CN-122012893-A - Steel billet porous combustion uniform temperature closed-loop control method

CN122012893ACN 122012893 ACN122012893 ACN 122012893ACN-122012893-A

Abstract

The invention relates to the technical field of thermal control and combustion regulation of an industrial furnace, and discloses a billet multi-hole combustion uniform-temperature closed-loop control method, which is used for solving the problem that effective feedback information capable of representing the temperature difference change of a billet along the length direction and the width direction is difficult to obtain on the premise of not adding a complex contact temperature measuring device in the traditional method; the method comprises the steps of firstly distinguishing bands, burner groups, temperature measurement mapping and threshold versions of a session freezing furnace, unifying time base of multi-source temperature measurement, execution amount and furnace condition data, admitting in a grading manner, constructing an observation window according to a furnace outlet event, extracting long and wide temperature differences, carrying out consistency verification by combining burners, generating limited small stepping adjustment amount according to the mapping versions, stabilizing the boundary, safety boundary, furnace pressure and temperature measurement quality gating, triggering to finish version switching or rollback and degradation recovery through a probe and rechecking, and stably converging the temperature differences.

Inventors

MIAO JIAWU
ZHANG XIMING
CHEN XIAOWEI
Lv Shuzhi

Assignees

天津市静海县金利钢铁有限公司
天津市静海县金利工贸有限公司
天津金都钢铁有限公司

Dates

Publication Date: 20260512
Application Date: 20260305

Claims (9)

1. The method for closed-loop control of porous combustion and uniform temperature of the steel billet is characterized by comprising the following steps of: s1, establishing a session, wherein a freezing furnace is distinguished into a zone rule, a burner group number, a temperature measurement point location map, a uniform temperature index caliber and a version effective boundary; S2, unifying the partition temperature measurement, the tapping temperature measurement, the combustion execution quantity and the furnace condition data with a time reference, performing admission judgment on the effectiveness of the data, and recording shielding, drifting, losing and alarming states; S3, establishing an observation window by taking a tapping event as an anchor, generating a record of temperature difference in the length direction and temperature difference in the width direction, summarizing action abstracts of burner groups in the window, and completing consistency verification; S4, determining an adjusting action according to the temperature difference state calling mapping version, issuing after boundary gating, and associating an observation window with an evidence number; and S5, inserting a probe window and entering a rechecking window when the triggering condition is met, finishing version switching or rollback and setting a forbidden period, entering a degradation flow when the triggering condition is abnormal and returning to session operation after the triggering condition is met.
2. The method for closed-loop control of multi-hole combustion and uniform temperature of a steel billet according to claim 1, wherein establishing a session, a freezing furnace distinguishing zone rule, a burner group number, a temperature measurement point location map, a uniform temperature index caliber and a version validation boundary comprises the following steps: the session number is generated by a time stamp, a furnace number and a shift number; writing a version number of the session configuration item into the session snapshot and registering an audit index; Before freezing, consistency and integrity checking are carried out, when the detection mark is in limited observation and the permission of the probe is forbidden, the conservative action is switched when the boundary is abnormal; The last version is used and the reason code is recorded when the session establishment fails.
3. The closed-loop control method for multi-hole combustion and uniform temperature of steel billets according to claim 1, wherein unifying the time reference of the partition temperature measurement, the tapping temperature measurement, the combustion execution amount and the furnace condition data comprises the following steps: the sampling frame is accessed in a rolling way according to a fixed control period and carries a session number, a caliber version number, a gating threshold version number and a threshold source identification type code; The time reference parameter is taken from a session freezing item, and the time stamps of all sources are aligned to a gateway clock; The alignment error overrun marks the time abnormality and shifts to the conservative channel, and the overtime event is recorded when the processing overtime.
4. The closed loop control method for multi-hole combustion and temperature equalization of steel billets according to claim 1, wherein the admission judgment of the validity of the data and the recording of the shielding, drifting, losing and alarming states comprise: The admission judgment adopts point position level, section level and session level gating and outputs quality labeling frames; the point position level is classified according to the effective sampling duty ratio and the coverage rate of the view field and combining the stable emissivity, drift and loss criteria; the section level generates a limited list according to the execution permission and the saturation mark; The session level triggers a degradation strategy code according to the furnace pressure fluctuation level and the alarm mapping, and registers abnormal events for sampling mutation and point location conflict.
5. The closed loop control method for multi-hole combustion and uniform temperature of steel billets according to claim 1, wherein the method for establishing an observation window by taking a tapping event as an anchor to generate a record of temperature difference in length direction and temperature difference in width direction comprises the following steps: the observation window takes the tapping time stamp as an end point and backtracks according to a frozen end key section list of the session; window validity gating refers to admission standard frames and verifies tracking and advances monotonicity; When the window is effective, representative values are extracted from the head and tail regions and the left, middle and right regions according to the freezing sampling proportion, the head and tail representative values take median values of a plurality of continuous control periods, length temperature difference and width temperature difference records are generated, and temperature difference quality grades are assigned.
6. The closed-loop control method for multi-hole combustion and uniform temperature of steel billets according to claim 1, wherein summarizing the action abstract of the burner group in the window and completing the consistency verification comprises the following steps: the action abstract is used for sorting the combustion execution change into action fragments which are not repeated in the minimum stable holding time according to the serial numbers of the burner groups, and recording action type codes, amplitude grades, saturation marks and gate control cutting marks; The consistency verification refers to a hysteresis grade table and an improvement threshold to carry out time sequence, direction and boundary judgment; and writing an invalid reason code when the verification is invalid, and associating the verification record with the window number.
7. The method for closed-loop control of multi-hole combustion and uniform temperature of a steel billet according to claim 1, wherein the steps of determining an adjustment action according to a temperature difference state calling mapping version, issuing after boundary gating, and associating an observation window with an evidence number include: the temperature difference state is formed by summarizing near-end temperature differences and carries overrun grades and trend marks; Generating a limited action candidate according to the priority and the hysteresis level of the mapping version, adopting small steps, and screening out by combining the section temperature allowance and the execution saturation; the candidate actions are cut or frozen and issued after being gated by a stable lower limit, a safe upper limit, furnace pressure, alarm and temperature measurement quality; the control output is associated with a window number, a verification number, and disable, degrade, and timeout events are registered for execution rejection, feedback loss, and timeout, respectively.
8. The closed loop control method for multi-hole combustion and temperature equalization of steel billet according to claim 1, wherein the method for inserting the probe window and entering the rechecking window when the triggering condition is satisfied comprises the following steps: The triggering item is frozen in the session and the rule number is registered, the triggering type is continuously overrun, insufficient in convergence, mode switching or evidence quality reduction, and the quantity threshold and the quality threshold are met at the same time; after the trigger is established, selecting a limited number of burner groups to execute limited small-step disturbance, setting the duration of a probe window according to the hysteresis level, generating a probe record under a stricter gating condition, and registering the probe record to an evidence index.
9. The method for closed-loop control of multi-hole combustion and uniform temperature of steel billets according to claim 1, wherein the method is characterized in that version switching or rollback is completed, a forbidden period is set, and when abnormal, a degradation flow is entered and a recovery condition is met, and then session operation is returned, and comprises the following steps: When the probe records meet the conditions of consistent time sequence, consistent direction and consistent boundary, generating a candidate mapping version only aiming at burner group entries participating in the probe in the range of adjacent lag files or adjacent priority files, executing switching or rollback at the effective boundary of the version, setting a forbidden period and prohibiting the same rule number from triggering again; When the probe or recheck fails or serious alarm occurs, the temperature measurement is lost, the execution refuses to continuously occur, the furnace pressure fluctuation level exceeds the limit level, the grade is switched into the limit degradation, and the degradation is withdrawn after the quality level is recovered, the furnace pressure level is recovered and the record is confirmed to be effective.

Description

Steel billet porous combustion uniform temperature closed-loop control method Technical Field The invention relates to the technical field of industrial furnace thermal control and combustion regulation, in particular to a steel billet porous combustion uniform temperature closed-loop control method. Background The existing billet reheating furnace generally adopts a mode of district heating and synchronous adjustment of burner groups to control a heating system, and the controlled variables generally comprise parameters such as furnace temperature set values of a preheating section, a heating section and a soaking section, gas flow, combustion air flow, furnace pressure and the like; in order to adapt to the production takt and steel specification change, DCS closed-loop regulation is adopted in engineering, a thermal model or a prediction algorithm is utilized in a secondary system to correct a set value for stabilizing and controlling the temperature in a furnace and the heating load, for example, the published patent application CN101929736B discloses a heating furnace temperature control method based on a regenerative burner, the temperature regulation is realized by adopting a combined mode of analog continuous control and digital discrete burning stop control and taking the furnace temperature as a feedback quantity, and for example, the published patent application CN101256418B discloses a comprehensive control method for the outlet temperature of the heating furnace, and the temperature regulation stability of the furnace temperature or the outlet temperature is improved by adopting branch balance control and state feedback prediction control, but the feedback quantity still comes from the macro quantity such as the furnace temperature, partition temperature or outlet single point temperature, and the like, the characterization of the temperature difference of the billet along the length direction and the width direction cannot be realized, and the closed-loop inhibition is difficult to directly face the billet uniform temperature index; In actual production, the uniform temperature index of the steel billet is determined by the surface and the internal temperature field of the steel billet and is influenced by the distribution of the heat release quantity of each partition burner group, and the influence relationship has the characteristics of strong coupling, long lag time and obvious nonlinearity; the method is limited by the arrangement condition of temperature measurement points and measurement uncertainty of non-contact temperature measurement under the conditions of view field shielding, emissivity fluctuation and the like, the existing method is generally difficult to obtain effective feedback information capable of representing the temperature difference change of a billet along the length direction and the width direction on the premise of not increasing a complex contact temperature measuring device, and further the corresponding relation between the temperature difference of the billet and the actual effective heat release contribution of each zone burner group is difficult to establish; the method is characterized in that a furnace temperature or a partition temperature is used as a feedback quantity in the existing closed-loop control, so that the control quantity is mainly adjusted to meet the requirement of stable furnace temperature, and a billet temperature difference index cannot be directly restrained, therefore, when working condition disturbance, production takt change or heating mode switching occurs, the tail temperature difference in the billet head or the temperature difference in the edge is easily out of limits, the uniform temperature fluctuation is increased, and the convergence time is prolonged. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a billet multi-hole combustion uniform temperature closed-loop control method, which solves the problem that effective feedback information capable of representing the temperature difference change of a billet along the length direction and the width direction is difficult to obtain under the premise of not increasing a complex contact temperature measuring device in the traditional method. In order to achieve the above purpose, the present invention provides the following technical solutions: a steel billet porous combustion temperature-equalizing closed-loop control method comprises the following steps: s1, establishing a session, wherein a freezing furnace is distinguished into a zone rule, a burner group number, a temperature measurement point location map, a uniform temperature index caliber and a version effective boundary; S2, unifying the partition temperature measurement, the tapping temperature measurement, the combustion execution quantity and the furnace condition data with a time reference, performing admission judgment on the effectiveness of the data, and recording shielding,