CN116697730A - Automatic control method and device for drying furnace of blast furnace coal injection system - Google Patents
Automatic control method and device for drying furnace of blast furnace coal injection system Download PDFInfo
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- CN116697730A CN116697730A CN202310681272.1A CN202310681272A CN116697730A CN 116697730 A CN116697730 A CN 116697730A CN 202310681272 A CN202310681272 A CN 202310681272A CN 116697730 A CN116697730 A CN 116697730A
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- 238000001035 drying Methods 0.000 title claims abstract description 155
- 239000003245 coal Substances 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000002347 injection Methods 0.000 title claims abstract description 34
- 239000007924 injection Substances 0.000 title claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 219
- 230000001105 regulatory effect Effects 0.000 claims abstract description 104
- 239000000843 powder Substances 0.000 claims abstract description 45
- 239000000571 coke Substances 0.000 claims abstract description 39
- 230000001276 controlling effect Effects 0.000 claims abstract description 29
- 238000010298 pulverizing process Methods 0.000 claims abstract description 24
- 238000002360 preparation method Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 239000002912 waste gas Substances 0.000 claims abstract description 6
- 238000002485 combustion reaction Methods 0.000 claims description 61
- 238000004321 preservation Methods 0.000 claims description 15
- 238000009792 diffusion process Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 8
- 230000000740 bleeding effect Effects 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/238—Flow rate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/242—Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/305—Control of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/355—Control of heat-generating means in heaters
- F24H15/36—Control of heat-generating means in heaters of burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/40—Control of fluid heaters characterised by the type of controllers
- F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
- F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/025—Air heaters with forced circulation using fluid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
- F24H9/2085—Arrangement or mounting of control or safety devices for air heaters using fluid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Fluid Mechanics (AREA)
- Computer Hardware Design (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention provides an automatic control method and device for a drying furnace of a blast furnace coal injection system, and belongs to the technical field of coal injection and powder preparation of blast furnaces. The method comprises the steps of detecting a coke oven gas pipeline; determining an ignition program according to the detection result of the coke oven gas pipeline; acquiring a first flow, a first opening, a first temperature, a second temperature, a third temperature and a first pressure; determining a combustion program according to the regulating valve characteristic relation of the first opening and the first flow so as to enable the first temperature to be in a temperature threshold range; determining the opening degree of an air door actuator of the waste gas induced draft fan according to the first pressure so that the first pressure is within a furnace chamber pressure threshold range of the drying furnace; and controlling the second temperature within a preset range of the inlet temperature of the coal mill and controlling the third temperature within a preset range of the outlet temperature of the coal mill according to the current combustion program. The invention avoids system fluctuation caused by manual operation and improves the quality of the coal powder produced by the pulverizing system.
Description
Technical Field
The invention relates to the technical field of blast furnace coal injection systems, in particular to an automatic control method and device for a drying furnace of a blast furnace coal injection system.
Background
In the ferrous metallurgy industry, the blast furnace coal injection process is the most efficient process technology for providing fuel for blast furnace ironmaking. The process is a reasonable choice for the progress of blast furnace smelting technology, can not only reduce coke consumption and improve economic benefit and keep the stability and continuity of coal injection flow, but also be used as an adjusting means for improving the blast furnace condition.
In order to ensure stable and continuous coal flow, besides stable control of the injection system, the fineness, temperature and water content of the coal powder are also important influencing factors. At present, the powder process mainly mixes high-temperature flue gas generated after blast furnace gas and combustion air are combusted in a drying furnace with hot blast furnace waste gas to form inert hot gas suitable for drying pulverized coal. However, the means for controlling the drying furnace area is mainly controlled manually and remotely, which causes frequent fluctuation of the furnace temperature and furnace pressure of the drying furnace under the influence of multiple variables, and affects the stable operation of the pulverizing system.
For this problem, after experienced operators are familiar with the relevant adjustment mode, the fluctuation generated is less controllable; operators with less operation experience basically do not have the capabilities of furnace ignition, furnace temperature control and furnace pressure control, so that the prepared coal powder has high humidity and high viscosity, and is unsmooth in injection and even pipe blockage caused in the pneumatic conveying process, thereby seriously affecting the stable operation of the blast furnace and bringing about certain economic loss.
Therefore, in order to improve the stable blowing capability of the coal injection system, the automatic stable adjustment of the coal pulverizing system is particularly important, the related equipment and valves in the drying furnace area are accurately controlled, and the automatic control capability of the drying furnace is improved to be the problem to be solved at present.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide an automatic control method and apparatus for a drying furnace of a blast furnace coal injection system, so as to solve at least one of the above-mentioned problems.
In a first aspect, the invention provides an automatic control method for a drying furnace of a blast furnace coal injection system, comprising the following steps:
detecting a coke oven gas pipeline;
determining an ignition program according to the detection result of the coke oven gas pipeline;
acquiring a first flow, a first opening, a first temperature, a second temperature, a third temperature and a first pressure, wherein the first flow is real-time flow of blast furnace gas, the first opening is real-time opening of a blast furnace gas flow regulating valve, the first temperature is real-time temperature of a drying furnace hearth, the second temperature is real-time temperature of a coal mill inlet, the third temperature is real-time temperature of a coal mill outlet, and the first pressure is real-time pressure of the drying furnace hearth;
Determining a combustion program according to the corresponding relation between the first opening and the first flow so as to enable the first temperature to be in a temperature threshold range;
determining the opening degree of an air door actuator of the waste gas induced draft fan according to the first pressure so that the first pressure is within a furnace chamber pressure threshold range of the drying furnace;
and controlling the second temperature within a preset range of the inlet temperature of the coal mill and controlling the third temperature within a preset range of the outlet temperature of the coal mill according to the current combustion program.
In an embodiment of the present invention, the determining the ignition procedure according to the detection result of the coke oven gas pipeline includes:
the ignition program comprises a first ignition program and a second ignition program;
when no coke oven gas pipeline is detected, selecting the first ignition program, and inputting blast furnace gas to finish ignition;
and when the coke oven gas pipeline is detected, selecting the second ignition program, and inputting coke oven gas to finish ignition.
In an embodiment of the present invention, the determining the combustion program according to the correspondence between the first opening and the first flow rate so that the first temperature is within a temperature threshold range includes:
The combustion process includes a first combustion process;
when the corresponding relation accords with a valve flow characteristic curve, selecting the first combustion program;
and adjusting the opening of the blast furnace gas flow regulating valve through a first controller to control the flow of the blast furnace gas entering the drying furnace, so that the first temperature is within the temperature threshold range.
In an embodiment of the present invention, the determining the combustion program according to the correspondence between the first opening and the first flow rate so that the first temperature is within a temperature threshold range includes:
the combustion process includes a second combustion process;
when the corresponding relation does not accord with the valve flow characteristic curve, selecting the second combustion program;
and adjusting the opening of the blast furnace gas flow regulating valve through a second controller so as to control the flow of the blast furnace gas entering the drying furnace, so that the first temperature is within the temperature threshold range.
In an embodiment of the present invention, the determining the combustion program according to the correspondence between the first opening and the first flow rate so that the first temperature is within a temperature threshold range includes:
when the temperature is in the heat preservation stage, the temperature threshold value comprises the heat preservation temperature of the drying furnace and the upper limit of the diffusion temperature of the drying furnace;
When in the warm mill phase, the temperature threshold includes an upper dryer warm mill temperature limit and a lower dryer warm mill temperature limit.
In an embodiment of the present invention, the controlling the second temperature within the preset range of the inlet temperature of the coal mill and the controlling the third temperature within the preset range of the outlet temperature of the coal mill according to the current combustion process includes:
when the current combustion model is the first combustion program, controlling the blast furnace gas flow entering the drying furnace through the first controller so as to control the second temperature within a preset range of the inlet temperature of the coal mill and control the third temperature within a preset range of the outlet temperature of the coal mill;
and when the current combustion model is the second combustion program, controlling the blast furnace gas flow entering the drying furnace through the second controller so as to control the second temperature within a preset range of the inlet temperature of the coal mill and control the third temperature within a preset range of the outlet temperature of the coal mill.
In an embodiment of the present invention, when the current combustion model is the first combustion program, the method further includes, after controlling, by the first controller, the flow rate of the blast furnace gas into the drying furnace to control the second temperature within a preset range of coal mill inlet temperatures and to control the third temperature within a preset range of coal mill outlet temperatures:
Dividing the pulverizing quantity into N pulverizing grades according to the pulverizing capacity of equipment, wherein each pulverizing grade is provided with corresponding blast furnace gas flow;
acquiring a first powder preparation amount, wherein the first powder preparation amount is real-time powder preparation amount of a blast furnace powder preparation system;
determining the pulverizing grade according to the first pulverizing quantity;
setting the blast furnace gas flow rate regulated by the first controller as the blast furnace gas flow rate set flow rate of the pulverizing grade, and taking the blast furnace gas flow rate as the initial blast furnace gas target flow rate of the next pulverizing.
In an embodiment of the invention, after determining the ignition procedure according to the detection result of the coke oven gas pipeline, the method further includes:
detecting a display lamp of the flame detector; if the display lamp is detected to be on, the ignition is successful, and the combustion program is implemented;
if the display lamp is not detected to be on, the ignition fails, and the ignition procedure is repeated until the display lamp is detected to be on.
In a second aspect, the invention also provides an automatic control device for a drying furnace of a blast furnace coal injection system, comprising:
the detection module is used for detecting whether a coke oven gas pipeline exists or not;
the ignition module is used for determining an ignition program according to the detection result of the coke oven gas pipeline;
The acquisition module is used for acquiring a first flow, a first opening, a first temperature, a first pressure and a first powder preparation amount;
the combustion module is used for determining a combustion program according to the corresponding relation between the first flow and the first opening;
the control module is used for controlling the first temperature to be in a temperature threshold range, controlling the opening of an exhaust gas induced draft fan air door actuator to enable the first pressure to be in a drying furnace hearth pressure threshold range, controlling the second temperature to be in a coal mill inlet temperature preset value range and controlling the third temperature to be in a coal mill outlet temperature preset value range.
The invention has the beneficial effects that:
the invention provides an automatic control method and device for a drying furnace of a blast furnace coal injection system, wherein the method completes ignition and combustion of the drying furnace through an ignition program and a combustion program, and controls the hearth pressure of the drying furnace by controlling the opening of an air door regulating valve of an exhaust gas induced draft fan, so that the hearth temperature and the hearth pressure of the drying furnace can be quickly and accurately regulated, system fluctuation caused by manual operation is avoided, and automation of blast furnace gas combustion is realized; and the data is provided for the subsequent powder preparation by acquiring the first powder preparation amount and determining the blast furnace gas set flow, so that the reliability of coal injection is improved, and the quality of the coal powder prepared by the powder preparation system is further improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
FIG. 1 is a schematic diagram of an apparatus for a kiln region according to an exemplary embodiment of the present invention;
FIG. 2 is a flow chart of a method for automatically controlling a drying furnace of a coal injection system of a blast furnace according to an exemplary embodiment of the present invention;
FIG. 3 shows a valve flow characteristic curve according to an exemplary embodiment of the present invention;
fig. 4 is a block diagram of an automatic control apparatus for a blast furnace coal injection system drying furnace according to an exemplary embodiment of the present invention.
Description of the part reference numerals
1-a drying furnace; 2-blast furnace gas flow cut-off valve; 3-a blast furnace gas flow regulating valve; 4-a coke oven gas flow cut-off valve; 5-a coke oven gas flow regulating valve; 6-a combustion-supporting fan; 7-a drying furnace bleeding valve; 8-an exhaust gas induced draft fan air door actuator; 9-a combustion air flow regulating valve; 10-waste gas induced draft fan.
Detailed description of the preferred embodiments
Further advantages and effects of the present invention will become readily apparent to those skilled in the art from the present disclosure, by referring to the following drawings and preferred embodiments. The invention may be embodied or practiced in other embodiments that depart from the specific details disclosed herein and that may be modified or varied from the spirit and scope of the present invention. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.
It should be noted that, the drawings provided in the following embodiments merely illustrate the basic concept of the present invention by a schematic procedure, and only the components related to the present invention are shown in the drawings, not according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be changed arbitrarily, and the layout of the components may be more complex.
In the following description, numerous details are set forth in order to provide a more thorough explanation of embodiments of the present invention, it will be apparent, however, to one skilled in the art that embodiments of the present invention may be practiced without these specific details, in other embodiments, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a schematic view of an apparatus for a drying oven area according to an exemplary embodiment of the present application. As shown in fig. 1, a drying furnace 1 is connected with a blast furnace gas pipeline and a coking coal gas pipeline, wherein the blast furnace gas pipeline is sequentially connected with a blast furnace gas flow cut-off valve 2 and a blast furnace gas flow regulating valve 3, and the coking coal gas pipeline is sequentially connected with a coke oven gas flow cut-off valve 4 and a coke oven gas flow regulating valve 5. The drying furnace 1 is also connected with a combustion-supporting fan 6, a drying furnace relief valve 7 and an exhaust gas induced draft fan air door actuator 8. Wherein, a combustion-supporting air flow regulating valve 9 is connected between the combustion-supporting fan 6 and the drying furnace 1. One end of the exhaust gas induced draft fan air door actuator 8 is connected with a hot blast stove exhaust gas pipeline, the other end is connected with an exhaust gas induced draft fan 10, and the exhaust gas induced draft fan 10 is positioned between the hot blast stove and the drying furnace 1.
When the drying oven 1 is in the ignition stage, the drying oven blow-off valve 7 is opened, and an ignition program is determined by detecting the presence or absence of a coking coal gas line to ignite the drying oven 1. When the drying furnace 1 is in the heat preservation stage, the opening degree of the blast furnace gas flow regulating valve 3 is regulated so that the first temperature is within the temperature threshold range. When the drying furnace 1 is in the warm grinding stage, the drying furnace bleeding valve 7 is closed, and the opening of the blast furnace gas flow rate regulating valve 3 is regulated so that the first temperature is within the temperature threshold range. When the drying furnace 1 is in the coal drying stage, the exhaust gas induced draft fan air door actuator 8 is opened, the exhaust gas induced draft fan 10 is started, and the opening degree of the exhaust gas induced draft fan air door actuator 8 is adjusted so that the first pressure is within the range of the hearth pressure threshold of the drying furnace.
Referring to fig. 2, fig. 2 is a flowchart illustrating an automatic control method of a blast furnace coal injection system drying furnace according to an exemplary embodiment of the present application. As shown in fig. 1, in an exemplary embodiment, the automatic control method of the blast furnace coal injection system drying furnace at least includes steps S210 to S270, which are described in detail as follows:
step S210, detecting a coke oven gas pipeline.
In one embodiment of the application, the coke oven gas pipeline can be confirmed through manual inspection, can be detected through a sensor, and can also be detected through an image recognition mode.
Step S220, determining an ignition program according to the detection result of the coke oven gas pipeline.
The ignition program includes a first ignition program and a second ignition program.
In one embodiment of the application, when no coke oven gas pipe is detected, a first ignition program is selected, and blast furnace gas is input to complete ignition.
Specifically, the first ignition program is to control the drying furnace system to be automatically started and then control the drying furnace relief valve 7 to be opened in place; after acquiring a signal that the drying furnace diffusion valve 7 is opened in place, the blast furnace gas flow regulating valve 3 is automatically opened to a set initial opening V 2Init The combustion air flow rate regulating valve 9 is automatically opened to a set initial opening V 1Init And starting the combustion fan 6; after the normal operation of the combustion-supporting fan 6 is delayed for 30 seconds, the blast furnace gas flow cut-off valve 2 is opened, and the gas and the combustion-supporting air enter the combustion chamber of the drying furnace 1 to be mixed at the moment; after the gas and the combustion air are mixed for 30 seconds, the ignition gun automatically advances and ignites. Wherein, combustion-supporting airThe normal running time of the machine 6 and the mixing time of the gas and the combustion air can be adjusted according to specific working conditions.
After the ignition is completed, the flow rate of the combustion air to the combustion fan 6 may be measured by a flow meter (F 2Act * Alpha) real-time feedback and PID tracking. Wherein F is 2Act The actual blast furnace gas flow rate is represented, and alpha represents the combustion-supporting ratio.
In one embodiment of the invention, when a coke oven gas pipe is detected, a second ignition program is selected, and coke oven gas is input to complete ignition.
Specifically, the second ignition program is to control the drying furnace 1 to be automatically started and then control the drying furnace relief valve 7 to be opened in place; after acquiring the opening signal of the drying furnace diffusion valve 7, the combustion air flow rate regulating valve 9 is automatically opened to the set initial opening V 1Init The coke oven gas flow regulating valve 5 is opened to a set initial opening degree V 5Init And starting the combustion fan 6; after the normal operation of the combustion fan 6 is delayed for 30 seconds, the coke oven gas flow cut-off valve 4 is opened, and at the moment, the coke oven gas and the combustion air enter the combustion chamber of the drying furnace 1 to be mixed; the ignition gun automatically advances and ignites.
In one embodiment of the present invention, step S220 may include steps S221 to S223 after determining the ignition process according to the detection result of the coke oven gas pipe.
Step S221, detecting a display lamp of the flame detector.
In one embodiment of the invention, the display lamp of the flame detector can be confirmed by human checking, can be detected by a sensor, and can also be detected by an image recognition mode.
In step S222, if the display lamp of the flame detector is detected to be on, the ignition is successful, and the combustion process is performed.
In one embodiment of the invention, when the display light of the flame detector is detected to be on, which indicates that the ignition of the ignition gun is successful, the combustion process may be performed to enter the soak phase.
If the second ignition program is executed, the flow rate of blast furnace gas is adjusted after the ignition is successfulThe throttle valve 3 is automatically opened to a set initial opening V 2Init And opens the blast furnace gas flow shut-off valve 2, and then closes the coke oven gas flow regulating valve 5 and the coke oven gas flow shut-off valve 4. The flow rate of the combustion air to the combustion fan 6 (F 2Act * Alpha) real-time feedback and PID tracking.
In step S223, if the display lamp of the flame detector is not detected to be on, the ignition fails, and the ignition process is repeated until the display lamp of the flame detector is detected to be on.
In one embodiment of the invention, when the display light of the flame detector is not detected to be on, the ignition failure of the ignition gun is indicated, and the ignition process is required to be repeated until the ignition gun is successfully ignited, and the display light of the flame detector is on.
In another embodiment of the present invention, when the lighting of the display lamp of the flame detector is not detected, whether the ignition of the flame gun is successful or not can be judged by detecting the hearth temperature of the drying furnace 1. When the hearth temperature of the drying furnace 1 is detected to be higher than 400 ℃, the ignition gun is successfully ignited; when the hearth temperature of the drying furnace 1 is detected to be lower than 400 ℃, the failure of ignition of the ignition gun is indicated.
In step S230, a first flow, a first opening, a first temperature, a second temperature, a third temperature, and a first pressure are obtained.
The first flow is the real-time flow of the blast furnace gas, the first opening is the real-time opening of the blast furnace gas flow regulating valve, the first temperature is the real-time temperature of the drying furnace hearth, the second temperature is the real-time temperature of the coal mill inlet, the third temperature is the real-time temperature of the coal mill outlet, and the first pressure is the real-time pressure of the drying furnace hearth.
In one embodiment of the application, the first flow rate may be fed back through the flow meter, the first opening degree may be fed back through the displacement sensor, the first temperature, the second temperature and the third temperature may be obtained by using the temperature sensor, and the first pressure may be obtained by using the micro differential pressure transmitter.
For example, the first flow, the first opening, the first temperature, the second temperature, the third temperature, and the first pressure may be obtained once every 1 second, or may be adjusted according to an actual working condition.
Step S240, determining a combustion program according to the correspondence between the first opening and the first flow rate, so as to make the first temperature within the temperature threshold range.
Referring to fig. 3, fig. 3 is a graph illustrating a valve flow characteristic according to an exemplary embodiment of the present application. As shown in fig. 3, in one embodiment of the present application, during the debugging process, the opening of the blast furnace gas flow rate regulating valve 3 and the blast furnace gas flow rate through which the opening passes are obtained, and it is determined whether the correspondence between the opening and the blast furnace gas flow rate accords with the valve flow rate characteristic curve, and then the combustion program is selected and used as the recommended combustion program for the combustion control of the subsequent drying furnace 1.
In another embodiment of the present application, in the operation process, under the condition that the blast furnace gas flow rate regulating valve 3 is at the same opening, when the blast furnace gas flows passing through the opening in different periods are consistent, the corresponding relation between the first opening and the first flow rate is indicated to be in accordance with the valve flow rate characteristic curve; when the blast furnace gas flow rates passing through the different opening periods are inconsistent, if the deviation of the blast furnace gas flow rates passing through the different opening periods reaches or exceeds 10%, the corresponding relation between the first opening and the first flow rate is not consistent with the valve flow rate characteristic curve.
In another embodiment of the present invention, in the operation process, when the valve opening of the blast furnace gas flow rate regulating valve 3 cannot cover the corresponding target measuring range in the valve flow rate characteristic curve within the range of 0-100%, it indicates that the corresponding relationship between the first opening and the first flow rate does not conform to the valve flow rate characteristic curve.
In the operation process, when the blast furnace gas flow rate adjustment valve 3 is at the same opening degree, and the blast furnace gas flows passing through the different opening degrees are inconsistent, but the deviation amount of the blast furnace gas flows passing through the different opening degrees is between 0% and 10%, the corresponding relation between the first opening degree and the first flow rate is determined to be in accordance with the valve flow rate characteristic curve.
Specifically, the combustion process includes a first combustion process and a second combustion process.
After the drying furnace 1 is successfully ignited, the heating stage, the warm grinding stage and the coal drying stage are sequentially carried out. Wherein, the heat preservation stage, the warm grinding stage and the coal drying stage all involve gas combustion, so that the stages involve the selection of a combustion program.
After the combustion process is determined in the heat preservation stage, the combustion process in the heat preservation stage can be continued in the warm grinding stage, the combustion process can be selected again, and the subsequent coal drying stage refers to the scheme. The combustion program can be switched in the middle of each stage, and the combustion program can be manually switched or automatically switched by the system.
In one embodiment of the present invention, the first combustion process is selected when the correspondence between the first opening and the first flow rate corresponds to a valve flow rate characteristic curve.
Specifically, after determining that the combustion process is the first combustion process, the initial blast furnace gas flow rate F of the blast furnace gas may be tracked by the flow meter 2Init And the opening of the blast furnace gas flow regulating valve 3 is regulated by the first controller to control the blast furnace gas flow entering the drying furnace 1 so that the first temperature is within the temperature threshold range. Wherein the first controller is a PID regulator controller.
In one embodiment of the invention, when the drying furnace 1 is successfully ignited and the heat preservation stage is just entered, the blast furnace gas flow rate entering the drying furnace 1 is the initial blast furnace gas flow rate F 2Init And monitoring the hearth temperature of the drying furnace and the diffusion temperature of the drying furnace. After 30 seconds, the opening of the blast furnace gas flow regulating valve 3 is regulated according to the comparison result by comparing the first temperature with a temperature threshold.
Wherein, when in the heat preservation stage, the temperature threshold value comprises the heat preservation temperature T of the drying furnace Hold And the upper limit T of the discharge temperature of the drying furnace 4H 。
When T is Act ＜T Hold When the first controller controls the opening of the blast furnace gas flow regulating valve 3 to increase the corresponding valve opening of the blast furnace gas flow regulating gradient in the valve flow characteristic curve so as to increase the hearth temperature of the drying furnace, the opening can be expressed by the following formula:
F 2Set ＝F 2Init +F 2△ ；
When T is Act ≥T Hold But T is 4Act ≤T 4H When the blast furnace gas flow regulating valve 3 is not regulated by the first controller;
when T is Act ≥T Hold And T is 4Act ＞T 4H When the first controller controls the opening of the blast furnace gas flow regulating valve 3 to reduce the valve opening corresponding to the blast furnace gas flow regulating gradient in the valve flow characteristic curve so as to reduce the hearth temperature of the drying furnace, the opening can be expressed by the following formula:
F 2Set ＝F 2Init -F 2△ ；
wherein T is Act Representing a first temperature; t (T) Hold The temperature of the drying furnace is represented; t (T) 4Act Indicating the actual bleeding temperature of the drying furnace; t (T) 4H Indicating the upper limit of the bleeding temperature of the drying furnace; f (F) 2Iint Representing an initial blast furnace gas flow; f (F) 2△ Represents the blast furnace gas flow regulation gradient; f (F) 2Set The flow rate of the blast furnace gas after 30 seconds from the entry of the holding stage is shown.
In one embodiment of the invention, after entering the warm grinding stage, the opening of the blast furnace gas flow regulating valve 3 is regulated according to the comparison result by comparing the first temperature with a temperature threshold value.
After entering the warm grinding stage, the main exhaust fan is controlled to be turned on to form negative pressure, hot air starts to enter the coal mill to warm grind the coal mill, and at the moment, the drying furnace diffusion valve 7 is closed. When in the warm mill phase, the temperature threshold includes an upper kiln warm mill temperature limit and a lower kiln warm mill temperature limit.
When T is Act ＜(T Hold -T △ ) When the first controller controls the opening of the blast furnace gas flow regulating valve 3 to increase the corresponding valve opening of the blast furnace gas flow regulating gradient in the valve flow characteristic curve so as to increase the hearth temperature of the drying furnace, the opening can be expressed by the following formula:
F 2Set ”＝F 2Set '+F 2△ ；
when T is Act ＞(T Hold +T △ ) When the first controller controls the opening of the blast furnace gas flow regulating valve 3 to reduce the valve opening corresponding to the blast furnace gas flow regulating gradient in the valve flow characteristic curve so as to reduce the hearth temperature of the drying furnace, the opening can be expressed by the following formula:
F 2Set ”＝F 2Set '－F 2△ ；
when (T) Hold -T △ )≤T Act ≤(T Hold +T △ ) When the first controller does not regulate the blast furnace gas flow regulating valve 3.
Wherein, (T) Hold -T △ ) Indicating the lower limit of the warm grinding temperature of the drying furnace; (T) Hold +T △ ) Indicating the upper limit of the warm grinding temperature of the drying furnace; t (T) △ Indicating the temperature difference of the warm mill of the drying furnace; f (F) 2Set "means the current blast furnace gas flow rate; f (F) 2Set ' represents F 2Set "blast furnace gas flow for the first 30 seconds".
In one embodiment of the present invention, the second combustion process is selected when the correspondence between the first opening and the first flow rate does not correspond to the valve flow rate characteristic curve.
Specifically, when the combustion process is determined to be the second combustion process, the opening of the blast furnace gas flow regulating valve 3 is regulated by the second controller to control the blast furnace gas flow entering the drying furnace 1 so that the first temperature is within the temperature threshold range. Wherein the second controller is a blast furnace gas flow regulating valve opening controller.
The second combustion process was performed to cancel tracking of the blast furnace gas flow rate by PID, and the valve position of the blast furnace gas flow rate regulating valve 3 was controlled in a periodically quantitative manner.
In one embodiment of the invention, when the ignition of the drying furnace 1 successfully enters the heat preservation stage, the valve position of the blast furnace gas flow regulating valve 3 of the drying furnace 1 is the initial valve position V 2Iint And monitoring the hearth temperature of the drying furnace and the diffusion temperature of the drying furnace. After 30 seconds, the opening degree of the blast furnace gas flow rate regulating valve 3 is adjusted according to the comparison result by comparing the first temperature with the temperature threshold value.
Wherein the method comprises the steps ofWhen in the heat preservation stage, the temperature threshold value comprises the heat preservation temperature T of the drying furnace Hold And the upper limit T of the discharge temperature of the drying furnace 4H 。
When T is Act ＜T Hold When the second controller controls the opening of the blast furnace gas flow regulating valve 3 to increase the valve position regulating gradient of the blast furnace gas flow regulating valve 3 so as to raise the hearth temperature of the drying furnace, the valve position regulating gradient can be expressed by the following formula:
V 2Set ＝V 2Init +V 2△ ；
when T is Act ≥T Hold But T is 4Act ≤T 4H When the blast furnace gas flow regulating valve 3 is not regulated by the second controller;
when T is Act ≥T Hold And T is 4Act ＞T 4H When the opening of the blast furnace gas flow regulating valve 3 is controlled by the second controller to reduce the valve position regulating gradient of the blast furnace gas flow regulating valve 3 so as to reduce the hearth temperature of the drying furnace, the valve position regulating gradient can be expressed by the following formula:
V 2Set ＝V 2Init -V 2△ ；
Wherein T is Act Representing a first temperature; t (T) Hold The temperature of the drying furnace is represented; t (T) 4Act Indicating the actual bleeding temperature of the drying furnace; t (T) 4H Indicating the upper limit of the bleeding temperature of the drying furnace; v (V) 2Iint The initial valve position of the blast furnace gas flow regulating valve 3 is shown; v (V) 2△ A valve position adjustment gradient of the blast furnace gas flow rate adjustment valve 3; v (V) 2Set The valve position of the blast furnace gas flow regulating valve 3 after 30 seconds of entering the heat preservation stage is shown.
In one embodiment of the invention, after entering the warm grinding stage, the opening degree of the blast furnace gas flow regulating valve 3 is regulated according to the comparison result by comparing the first temperature with a temperature threshold value.
After entering the warm grinding stage, the main exhaust fan is controlled to be turned on to form negative pressure, and hot air starts to enter the coal mill area to warm grind the coal mill, and at the moment, the drying furnace bleeding valve 7 is closed. When in the warm mill phase, the temperature threshold includes an upper kiln warm mill temperature limit and a lower kiln warm mill temperature limit.
When T is Act ＜(T Hold -T △ ) When the second controller controls the opening of the blast furnace gas flow regulating valve 3 to increase the valve position regulating gradient of the blast furnace gas flow regulating valve 3 so as to raise the hearth temperature of the drying furnace, the valve position regulating gradient can be expressed by the following formula:
V 2Set ”＝V 2Set '+V 2△ ；
when T is Act ＞(T Hold +T △ ) When the second controller controls the opening degree of the blast furnace gas flow regulating valve 3 to reduce the valve position regulating gradient of the blast furnace gas flow regulating valve 3 so as to reduce the hearth temperature of the drying furnace, the second controller can be expressed by the following formula:
V 2Set ”＝V 2Set '-V 2△ ；
When (T) Hold -T △ )≤T Act ≤(T Hold +T △ ) The second controller does not adjust the blast furnace gas flow regulating valve 3 at this time.
Wherein, (T) Hold -T △ ) Indicating the lower limit of the warm grinding temperature of the drying furnace; (T) Hold +T △ ) Indicating the upper limit of the warm grinding temperature of the drying furnace; t (T) △ Indicating the temperature difference of the warm mill of the drying furnace; v (V) 2Set "represents the current valve position of the blast furnace gas flow regulating valve 3; v (V) 2Set ' represents V 2Set "the valve position of the blast furnace gas flow regulating valve 3 for the first 30 seconds".
Step S250, determining the opening degree of the exhaust gas induced draft fan air door actuator 8 according to the first pressure so that the first pressure is within the range of the hearth pressure threshold of the drying furnace.
When the time of entering the hot air into the coal mill exceeds the preset warm grinding time, the warm grinding stage is ended. At this time, the opening of the air door actuator 8 of the exhaust air draught fan is controlled to be adjusted to an initial opening (usually not more than 5%), the exhaust air draught fan 10 is automatically started, and the exhaust air of the hot blast stove is introduced into the drying furnace 1 to be mixed with the burnt high-temperature gas to form high-temperature inert gas, so that the oxygen content in the high-temperature flue gas output by the drying furnace 1 is rapidly reduced. When the oxygen content in the high-temperature flue gas output by the drying furnace 1 is reduced to the production range, the coal drying stage is started.
In one embodiment of the invention, the acquired first pressure is compared with a furnace pressure threshold of the drying furnace, and the opening degree of the air door actuator 8 of the exhaust gas induced draft fan is adjusted according to the comparison result.
The furnace pressure threshold of the drying furnace includes an upper furnace pressure limit P H And a lower limit P of the furnace pressure of the drying furnace L 。
When P Act ＞P H When the opening degree of the exhaust gas induced draft fan air door actuator 8 is reduced, the opening degree adjusting gradient of the exhaust gas induced draft fan air door actuator 8 is reduced, so that the furnace pressure of the drying furnace is reduced, and the method can be expressed by the following formula:
V 3Set ＝V 3Init -V 3△ ；
when P Act ＜P L When the opening degree of the exhaust gas induced draft fan air door actuator 8 is increased, the opening degree adjusting gradient of the exhaust gas induced draft fan air door actuator 8 is increased so as to increase the furnace pressure of the drying furnace, and the method can be expressed by the following formula:
V 3Set ＝V 3Init +V 3△ ；
when P L ≤P Act ≤P H And when the exhaust gas induced draft fan damper actuator 8 is opened, the opening degree is not adjusted.
Wherein P is Act Representing a first pressure; v (V) 3Set Indicating the opening degree of the air door actuator 8 of the waste gas induced draft fan after entering the coal drying stage for 30 seconds; v (V) 3Init Indicating the initial opening of the exhaust draught fan air door actuator 8; v (V) 3△ The gradient of the opening degree adjustment of the exhaust gas induced draft fan damper actuator 8 is shown.
In one embodiment of the present invention, step S260 of controlling the second temperature within the preset range of the coal mill inlet temperature and controlling the third temperature within the preset range of the coal mill outlet temperature according to the current combustion process may include steps S261 to S262.
The time for obtaining the second temperature and the third temperature by using the temperature sensor is after the warm grinding stage, that is, when the high-temperature flue gas output by the drying furnace 1 enters the coal mill.
Exemplary, the coal mill inlet temperature preset ranges from 270 ℃ to 285 ℃ and the coal mill outlet temperature preset ranges from 80 ℃ to 90 ℃.
In step S261, when the current combustion model is the first combustion program, the flow rate of the blast furnace gas entering the drying furnace 1 is controlled by the first controller to control the second temperature within the preset range of the inlet temperature of the coal mill and the third temperature within the preset range of the outlet temperature of the coal mill.
Specifically, when the preset range of the inlet temperature of the coal mill is smaller than 270 ℃, the first controller controls the opening of the blast furnace gas flow regulating valve 3 to increase two blast furnace gas flow regulating gradients F 2△ The corresponding valve opening in the valve flow characteristic curve is used for increasing the flow of blast furnace gas entering the drying furnace 1 so as to increase the inlet temperature of the coal mill; when the preset range of the inlet temperature of the coal mill is larger than 285 ℃, the first controller controls the opening of the blast furnace gas flow regulating valve 3 to reduce two blast furnace gas flow regulating gradients F 2△ The corresponding valve opening in the valve flow characteristic curve is used for reducing the flow of blast furnace gas entering the drying furnace 1 so as to reduce the inlet temperature of the coal mill; when the preset range of the inlet temperature of the coal mill is larger than 290 ℃, the first controller controls the opening of the blast furnace gas flow regulating valve 3 to reduce five blast furnace gas flow regulating gradients F 2△ The corresponding valve opening in the valve flow characteristic curve reduces the blast furnace gas flow into the drying furnace 1, so that the inlet temperature of the coal mill is reduced.
When the preset value range of the outlet temperature of the coal mill is smaller than 80 ℃ and the inlet temperature of the coal mill is 270-285 ℃, the first controller controls the opening of the blast furnace gas flow regulating valve 3 to increase a blast furnace gas flow regulating gradient F 2△ The corresponding valve opening in the valve flow characteristic curve is used for increasing the flow of blast furnace gas entering the drying furnace 1 so as to increase the outlet temperature of the coal mill; when the preset value range of the inlet temperature of the coal mill is larger than 90 ℃ and the inlet temperature of the coal mill is 270-285 ℃, the first controller controls the opening of the blast furnace gas flow regulating valve 3 to be reduced by one blast furnace gas flow regulating gradient F 2△ Valve corresponding to valve flow characteristic curveThe door opening is used for reducing the flow rate of the blast furnace gas entering the drying furnace 1, so that the inlet temperature of the coal mill is reduced.
In step S262, when the current combustion model is the second combustion program, the flow rate of the blast furnace gas entering the drying furnace 1 is controlled by the second controller to control the second temperature within the preset range of the inlet temperature of the coal mill and the third temperature within the preset range of the outlet temperature of the coal mill.
Specifically, when the preset range of the inlet temperature of the coal mill is smaller than 270 ℃, the second controller controls the opening of the blast furnace gas flow regulating valve 3 to increase the valve position regulating gradient V of the two blast furnace gas flow regulating valves 3 2△ To increase the flow of blast furnace gas into the drying furnace 1 so that the inlet temperature of the coal mill rises; when the preset range of the inlet temperature of the coal mill is larger than 285 ℃, the second controller controls the opening of the blast furnace gas flow regulating valve 3 to reduce the valve position regulating gradient V of the two blast furnace gas flow regulating valves 3 2△ To reduce the flow of blast furnace gas into the drying furnace 1 so that the inlet temperature of the coal mill is reduced; when the preset range of the inlet temperature of the coal mill is larger than 290 ℃, the second controller controls the opening of the blast furnace gas flow regulating valve 3 to reduce the valve position regulating gradient V of the five blast furnace gas flow regulating valves 3 2△ To reduce the flow of blast furnace gas into the kiln 1 so that the coal mill inlet temperature is reduced.
When the preset value range of the outlet temperature of the coal mill is smaller than 80 ℃ and the inlet temperature of the coal mill is 270-285 ℃, the second controller controls the opening of the blast furnace gas flow regulating valve 3 to increase the valve position regulating gradient V of the blast furnace gas flow regulating valve 3 2△ To increase the flow of blast furnace gas into the drying furnace 1 so that the outlet temperature of the coal mill rises; when the preset value range of the inlet temperature of the coal mill is larger than 90 ℃ and the inlet temperature of the coal mill is 270-285 ℃, the second controller controls the opening of the blast furnace gas flow regulating valve 3 to be reduced by one valve position regulating gradient V of the blast furnace gas flow regulating valve 3 2△ To reduce the flow of blast furnace gas into the kiln 1 so that the coal mill inlet temperature is reduced.
For example, the coal mill inlet temperature may be adjusted every 30 seconds, the coal mill outlet temperature may be adjusted every 60 seconds, or the time interval may be selected for adjustment according to actual demand.
In an exemplary embodiment, the automatic control method of the blast furnace coal injection system drying furnace may further include steps S310 to S340.
Step S310, the pulverizing quantity is divided into N pulverizing grades according to the pulverizing capacity of the equipment, and each pulverizing grade is provided with a corresponding blast furnace gas set flow.
Illustratively, the milling amount was divided into 10 milling grades according to the milling capacity of the apparatus, as shown in table 1.
TABLE 1
Step S320, obtaining a first powder amount.
Specifically, the first powder preparation amount is the real-time powder preparation amount of the blast furnace powder preparation system.
After entering the coal drying stage, the coal injection system starts to discharge coal, and at this time, the first powder preparation amount can be obtained by the weighing equipment.
Step S330, determining the powder production grade according to the first powder production amount.
The first powder amount is the real-time powder amount of the blast furnace powder system, and the real-time powder amount of the blast furnace powder system is compared with the powder amount corresponding to each powder level to determine the powder level of the first powder amount.
Exemplary, if the first powder is 28t/h, the first flow is 2200m 3 And/h. Determining the powder making grade as W according to the first powder making amount 3 Powder grade W 3 The corresponding blast furnace gas set flow is 2200m 3 /h。
Step S340, setting the blast furnace gas flow adjusted by the first controller as the blast furnace gas flow set flow of the powder making grade, and taking the blast furnace gas flow set flow as the initial blast furnace gas target flow of the next powder making.
Specifically, in order to make the second temperature and the third temperature respectively within the preset value range of the inlet temperature of the coal mill and the preset value range of the outlet temperature of the coal mill, the flow rate of the blast furnace gas entering the drying furnace 1 is controlled by the first controller, and the adjusted flow rate of the blast furnace gas is set as the set flow rate of the blast furnace gas of the pulverizing grade. When the next time the blast furnace coal injection system enters the coal drying stage, the adjusted blast furnace gas set flow is tracked as the blast furnace gas target flow so as to adjust the first flow.
In summary, the scheme of the embodiment completes ignition and combustion of the drying furnace through the ignition program and the combustion program, and controls the hearth pressure of the drying furnace by controlling the opening of the air door regulating valve of the exhaust air induced draft fan, so that the hearth temperature and the hearth pressure of the drying furnace can be quickly and accurately regulated, system fluctuation caused by manual operation is avoided, and automation of blast furnace gas combustion is realized; and the data is provided for the subsequent powder preparation by acquiring the first powder preparation amount and determining the blast furnace gas set flow, so that the reliability of coal injection is improved, and the quality of the coal powder prepared by the powder preparation system is further improved.
Referring to fig. 4, fig. 4 is a block diagram illustrating an automatic control apparatus for a drying furnace of a blast furnace coal injection system according to an exemplary embodiment of the present application. The exemplary blast furnace gas combustion control apparatus includes: the system comprises a detection module 410, an acquisition module 420, an adjustment module 430 and a recording module 440.
A detection module 410 for detecting the presence or absence of a coke oven gas pipe;
the ignition module 420 determines an ignition program according to the detection result of the coke oven gas pipeline;
an obtaining module 430, configured to obtain a first flow rate, a first opening, a first temperature, a first pressure, and a first powder amount;
the combustion module 440 determines a combustion program according to the correspondence between the first flow rate and the first opening degree;
The control module 450 is configured to control the first temperature within a temperature threshold range, control the opening of the exhaust gas induced draft fan damper actuator 8 so that the first pressure is within a furnace pressure threshold range of the drying furnace, control the second temperature within a preset coal mill inlet temperature range, and control the third temperature within a preset coal mill outlet temperature range.
It should be noted that, the blast furnace gas combustion control device provided in the above embodiment and the automatic control method of the blast furnace coal injection system drying furnace provided in the above embodiment belong to the same concept, and specific procedures for executing operations by each module and unit have been described in detail in the method embodiment, which is not repeated here. In practical application, the blast furnace gas combustion control device provided in the above embodiment may distribute the functions to be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above, which is not limited herein.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. Where each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. It is therefore intended that all equivalent modifications and changes made by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the appended claims.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (9)
1. An automatic control method for a drying furnace of a blast furnace coal injection system is characterized by comprising the following steps:
detecting a coke oven gas pipeline;
determining an ignition program according to the detection result of the coke oven gas pipeline;
Acquiring a first flow, a first opening, a first temperature, a second temperature, a third temperature and a first pressure, wherein the first flow is real-time flow of blast furnace gas, the first opening is real-time opening of a blast furnace gas flow regulating valve, the first temperature is real-time temperature of a drying furnace hearth, the second temperature is real-time temperature of a coal mill inlet, the third temperature is real-time temperature of a coal mill outlet, and the first pressure is real-time pressure of the drying furnace hearth;
determining a combustion program according to the corresponding relation between the first opening and the first flow so as to enable the first temperature to be in a temperature threshold range;
determining the opening degree of an air door actuator of the waste gas induced draft fan according to the first pressure so that the first pressure is within a furnace chamber pressure threshold range of the drying furnace;
and controlling the second temperature within a preset range of the inlet temperature of the coal mill and controlling the third temperature within a preset range of the outlet temperature of the coal mill according to the current combustion program.
2. The automatic control method for a blast furnace coal injection system drying furnace according to claim 1, wherein the determining an ignition program according to the detection result of the coke oven gas pipe comprises:
The ignition program comprises a first ignition program and a second ignition program;
when no coke oven gas pipeline is detected, selecting the first ignition program, and inputting blast furnace gas to finish ignition;
and when the coke oven gas pipeline is detected, selecting the second ignition program, and inputting coke oven gas to finish ignition.
3. The method according to claim 1, wherein determining a combustion program according to the correspondence between the first opening and the first flow rate so that the first temperature is within a temperature threshold range comprises:
the combustion process includes a first combustion process;
when the corresponding relation accords with a valve flow characteristic curve, selecting the first combustion program;
and adjusting the opening of a blast furnace gas flow regulating valve through a first controller to control the blast furnace gas flow entering the drying furnace so that the first temperature is within the temperature threshold range.
4. The method for automatically controlling a drying furnace of a blast furnace coal injection system according to claim 3, wherein determining a combustion program according to the correspondence between the first opening and the first flow rate so that the first temperature is within a temperature threshold range comprises:
The combustion process includes a second combustion process;
when the corresponding relation does not accord with the valve flow characteristic curve, selecting the second combustion program;
and adjusting the opening of the blast furnace gas flow regulating valve through a second controller so as to control the flow of the blast furnace gas entering the drying furnace, so that the first temperature is within the temperature threshold range.
5. The automatic control method for a blast furnace coal injection system drying furnace according to claim 1, 3 or 4, wherein determining a combustion program according to the correspondence between the first opening and the first flow rate so that the first temperature is within a temperature threshold range includes:
when the temperature is in the heat preservation stage, the temperature threshold value comprises the heat preservation temperature of the drying furnace and the upper limit of the diffusion temperature of the drying furnace;
when in the warm mill phase, the temperature threshold includes an upper dryer warm mill temperature limit and a lower dryer warm mill temperature limit.
6. The automatic control method for a blast furnace coal injection system drying furnace according to claim 4, wherein said controlling the second temperature within a preset range of coal mill inlet temperatures and the third temperature within a preset range of coal mill outlet temperatures according to the current combustion program comprises:
When the current combustion model is the first combustion program, controlling the blast furnace gas flow entering the drying furnace through the first controller so as to control the second temperature within a preset range of the inlet temperature of the coal mill and control the third temperature within a preset range of the outlet temperature of the coal mill;
and when the current combustion model is the second combustion program, controlling the blast furnace gas flow entering the drying furnace through the second controller so as to control the second temperature within a preset range of the inlet temperature of the coal mill and control the third temperature within a preset range of the outlet temperature of the coal mill.
7. The automatic control method for a blast furnace coal injection system drying furnace according to claim 6, wherein when the current combustion model is the first combustion program, the blast furnace gas flow rate into the drying furnace is controlled by the first controller to control the second temperature within a coal mill inlet temperature preset value range, and the third temperature is controlled within a coal mill outlet temperature preset value range, the method further comprising:
Dividing the pulverizing quantity into N pulverizing grades according to the pulverizing capacity of equipment, wherein each pulverizing grade is provided with a corresponding blast furnace gas set flow;
acquiring a first powder preparation amount, wherein the first powder preparation amount is real-time powder preparation amount of a blast furnace powder preparation system;
determining the pulverizing grade according to the first pulverizing quantity;
setting the blast furnace gas flow rate regulated by the first controller as the blast furnace gas flow rate set flow rate of the pulverizing grade, and taking the blast furnace gas flow rate as the initial blast furnace gas target flow rate of the next pulverizing.
8. The automatic control method for a blast furnace coal injection system drying furnace according to claim 1, wherein after determining the ignition program according to the detection result of the coke oven gas pipe, further comprising:
detecting a display lamp of the flame detector;
if the display lamp is detected to be on, the ignition is successful, and the combustion program is implemented;
if the display lamp is not detected to be on, the ignition fails, and the ignition procedure is repeated until the display lamp is detected to be on.
9. An automatic control device for a drying furnace of a blast furnace coal injection system, which is characterized by comprising:
the detection module is used for detecting whether a coke oven gas pipeline exists or not;
The ignition module is used for determining an ignition program according to the detection result of the coke oven gas pipeline;
the acquisition module is used for acquiring the first flow, the first opening, the first temperature, the second temperature, the third temperature and the first pressure;
the combustion module is used for determining a combustion program according to the corresponding relation between the first flow and the first opening;
the control module is used for controlling the first temperature to be in a temperature threshold range, controlling the opening of an exhaust gas induced draft fan air door actuator to enable the first pressure to be in a drying furnace hearth pressure threshold range, controlling the second temperature to be in a coal mill inlet temperature preset value range and controlling the third temperature to be in a coal mill outlet temperature preset value range.
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| CN202310681272.1A CN116697730A (en) | 2023-06-09 | 2023-06-09 | Automatic control method and device for drying furnace of blast furnace coal injection system |
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| CN202310681272.1A CN116697730A (en) | 2023-06-09 | 2023-06-09 | Automatic control method and device for drying furnace of blast furnace coal injection system |
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| CN202310681272.1A Pending CN116697730A (en) | 2023-06-09 | 2023-06-09 | Automatic control method and device for drying furnace of blast furnace coal injection system |
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