Waste incineration system and method

Abstract

The waste incineration system comprises a waste feeding hopper, a combustion chamber and a slag discharging opening, a fire grate and a combustion partition plate are arranged in the combustion chamber, the combustion partition plate divides the combustion chamber into a first combustion chamber and a second combustion chamber, the first combustion chamber communicates with a first smoke channel, and the second combustion chamber communicates with a second smoke channel; the tail end of the first flue gas channel communicates with the tail end of the second flue gas channel through a mixing channel, at least one or more evaporators and a first water cooling pipeline are arranged in the first flue gas channel, and the evaporators and the first water cooling pipeline are used for generating saturated steam; at least one superheater is arranged in the second flue gas channel, and the superheaters utilize waste heat of low-chlorine flue gas generated by garbage combustion in the second combustion chamber to heat saturated steam to form high-temperature and high-pressure steam for power generation or other utilization. The invention further discloses a waste incineration method. The influence of chlorine-containing compounds in flue gas on the superheater can be effectively reduced, high-efficiency utilization of flue gas waste heat is achieved, and the power generation capacity per ton of garbage is improved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of garbage combustion, and in particular to a garbage incineration system and method. Background Art

[0002] Garbage is a pollutant produced by human production activities. A large amount of waste is extremely harmful to the environment, mainly manifested in the occupation of land, pollution of the atmosphere, soil and water bodies, and the harm caused is difficult to recover. The existing urban domestic waste disposal technology is low and domestic waste treatment requires a lot of money. The use of waste incineration technology solves the above problems. At the same time, the high-temperature flue gas generated in the waste incineration process can be used as the main energy source to generate high-pressure saturated steam to the generator set for power generation. However, due to the complex composition of garbage, a certain concentration of chlorine-containing flue gas will be generated during combustion, which will continue to cause corrosion when the superheater, the core equipment for generating high-temperature and high-pressure steam, is heated, affecting the stable operation of the equipment and system, and also limiting the steam temperature generated by the superheater, making it impossible to further increase the waste power generation rate.

[0003] According to the analysis of chlorine production during the waste incineration process, in traditional waste incineration systems, a large amount of chlorine-containing compounds will be produced when the waste is dried and the initial combustion stage reaches the range of 200 to 500 degrees Celsius. This type of flue gas will be mixed with the flue gas with low chlorine content at the rear end of the combustion. During the process of flue gas energy utilization, it will continue to corrode and accumulate ash on the high-temperature superheater, ultimately affecting the life of the superheater and the heat transfer efficiency, increasing the risk of system operation, and even leading to shutdown for maintenance.

[0004] At present, in the prior art, some practitioners have optimized the surface materials of the superheater to relatively reduce the corrosion efficiency. However, this improvement plan will affect the flue gas heat transfer efficiency and the cost of the transformation is too high. How to effectively reduce the impact of chlorine-containing compounds in the flue gas on the superheater in the waste incineration system, improve the thermal efficiency of the waste incineration system, increase the power generation per ton of waste, and reduce the system maintenance cost are technical problems that need to be solved urgently by technical personnel in this field. Summary of the invention

[0005] In view of the technical problems existing in the prior art, the present invention provides a garbage incineration system and method which can effectively reduce the impact of chlorine-containing compounds in flue gas on the superheater in the garbage incineration system, realize efficient utilization of flue gas waste heat, and increase the power generation per ton of garbage.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A garbage incineration system comprises a garbage hopper, a combustion chamber and a slag discharge port. A grate and a combustion baffle are arranged in the combustion chamber. The combustion baffle divides the combustion chamber into a first combustion chamber and a second combustion chamber. The first combustion chamber is connected to a first flue gas channel, and the second combustion chamber is connected to a second flue gas channel. The end of the first flue gas channel is connected to the end of the second flue gas channel through a mixing channel. At least one evaporator and a first water-cooling pipe are arranged in the first flue gas channel. The evaporator and the first water-cooling pipe are used to generate saturated steam. At least one superheater is arranged in the second flue gas channel. The superheater uses the waste heat of low-chlorine flue gas generated by the combustion of garbage in the second combustion chamber to heat the saturated steam to form high-temperature and high-pressure steam for power generation or other uses.

[0007] As a further improvement of the present invention: the superheater includes a high-temperature superheater, a medium-temperature superheater and a low-temperature superheater.

[0008] As a further improvement of the present invention: an economizer and a flue gas induced draft fan are provided in the mixing channel, the flue gas induced draft fan is used to introduce the flue gas generated by the first combustion chamber and the second combustion chamber into the first flue gas channel and the second flue gas channel respectively, and the economizer absorbs the waste heat of the mixed flue gas and is used to preheat the boiler feed water before entering the evaporator.

[0009] As a further improvement of the present invention: a second water cooling pipe is provided in the combustion baffle.

[0010] As a further improvement of the present invention: the grate is arranged in a stepped manner.

[0011] The present invention discloses a waste incineration method based on the waste incineration system as described above, the steps comprising: Step S1: sending garbage into the combustion chamber; Step S2: The garbage passes through the first combustion chamber and the second combustion chamber in sequence for combustion under the action of the grate; Step S3: The high-chlorine flue gas generated by the combustion of the garbage in the first combustion chamber is introduced into the first flue gas channel, and enters the mixing channel after passing through the evaporator. The saturated steam generated by the evaporator and the first water-cooling pipe is used for the superheater of the second flue gas channel to generate high-temperature and high-pressure steam; Step S4: The low-chlorine flue gas generated by the combustion of garbage in the second combustion chamber is introduced into the second flue gas channel. The superheater in the second flue gas channel uses the waste heat of the low-chlorine flue gas to heat the saturated steam to form high-temperature and high-pressure steam for power generation or other uses.

[0012] As a further improvement of the present invention, it also includes step S5: mixing the flue gas after passing through the first flue gas channel and the second flue gas channel, and then sending the mixed flue gas to the economizer, which is used to preheat the boiler feed water before entering the evaporator.

[0013] As a further improvement of the present invention: the superheater in step S4 includes a high-temperature superheater, a medium-temperature superheater and a low-temperature superheater, and the saturated steam passes through the low-temperature superheater, the medium-temperature superheater and the high-temperature superheater in sequence to be heated step by step.

[0014] The present invention provides a method based on the waste incineration system as described above, the steps comprising: Step S1: sending garbage into the combustion chamber; Step S2: The garbage passes through the first combustion chamber and the second combustion chamber in sequence for combustion under the action of the grate; Step S3: The high-chlorine flue gas generated by the combustion of the garbage in the first combustion chamber is introduced into the first flue gas channel, and enters the mixing channel after passing through the evaporator. The saturated steam generated by the evaporator and the first water-cooling pipe enters the second flue gas channel. The generated saturated steam is used for the superheater unit to generate high-temperature and high-pressure steam. Step S4: The low-chlorine flue gas generated by the combustion of garbage in the second combustion chamber is introduced into the second flue gas channel. The superheater in the second flue gas channel uses the waste heat of the low-chlorine flue gas to heat the saturated steam to form high-temperature and high-pressure steam for power generation or other uses. As a further improvement of the present invention, it also includes step S5: mixing the flue gas after passing through the first flue gas channel and the second flue gas channel, and then sending the mixed flue gas to the economizer, which is used to preheat the boiler feed water before entering the evaporator.

[0015] As a further improvement of the present invention: the superheater in step S4 includes a high-temperature superheater, a medium-temperature superheater and a low-temperature superheater, and the saturated steam passes through the low-temperature superheater, the medium-temperature superheater and the high-temperature superheater in sequence to be heated step by step.

[0016] Compared with the prior art, the advantages of the present invention are: 1. The garbage incineration system of the present invention is designed with a combustion baffle, which divides the traditional garbage incineration chamber into two incineration chambers: one is a first combustion chamber that can produce flue gas containing chlorine compounds with a higher concentration, and the other is a second combustion chamber that produces flue gas containing chlorine compounds with a lower concentration. The first combustion chamber is connected to the first flue gas channel, and the second combustion chamber is connected to the second flue gas channel. An evaporator and a first water-cooling pipe are arranged in the first flue gas channel. The evaporator and the first water-cooling pipe can fully absorb the waste heat in the high-chlorine flue gas generated by the combustion of garbage in the first combustion chamber to produce saturated steam. Since the working medium temperature of the evaporation heating surface of the evaporator is relatively low, the temperature of its tube wall does not reach the temperature range where chlorine compounds cause high-speed corrosion, so the overall corrosion degree is relatively light. In the second flue gas channel, since the flue gas flowing through is high-temperature flue gas with a low concentration of chlorine compounds, the corrosion rate of the high-temperature superheater is greatly reduced. At the same time, the superheater can more effectively utilize the waste heat of the high-temperature flue gas with lower chlorine content, and produce high-temperature and high-pressure steam with higher parameters than traditional waste incineration superheaters, thereby realizing the efficient utilization of flue gas waste heat and effectively increasing the power generation per ton of waste.

[0017] 2. In the waste incineration system of the present invention, the ends of the first flue gas channel and the second flue gas channel are connected by means of a mixing channel. The flue gas treated by the first and second flue gas channels will be mixed again in the mixing channel. In the mixing channel, an economizer is provided, which can absorb the waste heat of the mixed flue gas and preheat the boiler feed water before entering the evaporator. The saturated steam generated by the evaporator is converted into high-temperature and high-pressure steam after being heated again by the superheater, thereby realizing the secondary utilization of the waste heat of the mixed flue gas, greatly improving the thermal efficiency of the system. Compared with conventional waste incineration systems, the waste incineration system of the present invention innovatively differentiates and utilizes the flue gas generated at different combustion stages. On the one hand, it reduces the corrosive effect of high-concentration chlorine-containing compound flue gas on the superheater; on the other hand, it makes full use of the heat of low-concentration chlorine-containing compound flue gas, realizes the efficient utilization of flue gas waste heat, and effectively increases the power generation per ton of waste.

[0018] 3. The method of the garbage incineration system of the present invention introduces the flue gas generated by the garbage at different incineration stages into different flue gas channels for treatment according to the difference in the concentration of chlorine compounds. Among them, the flue gas with high concentration of chlorine compounds (referred to as high chlorine flue gas) is introduced into the first flue gas channel. In the first flue gas channel, the high chlorine flue gas flows through the evaporator and the first water-cooling pipe, and then enters the mixing channel. In this process, the saturated steam generated by the evaporator and the first water-cooling pipe enters the second flue gas channel. Since the working medium temperature of the evaporator's evaporation heating surface is at a low level, its tube wall temperature does not reach the temperature range where chlorine compounds cause high-speed corrosion, so the overall corrosion degree is relatively light. In the second flue gas channel, what flows through is high-temperature flue gas with a low concentration of chlorine compounds, so the corrosion rate of the high-temperature superheater can be significantly reduced. At the same time, the superheater can make full use of the waste heat generated by the high-temperature flue gas with a low concentration of chlorine compounds, heat the saturated steam from the evaporator and entering through the mixing channel, and convert it into high-temperature and high-pressure steam, which can then be used for power generation or other industrial application scenarios. In this way, the efficient utilization of flue gas waste heat is achieved, and the power generation per ton of garbage is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the waste incineration system of the present invention.

[0020] Figure 2 is a flow chart of the method of the present invention.

[0021] Legend: 1. First combustion chamber; 2. Second combustion chamber; 3. Combustion baffle; 4. Mixing channel; 5. Garbage hopper; 6. Grate; 101. First flue gas channel; 102. First water-cooling pipe; 103. Evaporator; 201. Second flue gas channel; 202. High-temperature superheater; 203. Medium-temperature superheater; 204. Low-temperature superheater; 301. Second water-cooling pipe; 401. Economizer; 402. Flue gas induced draft fan; 7. Slag discharge port. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0023] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Embodiment 1 like Figure 1 As shown, this embodiment provides a waste incineration system, including a waste hopper 5, a combustion chamber, and a slag discharge port 7. A grate 6 and a combustion baffle 3 are provided in the combustion chamber. The combustion baffle 3 divides the combustion chamber into a first combustion chamber 1 and a second combustion chamber 2. The first combustion chamber 1 is connected to a first flue gas channel 101, and the second combustion chamber 2 is connected to a second flue gas channel 201. The end of the first flue gas channel 101 is connected to the end of the second flue gas channel 201 through a mixing channel 4. At least one evaporator 103 and a first water-cooling pipe 102 are provided in the first flue gas channel 101. The evaporator 103 and the first water-cooling pipe 102 are used to generate saturated steam; at least one superheater is provided in the second flue gas channel 201. The superheater uses the waste heat of the low-chlorine flue gas generated by the combustion of waste in the second combustion chamber 2 to heat the saturated steam to form high-temperature and high-pressure steam for power generation or other uses.

[0027] The garbage incineration system in this embodiment is designed with a combustion baffle 3, which divides the traditional garbage incineration chamber into two incineration chambers: one is a first combustion chamber 1 that can produce flue gas containing chlorine compounds with a higher concentration, and the other is a second combustion chamber 2 that produces flue gas containing chlorine compounds with a lower concentration. The first combustion chamber 1 is connected to the first flue gas channel 101, and the second combustion chamber 2 is connected to the second flue gas channel 201. In the first flue gas channel 101, an evaporator 103 and a first water-cooling pipe 102 are arranged. The evaporator 103 and the first water-cooling pipe 102 can fully absorb the waste heat in the high-chlorine flue gas generated by the combustion of garbage in the first combustion chamber 1 to produce saturated steam. Since the working medium temperature of the evaporation heating surface of the evaporator 103 is relatively low, the temperature of its tube wall does not reach the temperature range where chlorine compounds cause high-speed corrosion, so the overall corrosion degree is relatively light. In the second flue gas channel 201, since the flue gas flowing through is high-temperature flue gas with a low concentration of chlorine compounds, the corrosion rate of the high-temperature superheater is greatly reduced. At the same time, the superheater can more effectively utilize the waste heat of the high-temperature flue gas with lower chlorine content, and produce high-temperature and high-pressure steam with higher parameters than traditional waste incineration superheaters, thereby realizing the efficient utilization of flue gas waste heat and effectively increasing the power generation per ton of waste.

[0028] In this embodiment, the superheater includes a high temperature superheater 202, a medium temperature superheater 203 and a low temperature superheater 204. By setting a three-stage superheater, the steam parameters can be gradually improved, and metal fatigue cracking caused by excessive temperature difference in a single-stage superheater can be avoided, which can greatly extend the service life of the equipment.

[0029] In this embodiment, the ends of the first flue gas channel 101 and the second flue gas channel 201 are connected by means of a mixing channel 4, and the flue gas treated by the first and second flue gas channels will be mixed again in the mixing channel 4. An economizer 401 and a flue gas induced draft fan 402 are provided in the mixing channel 4. The flue gas induced draft fan 402 is used to introduce the flue gas generated by the first combustion chamber 1 and the second combustion chamber 2 into the first flue gas channel 101 and the second flue gas channel 201 respectively. The economizer 401 absorbs the waste heat of the mixed flue gas and is used to preheat the boiler feed water before entering the evaporator 103, thereby realizing the secondary utilization of the waste heat of the mixed flue gas.

[0030] The saturated steam generated by the evaporator 103 is heated again by the heater in a low-chlorine flue gas environment and converted into high-temperature and high-pressure steam with higher parameters than traditional waste incineration, thereby improving the system's power generation rate per ton of waste. Compared with conventional waste incineration systems, the waste incineration system in this embodiment innovatively differentiates and utilizes the flue gas generated at different combustion stages. On the one hand, it reduces the corrosive effect of high-concentration chlorine-containing compound flue gas on the superheater; on the other hand, it makes full use of the heat of low-concentration chlorine-containing compound flue gas, realizes the efficient utilization of flue gas waste heat, and effectively increases the power generation per ton of waste.

[0031] In this embodiment, a second water-cooling pipe 301 is provided in the combustion baffle 3. Since the combustion baffle 3 is in the high temperature environment of the combustion chamber for a long time, the combustion baffle 3 can be actively cooled by designing the second water-cooling pipe 301, so as to avoid deformation of the combustion baffle 3 due to long-term high temperature, realize the function of protecting the combustion baffle 3, and extend the service life of the combustion baffle 3; at the same time, the cooling water can absorb the heat of the combustion baffle 3 when flowing through the second water-cooling pipe 301, and the heated cooling water can be directly used as boiler feed water preheating water, reducing the vaporization latent heat demand of the evaporator 103, effectively realizing heat recovery and utilization, and improving the overall thermal efficiency of the system.

[0032] In this embodiment, the grate 6 is arranged in a stepped manner. By arranging the stepped grate 6 in the combustion chamber, the garbage is naturally layered between the multiple steps. When the garbage falls layer by layer from top to bottom on the upper grate 6, the garbage is broken up and turned layer by layer, which is more conducive to uniform heating of the garbage.

[0033] Embodiment 2 like Figure 2 As shown, the present invention also discloses a method based on the waste incineration system described in embodiment 1, the steps comprising: Step S1: sending garbage into the combustion chamber; Step S2: Under the action of the grate 6, the garbage passes through the first combustion chamber 1 and the second combustion chamber 2 in sequence for combustion; Step S3: The high-chlorine flue gas generated by the combustion of garbage in the first combustion chamber 1 is introduced into the first flue gas channel 101, and enters the mixing channel 4 after passing through the evaporator 103. The saturated steam generated by the evaporator 103 and the first water-cooling pipe 102 is used for the superheater of the second flue gas channel 201 to generate high-temperature and high-pressure steam; Step S4: The low-chlorine flue gas generated by the combustion of garbage in the second combustion chamber 2 is introduced into the second flue gas channel 201. The superheater in the second flue gas channel 201 uses the waste heat of the low-chlorine flue gas to heat the saturated steam from the evaporator 103 and the first water-cooled pipe 102 to form high-temperature and high-pressure steam for power generation or other uses. The garbage incineration method in this embodiment introduces the flue gas generated at different incineration stages of the garbage into different flue gas channels for treatment according to the difference in the concentration of chlorine compounds. Among them, the flue gas with high concentration of chlorine compounds (referred to as high-chlorine flue gas) is introduced into the first flue gas channel 101. In the first flue gas channel 101, the high-chlorine flue gas flows through the evaporator 103 and the first water-cooling channel 102, and then enters the mixing channel 4. In this process, the saturated steam generated by the evaporator 103 and the first water-cooling pipe 102 enters the second flue gas channel 201. Since the working medium temperature of the evaporating heating surface of the evaporator 103 is at a relatively low level, the temperature of its tube wall has not reached the temperature range where chlorine compounds cause high-speed corrosion, so the overall degree of corrosion is relatively light. In the second flue gas channel 201, what flows through is high-temperature flue gas with a low concentration of chlorine compounds, so the corrosion rate of the superheater can be significantly reduced. At the same time, the superheater can make full use of the waste heat of the high-temperature flue gas with a low concentration of chlorine compounds to heat the saturated steam from the evaporator 103, thereby generating high-temperature and high-pressure steam with higher parameters than that of traditional waste incineration superheaters. In this way, efficient utilization of the waste heat of the flue gas is achieved, and the power generation per ton of waste is effectively increased.

[0034] In this embodiment, step S5 is also included: mixing the flue gas after the operation through the first flue gas channel 101 and the second flue gas channel 201, and then sending the mixed flue gas to the economizer 401. The flue gas processed by the first and second flue gas channels will be mixed again in the mixing channel 4. The economizer 401 can absorb the waste heat of the mixed flue gas and preheat the boiler feed water before entering the evaporator 103. The saturated steam generated by the evaporator 103 is converted into high-temperature and high-pressure steam after being heated again by the superheater, thereby realizing the secondary utilization of the waste heat of the mixed flue gas, greatly improving the thermal efficiency of the system.

[0035] In this embodiment, the superheater in step S4 includes a high-temperature superheater 202, a medium-temperature superheater 203 and a low-temperature superheater 204, and the saturated steam passes through the low-temperature superheater 204, the medium-temperature superheater 203 and the high-temperature superheater 202 in sequence to be heated step by step.

[0036] Working principle: When garbage enters the combustion chamber from the garbage hopper 5, under the action of the grate 6, the garbage is dried, burned, and burned out to produce flue gas, which is finally discharged from the slag discharge port 7. Under the action of the combustion baffle 3, the garbage is dried and primarily burned in the first combustion chamber 1, generating flue gas at 200-500°C. The flue gas contains a relatively high concentration of chlorine-containing compounds, which will enter the first flue gas channel 101 under the action of the flue gas induced draft fan 402. In the first flue gas channel 101, the evaporator 103 and the first water-cooling channel 104 fully absorb the waste heat in the high-chlorine flue gas generated by the combustion of garbage in the first combustion chamber 1 to generate saturated steam; in the second combustion chamber 2, the garbage continues to burn until it is completely burned, generating a relatively low concentration of chlorine-containing flue gas, which enters the second flue gas channel 201 under the action of the flue gas induced draft fan 402. The saturated steam from the evaporator 103 is gradually heated by the low-temperature superheater 204, the medium-temperature superheater 203, and the high-temperature superheater 202. After being heated in the high-temperature superheater 202, high-pressure and high-temperature steam of about 450-500°C is formed, which is passed into the generator set for power generation and other uses. The flue gas treated by the first and second flue gas channels will be mixed again in the mixing channel 4, and the economizer 401 can absorb the waste heat of the mixed flue gas to preheat the boiler feed water before entering the evaporator 103. The saturated steam generated by the evaporator 103 is heated again by the superheater and converted into high-temperature and high-pressure steam, thereby realizing the secondary utilization of the waste heat of the mixed flue gas, and the heat of all the flue gases is fully utilized. Compared with the traditional incinerator, the garbage incineration system and method of the present invention divides the combustion chamber through the combustion partition 3 according to the different chlorine concentrations of the flue gas generated by the garbage at different combustion stages, and the generated flue gas is used for heat by the corresponding flue gas channel. The low-chlorine flue gas in the superheater operation can increase the steam passing through the superheater from 400°C to 450-500°C, and the garbage ton power generation rate is improved compared with the traditional garbage power generation technology. The present invention not only solves the problem of rapid corrosion of the superheater due to high chlorine content caused by a flue gas channel and the inability to increase the temperature of the power generation steam, but also realizes the full utilization of the flue gas heat, greatly improving the thermal efficiency of the system.

[0037] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A waste incineration system, characterized in that: The invention comprises a garbage inlet hopper (5), a combustion chamber, and a slag discharge port (7). A grate (6) and a combustion baffle (3) are provided in the combustion chamber. The combustion baffle (3) divides the combustion chamber into a first combustion chamber (1) and a second combustion chamber (2). The first combustion chamber (1) is connected to a first smoke channel (101), and the second combustion chamber (2) is connected to a second smoke channel (201). The end of the first smoke channel (101) is connected to the end of the second smoke channel (201) via a mixing channel (4). At least one evaporator (103) and a first water-cooling pipe (102) are provided in the first smoke channel (101). The evaporator (103) and the first water-cooling pipe (102) are used to generate saturated steam. At least one superheater is provided in the second smoke channel (201). The superheater utilizes the waste heat of low-chlorine smoke generated by the combustion of garbage in the second combustion chamber (2) to heat the saturated steam to form high-temperature and high-pressure steam for power generation or other utilization.

2. The waste incineration system according to claim 1, characterized in that: The superheater comprises a high-temperature superheater (202), a medium-temperature superheater (203) and a low-temperature superheater (204).

3. The waste incineration system according to claim 1, characterized in that: An economizer (401) and a flue gas induced draft fan (402) are provided in the mixing channel (4); the flue gas induced draft fan (402) is used to introduce flue gas generated by the first combustion chamber (1) and the second combustion chamber (2) into the first flue gas channel (101) and the second flue gas channel (201), respectively; the economizer (401) absorbs waste heat of the mixed flue gas and is used to preheat boiler feed water before entering the evaporator (103).

4. The waste incineration system according to any one of claims 1 to 3, characterized in that: A second water cooling pipe (301) is provided in the combustion baffle (3).

5. The waste incineration system according to any one of claims 1 to 3, characterized in that: The grate (6) is arranged in a stepped manner.

6. A method for incinerating waste based on the waste incineration system according to any one of claims 1 to 5, characterized in that the steps include: Step S1: sending garbage into the combustion chamber; Step S2: Under the action of the grate (6), the garbage passes through the first combustion chamber (1) and the second combustion chamber (2) in sequence for combustion; Step S3: high-chlorine flue gas generated by burning garbage in the first combustion chamber (1) is introduced into the first flue gas channel (101), passes through the evaporator (103) and enters the mixing channel (4), and the saturated steam generated by the evaporator (103) and the first water-cooling pipe (102) is used for the superheater of the second flue gas channel (201) to generate high-temperature and high-pressure steam; Step S4: low-chlorine flue gas generated by the combustion of garbage in the second combustion chamber (2) is introduced into the second flue gas channel (201); the superheater in the second flue gas channel (201) uses the waste heat of the low-chlorine flue gas to heat the saturated steam to form high-temperature and high-pressure steam for power generation or other uses.

7. The waste incineration method according to claim 6, characterized in that: The method further comprises step S5: mixing the flue gas after passing through the first flue gas channel (101) and the second flue gas channel (201), and then sending the mixed flue gas into the economizer (401), wherein the economizer (401) is used to preheat the boiler feed water before entering the evaporator (103).

8. The waste incineration method according to claim 6, characterized in that: The superheater in step S4 comprises a high-temperature superheater (202), a medium-temperature superheater (203) and a low-temperature superheater (204), and the saturated steam is sequentially heated by passing through the low-temperature superheater (204), the medium-temperature superheater (203) and the high-temperature superheater (202).

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