CN110442175A - Vacuum pressure and temperature reducing station automatic control system - Google Patents
Vacuum pressure and temperature reducing station automatic control system Download PDFInfo
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- CN110442175A CN110442175A CN201910838536.3A CN201910838536A CN110442175A CN 110442175 A CN110442175 A CN 110442175A CN 201910838536 A CN201910838536 A CN 201910838536A CN 110442175 A CN110442175 A CN 110442175A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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Abstract
The invention belongs to Ferrous Metallurgy control technology fields, it discloses a kind of vacuum pressure and temperature reducing station automatic control systems, it solves low to vapor (steam) temperature, pressure degree of regulation in traditional technology, fluctuation is big, the problem of be easy to causeing the vacuum degree of RH application of vacuum device to rebound, influence molten steel vacuum processing time and treatment effect.The system includes: PLC controller, temperature reducing regulation valve, decompression valve, repid cut-off valve, diffusion valve, temperature transmitter, pressure transmitter and flow transmitter；The temperature transmitter, pressure transmitter and flow transmitter are electrically connected with the input terminal of PLC controller；The temperature reducing regulation valve, decompression valve, repid cut-off valve and diffusion valve are electrically connected with the output end of PLC controller；The temperature reducing regulation valve, decompression valve, temperature transmitter, pressure transmitter and flow transmitter are all made of intelligence instrument.
Description
Technical field
The invention belongs to Ferrous Metallurgy control technology fields, and in particular to a kind of vacuum pressure and temperature reducing station automatically controls system
System.
Background technique
RH application of vacuum device is a kind of molten steel furnace external refining device, is needed left using 200 DEG C of temperature, pressure 1.35MPa
Right unsaturation steam is as working media.The saturation that 370 DEG C of temperature, pressure 3.4MPa or so are generated after steam power plant's power generation is steamed
Vapour, need to be arranged thus pressure and temperature reducing station by the saturated vapor of 370 DEG C of temperature, pressure 3.4MPa or so be processed into 200 DEG C of temperature,
The unsaturation steam of pressure 1.35MPa or so is used for RH application of vacuum device.
It goes into operation initial stage at pressure and temperature reducing station, temperature, pressure, flow of steam etc. detect instrument using III moving-coil of DDZ-
Formula instrument, III adjuster of DDZ- that adjuster also uses, therefore the temperature of steam, pressure degree of regulation are low, fluctuation is big, easily makes
It rebounds at the vacuum degree of RH application of vacuum device, to influence molten steel vacuum processing time and treatment effect.
Summary of the invention
The technical problems to be solved by the present invention are: proposing a kind of vacuum pressure and temperature reducing station automatic control system, solve to pass
Low to vapor (steam) temperature, pressure degree of regulation in system technology, fluctuation is big, and the vacuum degree of RH application of vacuum device is be easy to cause to rebound,
The problem of influencing molten steel vacuum processing time and treatment effect.
The present invention solve above-mentioned technical problem the technical solution adopted is that:
Vacuum pressure and temperature reducing station automatic control system, comprising: PLC controller, temperature reducing regulation valve, decompression valve, quickly
Stop valve, diffusion valve, temperature transmitter, pressure transmitter and flow transmitter；The temperature transmitter, pressure transmitter with
And flow transmitter is electrically connected with the input terminal of PLC controller；The temperature reducing regulation valve, decompression valve, repid cut-off valve
It is electrically connected with the output end of PLC controller with diffusion valve；The temperature reducing regulation valve, decompression valve, temperature transmitter, pressure
Transmitter and flow transmitter are all made of intelligence instrument.
As advanced optimizing, the PLC controller realizes that vapor (steam) temperature, pressure are adjusted using PID double-closed-loop control；Its
In, the inner ring that PID is adjusted is desuperheat, the control of decompression valve aperture, and the outer ring that PID is adjusted is by set temperature or pressure value and reality
The temperature of border measurement or ratio, the control mode of integral and differential linearity combination of pressure value deviation.
Realize that the adjusting of vapor (steam) temperature, pressure more accurately can be adjusted deviation by PID double-closed-loop control,
So that the vapor (steam) temperature and the pressure that control the output of output pressure and temperature reducing station are more stable.
As advanced optimizing, the PLC controller uses Siemens S7-1500PLC.
Siemens S7-1500PLC has the advantages such as response is fast, control ability is strong, human-computer interaction is good, cost performance is high, therefore
It can be used for the PLC control at pressure and temperature reducing station.
As advanced optimizing, the control program in the PLC controller is programmed using structurized module, by control task
It is decomposed into the module of each standalone feature, in normal program operation, tissue block calls standalone feature mould by using CALL instruction
Block.
Control task is completed by the control program of structurized module programming, structure is simply easy to maintain.
As advanced optimizing, the PLC controller includes the rack using the mode that is horizontally mounted and is mounted on rack
On CPU module, power module, 4 digital quantity input modules, 1 digital quantity output module, 2 Analog input mModules and 1
A analog output module；
4 digital quantity input modules, 1 digital quantity output module, 2 Analog input mModules and 1 analog quantity
Output module is connect with the CPU module by core bus；The power module provides power supply for PLC controller and supports；
The configuration mode of the PLC controller are as follows: operation button, selection switch, that valve limit signal enters digital quantity is defeated
Enter module acquisition；Stop valve ON/OFF signal, valve reach a limit/pass, and the limit and sound and light alarm signal are defeated from digital quantity in place
Module exports out；Temperature, pressure, flow, liquid level signal enter Analog input mModule acquisition；Temperature reducing regulation valve control signal,
Decompression valve controls the output of signal from analog amount output module.
The automatic collection of the signals such as temperature, pressure, flow is realized by PLC controller, and in the work of PID double-closed-loop control
Valve is carried out automatically controlling with lower, thus realize to the automation of vapor (steam) temperature, pressure, efficiently, be precisely controlled, be RH vacuum
Processing unit provides temperature, pressure stable unsaturation steam, and then ensures molten steel vacuum processing time and treatment effect.
The beneficial effects of the present invention are:
By temperature reducing regulation valve, decompression valve, temperature transmitter, pressure transmitter and flow transmitter by original
III type instrumentation of DDZ- transform intelligence instrument as, and is always counted according to the I/O of digital quantity, analog quantity, selects Siemens S7-
1500PLC is realized as master controller, the signals such as automatic collection vapor (steam) temperature, pressure, flow using PID double-closed-loop control
Vapor (steam) temperature, pressure are adjusted；To realize to the automation of vapor (steam) temperature, pressure, efficiently, be precisely controlled, be RH application of vacuum
Device provides temperature, pressure stable unsaturation steam, and then ensures molten steel vacuum processing time and treatment effect.
Detailed description of the invention
Fig. 1 is the vacuum pressure and temperature reducing station automatic control system structural block diagram in the present invention；
Fig. 2 is the PLC controller configuration diagram in embodiment；
Fig. 3 is PID double-closed-loop control flow chart；
Fig. 4 is the controlling curve of desuperheat (decompression) regulating valve；
Fig. 5 is PLC control program modular construction figure.
Specific embodiment
The present invention is directed to propose a kind of vacuum pressure and temperature reducing station automatic control system, solves in traditional technology to steam temperature
Degree, pressure degree of regulation are low, and fluctuation is big, and the vacuum degree of RH application of vacuum device is be easy to cause to rebound, and influence molten steel vacuum processing
The problem of time and treatment effect.
As shown in Figure 1, the vacuum pressure and temperature reducing station automatic control system in the present invention, comprising: PLC controller, desuperheat tune
Save valve, decompression valve, repid cut-off valve, diffusion valve, temperature transmitter, pressure transmitter and flow transmitter；The temperature
Degree transmitter, pressure transmitter and flow transmitter are electrically connected with the input terminal of PLC controller；The temperature reducing regulation valve,
Decompression valve, repid cut-off valve and diffusion valve are electrically connected with the output end of PLC controller；The temperature reducing regulation valve, decompression
Regulating valve, temperature transmitter, pressure transmitter and flow transmitter are all made of intelligence instrument.
Embodiment:
The present embodiment is in specific implementation, firstly, by detectors such as the regulating valve at pressure and temperature reducing station, temperature, pressure, flows
Table all uses intelligence instrument, and see Table 1 for details:
Table 1: instrument arrangement table
It is always counted according to the I/O of digital quantity, analog quantity, selects Siemens S7-1500PLC as master controller, adopt automatically
Collect the signals such as vapor (steam) temperature, pressure, flow, PLC configuration is as shown in Figure 2.S7-1500PLC rack uses horizontal installation form, institute
There is module to be mounted on the rack, it is desirable that control in-cabinet temperature≤60 DEG C want high to temperature requirement than right angle setting mode in this way
20℃；CPU module is connect with other SM modules by core bus.The model of S7-1500PLC module is shown in Table 2:
Table 2:S7-1500 PLC module model table
| Serial number | Code name | Title | Specifications and models | Quantity |
| 1 | RACK | Rack | 6ES7590-1AE80-0AA0 | 1 |
| 2 | PS | Power module | 6EP1336-2BA10 | 1 |
| 3 | CPU | CPU module | 6ES7511-1AK01-0AB0 | 1 |
| 4 | SM1-SM4 | Digital quantity input module | 6ES7521-1FH00-0AA0 | 4 |
| 5 | SM5 | Digital output module | 6ES7522-1BL00-0AB0 | 1 |
| 6 | SM6-SM7 | Analog input mModule | 6ES7531-7KF00-0AB0 | 2 |
| 7 | SM8 | Analog output module | 6ES7532-5HF00-0AB0 | 1 |
In control mode, vapor (steam) temperature, pressure tune are realized using PID double-closed-loop control in Siemens S7-1500PLC
Section, as shown in Figure 3；
The advantages of PID is adjusted can make adjusting reaction to the error generated in time, make controlled variable towards reduction error side
To variation.
In formula: u (t) --- temperature or pressure set points
E (t) --- temperature or pressure divergence value
KP、Ti、Td--- pid control parameter
The effect of three control parameters in PID controller is as follows:
1) scaling up COEFFICIENT KpIt will accelerate the response of system, be conducive to reduce static difference in the case where there is static difference.But it crosses
Big proportionality coefficient can make system have biggish overshoot, and generate oscillation, and the stability of system is made to degenerate；
2) increase time of integration TiBe conducive to reduce overshoot, reduce oscillation, keep system more stable, but system static difference disappears
Except will slow down therewith；
3) increase derivative time TdBe conducive to the response of quickening system, reduce oscillation, increase system stability, but system
The rejection ability of interference is weakened, has more sensitive response to disturbance；Excessive differential coefficient also becomes the stability of system
Difference.
Tri- parameters of PID can compensate mutually, i.e. the reduction of some parameter can be increased or reduced by other parameters to mend
It repays.Therefore with different setting parameters available identical control effect completely, this also determines that PID controller parameter is chosen
Nonuniqueness.
Therefore, passed through according to field working conditions to KP、Ti、TdOptimization, the adjusting of three pid control parameters, can be improved control
The anti-interference ability of system.From figure 3, it can be seen that the inner ring that PID is adjusted is desuperheat, the control of decompression valve aperture, to avoid
Adjustment process generates overshoot or oscillation, valve process aperture PV (%) and given aperture (%) controlling curve are as shown in Figure 4；
PID adjust outer ring in set temperature or pressure value and actual measurement temperature or pressure value deviation ratio, product
Divide the control mode with differential linearity combination.It can be more smart by the adjusting of PID double-closed-loop control realization vapor (steam) temperature, pressure
Deviation is adjusted in quasi- ground, so that the vapor (steam) temperature and the pressure that control the output of output pressure and temperature reducing station are more stable.
It is programmed in PLC in the present embodiment using structurized module, control task is decomposed into the mould of each standalone feature
Block, tissue block (OB block) needs to call separate functional blocks using CALL instruction in normal program operation.In specific implementation, use
The OB1 tissue block that Siemens STEP 7 is provided is as main program, to repid cut-off valve, desuperheat (decompression) regulating valve, diffusion valve point
Other programmed function block FC1, FC2 and FC3, functional block FC2 recall FB58 (PID) functional block, as shown in Figure 5.Pass through structuring
The control program of module programming completes control task, and structure is simply easy to maintain.
The automatic control system is applied on 1# billet caster pressure and temperature reducing station first, about by practice operation
2 years, automatic control system performance was stablized, and control efficiency is high, and temperature, the pressure of warm pressure-reducing station output steam are stablized, achieve compared with
Good economic benefit and social benefit.
Claims (5)
1. vacuum pressure and temperature reducing station automatic control system, which is characterized in that
It include: PLC controller, temperature reducing regulation valve, decompression valve, repid cut-off valve, diffusion valve, temperature transmitter, pressure change
Send device and flow transmitter；The temperature transmitter, pressure transmitter and flow transmitter with the input of PLC controller
End electrical connection；The temperature reducing regulation valve, decompression valve, repid cut-off valve and diffusion valve are electric with the output end of PLC controller
Connection；The temperature reducing regulation valve, decompression valve, temperature transmitter, pressure transmitter and flow transmitter are all made of intelligence
Instrument.
2. vacuum pressure and temperature reducing as described in claim 1 station automatic control system, which is characterized in that
The PLC controller realizes that vapor (steam) temperature, pressure are adjusted using PID double-closed-loop control；Wherein, the inner ring of PID adjusting is
Desuperheat, the control of decompression valve aperture, the outer ring that PID is adjusted is by set temperature or the temperature or pressure of pressure value and actual measurement
It is worth the ratio of deviation, the control mode of integral and differential linearity combination.
3. vacuum pressure and temperature reducing as described in claim 1 station automatic control system, which is characterized in that
The PLC controller uses Siemens S7-1500PLC.
4. vacuum pressure and temperature reducing as described in claim 1 station automatic control system, which is characterized in that
Control program in the PLC controller is programmed using structurized module, and control task is decomposed into each standalone feature
Module, in normal program operation, tissue block calls separate functional blocks by using CALL instruction.
5. vacuum pressure and temperature reducing as described in claim 1 station automatic control system, which is characterized in that
The PLC controller includes the rack and rack-mounted CPU module, power supply mould using the mode that is horizontally mounted
Block, 4 digital quantity input modules, 1 digital quantity output module, 2 Analog input mModules and 1 analog output module；
4 digital quantity input modules, 1 digital quantity output module, 2 Analog input mModules and 1 analog output
Module is connect with the CPU module by core bus；The power module provides power supply for PLC controller and supports；
The configuration mode of the PLC controller are as follows: operation button, selection switch, valve limit signal enter digital quantity input mould
Block acquisition；Stop valve ON/OFF signal, valve reach a limit/pass in place the limit and sound and light alarm signal from digital output mould
Block output；Temperature, pressure, flow, liquid level signal enter Analog input mModule acquisition；Temperature reducing regulation valve control signal, decompression
Regulating valve controls the output of signal from analog amount output module.
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| CN201910838536.3A CN110442175A (en) | 2019-09-05 | 2019-09-05 | Vacuum pressure and temperature reducing station automatic control system |
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| CN201910838536.3A CN110442175A (en) | 2019-09-05 | 2019-09-05 | Vacuum pressure and temperature reducing station automatic control system |
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| US20140151908A1 (en) * | 2012-12-04 | 2014-06-05 | Control Components, Inc. | Desuperheater with flow measurement |
| CN103315382A (en) * | 2013-06-19 | 2013-09-25 | 浙江中烟工业有限责任公司 | Cascaded PID based charging moisture control device in tobacco shred processing technology |
| CN103423740A (en) * | 2013-08-05 | 2013-12-04 | 浙江大学 | System and method for automatically controlling combustion process of circulating fluidized bed boiler |
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