A rotary kiln flue gas low-temperature waste heat recovery device

Abstract

The application relates to the technical field of flue gas waste heat recovery, and discloses a rotary kiln flue gas low-temperature waste heat recovery device, which comprises a primary recovery chamber, a secondary recovery chamber and a water storage tank, a flue gas inlet pipe is fixedly installed at the left end of the outer wall of the primary recovery chamber, a flue gas connecting pipe one is fixedly installed at the right side of the upper end of the outer wall of the primary recovery chamber, the rear end of the outer wall of the flue gas connecting pipe one is fixedly connected with the front end of the outer wall of the secondary recovery chamber, the temperature of the heat-conducting aluminum sheet one directly contacting the outer wall of the S-shaped flue pipe is increased, the hot end of the thermoelectric sheet can have a constant high temperature, the heat-conducting aluminum sheet two contacting the inner wall of the water pipe one can take away the heat at the heat-conducting aluminum sheet two under the action of the water flowing in the water pipe one, and the cold end is formed, so that a temperature difference is formed between the hot end and the cold end of the thermoelectric sheet, the thermoelectric sheet can generate electricity by utilizing the temperature difference between the high and low temperatures, and the heat energy in the flue gas can be converted into electric energy.

Description

Technical Field

[0001] This invention relates to the field of flue gas waste heat recovery technology, specifically to a low-temperature waste heat recovery device for rotary kiln flue gas. Background Technology

[0002] Over the past decade, due to energy shortages and the further development of energy conservation efforts, various new and energy-efficient advanced furnace types have become increasingly sophisticated. The use of new refractory fibers and other high-quality insulation materials has significantly reduced heat loss from furnaces and kilns. Advanced combustion devices have enhanced combustion, reduced incomplete combustion, and improved the air-fuel ratio. However, progress in technologies to reduce flue gas heat loss and recover waste heat from flue gas has been slow. To further improve the thermal efficiency of kilns and achieve energy conservation and consumption reduction, recovering waste heat from flue gas is also an important energy-saving approach.

[0003] Flue gas is a major source of energy waste in general energy-consuming equipment. For example, boiler exhaust accounts for approximately 15% of energy consumption, while other equipment, such as stenters, dryers, and rotary kilns in the printing and dyeing industry, primarily consume energy through flue gas emissions. Flue gas waste heat recovery mainly involves converting the heat carried by the flue gas into usable heat through some form of heat exchange. Common flue gas energy recovery methods include preheating the air with the heat from the flue gas; however, current air preheating devices often require a large amount of space, or heating water with the heat from the flue gas, turning room-temperature water into high-temperature water. Water provides essential services for people's lives. Hot water heated by flue gas is stored in water tanks. However, the continuous inflow of hot water can generate a large amount of steam, increasing the pressure inside the tank. When the pressure reaches a certain level, it may pose a safety hazard. Meanwhile, existing flue gas low-temperature heat recovery mainly relies on energy conversion between gas and water or gas and liquid. Thermoelectric power generation is a technology that uses the temperature difference between high and low temperature heat sources to generate electricity. Its principle is that due to the stronger thermal excitation effect at the high-temperature end, the electron concentration at this end is higher than that at the low-temperature end. Driven by this carrier concentration gradient, electrons diffuse towards the low-temperature end, thereby forming a potential difference at the low-temperature open circuit end. By connecting many pairs of P-type and N-type thermoelectric conversion materials to form a module, a sufficiently high voltage can be obtained to form a thermoelectric generator. Therefore, we propose a rotary kiln flue gas low-temperature waste heat recovery device. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a low-temperature waste heat recovery device for rotary kiln flue gas, which solves the problems mentioned in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a low-temperature waste heat recovery device for rotary kiln flue gas, comprising a primary recovery chamber, a secondary recovery chamber, and a water storage tank. A flue gas inlet pipe is fixedly installed on the left end of the outer wall of the primary recovery chamber. A flue gas connecting pipe one is fixedly installed on the upper right side of the outer wall of the primary recovery chamber, and the rear end of the outer wall of the flue gas connecting pipe one is fixedly connected to the front end of the outer wall of the secondary recovery chamber. A flue gas connecting pipe two is fixedly connected to the left end of the inner wall of the primary recovery chamber, and the left end of the outer wall of the flue gas connecting pipe two communicates with the right end of the outer wall of the flue gas inlet pipe. An S-shaped flue pipe is fixedly installed on the right end of the outer wall of the flue gas connecting pipe two, and a flue gas connecting pipe three is fixedly installed on the right end of the outer wall of the S-shaped flue pipe, and the upper end of the outer wall of the flue gas connecting pipe three communicates with the flue gas connecting pipe one. The S-shaped flue pipe has heat-conducting aluminum sheets symmetrically fixedly installed on its front and rear sides. On opposite sides of the heat-conducting aluminum sheets 1, thermoelectric generators are fixedly installed. Each thermoelectric generator includes a hot end and a cold end. The hot end of the thermoelectric generator is fixedly connected to the heat-conducting aluminum sheet 1. On opposite sides of the cold ends of the thermoelectric generators on both sides, heat-conducting aluminum sheets 2 are fixedly installed. Insulating blocks are symmetrically fixedly installed in the gaps between the heat-conducting aluminum sheets 1, 2, and 3 on both sides. Water pipes 1 are fixedly installed on the heat-conducting aluminum sheets 2 on both sides and the insulating blocks on both sides. Water pipes 2 are fixedly installed on the upper outer wall of all water pipes 1, and water pipes 2 are fixedly installed on the lower right side of the outer wall of all water pipes 1. Third, a water pipe four is fixedly installed on the lower right side of the inner wall of the primary recovery chamber. The right ends of the outer walls of all three water pipes are connected to the left ends of the outer walls of the four water pipes. A water pipe five is fixedly installed on the lower right side of the outer wall of the primary recovery chamber. A water pipe six is ​​fixedly connected to the left rear end of the outer wall of the primary recovery chamber. The rear end of the outer wall of the six water pipes is fixedly connected to the front end of the outer wall of the secondary recovery chamber. A water inlet pipe is fixedly installed on the upper rear side of the outer wall of the secondary recovery chamber. A flue gas exhaust pipe is fixedly installed on the rear side of the outer wall of the secondary recovery chamber and below the water inlet pipe. An air inlet pipe is fixedly installed on the right side of the outer wall of the secondary recovery chamber. A blower is fixedly installed on the right end of the outer wall of the air inlet pipe. A flue gas heating pipe is fixedly installed on the inner wall of the secondary recovery chamber. An arc-shaped groove is integrally formed on the upper end of the outer wall of the gas heating pipe. A heating water pipe is fixedly installed on the inner wall of the arc-shaped groove. An arc-shaped groove is integrally formed on the lower end of the outer wall of the flue gas heating pipe. An air heating pipe is fixedly installed on the inner wall of the arc-shaped groove. The left front end of the outer wall of the heating water pipe is connected to the rear end of the outer wall of the water pipe six. The right rear end of the outer wall of the heating water pipe is connected to the front end of the outer wall of the water inlet pipe. The right front end of the outer wall of the flue gas heating pipe is connected to the rear end of the outer wall of the flue gas connecting pipe one. The left front end of the outer wall of the flue gas heating pipe is connected to the front end of the outer wall of the flue gas discharge pipe. A booster pump one is fixedly installed in the middle of the water pipe five. The right end of the outer wall of the water pipe five is fixedly connected to the lower left end of the outer wall of the water storage tank. A water storage pipe is fixedly installed on the left end of the inner wall of the water storage tank.A water pump pipe is fixedly installed on the right end of the inner wall of the water storage tank. The water pump pipe passes through the right end of the outer wall of the water storage tank and is fixedly connected to a second booster pump. A hot water outlet pipe is fixedly installed on the right end of the outer wall of the second booster pump.

[0007] Preferably, the insulating block is made of ceramic material, and the insulating blocks on both sides are the same size and shape.

[0008] Preferably, the contact surfaces between the thermoelectric generator and the first and second thermally conductive aluminum sheets on both sides are coated with thermal grease.

[0009] Preferably, a fixed frame is fixedly installed on the upper end of the inner wall of the water storage tank. The fixed frame includes a sliding box, an air circulation box, a power box, and a spring-assisted box. The sliding box is located on the lower right side of the inner wall of the fixed frame. An opening is opened at the lower end of the outer wall of the sliding box. A sliding block is slidably connected to the inner wall of the sliding box. An L-shaped through hole is integrally formed inside the sliding block. A sliding rod is fixedly installed on the upper end of the outer wall of the sliding block. The sliding rod passes through the lower end of the inner wall of the spring-assisted box and the lower end of the inner wall of the power box. Limit blocks are fixedly installed on the right side of the upper and lower ends of the inner wall of the spring-assisted box. A fixing block is fixedly installed on the outer wall of the sliding rod inside the spring-assisted box. A fixing rod is fixedly installed on the front end of the outer wall of the fixing block. A support block is fixedly installed in the middle of the upper and lower ends of the inner wall of the spring-assisted box. A rotating rod is rotatably connected to the front end. A rotating block is fixedly installed on the front end of the outer wall of the rotating rod. A second fixing rod is fixedly installed on the left end of the outer wall of the rotating block. A spring is fixedly installed between the second fixing rod and the first fixing rod. A contact switch is fixedly installed on the right end of the inner wall of the power box. A fixed bracket is fixedly installed on the upper end of the inner wall of the power box. A motor is fixedly installed on the fixed bracket. A drive wheel is fixedly connected to the output end of the motor. A rotating shaft is rotatably connected to the left side of the upper and lower ends of the inner wall of the power box. A fan blade is fixedly installed on the lower end of the outer wall of the rotating shaft, penetrating the lower end of the outer wall of the air circulation box. A driven wheel is fixedly installed on the outer wall of the rotating shaft. The driven wheel is connected to the drive wheel by a belt. A through hole is opened on the lower right side of the inner wall of the air circulation box. An air outlet is opened on the upper end of the outer wall of the air circulation box.

[0010] Preferably, rubber pads are fixedly installed on the left side of both the upper and lower ends of the inner wall of the spring-assisted box.

[0011] Preferably, the switch pressing point of the contact switch is located on the same straight line as the upper end of the outer wall of the sliding rod.

[0012] Preferably, when the sliding rod slides to contact the contact switch, the L-shaped through hole communicates with the straight through hole.

[0013] Preferably, the outer walls of the water pipe, the pumping pipe, and the hot water outlet pipe are all wrapped with insulation sleeves.

[0014] This invention provides a low-temperature waste heat recovery device for rotary kiln flue gas, which has the following beneficial effects:

[0015] (1) When the present invention is in use, the flue gas enters the S-shaped flue pipe from the flue gas connecting pipe 2. The high temperature flue gas flows inside the S-shaped flue pipe, which raises the temperature of the heat-conducting aluminum sheet 1 that is in direct contact with the outer wall of the S-shaped flue pipe. This allows the hot end of the thermoelectric generator to have a constant high temperature and form a hot end. At the same time, the heat-conducting aluminum sheet 2 that is in contact with the inner wall of the water pipe 1 carries away the heat from the heat-conducting aluminum sheet 2 under the action of the flowing water inside the water pipe 1, forming a cold end. This creates a temperature difference between the hot end and the cold end of the thermoelectric generator. The thermoelectric generator will generate electricity by utilizing the temperature difference between the high and low temperatures, thereby converting the heat energy in the flue gas into electrical energy.

[0016] (2) When in use, the present invention can increase the contact area between the flue gas heating pipe and the air heating pipe through the second arc groove, so that the air in the air heating pipe is heated more efficiently. At the same time, the first arc groove can increase the contact area between the heating water pipe and the outer wall of the flue gas heating pipe, thereby improving its heating efficiency. The first arc groove and the second arc groove can improve its heating efficiency by increasing the heating area, thereby reducing the space occupied by the flue gas when preheating the air.

[0017] (3) When the pressure inside the water tank is too high during use, the sliding block will slide upward under the action of the pressure, so that the L-shaped through hole and the straight through hole on the sliding block are aligned, so that the high pressure gas inside the water tank passes through the opening, the L-shaped through hole, the straight through hole and the air circulation box, and finally is discharged from the air outlet. At the same time, the sliding block will drive the sliding rod to slide upward, so that the sliding rod contacts the contact switch, thereby enabling the fan blade to rotate, thereby reducing the pressure inside the water tank and reducing safety hazards. At the same time, when the sliding rod slides upward, it will drive the fixed block to slide upward. Under the action of the spring, the rotating block will swing upward. When the rotating block rotates upward and gets stuck, the spring will give the fixed rod an upward pulling force, so that the upper end of the sliding rod will continue to contact the contact switch, thereby increasing the working time of the motor, improving the efficiency of internal pressure relief of the device, reducing the pressure relief time, and reducing the heat loss of the water tank caused by pressure relief.

[0018] (4) When the present invention is used, the cold water will be heated once in the heating water pipe and then enter the water pipe again for a second heating, so that the heat in the flue gas can be fully utilized. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a top view of the external structure of the present invention;

[0021] Figure 3 This is a front view of the present invention;

[0022] Figure 4 This is a schematic diagram of the internal structure of the primary recycling chamber of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure at point A of the present invention;

[0024] Figure 6 This is a cross-sectional view of the internal structure of the water pipe of the present invention;

[0025] Figure 7 This is a schematic diagram of the internal structure of the secondary recycling chamber of the present invention;

[0026] Figure 8 This is a side view of the internal structure of the flue gas heating pipe of the present invention;

[0027] Figure 9 This is a schematic diagram of the internal structure of the water storage tank of the present invention;

[0028] Figure 10 This is a schematic diagram of the internal structure of the fixed frame of the present invention;

[0029] Figure 11 This is a schematic diagram of the structure at point B of the present invention;

[0030] Figure 12 This is a schematic diagram of the external structure of the sliding block and sliding rod of the present invention.

[0031] In the diagram: 100, Primary recovery chamber; 200, Secondary recovery chamber; 300, Water storage tank; 400, Flue gas inlet pipe; 401, Flue gas connection pipe two; 410, Flue gas connection pipe one; 420, S-shaped flue pipe; 430, Flue gas connection pipe three; 431, Thermally conductive aluminum sheet one; 500, Thermoelectric generator; 501, Insulating block; 510, Hot end of the generator; 520, Cold end of the generator; 530, Thermally conductive aluminum sheet. 2; 540, Water Pipe 1; 550, Water Pipe 2; 560, Water Pipe 3; 570, Water Pipe 4; 600, Water Pipe 5; 610, Booster Pump 1; 700, Water Pipe 6; 710, Water Inlet Pipe; 720, Flue Gas Exhaust Pipe; 730, Air Inlet Pipe; 740, Blower; 800, Flue Gas Heating Pipe; 810, Arc-Shaped Groove 1; 820, Heated Water Pipe; 830, Arc-Shaped Groove 2; 840, Air Pump Heat pipe; 850, water storage pipe; 860, water pump; 870, booster pump II; 880, hot water outlet pipe; 900, fixed frame; 901, sliding box; 902, air circulation box; 903, power box; 904, spring-assisted box; 910, opening; 920, sliding block; 921, L-shaped through hole; 930, sliding rod; 931, limit block; 940, fixed block I; 941, fixed rod I ; 950, Support block; 951, Rubber pad; 960, Rotating rod; 970, Rotating block; 971, Fixed rod two; 980, Spring; 1010, Contact switch; 1020, Fixed bracket; 1030, Motor; 1040, Drive wheel; 1050, Rotating shaft; 1060, Fan blade; 1070, Driven wheel; 1080, Belt; 1090, Straight through hole; 1100, Air outlet. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figure 1-12As shown, the present invention provides a technical solution: a rotary kiln flue gas low-temperature waste heat recovery device, comprising a primary recovery chamber 100, a secondary recovery chamber 200, and a water storage tank 300. A flue gas inlet pipe 400 is fixedly installed on the left end of the outer wall of the primary recovery chamber 100, through which the flue gas in the rotary kiln enters the device. A flue gas connecting pipe 410 is fixedly installed on the upper right side of the outer wall of the primary recovery chamber 100, with the rear end of the outer wall of the first flue gas connecting pipe 410 fixedly connected to the front end of the outer wall of the secondary recovery chamber 200. A second flue gas connecting pipe 401 is fixedly connected to the left end of the inner wall of the primary recovery chamber 100, with the left end of the outer wall of the second flue gas connecting pipe 401 communicating with the right end of the outer wall of the flue gas inlet pipe 400. An S-shaped flue pipe 420 is fixedly installed at the right end. A flue gas connecting pipe 3 430 is fixedly installed at the right end of the outer wall of the S-shaped flue pipe 420. The upper end of the outer wall of the flue gas connecting pipe 3 430 is connected to the flue gas connecting pipe 1 410. Heat-conducting aluminum fins 1 431 are symmetrically fixedly installed on the front and back sides of the outer wall of the S-shaped flue pipe 420. Thermoelectric generators 500 are fixedly installed on the opposite sides of the heat-conducting aluminum fins 1 431 on both sides. Thermoelectric generators 500 include a hot end 510 and a cold end 520. The hot end 510 of the thermoelectric generator 500 is fixedly connected to the heat-conducting aluminum fin 1 431. Heat-conducting aluminum fins 2 530 are fixedly installed on the opposite ends of the cold ends 520 of the thermoelectric generators 500 on both sides. The heat-conducting aluminum fins 1 431, thermoelectric generators 500, and heat-conducting aluminum fins 2 530 are fixedly installed on both sides. Insulating blocks 501 are symmetrically fixedly installed in the gap between the front and rear sides of 530. Water pipes 540 are fixedly installed on the heat-conducting aluminum sheets 530 on both the front and rear sides and the insulating blocks 501 on both the left and right sides. Water pipes 550 are fixedly installed on the upper part of the outer wall of all water pipes 540. Water pipes 560 are fixedly installed on the lower right side of the outer wall of all water pipes 540. Water pipes 570 are fixedly installed on the lower right side of the inner wall of the primary recovery chamber 100. The right side of the outer wall of all water pipes 560 is connected to the left side of the outer wall of water pipe 570. Water pipes 600 are fixedly installed on the lower right side of the outer wall of the primary recovery chamber 100. Flue gas enters the S-shaped flue gas pipe 420 from the flue gas connecting pipe 401. The high-temperature flue gas flows inside the S-shaped flue gas pipe 420, making it circulate with the outer wall of the S-shaped flue gas pipe 420. The temperature of the directly contacting heat-conducting aluminum sheet 431 rises, ensuring a constant high temperature at the hot end of the thermoelectric generator 500, thus forming a hot end. Simultaneously, the heat-conducting aluminum sheet 530, in contact with the inner wall of the water pipe 540, carries away heat under the influence of the flowing water inside the pipe, forming a cold end. This creates a temperature difference between the hot end 510 and the cold end 520 of the thermoelectric generator 500, allowing it to generate electricity. Meanwhile, the water inside the water pipe 540 absorbs heat from the heat-conducting aluminum sheet 531, causing its temperature to rise. A water pipe 700 is fixedly connected to the rear left side of the outer wall of the primary recovery chamber 100.The rear end of the outer wall of water pipe 700 is fixedly connected to the front end of the outer wall of secondary recovery chamber 200. A water inlet pipe 710 is fixedly installed at the upper rear end of the outer wall of secondary recovery chamber 200. A flue gas exhaust pipe 720 is fixedly installed at the rear end of the outer wall of secondary recovery chamber 200, below the water inlet pipe 710. An air inlet pipe 730 is fixedly installed on the right side of the outer wall of secondary recovery chamber 200. A blower 740 is fixedly installed at the right end of the outer wall of air inlet pipe 730. The device uses the blower 740 to blow outside air into the secondary recovery chamber 200 for preheating. A flue gas heating pipe 8 is fixedly installed on the inner wall of secondary recovery chamber 200. The upper end of the outer wall of the flue gas heating pipe 800 has an integrally formed arc-shaped groove 810. A heating water pipe 820 is fixedly installed on the inner wall of the arc-shaped groove 810. The lower end of the outer wall of the flue gas heating pipe 800 has an integrally formed arc-shaped groove 830. An air heating pipe 840 is fixedly installed on the inner wall of the arc-shaped groove 830. The arc-shaped groove 830 increases the contact area between the flue gas heating pipe 800 and the air heating pipe 840, making the heating efficiency of the air in the air heating pipe 840 higher. At the same time, the arc-shaped groove 810 increases the contact area between the heating water pipe 820 and the flue gas heating pipe. The contact area of ​​the outer wall of the 800 is increased to improve its heating efficiency. The left front end of the outer wall of the heating water pipe 820 is connected to the rear end of the outer wall of the water pipe 700. The right rear end of the outer wall of the heating water pipe 820 is connected to the front end of the outer wall of the inlet pipe 710. The right front end of the outer wall of the flue gas heating pipe 800 is connected to the rear end of the outer wall of the flue gas connecting pipe 410. The left front end of the outer wall of the flue gas heating pipe 800 is connected to the front end of the outer wall of the flue gas discharge pipe 720. A booster pump 610 is fixedly installed in the middle of the water pipe 600. The right end of the outer wall of the water pipe 600 is fixedly connected to the lower left end of the outer wall of the water storage tank 300. A water storage pipe 850 is fixedly installed on the left end of the inner wall of the water storage tank 300, and a water pumping pipe 860 is fixedly installed on the right end of the inner wall of the water storage tank 300. The water pumping pipe 860 passes through the right end of the outer wall of the water storage tank 300 and is fixedly connected to a booster pump 870. A hot water outlet pipe 880 is fixedly installed on the right end of the outer wall of the booster pump 870. The heated high-temperature water is pressurized by the booster pump 610 and enters the water storage tank 300 through the water storage pipe 850 for storage. Hot water can be drawn from the water storage tank 300 through the booster pump 870 and the water pumping pipe 860 and discharged from the hot water outlet pipe 880 for people to use.

[0034] Furthermore, the insulating block 501 is made of ceramic material, and the insulating blocks 501 on both sides are the same size and shape. The ceramic material enables the insulating block 501 to have good heat insulation and non-conductive properties.

[0035] Furthermore, the contact surfaces between the thermoelectric generator 500 and the heat-conducting aluminum sheets 431 and 530 on both sides are coated with thermal grease, which can improve the thermal conductivity of both sides of the thermoelectric generator 500.

[0036] Furthermore, a fixed frame 900 is fixedly installed on the upper end of the inner wall of the water storage tank 300. The fixed frame 900 includes a sliding box 901, an air circulation box 902, a power box 903, and a spring-assisted box 904. The sliding box 901 is located on the lower right side of the inner wall of the fixed frame 900. An opening 910 is opened at the lower end of the outer wall of the sliding box 901. A sliding block 920 is slidably connected to the inner wall of the sliding box 901. An L-shaped through hole 921 is integrally formed inside the sliding block 920. A sliding rod 930 is fixedly installed on the upper end of the outer wall of the sliding block 920. The sliding rod 930 passes through the lower end of the inner wall of the spring-assisted box 904 and the lower end of the inner wall of the power box 903. Limit blocks 931 are fixedly installed on the right side of the upper and lower ends of the inner wall of the spring-assisted box 904. The outer wall of the sliding rod 930 is located inside the spring-assisted box 904. A fixed block 940 is fixedly installed. A fixed rod 941 is fixedly installed on the front end of the outer wall of the fixed block 940. A support block 950 is fixedly installed in the middle of the upper and lower ends of the inner wall of the spring booster box 904. A rotating rod 960 is rotatably connected to the front end of the outer wall of the support block 950. A rotating block 970 is fixedly installed on the front end of the outer wall of the rotating rod 960. A second fixed rod 971 is fixedly installed on the left end of the outer wall of the rotating block 970. A spring 980 is fixedly installed between the second fixed rod 971 and the first fixed rod 941. A contact switch 1010 is fixedly installed on the right end of the inner wall of the power box 903. A fixed bracket 1020 is fixedly installed on the upper end of the inner wall of the power box 903. A motor 1030 is fixedly installed on the fixed bracket 1020. A drive wheel 1040 is fixedly connected to the output end of the motor 1030. A rotating shaft 1050 is rotatably connected to the upper and lower left sides of the inner wall of the force box 903. The lower end of the outer wall of the rotating shaft 1050 passes through the lower end of the outer wall of the air circulation box 902 and is fixedly mounted with a fan blade 1060. A driven wheel 1070 is fixedly mounted on the outer wall of the rotating shaft 1050. The driven wheel 1070 is connected to the driving wheel 1040 via a belt 1080. A straight through hole 1090 is opened at the lower right side of the inner wall of the air circulation box 902, and an air outlet 1100 is opened at the upper end of the outer wall of the air circulation box 902. When the internal pressure of the water storage tank 300 is too high, the sliding block 920 will slide upward under the action of pressure, so that the L-shaped through hole 921 on the sliding block 920 and the straight through hole 1090 are aligned, so that the high-pressure gas inside the water storage tank 300 can pass through the opening 910 and the L-shaped through hole 921. The air is finally discharged from the outlet 1100 through the through hole 1090 and the air circulation box 902. Simultaneously, the sliding block 920 drives the sliding rod 930 to slide upwards, causing the sliding rod 930 to contact the contact switch 1010, thus starting the motor 1030. When the motor 1030 rotates, it drives the drive wheel 1040 to rotate, which in turn drives the belt 1080 and the rotating shaft 1050 to rotate, allowing the fan blades 1060 to rotate, thereby reducing the pressure inside the water storage tank 300. At the same time, as the sliding rod 930 slides upwards, it drives the fixed block 940 to slide upwards. Under the action of the spring 980, the rotating block 970 swings upwards. When the rotating block 970 rotates upwards and jams, the spring 980 exerts an upward pulling force on the fixed rod 941.This ensures that the upper end of the sliding rod 930 remains in contact with the contact switch 1010, thereby increasing the operating time of the motor 1030. This improves the efficiency of internal pressure relief and reduces the pressure relief time, thus reducing heat loss from the water tank 300. When the pressure inside the water tank 300 drops to normal, the sliding block 920 slides downward under pressure, causing the sliding rod 930 to slide downward. At this time, the fixed block 940 pulls the rotating block 970 downward, causing the upper end of the sliding rod 930 to disengage from the contact switch 1010, and the motor 1030 stops working.

[0037] Furthermore, rubber pads 951 are fixedly installed on the upper and lower left sides of the inner wall of the spring booster box 904 to protect the front end of the rotating block 970 from collision.

[0038] Furthermore, the switch pressing point of the contact switch 1010 is aligned with the upper end of the outer wall of the sliding rod 930, enabling the sliding rod 930 to effectively contact the contact switch 1010.

[0039] Furthermore, when the sliding rod 930 slides to contact the contact switch 1010, the L-shaped through hole 921 connects with the straight through hole 1090, so that when the sliding rod 930 is raised to the highest point, the water tank 300 can communicate with the straight through hole 1090 through the L-shaped through hole 921 to release pressure.

[0040] Furthermore, the outer walls of water pipe 600, water pump pipe 860, and hot water outlet pipe 880 are all wrapped with insulation sleeves to reduce heat loss when hot water flows through water pipe 600, water pump pipe 860, and hot water outlet pipe 880.

[0041] In summary, the workflow of this invention is as follows: In practical use, the flue gas in the rotary kiln enters the device through the flue gas inlet pipe 400, and external cold water flows into the secondary recovery chamber 200 through the water inlet pipe 710. The flue gas enters the S-shaped flue pipe 420 through the second flue gas connection pipe 401. The high-temperature flue gas flows inside the S-shaped flue pipe 420, causing the temperature of the heat-conducting aluminum sheet 431, which is in direct contact with the outer wall of the S-shaped flue pipe 420, to rise. This ensures that the hot end of the thermoelectric generator 500 maintains a constant high temperature, forming a hot end. At the same time, the heat-conducting aluminum sheet 530, which is in contact with the inner wall of the water pipe 540, carries away the heat under the action of the flowing water inside the water pipe 540, forming a cold end. This ensures that the hot end of the thermoelectric generator 500... A temperature difference is formed between 510 and the cold end 520 of the thermally differential power generation unit 500, which generates electricity using the temperature difference between the high and low temperatures. Simultaneously, the water inside the first water pipe 540 heats up by absorbing heat from the second heat-conducting aluminum sheet 530. Flue gas flows into the secondary recovery chamber 200 through the flue gas connecting pipe 410. A water inlet pipe 710 is fixedly installed at the upper rear end of the outer wall of the secondary recovery chamber 200. A flue gas exhaust pipe 720 is fixedly installed at the lower end of the water inlet pipe 710 on the rear side of the outer wall of the secondary recovery chamber 200. An air inlet pipe 730 is fixedly installed on the right side of the outer wall of the secondary recovery chamber 200, and a blower 740 is fixedly installed at the right end of the outer wall of the air inlet pipe 730. The device uses the blower 740 to blow outside air into the secondary recovery chamber. The secondary recovery chamber 200 is preheated. A flue gas heating pipe 800 is fixedly installed on the inner wall of the secondary recovery chamber 200. An arc-shaped groove 810 is integrally formed on the upper end of the outer wall of the flue gas heating pipe 800. A heating water pipe 820 is fixedly installed on the inner wall of the arc-shaped groove 810. An arc-shaped groove 830 is integrally formed on the lower end of the outer wall of the flue gas heating pipe 800. An air heating pipe 840 is fixedly installed on the inner wall of the arc-shaped groove 830. The arc-shaped groove 830 increases the contact area between the flue gas heating pipe 800 and the air heating pipe 840, making the heating efficiency of the air in the air heating pipe 840 higher. Simultaneously, the arc-shaped groove 810 increases the contact area between the heating water pipe 820 and the outer wall of the flue gas heating pipe 800, thereby improving its heating efficiency. Cold water is added... After being heated once in hot water pipe 820, the water is reheated in water pipe 540. The heated high-temperature water is pressurized by booster pump 610 and enters water storage tank 300 through storage pipe 850 for storage. Hot water can be drawn from water storage tank 300 through booster pump 870 and water suction pipe 860 and discharged from hot water outlet pipe 880 for people to use. At the same time, when the internal pressure of water storage tank 300 is too high, the sliding block 920 will slide upward under the action of pressure, so that the L-shaped through hole 921 and the straight through hole 1090 on the sliding block 920 are aligned, so that the high-pressure gas inside water storage tank 300 is discharged from the opening 910, L-shaped through hole 921, straight through hole 1090 and air circulation box 902, and finally discharged from the air outlet 1100.Simultaneously, the sliding block 920 drives the sliding rod 930 to slide upward, causing the sliding rod 930 to contact the contact switch 1010, thereby starting the motor 1030. When the motor 1030 rotates, it drives the drive wheel 1040 to rotate, which in turn drives the belt 1080 and the rotating shaft 1050 to rotate, allowing the fan blades 1060 to rotate, thus reducing the pressure inside the water tank 300. At the same time, as the sliding rod 930 slides upward, it also drives the fixed block 940 to slide upward. Under the action of the spring 980, the rotating block 970 will swing upward. When the rotating block 970 rotates upward and jams, the spring 980 will exert an upward pulling force on the fixed rod 941, causing... The upper end of the sliding rod 930 remains in contact with the contact switch 1010, thereby increasing the working time of the motor 1030. This improves the efficiency of internal pressure relief and reduces the pressure relief time, thus reducing heat loss from the water storage tank 300. When the pressure inside the water storage tank 300 drops to normal pressure, the sliding block 920 slides downward under pressure, causing the sliding rod 930 to slide downward. At this time, the fixed block 940 pulls the rotating block 970 downward, causing the upper end of the sliding rod 930 to disengage from the contact switch 1010, and the motor 1030 stops working. This allows the fixed frame 900 to relieve pressure in the water storage tank 300 under high pressure, reducing safety hazards.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotary kiln flue gas low-temperature waste heat recovery device, comprising a primary recovery chamber (100), a secondary recovery chamber (200), and a water storage tank (300), characterized in that: A flue gas inlet pipe (400) is fixedly installed on the left end of the outer wall of the primary recovery chamber (100). A flue gas connecting pipe one (410) is fixedly installed on the upper right side of the outer wall of the primary recovery chamber (100). The rear end of the outer wall of the flue gas connecting pipe one (410) is fixedly connected to the front end of the outer wall of the secondary recovery chamber (200). A flue gas connecting pipe two (401) is fixedly connected to the left end of the inner wall of the primary recovery chamber (100). The left end of the outer wall of the flue gas connecting pipe two (401) is connected to the right end of the outer wall of the flue gas inlet pipe (400). An S-shaped flue pipe (420) is fixedly installed on the right end of the outer wall of the flue gas connecting pipe two (401). A flue gas connecting pipe three (430) is fixedly installed on the right end of the outer wall of the S-shaped flue pipe (420). (430) The upper end of the outer wall is connected to the flue gas connecting pipe (410). The S-shaped flue pipe (420) is symmetrically fixed with heat-conducting aluminum sheets (431) on the front and back sides of the outer wall. Thermoelectric generators (500) are fixedly installed on the opposite sides of the heat-conducting aluminum sheets (431) on both sides. Thermoelectric generators (500) include a hot end (510) and a cold end (520). The hot end (510) of the thermoelectric generator (500) is fixedly connected to the heat-conducting aluminum sheet (431). The opposite ends of the cold ends (520) of the thermoelectric generators (500) on both sides are fixedly installed with heat-conducting aluminum sheets (530). The heat-conducting aluminum sheets (431) and the thermoelectric generators (500) on the front and back sides are fixedly connected. An insulating block (501) is symmetrically fixed in the gap between the front and rear of the heat-conducting aluminum sheet 2 (530). Water pipe 1 (540) is fixedly installed on both the front and rear sides of the heat-conducting aluminum sheet 2 (530) and the insulating blocks (501) on both sides. Water pipe 2 (550) is fixedly installed on the upper end of the outer wall of all water pipe 1 (540). Water pipe 3 (560) is fixedly installed on the lower right side of the outer wall of all water pipe 1 (540). Water pipe 4 (570) is fixedly installed below the right end of the inner wall of the primary recovery chamber (100). The right end of the outer wall of all water pipe 3 (560) is connected to the left end of the outer wall of water pipe 4 (570). Water pipe 5 (600) is fixedly installed on the lower right side of the outer wall of the primary recovery chamber (100). A water pipe (700) is fixedly connected to the left rear end of the outer wall of the primary recovery chamber (100). The rear end of the outer wall of the water pipe (700) is fixedly connected to the front end of the outer wall of the secondary recovery chamber (200). A water inlet pipe (710) is fixedly installed at the upper rear side of the outer wall of the secondary recovery chamber (200). A flue gas exhaust pipe (720) is fixedly installed at the lower end of the water inlet pipe (710) on the rear side of the outer wall of the secondary recovery chamber (200). An air inlet pipe (730) is fixedly installed on the right side of the outer wall of the secondary recovery chamber (200). A blower (740) is fixedly installed at the right end of the outer wall of the air inlet pipe (730). A flue gas heating pipe (800) is fixedly installed on the inner wall of the secondary recovery chamber (200).The upper end of the outer wall of the flue gas heating pipe (800) is integrally formed with an arc-shaped groove 1 (810), and a heating water pipe (820) is fixedly installed on the inner wall of the arc-shaped groove 1 (810). The lower end of the outer wall of the flue gas heating pipe (800) is integrally formed with an arc-shaped groove 2 (830), and an air heating pipe (840) is fixedly installed on the inner wall of the arc-shaped groove 2 (830). The left front end of the outer wall of the heating water pipe (820) is connected to the rear end of the outer wall of the water pipe 6 (700), and the right rear end of the outer wall of the heating water pipe (820) is connected to the front end of the outer wall of the water inlet pipe (710). The right front end of the outer wall of the flue gas heating pipe (800) is connected to the rear end of the outer wall of the flue gas connecting pipe 1 (410). The left front end of the outer wall of the flue gas heating pipe (800) is connected to the front end of the outer wall of the flue gas discharge pipe (720). A booster pump (610) is fixedly installed in the middle of the water pipe five (600). The right end of the outer wall of the water pipe five (600) is fixedly connected to the lower left side of the outer wall of the water storage tank (300). A water storage pipe (850) is fixedly installed on the left end of the inner wall of the water storage tank (300). A water pumping pipe (860) is fixedly installed on the right end of the inner wall of the water storage tank (300). The water pumping pipe (860) passes through the right end of the outer wall of the water storage tank (300) and is fixedly connected to a booster pump two (870). A hot water outlet pipe (880) is fixedly installed on the right end of the outer wall of the booster pump two (870).

2. The rotary kiln flue gas low-temperature waste heat recovery device according to claim 1, characterized in that: The insulating block (501) is made of ceramic material, and the insulating blocks (501) on both sides are the same size and shape.

3. The rotary kiln flue gas low-temperature waste heat recovery device according to claim 1, characterized in that: The contact surfaces of the thermoelectric generator (500) with the thermally conductive aluminum sheet 1 (431) and thermally conductive aluminum sheet 2 (530) on both sides are coated with thermal grease.

4. The rotary kiln flue gas low-temperature waste heat recovery device according to claim 1, characterized in that: A fixed frame (900) is fixedly installed on the upper end of the inner wall of the water storage tank (300). The fixed frame (900) includes a sliding box (901), an air circulation box (902), a power box (903), and a spring-assisted box (904). The sliding box (901) is located on the lower right side of the inner wall of the fixed frame (900). An opening (910) is opened at the lower end of the outer wall of the sliding box (901). A sliding block (920) is slidably connected to the inner wall of the sliding box (901). An L-shaped through hole (921) is integrally formed inside the sliding block (920). A sliding rod is fixedly installed on the upper end of the outer wall of the sliding block (920). 930), the sliding rod (930) passes through the lower end of the inner wall of the spring booster box (904) and the lower end of the inner wall of the power box (903). Limiting blocks (931) are fixedly installed on the right side of the upper and lower ends of the inner wall of the spring booster box (904). A fixing block (940) is fixedly installed on the outer wall of the sliding rod (930) inside the spring booster box (904). A fixing rod (941) is fixedly installed on the front end of the outer wall of the fixing block (940). A support block (950) is fixedly installed in the middle of the upper and lower ends of the inner wall of the spring booster box (904). A rotating rod is rotatably connected to the front end of the outer wall of the support block (950). (960), a rotating block (970) is fixedly installed on the front end of the outer wall of the rotating rod (960), a fixing rod two (971) is fixedly installed on the left end of the outer wall of the rotating block (970), a spring (980) is fixedly installed between the fixing rod two (971) and the fixing rod one (941), a contact switch (1010) is fixedly installed on the right end of the inner wall of the power box (903), a fixing bracket (1020) is fixedly installed on the upper end of the inner wall of the power box (903), a motor (1030) is fixedly installed on the fixing bracket (1020), and a drive wheel is fixedly connected to the output end of the motor (1030). 1040), the upper and lower left sides of the inner wall of the power box (903) are rotatably connected to a rotating shaft (1050), the lower end of the outer wall of the rotating shaft (1050) passes through the lower end of the outer wall of the air circulation box (902) and a fan blade (1060) is fixedly installed, the outer wall of the rotating shaft (1050) is fixedly installed with a driven wheel (1070), the driven wheel (1070) is connected to the driving wheel (1040) by a belt (1080), a through hole (1090) is opened at the lower right side of the inner wall of the air circulation box (902), and an air outlet (1100) is opened at the upper end of the outer wall of the air circulation box (902).

5. A rotary kiln flue gas low-temperature waste heat recovery device according to claim 4, characterized in that: Rubber pads (951) are fixedly installed on the left side of the upper and lower ends of the inner wall of the spring booster box (904).

6. The rotary kiln flue gas low-temperature waste heat recovery device according to claim 4, characterized in that: The switch pressing point of the contact switch (1010) is on the same straight line as the upper end of the outer wall of the sliding rod (930).

7. A rotary kiln flue gas low-temperature waste heat recovery device according to claim 4, characterized in that: When the sliding rod (930) slides to contact the contact switch (1010), the L-shaped through hole (921) communicates with the straight through hole (1090).

8. The rotary kiln flue gas low-temperature waste heat recovery device according to claim 1, characterized in that: The outer walls of the water pipe five (600), the water pumping pipe (860) and the hot water outlet pipe (880) are all wrapped with heat insulation sleeves.

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