CN112695193B - Coordination control method for ensuring efficient operation of hot rolling heating furnace burner - Google Patents
Coordination control method for ensuring efficient operation of hot rolling heating furnace burner Download PDFInfo
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- CN112695193B CN112695193B CN202011494082.1A CN202011494082A CN112695193B CN 112695193 B CN112695193 B CN 112695193B CN 202011494082 A CN202011494082 A CN 202011494082A CN 112695193 B CN112695193 B CN 112695193B
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/52—Methods of heating with flames
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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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Abstract
The invention relates to a coordination control method for ensuring high-efficiency work of a hot rolling heating furnace burner, which comprises the following steps: the output value scale of the furnace temperature PID regulator is converted into the gas flow rate to be used as the set value of the gas flow rate PID regulator, and meanwhile, the actual gas flow rate multiplied by the air-fuel ratio is used as the set value of the air flow rate PID regulator, so that the cascade regulation of the gas flow rate and the proportion regulation of the air flow rate are realized; setting the maximum value F of the regulation range of a PID regulator for the gas flowMaxMinimum value F of set valueminAnd when the flow process value is less than the minimum value FminThen, change it to the minimum value Fmin(ii) a Converting the output value scale of the furnace temperature PID regulator into a duty ratio rho and then using the duty ratio rho as a set value of a burner timing controller; establishing a burner timing controller; and the burner time sequence controller outputs time sequence signals to control the air pulse valve and the coal gas pulse valve and adjust the combustion time of each burner. By adopting the method, each burner can be ensured to be in the optimal combustion state, and the working efficiency of the burner is improved.
Description
Technical Field
The invention relates to the field of automatic control of hot rolling heating furnaces, in particular to a coordination control method for ensuring efficient work of a burner of a hot rolling heating furnace.
Background
The hot rolling process of the steel plant needs to uniformly heat a steel billet to a required rolling temperature firstly, a rolling mill can normally roll the steel billet, a hot rolling heating furnace is a device for heating the steel billet, the conventional heating furnace consists of one or more heating sections and a soaking section, each heating section is generally provided with a plurality of heating areas (such as a heating upper left area, a heating lower left area, a heating upper right area and a heating lower right area), the furnace wall of each heating area is provided with a plurality of burners (such as 6 burners), gas and combustion-supporting air enter the furnace to be mixed and then combusted, each heating area is provided with a set of conventional furnace temperature adjusting system, and the flow of the gas is controlled by the gas adjusting valve and the air adjusting valve according to the furnace temperature, the gas flow and the air flow detection value; the length direction of a steel billet in the heating furnace is consistent with the length direction of the flame of the burner, the burner has certain working characteristics, the flame length of each burner can be ensured only under the condition of certain coal air flow, and the heating efficiency of the burner is ensured; the temperature range of the billet to be heated is generally about normal temperature to 800 ℃, so the billet to be heated is hot fed or cold loaded, the rolling rhythm of a rolling mill can also change due to various reasons, the rolling rhythm can be changed, the factors can cause large fluctuation of the heat supply quantity in the furnace, the heating intensity (gas flow quantity) of each heating zone of the heating furnace is greatly changed in order to ensure the furnace temperature, if the gas flow quantity is too small, the flame of each burner can be caused to be too short, the heating efficiency of the burner is greatly reduced, the heating uniformity of the billet in the length direction is influenced, and energy is wasted, so the electromagnetic valve is added in front of each air gas burner of some heating zones of the heating furnace at present, the working number and the burning time of the burner (called pulse burner) can be controlled, when the burning intensity is lower, the working efficiency of the burner is improved by manually closing the burners, but the working condition change is larger, the corresponding relation between the combustion intensity and the number of the burners cannot be ensured manually in real time, so that the actual effect is not ideal.
Disclosure of Invention
The invention aims to provide a coordination control method for ensuring the efficient work of a hot rolling heating furnace burner so as to solve the problems. Therefore, the invention adopts the following specific technical scheme:
a coordination control method for ensuring the efficient work of a hot rolling heating furnace burner comprises the following steps:
the output value scale of the furnace temperature PID regulator is converted into the gas flow rate to be used as the set value of the gas flow rate PID regulator, and meanwhile, the actual gas flow rate multiplied by the air-fuel ratio is used as the set value of the air flow rate PID regulator, so that the cascade regulation of the gas flow rate and the proportion regulation of the air flow rate are realized;
in the gas flow PID regulator, the maximum value of the regulation range of the gas flow PID regulator is set as FMax＝k×n×FRatedWherein k is an adjustment coefficient, n is the number of burners, FRatedThe rated gas flow of each burner is calculated, and the minimum value F of the set value of the gas flow PID regulator is calculatedminSetting the flow process value of the PID regulator as the minimum value of the normal working load flow of the single burner, and processing the flow process value of the gas flow PID regulator when the flow process value is smaller than the minimum value FminWhile, the flow process value is modified to a minimum value Fmin；
Converting the output value scale of the furnace temperature PID regulator into a duty ratio rho and then using the duty ratio rho as a set value of a burner timing controller;
the method for establishing the burner timing controller specifically comprises the following steps:
setting a burner pulse combustion period: t is n × δ T, where δ T is the combustion period phase difference of each burner, and the unit is second;
calculating the combustion time of each burner as follows: t ═ ρ × T, where T ≦ T;
and the burner time sequence controller outputs time sequence signals to control the air pulse valve and the gas pulse valve and adjust the working period and the combustion time of each burner.
Further, Fmin＝0.4FRated～0.8FRated。
Further, k is 0.5 to 1.5.
By adopting the technical scheme, the invention has the beneficial effects that: by adopting the method, each burner can be ensured to be in the optimal combustion state, and the working efficiency of the burner is improved.
Drawings
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
FIG. 1 is a control schematic diagram of a coordinated control method for ensuring efficient operation of a hot rolling heating furnace burner of the present invention;
FIG. 2 is a flow chart of a coordinated control method for ensuring efficient operation of a hot rolling furnace burner of the present invention;
FIG. 3 is a timing diagram of combustion for 6 burners.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and detailed description.
FIG. 1 shows a coordinated control system of conventional PID control of furnace temperature and duty ratio control of burner, wherein the conventional furnace temperature control is composed of a PID regulator of furnace temperature, a PID regulator of gas flow rate and a PID regulator of air flow rate, the output value (percentage) of the PID regulator of furnace temperature is converted into gas flow rate which is used as the setting value of the PID regulator of gas flow rate, and the control of furnace temperature is realized by regulating gas flow rate; and (3) converting the output value (percentage) of the furnace temperature PID regulator into a burner combustion duty ratio, wherein the meaning of the burner combustion duty ratio is the burner combustion time proportion in unit time of each burner (for example, the number n of the burners is 6, the period T of the burners is 6 multiplied by 10s which is 60s), if the output of the duty ratio is 50%, the combustion time of each burner in one combustion period T is 30s, and if the period starting working time phase of each burner is specified to be an interval T/n, the reasonable matching of the gas flow and the working number of the burners can be realized.
Specifically, as shown in fig. 2, a coordinated control method for ensuring efficient operation of burners for a heating furnace may include the following steps:
s1: the output value of the furnace temperature PID regulator is output according to percentage (0-100%), the output value is subjected to scale conversion to be the gas flow (such as 0-6000 Nm3/h) and used as the set value of the gas flow PID regulator, the actual gas flow multiplied by the air-fuel ratio is used as the set value of the air flow PID regulator, cascade regulation of the gas flow and proportion regulation of the air flow are realized, and further the conventional regulation of the furnace temperature is realized;
s2: converting the output value scale of the furnace temperature PID regulator into a duty ratio rho (such as 0-100%) as a set value of a burner timing controller;
s3: the method for establishing the burner timing controller specifically comprises the following steps:
1) setting the number of the burners as n, wherein the pulse combustion period is as follows: t is n × δ T, where δ T is the combustion period phase difference of each burner, and the unit is second; in fig. 3, n is 6, δ T is 10s, and T is 60 s;
2) calculating the combustion time of each burner as follows: t ═ ρ × T, where T ≦ T, in fig. 3, ρ ═ 50%, T ═ 30 s;
s4: the air pulse valve and the gas pulse valve are controlled through a time sequence signal (shown in figure 3), and the working period and the burning time of each burner are adjusted, so that the burners can work efficiently. That is, each burner operates (burns) according to the timing signal output from the burner timing controller.
If the output value of the temperature PID regulator is 50%, the gas flow range is 0-6000 Nm3/h, and the rated gas flow F of each burnerRatedAnd the current gas flow control value is 3000Nm3/h when the gas flow control value is 1000Nm3/h, as can be seen from FIG. 3, the periodic combustion time of each burner is 30s, the combustion number of the burners at any time is 3, the average gas flow of each burner is 1000Nm3/h, and each burner can be in the optimal combustion state. The same control effect can be obtained at other outputs as well.
However, a critical problem is that the maximum value of the control range F of the gas flow isMaxThe rated total flow rate of the gas of the burners in the area is controlled to be n multiplied by FRatedLeft and right, or maximum value of duty cycle should be:
if ρMaxMore than or equal to 100%, then the burning time T of every nozzle is T, has guaranteed the reasonable corresponding relation of nozzle burning time and gas flow, and then has realized the corresponding relation of nozzle quantity and total gas flow, has guaranteed the efficiency that the nozzle burnt, improves the homogeneity of billet length direction heating, effective energy can be saved.
It should be noted that when the total gas flow is less than 50% x FRatedIn the meantime, although only one burner is burning at most, the burning efficiency is low, and the duty ratio is low
The burner is in a full-closed state in a part of time, the gas flow is reduced to 0, and the following measures are taken to ensure the normal operation of the furnace temperature PID regulator:
1) the minimum value F of the set value of the gas flow PID regulatorminSetting the value as the minimum value of the normal working load flow of a single burner, wherein Fmin＝0.4FRated～0.8FRatedPreferably, Fmin＝0.5FRated；
2) With gas flow PID regulatorProcessing the flow process value (actual gas flow) when the flow process value is less than the minimum value FminWhile, the flow process value is modified to a minimum value FminTherefore, the stability of the gas flow PID regulator can be ensured.
In the present invention, if FMax＝n×FRatedCan ensure that each burner is at 0.5FRated～FRatedWorking within the range, it is of course also possible to set an adjustment factor k (F)Max＝k×n×FRated) To adjust the working range of each burner to k multiplied by 0.5FRated～k×FRatedWherein k is 0.5-1.5, for example, when k is 1.3, the working range of the burner is 0.65FRated～1.3FRatedAnd the load flow working range of the burner can be met.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A coordination control method for ensuring the efficient work of a hot rolling heating furnace burner is characterized by comprising the following steps:
the output value scale of the furnace temperature PID regulator is converted into the gas flow rate which is then used as the set value of the gas flow rate PID regulator, and meanwhile, the actual gas flow rate multiplied by the air-fuel ratio is used as the set value of the air flow rate PID regulator, so that the cascade regulation of the gas flow rate and the proportion regulation of the air flow rate are realized;
in the gas flow PID regulator, the maximum value of the regulation range of the gas flow PID regulator is set as FMax＝k×n×FRatedWherein k is an adjustment coefficient, n is the number of burners, FRatedThe rated gas flow of each burner is calculated, and the minimum value F of the set value of the gas flow PID regulator is calculatedminSetting the flow process value of the PID regulator as the minimum value of the normal working load flow of the single burner, and processing the flow process value of the gas flow PID regulator when the flow process value is less than the maximum valueSmall value of FminWhile, the flow process value is modified to a minimum value Fmin；
Converting the output value scale of the furnace temperature PID regulator into a duty ratio rho and using the duty ratio rho as a set value of a burner timing controller;
the method comprises the following steps of establishing a burner timing controller and generating timing signals, and specifically comprises the following steps:
setting a pulse combustion period of the burner: t is n × δ T, where δ T is the combustion period phase difference of each burner, and the unit is second;
calculating the combustion time of each burner as follows: t is rho multiplied by T, wherein T is less than or equal to T;
and the burner time sequence controller outputs time sequence signals to control the air pulse valve and the gas pulse valve and adjust the working period and the combustion time of each burner.
2. The method of claim 1, wherein F ismin＝0.4FRated～0.8FRated。
3. The method of claim 1, wherein k is 0.5 to 1.5.
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| CN102455135B (en) * | 2010-10-27 | 2013-11-20 | 宝山钢铁股份有限公司 | Furnace temperature control method and control equipment for open fire heating furnace |
| CN108800968A (en) * | 2017-04-28 | 2018-11-13 | 宝山钢铁股份有限公司 | A kind of hot rolling pulse heating furnace method for controlling combustion |
| CN111811257B (en) * | 2020-06-16 | 2021-12-21 | 首钢京唐钢铁联合有限责任公司 | Heating furnace combustion control method and device |
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