CN206891162U - A kind of recuperative heater optimum combustion control system - Google Patents
A kind of recuperative heater optimum combustion control system Download PDFInfo
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- CN206891162U CN206891162U CN201621423877.2U CN201621423877U CN206891162U CN 206891162 U CN206891162 U CN 206891162U CN 201621423877 U CN201621423877 U CN 201621423877U CN 206891162 U CN206891162 U CN 206891162U
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Abstract
A kind of recuperative heater optimum combustion control system, including heating furnace, PLC control system, sensor and regulating valve；The sensor includes air branch pipe flow sensor, branch gas tube flow sensor, oxygen analyser, furnace temperature sensor, steel billet temperature sensor and furnace pressure sensor；The regulating valve includes air branch pipe regulating valve, branch gas tube regulating valve；Residual oxygen content tandem closed-loop control system and furnace temperature the tandem double closed-loop control system being made up of them collectively constitutes recuperative heater optimum combustion control system.The system realizes automatically controlling for furnace atmosphere and furnace temperature using relatively low cost, can also keep system stable when calorific value of gas and pressure oscillation, can effectively control reduces oxidization burning loss and skin decarburization.
Description
Technical field
Heater control system is the utility model is related to, more particularly to a kind of recuperative heater optimum combustion control system
System.
Background technology
Recuperative heater is divided into 3 sections：Preheating section, bringing-up section and soaking zone, each section of furnace atmosphere require different.
In preheating section, steel billet temperature is less than 800 DEG C, and the iron scale of generation is less, and the furnace atmosphere of this section can be micro-oxidizing atmosphere.
And improved in bringing-up section, steel billet temperature to 1000 DEG C rapidly, the steel billet temperature for reaching soaking zone is even more to reach more than 1100 DEG C, steel
Base is at this temperature, it is necessary to is reducing atmosphere in holding furnace, otherwise can produce substantial amounts of iron scale.As can be seen here, rationally control
Furnace atmosphere processed is very important.Fixed air-fuel ratio, that is, keep the ratio of gas flow and air mass flow constant, it is clear that no
It can guarantee that optimal fired state and optimal furnace atmosphere.It is desirable that billet surface oxidation can effectively be reduced by finding one kind
Scaling loss and the method for controlling combustion of skin decarburization, it can guarantee that in the case that gas pressure and calorific value of gas fluctuation are larger optimal
Fired state and optimal furnace atmosphere.
Steel billet burning time and burnt temperature, refer to steel billet in each stove section unnecessary heat time and too high heating temperature
Degree.Control furnace temperature can reduce burning time and burnt temperature of the steel billet in each stove section to greatest extent, and realization meets work
Oxidization burning loss skin decarburization is reduced on the premise of skill target.Therefore, it is accurate and reasonably to control furnace temperature be also recuperative heater
The important step of combustion control system.
Publication No.：CN104633698A Chinese invention patent propose " a kind of residual oxygen content of recuperative heater from
Autocontrol system and its method " patent describes a kind of autocontrol method of residual oxygen content in heating furnace burner hearth, using calorific value
Analyzer measures gas composition to calculate theoretical air-fuel ratio and Zirconium oxide analyzer to realize to the automatic of actual use air-fuel ratio
The measurement result of caloric value instrument is participated in calculating in real time by amendment, this method.
Publication No.：" method for controlling combustion in heating furnace " that CN103062790A Chinese invention patent proposes is using sharp
Light spectral analysis technique measures the oxygen content of each burning zone in heating furnace, then calculates the superfluous system of actual air according to oxygen content
Number, carrys out theoretical air-fuel ratio, so as to adjust coal gas and air door further according to the deviation of actual air coefficient and theoretical air coefficient.
The caloric value instrument that the above method refers to is expensive, can influence the popularization and application of this method.Above two method is all adopted
The amendment of air-fuel ratio is carried out with complicated algorithm, is difficult that holding system is stable in calorific value of gas and pressure oscillation.
The content of the invention
In order to solve problem described in background technology, the utility model provides a kind of recuperative heater best combustion control
System processed, using feedback closed loop control mode, for the purpose of finally realizing remaining oxygen and furnace temperature reaches requirement, with relatively low cost
Automatically controlling for furnace atmosphere and furnace temperature is realized, can also keep system stable when calorific value of gas and pressure oscillation, can
Effective control reduces oxidization burning loss and skin decarburization.
In order to achieve the above object, the utility model is realized using following technical scheme：
A kind of recuperative heater optimum combustion control system, including heating furnace, PLC control system, sensor and regulation
Valve；The sensor includes air branch pipe flow sensor, branch gas tube flow sensor, oxygen analyser, furnace temperature sensing
Device, steel billet temperature sensor and furnace pressure sensor；The regulating valve includes air branch pipe regulating valve, branch gas tube is adjusted
Valve；
It is connected by the PLC control system with air branch pipe flow sensor, air branch pipe regulating valve and forms air branch
Pipe flow closed-loop control system；By PLC control system, oxygen analyser, air branch pipe flow closed-loop control system form with
Residual oxygen content is the major loop of target and the residual oxygen content tandem closed-loop control system using air flow control as subloop；
It is connected by the PLC control system with branch gas tube flow sensor, branch gas tube regulating valve and forms coal gas branch
Pipe flow closed-loop control system；By PLC control system and furnace temperature sensor, steel billet temperature sensor, branch gas tube flow closed loop
Control system is connected furnace temperature tandem closed loop of the composition using furnace temperature as the major loop of target and using gas flow control as subloop
Control system, and form furnace temperature string by the use of steel billet temperature as the corrected Calculation parameter of furnace temperature setting value in Control for Kiln Temperature
Level double closed-loop control system；
By the residual oxygen content tandem closed-loop control system and the furnace temperature tandem double closed-loop control system to each heating
Duan Jinhang is independently controlled, and collectively constitutes recuperative heater optimum combustion control system.
The PLC system is made up of S7300PLC controllers, KTP1000 touch-screens and industrial computer.
The air branch pipe flow sensor and air branch pipe regulating valve are respectively arranged on the air branch of three bringing-up sections
At pipe, the branch gas tube flow sensor and branch gas tube regulating valve are respectively arranged on the branch gas tube of three bringing-up sections
Place.
The oxygen analyser is Zirconium oxide analyzer, and quantity is 2, is separately positioned on the air off gas branch of soaking zone
At pipe and at coal gas waste gas branch pipe.
The furnace temperature sensor is respectively by three bringing-up sections in furnace roof exterior wall insertion burner hearth.
The steel billet temperature sensor is infrared pyrometer, is located after furnace outlet dephosphorization.
The furnace pressure sensor is separately positioned on burner hearth porch and exit.
Compared with prior art, the utility model beneficial effect is：
1st, in heating furnace production process, the strict furnace atmosphere state for controlling each stove section of heating furnace, soaking is ensured first
The furnace gas atmosphere of section is reducing condition, and when steel billet is in the condition of high temperature, bringing-up section will also be in reducing atmosphere, so as to
Reduce the chance of generation iron scale.
2nd, steel billet burning time and burnt temperature are reduced to greatest extent.System calculates whether steel billet has reached this in real time
The target temperature of section, and one of basic condition that burning time and burnt temperature are set as optimum furnace, pass through change
Furnace temperature, burning time and burnt temperature of the steel billet in each stove section is reduced to greatest extent, before realization meets process goal
Putting reduces oxidization burning loss skin decarburization.
3rd, caloric value instrument is not used, flue gas oxygen content is measured only with zirconium oxide oxygen analyzer, without the calculation of complexity
Method, using feedback closed loop control mode, finally realize that remaining oxygen and furnace temperature reach the purpose of requirement, have the following advantages：First, with
Relatively low cost realizes automatically controlling for furnace atmosphere and furnace temperature；Second, it can also be protected when calorific value of gas and pressure oscillation
It is stable to hold system.
Brief description of the drawings
Fig. 1 is overhaul flow chart of the present utility model；
Fig. 2 is the control block diagram of optimum combustion control method of the present utility model；
Fig. 3 is the residual oxygen content tandem closed-loop control system block diagram of optimum combustion control system of the present utility model；
Fig. 4 is optimum combustion control system furnace temperature closed-loop control system block diagram of the present utility model.
Wherein, 1- heating furnaces entrance 2- preheating sections 3- bringing-up sections 4- soaking zones 5- furnace outlet 6- triplet commutations
Valve 7- burner 8- steel billet 9- combustion fans, 10- air header flow sensor 11- air header pressure sensors 12- are empty
Gas branch pipe flow sensor 13- air branch pipe regulating valve 14- gas main flow sensor 15- gas main pressure sensings
Device 16- branch gas tube flow sensor 17- branch gas tube regulating valve 18- air off gas branch pipe regulating valve 19- coal gas waste gas
The oxygen analyser 21- smoke induced draught fan 22- furnace temperature sensor 23- furnace pressure sensor 24- steel of branch pipe regulating valve 20
Base temperature sensor.
Embodiment
Embodiment provided by the utility model is described in detail below in conjunction with accompanying drawing.
As shown in figure 1, a kind of recuperative heater optimum combustion control system, including heating furnace, PLC control system, biography
Sensor and regulating valve；The sensor includes air branch pipe flow sensor 12, branch gas tube flow sensor 16, oxygen content point
Analyzer 20, furnace temperature sensor 22, steel billet temperature sensor 24 and furnace pressure sensor 23；The regulating valve includes air branch pipe
Regulating valve 13, branch gas tube regulating valve 17；
As shown in Figure 2,3, by the PLC control system and air branch pipe flow sensor 12, air branch pipe regulating valve 13
Be connected composition air branch pipe flow closed-loop control system；Closed by PLC control system, oxygen analyser 2, air branch pipe flow
Ring control system forms the residual oxygen content tandem using residual oxygen content as the major loop of target and using air flow control as subloop
Closed-loop control system；
As shown in Figure 2,4, by the PLC control system and branch gas tube flow sensor 16, branch gas tube regulating valve 17
Be connected composition branch gas tube flow closed-loop control system；By PLC control system and furnace temperature sensor 22, steel billet temperature sensor
24th, branch gas tube flow closed-loop control system is connected composition using furnace temperature as the major loop of target and using gas flow control as pair
The furnace temperature tandem closed-loop control system in loop, and the corrected Calculation in Control for Kiln Temperature by the use of steel billet temperature as furnace temperature setting value
Parameter, form furnace temperature tandem double closed-loop control system；
By the residual oxygen content tandem closed-loop control system and the furnace temperature tandem double closed-loop control system to each heating
Duan Jinhang is independently controlled, and collectively constitutes recuperative heater optimum combustion control system.
The PLC system is made up of S7300PLC controllers, KTP1000 touch-screens and industrial computer.
The air branch pipe flow sensor 12 and air branch pipe regulating valve 13 are respectively arranged on the sky of three bringing-up sections
At gas branch pipe, the branch gas tube flow sensor 16 and branch gas tube regulating valve 17 are respectively arranged on the coal of three bringing-up sections
At gas branch pipe.
The oxygen analyser 20 is Zirconium oxide analyzer, and quantity is 2, is separately positioned on the air off gas of soaking zone
At branch pipe and at coal gas waste gas branch pipe.
The furnace temperature sensor 22 is respectively by three bringing-up sections in furnace roof exterior wall insertion burner hearth.
The steel billet temperature sensor 24 is infrared pyrometer, is located after furnace outlet dephosphorization.
The furnace pressure sensor 23 is separately positioned on burner hearth porch and exit.
Described sensor is also containing air header flow sensor 10, air header pressure sensor 11, gas main
Flow sensor 14, gas main pressure sensor 15, they are connected with PLC control system, for monitoring the fortune of heating furnace
Row state.
Described regulating valve also contains air off gas branch pipe regulating valve 18 and coal gas waste gas branch pipe regulating valve 19, air off gas
Branch pipe regulating valve 18 set respectively three bringing-up sections at air off gas branch pipe, coal gas waste gas branch pipe regulating valve 19 sets respectively
In three bringing-up sections at coal gas gas waste gas branch pipe；They are connected with PLC control system, for adjusting air off gas and coal
The velocity of discharge of gas waste gas.
The furnace temperature sensor 22 is S type thermocouples.
The furnace pressure sensor 23 is connected with PLC control system, is monitored for furnace pressure.
KTP1000 touch-screens in the PLC control system are connected with S7300PLC using ether net mode, for scene
Operate and monitor, the industrial computer in PLC control system is connected with S7300PLC using PROFIBUS-DP bus modes, for remote
Journey operates and monitoring.
The control method of the recuperative heater optimum combustion control system includes：
(1) the residual oxygen content autocontrol method of flue gas：
Step 1: an oxygen content is installed respectively on soaking zone air off gas smoke discharging pipe and coal gas waste gas smoke discharging pipe
Analyzer, measure the oxygen content O in the waste gas in heating-furnace2%, by oxygen content corrected Calculation, its value passes to air-fuel
Compare PID controller；
Further, postpone because sampling line is present, and the Sampling analysis process of analyzer needs the regular hour,
That is within a commutation cycle, after avoiding commutation transient process and time delay t, can just obtain reflecting gas in real stove
Atmosphere measurement result.Data acquisition time tsSpan be：
ts∈ [t, T] (commutation cycle of recuperative heater is T)；
Compare each measured value, take the maximum in measured value, it is R to obtain the residual oxygen content of actual flue gasmax；
Step 2: according to the technological requirements such as the steel grade and rolling specs for entering stove steel billet, the target of the setting residual oxygen content of flue gas
Reference value Rref, according to RmaxWith RrefBetween size of the difference and its rate of change, in PLC control program set PID closed loop journeys
Sequence, and the effective range of control output is set, draw required air fuel ratio value；
Step 3: the air fuel ratio value drawn by step 2 and the required Gas Flow value meter calculated by Furnace Temperature Control System
Calculate required air mass flow；After flow control subloop cross limiting range control, air door aperture is calculated, controls air adjustment
Valve, form the residual oxygen content tandem closed-loop control using residual oxygen content as the major loop of target and using air flow control as subloop
System；In this way, can not have to complicated calculation formula can adjust automatically air-fuel ratio setting value, reach and finally automatically adjust flue gas
The purpose of oxygen content；
(2) furnace temperature autocontrol method：
Step 1: three bringing-up sections in recuperative heater set furnace temperature sensor respectively, the furnace temperature data that will be measured
Pass to furnace temperature PID controller；
Step 2: furnace temperature PID controller receives setting value T_sv, compared with measured value T_pv, deviation T_ is obtained
Err, system calculate corresponding required gas flow, flow control subloop intersects according to T_err change using pid algorithm
After amplitude limit control, gas valve aperture is calculated, controls gas regulator；
Further, furnace temperature setting optimization link, installs infrared pyrometer after furnace outlet de-scaling, measures opening for steel billet
Roll temperature, pace of the system according to steel billet in stove, and furnace temperature of each section of heating furnace etc. calculate steel billet it is any in stove when
The surface temperature and core temperature at quarter, while according to the start rolling temperature of steel billet, the steel grade and rolling specs of steel billet, and influence to add
The environmental factor of thermal process, such as the steel billet speed of service, actual set furnace temperature, steel billet environment temperature (being based on furnace gas temperature detected value)
Furnace temperature setting value is modified；Finally realize that the pair using temperature control as the major loop of target and using flow control as target is returned
Temperature-flow tandem double closed-loop control system that road is formed.
The oxidization burning loss measurement result such as following table put into before recuperative heater optimum combustion control system：
The oxidization burning loss measurement result such as following table put into after recuperative heater optimum combustion control system：
After above-mentioned two table is contrasted as can be seen that putting into recuperative heater optimum combustion control system, the oxygen of steel billet
Change burn out rate to be significantly reduced.
Above example is implemented under premised on technical solutions of the utility model, gives detailed embodiment
With specific operating process, but the scope of protection of the utility model is not limited to the above embodiments.Side used in above-described embodiment
Method is conventional method unless otherwise instructed.
Claims (7)
1. a kind of recuperative heater optimum combustion control system, including heating furnace, PLC control system, sensor and regulating valve；
The sensor include air branch pipe flow sensor, branch gas tube flow sensor, oxygen analyser, furnace temperature sensor,
Steel billet temperature sensor and furnace pressure sensor；The regulating valve includes air branch pipe regulating valve, branch gas tube regulating valve；
Characterized in that, it is connected and is formed with air branch pipe flow sensor, air branch pipe regulating valve by the PLC control system
Air branch pipe flow closed-loop control system；By PLC control system, oxygen analyser, air branch pipe flow closed-loop control system
Form the residual oxygen content tandem closed-loop control system using residual oxygen content as the major loop of target and using air flow control as subloop
System；
It is connected by the PLC control system with branch gas tube flow sensor, branch gas tube regulating valve and forms branch gas tube stream
Measure closed-loop control system；By PLC control system and furnace temperature sensor, steel billet temperature sensor, branch gas tube flow closed-loop control
System is connected furnace temperature tandem closed-loop control of the composition using furnace temperature as the major loop of target and using gas flow control as subloop
System, and it is double to form furnace temperature tandem by the use of steel billet temperature as the corrected Calculation parameter of furnace temperature setting value in Control for Kiln Temperature
Closed-loop control system；
Each bringing-up section is entered by the residual oxygen content tandem closed-loop control system and the furnace temperature tandem double closed-loop control system
Row independently controls, and collectively constitutes recuperative heater optimum combustion control system.
A kind of 2. recuperative heater optimum combustion control system according to claim 1, it is characterised in that the PLC
System is made up of S7300PLC controllers, KTP1000 touch-screens and industrial computer.
A kind of 3. recuperative heater optimum combustion control system according to claim 1, it is characterised in that the air
Branch flow sensor tube and air branch pipe regulating valve are respectively arranged at the air branch pipe of three bringing-up sections, the branch gas tube
Flow sensor and branch gas tube regulating valve are respectively arranged at the branch gas tube of three bringing-up sections.
4. a kind of recuperative heater optimum combustion control system according to claim 1, it is characterised in that described oxygen-containing
Amount analyzer is Zirconium oxide analyzer, and quantity is 2, is separately positioned at the air off gas branch pipe of soaking zone and coal gas waste gas branch
At pipe.
A kind of 5. recuperative heater optimum combustion control system according to claim 1, it is characterised in that the furnace temperature
Sensor is respectively by three bringing-up sections in furnace roof exterior wall insertion burner hearth.
A kind of 6. recuperative heater optimum combustion control system according to claim 1, it is characterised in that the steel billet
Temperature sensor is infrared pyrometer, is located after furnace outlet dephosphorization.
A kind of 7. recuperative heater optimum combustion control system according to claim 1, it is characterised in that the burner hearth
Pressure sensor is separately positioned on burner hearth porch and exit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621423877.2U CN206891162U (en) | 2016-12-23 | 2016-12-23 | A kind of recuperative heater optimum combustion control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621423877.2U CN206891162U (en) | 2016-12-23 | 2016-12-23 | A kind of recuperative heater optimum combustion control system |
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| CN206891162U true CN206891162U (en) | 2018-01-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766883A (en) * | 2016-12-23 | 2017-05-31 | 鞍钢集团信息产业（大连）工程有限公司 | A kind of recuperative heater optimum combustion control system and method |
-
2016
- 2016-12-23 CN CN201621423877.2U patent/CN206891162U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766883A (en) * | 2016-12-23 | 2017-05-31 | 鞍钢集团信息产业（大连）工程有限公司 | A kind of recuperative heater optimum combustion control system and method |
| CN106766883B (en) * | 2016-12-23 | 2022-10-21 | 大连华冶联自动化有限公司 | Optimal combustion control system and method for regenerative heating furnace |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211013 Address after: 116000 No. 9, Lixian street, Qixianling, high tech Industrial Park, Dalian, Liaoning Patentee after: DALIAN HUAYELIAN AUTOMATION Co.,Ltd. Address before: 114000 Anshan City, Liaoning Province 292 South Zhonghua Road, Tiedong District, Anshan City, Liaoning Province Patentee before: ANSTEEL INFORMATION INDUSTRY (DALIAN) ENGINEERING Co.,Ltd. |
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| TR01 | Transfer of patent right |