A waste heat utilization device for a reduction furnace boiler

Abstract

This invention relates to the field of waste heat utilization devices, and discloses a waste heat utilization device for a reduction furnace boiler. The device includes a heat exchange cylinder with a flue gas inlet at its left end and a flue gas outlet at its right end. It also includes: a water tank positioned above the heat exchange cylinder and filled with circulating water; heat exchange tubes disposed within the inner cavity of the heat exchange cylinder; a scraping mechanism disposed within the inner cavity of the heat exchange cylinder; a mixing mechanism disposed within the inner cavity of the water tank; and a feeding mechanism disposed within the inner cavity of the water tank. This invention, through the scraping mechanism, can remove dust from the surface of the heat exchange cylinder, improving the heat exchange efficiency of the heat exchange cylinder for flue gas. Simultaneously, the mixing and feeding mechanisms allow the addition of sodium hydroxide solution to the water tank, removing salts from the water and further enhancing the overall efficiency of the device in absorbing and utilizing waste heat from the flue gas.

Description

Technical Field

[0001] This invention relates to the field of waste heat utilization devices, specifically a waste heat utilization device for a reduction furnace boiler. Background Technology

[0002] A reduction furnace is a heating device primarily used to reduce metallic or ceramic materials from their oxidized state to their elemental or metallic form. This equipment has wide applications in metallurgy, chemistry, and semiconductor manufacturing. The waste heat from boilers mainly comes from the exhaust gases and flue gas generated by fuel combustion. Effective recovery and utilization of this heat can significantly improve energy efficiency. The Pidgeon process for magnesium smelting is a method used in the domestic and international magnesium industry. The core equipment in the Pidgeon process is the reduction furnace, which contains a reduction reaction vessel and a desulfurization reboiler. During emissions, the flue gas is typically passed through the desulfurization reboiler to effectively absorb and utilize the waste heat generated by the reduction furnace boiler.

[0003] However, existing waste heat recovery devices for reduction furnace boilers typically use large amounts of circulating water to cool the flue gas pipes during actual use. As the circulating water is continuously heated, the evaporation rate is high, leading to increased production costs. Furthermore, because pure water contains a large amount of mineral salts, these salts easily condense on the inner walls of the circulating pipes upon heating, which over time reduces heat transfer and negatively impacts waste heat recovery. Therefore, there is an urgent need for a waste heat recovery device for reduction furnace boilers to address these issues. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] The purpose of this invention is to provide a waste heat utilization device for a reduction furnace boiler to solve the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a waste heat utilization device for a reduction furnace boiler, comprising a heat exchange cylinder and supporting feet fixedly installed around the side wall of the heat exchange cylinder, wherein a flue gas inlet is provided at the left end of the heat exchange cylinder and a flue gas outlet is provided at the right end of the heat exchange cylinder, and further comprising:

[0008] A water tank is positioned above the heat exchange cylinder and is filled with circulating water.

[0009] A heat exchange tube is disposed in the inner cavity of a heat exchange cylinder and is used to absorb the heat of the high-temperature flue gas passing through the heat exchange cylinder.

[0010] A scraping mechanism is provided in the inner cavity of the heat exchange tube, and the scraping mechanism is used to adsorb dust adhering to the side wall of the heat exchange tube.

[0011] A mixing mechanism is disposed inside the water tank and is used to stir the circulating water in the water tank;

[0012] A feeding mechanism is installed inside the water tank and is used to add sodium hydroxide solution into the water tank.

[0013] Preferably, the scraping mechanism includes a tripod fixedly installed on the inner wall of the flue gas outlet, and a transmission rod rotatably installed in the inner cavity of the tripod. A guide impeller is fixedly installed on the right end of the transmission rod, and a rotating disk is fixedly installed on the left end of the transmission rod. An arc-shaped frame is rotatably installed on the outer side of the left end face of the rotating disk. The lower part of the side wall of the heat exchange tube is provided with a threaded surface, and a scraping plate is threadedly installed on the lower side wall of the heat exchange tube.

[0014] Preferably, the guide impeller is located at the outlet of the flue gas outlet, the arc-shaped frame is provided with a movable groove, a connecting rod is slidably installed in the inner cavity of the movable groove, the connecting rod is fixedly connected to the scraper plate, and the thread helix angle of the heat exchange tube is greater than the equivalent friction angle of the scraper plate.

[0015] Preferably, the mixing mechanism includes a worm gear fixedly installed on the upper side wall of at least one heat exchange tube, and a guide rod rotatably installed in the middle of the inner cavity of the water tank. A worm wheel is fixedly installed in the middle of the side wall of the guide rod, and mixing blades are fixedly installed on the left and right sides of the side wall of the guide rod.

[0016] Preferably, the worm gear is meshed with the worm wheel, the mixing blades on the left and right sides are arranged in a mirror symmetrical manner, the upper end of the heat exchange tube is open, a water collection seat connected to the heat exchange tube is fixedly installed on the lower end face of the heat exchange cylinder, the water collection seat is fixed to the water tank through a circulation pipe, and a circulation pump is fixedly installed on the side wall of the circulation pipe.

[0017] Preferably, the feeding mechanism includes a cam rotatably mounted on the side wall of the guide rod and a pressure accumulator fixedly mounted on the top surface of the inner cavity of the heat exchange cylinder. A piston plate is slidably mounted in the inner cavity of the pressure accumulator, and a push rod is fixedly mounted on the lower end face of the piston plate. A return spring is sleeved on the side wall of the push rod, and the two ends of the return spring are fixedly connected to the side wall of the piston plate and the inner wall of the pressure accumulator, respectively. A water storage box is fixedly mounted on the upper end face of the heat exchange cylinder.

[0018] Preferably, the push rod is in contact with the side wall of the cam, the side wall of the push rod is provided with a drain port, the inner cavity of the drain port is provided with a one-way water valve with the outlet to the outside, the water storage box is connected to the accumulator box through the inlet pipe, and the inner cavity of the inlet pipe is provided with a one-way water valve with the outlet to the inner cavity of the accumulator box.

[0019] Preferably, a water supply pipe is fixedly installed in the middle of the upper end face of the water tank, a pressure relief valve is fixedly installed on the side of the upper end face of the water tank near the water supply pipe, and a drain pipe is fixedly installed at the lower part of the rear end face of the water tank.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. This invention utilizes the continuous flow of waste gas as it passes through the flue gas outlet to drive the guide impeller to rotate. The guide impeller then drives the transmission rod to rotate the rotating disk. Under the limiting effect of the movable groove on the arc frame on the connecting rod, the connecting rod will drive the scraper to move up and down reciprocally with the rotation of the rotating disk. At this time, the scraper can remove the dust on the lower surface of the heat exchange tube, thereby improving the efficiency of heat exchange tube for flue gas heat exchange.

[0022] 2. This invention, through the arrangement of a mixing mechanism and a feeding mechanism, enables the water on the left and right sides of the water tank 2 to impact each other, thereby mixing the water and balancing the temperature of the entire water body, thus improving the efficiency of heat exchange between the clean water and the flue gas. At the same time, sodium hydroxide solution can be added to the water tank, and with the cooperation of the mixing mechanism 5, the sodium hydroxide solution can fully react with the salts in the water tank 2, thereby achieving desalination of the water body, improving the heat efficiency ratio of the water body, and thus effectively improving the quality of waste heat utilization of the reduction furnace boiler by the entire device. Attached Figure Description

[0023] Figure 1 This is a frontal view of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall rear view structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the rear cross-sectional structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the rear partial cross-sectional structure of the present invention;

[0027] Figure 5 This is a schematic diagram of a partial sectional view of the present invention from the side;

[0028] Figure 6 This is a cross-sectional view of the accumulator box of the present invention.

[0029] In the diagram: 1. Heat exchanger cylinder; 11. Flue gas inlet; 12. Flue gas outlet; 2. Water tank; 21. Water supply pipe; 22. Pressure relief valve; 23. Sewage pipe; 3. Heat exchanger tube; 4. Scraping mechanism; 41. Tripod; 42. Transmission rod; 43. Guide impeller; 44. Rotating disc; 45. Arc frame; 451. Movable groove; 452. Connecting rod; 46. Scraper plate; 5. Mixing mechanism; 51. Worm gear; 52. Guide rod; 53. Worm wheel; 54. Mixing blade; 6. Feeding mechanism; 61. Cam; 62. Accumulator box; 63. Piston plate; 64. Push rod; 641. Drain port; 65. Return spring; 66. Water storage box; 661. Inlet pipe; 7. Water collection base; 71. Circulation pipe; 72. Circulation pump. Detailed Implementation

[0030] 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.

[0031] Please see Figures 1-6 This invention provides a technical solution for a waste heat utilization device for a reduction furnace boiler: a waste heat utilization device for a reduction furnace boiler includes a heat exchange cylinder 1 and support feet fixedly installed around the side wall of the heat exchange cylinder 1. A flue gas inlet 11 is provided at the left end of the heat exchange cylinder 1, and a flue gas outlet 12 is provided at the right end of the heat exchange cylinder 1. It also includes:

[0032] Water tank 2 is located above heat exchange cylinder 1 and is filled with circulating water.

[0033] Heat exchange tube 3 is installed in the inner cavity of heat exchange cylinder 1 and is used to absorb the heat of high-temperature flue gas passing through heat exchange cylinder 1.

[0034] Scraping mechanism 4 is installed in the inner cavity of heat exchange cylinder 1. Scraping mechanism 4 is used to adsorb dust adhering to the side wall of heat exchange tube 3.

[0035] The mixing mechanism 5 is installed inside the water tank 2 and is used to stir the circulating water in the water tank 2.

[0036] Feeding mechanism 6 is installed inside the water tank 2 and is used to add sodium hydroxide solution into the water tank 2.

[0037] Furthermore, the scraping mechanism 4 includes a tripod 41 fixedly installed on the inner wall of the flue gas outlet 12, and a transmission rod 42 rotatably installed in the inner cavity of the tripod 41. A guide impeller 43 is fixedly installed on the right end of the transmission rod 42, and a rotating disk 44 is fixedly installed on the left end of the transmission rod 42. An arc frame 45 is rotatably installed on the outer side of the left end face of the rotating disk 44. The lower part of the side wall of the heat exchange tube 3 is set as a threaded surface, and a scraping plate 46 is threadedly installed on the lower side wall of the heat exchange tube 3.

[0038] The guide impeller 43 is set at the outlet of the flue gas outlet 12. The arc frame 45 is provided with a movable groove 451. A connecting rod 452 is slidably installed in the inner cavity of the movable groove 451. The connecting rod 452 is fixedly connected to the scraper 46. The thread helix angle of the heat exchange tube 3 is greater than the equivalent friction angle of the scraper 46.

[0039] The mixing mechanism 5 includes a worm gear 51 fixedly installed on the upper side wall of at least one heat exchange tube 3, and a guide rod 52 rotatably installed in the middle of the inner cavity of the water tank 2. A worm wheel 53 is fixedly installed in the middle of the side wall of the guide rod 52, and mixing blades 54 are fixedly installed on the left and right sides of the side wall of the guide rod 52.

[0040] The worm gear 51 is meshed with the worm wheel 53. The mixing blades 54 on the left and right sides are arranged in a mirror symmetrical manner. The upper end of the heat exchange tube 3 is open. A water collection seat 7 connected to the heat exchange tube 3 is fixedly installed on the lower end face of the heat exchange cylinder 1. The water collection seat 7 is fixed to the water tank 2 through the circulation pipe 71. A circulation pump 72 is fixedly installed on the side wall of the circulation pipe 71.

[0041] It should be noted that the user introduces the high-temperature exhaust gas from the reduction furnace boiler into the heat exchange cylinder 1 through the flue gas inlet 11 and then discharges it from the flue gas outlet 12. At the same time, the circulating pump 72 is started to draw in clean water from the water tank 2, so that the clean water enters the water collection seat 7 through the circulating pipe 71 and is then sprayed out from the top of the heat exchange tube 3. At this time, the entire device can realize a closed loop of clean water circulation. When the clean water is at the lower position of the heat exchange tube 3, it can come into contact with the high-temperature hot gas that is constantly entering the heat exchange cylinder 1 and quickly remove the heat from the exhaust gas. Thus, the entire device can realize the function of utilizing the waste heat of the reduction furnace boiler.

[0042] Furthermore, the feeding mechanism 6 includes a cam 61 rotatably mounted on the side wall of the guide rod 52, and a pressure accumulator 62 fixedly mounted on the top surface of the inner cavity of the heat exchange cylinder 1. A piston plate 63 is slidably mounted in the inner cavity of the pressure accumulator 62. A push rod 64 is fixedly mounted on the lower end face of the piston plate 63. A return spring 65 is sleeved on the side wall of the push rod 64. The two ends of the return spring 65 are fixedly connected to the side wall of the piston plate 63 and the inner wall of the pressure accumulator 62, respectively. A water storage box 66 is fixedly mounted on the upper end face of the heat exchange cylinder 1.

[0043] The push rod 64 is in contact with the side wall of the cam 61. The side wall of the push rod 64 is provided with a drain port 641. The inner cavity of the drain port 641 is provided with a one-way water valve that leads to the outside. The water storage box 66 is connected to the accumulator box 62 through the inlet pipe 661. The inner cavity of the inlet pipe 661 is provided with a one-way water valve that leads to the inner cavity of the accumulator box 62.

[0044] A water supply pipe 21 is fixedly installed in the middle of the upper end face of water tank 2. A pressure relief valve 22 is fixedly installed on the side of the upper end face of water tank 2 near the water supply pipe 21. A drain pipe 23 is fixedly installed in the lower part of the rear end face of water tank 2.

[0045] It should be noted that when the guide rod 52 rotates, the cam 61 fixed on its side wall also rotates and continuously squeezes the push rod 64, causing the piston plate 63 to move up and down in the inner cavity of the accumulator box 62. At this time, the accumulator box 62 can draw sodium hydroxide solution from the water storage box 66 through the liquid inlet pipe 661 and discharge the sodium hydroxide solution in the accumulator box 62 into the water tank 2 through the push rod 64. At this time, with the cooperation of the mixing mechanism 5, the sodium hydroxide solution can fully contact and react with the salts in the water tank 2, so as to realize the desalination operation of the water body, improve the heat efficiency ratio of the water body, and thus effectively improve the quality of the entire device in utilizing the waste heat of the reduction furnace boiler.

[0046] Before starting work, the user adds an appropriate amount of clean water to the water tank 2 through the water supply pipe 21, ensuring that the water level is always above the inlet of the circulation pipe 71, and adds an appropriate amount of sodium hydroxide solution to the water storage box 66.

[0047] During operation, the user introduces the high-temperature exhaust gas from the reduction furnace boiler into the heat exchange cylinder 1 through the flue gas inlet 11 and then discharges it from the flue gas outlet 12. At the same time, the circulating pump 72 is started to draw in clean water from the water tank 2, and the clean water enters the water collection seat 7 through the circulating pipe 71 and is then sprayed out from the top of the heat exchange tube 3. At this time, the entire device can realize a closed loop of clean water circulation. When the clean water is at the lower part of the heat exchange tube 3, it can come into contact with the high-temperature hot gas that is constantly passing through the heat exchange cylinder 1 and quickly remove the heat from the exhaust gas. Thus, the entire device can realize the function of utilizing the waste heat of the reduction furnace boiler.

[0048] When the exhaust gas enters and exits through the flue gas outlet 12, the continuously flowing exhaust gas can drive the guide impeller 43 to rotate. The guide impeller 43 can then drive the transmission rod 42 to rotate the rotating disk 44. Under the limiting action of the movable groove 451 on the arc frame 45 on the connecting rod 452, the connecting rod 452 will drive the scraper 46 to move up and down reciprocally with the rotation of the rotating disk 44. At this time, the scraper 46 can remove the dust on the lower surface of the heat exchange tube 3 to improve the efficiency of heat exchange tube 3 for flue gas heat exchange.

[0049] When the scraper plate 46 moves up and down, the heat exchange tube 3 is threadedly connected to the scraper plate 46, and the thread helix angle of the heat exchange tube 3 is greater than the equivalent friction angle of the scraper plate 46. At this time, the heat exchange tube 3 will rotate, which will drive the worm 51 to rotate the worm wheel 53. The worm wheel 53 will drive the guide rod 52 and the mixing blades 54 on the left and right sides to rotate. The mixing blades 54 on the left and right sides are mirror symmetrically arranged, which causes the water on the left and right sides of the water tank 2 to impact each other, so as to achieve the effect of mixing the water and make the temperature of the entire water body uniform, thereby improving the efficiency of heat exchange between the clean water and the flue gas.

[0050] When the guide rod 52 rotates, the cam 61 fixed on its side wall also rotates and continuously squeezes the push rod 64, causing the piston plate 63 to move up and down in the inner cavity of the accumulator box 62. At this time, the accumulator box 62 can draw sodium hydroxide solution from the water storage box 66 through the liquid inlet pipe 661 and discharge the sodium hydroxide solution in the accumulator box 62 into the water tank 2 through the push rod 64. At this time, with the cooperation of the mixing mechanism 5, the sodium hydroxide solution can fully contact and react with the salts in the water tank 2, so as to realize the desalination operation of the water body, improve the heat efficiency ratio of the water body, and thus effectively improve the quality of the entire device in utilizing the waste heat of the reduction furnace boiler.

[0051] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A waste heat utilization device for a reduction furnace boiler, comprising a heat exchange cylinder (1) and supporting feet fixedly installed around the side wall of the heat exchange cylinder (1), wherein a flue gas inlet (11) is provided at the left end of the heat exchange cylinder (1) and a flue gas outlet (12) is provided at the right end of the heat exchange cylinder (1), characterized in that: Also includes: Water tank (2), the water tank (2) is located above the heat exchange cylinder (1), and the water tank (2) is filled with circulating water; Heat exchange tube (3) is installed in the inner cavity of heat exchange cylinder (1) and is used to absorb the heat of high-temperature flue gas passing through heat exchange cylinder (1). Scraping mechanism (4) is provided in the inner cavity of heat exchange cylinder (1) and is used to adsorb dust adhering to the side wall of heat exchange tube (3). The scraping mechanism (4) includes a tripod (41) fixedly installed on the inner wall of the flue gas outlet (12) and a transmission rod (42) rotatably installed in the inner cavity of the tripod (41). A guide impeller (43) is fixedly installed on the right end of the transmission rod (42), and a rotating disk (44) is fixedly installed on the left end of the transmission rod (42). An arc frame (45) is rotatably installed on the outer side of the left end face of the rotating disk (44). The lower part of the side wall of the heat exchange tube (3) is set as a threaded surface, and a scraping plate (46) is threaded on the lower side wall of the heat exchange tube (3). The guide impeller (43) is located at the outlet of the flue gas outlet (12). The arc frame (45) is provided with a movable groove (451). A connecting rod (452) is slidably installed in the inner cavity of the movable groove (451). The connecting rod (452) is fixedly connected to the scraper (46). The thread helix angle of the heat exchange tube (3) is greater than the equivalent friction angle of the scraper (46). A mixing mechanism (5) is provided in the inner cavity of the water tank (2). The mixing mechanism (5) is used to stir the circulating water in the water tank (2). A guide rod (52) is rotatably installed in the middle of the inner cavity of the water tank (2). Feeding mechanism (6), the feeding mechanism (6) is set in the inner cavity of water tank (2), the feeding mechanism (6) is used to add sodium hydroxide solution into water tank (2); The feeding mechanism (6) includes a cam (61) rotatably mounted on the side wall of the guide rod (52) and a pressure accumulator (62) fixedly mounted on the top surface of the inner cavity of the heat exchange cylinder (1). A piston plate (63) is slidably mounted in the inner cavity of the pressure accumulator (62). A push rod (64) is fixedly mounted on the lower end face of the piston plate (63). A return spring (65) is sleeved on the side wall of the push rod (64). The two ends of the return spring (65) are fixedly connected to the side wall of the piston plate (63) and the inner wall of the pressure accumulator (62) respectively. A water storage box (66) is fixedly mounted on the upper end face of the heat exchange cylinder (1). The push rod (64) is in contact with the side wall of the cam (61). A drain port (641) is provided on the side wall of the push rod (64). A one-way water valve with an outlet to the outside is provided in the inner cavity of the drain port (641). The water storage box (66) is connected to the accumulator box (62) through the inlet pipe (661). A one-way water valve with an outlet to the inner cavity of the accumulator box (62) is provided in the inner cavity of the inlet pipe (661).

2. The waste heat utilization device for a reduction furnace boiler according to claim 1, characterized in that: The mixing mechanism (5) includes a worm gear (51) fixedly installed on the upper side wall of at least one heat exchange tube (3), a worm wheel (53) fixedly installed in the middle of the side wall of the guide rod (52), and mixing blades (54) fixedly installed on the left and right sides of the side wall of the guide rod (52).

3. A waste heat utilization device for a reduction furnace boiler according to claim 2, characterized in that: The worm (51) is meshed with the worm wheel (53), the mixing blades (54) on the left and right sides are arranged in a mirror symmetry, the upper end of the heat exchange tube (3) is open, the lower end face of the heat exchange cylinder (1) is fixedly installed with a water collection seat (7) connected to the heat exchange tube (3), the water collection seat (7) is fixed to the water tank (2) through the circulation pipe (71), and a circulation pump (72) is fixedly installed on the side wall of the circulation pipe (71).

4. The waste heat utilization device for a reduction furnace boiler according to claim 1, characterized in that: A water supply pipe (21) is fixedly installed in the middle of the upper end face of the water tank (2), a pressure relief valve (22) is fixedly installed on the side of the upper end face of the water tank (2) near the water supply pipe (21), and a sewage pipe (23) is fixedly installed at the lower part of the rear end face of the water tank (2).

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