Pyrolysis gasification furnace with rotary fire grate

Abstract

A rotary grate pyrolysis gasification furnace comprises a furnace body and a plurality of furnace body supporting frames for supporting the peripheral side walls of the furnace body, a smoke outlet is formed in one side of the furnace body, a feeding port is formed in the top of the furnace body, a grate supporting disc is fixedly supported in the furnace body supporting frames below the furnace body, and a rotary grate is rotatably supported on the grate supporting disc. The upper end and the lower end of the rotary fire grate are in rotary sealing connection with the fire grate supporting disc and the lower end of the furnace body through sealing structures correspondingly, the rotary fire grate is driven by a driving device to rotate, a vertical air inlet pipe is arranged in the center in the fire grate supporting disc, and the air inlet end of the air inlet pipe extends out of the fire grate supporting disc. Compared with a traditional fixed bed gasification furnace, the pyrolysis gasification furnace has the advantages that the pyrolysis efficiency is improved by more than 20%, meanwhile, the carbon content of residues is reduced to below 5%, resource waste is reduced, and the energy utilization rate is improved.

Description

Technical Field

[0001] This utility model relates to the field of pyrolysis gasification furnace technology, specifically a rotary grate pyrolysis gasification furnace. Background Technology

[0002] Fixed-bed gasifiers are commonly used in the field of solid waste treatment. However, existing fixed-bed gasifiers have several drawbacks: First, the fixed grate results in uneven heating of the material during pyrolysis, with some materials failing to fully pyrolyze, and residues easily accumulating and clogging, affecting the pyrolysis process. Second, poor sealing performance allows gas to leak from gaps during gasification, leading to energy waste and potential safety issues. Third, low slag removal efficiency requires significant manual labor for maintenance and cleaning, resulting in high maintenance costs. These problems limit the application of fixed-bed gasifiers in large-scale solid waste treatment and necessitate innovation and improvement. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a rotary grate pyrolysis gasification furnace.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: a rotary grate pyrolysis gasification furnace, comprising a furnace body and multiple furnace body support frames supporting the four sides of the furnace body, a flue gas outlet is provided on one side of the furnace body, and a feed inlet is provided on the top, a grate support disc is fixedly supported in the furnace body support frame below the furnace body, a rotary grate is rotatably supported on the grate support disc, and the upper and lower ends of the rotary grate are respectively rotatably sealed to the grate support disc and the lower end of the furnace body through a sealing structure, the rotary grate is driven to rotate by a driving device, and a vertical air inlet pipe is provided in the center of the grate support disc, the air inlet end of the air inlet pipe extending to the outside of the grate support disc.

[0005] Furthermore, the rotary grate includes an upper disc and a lower disc arranged horizontally. An annular gap is left between the upper disc and the lower disc. The center of the lower surface of the lower disc is fixedly connected to the center of the circular grate through a support column. A toothed ring structure is provided on the outer periphery of the circular grate. The gear of the drive device meshes with the toothed ring structure. An annular gap is also left between the outer periphery of the lower disc and the side wall of the rotary grate.

[0006] Furthermore, the lower open end face of the furnace body is fixed with two inner and outer cylindrical furnace body water seal inserts. The outer periphery of the rotating grate is provided with two inner and outer annular water seal groove inner plates and water seal groove outer plates. The inner and outer water seal groove plates form an annular water groove sealing structure. The furnace body water seal inserts are located inside the water groove sealing structure, and the water groove sealing structure is filled with water. The water submerges the lower end of the outer ring furnace body water seal inserts, while the inner ring furnace body water seal inserts are located outside the water groove sealing structure.

[0007] Furthermore, the lower end of the grate support disc is the slag discharge port, and the lower end of the slag discharge port is located inside the water tank.

[0008] Furthermore, an umbrella-shaped central flow guide cap is fixed at the center of the surface of the upper disk.

[0009] Furthermore, the surface of the upper disc has multiple elongated ventilation holes arranged around the center of the upper disc.

[0010] Furthermore, the outer edge of the upper disc is provided with multiple actuating blocks arranged around the center of the upper disc.

[0011] Furthermore, the rotating grate is rotatably supported on the grate support disc via a rotating support bearing.

[0012] Furthermore, an observation port is also provided on one side of the furnace body.

[0013] Furthermore, the furnace body has a double-layer structure, and the double-layer structure is filled with furnace refractory material.

[0014] With the above settings, this utility model has the following beneficial effects:

[0015] 1. Compared with the traditional fixed-bed gasifier, the pyrolysis gasifier of this utility model has a pyrolysis efficiency that is more than 20% higher. This means that more solid waste can be processed in the same amount of time, which improves production efficiency. At the same time, the carbon content of the residue is reduced to below 5%, which reduces resource waste and improves energy utilization.

[0016] 2. In terms of sealing performance, the gas leakage rate is <0.1%, which effectively avoids energy loss and safety hazards caused by gas leakage, and ensures the safety and stability of the production process.

[0017] 3. This utility model realizes continuous production, can adapt to large-scale solid waste treatment scenarios, meet the growing demand for solid waste treatment, and has significant economic and social benefits. Attached Figure Description

[0018] The present invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0021] Figure 3 This is a three-dimensional structural diagram of the rotating grate of this utility model;

[0022] Figure 4 This is a three-dimensional structural diagram of the grate support disc of this utility model. Detailed Implementation

[0023] like Figure 1-4 As shown, a rotary grate pyrolysis gasification furnace includes a furnace body 1 and multiple furnace body support frames 2 supporting the four sides of the furnace body 1. A flue gas outlet 4 is provided on one side of the furnace body 1, and a feed inlet 3 is provided at the top. A grate support disc 5 is fixedly supported within the furnace body support frames 2 below the furnace body 1. A rotary grate 6 is rotatably supported on the grate support disc 5, and the upper and lower ends of the rotary grate 6 are rotatably and sealingly connected to the grate support disc 5 and the lower end of the furnace body 1 respectively through sealing structures. The rotary grate 6... Driven by the drive device 7, the grate support disc 5 is equipped with a vertical air inlet pipe 8 at its center. The air inlet end of the air inlet pipe 8 extends to the outside of the grate support disc 5. The lower end of the grate support disc 5 is the slag discharge port 13, which is located in the water tank 14. The rotating grate 6 is rotated and supported on the grate support disc 5 by the rotating support bearing 15. An observation port 16 is also provided on one side of the furnace body 1. The furnace body 1 has a double-layer structure, and the double-layer structure is filled with furnace refractory material 17.

[0024] The rotating grate 6 includes an upper disc 601 and a lower disc 602 arranged horizontally. An annular gap is left between the upper disc 601 and the lower disc 602. The center of the lower surface of the lower disc 602 is fixedly connected to the center of the circular grate 603 through a support column 604. A gear ring structure 605 is provided on the periphery of the circular grate 603. The gear of the drive device 7 meshes with the gear ring structure 605. An annular gap is also left between the periphery of the lower disc 602 and the side wall of the rotating grate 6. An umbrella-shaped central guide cap 606 is fixed on the center of the surface of the upper disc 601. Multiple elongated ventilation holes 607 are arranged around the center of the upper disc 601 on the surface of the upper disc 601. Multiple actuating blocks 608 are arranged around the center of the upper disc 601 on the outer edge of the upper disc 601.

[0025] The specific sealing structure is as follows: the lower end opening face of the furnace body 1 is fixed with two inner and outer cylindrical furnace body water seal insert plates 12. The outer periphery of the rotating grate 6 is provided with two inner and outer annular water seal groove inner plates 9 and water seal groove outer plates 10. The inner plates 9 and outer plates 10 form an annular water groove sealing structure 11. The outer ring furnace body water seal insert plates 12 are located inside the water groove sealing structure 11, and the water groove sealing structure 11 is filled with water, which covers the lower end of the outer ring furnace body water seal insert plates 12. The inner ring furnace body water seal insert plates 12 are located outside the water groove sealing structure 11. This forms a multi-layer water seal. The multi-layer water seal structure increases the resistance to gas leakage and forms a tight barrier, effectively isolating gas leakage inside the furnace. Moreover, this sealing method does not require frequent maintenance, reduces the maintenance frequency, and ensures the safety and stability of the pyrolysis gasification process.

[0026] The working principle of this utility model is as follows: Material enters the furnace body 1 through the feed inlet 3. The design of the feed inlet 3 ensures that the material can smoothly enter the furnace body without clogging. After the material is added, air is introduced through the bottom air inlet pipe 8, and the material is ignited by a burner. Simultaneously, the rotating grate 6 is driven to rotate by the drive device 7. The gear of the drive device 7 (reduction motor) meshes with the gear ring structure 605, thereby driving the entire rotating grate 6 to rotate. The material is evenly distributed to the surrounding area by the agitator block 608. This design allows the material entering the furnace body to rotate smoothly on the rotating grate. The material is evenly distributed throughout the process, avoiding localized material accumulation and promoting uniform pyrolysis. Simultaneously, the continuously rotating grate effectively prevents residue blockage, ensuring smooth pyrolysis. During pyrolysis, the material gradually transforms into combustible gas and residue under high temperature and the action of the gasifying agent. The generated combustible gas is collected through the flue gas outlet for subsequent energy utilization. The residue falls into the slag discharge port 13 as the grate rotates and is automatically discharged into the bottom water tank. The water tank serves to cool and pre-treat the residue, preventing excessively high residue temperatures from causing safety issues, and also facilitating further processing of the residue.

[0027] A vertical air inlet pipe 8 is set in the center of the grate support disc 5. The air inlet end of the air inlet pipe 8 extends to the outside of the grate support disc 5. The grate support disc 5 and the bottom air inlet pipe 8 are cleverly combined to optimize the distribution of the gasifying agent. After the gasifying agent enters from the bottom air inlet pipe 8, it is evenly distributed to all parts of the material through the grate support disc 5, so that the material and the gasifying agent can fully contact each other, which greatly improves the pyrolysis efficiency.

[0028] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A rotary grate pyrolysis gasification furnace, comprising a furnace body (1) and multiple furnace body support frames (2) supporting the four sides of the furnace body (1), wherein a flue gas outlet (4) is provided on one side of the furnace body (1) and a feed inlet (3) is provided on the top, characterized in that: A grate support disc (5) is fixedly supported in the furnace support frame (2) below the furnace body (1). A rotating grate (6) is rotatably supported on the grate support disc (5). The upper and lower ends of the rotating grate (6) are rotatably sealed to the grate support disc (5) and the lower end of the furnace body (1) through a sealing structure. The rotating grate (6) is driven to rotate by a drive device (7). A vertical air inlet pipe (8) is provided in the center of the grate support disc (5). The air inlet end of the air inlet pipe (8) extends to the outside of the grate support disc (5).

2. A rotating grate pyrolysis gasifier as claimed in claim 1, wherein: The rotating grate (6) includes an upper disc (601) and a lower disc (602) arranged horizontally. There is an annular gap between the upper disc (601) and the lower disc (602). The center of the lower surface of the lower disc (602) is fixedly connected to the center of the circular grate (603) through a support column (604). A gear ring structure (605) is provided on the outer periphery of the circular grate (603). The gear of the drive device (7) meshes with the gear ring structure (605). There is also an annular gap between the outer periphery of the lower disc (602) and the side wall of the rotating grate (6).

3. A rotating grate pyrolysis gasification furnace as claimed in claim 1, characterized in that: The lower end opening face of the furnace body (1) is fixed with two inner and outer cylindrical furnace body water seal inserts (12). The outer periphery of the rotating grate (6) is provided with two inner and outer ring annular water seal groove inner plates (9) and water seal groove outer plates (10). The water seal groove inner plates (9) and water seal groove outer plates (10) form an annular water trough sealing structure (11). The outer ring furnace body water seal inserts (12) are located inside the water trough sealing structure (11), and the water trough sealing structure (11) is filled with water. The water submerges the lower end of the outer ring furnace body water seal inserts (12). The inner ring furnace body water seal inserts (12) are located outside the water trough sealing structure (11).

4. A rotating grate pyrolysis gasifier as claimed in claim 1, wherein: The lower end of the grate support disc (5) is the slag discharge port (13), and the lower end of the slag discharge port (13) is located inside the water tank (14).

5. A rotating grate pyrolysis gasification furnace as claimed in claim 2, characterized in that: An umbrella-shaped central flow guide cap (606) is fixed at the center of the surface of the upper disk (601).

6. A rotating grate pyrolysis gasification furnace as claimed in claim 2, characterized in that: The surface of the upper disk (601) has multiple long strip-shaped ventilation holes (607) arranged around the center of the upper disk (601).

7. A rotating grate pyrolysis gasification furnace as claimed in claim 2, characterized in that: The outer edge of the upper disk (601) is provided with multiple actuating blocks (608) arranged around the center of the upper disk (601).

8. A rotating grate pyrolysis gasification furnace as claimed in claim 1, characterized in that: The rotating grate (6) is rotated and supported on the grate support disc (5) by the rotating support bearing (15).

9. A rotating grate pyrolysis gasification furnace as claimed in claim 1, characterized in that: An observation port (16) is also provided on one side of the furnace body (1).

10. A rotating grate pyrolysis gasification furnace as claimed in claim 1, characterized in that: The furnace body (1) has a double-layer structure, and the double-layer structure is filled with furnace refractory material (17).

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