Solid waste pyrolysis activation treatment system and method

Abstract

The invention discloses a solid waste pyrolysis activation treatment system and method, and relates to the field of solid waste treatment. The system comprises a hot blast stove, and a pyrolyzing furnace, a decarburization combustion furnace and an oxidation activation furnace which are sequentially arranged from top to bottom, the pyrolyzing furnace comprises an outer cavity and a first furnace body, the first furnace body penetrates through the outer cavity and is rotationally and hermetically connected with the outer cavity, and the outer cavity is used for introducing heating gas; the first furnace body is used for pyrolyzing solid waste, and the first furnace body communicates with a hot blast stove gas phase and is used for introducing pyrolysis gas; the decarburization combustion furnace comprises a second furnace body, the feeding end of the decarburization combustion furnace is in solid phase communication with the discharging end of the first furnace body, and solid waste is combusted and decarburized in the second furnace body; the discharge end of the second furnace body is communicated with the outer cavity gas phase and is used for introducing high-temperature flue gas; the oxidation activation furnace comprises a third furnace body, the feeding end is in solid phase communication with the discharging end of the second furnace body, and the oxidation activation furnace is used for oxidizing and activating solid waste; the third furnace body is communicated with the hot-blast stove gas and is used for introducing high-temperature flue gas; and the discharge end of the third furnace body is communicated with the outer cavity gas phase and is used for introducing high-temperature flue gas.

Description

Technical Field

[0001] The invention relates to the technical field of solid waste treatment, and in particular to a solid waste pyrolysis activation treatment system and method. Background Art

[0002] Solid waste with a certain calorific value, such as coal-based solid waste raw materials, including coal gangue, gasification slag, etc., can be treated by combustion and pyrolysis to obtain raw materials that can be used as other chemical products. For example, kaolin and silica in coal gangue can react to form mullite or corundum, or after pyrolysis and other treatments, the products obtained can be used to extract silicon and aluminum.

[0003] The existing combustion and calcination activation of solid waste are all carried out in a large space, which causes the uncontrollable concentrated release of the calorific value of the solid waste. The calorific value of the material directly affects the final result of the process, and the obtained product cannot meet the process requirements of fine chemicals. At the same time, the uncontrollable release of calorific value also leads to low utilization of the material's own heat, high energy consumption, and increased system operating costs. Summary of the invention

[0004] The purpose of the present invention is to provide a solid waste pyrolysis activation treatment system and method to achieve orderly and controllable release of the calorific value of the solid waste, so that the obtained product meets the process requirements, improves the utilization rate of the solid waste's own heat, reduces energy consumption, and reduces operating costs.

[0005] In a first aspect, the present invention provides a solid waste pyrolysis activation treatment system, comprising a hot blast furnace and a pyrolysis furnace, a decarbonization combustion furnace and an oxidation activation furnace arranged in sequence from top to bottom; The pyrolysis furnace comprises an outer cavity and a first furnace body, the first furnace body passes through the outer cavity and is rotatably sealed with the outer cavity, the outer cavity is used to introduce heating gas and heat the first furnace body; the first furnace body is used to pyrolyze the introduced solid waste, and the discharge end of the first furnace body is in gas communication with the hot blast furnace, and is used to introduce pyrolysis gas into the hot blast furnace; The decarbonization combustion furnace comprises a rotatable second furnace body, the feed end of the second furnace body is solidly connected with the discharge end of the first furnace body, and the solid waste is burned and decarbonized in the second furnace body; the discharge end of the second furnace body is gaseously connected with the outer cavity, so as to introduce high-temperature flue gas into the outer cavity; The oxidation activation furnace includes a rotatable third furnace body, the feed end of the third furnace body is solidly connected with the discharge end of the second furnace body, and the third furnace body is used to heat, oxidize and activate the solid waste; at least one end of the third furnace body is gaseously connected with the hot blast furnace, and is used to introduce high-temperature flue gas into the third furnace body; the discharge end of the third furnace body is gaseously connected with the outer cavity, and is used to introduce high-temperature flue gas into the outer cavity.

[0006] In some possible implementations, the feed end of the second furnace body is in gas communication with the hot blast furnace, so as to introduce high-temperature gas into the second furnace body; And / or, the feeding end of the second furnace body is further provided with a first air supplement and combustion supplement channel for introducing air or heating gas into the second furnace body; And / or, a second air and combustion supplement channel is further provided at the feed end of the third furnace body for introducing air or heating gas into the third furnace body.

[0007] In some possible implementations, a plurality of smoke inlets arranged along the axial direction of the first furnace body are disposed at the bottom of the outer cavity, and each of the smoke inlets is provided with a control valve.

[0008] In some possible implementations, the decarbonization combustion furnace further includes a hollow heat-insulating cover, which is sleeved on the outer wall of the second furnace body, and an annular heat-insulating cavity is formed between the hollow heat-insulating cover and the second furnace body; And / or, the oxidation activation furnace further comprises a hollow heat-insulating cover, wherein the hollow heat-insulating cover is sleeved on the outer wall of the third furnace body, and an annular heat-insulating cavity is formed between the hollow heat-insulating cover and the third furnace body.

[0009] In some possible implementations, the inner walls of the first furnace body, the second furnace body, and the third furnace body are all fixedly provided with spiral material channels spiraling along their axial directions, so that the solid waste can spirally roll and move in the spiral material channels during the rotation of the first furnace body, the second furnace body, and the third furnace body; And / or, the outer wall of the first furnace body is further provided with an air scoop plate, and the air scoop plate extends into the outer cavity to evenly distribute the airflow in the outer cavity.

[0010] In some possible implementations, the outer wall of the first furnace body is provided with a plurality of hollow bodies arranged in a spiral direction and / or in a circumferential direction, one end of the hollow body is connected to the interior of the first furnace body, the other end of the hollow body is closed, an angle is formed between the axis of the hollow body and the outer wall of the first furnace body, and the solid waste entering the hollow body can be in contact with the heating gas in the outer cavity for heat exchange and be thrown into the first furnace body; And / or, the outer wall of the second furnace body is provided with a plurality of hollow bodies arranged in a spiral direction and / or in a circumferential direction, one end of the hollow body is connected to the interior of the second furnace body, the other end of the hollow body is closed, an angle is formed between the axis of the hollow body and the outer wall of the second furnace body, and the solid waste entering the hollow body can be thrown into the second furnace body; And / or, the outer wall of the third furnace body is provided with a plurality of hollow bodies arranged in a spiral direction and / or in a circumferential direction, one end of the hollow body is connected to the interior of the third furnace body, and the other end of the hollow body is closed, and an angle is formed between the axis of the hollow body and the outer wall of the third furnace body, so that the solid waste entering the hollow body can be thrown into the third furnace body.

[0011] In some possible implementations, a temporary discharge port is provided at the discharge end of the second furnace body; And / or, a temporary discharge port is provided at the discharge end of the third furnace body.

[0012] In some possible implementations, the feed end of the oxidation activation furnace feeds through a feed screw, and a speed reduction and material equalization cover is provided above the feed port of the feed screw to reduce the speed at which the solid waste discharged from the discharge end of the second furnace body falls into the feed screw and allows the solid waste to enter the feed screw evenly.

[0013] Compared with the prior art, the solid waste pyrolysis and activation treatment system provided by the present application first passes solid waste with a certain calorific value into the first furnace body of the pyrolysis furnace, heats the first furnace body by the heating gas in the outer cavity, and then heats the partition wall of the solid material in the first furnace body, so that the solid material is first heated, dried and pyrolyzed in the first furnace body to precipitate water and volatiles, the volatiles in the solid waste are reduced to below 2%, the water content is reduced to below 0.1%, and the temperature of the solid waste itself is raised to above 250°C, reaching a temperature that can self-stable combustion, thereby achieving enthalpy increase of the solid waste, and the obtained volatiles are passed into the hot blast furnace as pyrolysis gas for combustion as the heat reserve of the system, so that the heat of the solid waste is released in an orderly and controllable manner for the first time in the pyrolysis furnace. Afterwards, the solid waste with increased enthalpy is passed from the discharge end of the first furnace body into the second furnace body of the decarbonization combustion furnace. At this time, the solid waste has reached the temperature of self-stable combustion. Therefore, it is stably burned in the environment of the second furnace body where the moisture and volatile matter content are almost zero. The operation time and speed of the second furnace body can be controlled independently to achieve centralized and sufficient decarbonization of the solid waste. The temperature of the solid material is further increased, completing the second orderly and controllable release of the heat of the solid waste. At the same time, the high-temperature flue gas generated in the second furnace body is passed into the outer cavity of the pyrolysis furnace to heat the wall of the first furnace body. Finally, the decarbonized solid waste is passed from the discharge end of the second furnace body into the third furnace body of the oxidation activation furnace. At this time, the temperature of the solid waste is not less than 750°C. On this basis, the high-temperature flue gas generated by the previous pyrolysis gas passing into the hot blast furnace is passed into the third furnace body to contact and heat the solid waste, providing stable heat for the oxidation activation of the solid waste in the third furnace body. By controlling the operation time and speed of the third furnace body separately, the concentrated and sufficient oxidation activation treatment of the solid waste is achieved, so that the obtained product can meet the subsequent process requirements. At the same time, the high-temperature flue gas generated in the third furnace body is passed into the outer cavity of the pyrolysis furnace to heat the first furnace body. Compared with the existing solid waste combustion and calcination activation treatment in a large space, this system realizes the orderly and controllable release of the calorific value of the solid waste through the pyrolysis furnace, the decarbonization combustion furnace and the oxidation activation furnace, and makes full use of the heat of the pyrolysis gas obtained by the pyrolysis of the solid material, as well as the heat of the high-temperature flue gas generated in the solid material treatment process, improving the utilization rate of its own heat, reducing the consumption of external energy, and reducing the system operation cost.

[0014] In a second aspect, the present application further provides a solid waste pyrolysis activation treatment method, based on any of the solid waste pyrolysis activation treatment systems described above, the solid waste pyrolysis activation treatment method comprises: Step 1: introducing solid waste into the first furnace body of the pyrolysis furnace, introducing heating gas into the outer cavity of the pyrolysis furnace, performing inter-wall heating on the solid waste, drying the water, obtaining pyrolysis gas, and introducing the pyrolysis gas into the hot blast furnace for combustion to obtain high-temperature flue gas; Step 2: passing the solid waste heated in the first furnace body into the second furnace body of the decarbonization combustion furnace for decarbonization combustion, and passing the high-temperature flue gas generated in the second furnace body into the outer cavity to participate in the partition wall heating; Step three: pass the solid waste that has undergone decarbonization and combustion in the second furnace body into the third furnace body of the oxidation activation furnace for calcination and activation. At the same time, pass the high-temperature flue gas from the hot blast furnace into the third furnace body to supplement the heating of the solid waste, and pass the high-temperature flue gas generated in the third furnace body into the outer cavity to participate in the partition wall heating.

[0015] In some possible implementations, the step 2 further includes: passing the high-temperature flue gas of the hot blast stove into the second furnace body for supplementary heating; And / or, the step 2 further comprises: introducing air or heating gas into the second furnace body through the first air supplement and combustion supplement channel; And / or, the step three also includes: introducing air or heating gas into the third furnace body through a second air and combustion supply channel.

[0016] Compared with the prior art, the solid waste pyrolysis activation treatment method in the present application uses any of the solid waste pyrolysis activation treatment systems in the above items, and therefore has the same beneficial effects as the system, which will not be described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 A schematic diagram of the structure of a solid waste pyrolysis activation treatment device provided by an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of the pyrolysis furnace; Figure 3 for Figure 1 The structural schematic diagram of the decarbonization combustion furnace; Figure 4 for Figure 1 A schematic diagram of the structure of the oxidation activation furnace; Figure 5 A schematic diagram of the structure of another pyrolysis furnace provided in an embodiment of the present invention; Figure 6 for Figure 1 Schematic diagram of the structure of the hot air stove.

[0018] Figure numerals: 1, frame; 2, pyrolysis furnace; 21, outer cavity; 211, flue gas outlet; 212, flue gas inlet; 213, control valve; 22, first furnace body; 221, first furnace tail; 222, first furnace head; 23, spiral material channel; 24, air scoop plate; 25, hollow body; 3, decarbonization combustion furnace; 31, second furnace body; 311, second furnace head; 312, second furnace tail; 32, hollow heat insulation cover; 321, annular heat insulation Cavity; 33, lifting plate; 4, pyrolysis gas duct; 5, hot blast furnace; 51, air supply component; 6, first air supply and supplementary combustion channel; 7, first flue gas duct; 8, oxidation activation furnace; 81, third furnace body; 811, third furnace head; 812, third furnace tail; 9, tail gas treatment device; 10, feed screw; 11, temporary discharge port; 12, speed reduction and equalization cover; 13, second air supply and supplementary combustion channel; 14, valve; 15, second flue gas duct. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0022] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figure 1-Figure 6 As shown, an embodiment of the present invention provides a solid waste pyrolysis activation treatment system, including a hot blast furnace 5 and a pyrolysis furnace 2, a decarbonization combustion furnace 3 and an oxidation activation furnace 8 arranged in sequence from top to bottom. Specifically, the pyrolysis furnace 2, the decarbonization combustion furnace 3 and the oxidation activation furnace 8 are all installed horizontally on the frame 1, and the frame 1 has three layers of supporting spaces arranged vertically opposite each other. The pyrolysis furnace 2, the decarbonization combustion furnace 3 and the oxidation activation furnace 8 are installed one by one in each layer of supporting space, so that the pyrolysis furnace 2, the decarbonization combustion furnace 3 and the oxidation activation furnace 8 are arranged in layers in height, and the overall layout is compact and reasonable, and the occupied ground area is small. The hot blast furnace 5 is erected on one side of the frame 1, and its height matches the height of the three-layer supporting space of the frame 1, which facilitates the connection between the hot blast furnace 5 and the pyrolysis furnace 2, the decarbonization combustion furnace 3 and the oxidation activation furnace 8.

[0025] Among them, Figure 1 , Figure 2 and Figure 6 As shown, the pyrolysis furnace 2 includes an outer cavity 21 and a first furnace body 22. The outer cavity 21 is fixedly arranged, specifically fixed to the uppermost supporting space of the frame 1. The first furnace body 22 passes through the outer cavity 21 and is rotatably and sealedly connected to the outer cavity 21. The outer cavity 21 is used to pass heating gas and heat the first furnace body 22. The first furnace body 22 is used to dry and pyrolyze the solid waste passed in. The discharge end of the first furnace body 22 is gas-connected to the hot blast furnace 5, and is used to pass pyrolysis gas into the hot blast furnace 5.

[0026] For example, the first furnace body 22 may include a first furnace drum, a first furnace head 222 and a first furnace tail 221. The first furnace head 222 and the first furnace tail 221 are fixed on the frame 1. The first furnace drum passes through the outer cavity 21 and is rotatably sealed and connected with the outer cavity 21. The two ends of the first furnace drum are respectively rotatably sealed and connected with the first furnace head 222 and the first furnace tail 221. The outer cavity 21 performs inter-wall heating on the solid waste in the first furnace drum. A feeding screw 10 is provided at the feeding end of the first furnace body 22. The feeding screw 10 passes through the first furnace head 222 and extends into the first furnace drum. The first furnace tail 221 is connected with the first furnace drum. The solid phase and the gas phase are discharged to the first furnace tail 221. The first furnace tail 221 is gaseously connected with the hot blast furnace 5 through the pyrolysis gas pipeline 4. The solid phase in the first furnace tail 221 falls to the feeding end of the decarbonization combustion furnace 3 located below.

[0027] like Figure 1 and Figure 3 As shown, the decarbonization combustion furnace 3 includes a rotatable second furnace body 31, the feed end of the second furnace body 31 is solidly connected with the discharge end of the first furnace body 22, and the solid waste is burned and decarbonized in the second furnace body 31; the discharge end of the second furnace body 31 is gaseously connected with the outer cavity 21 of the pyrolysis furnace 2, and is used to introduce high-temperature flue gas into the outer cavity 21.

[0028] For example, the second furnace body 31 may include a second furnace drum, a second furnace head 311 and a second furnace tail 312. The second furnace head 311 and the second furnace tail 312 are fixed on the second support space of the frame 1. The two ends of the second furnace drum are respectively connected to the second furnace head 311 and the second furnace tail 312 in a rotatable and sealed manner, and the solid waste is burned and decarbonized in the second furnace drum. A feeding screw 10 is provided at the feeding end of the second furnace body 31. The feeding screw 10 passes through the second furnace head 311 and extends into the second furnace drum. The second furnace tail 312 is connected to the second furnace drum. The solid phase and the flue gas generated by the combustion are discharged to the second furnace tail 312. The solid phase in the second furnace tail 312 falls to the feeding end of the oxidation activation furnace 8 located below. The second furnace tail 312 is gas-connected with the outer cavity 21 of the pyrolysis furnace 2 through the second flue gas duct 15, which is used to introduce high-temperature flue gas into the outer cavity 21.

[0029] like Figure 1 and Figure 4 As shown, the oxidation activation furnace 8 includes a rotatable third furnace body 81, the feed end of the third furnace body 81 is solidly connected with the discharge end of the second furnace body 31, and the third furnace body 81 is used for heating, oxidizing and activating solid waste; at least one end of the third furnace body 81 is gaseously connected with the hot blast furnace 5, and is used for introducing high-temperature flue gas into the third furnace body 81. For example, the feed end and the discharge end of the third furnace body 81 can both be gaseously connected with the hot blast furnace 5 through the first flue gas duct 7, so as to realize the introduction of high-temperature flue gas from both ends of the third furnace body 81, so as to realize sufficient oxidation activation of solid waste. Of course, only the feed end or the discharge end can be gaseously connected with the hot blast furnace 5 through the first flue gas duct 7, and the first flue gas duct 7 is provided with a valve 14 for opening and closing; the discharge end of the third furnace body 81 is gaseously connected with the outer cavity 21 of the pyrolysis furnace 2, and is used for introducing high-temperature flue gas into the outer cavity 21.

[0030] For example, the third furnace body 81 may include a third furnace barrel, a third furnace head 811 and a third furnace tail 812. The third furnace head 811 and the third furnace tail 812 are fixed on the lowest support space of the frame 1, and the two ends of the third furnace barrel are respectively rotatably sealed and connected with the third furnace head 811 and the third furnace tail 812. A feeding screw 10 is provided at the feeding end of the third furnace body 81, and the feeding screw 10 passes through the third furnace head 811 and extends into the interior of the third furnace barrel, and is used to transport the solid waste falling from the second furnace tail 312 into the third furnace barrel, and the solid material is oxidized and activated in the third furnace barrel. The third furnace tail 812 is connected with the third furnace barrel, and the solid phase and the generated high-temperature flue gas are discharged to the third furnace tail 812. The third furnace tail 812 is gas-connected with the outer cavity 21 of the pyrolysis furnace 2 through the second flue gas duct 15, and is used to pass high-temperature flue gas into the outer cavity 21, and the solid phase is discharged to the third furnace tail 812, and finally discharged from the third furnace tail 812.

[0031] When the solid waste pyrolysis and activation treatment system is working, solid waste with a certain calorific value is first introduced into the first furnace body 22 of the pyrolysis furnace 2, and the first furnace body 22 is heated by the heating gas in the outer cavity 21, thereby realizing heating of the partition wall of the solid material in the first furnace body 22, so that the solid material is first heated, dried and pyrolyzed in the first furnace body 22 to precipitate water and volatiles, the volatiles in the solid waste are reduced to below 2%, the water content is reduced to below 0.1%, and the temperature of the solid waste itself is heated to above 250°C, reaching a temperature that can self-stable combustion, thereby realizing the enthalpy increase of the solid waste, and the obtained volatiles are introduced into the hot blast furnace 5 as pyrolysis gas for combustion, which serves as the heat reserve of the system, so that the heat of the solid waste is released in an orderly and controllable manner for the first time in the pyrolysis furnace 2. Afterwards, the solid waste with increased enthalpy is passed from the discharge end of the first furnace body 22 into the second furnace body 31 of the decarbonization combustion furnace 3. At this time, the solid waste has reached the temperature of self-stable combustion. Therefore, it is stably burned in the environment of the second furnace body 31 where the moisture and volatile matter content are almost zero. The operation time and speed of the second furnace body 31 can be controlled independently to achieve centralized and sufficient decarbonization of the solid waste. The temperature of the solid material is further increased, completing the second orderly and controllable release of the heat of the solid waste. At the same time, the high-temperature flue gas generated in the second furnace body 31 is passed into the outer cavity 21 of the pyrolysis furnace 2 to heat the wall of the first furnace body 22. Finally, the decarbonized solid waste is passed from the discharge end of the second furnace body 31 into the third furnace body 81 of the oxidation activation furnace 8. At this time, the temperature of the solid waste is not lower than 750°C. On this basis, the high-temperature flue gas generated by the previous pyrolysis gas passing into the hot blast furnace 5 for combustion is passed into the third furnace body 81 to be heated in contact with the solid waste, thereby providing stable heat for the oxidation activation of the solid waste in the third furnace body 81. By individually controlling the operating time and speed of the third furnace body 81, concentrated and sufficient oxidation activation treatment of the solid waste is achieved, so that the obtained product can meet the subsequent process requirements. At the same time, the high-temperature flue gas generated in the third furnace body 81 is passed into the outer cavity 21 of the pyrolysis furnace 2 to heat the first furnace body 22. Compared with the existing solid waste combustion and calcination activation treatment in a large space, which causes the sudden release of the calorific value of the solid waste within a unit volume space and a time period, this system realizes the orderly and controllable release of the calorific value of the solid waste through the pyrolysis furnace 2, the decarbonization combustion furnace 3 and the oxidation activation furnace 8, ensuring the stability and sustainability of the subsequent solid waste when entering the oxidation activation process, making full use of the heat of the pyrolysis gas obtained by the pyrolysis of the solid material and the heat of the high-temperature flue gas generated in the solid material treatment process, thereby improving the utilization rate of its own heat, reducing the consumption of external energy, and reducing the system operation cost.

[0032] It should be noted that during the decarbonization combustion treatment, the solid waste is mixed with oxygen. During the mixing process, the carbon in the material itself undergoes oxidation reaction with oxygen from the surface of the material to the granular material and releases heat. Because the carbon in the granular material wants to mix with oxygen, the oxygen needs to be able to penetrate into the particles in an orderly manner to react with the carbon. This process is relatively slow and requires a suitable reaction environment and reaction time. Oxidation activation treatment also requires a constant temperature environment and sufficient reaction time. The process is similar to the carbon reaction process in the decarbonization combustion treatment. The heat transfer can only be gradually transferred to the inside through the outer wall of the particle. Therefore, it takes a certain amount of time for the activation process to be completed. In addition, there may be a small amount of residual carbon undergoing oxidation reaction during this process, but the heat released by the residual carbon at this stage has not suddenly released heat, and the ambient temperature and supplementary heat keep the activation environment stable in a relatively constant range. If the method in the prior art is used to directly carry out centralized treatment of solid waste in a large space, it will not be possible to meet the requirements of stable combustion decarbonization treatment and stable and continuous oxidation activation treatment. The decarbonization combustion furnace and oxidation activation furnace of the respective corresponding processes in the present application respectively provide different reaction working conditions, release the calorific value of the material in an orderly and controllable manner, and independently control the operating time and speed of the decarbonization combustion furnace and the oxidation activation furnace to achieve stable decarbonization and oxidation activation treatment of solid waste.

[0033] like Figure 1 and Figure 3 As shown, in some embodiments, the feed end of the second furnace body 31 of the decarbonization combustion furnace 3 is gaseously connected to the hot blast furnace 5, and specifically, the second furnace head 311 is gaseously connected to the hot blast furnace 5 through the first flue gas duct 7, so as to introduce high-temperature gas into the second furnace body 31. With such an arrangement, when the calorific value of the residual carbon of the solid waste in the decarbonization combustion furnace 3 cannot meet the requirement of self-stable combustion, the high-temperature flue gas in the hot blast furnace 5 is introduced into the second furnace body 31, and directly contacts with the solid waste to supplement heat, so that the residual carbon in the solid waste is stably burned to achieve decarbonization.

[0034] like Figure 1 and Figure 3 As shown, in some embodiments, the feed end of the second furnace body 31 of the decarbonization combustion furnace 3 is also provided with a first air supplementary combustion channel 6, which is used to introduce air or heating gas into the second furnace body 31. Specifically, the second furnace head 311 is connected with the first air supplementary combustion channel 6, and the first air supplementary combustion channel 6 can introduce air to supplement sufficient oxygen, so that the solid waste in the decarbonization combustion furnace 3 can be fully burned and decarbonized, or, when the calorific value of the residual carbon of the solid waste in the decarbonization combustion furnace 3 cannot meet the self-stable combustion requirement, the first air supplementary combustion channel 6 can be connected with an external burner, and the high-temperature flue gas generated by the combustion of the burner enters the second furnace body 31 through the first air supplementary combustion channel 6, contacts with the solid waste to supplement heat, so that the residual carbon in the solid waste can be stably burned to achieve decarbonization.

[0035] like Figure 1 and Figure 4 As shown, in some embodiments, the feeding end of the third furnace body 81 of the oxidation activation furnace 8 is further provided with a second air supplement and combustion supplement channel 13, which is used to introduce air or heating gas into the third furnace body 81. Specifically, the third furnace head 811 is connected with the second air supplement and combustion supplement channel 13, and the second air supplement and combustion supplement channel 13 can introduce air to supplement sufficient oxygen, so that the solid waste in the oxidation activation furnace 8 can be fully oxidized and activated; when the heat of the high-temperature flue gas provided by the hot blast furnace 5 to the oxidation activation furnace 8 cannot meet the heat required for the oxidation activation of the solid waste in the oxidation activation furnace 8, the second air supplement and combustion supplement channel 13 can be connected with an external burner, and the high-temperature flue gas generated by the combustion of the burner enters the third furnace body 81 through the second air supplement and combustion supplement channel 13, contacts with the solid waste to supplement heat, so that the solid waste is fully oxidized and activated.

[0036] like Figure 1 and Figure 2 As shown, in some embodiments, a plurality of flue gas inlets 212 arranged along the axial direction of the first furnace body 22 are provided at the bottom of the outer cavity 21 of the pyrolysis furnace 2, each flue gas inlet 212 is provided with a control valve 213, each flue gas inlet 212 is connected to the second flue gas duct 15, and the second flue gas duct 15 is gas-connected with the discharge end of the second furnace body 31 and at least one end of the third furnace body 81, so that the high-temperature flue gas generated in the decarbonization combustion furnace 3 and the oxidation activation furnace 8 is passed into each flue gas inlet 212 through the second flue gas duct 15. A plurality of flue gas inlets 212 are arranged in sequence along the axial direction of the outer cavity 21, and the on-off of each corresponding flue gas inlet 212 and the flow rate of the high-temperature flue gas are controlled by controlling the control valve 213, thereby realizing the precise air supply of the high-temperature flue gas, and controlling the temperature of different axial sections in the outer cavity 21, thereby controlling the partition wall heating temperature of the solid waste in the first furnace body 22 of the corresponding axial section. The heating temperature of different axial sections can be controlled according to the working conditions of the solid waste in the first furnace body 22. When it is necessary to increase the heating temperature of a certain axial section, the control valve 213 of the flue gas inlet 212 of the corresponding axial section can be opened and the flow rate of the introduced high-temperature flue gas can be increased. When it is necessary to reduce the heating temperature of a certain axial section, the control valve 213 of the flue gas inlet 212 of the corresponding axial section can be closed, thereby improving the drying efficiency and pyrolysis efficiency of the solid waste.

[0037] For example, each flue gas inlet 212 can be a columnar pipe structure or a traditional flue structure, one end of the flue gas inlet 212 is connected to the second flue gas pipe 15, and the other end extends into the outer cavity 21, so that the high-temperature flue gas enters from the bottom of the outer cavity 21 and rises around the first furnace body 22, so as to make full use of the rising characteristics of the high-temperature flue gas, so that the high-temperature flue gas can fully heat the wall with the corresponding axial section of the first furnace body 22. The number of flue gas inlets 212 can be 2 to 10, specifically 2, 3, 4, 5, 6, 7, 8, 9, 10, and can be arranged at equal intervals along the axial direction, of course, not limited to the number listed in this embodiment, and the appropriate number of flue gas inlets 212 is selected according to the size of the pyrolysis furnace 2 and the heating requirements.

[0038] Furthermore, if Figure 1 and Figure 2 As shown, a smoke outlet 211 is provided at the top of the outer cavity 21, and a valve is provided at the smoke outlet 211. A plurality of smoke outlets 211 can be provided along the feeding direction to the discharging direction of the pyrolysis furnace 2. The main function of the smoke outlet is to open the corresponding position and number of smoke outlets 211 to assist in adjusting the operating temperature of the pyrolysis furnace 2 in an emergency when the smoke inlet 212 at the bottom of the outer cavity 21 cannot control the temperature of the pyrolysis furnace 2.

[0039] like Figure 1 and Figure 3 As shown, in some embodiments, the decarbonization combustion furnace 3 further includes a hollow insulation cover 32, the hollow insulation cover 32 is fixed on the outer wall of the second furnace body 31, and an annular heat-insulating cavity 321 is formed between the hollow insulation cover 32 and the second furnace body 31. Specifically, the hollow insulation cover 32 is fixed on the outer wall of the second furnace barrel, and the hollow insulation cover 32 and the second furnace barrel are a whole and rotate with the second furnace barrel. The heat insulation performance of the second furnace body 31 can be improved by providing the hollow insulation cover 32, and the annular heat-insulating cavity 321 is further formed on the basis of adding insulation material to the outer wall of the second furnace body 31, which can further reduce the impact of ambient temperature and weather conditions on the operation of the equipment, thereby improving the insulation efficiency and reducing the heat loss of the decarbonization combustion furnace 3 during operation.

[0040] like Figure 1 and Figure 4As shown, in some embodiments, the oxidation activation furnace 8 further includes a hollow insulation cover 32, and the hollow insulation cover 32 is fixed on the outer wall of the third furnace body 81, and an annular heat-insulating cavity 321 is formed between the hollow insulation cover 32 and the third furnace body 81. Specifically, the hollow insulation cover 32 is fixed on the outer wall of the third furnace drum, and the hollow insulation cover 32 and the third furnace drum are a whole, rotating with the third furnace drum. The heat insulation performance of the third furnace body 81 can be improved by providing the hollow insulation cover 32, and the annular heat-insulating cavity 321 is further formed on the basis of adding insulation materials to the outer wall of the third furnace body 81, which can further reduce the impact of ambient temperature and weather conditions on the operation of the equipment, thereby improving the insulation efficiency and reducing the heat loss of the oxidation activation furnace 8 during operation.

[0041] like Figure 1-Figure 6 As shown, in some embodiments, the inner walls of the first furnace body 22, the second furnace body 31 and the third furnace body 81 are fixedly provided with a spiral material channel 23 spiraling along the axial direction thereof, so that the solid waste can spirally roll and move in the spiral material channel 23 during the rotation of the first furnace body 22, the second furnace body 31 and the third furnace body 81. Specifically, the spiral material channel 23 is fixedly provided on the inner walls of the first furnace drum, the second furnace drum and the third furnace drum. Taking the first furnace body 22 as an example, when the solid waste is brought to a high place by the first furnace drum during the rotation of the first furnace drum, it rolls down by its own gravity, and under the guiding action of the spiral material channel 23, the material can continuously spirally roll and move from the feed end to the discharge end. The spiral material channel 23 can increase the contact heat exchange area between the first furnace drum and the solid waste, thereby improving the heat exchange efficiency and the heat utilization efficiency.

[0042] like Figure 1 and Figure 2 As shown, in some embodiments, the outer wall of the first furnace body 22 is further provided with an air scoop plate 24, which extends into the outer cavity 21, and is used to evenly distribute the airflow in the outer cavity 21. For example, the air scoop plate 24 can be a rectangular plate, a trapezoidal plate, a triangular plate, etc., one end of which is fixed to the outer wall of the first furnace drum, and the other end extends into the outer cavity 21. The number of the air scoop plates 24 can be multiple, arranged along the axial direction and / or circumferential direction of the first furnace body 22. As the first furnace drum rotates, the air scoop plates 24 move along the circumference, and can stir the heating gas in the outer cavity 21 in an orderly manner, so that the heating gas in the outer cavity 21 dynamically flows around the outer wall of the first furnace drum to the low-pressure area. When the high-temperature flue gas in the outer cavity 21 flows around the first furnace drum, it is ensured that as much heat of the high-temperature flue gas as possible can be transferred to the first furnace drum, thereby improving the heat utilization rate.

[0043] like Figure 1 and Figure 5As shown, in some embodiments, the outer wall of the first furnace body 22 of the pyrolysis furnace 2 is provided with a plurality of hollow bodies 25 arranged in a spiral direction and / or in a circumferential direction. Specifically, the outer wall of the first furnace barrel is provided with a plurality of hollow bodies 25, one end of the hollow body 25 is fixed to the outer wall of the first furnace barrel and communicates with the interior of the first furnace barrel, and can be fixed by welding, riveting, etc., the other end of the hollow body 25 is closed, and the hollow body extends into the outer cavity 21. The hollow body 25 can be a hollow cylinder or a hollow box, etc., and an angle is formed between the axis of the hollow body 25 and the outer wall of the first furnace body 22. Specifically, There is an angle between the axis of the hollow body 25 and the axial direction and / or radial direction of the first furnace body 22, the angle with the axial direction is greater than 0 and less than or equal to 90°, and the angle with the radial direction is greater than or equal to 0 and less than 90°. Specifically, the angle between the axis of the hollow body 25 and the axial direction of the first furnace body 22 can be 10°, 20°, 30°, 40°, 45°, 60°, 70°, 80°, 90°, etc., and the angle between the axis of the hollow body 25 and the radial direction of the first furnace body 22 can be 0°, 10°, 20°, 30°, 40°, 45°, 60°, 70°, 80°, etc. Since there is an angle between the axis of the hollow body 25 and the radial direction of the first furnace body 22, an orderly material lifting effect can be formed inside the first furnace body 22. The inclination direction of the hollow body 25 can make the opening end of the hollow body 25 face the discharge end or the feed end, so as to change the lifting direction of the hollow body 25 according to the process requirements.

[0044] When the pyrolysis furnace 2 is working, as the first furnace body 22 rotates, the solid waste inside it rolls down, and some of the solid waste enters the hollow body 25 in an orderly manner. Since the hollow body 25 extends into the outer cavity 21, the contact heat exchange area between the solid waste and the heating gas in the outer cavity 21 can be increased through the hollow body 25, further improving the heat exchange efficiency and heat utilization rate. At the same time, when the solid waste entering the hollow body 25 reaches a high point, the solid waste will gradually and orderly fall from the hollow body 25, and the hollow body 25 can lift the solid waste into the first furnace body 22 in an orderly manner, so that the lifted solid material is fully in contact with the heat in the first furnace body 22 for heat exchange, thereby improving the heat utilization rate and the drying and pyrolysis effects.

[0045] In other embodiments, the outer wall of the second furnace body 31 of the decarbonization combustion furnace 3 is also provided with a plurality of hollow bodies arranged in a spiral direction and / or arranged in a circumferential direction. Specifically, the outer wall of the second furnace barrel is provided with a plurality of hollow bodies, one end of the hollow body is fixed to the outer wall of the second furnace barrel and connected to the interior of the second furnace barrel, and the other end of the hollow body is closed. When a hollow insulation cover 32 is provided on the outside of the second furnace body 31, the hollow body extends into the annular insulation cavity 321, and an angle is formed between the axis of the hollow body and the outer wall of the second furnace body 31. The form of the angle can be referred to the setting of the hollow body on the first furnace body 22, and will not be repeated.

[0046] When the decarbonization combustion furnace 3 is working, as the second furnace body 31 rotates, the solid waste inside it rolls down, and some solid waste enters the hollow body in an orderly manner. Later, when the solid waste reaches a high place in the hollow body, the solid waste will gradually and orderly fall down from the hollow body. The hollow body can lift the solid waste into the second furnace body 31 in an orderly manner, so that the lifted solid material can be fully contacted with the high-temperature flue gas introduced into the second furnace body 31 or the gas added by the first air and combustion channel 6, thereby improving the heat exchange efficiency, and allowing the solid waste to fully contact with oxygen for combustion, thereby improving the combustion efficiency.

[0047] In some other embodiments, the outer wall of the third furnace body 81 of the oxidation activation furnace 8 is provided with a plurality of hollow bodies arranged in a spiral direction and / or arranged in a circumferential direction. Specifically, the outer wall of the third furnace drum is provided with a plurality of hollow bodies, one end of the hollow body is fixed to the outer wall of the third furnace drum and connected to the interior of the third furnace drum, and the other end of the hollow body is closed. When a hollow insulation cover 32 is provided on the outside of the third furnace body 81, the hollow body extends into the annular insulation cavity 321, and an angle is formed between the axis of the hollow body and the outer wall of the third furnace body 81. The form of the angle can be referred to the setting of the hollow body on the first furnace body 22, and will not be repeated.

[0048] When the oxidation activation furnace 8 is working, as the third furnace body 81 rotates, the solid waste inside it rolls down, and some solid waste enters the hollow body in an orderly manner. Later, when the solid waste reaches a high place in the hollow body, the solid waste will gradually and orderly fall down from the hollow body, and the hollow body can lift the solid waste into the third furnace body 81 in an orderly manner, so that the lifted solid material can be fully contacted with the high-temperature flue gas introduced into the third furnace body 81 or the gas added by the second air and combustion channel 13, thereby improving the heat exchange efficiency, and allowing the solid waste to be fully contacted with oxygen for oxidation activation, thereby improving the oxidation and activation efficiency.

[0049] like Figure 1 and Figure 3 As shown, in some embodiments, a temporary discharge port 11 is provided at the feeding end of the second furnace body 31. Specifically, a temporary discharge port 11 is provided at the bottom of the second furnace head 311, which is opened and closed by a valve. Figure 1 and Figure 4 As shown, a temporary discharge port 11 is provided at the feeding end of the third furnace body 81. Specifically, a temporary discharge port 11 is provided at the bottom of the third furnace head 811, and its opening and closing are controlled by a valve.

[0050] The function of the temporary discharge port 11 is to quickly discharge the solid materials in the system when the decarbonization combustion furnace 3 or the oxidation activation furnace 8 is overheated, or when the decarbonization combustion furnace 3 or the oxidation activation furnace 8 is overloaded due to an operational error, or when the materials processed in the previous process do not need to be processed in the next process, or when orderly shutdown maintenance or emergency repair of equipment in operation is required. The design of the temporary discharge port 11 also increases the versatility of materials processed during the operation of this process, and unsuitable materials can be discharged through the temporary discharge port 11.

[0051] like Figure 1 and Figure 4 As shown, in some embodiments, the feed end of the oxidation activation furnace 8 feeds through a feed screw 10, and a speed reduction and material equalization cover 12 is also provided above the feed port of the feed screw 10, which is used to reduce the speed at which the solid waste discharged from the discharge end of the second furnace body 31 falls into the feed screw 10 and to make the solid waste enter the feed screw 10 evenly. For example, in the third furnace head 811 of the third furnace body 81, a speed reduction and material uniformization cover shell 12 is arranged above the feed port of the feed screw 10. The speed reduction and material uniformization cover shell 12 is an inverted bowl-shaped cover shell as a whole, and the top of the bowl-shaped cover shell is an arc top. In the process of the solid material discharged from the second furnace tail 312 falling into the third furnace head 811, the solid material first falls to the top of the bowl-shaped cover shell, and then slides evenly around along the smooth surface of the bowl-shaped cover shell to the feed port of the feed screw 10. The bowl-shaped cover shell plays a role in buffering and slowing down the falling of the solid material and uniformly dropping the material, so that the solid material can enter the oxidation activation furnace 8 evenly, preventing the solid material from falling into the feed screw 10 in a concentrated manner and causing material blockage. In addition, the top of the speed reduction and material equalization cover 12 is made of high-temperature erosion-resistant material. When the solid material falls to the top of the speed reduction and material equalization cover 12, it can effectively reduce the direct erosion of the high-temperature material coming out of the decarbonization combustion furnace 3 on the feed screw 10, thereby reducing the damage to the feed screw 10, increasing the service life of the feed screw 10, reducing the frequency of maintenance and replacement, and ensuring the continuous and normal operation of the equipment.

[0052] like Figure 1 and Figure 3 As shown, in some embodiments, a lifting plate 33 is further provided in the first furnace body 22, the second furnace body 31 and / or the third furnace body 81, and one end of the lifting plate 33 is fixed to the inner wall of the furnace body, and is used to further lift the solid waste to control the solid waste to fully undergo corresponding process treatment in the furnace body. Multiple lifting plates 33 can be arranged along the axial direction and / or the axial direction to achieve orderly lifting of materials.

[0053] In addition, intermittent material shifting parts, material hooking parts, reverse material stoppers, etc. can be arranged inside the furnace body. Through these components, the process residence time of the solid waste in the furnace body can be comprehensively controlled to stably and fully complete each process.

[0054] like Figure 6 As shown, in some embodiments, a plurality of air supply components 51 are provided on the furnace wall of the hot blast furnace 5. By simulating the movement trajectory of the combustible gas in the hot blast furnace 5, the air supply components 51 are set on the trajectory path of the combustible gas. The air supply volume of the air supply components 51 is adjustable to ensure that the air supply volume can enable the combustible gas to burn fully. The temperature of the high-temperature flue gas in the hot blast furnace can also be adjusted to fluctuate within the range of process requirements by controlling the air supply volume.

[0055] like Figure 1 As shown, in some embodiments, the system further includes an exhaust gas treatment device 9, and the smoke outlet 211 of the outer cavity 21 is connected to the exhaust gas treatment device 9 through a smoke exhaust pipe. All high-temperature smoke of the entire system can enter the outer cavity 21 and be uniformly discharged to the exhaust gas treatment device 9 through the outer cavity 21, so as to simplify the pipeline setting and make full use of the system's own heat. The exhaust gas treatment device 9 can perform environmental protection treatment on the high-temperature smoke before discharging it, reducing pollution to the environment.

[0056] For example, the tail gas treatment device 9 may include a dust removal device, a desulfurization and denitration device, etc. The gas inlet of the desulfurization and denitration device is connected to the flue gas outlet 211 of the outer cavity 21, and the gas outlet of the desulfurization and denitration device is connected to the gas inlet of the dust removal device. In this way, after the high-temperature flue gas is desulfurized and denitrated by the desulfurization and denitration device, it enters the dust removal device for dust removal and is finally discharged. Of course, the tail gas treatment device can select other different treatment devices according to the pollutant components of the high-temperature flue gas, and can only have a desulfurization and denitration device, or only have a dust removal device, etc., and is not limited to the schemes listed in this embodiment.

[0057] Based on the solid waste pyrolysis activation treatment method described in any of the above embodiments, the embodiment of the present invention further provides a solid waste pyrolysis activation treatment method, using the solid waste pyrolysis activation treatment system in any of the above embodiments, the solid waste pyrolysis activation treatment method comprises the following steps: Step 1: introducing solid waste into the first furnace body 22 of the pyrolysis furnace 2, introducing heating gas into the outer cavity 21 of the pyrolysis furnace 2, heating the solid waste through the wall, drying the water, obtaining pyrolysis gas, and introducing the pyrolysis gas into the hot blast furnace 5 for combustion to obtain high-temperature flue gas; Step 2: passing the solid waste heated in the first furnace body 22 into the second furnace body 31 of the decarbonization combustion furnace 3 for decarbonization combustion, and passing the high-temperature flue gas generated in the second furnace body 31 into the outer cavity 21 to participate in the partition wall heating; Step three: pass the solid waste that has undergone decarbonization and combustion in the second furnace body 31 into the third furnace body 81 of the oxidation activation furnace 8 for calcination and oxidation activation. At the same time, pass the high-temperature flue gas from the hot blast furnace 5 into the third furnace body 81 to supplement the heating of the solid waste, and pass the high-temperature flue gas generated in the third furnace body 81 into the outer cavity 21 to participate in the partition wall heating.

[0058] The solid waste pyrolysis activation treatment method utilizes the above system to heat, dry and pyrolyze solid waste with a certain calorific value, precipitate water and volatile matter, reduce the volatile matter in the solid waste to less than 2%, reduce the water content to less than 0.1%, and raise the temperature of the solid waste to more than 250°C, reaching a temperature that can self-stable combustion, and realize the enthalpy increase of the solid waste. The obtained volatile matter is introduced into the hot blast furnace 5 as pyrolysis gas for combustion, and serves as the heat reserve of the system, so that the heat of the solid waste is released in an orderly and controllable manner for the first time in the pyrolysis furnace 2. Afterwards, stable combustion is carried out in an environment where the water and volatile matter content in the decarbonization combustion furnace 3 is almost zero, and the operation time and speed of the decarbonization combustion furnace 3 can be controlled separately to realize the centralized and sufficient decarbonization treatment of the solid waste, and the temperature of the solid material is further increased, completing the second orderly and controllable release of the heat of the solid waste. At the same time, the high-temperature flue gas generated by the decarbonization combustion furnace 3 is introduced into the outer cavity 21 of the pyrolysis furnace 2 to heat the first furnace body 22. Finally, the decarbonized solid waste is passed into the oxidation activation furnace 8. At this time, the temperature of the solid waste is not lower than 750°C. On this basis, the high-temperature flue gas generated by the previous combustion of the pyrolysis gas in the hot blast furnace 5 is passed into the oxidation activation furnace 8 to contact and heat the solid waste, thereby providing stable heat for the oxidation activation of the solid waste in the oxidation activation furnace 8. By individually controlling the operating time and speed of the oxidation activation furnace 8, concentrated and sufficient oxidation activation treatment of the solid waste is achieved, so that the obtained product can meet the subsequent process requirements. At the same time, the high-temperature flue gas generated in the oxidation activation furnace 8 is passed into the outer cavity 21 of the pyrolysis furnace 2 to heat the first furnace body 22. Compared with the existing solid waste combustion and calcination activation treatment in a large space, which causes the sudden release of the calorific value of the solid waste within a unit volume space and a time period, the present method realizes the orderly and controllable release of the calorific value of the solid waste through the pyrolysis furnace 2, the decarbonization combustion furnace 3 and the oxidation activation furnace 8, ensuring the stability and sustainability of the subsequent solid waste when entering the oxidation activation process, making full use of the heat of the pyrolysis gas obtained by the pyrolysis of the solid material and the heat of the high-temperature flue gas generated in the solid material treatment process, thereby improving the utilization rate of its own heat, reducing the consumption of external energy, and reducing the system operation cost.

[0059] In some embodiments, the step 2 of passing the solid waste heated in the first furnace body 22 into the second furnace body 31 of the decarbonization combustion furnace 3 for decarbonization combustion also includes the step of passing the high-temperature flue gas of the hot blast furnace 5 into the second furnace body 31 for supplementary heating. When the calorific value of the residual carbon of the solid waste in the decarbonization combustion furnace 3 cannot meet the requirements of self-stable combustion, the high-temperature flue gas in the hot blast furnace 5 is passed into the second furnace body 31 to directly contact the solid waste to supplement heat, so that the residual carbon in the solid waste can be stably burned to achieve decarbonization.

[0060] In other embodiments, the step 2 of passing the heated solid waste in the first furnace body 22 into the second furnace body 31 of the decarbonization combustion furnace 3 for decarbonization combustion also includes the step of: passing air or heating gas into the second furnace body 31 through the first air supplementary combustion channel 6. The first air supplementary combustion channel 6 can pass air to supplement sufficient oxygen so that the solid waste in the decarbonization combustion furnace 3 can be fully burned and decarbonized, or, when the calorific value of the residual carbon of the solid waste in the decarbonization combustion furnace 3 cannot meet the self-stable combustion requirement, the first air supplementary combustion channel 6 can be connected to an external burner, and the high-temperature flue gas generated by the combustion of the burner enters the second furnace body 31 through the first air supplementary combustion channel 6, contacts with the solid waste to supplement heat, so that the residual carbon in the solid waste can be stably burned to achieve decarbonization.

[0061] In some embodiments, the step three of passing the decarbonized and burned solid waste in the second furnace body 31 into the third furnace body 81 of the oxidation activation furnace 8 for calcination and activation also includes the step of: passing air or heating gas into the third furnace body 81 through the second air supplement and combustion channel 13. The second air supplement and combustion channel 13 can pass air to supplement sufficient oxygen so that the solid waste in the oxidation activation furnace can be fully oxidized and activated; when the heat of the high-temperature flue gas provided by the hot blast furnace 5 to the oxidation activation furnace 8 cannot meet the heat required for the oxidation activation of the solid waste in the oxidation activation furnace, the second air supplement and combustion channel 13 can be connected to an external burner, and the high-temperature flue gas generated by the combustion of the burner enters the third furnace body 81 through the second air supplement and combustion channel 13, contacts with the solid waste to supplement heat, so that the solid waste is fully oxidized and activated.

[0062] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0063] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A solid waste pyrolysis activation treatment system, characterized in that: It comprises a hot air furnace (5) and a pyrolysis furnace (2), a decarbonization combustion furnace (3) and an oxidation activation furnace (8) which are arranged in sequence from top to bottom; The pyrolysis furnace (2) comprises an outer cavity (21) and a first furnace body (22); the first furnace body (22) passes through the outer cavity (21) and is rotatably and hermetically connected to the outer cavity (21); the outer cavity (21) is used to introduce heating gas and heat the first furnace body (22); the first furnace body (22) is used to pyrolyze the introduced solid waste; the discharge end of the first furnace body (22) is in gas communication with the hot blast furnace (5) and is used to introduce pyrolysis gas into the hot blast furnace (5); The decarbonization combustion furnace (3) comprises a rotatable second furnace body (31), the feed end of the second furnace body (31) being solidly connected to the discharge end of the first furnace body (22), and the solid waste is burned and decarbonized in the second furnace body (31); the discharge end of the second furnace body (31) is gaseously connected to the outer cavity (21) for introducing high-temperature flue gas into the outer cavity (21); The oxidation activation furnace (8) comprises a rotatable third furnace body (81), the feed end of the third furnace body (81) being solidly connected to the discharge end of the second furnace body (31), and the third furnace body (81) being used for heating, oxidizing and activating the solid waste; at least one end of the third furnace body (81) being gaseous connected to the hot blast furnace (5) for introducing high-temperature flue gas into the third furnace body (81); and at least one end of the third furnace body (81) being gaseous connected to the outer cavity (21) for introducing high-temperature flue gas into the outer cavity (21).

2. The solid waste pyrolysis activation treatment system according to claim 1, characterized in that: The feed end of the second furnace body (31) is in gas communication with the hot blast furnace (5) and is used for introducing high-temperature gas into the second furnace body (31); And / or, the feed end of the second furnace body (31) is further provided with a first air supplement and combustion supplement channel (6) for introducing air or heating gas into the second furnace body (31); And / or, a second air and combustion supplementary channel (13) is further provided at the feed end of the third furnace body (81) for introducing air or heating gas into the third furnace body (81).

3. The solid waste pyrolysis activation treatment system according to claim 1, characterized in that: The bottom of the outer cavity (21) is provided with a plurality of smoke inlets (212) arranged along the axial direction of the first furnace body (22), each of the smoke inlets (212) is provided with a control valve (213), each of the smoke inlets (212) is connected to a second smoke duct (15), and the second smoke duct (15) is gas-connected with the second furnace body (31) and the third furnace body (81).

4. The solid waste pyrolysis activation treatment system according to claim 1, characterized in that: The decarbonization combustion furnace (3) further comprises a hollow heat-insulating cover (32), wherein the hollow heat-insulating cover (32) is sleeved and fixed on the outer wall of the second furnace body (31), and an annular heat-insulating cavity (321) is formed between the hollow heat-insulating cover (32) and the second furnace body (31); And / or, the oxidation activation furnace (8) further comprises a hollow heat-insulating cover (32), wherein the hollow heat-insulating cover (32) is sleeved on the outer wall of the third furnace body (81), and an annular heat-insulating cavity (321) is formed between the hollow heat-insulating cover (32) and the third furnace body (81).

5. The solid waste pyrolysis activation treatment system according to claim 1, characterized in that: The inner walls of the first furnace body (22), the second furnace body (31) and the third furnace body (81) are all fixedly provided with spiral material channels (23) spiraling along their axial directions, so that the solid waste can spirally roll and move in the spiral material channels (23) during the rotation of the first furnace body (22), the second furnace body (31) and the third furnace body (81); And / or, the outer wall of the first furnace body (22) is further provided with an air collecting plate (24), and the air collecting plate (24) extends into the outer cavity (21) to evenly distribute the airflow in the outer cavity (21).

6. The solid waste pyrolysis activation treatment system according to claim 1, characterized in that: The outer wall of the first furnace body (22) is provided with a plurality of hollow bodies (25) arranged in a spiral direction and / or in a circumferential direction, one end of the hollow body (25) is connected to the interior of the first furnace body (22), the other end of the hollow body (25) is closed, an angle is formed between the axis of the hollow body (25) and the outer wall of the first furnace body (22), and solid waste entering the hollow body (25) can be in contact with the heating gas in the outer cavity (21) for heat exchange and be blown into the first furnace body (22); and / or, the outer wall of the second furnace body (31) is provided with a plurality of hollow bodies (25) arranged in a spiral direction and / or in a circumferential direction, one end of the hollow body (25) is connected to the interior of the second furnace body (31), the other end of the hollow body (25) is closed, an angle is formed between the axis of the hollow body (25) and the outer wall of the second furnace body (31), and the solid waste entering the hollow body (25) can be thrown into the second furnace body (31); And / or, the outer wall of the third furnace body (81) is provided with a plurality of hollow bodies (25) arranged in a spiral direction and / or in a circumferential direction, one end of the hollow body (25) is connected to the interior of the third furnace body (81), and the other end of the hollow body (25) is closed, and an angle is formed between the axis of the hollow body (25) and the outer wall of the third furnace body (81), so that the solid waste entering the hollow body (25) can be thrown into the third furnace body (81).

7. The solid waste pyrolysis activation treatment system according to claim 1, characterized in that: The feeding end of the second furnace body (31) is provided with a temporary discharge port (11); And / or, a temporary discharge port (11) is provided at the feeding end of the third furnace body (81).

8. The solid waste pyrolysis activation treatment system according to claim 1, characterized in that: The feed end of the oxidation activation furnace (8) feeds material via a feed screw (10), and a speed reduction and material equalization cover (12) is also provided above the feed port of the feed screw (10) for reducing the speed at which solid waste discharged from the discharge end of the second furnace body (31) falls into the feed screw (10) and allowing the solid waste to enter the feed screw (10) evenly.

9. A method for pyrolysis and activation of solid waste, characterized in that: Based on the solid waste pyrolysis activation treatment system according to any one of claims 1 to 8, the solid waste pyrolysis activation treatment method comprises: Step 1: passing solid waste into the first furnace body (22) of the pyrolysis furnace (2), passing heating gas into the outer cavity (21) of the pyrolysis furnace (2), heating the solid waste through the wall, drying the water, obtaining pyrolysis gas, and passing the pyrolysis gas into the hot blast furnace (5) for combustion to obtain high-temperature flue gas; Step 2: passing the solid waste heated in the first furnace body (22) into the second furnace body (31) of the decarbonization combustion furnace (3) for decarbonization combustion, and passing the high-temperature flue gas generated in the second furnace body (31) into the outer cavity (21) to participate in the partition wall heating; Step three: the solid waste that has undergone decarbonization and combustion in the second furnace body (31) is passed into the third furnace body (81) of the oxidation activation furnace (8) for calcination and activation. At the same time, the high-temperature flue gas from the hot blast furnace (5) is passed into the third furnace body (81) to supplement the heating of the solid waste, and the high-temperature flue gas generated in the third furnace body (81) is passed into the outer cavity (21) to participate in the heating of the partition wall.

10. The solid waste pyrolysis activation treatment method according to claim 9, characterized in that: The step 2 further comprises: passing the high-temperature flue gas of the hot blast furnace (5) into the second furnace body (31) for supplementary heating; And / or, the step 2 further comprises: introducing air or heating gas into the second furnace body (31) through the first air supplement and combustion supplement channel (6); And / or, the step three further comprises: introducing air or heating gas into the third furnace body (81) through the second air and combustion supplementary channel (13).

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