CN110580017B - High-precision prediction method for blast furnace feeding speed - Google Patents
High-precision prediction method for blast furnace feeding speed Download PDFInfo
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/41865—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by job scheduling, process planning, material flow
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- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2300/00—Process aspects
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
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- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention belongs to the technical field of industrial production, in particular to a high-precision prediction method of blast furnace feeding speed, aiming at the problem that the influence of a furnace top feeding mode on the feeding speed causes the waste of equipment capacity, the following scheme is provided. The invention divides the forming logic of the feeding signal into two modes of feeding according to batches and feeding according to tanks, analyzes the feeding mode and the feeding speed respectively under two modes of good blast furnace condition, stable operation of equipment and inconsistent blast furnace condition when the equipment breaks down, obtains the control method required by the maximum feeding speed, maximizes the feeding speed of the blast furnace, improves the production efficiency, simultaneously, technicians can predict the feeding speed more accurately, and has great guiding significance for the design and debugging of related projects.
Description
Technical Field
The invention relates to the technical field of industrial production, in particular to a high-precision prediction method for the feeding speed of a blast furnace.
Background
The feeding system is the main component of the blast furnace process, and comprises two systems of under-groove feeding and top material distribution, in recent years, along with the increasing of the effective furnace capacity of a newly-built blast furnace, the belt feeding and bell-less top process is generally adopted, the feeding speed is the most important index of the feeding system, and directly influences the yield and the energy efficiency of the blast furnace, and practice proves that the feeding speed is influenced by multiple factors and mainly comprises the following aspects: the maximum feeding capacity of the feeding equipment under the trough; the maximum material distribution capacity of the furnace top material distribution equipment; the feeding capacity of the feeding main belt; a material feeding mode at the top of the blast furnace.
Through retrieval, chinese patent publication No. CN101604146B discloses a control method of an automatic control system for blast furnace feeding, which sends a control instruction to a blast furnace feeding device through its external I/O port cache data area and receives the state feedback of the blast furnace feeding device, and is characterized in that it also connects with an automatic control simulation system for blast furnace feeding through its external data exchange storage area and sends a control instruction to the automatic control simulation system for blast furnace feeding, and the automatic control simulation system for blast furnace feeding simulates a state feedback signal including the running state of the blast furnace feeding device and the state of the material movement position under the control instruction and feeds back the signal to the automatic control system for blast furnace feeding.
The maximum capacity of the under-groove feeding equipment and the furnace top distributing equipment can be determined according to the design parameters of the blast furnace, the length of the main feeding belt needs to be matched with the capacity of the under-groove feeding equipment, in actual production, process personnel often do not realize the influence of a furnace top feeding mode on the feeding speed, and therefore the equipment capacity is wasted, and the control method of the automatic blast furnace feeding control system in the patent cannot realize high-precision prediction.
Disclosure of Invention
The invention provides a high-precision prediction method for the feeding speed of a blast furnace, which is based on the technical problem that the feeding speed is influenced by a furnace top feeding mode, so that the equipment capacity is wasted.
The invention provides a high-precision prediction method of blast furnace feeding speed, which comprises the following steps:
s1: establishing a mathematical model for a blast furnace feeding system, converting a material quantity model into a time length model, and providing a high-precision algorithm for predicting the feeding speed of the blast furnace, wherein the feeding speed is expressed by the number of feeding batches per hour, one feeding batch comprises two tanks of coke (marked as c) and ore (marked as 0), and after material proportioning and discharging, the coke and the ore form a material flow with a certain length on a main belt, and the length of the material flow can be calculated into a corresponding time length due to the constant running speed of the belt;
s2: analyzing the furnace top feeding mode and the feeding speed, and setting the ore duration as t0Coke duration of tcMeanwhile, in order to ensure the action time of furnace top equipment, enough safe interval needs to be kept between ore and coke material flows, and the safe interval between the ore and coke material flows is set as tf0Safe separation of coke from ore stream is tfc；
S3: a blast furnace feeding system model is created, and the method comprises the following three conditions: the furnace condition is not smooth, and the descending speed of the blast furnace burden line is slow; the related equipment of the lower tank fails; the related equipment of the tank feeding is in failure.
Preferably, the step of analyzing the top charging mode and the feeding speed comprises the following steps:
the ideal feed batch length is:
tl＝t0+tc+tf0+tfc
thus, the ideal feed rates are:
the ideal feed rate being dependent on t0、tc、tf0、tfcThe parameters are determined by the equipment capacity under the trough and the furnace top, namely the ideal feeding speed has no relation with the furnace top feeding mode and the main belt length factor;
in actual production, the ideal feeding speed is difficult to achieve, furnace top equipment is protected, the feeding speed is matched with the condition of a blast furnace, feeding control is introduced during actual operation, namely, only a feeding signal is sent by the furnace top, the blast furnace is fed under a trough, other constraint conditions can reach the ideal state, when the feeding time is always earlier than the end of a safety interval, the ideal feeding speed can be achieved, but when the feeding time is later than the end of the safety interval, the actual feeding speed is lower than the ideal feeding speed, tf0、tfcFor a theoretical safety interval, tf0′、tfc' actual stream spacing, in actual production, there is always tf0′≥tf0、tfc′≥tfc
At this point, the length of an actual feed batch is obtained as:
tl′＝t0+tc+tf0′+tfc′
if the feeding is continued according to the situation, the actual feeding speed is as follows:
due to tf0′≥tf0、tfc′≥tfcSo that K' is always less than or equal to K
The furnace top material requiring mode comprises two parts of contents, wherein the forming logic of the material requiring signals is divided into material requiring according to batches or material requiring according to a tank, the triggering time depends on the state of furnace top equipment, and a plurality of fixed material requiring modes can be formed after the two parts are combined;
in the actual operation of the tandem-tank top blast furnace, the triggering time of the charging signal mainly comprises the following types:
a stock line signal is obtained by the stock rod;
lifting the stock rod to the position;
a blanking gate opening signal;
a software delay signal;
others;
the method comprises the following steps that a stock line signal from a stock rod, a stock rod in-place lifting signal, a blanking gate opening signal and a software delay signal are mainly different time points in the same material distribution process, any one of the stock line signal, the stock rod in-place lifting signal, the blanking gate opening signal and the software delay signal can be used as a trigger moment of a material requiring signal, the material supply speed of the stock rod in long-term operation is consistent, if switching is suddenly carried out in the actual operation process, the material supply moment of the next batch of material can be directly influenced, and therefore a certain time is shortened or delayed in the next batch;
the method comprises the steps that supposing that a blanking gate opening signal is used as a material requiring triggering moment, the influence of two different logics of material requiring according to batch and material requiring according to tank on a feeding speed is analyzed, when the material requiring according to batch is opened in a certain material distributing process, a batch material requiring signal is triggered, after coke or ore of one tank is discharged under a tank, after a preset safety interval, the ore or coke of the next tank is automatically discharged under the tank without waiting for a new material requiring signal, and thus a complete batch is formed; when the material is required according to the tank and a blanking gate is opened in a certain material distribution process, a 'tank material requiring' signal is triggered, a tank of coke or ore is correspondingly discharged under the tank, and each discharge is controlled by the 'tank material requiring' signal;
when the materials are required in batches, the time interval between the ore and the coke is the safety time preset by the control program, and the time interval between the coke and the ore is limited by objective conditions; when the materials are required according to the tank, the time interval between coke and ore in each tank is restricted; the actual operators consider the materials according to the batch requirementThe feeding speed of the tank material is faster, and the tank material needs to be classified and analyzed according to different conditions and recorded with kPFor feeding in batches, KgThe feeding speed is the feeding speed when the tank needs to be fed.
Preferably, in S3, when the furnace conditions are not smooth and the descending speed of the blast furnace burden line is slow:
at the moment, the material-needing signal of the tank lags behind the end of a preset safe interval greatly, and a stock rod is selected to reach a stock line as the trigger moment of the material-needing signal:
tl＝t0+tc+tf0+tfc′
tl1′＝t0+tc+tf0+tfc1′
tl2′＝t0+tc+tf02′+tfc2′
tl2″＝t0+tc+tf02′+tfc
when the furnace conditions are not smooth, t always existsl1′≥t1，tl2′≥t1I.e. the feeding speed must be lower than the ideal speed;
when the materials are required according to the batch, t always exists due to unsmooth furnace conditionsfc1′≥tfcThe material requiring signal triggering time is always later than the end of the safety interval, so the safety interval does not form a limit condition on the material feeding speed; when the materials are required according to the tank, the following analysis conditions are required:
tfc2′≥tfcwhen the time is longer than the safety interval, the triggering time of the material requiring signal is always later than the end of the safety interval, the time sequences of the two logic blanking flows are completely overlapped, and the material feeding speeds are completely consistent; t is tfc2′＜tfcWhen the furnace is in a non-smooth state, K is always presentg≤Kp。
Preferably, in S3, the tank-unloading related deviceWhen a fault occurs, the blanking gate, the lower sealing valve and the pressure equalizing valve can not work normally, and if the material is required according to batches, 2 cans of material are continuously provided to the furnace top under the trough; if the fault cannot be timely eliminated, the main belt is triggered to carry materials to stop, but after the fault is eliminated, the main belt carries materials, so that the materials can be more quickly conveyed to the furnace top after the system recovers to operate; if the material is required according to the tank, only 1 tank of material is provided to the top of the tank under the tank, if the upper tank can be emptied and normally works at the moment, the main belt cannot be stopped, but correspondingly, the speed of recovering the feeding after the fault is eliminated is slower than that of the material required according to the batch, so that when the furnace condition is not smooth, K always existsg≤Kp。
Preferably, in S3, when the upper tank related equipment fails, the upper sealing valve cannot work normally, and at this time, the main belt is stopped for belt material supply no matter the material is required in batches or in tanks, but after the failure is cleared, the main belt is stopped for belt material supply when the material is required in batches, so that the system can more quickly convey the material to the furnace top after the system recovers operation, and when the furnace condition is not smooth, there is always Kg≤Kp。
The beneficial effects of the invention are as follows:
the method is characterized in that the composition logic of a material requiring signal is divided into two modes of material requiring according to batches and material requiring according to tanks, the material requiring mode and the material feeding speed are respectively analyzed under two modes when the equipment fails under the conditions of good furnace condition of the blast furnace, stable operation of the equipment and unsmooth furnace condition of the blast furnace, and a control method required by the maximum material feeding speed is obtained.
Drawings
FIG. 1 is a diagram of a typical process configuration for a method of high accuracy blast furnace feed rate prediction according to the present invention;
FIG. 2 is an ideal material flow distribution diagram of a high-precision blast furnace feeding speed prediction method according to the present invention;
FIG. 3 is a diagram showing the actual material flow distribution of a method for predicting the feeding speed of a blast furnace with high accuracy according to the present invention;
FIG. 4 is a flow distribution diagram of different logics of a high-precision blast furnace feeding speed prediction method according to the present invention;
FIG. 5 is a distribution diagram of the material flow from the stock line as the triggering time of the material requiring signal in the method for predicting the feeding speed of the blast furnace with high accuracy according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-5, a method for predicting the feeding speed of a blast furnace with high accuracy comprises the following steps:
s1: establishing a mathematical model for a blast furnace feeding system, converting a material quantity model into a time length model, and providing a high-precision algorithm for predicting the feeding speed of the blast furnace, wherein the feeding speed is expressed by the number of feeding batches per hour, one feeding batch comprises two tanks of coke (marked as c) and ore (marked as 0), and after material proportioning and discharging, the coke and the ore form a material flow with a certain length on a main belt, and the length of the material flow can be calculated into a corresponding time length due to the constant running speed of the belt;
s2: analyzing the furnace top feeding mode and the feeding speed, and setting the ore duration as t0Coke duration of tcMeanwhile, in order to ensure the action time of furnace top equipment, enough safe interval needs to be kept between ore and coke material flows, and the safe interval between the ore and coke material flows is set as tf0Safe separation of coke from ore stream is tfc；
S3: a blast furnace feeding system model is created, and the method comprises the following three conditions: the furnace condition is not smooth, and the descending speed of the blast furnace burden line is slow; the related equipment of the lower tank fails; the related equipment of the tank feeding is in failure.
In the invention, the steps of analyzing the furnace top feeding mode and the feeding speed are as follows:
the ideal feed batch length is:
tl＝t0+tc+tf0+tfc
thus, the ideal feed rates are:
the ideal feed rate being dependent on t0、tc、tf0、tfcThe parameters are determined by the equipment capacity under the trough and the furnace top, namely the ideal feeding speed has no relation with the furnace top feeding mode and the main belt length factor;
in actual production, the ideal feeding speed is difficult to achieve, furnace top equipment is protected, the feeding speed is matched with the condition of a blast furnace, feeding control is introduced during actual operation, namely, only a feeding signal is sent by the furnace top, the blast furnace is fed under a trough, other constraint conditions can reach the ideal state, when the feeding time is always earlier than the end of a safety interval, the ideal feeding speed can be achieved, but when the feeding time is later than the end of the safety interval, the actual feeding speed is lower than the ideal feeding speed, tf0、tfcFor a theoretical safety interval, tf0′、tfc' actual stream spacing, in actual production, there is always tf0′≥tf0、tfc′≥tfc
At this point, the length of an actual feed batch is obtained as:
tl′＝t0+tc+tf0′+tfc′
if the feeding is continued according to the situation, the actual feeding speed is as follows:
due to tf0′≥tf0、tfc′≥tfcSo that K' is always less than or equal to K
The furnace top material requiring mode comprises two parts of contents, wherein the forming logic of the material requiring signals is divided into material requiring according to batches or material requiring according to a tank, the triggering time depends on the state of furnace top equipment, and a plurality of fixed material requiring modes can be formed after the two parts are combined;
in the actual operation of the tandem-tank top blast furnace, the triggering time of the charging signal mainly comprises the following types:
a stock line signal is obtained by the stock rod;
lifting the stock rod to the position;
a blanking gate opening signal;
a software delay signal;
others;
the method comprises the following steps that a stock line signal from a stock rod, a stock rod in-place lifting signal, a blanking gate opening signal and a software delay signal are mainly different time points in the same material distribution process, any one of the stock line signal, the stock rod in-place lifting signal, the blanking gate opening signal and the software delay signal can be used as a trigger moment of a material requiring signal, the material supply speed of the stock rod in long-term operation is consistent, if switching is suddenly carried out in the actual operation process, the material supply moment of the next batch of material can be directly influenced, and therefore a certain time is shortened or delayed in the next batch;
the method comprises the steps that supposing that a blanking gate opening signal is used as a material requiring triggering moment, the influence of two different logics of material requiring according to batch and material requiring according to tank on a feeding speed is analyzed, when the material requiring according to batch is opened in a certain material distributing process, a batch material requiring signal is triggered, after coke or ore of one tank is discharged under a tank, after a preset safety interval, the ore or coke of the next tank is automatically discharged under the tank without waiting for a new material requiring signal, and thus a complete batch is formed; when the material is required according to the tank and a blanking gate is opened in a certain material distribution process, a 'tank material requiring' signal is triggered, a tank of coke or ore is correspondingly discharged under the tank, and each discharge is controlled by the 'tank material requiring' signal;
when the materials are required in batches, the time interval between the ore and the coke is the safety time preset by the control program, and the time interval between the coke and the ore is limited by objective conditions; when the materials are required according to the tank, the time interval between coke and ore in each tank is restricted; the actual operators think that the feeding speed is faster according to the batch feeding than the tank feeding, and need to classify and analyze according to different conditions, note kPFor feeding in batches, KgTo press the potThe feeding speed during feeding.
Wherein, in S3, when the furnace condition is not smooth and the descending speed of the blast furnace burden line is slow:
at the moment, the material-needing signal of the tank lags behind the end of a preset safe interval greatly, and a stock rod is selected to reach a stock line as the trigger moment of the material-needing signal:
tl＝t0+tc+tf0+tfc′
tl1′＝t0+tc+tf0+tfc1′
tl2′＝t0+tc+tf02′+tfc2′
tl2″＝t0+tc+tf02′+tfc
when the furnace conditions are not smooth, t always existsl1′≥t1，tl2′≥t1I.e. the feeding speed must be lower than the ideal speed;
when the materials are required according to the batch, t always exists due to unsmooth furnace conditionsfc1′≥tfcThe material requiring signal triggering time is always later than the end of the safety interval, so the safety interval does not form a limit condition on the material feeding speed; when the materials are required according to the tank, the following analysis conditions are required:
tfc2′≥tfcwhen the time is longer than the safety interval, the triggering time of the material requiring signal is always later than the end of the safety interval, the time sequences of the two logic blanking flows are completely overlapped, and the material feeding speeds are completely consistent; t is tfc2′＜tfcWhen the furnace is in a non-smooth state, K is always presentg≤Kp。
In S3, when the related equipment of the lower tank fails, the blanking gate, the lower sealing valve and the pressure equalizing valve cannot work normally, and if the materials are required in batches, 2 tanks of materials are continuously provided to the top of the furnace under the tank; if the fault can not be timely eliminatedIf the main belt is not in the normal running state, the main belt is triggered to stop the machine, but after the fault is eliminated, the main belt is fed, so that the system can more quickly convey the materials to the furnace top after the system recovers running; if the material is required according to the tank, only 1 tank of material is provided to the top of the tank under the tank, if the upper tank can be emptied and normally works at the moment, the main belt cannot be stopped, but correspondingly, the speed of recovering the feeding after the fault is eliminated is slower than that of the material required according to the batch, so that when the furnace condition is not smooth, K always existsg≤Kp。
In S3, when the related equipment of the upper tank fails, the upper sealing valve can not work normally, and at the moment, the main belt is taken to stop working no matter the material is required in batches or in tanks, but after the failure is eliminated, the main belt is taken to stop working when the material is required in batches, so the system can more quickly convey the material to the furnace top after recovering the operation, and when the furnace condition is not smooth, K always existsg≤Kp。
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A high-precision prediction method for the feeding speed of a blast furnace is characterized by comprising the following steps:
s1: establishing a mathematical model for a blast furnace feeding system, converting a material quantity model into a time length model, and providing a high-precision algorithm for predicting the feeding speed of the blast furnace, wherein the feeding speed is expressed by the number of feeding batches per hour, one feeding batch comprises two tanks of coke and ore, after batching and discharging, the coke and the ore form a material flow with a certain length on a main belt, and the length of the material flow can be calculated into a corresponding time length due to the constant running speed of the belt;
s2: analyzing the furnace top feeding mode and the feeding speed, and setting the ore duration as t0Coke duration of tcWhile maintaining adequate safety between the ore and coke streams to ensure the operation time of the top equipmentFull separation, provided that the safe separation of the ore and coke streams is tf0Safe separation of coke from ore stream is tfc；
S3: a blast furnace feeding system model is created, and the method comprises the following three conditions: the furnace condition is not smooth, and the descending speed of the blast furnace burden line is slow; the related equipment of the lower tank fails; the related equipment of the tank feeding is in failure.
2. The method for predicting the feeding speed of the blast furnace with high accuracy according to claim 1, wherein the step of analyzing the top charging mode and the feeding speed comprises the following steps:
the ideal feed batch length is:
tl＝t0+tc+tf0+tfc
thus, the ideal feed rates are:
the ideal feed rate being dependent on t0、tc、tf0、tfcThe parameters are determined by the equipment capacity under the trough and the furnace top, namely the ideal feeding speed has no relation with the furnace top feeding mode and the main belt length factor;
in actual production, the ideal feeding speed is difficult to achieve, furnace top equipment is protected, the feeding speed is matched with the condition of a blast furnace, feeding control is introduced during actual operation, namely, only a feeding signal is sent by the furnace top, the blast furnace is fed under a trough, other constraint conditions can reach the ideal state, when the feeding time is always earlier than the end of a safety interval, the ideal feeding speed can be achieved, but when the feeding time is later than the end of the safety interval, the actual feeding speed is lower than the ideal feeding speed, tf0、tfcFor a theoretical safety interval, tf0′、tfc' actual stream spacing, in actual production, there is always tf0′≥tf0、tfc′≥tfc
At this point, the length of an actual feed batch is obtained as:
tl′＝t0+tc+tf0′+tfc′
if the feeding is continued according to the situation, the actual feeding speed is as follows:
due to tf0′≥tf0、tfc′≥tfcSo that K' is always less than or equal to K
The furnace top material requiring mode comprises two parts of contents, wherein the forming logic of the material requiring signals is divided into material requiring according to batches or material requiring according to a tank, the triggering time depends on the state of furnace top equipment, and a plurality of fixed material requiring modes can be formed after the two parts are combined;
in the actual operation of the tandem-tank top blast furnace, the triggering time of the charging signal mainly comprises the following types:
a stock line signal is obtained by the stock rod;
lifting the stock rod to the position;
a blanking gate opening signal;
a software delay signal;
others;
the method comprises the following steps that a stock line signal from a stock rod, a stock rod in-place lifting signal, a blanking gate opening signal and a software delay signal are mainly different time points in the same material distribution process, any one of the stock line signal, the stock rod in-place lifting signal, the blanking gate opening signal and the software delay signal can be used as a trigger moment of a material requiring signal, the material supply speed of the stock rod in long-term operation is consistent, if switching is suddenly carried out in the actual operation process, the material supply moment of the next batch of material can be directly influenced, and therefore a certain time is shortened or delayed in the next batch;
the method comprises the steps that supposing that a blanking gate opening signal is used as a material requiring triggering moment, the influence of two different logics of material requiring according to batch and material requiring according to tank on a feeding speed is analyzed, when the material requiring according to batch is opened in a certain material distributing process, a batch material requiring signal is triggered, after coke or ore of one tank is discharged under a tank, after a preset safety interval, the ore or coke of the next tank is automatically discharged under the tank without waiting for a new material requiring signal, and thus a complete batch is formed; when the material is required according to the tank and a blanking gate is opened in a certain material distribution process, a 'tank material requiring' signal is triggered, a tank of coke or ore is correspondingly discharged under the tank, and each discharge is controlled by the 'tank material requiring' signal;
when the materials are required in batches, the time interval between the ore and the coke is the safety time preset by the control program, and the time interval between the coke and the ore is limited by objective conditions; when the materials are required according to the tank, the time interval between coke and ore in each tank is restricted; the actual operators think that the feeding speed is faster according to the batch feeding than the tank feeding, and need to classify and analyze according to different conditions, note kPFor feeding in batches, KgThe feeding speed is the feeding speed when the tank needs to be fed.
3. The method of claim 2, wherein in step S3, when the furnace conditions are not smooth and the lowering of the blast furnace burden line is slow:
at the moment, the material-needing signal of the tank lags behind the end of a preset safe interval greatly, and a stock rod is selected to reach a stock line as the trigger moment of the material-needing signal:
tl＝t0+tc+tf0+tfc′
tl1′＝t0+tc+tf0+tfc1′
tl2′＝t0+tc+tf02′+tfc2′
tl2″＝t0+tc+tf02′+tfc
when the furnace conditions are not smooth, t always existsl1′≥t1，tl2′≥t1I.e. the feeding speed must be lower than the ideal speed;
when the materials are required according to the batch, t always exists due to unsmooth furnace conditionsfc1′≥tfcThe material requiring signal triggering time is always later than the end of the safety interval, so the safety interval does not form a limit condition on the material feeding speed; when the materials are required according to the tank, the following analysis conditions are required:
tfc2′≥tfcwhen the time is longer than the safety interval, the triggering time of the material requiring signal is always later than the end of the safety interval, the time sequences of the two logic blanking flows are completely overlapped, and the material feeding speeds are completely consistent; t is tfc2′＜tfcWhen the furnace is in a non-smooth state, K is always presentg≤Kp。
4. The method of claim 3, wherein in step S3, when the lower tank related equipment fails, the blanking gate, the lower sealing valve and the pressure equalizing valve cannot work normally, and if the material is required in batches, the lower tank will continuously supply 2 tanks of material to the top of the furnace; if the fault cannot be timely eliminated, the main belt is triggered to carry materials to stop, but after the fault is eliminated, the main belt carries materials, so that the materials can be more quickly conveyed to the furnace top after the system recovers to operate; if the material is required according to the tank, only 1 tank of material is provided to the top of the tank under the tank, if the upper tank can be emptied and normally works at the moment, the main belt cannot be stopped, but correspondingly, the speed of recovering the feeding after the fault is eliminated is slower than that of the material required according to the batch, so that when the furnace condition is not smooth, K always existsg≤Kp。
5. The method of claim 4, wherein in step S3, when the upper tank related equipment is out of order, the upper sealing valve is not working properly, and the main belt is stopped for both batch and tank feeding, but when the failure is cleared, the system can return to operation to deliver the material to the top of the blast furnace more quickly because the main belt is stopped for batch feeding, so there is always K when the furnace condition is not smoothg≤Kp。
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| CN110580017B true CN110580017B (en) | 2021-04-20 |
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| CN104988261A (en) * | 2015-06-30 | 2015-10-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Blast furnace belt feeding system and material list setting method thereof |
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