CN116224890A - Dust removal control circuit and control method for steelmaking furnace - Google Patents

Dust removal control circuit and control method for steelmaking furnace Download PDF

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Publication number
CN116224890A
CN116224890A CN202310472893.9A CN202310472893A CN116224890A CN 116224890 A CN116224890 A CN 116224890A CN 202310472893 A CN202310472893 A CN 202310472893A CN 116224890 A CN116224890 A CN 116224890A
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resistor
operational amplifier
triode
nmos tube
electrode
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CN116224890B (en
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袁保宁
罗涌
孙江涛
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Wuxi Dongxiong Heavy Arc Furnace Co ltd
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Wuxi Dongxiong Heavy Arc Furnace Co ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/24—Pc safety
    • G05B2219/24215—Scada supervisory control and data acquisition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electronic Switches (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The invention discloses a dust removal control circuit and a dust removal control method for a steelmaking furnace, which belong to the technical field of steelmaking equipment and comprise a first input end, a first output end, a first relay, a first capacitor, a first operational amplifier, a second operational amplifier, a third operational amplifier, a first resistor, a second resistor, a first phototriode, a second light emitting diode, a third light emitting diode and a fourth phototriode, wherein the first input end is connected with an in-phase end and one end of the first resistor of the first operational amplifier. When the invention removes dust in a blast furnace working area, the problems that the operation power of the negative pressure vacuum dust removing equipment cannot timely meet the excessive power consumption caused by the refining dust removing requirement of the blast furnace and the workshop dust is caused by incomplete treatment are solved.

Description

Dust removal control circuit and control method for steelmaking furnace
Technical Field
The invention relates to the technical field of steelmaking equipment, in particular to a dust removal control circuit of a steelmaking furnace.
Background
To the blast furnace work area dust removal measure of iron and steel factory, easily cause secondary pollution when the clearance is not thorough, increase the degree of difficulty of enterprise's later stage dust removal, in order to solve secondary pollution problem, current refinery can adopt the mode of negative pressure dust removal, compare in traditional sack dust removal and the mode of air-blower dust removal, possess and inhale the removal at the blast furnace waste gas negative pressure in the period of not drifting, but because negative pressure vacuum dust removal can receive the influence of blast furnace process factor, blast furnace area produces a large amount of dust and receives the influence of heat and air convection in the during operation, can drift to workshop everywhere, because the high of arranging in blast furnace top of vacuum dust removal mouth is certain restriction, and the power of equipment operation can't satisfy the dust removal demand of blast furnace refining in good time, the incomplete of processing leads to the workshop laying dust, the publication number: CN106406148A discloses a linkage control circuit for a dust remover fan, which can control the fan to stop running in time according to the air pressure difference of the inner side and the outer side of a filter element and the air pressure of compressed air in an air storage tank, but the circuit cannot control the linkage of dust removing equipment and the running power of a blast furnace, and the linkage of the dust concentration generated by the blast furnace and the dust removing equipment.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a dust removal control circuit of a steelmaking furnace, which comprises a control module, wherein the control module comprises a first input end IN1, a first output end OUT1, a first relay K1, a first capacitor C1, a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a first resistor R1, a second resistor R2, a first phototriode D1, a second light emitting diode D2, a third light emitting diode D3 and a fourth phototriode D4, the first input end IN1 is connected with the same phase end of the first operational amplifier U1 and one end of the first resistor R1, the output end of the first operational amplifier U1 is connected with a coil of the first relay K1, the first phototriode D1 is coupled and packaged with the third light emitting diode D3, a collector of the first phototriode D1 is connected with the other end of the first resistor R1, the emitter of the first phototriode D1 is connected with one end of a normally open contact of the first relay K1, the other end of the normally open contact of the first relay K1 is connected with one end of a second resistor R2, one end of a first capacitor C1, the reverse phase end of a third operational amplifier U3, the IN-phase end of the second operational amplifier U2 is connected, the other end of the second resistor R2, the other end of the first capacitor C1 is connected with a grounding end, the output end of the second operational amplifier U2 is connected with the anode of a second light emitting diode D2, the second light emitting diode D2 is coupled and packaged with a fourth phototriode D4, the collector of the fourth phototriode D4 is connected with a power supply, the emitter of the fourth phototriode D4 is connected with a first output end OUT1, the output end of the third operational amplifier U3 is connected with the anode of the third light emitting diode D3, the cathode of the second light emitting diode D2, the third light emitting diode D3 is connected with the grounding end, the first input end is used for obtaining a dust concentration signal of the steelmaking furnace, the inverting terminal of the first operational amplifier is used for setting a dust removal threshold signal, and the first output terminal outputs a pulse signal of the operating frequency of dust removal equipment.
Further, the control module further includes a third resistor R3, a fourth potentiometer R4, a fifth resistor R5, a sixth resistor R6, a fifth NMOS transistor D5, a sixth NMOS transistor D6, a seventh triode D7, and an eighth triode D8, where one end of the third resistor R3, one end of the fourth potentiometer R4, and a power supply are connected, the other end of the third resistor R3 is connected to a source of the sixth NMOS transistor D6 and a collector of the seventh triode D7, a drain of the sixth NMOS transistor D6 is connected to a drain of the fifth NMOS transistor D5, a gate of the sixth NMOS transistor D6 is connected to an output of the third operational amplifier U3, a gate of the fifth NMOS transistor D5 is connected to an output of the second operational amplifier U2, a source of the fifth NMOS transistor D5 is connected to a base of the second light emitting diode D2, an eighth triode D5, another end of the eighth triode D8 is connected to a base of the seventh triode D7, another end of the eighth resistor R8 is connected to one end of the sixth NMOS transistor R6, another end of the sixth NMOS transistor R6 is connected to a drain of the seventh triode D7, and an emitter is connected to the drain of the eighth triode D8.
Further, the control module further comprises a seventh resistor R7, an eighth resistor R8, a ninth triode D9, a tenth PMOS tube D10 and a second capacitor C2, wherein one end of the seventh resistor R7 is connected with one end of the eighth resistor R8 and the emitter of the ninth triode D9, the base of the ninth triode D9 is connected with the output end of the first operational amplifier U1, the collector of the ninth triode D9 is connected with a power supply, the other end of the eighth resistor R8 is connected with one end of the second capacitor C2 and the grid of the tenth PMOS tube D10, the drain of the tenth PMOS tube D10 is connected with the coil of the first relay K1, the source of the tenth PMOS tube D10 is connected with the power supply, and the other end of the seventh resistor R7 and the other end of the second capacitor C2 are connected with the ground.
Further, the control module further comprises a ninth resistor R9 and a tenth resistor R10, one end of the ninth resistor R9 is connected with a power supply, the other end of the ninth resistor R9 is connected with the inverting end of the first operational amplifier U1 and one end of the tenth resistor R10, and the other end of the tenth resistor R10, the tap end of the tenth resistor R10 and the grounding end are connected.
Further, the control module further comprises an eleventh resistor R11, a twelfth resistor R12 and a thirteenth resistor R13, one end of the eleventh resistor R11 is connected with a power supply, the other end of the eleventh resistor R11 is connected with the inverting end of the second operational amplifier U2 and one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is connected with the same-phase end of the third operational amplifier U3 and one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected with a grounding end.
Further, the control module further includes a fourteenth resistor R14 and a fifteenth resistor R15, where one end of the fourteenth resistor R14 is connected to the gate of the fifth NMOS tube D5, one end of the fifteenth resistor R15 is connected to the gate of the sixth NMOS tube D6, and the other end of the fourteenth resistor R14, the other end of the fifteenth resistor R15, and the ground end are connected.
Further, the control module further comprises a sixteenth resistor R16 and a seventeenth resistor R17, one end of the sixteenth resistor R16 is connected with a power supply, the other end of the sixteenth resistor R16 is connected with one end of the seventeenth resistor R17, the drain electrode of the fifth NMOS tube D5 and the drain electrode of the sixth NMOS tube D6, and the other end of the seventeenth resistor R17 is connected with a ground terminal.
Further, the control module further comprises an eighteenth resistor R18 and a nineteenth resistor R19, one end of the eighteenth resistor R18 is connected with a power supply, the other end of the eighteenth resistor R18 is connected with the source electrode of the tenth PMOS tube D10, one end of the nineteenth resistor R19, and the other end of the nineteenth resistor R19 is connected with a grounding end.
Further, the control method provided with the dust removal control circuit of the steelmaking furnace comprises the following steps:
step 1: setting a consistent negative pressure dust removing device according to the maximum load of the refining furnace;
step 2: setting a dust concentration dedusting threshold value and building a step speed regulation database;
step 3: setting a sampling resistor for a motor of the refining furnace;
step 4: and performing power grading on the dust removing equipment based on the current data of the resistor sampling.
Compared with the prior art, the invention has the beneficial effects that:
the device has the function of matching the dust removal operating power according to the blast furnace operating power, effectively reduces the output loss of pulse signals of the negative pressure vacuum motor, and prevents the problem of over-high starting sensitivity caused by deviation of concentration measurement due to scattered heat and uneven particle astigmatism in the air when the infrared dust sensor is adopted to acquire the concentration signal.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a first part of a schematic control module structure provided by the present invention, fig. 2 is a second part of a schematic control module structure provided by the present invention, and fig. 3 is a third part of a schematic control module structure provided by the present invention.
Detailed Description
In order that the objects and advantages of the invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific examples that are given below, it being understood that the appended drawings are only intended to illustrate one or more specific embodiments of the invention and are not to be construed as critical limits of the scope of the invention.
Referring to the drawings, the invention relates to a dust removal control circuit of a steelmaking furnace, which comprises a control module, wherein the control module comprises a first input end IN1, a first output end OUT1, a first relay K1, a first capacitor C1, a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a first resistor R1, a second resistor R2, a first phototriode D1, a second light emitting diode D2, a third light emitting diode D3 and a fourth phototriode D4, the first input end IN1 is connected with the same-phase end of the first operational amplifier U1 and one end of the first resistor R1, the output end of the first operational amplifier U1 is connected with a coil of the first relay K1, the first phototriode D1 is coupled and packaged with the third light emitting diode D3, the collector of the first phototriode D1 is connected with the other end of the first resistor R1, the emitter of the first phototriode D1 is connected with one end of a normally open contact of the first relay K1, the other end of the normally open contact of the first relay K1 is connected with one end of a second resistor R2, one end of a first capacitor C1, the inverting end of a third operational amplifier U3 and the non-inverting end of the second operational amplifier U2, the other end of the second resistor R2 and the other end of the first capacitor C1 are connected with a grounding end, the output end of the second operational amplifier U2 is connected with the anode of a second light emitting diode D2, the second light emitting diode D2 is coupled and packaged with a fourth phototriode D4, the collector of the fourth phototriode D4 is connected with a power supply, the emitter of the fourth phototriode D4 is connected with a first output end OUT1, the output end of the third operational amplifier U3 is connected with the anode of the third light emitting diode D3, the cathode of the second light emitting diode D2, the cathode of the third light emitting diode D3 and the grounding end are connected, the first input end is used for obtaining dust concentration signals of the steelmaking furnace, the inverting end of the first operational amplifier is used for setting dust removal threshold signals, the first output end outputs a pulse signal of the operation frequency of the dust removing equipment.
Specifically, the control module further comprises a third resistor R3, a fourth potentiometer R4, a fifth resistor R5, a sixth resistor R6, a fifth NMOS tube D5, a sixth NMOS tube D6, a seventh triode D7 and an eighth triode D8, wherein one end of the third resistor R3, one end of the fourth potentiometer R4 are connected with a power supply, the other end of the third resistor R3 is connected with a source electrode of the sixth NMOS tube D6 and a collector electrode of the seventh triode D7, a drain electrode of the sixth NMOS tube D6 is connected with a drain electrode of the fifth NMOS tube D5, a grid electrode of the sixth NMOS tube D6 is connected with an output end of the third operational amplifier U3, a grid electrode of the fifth NMOS tube D5 is connected with an output end of the second operational amplifier U2, a source electrode of the fifth NMOS tube D5 is connected with a base electrode of the second light emitting diode D2, one end of the fifth triode D5, one end of the eighth triode D8 is connected with a base electrode of the seventh triode D7, one end of the eighth triode D8 is connected with one end of the sixth NMOS tube D6, the other end of the sixth NMOS tube D6 is connected with the base electrode of the seventh triode D7, and the emitter end of the eighth triode D8 is connected with the emitter end of the seventh triode D7.
Specifically, the control module further comprises a seventh resistor R7, an eighth resistor R8, a ninth triode D9, a tenth PMOS tube D10 and a second capacitor C2, wherein one end of the seventh resistor R7 is connected with one end of the eighth resistor R8 and the emitter of the ninth triode D9, the base of the ninth triode D9 is connected with the output end of the first operational amplifier U1, the collector of the ninth triode D9 is connected with a power supply, the other end of the eighth resistor R8 is connected with one end of the second capacitor C2 and the grid of the tenth PMOS tube D10, the drain of the tenth PMOS tube D10 is connected with the coil of the first relay K1, the source of the tenth PMOS tube D10 is connected with the power supply, and the other end of the seventh resistor R7 and the other end of the second capacitor C2 are connected with the ground.
Specifically, the control module further comprises a ninth resistor R9 and a tenth resistor R10, one end of the ninth resistor R9 is connected with a power supply, the other end of the ninth resistor R9 is connected with the inverting end of the first operational amplifier U1 and one end of the tenth resistor R10, and the other end of the tenth resistor R10 and the tap end of the tenth resistor R10 are connected with a ground terminal.
Specifically, the control module further comprises an eleventh resistor R11, a twelfth resistor R12 and a thirteenth resistor R13, one end of the eleventh resistor R11 is connected with a power supply, the other end of the eleventh resistor R11 is connected with the inverting end of the second operational amplifier U2, one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is connected with the same-phase end of the third operational amplifier U3, one end of the thirteenth resistor R13 is connected with the other end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected with the grounding end.
Specifically, the control module further comprises a fourteenth resistor R14 and a fifteenth resistor R15, one end of the fourteenth resistor R14 is connected with the grid of the fifth NMOS tube D5, one end of the fifteenth resistor R15 is connected with the grid of the sixth NMOS tube D6, and the other end of the fourteenth resistor R14 and the other end of the fifteenth resistor R15 are connected with the ground;
specifically, the control module further comprises a sixteenth resistor R16 and a seventeenth resistor R17, one end of the sixteenth resistor R16 is connected with a power supply, the other end of the sixteenth resistor R16 is connected with one end of the seventeenth resistor R17, the drain electrode of the fifth NMOS tube D5 and the drain electrode of the sixth NMOS tube D6, and the other end of the seventeenth resistor R17 is connected with a ground terminal;
specifically, the control module further comprises an eighteenth resistor R18 and a nineteenth resistor R19, one end of the eighteenth resistor R18 is connected with a power supply, the other end of the eighteenth resistor R18 is connected with a source electrode of the tenth PMOS tube D10, one end of the nineteenth resistor R19 is connected, and the other end of the nineteenth resistor R19 is connected with a grounding end.
Specifically, the control method provided with the dust removal control circuit of the steelmaking furnace comprises the following steps:
step 1: setting a consistent negative pressure dust removing device according to the maximum load of the refining furnace;
step 2: setting a dust concentration dedusting threshold value and building a step speed regulation database;
step 3: setting a sampling resistor for a motor of the refining furnace;
step 4: and performing power grading on the dust removing equipment based on the current data of the resistor sampling.
The working principle of the invention; the first input end IN1 is a dust concentration signal, the inverting end of the first operational amplifier U1 is used for setting a dust removal threshold signal, the non-inverting end of the first operational amplifier U1 receives a voltage signal fed back by the first input end IN1, the first resistor R1 is used for sampling a current signal fed back by the first input end IN1, the first relay K1 is attracted after exceeding the threshold signal of the first operational amplifier U1, the sampling signal fed back by the first resistor R1 is connected to the first capacitor C1 through a normally closed contact of the first relay K1, the second operational amplifier U2 and the third operational amplifier U3 regulate the signal frequencies output by the second operational amplifier U2 and the third operational amplifier U3 based on the current signal received by the first capacitor C1, the second light emitting diode D2 and the fourth phototriode D4 are coupled and isolated by signals, the first output end OUT1 is a pulse signal of the operation frequency of the dust removing equipment, the first phototriode D1 and the third light emitting diode D3 are coupled and isolated by signals, the signals are fed back to the first phototriode D1 for circulation, when the operation power of the blast furnace is changed, the concentration of the first input end IN1 is changed, the current parameter sampled by the first resistor R1 is changed to change the charging and discharging interval of the first capacitor C1, and then the first output end OUT1 outputs pulse signals with different frequencies, so that the dust removing operation power is matched according to the operation power of the blast furnace; the inverting terminal of the first operational amplifier U1 is connected with a reference voltage, the reference voltage is used for setting a threshold value signal of the first operational amplifier U1, the non-inverting terminal of the first operational amplifier U1 receives a voltage signal fed back by a first input end IN1, when dust concentration is higher than a preset value, the signal of the output end of the first operational amplifier U1 enables a coil of a first relay K1 to be attracted, a normally open contact of the first relay K1 is closed, the signal of the first input end IN1 reaches a first capacitor C1 through a first resistor R1, a first phototriode D1 and a normally open contact of the first relay K1, the non-inverting terminal of the first capacitor C1 is connected with a non-inverting terminal of a second operational amplifier U2 and a non-inverting terminal of a third operational amplifier U3, when the potential of the first capacitor C1 rises, the output of the second operational amplifier U2 and the third operational amplifier U3 is reversed, no signal of the third operational amplifier U3 passes through a third light emitting diode D3, because the third light emitting diode D3 and the first phototransistor D1 are coupled and output, the first capacitor C1 is disconnected by the first phototransistor D1 and released, and the signal output by the second operational amplifier U2 is coupled by the second light emitting diode D2 and the fourth phototransistor D4, the first output terminal OUT1 outputs a high level signal, whereas the first output terminal OUT1 outputs a low level signal, and the first output terminal OUT1 outputs pulse signals with different operating frequencies of dust removing devices according to the magnitude of the sampling parameter of the first resistor R1, it should be noted that at this time, the static working state of the auxiliary contact of the first relay K1 needs to be set as a normally open contact, that is, a circuit connected with the auxiliary contact of the first relay K1 needs to be connected to the normally open auxiliary contact of the first relay K1.
In order to prevent the power factor loss of the control module from being too large, after the signal at the output end of the second operational amplifier U2 reaches the grid electrode of the fifth NMOS tube D5 to lead the fifth NMOS tube D5 to be conducted, the power signal at the drain end of the fifth NMOS tube D5 reaches the base electrode of the seventh triode D7 through the fifth resistor R5 at the same time, the power signal at the end of the third resistor R3 is conducted through the seventh triode D7, the loop of the original loop third resistor R3, the sixth resistor R6, the base electrode of the eighth resistor R8, the emitter electrode of the eighth resistor R8 and the grounding end is changed into the loop of the third resistor R3, the collector electrode of the seventh triode D7, the emitter electrode of the seventh triode D7 and the grounding end, when the output end of the second operational amplifier U2 does not output signals, the anode potential conducted by the second LED D2 is lower than the potential of the base electrode of the seventh triode D7 which is reached through the fourth potentiometer R4 and the fifth resistor R5, the tap end of the fourth potentiometer is used for sampling the current of the power supply, or the common resistor in the drawing can be directly adopted, the second light emitting diode D2 and the fourth phototriode D4 are continuously coupled, the first output end OUT1 outputs a high-level signal, when the output end of the third operational amplifier U3 outputs the signal, the signal reaches the grid electrode of the sixth NMOS tube D6, after the sixth NMOS tube D6 is conducted, the power supply signal at the drain electrode end of the sixth NMOS tube D6 reaches the base electrode of the eighth triode D8 through the third light emitting diode D3 and the sixth resistor R6, the eighth triode D8 is conducted, the conducted potential of the second light emitting diode D2 is lower than the potential from the collector electrode of the eighth triode D8 and the emitter electrode of the eighth triode D8 to the grounding end, and the loop of the power supply signal at the end of the fourth potentiometer R4 is the power supply signal at the end of the fourth potentiometer R4, the fourth potentiometer R4 and the collector electrode of the eighth triode D8, the emitter of the eighth triode D8 and the grounding end, the second light emitting diode D2 is cut off, the first output end OUT1 outputs a low-level signal, the coupling of the third light emitting diode D3 and the first phototransistor D1 enables a current signal sampled by the first resistor R1 end to continuously reach the first capacitor C1 end through a normally open contact of the first relay K1 for circulation, the second resistor R2 is used for releasing when the first phototransistor D1 is cut off, and the output loss of pulse signals of the first output end OUT1 is reduced because the seventh triode D7 and the eighth triode D8 alternately output during the period when signals of the second operational amplifier U2 and the third operational amplifier U3 are not output.
Considering that when the first input end IN1 acquires a concentration signal by adopting an infrared dust sensor, concentration measurement deviation can be caused by uneven heating of the concentration signal, dust collection equipment is switched on by mistake, an eighth resistor R8 and a second capacitor C2 are arranged to delay a signal output by a second operational amplifier U2, when the deviation time is longer than the capacity of the second capacitor C2, a tenth PMOS tube D10 is cut off, a normally closed contact of the first relay K1 is closed, and the fact that the static working state of an auxiliary contact of the first relay K1 needs to be set to be the normally closed contact, namely a circuit connected with the auxiliary contact of the first relay K1 needs to be connected to the normally closed auxiliary contact of the first relay K1; the seventh resistor R7 is used for pulling up a signal output by an emitter of the ninth triode D9, when a signal acquired by the first input end IN1 deviates, the output end of the first operational amplifier U1 outputs a signal to enable the ninth triode D9 to be conducted, a power signal of a collector of the ninth triode D9 reaches a grid electrode of the second capacitor C2 and the tenth PMOS transistor D10 through the emitter of the ninth triode D9 and the eighth resistor R8, the second capacitor C2 and the ninth triode D9 delay, after the first operational amplifier U1 continuously outputs, the positive pressure difference from the grid electrode to the source electrode of the tenth PMOS transistor D10 is cut off, or the negative pressure difference is not achieved, the tenth PMOS transistor D10 is cut off, the normally closed contact of the first relay K1 is closed, the first resistor R1 samples a current signal of the first input end IN1 and then feeds back to a post circuit, otherwise, when the first input end IN1 is not subjected to dust removal by measuring the deviation, the tenth PMOS transistor D10 is subjected to reflux through the eighth resistor R8, the grounding end of the second capacitor C2, the normally closed contact of the tenth PMOS transistor D10 is IN a state, and the normally closed contact of the first relay K1 is opened, and the first relay K1 is IN a state, and the normally closed contact state is opened.
Adjusting the tenth resistor R10 knob changes the threshold signal voltage magnitude at the inverting terminal of the first operational amplifier U1.
The eleventh resistor R11, the twelfth resistor R12, and the thirteenth resistor R13 are used for providing reference potentials for the second operational amplifier U2 and the third operational amplifier U3, and changing the ratio of the resistance values of the eleventh resistor R11, the twelfth resistor R12, and the thirteenth resistor R13 can change the amplitude of the transition interval between the second operational amplifier U2 and the third operational amplifier U3, and it should be noted that different power supplies can also be provided for the second operational amplifier U2 and the third operational amplifier U3.
The fourteenth resistor R14 and the fifteenth resistor R15 are used for discharging parasitic capacitance of the fifth NMOS transistor D5 and the sixth NMOS transistor D6, and preventing the parasitic oscillation from damaging the subsequent circuit.
The sixteenth resistor R16 and the seventeenth resistor R17 are connected in series and divided to supply power to the drains of the fifth NMOS tube D5 and the sixth NMOS tube D6, so that the output end potentials of the second operational amplifier U2 and the third operational amplifier U3 cannot be conducted when the output end potentials of the second operational amplifier U2 and the third operational amplifier U3 are lower than the drains of the fifth NMOS tube D5 and the sixth NMOS tube D6.

Claims (9)

1. The dust removal control circuit of the steelmaking furnace comprises a control module and is characterized in that the control module comprises a first input end, a first output end, a first relay, a first capacitor, a first operational amplifier, a second operational amplifier, a third operational amplifier, a first resistor, a second resistor, a first photoelectric triode, a second light-emitting diode, a third light-emitting diode and a fourth photoelectric triode, wherein the first input end is connected with the same phase end of the first operational amplifier and one end of the first resistor, the output end of the first operational amplifier is connected with a coil of the first relay, the first photoelectric triode is packaged in a coupling way with a third light-emitting diode, a collector electrode of the first photoelectric triode is connected with the other end of the first resistor, an emitter electrode of the first photoelectric triode is connected with one end of a normally open contact of the first relay, the other end of the normally open contact of the first relay is connected with one end of the second resistor, one end of the first capacitor, one end of the third operational amplifier is connected with an inverting end of the second operational amplifier, the second light-emitting diode is connected with the other end of the second resistor, the other end of the first capacitor is connected with a grounding end, the output end of the second operational amplifier is connected with an anode of the second light-emitting diode and the second light-emitting diode, the second light-emitting diode is connected with the anode end of the fourth photoelectric amplifier and the third light-emitting diode is connected with the anode, the fourth photoelectric amplifier is connected with the anode, the output end of the fourth photoelectric amplifier is connected with the cathode, the cathode is connected with the signal of the first photoelectric amplifier, the cathode is connected with the cathode, the signal of the first output end of the fourth photoelectric amplifier, the dust collector is connected with the cathode, and the dust collector is connected with the signal of the dust collector, and the dust collector is connected.
2. The dust removal control circuit of a steelmaking furnace according to claim 1, wherein the control module further comprises a third resistor, a fourth potentiometer, a fifth resistor, a sixth resistor, a fifth NMOS tube, a sixth NMOS tube, a seventh triode and an eighth triode, one end of the third resistor, one end of the fourth potentiometer are connected with a power supply, the other end of the third resistor is connected with a source electrode of the sixth NMOS tube and a collector electrode of the seventh triode, a drain electrode of the sixth NMOS tube is connected with a drain electrode of the fifth NMOS tube, a grid electrode of the sixth NMOS tube is connected with an output end of a third operational amplifier, a grid electrode of the fifth NMOS tube is connected with an output end of the second operational amplifier, a source electrode of the fifth NMOS tube is connected with an anode of the second light emitting diode, one end of the fifth resistor and a collector electrode of the eighth triode, the other end of the fifth resistor is connected with a base electrode of the seventh triode, a base electrode of the eighth triode is connected with one end of the sixth resistor, the other end of the sixth resistor is connected with a source electrode of the sixth NMOS tube, an emitter electrode of the seventh triode, an emitter of the eighth triode is connected with a ground end of the eighth triode.
3. The dust removal control circuit of a steelmaking furnace according to claim 1, wherein the control module further comprises a seventh resistor, an eighth resistor, a ninth triode, a tenth PMOS tube and a second capacitor, one end of the seventh resistor is connected with one end of the eighth resistor, an emitter of the ninth triode, a base of the ninth triode is connected with the output end of the first operational amplifier, a collector of the ninth triode is connected with a power supply, the other end of the eighth resistor is connected with one end of the second capacitor, a grid of the tenth PMOS tube, a drain of the tenth PMOS tube is connected with a first relay coil, a source of the tenth PMOS tube is connected with the power supply, and the other end of the seventh resistor, the other end of the second capacitor and a ground end are connected.
4. The dust removal control circuit of a steelmaking furnace according to claim 1, wherein the control module further comprises a ninth resistor and a tenth resistor, one end of the ninth resistor is connected with a power supply, the other end of the ninth resistor is connected with the inverting end of the first operational amplifier and one end of the tenth resistor, and the other end of the tenth resistor, the tap end of the tenth resistor and the ground end are connected.
5. The dust removal control circuit of a steelmaking furnace according to claim 1, wherein the control module further comprises an eleventh resistor, a twelfth resistor and a thirteenth resistor, one end of the eleventh resistor is connected with the power supply, the other end of the eleventh resistor is connected with the inverting end of the second operational amplifier and one end of the twelfth resistor, the other end of the twelfth resistor is connected with the same-phase end of the third operational amplifier and one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected with the ground.
6. The dust removal control circuit of a steelmaking furnace according to claim 2, wherein the control module further comprises a fourteenth resistor and a fifteenth resistor, one end of the fourteenth resistor is connected with the grid electrode of the fifth NMOS tube, one end of the fifteenth resistor is connected with the grid electrode of the sixth NMOS tube, and the other end of the fourteenth resistor and the other end of the fifteenth resistor are connected with the ground terminal.
7. The dust removal control circuit of a steelmaking furnace according to claim 2, wherein the control module further comprises a sixteenth resistor and a seventeenth resistor, one end of the sixteenth resistor is connected with a power supply, the other end of the sixteenth resistor is connected with one end of the seventeenth resistor, the drain electrode of the fifth NMOS tube and the drain electrode of the sixth NMOS tube, and the other end of the seventeenth resistor is connected with a grounding end.
8. A dust removal control circuit for a steelmaking furnace according to claim 3, wherein the control module further comprises an eighteenth resistor and a nineteenth resistor, one end of the eighteenth resistor is connected with a power supply, the other end of the eighteenth resistor is connected with a source electrode of a tenth PMOS tube and one end of the nineteenth resistor, and the other end of the nineteenth resistor is connected with a ground terminal.
9. A control method for controlling a dust removal control circuit for a steel-making furnace according to any one of claims 1 to 8:
step 1: setting a consistent negative pressure dust removing device according to the maximum load of the refining furnace;
step 2: setting a dust concentration dedusting threshold value and building a step speed regulation database;
step 3: setting a sampling resistor for a motor of the refining furnace;
step 4: and performing power grading on the dust removing equipment based on the current data of the resistor sampling.
CN202310472893.9A 2023-04-28 2023-04-28 Dust removal control circuit and control method for steelmaking furnace Active CN116224890B (en)

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DE102008056938A1 (en) * 2008-08-22 2010-02-25 Frieters, Oliver Dust exhausting equipment controlling method for industry, involves calculating dust quantity per unit volume, and automatically triggering action during exceeding of permissible dust quantity per unit volume using controller
CN103047165A (en) * 2013-01-08 2013-04-17 浙江大学 Control method and control system for dust removal fan of smelting furnace
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116566346A (en) * 2023-07-05 2023-08-08 北京炎黄国芯科技有限公司 Adaptive gain amplifier
CN116566346B (en) * 2023-07-05 2024-02-06 北京炎黄国芯科技有限公司 Adaptive gain amplifier

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