Waste heat recovery device and recovery process of coke oven ascension pipe

Abstract

The invention relates to the technical field of coke oven ascension pipe waste heat recovery, and provides a coke oven ascension pipe waste heat recovery device and technology.The coke oven ascension pipe waste heat recovery device comprises a concentric-square-shaped pipe, a heat exchange barrel, a heat exchange mechanism and an ash removing and discharging mechanism, and the bottom of the heat exchange barrel is conical; the heat exchange mechanism is arranged on the side, away from the flue gas pipeline, of the heat exchange barrel, the heat exchange mechanism is used for absorbing heat in flue gas, the heat exchange mechanism comprises a heat exchange shell and a steam discharge pipe, the heat exchange shell is arranged to be in a barrel shape, the steam discharge pipe is used for being communicated with external equipment utilizing steam, and the ash removal discharge mechanism is arranged on the heat exchange barrel. By means of the technical scheme, the problem that in the prior art, when waste heat recovery is conducted on a coke oven ascending pipe through a water jacket traditionally, it is difficult to guarantee the temperature of recovered water while reducing the pipeline pressure is solved.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery of coke oven riser pipes, and in particular to a waste heat recovery device and a recovery process of a coke oven riser pipe. Background Art

[0002] The coke oven riser is a device installed on the top of the coke oven and connected to the coke oven carbonization chamber. Its main function is to transport the raw gas produced in the carbonization chamber to the coke oven gas collecting main. The gas introduced into the coke oven riser is mainly raw gas produced in the coking process. The raw gas is discharged from the carbonization chamber at a temperature of about 700-800℃ and enters the gas collecting pipe along the riser. In the riser, the waste heat of the raw gas can be recycled. Raw gas refers to the unpurified yellow raw gas produced by coking coal in the carbonization chamber. There is more dust in the raw gas. The traditional way to recycle the raw gas is to spray ammonia water and cool the raw gas by evaporation of ammonia water. However, this process will waste a lot of heat in the raw gas and consume a lot of water resources and electricity.

[0003] Traditionally, waste heat recovery of high-temperature raw coal gas in the coke oven riser is mostly carried out by setting a water jacket on the coke oven riser. The raw coal gas heats the water in the water jacket. However, as the water jacket is heated, a mixture of steam and water will be formed, causing the water jacket to be subjected to a relatively high pressure. If the flow rate of the water in the water jacket is too slow, the pressure in the water jacket will be too high, which may cause damage to the water jacket. If the flow rate of the water in the water jacket is too fast, the obtained water temperature will be relatively low. Summary of the invention

[0004] The present invention provides a waste heat recovery device and recovery process for a coke oven riser, which solves the problem in the related art that it is difficult to reduce the pipeline pressure and ensure the recovered water temperature at the same time when recovering waste heat from the coke oven riser through a water jacket.

[0005] The technical solution of the present invention is as follows: A waste heat recovery device for a coke oven riser, comprising a flue gas duct, the flue gas duct being connected to the coke oven riser, and further comprising a return pipe, a heat exchange barrel, a heat exchange mechanism and a dust removal and discharge mechanism, the return pipe being connected to the flue gas duct, the lower side of the heat exchange barrel being connected to the return pipe, a smoke exhaust port being arranged on the top of the heat exchange barrel, the bottom of the heat exchange barrel being arranged in a conical shape, the heat exchange mechanism being arranged on a side of the heat exchange barrel away from the flue gas duct, the heat exchange mechanism being in contact with the flue gas, and the heat exchange mechanism being used to absorb heat in the flue gas, wherein the heat exchange mechanism comprises A heat exchange shell and a steam exhaust pipe, wherein the heat exchange shell is fixedly connected to the heat exchange barrel, the heat exchange shell is configured to be barrel-shaped, the steam exhaust block is fixedly arranged on the heat exchange shell, the steam exhaust pipe passes through the heat exchange shell and the heat exchange barrel, the steam exhaust pipe is used to communicate with external equipment utilizing steam, the dust cleaning exhaust mechanism is arranged on the heat exchange barrel, the dust cleaning exhaust mechanism extends into the heat exchange barrel, the dust cleaning exhaust mechanism is slidably connected to the heat exchange shell, and the dust cleaning exhaust mechanism is used to remove dust on the heat exchange shell and discharge the dust from the heat exchange barrel.

[0006] The heat exchange mechanism also includes a steam valve, a heat absorption component and a fin ring. The steam valve is arranged in the heat exchange shell, and the steam valve is connected to the steam exhaust pipe. The heat absorption component is arranged in the heat exchange shell, and the steam valve is connected to the heat absorption component. The heat absorption component is used to fully absorb the heat on the heat exchange shell. A plurality of fin rings are arranged, and the sides and the bottom of the heat exchange shell are respectively fixedly connected with a plurality of fin rings. The dust removal and exhaust mechanism is in contact with the fin rings.

[0007] The heat absorption component includes a heating groove 1, a heating groove 2, a water inlet pipe 1, a water inlet pipe 2 and a heating threaded sheet. The heating groove 1 is opened at the bottom of the heat exchange shell, and the heating groove 1 is set to be semicircular. The heating groove 2 is opened at the bottom of the heat exchange shell, and the heating groove 2 is set to be semicircular. The heating groove 1 and the heating groove 2 are combined into a cone. The water inlet pipe 1 is fixedly connected to the heat exchange shell, and the water inlet pipe 1 is threadedly arranged in the heat exchange shell. One end of the water inlet pipe 1 is connected to the side of the heating groove 1, and the other end passes through the heat exchange shell and then passes through the heat exchange barrel. The water inlet pipe 2 is fixedly connected to the heat exchange shell, and the water inlet pipe 2 is threadedly arranged in the heat exchange shell. One end of the water inlet pipe 2 is connected to the side of the heating groove 2, and the other end passes through the heat exchange shell and then passes through the heat exchange barrel. The heating threaded sheet is fixedly connected to the inside of the heat exchange shell, and the heating threaded sheet is threadedly arranged.

[0008] A one-way valve 1 is installed on the end of the water inlet pipe 1 extending out of the heat exchange barrel, and a one-way valve 2 is installed on the end of the water inlet pipe 2 extending out of the heat exchange barrel. The top of the heating tank 1 is connected to an exhaust pipe 1, and the top of the heating tank 2 is connected to an exhaust pipe 2. Both the exhaust pipe 1 and the exhaust pipe 2 are connected to the steam valve.

[0009] The steam valve is provided with a steering tube, a guide tube, a plug, a baffle and a mixing tube. There are two steering tubes, which are arranged opposite to each other. The two steering tubes are respectively connected to the exhaust pipe one and the exhaust pipe two. Each steering tube is fixedly connected with a guide tube, the two guide tubes are arranged opposite to each other, and each guide tube is slidably connected with a plug. The plug is detachably connected to the steering tube. The baffle is fixedly connected between the two guide tubes. The two plugs are respectively arranged on both sides of the baffle. A spring one is fixedly connected between the plug and the baffle. Both plugs can pass through the baffle. The mixing tube is connected to the two guide tubes, the steam exhaust pipe is connected to the mixing tube, and the baffle is arranged in the mixing tube.

[0010] The ash cleaning and discharging mechanism includes a cleaning ring, an ash discharging pipe, a transmission shaft and an ash discharging anti-leakage component. The cleaning ring is sleeved on the heat exchange shell, the cleaning ring is fitted with a plurality of fin rings, the ash discharging pipe is connected to the bottom center of the heat exchange barrel, the transmission shaft is fixedly connected to the cleaning ring, the transmission shaft passes through the ash discharging pipe, the ash discharging anti-leakage component is arranged on the transmission shaft and the ash discharging pipe, and the ash discharging anti-leakage component is used to prevent smoke and dust from being discharged simultaneously when discharging dust from the heat exchange barrel.

[0011] The ash discharge anti-leakage assembly includes a threaded blade, a convex tooth and a sealing sheet, wherein the threaded blade is fixedly connected to the transmission shaft, the threaded blade is arranged in the ash discharge pipe, the convex tooth is fixedly connected below the threaded blade, the sealing sheet is sleeved on the transmission shaft, the sealing sheet is arranged on the lower side of the ash discharge pipe and is detachably connected to the ash discharge pipe, the convex tooth is fixedly connected to one side of the sealing sheet close to the threaded blade, and the convex tooth on the threaded blade can contact the convex tooth on the sealing sheet.

[0012] A base is provided below the ash discharge pipe, the transmission shaft passes through the base, a second spring is fixedly connected between the base and the sealing sheet, a motor is fixedly connected below the base, and an output end of the motor is fixedly connected to the transmission shaft.

[0013] A waste heat recovery process for a coke oven riser, using the above-mentioned waste heat recovery device for a coke oven riser, comprises the following steps: Step 1: Smoke diversion: Smoke enters the return pipe through the smoke pipe, and then enters the heat exchange barrel and contacts the heat exchange shell; Step 2, flue gas heat exchange: the flue gas contacts the fin ring and conducts the heat to the heat exchange shell, and the water in the water inlet pipe 1, water inlet pipe 2, heating tank 1 and heating tank 2 is heated; Step 3, heating and evaporation: After the water in the heating tank 1 and the heating tank 2 is heated and evaporated into water vapor, the pressure in the heating tank 1 and the heating tank 2 increases, and the steam is discharged to the steam valve through the exhaust pipe 1 and the exhaust pipe 2; Step 4: Steam discharge: When the steam pressure is high, it will push the plug, and the plug will squeeze the spring 1, so that the plug and the steering tube are separated, and the steam flows between the plug and the guide tube into the mixing tube. When the steam pressure is low, the thrust on the plug is reduced, the plug contacts the steering tube, and the steam stops being discharged; Step 5, alternate discharge: when the steam pressure in the steering pipe on one side is relatively large, the plug on one side squeezes the spring 1, and the plug contacts the plug on the other side, so that the plug on the other side cannot be separated from the steering pipe. As the steam is discharged, the pressure in the steering pipe on one side decreases. When the steam pressure in the steering pipe on one side is less than the steam pressure in the steering pipe on the other side, the plug on the other side pushes the plug on one side to move, so that steam is discharged from the guide pipe on the other side, and the steam discharge in the guide pipe on one side stops, and the two plugs move alternately; Step 6, alternating hot and cold water: when the steam pressure in heating tank 1 is high, as the steam is discharged through the guide pipe, the amount of water in heating tank 1 decreases. When the amount of water cannot maintain enough steam, the pressure in heating tank 1 decreases. At this time, water is sucked into heating tank 1 through one-way valve 1 for heating. After the water temperature rises, the steam is discharged through exhaust pipe 1. Heating tank 1 and heating tank 2 alternately absorb water, heat, and discharge steam. Step 7: Clean the dust: The output end of the motor drives the transmission shaft to rotate, and the cleaning ring sweeps the dust on the fin ring to the dust discharge pipe; Step 8. Dust discharge: When the threaded blades rotate, they push the dust downward. When the convex teeth on the threaded blades rotate, they come into contact with the convex teeth on the sealing sheet, pushing the sealing sheet to squeeze the spring 2. The sealing sheet is separated from the ash discharge pipe. At this time, the dust is discharged. When the convex teeth on the threaded blades separate from the convex teeth on the sealing sheet, the sealing sheet fits with the ash discharge pipe under the push of the spring 2.

[0014] The working principle and beneficial effects of the present invention are: 1. In the present invention, by setting the heating tank 1 and the heating tank 2, when the water temperature rises and is converted into steam, the steam at the bottom of the heating tank 1 and the heating tank 2 will be squeezed into the steam valve. As the water decreases, the contact surface between the water and the heat exchange shell decreases, and the amount of steam cannot be maintained. The steam condenses into water, and the air pressure decreases to absorb the water in the water inlet pipe 1 and the water inlet pipe 2. At the same time, because the temperature of the incoming water is lower than that of the steam, the steam condenses and continues to absorb water. When the water is heated and converted into steam again, the hot water at the bottom of the heating tank 1 and the heating tank 2 is pushed into the steam valve again, and the steam is discharged alternately, so that the discharged steam is all high-temperature steam; 2. In the present invention, by setting a steam valve, the mutual push of the two plugs causes the steam in the two guide pipes to spray out alternately, thereby avoiding the intermittent steam output. At the same time, the plug also squeezes the steering pipe to increase the pressure required for steam discharge, and further increases the output steam pressure and temperature; 3. In the present invention, by setting a heat exchange mechanism and adjusting the steam valve, steam with a relatively high temperature can be continuously output, thereby ensuring the output temperature. By setting a dust removal and discharge mechanism, dust in the flue gas can be cleaned and automatically discharged, thereby preventing the flue gas from being discharged in large quantities along with the dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure inside the heat exchange barrel of the present invention; Figure 3 It is a schematic diagram of the internal cross-sectional structure of the heat exchange barrel in the present invention from another perspective; Figure 4 It is a schematic diagram of the internal cross-sectional structure of the heat exchange shell in the present invention; Figure 5 It is a schematic diagram of the internal cross-sectional structure of the heating tank 1 and the heating tank 2 in the present invention; Figure 6 It is a schematic diagram of a partial internal cross-sectional structure of a steam valve in the present invention; Figure 7 It is a schematic diagram of the partial internal cross-sectional structure of the ash discharge pipe and the heat exchange barrel in the present invention.

[0017] In the figure: 1. flue gas duct; 2. return pipe; 3. heat exchange barrel; 4. heat exchange shell; 5. steam discharge pipe; 6. steam valve; 7. fin ring; 8. heating tank one; 9. heating tank two; 10. water inlet pipe one; 11. water inlet pipe two; 12. heating threaded sheet; 13. one-way valve one; 14. one-way valve two; 15. exhaust pipe one; 16. exhaust pipe two; 17. steering pipe; 18. guide pipe; 19. plug; 20. baffle plate; 21. mixing pipe; 22. smoke exhaust port; 23. cleaning ring; 24. ash discharge pipe; 25. transmission shaft; 26. threaded blade; 27. convex teeth; 28. sealing sheet; 29. ​​base; 30. motor. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0019] Embodiment 1, as Figures 1 to 7 As shown, this embodiment proposes a waste heat recovery device for a coke oven riser, comprising a flue gas duct 1, the flue gas duct 1 is connected to the coke oven riser, and also comprises a return pipe 2, a heat exchange barrel 3, a heat exchange mechanism and a ash removal and discharge mechanism, the return pipe 2 is connected to the flue gas duct 1, the lower side of the heat exchange barrel 3 is connected to the return pipe 2, a smoke exhaust port 22 is arranged on the top of the heat exchange barrel 3, the bottom of the heat exchange barrel 3 is arranged in a cone shape, the heat exchange mechanism is arranged on the side of the heat exchange barrel 3 away from the flue gas duct 1, the heat exchange mechanism is in contact with the flue gas, and the heat exchange mechanism is used to absorb heat in the flue gas, wherein the heat exchange mechanism comprises a heat exchange shell 4 and a steam exhaust pipe 5, the heat exchange shell 4 is fixedly connected to the heat exchange barrel 3, and the heat exchange shell 4 is fixedly connected to the heat exchange barrel 3. The shell 4 is configured to be barrel-shaped, the steam exhaust block is fixedly arranged on the heat exchange shell 4, the steam exhaust pipe 5 passes through the heat exchange shell 4 and the heat exchange barrel 3, the steam exhaust pipe 5 is used to communicate with external equipment utilizing steam, the ash cleaning exhaust mechanism is arranged on the heat exchange barrel 3, the ash cleaning exhaust mechanism extends into the heat exchange barrel 3, the ash cleaning exhaust mechanism is slidably connected to the heat exchange shell 4, the ash cleaning exhaust mechanism is used to remove dust on the heat exchange shell 4 and discharge it from the heat exchange barrel 3, the dust can be prevented from falling back into the riser by bending the return pipe 2, the heat in the flue gas is transferred to the heat exchange shell 4, the dust in the flue gas attached to the heat exchange shell 4 is cleaned by the ash cleaning exhaust mechanism, and the flue gas is prevented from being discharged in large quantities along with the dust.

[0020] like Figures 1 to 4As shown, the heat exchange mechanism also includes a steam valve 6, a heat absorption component and a fin ring 7. The steam valve 6 is arranged in the heat exchange shell 4, and the steam valve 6 is connected to the steam discharge pipe 5. The heat absorption component is arranged in the heat exchange shell 4, and the steam valve 6 is connected to the heat absorption component. The heat absorption component is used to fully absorb the heat on the heat exchange shell 4. A plurality of fin rings 7 are arranged, and the side and bottom of the heat exchange shell 4 are respectively fixedly connected with a plurality of fin rings 7. The dust removal discharge mechanism is in contact with the fin ring 7. The heat absorption component includes a heating tank 1 8, a heating tank 2 9, a water inlet pipe 10, a water inlet pipe 2 11 and a heating screw The pattern sheet 12, the heating groove 1 is opened at the bottom of the heat exchange shell 4, the heating groove 1 8 is set to a semicircular shape, the heating groove 2 9 is opened at the bottom of the heat exchange shell 4, the heating groove 2 9 is set to a semicircular shape, the heating groove 1 8 and the heating groove 2 9 are combined into a cone, the water inlet pipe 10 is fixedly connected to the heat exchange shell 4, the water inlet pipe 10 is threadedly arranged in the heat exchange shell 4, one end of the water inlet pipe 10 is connected to the side of the heating groove 1 8, and the other end passes through the heat exchange shell 4 and then passes through the heat exchange barrel 3, the water inlet pipe 2 11 is fixedly connected to the heat exchange shell 4, and the water inlet pipe 2 11 is threadedly arranged in the heat exchange shell 4. In the shell 4, one end of the water inlet pipe 11 is connected to the side of the heating tank 29, and the other end passes through the heat exchange shell 4 and then passes through the heat exchange barrel 3. The heating threaded sheet 12 is fixedly connected to the inside of the heat exchange shell 4. The heating threaded sheet 12 is arranged in a threaded manner. The water inlet pipe 10 and the water inlet pipe 2 11 are spirally wound. The heating threaded sheet 12 and the water inlet pipe 10 and the water inlet pipe 2 11 are close to each other. The water inlet pipe 10 and the water inlet pipe 2 11 are heated by the heating threaded sheet 12. The water moves downward relatively in the water inlet pipe 10 and the water inlet pipe 2 11, and the temperature of the water gradually increases. When the water enters the heating After being in the tank 1 8 and the heating tank 2 9, the flue gas first contacts with the flue gas entering the heat exchange barrel 3, and has the highest temperature. The water converted into steam will gather at the top of the heating tank 1 8 and the heating tank 2 9. The flue gas flows from bottom to top, and as the heat is gradually absorbed, the temperature gradually decreases. The length of the water heated before entering the heating tank 1 8 and the heating tank 2 9 can be adjusted by setting the number of turns and the length of the water inlet pipe 1 10 and the water inlet pipe 2 11 in a threaded shape, so as to prevent the water from evaporating into steam due to the heat in the threaded section, or the water inlet pipe 1 10 and the water inlet pipe 2 11 do not use threaded sections, and straight pipes can be used.

[0021] like Figures 3 to 5As shown, a one-way valve 13 is installed on one end of the water inlet pipe 10 extending out of the heat exchange barrel 3, and a one-way valve 2 14 is installed on one end of the water inlet pipe 2 11 extending out of the heat exchange barrel 3. An exhaust pipe 15 is connected to the top of the heating tank 1 8, and an exhaust pipe 2 16 is connected to the top of the heating tank 2 9. The exhaust pipe 15 and the exhaust pipe 2 16 are both connected to the steam valve 6. The one-way valve 13 and the one-way valve 2 14 are for water to flow only toward the inside of the heat exchange barrel 3. The exhaust pipe 15 and the exhaust pipe 2 16 are respectively connected to the top of the heating tank 1 8 and the heating tank 2 9 but do not extend into the bottom of the heating tank 1 8 and the heating tank 2 9, so that only steam enters the exhaust pipe 15 and the exhaust pipe 2 16. When high-temperature hot water is needed, the exhaust pipe 15 and the exhaust pipe 2 16 can be arranged to extend into the heating tank 1 8 and the heating tank 2 9 respectively. At the bottom, when the water temperature rises and turns into steam, it will squeeze the hot water at the bottom of heating tank 1 8 and heating tank 2 9 into the steam valve 6. As the amount of water decreases, the contact area between water and heat exchange shell 4 decreases, and the amount of steam cannot be maintained. The steam condenses into water, and the air pressure decreases to absorb the water in water inlet pipe 1 10 and water inlet pipe 2 11. At the same time, since the temperature of the incoming water is lower than that of the steam, the steam condenses and continues to absorb water. When the water is heated and turned into steam again, the hot water at the bottom of heating tank 1 8 and heating tank 2 9 is pushed into the steam valve 6 again. In the same way, the steam is pushed into the steam valve 6, and the high-temperature steam is pushed into the steam valve 6 by using the repeated changes in water temperature. Due to the repeated changes in water temperature, there are gaps in the transportation of steam, so heating tank 1 8 and heating tank 2 9 are used, and continuous steam supply can be achieved through the regulation of steam valve 6.

[0022] like Figures 5 and 6As shown, the steam valve 6 is provided with a steering tube 17, a guide tube 18, a plug 19, a baffle plate 20 and a mixing tube 21. Two steering tubes 17 are provided, and the two steering tubes 17 are arranged opposite to each other. The two steering tubes 17 are respectively connected to the exhaust pipe 15 and the exhaust pipe 2 16. Each steering tube 17 is fixedly connected with a guide tube 18, and the two guide tubes 18 are arranged opposite to each other. A plug 19 is slidably connected in each guide tube 18, and the plug 19 is detachably connected to the steering tube 17. The baffle plate 20 is fixedly connected between the two guide tubes 18. The two baffle plates 20 are fixedly connected between the two guide tubes 18. The plugs 19 are respectively arranged on both sides of the baffle plate 20, and a spring 1 is fixedly connected between the plug 19 and the baffle plate 20. The two plugs 19 can pass through the baffle plate 20. The mixing tube 21 is connected to the two guide tubes 18, and the steam discharge pipe 5 is connected to the mixing tube 21. The baffle plate 20 is arranged in the mixing tube 21. The edge of the plug 19 does not contact the guide tube 18. When the plug 19 is pushed to separate from the steering tube 17, the steam can flow into the mixing tube 21 through the gap between the plug 19 and the guide tube 18. A through hole is opened in the center of the baffle plate 20. One end close to spring one can pass through the through hole. For example, the water temperature in heating tank one 8 rises, and the amount of steam increases, pushing the plug 19 to squeeze the spring one. At this time, the plug 19 connected to heating tank one 8 also contacts and squeezes the plug 19 connected to heating tank two 9. At this time, the water temperature in heating tank two 9 rises, and the steam pressure increases, pushing the plug 19. The thrust of the plug 19 connected to heating tank two 9 gradually increases, pushing the plug 19 connected to heating tank one 8 in the opposite direction. At the same time, a large amount of steam in the heating tank one 8 is discharged, and the thrust is reduced. 19 pushes the plug 19 connected to the heating tank 1 8 to contact the steering tube 17. At this time, the pressure in the heating tank 1 8 gradually increases. This is repeated, so that the steam flow in the mixing tube 21 is intermittently reduced. At the same time, through the mutual push of the two plugs 19, the plug 19 can be pushed open only when the air pressure in the heating tank 1 8 or the heating tank 2 9 needs to be larger, thereby ensuring the temperature of the steam. When the steam pressure in the heating tank 1 8 is the same as that in the heating tank 2 9, the two plugs 19 are both pushed, and the steam on both sides enters the mixing tube 21 at the same time, which does not affect the normal discharge of the steam.

[0023] like Figure 3 and Figure 7As shown, the ash cleaning and discharging mechanism includes a cleaning ring 23, an ash discharging pipe 24, a transmission shaft 25 and an ash discharging anti-leakage component. The cleaning ring 23 is sleeved on the heat exchange shell 4, the cleaning ring 23 is fitted with multiple fin rings 7, the ash discharging pipe 24 is connected to the bottom center of the heat exchange barrel 3, the transmission shaft 25 is fixedly connected to the cleaning ring 23, the transmission shaft 25 passes through the ash discharging pipe 24, the ash discharging anti-leakage component is arranged on the transmission shaft 25 and the ash discharging pipe 24, the ash discharging anti-leakage component is used to prevent the smoke and dust from being discharged at the same time when the dust is discharged from the heat exchange barrel 3, and the cleaning ring 23 scrapes the surface of the heat exchange shell 4 when rotating so that the dust falls and gathers at the bottom of the heat exchange barrel 3.

[0024] like Figure 3 and Figure 7 As shown, the ash discharge anti-leakage component includes a threaded blade 26, a convex tooth 27 and a sealing sheet 28. The threaded blade 26 is fixedly connected to the transmission shaft 25, and the threaded blade 26 is arranged in the ash discharge pipe 24. The convex tooth 27 is fixedly connected below the threaded blade 26. The sealing sheet 28 is sleeved on the transmission shaft 25. The sealing sheet 28 is arranged on the lower side of the ash discharge pipe 24 and is detachably connected to the ash discharge pipe 24. The side of the sealing sheet 28 close to the threaded blade 26 is fixedly connected with the convex tooth 27. The convex tooth 27 on the threaded blade 26 can contact the convex tooth 27 on the sealing sheet 28. A base 29 is arranged below the ash discharge pipe 24, and the transmission shaft 25 passes through the base 29. There is a gap between the base 29 and the sealing sheet 28. A spring 2 is fixedly connected between the two ends of the base 29, and a motor 30 is fixedly connected under the base 29. The output end of the motor 30 is fixedly connected to the transmission shaft 25. When the output end of the motor 30 drives the transmission shaft 25 to rotate, the cleaning ring 23 sweeps the dust off, and the propeller blades transport the dust downward in the ash discharge pipe 24. The sealing sheet 28 is fitted with the ash discharge pipe 24 under the push of the spring 2 to prevent the smoke from being discharged through the ash discharge pipe 24. When the propeller blades contact the convex teeth 27 on the sealing sheet 28, they squeeze the sealing sheet 28 downward, so that the sealing sheet 28 is temporarily separated from the ash discharge pipe 24, and the smoke blows the dust in the ash discharge pipe 24 out. A channel surrounding the ash discharge pipe 24 is provided on the base 29 to prevent dust from flying around.

[0025] In this embodiment, the flue gas contacts the heat exchange shell 4 after passing through the return pipe 2 to prevent dust from falling into the riser. The heating tank 1 8 and the heating tank 2 9 are arranged at the bottom of the heat exchange shell 4, so that the water temperature in the heating tank 1 8 and the heating tank 2 9 is higher than the water in the water inlet pipe 10 and the water inlet pipe 2 11. After the water is converted into steam, it is discharged into the steam valve 6 through the exhaust pipe 15 and the exhaust pipe 2 16. According to the different pressures of the steam in the heating tank 1 8 and the heating tank 2 9, the exhaust pipe 15 and the exhaust pipe 2 16 are staggered to discharge steam. The two plugs 19 can be squeezed against each other, so that the heating tank 1 8 and the heating tank 2 9 can alternately discharge steam, ensuring the continuity of steam discharge, and further ensuring that the pressure and temperature of the steam are high during discharge. The threaded paddle 26 intermittently pushes the sealing sheet 28, so that the dust can be discharged from the gap between the sealing sheet 28 and the ash discharge pipe 24, avoiding a large amount of smoke leakage when discharging dust.

[0026] Embodiment 2: Embodiment 2 of the present application is supplemented on the basis of Embodiment 1 and is a waste heat recovery process of a coke oven riser: Step 1: Smoke diversion: Smoke enters the return pipe 2 through the smoke pipe 1, and then enters the heat exchange barrel 3 and contacts the heat exchange shell 4; Step 2, flue gas heat exchange: the flue gas contacts the fin ring 7, conducts the heat to the heat exchange shell 4, and the water in the water inlet pipe 1 10, the water inlet pipe 2 11, the heating tank 1 8 and the heating tank 2 9 is heated; Step 3, heating and evaporation: After the water in the heating tank 1 8 and the heating tank 2 9 is heated and evaporated into water vapor, the pressure in the heating tank 1 8 and the heating tank 2 9 increases, and the steam is discharged to the steam valve 6 through the exhaust pipe 1 15 and the exhaust pipe 2 16; Step 4, steam discharge: When the steam pressure is high, it will push the plug 19, and the plug 19 will squeeze the spring 1, so that the plug 19 and the steering tube 17 are separated, and the steam flows between the plug 19 and the guide tube 18 to the mixing tube 21. When the steam pressure is low, the thrust on the plug 19 is reduced, the plug 19 contacts the steering tube 17, and the steam stops being discharged; Step 5, alternate discharge: when the steam pressure in the steering tube 17 on one side is relatively large, the plug 19 on one side squeezes the spring 1, and the plug 19 contacts the plug 19 on the other side, so that the plug 19 on the other side cannot be separated from the steering tube 17. As the steam is discharged from the steering tube 17 on one side, the pressure decreases. When the steam pressure in the steering tube 17 on one side is less than the steam pressure in the steering tube 17 on the other side, the plug 19 on the other side pushes the plug 19 on one side to move, so that steam is discharged from the guide tube 18 on the other side, and the steam is stopped from being discharged from the guide tube 18 on one side, and the two plugs 19 move alternately. Step 6, alternating hot and cold water: when the steam pressure in the heating tank 8 is high, as the steam is discharged through the guide pipe 18, the amount of water in the heating tank 8 decreases. When the amount of water cannot maintain enough steam, the pressure in the heating tank 8 decreases. At this time, water is sucked into the heating tank 8 through the one-way valve 13 for heating. After the water temperature rises, the steam is discharged through the exhaust pipe 15. The heating tank 8 and the heating tank 2 9 alternately absorb water, heat, and discharge steam. Step 7, dust cleaning: The output end of the motor 30 drives the transmission shaft 25 to rotate, and the cleaning ring 23 sweeps the dust on the fin ring 7 to the dust discharge pipe 24; Step 8, dust discharge: When the threaded paddle 26 rotates, it pushes the dust to move downward. When the convex teeth 27 on the threaded paddle 26 rotate, they contact the convex teeth 27 on the sealing sheet 28, pushing the sealing sheet 28 to squeeze the spring 2, and the sealing sheet 28 is separated from the ash discharge pipe 24. At this time, the dust is discharged. When the convex teeth 27 on the threaded paddle 26 separate from the convex teeth 27 on the sealing sheet 28, the sealing sheet 28 fits with the ash discharge pipe 24 under the push of the spring 2.

[0027] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. 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 waste heat recovery device for a coke oven riser, comprising a flue gas duct (1), wherein the flue gas duct (1) is connected to the coke oven riser, and characterized in that: Also includes: A return pipe (2), the return pipe (2) being connected to the flue gas duct (1); A heat exchange barrel (3), the lower side of the heat exchange barrel (3) being connected to the return pipe (2); The top of the heat exchange barrel (3) is provided with a smoke exhaust port (22), and the bottom of the heat exchange barrel (3) is arranged in a conical shape; A heat exchange mechanism, the heat exchange mechanism being arranged on a side of the heat exchange barrel (3) away from the flue gas duct (1), the heat exchange mechanism being in contact with the flue gas, and being used to absorb heat from the flue gas; Wherein, the heat exchange mechanism comprises: A heat exchange shell (4), the heat exchange shell (4) being fixedly connected to the heat exchange barrel (3), the heat exchange shell (4) being configured in a barrel shape; a steam discharge pipe (5), the steam discharge block being fixedly arranged on the heat exchange shell (4), the steam discharge pipe (5) passing through the heat exchange shell (4) and the heat exchange barrel (3), the steam discharge pipe (5) being used to communicate with external equipment utilizing steam; A dust removal and discharge mechanism, the dust removal and discharge mechanism is arranged on the heat exchange barrel (3), the dust removal and discharge mechanism extends into the heat exchange barrel (3), the dust removal and discharge mechanism is slidably connected to the heat exchange shell (4), and the dust removal and discharge mechanism is used to remove dust on the heat exchange shell (4) and discharge it from the heat exchange barrel (3).

2. The waste heat recovery device for a coke oven riser according to claim 1, characterized in that: The heat exchange mechanism also includes: a steam valve (6), the steam valve (6) being arranged in the heat exchange shell (4), the steam valve (6) being connected to the steam discharge pipe (5); a heat absorbing component, the heat absorbing component being arranged in the heat exchange shell (4), the steam valve (6) being connected to the heat absorbing component, and the heat absorbing component being used to fully absorb the heat on the heat exchange shell (4); A fin ring (7), wherein a plurality of the fin rings (7) are provided, and the sides and the bottom of the heat exchange shell (4) are respectively fixedly connected with the plurality of the fin rings (7), and the dust removal mechanism is in contact with the fin rings (7).

3. The waste heat recovery device for a coke oven riser according to claim 2, characterized in that: The heat absorption component comprises: A heating groove (8), wherein the heating groove (8) is disposed at the bottom of the heat exchange shell (4), and the heating groove (8) is configured in a semicircular shape; A second heating groove (9), wherein the second heating groove (9) is disposed at the bottom of the heat exchange shell (4), the second heating groove (9) is configured to be semicircular, and the first heating groove (8) and the second heating groove (9) are combined into a cone; A water inlet pipe (10), the water inlet pipe (10) being fixedly connected to the heat exchange shell (4), the water inlet pipe (10) being threadedly arranged in the heat exchange shell (4), one end of the water inlet pipe (10) being connected to the side of the heating tank (8), and the other end of the water inlet pipe (10) passing through the heat exchange shell (4) and then penetrating the heat exchange barrel (3); A second water inlet pipe (11), the second water inlet pipe (11) being fixedly connected to the heat exchange shell (4), the second water inlet pipe (11) being threadedly arranged in the heat exchange shell (4), one end of the second water inlet pipe (11) being connected to the side of the second heating tank (9), and the other end of the second water inlet pipe (11) passing through the heat exchange shell (4) and then penetrating the heat exchange barrel (3); A heating threaded plate (12), wherein the heating threaded plate (12) is fixedly connected to the inside of the heat exchange shell (4), and the heating threaded plate (12) is arranged in a threaded manner.

4. The waste heat recovery device for a coke oven riser according to claim 3, characterized in that: One-way valve one (13) is installed on one end of the water inlet pipe one (10) extending out of the heat exchange barrel (3), and one-way valve two (14) is installed on one end of the water inlet pipe two (11) extending out of the heat exchange barrel (3).

5. The waste heat recovery device for a coke oven riser according to claim 4, characterized in that: The top of the heating tank 1 (8) is connected to an exhaust pipe 1 (15), and the top of the heating tank 2 (9) is connected to an exhaust pipe 2 (16). Both the exhaust pipe 1 (15) and the exhaust pipe 2 (16) are connected to the steam valve (6).

6. A waste heat recovery device for a coke oven riser according to claim 5, characterized in that: The steam valve (6) is provided with: A steering tube (17), wherein two steering tubes (17) are provided, the two steering tubes (17) are arranged opposite to each other, and the two steering tubes (17) are respectively connected to the exhaust pipe 1 (15) and the exhaust pipe 2 (16); A flow guide pipe (18), each of the steering pipes (17) being fixedly connected to a flow guide pipe (18), and the two flow guide pipes (18) being arranged opposite to each other; A plug (19), each of the guide tubes (18) is slidably connected to a plug (19), and the plug (19) is detachably connected to the steering tube (17); a blocking piece (20), the blocking piece (20) being fixedly connected between the two flow guide pipes (18), the two plugs (19) being respectively arranged on both sides of the blocking piece (20), a spring 1 being fixedly connected between the plug (19) and the blocking piece (20), and the two plugs (19) being able to pass through the blocking piece (20); A mixing tube (21), the mixing tube (21) being connected to the two flow guide tubes (18), the steam discharge tube (5) being connected to the mixing tube (21), and the blocking piece (20) being arranged in the mixing tube (21).

7. The waste heat recovery device for a coke oven riser according to claim 6, characterized in that: The dust removal mechanism comprises: A cleaning ring (23), the cleaning ring (23) being sleeved on the heat exchange shell (4), the cleaning ring (23) being in contact with the plurality of fin rings (7); an ash discharge pipe (24), the ash discharge pipe (24) being connected to the center of the bottom of the heat exchange barrel (3); a transmission shaft (25), the transmission shaft (25) being fixedly connected to the cleaning ring (23), the transmission shaft (25) passing through the ash discharge pipe (24); An ash discharge anti-leakage component, the ash discharge anti-leakage component is arranged on the transmission shaft (25) and the ash discharge pipe (24), and the ash discharge anti-leakage component is used to prevent smoke and dust from being discharged simultaneously when dust is discharged from the heat exchange barrel (3).

8. The waste heat recovery device for a coke oven riser according to claim 7, characterized in that: The ash discharge and anti-leakage assembly comprises: a threaded blade (26), the threaded blade (26) being fixedly connected to the transmission shaft (25), and the threaded blade (26) being arranged in the ash discharge pipe (24); A convex tooth (27), the convex tooth (27) being fixedly connected below the threaded blade (26); A sealing sheet (28), wherein the sealing sheet (28) is sleeved on the transmission shaft (25), the sealing sheet (28) is arranged on the lower side of the ash discharge pipe (24) and is detachably connected to the ash discharge pipe (24), the convex teeth (27) being fixedly connected to one side of the sealing sheet (28) close to the threaded blade (26), and the convex teeth (27) on the threaded blade (26) are capable of contacting the convex teeth (27) on the sealing sheet (28).

9. The waste heat recovery device for a coke oven riser according to claim 8, characterized in that: A base (29) is provided below the ash discharge pipe (24), the transmission shaft (25) passes through the base (29), a second spring is fixedly connected between the base (29) and the sealing sheet (28), a motor (30) is fixedly connected below the base (29), and an output end of the motor (30) is fixedly connected to the transmission shaft (25).

10. A waste heat recovery process for a coke oven riser, using the waste heat recovery device for a coke oven riser according to claim 9, characterized in that: The following steps are involved: S1, smoke diversion: the smoke enters the return pipe (2) through the smoke pipe (1), and then the smoke enters the heat exchange barrel (3) and contacts the heat exchange shell (4); S2, flue gas heat exchange: the flue gas contacts the fin ring (7) and conducts heat to the heat exchange shell (4), and the water in the water inlet pipe 1 (10), the water inlet pipe 2 (11), the heating tank 1 (8) and the heating tank 2 (9) is heated; S3, heating and evaporation: after the water in the heating tank 1 (8) and the heating tank 2 (9) is heated and evaporated into water vapor, the pressure in the heating tank 1 (8) and the heating tank 2 (9) increases, and the steam is discharged to the steam valve (6) through the exhaust pipe 1 (15) and the exhaust pipe 2 (16); S4, steam discharge: when the steam pressure is relatively high, the plug (19) is pushed, and the plug (19) compresses the spring 1, so that the plug (19) and the steering tube (17) are separated, and the steam flows between the plug (19) and the guide tube (18) into the mixing tube (21). When the steam pressure is relatively low, the thrust on the plug (19) is reduced, the plug (19) contacts the steering tube (17), and the steam stops being discharged; S5, alternate discharge: when the steam pressure in the steering tube (17) on one side is relatively high, the plug (19) on one side presses the spring 1, and the plug (19) contacts the plug (19) on the other side, so that the plug (19) on the other side cannot be separated from the steering tube (17). As the steam is discharged from the steering tube (17) on one side, the pressure decreases. When the steam pressure in the steering tube (17) on one side is lower than the steam pressure in the steering tube (17) on the other side, the plug (19) on the other side pushes the plug (19) on one side to move, so that steam is discharged from the guide tube (18) on the other side, and the steam discharge from the guide tube (18) on one side stops. The two plugs (19) move alternately; S6, alternating hot and cold water: when the steam pressure in the heating tank 1 (8) is relatively high, as the steam is discharged through the guide pipe (18), the amount of water in the heating tank 1 (8) decreases. When the amount of water cannot maintain enough steam, the pressure in the heating tank 1 (8) decreases. At this time, water is sucked into the heating tank 1 (8) through the one-way valve 1 (13) for heating. After the water temperature rises, the steam is discharged through the exhaust pipe 1 (15). The heating tank 1 (8) and the heating tank 2 (9) alternately absorb water, heat, and discharge steam. S7, cleaning dust: the output end of the motor (30) drives the transmission shaft (25) to rotate, and the cleaning ring (23) sweeps the dust on the fin ring (7) to the dust discharge pipe (24); S8, dust discharge: when the threaded blade (26) rotates, the dust is pushed downward, and when the convex teeth (27) on the threaded blade (26) rotate, they contact the convex teeth (27) on the sealing sheet (28), pushing the sealing sheet (28) to press the second spring, and the sealing sheet (28) is separated from the dust discharge pipe (24). At this time, the dust is discharged. When the convex teeth (27) on the threaded blade (26) are separated from the convex teeth (27) on the sealing sheet (28), the sealing sheet (28) is pressed against the dust discharge pipe (24) under the push of the second spring.

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