CN114688868A - Total oxygen combustion system for steel rolling heating furnace - Google Patents
Total oxygen combustion system for steel rolling heating furnace Download PDFInfo
- Publication number
- CN114688868A CN114688868A CN202210358884.2A CN202210358884A CN114688868A CN 114688868 A CN114688868 A CN 114688868A CN 202210358884 A CN202210358884 A CN 202210358884A CN 114688868 A CN114688868 A CN 114688868A
- Authority
- CN
- China
- Prior art keywords
- oxygen
- value
- fuel
- billet
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000001301 oxygen Substances 0.000 title claims abstract description 186
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 186
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 162
- 238000010438 heat treatment Methods 0.000 title claims abstract description 129
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 74
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000005096 rolling process Methods 0.000 title claims abstract description 40
- 239000000446 fuel Substances 0.000 claims abstract description 175
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000002791 soaking Methods 0.000 claims abstract description 33
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 25
- 239000000779 smoke Substances 0.000 claims abstract description 21
- 238000004321 preservation Methods 0.000 claims abstract description 17
- 238000010926 purge Methods 0.000 claims abstract description 10
- 238000012546 transfer Methods 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 239000002356 single layer Substances 0.000 claims abstract description 3
- 230000001105 regulatory effect Effects 0.000 claims description 31
- 239000007789 gas Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- 238000013178 mathematical model Methods 0.000 claims description 6
- 230000006870 function Effects 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 3
- 239000011449 brick Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000011217 control strategy Methods 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 claims description 3
- 101710179738 6,7-dimethyl-8-ribityllumazine synthase 1 Proteins 0.000 claims description 2
- 101710186608 Lipoyl synthase 1 Proteins 0.000 claims description 2
- 101710137584 Lipoyl synthase 1, chloroplastic Proteins 0.000 claims description 2
- 101710090391 Lipoyl synthase 1, mitochondrial Proteins 0.000 claims description 2
- 238000012937 correction Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 239000010410 layer Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000010763 heavy fuel oil Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
- F27B9/028—Multi-chamber type furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/36—Arrangements of heating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Control Of Heat Treatment Processes (AREA)
Abstract
The invention provides a total oxygen combustion system for a steel rolling heating furnace, which comprises a heating furnace, a fuel system, a combustion-supporting system, a nitrogen purging system, a smoke discharging system and a control system, wherein the heating furnace is connected with the fuel system through a pipeline; the heating furnace comprises a preheating section, a heating section and a soaking section. And the side walls of the upper heating zone and the lower heating zone of the heating section are provided with full-oxygen flameless combustors, and the full-oxygen flameless combustors are layered from top to bottom and arranged in a left-right staggered manner. The side walls of the upper heating zone and the lower heating zone of the soaking section are provided with full-oxygen flameless combustors, and the full-oxygen flameless combustors are arranged in a vertically layered and horizontally staggered manner; and the end wall of the heating zone at the upper part of the soaking section is provided with a total oxygen flameless burner which is horizontally arranged in a single layer. The control system comprises a blank tracking system, an intelligent temperature control system, a hearth pressure control system, a linkage alarm protection system and a blank heat-preservation system to be rolled. Aims to improve the combustion efficiency and the heat transfer efficiency of the steel rolling heating furnace and achieve the aims of improving the productivity, saving the fuel, reducing the emission and improving the product quality.
Description
Technical Field
The invention relates to the technical field of heating furnaces, in particular to a total oxygen combustion system for a steel rolling heating furnace.
Background
A large amount of combustion equipment exists in the steel industry, an advanced combustion technology is developed, the energy utilization level is improved, and the most effective CO is2And one of pollutant emission reduction measures. The total oxygen combustion technology is an energy-saving combustion technology developed recently. The total oxygen combustion is that the traditional fuel-air combustion system is changed into a fuel-oxygen combustion system, when the oxygen purity in the fuel-oxygen system reaches 90% -100%, the system is called total oxygen combustion, because the combustion process does not involve nitrogen in the air, the combustion efficiency can be greatly improved, the emission of NOx in the combustion process can be reduced, and simultaneously, CO in the flue gas after combustion is carried out2The concentration of the (C) is high, the (C) is easy to recover and treat, the (C) is one of key technologies for realizing zero emission of carbon in the combustion process and controlling NOx emission in the twenty-first century, the (C) is also one of the energy-saving and huge potential energy-rich development fields, and the (C) is one of the hot spots for saving energy in the combustion technology of developed countries in the world.
The application of the foreign oxy-fuel combustion technology on the steel rolling heating furnace is started earlier, and the foreign oxy-fuel combustion technology goes through three stages of general oxy-fuel combustion, staged oxy-fuel combustion and flameless oxy-fuel combustion. A new generation of total oxygen flameless combustion technology and a series of products of a burner are developed at present and successfully applied to various heating furnaces of a steel rolling production line. The experimental research of the oxy-steel rolling heating furnace is started in China, but the practical production and application are rare.
At present, compared with a conventional air heating furnace, the total oxygen heating furnace which is put into use has the following advantages:
(1) energy conservation and emission reduction, and high thermal efficiency. After oxygen is used for combustion supporting instead of air, the nitrogen which is not used for combustion supporting and occupies the total amount of 4/5 does not enter the furnace any more, the nitrogen does not need to be reheated, and a large amount of fuel is saved. And the amount of flue gas generated after combustion is greatly reduced, the heat loss of the flue gas is greatly reduced, the pollutant discharge amount is reduced, and the heat efficiency is higher.
(2) The heat transfer efficiency is good, and the yield of the heating furnace is high. The oxygen combustion-supporting can reduce the ignition temperature of the fuel, accelerate the combustion reaction, improve the theoretical combustion temperature of the fuel, and greatly increase the radiation heat transfer capacity by improving the combustion temperature; meanwhile, the total oxygen combustion can also improve the radioactive gas CO in the combustion products2And H2O, the radiant heat transfer capacity of which is 2 times the radiant capacity of the air combustion products.
(3) Short heating time and less oxidation burning loss. The higher the oxygen concentration in the combustion supporting gas, the more complete the combustion and the shorter the heating time. The shorter the time for the surface of the steel billet in the high temperature section to contact with oxygen and participate in the reaction is, the less scale is generated.
(4) The total oxygen combustion-supporting can improve the theoretical combustion temperature of the fuel, and is beneficial to the reasonable utilization of low-calorific-value fuels such as blast furnace gas, producer gas, converter gas and the like.
At present, the application research of the total oxygen steel rolling heating furnace at home and abroad refers to Chinese patent with the reference number CN 201510734589.2: the invention relates to a system and a process for oxy-fuel combustion and carbon dioxide capture of a heating furnace, in particular to a system and a process for oxy-fuel combustion and carbon dioxide capture of CO in combustion waste gas of an oxy-fuel heating furnace2Capture process by which CO can be achieved2The high-efficiency trapping. The invention does not relate to a specific combustion process and method for an oxy-fuel furnace.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a total oxygen combustion system for a steel rolling heating furnace, aiming at improving the combustion efficiency and the heat transfer efficiency of the steel rolling heating furnace and achieving the purposes of improving the productivity, saving the fuel, reducing the emission and improving the product quality.
In order to achieve the purpose, the invention adopts the following technical scheme:
a total oxygen combustion system for a steel rolling heating furnace comprises a heating furnace, a fuel system, a combustion-supporting system, a nitrogen purging system, a smoke discharging system and a control system; the heating furnace comprises a preheating section, a heating section and a soaking section. The heating section and the soaking section are internally divided into an upper heating zone and a lower heating zone; the preheating section is not provided with a heating zone; the fuel system comprises a fuel pipeline and a fuel valve group; the combustion-supporting system comprises an oxygen pipeline and an oxygen valve bank; the nitrogen purging system comprises a nitrogen pipeline and a nitrogen valve; the smoke exhaust system comprises a smoke exhaust channel, a smoke exhaust valve and a chimney.
And the side walls of the upper heating area and the lower heating area of the heating section are provided with full-oxygen flameless combustors, and the full-oxygen flameless combustors are layered from top to bottom and arranged in a left-right staggered manner.
The side walls of the upper heating zone and the lower heating zone of the soaking section are provided with full-oxygen flameless combustors, and the full-oxygen flameless combustors are arranged in a vertically layered and horizontally staggered manner; and the end wall of the heating zone at the upper part of the soaking section is provided with a total oxygen flameless burner which is horizontally arranged in a single layer.
The control system comprises a blank tracking system, an intelligent temperature control system, a hearth pressure control system, a linkage alarm protection system and a blank heat-preservation system to be rolled.
Furthermore, an upper inclined plane retaining wall and a lower inclined plane retaining wall are arranged in front of and behind the preheating section.
Furthermore, the furnace walls of the preheating section, the heating section and the soaking section are all of a composite structure of multilayer refractory bricks and heat-preservation castable.
Further, the billet tracking system comprises a billet logistics information module and a billet temperature prediction module; the billet logistics information module comprises a billet position tracking model and a basic information acquisition model; the billet steel position tracking model realizes the position tracking of the billet steel in the whole process from the moment the billet steel enters the heating furnace to the moment the billet steel is discharged from the furnace finally; the basic information acquisition model realizes the acquisition of basic data of the charged blank, including blank number, blank size, weight, steel grade and heating curve; the billet temperature prediction module monitors real-time furnace temperature information and billet position information provided by the billet logistics information module, and the temperature of all billets in the heating furnace is calculated through a mathematical model built in the billet temperature prediction module; the mathematical model built in the steel billet temperature prediction module comprises a steel billet internal heat conduction model, a combustion setting model, a hearth heat transfer model and a thermophysical property calculation model; the billet temperature prediction is the whole process from the initial charging to the initial discharging of the billet; the billet temperature prediction module has an automatic learning function, and the overall accuracy is improved by carrying out feedback analysis on various parameters of a billet just entering the furnace and various parameters of the billet which are about to be discharged after the heating in the billet furnace is finished.
Furthermore, the heating section and the soaking section of the heating furnace are respectively provided with an intelligent temperature control system, each section is provided with an independent fuel branch pipe valve bank and an independent oxygen branch pipe valve bank, and the heat load of each section of the total-oxygen heating furnace is regulated and controlled through the fuel branch pipe valve bank and the oxygen branch pipe valve bank, so that the temperature is controlled independently in a segmented manner;
the intelligent temperature control system controls the fuel quantity and the oxygen quantity entering the total oxygen burners through a fuel flow regulating valve on a fuel pipeline in front of a nozzle and an oxygen flow regulating valve on an oxygen pipeline in front of the nozzle, the heat supply quantity of each total oxygen burner can be independently and accurately controlled, the precise heating of the steel billets is realized according to the steel billet heating curve, the steel billet heating quality is ensured, and the fuel is fully combusted;
the intelligent temperature control system adopts an improved double-cross amplitude limiting control mode, and the improved double-cross amplitude limiting control mode is as follows: a control system which takes the furnace temperature regulating loop as a main loop and regulates the fuel flow and the oxygen flow as an auxiliary loop; when the load changes, the upper limit amplitude and the lower limit amplitude are carried out on the fuel flow according to the actually measured oxygen flow, and the upper limit amplitude and the lower limit amplitude are also carried out on the oxygen flow according to the actually measured fuel flow; therefore, when the load increases or decreases, the fuel flow rate and the oxygen flow rate are restricted from each other, and alternately increased or decreased, so that the system can maintain a good air-fuel ratio even under dynamic conditions.
Furthermore, the hearth pressure control system adopts a control method combining proportional-integral control and fuzzy control; the control mode takes the deviation e and the deviation change rate d (e)/dt of the hearth pressure value measured on each section of the heating furnace and the hearth pressure set value as the input values of a proportional-integral controller and a fuzzy controller, the fuzzy controller firstly divides the input values into a plurality of grades, different numerical values fall on different grades, and the fuzzy controller adopts corresponding control strategies through the grade division of the input values; when the input value is lower than the threshold value, the pure fuzzy control has a steady-state error, and the output delta u of the proportional-integral controller is added into the output value u of the fuzzy control for compensation so as to eliminate the steady-state error of the output value of the fuzzy controller; the opening degree of the smoke exhaust valve is dynamically adjusted through a control mode combining fuzzy control and proportional-integral control, so that large fluctuation of the hearth pressure caused by mechanical operation of the heating furnace is avoided, and stable control over the hearth pressure is realized.
Furthermore, the interlocking alarm protection system comprises a power-off protection module, a hearth overtemperature protection module, a gas pressure low protection module and an oxygen pressure low protection module; when any one or more of power failure accidents, over-temperature of a hearth, over-low gas pressure and over-low oxygen pressure occur, the system automatically alarms, and automatically cuts off the fuel branch pipe valve bank, the oxygen branch pipe valve bank, the fuel main pipe valve bank and the oxygen main pipe valve bank, so that the interlocking alarm protection function is realized.
Further, the blank heat-preservation system to be rolled comprises a planned module to be rolled and an unplanned module to be rolled; and the control of cooling, heat preservation and reheating of the heating furnace during the period of waiting for rolling is realized through the blank heat preservation system to be rolled.
Compared with the prior art, the invention has the beneficial effects that:
1) by applying the oxy-fuel combustion technology, the combustion efficiency and the heat transfer efficiency of the heating furnace can be improved, and the purposes of improving the productivity, saving the fuel and reducing the emission are achieved.
2) The amount of flue gas generated by the total oxygen combustion is greatly reduced, the height of the hearth is correspondingly reduced, and the construction investment is saved.
3) The full-oxygen flameless combustion upper and lower sections of the heating section and the soaking section are arranged in a staggered manner, the output of each full-oxygen flameless combustor can be adjusted, and dynamic heat load adjustment in the subareas is realized;
4) the blank tracking system can provide real-time blank data, and the intelligent temperature control system can realize the full-flow intelligent temperature control according to the automatic adjustment and control supply mode of the fuel and oxygen locked and controlled by the blank real-time data infinitely approaching the target value.
5) The full-oxygen flameless combustion technology is adopted to realize dispersion combustion in the hearth, double-sided heating and staggered heat supply, the temperature field in the furnace is uniform, the temperature difference of a workpiece to be heated can be within +/-5 ℃ at any point, and the heating quality and performance of a rolled product are ensured;
6) the smoke exhaust valve is arranged on the smoke exhaust channel of the hearth, the smoke exhaust area is adjustable, and the furnace pressure is controllable and stable;
7) the furnace body adopts a full-sealing structure, and has reliable sealing performance and good sealing performance.
Drawings
FIG. 1 is a schematic flow diagram of the oxy-fuel combustion process for a steel rolling furnace according to the present invention.
FIG. 2 is a schematic view showing the external structure of a oxy-fuel combustion steel rolling heating furnace according to the present invention.
FIG. 3 is a schematic diagram of the internal structure of the furnace body of the oxy-fuel combustion steel rolling heating furnace.
Fig. 4 is a schematic diagram of a blank tracking system according to the present invention.
Fig. 5 is a schematic diagram of an intelligent temperature control system according to the present invention.
FIG. 6 is a schematic diagram of a furnace pressure control system according to the present invention.
Fig. 7 is a schematic diagram of a chain alarm protection system according to the present invention.
FIG. 8 is a schematic diagram of a blank heat-preservation system to be rolled according to the invention.
In the figure: 1. preheating section 2, heating section 3, soaking section 4, full-oxygen flameless combustor 5, fuel main pipe 6, fuel branch pipe I7, fuel branch pipe II 8, fuel branch pipe III 9, fuel pipe I10 before nozzle, fuel pipe II 11 before nozzle, fuel pipe III 12 before nozzle, fuel main pipe valve group 13, fuel branch pipe valve group I14, fuel branch pipe valve group II 15, fuel branch pipe valve group III 16, oxygen main pipe 17, oxygen branch pipe I18, oxygen branch pipe II 19, oxygen branch pipe III 20, oxygen pipe I21 before nozzle, oxygen pipe II 22 before nozzle, fuel pipe III 23 before nozzle, oxygen main pipe valve group 24, oxygen branch pipe valve group I25, oxygen branch pipe valve group II 26, oxygen branch pipe valve group III 27, exhaust flue 28, exhaust valve 29, chimney 30, upper inclined wall 31, lower inclined wall 32, flow regulating valve 33, flow meter 34, furnace wall 35, nitrogen pipeline 35 A nitrogen valve.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in figure 1, the total oxygen combustion system for the steel rolling heating furnace comprises a heating furnace, a fuel system, a combustion-supporting system, a nitrogen purging system, a smoke discharging system and a control system. The heating furnace comprises a preheating section 1, a heating section 2 and a soaking section 3. The heating section 2 and the soaking section 3 are divided into an upper heating zone and a lower heating zone. The preheating section 1 is not provided with a heating zone. The fuel system comprises a fuel pipeline and a fuel valve group. The combustion-supporting system comprises an oxygen pipeline and an oxygen valve bank. The nitrogen purge system includes a nitrogen line 35 and a nitrogen valve 36. The smoke evacuation system includes an exhaust flue 27, an exhaust valve 28 and a stack 29. The control system comprises a blank tracking system, an intelligent temperature control system, a hearth pressure control system and a linkage alarm protection system.
The fuel pipeline comprises a fuel main pipe 5, a fuel branch pipe I6, a fuel branch pipe II 7, a fuel branch pipe III 8, a fuel pipeline I9 before a nozzle, a fuel pipeline II 10 before the nozzle and a fuel pipeline III 11 before the nozzle. The fuel valve group comprises a fuel main pipe valve group 12, a fuel branch pipe valve group 13, a fuel branch pipe valve group two 14 and a fuel branch pipe valve group three 15. The fuel in the fuel main pipe 5 is supplied to the first fuel branch pipe 6, the second fuel branch pipe 7 and the third fuel branch pipe 8 through the fuel main pipe valve group 12. And the fuel in the fuel branch pipe I6 is sent into a fuel pipeline I9 before the nozzle through a fuel branch pipe valve group I13, and then the fuel is sent into the total oxygen flameless combustor 4 on the side wall of the heating section 2 through the fuel pipeline I9 before the nozzle. And the fuel in the fuel branch pipe II 7 is sent into a nozzle fuel pipeline II 10 of the soaking section 3 through a fuel branch pipe valve group II 14, and the fuel is sent into the full-oxygen flameless combustor 4 on the side wall of the soaking section 3 through the nozzle fuel pipeline II 10. And the fuel in the fuel branch pipe III 8 is sent into a nozzle fuel pipeline III 11 of the soaking section through a fuel branch pipe valve III 15, and the fuel is sent into the full-oxygen flameless combustor 4 at the end face of the soaking section through the nozzle fuel pipeline III 11. And an electric flow regulating valve 32 and a flowmeter 33 are arranged on the fuel pipeline in front of the nozzle.
The oxygen pipeline comprises an oxygen main pipe 16, an oxygen branch pipe I17, an oxygen branch pipe II 18, an oxygen branch pipe III 19, a mouth front oxygen pipeline I20, a mouth front oxygen pipeline II 21 and a mouth front oxygen pipeline III 22. The oxygen valve bank comprises an oxygen main pipe valve bank 23, an oxygen branch pipe valve bank 24, an oxygen branch pipe valve bank 25 and an oxygen branch pipe valve bank 26. The oxygen in the oxygen main pipe 16 is supplied to the first oxygen branch pipe 17, the second oxygen branch pipe 18 and the third oxygen branch pipe 19 through the oxygen main pipe valve group 23. And oxygen in the oxygen branch pipe I17 is sent into a nozzle oxygen pipeline I20 through an oxygen branch pipe valve I24, and then the oxygen is sent into the total oxygen flameless combustor 4 on the side wall of the heating section 2 through the nozzle oxygen pipeline I20. And oxygen in the oxygen branch pipe II 18 is sent into a nozzle oxygen pipeline II 21 of the soaking section 3 through an oxygen branch pipe valve II 25, and then the oxygen is sent into the total oxygen flameless combustor 4 on the side wall of the soaking section 3 through the nozzle oxygen pipeline II 21. And oxygen in the oxygen branch pipe III 19 is sent into a nozzle oxygen pipeline III 22 of the soaking section 3 through an oxygen branch pipe valve III 26, and then the oxygen is sent into the total oxygen flameless combustor 4 on the end face of the soaking section 3 through the nozzle oxygen pipeline III 22. And an electric flow regulating valve 32 and a flowmeter 33 are arranged on the oxygen pipeline in front of the nozzle.
The nitrogen purging system comprises a nitrogen pipeline 35 and a nitrogen valve 36, the nitrogen pipeline 35 is respectively connected to the fuel branch pipe and the oxygen branch pipe, and the nitrogen pipeline 35 is provided with the nitrogen valve 36. The nitrogen purging system purges when the heating furnace is overhauled and stopped, and removes residual fuel in the fuel branch pipe and residual oxygen in the oxygen branch pipe so as to be convenient for safe overhauling operation.
As shown in fig. 2, the total oxygen flameless burners 4 of the heating section 2 are arranged on the side wall of the heating section 2 in a staggered manner. The full-oxygen flameless combustor 4 of the soaking section is divided into an upper layer and a lower layer on the side wall of the soaking section 3 and is arranged in a left-right staggered mode. The total oxygen flameless combustor 4 is arranged in an upper layer and a lower layer, can realize the zone control of an upper heating zone and a lower heating zone, can strengthen the lower heating, and avoids the black mark of a rolled product caused by a furnace bottom cooling water pipe. The left and right staggered arrangement of the total-oxygen flameless combustors 4 can make the heat distribution in the hearth more uniform, and avoid the local over-burning or under-burning phenomenon of the product. The full-oxygen flameless burner 4 is horizontally arranged on the end face of the soaking section 3, so that heat can be supplemented to the soaking section 3, and the phenomenon that the heating temperature of the steel billet cannot reach the standard due to the fact that a furnace door is frequently opened to suck cold air is avoided.
As shown in fig. 3, the heating furnace is divided into a preheating section 1, a heating section 2 and a soaking section 3. The furnace walls 34 of the preheating section 1, the heating section 2 and the soaking section 3 are all of a multi-layer refractory brick and heat-insulating castable composite structure, can resist high temperature of 1500 ℃ and has good heat-insulating property. The preheating section 1 is provided with an upper inclined retaining wall 30 and a lower inclined retaining wall 31 in the front and at the back, the hearth area of the preheating section 1 is reduced through the inclined retaining walls, the flue gas flow rate in the preheating section 1 is increased, the convection heat transfer is enhanced, the billet preheating temperature is improved, the smoke exhaust temperature is reduced, and the heat efficiency of the heating furnace is improved.
As shown in fig. 4, the billet tracking system includes a billet logistics information module and a billet temperature prediction module. The billet logistics information module comprises a billet position tracking model and a basic information acquisition model. The billet position tracking model realizes the position tracking of the billet in the whole process from the moment the billet enters the heating furnace to the moment the billet is discharged from the furnace finally. The basic information acquisition model realizes the acquisition of basic data of the blank entering the furnace, including blank number, blank size, weight, steel grade and heating curve. The billet temperature prediction module monitors real-time furnace temperature information and billet position information provided by the billet logistics information module, and the temperature of all billets in the heating furnace is calculated through a mathematical model built in the billet temperature prediction module. The mathematical model built in the steel billet temperature prediction module comprises a steel billet internal heat conduction model, a combustion setting model, a hearth heat transfer model and a thermophysical property calculation model. The billet temperature prediction is the whole process from the beginning of the billet feeding to the beginning of the billet discharging. The billet temperature prediction module can automatically learn, and the overall accuracy is improved by carrying out feedback analysis on various parameters of a billet just entering the furnace and various parameters of the billet which is about to be discharged after the heating in the billet furnace is finished.
As shown in fig. 5, the intelligent temperature control system adopts an improved double-crossing amplitude limiting control mode, and takes a furnace temperature adjusting loop as a main loop, and adjusts the fuel flow and the oxygen flow as auxiliary loops. When the load changes, the fuel flow is subjected to upper and lower limiting amplitudes according to the actually measured oxygen flow, and the oxygen flow is also subjected to upper and lower limiting amplitudes according to the actually measured fuel flow. Therefore, when the load increases or decreases, the fuel flow rate and the oxygen flow rate are restricted from each other, and alternately increased or decreased, so that the system can maintain a good air-fuel ratio even under dynamic conditions.
The specific implementation mode is that the furnace temperature regulating loop takes a furnace temperature set value as an input variable, the furnace temperature set value is dynamically corrected by the real-time temperature of the steel billet calculated by the billet tracking system and then is used as an input value of a furnace temperature PID regulator, the input value in the furnace temperature PID regulator and the actual value of the furnace temperature are subjected to proportional/integral/differential operation, and the obtained output value A is used as the input value of the oxygen flow regulating loop and the fuel flow regulating loop. The fuel flow regulating circuit is provided with a high value selector HS1 and a low value selector LS 1. A high value selector HS2 and a low value selector LS2 are provided in the oxygen flow regulating circuit. In the fuel flow rate control circuit, a furnace temperature PID controller output signal A is compared with signals B and C obtained by multiplying a fuel flow rate calculated from an actually measured oxygen flow rate by a deviation coefficient K1 and a deviation coefficient K3, respectively, and selected by a high value selector HS1 and a low value selector LS1, and the selected value is used as a set value of the fuel flow rate controller. In the oxygen flow rate regulating circuit, the output signal A of the furnace temperature PID regulator is compared with the signals D and E obtained by multiplying the actually measured fuel flow rate by the deviation signal K2 and the deviation signal K4, selected by the high value selector HS2 and the low value selector LS2, multiplied by the flow range correction coefficient, and corrected by the excess air coefficient to be used as the set value of the oxygen flow rate regulator. Meanwhile, the oxygen-fuel ratio is corrected by the oxygen content of the flue gas, so that the optimal oxygen-fuel ratio is ensured. The fuel supply quantity of the fuel flow regulating valve and the oxygen supply quantity of the oxygen flow regulating valve are controlled by the fuel flow regulator and the oxygen flow regulator. When the system is in a stable state, the oxygen-fuel ratio is equal to a set value; in the transition stage, when the load is reduced, the oxygen-fuel ratio does not exceed the set upper limit value, and when the load is suddenly increased, the oxygen-fuel ratio is not lower than the lower limit value for preventing the black smoke. Thereby ensuring that the combustion process can be carried out in the optimal combustion area and achieving the purposes of energy conservation, complete combustion and pollution prevention. In the specific implementation process, the following three situations are described in detail:
case (a):
when the system is stable, the flow adjustment value is between the lower fuel flow limit B and the upper fuel flow limit C, and the double-cross system is in a balanced state, so that the fuel flow and oxygen flow signals are directly given by A.
Case (b):
when the furnace temperature is high and the load needs to be reduced, the value A is reduced, and for the gas side, A is more than B and less than C, and A is compared with B firstly. And comparing the value A with the value B through an HS1 high selection module, outputting a larger value B, comparing the value B with the value C through an LS1 low selection module, outputting a smaller value B, and outputting the value B as a flow set value to a gas flow regulation module, wherein the output is a lower fuel flow limit B. Wherein, B ═ FA × K3, C ═ FA × K1(FA is oxygen flow rate, preferably K3 ═ 0.94, and K1 ═ 1.04).
For the oxygen side, A is more than E and less than D, and A is compared with D first. And comparing the A value with the D value by an LS2 low selection module, outputting a smaller A value, comparing the A value with the E value by an HS2 high selection module, outputting a larger E value, and finally outputting the E value serving as a flow set value to an oxygen flow regulating module, wherein the output is an oxygen flow lower limit E. Wherein, D ═ FF × K4, E ═ FF × K2(FF is the fuel flow rate, preferably K4 ═ 1.06, K2 ═ 0.96).
Case (c):
when the furnace temperature is low and the load needs to be increased, the value A is increased, and for the gas side, A is more than C and more than B, and A is compared with B firstly. The A value and the B value are compared by an HS1 high value selector and then output a larger A value, then the A value and the C value are compared by an LS1 low value selector and then output a smaller C value, finally the C value is used as a flow set value and output to a gas flow regulating module, and at the moment, the output is a fuel flow upper limit C. Wherein, B ═ FA × K3, C ═ FA × K1(FA is oxygen flow, preferably K3 ═ 0.94, and K1 ═ 1.04).
For the oxygen side, A > D > E, A is first compared to D. And comparing the A value and the D value by an LS2 low value selector, outputting a smaller D value, comparing the D value and the E value by an HS2 high value selector, outputting a larger D value, and finally outputting the E value serving as a flow set value to an oxygen flow regulating module, wherein the output is an oxygen flow upper limit D. Wherein D ═ FF × K4, E ═ FF × K2(FF is the fuel flow rate, preferably K4 ═ 1.06, K2 ═ 0.96).
Regarding the set values of the gas and oxygen control loops, the deviation coefficients K1, K2, K3, K4 are selected according to the following principle:
oxygen gas increases first when the temperature rises. When the K4 is larger than the K1, the oxygen is increased more than the fuel when the fuel is increased, so that the fuel can be fully combusted, and black smoke is not emitted. The fuel is increased in advance when the temperature is reduced. At the moment, K3 is less than K2, and when the fuel is reduced, the reduction ratio of the fuel is more than that of the oxygen, so that the safety of a combustion system can be ensured.
By adopting the intelligent temperature control system, dynamic heat load adjustment can be flexibly realized, the temperature system curve of the workpiece is completely executed, and intelligent temperature control and optimized management and control of the whole process can be realized.
As shown in FIG. 6, the furnace pressure control system adopts a control method combining conventional proportional-integral control and fuzzy control. The control mode takes the deviation e and the deviation change rate d (e)/dt of the hearth pressure value measured on each section of the heating furnace and a hearth pressure set value as input values, the fuzzy controller firstly divides the input values into a plurality of grades, including large, medium, small and small, different values fall on different grades, and the fuzzy controller adopts corresponding control strategies through the grade division of the input values. When the input value is lower than a certain threshold value, the pure fuzzy control has a steady-state error, and the output delta u of proportional integral is added into the output value u of the fuzzy control for compensation so as to eliminate the steady-state error of the output value of the fuzzy controller. The opening of the smoke exhaust valve is dynamically adjusted through a control mode combining fuzzy control and conventional proportional-integral control, so that large fluctuation of the hearth pressure caused by mechanical operation of the heating furnace is avoided, and stable control of the hearth pressure is realized.
As shown in fig. 7, the interlock protection system includes a power-off protection module, a furnace over-temperature protection module, a gas pressure low protection module, and an oxygen pressure low protection module. When any one or more of power failure accidents, over-temperature of a hearth, over-low gas pressure and over-low oxygen pressure occur, the system automatically alarms, and automatically cuts off the fuel branch pipe valve bank, the oxygen branch pipe valve bank, the fuel main pipe valve bank and the oxygen main pipe valve bank, so that the interlocking alarm protection function is realized.
As shown in fig. 8, the blank heat preservation and rolling system includes a planned rolling module and an unplanned rolling module. The blank heat-preservation and rolling system automatically reduces the fuel consumption when rolling occurs, and rapidly reduces the furnace temperature to a proper low level to reduce consumption and avoid overheating and overburning accidents. Before rolling again, the blank heat-preservation and rolling-waiting system heats the discharged steel blank to a hot state with technological requirements in a short time, and the discharged steel blank is put into production on time, so that the influence on production caused by waiting for good burning is avoided. And under the normal rolling condition, the heated billet is subjected to temperature reduction, heat preservation and re-temperature rise control in the waiting period by the planning waiting-to-be-rolled module according to the planning waiting-to-be-rolled time. When the rolling mill has abnormal rolling conditions such as electrical faults, roll changing, rolling stopping and the like, the blank heat-preservation to-be-rolled system executes an unplanned to-be-rolled module. And under the condition that the unplanned waiting rolling time is uncertain, the unplanned waiting rolling module executes a very slow cooling process, and meanwhile, the steel billet temperature prediction module is combined to perform unsteady heating calculation, and when the steel billet is put into production again, the steel billet is rapidly heated to a discharging state according to accurate steel billet thermal state data.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (10)
1. A total oxygen combustion system for a steel rolling heating furnace comprises a heating furnace, a fuel system, a combustion-supporting system, a nitrogen purging system, a smoke discharging system and a control system; the heating furnace comprises a preheating section, a heating section and a soaking section. The heating section and the soaking section are internally divided into an upper heating zone and a lower heating zone; the preheating section is not provided with a heating zone; the fuel system comprises a fuel pipeline and a fuel valve group; the combustion-supporting system comprises an oxygen pipeline and an oxygen valve bank; the nitrogen purging system comprises a nitrogen pipeline and a nitrogen valve; the smoke exhaust system comprises a smoke exhaust channel, a smoke exhaust valve and a chimney;
the device is characterized in that full-oxygen flameless combustors are arranged on the side walls of an upper heating zone and a lower heating zone of the heating section, and the full-oxygen flameless combustors are vertically layered and horizontally staggered;
the side walls of the upper heating zone and the lower heating zone of the soaking section are provided with full-oxygen flameless combustors, and the full-oxygen flameless combustors are arranged in a vertically layered and horizontally staggered manner; the end wall of the heating zone at the upper part of the soaking section is provided with a total oxygen flameless burner which is horizontally arranged in a single layer;
the control system comprises a blank tracking system, an intelligent temperature control system, a hearth pressure control system, a linkage alarm protection system and a blank heat-preservation system to be rolled.
2. The oxy-fuel combustion system for a steel rolling heating furnace according to claim 1, wherein the preheating section is provided with an upper inclined retaining wall and a lower inclined retaining wall at the front and rear.
3. The oxy-fuel combustion system for the steel rolling heating furnace according to claim 1, wherein the furnace walls of the preheating section, the heating section and the soaking section are all of a composite structure of multilayer refractory bricks and heat preservation castable.
4. The oxy-fuel combustion system for a steel rolling heating furnace of claim 1, wherein the billet tracking system comprises a billet logistics information module and a billet temperature prediction module; the billet logistics information module comprises a billet position tracking model and a basic information acquisition model; the billet steel position tracking model realizes the position tracking of the billet steel in the whole process from the moment the billet steel enters the heating furnace to the moment the billet steel is discharged from the furnace finally; the basic information acquisition model realizes the acquisition of basic data of the charged blank, including blank number, blank size, weight, steel grade and heating curve; the billet temperature prediction module monitors real-time furnace temperature information and billet position information provided by the billet logistics information module, and the temperature of all billets in the heating furnace is calculated through a mathematical model built in the billet temperature prediction module; the mathematical model built in the steel billet temperature prediction module comprises a steel billet internal heat conduction model, a combustion setting model, a hearth heat transfer model and a thermophysical property calculation model; the billet temperature prediction is the whole process from the initial charging to the initial discharging of the billet; the billet temperature prediction module has an automatic learning function, and the overall accuracy is improved by carrying out feedback analysis on various parameters of a billet just entering the furnace and various parameters of the billet which are about to be discharged after the heating in the billet furnace is finished.
5. The oxy-fuel combustion system for a steel rolling heating furnace according to claim 1, wherein the heating section and the soaking section of the heating furnace are respectively provided with an intelligent temperature control system, each section is provided with an independent fuel branch pipe valve bank and an independent oxygen branch pipe valve bank, and the thermal load of each section of the oxy-fuel heating furnace is regulated and controlled through the fuel branch pipe valve bank and the oxygen branch pipe valve bank to realize temperature subsection independent control;
the intelligent temperature control system controls the fuel quantity and the oxygen quantity entering the total oxygen combustor through the fuel flow regulating valve on the fuel pipeline in front of the nozzle and the oxygen flow regulating valve on the oxygen pipeline in front of the nozzle, the heat supply quantity of each total oxygen combustor can be accurately controlled independently, the precise heating of the steel billet is realized according to the steel billet heating curve, the steel billet heating quality is ensured, and the fuel is fully combusted.
6. The oxy-fuel combustion system for a steel rolling heating furnace according to claim 1, wherein the intelligent temperature control system specifically comprises: the furnace temperature regulating loop takes a furnace temperature set value as an input variable, the furnace temperature set value is dynamically corrected by the real-time temperature of the steel billet calculated by the billet tracking system and then is used as an input value of a furnace temperature PID regulator, the input value in the furnace temperature PID regulator and the actual furnace temperature value are subjected to proportional/integral/differential operation, and an obtained output value A is used as the input value of the oxygen flow regulating loop and the fuel flow regulating loop. The fuel flow regulating circuit is provided with a high value selector HS1 and a low value selector LS 1. A high value selector HS2 and a low value selector LS2 are provided in the oxygen flow regulating circuit. In the fuel flow rate control circuit, a furnace temperature PID controller output signal A is compared with signals B and C obtained by multiplying a fuel flow rate calculated from an actually measured oxygen flow rate by a deviation coefficient K1 and a deviation coefficient K3, respectively, and selected by a high value selector HS1 and a low value selector LS1, and the selected value is used as a set value of the fuel flow rate controller. In the oxygen flow rate regulating circuit, the output signal A of the furnace temperature PID regulator is compared with the signals D and E obtained by multiplying the actually measured fuel flow rate by the deviation signal K2 and the deviation signal K4, selected by the high value selector HS2 and the low value selector LS2, multiplied by the flow range correction coefficient, and corrected by the excess air coefficient to be used as the set value of the oxygen flow rate regulator. Meanwhile, the oxygen-fuel ratio is corrected by the oxygen content of the flue gas, so that the optimal oxygen-fuel ratio is ensured. The fuel supply quantity of the fuel flow regulating valve and the oxygen supply quantity of the oxygen flow regulating valve are controlled by the fuel flow regulator and the oxygen flow regulator. When the system is in a stable state, the oxygen-fuel ratio is equal to a set value; in the transition stage, when the load is reduced, the oxygen-fuel ratio does not exceed the set upper limit value, and when the load is suddenly increased, the oxygen-fuel ratio is not lower than the lower limit value for preventing the black smoke. Thereby ensuring that the combustion process can be carried out in the optimal combustion area and achieving the aims of energy conservation, complete combustion and pollution prevention.
7. The oxy-fuel combustion system for a steel rolling heating furnace of claim 6, wherein the intelligent temperature control system comprises the following conditions:
case (a):
when the system is stable, the flow adjustment value is positioned between the lower limit B of the fuel flow and the upper limit C of the fuel flow, and the double-cross system is in a balanced state, so that the signals of the fuel flow and the oxygen flow are directly given out by the output signal A of the furnace temperature PID regulator;
case (b):
when the furnace temperature is high and the load needs to be reduced, the value A is reduced, and for the gas side, A is more than B and less than C, and A is compared with B; the value A and the value B are compared by an HS1 high selection module and then output a larger value B, then the value B and the value C are compared by an LS1 low selection module and then output a smaller value B, and finally the value B is used as a flow set value and output to a gas flow regulation module, and at the moment, the output is a fuel flow lower limit B; wherein, B is FA K3, C is FA K1, and FA is oxygen flow rate;
for the oxygen side, A is more than E and less than D, and A is compared with D firstly; comparing the value A and the value D by an LS2 low selection module, outputting a smaller value A, comparing the value A and the value E by an HS2 high selection module, outputting a larger value E, and finally outputting the value E as a flow set value to an oxygen flow regulation module, wherein the output is an oxygen flow lower limit E; wherein, D ═ FF × K4, E ═ FF × K2, FF is the fuel flow;
case (c):
when the furnace temperature is low and the load needs to be increased, the value A is increased, and for the gas side, A is more than C and more than B, and A is compared with B; the A value and the B value are compared by an HS1 high value selector and then output a larger A value, then the A value and the C value are compared by an LS1 low value selector and then output a smaller C value, and finally the C value is used as a flow set value and output to a gas flow regulating module, and at the moment, the output is a fuel flow upper limit C; wherein B ═ FA × K3, C ═ FA × K1; FA is oxygen flow;
for the oxygen side, A is more than D and more than E, and A is compared with D; the value A and the value D are compared by an LS2 low value selector and then a smaller value D is output, then the value D and the value E are compared by an HS2 high value selector and then a larger value D is output, finally the value E is used as a flow set value and is output to an oxygen flow regulating module, and at the moment, the output is an oxygen flow upper limit D; wherein D ═ FF × K4, E ═ FF × K2, and FF is the fuel flow rate.
8. The oxy-fuel combustion system for a steel rolling heating furnace of claim 1, wherein the hearth pressure control system adopts a control method combining proportional-integral control and fuzzy control; in the control mode, the deviation e and the deviation change rate d (e)/dt of the hearth pressure value measured on each section of the heating furnace and the hearth pressure set value are used as input values of a proportional-integral controller and a fuzzy controller, the fuzzy controller firstly divides the input values into five grades, different numerical values fall on different grades, and the fuzzy controller adopts corresponding control strategies through the grade division of the input values; when the input value is lower than the threshold value, the pure fuzzy control has a steady-state error, and the output delta u of the proportional-integral controller is added into the output value u of the fuzzy control for compensation so as to eliminate the steady-state error of the output value of the fuzzy controller; the opening degree of the smoke exhaust valve is dynamically adjusted through a control mode combining fuzzy control and proportional-integral control, so that large fluctuation of hearth pressure caused by mechanical operation of the heating furnace is avoided, and stable control over the hearth pressure is realized.
9. The oxy-fuel combustion system for the steel rolling heating furnace of claim 1, wherein the interlock alarm protection system comprises a power-off protection module, a hearth over-temperature protection module, a gas pressure low protection module and an oxygen pressure low protection module; when any one or more of power failure accidents, over-temperature of a hearth, over-low gas pressure and over-low oxygen pressure occur, the system automatically alarms, and automatically cuts off the fuel branch pipe valve bank, the oxygen branch pipe valve bank, the fuel main pipe valve bank and the oxygen main pipe valve bank, so that the interlocking alarm protection function is realized.
10. The oxy-fuel combustion system for a steel rolling heating furnace of claim 1, wherein the blank heat preservation system to be rolled comprises a planned module to be rolled and an unplanned module to be rolled; the control of temperature reduction, heat preservation and re-temperature rise of the heating furnace during the period of waiting for rolling is realized through the blank heat preservation system to be rolled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210358884.2A CN114688868B (en) | 2022-04-07 | Total oxygen combustion system for steel rolling heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210358884.2A CN114688868B (en) | 2022-04-07 | Total oxygen combustion system for steel rolling heating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114688868A true CN114688868A (en) | 2022-07-01 |
| CN114688868B CN114688868B (en) | 2024-05-31 |
Family
ID=
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116398878A (en) * | 2023-06-01 | 2023-07-07 | 南京思墨能源科技有限公司 | Combined type total oxygen combustion system for steel rolling heating furnace and combustion method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05264027A (en) * | 1992-03-18 | 1993-10-12 | Toshiba Corp | Combustion control method with double cross limit process |
| JP2008095170A (en) * | 2005-10-31 | 2008-04-24 | Jfe Steel Kk | Method for producing sintered ore and sintering machine therefor |
| CN102364252A (en) * | 2011-11-14 | 2012-02-29 | 北京首钢自动化信息技术有限公司 | Automatic intelligent double cross limiting range combustion control method for heating furnace |
| CN106766883A (en) * | 2016-12-23 | 2017-05-31 | 鞍钢集团信息产业（大连）工程有限公司 | A kind of recuperative heater optimum combustion control system and method |
| CN209069023U (en) * | 2018-11-13 | 2019-07-05 | 四川德胜集团钒钛有限公司 | A kind of heater for rolling steel waste heat recycling system |
| CN110438331A (en) * | 2019-08-14 | 2019-11-12 | 山东莱钢永锋钢铁有限公司 | A kind of heating furnace autocombustion system |
| CN110793032A (en) * | 2019-09-30 | 2020-02-14 | 鞍钢股份有限公司 | Oxygen-enriched combustion system of heating furnace and control method thereof |
| CN111964468A (en) * | 2020-08-04 | 2020-11-20 | 鞍钢股份有限公司 | Steel rolling heating furnace premixing oxygen-enriched combustion system and method |
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05264027A (en) * | 1992-03-18 | 1993-10-12 | Toshiba Corp | Combustion control method with double cross limit process |
| JP2008095170A (en) * | 2005-10-31 | 2008-04-24 | Jfe Steel Kk | Method for producing sintered ore and sintering machine therefor |
| CN102364252A (en) * | 2011-11-14 | 2012-02-29 | 北京首钢自动化信息技术有限公司 | Automatic intelligent double cross limiting range combustion control method for heating furnace |
| CN106766883A (en) * | 2016-12-23 | 2017-05-31 | 鞍钢集团信息产业（大连）工程有限公司 | A kind of recuperative heater optimum combustion control system and method |
| CN209069023U (en) * | 2018-11-13 | 2019-07-05 | 四川德胜集团钒钛有限公司 | A kind of heater for rolling steel waste heat recycling system |
| CN110438331A (en) * | 2019-08-14 | 2019-11-12 | 山东莱钢永锋钢铁有限公司 | A kind of heating furnace autocombustion system |
| CN110793032A (en) * | 2019-09-30 | 2020-02-14 | 鞍钢股份有限公司 | Oxygen-enriched combustion system of heating furnace and control method thereof |
| CN111964468A (en) * | 2020-08-04 | 2020-11-20 | 鞍钢股份有限公司 | Steel rolling heating furnace premixing oxygen-enriched combustion system and method |
Non-Patent Citations (1)
| Title |
|---|
| 徐德龙主编: "《材料工程基础》", 武汉理工大学出版社, pages: 315 - 316 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116398878A (en) * | 2023-06-01 | 2023-07-07 | 南京思墨能源科技有限公司 | Combined type total oxygen combustion system for steel rolling heating furnace and combustion method thereof |
| CN116398878B (en) * | 2023-06-01 | 2024-03-12 | 南京林普热能科技有限公司 | Combined type total oxygen combustion system for steel rolling heating furnace and combustion method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110793032B (en) | Oxygen-enriched combustion system of heating furnace and control method thereof | |
| CN102242249B (en) | Heating device for improving heating quality of steel billets and using method thereof | |
| CN101561224B (en) | Method for controlling combustion atmosphere in large-scale walking beam type plate blank heating furnace | |
| CN104017981B (en) | A kind of continuous casting steel billet heating process of heat accumulating type roller bottom heating furnace | |
| CN112795716B (en) | Efficient and practical hot blast stove burning control method | |
| CN112710161A (en) | Pure oxygen combustion control system and control method of steel rolling heating furnace | |
| CN108444297A (en) | A kind of heater for rolling steel furnace atmosphere method of adjustment | |
| WO2019042155A1 (en) | Plasma heating-based temperature regulation method and device for blast furnace hot air system | |
| CN110157872A (en) | A kind of heating means reducing recuperative heater slab burn out rate | |
| CN112239797A (en) | Large blast furnace top combustion type hot blast furnace vault temperature control technology | |
| CN218723229U (en) | Combined combustion system of total oxygen heating furnace | |
| CN114688868B (en) | Total oxygen combustion system for steel rolling heating furnace | |
| CN114688868A (en) | Total oxygen combustion system for steel rolling heating furnace | |
| CN102381830B (en) | A kind of method and system of supporting combustion by using oxygen-enriched air in production of float glass | |
| CN101942574B (en) | Pulse-combustion heat accumulating type metal magnesium reduction furnace | |
| CN100397021C (en) | Method of improving the temperature profile of a furnace | |
| CN214655158U (en) | Rotary hearth furnace system for preparing metallized pellets based on oxygen-enriched combustion | |
| CN211177906U (en) | Double-flame heating and smoke-discharging adjustable trolley type heating furnace | |
| CN110763011A (en) | Double-flame heating and smoke exhaust adjustable trolley type heating furnace and heating temperature control method | |
| CN209541411U (en) | A kind of Two-cuff Technique roller hearth type heating furnace | |
| CN109579044B (en) | Air-fuel ratio dynamic feedforward combustion control method for walking beam furnace | |
| CN202201922U (en) | Digital pulse type thermal treatment furnace | |
| CN114908203B (en) | Method, device and application for electrically heating reducing gas | |
| CN105645792A (en) | Method for roasting lime with blast furnace gas in sleeve lime kiln | |
| CN112393599A (en) | Tangential curtain cooling type gas injection sintering machine and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |