CN102652891A - Energy-saving automatic control device of cloth-bag dust removal system and control method for blast furnace dust removal - Google Patents
Energy-saving automatic control device of cloth-bag dust removal system and control method for blast furnace dust removal Download PDFInfo
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Abstract
The invention provides an energy-saving automatic control device of a cloth-bag dust removal system and a control method for blast furnace dust removal. The energy-saving automatic control device comprises an input unit, a variable frequency drive unit, an execution unit and a PLC (programmable logic controller) control unit, wherein the input unit is composed of a fast acting fuse, a contactor and an electric reactor; the variable frequency drive unit consists of a rectification module and a capacitor, together with a braking unit, an inverter, a CPU (central processing unit) with a vector control function and a 220V power supply; the execution unit is composed of an electric reactor, a throttle rotary actuator and a throttle control device; the PLC control unit is composed of a PLC and an auxiliary circuit; the primary side of the rectification module of the variable frequency drive unit is connected with an output end of the electric reactor of the input unit and the secondary side of the rectification module is connected with the electric reactor of the execution unit through the capacitor and the inverter; the rectification module and the inverter are connected with the CPU through a bus, the CPU and the PLC are connected in a communication manner through a switching value and an analog quantity, and a throttle control end of the PLC unit is connected with the execution unit. Meanwhile, the device is used for controlling the blast furnace dust removal. By adopting the energy-saving automatic control device and the control method provided by the invention, the fan utilization can be improved, the accuracy control on the dust removal can be realized, the electric energy can be saved, heat productivity of the device can be reduced, the dust recovery rate can be improved, the cloth-bag damage rate can be reduced, and exhaust gas and dust emissions can be decreased.
Description
Technical field
The present invention relates to a kind of metallurgical industry automated control technology that is applied to the environmental protection field, the control method of particularly a kind of bag-type dust removal system energy-saving automatic control device and blast furnace dedusting.
Background technology
Along with the Chinese society rapid development of economy, environment, energy problem become increasingly conspicuous, the current task of being faced with arduous energy-saving and emission-reduction.
Nowadays; Bag-type dust removal system in many fields such as iron and steel, nonferrous metallurgy, chemical industry, machinery, building materials, electric power, light industry, weaving, grain, communications and transportation all exists a lot of deficiencies; Especially blast furnace dedusting system; Effects of energy conservation and environmental protection is undesirable, can only the bigger particle of filtering particle diameter, still contain a large amount of dust in the air.Like the flue dust of blast furnace iron notch, one ton of molten iron of general every smelting can produce the 2.5kg flue dust, and smoke granularity is little; Account for 61.97% less than 10 μ m, 17.39% flue dust particle diameter is wherein arranged, in air, be in free state less than 3 μ m; Can be for a long time floating; And some metal particle can be dissolved in the respiratory tract juice, and its toxicity can have influence on people's lung, has destroyed the environment of human survival.Dust also has direct influence to equipment, and shortened the service life of equipment such as electrical equipment, machinery; Iron laden dust can not effectively be reclaimed, and energy waste is serious.
In addition, operate in not speed governing state all the year round at the most of dedusting fans of China at present, if motor adopts power frequency operation, regulate air quantity through the outlet damper of damper and satisfy manufacturing technique requirent, a large amount of electric energy waste on valve.
In view of above reason, imperative to the improvement of bag-type dust removal system.At the protection environment for human survival, the today of building a harmonious society is significant; On automaticity, also embodied scientific and technological content, have distinct times flavour.
Summary of the invention
In order to address the above problem, to the invention provides and a kind ofly can effectively reclaim the bag-type dust removal system energy-saving automatic control device of dust and the control method of blast furnace dedusting.
To achieve these goals, technical scheme of the present invention is:
A kind of bag-type dust removal system energy-saving automatic control device; Comprise by fastp-acting fuse FU with short circuit quick fuse function and contactor KM with automatic control cut-out main power source function, and the input block with inlet wire reactor 2L1 formation of filtering and compensate function; Reach the variable frequency drive unit that supporting with it brake unit ZD, the NB of dc inversion communication function, the CPU with vector control function and 220V power supply DY constitutes by ZL with AC-DC function and dc energy storage capacitor C; By the out put reactor 2L2 with filtering defencive function with have the blower fan rotating driver D of electric energy, mechanical energy translation function and a performance element that damper control constitutes; The PLC control module that partly constitutes by PLC unit and auxiliary circuit; Rectification module ZL in the described variable frequency drive unit once is connected with the reactor 2L1 output of input block, and secondary is connected with reactor 2L2 end of incoming cables in the performance element through inverter NB behind energy storage filter capacitor C; Rectification module ZL is connected with CPU through bus with inverter NB; The existing switching value that is connected through the passive normal opened contact of relay between the PLC unit in CPU and the PLC control module; Being connected of analog quantity and communication arranged again, and the air door control end of PLC unit links to each other with the air damper controller of performance element.
A kind of bag-type dust removal system energy-saving automatic control device of using may further comprise the steps the method that the blast furnace dedusting system controls:
1) after the molten soon knife-like switch FU of power supply connects, output 220V power supply DY, the control system of variable frequency drive unit and PLC unit gets into duty;
2) when detecting variable frequency drive unit, CPU controls system just often, the terminal 5 output high level of CPU, and main contactor KM coil is charged; It is closed that input block is often opened main contacts KM, and the variable frequency drive unit major loop powers on, if this moment, variable frequency drive unit was in proper working order; System is ready; Then the terminal 3 of CPU is exported high level, and relay 2K5 coil is charged, and the passive normal opened contact of 2K5 is closed; This moment the PLC unit the COM1 power supply to make 101 terminals through no source contact 2K5 be high level, variable frequency drive unit standby ready signal entering PLC;
3) after the PLC unit received the variable frequency drive unit standby ready signal, if detecting hot-metal ladle and carriage near switch 2K8 has arrived blast furnace iron notch, then the normal opened contact 2K8 near switch was closed; Make lead-out terminal 104 be high level; Relay 2K1 coil is charged, and passive normal opened contact 2K1 is closed, and making No. 7 terminals of CPU is high level; After variable frequency drive unit receives the operation permission instruction from PLC; Be in enabled, this moment, the running status of blower fan was determined by the dust on-line measuring device, and detected concentration is compared with setting concentration; Employing multistage speed controlling when molten iron is toppled over is toppled over the stepless time adjustment control of adopting when the back hot-metal ladle and carriage leaves under the analog quantity control, realizes automatic dust tracking, until blower fan is out of service;
4) in the control procedure of air door, gather the pressure simulation signal that comes from the damper control of installing on the blower fan and carry out the aperture feedback, make PLC constantly carry out throttle opening PID adjustment; In the air door adjustment, PLC control system at first detects the set-point and the actual pressure value of feedback of throttle opening, and calculates their value of delta, and according to the size of value of delta, PLC constantly revises set-point.When the δ value was big, PLC adjusted set-point rapidly, makes air door reach given aperture rapidly; When the δ value hour, when promptly air door is near set-point, the set-point of PLC adjustment also very little, promptly along with the reducing of δ value, the opening value of the given frequency-conversion drive apparatus of control system also reduces in proportion, until being zero.
Beneficial effect of the present invention is:
1, through multiple modes such as PLC software programming and hardware configurations, hardware configuration comprises frequency converter, PLC, host computer, and the address is set respectively, constitutes communication network.On software; The PLC ladder diagram adopts call instruction; When ZK8 is closed, call multistage speed controlling subprogram, adopted comparator instruction, timer instruction, logical AND instruction, logic OR instruction, differential instruction etc. in the subprogram; Compare the basic, normal, high output of control frequency converter according to actual dust concentration and setting speed; When ZK8 opened, PLC carried out main program, the minimum speed corresponding according to the Cmin of setting, and the signal of telecommunication that converts rotary speed instruction to 4 ~ 20mA during analog quantity control is issued the CPU of variable frequency drive unit, is used for controlling the linear rotating speed of blower fan; When ZK5 opens or ZK6 when closed, PLC adopts the logical AND instruction, seals all outputs.In order to make system that bigger torque and rapidity can be arranged, can reach the comparatively ideal degree of accuracy again, on control mode, adopted U1/f1 control.
2, fan operation adopts two kinds of control modes, and a kind of is the multistage speed controlling, and another kind is the stepless time adjustment under the analog quantity control, is automaticallyed switch by ZK8.
3, adopt input, out put reactor, both played the effect of protection and anti-external disturbance and energy storage, also play and eliminate the harmonic wave effect that rectifier cell produces in the variable frequency drives, short-circuit protection is also had certain effect.
4, realize soft start (frequency converter is started to high speed by low speed step by step) with frequency control, reduced mechanical shock, the prolonged mechanical life-span equipment.
5, adopt PLC controller and relay not to have source contact, both played the effect of rotating speed programming, protection, also play the effect of extraneous signal and variable frequency drive unit isolation filter, prevent to damage converter unit.
6, this device has improved the blower fan utilization rate greatly, and the realization dedusting is accurately controlled, and maintenance is few; Save electric energy, reduced the caloric value of equipment, reduced equipment failure rate and noise; The dust rate of recovery improves, and the cloth bag breakage rate reduces, and has reduced waste gas and soot emissions.
7, be convenient to the foundation of a dust, general filtrate mainly relies on the long-pending dust layer that is attached to its surface to play filtration in the sack cleaner, and itself mainly play supporting role filtrate.When new filtrate began dedusting, because the diameter in hole is greater than the diameter of dust, a lot of dust particles can see through filtrate, and therefore, the efficiency of dust collection of new filtrate is not high, and it can only stop particle bigger in the dust.But along with the carrying out of filter process, bigger powder dust particle stops the hole of filtrate, has reduced the area of hole, makes that less powder dust particle can not be through being blocked in filter material surface.One deck dust of slowly having built up at filter material surface is called " dust layer ".This automaton and control method because the size variation of wind speed helps the formation of said process, are set up dust layer one time.Simultaneously, dust layer along with the thickening of dust layer, is taked this device and control method after setting up, and prevents cloth bag because long-term air pressure is too high is prone to aging and bursts, and has prolonged cloth bag service life.
8, the yield of dust increases, and can utilize again again, forms Recycling Economy System.
9, rotation speed of fan is regulated and is regulated more science than flow limit method.The change of rotation speed of fan does not influence pipe system performance curve, but the actual condition point will change, and the characteristic curve under new rotating speed and the intersection point of pipe system performance curve are new operating point.Speed regulation method will increase pipe resistance in the time of can as flow limit method, not regulating when changing main frame output flow or pressure, thus speed regulation method quite flow limit method have the considerable energy saving characteristic.
10, have good human-computer dialogue and communication, be convenient to PC control.Through network settings, the frequency conversion system running status can directly controlled and keep watch on to host computer.Host computer is an industrial control computer, and it is connected to PLC communication port B through netting twine, except that PLC is controlled, controls and keeps watch on also through PLC port A, and then to frequency converter, and blower fan security and reliability are improved.
Description of drawings
Fig. 1 is a structural principle sketch map of the present invention.
The specific embodiment
Be that example combines accompanying drawing that the present invention is done further explain with the blast furnace dedusting system below.
As shown in Figure 1; Fastp-acting fuse FU primary connection end in the input block 1 is connected with inlet wire three phase mains L1, L2, L3 respectively; The secondary connection end is connected with main contactor KM primary connection end U, V, W respectively; The secondary connection end of main contactor KM is connected with primary connection end 2U1,2V1, the 2W1 of reactor 2L1 respectively, and the secondary connection end of reactor 2L1 is connected with major loop end of incoming cables 2U2,2V2, the 2W2 of variable frequency drive unit 2 respectively.
In the variable frequency drive unit 2, inlet wire 2U2,2V2,2W2 are connected with the input of inversion module NB after rectification module ZL rectification and capacitor C energy storage filtering, and the output 2U3 of NB, 2V3,2W3 are connected with the reactor 2L2 input of performance element 3.Wherein the dc output end L+ of ZL, L-are connected with input ZD1, the ZD2 of brake unit ZD respectively; The output R1 of ZD, R2 are connected with braking resistor R, and the failure output terminal GZ1 of ZD, GZ2 are connected with the coil-end of brake unit fault output relay ZK7.Rectification module ZL is connected with microprocessor CPU through bus DA, DB respectively with inversion module NB.The input of 220V control power supply DY links to each other with lower end U, the V of fast molten FU, and the output of DY is connected with control power end M1, the M2 of control power end P1, P2 and the PLC unit of CPU.Among the terminal row X101 of CPU, terminal 1 is an input signal power supply common port, and terminal 2 is output control power supply common port; Terminal 3 is the ready output of converter unit, and terminal 4 is a system failure output, and terminal 5 is main contactor KM combined floodgate control output end; Terminal 6 is a brake unit fault input, and terminal 7 is for allowing the fan operation input, and terminal 8 is blower fan low cruise control input end; Terminal 9 is blower fan middling speed operation control input end, and terminal 10 is blower fan high-speed cruising control input end.Among the terminal row X102, terminal 11,12 is the Communication Control end, is connected with the communication port A of PLC unit, and terminal 13,14 is the input of analog quantity 4～20mA control rotation speed of fan, is connected with A+, the A-end of PLC unit.
Reactor 2L2 output 2U4 in the performance element 3,2V4,2W4 are connected with driver D, and the output mechanical axis of driver D is connected with the blower fan mechanical axis, air door and the damper control used when controlled wind speed and startup are installed on the blower fan.
The terminal COM1 of PLC unit 4 is an input signal power supply common port, and terminal 101 is ready input signal end, and terminal 102 is a system failure input signal end; Terminal 103 is the hot-metal ladle and carriage test side that puts in place, and what use is near switch here, when hot-metal ladle and carriage during near blast furnace iron notch; Dedusting fan moves automatically; Terminal 104 ends are that converter unit allows the operation control output end, and terminal 105 is blower fan low cruise control output end, and terminal 106 is blower fan middling speed operation control output end; Terminal 107 is blower fan high-speed cruising control output end, and terminal COM2 is output control power supply common port.C+, C-port are that air door is controlled the analog quantity output port automatically, can regulate the size of fan delivery at any time, and D+, D-are the throttle opening feedback end, and the A port is PLC and inverter communication port, and the B port is the host computer network port, realize network control.A+, A-port are the port of PLC analog quantity control blower fan wind speed, send the signal of telecommunication of 4 ~ 20mA and give the CPU of variable frequency drive unit, are used for controlling the linear rotating speed of blower fan.Realize the stepless speed regulation of blower fan.B+, B-port are connected with the dust on-line measuring device; Dust investigating converts the dust concentration signal that comes from the A1-A4 probe into the analog signals of 4 ~ 20mA; Send into B+, the B-end of PLC; PLC compares according to the actual detected value and the setting value of dust concentration, as the control of rotation speed of fan, adjusts fan speed when concentration changes automatically.Frequency converter can be operated in stepless time adjustment mode and the multistage speed control method under the analog quantity control; Switch by ZK8; Simulation control can realize the blower fan stepless time adjustment; Be applicable in the slower environment of Dust Capacity variable quantity that the multistage speed controlling can realize multistage fan speed control, be applicable to that Dust Capacity changes faster in the environment or needs rotating speed to force situation.
As shown in Figure 1, after the molten soon knife-like switch FU of power supply connects, DY output 220V power supply, the control system of variable frequency drive unit 2 and PLC unit gets into duty.
When detecting variable frequency drive unit, CPU controls system just often, the terminal 5 output high level of CPU, and main contactor KM coil is charged; It is closed that input block 1 is often opened main contacts KM, and variable frequency drive unit 2 major loops power on, if this moment, variable frequency drive unit 2 was in proper working order; System is ready; Then the terminal 3 of CPU is exported high level, and relay 2K5 coil is charged, and the passive normal opened contact of 2K5 is closed; This moment the PLC unit the COM1 power supply to make 101 terminals through no source contact 2K5 be high level, variable frequency drive unit standby ready signal entering PLC.
After the PLC unit receives the variable frequency drive unit standby ready signal, under the trouble-free prerequisite of system, arrived blast furnace iron notch if detect hot-metal ladle and carriage near switch 2K8; Normal opened contact 2K8 near switch is closed, and the output of PLC shielding analog quantity makes lead-out terminal 104 be high level; Relay 2K1 coil is charged, and passive normal opened contact 2K1 is closed, and making No. 7 terminals of CPU is high level; Variable frequency drive unit is in enabled after receiving the operation permission instruction from PLC, and this moment, the running status of blower fan was determined by the dust on-line measuring device; Detected concentration is compared with setting concentration, the rotating speed size of difference size decision blower fan.General molten iron adopts the multistage speed controlling when toppling over, and promptly in the PLC program, sets three values; Basic, normal, high three points of the corresponding dust concentration of difference; When concentration arrives low spot, after the PLC analyzing and processing, make relay 2K2 coil charged; Passive normal battle, 2K2 was closed, Frequency Converter Control blower fan low cruise; When concentration reaches mid point, make relay 2K2,2K3 coil simultaneously charged, passive normal battle, 2K2,2K3 were closed simultaneously, the operation of Frequency Converter Control blower fan middling speed; When concentration reaches high point, make relay 2K2,2K3,2K4 coil simultaneously charged, passive normal battle, 2K2,2K3,2K4 were closed simultaneously, Frequency Converter Control blower fan high-speed cruising, when concentration from high to low the time, actuating of relay reversed in order.The conversion of three kinds of speed adds suitable time-delay, produces concussion with Fan-free.When dust concentration was lower than minimum setting value, blower fan stopped.Topple over and adopt the stepless time adjustment under the analog quantity control when back hot-metal ladle and carriage leaves; Be hot-metal ladle and carriage when leaving blast furnace iron notch, open the output of PLC shielding 2K1,2K2,2K3,2K4 near the normal opened contact 2K8 of switch; And use analog quantity channel 4～20mA output size to control frequency converter; Thereby the continuous control rotation speed of fan is realized automatic dust tracking automatically, and it is out of service to be lower than the setting value rear fan up to dust.Multistage speed controlling and stepless time adjustment control dual mode are through automaticallying switch near switch ZK8, and ZK8 is the multistage speed controlling when closed, are stepless time adjustment control when ZK8 opens.Blower fan is in rotary course; PLC constantly controls the aperture state of air door; Carry out air quantity and regulate (mainly still rotation speed of fan adjusting; Cooperate rotational speed regulation to use when use or air quantity control accuracy were had relatively high expectations when the adjusting of flow limit method air quantity had only fan starting as auxiliary adjustment), guarantee that fan operation in optimum state, reaches desirable dust removing effects.In the control procedure of air door, gather the pressure simulation signal that comes from the damper control of installing on the blower fan, carry out the aperture feedback, make PLC constantly carry out throttle opening PID adjustment.In the air door adjustment, PLC control system at first detects the set-point and the actual pressure value of feedback of throttle opening, and calculates their value of delta, and according to the size of value of delta, PLC constantly revises set-point.When the δ value was big, PLC adjusted set-point rapidly, makes air door reach given aperture rapidly; When the δ value hour, when promptly air door is near set-point, the set-point of PLC adjustment also very little, promptly along with the reducing of δ value, the opening value of the given frequency-conversion drive apparatus of control system also reduces in proportion, until being zero.
The Communication Control of PLC and converter plant is the another kind of mode of operation of native system, breaks down or host computer when controlling automatically when point-to-point control, and system's automatic entry communication network control state realizes that function is identical with above-mentioned point-to-point control.
Blower fan is in rotary course, and frequent parking has a lot of potential energy and becomes on the dc bus that electric energy feeds back to converter unit through driver D, and DC bus-bar voltage is raise, and this moment, brake unit ZD can discharge unnecessary energy through braking resistor R.When the brake unit fault, relay ZK7 coil is charged, and its passive normal opened contact ZK7 is closed, and No. 6 terminals of CPU become high level, thereby CPU identifies the brake unit fault.CPU can carry out corresponding interrupt routine according to the rank of various faults, if cut off main contactor KM, then CPU No. 5 terminals become low level output by high level, main contactor KM coil losing electricity, and the KM main contact breaks off, the outage of converter unit major loop.When the system failure appears in converter unit, No. 4 terminal output high level of CPU, relay 2K6 coil is charged; Its passive normal opened contact 2K6 is closed, and 102 terminals of PLC become high level, and PLC is identified as the converter unit system failure; Make handled through program; Promptly interrupt the output of multistage speed governing and simulation speed governing, close air door, and alarm is arranged.
Technical characterictic parameter of the present invention is following:
1, speed-regulating range width, high-voltage large-capacity frequency converter timing scope can accomplish 0-100%.
2, degree of regulation is high, and efficient is high, and in normal slewing range, the gross efficiency of converter plant is more than 93%, and power factor surpasses 0.95.
3, be linear relationship between rotating speed and the rotary speed instruction, at the speed adjustable range of motor with interior rotating speed deviation less than 1%, precision is high.
4, the aperture of air door adopts Linear Control, and pressure feedback is regulated according to the different conditions of blower fan voluntarily, and deviation ratio is less than 2%.
5, change fan performance curve with speed regulating method; Relation (Q2=Q1 (n2/n1), P2=p1 (n2/n1) 2, P2=p1 (n2/n1) 3) by air quantity Q, blower fan total head P, power of fan P and rotation speed of fan n three can be known; Regulate rotation speed n and can change fan characteristic curve; The change of rotation speed of fan does not influence pipe system performance curve, but the actual condition point will change, and the characteristic curve under new rotating speed and the intersection point of pipe system performance curve are new operating point.Speed regulation method will not increase pipe resistance in the time of can not resembling the adjusting of flow limit method when changing blower fan output flow or pressure, thus speed regulation method quite flow limit method have the considerable energy saving characteristic.
According to dust concentration adjustment cloth bag wind speed; Thereby change active force and comprehensive effect between cloth bag and dust and the wind speed; Make and filter the grit diameter and be reduced to 0.08 μ m by 0.1 original μ, the particle diameter clearance brings up to 99% by former 90%, and particle diameter reaches 100% by the dust clearance of former 40 μ m and drops to 30 μ m; Improved clean-up effect, air is purified significantly.
Claims (6)
1. bag-type dust removal system energy-saving automatic control device; It is characterized in that: comprise by fastp-acting fuse FU with short circuit quick fuse function and contactor KM with automatic control cut-out main power source function, and the input block (1) with inlet wire reactor 2L1 formation of filtering and compensate function; Reach the variable frequency drive unit (2) that supporting with it brake unit ZD, the NB of dc inversion communication function, the CPU with vector control function and 220V power supply DY constitutes by ZL with AC-DC function and dc energy storage capacitor C; By the out put reactor 2L2 with filtering defencive function with have the blower fan rotating driver D of electric energy, mechanical energy translation function and performance element (3) that damper control constitutes; The PLC control module (4) that partly constitutes by PLC unit and auxiliary circuit; Rectification module ZL in the described variable frequency drive unit (2) once is connected with the reactor 2L1 output of input block (1), and secondary is connected with reactor 2L2 end of incoming cables in the performance element (3) through inverter NB behind energy storage filter capacitor C; Rectification module ZL is connected with CPU through bus with inverter NB; The existing switching value that is connected through the passive normal opened contact of relay between the PLC unit in CPU and the PLC control module (4); Being connected of analog quantity and communication arranged again, and the air door control end of PLC unit links to each other with the air damper controller of performance element (3).
2. bag-type dust removal system energy-saving automatic control device according to claim 1; It is characterized in that: the fastp-acting fuse FU primary connection end in the input block (1) is connected with inlet wire three phase mains L1, L2, L3 respectively; The secondary connection end is connected with main contactor KM primary connection end U, V, W respectively; The secondary connection end of main contactor KM is connected with primary connection end 2U1,2V1, the 2W1 of reactor 2L1 respectively, and the secondary connection end of reactor 2L1 is connected with major loop end of incoming cables 2U2,2V2, the 2W2 of variable frequency drive unit 2 respectively.
3. bag-type dust removal system energy-saving automatic control device according to claim 1; It is characterized in that: rectification module ZL dc output end L+, L-in the variable frequency drive unit (2) are connected with input ZD1, the ZD2 of brake unit ZD respectively; The output R1 of ZD, R2 are connected with braking resistor R, and the failure output terminal GZ1 of ZD, GZ2 are connected with the coil-end of brake unit fault output relay ZK7; Rectification module ZL is connected with microprocessor CPU through bus DA, DB respectively with inversion module NB; The input of 220V control power supply DY links to each other with lower end U, the V of fast molten FU, and the output of DY is connected with control power end M1, the M2 of control power end P1, P2 and the PLC unit of CPU; Among the terminal row X101 of CPU, terminal 1 is an input signal power supply common port, and terminal 2 is output control power supply common port; Terminal 3 is the ready output of converter unit, and terminal 4 is a system failure output, and terminal 5 is main contactor KM combined floodgate control output end; Terminal 6 is a brake unit fault input, and terminal 7 is for allowing the fan operation input, and terminal 8 is blower fan low cruise control input end; Terminal 9 is blower fan middling speed operation control input end, and terminal 10 is blower fan high-speed cruising control input end; Among the terminal row X102, terminal 11,12 is the Communication Control end, is connected with the communication port A of PLC unit, and terminal 13,14 is the input of analog quantity 4～20mA control rotation speed of fan, is connected with A+, the A-end of PLC unit.
4. bag-type dust removal system energy-saving automatic control device according to claim 1; It is characterized in that: the reactor 2L2 output 2U4 in the performance element (3), 2V4,2W4 are connected with driver D; The output mechanical axis of driver D is connected with the blower fan mechanical axis, air door and the damper control used when controlled wind speed and startup are installed on the blower fan.
5. bag-type dust removal system energy-saving automatic control device according to claim 1 is characterized in that: the terminal COM1 of PLC unit (4) is an input signal power supply common port, and terminal 101 is ready input signal end; Terminal 102 is a system failure input signal end, and terminal 103 is the test side, and terminal 104 ends are that converter unit allows the operation control output end; Terminal 105 is blower fan low cruise control output end, and terminal 106 is blower fan middling speed operation control output end, and terminal 107 is blower fan high-speed cruising control output end; Terminal COM2 is output control power supply common port, and C+, C-port are that air door is controlled the analog quantity output port automatically, and D+, D-are the throttle opening feedback end; The A port is PLC and inverter communication port; The B port is the host computer network port, and A+, A-port are the port of PLC analog quantity control blower fan wind speed, send the signal of telecommunication of 4 ~ 20mA and give the CPU of variable frequency drive unit; B+, B-port are connected with the dust on-line measuring device; Dust investigating converts the dust concentration signal that comes from A1-A4 probe the analog signals of 4 ~ 20mA into, sends into B+, the B-end of PLC, and PLC is according to the size of dust concentration adjustment fan speed automatically.
6. an application rights requires 1～5 each described bag-type dust removal system energy-saving automatic control device to the method that the blast furnace dedusting system controls, and it is characterized in that: may further comprise the steps:
1) after the molten soon knife-like switch FU of power supply connects, output 220V power supply DY, the control system of variable frequency drive unit and PLC unit gets into duty;
2) when detecting variable frequency drive unit, CPU controls system just often, the terminal 5 output high level of CPU, and main contactor KM coil is charged; It is closed that input block is often opened main contacts KM, and the variable frequency drive unit major loop powers on, if this moment, variable frequency drive unit was in proper working order; System is ready; Then the terminal 3 of CPU is exported high level, and relay 2K5 coil is charged, and the passive normal opened contact of 2K5 is closed; This moment the PLC unit the COM1 power supply to make 101 terminals through no source contact 2K5 be high level, variable frequency drive unit standby ready signal entering PLC;
3) after the PLC unit received the variable frequency drive unit standby ready signal, if detecting hot-metal ladle and carriage near switch 2K8 has arrived blast furnace iron notch, then the normal opened contact 2K8 near switch was closed; Make lead-out terminal 104 be high level; Relay 2K1 coil is charged, and passive normal opened contact 2K1 is closed, and making No. 7 terminals of CPU is high level; After variable frequency drive unit receives the operation permission instruction from PLC; Be in enabled, this moment, the running status of blower fan was determined by the dust on-line measuring device, and detected concentration is compared with setting concentration; Employing multistage speed controlling when molten iron is toppled over is toppled over the stepless time adjustment control of adopting when the back hot-metal ladle and carriage leaves under the analog quantity control, realizes automatic dust tracking, until blower fan is out of service;
4) in the control procedure of air door, gather the pressure simulation signal that comes from the damper control of installing on the blower fan and carry out the aperture feedback, make PLC constantly carry out throttle opening PID adjustment; In the air door adjustment, PLC control system at first detects the set-point and the actual pressure value of feedback of throttle opening, and calculates their value of delta, and according to the size of value of delta, PLC constantly revises set-point; When the δ value was big, PLC adjusted set-point rapidly, makes air door reach given aperture rapidly; When the δ value hour, when promptly air door is near set-point, the set-point of PLC adjustment also very little, promptly along with the reducing of δ value, the opening value of the given frequency-conversion drive apparatus of control system also reduces in proportion, until being zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101444320A CN102652891A (en) | 2012-05-09 | 2012-05-09 | Energy-saving automatic control device of cloth-bag dust removal system and control method for blast furnace dust removal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012101444320A CN102652891A (en) | 2012-05-09 | 2012-05-09 | Energy-saving automatic control device of cloth-bag dust removal system and control method for blast furnace dust removal |
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| CN103345277A (en) * | 2013-06-21 | 2013-10-09 | 青岛理工大学 | Automatic speed regulating device of dust removal fan |
| CN104906882A (en) * | 2015-05-14 | 2015-09-16 | 周海兵 | Power plant dust removal device |
| CN106020099A (en) * | 2016-07-11 | 2016-10-12 | 广东德龙能效技术有限公司 | Printing machine position selective dust automatic negative pressure discharge system in printing workshop |
| CN106194808A (en) * | 2016-07-13 | 2016-12-07 | 唐山国丰钢铁有限公司 | A kind of method of accurate adjustment secondary BOF dedusting system rotation speed of fan |
| CN107099634A (en) * | 2017-06-15 | 2017-08-29 | 上海宝钢节能环保技术有限公司 | The energy-saving control method of blast furnace cast house dedusting system |
| CN109603340A (en) * | 2018-12-11 | 2019-04-12 | 杨彦青 | A kind of intelligent electric automation dedusting control system and method |
| CN109663447A (en) * | 2019-02-21 | 2019-04-23 | 唐山市神州机械有限公司 | A kind of dry separation system and dry dressing method of the underground based on circulating current |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103345277A (en) * | 2013-06-21 | 2013-10-09 | 青岛理工大学 | Automatic speed regulating device of dust removal fan |
| CN104906882A (en) * | 2015-05-14 | 2015-09-16 | 周海兵 | Power plant dust removal device |
| CN104906882B (en) * | 2015-05-14 | 2017-01-18 | 周海兵 | Power plant dust removal device |
| CN106020099A (en) * | 2016-07-11 | 2016-10-12 | 广东德龙能效技术有限公司 | Printing machine position selective dust automatic negative pressure discharge system in printing workshop |
| CN106194808A (en) * | 2016-07-13 | 2016-12-07 | 唐山国丰钢铁有限公司 | A kind of method of accurate adjustment secondary BOF dedusting system rotation speed of fan |
| CN106194808B (en) * | 2016-07-13 | 2017-10-20 | 唐山国丰钢铁有限公司 | A kind of method of accurate adjustment secondary BOF dedusting system rotation speed of fan |
| CN107099634A (en) * | 2017-06-15 | 2017-08-29 | 上海宝钢节能环保技术有限公司 | The energy-saving control method of blast furnace cast house dedusting system |
| CN109603340A (en) * | 2018-12-11 | 2019-04-12 | 杨彦青 | A kind of intelligent electric automation dedusting control system and method |
| CN109663447A (en) * | 2019-02-21 | 2019-04-23 | 唐山市神州机械有限公司 | A kind of dry separation system and dry dressing method of the underground based on circulating current |
| CN109663447B (en) * | 2019-02-21 | 2024-03-08 | 唐山神州机械集团有限公司 | Underground dry separation system and method based on circulating air flow |
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