A solid waste pyrolysis and activation treatment system and method

Abstract

The present invention discloses a solid waste pyrolysis and activation treatment system and method, relating to the field of solid waste treatment. The system includes a hot blast stove and a pyrolysis furnace, a decarbonization combustion furnace and an oxidation activation furnace which are arranged successively from top to bottom; the pyrolysis furnace includes an outer cavity and a first furnace body, the first furnace body passes through the outer cavity and is rotationally and sealingly connected with the outer cavity, and the outer cavity is used for passing heating gas; the first furnace body is used for pyrolyzing solid waste, and the first furnace body is gas-connected with the hot blast stove and is used for passing pyrolysis gas; the decarbonization combustion furnace includes a second furnace body, the feeding end of which is fixedly and gas-connected with the discharging end of the first furnace body, and the solid waste burns and decarbonizes in the second furnace body; the discharging end of the second furnace body is gas-connected with the outer cavity and is used for passing high-temperature flue gas; the oxidation activation furnace includes a third furnace body, the feeding end of which is fixedly and gas-connected with the discharging end of the second furnace body and is used for oxidizing and activating solid waste; the third furnace body is gas-connected with the hot blast stove and is used for passing high-temperature flue gas; the discharging end of the third furnace body is gas-connected with the outer cavity and is used for passing high-temperature flue gas.

Description

Technical Field

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

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

[0003] However, the existing combustion and calcination activation of solid waste are carried out in a large space, resulting in the uncontrollable centralized release of the calorific value of solid waste. The calorific value of the material directly affects the final result of the process, and the obtained products cannot meet the process requirements of fine chemicals. At the same time, the uncontrollable release of calorific value also leads to low utilization rate of the heat of the material itself, high energy consumption, and increased system operation cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a system and method for pyrolysis activation treatment of solid waste to achieve an orderly and controllable release of the calorific value of solid waste, so that the obtained products meet the process requirements, improve the utilization rate of the heat of solid waste itself, reduce energy consumption, and reduce operation costs.

[0005] In a first aspect, the present invention provides a system for pyrolysis activation treatment of solid waste, including a hot blast stove and a pyrolysis furnace, a decarbonization combustion furnace, and an oxidation activation furnace arranged in sequence from top to bottom;

[0006] The pyrolysis furnace includes an outer cavity and a first furnace body. The first furnace body passes through the outer cavity and is rotationally and hermetically connected to 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 gas-connected to the hot blast stove for introducing pyrolysis gas into the hot blast stove;

[0007] The decarbonization combustion furnace includes a rotatable second furnace body. The feed end of the second furnace body is fixedly and gas-connected to the discharge end of the first furnace body. The solid waste burns and decarbonizes in the second furnace body; the discharge end of the second furnace body is gas-connected to the outer cavity for introducing high-temperature flue gas into the outer cavity;

[0008] The oxidation activation furnace includes a rotatable third furnace body. The feeding end of the third furnace body is fixedly communicated with the discharging end of the second furnace body. The third furnace body is used for heating and oxidizing and activating the solid waste. At least one end of the third furnace body is gas-connected to the hot blast stove for introducing high-temperature flue gas into the third furnace body. The discharging end of the third furnace body is gas-connected to the outer cavity for introducing high-temperature flue gas into the outer cavity.

[0009] In some possible implementation manners, the feeding end of the second furnace body is gas-connected to the hot blast stove for introducing high-temperature gas into the second furnace body;

[0010] And / or, a first air supplement and combustion supplement channel is further arranged at the feeding end of the second furnace body for introducing air or heating gas into the second furnace body;

[0011] And / or, a second air supplement and combustion supplement channel is further arranged at the feeding end of the third furnace body for introducing air or heating gas into the third furnace body.

[0012] In some possible implementation manners, a plurality of flue gas inlets arranged along the axial direction of the first furnace body are arranged at the bottom of the outer cavity, and each flue gas inlet is provided with a control valve.

[0013] In some possible implementation manners, the decarbonization combustion furnace further includes a hollow heat preservation cover. The hollow heat preservation cover is sleeved and fixed on the outer wall of the second furnace body, and an annular heat insulation cavity is formed between the hollow heat preservation cover and the second furnace body;

[0014] And / or, the oxidation activation furnace further includes a hollow heat preservation cover. The hollow heat preservation cover is sleeved and fixed on the outer wall of the third furnace body, and an annular heat insulation cavity is formed between the hollow heat preservation cover and the third furnace body.

[0015] In some possible implementation manners, spiral material channels spiraling along the axial direction are fixedly arranged on the inner walls of the first furnace body, the second furnace body and the third furnace body. During the rotation of the first furnace body, the second furnace body and the third furnace body, the solid waste spirally rolls and moves in the spiral material channels;

[0016] And / or, an air pocket plate is further arranged on the outer wall of the first furnace body. The air pocket plate extends into the outer cavity for making the airflow in the outer cavity evenly distributed.

[0017] In some possible implementation manners, a plurality of hollow bodies arranged in a spiral direction and / or in a circumferential direction are provided on an outer wall of the first furnace body. One end of each hollow body is communicated with the inside of the first furnace body, the other end of each hollow body is closed, and an included angle exists between an axis of each hollow body and the outer wall of the first furnace body. The solid waste entering each hollow body can contact and exchange heat with the heating gas in the outer cavity and be lifted into the first furnace body;

[0018] And / or, a plurality of hollow bodies arranged in a spiral direction and / or in a circumferential direction are provided on an outer wall of the second furnace body. One end of each hollow body is communicated with the inside of the second furnace body, the other end of each hollow body is closed, and an included angle exists between an axis of each hollow body and the outer wall of the second furnace body. The solid waste entering each hollow body can be lifted into the second furnace body;

[0019] And / or, a plurality of hollow bodies arranged in a spiral direction and / or in a circumferential direction are provided on an outer wall of the third furnace body. One end of each hollow body is communicated with the inside of the third furnace body, the other end of each hollow body is closed, and an included angle exists between an axis of each hollow body and the outer wall of the third furnace body. The solid waste entering each hollow body can be lifted into the third furnace body.

[0020] In some possible implementation manners, a temporary discharge port is provided at a discharge end of the second furnace body;

[0021] And / or, a temporary discharge port is provided at a discharge end of the third furnace body.

[0022] In some possible implementation manners, the feeding end of the oxidation activation furnace feeds materials through a feeding screw, and a speed reduction and material leveling cover is further provided above a feeding port of the feeding screw for reducing the speed at which the solid waste discharged from the discharge end of the second furnace body falls into the feeding screw and for enabling the solid waste to uniformly enter the feeding screw.

[0023] Compared with the prior art, for the solid waste pyrolysis and activation treatment system provided by the present application, solid waste with a certain calorific value is first introduced into the first furnace body of the pyrolysis furnace, and the first furnace body is heated by the heating gas in the outer cavity, thereby realizing the indirect heating 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, and water and volatile components are precipitated. The volatile content in the solid waste is reduced to less than 2%, the water content is reduced to less than 0.1%, and the self-temperature of the solid waste is raised to more than 250 °C, reaching a temperature at which it can self-ignite stably, realizing the enthalpy increase of the solid waste. The obtained volatile components are introduced into the hot blast stove as pyrolysis gas for combustion, serving 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. Then, the enthalpy-increased solid waste is introduced into the second furnace body of the decarbonization combustion furnace from the discharge end of the first furnace body. At this time, since the solid waste has reached the self-ignition temperature, it burns stably in an environment where the water and volatile content are almost zero in the second furnace body. The operation time and speed of the second furnace body can be controlled separately to achieve centralized and sufficient decarbonization treatment of the solid waste, and the temperature of the solid material further increases, 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 introduced into the outer cavity of the pyrolysis furnace to indirectly heat the first furnace body. Finally, the decarbonized solid waste is introduced into the third furnace body of the oxidation activation furnace from the discharge end of the second furnace body. 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 burning the pyrolysis gas in the hot blast stove before is introduced 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, centralized and sufficient oxidation activation treatment of the solid waste is realized, 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 introduced into the outer cavity of the pyrolysis furnace to indirectly heat the first furnace body. Compared with the prior art in which solid waste is burned and calcined and activated in a large space, this system realizes the orderly and controllable release of the calorific value of solid waste through the pyrolysis furnace, the decarbonization combustion furnace and the oxidation activation furnace, makes full use of the heat of the pyrolysis gas obtained from the pyrolysis of solid materials, as well as the heat of the high-temperature flue gas generated during the solid material treatment process, improves the utilization rate of its own heat, reduces the consumption of external energy, and reduces the system operation cost.

[0024] In a second aspect, the present application also provides a solid waste pyrolysis and activation treatment method. Based on the solid waste pyrolysis and activation treatment system described in any one of the above, the solid waste pyrolysis and activation treatment method includes:

[0025] Step 1: Feed the solid waste into the first furnace body of the pyrolysis furnace, and feed heating gas into the outer cavity of the pyrolysis furnace to conduct indirect heating on the solid waste, dry the moisture to obtain pyrolysis gas, and feed the pyrolysis gas into the hot blast stove to burn to obtain high-temperature flue gas;

[0026] Step 2: Feed the solid waste heated in the first furnace body into the second furnace body of the decarbonization combustion furnace for decarbonization combustion, and feed the high-temperature flue gas generated in the second furnace body into the outer cavity to participate in indirect heating;

[0027] Step 3: Feed the solid waste that has undergone decarbonization combustion in the second furnace body into the third furnace body of the oxidation activation furnace for calcination activation. At the same time, feed the high-temperature flue gas of the hot blast stove into the third furnace body to supplement the heating of the solid waste, and feed the high-temperature flue gas generated in the third furnace body into the outer cavity to participate in indirect heating.

[0028] In some possible implementation manners, Step 2 further includes: feeding the high-temperature flue gas of the hot blast stove into the second furnace body for supplementary heating;

[0029] And / or, Step 2 further includes: feeding air or heating gas into the second furnace body through the first air supply and combustion supplementary channel;

[0030] And / or, Step 3 further includes: feeding air or heating gas into the third furnace body through the second air supply and combustion supplementary channel.

[0031] Compared with the prior art, in the solid waste pyrolysis and activation treatment method in this application, the solid waste pyrolysis and activation treatment system in any one of the above is used. Therefore, it has the same beneficial effects as the system and will not be elaborated. Description of the Drawings

[0032] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0033] Figure 1 It is a schematic structural diagram of a solid waste pyrolysis and activation treatment device provided by an embodiment of the present invention;

[0034] Figure 2 It is Figure 1 the schematic structural diagram of the pyrolysis furnace in

[0035] Figure 3 It is Figure 1 the schematic structural diagram of the decarbonization combustion furnace in

[0036] Figure 4 It is Figure 1Schematic diagram of the structure of the oxidation activation furnace in;

[0037] Figure 5 Schematic diagram of the structure of another pyrolysis furnace provided by an embodiment of the present invention;

[0038] Figure 6 is Figure 1 Schematic diagram of the structure of the hot blast stove in.

[0039] Reference numerals: 1, frame body; 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 pocket plate; 25, hollow body; 3, decarburization combustion furnace; 31, second furnace body; 311, second furnace head; 312, second furnace tail; 32, hollow heat preservation cover; 321, annular heat insulation cavity; 33, material lifting plate; 4, pyrolysis gas pipeline; 5, hot blast stove; 51, air supply component; 6, first air supply and combustion supplementary channel; 7, first flue gas pipeline; 8, oxidation activation furnace; 81, third furnace body; 811, third furnace head; 812, third furnace tail; 9, tail gas treatment device; 10, feeding screw; 11, temporary discharge port; 12, speed reduction and material equalization cover shell; 13, second air supply and combustion supplementary channel; 14, valve; 15, second flue gas pipeline. Detailed implementation manners

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] 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.

[0042] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined. The meaning of "several" is one or more unless otherwise specifically defined.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] As Figures 1-6 shown, an embodiment of the present invention provides a solid waste pyrolysis and activation treatment system, which includes a hot blast stove 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 horizontally installed on the frame 1. The frame 1 has three layers of support spaces arranged vertically and facing each other. The pyrolysis furnace 2, the decarbonization combustion furnace 3, and the oxidation activation furnace 8 are respectively installed in each layer of support space, so that the pyrolysis furnace 2, the decarbonization combustion furnace 3, and the oxidation activation furnace 8 are arranged in layers in height, with a compact and reasonable overall layout and a small floor area occupied. The hot blast stove 5 stands upright on one side of the frame 1, and its height matches the height of the three layers of support spaces of the frame 1, which is convenient for the connection between the hot blast stove 5 and the pyrolysis furnace 2, the decarbonization combustion furnace 3, and the oxidation activation furnace 8.

[0046] Among them, as Figure 1 、 Figure 2 and Figure 6 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 in the support space of the top layer of the frame 1. The first furnace body 22 passes through the outer cavity 21 and is rotationally and sealingly connected to the outer cavity 21. Heating gas is introduced into the outer cavity 21 to heat the first furnace body 22; the first furnace body 22 is used for drying and pyrolyzing the introduced solid waste, and the discharge end of the first furnace body 22 is gas-connected to the hot blast stove 5 to introduce pyrolysis gas into the hot blast stove 5.

[0047] Exemplarily, the first furnace body 22 may include a first furnace cylinder, 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 body 1. The first furnace cylinder passes through the outer cavity 21 and is rotationally and sealingly connected to the outer cavity 21. The two ends of the first furnace cylinder are respectively rotationally and sealingly connected to the first furnace head 222 and the first furnace tail 221. The outer cavity 21 conducts indirect heating on the solid waste in the first furnace cylinder. The feeding end of the first furnace body 22 is provided with a feeding screw 10. The feeding screw 10 passes through the first furnace head 222 and extends into the interior of the first furnace cylinder. The first furnace tail 221 is communicated with the first furnace cylinder. Both the solid phase and the gas phase are discharged to the first furnace tail 221. The first furnace tail 221 is gas-connected to the hot blast stove 5 through a pyrolysis gas pipeline 4. The solid phase in the first furnace tail 221 drops to the feeding end of the decarbonization combustion furnace 3 located below.

[0048] As Figure 1 and Figure 3 shown, the decarbonization combustion furnace 3 includes a rotatable second furnace body 31. The feeding end of the second furnace body 31 is fixedly and communicatively connected to the discharging end of the first furnace body 22. The solid waste burns and decarbonizes in the second furnace body 31. The discharging end of the second furnace body 31 is gas-connected to the outer cavity 21 of the pyrolysis furnace 2 for introducing high-temperature flue gas into the outer cavity 21.

[0049] Exemplarily, the second furnace body 31 may include a second furnace cylinder, 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-layer support space of the frame body 1. The two ends of the second furnace cylinder are respectively rotationally and sealingly connected to the second furnace head 311 and the second furnace tail 312. The solid waste burns and decarbonizes in the second furnace cylinder. The feeding end of the second furnace body 31 is provided with a feeding screw 10. The feeding screw 10 passes through the second furnace head 311 and extends into the interior of the second furnace cylinder. The second furnace tail 312 is communicated with the second furnace cylinder. The solid phase and the flue gas generated by combustion are discharged to the second furnace tail 312. The solid phase in the second furnace tail 312 drops to the feeding end of the oxidation activation furnace 8 located below. The second furnace tail 312 is gas-connected to the outer cavity 21 of the pyrolysis furnace 2 through a second flue gas pipeline 15 for introducing high-temperature flue gas into the outer cavity 21.

[0050] As Figure 1 and Figure 4As shown in the figure, the oxidation activation furnace 8 includes a rotatable third furnace body 81. The feeding end of the third furnace body 81 is fixedly connected and communicated with the discharging end of the second furnace body 31. The third furnace body 81 is used for heating and oxidizing and activating solid waste. At least one end of the third furnace body 81 is gas-connected to the hot blast stove 5 for introducing high-temperature flue gas into the third furnace body 81. For example, both the feeding end and the discharging end of the third furnace body 81 can be gas-connected to the hot blast stove 5 through the first flue gas pipeline 7 to realize the introduction of high-temperature flue gas from both ends of the third furnace body 81, so as to realize the full oxidation and activation of solid waste. Of course, only the feeding end or the discharging end can also be gas-connected to the hot blast stove 5 through the first flue gas pipeline 7, and a valve 14 for opening and closing is arranged on the first flue gas pipeline 7. The discharging end of the third furnace body 81 is gas-connected to the outer cavity 21 of the pyrolysis furnace 2 for introducing high-temperature flue gas into the outer cavity 21.

[0051] Exemplarily, 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-layer support space of the frame body 1. The two ends of the third furnace barrel are respectively rotationally and hermetically connected to the third furnace head 811 and the third furnace tail 812. A feeding screw 10 is arranged at the feeding end of the third furnace body 81. The feeding screw 10 passes through the third furnace head 811 and extends into the third furnace barrel to convey the solid waste falling from the second furnace tail 312 into the third furnace barrel. The solid material is oxidized and activated in the third furnace barrel. The third furnace tail 812 is communicated with the third furnace barrel. The solid phase and the generated high-temperature flue gas are both discharged to the third furnace tail 812. The third furnace tail 812 is gas-connected to the outer cavity 21 of the pyrolysis furnace 2 through the second flue gas pipeline 15 for introducing high-temperature flue gas into the outer cavity 21. The solid phase is discharged to the third furnace tail 812 and finally discharged from the third furnace tail 812.

[0052] When the solid waste pyrolysis and activation treatment system is working, solid waste with a certain calorific value is first fed into the first furnace body 22 of the pyrolysis furnace 2. The first furnace body 22 is heated by the heating gas in the outer cavity 21, thereby realizing the indirect heating 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, and moisture and volatile components are precipitated. The volatile content in the solid waste is reduced to less than 2%, the moisture is reduced to less than 0.1%, and the self-temperature of the solid waste rises to more than 250 °C, reaching a temperature at which it can self-stably burn, realizing the enthalpy increase of the solid waste. The obtained volatile components are fed into the hot blast stove 5 as pyrolysis gas for combustion, serving 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. After that, the enthalpy-increased solid waste is fed into the second furnace body 31 of the decarbonization combustion furnace 3 from the discharge end of the first furnace body 22. At this time, since the solid waste has reached the self-stable combustion temperature, it stably burns in the environment where the moisture and volatile content are almost zero in the second furnace body 31. The operation time and speed of the second furnace body 31 can be controlled separately to realize the centralized and sufficient decarbonization treatment of the solid waste, and the temperature of the solid material further rises, 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 fed into the outer cavity 21 of the pyrolysis furnace 2 to indirectly heat the first furnace body 22. Finally, the decarbonized solid waste is fed into the third furnace body 81 of the oxidation activation furnace 8 from the discharge end of the second furnace body 31. 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 combustion of the previous pyrolysis gas in the hot blast stove 5 is fed into the third furnace body 81 to contact and heat the solid waste, providing stable heat for the oxidation activation of the solid waste in the third furnace body 81. By controlling the operation time and speed of the third furnace body 81 separately, the centralized and sufficient oxidation activation treatment of the solid waste is realized, 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 fed into the outer cavity 21 of the pyrolysis furnace 2 to indirectly heat the first furnace body 22. Compared with the existing combustion and calcination activation treatment of solid waste in a large space, which causes the sudden release of the calorific value of solid waste in the unit volume space and time period, this system realizes the orderly and controllable release of the calorific value of 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 from the pyrolysis of solid materials and the heat of the high-temperature flue gas generated during 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.

[0053] It should be noted that during decarbonization combustion treatment, solid waste is mixed with oxygen. During the mixing process, the carbon in the material itself reacts with oxygen from the surface of the material into the granular material and releases heat. Since the carbon in the granular material needs to mix with oxygen, oxygen needs to penetrate into the granules orderly to react with carbon, and 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 decarbonization combustion treatment. The heat transfer can only be gradually transferred from the outer wall of the granules to the inside, so 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 in this process, but the heat released by the residual carbon at this stage no longer has a sudden heat release, and the environmental temperature and supplementary heat keep the activation environment stable within a relatively constant range. If the existing technology is used to directly carry out centralized treatment of solid waste in a large space, it cannot meet the requirements of stable combustion decarbonization treatment and stable and continuous oxidation activation treatment. However, by providing different reaction working condition environments through the decarbonization combustion furnace and the oxidation activation furnace corresponding to the respective processes in this application, the calorific value of the material is released in an orderly and controllable manner. By independently controlling the operation time and speed of the decarbonization combustion furnace and the oxidation activation furnace, stable decarbonization and oxidation activation treatment of solid waste are achieved.

[0054] As Figure 1 and Figure 3 shown, in some embodiments, the feeding end of the second furnace body 31 of the decarbonization combustion furnace 3 is gas-connected to the hot blast stove 5. Specifically, the second furnace head 311 is gas-connected to the hot blast stove 5 through the first flue gas pipeline 7 for introducing high-temperature gas into the second furnace body 31. With such a setting, 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 high-temperature flue gas in the hot blast stove 5 is introduced into the second furnace body 31 to directly contact the solid waste to supplement heat, so that the residual carbon in the solid waste burns stably to achieve decarbonization.

[0055] As Figure 1 and Figure 3 shown, in some embodiments, a first air supply and combustion supplement channel 6 is further provided at the feeding end of the second furnace body 31 of the decarbonization combustion furnace 3 for introducing air or heating gas into the second furnace body 31. Specifically, the second furnace head 311 is connected to the first air supply and combustion supplement channel 6, and the first air supply and combustion supplement channel 6 can introduce air to supplement sufficient oxygen, so that the solid waste in the decarbonization combustion furnace 3 can burn sufficiently to achieve decarbonization. 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 supply and combustion supplement 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 supply and combustion supplement channel 6 to contact the solid waste to supplement heat, so that the residual carbon in the solid waste burns stably to achieve decarbonization.

[0056] As Figure 1 and Figure 4 shown, in some embodiments, a second air supplement and combustion supplement channel 13 is further provided at the feeding end of the third furnace body 81 of the oxidation activation furnace 8 for introducing air or heating gas into the third furnace body 81. Specifically, the third furnace head 811 is communicated 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 stove 5 to the oxidation activation furnace 8 cannot meet the heat required for the oxidation and activation of the solid waste in the oxidation activation furnace 8, the second air supplement and combustion supplement channel 13 can be communicated 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 and contacts the solid waste to supplement heat, so that the solid waste can be fully oxidized and activated.

[0057] As Figure 1 and Figure 2 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. A control valve 213 is provided at each flue gas inlet 212, and each flue gas inlet 212 is communicated with the second flue gas pipeline 15. The second flue gas pipeline 15 is gas-connected with at least one end of the discharging end of the second furnace body 31 and 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 introduced into each flue gas inlet 212 through the second flue gas pipeline 15. The 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 the control valve 213, realizing the precise air supply of the high-temperature flue gas. The temperature of different axial segments in the outer cavity 21 can be controlled, and further the indirect heating temperature of the solid waste in the first furnace body 22 corresponding to the axial segment can be controlled. The heating temperature of different axial segments 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 segment, the control valve 213 of the flue gas inlet 212 corresponding to the axial segment can be opened and the flow rate of the introduced high-temperature flue gas can be increased. When it is necessary to decrease the heating temperature of a certain axial segment, the control valve 213 of the flue gas inlet 212 corresponding to the axial segment can be closed, so as to improve the drying efficiency and pyrolysis efficiency of the solid waste.

[0058] Exemplarily, each flue gas inlet 212 can be a columnar pipe structure, a traditional flue structure, etc. One end of the flue gas inlet 212 communicates with the second flue gas pipe 15, and the other end extends into the outer cavity 21, so that the high-temperature flue gas is introduced from the bottom of the outer cavity 21 and rises around the first furnace body 22 to make full use of the characteristic of the rising high-temperature flue gas, so that the high-temperature flue gas can fully perform wall heating with the corresponding shaft section of the first furnace body 22. The number of the flue gas inlets 212 can be 2 to 10, specifically 2, 3, 4, 5, 6, 7, 8, 9, 10, and they can be arranged at equal intervals along the axis. Of course, it is not limited to the number listed in this embodiment, and the appropriate number of flue gas inlets 212 is selected according to the size and heating requirements of the pyrolysis furnace 2.

[0059] Further, as Figure 1 and Figure 2 shown, a flue gas outlet 211 is provided at the top of the outer cavity 21. A valve is provided at the flue gas outlet 211. Multiple flue gas outlets 211 can be arranged along the feeding direction to the discharging direction of the pyrolysis furnace 2. The main function of the flue gas outlet is to open the flue gas outlets 211 at the corresponding positions and in the corresponding quantity when the flue gas inlets 212 at the bottom of the outer cavity 21 cannot control the temperature of the pyrolysis furnace 2 in an emergency, so as to assist in adjusting the operating temperature of the pyrolysis furnace 2.

[0060] As Figure 1 and Figure 3 shown, in some embodiments, the decarbonization combustion furnace 3 further includes a hollow heat preservation cover 32. The hollow heat preservation cover 32 is sleeved and fixed on the outer wall of the second furnace body 31. An annular heat insulation cavity 321 is formed between the hollow heat preservation cover 32 and the second furnace body 31. Specifically, the hollow heat preservation cover 32 is sleeved and fixed on the outer wall of the second furnace barrel. The hollow heat preservation cover 32 and the second furnace barrel are taken as a whole and rotate together with the second furnace barrel. By providing the hollow heat preservation cover 32, the heat insulation performance of the second furnace body 31 can be improved. On the basis of adding heat preservation materials to the outer wall of the second furnace body 31, the annular heat insulation cavity 321 is further formed, which can further reduce the influence of the ambient temperature and weather conditions on the operation of the equipment, thereby improving the heat preservation efficiency and reducing the heat loss of the decarbonization combustion furnace 3 during operation.

[0061] As Figure 1 and Figure 4As shown, in some embodiments, the oxidation activation furnace 8 further includes a hollow heat insulation cover 32. The hollow heat insulation cover 32 is fixedly sleeved on the outer wall of the third furnace body 81, and an annular heat insulation cavity 321 is formed between the hollow heat insulation cover 32 and the third furnace body 81. Specifically, the hollow heat insulation cover 32 is fixedly sleeved on the outer wall of the third furnace cylinder. The hollow heat insulation cover 32 and the third furnace cylinder are taken as a whole and rotate together with the third furnace cylinder. By providing the hollow heat insulation cover 32, the heat insulation performance of the third furnace body 81 can be improved. On the basis of adding heat insulation materials to the outer wall of the third furnace body 81, the annular heat insulation cavity 321 is further formed, which can further reduce the influence of the ambient temperature and weather conditions on the operation of the equipment, thereby improving the heat insulation efficiency and reducing the heat loss of the oxidation activation furnace 8 during operation.

[0062] As Figures 1-6 shown, in some embodiments, spiral material channels 23 spiraling along the axial direction are fixedly arranged on the inner walls of the first furnace body 22, the second furnace body 31, and the third furnace body 81, for the solid waste to spiral and 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. Specifically, the spiral material channels 23 are fixedly arranged on the inner walls of the first furnace cylinder, the second furnace cylinder, and the third furnace cylinder. Taking the first furnace body 22 as an example, when the first furnace cylinder rotates, when the solid waste is carried to a high place by the first furnace cylinder, it rolls down by its own gravity. Under the guiding action of the spiral material channel 23, the material realizes continuous spiral rolling and moving from the feeding end to the discharging end. Through the spiral material channel 23, the contact heat exchange area between the first furnace cylinder and the solid waste can be increased, thereby improving the heat exchange efficiency and the heat utilization efficiency.

[0063] As Figure 1 and Figure 2 shown, in some embodiments, an air pocket plate 24 is further arranged on the outer wall of the first furnace body 22. The air pocket plate 24 extends into the outer cavity 21 for making the air flow in the outer cavity 21 evenly distributed. Exemplarily, the air pocket plate 24 can be a rectangular plate, a trapezoidal plate, a triangular plate, etc. One end is fixed to the outer wall of the first furnace cylinder, and the other end extends into the outer cavity 21. The number of the air pocket plates 24 can be multiple, arranged along the axial direction and / or the circumferential direction of the first furnace body 22. As the first furnace cylinder rotates, the air pocket plate 24 moves along the circumference accordingly, and can orderly stir the heating gas in the outer cavity 21, so that the heating gas in the outer cavity 21 flows around the outer wall of the first furnace cylinder towards the low-pressure area dynamically. When the high-temperature flue gas in the outer cavity 21 flows around the first furnace cylinder, it is ensured that as much heat of the high-temperature flue gas as possible can be transferred into the first furnace cylinder, thereby improving the heat utilization rate.

[0064] As Figure 1 and Figure 5As shown, in some embodiments, a plurality of hollow bodies 25 are arranged on the outer wall of the first furnace body 22 of the pyrolysis furnace 2 in a spiral direction and / or in a circumferential direction. Specifically, a plurality of hollow bodies 25 are arranged on the outer wall of the first furnace cylinder. One end of the hollow body 25 is fixed to the outer wall of the first furnace cylinder and is in communication with the inside of the first furnace cylinder. Specifically, it can be fixed by welding, riveting or other means. The other end of the hollow body 25 is closed. The hollow body extends into the outer cavity 21. The hollow body 25 can be a hollow cylinder, a hollow box or the like. There is an angle 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 the 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 inclined direction of the hollow body 25 can make the open end of the hollow body 25 face the discharge end or the feed end, so as to change the material lifting direction of the hollow body 25 according to process requirements.

[0065] When the pyrolysis furnace 2 works, as the first furnace body 22 rotates, the solid waste inside it rolls down. Some solid waste enters the hollow body 25 orderly. 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 position, the solid waste will gradually and orderly fall from the hollow body 25. The hollow body 25 can lift the solid waste into the first furnace body 22 orderly, so that the lifted solid material is in full contact with the heat in the first furnace body 22 for heat exchange, improving the heat utilization rate and the drying and pyrolysis effects.

[0066] In some other embodiments, a plurality of hollow bodies are also arranged on the outer wall of the second furnace body 31 of the decarbonization combustion furnace 3 in a spiral direction and / or in a circumferential direction. Specifically, a plurality of hollow bodies are arranged on the outer wall of the second furnace cylinder. One end of the hollow body is fixed to the outer wall of the second furnace cylinder and is in communication with the inside of the second furnace cylinder. The other end of the hollow body is closed. When a hollow heat preservation cover 32 is arranged outside the second furnace body 31, the hollow body extends into the annular heat insulation cavity 321. There is an angle between the axis of the hollow body and the outer wall of the second furnace body 31. The form of the angle can refer to the setting of the hollow body on the first furnace body 22 and will not be elaborated here.

[0067] When the decarbonization combustion furnace 3 is operating, as the second furnace body 31 rotates, the solid waste inside it rolls down. Some solid waste enters the hollow body in an orderly manner. After that, when the hollow body reaches a high position, the solid waste gradually and orderly falls from the hollow body. The hollow body can orderly lift the solid waste into the second furnace body 31, enabling the lifted solid material to come into full contact with the high-temperature flue gas introduced into the second furnace body 31 or the gas supplemented by the first air supply and combustion supplementary channel 6, improving the heat exchange efficiency, and enabling the solid waste to come into full contact with oxygen for combustion, improving the combustion efficiency.

[0068] In some other embodiments, a plurality of hollow bodies are arranged on the outer wall of the third furnace body 81 of the oxidation activation furnace 8 in a spiral arrangement and / or in a circumferential arrangement. Specifically, a plurality of hollow bodies are arranged on the outer wall of the third furnace barrel. One end of the hollow body is fixed to the outer wall of the third furnace barrel and communicates with the inside of the third furnace barrel. The other end of the hollow body is closed. When a hollow heat preservation cover 32 is arranged outside the third furnace body 81, the hollow body extends into the annular heat insulation cavity 321. An included angle exists between the axis of the hollow body and the outer wall of the third furnace body 81. The form of the included angle can refer to the arrangement of the hollow body on the first furnace body 22 and will not be elaborated here.

[0069] When the oxidation activation furnace 8 is operating, as the third furnace body 81 rotates, the solid waste inside it rolls down. Some solid waste enters the hollow body in an orderly manner. After that, when the hollow body reaches a high position, the solid waste gradually and orderly falls from the hollow body. The hollow body can orderly lift the solid waste into the third furnace body 81, enabling the lifted solid material to come into full contact with the high-temperature flue gas introduced into the third furnace body 81 or the gas supplemented by the second air supply and combustion supplementary channel 13, improving the heat exchange efficiency, and enabling the solid waste to come into full contact with oxygen for oxidation activation, improving the oxidation and activation efficiency.

[0070] As Figure 1 and Figure 3 shown, in some embodiments, a temporary discharge port 11 is arranged at the feeding end of the second furnace body 31. Specifically, a temporary discharge port 11 is opened at the bottom of the second furnace head 311, and its opening and closing are controlled by a valve. As Figure 1 and Figure 4 shown, a temporary discharge port 11 is arranged at the feeding end of the third furnace body 81. Specifically, a temporary discharge port 11 is opened at the bottom of the third furnace head 811, and its opening and closing are controlled by a valve.

[0071] 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 runs over-temperature abnormally, or when the decarbonization combustion furnace 3 or the oxidation activation furnace 8 is overloaded during operation due to operational errors, or when the materials processed in the previous process do not need to be processed in the next process, or when orderly shutdown for maintenance or emergency repair of equipment during operation is required, etc. The design of the temporary discharge port 11 also increases the generality of material processing during the operation of this process, and inappropriate materials can be discharged through the temporary discharge port 11.

[0072] As Figure 1 and Figure 4 shown, in some embodiments, the feeding end of the oxidation activation furnace 8 is fed through the feeding screw 10, and a speed-reducing and material-uniforming housing 12 is further arranged above the feeding port of the feeding screw 10, which is used to reduce the speed at which the solid waste discharged from the discharging end of the second furnace body 31 falls into the feeding screw 10 and to make the solid waste enter the feeding screw 10 evenly. Exemplarily, in the third furnace head 811 of the third furnace body 81, a speed-reducing and material-uniforming housing 12 is arranged above the feeding port of the feeding screw 10. The speed-reducing and material-uniforming housing 12 is an inverted bowl-shaped housing as a whole, and the top of the bowl-shaped housing is an arc top. When the solid materials discharged from the second furnace tail 312 fall into the third furnace head 811, the solid materials first fall onto the top of the bowl-shaped housing, and then slide evenly around along the smooth surface of the bowl-shaped housing into the feeding port of the feeding screw 10. The bowl-shaped housing plays a role in buffering and reducing the speed of the falling solid materials and evenly feeding the materials, so that the solid materials enter the oxidation activation furnace 8 evenly, preventing the solid materials from concentrating and falling into the feeding screw 10 and causing material blockage. In addition, the top of the speed-reducing and material-uniforming housing 12 is made of high-temperature erosion-resistant material. When the solid materials fall onto the top of the speed-reducing and material-uniforming housing 12, it can effectively reduce the direct erosion of the high-temperature materials coming out of the decarbonization combustion furnace 3 on the feeding screw 10, thereby reducing the damage to the feeding screw 10, increasing the service life of the feeding screw 10, reducing the frequency of maintenance and replacement, and ensuring the continuous and normal operation of the equipment.

[0073] As Figure 1 and Figure 3 shown, in some embodiments, a material-lifting plate 33 is further arranged in the first furnace body 22, the second furnace body 31 and / or the third furnace body 81. One end of the material-lifting plate 33 is fixed on the inner wall of the furnace body, which is used to further lift the solid waste to control the solid waste to fully carry out the corresponding process treatment in the furnace body. A plurality of material-lifting plates 33 can be arranged along the axial direction and / or the axial direction to achieve orderly material lifting.

[0074] In addition, an intermittent material-feeding member, a material-hooking member, a reverse material-blocking device, 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 realized to stably and fully complete their respective processes.

[0075] As Figure 6 shown, in some embodiments, a plurality of air supply components 51 are provided on the furnace wall of the hot blast stove 5. By simulating the movement trajectory of the combustible gas in the hot blast stove 5, the air supply components 51 are set on the combustible gas trajectory path, and the air supply volume of the air supply components 51 is adjustable to ensure that the air supply volume can enable the full combustion of the combustible gas, and the temperature of the high-temperature flue gas in the hot blast stove can also be controlled and adjusted to fluctuate within the range of process requirements by adjusting the air supply volume.

[0076] As Figure 1 shown, in some embodiments, the system further includes a tail gas treatment device 9. The flue gas outlet 211 of the outer cavity 21 is communicated with the tail gas treatment device 9 through a flue gas discharge pipe. All the high-temperature flue gas of the whole system can enter the outer cavity 21 and then be uniformly discharged to the tail gas treatment device 9 through the outer cavity 21, so as to simplify the pipeline arrangement and make full use of the heat of the system itself. The tail gas treatment device 9 can perform environmental protection treatment on the high-temperature flue gas and then discharge it to reduce environmental pollution.

[0077] Exemplarily, the tail gas treatment device 9 may include a dust removal device, a desulfurization and denitrification device, etc. The gas inlet of the desulfurization and denitrification device is communicated with the flue gas outlet 211 of the outer cavity 21, and the gas outlet of the desulfurization and denitrification device is communicated with the gas inlet of the dust removal device. In this way, after the high-temperature flue gas is subjected to desulfurization and denitrification treatment by the desulfurization and denitrification device, it enters the dust removal device for dust removal treatment and finally is discharged. Of course, the tail gas treatment device can select other different treatment devices according to the pollution components of the high-temperature flue gas. It can have only a desulfurization and denitrification device or only a dust removal device, etc., and is not limited to the scheme listed in this embodiment.

[0078] Based on the solid waste pyrolysis and activation treatment method described in any of the above embodiments, the embodiment of the present invention further provides a solid waste pyrolysis and activation treatment method, which applies the solid waste pyrolysis and activation treatment system in any of the above embodiments. The solid waste pyrolysis and activation treatment method includes the following steps:

[0079] Step 1: Feed the solid waste into the first furnace body 22 of the pyrolysis furnace 2, feed the heating gas into the outer cavity 21 of the pyrolysis furnace 2, perform indirect heating on the solid waste to dry the moisture, obtain pyrolysis gas, and feed the pyrolysis gas into the hot blast stove 5 for combustion to obtain high-temperature flue gas;

[0080] Step 2: Feed 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 feed the high-temperature flue gas generated in the second furnace body 31 into the outer cavity 21 to participate in indirect heating;

[0081] Step 3: Feed the solid waste that has undergone decarburization 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, feed the high-temperature flue gas from the hot blast stove 5 into the third furnace body 81 to supplement the heating of the solid waste, and feed the high-temperature flue gas generated in the third furnace body 81 into the outer cavity 21 to participate in the wall heating.

[0082] This method for pyrolysis and activation treatment of solid waste uses the above system to first heat and dry the solid waste with a certain calorific value and then pyrolyze it to release moisture and volatile components. The volatile content in the solid waste is reduced to less than 2%, the moisture content is reduced to less than 0.1%, and the self-temperature of the solid waste rises to above 250 °C, reaching a temperature at which it can stably burn by itself, realizing the enthalpy increase of the solid waste. The obtained volatile components are fed into the hot blast stove 5 for combustion as pyrolysis gas, serving as the heat reserve of the system, enabling the heat of the solid waste to be released in an orderly and controllable manner for the first time in the pyrolysis furnace 2. Subsequently, stable combustion is carried out in the decarburization combustion furnace 3 in an environment where the moisture and volatile content are almost zero. The operation time and speed of the decarburization combustion furnace 3 can be controlled separately to achieve centralized and sufficient decarburization treatment of the solid waste, further increasing the temperature of the solid material and 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 decarburization combustion furnace 3 is fed into the outer cavity 21 of the pyrolysis furnace 2 to conduct wall heating on the first furnace body 22. Finally, the decarburized solid waste is fed 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 burning the previous pyrolysis gas in the hot blast stove 5 is fed into the oxidation activation furnace 8 to contact and heat the solid waste, providing stable heat for the oxidation activation of the solid waste in the oxidation activation furnace 8. By separately controlling the operation time and speed of the oxidation activation furnace 8, centralized and sufficient oxidation activation treatment of the solid waste is achieved, enabling the obtained product to meet the subsequent process requirements. At the same time, the high-temperature flue gas generated in the oxidation activation furnace 8 is fed into the outer cavity 21 of the pyrolysis furnace 2 to conduct wall heating on the first furnace body 22. Compared with the existing method of burning and calcining and activating solid waste in a large space, which causes a sudden release of the calorific value of the solid waste in the unit volume space and time period, this method realizes the orderly and controllable release of the calorific value of the solid waste through the pyrolysis furnace 2, the decarburization 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 from the pyrolysis of the solid material and the heat of the high-temperature flue gas generated during the solid material treatment process, improving the utilization rate of its own heat, reducing the consumption of external energy, and lowering the system operation cost.

[0083] In some embodiments, in the step of feeding 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 in step two, the following steps are further included: feeding the high-temperature flue gas of the hot blast stove 5 into the second furnace body 31 for supplementary heating. When the residual carbon calorific value of the solid waste in the decarbonization combustion furnace 3 cannot meet the self-stable combustion requirement, the high-temperature flue gas in the hot blast stove 5 is fed into the second furnace body 31 to directly contact the solid waste to supplement heat, so that the residual carbon in the solid waste burns stably to achieve decarbonization.

[0084] In some other embodiments, in the step of feeding 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 in step two, the following steps are further included: feeding air or heating gas into the second furnace body 31 through the first air supply and combustion supplementary channel 6. The first air supply and combustion supplementary channel 6 can feed air to supplement sufficient oxygen, so that the solid waste in the decarbonization combustion furnace 3 can burn and decarbonize sufficiently. Or, when the residual carbon calorific value of the solid waste in the decarbonization combustion furnace 3 cannot meet the self-stable combustion requirement, the first air supply and combustion supplementary 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 supply and combustion supplementary channel 6 to contact the solid waste to supplement heat, so that the residual carbon in the solid waste burns stably to achieve decarbonization.

[0085] In some embodiments, in the step of feeding the solid waste that has undergone decarbonization combustion in the second furnace body 31 into the third furnace body 81 of the oxidation activation furnace 8 for calcination and activation in step three, the following steps are further included: feeding air or heating gas into the third furnace body 81 through the second air supply and combustion supplementary channel 13. The second air supply and combustion supplementary channel 13 can feed air to supplement sufficient oxygen, so that the solid waste in the oxidation activation furnace can be oxidized and activated sufficiently; when the heat of the high-temperature flue gas provided by the hot blast stove 5 to the oxidation activation furnace 8 cannot meet the heat required for the oxidation and activation of the solid waste in the oxidation activation furnace, the second air supply and combustion supplementary 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 supply and combustion supplementary channel 13 to contact the solid waste to supplement heat, so that the solid waste can be oxidized and activated sufficiently.

[0086] In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0087] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A solid waste pyrolysis and activation treatment system, characterized in that, It includes a hot blast stove (5), a pyrolysis furnace (2), a decarbonization combustion furnace (3), and an oxidation activation furnace (8) arranged in sequence from top to bottom; The pyrolysis furnace (2) includes an outer cavity (21) and a first furnace body (22). The first furnace body (22) passes through the outer cavity (21) and is rotationally and sealingly 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 gas-connected to the hot blast stove (5) for introducing pyrolysis gas into the hot blast stove (5); The decarbonization combustion furnace (3) includes a rotatable second furnace body (31). The feed end of the second furnace body (31) is fixedly and gas-connected to the discharge end of the first furnace body (22). The solid waste undergoes stable combustion and decarbonization in an environment where the moisture and volatile content are almost zero in the second furnace body (31). The discharge end of the second furnace body (31) is gas-connected to the outer cavity (21) for introducing high-temperature flue gas into the outer cavity (21); The oxidation activation furnace (8) includes a rotatable third furnace body (81). The feed end of the third furnace body (81) is fixedly and gas-connected to the discharge end of the second furnace body (31). The third furnace body (81) is used to heat and oxidize and activate the solid waste. At least one end of the third furnace body (81) is gas-connected to the hot blast stove (5) for introducing high-temperature flue gas into the third furnace body (81). At least one end of the third furnace body (81) is gas-connected to the outer cavity (21) for introducing high-temperature flue gas into the outer cavity (21); A plurality of hollow bodies (25) arranged in a spiral direction and / or circumferentially are provided on the outer wall of the first furnace body (22). One end of the hollow body (25) is connected to the inside of the first furnace body (22), and the other end of the hollow body (25) is closed. The hollow body (25) extends into the outer cavity (21). An included angle exists between the axis of the hollow body (25) and the outer wall of the first furnace body (22). The solid waste entering the hollow body (25) can contact and exchange heat with the heating gas in the outer cavity (21) and be lifted into the first furnace body (22).

2. The pyrolysis activation treatment system for solid waste according to claim 1, wherein The feed end of the second furnace body (31) is gas-connected to the hot blast stove (5) for introducing high-temperature gas into the second furnace body (31); And / or, a first air supply and combustion supplement channel (6) is further provided at the feed end of the second furnace body (31) for introducing air or heating gas into the second furnace body (31); And / or, a second air supply and combustion supplement 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 and activation treatment system according to claim 1, wherein 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). A control valve (213) is provided at each flue gas inlet (212). Each flue gas inlet (212) is communicated with a second flue gas pipeline (15), and the second flue gas pipeline (15) is communicated with the second furnace body (31) and the third furnace body (81) in gas connection.

4. The pyrolysis activation treatment system for solid waste according to claim 1, wherein, The decarbonization combustion furnace (3) further includes a hollow heat preservation cover (32). The hollow heat preservation cover (32) is fixedly sleeved on the outer wall of the second furnace body (31), and an annular heat insulation cavity (321) is formed between the hollow heat preservation cover (32) and the second furnace body (31). And / or, the oxidation activation furnace (8) further includes a hollow heat preservation cover (32). The hollow heat preservation cover (32) is fixedly sleeved on the outer wall of the third furnace body (81), and an annular heat insulation cavity (321) is formed between the hollow heat preservation cover (32) and the third furnace body (81).

5. The pyrolysis activation treatment system for solid waste according to claim 1, wherein, Spiral material channels (23) spiraling along their axial directions are fixedly provided on the inner walls of the first furnace body (22), the second furnace body (31) and the third furnace body (81), so that during the rotation of the first furnace body (22), the second furnace body (31) and the third furnace body (81), the solid waste spirally rolls and moves in the spiral material channels (23). And / or, an air pocket plate (24) is further provided on the outer wall of the first furnace body (22). The air pocket plate (24) extends into the outer cavity (21) to make the air flow in the outer cavity (21) evenly distributed.

6. The pyrolysis activation treatment system for solid waste according to claim 1, characterized in that, A plurality of hollow bodies (25) arranged along the spiral direction and / or circumferentially are provided on the outer wall of the second furnace body (31). One end of the hollow body (25) is communicated with the inside of the second furnace body (31), and the other end of the hollow body (25) is closed. An included 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 lifted into the second furnace body (31). And / or, a plurality of hollow bodies (25) arranged along the spiral direction and / or circumferentially are provided on the outer wall of the third furnace body (81). One end of the hollow body (25) is communicated with the inside of the third furnace body (81), and the other end of the hollow body (25) is closed. An included angle is formed between the axis of the hollow body (25) and the outer wall of the third furnace body (81), and the solid waste entering the hollow body (25) can be lifted into the third furnace body (81).

7. The pyrolysis and activation treatment system for solid waste according to claim 1, wherein A temporary discharge port (11) is provided at the feeding end of the second furnace body (31). And / or, a temporary discharge port (11) is provided at the feeding end of the third furnace body (81).

8. The pyrolysis and activation treatment system for solid waste according to claim 1, wherein, The feeding end of the oxidation activation furnace (8) is fed through a feeding screw (10), and a speed reduction and material leveling housing (12) is further arranged above the feeding port of the feeding screw (10) for reducing the speed at which the solid waste discharged from the discharging end of the second furnace body (31) falls into the feeding screw (10) and for enabling the solid waste to enter the feeding screw (10) evenly.

9. A method for pyrolytic activation treatment of solid waste, characterized in that, Based on the solid waste pyrolysis and activation treatment system according to any one of claims 1-8, the solid waste pyrolysis and activation treatment method comprises: Step 1: Feeding the solid waste into the first furnace body (22) of the pyrolysis furnace (2), feeding a heating gas into the outer cavity (21) of the pyrolysis furnace (2), performing indirect heating on the solid waste to dry the moisture, obtaining pyrolysis gas, and feeding the pyrolysis gas into the hot blast stove (5) to be burned to obtain high-temperature flue gas; Step 2: Feeding 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 feeding the high-temperature flue gas generated in the second furnace body (31) into the outer cavity (21) to participate in indirect heating; Step 3: Feeding the solid waste that has undergone decarbonization combustion in the second furnace body (31) into the third furnace body (81) of the oxidation activation furnace (8) for calcination and activation. Meanwhile, feeding the high-temperature flue gas of the hot blast stove (5) into the third furnace body (81) to perform supplementary heating on the solid waste, and feeding the high-temperature flue gas generated in the third furnace body (81) into the outer cavity (21) to participate in indirect heating.

10. The method for pyrolytic activation treatment of solid waste according to claim 9, characterized in that, The said Step 2 further comprises: feeding the high-temperature flue gas of the hot blast stove (5) into the second furnace body (31) for supplementary heating; and / or, the said Step 2 further comprises: feeding air or a heating gas into the second furnace body (31) through a first air supply and combustion supplementary channel (6); and / or, the said Step 3 further comprises: feeding air or a heating gas into the third furnace body (81) through a second air supply and combustion supplementary channel (13).

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