阅读说明：本技术 一种转炉冶炼生产系统用副原料料仓自动称量控制方法 (Automatic weighing control method for auxiliary raw material bin for converter smelting production system ) 是由 陆万钧 严滨 白颖 于 2018-06-27 设计创作，主要内容包括：本发明揭示了一种转炉冶炼生产系统用副原料料仓自动称量控制方法及方法,采用吹炼时间基准与氧量基准双基准控制、副原料称量顺序表控制,实现转炉副原料称量全自动控制。本发明根据每炉钢的实际情况形成控制决策,自动制作出称量控制模式,并控制副原料称量机执行,改变了转炉副原料称量采用手动或半自动操作的传统方法；从而将副原料系统操作规范化、标准化、自动化,改善操作人员个体技术水平偏差,有利于提高转炉副原料系统操作的整体水平,稳定转炉生产。(The invention discloses an automatic weighing control method and method for an auxiliary raw material bin for a converter smelting production system, which realize full-automatic control of the auxiliary raw material weighing of a converter by adopting double-reference control of a blowing time reference and an oxygen amount reference and control of an auxiliary raw material weighing sequence table. According to the invention, a control decision is formed according to the actual condition of each furnace steel, a weighing control mode is automatically manufactured, and the auxiliary raw material weighing machine is controlled to execute, so that the traditional method that the auxiliary raw material weighing of the converter is manually or semi-automatically operated is changed; therefore, the operation of the auxiliary raw material system is standardized, standardized and automated, the individual technical level deviation of operators is improved, the integral level of the operation of the auxiliary raw material system of the converter is improved, and the production of the converter is stabilized.)

1. An automatic weighing control method of an auxiliary raw material bin for a converter smelting production system is characterized by comprising the following steps:

s1, L2 calculates the auxiliary raw material weighing data according to the steel model and the iron receiving data (or the auxiliary gun measuring data), and executes the step S2;

s2, L2 issues the weighing data, judges whether the weighing data needs to be modified, if so, executes the step S3, and if not, executes the step S4;

s3, confirming the data by an operator, modifying the weighing data, sending a data confirmation signal to L2, and executing the step S2;

s4, judging whether the weighing hopper meets the conditions or not, executing a step S5 if the weighing hopper meets the conditions, and executing a step S3 if the weighing hopper does not meet the conditions;

s5, starting the batch weighing, waiting for the set weighing oxygen amount, and executing the step S6;

s6, judging whether the weighing set weight is more than 0, if so, executing a step S7, and if not, executing a step S8;

s7, starting the feeder, judging that the weight-initial weight deviation of the weighing hopper is smaller than the dispersion amount, if the weight-initial weight deviation of the weighing hopper is smaller than the dispersion amount, stopping the weighing feeder, putting the materials into a collecting hopper, adding 1 to the number of the materials weighed in the batch, and executing the step S8;

s8, judging whether the material of the batch is completely added, if so, executing the step S9, and if not, executing the step S6;

s9, waiting for the oxygen converting amount to be larger than the preset oxygen amount or reaching the time, executing the step S10;

and S10, feeding the materials into the converter, and finishing feeding.

2. The automatic weighing control method of the auxiliary raw material bin for the converter smelting production system according to claim 1, characterized in that: in step S1, each silo input PATTERN is automatically constructed on the basis of the rule in L2, and includes the total amount of each silo sub-raw material input, the F1 (start of blowing) input amount, the start time of each weighing in the blowing process, and the sub-raw material weight.

3. The automatic weighing control method of the auxiliary raw material bin for the converter smelting production system according to claim 2, characterized in that: in the step S1, if there are multiple materials to be prepared in the corresponding weighing system in the same batch, the materials are prepared according to the size sequence of the bin numbers, and the principle of preparing materials first according to the smaller bin number is followed.

4. The automatic weighing control method of the auxiliary raw material bin for the converter smelting production system according to claim 1, characterized in that: step S4, the set weight of the materials in the high-level storage bin is not more than the upper weighing limit of the corresponding weighing hopper; if the set weight of the materials in the high-level stock bin is not zero, the set weight of the materials in the high-level stock bin is not less than the effective error of the vibration feeder; the set volume of the materials in the high-level stock bin is not more than the upper limit of the volume of the corresponding weighing hopper; the set weight sum of the materials in the high-level storage bin is not more than the upper weighing limit of the corresponding summary hopper; the total volume of the materials in the high-level stock bin is set to be not more than the upper limit of the volume of the corresponding summary hopper; the total oxygen setting for the process batch must be from small to large.

5. The automatic weighing control method of the auxiliary raw material bin for the converter smelting production system according to claim 1, characterized in that: in step S7, the fall amount is (actual weighing value — weighing set value)/2.

Technical Field

The invention relates to an automatic weighing control technology of an auxiliary raw material bin, in particular to an automatic weighing control method of the auxiliary raw material bin for a converter smelting production system.

Background

The auxiliary raw materials comprise raw materials such as limestone, light-burned dolomite, iron ore, magnesium balls, a heating agent, a defoaming agent and the like, play roles of slagging, cooling, slag splashing and furnace protection in converter smelting and the like, are indispensable raw materials for converter smelting, and the auxiliary raw materials need to be added into the converter in batches during smelting. At present, converter smelting auxiliary raw material systems of various iron and steel production enterprises generally comprise 10-15 furnace top bins, each 3-4 furnace top bins correspond to a weighing system, and domestic various steel plants generally adopt the technological processes of bins, weighing feeders, weighing hoppers, collecting hoppers and converters to realize the charging operation in converter smelting. And the auxiliary raw materials are vibrated and dropped into a weighing hopper from a furnace top bin through an electromagnetic vibration feeder, weighed by a weighing machine and then placed into an intermediate hopper, and added into the converter as required during converter smelting.

In the original auxiliary raw material feeding system, six batches at most can be set in the full-automatic control mode in the whole smelting process, and once the processing starts, new calculation data of the model is not received any more, the model cannot update and correct the process in time. Because the scheme of batching automatic control is relatively simple and rigid, the batching process can not be reasonably optimized, and only three fixed batching modes are provided. If the original batching scheme is based on the simple expansion of batching quantity and batch quantity, a large amount of telegraph text can be generated, a large amount of system resources are occupied, and great influence is generated on the stability of a feeding system. In addition, the practical application process discovers that the weighing mode in a manual or semi-automatic mode in the prior art has the following defects:

1) for the same steel grade, different operators have different choices of weighing types, weighing sequences and feeding time due to different personal experiences, and the alloy feeding operation is difficult to standardize;

2) the requirements of steel in each furnace are inconsistent, and the converter smelting auxiliary raw material system with different requirements is difficult to deal with manually or semi-automatically;

3) because the operator also needs to consider the operation tasks of the oxygen lance and the sublance, the labor intensity of the work is high; and the large level is different, the individual operation difference is large, the weighing data is inaccurate, and the smooth proceeding of the subsequent production is directly influenced. In the smelting process, an operator needs to set the alloy weight, start alloy weighing, start weighing hopper discharging, start middle hopper feeding and the like through contacting a mouse and a keyboard for multiple times; and the alloy operator also needs to give consideration to the operation tasks of the oxygen lance and the sublance, and the working labor intensity is very high. Accidents of misnomer and misthrowing caused by multiple and complicated operations occur, and the quality of steel grades is seriously influenced.

In order to realize full-automatic feeding control for converter smelting, batch control needs to be re-planned, and a new batch control strategy is formulated. There is a need for a novel method for weighing secondary raw materials, which can quickly and effectively weigh the furnace top bin of a converter smelting secondary raw material system, and the weighing reference is controllable and reliable, and can eliminate individual differences caused by different levels of operators.

Disclosure of Invention

Technical problem to be solved

In order to solve the defect of the manual or semi-automatic weighing mode of the converter smelting auxiliary raw material system in the prior art, the invention provides an automatic weighing control method of an auxiliary raw material bin for a converter smelting production system, which adopts double-reference control of blowing time reference and oxygen quantity reference and control of an auxiliary raw material weighing sequence table to realize full-automatic control of the weighing of the auxiliary raw materials of the converter; the system forms a control decision according to the actual condition of each furnace steel, automatically produces a weighing control mode, controls the auxiliary raw material weighing machine to execute, and changes the traditional control method that the auxiliary raw material weighing of the converter adopts manual or semi-automatic operation; therefore, the operation of the auxiliary raw material system is standardized, standardized and automated, the individual technical level deviation of operators is improved, the integral level of the operation of the auxiliary raw material system of the converter is improved, and the production of the converter is stabilized.

(II) technical scheme

An automatic weighing control method of an auxiliary raw material bin for a converter smelting production system comprises the following steps:

s1, L2 calculates the auxiliary raw material weighing data according to the steel model and the iron receiving data (or the auxiliary gun measuring data), and executes the step S2;

s2, L2 issues the weighing data, judges whether the weighing data needs to be modified, if so, executes the step S3, and if not, executes the step S4;

s3, confirming the data by an operator, modifying the weighing data, sending a data confirmation signal to L2, and executing the step S2;

s4, judging whether the weighing hopper meets the conditions or not, executing a step S5 if the weighing hopper meets the conditions, and executing a step S3 if the weighing hopper does not meet the conditions;

s5, starting the batch weighing, waiting for the set weighing oxygen amount, and executing the step S6;

s6, judging whether the weighing set weight is more than 0, if so, executing a step S7, and if not, executing a step S8;

s7, starting the feeder, judging that the weight-initial weight deviation of the weighing hopper is smaller than the dispersion amount, if the weight-initial weight deviation of the weighing hopper is smaller than the dispersion amount, stopping the weighing feeder, putting the materials into a collecting hopper, adding 1 to the number of the materials weighed in the batch, and executing the step S8;

s8, judging whether the material of the batch is completely added, if so, executing the step S9, and if not, executing the step S6;

s9, waiting for the oxygen converting amount to be larger than the preset oxygen amount or reaching the time, executing the step S10;

and S10, feeding the materials into the converter, and finishing feeding.

According to an embodiment of the present invention, in step S1, each bin input PATTERN is automatically constructed according to the rule at L2, including the total amount of each bin sub-raw material input, the F1 (start of blowing) input, the time of each weighing start in the blowing process, and the sub-raw material weight.

According to an embodiment of the present invention, in the step S1, if there are multiple materials to be prepared in the corresponding weighing system in the same batch, the materials are prepared according to the size sequence of the bin numbers, and the principle of preparing materials first when the bin numbers are smaller is followed.

According to an embodiment of the present invention, the material set weight of the high-level bunker of the step S4 should not be greater than the upper weighing limit of the corresponding weighing hopper; if the set weight of the materials in the high-level stock bin is not zero, the set weight of the materials in the high-level stock bin is not less than the effective error of the vibration feeder; the set volume of the materials in the high-level stock bin is not more than the upper limit of the volume of the corresponding weighing hopper; the set weight sum of the materials in the high-level storage bin is not more than the upper weighing limit of the corresponding summary hopper; the total volume of the materials in the high-level stock bin is set to be not more than the upper limit of the volume of the corresponding summary hopper; the total oxygen setting for the process batch must be from small to large.

According to an embodiment of the present invention, the step S7 is to drop (actual weighing value-weighing set value)/2.

(III) advantageous effects

By adopting the technical scheme of the invention, the automatic weighing control method and the automatic weighing control method for the auxiliary raw material bin for the converter smelting production system adopt the double-benchmark control of the blowing time benchmark and the oxygen quantity benchmark and the control of the auxiliary raw material weighing sequence table to realize the full-automatic control of the auxiliary raw material weighing of the converter; the system forms a control decision according to the actual condition of each furnace steel, automatically produces a weighing control mode, controls the auxiliary raw material weighing machine to execute, and changes the traditional method that the auxiliary raw material weighing of the converter adopts manual or semi-automatic operation; therefore, the operation of the auxiliary raw material system is standardized, standardized and automated, the individual technical level deviation of operators is improved, the integral level of the operation of the auxiliary raw material system of the converter is improved, and the production of the converter is stabilized.

Drawings

In the present invention, like reference numerals refer to like features throughout, wherein:

FIG. 1 is a flow chart of the method of the present invention;

FIG. 2 is a schematic diagram of an automatic weighing control system of a converter auxiliary raw material bin.

Detailed Description

The technical scheme of the invention is further explained by combining the drawings and the embodiment.

With reference to fig. 1, an automatic weighing control method for an auxiliary raw material bin for a converter smelting production system comprises the following steps:

s1, L2 calculates the auxiliary raw material weighing data according to the steel model and the iron receiving data (or the auxiliary gun measuring data), and executes the step S2;

s2, L2 issues the weighing data, judges whether the weighing data needs to be modified, if so, executes the step S3, and if not, executes the step S4;

s3, confirming the data by an operator, modifying the weighing data, sending a data confirmation signal to L2, and executing the step S2;

s4, judging whether the weighing hopper meets the conditions or not, executing a step S5 if the weighing hopper meets the conditions, and executing a step S3 if the weighing hopper does not meet the conditions;

s5, starting the batch weighing, waiting for the set weighing oxygen amount, and executing the step S6;

s6, judging whether the weighing set weight is more than 0, if so, executing a step S7, and if not, executing a step S8;

s7, starting the feeder, judging that the weight-initial weight deviation of the weighing hopper is smaller than the dispersion amount, if the weight-initial weight deviation of the weighing hopper is smaller than the dispersion amount, stopping the weighing feeder, putting the materials into a collecting hopper, adding 1 to the number of the materials weighed in the batch, and executing the step S8;

s8, judging whether the material of the batch is completely added, if so, executing the step S9, and if not, executing the step S6;

s9, waiting for the oxygen converting amount to be larger than the preset oxygen amount or reaching the time, executing the step S10;

and S10, feeding the materials into the converter, and finishing feeding.

The automatic weighing control system for the auxiliary raw material bin for the converter smelting production system comprises batch description, batch state, batch control, material allowance tracking, batch data reasonability judgment, high-level bin management and weighing hopper weighing device weight control.

Firstly, batch description:

ignition charge (F1): it can also be called prior batch, and a batch of material prepared in advance is added into the converter after the start of smelting ignition before the start of smelting after the start of smelting.

Pressing slag: in order to prevent slag from overflowing during the blowing process, a certain amount of slag pressing agent is prepared in advance, 300Kg of material is prepared when the total oxygen is blown to 20%, and if the furnace is not used, the material is used in the next furnace. The batch is prepared automatically only and is added to the converter as determined by the operator.

Feeding in the process: batches of material to be added during the blowing process are required. And setting the corresponding total oxygen blowing flow and the blowing time for each batch, and adding the corresponding batch into the converter when the total oxygen reaches the set value or the blowing time reaches.

And (3) dynamic adjustment: after the sublance temperature measurement sampling analysis is finished, component adjustment may be needed, and in order to respond the calculation result of the model in time, the 7-ton intermediate hopper always keeps about 5.0 tons of ores, but the ores are not automatically fed. And when ore needs to be put in after the sublance is determined, automatically putting in according to a model calculation result, and automatically finishing the material supplementing treatment after the putting in is finished.

Second, batch status

In order to accomplish the effective control and tracking of the batches, each batch has the following states:

batch enable: the batch data is already valid by the rationality judgment but has not yet begun to be processed.

And (3) starting weighing: a set material in a batch begins to enter the weighing process.

And (4) finishing weighing: and weighing all the set materials in the batch.

Waiting for batches: all the materials of the batch are discharged from the weighing hoppers into the corresponding collecting hoppers.

Starting feeding: a set amount of material in a batch was initially charged to the converter.

And (3) finishing the feeding: all the set materials in the batch were added to the converter.

Third, batch control

The batch control table no longer adopts the original static architecture, but adopts a dynamic architecture. That is, 30 materials can be added into each converter smelting period at most, and the 30 materials can be randomly combined into a plurality of batches according to the steel grade requirement. Each material has three setting parameters: a corresponding high-level bin number; corresponding to the material adding amount of the high-level stock bin; and corresponding to the material input time of the high-level bunker, the input time is referred to by the accumulated blowing oxygen amount, if the accumulated blowing oxygen amount is set to be 0, the ignition feeding batch is considered, and the accumulated oxygen amount is set to be the same batch.

The original priority order is cancelled, if a plurality of materials need to be prepared in the corresponding weighing system in the same batch, the materials are prepared according to the size sequence of the bin numbers, and the principle of preparing the materials firstly according to the small bin numbers is followed.

In order to effectively control the batches, the dynamic batch data is effectively managed, and a data queue which looks out of order is converted into an ordered static queue. In order to reduce the burden of PLC mathematical operation, the process computer firstly carries out data sorting before data is issued, and the issuing of dynamic batch data is arranged from small to large according to the set size sequence of the input oxygen quantity. Therefore, when the PLC receives the data, the following search processing is required:

(1) searching for an effective set value: the adding amount of the materials in the high-level bin is more than 0 percent.

(2) Extracting the most prior batches: and according to the material input time corresponding to the effective set value, extracting the material information which is arranged at the forefront of the material information at the same time and the time first.

(3) Matching to an overhead bunker queue: and placing the high-order bin number information corresponding to the effective set value into a correct high-order bin queue, and clearing the data in the receiving area so as to process the next batch after the batch is processed.

(4) The acknowledgement queue processing is complete: when a batch is processed, it is determined whether a next batch is to be processed. If there is a repeat of the previous job, if not the entire batch process is complete.

(5) The control of the whole batch is carried out according to the principle of top to bottom. When a plurality of batches are enabled, the retrieved first batch is controlled, and the material information set by the batch is transmitted to each corresponding high-level bin. And after receiving the set value, the high-level bin performs weighing, and the batch enters a weighing starting state. And when the batch is in a waiting state, searching again, transmitting information of the processed next enabled batch to the corresponding high-level bin, if the weighing of the second batch is finished and the feeding of the previous batch is not finished, not allowing discharging, and waiting all materials in the weighing hopper. The material of the subsequent batch is allowed to be discharged from the weighing hopper only when the previous batch is in the end of charging state. And so on until all the batch tasks are completed.

In the batch processing process, the process calculation can issue correction instructions for multiple times, recalculate the data control information, and the PLC only adjusts the unprocessed data control information.

Fourthly, tracking the allowance of the materials

In order to effectively perform batch control, the weighing hopper and the collecting hopper are tracked, and if materials needing to be prepared already exist in the weighing hopper and the collecting hopper in the process of one heat, correction processing is automatically performed according to the material setting. This is only the case when the set value is greater than or equal to the actual material value.

Fifthly, judging the rationality of batch data

In order to realize effective control of the batches and smoothly implement the control flow, the validity and reasonableness of the data in the batch table must be judged and identified before the data is received.

(1) The set weight of the materials in the high-level stock bin is not more than the upper weighing limit of the corresponding weighing hopper;

(2) if the set weight of the materials in the high-level stock bin is not zero, the set weight of the materials in the high-level stock bin is not less than the effective error of the vibration feeder;

(3) the set volume of the materials in the high-level stock bin is not more than the upper limit of the volume of the corresponding weighing hopper;

(4) the set weight sum of the materials in the high-level storage bin is not more than the upper weighing limit of the corresponding summary hopper;

(5) the total volume of the materials in the high-level stock bin is set to be not more than the upper limit of the volume of the corresponding summary hopper;

(6) setting the total oxygen of batch fed in the process from small to large;

(7) once there is a total oxygen setting for a process batch, there must be an effective material weight setting.

Six, overhead bin management

The types, names and weights of the materials in the high-level bins are effectively managed, and real-time information of the materials in the high-level bins is provided for production.

The actual height of the fill level is displayed by a continuous level indicator.

Actual height (actual detection signal) (upper engineering limit-lower engineering limit)/16

And a high material level alarm point and a low material level alarm point are arranged, and alarm prompt is carried out according to a set value.

And counting the actual weight of the materials in the bin according to the feeding information provided by the raw material conveying system and the actual feeding condition.

Actual weight-actual weight + sigma weight of charge-sigma weight of charge

And calculating the volume ratio of the material to the bin according to the actual weight of the material in the bin, the specific gravity of the material and the actual volume of the bin.

The management of bin types and names, the receiving of the reason codes of the bins from the process computer, can redistribute the emptied bins according to the process requirements.

Seventh, weighing hopper weighing device weight control

The weight control is an important component of the feeding system, and mainly comprises zero point correction of a weighing hopper, actual weight cut out by materials in each high-level bin and the dropping amount.

Zero point correction of weighing hopper

With the long-term use of the equipment, the zero point of the weighing hopper can be shifted due to the reasons of the equipment (bin wall material accumulation, accumulated errors of sensors and the like), so that the weighing precision of the materials and the automatic material preparation control are influenced. For convenience of production and control, zero point deviation can be eliminated in time, and necessary correction processing is carried out on the weight signal collected on site.

Actual display weighing value (actual weight detection signal) (upper engineering limit-lower engineering limit)/16-weight deviation correction value

The weight deviation correction value is less than or equal to 0.5 percent of the actual range of the weighing device

Actual weight cut out of high-level stock bin material:

the actual weight of the cut material is equal to the weight of the weighing hopper after weighing, and the weight of the weighing hopper before weighing

Weighing the hopper before weighing: actual weight of weighing hopper before starting vibration feeder

Weighing the hopper after weighing: actual weight of weighing hopper when vibration feeder stops operating and actual weight of weighing hopper is in steady state

The dropping difference of the high-level bin feeder: amount of fall (actual weighing value-weighing set value)/2

Due to the influence of material characteristics, mechanical characteristics of equipment and environmental factors, how to accurately control the advance of shutdown during material weighing directly influences the weighing precision of the material. The drop amount correction calculation is introduced to effectively correct the error. The previous amount of fall will be the effective parameter for the next weighing control.

The fall compensation calculation is performed only in the automatic mode and in the case where no abnormality occurs in the entire weighing process. The calculation of the amount of other state dropouts is not trusted and meaningful.