Waste incineration boiler control system capable of improving combustion stability

Abstract

The invention relates to the technical field of waste incineration treatment, in particular to a waste incineration boiler control system capable of improving combustion stability, and the system comprises a waste incineration data collection module which collects gas data and temperature data in the incineration process; the waste incineration data analysis and early warning module is used for carrying out incomplete combustion early warning by analyzing the content change trend of different flue gases in the combustion process; the waste incineration data early warning processing module is used for analyzing the waste combustion efficiency in the combustion process and the content of incomplete oxides in flue gas to obtain an air inlet amount adjusting coefficient; and the waste incineration air supply rate control module is used for controlling the air supply rate based on the air supply rate adjusting coefficient. The invention aims to improve the garbage combustion efficiency and combustion stability.

Description

Technical Field

[0001] This application relates to the technical field of waste incineration treatment, and specifically relates to a waste incineration boiler control system for improving combustion stability. Background Art

[0002] Waste incineration boilers incinerate high-calorie waste such as municipal waste and industrial waste at high temperatures. Most modern waste incineration boiler control systems use a combination of PLC (Programmable Logic Controller) and DCS (Distributed Control System) for automatic control. At the same time, carbon monoxide, nitrogen oxides, and other harmful gases are generated during the incineration process. Through technologies such as automatic control, data analysis, flue gas monitoring and treatment, the combustion stability and efficiency can be improved, and environmental pollution can be reduced.

[0003] Currently, the automatic control method for waste incinerators generally adjusts based on fixed combustion parameters. However, due to the complex composition of waste and the large changes in the combustion process, the fixed combustion parameters will lead to frequent imbalances between air and combustibles during the incineration process. If the combustion air volume (air volume) is insufficient, the concentration of oxygen in the furnace will be too low, resulting in incomplete oxidation of the fuel and incomplete combustion problems, reducing the combustion stability in the waste incineration boiler. Summary of the Invention

[0004] In view of the above, it is necessary to provide a waste incineration boiler control system for improving combustion stability to solve the above problems.

[0005] An embodiment of this application provides a waste incineration boiler control system for improving combustion stability, and the system includes: A waste incineration data acquisition module, used to obtain temperature data at each sampling moment and various gas concentration data generated by combustion; A waste incineration data analysis and early warning module, used to determine the incomplete combustion index at each sampling moment according to the concentration data of different gases at each sampling moment; compare the incomplete combustion indexes at different sampling moments and analyze their change trends to obtain the incomplete combustion early warning coefficient, give an early warning of incomplete combustion, and obtain the early warning moment; A waste incineration data early warning processing module, used to analyze the change characteristics of the temperature data at the early warning moment and all previous sampling moments, and compare with the temperature data of complete combustion in history to obtain the waste incineration efficiency at the early warning moment; according to the distribution characteristics of the incomplete combustion indexes at the early warning moment and all previous sampling moments, combined with the gas content at the early warning moment, obtain the flue gas content weight at the early warning moment; based on the waste incineration efficiency and the flue gas content weight, obtain the air intake adjustment coefficient at the early warning moment; The waste incineration air intake control module is used to control the air supply rate according to the air intake adjustment coefficient at the warning moment.

[0006] Among them, the specific steps for determining the incomplete combustion index at each sampling moment include: The gas concentration data includes the gas concentrations of oxygen, carbon monoxide, carbon dioxide, and sulfur dioxide. For each sampling moment, calculate the sum value between the carbon monoxide gas concentration and the sulfur dioxide gas concentration, and record the ratio between the sum value and the oxygen gas concentration as the first ratio; record the ratio between the carbon monoxide gas concentration and the carbon dioxide gas concentration as the second ratio; take the result of the positive fusion of the first ratio and the second ratio as the incomplete combustion index at each sampling moment.

[0007] Among them, the method for obtaining the incomplete combustion warning coefficient is specifically: Obtain the first-order difference sequence of the sequence composed of the incomplete combustion indices at the current sampling moment and all previous sampling moments, and calculate the sum value of the elements of the first-order difference sequence; calculate the difference between the incomplete combustion index at the current sampling moment and the average value of the incomplete combustion indices at all sampling moments during the historical complete combustion process, and perform positive fusion with the sum value of the elements to obtain the incomplete combustion warning coefficient at the current sampling moment.

[0008] Among them, the condition for warning incomplete combustion is that the normalized value of the complete combustion warning coefficient is greater than or equal to the preset threshold.

[0009] Among them, the specific process for obtaining the waste incineration efficiency at the warning moment is: Obtain all temperature data from the start of combustion to the warning moment, extract the slope of the temperature data at the warning moment, and record it as the first slope; obtain the moment with the same ordinal position as the warning moment during the historical complete combustion process, and record it as the reference moment, and record the slope of the temperature data corresponding to the reference moment as the second slope; record the ratio of the first slope to the second slope as the third ratio; record the ratio of the temperature data at the warning moment to the temperature data at the reference moment as the fourth ratio; take the product of the third ratio and the fourth ratio as the waste incineration efficiency at the warning moment.

[0010] Among them, the specific process for obtaining the flue gas content weight at the warning moment is: Obtain the minimum value of the incomplete combustion indices at the warning moment and all previous sampling moments; calculate the difference between the incomplete combustion index at the warning moment and the minimum value, and multiply it by the negative correlation mapping result of the oxygen gas content at the warning moment to obtain the flue gas content weight at the warning moment.

[0011] Among them, the oxygen gas content specifically refers to the proportion of the oxygen gas concentration.

[0012] Among them, the air intake adjustment coefficient at the warning moment is specifically the normalized result of the ratio of the flue gas content weight at the warning moment to the waste incineration efficiency.

[0013] Among them, the control of the air supply rate specifically has the following formula: ; in the formula, is the air supply rate at the warning moment; is the currently fixed air supply rate, is the air intake adjustment coefficient at the warning moment.

[0014] Among them, when the conditions for warning incomplete combustion are not met, the control of the air supply rate is stopped.

[0015] This application has at least the following beneficial effects: This application determines the incomplete combustion index at each sampling moment according to the concentration data of different gases at each sampling moment, analyzes the change trend of the content of different flue gases during the waste incineration process, and conducts an early warning of incomplete combustion, which helps to timely detect the problem of insufficient oxygen supply during the combustion process and give an early warning; further, analyzes the change characteristics of the temperature data at the warning moment and all previous sampling moments, and compares them with the temperature data of complete combustion in history to obtain the waste incineration efficiency at the warning moment, which can accurately evaluate the efficiency and state of the current incineration process; according to the distribution characteristics of the incomplete combustion index at the warning moment and all previous sampling moments, combined with the gas content at the warning moment, obtains the flue gas content weight at the warning moment; based on the waste incineration efficiency and the flue gas content weight, obtains the air intake adjustment coefficient at the warning moment, which helps to timely adjust the air intake when incomplete combustion is found, thereby optimizing the incineration process. By precisely controlling the air intake, the combustion efficiency can be improved, ensuring the full oxidation of the fuel during the waste incineration process, reducing the emission of harmful gases, and enhancing the operation stability and environmental protection performance of the overall incineration equipment. Description of the Drawings

[0016] Figure 1 is a block diagram of a waste incineration boiler control system for improving combustion stability provided by this application; Figure 2 is a specific flowchart for controlling the air supply rate provided by this application. Detailed Embodiments

[0017] In the description of the embodiments of the present application, words such as "exemplary", "or", "for example", etc. are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary", "or", "for example", etc. is intended to present related concepts in a specific manner.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0019] In addition, it should be noted that the terms "first" and "second" in this application and its drawings are used to distinguish similar objects and are not used to describe a specific order or sequence. For the method disclosed in the embodiments of this application or the method shown in the flowchart, including one or more steps for implementing the method, without departing from the scope of protection of this application, the execution order of multiple steps can be interchanged with each other, and some steps can also be deleted.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0021] The following specifically describes, with reference to the drawings, the specific solution of a waste incineration boiler control system for improving combustion stability provided by this application.

[0022] Please refer to Figure 1 , which shows a block diagram of a waste incineration boiler control system for improving combustion stability provided by an embodiment of this application. The system includes: a waste incineration data acquisition module, a waste incineration data analysis and early warning module, a waste incineration data early warning processing module, and a waste incineration air intake control module.

[0023] The embodiments of this application first propose a waste incineration boiler control system for improving combustion stability, which is applied to the technical field of waste incineration treatment. The system includes: Waste incineration data acquisition module: Obtain temperature data at each sampling moment and various gas concentration data generated by combustion.

[0024] The structural design of the waste incinerator is to achieve an efficient and environmentally friendly waste incineration process. Its main goal is to fully burn the waste and recover thermal energy while ensuring that the exhaust gas emissions meet environmental protection standards. A general waste incinerator mainly consists of a transfer device, an incineration device, a smoke exhaust device, a air supply device, and the corresponding control system. Based on the control system, the waste is sent into the incineration chamber through the transfer device, and air is input into the incineration chamber through the air supply device for incineration treatment. The flue gas generated by incineration is discharged or reused through the smoke exhaust device. Due to the possible imbalance between the combustibles and air during the incineration process, the problem of incomplete waste combustion may occur.

[0025] This application optimizes the problem of incomplete combustion by adjusting the combustion air intake. Since incomplete combustion will produce various carbon oxides and sulfur oxides, corresponding sensors are installed in the smoke exhaust device of the waste incinerator to monitor the real-time concentration values of different gases generated after combustion. In this embodiment, the collected gases include oxygen, carbon dioxide, carbon monoxide, and sulfur dioxide. At the same time, since the combustion temperature can more directly reflect the sufficiency of combustion, the real-time temperature value during the incineration process is obtained through the temperature sensor in the incineration chamber. In this embodiment, the gas concentration data and the temperature data are collected synchronously, and the sampling interval is set to 2 seconds. Based on the historical combustion data of this boiler, the indicators under complete combustion are obtained, which is convenient for subsequent adjustment of the air intake of the incinerator based on the change characteristics of the data to improve the stability of incineration.

[0026] Waste incineration data analysis and early warning module: Determine the incomplete combustion index at each sampling moment according to the concentration data of different gases at each sampling moment; Compare the incomplete combustion indexes at different sampling moments and analyze their change trends to obtain the incomplete combustion early warning coefficient and give an early warning of incomplete combustion.

[0027] Combustion is a chemical reaction that requires the participation of oxygen. Generally, in a waste incineration boiler, the combustibles react with oxygen to produce fully oxidized flue gas. If the oxygen supply in the boiler or burner is insufficient, the fuel cannot be completely burned, and there will be a situation of incomplete incineration, resulting in incompletely oxidized flue gas. Therefore, this application first gives an early warning of incomplete combustion based on the real-time concentration of different flue gases during the incineration process.

[0028] In the case of complete combustion of general waste, high concentrations of carbon dioxide and nitrogen oxides are generated, and the consumption of oxygen maintains a stable level compared to the input amount. When the oxygen content is insufficient to sustain waste combustion, incomplete combustion occurs, producing carbon monoxide and sulfur oxides, and the oxygen content gradually decreases. Therefore, different gas concentrations at each sampling moment during the incineration process can be obtained to measure the incomplete combustion index. Specifically: for each sampling moment, calculate the sum value between the carbon monoxide gas concentration and the sulfur dioxide gas concentration, and record the ratio between the sum value and the oxygen gas concentration as the first ratio; record the ratio between the carbon monoxide gas concentration and the carbon dioxide gas concentration as the second ratio; the result of positively fusing the first ratio and the second ratio is used as the incomplete combustion index for each sampling moment. In this embodiment, the method of multiplying is used for positive fusion of multiple variables.

[0029] It should be understood that the first ratio represents the gas concentration ratio of carbon monoxide and sulfur dioxide in the incomplete combustion products. The larger the value, the more incomplete the incineration, and the larger the incomplete combustion index; the second ratio represents the difference between different carbon oxides. Since carbon monoxide is a marker gas produced during incomplete combustion, the larger the gas concentration, the larger the second ratio, and the larger the incomplete combustion index at the corresponding moment.

[0030] During the waste incineration process, in order to avoid incomplete combustion, it is necessary to increase the air input at the corresponding moment. However, it is not necessary to immediately increase the air input when the incomplete combustion index at a certain moment increases. Since the air input rate is fixed, the consumption of oxygen gradually increases in the case of insufficient combustion. Then, when the oxygen concentration shows a downward trend over a period of time and the gas concentration generated due to incomplete combustion shows an upward trend, that is, when the incomplete combustion index decreases over a period of time, it can be considered that there is a problem of incomplete combustion during the waste incineration process. Based on this, compare the incomplete combustion indices at different sampling moments and analyze their change trends to give an early warning of incomplete combustion. Specifically: obtain the first-order difference sequence of the sequence composed of the incomplete combustion indices at the current sampling moment and all previous sampling moments, and calculate the sum value of the elements of the first-order difference sequence; calculate the difference between the incomplete combustion index at the current sampling moment and the average value of the incomplete combustion indices at all sampling moments during the historical complete combustion process, and positively fuse it with the sum value of the elements to obtain the incomplete combustion early warning coefficient at the current sampling moment; when the normalized value of the incomplete combustion early warning coefficient is greater than or equal to the preset threshold, an incomplete combustion early warning is issued. In this embodiment, the difference between variables is calculated by taking the difference; the method of multiplying is used for positive fusion of multiple variables; the normalization method used is the maximum-minimum normalization method; the preset threshold value is 0.85.

[0031] It should be understood that the elements and values represent the changing trend of the incomplete combustion index at the current sampling moment and all previous sampling moments. The larger the value, the more obvious the phenomenon of incomplete combustion as the incineration progresses, indicating that the phenomenon of incomplete combustion is more obvious. At the same time, the greater the difference between the current sampling moment and the average value of the incomplete combustion index during complete combustion, the more incomplete the combustion in the furnace, and the greater the incomplete combustion warning coefficient.

[0032] Waste incineration data warning processing module: Analyze the changing characteristics of the temperature data at the warning moment and all previous sampling moments, and compare it with the temperature data of historical complete combustion to obtain the waste incineration efficiency at the warning moment. According to the distribution characteristics of the incomplete combustion index at the warning moment and all previous sampling moments, combined with the gas content at the warning moment, obtain the flue gas content weight at the warning moment. Based on the waste incineration efficiency and the flue gas content weight, obtain the air intake adjustment coefficient at the warning moment.

[0033] Mark the moment when an incomplete combustion warning is issued during the incineration process as the warning moment. To solve the problem of incomplete combustion caused by the imbalance between oxygen and combustibles, this application adjusts the air intake to ensure the complete combustion of waste and improve combustion stability.

[0034] First, determine the waste incineration efficiency at the warning moment. The waste incineration efficiency is an index to measure the degree of thermal energy conversion during the combustion process. Therefore, the size of the combustion temperature can measure the waste incineration efficiency at the corresponding moment. If the waste fails to burn completely, then the temperature from the start of combustion to the warning moment will be lower than the case of complete combustion, that is, the greater the temperature difference, the lower the efficiency of the waste incineration process. Obtain all temperature data from the start of combustion to the warning moment, extract the slope of the temperature data at the warning moment, and denote it as the first slope. Obtain the moment with the same sequence number as the warning moment during the historical complete combustion process, denote it as the reference moment, and denote the slope of the temperature data corresponding to the reference moment as the second slope. Denote the ratio of the first slope to the second slope as the third ratio. Denote the ratio of the temperature data at the warning moment to the temperature data at the reference moment as the fourth ratio. Take the product of the third ratio and the fourth ratio as the waste incineration efficiency at the warning moment.

[0035] It should be understood that the third ratio represents the slope difference of the real-time temperature data in two cases at the warning moment. The greater this difference, that is, the smaller the third ratio, the greater the trend difference of the real-time temperature data at the corresponding moments of the same sequence number, that is, the lower the incineration efficiency of this incineration. The fourth ratio represents the temperature accumulation difference of the real-time temperature data at the corresponding moments of the same sequence number. If this difference is smaller, it means that the temperature accumulation is closer to the temperature data at the reference moment, and the incineration efficiency is higher.

[0036] For the warning moment, if the waste incineration efficiency is lower, it indicates a higher degree of incomplete combustion of the waste during incineration. Then, a larger air intake is required to balance the combustion process. On the contrary, a higher degree of complete combustion of the waste means a relatively smaller air intake is needed.

[0037] Although temperature can directly reflect the incineration efficiency and determine whether combustion is complete, it cannot fully reveal whether the combustion process has achieved the ideal chemical conversion effect and is difficult to adapt to the changes of different combustibles. Therefore, it is necessary to combine the gas components generated during the combustion process to more accurately adjust the air intake. Specifically: obtain the minimum value of the incomplete combustion index at the warning moment and all previous sampling moments; calculate the difference between the incomplete combustion index at the warning moment and the minimum value, and multiply it by the negative correlation mapping result of the oxygen gas content at the warning moment to obtain the flue gas content weight at the warning moment. In this embodiment, the difference between variables is calculated using subtraction; the negative correlation mapping result of the oxygen gas content is specifically the reciprocal of the oxygen gas content; where the oxygen gas content is specifically the proportion of the oxygen gas concentration. It should be noted that in order to avoid the obtained oxygen weight being 0, a preset parameter with a value of 0.01 needs to be added to the numerator. Further, in order to avoid the flue gas content weight being meaningless due to the oxygen gas content being 0, a preset parameter is also added to the denominator.

[0038] It should be understood that the difference between the incomplete combustion index at the warning moment and the minimum value represents the proportion of incomplete oxides in the discharged flue gas. Since the incomplete combustion index of the waste reflects to a certain extent the content of incomplete oxides in the flue gas, the larger its value, the more incomplete oxides are contained in the gas discharged at the warning moment. Combining the oxygen content in the incinerator, if the oxygen gas content is smaller, it indicates that the oxygen consumption at this moment is larger, and the corresponding flue gas content weight value is larger.

[0039] If the boiler waste incineration efficiency at the warning moment is lower and the flue gas content weight is higher, it indicates that the incomplete combustion of the waste in the incinerator at this moment is more serious, and then more air intake is required to balance the combustion of the combustibles. On the contrary, the demand is smaller; based on this, the normalized result of the ratio of the flue gas content weight at the warning moment to the waste incineration efficiency is used as the air intake adjustment coefficient at the warning moment. The normalization method adopted in this application is the logarithmic normalization method, so that the value of the air intake adjustment coefficient is in the range of [0,1].

[0040] It should be understood that if the value of the air intake adjustment coefficient is larger, it indicates a greater imbalance between oxygen and the combustibles, and the demand for oxygen is greater; on the contrary, it indicates that the demand for oxygen is relatively small.

[0041] Waste incineration air intake control module: Control the air supply rate according to the air intake adjustment coefficient at the warning moment.

[0042] Since the current automatic control of the waste incinerator delivers air to the incinerator at a fixed recent rate, and the warning generated by the imbalance between oxygen and combustibles mentioned above makes this fixed rate unable to meet the combustion requirements and stability, it is necessary to adjust the fixed air supply rate at the warning moment based on the air intake adjustment coefficient, as follows: ; In the formula, is the air supply rate at the warning moment; is the current fixed air supply rate, is the air intake adjustment coefficient at the warning moment. That is, taking as the weight, if the air intake adjustment coefficient is larger, then the incinerator has a greater demand for air volume and requires a larger air supply rate, and the value will be larger.

[0043] Control the air intake at the warning moment to ensure the full combustion of combustibles as much as possible. Subsequently, as the air intake increases, stop adjusting the air supply rate until the warning condition is not met, and then continue to monitor to determine the next warning moment and adjust in real time.

[0044] Through the obtained real-time air supply rate above, then automatically input this air supply rate adjustment instruction into the control system of the boiler. By adjusting the fan speed or the size of the air supply port of the air supply device through the control system, and at the same time by dynamically adjusting the air supply rate, the system can accurately control the oxygen supply, fuel flow, etc. according to the actual combustion state, so as to achieve the best combustion effect and the optimal boiler operation state, and further improve the combustion stability.

[0045] Among them, the specific flow chart for controlling the air supply rate is as shown in Figure 2 the figure.

[0046] In summary, according to the concentration data of different gases at each sampling moment, the embodiment of the present application determines the incomplete combustion index at each sampling moment, analyzes the change trend of the content of different flue gases during the waste incineration process, and conducts incomplete combustion early warning, which helps to timely discover the problem of insufficient oxygen supply during the combustion process and issue an early warning in a timely manner. Further, by analyzing the change characteristics of the temperature data at the early warning moment and all previous sampling moments and comparing them with the temperature data of complete combustion in history, the waste incineration efficiency at the early warning moment can be obtained, and the efficiency and state of the current incineration process can be accurately evaluated. According to the distribution characteristics of the incomplete combustion index at the early warning moment and all previous sampling moments, combined with the gas content at the early warning moment, the flue gas content weight at the early warning moment is obtained. Based on the waste incineration efficiency and the flue gas content weight, the air intake adjustment coefficient at the early warning moment is obtained, which helps to timely adjust the air intake when incomplete combustion is found, thereby optimizing the incineration process. By precisely controlling the air intake, the combustion efficiency can be improved, the fuel in the waste incineration process can be fully oxidized, harmful gas emissions can be reduced, and the operation stability and environmental protection performance of the overall incineration equipment can be enhanced.

[0047] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the descriptions. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. Each block in the block diagram and / or flowchart, as well as combinations of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0048] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. A waste incineration boiler control system for improving combustion stability, characterized in that, The system includes: A waste incineration data collection module, which is used to obtain temperature data at each sampling moment and various gas concentration data generated by combustion; A waste incineration data analysis and early warning module, which is used to determine the incomplete combustion index at each sampling moment according to the concentration data of different gases at each sampling moment; compare the incomplete combustion indexes at different sampling moments and analyze their change trends to obtain the incomplete combustion early warning coefficient, give an early warning of incomplete combustion, and obtain the early warning moment; A waste incineration data early warning processing module, which is used to analyze the change characteristics of temperature data at the early warning moment and all previous sampling moments, and compare them with the temperature data of complete combustion in history to obtain the waste incineration efficiency at the early warning moment; according to the distribution characteristics of the incomplete combustion indexes at the early warning moment and all previous sampling moments, combined with the gas content at the early warning moment, obtain the flue gas content weight at the early warning moment; based on the waste incineration efficiency and the flue gas content weight, obtain the air intake adjustment coefficient at the early warning moment; A waste incineration air intake control module, which is used to control the air supply rate according to the air intake adjustment coefficient at the early warning moment.

2. The waste incineration boiler control system for improving combustion stability according to claim 1, characterized in that, The specific steps for determining the incomplete combustion index at each sampling moment include: The gas concentration data includes the gas concentrations of oxygen, carbon monoxide, carbon dioxide, and sulfur dioxide. For each sampling moment, calculate the sum value between the carbon monoxide gas concentration and the sulfur dioxide gas concentration, and record the ratio between the sum value and the oxygen gas concentration as the first ratio; record the ratio between the carbon monoxide gas concentration and the carbon dioxide gas concentration as the second ratio; use the result of positive fusion of the first ratio and the second ratio as the incomplete combustion index at each sampling moment.

3. A waste incineration boiler control system for improving combustion stability as described in claim 1, characterized in that, The specific method for obtaining the incomplete combustion early warning coefficient is: Obtain the first-order difference sequence of the sequence composed of the incomplete combustion indexes at the current sampling moment and all previous sampling moments, and calculate the sum value of the elements of the first-order difference sequence; calculate the difference between the incomplete combustion index at the current sampling moment and the average value of the incomplete combustion indexes at all sampling moments during the historical complete combustion process, and perform positive fusion with the sum value of the elements to obtain the incomplete combustion early warning coefficient at the current sampling moment.

4. A waste incineration boiler control system for improving combustion stability according to claim 1, characterized in that, The condition for giving an early warning of incomplete combustion is that the normalized value of the complete combustion early warning coefficient is greater than or equal to the preset threshold.

5. A waste incineration boiler control system for improving combustion stability according to claim 1, characterized in that, The specific process for obtaining the waste incineration efficiency at the early warning moment is: Obtain all temperature data from the start of combustion to the early warning moment, extract the slope of the temperature data at the early warning moment, and record it as the first slope; obtain the moment with the same ordinal position as the early warning moment during the historical complete combustion process, and record it as the reference moment, and record the slope corresponding to the temperature data at the reference moment as the second slope; record the ratio of the first slope to the second slope as the third ratio; record the ratio of the temperature data at the early warning moment to the temperature data at the reference moment as the fourth ratio; use the product of the third ratio and the fourth ratio as the waste incineration efficiency at the early warning moment.

6. The waste incineration boiler control system for improving combustion stability according to claim 2, characterized in that, The specific process for obtaining the flue gas content weight at the early warning moment is: Obtain the minimum value of the incomplete combustion index at the warning moment and all previous sampling moments; calculate the difference between the incomplete combustion index at the warning moment and the minimum value, and multiply it by the negatively correlated mapping result of the oxygen gas content at the warning moment to obtain the flue gas content weight at the warning moment.

7. The garbage incineration boiler control system for improving combustion stability according to claim 6, characterized in that, The oxygen gas content specifically refers to the proportion of the oxygen gas concentration.

8. A waste incineration boiler control system for improving combustion stability according to claim 1, characterized in that, The air intake adjustment coefficient at the warning moment is specifically the normalized result of the ratio of the flue gas content weight at the warning moment to the waste incineration efficiency.

9. The waste incineration boiler control system for improving combustion stability according to claim 1, characterized in that, The control of the air supply rate is specifically calculated by the following formula: ; where is the air supply rate at the warning moment; is the currently fixed air supply rate, is the air intake adjustment coefficient at the warning moment.

10. A waste incineration boiler control system for improving combustion stability according to claim 4, characterized in that When the conditions for warning against incomplete combustion are not met, stop controlling the air supply rate.

Images