Small household garbage incinerator

Abstract

The small household garbage incinerator comprises an incinerator body and a feeding device, an incineration hearth and a reburning hearth are arranged in the incinerator body, and the tops of the incineration hearth and the reburning hearth communicate with each other; a first air distribution system is arranged on the lower portion of the incineration hearth and used for feeding hot air to serve as primary air so as to blow household garbage to be in a rotating state and provide oxygen. A second air distribution system is arranged in the middle of the incineration hearth and used for feeding hot air to serve as secondary air so as to push combustible materials to continue to rotate and supplement oxygen. The upper part of the incineration hearth is connected with a tertiary air pipe which is used for feeding gasified garbage water as tertiary air so as to burn out combustible components in the garbage water; a spiral protruding edge is arranged on the inner side wall of the reburning hearth from top to bottom and used for guiding smoke to spirally descend. Conditions can be provided for garbage burnout in a small space, combustible materials enter the reburning hearth in the tangential direction to be continuously burnt after being heated and burnt in the burning hearth for a period of time, auxiliary fuel is saved, and the burning cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of environmental protection and domestic waste treatment, and in particular relates to a small domestic waste incinerator. Background Art

[0002] In the field of domestic waste treatment, in some cities, especially in rural areas, the amount of domestic waste generated is not large and the locations are scattered. The use of large-scale incineration equipment for centralized treatment has problems such as difficulty in collection and high transportation costs. At present, small-scale vehicle-mounted waste incineration devices have been put into use. Due to the limited volume of the incinerator of such a small-scale vehicle-mounted waste incineration device, it is difficult for gaseous combustibles to be completely burned, or because the incinerator occupies too much space, only simple flue gas pollutant treatment devices can be installed, and flue gas pollutants are difficult to meet emission standards. In addition, during the operation of small-scale domestic waste incinerators, due to the low calorific value and high moisture content of the garbage, auxiliary fuel (diesel or liquefied natural gas) is often required to be continuously supplied to maintain stable combustion, which increases the cost of waste incineration and is not conducive to large-scale promotion and application. In view of this, it is necessary to study a small-scale domestic waste incinerator. Summary of the invention

[0003] In order to solve the shortcomings of the prior art, the purpose of the present invention is to provide a small-scale domestic waste incinerator, which can provide conditions for the combustion of garbage in a small space. After the combustibles are heated and burned in the incineration furnace for a period of time, they enter the reburning furnace tangentially to continue burning, thereby saving auxiliary fuel and reducing the incineration cost.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: A small-scale domestic waste incinerator comprises an incinerator body and a feeding device, wherein the interior of the incinerator body is provided with an incineration furnace chamber and a reburning furnace chamber which are connected at the top; a first air distribution system is provided at the lower part of the incineration furnace chamber for introducing hot air as primary air to blow the domestic waste into a rotating state and provide oxygen; a second air distribution system is provided at the middle part of the incineration furnace chamber for introducing hot air as secondary air to push the combustibles to continue rotating and replenish oxygen; a tertiary air duct is connected to the upper part of the incineration furnace chamber for introducing gasified waste moisture as tertiary air to burn out the combustible components therein; a spiral convex edge is provided on the inner side wall of the reburning furnace chamber from top to bottom for guiding the flue gas to spirally descend.

[0005] Preferably, the first air distribution system and the second air distribution system both include a main air supply pipe fixed on the outer wall of the incineration furnace and air supply branch pipes respectively arranged on both sides of the outer wall of the incineration furnace and connected to the main air supply pipe.

[0006] Preferably, the four corners of the lower inner wall of the aforementioned incineration furnace are all provided with first nozzles located in the same horizontal plane and connected to the air supply branch pipe of the first air distribution system. The jet directions of the four first nozzles form a first inner imaginary circle and a first outer imaginary circle with the centers coinciding in the center of the incineration furnace. The inner boundary of the airflow ejected from the first nozzle is tangent to the first inner imaginary circle, and the outer boundary of the airflow ejected is tangent to the first outer imaginary circle, and the airflows ejected from the four first nozzles rotate in the same direction.

[0007] Preferably, the angle between the inner boundary of the airflow ejected from the first nozzle and the side wall of the incineration chamber near the reburning chamber is 30~36°, and the angle between the outer boundary of the airflow ejected from the first nozzle and the side wall of the incineration chamber near the reburning chamber is 16~22°.

[0008] Preferably, second nozzles located in the same horizontal plane and connected to the air supply branch pipes of the second air distribution system are arranged at the four corners in the middle part of the inner wall of the aforementioned incineration furnace chamber, and the jet directions of the four second nozzles form a second inner imaginary circle and a second outer imaginary circle with coincident centers in the center of the incineration furnace chamber, the inner boundary of the airflow ejected from the second nozzle is tangent to the second inner imaginary circle, the outer boundary of the airflow ejected is tangent to the second outer imaginary circle, and the airflows ejected from the four second nozzles rotate in the same two directions.

[0009] Preferably, the angle between the inner boundary of the airflow ejected from the second nozzle and the side wall of the incineration chamber near the reburning chamber is 22~28°, and the angle between the outer boundary of the airflow ejected from the first nozzle and the side wall of the incineration chamber near the reburning chamber is 19~25°.

[0010] Preferably, the aforementioned feeding device includes a charging hopper, a feeding control unit and a conveying unit which are sequentially connected from top to bottom, the outlet end of the conveying unit is connected to the middle part of the incineration furnace, and a cover plate is rotatably arranged on the top of the charging hopper; rotating plate assemblies are arranged on both sides inside the feeding control unit, and the rotating plate assemblies include a rotating shaft and a plurality of rotating plates vertically welded on the rotating shaft at equal intervals, and the rotation directions of the two rotating shafts are opposite; a conveying chain plate is arranged inside the conveying unit, and the conveying unit is inclined at an angle of 2 to 8° to the horizontal plane.

[0011] Preferably, the outer edge of the aforementioned rotating plate is provided with tooth-like protrusions, the shape of the protrusions is a quadrangular pyramid, the height is 0-50 mm, and the tooth spacing is 0-100 mm.

[0012] Preferably, a dry air inlet header and a dry air outlet header are respectively provided at the bottom and the top of the aforementioned conveying part, and the dry air inlet header and the dry air outlet header are respectively connected to the dry air duct and the tertiary air duct.

[0013] Preferably, the cross-section of the aforementioned reburning furnace is a square with chamfered corners, and the bottoms of the reburning furnace and the incineration furnace are respectively provided with a porous plate and a grate.

[0014] The present invention is beneficial in that: (1) The present invention adopts a turning furnace, which is composed of an incineration furnace and a reburning furnace, and can provide conditions for the complete combustion of garbage in a small space. After the combustibles are heated and burned in the incineration furnace for a period of time, they enter the reburning furnace along the tangential direction and spirally descend under the guidance of the spiral convex edge of the wall surface, thereby increasing the rotation intensity of the flue gas in the reburning furnace, so that the combustible gas can contact and react with the oxygen in the air in time, ensuring the complete combustion of the combustible gas; (2) The hot air of the present invention is delivered into the incineration furnace in three parts. The jet direction of the primary air at the four corners forms an imaginary tangent circle at the center of the furnace, which has a large momentum and can blow the domestic garbage into a rotating state to prevent the domestic garbage from accumulating on the grate; the jet direction of the secondary air at the four corners forms an imaginary tangent circle at the center of the furnace, which pushes the combustibles (solid and gaseous) to continue to rotate and mix strongly with the hot air, thereby timely replenishing the oxygen required for the later stage of combustion; the tertiary air is delivered from the top of the incineration furnace, which is conducive to burning out the combustible components therein; after stable operation, heat recycling can be formed, and normal combustion and burning out of domestic garbage can be achieved without auxiliary fuel, thus saving auxiliary fuel and reducing the incineration cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a three-dimensional picture of the incinerator body; Figure 3 It is a schematic diagram of the structure of the feeding device; Figure 4 is a front view of the rotating plate; Figure 5 It is a cross-sectional diagram of primary wind; Figure 6 It is the cross-sectional diagram of secondary air; Figure 7 It is a three-dimensional image of the spiral convex edge; Figure 8 This is an expanded view of the reburning furnace wall.

[0016] The meanings of the reference numerals in the figure are: 1. incinerator body, 101. incineration furnace, 102. reburning furnace, 103. spiral convex edge, 104. first nozzle, 105. porous plate, 106. grate, 2. feeding device, 201. charging hopper, 202. feeding control unit, 203. conveying unit, 204. rotating plate, 3. tertiary air duct, 4. main air supply pipe, 5. branch air supply pipe, 6. dry air inlet manifold, 7. dry air outlet manifold, 8. dry air duct. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] See also Figure 1 and Figure 2 A small-sized domestic waste incinerator of the present invention comprises an incinerator body 1 and a feeding device 2. The incinerator body 1 is provided with an incineration furnace chamber 101 and a reburning furnace chamber 102 connected at the top, which can be used under the condition of small space restriction (length ≯3.3m, width ≯2.7m, height ≯2.6m, waste incineration capacity 150~200kg / h). The incinerator adopts a turning furnace chamber, which is composed of an incineration furnace chamber 101 and a reburning furnace chamber 102, and can provide conditions for the waste to be burned out in a small space. After the combustibles are heated and burned in the incineration furnace chamber 101 for a period of time, they enter the reburning furnace chamber 102 along the tangent direction and continue to burn until they are exhausted and discharged.

[0019] Domestic garbage, air and auxiliary fuel all enter from the incineration furnace 101, where they are heated, gasified and burned, and solid ash enters the ash room through the bottom grate 106. Gaseous combustibles and flue gas rotate upward in this furnace to enter the reburning furnace 102 tangentially. In the reburning furnace 102, the unburned gaseous combustibles continue to burn, and rotate downward with the flue gas until they are completely burned, pass through the bottom porous plate 105, and enter the flue. The incinerator uses air supply ducts arranged at the four corners of the incineration furnace 101 to deliver hot air to the furnace. The temperature of the hot air can reach 350~450℃. The hot air jet forms a rotating annular airflow in the incineration furnace 101. The domestic garbage entering the incineration furnace 101 is turned and sucked in like a tornado, mixed strongly with the air, and is quickly heated, gasified, and burned by the hot air; in the reburning furnace 102, the flue gas rotates downward until the combustibles therein are completely burned, and then is drawn out of the reburning furnace 102 from the bottom.

[0020] See also Figure 3 The feeding device 2 includes a charging hopper 201, a feeding control unit 202 and a conveying unit 203 which are sequentially connected from top to bottom. The charging hopper 201 is a quadrangular pyramid structure, the middle feeding control unit 202 is a cubic structure, and the lower conveying unit 203 is a cubic structure with an inclination angle of 2 to 8 degrees with the horizontal plane. The outlet end of the conveying unit 203 is connected to the middle of the incineration furnace 101. The top of the charging hopper 201 is rotatably provided with a cover plate. One side of the cover plate can rotate around the axis connected to the charging hopper 201 and the cover plate, and the other side can be linked with the garbage bin lifting device. When the garbage bin rises, the cover plate of the charging hopper 201 is lifted by linkage; when the garbage bin falls, the cover plate is closed by linkage to reduce air leakage. The bottom and top of the conveying unit 203 are respectively provided with a dry air inlet header 6 and a dry air outlet header 7, and the dry air inlet header 6 and the dry air outlet header 7 are respectively connected to the dry air duct 8 and the tertiary air duct 3.

[0021] A rotating plate 204 assembly is provided on both sides of the feed control unit 202. The rotating plate 204 assembly includes a rotating shaft and a plurality of rotating plates 204 welded vertically on the rotating shaft at equal intervals. The two rotating shafts rotate in opposite directions. The rotating plates 204 of the two parallel axes are staggered at an angle of 45° during installation to increase the space for the garbage circulation part and the pulling effect on the garbage. The rotating shaft is driven by a frequency conversion motor through a reduction gear box to drive a pair of mutually meshing gears to make the two parallel rotating shafts of the rotating plate 204 rotate in clockwise and counterclockwise directions respectively, and the speed is controlled at 16-30 rpm.

[0022] See also Figure 4 The outer edge of the rotating plate 204 is provided with tooth-like protrusions, which are in the shape of a quadrangular pyramid, with a height of 0-50 mm and a tooth spacing of 0-100 mm. A conveying chain plate 205 is provided inside the conveying part 203. The characteristic of this method is that there is basically no friction between the conveying chain plate 205 and the garbage, which can ensure smooth transportation. The chain plate driving gear shaft is driven by a variable frequency motor through a reduction box, and the speed is controlled at 10-20 rpm.

[0023] See also Figure 5 and Figure 6 The lower part of the incineration furnace 101 is provided with a first air distribution system for sending hot air as primary air to blow the domestic garbage into a rotating state and provide oxygen. The primary air volume accounts for about 45% of the total air volume, has a large momentum, and the wind speed can reach about 20m / s, blowing the domestic garbage to rotate and tumble continuously to prevent the domestic garbage from accumulating on the grate 106. The middle part of the incineration furnace 101 is provided with a second air distribution system for sending hot air as secondary air. The secondary air volume accounts for about 40% of the total air volume, and the wind speed is controlled at about 15m / s to drive the combustibles to continue rotating and replenish oxygen.

[0024] The first air distribution system and the second air distribution system both include a main air supply pipe 4 fixed on the outer wall of the incineration furnace 101 and air supply branches 5 respectively arranged on both sides of the outer wall of the incineration furnace 101 and connected to the main air supply pipe 4. The four corners of the lower inner wall of the incineration furnace 101 are all provided with first nozzles 104 located in the same horizontal plane and connected to the air supply branches 5 of the first air distribution system. The jet directions of the four first nozzles 104 form a first inner imaginary circle and a first outer imaginary circle with the centers coinciding at the center of the incineration furnace 101. The inner boundary of the airflow ejected from the first nozzle 104 is tangent to the first inner imaginary circle, and the outer boundary of the airflow ejected is tangent to the first outer imaginary circle. The airflow ejected from the four first nozzles 104 rotates in the same direction. The angle a between the inner boundary of the airflow ejected from the first nozzle 104 and the side wall of the incineration furnace 101 near the reburning furnace 102 is 30-36°, and the angle b between the outer boundary of the airflow ejected from the first nozzle 104 and the side wall of the incineration furnace 101 near the reburning furnace 102 is 16-22°. The four corners in the middle of the inner wall of the incineration furnace 101 are all provided with second nozzles located in the same horizontal plane and connected to the air supply branch pipe 5 of the second air distribution system. The jet directions of the four second nozzles form a second inner imaginary circle and a second outer imaginary circle with the same center at the center of the incineration furnace 101. The inner boundary of the airflow ejected from the second nozzle is tangent to the second inner imaginary circle, and the outer boundary of the ejected airflow is tangent to the second outer imaginary circle, and the airflows ejected from the four second nozzles rotate in the same two directions. An angle c between the inner boundary of the airflow ejected from the second nozzle and the side wall of the incineration furnace 101 near the reburning furnace 102 is 22~28°, and an angle d between the outer boundary of the airflow ejected from the first nozzle 104 and the side wall of the incineration furnace 101 near the reburning furnace 102 is 19~25°.

[0025] The upper part of the incineration furnace 101 is connected to the tertiary air duct 3, which is used to feed the gasified garbage moisture as tertiary air to burn out the combustible components therein. The hot air is fed into the feeding device 2 from below the conveying part 203 of the feeding device 2 to heat and dry the garbage that is about to enter the incineration furnace 101, which is conducive to the garbage entering the incineration furnace 101 to ignite and burn as soon as possible. The air that has completed the heating and drying tasks is then extracted from the top of the conveying part 203 and fed into the top of the incineration furnace 101 as tertiary air to burn out the combustible components therein; because the air entering the incinerator is heated by recycling the heat from the incineration of garbage, the incinerator does not need to be fed with auxiliary fuel during normal operation, which greatly reduces the operating cost.

[0026] The hot air is sent into the incineration furnace 101 in three parts. The first part is sent into the furnace at the lower part of the furnace, and the primary air is sent in by the pipes arranged at the four corners of the furnace. The jet direction of the primary air at the four corners forms an imaginary tangent circle in the center of the furnace. The primary air has a large momentum, which blows the domestic garbage into a rotating state to prevent the domestic garbage from accumulating on the grate 106. The second part is sent into the furnace at the upper middle part of the incineration furnace 101. The secondary air is also sent in by the pipes arranged at the four corners of the furnace. The jet direction of the secondary air at the four corners forms an imaginary tangent circle in the center of the furnace, which pushes the solid and gaseous combustibles to continue to rotate, and mixes strongly with the hot air, and replenishes the oxygen required for the late stage of combustion in time. The third part is sent into the incineration furnace 101 at the top of the incineration furnace 101. This part of air is the hot air extracted from the conveying part 203 of the feeding device 2 to complete the heating and drying tasks of the domestic garbage. The air sent into the furnace is hot air formed by absorbing the heat of the flue gas after combustion in the incinerator, so that the heat generated by the incineration of domestic waste can be recycled. Under normal operating conditions, no auxiliary fuel diesel or liquefied natural gas is required, which greatly saves auxiliary fuel and reduces operating costs.

[0027] See also Figure 7 and Figure 8 The cross section of the reburning furnace 102 is a square with chamfers. The bottoms of the reburning furnace 102 and the incineration furnace 101 are respectively provided with a porous plate 105 and a grate 106. The inner wall of the reburning furnace 102 is provided with a spiral convex edge 103 from top to bottom. The spiral convex edge 103 can be built with refractory bricks to guide the flue gas to spiral down. The spiral convex edge can increase the rotation intensity, promote the full mixing of fuel and air, and meet the oxygen demand for combustion and burnout; the heat for heating the air comes from the heat released by the flue gas discharged from the incinerator, which improves the combustion conditions and realizes the recycling of the heat of garbage incineration. The air sent into the incineration furnace 101 is hot air at about 350°C. After entering the reburning furnace 102, the combustible gas in the flue gas continues to burn while rotating and spiraling down under the guidance of the spiral convex edge of the wall, thereby increasing the rotation intensity of the flue gas in the reburning chamber, allowing the combustible gas to contact and react with the oxygen in the air in time, ensuring that the combustible gas is completely burned before being discharged from the incinerator.

[0028] The air sent into the incineration furnace 101 is hot air at about 350℃~450℃. At the initial start-up, the hot air is heated by the electric heater arranged on the air supply duct, and the temperature of the furnace is rapidly increased together with the heat released by the combustion of the auxiliary fuel. After the temperature rises to a certain level, the auxiliary fuel burner is turned off, the feeding device 2 feeds domestic garbage, and the incinerator enters a normal combustion state. When the temperature of the flue gas sent out from the reburning furnace 102 reaches about 850℃, the electric heater is turned off, and the air entering the furnace absorbs the heat released by the flue gas to reach above 350℃. At this time, heat recycling is formed, and the incineration of domestic garbage can be normally burned and burned out without auxiliary fuel. Save auxiliary fuel and reduce incineration costs.

[0029] The bottom of the ash room is designed to be an inclined surface, which is inclined toward the ash outlet door. When the ash outlet door is opened, the garbage automatically flows out, making it easier to clean the ash. The amount of solid ash produced by the incineration of domestic waste is small, so regular cleaning is sufficient. The four walls of the incineration furnace 101 and the reburning furnace 102 are coated with high-radiation material coatings to accelerate the increase of furnace temperature and help maintain a stable furnace temperature and protect the furnace wall.

[0030] The incinerator achieves a combustion time of more than 2 seconds and an actual residence time of >3.3 seconds in a small space. The combustibles are fully mixed with the hot air during the combustion process, the burnout rate is high, the carbon content of the ash is <5%, and the average value of carbon monoxide in one hour is <100mg / Nm 3 , 24-hour average value <80mg / Nm 3 And it has technical effects such as greatly saving auxiliary fuel.

[0031] In order to better illustrate the present invention, the working process is specifically described below: During the startup of the incinerator, the induced draft fan installed on the flue of the incinerator is started first, and then the blower installed on the air supply main pipe 4 of the incinerator air distribution system is started, and the electric heater installed on the air supply main pipe 4 is started to continuously increase the temperature of the air entering the incineration furnace 101. After the hot air enters the incineration furnace 101, the walls of the incineration furnace 101 and the reburning furnace 102 are heated in turn, so that the temperatures of the incineration furnace 101 and the reburning furnace 102 are also continuously increased. If necessary, an auxiliary fuel burner is put into use to accelerate the heating process. The temperature of the smoke air flowing out of the reburning furnace 102 is also continuously increasing, and heat is released to the air about to enter the incineration furnace 101 through the heat exchanger.

[0032] At the initial start-up, the hot air is heated by the electric heater arranged on the air supply duct, and the temperature of the furnace is rapidly increased together with the heat released by the combustion of the auxiliary fuel. After the temperature rises to a certain level, the auxiliary fuel burner is turned off, the feeding device 2 feeds domestic waste, and the incinerator enters a normal combustion state. When the temperature of the flue gas sent out from the reburning furnace 102 reaches about 850°C, the electric heater is turned off, and the air entering the furnace absorbs the heat released by the flue gas to reach above 350°C, at which time heat recycling is formed. During the normal operation stage, the incineration of domestic waste does not require auxiliary fuel or electrically heated air, and can burn normally and burn out, saving auxiliary fuel and reducing incineration costs.

[0033] The domestic garbage is lifted and dumped in a barrel and enters the top loading hopper 201 of the feeding device 2. Under the pulling action of the rotating plate 204 of the feeding control unit 202 and the tooth-like protrusions on its outer edge, the garbage in the loading hopper 201 enters the chain plate of the conveying unit 203 along the falling channel, and moves toward the feeding port of the incineration furnace 101 with the chain plate at a certain speed until it falls into the incineration furnace 101. During operation, the feeding speed is mainly controlled by controlling the rotation speed of the rotating plate 204 of the feeding control unit 202. By adjusting the frequency of the variable frequency motor, the feeding amount is controlled at 150~200kg / h. In the process of the garbage moving to the incineration furnace 101 with the chain plate, a stream of hot air is sent from the bottom of the chain plate to heat and dry the garbage on the chain plate. After that, this stream of air carrying the moisture of the garbage is drawn from the top of the conveying unit 203 to the top of the incineration furnace 101 and enters the incineration furnace 101 as the tertiary air.

[0034] After the domestic garbage enters the incinerator 101, it mixes with the hot air sent in from the four corners of the furnace, and is constantly tumbling under the influence of the rotating airflow, accelerating the temperature rise, gasification, and combustion, with the highest temperature reaching about 900°C. The solid combustibles are consumed in the incinerator, and the ash falls into the ash room through the bottom grate 106. The unburned gaseous combustibles enter the reburning furnace 102 together with the flue gas to continue burning.

[0035] After the flue gas enters the reburning furnace 102, the combustible gas in the flue gas continues to burn, and under the guidance of the spiral convex edge of the wall, it rotates and spirals down, increasing the rotation intensity of the flue gas in the reburning chamber, so that the combustible gas and the oxygen in the air can contact and react in time, ensuring that the combustible gas is completely burned before being discharged from the incinerator. After the exhaust flue gas is cooled by the heat exchanger, it enters the subsequent dust removal, SO2, NOx and dioxin removal device for removal and clean emission.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A small-sized domestic waste incinerator, comprising an incinerator body (1) and a feeding device (2), characterized in that: The incinerator body (1) is provided with an incineration furnace chamber (101) and a reburning furnace chamber (102) which are connected at the top. The lower part of the incineration furnace (101) is provided with a first air distribution system for introducing hot air as primary air to blow the domestic waste into a rotating state and provide oxygen; A second air distribution system is provided in the middle of the incineration furnace (101) for supplying hot air as secondary air to drive the combustibles to continue rotating and to supplement oxygen; The upper part of the incineration furnace (101) is connected to a tertiary air duct (3) for feeding gasified garbage moisture as tertiary air to burn out the combustible components therein; The inner side wall of the reburning furnace (102) is provided with a spiral convex edge (103) from top to bottom, which is used to guide the smoke to descend in a spiral.

2. A small-sized domestic waste incinerator according to claim 1, characterized in that: The first air distribution system and the second air distribution system both comprise an air supply main pipe (4) fixed to the outer wall of the incineration furnace (101), and air supply branch pipes (5) respectively arranged on both sides of the outer wall of the incineration furnace (101) and connected to the air supply main pipe (4).

3. A small-sized domestic waste incinerator according to claim 2, characterized in that: First nozzles (104) located in the same horizontal plane and connected to the air supply branch pipe (5) of the first air distribution system are arranged at four corners of the lower inner wall of the incineration furnace chamber (101); the jet directions of the four first nozzles (104) form a first inner imaginary circle and a first outer imaginary circle whose centers coincide at the center of the incineration furnace chamber (101); the inner boundary of the airflow ejected by the first nozzle (104) is tangent to the first inner imaginary circle, and the outer boundary of the airflow ejected is tangent to the first outer imaginary circle; and the airflow ejected by the four first nozzles (104) rotates in the same direction.

4. A small-sized domestic waste incinerator according to claim 3, characterized in that: An angle a between an inner boundary of the airflow ejected from the first nozzle (104) and a side wall of the incineration furnace (101) close to the reburning furnace (102) is 30 to 36 degrees, and an angle b between an outer boundary of the airflow ejected from the first nozzle (104) and a side wall of the incineration furnace (101) close to the reburning furnace (102) is 16 to 22 degrees.

5. A small-sized domestic waste incinerator according to claim 2, characterized in that: Second nozzles located in the same horizontal plane and connected to the air supply branch pipe (5) of the second air distribution system are arranged at four corners in the middle of the inner wall of the incineration furnace (101). The jet directions of the four second nozzles form a second inner imaginary circle and a second outer imaginary circle whose centers coincide at the center of the incineration furnace (101). The inner boundary of the airflow ejected from the second nozzle is tangent to the second inner imaginary circle, and the outer boundary of the airflow ejected is tangent to the second outer imaginary circle. The airflow ejected from the four second nozzles rotates in the same two directions.

6. A small-sized domestic waste incinerator according to claim 5, characterized in that: An included angle c between an inner boundary of the airflow ejected from the second nozzle and a side wall of the incineration furnace (101) close to the reburning furnace (102) is 22 to 28 degrees, and an included angle d between an outer boundary of the airflow ejected from the first nozzle (104) and a side wall of the incineration furnace (101) close to the reburning furnace (102) is 19 to 25 degrees.

7. The small-sized domestic waste incinerator according to claim 1, characterized in that: The feeding device (2) comprises a charging hopper (201), a feeding control unit (202) and a conveying unit (203) which are connected in sequence from top to bottom, the outlet end of the conveying unit (203) is connected to the middle of the incineration furnace (101), and a cover plate is rotatably provided on the top of the charging hopper (201); rotating plate assemblies are provided on both sides of the inside of the feeding control unit (202), the rotating plate assemblies comprise a rotating shaft and a plurality of rotating plates (204) vertically welded to the rotating shaft at equal intervals, and the rotation directions of the two rotating shafts are opposite; a conveying chain plate (205) is provided inside the conveying unit (203), and the conveying unit (203) is inclined at an angle of 2 to 8 degrees with respect to the horizontal plane.

8. A small-sized domestic waste incinerator according to claim 7, characterized in that: The outer edge of the rotating plate (204) is provided with tooth-shaped protrusions, the protrusions are in the shape of a quadrangular pyramid, the height is 0-50 mm, and the tooth spacing is 0-100 mm.

9. A small-sized domestic waste incinerator according to claim 7, characterized in that: A drying air inlet header (6) and a drying air outlet header (7) are respectively provided at the bottom and the top of the conveying section (203); the drying air inlet header (6) and the drying air outlet header (7) are respectively connected to a drying air duct (8) and a tertiary air duct (3).

10. The small-sized domestic waste incinerator according to claim 1, characterized in that: The cross section of the reburning furnace (102) is a square with chamfered corners, and the bottoms of the reburning furnace (102) and the incineration furnace (101) are respectively provided with a porous plate (105) and a grate (106).

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