CN111270028B - Coping method and coping system for converting dry quenching into wet quenching of blast furnace - Google Patents
Coping method and coping system for converting dry quenching into wet quenching of blast furnace Download PDFInfo
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- 238000010791 quenching Methods 0.000 title claims abstract description 394
- 230000000171 quenching effect Effects 0.000 title claims abstract description 390
- 230000010485 coping Effects 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000000571 coke Substances 0.000 claims abstract description 91
- 238000012512 characterization method Methods 0.000 claims abstract description 87
- 238000004519 manufacturing process Methods 0.000 claims description 91
- 239000000446 fuel Substances 0.000 claims description 27
- 230000006872 improvement Effects 0.000 claims description 16
- 230000008859 change Effects 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 7
- 230000006866 deterioration Effects 0.000 claims description 6
- 238000009411 base construction Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000002596 correlated effect Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 claims 1
- 238000002372 labelling Methods 0.000 claims 1
- 230000009471 action Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
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- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
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Abstract
The invention provides a coping method and coping system for transferring dry quenching to wet quenching of a blast furnace. The coping method comprises the following steps: constructing a case library for transferring dry quenching coke to wet quenching coke; comparing the furnace condition characterization parameters of each case in the wet quenching period with the furnace condition characterization parameters of each case in the dry quenching period, and judging the quality of the coping strategies of the case; determining furnace condition characterization parameter standards of the optimal time for dry quenching to wet quenching, and constructing an optimal time case library, wherein the furnace condition characterization parameters of each case in the dry quenching period are matched with the furnace condition characterization parameter standards; generating a prompt suitable for dry quenching to wet quenching when the current furnace condition characterization parameters are matched with the standard of the furnace condition characterization parameters; and comparing the current operating parameters, furnace body data and furnace charge data with each case with good quality of coping strategies in the case library at the optimal time, and generating the coping strategy for converting dry quenching into wet quenching by referring to the operating parameters of the wet quenching stage of the case with larger matching degree.
Description
Technical Field
The invention belongs to the technical field of smelting blast furnace control, and relates to a coping method and coping system for converting dry quenching into wet quenching of a blast furnace.
Background
As is well known, coke is both a fuel and a reducing agent in the blast furnace ironmaking process and also a skeleton of the blast furnace. Coke quality is a key factor affecting the steady-state operation of blast furnaces, especially large blast furnaces. Compared with wet quenching, dry quenching has obvious advantages in the aspects of moisture, average particle size, cold strength, hot strength and the like, so that dry quenching is commonly adopted in large-scale blast furnace production. However, during the annual repair of dry quenching production systems, it is common practice to replace and use wet quenching systems for large blast furnace production, which often results in large furnace condition fluctuations for the blast furnace.
On this basis, it is particularly important by what counter measures to maintain stable operation of the blast furnace during the changeover between dry quenching and wet quenching, and during the use of wet quenching.
In the prior art, in the replacement conversion process of dry quenching and wet quenching and during the use of wet quenching, operators often adopt a trial-and-error method to carry out various adjustments of blast furnace operation based on own operation experience. However, this method has a low accuracy and a great chance of coping with the effect, and not only is there a high possibility of causing further fluctuation in the blast furnace condition, but also there is a possibility of missing the optimum adjustment timing of the blast furnace.
Disclosure of Invention
In order to solve the problem that the operation adjustment of a blast furnace is performed by depending on the experience of an operator too much when wet quenching is adopted to replace dry quenching in the prior art, the invention aims to provide a coping method and a coping system for transferring dry quenching to wet quenching of the blast furnace.
In order to achieve one of the above objects, an embodiment of the present invention provides a method for handling dry quenching to wet quenching of a blast furnace, comprising the steps of:
constructing a case library for transferring dry quenching coke to wet quenching coke in a production history, wherein each case has production data of a wet quenching coke period and production data of a dry quenching coke period before the wet quenching coke period, and the production data comprises operation parameters, furnace body data, furnace burden data and furnace condition characterization parameters;
comparing the furnace condition characterization parameters of each case in the wet quenching period with the furnace condition characterization parameters of each case in the dry quenching period, and judging the quality of the coping strategies of the case;
determining furnace condition characterization parameter standards of the optimal time for dry quenching to wet quenching, and constructing an optimal time case library, wherein the furnace condition characterization parameters of each case in the dry quenching period are matched with the furnace condition characterization parameter standards;
acquiring a current furnace condition characterization parameter, and generating a prompt suitable for dry quenching to wet quenching when the current furnace condition characterization parameter is matched with a furnace condition characterization parameter standard;
and comparing the current operating parameters, furnace body data and furnace charge data with each case with good quality of coping strategies in the case library at the optimal time, screening out the cases with larger matching degree, and generating the coping strategy for converting the dry quenching into the wet quenching by referring to the operating parameters of the screened cases in the wet quenching period.
As a further improvement of one embodiment of the invention, the step of building a case library for dry quenching to wet quenching in the production history comprises the following steps:
the method comprises the steps of obtaining production data and time information of the production data in production history, and storing the production data and the time information of the production data in a database, wherein the production data comprise operation parameters, furnace body data, furnace burden data and furnace condition representation parameters, and the furnace burden data comprise coke information;
generating a case base construction instruction, wherein the case base construction instruction comprises an initial time, a termination time and a unit period;
extracting production data between the starting time and the ending time from a database in unit period, and marking the coke in each unit period as wet quenching coke or dry quenching coke by comparing the production data with a coke sample;
and constructing a case library according to the marking result, wherein each case wet quenching period consists of a plurality of continuous unit periods marked with wet quenching, and the dry quenching period consists of a plurality of continuous unit periods marked with dry quenching before the wet quenching period.
As a further improvement of an embodiment of the invention, the step "mark coke per unit cycle as wet quenched or dry quenched by comparison with a coke sample" marks coke as wet quenched or dry quenched by comparison with a coke sample when the moisture content of the coke per unit cycle matches the wet quenched sample standard, otherwise marks coke as dry quenched.
As a further improvement of one embodiment of the invention, the step of comparing the furnace condition characterization parameters of each case in the wet quenching period with the furnace condition characterization parameters of the case in the dry quenching period to judge the quality of the coping strategies of the case comprises the following steps:
comparing the furnace condition characterization parameters of the case in the wet quenching period with the furnace condition characterization parameters of the case in the dry quenching period;
if the comparison result meets the first comparison judgment standard, judging that the coping strategy quality of the case is good and the coping strategy quality is the optimal grade;
if the comparison result meets the second comparison and judgment standard, judging that the coping strategy of the case has good quality and is in a qualified grade;
if the comparison result meets the third comparison judgment standard, judging that the coping strategy quality of the case is poor;
the method comprises the following steps of comparing current operating parameters, furnace body data and furnace charge data with each case with good coping strategy quality in a case library at the optimal time to screen out the case with larger matching degree:
comparing the current operating parameters, furnace body data and furnace burden data with each case with good coping strategy quality in the case library at the optimal time;
screening out a plurality of alternative cases with the matching degree larger than a set standard;
and selecting a reference case from the plurality of alternative cases according to the optimal grade and the qualified grade of the quality of the coping strategy.
As a further improvement of an embodiment of the present invention, the step of "comparing the furnace condition characterization parameters of the case in the wet quenching period with the furnace condition characterization parameters of the case in the dry quenching period" is: average value of yield per unit time of wet quenching period P of case2Fuel ratio per unit time average value R2And its dry quenching periodAverage value of production per unit time P1Fuel ratio per unit time average value R1Respectively comparing;
the first comparison criterion is P2-P1＞P0And R is2-R1＜R0In which P is0As a standard of variation of the mean value of the production per unit time, R0Is a fuel ratio average value change standard per unit time;
the second comparison criterion is P2-P1＞P0And R is2-R1≥R0；
The third comparison criterion comprises P2-P1≤P0And R is2-R1＜R0、P2-P1≤P0And R is2-R1≥R0Wherein, if P2-P1≤P0And R is2-R1＜R0Judging that the coping strategy of the case is poor in quality and unqualified; if P2-P1≤P0And R is2-R1≥R0And judging that the coping strategy quality of the case is poor and is in an alert level.
As a further improvement of an embodiment of the present invention, the step of "determining furnace condition characterization parameter standards possessed by the preferred time for dry quenching coke to wet quenching coke, and constructing a preferred time case library" includes the steps of:
dividing the case base into a plurality of case groups according to different furnace condition characterization parameters of each case in the dry quenching period in the case base;
counting the proportion of cases with good quality of coping strategies in each case group;
and determining furnace condition characterization parameter standards of the preferred time for dry quenching to wet quenching based on the case group with the largest proportion, and constructing the case group as a preferred time case library.
As a further improvement of an embodiment of the present invention, the step of "dividing the case base into a plurality of case groups according to different furnace condition characterization parameters of the coke dry quenching period of each case in the case base" is:
maximum value of production per unit time P of dry quenching period of current casemaxAnd maximum value of production per unit time PminWhen the difference value of the case is not more than the standard delta P of the yield difference in unit time, dividing the case into a forward-going period case group;
when the yield P per unit time of the cases in the dry quenching period is in the increasing trend, dividing the cases into an improvement period case group;
when the yield per unit time P of the case in the dry quenching period is in a descending trend, dividing the case into a deterioration period case group.
As a further improvement of an embodiment of the present invention, the step "referring to the operation parameters of the screened cases in the wet quenching period, and generating a coping strategy for converting dry quenching into wet quenching" is: and analyzing the correlated change of the operation parameters of the wet quenching period and the furnace condition characterization parameters of the case along with time, and generating a coping strategy for converting dry quenching into wet quenching according to the analysis result.
As a further improvement of one embodiment of the invention, the operation parameters comprise a material distribution system parameter, a lower regulating system parameter, a cooling system parameter and a slagging system parameter.
In order to achieve one of the above objects, an embodiment of the present invention provides a system for handling dry quenching and wet quenching of a blast furnace, including a memory and a processor, where the memory stores a computer program operable on the processor, and the processor executes the computer program to implement the steps in the handling method
Compared with the prior art, the invention has the beneficial effects that: by comparing the current furnace condition characterization parameters with the furnace condition characterization parameter standards, the optimal time for dry quenching to wet quenching can be accurately grasped, so that the production action of dry quenching to wet quenching is prevented from being started blindly, and severe fluctuation of the furnace condition caused by dry quenching to wet quenching at wrong time is further prevented; moreover, cases with good strategy quality are screened from the case library at the optimal time for reference, so that the accuracy of the current strategy for converting dry quenching coke into wet quenching coke is improved, a better response effect is ensured, severe fluctuation of furnace conditions caused by converting dry quenching coke into wet quenching coke is avoided, and the fluctuation resistance of the furnace conditions is improved; moreover, the referenced case is closest to the current situation in the aspects of operation parameters, furnace body data and furnace charge data, so that the quality of a coping strategy for converting dry quenching coke into wet quenching coke is ensured, and the current operation parameters and the like can be changed as little as possible.
Drawings
Fig. 1 is a flowchart of a method for handling dry quenching to wet quenching in a blast furnace according to an embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
Referring to fig. 1, a responding method for converting dry quenching into wet quenching of a blast furnace according to an embodiment of the invention is provided, which can be applied to a situation that dry quenching is converted into wet quenching in a production process of the blast furnace, and gives a preferable time and a responding strategy to improve the stability of the furnace condition of the blast furnace. Specifically, the coping method includes the following steps.
The method comprises the following steps: and (5) constructing a case library for transferring dry quenching coke to wet quenching coke in the production history.
Each case in the case base was tuned from primary blast furnace production using dry quenching to wet quenching. In a preferred embodiment, all cases in the case base occur in the same blast furnace and are selected from the production history of the blast furnace since the blast furnace is opened, and the coping strategies obtained based on the coping methods are also based on the current production requirement of the blast furnace for transferring from dry quenching to wet quenching, that is, the adjusting time and coping strategies are determined by the coping methods based on the cases in the production history of the blast furnace for transferring from dry quenching to wet quenching. Of course, in a variant embodiment, each case may also occur in different blast furnaces, that is, for a blast furnace which needs to be switched from dry quenching to wet quenching at present, the adjustment timing and the coping strategy may also be determined by the coping method based on cases in the production history of other blast furnaces.
Further, each case has production data for its wet quench period, and also includes production data for a dry quench period prior to its wet quench period. For the same case, the dry quenching period and the wet quenching period form a production stage with continuous and coherent time, the dry quenching period is also a production stage using dry quenching, and the wet quenching period is also a production stage using wet quenching.
Preferably, the step of 'constructing a case library for dry quenching and wet quenching in production history' comprises the steps of: and acquiring production data in the production history and time information of the production data, and storing the production data and the time information in a database.
The production data of the whole production history of the blast furnace from the blow-in process and the time information of the production data can be obtained, the production data and the time information are stored in the database, and the time chain database can be constructed for later use.
The production data comprise operation parameters, furnace body data, furnace burden data and furnace condition characterization parameters. In detail, the operation parameters comprise a material distribution system parameter, a lower regulation system parameter, a cooling system parameter, a slagging system parameter and the like; the furnace condition characterization parameters comprise furnace top gas temperature, furnace top gas components, blanking speed, charge level data, furnace hearth central point temperature, residual slag quantity of the furnace hearth, fuel ratio, yield and the like.
The production data may be based on human input to be obtained, such as the operating parameters; may also be acquired based on automatic sensing, such as the furnace condition characterizing parameter; it may also be acquired based in part on human entry and in part on automatic sensing.
Preferably, the step of "building a case library for dry quenching and wet quenching in production history" further comprises the steps of: and generating case base construction instructions.
Based on the generation of the case library construction instruction, the case library for dry quenching to wet quenching can be started to be constructed. The case base building instruction comprises a starting time, an ending time and a unit period.
Preferably, the step of "building a case library for dry quenching and wet quenching in production history" further comprises the steps of: and extracting the production data between the starting time and the ending time from the database in a unit period.
Namely, according to the case library construction instruction, the production data meeting the target requirement is called from the database. For example, if the starting time is 0 o 'clock in 1 month and 1 day of 2018, the ending time is 24 o' clock in 6 months and 30 days of 2019, and the unit period is 1 day, then in this step, production data of 0 o 'clock in 1 month and 1 day of 2018 to 24 o' clock in 6 months and 30 days of 2019 are extracted from the database with 1 day as the minimum time length, and the production data of every 1 day constitutes a minimum data packet.
Of course, the starting time, the ending time and the unit period may be any values meeting requirements, the above examples are only for convenience of understanding and explanation and do not constitute specific limitations thereof, the ending time is preferably set as the current time, and the length of the time period from the starting time to the ending time is preferably set as an integer multiple of the unit period.
Preferably, the step of "building a case library for dry quenching and wet quenching in production history" further comprises the steps of: the coke per unit cycle is labeled as either wet or dry quenched by comparison to a sample of coke.
Specifically, the coke in each unit cycle is compared with a coke sample, and based on the comparison result, whether the coke in the unit cycle is wet quenched or dry quenched is determined.
In a preferred embodiment, the moisture content w of the coke per unit period is compared to the moisture content of a sample of coke; when the moisture content w matches the wet quenched sample criteria, the wet quenched sample criteria may be, for example, a moisture content greater than w0I.e. when w > w0Then, the coke of the unit period is marked as wet quenching coke; otherwise, i.e. w ≦ w0Or moisture content w, is matched to a dry-quenched sample standard, the coke per unit cycle is marked as dry-quenched.
In this step, the cokes of each unit cycle are marked, and preferably, the production data are extracted one by one in the database from the start time in the unit cycle, and each time the production data of one unit cycle is extracted, the cokes of the unit cycle are marked until the marking of one unit cycle of the coke at the end time is completed. For example, also for the aforementioned start time of 0 o ' clock in 1/2018, the end time of 24 o ' clock in 6/30/2019, and the unit cycle of 1 day, the production data from 0 o ' clock in 1/2018 and 24 o ' clock in 2018 are extracted and the coke type is marked (i.e., wet quenching or dry quenching), the production data from 0 o ' clock in 2/1/2018 and 24 o ' clock in 2018 are extracted and the coke type is marked, and this continues until the production data from 0 o ' clock in 0 o ' clock to 24 o ' clock in 6/month 30 and 2019 are extracted and the coke type is marked finally.
Preferably, the step of "building a case library for dry quenching and wet quenching in production history" further comprises the steps of: and constructing a case base according to the marking result.
Specifically, each case in the case library has a wet quenching phase consisting of a number of consecutive unit cycles marked with wet quenching and a dry quenching phase consisting of a number of unit cycles marked with dry quenching that are consecutive before the wet quenching phase, i.e., as described above, each case has a dry quenching phase, i.e., a production phase using dry quenching, and a wet quenching phase, i.e., a production phase using wet quenching, which are continuously consecutive in time. Or selecting a plurality of unit periods which are continuous in phase and are marked as wet quenching as a wet quenching period of a case, and selecting a plurality of unit periods which are continuous in phase and are positioned before the wet quenching period and are marked as dry quenching as a dry quenching period of the case, thereby constructing a complete case.
For example, coke in 31 days from 0 o ' clock in 1 month and 1 st in 2018 to 24 o ' clock in 1 month and 31 month in 2018 is respectively marked as dry quenching, coke in 10 days from 0 o ' clock in 2 months and 1 st in 2018 to 24 o ' clock in 2 months and 10 th in 2018 is respectively marked as wet quenching, coke in a plurality of days after 11 o ' clock in 2 months and 11 th in 2018 is respectively marked as dry quenching, according to actual implementation requirements, 20 days from 0 o ' clock in 21 months and 1 st in 2018 to 24 o ' clock in 2 months and 10 days from 0 o ' clock in 1 month and 21 st in 2018 to 24 o ' clock in 2 months and 10 days from 0 o ' clock in 1 month and 1 st in 2018 to 24 o ' clock in 10 months and 2 nd in 24 o ' clock in 2018 are respectively marked as dry quenching, and 10 days from 0 o ' clock in 1 month and 1 st in 2018 are respectively marked as wet quenching periods of the case.
In the case of dry quenching and wet quenching as above, the number of unit cycles included in the dry quenching period and the number of unit cycles included in the wet quenching period are exemplified to be the same, and are 10 days, which is merely for convenience of understanding and explanation and does not constitute a specific limitation thereto, and the number of unit cycles included in the dry quenching period and the number of unit cycles included in the wet quenching period of one case may be set to be different.
All cases in the case base can be constructed one by one as above, and the collection of cases is the so-called case base.
In the following, taking the production history of a blast furnace a as an example, the case library of dry quenching to wet quenching constructed based on the step is exemplified by the following table, in which: the time, days for the 12 cases of dry coke quenching to wet coke quenching in the blast furnace a production history are illustrated in table 1; tables 2 to 5 respectively illustrate the furnace charge data, furnace body data, operation parameters and furnace condition characterization parameters of the blast furnace A in the dry quenching period of the 12 cases; tables 6 to 9 illustrate charge data, furnace data, operating parameters, furnace condition characterizing parameters, respectively, for the aforementioned 12 cases of the blast furnace a during the wet quenching.
[ Table 1]
[ Table 2]
[ Table 3]
[ Table 4]
[ Table 5]
[ Table 6]
[ Table 7]
[ Table 8]
[ Table 9]
The method comprises the following steps: and comparing the furnace condition characterization parameters of each case in the wet quenching period with the furnace condition characterization parameters of each case in the dry quenching period, and judging the quality of the coping strategies of the case.
The furnace condition characterization parameters can characterize the operating state of the blast furnace, and the furnace condition characterization parameters of the wet quenching period and the dry quenching period of each case are compared, so that the operating state change of the blast furnace before and after dry quenching and wet quenching can be determined, and the coping strategy quality of the case can be judged, for example, whether the coping strategy quality of the case is good or poor can be judged.
Further, the step of comparing the furnace condition characterization parameters of each case in the wet quenching period with the furnace condition characterization parameters of each case in the dry quenching period to judge the quality of the coping strategies of the case comprises the following steps:
comparing the furnace condition characterization parameters of the case in the wet quenching period with the furnace condition characterization parameters of the case in the dry quenching period;
if the comparison result meets the first comparison judgment standard, judging that the coping strategy quality of the case is good and the coping strategy quality is the optimal grade;
if the comparison result meets the second comparison and judgment standard, judging that the coping strategy of the case has good quality and is in a qualified grade;
and if the comparison result meets the third comparison and judgment standard, judging that the coping strategy quality of the case is poor.
That is, by comparing the furnace condition characterization parameters of the case in the wet quenching period with the furnace condition characterization parameters of the case in the dry quenching period, and according to the comparison result, not only can the quality of the coping strategies of the case be judged to be good or poor, but also at least the case with good coping strategies can be classified into an optimal grade and a qualified grade. It will be appreciated that the best-rated cases are better in coping with the policy quality than the qualified-rated cases.
In the step of comparing the furnace condition characterization parameters of the case in the wet quenching period with the furnace condition characterization parameters of the case in the dry quenching period, the furnace condition characterization parameters can be any parameter item capable of characterizing the running state of the blast furnace according to actual needs, and the average value P of the yield per unit time and the average value R of the fuel ratio per unit time are selected in the preferred embodiment.
Specifically, in the preferred embodiment, the step of "comparing the furnace condition characterization parameters of the case in the wet quenching period with the furnace condition characterization parameters of the case in the dry quenching period" is: average value of yield per unit time of wet quenching period P of case2Fuel ratio per unit time average value R2With its average value of the yield per unit time in the dry quenching period P1Fuel ratio per unit time average value R1The comparison was performed separately. That is, the average value P of the yield per unit time of the wet quenching period of the case2With its average value of the yield per unit time in the dry quenching period P1The comparison was made, and the unit time fuel ratio average value R of the wet quenching period of the case was compared2With its mean value of fuel ratio per unit time in the dry quenching period R1And (6) carrying out comparison.
Wherein the average value P of the yield per unit time of the wet quenching period2Means the sum of the yields of the wet quenching period divided by the number of the wet quenching period per unit time, the average value P of the yields per unit time of the dry quenching period1Refers to the sum of the yields of the dry quenching period divided by the number of units of time of the dry quenching period. Similarly, the mean fuel ratio per unit time R of the wet quenching period2Means the sum of the fuel ratios of the wet quenching period divided by the number of wet quenching period per unit time, and the fuel ratio average value R of the dry quenching period per unit time1Refers to the sum of the fuel ratios of the dry quenching period divided by the number of dry quenching periods per unit time.
The unit time can be selected according to actual needs, for example, the selected value is 1 hour, 8 hours, 1 day, 2 days, etc., ideally, each wet quenching period has a plurality of unit times, each dry quenching period also has a plurality of unit times, and the unit time is equal to the unit period. Of course, the unit time may not be equal to the unit period, and each wet quenching period or each dry quenching period may have one or two unit times.
E.g. unit of time and unitThe cycle is one day, an exemplary case of wet quenching period is from 0 point at 1 month 1 of 2018 to 24 points at 2 month 10 of 2018, and the sum of the yields of the wet quenching periods of 10 days is P2-0The fuel ratio being summed to R2-0Average value P of the yield per unit time of the wet quenching period2＝P2-010 in tons, fuel ratio average R per unit time2＝R2-010, unit is kg/ton; the exemplary case had a dry quenching period of 0 o 'clock at 21/1/2018 to 24 o' clock at 31/1/2018, with a total throughput of P for the 10-day dry quenching period1-0The fuel ratio being summed to R1-0Average value of yield per unit time P of dry quenching1＝P1-010 in tons, fuel ratio average R per unit time1＝R1-0And/10, unit is kilogram/ton.
Further, the first comparison criterion is P2-P1＞P0And R is2-R1＜R0In which P is0As a standard of variation of the mean value of the production per unit time, R0Is the standard of the change of the average value of the fuel ratio in unit time. Correspondingly, in the step, "if the comparison result meets the first comparison judgment standard, it is determined that the coping strategy of the case has good quality and is the optimal grade", that is: if P2-P1＞P0And R is2-R1＜R0In this case, it is shown that the average value of the yield per unit time is not decreased or is not significantly decreased and the average value of the fuel per unit time is not increased or is not significantly increased as compared with the dry quenching period, and thus it is determined that the countermeasure quality of this case is good and the case is the optimum grade.
The second comparison criterion is P2-P1＞P0And R is2-R1≥R0Correspondingly, in the step "if the comparison result meets the second comparison and judgment standard, it is determined that the coping strategy of the case has good quality and is qualified grade", that is: if P2-P1＞P0And R is2-R1≥R0It is shown that the average yield per unit time is not reduced or is not significantly reduced in the wet quenching period compared to the dry quenching period, but aloneThe bit time fuel ratio mean value increase was large, and it was understood that the fuel ratio was appropriately increased in consideration of the moisture content of wet quenching, and thus it was judged that the countermeasure of this case was of good quality and of acceptable grade.
The third comparison judgment standard comprises two, one of which is P2-P1≤P0And R is2-R1＜R0And the other is P2-P1≤P0And R is2-R1≥R0. Wherein, if P2-P1≤P0And R is2-R1＜R0In the case of the wet quenching period, the fuel ratio per unit time was not increased or was not increased significantly as compared with the dry quenching period, but the decrease of the production average per unit time was too large, and it was determined that the countermeasure quality of this case was poor and was an unacceptable grade. If P2-P1≤P0And R is2-R1≥R0In this case, it is shown that the wet quenching period is not only a case where the decrease of the production average per unit time is too large but also a case where the increase of the production average per unit time is large as compared with the dry quenching period, and thus it is determined that the countermeasure quality of the case is poor and is the alert level.
Wherein, in a preferred embodiment, P0Set to-500 tons, R0Set to 5 kg/ton.
Hereinafter, also taking the production history of the blast furnace a as an example as described above, the coping strategy quality of each case determined based on this step, on which parameters such as the yield difference between the wet quenching period and the dry quenching period (P2-P1), the fuel ratio difference between the wet quenching period and the dry quenching period (R2-R1), etc., are obtained by processing the respective data of tables 5 and 9 above, is exemplified by the following table 10.
[ Table 10]
The method comprises the following steps: and determining furnace condition characterization parameter standards of the preferred time for dry quenching to wet quenching, and constructing a preferred time case library, wherein the furnace condition characterization parameters of each case dry quenching period are matched with the furnace condition characterization parameter standards.
In each case in the preferred opportunity case library, the furnace condition characterizing parameters of the dry quenching period are matched with the furnace condition characterizing parameter standards, so that the production state transition of dry quenching to wet quenching of the cases is carried out at the preferred opportunity.
Preferably, the step of determining furnace condition characterization parameter standards possessed by the preferred time for dry quenching and wet quenching and constructing a preferred time case library comprises the steps of: and dividing the case library into a plurality of case groups according to different furnace condition characterization parameters of the dry quenching period of each case in the case library.
In the preferred embodiment, the case base is divided into three, an antecedent-period case group, an improvement-period case group and a deterioration-period case group.
In particular, the maximum value P of the production per unit time of the coke dry quenching period of one casemaxAnd maximum value of production per unit time PminWhen the difference value of (d) does not exceed the standard delta P of the yield per unit time, the cases are divided into the case group of the forward run period, for example, the dry quenching period of an exemplary case is from 0 point of 21/1/2018 to 24 points of 31/2018/1/10, the yield of the 3 rd day (i.e., from 0 point of 23/1/2018 to 24 points of 23/1/2018) in the 10 days is the maximum, and the maximum P of the yield per unit time constituting the dry quenching period ismaxThe production on the 5 th day of the 10 days (i.e. 0 o 'clock in month 1 and 25 of 2018 to 24 o' clock in month 1 and 25 of 2018) is the minimum, and the maximum value P of the production per unit time of the dry quenching period is formedminAnd P ismax-PminDeltaP, that is, the yield per unit time of the case in the dry quenching period is not changed greatly and is kept in a stable state approximately, the case is divided into a case group in the forward period. Wherein preferably Δ P is set to 300 tons.
When the yield per unit time P of the coke dry quenching period of a case shows a growing trend, the case is divided into an improvement period case group. In specific implementation, a fitting curve is made for the yield per unit time P of the coke dry quenching period of the case, the fitting curve is in an increasing trend, and the yield per unit time of the coke dry quenching period is gradually increased, so that the case is divided into an improvement period case group.
When the yield per unit time P of the case in the dry quenching period is in a descending trend, dividing the case into a deterioration period case group. In specific implementation, a fitting curve is made for the yield per unit time P of the coke dry quenching period of the case, the fitting curve is in a descending trend, the yield per unit time of the coke dry quenching period is gradually reduced, and the case is divided into a deterioration period case group.
In the above embodiment, the output per unit time is selected as the characteristic furnace condition characterizing parameter for dividing each case group in the step, and of course, in the variation embodiment, other furnace condition characterizing parameters can be selected as the basis for dividing the case groups.
Preferably, the step of determining furnace condition characterization parameter standards possessed by the preferred time for dry quenching and wet quenching and constructing a preferred time case library further comprises the steps of:
counting the proportion of cases with good quality of coping strategies in each case group;
and determining furnace condition characterization parameter standards of the preferred time for dry quenching to wet quenching based on the case group with the largest proportion, and constructing the case group as a preferred time case library.
Specifically, in a preferred embodiment, the percentage of cases with good quality of coping strategies in the case group in the forward period is counted, the percentage of cases with good quality of coping strategies in the case group in the improvement period is counted, the percentage of cases with good quality of coping strategies in the case group in the deterioration period is counted, and the percentage of cases with good quality of coping strategies in the case group in the deterioration period is counted, C; if B > a > C, the furnace condition characterization parameter criteria of the preferred time for dry quenching to wet quenching is determined to be the furnace condition characterization parameters of the dry quenching period corresponding to the improvement period case group based on the improvement period case group, and the determination A, B, C is: the yield per unit time P of the coke dry quenching period is in an increasing trend, and the improvement period caseThe group is constructed into a case library of the preferred time; if A is more than B and is more than C, for example, based on the forward time case group, the furnace condition characterization parameter standard of the preferable time for dry quenching to wet quenching is determined to be the furnace condition characterization parameter of the dry quenching period corresponding to the forward time case group, and the furnace condition characterization parameter standard is as follows: maximum value of yield per unit time P in dry quenching periodmaxAnd maximum value of production per unit time PminThe difference value of (A) does not exceed the standard delta P of the yield difference in unit time, and the antecedent period case group is constructed into a case base of the preferred opportunity.
Further preferably, the quality of the strategy to be responded is divided into two grades, namely the grade with the optimal quality of the strategy to be responded and the grade with qualified quality of the strategy to be responded. In the step of counting the ratio of the cases with good quality of the coping strategies in each case group, the ratio of the sum of the cases with the optimal quality level of the coping strategies and the qualified quality level of the coping strategies in each case group is counted.
The method comprises the following steps: and acquiring current furnace condition characterization parameters, and generating a prompt suitable for dry quenching to wet quenching when the current furnace condition characterization parameters are matched with the furnace condition characterization parameter standard.
The step is that whether the current time is the preferred time for transferring the dry quenching coke to the wet quenching coke is judged according to the current condition of the blast furnace, and when the current time is the preferred time, a prompt suitable for transferring the dry quenching coke to the wet quenching coke is generated so as to further start the production action of transferring the dry quenching coke to the wet quenching coke based on the prompt, thereby increasing the stable probability of the blast furnace condition after transferring the dry quenching coke to the wet quenching coke.
In a preferred embodiment, the preferred timing of dry quenching to wet quenching, such as determined according to the foregoing steps, has furnace condition characterizing parameter criteria of: if the yield P in unit time of the dry quenching period is in an increasing trend, in the step, the yield in unit time of a plurality of unit periods such as 10 days traced back at the current moment is obtained, whether the yield in unit time within the current 10 days is in the increasing trend is judged, if the judgment result is yes, the production action suitable for dry quenching to wet quenching is considered to be carried out at the moment, a prompt suitable for dry quenching to wet quenching is generated, and if not, the production action suitable for dry quenching to wet quenching is not carried out.
The method comprises the following steps: and comparing the current operating parameters, furnace body data and furnace charge data with each case with good quality of coping strategies in the case library at the optimal time, screening out the cases with larger matching degree, and generating the coping strategy for converting the dry quenching into the wet quenching by referring to the operating parameters of the screened cases in the wet quenching period.
Based on the step, one or more good-quality cases of the coping strategies which are closest to the current operating parameters, furnace body data and furnace charge data can be screened from the optimal time case library, and then the coping strategies of the current dry quenching to wet quenching are generated according to the screened cases, so that on one hand, under the condition that the current time is the adjusted optimal time, the coping strategies of the cases with good-quality strategies are used for reference, the stable running probability of the furnace conditions after the current dry quenching to wet quenching can be further improved, on the other hand, the referenced cases are closest to the current situation in terms of the operating parameters, the furnace body data and the furnace charge data, the coping strategies quality of the dry quenching to wet quenching is ensured, and the current operating parameters and the like can be changed as little as possible.
Preferably, the step of comparing the current operating parameters, furnace body data and furnace charge data with each case with good strategy quality in the case base at the preferred time and screening out the case with larger matching degree comprises the steps of:
comparing the current operating parameters, furnace body data and furnace burden data with each case with good coping strategy quality in the case library at the optimal time;
screening out a plurality of alternative cases with the matching degree larger than a set standard;
and selecting a reference case from the plurality of alternative cases according to the optimal grade and the qualified grade of the quality of the coping strategy.
That is, a plurality of alternative cases are screened out according to whether the matching degree is greater than the set standard, and then the alternative case with the optimal quality grade of the coping strategy is preferentially selected from the alternative cases to be used as the final reference case, so that the accuracy of the coping strategy for converting dry quenching coke into wet quenching coke can be further ensured, the better coping effect can be ensured, the severe fluctuation of the furnace condition caused by converting dry quenching coke into wet quenching coke can be avoided, and the fluctuation resistance of the furnace condition can be improved.
Further preferably, the step of "referring to the operation parameters of the screened cases in the wet quenching period to generate a coping strategy for transferring dry quenching to wet quenching" includes: and analyzing the correlation change of the operation parameters of the screened cases in the wet quenching period and the furnace condition characterization parameters along with time, and generating a coping strategy for converting dry quenching into wet quenching according to the analysis result.
For example, the wet quenching period of the illustrative case is from 0 point at 1/2018 to 24 points at 10/2018/2, and during the wet quenching period of 10 days, the furnace condition characterization parameters of the wet quenching period undergo a process of becoming better from a difference along with the adjustment of the operation parameters for a plurality of times, and the current coping strategy for dry quenching to wet quenching is determined based on the operation parameters causing the furnace condition characterization parameters to become better through the correlated change of the operation parameters and the furnace condition characterization parameters of the wet quenching period along with the time.
The invention also provides a coping system for dry quenching and wet quenching of a blast furnace, which comprises a memory and a processor, wherein the memory stores a computer program capable of running on the processor, and the processor can realize any step in the coping method when executing the computer program.
Wherein the coping system can be implemented by any one or combination of a computer device including a memory and a processor, a programmable logic controller, a computer readable storage medium storing a computer program, any other suitable machine having at least one processor.
In summary, compared with the prior art, the present embodiment has the following beneficial effects: by comparing the current furnace condition characterization parameters with the furnace condition characterization parameter standards, the optimal time for dry quenching to wet quenching can be accurately grasped, so that the production action of dry quenching to wet quenching is prevented from being started blindly, and severe fluctuation of the furnace condition caused by dry quenching to wet quenching at wrong time is further prevented; moreover, cases with good strategy quality are screened from the case library at the optimal time for reference, so that the accuracy of the current strategy for converting dry quenching coke into wet quenching coke is improved, a better response effect is ensured, severe fluctuation of furnace conditions caused by converting dry quenching coke into wet quenching coke is avoided, and the fluctuation resistance of the furnace conditions is improved; moreover, the referenced case is closest to the current situation in the aspects of operation parameters, furnace body data and furnace charge data, so that the quality of a coping strategy for converting dry quenching coke into wet quenching coke is ensured, and the current operation parameters and the like can be changed as little as possible.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method for responding to dry quenching to wet quenching of a blast furnace is characterized by comprising the following steps:
constructing a case library for transferring dry quenching coke to wet quenching coke in a production history, wherein each case has production data of a wet quenching coke period and production data of a dry quenching coke period before the wet quenching coke period, and the production data comprises operation parameters, furnace body data, furnace burden data and furnace condition characterization parameters;
comparing the furnace condition characterization parameters of the wet quenching period and the dry quenching period of each case, and judging the quality of the coping strategies of the case;
determining a dry quenching period furnace condition characterization parameter standard of the optimal time for dry quenching to wet quenching, and constructing an optimal time case library, wherein the furnace condition characterization parameter of the dry quenching period of each case is matched with the furnace condition characterization parameter standard of the dry quenching period;
acquiring current furnace condition characterization parameters, and generating a prompt suitable for dry quenching to wet quenching when the current furnace condition characterization parameters are matched with a furnace condition characterization parameter standard in a dry quenching period;
comparing the current operating parameters, furnace body data and furnace charge data with each case with good quality of coping strategies in the case library at the optimal time, screening out the case with larger matching degree, and generating the coping strategy of converting dry quenching into wet quenching by referring to the operating parameters of the screened case in the wet quenching period;
the method comprises the following steps of determining a dry quenching period furnace condition characterization parameter standard of an optimal time for dry quenching to wet quenching, and constructing an optimal time case library:
dividing the case base into a plurality of case groups according to different furnace condition characterization parameters of each case in the dry quenching period in the case base;
counting the proportion of cases with good quality of coping strategies in each case group;
and determining a dry quenching period furnace condition characterization parameter standard of the optimal time for dry quenching to wet quenching based on the case group with the largest proportion, and constructing the case group as an optimal time case library.
2. The method for responding to dry quenching to wet quenching of blast furnace as claimed in claim 1, wherein the step of constructing a case library of dry quenching to wet quenching in production history comprises the steps of:
the method comprises the steps of obtaining production data and time information of the production data in production history, and storing the production data and the time information of the production data in a database, wherein the production data comprise operation parameters, furnace body data, furnace burden data and furnace condition representation parameters, and the furnace burden data comprise coke information;
generating a case base construction instruction, wherein the case base construction instruction comprises an initial time, a termination time and a unit period;
extracting production data between the starting time and the ending time from a database in a unit period;
the coke in each unit period is marked as wet quenching coke or dry quenching coke by comparing with the coke sample;
and constructing a case library according to the marking result, wherein the wet quenching period of each case consists of a plurality of continuous unit periods marked with wet quenching, and the dry quenching period consists of a plurality of continuous unit periods marked with dry quenching before the wet quenching period.
3. The method of claim 2, wherein in the step of "labeling coke per unit cycle as wet quenching or dry quenching by comparison with a coke sample", the coke is labeled as wet quenching when any one or more of moisture content, average particle size, cold strength, and hot strength of the coke per unit cycle matches the wet quenching sample standard, and is labeled as dry quenching otherwise.
4. The method for responding to dry quenching and wet quenching of a blast furnace as claimed in claim 1, wherein the step of comparing the furnace condition characterization parameters of the wet quenching period of each case with the furnace condition characterization parameters of the dry quenching period thereof and determining the quality of the response strategy of the case comprises the steps of:
comparing the furnace condition characterization parameters of the case in the wet quenching period with the furnace condition characterization parameters of the case in the dry quenching period;
if the comparison result meets the first comparison judgment standard, judging that the coping strategy quality of the case is good and the coping strategy quality is the optimal grade;
if the comparison result meets the second comparison and judgment standard, judging that the coping strategy of the case has good quality and is in a qualified grade;
if the comparison result meets the third comparison judgment standard, judging that the coping strategy quality of the case is poor;
the method comprises the following steps of comparing current operating parameters, furnace body data and furnace charge data with each case with good coping strategy quality in a case library at the best time, and screening out the case with larger matching degree, wherein the method comprises the following steps:
comparing the current operating parameters, furnace body data and furnace burden data with each case with good quality of coping strategies in the case library at the best time;
screening out a plurality of alternative cases with the matching degree larger than a set standard;
and selecting a reference case from the plurality of alternative cases according to the optimal grade and the qualified grade of the quality of the coping strategy.
5. The method of handling blast furnace dry quenching to wet quenching as claimed in claim 4, wherein the wet quenching period and the dry quenching period of each case have a plurality of unit times;
the step of comparing the furnace condition characterization parameters of the case in the wet quenching period with the furnace condition characterization parameters of the case in the dry quenching period comprises the following steps: average value of yield per unit time of wet quenching period P of case2Fuel ratio per unit time average value R2With its average value of the yield per unit time in the dry quenching period P1Fuel ratio per unit time average value R1Respectively comparing;
the first comparison criterion is P2-P1＞P0And R is2-R1＜R0In which P is0As a standard of variation of the mean value of the production per unit time, R0Is a fuel ratio average value change standard per unit time;
the second comparison criterion is P2-P1＞P0And R is2-R1≥R0；
The third comparison criterion comprises P2-P1≤P0And R is2-R1＜R0、P2-P1≤P0And R is2-R1≥R0Wherein, if P2-P1≤P0And R is2-R1＜R0Judging that the coping strategy of the case is poor in quality and unqualified; if P2-P1≤P0And R is2-R1≥R0And judging that the coping strategy quality of the case is poor and is in an alert level.
6. The method of handling blast furnace dry quenching to wet quenching as claimed in claim 1, wherein the wet quenching period and the dry quenching period of each case have a plurality of unit times;
the method comprises the following steps of dividing a case base into a plurality of case groups according to different furnace condition characterization parameters of each case in a dry quenching period in the case base:
maximum value of production per unit time P of dry quenching period of current casemaxAnd maximum value of production per unit time PminWhen the difference value of the case is not more than the standard delta P of the yield difference in unit time, dividing the case into a forward-going period case group;
when the yield P per unit time of the cases in the dry quenching period is in the increasing trend, dividing the cases into an improvement period case group;
when the yield per unit time P of the case in the dry quenching period is in a descending trend, dividing the case into a deterioration period case group.
7. The method for responding to dry quenching to wet quenching of a blast furnace as claimed in claim 1, wherein the step of "referring to the operation parameters of the screened cases in the wet quenching period, generating a current strategy for responding to dry quenching to wet quenching" is: and analyzing the correlated change of the operation parameters of the wet quenching period and the furnace condition characterization parameters of the case along with time, and generating a coping strategy for converting dry quenching into wet quenching according to the analysis result.
8. The method for handling dry quenching to wet quenching of a blast furnace as claimed in claim 1, wherein the operating parameters include distribution schedule parameters, lower conditioning schedule parameters, cooling schedule parameters, and slagging schedule parameters.
9. A system for handling blast furnace dry quenching and wet quenching, which is characterized by comprising a memory and a processor, wherein the memory stores a computer program capable of running on the processor, and the processor can realize the steps of the method for handling blast furnace dry quenching and wet quenching according to any one of claims 1 to 8 when executing the computer program.
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