Multi-kiln air supply system and control method

Abstract

The invention discloses a multi-furnace air supply system and a control method, and relates to the technical field of metallurgical equipment, and the multi-furnace smelting air supply system comprises an air supply pipeline, a backflow pipeline and a compensation pipeline. In the using process, by controlling connection / disconnection and circulation amount of the air supply pipeline, the backflow pipeline and the compensation pipeline, two air supply devices operate to supply air to one Isa furnace and any two converters, and compared with the mode that three air supply devices operate at the same time, the production requirement is met, meanwhile, electric energy can be saved, and waste of resources can be reduced.

Description

Technical Field

[0001] This application relates to the field of metallurgical equipment technology, and in particular to a multi-furnace air supply system and control method. Background Technology

[0002] ISASMELT technology has been widely used globally since the 1990s, processing approximately four million tons of concentrate and secondary raw materials annually. This technology is a submersible lance smelting technology.

[0003] The Yunnan Central Nonferrous Metals Group's pyrometallurgical copper smelting system consists of one Isa furnace and three converters. During production, the Isa furnace smelts the raw ore, and the resulting matte is then refined in the converters. In this process, one GM blower supplies air to one Isa furnace, and two GM blowers simultaneously supply air to all three converters. All three GM blowers are GM65H-3 centrifugal blowers with a supply air volume of 30,000 Nm³ / h. However, the normal operating air volume for the Isa furnace is less than 8,000 Nm³ / h, and for the converters it is less than 22,000 Nm³ / h. The GM65H-3 centrifugal blowers are driven by 1800KW industrial frequency motors and do not have the function of adjusting the motor speed to control the air supply volume.

[0004] However, in actual production, two converters are often used, and the compressed air generated by the simultaneous operation of three blowers far exceeds the air volume required for the production of one ISA furnace and two converters. The excess air is vented through the ISA furnace and the individual silencers of each converter, resulting in resource waste. Therefore, this application proposes a multi-furnace air supply system and control method that enables two blowers to supply air to one ISA furnace and any two converters, reducing resource waste. Summary of the Invention

[0005] The main purpose of this application is to provide a multi-furnace air supply system and control method, which aims to solve the technical problem of excessive resource waste when three air supply devices are operating simultaneously.

[0006] To achieve the above objectives, this application provides the following technical solution: A multi-furnace smelting air supply system includes air supply fan I, air supply fan II, air supply fan III, an Isa furnace, converter I, converter II, and converter III; wherein, it further includes: The air supply pipeline includes main pipes I, II, III, and IV, whose output ends are respectively connected to the Isa furnace, converter I, converter II, and converter III. The input ends of main pipes I, II, and III are respectively connected to air supply fans I, II, and III. The interior of main pipes I, II, and III near their input ends is connected to one end of branch pipes I, II, and III, respectively. The other ends of branch pipes I, II, and III are interconnected. The interior of main pipes II and III near their output ends is connected to one end of branch pipes IV and V, respectively. A return line is used to supply excess air destined for the Isa furnace to any of the converters. Compensation piping is used to compensate for the required air volume of the converter associated with the Isa furnace; The on / off state and flow rate of each pipe in the air supply pipeline, return pipeline and compensation pipeline are changed respectively, so that the two air supply devices can supply air to the Isa furnace and any two of converter I, converter II and converter III.

[0007] As a further improvement of this application, the main pipe I is provided with a gate valve I on the side of the branch pipe I near its input end, and a regulating valve I is provided on the main pipe I near its output end; the main pipe II is provided with a regulating valve II between the branch pipes II and IV it connects to, and the output end of the main pipe II is provided with a gate valve II and a regulating valve III; the main pipe III is provided with a regulating valve IV between the branch pipes III and V it connects to, and the output end of the main pipe III is provided with a gate valve III and a regulating valve V; the output end of the main pipe IV is provided with a regulating valve VI; the branch pipe I is provided with a gate valve IV, the branch pipe II is provided with a gate valve V, the branch pipe III is provided with a gate valve VI, the branch pipe IV is provided with a gate valve VII, and the branch pipe VIII is provided with a gate valve VIII; the opening / closing of each gate valve and the opening degree of each regulating valve are controlled respectively to change the on / off state and flow rate of each main pipe or branch pipe.

[0008] As a further improvement of this application, the return pipeline includes a connecting pipe I that is connected to the main pipe II and the main pipe III respectively. One end of the connecting pipe I is located between the regulating valve I and the branch pipe IV, and the other end of the connecting pipe I is located between the regulating valve IV and the branch pipe V. The end of the branch pipe I located on the side of the gate valve IV adjacent to the main pipe I is connected to one end of each of the two return pipes. The other ends of the two return pipes are connected to the middle of the connecting pipe I. The ends of the connecting pipe I located on opposite sides of the two return pipes are respectively provided with a gate valve IX and a regulating valve VII. Each of the two return pipes is provided with a regulating valve VIII so that excess airflow in the main pipe I is transferred to the interior of the main pipe II or the main pipe III.

[0009] As a further improvement of this application, the compensation pipeline is provided with a connecting pipe II that is connected to the main pipe II and the main pipe III respectively. One end of the connecting pipe II is located between the connecting pipe I and the branch pipe IV, and the other end of the connecting pipe II is located between the connecting pipe I and the branch pipe V. The connecting pipe II is provided with a regulating valve IX, and a gate valve X is provided on each side of the regulating valve IX. The opening and closing of the connecting pipe II is controlled by the two gate valves X, and the flow rate of the connecting pipe II is controlled by the regulating valve IX, so as to compensate for the required air volume of the converter associated with the blower I.

[0010] As a further improvement of this application, the air supply pipeline further includes flow meters I, II, and III respectively located at the input ends of the main pipe I, the main pipe II, and the main pipe III, and flow meters IV, V, VI, and VII respectively located at the output ends of the main pipe I, the main pipe II, the main pipe III, and the main pipe IV, so as to detect the gas flow rate at the input ends of the main pipe I, the main pipe II, and the main pipe III, and the gas flow rate at the output ends of the main pipe I, the main pipe II, the main pipe III, and the main pipe IV.

[0011] A control method for a multi-furnace kiln air supply system, applied to a multi-furnace kiln air supply system, the control method comprising: Step S1: Drive the blower I to operate, control and change the on / off state of the main pipe I, so that the path of the blower I to the Isa furnace is open, and at the same time adjust the opening of the output end of the main pipe I to keep the air supply pressure at the input end of the converter at the first preset value. Step S2: Based on step S1, control the opening / closing and flow rate of the return pipeline, and control the opening / closing of main pipe II, main pipe III, main pipe IV, branch pipe IV and branch pipe V to make the path of the blower I to the Isa furnace and the path to the converter I, converter II or converter III open. Step S3: Based on step S2, drive the air supply fan II or the air supply fan III to perform work, control and change the on / off state of the main pipe II, the main pipe III, the main pipe IV, the branch pipe IV and the branch pipe V, so that the path of air supply fan II or the air supply fan III to converter I, converter II or converter III is open, and adjust the opening degree of the main pipe II, the main pipe III or the main pipe IV so that the air supply pressure at the input end of the two converters is maintained at the second preset value; Step S4: Based on step S3, control the opening / closing and flow rate of the compensation pipeline to compensate the excess air volume generated by the blower II or the blower III to the converter associated with the Isa furnace.

[0012] As a further improvement of this application, the first preset value is [0.08MPa, 0.095MPa], and the second preset value is [0.08MPa-0.115MPa].

[0013] The technical solution provided in this application may include the following beneficial effects: During use, this application controls the on / off state and flow rate of each pipe in the air supply pipeline, return pipeline, and compensation pipeline to enable two air supply devices to supply air to one Isa furnace and any two converters. Compared to the simultaneous operation of three air supply devices, this method can save electricity and reduce resource waste while meeting production requirements. Attached Figure Description

[0014] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0015] Figure 1 This is a schematic diagram of the air supply system for a multi-furnace smelting process; Figure label: 1. Main pipe I; 2. Main pipe II; 3. Main pipe III; 4. Main pipe IV; 5. Branch pipe I; 6. Branch pipe II; 7. Branch pipe III; 8. Branch pipe IV; 9. Branch pipe V; 10. Gate valve I; 11. Gate valve II; 12. Gate valve III; 13. Gate valve IV; 14. Gate valve V; 15. Gate valve VI; 16. Gate valve VII; 17. Gate valve VIII; 18. Control valve I; 19. Control valve II; 20. Control valve III; 21. 21. Control valve IV; 22. Control valve V; 23. Control valve VI; 24. Connecting pipe I; 25. Return pipe; 26. Gate valve IX; 27. Control valve VII; 28. Control valve VIII; 29. ​​Connecting pipe II; 30. Gate valve X; 31. Control valve IX; 32. Flow meter I; 33. Flow meter II; 34. Flow meter III; 35. Flow meter IV; 36. Flow meter V; 37. Flow meter VI; 38. Flow meter VII. Detailed Implementation

[0016] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0017] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0018] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application as appropriate to the specific circumstances.

[0019] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0020] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0021] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

[0022] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0023] Example 1 Figure 1 An embodiment of the air supply system for multi-furnace smelting according to this application is shown; see [link to relevant documentation]. Figure 1 In this embodiment, the air supply system for multi-furnace smelting includes: air supply fan I, air supply fan II, air supply fan III, Isa furnace, converter I, converter II and converter III; in particular, the air supply system for multi-furnace smelting also includes air supply pipelines.

[0024] Among them, see Figure 1 The air supply pipeline includes main pipe I1, main pipe II2, main pipe III3, main pipe IV4, branch pipe I5, branch pipe II6, branch pipe III7, branch pipe IV8, and branch pipe V9. The output ends of air supply fan I, air supply fan II, and air supply fan III are connected to the input ends of main pipe I1, main pipe II2, and main pipe III3, respectively. The positions of main pipe I1, main pipe II2, and main pipe III3 near their input ends are connected to one end of branch pipe I5, branch pipe II6, and branch pipe III7, respectively. The other ends of branch pipe I5, branch pipe II6, and branch pipe III7 are connected together and interconnected. The positions of main pipe II2 and main pipe III3 near their output ends are connected to one end of branch pipe IV8 and branch pipe V9, respectively. The other ends of branch pipe IV8 and branch pipe V9 are both connected to the input end of main pipe IV4. The output ends of main pipe I1, main pipe II2, main pipe III3, and main pipe IV4 are connected to the input ends of Isa furnace, converter I, converter II, and converter III, respectively.

[0025] Further, see Figure 1The air supply pipeline also includes gate valves I10, II11, III12, IV13, V14, VI15, VII16, VIII17, regulating valve I18, regulating valve II19, regulating valve III20, regulating valve IV21, regulating valve V22, and regulating valve VI23. Gate valve I10 and regulating valve I18 are respectively located at the input and output ends of the main pipe I1. Closing gate valve I10 can prevent the airflow in the air supply pipeline from flowing to the air supply fan I. Changing the opening of regulating valve I18 can regulate the airflow. The air volume supplied to the Isa furnace; regulating valve II19 is located on the main pipe II2, between branch pipes II6 and IV8 connected to the main pipe II2. Changing the opening of regulating valve II19 changes the air volume flowing to the middle of the main pipe II2; gate valve II11 and regulating valve III20 are both located at the output end of the main pipe II2. Gate valve II11 can be closed when converter I is not in use. Changing the opening of regulating valve III20 changes the air volume flowing to converter I; regulating valve IV21 is located on the main pipe III3, between branch pipe III and branch pipe III connected to the main pipe III3. The positions between V9 and Ⅴ9 allow for adjustments to the opening of regulating valve Ⅳ21, which alters the airflow towards the middle of main pipe Ⅲ3. Gate valve Ⅲ12 and regulating valve Ⅴ22 are both located at the output end of main pipe Ⅱ2. Gate valve Ⅲ12 can be closed when converter Ⅱ is not in use, and adjusting the opening of regulating valve Ⅴ22 changes the airflow towards converter Ⅱ. Gate valve Ⅳ13 is located on branch pipe Ⅰ5, gate valve Ⅴ14 on branch pipe Ⅱ6, and gate valve Ⅵ15 on branch pipe Ⅲ7. Controlling the opening / closing of gate valves Ⅴ14 and Ⅵ15 respectively allows for adjustments to the airflow within main pipe Ⅰ1. Airflow is directed to main pipe II2 or main pipe III3, and the airflow from main pipe II2 or main pipe III3 is directed to main pipe I1; gate valve VII16 is located on branch pipe IV8, and gate valve VIII17 is located on branch pipe V9, which respectively control the opening / closing of gate valve VII16 and gate valve VIII17, allowing / preventing the airflow in main pipe II2 or main pipe III3 to the converter III; regulating valve VI23 is located at the output end of main pipe IV4, and changing the opening degree of regulating valve VI23 can change the airflow to the converter III; thereby regulating the on / off or throughput of each main pipe and each branch pipe.

[0026] Further, see Figure 1The multi-furnace air supply system also includes a return pipeline, which includes connecting pipe I 24, return pipe 25, gate valve IX 26, regulating valve VII 27, and regulating valve VIII 28. One end of connecting pipe I 24 is connected to the portion of main pipe II 2 located between regulating valve I 18 and branch pipe IV 8. The other end of connecting pipe I 24 is connected to the portion of main pipe III 3 located between regulating valve IV 21 and branch pipe V 9. Branch pipe I 5 is located on the side of gate valve IV 13 adjacent to main pipe I 1 and is connected to one of each of the two return pipes 25. The two return pipes 25 are connected at the other end to the middle of the connecting pipe I 24. The connecting pipe I 24 is located on the two sides of the two return pipes 25 that are far apart from each other, and gate valve IX 26 and regulating valve VII 27 are respectively installed. Each of the two return pipes 25 is equipped with a regulating valve VIII 28. By controlling the opening of regulating valve VII 27 and the two regulating valves VIII 28, the gas pressure in the main pipe I 1 is made to meet the air supply pressure of the Isa furnace, and at the same time, the excess airflow is made to flow quickly into the main pipe II 2 or the main pipe III 3.

[0027] Further, see Figure 1 The multi-furnace air supply system also includes a compensation pipeline, which includes a connecting pipe II 29, a gate valve X 30, and a regulating valve IX 31. One end of the connecting pipe II 29 is connected to the part of the main pipe II 2 located between the connecting pipe I 24 and the branch pipe IV 8, and the other end of the connecting pipe II 29 is connected to the part of the main pipe III 3 located between the connecting pipe I 24 and the branch pipe V 9. A gate valve X 30 is installed at each end of the connecting pipe II 29, and a regulating valve IX 31 is installed in the middle of the connecting pipe II 29. By controlling the opening of the regulating valve IX 31, the air pressure in the main pipe II 2 and the main pipe III 3 can be made to approach equilibrium so that the air volume output to any two converters is balanced.

[0028] Further, see Figure 1 The air supply duct also includes flow meters I32, II33, and III34, respectively, located at the input ends of main pipe I1, main pipe II2, and main pipe III3; and flow meters IV35, V36, VI37, and VII38, respectively, located at the output ends of main pipe I1, main pipe II2, main pipe III3, and main pipe IV4. Flow meters I, II33, and III34 are used to detect the air volume per unit time at the input ends of main pipe I1, main pipe II2, and main pipe III3 in real time to determine whether the corresponding air supply fans are operating normally. Flow meters IV35, V36, VI37, and VII38 are used to detect the air volume per unit time at the output ends of main pipe I1, main pipe II2, main pipe III3, and main pipe IV4 in real time to ensure that the air volume delivered to the ISA furnace or converter meets the requirements.

[0029] Optionally, regulating valve I18, regulating valve II19, regulating valve IV21 and regulating valve VII27 are butterfly valves; regulating valve III20, regulating valve V22, regulating valve VI23 and regulating valve VII27 are pneumatic butterfly valves; and regulating valve VIII28 and regulating valve IX31 are electric butterfly valves.

[0030] It should be noted that each gate valve is initially closed, and each regulating valve is initially open to zero.

[0031] In this embodiment, the opening and closing of each gate valve is controlled to control the on / off state of each main pipe and each branch pipe, and the flow rate of each main pipe and each branch pipe is controlled by changing the opening degree of each regulating valve. This enables two air supply devices to operate and supply air to one Isa furnace and any two converters. Compared with three air supply devices operating at the same time, this method can save electricity and reduce the waste of resources while meeting production requirements.

[0032] Example 2 To enable any two blowers to supply air to one Isa furnace and any two converters, based on the above embodiments, this embodiment provides a control method for a multi-furnace kiln air supply system. This control method includes the following steps: Step S1: Drive the blower I to operate, control the on / off state of the main pipe I1 to make the path of the blower I to the Isa furnace open, and at the same time adjust the opening of the output end of the main pipe I1 to keep the air supply pressure at the input end of the converter at the first preset value. Step S2: Based on step S1, control the opening / closing of the return pipeline and the flow rate, and control the opening / closing of main pipe II2, main pipe III3, main pipe IV4, branch pipe IV8 and branch pipe V9 to make the path of blower I to the Isa furnace, and the path of flow to converter I, converter II or converter III open. Step S3: Based on step S2, drive blower II or blower III to do work, control and change the on / off state of main pipe II2, main pipe III3, main pipe IV4, branch pipe IV8 and branch pipe V9, so that the path of blower II or blower III to converter I, converter II or converter III is open, and adjust the opening of main pipe II2, main pipe III3 or main pipe IV4 to keep the air supply pressure at the input end of the two converters at the second preset value. Step S4: Based on step S3, control the opening / closing and flow rate of the compensation pipeline to compensate the excess air volume generated by blower II or blower III to the converter associated with the Isa furnace.

[0033] Furthermore, the first preset value is [0.08MPa, 0.095MPa], and the second preset value is [0.08MPa-0.115MPa].

[0034] Optionally, the three blowers are blower I, blower II and blower III, respectively, and are connected to the input terminals of main pipe I1, main pipe II2 and main pipe III3, respectively; the three converters are converter I, converter II and converter III, respectively, and are connected to the output terminals of main pipe II2, main pipe III3 and main pipe IV4, respectively.

[0035] For example, a control method for a multi-furnace air supply system that uses blower I and blower III to supply air to the Isa furnace, converter I, and converter II respectively includes the following steps: Step S1: Start the air supply fan I and open the gate valve I10. The compressed air generated by the air supply fan I flows to the Isa furnace through the main pipe I1. At the same time, control the opening of the regulating valve I18 to control the air supply pressure at the output end of the main pipe I1 at [0.11MPa, 0.12MPa]. Step S2: Based on step S1, the opening of regulating valve I18 remains unchanged, gate valve II11 and gate valve IX26 are opened, and the opening of the two regulating valves VIII28 is changed so that the excess compressed air supplied to the Isa furnace by the main pipe I1 flows to converter I in sequence through the two return pipes 25, connecting pipe I24 and main pipe II2; at the same time, the opening of regulating valve III20 is changed so that the air supply pressure at the output end of main pipe II2 is controlled at [0.08MPa, 0.095MPa]; Step S3: Based on step S2, start the blower III, open gate valve III12 and regulating valve IV21, and the compressed air generated by blower III flows to converter II through main pipe III3; at the same time, control and change the opening of regulating valve V22 so that the air supply pressure at the output end of main pipe III3 is controlled at [0.105MPa, 0.115MPa]; Step S4: Based on step S3, open the two gate valves X30 and control the opening of the regulating valve IX31 so that the excess compressed air supplied to converter II by main pipe III3 flows to converter I through connecting pipe II29 and main pipe II2 in sequence, in order to compensate for the problem of insufficient compressed air in converter I in step II.

[0036] It should be noted that the output air volume of one blower is 30,000 Nm³ / h, the air supply volume of the ISA furnace is 8,000 Nm³ / h, and the air supply volume of the converter is 22,000 Nm³ / h. There are losses during pipeline transportation, making it difficult for one blower to maintain the operation of one ISA furnace and one converter. Therefore, a portion of the compressed air output from another blower is needed to compensate for the converter associated with the ISA furnace.

[0037] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by this application; the dimensions of the drawings are not related to the specific physical object, and the physical object dimensions can be arbitrarily changed.

Claims

1. A multi-furnace air supply system, comprising air supply fan I, air supply fan II, air supply fan III, an Isa furnace, converter I, converter II, and converter III, characterized in that, Also includes: The air supply pipeline includes main pipes I, II, III, and IV, whose output ends are respectively connected to the Isa furnace, converter I, converter II, and converter III. The input ends of main pipes I, II, and III are respectively connected to air supply fans I, II, and III. The interior of main pipes I, II, and III near their input ends is connected to one end of branch pipes I, II, and III, respectively. The other ends of branch pipes I, II, and III are interconnected. The interior of main pipes II and III near their output ends is connected to one end of branch pipes IV and V, respectively. A return line is used to supply excess air destined for the Isa furnace to any of the converters. Compensation piping is used to compensate for the required air volume of the converter associated with the Isa furnace; The on / off state and flow rate of each pipe in the air supply pipeline, return pipeline and compensation pipeline are changed respectively, so that the two air supply devices can supply air to the Isa furnace and any two of converter I, converter II and converter III.

2. The multi-furnace air supply system according to claim 1, characterized in that, The main pipe I is equipped with a gate valve I on the side of the branch pipe I near its input end, and a regulating valve I is equipped with a regulating valve I near its output end; the main pipe II is equipped with a regulating valve II between the branch pipes II and IV it connects to, and the output end of the main pipe II is equipped with a gate valve II and a regulating valve III; the main pipe III is equipped with a regulating valve IV between the branch pipes III and V it connects to, and the output end of the main pipe III is equipped with a gate valve III and a regulating valve V; the output end of the main pipe IV is equipped with a regulating valve VI; the branch pipe I is equipped with a gate valve IV, the branch pipe II is equipped with a gate valve V, the branch pipe III is equipped with a gate valve VI, the branch pipe IV is equipped with a gate valve VII, and the branch pipe V is equipped with a gate valve VIII; the opening / closing of each gate valve and the opening degree of each regulating valve are controlled respectively to change the on / off state and flow rate of each main pipe or branch pipe.

3. The multi-furnace air supply system according to claim 2, characterized in that, The return pipeline includes a connecting pipe I that is connected to the main pipe II and the main pipe III respectively. One end of the connecting pipe I is located between the regulating valve I and the branch pipe IV, and the other end of the connecting pipe I is located between the regulating valve IV and the branch pipe V. The end of the branch pipe I located on the side of the gate valve IV adjacent to the main pipe I is connected to one end of each of the two return pipes. The other ends of the two return pipes are connected to the middle of the connecting pipe I. The ends of the connecting pipe I located on opposite sides of the two return pipes are respectively provided with a gate valve IX and a regulating valve VII. Each of the two return pipes is provided with a regulating valve VIII so that excess airflow in the main pipe I is diverted to the interior of the main pipe II or the main pipe III.

4. The multi-furnace air supply system according to claim 3, characterized in that, The compensation pipeline is provided with a connecting pipe II that is connected to the main pipe II and the main pipe III respectively. One end of the connecting pipe II is located between the connecting pipe I and the branch pipe IV, and the other end of the connecting pipe II is located between the connecting pipe I and the branch pipe V. The connecting pipe II is provided with a regulating valve IX. A gate valve X is provided on each side of the regulating valve IX. The two gate valves X control the opening and closing of the connecting pipe II, and the regulating valve IX controls the flow rate of the connecting pipe II to compensate for the required air volume of the converter associated with the blower I.

5. The multi-furnace air supply system according to claim 4, characterized in that, The air supply pipeline also includes flow meters I, II, and III respectively located at the input ends of the main pipe I, the main pipe II, and the main pipe III, and flow meters IV, V, VI, and VII respectively located at the output ends of the main pipe I, the main pipe II, the main pipe III, and the main pipe IV, to detect the gas flow at the input ends of the main pipe I, the main pipe II, and the main pipe III, and the gas flow at the output ends of the main pipe I, the main pipe II, the main pipe III, and the main pipe IV.

6. A control method for a multi-furnace kiln air supply system, characterized in that, The control method, applied to the multi-furnace air supply system according to any one of claims 1 to 5, comprises: Step S1: Drive the blower I to operate, control and change the on / off state of the main pipe I, so that the path of the blower I to the Isa furnace is open, and at the same time adjust the opening of the output end of the main pipe I to keep the air supply pressure at the input end of the converter at the first preset value. Step S2: Based on step S1, control the opening / closing and flow rate of the return pipeline, and control the opening / closing of main pipe II, main pipe III, main pipe IV, branch pipe IV and branch pipe V to make the path of the blower I to the Isa furnace and the path to the converter I, converter II or converter III open. Step S3: Based on step S2, drive the air supply fan II or the air supply fan III to perform work, control and change the on / off state of the main pipe II, the main pipe III, the main pipe IV, the branch pipe IV and the branch pipe V, so that the path of air supply fan II or the air supply fan III to converter I, converter II or converter III is open, and adjust the opening degree of the main pipe II, the main pipe III or the main pipe IV so that the air supply pressure at the input end of the two converters is maintained at the second preset value; Step S4: Based on step S3, control the opening / closing and flow rate of the compensation pipeline to compensate the excess air volume generated by the blower II or the blower III to the converter associated with the Isa furnace.

7. The control method according to claim 6, characterized in that, The first preset value is [0.08MPa, 0.095MPa], and the second preset value is [0.08MPa-0.115MPa].

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