A flue gas waste heat recovery device

Abstract

The present invention relates to a flue gas waste heat recovery device, comprising an outer shell, a vertical inner air duct and a circulating water system, an air inlet pipe is provided on one side of the outer shell, an air outlet pipe and a circulating water system are provided on the other side of the outer shell, the air inlet pipe is communicated with the vertical inner air duct, a spiral blade is provided in the vertical inner air duct, and the spiral blade is a spiral rising structure around a circulating water riser, and four receiving hoppers connected up and down are provided inside the outer shell. In industrial production, waste heat from exhaust gas accounts for a high proportion of various heat losses. The high-temperature flue gas discharged from an asphalt mixing station contains a large amount of water vapor and carries a large amount of waste heat. The present invention can recover and reuse the waste heat in the flue gas, which can not only save a lot of energy and save fuel for subsequent stone drying, but also greatly reduce air pollution. At the same time, it can also reduce the production cost of the enterprise, which is also of great practical significance for achieving the strategic requirements of energy conservation and emission reduction.

Description

Technical Field

[0001] The invention belongs to the field of waste heat recovery of high-temperature flue gas in industrial production, and in particular relates to a flue gas waste heat recovery device. Background Art

[0002] In the energy expenditure of industrial production process, the proportion of waste heat of exhaust gas accounts for about 15% to 35%, and the heat loss of flue gas accounts for 5% to 8% of all heat losses. Asphalt mixing is the main technology for mass production of asphalt concrete in pavement engineering. Asphalt mixing station will produce a large amount of flue gas with waste heat during the production process. The waste heat temperature of flue gas discharged by its dust removal system is about 1120℃. The high-temperature flue gas contains a large amount of water vapor and carries a large amount of latent heat, and the amount of flue gas discharged is very large. In the existing production process, a large amount of high-temperature flue gas from the asphalt mixing station is directly discharged into the atmosphere, which not only seriously pollutes the environment, but also causes a large amount of energy waste. Therefore, how to efficiently remove water vapor in the flue gas and recover the waste heat in the flue gas is an urgent problem to be solved in the existing technology. The recovery and reuse of waste heat in flue gas can not only save a lot of energy, save fuel for subsequent stone drying, but also greatly reduce air pollution. At the same time, it can also reduce the production cost of enterprises, which is also of great practical significance for achieving the strategic requirements of energy conservation and emission reduction. Summary of the invention

[0003] A flue gas waste heat recovery device is provided to solve the problem of removing water vapor from high-temperature flue gas in an asphalt mixing plant and recovering flue gas waste heat.

[0004] The technical solution adopted by the present invention is: a flue gas waste heat recovery device, comprising an outer shell, a circulating water system and a vertical inner air duct arranged inside the outer shell, an air inlet pipe is provided on one side of the outer shell, an air outlet pipe and a circulating water system are provided on the other side of the outer shell, the air inlet pipe is communicated with the vertical inner air duct, a spiral blade is provided in the vertical inner air duct, and the spiral blade is a spiral ascending structure, four vertically staggered receiving hoppers are provided inside the outer shell, the vertical inner air duct passes through the center of the receiving hopper, and the receiving hopper and the vertical inner air duct are fixed to the outer shell by a criss-cross support.

[0005] Furthermore, the air inlet pipe passes through the outer shell and is connected with the lower part of the vertical inner air duct. The top of the vertical inner air duct is provided with a material guide cone top, and the bottom of the vertical inner air duct is welded and fixed with an inverted cone-shaped air duct cone bottom.

[0006] Furthermore, the material guide cone top includes an upper cone, and the upper cone is provided with multiple layers of annular angle steels. The material guide cone top is fixedly connected to the top of the vertical inner air duct through supporting legs.

[0007] Furthermore, a water leakage orifice plate is provided at the bottom of the air duct cone bottom, a water collecting box is provided below the water leakage orifice plate, the water collecting box is connected to the condensate return pipe, and the condensate return pipe is connected to the circulating water tank.

[0008] Furthermore, a material elevator is provided outside the outer shell, and the material elevator is connected to the conical feed port at the top of the outer shell through the elevator receiving port.

[0009] Furthermore, a material storage lower cone is provided at the lower part of the outer shell, and the material storage lower cone is located directly below the bottom of the air duct cone of the vertical inner air duct. A discharge valve is provided at the bottom of the material storage lower cone, and a material receiving inclined belt conveyor is provided below the discharge valve. A door opening is provided on the front side of the outer shell, and the material receiving inclined belt conveyor passes through the door opening.

[0010] Furthermore, the cross-section of the four receiving hoppers inside the outer shell is an inverted trapezoidal structure with a larger upper part and a smaller lower part. Each of the receiving hoppers is fixedly connected to the outer shell by two upper and lower criss-cross supports. The criss-cross support on the upper part of each receiving hopper is arranged on the top of the receiving hopper, and the criss-cross support on the lower part of each receiving hopper is arranged at the upper part of the bottom of the receiving hopper and passes through the interior of the receiving hopper body. The lower criss-cross support of each receiving hopper overlaps with the upper criss-cross support of the lower receiving hopper, and the lower criss-cross support of the lowest receiving hopper is connected to the top of the lower cone for storing materials. A certain distance is left between the top of each receiving hopper and the inner wall of the outer shell, and each of the criss-cross supports is fixedly connected to the vertical internal air duct.

[0011] Furthermore, the circulating water system includes a circulating water tank, an air duct water inlet pipe and a circulating water riser. The circulating water tank is connected to the air duct water inlet pipe, and the air duct water inlet pipe is connected to the circulating water riser after passing through a water collecting box and a water leakage orifice plate. The circulating water riser passes through the center of the vertical inner air duct from bottom to top, then passes out from the upper part of the outer shell and is connected to the circulating water tank on the outside of the outer shell. A faucet is provided on the circulating water riser on the outside of the outer shell.

[0012] Furthermore, the air outlet pipe is connected to the outer shell and passes through the outer shell, the air outlet pipe is connected to the air inlet of the induced draft fan through the fan connecting pipe, and the air outlet of the induced draft fan is connected to the chimney.

[0013] Furthermore, the outer wall of the outer shell is provided with a ladder from the bottom to the top, and the outer periphery of the top of the outer shell is provided with a circle of circular guardrails.

[0014] The present invention has the following beneficial effects:

[0015] 1. The present invention works under negative pressure environment, and adopts the combination of vertical inner air duct and outer shell two-layer smoke passage, which can maximize the extension of smoke passage path in the limited internal space of the equipment, and provide an environmental basis for smoke heat exchange. The vertical inner air duct is equipped with spirally rising spiral blades to form a spiral air duct, which can centrifuge water vapor in the smoke and greatly extend the passage path of the smoke. The temperature of the high-temperature smoke continues to decrease during the spiral rise, which provides conditions for the condensation of water vapor in the smoke. At the same time, a circulating water riser in the circulating water system is arranged at the center of the spiral blade, so that the water vapor in the high-temperature smoke passing through the spiral air duct encounters the circulating water riser with cold water inside and is quickly cooled into condensed water, which improves the efficiency of condensation of water vapor in the smoke and realizes the drying of the smoke. The four receiving hoppers arranged in an up-and-down staggered manner inside the outer shell adopt a method in which the bottom of the upper receiving hopper extends into a small part of the top of the next receiving hopper, so that the stones entering from the top of the outer shell can be stacked layer by layer and dried by the flue gas passing through the intersection of each layer of receiving hoppers, realizing multi-stage heat exchange, thereby efficiently recovering waste heat, saving energy, reducing air pollution, saving production costs for the enterprise, and achieving the purpose of energy conservation and emission reduction.

[0016] 2. The air inlet is directly connected to the vertical inner air duct after passing through the outer shell, and the high-speed and high-temperature flue gas is directly sent into the spiral air duct. The extended flue gas channel can produce a centrifugal effect on the flue gas and prolong the time for collecting the residual heat in the flue gas. The residual heat of the flue gas increases the temperature of the outer wall of the vertical inner air duct, which produces a baking effect on the stone in the docking hopper, realizing the first waste heat recovery of the stone. At the same time, the water vapor in the flue gas is cooled in the spiral air duct, and the heat is released during the condensation of the water vapor, releasing the latent heat in the flue gas. The bottom of the vertical inner air duct is provided with a duct cone bottom, which is conducive to the collection of condensed water after the water vapor condenses.

[0017] 3. There is an upper cone on the top of the guide cone at the top of the vertical inner air duct. The upper cone is a conical structure, which allows the stones entering from the feed port to enter the receiving hopper in an umbrella shape 360 ​​degrees along the circumferential direction of the guide cone top. The multi-layer circular angle steel on the upper cone can store stones of a certain thickness. The stones can protect the upper cone from being damaged by the stones and reduce the wear of the upper cone. The guide cone top is connected to the vertical inner air duct through the support legs, so that the high-speed flue gas in the vertical inner air duct can be blown out horizontally from between the support legs to dry the falling stones and realize the second waste heat recovery.

[0018] 4. The condensed water collected in the vertical inner air duct finally gathers at the bottom of the air duct cone, and then passes through the leaky orifice plate into the water collecting box. The leaky orifice plate can reduce the leakage of negative pressure of the equipment. The condensed water flows from the condensed water return pipe into the circulating water tank outside the outer shell, realizing the recovery of water vapor in the flue gas in a simple and efficient way.

[0019] 5. The material elevator outside the outer shell can quickly lift the material from the bottom to the top, and then introduce the stone into the outer shell through the elevator feed port. Loading from the outside will not affect the internal heat exchange and is conducive to maintenance.

[0020] 6. The material storage lower cone at the bottom of the outer shell can collect the dried stones that fall into the upper receiving hopper and discharge them from the discharge valve below. The receiving inclined belt conveyor sends the discharged stones through the door opening on the outer shell to the outside of the outer shell, which is convenient for loading and unloading the dried stones and avoids the danger of people entering the outer shell for loading and unloading.

[0021] 7. The receiving hopper is coaxially arranged with the outer shell. The receiving hopper is an inverted trapezoidal structure with a larger top and a smaller bottom. The top diameter is larger and the bottom diameter is smaller. A certain distance is left between the receiving hopper and the inner wall of the outer shell, so that the flue gas can flow from top to bottom along the channel formed by the inner wall of the outer shell and the outer wall of the receiving hopper, providing a channel for the airflow to dry the stone. The flue gas flow in this space heats the outer shell and the outer wall of the receiving hopper, and dries the internal stone again, realizing the third waste heat recovery. The two well-shaped supports above and below the receiving hopper can firmly fix the receiving hopper on the outer shell, and also fix the vertical inner air duct. The lower tic-tac-toe support of the upper receiving hopper overlaps and is connected to the tic-tac-toe support at the top of the next receiving hopper, and is connected to the inner wall of the outer shell. Similarly, the lower tic-tac-toe support of the lowest receiving hopper is connected to the top of the lower cone of the material storage, thereby forming a part of the bottom of the upper receiving hopper that extends into the top of the lower receiving hopper. Four overlapping receiving hoppers with an inverted trapezoidal cross-section ensure that the stones will not overflow, and the hot air is in direct contact with the ring-shaped stones at this location, realizing the fourth waste heat recovery.

[0022] 8. The circulating water system pumps the cold water in the circulating water tank from the air duct water inlet pipe into the circulating water riser through the circulating water pump. The circulating water riser condenses the water vapor in the high-temperature flue gas in the vertical internal air duct. The heated water extends from the top of the outer shell and returns to the circulating water tank along the side wall of the outer shell. The water in the pipe can be naturally cooled during the process. Using water to cool the water vapor in the flue gas does not require other energy consumption, which is more energy-saving and environmentally friendly. A faucet is installed on the circulating water riser outside the outer shell, so that the hot water in the water pipe can be used elsewhere.

[0023] 9. The air outlet duct is connected with the lower part of the outer shell. The flue gas that has undergone one water vapor recovery and four waste heat recovery is sucked into the exhaust fan from the air outlet duct and discharged through the chimney. The exhaust fan can help to form a negative pressure environment inside the equipment, which is conducive to the high-temperature flue gas to quickly enter the vertical internal air duct, further increasing the flow rate and flow of the high-temperature flue gas and improving the heat exchange efficiency.

[0024] 10. A ladder is provided from bottom to top on the outside of the outer shell, which is convenient for operators to climb to the top of the outer shell to observe and maintain the feeding equipment. A circle of circular guardrails is installed on the top of the outer shell to protect operators at high altitudes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the back structure of the device of the present invention;

[0027] Figure 3 It is a front cross-sectional view of the present invention;

[0028] Figure 4 It is a partial cross-sectional view of the vertical inner air duct and circulating water system of the present invention;

[0029] Figure 5 It is a partial cross-sectional view of the receiving hopper of the present invention;

[0030] Figure 6 For the present invention Figure 4 A schematic diagram of the enlarged structure at point A;

[0031] Figure 7 It is a schematic diagram of the material guide cone top structure of the present invention.

[0032] In the figure: 1. Circulating water system; 2. Oblique belt conveyor for receiving materials; 3. Air inlet pipe; 4. Ladder; 5. Outer shell; 6. Circular guardrail; 7. Material elevator; 8. Air outlet pipe; 9. Fan connecting pipe; 10. Draft fan; 11. Chimney; 12. Vertical inner air duct; 13. Spiral blades; 14. Material receiving hopper; 15. T-shaped support; 16. Discharge valve; 17. Storage lower cone; 18. Circulating water riser; 19. Material guide cone top; 20. Elevator receiving port; 21. Air duct cone bottom; 22. Leakage orifice plate; 23. Water collecting box; 24. Air duct water inlet pipe; 25. Faucet; 26. Circulating water tank; 27. Condensate return pipe; 28. Circular angle steel; 29. ​​Upper cone; 30. Support leg. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1-5As shown, the present invention provides a technical solution: a flue gas waste heat recovery device, comprising an outer shell 5, a vertical inner air duct 12 arranged inside the outer shell 5, and a circulating water system 1. Under a negative pressure working environment, an air inlet pipe 3 is provided on one side of the outer shell 5, which is directly connected to the bottom of the vertical inner air duct 12, and an air outlet pipe 8 and a circulating water system 1 are provided on the other side of the outer shell 5. The air outlet pipe 8 is directly connected to the outer shell 5, so as to facilitate the discharge of the flue gas that has absorbed the waste heat from the outer shell 5. Four upper and lower receiving hoppers 14 are provided inside the outer shell 5, which can ensure that the stone will not overflow, so that the stone can be dried when the flue gas passes through the stone. In this way, the passage path of the high-temperature flue gas is greatly extended in a limited space, so that the flue gas enters from the air inlet pipe 3 and first spirals upward in the vertical inner air duct 12, centrifugally separates the water vapor in the flue gas, and then blows out horizontally from the top of the vertical inner air duct 12, and then moves downward through the receiving hopper 14 layer by layer, and finally discharged from the air outlet pipe 8. At the same time, the circulating water system 1 injects cold water into the circulating water riser 18 in the vertical inner air duct 12 to cool the water vapor in the flue gas, causing it to condense quickly, thereby achieving the drying of the flue gas.

[0035] like Figure 3 As shown, the air inlet pipe 3 passes through the outer shell 5 and is directly connected to the lower part of the vertical inner air duct 12. The vertical inner air duct 12 is provided with a spiral blade 13 that spirals upward. The spiral blade 13 is welded on the vertical inner air duct 12 and is a spiral ascending structure surrounding the circulating water riser 18. The spiral blade 13, the circulating water riser 18 and the vertical inner air duct 12 together form a spiral upward air duct, which can extend the passage path of the high-temperature flue gas after entering the vertical inner air duct 12, extend the heating effect of the waste heat in the high-temperature flue gas on the vertical inner air duct 12 and the condensation effect of the cold water in the circulating water riser 18 on the water vapor in the flue gas, and the heated vertical inner air duct 12 dries the stones in the docking hopper 14. A material guide cone top 19 is provided at the top of the vertical inner air duct 12, so that the stones entering from the feed port can enter the receiving hopper 14 in an umbrella shape 360 ​​degrees along the circumferential direction of the material guide cone top 19. The condensed water obtained by cooling the water vapor in the flue gas will eventually gather at the duct cone bottom 21 set at the bottom of the vertical inner air duct 12. At the same time, the water vapor absorbs heat during the liquefaction process, and the latent heat in the water vapor is released and used to heat the vertical inner air duct 12, thereby realizing the first waste heat recovery.

[0036] like Figure 7As shown, the guide cone top 19 includes an upper cone 29. The conical structure is conducive to the stones being scattered in an umbrella shape along the circumferential direction of the guide cone top 19. The upper cone 29 is provided with multiple layers of annular angle steels 28, which can store stones of a certain thickness at each layer of the upper cone 29. These stones can protect the upper cone 29 from being damaged by the stones and prevent the upper cone 29 from being worn by the stones. The guide cone top 19 is fixedly connected to the top of the vertical inner air duct 12 through the legs 30 to form a horizontal opening to the outside. The smoke from the top of the vertical inner air duct 12 is blown out in a horizontal direction to perform a second drying on the stones scattered from the upper cone 29, thereby realizing a second waste heat recovery.

[0037] like Figure 6 As shown, a leaking orifice plate 22 is provided at the bottom of the duct cone bottom 21. The condensed water in the vertical inner duct 12 flows from the leaking orifice plate 22 into the water collecting box 23 below. The water collecting box 23 is connected with the condensed water return pipe 27. The condensed water finally flows into the circulating water tank 26 through the condensed water return pipe 27, and is used when the circulating water system 1 pumps cold water into the circulating water riser 18, thereby realizing the circulation of water in the circulating water system 1.

[0038] like Figure 1 and 2 As shown, a material hoist 7 is provided outside the outer shell 5, and the material hoist 7 lifts the stone from the bottom to the top of the outer shell 5, and then discharges the stone from the conical feed port at the top of the outer shell 5 into the outer shell 5 through the hoist receiving port 20, thereby realizing the loading process.

[0039] like Figure 1 and 2 As shown, a material storage lower cone 17 is provided at the lower part of the interior of the outer shell 5, and the material storage lower cone 17 is located directly below the duct cone bottom 21 of the vertical inner duct 12. The material storage lower cone 17 is used to collect the dried stones falling from the upper receiving hopper 14. A discharge valve 16 is provided at the bottom of the material storage lower cone 17 to control the discharge of the collected stones. A material receiving inclined belt conveyor 2 is provided below the discharge valve 16. A door opening is provided on the front side of the outer shell 5. The material receiving inclined belt conveyor 2 transmits the stones discharged from the discharge valve 16 through the door opening to the outside of the outer shell 5, so as to facilitate the loading and unloading of the stones.

[0040] like Figure 3 and 5As shown, the cross-section of the four receiving hoppers 14 inside the outer shell 5 is an inverted trapezoidal structure with a larger upper part and a smaller lower part. Each receiving hopper 14 is fixedly connected to the outer shell 5 through two upper and lower '-shaped supports 15. The '-shaped support 15 at the upper part of each receiving hopper 14 is set at the top of the receiving hopper 14, and the '-shaped support 15 at the lower part of each receiving hopper 14 is set at the upper part of the bottom of the receiving hopper 14 and penetrates the inside of the hopper body of the receiving hopper 14. The bottom of each receiving hopper 14 will extend into a small part of the top of the next receiving hopper 14. The lower '-shaped support 15 of each receiving hopper 14 overlaps with the upper '-shaped support 15 of the lower receiving hopper 14, and the lower '-shaped support 15 of the lowest receiving hopper 14 is connected to the top of the storage lower cone 17. A certain distance is left between the top of each receiving hopper 14 and the inner wall of the outer shell 5, and each '-shaped support 15 is fixedly connected to the vertical inner air duct 12. After being blown out from the top of the vertical inner air duct 12, the flue gas moves downward along the outer shell 5 and the receiving hopper 14, and heats the outer shell 5 and the receiving hopper 14 at the same time. The heated shell dries the stones falling from above again, realizing the third waste heat recovery. At the same time, the overlapping structure between the receiving hopper 14 and the lower cone 17 of the storage material ensures that the stones will not overflow, so that the flue gas passing from top to bottom dries the stones again, realizing the fourth waste heat recovery.

[0041] like Figure 1 , 3 As shown in FIG. 4 , the circulating water system 1 includes a circulating water tank 26, an air duct water inlet pipe 24 and a circulating water riser 18. The circulating water tank 26 is connected to the air duct water inlet pipe 24. The cold water in the circulating water tank 26 can be pumped into the circulating water riser 18 from the air duct water inlet pipe 24. The circulating water riser 18 passes through the center of the vertical inner air duct 12 from top to bottom to condense the water vapor in the high-temperature flue gas of the vertical inner air duct 12. The circulating water riser 18 passes through the upper part of the outer shell 5 and returns to the circulating water tank 26 along the side wall of the outer shell 5. A faucet 25 is provided on the circulating water riser 18 outside the outer shell 5, which can control the discharge of hot water in the circulating water riser 18, so as to facilitate the reuse of hot water 3.

[0042] like Figure 1 and 2 As shown, the air outlet pipe 8 is connected with the outer shell 5 and passes through the outer shell 5 to discharge the flue gas after four times of waste heat recovery. The air outlet pipe 8 is connected with the fan connecting pipe 9, and the fan connecting pipe 9 is connected with the air inlet of the induced draft fan 10. The induced draft fan 10 extracts air from the outer shell 5 to make the internal working environment of the equipment negative pressure, which is convenient for the entry of flue gas and the recovery of waste heat. The air outlet of the induced draft fan 10 is connected with the chimney 11 to discharge the treated flue gas.

[0043] like Figure 1 and 2As shown, the outer wall of the outer shell 5 is provided with a ladder 4 from the bottom to the top, which is convenient for operators to climb to the top of the outer shell 5 to observe and maintain the feeding equipment. A circle of circular guardrails 6 is provided on the outer periphery of the top of the outer shell 5 to protect the operators at high altitudes.

[0044] In one embodiment, the present invention works under a negative pressure environment, and the high-temperature flue gas enters from below the vertical inner air duct 12 through the air inlet pipe 3, and quickly passes through the spiral upward air duct surrounded by the spiral blades 13, the circulating water riser 18 and the vertical inner air duct 12, and the water vapor in the flue gas is centrifugally separated. In the process, the high-temperature flue gas heats the vertical inner air duct 12, and can be connected to the hopper 14 to dry the stones, so as to achieve the first waste heat recovery. The circulating water pump in the circulating water system 1 draws cold water from the circulating water tank 26 and pumps it into the air duct inlet pipe 24, thereby entering the circulating water riser 18 in the vertical inner air duct 12, and condensing the water vapor in the flue gas in the vertical inner air duct 12. While the water vapor is cooling, the cold water in the circulating water riser 18 heats up and returns to the circulating water tank 26 along the side wall of the outer shell 5 for natural cooling. The faucet 25 provided on the circulating water riser 18 can reuse the heated water. After the cold water in the circulating water riser 18 cools the water vapor in the flue gas, the condensed water obtained by cooling flows downward to the duct cone bottom 21 at the bottom of the vertical inner duct 12, and then leaks into the water collecting box 23 below from the leaking orifice plate 22 below the duct cone bottom 21, and then flows into the circulating water tank 26 from the condensed water return pipe 27 connected to the water collecting box 23.

[0045] The stone is lifted from the bottom of the equipment to a high place through the material hoist 7, and then introduced into the outer shell 5 through the hoist receiving port 20. The stone falls on the upper cone 29 of the guide cone top 19 through the conical feed port at the top of the outer shell 5, and is accumulated and stored at the multi-layer circular angle steel 28 position of the upper cone 29 to a certain thickness to protect the upper cone 29 from being damaged by the falling stone again. The stone enters the receiving hopper 14 in an umbrella shape along the circumferential direction of the guide cone top 19 at 360 degrees. At this time, the smoke is blown out from the legs 30 of the guide cone top 19 at the top of the vertical inner air duct 12, and the stones that continue to fall are scattered around the upper cone 29 and dried by the blown smoke, realizing the second waste heat recovery.

[0046] The four receiving hoppers 14 with inverted trapezoidal cross-sections inside the outer shell 5 are arranged end to end and up and down, and each receiving hopper 14 is fixedly connected to the outer shell 5 through two well-shaped supports 15 at the top and the upper part of the bottom. The lower well-shaped support 15 of each receiving hopper 14 overlaps with the upper well-shaped support 15 of the lower receiving hopper 14, and the lower well-shaped support 15 of the lowest receiving hopper 14 is connected to the top of the lower cone 17 for storing materials. Each well-shaped support 15 also plays a fixing role on the vertical inner air duct 12. A certain distance is left between the top of each receiving hopper 14 and the inner wall of the outer shell 5, and each well-shaped support 15 is fixedly connected to the vertical inner air duct 12. When the smoke is blown out from the top of the vertical inner air duct 12, it moves downward along the outer shell 5 and the receiving hopper 14, and at the same time heats the outer shell 5 and the receiving hopper 14. The heated shell dries the stones falling from above again, realizing the third waste heat recovery. At the same time, the overlapping structure between the receiving hopper 14 and the lower cone 17 of the material storage ensures that the stones will not overflow, so that the flue gas passing from top to bottom can dry the annular stones again, realizing the fourth waste heat recovery.

[0047] The stone materials that have been dried four times finally fall into the storage cone 17 through four receiving hoppers 14, and are discharged to the receiving inclined belt conveyor 2 below through the discharge valve 16. The receiving inclined belt conveyor 2 passes through the door opening on the outer shell 5 and is sent to the outside of the outer shell 5 for easy loading and unloading. The flue gas temperature drops after the first water vapor condensation and the four waste heat recovery, and is drawn out from the air outlet 8 by the induced draft fan 10 through the fan connecting pipe 9, and then discharged through the chimney 11. The operator can climb to the top of the equipment from the ladder 4 outside the outer shell 5 to observe and inspect the conical feed port. The circular guardrail 6 on the outer periphery of the top of the outer shell 5 can protect the operator at a high place.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flue gas waste heat recovery device, Features It comprises an outer shell (5), a circulating water system (1) and a vertical inner air duct (12) arranged inside the outer shell (5); an air inlet pipe (3) is arranged on one side of the outer shell (5); an air outlet pipe (8) and the circulating water system (1) are arranged on the other side of the outer shell (5); the air inlet pipe (3) is in communication with the vertical inner air duct (12); a spiral blade (13) is arranged inside the vertical inner air duct (12); the spiral blade (13) is a spiral ascending structure; four receiving hoppers (14) are arranged inside the outer shell (5) from top to bottom; the vertical inner air duct (12) passes through the center of the receiving hopper (14); the receiving hopper (14) and the vertical inner air duct (12) are both fixed to the outer shell (5) by a well-shaped support (15); The air inlet pipe (3) passes through the outer shell (5) and is in communication with the lower part of the vertical inner air duct (12); a material guide cone top (19) is provided at the top of the vertical inner air duct (12); and an inverted cone-shaped air duct cone bottom (21) is welded and fixed at the bottom of the vertical inner air duct (12); The material guide cone top (19) comprises an upper cone (29), on which a plurality of layers of annular angle steels (28) are provided, and the material guide cone top (19) is fixedly connected to the top of the vertical inner air duct (12) via supporting legs (30); The cross-section of the four receiving hoppers (14) inside the outer shell (5) is an inverted trapezoidal structure with a larger upper portion and a smaller lower portion. Each of the receiving hoppers (14) is fixedly connected to the outer shell (5) via two upper and lower 'cross'-shaped supports (15). The 'cross'-shaped support (15) at the upper portion of each receiving hopper (14) is arranged at the top of the receiving hopper (14). The 'cross'-shaped support (15) at the lower portion of each receiving hopper (14) is arranged at a position slightly above the bottom of the receiving hopper (14) and penetrates the receiving hopper (14). Inside the hopper body (14), the lower tic-tac-toe support (15) of each receiving hopper (14) is overlapped with the upper tic-tac-toe support (15) of the lower receiving hopper (14), the lower tic-tac-toe support (15) of the lowest receiving hopper (14) is connected to the top of the material storage lower cone (17), a certain distance is left between the top of each receiving hopper (14) and the inner wall of the outer shell (5), and each tic-tac-toe support (15) is fixedly connected to the vertical inner air duct (12); A water leakage orifice plate (22) is provided at the bottom of the air duct cone bottom (21), a water collecting box (23) is provided below the water leakage orifice plate (22), the water collecting box (23) is connected to a condensed water return pipe (27), and the condensed water return pipe (27) is connected to a circulating water tank (26); The circulating water system (1) comprises a circulating water tank (26), an air duct water inlet pipe (24) and a circulating water riser (18); the circulating water tank (26) is in communication with the air duct water inlet pipe (24); the air duct water inlet pipe (24) passes through a water collecting box (23) and a water leakage orifice plate (22) and is then in communication with the circulating water riser (18); the circulating water riser (18) passes through the center of the vertical inner air duct (12) from bottom to top and then passes out from the upper part of the outer shell (5) and is in communication with the circulating water tank (26) on the outer side of the outer shell (5); a faucet (25) is provided on the circulating water riser (18) on the outer side of the outer shell (5).

2. A flue gas waste heat recovery device according to claim 1, Features: A material elevator (7) is provided outside the outer shell (5), and the material elevator (7) is connected to the conical feed port at the top of the outer shell (5) via a elevator receiving port (20).

3. A flue gas waste heat recovery device according to claim 1, Features: A material storage lower cone (17) is provided at the lower part of the interior of the outer shell (5), and the material storage lower cone (17) is located directly below the air duct cone bottom (21) of the vertical inner air duct (12). A discharge valve (16) is provided at the bottom of the material storage lower cone (17), and a material receiving inclined belt conveyor (2) is provided below the discharge valve (16). A door opening is provided at the front of the outer shell (5), and the material receiving inclined belt conveyor (2) passes through the door opening.

4. A flue gas waste heat recovery device according to claim 1, Features: The air outlet pipe (8) is in communication with the outer shell (5) and passes through the outer shell (5); the air outlet pipe (8) is in communication with the air inlet of the induced draft fan (10) through the fan connecting pipe (9); and the air outlet of the induced draft fan (10) is in communication with the chimney (11).

5. A flue gas waste heat recovery device according to claim 1, Features: The outer wall of the outer shell (5) is provided with a ladder (4) extending from the bottom to the top, and the outer periphery of the top of the outer shell (5) is provided with a circle of circular guardrails (6).

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