Cooling power generation device

Abstract

The invention provides a heat exchange cooling power generation device which mainly utilizes a heat exchanger, a chimney, a wind driven generator and energy storage equipment to complete cooling and power generation, and waste heat recovery and zero-carbon energy are achieved. The heat exchanger is used for heating air and cooling high-temperature materials; the hot air generates wind power in the wind power pipeline, and the wind power pushes the wind power generator to generate power; the larger the temperature difference is, the larger the wind power generated by the wind power pipeline is, and the more the generated power is.

Description

Technical Field

[0001] This invention belongs to the field of green energy; in particular, it relates to waste heat recovery and wind power generation. Background Technology

[0002] A heat exchanger is a device that facilitates heat transfer between two or more fluids at different temperatures. It allows heat to be transferred from a high-temperature fluid to a low-temperature fluid, achieving cooling. The working principle of a heat exchanger is based on the three basic modes of heat transfer: conduction, convection, and radiation; in practical applications, a combination of multiple heat transfer modes is usually used. Indirect heat exchangers, where the hot and cold fluids are separated by a solid wall and do not come into contact, allow heat to be transferred from the hot fluid to the cold fluid through the wall; this is the most widely used type in industry. Shell-and-tube heat exchangers consist of a shell, tube bundle, tube sheet, and end caps. The tube bundle is installed inside the shell and fixed to the tube sheet at both ends. Features: robust structure, high reliability, wide applicability, able to withstand high temperature and pressure, easy to clean, but larger size and relatively lower heat transfer efficiency. Plate heat exchangers consist of a series of corrugated metal plates stacked together, forming thin rectangular channels through which heat exchange occurs. Features: High heat transfer efficiency, compact structure, small footprint, easy to disassemble and clean, but relatively weak temperature and pressure resistance, and the plates are prone to clogging. Finned tube heat exchangers add fins to ordinary base tubes to increase the heat transfer area and enhance heat transfer on the air side. Features: High heat transfer efficiency, effectively improving the low air-side heat transfer coefficient problem in gas-liquid heat exchange, and relatively simple structure. Spiral plate heat exchangers are made of two parallel metal plates rolled together to form two spiral channels, where hot and cold fluids flow in opposite directions for heat exchange. Features: High heat transfer efficiency, compact structure, turbulent flow within the channels, less prone to scaling, but difficult to maintain and limited pressure resistance. Plate heat exchangers and spiral plate heat exchangers have relatively high heat transfer efficiencies. Factors affecting heat transfer efficiency include the temperature difference between the fluids, the heat transfer area, and the structure of the heat exchanger.

[0003] For air-cooled heat exchangers, the larger the air volume (the higher the air velocity), the greater the convective heat transfer coefficient and the higher the heat exchange efficiency. The flow channel structure of the heat exchanger affects the path of air flowing through the heat exchanger (such as counterflow and crossflow), and affects the uniformity and efficiency of air volume distribution and heat exchange.

[0004] The principle of chimney effect power generation technology is based on the physical property that hot air is less dense than cold air, creating natural convection in vertical space. When air is heated in the heat source area, its density decreases, creating upward buoyancy; simultaneously, the external cold air, due to its higher density, generates downward pressure. These two forces work together to create a pressure difference between the inside and outside of the chimney. This pressure difference drives airflow along the chimney passage, creating accelerated airflow, promoting heat exchange, enhancing turbine rotation, and increasing the efficiency of the generator in converting kinetic energy into electrical energy. The greater the pressure difference, the higher the heat exchange efficiency and generator efficiency. The relationship between pressure difference, height, and temperature can be expressed by the following formula: ΔP = ρout⋅g⋅H⋅(Tin-Tout) / Tin (1) ρout: air density; g: acceleration due to gravity (9.81 m / s²) 2 H represents the height difference between the air inlet and outlet, and tin and Tout represent the temperatures of the indoor and outdoor air, respectively.

[0005] The relationship between pressure difference and wind speed is shown in Equation 2, that is, the pressure difference is proportional to the square of the wind speed.

[0006] ΔP = 1 / 2 ρV 2 (2) ΔP, pressure difference; ρ, air density; V, wind speed.

[0007] Therefore, the airflow velocity v generated by the chimney effect can be calculated using the following formula: v = [2gH(Tn – Tw) / Tn]1 / 2 (3) The taller the chimney, the greater the temperature difference between the inside and outside of the chimney, and the higher the airflow speed (when the temperature difference is 10-15℃, the wind speed reaches 4-6m / s).

[0008] Based on the principle of wind energy conversion, the power calculation formula for a wind turbine is as follows: P = 0.5 ρ·A·v3·Cp (4) P is the output power of the wind turbine (W); ρ is the air density (kg / m³). 3 A is the swept area of ​​the wind turbine (m²). 2 For horizontal axis wind turbines, A = π•R² (R is the blade radius); for vertical axis wind turbines, A = 2R •H (R is the blade radius, H is the blade height); v is the wind speed (m / s); Cp is the wind energy utilization coefficient, which represents the wind energy conversion efficiency, with a theoretical limit of 0.593 (Bates limit), and is usually between 0.25 and 0.47.

[0009] This formula shows that the power of a wind turbine is directly proportional to the air density, the swept area of ​​the rotor, and the cube of the wind speed. If the wind speed increases by 10%, the wind power will increase by approximately 33.1% (1.1...).3 = 1.33); if the wind speed doubles, the wind energy output will increase to 8 times the original value (2 3 = 8).

[0010] It is evident that the longer the wind turbine duct, the greater the temperature difference between the inside and outside of the duct, the greater the airflow velocity along the vertical channel, the stronger the wind force generated, the more electricity generated, and the higher the heat exchange and cooling efficiency. A smaller diameter at the top and a larger diameter at the bottom of the duct creates an acceleration channel (Venturi effect), further increasing the airflow velocity. Both the chimney height and the duct itself can affect heat exchange efficiency and the amount of electricity generated. Summary of the Invention

[0011] Based on the chimney effect and heat exchange principles, this invention provides a novel device system for enhancing heat exchange efficiency and generating green electricity. The heat exchanger is placed inside a chimney to exchange heat with the air. The heated air flows upwards, creating a low-pressure zone. The relatively high-pressure outside air is drawn into the chimney, accelerating the flow of air between the inside and outside, thus promoting heat exchange and cooling. The high-speed airflow drives a turbine and generator to produce green electricity. Furthermore, by utilizing energy storage technology to store the electricity generated by wind power, a zero-carbon energy system for cooling and waste heat recovery can be constructed. Heat exchanger + chimney (wind duct) + generator = green energy Waste heat + wind power generation + energy storage = green energy The main technical principles involved in this invention include the chimney effect, wind power generation, heat exchange, and energy storage; it is an integration of multiple disciplines. Wind ducts generate the chimney effect. Each end of the wind duct has an inlet and an outlet. The area of ​​the inlet and outlet, as well as the shape and length of the duct, affect the wind strength and power generation efficiency. Furthermore, the greater the temperature difference between the inlet and outlet, the stronger the wind generated. Therefore, the heat exchange efficiency of the heat exchanger, the size of the temperature difference, and the degree and shape of the chimney duct significantly affect the cooling effect and power generation. The heat exchanger and the chimney have a significant synergistic effect.

[0012] On the other hand, energy storage technologies include battery energy storage, phase change energy storage, sensible thermal energy storage, chemical energy storage, mechanical energy storage, compressed air energy storage, thermal energy storage, and reservoir energy storage. Chemical thermal energy storage technology, among others, is a long-term energy storage technology and also a cross-seasonal energy storage technology, capable of storing energy in summer and using it in winter (CN201910167308.8 Medium-temperature cross-seasonal thermal energy storage materials). The stored energy can be provided to users in both electrical and thermal forms.

[0013] The cooling power generation device involved in this invention, such as Figure 1As shown: Air inlet 2 is located at the bottom of the wind turbine duct or chimney duct 1, and turbine generator 3 is located at air inlet 2; 4 is the heat exchanger, located inside the chimney duct 1; 5 is the chimney outlet, located at the top of the wind turbine duct. Hot fluid flows downwards within the pipes of heat exchanger 4, exchanging heat with the air inside the chimney; the rising hot air carries external cold air into the chimney through air inlet 2, enhancing the heat exchange and cooling effect, while simultaneously increasing the speed and power output of turbine 3. Heat exchanger 4 can also be conical, with a small top and a large bottom; fins can be used to enhance the heat exchange efficiency.

[0014] Figure 2 This is a spiral tube heat exchanger, comprising: 1 a spiral heat exchange tube; 2 a support; 3 a hot fluid inlet for the heat exchange pipe; 4 a fluid outlet for the spiral heat exchange tube; 5 a hot fluid pipe, which also serves as a heat exchange tube; and 6 a fluid connection pipe between the hot fluid pipe 5 and the spiral heat exchange tube 1. Furthermore, the top spiral heat exchange tube 1 is shorter than the hot fluid pipe 5, while the bottom spiral heat exchange tube 1 is further away from the hot fluid pipe 5, forming a conical heat exchanger. Fins can also be used to enhance the heat exchange efficiency of heat exchange tubes 1 and 5.

[0015] Figure 3 This is a spiral tube heat exchanger, consisting of 1 (fluid inlet), 2 (support), 3 (spiral heat exchange tube, cylindrical or flat), and 4 (fluid outlet). The spiral tube 3 is narrow at the top and wide at the bottom, forming a conical heat exchanger. The hot fluid enters the spiral heat exchange tube 3 through inlet 1, flows downwards within the tube and cools down, exiting at outlet 4 as a cold fluid. Fins can be used to enhance heat exchange.

[0016] Figure 4 This is a spiral plate heat exchanger used for heat exchange of solid materials. 1 is a material tray, which also serves as the heat exchange spiral plate; 2 is a support column, or alternatively a rotating shaft, that drives the material tray 1 to rotate; 3 is the material outlet. Hot material flows from top to bottom on the material tray 1, simultaneously exchanging heat and cooling. The other side of the material tray is reinforced with fins to enhance heat exchange. Furthermore, the upper part of the heat exchange spiral plate 1 can be smaller, and the bottom larger, forming a conical heat exchanger.

[0017] Furthermore, the aforementioned cooling power generation device may or may not include an energy storage system.

[0018] Furthermore, the heat exchange cooling power generation device involves a wind turbine that can be placed at the top of the wind duct, or in the middle or bottom of the wind duct, and the wind in the duct drives the wind turbine to generate electricity; one wind duct can drive one wind turbine to generate electricity, or it can drive two or more wind turbines to generate electricity.

[0019] Furthermore, the aforementioned heat exchange cooling power generation device may not require the installation of a wind turbine and may only be used for cooling.

[0020] Furthermore, the wind duct can be of various shapes, including cylindrical and square; the wind duct can have one or more air inlets; and the wind duct can have one or more air outlets.

[0021] Furthermore, the airflow in the aforementioned cooling and power generation device, which involves a wind duct, can also be regulated by a flow control valve.

[0022] Furthermore, the heat exchange cooling power generation device has a smaller top diameter and a larger bottom diameter in the wind duct, forming an acceleration channel (Venturi effect) to further increase the airflow speed.

[0023] Furthermore, in the aforementioned cooling and power generation device, the heat exchanger is placed inside the wind duct, where heat energy is exchanged with the air inside the wind duct, and the heated air flows upward inside the wind duct.

[0024] Furthermore, the heat exchanger involved in the aforementioned cooling and power generation device can be various types of heat exchangers, preferably plate heat exchangers, finned heat exchangers, spiral heat exchangers, and coil heat exchangers, etc.; fins can be used to enhance heat exchange and cooling, thereby increasing the temperature difference and wind speed of the wind duct.

[0025] Furthermore, in the aforementioned cooling and power generation device, the heat exchanger is preferably conical, with the hot fluid entering the conical heat exchanger from the top and exiting from the bottom. For example, a coil heat exchanger is smaller at the top and larger at the bottom, and its side view is conical.

[0026] Furthermore, in the aforementioned cooling and power generation device, the heat exchanger inside the chimney can be one or more; for example, a small conical heat exchanger can be nested inside a large conical heat exchanger.

[0027] Furthermore, in the aforementioned heat exchange and cooling power generation device, the heat exchanger can also be a material conveyor, material conveyor belt, dryer, or radiator, etc. The hot material inside the chimney heats up the internal air, enhances airflow and cools the material, thus achieving the same effect of heat exchange, cooling and power generation.

[0028] Furthermore, the heat exchangers involved in the aforementioned heat exchange and cooling power generation device can all be finned to enhance heat exchange and cooling, and can all be conical, thereby increasing airflow velocity and power generation efficiency.

[0029] Furthermore, the heat exchange and cooling power generation device involves energy storage equipment used to store electricity generated by wind turbines, including batteries, compressed air energy storage, ammonia energy storage, hydrogen energy storage, and thermal energy storage equipment; the energy storage equipment is selected from battery energy storage, phase change energy storage, sensible heat (molten salt) energy storage, chemical energy storage, mechanical energy storage, compressed air energy storage, ammonia energy storage, hydrogen energy storage, chemical thermal energy storage, and reservoir energy storage, etc.

[0030] Furthermore, the energy storage technology equipment can use hydrogen energy storage, that is, using the electricity generated by the wind turbine to electrolyze water to produce hydrogen, thus completing energy storage, and the hydrogen is burned to provide heat energy.

[0031] Furthermore, the energy storage technology device described above can both store and release energy; the energy storage device can supply thermal energy as well as electrical energy.

[0032] Furthermore, the heat exchange power generation device also includes an intelligent control system to ensure the safe and efficient operation of the system.

[0033] The novelty of this invention lies in its integration of a heat exchanger, chimney, and wind turbine to achieve cooling and temperature reduction while simultaneously generating green electricity. It involves multiple disciplines, including the chimney effect, heat exchange principles, fluid mechanics, mechanical design, intelligent control, wind power generation, and energy storage technology, achieving both cooling and zero-carbon energy generation. It utilizes energy storage technology to address the issues of wind power storage and the spatial and temporal differences between energy and users. It represents an integration of multiple technologies. The conical heat exchange structure enhances heat exchange efficiency and wind power. The technical advantages of this invention include: ① Waste heat recovery and reuse, where various types of waste heat heat the air to generate airflow and electricity, turning waste into treasure; ② High stability, with the chimney effect less affected by weather, allowing for continuous green energy generation; ③ Replacement of various cooling towers, especially water cooling towers; energy and water conservation; ④ Wide range of applications. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the cooling and power generation device of the present invention.

[0035] As shown in the figure: 1. Wind duct or chimney; 2. Air inlet; 3. Wind turbine; 4. Heat exchanger; 5. Air outlet.

[0036] Figure 2 This is a schematic diagram of a heat exchanger related to the cooling and power generation device of the present invention.

[0037] As shown in the figure: 1. Heat exchange pipe; 2. Support; 3. Hot fluid inlet; 4. Fluid outlet; 5. Fluid pipe; 6. Connecting fluid pipe.

[0038] Figure 3 This is a schematic diagram of a heat exchanger related to the cooling and power generation device of the present invention.

[0039] As shown in the figure: 1. Hot fluid inlet; 2. Support; 3. Heat exchange pipe; 4. Fluid outlet.

[0040] Figure 4 This is a schematic diagram of a heat exchanger related to the cooling and power generation device of the present invention.

[0041] As shown in the figure: 1. Material tray; 2. Support or rotating shaft; 3. Material outlet. Detailed Implementation

[0042] In practical implementation, the turbine of the wind turbine is installed inside the wind duct, at the air inlet, or at the air outlet, so that the wind efficiently drives the turbine to rotate. The rotation of the turbine drives the generator to generate electricity. The generated electricity can be used directly or stored in an energy storage device. The stored energy is released to users when needed. Heat exchangers, material conveyors, material conveyor belts, dryers, and radiators are placed inside the wind duct to heat the air inside the duct, accelerate airflow, enhance power generation, and promote cooling. To make the content of this invention clearer and more understandable, the technical solutions in the embodiments of this invention are clearly and completely described below with reference to the accompanying drawings.

[0043] Example 1, Combined with appendix Figure 1 In specific implementations of this invention: The thermal power plant generates a large amount of wastewater at approximately 40 degrees Celsius daily. This wastewater enters a conical finned coil heat exchanger, where it exchanges heat with air to produce hot air that enters a 10-meter-high duct. Two 5 kWh wind turbines are installed at the top of the duct, generating approximately 9.8 kW of electricity per hour. This electricity is fed into the power grid. This heat exchanger and chimney combination unit replaces the previously used cooling tower, saving electricity and eliminating the waste of cooling water.

[0044] Example 2, Combined with appendix Figure 1 and Figure 3 In specific implementations of this invention: Oilfield wastewater, at approximately 50 degrees Celsius, enters a finned spiral tube heat exchanger. The chimney is 15 meters high, and a 2 kWh turbine wind turbine is installed at the bottom of the chimney. The wastewater is cooled to 34 degrees Celsius, generating approximately 45 kWh of electricity per day. This electricity is used to heat crude oil, saving on natural gas.

[0045] Example 3, Combined with appendix Figure 1 In specific implementations of this invention: The bricks, emerging from the kiln at approximately 120 degrees Celsius, are conveyed into the chimney by a conveyor belt, where their temperature drops to about 33 degrees Celsius. The chimney is 15 meters high, and two 3 kWh turbine wind turbines are installed at the bottom and middle of the chimney, generating approximately 120 kWh of electricity per day. This electricity is stored in a chemical thermal storage device and then used to generate steam. This steam is then supplied to the garment factory for drying clothes, achieving zero-carbon production and saving approximately 600 yuan in steam costs per day.

[0046] Example 4, Combined with appendix Figure 1 In specific implementations of this invention: A cooling tower used to consume 2,700 kWh of electricity and 16,000 tons of cooling water daily. By replacing it with a plate heat exchanger and a 20-meter-high chimney, along with battery energy storage, the water and electricity consumption became zero. Two 5 kWh wind turbines were installed at the bottom of the chimney and one in the middle, generating approximately 1,600 kWh of green electricity daily.

[0047] Example 5, Combined with appendix Figure 1 In specific implementations of this invention: A pharmaceutical factory discharges wastewater at approximately 90 degrees Celsius after using steam. The temperature drops to approximately 32 degrees Celsius after flowing through a spiral tube heat exchanger, which is placed at the bottom of a 20-meter-high chimney. Two 3 kWh turbine wind turbines are installed at the air inlet at the bottom of the chimney. The factory generates approximately 255 kW of electricity per day. The generated electricity is stored using calcium-based chemical thermal storage technology and then used to generate steam. The steam is then fed into the pipeline network, saving approximately 600,000 yuan in steam costs annually.

[0048] Example 6, Combined with appendix Figure 1 In specific implementations of this invention: The photovoltaic equipment generates hot water at approximately 60 degrees Celsius. This hot water is then heated by a finned heat exchanger to produce hot air. This hot air generates an airflow of approximately 17 m / s within the vertical wind turbine duct. Two 3 kWh turbine wind turbines are installed inside the wind turbine duct. The wind turbines generate approximately 140 kWh of electricity per day, which is then connected to the grid.

[0049] Example 7, Combined with appendix Figure 1 and 4 In specific implementations of this invention: A feed mill produces 10 tons of feed per hour at approximately 55 degrees Celsius. The feed is fed into a rotating spiral cooling plate, flowing downwards as the plate rotates. After exiting the plate, the temperature drops to 28 degrees Celsius before being bagged. The hot air generated by the heat exchange creates an airflow of approximately 20 m / s within a vertical wind turbine duct. Two 5 kWh wind turbines are installed inside the duct, generating approximately 80 kW of electricity daily. This electricity is directly used to drive the motors, resulting in corresponding savings in electricity costs.

[0050] Example 8, Combined with appendix Figure 1 In specific implementations of this invention: A factory generates wastewater of about 40 degrees Celsius daily. The wastewater enters a conical finned coil heat exchanger, where it exchanges heat with the air to generate hot air. This hot air then enters a 15-meter-high duct with a wind speed of 18 meters per second, and the temperature is reduced to 27 degrees Celsius before being discharged.

[0051] The above embodiments are only used to illustrate the technical features and applications of the present invention, and are not intended to limit the scope of the present invention. Any technical modifications or substitutions made within the principles and claims of the technical solutions involved in the present invention fall within the technical scope of the present invention.

Claims

1. A cooling and power generation device, characterized in that: the device mainly consists of a heat exchanger, a wind turbine duct, a wind turbine generator, and an energy storage device; the heat exchanger and the wind turbine generator are placed inside the wind turbine duct, the heat exchanger heats the air inside the wind turbine duct to generate wind, the wind drives the wind turbine generator to generate electricity and promote heat exchange, and the energy storage device stores the electricity generated by the wind turbine generator for reuse.

2. The cooling and power generation device according to claim 1, characterized in that: the device mainly consists of a heat exchanger, a wind duct, and a wind turbine; the heat exchanger and the wind turbine are placed inside the wind duct, the heat exchanger heats the air inside the wind duct to generate wind, and the wind drives the wind turbine to generate electricity and promote heat exchange.

3. The cooling and power generation device according to claim 1, characterized in that: the device mainly consists of a heat exchanger and a wind duct; the heat exchanger is placed inside the wind duct, the heat exchanger heats the air inside the wind duct to generate wind, and the wind promotes heat exchange.

4. The cooling and power generation device according to claims 1, 2 and 3 is characterized in that: the heat exchanger is selected from various heat exchange devices and can be used for air cooling, with finned heat exchangers being preferred to enhance heat exchange.

5. The heat exchanger according to claims 1, 2, 3 and 4, characterized in that: The preferred shape for heat exchangers is a conical structure.

6. The heat exchanger according to claims 1, 2 and 3, characterized in that: Material conveyors, material conveyor belts, dryers, and heat exchange plates can be used to replace heat exchangers, sending hot materials into air ducts to complete heat exchange and cooling.

7. The cooling power generation device according to claim 1, wherein the energy storage device is selected from electric energy storage devices, thermal energy storage devices, compressed air energy storage devices, ammonia energy storage devices, and hydrogen energy storage devices.

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