A coke oven leakage judgment method based on a flue gas purification process configuration

Abstract

The present application provides a coke oven channeling and leakage judgment method based on characteristic flue gas components of a flue gas purification system. The method detects the characteristic flue gas components at the inlet or outlet of the flue gas purification system matched with the coke oven, determines the coke oven channeling and leakage state by using an algorithm model, continuously corrects and trains the algorithm model, more effectively determines the coke oven channeling and leakage, and can output whether the heating gas leaks into the flue gas system or the raw coal gas leaks into the flue gas system due to the oven body channeling and leakage, and the possible oven body channeling and leakage point. The method is helpful for timely and effective solution of the heating gas leakage into the flue gas system, avoids the loss of heating gas, is helpful for targeted treatment according to the coke oven body channeling and leakage degree and channeling and leakage point, prevents the further expansion of the oven wall cracks, and achieves the purposes of prolonging the oven wall life, reducing the environmental pollution caused by the raw coal gas combustion, and improving the chemical production recovery rate.

Description

Technical Field

[0001] This invention relates to coking production technology, and more particularly to a method for judging coke oven leakage based on the configuration of flue gas purification process. Background Technology

[0002] Coke ovens are industrial kilns constructed from refractory bricks and refractory mortar. The oven is heated to its operating temperature and then cooled down to shut down. The lifespan of a generation of coke ovens often exceeds 25 years. Under the current background of implementing ultra-low emission standards in the coking industry, the tightness of the refractory masonry of coke ovens determines the length of a generation of coke oven lifespan.

[0003] During daily coke oven production, repeated coke pushing operations cause temperature changes, mechanical stress, and chemical corrosion, leading to a gradual increase in coke oven leakage. During the high-temperature dry distillation of coking coal in the coke oven's carbonization chamber, free carbon accumulates in the furnace walls and riser pipes, forming graphite. Excessive graphite buildup can cause difficulties in pushing coke, difficulty in removing raw gas, and perforation of the furnace walls. The conventional method of introducing air to burn off the graphite is ineffective because uneven graphite accumulation can also burn off the protective graphite in the furnace body. This results in leakage through the brick joints of the carbonization chamber walls, especially at the top bricks, causing raw gas to leak from the positive-pressure carbonization chamber into the negative-pressure exhaust gas system. Coke oven leakage occurs in areas such as the exhaust gas pan, horizontal flue, regenerator, and inclined flue, where heating gas leaks from the rising airflow into the descending airflow.

[0004] During the coke oven production process, it is necessary to promptly detect the deterioration of the refractory masonry and carry out timely repairs. Failure to take timely and appropriate measures will not only seriously affect the achievement of ultra-low emissions from the coke oven, but will also greatly affect the lifespan of the coke oven and impact normal and safe production.

[0005] Leakage in the refractory masonry of the coke oven allows raw coal gas to leak into the combustion chamber and burn, causing localized temperature increases inside the oven. Changes in thermal stress lead to erosion of the coke oven walls, further exacerbating the deterioration of the refractory masonry. Even after installing a coke oven flue gas desulfurization and denitrification purification system, incomplete combustion of raw coal gas entering the waste gas system also makes flue gas desulfurization difficult, increases system resistance, and can even lead to low flue gas suction, making production organization such as coke oven heating difficult.

[0006] Coke oven leakage can also cause heating gas to leak into the downdraft, posing significant safety and environmental risks and leading to low coke oven thermal efficiency. For example, if the waste gas pan is not properly closed, heating gas can leak directly into the waste gas system, causing poor local heating and wasted gas; heating gas leaking into the downdraft through the horizontal flue can burn in the horizontal flue, increasing the waste gas temperature and reducing coke oven thermal efficiency; leaked heating gas during heating exchange can easily reach the explosion limit and explode in the horizontal flue; heating gas leaking into the downdraft in areas such as inclined flues and regenerators can cause combustion in those areas, resulting in localized high temperatures that melt and deform the refractory masonry, causing damage.

[0007] The above problems seriously jeopardize the lifespan of coke ovens. Leakage is particularly severe in the later stages of oven service and after prolonged periods of no-fire operation, such as during partial oven repairs. Once a coke oven leak occurs, it must be detected and assessed promptly, and targeted measures must be taken to ensure the longevity of the coke oven, reduce the desulfurization load on the flue gas purification system, prevent hydrocarbons from incomplete combustion of raw coal gas from clogging the desulfurization and denitrification systems, and ensure normal and safe production.

[0008] In the past, on-site coke oven operators mainly relied on visual observation, simply judging coke oven leaks by observing the black smoke coming out of the coke oven chimney. They relied on experience combined with on-site production conditions to further check the vertical and horizontal flues to determine and deal with the leak points.

[0009] After the implementation of standards such as the "Emission Standard for Chemical Pollutants from Coking" and "Ultra-Low Emissions for Iron and Steel Enterprises", coke ovens have been generally equipped with coke oven flue gas purification devices. The flue gas is purified and then discharged from the original chimney. Even if a coke oven leak occurs, it is difficult for the chimney to emit black smoke. As a result, the original method can no longer be used to determine whether a coke oven is leaking in a timely manner, which is not conducive to the timely detection and repair of coke oven leaks. Summary of the Invention

[0010] The purpose of this invention is to provide a method for judging coke oven leakage based on the configuration of flue gas purification process, so as to improve the timeliness and effectiveness of the judgment process.

[0011] The technical solution adopted by this invention to solve its technical problem is as follows:

[0012] A method for judging coke oven leakage based on characteristic flue gas components of a flue gas purification system, comprising:

[0013] Under normal coke oven production conditions, data on characteristic flue gas components in the flue gas purification system are collected to obtain the concentration threshold range of characteristic flue gas components in the flue gas purification system under normal production conditions. Multiple heating system exchange cycles are continuously collected to form a standard curve of periodic changes in characteristic flue gas components.

[0014] Real-time data collection of characteristic flue gas components in the flue gas purification system is performed while the coke oven is in a pre-test production state.

[0015] The characteristic flue gas component data of the flue gas purification system under the coke oven production state to be tested are compared with the data of the corresponding time point of the periodic change standard curve. When the comparison result is greater than the threshold range, the leakage state is judged in combination with the coke oven production process at this time, and the cause of leakage is distinguished.

[0016] The threshold range of characteristic flue gas components refers to the threshold range at different points in time within a set of coke oven heating system exchange cycles. These are unique to each coke oven, and different coke ovens have different threshold ranges for characteristic flue gas components. To obtain the concentration threshold range of characteristic flue gas, data is collected every minute. Using the time of each heating system exchange cycle as the x-axis, the characteristic flue gas component data from different heating system exchange cycles are overlaid to generate a scatter plot, thus obtaining the threshold range of characteristic flue gas components for that coke oven at different points in time within the heating system exchange cycle. After the coke oven heating system exchange cycle is adjusted, the threshold range of characteristic flue gas components should be re-collected and regenerated. Because the airtightness of coke ovens varies with their age, the threshold range of characteristic flue gas components should be regenerated periodically.

[0017] When forming a standard curve for the periodic variation of characteristic flue gas components, the standard curve includes two adjacent heating states, one of which is combustion in odd-numbered flues and the other is combustion in even-numbered flues. First, abnormal data of characteristic flue gas components during the heating exchange period of the flue gas purification system are removed. Then, the characteristic flue gas component data covering both odd-numbered and even-numbered flue combustion are summarized and regression analysis is performed to form a curve fit on the time series, thereby completing the establishment of the standard curve for periodic variation.

[0018] Real-time data acquisition of characteristic flue gas components is performed using a flue gas component detection unit. This unit is installed at the inlet or outlet of the flue gas purification system to perform online detection of characteristic flue gas component data, sending the detection data to a computing terminal for storage. Installing the flue gas component detection unit at the inlet of the flue gas purification system minimizes interference from flue gas purification on the characteristic flue gas components, providing more accurate data to the coke oven leakage algorithm model and enabling more effective detection of coke oven leakage.

[0019] When collecting real-time data on characteristic flue gas components, data are collected on the components of CO and CH4, or on the components of CO and non-methane total hydrocarbons.

[0020] When determining the leakage status, the calculation terminal uses the concentration threshold range of characteristic flue gas components of the flue gas purification system under normal production conditions, the periodic alternating heating law of the double flue of the coke oven heating system, and the pressure change characteristics during coal charging and dry distillation in the carbonization chamber to verify and analyze whether the online flue gas component trend is abnormal, and the relationship between the abnormal flue gas component trend and the coke oven heating system and coke oven pushing and coal charging operations, to determine whether there is a leakage problem in the coke oven.

[0021] The periodic alternating heating pattern of the dual-channel heating system refers to the fact that the coke oven heating system is a dual-channel system. When the odd-numbered channels are burning with rising airflow, the adjacent even-numbered channels are burning with descending airflow to discharge waste gas. The heating and exchange occur at fixed intervals. The even-numbered channels become burning with rising airflow, and the adjacent odd-numbered channels become burning with descending airflow to discharge waste gas. The cycle from combustion in the odd-numbered channels to combustion in the even-numbered channels is one heating system exchange cycle.

[0022] The pressure change characteristics during coal charging and carbonization in the carbonization chamber refer to the periodic changes in pressure within the chamber during one cycle from coal feeding to coke maturation and subsequent pushing. This can be measured by installing pressure-conducting pipes at the furnace door, top coal feeding port, riser pipe, and bridge pipe. These pressure change characteristics show that the pressure in the carbonization chamber is relatively high during the coal feeding process and initially, decreasing after two-thirds of the cycle time.

[0023] When determining whether a coke oven has a leakage problem, it can be determined directly by checking whether the concentration of characteristic flue gas components exceeds a threshold range, or by using a moving average calculation method to accurately determine the concentration of characteristic flue gas components. In implementation, a pre-defined operator is embedded into the system and automatically executed at fixed intervals, the fixed intervals being determined by the coke oven heating exchanger.

[0024] When determining whether there is a leakage problem in the coke oven:

[0025] After the gas heating system of the coke oven exchanges gas every half hour, the CO concentration surges, indicating that the exchange tube is not in place, causing the heated gas to leak into the flue gas purification system before reaching the combustion chamber; this determination allows for the rapid location of the misplaced exchange tube and the implementation of repositioning measures.

[0026] A surge in CH4 content or non-methane total hydrocarbon concentration indicates that coke oven gas has leaked into the flue gas purification system.

[0027] During the coking process, the CH4 concentration surged, and the CO concentration also increased, indicating that raw coal gas had leaked into the flue gas purification system.

[0028] During the coal charging process, the CH4 concentration surged, and the CO concentration increased at the same time. Since the coal charging operations of different coke oven carbonization chambers were carried out according to the production plan, it was determined at this time that leakage occurred in the furnace wall of the coke oven carbonization chamber during the coal charging operation.

[0029] During heating with manufactured gas, the concentrations of CH4 and CO increased, indicating that manufactured gas had leaked into the flue gas purification system. During heating with blast furnace gas, the CO concentration increased, but the CH4 concentration did not change significantly, indicating that blast furnace gas had leaked into the flue gas purification system.

[0030] The principle of this judgment method is that individual components in the coke oven heating flue gas are linearly correlated with the coke oven heating exchange process, especially CO, CH₄ (or non-methane total hydrocarbons) in the flue gas, which either directly come from the incomplete combustion of coal charging gas that leaks into the waste gas system, or directly come from the incomplete combustion of raw gas that leaks into the waste gas system under the positive pressure state of the carbonization chamber when the refractory masonry of the coke oven is not tight. In the initial coal charging stage, the furnace pressure of the carbonization chamber is high, and the raw gas is more likely to leak when the furnace wall is not sealed. Based on the above characteristics, an algorithm model that is continuously corrected and trained is established to generate the threshold range of characteristic flue gas. By comparing the single value or moving average of the flue gas component concentration, the leakage degree of the coke oven is judged, and it is output whether the heating gas leaks into the flue gas system, or the raw gas leaks into the flue gas system due to the leakage of the oven body, as well as the possible leakage point of the oven body.

[0031] The advantages of the present invention are as follows:

[0032] This method detects the characteristic flue gas components at the inlet or outlet of the flue gas purification system matched with the coke oven, and uses the algorithm model to determine the leakage state of the coke oven. The algorithm model can be continuously corrected and trained to more effectively determine the leakage of the coke oven. It can output whether the heating gas leaks into the flue gas system, or the raw gas leaks into the flue gas system due to the leakage of the oven body, as well as the possible leakage point of the oven body, which is helpful for the timely and effective solution of the heating gas leakage into the flue gas system, avoiding the loss of heating gas, and facilitating targeted treatment according to the leakage degree and leakage point of the coke oven body, preventing the furnace wall cracks from further expanding, so as to achieve the purposes of prolonging the service life of the furnace wall, reducing the environmental pollution caused by the combustion of raw gas, and improving the chemical product recovery rate. This method analyzes and judges in real time whether the coke oven has leakage through the online data algorithm model, which has better timeliness and effectiveness of the judgment method. The selected characteristic flue gases are all flue gas component changes directly caused by the coke oven leakage, which can be distinguished from the flue gas component changes generated by the normal heating of the coke oven. Combined with the pressure change of the carbonization chamber during the coke pushing and coal charging process of the coke oven, the leakage situation of the coke oven can be judged more directly. Linked with the coke oven heating control system and the coke oven pushing and coal charging operation management system, it can assist in quickly judging the leakage of the coke oven heating system. Brief Description of the Drawings

[0033] Figure 1 is a schematic diagram of the coke oven leakage judgment system proposed by the present invention;

[0034] Figure 2 is the CH₄ concentration change curve in the flue gas obtained by online monitoring of flue gas components;

[0035] Figure 3 is the CO concentration change curve in the flue gas obtained by online monitoring of flue gas components. Detailed Description of the Embodiments

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] like Figure 1 As shown, the coke oven leakage judgment method based on the characteristic flue gas components of the flue gas purification system proposed in this invention includes:

[0038] Under normal coke oven production conditions, data on characteristic flue gas components in the flue gas purification system are collected to obtain the concentration threshold range of characteristic flue gas components in the flue gas purification system under normal production conditions. Multiple heating system exchange cycles are continuously collected to form a standard curve of periodic changes in characteristic flue gas components.

[0039] Real-time data collection of characteristic flue gas components in the flue gas purification system is performed while the coke oven is in a pre-test production state.

[0040] The characteristic flue gas component data of the flue gas purification system under the coke oven production state to be tested are compared with the data of the corresponding time point of the periodic change standard curve. When the comparison result is greater than the threshold range, the leakage state is judged in combination with the coke oven production process at this time, and the cause of leakage is distinguished.

[0041] The threshold range of characteristic flue gas components is a range of threshold values ​​at different points in time within a set of coke oven heating system exchange cycles. These are unique to each coke oven, and different coke ovens have different threshold ranges for characteristic flue gas components. To obtain the concentration threshold range of characteristic flue gas, data is collected every minute. Using the time of each heating system exchange cycle as the x-axis, the characteristic flue gas component data from different heating system exchange cycles are overlaid to generate a scatter plot, thus obtaining the threshold range of characteristic flue gas components for that coke oven at different points in time within the heating system exchange cycle. After the coke oven heating system exchange cycle is adjusted, the threshold range of characteristic flue gas components should be re-collected and regenerated. Because the airtightness of coke ovens varies with their age, the threshold range of characteristic flue gas components should be regenerated periodically. When determining the threshold range, the maximum and minimum values ​​can be identified as the flue gas component concentration threshold range, or the mean and standard deviation of the sample data can be calculated. The monitoring data x is then judged for abnormality using the following formula:

[0042] |x-μ| / σ>3.

[0043] When forming a standard curve for the periodic variation of characteristic flue gas components, the standard curve includes two adjacent heating states, one of which is combustion in odd-numbered flues and the other is combustion in even-numbered flues. First, abnormal data of characteristic flue gas components during the heating exchange period of the flue gas purification system are removed. Then, the characteristic flue gas component data covering both odd-numbered and even-numbered flue combustion are summarized and regression analysis is performed to form a curve fit on the time series, thereby completing the establishment of the standard curve for periodic variation.

[0044] Real-time data acquisition of characteristic flue gas components is performed using a flue gas component detection unit. This unit is installed at the inlet or outlet of the flue gas purification system to perform online detection of characteristic flue gas component data, sending the detection data to a computing terminal for storage. Installing the flue gas component detection unit at the inlet of the flue gas purification system minimizes interference from flue gas purification on the characteristic flue gas components, providing more accurate data to the coke oven leakage algorithm model and enabling more effective detection of coke oven leakage.

[0045] When collecting real-time data on characteristic flue gas components, data are collected on the components of CO and CH4, or on the components of CO and non-methane total hydrocarbons.

[0046] When determining the leakage status, the calculation terminal uses the concentration threshold range of characteristic flue gas components of the flue gas purification system under normal production conditions, the periodic alternating heating law of the double flue of the coke oven heating system, and the pressure change characteristics during coal charging and dry distillation in the carbonization chamber to verify and analyze whether the online flue gas component trend is abnormal, and the relationship between the abnormal flue gas component trend and the coke oven heating system and coke oven pushing and coal charging operations, to determine whether there is a leakage problem in the coke oven.

[0047] The periodic alternating heating pattern of the dual-channel heating system refers to the fact that the coke oven heating system is a dual-channel system. When the odd-numbered channels are burning with rising airflow, the adjacent even-numbered channels are burning with descending airflow to discharge waste gas. The heating and exchange occur at fixed intervals. The even-numbered channels become burning with rising airflow, and the adjacent odd-numbered channels become burning with descending airflow to discharge waste gas. The cycle from combustion in the odd-numbered channels to combustion in the even-numbered channels is one heating system exchange cycle.

[0048] The pressure change characteristics during coal charging and carbonization in the carbonization chamber refer to the periodic changes in pressure within the chamber during one cycle from coal feeding to coke maturation and subsequent pushing. This can be measured by installing pressure-conducting pipes at the furnace door, top coal feeding port, riser pipe, and bridge pipe. These pressure change characteristics show that the pressure in the carbonization chamber is relatively high during the coal feeding process and initially, decreasing after two-thirds of the cycle time.

[0049] When determining whether a coke oven has a leakage problem, it can be determined directly by checking whether the concentration of characteristic flue gas components exceeds a threshold range, or by using a moving average calculation method to accurately determine the concentration of characteristic flue gas components. In implementation, a pre-defined operator is embedded into the system and automatically executed at fixed intervals, the fixed intervals being determined by the coke oven heating exchanger.

[0050] When determining whether there is a leakage problem in the coke oven:

[0051] After the gas heating system of the coke oven exchanges gas every half hour, the CO concentration surges, indicating that the exchange tube is not in place, causing the heated gas to leak into the flue gas purification system before reaching the combustion chamber; this determination allows for the rapid location of the misplaced exchange tube and the implementation of repositioning measures.

[0052] A surge in CH4 content or non-methane total hydrocarbon concentration indicates that coke oven gas has leaked into the flue gas purification system.

[0053] During the coking process, the CH4 concentration surged, and the CO concentration also increased, indicating that raw coal gas had leaked into the flue gas purification system.

[0054] During the coal charging process, the CH4 concentration surged, and the CO concentration increased at the same time. Since the coal charging operations of different coke oven carbonization chambers were carried out according to the production plan, it was determined at this time that leakage occurred in the furnace wall of the coke oven carbonization chamber during the coal charging operation.

[0055] During heating with manufactured gas, the concentrations of CH4 and CO increased, indicating that manufactured gas had leaked into the flue gas purification system. During heating with blast furnace gas, the CO concentration increased, but the CH4 concentration did not change significantly, indicating that blast furnace gas had leaked into the flue gas purification system.

[0056] like Figure 2 , Figure 3 The values ​​represent the changes in CH4 and CO concentrations in flue gas obtained from online monitoring of flue gas components. These values ​​are data within a complete exchange cycle (1 hour, with exchanges every half hour, covering the combustion states of odd-numbered and even-numbered flues).

[0057] Case 1: Figure 1 Point ① of the 5B furnace: When coal was being charged in a certain carbonization chamber of the 5B coke oven, there was a leak in the furnace body, and raw coal gas leaked into the flue gas system. After the inspection hole cover was opened on site, the flue gas composition returned to normal.

[0058] Case 2: Figure 1 Point ② of the 6B furnace was in the combustion state of this direction. After the exchange, a jamming phenomenon occurred. Since the coke oven heating uses MG heating, the CO concentration and CH4 concentration in the flue gas both increased. After the jamming was dealt with on-site, the flue gas composition returned to normal.

[0059] Case 3: Figure 1Point ③ of the 6B furnace: When coal was being charged into a certain carbonization chamber of the 6B coke oven, there was a leak in the furnace body, and raw coal gas leaked into the flue gas system. After the inspection hole cover was opened on site, the flue gas composition returned to normal.

[0060] Case 4: Figure 2 Point ④ of the 1A furnace is the 1A coke oven in this combustion state. After the exchange, a jamming phenomenon occurred. Because the coke oven is heated by BFG, the CO concentration in the flue gas increased. After the jamming was dealt with on-site, the flue gas composition returned to normal.

[0061] In the description of this invention, it should be noted that when terms such as "upper," "lower," "inner," "outer," "left," and "right" appear to indicate orientation or positional relationships, they should be understood as being based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product of this invention is in use, or the orientation or positional relationships commonly understood by those skilled in the art. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, when terms such as "first" and "second" appear, they are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, it should also be noted that unless otherwise explicitly specified and limited, terms such as "installation," "setting," and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A method for judging coke oven leakage based on characteristic flue gas components of a flue gas purification system, characterized in that, include: Under normal coke oven production conditions, data on characteristic flue gas components in the flue gas purification system are collected to obtain the concentration threshold range of characteristic flue gas components in the flue gas purification system under normal production conditions. Multiple heating system exchange cycles are continuously collected to form a standard curve of periodic changes in characteristic flue gas components. Real-time data collection of characteristic flue gas components in the flue gas purification system is performed while the coke oven is in a pre-test production state. The characteristic flue gas component data of the flue gas purification system under the coke oven production state to be tested are compared with the data of the corresponding time point of the periodic change standard curve. When the comparison result is greater than the threshold range, the leakage state is judged in combination with the coke oven production process at this time, and the cause of leakage is distinguished. When obtaining the concentration threshold range of characteristic flue gas, one data point is collected every minute. The time of each heating system exchange cycle is used as the horizontal axis. The characteristic flue gas component data in different heating system exchange cycles are superimposed to generate a scatter plot, so as to obtain the threshold range of characteristic flue gas components of the coke oven at different time points in the heating system exchange cycle. During real-time data acquisition of characteristic flue gas components, CO and... Data collection is conducted on the components, or on the components of CO and non-methane total hydrocarbons. When determining the leakage status, the calculation terminal uses the concentration threshold range of characteristic flue gas components of the flue gas purification system under normal production conditions, the periodic alternating heating law of the double flue of the coke oven heating system, and the pressure change characteristics during coal charging and dry distillation in the carbonization chamber to verify and analyze whether the online flue gas component trend is abnormal, and the relationship between the abnormal flue gas component trend and the coke oven heating system and the coke oven pushing and coal charging operation, to determine whether there is a leakage problem in the coke oven. When determining whether there is a leakage problem in the coke oven, it can be judged directly by whether the concentration of characteristic flue gas components exceeds the threshold range, or by accurately judging by the method of calculating the moving average of the concentration of characteristic flue gas components. When determining whether there is a leakage problem in the coke oven: After the gas heating system of the coke oven exchanges gas every half hour, the CO concentration surges, indicating that the exchange tube is not in place, causing the heated gas to leak into the flue gas purification system before reaching the combustion chamber. A surge in the content or concentration of non-methane total hydrocarbons indicates that coke oven gas has leaked into the flue gas purification system. During the coking process, The concentration surged, and the CO concentration also increased, indicating that raw coal gas had leaked into the flue gas purification system. During the coal loading process, The concentration surged, and the CO concentration increased at the same time. Since the coal charging operation in different coke oven carbonization chambers was carried out according to the production plan, it was determined that there was leakage in the furnace wall of the coke oven carbonization chamber during the coal charging operation. During the heating process using manufactured gas, The increase in CO concentration indicates that manufactured gas has leaked into the flue gas purification system. This is because the CO concentration increases during the heating process using blast furnace gas. No significant changes were observed, indicating that blast furnace gas had leaked into the flue gas purification system.

2. The method for judging coke oven leakage based on characteristic flue gas components of a flue gas purification system according to claim 1, characterized in that: When forming a standard curve for the periodic variation of characteristic flue gas components, the standard curve includes two adjacent heating states, one of which is combustion in odd-numbered flues and the other is combustion in even-numbered flues. First, abnormal data of characteristic flue gas components during the heating exchange period of the flue gas purification system are removed. Then, the characteristic flue gas component data covering both odd-numbered and even-numbered flue combustion are summarized and regression analysis is performed to form a curve fit on the time series, thereby completing the establishment of the standard curve for periodic variation.

3. The method for judging coke oven leakage based on characteristic flue gas components of a flue gas purification system according to claim 1, characterized in that: When collecting real-time data on characteristic flue gas components, a flue gas component detection unit is used. This unit is installed at the inlet or outlet of the flue gas purification system to perform online detection of characteristic flue gas component data and send the detection data to the computing terminal for storage.

4. The method for judging coke oven leakage based on characteristic flue gas components of a flue gas purification system according to claim 1, characterized in that: The periodic alternating heating pattern of the dual-channel heating system refers to the fact that the coke oven heating system is a dual-channel system. When the odd-numbered channels are burning with rising airflow, the adjacent even-numbered channels are burning with descending airflow to discharge waste gas. The heating and exchange occur at fixed intervals. The even-numbered channels become burning with rising airflow, and the adjacent odd-numbered channels become burning with descending airflow to discharge waste gas. The cycle from combustion in the odd-numbered channels to combustion in the even-numbered channels is one heating system exchange cycle. The pressure change characteristics during coal charging and carbonization in the carbonization chamber refer to the periodic change pattern of pressure in the carbonization chamber during one cycle from coal feeding to coke maturation and coke pushing. This can be measured by installing pressure guiding pipes at the furnace door, coal feeding port at the furnace top, riser pipe, bridge pipe, and other parts.

5. The method for judging coke oven leakage based on characteristic flue gas components of a flue gas purification system according to claim 1, characterized in that: When determining whether there is a leakage problem in a coke oven, one can directly judge by whether the concentration of characteristic flue gas components exceeds the threshold range, or make a precise judgment by calculating the moving average of the concentration of characteristic flue gas components.

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