Solid waste pyrolysis and fusion integrated treatment system and method

Abstract

According to the solid waste pyrolysis and melting integrated treatment system, the pyrolysis carbonization furnace, the melting furnace and the secondary combustion chamber are combined together and arranged from top to bottom, the air guiding and material scraping structure is arranged at the bottom of the pyrolysis carbonization furnace, pyrolyzed carbide generated after a pyrolysis reaction in the pyrolysis carbonization furnace is crushed through the air guiding and material scraping structure, and pyrolysis slag is obtained; other treatment equipment does not need to be added, the pyrolysis slag is directly fed into the melting furnace for further heating melting treatment in a hot state without being cooled, the material treatment process is shortened, the hot slag is directly melted, waste heat of the slag is avoided, the fed material in the melting furnace is high-temperature hot slag, heat needed for heating the hot slag to the melting temperature in the melting furnace is less, and the energy consumption is reduced. And fixed carbon generated by pyrolysis in the hot slag can be used as a fuel source, so that less fuel is needed for melting, and the construction and operation cost of the heat treatment system is greatly reduced. Meanwhile, the invention further discloses a solid waste pyrolysis and fusion integrated treatment process.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste and hazardous waste treatment, and specifically to a solid waste pyrolysis and melting integrated treatment system and method. Background Art

[0002] Thermal treatment of solid waste and hazardous waste includes incineration, pyrolysis, sintering, melting and other methods. The traditional single treatment methods are all to meet the solid waste treatment goals at the time. For example, incineration is mainly for reduction and harmlessness; pyrolysis is for the resource utilization of a large category of organic solid waste, converting it into combustible gas, fixed carbon, and fuel oil; sintering is mainly used as a pretreatment for solid waste incineration and melting or roasting and calcining treatment for specific product targets; melting is mainly used to render solid waste and hazardous waste harmless and resource-based.

[0003] In the face of the latest requirements of "zero waste city" and "zero landfill" in the field of environmental protection, the above heat treatment methods all have certain shortcomings, as follows: Incineration: high energy consumption, tailings and fly ash need further treatment, harmlessness is not thorough, and resource utilization is not achieved; Pyrolysis: only suitable for the resource utilization of specific large categories of organic solid waste, cannot adapt to complex and multi-type comprehensive solid waste and hazardous waste, and there is also the problem of secondary treatment of tailings and fly ash; Sintering: used for product processing of specific inorganic solid waste, or pre-treatment of solid waste incineration and melting (reduction, drying, conversion of powder into particles or blocks), the product cannot reach the molten glass state; Melting: direct disposal of solid waste has high energy consumption and is not economical.

[0004] In the prior art, some technicians also set two or more thermal treatment technologies at the upstream and downstream of the process respectively, and use multiple independent thermal treatment equipment in a thermal treatment system to perform thermal treatment on solid waste in sequence. Such a multi-stage thermal treatment system will treat the solid waste more thoroughly, but it will cause the thermal treatment system to occupy too much space, and setting up multiple independent process links in the same thermal treatment system will also lead to increased processing costs. Summary of the invention

[0005] In order to solve the problem that the multi-stage heat treatment system in the prior art occupies too much space and the system operation cost is too high, the present invention provides a solid waste pyrolysis and melting integrated treatment system, which can completely decompose solid waste at a relatively low cost and the system occupies a relatively small space. At the same time, the present application also discloses a solid waste pyrolysis and melting integrated treatment process.

[0006] The structure of the present invention is as follows: a solid waste pyrolysis and melting integrated treatment system, which includes: a pyrolysis carbonization furnace, a melting furnace and a secondary combustion chamber, characterized in that: The pyrolysis carbonization furnace and the secondary combustion chamber are both arranged above the melting furnace, and the slag discharge channel of the pyrolysis carbonization furnace is connected to the material inlet of the melting furnace; The bottom of the pyrolysis carbonization furnace is provided with an air-guiding scraping structure and a discharge hopper; the waste to be processed in the pyrolysis carbonization furnace is accumulated above the air-guiding scraping structure, and the air-guiding scraping structure is connected to the discharge hopper; the discharge hopper has a structure that is narrow at the top and wide at the bottom, and a slag discharge channel is provided at the bottom to be connected to the melting furnace; A pyrolysis fume exhaust port is provided at the top of the pyrolysis carbonization furnace, and two fume ducts are provided at the pyrolysis fume exhaust port, one of which is connected to the melting furnace and the other is connected to the fuel air inlet at the bottom of the secondary combustion chamber; The melting fume outlet of the melting furnace is connected to the secondary combustion chamber fume inlet arranged at the bottom of the secondary combustion chamber; the secondary combustion chamber fume outlet is arranged on the top side of the secondary combustion chamber; The melting furnace is provided with a flue gas bypass outlet, and the flue gas bypass outlet is connected to the heat source gas inlet at the bottom of the pyrolysis carbonization furnace based on a flue gas pipeline.

[0007] It is further characterized by: The wind-guiding and scraping structure comprises: a rotary drive motor, a rotary support shaft and grate bars; The grate bars are generally hollow structures with an inverted bowl shape that is high in the middle and low on both sides, with gaps between adjacent grate bars, and the arched parts of the grate bars facing the inner cavity of the pyrolysis carbonization furnace; the bottom of the grate is rotatably mounted on the bottom plate of the pyrolysis carbonization furnace; the waste to be processed in the pyrolysis carbonization furnace is accumulated above the arched part of the grate; The top of the rotating support shaft is arranged at the center of the wind-guiding and scraping structure, and the rotating driving motor drives the wind-guiding and scraping structure to rotate relative to the furnace body of the pyrolysis and carbonization furnace based on the rotating support shaft; A burner is arranged on the bottom side of the pyrolysis carbonization furnace; a waste material inlet is arranged on the top; and the material column areas in the inner cavity of the pyrolysis carbonization furnace are respectively: a sintering area, a pyrolysis incineration area, and a drying and preheating area from bottom to top; The top of the melting furnace is provided with a hot slag inlet, a melting fume outlet and an auxiliary material feeding port; the side wall of the furnace body is provided with: a fume bypass outlet, a secondary air inlet and a primary air inlet from top to bottom; The inner cavity of the melting furnace is divided into a gas phase zone, a melting reaction zone and a molten pool zone from top to bottom; the gas phase zone is used for partial secondary combustion of the melting flue gas and is arranged above the secondary air inlet; the molten pool zone is used for temporary storage of the melt and is arranged in the area below the primary air inlet; the melting reaction zone is used for high-temperature melting reaction of the material and is arranged between the primary air inlet and the molten liquid surface; The secondary combustion chamber fume inlet of the secondary combustion chamber and the molten fume outlet of the smelting furnace are connected via a transition section which is wide at the top and narrow at the bottom, and a secondary combustion chamber combustion-supporting air device is arranged above the transition section.

[0008] A solid waste pyrolysis and melting integrated treatment process, comprising the following steps; S1: The waste to be processed is sent into a pyrolysis carbonization furnace for pretreatment; In the pretreatment, the waste to be treated is subjected to a pyrolysis reaction, and part of the organic components in the waste are converted into combustible gas and enter the pyrolysis flue gas, while another part of the organic components are carbonized into fixed carbon and enter the pyrolysis slag together with the inorganic components; S2: The pyrolysis slag is directly sent to the melting furnace in a hot state without cooling for further heating and melting treatment; The pyrolysis flue gas with combustible gas is sent to the secondary combustion chamber for secondary incineration and decomposition; S3: A portion of the high-temperature molten flue gas generated in the melting furnace is sent to the secondary combustion chamber for secondary incineration and decomposition; The valuable metals in the waste to be treated are precipitated and accumulated at the bottom of the melting furnace, and other solid substances generated after the melting reaction are discharged in the form of glass; S4: The flue gas in the secondary combustion chamber is secondary incinerated, and the secondary combustion flue gas generated is sent to the subsequent flue gas treatment system.

[0009] It is further characterized by: In step S3, a portion of the high-temperature molten flue gas generated in the melting furnace is led out to enter the pyrolysis carbonization furnace as a pyrolysis heat source and combustion-supporting air; In step S2, a portion of the pyrolysis flue gas containing combustible gas is drawn out and sent into the melting furnace together with the secondary air as an auxiliary combustion gas.

[0010] The present application provides a solid waste pyrolysis and melting integrated treatment system, which combines a pyrolysis carbonization furnace, a melting furnace and a secondary combustion chamber, and is arranged from top to bottom, thereby reducing the system's footprint; an air guide scraping structure is arranged at the bottom of the pyrolysis carbonization furnace, and the pyrolysis carbide generated after the pyrolysis reaction in the pyrolysis carbonization furnace is crushed by the air guide scraping structure to obtain pyrolysis slag, without adding other processing equipment, and the pyrolysis slag is directly sent to the melting furnace in a hot state without cooling for further heating and melting treatment, which not only shortens the material processing process but also directly melts the hot slag to avoid the waste of slag heat, and the feed in the melting furnace is high-temperature hot slag, so the heat required to raise the hot slag to the melting temperature in the melting furnace is less, and the fixed carbon produced by pyrolysis in the hot slag can be used as a fuel source, so the fuel required for melting is less, thereby greatly reducing the construction and operation costs of the heat treatment system in the present application. At the same time, because the hot slag reduces the heat demand required for melting, that is, the melting process does not require a large amount of oxygen and fuel, it also reduces the oxygen-rich concentration demand in the melting combustion wind, and reduces the combustion cost required for the melting furnace. Two flue gas pipes are set at the pyrolysis flue gas discharge port, one is connected to the secondary air inlet of the melting furnace, and the other is connected to the fuel air inlet at the bottom of the secondary combustion chamber. Because the pyrolysis flue gas contains combustible gas, it can be used as the fuel required for melting after being sent to the melting furnace, saving the fuel consumption of the melting furnace. The other part of the pyrolysis flue gas enters the secondary combustion chamber, where the combustible components are further burned and harmful substances are decomposed at high temperature. The secondary combustion chamber does not need to input additional fuel, which reduces the system operation cost. Part of the molten flue gas is used as the heat source required for the pyrolysis reaction in the pyrolysis carbonization furnace through the flue gas bypass outlet, ensuring that the waste heat of the flue gas is effectively utilized. At the same time, the pyrolysis carbonization furnace does not require other additional heat sources, further reducing the system operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a solid waste pyrolysis and melting integrated treatment system; Figure 2 for Figure 1 The structure after enlargement at A in the middle; Figure 3 This is the grate bar structure example 1; Figure 4 This is the grate bar structure example 2; Figure 5 This is the grate bar structure example 3. DETAILED DESCRIPTION

[0012] like Figure 1 As shown, the present application includes a solid waste pyrolysis and melting integrated treatment system, which includes: a pyrolysis carbonization furnace 1, a melting furnace 2 and a secondary combustion chamber 3.

[0013] The pyrolysis carbonization furnace 1 and the secondary combustion chamber 3 are arranged above the melting furnace 2. The slag discharge channel 104 of the pyrolysis carbonization furnace 1 is connected to the material inlet of the melting furnace 2. The melting flue gas outlet 202 of the melting furnace 2 is connected to the secondary combustion chamber flue gas inlet arranged at the bottom of the secondary combustion chamber 3; the secondary combustion chamber flue gas outlet 302 is arranged on the top side of the secondary combustion chamber 3.

[0014] In this embodiment, the pyrolysis carbonization furnace is a vertical cylindrical structure, with a burner 103 arranged on the bottom side; a waste inlet 101 is arranged on the top; the waste to be processed enters from the waste inlet 101 and forms a material column in the furnace. The material column areas in the inner cavity of the pyrolysis carbonization furnace are respectively: sintering area, pyrolysis incineration area, and drying preheating area from bottom to top, and the corresponding temperatures are also from high to low. In specific applications, the interior of the pyrolysis carbonization furnace 1 in this application is a pyrolysis carbonization furnace above 800 degrees Celsius.

[0015] An air-guiding scraping structure 4 and a discharge hopper 5 are provided at the bottom of the pyrolysis carbonization furnace 1. The waste to be processed in the pyrolysis carbonization furnace is accumulated above the air-guiding scraping structure, and the air-guiding scraping structure is connected to the discharge hopper. The burner 103 is arranged on one side of the sintering zone at the bottom of the pyrolysis carbonization furnace, which is used for ignition in the furnace start-up stage and irregular heat compensation when the heat is insufficient; the air-guiding scraping structure facilitates the introduction of air and heat source flue gas from the bottom of the pyrolysis carbonization furnace through its own hollow structure, so that the pyrolysis reaction in the sintering zone at the bottom of the pyrolysis carbonization furnace can fully occur, and at the same time, the carbide produced after sintering is scraped by the air-guiding scraping structure and the fragments fall from the edge or its own gaps and are discharged into the discharge hopper 5.

[0016] The air-guiding scraping structure 4 includes: a rotating drive motor 401, a rotating support shaft 402 and grate bars 403; the grate bars 403 are generally an inverted bowl-shaped arched hollow structure with a high middle and low sides, and gaps are left between adjacent grate bars 403, and the arched parts of the grate bars 403 face the inner cavity of the pyrolysis carbonization furnace 1; the bottom of the grate 403 is rotatably installed on the bottom plate 103 of the pyrolysis carbonization furnace; the waste 6 to be processed in the pyrolysis carbonization furnace 1 is accumulated above the arched part of the grate 403; the top of the rotating support shaft 402 is set at the center of the air-guiding scraping structure, and the rotating drive motor 401 drives the air-guiding scraping structure and the furnace body of the pyrolysis carbonization furnace to rotate relative to each other based on the rotating support shaft 402.

[0017] When the pyrolysis carbonization furnace is in operation, the high-temperature carbides sintered at the bottom of the material column of the waste material 6 to be processed are scraped and broken by the grate bars 403, and the high-temperature broken materials are thrown off the edge of the grate when the inverted bowl-shaped grate 403 rotates, and discharged into the discharge hopper 5. The discharge hopper 5 has a narrow structure at the top and a wide structure at the bottom, and collects the broken materials falling from the top, and discharges them into the melting furnace 2 through the slag discharge channel 104 set at the bottom.

[0018] The specific shape of the grate bar 403 is as follows: Figure 3 , Figure 4 and Figure 5As shown, it can be based on the grate bars radiating from the center to the surroundings, or it can be a mesh structure, or it can be a structure based on all the grate bars are parallel. Processing is carried out according to actual needs. After the grate bars are processed, they are rotatably installed on the bottom plate 103 of the pyrolysis carbonization furnace based on the bearing structure.

[0019] In the present application, the pyrolysis and carbonization reaction of the pyrolysis and carbonization furnace 1 is carried out at the bottom of the furnace chamber, the middle pyrolysis and incineration zone undergoes partial pyrolysis and partial incineration reaction, and the top drying and preheating zone undergoes only preheating and drying. The pyrolysis flue gas discharged from the top contains a large amount of carbon monoxide, which is a combustible gas. Therefore, a pyrolysis flue gas discharge port 102 is provided at the top of the pyrolysis and carbonization furnace 1. Two flue gas ducts are provided at the pyrolysis flue gas discharge port 102, one of which is connected to the secondary air inlet 205 of the melting furnace 2, and the other is connected to the fuel air inlet at the bottom of the secondary combustion chamber 3. After the pyrolysis flue gas is drawn out by the induced draft fan 7, it is respectively sent to the melting furnace 2 and the secondary combustion chamber 3. Because the pyrolysis flue gas contains combustible gas, it can be used as the fuel required for melting after being sent to the melting furnace, saving the fuel consumption of the melting furnace. The other part of the pyrolysis flue gas enters the secondary combustion chamber together with the molten flue gas discharged from the molten flue gas outlet 202, wherein the combustible components (such as carbon monoxide) are further burned and harmful substances (such as dioxins) are decomposed by high temperature. The secondary combustion chamber also does not need to input additional fuel, further reducing the system operation cost.

[0020] The melting furnace 2 is a horizontal structure with a rectangular cross-section, with a hot slag inlet 201, a molten fume outlet 202 and an auxiliary material feeding port 203 arranged on its top; and a fume bypass outlet 204, a secondary air inlet 205 and a primary air inlet 207 arranged on the side wall of the furnace from top to bottom.

[0021] The inner cavity of the melting furnace 2 is divided into a gas phase zone, a melting reaction zone and a molten pool zone from top to bottom; the gas phase zone is used for partial secondary combustion of the molten flue gas, and there is a large amount of high-temperature flue gas, which is arranged above the secondary air inlet 205. The gas phase zone is located above the molten liquid surface, specifically including the secondary air inlet upward to the inside of the furnace top. The molten pool zone is used for temporary storage of the melt and is arranged in the area below the primary air inlet 207. The melting reaction zone is used for high-temperature melting reaction of materials and is arranged between the primary air inlet 207 and the molten liquid surface. When the melting furnace is initially started, fuel is placed at the bottom of the molten pool zone, and the material falls and melts immediately, and the molten pool zone is formed into a molten pool. After the molten pool is formed, heat accumulates, and subsequently, only a part of the fuel needs to be slowly added to make up for the heat loss and maintain the temperature.

[0022] The hot slag fragments falling into the hot slag inlet 201 fall into the bottom molten pool area and are melted by the high temperature in the melting area. After the hot slag is melted, the organic matter and fuel will gasify and rise to the gas phase area, and the inorganic matter will melt and remain in the bottom melting area.

[0023] Because the pyrolysis reaction in the pyrolysis carbonization furnace 1 requires a lot of heat energy to react, the pyrolysis temperature in this embodiment is about 800 degrees, and the oxygen content of the flue gas in the gas phase zone of the melting furnace 2 is very low, and the temperature is very high between 1200 and 1400, which is very suitable as a pyrolysis heat source. Therefore, the melting furnace 2 is provided with a flue gas bypass outlet 204, and the flue gas bypass outlet 204 is connected to the heat source gas inlet at the bottom of the pyrolysis carbonization furnace based on the flue gas pipeline. Part of the molten flue gas is used as the heat source required for pyrolysis through the flue gas bypass outlet 204 to ensure that the waste heat of the flue gas is effectively utilized.

[0024] In this embodiment, the gas phase zone of the melting furnace adopts an insulating refractory material or a water jacket + refractory material structure, the melting reaction zone adopts a copper water jacket structure, and the molten pool zone adopts an insulating refractory material. The melting furnace is provided with a glass slag discharge port 206 and a slag discharge chute on the side of the upper part of the molten pool area. A metal discharge port or an emergency slag discharge port is provided on the side of the bottom of the molten pool area. Compared with a single incineration disposal, the output of this system is glass slag, which does not have problems such as reduction rate, leaching toxicity, heavy metals, dioxins, etc. It is a harmless solid material that can be recycled, avoiding the problem that the ash produced by incineration needs secondary landfill or further melting treatment. In actual application, the valuable metals in the solid waste can be precipitated and accumulated at the bottom of the melting furnace, achieving a certain amount of metal extraction and bringing certain benefits.

[0025] To ensure that the slag discharge of the melting furnace meets the requirements, a certain amount of melting aid (auxiliary materials containing calcium, silicon, iron, and auxiliary fuel if necessary) needs to be added through the auxiliary material feeding port 203 at the top of the melting furnace based on the melting batching system 305. Fly ash generated by flue gas treatment downstream of the system is also added through the auxiliary material feeding port.

[0026] The secondary combustion chamber flue gas inlet of the secondary combustion chamber 3 and the molten flue gas outlet 202 of the melting furnace 2 are connected by a transition section 301 that is wide at the top and narrow at the bottom, and a secondary combustion chamber combustion-supporting air device 304 is arranged above the transition section 301. The flue gas discharged from the molten flue gas outlet 202 enters the secondary combustion chamber 3 through the narrow and wide at the top transition section 301, and the gas diffusion is fully mixed with the combustion-supporting air sent in by the secondary combustion chamber combustion-supporting air device 304, thereby improving the combustion efficiency in the secondary combustion chamber.

[0027] Usually, the secondary combustion chamber 3 needs to be maintained at around 1100 degrees to completely decompose organic matter and harmful substances. The temperature of the flue gas sent up from the gas phase zone of the melting furnace 2 is around 1300 degrees, and the heat is sufficient for the secondary combustion chamber, so a part of it can be used as a heat source for pyrolysis; and the secondary combustion chamber does not need to add other heat sources, and the heat in the flue gas discharged from the secondary combustion chamber is recovered through boilers and other means.

[0028] The process for treating waste materials based on the above-mentioned solid waste pyrolysis and melting integrated system includes the following steps.

[0029] S1: The waste material 6 to be processed is sent into the pyrolysis carbonization furnace 1 for pretreatment; In the pretreatment, the waste material 6 to be treated is subjected to a pyrolysis reaction, and part of the organic components in the waste material are converted into combustible gas and enter the pyrolysis flue gas, while another part of the organic components are carbonized into fixed carbon and enter the pyrolysis slag together with the inorganic components.

[0030] S2: The pyrolysis slag is directly sent to the melting furnace 2 in a hot state without cooling for further heating and melting treatment; the pyrolysis flue gas with combustible gas is sent to the secondary combustion chamber 3 for secondary incineration and decomposition; In step S2, a portion of the pyrolysis flue gas containing combustible gas is drawn out and sent into the melting furnace 2 together with the secondary air through the secondary air inlet 205 to serve as a combustion-supporting gas.

[0031] S3: The high-temperature molten flue gas generated in the melting furnace 2 is sent to the secondary combustion chamber 3 for secondary incineration and decomposition.

[0032] Valuable metals in the waste material 6 to be processed are precipitated and accumulated at the bottom of the melting furnace 2, and other solid substances generated after the melting reaction are discharged as slag in the form of glass.

[0033] A portion of the high-temperature molten flue gas generated in the melting furnace 2 is led out to enter the pyrolysis carbonization furnace as a pyrolysis heat source and combustion-supporting air.

[0034] S4: The flue gas in the secondary combustion chamber 3 is secondary incinerated, and the secondary incineration flue gas generated is sent to the subsequent flue gas treatment system for purification and then discharged.

[0035] In the present application, pyrolysis is used as a pretreatment of the material, and melting is used as a subsequent disposal method. Compared with directly melting the material, pyrolysis and melting are used together to treat solid hazardous waste, making full use of the calorific value of the material itself, and at the same time, the waste heat of the high-temperature molten flue gas is used as a pyrolysis heat source, which greatly improves the operating cost.

[0036] Compared with the two-stage treatment method of solid waste in the prior art, that is, pyrolysis or incineration of the material first and then feeding the cold slag into a melting furnace for treatment, the process of the present invention is shorter, the hot slag is directly melted to avoid the waste of slag heat, and a large amount of fixed carbon exists in the pyrolysis slag which can be used as fuel for downstream melting, thereby reducing the construction and operation costs.

[0037] In the present application, the pyrolysis process converts part of the organic components into combustible gas and enters the flue gas, while part of the organic components are carbonized into fixed carbon and enter the pyrolysis slag; the pyrolysis slag is directly sent to the melting furnace in a hot state without cooling for further heating and melting treatment; the pyrolysis flue gas with combustible gas is finally mixed with the high-temperature flue gas of the downstream melting furnace and fully incinerated and decomposed in the secondary combustion chamber; a part of the high-temperature flue gas of the melting furnace is drawn into the pyrolysis carbonization furnace as a pyrolysis heat source and combustion-supporting air, and the sensible heat of this molten flue gas is used as a heat source for pyrolysis, and at the same time, this flue gas contains a small amount of oxygen, which can participate in the pyrolysis reaction. The present invention realizes the direct conversion of complex comprehensive solid hazardous waste into vitreous slag through the integrated process of pyrolysis and melting. The vitreous slag meets the requirements of the national standard GB41015 and can be further utilized as a resource.

Claims

1. A solid waste pyrolysis and melting integrated treatment system, comprising: The pyrolysis carbonization furnace, melting furnace and secondary combustion chamber are characterized by: The pyrolysis carbonization furnace and the secondary combustion chamber are both arranged above the melting furnace, and the slag discharge channel of the pyrolysis carbonization furnace is connected to the material inlet of the melting furnace; The bottom of the pyrolysis carbonization furnace is provided with an air-guiding scraping structure and a discharge hopper; the waste to be processed in the pyrolysis carbonization furnace is accumulated above the air-guiding scraping structure, and the air-guiding scraping structure is connected to the discharge hopper; the discharge hopper has a structure that is narrow at the top and wide at the bottom, and a slag discharge channel is provided at the bottom to be connected to the melting furnace; A pyrolysis fume exhaust port is provided at the top of the pyrolysis carbonization furnace, and two fume ducts are provided at the pyrolysis fume exhaust port, one of which is connected to the melting furnace and the other is connected to the fuel air inlet at the bottom of the secondary combustion chamber; The melting fume outlet of the melting furnace is connected to the secondary combustion chamber fume inlet arranged at the bottom of the secondary combustion chamber; the secondary combustion chamber fume outlet is arranged on the top side of the secondary combustion chamber; The melting furnace is provided with a flue gas bypass outlet, and the flue gas bypass outlet is connected to the heat source gas inlet at the bottom of the pyrolysis carbonization furnace based on a flue gas pipeline.

2. According to claim 1, a solid waste pyrolysis and melting integrated treatment system is characterized by: The wind-guiding and scraping structure comprises: a rotary drive motor, a rotary support shaft and grate bars; The grate bars are generally hollow structures with an inverted bowl shape that is high in the middle and low on both sides, with gaps between adjacent grate bars, and the arched parts of the grate bars facing the inner cavity of the pyrolysis carbonization furnace; the bottom of the grate is rotatably mounted on the bottom plate of the pyrolysis carbonization furnace; the waste to be processed in the pyrolysis carbonization furnace is accumulated above the arched part of the grate; The top of the rotating support shaft is arranged at the center of the air guiding and scraping structure, and the rotating driving motor drives the air guiding and scraping structure and the furnace body of the pyrolysis carbonization furnace to generate relative rotation based on the rotating support shaft.

3. According to claim 1, a solid waste pyrolysis and melting integrated treatment system is characterized by: A burner is arranged on the bottom side of the pyrolysis carbonization furnace; a waste material inlet is arranged on the top; and the material column areas in the inner cavity of the pyrolysis carbonization furnace are respectively: a sintering area, a pyrolysis incineration area, and a drying and preheating area from bottom to top.

4. The solid waste pyrolysis and melting integrated treatment system according to claim 1, characterized in that: The top of the melting furnace is provided with a hot slag inlet, a melting fume outlet and an auxiliary material feeding port; the side wall of the furnace body is provided with: a fume bypass outlet, a secondary air inlet and a primary air inlet from top to bottom; The inner cavity of the melting furnace is divided into a gas phase zone, a melting reaction zone and a molten pool zone from top to bottom; the gas phase zone is used for partial secondary combustion of the molten flue gas and is arranged above the secondary air inlet; the molten pool zone is used for temporary storage of the melt and is arranged in the area below the primary air inlet; the melting reaction zone is used for high-temperature melting reaction of the material and is arranged between the primary air inlet and the molten liquid surface.

5. The solid waste pyrolysis and melting integrated treatment system according to claim 4, characterized in that: The secondary combustion chamber fume inlet of the secondary combustion chamber and the molten fume outlet of the smelting furnace are connected via a transition section which is wide at the top and narrow at the bottom, and a secondary combustion chamber combustion-supporting air device is arranged above the transition section.

6. A solid waste pyrolysis and melting integrated treatment process, comprising the following steps ； S1: The waste to be processed is sent into a pyrolysis carbonization furnace for pretreatment; In the pretreatment, the waste to be treated is subjected to a pyrolysis reaction, and part of the organic components in the waste are converted into combustible gas and enter the pyrolysis flue gas, while another part of the organic components are carbonized into fixed carbon and enter the pyrolysis slag together with the inorganic components; S2: The pyrolysis slag is directly sent to the melting furnace in a hot state without cooling for further heating and melting treatment; The pyrolysis flue gas with combustible gas is sent to the secondary combustion chamber for secondary incineration and decomposition; S3: A portion of the high-temperature molten flue gas generated in the melting furnace is sent to the secondary combustion chamber for secondary incineration and decomposition; The valuable metals in the waste to be treated are precipitated and accumulated at the bottom of the melting furnace, and other solid substances generated after the melting reaction are discharged in the form of glass; S4: The flue gas in the secondary combustion chamber is secondary incinerated, and the secondary combustion flue gas generated is sent to the subsequent flue gas treatment system.

7. The solid waste pyrolysis and melting integrated treatment process according to claim 6, characterized in that: In step S3, a portion of the high-temperature molten flue gas generated in the melting furnace is led out to enter the pyrolysis carbonization furnace as a pyrolysis heat source and combustion-supporting air.

8. The solid waste pyrolysis and melting integrated treatment process according to claim 6, characterized in that: In step S2, a portion of the pyrolysis flue gas containing combustible gas is drawn out and sent into the melting furnace together with the secondary air as an auxiliary combustion gas.

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