CN106316165A - Furnace kiln finished product lime temperature control method - Google Patents
Furnace kiln finished product lime temperature control method Download PDFInfo
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- CN106316165A CN106316165A CN201510383427.9A CN201510383427A CN106316165A CN 106316165 A CN106316165 A CN 106316165A CN 201510383427 A CN201510383427 A CN 201510383427A CN 106316165 A CN106316165 A CN 106316165A
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- temperature
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- calx
- stove
- control
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Abstract
The invention discloses a furnace kiln finished product lime temperature control method, and belongs to the control field; the method includes the steps: an adjustable damper and a frequency conversion fan are adopted for adjusting natural air entering a lime cooling zone, to adjust the value of the cold wind inlet flow quantity, so as to achieve the purpose of controlling the lime cooling temperature; based on a conventional frequency conversion fan temperature adjusting system, a temperature signal acquisition unit and a temperature control unit are additionally arranged for achieving automatic/manual control of the furnace kiln finished product lime temperature; a temperature set value is preset; when the temperature of lime located in the furnace kiln cooling zone deviates from the set value, the current given value of a frequency converter is automatically adjusted for adjusting the speed of the frequency conversion fan, and then the value of the cold wind flow quantity is adjusted, so that the constant temperature of the lime is ensured and equipment damage is avoided. The method can be widely used in the field of temperature control of furnace kiln finished product lime.
Description
Technical field
The invention belongs to control field, particularly relate to a kind of temperature-controlled process for stove finished product Calx.
Background technology
Stove is the equipment for production metallurgy Calx, mainly can be used to produce high-quality active lime, meets refining
Steel needs.
Limestone is transported to kiln crown by single bucket elevator, in hopper, sealed gate and revolving top enter kiln.Kiln
Inside having upper and lower two-layer burner and be uniformly staggeredly arranged, kiln is divided into two burning zones, upper burning zone is adverse current, under
Burning zone is and flows.And to flow band bottom be cooling zone, Calx passes through after fresh air cools down in the bottom of cooling zone
Drawing mechanism is discharged, and is pooled to cool down in air endless tube, delivers to as combustion air after the air of cooling zone is preheated
Each burner.In whole stove production procedure, finished product Calx controls most important in the temperature cooling of cooling zone.If
The chilling temperature of Calx controls too low, can affect the quality of Calx, wastes the energy；Further, the chilling temperature of Calx
Control too high, can directly damage upstream device.
General Calx enters cooling zone need to be cooled to less than 200 degree, enters back into Finished Product Transport System.
Existing traditional control method is in Non-follow control (as shown in fig. 1), specifically regulation cold wind inlet air flow
Amount size, if Calx temperature too high (temperature range is more than 200 degree), then needs constantly to adjust frequency converter frequency,
Change motor speed, namely change for wind flow.
Owing to existing traditional control method is manual working, empirical too strong, the different people adjustment width to parameter
Degree and the anticipation value difference to parameter, cause Calx temperature stability poor, and regulation is excessively frequent, is unfavorable for that Calx is just
Often produce.
Summary of the invention
The technical problem to be solved is to provide a kind of stove finished product Calx temperature-controlled process, this technical side
Case is worth on the basis of desired temperature SP, as Calx temperature departure desired temperature SP, by being automatically adjusted change
Frequently device given value of current value size, namely regulation cold flow size, so that it is guaranteed that Calx temperature constant, it is to avoid set
Enjoy damage.
The technical scheme is that a kind of stove finished product Calx temperature-controlled process of offer, including using wind adjustable
The natural air entering Calx cooling zone is adjusted by door and frequency conversion fan, to regulate cold wind charge flow rate size,
And then reach to control the purpose of cool lime temperature；It is characterized in that:
Preset a desired temperature SP, when Calx temperature departure setting value SP being positioned at stove cooling zone
Time, by being automatically adjusted inverter current set-point size, regulate the speed of frequency conversion fan, and then regulation cold wind
Uninterrupted, so that it is guaranteed that Calx temperature constant, it is to avoid equipment is impaired；
Described temperature-controlled process, by the basis of existing frequency conversion fan thermoregulating system, sets up a temperature
Signal gathering unit and a temperature control unit, realize the automatic/hand control of described stove finished product Calx temperature
System；
Wherein, the temperature signal probe tube parts in described temperature signal collection unit, it is positioned at described stove cold
But in band, the signal that temperature signal collection unit detects, change into 4-20MA current signal through transmitter defeated
Deliver in described temperature controller, to PLC analog input channel, turn after central controller CPU processes
Change actual value into, using this actual value as cool lime temperature detection process value PV；
Described control unit combines cool lime detection process values PV value and setting value SP, utilizes PID to regulate,
Exported by control signal output valve OP of controller PIC111, control described inverter current set-point, logical
Cross the given value of current controlling converter, be finally reached the speed controlling frequency conversion fan；
When the rapid change of frequency conversion fan, in stove Calx band, temperature changes simultaneously；
When stove cooling zone internal temperature detection process values PV is higher than desired temperature SP, described control unit
Increasing inverter current set-point, converter output frequency rises, and frequency conversion motor speed increases, rotation speed of fan simultaneously
Also accelerating, cold wind charge flow rate increases, and now in stove cooling zone, temperature reduces, until from temperature signal collection
Temperature detection process value PV of unit reaches SP value；
When stove cooling zone internal temperature detection process values PV is less than desired temperature SP, described control unit
Reducing inverter current set-point, converter output frequency declines, and frequency conversion motor speed reduces, rotation speed of fan simultaneously
Also reducing, cold wind charge flow rate weakens, and now in stove cooling zone, temperature rises, until from temperature signal collection
Temperature detection process value PV of unit reaches SP value.
Wherein, described PID regulates to be divided into and automatically controls and two kinds of control modes of Non-follow control.
Concrete, automatically control in control mode described, PLC carries out Automatic Control, at desired temperature
After SP sets, output valve OP of controller PIC111 can adjust output valve automatically, it is not necessary to manually does
In advance, finally, the Calx detection process values PV value of point for measuring temperature reaches with setting value SP or keeps consistent.
Concrete, in described Non-follow control control mode, a given output on host computer or control unit
Value, by the OP value of controller PIC111, is directly output to described converter and is controlled, described cooling
Calx temperature detection process value PV does not compares with desired temperature SP.
Concrete, it is little that described temperature signal collection unit opens one with wind pipe junction in stove cooling zone
Hole, insert thermal resistance, by thermal resistance detect described in cool lime temperature detection process value PV.
Further, at described automatic control mode, in the process of implementation, by temperature controller PID regulator
Parameter tuning value as follows:
Proportionality coefficient P is 0.001；
Integration time constant I is 600S；
Derivative time constant D is 5S；
Described stove finished product Calx temperature-controlled process, adjusts the above-mentioned parameter of temperature controller PID regulator
Value value is sent in the data register of PLC, and desired temperature SP is set to 200 degree, and temperature controller locks
This value, now control signal output valve OP of controller PIC111 can adjust automatically, by controlling and regulation frequency conversion
The size of device given value of current value so that cool lime temperature detection process value PV follows desired temperature SP automatically
Moving up and down, final process values PV is close to desired temperature SP, and namely process values PV carries out determining at 200 degree
Amount controls, controlled with temperature stabilization in guaranteeing Calx entrance stove cooling zone.
Stove finished product Calx temperature-controlled process described in technical solution of the present invention, on the basis of desired temperature SP
Value, as Calx temperature departure desired temperature SP, by being automatically adjusted inverter current set-point size, also
It is exactly to regulate cold flow size, so that it is guaranteed that Calx temperature constant, it is to avoid equipment is impaired.
Compared with the prior art, the invention have the advantage that
1., by introducing automatic temperature-adjusting control system, it is automatically adjusted inverter current set-point size, and then automatically adjusts
Joint cold flow size, so that it is guaranteed that Calx temperature constant；
2. using computer control system, automatically adjust control to temperature in stove cooling zone, and Calx is in cooling
In band, temperature stabilization is controlled, and quality index meets steel-making needs, it can be ensured that Calx temperature constant, it is to avoid equipment is impaired.
Accompanying drawing explanation
Fig. 1 is original production process figure；
Fig. 2 is the production technology figure of technical solution of the present invention；
Fig. 3 is automatic control flow chart block diagram of the present invention；
Fig. 4 is temperature PID control block diagram of the present invention；
Fig. 5 is Frequency Converter Control schematic diagram of the present invention.
In figure, QL is air switch, and LI1 is forward start end, and K1 is normally opened contact, and LI2 is reverse starting end,
K2 is normally opened contact, and AI1A is analog input end, and AI2 is analog input end, and COM is common port.
Detailed description of the invention
The present invention will be further described with embodiment below in conjunction with the accompanying drawings.
Present invention aim at providing a kind of cool lime temperature-controlled process, it is with desired temperature SP (200 degree)
On the basis of be worth, as Calx temperature departure desired temperature SP, big by being automatically adjusted inverter current set-point
Little, namely regulation cold flow size, so that it is guaranteed that Calx temperature constant, it is to avoid equipment is impaired.
In Fig. 2, technical scheme, it is provided that a kind of stove finished product Calx temperature-controlled process, including adopting
With adjustable ventilation door and frequency conversion fan, the natural air entering Calx cooling zone is adjusted, to regulate cold wind inlet air flow
Amount size, and then reach to control the purpose of cool lime temperature；Its inventive point is:
Described temperature-controlled process, by the basis of existing frequency conversion fan thermoregulating system, sets up a temperature
Signal gathering unit and a temperature control unit, realize the automatic/hand control to described stove finished product Calx temperature
System.
Described temperature-controlled process, presets a desired temperature SP, when the stone being positioned at stove cooling zone
During ash temperature departure setting value SP, by being automatically adjusted inverter current set-point size, regulate frequency conversion fan
Speed, and then regulation cold flow size, so that it is guaranteed that Calx temperature constant, it is to avoid equipment is impaired.
Device involved in the technical program mainly has two unit (see Fig. 2), and one is temperature signal collection unit,
Two is temperature control unit.
In temperature signal collection unit, temperature signal probe tube parts are positioned at stove cooling zone, detect signal warp
Transmitter changes in 4-20MA current signal input temp controller, to PLC analog input channel, in warp
Centre controller CPU is converted into actual value after processing, using this actual value as cool lime temperature detection process value,
(see Fig. 4) is represented with PV.Cool lime temperature PV value is 200 degree under normal circumstances.
Control unit, mainly in conjunction with cool lime detection process values PV value and setting value SP, utilizes PID to regulate,
Controlling inverter current by controller PIC111OP value output to give, existing PIC111OP value is 0%-100% pair
Answering converter given value of current scope is 4-20MA, and now corresponding converter output frequency is 0-50HZ, corresponding frequency conversion
Motor speed is 0-1500 rev/min, because frequency conversion motor is joined directly together with blower fan, gives by controlling the electric current of converter
Surely being finally reached control fan speed, namely when fan speed changes, in stove Calx band, temperature changes simultaneously,
When stove cooling zone internal temperature detection process values PV (Fig. 4) is higher than set temperature value 200 degree (setting value SP),
Control unit then can increase inverter current and give, and converter output frequency rises, and frequency conversion motor speed increases, with
Time rotation speed of fan also accelerate, air quantity increases, and now in stove cooling zone, temperature reduces, until PV value reaches SP value.
In like manner, when in cooling zone temperature detection process value PV (Fig. 4) less than design temperature 200 degree (setting value SP)
Time, control unit then can reduce inverter current and give, and converter output frequency declines, and frequency conversion motor speed reduces,
Rotation speed of fan also reduces simultaneously, and air quantity weakens, and now in cooling zone, temperature slowly rises, until PV value reaches SP
Value.
PID temperature in the technical program controls to be divided into automatically control and Non-follow control two ways (see Fig. 3).
Automatically controlling and i.e. carried out Automatic Control by PLC, after setting value (SP) sets, output valve (OP) can be certainly
Dynamic adjustment output valve, it is not necessary to carrying out manual intervention, final point for measuring temperature process values (PV) is consistent with setting value (SP) value.
It is obvious that under automatic control mode, whole temperature control system constitutes a closed loop thermal and is automatically adjusted/controls
System.
A Non-follow control i.e. given output valve on host computer, directly exports control, PV by output valve (OP)
Value does not compares with SP value.It it is the most all operation (see Fig. 3 and 4) under automated manner.
It is obvious that under MANUAL CONTROL mode, whole temperature control system constitutes an Open loop temperature and is automatically adjusted/controls
System.
In normal productive process, mainly use automatic control mode, and MANUAL CONTROL mode is as automatically controlling
Emergency processing means when mode fault or automatic control system maintenance.
Described temperature signal collection unit is implemented mainly by monitoring temperature spot, specifically in stove cooling zone with
Wind pipe junction is opened an aperture and is inserted thermal resistance, and thermal resistance selects PT100 type scope at 0-300 degree (see Fig. 2
Shown in), thermal resistance signal line shielded cable first delivers to isolator input, and PLC delivered to again by isolator outfan
On Analog input mModule 140ACI04000 terminal, temperature range corresponding relation is 0-300 degree correspondence 4-20MA, also
It is exactly on-the-spot displays temperature 300 degree, PLC Analog input mModule 140ACI04000 terminal is 20MA, on-the-spot
Displays temperature 200 degree, PLC Analog input mModule 140ACI04000 terminal should be 14.7MA, thus will be existing
Field temperature signal is converted to 4-20ma current signal and delivers to PLC control.
Temperature control unit is embodied as seeing shown in Fig. 3 Fig. 5, controls to be divided into automatically control and Non-follow control two kinds
Mode.Non-follow control gives output valve OP (see Fig. 4) the most on computers, as picture display OP value 50% (is said
It is 12MA that bright frequency converter A I2 receives given electric current, now motor speed 750 revs/min, checks temperature in stove cooling zone
Degree controller show, as PV value be more than SP value (see Fig. 4), OP value aperture to be increased, it is assumed that open to 60%, this
Time outside air enter flow in cooling zone and increase accordingly, temperature can decline, and final PV process values is close to SP setting value
200 degree.
In Figure 5, QL is air switch, and LI1 is forward start end, and K1 is normally opened contact, if K1 Guan Bi,
LI1 receives 24V power supply, and mair motor forward starts, and LI2 is reverse starting end, and K2 is normally opened contact, if K2
Guan Bi, LI3 receives 24V power supply, mair motor reverse starting, and AI1A is analog input end, voltage range 0-10V,
Different voltages give scalable converter speed, and AI2 is analog input end, current range 4-20ma, different electricity
The given scalable converter speed of stream, COM is common port.
It is the most all to run under automated manner, automatically controls and i.e. carried out Automatic Control by computer, no
Need to carry out manual intervention；Program is in commission by the parameter tuning value ratio system of temperature controller PID regulator
The value that number P is 0.001, integration time constant I is 600S, derivative time constant D is 5S sends into the number of PLC
According in depositor, now input SP setting value is 200 degree (according to technique adjustable), this value of system lock, this
Time temperature controller FIC111OP output valve can automatically adjust, corresponding process value PV (Fig. 4) follows SP automatically
Setting value moves up and down, and final PV value carries out fixing quantity close to SP value i.e. PV process values at 200 degree,
In guaranteeing Calx entrance stove cooling zone, temperature stabilization is controlled, and quality index meets steel-making needs, remarkable in economical benefits.
Owing to the technical program is for existing manual temperature control system, it is the improvement on existing manual temperature control system,
It, based on existing manual temperature control system, only increases temperature signal collection unit and temperature control unit, even if
Original manual temperature control system is provided with the function that automatic temperature-adjusting controls, and its improvement cost is cheap, controls reliability high,
It is easily achieved, contributes to transformation and the upgrading of on-site producing devices, make existing equipment give play to bigger function, fall
Low production cost, improves the economic benefit of enterprise.
Owing to the present invention is by introducing automatic temperature-adjusting control system, it is automatically adjusted inverter current set-point size, enters
And it is automatically adjusted cold flow size, ensure that the temperature constant of finished product Calx；It adopts to computerized control
System, automatically adjust control to temperature in stove cooling zone, and Calx temperature stabilization in cooling zone is controlled, quality
Index meets steel-making needs, it can be ensured that Calx temperature constant, it is to avoid equipment is impaired.
The method can be widely used in the domain of control temperature of stove finished product Calx.
Claims (7)
1. a stove finished product Calx temperature-controlled process, including using adjustable ventilation door and frequency conversion fan to entering Calx
The natural air of cooling zone is adjusted, and to regulate cold wind charge flow rate size, and then reaches to control cool lime temperature
The purpose of degree；It is characterized in that:
Preset a desired temperature SP, when Calx temperature departure setting value SP being positioned at stove cooling zone
Time, by being automatically adjusted inverter current set-point size, regulate the speed of frequency conversion fan, and then regulation cold wind
Uninterrupted, so that it is guaranteed that Calx temperature constant, it is to avoid equipment is impaired；
Described temperature-controlled process, by the basis of existing frequency conversion fan thermoregulating system, sets up a temperature
Signal gathering unit and a temperature control unit, realize the automatic/hand control to described stove finished product Calx temperature
System；
Wherein, the temperature signal probe tube parts in described temperature signal collection unit, it is positioned at described stove cold
But in band, the signal that temperature signal collection unit detects, change into 4-20MA current signal through transmitter defeated
Deliver in described temperature controller, to PLC analog input channel, turn after central controller CPU processes
Change actual value into, using this actual value as cool lime temperature detection process value PV；
Described control unit combines cool lime detection process values PV value and setting value SP, utilizes PID to regulate, logical
Cross the control signal output valve OP output of controller PIC111, control described inverter current set-point, pass through
Control the given value of current of converter, be finally reached the speed controlling frequency conversion fan；
When the rapid change of frequency conversion fan, in stove Calx band, temperature changes simultaneously；
When stove cooling zone internal temperature detection process values PV is higher than desired temperature SP, described control unit
Increasing inverter current set-point, converter output frequency rises, and frequency conversion motor speed increases, rotation speed of fan simultaneously
Also accelerating, cold wind charge flow rate increases, and now in stove cooling zone, temperature reduces, until from temperature signal collection
Temperature detection process value PV of unit reaches SP value；
When stove cooling zone internal temperature detection process values PV is less than desired temperature SP, described control unit
Reducing inverter current set-point, converter output frequency declines, and frequency conversion motor speed reduces, rotation speed of fan simultaneously
Also reducing, cold wind charge flow rate weakens, and now in stove cooling zone, temperature rises, until from temperature signal collection
Temperature detection process value PV of unit reaches SP value.
2., according to the stove finished product Calx temperature-controlled process described in claim 1, it is characterized in that described PID adjusts
Save to be divided into and automatically control and two kinds of control modes of Non-follow control.
3., according to the stove finished product Calx temperature-controlled process described in claim 2, it is characterized in that described automatic
Controlling in control mode, PLC carries out Automatic Control, after desired temperature SP sets, and controller PIC111
Output valve OP can automatically adjust output valve, it is not necessary to carry out manual intervention, finally, the Calx detection of point for measuring temperature
Process values PV value reaches with setting value SP or keeps consistent.
4., according to the stove finished product Calx temperature-controlled process described in claim 2, it is characterized in that described manual
Controlling in control mode, a given output valve on host computer or control unit, by controller PIC111's
OP value, is directly output to described converter and is controlled, described cool lime temperature detection process value PV with
Desired temperature SP does not compares.
5., according to the stove finished product Calx temperature-controlled process described in claim 1, it is characterized in that described temperature letter
Number collecting unit opens an aperture in stove cooling zone with wind pipe junction, inserts thermal resistance, passes through thermal resistance
Cool lime temperature detection process value PV described in detection.
6., according to the stove finished product Calx temperature-controlled process described in claim 2, it is characterized in that described automatic
Control mode, in the process of implementation, by as follows for the parameter tuning value of temperature controller PID regulator:
Proportionality coefficient P is 0.001；
Integration time constant I is 600S；
Derivative time constant D is 5S；
Described stove finished product Calx temperature-controlled process, adjusts the above-mentioned parameter of temperature controller PID regulator
Value value is sent in the data register of PLC, and desired temperature SP is set to 200 degree, and temperature controller locks
This value, now control signal output valve OP of controller PIC111 can adjust automatically, by controlling and regulation frequency conversion
The size of device given value of current value so that cool lime temperature detection process value PV follows desired temperature SP automatically
Moving up and down, final process values PV is close to desired temperature SP, and namely process values PV carries out determining at 200 degree
Amount controls, controlled with temperature stabilization in guaranteeing Calx entrance stove cooling zone.
7., according to the stove finished product Calx temperature-controlled process described in claim 1, it is characterized in that described stove becomes
Product Calx temperature-controlled process, is worth, as Calx temperature departure desired temperature SP on the basis of desired temperature SP
Time, by being automatically adjusted inverter current set-point size, namely regulation cold flow size, so that it is guaranteed that stone
Ash temperature constant, it is to avoid equipment is impaired.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510383427.9A CN106316165A (en) | 2015-06-30 | 2015-06-30 | Furnace kiln finished product lime temperature control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510383427.9A CN106316165A (en) | 2015-06-30 | 2015-06-30 | Furnace kiln finished product lime temperature control method |
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| Publication Number | Publication Date |
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| CN106316165A true CN106316165A (en) | 2017-01-11 |
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ID=57727170
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510383427.9A Pending CN106316165A (en) | 2015-06-30 | 2015-06-30 | Furnace kiln finished product lime temperature control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109539766A (en) * | 2018-11-14 | 2019-03-29 | 楚天科技股份有限公司 | A kind of accurate temperature control method of tunnel oven bringing-up section disturbance rejection |
| CN111003951A (en) * | 2019-12-23 | 2020-04-14 | 浙江中控技术股份有限公司 | Top temperature control method for vertical type mixed-combustion lime kiln |
-
2015
- 2015-06-30 CN CN201510383427.9A patent/CN106316165A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109539766A (en) * | 2018-11-14 | 2019-03-29 | 楚天科技股份有限公司 | A kind of accurate temperature control method of tunnel oven bringing-up section disturbance rejection |
| CN111003951A (en) * | 2019-12-23 | 2020-04-14 | 浙江中控技术股份有限公司 | Top temperature control method for vertical type mixed-combustion lime kiln |
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Application publication date: 20170111 |