Household garbage pyrolysis flue gas circulating equipment and garbage treatment system

Abstract

The utility model relates to household garbage pyrolysis flue gas circulating equipment and a garbage treatment system. The household garbage pyrolysis flue gas circulation equipment comprises a pyrolysis gasification furnace and a circulation pipeline assembly, the pyrolysis gasification furnace comprises a drying cavity, a pyrolysis cavity and a combustion cavity which are sequentially arranged from top to bottom, the drying cavity is provided with a feeding port, a first heat conduction plate is arranged between the drying cavity and the pyrolysis cavity, and a second heat conduction plate is arranged between the pyrolysis cavity and the combustion cavity; the first heat-conducting plate and the second heat-conducting plate can communicate or separate the two adjacent cavities through actions of the first heat-conducting plate and the second heat-conducting plate; the circulating pipeline assembly is arranged on the pyrolysis gasification furnace and communicates with the pyrolysis cavity and the combustion cavity, so that pyrolysis mixed gas in the pyrolysis cavity flows to the combustion cavity. According to the household garbage pyrolysis flue gas circulation equipment, the three procedures of drying, thermal decomposition and oxygen-enriched combustion can be sequentially conducted on garbage, harmful gas generated after pyrolysis of the household garbage is further combusted, the harmless treatment capacity of the household garbage is improved, and environmental pollution is reduced.

Description

Technical Field

[0001] This application relates to the field of waste treatment technology, and in particular to a waste pyrolysis flue gas recirculation device and waste treatment system. Background Technology

[0002] With the rapid development of urban and rural economies and the improvement of people's living standards, the amount of rural domestic waste generated is increasing at a rate of about 8% per year. In 2021, my country's rural domestic waste production reached 160 million tons. However, my country's rural domestic waste collection and transportation system is still incomplete, and the rate of harmless terminal disposal of domestic waste is less than 60%. Especially in economically underdeveloped remote areas, the main methods used are simple on-site incineration and simple landfill, which are difficult to meet environmental protection requirements and pose high environmental risks.

[0003] On the other hand, the state has imposed stricter requirements on the harmless treatment of rural domestic waste, and has set higher standards for the technology level of harmless terminal treatment of rural domestic waste. In recent years, relevant domestic research institutions and enterprises have carried out relevant technological research and application on the above-mentioned problems of terminal treatment of rural domestic waste, but there are still problems such as low thermal efficiency and exhaust emission values ​​approaching the emission limit. Utility Model Content

[0004] In view of the above problems, this application provides a pyrolysis flue gas recirculation device and a waste treatment system for municipal solid waste, aiming to improve the harmless treatment capacity of municipal solid waste and reduce environmental pollution.

[0005] In a first aspect, this application proposes a pyrolysis flue gas circulation device for municipal solid waste, including a pyrolysis gasification furnace and a circulation pipeline assembly. The pyrolysis gasification furnace includes a drying chamber, a pyrolysis chamber, and a combustion chamber arranged sequentially from top to bottom. The drying chamber is provided with a feed inlet. A first heat-conducting plate is provided between the drying chamber and the pyrolysis chamber, and a second heat-conducting plate is provided between the pyrolysis chamber and the combustion chamber. Both the first and second heat-conducting plates can connect or separate adjacent chambers through their own movement. The circulation pipeline assembly is provided in the pyrolysis gasification furnace and connects the pyrolysis chamber and the combustion chamber so that the pyrolysis mixed gas in the pyrolysis chamber can flow to the combustion chamber.

[0006] In some embodiments, the circulation piping assembly includes multiple air inlets and multiple exhaust outlets, with the multiple air inlets respectively connected to the pyrolysis chamber and the multiple exhaust outlets respectively connected to the combustion chamber.

[0007] In some embodiments, at least a portion of the plurality of air inlets is arranged around the sidewall of the pyrolysis chamber.

[0008] In some embodiments, at least a portion of the plurality of air inlets is located at the top of the pyrolysis chamber.

[0009] In some embodiments, the municipal solid waste pyrolysis flue gas recirculation equipment also includes an air distribution duct assembly connected to the pyrolysis gasifier and partially located within the combustion chamber. The air distribution duct assembly is used to inject oxygen-containing gas into the combustion chamber and is connected to the exhaust port.

[0010] In some embodiments, the air distribution duct assembly includes a vertical air distribution duct and a horizontal air distribution duct. The vertical air distribution duct has multiple air distribution ports along the height direction of the pyrolysis gasification furnace. The horizontal air distribution duct is located at the bottom of the vertical air distribution duct and has multiple air distribution ports along the height direction perpendicular to the pyrolysis gasification furnace. The horizontal air distribution duct is connected to the exhaust port.

[0011] In some embodiments, the air distribution duct assembly further includes a preheating chamber connected to the horizontal air distribution duct, with the exhaust port connected to the preheating chamber.

[0012] In some implementations, an induced draft fan is also provided on the air distribution duct assembly.

[0013] In some embodiments, the vertical air distribution duct extends along the height of the pyrolysis gasification furnace and extends to connect with the first heat-conducting plate and / or the second heat-conducting plate, and is used to conduct heat to the first heat-conducting plate and / or the second heat-conducting plate.

[0014] In some embodiments, the pyrolysis gasifier also includes a slag removal chamber located at the bottom of the combustion chamber, and a spiral slag removal device is installed in the slag removal chamber.

[0015] Secondly, this application also proposes a waste treatment system, which includes a waste pyrolysis flue gas recirculation device as described in any embodiment of the first aspect of this application.

[0016] According to this application, the municipal solid waste pyrolysis flue gas recirculation equipment includes a pyrolysis gasification furnace and a circulation pipeline assembly. The pyrolysis gasification furnace includes a drying chamber, a pyrolysis chamber, and a combustion chamber arranged sequentially from top to bottom. The drying chamber is provided with a feed inlet. A first heat-conducting plate is arranged between the drying chamber and the pyrolysis chamber, and a second heat-conducting plate is arranged between the pyrolysis chamber and the combustion chamber. Both the first and second heat-conducting plates can connect or separate adjacent chambers through their own movement. The circulation pipeline assembly is arranged in the pyrolysis gasification furnace and connects the pyrolysis chamber and the combustion chamber, so that the pyrolysis mixed gas in the pyrolysis chamber can flow to the combustion chamber. Thus, when municipal solid waste enters the pyrolysis gasification furnace, it can undergo three processes in sequence: drying, pyrolysis, and oxygen-enriched combustion, enhancing the harmless treatment capacity of municipal solid waste. Furthermore, the harmful gases generated after the pyrolysis of municipal solid waste can also enter the combustion chamber through the circulation pipeline assembly for further complete combustion, further reducing the emission of harmful gases. The waste pyrolysis flue gas recirculation equipment of this application can form a complete closed loop for the treatment of waste, improve the harmless treatment capacity of waste, and reduce environmental pollution. Attached Figure Description

[0017] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0018] Figure 1 A front view of a pyrolysis gasification furnace provided for some embodiments of this application;

[0019] Figure 2 A side view of a pyrolysis gasification furnace provided for some embodiments of this application.

[0020] The accompanying drawings may not be drawn to scale.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Drying chamber; 2. Pyrolysis chamber; 3. Combustion chamber; 4. Slag removal bin; 5. Guide and diversion device; 6. Trapezoidal combustion device; 7. Spiral slag removal device. Detailed Implementation

[0023] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0024] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0025] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] The following describes some embodiments of this application in further detail with reference to the accompanying drawings.

[0027] like Figure 1 and Figure 2 As shown, the municipal solid waste pyrolysis flue gas circulation equipment includes a pyrolysis gasification furnace and a circulation pipeline assembly. The pyrolysis gasification furnace includes a drying chamber 1, a pyrolysis chamber 2, and a combustion chamber 3 arranged sequentially from top to bottom. The drying chamber 1 is provided with a feed inlet. A first heat-conducting plate is provided between the drying chamber 1 and the pyrolysis chamber 2, and a second heat-conducting plate is provided between the pyrolysis chamber 2 and the combustion chamber 3. Both the first and second heat-conducting plates can connect or separate adjacent chambers through their own movement. The circulation pipeline assembly is provided in the pyrolysis gasification furnace and connects the pyrolysis chamber 2 and the combustion chamber 3 so that the pyrolysis mixed gas in the pyrolysis chamber 2 can flow to the combustion chamber 3.

[0028] In this application, the pyrolysis gasifier is a key component of the municipal solid waste pyrolysis flue gas recirculation equipment, and it can have various shapes, such as cylindrical, square, or other irregular shapes. The size of the pyrolysis gasifier can be determined according to actual needs, and this application does not impose any restrictions on it.

[0029] In this application, the drying chamber 1, pyrolysis chamber 2, and combustion chamber 3 can be considered as three relatively closed and independent chambers, in which municipal solid waste can complete the reaction sequentially. For example, when municipal solid waste enters the drying chamber 1 through the feed inlet, it is first dried in the drying chamber 1 for a certain period of time. When the preset drying time is reached or the moisture content of the waste is judged to meet the requirements, the first heat conduction plate is opened, and the waste falls into the pyrolysis chamber 2 under the action of gravity. After that, it undergoes pyrolysis for a period of time. After the pyrolysis is completed, the second heat conduction plate is opened, and the waste enters the combustion chamber 3 for combustion. The waste residue after complete combustion is discharged from the pyrolysis gasification furnace.

[0030] It is understood that both the first and second heat-conducting plates can be composed of multiple movable plates to facilitate adjustment of their shapes. For example, in some examples, the first heat-conducting plate may include plate A and plate B, both of which can be moved to a horizontal or inclined state. When both plates A and B are horizontal, the first heat-conducting plate as a whole can be considered as a single horizontal plate, which can block debris from falling. When both plates A and B are inclined, a gap can be formed between them to allow debris to fall. Of course, the first and second heat-conducting plates can also be in other forms, such as a single plate, and their opening method can be sliding or folding, etc. This application does not limit this.

[0031] It should be noted that the pyrolysis mixture gas mentioned in this application refers to a mixture of various harmful gases and water vapor produced after the pyrolysis of waste. Common harmful gases include carbon monoxide and nitrogen monoxide. The pyrolysis mixture gas can enter the combustion chamber 3 from the pyrolysis chamber 2 through the circulation pipeline assembly. After being fully combusted in the combustion chamber 3, it can be converted into harmless gases such as carbon dioxide and discharged.

[0032] In some examples, a guide diversion device 5 may be provided in the drying chamber 1 to divert the domestic waste entering the chamber, improve the uniformity of its thickness distribution, and enhance the drying effect of the waste.

[0033] In some examples, multiple trapezoidal combustion devices 6 can be installed in the combustion chamber 3, which helps to improve the complete combustion of waste and the uniformity of combustion in different areas of the chamber, reducing the discharge of untreated pollutants and thus reducing environmental pollution.

[0034] According to the municipal solid waste pyrolysis flue gas recirculation equipment of this application, after municipal solid waste enters the pyrolysis gasification furnace, it can undergo three processes in sequence: drying, thermal decomposition, and oxygen-enriched combustion. This effectively reduces the environmental pollution caused by municipal solid waste. Furthermore, the harmful gases generated after the pyrolysis of municipal solid waste can also enter the combustion chamber 3 through the circulation pipeline assembly for complete combustion, further reducing the emission of harmful gases. The municipal solid waste pyrolysis flue gas recirculation equipment of this application can form a complete closed loop for the treatment of municipal solid waste, improving the harmless treatment capacity of waste and reducing environmental pollution.

[0035] In some embodiments, the circulation pipe assembly includes a plurality of air inlets and a plurality of exhaust outlets, the plurality of air inlets being connected to the pyrolysis chamber 2 and the plurality of exhaust outlets being connected to the combustion chamber 3.

[0036] The embodiments of this application provide a circulating pipeline assembly including multiple air inlets and multiple exhaust outlets, which can enhance the conveying capacity of the pyrolysis mixture and facilitate the full discharge of the pyrolysis mixture. This not only reduces environmental pollution caused by untreated pyrolysis mixture being discharged into the air, but also helps to improve the pyrolysis reaction efficiency of waste.

[0037] In this application, the multiple air inlets of the circulating pipeline assembly can be arranged in various ways.

[0038] For example, in some examples, at least a portion of the multiple air inlets are arranged around the sidewall of the pyrolysis chamber 2. The advantage of this arrangement is that it allows the pyrolysis mixture distributed around the pyrolysis chamber 2 to be effectively and promptly discharged, thereby enhancing the transport capacity of the circulation pipeline assembly for the pyrolysis mixture.

[0039] In other examples, at least some of the multiple air inlets are located at the top of the pyrolysis chamber 2. The advantage of this arrangement is that the mixed gas that converges at the top of the pyrolysis chamber 2 can be discharged more easily, which can greatly reduce the content of the pyrolysis mixed gas in the pyrolysis chamber 2 and improve the emission efficiency of the pyrolysis mixed gas.

[0040] In some embodiments, the municipal solid waste pyrolysis flue gas recirculation equipment further includes an air distribution duct assembly, which is connected to the pyrolysis gasification furnace and partially located within the combustion chamber 3. The air distribution duct assembly is used to inject oxygen-containing gas into the combustion chamber 3 and is connected to the exhaust port.

[0041] The air distribution duct assembly is mainly used to inject oxygen-containing gas into the combustion chamber 3 to provide combustion aids for waste combustion and ensure complete combustion. It should be noted that the oxygen-containing gas mentioned in this application can generally be oxygen-containing air or oxygen-enriched air. Of course, in some examples, the oxygen-containing gas can also be pure oxygen. In this case, in order to increase the oxygen concentration, the air distribution duct assembly can also be connected to an external oxygen generator.

[0042] The air distribution duct assembly is connected to the exhaust port, which can discharge the pyrolysis mixture transmitted through the circulation duct assembly into the combustion chamber 3, thereby achieving complete combustion, reducing the direct emission of harmful gases, and facilitating the mixing of the pyrolysis mixture with oxygen-containing gases, thus improving the combustion effect of the pyrolysis mixture.

[0043] In some embodiments, the air distribution duct assembly includes a vertical air distribution duct and a horizontal air distribution duct. The vertical air distribution duct has multiple air distribution ports along the height direction of the pyrolysis gasification furnace. The horizontal air distribution duct is located at the bottom of the vertical air distribution duct and has multiple air distribution ports along the height direction perpendicular to the pyrolysis gasification furnace. The horizontal air distribution duct is connected to the exhaust port.

[0044] In this embodiment, one or more vertical air distribution ducts can be configured. When multiple vertical air distribution ducts are configured, they can be spaced apart. Similarly, one or more horizontal air distribution ducts can also be configured. When multiple horizontal air distribution ducts are configured, they can be arranged longitudinally or laterally, and this application does not impose any restrictions on this.

[0045] Both the vertical and horizontal air distribution ducts have multiple air distribution ports. The advantage of this design is that it allows oxygen-containing gas to be more evenly dispersed into the combustion chamber 3, which helps to enhance the complete combustion effect of the waste.

[0046] Furthermore, the horizontal air distribution duct is located at the bottom of the vertical air distribution duct and is connected to the exhaust port, which allows the pyrolysis mixture entering the combustion chamber 3 to start burning from the bottom of the combustion chamber 3, enhancing the complete combustion effect and preventing unburned pyrolysis mixture from accumulating at the top of the combustion chamber 3, thereby helping to reduce gas emission pollution.

[0047] Furthermore, in some examples, the vertical air distribution duct extends along the height of the pyrolysis gasifier and connects to the first and / or second heat-conducting plates, serving to conduct heat to them. It is understood that the vertical air distribution duct, located within the combustion chamber 3, can absorb a significant amount of heat. Connecting it to the first and / or second heat-conducting plates facilitates the efficient transfer of heat, thereby achieving full energy utilization and improving the thermal efficiency of the pyrolysis gasifier.

[0048] In some embodiments, the air distribution duct assembly further includes a preheating chamber connected to the horizontal air distribution duct, and the exhaust port is connected to the preheating chamber.

[0049] The preheating chamber can be considered as a large-volume cavity. When the horizontal air distribution duct distributes air, a large amount of oxygen-containing gas at room temperature will first enter the preheating chamber. Connecting the exhaust port to the preheating chamber allows the pyrolysis mixture at a higher temperature to condense upon cooling, thereby releasing moisture from the pyrolysis mixture and increasing its dryness. At the same time, the pyrolysis mixture can also heat the oxygen-containing gas, which is more conducive to improving the completeness of waste combustion in the combustion chamber 3.

[0050] In some embodiments, an induced draft fan is also provided on the air distribution duct assembly. The advantage of providing an induced draft fan is that it can enhance the working efficiency of the air distribution duct assembly, increase the flow rate of oxygen-containing gas, and help ensure complete combustion.

[0051] In some embodiments, the pyrolysis gasifier further includes a slag removal chamber 4 located at the lower part of the combustion chamber 3, and a spiral slag removal device 7 is provided in the slag removal chamber 4.

[0052] Understandably, after the waste is fully burned in the combustion chamber 3, it will eventually form a semi-loose slag. The spiral slag removal device 7 can fully disperse and discharge the slag, reduce slag adhesion, and improve the smoothness of discharge.

[0053] The spiral slag removal device 7 can be configured as one or more. For example, in this application, the spiral slag removal device 7 can be configured as one in the longitudinal direction and one in the transverse direction, which can further enhance the slag removal capacity of the pyrolysis gasifier.

[0054] This application also proposes a waste treatment system, which includes the municipal solid waste pyrolysis flue gas recirculation device of any of the above embodiments.

[0055] The waste treatment system of this application may also include other equipment that is matched with the pyrolysis flue gas recirculation equipment for municipal solid waste, such as heating equipment, condensation equipment, intelligent control equipment, sensing and monitoring equipment, and slag removal and conveying equipment, etc., but this application is not limited to these.

[0056] The embodiments described above are not exhaustive and do not limit this application to specific embodiments. Clearly, many modifications and variations can be made based on the above description. Various improvements can be made without departing from the scope of this application, and components can be replaced with equivalents. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any way. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to make good use of this application and modifications based on it. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A waste pyrolysis flue gas recycling device, characterized in that, include: A pyrolysis gasification furnace includes a drying chamber, a pyrolysis chamber, and a combustion chamber arranged sequentially from top to bottom. The drying chamber is provided with a feed inlet. A first heat-conducting plate is provided between the drying chamber and the pyrolysis chamber. A second heat-conducting plate is provided between the pyrolysis chamber and the combustion chamber. Both the first heat-conducting plate and the second heat-conducting plate can connect or separate two adjacent chambers through their own movement. A circulation pipeline assembly is provided in the pyrolysis gasification furnace, the circulation pipeline assembly connecting the pyrolysis chamber and the combustion chamber, so that the pyrolysis mixed gas in the pyrolysis chamber flows to the combustion chamber.

2. The waste pyrolysis flue gas recycling device according to claim 1, characterized in that, The circulating pipeline assembly includes multiple air inlets and multiple exhaust outlets, with the multiple air inlets respectively connected to the pyrolysis chamber and the multiple exhaust outlets respectively connected to the combustion chamber.

3. The municipal solid waste pyrolysis flue gas recirculation equipment according to claim 2, characterized in that, At least a portion of the plurality of air inlets is disposed around the sidewall of the pyrolysis chamber; and / or At least a portion of the plurality of air inlets are disposed at the top of the pyrolysis chamber.

4. The waste pyrolysis flue gas recycling device according to claim 2, characterized in that, The municipal solid waste pyrolysis flue gas circulation equipment also includes an air distribution duct assembly, which is connected to the pyrolysis gasification furnace and partially located in the combustion chamber. The air distribution duct assembly is used to inject oxygen-containing gas into the combustion chamber and is connected to the exhaust port.

5. The waste pyrolysis flue gas recycling device according to claim 4, characterized in that, The air distribution duct assembly includes: A vertical air distribution duct has multiple air distribution openings along the height direction of the pyrolysis gasification furnace. A horizontal air distribution duct is provided at the bottom of the vertical air distribution duct. Multiple air distribution ports are provided on the horizontal air distribution duct along the height direction perpendicular to the pyrolysis gasification furnace. The horizontal air distribution duct is connected to the exhaust port. 6.The waste incineration flue gas recycling device according to claim 5, characterized in that, The air distribution duct assembly further includes a preheating chamber connected to the horizontal air distribution duct, and the exhaust port is connected to the preheating chamber.

7. The waste pyrolysis flue gas recycling device according to claim 6, characterized in that, The air distribution duct assembly is also equipped with an induced draft fan. 8.The waste incineration flue gas recycling device according to claim 5, characterized in that, The vertical air distribution duct extends along the height direction of the pyrolysis gasification furnace and extends to connect with the first heat-conducting plate and / or the second heat-conducting plate, and is used to conduct heat to the first heat-conducting plate and / or the second heat-conducting plate. 9.The waste incineration flue gas recycling device according to claim 1, characterized in that, The pyrolysis gasification furnace also includes a slag removal chamber located at the bottom of the combustion chamber, and a spiral slag removal device is installed in the slag removal chamber.

10. A waste disposal system characterized by, Includes the municipal solid waste pyrolysis flue gas recirculation device as described in any one of claims 1 to 9.

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