Combustion control method for garbage incinerator

Abstract

The invention discloses a garbage incinerator combustion control method which comprises the following steps: S1, defining a load ratio, and respectively turning to S2 and S3; s2, calculating an O2 target value according to CEMS CO; calculating the adjusting intensity M, and increasing the secondary air volume when M is greater than 0; otherwise, reducing the secondary air volume; s3, when the load ratio is larger than (1 + b), the primary air volume is reduced, and fire grate slow combustion is conducted; when the load ratio is less than (1-b), turning to S4; s4, when CO is larger than the adjusting threshold value, the step S5 is executed, and otherwise, the step S6 is executed; s5, the secondary air volume is increased, when the load rate is larger than a, the primary air volume is reduced, and the fire grate slowly combusts; otherwise, not adjusting; s6, the primary air volume is increased, and the fire grate promotes combustion; and whether the time from the time when the CO is larger than the adjusting threshold value last time is larger than t1 or not is judged, if yes, the secondary air volume is maintained, and if not, the secondary air quits CO control and returns to O2 control. The problems of stable control and efficient air distribution of complex working conditions of the garbage incinerator can be solved, and the stability and economical efficiency of operation control are improved.

Description

Technical Field

[0001] This invention belongs to the field of combustion control technology, specifically relating to a combustion control method for a waste incinerator. Background Technology

[0002] Mechanical grate incineration technology, primarily based on mechanical grate furnaces, is gradually becoming the mainstream technology for harmless waste treatment. Mechanical grate incinerators offer significant advantages, including strong adaptability to different types of waste, high processing efficiency, thorough thermal decomposition of hazardous substances, and saving land resources. However, due to the complex and variable composition of municipal solid waste, its low calorific value, and the difficulty in online monitoring of waste properties, combustion control in incinerators has always been a challenge and pain point for the industry. The level of automation in waste incinerators is significantly lower than that of coal-fired, gas-fired, oil-fired, and biomass boilers. Furthermore, with increasing industry competition and declining subsidies, improving economic efficiency through optimized operation is also a major challenge facing the industry.

[0003] Driven by the practical demands for automation, intelligence, and efficiency, increasing research focuses on the operating mechanisms and control of incinerators. However, existing solutions often employ simple parameter feedback control logic and fixed-value operating parameter settings, lacking a deep understanding of the complex relationships between operating parameters. Consequently, the results are generally unsatisfactory, particularly regarding the control of CO and O2, which are crucial for combustion air distribution, where mature and flexible control models are currently lacking. Furthermore, more and more local flue gas pollutant control standards are beginning to promote shorter-period control modes. Summarizing combustion control modes suitable for mechanical grate incinerators from extensive operational control experience is a hot research direction in the industry.

[0004] CN 101484753B discloses a grate-type incinerator and its combustion control method, introducing a method for regulating and controlling the main steam flow, feed, and air distribution by utilizing furnace temperature, O2, and CO. This method can rapidly restore steam flow by taking advantage of short temperature diagnosis time, and quickly adjust secondary air by detecting whether O2 and CO have reached the regulation threshold, thus maintaining stable combustion. However, this method has a relatively simple adjustment method for load and air distribution, making it difficult to cope with complex operating conditions.

[0005] CN 104748129A discloses a grate-type incinerator system that can achieve low-air-ratio combustion without deteriorating the combustion state. This technology utilizes flue gas recirculation and incorporates an oxygen concentration meter within the combustion chamber. By reducing the time delay in oxygen concentration diagnosis, the secondary air volume is adjusted, thereby achieving efficient combustion control. However, this method remains relatively simple, primarily relying on O2 regulation without considering more complex operating conditions such as CO and load fluctuations.

[0006] CN 111121872B discloses a device and method for real-time monitoring and adjustment of combustion conditions in a furnace. Two identical sensors and receivers are installed at different locations in the combustion chamber exhaust duct. Feeding and oxygen-containing gas control are based on the differences between the signals. The sensor types can be flame, temperature, pressure, O2, CO, or CO2. This method can measure changes in the combustion process between the two sensors; however, the diagnostic parameters are relatively limited, and the sensor requirements are high. It is only suitable for scenarios with low operational control requirements, such as oil-fired and gas-fired boilers, and its adaptability to more complex furnace control is relatively limited. Summary of the Invention

[0007] Technical problem solved: To address the above-mentioned technical problems, this invention provides a combustion control method for a waste incinerator, which can solve the problems of stable control and efficient air distribution under complex operating conditions of waste incinerators, and improve the stability and economy of operation control.

[0008] Technical solution: A method for combustion control in a waste incinerator, comprising the following steps: S1. Define the load ratio as the ratio of the actual heat load to the target heat load, then switch to S2 for O2 control and to S3 for heat load control. S2. Detect CO concentration using a continuous emission monitoring system installed inside the chimney, and calculate the cumulative CO emissions during the control period. Then, the target O2 value is calculated; the O2 concentration in the flue gas is measured using an oxygen meter installed in the waste heat boiler, and the O2 difference is obtained as O2 difference = target O2 value - O2 concentration, and then the adjustment intensity M is calculated, M = rounded down [O2 difference / adjustment level p]; when M > 0, the secondary air volume is increased; otherwise, the secondary air volume is decreased. S3. Define the load buffer coefficient as b, and determine the load ratio range. When the load ratio is greater than (1+b), reduce the primary air volume and the grate adopts slow combustion operation; when the load ratio is less than (1-b), switch to S4 for CO control. S4. Use a laser gas analyzer installed in the flue of the waste heat boiler to detect the CO concentration, calculate the moving average of CO, and set an adjustment threshold. When the moving average of CO is greater than the adjustment threshold, proceed to S5; otherwise, proceed to S6. S5. Increase the secondary air volume and simultaneously determine the load rate. The load rate is defined as the ratio of the actual load to the rated load. The load rate determination threshold is a. When the load rate > a, reduce the primary air volume and the grate adopts slow combustion operation; otherwise, do not adjust the primary air and grate. S6. Increase the primary air volume and the grate adopts combustion promotion operation; at the same time, determine whether the time since the last occurrence of CO moving average value > adjustment threshold is greater than the set adjustment effect protection time t1. If yes, maintain the increase effect of secondary air volume in S5. Otherwise, the secondary air exits the CO control state and returns to the O2 control state.

[0009] Preferably, the cumulative CO emissions during the S2 period are... The calculation method is as follows:

[0010] Where ti is the starting point of the control period for CO concentration detection by the continuous emission monitoring system, ti+t is the current time, the total duration of the control period is t0, and a control period cycle is completed when t=t0.

[0011] Preferably, the method for calculating the target O2 value in S2 is as follows:

[0012] Where k is an adjustment factor, and its value ranges from 0 to k to 1; L CO This indicates the CO emission limit for a given period.

[0013] Furthermore, the O2 setpoint in the high-efficiency combustion zone ranges from 4 to 6, while the O2 setpoint in the comfort combustion zone ranges from 6 to 9. The O2 setpoint in the comfort combustion zone is always greater than that in the high-efficiency combustion zone.

[0014] Furthermore, based on the influence of O2 concentration on CO concentration, the combustion process is divided into an incomplete combustion zone, a high-efficiency combustion zone, and a comfortable combustion zone, with the O2 concentration increasing sequentially between the corresponding zones; and the average CO emission d corresponding to the O2 concentration at the boundary between the high-efficiency combustion zone and the incomplete combustion zone. CO Less than the CO emission limit L CO .

[0015] Preferably, in S2, the adjustment level p represents the fineness of O2 adjustment, with a value range of 0.3 to 0.8; the increase in secondary air ΔQ sec3 =f3(M, p)*load ratio, reduction in secondary air ΔQ sec4 =f4(M, p)*load ratio.

[0016] Preferably, the value of b in S3 ranges from 0.02 to 0.05, and the reduction in primary wind ΔQ pri6 =f6(M)*load ratio.

[0017] Preferably, in the calculation of the moving average of CO in S4, the time span of the moving average is 3~5s; the adjustment threshold is set to 200~600ppm.

[0018] Preferably, in step S5, the moving average CO concentration is divided into several levels from the adjustment threshold to the highest concentration. The level at which the current moving average CO concentration exceeds the adjustment threshold is defined as the CO exceedance intensity N, and the increase in secondary wind is ΔQ. sec1 =f1(N)*load rate; reduction in primary air volume ΔQ pri2 =f2(N)*load rate; the value of a ranges from 0.7 to 0.8.

[0019] Preferably, in S6, t1 ranges from 20 to 60 seconds, and the increase in primary wind ΔQ pri5 =f5(M)*load ratio.

[0020] Beneficial Effects: This invention, based on multi-parameter coupled regulation and dynamic O2 target value management, can flexibly and effectively diagnose and manage the combustion process. Compared with traditional technologies, it offers higher efficiency and stability in CO, O2, and load control. In O2 control, it better balances efficiency and safety, dynamically adjusting the O2 target value based on real-time CO emissions. The control mode according to this invention achieves a higher level of automation, reduces manual intervention, and enhances adaptability to complex and variable municipal solid waste combustion conditions. Attached Figure Description

[0021] Figure 1 This is a flowchart of the present invention; Figure 2 This is a schematic diagram showing the installation position of the testing instrument used in this invention; The numbers in the diagram represent the following: 1-Incinerator; 2-Feed inlet; 3-Ash hopper; 4-Primary air for drying section; 5-Primary air for combustion section; 6-Primary air for burnout section; 7-Slag discharge port; 8-Grate; 9-Secondary air; 10-Waste heat boiler; 11-Flue gas purification system; 12-Chimney; 100-Laser gas analyzer; 101-Oxygen meter; 102-Continuous emission monitoring system (CEMS).

[0022] Figure 3 This is a schematic diagram showing the relationship between the O2 setpoint location and CO. Figure 4 This is a schematic diagram illustrating how the target O2 value changes over time and as CO fluctuates. Figure 5 This is a schematic diagram of the actual operating effect of Example 1. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 As shown, a method for controlling combustion in a waste incinerator includes the following steps: S1. Define the load ratio as the ratio of the actual heat load to the target heat load, then switch to S2 for O2 control and to S3 for heat load control.

[0025] S2. The goal of O2 control is to keep O2 stably within a certain range of the target O2 value.

[0026] The target O2 value is a directional indicator that guides the combustion control system to automatically adjust O2 levels. The air distribution control system automatically adjusts the air distribution based on the difference between the target O2 value and the actual O2 level. The setting of the target O2 value directly affects the air supply volume, and thus directly impacts the operating economy and the amount of pollutants generated. Generally speaking, under the premise of complete combustion, O2 should be as low as possible to achieve the best overall economic performance of the unit.

[0027] Currently, all combustion control methods use a fixed value to set the O2 target value. That is, a target value is set based on experience at the beginning of operation and is not adjusted during operation. However, this combustion control mode is more suitable for coal-fired, gas-fired, and oil-fired boilers, but it is difficult to adapt to the characteristics of municipal solid waste, which has complex and variable composition, low calorific value, and large combustion fluctuations.

[0028] Therefore, this invention designs a calculation method for dynamically adjusting the O2 target value based on CO emission values: CO concentration is detected using a continuous emission monitoring system installed inside the chimney, and the cumulative CO emissions during the control period are calculated. Then, the target value of O2 is calculated.

[0029] Cumulative CO emissions during the period The calculation method is as follows:

[0030] Where ti is the starting point of the control period for CO concentration detection by the continuous emission monitoring system, ti+t is the current time, the total duration of the control period is t0, and a control period cycle is completed when t=t0.

[0031] The method for calculating the target value of O2 is as follows:

[0032] Among them, L CO This represents the CO emission limit for a given period; k is an adjustment factor, with a value range of 0 < k < 1; as k decreases, the O2 target value increases accordingly. The more gradual the change trend; as k increases, the O2 target value increases accordingly. The steeper the trend of change.

[0033] According to this calculation formula, when When the initial value is 0, the target O2 value is equal to the O2 setpoint in the high-efficiency combustion zone. The closer to the CO emission limit L CO The closer the O2 target value is to the O2 setpoint in the comfort combustion zone, the higher the O2 target value will be. The type of change that increases with each increase is exponential.

[0034] Based on general combustion experience of mechanical grate furnaces, under different furnace types and different waste composition, the O2 setpoint range for the high-efficiency combustion zone is 4-6, and the O2 setpoint range for the comfort combustion zone is 6-9. Moreover, the O2 setpoint for the comfort combustion zone is always greater than that for the high-efficiency combustion zone.

[0035] like Figure 3 As shown, based on the relationship between CO and O2, the average concentration of CO emissions decreases exponentially with increasing O2 concentration. The combustion process can be divided into incomplete combustion, high-efficiency combustion, and comfortable combustion zones based on the influence of O2 concentration on CO concentration, with the O2 concentration increasing sequentially within each zone. The specific range of the combustion zones is qualitative, not quantitative, and varies slightly depending on the incinerator and the calorific value of the waste fed into the incinerator, but the general trend is consistent. Based on experience, the average CO emission d corresponding to the O2 concentration at the boundary between the high-efficiency combustion zone and the incomplete combustion zone is... CO Less than the CO emission limit L CO .

[0036] like Figure 4 As shown, according to the O2 target value algorithm, the O2 target value at the beginning of a time period is equal to the O2 setpoint of the high-efficiency combustion zone. At this time, the combustion process is in a low-O2, high-efficiency combustion state, resulting in good unit operating economy. However, the CO concentration may be slightly higher. As the operating time changes, the CEMS detects the cumulative CO emissions during the time period. The O2 target value begins to increase slowly, if... There have been significant increases in emissions, rapidly approaching the CO emission limit (L). CO If the target O2 value is increased exponentially, it will rapidly approach the comfort zone O2 set point, thereby ensuring that CO emissions always meet the standards and controlling the risk of CO exceeding the standard.

[0037] if If there is no significant increase, the target O2 value will remain within the efficient combustion zone for a long time.

[0038] In the next time period, the O2 target value will be restored to the O2 setpoint in the high-efficiency combustion zone, and the CEMS will monitor the cumulative CO emissions during the period. The integration calculation also restarts from 0, and the running loop is repeated.

[0039] The O2 concentration in the flue gas is measured using an oxygen meter installed in the waste heat boiler. The O2 difference is obtained as O2 target value - O2 concentration. Then, the adjustment intensity M is calculated, where M = rounded down [O2 difference / adjustment level p]. The adjustment level p represents the fineness of O2 adjustment, with a value range of 0.3 to 0.8. The smaller the p value, the more frequent the O2 adjustment and the smoother the adjustment process.

[0040] When M > 0, it indicates that the current O2 value is relatively low compared to the target value, and the secondary air volume needs to be increased; the increase in secondary air volume ΔQ sec3 =f3(M, p)*load ratio. This function can be linear, polynomial, etc., and generally satisfies the rule: the larger M and p are, the higher the load ratio, and ΔQ... sec3 The larger.

[0041] When M < 0, it indicates that the current O2 value is relatively high compared to the target value, and the secondary air volume needs to be reduced; the amount of reduction in secondary air volume ΔQ sec4 =f4(M, p)*load ratio. This function can be linear, polynomial, etc., and generally satisfies the rule: the larger M and p are, the higher the load ratio, and ΔQ... sec4 The larger.

[0042] S3. According to the combustion mechanism of a mechanical grate furnace, the heat load is mainly regulated by the primary air and the grate. Increasing the primary air and using the grate to promote combustion will increase the combustion intensity and thus the heat load; decreasing the primary air and using the grate to slow combustion will decrease the combustion intensity and thus the heat load. The goal of heat load control is to stably control the heat load within a certain range of the target heat load.

[0043] Define a load buffer factor as b and determine the load ratio range. The load buffer factor b is generally taken as 0.02~0.05. The smaller the value, the narrower the range of free load fluctuation, and the more frequent the adjustment.

[0044] If the load ratio > (1+b), then load reduction measures are required: reduce the primary air volume and implement slow combustion operation on the grate. The reduction in primary air volume is a function of M and the load ratio, i.e., ΔQ. pri6 =f6(M)*load ratio, this function can be linear, polynomial, etc., and generally satisfies the rule: the larger M is, the higher the load ratio, ΔQ pri6 The larger.

[0045] If the load ratio is less than (1-b), it indicates that the load is low and needs to be increased. When the load ratio is less than (1-b), switch to S4 for CO control.

[0046] S4. The CO concentration in flue gas measured by the laser gas analyzer is the most crucial indicator of combustion completeness. The first step in the laser analyzer's CO calculation is to perform a moving average calculation. The typical time span for this moving average is 3-5 seconds to filter out abnormal fluctuations. Then, it is determined whether the CO concentration calculated using the moving average exceeds the adjustment threshold. The adjustment threshold can be set according to control requirements, and a range of 200-600 ppm is generally recommended. The lower the value, the lower the trigger threshold for adjustment, and the better the CO control effect. If the laser CO concentration exceeds the adjustment threshold, proceed to S5 for determining the intensity of the exceedance; otherwise, proceed to S6.

[0047] S5. The moving average CO concentration is manually divided into several levels from the adjustment threshold to the highest concentration. The higher the CO concentration, the more levels are required. The number of levels can be determined based on the adjustment needs, with a recommended range of 1 to 6. The more levels, the more precise the CO adjustment. The level at which the current moving average CO concentration exceeds the adjustment threshold is defined as the CO exceedance intensity N. After determining the CO exceedance intensity, the secondary air volume is increased, with the increase amount ΔQ. sec1 =f1(N)*Load Rate. The load rate is defined as the ratio of the actual load to the rated load. This function can be linear, polynomial, etc., and generally satisfies the rule: the larger N is, the higher the load rate, ΔQ. sec1 The larger.

[0048] To enhance the synergistic adjustment effect and improve the safety of CO control, primary air and grate may also need to participate in CO control. In this case, a load rate determination is first performed, with a threshold value of 'a' ranging from 0.7 to 0.8. The significance of this determination is that when the load rate is high, the risk of CO exceeding the standard is greater due to the high combustion intensity of the grate, requiring simultaneous reduction of primary air volume and slowing of grate combustion. If the load rate is lower than the determination threshold, the intensity of CO exceeding the standard may be lower, and controlling CO is relatively easier when the load is low. In this case, synergistic adjustment of primary air and grate is necessary to prevent further load reduction and increase the risk of operational instability.

[0049] Specifically, when the load factor is greater than a, the primary air volume in the combustion section is reduced by ΔQ. pri2 =f2(N)*load factor. This function can be linear, polynomial, etc., and generally satisfies the rule: the larger N is, the higher the load factor, ΔQ pri2 The larger the volume of air, the better; and the grate should be operated with slow combustion, such as reducing the number of times the grate is turned or slid in the combustion section. Otherwise, the primary air and grate should not be adjusted.

[0050] S6. If the laser CO is less than the adjustment threshold, increase the primary air volume by ΔQ. pri5 =f5(M)*load ratio; the grate adopts combustion-promoting operation, such as increasing the frequency of grate sliding and turning.

[0051] Simultaneously, it checks whether the time since the last occurrence of CO moving average exceeding the adjustment threshold is greater than the set adjustment effect protection time t1. t1 can be set as needed, with a recommended value range of 20~60s. If "yes", the increase in secondary air volume in S5 remains unchanged; if "no", the secondary air exits the CO control state and returns to the O2 control state. Example 1

[0052] like Figure 2 As shown, this embodiment targets a conventional waste incinerator system, which includes an incinerator, grate, ash hopper, primary air, secondary air, feed inlet, slag outlet, waste heat boiler, flue gas purification system, and chimney. The ash hopper is internally divided into three independent chambers: a drying section, a combustion section, and a burnout section, located below the drying, combustion, and burnout sections of the grate, respectively. These chambers collect ash and slag falling from the grate gaps and also serve as primary air channels. The primary air from the drying, combustion, and burnout sections passes sequentially through the three chambers of the ash hopper, and the flow rate of the primary air in each section can be independently adjusted.

[0053] Primary air passes through the grate and comes into contact with the waste material layer, undergoing processes such as drying, pyrolysis, combustion, and burnout. Incompletely combusted flue gas flows upward and mixes with secondary air. Residual combustibles and harmful substances in the flue gas undergo secondary combustion under intense mixing. The completely combusted flue gas enters the waste heat boiler for waste heat recovery. The flue gas after heat utilization enters the flue gas purification system to purify harmful components such as dust, SO2 (sulfur dioxide), HCl (hydrogen chloride), NOx (nitrogen oxides), CO (carbon monoxide), and dioxins. After purification, the flue gas is discharged through the chimney.

[0054] A laser gas analyzer capable of real-time online measurement of CO in flue gas is installed inside the waste heat boiler. The laser gas analyzer is installed in the middle of the flue gas duct, 5-10 seconds above the secondary air nozzle. This installation range has the combined advantages of complete combustion, relatively thorough mixing, and relatively low flue gas temperature, ensuring that the CO concentration detected by the laser gas analyzer is representative, the combustion diagnosis delay is short, and the instrument can operate stably for a long time. A zirconia oxygen analyzer is also installed inside the waste heat boiler to measure the O2 concentration in the flue gas. A continuous emission monitoring system (CEMS) is installed inside the chimney to monitor the concentration of pollutants and other parameters in the flue gas.

[0055] Specifically, the laser gas analyzer is installed at a location where the secondary air and flue gas flow time is approximately 6 seconds, i.e., the upper-middle part of the waste heat boiler's second flue. The zirconia oxygen analyzer is installed near the waste heat boiler outlet, and the CEMS is installed on the chimney. The laser analyzer's CO adjustment threshold is 300 ppm, the maximum CO exceedance intensity is 4, and when the laser analyzer's CO exceeds 3000 ppm, it is defined as level 4. When CO is between 300 and 3000 ppm, it is evenly divided into 3 levels. The load rate judgment threshold 'a' used to determine whether primary air and grate participation in regulation is required is 0.8. The CO control delay protection time 't1' is 30 seconds, and the CO control period length is 1 hour, i.e., 3600 seconds. The O2 setpoint for the high-efficiency combustion zone is 4.5, the O2 setpoint for the comfort combustion zone is 8, the adjustment factor 'k' is 0.3, and the CO regulation level value 'p' is 0.5. The load buffer coefficient 'b' for heat load regulation is 0.05. In the formula for air volume adjustment, f1, f2, f3, f4, f5, and f6 are all linear functions.

[0056] Actual operation and adjustment effects are as follows Figure 5 As shown, because O2 adopts a dynamic target value and a mechanism that adjusts according to the CO and load response of the laser instrument, it has relatively stable operating fluctuations. At the beginning of each period, O2 is low, and as CEMS CO accumulates, the oxygen control index gradually increases, which can ensure that the time average value is always in a stable and controllable state, while taking into account the economic efficiency of operation.

Claims

1. A method for controlling combustion in a waste incinerator, characterized in that, The steps include the following: S1. Define the load ratio as the ratio of the actual heat load to the target heat load, then switch to S2 for O2 control and to S3 for heat load control. S2. Detect CO concentration using a continuous emission monitoring system installed inside the chimney, and calculate the cumulative CO emissions during the control period. Then, the target O2 value is calculated; the O2 concentration in the flue gas is measured using an oxygen meter installed in the waste heat boiler, and the O2 difference is obtained as O2 difference = target O2 value - O2 concentration, and then the adjustment intensity M is calculated, M = rounded down [O2 difference / adjustment level p]; when M > 0, the secondary air volume is increased; otherwise, the secondary air volume is decreased. S3. Define the load buffer coefficient as b, and determine the load ratio range. When the load ratio is greater than (1+b), reduce the primary air volume and the grate adopts slow combustion operation; when the load ratio is less than (1-b), switch to S4 for CO control. S4. Use a laser gas analyzer installed in the flue of the waste heat boiler to detect the CO concentration, calculate the moving average of CO, and set an adjustment threshold. When the moving average of CO is greater than the adjustment threshold, proceed to S5; otherwise, proceed to S6. S5. Increase the secondary air volume and simultaneously determine the load rate. The load rate is defined as the ratio of the actual load to the rated load. The load rate determination threshold is a. When the load rate > a, reduce the primary air volume and the grate adopts slow combustion operation; otherwise, do not adjust the primary air and grate. S6. Increase the primary air volume and the grate adopts combustion promotion operation; at the same time, determine whether the time since the last occurrence of CO moving average value > adjustment threshold is greater than the set adjustment effect protection time t1. If yes, maintain the increase effect of secondary air volume in S5. Otherwise, the secondary air exits the CO control state and returns to the O2 control state.

2. The combustion control method for a waste incinerator according to claim 1, characterized in that, Cumulative CO emissions during the S2 period The calculation method is as follows: , Where ti is the starting point of the control period for CO concentration detection by the continuous emission monitoring system, ti+t is the current time, the total duration of the control period is t0, and a control period cycle is completed when t=t0.

3. The combustion control method for a waste incinerator according to claim 1, characterized in that, The method for calculating the target value of O2 in S2 is as follows: , Where k is an adjustment factor, and its value ranges from 0 to k to 1; L CO This indicates the CO emission limit for a given period.

4. The combustion control method for a waste incinerator according to claim 3, characterized in that, The O2 setpoint for the high-efficiency combustion zone ranges from 4 to 6, while the O2 setpoint for the comfort combustion zone ranges from 6 to 9. The O2 setpoint for the comfort combustion zone is always greater than that for the high-efficiency combustion zone.

5. The combustion control method for a waste incinerator according to claim 3, characterized in that, Based on the influence of O2 concentration on CO concentration, the combustion process is divided into an incomplete combustion zone, a high-efficiency combustion zone, and a comfortable combustion zone, with the O2 concentration increasing sequentially within each zone. The average CO emission d corresponding to the O2 concentration at the boundary between the high-efficiency combustion zone and the incomplete combustion zone is also considered. CO Less than the CO emission limit L CO .

6. The combustion control method for a waste incinerator according to claim 1, characterized in that, In S2, the adjustment level p represents the fineness of O2 adjustment, with a value range of 0.3 to 0.8; the increase in secondary air ΔQ sec3 =f3(M, p)*load ratio, reduction in secondary air ΔQ sec4 =f4(M, p)*load ratio.

7. The combustion control method for a waste incinerator according to claim 1, characterized in that, In S3, the value of b ranges from 0.02 to 0.05, and the reduction in primary wind is ΔQ. pri6 =f6(M)*load ratio.

8. The combustion control method for a waste incinerator according to claim 1, characterized in that, In the calculation of the moving average of CO in S4, the time span of the moving average is 3~5s; the adjustment threshold is set to 200~600ppm.

9. The combustion control method for a waste incinerator according to claim 1, characterized in that, In step S5, the moving average CO concentration is divided into several levels from the adjustment threshold to the highest concentration. The level at which the current moving average CO concentration exceeds the adjustment threshold is defined as the CO exceedance intensity N, and the increase in secondary wind is ΔQ. sec1 =f1(N)*load rate; reduction in primary air volume ΔQ pri2 =f2(N)*load rate; the value of a ranges from 0.7 to 0.

8.

10. The combustion control method for a waste incinerator according to claim 1, characterized in that, In S6, t1 ranges from 20 to 60 seconds, and the increase in primary wind is ΔQ. pri5 =f5(M)*load ratio.

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