CN113549722B - Bell-less blast furnace feeding method, device and system - Google Patents
Bell-less blast furnace feeding method, device and system Download PDFInfo
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- CN113549722B CN113549722B CN202110835627.9A CN202110835627A CN113549722B CN 113549722 B CN113549722 B CN 113549722B CN 202110835627 A CN202110835627 A CN 202110835627A CN 113549722 B CN113549722 B CN 113549722B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/18—Bell-and-hopper arrangements
- C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
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- C21B5/00—Making pig-iron in the blast furnace
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Abstract
The invention discloses a bell-less blast furnace feeding method, a bell-less blast furnace feeding device and a bell-less blast furnace feeding system, wherein the single-tank feeding process in the method comprises the following steps: if the working material tank is an empty tank, the blast furnace control system sends a furnace top material requiring signal to the feeding system; after all the simulated material flows are fed into the tank, sending a full material signal, and starting to distribute materials into the furnace after the material distribution conditions of the material tank are met; if the working material tank is charging, simulating a first preset time after the material flow tail starts to enter the tank, and sending a material demand signal from the top of the furnace; if the working material tank is full, when the material tank meets the material distribution condition and the material flow valve is opened, a material demand signal at the top of the furnace is automatically sent out; and if the working charging bucket is full, but the charging bucket does not meet the material distribution condition, sending a furnace top material requiring signal if the second detection system detects that the material level in the furnace reaches the material line set value. The invention can feed under different working conditions, can improve the operation efficiency of single-tank feeding of the blast furnace, and reduces the influence of insufficient feeding capacity of the single tank of the blast furnace on the production of the blast furnace.
Description
Technical Field
The invention relates to the technical field of ferrous metal smelting and calendaring, in particular to a bell-less blast furnace feeding method, a bell-less blast furnace feeding device and a bell-less blast furnace feeding system.
Background
The raw fuel required by the bell-less parallel-tank blast furnace smelting is conveyed into the charging tank through the conveyer belt, and then the raw fuel is conveyed into the furnace top through the charging tank to execute a one-coke one-ore charging system, wherein the length of the conveyer belt of the blast furnace in the prior art is 361m, the speed of the belt is 2m/s, and the width of the belt is 1.4m. The blast furnace feeding mode is divided into two modes of double-tank feeding (two charging tanks feed to the furnace top in turn) and single-tank feeding (only one charging tank feeds to the furnace top) according to the operation condition of equipment.
According to statistics of the charging condition of the blast furnace in 2018, when the blast furnace is in normal production (namely double-tank charging), the number of hourly batches is about 8.5 batches (1 batch is formed by charging 1 coke and 1 ore in each top charging tank); when furnace top equipment breaks down, single-tank feeding is forced to be used, the number of small batches is about 6.4, and is only 75.3% of that in a normal mode, and the operation efficiency is low. Therefore, 4 times of low stockline accidents of three blast furnaces of an iron works are caused by accumulation in the feeding process of a single tank all the year round, and the influence on the production of the blast furnaces is great due to multiple times of air reduction; meanwhile, the device brings great pressure to the maintenance and overhaul work of the device.
Therefore, how to improve the single-tank feeding operation efficiency is a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of the above, the present invention provides a bell-less blast furnace charging method, and a corresponding apparatus and system, so as to improve the operation efficiency of blast furnace single-tank charging, thereby reducing the influence of insufficient charging capability of the blast furnace single-tank on the production of the blast furnace.
In order to achieve the purpose, the invention provides the following technical scheme:
the bell-less blast furnace charging method comprises a single-tank charging process, wherein the single-tank charging process comprises the following steps:
the first material preparation process comprises the following steps: if the first detection system detects that the working material tank is an empty tank, the blast furnace control system sends a furnace top material requiring signal to the feeding system;
the feeding process comprises the following steps: after the feeding system receives the furnace top material demand signal, the stub bar of the simulated material flow gradually moves to a belt head wheel from a starting point, and the time consumed by the simulated material flow gradually running to a preset point after the working material tank meets the material loading condition in the process is the material loading allowance time t1;
the tank filling process comprises: the material head of the simulated material flow is fed into the tank from the beginning until the material tail of the simulated material flow is fed into the tank completely, and the time consumed in the process is as long as the charging time t2;
and (3) material distribution: after all the simulated material flows are fed into the tank, sending a full-material signal, and starting to distribute materials into the furnace after the material distribution conditions of the charging tank are met;
the second material preparation process comprises the following steps: in the charging process of the working charging bucket, when the material tail of the simulated material flow starts to enter the bucket and waits for a first preset time t3, a material demand signal of the furnace top is sent out;
the third material preparation process: if the working material tank is in a full-material state, when the working material tank meets the material distribution condition and the material flow valve is opened, sending a material demand signal from the furnace top;
the fourth material requiring process: if the working material tank is in a full-material state but the working material tank does not meet the material distribution condition, at the moment, if a second detection system detects that the charge level in the furnace reaches a charge line set value, a material requiring signal at the furnace top is sent;
and the sending time interval of the furnace top material feeding signals is longer than the discharging allowable time of the middle hopper.
Optionally, in the bell-less blast furnace charging method, an actual occurrence value of the charging rich time t1 is monitored by a monitoring system, and if the actual occurrence value of the charging rich time t1 increases by t 'relative to a preset charging rich time value, the first preset time period t3 is adjusted to decrease by t'; and if the actual occurrence value of the feeding slack time t1 is reduced by t 'relative to the preset value of the feeding slack time, adjusting the first preset time period t3 and increasing t'.
Optionally, in the bell-less blast furnace charging method, the second detection system is a probe, and the probe is used for lifting the probe after detecting that the charge level in the furnace reaches or is lower than the first preset position L1.
Optionally, in the bell-less blast furnace charging method, the number of turns of material distribution in the blast furnace is a first set value in the double-tank charging process;
and in the single-tank feeding process, the number of distribution turns in the blast furnace is a second set value, and the second set value is reduced by one turn relative to the first set value.
Optionally, in the bell-less blast furnace charging method, during the single-tank charging process:
cutting off the function of opening the material flow valve of the working material tank;
and/or, cutting off the function of the swirl step angle.
The utility model provides a bell-less blast furnace loading attachment, includes operation display module and control module, wherein:
the control module is used for executing the bell-less blast furnace feeding method;
the operation display module is provided with a furnace top single-tank mode input button for controlling the starting of the single-tank feeding process and a furnace top single-tank mode cut-off button for controlling the closing of the single-tank feeding process.
Optionally, in the above bell-less blast furnace charging device, the operation display module is further provided with:
the first material flow valve large opening function selecting button is used for controlling the starting of a first material flow valve large opening function of a first material tank, and the first material flow valve large opening function removing button is used for controlling the closing of the first material flow valve large opening function;
the button is selected by the second material flow valve large opening function used for controlling the second material flow valve large opening function of the second material tank to be started, and the button is cut off by the second material flow valve large opening function used for controlling the second material flow valve large opening function to be closed.
Optionally, in the above bell-less blast furnace charging device, the operation display module is further provided with:
a rotating step angle function input button for controlling the starting of the rotating step angle function and a rotating step angle function cut-off button for controlling the closing of the rotating step angle function.
A bell-less blast furnace feeding system comprises an intermediate hopper, a conveying belt, a charging bucket, a blast furnace and a blast furnace control system for executing the bell-less blast furnace feeding method.
Optionally, in the bell-less blast furnace charging system, a buffer is arranged in the middle hopper, the buffer is an annular baffle plate arranged close to a feed opening of the middle hopper, and the thickness of the annular baffle plate is gradually increased from an inner ring to an outer ring.
According to the technical scheme, the bell-less blast furnace feeding method, the bell-less blast furnace feeding device and the bell-less blast furnace feeding system provided by the invention are provided with a set of independent single-tank feeding process. That is, the invention designs a set of independent single-tank material-requiring control program for the bell-less and tank-type blast furnace, can send out 'the material-requiring signal at the top' in the charging process, the material-distributing process and the empty condition of the material tank, ensures that the material-requiring signal at the top is sent out in time when the single tank is charged, improves the charging efficiency and further improves the operation efficiency of the system.
Actual production results prove that the operating efficiency of the charging of the single tank of the blast furnace is improved from 75.3% to about 95.4% after the bell-less blast furnace charging method, the bell-less blast furnace charging device and the bell-less blast furnace charging system are implemented. Therefore, when furnace top equipment fails, the single-tank charging process in the bell-less blast furnace charging method is used in time, so that the occurrence of production accidents such as low stockline and wind reduction of the blast furnace can be reduced, the maintenance and overhaul pressure of the furnace top equipment can be reduced, and great significance is brought to the stable and smooth operation of the blast furnace.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a charging system of a bell-less blast furnace according to a second embodiment of the present invention;
fig. 2 is a schematic structural view of an improved middle hopper according to a second embodiment of the present invention;
FIG. 3 is a diagram of a single-tank loading control operation interface according to a second embodiment of the present invention;
fig. 4 is a diagram illustrating an improved operation of the exhaust valve control according to the second embodiment of the present invention.
Detailed Description
First embodiment
In contrast, the first embodiment of the present invention provides a bell-less blast furnace charging method, which includes a double-tank charging process and a single-tank charging process.
In the double-tank feeding process, the material is distributed in the blast furnace through the two material tank wheels, when any material tank is empty, an empty point signal is sent, the blast furnace control system can send a furnace top material demanding signal to the feeding system, so that the middle hopper in the feeding system discharges materials to the conveying belt (namely, the main belt), and the conveying belt conveys the materials into the empty material tank.
When a certain charging bucket breaks down, only one charging bucket is used as a working charging bucket to supply materials to the blast furnace, namely, single-bucket feeding is carried out, and the working process is as follows: the material is distributed into the blast furnace through the working material tank, when the material in the working material tank is exhausted, the blast furnace control system sends a furnace top material demand signal to the feeding system, and then the material is conveyed into the empty tank through the feeding system.
Through repeatedly testing each time node in the charging process of the bell-less blast furnace, the following problems are summarized:
1) A complete set of material control program is not designed for single-tank feeding: the program design is mainly based on the furnace top and tank type feeding (namely double-tank feeding) mode for control, and an independent single-tank material demanding control program is not designed for the single-tank feeding mode. Thereby causing the single-tank feeding and the double-tank feeding to use the same set of material control program. Therefore, when the single tank is charged, after the conditions of the empty point signal sending of the charging tank and the like are met, the program can automatically send a charging signal, the middle hopper can discharge materials to the conveying belt, and therefore the charging waiting time of the furnace top charging tank is directly longer, and the charging efficiency of the single tank is greatly reduced.
2) The chain waiting time of each level of equipment is long: the chain stopping point of the 'stub bar OK' of the conveyer belt is arranged far away; the set value of the number of turns of cloth is large; rotating the stepping angle without cutting off; and after the material distribution of the charging bucket is finished, the material flow valve can be automatically closed only by carrying out full opening.
3) The comprehensive utilization rate of part of equipment is low: the opening degree of the gates of the ore intermediate hopper and the coke intermediate hopper is small, so that the discharge time is long; slow valve action of the furnace top charging bucket and the like.
Second embodiment
The invention specifically discloses a bell-less blast furnace feeding method, a corresponding device and a corresponding system, so as to improve the operation efficiency of blast furnace single-tank feeding and reduce the influence of the insufficient feeding capacity of the blast furnace single tank on the production of the blast furnace.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a bell-less blast furnace charging system according to a second embodiment of the present invention includes an intermediate hopper 1, a conveyor 2, a first charging bucket 31, a second charging bucket 32, a blast furnace 4, and a blast furnace control system for performing a bell-less blast furnace charging method. Wherein: the middle hopper 1 is used for discharging materials to the conveying belt 2, the conveying belt 2 is used for conveying materials into the first material tank 31 and the second material tank 32, the first material tank 31 and the second material tank 32 are used for distributing materials into the blast furnace 4, the blast furnace 4 can smelt the materials in the furnace, and in the smelting process, solid materials are gradually changed into liquid.
As shown in fig. 1, if the second material tank 32 fails, distributing the material into the blast furnace through the first material tank 31 only (at this time, the second material tank 32 is shut down, and the first material tank 31 is a working material tank), and the blast furnace control system performs a single-tank loading process in the bell-less blast furnace loading method; similarly, if the first material tank 31 fails, the material is distributed into the blast furnace only through the second material tank 32 (at this time, the first material tank 31 is shut down, and the second material tank 32 is a working material tank), and the blast furnace control system executes the single-tank loading process in the bell-less blast furnace loading method.
Specifically, this single jar material loading process includes:
the first material preparation process comprises the following steps: if the first detection system detects that the working material tank is an empty tank, the blast furnace control system sends a furnace top material requiring signal to the feeding system, and the first material requiring mode is adopted;
the feeding process comprises the following steps: after a feeding system receives a furnace top material feeding signal, a stub bar of a simulated material flow is gradually moved to a belt head wheel from a starting point, and in the process, when a working material tank meets a material feeding condition, the time consumed for the simulated material flow to gradually run to a preset point (namely a stub bar OK detection point) is as long as a feeding allowance time t1;
the tank filling process comprises: the material head of the simulated material flow is fed into the tank from the beginning until the material tail of the simulated material flow is fed into the tank completely, and the time consumed in the process is the charging time t2;
and (3) material distribution: after all the simulated material flows are fed into the tank, sending a full material signal, and starting to distribute materials into the furnace after the material distribution conditions of the material tank are met;
the second material preparation process: in the charging process of the working charging bucket, when the tail of the simulated material flow starts to enter the bucket and waits for a first preset time t3, a furnace top material feeding signal is sent, and the second material feeding mode is adopted;
a third material requiring process: if the working material tank is in a full-material state, when the working material tank meets the material distribution condition and the material flow valve is opened, a material requiring signal at the top of the furnace is sent, which is a third material requiring mode; (ii) a
The fourth material requiring process: if the working material tank is in a full-material state but the working material tank does not meet the material distribution condition, at the moment, if the second detection system detects that the material level in the furnace reaches the material line set value, a furnace top material requiring signal is sent, and the fourth material requiring mode is adopted;
wherein, in order to prevent repeated feeding, the feeding interval time must be longer than the discharging allowable time of the middle hopper.
Therefore, based on the above four single-tank material feeding modes, the material can be fed under different working conditions in the single-tank feeding process of the bell-less blast furnace feeding method provided by the second embodiment of the invention.
Moreover, it should be noted that, in the third material feeding process, since it is not necessary to wait for the first preset time period t3, a furnace top material feeding signal is sent in advance, so that the functions of shortening the material feeding waiting delay time (i.e. shortening the second delay time), feeding in advance, supplementing material in time, and preventing the material level in the furnace from being too low can be achieved.
That is to say, in general, all tails of the simulated material flow enter the tank and wait for the first preset time t3, and then the top material supply signal is sent again; and if the charge level in the furnace reaches or is lower than the first preset position L1, sending a furnace top charge signal in advance. That is, even if the waiting time after all the tails of the simulated material flow enter the tank does not reach t3, as long as the charge level in the furnace reaches or is lower than the first preset position L1, the blast furnace control system sends a furnace top material supply signal to the feeding system, so as to shorten the delay time of the charging waiting (i.e. shorten the second delay time), advance the feeding, and timely supplement the material, so as to prevent the charge level in the furnace from being too low.
Specifically, in order to further optimize the above technical solution, in the above single-tank feeding process, the actual occurrence value of the feeding rich time t1 is monitored by a monitoring system:
if the actual occurrence value of the feeding surplus time t1 is increased by t 'relative to the preset value of the feeding surplus time, adjusting the first preset time t3 and reducing t';
if the actual occurrence of the charge rich time t1 is reduced by t "from the preset value of the charge rich time, the first preset time period t3 is adjusted to be increased by t".
During specific implementation, the specific value of the first preset time t3 can be manually adjusted through the operation interface, and can also be automatically adjusted through the control system.
It should be noted that the "feeding system" referred to herein includes the intermediate hopper 1, the conveyor belt 2, and the feeding control system, and if the blast furnace control system sends a furnace top material supply signal to the feeding system, the intermediate hopper 1 discharges the material to the conveyor belt 2, and the conveyor belt 2 sends the material to the working material tank.
In a specific implementation, the second detection system is a probe, and the charge level in the furnace is monitored by the probe (for example, a gamma ray level gauge). In the single-tank material distribution process, when the stock rod tracks that the material level in the furnace reaches or is lower than a first preset position L1, the stock rod is lifted, and then the blast furnace control system sends a furnace top material demand signal. The height distance from the first preset position L1 to the zero position (reference point) is called a "stockline" and is set by a post operator according to the furnace condition. For example, the stock line is set to be 2m, after the materials are loaded into the furnace, the materials gradually descend under the smelting of the blast furnace, the distance between the material surface and the zero point position of the materials gradually increases, and when the height value of the distance reaches 2m, the materials reach the stock line, and the lifting rule condition is met.
It should be noted that the bell-less blast furnace charging method according to the second embodiment of the present invention generally performs a two-tank charging process, which can be referred to the first embodiment. And when a certain material tank is in failure or under other special conditions, executing a single-tank feeding process.
Specifically, the set value of the number of turns of cloth in the single-tank feeding process is smaller than the set value of the number of turns of cloth in the double-tank feeding process. For example, in the double-tank feeding process, the number of turns of material distribution in the blast furnace is a first set value; and in the single-tank feeding process, the number of the distribution turns in the blast furnace is a second set value, and the second set value is reduced by one turn relative to the first set value. That is, the set value of the number of turns of cloth in the single-tank feeding process is 1 turn less than the set value of the number of turns of cloth in the double-tank feeding control process. During specific implementation, the adjustment of the number of turns of the cloth can be realized by adjusting the opening degree of the throttle valve.
Specifically, in the single-tank feeding process, the function of opening the material flow valve of the working material tank greatly and the function of cutting the rotating stepping angle are needed to be cut off.
In summary, compared with the technical scheme that the material demanding signal is sent only after the material tank empty point signal is sent in the first embodiment, the material loading method for the bell-less blast furnace provided in the second embodiment of the present invention designs an independent single-tank material demanding control program for a bell-less and tank-type blast furnace to realize the single-tank material loading process, which provides a plurality of single-tank material loading conditions (i.e., the first material demanding process, the second material demanding process, and the third material demanding process), and when any one of the conditions occurs, the material loading process can be started, so that the material loading efficiency is improved, and the system operation efficiency is improved.
That is to say, the bell-less blast furnace charging method provided by the second embodiment of the present invention can send "a furnace top charging signal" in the charging process, the distributing process and the empty charging tank, and ensure that the furnace top charging signal is sent out in time when a single tank is charged, so as to improve the charging efficiency, thereby improving the system operation efficiency.
The practical production results prove that the operating efficiency of the charging of the single tank of the blast furnace is improved from 75.3% to about 95.4% after the bell-less blast furnace charging method provided by the invention is implemented. Therefore, when furnace top equipment fails, the single-tank charging process in the bell-less blast furnace charging method is used in time, so that the occurrence of production accidents such as low stockline and wind reduction of the blast furnace can be reduced, the maintenance and overhaul pressure of the furnace top equipment can be reduced, and great significance is brought to the stable and smooth operation of the blast furnace.
In addition, the second embodiment of the present invention further provides a bell-less blast furnace charging device, which includes an operation display module and a control module, wherein:
the control module is used for executing the bell-less blast furnace feeding method;
the operation display module is provided with a furnace top single-tank mode input button for controlling the starting of the single-tank feeding process and a furnace top single-tank mode cut-off button for controlling the closing of the single-tank feeding process. See in particular fig. 3.
Further, the operation display module is also provided with:
the material distribution device comprises a first material flow valve large opening function selection button used for controlling the starting of a first material flow valve large opening function of a first material tank and a first material flow valve large opening function removal button used for controlling the closing of the first material flow valve large opening function, wherein the first material flow valve large opening means that the first material tank is opened after being emptied, and the first material flow valve can be automatically closed only by executing full opening after the material distribution of the first material tank is finished;
the second material flow valve large opening function selecting button is used for controlling the starting of a second material flow valve large opening function of a second material tank, and the second material flow valve large opening function removing button is used for controlling the closing of the second material flow valve large opening function, wherein the second material flow valve large opening means that the second material tank is opened after being emptied, and the second material flow valve can be automatically closed only by executing full opening after the material distribution of the second material tank is finished;
a rotating step angle function throw-in button for controlling the turning-on of the rotating step angle function, and a rotating step angle function cut-out button for controlling the turning-off of the rotating step angle function.
In summary, the second embodiment of the present invention further provides a bell-less blast furnace charging system, which includes an intermediate hopper, a conveyor belt, a charging bucket, a blast furnace, and a blast furnace control system for executing the bell-less blast furnace charging method.
Specifically, a buffer is arranged in the middle hopper, and the buffer is an annular baffle arranged close to a feed opening of the middle hopper.
Specifically, the thickness of the annular baffle plate gradually increases from the inner ring to the outer ring.
Specifically, the charging bucket of the blast furnace main body is provided with a double-pressure-discharge valve. In specific implementation, please refer to fig. 2, fig. 2 is a diagram of an improved operation of pressure relief valve control according to a second embodiment of the present invention, which is mainly used for selectively controlling two pressure relief valves and two pressure equalizing valves of a charging bucket. When a single tank is charged, a 'pressure relief valve' or a 'pressure equalizing valve' needs to be selected to work simultaneously.
The buffer is additionally arranged at the discharge port of the middle hopper, so that the discharge port can be prevented from being excessively worn, materials can be concentrated in the middle of the discharge port, and material blockage caused when the gate is closed can be avoided. The opening of the manual gate valve of the middle bucket can be improved to more than 90% from 80% through improvement, so that the discharge time can be greatly shortened. In addition, the pressure discharge mode of the charging bucket is changed from a single pressure discharge valve to a double pressure discharge valve. It should be noted that, in general, each charging bucket of the blast furnace is provided with two pressure discharge valves, and the two pressure discharge valves are used for one standby in design, so that the pressure discharge time is shortened.
In summary, the bell-less blast furnace charging method, device and system provided by the embodiment of the invention have the following advantages:
(1) The method for charging the single tank of the blast furnace has richer charging modes, and can send out a furnace top charging signal in the charging process, the material distribution process and the empty condition of the charging tank, so that the operating efficiency of single tank charging can be improved in the aspect of software.
(2) The interlocking of equipment action and the improvement equipment comprehensive utilization rate in the single-tank feeding process are simplified, so that the operating efficiency of single-tank feeding can be improved in the aspect of hardware.
(3) The operation efficiency of the blast furnace single-tank charging is improved from 75.3% to about 95.4% after the application of the invention. Therefore, when furnace top equipment fails, the single-tank feeding is timely used, so that the occurrence of production accidents such as low stockline and wind reduction of the blast furnace can be reduced, the maintenance and overhaul pressure of the furnace top equipment can be reduced, and great significance is brought to the stable and smooth operation of the blast furnace.
(4) The invention has small investment, large return and easy implementation.
Finally, it should also be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The bell-less blast furnace feeding method is characterized by comprising a single-tank feeding process, wherein the single-tank feeding process comprises the following steps:
the first material preparation process comprises the following steps: if the first detection system detects that the working material tank is an empty tank, the blast furnace control system sends a furnace top material requiring signal to the feeding system;
the feeding process comprises the following steps: after the feeding system receives the furnace top material demand signal, the stub bar of the simulated material flow gradually moves to a belt head wheel from a starting point, and in the process, after the working material tank meets the material charging condition, the time consumed by the simulated material flow gradually running to a preset point is the material charging allowance time t1;
the tank filling process comprises: the material head of the simulated material flow is fed into the tank from the beginning until the material tail of the simulated material flow is fed into the tank completely, and the time consumed in the process is as long as the charging time t2;
and (3) material distribution: after all the simulated material flows are fed into the tank, sending a full material signal, and starting to distribute materials into the furnace after the material distribution conditions of the material tank are met;
the second material preparation process comprises the following steps: in the charging process of the working charging bucket, when the material tail of the simulated material flow starts to enter the bucket and waits for a first preset time t3, a material demand signal of the furnace top is sent out;
the third material preparation process: if the working material tank is in a full-material state, when the working material tank meets the material distribution condition and the material flow valve is opened, sending a material demand signal from the top of the furnace;
the fourth material requiring process: if the working material tank is in a full-material state but the working material tank does not meet the material distribution condition, at the moment, if a second detection system detects that the material level in the furnace reaches a material line set value, sending a material requiring signal from the top of the furnace;
the sending time interval of the furnace top material feeding signals is longer than the discharging allowable time of the middle hopper;
the single-tank feeding process comprises the following steps:
cutting off the function of opening the material flow valve of the working material tank;
and/or, cutting off the function of the swirl step angle.
2. The bell-less blast furnace charging method according to claim 1, wherein the actual occurrence value of the charging rich time t1 is monitored by a monitoring system, and if the actual occurrence value of the charging rich time t1 is increased by t 'from the charging rich time preset value, the first preset time period t3 is adjusted to be decreased by t'; and if the actual occurrence value of the feeding rich time t1 is reduced by t "relative to the preset value of the feeding rich time, adjusting the first preset time t3 and increasing t".
3. The bell-less blast furnace charging method according to claim 1, wherein the second detection system is a probe, and the probe detects that the charge level in the furnace reaches or is lower than a first preset position L1 and then lifts the rod.
4. The bell-less blast furnace charging method according to claim 1, wherein the number of distribution turns in the blast furnace is a first set value during the double-tank charging process;
and in the single-tank feeding process, the number of distribution turns in the blast furnace is a second set value, and the second set value is reduced by one turn relative to the first set value.
5. The utility model provides a no bell blast furnace loading attachment which characterized in that, includes operation display module and control module, wherein:
the control module is used for executing the bell-less blast furnace charging method of any one of claims 1 to 4;
the operation display module is provided with a furnace top single-tank mode input button for controlling the starting of the single-tank feeding process and a furnace top single-tank mode cut-off button for controlling the closing of the single-tank feeding process.
6. The bell-less blast furnace charging device according to claim 5, wherein the operation display module is further provided with:
the first material flow valve large opening function selecting button is used for controlling the starting of a first material flow valve large opening function of a first material tank, and the first material flow valve large opening function removing button is used for controlling the closing of the first material flow valve large opening function;
the button is selected by the second material flow valve large opening function used for controlling the second material flow valve large opening function of the second material tank to be started, and the button is cut off by the second material flow valve large opening function used for controlling the second material flow valve large opening function to be closed.
7. The bell-less blast furnace charging device according to claim 5, wherein the operation display module is further provided with:
a rotating step angle function switching-in button for controlling the starting of the rotating step angle function, and a rotating step angle function cutting-out button for controlling the closing of the rotating step angle function.
8. A bell-less blast furnace charging system, which is characterized by comprising an intermediate hopper, a conveyer belt, a charging bucket, a blast furnace and a blast furnace control system for executing the bell-less blast furnace charging method according to any one of claims 1 to 4.
9. The bell-less blast furnace charging system of claim 8, wherein a buffer is arranged in the middle hopper, the buffer is an annular baffle arranged close to the feed opening of the middle hopper, and the thickness of the annular baffle is gradually increased from the inner ring to the outer ring.
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| CN101709340B (en) * | 2009-10-30 | 2012-05-09 | 宝钢集团新疆八一钢铁有限公司 | Single-bucket serial-bucket charging method applied to bell-free blast furnaces |
| CN102096404B (en) * | 2010-12-31 | 2013-11-20 | 中冶南方工程技术有限公司 | Bell-less string tank furnace top charging material software tracker and control method thereof |
| CN105483301B (en) * | 2015-12-01 | 2017-06-13 | 中冶南方工程技术有限公司 | Charging of blast furnace charge personal distance control method |
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