A furnace electric control device and method

Abstract

The present invention belongs to the technical field of radioactive waste treatment, and specifically relates to a furnace electric control device and method. The furnace electric control device is used to control the operation of the furnace (17), including an operation monitoring and logic processing layer and an electrical processing layer connected by a signal line, and the electrical processing layer is connected to the furnace (17) by a power line; the operation monitoring and logic processing layer is used to monitor the operation of the furnace (17), program configuration, and receive the voltage and current feedback signals of the electrical processing layer and perform control logic processing; the electrical processing layer is used to adjust the electrical signal for controlling the operation of the furnace (17) according to the switching command signal of the operation monitoring and logic processing layer. Compared with the existing furnace electric control device, the present invention reduces one control loop and saves about one-fifth of the cost of the electric control equipment. According to the different stages of furnace heating, the silicon carbon rod heating loop and the electrode heating loop are used to share the equipment, which can improve the economy.

Description

Technical Field

[0001] The invention belongs to the technical field of radioactive waste treatment, and in particular relates to a furnace electric control device and method. Background Art

[0002] Vitrification refers to the treatment technology of melting radioactive waste and glass formers into glass at 1000℃ or higher. It is one of the methods for solidifying high-radioactive liquid waste. The core equipment of vitrification is the furnace, and the temperature of the furnace is controlled by several silicon carbon rods and electrodes. The heating of the furnace is divided into two stages. The startup heating stage uses two silicon carbon rod heating circuits for heating, and the Joule heating stage during normal operation uses electrodes for temperature control.

[0003] There are two silicon carbon rod heating circuits, including the ST01-ST04 circuit and the ST05 circuit using silicon carbon rods;

[0004] There are 6 electrode heating circuits. The heating elements in the furnace 17 include 8 Joule heating electrodes, namely E1, E2, E3, E4, E5, E6, E7 and E8, which are arranged at different heights and positions in the furnace (17) to form 6 heating circuits, including the upper E1-E2 circuit (E1-E2 electrode heating), the E3-E4 circuit (E3-E4 electrode heating); the middle and lower E5-E6 circuit (E5-E6 electrode heating), the lower and discharge position E7-E8 circuit (E7-E8 electrode heating), the auxiliary heating E5-E7 circuit (E5-E7 electrode heating) and the auxiliary heating E6-E7 circuit (E6-E7 electrode heating).

[0005] Existing furnace electric control devices (such as Figure 1 (as shown) uses a separate controller for calculation, and cooperates with PLC and relays for signal alarm. Current, voltage, power, set value and other signals communicate with the DCS of the whole plant through hard wiring. The DCS of the whole plant can only perform start and stop operations and monitor the relevant parameters of the furnace electric control. The actual logic operation and control are all in the local furnace electric control cabinet. This method has many interfaces and is not conducive to debugging, operation and maintenance. At the same time, the equipment in the furnace startup heating stage and normal operation stage is controlled separately, resulting in the idleness of the control cabinet and transformer originally used for the startup heating stage after the operation stage.

[0006] The corresponding relationship between each heating circuit in the furnace 17 and each transformer in the electrical processing layer of the existing furnace electric control device is shown in Table 1.

[0007] Table 1 Correspondence between the heating circuit of the existing furnace and the equipment of the furnace electric control device

[0008] Summary of the invention

[0009] The purpose of the present invention is to provide an electric control device for a melting furnace. The control device has a clear structure and can effectively ensure the safe and stable operation of the melting furnace, and is also more convenient for debugging and operation and maintenance personnel.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is a furnace electronic control device for controlling the operation of the furnace, which includes an operation monitoring and logic processing layer and an electrical processing layer connected by a signal line, and the electrical processing layer is connected to the furnace by a power line; the operation monitoring and logic processing layer is used to monitor the operation of the furnace, configure the program, and receive the voltage and current feedback signals of the electrical processing layer and perform control logic processing; the electrical processing layer is used to select and switch the control loop that controls the operation of the furnace according to the switching command signal of the operation monitoring and logic processing layer.

[0011] Furthermore, the operation monitoring and logic processing layer includes a logic control system, which is used to receive feedback signals of the voltage and the current and perform control logic processing, and is also used to send the switching command signal to control the electrical processing layer to perform voltage regulation on the furnace load so that the current follows the voltage change, thereby realizing selective switching of the control loop that controls the operation of the furnace.

[0012] Furthermore, the electrical processing layer includes a main electrical cabinet connected to an external power supply, and a first sub-electrical cabinet, a second sub-electrical cabinet, a third sub-electrical cabinet, a fourth sub-electrical cabinet and a fifth sub-electrical cabinet connected to the main electrical cabinet through the power line; the main electrical cabinet, the first sub-electrical cabinet, the second sub-electrical cabinet, the third sub-electrical cabinet, the fourth sub-electrical cabinet and the fifth sub-electrical cabinet are respectively connected to the logic control system through the signal line, for sending feedback signals of the voltage and the current to the logic control system.

[0013] further,

[0014] The electrical processing layer also includes a first transformer, a second transformer, a third transformer, a fourth transformer, a fifth transformer, a loop switching device and an electrical busbar;

[0015] The first transformer is connected to the first sub-electrical cabinet, the circuit switching device and the electrical busbar respectively through the power lines;

[0016] The second transformer is connected to the second electrical sub-cabinet and the electrical busbar respectively through the power lines;

[0017] The third transformer is connected to the third electrical sub-cabinet and the circuit switching device through the power lines respectively;

[0018] The fourth transformer is connected to the fourth electrical sub-cabinet and the circuit switching device through the power lines respectively;

[0019] The fifth transformer is connected to the fifth electrical cabinet and the circuit switching device through the power lines respectively;

[0020] The first transformer, the second transformer, the third transformer, the fourth transformer and the fifth transformer are also respectively connected to the logic control system through the signal line, and are used to send feedback signals of the voltage and the current to the logic control system;

[0021] The circuit switching device is connected to the electrical busbar through the power line, and is also connected to the logic control system through the signal line, and is used to receive the switching instruction signal sent by the logic control system, select and switch the control circuit that controls the operation of the furnace, and realize the control of different heating circuits of the furnace;

[0022] The electrical busbar is connected to the furnace via the power line and is used for outputting control current to the heating elements or heating circuits in the furnace.

[0023] further,

[0024] The heating circuit of the furnace includes a silicon carbon rod heating circuit and an electrode heating circuit; the silicon carbon rod heating circuit is used for heating the furnace in the startup phase, from room temperature to an allowable operating temperature range and maintaining the temperature; the electrode heating circuit is used for Joule heating of the furnace in the operation phase after the startup phase, and temperature control within the operation range is performed according to process operation requirements;

[0025] There are two silicon carbon rod heating circuits, including ST01-ST04 circuits and ST05 circuits using silicon carbon rods;

[0026] There are 6 electrode heating circuits, and the heating elements in the furnace include 8 Joule heating electrodes, namely E1, E2, E3, E4, E5, E6, E7 and E8, which are arranged at different heights and positions in the furnace to form 6 electrode heating circuits, including the E1-E2 circuit and E3-E4 circuit in the upper part; the E5-E6 circuit in the middle and lower part, the E7-E8 circuit in the lower part and the discharge position, the E5-E7 circuit during auxiliary discharge, and the E6-E7 circuit during auxiliary discharge.

[0027] Further, the ST05 loop, the E5-E7 loop and the E6-E7 loop are set as the first combination loop, and the ST05 loop, the E5-E7 loop and the E6-E7 loop are hard-switched through the loop switching device, and soft-switched through the screen and control logic of the logic control system. Only one of the three loops can be output to the load in the furnace at the same time; the loop switching device is provided with a first switching loop for hard switching the first combination loop, and the loop switching device can feed back the selection of the first switching loop to the logic control system; logic programming is performed in the logic control system to ensure that the first combination loop controlled by the logic control system and the first switching loop of the loop switching device select the same loop for switching output at the same time.

[0028] Further, the ST01-ST04 loop and the E1-E2 loop are set as a second combination loop; the ST01-ST04 loop and the E1-E2 loop perform hard switching of the loop through the loop switching device, and perform soft switching through the screen and control logic of the logic control system. The ST01-ST04 loop and the E1-E2 loop can only select one of them to output to the load in the furnace at the same time. The loop switching device is provided with a second switching loop for hard switching of the second combination loop. The loop switching device can feed back the selection of the second switching loop to the logic control system. Logic programming is performed in the logic control system to ensure that the second combination loop controlled by the logic control system and the loop selected by the second switching loop of the loop switching device to switch output at the same time are the same loop.

[0029] To achieve the above objectives, the present invention also discloses a furnace electronic control method for the furnace electronic control device as described above, comprising the following steps:

[0030] Step S1, starting the heating stage, determining whether to select the silicon carbon rod heating circuit in the logic control system, if "yes" is selected, proceeding to step S2, if "no" is selected, executing step S4;

[0031] Step S2, putting the ST01-ST04 loops in the second combined loop and the ST05 loop in the first combined loop into operation by switching the first switching loop and the second switching loop of the loop switching device;

[0032] Step S3, starting the silicon carbon rod heating program corresponding to the ST01-ST04 loop and the ST05 loop;

[0033] Step S4, start the heating and end, and close the silicon carbon rod heating program;

[0034] Step S5, Joule heating stage, determining whether to select the electrode heating circuit in the logic control system, if "yes" is selected, proceeding to step S6, if "no" is selected, executing step S11;

[0035] Step S6, putting the E3-E4 loop, the E5-E6 loop and the E1-E2 loop in the second combination loop into operation by switching the first switching loop and the second switching loop of the loop switching device;

[0036] Step S7, starting the electrode heating programs corresponding to the E1-E2 loop, the E3-E4 loop and the E5-E6 loop;

[0037] Step S8, determining whether to select auxiliary discharge heating in the logic control system, if "yes" is selected, proceed to step S9, if "no" is selected, proceed to step S11;

[0038] Step S9, putting the E5-E7 loop or the E6-E7 loop in the first combined loop into operation through the first switching loop of the loop switching device;

[0039] Step S10, starting the electrode heating program corresponding to the E5-E7 loop or the E6-E7 loop;

[0040] Step S11, Joule heating ends and the electrode heating program is turned off.

[0041] Furthermore, the step S2, the step S3, the step S4, the step S6, the step S7, the step S9, the step S10 and the step S11 can all be manually controlled and intervened by an operator to decide whether to continue the operation or end the operation.

[0042] Furthermore, the step S1 and the step S5 also include a selection process for the first combined loop and the second combined loop, including the following steps:

[0043] Step S12, determining whether to perform an emergency stop in the logic control system, if "yes" is selected, proceed to step S19, if "no" is selected, proceed to step S13;

[0044] Step S13, judging the current running state, when the running state is "starting heating stage", entering step S14, when the running state is "Joule heating stage", entering step S16, when the running state is neither "starting heating stage" nor "Joule heating stage", entering step S18;

[0045] Step S14, determining in the logic control system whether to put the ST01-ST04 loop or the ST05 loop into operation, if "yes" is selected, proceed to step S15, if "no" is selected, proceed to step S19;

[0046] Step S15, starting the silicon carbon rod heating program corresponding to the ST01-ST04 loop or the ST05 loop, and then entering step S18;

[0047] Step S16, determining in the logic control system whether to put the E1-E2 loop or the E5-E7 and the E6-E7 loop into operation, if "yes" is selected, proceed to step S17, if "no" is selected, proceed to step S19;

[0048] Step S17, starting the electrode heating program corresponding to the E1-E2 loop or the E5-E7 and the E6-E7 loop, and then entering step S18;

[0049] Step S18, in the logic control system, the circuit selection logic of the silicon carbon rod heating program or the electrode heating program to be started is output to the circuit switching device, and the circuit switching device completes the hard switching of the corresponding circuit, and then executes step S19; or after the step S13 determines that the operating state is neither the "start-up heating stage" nor the "Joule heating stage", the step S18 selects to end the program and directly executes step S19;

[0050] Step S19, end.

[0051] The beneficial effects of the present invention are:

[0052] 1. The electric control device provided by the present invention has a clear control structure. The electrical equipment and the control unit of the logic control system 1 (i.e., the circuit switching device 15) are separately arranged, which can prevent the control personnel from contacting the electrical high voltage, thereby avoiding accidents, effectively ensuring the safety of personnel, and being more convenient for operation and maintenance.

[0053] 2. Using the logic control system 1 for centralized control can reduce equipment interfaces, improve economy, reduce failure rate, and reduce maintenance difficulty.

[0054] 3. Compared with the existing furnace electric control device, the present invention reduces one control loop, saving about one-fifth of the cost of electric control equipment. According to the different stages of furnace heating, the silicon carbon rod heating loop and the electrode heating loop can be shared to improve economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a schematic diagram of the existing electric control device for a melting furnace described in the background technology section of the present invention;

[0056] Figure 2 is a schematic diagram of a furnace electric control device described in the specific implementation mode of the present invention;

[0057] Figure 3 It is a flow chart of a furnace electric control method described in the specific implementation mode of the present invention;

[0058] Figure 4 It is a flow chart of the selection process of the first combined circuit and the second combined circuit in step S1 and step S5 of a furnace electric control method described in the specific implementation mode of the present invention (the first combined circuit and the second combined circuit are heating circuits shared by the electrode pair and the silicon carbon rod);

[0059] In all the above drawings: 1-logic control system, 2-main electrical cabinet, 3-first sub-electrical cabinet, 4-second sub-electrical cabinet, 5-third sub-electrical cabinet, 6-fourth sub-electrical cabinet, 7-fifth sub-electrical cabinet, 8-external power supply, 9-first transformer, 10-second transformer, 11-third transformer, 12-fourth transformer, 13-fifth transformer, 14-sixth transformer, 15-loop switching device, 16-electrical busbar, 17-furnace, 18-first electric control cabinet, 19-second electric control cabinet, 20-third electric control cabinet, 21-fourth electric control cabinet, 22-fifth electric control cabinet, 23-sixth electric control cabinet, 24-seventh electric control cabinet, 25-eighth electric control cabinet. DETAILED DESCRIPTION

[0060] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0061] like Figure 2 As shown, the present invention provides a furnace electronic control device for controlling the operation of the furnace 17, including an operation monitoring and logic processing layer and an electrical processing layer connected by a signal line (network communication connection), and the electrical processing layer is connected to the furnace 17 by a power line (hard wiring connection); the operation monitoring and logic processing layer is used to perform operation monitoring, program configuration, and receive voltage and current feedback signals of the electrical processing layer on the operation status of the furnace 17 and perform control logic processing; the electrical processing layer is used to select and switch the control loop that controls the operation of the furnace 17 according to the switching command signal of the operation monitoring and logic processing layer.

[0062] The operation monitoring and logic processing layer includes a logic control system 1, which is used to receive feedback signals of voltage and current and perform control logic processing. It is also used to send the switching command signal to control the electrical processing layer to perform voltage regulation, which acts on the load of the furnace 17 so that the current follows the voltage change, thereby realizing the selective switching of the control loop that controls the operation of the furnace 17.

[0063] The electrical processing layer includes a main electrical cabinet 2 connected to an external power supply 8, and a first sub-electrical cabinet 3, a second sub-electrical cabinet 4, a third sub-electrical cabinet 5, a fourth sub-electrical cabinet 6 and a fifth sub-electrical cabinet 7 connected to the main electrical cabinet 2 through a power line; the main electrical cabinet 2, the first sub-electrical cabinet 3, the second sub-electrical cabinet 4, the third sub-electrical cabinet 5, the fourth sub-electrical cabinet 6 and the fifth sub-electrical cabinet 7 are respectively connected to the logic control system 1 through signal lines, for sending voltage and current feedback signals to the logic control system 1.

[0064] The electrical processing layer also includes a first transformer 9, a second transformer 10, a third transformer 11, a fourth transformer 12, a fifth transformer 13, a circuit switching device 15 and an electrical busbar 16;

[0065] The first transformer 9 is connected to the first sub-electrical cabinet 3, the circuit switching device 15 and the electrical busbar 16 through power lines respectively;

[0066] The second transformer 10 is connected to the second electrical sub-cabinet 4 and the electrical busbar 16 through power lines respectively;

[0067] The third transformer 11 is connected to the third electrical sub-cabinet 5 and the circuit switching device 15 through power lines respectively;

[0068] The fourth transformer 12 is connected to the fourth sub-electrical cabinet 6 and the circuit switching device 15 through power lines respectively;

[0069] The fifth transformer 13 is connected to the fifth sub-electrical cabinet 7 and the circuit switching device 15 through power lines respectively;

[0070] The first transformer 9, the second transformer 10, the third transformer 11, the fourth transformer 12 and the fifth transformer 13 are also connected to the logic control system 1 through signal lines, respectively, for sending voltage and current feedback signals to the logic control system 1;

[0071] The circuit switching device 15 is connected to the electrical busbar 16 through a power line, and is also connected to the logic control system 1 through a signal line, and is used to receive a switching command signal sent by the logic control system 1, select and switch the control circuit that controls the operation of the furnace 17, and realize the control of different heating circuits of the furnace 17;

[0072] The electrical busbar 16 is connected to the furnace 17 via a power line and is used to output control current to the heating elements or heating circuits in the furnace 17 .

[0073] First, the two heating circuits of the furnace 17 and their corresponding two stages are clarified. The heating circuit of the furnace 17 includes a silicon carbon rod heating circuit and an electrode heating circuit; the silicon carbon rod heating circuit is used for heating in the startup phase of the furnace 17, from room temperature to the operating temperature allowable range, and maintained, and the silicon carbon rods are removed after the temperature of the furnace 17 rises to the set temperature; the electrode heating circuit is used in the operation phase after the startup phase, and performs Joule heating on the furnace 17, and controls the temperature within the operating range according to the process operation requirements;

[0074] There are two silicon carbon rod heating circuits, including ST01-ST04 circuits and ST05 circuits using silicon carbon rods, which are located in the second combined circuit and the first combined circuit respectively;

[0075] There are 6 electrode heating circuits. The heating elements in the furnace 17 include 8 Joule heating electrodes, namely E1, E2, E3, E4, E5, E6, E7 and E8, which are arranged at different heights and positions in the furnace 17 to form 6 electrode heating circuits, including the upper E1-E2 circuit (E1-E2 electrode heating) and the E3-E4 circuit (E3-E4 electrode heating); the middle and lower E5-E6 circuit (E5-E6 electrode heating), the lower and discharge position E7-E8 circuit (E7-E8 electrode heating), the auxiliary heating E5-E7 circuit (E5-E7 electrode heating) and the auxiliary heating E6-E7 circuit (E6-E7 electrode heating).

[0076] Since the startup heating and Joule heating are carried out in sequence, the ST05 loop, E5-E7 loop and E6-E7 loop are set as the first combination loop. The ST05 loop, E5-E7 loop and E6-E7 loop are hard-switched through the loop switching device 15, and soft-switched through the screen and control logic of the logic control system 1. Only one of the three loops can be output to the load in the furnace 17 at the same time; the loop switching device 15 is provided with a first switching loop for hard switching of the first combination loop; the loop switching device 15 can feed back the selection of the first switching loop to the logic control system 1; detailed logic programming is performed in the logic control system 1 to ensure that the first combination loop controlled by the logic control system 1 and the first switching loop of the loop switching device 15 select the same loop for switching output at the same time.

[0077] The ST01-ST04 loop and the E1-E2 loop are set as the second combination loop; the ST01-ST04 loop and the E1-E2 loop are hard-switched through the loop switching device 15, and soft-switched through the screen and control logic of the logic control system 1. The ST01-ST04 loop and the E1-E2 loop can only select one of them to be output to the load in the furnace 17 at the same time, and the loop switching device 15 is provided with a second switching loop for hard switching of the second combination loop; the loop switching device 15 can feed back the selection of the second switching loop to the logic control system 1, and detailed logic programming is performed in the logic control system 1 to ensure that the second combination loop controlled by the logic control system 1 and the second switching loop of the loop switching device 15 select the same loop for switching output at the same time.

[0078] The corresponding relationship between each heating circuit in the furnace 17 and each transformer in the electrical processing layer is shown in Table 2.

[0079] The first transformer 9 corresponds to the ST01-ST04 loop or the E1-E2 loop, and one of the two is selected for output;

[0080] The second transformer 10 corresponds to the E3-E4 loop;

[0081] The third transformer 11 corresponds to the E5-E6 loop;

[0082] The fourth transformer 12 corresponds to the E7-E8 loop;

[0083] The fifth transformer 13 corresponds to the E5-E7 loop, the E6-E7 loop or the ST05 loop, and one of the three is selected for output;

[0084] Table 2 Correspondence between the heating circuit of the furnace 17 and the equipment of the furnace electric control device

[0085]

[0086] like Figure 3 As shown, the present invention also discloses a furnace electronic control method for the furnace electronic control device as described above, comprising the following steps:

[0087] Step S1, start the heating stage, determine whether to select the silicon carbon rod heating circuit in the logic control system 1, select "yes" to enter step S2, select "no" to execute step S4;

[0088] Step S2, by switching the first switching circuit and the second switching circuit of the circuit switching device 15, the ST01-ST04 circuits in the second combined circuit and the ST05 circuit in the first combined circuit are put into operation (i.e., the ST01-ST04 and ST05 circuits are put into operation);

[0089] Step S3, starting the silicon carbon rod heating program corresponding to the ST01-ST04 loop and the ST05 loop;

[0090] Step S4, start the heating and end, and turn off the silicon carbon rod heating program;

[0091] Step S5, Joule heating stage, in the logic control system 1, it is determined whether to select the electrode heating circuit, if "yes" is selected, it goes to step S6, if "no" is selected, it goes to step S11;

[0092] Step S6, by switching the first switching circuit and the second switching circuit of the circuit switching device 15, the E1-E2 circuit in the E3-E4 circuit, the E5-E6 circuit and the second combination circuit is put into operation (i.e., the E1-E2, E3-E4, and E5-E6 circuits are put into operation);

[0093] Step S7, starting the electrode heating programs corresponding to the E1-E2 loop, the E3-E4 loop and the E5-E6 loop;

[0094] Step S8, determining in the logic control system 1 whether to select auxiliary discharge heating, if "yes" is selected, proceed to step S9, if "no" is selected, proceed to step S11;

[0095] Step S9, through the first switching circuit of the circuit switching device 15, the E5-E7 circuit or the E6-E7 circuit in the first combination circuit is put into operation (that is, the E5-E7 or E6-E7 circuit is put into operation);

[0096] Step S10, starting the electrode heating program corresponding to the E5-E7 loop or the E6-E7 loop (i.e., the auxiliary discharge electrode heating program);

[0097] Step S11, Joule heating ends and the electrode heating program is turned off.

[0098] Step S2, step S3, step S4, step S6, step S7, step S9, step S10 and step S11 can all be manually controlled and intervened by an operator to decide whether to continue the operation or end the operation.

[0099] like Figure 4 As shown, in step S1 and step S5, a selection process for the first combined loop and the second combined loop is also included, including the following steps:

[0100] Step S12, determining whether to emergency stop in the logic control system 1, if "yes" is selected, proceed to step S19, if "no" is selected, proceed to step S13;

[0101] Step S13, judging the current running state, when the running state is "starting heating stage", entering step S14, when the running state is "Joule heating stage", entering step S16, when the running state is neither "starting heating stage" nor "Joule heating stage", entering step S18;

[0102] Step S14, in the logic control system 1, it is determined whether the ST01-ST04 loop or the ST05 loop is put into operation (i.e., the ST01-ST04 or ST05 loop is put into operation). If "yes" is selected, the process proceeds to step S15, and if "no" is selected, the process proceeds to step S19;

[0103] Step S15, start the silicon carbon rod heating program corresponding to the ST01-ST04 loop or the ST05 loop, and then enter step S18;

[0104] Step S16, in the logic control system 1, it is determined whether the E1-E2 loop or the E5-E7 and E6-E7 loops are put into operation (i.e., the E1-E2 loop, the E5-E7 loop, the E6-E7 loop are put into operation). If "yes" is selected, the process proceeds to step S17, and if "no" is selected, the process proceeds to step S19;

[0105] Step S17, start the electrode heating program corresponding to the E1-E2 loop or the E5-E7 and E6-E7 loops, and then enter step S18;

[0106] Step S18, in the logic control system 1, the circuit selection logic of the silicon carbon rod heating program or the electrode heating program to be started is output to the circuit switching device 15, and the circuit switching device 15 completes the hard switching of the corresponding circuit, and then executes step S19; or after it is determined in step S13 that the operating state is neither the "start-up heating stage" nor the "Joule heating stage" (that is, it is in the non-operating state), step S18 selects to end the program and directly executes step S19;

[0107] Step S19, end.

[0108] The device described in the present invention is not limited to the embodiments described in the specific implementation manner. Those skilled in the art may derive other implementation manners based on the technical solution of the present invention, which also fall within the technical innovation scope of the present invention.

Claims

1. A furnace electric control device for controlling the operation of a furnace (17), characterized in that: It comprises an operation monitoring and logic processing layer and an electrical processing layer connected by a signal line, wherein the electrical processing layer is connected to the furnace (17) by a power line; the operation monitoring and logic processing layer is used to monitor the operation of the furnace (17), configure the program, and receive the voltage and current feedback signals of the electrical processing layer and perform control logic processing; the electrical processing layer is used to select and switch the control circuit that controls the operation of the furnace (17) according to the switching command signal of the operation monitoring and logic processing layer; The operation monitoring and logic processing layer includes a logic control system (1) for receiving feedback signals of the voltage and the current and performing control logic processing, and for sending the switching command signal to control the electrical processing layer to perform voltage regulation, which acts on the load of the furnace (17) so that the current follows the voltage conversion, thereby realizing the selective switching of the control loop for controlling the operation of the furnace (17); The electrical processing layer comprises a main electrical cabinet (2) connected to an external power supply (8), a first sub-electrical cabinet (3), a second sub-electrical cabinet (4), a third sub-electrical cabinet (5), a fourth sub-electrical cabinet (6) and a fifth sub-electrical cabinet (7) connected to the main electrical cabinet (2) via the power line; the main electrical cabinet (2), the first sub-electrical cabinet (3), the second sub-electrical cabinet (4), the third sub-electrical cabinet (5), the fourth sub-electrical cabinet (6) and the fifth sub-electrical cabinet (7) are respectively connected to the logic control system (1) via the signal line, and are used to send feedback signals of the voltage and the current to the logic control system (1); The electrical processing layer further includes a first transformer (9), a second transformer (10), a third transformer (11), a fourth transformer (12), a fifth transformer (13), a loop switching device (15) and an electrical busbar (16); The first transformer (9) is connected to the first electrical sub-cabinet (3), the circuit switching device (15) and the electrical busbar (16) respectively through the power lines; The second transformer (10) is connected to the second electrical sub-cabinet (4) and the electrical busbar (16) respectively through the power lines; The third transformer (11) is connected to the third electrical sub-cabinet (5) and the circuit switching device (15) respectively through the power lines; The fourth transformer (12) is connected to the fourth electrical sub-cabinet (6) and the circuit switching device (15) respectively through the power lines; The fifth transformer (13) is connected to the fifth electrical sub-cabinet (7) and the circuit switching device (15) respectively through the power lines; The first transformer (9), the second transformer (10), the third transformer (11), the fourth transformer (12) and the fifth transformer (13) are also respectively connected to the logic control system (1) via the signal line, and are used to send feedback signals of the voltage and the current to the logic control system (1); The circuit switching device (15) is connected to the electrical busbar (16) via the power line, and is also connected to the logic control system (1) via the signal line, and is used to receive the switching instruction signal sent by the logic control system (1), select and switch the control circuit that controls the operation of the furnace (17), and realize the control of different heating circuits of the furnace (17); The electrical busbar (16) is connected to the furnace (17) via the power line and is used to output a control current to a heating element or a heating circuit in the furnace (17); The heating circuit of the furnace (17) comprises a silicon carbon rod heating circuit and an electrode heating circuit; the silicon carbon rod heating circuit is used for heating the furnace (17) during the startup phase, raising the temperature from room temperature to an allowable operating temperature range and maintaining the temperature; the electrode heating circuit is used for performing Joule heating on the furnace (17) during the operation phase after the startup phase, and controlling the temperature within the operating range according to the process operation requirements; There are two silicon carbon rod heating circuits, including ST01-ST04 circuits and ST05 circuits using silicon carbon rods; There are six electrode heating circuits, and the heating elements in the furnace (17) include eight Joule heating electrodes, namely E1, E2, E3, E4, E5, E6, E7 and E8, which are arranged at different heights and positions in the furnace (17) to form six electrode heating circuits, including an E1-E2 circuit and an E3-E4 circuit at the top; an E5-E6 circuit at the middle and lower part, an E7-E8 circuit at the lower part and at the discharge position, an E5-E7 circuit during auxiliary discharge, and an E6-E7 circuit during auxiliary discharge; The ST05 loop, the E5-E7 loop and the E6-E7 loop are set as a first combination loop. The ST05 loop, the E5-E7 loop and the E6-E7 loop are hard-switched through the loop switching device (15) and soft-switched through the screen and control logic of the logic control system (1). Only one of the three loops can be selected to output to the load in the furnace (17) at the same time. The loop switching device (15) is provided with a first switching loop for hard-switching the first combination loop. The loop switching device (15) can feed back the selection of the first switching loop to the logic control system (1). Logic programming is performed in the logic control system (1) to ensure that the first combination loop controlled by the logic control system (1) and the loop selected to be switched output by the first switching loop of the loop switching device (15) are the same loop at the same time.

2. The electric control device for a melting furnace according to claim 1, characterized in that: The ST01-ST04 loop and the E1-E2 loop are set as a second combination loop; the ST01-ST04 loop and the E1-E2 loop are hard-switched through the loop switching device (15), and soft-switched through the screen and control logic of the logic control system (1); the ST01-ST04 loop and the E1-E2 loop can only select one of them to output to the load in the furnace (17) at the same time; the loop switching device (15) is provided with a second switching loop for hard switching the second combination loop; the loop switching device (15) can feed back the selection of the second switching loop to the logic control system (1); logic programming is performed in the logic control system (1) to ensure that the second combination loop controlled by the logic control system (1) and the loop selected to switch output by the second switching loop of the loop switching device (15) are the same loop at the same time.

3. A furnace electronic control method for a furnace electronic control device as claimed in claim 2, comprising the following steps: Step S1, starting the heating phase, determining in the logic control system (1) whether to select the silicon carbon rod heating circuit, if "yes" is selected, proceeding to step S2, if "no" is selected, executing step S4; Step S2, by switching the first switching circuit and the second switching circuit of the circuit switching device (15), the ST01-ST04 circuits in the second combined circuit and the ST05 circuit in the first combined circuit are put into operation; Step S3, starting the silicon carbon rod heating program corresponding to the ST01-ST04 loop and the ST05 loop; Step S4, start the heating and end, and close the silicon carbon rod heating program; Step S5, Joule heating stage, determining whether the electrode heating circuit is selected in the logic control system (1), if "yes" is selected, proceeding to step S6, if "no" is selected, executing step S11; Step S6, by switching the first switching circuit and the second switching circuit of the circuit switching device (15), the E3-E4 circuit, the E5-E6 circuit and the E1-E2 circuit in the second combined circuit are put into operation; Step S7, starting the electrode heating programs corresponding to the E1-E2 loop, the E3-E4 loop and the E5-E6 loop; Step S8, determining whether to select auxiliary discharge heating in the logic control system (1), if "yes" is selected, proceeding to step S9, if "no" is selected, executing step S11; Step S9, putting the E5-E7 circuit or the E6-E7 circuit in the first combined circuit into operation through the first switching circuit of the circuit switching device (15); Step S10, starting the electrode heating program corresponding to the E5-E7 loop or the E6-E7 loop; Step S11, Joule heating ends and the electrode heating program is turned off.

4. The method according to claim 3, characterized in that: The step S2, the step S3, the step S4, the step S6, the step S7, the step S9, the step S10 and the step S11 can all be manually controlled and intervened by an operator to decide whether to continue the operation or end the operation.

5. The method according to claim 4, wherein The step S1 and the step S5 also include a selection process for the first combined loop and the second combined loop, including the following steps: Step S12, determining whether an emergency stop is to be performed in the logic control system (1), if "yes" is selected, then the process proceeds to step S19, if "no" is selected, then the process proceeds to step S13; Step S13, judging the current running state, when the running state is "starting heating stage", proceeding to step S14, when the running state is "Joule heating stage", proceeding to step S16, when the running state is neither "starting heating stage" nor "Joule heating stage", proceeding to step S18; Step S14, determining in the logic control system (1) whether to put the ST01-ST04 loop or the ST05 loop into operation, if "yes" is selected, proceeding to step S15, if "no" is selected, executing step S19; Step S15, starting the silicon carbon rod heating program corresponding to the ST01-ST04 loop or the ST05 loop, and then entering step S18; Step S16, determining in the logic control system (1) whether to put the E1-E2 loop or the E5-E7 and the E6-E7 loop into operation, if "yes" is selected, proceeding to step S17, if "no" is selected, executing step S19; Step S17, starting the electrode heating program corresponding to the E1-E2 loop or the E5-E7 and the E6-E7 loop, and then entering step S18; Step S18, in the logic control system (1), the circuit selection logic of the silicon carbon rod heating program or the electrode heating program to be started is output to the circuit switching device (15), and the circuit switching device (15) completes the hard switching of the corresponding circuit, and then executes step S19; or after the step S13 determines that the operating state is neither the "start-up heating stage" nor the "Joule heating stage", the step S18 selects to end the program and directly executes step S19; Step S19, end.

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