Oxygen enrichment system for a steel rolling furnace

Abstract

The utility model discloses a kind of steel rolling heating furnace oxygen-enriched systems, including heating furnace, control unit and oxygen-enriched regulating unit, the oxygen-enriched regulating unit includes primary regulating group, the primary regulating group includes the furnace temperature detection module for detecting the furnace temperature in the heating furnace, the furnace temperature detection module is located on the heating furnace;The primary regulating group further includes billet discharge temperature detection module for detecting billet discharge temperature, the billet discharge temperature detection module is located outside the heating furnace, at the furnace tail of the heating furnace.The utility model steel rolling heating furnace oxygen-enriched system, in addition to continuing the monitoring of furnace temperature and the conventional operation of adjusting oxygen amount according to furnace temperature, also introduce billet discharge temperature as another key reference element of oxygen amount regulation and control, integrate furnace temperature and billet discharge temperature, the temperature of two objects in the billet heat transfer process of the heating furnace is directly set as control basis, complete fine and accurate oxygen-enriched control.

Description

Technical Field

[0001] This utility model relates to the field of oxygen-enriched system technology, and in particular to an oxygen-enriched system for a steel rolling heating furnace. Background Technology

[0002] Oxygen-enriched and pure oxygen combustion technologies, as highly efficient energy-saving methods, have been widely applied in glass melting, copper smelting, and converter steelmaking, demonstrating significant energy-saving and emission-reduction effects in these fields. However, the application of oxygen-enriched combustion technology to heating furnaces is still in its initial stage in China. The application of this technology in heating furnaces offers the following advantages: it enhances the heating process, thereby effectively increasing the furnace's output and making production more flexible to better adapt to different production demands; it allows the furnace to use lower-calorific-value gas, further optimizing the energy medium configuration of the entire steel plant and improving energy utilization efficiency; it saves fuel consumption, helping to achieve carbon emission reduction targets in the furnace production process, aligning with current environmental trends; and it reduces emissions of pollutants such as nitrogen oxides (NOx), minimizing environmental pollution and providing significant environmental benefits.

[0003] Given these advantages, oxygen-enriched combustion technology has broad application prospects in the field of heating furnaces from a long-term development perspective. Currently, conventional oxygen-enriched systems for heating furnaces, as disclosed in Chinese patent applications 201910940430.4 and 201911049725.9, generally include a furnace temperature detection module, an oxygen concentration detection module, an oxygen flow detection module, and an oxygen pressure detection module. The oxygen concentration, flow, and pressure detection modules respectively detect oxygen concentration, flow rate, and pressure to achieve safe control of the oxygen-enriched system; the furnace temperature detection module monitors the furnace temperature and adjusts the oxygen supply accordingly. However, existing oxygen-enriched systems for heating furnaces are relatively simple, with basic control strategies, only achieving limited safety assurance and control functions. They cannot meet the precise, flexible, and safe modulation requirements of the oxygen-enriched combustion process under complex operating conditions, making it difficult to achieve accurate oxygen supply control. This, to some extent, affects the further improvement of oxygen-enriched combustion efficiency, the stability of heating furnace production, and the optimization of energy-saving and emission-reduction effects. Utility Model Content

[0004] The purpose of this invention is to provide an oxygen-enriched system for a steel rolling heating furnace.

[0005] The technical solution to achieve the purpose of this utility model is: an oxygen-enriched system for a steel rolling heating furnace, comprising a heating furnace, a control unit, and an oxygen-enriched regulating unit. The heating furnace has an inlet end (furnace head) and an outlet end (furnace tail) along its length. The heating furnace is connected to a chimney. Burners are installed inside the heating furnace and are connected to an oxygen pipeline located outside the heating furnace. An oxygen regulating valve is installed on the oxygen pipeline. The oxygen-enriched regulating unit includes a primary regulating group, which includes a furnace temperature detection module for detecting the furnace temperature inside the heating furnace, located on the heating furnace. The primary regulating group also includes a billet outlet temperature detection module for detecting the temperature of the billet exiting the furnace, located outside the heating furnace at the furnace tail. The furnace temperature detection module, the billet outlet temperature detection module, and the oxygen regulating valve are all communicatively connected to the control unit.

[0006] Furthermore, the number of furnace temperature detection modules is several, and these modules are arranged at intervals along the width of the heating furnace. The number of furnace temperature detection modules can be one or several. Compared to the former, when several furnace temperature detection modules are arranged at intervals along the width of the heating furnace, the oxygen regulating valve can be controlled not only based on the individual furnace temperature detected by each module to adjust the oxygen intake of the heating furnace, but also based on the temperature difference detected between adjacent modules. If the temperature difference detected between adjacent modules exceeds a set value, the control unit controls the oxygen regulating valve to reduce the oxygen intake, thereby reducing the temperature difference across the width and ensuring more uniform furnace temperature throughout the heating furnace. This configuration allows for more precise and accurate oxygen enrichment regulation of the heating furnace.

[0007] Furthermore, the number of billet exit temperature detection modules is several, and these modules are arranged along the length of the heating furnace. The number of billet exit temperature detection modules can be one or several. Compared to the former, when several billet exit temperature detection modules are arranged at intervals along the length of the heating furnace, oxygen enrichment can be adjusted not only based on the temperature of a single exiting billet detected by each module, but also based on the temperature difference between adjacent modules. If the temperature difference between adjacent modules exceeds a set value, the control unit controls the oxygen regulating valve to reduce the oxygen intake of the heating furnace, thereby controlling the temperature difference of the exiting billets and making the temperature more uniform across the billets. This configuration allows for more precise and accurate oxygen enrichment adjustment of the heating furnace.

[0008] Furthermore, the oxygen enrichment adjustment unit includes a secondary adjustment group, which includes a residual oxygen detection module for detecting the oxygen content in the furnace tail of the heating furnace. The residual oxygen detection module is located at the furnace tail and is communicatively connected to the control unit. The adjustment priority of the detection value of the secondary adjustment group is lower than that of the detection value of the primary adjustment group. During oxygen enrichment adjustment, regardless of whether the detection value of the secondary adjustment group is within the set range, if the detection value of the primary adjustment group is not within the set range, the control unit controls the oxygen regulating valve to adjust the oxygen intake of the heating furnace so that the detection value of the primary adjustment group is within the set range. After the detection value of the primary adjustment group is within the set range, if the detection value of the secondary adjustment group is not within the set range, the control unit controls the oxygen regulating valve to adjust the oxygen intake of the heating furnace so that the detection value of the secondary adjustment group is within the set range. The secondary adjustment group includes a residual oxygen detection module. During operation, the residual oxygen detection module detects the oxygen content in the furnace tail of the heating furnace in real time, and the control unit controls the oxygen regulating valve based on the detected oxygen content. The amount of oxygen in the furnace tail reflects the combustion situation and oxygen consumption during combustion. The aforementioned secondary adjustment group, while ensuring that the furnace temperature and the temperature of the billet exiting the furnace are within the set range and the furnace is operating normally, allows for more precise adjustment of the oxygen supply through the detection value of the residual oxygen detection module, thus achieving a more accurate oxygen supply.

[0009] Furthermore, the secondary adjustment group includes a nitrogen oxide detection module for detecting the amount of nitrogen oxides in the chimney of the heating furnace. The nitrogen oxide detection module is located inside the chimney and is communicatively connected to the control unit. During operation, the nitrogen oxide detection module monitors the amount of nitrogen oxides in the chimney of the heating furnace in real time. Based on the detected nitrogen oxide level, the control unit controls the oxygen regulating valve. The amount of nitrogen oxides in the chimney reflects the combustion status of the heating furnace. The aforementioned secondary adjustment group, while ensuring that the furnace temperature and the temperature of the billet exiting the furnace are within the set range and that the heating furnace is operating normally, allows for more precise adjustment of the oxygen supply through the detection value of the nitrogen oxide detection module, achieving a more accurate oxygen supply.

[0010] Furthermore, the secondary adjustment group includes an oxidation loss detection module for detecting the oxidation loss of the billet exiting the heating furnace. This oxidation loss detection module is communicatively connected to the control unit. During operation, the nitrogen oxide detection module monitors the oxidation loss of the billet exiting the heating furnace in real time. Based on this detected oxidation loss, the control unit controls the oxygen regulating valve. The oxidation loss of the billet reflects, to a certain extent, the heating status of the billet by the heating furnace. The aforementioned secondary adjustment group, while ensuring that the furnace temperature and the billet temperature remain within the set range and that the heating furnace operates normally, allows for more precise adjustment of the oxygen supply through the detection value from the oxidation loss detection module, achieving a more accurate oxygen supply.

[0011] Furthermore, an oxygen shut-off valve is installed on the oxygen pipeline. The oxygen-enriched system of the steel rolling furnace also includes a safety detection unit. This safety detection unit includes an oxygen pressure detection module for detecting the oxygen pressure in the oxygen pipeline and an oxygen flow detection module for detecting the oxygen flow rate in the oxygen pipeline. The oxygen pressure detection module and the oxygen flow detection module are both located on the oxygen pipeline. The oxygen pressure detection module, the oxygen flow detection module, and the oxygen shut-off valve are all communicatively connected to the control unit. During operation, the oxygen pressure detection module of the safety detection unit continuously monitors the oxygen pressure in the oxygen pipeline, and the oxygen flow detection module continuously monitors the oxygen flow rate in the oxygen pipeline. Based on the oxygen pressure and flow rate in the oxygen pipeline, the control unit controls the oxygen shut-off valve. The adjustment priority of the safety detection unit is higher than that of the oxygen enrichment adjustment unit. During production, regardless of whether the detection value of the oxygen enrichment adjustment unit is within the set range, if the oxygen pressure in the oxygen pipeline is greater than the high-pressure set value, or the oxygen pressure in the oxygen pipeline is less than the low-pressure set value, or the oxygen flow rate in the oxygen pipeline is greater than the set value, the control unit controls the oxygen shut-off valve to close, cutting off the oxygen supply to the heating furnace. The detection values ​​of the oxygen pressure detection module and the oxygen flow detection module reflect the furnace pressure and oxygen supply to a certain extent. When the furnace pressure and oxygen supply are not within the set range, closing the oxygen shut-off valve immediately can greatly ensure the production safety of the heating furnace.

[0012] Furthermore, the safety detection unit includes a pipeline temperature detection module for detecting the temperature of the oxygen pipeline. This module is located on the oxygen pipeline and is communicatively connected to the control unit. During operation, the pipeline temperature detection module monitors the temperature of the oxygen pipeline in real time. Based on this temperature, the control unit controls the oxygen shut-off valve. Specifically, during production, regardless of whether the detection value of the oxygen enrichment adjustment unit is within the set range, if the temperature on the oxygen pipeline exceeds the set value, the control unit controls the oxygen shut-off valve to close, cutting off the oxygen supply to the heating furnace. When the temperature on the oxygen pipeline is too high, it indicates that the flame from the heating furnace has reached the oxygen pipeline. In this dangerous situation, immediately closing the oxygen shut-off valve greatly ensures the safety of the heating furnace's production.

[0013] Furthermore, the safety detection unit includes an external oxygen concentration detection module for detecting the oxygen concentration in the local environment outside the oxygen pipeline. This external oxygen concentration detection module is located outside the oxygen pipeline and is communicatively connected to the control unit. The external oxygen concentration detection module is close to the oxygen pipeline. During operation, it continuously monitors the oxygen concentration in the local environment outside the oxygen pipeline. Based on this concentration, the control unit controls the oxygen shut-off valve. Specifically, during production, regardless of whether the detection value of the oxygen enrichment adjustment unit is within the set range, if the oxygen concentration in the local environment outside the oxygen pipeline exceeds the set value, the control unit controls the oxygen shut-off valve to close, cutting off the oxygen supply to the heating furnace. When the oxygen concentration in the local environment outside the oxygen pipeline is too high, it indicates a potential oxygen leak within the pipeline. In this dangerous situation, immediately closing the oxygen shut-off valve greatly ensures the safety of the heating furnace's production.

[0014] Furthermore, the safety detection unit includes a burner flame detection module for detecting the burner flame, which is mounted on the burner. During operation, the burner flame detection module monitors the burner flame in real time, and based on the flame condition, the control unit controls the oxygen shut-off valve. Specifically, during production, regardless of whether the detection value of the oxygen enrichment adjustment unit is within the set range, if the burner has no flame, the control unit controls the oxygen shut-off valve to close, cutting off the oxygen supply to the heating furnace. The absence of a flame in the burner indicates a possible burner malfunction; in this dangerous situation, immediately closing the oxygen shut-off valve greatly ensures the production safety of the heating furnace.

[0015] Furthermore, the control unit includes a PLC system and an oxygen controller connected via communication. The furnace temperature detection module and the billet tapping temperature detection module are respectively connected to the PLC system, and the oxygen shut-off valve and the oxygen regulating valve are respectively connected to the oxygen controller. The oxygen enrichment regulation unit includes a secondary regulation group. When the secondary regulation group includes a residual oxygen detection module, a nitrogen oxide detection module, and an oxidation loss detection module, each of these modules is connected to the PLC system. The oxygen enrichment system of the rolling mill heating furnace includes a safety detection unit. When the safety detection unit includes an oxygen pressure detection module, an oxygen flow detection module, a pipeline temperature detection module, an external oxygen concentration detection module, and a burner flame detection module, each of these modules is connected to the oxygen controller. The heating furnace is typically equipped with a corresponding PLC system. Based on this PLC system, an oxygen controller is installed to achieve oxygen enrichment control. This oxygen controller addresses two issues: firstly, it avoids directly connecting all detection values ​​to the PLC system, resolving the PLC system interface problem; secondly, modules detecting values ​​on the heating furnace are connected to the PLC system, while modules detecting values ​​in and near the oxygen pipeline are connected to the oxygen controller. The oxygen controller's location near the oxygen pipeline reduces the distance between the controller and the pipeline, resulting in a more rational control circuit layout.

[0016] This utility model relates to an oxygen-enriched system for a steel rolling furnace. The heating process of the steel billet by the furnace is a heat transfer process between the furnace and the billet. In this heat transfer relationship, the directly related objects are the furnace and the billet, with the furnace being the high-temperature object and the billet the low-temperature object. Correspondingly, the furnace temperature reflects the heating capacity of the furnace as a heat source and is the source of heat supply; the billet temperature reflects the actual heating result of the billet and is the final effect of heat transfer. For this heat transfer process from the furnace to the billet, traditional furnace control methods often focus on adjusting the oxygen regulating valve based on furnace temperature data to control the oxygen input. However, this utility model's oxygen-enriched system for a steel rolling furnace makes improvements and expansions. In addition to continuing the conventional operation of monitoring the furnace temperature and adjusting the oxygen intake based on the furnace temperature, it introduces the billet temperature as another key reference element for oxygen intake control, integrating the furnace temperature and the billet temperature, and directly setting the temperatures of the two objects in the heat transfer process between the furnace and the billet as the control basis.

[0017] This utility model's oxygen-enriched system for a steel rolling furnace combines furnace temperature and billet temperature, comprehensively covering both components in the entire heat transfer chain, from source to end, leaving no element unchecked. Real-time recording of data from both ends allows for real-time tracking of the dynamic heat transfer process, enabling precise and accurate oxygen enrichment control. If the furnace temperature is high while the billet temperature is low, it indicates significant potential for heat transfer. In this case, the oxygen intake can be appropriately increased to improve furnace combustion efficiency, accelerate heat release, and promote heat transfer to the billet. Conversely, if the billet temperature is already high, close to the target value, even with a slightly higher furnace temperature, the oxygen intake should be reduced to prevent overheating and avoid defects such as overheating or burning of the billet. This ensures the orderly and continuous nature of heat transfer, allowing heat to be accurately and promptly transferred to the billet for uniform heating.

[0018] Furthermore, by incorporating the billet temperature at the outlet, the system can sense the actual temperature of the downstream billets in real time. This real-time temperature guidance allows for more precise and accurate oxygen enrichment control, and also enables adaptation to more complex production conditions. For example, with the same furnace temperature, if the initial temperature of the raw billet is low or its size is large, the outlet billet temperature will decrease accordingly; conversely, if the initial temperature of the billet is high or its size is small, the outlet billet temperature will increase accordingly. In such cases, relying solely on the furnace temperature for oxygen control would be inaccurate. However, this novel oxygen-enriched heating furnace system, combined with the billet temperature at the outlet, can easily handle such complex situations. When the outlet billet temperature is detected to be low, the oxygen intake can be increased promptly to compensate for the heat, ensuring the billet is uniformly heated to the target temperature and maintaining production stability. When the outlet billet temperature is detected to be high, the oxygen intake can be reduced to avoid overheating, ensuring consistent product quality and reducing production interruptions or defective products caused by temperature fluctuations. This allows the entire steel rolling production process to proceed smoothly and orderly, creating stable economic benefits for the enterprise. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the oxygen-enriched system of the steel rolling heating furnace of this utility model; in the figure, double-sided arrows indicate furnace inlet and outlet. Figure 2 This is a control structure diagram of the oxygen-enriched system of the steel rolling heating furnace of this utility model. Detailed Implementation

[0020] The preferred embodiment of the oxygen-enriched system of the steel rolling furnace of this utility model is described in detail below with reference to the accompanying drawings.

[0021] like Figure 1 and Figure 2As shown, an oxygen-enriched system for a steel rolling mill heating furnace includes a heating furnace 1, a control unit 2, and an oxygen-enriched regulating unit 3. The heating furnace 1 has an inlet end (furnace head 11) and an outlet end (furnace tail 12) along its length. The heating furnace 1 is connected to a chimney 13. Burners 10 are installed inside the heating furnace 1 and are connected to an oxygen pipeline 20 located outside the heating furnace 1. An oxygen regulating valve 201 is installed on the oxygen pipeline 20. The oxygen-enriched regulating unit 3 includes a primary regulating group 31, which includes components for detecting… The furnace temperature detection module 311 for detecting the furnace temperature inside the heating furnace 1 is installed on the heating furnace 1; the primary adjustment group 31 also includes a billet exit temperature detection module 312 for detecting the temperature of the billet exiting the furnace, the billet exit temperature detection module 312 is installed outside the heating furnace 1, the billet exit temperature detection module 312 is located at the furnace tail 12 of the heating furnace 1; the furnace temperature detection module 311, the billet exit temperature detection module 312 and the oxygen regulating valve 201 are all communicatively connected to the control unit 2.

[0022] This utility model relates to an oxygen-enriched system for a steel rolling furnace. The steel billet enters through the furnace head 11 and exits through the furnace tail 12 of the furnace 1. During the process of the steel billet entering and exiting the furnace 1, oxygen is introduced into the oxygen pipeline 20. The introduced oxygen is then sprayed out by the burner 10 for combustion, thus burning and heating the steel billet entering the furnace 1.

[0023] The present invention relates to an oxygen-enriched system for a steel rolling heating furnace. The control unit 2 and the oxygen-enriched regulating unit 3 are combined to regulate the oxygen consumption of the heating furnace. The control unit 2 acts as the control center. In the oxygen-enriched regulating unit 3, the furnace temperature detection module 311 is used to detect the furnace temperature inside the heating furnace 1, and the billet exit temperature detection module 312 is used to detect the temperature of the billet exiting the furnace.

[0024] This utility model relates to an oxygen-enriched system for a steel rolling furnace. During the heating of the steel billet in the furnace 1, the furnace temperature detection module 311 monitors the furnace temperature in real time, and the billet exit temperature detection module 312 monitors the temperature of the exiting billet in real time. Both the furnace temperature detected by the furnace temperature detection module 311 and the billet exit temperature detected by the billet exit temperature detection module 312 are sent to the control unit 2. Based on the furnace temperature detected by the furnace temperature detection module 311 and the billet exit temperature detected by the billet exit temperature detection module 312, the control unit 2 adjusts the oxygen regulating valve 201. If either the furnace temperature detected by the furnace temperature detection module 311 or the billet exit temperature detected by the billet exit temperature detection module 312 is greater than the corresponding set value, the control unit 2 adjusts the oxygen regulating valve 201 to reduce the oxygen intake. If either the furnace temperature detected by the furnace temperature detection module 311 or the billet exit temperature detected by the billet exit temperature detection module 312 is less than the low-temperature set value, the control unit 2 adjusts the oxygen regulating valve 201 to increase the oxygen intake. If the furnace temperature is high and the billet temperature is low, the oxygen intake is appropriately increased; conversely, if the billet temperature is already high, close to the target value, while the furnace temperature is only slightly higher, the oxygen intake is reduced.

[0025] This utility model relates to an oxygen-enriched system for a steel rolling furnace. The heating process of the steel billet by the furnace 1 is a heat transfer process from the furnace 1 to the billet. In this heat transfer relationship, the directly related objects are the furnace 1 and the billet, with the furnace 1 being the high-temperature object and the billet being the low-temperature object. Correspondingly, the furnace temperature reflects the heating capacity of the furnace, which is the source of heat supply; the billet temperature reflects the actual heating result of the billet, which is the final effect of heat transfer. For this heat transfer process from the furnace 1 to the billet, traditional furnace control methods often focus on adjusting the oxygen regulating valve 201 based on furnace temperature data to control the oxygen input. However, the oxygen-enriched system of the steel rolling furnace of this utility model has been improved and expanded. In addition to continuing the conventional operation of monitoring the furnace temperature and adjusting the oxygen supply according to the furnace temperature, it also introduces the temperature of the billet exiting the furnace as another key reference factor for oxygen supply control. The furnace temperature and the billet exiting the furnace are integrated, and the temperature of the two objects in the heat transfer process of the heating furnace 1 to the billet is directly set as the basis for control.

[0026] This utility model's oxygen-enriched system for a steel rolling furnace combines furnace temperature and billet temperature, comprehensively covering both components in the entire heat transfer chain, from source to end, leaving no element unchecked. Real-time recording of data from both ends allows for real-time tracking of the dynamic heat transfer process, enabling precise and accurate oxygen enrichment control. If the furnace temperature is high while the billet temperature is low, it indicates significant potential for heat transfer. In this case, the oxygen intake can be appropriately increased to improve furnace combustion efficiency, accelerate heat release, and promote heat transfer to the billet. Conversely, if the billet temperature is already high, close to the target value, even with a slightly higher furnace temperature, the oxygen intake should be reduced to prevent overheating and avoid defects such as overheating or burning of the billet. This ensures the orderly and continuous nature of heat transfer, allowing heat to be accurately and promptly transferred to the billet for uniform heating.

[0027] Furthermore, by incorporating the billet temperature at the outlet, the system can sense the actual temperature of the downstream billets in real time. This real-time temperature guidance allows for more precise and accurate oxygen enrichment control, and also enables adaptation to more complex production conditions. For example, with the same furnace temperature, if the initial temperature of the raw billet is low or its size is large, the outlet billet temperature will decrease accordingly; conversely, if the initial temperature of the billet is high or its size is small, the outlet billet temperature will increase accordingly. In such cases, relying solely on the furnace temperature for oxygen control would be inaccurate. However, this novel oxygen-enriched heating furnace system, combined with the billet temperature at the outlet, can easily handle such complex situations. When the outlet billet temperature is detected to be low, the oxygen intake can be increased promptly to compensate for the heat, ensuring the billet is uniformly heated to the target temperature and maintaining production stability. When the outlet billet temperature is detected to be high, the oxygen intake can be reduced to avoid overheating, ensuring consistent product quality and reducing production interruptions or defective products caused by temperature fluctuations. This allows the entire steel rolling production process to proceed smoothly and orderly, creating stable economic benefits for the enterprise.

[0028] In this utility model, the oxygen-enriched system for a steel rolling furnace preferably includes several furnace temperature detection modules 311, which are arranged at intervals along the width of the furnace 1. The number of furnace temperature detection modules 311 can be one or several. Compared to the former, when several furnace temperature detection modules 311 are arranged at intervals along the width of the furnace 1, the oxygen regulating valve 201 can be controlled to adjust the oxygen intake of the furnace 1 based on the individual furnace temperature detected by each module 311. Furthermore, the oxygen regulating valve 201 can be controlled to adjust the oxygen intake of the furnace 1 based on the temperature difference detected between adjacent modules 311. If the temperature difference detected between adjacent modules 311 is greater than a set value, the control unit 2 controls the oxygen regulating valve 201 to reduce the oxygen intake of the furnace 1, thereby reducing the temperature difference along the width and ensuring a more uniform furnace temperature throughout the furnace 1. This setting allows for more precise and accurate oxygen enrichment regulation of the heating furnace.

[0029] In this utility model, the oxygen-enriched system for a steel rolling furnace preferably includes several billet exit temperature detection modules 312, arranged along the length of the furnace 1. The number of billet exit temperature detection modules 312 can be one or several. Compared to the former, when several billet exit temperature detection modules 312 are arranged at intervals along the length of the furnace 1, oxygen enrichment can be adjusted not only based on the temperature of a single exiting billet detected by the module 312, but also based on the temperature difference between adjacent modules. For example, if the temperature difference between adjacent modules exceeds a set value, the control unit 2 controls the oxygen regulating valve 201 to reduce the oxygen intake of the furnace 1, thereby controlling the temperature difference of the exiting billets and making the temperature of the exiting billets more uniform. This setting allows for more precise and accurate oxygen enrichment regulation of the heating furnace.

[0030] In a preferred embodiment of the oxygen-enriched system for a steel rolling furnace, the oxygen-enriched regulating unit 3 includes a secondary regulating group 32. The secondary regulating group 32 includes a residual oxygen detection module 321 for detecting the oxygen content in the furnace tail 12 of the furnace 1. The residual oxygen detection module 321 is located at the furnace tail 12 of the furnace 1 and is communicatively connected to the control unit 2. The regulation priority of the detection value of the secondary regulating group 32 is lower than that of the detection value of the primary regulating group 31. During oxygen enrichment regulation, regardless of whether the detection value of the secondary regulating group 32 is within the set range, if the detection value of the primary regulating group 31 is not within the set range, the control unit 2 controls the oxygen regulating valve 201 to adjust the oxygen intake of the furnace 1 so that the detection value of the primary regulating group 31 is within the set range. After the detection value of the primary adjustment group 31 is within the set range, if the detection value of the secondary adjustment group 32 is not within the set range, the control unit 2 controls the oxygen regulating valve 201 to adjust the oxygen intake of the heating furnace 1 so that the detection value of the secondary adjustment group 32 is within the set range. The secondary adjustment group 32 includes a residual oxygen detection module 321. During operation, the residual oxygen detection module 321 detects the amount of oxygen in the furnace tail 12 of the heating furnace 1 in real time. Based on the detected oxygen amount, the control unit 2 controls the oxygen regulating valve 201. The amount of oxygen in the furnace tail 12 of the heating furnace 1 reflects the combustion situation in the heating furnace and the amount of oxygen consumed during combustion. The setting of the aforementioned secondary adjustment group 32, while ensuring that the furnace temperature and the temperature of the billet exiting the furnace are within the set range and that the heating furnace is operating normally, allows for more precise adjustment of the oxygen intake through the detection value of the residual oxygen detection module 321, achieving a more accurate oxygen supply.

[0031] The present invention relates to an oxygen-enriched system for a steel rolling furnace. Preferably, the secondary regulating group 32 includes a nitrogen oxide detection module 322 for detecting the amount of nitrogen oxides in the chimney 13 of the furnace 1. The nitrogen oxide detection module 322 is located inside the chimney 13 of the furnace 1 and is communicatively connected to the control unit 2. During operation, the nitrogen oxide detection module 322 detects the amount of nitrogen oxides in the chimney 13 of the furnace 1 in real time. Based on the detected amount of nitrogen oxides, the control unit 2 controls the oxygen regulating valve 201. The amount of nitrogen oxides in the chimney 13 reflects the combustion status of the furnace. The aforementioned secondary regulating group 32, while ensuring that the furnace temperature and the temperature of the billet exiting the furnace are within the set range and that the furnace is operating normally, allows for more precise adjustment of the oxygen supply through the detection value of the nitrogen oxide detection module 322, achieving a more accurate oxygen supply.

[0032] The oxygen-enriched system for a steel rolling furnace of this invention preferably includes a secondary adjustment group 32 comprising an oxidation loss detection module 323 for detecting the oxidation loss of the steel billet exiting the furnace 1. The oxidation loss detection module 323 is communicatively connected to the control unit 2. During operation, the nitrogen oxide detection module 322 detects the oxidation loss of the steel billet exiting the furnace 1 in real time. Based on the detected oxidation loss, the control unit 2 controls the oxygen regulating valve 201. The oxidation loss of the steel billet reflects, to a certain extent, the heating status of the billet by the furnace. The aforementioned secondary adjustment group 32, while ensuring that the furnace temperature and the temperature of the exiting steel billet are within the set range and that the furnace is operating normally, allows for more precise adjustment of the oxygen supply through the detection value of the oxidation loss detection module 323, achieving a more accurate oxygen supply.

[0033] Preferably, in the oxygen-enriched system of the steel rolling furnace of this utility model, an oxygen shut-off valve 202 is installed on the oxygen pipeline 20. The oxygen-enriched system of the steel rolling furnace also includes a safety detection unit 4. The safety detection unit 4 includes an oxygen pressure detection module 41 for detecting the oxygen pressure in the oxygen pipeline 20 and an oxygen flow detection module 42 for detecting the oxygen flow rate in the oxygen pipeline 20. The oxygen pressure detection module 41 and the oxygen flow detection module 42 are located on the oxygen pipeline 20. The oxygen pressure detection module 41, the oxygen flow detection module 42, and the oxygen shut-off valve 202 are all communicatively connected to the control unit 2. During operation, the oxygen pressure detection module 41 of the safety detection unit 4 detects the oxygen pressure in the oxygen pipeline 20 in real time, and the oxygen flow detection module 42 detects the oxygen flow rate in the oxygen pipeline 20 in real time. Based on the oxygen pressure and oxygen flow rate in the oxygen pipeline 20, the control unit 2 controls the oxygen shut-off valve 202. The adjustment priority of the detection value of the safety detection unit 4 is higher than that of the detection value of the oxygen enrichment adjustment unit 3. During production, regardless of whether the detection value of the oxygen enrichment adjustment unit 3 is within the set range, as long as the oxygen pressure in the oxygen pipeline 20 is greater than the high-pressure set value, or the oxygen pressure in the oxygen pipeline 20 is less than the low-pressure set value, or the oxygen flow rate in the oxygen pipeline 20 is greater than the set value, the control unit 2 controls the oxygen shut-off valve 202 to close, cutting off the oxygen supply to the heating furnace. The detection values ​​of the oxygen pressure detection module 41 and the oxygen flow detection module 42 reflect the furnace pressure and oxygen supply of the heating furnace to a certain extent. When the furnace pressure and oxygen supply of the heating furnace are not within the set range, closing the oxygen shut-off valve 202 immediately can greatly ensure the production safety of the heating furnace.

[0034] In a preferred embodiment of the oxygen-enriched system for a steel rolling furnace, the safety detection unit 4 includes a pipeline temperature detection module 43 for detecting the temperature of the oxygen pipeline 20. The pipeline temperature detection module 43 is mounted on the oxygen pipeline 20 and is communicatively connected to the control unit 2. During operation, the pipeline temperature detection module 43 monitors the temperature of the oxygen pipeline 20 in real time. Based on the temperature of the oxygen pipeline 20, the control unit 2 controls the oxygen shut-off valve 202. Specifically, during production, regardless of whether the detection value of the oxygen enrichment regulating unit 3 is within the set range, if the temperature of the oxygen pipeline 20 exceeds the set value, the control unit 2 controls the oxygen shut-off valve 202 to close, cutting off the oxygen supply to the furnace. When the temperature of the oxygen pipeline 20 is too high, it indicates that the furnace flame has reached the oxygen pipeline 20. In this dangerous situation, immediately closing the oxygen shut-off valve 202 greatly ensures the production safety of the furnace.

[0035] In a preferred embodiment of the oxygen enrichment system for a steel rolling furnace, the safety detection unit 4 includes an external oxygen concentration detection module 44 for detecting the oxygen concentration in the local environment outside the oxygen pipeline 20. The external oxygen concentration detection module 44 is located outside the oxygen pipeline 20 and is communicatively connected to the control unit 2. The external oxygen concentration detection module 44 is close to the oxygen pipeline 20. During operation, the external oxygen concentration detection module 44 continuously monitors the oxygen concentration in the local environment outside the oxygen pipeline 20. Based on the oxygen concentration in the local environment outside the oxygen pipeline 20, the control unit 2 controls the oxygen shut-off valve 202. Specifically, during production, regardless of whether the detection value of the oxygen enrichment adjustment unit 3 is within the set range, if the oxygen concentration in the local environment outside the oxygen pipeline 20 is greater than the set value, the control unit 2 controls the oxygen shut-off valve 202 to close, cutting off the oxygen supply to the furnace. When the oxygen concentration in the local environment outside the oxygen pipeline 20 is too high, it indicates to some extent that there is a possibility of oxygen leakage inside the oxygen pipeline 20. In this dangerous situation, closing the oxygen shut-off valve 202 immediately can greatly ensure the production safety of the heating furnace.

[0036] In a preferred embodiment of the oxygen-enriched system for a steel rolling furnace, the safety detection unit 4 includes a burner flame detection module 45 for detecting the flame of the burner 10, which is mounted on the burner 10. During operation, the burner flame detection module 45 monitors the flame of the burner 10 in real time. Based on the flame condition of the burner 10, the control unit 2 controls the oxygen shut-off valve 202. Specifically, during production, regardless of whether the detection value of the oxygen enrichment adjustment unit 3 is within the set range, if the burner 10 has no flame, the control unit 2 controls the oxygen shut-off valve 202 to close, cutting off the oxygen supply to the furnace. The absence of a flame in the burner 10 indicates a possible malfunction. In this dangerous situation, immediately closing the oxygen shut-off valve 202 greatly ensures the production safety of the furnace.

[0037] In a preferred embodiment of the oxygen-enriched system for a steel rolling furnace, the control unit 2 includes a PLC system 21 and an oxygen controller 22 connected via communication. The furnace temperature detection module 311 and the billet tapping temperature detection module 312 are respectively connected to the PLC system 21. The oxygen shut-off valve 202 and the oxygen regulating valve 201 are respectively connected to the oxygen controller 22. The oxygen-enriched regulating unit 3 includes a secondary regulating group 32. When the secondary regulating group 32 includes a residual oxygen detection module 321, a nitrogen oxide detection module 322, and an oxidation loss detection module 323, all three modules are respectively connected to the PLC system 21 via communication. The oxygen-enriched system of the steel rolling furnace includes a safety detection unit 4. When the safety detection unit 4 includes an oxygen pressure detection module 41, an oxygen flow detection module 42, a pipeline temperature detection module 43, an external oxygen concentration detection module 44, and a burner flame detection module 45, the oxygen pressure detection module 41, the oxygen flow detection module 42, the pipeline temperature detection module 43, the external oxygen concentration detection module 44, and the burner flame detection module 45 are all communicatively connected to the oxygen controller 22. The heating furnace 1 is typically equipped with a corresponding PLC system 21. Based on the PLC system 21, an oxygen controller 22 is set up to achieve oxygen enrichment control. After setting up the oxygen controller 22, on the one hand, it can avoid all detection values ​​being directly connected to the PLC system 21, thus solving the interface problem of the PLC system 21; on the other hand, the module that detects the values ​​on the heating furnace 1 is connected to the PLC system 21, and the module that detects the values ​​on and near the oxygen pipeline 20 is connected to the oxygen controller 22. The oxygen controller 22 is located near the oxygen pipeline 20, which can reduce the distance from the line and make the control line layout more reasonable.

[0038] This utility model relates to an oxygen-enriched system for a steel rolling furnace. The furnace temperature detection module 311, the billet tapping temperature detection module 312, the pipeline temperature detection module 43, and the burner flame detection module 45 are all temperature sensors; the residual oxygen detection module 321 and the external oxygen concentration detection module 44 are both oxygen concentration sensors; the nitrogen oxide detection module 322 is a nitrogen oxide detection sensor; the oxidation loss detection module 323 is a weighing device; the oxygen pressure detection module 41 is a pressure sensor; and the oxygen flow detection module 42 is a flow sensor. The temperature sensors, oxygen concentration sensors, nitrogen oxide detection sensors, weighing devices, pressure sensors, flow sensors, PLC systems, and oxygen controllers are all existing structures, and will not be elaborated upon further in this utility model.

[0039] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent process transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An oxygen-enriched system for a steel rolling mill heating furnace, comprising a heating furnace, a control unit, and an oxygen-enriched regulating unit, wherein the heating furnace has an inlet end (furnace head) and an outlet end (furnace tail) along its length, a chimney is connected to the heating furnace, burners are installed inside the heating furnace and connected to an oxygen pipeline located outside the heating furnace, an oxygen regulating valve is installed on the oxygen pipeline, and the oxygen-enriched regulating unit includes a primary regulating group, the primary regulating group including a furnace temperature detection module for detecting the furnace temperature inside the heating furnace, the furnace temperature detection module being mounted on the heating furnace; characterized in that: The primary adjustment group also includes a billet exit temperature detection module for detecting the temperature of the billet exiting the furnace. The billet exit temperature detection module is located outside the heating furnace and at the tail of the furnace. The furnace temperature detection module, the billet exit temperature detection module, and the oxygen regulating valve are all communicatively connected to the control unit.

2. The oxygen-enriched system for a steel rolling furnace according to claim 1, characterized in that: The number of furnace temperature detection modules is several, and the several furnace temperature detection modules are arranged at intervals along the width direction of the heating furnace.

3. The oxygen-enriched system for a steel rolling furnace according to claim 1, characterized in that: The number of billet exit temperature detection modules is several, and the several billet exit temperature detection modules are arranged along the length of the heating furnace.

4. The oxygen-enriched system for a steel rolling furnace according to claim 1, characterized in that: The oxygen enrichment adjustment unit includes a secondary adjustment group, which includes a residual oxygen detection module for detecting the amount of oxygen in the furnace tail of the heating furnace. The residual oxygen detection module is located at the furnace tail of the heating furnace and is communicatively connected to the control unit.

5. The oxygen-enriched system for a steel rolling furnace according to claim 4, characterized in that: The secondary adjustment group includes a nitrogen oxide detection module for detecting the amount of nitrogen oxides in the chimney of the heating furnace. The nitrogen oxide detection module is located inside the chimney of the heating furnace and is communicatively connected to the control unit.

6. The oxygen-enriched system for a steel rolling furnace according to claim 4, characterized in that: The secondary adjustment group includes an oxidation loss detection module for detecting the oxidation loss of the steel billet exiting the heating furnace, and the oxidation loss detection module is communicatively connected to the control unit.

7. The oxygen-enriched system for a steel rolling furnace according to claim 1, characterized in that: An oxygen shut-off valve is installed on the oxygen pipeline. The oxygen-enriched system of the steel rolling furnace also includes a safety detection unit. The safety detection unit includes an oxygen pressure detection module for detecting the oxygen pressure in the oxygen pipeline and an oxygen flow detection module for detecting the oxygen flow rate in the oxygen pipeline. The oxygen pressure detection module is located on the oxygen pipeline, and the oxygen flow detection module is located on the oxygen pipeline. The oxygen pressure detection module, the oxygen flow detection module, and the oxygen shut-off valve are all communicatively connected to the control unit.

8. The oxygen-enriched system for a steel rolling furnace according to claim 7, characterized in that: The safety detection unit includes a pipeline temperature detection module for detecting the temperature of the oxygen pipeline. The pipeline temperature detection module is located on the oxygen pipeline and is communicatively connected to the control unit.

9. The oxygen-enriched system for a steel rolling furnace according to claim 7, characterized in that: The safety detection unit includes an external oxygen concentration detection module for detecting the local ambient oxygen concentration outside the oxygen pipeline. The external oxygen concentration detection module is located outside the oxygen pipeline and is communicatively connected to the control unit.

10. The oxygen-enriched system for a steel rolling furnace according to claim 7, characterized in that: The safety detection unit includes a burner flame detection module for detecting the burner flame, and the burner flame detection module is disposed on the burner.

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