A hazardous waste incineration and melting system and its incineration and melting method

Abstract

The present invention belongs to the technical field of hazardous waste treatment, and particularly relates to a hazardous waste incineration and melting system and an incineration and melting method thereof. The hazardous waste incineration and melting system includes an incineration rotary kiln, a secondary combustion chamber, and a melting chamber; the outlet of the incineration rotary kiln is connected to the secondary combustion chamber; a flue gas outlet is provided at the top of the secondary combustion chamber, and a slag outlet is provided at the bottom and is connected to the melting chamber; the flue gas generated by the melting chamber enters the secondary combustion chamber through the slag outlet. In this system, the movement direction of the kiln slag is opposite to that of the high-temperature flue gas, and the two can be in full contact, which can not only increase the temperature of the kiln slag, enabling the residual combustibles to be further burned out, but also completely decompose the harmful substances such as dioxins therein.

Description

Technical Field

[0001] The present invention belongs to the technical field of hazardous waste treatment, and particularly relates to a hazardous waste incineration and melting system and an incineration and melting method thereof. Background Art

[0002] In recent years, with the rapid development of the national economy, the annual production of hazardous waste has also increased significantly. The treatment processes of hazardous waste mainly include incineration, physical and chemical treatment, stabilization / solidification, and safe landfill. Among them, the incineration process is used to dispose of hazardous waste with relatively high calorific value. Hazardous waste can be completely decomposed at high temperatures to achieve the purpose of completely eliminating the hazard source. At the same time, the incineration process can significantly reduce the volume and weight of hazardous waste. Generally, the volume can be reduced by 80-90%, and the weight can be reduced by about 70-80%. In the current situation where landfill sites are becoming increasingly scarce, hazardous waste incineration can significantly reduce the landfill cost. Therefore, hazardous waste incineration has become the main way of hazardous waste treatment.

[0003] At present, the waste generated after the incineration disposal of high-calorific value hazardous waste can be divided into two categories: slag and fly ash. The incineration ash residue accounts for about 30% of the raw material input into the furnace, of which the slag is 25-30% and the fly ash is 2-5%. Hazardous waste incineration ash residue contains pollution components such as heavy metals and dioxins. If not properly treated, it will cause serious secondary pollution to the human living environment. With the increasing shortage of safe landfill sites and the increasing landfill cost, the vitrification technology that can completely eliminate pollution components such as heavy metals and dioxins has become a research hotspot in the current industry in China. Summary of the Invention

[0004] The present invention provides a hazardous waste incineration and melting system and an incineration and melting method thereof.

[0005] Specifically, the present invention provides the following technical solutions:

[0006] A hazardous waste incineration and melting system includes an incineration rotary kiln, a secondary combustion chamber, and a melting chamber;

[0007] The outlet of the incineration rotary kiln is connected to the secondary combustion chamber;

[0008] The top of the secondary combustion chamber is provided with a flue gas outlet, and the bottom is provided with a kiln slag outlet and is connected to the melting chamber;

[0009] The flue gas generated by the melting chamber enters the secondary combustion chamber through the kiln slag outlet.

[0010] Preferably, in the above-mentioned hazardous waste incineration and melting system, the melting chamber is arranged below the secondary combustion chamber.

[0011] Preferably, in the above-mentioned hazardous waste incineration and melting system, the incineration rotary kiln is inclined downward as a whole towards the secondary combustion chamber, with an inclination angle of 1° to 3° with the horizontal plane.

[0012] Preferably, in the above-mentioned hazardous waste incineration and melting system, the melting chamber is a reverberatory furnace, and more preferably a reverberatory furnace fueled by natural gas.

[0013] Preferably, in the above-mentioned hazardous waste incineration and melting system, it further includes a slag discharging system. The slag discharging system includes a water slag pool and a slag skimmer. The water slag pool is connected to the slag discharging port of the melting chamber, and the slag skimmer is used to lift and discharge the residue from the water slag pool.

[0014] Preferably, in the above-mentioned hazardous waste incineration and melting system, it further includes a waste heat boiler, and the flue gas outlet of the secondary combustion chamber is connected to the waste heat boiler. The high-temperature flue gas coming out of the secondary combustion chamber enters the waste heat boiler to generate high-temperature steam through heat exchange for production and living use.

[0015] Preferably, in the above-mentioned hazardous waste incineration and melting system, it further includes a flue gas quenching system and a flue gas purification system. The flue gas outlet of the waste heat boiler is connected to the flue gas inlet of the flue gas quenching system, and the flue gas outlet of the flue gas quenching system is connected to the flue gas purification system.

[0016] Preferably, in the above-mentioned hazardous waste incineration and melting system, the flue gas purification system includes a dry deacidification tower, a bag filter, a wet deacidification tower, a induced draft fan and a chimney connected in sequence.

[0017] The present invention also provides an incineration and melting method using the above-mentioned hazardous waste incineration and melting system, including the following steps:

[0018] Feed hazardous waste, auxiliary materials and fly ash into the incineration rotary kiln through a feeding device for incineration. The generated flue gas enters the secondary combustion chamber through the first flue gas inlet, and the toxic and harmful substances in the flue gas are eliminated by direct combustion in the secondary combustion chamber;

[0019] The low slag generated by the incineration rotary kiln enters the melting chamber, and is formed into a high-temperature melt through melting treatment in the melting chamber. The high-temperature melt enters the water slag pool through the slag discharging port of the melting chamber, and is discharged as vitreous slag by the slag skimmer after water quenching;

[0020] The flue gas generated by the melting chamber enters the secondary combustion chamber through the second flue gas inlet.

[0021] Preferably, in the above-mentioned incineration and melting method, the addition amount of the auxiliary materials is 4-7wt% of the total amount of the materials fed into the furnace;

[0022] By weight percentage, the auxiliary materials include 20-40% of coal gangue, 30-50% of crushed glass, 15-20% of quartz sand, and 10-15% of quicklime. The auxiliary materials can provide a part of heat and also reduce coking on the inner wall of the rotary kiln.

[0023] Preferably, in the above incineration and melting method, the fly ash is the fly ash captured by the waste heat boiler, the flue gas quenching system, and the bag filter.

[0024] Preferably, in the above incineration and melting method, the temperature of the secondary combustion chamber is 1100-1200 °C, and the flue gas stays in the secondary combustion chamber for more than 2 seconds to completely incinerate toxic and harmful substances.

[0025] Preferably, in the above incineration and melting method, the temperature of the melting chamber is 1350-1500 °C.

[0026] Preferably, in the above incineration and melting method, the flue gas temperature generated in the melting chamber is 1250-1350 °C and directly enters the secondary combustion chamber, which can greatly reduce the energy consumption required for heating the secondary combustion chamber.

[0027] The beneficial effects achieved by the present invention:

[0028] A hazardous waste incineration and melting system and its incineration and melting method provided by the present invention add fly ash, auxiliary materials, and hazardous waste to be incinerated through a feeding device into an incineration rotary kiln. Various materials are fully mixed and heated and incinerated in the incineration rotary kiln. The formed hot slag and flue gas enter the secondary combustion chamber from the tail of the rotary kiln. The slag is discharged from the bottom discharge port of the secondary combustion chamber and directly enters the melting furnace. The flue gas generated by the melting furnace is conveyed to the secondary combustion chamber in the direction opposite to the slag feeding direction. The temperature of the slag discharged from the rotary kiln is 700-900 °C, and the temperature of the high-temperature flue gas generated in the melting furnace is 1250-1350 °C. The slag and the high-temperature flue gas move in opposite directions and can fully contact. Not only can the temperature of the slag be increased to further burn out the residual combustibles, but also the harmful substances such as dioxins can be completely decomposed. After heat exchange with the slag, the flue gas temperature is appropriately reduced to avoid direct contact between the high-temperature flue gas and the tail of the rotary kiln and extend the equipment life.

[0029] At the same time, the high-temperature flue gas generated by the melting furnace enters the secondary combustion chamber, which can reduce the fuel consumption required to maintain a high temperature above 1100 °C in the secondary combustion chamber. It not only improves the heat utilization rate but also ensures the treatment effect, realizing the harmlessness and resource utilization of hazardous waste. The incineration-melting solidification integrated design is compact, with high hazardous waste treatment efficiency and reduced investment costs. Description of the Drawings

[0030] Figure 1 It is the process flow diagram of Embodiment 1 of the present invention;

[0031] Among them, 1 is the silo, 2 is the rotary incinerator, 3 is the secondary combustion chamber, 4 is the melting chamber, 5 is the granulated slag pond, 6 is the waste heat boiler, 7 is the quench tower, 8 is the dry acid scrubber, 9 is the bag filter, 10 is the wet acid scrubber, 11 is the induced draft fan, and 12 is the chimney.

[0032] Figure 2 It is the XRD pattern of the vitreous slag obtained in Example 1 of the present invention. Specific embodiments

[0033] The following examples are used to illustrate the present invention, but do not limit the scope of the present invention. For those without specific technologies or conditions noted in the examples, they are carried out according to the technologies or conditions described in the literature in this field or according to the product specifications.

[0034] In the description of the present invention, unless otherwise stated, the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0035] In the following examples, for those instruments and the like without indicating the manufacturer, they are all conventional products that can be obtained through regular channels. The methods are all conventional methods unless otherwise specified, and the raw materials can all be obtained from public commercial channels unless otherwise specified.

[0036] Example 1

[0037] (1) Feeding raw materials into the kiln

[0038] As Figure 1 shown, fly ash, auxiliary materials and hazardous waste from chemical industrial parks that need to be incinerated are added to the rotary incinerator 2 through the silo 1. The addition amount of auxiliary materials is 4% of the amount of materials entering the furnace, and the particle size is controlled to be 0.5 - 3 cm. The addition of auxiliary materials is beneficial to the melting of the incineration slag of hazardous waste and the formation of glass bodies;

[0039] The proportion of coal gangue in the auxiliary materials is 30%, the proportion of broken glass is 40%, the proportion of quartz sand is 20%, and the proportion of quicklime is 10%.

[0040] (2) Incineration in the kiln

[0041] The rotary incinerator 2 is placed obliquely with an inclination angle of 2 degrees, so that the materials entering the furnace can be continuously and fully dried and incinerated in the kiln.

[0042] (3) Melting + cooling

[0043] The tail of the rotary incinerator is connected to the secondary combustion chamber 3. The flue gas and slag generated by incineration enter the secondary combustion chamber 3. The top of the secondary combustion chamber 3 is provided with a flue gas outlet, and the bottom is provided with a slag outlet and is connected to the melting chamber 4;

[0044] The slag discharged from the slag outlet of the secondary combustion chamber 3 directly enters the melting chamber 4; a loose slag layer with a thickness of 10 - 30 cm is maintained in the pipeline connecting the slag outlet of the secondary combustion chamber 3 and the melting chamber 4. The flue gas temperature generated during the melting process is 1250 - 1350 °C, which is transported to the secondary combustion chamber 3 in the direction opposite to the slag feeding direction. During the process of passing through the slag layer, the slag is heated, and the combustibles and dioxins contained in the slag are decomposed; the slag layer cannot be too thick, otherwise it will cause an increase in the pressure inside the melting chamber and affect the normal production of the melting chamber. If the slag layer is too thin, the heating and decomposition effects will be affected;

[0045] The melting chamber 4 selects a reverberatory furnace fueled by natural gas. During the softening, melting, and homogenization processes at 1350 - 1500 °C, a high-temperature melt is finally formed; the high-temperature melt is further discharged into the granulated slag pond 5 and is discharged by a slag scraper after water quenching to form a vitreous slag with a dense structure, realizing the stable solidification of heavy metals in the molten slag.

[0046] The cooled slag is crushed, and the metallic iron in it is recovered by magnetic separation and can be used as raw material for steelmaking; the remaining part is ground and can be used as a cement admixture.

[0047] (4) Flue gas treatment

[0048] 1) The flue gas entering the secondary combustion chamber 3 stays at a high temperature of 1100 - 1200 °C for more than 2 seconds to completely incinerate toxic and harmful substances;

[0049] 2) The high-temperature flue gas coming out from the top of the secondary combustion chamber 3 enters the waste heat boiler 6 to generate high-temperature steam through heat exchange for production and living use. The flue gas temperature at the outlet of the waste heat boiler 6 is 500 - 550 °C;

[0050] 3) The flue gas at the outlet of the waste heat boiler 6 enters the quench tower 7 and is quenched to 200 °C. After passing through the dry desulfurization tower 8, the flue gas enters the bag filter 9; the dry desulfurization tower 8 is equipped with an activated carbon powder pipeline injection adsorption device;

[0051] 4) The flue gas is purified by the bag filter 9 and then enters the wet desulfurization tower 10, and then is discharged into the atmosphere through the chimney 12 with a height of 60 meters by the induced draft fan 11, without generating harmful gases and white smoke;

[0052] 5) The fly ash captured by the waste heat boiler 6, the quench tower 7, and the bag filter 9 is returned to the silo 1.

[0053] Figure 2 This is the XRD pattern of the vitreous slag obtained in Example 1 of the present invention. The result analysis shows that the glass phase content in the vitreous slag is 93%, meeting the requirements.

[0054] Using vitrified slag as the dried test sample, prepare the acid leaching solution according to the methods specified in 6.2 and 7 of GB / T 30810-2014, and conduct the detection of each harmful substance according to the provisions of GB / T 30810. The acid dissolution rate of the vitrified slag is 2.75%, meeting the requirements of the vitrified product. Table 1 shows the heavy metal leaching concentrations in the vitrified slag.

[0055] Table 1 Heavy Metal Leaching Concentrations

[0056] Hazardous substance items Copper Zinc Cadmium Lead Chromium Nickel Arsenic Manganese Glass-like slag (mg / L) 0.35 0.43 0.02 0.15 0.12 0.08 0.05 0.28 Limit value (mg / L) ≤1.0 ≤1.0 ≤0.03 ≤0.3 ≤0.2 ≤0.2 ≤0.1 ≤1.0

[0057] As can be seen from Table 1, the heavy metal leaching concentrations of the vitrified slag meet the requirements, achieving the stable solidification of heavy metals in the slag.

[0058] Example 2

[0059] (1) Feeding raw materials into the kiln

[0060] Add fly ash, auxiliary materials, and hazardous waste from chemical industrial parks that need to be incinerated into the incineration rotary kiln through a silo. The addition amount of auxiliary materials is 5% of the amount of materials fed into the furnace, and the particle size is controlled at 0.5 - 3 cm. The addition of auxiliary materials is beneficial to the melting of the incineration slag of hazardous waste and the formation of glass bodies;

[0061] The proportion of coal gangue in the auxiliary materials is 20%, the proportion of broken glass is 50%, the proportion of quartz sand is 15%, and the proportion of quicklime is 15%.

[0062] (2) Incineration in the kiln

[0063] The incineration rotary kiln is placed obliquely with an inclination angle of 2 degrees, enabling the materials fed into the furnace to be continuously and fully dried and incinerated in the kiln.

[0064] (3) Melting + Cooling

[0065] The tail of the incineration rotary kiln is connected to the secondary combustion chamber. The flue gas and slag generated by incineration enter the secondary combustion chamber. The top of the secondary combustion chamber is provided with a flue gas outlet, and the bottom is provided with a slag outlet and is connected to the melting chamber;

[0066] The slag is discharged from the slag outlet of the secondary combustion chamber and directly enters the melting chamber; there is a loose slag layer with a thickness of 10 - 30 cm maintained in the pipeline connecting the slag outlet of the secondary combustion chamber to the melting chamber. The temperature of the flue gas generated during the melting process is 1250 - 1350 °C, and it is transported to the secondary combustion chamber in the direction opposite to the slag feeding direction. During the process of passing through the slag layer, the slag is heated, and the combustibles and dioxins contained in the slag are decomposed;

[0067] The melting chamber selects a reverberatory furnace fueled by natural gas. During the softening, melting, and homogenization processes at 1350 - 1500 °C, a high-temperature melt is finally formed. The high-temperature melt is further discharged into a water slag pond, and after water quenching, it is discharged by a slag scraper to form a glassy slag with a dense structure, realizing the stable solidification of heavy metals in the molten slag.

[0068] The cooled slag is crushed, and the metallic iron in it is recovered by magnetic separation and can be used as raw material for steelmaking. The remaining part is ground and can be used as a cement admixture.

[0069] (4) Flue gas treatment

[0070] 1) The flue gas entering the secondary combustion chamber stays at a high temperature of 1100 - 1200 °C for more than 2 seconds, completely incinerating toxic and harmful substances.

[0071] 2) The high-temperature flue gas coming out from the top of the secondary combustion chamber enters a waste heat boiler to generate high-temperature steam through heat exchange for production and living use. The flue gas temperature at the outlet of the waste heat boiler is 500 - 550 °C.

[0072] 3) The flue gas at the outlet of the waste heat boiler enters a quench tower and is quenched to 200 °C. After passing through a dry acid scrubber, the flue gas enters a bag filter. The dry acid scrubber is equipped with an activated carbon powder pipeline injection adsorption device.

[0073] 4) The flue gas is purified by the bag filter and then enters a wet acid scrubber, and then is discharged into the atmosphere through a 60-meter-high chimney by an induced draft fan, without generating harmful gases or white smoke.

[0074] 5) The fly ash captured by the waste heat boiler, quench tower, and bag filter is returned to bin 1.

[0075] The heavy metal leaching concentration of the glassy slag obtained in Example 2 meets the requirements, realizing the stable solidification of heavy metals in the molten slag.

[0076] Example 3

[0077] (1) Raw materials entering the kiln

[0078] The fly ash, auxiliary materials, and hazardous waste from a chemical industrial park that need to be incinerated are added to an incineration rotary kiln through a bin. The addition amount of the auxiliary materials is 7% of the amount of the materials entering the furnace, and the particle size is controlled at 0.5 - 3 cm. The addition of the auxiliary materials is beneficial to the melting of the incineration slag of the hazardous waste and the formation of glass bodies.

[0079] The proportion of coal gangue in the auxiliary materials is 40%, the proportion of broken glass is 30%, the proportion of quartz sand is 20%, and the proportion of quicklime is 10%.

[0080] (2) Incineration in the kiln

[0081] The incineration rotary kiln is placed obliquely with an inclination angle of 2 degrees, enabling the materials fed into the furnace to be continuously and fully dried and incinerated in the kiln.

[0082] (3) Melting + Cooling

[0083] The tail of the incineration rotary kiln is connected to the secondary combustion chamber. The flue gas and slag generated by incineration enter the secondary combustion chamber. A flue gas outlet is provided at the top of the secondary combustion chamber, and a slag outlet is provided at the bottom and connected to the melting chamber;

[0084] The slag is discharged from the slag outlet of the secondary combustion chamber and directly enters the melting chamber; a loose slag layer with a thickness of 10 - 30 cm is maintained in the pipeline connecting the slag outlet of the secondary combustion chamber to the melting chamber. The temperature of the flue gas generated during the melting process is 1250 - 1350 °C and is transported to the secondary combustion chamber in the direction opposite to the slag feeding direction. During the process of passing through the slag layer, the slag is heated, and the combustibles and dioxins contained in the slag are decomposed;

[0085] The melting chamber selects a reverberatory furnace fueled by natural gas. During the softening, melting, and homogenization processes at 1350 - 1500 °C, a high-temperature melt is finally formed; the high-temperature melt is further discharged into a water slag pond, and after water quenching, it is discharged by a slag scraper to form a glassy slag with a dense structure, realizing the stable solidification of heavy metals in the molten slag.

[0086] The cooled slag is crushed, and the metallic iron in it is recovered by magnetic separation and can be used as a raw material for steelmaking; the remaining part is ground and can be used as a cement admixture.

[0087] (4) Flue Gas Treatment

[0088] 1) The flue gas entering the secondary combustion chamber stays at a high temperature of 1100 - 1200 °C for more than 2 seconds, completely incinerating the toxic and harmful substances;

[0089] 2) The high-temperature flue gas coming out of the top of the secondary combustion chamber enters the waste heat boiler to generate high-temperature steam through heat exchange for production and domestic use. The temperature of the flue gas at the outlet of the waste heat boiler is 500 - 550 °C;

[0090] 3) The flue gas at the outlet of the waste heat boiler enters the quench tower and is quenched to 200 °C. After passing through the dry deacidification tower, the flue gas enters the bag filter; the dry deacidification tower is equipped with an activated carbon powder pipeline injection adsorption device;

[0091] 4) The flue gas is purified by the bag filter and then enters the wet deacidification tower, and then is discharged into the atmosphere through a 60 - meter-high chimney by an induced draft fan without generating harmful gases and white smoke;

[0092] 5) The fly ash captured by the waste heat boiler, quench tower, and bag filter is returned to the silo 1.

[0093] The heavy metal leaching concentration of the vitreous slag obtained in Example 3 meets the requirements, achieving the stable solidification of heavy metals in the molten slag.

[0094] Comparative Example 1

[0095] The difference between Comparative Example 1 and Example 1 is that:

[0096] A flue gas inlet different from the slag outlet of the kiln is provided at the bottom of the secondary combustion chamber of Comparative Example 1, and a flue gas outlet is provided at the top of the melting chamber and is connected to the flue gas inlet at the bottom of the secondary combustion chamber. The high-temperature flue gas generated in the melting chamber enters the secondary combustion chamber through the flue gas inlet and does not contact the kiln slag.

[0097] Test Example

[0098] According to the method for measuring the loss on ignition specified in GB18484, the kiln slag entering the melting chamber from the rotary kiln in Example 1 was detected. The loss on ignition of the kiln slag was less than 0.5%. The dioxin content in the kiln slag was less than 10 ng TEQ / kg, and the melting rate of the melting chamber was 1.5 t / (m 2 ·d).

[0099] According to the method for measuring the loss on ignition specified in GB18484, the kiln slag entering the melting chamber from the rotary kiln in Comparative Example 1 was detected. The loss on ignition of the kiln slag was 2.5 - 4.5%, the dioxin content in the kiln slag was 300 - 550 ng TEQ / kg, and the melting rate of the melting chamber was 1.2 t / (m 2 ·d).

[0100] It can be seen from this that compared with Comparative Example 1, the residual combustibles in Example 1 are further burned out, the dioxin is completely decomposed, and the melting rate of the melting chamber can be increased by 25%, with an obvious improvement.

[0101] Although the present invention has been described in detail above with general descriptions, specific embodiments and tests, based on the present invention, some modifications or improvements can be made to it, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A hazardous waste incineration and melting system, characterized in that It includes an incineration rotary kiln, a secondary combustion chamber, and a melting chamber; The outlet of the incineration rotary kiln is connected to the secondary combustion chamber; The top of the secondary combustion chamber is provided with a flue gas outlet, and the bottom is provided with a slag outlet and is connected to the melting chamber. The melting chamber is arranged below the secondary combustion chamber, and the slag outlet is communicated with the melting chamber through a pipeline; The flue gas generated by the melting chamber enters the secondary combustion chamber through the pipeline and then through the slag outlet. A slag layer with a thickness of 10 - 30 cm is maintained in the pipeline.

2. The hazardous waste incineration and melting system according to claim 1, wherein The whole incineration rotary kiln slopes downward in the direction of the secondary combustion chamber, with an inclination angle of 1° - 3° to the horizontal plane.

3. The hazardous waste incineration and melting system according to claim 1 or 2, characterized in that, The melting chamber is a reverberatory furnace.

4. The hazardous waste incineration and melting system according to claim 1 or 2, characterized in that, It also includes a slag discharging system, which includes a water slag pool and a slag skimmer. The water slag pool is connected to the slag discharging port of the melting chamber, and the slag skimmer is used to lift and discharge the residue from the water slag pool.

5. The hazardous waste incineration and melting system according to claim 1 or 2, characterized in that, It also includes a waste heat boiler, and the flue gas outlet of the secondary combustion chamber is connected to the waste heat boiler.

6. The hazardous waste incineration and melting system according to claim 5, wherein, It also includes a flue gas quenching system and a flue gas purification system. The flue gas outlet of the waste heat boiler is connected to the flue gas inlet of the flue gas quenching system, and the flue gas outlet of the flue gas quenching system is connected to the flue gas purification system.

7. The hazardous waste incineration and melting system according to claim 6, wherein The flue gas purification system includes a dry desulfurization tower, a bag filter, a wet desulfurization tower, a induced draft fan, and a chimney connected in sequence.

8. A method for incineration and melting of a hazardous waste incineration and melting system according to any one of claims 1-7, characterized in that, It includes the following steps: The hazardous waste, auxiliary materials, and fly ash enter the incineration rotary kiln through the feeding device for incineration, and the generated flue gas and slag enter the secondary combustion chamber; The flue gas eliminates the toxic and harmful substances in the flue gas through direct combustion in the secondary combustion chamber; The slag is discharged from the slag outlet of the secondary combustion chamber and directly enters the melting chamber. In the melting chamber, it forms a high-temperature melt through melting treatment. The high-temperature melt enters the water slag pool through the slag discharging port of the melting chamber, and after water quenching, the vitreous slag is discharged by the slag skimmer; The flue gas generated by the melting chamber enters the secondary combustion chamber through the slag outlet.

9. The incineration and melting method according to claim 8, wherein The addition amount of the auxiliary materials is 4 - 7 wt% of the total amount of the materials entering the furnace; By weight percentage, the auxiliary materials include 20 - 40% of coal gangue, 30 - 50% of broken glass, 15 - 20% of quartz sand, and 10 - 15% of quicklime.

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