Kitchen oil fume residual energy recovery device

Abstract

The utility model relates to a kitchen oil fume residual energy recovery device which comprises a gas guide branch pipe which is of a bent structure and is connected to the side face of a flue of an exhaust system, and a pipe opening of the gas guide branch pipe right faces the incoming flow direction of flue gas; one end of the reducing spray pipe is connected to the tail end of the air guide branch pipe, and the other end is connected with the Tesla turbine; the Tesla turbine comprises a shell and an air inlet nozzle installed on the shell, the air inlet nozzle is communicated with a reducing spray pipe, the Tesla turbine further comprises rotors in the shell, an air flue is arranged between the rotors, and smoke entering the turbine flows in the air flue to drive the rotors to rotate. The alternating-current generator is connected with the Tesla turbine through an energy conversion device; a heater is arranged at the bottom of the heat storage water tank and is electrically connected with the alternating-current generator; by means of the kitchen oil fume residual energy recovery device, continuous supply of residual heat energy generated by kitchen oil fume in the time period except cooking is achieved.

Description

Technical Field

[0001] This invention relates to the field of residual energy recovery technology for kitchen fumes, specifically to a device for recovering residual energy from kitchen fumes. Background Technology

[0002] Tesla turbines are primarily used in applications including small size, low cost, low maintenance, non-traditional working media, waste heat recovery, geothermal energy, energy harvesting, solar energy, organic Rankine cycles, and hydropower. Research is particularly extensive in the areas of small size, low cost, and non-traditional working media, with small-size applications closely related to waste heat recovery, energy harvesting, and organic Rankine cycles.

[0003] With continuous social development, people's demand for energy is increasing. Guided by the goals of carbon peaking and carbon neutrality, waste heat recovery in buildings has attracted widespread attention. As an important part of a building, the kitchen has great potential for waste heat recovery from cooking fumes. While cooking fumes contain various harmful substances, they also possess a certain amount of thermal and kinetic energy. However, current technologies lack mechanisms for recovering this thermal and kinetic energy, resulting in significant energy waste. If the thermal and kinetic energy in cooking fumes could be recovered after proper pretreatment, substantial economic benefits would be achieved. However, even after purification by a fume purifier, a small amount of grease remains. When these gases pass through heat pipes for heat transfer, grease adhesion affects heat exchange, necessitating regular cleaning of the heat pipe evaporator section.

[0004] In addition to the issues mentioned above, existing kitchen fume waste heat recovery devices on the market also share some common problems: kitchen fumes are only generated and emitted during cooking. As an intermittent heat source, waste heat is only recovered during its emission period, and it cannot guarantee a continuous energy supply during the time other than cooking. Summary of the Invention

[0005] To address the shortcomings of related technologies, this utility model provides a kitchen oil fume residual energy recovery device. It utilizes an air guide branch pipe on the chimney at the end of the exhaust system fan, a throttle valve, a tapered nozzle connected to the end of the air guide branch pipe, a Tesla turbine, a speed sensor, an alternator, an energy storage device, and a matching control circuit to continuously supply the residual heat energy generated by kitchen oil fumes during periods other than cooking.

[0006] To achieve the above objectives, this utility model provides a device for recovering residual energy from kitchen fumes.

[0007] In some embodiments, the kitchen fume residual energy recovery device includes:

[0008] The air guide branch pipe has a bent structure and is connected to the side of the flue of the exhaust system. The outlet of the air guide branch pipe faces the direction of flue gas flow.

[0009] The converging nozzle is connected at one end to the end of the air guide branch pipe and at the other end to the Tesla turbine.

[0010] The Tesla turbine includes a housing and an air intake nozzle mounted on the housing. The air intake nozzle is connected to a converging nozzle. It also includes a rotor inside the housing. An air duct is provided between the rotors. The flue gas entering the turbine flows in the air duct and drives the rotor to rotate.

[0011] An alternator, which is connected to a Tesla turbine via an energy conversion device;

[0012] The hot water storage tank has a heater at the bottom, which is connected to an AC generator;

[0013] In some embodiments, the kitchen fume residual energy recovery device further includes:

[0014] A throttle valve is installed between the air guide branch pipe and the converging nozzle. The throttle valve is equipped with a valve stem and a valve core for changing the cross-sectional area of ​​the pipe.

[0015] In some embodiments, the cross-sectional area of ​​the internal passage of the tapered nozzle gradually decreases along the airflow direction.

[0016] In some embodiments, the outer surface of the tapered nozzle is covered with an insulating material.

[0017] In some embodiments, the cross-sectional area of ​​the Tesla turbine nozzle gradually decreases along the direction of flue gas flow.

[0018] In some embodiments, the Tesla turbine rotor consists of a series of coaxial parallel rigid disks mounted on a central shaft with tiny gaps between them. Fluid flows along a helical path in the gaps between the disks and flows out of the rotor through holes near the shaft.

[0019] In some embodiments, an oil reservoir is arranged in the lower part of the internal cavity of the Tesla turbine to periodically clean oil droplets thrown off by the rotor.

[0020] In some embodiments, the hot water storage tank includes:

[0021] A water level sensor, located on the side of the hot water storage tank, is used to monitor the water level in the tank.

[0022] A temperature sensor, located on the side of the hot water storage tank, is used to monitor the temperature of the water in the tank.

[0023] A water pump, located on the side of the hot water storage tank, is used to replenish the hot water storage tank with cold water;

[0024] An auxiliary heat source, located on the side of the hot water storage tank, is used to help maintain the temperature of the water in the tank.

[0025] The hot water outlet is located at the bottom of the hot water storage tank.

[0026] In some embodiments, the Tesla turbine also includes a speed sensor for monitoring whether the Tesla turbine rotor is rotating.

[0027] Compared with the prior art, the advantages of this utility model are:

[0028] 1) This utility model enables the continuous supply of waste heat energy generated by kitchen fumes during periods other than cooking time by installing a duct branch pipe, a throttle valve, a tapered nozzle connected to the end of the duct branch pipe, a Tesla turbine, a speed sensor, an alternator, an energy storage device, and a matching control circuit on the chimney at the end of the exhaust system fan.

[0029] 2) By designing a hot water storage tank, the remaining energy can be stored to prevent it from being lost quickly; when the heat supply is insufficient, it can still meet part of the domestic hot water demand.

[0030] 3) By covering the outer surface of the converging nozzle with thermal insulation material, the heat loss generated when the flue gas drawn out through the air guide branch flows in the nozzle is reduced.

[0031] 4) A removable oil reservoir is arranged in the lower part of the internal cavity of the Tesla turbine to facilitate the periodic cleaning of oil droplets thrown off by the rotor.

[0032] 5) By setting a throttle valve, the flow rate entering the converging nozzle can be adjusted, thereby controlling the rotational speed of the Tesla turbine rotor to prevent it from becoming too high and avoiding deformation or even disintegration of the Tesla turbine rotor.

[0033] 6) By setting a tapered nozzle, the flow rate of treated kitchen fumes entering the Tesla turbine is increased, thereby improving the efficiency of the Tesla turbine. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0035] Figure 1 A schematic diagram of the gas guide branch pipe in the residual energy recovery device for kitchen fumes provided in this embodiment of the utility model;

[0036] Figure 2 A schematic diagram of the tapered nozzle in the residual energy recovery device for kitchen fumes provided in this embodiment of the utility model;

[0037] Figure 3 A schematic diagram of the Tesla turbine in the residual energy recovery device for kitchen fumes provided in this embodiment of the utility model;

[0038] Figure 4 A schematic diagram of the hot water storage tank in the residual energy recovery device for kitchen fumes provided in this embodiment of the utility model;

[0039] Figure 5 A schematic diagram of the control circuit in the residual energy recovery device for kitchen fumes provided in this embodiment of the utility model;

[0040] Figure 6 This is a schematic diagram of the profile of a tapered nozzle.

[0041] In the diagram: 1-Air guide branch pipe, 2-Converging nozzle, 3-Tesla turbine, 4-Support rod, 41-Water level sensor, 42-Temperature sensor, 43-Heater, 44-Water pump, 45-Auxiliary heat source, 46-Hot water outlet, 47-Throttle valve, 48-Speed ​​sensor, 5-Nozzle, 6-Rotor. Detailed Implementation

[0042] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0043] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] Example

[0046] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, this utility model provides a kitchen fume residual energy recovery device to continuously supply the waste heat energy generated by kitchen fumes during periods other than cooking. The kitchen fume residual energy recovery device includes:

[0047] A duct 1, with a bent structure, is connected to the side of the exhaust system flue, with the inlet of the duct 1 facing the direction of flue gas flow. A tapered nozzle 2 is connected at one end to the end of the duct 1 and at the other end to the Tesla turbine 3. The Tesla turbine 3 includes a housing and an air inlet nozzle 5 mounted on the housing, the air inlet nozzle 5 being connected to the tapered nozzle 2. It also includes a rotor 6 inside the housing, with an air duct between the rotors 6. The flue gas entering the turbine flows in the air duct, driving the rotors 6 to rotate. An alternator is connected to the Tesla turbine 3 through an energy conversion device. A hot water storage tank 4 has a heater 43 at the bottom, which is connected to the alternator.

[0048] Through the above technical solution, the exhaust branch pipe 1 at the end of the exhaust fan chimney is connected to the converging nozzle 2, Tesla turbine 3, hot water storage tank 4 and supporting control circuit at the end of the exhaust branch pipe 1, so that the waste heat energy generated by kitchen fumes can be continuously supplied during the time period other than cooking.

[0049] In some embodiments, the kitchen fume residual energy recovery device further includes:

[0050] A throttle valve 47 is installed between the air guide branch pipe 1 and the converging nozzle 2. The throttle valve 47 is equipped with a valve stem and a valve core for changing the cross-sectional area of ​​the pipe.

[0051] The above technical solution adjusts the flow rate and pressure of the pipeline by changing the cross-sectional area. When the fluid passes through the throttle valve 47, the flow cross-section suddenly contracts, causing the fluid velocity to increase and the pressure to decrease. The throttle valve 47 is installed between the air guide branch pipe 1 and the converging nozzle 2, which can regulate the flow rate entering the converging nozzle 2, thereby controlling the rotational speed of the Tesla turbine rotor 6 to prevent it from becoming too high and avoiding deformation or even disintegration of the Tesla turbine rotor 6.

[0052] In some embodiments, the cross-sectional area of ​​the internal channel of the tapered nozzle 2 gradually decreases along the airflow direction.

[0053] The longitudinal section configuration of the tapered nozzle can be selected from the Vitosinski curve, such as... Figure 6 As shown. The empirical formula for the Vitosinski curve is as follows:

[0054]

[0055] The above technical solution involves setting a tapered nozzle 2 to increase the flow rate of treated kitchen fumes into the Tesla turbine 3, thereby improving the efficiency of the Tesla turbine 3.

[0056] In some embodiments, the outer surface of the tapered nozzle 2 is covered with an insulating material.

[0057] By using the above technical solution, thermal insulation material is covered on the outer surface of the converging nozzle 2 to reduce heat loss generated when the flue gas drawn out through the air guide branch pipe 1 flows in the converging nozzle 2.

[0058] In some embodiments, the cross-sectional area of ​​the Tesla turbine nozzle 5 gradually decreases along the fluid flow direction.

[0059] Through the above technical solution, the cross-sectional area of ​​the Tesla turbine nozzle 5 gradually decreases along the flue gas flow direction to accelerate the working fluid and make the fluid velocity reach its maximum at the nozzle 5 outlet.

[0060] In some embodiments, such as Figure 3 As shown, the Tesla turbine rotor 6 consists of a series of coaxial parallel rigid disks mounted on a central shaft. A small gap is maintained between the disks, and fluid flows along a spiral path in the gap between the disks. The fluid flows out of the rotor through a hole near the shaft.

[0061] Through the above technical solution, the Tesla turbine rotor 6 consists of a series of coaxial parallel rigid disks mounted on a central shaft. A small gap is maintained between the disks, allowing fluid to flow along a helical path within these gaps and finally exit from the rotor 6 through holes near the shaft. The main dimensional parameters of the rotor disks include the disk spacing b, disk thickness t, and disk inner diameter R. in outer diameter R of the disk out The disc drives the rotor 6 to rotate, and the flue gas is discharged from the exhaust port in the center of the turbine. At the same time, the speed sensor 48 collects the speed data of the rotor 6 in real time and transmits it to the control circuit to determine the opening and closing of the throttle valve 47. To minimize heat loss of the flue gas during the flow process, it is advisable to cover the outer surface of the converging nozzle 2 with heat insulation material.

[0062] In some embodiments, a removable oil reservoir is arranged in the lower part of the internal cavity of the Tesla turbine to periodically clean oil droplets thrown off by the rotor 6.

[0063] Through the above technical solution, a detachable oil reservoir is arranged in the lower part of the internal cavity of the Tesla turbine 3 to facilitate the periodic cleaning of oil droplets thrown off by the rotor; the speed sensor 48 should be a non-contact measurement sensor such as a magnetoelectric type to avoid damaging the high-speed rotating Tesla turbine rotor 6.

[0064] In some embodiments, the hot water storage tank 4 includes:

[0065] A water level sensor 41 is located on the side of the hot water storage tank 4 and is used to monitor the water level in the hot water storage tank 4.

[0066] Temperature sensor 42 is located on the side of hot water storage tank 4 and is used to monitor the temperature of the water in hot water storage tank 4;

[0067] Water pump 44 is located on the side of hot water storage tank 4 and is used to replenish cold water to hot water storage tank 4;

[0068] An auxiliary heat source 45 is located on the side of the hot water storage tank 4 and is used to help maintain the temperature of the water in the hot water storage tank 4.

[0069] Hot water outlet 46 is located at the bottom of hot water storage tank 4.

[0070] Heater 43 is located at the bottom of hot water storage tank 4. The electrical energy generated by the alternator is converted into heat by heater 43 and transferred to the water in hot water storage tank 4.

[0071] Through the above technical solution, the electric heater 43 consumes electrical energy generated by the alternator driven by the Tesla turbine 3 to heat the water in the hot water storage tank 4 during flue gas supply. Temperature sensor 42 monitors the water temperature in the hot water storage tank 4, and water level sensor 41 monitors the water level in the tank; together, they determine the activation and deactivation of the auxiliary heat source 45 and the water pump 44. The water pump 44 activates when the water level in the hot water storage tank 4 is too low, replenishing the tank with cold water. Domestic hot water is discharged through the domestic hot water outlet 46 for use. The electrical energy generated by the alternator is converted into heat by the electric heater 43 and transferred to the water in the hot water storage tank 4. Relying on the insulation design of the hot water storage tank 4 itself, the tank can ensure that the working fluid inside maintains a high temperature for a relatively long period to meet the demand for domestic hot water.

[0072] The supporting control circuit of the above technical solution includes the following components: water level sensor 41, temperature sensor 42, electric heater 43, water pump 44, auxiliary heat source 45, domestic hot water outlet 46, throttle valve 47, and speed sensor 48. The throttle valve 47 is used to control whether flue gas can enter the converging nozzle 2, and the speed sensor 48 is used to monitor whether the Tesla turbine rotor 6 is rotating.

[0073] When kitchen fumes are continuously generated, the treated fumes are introduced into the converging nozzle 2 through a duct installed on the chimney at the end of the exhaust system fan. In the converging nozzle 2, some of the thermodynamic and pressure energy of the fumes is converted into kinetic energy, resulting in a high velocity for the fumes as they enter the Tesla turbine 3 through the nozzle 5. As the fumes flow through the gaps between the rotors 6 inside the Tesla turbine 3, a boundary layer is formed. The resulting fluid viscosity force drives the rotors 6 of the Tesla turbine 3 to rotate, thereby driving an alternator that is slowed down by a reducer to generate electricity. While the Tesla turbine 3 is operating, oil droplets adhering to the rotors 6 are thrown off and eventually flow into the oil storage tank below the rotors. Simultaneously, the alternator drives the heater 43, and the heat generated is absorbed by the water in the hot water storage tank 4, converting and storing the remaining energy from the recovered fumes.

[0074] The supporting control circuit operates according to the following control strategy:

[0075] For ease of description, the upper and lower limits of the water temperature in the hot water storage tank are set as t2 and t1, respectively, and the upper and lower limits of the water level in the hot water storage tank are set as h2 and h1, respectively (h2 and h1 are both in units of [L]). The upper temperature limit margin is set as Δt2, the lower temperature limit margin is set as Δt1, and the upper and lower water level limits margins are set as Δh2 and Δh1, respectively. The return value of the temperature sensor 42 is recorded as t, and the water level monitored by the water level sensor 41 is recorded as h.

[0076] Under conditions of continuous flue gas generation:

[0077] when When the auxiliary heat source is activated, it is turned on; otherwise, it is turned off.

[0078] Only when h2-h≤Δh2, or Water pump 44 will only be turned off when the water pump is turned on; otherwise, water pump 44 will be turned on.

[0079] Only when Throttling valve 47 will only close when the condition is met; otherwise, throttle valve 47 will open.

[0080] Under conditions without flue gas supply:

[0081] The opening and closing state of throttle valve 47 does not need to be changed;

[0082] When h-h1≤Δh1, water pump 44 is turned on; otherwise, water pump 44 is turned off.

[0083] When t-t1≤Δt1, the auxiliary heat source 45 is turned on; otherwise, the auxiliary heat source 45 is turned off.

[0084] When flue gas or other fluids come into contact with the disk of the Tesla turbine, a thin boundary layer forms on the disk surface due to the fluid's viscosity. Within this boundary layer, the flue gas velocity near the disk surface is zero, while the velocity gradually increases with the distance from the disk surface until it reaches the velocity of the mainstream flue gas. Existing experimental data demonstrates that the Tesla turbine 3 can effectively convert the energy of the flue gas into mechanical energy, which is then further converted into electrical energy by a generator.

[0085] Tesla Turbo 3 has good adaptability to the recovery of low-grade energy such as kitchen exhaust gas, and it is feasible to recover and utilize the energy that would otherwise be wasted, which meets the needs of future development. At the same time, according to the theoretical calculations and experimental results of this invention, there is still room for further optimization in practical applications.

Claims

1. A device for recovering residual energy from kitchen fumes, characterized in that, The residual energy recovery device for kitchen fumes includes: The air guide branch pipe has a bent structure and is connected to the side of the flue of the exhaust system. The outlet of the air guide branch pipe faces the direction of flue gas flow. The converging nozzle is connected at one end to the end of the air guide branch pipe and at the other end to the Tesla turbine. The Tesla turbine includes a housing and an air intake nozzle mounted on the housing, the air intake nozzle being connected to a tapered nozzle, and a rotor inside the housing, with an air duct provided between the rotors, through which the flue gas entering the turbine flows and drives the rotor to rotate. An alternator, wherein the alternator is connected to a Tesla turbine via an energy conversion device; The hot water storage tank has a heater installed at the bottom, and the heater is connected to an AC generator.

2. The kitchen fume residual energy recovery device according to claim 1, characterized in that, The residual energy recovery device for kitchen fumes also includes: A throttle valve is installed between the air guide branch pipe and the converging nozzle. The throttle valve is equipped with a valve stem and a valve core for changing the cross-sectional area of ​​the pipe.

3. The kitchen fume residual energy recovery device according to claim 1, characterized in that, The cross-sectional area of ​​the internal channel of the tapering nozzle gradually decreases along the airflow direction.

4. The kitchen fume residual energy recovery device according to claim 1, characterized in that, The outer surface of the tapered nozzle is covered with thermal insulation material.

5. The kitchen fume residual energy recovery device according to claim 1, characterized in that, The cross-sectional area of ​​the Tesla turbine nozzle gradually decreases along the direction of fluid flow.

6. The kitchen fume residual energy recovery device according to claim 1, characterized in that, The Tesla turbine rotor consists of a series of coaxial parallel rigid disks mounted on a central shaft with a small gap between them. Fluid flows along a spiral path in the gap between the disks, and the flue gas flows out of the rotor through holes near the shaft.

7. The kitchen fume residual energy recovery device according to claim 1, characterized in that, An oil reservoir is located in the lower part of the internal cavity of the Tesla turbine to periodically clean the oil droplets thrown off by the rotor.

8. The kitchen fume residual energy recovery device according to claim 1, characterized in that, The hot water storage tank includes: A water level sensor, located on the side of the hot water storage tank, is used to monitor the water level in the tank. A temperature sensor, located on the side of the hot water storage tank, is used to monitor the temperature of the water in the tank. A water pump, located on the side of the hot water storage tank, is used to replenish the hot water storage tank with cold water; An auxiliary heat source, located on the side of the hot water storage tank, is used to help maintain the temperature of the water in the tank. The hot water outlet is located at the bottom of the hot water storage tank.

9. The kitchen fume residual energy recovery device according to claim 1, characterized in that, The Tesla turbine also includes a speed sensor for monitoring whether the Tesla turbine rotor is rotating.

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