County domestic waste incineration device and waste heat utilization system and method thereof

Abstract

The invention discloses a county domestic waste incineration device and a waste heat utilization system and method thereof.The device comprises a furnace body, the main body of the furnace body is cylindrical, a furnace cover is arranged at the upper end of the furnace body and movably covers an end opening of the furnace body, and a smoke exhaust opening is formed in the furnace cover and communicated with a smoke exhaust pipeline; a gap is reserved between the peripheral surface of the outer edge of the fire grate and the inner wall of a port at the lower end of the furnace body; a pre-screening plate partially covering the opening area of the furnace body is arranged at the upper end of the furnace body and used for screening to-be-burnt objects, and the pre-screening plate is obliquely arranged so that the screened to-be-burnt objects can enter the furnace body along different falling paths by means of gravity; when household garbage is intensively thrown and incinerated, the garbage in different diameter ranges is thrown to the fire grate at the bottom in the incinerator body in batches according to different paths to be borne so that the garbage can be incinerated, the garbage combustion sufficiency can be improved, and the problem that combustion is not thorough due to the fact that garbage in different sizes is stacked too densely is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste incineration treatment, and in particular to a county domestic waste incineration device and a waste heat utilization system and method. Background Art

[0002] Among the methods of urban garbage treatment, incineration is a relatively effective garbage treatment method. The use of existing equipment can basically achieve the treatment goals of harmlessness, reduction and resource utilization.

[0003] In the prior art, waste incinerators are usually used to improve the efficiency of the treatment of tons of domestic waste in cities every day. They can burn domestic waste at high temperatures, convert organic matter into heat energy and ash, and then use the high-temperature heat energy generated by waste incineration to generate steam or hot water through the boiler for heating or domestic hot water. It is also possible to further configure a steam turbine generator set to convert the steam generated by the boiler into electrical energy for supplying electricity to the surrounding areas. In addition, heating pipes can be laid to provide heating or other hot water needs to surrounding buildings.

[0004] However, before using a waste incinerator to treat domestic waste, due to the large number of types and different sizes of domestic waste, the waste randomly piled in the furnace is very likely to have non-combustible areas. Therefore, before the waste actually enters the furnace, it is usually necessary to crush it to help it burn fully, but the addition of this process greatly reduces the efficiency of waste treatment. Summary of the invention

[0005] The object of the present invention is to provide a county domestic waste incineration device and its waste heat utilization system and method to solve the problem that garbage is piled up and overlapped in the incinerator to form a pile with too high density, which affects the completeness of combustion.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: The first aspect of the present invention provides a county domestic waste incineration device, comprising: a furnace body, the main body of which is cylindrical, a furnace cover is provided at the upper end of the furnace body and movably covers the port thereof, a smoke exhaust port is opened on the furnace cover and connects to a smoke exhaust pipeline; a grate is provided at the lower end of the furnace body, a gap is left between the outer edge circumference of the grate and the inner wall of the lower end port of the furnace body, the grate is used for carrying the material to be combustible and can discharge the slag downward by gravity; wherein, a pre-screening plate partially covering the opening area of ​​the furnace body is provided at the upper end of the furnace body for screening the material to be combustible, and the pre-screening plate is arranged to tilt so that the screened material to be combustible can enter the furnace body along different falling paths by gravity.

[0007] Furthermore, the pre-screening plate comprises an installation outer frame arranged along the outer edge of the upper opening of the furnace body, and screening bars are equidistantly arranged inside the installation outer frame, and the combustible materials are pre-screened through the spacing between the screening bars; the installation outer frame is rotatably connected to the upper opening of the furnace body; wherein, a rotating rod is provided on the side edge of the installation outer frame in the middle of the furnace body, and both ends of the rotating rod are connected to the port wall of the furnace body through a ratchet structure, and the pre-screening plate can be rotated upward with the rotating rod as the axis to form an angle with the upper end surface of the furnace body; the pre-screening plate is tilted and positioned in the range of 30°-60°, so that the screened combustible materials can enter the interior of the furnace body along different falling paths by gravity.

[0008] Furthermore, a vertical partition plate is provided inside the furnace body along its central axis surface to separate the furnace body into a first combustion chamber and a second combustion chamber; after the combustible material is screened by the pre-screening plate, part of the combustible material slides from the pre-screening plate into the first combustion chamber, and the rest of the combustible material freely falls through the pre-screening plate into the second combustion chamber; wherein, the partition plate extends upward from the plane where the grate is located inside the furnace body, and a distance is left between the top of the partition plate and the upper port of the furnace body.

[0009] Furthermore, an upper sieve plate and a lower sieve plate are provided in sequence from top to bottom in the second combustion chamber for screening the materials to be combusted; wherein the screening accuracy of the pre-screening plate, the upper sieve plate, the lower sieve plate and the grate is increased in sequence from top to bottom, so that the materials to be combusted are stacked in layers and burned in the second combustion chamber.

[0010] Furthermore, the upper sieve plate and the lower sieve plate are fixedly mounted on the inner wall of the furnace body and coincide with its cross section; wherein, a spacing is left between the upper sieve plate, the lower sieve plate and the inner wall of the furnace body, and the outer periphery of the upper sieve plate and the lower sieve plate are fixedly connected to the inner wall of the furnace body by provided support rods; the top end of the partition plate is higher than the cross section where the upper sieve plate is located.

[0011] Furthermore, an outwardly protruding annular ridge is provided on the peripheral wall of the furnace body near its upper end, and the annular ridge is used to support the furnace cover; the furnace cover is protruded outwardly to form a spherical shell shape surrounding the upper end opening of the furnace body.

[0012] Furthermore, the grate is rotatably connected to the side wall of the furnace body so that the grate can discharge slag in an inclined state; wherein, a limiting protrusion is provided on the inner side wall of the furnace body, the limiting protrusion protrudes toward the furnace body, and the limiting protrusion is located below the grate and abuts against it; the limiting protrusion is located on a diameter perpendicular to the rotating axis of the grate; a limiting groove is provided on the grate for the limiting protrusion to be embedded, and the limiting groove is vertically opened on the grate from the lower surface wall of the grate without passing through.

[0013] Furthermore, a counterweight is provided on the lower surface wall of the grate on one side of the rotating shaft thereof, and the counterweight is provided on the side where the limiting protrusion is located, so that the grate itself can maintain a relatively stable state when the combustibles on the grate are unevenly distributed.

[0014] The second aspect of the present invention provides a waste heat utilization system for a domestic waste incineration device, including: a flue gas waste heat recovery device, which is connected to the furnace body to receive the flue gas and uses the heat exchange pipes therein to exchange heat; a water storage tank, in which tap water is stored and pumped to the heat exchange pipes to exchange heat with the flue gas; and an insulation box, which is used to receive the tap water heated in the heat exchange pipes and keep it warm.

[0015] The third aspect of the present invention provides a method for utilizing waste heat from a domestic waste incineration device, the steps of which are as follows: S1. Domestic waste is burned as a combustible in the incineration device to produce upward high-temperature smoke discharge; S2. The high-temperature flue gas is guided into the flue gas waste heat recovery device through the exhaust pipe, and the heat exchange is carried out by surrounding the heat exchange tube inside the device; S3, the tap water stored in the water tank is pumped into the heat exchange tube as the heat exchange medium to achieve heat exchange; S4. The heated tap water is pumped to the insulated box for storage and use.

[0016] Compared with the prior art, the present invention has the following beneficial effects: When domestic waste is placed in a centralized manner for incineration, the present invention arranges a pre-screening plate at the waste placement port above the furnace body, so that waste within different diameter ranges is placed in batches according to different paths and carried on the grate at the bottom of the furnace body, and then the combustion-supporting materials pre-placed on the grate are ignited in the furnace body to incinerate the waste, thereby helping to improve the completeness of waste combustion and avoiding the problem of incomplete combustion caused by over-dense accumulation of waste of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] Figure 1 A simplified structural diagram of a waste heat utilization system of a county domestic waste incineration device provided by the present invention; Figure 2 A three-dimensional structural diagram of a county domestic waste incineration device provided by the present invention; Figure 3 for Figure 2 Exploded view and partial view of the Figure 4 for Figure 3 perspective drawing; Figure 5for Figure 4 Enlarged view of middle Ⅰ; Figure 6 for Figure 4 A front view of the middle furnace body and its internal structure; Figure 7 A front view of a furnace body and its internal structure in another embodiment provided by the present invention; Figure 8 A schematic diagram of the structure of a grate in another embodiment of the present invention; Fig. 9 for Figure 3 Three-dimensional structural diagram of the pre-screening plate.

[0019] The numbers in the figure represent the following: 10. Furnace body; 11. Furnace cover; 12. Smoke exhaust port; 13. Grate; 14. Ring edge; 15. Limiting protrusion; 16. Limiting groove; 17. Counterweight; 20. Pre-screening plate; 21. Mounting frame; 22. Screening bar; 23. Rotating rod; 24. Ratchet structure; 30. Partition plate; 31. First combustion chamber; 32. Second combustion chamber; 33. Upper sieve plate; 34. Lower sieve plate; 35. Support rod; 40. Flue gas waste heat recovery device; 50. Water storage tank; 60. Insulation box. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1-3 As shown, the present invention provides a county-level domestic waste incineration device, comprising: The furnace body 10 is cylindrical in shape. A furnace cover 11 is provided at the upper end of the furnace body to cover the port movably. A smoke exhaust port 12 is provided on the furnace cover 11 to communicate with a smoke exhaust pipeline. A grate 13 is provided at the lower end of the furnace body 10. A gap is left between the outer peripheral surface of the grate 13 and the inner wall of the lower end port of the furnace body 10. The grate 13 is used to carry the combustibles and can discharge the slag downward by gravity. Among them, a pre-screening plate 20 partially covering the opening area of ​​the furnace body 10 is provided at the upper end for screening the combustibles. The pre-screening plate 20 is tilted so that the screened combustibles can enter the furnace body 10 along different falling paths by gravity.

[0022] The present invention provides a county domestic waste incineration device. When domestic waste is centrally placed for incineration, a pre-screening plate 20 is set at the waste placement port above the furnace body 10, so that wastes in different diameter ranges are placed in batches according to different paths and carried on the grate 13 at the bottom of the furnace body 10. Then, the combustion-supporting materials pre-placed on the grate 13 are ignited in the furnace body 10 to incinerate the waste, thereby helping to improve the completeness of waste combustion and avoid the problem of incomplete combustion caused by over-dense accumulation of wastes of different sizes.

[0023] In the above embodiment, when pre-screening the garbage, the pre-screening plate 20 needs to be placed obliquely above the furnace body 10, and the inclination angle and screening accuracy of the pre-screening plate 20 will affect the screening of the garbage. When the screening effect of the pre-screening plate 20 is not good, it will affect the sufficiency of garbage combustion.

[0024] To solve the above problems, please continue to refer to Figure 3 , 9 As shown, the pre-screening plate 20 includes an installation frame 21 arranged along the outer edge of the upper opening of the furnace body 10, and screening strips 22 are equidistantly arranged inside the installation frame 21, and the combustible materials are pre-screened through the spacing between the screening strips 22; the installation frame 21 is rotatably connected to the upper opening of the furnace body 10; wherein, a rotating rod 23 is provided on the side edge of the installation frame 21 in the middle of the furnace body 10, and both ends of the rotating rod 23 are connected to the port wall of the furnace body 10 through a ratchet structure 24, and the pre-screening plate 20 can be rotated upward with the rotating rod 23 as the axis to form an angle with the upper end surface of the furnace body 10; the pre-screening plate 20 is tilted and positioned in the range of 30°-60°, so that the screened combustible materials can enter the interior of the furnace body 10 along different falling paths by gravity.

[0025] In this embodiment, by setting an inclination-adjustable pre-screening plate 20 at the upper opening of the furnace body 10, the difficulty of the garbage sliding off the pre-screening plate 20 can be changed by adjusting its inclination angle. After the garbage is pre-screened, by increasing the inclination angle of the pre-screening plate 20, the large pieces of garbage that are not easy to fall down due to being stuck between the screening bars 22 can slide into the furnace body 10. It should be noted in this embodiment that the structure of the furnace body 10 can include a cylindrical shape or a square cylindrical shape, so as to set a pre-screening plate 20 of a suitable size to cover the upper opening area of ​​the furnace body 10, and at the same time avoid that part of the garbage does not pass through the screening of the pre-screening plate 20 and directly enters the furnace body 10 during the garbage delivery process; the adjustment of the pre-screening plate 20 can be achieved by pre-positioning through the ratchet structure 24, and can also be driven by a power motor to achieve automatic control and adjustment.

[0026] In the above embodiment, after being screened, the garbage freely falls into the grate 13 provided at the bottom of the furnace body 10. When the garbage impacts the grate 13, the garbage is easily dispersed in various directions of the grate 13, thereby forming uneven mixing and overlapping again, affecting the completeness of the garbage combustion.

[0027] In order to solve the above problems, Figure 4 As shown, in a preferred embodiment provided by the present invention based on the above-mentioned embodiments, a vertical partition plate 30 is provided inside the furnace body 10 along its axial surface to divide the furnace body 10 into a first combustion chamber 31 and a second combustion chamber 32; after the combustibles are screened by the pre-screening plate 20, part of the combustibles slide from the pre-screening plate 20 into the first combustion chamber 31, and the rest of the combustibles freely fall through the pre-screening plate 20 into the second combustion chamber 32; wherein, the partition plate 30 extends upward from the plane where the grate 13 is located inside the furnace body 10, and a distance is left between the top end of the partition plate 30 and the upper end of the furnace body 10.

[0028] In this embodiment, by setting the partition plate 30 on the grate 13, the garbage is allowed to fall freely after being screened and enter the grate 13 set at the bottom of the furnace body 10. After impacting the grate 13, the garbage is scattered, but due to the obstruction of the partition plate 30, the garbage is not easy to be dispersed in all directions of the grate 13 during the scattering process, and it is even more difficult to cross the partition plate 30 and enter the opposite combustion chamber, thereby avoiding the uneven mixing and overlapping of the already screened garbage again, which helps to achieve the separate combustion of the garbage, so that the garbage is fully burned. It should be noted in this embodiment that the partition plate 30 can be a grille plate, which can block the garbage with a smaller diameter in the second combustion chamber 32 from passing through and entering the first combustion chamber 31, and at the same time, the garbage can be burned together in the two combustion chambers to avoid the isolation of heat and smoke from each other; at the same time, it can also avoid the need to repeatedly ignite the garbage in the two combustion chambers in the early stage of the preparation work for the garbage incineration operation, thereby improving the efficiency of the preparation work before incineration.

[0029] In the above embodiment, since the diameter range of the garbage in the second combustion chamber 32 is relatively small, it may still be densely accumulated on the grate 13 after being screened by the pre-screening plate 20, which is not conducive to improving the incineration efficiency of the garbage in the second combustion chamber 32.

[0030] In order to solve the above problems, Figure 4-6 As shown, in a preferred embodiment provided by the present invention based on the above-mentioned embodiment, an upper sieve plate 33 and a lower sieve plate 34 are provided in sequence from top to bottom in the second combustion chamber 32 for screening the materials to be combusted; wherein, the screening accuracy of the pre-screening plate 20, the upper sieve plate 33, the lower sieve plate 34 and the grate 13 is increased in sequence from top to bottom, so that the materials to be combusted are stacked in layers and burned in the second combustion chamber 32.

[0031] More specifically, the upper sieve plate 33 and the lower sieve plate 34 are fixedly arranged on the inner wall of the furnace body 10 and coincide with its cross section; wherein, a spacing is left between the upper sieve plate 33, the lower sieve plate 34 and the inner wall of the furnace body 10, and the outer periphery of the upper sieve plate 33 and the lower sieve plate 34 is fixedly connected to the inner wall of the furnace body 10 by a support rod 35; the top end of the partition plate 30 is higher than the cross section where the upper sieve plate 33 is located.

[0032] In this embodiment, by setting the pre-screening plate 20, the upper screen plate 33, the lower screen plate 34, and the grate 13, the garbage entering the second combustion chamber 32 is screened multiple times in sequence, so that the garbage can be trapped in layers on the corresponding upper screen plate 33 or lower screen plate 34, and the garbage carried on each layer of the screen plate is burned independently; and the garbage located below can provide heat energy for the garbage located above it during combustion, thereby achieving the effect of preheating the garbage to evaporate its moisture.

[0033] In order to facilitate the installation of the furnace cover 11 on the furnace body 10, please continue to refer to Figure 3-4 As shown, an outwardly protruding annular ridge 14 is provided on the peripheral wall of the furnace body 10 near its upper end, and the annular ridge 14 is used to support the furnace cover 11; the furnace cover 11 is protruding outward to form a spherical shell shape surrounding the upper end opening of the furnace body 10.

[0034] In the above embodiment, the slag is easily accumulated on the grate 13 and is difficult to be discharged, and is easy to occupy the space for subsequent waste incineration.

[0035] In order to solve the above problems, Figure 7-8 As shown, in a preferred embodiment provided by the present invention based on the above embodiments, the grate 13 is rotatably connected to the side wall of the furnace body 10 so that the grate 13 can discharge slag in an inclined state; wherein, a limiting protrusion 15 is provided on the inner side wall of the furnace body 10, and the limiting protrusion 15 protrudes toward the furnace body, and the limiting protrusion 15 is located below the grate 13 and abuts against it; the limiting protrusion 15 is located on a diameter perpendicular to the rotation axis of the grate 13; a limiting groove 16 for the limiting protrusion 15 to be embedded is opened on the grate 13, and the limiting groove 16 is vertically opened on the grate 13 from the lower surface wall of the grate 13 without through-hole.

[0036] In order to stabilize the position of the grate 13, please continue to refer to the figure. A counterweight 17 is provided on the lower surface wall of the grate 13 on one side of its rotation axis. The counterweight 17 is provided on the side where the limiting protrusion 15 is located so that the grate 13 can maintain a relatively stable state when the combustibles on the grate 13 are unevenly distributed.

[0037] Based on any of the above embodiments, the present invention also provides a waste heat utilization system for incineration of domestic waste, such as Figure 1As shown, the system includes: a flue gas waste heat recovery device 40, which is connected to the furnace body 10 to receive the flue gas and uses the heat exchange tube 41 therein to exchange heat; a water storage tank 50, in which tap water is stored and pumped to the heat exchange tube 41 to exchange heat with the flue gas; and a heat preservation box 60, which is used to receive the tap water heated in the heat exchange tube 41 and keep it warm.

[0038] Based on a waste heat utilization system for incineration of domestic waste provided by the present invention, a waste heat utilization method is also provided, and the steps are as follows: S1. Domestic waste is burned as a combustible in the incineration device to produce upward high-temperature smoke discharge; S2. The high-temperature flue gas is guided into the flue gas waste heat recovery device through the exhaust pipe, and the heat exchange is carried out by surrounding the heat exchange tube inside the device; S3, the tap water stored in the water tank is pumped into the heat exchange tube as the heat exchange medium to achieve heat exchange; S4. The heated tap water is pumped to the insulated box for storage and use.

[0039] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A county-level domestic waste incineration device, characterized in that: include: A furnace body (10) is provided at the upper end of the furnace body with a furnace cover (11) movably covering the port thereof, and a smoke exhaust port (12) is provided on the furnace cover (11) to communicate with a smoke exhaust pipeline; a grate (13) is provided at the lower end of the furnace body (10), and a gap is left between the outer peripheral surface of the grate (13) and the inner wall of the lower end port of the furnace body (10); the grate (13) is used to carry materials to be combusted and can discharge slag downward by gravity; The upper end of the furnace body (10) is provided with a pre-screening plate (20) partially covering the opening area thereof for screening the materials to be combusted, and the pre-screening plate (20) is arranged at an angle so that the screened materials to be combusted can enter the interior of the furnace body (10) along different falling paths by gravity.

2. A county domestic waste incineration device according to claim 1, characterized in that: The pre-screening plate (20) comprises an installation outer frame (21) arranged along the outer edge of the upper opening of the furnace body (10), screening bars (22) being arranged at equal intervals in the installation outer frame (21), and the combustibles are pre-screened through the spacing between the screening bars (22); the installation outer frame (21) is rotatably connected to the upper opening of the furnace body (10); Wherein, a rotating rod (23) is provided on a side edge of the mounting outer frame (21) in the middle of the furnace body (10); both ends of the rotating rod (23) are connected to the port wall surface of the furnace body (10) via a ratchet structure (24); and the pre-screening plate (20) can rotate upward with the rotating rod (23) as an axis to form an angle with the upper end surface of the furnace body (10); The pre-screening plate (20) is tilted and positioned within a range of 30°-60°, so that the screened combustibles can enter the furnace body (10) along different falling paths by gravity.

3. A county domestic waste incineration device according to claim 2, characterized in that: A vertical partition plate (30) is provided along the central axis of the furnace body (10) to divide the furnace body (10) into a first combustion chamber (31) and a second combustion chamber (32); after the combustible material is screened by the pre-screening plate (20), part of the combustible material slides from the pre-screening plate (20) into the first combustion chamber (31), and the rest of the combustible material freely falls through the pre-screening plate (20) into the second combustion chamber (32); The partition plate (30) extends upward from the plane where the grate (13) is located inside the furnace body (10), and a distance is left between the top end of the partition plate (30) and the upper port of the furnace body (10).

4. A county domestic waste incineration device according to claim 3, characterized in that: An upper sieve plate (33) and a lower sieve plate (34) are provided in the second combustion chamber (32) from top to bottom for screening the materials to be combusted; The screening accuracies of the pre-screening plate (20), the upper screen plate (33), the lower screen plate (34), and the grate (13) are increased from top to bottom, so that the combustibles are stacked in layers and burned in the second combustion chamber (32).

5. A county domestic waste incineration device according to claim 4, characterized in that: The upper sieve plate (33) and the lower sieve plate (34) are fixedly mounted on the inner wall of the furnace body (10) and coincide with its cross section; There is a gap between the upper sieve plate (33), the lower sieve plate (34) and the inner wall of the furnace body (10), and the outer peripheries of the upper sieve plate (33) and the lower sieve plate (34) are fixedly connected to the inner wall of the furnace body (10) via support rods (35); The top end of the partition plate (30) is higher than the cross section of the upper sieve plate (33).

6. A county domestic waste incineration device according to claim 5, characterized in that: An outwardly protruding annular ridge (14) is provided on the peripheral wall of the furnace body (10) near its upper end, and the annular ridge (14) is used to support the furnace cover (11); the furnace cover (11) is protruding outwardly to form a spherical shell shape surrounding the upper end opening of the furnace body (10).

7. A county domestic waste incineration device according to claim 2, characterized in that: The grate (13) is rotatably connected to the side wall of the furnace body (10), so that the grate (13) can discharge slag in a tilted state; Wherein, a limiting protrusion (15) is provided on the inner side wall of the furnace body (10), the limiting protrusion (15) protrudes toward the furnace body, and the limiting protrusion (15) is located below the grate (13) and abuts against it; The limiting protrusion (15) is located on a diameter perpendicular to the rotation axis of the grate (13); The grate (13) is provided with a limiting groove (16) for the limiting protrusion (15) to be embedded in, and the limiting groove (16) is vertically opened on the grate (13) from the lower surface wall of the grate (13) in a non-through manner.

8. A county domestic waste incineration device according to claim 7, characterized in that: A counterweight (17) is provided on the lower surface wall of the grate (13) at one side of the rotation axis thereof, and the counterweight (17) is provided on the side where the limiting protrusion (15) is located, so that the grate (13) can maintain a relatively stable state when the combustibles on the grate (13) are unevenly distributed.

9. A waste heat utilization system using the domestic waste incineration device according to any one of claims 1 to 8, characterized in that: include: A flue gas waste heat recovery device (40), which is connected to the furnace body (10) to receive the flue gas and uses the heat exchange pipe (41) therein to perform heat exchange; A water storage tank (50) in which tap water is stored and then pumped to the heat exchange tube (41) for heat exchange with the flue gas; The heat preservation box (60) is used to receive the tap water heated in the heat exchange tube (41) and to keep it warm.

10. A waste heat utilization method using the waste heat utilization system according to claim 9, the steps of which are as follows: S1. Domestic waste is burned as a combustible in the incineration device to produce upward high-temperature smoke discharge; S2. The high-temperature flue gas is guided into the flue gas waste heat recovery device through the exhaust pipe, and the heat exchange is carried out by surrounding the heat exchange tube inside the device; S3, the tap water stored in the water tank is pumped into the heat exchange tube as the heat exchange medium to achieve heat exchange; S4. The heated tap water is pumped to the insulated box for storage and use.

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