Industrial waste heat power generation system and method

Abstract

The present invention discloses an industrial waste heat power generation system and method, which is applicable to various industrial fields, especially to the heat energy recovery, conversion and utilization system of low-grade heat in coal-fired power plants / thermal power plants and gas-fired power plants. There are a large number of low-grade heat sources in the system. The present invention utilizes the calorific value of the low-grade heat source to heat the ambient air in one or a group of wind energy towers, so that the internal energy of the air increases due to the heat. When the air with increased internal energy is discharged from the wind energy tower, it drives the rotating impeller to convert the internal energy of the air into mechanical kinetic energy. The rotating impeller drives the wind turbine to generate electricity, thereby converting the mechanical energy into electrical energy.

Description

Technical Field

[0001] The invention relates to waste heat recovery, and in particular to an industrial waste heat power generation system and method. Background Art

[0002] At present, whether it is coal-fired thermal power plants, coal-fired thermal power plants, gas-fired power plants, waste incineration power plants, steel mills, aluminum plants, chemical plants, paper mills, glass plants, brick kiln plants and other industrial fields, there is a long-term phenomenon of large amounts of low-grade heat being discarded, or a small amount of recycling is limited to use within the plant area and it is impossible to transport this part of the energy to the outside for long-distance use and convert it into economic value.

[0003] In addition, if the industrial heat source exists in gaseous form, it usually contains a certain amount of pollutants, such as SO2, SO3, HCl, HF, NOx, ammonia, Hg and other heavy metals, soluble salts, fine dust, aerosols, etc., and the pollutants must be removed while recovering the heat.

[0004] Therefore, those skilled in the art are committed to developing an industrial waste heat power generation system and method. Summary of the invention

[0005] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide an industrial waste heat power generation system and method.

[0006] To achieve the above-mentioned purpose, the present invention first provides an industrial waste heat power generation system, including a waste heat conversion subsystem, a circulating water subsystem and a wind energy tower subsystem; wherein the waste heat conversion subsystem includes a heat exchange tower, in which a waste heat exchanger is arranged; the waste heat exchanger includes a cold water inlet and a hot water outlet, and the cold water inlet and the hot water outlet are respectively connected to the cold water pipe and the hot water pipe of the circulating water subsystem; the wind energy tower subsystem includes a wind energy tower, and the wind energy tower is connected to the cold water pipe and the hot water pipe of the circulating water subsystem; a wind energy heat exchanger, an impeller and a generator are arranged in the tower body of the wind energy tower, and a heat source inlet and a heat source outlet are arranged on the wind energy heat exchanger, and the heat source inlet is connected to the hot water pipe of the circulating water subsystem, and the heat source outlet is connected to the cold water pipe of the circulating water subsystem.

[0007] Furthermore, an induced draft fan is also arranged in the wind energy tower, and the induced draft fan, wind energy heat exchanger, impeller and generator in the tower body of the wind energy tower are arranged vertically from bottom to top. Furthermore, the wind energy tower body air outlet is arranged in the horizontal direction, and the impeller and generator are also arranged on the side of the tower body accordingly.

[0008] Furthermore, an environmental protection device is provided in the heat exchange tower.

[0009] Furthermore, the environmental protection device includes one or a combination of a spray desulfurization device, a demister, a heat exchanger, a condensation dust collector, and a submicron separator.

[0010] Furthermore, a condensing dust collector is provided in the heat exchange tower, and the condensing dust collector also serves as a waste heat exchanger and is connected to the cold water pipe and the hot water pipe of the circulating water subsystem.

[0011] Furthermore, the condensing dust collector is a hollow heat exchange dust collector.

[0012] Furthermore, the cross-sectional shape of the heat exchange element of the hollow heat exchange type dust collector is a circular tube type, a small wave corrugated plate type, a large wave corrugated plate type, a straight plate type, a water drop type or an ellipse type.

[0013] Furthermore, the hollow heat exchange type dust collector is made of polypropylene, graphene polymer material, fluoroplastic, 2205 alloy, 316L, 1.4529 alloy or Hastelloy.

[0014] Furthermore, a water collecting and draining device is provided at an upstream or downstream position of the demister, the condensation dust collector and the submicron separator.

[0015] Furthermore, the wind energy tower subsystem includes a wind energy tower group, one wind energy tower group corresponds to the heat source of one unit / unit, and multiple wind energy tower groups correspond to the heat sources of multiple units / units. Each wind energy tower or wind energy tower group can be started and stopped independently.

[0016] Furthermore, the heat exchange element of the wind energy heat exchanger is made of aluminum material, copper material, carbon steel material, stainless steel material, alloy material, graphene polymer material or fluoroplastic material.

[0017] Furthermore, the size of the hot air outlet in the wind energy tower is adjustable.

[0018] The present invention also provides an industrial waste heat power generation system, comprising a waste heat input subsystem, a circulating water subsystem and a wind power tower subsystem; wherein the waste heat input subsystem comprises a heat source carrier inlet and a heat source carrier outlet; the heat source carrier inlet and the heat source carrier outlet are respectively connected to the cold water pipe and the hot water pipe of the circulating water subsystem; the wind power tower subsystem comprises a wind power tower, and the wind power tower is connected to the cold water pipe and the hot water pipe of the circulating water subsystem; a wind power heat exchanger, an impeller and a generator are arranged in the tower body of the wind power tower, and a heat source inlet and a heat source outlet are arranged on the wind power heat exchanger, the heat source inlet is connected to the hot water pipe of the circulating water subsystem, and the heat source outlet is connected to the cold water pipe of the circulating water subsystem.

[0019] Furthermore, an induced draft fan is also arranged in the wind energy tower, and the induced draft fan, wind energy heat exchanger, impeller and generator in the tower body of the wind energy tower are arranged vertically from bottom to top.

[0020] Further, the waste heat input subsystem includes a plate heat exchanger, and the plate heat exchanger is connected to the heat source carrier inlet and the heat source carrier outlet.

[0021] The present invention also provides an industrial waste heat power generation method, in which the carrier of industrial waste heat is gaseous, and the gaseous waste heat carrier first enters the waste heat conversion subsystem of the industrial waste heat power generation system from below, and the waste heat conversion subsystem includes a heat exchange tower; after the gaseous waste heat carrier enters the heat exchange tower, it exchanges heat with the waste heat exchanger arranged in the heat exchange tower during the rising process, and the waste heat exchanger is connected to the circulating water subsystem, and the cold water in the circulating water subsystem passes through the cold water pipe of the circulating water subsystem and enters the waste heat exchanger through the cold water inlet, and the hot water obtained by the cold water exchanging heat with the gaseous waste heat carrier in the waste heat exchanger passes through the hot water outlet and the hot water pipe into the circulating water subsystem after the heat exchange The gaseous waste heat carrier continues to rise and finally flows out through the outlet of the heat exchange tower; the hot water entering the circulating water subsystem flows into the wind energy tower subsystem, which includes a wind energy tower. A wind energy heat exchanger, an impeller and a generator are arranged in the tower body of the wind energy tower. A heat source inlet and a heat source outlet are arranged on the wind energy heat exchanger. The hot water from the circulating water subsystem passes through the hot water pipe and enters the wind energy heat exchanger through the heat source inlet for heat exchange, and then flows out from the heat source outlet and returns to the cold water pipe. When the wind energy tower is working, the induced draft fan is started to introduce outside air. The air is heated and pressurized in the wind energy heat exchanger through heat exchange with hot water, and then drives the impeller to rotate at the air outlet of the wind energy tower. The impeller drives the generator rotor to realize the conversion of mechanical energy into electrical energy.

[0022] Furthermore, an induced draft fan is also arranged in the wind energy tower, and the induced draft fan, wind energy heat exchanger, impeller and generator in the tower body of the wind energy tower are arranged vertically from bottom to top.

[0023] Furthermore, the gaseous waste heat carrier is industrial hot air.

[0024] Furthermore, the gaseous waste heat carrier is industrial flue gas.

[0025] Furthermore, the industrial flue gas is the flue gas emitted from a coal-fired power plant or the clean flue gas behind the dry desulfurization tower of the tail gas of a coal-fired boiler, a gas boiler, or a waste incineration boiler.

[0026] Furthermore, an environmental protection device is also provided in the heat exchange tower of the waste heat conversion subsystem.

[0027] Furthermore, the environmental protection device includes one or a combination of a spray desulfurization device, a demister, a heat exchanger, a condensation dust collector, and a submicron separator.

[0028] Furthermore, a condensing dust collector is provided in the heat exchange tower, and the condensing dust collector also serves as a waste heat exchanger and is connected to the cold water pipe and the hot water pipe of the circulating water subsystem.

[0029] Furthermore, the volume content of gaseous water in the gaseous waste heat carrier is not less than 3%, and the temperature is not less than 5° C. higher than the ambient temperature.

[0030] The present invention also provides an industrial waste heat power generation method, the carrier of industrial waste heat is liquid, the liquid waste heat carrier first enters the waste heat input subsystem, the waste heat input subsystem includes a heat source carrier inlet and a heat source carrier outlet; the heat source carrier inlet and the heat source carrier outlet are respectively connected to the cold water pipe and the hot water pipe of the circulating water subsystem; the liquid waste heat carrier flows into the wind energy tower subsystem through the circulating water subsystem, the wind energy tower subsystem includes a wind energy tower, the liquid waste heat carrier enters the wind energy heat exchanger for heat exchange and then returns to the heat source carrier outlet, when the wind energy tower is working, the induced draft fan is started to introduce outside air, the air is heated and pressurized in the wind energy heat exchanger through heat exchange with hot water, and then drives the impeller to rotate at the air outlet of the wind energy tower, and the impeller drives the generator rotor to realize the conversion of mechanical energy into electrical energy.

[0031] Furthermore, the liquid waste heat carrier first enters the waste heat input subsystem and exchanges heat with the plate heat exchanger in the waste heat input subsystem, and the plate heat exchanger is then connected to the heat source carrier inlet and the heat source carrier outlet.

[0032] The present invention actually provides a heat recovery and conversion utilization system and method that integrates pollutant environmental protection treatment, wastewater environmental protection treatment, water recovery, and wind energy utilization. Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) Converting the calorific value of long-term, large-scale, and abandoned low-grade heat sources into clean wind power energy, which can be transmitted over long distances or used as local electricity, has great economic and social benefits and promotes carbon emission reduction.

[0034] (ii) In the process of extracting heat from low-grade heat sources, the pollutants SO2 and fine particles (i.e. dust) in the boiler exhaust gas are further removed, and at the same time, the pollutants such as soluble salts, aerosol SO3, heavy metal Hg, etc. in the clean flue gas can be reduced.

[0035] (III) Since clean flue gas is usually saturated wet flue gas, when the flue gas temperature drops, it will inevitably precipitate a large amount of condensed water, thus saving water for the power plant. A large amount of gaseous water is contained in the clean flue gas, which has been discarded in the atmosphere as waste. After the power plant implements waste heat power generation, a large amount of water can be recovered. For example, when the clean flue gas of a 600MW unit drops from 50℃ to 40℃, 110t / h of water can be recovered. The return water will greatly improve the economic and social effects of the power plant.

[0036] (iv) After the saturated wet flue gas is cooled, the water content (gaseous) in the flue gas drops significantly. The lower the water content, the lighter the smoke plume discharged from the chimney. In good weather, there is almost no white smoke plume. The white smoke plume phenomenon can also be controlled by appropriately raising the temperature of the clean flue gas after cooling before discharging it.

[0037] (V) Part of the heat extracted from the clean flue gas can be used to concentrate and evaporate the wastewater in the factory area, which is beneficial to wastewater treatment.

[0038] (VI) The calorific value of flue gas from coal-fired power plants, coal-fired thermal power plants, gas-fired power plants and other coal-fired or gas-fired boilers is huge. For example, a 600MW coal-fired unit emits about 2 million Nm 3 / h, the exhaust temperature is about 50℃, and the net flue gas of wet desulfurization (currently the mainstream desulfurization process in domestic power plants) is saturated wet flue gas, that is, the cooling of flue gas is accompanied by the phase change process of gaseous water in the flue gas, which changes from condensation of gaseous water to liquid, which will release huge calorific value. Assuming that it drops from 50℃ to 40℃, the total calorific value including sensible heat and latent heat of phase change is theoretically released. More than 80MW; for gas units, the exhaust temperature is higher, about 80℃, and the calorific value contained in the unit volume of flue gas is greater. The heat source changes slowly and is almost synchronized with the peak of social electricity consumption. The load change of the boiler is an expected and regular change, usually high during the day and low at night. Therefore, if the waste heat of the net flue gas of desulfurization is used for power generation, it is almost synchronized with social electricity consumption. The waste heat of the high-load boiler during the day is also in the peak period with high power generation, and the waste heat of the low-load boiler at night is also in the low peak period with low power generation. Therefore, the waste heat wind power generation in this application scenario is very suitable for market needs. The annual utilization hours are high. At present, the average utilization hours of domestic boilers are 4,200 to 8,000 hours, which is much higher than the average utilization hours of wind power generation in nature, which is 1,000 to 2,500 hours. The electricity generated by waste heat power generation can be sent to the society or used locally. Usually, the power consumption of coal-fired power plants accounts for about 10%. If wind power is used locally, the power plant can have more electricity transmitted to the power grid. If the country implements the conversion of waste heat from desulfurized exhaust gas into wind power generation, according to the current annual consumption of 3 billion tons of coal in the country, at least 150 million tons of coal can be saved annually while providing the same power generation.

[0039] (VII) Compared with natural onshore wind power or offshore wind power, the unit kilowatt investment cost (investment amount / KW) of waste heat power generation is low, and the annual utilization hours (hours / year) of waste heat power generation is high, and the project cycle is short and the effect is quick. Whether it is onshore wind power or offshore wind power projects, the construction period is very long.

[0040] (VIII) The present invention can be applied not only to coal-fired thermal power plants, but also to coal-fired thermal power plants, gas-fired power plants, waste incineration power plants, steel mills, aluminum plants, chemical plants, paper mills, glass plants, brick kiln plants, and other industrial fields. As long as there is a surplus, basically stable, and considerable amount of low-grade heat source, these calorific values ​​can be converted into wind power generation to achieve waste heat reuse.

[0041] (IX) The present invention is safe and reliable, and has no major hidden dangers in production safety.

[0042] Although the number of wind energy towers in the present invention is large and the area occupied is large, it is completely feasible to implement the conversion of waste heat or part of the waste heat into wind power generation for newly built power plants or plants with sufficient site space. It is also feasible to install wind energy towers at high altitudes by elevating them through steel structures, or to find a suitable site near the heat source to arrange the wind energy tower group, but in this case the heat loss of the circulating water system will increase slightly.

[0043] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the principle of a gaseous heat source industrial waste heat power generation system in a preferred embodiment of the present invention;

[0045] Figure 2 It is a schematic diagram of the structure of a wind energy tower in a preferred embodiment of the present invention;

[0046] Figure 3 is a schematic diagram of the structure of a wind energy tower in another preferred embodiment of the present invention;

[0047] Figure 4 It is a schematic diagram of the principle of a gaseous heat source industrial waste heat power generation system in another preferred embodiment of the present invention;

[0048] Figure 5 It is available for Figure 4 A schematic diagram of a tubular demister in an embodiment of ;

[0049] Figure 6 It is available for Figure 4 A schematic diagram of a flat plate demister in an embodiment of;

[0050] Figure 7 It is available for Figure 4 A schematic diagram of a roof demister in an embodiment of;

[0051] Figure 8 It is available for Figure 4 A schematic diagram of a horizontal flue demister in an embodiment of the invention;

[0052] Fig. 9 It is available for Figure 4 A schematic diagram of a separation element of a demister in an embodiment of the present invention;

[0053] Fig.10 It is available for Figure 4 A schematic diagram of a hollow condensing dust removal and mist eliminator in an embodiment of the present invention;

[0054] Fig.11 It is available for Fig.10 Schematic diagram of dust removal and mist removal components of hollow condensing dust removal and mist removal device;

[0055] Fig.12 It is available for Figure 4 A schematic diagram of a water collector in an embodiment of the present invention;

[0056] Fig.13 It is available for Fig.12 A schematic diagram of a water collecting element of a water collector in an embodiment of the present invention;

[0057] Fig.14 It is a schematic diagram of the principle of a liquid heat source industrial waste heat power generation system in another preferred embodiment of the present invention;

[0058] Fig.15 It is a schematic diagram of the principle of a liquid industrial waste heat power generation system in another preferred embodiment of the present invention; DETAILED DESCRIPTION

[0059] The following describes several preferred embodiments of the present invention with reference to the drawings in the specification, so that the technical content is clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0060] In such Figure 1 In the embodiment described, the carrier of industrial waste heat is industrial hot air, such as cooling air of various air-cooled industrial equipment. The hot air first enters the waste heat conversion subsystem 100 of the industrial waste heat power generation system according to the present invention from below. The waste heat conversion subsystem 100 includes a heat exchange tower 10. After the hot air enters the heat exchange tower 10, it exchanges heat with the waste heat exchanger 11 arranged in the heat exchange tower 10 during the rising process. The waste heat exchanger 11 is connected to the circulating water subsystem 300. The cold water in the circulating water subsystem 300 passes through the cold water pipe 30 of the circulating water subsystem 300 and enters the waste heat exchanger 11 through the cold water inlet. The hot water obtained by the cold water being heated up by heat exchange with the hot air in the waste heat exchanger 11 passes through the hot water outlet and the hot water pipe 31 and enters the circulating water subsystem 300. The hot air after heat exchange in the waste heat exchanger 11 continues to rise and finally flows out through the outlet of the heat exchange tower 10.

[0061] Next, the hot water entering the circulating water subsystem 300 flows into the wind energy tower subsystem 200. The wind energy tower subsystem 200 includes a plurality of wind energy towers 20. According to the flow path of the hot water, the plurality of wind energy towers 20 can be connected in series and / or in parallel with each other. After the hot water is heat exchanged in the wind energy tower 20, it returns to the condensing heat exchanger 11 through the cold water pipe 30, completing a cycle.

[0062] The wind energy tower is a device that converts the calorific value of circulating water into wind energy. Figure 2 An embodiment of a wind energy tower 20 according to the present invention is shown. An induced draft fan 22, a wind energy heat exchanger 23, an impeller 24 and a generator 25 are vertically arranged from bottom to top in a tower body 21 of the wind energy tower 20. A heat source inlet and a heat source outlet are arranged on the wind energy heat exchanger 23. Figure 1 In the embodiment, the hot water of the circulating water subsystem 300 enters the wind energy heat exchanger 23 through the heat source inlet through each branch of the hot water pipe 31 for heat exchange, and then flows out from the heat source outlet and returns to the cold water pipe 30. When the wind energy tower 20 is working, the induced draft fan 22 is started to introduce ambient air from below. After the air is heated and pressurized by heat exchange with hot water in the wind energy heat exchanger 23, the air at the outlet of the wind energy tower forms a strong wind to drive the impeller 24 to rotate, and the impeller 24 drives the rotor of the generator 25 to realize the conversion of mechanical energy into electrical energy.

[0063] Figure 3 Another embodiment of a wind energy tower 20 according to the present invention is shown. In this embodiment, the wind energy tower 20 has a tower body 21 with an air outlet different from Figure 1 The impeller 24 and the generator 25 are arranged on the side of the tower body 21.

[0064] In such Figure 4 In the embodiment of the industrial waste heat power generation system according to the present invention shown, the waste heat carrier is industrial flue gas, such as the flue gas emitted from a coal-fired power plant. The flue gas from a power plant is generally saturated wet flue gas, with a flue gas temperature of about 50°C and a gaseous water content of about 12%. At this time, on the one hand, the flue gas contains a huge calorific value, and the latent heat of water is the main one, so the flue gas is cooled by circulating cooling water, and the water in the flue gas will precipitate the huge latent heat it contains during the condensation process; on the other hand, the flue gas also contains a large amount of pollutant components, such as SO2, SO3, HCl, HF, NOx, ammonia, Hg and other heavy metals, soluble salts, fine dust, etc., which need to be removed while recovering heat energy. Therefore, in this embodiment, a spray desulfurization device, a dust removal and demisting device and other environmental protection devices are also provided in the heat exchange tower 10 of the waste heat conversion subsystem 100. Specifically, Figure 4As shown, in this embodiment, a spray desulfurization device 12, a mist eliminator 13, a condensation dust collector 14 and a submicron separator 15 are arranged from bottom to top in the heat exchange tower 10. Among them, the dust removal function of the condensation dust collector 14 is to use the phase change principle. When the gaseous water is condensed and converted into liquid water, the pollutants in the clean flue gas will be used as condensation nuclei. After the pollutants are covered by the condensed water, they will condense and grow rapidly, and the larger the particles are, the easier they are to be intercepted and separated. In addition, the gaseous water will also release a large amount of latent heat when condensing. Therefore, the condensation dust collector 14 connected to the circulating water subsystem 300 also has the function of taking heat from the flue gas heat source through the circulating water. The cold water in the circulating water subsystem 300 enters the condensation dust collector 14 through the cold water pipe 30 of the circulating water subsystem 300 through the cold water inlet. The hot water obtained by the cold water in the condensation dust collector 14 after the heat exchange with the flue gas is heated up through the hot water outlet and the hot water pipe 31 into the circulating water subsystem 300. After the flue gas passes through the heat exchange tower 10 for spray desulfurization, dust removal and demisting, and heat exchange, it is discharged into the chimney 16. The waste heat released by the flue gas is the same as in the above embodiment, and flows into the wind energy tower subsystem 200 through the hot water entering the circulating water subsystem 300 for power generation. In this embodiment, the demister 13 can be as follows: Figure 5 The tubular demister 131 shown (where (a), (b), and (c) are respective views), Figure 6 The flat plate demister 132 shown, Figure 7 The roof demister 133 shown or Figure 8 One or more demister devices in the horizontal flue demister 134 shown, each demister can be one or more stages. The separation element of the demister can be used as Fig. 9 The condenser dust collector 14 may be one of the forms (a), (b), (c), (d) or a combination thereof. Fig.10 The hollow condensing dust removal and mist removal device shown in FIG. Fig.11 One of the forms shown or a combination thereof, as shown in (a), (b), (c), (d), (e) and (f) in the figure, the cross-section can be circular, elliptical, small wave corrugated, large wave corrugated, straight plate and other suitable shapes, etc. Under the same operating conditions, the resistance that needs to be overcome by unit volume of air to obtain the same amount of heat is low. It is preferably a small wave corrugated heat exchanger with low air flow resistance and large heat exchange surface. The flow state of air and water is conducive to heat exchange. A water collection and drainage device is provided upstream or downstream of the demister, condensation dust collector and submicron separator. Among them, the water collection device can be as follows Fig.12 The water collecting element of the water collector can be made of Fig.13The form shown. In this embodiment, while the heat exchange tower 10 removes various pollutants, the temperature of the clean flue gas decreases, and the gaseous water therein condenses to precipitate liquid water, releasing a large amount of latent heat for waste heat recovery. In addition, the condensed water precipitated from the clean flue gas can be used as process water after pH adjustment, and also has the effect of water recovery and water saving. Of course, in actual applications, those skilled in the art can adopt various combinations and system structures of environmental protection devices according to working conditions. The present invention has no intention of limiting this, and its various variations should fall within the scope of the present invention.

[0065] In such Fig.14 In the embodiment of the industrial waste heat power generation system according to the present invention, the waste heat carrier is industrial hot water, such as cooling water of various water-cooled industrial equipment. In this case, the industrial hot water can be directly introduced into the wind energy tower subsystem 200 through a pump and a pipeline system after being filtered to generate electricity. Fig.15 As shown, the industrial hot water is heat exchanged between the heat source water and the circulating water (usually deionized water) through a waste heat exchanger such as a plate heat exchanger, and the circulating water absorbs the heat and is transported to the wind energy tower subsystem 200 to generate electricity.

[0066] Under the action of the induced draft fan, the wind energy tower inhales ambient air from the bottom, and then the air exchanges heat with the circulating water in the wind energy heat exchanger, the air temperature rises to obtain internal energy, and the air flows further upward while overcoming the resistance of the wind energy heat exchanger, and the air temperature continues to rise until it leaves the wind energy heat exchanger. After the air obtains sufficient calorific value, the air temperature and pressure rise, thereby increasing the internal energy. At the top of the wind energy tower, the air outlet can be provided in a ring shape, and the size of the air outlet can be fixed but preferably can be adjusted to adjust the wind speed. The direction of the guide plate of the air outlet can be fixed but preferably can be adjusted to adjust the wind direction, so as to convert the internal energy of the air into air kinetic energy to the greatest extent possible.

[0067] The horizontal cross section of the main body of the wind energy tower is preferably circular, but can also be square, four-cornered circular or polygonal. Along the height direction, the cross section can be gradually changed, which is conducive to making the air flow field in the tower more suitable for wind power generation.

[0068] Wind energy towers are preferably built on the ground. If there are other buildings on the ground and the space is limited, they can be arranged on steel structures or other structures, that is, high-altitude arrangements.

[0069] The inlet for the outside air to flow into the wind energy tower should not be too small. A larger inlet is conducive to reducing the wind energy tower's own resistance. The inlet is preferably arranged around the cross section of the entire wind energy tower. If the wind energy tower is arranged at high altitude, the bottom of the wind energy tower can be empty.

[0070] The function of the induced draft fan is to introduce ambient air outside the tower into the tower, giving the ambient air an initial kinetic energy. Since the function of the induced draft air fan is only to introduce air, and it does not need to bear the power of the upward flow of air in the tower, a low-pressure head fan is preferably used. According to the size of the wind energy tower, the induced draft air fan can be designed as one or more. The induced draft air fan is preferably installed at the bottom of the fan, or it can be installed on the top of the wind energy tower, or it can be installed between the heat exchange tubes of the wind energy heat exchanger. Usually, the heat exchanger is designed with multiple layers of heat exchange tubes.

[0071] To prevent foreign objects or birds from accidentally entering the wind tower, a protective net is installed at the air inlet or on the upstream side of the induced draft fan.

[0072] The heat exchanger inside the wind energy tower can be made of metal materials, such as stainless steel, carbon steel, aluminum, copper, etc. Non-metallic materials can also be used, preferably graphene, polymer materials or fluoroplastic materials with high thermal conductivity. The cross-section of the heat exchange element of the wind energy heat exchanger can be circular, teardrop-shaped, elliptical, linear, small corrugated plate type, large corrugated plate type, etc. An appropriate amount of fins can also be added to the surface of the heat exchange element to improve the heat exchange efficiency.

[0073] Usually, a heat source unit requires a group of wind energy towers to convert the heat value of the unit. A factory area often has multiple heat source units, so multiple groups of wind energy towers can together form a wind power station.

[0074] A hot air outlet fairing can be set above the wind heat exchanger to adjust the air in the tower to a flow field suitable for wind power generation when it is about to be discharged, including the wind force, direction and distribution of wind outlet points. Most of the air is discharged from the outer edge of the wind tower, and the torque driving the fan impeller is greater; the greater the designed outlet wind speed, the higher the dynamic pressure energy of the air and the lower the static pressure energy, and the higher the conversion rate into mechanical energy of the fan impeller; under the same wind force, the outlet wind force needs to be designed to be as close as possible, such as counterclockwise or clockwise rotation; when the heat source changes, in order to ensure that the energy conversion efficiency is at a high state, the outlet size can be dynamically adjusted to adjust the wind tower to the most efficient state for the wind turbine.

[0075] The circulating water subsystem goes back and forth between the cooling tower and the wind energy tower. It consists of a delivery pump, valves, pipes, and various pipe instruments. In order to reduce heat loss, the pipes of the circulating water system should preferably adopt good insulation measures. In principle, the distance between the wind energy tower and the absorption tower is more suitable within the range of 5KM. If the distance is too long, the travel resistance and heat loss of the circulating water system may lead to uneconomical waste heat utilization. Of course, after economic analysis or other reasons, it is possible to exceed 5KM.

[0076] The preferred specific embodiments of the present invention are described in detail above. It should be understood that ordinary technicians in the field can make many modifications and changes based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by technicians in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An industrial waste heat power generation method, characterized in that: The carrier of industrial waste heat is gaseous. The gaseous waste heat carrier first enters the waste heat conversion subsystem of the industrial waste heat power generation system from below. The waste heat conversion subsystem includes a heat exchange tower. After the gaseous waste heat carrier enters the heat exchange tower, it exchanges heat with the waste heat exchanger arranged in the heat exchange tower during the rising process. The waste heat exchanger is connected to the circulating water subsystem. The cold water in the circulating water subsystem passes through the cold water pipe of the circulating water subsystem and enters the waste heat exchanger through the cold water inlet. The cold water is in the waste heat exchanger through the reaction with the gaseous waste heat carrier. The hot water obtained after the heat exchange with the body is heated up through the hot water outlet, through the hot water pipe, and enters the circulating water subsystem. The gaseous waste heat carrier after heat exchange in the waste heat heat exchanger continues to rise, and finally flows out through the outlet of the heat exchange tower; the hot water entering the circulating water subsystem flows into the wind energy tower subsystem, which includes a wind energy tower. A wind energy heat exchanger, an impeller and a generator are arranged in the tower body of the wind energy tower. A heat source inlet and a heat source outlet are arranged on the wind energy heat exchanger. An induced draft fan is also arranged in the wind energy tower. The induced draft fan, wind energy heat exchanger, impeller and generator are arranged vertically from bottom to top; the hot water of the circulating water subsystem passes through the hot water pipe, enters the wind energy heat exchanger through the heat source inlet for heat exchange, and then flows out from the heat source outlet and returns to the cold water pipe. When the wind energy tower is working, the induced draft fan is started to introduce outside air. The air is heated and pressurized by heat exchange with hot water in the wind energy heat exchanger, and then drives the impeller to rotate at the air outlet of the wind energy tower. The impeller drives the generator rotor to realize the conversion of mechanical energy into electrical energy. In the waste heat conversion subsystem Environmental protection devices are also installed in the heat exchange tower of the system; the environmental protection devices include spray desulfurization devices, demisters, condensation dust collectors and submicron separators; water collection and drainage devices are provided upstream or downstream of the demisters, condensation dust collectors and submicron separators; the condensation dust collector is a hollow heat exchange dust collector, which also serves as a waste heat exchanger and is connected to the cold water pipe and hot water pipe of the circulating water subsystem; the volume content of gaseous water in the gaseous waste heat carrier is not less than 3%, and the temperature is not less than 5°C higher than the ambient temperature.

2. The industrial waste heat power generation method according to claim 1, wherein: The gaseous waste heat carrier is industrial hot air.

3. The industrial waste heat power generation method according to claim 1, wherein: The gaseous waste heat carrier is industrial flue gas.

4. The industrial waste heat power generation method according to claim 3, wherein: Industrial flue gas is the flue gas emitted from coal-fired power plants or the clean flue gas behind the dry desulfurization tower of the tail gas of coal-fired boilers, gas boilers, or waste incineration boilers.

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