CN116659251A - System and method for judging stability of materials in continuous graphitization and purification furnace - Google Patents

System and method for judging stability of materials in continuous graphitization and purification furnace Download PDF

Info

Publication number
CN116659251A
CN116659251A CN202310375551.5A CN202310375551A CN116659251A CN 116659251 A CN116659251 A CN 116659251A CN 202310375551 A CN202310375551 A CN 202310375551A CN 116659251 A CN116659251 A CN 116659251A
Authority
CN
China
Prior art keywords
comment
furnace
membership function
evaluation factor
evaluation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310375551.5A
Other languages
Chinese (zh)
Inventor
刘永清
龚进
龚俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Bobangshan River New Materials Co ltd
Original Assignee
Hunan Bobangshan River New Materials Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan Bobangshan River New Materials Co ltd filed Critical Hunan Bobangshan River New Materials Co ltd
Priority to CN202310375551.5A priority Critical patent/CN116659251A/en
Publication of CN116659251A publication Critical patent/CN116659251A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/20—Graphite
    • C01B32/205—Preparation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
    • F27D2019/0009—Monitoring the pressure in an enclosure or kiln zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
    • F27D2019/0018—Monitoring the temperature of the atmosphere of the kiln
    • 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
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

A system and a method for judging the stability of materials in a continuous graphitization and purification furnace comprise an infrared temperature measuring device, a weighing device and a pressure sensor, and a PLC electrically connected with the infrared temperature measuring device, the weighing device and the pressure sensor; the infrared temperature measuring device is used for collecting temperatures of a plurality of measuring points in the continuous graphitizing and purifying furnace in real time and transmitting the temperatures to the PLC in real time; the weighing device is used for measuring the weight of the materials entering the continuous graphitizing and purifying furnace in real time, measuring the weight of the materials discharged from the continuous graphitizing and purifying furnace in real time and transmitting the weight to the PLC in real time; the pressure sensor is used for measuring the air pressure in the continuous graphitization and purification furnace in real time and transmitting the air pressure to the PLC in real time; the PLC comprehensively judges the stability of materials in the continuous graphitization and purification furnace according to three evaluation factors, namely the temperature change rate, the weight deviation rate and the pressure change rate in the continuous graphitization and purification furnace.

Description

System and method for judging stability of materials in continuous graphitization and purification furnace
Technical Field
The application relates to the technical field of graphitization production furnaces, in particular to a system for judging the stability of materials in a continuous graphitization and purification furnace; the application also relates to a method for judging the stability of the materials in the continuous graphitization and purification furnace.
Background
Although the Acheson furnace is widely used in the technical field of graphitization production furnaces, the Acheson furnace is a periodically produced intermittent furnace, and the continuous furnace is an important subject and pursuit target of world attention and research and development because of the defects of low productivity, quality fluctuation, high electricity consumption, bad operation environment and the like caused by discontinuous production. There are two types of continuous furnaces tested at present, one is a single-function graphitizing furnace, namely, a graphitizing product can be continuously produced through the continuous furnace after roasting the carbon product, and the graphitizing furnace is called a single furnace. The other is a multifunctional combined furnace, namely a double furnace integrating two processes of roasting and graphitizing into a whole and a triple furnace integrating three processes of profiling, roasting and graphitizing.
The continuous graphitizing and purifying furnace is one kind of continuous graphite purifying thermal equipment, and the material to be treated enters the furnace via the feeder and moves gradually to the heating area to graphitize at high temperature, and then passes through the cooling area gradually and finally the discharger to obtain the product.
Continuous graphitization and purification furnaces are generally additionally provided with a device with constant pressure so as to ensure the stability in the raw material processing process, but the raw material quantity passing through an electric field is difficult to control, and the graphite column of the anode is gradually shortened in the use process, so that the actual power can be fluctuated, and the production stability is difficult to ensure. In the running process of the continuous high-temperature graphitization furnace, the materials in the furnace are in a state which can not be directly observed, and an effective solution is not provided at present aiming at the problem of judging the stability of the materials. However, in the graphitization production process, stable and continuous circulation of materials is important, and is a precondition for mass production of high-purity graphite. Once the condition of the blockage in the producer is reached, the quality and the yield of the finished product are affected, and in severe cases, production accidents can even be caused.
Therefore, the research has important significance for judging the stability of the continuous graphitization and purification furnace and avoiding quality fluctuation and production accidents in the production process.
Disclosure of Invention
The present application is directed to solving at least one of the deficiencies of the prior art. Therefore, the technical problem solved by the application is to provide a system for judging the stability of the materials in the continuous graphitization and purification furnace and a method for judging the stability of the materials in the continuous graphitization and purification furnace, which can judge the stability of the materials in the continuous graphitization and purification furnace at proper time and provide early warning information for avoiding quality fluctuation and production accidents in the production process.
In order to solve the technical problems, in one aspect, the application provides a method for judging the stability of materials in a continuous graphitization and purification furnace, which comprises the following steps:
the infrared temperature measuring device detects the temperatures of a plurality of measuring points in the continuous graphitization and purification furnace in real time and transmits the temperatures to the PLC in real time;
the weighing device measures the weight of the materials entering the continuous graphitizing and purifying furnace in real time, measures the weight of the materials discharged from the continuous graphitizing and purifying furnace in real time, and transmits the weight to the PLC in real time;
the pressure sensor detects the air pressure in the continuous graphitizing and purifying furnace in real time and transmits the air pressure to the PLC in real time;
the PLC comprehensively judges the stability of materials in the continuous graphitization and purification furnace according to three evaluation factors of the temperature change rate, the weight deviation rate and the pressure change rate in the continuous graphitization and purification furnace, wherein the judging process is as follows:
firstly, establishing an evaluation factor set U for comprehensively evaluating the stability of materials, wherein the evaluation factors comprise:
1) Rate of change of temperature u 1 When the continuous graphitization and purification furnace is heated to the target temperature required by the process, the smaller the temperature change rate is, the better the stability of the materials in the furnace is,
the PLC calculates the temperature change rate u according to the following formula 1
Wherein t is 1 Average temperature value in DEG C detected for each measurement point at the beginning of a time period
t 2 For the average temperature value detected at each measuring point at the end of the time period, in DEG C
T is a time period, unit min;
2) Weight deviation ratio u 2 The weight deviation rate is maintained at a smaller value, which indicates that the stability of the materials in the continuous graphitization and purification furnace is better,
the PLC calculates the weight deviation ratio u according to the following formula 2
Wherein w is 1 For inputting the accumulated weight of the materials in the continuous graphitization and purification furnace in the time period, the unit Kg
w 2 The unit Kg is the accumulated weight of the materials output from the continuous graphitization and purification furnace in the time period;
3) Rate of change of pressure u 3 The smaller the pressure change rate is, the better the material stability is, the air pressure in the furnace is in a dynamic balance state,
the PLC calculates the pressure change rate u according to the following formula 3
Wherein p is 1 For continuous graphitization at the beginning of the time period, the unit Pa is the detected value of the air pressure in the purifying furnace
p 2 For continuous graphitization at the end of the time period, the unit Pa is the detected value of the air pressure in the purifying furnace
T is a time period, unit min;
from this, the evaluation factor set u= { U 1 ,u 2 ,u 3 "u 1 ,u 2 ,u 3 Corresponding to a specific working condition;
(II) setting a comment set V= { V of each factor 1 ,v 2 ,v 3 The method comprises the steps of (1) setting a membership function of each evaluation factor to a comment set V, wherein the membership function is used for representing the degree of coincidence of a single factor to comments, and the maximum value of the membership function is 1, and the minimum value of the membership function is 0;
(III) calculating a fuzzy comprehensive evaluation matrix R
Evaluation factor u 1 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 1 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 1 For comment v 3 The membership function of (2) is as follows:
will u 1 Respectively substituting the values of (a) into the membership function A 1 、A 2 、A 3 X in (2), the evaluation factor u can be obtained 1 Membership vector R of (2) 1 ＝{r 11 ,r 12 ,r 13 }；
Evaluation factor u 2 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 2 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 2 For comment v 3 The membership function of (2) is as follows:
will u 2 Respectively substituting the values of (a) into membership functionsNumber B 1 、B 2 、B 3 X in (2), the evaluation factor u can be obtained 2 Membership vector R of (2) 2 ＝{r 21 ,r 22 ,r 23 }；
Evaluation factor u 3 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 3 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 3 For comment v 3 The membership function of (2) is as follows:
will u 3 Respectively substituting the values of (2) into membership function C 1 、C 2 、C 3 X in (2), the evaluation factor u can be obtained 3 Membership vector R of (2) 3 ＝{r 31 ,r 32 ,r 33 }；
The single factor membership vector R obtained by the calculation 1 ，R 2 ，R 3 For the rows, form a fuzzy comprehensive evaluation matrix R of 3 rows and 3 columns 3*3 ；
(IV) determining an evaluation factor weight vector Q= { Q 1 ,q 2 ,q 3 }, where q 1 ,q 2 ,q 3 Representing 3 evaluation factors u 1 ,u 2 ,u 3 And q 1 +q 2 +q 3 ＝1；
(V) calculating the comprehensive evaluation result S, using matrix multiplicationCalculate s=qr= { S 1 ,s 2 ,s 3 (s is therein 1 ,s 2 ,s 3 Represents the current evaluation factor set u= { U 1 ,u 2 ,u 3 For each element V of comment set V 1 ,v 2 ,v 3 Membership degree of s is taken as 1 ,s 2 ,s 3 The maximum value of the components can be obtained comprehensive comments of the current working conditions; if s 1 Maximum, give comment v 1 "good"; if s 2 Maximum, give comment v 2 If "pass" s 3 Maximum, give comment v 3 'bad' and alarm prompt.
In order to solve the technical problems, on the other hand, the application provides a system for judging the stability of materials in a continuous graphitization and purification furnace, which comprises an infrared temperature measuring device, a weighing device and a pressure sensor, and a PLC electrically connected with the infrared temperature measuring device, the weighing device and the pressure sensor; the infrared temperature measuring device is used for collecting temperatures of a plurality of measuring points in the continuous graphitizing and purifying furnace in real time and transmitting the temperatures to the PLC in real time;
the weighing device is used for measuring the weight of the materials entering the continuous graphitizing and purifying furnace in real time, measuring the weight of the materials discharged from the continuous graphitizing and purifying furnace in real time and transmitting the weight to the PLC in real time;
the pressure sensor is used for measuring the air pressure in the continuous graphitization and purification furnace in real time and transmitting the air pressure to the PLC in real time;
the PLC comprehensively judges the stability of materials in the continuous graphitization and purification furnace according to three evaluation factors including the temperature change rate, the weight deviation rate and the pressure change rate in the continuous graphitization and purification furnace, wherein the judging process is as follows:
firstly, establishing an evaluation factor set U for comprehensively evaluating the stability of materials, wherein the evaluation factors comprise:
1) Rate of change of temperature u 1 When the continuous graphitization and purification furnace is heated to the target temperature required by the process, the smaller the temperature change rate is, the better the stability of the materials in the furnace is,
the PLC calculates the temperature change according to the following formulaConversion u 1
Wherein t is 1 Average temperature value in DEG C detected for each measurement point at the beginning of a time period
t 2 For the average temperature value detected at each measuring point at the end of the time period, in DEG C
T is a time period, unit min;
2) Weight deviation ratio u 2 The weight deviation rate is maintained at a smaller value, which indicates that the stability of the materials in the continuous graphitization and purification furnace is better,
the PLC calculates the weight deviation ratio u according to the following formula 2
Wherein w is 1 For inputting the accumulated weight of the materials in the continuous graphitization and purification furnace in the time period, the unit Kg
w 2 The unit Kg is the accumulated weight of the materials output from the continuous graphitization and purification furnace in the time period;
3) Rate of change of pressure u 3 The smaller the pressure change rate is, the better the material stability is, the air pressure in the furnace is in a dynamic balance state,
the PLC calculates the pressure change rate u according to the following formula 3
Wherein p is 1 For continuous graphitization at the beginning of the time period, the unit Pa is the detected value of the air pressure in the purifying furnace
p 2 For continuous graphitization at the end of the time period, the unit Pa is the detected value of the air pressure in the purifying furnace
T is a time period, unit min;
thereby obtaining the cause of evaluationElement set u= { U 1 ,u 2 ,u 3 "u 1 ,u 2 ,u 3 Corresponding to a specific working condition;
(II) setting a comment set V= { V of each factor 1 ,v 2 ,v 3 The method comprises the steps of (1) setting a membership function of each evaluation factor to a comment set V, wherein the membership function is used for representing the degree of coincidence of a single factor to comments, and the maximum value of the membership function is 1, and the minimum value of the membership function is 0;
(III) calculating a fuzzy comprehensive evaluation matrix R
Evaluation factor u 1 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 1 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 1 For comment v 3 The membership function of (2) is as follows:
will u 1 Respectively substituting the values of (a) into the membership function A 1 、A 2 、A 3 X in (2), the evaluation factor u can be obtained 1 Membership vector R of (2) 1 ＝{r 11 ,r 12 ,r 13 }；
Evaluation factor u 2 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 2 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 2 For comment v 3 The membership function of (2) is as follows:
will u 2 Respectively substituting the values of (a) into the membership function B 1 、B 2 、B 3 X in (2), the evaluation factor u can be obtained 2 Membership vector R of (2) 2 ＝{r 21 ,r 22 ,r 23 }；
Evaluation factor u 3 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 3 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 3 For comment v 3 The membership function of (2) is as follows:
will u 3 Respectively substituting the values of (2) into membership function C 1 、C 2 、C 3 X in (2), the evaluation factor u can be obtained 3 Membership vector R of (2) 3 ＝{r 31 ,r 32 ,r 33 }；
The single factor membership vector R obtained by the calculation 1 ，R 2 ，R 3 For the rows, form a fuzzy comprehensive evaluation matrix R of 3 rows and 3 columns 3*3 ；
(IV) determining an evaluation factor weight vector Q= { Q 1 ,q 2 ,q 3 }, where q 1 ,q 2 ,q 3 Representing 3 evaluation factors u 1 ,u 2 ,u 3 And q 1 +q 2 +q 3 ＝1；
(fifth) calculating the comprehensive evaluation result S, calculating s=qr= { S using matrix multiplication 1 ,s 2 ,s 3 (s is therein 1 ,s 2 ,s 3 Represents the current evaluation factor set u= { U 1 ,u 2 ,u 3 For each element V of comment set V 1 ,v 2 ,v 3 Membership degree of s is taken as 1 ,s 2 ,s 3 The maximum value of the components can be obtained comprehensive comments of the current working conditions; if s 1 Maximum, give comment v 1 "good"; if s 2 Maximum, give comment v 2 If "pass" s 3 Maximum, give comment v 3 'bad' and alarm prompt.
According to the technical scheme provided by the application, based on the temperature and pressure of the furnace cavity of the continuous graphitization and purification furnace, the weight of the materials entering the continuous graphitization and purification furnace is detected, the weight of the materials discharged from the continuous graphitization and purification furnace is detected, the judgment of the operation condition of the materials in the furnace is realized, and the alarm prompt is carried out on the condition that the continuous graphitization and purification furnace generates unsmooth material circulation, so that the production risk can be prevented and reduced, and the product quality is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the application, and are not to be construed as limiting the application in any way. In the drawings:
FIG. 1 is a schematic diagram of a system for determining the stability of materials in a continuous graphitization and purification furnace according to an embodiment.
Detailed Description
The application is further illustrated below with reference to examples.
As shown in fig. 1, the system for judging the stability of the materials in the continuous graphitization and purification furnace comprises an infrared temperature measuring device 2, a feeding weighing device 4, a discharging weighing device 5 and a pressure sensor 3, and a PLC6 electrically connected with the infrared temperature measuring device 2, the feeding weighing device 4, the discharging weighing device 5 and the pressure sensor 3; the infrared temperature measuring device is used for collecting temperatures of a plurality of measuring points in the continuous graphitization and purification furnace 1 in real time and transmitting the temperatures to the PLC in real time; the weighing device is used for measuring the weight of the materials entering the continuous graphitizing and purifying furnace in real time, measuring the weight of the materials discharged from the continuous graphitizing and purifying furnace in real time and transmitting the weight to the PLC in real time; the pressure sensor is used for measuring the air pressure in the continuous graphitization and purification furnace in real time and transmitting the air pressure to the PLC in real time; the PLC comprehensively judges the stability of materials in the continuous graphitization and purification furnace according to three evaluation factors, namely the temperature change rate, the weight deviation rate and the pressure change rate in the continuous graphitization and purification furnace.
The method for judging the stability of the materials in the continuous graphitization and purification furnace comprises the following steps:
the infrared temperature measuring device detects the temperatures of a plurality of measuring points in the continuous graphitization and purification furnace in real time and transmits the temperatures to the PLC in real time;
the weighing device measures the weight of the materials entering the continuous graphitizing and purifying furnace in real time, measures the weight of the materials discharged from the continuous graphitizing and purifying furnace in real time, and transmits the weight to the PLC in real time;
the pressure sensor detects the air pressure in the continuous graphitizing and purifying furnace in real time and transmits the air pressure to the PLC in real time.
The PLC comprehensively judges the stability of materials in the continuous graphitization and purification furnace according to three evaluation factors of the temperature change rate, the weight deviation rate and the pressure change rate in the continuous graphitization and purification furnace, wherein the judging process is as follows:
firstly, establishing an evaluation factor set U for comprehensively evaluating the stability of materials, wherein the evaluation factors comprise:
1) Rate of change of temperature u 1 After the continuous graphitization and purification furnace is heated to the target temperature required by the process, the temperature is raisedThe smaller the degree change rate is, the better the stability of the materials in the furnace is,
the PLC calculates the temperature change rate u according to the following formula 1
Wherein t is 1 Average temperature value in DEG C detected for each measurement point at the beginning of a time period
t 2 For the average temperature value detected at each measuring point at the end of the time period, in DEG C
T is a time period, unit min;
2) Weight deviation ratio u 2 The weight deviation rate is maintained at a smaller value, which indicates that the stability of the materials in the continuous graphitization and purification furnace is better,
the PLC calculates the weight deviation ratio u according to the following formula 2
Wherein w is 1 For inputting the accumulated weight of the materials in the continuous graphitization and purification furnace in the time period, the unit Kg
w 2 The unit Kg is the accumulated weight of the materials output from the continuous graphitization and purification furnace in the time period;
3) Rate of change of pressure u 3 The smaller the pressure change rate is, the better the material stability is, the air pressure in the furnace is in a dynamic balance state,
the PLC calculates the pressure change rate u according to the following formula 3
Wherein p is 1 For continuous graphitization at the beginning of the time period, the unit Pa is the detected value of the air pressure in the purifying furnace
p 2 For continuous graphitization at the end of the time period, the unit P is the detected value of the air pressure in the purifying furnacea
T is a time period, unit min;
from this, the evaluation factor set u= { U 1 ,u 2 ,u 3 "u 1 ,u 2 ,u 3 Corresponding to a specific working condition;
(II) setting a comment set V= { V of each factor 1 ,v 2 ,v 3 The method comprises the steps of (1) setting a membership function of each evaluation factor to a comment set V, wherein the membership function is used for representing the degree of coincidence of a single factor to comments, and the maximum value of the membership function is 1, and the minimum value of the membership function is 0;
(III) calculating a fuzzy comprehensive evaluation matrix R
Evaluation factor u 1 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 1 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 1 For comment v 3 The membership function of (2) is as follows:
will u 1 Respectively substituting the values of (a) into the membership function A 1 、A 2 、A 3 X in (2), the evaluation factor u can be obtained 1 Membership vector R of (2) 1 ＝{r 11 ,r 12 ,r 13 }；
Evaluation factor u 2 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 2 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 2 For comment v 3 The membership function of (2) is as follows:
will u 2 Respectively substituting the values of (a) into the membership function B 1 、B 2 、B 3 X in (2), the evaluation factor u can be obtained 2 Membership vector R of (2) 2 ＝{r 21 ,r 22 ,r 23 }；
Evaluation factor u 3 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 3 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 3 For comment v 3 The membership function of (2) is as follows:
will u 3 Respectively substituting the values of (2) into membership function C 1 、C 2 、C 3 X in (2), the evaluation factor u can be obtained 3 Membership vector R of (2) 3 ＝{r 31 ,r 32 ,r 33 }；
The single factor membership vector R obtained by the calculation 1 ，R 2 ，R 3 For the rows, form a fuzzy comprehensive evaluation matrix R of 3 rows and 3 columns 3*3 ；
(IV) determining an evaluation factor weight vector Q= { Q 1 ,q 2 ,q 3 }, where q 1 ,q 2 ,q 3 Representing 3 evaluation factors u 1 ,u 2 ,u 3 And q 1 +q 2 +q 3 =1, according to the experimental conditions, the fixed value q= {0.35,0.35,0.3}, is taken in the examples;
(fifth) calculating the comprehensive evaluation result S, calculating s=qr= { S using matrix multiplication 1 ,s 2 ,s 3 (s is therein 1 ,s 2 ,s 3 Represents the current evaluation factor set u= { U 1 ,u 2 ,u 3 For each element V of comment set V 1 ,v 2 ,v 3 Membership degree of s is taken as 1 ,s 2 ,s 3 The maximum value of the components can be obtained comprehensive comments of the current working conditions; if s 1 Maximum, give comment v 1 "good"; if s 2 Maximum, give comment v 2 If "pass" s 3 Maximum, give comment v 3 'bad' and alarm prompt.
Example 1
Taking a time period T=5min in a certain period of the production process, and obtaining measurement data T 1 ＝2846℃，t 2 ＝2850℃，w 1 ＝15.4Kg，w 2 ＝15.0Kg，p 1 ＝920Pa，p 2 =1370; calculated from the above data:
/>
will u 1 =0.8 substitution into membership function a 1 、A 2 、A 3 X in (a) is respectively obtained as A 1 (x)＝0.7，A 2 (x)＝0.3，A 3 (x) =0, i.e. evaluation factor u 1 Membership vector R of (2) 1 ＝{0.7,0.3,0}；
Will u 2 =2.6 substitution into membership function B 1 、B 2 、B 3 X in (B) is obtained 1 (x)＝0.2，B 2 (x)＝0.8，B 3 (x) =0, i.e. evaluation factor u 2 Membership vector R of (2) 2 ＝{0.2,0.8,0}；
Will u 3 =90 substitution into membership function C 1 、C 2 、C 3 X in (b) is calculated as C 1 (x)＝0，C 2 (x)＝0.25，C 3 (x) =0.75, i.e. evaluation factor u 3 Membership vector R of (2) 3 ＝{0,0.25,0.75}
The single factor membership vector R obtained by the calculation 1 ，R 2 ，R 3 For the rows, form a fuzzy comprehensive evaluation matrix R of 3 rows and 3 columns 3*3
Taking q= {0.35,0.35,0.3}, calculate the comprehensive evaluation matrix S:
taking the maximum value element S of the calculation result S 2 =0.46, give comment v 2 Qualified.
Example 2
A certain period of time in the production process, the time period T=5min, and the measurement data T is obtained 1 ＝2859℃，t 2 ＝2857℃，w 1 ＝16.4Kg，w 2 ＝16.1Kg，p 1 ＝1055Pa，p 2 ＝853PaThe method comprises the steps of carrying out a first treatment on the surface of the Calculated from the above data:
will u 1 =0.4 substitution into membership function a 1 、A 2 、A 3 X in (a) is respectively obtained as A 1 (x)＝1，A 2 (x)＝0，A 3 (x) =0, i.e. evaluation factor u 1 Membership vector R of (2) 1 ＝{1,0,0}；
Will u 2 =1.8 substitution into membership function B 1 、B 2 、B 3 X in (B) is obtained 1 (x)＝0.6，B 2 (x)＝0.4，B 3 (x) =0, i.e. evaluation factor u 2 Membership vector R of (2) 2 ＝{0.6,0.4,0}；
Will u 3 =40.4 substitution into membership function C 1 、C 2 、C 3 X in (b) is calculated as C 1 (x)＝0.32，C 2 (x)＝0.68，C 3 (x) =0, i.e. evaluation factor u 3 Membership vector R of (2) 3 ＝{0.32,0.68,0}
The single factor membership vector R obtained by the calculation 1 ，R 2 ，R 3 For the rows, form a fuzzy comprehensive evaluation matrix R of 3 rows and 3 columns 3*3
Taking q= {0.35,0.35,0.3}, then calculating the comprehensive evaluation matrix S:
taking the maximum value element S of the calculation result S 1 =0.656, give comment v 1 Good.
Example 3
A certain period of time in the production process, the time period T=5min, and the measurement data T is obtained 1 ＝2890℃，t 2 ＝2877℃，w 1 ＝16.2Kg，w 2 ＝15.4Kg，p 1 ＝865Pa，p 2 =1330 Pa; calculated from the above data:
will u 1 =2.6 substitution into membership function a 1 、A 2 、A 3 X in (a) is respectively obtained as A 1 (x)＝0，A 2 (x)＝0.4，A 3 (x) =0.6, i.e. evaluation factor u 1 Membership vector R of (2) 1 ＝{0,0.4,0.6}；
Will u 2 =4.9 substitution into membership function B 1 、B 2 、B 3 X in (B) is obtained 1 (x)＝0，B 2 (x)＝0.55，B 3 (x) =0.45, i.e. evaluation factor u 2 Membership vector R of (2) 2 ＝{0,0.55,0.45}；
Will u 3 =93 substitution into membership function C 1 、C 2 、C 3 X in (b) is calculated as C 1 (x)＝0，C 2 (x)＝0.175，C 3 (x) =0.825, i.e. evaluation factor u 3 Membership vector R of (2) 3 ＝{0,0.175,0.825}
The single factor membership vector R obtained by the calculation 1 ，R 2 ，R 3 Fuzzy comprehensive evaluation moment for forming 3 rows and 3 columnsArray R 3*3
Taking q= {0.35,0.35,0.3}, then calculating the comprehensive evaluation matrix S:
taking the maximum value element S of the calculation result S 3 =0.615, give comment v 3 'bad' and alarm prompt.
According to the technical scheme provided by the application, based on the temperature and pressure of the furnace cavity of the continuous graphitization and purification furnace, the weight of materials entering the continuous graphitization and purification furnace is detected, the weight of materials discharged from the continuous graphitization and purification furnace is detected, the judgment of the operation condition of the materials in the furnace is realized, the alarm prompt is carried out on the condition that the continuous graphitization and purification furnace generates unsmooth material circulation, the production risks of overtemperature of the materials, out-of-control of heat balance in the furnace and the like are prevented and reduced, and the product quality is improved.
The present application is not limited to the above preferred embodiments, but various changes and modifications can be made within the spirit of the present application as defined in the appended claims and description, and the same technical problems can be solved and the intended technical effects can be obtained, so that it is not repeated. All modifications which may occur to those skilled in the art from the present disclosure are intended to be included within the scope of the application as defined in the appended claims.

Claims (2)

1. A method for determining the stability of a material in a continuous graphitization and purification furnace, comprising the steps of:
the infrared temperature measuring device detects the temperatures of a plurality of measuring points in the continuous graphitization and purification furnace in real time and transmits the temperatures to the PLC in real time;
the weighing device measures the weight of the materials entering the continuous graphitizing and purifying furnace in real time, measures the weight of the materials discharged from the continuous graphitizing and purifying furnace in real time, and transmits the weight to the PLC in real time;
the pressure sensor detects the air pressure in the continuous graphitizing and purifying furnace in real time and transmits the air pressure to the PLC in real time;
the PLC comprehensively judges the stability of materials in the continuous graphitization and purification furnace according to three evaluation factors of the temperature change rate, the weight deviation rate and the pressure change rate in the continuous graphitization and purification furnace, wherein the judging process is as follows:
firstly, establishing an evaluation factor set U for comprehensively evaluating the stability of materials, wherein the evaluation factors comprise:
1) Rate of change of temperature u 1 When the continuous graphitization and purification furnace is heated to the target temperature required by the process, the smaller the temperature change rate is, the better the stability of the materials in the furnace is,
the PLC calculates the temperature change rate u according to the following formula 1
Wherein t is 1 Average temperature value in DEG C detected for each measurement point at the beginning of a time period
t 2 For the average temperature value detected at each measuring point at the end of the time period, in DEG C
T is a time period, unit min;
2) Weight deviation ratio u 2 The weight deviation rate is maintained at a smaller value, which indicates that the stability of the materials in the continuous graphitization and purification furnace is better,
the PLC calculates the weight deviation ratio u according to the following formula 2
Wherein w is 1 For inputting the accumulated weight of the materials in the continuous graphitization and purification furnace in the time period, the unit Kg
w 2 For discharging material from continuous graphitization and purification furnace during time periodAccumulating weight, unit Kg;
3) Rate of change of pressure u 3 The smaller the pressure change rate is, the better the material stability is, the air pressure in the furnace is in a dynamic balance state,
the PLC calculates the pressure change rate u according to the following formula 3
Wherein p is 1 For continuous graphitization at the beginning of the time period, the unit Pa is the detected value of the air pressure in the purifying furnace
p 2 For continuous graphitization at the end of the time period, the unit Pa is the detected value of the air pressure in the purifying furnace
T is a time period, unit min;
from this, the evaluation factor set u= { U 1 ,u 2 ,u 3 "u 1 ,u 2 ,u 3 Corresponding to a specific working condition;
(II) setting a comment set V= { V of each factor 1 ,v 2 ,v 3 The method comprises the steps of (1) setting a membership function of each evaluation factor to a comment set V, wherein the membership function is used for representing the degree of coincidence of a single factor to comments, and the maximum value of the membership function is 1, and the minimum value of the membership function is 0;
(III) calculating a fuzzy comprehensive evaluation matrix R
Evaluation factor u 1 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 1 For comment v 2 The membership function of (2) is as follows:
evaluation factorElement u 1 For comment v 3 The membership function of (2) is as follows:
will u 1 Respectively substituting the values of (a) into the membership function A 1 、A 2 、A 3 X in (2), the evaluation factor u can be obtained 1 Membership vector R of (2) 1 ＝{r 11 ,r 12 ,r 13 }；
Evaluation factor u 2 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 2 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 2 For comment v 3 The membership function of (2) is as follows:
will u 2 Respectively substituting the values of (a) into the membership function B 1 、B 2 、B 3 X in (2), the evaluation factor u can be obtained 2 Membership vector R of (2) 2 ＝{r 21 ,r 22 ,r 23 }；
Evaluation factor u 3 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 3 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 3 For comment v 3 The membership function of (2) is as follows:
will u 3 Respectively substituting the values of (2) into membership function C 1 、C 2 、C 3 X in (2), the evaluation factor u can be obtained 3 Membership vector R of (2) 3 ＝{r 31 ,r 32 ,r 33 }；
The single factor membership vector R obtained by the calculation 1 ，R 2 ，R 3 For the rows, form a fuzzy comprehensive evaluation matrix R of 3 rows and 3 columns 3*3 ；
(IV) determining an evaluation factor weight vector Q= { Q 1 ,q 2 ,q 3 }, where q 1 ,q 2 ,q 3 Representing 3 evaluation factors u 1 ,u 2 ,u 3 And q 1 +q 2 +q 3 ＝1；
(fifth) calculating the comprehensive evaluation result S, calculating s=qr= { S using matrix multiplication 1 ,s 2 ,s 3 (s is therein 1 ,s 2 ,s 3 Represents the current evaluation factor set u= { U 1 ,u 2 ,u 3 For each element V of comment set V 1 ,v 2 ,v 3 Membership degree of s is taken as 1 ,s 2 ,s 3 The maximum value of the components can be obtained comprehensive comments of the current working conditions; if s 1 Maximum, give comment v 1 "good"; if s 2 Maximum, give comment v 2 If "pass" s 3 Maximum, give comment v 3 'bad' and alarm prompt.
2. A system for judging the stability of materials in a continuous graphitization and purification furnace comprises an infrared temperature measuring device, a weighing device and a pressure sensor, and a PLC electrically connected with the infrared temperature measuring device, the weighing device and the pressure sensor; the infrared temperature measuring device is used for collecting temperatures of a plurality of measuring points in the continuous graphitizing and purifying furnace in real time and transmitting the temperatures to the PLC in real time;
the weighing device is used for measuring the weight of the materials entering the continuous graphitizing and purifying furnace in real time, measuring the weight of the materials discharged from the continuous graphitizing and purifying furnace in real time and transmitting the weight to the PLC in real time;
the pressure sensor is used for measuring the air pressure in the continuous graphitization and purification furnace in real time and transmitting the air pressure to the PLC in real time;
the PLC comprehensively judges the stability of materials in the continuous graphitization and purification furnace according to three evaluation factors including the temperature change rate, the weight deviation rate and the pressure change rate in the continuous graphitization and purification furnace, wherein the judging process is as follows:
firstly, establishing an evaluation factor set U for comprehensively evaluating the stability of materials, wherein the evaluation factors comprise:
1) Rate of change of temperature u 1 When the continuous graphitization and purification furnace is heated to the target temperature required by the process, the smaller the temperature change rate is, the better the stability of the materials in the furnace is,
the PLC calculates the temperature change rate u according to the following formula 1
Wherein t is 1 Average temperature value in DEG C detected for each measurement point at the beginning of a time period
t 2 For the average temperature value detected at each measuring point at the end of the time period, in DEG C
T is a time period, unit min;
2) Weight deviation ratio u 2 The weight deviation rate is maintained at a smaller value, which indicates that the stability of the materials in the continuous graphitization and purification furnace is better,
the PLC calculates the weight deviation ratio u according to the following formula 2
Wherein w is 1 For inputting the accumulated weight of the materials in the continuous graphitization and purification furnace in the time period, the unit Kg
w 2 The unit Kg is the accumulated weight of the materials output from the continuous graphitization and purification furnace in the time period;
3) Rate of change of pressure u 3 The smaller the pressure change rate is, the better the material stability is, the air pressure in the furnace is in a dynamic balance state,
the PLC calculates the pressure change rate u according to the following formula 3
Wherein p is 1 For continuous graphitization at the beginning of the time period, the unit Pa is the detected value of the air pressure in the purifying furnace
p 2 For continuous graphitization at the end of the time period, the unit Pa is the detected value of the air pressure in the purifying furnace
T is a time period, unit min;
from this, the evaluation factor set u= { U 1 ,u 2 ,u 3 "u 1 ,u 2 ,u 3 Corresponding to a specific working condition;
(II) setting a comment set V= { V of each factor 1 ,v 2 ,v 3 The } = { good, qualified, bad }, and each evaluation factor is set for the comment setThe membership degree of V is used for representing the coincidence degree of a single factor to the comment, the maximum value of the membership degree is 1, and the minimum value of the membership degree is 0;
(III) calculating a fuzzy comprehensive evaluation matrix R
Evaluation factor u 1 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 1 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 1 For comment v 3 The membership function of (2) is as follows:
will u 1 Respectively substituting the values of (a) into the membership function A 1 、A 2 、A 3 X in (2), the evaluation factor u can be obtained 1 Membership vector R of (2) 1 ＝{r 11 ,r 12 ,r 13 }；
Evaluation factor u 2 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 2 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 2 For comment v 3 The membership function of (2) is as follows:
will u 2 Respectively substituting the values of (a) into the membership function B 1 、B 2 、B 3 X in (2), the evaluation factor u can be obtained 2 Membership vector R of (2) 2 ＝{r 21 ,r 22 ,r 23 }；
Evaluation factor u 3 For comment v 1 The membership function of (2) is as follows:
evaluation factor u 3 For comment v 2 The membership function of (2) is as follows:
evaluation factor u 3 For comment v 3 The membership function of (2) is as follows:
will u 3 Respectively substituting the values of (2) into membership function C 1 、C 2 、C 3 X in (2), the evaluation factor u can be obtained 3 Membership vector R of (2) 3 ＝{r 31 ,r 32 ,r 33 }；
The single factor membership vector R obtained by the calculation 1 ，R 2 ，R 3 For the rows, form a fuzzy comprehensive evaluation matrix R of 3 rows and 3 columns 3*3 ；
(IV) determining an evaluation factor weight vector Q= { Q 1 ,q 2 ,q 3 }, where q 1 ,q 2 ,q 3 Representing 3 evaluation factors u 1 ,u 2 ,u 3 And q 1 +q 2 +q 3 ＝1；
(fifth) calculating the comprehensive evaluation result S, calculating s=qr= { S using matrix multiplication 1 ,s 2 ,s 3 (s is therein 1 ,s 2 ,s 3 Represents the current evaluation factor set u= { U 1 ,u 2 ,u 3 For each element V of comment set V 1 ,v 2 ,v 3 Membership degree of s is taken as 1 ,s 2 ,s 3 The maximum value of the components can be obtained comprehensive comments of the current working conditions; if s 1 Maximum, give comment v 1 "good"; if s 2 Maximum, give comment v 2 If "pass" s 3 Maximum, give comment v 3 'bad' and alarm prompt.
CN202310375551.5A 2023-04-10 2023-04-10 System and method for judging stability of materials in continuous graphitization and purification furnace Pending CN116659251A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310375551.5A CN116659251A (en) 2023-04-10 2023-04-10 System and method for judging stability of materials in continuous graphitization and purification furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310375551.5A CN116659251A (en) 2023-04-10 2023-04-10 System and method for judging stability of materials in continuous graphitization and purification furnace

Publications (1)

Publication Number Publication Date
CN116659251A true CN116659251A (en) 2023-08-29

Family

ID=87726788

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310375551.5A Pending CN116659251A (en) 2023-04-10 2023-04-10 System and method for judging stability of materials in continuous graphitization and purification furnace

Country Status (1)

Country Link
CN (1) CN116659251A (en)

Similar Documents

Publication Publication Date Title
CN114471418B (en) Method, system and medium for controlling temperature in continuous granulation reaction kettle
CN104894362A (en) Method for setting temperature of heating furnace in cold and hot steel billet mixed loading
CN109542003B (en) Automatic control method for polycrystalline silicon reduction furnace
CN116659251A (en) System and method for judging stability of materials in continuous graphitization and purification furnace
CN110129496B (en) Method for judging bonding state of blast furnace wall
CN116839681B (en) Multi-sensor-based asphalt stirring equipment monitoring method and system
CN103205537A (en) Continuous measuring method for molten steel temperature during LF (ladle furnace) finery production procedure
CN109251751A (en) A kind of coke oven fire falls monitoring system
CN108483440A (en) A kind of nuclear graphite powder purifying process
CN106282533A (en) A kind of temperature-controlled process to be rolled of heating furnace
CN207439980U (en) A kind of new carbon-based solid waste low temperature pyrogenation experimental provision
CN104075827B (en) Method for accurately measuring temperature of reduction furnace
CN110377069B (en) Furnace gas outlet temperature control method based on material layer thickness of yellow phosphorus electric furnace
CN109471405A (en) Device is transformed in annealing furnace heating tube current monitoring
CN109668326A (en) A kind of instant heating type dynamic temperature control method based on pid algorithm
CN113155072B (en) On-line detection method for thickness of ring forming material of pellet rotary kiln
CN203443686U (en) Temperature alarm device controlled based on single chip microcomputer
CN105404146B (en) A kind of furnace of calcium carbide working of a furnace diagnostic method and system
CN109491421B (en) Temperature control method of intelligent temperature control system based on metallurgical secondary resource recycling
CN108375310B (en) A kind of vacuum furnace beacon flint control method
CN201362593Y (en) Continuous vertical type medium-frequency high-temperature and high-purity graphite producing device
CN108507353A (en) The material thickness adjusting method of belt pellet roasting machine
CN203411586U (en) Thermal load balance prewarning device for radiant tubes of continuous annealing furnace
TWI450969B (en) Method for estimating termperature of iron water of a blast furnace
CN219347385U (en) Electric control early warning device of aluminum bar heating furnace

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination