Method for regulating pressure in an electrically heated coke oven

Abstract

The present application relates to coke oven control technical field, especially to a kind of electric heating coke oven in-furnace pressure regulating method, comprising: obtaining the current actual pressure value of carbonization chamber, and combining the micro-positive pressure target range of carbonization chamber, the carbonization chamber pressure regulating target amplitude is obtained by calculation;Determine the pressure regulating boundary value corresponding to the multiple pressure regulating associated subsystem;Select minimum value from multiple pressure regulating boundary values, as the pressure regulating maximum feasible amplitude under current working condition;Compare the size of pressure regulating maximum feasible amplitude and carbonization chamber pressure regulating target amplitude: if pressure regulating maximum feasible amplitude is greater than or equal to carbonization chamber pressure regulating target amplitude, then control the pressure regulating device of the subsystem corresponding to pressure regulating maximum feasible amplitude, and adjust carbonization chamber pressure according to carbonization chamber pressure regulating target amplitude. It can be stably controlled in micro-positive pressure target range, avoid each subsystem over-boundary operation.

Description

Technical Field

[0001] This invention relates to the technical field of coking oven control, and more particularly to a method for regulating the internal pressure of an electrically heated coking oven. Background Technology

[0002] During the coking process, it is necessary to maintain a stable slightly positive pressure inside the carbonization chamber. If the pressure is too low, air will be drawn into the furnace, causing combustion losses of coke and chemical products, and affecting the stable operation of the coke oven heating system. If the pressure is too high, raw coal gas will leak from the furnace door, coal charging hole and other unsealed parts, causing environmental pollution, energy waste and accelerated furnace damage.

[0003] Existing coking oven pressure regulation methods typically rely on single actuators such as raw gas regulating flaps or flue gas suction baffles, with their corresponding single process parameters as the regulation targets. However, a coking oven is a complex system whose pressure regulation capability is constrained by many subsystems, such as the processing capacity of the raw gas system, the upper limit of auxiliary gas supply, the mechanical stress that the furnace wall structure can withstand, and the effective range of flue gas suction.

[0004] Existing single-variable regulation methods cannot take into account the real-time operating status and physical boundaries of multiple subsystems, which may cause the regulation action to exceed the tolerance of an unknown subsystem. For example, excessively increasing the auxiliary gas supply to increase pressure while ignoring the tolerance limit of the furnace wall structure may induce equipment damage or safety accidents. Summary of the Invention

[0005] This invention provides a method for regulating the pressure inside an electrically heated coking oven that can stably control the pressure within a slightly positive pressure target range and prevent each subsystem from operating beyond its boundary, effectively solving the problems in the background art.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a method for regulating the pressure inside an electrically heated coking oven, comprising:

[0007] The current actual pressure value of the carbonization chamber is obtained, and the target amplitude of the carbonization chamber pressure regulation is calculated by combining the target range of the micro-positive pressure of the carbonization chamber.

[0008] Determine the pressure regulation boundary values ​​for multiple subsystems associated with pressure regulation;

[0009] The minimum value among the multiple pressure regulation boundary values ​​is selected as the maximum feasible pressure regulation amplitude under the current operating condition.

[0010] Compare the maximum feasible range of pressure regulation with the target range of carbonization chamber pressure regulation:

[0011] If the maximum feasible range of pressure regulation is greater than or equal to the target range of carbonization chamber pressure regulation, then the pressure regulation device of the subsystem corresponding to the maximum feasible range of pressure regulation is controlled to regulate the carbonization chamber pressure according to the target range of carbonization chamber pressure regulation.

[0012] If the maximum feasible range of pressure regulation is less than the target range of pressure regulation in the carbonization chamber, a pressure anomaly alarm will be triggered.

[0013] In conjunction with the first aspect, in one possible design, the target range of the micro-positive pressure in the carbonization chamber is set based on the effective volume of the carbonization chamber of the electrically heated coking furnace and the sealing characteristics and resistance strength of the furnace body lining material. This can prevent cold air from entering the carbonization chamber and causing the coke to burn, while also preventing excessive pressure inside the furnace from causing the coke to burn.

[0014] In conjunction with the first aspect, in one possible design, the plurality of pressure regulation-related subsystems include at least two of the following: a raw gas treatment system, a furnace wall structure system, an auxiliary gas supply system, and a flue gas suction system.

[0015] In conjunction with the first aspect, in one possible design, the plurality of pressure regulation boundary values ​​includes at least two of the following: raw coal gas-related pressure regulation boundary value, furnace wall withstand pressure regulation boundary value, auxiliary coal gas-related pressure regulation boundary value, and flue gas suction-related pressure regulation boundary value.

[0016] In conjunction with the first aspect, in one possible design, the pressure regulating device includes a raw coal gas purification and regulating device, a furnace door slide system, an auxiliary coal gas supply valve, and a flue suction baffle.

[0017] In conjunction with the first aspect, in one possible design, the determination of the boundary value of the raw coal gas associated pressure regulation is based on: the upper limit of the raw coal gas processing capacity of the raw coal gas processing system, combined with the coupling relationship between the raw coal gas output rate and the carbonization chamber pressure, to ensure that the raw coal gas can enter the combustion furnace in time for full combustion to maintain pressure stability.

[0018] The determination of the furnace wall's pressure tolerance adjustment boundary value is based on the difference between the real-time furnace wall expansion pressure detected by the expansion pressure measuring device and the maximum allowable expansion pressure corresponding to the transverse compressive strength of the electric heating coking furnace body masonry material, and can prevent the furnace body from being damaged due to excessive expansion pressure.

[0019] The determination of the auxiliary gas associated pressure regulation boundary value is based on the maximum allowable amount of the auxiliary gas supply valve, combined with the influence law of the auxiliary gas usage on the thermal intensity of the combustion furnace in the raw coal gas treatment system, to ensure that the combustion furnace can maintain stable combustion efficiency to support pressure regulation.

[0020] The determination of the boundary value of the flue suction-related pressure adjustment is based on the normal operating suction range of the flue suction baffle, combined with the balance between flue suction and carbonization chamber pressure, to ensure that the furnace pressure can be maintained in a stable range and does not deviate from the normal operating state.

[0021] In conjunction with the first aspect, in one possible design, the method for determining the pressure regulating device of the subsystem corresponding to the maximum feasible amplitude of the pressure regulation includes:

[0022] The pressure regulating device of the subsystem corresponding to the maximum feasible amplitude of pressure regulation is selected as the pressure regulating device;

[0023] If the pressure regulation boundary values ​​of multiple subsystems are all equal to the minimum value, then the pressure regulation device is determined based on the current operating conditions.

[0024] In conjunction with the first aspect, in one possible design, if the pressure regulation boundary values ​​of multiple subsystems are all equal to the minimum value, then the pressure regulation device is determined based on the current operating conditions, including:

[0025] Calculate the regulation response rate of each candidate subsystem pressure regulator. The faster the response rate, the higher the priority of the pressure regulator, and it will be given priority in scenarios where pressure deviation needs to be corrected quickly.

[0026] In conjunction with the first aspect, in one possible design, if the pressure regulation boundary values ​​of multiple subsystems are all equal to the minimum value, then the pressure regulation device is determined based on the current operating conditions, including:

[0027] Based on the energy consumption per unit adjustment amplitude of each pressure regulating device, the device with lower energy consumption has higher priority in long-term stable regulation scenarios and is given priority for use in scenarios requiring energy-saving operation.

[0028] Secondly, the present invention also provides a pressure regulating system for an electrically heated coking oven, comprising:

[0029] The pressure monitoring module is used to obtain the current actual pressure value of the carbonization chamber;

[0030] The target amplitude calculation module is used to calculate the target amplitude of the carbonization chamber pressure regulation by combining the micro-positive pressure target range of the carbonization chamber;

[0031] The boundary value determination module is used to determine the pressure regulation boundary values ​​corresponding to multiple subsystems associated with pressure regulation;

[0032] The amplitude selection module is used to select the minimum value from the plurality of pressure regulation boundary values ​​as the maximum feasible amplitude of pressure regulation under the current operating condition.

[0033] The adjustment control module is used to compare the maximum feasible range of pressure adjustment with the target range of carbonization chamber pressure adjustment: if the maximum feasible range of pressure adjustment is greater than or equal to the target range of carbonization chamber pressure adjustment, then the pressure adjustment device of the subsystem corresponding to the maximum feasible range of pressure adjustment is controlled to adjust the carbonization chamber pressure according to the target range of carbonization chamber pressure adjustment.

[0034] The anomaly handling module is used to trigger a pressure anomaly alarm when the maximum feasible range of pressure regulation is less than the target range of pressure regulation in the carbonization chamber.

[0035] The technical solution of this invention achieves the following technical effects: By determining the pressure regulation boundary values ​​corresponding to multiple subsystems associated with pressure regulation, the hardware performance and process safety upper limits of each subsystem are transformed into quantifiable regulation boundaries. Multi-dimensional constraints are added to the regulation logic to avoid regulation failure due to overload or insufficient capacity of a single subsystem, thus solving the problem that single-variable regulation cannot meet all the pressure regulation requirements of the carbonization chamber. By selecting the minimum value from multiple pressure regulation boundary values ​​as the maximum feasible range of pressure regulation under the current operating conditions, it is ensured that the regulation action is always within the safe operating range of all subsystems. By explicitly controlling the pressure regulation device of the subsystem corresponding to the maximum feasible range of pressure regulation, the boundary value of the subsystem to which this pressure regulation device belongs is the minimum value among all subsystems, and its regulation capability is adapted to the most stringent safety constraints under the current operating conditions, ensuring that the regulation action will not abruptly change. This method breaks through the boundaries of any subsystem while avoiding inefficient or failed regulation due to mismatch between device capacity and constraints. By identifying a pressure regulating device corresponding to the maximum feasible amplitude, the regulating capacity of this device precisely covers the regulation requirements under the current safety constraints. When operating according to the target amplitude of the carbonization chamber pressure regulation, no additional devices need to be called, ensuring that the regulation action falls precisely within the micro-positive pressure target range. In this method, device selection is based on boundary values, and regulation operation is based on the target amplitude. Even if the operating conditions change, as long as the boundary values ​​are updated, the corresponding device and regulation action will be adapted synchronously, ensuring that every regulation is carried out within the safety framework and improving the safety of the regulation process. On the other hand, when the pressure regulation demand exceeds the system's maximum capacity, an alarm is immediately triggered and regulation stops, which not only prevents equipment overload but also provides clear fault location guidance for maintenance personnel, improving the maintainability of the system. Attached Figure Description

[0036] Figure 1 This is a logic flowchart of the pressure regulation method inside the electrically heated coking oven in this invention;

[0037] Figure 2 This is a structural block diagram of the pressure regulation system inside the electrically heated coking oven in this invention. Detailed Implementation

[0038] This application will now be described with reference to the accompanying drawings.

[0039] like Figure 1 As shown, a method for regulating the pressure inside an electrically heated coking oven according to the present invention specifically includes the following steps:

[0040] Step S1: Obtain the current actual pressure value of the carbonization chamber, and calculate the target amplitude of the carbonization chamber pressure regulation by combining it with the micro-positive pressure target range of the carbonization chamber.

[0041] Step S2: Determine the pressure regulation boundary values ​​corresponding to multiple subsystems associated with pressure regulation;

[0042] Step S3: Select the minimum value from the plurality of pressure regulation boundary values ​​as the maximum feasible amplitude of pressure regulation under the current operating condition;

[0043] Step S4: Compare the maximum feasible range of pressure regulation with the target range of carbonization chamber pressure regulation.

[0044] If the maximum feasible range of pressure regulation is greater than or equal to the target range of carbonization chamber pressure regulation, then the pressure regulation device of the subsystem corresponding to the maximum feasible range of pressure regulation is controlled to regulate the carbonization chamber pressure according to the target range of carbonization chamber pressure regulation; the pressure regulation device includes a raw coal gas purification and regulation device, a furnace door slide system, an auxiliary coal gas supply valve, and a flue suction baffle.

[0045] If the maximum feasible range of pressure regulation is less than the target range of pressure regulation in the carbonization chamber, a pressure anomaly alarm will be triggered.

[0046] In this embodiment, by determining the pressure regulation boundary values ​​corresponding to multiple subsystems associated with pressure regulation, the hardware performance and process safety upper limit of each subsystem are transformed into quantifiable regulation boundaries. Multi-dimensional constraints are added to the regulation logic to avoid regulation failure caused by overload or insufficient capacity of a single subsystem, thus solving the problem that single-variable regulation cannot meet all the requirements of carbonization chamber pressure regulation.

[0047] By selecting the minimum value from multiple pressure regulation boundary values ​​as the maximum feasible range of pressure regulation under the current operating conditions, it is ensured that the regulation action is always within the safe operating range of all subsystems. By clearly controlling the pressure regulation device of the subsystem corresponding to the maximum feasible range of pressure regulation, the boundary value of the subsystem to which the pressure regulation device belongs is the minimum value of all subsystems. Its regulation capability is adapted to the most stringent safety constraints under the current operating conditions, ensuring that the regulation action will not exceed the boundary of any subsystem, while avoiding the problem of inefficient regulation or failure due to the mismatch between device capability and constraints.

[0048] By identifying a pressure regulating device corresponding to the maximum feasible amplitude, the regulating capacity of this device precisely covers the regulation requirements under the current safety constraints. When operating according to the target amplitude of the carbonization chamber pressure regulation, no additional devices need to be called, ensuring that the regulation action accurately falls within the micro-positive pressure target range. In this method, device selection is based on boundary values, and the regulation operation is based on the target amplitude. Even if the operating conditions change, as long as the boundary values ​​are updated, the corresponding device and regulation action will be adapted synchronously, ensuring that every regulation is carried out within the safety framework and improving the safety of the regulation process. On the other hand, when the pressure regulation demand exceeds the system's maximum capacity, an alarm is immediately triggered and regulation is stopped, which not only prevents equipment overload but also provides clear fault location guidance for maintenance personnel, improving the maintainability of the system.

[0049] As some embodiments of the present invention, in step S1, the method for calculating the target amplitude of pressure regulation includes:

[0050] Step S11: Obtain the current actual pressure value of the carbonization chamber. The pressure data inside the carbonization chamber is collected in real time through the pressure sensing module in the electrical and control system of the test coke oven configured in the electric heating coke oven.

[0051] Step S12: Set the target range for the micro-positive pressure in the carbonization chamber. This target range is not a fixed value but is determined based on the equipment characteristics and process requirements of the electrically heated coking furnace. On one hand, carbonization chambers of different volumes have different internal gas flow states and pressure transmission characteristics. The volume parameter directly affects the pressure range required to maintain the micro-positive pressure; therefore, it needs to be considered in conjunction with the effective volume of the carbonization chamber. On the other hand, materials with good sealing properties can reduce pressure leakage, affecting the lower limit of the target range, while the material's strength determines the upper limit of the target range. It is necessary to ensure that the pressure does not exceed the mechanical stress that the material can withstand. Therefore, the micro-positive pressure target range also needs to match the sealing properties and strength of the furnace body lining material. Simultaneously, the micro-positive pressure target range needs to meet dual process functions: both by maintaining a micro-positive pressure to prevent external cold air from entering the carbonization chamber, avoiding contact between cold air and high-temperature coal cake leading to coke burning; and by limiting the upper pressure limit, preventing excessive pressure inside the furnace from causing abnormal coke combustion.

[0052] Step S13: Calculate the target amplitude of the carbonization chamber pressure regulation. Based on the current actual pressure value obtained above and the set micro-positive pressure target range, calculate the deviation value between the two. This deviation value is the target amplitude of the pressure regulation, which is used to characterize the pressure adjustment range required to make the carbonization chamber pressure return from the current actual value to the micro-positive pressure target range.

[0053] In some embodiments of the present invention, the coking oven is a complex device with multiple coupled subsystems. The pressure regulation of the carbonization chamber is constrained by multiple dimensions such as the raw gas processing capacity, the furnace wall bearing strength, the auxiliary gas supply, and the flue suction. In order to avoid the problem of over-reliance on a certain subsystem for pressure regulation, which may cause it to exceed the safe operating range, or the regulation range may be too small to meet the requirement of pressure returning to the target range, it is necessary to determine the pressure regulation boundary values ​​of multiple subsystems. Essentially, this is to establish a safe operating baseline for pressure regulation. By quantifying the maximum regulation capacity of each subsystem, it is ensured that subsequent regulation actions are always carried out within the range of equipment safety and process stability.

[0054] Specifically, for the raw coal gas treatment system, the boundary value of the raw coal gas-related pressure regulation is determined according to the following steps:

[0055] Step S211: Collect real-time processing volume data of the raw coal gas treatment system through the experimental coke oven electrical and control system. Combined with the upper limit of the raw coal gas treatment capacity designed by the system, the maximum processing volume marked on the nameplate of the raw coal gas treatment equipment can be used to determine the maximum rate at which raw coal gas can be safely exported under the current working conditions.

[0056] Step S212: Fit a coupling model of raw coal gas output rate and carbonization chamber pressure using historical operating data to reflect the dynamic correlation between the two. Calculate the pressure regulation amplitude that can be achieved at the maximum output rate using the coupling model. This amplitude is the boundary value for raw coal gas-related pressure regulation, ensuring that raw coal gas can enter the combustion furnace in time for full combustion and avoiding abnormal pressure rise in the carbonization chamber due to poor output.

[0057] For the furnace wall structure system, the boundary values ​​for adjusting the furnace wall's withstand pressure are determined according to the following steps:

[0058] Step S221: Collect real-time expansion pressure data of the furnace wall using an expansion pressure measuring device. It should be noted that the real-time expansion pressure data of the furnace wall should at least cover the key stress points of the furnace wall on different sides of the carbonization chamber.

[0059] Step S222: Obtain the transverse compressive strength limit of the furnace body masonry material and calculate its corresponding maximum allowable expansion pressure;

[0060] Step S223: Based on the difference between the maximum allowable expansion pressure and the real-time expansion pressure, and combined with the safety redundancy coefficient of the furnace body structure determined based on the equipment design standards, determine the boundary value of the furnace wall's pressure tolerance adjustment to ensure that pressure adjustment will not cause the furnace wall to be damaged due to excessive expansion pressure.

[0061] For the auxiliary gas supply system, the auxiliary gas associated pressure regulation boundary value is determined according to the following steps:

[0062] Step S231: Obtain the maximum allowable usage parameters of the auxiliary gas supply valve, wherein the maximum allowable usage parameters are determined based on pipeline design and safety specifications;

[0063] Step S232: Monitor the real-time correlation data between the thermal intensity of the combustion furnace and the amount of auxiliary gas through the electrical and control system of the test coke oven. Combine the mapping relationship between the amount of auxiliary gas, the thermal intensity of the combustion furnace and the pressure regulation effect established through process experiments, calculate the pressure regulation amplitude that the combustion furnace can stably support within the maximum allowable usage range. This amplitude is the auxiliary gas-related pressure regulation boundary value, ensuring that the supply of auxiliary gas will not affect the combustion stability due to excessive usage.

[0064] For flue gas suction systems, determine the flue gas suction-related pressure regulation boundary values ​​according to the following steps:

[0065] Step S241: Based on the equipment operation manual, determine the normal operating suction range of the flue suction baffle;

[0066] Step S242: Collect real-time corresponding data of flue suction and carbonization chamber pressure through pressure sensor, fit the balance relationship model between the two, and reflect the influence of suction change on carbonization chamber pressure.

[0067] Step S243: Based on the above model, calculate the pressure adjustment amplitude that can be achieved within the normal suction range. This amplitude is the boundary value of the pressure adjustment associated with the flue suction, ensuring that the adjustment of the flue suction will not cause the carbonization chamber pressure to deviate from the normal operating range.

[0068] In this embodiment, by determining the pressure regulation boundary values ​​of each subsystem in different dimensions, the originally scattered constraints such as raw coal gas treatment, furnace wall stress, coal gas supply, and flue balance are uniformly quantified to avoid regulation risks caused by omitting a certain boundary. The determination of each boundary value is based on equipment parameters, real-time data, and process models to quantify the correspondence between safe operation and regulation capability, ensuring that pressure regulation actions are always carried out within the range that the equipment can withstand and the process allows.

[0069] More specifically, in the implementation of this invention, various models are used to quantitatively characterize the dynamic correlation between key parameters of each subsystem and the carbonization chamber pressure. These include, but are not limited to, a coupling model of raw coal gas extraction rate and carbonization chamber pressure, a mapping relationship model of auxiliary coal gas consumption and pressure regulation effect, and a balance relationship model of flue gas suction and carbonization chamber pressure. The construction of these models is the core foundation for realizing the intelligent, multi-constraint pressure regulation of this invention. Those skilled in the art should understand that the establishment of these models can be achieved through theoretical analysis of the system's operating mechanism, statistical analysis of historical operating data, or a combination of both, and is not limited to a specific mathematical modeling method. Specifically:

[0070] The model can be based on fundamental principles of fluid mechanics, heat transfer, and combustion to establish a mechanistic model; it can also be based on historical or real-time system operation data, using mathematical statistics, regression analysis, or machine learning algorithms for fitting, or a hybrid modeling approach combining mechanism and data; its final representation can be in the form of mathematical formulas, lookup tables, graphs, or fitting functions; specific parameters such as coefficients and exponents in the model can be obtained through equipment design parameters, testing input-output responses under specific operating conditions and recording data, or injecting small test signals during normal operation and identifying parameters based on system responses; to ensure the accuracy of the model, it can be periodically or in real-time calibrated online or offline using the latest operating data according to actual conditions such as equipment aging, changes in coking cycles, or fluctuations in fuel characteristics.

[0071] For example, the coupling model between the raw coal gas extraction rate and the carbonization chamber pressure can be constructed in any of the following ways:

[0072] Method 1: Theoretical derivation based on Darcy's formula or Bernoulli's equation for gas flow is carried out to establish the theoretical framework of its functional relationship Q=f(P), and then the parameters such as the drag coefficient in the formula are determined through a small amount of field test data.

[0073] Method 2: Directly collect a large amount of historical data under different working conditions, including the pressure value of the carbonization chamber and the corresponding raw coal gas flow rate, and use regression analysis techniques such as the least squares method to fit an empirical formula or curve;

[0074] Method 3: Using machine learning algorithms such as neural networks, the network is trained with the carbonization chamber pressure and other relevant operating parameters as input and the raw coal gas extraction rate as output, thereby obtaining a high-precision black box model.

[0075] Other models can also be constructed using similar approaches. This invention protects the methods for implementing multi-boundary value decision-making and collaborative control using these models, rather than specific forms of models. Any model construction method that can accurately or sufficiently reflect the correlation between the above parameters falls within the scope of protection of this invention.

[0076] In some embodiments of the present invention, step S3 determines the maximum adjustment capacity that all subsystems can withstand under the current operating conditions by filtering the minimum value among multiple boundary values. This minimum value is used to characterize the adjustment amplitude that will not exceed the safety boundary regardless of which subsystem dimension is considered, thus ensuring that subsequent pressure adjustment actions are always carried out within the range of equipment safety and process stability.

[0077] Specifically, retrieve all pressure regulation boundary values ​​calculated in step S2, including but not limited to the raw gas-related pressure regulation boundary value, furnace wall withstand pressure regulation boundary value, auxiliary gas-related pressure regulation boundary value, and flue gas suction-related pressure regulation boundary value; ensure that the units and data formats of all boundary values ​​are consistent to avoid affecting the comparison results due to format differences;

[0078] All pressure regulation boundary values ​​with uniform units and formats are compared numerically. The comparison process is based on the absolute value of the pressure regulation amplitude, without distinguishing the type of the subsystem corresponding to the boundary value, and only judging the strength of the relationship by the numerical value. The minimum value in the numerical comparison results is selected and defined as the maximum feasible amplitude of pressure regulation under the current operating condition. At the same time, the subsystem type corresponding to the minimum value is automatically recorded. If step S2 only determines the pressure regulation boundary values ​​of two or three subsystems, the above process is still followed, directly comparing the existing boundary values ​​and selecting the minimum value as the maximum feasible amplitude of pressure regulation.

[0079] In this embodiment, the boundary value corresponding to the minimum value is the safety baseline of all subsystems under the current operating conditions. Using this as the maximum feasible amplitude ensures that subsequent pressure regulation actions will not exceed the safety threshold of any subsystem. Regardless of which subsystem is relied upon when regulating according to this amplitude, the safety requirements of other subsystems can be met simultaneously, avoiding equipment damage and process abnormalities. During the coking process, the pressure regulation boundary values ​​of each subsystem will dynamically change with the coking stage, coal characteristics, equipment status, and other operating conditions. Step S3 selects the minimum value each time based on the latest boundary value under the current operating conditions, so that the maximum feasible amplitude of pressure regulation is updated synchronously, ensuring that the regulation actions always adapt to the current operating conditions throughout the entire coking cycle, maintaining long-term regulation stability, and avoiding regulation failure due to changes in operating conditions.

[0080] As some embodiments of the present invention, after determining the relationship between the maximum feasible range of pressure regulation and the target range of carbonization chamber pressure regulation, it is necessary to combine the dynamic operating conditions of the electrically heated coking oven, the cooperative characteristics of the subsystems, and the emergency handling requirements to execute differentiated regulation control logic and abnormal response strategies.

[0081] When the maximum feasible range of pressure regulation meets or exceeds the target range of carbonization chamber pressure regulation, it indicates that the safety boundaries of all current subsystems can support the requirement for pressure to return to the slightly positive pressure target range. The following procedure should be followed to select and control the pressure regulation device to perform the regulation action:

[0082] Step S411: Prioritize selecting the pressure regulating device of the subsystem corresponding to the maximum feasible range of pressure regulation as the regulating device. If the pressure regulation boundary values ​​of multiple subsystems are all equal to the minimum value, then determine the regulating device based on the regulation efficiency, energy consumption cost, and equipment loss coefficient under the current operating conditions. The specific rules are as follows:

[0083] Step S412: Calculate the adjustment response rate of each candidate subsystem pressure regulation device. The faster the response rate, the higher the priority of the device, and it is given priority for use in scenarios where pressure deviation needs to be quickly corrected.

[0084] Step S413: Based on the unit adjustment amplitude energy consumption of each device, the device with lower energy consumption has higher priority in long-term stable adjustment scenarios, so as to achieve energy-saving operation.

[0085] Step S414: Refer to the historical loss data of the reference device, and statistically analyze the mechanical wear frequency of each device under the same adjustment amplitude. The device with the lower loss coefficient has a higher priority in high-frequency adjustment scenarios, thus extending the service life of the equipment.

[0086] Step S415: If the above parameters cannot clearly distinguish the priority, the raw coal gas purification and regulation device or the flue gas suction baffle can be selected as the regulation device by default. The two correspond to the two core pressure control loops of the coking oven, namely the raw coal gas system and the flue gas system, respectively, and have a wider range of working condition adaptability.

[0087] When the maximum feasible range of pressure regulation cannot meet the target range of carbonization chamber pressure regulation, it indicates that at least one subsystem has reached the safety boundary. Continuing to perform regulation may lead to equipment damage or process malfunction. The following procedures should be followed for abnormal alarm and emergency handling:

[0088] Step S421: Based on the degree of deviation between the maximum feasible range of pressure regulation and the target range of carbonization chamber pressure regulation, abnormal alarms are divided into Level 1 alarms and Level 2 alarms. The specific classification criteria and triggering methods are as follows:

[0089] Level 1 alarm: When the deviation rate between the maximum feasible range of pressure regulation and the target range of pressure regulation in the carbonization chamber is less than a certain proportion, a Level 1 alarm is triggered. Alarm signals include audible and visual alarms in the control room, pop-up prompts on the human-machine interface, and message pushes from the remote monitoring platform.

[0090] Level 2 alarm: When the deviation rate is greater than or equal to a certain percentage, a level 2 alarm is triggered. The alarm signal is based on the level 1 alarm and includes an on-site audible and visual alarm in the furnace area, an emergency shutdown pre-trigger signal, and a telephone notification to maintenance personnel.

[0091] Step S422: After triggering the pressure anomaly alarm, relevant data is automatically collected for fault location. Real-time operating parameters of the subsystem corresponding to the maximum feasible pressure regulation range are collected, including:

[0092] If it is a raw coal gas treatment system: real-time raw coal gas treatment capacity, combustion furnace temperature, raw coal gas pipeline pressure, and pressure difference between the inlet and outlet of the purification device;

[0093] If it is a furnace wall structure system: expansion pressure at each key stress point of the furnace wall, real-time temperature of the furnace body masonry material, and displacement of furnace wall gaps;

[0094] If it is an auxiliary gas supply system: auxiliary gas pipeline pressure, flow rate, purity, and deviation value between supply valve opening and command;

[0095] If it is a flue suction system: real-time flue suction, baffle opening, flue gas temperature, and flue gas composition;

[0096] Retrieve the operating data of the subsystem within a specific historical time period, compare the deviation between the current data and the historical normal data, and mark the deviation as an abnormal data point if it exceeds a certain percentage of the historical average. Analyze the correlation between the occurrence time of the abnormal data and changes in operating conditions.

[0097] Step S423: Based on the anomaly cause location results, provide targeted emergency handling suggestions and troubleshooting guidance to the maintenance personnel; the emergency handling for a Level 1 alarm is as follows:

[0098] If the abnormal subsystem is the raw coal gas treatment system: it is recommended to check whether the raw coal gas purification device is blocked. If it is blocked, start the backwashing device. If the treatment capacity is insufficient, appropriately increase the combustion furnace temperature to enhance the combustion efficiency of the raw coal gas.

[0099] If the abnormal subsystem is the furnace wall structure system: it is recommended to reduce the heating rate of the carbonization chamber to reduce the thermal expansion stress of the furnace wall; if the expansion pressure is close to the upper limit, the furnace wall cooling system should be turned on to control the expansion pressure within a safe range.

[0100] If the abnormal subsystem is an auxiliary gas supply system: it is recommended to check whether the gas pipeline is leaking. If there is a leak, close the relevant valves and plug the leak. If the flow is insufficient, switch to the backup gas source to ensure a stable supply.

[0101] If the abnormal subsystem is the flue suction system: it is recommended to clean the dust accumulated on the flue baffle, check the operating status of the induced draft fan, and start the standby induced draft fan if the output of the induced draft fan is insufficient.

[0102] The emergency response procedure for a Level 2 alarm is as follows:

[0103] Immediately stop the pressure regulation action in the carbonization chamber to prevent further overload of the subsystem;

[0104] If an abnormality causes the carbonization chamber pressure to fall below the lower limit of the target range: partially close the furnace door observation holes to reduce air intake; if the pressure continues to drop, stop the electric heating system to prevent coke combustion loss;

[0105] If an abnormality causes the carbonization chamber pressure to exceed the upper limit of the target range: open the raw coal gas vent valve to reduce the pressure inside the furnace; if the pressure continues to rise, open the furnace door immediately to release the pressure.

[0106] The maintenance personnel were organized to conduct on-site inspections. Based on the abnormal data points provided by the system and the historical comparison results, the corresponding equipment components were checked in detail. If a fault was found, the spare component was replaced immediately. After the fault was eliminated, the pressure regulation boundary value was recalculated. The alarm was lifted after confirming that there were no abnormalities.

[0107] In this embodiment, differentiated adjustment control logic and abnormal response strategies are used to achieve the safety, adaptability, and operability of pressure regulation within the electrically heated coking oven. When the maximum feasible amplitude of pressure regulation meets the regulation requirements, the regulating device is determined based on the subsystem boundary value, and priority rules are established by combining regulation efficiency, energy consumption cost, and equipment loss coefficient. This ensures that the regulation action is always within the safety boundaries of each subsystem, while also adapting to different operating conditions such as rapid correction, long-term stability, and high-frequency regulation. At the same time, the regulating device of the pressure control loop is selected by default to improve the adaptability of operating conditions. When the pressure regulation capacity is insufficient, a graded alarm mechanism accurately transmits the degree of abnormality. Combining real-time and historical data of the subsystem, the cause of the fault is located, and targeted first- and second-level emergency handling solutions are provided. This can quickly curb the risk of subsystem overload, avoid equipment damage and process loss of control, and provide clear fault diagnosis guidance for operation and maintenance personnel, ensuring the controllability and recovery efficiency of the system under abnormal conditions, and achieving stable control of the carbonization chamber pressure under all operating conditions.

[0108] like Figure 2 As shown, the present invention also provides a method for regulating the pressure inside an electrically heated coking oven, specifically including the following modules;

[0109] The pressure monitoring module is used to obtain the current actual pressure value of the carbonization chamber;

[0110] The target amplitude calculation module is used to calculate the target amplitude of the carbonization chamber pressure regulation by combining the micro-positive pressure target range of the carbonization chamber;

[0111] The boundary value determination module is used to determine the pressure regulation boundary values ​​corresponding to multiple subsystems associated with pressure regulation;

[0112] The amplitude selection module is used to select the minimum value from the plurality of pressure regulation boundary values ​​as the maximum feasible amplitude of pressure regulation under the current operating condition.

[0113] The adjustment control module is used to compare the maximum feasible range of pressure adjustment with the target range of carbonization chamber pressure adjustment: if the maximum feasible range of pressure adjustment is greater than or equal to the target range of carbonization chamber pressure adjustment, then the pressure adjustment device of the subsystem corresponding to the maximum feasible range of pressure adjustment is controlled to adjust the carbonization chamber pressure according to the target range of carbonization chamber pressure adjustment.

[0114] The anomaly handling module is used to trigger a pressure anomaly alarm when the maximum feasible range of pressure regulation is less than the target range of pressure regulation in the carbonization chamber.

[0115] In this embodiment, the pressure monitoring module and the target amplitude calculation module work together to accurately obtain the pressure regulation requirements, avoiding inaccurate regulation due to pressure perception deviation. The boundary value determination module clarifies the pressure regulation boundaries of multiple subsystems, avoiding the risk of regulation actions exceeding the subsystem's capacity. The amplitude comparison and selection module selects the minimum boundary value as the maximum feasible amplitude, ensuring that the regulation is always within the safe range of each subsystem, preventing furnace damage or safety accidents caused by over-regulation. Finally, through the collaboration of the regulation control module and the anomaly handling module, pressure regulation can be accurately executed within the feasible range to maintain a stable micro-positive pressure in the carbonization chamber, avoiding combustion loss due to excessively low pressure or raw gas leakage due to excessively high pressure. It can also promptly alarm when the regulation capacity is insufficient, ensuring the controllability of system operation and solving the problem that existing methods cannot coordinate the boundaries of multiple subsystems and are prone to inducing equipment damage.

[0116] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for regulating the pressure inside an electrically heated coking oven, characterized in that, include: The current actual pressure value of the carbonization chamber is obtained, and the target amplitude of the carbonization chamber pressure regulation is calculated by combining the target range of the micro-positive pressure of the carbonization chamber. Determine the pressure regulation boundary values ​​for multiple subsystems associated with pressure regulation; The minimum value among the multiple pressure regulation boundary values ​​is selected as the maximum feasible amplitude of pressure regulation under the current operating condition. Compare the maximum feasible range of pressure regulation with the target range of carbonization chamber pressure regulation: If the maximum feasible range of pressure regulation is greater than or equal to the target range of carbonization chamber pressure regulation, then the pressure regulation device of the subsystem corresponding to the maximum feasible range of pressure regulation is controlled to regulate the carbonization chamber pressure according to the target range of carbonization chamber pressure regulation. If the maximum feasible range of pressure regulation is less than the target range of pressure regulation in the carbonization chamber, a pressure anomaly alarm will be triggered.

2. The method for regulating the pressure inside an electrically heated coking oven according to claim 1, characterized in that, The target range of the micro-positive pressure in the carbonization chamber is set based on the effective volume of the carbonization chamber of the electrically heated coking furnace and the sealing characteristics and resistance strength of the furnace body masonry material. It can prevent cold air from entering the carbonization chamber and causing the coke to burn, while preventing excessive pressure in the furnace from causing the coke to burn.

3. The method for regulating the internal pressure of an electrically heated coking oven according to claim 1, characterized in that, The plurality of pressure regulation-related subsystems include at least two of the following: raw coal gas treatment system, furnace wall structure system, auxiliary coal gas supply system, and flue gas suction system.

4. The method for regulating the pressure inside an electrically heated coking oven according to claim 3, characterized in that, The plurality of pressure regulation boundary values ​​include at least two of the following: raw coal gas related pressure regulation boundary value, furnace wall withstand pressure regulation boundary value, auxiliary coal gas related pressure regulation boundary value, and flue gas suction related pressure regulation boundary value.

5. The method for regulating the pressure inside an electrically heated coking oven according to claim 4, characterized in that, The pressure regulating device includes a raw coal gas purification and regulating device, a furnace door slide system, an auxiliary coal gas supply valve, and a flue suction baffle.

6. The method for regulating the pressure inside an electrically heated coking oven according to claim 5, characterized in that, The determination of the boundary value of the raw coal gas associated pressure regulation is based on the upper limit of the raw coal gas processing capacity of the raw coal gas treatment system, combined with the coupling relationship between the raw coal gas output rate and the carbonization chamber pressure, to ensure that the raw coal gas can enter the combustion furnace in time for full combustion to maintain pressure stability. The determination of the furnace wall's pressure tolerance adjustment boundary value is based on the difference between the real-time furnace wall expansion pressure detected by the expansion pressure measuring device and the maximum allowable expansion pressure corresponding to the transverse compressive strength of the electric heating coking furnace body masonry material, and can prevent the furnace body from being damaged due to excessive expansion pressure. The determination of the auxiliary gas associated pressure regulation boundary value is based on the maximum allowable amount of the auxiliary gas supply valve, combined with the influence law of the auxiliary gas usage on the thermal intensity of the combustion furnace in the raw coal gas treatment system, to ensure that the combustion furnace can maintain stable combustion efficiency to support pressure regulation. The determination of the boundary value of the flue suction-related pressure adjustment is based on the normal operating suction range of the flue suction baffle, combined with the balance between flue suction and carbonization chamber pressure, to ensure that the furnace pressure can be maintained in a stable range and does not deviate from the normal operating state.

7. A method for regulating the pressure inside an electrically heated coking oven according to claim 6, characterized in that, The method for determining the pressure regulating device of the subsystem corresponding to the maximum feasible amplitude of the pressure regulation includes: The pressure regulating device of the subsystem corresponding to the maximum feasible amplitude of pressure regulation is selected as the pressure regulating device; If the pressure regulation boundary values ​​of multiple subsystems are all equal to the minimum value, then the pressure regulation device is determined based on the current operating conditions.

8. The method for regulating the pressure inside an electrically heated coking oven according to claim 7, characterized in that, If the pressure regulation boundary values ​​of multiple subsystems are all equal to the minimum value, then the pressure regulation device is determined based on the current operating conditions, including: Calculate the regulation response rate of each candidate subsystem pressure regulator. The faster the response rate, the higher the priority of the pressure regulator, and it will be given priority in scenarios where pressure deviation needs to be corrected quickly.

9. A method for regulating the pressure inside an electrically heated coking oven according to claim 7, characterized in that, If the pressure regulation boundary values ​​of multiple subsystems are all equal to the minimum value, then the pressure regulation device is determined based on the current operating conditions, including: Based on the energy consumption per unit adjustment amplitude of each pressure regulating device, the device with lower energy consumption has higher priority in long-term stable regulation scenarios and is given priority for use in scenarios requiring energy-saving operation.

10. A pressure regulation system for an electrically heated coking oven, characterized in that, include: The pressure monitoring module is used to obtain the current actual pressure value of the carbonization chamber; The target amplitude calculation module is used to calculate the target amplitude of the carbonization chamber pressure regulation by combining the micro-positive pressure target range of the carbonization chamber; The boundary value determination module is used to determine the pressure regulation boundary values ​​corresponding to multiple subsystems associated with pressure regulation; The amplitude selection module is used to select the minimum value from multiple pressure regulation boundary values ​​as the maximum feasible amplitude of pressure regulation under the current operating condition. The adjustment control module is used to compare the maximum feasible range of pressure adjustment with the target range of carbonization chamber pressure adjustment: if the maximum feasible range of pressure adjustment is greater than or equal to the target range of carbonization chamber pressure adjustment, then the pressure adjustment device of the subsystem corresponding to the maximum feasible range of pressure adjustment is controlled to adjust the carbonization chamber pressure according to the target range of carbonization chamber pressure adjustment. The anomaly handling module is used to trigger a pressure anomaly alarm when the maximum feasible range of pressure regulation is less than the target range of pressure regulation in the carbonization chamber.

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