Oil shale combustion waste heat recycling device of circulating fluidized bed boiler

Abstract

The utility model discloses a circulating fluidized bed boiler oil shale combustion waste heat recycling device which comprises a recycling box, a spherical shell is arranged in the middle of the interior of the recycling box, and a spherical inner container is arranged in the middle of the interior of the spherical shell. A mounting rod is fixed to the middle of the top of the spherical inner container and the middle of the top of the spherical shell, a bearing seat is mounted on the outer wall of the mounting rod, and scraping plates distributed at equal intervals are fixed to the outer wall of the bearing seat; according to the oil shale combustion waste heat recycling device of the circulating fluidized bed boiler, heat exchange can be more sufficiently conducted between tail gas and the spherical shell and the spherical inner container, heat is better conducted to water in the recycling box, the waste heat recycling efficiency is improved, effective recycling of tail gas waste heat generated by oil shale combustion of the circulating fluidized bed boiler is achieved, and the energy consumption is reduced. Part of tail gas can push the scraping plate to rotate, impurities and waste residues attached to the inner wall of the spherical shell and the outer wall of the spherical inner container are removed in time, and impurity accumulation is prevented.

Description

Technical Field

[0001] This utility model relates to the field of oil shale technology, specifically to a device for recovering and utilizing waste heat from oil shale combustion in a circulating fluidized bed boiler. Background Technology

[0002] Oil shale is a mineral resource with abundant reserves, formed from the sediment of mud deposited by the decomposition of aquatic plants, algae, and other lower organisms. Oil shale can be comprehensively developed and utilized for oil refining through dry distillation, semi-coke power generation, and organic fertilizer production.

[0003] Oil shale, as an important unconventional energy source, can be used as fuel for circulating fluidized bed boilers. However, traditional oil shale combustion equipment often focuses only on energy conversion during combustion, neglecting the recovery and utilization of waste heat generated during combustion. This not only results in significant energy waste but also increases production costs. In particular, the exhaust gas emitted after oil shale combustion contains a large amount of waste heat that is not effectively utilized and is directly emitted into the atmosphere, wasting energy and causing thermal pollution to the environment. Existing waste heat recovery devices generally use heat exchange to heat water to achieve waste heat recovery. However, when the exhaust gas circulates during the heat exchange process, impurities in the exhaust gas adhere to the heat exchange structure. Over time, the thickness of the impurity deposits on the wall increases, affecting the heat transfer rate and efficiency. Therefore, it is urgent to design a waste heat recovery device for circulating fluidized bed boiler oil shale combustion to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a device for recovering and utilizing waste heat from the combustion of oil shale in a circulating fluidized bed boiler, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a circulating fluidized bed boiler oil shale combustion waste heat recovery and utilization device, comprising a recovery box, a spherical outer shell disposed in the middle of the interior of the recovery box, and a spherical inner liner disposed in the middle of the interior of the spherical outer shell. An installation rod is fixed at the middle of the top of the spherical inner liner and the middle of the top of the spherical outer shell. A bearing seat is installed on the outer wall of the installation rod, and scraper plates are fixed at equal intervals on the outer wall of the bearing seat. The scraper plates fit into the gap between the inner wall of the spherical outer shell and the outer wall of the spherical inner liner. A U-shaped gas distribution pipe is fixed on one side of the spherical outer shell, and a tail gas inlet pipe extending out of the recovery box is fixed on one side of the gas distribution pipe. One end of the gas distribution pipe is tangent to the outer wall of the spherical inner liner, and the other end of the gas distribution pipe is located in the middle of one side of the spherical outer shell. A tail gas outlet pipe extending out of the recovery box is fixed in the middle of the other side of the spherical outer shell. A water injection pipe is fixed in the middle of the top of the recovery box, and a drain pipe is fixed in the bottom of one side of the recovery box.

[0006] By adopting the above technical solution, impurities and waste residues adhering to the inner wall of the spherical outer shell and the outer wall of the spherical inner liner are removed in a timely manner, preventing the accumulation of impurities from affecting the heat exchange efficiency and ensuring the continuous and efficient operation of the device.

[0007] The present invention is further configured such that heat-conducting grooves are provided at equal intervals and distributed in an annular pattern at the top and bottom of the spherical shell, and heat-conducting plates are installed on the inner walls of the heat-conducting grooves, with the top ends of the heat-conducting plates installed on the inner wall of the recycling bin.

[0008] By adopting the above technical solution, heat is better transferred to the water in the recovery tank, thus improving the waste heat recovery efficiency.

[0009] The present invention is further configured such that the interior of the spherical inner liner is provided with heat-insulating filler, the recycling box is composed of an outer shell and an inner liner, and a heat-insulating layer is provided at the gap between the outer shell and the inner liner.

[0010] By adopting the above technical solution, heat can be stored and released, the internal temperature can be stabilized, and the heat loss to the outside can be reduced. This ensures that the heat inside the device will not be easily lost, which helps to maintain the stability of the waste heat recovery process and further improves the efficiency of waste heat utilization.

[0011] The present invention is further configured such that a discharge pipe extending from the recycling bin is fixed at the bottom center of the spherical shell, and a waste collection bin is installed at the bottom of the discharge pipe.

[0012] By adopting the above technical solution, it is convenient to collect impurities and waste residue in a centralized manner.

[0013] The present invention is further provided that a discharge pipe is provided at the bottom of one side of the waste residue collection box, and a sealing cap is provided on one side of the discharge pipe.

[0014] By adopting the above technical solution, it is easier to remove the waste residue.

[0015] The present invention is further configured such that an electric push rod is fixedly installed on the outer wall of the other side of the waste residue collection box, and a pusher seat that fits against the inner wall of the waste residue collection box is fixedly installed on the piston end of the electric push rod.

[0016] By adopting the above technical solution, it is easier to centrally discharge waste residue.

[0017] The present invention is further configured such that an observation port is provided on one side of the waste residue collection box, and an observation window is installed on the inner wall of the observation port; support legs are installed at the four corners of the bottom of the recycling box, and a support frame is installed on one side of the support legs and the bottom of the waste residue collection box.

[0018] By adopting the above technical solution, it is easier to observe the storage status of waste residue in the waste residue collection box and to reasonably arrange the waste residue cleaning time.

[0019] The present invention is further configured such that a controller is installed on one outer wall of the recycling bin, and the controller is electrically connected to the electric push rod.

[0020] By adopting the above technical solution, it is easier to control the operation of the electric actuator.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. This circulating fluidized bed boiler oil shale combustion waste heat recovery and utilization device introduces exhaust gas into the space between the spherical inner liner and the spherical outer shell through the exhaust gas inlet pipe, allowing the exhaust gas to flow within it. The spherical structure increases the contact area between the exhaust gas and water, and through the cooperation of heat conduction grooves and heat conduction plates, the exhaust gas can more fully exchange heat with the spherical outer shell and the spherical inner liner, thereby better transferring heat to the water in the recovery tank, improving the waste heat recovery efficiency, and realizing the effective recovery of waste heat generated by the combustion of oil shale in the circulating fluidized bed boiler. The design of one end of the gas distribution pipe being tangent to the outer wall of the spherical inner liner allows some of the exhaust gas to drive the scraper to rotate, promptly removing impurities and waste residues adhering to the inner wall of the spherical outer shell and the outer wall of the spherical inner liner, preventing impurity accumulation from affecting heat exchange efficiency, ensuring the continuous and efficient operation of the device, and also reducing the risk of equipment failure due to impurity accumulation.

[0023] 2. This circulating fluidized bed boiler oil shale combustion waste heat recovery and utilization device can store and release heat by setting up a heat-insulating filling material made of phase change energy storage material inside the spherical inner tank, stabilizing the internal temperature. The heat-insulating layer on the recovery box reduces the heat loss to the outside, ensuring that the heat inside the device will not be easily lost, which helps to maintain the stability of the waste heat recovery process and further improves the waste heat utilization efficiency. Attached Figure Description

[0024] Figure 1 This is a perspective view of the present utility model;

[0025] Figure 2 This is a cross-sectional view of the present invention;

[0026] Figure 3 This is a schematic diagram of the heat-conducting groove and gas distribution pipe structure of this utility model;

[0027] Figure 4 This is a schematic diagram of the spherical inner liner and scraper of this utility model;

[0028] Figure 5 This is a top sectional view of the present invention;

[0029] Figure 6 This is a schematic diagram of the sealing cover and observation window structure of this utility model;

[0030] Figure 7 This is a schematic diagram of the insulation layer structure of this utility model.

[0031] In the diagram: 1. Recycling bin; 101. Outer shell; 102. Insulation layer; 103. Inner liner; 2. Exhaust gas inlet pipe; 3. Water inlet pipe; 4. Exhaust gas outlet pipe; 5. Drainage pipe; 6. Support frame; 7. Waste collection bin; 8. Controller; 9. Spherical outer shell; 10. Heat-conducting plate; 11. Scraper; 12. Spherical inner liner; 13. Insulation filler; 14. Electric push rod; 15. Pusher seat; 16. Feeding pipe; 17. Discharge pipe; 18. Bearing; 19. Mounting rod; 20. Heat-conducting groove; 21. Gas distribution pipe; 22. Sealing cover; 23. Observation window. Detailed Implementation

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

[0033] Please see Figures 1-7This utility model provides a technical solution: a circulating fluidized bed boiler oil shale combustion waste heat recovery and utilization device, including a recovery box 1, a spherical outer shell 9 disposed in the middle of the interior of the recovery box 1, and a spherical inner liner 12 disposed in the middle of the interior of the spherical outer shell 9. An installation rod 19 is fixed at the middle of the top of the spherical inner liner 12 and the middle of the top of the spherical outer shell 9. A bearing seat 18 is installed on the outer wall of the installation rod 19, and scraper plates 11 are fixed at equal intervals on the outer wall of the bearing seat 18. The scraper plates 11 fit into the gap between the inner wall of the spherical outer shell 9 and the outer wall of the spherical inner liner 12. A U-shaped gas distribution pipe 21 is fixed on one side of the spherical outer shell 9, and a tail gas inlet pipe 2 extending out of the recovery box 1 is fixed on one side of the gas distribution pipe 21. One end of the gas distribution pipe 21 is tangent to the outer wall of the spherical inner liner 12, and the other end of the gas distribution pipe 21 is located on the spherical outer shell 9. At the middle of one side of the outer shell 9 and at the middle of the other side of the spherical outer shell 9, an exhaust pipe 4 extending out of the recovery box 1 is fixed. The top and bottom of the spherical outer shell 9 are provided with equally spaced annularly distributed heat-conducting grooves 20, and heat-conducting plates 10 are installed on the inner wall of the heat-conducting grooves 20. The top of the heat-conducting plates 10 is installed on the inner wall of the recovery box 1. A water injection pipe 3 is fixed at the middle of the top of the recovery box 1, and a drain pipe 5 is fixed at the bottom of one side of the recovery box 1. A discharge pipe 16 extending out of the recovery box 1 is fixed at the middle of the bottom of the spherical outer shell 9, and a waste collection box 7 is installed at the bottom of the discharge pipe 16. The design of one end of the gas distribution pipe 21 being tangent to the outer wall of the spherical inner liner 12 allows some exhaust gas to drive the scraper plate 11 to rotate, promptly removing impurities and waste residues adhering to the inner wall of the spherical outer shell 9 and the outer wall of the spherical inner liner 12, preventing the accumulation of impurities from affecting the heat exchange efficiency.

[0034] To achieve insulation and prevent heat loss, refer to Figure 2 , Figure 5 and Figure 7 The spherical inner liner 12 is filled with heat-insulating filler 13, which is made of phase change energy storage material. The recovery box 1 is composed of an outer shell 101 and an inner liner 103. A heat-insulating layer 102 is provided at the gap between the outer shell 101 and the inner liner 103. The heat-insulating filler 13 can store and release heat, stabilize the internal temperature, and the heat-insulating layer 102 reduces the loss of heat to the outside, ensuring that the heat inside the device will not be easily lost. This helps to maintain the stability of the waste heat recovery process and further improves the waste heat utilization efficiency.

[0035] To facilitate the discharge of waste residue, refer to Figure 1 , Figure 2 and Figure 6A discharge pipe 17 is provided at the bottom of one side of the waste collection box 7, and a sealing cover 22 is provided on one side of the discharge pipe 17. An electric push rod 14 is fixedly installed on the outer wall of the other side of the waste collection box 7, and a pusher seat 15 that fits against the inner wall of the waste collection box 7 is fixedly installed at the piston end of the electric push rod 14. A controller 8 is installed on the outer wall of one side of the recycling box 1, and the controller 8 is electrically connected to the electric push rod 14. The controller 8 controls the electric push rod 14 to work, and the electric push rod 14 pushes the pusher seat 15 to push the waste to the discharge pipe 17 at the bottom of one side of the waste collection box 7, so as to facilitate the centralized discharge of waste.

[0036] To facilitate operators' observation of the waste residue storage status within waste residue collection bin 7, refer to... Figure 6 An observation opening is provided on one side of the waste collection box 7, and an observation window 23 is installed on the inner wall of the observation opening. Support legs are installed at the four corners of the bottom of the recycling box 1, and a support frame 6 is installed on one side of the support legs and the bottom of the waste collection box 7. The observation window 23 facilitates observation of the storage of waste in the waste collection box 7 and allows for reasonable scheduling of waste cleaning time.

[0037] In summary, the working principle of this utility model is as follows: the exhaust gas generated by the combustion of oil shale in a circulating fluidized bed boiler enters the spherical shell 9 through the exhaust gas inlet pipe 2, and water is circulated in the device through the water injection pipe 3. Then, the heat is conducted to the recovery box 1 through the heat conduction grooves 20 that are evenly distributed in a ring at the top and bottom of the spherical shell 9 and the heat conduction plates 10 installed on the inner wall. Since the spherical structure increases the contact area between the exhaust gas and the device, heat exchange is fully carried out, and the waste heat of the exhaust gas is recovered and utilized. After heat exchange, the exhaust gas is discharged from the device through the exhaust gas outlet pipe 4 fixed in the middle of the other side of the spherical shell 9.

[0038] The heat-insulating filler 13, made of phase change energy storage material, can store and release heat when the temperature changes, thereby stabilizing the internal temperature of the spherical inner liner 12. The heat-insulating layer 102 set at the gap between the outer shell 101 and the inner liner 103 effectively reduces the loss of heat from the inside of the recycling box 1 to the outside.

[0039] During the exhaust gas flow and heat exchange process, the waste residue produced by combustion will gradually adhere to the inner wall of the spherical outer shell 9 and the outer wall of the spherical inner liner 12. At this time, the design of one end of the gas distribution pipe 21 being tangent to the outer wall of the spherical inner liner 12 allows some exhaust gas to drive the scraper plate 11 to rotate, promptly removing the impurities and waste residue adhering to the inner wall of the spherical outer shell 9 and the outer wall of the spherical inner liner 12. This allows the impurities and waste residue to fall into the waste residue collection box 7 along the discharge pipe 16 for collection. Then, the waste residue is observed through the observation window 23, which penetrates the capacity of the waste residue collection box 7. When it reaches the designated position, the controller 8 controls the electric push rod 14 to work. The electric push rod 14 pushes the pusher seat 15 to push the waste residue towards the discharge pipe 17 at the bottom of the waste residue collection box 7, making it easier to discharge the waste residue in a concentrated manner.

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

Claims

1. A circulating fluidized bed boiler oil shale combustion waste heat recovery device, comprising a recovery tank (1), characterized in that, The inside of the recycling box (1) is provided with a spherical shell (9), and the inside of the spherical shell (9) is provided with a spherical inner container (12), the top middle of the spherical inner container (12) is fixed with a mounting rod (19) at the top middle of the spherical shell (9), the outer wall of the mounting rod (19) is provided with a bearing seat (18), and the outer wall of the bearing seat (18) is fixed with a scraper (11) distributed at equal distances, the scraper (11) is matched with the inner wall of the spherical shell (9) and the outer wall of the spherical inner container (12) at the gap, one side of the spherical shell (9) is fixed with a U-shaped gas distribution pipe (21), and the other side of the gas distribution pipe (21) is fixed with a tail gas inlet pipe (2) extending out of the recycling box (1), one end of the gas distribution pipe (21) is tangent to the outer wall of the spherical inner container (12), and the other end of the gas distribution pipe (21) is located at the middle of the other side of the spherical shell (9), the middle of the other side of the spherical shell (9) is fixed with a tail gas outlet pipe (4) extending out of the recycling box (1), the top middle of the recycling box (1) is fixed with a water injection pipe (3), and the bottom of one side of the recycling box (1) is fixed with a drain pipe (5).

2. A circulating fluidized bed boiler oil shale combustion waste heat recovery and utilization device according to claim 1, characterized in that, The top and bottom of the spherical shell (9) are provided with heat-conducting grooves (20) distributed at equal distances in a ring shape, and the inner walls of the heat-conducting grooves (20) are provided with heat-conducting fins (10), and the top ends of the heat-conducting fins (10) are installed on the inner wall of the recycling box (1).

3. The oil shale combustion waste heat recovery and utilization device of a circulating fluidized bed boiler according to claim 1, characterized in that, The inside of the spherical inner container (12) is provided with a heat-insulating filler (13), the recycling box (1) is composed of a box shell (101) and a box inner container (103), and a heat-insulating layer (102) is arranged at the gap between the box shell (101) and the box inner container (103).

4. The oil shale combustion waste heat recovery and utilization device of a circulating fluidized bed boiler according to claim 1, characterized in that, The bottom middle of the spherical shell (9) is fixed with a discharging pipe (16) extending out of the recycling box (1), and the bottom of the discharging pipe (16) is provided with a waste residue collecting box (7).

5. A circulating fluidized bed boiler oil shale combustion waste heat recovery and utilization device according to claim 4, characterized in that, The bottom of one side of the waste residue collecting box (7) is provided with a discharging pipe (17), and one side of the discharging pipe (17) is provided with a sealing cover (22).

6. A circulating fluidized bed boiler oil shale combustion waste heat recovery and utilization device according to claim 5, characterized in that, The other side of the waste residue collecting box (7) is fixedly provided with an electric push rod (14), and the piston end of the electric push rod (14) is fixedly provided with a pushing seat (15) abutting the inner wall of the waste residue collecting box (7).

7. The oil shale combustion waste heat recovery and utilization device of a circulating fluidized bed boiler according to claim 6, characterized in that, An observation port is formed in one side of the waste residue collecting box (7), and an observation window (23) is installed on the inner wall of the observation port, and support legs are installed on the bottom of the recycling box (1), and the support legs are provided with a support frame (6) on the bottom of the waste residue collecting box (7).

8. The oil shale combustion waste heat recovery and utilization device of a circulating fluidized bed boiler according to claim 6, characterized in that, A controller (8) is installed on one side of the recycling box (1), and the controller (8) is electrically connected with the electric push rod (14).

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