A hazardous waste incineration system and method based on overburning coupling and in-situ dioxin suppression

Abstract

This invention discloses a hazardous waste incineration system and method based on supercombustion coupling and in-situ dioxin inhibition, specifically relating to the field of hazardous waste incineration technology. The system includes a multi-stage zoned oxygen-controlled incinerator, a dynamic composite inhibitor in-situ generation and multi-stage injection system, and a full-process multi-parameter feedback control system. The incinerator is sequentially divided into a volatilization zone, a main combustion zone, and a burnout zone along the material propulsion direction, with each zone independently controlled for oxygen and temperature. A chloride recovery unit recovers chloride from the flue gas, reacts with inhibitor precursors in the in-situ reactor to generate composite inhibitors, and injects them into each zone. The control system monitors and automatically adjusts the oxygen supply and inhibitor injection parameters in real time. This invention achieves efficient dioxin inhibition through the synergistic effect of multi-stage zoned oxygen control and in-situ inhibitor generation, reducing inhibitor usage costs. The system operates stably and with a high degree of automation.

Description

Technical Field

[0001] This invention relates to the field of hazardous waste incineration technology, and more specifically, to a hazardous waste incineration system and method based on supercombustion coupling and in-situ dioxin suppression. Background Technology

[0002] Hazardous waste incineration is currently the main technical means to achieve the reduction, harmlessness and resource utilization of hazardous waste. However, persistent organic pollutants such as dioxins are inevitably generated during the incineration process. Dioxins are highly toxic, bioaccumulative and difficult to degrade, which is one of the key challenges in the promotion and application of hazardous waste incineration technology. In the existing technologies, the methods for controlling dioxins during the incineration process mainly include optimizing incineration conditions, adding inhibitors, end flue gas purification and chemical looping combustion, but each of these technical routes has obvious shortcomings.

[0003] In terms of optimizing incineration conditions, reducing incomplete combustion products by controlling temperature, residence time, turbulence, and excess air is a common industry practice. However, it is difficult to effectively suppress the heterogeneous resynthesis of dioxins during flue gas cooling, and the suppression effect has an upper limit.

[0004] Adding inhibitors is one of the most studied methods. The inorganic inhibitors used in the current technology are mainly sulfur-containing compounds, which can effectively inhibit the formation of dioxins in the furnace. However, as the flue gas flows, the inhibitors are rapidly consumed and cannot be regenerated, resulting in a decline in the inhibition effect over long-term operation.

[0005] Chemical looping combustion inhibits dioxin formation at the source by preventing fuel from directly contacting air and using an oxygen carrier to transfer oxygen. However, the oxygen carrier is easily poisoned and deactivated by chlorine-containing substances during the cycle, making it difficult to guarantee long-term operational stability.

[0006] In addition, incineration fly ash contains a large amount of chlorides and heavy metals. Existing technologies have solutions for recovering chloride salts from fly ash for resource utilization, but these solutions focus on fly ash post-treatment rather than dioxin inhibition during the incineration process.

[0007] It is evident that achieving efficient and sustained dioxin inhibition during incineration, while simultaneously reducing the cost of inhibitor use and system energy consumption, is a pressing technical challenge in the field of hazardous waste incineration treatment. Summary of the Invention

[0008] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a hazardous waste incineration disposal system and method based on supercombustion coupling and in-situ dioxin suppression, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: On one hand, the present invention provides a hazardous waste incineration system based on supercombustion coupling and in-situ dioxin suppression, comprising: The multi-stage zoned oxygen-controlled incinerator has a volatile matter zone, a main combustion zone, and a burnout zone arranged sequentially along the direction of hazardous waste material advance. There are heat insulation / flow guiding structures between adjacent zones. Each zone is equipped with an independent oxygen control mechanism, which includes a zone gas supply pipeline, a zone regulating valve, and an oxygen concentration sensor for independently controlling the oxygen concentration of each zone. A dynamic composite inhibitor in-situ generation and multi-stage injection system includes a chloride recovery unit, an inhibitor precursor storage tank, an in-situ reactor, a composite inhibitor storage tank, and a multi-stage injection pipeline. The chloride recovery unit is located in the tail flue of a multi-stage zoned oxygen-controlled incinerator and is used to recover chloride from the flue gas. The first inlet of the in-situ reactor is connected to the output of the chloride recovery unit, and the second inlet is connected to the inhibitor precursor storage tank, which is used to react chloride with the inhibitor precursor to generate a composite inhibitor. The composite inhibitor storage tank is connected to the outlet of the in-situ reactor. The multi-stage injection pipeline is connected to the composite inhibitor storage tank and has multiple injection points, which are respectively located in the volatilization zone, the main combustion zone, and / or the burnout zone of the incinerator. The multi-stage air distribution intelligent control module includes a main fan, pyrolysis gas / fuel gas distribution pipelines and independent gas supply branches for each zone, with flow regulating valve groups and airflow distributors installed on each gas supply branch; The full-process multi-parameter feedback control system includes multiple temperature sensors, oxygen concentration sensors, chlorine concentration sensors, and an online dioxin / precursor detector. The full-process multi-parameter feedback control system is connected to the oxygen regulation mechanism, the dynamic composite inhibitor in-situ generation and multi-stage injection system, and the multi-stage air distribution intelligent control module.

[0010] Preferably, the temperature control range of the volatile zone is 500~750℃, and the oxygen concentration control range is 3%~8%; the temperature control range of the main combustion zone is 850~1100℃, and the oxygen concentration control range is 6%~12%; the temperature control range of the burnout zone is 900~1050℃, and the oxygen concentration control range is 4%~8%.

[0011] Preferably, the chloride recovery unit includes a quench tower, a gas-liquid separator, a concentrator, and a crystallizer connected in sequence. The quench tower is used to quench the flue gas to 180~220°C, and the crystallizer is used to obtain chloride solids.

[0012] Preferably, the precursor stored in the inhibitor precursor storage tank is a compound of an amino compound and a sulfur compound, wherein the compound is a mixture of ammonium thiosulfate and melamine.

[0013] Preferably, the in-situ reactor is equipped with a stirring device and a heating element to allow the chloride to undergo a metathesis reaction with the inhibitor precursor at 150~250℃, dynamically generating a composite inhibitor.

[0014] Preferably, the full-process multi-parameter feedback control system adopts a multi-input multi-output PID control strategy or a fuzzy logic control strategy, and adjusts the oxygen supply, inhibitor injection rate and precursor ratio of each zone in real time according to the temperature, oxygen concentration and online monitoring data of dioxin / precursor concentration of each zone.

[0015] Preferably, it also includes an energy cascade recovery and exhaust gas purification unit, which includes a waste heat boiler and a bag filter. The flue gas inlet of the waste heat boiler is connected to the flue gas outlet of the multi-stage zoned oxygen-controlled incinerator, and its heat medium outlet is connected to the heating element of the in-situ reactor to provide at least part of the heat.

[0016] On the other hand, the present invention also provides a hazardous waste incineration disposal method based on the above system, comprising the following steps: Hazardous waste is fed into the volatile matter zone of a multi-stage zoned oxygen-controlled incinerator and subjected to anaerobic pyrolysis at 500-750°C and 3%-8% oxygen concentration to release combustible gases and inhibit the formation of dioxin precursors. The combustible gases and some undecomposed organic components produced by pyrolysis enter the main combustion zone and undergo high-temperature oxidation and decomposition at 850~1100℃ and oxygen concentration of 6%~12%. Unburned residue enters the burnout zone and is completely burned off under conditions of 900~1050℃ and 4%~8% oxygen concentration; During the incineration process, chlorides are recovered from the tail flue and react with inhibitor precursors in an in-situ reactor to dynamically generate composite inhibitors. The composite inhibitors are then injected into the volatilization zone, main combustion zone, and / or burnout zone of the multi-stage zoned oxygen-controlled incinerator through multi-stage injection pipelines. The full-process multi-parameter feedback control system monitors the temperature, oxygen concentration, chlorine concentration, and dioxin / precursor concentration of each zone in real time, and automatically adjusts the oxygen supply, inhibitor injection rate, and precursor ratio of each zone accordingly.

[0017] Preferably, the injection points of the composite inhibitor are set at least in the main combustion zone and the volatilization zone, and the injection volume is dynamically adjusted according to the real-time chlorine concentration in the main combustion zone and the dioxin precursor concentration in the main combustion zone.

[0018] Preferably, it also includes recovering the heat energy of the flue gas from the incinerator outlet using a waste heat boiler, and using part of the heat energy to maintain the reaction temperature of the in-situ reactor and preheat the inhibitor precursor.

[0019] The technical effects and advantages of this invention are as follows: 1. This invention sets up a volatile matter zone, a main combustion zone, and a burnout zone sequentially along the material feeding direction in a multi-stage zoned oxygen-controlled incinerator, and independently controls the oxygen concentration and temperature of each zone. This forms a gradient synergistic inhibition mode in which the volatile matter zone is oxygen-deficient to inhibit precursor formation, the main combustion zone is high-temperature and high-oxygen to thoroughly decompose organic matter, and the burnout zone is oxygen-supplemented for complete combustion. This systematically cuts off the synthesis chain of dioxins from precursors to intermediate products to final products, and significantly reduces the initial concentration of dioxins in flue gas. 2. This invention utilizes a chloride salt recovery unit to recover chloride from flue gas and performs a metathesis reaction with a compound precursor of amine and sulfur compounds in an in-situ reactor to dynamically generate a compound inhibitor. This achieves in-situ recycling of the inhibitor, effectively reducing dependence on external purchases and usage costs, and avoiding the problem of rapid failure of traditional inhibitors due to single consumption. 3. This invention uses a full-process multi-parameter feedback control system to monitor the temperature, oxygen concentration, chlorine concentration, and dioxin / precursor concentration of each zone in real time. It also uses a multi-input multi-output PID control strategy or a fuzzy logic control strategy to automatically adjust the oxygen supply, inhibitor injection rate, and precursor ratio. This achieves intelligent coordinated control of incineration conditions and inhibitor delivery, ensuring stable inhibition effect of the system under variable load conditions and improving the system's automation level and operational reliability. Attached Figure Description

[0020] Figure 1 This is a block diagram showing the connection of system modules in this invention.

[0021] Figure 2 This is a schematic diagram of the internal structure of the multi-stage zoned oxygen-controlled incinerator of the present invention.

[0022] Figure 3 This is a flow chart of the chloride recovery unit of the present invention.

[0023] Figure 4 This is a flowchart of the process method of the present invention.

[0024] The attached diagram is labeled as follows: 1. Multi-stage zoned oxygen-controlled incinerator; 2. Dynamic composite inhibitor in-situ generation and multi-stage injection system; 3. Multi-stage air distribution intelligent control module; 4. Full-process multi-parameter feedback control system; 5. Energy cascade recovery and exhaust gas purification unit. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0026] Example 1 As attached Figure 1-3 As shown, this embodiment provides a hazardous waste incineration system based on supercombustion coupling and in-situ dioxin inhibition. The system includes a multi-stage zoned oxygen-controlled incinerator 1, a dynamic composite inhibitor in-situ generation and multi-stage injection system 2, a multi-stage air distribution intelligent control module 3, and a full-process multi-parameter feedback control system 4.

[0027] The multi-stage zoned oxygen-controlled incinerator 1 is arranged in sequence with a volatile matter zone, a main combustion zone, and a burnout zone along the direction of hazardous waste material advance. There are heat insulation / flow guiding structures between adjacent zones to prevent excessive mixing of atmosphere and temperature between zones, thereby ensuring the independent controllability of each zone.

[0028] Each zone is equipped with an independent oxygen control mechanism, which includes a zone gas supply pipeline, a zone regulating valve, and an oxygen concentration sensor. Through this mechanism, the oxygen concentration of each zone can be independently controlled, so that each zone is within a different set range.

[0029] In this embodiment, the temperature control range of the volatile zone is 500~750℃, and the oxygen concentration control range is 3%~8%; the temperature control range of the main combustion zone is 850~1100℃, and the oxygen concentration control range is 6%~12%; and the temperature control range of the burnout zone is 900~1050℃, and the oxygen concentration control range is 4%~8%.

[0030] The dynamic composite inhibitor in-situ generation and multi-stage injection system 2 includes a chloride recovery unit, an inhibitor precursor storage tank, an in-situ reactor, a composite inhibitor storage tank, and a multi-stage injection pipeline.

[0031] The chloride recovery unit is located in the tail flue of the multi-stage zoned oxygen-controlled incinerator 1 and is used to recover chlorides from the flue gas. Specifically, the chloride recovery unit includes a quench tower, a gas-liquid separator, a concentrator, and a crystallizer connected in sequence. The quench tower is used to quench the flue gas to 180~220℃ to avoid the temperature window for dioxin resynthesis. The chlorine-containing substances in the flue gas are absorbed by the spray liquid to form a chlorine-containing solution. After being separated by the gas-liquid separator, the solution enters the concentrator for concentration. The concentrated solution is then sent to the crystallizer for crystallization to obtain chloride solids.

[0032] The inhibitor precursor is stored in the inhibitor precursor storage tank. In this embodiment, the precursor is a compound of amine and sulfur compounds, specifically a mixture of ammonium thiosulfate and melamine.

[0033] The first inlet of the in-situ reactor is connected to the output of the chloride recovery unit, which receives the chloride solid obtained from the crystallizer. The second inlet of the in-situ reactor is connected to the inhibitor precursor storage tank, which receives a mixture of ammonium thiosulfate and melamine. The in-situ reactor is equipped with a stirring device and a heating element to allow the chloride and inhibitor precursor to undergo a metathesis reaction at a temperature of 150~250℃, dynamically generating a composite inhibitor.

[0034] The compound inhibitor storage tank is connected to the outlet of the in-situ reactor and is used to store the generated compound inhibitor.

[0035] The multi-stage injection pipeline connects to the composite inhibitor storage tank and has multiple injection points. These injection points are respectively set in the volatilization zone, main combustion zone and / or burnout zone of the incinerator. Each injection point is equipped with a metering pump and an atomizing nozzle to spray the composite inhibitor into the corresponding zone in an atomized form.

[0036] The multi-stage air distribution intelligent control module 3 includes a main fan, pyrolysis gas and combustion gas distribution pipelines, and independent gas supply branches for each zone. Each gas supply branch is equipped with a flow regulating valve group and an airflow distributor. Through this module, combustion gas with the required oxygen concentration can be independently supplied to different zones of the incinerator.

[0037] The full-process multi-parameter feedback control system 4 includes multiple temperature sensors, oxygen concentration sensors, chlorine concentration sensors, and dioxin / precursor online detectors. These sensors and detectors are respectively arranged in key locations such as each zone of the incinerator, flue gas outlet, in-situ reactor inlet and outlet.

[0038] The full-process multi-parameter feedback control system 4 is connected to the oxygen regulation mechanism, the dynamic composite inhibitor in-situ generation and multi-stage injection system 2, and the multi-stage air distribution intelligent control module 3. The full-process multi-parameter feedback control system 4 adopts a multi-input multi-output PID control strategy or a fuzzy logic control strategy. Based on the temperature, oxygen concentration and online monitoring of dioxin / precursor concentration data of each zone, it adjusts the oxygen supply, inhibitor injection rate and precursor ratio of each zone in real time.

[0039] The system in this embodiment also includes an energy cascade recovery and exhaust gas purification unit 5, which includes a waste heat boiler and a bag filter. The flue gas inlet of the waste heat boiler is connected to the flue gas outlet of the multi-stage zone oxygen-controlled incinerator 1 to recover the heat energy of the high-temperature flue gas. The heat medium outlet of the waste heat boiler is connected to the heating element of the in-situ reactor to provide at least part of the heat to the in-situ reactor, thereby realizing the cascade utilization of energy in the system.

[0040] After the flue gas recovers heat through a waste heat boiler, it enters a bag filter for dust removal and finally meets emission standards.

[0041] Example 2 As attached Figure 4 As shown, this embodiment also provides a hazardous waste incineration disposal method based on the above system, specifically including the following steps: First, the pretreated hazardous waste is sent to the volatile matter zone of the multi-stage zoned oxygen-controlled incinerator 1. In the volatile matter zone, the temperature is controlled at 500~750℃ and the oxygen concentration is 3%~8%, so that the hazardous waste is pyrolyzed under hypoxic conditions to release combustible gases. The hypoxic environment in this process can effectively inhibit the formation of dioxin precursors, namely chlorophenol and chlorobenzene.

[0042] The combustible gases and some undecomposed organic components produced by pyrolysis then enter the main combustion zone. In the main combustion zone, the temperature is controlled at 850~1100℃ and the oxygen concentration is 6%~12%, so that the combustible gases and organic matter are completely oxidized and decomposed under high temperature and oxygen-rich conditions, ensuring that dioxins and their precursors are completely destroyed.

[0043] Unburned residue continues to enter the burnout zone, where the temperature is controlled at 900~1050℃ and the oxygen concentration at 4%~8%, so that the remaining carbon black and carbon monoxide and other combustibles are fully burned, further improving combustion efficiency.

[0044] During the incineration process described above, the chloride recovery unit continuously recovers chlorides from the tail flue. Specifically, the flue gas is quenched to 180-220°C in a quench tower, and the chlorine-containing scrubbing liquid is separated into gas and liquid, concentrated, and crystallized to obtain chloride solids. The chloride solids undergo a metathesis reaction with the inhibitor precursor in the in-situ reactor, namely a mixture of ammonium thiosulfate and melamine, at 150-250°C to dynamically generate composite inhibitors. The generated composite inhibitors are injected into the volatilization zone, main combustion zone, and / or burnout zone of the incinerator through multi-stage injection pipelines.

[0045] In this embodiment, the injection points of the composite inhibitor are set at least in the main combustion zone and the volatilization zone, and the injection amount is dynamically adjusted according to the real-time chlorine concentration in the main combustion zone and the dioxin precursor concentration in the main combustion zone.

[0046] The full-process multi-parameter feedback control system monitors the temperature, oxygen concentration, chlorine concentration, and dioxin / precursor concentration of each zone in real time, and automatically adjusts the oxygen supply, inhibitor injection rate, and inhibitor precursor ratio of each zone based on the monitoring data, so that the system is always in the optimal operating state.

[0047] In addition, the method in this embodiment also includes recovering the heat energy of the flue gas at the incinerator outlet using a waste heat boiler. Part of the recovered heat energy is used to maintain the reaction temperature of the in-situ reactor and to preheat the inhibitor precursor, thereby reducing the system energy consumption.

[0048] The dioxin emission concentration of the flue gas treated by the above method is far below the national standard limit, the system operates stably, and the consumption of inhibitors is reduced by 30% to 50% compared with the traditional method of purchasing externally.

[0049] Example 3 This embodiment is basically the same as Embodiment 1, except that: the working temperature of the in-situ reactor is controlled at 200℃±10℃, the metathesis reaction time of chloride and inhibitor precursor is 30min, the multi-stage injection pipeline has two injection points in the volatile zone, three injection points in the main combustion zone, and no injection points in the burnout zone, and the full-process multi-parameter feedback control system 4 adopts a fuzzy logic control strategy to adjust the inhibitor injection amount in advance according to the online detection trend of dioxin precursor concentration change.

[0050] Industrial applicability: The hazardous waste incineration system and method of the present invention are applicable to the incineration treatment of various types of hazardous waste, especially hazardous waste with high chlorine content and easy dioxin generation. Through the synergistic effect of multi-level zoned oxygen control, dynamic composite inhibitor in-situ generation and multi-level injection, and intelligent feedback control, the system can significantly suppress the generation and emission of dioxins, while reducing the cost of inhibitor use and realizing energy cascade utilization. The system has a compact structure, a high degree of automation, and good prospects for industrial application.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hazardous waste incineration system based on supercombustion coupling and in-situ dioxin suppression, characterized in that: include: The multi-stage zone oxygen-controlled incinerator (1) is provided with a volatile zone, a main combustion zone and a burnout zone in sequence along the direction of hazardous waste material advance. There is a heat insulation / flow guiding structure between adjacent zones. Each zone is provided with an independent oxygen control mechanism. The oxygen control mechanism includes a zone gas supply pipeline, a zone regulating valve and an oxygen concentration sensor, which are used to independently control the oxygen concentration of each zone. The dynamic composite inhibitor in-situ generation and multi-stage injection system (2) includes a chloride recovery unit, an inhibitor precursor storage tank, an in-situ reactor, a composite inhibitor storage tank and a multi-stage injection pipeline. The chloride recovery unit is located at the tail flue of the multi-stage zoned oxygen-controlled incinerator (1) and is used to recover chloride from the flue gas. The first inlet of the in-situ reactor is connected to the output end of the chloride recovery unit, and the second inlet is connected to the inhibitor precursor storage tank. The chloride reacts with the inhibitor precursor to generate a composite inhibitor. The composite inhibitor storage tank is connected to the outlet of the in-situ reactor. The multi-stage injection pipeline is connected to the composite inhibitor storage tank and has multiple injection points, which are respectively located in the volatilization zone, the main combustion zone and / or the burnout zone of the incinerator. The multi-level air distribution intelligent control module (3) includes a main fan, pyrolysis gas / fuel gas distribution pipeline and independent gas supply branches for each zone, and each gas supply branch is equipped with a flow regulating valve group and an airflow distributor. The full-process multi-parameter feedback control system (4) includes multiple temperature sensors, oxygen concentration sensors, chlorine concentration sensors and dioxin / precursor online detectors. The full-process multi-parameter feedback control system (4) is connected to the oxygen regulation mechanism, the dynamic composite inhibitor in-situ generation and multi-stage injection system (2), and the multi-stage air distribution intelligent regulation module (3) respectively.

2. The hazardous waste incineration system according to claim 1, characterized in that: The temperature control range of the volatile zone is 500~750℃, and the oxygen concentration control range is 3%~8%; The temperature control range of the main combustion zone is 850~1100℃, and the oxygen concentration control range is 6%~12%. The temperature control range of the burnout zone is 900~1050℃, and the oxygen concentration control range is 4%~8%.

3. The hazardous waste incineration system according to claim 1, characterized in that: The chloride recovery unit includes a quench tower, a gas-liquid separator, a concentrator, and a crystallizer connected in sequence. The quench tower is used to quench the flue gas to 180~220°C, and the crystallizer is used to obtain chloride solids.

4. The hazardous waste incineration system according to claim 1, characterized in that: The precursor stored in the inhibitor precursor storage tank is a compound of amine and sulfur compounds, which is a mixture of ammonium thiosulfate and melamine.

5. The hazardous waste incineration system according to claim 1, characterized in that: The in-situ reactor is equipped with a stirring device and a heating element, which are used to cause the chloride and the inhibitor precursor to undergo a metathesis reaction at 150~250℃, dynamically generating a composite inhibitor.

6. The hazardous waste incineration system according to claim 1, characterized in that: The full-process multi-parameter feedback control system (4) adopts a multi-input multi-output PID control strategy or a fuzzy logic control strategy. Based on the temperature, oxygen concentration and online monitoring data of dioxin / precursor concentration of each zone, it adjusts the oxygen supply, inhibitor injection rate and precursor ratio of each zone in real time.

7. The hazardous waste incineration system according to claim 1, characterized in that: It also includes an energy cascade recovery and exhaust gas purification unit (5), which includes a waste heat boiler and a bag filter. The flue gas inlet of the waste heat boiler is connected to the flue gas outlet of the multi-stage zone oxygen-controlled incinerator (1), and its heat medium outlet is connected to the heating element of the in-situ reactor to provide at least part of the heat.

8. A method for hazardous waste incineration based on the system described in any one of claims 1-7, characterized in that: Includes the following steps: Hazardous waste is sent to the volatile zone of a multi-stage zoned oxygen-controlled incinerator (1) and subjected to anaerobic pyrolysis at 500~750℃ and 3%~8% oxygen concentration to release combustible gases and inhibit the formation of dioxin precursors. The combustible gases and some undecomposed organic components produced by pyrolysis enter the main combustion zone and undergo high-temperature oxidation and decomposition at 850~1100℃ and oxygen concentration of 6%~12%. Unburned residue enters the burnout zone and is completely burned off under conditions of 900~1050℃ and 4%~8% oxygen concentration; During the incineration process, chloride is recovered from the tail flue and reacts with the inhibitor precursor in the in-situ reactor to dynamically generate a composite inhibitor. The composite inhibitor is then injected into the volatilization zone, main combustion zone and / or burnout zone of the multi-stage zoned oxygen-controlled incinerator (1) through a multi-stage injection pipeline. The full-process multi-parameter feedback control system (4) monitors the temperature, oxygen concentration, chlorine concentration and dioxin / precursor concentration of each zone in real time, and automatically adjusts the oxygen supply, inhibitor injection rate and precursor ratio of each zone accordingly.

9. The hazardous waste incineration disposal method according to claim 8, characterized in that: The injection points of the composite inhibitor are set at least in the main combustion zone and the volatilization zone, and the injection volume is dynamically adjusted according to the real-time chlorine concentration in the main combustion zone and the dioxin precursor concentration in the main combustion zone.

10. The hazardous waste incineration disposal method according to claim 8, characterized in that: It also includes using waste heat boilers to recover the heat energy from the flue gas at the incinerator outlet, and using some of the heat energy to maintain the reaction temperature of the in-situ reactor and preheat the inhibitor precursor.

Images