Ash pit structure with ash residue waste heat recovery function

Abstract

The utility model belongs to the technical field of waste heat recovery, and particularly relates to an ash pit structure with ash residue waste heat recovery, which comprises a pit body and a waste heat recovery pipeline arranged at the upper end of the pit body, the waste heat recovery pipeline is arranged at a residue inlet of the pit body and is vertically arranged, and a heat exchange plate which is inclined downwards is arranged on the inner wall of the waste heat recovery pipeline. A space for ash to pass through is reserved between the lower end of the heat exchange plate and the inner wall of the waste heat recovery pipeline, a heat exchange pipe is arranged in the heat exchange plate, a heat exchange medium flows in the heat exchange pipe, and the two ends of the heat exchange pipe penetrate out of the waste heat recovery pipeline. The waste heat recovery pipeline is arranged above the pit body, high-temperature ash firstly enters the waste heat recovery pipeline and is in contact with the heat exchange plate, heat of the ash is transmitted to the heat exchange medium through the heat exchange plate and the heat exchange pipe, the heat is taken away by the heat exchange medium to be recycled, and the problem of ash heat waste is solved.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat recovery technology, specifically a ash pit structure with ash slag waste heat recovery. Background Technology

[0002] A grate is a component in a boiler or industrial furnace that holds and effectively combusts solid fuel. The grate mainly consists of two parts: a frame and grate bars. The grate bars are typically made of cast iron. After assembly, necessary ventilation gaps are maintained between the bars, and often, adjustable ventilation chambers are installed under the grate to allow air to enter the fuel bed for combustion. Grate types include fixed, movable, reciprocating, vibrating, and underfeed types.

[0003] After combustion, the ash and slag in the grate are removed manually or mechanically. Typically, an ash pit is installed below the grate, filled with water and equipped with a slag remover. The hot ash and slag fall into the ash pit after being discharged from the grate, where they are first cooled by water before being discharged by the slag remover. However, directly cooling the ash and slag with water while it is still at a high temperature wastes heat. Utility Model Content

[0004] To address the problems mentioned above, this utility model provides an ash pit structure with ash waste heat recovery. A waste heat recovery pipe is installed above the pit body. The high-temperature ash first enters the waste heat recovery pipe and contacts the heat exchange plate. The heat of the ash is transferred to the heat exchange medium through the heat exchange plate and heat exchange pipe. The heat exchange medium carries away the heat for recycling, thus improving the problem of ash heat waste.

[0005] This utility model provides an ash pit structure with ash waste heat recovery, including a pit body and a waste heat recovery pipe located at the upper end of the pit body. The waste heat recovery pipe is located at the ash inlet of the pit body and is vertically arranged. The inner wall of the waste heat recovery pipe is provided with a heat exchange plate that is inclined downward. A space is left between the lower end of the heat exchange plate and the inner wall of the waste heat recovery pipe for ash to pass through. The heat exchange plate is provided with a heat exchange tube, and a heat exchange medium flows in the heat exchange tube. Both ends of the heat exchange tube extend out of the waste heat recovery pipe.

[0006] Furthermore, the heat exchange tubes are arranged in an S-shaped continuous bend within the heat exchange plate.

[0007] Furthermore, multiple heat exchange plates are provided, and these heat exchange plates are arranged alternately from top to bottom inside the waste heat recovery pipeline.

[0008] Furthermore, the lower end of the heat exchange plate is provided with a storage groove with an upper opening, a baffle is movably installed in the storage groove, and a drive component for driving the baffle to move is provided on the heat exchange plate.

[0009] Furthermore, the drive assembly includes a linear actuator mounted on the bottom surface of the heat exchange plate. A fixed pulley is also provided on the bottom surface of the heat exchange plate, located below the baffle. A pull rope is fixedly connected to the telescopic end of the linear actuator, straddling the fixed pulley. The end of the pull rope away from the linear actuator passes through the storage groove and is fixedly connected to the baffle. When the telescopic end of the linear actuator retracts, the linear actuator drives the baffle to move downward through the pull rope. A reset component that drives the baffle to move upward is also provided in the storage groove.

[0010] Furthermore, the reset component is a spring, with the upper end of the spring abutting against the lower end of the baffle and the lower end of the spring abutting against the bottom of the storage groove.

[0011] Furthermore, a protective shell is provided on the bottom surface of the heat exchange plate. The protective shell covers the linear actuator and the fixed pulley. The protective shell is detachably installed on the heat exchange plate by screws.

[0012] Furthermore, the inner wall of the waste heat recovery pipeline is equipped with multiple high-pressure air nozzles, which are located above the heat exchange plate and face the top surface of the heat exchange plate.

[0013] Furthermore, a fixing plate is fixedly connected to the inner wall of the waste heat recovery pipeline. The fixing plate is located above the high-pressure gas nozzle. A downwardly inclined cover plate is rotatably connected to the fixing plate, and the lower end of the cover plate rests on the heat exchange plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] (1) After the ash is discharged from the grate, it enters the waste heat recovery pipe and comes into contact with the heat exchange plate. The heat of the ash is transferred to the heat exchange medium through the heat exchange plate and heat exchange pipe. The heat exchange medium takes away the heat for recycling, which improves the problem of heat waste of ash. Since the heat exchange plate is set to be inclined downward, the ash slides down under the action of gravity and falls into the pit. After cooling, it is discharged by the slag removal machine.

[0016] (2) As the ash and slag slide down, they will pass through multiple heat exchange plates and undergo multiple heat exchanges, which further improves the heat exchange efficiency.

[0017] (3) Since the heat exchange plate is inclined downward, the ash and slag stay on the heat exchange plate for a short time. Therefore, when heat exchange is required, the drive component drives the baffle to move upward, thereby blocking some of the ash and slag from staying on the heat exchange plate for heat exchange. After heat exchange for a period of time, the drive component drives the baffle to move downward and collect it in the collection groove. At this time, the ash and slag can slide downward along the heat exchange plate. The baffle can block the ash and slag from staying on the heat exchange plate, prolonging the heat exchange time and improving the heat exchange efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the internal structure of an ash pit structure with ash waste heat recovery.

[0020] Figure 2 This is a cross-sectional view of the heat exchange plate and drive assembly;

[0021] Figure 3 This is a schematic diagram of the heat exchange tube structure;

[0022] Explanation of reference numerals in the attached drawings: 1. Pit body; 2. Waste heat recovery pipe; 3. Heat exchange plate; 4. Heat exchange tube; 5. Collection trough; 6. Baffle; 7. Drive assembly; 70. Linear actuator; 71. Fixed pulley; 72. Pull rope; 73. Reset component; 730. Spring; 8. Protective housing; 9. High-pressure air nozzle; 10. Fixing plate; 11. Cover plate. Detailed Implementation

[0023] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] The following is in conjunction with the appendix Figure 1 To be continued Figure 3 The present invention will be described in detail with specific embodiments.

[0025] Reference Figures 1-3 The present invention provides an ash pit structure with ash waste heat recovery, including a pit body 1 and a waste heat recovery pipe 2 located at the upper end of the pit body 1. The waste heat recovery pipe 2 is located at the ash inlet of the pit body 1 and is vertically arranged. The inner wall of the waste heat recovery pipe 2 is provided with a heat exchange plate 3 that is inclined downward. A space for ash waste to pass through is left between the lower end of the heat exchange plate 3 and the inner wall of the waste heat recovery pipe 2. The heat exchange plate 3 is provided with a heat exchange tube 4 inside, and a heat exchange medium flows in the heat exchange tube 4. Both ends of the heat exchange tube 4 extend out of the waste heat recovery pipe 2.

[0026] It should be noted that the pit body 1 is filled with cooling water and equipped with a slag remover, both of which are existing technologies and will not be described in detail or shown in the attached drawings. After the ash is discharged from the grate, it enters the waste heat recovery pipe 2 and comes into contact with the heat exchange plate 3. The heat of the ash is transferred to the heat exchange medium through the heat exchange plate 3 and the heat exchange pipe 4. The heat exchange medium carries away the heat for recovery and utilization, which improves the problem of heat waste in the ash. Since the heat exchange plate 3 is inclined downward, the ash slides downward under the action of gravity and falls into the pit body 1. After cooling, it is discharged by the slag remover.

[0027] As a preferred embodiment, the heat exchange tube 4 is arranged in an S-shaped continuous bend within the heat exchange plate 3. This arrangement of the heat exchange tube 4 can increase the contact area with the heat exchange plate 3, thereby improving the heat exchange efficiency and better recovering the heat of the ash slag.

[0028] In a preferred embodiment, multiple heat exchange plates 3 are provided, arranged alternately from top to bottom within the waste heat recovery pipe 2. Specifically, adjacent heat exchange plates 3 are arranged opposite each other. For example, if the first heat exchange plate 3 is fixed on the left inner wall of the waste heat recovery pipe 2, the next adjacent heat exchange plate 3 is fixed on the right inner wall of the waste heat recovery pipe 2, and the next heat exchange plate 3 is fixed on the left inner wall of the waste heat recovery pipe 2, and so on. Therefore, as the ash and slag slide down, they will pass through multiple heat exchange plates 3, undergoing multiple heat exchanges, further improving the heat exchange efficiency.

[0029] In a preferred embodiment, the lower end of the heat exchange plate 3 has a receiving groove 5 with an upper opening. A baffle 6 is movably disposed within the receiving groove 5, and a driving assembly 7 is provided on the heat exchange plate 3 to drive the baffle 6 to move. Since the heat exchange plate 3 is inclined downwards, the ash and slag stay on the heat exchange plate 3 for a shorter period of time. Therefore, when heat exchange is required, the driving assembly 7 drives the baffle 6 to move upwards, thereby preventing some ash and slag from staying on the heat exchange plate 3 for heat exchange. After heat exchange for a period of time, the driving assembly 7 drives the baffle 6 to move downwards and be stored in the receiving groove 5. At this time, the ash and slag can slide downwards along the heat exchange plate 3, and the baffle 6 can prevent the ash and slag from staying on the heat exchange plate 3, thus extending the heat exchange time and improving the heat exchange efficiency.

[0030] In a preferred embodiment, the drive assembly 7 includes a linear actuator 70, which is mounted on the bottom surface of the heat exchange plate 3. A fixed pulley 71 is also provided on the bottom surface of the heat exchange plate 3. The fixed pulley 71 is located below the baffle 6. A pull rope 72 is fixedly connected to the telescopic end of the linear actuator 70. The pull rope 72 is straddled on the fixed pulley 71. The end of the pull rope 72 away from the linear actuator 70 passes into the storage groove 5 and is fixedly connected to the baffle 6. When the telescopic end of the linear actuator 70 is retracted, the linear actuator 70 drives the baffle 6 to move downward through the pull rope 72. A reset member 73 that drives the baffle 6 to move upward is also provided in the storage groove 5.

[0031] Specifically, the linear actuator 70 can be a cylinder or an electric push rod. This utility model does not specifically limit the type of the linear actuator 70. When the telescopic end of the linear actuator 70 is retracted, the linear actuator 70 pulls the pull rope 72, and the pull rope 72 pulls the baffle 6 downward. The baffle 6 is stored in the storage groove 5, thereby realizing the downward movement of the baffle 6. When the telescopic end of the linear actuator 70 is extended, the reset member 73 drives the baffle 6 to move upward. Since the stroke of the linear actuator 70 can be controlled, and the baffle 6 is connected to the linear actuator 70 through the pull rope 72, the stroke of the baffle 6 can be controlled by the linear actuator 70 to prevent the baffle 6 from moving upward excessively and dislodging from the storage groove 5.

[0032] In a preferred embodiment, the reset member 73 is a spring 730, the upper end of the spring 730 abuts against the lower end of the baffle 6, and the lower end of the spring 730 abuts against the bottom of the receiving groove 5.

[0033] In a preferred embodiment, a protective housing 8 is provided on the bottom surface of the heat exchange plate 3. The protective housing 8 covers the linear actuator 70 and the fixed pulley 71, and is detachably installed on the heat exchange plate 3 by screws. The protective housing 8 can protect the linear actuator 70 and the fixed pulley 71, extend their service life, and is detachable, facilitating later maintenance of the linear actuator 70 and the fixed pulley 71.

[0034] In a preferred embodiment, the inner wall of the waste heat recovery pipe 2 is equipped with multiple high-pressure air nozzles 9, which are located above the heat exchange plate 3 and face the top surface of the heat exchange plate 3. Over time, some ash and slag will remain on the top surface of the heat exchange plate 3, affecting heat exchange efficiency. The high-pressure air nozzles 9 can periodically blow air to clean the ash and slag remaining on the heat exchange plate 3, thereby reducing the impact on heat exchange efficiency. Of course, the high-pressure air nozzles 9 are supplied with high-pressure gas by an air compressor, which is existing technology.

[0035] In a preferred embodiment, a fixing plate 10 is fixedly connected to the inner wall of the waste heat recovery pipe 2. The fixing plate 10 is located above the high-pressure air nozzle 9. A downwardly inclined cover plate 11 is rotatably connected to the fixing plate 10, and the lower end of the cover plate 11 rests on the heat exchange plate 3. The fixing plate 10 and the cover plate 11 provide a space for the high-pressure air nozzle 9, thereby preventing ash and slag from clogging the high-pressure air nozzle 9. When the high-pressure air nozzle 9 blows air, the cover plate 11 is first blown up, causing the cover plate 11 to rotate and detach from the heat exchange plate 3, and then the heat exchange plate 3 is cleaned by blowing air.

[0036] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. An ash pit structure with ash waste heat recovery, characterized in that, The device includes a pit body and a waste heat recovery pipe located at the upper end of the pit body. The waste heat recovery pipe is located at the slag inlet of the pit body and is vertically arranged. The inner wall of the waste heat recovery pipe is provided with a heat exchange plate that is inclined downward. A space is left between the lower end of the heat exchange plate and the inner wall of the waste heat recovery pipe for ash and slag to pass through. The heat exchange plate is provided with a heat exchange tube, and a heat exchange medium flows in the heat exchange tube. Both ends of the heat exchange tube extend out of the waste heat recovery pipe.

2. The ash pit structure with ash waste heat recovery according to claim 1, characterized in that, The heat exchange tubes are arranged in an S-shaped continuous bend within the heat exchange plate.

3. The ash pit structure with ash waste heat recovery according to claim 1, characterized in that, Multiple heat exchange plates are provided, and the multiple heat exchange plates are arranged alternately from top to bottom in the waste heat recovery pipe.

4. The ash pit structure with ash waste heat recovery according to claim 1, characterized in that, The heat exchange plate has a storage groove with an opening at the top at the lower end, and a baffle is movably arranged in the storage groove. The heat exchange plate is provided with a driving component for moving the baffle.

5. The ash pit structure with ash waste heat recovery according to claim 4, characterized in that, The driving assembly includes a linear actuator mounted on the bottom surface of the heat exchange plate. A fixed pulley is also provided on the bottom surface of the heat exchange plate, located below the baffle. A pull rope is fixedly connected to the telescopic end of the linear actuator, straddling the fixed pulley. The end of the pull rope away from the linear actuator passes through the receiving groove and is fixedly connected to the baffle. When the telescopic end of the linear actuator retracts, the linear actuator drives the baffle to move downward through the pull rope. A reset component that drives the baffle to move upward is also provided in the receiving groove.

6. The ash pit structure with ash waste heat recovery according to claim 5, characterized in that, The reset component is a spring, with the upper end of the spring abutting against the lower end of the baffle and the lower end of the spring abutting against the bottom of the storage groove.

7. The ash pit structure with ash waste heat recovery according to claim 5, characterized in that, A protective housing is provided on the bottom surface of the heat exchange plate. The protective housing covers the linear drive and the fixed pulley. The protective housing is detachably installed on the heat exchange plate by screws.

8. The ash pit structure with ash waste heat recovery according to claim 1, characterized in that, The waste heat recovery pipe has multiple high-pressure nozzles on its inner wall. The high-pressure nozzles are located above the heat exchange plate and face the top surface of the heat exchange plate.

9. The ash pit structure with ash waste heat recovery according to claim 8, characterized in that, A fixing plate is fixedly connected to the inner wall of the waste heat recovery pipe. The fixing plate is located above the high-pressure air nozzle. A downwardly inclined cover plate is rotatably connected to the fixing plate. The lower end of the cover plate rests on the heat exchange plate.

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