Boiler coal cinder waste heat recovery device

Abstract

This utility model discloses a boiler slag waste heat recovery device, which relates to the field of waste heat recovery technology. It includes an outer casing, an inner casing, an isolation cylinder, a hot water pipe, and a material guiding assembly. Both the inner and outer casings are cylindrical shells, with the inner casing located inside the outer casing. The inner and outer casings are coaxial, with their upper and lower ends fixedly connected. A cavity is formed between the outer wall of the inner casing and the inner wall of the outer casing. A heat-conducting medium is placed inside the cavity. The hot water pipe is located inside the cavity and is coiled and fixed to the outer wall of the inner casing. The lower end of the hot water pipe has a water inlet and extends out of the outer casing. This utility model features an isolation cylinder at the center of the inner casing. The material guiding assembly guides the slag to the area between the inner casing sidewall and the isolation cylinder. Air is introduced from inside the isolation cylinder, enabling complete combustion of the slag and releasing energy, thus improving energy utilization. Simultaneously, the isolation cylinder brings the slag closer to the water pipe, improving thermal conductivity.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically a waste heat recovery device for boiler slag. Background Technology

[0002] Waste heat recovery from boiler slag is a process of efficiently extracting and reusing the thermal energy of high-temperature slag. Waste heat recovery not only improves energy efficiency but also reduces water consumption and environmental pollution during the cooling process.

[0003] In existing technologies, such as the patent with publication number CN211824000U, a high-temperature coal slag waste heat recovery and screening device is described, comprising a box body and an inner box. A support column is fixedly connected to the bottom of the box body, and the inner box is fixedly connected to the top of the support column. The top sides of the inner box are fixedly connected to the left and right sides of the box body… This patent achieves heat recovery by loading coal slag into the inner box and heating water pipes through indirect heat conduction.

[0004] However, the ash discharged from the boiler into the inner chamber contains some incompletely burned ash. The ash accumulates densely and thickly throughout the inner chamber, and there is insufficient air for it to burn completely, resulting in energy waste. At the same time, the ash in the center of the inner chamber is far from the water pipes, resulting in low heat transfer efficiency, more heat energy wasted, and low utilization rate. Utility Model Content

[0005] To address the aforementioned shortcomings of existing technologies, this utility model provides a boiler slag waste heat recovery device. An isolation cylinder is installed in the center of the inner box. The slag is guided to the position between the inner box side wall and the isolation cylinder by a material guiding component. Air is introduced from inside the isolation cylinder, which enables the slag to burn completely, releases energy, and improves energy utilization. At the same time, the isolation cylinder brings the slag closer to the water pipe, improving heat transfer rate.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A boiler slag waste heat recovery device includes an outer casing, an inner casing, an isolation cylinder, a hot water pipe, and a material guiding assembly. Both the inner and outer casings are cylindrical shells, with the inner casing located inside the outer casing. The inner and outer casings are coaxial, and their upper and lower ends are fixedly connected. A cavity is formed between the outer wall of the inner casing and the inner wall of the outer casing. A heat-conducting medium is placed within this cavity. The hot water pipe is located within the cavity and is coiled and fixed to the outer wall of the inner casing. The lower end of the hot water pipe has an inlet that extends through the outer casing and is connected to an external water supply unit. The upper end of the hot water pipe has an outlet that extends through the outer casing, and the outlet is connected to an external heat energy supply unit. The isolation cylinder is vertically designed inside the inner box, and its lower end is fixedly connected to the bottom surface of the inner box. The isolation cylinder is coaxial with the inner box and has multiple air vents evenly distributed on its surface. The material guiding component is located at the upper end of the isolation cylinder and can guide the coal slag to the position between the isolation cylinder and the inner side wall of the inner box. An air inlet is provided at the center of the bottom surface of the inner box and the outer box, and the air inlet is connected to an external air supply unit. A discharge port is provided on the bottom surface of the inner box and the outer box, corresponding to the position between the inner box and the isolation cylinder, and the discharge port is connected to an external collection unit. A feed inlet is provided at the center of the top surface of the inner box and the outer box, and an exhaust port is provided on the top surface of the inner box and the outer box, avoiding the feed inlet, and the exhaust port is connected to an external flue gas heat recovery unit.

[0007] Preferably, the material guiding assembly includes a fixed plate, a material guiding trough, and a flow guide plate. The fixed plate is fixedly disposed on the upper end of the isolation cylinder, the material guiding trough is fixedly disposed on the fixed plate with its opening facing upwards and directly opposite the feed inlet, the flow guide plate is disposed around the outer wall of the material guiding trough, and the lower end of the flow guide plate is inclined downwards. Multiple fixing rods are evenly disposed on the edge of the fixed plate, and the fixing rods are fixedly connected to the inner side wall of the inner box.

[0008] Preferably, the outer wall of the inner box is provided with multiple fins spiraling around it.

[0009] Preferably, the outer wall of the outer casing is provided with a heat insulation layer.

[0010] Preferably, the feed inlet is provided with an end cap that can be opened or closed.

[0011] This utility model provides a boiler slag waste heat recovery device, which has the following beneficial effects:

[0012] 1. This utility model has an isolation cylinder set in the center of the inner box. The coal slag is guided to the position between the inner box side wall and the isolation cylinder by the material guiding component. Air is introduced from the inside of the isolation cylinder, which can make the coal slag burn completely, release energy, and improve energy utilization. At the same time, the isolation cylinder brings the coal slag closer to the water pipe, improving the heat conduction rate.

[0013] 2. The material guiding assembly of this utility model includes a material guiding trough and a guide plate. The material guiding trough is set on the isolation cylinder by a fixing plate. The material guiding trough can accumulate some coal slag. The coal slag at the feed inlet falls onto some coal slag in the material guiding trough, forming a material-to-material grinding phenomenon, thereby reducing the wear on the material guiding trough and improving its service life. The guide plate is set around the outer wall of the material guiding trough and is inclined downward, which can guide the coal slag to be evenly piled up between the isolation cylinder and the inner box. Attached Figure Description

[0014] Figure 1 This is a front cross-sectional view of a boiler slag waste heat recovery device according to the present invention.

[0015] In the diagram: 1. Air inlet; 2. Water inlet; 3. Insulation layer; 4. Hot water pipe; 5. Inner box; 6. Fixing rod; 7. Material guide trough; 8. Guide plate; 9. Exhaust port; 10. Feed inlet; 11. Water outlet; 12. Fixing plate; 13. Vent hole; 14. Isolation cylinder; 15. Fin plate; 16. Outer box; 17. Cavity; 18. Discharge port. Detailed Implementation

[0016] 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.

[0017] like Figure 1As shown, a boiler slag waste heat recovery device includes an outer casing 16, an inner casing 5, an isolation cylinder 14, a hot water pipe 4, and a material guiding assembly. Both the inner casing 5 and the outer casing 16 are cylindrical shells, with the inner casing 5 located inside the outer casing 16. The inner casing 5 and the outer casing 16 are coaxial and their upper and lower ends are fixedly connected. A cavity 17 is formed between the outer wall of the inner casing 5 and the inner wall of the outer casing 16. A heat-conducting medium is disposed within the cavity 17. The hot water pipe 4 is disposed within the cavity 17 and coiled and fixed to the outer wall of the inner casing 5. An inlet is provided at the lower end of the hot water pipe 4. Water inlet 2 extends through the outer casing 16 and is connected to an external water supply unit. A water outlet 11 is located at the upper end of the hot water pipe 4 and extends through the outer casing 16. The outlet 11 is connected to an external heat energy supply unit. The isolation cylinder 14 is vertically designed inside the inner casing 5, and its lower end is fixedly connected to the bottom surface of the inner casing 5. The isolation cylinder 14 is coaxial with the inner casing 5 and has multiple evenly distributed air holes 13 on its surface. The material guiding assembly is located at the upper end of the isolation cylinder 14 and can guide the coal slag to the position between the isolation cylinder 14 and the inner wall of the inner casing 5. The inner casing 5 and the outer casing... An air inlet 1 is located at the center of the bottom surface of the inner box 5 and the outer box 16, and the air inlet 1 is connected to an external air supply unit. A discharge port 18 is located on the bottom surface of the inner box 5 and the outer box 16, corresponding to the position between the inner box 5 and the isolation cylinder 14, and the discharge port 18 is connected to an external collection unit. A feed inlet 10 is located at the center of the top surface of the inner box 5 and the outer box 16, and an exhaust port 9 is located on the top surface of the inner box 5 and the outer box 16, away from the feed inlet 10, and the exhaust port 9 is connected to an external flue gas heat recovery unit. The material guiding assembly includes a fixing plate 12, a material guiding trough 7, and a flow guide. Plate 8, the fixed plate 12 is fixedly installed on the upper end of the isolation cylinder 14, the guide trough 7 is fixedly installed on the fixed plate 12 with the trough opening facing upward and directly opposite the feed inlet 10, the guide plate 8 is installed around the outer wall of the guide trough 7 with the lower end of the guide plate 8 inclined downward, multiple fixed rods 6 are evenly arranged on the edge of the fixed plate 12, and the fixed rods 6 are fixedly connected to the inner side wall of the inner box 5; multiple fin plates 15 are spirally arranged on the outer side wall of the inner box 5; the outer side wall of the outer box 16 is provided with a heat insulation layer 3; the feed inlet 10 is provided with an end cover that can be opened or closed.

[0018] Its detailed connection methods are well-known technologies in this field. The following mainly introduces the working principle and process, as follows:

[0019] In this utility model, valves are installed on the water inlet 2, water outlet 11, air inlet 1, air outlet 9, and discharge outlet 18. The outer casing 16 is supported by support legs, which is common knowledge to those skilled in the art. The external water supply unit, external heat energy utilization unit, external air supply unit connection, and external collection unit can all adopt existing technologies.

[0020] According to the instruction manual Figure 1As can be seen, during operation, the coal slag discharged from the boiler is fed inward through the feed inlet 10. Since an isolation cylinder 14 is located at the center of the inner casing 5, and a material guiding component is installed at the upper end of the isolation cylinder 14, the falling coal slag lands between the isolation cylinder 14 and the inner wall of the inner casing 5. A cavity 17 is formed between the inner casing 5 and the outer casing 16. A heat-conducting medium, such as molten salt, is provided in the cavity 17. For the injection and discharge of the heat-conducting medium, an inlet and outlet are provided in the outer casing 16, as those skilled in the art will understand. The hot water pipe 4 inside the cavity 17 is coiled on the outer wall of the inner casing 5. The heat from the coal slag is transferred to the water pipe through the inner casing 5, or through the inner casing 5 and the heat-conducting medium. An external water supply unit supplies water. Room temperature water enters the hot water pipe 4 through the inlet 2, absorbs heat, and its temperature rises. The heated water flows out from the outlet 11 to the external heat energy use unit, for example, for heating. In this invention, the center of the inner box 5 is isolated by the isolation cylinder 14, and there is no coal slag. The slag is concentrated near the inner wall of the inner box 5 and close to the hot water pipe 4, which improves the efficiency of heat conduction. The coal slag accumulation between the isolation cylinder 14 and the inner box 5 is less and thinner. Air is introduced from the external air supply unit through the air inlet 1, and the air is blown towards the coal slag through the vent hole 13 of the isolation cylinder 14 and discharged from the exhaust port 9, providing sufficient oxygen for the incompletely burned coal slag, so that the coal slag is fully burned and the energy is released as much as possible, thereby improving the energy utilization rate.

[0021] The material guiding assembly includes a fixed plate 12, a material guiding trough 7, and a guide plate 8. The fixed plate 12 is fixedly installed on the upper end of the isolation cylinder 14. The material guiding trough 7 is fixedly installed on the fixed plate 12 with its opening facing upwards and directly opposite the feed inlet 10. The material guiding trough 7 can accumulate some coal slag. Coal slag falling from the feed inlet 10 onto some coal slag in the material guiding trough 7 forms a material-to-material grinding phenomenon, thereby reducing wear on the material guiding trough 7 and improving its service life. The guide plate 8 is installed around the outer wall of the material guiding trough 7, and the lower end of the guide plate 8 is inclined downwards, which can guide the coal slag to be evenly piled up between the isolation cylinder 14 and the inner box 5. Multiple fixing rods 6 are evenly arranged on the edge of the fixed plate 12. The fixing rods 6 are fixedly connected to the inner side wall of the inner box 5, increasing the stability of the material guiding assembly and the isolation cylinder 14.

[0022] The inner casing 5 has multiple fins 15 spirally arranged on its outer side wall to increase the contact area with the heat-conducting medium and improve the efficiency of heat transfer.

[0023] The outer wall of the outer casing 16 is provided with an insulation layer 3 to reduce heat loss, and the feed inlet 10 is provided with an end cover that can be opened or closed, also to reduce heat loss.

[0024] In this invention, the vent holes 13 on the isolation cylinder 14 are made as small as possible to reduce the possibility of coal ash entering the isolation cylinder 14. Of course, ash discharge ports can also be opened at the bottom of the inner box 5 and the outer box 16 corresponding to the isolation cylinder 14. Although they are not shown in the accompanying drawings, those skilled in the art can understand and conceive of this.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A boiler coal ash waste heat recovery device, characterized by, The system includes an outer casing (16), an inner casing (5), an isolation cylinder (14), a hot water pipe (4), and a material guiding assembly. Both the inner casing (5) and the outer casing (16) are cylindrical shells, with the inner casing (5) located inside the outer casing (16). The inner casing (5) and the outer casing (16) are coaxial and their upper and lower bottoms are fixedly connected. A cavity (17) is formed between the outer side wall of the inner casing (5) and the inner side wall of the outer casing (16). A heat-conducting medium is disposed in the cavity (17). The hot water pipe (4) is installed inside the cavity (17) and coiled and fixed on the outer wall of the inner box (5). The lower end of the hot water pipe (4) is provided with an inlet (2) and extends through the outer box (16). The inlet (2) is connected to the external water supply unit. The upper end of the hot water pipe (4) is provided with an outlet (11) and extends through the outer box (16). The outlet (11) is connected to the external heat energy supply unit. The isolation cylinder (14) is vertically designed inside the inner box (5), and The lower end is fixedly connected to the bottom surface of the inner box (5). The isolation cylinder (14) is coaxial with the inner box (5) and has multiple air vents (13) evenly arranged on its surface. The material guiding assembly is located at the upper end of the isolation cylinder (14) and can guide the coal slag to the position between the isolation cylinder (14) and the inner wall of the inner box (5). An air inlet (1) is provided at the center of the bottom surface of the inner box (5) and the outer box (16). The air inlet (1) is connected to the external air supply unit. A discharge port (18) is provided on the bottom surface of the inner box (5) and the outer box (16) at a position corresponding to the inner box (5) and the isolation cylinder (14). The discharge port (18) is connected to the external collection unit. A feed inlet (10) is provided at the center of the bottom surface of the inner box (5) and the outer box (16). An exhaust port (9) is provided on the bottom surface of the inner box (5) and the outer box (16) at a position away from the feed inlet (10). The exhaust port (9) is connected to the external flue gas heat recovery unit.

2. A boiler coal ash waste heat recovery device according to claim 1, characterized in that, The material guiding assembly includes a fixed plate (12), a material guiding trough (7), and a flow guide plate (8). The fixed plate (12) is fixedly installed on the upper end of the isolation cylinder (14). The material guiding trough (7) is fixedly installed on the fixed plate (12) with its opening facing upwards and directly opposite the feed inlet (10). The flow guide plate (8) is installed around the outer wall of the material guiding trough (7), and the lower end of the flow guide plate (8) is inclined downwards. Multiple fixing rods (6) are evenly arranged on the edge of the fixed plate (12), and the fixing rods (6) are fixedly connected to the inner wall of the inner box (5).

3. A boiler coal ash waste heat recovery device according to claim 1, characterized in that, The outer wall of the inner box (5) is provided with multiple fins (15).

4. A boiler coal ash waste heat recovery device according to claim 1, characterized in that, The outer wall of the outer casing (16) is provided with a heat insulation layer (3).

5. A boiler coal ash waste heat recovery device according to claim 1, characterized in that, The feed inlet (10) is equipped with an end cap that can be opened or closed.

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