CN109457105A - A kind of temprature control method based on steel rolling Two-cuff Technique heating furnace - Google Patents
A kind of temprature control method based on steel rolling Two-cuff Technique heating furnace Download PDFInfo
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- CN109457105A CN109457105A CN201811257632.0A CN201811257632A CN109457105A CN 109457105 A CN109457105 A CN 109457105A CN 201811257632 A CN201811257632 A CN 201811257632A CN 109457105 A CN109457105 A CN 109457105A
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- temperature
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- heating furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D11/00—Process control or regulation for heat treatments
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- Thermal Sciences (AREA)
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- Control Of Heat Treatment Processes (AREA)
Abstract
The present invention relates to a kind of temprature control methods based on steel rolling Two-cuff Technique heating furnace, including in the furnace side of steel rolling Two-cuff Technique heating furnace and furnace roof arrangement thermocouple temperature measurement point and reading in the temperature measured in PLC.Regulating valve and flowmeter is respectively set on gas piping and air pipeline, the temperature averages PV and average heating speed PV ' of a steel rolling Two-cuff Technique heating furnace were calculated every two minutes, the aperture of gas valve is denoted as one grade by every five degree further according to the size of the practical control temperature difference, is divided into 20 gears.It is adjusted by air flow rate adjustment valve to keep reasonable air-fuel ratio, finally accurately controls the furnace temperature of steel rolling Two-cuff Technique heating furnace by opening or closing burner again.The present invention realize with program adjusting be main alternative valve door adjust based on control mode, in the case where not increasing equipment and additional energy source consumes, furnace temperature can be accurately controlled, reduce temperature lag and improves heating steel billet quality, the loss of the spare parts such as valve is reduced, enterprise's production cost is saved.
Description
Technical field
The present invention relates to steel rolling Two-cuff Technique gas-fired heater technical fields, more specifically refer to a kind of based on the double storages of steel rolling
The temprature control method of hot heating furnace.
Background technique
The most important thing of steel rolling Two-cuff Technique Heating Furnace Control is the temperature control of heating furnace.Traditional steel rolling Two-cuff Technique adds
The control of hot stove temperature is using conventional PID regulative mode.Which substantially can be realized the control to furnace temp,
But since temperature control is the very big system of thermal inertia, it will appear very big temperature fluctuation in adjustment process.For a long time with
Carry out engineers and technicians generally by the mode for increasing coal gas and air control valve strength of adjustment to improve temperature control precision.
But the strength of adjustment of increasing coal gas and air control valve reduces the service life of regulating valve, increases the maintenance power to equipment
Degree, spends human and material resources.
Authorization Notice No. is that the Chinese invention patent of CN 104807036B discloses a kind of temperature of continuous gas heating furnace
Spend control method.This method propose a kind of temperature control systems for being different from traditional PI D, i.e., by comparing every some cycles
The setting value and actual value of fire box temperature judge whether to need to increase gas flow or reduce gas flow to reach control
The purpose of furnace temperature.This method has certain novelty, but since temperature controlled hysteresis quality and temperature detecting element are pacified
The reasons such as the difference of holding position are easy to be difficult to be suitable for heating because the temprature control method is using fixed adjusting logic
Any operating condition of furnace.
Authorization Notice No. is that the Chinese invention patent of CN 101929736B discloses a kind of heating based on heat-accumulating burner
Furnace temperature control method.I.e. when air mass flow and gas flow are greater than equalization point, is controlled in a manner of continuous control by simulating, work as sky
When throughput and gas flow are less than equalization point, stop simulation continuous control, the part burner in each burner of stove is carried out
Burning, stop control.First by 30 DEG C below furnace temperature coarse adjustment to set temperature, then investment simulates continuous control mode to setting again
Temperature direction heating, gas flow start to increase according to PID adjusting, until set temperature, finally enter the stabilization of feedback control
State.Simulation continuous control and burner pulse control are only combined together by the control process of this method, and are controlled temperature
Precision does not require.Especially in complex working condition and special steel grade, which not can guarantee temperature control and needs
It asks.Therefore, we provide a kind of temprature control method based on steel rolling Two-cuff Technique heating furnace.
Summary of the invention
The present invention provides a kind of temprature control methods based on steel rolling Two-cuff Technique heating furnace, to solve how not increase
In the case that equipment and additional energy source consume, accurate Control for Kiln Temperature is realized, reduce temperature lag and improve heating steel billet quality etc.
Problem.
The present invention adopts the following technical scheme:
A kind of temprature control method based on steel rolling Two-cuff Technique heating furnace, which comprises the following steps:
(1) thermocouple temperature measurement point, and each thermocouple temperature measurement that will be measured are arranged in the furnace side of steel rolling Two-cuff Technique heating furnace and furnace roof
The temperature of point is read in PLC system；
(2) gas flow regulating valve and gas flow meter are set on gas piping respectively, to measure gas flow F1 and coal
Air valve aperture A1；And air flow rate adjustment valve and air flow meter are set on air pipeline, to measure air mass flow
F2 and air door aperture A2；
(3) the temperature averages PV and average heating speed PV ' of a steel rolling Two-cuff Technique heating furnace are calculated within every two minutes；
(4) the desired temperature SP and air-fuel ratio setting value KP of steel rolling Two-cuff Technique heating furnace are first set, then practical control temperature difference S
The aperture of gas valve can be denoted as one grade by every five degree further according to the magnitude range of Δ S, be divided into 20 gears by=SP-PV；
(5) air mass flow setting value SF2=gas flow F1 × air-fuel ratio can be obtained by gas flow F1 and air-fuel ratio setting value KP
Setting value KP adjusts air flow rate adjustment valve by air mass flow PID regulative mode followability, to guarantee reasonable air-fuel ratio；
(6) according to the size of practical control temperature difference S by gas flow valve regulated to corresponding gear, so that practical control
Temperature difference S is maintained within ± 25 DEG C, then accurately controls the furnace of steel rolling Two-cuff Technique heating furnace by opening or closing burner
Temperature.
Further, the temperature averages PV=(T1+T2+T3+T4)/4, wherein T1 and T2 is respectively and rolls at a certain moment
Temperature measured by two furnace side thermocouple temperature measurement points of steel Two-cuff Technique heating furnace, T3 and T4, which are respectively that synchronization steel rolling is double, to be stored
Temperature measured by two furnace roof thermocouple temperature measurement points of hot heating furnace, the average heating speed PV '=Δ PV/ Δ t.
Further, the steel rolling Two-cuff Technique heating furnace includes four groups of burners, and four groups of burners are followed successively by burner A1/
B1, A2/B2, A3/B3 and A4/B4, burner A1 and burner B1 are symmetrical arranged, and burner A2 and burner B2 are symmetrical arranged, burner A3 and
Burner B3 is symmetrical arranged, and burner A4 and burner B4 are symmetrical arranged.
Further, as desired temperature SP > temperature averages PV, burner A1/B1, A2/B2, A3/B3 are successively closed
And A4/B4.
Further, as desired temperature SP < temperature averages PV, burner A1/B1, A2/B2, A3/B3 are successively opened
And A4/B4.
By the above-mentioned description of this invention it is found that compared to the prior art, the present invention has the advantage that
1, the present invention innovatively proposes a kind of temprature control method based on Two-cuff Technique heating furnace, which will
Air, gas flow PID control and pulse control combine.Under the premise of not increasing equipment loss and additional energy, according to
Continuous gas furnace temp variation tendency takes different schemes to carry out temperature control.The present invention can accurately control furnace temperature,
Reduce temperature and control hysteresis quality, by furnace temperature precision controlling at ± 5 DEG C.Since Control for Kiln Temperature precision is higher, blank can be improved
Heating quality.
2, the present invention realize with program adjusting be main alternative valve door adjust based on control mode.Due to reducing valve
Adjusting, not only reduce the loss of the spare parts such as valve to increasing its service life, but also can be reduced the consuming of manpower and material resources, finally
Save the production cost of enterprise.
3, the present invention has a wide range of application, and temperature control system is stable, can preferably adapt to complicated industrial environment.
Detailed description of the invention
Fig. 1 is that the burner of steel rolling Two-cuff Technique heating furnace distributes schematic diagram.
Specific embodiment
A kind of temprature control method based on steel rolling Two-cuff Technique heating furnace, referring to Fig.1, comprising the following steps:
(1) thermocouple temperature measurement point is arranged in the furnace side of steel rolling Two-cuff Technique heating furnace and furnace roof, and each thermocouple temperature measurement point is measured
Temperature read in PLC system in.
(2) gas flow regulating valve and gas flow meter are set on gas piping respectively, to measure gas flow F1
With gas valve aperture A1；And air flow rate adjustment valve and air flow meter are set on air pipeline, to measure air
Flow F2 and air door aperture A2.
(3) the temperature averages PV and average heating speed PV ' of a steel rolling Two-cuff Technique heating furnace were calculated every two minutes.
Temperature averages PV=(T1+T2+T3+T4)/4, wherein T1 and T2 is respectively two furnaces of a certain moment steel rolling Two-cuff Technique heating furnace
Temperature measured by the thermocouple temperature measurement point of side, T3 and T4 are respectively two furnace roof thermoelectricity of synchronization steel rolling Two-cuff Technique heating furnace
Temperature measured by even temperature measuring point.Average heating speed PV '=Δ PV/ Δ t.
(4) the desired temperature SP and air-fuel ratio setting value KP of steel rolling Two-cuff Technique heating furnace are first set, then practical control temperature
Poor Δ S=SP-PV.The aperture of gas valve is denoted as one grade by every five degree further according to the size of Δ S, is divided into 20 gears.
(5) air mass flow setting value SF2=F1 × KP can be calculated by gas flow F1 and air-fuel ratio setting value KP, then led to
It crosses air mass flow PID regulative mode followability and adjusts air flow rate adjustment valve to control actual air mass flow F2, keep steel rolling double
Thermal storage heating stove is able to maintain reasonable air-fuel ratio.
(6) gas valve is adjusted onto corresponding gear according to the size of practical control temperature difference S, makes practical control temperature
Poor Δ S is maintained within ± 25 DEG C.Then the furnace temperature of steel rolling Two-cuff Technique heating furnace is accurately controlled by opening or closing burner.
Steel rolling Two-cuff Technique heating furnace includes four groups of burners, and four groups of burners are followed successively by burner A1/B1, A2/B2, A3/B3 and A4/B4.Burner
A1 and burner B1 is symmetrical arranged, and burner A2 and burner B2 are symmetrical arranged, and burner A3 and burner B3 are symmetrical arranged, burner A4 and burner
B4 is symmetrical arranged.As desired temperature SP > temperature averages PV, burner A1/B1, A2/B2, A3/B3 and A4/ are successively closed
B4.As desired temperature SP < temperature averages PV, burner A1/B1, A2/B2, A3/B3 and A4/B4 are successively opened.
The aperture of gas valve is divided into several gears according to the size of Δ S, wherein often opening 5 degree is denoted as one grade, is divided into
For 20 gears.As shown in Table 1, wherein zero indicates to keep current gear, and -1 indicates to subtract 1 grade in current gear, and+1 indicates to exist
Current gear adds 1 grade, and so on.
Table one: gas valve gear judgement
The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited to this, all to utilize this design
It makes a non-material change to the present invention, should all belong to behavior that violates the scope of protection of the present invention.
Claims (5)
1. a kind of temprature control method based on steel rolling Two-cuff Technique heating furnace, which comprises the following steps:
(1) thermocouple temperature measurement point, and each thermocouple temperature measurement that will be measured are arranged in the furnace side of steel rolling Two-cuff Technique heating furnace and furnace roof
The temperature of point is read in PLC system；
(2) gas flow regulating valve and gas flow meter are set on gas piping respectively, to measure gas flow F1 and coal
Air valve aperture A1；And air flow rate adjustment valve and air flow meter are set on air pipeline, to measure air mass flow
F2 and air door aperture A2；
(3) the temperature averages PV and average heating speed PV ' of a steel rolling Two-cuff Technique heating furnace are calculated within every two minutes；
(4) the desired temperature SP and air-fuel ratio setting value KP of steel rolling Two-cuff Technique heating furnace, then it is practical to control temperature difference S=SP-
The aperture of gas valve can be denoted as one grade by every five degree according to the magnitude range of Δ S, be divided into 20 gears by PV；
(5) air mass flow setting value SF2=gas flow F1 × air-fuel ratio can be obtained by gas flow F1 and air-fuel ratio setting value KP
Setting value KP adjusts air flow rate adjustment valve by air mass flow PID regulative mode followability, to guarantee reasonable air-fuel ratio；
(6) according to the size of practical control temperature difference S by gas flow valve regulated to corresponding gear, so that practical control
Temperature difference S is maintained within ± 25 DEG C, then accurately controls the furnace of steel rolling Two-cuff Technique heating furnace by opening or closing burner
Temperature.
2. a kind of temprature control method based on steel rolling Two-cuff Technique heating furnace as described in claim 1, it is characterised in that: described
Temperature averages PV=(T1+T2+T3+T4)/4, wherein T1 and T2 is respectively two furnaces of a certain moment steel rolling Two-cuff Technique heating furnace
Temperature measured by the thermocouple temperature measurement point of side, T3 and T4 are respectively two furnace roof thermoelectricity of synchronization steel rolling Two-cuff Technique heating furnace
Temperature measured by even temperature measuring point, the average heating speed PV '=Δ PV/ Δ t.
3. a kind of temprature control method based on steel rolling Two-cuff Technique heating furnace as described in claim 1, it is characterised in that: described
Steel rolling Two-cuff Technique heating furnace includes four groups of burners, and four groups of burners are followed successively by burner A1/B1, A2/B2, A3/B3 and A4/B4,
Burner A1 and burner B1 is symmetrical arranged, and burner A2 and burner B2 are symmetrical arranged, and burner A3 and burner B3 are symmetrical arranged, burner A4 and
Burner B4 is symmetrical arranged.
4. a kind of temprature control method based on steel rolling Two-cuff Technique heating furnace as claimed in claim 3, it is characterised in that: work as temperature
When spending setting value SP > temperature averages PV, burner A1/B1, A2/B2, A3/B3 and A4/B4 are successively closed.
5. a kind of temprature control method based on steel rolling Two-cuff Technique heating furnace as claimed in claim 3, it is characterised in that: work as temperature
When spending setting value SP < temperature averages PV, burner A1/B1, A2/B2, A3/B3 and A4/B4 are successively opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811257632.0A CN109457105A (en) | 2018-10-26 | 2018-10-26 | A kind of temprature control method based on steel rolling Two-cuff Technique heating furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811257632.0A CN109457105A (en) | 2018-10-26 | 2018-10-26 | A kind of temprature control method based on steel rolling Two-cuff Technique heating furnace |
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| CN109457105A true CN109457105A (en) | 2019-03-12 |
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| CN201811257632.0A Pending CN109457105A (en) | 2018-10-26 | 2018-10-26 | A kind of temprature control method based on steel rolling Two-cuff Technique heating furnace |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854459A (en) * | 2020-08-05 | 2020-10-30 | 广西柳州钢铁集团有限公司 | Accurate control method for furnace gas temperature of heating furnace |
| CN112033138A (en) * | 2020-08-25 | 2020-12-04 | 浙江石油化工有限公司 | Double-hearth tubular heating furnace drying furnace |
| CN112524968A (en) * | 2020-11-30 | 2021-03-19 | 盐城市联鑫钢铁有限公司 | Energy-saving heating furnace combustion control method |
| CN114485201A (en) * | 2022-03-01 | 2022-05-13 | 重庆燃控科技有限公司 | Double-heat-storage intelligent diagnosis combustion system and diagnosis method |
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| WO2006095960A1 (en) * | 2005-01-28 | 2006-09-14 | Kyungdong Network Co., Ltd. | System and control method of oil burner's suitable burning ratio using air pressure sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854459A (en) * | 2020-08-05 | 2020-10-30 | 广西柳州钢铁集团有限公司 | Accurate control method for furnace gas temperature of heating furnace |
| CN111854459B (en) * | 2020-08-05 | 2021-07-02 | 广西柳州钢铁集团有限公司 | Accurate control method for furnace gas temperature of heating furnace |
| CN112033138A (en) * | 2020-08-25 | 2020-12-04 | 浙江石油化工有限公司 | Double-hearth tubular heating furnace drying furnace |
| CN112524968A (en) * | 2020-11-30 | 2021-03-19 | 盐城市联鑫钢铁有限公司 | Energy-saving heating furnace combustion control method |
| CN114485201A (en) * | 2022-03-01 | 2022-05-13 | 重庆燃控科技有限公司 | Double-heat-storage intelligent diagnosis combustion system and diagnosis method |
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Application publication date: 20190312 |