CN119844772A

CN119844772A - Household garbage incinerator

Info

Publication number: CN119844772A
Application number: CN202510319534.9A
Authority: CN
Inventors: 肖志华; 李卫国
Original assignee: Hunan Xuanteng Technology Co ltd
Current assignee: Hunan Xuanteng Technology Co ltd
Priority date: 2025-03-18
Filing date: 2025-03-18
Publication date: 2025-04-18
Anticipated expiration: 2045-03-18
Also published as: CN119844772B

Abstract

A domestic waste incinerator comprises a furnace body, which is composed of an inner shell and an outer shell, the outer shell is a heat-insulating shell, and the inner shell is a heat-conducting steel shell, characterized in that a combustion chamber is arranged between the inner shell and the outer shell, at least one combustion stove is arranged in the combustion chamber, the combustion stove is arranged at the lower part of the inner shell, a feeding port is arranged on the furnace body, a grid is arranged at the bottom of the inner shell, an ignition device is arranged below the grid, an air entrainment system is arranged at the upper part of the inner shell, the air entrainment system is connected to the combustion stove in the combustion chamber, an exhaust port is opened in the combustion chamber, and an ash outlet is arranged at the lower part of the furnace body; the domestic waste incinerator makes full use of the heat energy generated by the domestic waste itself during the incineration to crack and gasify it, and has good thermal efficiency utilization rate.

Description

Household garbage incinerator

Technical Field

The invention relates to a household garbage incinerator, in particular to a household garbage incinerator with a furnace body composed of an inner shell and an outer shell.

Background

In the production and living process, a great deal of household garbage is inevitably generated, most of the household garbage is treated by adopting a centralized burning mode, but the centralized burning has the problem of high transportation cost, so the technical scheme of a plurality of small-sized garbage incinerators appears, as disclosed in Chinese patent CN 117433011A, the hot air double-combustion-chamber garbage high-temperature pyrolysis gasification furnace is structurally characterized in that an upper combustion chamber is arranged at the upper part in the furnace body, a heat exchanger is arranged above the upper combustion chamber, a lower cover lower part on the heat exchanger is arranged between a heat exchanger shell and a furnace body, a cavity which is convenient for air flow to pass through is reserved between the inner surface of the lower cover and the outer surface of the furnace body, a cavity which is convenient for air flow to pass through is reserved between the lower cover lower end and the bottom of the furnace body, the shell on the heat exchanger is arranged in the heat exchanger, a cavity which is convenient for air flow to pass through is reserved between the inner surface of the shell and the outer surface of the lower cover, a U-shaped cavity which is convenient for air flow to pass through is formed, and a combustion chamber is arranged at the bottom of a pyrolysis chamber above the ash collecting chamber. The purpose is to provide a hot air double combustion chamber garbage high-temperature cracking gasification furnace with low energy consumption, when in use, combustion chamber fuel gas is firstly ignited and put into wood dust for combustion, when ash collecting chamber at the bottom of a furnace body is filled with ash soil, materials are extruded and pushed into a furnace body cracking chamber by a feeding device, at the moment, the temperature in the cracking chamber is higher than the temperature, combustible gas generated by material cracking rises into an upper combustion chamber, at the moment, the combustible gas flowing out of the upper combustion chamber is ignited by manpower through an observation port on a shell and a lower cover, then the observation port is closed, the high-temperature gas after combustion is discharged into the atmosphere through a heat exchanger, at the moment, cold air conveyed by a blower is downwards operated through a cavity between the inner surface of the shell and the outer surface of the lower cover after being heated by the heat exchanger, then upwards operated through a cavity between the inner surface of the lower cover and the outer surface of the furnace body, and the surface of the furnace body is heated, so that the temperature in the cracking chamber is kept at more than 300 ℃, at the moment, the fire in the combustion chamber can be closed, and when the temperature in the cracking chamber is lower than 300 ℃, the temperature in the combustion chamber, the combustion chamber is ignited, so that the temperature in the combustion chamber rises again. The scheme adopts the hot gas generated by the upper combustion chamber to heat the air through heat exchange and then flow back to the outside of the pyrolysis furnace for heating, the heat loss is larger, the repeated use of fuel gas is needed for ignition heating, the use process is more complicated, the efficiency is lower, as disclosed in Chinese patent CN 203671618U, the medical waste pyrolysis treatment device with the recycling of the pyrolysis gas comprises a pyrolysis furnace, accessory equipment and an induced draft fan, the pyrolysis furnace comprises a furnace body, a feeding device, a flue gas channel, a pyrolysis gas channel and an ash discharge device, the pyrolysis furnace further comprises a temperature measurement and control system, and the temperature measurement and control system mainly comprises temperature sensors, and the auxiliary equipment comprises a semi-dry scrubber and a bag type dust collector. The technical scheme that pyrolysis gas is ignited through a pyrolysis gas combustion nozzle and the furnace bottom is heated is disclosed, in practical application, the content of combustible gas is unstable because the pyrolysis gas is complex in composition, the ignition through the combustion nozzle is extremely difficult, and the ignition of the combustible gas in a closed cavity has extremely high safety risk, so that the development of a household garbage incinerator is urgently needed.

Disclosure of Invention

The invention provides a household garbage incinerator for solving the technical problems, which comprises the following specific technical scheme: the household garbage incinerator comprises an incinerator body, wherein the incinerator body comprises an inner shell and an outer shell, the outer shell is a heat insulation shell, the inner shell is a steel guide heat shell, a combustion cavity is formed between the inner shell and the outer shell, at least one combustion stove is arranged in the combustion cavity, the combustion stove is arranged at the lower part of the inner shell, a feed port is formed in the incinerator body, a grid plate is arranged at the bottom of the inner shell, a igniting device is arranged below the grid plate, an air entraining system is arranged at the upper part of the inner shell, the air entraining system is communicated with the combustion stove in the combustion cavity, an exhaust port is formed in the combustion cavity, an ash outlet is formed in the lower part of the incinerator body, a water-vapor separator is arranged outside the incinerator body, an air inlet end of the water-vapor separator is communicated with the inner shell, an air outlet end of the water-vapor separator is communicated with the combustion stove by the air entraining system, and an air distribution system is arranged on the combustion stove. In this way, when the household garbage incinerator operates, household garbage is added into the inner shell through the feed inlet and the feed inlet is closed, then the ignition device is ignited, and the household garbage is ignited, at the moment, the household garbage contacted with the ignition device is in an insufficient combustion state, and is cracked and gasified into combustible gas, the invention leads the combustible gas into the combustion chamber through the air-entraining system arranged at the upper part of the inner shell to ignite the combustion stove, when the combustion stove is ignited, the combustion chamber needs to be communicated with the outside, so as to prevent the ignition of the combustible gas in the closed cavity from causing safety accidents, the flame generated by the combustion stove directly burns and heats the inner shell, so that the cracking and gasification of the household garbage in the inner shell are accelerated, the content of combustible gas in the air-entraining system is increased, and the combustion firepower of the combustion stove is increased, so that the cracking and gasification speed of the household garbage in the inner shell is increased more and more through the mutual promotion process, the ignition device can be closed after the combustion stove normally burns in operation, the household garbage in the inner shell is not required to be ignited, and harmful substances such as dioxin in tail gas are basically burnt out due to high-temperature combustion, and tail gas generated by the combustion stove is discharged from the exhaust port; the outer shell is a heat insulation shell, reduces heat loss generated by combustion of the combustion stove, greatly improves the temperature in the combustion cavity, further improves the temperature in the inner shell, particularly the inner shell is a steel guide heat shell, can fully conduct high temperature generated by burning the inner shell of the combustion stove into the inner shell to form a high-temperature cracking gasification environment, thus greatly improving the efficiency of the garbage incinerator, in addition, the combustion stove at the lower part of the shell toasts wet household garbage, greatly reduces the water content of the garbage to be burnt, solves the problems that the prior incinerator is not easy to ignite and burn to be easy to agglomerate when incinerating wet household garbage; in addition, because the domestic garbage generally has higher water content, water vapor is generated in the cracking gasification process, the combustion efficiency of the combustion stove is reduced due to the water vapor, when the water vapor content is too high, even the water vapor is difficult to combust, and simultaneously, the water vapor takes away a large amount of heat, so that the water vapor mixed in the combustible gas generated by the cracking gasification of the domestic garbage in the inner shell can be separated by arranging a water vapor separator between the inner shell and the combustion stove, the water content of the combustible gas is reduced, the combustion quality of the combustion stove is improved, the temperature in a combustion cavity is further improved, after the combustion stove is provided with a gas distribution system, the gas distribution system can distribute sufficient oxygen required by the combustion stove according to the requirement, the combustion quality of the combustion stove can be further improved, the combustion stove is fully combusted, the content of harmful gas is reduced, through practical verification, when the water content in the domestic garbage is high, the cracking gasification reaction generated by self-combustion in the inner shell is very slow, even the cracking gasification can be carried out by additionally heating through electric heating or an additional source, the cracking gasification can be carried out, the mixed water vapor in the combustible gas generated by the cracking gasification can be separated by arranging the separator, the combustible gas can be further heated by arranging the separator, the mixed water vapor in the combustible gas can be further heated by the gas combustion system, the separated water vapor can be further heated by the additional gas combustion system to the combustion can be further heated by the combustion can be more stable combustion system, the combustion can be burnt, the combustion can be more quickly carried out, the combustion steam can be burnt, the combustion can be burnt, and the combustion can be burnt, the harmful gas can be burnt, and has better gas is more stable, and has better combustion gas quality, and has better combustion quality, and better combustion quality can be combusted, and better quality can be combusted, through the mutual promotion process, the domestic garbage cracking and gasifying speed in the inner shell is faster and faster, the domestic garbage incineration efficiency is greatly improved, and experiments prove that the water vapor content in the combustible gas can be reduced by about 65% and the domestic garbage incineration efficiency is improved by about 160% at present.

Further, the exhaust port is connected with an exhaust gas cooler, and the exhaust gas cooler is also connected with an exhaust gas purifier. Therefore, when the exhaust port is connected with the exhaust cooler, high-temperature exhaust gas exhausted from the combustion cavity can be cooled, so that the exhaust gas can not cause regional temperature influence on the surrounding environment, and when the exhaust cooler is connected with the exhaust purifier, the exhaust cooler can cool the exhaust gas to reduce the stability influence on the exhaust purifier, and the exhaust purifier can further purify harmful gas in the exhaust gas to further reduce the emission of the harmful gas.

Further, the inner housing is obliquely arranged in the outer housing, and the combustion stove is arranged below the inclined surface of the inner housing. Therefore, after the inner shell is obliquely arranged in the outer shell, the contact area between household garbage in the inner shell and the inner shell is increased after the combustion stove is arranged below the inclined plane of the inner shell, so that the household garbage can be more fully contacted with the wall surface of the high-temperature inner shell, the cracking and gasification speed of the household garbage is increased, the contact area between the inner shell and combustion flame of the combustion stove is increased after the combustion stove is arranged below the inclined plane of the inner shell, the heat absorption efficiency of the inner shell is increased, and the temperature of a cavity in the inner shell is rapidly increased.

Further, the ignition device comprises a combustible gas tank body and a gas distribution mechanism. When the ignition device comprises the combustible gas tank body and the gas distribution mechanism, the ignition device can directly ignite and further ignite household garbage in the inner shell, and does not need to be filled with other ignition materials for ignition, and of course, inflammables such as firewood and the like can be covered on the ignition device for ignition; in addition, when the domestic garbage starts to crack and gasify in the inner shell and the generated combustible gas is insufficient to enable the combustion stove to burn, the combustible gas in the combustible gas tank body is introduced into the combustion stove to be combusted in an auxiliary mode, and therefore harmful gas is not discharged to the outside.

Further, a gas driving fan is arranged in the air entraining system, and the gas driving fan drives air supply to the direction of the combustion stove. Therefore, when the gas driving fan drives the air supply to the direction of the combustion range, negative pressure can be formed in the inner shell, so that household garbage in the inner shell is promoted to be quickly cracked and gasified from the lower layer to the upper layer, the combustion efficiency of the household garbage incinerator is improved, meanwhile, the gas driving fan can accelerate the airflow velocity in the gas guiding system, reduce the blocking effect of a bent part of a pipeline on the airflow, and further, the gas driving fan is an axial flow fan, the pipeline of the gas guiding system is a circular pipe, the axial flow fan is arranged in the circular pipeline, and the air guiding system is also provided with an airflow velocity sensor which is in linkage control with the airflow velocity sensor to control the rotating speed of the gas driving fan, so that the airflow velocity in the gas guiding system is stably kept.

Further, at least one fire bridge is arranged on the inner shell, one end of the fire bridge is arranged in the inner shell, the other end of the fire bridge is arranged above the combustion stove, or the fire bridge is a flat steel plate, or the fire bridge is a steel pipeline, the steel pipeline penetrates through the inner shell, an opening at the lower end of the steel pipeline is arranged above the combustion stove, and the upper end of the steel pipeline is communicated with the outer wall of the inner shell. The combustion furnace comprises an inner shell, a combustion furnace body, a combustion furnace, a steel pipeline penetrates through the inner shell, an opening at the lower end is arranged above the combustion furnace body, the periphery of the combustion furnace body is often in an anoxic state, so that household garbage can be better cracked and gasified to generate a large amount of combustible gas, the combustion of the combustion furnace body is more vigorous, a virtuous cycle is formed, the efficiency of the household garbage incinerator can be further improved, when the combustion furnace body is a flat steel plate, in the combustion furnace body with the same volume, compared with the rod-shaped combustion furnace body, the contact area of the flat steel plate and the household garbage is larger, the fire guiding efficiency is higher, the steel pipeline penetrates through the inner shell, the opening at the lower end is arranged above the combustion furnace body, the upper end is communicated with the outer wall of the inner shell, and the flame high-temperature gas generated by combustion furnace combustion can be better cracked and gasified along the pipeline to generate a large amount of combustible gas, so that the combustion furnace body can be more vigorous in the combustion furnace body can be more easily generated, and the combustion furnace body can be more well combusted, and the virtuous cycle can be more easily generated, and the combustion efficiency of the combustion furnace can be better can be promoted, and the combustion of the combustion furnace can be better generated, the combustion furnace is better has better, and the combustion efficiency can be better has better improved, compared with the combustion furnace.

Further, the combustion stove is an annular pipe, and a plurality of combustion hole sites are formed in the annular pipe. So, when the burning kitchen is the annular pipe, when seting up a plurality of burning hole sites on the annular pipe, the burning kitchen is arranged in inner shell bottom, and after combustible gas was introduced wherein and was lighted, the inner shell was burnt to annular flame of formation in outer shell bottom to make the inner shell obtain even burning, and then make the domestic waste in the inner shell obtain even acceleration schizolysis, thereby improve domestic waste incinerator's efficiency.

Further, the grid plate arranged at the bottom of the inner shell is arched upwards to form an upward concave space, or at least one ash discharging gear is arranged between the gaps of the grid plate, and the ash discharging gear is driven by a motor. Therefore, when the grid plate arranged at the bottom of the inner shell is arched upwards to form an upward concave space, household garbage in the inner shell is arranged above the upward concave space, after the ignition device is ignited, the flame in the central area can quickly ignite the household garbage on the upper part of the inner shell, and the household garbage is quickly cracked and gasified upwards and around, so that the phenomenon of uneven combustion is not easy to occur, and at least one ash discharging gear is arranged between grid plate gaps and is driven by a motor, the gear is driven by the motor to discharge ash in the inner shell through starting the motor, the difficulty of manual ash discharging is reduced, ash is discharged simultaneously under the condition that normal operation is not influenced, and the efficiency is improved.

Further, an exhaust gas driving fan is arranged at or behind the exhaust port, and the exhaust gas driving fan blows air in the exhaust direction. So, be provided with tail gas drive fan behind gas vent department or gas vent, when tail gas drive fan was to exhaust direction blast, can form the negative pressure in the burning chamber, the exhaust in the burning chamber is discharged with higher speed, improves the combustion efficiency of burning kitchen in the burning chamber, makes its burning more smooth and easy abundant, is favorable to improving garbage incinerator's work efficiency.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.

FIG. 1 is a schematic diagram of a cross-sectional structure of a household garbage incinerator according to the invention;

FIG. 2 is a schematic view of another cross-sectional structure of the household garbage incinerator according to the present invention;

FIG. 3 is a schematic view showing another sectional structure of the household garbage incinerator according to the present invention;

FIG. 4 is a schematic view of another cross-sectional structure of the household garbage incinerator according to the present invention;

FIG. 5 is a schematic view showing another sectional structure of the household garbage incinerator according to the present invention;

FIG. 6 is a schematic view showing another sectional structure of the household garbage incinerator according to the present invention;

fig. 7 is a schematic view of another sectional structure of the household garbage incinerator according to the present invention;

FIG. 8 is a schematic view showing another sectional structure of the household garbage incinerator according to the present invention;

fig. 9 is a schematic view of another sectional structure of the household garbage incinerator according to the present invention;

fig. 10 is a schematic view of another sectional structure of the household garbage incinerator according to the present invention;

FIG. 11 is a schematic cross-sectional view of an ash discharging structure of the household garbage incinerator according to the present invention;

Fig. 12 is a schematic plan view of a burner of the household garbage incinerator according to the present invention;

The device comprises a furnace body 1-, an inner shell 2-, an outer shell 3-, a combustion chamber 4-, a combustion stove 5-, a feed inlet 6-, a grid plate 7-, a pilot device 8-, a gas-introducing system 9-, a gas-discharging port 10-, an ash outlet 11-, a water-vapor separator 12-a gas distribution system 13-a gas distribution system 14-a tail gas cooler 15-a tail gas purifier 16-a combustible gas tank 17-a gas distribution mechanism 18-a gas driving fan 19-a fire bridge 20-an ash discharging gear and a tail gas driving fan 21-a gas-discharging device. The arrows indicate the direction of air flow, and the filler in the filler inner case 2 means household garbage, and each drawing is only a schematic structural view.

Detailed Description

The following detailed description of the invention, taken in conjunction with the accompanying drawings, is given by way of illustration and explanation only, and should not be taken as limiting the scope of the invention in any way.

The embodiment of the invention is as follows, as shown in fig. 1 and 2, the household garbage incinerator comprises a furnace body 1, the furnace body 1 consists of an inner shell 2 and an outer shell 3, the outer shell 3 is a heat insulation shell, the inner shell 2 is a steel guided heat shell, a combustion cavity 4 is arranged between the inner shell 2 and the outer shell 3, two combustion stoves 5 are arranged in the combustion cavity 4, the combustion stoves 5 are arranged at the lower part of the inner shell 2, a feed port 6 is arranged on the furnace body 1, a grid plate 7 is arranged at the bottom of the inner shell 2, a igniting device 8 is arranged below the grid plate 7, an air entraining system 9 is arranged at the upper part of the inner shell 2, the air entraining system 9 is communicated with the combustion stoves 5in the combustion cavity 4, the combustion cavity 4 is provided with an exhaust port 10, the lower part of the furnace body is provided with an ash outlet 11, wherein the inner side of the outer shell 3 is composed of steel plate external fireproof materials, the inner shell 2 is filled with household garbage, the igniting device 8 is in a combustion igniting state, the combustion stoves 5 is in a combustion state, and is in a combustion state of the inner shell 2, and the combustion stoves 2 is in a combustion state, and the combustion device can be continuously ignited after the combustion of the garbage in the bottom of the inner shell 2 is sufficient and the combustion device is generated; the ash outlet is closed, the feed inlet 6 is also an overhaul inlet of the inner shell 2, the ignition device 8 is a gas stove, and the ignition device can be replaced by burning a firewood or other combustion matters. As shown in fig. 1, a water-vapor separator 12 is arranged outside the furnace body 1, an air inlet end of the water-vapor separator 12 is communicated with the inner shell 2 by an air-entraining system 9, an air outlet end of the water-vapor separator 12 is communicated with the combustion stove 5 by the air-entraining system 9, the water-vapor separator 12 is shown as an air-cooled water-vapor separator, in order to further improve separation efficiency, the water-cooled water-vapor separator is adopted for water-vapor separation, the combustion stove 5 is provided with an air distribution system 13, the air distribution system 13 is an air blower, and when the air blower is started, a large amount of air is blown into the combustion stove 5 to be fully combusted.

In another embodiment of the present invention, as shown in fig. 3, the exhaust port 10 is connected to an exhaust gas cooler 14, and an exhaust gas purifier 15 is further connected to the exhaust gas cooler 14.

In another embodiment of the present invention, as shown in fig. 6, the inner housing 2 is obliquely disposed in the outer housing 3, and the burner 5 is disposed below the inclined surface of the inner housing 2, and the burner 5 is illustrated as being provided with two stepped arrangements.

In another embodiment of the present invention, as shown in fig. 4, the ignition device 8 includes a flammable gas tank 16 and a valve mechanism 17, the fuel in the flammable gas tank may be liquefied gas or other compressed flammable gas for home use, the valve mechanism 17 is a ventilation pipe communicated with the outside for introducing air required by the flammable gas during combustion, and as shown in fig. 5, the pipe is used for introducing the flammable gas in the flammable gas tank into the combustion stove 5 for auxiliary combustion.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 5 and 8, a gas driving fan 18 is disposed in the air entraining system 9, the gas driving fan 18 drives air to blow toward the combustion range 5, as shown in fig. 5 and 8, the gas driving fan 18 is an axial flow fan, the air entraining system 9 is a circular pipe, and the axial flow fan is disposed in the circular pipe.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 3, 4, 7 and 9, a fire bridge 19 is disposed on the inner housing 2, one end of the fire bridge 19 is disposed in the inner housing 2, the other end is disposed above the burner 5, as shown in fig. 9, the fire bridge 19 is a flat steel plate, as shown in fig. 3, 4 and 7, the fire bridge 19 is a steel pipe, the steel pipe passes through the inner housing 2, the lower end opening is disposed above the burner 5, and the upper end is communicated with the outer wall of the inner housing 2.

In another embodiment of the present invention, as shown in fig. 12, the combustion range 5 is an annular tube, and a plurality of combustion holes are formed in the annular tube.

In another embodiment of the present invention, as shown in fig. 10, the grid plate 7 disposed at the bottom of the inner housing 2 arches upward to form an upward concave space, and as shown in fig. 11, an ash discharging gear 20 is disposed between the slits of the grid plate 7, and the ash discharging gear 20 is driven by a motor.

In another embodiment of the present invention, as shown in fig. 5 and 10, an exhaust gas driving fan 21 is disposed behind the exhaust port 10, and the exhaust gas driving fan 21 blows air in the exhaust direction.

Claims

1. A domestic waste incinerator, comprising a furnace body (1), the furnace body (1) comprising an inner shell (2) and an outer shell (3), the outer shell (3) being a heat-insulating shell, the inner shell (2) being a heat-conducting shell made of steel, characterized in that a combustion chamber (4) is arranged between the inner shell (2) and the outer shell (3), at least one combustion stove (5) is arranged in the combustion chamber (4), the combustion stove (5) is arranged at the lower part of the inner shell (2), a material inlet (6) is arranged on the furnace body (1), a grid plate (7) is arranged at the bottom of the inner shell (2), and a An ignition device (8) is provided, an air entrainment system (9) is provided at the upper part of the inner shell (2), the air entrainment system (9) is connected to a combustion stove (5) in a combustion chamber (4), the combustion chamber (4) is provided with an exhaust port (10), an ash outlet (11) is provided at the lower part of the furnace body, a water vapor separator (12) is provided outside the furnace body (1), an air inlet end of the water vapor separator (12) is connected to the inner shell (2) by the air entrainment system (9), and an air outlet end of the water vapor separator (12) is connected to the combustion stove (5) by the air entrainment system (9), and the combustion stove (5) is provided with an air distribution system (13).

2. The domestic waste incinerator according to claim 1, characterized in that the exhaust port (10) is connected to an exhaust gas cooler (14), and an exhaust gas purifier (15) is connected after the exhaust gas cooler (14).

3. The domestic waste incinerator according to claim 1, characterized in that the inner shell (2) is placed obliquely inside the outer shell (3), and the combustion stove (5) is placed below the inclined surface of the inner shell (2).

4. The domestic waste incinerator according to any one of claims 1 to 3, characterized in that the ignition device (8) comprises a combustible gas tank (16) and a gas distribution mechanism (17).

5. The domestic waste incinerator according to any one of claims 1 to 3, characterized in that a gas-driven fan (18) is provided in the air intake system (9), and the gas-driven fan (18) drives air to be supplied in the direction of the combustion stove (5).

6. The domestic waste incinerator according to any one of claims 1 to 3, characterized in that at least one fire bridge (19) is arranged on the inner shell (2), one end of the fire bridge (19) is arranged in the inner shell (2), and the other end is arranged above the combustion stove (5); or the fire bridge (19) is a flat steel plate; or the fire bridge (19) is a steel pipe, which passes through the inner shell (2), with the lower end opening placed above the combustion stove (5) and the upper end connected to the outer wall of the inner shell.

7. The domestic waste incinerator according to any one of claims 1 to 3, characterized in that the combustion stove (5) is an annular tube, and a plurality of combustion holes are opened on the annular tube.

8. The domestic waste incinerator according to any one of claims 1 to 3, characterized in that the grid plate (7) arranged at the bottom of the inner shell (2) is arched upward to form an upper concave space; or at least one ash discharge gear (20) is arranged between the gaps of the grid plate (7), and the ash discharge gear (20) is driven by a motor.

9. The domestic waste incinerator according to any one of claims 1 to 3, characterized in that an exhaust gas driven fan (21) is provided at or after the exhaust port (10), and the exhaust gas driven fan (21) blows air in the exhaust direction.