CN201344735Y - Configuration monitoring system of continuous sintering furnace based on temperature field analysis - Google Patents

Configuration monitoring system of continuous sintering furnace based on temperature field analysis Download PDF

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CN201344735Y
CN201344735Y CNU2008201737640U CN200820173764U CN201344735Y CN 201344735 Y CN201344735 Y CN 201344735Y CN U2008201737640 U CNU2008201737640 U CN U2008201737640U CN 200820173764 U CN200820173764 U CN 200820173764U CN 201344735 Y CN201344735 Y CN 201344735Y
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temperature
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control
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districts
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曹树坤
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Jinan University
University of Jinan
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

The utility model relates to a temperature control system of a sintering furnace, in particular to configuration monitoring system of a continuous sintering furnace based on temperature field analysis. The configuration monitoring system comprises a continuous sintering furnace; the continuous sintering furnace comprises a degreasing section, a low-temperature sintering section, a high-temperature sintering section and a cold processing section; each section is provided with at least a sensor and a solid state relay and is connected with a temperature control instrument; the temperature control instrument is connected with an upper computer through a conversion interface; and the upper computer comprises an expert control subsystem and a configuration monitoring subsystem connected through ODBC. Aiming at the characteristics of the continuous sintering furnace such as nonlinear temperature control, large lagging and strong coupling, the configuration monitoring system of the continuous sintering furnace based on the temperature field analysis finishes the development of the temperature control system of the continuous sintering surface through the temperature field analysis, configuration software design and the like, thereby remarkably improving the precision of temperature control.

Description

Continuous fritting furnace configuration monitoring system based on temperature field analysis
Technical field
The utility model relates to the temperature control system of sintering furnace, specifically is a kind of continuous fritting furnace configuration monitoring system based on temperature field analysis.
Background technology
Traditional metal powder injection molded technology (Metal Injection Molding, single operations such as process using degreasing abbreviation MIM), sintering, cooling, in order to improve the quality of products, reduce the percent defective in the sintering process, consideration is integrated into comprehensive operation with traditional single operation, the notion of the continuous fritting furnace that just has been born.
Sintering furnace subject matter is that temperature control precision is not high, is difficult to determine stable production technology so in process of production.And sintering quality mainly is to be determined by the uniformity of temperature and the stability of sintering process.That is to say that the height of continuous fritting furnace temperature control precision directly has influence on the quality of product sintering quality.The heating process of sintering furnace be typical multivariable, big inertia, non-linear, the time complication system that becomes.Adopt the method for manual adjustment, the operating personnel's that place one's entire reliance upon practical experience and individual predictive ability, that may cause temperature exceeds allowed band than great fluctuation process, sintering quality is descended and wastes energy, and influences the life-span of agglomerating plant.
Therefore, adopt intelligent temperature-controlled process to become inevitable development trend for the temperature-controlled process of routine.It is a pith of Based Intelligent Control that the expert controls EC (Expert Control) technology, it is on the basis that the theory and technology with artificial intelligence AI (Artificial Intelligence) organically combines with control theory and method, imitation expert's intelligence under circumstances not known realizes the effective control to system.Expert control system and traditional PID adjustment combined is applied to many stoves section Continuous Sintering Furnace Temperature Field Control system, and to improving the performance of continuous fritting furnace temperature control system, energy savings has profound significance significantly aspect the engineering practical application.
From domestic and international pertinent literature, less for the temperature controlled research of sintering furnace, major part is the research to the control of furnace temps such as resistance furnace, boiler, kiln.Computer control has been adopted in the control of large scale industry furnace temp abroad, and various advanced persons' intelligence control method is applied to temperature control.Particularly fuzzy control technology, expert's control technology have obtained good control effect in Control for Kiln Temperature.In large-scale distributed computer control system, adopt temperature control single-loop regulator to realize mostly with various intelligent control algorithms and communication function.
The utility model content
The purpose of this utility model is exactly the deficiency at above-mentioned technology, by introduce expert's control technology and and traditional PID adjustment combine a kind of high-precision system that the temperature field of continuous fritting furnace is controlled be provided, improved the performance of continuous fritting furnace temperature control system greatly.
The utility model is realized by following technology: this continuous fritting furnace configuration monitoring system based on temperature field analysis comprises continuous fritting furnace, continuous fritting furnace comprises the degreasing section, the low-temperature sintering section, high temperature sintering section and cold treatment section, each section is provided with an at least one sensor and a solid-state relay, and be connected with temperature control instrument, the host computer that temperature control instrument is handled by the translation interface link information, translation interface can be RS232/RS485 converter ZW485C, host computer is used for temperature field analysis, can be set to comprise expert's RACS and the configuration monitoring subsystem that connects by ODBC, wherein
Expert's RACS comprises feature identification and information management unit, knowledge base, inference machine and control law collection, and feature identification and information management unit are used for the temperature control instrument information transmitted handled and send into respectively knowledge base and inference machine; Knowledge base is used to store the knowledge in continuous fritting furnace control field, and the rule and the knowledge that provide the problem of finding the solution to follow, need for inference machine, according to input information the rule in the knowledge base is made amendment; Search finding is to the control corresponding rule from knowledge base for inference machine, and the setting value that the expert is provided is delivered to reference to the control input end on the one hand, on the other hand actuator is controlled in the action of expert's appointment.
The configuration monitoring subsystem is used for gathering in real time controlled regional temperature parameter, and realizes the executing agency of control in real time.As seen, temperature parameter processing that slave computer is gathered and system all will realize by continuous fritting furnace temperature control system monitor supervision platform the control of executing agency.Realize the continuous fritting furnace temperature control system monitoring and control configuration and the design of communicating by letter, requirement can dynamically show the environmental aspect in controlled zone, makes things convenient for the user to finish various monitoring and management function again.
Preferably, continuous fritting furnace is can subregion as follows: the degreasing section is divided into 3 districts, the low-temperature sintering section is divided into 4 districts, the high temperature sintering section is divided into 3 districts, cooling section is as 1 district, amount to 11 districts, be defined as successively from the degreasing section to cooling section the 1st district, 2 districts ..., 11 districts, each is distinguished correspondence and is provided with a sensor and a solid-state relay.Like this, utilize the thermal analysis module in the host computer that the temperature of continuous fritting furnace is carried out sunykatuib analysis, each district's analysis of temperature field is needed all to consider that environmental factors such as atmosphere, pressure, proparea and back zone are to the influence in this district etc.
The bottom control part of expert's RACS still adopts PID control, expert's control section is as the parent body of bottom control, specific requirement according to control, can do basic control procedure and revise and adjust, to realize the target of control system, in concrete implementation procedure, can be by expert control system being embedded into the control that reaches in the conventional control the control object.
The reference control input that the expert instructs has: measured temperature, theory setting value and the assay value in low-temperature sintering section, high temperature sintering Duan Ge district.The output collection of controller: the temperature reference setting value in low-temperature sintering section, high temperature sintering Duan Ge district, fault alarm etc.
The continuous fritting furnace configuration monitoring system that the utility model provides based on temperature field analysis, the characteristics of, large time delay non-linear, close coupling at continuous sintering furnace temperature control, by temperature field analysis, design of Configuration Software etc., finish the exploitation of continuous fritting furnace temperature control system, significantly improved temperature controlled precision.Can realize the temperature control error have ± 7 ℃ be reduced to ± 2 ℃, significantly improved the product sintering quality, have good economic benefit.
Description of drawings
Fig. 1 is the continuous fritting furnace temperature control system general frame of the embodiment of the invention;
Fig. 2 is a continuous fritting furnace expert control system The general frame in the embodiment of the invention;
Fig. 3 is a continuous fritting furnace expert control system control flow chart;
Fig. 4 is the integrated block diagram of expert's control with configuration monitoring;
Fig. 5 is an expert system database design view;
Fig. 6 for the atmosphere furnace door switch influence the result data table (℃);
Fig. 7 is that last district influences the result data table to analysis area;
Fig. 8 is regular texture definition figure;
Fig. 9 is an expert system rule storehouse Design view;
Figure 10 is an expert system rule library storage form schematic diagram;
Figure 11 is the inference machine flow chart;
The specific embodiment
Further explain, illustrate the technical program with non-limiting embodiment below.
A kind of continuous fritting furnace configuration monitoring system based on temperature field analysis, as shown in Figure 1, comprise continuous fritting furnace, continuous fritting furnace comprises the degreasing section, the low-temperature sintering section, high temperature sintering section and cold treatment section, continuous fritting furnace is can subregion as follows: the degreasing section is divided into 3 districts, the low-temperature sintering section is divided into 4 districts, the high temperature sintering section is divided into 3 districts, cooling section is as 1 district, amount to 11 districts, be defined as the 1st district successively from the degreasing section to cooling section, 2 districts, ..., 11 districts, each district's correspondence is provided with a sensor and a solid-state relay, and be connected with temperature control instrument, and adopting the remittance XMT624 of nation intelligence instrument, temperature control instrument connects host computer by translation interface, translation interface is RS232/RS485 converter ZW485C, host computer comprises expert's RACS and the configuration monitoring subsystem that connects by ODBC, and as shown in Figure 4, the integrated operation of expert's control and configuration software has realized control network and information network, information network links with the expert control system database data, exchange.
As Fig. 2, shown in Figure 3, expert's RACS comprises feature identification and information management unit, knowledge base, inference machine and control law collection, and feature identification and information management unit are used for the temperature control instrument information transmitted handled and send into respectively knowledge base and inference machine; Knowledge base is used to store the knowledge in continuous fritting furnace control field, and the rule and the knowledge that provide the problem of finding the solution to follow, need for inference machine, according to input information the rule in the knowledge base is made amendment; Search finding is to the control corresponding rule from knowledge base for inference machine, and the setting value that the expert is provided is delivered to reference to the control input end on the one hand, on the other hand actuator is controlled in the action of expert's appointment.
The configuration monitoring subsystem is used for gathering in real time controlled regional temperature parameter, and realizes the executing agency of control in real time.As seen, temperature parameter processing that slave computer is gathered and system all will realize by continuous fritting furnace temperature control system monitor supervision platform the control of executing agency.Realize the continuous fritting furnace temperature control system monitoring and control configuration and the design of communicating by letter, requirement can dynamically show the environmental aspect in controlled zone, makes things convenient for the user to finish various monitoring and management function again.
At first realize structure for expert's RACS.According to the functional structure of expert system in control system, can be divided into direct type and indirect-type expert control system.What the technical program adopted is the indirect-type expert control system, partly is made up of knowledge base, inference machine, control law collection etc.
The bottom control part of expert control system still adopts PID control, and expert's control section, can be done to revise and adjust, to realize the target of control system according to the specific requirement of control as the parent body of bottom control to basic control procedure.In concrete implementation procedure, can be by expert control system being embedded into the control that reaches in the conventional control the control object, concrete structure is as shown in Figure 2.
The reference control input that the expert instructs has: measured temperature, theory setting value and the assay value in low-temperature sintering section, high temperature sintering Duan Ge district.The output collection of controller: the temperature reference setting value in low-temperature sintering section, high temperature sintering Duan Ge district, fault alarm etc.The concrete control flow of continuous fritting furnace expert control system as shown in Figure 3.The outside input information of system enters feature identification and information management unit, sends into knowledge base and inference machine after the information processing respectively.Knowledge base is made amendment to the rule in the knowledge base according to input information, and search finding is to the control corresponding rule from knowledge base for inference machine, and the setting value that the expert is provided is delivered to reference to the control input end on the one hand.On the other hand actuator is controlled in the action of expert's appointment.The configuration software main task is: on the one hand, it will utilize real-time data base that on-the-spot real time data is conducted interviews, stores; On the other hand, realize linking and exchange with the data of Expert Controller.
Design specialist's system database then.The expert system database as knowledge memory, both had been used to store the knowledge in continuous fritting furnace control field, was followed by inference machine provides the problem of finding the solution again simultaneously, needed rule and knowledge.Native system carries out the design library of expert system database based on access 2000, and Design view as shown in Figure 5.A step all must walking when this figure is the access definition database, " decimal point " are represented the significant figure number of words behind the decimal point of these data.
Be used to store the database table that each district is subjected to such environmental effects such as atmosphere, stove door switch, as shown in Figure 6.
Be used to store the database table of last district, as shown in Figure 7 to the influence of analysis area temperature field.Wherein AV21 is to analysis area temperature field analysis value under the last district heated condition; AV22 is last district this district's temperature field analysis value when stopping to heat.
Set up the expert system rule storehouse then.For guaranteeing reliability, the universality of expert control system, must set up control law set certain scale, good.For this reason, the knowledge and the data that get access to have been carried out comparatively careful analysis and processing:
(1) temperature in low-temperature sintering zone control.The low-temperature sintering section is made up of 4 districts, and beginning from fire door is low-temperature sintering 4 districts, low-temperature sintering 5 districts, low-temperature sintering 6 districts, low-temperature sintering 7 districts successively.4 districts have arranged four thermocouples respectively, and the thermocouple in 4 districts is arranged in 1/3rd places near fire door, and the thermocouple in 5 districts, 6 districts, 7 districts is arranged in the centre position in this district.At low-temperature sintering section the influencing each other that mainly be the analytical furnace door switch to temperature field between the influence in temperature field and each district.The detected temperature value of thermocouple is the temperature value of this point, and from the distribution of analysis temperature field, detected temperature value of thermocouple and actual temperature value have certain difference, has therefore just caused the reduction of control temperature accuracy.
(2) control in high temperature sintering zone.The high temperature sintering section is made up of 3 districts.Beginning from the place that is connected with the low-temperature sintering section is 8 districts, 9 districts and 10 districts successively.Wherein the temperature in 9 districts is the highest.At the high temperature sintering section mainly is analytical gas factor influencing each other to the influence of Continuous Sintering Furnace Temperature Field and between respectively distinguishing.
If error E=| AV-PV|, E Ij=| AV Ij-PV Ij| (i=4,2---10, j=1,2,3).I represents 7 measurement points of sintering stage, and j represents 3 kinds of analysis situations.E for example 41=| AV 41-PV 41|, the error of the 4th district under first kind of factor affecting that expression is measured.First district only is subjected to the influence of two kinds of factors, an influence that is stove door switch to it, and one is the influence of Hou Yi district to it, the Hou Yi district is divided into when heating again and two kinds of situations when not heating, so error has E 41, E 431, E 432The 10th district also only is subjected to the influence of two kinds of situations, and a kind of is the influence of gas factor, a kind of be last district to its Temperature Influence, last district is divided into when heating again and two kinds of situations when not heating, so error has E 101, E 1021, E 1022
According to above-mentioned analysis, the control law ensemble of continuous fritting furnace expert control system is divided into 7 regular subclass, i.e. 7 district's control laws separately of sintering stage.Not mutually isolated between each subclass but close association, coordinate mutually.Continuous fritting furnace expert control system regular collection adopts the mode of IF " condition " THEN " conclusion ", and IF (true 1), (true 2) ... (true n) THEN (true 1), (true 2) ... the mode of (true n) is expressed.
Such as, low-temperature sintering section the 5th district's control law is as follows:
Rule 1:IF (E 51＞E 521＞E 522OR E 51＞E 522＞E 521) AND (E 51＞E 531＞E 532OR E 51＞E 532＞E 531)
THEN RV=AV 51(continuing heating);
Rule 2:IF E 51＜E 522＜E 521AND (E 531＜E 532＜E 51OR E 532＜E 531＜E 51)
THEN RV=AV 521(continuing heating);
Rule 3:IF E 51＜E 521＜E 522AND (E 531＜E 532＜E 51OR E 532＜E 531＜E 51)
THEN RV=AV 522(continuing heating);
Rule 4:IF (E 521＜E 522＜E 51OR E 522＜E 521＜E 51) AND E 51＜E 532＜E 531
THEN RV=AV 531(stopping heating);
Rule 5:IF (E 521＜E 522＜E 51OR E 522＜E 521＜E 51) AND E 51＜E 531＜E 532
THEN RV=AV 532(stopping heating);
。。。
Production rule is made of rule number, rule condition and rule conclusion, every rule can be regarded as a rule objects from the object-oriented method angle.For ease of the tissue and the application of knowledge, regular texture defines as shown in Figure 8, expert system rule storehouse Design view as shown in Figure 9, storage format is as shown in figure 10.
Carry out the inference machine design then.Can adopt the forward reasoning mode, be basis with the knowledge base, reasoning process such as Figure 11, and The reasoning results will be as the output of expert control system.
Step 1401 judges whether to produce new fact.
If do not produce new fact, then EP (end of program); If have, then enter step 1402, call the rule match process.
If step 1403 is n=0, then EP (end of program); If n＞0 is then judged and is activated regular number.
If n=1 then enters step 1406; If n＞1 then enters step 1405.
Step 1405, conflict resolution is selected an applicable rule.
Enter step 1406, judge whether the same fact.
If have, then begin next circulation; If no, then enter step 1407.
1407, more new database enters next circulation then.
Need to realize the temperature system configuration monitoring then.In order to obtain the dynamic temperature value in low-temperature sintering section, high temperature sintering Duan Ge district more intuitively, under Visual C++ environment, designed the configuration monitoring interface of continuous fritting furnace temperature control system.
The function that realize at the monitoring and control configuration interface: 1. measured temperature and setting value are respectively distinguished in the dynamic demonstration of Presentation Function, and by this function, the user can hold the Continuous Sintering Furnace Temperature Field situation comprehensively.2. handoff functionality can realize dynamically showing the switching at each measured value of distinguishing, setting value, theory analysis value setting interface.The click switching push button enters parameters in series and sets total interface, clicks Input SV button and enters sintering temperature SV setting interface, can respectively distinguish the setting of SV value.
XMT624 temperature control instrument communication interface is the RS485 interface, and is by RS232/RS485 converter ZW485C, interconnected with host computer.The technical program is taked half-duplex mode, host computer timed sending reading order constantly reads the detected temperature signal of slave computer, and is made decisions rapidly by expert system, slave computer is sent parameter modification or order is set, with the duty of control heating element heater.
Utilize host computer that continuous fritting furnace preheating section and high temperature sintering section temperature field are carried out sunykatuib analysis below, each district's analysis of temperature field is all needed to consider the influence to this district of environmental factors such as atmosphere, pressure, proparea, back zone.
At first consider the temperature analysis under the such environmental effects.For avoiding the oxidation in the blank sintering, be convenient to waste gas discharge in the burner hearth simultaneously, sintering stage need feed process gas.Gas is injected by the high temperature sintering section, and flow direction is reverse with the operation of material boat, need take into account during temperature field analysis.The desired temperature in high temperature section 8 districts, 9 districts, 10 districts is respectively 1050 ℃, 1250 ℃, 1220 ℃, from analysis result as can be seen three district's temperature become respectively 1049 ℃, 1247 ℃, 1214 ℃ and the setting value differ 1 ℃, 3 ℃ and 6 ℃ respectively.The desired temperature in low-temperature zone 4 districts, 5 districts, 6 districts, 7 districts is respectively 400 ℃, 430 ℃, 480 ℃, 680 ℃, from analysis result as can be seen the temperature in four districts become 395.72 ℃, 427.03 ℃, 478.5 ℃, 678.63 ℃ respectively.Temperature difference is respectively 4.28 ℃, 2.97 ℃, 2.5 ℃, 1.37 ℃.Stove door switch is to the temperature effect maximum in 4 districts as can be seen, and this is near fire door, to the minimum that influences in 7 districts because of 4 districts.Therefore the switch of fire door can be ignored the influence of high temperature section.
Consider that then last district is to the temperature field analysis under the analysis area influence.Sintering stage is respectively distinguished the temperature field and is had close coupling, need carry out deep analysis.At first analyze of the influence of last district to analysis area, be divided into again that last district stops to heat, in the last district heating process to the influence in this temperature field, district.6 districts with low-temperature zone are that example is analyzed last district, and promptly heat, do not heat under two kinds of situations 6 district's Temperature Influence in the 5th district.Under 5 district's heated conditions to the influence in 6 districts.6 district's temperature are that 478.42 ℃ and setting value differ 1.58 ℃.Under 5 district's cases without heating, 6 district's temperature analysis values are 476.86 ℃, differ 3.14 ℃ with theoretical value.This shows that 5 districts are little to the temperature effect in 6 districts when not heating in when heating.
Consider that again the Hou Yi district is to the temperature field analysis under the analysis area influence.The Hou Yi district equally also is in two kinds of situation to the influence in analysis area temperature field, one be Hou Yi district heating, do not heat under the two states influence to institute's analysis area.Be analytic target with the 6th district equally, under 7 district's heated conditions, to the influence in temperature field, 6 district, 6 district's temperature analysis values are 482.82 ℃, exceed 2.82 ℃ than setting value.When did not heat in 7 districts, to the influence in temperature field, 6 district, the temperature in analysis result 6 districts was 481.86 ℃, with the setting value difference be 1.86 ℃.
According to above by above to each district's analysis of temperature field, for the structure of expert system provides foundation.

Claims (3)

1. continuous fritting furnace configuration monitoring system based on temperature field analysis, comprise continuous fritting furnace, continuous fritting furnace comprises degreasing section, low-temperature sintering section, high temperature sintering section and cold treatment section, it is characterized in that: each section is provided with an at least one sensor and a solid-state relay, and be connected with temperature control instrument, temperature control instrument is by the host computer of translation interface connection process information, and host computer comprises expert's RACS and the configuration monitoring subsystem that connects by ODBC.
2. the continuous fritting furnace configuration monitoring system based on temperature field analysis according to claim 1 is characterized in that: described translation interface is the RS232/RS485 converter.
3. the continuous fritting furnace configuration monitoring system based on temperature field analysis according to claim 1, it is characterized in that: the degreasing section is divided into 3 districts, the low-temperature sintering section is divided into 4 districts, the high temperature sintering section is divided into 3 districts, cooling section is as 1 district, and each district's correspondence is provided with a sensor and a solid-state relay.
CNU2008201737640U 2008-10-16 2008-10-16 Configuration monitoring system of continuous sintering furnace based on temperature field analysis Expired - Fee Related CN201344735Y (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107107197A (en) * 2015-01-08 2017-08-29 林德股份公司 Control the apparatus and method of sintering process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107107197A (en) * 2015-01-08 2017-08-29 林德股份公司 Control the apparatus and method of sintering process

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