Coking circulating fan redundancy control device and dry quenching system

Abstract

The application provides a coking circulating fan redundancy control device and a dry quenching system. The redundancy control device comprises: a coking circulating fan driven by a motor driving module; a control module selects a main power supply module or a redundant power supply module to supply power to the motor driving module according to a power supply switching signal; when a main power supply branch in the main power supply module is in a non-operating state, the control module turns on a relevant redundant power supply branch in the redundant power supply module based on a redundant operation signal, so that the coking circulating fan can stably operate. The redundancy control device provided by the application can directly switch to the redundant power supply module to supply power to the motor driving module when the main power supply module fails, without affecting production and impacting the safety of the dry quenching boiler. The redundancy device is simple in structure, low in cost and convenient in redundant power supply module switching.

Description

Technical Field

[0001] This invention relates to the fields of metallurgical equipment and coal chemical technology, and in particular to a redundant control device for coking circulating fans and a dry quenching system. Background Technology

[0002] In dry quenching systems, the coking circulating fan is the core equipment responsible for gas transport and flow control throughout the entire coking production process. In actual operation, the motor of the coking circulating fan operates at 6kV, while the grid input voltage is 10kV. A high-voltage frequency converter converts the grid input voltage to drive the motor. If the high-voltage frequency converter malfunctions, the coking circulating fan cannot be driven, resulting in its inability to operate normally, prolonged troubleshooting time, and a wide-ranging impact.

[0003] In existing technology, the two sets of dry quenching circulating fans adopt a variable frequency operation mode: one-to-one drive, each driven by a 1700kW high-voltage motor by a high-voltage frequency converter. After long-term operation, the failure rate of the high-voltage frequency converter increases dramatically. Once a failure occurs and the machine stops, production will be halted. Moreover, due to the high integration and technical complexity of the frequency converter, and the long fault diagnosis time, recovery is not possible in a short period of time, which has a significant impact on the safe and stable operation of the dry quenching boiler. Summary of the Invention

[0004] This invention provides a redundant control device for coking circulating fans and a dry quenching system to solve technical problems such as long downtime, high repair difficulty, and long-term production impact after the failure of the drive frequency converter of coking circulating fans.

[0005] This invention provides a redundant control device for a coking circulating fan, the redundant control device comprising:

[0006] Motor drive module, used to connect to and drive coking circulating fan; The main power supply module has its input terminal connected to the first power supply voltage and its output terminal connected to the motor drive module. A redundant power supply module has its input terminal connected to a second power supply voltage and its output terminal connected to the motor drive module. The control module is connected to the control terminals of the main power supply module and the redundant power supply module, respectively. It receives power switching signals and redundant operation signals, and selects the main power supply module or the redundant power supply module to supply power to the motor drive module based on the power switching signals. When the main power supply branch of the main power supply module is in a non-operating state, it conducts the relevant redundant power supply branches in the redundant power supply module according to the redundant operation signals to ensure the stable operation of the coking circulating fan.

[0007] In one embodiment of the present invention, the main power supply module includes a first frequency converter, a second frequency converter, a first bypass unit, and a second bypass unit. The first power supply voltage is connected to the input terminal of the first bypass unit after passing through the first frequency converter, and the first power supply voltage is also connected to the input terminal of the second bypass unit after passing through the second frequency converter. The output terminal of the first bypass unit is the first output terminal of the main power supply module, and the output terminal of the second bypass unit is the second output terminal of the main power supply module.

[0008] In one embodiment of the present invention, the redundant power supply module includes an incoming line cabinet, a redundant frequency converter, a third bypass unit, and a fourth bypass unit. The second power supply voltage is connected to the redundant frequency converter after passing through the incoming line cabinet. The first output terminal of the redundant frequency converter is connected to the input terminal of the third bypass unit, and the second output terminal of the redundant frequency converter is connected to the input terminal of the fourth bypass unit. The output terminal of the third bypass unit is the first output terminal of the redundant power supply module, and the output terminal of the fourth bypass unit is the second output terminal of the redundant power supply module.

[0009] In one embodiment of the present invention, the first bypass unit has the same structure as the second bypass unit, the third bypass unit, and the fourth bypass unit. The first bypass unit includes a first capacitor, a second capacitor, a first indicator light, a second indicator light, a first switch, and a first resistor. The first terminal of the first switch is grounded after passing through the first capacitor and the first indicator light. The second terminal of the first switch is grounded after passing through the second capacitor and the second indicator light. The second terminal of the first switch is also grounded after passing through the first resistor. The first terminal of the first switch is the input terminal of the first bypass unit, the second terminal of the first switch is the output terminal of the first bypass unit, and the control terminal of the first switch is the control terminal of the first bypass unit.

[0010] In one embodiment of the present invention, the first switch in the first bypass unit is interlocked with the first switch in the third bypass unit, and the first switch in the second bypass unit is interlocked with the first switch in the fourth bypass unit.

[0011] In one embodiment of the present invention, the power switching signal includes a first control signal, a second control signal, and a third control signal. The control module includes a first three-position switch, a second three-position switch, and a third three-position switch. The control terminal of the first three-position switch is connected to the first control signal to select one of the first frequency converter and the redundant frequency converter to supply power to the first motor in the motor drive module. The control terminal of the second three-position switch is connected to the second control signal to select one of the second frequency converter and the redundant frequency converter to supply power to the second motor in the motor drive module. The control terminal of the third three-position switch is connected to the third control signal to switch the relevant redundant power supply branch in the redundant control module.

[0012] In one embodiment of the present invention, the redundant operation signal includes a redundant line start signal, and the control module further includes a first six-layer three-position switch. The first six-layer three-position switch starts the corresponding redundant power supply branch according to the redundant line start signal. The first position of the first six-layer three-position switch starts the first redundant power supply branch, the second position of the first six-layer three-position switch does not start the redundant power supply branch, and the third position of the first six-layer three-position switch starts the second redundant power supply branch. The first redundant power supply branch is composed of the redundant frequency converter and the third bypass unit, and the second redundant power supply branch is composed of the redundant frequency converter and the fourth bypass unit.

[0013] In one embodiment of the present invention, the redundant operating signal further includes an operating control signal, and the control module further includes a second six-layer three-position switch. The second six-layer three-position switch detects and controls the redundant frequency converter to drive the operating data of different coking circulating fans according to the operating control signal. The first position of the second six-layer three-position switch is to detect and control the operating data of the first coking circulating fan, the second position of the second six-layer three-position switch is to not transmit the operating data, and the third position of the second six-layer three-position switch is to detect and control the operating data of the second coking circulating fan.

[0014] The present invention also provides a dry quenching system, which includes a redundant control device for the coking circulating fan as described above.

[0015] The beneficial effects of this invention are as follows: This invention provides a redundant control device for a coking circulating fan and a dry quenching system. The redundant control device includes: a motor drive module for driving the coking circulating fan; a main power supply module for supplying power to the motor drive module; a redundant power supply module for providing redundant power to the motor drive module; and a control module for receiving power switching signals and switching the power supply circuit of the motor drive module based on the power switching signals. One end of the main power supply module is connected to a first power supply voltage, and the other end is connected to the motor drive module. One end of the redundant power supply module is connected to a second power supply voltage, and the other end is connected to the motor drive module. The control module is connected to the control terminals of the main power supply module and the redundant power supply module. The redundant control device provided by this invention can directly switch to the redundant power supply module to supply power to the motor drive module when the main power supply module fails, without affecting production or impacting the safety of the dry quenching boiler. This redundant device has a simple structure, low cost, and convenient operation. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a block diagram of a redundant control device for a coking circulating fan provided in one embodiment of the present invention; Figure 2 This is a detailed structural diagram of a redundant control device for a coking circulating fan provided in one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a first three-position switch provided in one embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a second and third position switch provided in one embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a third three-position switch provided in one embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a first six-layer three-position switch provided in one embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a second six-layer three-position switch provided in one embodiment of the present invention.

[0018] The attached figures are labeled as follows: 110 - Motor drive module; 120 - Main power supply module; 121 - First bypass unit; 122 - Second bypass unit; 130 - Redundant power supply module; 131 - Third bypass unit; 132 - Fourth bypass unit; 140 - Control module; VCC1 - First power supply voltage; VCC2 - Second power supply voltage. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0022] In dry quenching systems, the coking circulating fan is the core equipment responsible for gas transport and flow control throughout the entire coking production process. In actual operation, the motor of the coking circulating fan operates at 6kV, while the grid input voltage is 10kV. A high-voltage frequency converter converts the grid input voltage to drive the motor. If the high-voltage frequency converter malfunctions, the coking circulating fan cannot be driven, resulting in its inability to operate normally, prolonged troubleshooting time, and a wide-ranging impact.

[0023] In existing technology, the two sets of dry quenching circulating fans adopt a variable frequency operation mode: one-to-one drive, each driven by a 1700kW high-voltage motor by a high-voltage frequency converter. As the operating time of the high-voltage frequency converter increases, the probability of its failure soars. Once a failure occurs and the machine stops, production will cease. Furthermore, due to the high integration, technical complexity, and long fault diagnosis time of the frequency converter, recovery cannot be achieved in a short period of time, which has a significant impact on the safe and stable operation of the dry quenching boiler. Moreover, redundant control switching is complex and cannot be adjusted or switched according to actual conditions.

[0024] like Figure 1 As shown, the present invention provides a redundant control device for a coking circulating fan, the redundant control device comprising: Motor drive module 110 is used to connect to and drive the coking circulating fan; The main power supply module 120 has its input terminal connected to the first power supply voltage VCC1 and its output terminal connected to the motor drive module 110. The redundant power supply module 130 has its input terminal connected to the second power supply voltage VCC2 and its output terminal connected to the motor drive module 110. The control module 140 is connected to the control terminal of the main power supply module 120 and the control terminal of the redundant power supply module 130 respectively. It receives power switching signals and redundant operation signals. Based on the power switching signals, it selects the main power supply module 120 or the redundant power supply module 130 to supply power to the motor drive module 110. When the main power supply branch of the main power supply module 120 is in a non-operating state, it conducts the relevant redundant power supply branch in the redundant power supply module 130 according to the redundant operation signals to ensure the stable operation of the coking circulating fan.

[0025] Specifically, such as Figure 1 As shown, the first power supply voltage VCC1 is 10KV, and the second power supply voltage VCC2 is also 10KV. The first power supply voltage VCC1 supplies power to the motor drive module 110 through the main power supply module 120, and the second power supply voltage VCC2 supplies power to the motor drive module 110 through the redundant power supply module 130. The control module 120 receives power switching signals and redundant operation signals. When the main power supply branch in the main power supply module 120 is in a non-operating state such as fault, maintenance, or offline, the control module 140 controls the relevant main power supply branch in the main power supply module 120 to be in a stopped state, and switches to the corresponding redundant power supply branch in the redundant power supply module 130 according to the power switching signal. According to the redundant operation signal, the corresponding redundant power supply branch is started, thereby realizing redundant power supply to the motor drive module 110 to ensure stable operation of the coking circulating fan.

[0026] In detail, such as Figure 2As shown, the main power supply module 120 includes a first frequency converter, a second frequency converter, a first bypass unit 121, and a second bypass unit 122. The first power supply voltage VCC1 is connected to the input terminal of the first bypass unit 121 after passing through the first frequency converter. The first power supply voltage VCC1 is also connected to the input terminal of the second bypass unit 122 after passing through the second frequency converter. The output terminal of the first bypass unit 121 is the first output terminal of the main power supply module 120, which is connected to the first motor M1 in the motor drive module 110. The output terminal of the second bypass unit 122 is the second output terminal of the main power supply module 120, which is connected to the second motor M2 in the motor drive module 110. The first main power supply branch consists of the first frequency converter and the first bypass unit 121, and the second main power supply branch consists of the second frequency converter and the second bypass unit 122.

[0027] In detail, such as Figure 2 As shown, the redundant power supply module 130 includes an incoming line cabinet, a redundant frequency converter, a third bypass unit 131, and a fourth bypass unit 132. The second power supply voltage VCC2 is connected to the redundant frequency converter after passing through the incoming line cabinet. The first output terminal of the redundant frequency converter is connected to the input terminal of the third bypass unit 131, and the second output terminal of the redundant frequency converter is connected to the input terminal of the fourth bypass unit 132. The output terminal of the third bypass unit 131 is the first output terminal of the redundant power supply module 130, which is connected to the first motor M1 in the motor drive module 110. The output terminal of the fourth bypass unit 132 is the second output terminal of the redundant power supply module 130, which is connected to the second motor M2 in the motor drive module 110. The first redundant power supply branch consists of the redundant frequency converter and the third bypass unit 131, and the second redundant power supply branch consists of the redundant frequency converter and the fourth bypass unit 132.

[0028] In detail, such as Figure 2As shown, the first bypass unit 121 has the same structure as the second bypass unit 122, the third bypass unit 131, and the fourth bypass unit 132. The first bypass unit 121 includes a first capacitor C11, a second capacitor C21, a first indicator light L11, a second indicator light L21, a first switch QF11, and a first resistor R11. The first terminal of the first switch QF11 is grounded through the first capacitor C11 and the first indicator light L11, and the second terminal of the first switch QF11 is grounded through the second capacitor C21 and the second indicator light L21. The second terminal of the first switch QF11 is also grounded through the first resistor R11. The first terminal of the first switch QF11 is the input terminal of the first bypass unit 121, which is connected to the output terminal of the first frequency converter. The second terminal of the first switch QF11 is the output terminal of the first bypass unit 121, which is connected to the first motor M1. The control terminal of the first switch QF11 is the control terminal of the first bypass unit 121, which is connected to the control module 140.

[0029] Specifically, such as Figure 2 As shown, the second bypass unit 122 includes a first capacitor C12, a second capacitor C22, a first indicator light L12, a second indicator light L22, a first switch QF12, and a first resistor R12. The first terminal of the first switch QF12 is grounded through the first capacitor C12 and the first indicator light L12. The second terminal of the first switch QF12 is grounded through the second capacitor C22 and the second indicator light L22. The second terminal of the first switch QF12 is also grounded through the first resistor R12. The first terminal of the first switch QF12 is the input terminal of the second bypass unit 122, which is connected to the output terminal of the second frequency converter. The second terminal of the first switch QF12 is the output terminal of the second bypass unit 122, which is connected to the second motor M2. The control terminal of the first switch QF12 is the control terminal of the second bypass unit 122, which is connected to the control module 140.

[0030] Specifically, such as Figure 2As shown, the third bypass unit 131 includes a first capacitor C13, a second capacitor C23, a first indicator light L13, a second indicator light L23, a first switch QF13, and a first resistor R13. The first terminal of the first switch QF13 is grounded through the first capacitor C13 and the first indicator light L13. The second terminal of the first switch QF13 is grounded through the second capacitor C23 and the second indicator light L23. The second terminal of the first switch QF13 is also grounded through the first resistor R13. The first terminal of the first switch QF13 is the input terminal of the third bypass unit 131, which is connected to the first output terminal of the redundant frequency converter. The second terminal of the first switch QF13 is the output terminal of the third bypass unit 131, which is connected to the first motor M1. The control terminal of the first switch QF13 is the control terminal of the third bypass unit 131, which is connected to the control module 140.

[0031] Specifically, such as Figure 2 As shown, the fourth bypass unit 132 includes a first capacitor C14, a second capacitor C24, a first indicator light L14, a second indicator light L24, a first switch QF14, and a first resistor R14. The first terminal of the first switch QF14 is grounded through the first capacitor C14 and the first indicator light L14, and the second terminal of the first switch QF14 is grounded through the second capacitor C24 and the second indicator light L24. The second terminal of the first switch QF14 is also grounded through the first resistor R14. The first terminal of the first switch QF14 is the input terminal of the fourth bypass unit 132, which is connected to the second output terminal of the redundant frequency converter. The second terminal of the first switch QF14 is the output terminal of the fourth bypass unit 132, which is connected to the second motor M2. The control terminal of the first switch QF14 is the control terminal of the fourth bypass unit 132, which is connected to the control module 140.

[0032] More specifically, the first switch QF11 in the first bypass unit 121 is interlocked with the first switch QF13 in the third bypass unit 131, and the first switch QF12 in the second bypass unit 122 is interlocked with the first switch QF14 in the fourth bypass unit 132. The first switches QF13 and QF14 cannot be closed simultaneously to avoid short circuits.

[0033] Specifically, the power switching signals include a first control signal, a second control signal, and a third control signal, such as... Figures 3 to 5As shown, the control module 140 includes a first three-position switch S1, a second three-position switch S2, and a third three-position switch S3. The control terminal of the first three-position switch S1 is connected to a first control signal to select one of the first frequency converter and the redundant frequency converter to supply power to the first motor M1 in the motor drive module 110. The control terminal of the second three-position switch S2 is connected to a second control signal to select one of the second frequency converter and the redundant frequency converter to supply power to the second motor M2 in the motor drive module 110. The control terminal of the third three-position switch S3 is connected to a third control signal to switch the relevant redundant power supply branch in the redundant control module 140.

[0034] Specifically, such as Figure 3 As shown, the control module 140 includes a first three-position switch S1. The input ports of the first three-position switch S1 include starting (1# start), disconnecting high voltage (1# disconnect high voltage), and connecting high voltage (1# connect high voltage). The starting input port of the first coking circulating fan is connected to relay KA11 after the first position of the first three-position switch S1. Relay KA11 controls the starting of the first frequency converter. The disconnecting high voltage input port of the first coking circulating fan is connected to relay KA12 after the first position of the first three-position switch S1. Relay KA12 controls the first frequency converter to disconnect the high voltage input (i.e., disconnect the first power supply voltage VCC1). The connecting high voltage input port of the first coking circulating fan is connected to relay KA13 after the first position of the first three-position switch S1. Relay KA13 controls the first frequency converter to close the high voltage input (i.e., connect the first power supply voltage VCC1). The starting input port of the first coking circulating fan is connected to relay KA14 after the third position of the first three-position switch S1. Relay KA14 starts the standby frequency converter.

[0035] Table 1 Function table of the first and third position switches

[0036] As shown in Table 1, when the first three-position switch S1 is rotated to the first position according to the first control signal, the power switching signal can only control the first frequency converter; when the first three-position switch S1 is rotated to the second position according to the first control signal, the first motor M1 is not powered; when the first three-position switch S1 is rotated to the third position according to the first control signal, the control module 140 can only control the redundant frequency converter. At this time, the first frequency converter cannot be controlled by the control module 140, which facilitates the offline maintenance and backup of the first frequency converter.

[0037] Specifically, such as Figure 4As shown, the control module 140 includes a second and third position switch S2. The input ports of the second and third position switch S2 include starting (2# start), disconnecting high voltage (2# disconnect high voltage), and connecting high voltage (2# connect high voltage). The starting input port of the second coking circulating fan is connected to relay KA21 after the first position of the second and third position switch S2. Relay KA21 controls the starting of the second frequency converter. The disconnecting high voltage input port of the second coking circulating fan is connected to relay KA22 after the first position of the second and third position switch S2. Relay KA22 controls the second frequency converter to disconnect the high voltage input (i.e., disconnect the first power supply voltage VCC1). The connecting high voltage input port of the second coking circulating fan is connected to relay KA23 after the first position of the second and third position switch S2. Relay KA23 controls the second frequency converter to connect the high voltage input (i.e., connect the first power supply voltage VCC1). The starting input port of the second coking circulating fan is connected to relay KA24 after the third position of the second and third position switch S2. Relay KA24 starts the standby frequency converter.

[0038] Table 2 Function Table of Second and Third Position Switches

[0039] As shown in Table 1, when the second-third position switch S2 is rotated to the first position according to the second control signal, the power switching signal can only control the second frequency converter; when the first-third position switch S1 is rotated to the second position according to the first control signal, the second motor M2 is not powered; when the second-third position switch S2 is rotated to the third position according to the second control signal, the control module 140 can only control the redundant frequency converter. At this time, the second frequency converter cannot be controlled by the control module 140, which facilitates the offline maintenance and backup of the second frequency converter.

[0040] like Figure 5 As shown, the first terminal of the first three-position switch S1 is connected to the first terminal of relay KA31 via the first position of the third three-position switch S3. The first terminal of the second three-position switch S2 is connected to the first terminal of relay KA31 via the third position of the third three-position switch S3. The second terminal of the first three-position switch S1 is connected to the second terminal of the second three-position switch S2. When relay KA31 is energized, it indicates that the redundant frequency converter has started. The redundant start status can be reflected by the normally closed and normally open contacts associated with relay KA31. Figure 5 (Not shown in the image).

[0041] Table 3 Function Table of Third Position Switch

[0042] As shown in Table 1, when the third gear switch S3 is rotated to the first gear according to the third control signal, the redundant frequency converter is started, thereby closing the first switch QF13 in the third bypass unit, thereby driving the first motor M1 to ensure the stable operation of the first coking circulating fan; when the third gear switch S3 is rotated to the second gear according to the third control signal, the redundant frequency converter is not started; when the third gear switch S3 is rotated to the third gear according to the third control signal, the redundant frequency converter is started, thereby closing the first switch QF14 in the fourth bypass unit, thereby driving the second motor M2 to ensure the stable operation of the second coking circulating fan.

[0043] It should be mentioned that "1#" refers to the circuit selection for driving the first coking circulating fan, and "2#" refers to the circuit selection for driving the second coking circulating fan. The following lines have the same meaning, so they will not be repeated here.

[0044] More specifically, the redundant operation signal includes a redundant line start signal. The control module 140 also includes a first six-layer three-position switch S4. The first six-layer three-position switch S4 starts the corresponding redundant power supply branch according to the redundant line start signal. The first position of the first six-layer three-position switch S4 starts the first redundant power supply branch. The second position of the first six-layer three-position switch S4 does not start the redundant power supply branch. The third position of the first six-layer three-position switch S4 starts the second redundant power supply branch. The first redundant power supply branch is composed of a redundant frequency converter and a third bypass unit 131, and the second redundant power supply branch is composed of a redundant frequency converter and a fourth bypass unit 132.

[0045] Specifically, such as Figure 6 As shown, the first position of the first six-layer three-position switch S4 is used to simultaneously input the 24V control power supply of the redundant frequency converter (minor fault, major fault, ready, running, remote selection, and same source) to the third bypass unit 131 to drive the first motor M1; the second position of the first six-layer three-position switch S4 does not output the signal of the redundant frequency converter; the third position of the first six-layer three-position switch S4 simultaneously inputs the 24V control power supply of the redundant frequency converter (minor fault, major fault, ready, running, remote selection, and same source) to the fourth bypass unit 132 to drive the second motor M2.

[0046] Table 4 Function Table of the Three-Position Switch on the First Sixth Floor

[0047] As shown in Table 4, when the first six-layer three-position switch S4 rotates to the first position according to the redundant line start signal, the status signals of the redundant frequency converter (minor fault, major fault, ready, running, remote selection, control power input) are simultaneously switched to the third bypass unit 131 as condition judgment and status indication; when the first six-layer three-position switch S4 rotates to the second position according to the redundant line start signal, the redundant frequency converter does not output status signals; when the first six-layer three-position switch S4 rotates to the third position according to the redundant line start signal, the status signals of the redundant frequency converter (minor fault, major fault, ready, running, remote selection, control power input) are simultaneously switched to the fourth bypass unit 132; thus realizing the function of one switch to synchronously split multiple signals of the redundant frequency converter into two, and ensuring the homogeneity of the power supply.

[0048] More specifically, the redundant operating signals also include operating control signals. The control module 140 also includes a second six-layer three-position switch S5. The second six-layer three-position switch S5 detects and controls the operating data of the redundant frequency converter driving different coking circulating fans according to the operating control signals. The first position of the second six-layer three-position switch S5 is to detect and control the operating data of the first coking circulating fan. The second position of the second six-layer three-position switch S5 is to not transmit operating data. The third position of the second six-layer three-position switch S5 is to detect and control the operating data of the second coking circulating fan.

[0049] Specifically, such as Figure 7 As shown, the first position of the second six-layer three-position switch S5 uses a redundant frequency converter to provide frequency input, current feedback, and speed feedback for the first coking circulating fan; the second position of the second six-layer three-position switch S5 transmits operating data; and the third position of the second six-layer three-position switch S5 uses a redundant frequency converter to provide frequency input, current feedback, and speed feedback for the second coking circulating fan.

[0050] Table 5 Function Table of the Second and Sixth Floor Three-Position Switch

[0051] As shown in Table 5, the second six-layer three-position switch S5 rotates to the first position according to the operation control signal, enabling the redundant frequency converter to detect and control the operating data of the first coking circulating fan. This includes feedback from the redundant frequency converter regarding frequency increases and decreases, current increases and decreases, and speed increases and decreases. When the second six-layer three-position switch S5 rotates to the second position according to the operation control signal, the redundant frequency converter does not transmit operating data. When the second six-layer three-position switch S5 rotates to the third position according to the operation control signal, the redundant frequency converter detects and controls the operating data of the second coking circulating fan, including feedback from the redundant frequency converter regarding frequency increases and decreases, current increases and decreases, and speed increases and decreases. The three-position switch S5 on the second and sixth layers enables synchronous switching of three signals: frequency setting, current feedback, and speed feedback. This solves the control error problem caused by asynchronous signal input. Each position corresponds to only one coking circulating fan, ensuring operational portability and saving on equipment investment.

[0052] Please see Figures 1 to 7 The working principle of the redundant control device for coking circulating fans provided by this invention is as follows: When the two sets of coking circulating fans are working normally, the first switch QF11 and the first switch QF12 are closed, and the first switch QF13 and the first switch QF14 are open. The first power supply VCC1 supplies power to the motor drive module 110 through the main power supply module 120, so that the first motor M1 and the second motor M2 can run.

[0053] After receiving the shutdown signal of the first frequency converter, the control module 140 rotates the first three-position switch S1 to the third position (+45°) according to the first control signal, starts the backup frequency converter and disconnects the first switch QF11; at the same time, according to the third control signal, the third three-position switch S3 is rotated to the first position (-45°). At this time, the relay KA31 is energized, and the relevant normally open contacts close, reflecting the startup of the redundant frequency converter. According to the redundant line startup signal, the first six-layer three-position switch S4 is rotated to the first position (-45°), starting the first redundant power supply branch (i.e., controlling the first switch QF13 in the third bypass unit 131 to close), and the status signals of the redundant frequency converter (minor fault, major fault, ready, running, remote selection, control power input) are all switched to the third bypass unit 131 at the same time. Finally, according to the operation control signal, the second six-layer three-position switch S5 is controlled to rotate to the first position, realizing the frequency setting, current feedback and speed feedback of the first coking circulating fan, and completing the control of switching the first main power supply branch to the first redundant power supply branch.

[0054] After receiving the shutdown signal of the second frequency converter, the control module 140 rotates the second three-position switch S2 to the third position (+45°) according to the second control signal, starts the standby frequency converter and disconnects the first switch QF12; at the same time, according to the third control signal, the third three-position switch S3 is rotated to the third position (+45°). At this time, the relay KA31 is energized, and the relevant normally open contacts close, reflecting the start of the redundant frequency converter. According to the redundant line start signal, the first six-position three-position switch S4 is rotated to the third position (+45°), starting the second redundant power supply branch (i.e., controlling the first switch QF14 in the fourth bypass unit 132 to close), and simultaneously switching the status signals of the redundant frequency converter (minor fault, major fault, ready, running, remote selection, control power input) to the fourth bypass unit 132. Finally, according to the operation control signal, the second six-position three-position switch S5 is controlled to rotate to the third position, realizing the frequency setting control, current feedback and speed feedback of the second coking circulating fan, and completing the control of switching the second main power supply branch to the second redundant power supply branch.

[0055] After the control module 140 receives the shutdown of the redundant frequency converter, the first frequency converter needs to supply power to the first bypass unit 121. According to the third control signal, the third three-position switch S3 is rotated to the second position (0°) to prevent the redundant frequency converter from starting. According to the redundant line start signal, the first six-layer three-position switch S4 is rotated to the second position (0°) to prevent any redundant power supply branch from starting. Finally, according to the operation control signal, the second six-layer three-position switch S5 is controlled to rotate to the second position to stop the acquisition of operation data. According to the first control signal, the first three-position switch S1 is rotated to the first position (-45°) to start the first frequency converter and disconnect the first switch QF13. The drive of the first motor M1 is switched from the redundant frequency converter to the first frequency converter.

[0056] After the control module 140 receives the shutdown of the redundant frequency converter, the second frequency converter needs to supply power to the second bypass unit 122. According to the third control signal, the third three-position switch S3 is rotated to the second position (0°) to prevent the redundant frequency converter from starting. According to the redundant line start signal, the first six-layer three-position switch S4 is rotated to the second position (0°) to prevent any redundant power supply branch from starting. Finally, according to the operation control signal, the second six-layer three-position switch S5 is controlled to rotate to the second position to stop the acquisition of operation data. According to the second control signal, the second three-position switch S2 is rotated to the first position (-45°) to start the second frequency converter and disconnect the first switch QF14. The drive of the second motor M2 is switched from the redundant frequency converter to the second frequency converter.

[0057] The present invention also provides a dry quenching system, which includes a redundant control device for the coking circulating fan as described above, to ensure that the dry quenching system can operate stably.

[0058] This invention provides a redundant control device for a coking circulating fan and a dry quenching system. The redundant control device includes: driving the coking circulating fan via a motor drive module; the control module selects either a main power supply module or a redundant power supply module to supply power to the motor drive module based on a power switching signal; when the main power supply branch in the main power supply module is not in operation, the control module activates the relevant redundant power supply branch in the redundant power supply module based on a redundant operation signal to ensure stable operation of the coking circulating fan. The redundant control device provided by this invention can directly switch to the redundant power supply module to supply power to the motor drive module when the main power supply module fails, without affecting production or impacting the safety of the dry quenching boiler. This redundant device has a simple structure, low cost, and convenient redundant power supply module switching method.

[0059] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A redundant control device for a coking circulating fan, characterized in that, The redundancy control device includes: Motor drive module, used to connect to and drive coking circulating fan; The main power supply module has its input terminal connected to the first power supply voltage and its output terminal connected to the motor drive module. A redundant power supply module has its input terminal connected to a second power supply voltage and its output terminal connected to the motor drive module. The control module is connected to the control terminals of the main power supply module and the redundant power supply module, respectively. It receives power switching signals and redundant operation signals, and selects the main power supply module or the redundant power supply module to supply power to the motor drive module based on the power switching signals. When the main power supply branch of the main power supply module is in a non-operating state, it conducts the relevant redundant power supply branches in the redundant power supply module according to the redundant operation signals to ensure the stable operation of the coking circulating fan.

2. The redundant control device for coking circulating fans according to claim 1, characterized in that, The main power supply module includes a first frequency converter, a second frequency converter, a first bypass unit, and a second bypass unit. The first power supply voltage is connected to the input terminal of the first bypass unit after passing through the first frequency converter. The first power supply voltage is also connected to the input terminal of the second bypass unit after passing through the second frequency converter. The output terminal of the first bypass unit is the first output terminal of the main power supply module, and the output terminal of the second bypass unit is the second output terminal of the main power supply module.

3. The redundant control device for coking circulating fans according to claim 2, characterized in that, The redundant power supply module includes an incoming line cabinet, a redundant frequency converter, a third bypass unit, and a fourth bypass unit. The second power supply voltage is connected to the redundant frequency converter after passing through the incoming line cabinet. The first output terminal of the redundant frequency converter is connected to the input terminal of the third bypass unit, and the second output terminal of the redundant frequency converter is connected to the input terminal of the fourth bypass unit. The output terminal of the third bypass unit is the first output terminal of the redundant power supply module, and the output terminal of the fourth bypass unit is the second output terminal of the redundant power supply module.

4. The redundant control device for coking circulating fans according to claim 3, characterized in that, The first bypass unit has the same structure as the second bypass unit, the third bypass unit, and the fourth bypass unit. The first bypass unit includes a first capacitor, a second capacitor, a first indicator light, a second indicator light, a first switch, and a first resistor. The first terminal of the first switch is grounded after passing through the first capacitor and the first indicator light. The second terminal of the first switch is grounded after passing through the second capacitor and the second indicator light. The second terminal of the first switch is also grounded after passing through the first resistor. The first terminal of the first switch is the input terminal of the first bypass unit, the second terminal of the first switch is the output terminal of the first bypass unit, and the control terminal of the first switch is the control terminal of the first bypass unit.

5. The redundant control device for coking circulating fans according to claim 4, characterized in that, The first switch in the first bypass unit is interlocked with the first switch in the third bypass unit, and the first switch in the second bypass unit is interlocked with the first switch in the fourth bypass unit.

6. The redundant control device for coking circulating fans according to claim 3, characterized in that, The power switching signal includes a first control signal, a second control signal, and a third control signal. The control module includes a first three-position switch, a second three-position switch, and a third three-position switch. The control terminal of the first three-position switch is connected to the first control signal to select one of the first frequency converter and the redundant frequency converter to supply power to the first motor in the motor drive module. The control terminal of the second three-position switch is connected to the second control signal to select one of the second frequency converter and the redundant frequency converter to supply power to the second motor in the motor drive module. The control terminal of the third three-position switch is connected to the third control signal to switch the relevant redundant power supply branch in the redundant control module.

7. The redundant control device for coking circulating fans according to claim 6, characterized in that, The redundant operation signal includes a redundant line start signal. The control module also includes a first six-layer three-position switch. The first six-layer three-position switch starts the corresponding redundant power supply branch according to the redundant line start signal. The first position of the first six-layer three-position switch starts the first redundant power supply branch. The second position of the first six-layer three-position switch does not start the redundant power supply branch. The third position of the first six-layer three-position switch starts the second redundant power supply branch. The first redundant power supply branch is composed of the redundant frequency converter and the third bypass unit. The second redundant power supply branch is composed of the redundant frequency converter and the fourth bypass unit.

8. The redundant control device for coking circulating fans according to claim 7, characterized in that, The redundant operating signal also includes an operating control signal. The control module also includes a second six-layer three-position switch. The second six-layer three-position switch detects and controls the redundant frequency converter to drive the operating data of different coking circulating fans according to the operating control signal. The first position of the second six-layer three-position switch is to detect and control the operating data of the first coking circulating fan. The second position of the second six-layer three-position switch is to not transmit the operating data. The third position of the second six-layer three-position switch is to detect and control the operating data of the second coking circulating fan.

9. A dry quenching system, characterized in that, The dry quenching system includes a redundant control device for the coking circulating fan as described in any one of claims 1-8.

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