7 is kept in an open state, the mechanical energy storage device 3 drives the two-stage compressor to work, and the two-stage compressor is matched with the heat supply system part to realize heat supply; if the heat supply is not needed, the second coupling 7 is closed, so that the two-stage compressor does not work;

for the first-stage compressor 8 and the second-stage compressor 9, the specific connection relationship between the first-stage compressor and the second-stage compressor and the heating system part is as follows: the primary compressor 8 is communicated with an evaporator 11 through a first pipeline 17, and the evaporator 11 provides a low-temperature and low-pressure gaseous heating working medium S1 for the primary compressor 8; after the heating working medium S1 is compressed into a high-temperature medium-pressure heating working medium S2 in the primary compressor 8, the primary compressor 8 is communicated with a heat exchanger 15 through a second pipeline 18, the heating working medium S2 is subjected to heat exchange to become a medium-temperature medium-pressure heating working medium S3, and then the medium-temperature medium-pressure heating working medium S3 is communicated with the secondary compressor 9 through a third pipeline 19 through the heat exchanger 15, so that the heating working medium S3 is compressed into a high-temperature high-pressure heating working medium S4 in the secondary compressor 9;

the high-temperature high-pressure heating working medium S4 is a heat source required by the condenser 12 for supplying heat, the secondary compressor 9 is communicated with the condenser 12 through a fourth pipeline 20, and the traditional high-temperature high-pressure heating working medium S4 is provided for the condenser 12; for a traditional heat supply system, a heating working medium is directly compressed into a high-temperature high-pressure heating working medium required by heat supply through a primary compressor, however, in the process that the gaseous heating working medium is changed from low temperature and low pressure into high temperature and high pressure, along with the continuous increase of temperature, gas expansion obstructs the compression process, the energy consumption of the primary compression mode is extremely high, and the heat supply effect of the high-temperature high-pressure heating working medium is difficult to ensure; therefore, the invention effectively solves the problem of high energy consumption of the compressor by adopting a two-stage compression and intercooling mode, and intercooling is realized by the heat exchanger 15, so that high economical efficiency is realized when high-temperature heat is prepared;

after heat exchange is carried out on the high-temperature and high-pressure heating working medium S4 by the condenser 12, the high-temperature and high-pressure heating working medium S4 is cooled into a saturated liquid heating working medium and releases heat, the released heat is used for supplying heat, and the saturated liquid heating working medium is divided into two parts after flowing through a condensation pipeline 21 communicated with the condenser 12; one S5 flows into a branch of the condensation pipeline 21, namely a fifth pipeline 22, and the other S6 flows into a branch of the condensation pipeline 21, namely a sixth pipeline 23;

the fifth pipeline 22 is directly communicated with the heat exchanger 15, so that the liquid heating working medium S5 directly flows into the heat exchanger 15 for heat exchange, the heat exchanger 15 returns to the evaporator 11 through the eighth pipeline 24, the eighth pipeline 24 is provided with the heat exchange throttle valve 16, the liquid heating working medium S5 sequentially passes through the heat exchanger 15 and the heat exchange throttle valve 16 and then is changed into the low-temperature and low-pressure liquid heating working medium S8, the S8 returns to the evaporator 11, the heat of the air or the underground water 10 entering the evaporator 11 is absorbed and is changed into the low-temperature and low-pressure gaseous heating working medium S1, and then the cycle is restarted;

the liquid heating working medium S6 flowing into the sixth pipeline 23 is decompressed and cooled to be the heating working medium S7 with medium pressure and low temperature under the action of a bypass regulating valve 14 arranged on the sixth pipeline 23, the heating working medium S7 then enters a heat exchanger 15 to be mixed with the heating working medium S2 for heat exchange to become the heating working medium S3, and then the circulation is repeated;

the six-stage pipeline 23 is provided with a regulating valve T13, a regulating valve T13 is positioned between the condensing pipeline 23 and the bypass regulating valve 14, and the flow ratio of the two heating working media S5 and S6 is regulated by a regulating valve T13, so that the flow ratio of S5 and S6 is optimized according to the working requirement of the two-stage compressor, the energy consumption of the compressor is further reduced, and the system achieves the best performance.

For the wind energy driven cogeneration system with mechanical energy storage disclosed by the invention, the working modes can be divided into three types, namely: the energy storage system comprises an energy storage mode, a power generation mode and a heating mode, wherein the power generation mode and the heating mode can work simultaneously or respectively so as to meet various energy requirements and application scenes.

The specific working process of the energy storage mode is as follows: the fan 1 converts wind energy into mechanical energy, transmits the mechanical energy to the mechanical energy storage device 3 through the transmission belt 2, and stores the mechanical energy in the mechanical energy storage device 3; the mechanical energy storage device 3 is used for storing energy, the defect of unstable wind power is overcome, and the stability of a circuit and heat output is guaranteed.

The specific working process of the power generation mode is as follows: and starting the mechanical energy storage device 3, adjusting the first coupler 4 according to the power generation requirement, driving the generator 5 to rotate by the mechanical energy storage device 3 through the transmission shaft 6, and realizing power generation by the generator 5.

The specific working process of the heating mode is as follows: starting the mechanical energy storage device 3, adjusting the second coupler 7 and the adjusting valve T13 according to the heating requirement, and realizing the adjustment of the heat supply quantity and the temperature of the double-stage compressor; starting the two-stage compressor, enabling a low-temperature low-pressure gaseous heating working medium S1 to enter the one-stage compressor 8 and be compressed into a high-temperature medium-pressure gaseous heating working medium S2, and enabling a gaseous heating working medium S2 to enter the heat exchanger 15 for cooling to become a medium-temperature medium-pressure gaseous heating working medium S3; then, the gas-state heating working medium S4 is further compressed into a high-temperature and high-pressure gas-state heating working medium S4 in the secondary compressor 9, the gas-state heating working medium S4 enters the condenser 12 to be cooled into a saturated liquid state and releases heat, and the released heat is used for heating;

the saturated liquid heating working medium is divided into two strands, one strand is gaseous heating working medium S5, and the other strand is gaseous heating working medium S6; the gaseous heating working medium S6 flows into a No. six pipeline 23, is decompressed and cooled to be a medium-pressure low-temperature liquid heating working medium S7 by the bypass throttle valve 14, then enters the heat exchanger 15 to be mixed with the gaseous heating working medium S2 for heat exchange to become a gaseous heating working medium S3, and the gaseous heating working medium S3 continues to enter the secondary compressor 9 for subsequent operation; the gaseous heating working medium S5 flows into the fifth pipeline 22 and then directly enters the heat exchanger 15, the gaseous heating working medium S5 entering the heat exchanger 15 passes through the heat exchanger 15 and the heat exchange throttle valve 16 in sequence and then becomes a low-temperature low-pressure liquid heating working medium S8, the liquid heating working medium S8 enters the evaporator 11 to absorb the heat of air or underground water 10 and then becomes a low-pressure low-temperature saturated gaseous heating working medium S1, and then the cycle is repeated.

Compared with the prior art, the wind energy driven cogeneration system with mechanical energy storage and the method thereof have the following beneficial effects:

1) the mechanical energy storage device is pure, the defect of unstable wind power is overcome, the instability of wind power grid connection is avoided, and the stability of circuit and heat output is guaranteed.

2) The generator set and the double-stage compressor are connected to the same transmission shaft through the speed regulation coupler, so that the combined output of electric power and heat can be regulated, and the requirements of multiple groups of energy consumption and application scenes are met.

3) The heat pump is directly driven by wind energy to heat, so that energy conversion loss in the middle conversion process can be effectively reduced, and the utilization efficiency of the wind energy is improved.

4) The compression type heating system is provided with two-stage compression and intermediate cooling processes, so that the temperature of a heating working medium in the compression process can be reduced, and the energy consumption of the compressor is reduced on the premise of keeping the compression ratio unchanged, thereby improving the heating efficiency of the system and ensuring that the system has higher economical efficiency when preparing high-temperature heat.

5) By arranging the bypass throttle valve, the energy consumption of the compressor can be minimized by adjusting the flow ratio of the two heating working media on the premise that the output heat of the condenser is not changed, and the system achieves the optimal performance coefficient.

The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make variations, modifications, additions or substitutions within the technical scope of the present invention.