Comprehensive utilization system and treatment process for oxygen in household garbage incineration power plant

Abstract

The invention belongs to the field of waste incineration treatment, and particularly relates to a household waste incineration power plant oxygen comprehensive utilization system and a treatment process. The oxygen station is used for providing an oxygen source for the leachate treatment station, the household garbage incinerator, the ozone generator and the oxygen-enriched side-blown converter; the ozone generator is used for preparing ozone by taking oxygen provided by the oxygen station as a raw material and providing ozone for the leachate treatment station and the ozone denitration reactor; and the oxygen-enriched side-blown furnace is used for performing oxygen-enriched combustion and high-temperature melting on slag and fly ash generated by the household garbage incineration power generation treatment system to prepare rock wool. By means of the one-source multi-effect comprehensive utilization mode of oxygen in a traditional waste incineration power plant, all systems in a traditional household waste incineration power generation treatment system are organically coupled, the energy efficiency is improved, pollutant control and resource recovery are organically combined, and the problems faced by current household waste incineration power generation enterprises can be effectively solved.

Description

Technical Field

[0001] This invention belongs to the field of waste incineration treatment, and in particular to a comprehensive oxygen utilization system and treatment process for municipal solid waste incineration power plants. Background Technology

[0002] With the gradual implementation of waste sorting, increasingly stringent environmental protection requirements, and the influence of multiple factors such as carbon emission reduction, the municipal solid waste incineration power generation industry is abandoning its previous high-speed, extensive development model and gradually shifting towards green, low-carbon, and high-quality development. Currently, municipal solid waste incineration power generation companies face multiple challenges, including insufficient waste volume, stricter environmental standards, energy efficiency bottlenecks, pollutant emission restrictions, and high operating costs. The operation of these companies will gradually enter a period of cost reduction, efficiency improvement, pollution reduction, and carbon reduction.

[0003] Patent CN222718203U discloses an oxygen-enriched combustion and fly ash melting system for aged waste, including a liquid oxygenation system, a waste incineration system and a fly ash melting system. Liquid oxygen is gasified and then fed into the waste incineration system and the fly ash melting system for oxygen-enriched combustion, thereby achieving high-temperature melting treatment of aged waste and incineration fly ash. Patent CN115200024A discloses a low-nitrogen, oxygen-enriched, high-efficiency, and clean waste incineration system and method, including a pressure swing adsorption (PSA) O2 separator, a flue gas steam heat exchanger, an incinerator, a preheater, a semi-dry reaction tower, and a bag filter. Its core consists of three stages: "anaerobic drying / pyrolysis," "solid-phase air combustion," and "gas-phase oxygen-enriched combustion." A certain amount of flue gas is drawn from the induced draft fan and enters the PSA oxygen separator. The anaerobic flue gas enters the "anaerobic drying / heating stage," and the oxygen enters the "gas-phase oxygen-enriched combustion" stage for oxygen-enriched combustion. Patent CN113701162A discloses an oxygen-enriched waste incineration power generation system. The system uses the low-cost green electricity generated by waste incineration to produce hydrogen through electrolysis of waste leachate. The byproduct oxygen enters the incineration system from the secondary air system for oxygen-enriched combustion.

[0004] The aforementioned patents all obtain oxygen through different methods for oxygen-enriched combustion, which belongs to the application of oxygen in the field of oxygen-enriched combustion, and the utilization of oxygen is relatively simple. Summary of the Invention

[0005] The purpose of this invention is to address the problems faced by existing municipal solid waste incineration power plants, such as insufficient waste volume, stricter environmental standards, energy efficiency bottlenecks, restrictions on pollutant emissions, and high operating costs. This invention proposes an oxygen comprehensive utilization system and treatment process for municipal solid waste incineration power plants to achieve cost reduction, efficiency improvement, pollution reduction, and carbon reduction for these enterprises.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides an oxygen comprehensive utilization system for a municipal solid waste incineration power plant, comprising: The waste bin is used to ferment waste to reduce moisture and increase calorific value, and to drain leachate. The leachate treatment plant treats the landfill leachate. The incinerator is used to incinerate fermented waste, as well as sludge and concentrate after leachate treatment. The incinerator is supplied with primary and secondary air for complete combustion. The oxygen-enriched side-blown furnace is supplied with oxygen by an oxygen station and is used to perform oxygen-enriched combustion treatment on the slag produced by the incinerator and the fly ash produced by the flue gas purification system, and then melted at high temperature to make rock wool. The waste heat boiler is divided into a first boiler and a second boiler. The first boiler is connected to the incinerator and uses the high-temperature flue gas generated by the incinerator to exchange heat and generate steam for power generation. The second boiler is connected to the oxygen-enriched side-blown furnace and uses the high-temperature flue gas generated by the oxygen-enriched side-blown furnace to exchange heat and generate steam to heat the primary air entering the incinerator. Ozone denitrification reactor is used to oxidize low-temperature flue gas from waste heat boilers. The flue gas purification system purifies the low-temperature flue gas after oxidation treatment; The ozone generator connects the leachate treatment station and the ozone denitrification reactor, and uses the oxygen supply from the oxygen station to provide ozone for the leachate treatment station and the ozone denitrification reactor. The oxygen station provides oxygen for the primary and secondary air of the incinerator, the ozone generator, the leachate treatment station, and the oxygen-enriched side-blown furnace.

[0007] The present invention discloses a treatment process for an oxygen comprehensive utilization system in a municipal solid waste incineration power plant, comprising the following steps: Step 1: The raw waste is transported to the waste storage area and stored for several days to ferment in order to reduce moisture and increase calorific value. The leachate is then transported to the leachate treatment plant. Step 2: The leachate first enters the pretreatment stage to remove suspended solids and homogenize, and then enters the biological treatment stage, undergoing anaerobic treatment and aerobic treatment. The oxygen for the aerobic treatment comes from the oxygen station. Step 3: The leachate is then subjected to membrane separation treatment, which includes ultrafiltration (MBR), nanofiltration (NF), and reverse osmosis (RO). The leachate after ultrafiltration and before nanofiltration undergoes ozone treatment to oxidize residual COD, color, and trace toxic substances. The treated leachate is then subjected to nanofiltration and reverse osmosis again, and the final product is qualified water that is reused. The concentrate undergoes a second ozone treatment, with the ozone coming from an ozone generator. Step 4: The fermented waste in the waste storage area and the sludge generated during the leachate treatment process are burned in the incinerator, and the concentrated liquid generated during the leachate treatment process is sprayed back into the incinerator. Step 5: The high-temperature flue gas generated by the incinerator enters the first waste heat boiler for heat exchange and generates steam to power the steam turbine generator set. The low-temperature flue gas after heat exchange enters the ozone denitrification reactor to oxidize the low-valence nitrogen oxides into high-valence nitrogen oxides. Finally, it is treated by the flue gas purification system and discharged in compliance with standards.

[0008] As a further preferred option, the fly ash generated by the flue gas purification system is washed with water, and the slag generated by the incinerator is crushed and fed together into the oxygen-enriched side-blown furnace. The oxygen-enriched side-blown furnace melts the mixed slag and fly ash into rock wool at high temperature through oxygen-enriched combustion.

[0009] As a further preferred option, the high-temperature flue gas from the oxygen-enriched side-blown furnace enters the second waste heat boiler for heat exchange to generate steam. The low-temperature flue gas after heat exchange also enters the ozone denitrification reactor. The steam generated by the waste heat boiler enters the primary air preheater to heat the primary air entering the incinerator.

[0010] As a further preferred option, the ratio of primary air to secondary air entering the incinerator is 7:3. The oxygen content of the primary air in the combustion section of the incinerator is adjusted between 21% and 30% according to the combustion status of the bed. The oxygen content of the primary air in the burnout section is adjusted between 21% and 25%. The secondary air is injected into the throat of the incinerator and has an oxygen content of 21% to 23%.

[0011] As a further preferred option, the combustion oxygen content in the oxygen-enriched side-blown furnace is 50-80%.

[0012] As a further preferred option, the primary air temperature entering the incinerator is 220°C.

[0013] Compared with the prior art, the present invention has the following advantages: 1. By using oxygen in the incineration system, oxygen-enriched combustion is achieved in the municipal solid waste incineration system, effectively addressing issues such as poor waste quality, insufficient waste volume, complex co-combustion components, and high combustion costs. This effectively improves the combustion conditions of waste on the bed, increases furnace temperature, reduces the use of auxiliary fossil fuels, and makes waste incineration more thorough. Due to the reduction in the amount of air required for combustion and the amount of flue gas generated, the power consumption of primary and secondary fans and induced draft fans can be reduced. The reduction in flue gas volume reduces exhaust losses, improves boiler efficiency, significantly enhances energy utilization efficiency, and reduces carbon emissions.

[0014] 2. By using oxygen and ozone in the leachate treatment system, pure oxygen aeration and deep degradation of recalcitrant organic matter are achieved, reducing aeration energy consumption and improving pollutant treatment efficiency. Simultaneously, the ozone-treated concentrate is injected back into the incinerator, where the NH4 in the concentrate... +H2O2 and ·OH undergo selective non-catalytic reduction reactions with flue gas to achieve denitrification, which can replace or reduce the amount of SNCR / SCR reagents used, thus achieving "waste treatment with waste".

[0015] 3. By using ozone in the flue gas purification system, efficient denitrification and synergistic treatment of dioxins, heavy metals and chlorinated organic compounds can be achieved, realizing the synergistic control of multiple pollutants, reducing the amount of environmental protection consumables such as lime and activated carbon, and lowering the operating cost of flue gas purification.

[0016] 4. By using oxygen in the ash and slag treatment system, and employing oxygen-enriched combustion to melt ash and slag at high temperatures to produce rock wool, high-value utilization of slag and fly ash is achieved, completely solving the problem of difficult fly ash disposal and truly turning ash and slag "from waste to treasure".

[0017] 5. This system organically integrates leachate treatment, waste incineration, flue gas purification, and ash treatment systems to construct a closed-loop system for multi-efficiency utilization of oxygen. This makes oxygen a "green link" throughout the entire waste incineration process. The subsystems are closely interconnected and scientifically coupled to form a closed-loop system of "high-efficiency utilization, waste treatment, and turning waste into treasure," effectively addressing the current challenges faced by waste-to-energy incineration companies. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the system structure of the present invention. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] The traditional process flow of current municipal solid waste incineration power generation enterprises is as follows: garbage trucks collect raw waste, weigh it on a weighbridge, and then send it into the waste storage area. The raw waste is stored in the waste storage area for several days to ferment. During this period, the leachate generated is sent to the leachate treatment station for treatment. After fermentation, the moisture content of the waste decreases and the calorific value increases. It is then sent to the incinerator grate for combustion by a garbage crane. The air required for combustion is provided by primary and secondary fans. The high-temperature flue gas generated by combustion enters the waste heat boiler to use the heat energy of the flue gas to produce steam for the steam turbine generator set to generate electricity. The low-temperature flue gas after heat exchange in the waste heat boiler enters the flue gas purification device. After purification treatment to meet the standards, it is sent to the chimney by the induced draft fan and finally discharged into the atmosphere.

[0021] This invention proposes a comprehensive oxygen utilization system and process for waste incineration power plants. Through a comprehensive utilization model of "one source, multiple effects", it organically couples a leachate treatment system, an incineration system, a flue gas purification system, and an ash treatment system, as detailed below.

[0022] Garbage trucks transport the collected raw waste to a waste storage facility, where it is stored for several days to ferment, reducing moisture content and increasing calorific value. The leachate drained from the waste storage facility is then transported to a leachate treatment plant for processing.

[0023] The leachate first enters the pretreatment stage to remove suspended solids and homogenize, and then enters the biological treatment stage, in which the leachate needs to undergo anaerobic and aerobic treatment.

[0024] A portion of the oxygen (pure oxygen) from the oxygen station is introduced into the aerobic tank (O tank) of the leachate treatment station to replace traditional air aeration, thereby increasing the dissolved oxygen concentration (>4mg / L), accelerating the degradation of ammonia nitrogen by nitrifying bacteria, strengthening aerobic degradation and denitrification, achieving an oxygen utilization rate of over 90%, reducing energy consumption by 30% compared to air aeration, and correspondingly reducing sludge production.

[0025] The leachate then enters the membrane separation stage for deep purification. An ozone generator is installed in the leachate treatment station, and pure oxygen from the oxygen station is used to generate ozone. Specifically, the membrane separation stage refers to the ozone oxidation treatment of the leachate between the ultrafiltration (MBR) and nanofiltration (NF) processes, which involve ultrafiltration (MBR) and reverse osmosis (RO). This ozone oxidation further oxidizes the residual recalcitrant COD, color, and trace toxic substances, breaking down recalcitrant organic matter and decolorizing and detoxifying it. The leachate after the first ozone oxidation treatment continues to be filtered by reverse osmosis (RO). The filtered water is qualified water, and the separated leachate is a concentrate. Ozone is then added to the concentrate to further degrade high concentrations of organic nitrogen and complexed heavy metals, avoiding the risk of dioxin formation when it is injected back into the incinerator.

[0026] The sludge produced by the leachate treatment plant is incinerated together with the fermented waste in the landfill. The concentrated leachate from the treatment plant is injected back into the incinerator for further high-temperature incineration to decompose the organic matter and reduce pollutant emissions. The concentrated leachate is then oxidized by ozone, reducing the NH4 content... + H2O2 and ·OH undergo selective non-catalytic reduction reactions with flue gas to achieve denitrification, which can replace or reduce the amount of SNCR / SCR reagents used, thus achieving "waste treatment with waste".

[0027] The fermented waste enters the incinerator for incineration. The incinerator is divided into a drying section, a combustion section, and a burnout section according to the characteristics of the waste. Each section is equipped with an independent variable frequency primary air fan to provide the primary air required for solid-phase combustion of the waste on the bed. A primary air preheater is installed on the primary air duct. Steam generated by the oxygen-enriched side-blown waste heat boiler of the ash treatment system is used to exchange heat with the primary air, so that the primary air temperature reaches 220°C. At the throat of the incinerator bed, a variable frequency secondary air fan provides the secondary air required for gas-phase combustion. The ratio of primary air to secondary air is 7:3. Oxygen (pure oxygen) from the oxygen station is divided into two streams, one entering the hot primary air duct and the other the secondary air duct. In the hot primary air duct, only the primary air ducts of the combustion and burnout sections are mixed with oxygen. The oxygen content in the primary air of the combustion section is adjusted between 21% and 30% according to the combustion conditions of the bed, ensuring stable ignition and complete combustion of the waste. In the burnout section, the oxygen content is adjusted between 21% and 25%, ensuring complete combustion of the waste while preventing excessive oxygen from entering the furnace. The other stream of oxygen, after being mixed with secondary air, is injected into the furnace throat through secondary air nozzles. The secondary air oxygen content is between 21% and 23%, ensuring complete combustion of gaseous combustibles while preventing excessive oxygen concentration from increasing the oxygen content in the flue gas. It also avoids excessive reduction in secondary air volume, which could lead to reduced turbulence at the furnace throat. By introducing oxygen-enriched air into the incinerator in a zoned and staged manner, the combustion of solid and gaseous combustibles is more complete, and the decomposition of harmful substances is more thorough. This avoids the use of fossil auxiliary fuels, reduces carbon emissions, and reduces the amount of air required for combustion and the amount of flue gas generated due to the use of oxygen-enriched combustion. This also reduces the power consumption of the blower, reduces boiler exhaust losses, and improves boiler efficiency, thus achieving efficient and clean incineration of waste in the incinerator.

[0028] The high-temperature flue gas from the incinerator enters the waste heat boiler for heat exchange, generating steam to power a steam turbine generator set. The low-temperature flue gas from the waste heat boiler outlet mixes with the low-temperature flue gas from the oxygen-enriched side-blown waste heat boiler outlet (190–220°C) and is then sent to the flue gas purification system. An ozone generator is installed at the flue gas purification system to produce ozone using pure oxygen from an oxygen station. An ozone denitrification reactor is installed on the main flue gas pipeline after mixing with the low-temperature flue gas, before the semi-dry reaction tower of the flue gas purification device. Ozone is then transported to the ozone denitrification reactor. More than 90% of the nitrogen oxides (NOx) in the flue gas exist in the form of NO, which is sparingly soluble in water. Through the strong oxidizing effect of ozone, these are converted into higher valence nitrogen oxides (NO2, N2O5), which are readily soluble in water. Simultaneously, ozone can also synergistically oxidize dioxin precursors and heavy metals (such as Hg). 0 →Hg 2+The ozone in the flue gas purification system can efficiently remove nitrification, synergistically remove multiple pollutants, and enhance the degradation of organic pollutants, thereby reducing the load on subsequent treatment processes, reducing the consumption of environmental protection consumables, and lowering the cost of flue gas purification.

[0029] The fly ash (after washing) produced from the crushed slag and flue gas purified by waste incineration is thoroughly mixed and used as raw material for rock wool production. A portion of the oxygen from the oxygen station is fed into an oxygen-enriched side-blown furnace, where the treated and mixed slag and fly ash are melted at high temperatures through oxygen-enriched combustion (50-80% oxygen content) to produce rock wool. The flue gas is then treated in a waste heat boiler and then enters a flue gas purification system before being discharged in compliance with standards. The steam generated by the waste heat boiler is used to heat the primary air of the waste incineration unit, saving on steam extraction from the boiler drum and turbine, and allowing more high-quality steam to be used for power generation. By producing rock wool from the ash produced by incineration, not only is the harmless disposal of ash achieved, solving the fly ash disposal problem that has plagued enterprises, but the high-value utilization of slag and fly ash is also realized, truly achieving "turning waste into treasure."

[0030] For landfill leachate treatment plant systems, after the leachate is treated by membrane technology, the permeate water quality meets the standards and is reused as qualified water. The water that does not permeate through the membrane is concentrated and is called concentrate, which contains high concentrations of pollutants. This concentrate is then treated with ozone before being injected back into the furnace.

[0031] Oxygen plays a three-pronged role in the leachate treatment process. First, a portion of the oxygen enters the aerobic tank for pure oxygen aeration, replacing traditional air aeration. This increases dissolved oxygen concentration and accelerates the degradation of ammonia nitrogen by nitrifying bacteria, making it particularly suitable for leachates with high ammonia nitrogen content. Energy consumption is reduced by 30% compared to traditional air aeration, resulting in a corresponding decrease in sludge production. Ozone from the ozone generator then enters the advanced oxidation stage and the membrane concentrate treatment stage. In the advanced oxidation stage, ozone catalytic oxidation is used as a deep treatment unit after biological treatment to oxidize and break down residual, recalcitrant COD, color, and trace toxic substances in the water. In the membrane concentrate treatment stage, ozone oxidation is used to degrade high concentrations of organic nitrogen and complexed heavy metals in the concentrate, avoiding the risk of dioxin formation when the concentrate is injected back into the incinerator. The final sludge produced by the leachate treatment system is sent to the incinerator for incineration. The leachate concentrate is injected back into the incinerator, where it undergoes ozone oxidation, reducing NH4+. + H2O2 and ·OH undergo selective non-catalytic reduction reactions with flue gas to achieve denitrification, which can replace or reduce the amount of SNCR reagents used, thus achieving "waste treatment with waste".

[0032] For the incinerator system, a portion of the oxygen is mixed with primary air in the combustion and burnout sections of the incinerator grate to form oxygen-enriched air, which then enters the grate from the bottom in separate zones. The oxygen content of the primary air in the combustion section is adjusted between 21% and 30%, while in the burnout section it is adjusted between 21% and 25%. Because the oxygen-enriched air penetrates the waste layer and directly contacts the waste to participate in the combustion reaction, it effectively improves the combustion intensity of the waste, improves the combustion condition of the bed, and reduces the slag's loss on ignition, resulting in more complete combustion and more thorough decomposition of harmful substances. Simultaneously, the oxygen-enriched flame is brighter and more golden, significantly increasing the heat radiation to the waste in the drying section, leading to better drying and facilitating stable ignition and combustion of subsequent waste. The remaining oxygen is injected from the furnace throat through secondary air mixing. The secondary air oxygen content is between 21% and 23%, ensuring complete combustion of gaseous combustibles while preventing excessive oxygen concentration from increasing the oxygen content in the flue gas. It also avoids excessive reduction in secondary air volume, which could reduce the turbulence at the furnace throat. Because of the use of oxygen-enriched combustion in the incineration system, the waste is burned more cleanly, harmful substances are decomposed more completely, the amount of combustion air and generated flue gas is reduced, boiler exhaust losses are reduced, boiler efficiency is improved, and the power consumption of the blower is reduced. At the same time, the use of auxiliary fuel can be reduced, which can improve the overall energy utilization efficiency of the incineration system.

[0033] For flue gas purification systems, ozone generated by an ozone generator is introduced into an ozone denitrification reactor located in the flue gas duct after the waste heat boiler outlet and before the semi-dry reaction tower. Leveraging the strong oxidizing properties of ozone, the poorly water-soluble NO in the flue gas is oxidized into easily water-soluble, higher-valence nitrogen oxides (NO2, N2O5). In subsequent flue gas purification processes, these oxides react with, are absorbed by, and solidified by the semi-dry lime slurry, calcium hydroxide in the dry spraying process, and activated carbon, thus achieving highly efficient denitrification of the flue gas. Simultaneously, it can synergistically oxidize dioxin precursors and heavy metals (such as Hg). 0 →Hg 2+ It can effectively control multiple pollutants, including chlorinated organic compounds. By using ozone denitrification, it can replace the traditional SNCR / SCR process, reducing the consumption of corresponding environmental protection consumables and lowering the cost of flue gas purification.

[0034] For the ash and slag treatment system, a portion of the oxygen from the oxygen station is fed into an oxygen-enriched side-blown furnace. Through oxygen-enriched combustion (oxygen content 50-80%), the treated and mixed slag and fly ash are melted at high temperatures to produce rock wool. The flue gas, after heat exchange in a waste heat boiler, enters a flue gas purification system for treatment before being discharged in compliance with standards. The steam generated by the waste heat boiler is used to heat the primary air for waste incineration, saving on steam extraction from the boiler drum and turbine, and allowing more high-quality steam to be used for power generation. By producing rock wool from the ash and slag produced by incineration, not only is the harmless disposal of ash and slag achieved, solving the fly ash disposal problem that has plagued enterprises, but the slag and fly ash are also utilized at high value, truly realizing "turning waste into treasure."

[0035] In addition, the oxygen integrated utilization system provided by this invention consists of an oxygen station, an ozone generator, related connecting pipelines, and a waste incineration power generation system. The oxygen station can be one or more combinations of cryogenic air separation units, pressure swing adsorption units, and liquid oxygen storage tanks. Its function is to provide an oxygen source for the entire plant's oxygen system. The oxygen is sent to the leachate treatment system, the primary and secondary air systems of the incineration system, the oxygen-enriched side-blown furnace of the ash treatment system, and the ozone generator through different pipelines. The ozone generator uses the pure oxygen provided by the oxygen station to generate ozone for subsequent treatment processes. The ozone is sent to the leachate treatment system and the flue gas purification system through pipelines.

[0036] In summary, this invention proposes an oxygen comprehensive utilization system and treatment process for waste-to-energy incineration plants. Through a comprehensive utilization model of "one source, multiple effects," it organically couples leachate treatment systems, incineration systems, flue gas purification systems, and ash treatment systems, making oxygen a "green link" throughout the entire waste incineration process. This not only significantly improves energy efficiency but also organically combines pollutant control with resource recovery, providing waste-to-energy incineration plants with a sustainable and circular solution that is "efficiently utilized, waste-to-waste, and turns waste into treasure." This addresses the multiple challenges currently faced by municipal solid waste incineration power plants, such as insufficient waste volume, stricter environmental standards, energy efficiency bottlenecks, pollutant emission restrictions, and high operating costs, thereby achieving cost reduction, efficiency improvement, pollution reduction, and carbon reduction for enterprises.

[0037] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A comprehensive oxygen utilization system for a municipal solid waste incineration power plant, characterized in that, include: The waste bin is used to ferment waste to reduce moisture and increase calorific value, and to drain leachate. The leachate treatment plant treats the landfill leachate. The incinerator is used to incinerate fermented waste, as well as sludge and concentrate after leachate treatment. The incinerator is supplied with primary and secondary air for complete combustion. The oxygen-enriched side-blown furnace is supplied with oxygen by an oxygen station and is used to burn the slag produced by the incinerator and the fly ash produced by the flue gas purification system in an oxygen-enriched manner, and melt them at high temperature to make rock wool. The waste heat boiler is divided into a first boiler and a second boiler. The first boiler is connected to the incinerator and uses the high-temperature flue gas generated by the incinerator to exchange heat and generate steam for power generation. The second boiler is connected to the oxygen-enriched side-blown furnace and uses the high-temperature flue gas generated by the oxygen-enriched side-blown furnace to exchange heat and generate steam to heat the primary air entering the incinerator. The ozone denitrification reactor is used to oxidize the low-temperature flue gas from the waste heat boiler. The flue gas purification system purifies the low-temperature flue gas after oxidation treatment; The ozone generator connects the leachate treatment station and the ozone denitrification reactor, and uses the oxygen supply from the oxygen station to provide ozone for the leachate treatment station and the ozone denitrification reactor. The oxygen station provides oxygen for the primary and secondary air of the incinerator, the ozone generator, the leachate treatment station, and the oxygen-enriched side-blown furnace.

2. The treatment process of an oxygen comprehensive utilization system for a municipal solid waste incineration power plant according to claim 1, characterized in that, Includes the following steps: Step 1: The raw waste is transported to the waste storage area and stored for several days to ferment in order to reduce moisture and increase calorific value. The leachate is then transported to the leachate treatment plant. Step 2: The leachate first enters the pretreatment stage to remove suspended solids and homogenize, and then enters the biological treatment stage, undergoing anaerobic treatment and aerobic treatment. The oxygen for the aerobic treatment comes from the oxygen station. Step 3: The leachate is then subjected to membrane separation treatment, which includes ultrafiltration (MBR), nanofiltration (NF), and reverse osmosis (RO). The leachate after ultrafiltration and before nanofiltration undergoes ozone treatment to oxidize residual COD, color, and trace toxic substances. The treated leachate is then subjected to nanofiltration and reverse osmosis again, and the final product is qualified water that is reused. The concentrate undergoes a second ozone treatment, with the ozone coming from an ozone generator. Step 4: The fermented waste in the waste storage area and the sludge generated during the leachate treatment process are burned in the incinerator, and the concentrated liquid generated during the leachate treatment process is sprayed back into the incinerator. Step 5: The high-temperature flue gas generated by the incinerator enters the first waste heat boiler for heat exchange and generates steam to power the steam turbine generator set. The low-temperature flue gas after heat exchange enters the ozone denitrification reactor to oxidize the low-valence nitrogen oxides into high-valence nitrogen oxides. Finally, it is treated by the flue gas purification system and discharged in compliance with standards.

3. The treatment process of an oxygen comprehensive utilization system for a municipal solid waste incineration power plant according to claim 2, characterized in that: The fly ash produced by the flue gas purification system is washed with water, and the slag produced by the incinerator is crushed and fed together into the oxygen-enriched side-blown furnace. The oxygen-enriched side-blown furnace melts the mixed slag and fly ash into rock wool through oxygen-enriched combustion.

4. The treatment process of an oxygen comprehensive utilization system for a municipal solid waste incineration power plant according to claim 3, characterized in that: The high-temperature flue gas from the oxygen-enriched side-blown furnace enters the second waste heat boiler to generate steam. The low-temperature flue gas after heat exchange also enters the ozone denitrification reactor. The hot steam generated by the waste heat boiler heats the primary air preheater, which is used to heat the primary air entering the incinerator.

5. The treatment process of an oxygen comprehensive utilization system for a municipal solid waste incineration power plant according to claim 2, characterized in that: The ratio of primary air to secondary air entering the incinerator is 7:3, and the temperature of the primary air entering the incinerator is 220℃.

6. The treatment process of an oxygen comprehensive utilization system for a municipal solid waste incineration power plant according to claim 2, characterized in that: The oxygen content of the primary air in the combustion section of the incinerator is adjusted between 21% and 30% according to the combustion conditions of the bed, and the oxygen content of the primary air in the burnout section is adjusted between 21% and 25%.

7. The treatment process of an oxygen comprehensive utilization system for a municipal solid waste incineration power plant according to claim 2, characterized in that: Secondary air is injected into the throat of the incinerator furnace, and the oxygen content of the secondary air is adjusted between 21% and 23%.

8. The treatment process of an oxygen comprehensive utilization system for a municipal solid waste incineration power plant according to claim 2, characterized in that: The oxygen content in the oxygen-enriched side-blown furnace is adjusted between 50% and 80%.

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