CN105546572B - A kind of vertical annealing furnace burning zone automatic temperature control system and its method - Google Patents

A kind of vertical annealing furnace burning zone automatic temperature control system and its method Download PDF

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Publication number
CN105546572B
CN105546572B CN201610007364.1A CN201610007364A CN105546572B CN 105546572 B CN105546572 B CN 105546572B CN 201610007364 A CN201610007364 A CN 201610007364A CN 105546572 B CN105546572 B CN 105546572B
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air
control
burning
fuel ratio
natural gas
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CN105546572A (en
Inventor
王艳凯
彭卫革
贾磊
王鑫
宋鹏宇
陆需飞
张红雷
祖怀礼
齐保杰
马贵岩
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Beijing Shougang Automation Information Technology Co., Ltd
Beijing Huaxia Shouke Technology Co Ltd
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BEIJING SHOUGANG AUTOMATION INFORMATION TECHNOLOGY Co Ltd
Beijing Huaxia Shouke Technology Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/18Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00Process control or regulation for heat treatments
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • F23N1/04Regulating fuel supply conjointly with air supply and with draught
    • F23N1/042Regulating fuel supply conjointly with air supply and with draught using electronic means

Abstract

The invention discloses a kind of vertical annealing furnace burning zone automatic temperature control system, belong to annealing furnace technical field of metallurgical control.The automatic control system includes terminal, programmable controller, Combustion System unit, regulating valve, Zirconium oxide analyzer and calorimetry instrument.Disclosed herein as well is a kind of method for controlling annealing furnace burning zone temperature, in annealing furnace combustion process, to burning zone using based on chemically correct fuel, it is combined to obtain with calorimetry instrument with Zirconium oxide analyzer and actually uses air-fuel ratio, so as to realizes the optimum control to belt steel temperature in annealing furnace.The advantage of the invention is that improving the temperature controlled precision of annealing furnace burning zone, being smoothed out for production is ensure that, production fuel has been saved, has reduced environmental pollution.

Description

A kind of vertical annealing furnace burning zone automatic temperature control system and its method
Technical field
The invention belongs to annealing furnace technical field of metallurgical control, more particularly to a kind of vertical annealing furnace burning zone temperature is automatic Control system and its method.
Background technology
Annealing furnace be aluminize, part important in zinc production line, its control system carry as annealing process and plating Aluminium, zinc technology provide the vital task of suitable temperature and quality.To meet the requirement in market, high intensity is aluminized, the matter of zinc strip Measure and the quality requirement of coating also more and more higher.Due to the complexity of annealing furnace combustion process, hysteresis quality and process equipment Limitation, at present, annealing furnace combustion system control temperature by the natural gas using every section of governor valve control and the flowrate proportioning of air Degree, it is transitioned into and is controlled by burner using the ratio of optimal power control combustion gas and air.Natural gas and air of the prior art Ratio combustion control effect is poor, and temperature control precision is not high, the control system for this large time delay that burnt for annealing furnace, at present The most frequently used method is realized using PID regulator, and air-fuel ratio is the major parameter of combustion system, and the setting of air-fuel ratio is logical Cross what is manually realized, realize the control action to furnace temperature of annealing, its control accuracy increases, and does not account for combustion gas heat The factor of value, cause in the case where fuel gases calorific value is unstable, temperature control precision is still undesirable, and endless due to burning Entirely, problem of environmental pollution caused by is also than more serious.
The content of the invention
It is an object of the invention to provide a kind of vertical annealing furnace burning zone automatic temperature control system and its method, content It is the technology pattern using on/off controls, by the way of Zirconium oxide analyzer is increased, there is provided it is vertical how one kind is realized A kind of temperature controlled optimal control system of annealing furnace burning zone and its method.A kind of vertical annealing furnace burning proposed by the present invention Section automatic temperature control system, it is characterised in that:The automatic control system includes:Control centre, control module, TEMP Device, radiant tube, burner flue, Zirconium oxide analyzer, caloric value instrument, natural gas adjusting valve, air control valve, flow sensor, combustion Burn control unit;One of natural gas adjusting valve and air control valve are one group, respectively with a flow sensor phase Connection, annealing furnace burning zone include initial heating section, end of a period bringing-up section, soaking zone;Zirconium oxide analyzer is arranged on initial heating On the burner flue of section;Caloric value instrument is arranged on natural gas main road;Vertical annealing furnace includes multiple burners, and each burner includes One combustion controller, is controlled to the switch of burner, realizes the heating process to burning zone, and initial heating section and end of a period add Hot arc is divided into multiple combustion zones again, each combustion zone respectively one natural gas adjusting valve of installation and an air control valve and One temperature sensor;The top and the bottom of one soaking zone are respectively installed by one temperature sensor;Control module passes through communication network It is connected with Zirconium oxide analyzer, caloric value instrument, temperature sensor, flow sensor, natural gas adjusting valve and air control valve;Institute State control module and receive the measurement data that Zirconium oxide analyzer, caloric value instrument, temperature sensor, flow sensor are sent, and will control Instruction processed is sent to natural gas adjusting valve and air control valve;Zirconium oxide analyzer measures the residual oxygen content of the burning zone, heat It is worth the composition of natural gas and the content of each composition of instrument measurement natural gas main, and the calorific value signal of natural gas is calculated;Stream Quantity sensor measures the flow of natural gas and air, the temperature of temperature sensor measurement burning zone;Control module receives zirconium oxide Residual the oxygen content signal and calorific value signal that analyzer and caloric value instrument measure, each combustion zone that flow sensor measures it is natural The actual flow of gas, air, and the temperature value that temperature sensor measures, are calculated, excess air coefficient by chemically correct fuel Calculating, air-fuel ratio calculate, residual oxygen correction calculates, actual use air-fuel ratio calculates, to natural gas adjusting valve and air control valve Control signal is sent, the aperture of valve is controlled, is matched with reaching rational air-fuel;The control centre and control mould Block, temperature sensor, Zirconium oxide analyzer, caloric value instrument, natural gas adjusting valve, air control valve, flow sensor, Combustion System The field apparatus such as device realize communication connection, and the configuration setting of above-mentioned field apparatus is completed using configuration software, realize to above-mentioned The independent control of field apparatus and centralized displaying.
Further, the control module uses on/off combustion control mode, i.e., complete by being carried out to each burner Open or the mode of fully closed control, according to the burner quantity and the burning capacity of each burner in region, pass through burner combustion quantity Calculating, burning time calculate and the burning interval time calculates, and obtain between regional burner combustion quantity, burning time and burning Every the time, and these parameters are sent on the controller of the corresponding burner of regional.
Further the control centre can obtain temperature sensor, Zirconium oxide analyzer, caloric value instrument, flow sensor The associated control parameters of the measurement data and natural gas adjusting valve, air control valve and the combustion controller that measure, and can be with Specific control parameter modification and setting, control centre are carried out to natural gas adjusting valve, air control valve and combustion controller The data of control module can also be obtained, and edlin is entered to the parameter and program of control module.
Further, the control centre uses EI-TEK industrial computers, and operating system is Microsoft Windows Pro 7SP1; Configuration software is using Siemens's Wincc7.0SP3 versions, for being monitored the configuration of picture to technological process.
The present invention also proposes a kind of vertical annealing furnace burning zone automatic temperature control system, the automatic control system bag Include:
Chemically correct fuel computing unit, according to the actual percentage for measuring the composition and each composition that draw combustion gas of calorimetry instrument Than content, using the chemical equation of each composition and oxygen reaction of measurement, according to the natural gas that 5 groups of composition difference are larger, obtain To the relation of required air-fuel ratio and calorific value, linear process finally is carried out to calorific value and air-fuel ratio, calorific value can be calculated and exist Continuous corresponding chemically correct fuel when in certain limit;
Excess air coefficient computing unit, it performs excess air coefficient and calculated:μ=μ0+Δμ+μo2;Wherein μ 0 is theoretical Excess air coefficient, Δ μ are the compensation of low discharge excess air coefficient, and μ o2 are residual oxygen corrections;Described residual oxygen correction is:Wherein O2.mv is the output valve of residual oxygen process values and set value calculation device, single Position is percentage, and k1 is contribution rate, and k2 is gain coefficient, and Bias is deviation compensation;
Air-fuel ratio computing unit, it performs air-fuel ratio and calculated:A=Ao×μ;Wherein A0 is chemically correct fuel, and μ is superfluous empty Gas coefficient;
Air-fuel ratio computing unit is actually used, it performs actual use air-fuel ratio and calculated:Actually use air-fuel ratio=theory Air-fuel ratio * excess air coefficients+residual oxygen quickly compensates;Described residual oxygen quickly compensates=(setting residual oxygen value-residual oxygen process values) * Residual oxygen penalty coefficient.
Burner combustion amount calculation unit, it performs burner combustion quantity and calculated:M=W × k;Wherein W is required for burning Power, k be place bringing-up section respective regions coefficient;
Burning time computing unit, it performs burning time calculating:T1=W × a+b;Wherein W is the work(required for burning Rate, a are the coefficient of the respective regions of place bringing-up section, and b is the time bias parameter of region;
Burning interval time calculating unit, it performs the calculating of burning interval time:T2=W × c+d;Wherein W is institute of burning The power needed, c are the coefficient of the respective regions of place bringing-up section, and d is the time bias parameter of region.
The present invention also proposes a kind of vertical annealing furnace burning zone temperature automatic control method, and it uses any of the above-described automatic Control system is realized, is specifically comprised the following steps:
Step 1:The control centre of installation control system and the software and hardware of field apparatus, established and controlled by Ethernet Communication between center and field apparatus, and effective control of the control centre to field apparatus is realized by configuration software.
Step 2: a gas discharge, air mass flow root are set to every group of natural gas in annealing furnace and air control valve Calculated automatically according to air-fuel ratio;
Step 3: after heating starts, each flow sensor, temperature sensor and Zirconium oxide analyzer, caloric value instrument are to control Module sends real time data;
Step 4: control module is calculated by chemically correct fuel, excess air coefficient calculates, air-fuel ratio is calculated and actually made Calculated with air-fuel ratio, draw every group of natural gas and AIR Proportional, using on/off combustion control mode, i.e., by each burning Mouth carries out the mode of standard-sized sheet or fully closed control, according to the burner quantity and the burning capacity of each burner in region, passes through burner Quantity of burning calculates, burning time calculates and the burning interval time calculates, and obtains regional burner combustion quantity, burning time With the burning interval time;
Step 5: control module is by burner combustion quantity, burning time and the burning interval of the regional being calculated Time is sent to the combustion controller of the corresponding burner of regional.The stream of natural gas is calculated according to burner combustion quantity Setting value is measured, control module controls data on flows with air according to the flow setting value of natural gas according to actual use air-fuel ratio, And it is sent to every group of regulating valve;
Step 6: control centre each field apparatus running status, control parameter are shown on configuration software and Monitoring.
Further, the specific of step 4 is calculated as follows:
Described chemically correct fuel calculates:According to calorimetry instrument it is actual measure draw combustion gas composition and each composition hundred Point than content, using the chemical equation of each composition and oxygen reaction of measurement, according to the natural gas that 5 groups of composition difference are larger, Required air-fuel ratio and the relation of calorific value are obtained, linear process finally is carried out to calorific value and air-fuel ratio, calorific value can be calculated Continuous corresponding chemically correct fuel when within the specific limits;
Described excess air coefficient calculates:μ=μ0+Δμ+μo2;Wherein μ 0 is theoretical excess air coefficient, and Δ μ is small Flow excess air coefficient compensates, and μ o2 are residual oxygen corrections;
Air-fuel ratio calculates:A=Ao×μ;Wherein A0 is chemically correct fuel, and μ is excess air coefficient;
Described residual oxygen correction is:Wherein O2.mv is residual oxygen process The output valve of value and set value calculation device, unit is percentage, and k1 is contribution rate, and k2 is gain coefficient, and Bias is deviation compensation;
Described actual use air-fuel ratio calculates:Actually use air-fuel ratio=chemically correct fuel * excess air coefficients+residual oxygen Quick compensation;
Described residual oxygen quickly compensates the=residual oxygen penalty coefficients of (setting residual oxygen value-residual oxygen process values) *;
Wherein, theoretical air coefficient of excess μ 0, determined by design or by being manually entered, 1.06≤μ 0≤1.18;Low discharge 0.01≤Δ of coefficient of excess air μ≤0.016;A0 chemically correct fuels are 8.83:1, provided by design or technique;O2.mv is residual The controller output valve of oxygen process values and setting value, the output of controller are the percentage of 0-100 scopes;Coefficient k 1, k2 are warp Test value, 0.8≤k1≤0.9;0.8≤k2≤1.0;Deviation compensation 0.0≤Bias≤0.02;Residual oxygen setting value, by operating personnel Setting;Residual detection signal of the oxygen process values from field oxidation zirconium analyzer;1.0<Residual oxygen penalty coefficient<1.08.Described T1 Value range be 120≤T1≤20;Described T2 value range is 10≤T2;Described m value range is 20≤m≤10;
Described burner combustion quantity calculates:M=W × k;Wherein W is the power required for burning, and k is place bringing-up section Respective regions coefficient;
Described burning time calculates:T1=W × a+b;Wherein W is the power required for burning, and a is place bringing-up section The coefficient of respective regions, b are the time bias parameter of region;
The described burning interval time calculates:T2=W × c+d;Wherein W is the power required for burning, and c heats for place The coefficient of the respective regions of section, d are the time bias parameter of region.
Further, the specific implementation steps of step 1 are as follows:
(1) installation control system software:Operating system, the SIEMENS Automation programming software of computer programming terminal are installed And monitoring software;Using magnificent industrial computer is ground, operating system is Microsoft Windows XP SP3 for control centre;What programming software used It is Siemens's Step 7V5.4 versions, programming software is used to carry out hardware configuration and programming to control module;Configuration software uses Be Siemens's Wincc7.0SP3 versions, for being monitored the configuration of picture to technological process;
(2) installation control system hardware:Installation and the type of hardware configured in programming software described in (1) in switch board The module and other control devices consistent with version, complete the rigid line connection between equipment in cabinet;Row of channels is entered to control module Set, selection input, the signal type of output channel, and make a record, be applied to programming software;
(3) programming software:Completed in programming software to the corresponding configuration of control module hardware, and with it is actual in (2) The type of the control module hardware of installation is consistent with version;Set according to the passage of the control module module described in (2), input And output type, software is configured accordingly, the programing work of control system is completed according to technological requirement;
(4) configuration software:In terminal, technological process configuration is carried out using the configuration software described in (1), it is real The now control to field apparatus and parameter display function;
(5) erecting bed equipment:Flowmeter, pressure sensor including scene, temperature sensor, caloric value instrument, residual oxygen The signal detection apparatus such as analyzer and regulating valve;Realize that field apparatus is correctly connected with the terminal in switch board;
(6) communication network is established:By the connection of Ethernet, in programming software described in (1), configuration software, (2) Field apparatus is connected as a control system described in the control module and (5), so as to realize residual oxygen content in control burner hearth Required hardware and software basis;Ether network parameters are set and select communication mode, are communicated using ISO communication modes, are examined Survey the actual connection line of Ethernet being connected with control module;
(7) system communication:At the scene after equipment installation, according to the requirement of control system, realize and programmed described in (1) Communication function between software, configuration software, field apparatus described in the control module described in (2) and (5), is completed to scene Corresponding relation between detection signal, programming software and configuration software home address.
Further, the specific implementation method of step 5 is as follows:
According to actual use air-fuel ratio, automatic residual Control for Oxygen Content is carried out to natural gas and air flow rate adjustment valve, and most Determine P, I parameter eventually and control the regulation process of amplitude limit;Wherein 1 natural gas and 1 air control valve are one group of regulating valve:
(1) P and I parameters:To every group of natural gas and the adjuster of air control valve, a natural gas flow is set manually Amount, the process control to residual oxygen content is realized according to setting flow;A flow control selections device, selector are needed when implementing It is to be realized by the button of picture, the wherein scope of natural gas and air control valve P and I parameter:0.001≤P≤ 0.006,30≤I≤80;
(2) amplitude limit is controlled:Fed back according to gas discharge process values, air mass flow process values and throttle position, with reference to Technique determines natural gas, the upper limit value and lower limit value of air controller regulation.The discharge process value of natural gas and air is to measuring flow Obtained after carrying out temperature and pressure compensation, wherein, 20.0≤natural gas adjusting valve adjustable range≤60.0,10.0≤air adjustment Valve regulation scope≤65.0;
(3) air-fuel ratio range:Pid parameter regulation is carried out to natural gas and air control valve according to actual use air-fuel ratio, Realize to actually using the utilization of air-fuel ratio, and reach the control effect needed for technique;The scope of air-fuel ratio is:7.86≤theoretical Air-fuel ratio≤9.58.
(4) burner combustion quantity:M=W × k;Wherein W is the power required for burning, and k is the respective area of place bringing-up section The coefficient in domain.
(5) burning time:T1=W × a+b;Wherein W is the power required for burning, and a is the respective area of place bringing-up section The coefficient in domain, b are the time bias parameter of region.
(6) the burning interval time:T2=W × c+d;Wherein W is the power required for burning, and c is the phase of place bringing-up section The coefficient in region is answered, d is the time bias parameter of region.
Further step 6 specific implementation step is as follows:
(1) control mode is selected:There is a select button to be used for selecting the control mode of regulating valve, i.e., manually and automatically Pattern switching;System, which can be realized, manually modifies to P and I parameters, debugs, and has a button to realize the control to P and I Model selection, i.e. parameter input or not Input Mode;
(2) excess air coefficient:There are the manual/auto pattern switching that a select button realizes excess air coefficient, root According to rhythm of production and heat the factors such as steel grade and set, excess air coefficient can be manually set in picture, also can oneself Dynamic setting excess air coefficient;
(3) air-fuel ratio is actually used:There is the manual/auto switching push button of the residual oxygen input air-fuel ratio of a selection, there is one Calorific value puts into the manual/auto switching push button of air-fuel ratio, there is the numerical value display window of an actual use air-fuel ratio;
(4) caloric value instrument control model:Calorific value automatic mode described in (3) is selected, then calculates theoretical air-fuel ratio, uses theory Air-fuel ratio calculates actual use air-fuel ratio;Otherwise manual mode is selected, it is empty as actual use using the air-fuel ratio manually set Combustion ratio;
(5) Zirconium oxide analyzer control model:Residual oxygen content automatic mode described in (3) is selected, is contained according to residual oxygen is set Amount and residual oxygen content process values calculate required correction;Otherwise manual mode, correction zero are selected;
(6) actual interface content:The data content of display has heating value of natural gas, chemically correct fuel, residual oxygen process values, residual oxygen Setting value, actual use air-fuel ratio and residual oxygen quickly compensate;
(7) temp-controled mode:There is the manual/auto switching push button of input of a selective combustion control unit, there is one On/off mode selecting buttons, there is a regional temperature control model button, represent each region according to temperature feedback value conduct Automatically control the temperature of one's respective area;There is a strip temperature control mode selecting button, representing the temperature control of all areas is Using the Outlet Temperature value of the bringing-up section as reference value;
(8) air-fuel ratio is put into:There is an ejection picture each temperature-controlled zones, there is an artificial setting value of air-fuel ratio, There is an air-fuel ratio actual value;There is an air-fuel ratio to put into manual/auto button, represent artificial setting air-fuel ratio manually, from The dynamic actual mixing ratio for representing to be drawn according to Zirconium oxide analyzer is input;
(9) display content of Combustion System unit:There is the dispaly state picture of the Combustion System unit of an ejection, including Electric current, flame sensing signal, the state of a control of gas valve and fault-signal;
(10) burn picture:There are an ejection picture, including the quantity of the burning burner in the region, combustion in each control area Burn the time and dwell time is shown;And the display of the state progress different colours to each burner.
Beneficial effects of the present invention:
The present invention is a set of automatic control system applied to vertical annealing furnace burning zone temperature controlled processes, with natural gas To actually use air-fuel ratio for control object, control, realize that residual oxygen content parameter is optimal in burner hearth with air flow rate adjustment valve Automatic control system.The system is started with from solving automatically controlling for combustion process, finally realizes the temperature of vertical annealing furnace burning zone Degree control is fluctuated in optimized scope.The utilization rate of annealing furnace natural gas is improved, reduces the pollution to environment.
This method pays close attention to the change of annealing furnace burning zone temperature all the time, according to current combustion requirements, is accurately determined ginseng With the gas discharge of burning and the zone of reasonableness of air mass flow, the rational proportion of fuel and air is determined, reduces air dirt Dye.
Emphasis of the present invention realizes that the temperature control of vertical annealing furnace burning zone is optimal, realizes residual oxygen in radiant tube smoke discharging pipe The reasonability of content, emphasis solve temperature controlled automatic realization in combustion process, avoid human intervention to greatest extent, mitigate The working strength of operating personnel.
Brief description of the drawings
Fig. 1 is the general frame figure of the vertical annealing furnace of the specific embodiment of the invention.
Fig. 2 is the procedure logical control system figure of actual use air-fuel ratio.
Fig. 3 is the part structure diagram that the regional temperature of initial heating section controls.Wherein:Temperature sensor 1;Radiant tube 2;Cigarette Road 3;Zirconium oxide analyzer 4;Caloric value instrument 5;Natural gas adjusting valve 6;Air control valve 7;Flow sensor 8;Combustion System unit 9。
Embodiment
The vertical annealing furnace burning zone automatic temperature control system of the present invention is carried out with specific embodiment below detailed Explanation.In one embodiment, the vertical annealing furnace burning zone automatic temperature control system includes:Control module, temperature pass Sensor 1, radiant tube 2, burner flue 3, Zirconium oxide analyzer 4, caloric value instrument 5, natural gas adjusting valve 6, air control valve 7, flow Sensor 8, Combustion System unit 9.One natural gas adjusting valve 6 and air control valve 7 are one group, respectively with a flow Sensor 8 is connected.Annealing furnace burning zone includes initial heating section, end of a period bringing-up section, soaking zone.Zirconium oxide analyzer 4 is installed On a burner flue 3 of initial heating section;Caloric value instrument 4 is arranged on natural gas main road, referring specifically to Figure of description 3;
In one embodiment, the vertical annealing furnace includes multiple burners, such as 135 burners, each burner include One combustion controller 9, is controlled to the switch of burner, realizes the heating process to burning zone, initial heating section and end of a period Bringing-up section is divided into multiple combustion zones, generally 4 again, and a natural gas adjusting valve 6 and one are respectively installed in each combustion zone Air control valve 7 and a temperature sensor.The top and the bottom of one soaking zone are respectively installed by one temperature sensor, annealing furnace Each section include two roll chambers (when each section is transitioned into another section, residing for the roller-way that changes strip traffic direction Space), totally 8 roll chambers, as shown in Figure of description 1.Aided in simultaneously in 8 roll chambers and 1 soaking zone equipped with electricity Heater completes the control function to temperature.Control module passes through communication network and Zirconium oxide analyzer 4, caloric value instrument 5, temperature Sensor 1, flow sensor 8, natural gas adjusting valve 6 are connected with air control valve 7.Control module receives Zirconium oxide analyzer 4th, the measurement data that caloric value instrument 5, temperature sensor 1, flow sensor 8 are sent, and control instruction is sent to natural gas regulation Valve 6 and air control valve 7.Zirconium oxide analyzer 4 measures the residual oxygen content of the burning zone, and caloric value instrument 5 measures natural gas main The composition of natural gas and the content of each composition, and the calorific value signal of natural gas is calculated, the content of each composition is percentage, The unit of calorific value is KJ/m3, calculated for chemically correct fuel.Flow sensor 8 measures the flow of natural gas and air, and temperature passes Sensor 1 measures the temperature of burning zone.Control module receive residual oxygen content signal that Zirconium oxide analyzer 4 and caloric value instrument 5 measure with And calorific value signal, natural gas, the actual flow of air of each combustion zone that flow sensor measures, and temperature sensor are surveyed The temperature value obtained, calculated by chemically correct fuel, excess air coefficient calculates, air-fuel ratio calculates, residual oxygen correction calculates, actual Calculated using air-fuel ratio, control signal sent to natural gas adjusting valve 6 and air control valve 7, the aperture of valve is controlled, To reach rational air-fuel proportioning.Also, control module uses on/off combustion control mode, i.e., by entering to each burner Row standard-sized sheet or the mode of fully closed control, according to the burner quantity and the burning capacity of each burner in region, pass through burner combustion Quantity calculates, burning time calculates and the burning interval time calculates, and obtains regional burner combustion quantity, burning time and combustion Interval time is burnt, and these parameters are sent on the controller of the corresponding burner of regional.
In one embodiment, natural gas adjusting valve 6 and air control valve 7 include PID controller, and the aperture of valve is entered Row regulation.
In one embodiment, control module is PLC control modules, can also include any other and may be programmed to realize control The processor or host computer of function processed.
In one embodiment, the temperature controlled automatic control system of annealing furnace burning zone of the invention also includes in control The heart, the control centre and control module, temperature sensor 1, Zirconium oxide analyzer 4, caloric value instrument 5, natural gas adjusting valve 6, sky The field apparatus such as gas regulating valve 7, flow sensor 8, combustion controller 9 realize communication connection, and are completed using configuration software The configuration for stating field apparatus is set, and is realized to the independent control of above-mentioned field apparatus and centralized displaying.More specifically, control centre Measurement data and the natural gas that temperature sensor 1, Zirconium oxide analyzer 4, caloric value instrument 5, flow sensor 8 measure can be obtained The associated control parameters of regulating valve 6, air control valve 7 and combustion controller 9, and natural gas adjusting valve 6, air can be adjusted Section valve 7 and combustion controller 9 carry out specific control parameter modification and setting, and control centre can also obtain control module Data, and edlin is entered to the parameter and program of control module.
In one embodiment, control centre uses EI-TEK industrial computers, and operating system is Microsoft Windows Pro7SP1;Configuration software is using Siemens's Wincc7.0SP3 versions, for being monitored the configuration of picture to technological process.
In one embodiment, one kind of the invention is applied to the temperature controlled automatic control system bag of annealing furnace burning zone Include chemically correct fuel computing unit, excess air coefficient computing unit, air-fuel ratio computing unit, actual use air-fuel ratio and calculate list Member, burner combustion amount calculation unit, burning time computing unit and burning interval time calculating unit.It performs above-mentioned respectively Chemically correct fuel in embodiment calculates, excess air coefficient calculates, air-fuel ratio calculates, actual use air-fuel ratio calculates, burner Quantity of burning calculates, burning time calculates and the burning interval time calculates.
In one embodiment, it is of the invention a kind of applied to the temperature controlled automatic control system of annealing furnace burning zone Control module includes chemically correct fuel computing unit, excess air coefficient computing unit, air-fuel ratio computing unit, actual use sky Combustion is than computing unit, burner combustion amount calculation unit, burning time computing unit and burning interval time calculating unit.Its point Chemically correct fuel that Zhi Hang be in above-described embodiment calculates, excess air coefficient calculates, air-fuel ratio calculates, actual use air-fuel ratio Calculate, burner combustion quantity calculates, burning time calculates and the burning interval time calculates.Preferably, above-mentioned computing unit passes through PLC programming realizations in control module.
The present invention also proposes a kind of vertical heater burning zone temperature automatic control method, and it uses any of the above-described embodiment In system realize, specifically comprise the following steps:
Step 1:The control centre of installation control system and the software and hardware of field apparatus, established and controlled by Ethernet Communication between center and field apparatus, and effective control of the control centre to field apparatus is realized by configuration software.
Step 2: a gas discharge, air mass flow root are set to every group of natural gas in annealing furnace and air control valve Calculated automatically according to air-fuel ratio;
Step 3: after heating starts, each flow sensor, temperature sensor and Zirconium oxide analyzer, caloric value instrument are to control Module sends real time data;
Step 4: control module is calculated by chemically correct fuel, excess air coefficient calculates, air-fuel ratio is calculated and actually made Calculated with air-fuel ratio, draw every group of natural gas and AIR Proportional, using on/off combustion control mode, i.e., by each burning Mouth carries out the mode of standard-sized sheet or fully closed control, according to the burner quantity and the burning capacity of each burner in region, passes through burner Quantity of burning calculates, burning time calculates and the burning interval time calculates, and obtains regional burner combustion quantity, burning time With the burning interval time;
Step 5: control module is by burner combustion quantity, burning time and the burning interval of the regional being calculated Time is sent to the combustion controller of the corresponding burner of regional.The stream of natural gas is calculated according to burner combustion quantity Setting value is measured, control module controls data on flows with air according to the flow setting value of natural gas according to actual use air-fuel ratio, And it is sent to every group of regulating valve;
Step 6: control centre each field apparatus running status, control parameter are shown on configuration software and Monitoring.
More specifically, in one embodiment, the specific of step 4 is calculated as follows:
Described chemically correct fuel calculates:According to calorimetry instrument it is actual measure draw combustion gas composition and each composition hundred Point than content, using the chemical equation of each composition and oxygen reaction of measurement, according to the natural gas that 5 groups of composition difference are larger, Required air-fuel ratio and the relation of calorific value are obtained, linear process finally is carried out to calorific value and air-fuel ratio, calorific value can be calculated Continuous corresponding chemically correct fuel when within the specific limits;
Described excess air coefficient calculates:μ=μ0+Δμ+μo2;Wherein μ0It is theoretical excess air coefficient, Δ μ is small Flow excess air coefficient compensates, μ o2It is residual oxygen correction;
Air-fuel ratio calculates:A=Ao×μ;Wherein A0It is chemically correct fuel, μ is excess air coefficient;
Described residual oxygen correction is:Wherein O2.mv it is residual oxygen process The output valve of value and set value calculation device, unit are percentage, k1It is contribution rate, k2It is gain coefficient, Bias is deviation compensation;
Described actual use air-fuel ratio calculates:Actually use air-fuel ratio=chemically correct fuel * excess air coefficients+residual oxygen Quick compensation;
Described residual oxygen quickly compensates the=residual oxygen penalty coefficients of (setting residual oxygen value-residual oxygen process values) *.
Wherein, theoretical air coefficient of excess μ0, determined by design or by being manually entered, 1.06≤μ0≤1.18;Low discharge is empty Gas 0.01≤Δ of coefficient of excess μ≤0.016;A0Chemically correct fuel is 8.83:1, provided by design or technique;O2.mv it is residual oxygen mistake The controller output valve of journey value and setting value, the output of controller are the percentage of 0-100 scopes;Coefficient k1、k2For empirical value, 0.8≤k1≤0.9;0.8≤k2≤1.0;Deviation compensation 0.0≤Bias≤0.02;Residual oxygen setting value, is set by operating personnel;It is residual Detection signal of the oxygen process values from field oxidation zirconium analyzer;1.0<Residual oxygen penalty coefficient<1.08.Described T1Value range For 120≤T1≤20;Described T2Value range be 10≤T2;Described m value range is 20≤m≤10.
In one embodiment, described burner combustion quantity calculates:M=W × k;Wherein W is the power required for burning (being provided by annealing furnace second control system), k are the coefficient of the respective regions of place bringing-up section.
Described burning time calculates:T1=W × a+b;Wherein W is the required power of burning (by annealing furnace two level control System processed provides), a is the coefficient of the respective regions of place bringing-up section, and b is the time bias parameter of region.
The described burning interval time calculates:T2=W × c+d;Wherein W is the required power of burning (by annealing furnace two Level control system provides), c is the coefficient of the respective regions of place bringing-up section, and d is the time bias parameter of region.
In one embodiment, the specific implementation steps of step 1 are as follows:
(1) installation control system software:Operating system, the SIEMENS Automation programming software of computer programming terminal are installed And monitoring software.Using magnificent industrial computer is ground, operating system is Microsoft Windows XP SP3 for control centre;What programming software used It is Siemens's Step 7V5.4 versions, programming software is used to carry out PLC hardware configurations and programming to PLC control system;Configuration is soft Part is using Siemens's Wincc7.0SP3 versions, for being monitored the configuration of picture to technological process.
(2) installation control system hardware:Installation and the control module configured in programming software described in (1) in switch board The type of hardware module consistent with version and other control devices, complete the rigid line connection between equipment in cabinet;To control module Enter row of channels setting, selection input, the signal type of output channel, and make a record, be applied to programming software.
(3) configuration software:Completed in programming software to the corresponding configuration of control module hardware, and with it is actual in (2) The type of the control module of installation is consistent with version;Set according to the passage of the control module described in (2), input and output class Type, software is configured accordingly, the programing work of control system is completed according to technological requirement.
(4) configuration software:In control centre, technological process configuration is carried out using the configuration software described in (1), is realized Control and parameter display function to field apparatus.
(5) erecting bed equipment:Flowmeter, pressure sensor including scene, temperature sensor, caloric value instrument, residual oxygen The signal detection apparatus such as analyzer and regulating valve;Realize that field apparatus is correctly connected with the terminal in switch board.
(6) communication network is established:By the connection of Ethernet, in programming software described in (1), configuration software, (2) Field apparatus is connected as a control system described in the control module and (5), so as to realize residual oxygen content in control burner hearth Required hardware and software basis;Ether network parameters are set and select communication mode, are communicated using ISO communication modes, are examined Survey the actual connection line of Ethernet being connected with control module.
(7) system communicates:At the scene after equipment installation, according to the requirement of control system, realize and programmed described in (1) Communication function between software, configuration software, field apparatus described in the control module described in (2) and (5), is completed to scene Corresponding relation between detection signal, programming software and monitoring software home address.
In one embodiment, as shown in Figure of description 2, the specific implementation step of step 4 is as follows.
(1) chemically correct fuel calculates:The design air-fuel ratio of the heating furnace is 8.23:1 (air capacity:Amount of natural gas). In the present embodiment, chemically correct fuel is real-time change, is calculated according to the composition and ratio of calorimetry instrument, is utilized CO、H2And CH4The volume of required oxygen (air) is calculated in chemical equation Deng gas (being defined by actual measure), and counts Calculation draw corresponding amount of natural gas need corresponding to air capacity, i.e., described in air-fuel ratio, in the range of 7.86≤chemically correct fuel≤ 9.58, and be applied in real time in above-mentioned PLC system.
(2) excess air coefficient calculates:μ=μ0+Δμ+μo2;Wherein μ is excess air coefficient, μ0It is theoretical excess air Coefficient, 1.06≤μ0≤1.18;Δ μ low discharges excess air coefficient compensates, 0.01≤Δ μ≤0.016;μo2It is residual oxygen amendment Amount, -0.06≤μ o2≤0.06。
(3) air-fuel ratio calculates:A=Ao×μ;Wherein A0It is chemically correct fuel, μ is excess air coefficient.
(4) residual oxygen correction calculates:Wherein O2.mv it is residual oxygen process values With the output valve of set value calculation device;K1It is contribution rate;K2It is gain coefficient;Bias is deviation compensation.Wherein 50 be according to residual oxygen The output of analyzer-controller obtains, it is known that the upper and lower limit of the controller is 70 and 30, due to (30+70)/2=50;In practice, k1,k2If be all set to 0.01 for 0.86, Bias.
(5) air-fuel ratio is actually used to calculate:Actual use air-fuel ratio=chemically correct fuel * coefficient of excess+residual oxygen is quickly mended Repay.Scope:7.86≤actual use air-fuel ratio≤9.58, wherein:- 0.1≤residual oxygen quickly compensates≤0.1, and residual oxygen quickly compensates The residual oxygen penalty coefficients of=(setting residual oxygen value-residual oxygen process values) *.Actual use is calculated according to the air-fuel ratio of initial heating section Air-fuel ratio, and the air-fuel ratio is put into other temperature-controlled zones.
(6) burner combustion quantity:M=W × k;Wherein W is the required power of burning (by annealing furnace second control system There is provided), k is the coefficient of the respective regions of place bringing-up section.
(7) burning time:T1=W × a+b;Wherein W is that the power required for burning (is carried by annealing furnace second control system For), a is the coefficient of the respective regions of place bringing-up section, and b is the time bias parameter of region.
(8) the burning interval time:T2=W × c+d;Wherein W is the required power of burning (by annealing furnace Two-stage control system System provides), c is the coefficient of the respective regions of place bringing-up section, and d is the time bias parameter of region.
In one embodiment, the specific implementation step of step 5 is as follows:According to actual use air-fuel ratio, to natural gas and Air flow rate adjustment valve carries out automatic residual Control for Oxygen Content, and finally determines P, I parameter and control the regulation process of amplitude limit.Wherein 1 natural gas and 1 air control valve are one group of regulating valve:
(1) P and I parameters:To every group of natural gas and the adjuster of air control valve, a natural gas flow is set manually Amount, the process control to residual oxygen content is realized according to setting flow;A flow control selections device, selector are needed when implementing It is to be realized by the button of picture.According to live practical application effect, natural gas and air control valve P and I are finally determined The scope of parameter, in actual applications, 0.001≤P≤0.006,30≤I≤80.
(2) amplitude limit is controlled:Fed back according to gas discharge process values, air mass flow process values and throttle position, with reference to Technique determines natural gas, the upper limit value and lower limit value of air controller regulation.The discharge process value of natural gas and air is to measuring flow Obtained after carrying out temperature and pressure compensation.In the present embodiment, 20.0≤natural gas adjusting valve adjustable range≤60.0,10.0≤sky Controlled atmosphere section valve regulation scope≤65.0.
(3) air-fuel ratio range:Pid parameter regulation is carried out to natural gas and air control valve according to actual use air-fuel ratio, Realize to actually using the utilization of air-fuel ratio, and reach the control effect needed for technique.Air-fuel is actually used in the present embodiment The scope of ratio is:7.86≤chemically correct fuel≤9.58.
(4) burner combustion quantity:M=W × k;Wherein W is the required power of burning (by annealing furnace second control system There is provided), k is the coefficient of the respective regions of place bringing-up section.
(5) burning time:T1=W × a+b;Wherein W is that the power required for burning (is carried by annealing furnace second control system For), a is the coefficient of the respective regions of place bringing-up section, and b is the time bias parameter of region.
(6) the burning interval time:T2=W × c+d;Wherein W is the required power of burning (by annealing furnace Two-stage control system System provides), c is the coefficient of the respective regions of place bringing-up section, and d is the time bias parameter of region.
In one embodiment, step 6 specific implementation step is as follows:
(1) control mode is selected:There is a select button to be used for selecting the control mode of regulating valve, i.e., manually and automatically Pattern switching;System, which can be realized, manually modifies to P and I parameters, debugs, and has a button to realize the control to P and I Model selection, i.e. parameter input or not Input Mode.
(2) excess air coefficient:There are the manual/auto pattern switching that a select button realizes excess air coefficient, root According to rhythm of production and heat the factors such as steel grade and set.Excess air coefficient can be manually set in picture, also can be certainly Dynamic setting excess air coefficient.
(3) air-fuel ratio is actually used:There is the manual/auto switching push button of the residual oxygen input air-fuel ratio of a selection, there is one Calorific value puts into the manual/auto switching push button of air-fuel ratio, there is the numerical value display window of an actual use air-fuel ratio.
(4) caloric value instrument control model:Calorific value automatic mode described in (3) is selected, then calculates theoretical air-fuel ratio, uses theory Air-fuel ratio calculates actual use air-fuel ratio;Otherwise manual mode is selected, it is empty as actual use using the air-fuel ratio manually set Combustion ratio.
(5) Zirconium oxide analyzer control model:Residual oxygen content automatic mode described in (3) is selected, is contained according to residual oxygen is set Amount and residual oxygen content process values calculate required correction;Otherwise manual mode, correction zero are selected.
(6) actual interface content:The data content of display has heating value of natural gas, chemically correct fuel, residual oxygen process values, residual oxygen Setting value, actual use air-fuel ratio and residual oxygen quickly compensate.
(7) temp-controled mode:There is the manual/auto switching push button of input of a selective combustion control unit, there is one On/off mode selecting buttons.There is a regional temperature control model button, represent each region according to temperature feedback value conduct Automatically control the temperature of one's respective area;There is a strip temperature control mode selecting button, representing the temperature control of all areas is Using the Outlet Temperature value of the bringing-up section as reference value.
(8) air-fuel ratio is put into:There is an ejection picture each temperature-controlled zones, there is an artificial setting value of air-fuel ratio, There is an air-fuel ratio actual value;There is an air-fuel ratio to put into manual/auto button.Artificial setting air-fuel ratio is represented manually, from The dynamic actual mixing ratio for representing to be drawn according to Zirconium oxide analyzer is input.
(9) display content of Combustion System unit:There is the dispaly state picture of the Combustion System unit of an ejection, including Electric current, flame sensing signal, the state of a control of gas valve and fault-signal.
(10) burn picture:There are an ejection picture, including the quantity of the burning burner in the region, combustion in each control area Burn the time and dwell time is shown;And the display of the state progress different colours to each burner.

Claims (7)

  1. A kind of 1. vertical annealing furnace burning zone automatic temperature control system, it is characterised in that:The automatic control system includes:Control Center processed, control module, temperature sensor, radiant tube, burner flue, Zirconium oxide analyzer, caloric value instrument, natural gas adjusting valve, Air control valve, flow sensor, Combustion System unit;One of natural gas adjusting valve and an air control valve are one Group, it is connected respectively with a flow sensor, annealing furnace burning zone includes initial heating section, end of a period bringing-up section, soaking zone;Oxygen Change zirconium analyzer to be arranged on the burner flue of initial heating section;Caloric value instrument is arranged on natural gas main road;Vertical annealing furnace Including multiple burners, each burner includes a combustion controller, and the switch of burner is controlled, realizes and burning zone is added Thermal process, initial heating section and end of a period bringing-up section are divided into multiple combustion zones again, and a natural gas is respectively installed in each combustion zone Regulating valve and an air control valve and a temperature sensor;Respectively one temperature of installation passes for the top and the bottom of one soaking zone Sensor;Control module passes through communication network and Zirconium oxide analyzer, caloric value instrument, temperature sensor, flow sensor, natural controlled atmosphere Section valve is connected with air control valve;The control module receives Zirconium oxide analyzer, caloric value instrument, temperature sensor, flow and passed The measurement data that sensor is sent, and control instruction is sent to natural gas adjusting valve and air control valve;Zirconium oxide analyzer is surveyed The residual oxygen content of the burning zone is measured, caloric value instrument measures the composition of natural gas and the content of each composition of natural gas main, and counts Calculate the calorific value signal for drawing natural gas;Flow sensor measures the flow of natural gas and air, temperature sensor measurement burning zone Temperature;Control module receives residual the oxygen content signal and calorific value signal that Zirconium oxide analyzer and caloric value instrument measure, and flow passes Natural gas, the actual flow of air for each combustion zone that sensor measures, and the temperature value that temperature sensor measures, by reason Calculated by air-fuel ratio, excess air coefficient calculate, air-fuel ratio calculate, residual oxygen correction calculate, actual use air-fuel ratio calculate, it is right Natural gas adjusting valve and air control valve send control signal, and the aperture of valve is controlled, matched somebody with somebody with reaching rational air-fuel Than;The control centre adjusts with control module, temperature sensor, Zirconium oxide analyzer, caloric value instrument, natural gas adjusting valve, air Save valve, flow sensor, combustion controller field apparatus and realize communication connection, and above-mentioned field apparatus is completed using configuration software Configuration set, realize to the independent control of above-mentioned field apparatus and centralized displaying;
    The control module uses on/off combustion control mode, i.e., by carrying out standard-sized sheet or fully closed control to each burner Mode, according to the burner quantity and the burning capacity of each burner in region, calculated by burner combustion quantity, burning time counts Calculate and the burning interval time calculate, obtain regional burner combustion quantity, burning time and burning interval time, and by these Parameter is sent on the controller of the corresponding burner of regional;
    The control centre can obtain the measurement data that temperature sensor, Zirconium oxide analyzer, caloric value instrument, flow sensor measure And the associated control parameters of natural gas adjusting valve, air control valve and combustion controller, and can to natural gas adjusting valve, Air control valve and combustion controller, which carry out specific control parameter modification and setting, control centre, can also obtain control mould The data of block, and edlin is entered to the parameter and program of control module.
  2. 2. vertical annealing furnace burning zone automatic temperature control system according to claim 1, it is characterised in that:The control Center uses EI-TEK industrial computers, and operating system is the SP1 of Microsoft Windows Pro 7;Configuration software is using Siemens Wincc7.0SP3 versions, for being monitored the configuration of picture to technological process.
  3. 3. vertical annealing furnace burning zone automatic temperature control system according to claim 1, it is characterised in that described automatic Control system includes:
    Chemically correct fuel computing unit, show that the composition of combustion gas and the percentage of each composition contain according to the actual measurement of calorimetry instrument Amount, using the chemical equation of each composition and oxygen reaction of measurement, according to the natural gas that 5 groups of composition difference are larger, obtains institute The air-fuel ratio and the relation of calorific value needed, finally carries out linear process to calorific value and air-fuel ratio, calorific value can be calculated certain In the range of when continuous corresponding chemically correct fuel;
    Excess air coefficient computing unit, it performs excess air coefficient and calculated:μ=μ0+Δμ+μo2;Wherein μ0It is theoretical superfluous Air coefficient, Δ μ are that low discharge excess air coefficient compensates, μ o2It is residual oxygen correction;Described residual oxygen correction is:Wherein O2.mv it is the output valve of residual oxygen process values and set value calculation device, it is single Position is percentage, k1It is contribution rate, k2It is gain coefficient, Bias is deviation compensation;
    Air-fuel ratio computing unit, it performs air-fuel ratio and calculated:A=Ao×μ;Wherein A0It is chemically correct fuel, μ is excess air system Number;
    Air-fuel ratio computing unit is actually used, it performs actual use air-fuel ratio and calculated:Actually use air-fuel ratio=theoretical air-fuel Than * excess air coefficient+quick compensation of residual oxygen;Described residual oxygen quickly compensates=(setting residual oxygen value-residual oxygen process values) residual oxygen of * Penalty coefficient;
    Burner combustion amount calculation unit, it performs burner combustion quantity and calculated:M=W × k;Wherein W is the work(required for burning Rate, k are the coefficient of the respective regions of place bringing-up section;
    Burning time computing unit, it performs burning time calculating:T1=W × a+b;Wherein W is the power required for burning, and a is The coefficient of the respective regions of place bringing-up section, b are the time bias parameter of region;
    Burning interval time calculating unit, it performs the calculating of burning interval time:T2=W × c+d;Wherein W is that burning is required Power, c are the coefficient of the respective regions of place bringing-up section, and d is the time bias parameter of region.
  4. 4. a kind of vertical annealing furnace burning zone temperature automatic control method of system described in claim 1,2 or 3 any one, its It is characterised by, comprises the following steps:
    Step 1:The control centre of installation control system and the software and hardware of field apparatus, control centre is established by Ethernet Communication between field apparatus, and effective control of the control centre to field apparatus is realized by configuration software;It is specific real It is as follows to apply step:
    1) installation control system software:Operating system, SIEMENS Automation programming software and the prison of computer programming terminal are installed Control software;Using magnificent industrial computer is ground, operating system is Microsoft Windows XP SP3 for control centre;Programming software is using west The sub- V5.4 versions of Step 7 of door, programming software are used to carry out hardware configuration and programming to control module;Configuration software using Siemens's Wincc7.0SP3 versions, for being monitored the configuration of picture to technological process;
    2) installation control system hardware:In switch board installation with 1) described in the type of hardware that configures in programming software and version Consistent module and other control devices, complete the rigid line connection between equipment in cabinet;Enter row of channels setting, choosing to control module Input, the signal type of output channel are selected, and is made a record, is applied to programming software;
    3) programming software:Completed in programming software to the corresponding configuration of control module hardware, and with 2) in actual installation The type of control module hardware is consistent with version;Set according to the passage of the control module module described in 2), input and output Type, software is configured accordingly, the programing work of control system is completed according to technological requirement;
    4) configuration software:In terminal, technological process configuration is carried out using the configuration software described in 1), is realized to existing The control of field device and parameter display function;
    5) erecting bed equipment:Including scene flowmeter, pressure sensor, temperature sensor, caloric value instrument, residual oxygen analytical instrument and Regulating valve signal detection apparatus;Realize that field apparatus is correctly connected with the terminal in switch board;
    6) communication network is established:By the connection of Ethernet, programming software described in 1), configuration software, 2) described in control Molding block and 5) described in field apparatus be connected as a control system, it is hard needed for residual oxygen content in control burner hearth so as to realize Part and basis of software;Ether network parameters are set and select communication mode, are communicated using ISO communication modes, Detection & Controling The actual connection line of Ethernet that module is connected;
    7) system communication:At the scene after equipment installation, according to the requirement of control system, realize 1) described in programming software, Configuration software, 2) described in control module and 5) described in communication function between field apparatus, complete to believe Site Detection Number, the corresponding relation between programming software and configuration software home address;
    Step 2: setting a gas discharge to every group of natural gas in annealing furnace and air control valve, air mass flow is according to sky Combustion ratio is calculated automatically;
    Step 3: after heating starts, each flow sensor, temperature sensor and Zirconium oxide analyzer, caloric value instrument are to control module Send real time data;
    Step 4: control module is calculated by chemically correct fuel, excess air coefficient calculates, air-fuel ratio calculates and actual use is empty Combustion draws every group of natural gas and AIR Proportional, using on/off combustion control mode, i.e., by entering to each burner than calculating Row standard-sized sheet or the mode of fully closed control, according to the burner quantity and the burning capacity of each burner in region, pass through burner combustion Quantity calculates, burning time calculates and the burning interval time calculates, and obtains regional burner combustion quantity, burning time and combustion Burn interval time;
    Step 5: control module is by the burner combustion quantity for the regional being calculated, burning time and burning interval time It is sent to the combustion controller of the corresponding burner of regional;The flow that natural gas is calculated according to burner combustion quantity is set Definite value, control module control data on flows with air according to the flow setting value of natural gas according to actual use air-fuel ratio, concurrently Give every group of regulating valve;
    Step 6: each field apparatus running status, control parameter are shown and monitored on configuration software by control centre.
  5. 5. vertical annealing furnace burning zone temperature automatic control method according to claim 4, it is characterised in that:Step 4 Specifically it is calculated as follows:
    Described chemically correct fuel calculates:According to the actual percentage for measuring the composition and each composition that draw combustion gas of calorimetry instrument Content, using the chemical equation of each composition and oxygen reaction of measurement, according to the natural gas that 5 groups of composition difference are larger, obtain Required air-fuel ratio and the relation of calorific value, linear process finally is carried out to calorific value and air-fuel ratio, calorific value can be calculated one Continuous corresponding chemically correct fuel when determining in scope;
    Described excess air coefficient calculates:μ=μ0+Δμ+μo2;Wherein μ0It is theoretical excess air coefficient, Δ μ is low discharge Excess air coefficient compensates, μ o2It is residual oxygen correction;
    Air-fuel ratio calculates:A=Ao×μ;Wherein A0It is chemically correct fuel, μ is excess air coefficient;
    Described residual oxygen correction is:Wherein O2.mv it is residual oxygen process values and to set The output valve of fixed value controller, unit are percentage, k1It is contribution rate, k2It is gain coefficient, Bias is deviation compensation;
    Described actual use air-fuel ratio calculates:It is quick to actually use air-fuel ratio=chemically correct fuel * excess air coefficients+residual oxygen Compensation;
    Described residual oxygen quickly compensates the=residual oxygen penalty coefficients of (setting residual oxygen value-residual oxygen process values) *;
    Wherein, theoretical air coefficient of excess μ0, determined by design or by being manually entered, 1.06≤μ0≤1.18;Low discharge air mistake Surplus 0.01≤Δ of coefficient μ≤0.016;A0Chemically correct fuel is 8.83:1, provided by design or technique;O2.mv it is residual oxygen process values With the controller output valve of setting value, the output of controller is the percentage of 0-100 scopes;Coefficient k1、k2For empirical value, 0.8≤ k1≤0.9;0.8≤k2≤1.0;Deviation compensation 0.0≤Bias≤0.02;Residual oxygen setting value, is set by operating personnel;Residual oxygen mistake Detection signal of the journey value from field oxidation zirconium analyzer;1.0<Residual oxygen penalty coefficient<1.08;
    Described burner combustion quantity calculates:M=W × k;Wherein W is the power required for burning, and k is the phase of place bringing-up section Answer the coefficient in region;
    Described burning time calculates:T1=W × a+b;Wherein W is the power required for burning, and a is the corresponding of place bringing-up section The coefficient in region, b are the time bias parameter of region;
    The described burning interval time calculates:T2=W × c+d;Wherein W is the power required for burning, and c is place bringing-up section The coefficient of respective regions, d are the time bias parameter of region;
    Described T1Value range be 120≤T1≤20;Described T2Value range be 10≤T2;Described m value range is 20 ≤m≤10。
  6. 6. vertical annealing furnace burning zone temperature automatic control method according to claim 4, it is characterised in that step 5 Specific implementation method is as follows:
    According to actual use air-fuel ratio, automatic residual Control for Oxygen Content is carried out to natural gas and air flow rate adjustment valve, and it is final true Determine P, I parameter and control the regulation process of amplitude limit;Wherein 1 natural gas and 1 air control valve are one group of regulating valve:
    1) P and I parameters:To every group of natural gas and the adjuster of air control valve, a gas discharge is set manually, according to Set process control of the flow realization to residual oxygen content;A flow control selections device is needed when implementing, selector is to pass through The button of picture realizes, wherein the scope of natural gas and air control valve P and I parameter:0.001≤P≤0.006,30≤I ≤80;
    2) amplitude limit is controlled:Fed back according to gas discharge process values, air mass flow process values and throttle position, combined process is true Determine natural gas, the upper limit value and lower limit value of air controller regulation;The discharge process value of natural gas and air is to carry out temperature to measurement flow Obtained after degree and pressure compensation, wherein, 20.0≤natural gas adjusting valve adjustable range≤60.0,10.0≤air adjustment valve regulation Scope≤65.0;
    3) air-fuel ratio range:Pid parameter regulation, realization pair are carried out to natural gas and air control valve according to actual use air-fuel ratio The utilization of air-fuel ratio is actually used, and reaches the control effect needed for technique;The scope of air-fuel ratio is:7.86≤chemically correct fuel ≤9.58;
    4) burner combustion quantity:M=W × k;Wherein W is the power required for burning, and k is the respective regions of place bringing-up section Coefficient;
    5) burning time:T1=W × a+b;Wherein W is the power required for burning, and a is for the respective regions of place bringing-up section Number, b are the time bias parameter of region;
    6) the burning interval time:T2=W × c+d;Wherein W is the power required for burning, and c is the respective regions of place bringing-up section Coefficient, d be region time bias parameter.
  7. 7. vertical annealing furnace burning zone temperature automatic control method as claimed in claim 4, it is characterised in that step 6 is specific Implementation steps are as follows:
    1) control mode is selected:There are the control mode that a select button is used for selecting regulating valve, i.e., pattern manually and automatically Switching;System, which can be realized, manually modifies to P and I parameters, debugs, and has a button to realize the control model to P and I Selection, i.e. parameter input or not Input Mode;
    2) excess air coefficient:There is the manual/auto pattern switching that a select button realizes excess air coefficient, according to production Rhythm and heat the factors such as steel grade and set, excess air coefficient can be manually set in picture, can also be set automatically Excess air coefficient;
    3) air-fuel ratio is actually used:There is the manual/auto switching push button of the residual oxygen input air-fuel ratio of a selection, there is a calorific value to throw Enter the manual/auto switching push button of air-fuel ratio, the numerical value display window for having an actual use air-fuel ratio;
    4) caloric value instrument control model:Calorific value automatic mode described in selection 3), then calculate theoretical air-fuel ratio, use chemically correct fuel Calculate actual use air-fuel ratio;Otherwise manual mode is selected, using the air-fuel ratio manually set as actual use air-fuel ratio;
    5) Zirconium oxide analyzer control model:Residual oxygen content automatic mode described in selection 3), according to setting residual oxygen content and residual Oxygen content process values calculate required correction;Otherwise manual mode, correction zero are selected;
    6) actual interface content:The data content of display has heating value of natural gas, chemically correct fuel, residual oxygen process values, the setting of residual oxygen Value, actual use air-fuel ratio and residual oxygen quickly compensate;
    7) temp-controled mode:There is the manual/auto switching push button of input of a selective combustion control unit, there is an on/off Mode selecting button, there is a regional temperature control model button, represent each region according to temperature feedback value as automatic control The temperature of one's respective area processed;There is a strip temperature control mode selecting button, the temperature control for representing all areas is added with this The Outlet Temperature value of hot arc is reference value;
    8) air-fuel ratio is put into:There is an ejection picture each temperature-controlled zones, have an artificial setting value of air-fuel ratio, there is one Air-fuel ratio actual value;There is an air-fuel ratio to put into manual/auto button, represent artificial setting air-fuel ratio manually, it is automatic to represent The actual mixing ratio drawn according to Zirconium oxide analyzer is input;
    9) display content of Combustion System unit:Have one ejection Combustion System unit dispaly state picture, including electric current, Flame sensing signal, the state of a control of gas valve and fault-signal;
    10) burn picture:There is an ejection picture each control area, including when the quantity of the burning burner in the region, burning Between and dwell time show;And the display of the state progress different colours to each burner.
CN201610007364.1A 2016-01-06 2016-01-06 A kind of vertical annealing furnace burning zone automatic temperature control system and its method Active CN105546572B (en)

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CN106544048A (en) * 2016-09-27 2017-03-29 北京神雾环境能源科技集团股份有限公司 The heat accumulating type fast pyrogenation furnace temperature control method of control radial canal make-and-break time
CN106521110B (en) * 2016-11-07 2018-12-14 北京首钢股份有限公司 A kind of control method and device of annealing furnace burning
CN106435160B (en) * 2016-11-22 2018-11-09 首钢京唐钢铁联合有限责任公司 A kind of annealing furnace method for controlling temperature inner and system
CN106906339B (en) * 2017-02-22 2018-06-22 首钢京唐钢铁联合有限责任公司 A kind of galvanizing annealing furnace air-fuel ratio correction method
CN107971045A (en) * 2017-11-30 2018-05-01 中国科学院大连化学物理研究所 A kind of general-purpose vertical activates furnace system
CN108277337A (en) * 2018-02-27 2018-07-13 首钢京唐钢铁联合有限责任公司 A kind of vertical continuous annealing furnace control method
CN108977649B (en) * 2018-08-01 2020-06-26 首钢智新迁安电磁材料有限公司 Environment-friendly control method of natural gas annealing furnace
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