CN2668631Y - Furnace pressure control system of glass melting furnace - Google Patents
Furnace pressure control system of glass melting furnace Download PDFInfo
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- CN2668631Y CN2668631Y CNU2003201297351U CN200320129735U CN2668631Y CN 2668631 Y CN2668631 Y CN 2668631Y CN U2003201297351 U CNU2003201297351 U CN U2003201297351U CN 200320129735 U CN200320129735 U CN 200320129735U CN 2668631 Y CN2668631 Y CN 2668631Y
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Abstract
The utility model discloses a furnace pressure control system of glass melting furnace whose purpose is to provide a furnace pressure control system which has favorable regulating performance and solves fluctuation of furnace pressure of melting furnace in the process of reversal. The technical projects of the utility model are that the furnace pressure control system of glass melting furnace comprises a closed-loop regulation device which is arranged between the delivery end and a draught stack which connects with the delivery end; the closed-loop regulation device comprises a differential pressure transmitter, an intelligent modulator, an actuator and a rotating shut-off device which are connected in proper order. The utility model is characterized in that the closed-loop regulation device forms an inner ring regulatory site; the place between the draught stack and the utility model is provided with an outer ring regulatory site which is connected with an industrial control computer; the input terminal of the industrial control computer is connected with the differential pressure transmitter, the actuator and the intelligent modulator through a circuitry; the output terminal of the industrial control computer is connected with the data interface of the outer ring regulatory site; the input terminal of the outer ring regulatory site is connected with power supply; the output terminal of the outer ring regulatory site is connected with the draught stack. The utility model has favorable control precision and control effect, and is easy to popularize.
Description
Technical field
The utility model relates to a kind of klin pressure control system, specifically relates to a kind of klin pressure control system of glass melter.
Background technology
In flat glass industry was produced, keeping the pressure-stabilisation in the glass melter was the precondition of production high-quality sheet glass.
Several the Fuel lances that respectively be equipped with existing glass melter both sides, the Fuel lance of both sides is atomizing of liquids or geseous fuel in melting furnaces alternately, the injecting time of each side spray gun is tens to 20 minutes, is changed to opposite side then, and this switching process is called " changing fire " of glass melter.
Liquid or geseous fuel be in the glass melter internal combustion, and the flue gas that the kiln internal combustion produces enters chimney by flue and the rotary shutter that is installed in the flue, through chimney to airborne release.The draft of chimney and be installed in furnace pressure in " aperture " decision melting furnaces of rotary shutter in the flue.Under the constant prerequisite of the draft of chimney, " aperture " of rotary shutter increases, and the resistance of flue is reduced, and furnace pressure reduces.Otherwise furnace pressure then raises.Glass melter requires furnace pressure when ordinary production be stable " pressure-fired ", about 5Pa ± 0.1Pa.
The furnace pressure control mode that adopts is generally at present:
Between the exit of glass melter and smoke evacuation chimney, a closed loop adjustment device is set, the closed loop adjustment device is connected with rotary shutter successively by differential pressure transmitter, intelligent regulator, topworks, measure furnace pressure by differential pressure transmitter, pressure signal is converted to the electrical signal or the gas signal of standard, send into intelligent regulator as observed value, compare with observed value of establishing in the intelligent regulator and the artificial set-point of setting, obtain a deviate; This deviate becomes the output valve of intelligent regulator after computing, amplification, be the electrical signal or the gas signal of standard, control topworks with it, the mechanical output shaft of topworks is adjusted " aperture " of rotary shutter to reach the purpose of control furnace pressure, as shown in Figure 4 by the rotating shaft of connecting rod promotion rotary shutter.This is a kind of single closed loop adjustment mode of routine, under normal circumstances can satisfy the requirement of sheet glass melting furnaces to furnace pressure control.The klin pressure control system of present most glass melters all is to adopt this single closed loop adjustment mode.But this mode exists following problem:
1) because the pass between the variation of the furnace pressure of " aperture " of rotary shutter and glass melter is a nonlinear relationship, when " aperture " of rotary shutter is in 15%～40% scope, approximate a kind of linear relationship is better in the adjusting function of this scope inner control system between the furnace pressure of " aperture " and glass melter; When if the aperture of rotary shutter is above above 50%, " aperture " of rotary shutter changes the furnace pressure influence of glass melter very little, the obvious variation of the adjusting function of Controlling System.Therefore under the prerequisite that satisfies the furnace pressure stability requirement, " aperture " of rotary shutter changed within its linearity range, guarantee that Controlling System possesses good adjusting function, key depends on the draft of chimney.And in original regulation system, the draft of chimney can't be controlled, and therefore in the draft of chimney inadequately or the next adjusting function that can't guarantee Controlling System of too big situation, thereby also will influence stablizing of furnace pressure.
2) in " changing fire " process of glass melter, the stopping of Fuel lance sprayed, the factors such as increase of combustion air volume can cause the sudden change of melting furnaces internal pressure.For " step " signal that prevents this furnace pressure sudden change formation makes regulation system produce " concussion ", and then destroy the normal working order of whole regulation system, be provided with lock/unlock device in the intelligent regulator.The several seconds intelligent regulator is " locked " before " changing fire " process begins, and in the process of whole " changing fire ", " aperture " of rotary shutter remains unchanged.Behind " changing fire " end of processing, intelligent regulator is " release " again, and whole regulation system is recovered works better up to next " changing fire " cycle.Though this practice has been avoided regulation system " concussion ", in fact the furnace pressure of glass melter is unsettled in the process of whole " changing fire ".
3), will make the resistance of flue increase considerably if on the flue of glass melter, install desulfurating dust removing device for flue gas additional.In this case, only rely on the draft of chimney can't satisfy production to the stable requirement of furnace pressure.Therefore, after installing desulfurating dust removing device for flue gas additional on the flue of glass melter, existing klin pressure control system can't use without transformation.
The utility model content
The purpose of this utility model provides and a kind ofly can make rotary shutter " aperture " change not exceed its linearity range all the time, to guarantee that Controlling System possesses good adjusting function; Can make glass melter in " changing fire " process, still can keep furnace pressure stable; And can be applicable to that glass melter has installed the klin pressure control system behind the desulfurating dust removing device for flue gas additional.
To achieve these goals, the utility model is by the following technical solutions: a kind of glass melter klin pressure control system, comprise the closed loop adjustment device that is arranged between glass melter exit end and the connected smoke evacuation chimney, the closed loop adjustment device comprises successively differential pressure transmitter, intelligent regulator, topworks and the rotary shutter that connects, and described rotary shutter is arranged in described glass melter and the flue that described smoke evacuation chimney communicates; It is characterized in that: by comprise that the closed loop adjustment device forms one in ring regulate part, its with described smoke evacuation chimney between also be provided with an external loop regulation part that is connected with industrial control computer; Described industrial control computer input terminus is connected with the valve position output terminal of the signal output part of described differential pressure transmitter, described topworks and the lock/unlock signal end of described intelligent regulator, and the data-interface of described industrial control computer output terminal and described external loop regulation part joins; The output terminal of described external loop regulation part and described smoke evacuation chimney join.
Described external loop regulation part is made up of frequency transformer and induced draft fan, and described data-interface is arranged on the described frequency transformer; The input terminus and the power supply of described frequency transformer join, and its output terminal is the power interface of described induced draft fan; The blast inlet of described induced draft fan joins through described rotary shutter and described glass melter by flue, and its air outlet communicates with described smoke evacuation chimney by flue.
Described industrial control computer is provided with conventional soft, the hardware except that interior, also be provided with A/D analog to digital converter, D/A digital to analog converter, switching value I/O hardware module, and ring is regulated co-ordinate motion, the signal processing of part and external loop regulation part, the application software of signal handoff functionality in the control; The furnace pressure signal of described differential pressure transmitter output; The furnace pressure set(ting)value of described intelligent regulator output; The rotary shutter aperture signal that described topworks sends is imported the analog quantity input terminus of described industrial control computer respectively; The lock/unlock signal of described intelligent regulator enters the switching value input terminus of described industrial control computer; The analog quantity output terminal of described industrial control computer is connected with corresponding described data of frequency converter interface respectively with described switching value output terminal, furnace pressure signal, furnace pressure set(ting)value and the rotary shutter aperture signal of described analog quantity output terminal output after calculation process; Described switching value output terminal is exported described rotary shutter aperture setting regions.
The higher limit of described rotary shutter aperture setting regions is 30% of standard-sized sheet zone, and lower value is 20% of standard-sized sheet zone.
Principle of work of the present utility model is: ring is regulated part and functions such as external loop regulation part co-ordinate motion, signal processing and signal switching in being finished by industrial control computer, forms a double closed-loop control system.
When interior ring is regulated the part works better, realize controlling the purpose of furnace pressure by adjusting rotary shutter " aperture ".At this moment,, rotary shutter " aperture " is changed all the time within its " aperture given area ", regulate part with ring in guaranteeing and possess good adjusting function all the time by the draft of external loop regulation part control induced draft fan.
Change in the fiery process at melting furnaces, interior ring is regulated part and is " locked ", and at this moment, external loop regulation part is according to the trend adjustment induced draft fan draft that furnace pressure changes, and remains on melting furnaces and changes the stable of furnace pressure in the fiery process.
According to above-mentioned principle of work, course of action of the present utility model is as follows:
When interior ring is regulated the part works better, measure furnace pressure by differential pressure transmitter, be converted to the standard electric signal and deliver to industrial control computer, simultaneously also deliver in the intelligent regulator, a comparison unit and a people by intelligent regulator compare for set-point, the deviate that obtains is delivered to the input terminus of topworks as the output signal of intelligent regulator after computing, multiplying arrangement computing, amplification, the output shaft of topworks promotes rotary shutter by a connecting rod and adjusts its " aperture "." aperture " signal of rotary shutter is a standard signal, is sent by the position transducer of topworks inside, delivers to the valve position output terminal of topworks or manual operator, delivers to industrial control computer by lead.
Deviate is being for just when furnace pressure is higher than set-point, the output shaft forward rotation of the output signal of intelligent regulator control topworks, and " aperture " of rotary shutter increases, and furnace pressure is descended.When furnace pressure drops to when equaling set-point, deviate is zero, and the output shaft of the output signal control topworks of intelligent regulator stops, and rotary shutter keeps current " aperture ".In like manner, deviate is for negative when furnace pressure is lower than set-point, and " aperture " of rotary shutter reduces, and furnace pressure is risen.Therefore, when interior ring regulation system works better, the stable of furnace pressure is to rely on " aperture " of regulating rotary shutter to realize.When interior ring was regulated the part works better, industrial control computer was delivered to frequency transformer with " aperture " signal of rotary shutter as observed value." the aperture given area " of rotary shutter be set in 20%～30% scope deliver to frequency transformer as the optimum working zone set-point.
When " aperture " of rotary shutter was in the scope of given area, frequency transformer made id-motor keep current speed, and the induced draft fan draft is constant.
When " aperture " of rotary shutter during greater than the higher limit of aperture given area, as: flashboard " aperture " was greater than 30% o'clock, and frequency transformer will improve the rotating speed of id-motor automatically, strengthened the draft of induced draft fan.At this moment, because the effect that interior ring is regulated, " aperture " of rotary shutter reduces, and gets back in the given area, and frequency transformer stops to improve the id-motor rotating speed and keeps current speed.
As a same reason, when " aperture " of rotary shutter during less than the lower value of given area, as: flashboard " aperture " was less than 20% o'clock, and frequency transformer will reduce the rotating speed of id-motor automatically, reduce the draft of induced draft fan.Because the effect that interior ring is regulated, " aperture " of rotary shutter increases, and gets back in the given area, and frequency transformer makes id-motor stop to slow down and keeping current speed.
Above-mentioned way makes rotary shutter " aperture " change and remains in the optimum working zone that ring is regulated and had best adjusting function in making.
Intelligent regulator several seconds before " changing fire " process begins is " locked ", and in the process of whole " changing fire ", " aperture " of rotary shutter remains unchanged.Behind " changing fire " end of processing, intelligent regulator " release ", whole interior ring is regulated and is recovered works better, up to next " changing fire " cycle." locking " of intelligent regulator and " release " signal are a switch signal, also deliver to industrial control computer when sending into intelligent regulator.The furnace pressure signal that industrial control computer begins differential pressure transmitter is sent here when receiving " locking " signal carries out calculation process, and the trend that furnace pressure changes when obtaining " changing fire " is delivered to frequency transformer as observed value.The set-point of furnace pressure is also delivered to frequency transformer by industrial control computer as set-point.Simultaneously, cut off the observed value that frequency transformer was accepted before intelligent regulator is " locked ", i.e. the set-point of " aperture " of rotary shutter and rotary shutter " aperture given area ".
In frequency transformer, observed value and set-point compare, and the deviate that draws is through amplifying the rotating speed of the output frequency control id-motor that changes frequency transformer.The explanation furnace pressure is higher when observed value is higher than set-point, and this moment, the rotating speed of id-motor improved, and the draft that strengthens induced draft fan reduces furnace pressure.Otherwise the explanation furnace pressure is on the low side when observed value is lower than set-point, and this moment, the rotating speed of id-motor reduced, and the draft that reduces induced draft fan improves furnace pressure.
When observed value equaled set-point, id-motor then kept current rotating speed.Like this, in " changing fire " process, play the effect of stablizing furnace pressure in the mode of regulating the induced draft fan draft.
When " changing fire " end of processing, interior ring is regulated the intelligent regulator " release " of part, " release " signal is sent into industrial control computer, industrial control computer is breaking at observed value and the set-point of sending into frequency transformer in " changing fire " process when receiving " release " signal, recover both both rotary shutters " aperture given area " of rotary shutter " aperture " and set-point of " changing fire " observed value before.Frequency transformer recovers the control to rotary shutter " aperture " scope.
The utility model adopts technique scheme, and its beneficial effect is as follows:
1. compare with traditional single closed loop klin pressure control system, adopt two closed loop klin pressure control systems that " aperture " of rotary shutter changed and remain within its " linearity range " scope, make Controlling System possess best adjusting function.
2. owing to added the external loop regulation part that industrial control computer connects, give an order, the rotating speed of induced draft fan is adjusted automatically, overcome at the klin pressure fluctuation of glass melter in " changing fire " process by frequency transformer by industrial control computer.
3. if glass melter has installed desulfurating dust removing device for flue gas additional, adopt the two closed loop klin pressure control systems that are connected with industrial control computer, offset desulfation dust-extraction device to the resistance that smoke evacuation is caused with the draft that adds induced draft fan, efficiently solve the control problem that installs furnace pressure behind the desulfurating dust removing device for flue gas additional.
4. adopt the control mode of " two closed loop ", no matter ring regulate part or external loop regulation part break down or safeguard, when overhauling, another part can become interim " a single closed loop control system " furnace pressure is controlled, keep the stable of its furnace pressure, can not make a big impact production.
Description of drawings
Fig. 1 is a system architecture connection diagram of the present utility model
Fig. 2 moves towards schematic block diagram for the utility model industrial control computer signal
Fig. 3 is the system architecture connection diagram of the utility model embodiment two
Fig. 4 is existing klin pressure control system structure connection diagram
Embodiment
Embodiment one
With existing glass melter klin pressure control system texture improvement is example.
As shown in Figure 1, the utility model is made up of glass melter 1, interior ring adjusting part 2, external loop regulation part 3, industrial control computer 4, chimney 5; Ring adjusting part 2 is made up of with rotary shutter 24 differential pressure transmitter 21, intelligent regulator 22, topworks 23 wherein, and external loop regulation part 3 is made up of frequency transformer 31 and induced draft fan 32.
Differential pressure transmitter 21 is arranged at glass melter breastwork place, it is 1151DR that differential pressure transmitter 21 is selected model for use, its input terminus is provided with a pressure pipe, the pressure pipe is probeed in the glass melter 1, measure the furnace pressure signal and become to send and be DC4～20mA normalized current signal, by lead its normalized current signal is delivered to the input end of analog signal and intelligent regulator 22 input terminuss of industrial control computer 4 more respectively by differential pressure transmitter 21; The implication of the useful range according to differential pressure transmitter 21: DC4～20mA normalized current signal is: 4mA represents the lower value that differential pressure transmitter 21 is measured; 20mA represents the higher limit of its measurement.Selecting model for use is that the intelligent regulator 22 of GXGS-812 is delivered to topworks 23 with the output of the normalized current signal that receives, and the implication of the normalized current signal of topworks's 23 outputs is: 4mA represents that the regulated quantity of intelligent regulator 22 outputs is 0%; 20mA represents that the regulated quantity of intelligent regulator 22 outputs is 100%.Topworks 23 selects " electronic angle stroke actuators " for use, its model is SCHIEBEL-AB, be provided with mechanical parts such as servo multiplying arrangement, motor, step-down gear in the stroke actuators of electronic angle, can change the corner of its output shaft according to the standard electric signal of input, output shaft is controlled " aperture " of rotary shutter 24 by the rotating shaft of connecting rod promotion rotary shutter 24; The signal of exporting when intelligent regulator 22 is changed to 20mA by 4mA; The output shaft corner of topworks 23 is changed to 90 ° by 0 °; " aperture " of rotary shutter 24 is changed to 100% (standard-sized sheet) by 0% (complete shut-down); The aperture signal is delivered to the input end of analog signal of industrial control computer 4 by the valve position output terminal of topworks 23 by lead.
Frequency transformer 31, selecting model for use is DANFOSS-VLT5000, which is provided with one group of data-interface is connected with the output terminal of industrial control computer 4, the input terminus of frequency transformer 31 connects power supply, its output terminal is as the power interface of induced draft fan 32 motors, and the variation of frequency transformer 31 output frequencies causes the variation of induced draft fan 32 motor speeds to change the draft of induced draft fan 32; The blast inlet of induced draft fan 32 joins through rotary shutter 24 and glass melter 1 by flue; The air outlet of induced draft fan 32 joins by flue and chimney 5.Above-mentioned differential pressure transmitter 21, intelligent regulator 22, topworks 23, rotary shutter 24 and frequency transformer 31, induced draft fan 32 are the market sale product.
As shown in Figure 1 and Figure 2, except that soft, the hardware setting of indispensability, also be furnished with A/D analog to digital converter, D/A digital to analog converter, switching value I/O hardware module and carry out the application software that inner and outer rings is regulated the functions such as co-ordinate motion, signal processing and signal switching of part in the industrial control computer 4.The input terminus of described industrial control computer is provided with analog quantity input interface and switch value input interface, and its output terminal is provided with analog output interface circuit and switching value output interface; Described analog quantity input interface is by an A/D analog to digital converter module and CPU intercommunication; Described switch value input interface is by a switching input module and CPU intercommunication; Described analog output interface circuit is by a D/A digital to analog converter module and CPU intercommunication, described switching value output interface is by switching value output hardware module and CPU intercommunication, and the output terminal of described industrial control computer is connected with the corresponding data-interface of described frequency transformer respectively through lead with described switching value output interface by described analog output interface circuit.
The input signal of industrial control computer 4 comprises: the furnace pressure signal of being sent by differential pressure transmitter 21; " locking/unlocking " signal of intelligent regulator 22; " aperture " signal of rotary shutter 24; Output signal comprises: the furnace pressure signal after calculation process; " aperture " signal of rotary shutter 24; The furnace pressure set-point; On the rotary shutter 24 " aperture given area "/lower value.
Glass melter needs when " changing fire " intelligent regulator 22 " locking ", end of processing needs intelligent regulator 22 " release " " to change fire ", lock/unlock signal is a switch signal, also sends into the switching value input terminus of industrial control computer 4 when sending into intelligent regulator 22.
Employed induced draft fan 32 specifications of external loop regulation part can be determined according to the exhaust gas volumn of melting furnaces.Induced draft fan power is 150KW in the present embodiment, selects the motor speed of the Frequency Converter Control induced draft fan of equal-wattage for use.Frequency transformer 31 possesses analog quantity standard signal input function; The switching value input function; With the joining data-interface of industrial control computer and have continuously " PID " regulatory function, the PID implication is " ratio, integration, a differential ".
When interior ring is regulated the part works better, industrial control computer 4 is delivered to frequency transformer 31 with " aperture " signal of rotary shutter as observed value, " the aperture given area " of rotary shutter 24 is set in 20%～30% scope delivers to frequency transformer 31 as optimum linear work area set-point in advance; Regulate the draft of the motor speed control induced draft fan 32 of induced draft fans 32 by frequency transformer 31, make " aperture " of rotary shutter 24 change not exceed all the time " 20%～30% " this optimum linear zone in and work.
When glass melter 1 " changed fire ", the intelligent regulator 22 that interior ring is regulated part 2 was " locked ", and " locking " signal is delivered to industrial control computer 4; The furnace pressure signal that industrial control computer 4 begins differential pressure transmitter 21 is sent here when receiving " locking " signal carries out calculation process, and the trend that furnace pressure changes when obtaining " changing fire " is delivered to frequency transformer 31 as observed value.The given of furnace pressure also delivered to frequency transformer 31 by industrial control computer 4 as set-point.Simultaneously, cut off the observed value that frequency transformer 31 was accepted before intelligent regulator 22 is " locked ", i.e. the set-point of " aperture " of rotary shutter 24 and rotary shutter 24 " aperture given area ".At this moment, the trend that furnace pressure changes during frequency transformer 31 bases " changing fire " is regulated 32 drafts of induced draft fan 32 rotating speed of motor control induced draft fan, to reach the purpose of stablizing furnace pressure in " changing fire " process.
When " changing fire " end of processing, interior ring is regulated the intelligent regulator 22 " release " of part 2, " release " signal is sent into industrial control computer 4, industrial control computer 4 is breaking at when receiving " release " signal and sends into 31 observed value (furnace pressure variation tendency) and set-point (furnace pressure set-point) in " changing fire " process, recovers " changing fire " observed value and set-point before.The control that frequency transformer 31 recovers rotary shutter 24 " aperture " scope.
Embodiment two
With the glass melter klin pressure control system that improves the back and add desulfurating dust removing device for flue gas is example.
As shown in Figure 3, present embodiment is made up of glass melter 1, interior ring adjusting part 2, external loop regulation part 3, industrial control computer 4, chimney 5 and melting furnaces desulfurating dust removing device for flue gas 6.Ring is regulated part 2 and is made up of differential pressure transmitter 21, intelligent regulator 22, topworks 23, rotary shutter 24, manual operator 25, current to pneumatic converter 26 wherein, and wherein to select model for use be 1151DR to differential pressure transmitter 21; Intelligent regulator 22 is selected model TM22 for use; Topworks 23 selects Xian Instrument Factory three disconnected protection angle stroke actuators for use; It is GXGS-5500 that manual operator 25 is selected model for use; Current to pneumatic converter 26 is supporting by the producer of topworks.External loop regulation part 3 is made up of frequency transformer 31 and induced draft fan 32, and wherein to select model for use be DANFOSS-VLT5000 to frequency transformer 31, and its power is identical with the power of induced draft fan 32.
And embodiment one difference is: installed one additional between the rotary shutter 24 of regulating part 2 at interior ring and the chimney 5 and overlapped desulfurating dust removing device for flue gas 6, the melting furnaces flue gas carries out desulfurization and dedusting by flue through the import that rotary shutter 24 enters desulfurating dust removing device for flue gas 6, flue gas after the processing enters the inlet of induced draft fan 32 through the outlet of desulfation dust-extraction device 6, discharges through chimney 5 by induced draft fan 32.The input terminus and the power supply of frequency transformer 31 join, and its output terminal provides power supply for the motor of induced draft fan 32; Frequency transformer 31 is provided with data-interface and industrial control computer 4 joins, and desulfurating dust removing device for flue gas 6 is connected for loop with industrial control computer 4.
Owing to installed the melting furnaces desulfurating dust removing device for flue gas additional in the system, can also utilize this desulfurating dust removing device for flue gas self with main control computer install corresponding software and hardware additional and also can realize the furnace pressure signal in " changing fire " process is handled; According to " locking " and " release " signal the observed value of frequency transformer and set-point such as are switched at function.Do not need to add separately again an industrial control computer.
Owing to installed the glass melter desulfurating dust removing device for flue gas additional, increased considerably the resistance of flue.So selected in the present embodiment induced draft fan power is 220KW, selected transducer power also is 220KW.
For breaking down, the intelligent regulator 22 of ring adjusting part 2 in preventing influences production, install a manual operator 25 additional at the intelligent regulator output terminal, when in a single day intelligent regulator 22 breaks down, can use manual operator 25 to send signal, manual operation is implemented in 23 actions of control topworks.Manual operator 25 is digital manual operator, and digital manual operator is provided with a valve position output terminal, and the aperture signal of rotary shutter 24 inputs in the industrial control computer by the valve position output terminal.Because what the topworks 23 in the present embodiment adopted is pneumatic angle stroke actuators, in be provided with devices such as pneumatic servo enlarger, cylinder, piston.Therefore the current signal of being sent here through manual operator 25 by intelligent regulator 22 output terminals must be converted to standard gas signal by current to pneumatic converter 26 and could be received by pneumatic angle stroke actuators.The output signal of intelligent regulator 22 enters current to pneumatic converter 26 through manual operator 25 and is converted to the gas signal; Control pneumatic angle stroke actuators 23, the output shaft of topworks 23 is by the rotating shaft of connecting rod promotion rotary shutter 24, and " aperture " of regulating rotary shutter 24 is to reach the purpose of control furnace pressure.
Differential pressure transmitter 21, intelligent regulator 22, topworks 23, rotary shutter 24, manual operator 25, current to pneumatic converter 26 and frequency transformer 31, induced draft fan 32 selected in the present embodiment are the market sale product
Characteristics of the present utility model are: the klin pressure control system before adopting two closed loop klin pressure control systems and transforming Compare, because " aperture " of rotary shutter changes all the time in its best " linearity range " zone its control accuracy Be enhanced, the degree of stability of furnace pressure is satisfactory. In the process of " changing fire ": interior ring is regulated part Be " locked ", but because this moment, external loop regulation part is regulated the draft of air-introduced machine according to the furnace pressure variation tendency, so that The variation of furnace pressure is very mild in " changing fire " process. The sort of in the process of " changing fire " of furnace pressure before transforming " step " property is beated and has also no longer been occurred.
Claims (4)
1. the klin pressure control system of a glass melter, comprise the closed loop adjustment device that is arranged between glass melter exit end and the connected smoke evacuation chimney, the closed loop adjustment device comprises successively differential pressure transmitter, intelligent regulator, topworks and the rotary shutter that connects, and described rotary shutter is arranged in described glass melter and the flue that described smoke evacuation chimney communicates; It is characterized in that: by comprise that the closed loop adjustment device forms one in ring regulate part, its with described smoke evacuation chimney between also be provided with an external loop regulation part that is connected with industrial control computer; Described industrial control computer input terminus is connected with the valve position output terminal of the signal output part of described differential pressure transmitter, described topworks and the lock/unlock signal end of described intelligent regulator, and the data-interface of described industrial control computer output terminal and described external loop regulation part joins; The output terminal of described external loop regulation part and described smoke evacuation chimney join.
2. according to the klin pressure control system of the described glass melter of claim 1, it is characterized in that: described external loop regulation part is made up of frequency transformer and induced draft fan, and described data-interface is arranged on the described frequency transformer; The input terminus and the power supply of described frequency transformer join, and its output terminal is the power interface of described induced draft fan; The blast inlet of described induced draft fan joins through described rotary shutter and described glass melter by flue, and its air outlet communicates with described smoke evacuation chimney by flue.
3. according to the klin pressure control system of claim 1 or 2 described glass melters, it is characterized in that: in the described industrial control computer except that being provided with conventional soft, hardware, also be provided with A/D analog to digital converter, D/A digital to analog converter, switching value I/O hardware module, and ring is regulated co-ordinate motion, the signal processing of part and external loop regulation part, the application software of signal handoff functionality in the control; The furnace pressure signal of described differential pressure transmitter output; The furnace pressure set(ting)value of described intelligent regulator output; The rotary shutter aperture signal that described topworks sends is imported the analog quantity input terminus of described industrial control computer respectively; The lock/unlock signal of described intelligent regulator enters the switching value input terminus of described industrial control computer; The analog quantity output terminal of described industrial control computer is connected with corresponding described data of frequency converter interface respectively with described switching value output terminal, furnace pressure signal, furnace pressure set(ting)value and the rotary shutter aperture signal of described analog quantity output terminal output after calculation process; Described switching value output terminal is exported described rotary shutter aperture setting district thresholding.
4. according to the klin pressure control system of the described glass melter of claim 3, it is characterized in that: be limited to 30% of standard-sized sheet zone on the thresholding of described rotary shutter aperture setting district, be limited to 20% of standard-sized sheet zone down.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2003201297351U CN2668631Y (en) | 2003-12-22 | 2003-12-22 | Furnace pressure control system of glass melting furnace |
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| CNU2003201297351U CN2668631Y (en) | 2003-12-22 | 2003-12-22 | Furnace pressure control system of glass melting furnace |
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| CN102174939A (en) * | 2011-01-28 | 2011-09-07 | 柳丹 | Control circuit for controlling fan by using frequency converter and control method thereof |
| CN104654741A (en) * | 2013-11-18 | 2015-05-27 | 北京天达京丰技术开发有限公司 | Material drying device |
| CN104817254A (en) * | 2015-04-15 | 2015-08-05 | 蚌埠凯盛工程技术有限公司 | Intelligent regulating method for furnace pressure of glass melting furnace |
| CN105276928A (en) * | 2015-03-10 | 2016-01-27 | 洛阳辰祥机械科技有限公司 | Material drying device and heat energy recycling method thereof |
| CN115215532A (en) * | 2022-07-27 | 2022-10-21 | 成都南玻玻璃有限公司 | Glass melting furnace pressure control method and control system thereof |
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2003
- 2003-12-22 CN CNU2003201297351U patent/CN2668631Y/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100378016C (en) * | 2005-05-23 | 2008-04-02 | 彩虹集团电子股份有限公司 | Small perturbation reversal control method for kiln furnace |
| CN102174939A (en) * | 2011-01-28 | 2011-09-07 | 柳丹 | Control circuit for controlling fan by using frequency converter and control method thereof |
| CN104654741A (en) * | 2013-11-18 | 2015-05-27 | 北京天达京丰技术开发有限公司 | Material drying device |
| CN105276928A (en) * | 2015-03-10 | 2016-01-27 | 洛阳辰祥机械科技有限公司 | Material drying device and heat energy recycling method thereof |
| CN104817254A (en) * | 2015-04-15 | 2015-08-05 | 蚌埠凯盛工程技术有限公司 | Intelligent regulating method for furnace pressure of glass melting furnace |
| CN115215532A (en) * | 2022-07-27 | 2022-10-21 | 成都南玻玻璃有限公司 | Glass melting furnace pressure control method and control system thereof |
| CN115215532B (en) * | 2022-07-27 | 2023-06-02 | 成都南玻玻璃有限公司 | Glass melting furnace pressure control method and control system thereof |
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