System for treating domestic waste

Abstract

The present invention discloses a system for treating domestic waste, comprising: a drying device having an inlet for domestic waste, a flue gas inlet, an outlet for dried domestic waste, and an outlet for heat-exchanged flue gas; a pyrolysis device including: a pyrolysis chamber provided with an inlet for dried domestic waste, a pyrolysis carbon outlet, and a pyrolysis gas outlet; a heating chamber nested with the pyrolysis chamber and arranged on the periphery of the pyrolysis chamber, having a high-temperature flue gas inlet and a flue gas outlet after heating, and the flue gas outlet after heating is connected to the flue gas inlet; a combustion device having a combustion member, a comb-shaped combustion air distribution duct, and a high-temperature flue gas outlet, the combustion member including a nested igniter, a pyrolysis gas inlet, and a pyrolysis gas combustion air inlet, the pyrolysis gas inlet is connected to the pyrolysis gas outlet through a multi-section connected pipeline, the pipeline includes a first horizontal pipeline, a second horizontal pipeline, and an inclined pipeline connecting the first horizontal pipeline and the second horizontal pipeline, and an ash outlet is provided at the connection of the inclined pipeline and the second horizontal pipeline.

Description

Technical Field

[0001] The present invention belongs to the technical field of domestic waste treatment. Specifically, the present invention relates to a system for treating domestic waste. Background Art

[0002] The pyrolysis of domestic waste is a reaction process in which macromolecular organic substances in it undergo chemical bond cleavage, isomerization, and polymerization of small-molecular organic substances through heating means under anaerobic conditions, and finally macromolecular organic substances are converted into small-molecular gas fuels (CH 4 , CO, H 2 etc.), liquid fuels (organic acids, aromatic hydrocarbons, tar), and activated coke (biochar, slag). At present, the process of the domestic waste pyrolysis system generally sets up a drying furnace and a pyrolysis furnace, and the gas generated by pyrolysis is not recycled in the system; the pyrolysis furnace burns fuels such as diesel, and the combustion in the furnace is incomplete due to insufficient air distribution, resulting in black smoke in the tail gas; the temperature in the pyrolyzer is unstable and the hot air mixing is uneven, resulting in poor pyrolysis effect.

[0003] Therefore, the existing technologies for treating domestic waste need to be further improved. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related technologies to some extent. For this purpose, an object of the present invention is to provide a system for treating domestic waste. This system realizes the effective utilization of pyrolysis gas, and can ensure the complete combustion of pyrolysis gas, stable and balanced temperature in the pyrolysis chamber, and improve the pyrolysis effect.

[0005] In one aspect of the present invention, the present invention provides a system for treating domestic waste. According to an embodiment of the present invention, the system includes:

[0006] A drying device, which has a domestic waste inlet, a flue gas inlet, a dried domestic waste outlet, and a heat-exchanged flue gas outlet;

[0007] A pyrolysis device, which includes:

[0008] A pyrolysis chamber, both end faces of which are respectively provided with a dried domestic waste inlet and a pyrolysis carbon outlet. The dried domestic waste inlet is connected to the dried domestic waste outlet, and a pyrolysis gas outlet is also provided on the end face where the dried domestic waste inlet is located;

[0009] A heating chamber, which is nested with the pyrolysis chamber and is arranged outside the pyrolysis chamber. The heating chamber has a high-temperature flue gas inlet and a heated flue gas outlet, and the heated flue gas outlet is connected to the flue gas inlet;

[0010] Combustion device, the combustion device having a combustion member, a comb-shaped combustion air distribution duct, and a high-temperature flue gas outlet. The combustion member includes an igniter, a pyrolysis gas inlet, and a pyrolysis gas combustion air inlet nestedly arranged. The pyrolysis gas inlet is arranged around the igniter, and the pyrolysis gas combustion air inlet is arranged on the periphery of the pyrolysis gas inlet. The pyrolysis gas inlet is connected to the pyrolysis gas outlet through a plurality of connected pipes. The pipes include a first horizontal pipe connected to the pyrolysis gas outlet, a second horizontal pipe connected to the pyrolysis gas inlet, and an inclined pipe connecting the first horizontal pipe and the second horizontal pipe. And an ash outlet is provided at the connection of the inclined pipe and the second horizontal pipe. The high-temperature flue gas outlet is connected to the high-temperature flue gas inlet.

[0011] For the system for treating domestic waste according to the embodiment of the present invention, by sending the pyrolysis gas generated in the pyrolysis chamber to the combustion member in the combustion device through a plurality of connected pipes, it is beneficial to achieve the complete combustion of the pyrolysis gas. Since the pipes include a first horizontal pipe connected to the pyrolysis gas outlet, a second horizontal pipe connected to the pyrolysis gas inlet, and an inclined pipe connecting the first horizontal pipe and the second horizontal pipe, and an ash outlet is provided at the connection of the inclined pipe and the second horizontal pipe, solid impurities such as ash in the pyrolysis gas discharged from the pyrolysis chamber can be discharged, thereby improving the reuse effect of the pyrolysis gas; the combustion member includes an igniter, a pyrolysis gas inlet, and a pyrolysis gas combustion air inlet nestedly arranged. The pyrolysis gas inlet is arranged around the igniter, and the pyrolysis gas combustion air inlet is arranged on the periphery of the pyrolysis gas inlet. This structure can significantly improve the combustion efficiency of the pyrolysis gas; further, the comb-shaped combustion air distribution duct provided in the combustion device can further improve the combustion efficiency of the pyrolysis gas and ensure the full combustion of the pyrolysis gas in the combustion device; the high-temperature flue gas obtained from the combustion device is sent to the heat supply chamber. Since the heat supply chamber and the pyrolysis chamber are nestedly arranged, the heat of the high-temperature flue gas is transferred to the pyrolysis chamber through heat transfer. The dried domestic waste sent to the pyrolysis chamber undergoes pyrolysis under the action of this heat to obtain pyrolysis gas and pyrolysis carbon; after the high-temperature flue gas in the heat supply chamber undergoes heat transfer with the pyrolysis chamber, the heat-supplied flue gas is obtained. This heat-supplied flue gas can be sent to the drying device as a heat source for drying domestic waste to further improve the thermal utilization rate of the system.

[0012] In addition, the system for treating domestic waste according to the above embodiment of the present invention may further have the following additional technical features:

[0013] In some embodiments of the present invention, the high-temperature flue gas outlets are provided at both the top and the side of the combustion device, and the high-temperature flue gas inlets are provided on both sides of the heat supply chamber on the same horizontal plane. The high-temperature flue gas outlets located at the top and the side of the combustion device are respectively connected to the high-temperature flue gas inlets located on both sides of the heat supply chamber.

[0014] In some embodiments of the present invention, on both sides of the high-temperature flue gas outlet at the top of the combustion device, there are mirror-image arranged comb-shaped heat-exchanged flue gas distribution air ducts, the comb-shaped heat-exchanged flue gas distribution air ducts are connected to the heat-exchanged flue gas outlet, and a heat-exchanged flue gas fan is provided in the comb-shaped heat-exchanged flue gas distribution air ducts.

[0015] In some embodiments of the present invention, the comb-shaped combustion-supporting air distribution air ducts are symmetrically arranged on both sides of the combustion device.

[0016] In some embodiments of the present invention, the combustion device is provided with a pyrolysis gas auxiliary burner, and the heat supply chamber is provided with an auxiliary burner.

[0017] In some embodiments of the present invention, a heat tracing member and a vibrating member are provided on the inclined pipeline.

[0018] In some embodiments of the present invention, on the pipeline connecting the heat-supplied flue gas outlet and the flue gas inlet, there are provided a heat-supplied flue gas control valve and a temperature-pressure-combustion efficiency detection member, and the heat-supplied flue gas control valve is connected to the temperature-pressure-combustion efficiency detection member.

[0019] In some embodiments of the present invention, the heat supply chamber is provided with a heat supply temperature-pressure detection member, and the heat supply temperature-pressure detection member is connected to the pyrolysis gas auxiliary burner, the auxiliary burner, and the heat-exchanged flue gas fan.

[0020] In some embodiments of the present invention, the comb-shaped combustion-supporting air distribution air duct is connected to a combustion-supporting air fan, and the combustion-supporting air fan is connected to the temperature-pressure-combustion efficiency detection member.

[0021] In some embodiments of the present invention, heat-supplied flue gas outlets are respectively provided in the heat supply chamber near the dried domestic waste inlet and near the pyrolytic carbon outlet, and the heat-supplied flue gas control valve is arranged on the pipeline connecting the heat-supplied flue gas outlet near the pyrolytic carbon outlet and the flue gas inlet, and the temperature-pressure-combustion efficiency detection member is arranged on the pipeline that gathers all the heat-supplied flue gas from the heat-supplied flue gas outlets.

[0022] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. Brief Description of the Drawings

[0023] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0024] Figure 1 is a schematic structural diagram of a system for treating domestic waste according to an embodiment of the present invention;

[0025] Figure 2 is Figure 1 a partial side view of Detailed Embodiments

[0026] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. 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.

[0030] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0031] In one aspect of the present invention, the present invention provides a system for treating domestic waste. According to an embodiment of the present invention, with reference to Figure 1-2 , the system includes: a drying device 100, a pyrolysis device 200 and a combustion device 300.

[0032] According to an embodiment of the present invention, the drying device 100 has a domestic waste inlet 101, a flue gas inlet 102, a dried domestic waste outlet 103 and a heat-exchanged flue gas outlet 104, and is adapted to dry domestic waste with flue gas to obtain dried domestic waste and heat-exchanged flue gas. It should be noted that the domestic waste and the flue gas are in direct heat exchange. Thus, the drying device may be a drying device with an overall rotating structure. For example, the drying device may be cylindrical, and the cylinder may rotate along the horizontal central axis. Another example is that a rotating bed may be provided inside the drying device. The domestic waste enters the rotating bed from the domestic waste inlet, and the rotating bed rotates inside the drying device and directly exchanges heat with the flue gas. Further, the domestic waste may be sent to the drying device through a domestic waste feeding screw to facilitate the control of the feeding rate. Further, the water content of the dried domestic waste is not particularly limited. For example, it may be 10-30 wt%, which is beneficial to improving the pyrolysis efficiency of the dried domestic waste in the pyrolysis chamber and can also prevent the domestic waste from staying in the drying device for too long and improve the system efficiency. Further, the temperature of the flue gas does not exceed 300 °C, which can not only achieve the drying treatment of domestic waste but also prevent the domestic waste from pyrolyzing in the drying device at too high a temperature.

[0033] According to an embodiment of the present invention, the pyrolysis device 200 includes: a pyrolysis chamber 210 and a heat supply chamber 220.

[0034] According to an embodiment of the present invention, at both end faces of the pyrolysis chamber 210, there are respectively provided an inlet 211 for dried domestic waste and a pyrolysis carbon outlet 212. The inlet 211 for dried domestic waste is connected to the outlet 103 of dried domestic waste. And on the end face provided with the inlet 211 for dried domestic waste, there is further provided a pyrolysis gas outlet 213, and it is adapted to pyrolyze the dried domestic waste so as to obtain pyrolysis carbon and pyrolysis gas. According to a specific embodiment of the present invention, the inlet 211 for dried domestic waste can be connected to the outlet 103 of dried domestic waste through a feeding screw, so as to automatically send the dried domestic waste obtained by the drying device to the pyrolysis chamber, improve the process continuity of the system, and facilitate the control of the feeding rate. According to still another specific embodiment of the present invention, the pyrolysis carbon can be discharged from the pyrolysis chamber 210 through a discharging screw, so as to further improve the continuity of the system and at the same time realize the control of the discharging rate. According to yet another specific embodiment of the present invention, a temperature-pressure detection member 21 for the pyrolysis chamber can be arranged in the pyrolysis chamber 210 to detect the temperature and pressure conditions in the pyrolysis chamber in real time, and the pyrolysis situation in the pyrolysis chamber can be known therefrom. According to yet another specific embodiment of the present invention, the pyrolysis chamber 210 can be an overall rotating structure, and the dried domestic waste is slowly sent from the inlet for dried domestic waste to the pyrolysis carbon outlet along with the rotation of the pyrolysis chamber and is pyrolyzed during the moving process.

[0035] According to another embodiment of the present invention, the heating chamber 220 is nested with the pyrolysis chamber 210, and the heating chamber 220 is arranged on the periphery of the pyrolysis chamber 210. The heating chamber 220 has a high-temperature flue gas inlet 221 and a flue gas outlet 222 after heating. The flue gas outlet 222 after heating is connected to the flue gas inlet 102 and is adapted to indirectly heat the pyrolysis chamber with high-temperature flue gas, so as to obtain the flue gas after heating and send the flue gas after heating to the drying device for use as a heat source. The inventor found that the nested heating chamber and pyrolysis chamber facilitate the high-temperature flue gas in the heating chamber to provide heat for the pyrolysis chamber, and are beneficial to recovering the heat of the flue gas after heating, improving the thermal utilization rate of the system, and improving the pyrolysis efficiency. According to a specific embodiment of the present invention, a heating temperature-pressure detection member 22 is provided in the heating chamber 220 to detect the temperature and pressure in the heating chamber. According to another specific embodiment of the present invention, an auxiliary burner 23 is provided in the heating chamber, and the auxiliary burner 23 is connected to the above-mentioned heating temperature-pressure detection member 22. When the heating temperature-pressure detection member shows that the temperature in the heating chamber is too low, the auxiliary burner can be turned on for heating so that the temperature in the heating chamber reaches the specified requirement. According to another specific embodiment of the present invention, the temperature of the heating chamber can be 600-800 °C. Thus, it is beneficial to improve the pyrolysis efficiency in the pyrolysis chamber and also beneficial to reduce energy consumption. Further, the specific type of fuel used by the auxiliary burner 23 is not particularly limited, such as it can be at least one of diesel, liquefied petroleum gas, and natural gas. According to another specific embodiment of the present invention, a flue gas control valve 24 after heating and a temperature-pressure-combustion efficiency detection member 25 are provided on the pipeline connecting the flue gas outlet 222 after heating and the flue gas inlet 102. The flue gas control valve 24 after heating is connected to the temperature-pressure-combustion efficiency detection member 25 and is adapted to control the amount of flue gas sent to the drying device, monitor the temperature and pressure of the flue gas after heating, and at the same time, by detecting the content ratio of oxygen to carbon monoxide in the flue gas after heating, the combustion efficiency of the pyrolysis gas or the total combustion efficiency of the pyrolysis gas and the auxiliary fuel can be reflected. The auxiliary fuel referred to here includes the auxiliary fuel in the pyrolysis gas auxiliary burner in the combustion device and / or the auxiliary fuel in the auxiliary burner in the heating chamber. Further, by connecting the flue gas control valve after heating to the temperature-pressure-combustion efficiency detection member, when the temperature-pressure-combustion efficiency detection member detects that the temperature of the flue gas after heating is too high, such as exceeding 300 °C, the opening of the flue gas control valve after heating can be adjusted to reduce the amount of the flue gas after heating entering the drying device. Further, the flue gas after heating can be sent to the drying device 100 through a pipeline, or flue gas outlets 222 after heating can be respectively provided in the heating chamber 220 near the dried domestic waste inlet 211 and near the pyrolysis carbon outlet 212. The flue gas control valve 24 after heating is arranged on the pipeline connecting the flue gas outlet 222 after heating near the pyrolysis carbon outlet 212 and the flue gas inlet 102, while the temperature-pressure-combustion efficiency detection member 25 is arranged on the pipeline that gathers all the flue gas after heating from the flue gas outlets 222 after heating.That is, the flue gas after heat supply can be led out from the front and rear ends of the heat supply chamber respectively, which is beneficial to improving the efficiency of sending the flue gas after heat supply to the drying device. It can also improve the detection accuracy of the temperature and pressure of the flue gas after heat supply sent to the drying device by the temperature-pressure-combustion efficiency detection component, and enhance the detection accuracy of the pyrolysis gas combustion efficiency or the total fuel efficiency of the pyrolysis gas and the auxiliary fuel in the system.

[0036] According to an embodiment of the present invention, the combustion device 300 has a combustion component 31, a comb-shaped combustion air distribution duct 32, and a high-temperature flue gas outlet 301. The combustion component 31 includes an igniter 311, a pyrolysis gas inlet 312, and a pyrolysis gas combustion air inlet 313 which are nested. The pyrolysis gas inlet 312 is arranged around the igniter 311, and the pyrolysis gas combustion air inlet 313 is arranged on the periphery of the pyrolysis gas inlet 312. The pyrolysis gas inlet 312 is connected to the pyrolysis gas outlet 213 through a multi-section connected pipeline. The pipeline includes a first horizontal pipeline 331 connected to the pyrolysis gas outlet 213, a second horizontal pipeline 332 connected to the pyrolysis gas inlet 312, and an inclined pipeline 333 connecting the first horizontal pipeline 331 and the second horizontal pipeline 332. And an ash outlet 302 is provided at the connection of the inclined pipeline 333 and the second horizontal pipeline 332. The high-temperature flue gas outlet 301 is connected to the high-temperature flue gas inlet 221, and is adapted to send the pyrolysis gas generated in the pyrolysis chamber to the combustion device after dust removal, and fully burn under the action of the pyrolysis gas combustion air from the pyrolysis gas combustion air inlet and the comb-shaped combustion air distribution duct, so as to obtain high-temperature flue gas, and the obtained high-temperature flue gas is sent to the heat supply chamber for use as a heat source. The inventor found that by sending the pyrolysis gas generated in the pyrolysis chamber to the combustion component in the combustion device through a multi-section connected pipeline, it is beneficial to realize the complete combustion of the pyrolysis gas. Since the pipeline includes a first horizontal pipeline connected to the pyrolysis gas outlet, a second horizontal pipeline connected to the pyrolysis gas inlet, and an inclined pipeline connecting the first horizontal pipeline and the second horizontal pipeline, and an ash outlet is provided at the connection of the inclined pipeline and the second horizontal pipeline, solid impurities such as ash in the pyrolysis gas discharged from the pyrolysis chamber can be discharged, and thus the reuse effect of the pyrolysis gas can be improved; the combustion component includes an igniter, a pyrolysis gas inlet, and a pyrolysis gas combustion air inlet which are nested. The pyrolysis gas inlet is arranged around the igniter, and the pyrolysis gas combustion air inlet is arranged on the periphery of the pyrolysis gas inlet. This structure can significantly improve the combustion efficiency of the pyrolysis gas; further, a pyrolysis gas temperature-pressure detection component (not shown) can be provided on the first horizontal pipeline 331 to monitor the temperature and pressure of the pyrolysis gas discharged from the pyrolysis gas outlet.

[0037] According to an embodiment of the present invention, high-temperature flue gas outlets 301 are provided at both the top and sides of the combustion device 300, and high-temperature flue gas inlets 221 are provided on both sides of the heating chamber 220 on the same horizontal plane. The high-temperature flue gas outlets 301 at the top and sides of the combustion device 300 are respectively connected to the high-temperature flue gas inlets 221 on both sides of the heating chamber 220, and are adapted to symmetrically input high-temperature flue gas from the top and sides of the combustion device to both sides of the heating chamber. The inventor found that by providing high-temperature flue gas inlets on both sides of the heating chamber on the same horizontal plane, it is beneficial to improve the uniformity of the temperature distribution in the heating chamber, and thus improve the pyrolysis efficiency in the pyrolysis chamber.

[0038] According to still another embodiment of the present invention, comb-shaped heat-exchanged flue gas distribution ducts 34 are arranged in a mirror image on both sides of the high-temperature flue gas outlet 301 at the top of the combustion device 300. The comb-shaped heat-exchanged flue gas distribution ducts 34 are connected to the heat-exchanged flue gas outlet 104, and a heat-exchanged flue gas fan 35 is provided in the comb-shaped heat-exchanged flue gas distribution ducts 34, and is adapted to send the heat-exchanged flue gas generated by the drying device from both sides of the high-temperature flue gas outlet at the top of the combustion device to the combustion device under the power action of the heat-exchanged flue gas fan. The inventor found that by sending the heat-exchanged flue gas generated by the drying device back to the combustion device for reuse, it is beneficial to reduce the temperature of the high-temperature flue gas output from the combustion device. When the temperature in the heating chamber is too high, the frequency of the heat-exchanged flue gas fan can be increased to increase the amount of heat-exchanged flue gas reused to the combustion device, thereby achieving rapid cooling. And by arranging the comb-shaped heat-exchanged flue gas distribution ducts in a mirror image on both sides of the high-temperature flue gas outlet, the above cooling effect can be made more efficient. Further, the heat-exchanged flue gas fan 35 can be connected to a heating temperature-pressure detector 22 (not shown). Thus, when the heating temperature-pressure detector detects that the temperature in the heating chamber is too high, such as exceeding 800 °C, the frequency of the heat-exchanged flue gas fan can be automatically increased to accelerate the cooling of the high-temperature flue gas. Further, a plurality of high-temperature flue gas outlets can be provided at the top of the combustion device. At this time, the heating chamber is also provided with a plurality of high-temperature flue gas inlets in one-to-one correspondence, and valves can be respectively provided on the pipelines connecting each high-temperature flue gas outlet and the high-temperature flue gas inlet to control whether to send high-temperature flue gas to the heating chamber through this pipeline, or to adjust the flow rate of the high-temperature flue gas sent to the heating chamber through this pipeline.

[0039] According to another embodiment of the present invention, the comb-shaped combustion air distribution duct 32 can be symmetrically arranged on both sides of the combustion device 300. Thus, the combustion of pyrolysis gas in the combustion device can be further promoted to be sufficient. Further, the combustion device 300 can also be provided with a pyrolysis gas auxiliary burner 36. Thus, when the temperature of the heat supply chamber is too low, the pyrolysis gas auxiliary burner and / or the auxiliary burner of the heat supply chamber can be turned on to increase the heat, so as to ensure the pyrolysis efficiency of the domestic waste after drying in the pyrolysis chamber. Further, the pyrolysis gas auxiliary burner 36 can be connected to the heat supply temperature-pressure detection member 22 (not shown). Thus, when the heat supply temperature-pressure detection member detects that the temperature of the heat supply chamber is too low, the pyrolysis gas auxiliary burner can be turned on to increase the temperature of the high-temperature flue gas. Further, the comb-shaped combustion air distribution duct 32 can be connected to the combustion air blower 39, and the combustion air blower 39 is connected to the temperature-pressure-combustion efficiency detection member 25 (not shown). When the temperature-pressure-combustion efficiency detection member feeds back that the oxygen content in the flue gas after heat supply is low or the carbon monoxide content is high, that is, the pyrolysis gas or the pyrolysis gas and the pyrolysis gas auxiliary fuel and / or the auxiliary fuel sent into the combustion device are not completely burned, the frequency of the combustion air blower can be increased to increase the oxygen concentration in the combustion device, so as to ensure that the pyrolysis gas or the pyrolysis gas and the pyrolysis gas auxiliary fuel and / or the auxiliary fuel can be completely burned. Further, a plurality of comb-shaped combustion air distribution ducts can be included, and a combustion air blower can supply combustion air to the plurality of comb-shaped combustion air distribution ducts.

[0040] According to another embodiment of the present invention, a heat tracing member 37 and a vibrating member 38 are provided on the inclined pipe 332. The inventor found that by providing a heat tracing member on the inclined pipe, heat can be provided for the inclined pipe, avoiding the precipitation of substances such as tar due to temperature drop during the process of sending the pyrolysis gas from the pyrolysis gas outlet to the combustion member for combustion, avoiding pipe blockage. At the same time, by providing a vibrating member on the inclined pipe, the accumulation of solid impurities on the inner wall of the pipe can be avoided, and the pipe blockage can be further avoided, avoiding adverse effects on the reuse of pyrolysis gas.

[0041] The system for treating domestic waste according to the embodiments of the present invention sends the pyrolysis gas generated in the pyrolysis chamber to the combustion element in the combustion device through a multi-section connected pipeline, which is conducive to achieving the complete combustion of the pyrolysis gas. Since the pipeline includes a first horizontal pipeline connected to the pyrolysis gas outlet, a second horizontal pipeline connected to the pyrolysis gas inlet, and an inclined pipeline connecting the first horizontal pipeline and the second horizontal pipeline, and an ash outlet is provided at the connection of the inclined pipeline and the second horizontal pipeline, solid impurities such as ash in the pyrolysis gas discharged from the pyrolysis chamber can be discharged, thereby improving the reuse effect of the pyrolysis gas; the combustion element includes a nested ignition device, a pyrolysis gas inlet, and a pyrolysis gas combustion-supporting air inlet. The pyrolysis gas inlet is arranged around the ignition device, and the pyrolysis gas combustion-supporting air inlet is arranged on the periphery of the pyrolysis gas inlet. This structure can significantly improve the combustion efficiency of the pyrolysis gas; further, the toothed comb-shaped combustion-supporting air distribution duct arranged in the combustion device can further improve the combustion efficiency of the pyrolysis gas and ensure the full combustion of the pyrolysis gas in the combustion device; the high-temperature flue gas obtained from the combustion device is sent to the heat supply chamber. Since the heat supply chamber and the pyrolysis chamber are nested, the heat of the high-temperature flue gas is transferred to the pyrolysis chamber through heat transfer. The dried domestic waste sent to the pyrolysis chamber undergoes pyrolysis under the action of this heat to obtain pyrolysis gas and pyrolysis carbon; after the high-temperature flue gas in the heat supply chamber undergoes heat transfer with the pyrolysis chamber, the heat-supplied flue gas can be sent to the drying device as the heat source for drying domestic waste to further improve the thermal utilization rate of the system.

[0042] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0043] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A system for treating domestic waste, characterized in that, comprising: A drying device, which has an inlet for domestic waste, a flue gas inlet, an outlet for dried domestic waste, and an outlet for heat-exchanged flue gas; A pyrolysis device, which includes: A pyrolysis chamber, with an inlet for dried domestic waste and an outlet for pyrolysis carbon provided at both end faces of the pyrolysis chamber. The inlet for dried domestic waste is connected to the outlet for dried domestic waste, and a pyrolysis gas outlet is also provided on the end face where the inlet for dried domestic waste is located; A heating chamber, which is nested with the pyrolysis chamber and is arranged outside the pyrolysis chamber. The heating chamber has a high-temperature flue gas inlet and an outlet for heated flue gas, and the outlet for heated flue gas is connected to the flue gas inlet; A combustion device, which has a combustion part, a comb-shaped combustion air distribution duct for auxiliary combustion, and a high-temperature flue gas outlet. The combustion part includes an igniter, a pyrolysis gas inlet, and a pyrolysis gas auxiliary combustion air inlet that are nested. The pyrolysis gas inlet is arranged around the igniter, and the pyrolysis gas auxiliary combustion air inlet is arranged outside the pyrolysis gas inlet. The pyrolysis gas inlet is connected to the pyrolysis gas outlet through multiple connected pipes. The pipes include a first horizontal pipe connected to the pyrolysis gas outlet, a second horizontal pipe connected to the pyrolysis gas inlet, and an inclined pipe connecting the first horizontal pipe and the second horizontal pipe. An ash outlet is provided at the connection of the inclined pipe and the second horizontal pipe. The high-temperature flue gas outlet is connected to the high-temperature flue gas inlet; the high-temperature flue gas outlets are provided at both the top and side of the combustion device. Comb-shaped heat-exchanged flue gas distribution ducts are arranged mirror-symmetrically on both sides of the high-temperature flue gas outlet at the top of the combustion device. The comb-shaped heat-exchanged flue gas distribution ducts are connected to the outlet for heat-exchanged flue gas, and a heat-exchanged flue gas fan is provided in the comb-shaped heat-exchanged flue gas distribution ducts. The comb-shaped combustion air distribution ducts for auxiliary combustion are symmetrically arranged on both sides of the combustion device.

2. The system for treating domestic waste according to claim 1, characterized in that, High-temperature flue gas inlets are provided on both sides of the heating chamber on the same horizontal plane, and the high-temperature flue gas outlets at the top and side of the combustion device are respectively connected to the high-temperature flue gas inlets on both sides of the heating chamber.

3. The system for treating domestic waste according to claim 1, characterized in that, The combustion device is provided with a pyrolysis gas auxiliary burner, and the heating chamber is provided with an auxiliary burner.

4. The system for treating domestic waste according to claim 1, characterized in that, The inclined pipe is provided with a heat tracing part and a vibrating part.

5. The system for treating domestic waste according to claim 1, characterized in that, A control valve for heated flue gas and a temperature-pressure-combustion efficiency detection part are provided on the pipeline connecting the outlet for heated flue gas and the flue gas inlet, and the control valve for heated flue gas is connected to the temperature-pressure-combustion efficiency detection part.

6. The system for treating domestic waste according to claim 3, characterized in that, The heating chamber is provided with a heating temperature - pressure detector, and the heating temperature - pressure detector is connected to the pyrolysis gas auxiliary burner, the auxiliary burner, and the flue gas fan after heat exchange.

7. The system for treating domestic waste according to claim 5, wherein, the comb - shaped combustion - assisting air distribution duct is connected to the combustion - assisting fan, and the combustion - assisting fan is connected to the temperature - pressure - combustion efficiency detector.

8. The system for treating domestic waste according to claim 5, wherein, heating flue gas outlets are respectively provided in the heating chamber near the inlet of the dried domestic waste and near the pyrolysis carbon outlet, and the heating flue gas control valve is arranged on the pipeline between the heating flue gas outlet near the pyrolysis carbon outlet and the flue gas inlet, and the temperature - pressure - combustion efficiency detector is arranged on the pipeline that gathers all the heating flue gas from the heating flue gas outlets.

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