CN108316978A - Household biogas cogeneration device - Google Patents

Abstract

The invention provides a domestic biogas cogeneration device, which includes: a first combustion chamber, a thermoacoustic engine and a two-way turbine power generation device; the first combustion chamber is used to burn combustible gas to obtain heat, and a The heat collection device is connected to the thermoacoustic engine through a thermal bridge, and the thermoacoustic engine is combined with the bidirectional turbine power generation device to form a thermoacoustic power generation device, and the thermoacoustic engine is in contact with the waterway at the same time. A domestic biogas cogeneration device provided by the present invention is equipped with a thermoacoustic power generation device using a bidirectional turbine to generate electricity, which has a simple structure, reliable operation, and low cost of the whole machine. At the same time, the waste heat of the thermoacoustic engine is utilized, and the thermal efficiency can be obtained. Further improvement, the scale of thermoacoustic power generation can be flexibly designed according to actual needs, suitable for small and medium-sized household systems.

Description

A domestic biogas cogeneration device

technical field

The invention relates to the technical field of new energy applications, and more specifically, to a domestic biogas cogeneration device.

Background technique

Renewable energy is an important energy source for sustainable development, and biogas power generation technology is a new technology for comprehensive utilization of energy that integrates environmental protection and energy saving. It uses a large amount of organic waste (such as feces, straw, urban garbage, sewage, etc.) in industry, agriculture or urban life to produce biogas through anaerobic fermentation, uses the biogas on the engine, and is equipped with a comprehensive power generation device. It is an important way to effectively use biogas to generate electricity and heat. At present, there are a huge number of domestic biogas users, and about 40% of the 200 million rural households use domestic biogas digesters. If the biogas can be processed and utilized, tens of billions of construction funds and tens of millions of tons of coal will be saved every year. At the same time, the use of renewable energy to generate electricity can also provide a strong guarantee for energy security and environmental protection.

At present, the biogas internal combustion engines used in biogas power generation are divided into two types, namely dual-fuel type and full-fired type. The dual-fuel type uses diesel and biogas as dual fuels, and ignites biogas to generate electricity by compressing and igniting a small amount of diesel. Its disadvantage is that the system is complicated, and it must have two sets of oil supply and gas supply devices at the same time, which greatly increases the cost, and is not suitable for decentralized farmers' biogas power generation. The full-burning type uses an ignition-type gasoline engine, which burns biogas, has low power and low efficiency, and its electronic speed control system also greatly increases the cost.

Chinese patent CN201215037X discloses a household biogas power generation device, as shown in Figure 1, it includes a gas mixing device 11, an internal combustion engine 12, a gas pressurized storage device, and a generator 13, the whole system is huge, the construction cost is high, and maintenance is difficult big. Chinese patent CN202883023U discloses a biogas power generation device, as shown in Figure 2, including a gas-water separator 21, a desulfurization tower 22, a water condenser 23, a pressurized gas storage tank 24, and a biogas power generation system 25. The entire system is highly complex , is not easy to operate, and is not suitable for small and medium-sized families. Chinese patent CN201778847U discloses a biogas power generation device, as shown in Figure 3, including a biogas digester, a pressurized gas storage tank, a steam turbine and a generator connected to the steam turbine, and the generator is connected to a transformer. The system is simple and easy to operate, but The steam turbine and its corresponding generator still have relatively high cost, and the thermal energy utilization rate of the system is still low.

Most of the existing biogas power generation devices have the problems of low utilization rate of heat energy, complex equipment, high cost and unsuitable for small and medium-sized households.

Contents of the invention

The present invention provides a domestic biogas cogeneration device that overcomes the problems of low thermal energy utilization rate, complex equipment, high cost and unsuitability for small and medium-sized households in most existing biogas power generation devices, or at least partially solves the above problems .

According to the present invention, a domestic biogas cogeneration device is provided, which includes: a first combustion chamber, a thermoacoustic engine and a two-way turbine power generation device; the first combustion chamber is used to burn combustible gas to obtain heat, and the A heat collection device is arranged inside the first combustion chamber, the heat collection device is connected to the thermoacoustic engine through a thermal bridge, the thermoacoustic engine is connected to the bidirectional turbine power generation device, and the two are combined to form a thermoacoustic power generation device, The thermoacoustic engine is in contact with the waterway at the same time.

On the basis of the above solution, a domestic biogas cogeneration device further includes: a second combustion chamber; the second combustion chamber is used to burn combustible gas, a heat exchange device is arranged in the second combustion chamber, The heat device is connected with the water circuit, and the water in the water circuit flows through the heat exchange device.

On the basis of the above scheme, a domestic biogas cogeneration device also includes: a purification device and a gas storage tank; one end of the purification device is connected to one end of a biogas suction pump, and the other end of the biogas suction pump is connected to a biogas source The other end of the purification device is connected to the gas storage tank through the gas pipeline, the gas storage tank is connected to the first combustion chamber through the first biogas regulating valve, and the gas storage tank is connected to the first combustion chamber through the second biogas The regulating valve is connected with the second combustion chamber, the first combustion chamber is connected with the first air regulating valve, and the second combustion chamber is connected with the second air regulating valve.

On the basis of the above solution, a household biogas cogeneration device also includes: a control device; The second biogas regulating valve, the first air regulating valve and the second air regulating valve are connected, and the electric energy storage is connected with the bidirectional turbine power generation device.

On the basis of the above solution, the gas storage tank is respectively connected to a pressure sensor and a gas detector, and the pressure sensor and the gas detector are respectively connected to the controller.

On the basis of the above solution, the heat dissipation paint is coated on the outer wall of the gas storage tank.

On the basis of the above solution, the diameter ratio of the gas pipeline to the gas storage tank is 1:5-1:8.

On the basis of the above scheme, the thermoacoustic engine includes at least one engine basic unit; any of the engine basic units is composed of a first connecting pipe, a main cooler, a regenerator, a hot end heat exchanger, a thermal buffer pipe, The secondary cooler is connected to the second connecting pipe in sequence, the hot end heat exchanger is connected to the heat bridge, and the first connecting pipe is connected to the second connecting pipe through a resonance pipe.

On the basis of the above scheme, a plurality of basic engine units are connected in series through a resonance tube to form a loop, and the two-way turbine power generation device is connected in series or bypassed in the loop, and the two-way turbine power generation device is placed near the secondary At the top position of the resonance tube of the cooler, a DC suppressor is arranged in the first connecting tube of an engine basic unit.

On the basis of the above scheme, the two-way turbine power generation device specifically includes: turbine moving blades, guide vanes, connecting shafts, fairings and rotary generators; Flow blades, the turbine moving blades are connected to the rotating shaft of the rotary generator through the connecting shaft, the rotary generator is arranged on one side or both sides of the turbine moving blades, the rectifier The shroud is used to rectify the inflow and outflow of gas, and the rotary generator is arranged inside or outside of the shroud.

A domestic biogas cogeneration device provided by the present invention adopts a thermoacoustic power generation device combined with a bidirectional turbine power generation device and a thermoacoustic engine. The structure is simple, the cost of the whole machine is low, and it is more reliable and economical than the previous system At the same time, the thermal efficiency can be further improved by utilizing the waste heat of the thermoacoustic engine, which has great advantages in the utilization of small and medium-sized houses; the whole system has simple structure, high thermal energy utilization rate, and the scale of thermoacoustic power generation can be flexible according to actual needs Design, its construction scale can be large or small, the construction cost is low, the cycle is short, and it is suitable for small and medium-sized household systems.

Description of drawings

Fig. 1 is the structural representation of a kind of domestic biogas power generation device in the prior art;

Fig. 2 is the structural representation of a kind of biogas generating device in the prior art;

Fig. 3 is a schematic structural view of a biogas power generation device in the prior art;

Fig. 4 is a schematic structural view of a domestic biogas cogeneration device according to an embodiment of the present invention;

Fig. 5 is a structural schematic diagram of a Wells turbine moving blade according to an embodiment of the present invention;

Fig. 6 is a schematic structural view of a bidirectional impingement turbine moving blade according to an embodiment of the present invention;

7 is a schematic structural view of a bidirectional impact turbine with guide vanes according to an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a thermoacoustic engine basic unit in a household biogas cogeneration device according to an embodiment of the present invention;

Fig. 9 is a schematic structural diagram of a bidirectional turbine power generation device in a domestic biogas cogeneration device according to an embodiment of the present invention;

Fig. 10 is a schematic structural diagram of a domestic biogas cogeneration device according to an embodiment of the present invention.

Explanation of reference signs:

12—internal combustion engine; 11—gas mixing device; 13—generator;

21—gas-water separator; 22—desulfurization tower; 23—condenser;

24—pressurized gas storage tank; 25—biogas power generation system; 31—control device;

33—purification device; 32—methane pump; 34—gas pipeline;

35—gas storage tank; 36—the first biogas regulating valve; 37—the second biogas regulating valve;

38—the first burner; 39—the first air regulating valve; 310—the second air regulating valve;

311—the second burner; 312—the first combustion chamber; 313—heat collecting device;

314—the first exhaust pipe; 315—the second combustion chamber; 316—the heat exchange device;

317—second exhaust pipe; 318—thermal bridge; 319—thermoacoustic engine;

320—DC suppressor; 321—two-way turbine generator; 322—resonant tube;

323—waterway; 101—controller; 102—electric energy storage;

501—pressure sensor; 502—gas detector; 211—turbine moving blade;

212—guide vane; 191—first connecting pipe; 192—main cooler;

193—regenerator; 194—hot end heat exchanger; 195—heat buffer tube;

196—secondary cooler; 197—second connecting pipe; 213—connecting shaft;

215—cowl; 214—rotary generator; 216—connecting pipeline.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

This embodiment provides a domestic biogas cogeneration device according to the present invention. With reference to FIG. To obtain heat by burning combustible gas, a heat collection device 313 is arranged inside the first combustion chamber 312, and the heat collection device 313 is connected to the thermoacoustic engine 319 through a thermal bridge 318, and the thermoacoustic engine 319 is connected to the thermoacoustic engine 319. The two-way turbine power generation device 321 is connected and combined to form a thermoacoustic power generation device, and the thermoacoustic engine 319 is in contact with the waterway 323 at the same time.

A domestic biogas cogeneration device provided in this embodiment includes a first combustion chamber 312 , a thermoacoustic engine 319 and a bidirectional turbine power generation device 321 . The first combustion chamber 312 is used for combustion of fuel. The heat collection device 313 is arranged inside the first combustion chamber 312, and can directly contact with the high-temperature flue gas of fuel combustion to obtain heat.

Specifically, a first burner 38 is arranged on the top of the first combustion chamber 312 , and related components required for fuel combustion are arranged in the first burner 38 . Fuel, namely combustible gas, enters the first burner 38 from the top of the first combustion chamber 312 for combustion.

The first combustion chamber 312 communicates with the first burner 38 , and the high-temperature flue gas generated by fuel combustion will gather in the first combustion chamber 312 . The inner cavity of the first combustion chamber 312 is used for setting the heat collecting device 313 . The installation of the first combustion chamber 312 facilitates the installation of the heat collection device 313, and allows the heat collection device 313 to fully exchange heat with the high-temperature flue gas as much as possible.

A thermal bridge 318 is provided between the heat collection device 313 and the thermoacoustic engine 319 . One end of the thermal bridge 318 is connected to the heat collecting device 313 , and the other end is connected to the thermoacoustic engine 319 . The heat bridge 318 transfers the heat obtained by the heat collection device 313 to the thermoacoustic engine 319 . The thermoacoustic engine 319 utilizes this heat to generate reciprocating aeromechanical energy.

A thermoacoustic engine 319 is combined with a bi-directional turbine generator 321 . The two-way turbine generator 321 can convert the reciprocating mechanical energy into a one-way rotary motion, thereby driving the rotary generator 214 to generate electricity.

Further, the thermoacoustic engine 319 is simultaneously connected to the waterway 323 . The waterway 323 is a pipeline whose inner medium is water. The waterway 323 flows through the thermoacoustic engine 319 and can absorb the waste heat of the thermoacoustic engine 319 through convective heat exchange to generate hot water for daily use.

Thermoacoustic engine 319, as a kind of external combustion engine, has a wide working temperature range (the onset temperature can be lower than 100°C), and it can form a thermoacoustic power generation system when combined with an acoustic-electric conversion device, which has great advantages in the utilization of low-grade heat sources. potential. Because the thermoacoustic engine 319 has few moving parts, high intrinsic efficiency, environment-friendly working medium, high stability and reliability, it has achieved rapid development in recent years.

The thermal energy generated by combustible gas combustion is used to drive the thermoacoustic engine 319 . The thermoacoustic engine 319 converts thermal energy into reciprocating gas mechanical energy, thereby driving the bidirectional turbine generator 321 to convert the reciprocating gas mechanical energy into electrical energy for output.

The thermoacoustic engine 319 and the two-way turbine power generation device 321 are used in combination to form a thermoacoustic power generation device, which has a simple structure, reliable operation, and low cost of the whole machine. Compared with the previous system, it is more economical and reliable.

At the same time, the waste heat of the thermoacoustic engine 319 can be recovered to heat domestic water, which improves the utilization rate of heat energy. The whole system has a simple structure, high utilization rate of thermal energy, and the scale of thermoacoustic power generation can be flexibly designed according to actual needs. The construction scale can be large or small, the construction cost is low, and the cycle is short. It is suitable for small and medium-sized household systems.

Further, the heat collection device 313 may be composed of multiple heat pipes. Since the heat pipe has better heat transfer performance, the use of the heat pipe can effectively improve the heat exchange efficiency of the heat collection device 313 and ensure the heat collection efficiency of the heat collection device 313 . In addition, the heat collection device 313 described in practical applications can also use other methods for heat transfer, such as high-temperature fluid heat transfer, etc. Specifically, appropriate heat transfer materials can be selected according to actual needs.

On the basis of the above-mentioned embodiments, further, a domestic biogas cogeneration device further includes: a second combustion chamber 315; the second combustion chamber 315 is used to burn combustible gas, and the A heat exchange device 316 is provided, and the heat exchange device 316 is connected to the water channel 323 , and the water in the water channel 323 flows through the heat exchange device 316 .

This embodiment is based on the above embodiments, and a second combustion chamber 315 is added. The second combustion chamber 315 is also used for the combustion of combustible gas or other fuels. The heat obtained from the combustion of fuel in the second combustion chamber 315 is used to further heat the water in the water channel 323 through the heat exchange device 316 to meet the user's demand for hot water.

Specifically, a second burner 311 is provided on the top of the second combustion chamber 315 , and related components required for fuel combustion are provided in the second burner 311 . Fuel, namely combustible gas, enters the second burner 311 from the top of the second combustion chamber 315 for combustion.

The second combustion chamber 315 communicates with the second burner 311 , and the high-temperature flue gas generated by fuel combustion flows into the second combustion chamber 315 . The inner cavity of the second combustion chamber 315 is used for setting the heat exchange device 316 . The installation of the second combustion chamber 315 facilitates the installation of the heat exchange device 316, and allows the water flowing through the heat exchange device 316 to fully convect heat with the high-temperature flue gas as much as possible.

A heat exchange device 316 is provided in the second combustion chamber 315 . The heat exchange device 316 is connected to the waterway 323 . The water in the waterway 323 flows into the heat exchange device 316 after absorbing the waste heat of the thermoacoustic engine 319 , that is, preheated, and can convectively exchange heat with the high-temperature flue gas for further heating.

The second combustion chamber 315 is provided to obtain hot water with a higher temperature to meet the needs of users.

Further, the heat exchange device 316 may be a main heat exchanger for absorbing sensible heat of high-temperature flue gas. It may also be a heat exchanger including a main heat exchanger and a condensing heat exchanger. The condensing heat exchanger is used to absorb the latent heat of the flue gas, and the combined use of the main heat exchanger and the condensing heat exchanger is conducive to improving the thermal efficiency of the device.

On the basis of the above embodiments, further, the combustible gas includes: biogas.

This embodiment describes combustible gas based on the above-mentioned embodiments. The cogeneration device can use biogas as combustible gas to generate heat.

As a renewable energy source, biogas can be used for power generation and heating, which can not only save energy consumption, improve economy, but also realize full utilization of energy, which can reduce the pressure of energy shortage.

The existing domestic biogas power generation device has a high system complexity, high cost, inconvenient maintenance, and the thermal energy utilization rate of biogas is not high, so it is not efficient and economical when used.

Based on the above problems, this embodiment provides a household biogas cogeneration device according to the present invention that uses biogas as fuel and uses a thermoacoustic engine 319, which has the advantages of high efficiency, simple structure, and reliable operation. The two-way turbine power generation with strong power expansion is used as an acoustic-electric conversion device to burn biogas to generate electricity, and at the same time recover and utilize the waste heat of the thermoacoustic engine 319. A simple structure, convenient operation and maintenance, and high efficiency are proposed. The more reasonable biogas heat and power cogeneration device in terms of efficiency and economy has greater advantages and potential in the utilization of biogas for small and medium-sized households.

On the basis of the above-mentioned embodiments, with reference to Fig. 4, a household biogas cogeneration device also includes: a purification device 33 and a gas storage tank 35; one end of the purification device 33 is connected to one end of a biogas suction pump 32, the The other end of the biogas suction pump 32 is connected to the biogas source, the other end of the purification device 33 is connected to the gas storage tank 35 through the gas pipeline 34, and the gas storage tank 35 is connected to the gas storage tank 35 through the first biogas regulating valve 36. The first combustion chamber 312 is connected, the gas storage tank 35 is connected with the second combustion chamber 315 through the second biogas regulating valve 37, the first combustion chamber 312 is connected with the first air regulating valve 39, and the second The combustion chamber 315 is connected to the second air adjustment valve 310 .

This embodiment is based on the above-mentioned embodiment, adding a purification device 33, a biogas suction pump 32, a gas pipeline 34, a gas storage tank 35, a first biogas regulating valve 36 and a second biogas regulating valve 37, which are used as combustible gas introduction devices. First, the biogas suction pump 32 pumps the biogas from the biogas source to the purification device 33 for purification.

Purification of biogas before combustion can improve combustion efficiency, reduce the generation of pollutants, and avoid pollution to the environment.

The biogas after the purification device 33 enters the gas storage tank 35 through the gas pipeline 34 for storage. When power generation is required, the first combustion chamber 312 needs to be ignited. At this time, the first biogas regulating valve 36 can be activated to adjust the flow rate of the biogas entering the first combustion chamber 312 from the gas storage tank 35 , and the biogas is transported from the gas storage tank 35 to the first combustion chamber 312 for combustion.

Meanwhile, the first combustion chamber 312 is also connected with the first air regulating valve 39 . The first air regulating valve 39 may be connected with an external air source. The first air regulating valve 39 is used to adjust the flow rate of the air entering the first combustion chamber 312, and deliver the air to the inside of the first combustion chamber 312 for biogas combustion.

When the second combustion chamber 315 needs to be ignited to obtain high-temperature hot water, the second biogas regulating valve 37 can be activated to adjust the flow of biogas entering the second combustion chamber 315 from the gas storage tank 35, and the biogas is transported from the gas storage tank 35 to the second combustion chamber 315 for combustion.

Meanwhile, the second combustion chamber 315 is also connected to the second air regulating valve 310 . The second air adjustment valve 310 may be connected to an external air source. The second air regulating valve 310 is used to adjust the flow rate of the air entering the second combustion chamber 315, and deliver the air to the inside of the second combustion chamber 315 for biogas combustion.

The first biogas regulating valve 36 , the second biogas regulating valve 37 , the first air regulating valve 39 and the second air regulating valve 310 are all flow regulating valves, which are used to control the transportation of biogas and air through flow regulation.

On the basis of the above embodiments, further, with reference to FIG. 4 , a domestic biogas cogeneration device further includes: a control device 31; the control device 31 includes a controller 101 and an electric energy storage 102, and the controller 101 is respectively It is connected with the biogas suction pump 32, the first biogas regulating valve 36, the second biogas regulating valve 37, the first air regulating valve 39 and the second air regulating valve 310, and the electric energy storage 102 is connected with the bidirectional turbine power generation device 321 connected.

Based on the above-mentioned embodiments, this embodiment further describes a domestic biogas cogeneration device. On the basis of the cogeneration device provided in the above embodiments, a control device 31 is added to monitor the operation status of the entire system in real time to ensure the safety and efficiency of the entire system.

A controller 101 is provided in the control device 31 . The controller 101 can be connected with the biogas extraction pump 32 and each regulating valve respectively through cables. The controller 101 can be used to separately control the biogas pump 32 and each regulating valve, and then control the whole system to supply power or heat. By controlling the start and stop of the biogas suction pump 32 and each regulating valve and the specific flow rate, the whole system can be controlled more precisely.

In the whole system, only the first combustion chamber 312 can be activated for power supply, or only the first combustion chamber 312 can be activated for power supply and waste heat can be used for heat supply. It is also possible to start only the second combustion chamber 315 for heat supply. Or the first combustion chamber 312 and the second combustion chamber 315 can be started at the same time to supply both power and heat, and can provide hot water at a higher temperature while supplying power.

The heat generated by biogas combustion can be used for power generation, cogeneration of heat and power, or heating of domestic water alone. Different modes of power supply and heating can be selected according to needs.

The control device 31 also includes an electrical energy store 102 . The electric energy storage 102 can be connected with the two-way turbine power generation device 321 through a cable, and is used for storing the generated electric energy, which is convenient for use.

A household biogas cogeneration device proposed in this embodiment is based on a thermoacoustic generator, and mainly consists of a control device 31, a biogas purification device 33, a gas storage tank 35, a first combustion chamber 312, a second combustion chamber 315, a thermoacoustic The engine 319, the two-way turbine power generation device 321, the waterway 323, the gas pipeline 34 and the corresponding biogas suction pump and various regulating valves are composed.

Since the thermoacoustic engine 319 has a small volume, simple structure, and high heat utilization rate, the structure of the entire system can be effectively simplified, and the scale of thermoacoustic power generation can be flexibly designed according to actual needs, and its construction scale can be large. Small size, low construction cost, short period, suitable for domestic biogas utilization system.

Further, desulfurization packing is provided in the purification device 33 . It is used to reduce the sulfur content in biogas, improve the purity of biogas to promote power generation efficiency and protect the environment.

On the basis of the above embodiments, further, the gas storage tank 35 is respectively connected to a pressure sensor 501 and a gas detector 502 , and the pressure sensor 501 and the gas detector 502 are respectively connected to the controller 101 .

This embodiment is based on the above embodiments, and a pressure sensor 501 and a gas detector 502 are added to the gas storage tank 35 .

The gas storage tank 35 is provided with a pressure sensor 501 and a gas detector 502. The pressure sensor 501 monitors the pressure in the gas storage tank 35 in real time to ensure that the internal pressure of the gas storage tank 35 is at a reasonable level and that there is enough gas in the gas storage tank 35. amount of biogas. Whether there is biogas leakage in the gas storage tank 35 is monitored in real time by the gas detector 502 .

The controller 101 in the control device 31 is connected to the pressure sensor 501 and the gas detector 502 respectively, and can monitor the safety status of the gas storage tank 35 at any time.

Adding a pressure sensor 501 and a gas detector 502 can ensure the safety of the gas storage tank 35 and improve the safety of the entire system.

On the basis of the above embodiments, further, the outer wall of the air storage tank 35 is coated with heat dissipation paint.

This embodiment is based on the above-mentioned embodiments, and the outer wall of the air storage tank 35 is coated with heat dissipation paint, for example, heat dissipation paint. The gas storage tank 35 is used to store the purified biogas, and the outer wall of each part of the gas storage tank 35 is coated with a heat-dissipating paint to improve the stability of the biogas in the gas storage tank 35 .

Coating heat-dissipating paint on the outer wall of the gas storage tank 35 can prevent the explosion of biogas, and conduct the heat of each part of the biogas tank to avoid heat accumulation inside the gas tank, and avoid the biogas temperature in the gas storage tank 35 in high temperature weather. The hidden dangers of rising.

At the same time, the heat-dissipating coating also has a certain performance of flame retardancy, rust prevention, scratch resistance, and organic chemical resistance, which can improve the hardness and impact resistance of the surface of the gas storage tank 35, and is conducive to improving the safety of the gas storage tank 35.

On the basis of the above embodiments, further, the diameter ratio of the gas pipeline to the gas storage tank 35 is: 1:5-1:8.

In this embodiment, the relative dimensions of the gas pipeline and the gas storage tank 35 are described based on the above embodiments. The diameter ratio of the gas transmission pipeline to the gas storage tank 35 is 1:5-8, which is beneficial to control the speed of input and output biogas to avoid safety hazards caused by too fast or too small gas flow.

This embodiment describes the two-way turbine power generation device 321 based on the above-mentioned embodiments. The bi-directional turbogenerator 321 includes a turbine and a rotary generator 214 . Bidirectional turbines can be used to convert the mechanical energy of gas oscillations into unidirectional rotational motion. Thereby driving the rotary generator 214 to generate electricity.

Specifically, the turbine may be a Wells turbine or a two-way impulse turbine.

The schematic diagram of Wells turbine moving blade 211 as shown in Fig. 5, its principle belongs to the "lift type" and adopts symmetrical wings. As shown in FIG. 6 , it is a schematic diagram of a bidirectional impingement turbine moving blade 211 , which is the same as a traditional single-stage axial flow impingement turbine. On both sides of the Wells turbine or the two-way impact turbine, a set of guide vanes 212 are respectively assembled. As shown in FIG. Diffuser cascade. After the reciprocating fluid flows through the guide vanes 212, the generated thrust makes the turbines rotate in the same direction.

On the basis of the foregoing embodiments, further, with reference to FIG. 8 , the thermoacoustic engine 319 includes at least one basic engine unit; 193, the hot end heat exchanger 194, the thermal buffer pipe 195, the secondary cooler 196 and the second connecting pipe 197 are connected in sequence, the hot end heat exchanger 194 is connected to the thermal bridge 318, and the first connecting pipe 191 It is connected with the second connecting pipe 197 through a resonant pipe 322 .

On the basis of the above embodiments, further, with reference to FIG. 8 , a plurality of basic engine units are connected in series through a resonance tube 322 to form a loop, and the two-way turbine power generation device 321 is connected in series or bypassed in the loop, so The two-way turbine power generation device 321 is placed near the top of the resonant tube 322 of the secondary cooler 196, and a DC suppressor 320 is provided in the first connecting tube 191 of a basic engine unit.

This embodiment describes the structure of the thermoacoustic engine 319 based on the above-mentioned embodiments. The thermoacoustic engine 319 is constituted by an engine basic unit. The basic unit of the thermoacoustic engine 319 includes a first connecting pipe 191, an engine main cooler 192, an engine regenerator 193, an engine hot end heat exchanger 194, a heat buffer pipe 195, an engine secondary cooler 196, and a second connecting pipe 197 .

The engine hot end heat exchanger 194 is used to connect with the thermal bridge 318 to receive external heat. The main engine cooler 192 is used to take away heat from the room temperature end of the engine regenerator 193 , so that a large temperature gradient is generated in the axial direction of the engine regenerator 193 .

The engine regenerator 193 is used for the heated working fluid gas to generate thermoacoustic vibrations in it, and convert thermal energy into mechanical energy to generate sound work. The heat buffer pipe 195 is located between the engine hot-end heat exchanger 194 and the engine sub-cooler 196, and is used to realize the thermal isolation between the engine hot-end heat exchanger 194 and the engine sub-cooler 196, so as to reduce the heat of the engine hot-end heat exchanger 194. The heat leakage to the engine subcooler 196 also allows the sound work to be transferred outward from the high temperature area of the engine.

Further, the number of basic units of the thermoacoustic engine 319 can be set according to actual needs. When the required power supply is low, a small number of basic engine units can be used. When the required power supply is higher, a larger number of basic engine units can be used.

When the thermoacoustic engine 319 has only one basic engine unit, the resonant tube 322 connects the first connecting tube 191 and the second connecting tube 197 to form a loop. When the thermoacoustic engine 319 consists of two or more basic engine units, the basic engine units are connected in series, and any two adjacent basic units are connected through a resonant tube 322 to form a loop.

The two-way turbine generating device 321 can be connected in series or bypassed in the loop. Theoretically, bi-directional turbogenerator 321 could be located anywhere in the loop. Preferably, the two-way turbine power generation device 321 is placed near the top of the resonant tube 322 of the secondary cooler 196 , that is, where the resonant tube 322 meets the second connecting tube 197 .

Further, the DC suppressor 320 can be arranged at the inlet of any one of the engine basic unit main coolers 192 to suppress the mass flow generated in the loop and significantly improve the system efficiency. In the loop formed by a plurality of thermoacoustic engines 319 in series, only one DC suppressor 320 is required, and one DC suppressor 320 can be arranged in the first connecting pipe 191 of any basic engine unit.

Further, the waterway 323 may be in contact with the main cooler 192 of the thermoacoustic engine 319 . The water channel 323 absorbs the waste heat of the main cooler 192, and heats up the temperature of the water.

On the basis of the above embodiments, further referring to FIG. 9 , the two-way turbine power generation device specifically includes: turbine moving blades 211, guide vanes 212, connecting shafts 213, fairings 215, and rotary generators 214; Guide vanes 212 are respectively arranged on both sides of the turbine moving blade 211, and the turbine moving blade 211 is connected with the rotating shaft of the rotary generator 214 through the connecting shaft 213, and the rotary generator 214 is arranged on one side or both sides of the turbine moving blade 211 , the fairing 215 is used to rectify the inflow and outflow of gas, and the rotary generator 214 is arranged inside or outside the fairing 215 .

In this embodiment, the specific structure of the two-way turbine generator 321 is described based on the above embodiments. The two-way turbine power generation device 321 includes turbine moving blades 211 , guide vanes 212 , connecting shaft 213 , rotary generator 214 , and fairing 215 . The fairing 215 is used to rectify the gas flowing into and out of the turbine area to reduce losses.

Turbine moving blades 211 , guide vanes 212 , connecting shaft 213 , rotary generator 214 , and fairing 215 are all arranged inside the connecting pipe 216 .

The rotary generator 214 can be placed inside the spinner 215 or outside the spinner 215 . The rotary generators 214 can be arranged symmetrically or on one side. The two-way turbine power generation device 321 converts the alternating flow of reciprocating gas into rotational motion, thereby driving the rotating electrical machine to generate electricity.

The two-way turbines mentioned above can be connected in series in the loop, or can be bypassed in the loop.

The two-way turbines mentioned above are all single-stage turbines, and can also be N-stage turbines. N is an integer greater than 1. The N-stage turbines are connected in series by single-stage turbines, which jointly drive the same rotating shaft to rotate in one direction. Drive a rotating electrical machine to generate electricity.

On the basis of the foregoing embodiments, further, with reference to Fig. 4, a household biogas cogeneration device, which consists of a control device 31, a biogas purification device 33, a gas storage tank 35, a first combustion chamber 312, and a second combustion chamber 315, a thermoacoustic engine 319, a two-way turbine power generation device 321, a waterway 323, a gas pipeline 34, and corresponding biogas pumps and air pumps.

The thermoacoustic generator consists of three groups of thermoacoustic engines 319 basic units connected in series end to end through acoustic resonance tubes 322 . The two-way turbine power generation device 321 is placed near the top of the resonant tube 322 of the secondary cooler 196, and converts the alternating flow of reciprocating gas into rotary motion, thereby driving the rotary motor to generate electricity.

The two-way turbine power generation device 321 can be connected in series with the pipeline, and can also be connected in the pipeline by the side. The acoustic resonance tube 322 is used to make the engine loop system have a good impedance phase. The DC suppressor 320 can be arranged at the inlet of any main engine cooler 192 to suppress the mass flow generated in the loop and significantly improve the system efficiency.

When the whole system is running, the biogas suction pump 32 sucks the biogas into the purification device 33, and the filler in the purification device 33 reacts with the biogas to remove a large amount of sulfur in the biogas and improve the purity of the biogas. The purified biogas is stored in the gas storage tank 35 .

When power generation is required, the first biogas regulating valve 36 and the first air regulating valve 39 are activated, and the mixture of air and biogas enters the first combustion chamber 312 for combustion to generate heat, and the waste gas generated by combustion is discharged through the first exhaust pipe 314 .

Inside the first combustion chamber 312 , the heat collection device 313 conducts the collected heat to the hot end heat exchanger 194 of the thermoacoustic engine 319 through the heat bridge 318 . The thermal energy is converted into reciprocating mechanical energy through the thermoacoustic engine 319 , thereby driving the two-way turbine to rotate in one direction, and then driving the rotary generator 214 to generate electricity.

The electric energy generated by the motor can be transmitted to the electric energy storage 102 in the control device 31 through cables, and can also be output to the outside for use by other electric equipment.

The water to be heated in the system first exchanges heat with the waste heat generated by the thermoacoustic engine 319 in the water channel 323 to obtain preheated hot water. If the heat supply of the thermoacoustic generator can meet the user's water demand, the second biogas regulating valve 37 and the second air regulating valve 310 may not be activated. At this time, the heating and power generation of the hot water required by the user are all completed by the thermoacoustic generator.

If the thermoacoustic generator cannot meet the user's water needs, the second biogas regulating valve 37 and the second air regulating valve 310 can be activated, and the mixture of air and biogas enters the second combustion chamber 315 for combustion to generate heat, and the waste gas produced by combustion passes through The second exhaust pipe 317 discharges. At this time, the preheated water flowing into the second combustion chamber 315 continues to exchange heat with the high-temperature flue gas generated by the biogas combustion in the second combustion chamber 315 to meet the water and electricity needs of users.

If the user does not need the thermoacoustic generator to generate electricity and the water entering the second combustion chamber 315 does not need to be preheated, the first biogas regulating valve 36 and the first air regulating valve 39 can be closed, and the second biogas regulating valve 37 and the second air regulating valve 37 can be activated. The regulating valve 310, that is, the thermoacoustic generator does not work, and the second combustion chamber 315 alone performs combustion work to provide water demand for users.

On the basis of the above embodiment, further, referring to Fig. 10 , another specific embodiment of a domestic biogas cogeneration device, compared with the above embodiment, the thermoacoustic engine 319 part includes four groups of thermoacoustic engines 319 basically unit. This embodiment can output greater electric energy to meet user needs.

This embodiment proposes a domestic biogas cogeneration device based on thermoacoustic power generation. By utilizing the advantages of thermoacoustic engine 319, such as high efficiency, simple structure, and reliable operation, it adopts a two-way turbine with high economy and strong power expansion to generate electricity. As a sound-to-electricity conversion device, it burns biogas to generate electricity, and recycles the waste heat of the thermoacoustic engine 319. At the same time, different modes can be selected for power supply and heat supply. The structure is simple, easy to operate and maintain, and the scale can be flexibly designed according to actual needs. It has greater advantages and potential in the utilization of biogas for small and medium-sized households.

Finally, the method of the present application is only a preferred embodiment, and is not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A domestic biogas cogeneration device, characterized in that it includes: a first combustion chamber, a thermoacoustic engine and a two-way turbine power generation device; the first combustion chamber is used to burn combustible gas to obtain heat, and in the second A heat collection device is installed inside a combustion chamber, the heat collection device is connected to the thermoacoustic engine through a thermal bridge, the thermoacoustic engine is connected to the bidirectional turbine power generation device, and the thermoacoustic engine is in contact with the waterway at the same time connect. 2. The household biogas cogeneration device according to claim 1, further comprising: a second combustion chamber; the second combustion chamber is used to burn combustible gas, and a heat exchange device is arranged in the second combustion chamber The heat exchange device is connected to the water circuit, and the water in the water circuit flows through the heat exchange device. 3. The household biogas cogeneration device according to claim 2, further comprising: a purification device and a gas storage tank; one end of the purification device is connected to one end of a biogas extraction pump, and the biogas extraction pump The other end is connected to the biogas source, the other end of the purification device is connected to the gas storage tank through the gas pipeline, the gas storage tank is connected to the first combustion chamber through the first biogas regulating valve, and the gas storage tank The tank is connected to the second combustion chamber through the second biogas regulating valve, the first combustion chamber is connected to the first air regulating valve, and the second combustion chamber is connected to the second air regulating valve. 4. The household biogas cogeneration device according to claim 3, characterized in that it also includes: a control device; the control device includes a controller and an electric energy storage, and the controller is connected to the biogas suction pump, the second A biogas regulating valve, a second biogas regulating valve, a first air regulating valve and a second air regulating valve are connected, and the electric energy storage is connected with the bidirectional turbine power generation device. 5. The household biogas cogeneration device according to claim 3, wherein the gas storage tank is respectively connected to a pressure sensor and a gas detector, and the pressure sensor and the gas detector are respectively connected to the controller connected. 6 . The household biogas cogeneration device according to claim 3 , characterized in that, the outer wall of the gas storage tank is coated with a coating for heat dissipation. 7 . 7. The household biogas cogeneration device according to claim 3, characterized in that the diameter ratio of the gas pipeline to the gas storage tank is 1:5-1:8. 8. The household biogas cogeneration device according to claim 1 or 4, characterized in that, the thermoacoustic engine comprises at least one engine basic unit; any one of the engine basic units consists of a first connecting pipe, a main cooler , regenerator, hot end heat exchanger, thermal buffer pipe, secondary cooler and second connecting pipe are connected in sequence, the hot end heat exchanger is connected to the heat bridge, the first connecting pipe and the second connecting pipe The two connecting pipes are connected through the resonance pipe. 9. The household biogas cogeneration device according to claim 8, characterized in that, a plurality of the basic engine units are connected in series through a resonance tube to form a loop, and the two-way turbine power generation device is connected in series or bypassed to the loop In the above, the two-way turbine power generation device is placed near the top of the resonant tube of the secondary cooler, and a DC suppressor is set in the first connecting tube of a basic engine unit. 10. The domestic biogas cogeneration device according to claim 1, characterized in that, the two-way turbine power generation device specifically includes: turbine moving blades, guide vanes, connecting shafts, fairings and rotary generators; Guide vanes are respectively arranged on both sides of the turbine moving blade, and the turbine moving blade is connected with the rotating shaft of the rotary generator through the connecting shaft, and the rotary generator is arranged on the turbine One side or two sides of the translation blades, the fairing is used to rectify the inflow and outflow of gas, and the rotary generator is arranged inside or outside the fairing.