Rff co-combustion type garbage heat treatment furnace and method

Abstract

The application discloses a RFF mixed combustion type garbage heat treatment furnace and method. The furnace body comprises a combustion space, a pyrolysis space, a transfer mechanism and a pyrolysis gas injection port. The first oxygen supply pipeline in the combustion space is divided into upper, middle and lower three layers of injection ports, and three layers of fire zones are formed correspondingly. Solid and gaseous products generated by pyrolysis are sent into the combustion space respectively. The upper layer of injection ports is flush with the pyrolysis gas injection port, oxygen and pyrolysis gas are fully mixed and combusted to form the upper layer of fire zone, the heat of the upper layer and the middle layer of fire zone is used for counter-combusting the solid products, and the lower layer of fire zone is used for completely incinerating the solid products. The method comprises three steps of pyrolysis, counter-combustion and incineration. Through space separation and time sequence optimization, the organic components of garbage are treated in stages, the combustion efficiency is improved, and the generation and residue of harmful gas are reduced.

Description

Technical Field

[0001] This invention relates primarily to the field of waste treatment technology, and more particularly to an RFF co-firing waste thermal treatment furnace and method. Background Technology

[0002] In the field of waste management, thermal treatment (such as incineration and pyrolysis) is an effective means to significantly reduce the volume and amount of waste and recover energy. For small communities, islands, or scattered areas, small-scale waste thermal treatment furnaces have strong application potential due to their small footprint and relatively low investment. Common such equipment typically employs incineration and pyrolysis processes, but due to unreasonable furnace structure and workflow, large amounts of harmful gases are often generated during the thermal treatment process.

[0003] To meet environmental emission standards, the aforementioned large amounts of harmful gases must be treated by additional exhaust gas purification equipment. The purchase and installation of exhaust gas treatment equipment increases the initial construction cost of the waste thermal treatment unit. Its daily operation, maintenance, and consumable replacement will also generate continuous operating costs, ultimately significantly increasing the overall cost of waste treatment and limiting the promotion and application of small-scale waste thermal treatment technology.

[0004] Therefore, it is necessary to optimize the furnace structure and workflow to achieve full and thorough heat treatment of waste inside the furnace, minimize the generation of harmful gases, and thus reduce the overall treatment cost. Summary of the Invention

[0005] The technical problem this invention aims to solve is how to optimize the furnace structure and workflow to achieve full and thorough heat treatment of waste inside the furnace, minimize the generation of harmful gases, and thus reduce the overall processing cost.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] The RFF co-firing waste thermal treatment furnace includes a combustion space, a pyrolysis space, a transfer mechanism for moving solid products from pyrolysis into the combustion space, and pyrolysis gas nozzles for transferring gaseous products from pyrolysis into the combustion space. The combustion space is equipped with a first oxygen supply pipe, which has upper, middle, and lower nozzles spaced vertically. The upper nozzles are substantially flush with the pyrolysis gas nozzles, forming an upper fire zone; the middle nozzles form a middle fire zone; and the lower nozzles form a lower fire zone. The heat generated by the upper and middle fire zones causes back-burning of the solid products, while the lower fire zone incinerates the solid products. This structure, by setting up a pyrolysis space and introducing the solid and gaseous products from pyrolysis separately into the combustion space, combined with stratified oxygen supply, achieves zoned and graded co-processing of gaseous and solid products. Specifically, the upper nozzle is roughly flush with the pyrolysis gas nozzle. Oxygen introduced from the upper nozzle mixes thoroughly with the gaseous products (pyrolysis gas) introduced from the pyrolysis gas nozzle, producing a stable high-temperature flame and forming an upper fire zone. This upper fire zone not only consumes the pyrolysis gas, thus reducing the content of harmful gases, but the heat it generates can also be input back into the pyrolysis space, causing back-burning of the solid products, thereby saving energy. Simultaneously, the upper and middle fire zones back-burn (i.e., roast) the solid products below them, promoting further thermal decomposition to produce combustible gases such as CO. During this process, the solid products are further heat-treated, and the generated CO and other combustible gases are reused as fuel in the upper and middle fire zones, intensifying combustion. Furthermore, back-burning allows the solid products to undergo a gradual heating process, avoiding the runaway pyrolysis reaction and instantaneous release of large quantities of harmful gases caused by sudden temperature changes in traditional direct combustion. Afterward, the back-burned solid products enter the lower fire zone, where they are completely incinerated as fuel. This staged approach, combining pyrolysis, reverse combustion, and incineration, significantly improves combustion efficiency and thermal intensity, allowing organic matter to be more fully oxidized and decomposed, thereby effectively reducing the generation and residue of harmful gases.

[0008] The combustion space and the pyrolysis space are adjacent to each other and separated by a thermal radiation heating plate. The thermal radiation heating plate not only physically separates the combustion space and the pyrolysis space, preventing interference between materials and airflow in the two spaces and affecting the heat treatment effect, but also transfers the combustion heat in the combustion space to the pyrolysis space in the form of thermal radiation, providing a continuous and free heat source for waste pyrolysis, realizing the recovery and utilization of combustion heat, improving the overall thermal utilization efficiency of the furnace, reducing the input of external heat sources, and reducing the energy consumption of equipment operation; at the same time, there is no need to configure an additional heating device for the pyrolysis space, reducing the initial construction cost of the equipment and meeting the cost control requirements of small-scale waste treatment equipment.

[0009] The combustion space contains a rotating furnace disc for carrying solid products. The rotating furnace disc ensures that the solid products it carries are evenly distributed circumferentially and move slowly within the combustion space, effectively avoiding the problems of poor ventilation and local oxygen deficiency caused by material accumulation on traditional fixed grates. This ensures that the solid products are in full contact with oxygen from the oxygen supply nozzles, improving the uniformity and completeness of combustion. At the same time, the rotational motion continuously renews the surface of the solid products, which is beneficial for the exposure and oxidation of unburned carbon inside, significantly reducing the residual carbon rate in the ash and slag, and reducing the emission of harmful gases caused by incomplete combustion.

[0010] The rotating furnace disc has through-holes for ash and slag to pass through, and a burnout zone is formed below the rotating furnace disc. This configuration establishes an automatic ash and slag separation mechanism. The ash and slag, which are essentially burned out, can fall into the burnout zone through the through-holes under the influence of centrifugal force and gravity, preventing excessive accumulation and caking of ash and slag on the rotating furnace disc. This ensures that the surface of the rotating furnace disc is always in a well-ventilated state, which is conducive to effective contact between gas and the material below. Simultaneously, it enables continuous slag discharge, maintaining continuous operation of the unit without stopping the machine for slag removal. This significantly improves waste processing capacity and operational continuity, and reduces energy loss and the risk of secondary pollution caused by slag removal. After falling into the burnout zone, the ash and slag continue to burn in that area until completely burned out.

[0011] The combustion space is spherical. This spherical shape eliminates the sharp corners and dead zones of traditional rectangular or cylindrical furnaces, allowing for smoother vortex-like airflow within the furnace. This promotes thorough mixing of oxygen with combustible gases and solid byproducts, reducing the retention and deposition of unburned gases and particulate matter in corners. Simultaneously, the spherical structure possesses excellent pressure-bearing characteristics and uniform thermal stress distribution, effectively resisting the thermal expansion and mechanical stress generated by high-temperature combustion, thus extending the furnace's service life. Furthermore, this shape facilitates the uniform reflection and distribution of heat within the furnace, further enhancing the uniformity of combustion temperature, thereby contributing to the complete combustion of waste and the thorough decomposition of hazardous substances.

[0012] A perforated plate is installed at the top of the combustion space, with several holes formed on the side of the plate opposite to the pyrolysis gas nozzle. The perforated plate forms a flow equalization and filtration zone at the top of the furnace. As the flue gas rises and flows through the holes, airflow reorganization and vigorous mixing occur, prolonging the residence time of the flue gas in the high-temperature zone. This allows residual combustible gases and fine particles to undergo further complete combustion in this area. Simultaneously, the porous structure intercepts and captures rising fly ash particles, reducing the dust load in the flue gas and decreasing the workload and filter material wear of downstream dust removal equipment. Positioning the holes on the side of the perforated plate opposite to the pyrolysis gas nozzle further prolongs the residence time of the pyrolysis gas within the combustion space, preventing it from passing through the holes prematurely.

[0013] The orifice is configured as a variable cross-section orifice, with its lower half being cylindrical and its upper half being an inverted funnel shape, smaller at the bottom and larger at the top. The lower half of the variable cross-section orifice is cylindrical, which can guide the rising airflow, ensuring the stability of the rising airflow and preventing the airflow from deflecting and affecting the combustion effect; while when the airflow passes through the upper half of the variable cross-section orifice, it burns and produces a flame and expands rapidly, and the inverted funnel structure, smaller at the bottom and larger at the top, is conducive to the rapid diffusion of gas.

[0014] The top of the pyrolysis space or the transfer mechanism is formed with a sealable inlet. This sealable inlet can be sealed promptly after waste is added, preventing leakage of pyrolysis gas generated within the pyrolysis space, reducing pollutant emissions and energy loss. Simultaneously, the sealing structure prevents outside air from entering the pyrolysis space and interfering with the pyrolysis atmosphere, ensuring the stable progress of the pyrolysis process, improving the quality and yield of pyrolysis products, laying the foundation for sufficient subsequent incineration, and avoiding incomplete combustion due to substandard pyrolysis products.

[0015] The transfer mechanism is configured as a piston pusher. The piston pusher has the advantages of stable pushing force and controllable pushing stroke, which can accurately and quantitatively push the solid products in the pyrolysis space into the combustion space, avoiding excessive pushing that would lead to product accumulation in the furnace and insufficient oxygen contact, or insufficient pushing that would lead to low processing efficiency. Its structure is simple, reliable in operation, and low in maintenance cost, which can ensure the long-term stable operation of the transfer function, avoid the downtime of the device due to the failure of the transfer mechanism, and improve the continuous operation capability of the device.

[0016] The first oxygen supply pipe is vertically positioned in the center of the combustion space, and its bottom passes through the rotating furnace plate and connects to an external oxygen source. This vertical positioning, in conjunction with the rotating furnace plate, allows oxygen to diffuse radially from the center of the combustion zone, creating an inside-out oxygen supply pattern. This completely overcomes the technical defect of traditional sidewall oxygen supply, which easily creates an oxygen-deficient dead zone in the center of the furnace. It ensures that solid products at all radii of the furnace plate receive sufficient oxygen, especially providing the necessary oxidation conditions for material combustion in the central area of ​​the furnace plate. This achieves uniform and complete combustion throughout the entire furnace space, significantly improving combustion efficiency.

[0017] The RFF co-firing waste thermal treatment furnace also includes a secondary combustion space adjacent to the pyrolysis space. This secondary combustion space is connected to the top of the pyrolysis space and covers its outer side, radiating heat into it. The secondary combustion space essentially forms a high-temperature radiant sheath around the pyrolysis space. On one hand, it can perform secondary high-temperature combustion and decomposition of the small amount of incompletely combusted gas discharged from the combustion space, further reducing the content of harmful gases. On the other hand, it can continuously radiate the heat generated by the secondary combustion and some of the heat from the high-temperature flue gas in the combustion space into the pyrolysis space, thereby improving thermal efficiency, reducing external energy consumption, and lowering equipment operating costs. Furthermore, the enveloping design of the secondary combustion space makes the furnace structure more compact, reducing the equipment's footprint.

[0018] The RFF co-firing waste heat treatment furnace also includes several waterfall-style nozzles arranged around the inner wall of the combustion space. These nozzles supply oxygen to the furnace, creating a waterfall-like flow along the inner wall. On one hand, in conjunction with the spherical combustion space, the oxygen flow from each nozzle forms a top-down or vortex-like airflow curtain, strongly disturbing and mixing the flue gas, significantly extending its residence time within the combustion space, and promoting full contact and complete combustion of combustibles and oxygen. On the other hand, it also keeps the inner wall of the furnace under constant airflow protection, reducing the erosion of the furnace wall by the high-temperature flame, extending the furnace's service life, and reducing equipment maintenance and replacement costs.

[0019] The upper and / or middle and / or lower nozzles are configured as a micropore array surrounding the first oxygen supply pipe. This micropore array structure transforms traditional centralized oxygen supply into a multi-porous distributed oxygen supply, forming numerous fine and uniform oxygen jets, thus avoiding high-temperature oxygen-rich zones and localized oxygen-deficient zones caused by excessively high local oxygen concentrations. The oxygen flow from the micropores is finer, allowing for more thorough contact and mixing with solid and gaseous products within the furnace, improving combustion efficiency, ensuring more complete combustion of combustible components, and reducing the generation of harmful gases.

[0020] The micropores constituting the upper nozzle and / or the middle nozzle and / or the lower nozzle are deflected to the same side, causing the gas input from each micropore to form a circumferential cyclone within the combustion space. This same-side deflection design of the micropores ensures that the airflow exiting each nozzle layer has a tangential component in the horizontal direction, thereby inducing the formation of an integral or stratified rotating cyclone within the combustion space. This circumferential cyclone significantly extends the gas's path and residence time within the furnace and promotes gas mixing. The intense rotating flow ensures that even the smallest combustible particles or gas molecules have ample opportunity to react with oxygen and burn completely, greatly improving combustion efficiency and representing a key fluid dynamics method for reducing harmful gas emissions.

[0021] The waste thermal treatment method includes the following steps:

[0022] S1, Pyrolysis: Waste enters the pyrolysis space and pyrolyzes to produce solid and gaseous products;

[0023] S2, Backfire: Solid products are transported to the combustion space via a transfer mechanism and backfire through the upper and middle fire zones;

[0024] S3, Incineration: The solid products after back-burning are incinerated in the lower fire zone.

[0025] This process optimizes the timing of pyrolysis, backcombustion, and incineration through spatial separation and functional zoning: Step S1 creates a controllable oxygen-deficient or low-oxygen environment in an independent pyrolysis space, allowing waste to pyrolyze at a lower temperature to produce combustible gases and solid char, avoiding the large amount of fly ash and complex flue gas composition produced by direct incineration; Step S2 utilizes the hot airflow in the upper and middle fire zones to backcombust the solid products, completing the drying and volatile matter release of the solid residue in a relatively oxygen-deficient environment, allowing combustible gases and solid char to be released in stages. Compared to direct combustion in one step, this stepwise treatment significantly reduces the complex chemical reactions and toxic byproducts caused by drastic changes in combustion conditions; Step S3 thoroughly incinerates the solid residue, which has undergone sufficient backcombustion and has extremely low volatile matter content, in the oxygen-enriched lower fire zone, ensuring complete oxidation of the residue. The entire process, through the orderly progression of "pyrolysis-reverse combustion-incineration", optimizes the treatment of organic components in waste at different stages, in different areas, and under different atmospheres. It achieves full and thorough thermal treatment of waste in the furnace, thereby minimizing the harmful gases generated by improper temperature and atmosphere control in traditional co-incineration processes. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an RFF co-firing waste heat treatment furnace;

[0027] Figure 2 This is a partial structural diagram of the combustion space;

[0028] Figure 3 This is a cross-sectional schematic diagram of the combustion space;

[0029] Figure 4 This is a cross-sectional schematic diagram of the first oxygen supply pipeline;

[0030] Figure 5 This is a schematic diagram of a perforated plate.

[0031] The labels in the diagram represent:

[0032] 1. Combustion space; 11. Upper fire zone; 12. Middle fire zone; 13. Lower fire zone; 14. Rotating furnace plate; 15. Burnout zone; 16. Perforated plate; 161. Holes;

[0033] 2. Pyrolysis space; 2-1. First pyrolysis space; 2-2. Second pyrolysis space; 21. Feed inlet; 21-1. First feed inlet; 21-2. Second feed inlet;

[0034] 3. Transfer mechanism; 3-1. First transfer mechanism; 3-2. Second transfer mechanism;

[0035] 4. Pyrolysis gas nozzle;

[0036] 5. First oxygen supply pipe; 51. Upper nozzle; 52. Middle nozzle; 53. Lower nozzle;

[0037] 6. Thermal radiation heating plate;

[0038] 7. Secondary combustion space;

[0039] 8. Waterfall-style nozzle. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Example

[0042] like Figures 1 to 5 As shown, in this embodiment, the RFF co-firing waste thermal treatment furnace includes a combustion space 1, a pyrolysis space 2, a transfer mechanism 3 for moving solid products generated by pyrolysis into the combustion space 1, and a pyrolysis gas nozzle 4 for transferring gaseous products generated by pyrolysis into the combustion space 1. The combustion space 1 is provided with a first oxygen supply pipe 5, which has an upper nozzle 51, a middle nozzle 52, and a lower nozzle 53 arranged vertically at intervals. The upper nozzle 51 is basically flush with the pyrolysis gas nozzle 4, and an upper fire zone 11 is formed in the area directly opposite it. The middle fire zone 12 is formed in the area directly opposite the middle nozzle 52, and a lower fire zone 13 is formed in the area directly opposite the lower nozzle 53. The heat generated by the upper fire zone 11 and the middle fire zone 12 causes backburning of the solid products, and the lower fire zone 13 causes incineration of the solid products.

[0043] In the RFF co-firing waste heat treatment furnace, R represents pyrolysis, the first F represents reverse combustion, and the second F represents incineration. It is a co-firing process that combines pyrolysis, reverse combustion, and incineration, with the three heat treatment processes complementing each other within the furnace body.

[0044] Specifically, there are two pyrolysis spaces 2: a first pyrolysis space 2-1 and a second pyrolysis space 2-2, located opposite the spherical combustion space 1. The combustion space 1 is adjacent to both the first and second pyrolysis spaces 2-1 and 2-2, respectively. A thermal radiation heating plate 6 separates the combustion space 1 from the first pyrolysis space 2-1 and from the second pyrolysis space 2-2. The thermal radiation heating plate 6 has pyrolysis gas nozzles 4 for transferring gaseous products from pyrolysis to the combustion space 1 and transfer channels for moving solid products from pyrolysis to the combustion space 1. The thermal radiation heating plate 6 is a plate-shaped structure made of thermally conductive material. When the combustion space 1 heats up due to combustion, the thermal radiation heating plate 6 can transfer heat to the first and second pyrolysis spaces 2-1, thereby aiding in the pyrolysis of waste.

[0045] A burner for providing an ignition source is provided on the bottom side of the combustion space 1. A rotating furnace plate 14 for carrying solid products is also provided within the combustion space 1. The solid products are burned on the rotating furnace plate 14, forming a combustion zone. The rotating furnace plate 14 is supported by rollers at the bottom of the combustion space 1 and connected to a drive unit, allowing it to rotate controllably. The rotating furnace plate 14 has a perforated structure with several through holes for ash and slag to pass through. A burnout zone 15 is formed directly below the rotating furnace plate 14, where ash and slag falling through the holes can be temporarily stored. A first oxygen supply pipe 5 is vertically installed at the center of the combustion space 1. This first oxygen supply pipe 5 consists of a radial cluster oxygen supply combustion pipe and a swirling jet sleeve, and its bottom penetrates the rotating furnace plate 14 and connects to an external oxygen source (blower). The first oxygen supply pipe 5 has upper nozzles 51, middle nozzles 52, and lower nozzles 53 spaced apart from top to bottom on its pipe wall. The upper nozzle 51 is basically flush with the pyrolysis gas nozzle 4. The middle nozzle 52 is lower than the upper nozzle 51 and 120mm-200mm higher than the lower nozzle 53. The lower nozzle 53 is 120mm-180mm higher than the rotating furnace plate 14 used to support solid products. The upper nozzle 51 and / or the middle nozzle 52 and / or the lower nozzle 53 are arranged as a group of micropores surrounding the first oxygen supply pipe 5. The micropores that make up the upper nozzle 51 and / or the middle nozzle 52 and / or the lower nozzle 53 are tilted to the same side, so that the gas input from each micropore forms a circumferential cyclone in the combustion space 1. The combustion of the oxygen output from each nozzle and the combustible material is manifested as a concentrated combustion explosion at the microscopic level.

[0046] The inner wall of the combustion space 1 is surrounded by several waterfall-style nozzles 8, and a heat storage body and a perforated plate 16 are provided on top of it. The heat storage body is located on the upper side of the perforated plate 16. Specifically, the heat storage body is in the form of honeycomb ceramic, and the perforated plate 16 is made of cast steel and ceramic composite material. The heat storage body can effectively store the heat of the high-temperature flue gas generated by combustion, and release heat when the flue gas temperature fluctuates to maintain the stability of the temperature at the top of the furnace, avoiding the risk of resynthesis of toxic organic matter due to excessively low temperature; the perforated plate 16 plays a role in equalizing flow and filtering, so that the high-temperature flue gas can pass through the heat storage body evenly, improving the heat storage efficiency, while intercepting some fly ash particles that rise with the flue gas. The synergistic effect of the two significantly improves the thermal stability of the system. More specifically, a number of holes 161 are formed on the side of the perforated plate 16 away from the pyrolysis gas nozzle 4. The holes 161 are set as variable cross-section holes, with the lower half being cylindrical and the upper half being an inverted funnel shape with a smaller bottom and a larger top.

[0047] The RFF co-firing waste thermal treatment furnace also includes a piston-push rod type transfer mechanism 3, which is located on the side of the pyrolysis space 2 opposite to the combustion space 1. There are two transfer mechanisms 3, namely a first transfer mechanism 3-1 and a second transfer mechanism 3-2. There are also two feed inlets 21, namely a first feed inlet 21-1 and a second feed inlet 21-2. The top of the first pyrolysis space 2-1 forms the first feed inlet 21-1. The first transfer mechanism 3-1 connected to the first pyrolysis space 2-1 includes a push rod assembly. The extension and retraction direction of the push rod assembly is directly opposite to the transfer channel. When the push rod assembly is in the retracted state, a space for waste storage is formed in the first pyrolysis space 2-1. When the push rod assembly is in the extended state, it can push the solid products after pyrolysis through the transfer channel and into the combustion space 1. The second transfer mechanism 3-2, connected to the second pyrolysis space 2-2, includes a pusher box and a pusher assembly installed therein. The top of the pusher box forms a second inlet 21-2. The extension and retraction direction of the pusher assembly faces the transfer channel. When the pusher assembly is in the retracted state, a space for storing waste is formed inside the pusher box. When the pusher assembly is in the semi-extended state, it can push the waste into the second pyrolysis space 2-2. When the pusher assembly is in the extended state, it can push the solid products after pyrolysis through the transfer channel and into the combustion space 1. Both the first inlet 21-1 and the second inlet 21-2 can be sealed by baffles.

[0048] The RFF co-firing waste thermal treatment furnace also includes a secondary combustion space 7 adjacent to the second pyrolysis space 2-2. The secondary combustion space 7 is connected to the top of the combustion space 1 and has a built-in second oxygen supply pipe. The secondary combustion space 7 covers the outside of the second pyrolysis space 2-2 and can radiate heat to the second pyrolysis space 2-2.

[0049] In this embodiment, the waste thermal treatment method includes the following steps:

[0050] S1, Pyrolysis: Waste enters pyrolysis space 2 and pyrolyzes to produce solid and gaseous products. This step creates a controllable oxygen-deficient or low-oxygen environment in an independent pyrolysis space, allowing the waste to pyrolyze at a lower temperature to produce combustible gases and solid char, avoiding the large amount of fly ash and complex flue gas composition produced by direct incineration.

[0051] S2, Backcombustion: The solid product is transported to the combustion space 1 via the transfer mechanism 3 and backcombusted in the upper fire zone 11 and the middle fire zone 12. This step utilizes the hot airflow in the upper and middle fire zones 12 to backcombust the solid product, completing the drying and volatilization of the solid residue in a relatively oxygen-deficient environment, so that the combustible gas and solid char are released in stages. Compared with direct combustion in one step, this step-by-step treatment greatly reduces the complex chemical reactions and the generation of toxic byproducts caused by drastic changes in combustion conditions.

[0052] S3, Incineration: The solid products after back-burning are incinerated in the lower fire zone 13; this step thoroughly incinerates the solid residue, which has undergone sufficient back-burning and has extremely low volatile content, in the oxygen-rich lower fire zone 13 to ensure complete oxidation of the residue.

[0053] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A RFF mixed waste heat treatment furnace, characterized by, It includes a combustion space (1), a pyrolysis space (2), a transfer mechanism (3) for moving solid products generated by pyrolysis into the combustion space (1), and a pyrolysis gas nozzle (4) for transferring gaseous products generated by pyrolysis into the combustion space (1). The combustion space (1) is provided with a first oxygen supply pipe (5), and the first oxygen supply pipe (5) is vertically spaced with an upper nozzle (51), a middle nozzle (52) and a lower nozzle (53). The upper nozzle (51) is basically flush with the pyrolysis gas nozzle (4), and an upper fire zone (11) is formed in the area directly opposite it. The middle nozzle (52) forms a middle fire zone (12) in the area directly opposite it, and the lower nozzle (53) forms a lower fire zone (13) in the area directly opposite it. The heat generated by the upper fire zone (11) and the middle fire zone (12) causes backburning of the solid products, and the lower fire zone (13) causes combustion of the solid products.

2. The RFF co-firing waste heat treatment furnace according to claim 1, characterized in that: The combustion space (1) is adjacent to the pyrolysis space (2), and the two are separated by a thermal radiation heating plate (6).

3. The RFF co-firing waste heat treatment furnace according to claim 1, characterized in that: The combustion space (1) contains a rotating furnace plate (14) for carrying solid products.

4. The RFF co-firing waste heat treatment furnace according to claim 3, characterized in that: The rotating furnace plate (14) has through holes for ash and slag to pass through, and a burnout zone (15) is formed below the rotating furnace plate (14).

5. The RFF co-firing waste heat treatment furnace according to claim 1, characterized in that: The combustion space (1) is spherical.

6. The RFF co-firing waste heat treatment furnace according to claim 1, characterized in that: The top of the combustion space (1) is provided with a perforated plate (16), and the perforated plate (16) has a number of holes (161) on the side away from the pyrolysis gas nozzle (4).

7. The RFF co-firing waste heat treatment furnace according to claim 6, characterized in that: The hole (161) is configured as a variable cross-section hole, with its lower half being cylindrical and its upper half being an inverted funnel shape with a smaller lower section and a larger upper section.

8. The RFF co-firing waste heat treatment furnace according to claim 1, characterized in that: The top of the pyrolysis space (2) or the transfer mechanism (3) is formed with a closable inlet (21).

9. The RFF co-firing waste heat treatment furnace according to claim 1, characterized in that: The transfer mechanism (3) is configured as a piston push rod.

10. The RFF co-firing waste heat treatment furnace according to claim 3, characterized in that: The first oxygen supply pipe (5) is vertically set in the center of the combustion space (1), and its bottom passes through the rotating furnace plate (14) and is connected to the external oxygen source.

11. The RFF co-firing waste heat treatment furnace according to claim 1, characterized in that: The RFF co-firing waste heat treatment furnace also includes a secondary combustion space (7) adjacent to the pyrolysis space (2). The secondary combustion space (7) is connected to the top of the pyrolysis space (2) and covers the outside of the pyrolysis space (2), and can radiate heat to the pyrolysis space (2).

12. The RFF co-firing waste heat treatment furnace according to claim 5, characterized in that: The RFF co-firing waste heat treatment furnace also includes several waterfall-style nozzles (8) arranged around the inner wall of the combustion space (1).

13. The RFF co-firing waste heat treatment furnace according to claim 1, characterized in that: The upper nozzle (51) and / or the middle nozzle (52) and / or the lower nozzle (53) are configured as a group of micropores surrounding the first oxygen supply pipe (5).

14. The RFF co-firing waste heat treatment furnace according to claim 13, characterized in that: The micropores that make up the upper nozzle (51) and / or the micropores that make up the middle nozzle (52) and / or the micropores that make up the lower nozzle (53) are deflected to the same side, so that the gas input from each micropore forms a circumferential cyclone in the combustion space (1).

15. A waste heat treatment method applicable to the RFF co-firing waste heat treatment furnace according to any one of claims 1-14, characterized in that, Includes the following steps: S1, pyrolysis: The waste enters the pyrolysis space (2) and pyrolyzes to produce solid products and gaseous products; S2, Backfire: The solid product is transported to the combustion space (1) via the transfer mechanism (3) and backfires through the upper fire zone (11) and the middle fire zone (12); S3, Incineration: The solid products after backburning are incinerated in the lower fire zone (13).

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