CN114688868B - Total oxygen combustion system for steel rolling heating furnace - Google Patents
Total oxygen combustion system for steel rolling heating furnace Download PDFInfo
- Publication number
- CN114688868B CN114688868B CN202210358884.2A CN202210358884A CN114688868B CN 114688868 B CN114688868 B CN 114688868B CN 202210358884 A CN202210358884 A CN 202210358884A CN 114688868 B CN114688868 B CN 114688868B
- Authority
- CN
- China
- Prior art keywords
- value
- oxygen
- fuel
- heating
- 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.)
- Active
Links
- 239000001301 oxygen Substances 0.000 title claims abstract description 183
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 183
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 166
- 238000010438 heat treatment Methods 0.000 title claims abstract description 126
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 72
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 61
- 239000010959 steel Substances 0.000 title claims abstract description 61
- 238000005096 rolling process Methods 0.000 title claims abstract description 49
- 239000000446 fuel Substances 0.000 claims abstract description 168
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000002791 soaking Methods 0.000 claims abstract description 34
- 239000000779 smoke Substances 0.000 claims abstract description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 23
- 238000004321 preservation Methods 0.000 claims abstract description 14
- 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 7
- 239000002356 single layer Substances 0.000 claims abstract description 3
- 230000001105 regulatory effect Effects 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 15
- 239000010410 layer Substances 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 238000013178 mathematical model Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 230000006870 function Effects 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 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
- 238000001816 cooling Methods 0.000 claims description 3
- 239000002737 fuel gas Substances 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 238000012937 correction Methods 0.000 claims description 2
- 239000013589 supplement Substances 0.000 claims 1
- 230000007704 transition Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 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
- 238000005192 partition Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000005855 radiation Effects 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
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 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
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010763 heavy fuel oil Substances 0.000 description 1
- 229910052742 iron Inorganic materials 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
- 230000002285 radioactive effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Control Of Heat Treatment Processes (AREA)
- Regulation And Control Of Combustion (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; the heating furnace comprises a preheating section, a heating section and a soaking section. The side walls of the upper heating zone and the lower heating zone of the heating section are provided with full-oxygen flameless burners which are layered up and down and are staggered left and right. The side walls of the upper heating zone and the lower heating zone of the soaking section are provided with full-oxygen flameless burners which are layered up and down and staggered left and right; the end wall of the heating area 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 chain alarm protection system and a blank heat preservation waiting rolling system. Aims to improve the combustion efficiency and the heat transfer efficiency of the steel rolling heating furnace, and achieve the purposes 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
The iron and steel industry has a large amount of combustion equipment, develops advanced combustion technology, improves the energy utilization level, and is one of the most effective CO 2 and pollutant emission reduction measures. The oxy-fuel combustion technology is an energy-saving combustion technology developed recently. The total oxygen combustion changes the traditional fuel-air combustion system into a fuel-oxygen combustion system, when the oxygen purity in the fuel-oxygen system reaches 90% -100%, the fuel-air combustion system is called total oxygen combustion, the combustion process is free of nitrogen in the air, so that the combustion efficiency can be greatly improved, the emission of NOx in the combustion process is reduced, meanwhile, the concentration of CO 2 in the flue gas after combustion is high, the recovery and the treatment are easy, the fuel-air combustion system is one of key technologies for realizing the carbon zero emission in the combustion process and controlling the NOx emission in twenty-first-generation era, and the fuel-air combustion system is an energy-saving development field with huge potential, and is one of hot points for saving the combustion technology in developed countries in the world.
The foreign total oxygen combustion technology is applied to a steel rolling heating furnace for early start, and is subjected to three stages of general total oxygen combustion, graded total oxygen combustion and flameless total oxygen combustion. A new generation of total oxygen flameless combustion technology and burner series products have been developed at present and are successfully applied to various heating furnaces of a steel rolling production line. Experimental research on a total oxygen steel rolling heating furnace has been started in China, but practical production and application are rare.
Currently, the total oxygen heating furnace has the following advantages compared with the conventional air heating furnace:
(1) Energy saving and emission reduction, and high heat efficiency. After oxygen is adopted to replace air for supporting combustion, nitrogen which accounts for 4/5 of the total air and is not supported by combustion does not enter the furnace, nitrogen is not required to be heated, and a large amount of fuel is saved. And the smoke quantity generated after combustion is greatly reduced, the heat loss of smoke exhaust is greatly reduced, the pollutant discharge quantity is reduced, and the heat efficiency is higher.
(2) The heat transfer efficiency is good, and the heating furnace yield is high. The combustion-supporting oxygen can reduce the ignition temperature of the fuel, accelerate the combustion reaction speed, improve the theoretical combustion temperature of the fuel, and greatly increase the radiation heat transfer capability by improving the combustion temperature; meanwhile, the content of radioactive gases CO 2 and H 2 O in the combustion products can be increased by the oxy-fuel combustion, and the radiation heat transfer capacity of the oxy-fuel combustion is 2 times of that 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 that the surface of the high-temperature section billet is contacted with oxygen and participates in the reaction, the less iron oxide scale is generated.
(4) The full oxygen combustion-supporting can improve the theoretical combustion temperature of the fuel, and is beneficial to the reasonable utilization of low-heat-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 is carried out on Chinese patent with the public reference number of CN 201510734589.2: the invention discloses a heating furnace oxy-fuel combustion and carbon dioxide capturing system and a process, and relates to a CO 2 capturing process in combustion waste gas of an oxy-fuel heating furnace, and the process can realize efficient CO 2 capturing. The invention is not directed to a specific combustion process and method of a oxy-fuel furnace.
Disclosure of Invention
In order to solve the technical problems of the background technology, the invention provides a total oxygen combustion system for a steel rolling heating furnace, which aims to improve the combustion efficiency and the heat transfer efficiency of the steel rolling heating furnace and achieve the purposes of improving the productivity, saving the fuel, reducing the emission and improving the product quality.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
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, a heating section and a soaking section. The heating section and the soaking section are internally divided into an upper heating area and a lower heating area; 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 group; the nitrogen purging system comprises a nitrogen pipeline and a nitrogen valve; the smoke exhaust system comprises a smoke exhaust duct, a smoke exhaust valve and a chimney.
And the side walls of the upper heating zone and the lower heating zone of the heating section are provided with full-oxygen flameless burners which are arranged in a staggered manner in an up-and-down layering manner.
The side walls of the upper heating zone and the lower heating zone of the soaking section are provided with full-oxygen flameless burners which are arranged in a staggered manner in an up-and-down layering manner; the end wall of the heating area 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 chain alarm protection system and a blank heat preservation and rolling system.
Further, an upper inclined surface retaining wall and a lower inclined surface retaining wall are arranged in front of and behind the preheating section.
Further, the furnace walls of the preheating section, the heating section and the soaking section all adopt a multi-layer refractory brick and heat preservation castable composite structure.
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 position tracking model realizes the position tracking of the billet in the whole process from the moment of entering the heating furnace to the moment of discharging the billet finally; the basic information acquisition model is used for acquiring basic data of a blank to be charged, including a blank number, a blank size, a weight, a steel grade and a heating curve; the steel billet temperature prediction module monitors the real-time furnace temperature information and the steel billet position information provided by the steel billet logistics information module, and calculates the temperature of all steel billets in the heating furnace through a mathematical model built in the steel 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 calculation model; the steel billet temperature prediction is the whole process from the steel billet just entering the furnace to just exiting the furnace; the steel billet temperature prediction module has an automatic learning function, and feedback analysis is carried out on various parameters of steel billets just entering a furnace and various parameters of steel billets just coming out of the furnace after the heating in the furnace is completed, so that the overall accuracy is improved.
Further, 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 group and an independent oxygen branch pipe valve group, and the heat load of each section of the total oxygen heating furnace is regulated and controlled through the fuel branch pipe valve group and the oxygen branch pipe valve group, 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 full-oxygen burner through the fuel flow regulating valve on the fuel pipe in front of the nozzle and the oxygen flow regulating valve on the oxygen pipe in front of the nozzle, and the heat supply quantity of each full-oxygen burner can be independently and accurately controlled, so that the billet is accurately heated according to the billet heating curve, the 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 auxiliary loops; when the load changes, the fuel flow is limited up and down according to the actually measured oxygen flow, and the oxygen flow is limited up and down according to the actually measured fuel flow; thus, as the load increases or decreases, the fuel flow and the oxygen flow limit each other, alternately increasing or decreasing, so that the system maintains a good air-fuel ratio even in a dynamic situation.
Further, the hearth pressure control system adopts a control method of combining proportional integral control with 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 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 values fall on different grades, and the fuzzy controller adopts corresponding control strategies through the grading of the input values; when the input value is lower than the threshold value, the steady-state error exists in the simple fuzzy control, and the output Deltau of the proportional integral controller is added into the fuzzy control output value u to compensate so as to eliminate the steady-state error of the fuzzy controller output value; the opening degree of the smoke exhaust valve is dynamically adjusted in a control mode of combining fuzzy control and proportional integral control, so that larger fluctuation of the hearth pressure caused by mechanical operation of the heating furnace is avoided, and stable control of the hearth pressure is realized.
Further, the interlocking alarm protection system comprises a power-off protection module, a hearth overtemperature protection module, a fuel gas pressure low protection module and an oxygen pressure low protection module; when any one or more of the conditions of power failure accident, 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 rolling system comprises a planned rolling module and an unplanned rolling module; the control of cooling, heat preservation and re-heating of the heating furnace during the rolling process 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 using 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 flue gas amount generated by the oxy-fuel combustion is greatly reduced, the height of the hearth is correspondingly reduced, and the construction investment is saved.
3) The heating section and the soaking section are arranged in a staggered way in an upper-lower partition manner through the total-oxygen flameless combustion, the output of each total-oxygen flameless combustor is adjustable, and the dynamic heat load adjustment in the partition is realized;
4) The blank tracking system can provide blank real-time data, and the intelligent temperature control system can realize intelligent temperature control of the whole process according to the fuel and oxygen automatic regulation and control supply mode of the blank real-time data, which is controlled by locking and approaching to the target value in an infinite way.
5) The full-oxygen flameless combustion technology is adopted to realize the diffusion combustion in the hearth, double-sided heating and staggered heat supply, the temperature field in the hearth is uniform, the uniform temperature heating effect of the heated workpiece with the temperature difference within +/-5 ℃ at any point is achieved, and the heating quality and performance of the rolled product are ensured;
6) A smoke exhaust valve is arranged on a hearth smoke exhaust channel, 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 chart of a total oxygen combustion process for a steel rolling heating furnace according to the present invention.
FIG. 2 is a schematic diagram of the external structure of a steel rolling furnace with oxy-fuel combustion 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-preserving rolling system according to the invention.
In the figure: 1. preheating section 2, heating section 3, flame-free burner 5, fuel manifold 6, fuel manifold 7, fuel manifold 8, fuel manifold 9, forward of mouth fuel line 10, forward of mouth fuel line 11, forward of mouth fuel line 12, fuel manifold valve block 13, fuel manifold valve block 14, fuel manifold valve block 15, fuel manifold valve block 16, oxygen manifold 17, oxygen manifold 18, oxygen manifold 19, oxygen manifold 20, forward of mouth oxygen line 21, forward of mouth oxygen line 22, forward of mouth fuel line 23, oxygen manifold valve block 24, oxygen manifold valve block 25, oxygen manifold valve block 26, oxygen manifold valve block 27, flue 28, smoke evacuation valve 29, chimney 30, upper slope retaining wall 31, lower slope retaining wall 32, flow regulating valve 33, flow meter 34, furnace wall 35, nitrogen gas pipe 36.
Detailed Description
The following detailed description of the embodiments of the invention is provided with reference to the accompanying drawings.
As shown in fig. 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 internally 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 includes a fuel pipe and a fuel valve block. The combustion-supporting system comprises an oxygen pipeline and an oxygen valve group. The nitrogen purge system includes a nitrogen line 35 and a nitrogen valve 36. The smoke evacuation system comprises a smoke evacuation duct 27, a smoke evacuation valve 28 and a chimney 29. The control system comprises a blank tracking system, an intelligent temperature control system, a hearth pressure control system and a chain alarm protection system.
The fuel pipeline comprises a fuel main pipe 5, a first fuel branch pipe 6, a second fuel branch pipe 7, a third fuel branch pipe 8, a first pre-nozzle fuel pipeline 9, a second pre-nozzle fuel pipeline 10 and a third pre-nozzle fuel pipeline 11. The fuel valve group comprises a fuel main valve group 12, a first fuel branch valve group 13, a second fuel branch valve group 14 and a third fuel branch valve group 15. The fuel in the fuel manifold 5 is respectively supplied to a first fuel branch pipe 6, a second fuel branch pipe 7 and a third fuel branch pipe 8 through a fuel manifold valve group 12. The fuel in the first fuel branch pipe 6 is sent to the first fuel pipeline 9 in front of the mouth through the first fuel branch pipe valve group 13, and then the fuel is sent to the total oxygen flameless burner 4 on the side wall of the heating section 2 through the first fuel pipeline 9 in front of the mouth. The fuel in the second fuel branch pipe 7 is sent to the second fuel pipeline 10 in front of the mouth of the soaking section 3 through the second fuel branch pipe valve group 14, and then the fuel is sent to the total oxygen flameless burner 4 on the side wall of the soaking section 3 through the second fuel pipeline 10 in front of the mouth. The fuel in the fuel branch pipe III 8 is sent to a fuel pipeline III 11 in front of the mouth of the soaking section through a fuel branch pipe valve group III 15, and then the fuel is sent to the total oxygen flameless burner 4 on the end face of the soaking section through the fuel pipeline III 11 in front of the mouth. The fuel line in front of the mouth is provided with an electric flow regulating valve 32 and a flowmeter 33.
The oxygen pipeline comprises an oxygen main pipe 16, an oxygen branch pipe 17, an oxygen branch pipe 18, an oxygen branch pipe 19, a front-mouth oxygen pipeline 20, a front-mouth oxygen pipeline 21 and a front-mouth oxygen pipeline 22. The oxygen valve group comprises an oxygen main pipe valve group 23, an oxygen branch pipe valve group I24, an oxygen branch pipe valve group II 25 and an oxygen branch pipe valve group III 26. Oxygen in the oxygen manifold 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 manifold valve group 23. Oxygen in the first oxygen branch pipe 17 is sent to the first oxygen pipeline 20 in front of the mouth through the first oxygen branch pipe valve group 24, and then the oxygen is sent to the total oxygen flameless burner 4 on the side wall of the heating section 2 through the first oxygen pipeline 20 in front of the mouth. Oxygen in the second oxygen branch pipe 18 is sent to a second oxygen pipeline 21 in front of the mouth of the soaking section 3 through a second oxygen branch pipe valve group 25, and oxygen is sent to the total oxygen flameless burner 4 on the side wall of the soaking section 3 through the second oxygen pipeline 21 in front of the mouth. Oxygen in the oxygen branch pipe III 19 is sent to a front-mouth oxygen pipeline III 22 of the soaking section 3 through an oxygen branch pipe valve group III 26, and then the oxygen is sent to the total oxygen flameless burner 4 on the end face of the soaking section 3 through the front-mouth oxygen pipeline III 22. An electric flow regulating valve 32 and a flowmeter 33 are arranged on the oxygen pipe in front of the mouth.
The nitrogen purging system comprises a nitrogen pipeline 35 and a nitrogen valve 36, wherein the nitrogen pipeline 35 is respectively connected with a fuel branch pipe and an oxygen branch pipe, and the nitrogen valve 36 is arranged on the nitrogen pipeline 35. The nitrogen purging system purges when the heating furnace is overhauled and stopped, and eliminates residual fuel in the fuel branch pipe and residual oxygen in the oxygen branch pipe so as to ensure safe overhauling operation.
As shown in fig. 2, the oxy-fuel flameless burner 4 of the heating section 2 is arranged on the side wall of the heating section 2 in an up-down and left-right staggered manner. The total oxygen flameless burner 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 way. The total oxygen flameless burner 4 is arranged in an upper layer and a lower layer, so that the upper heating zone and the lower heating zone can be controlled in a zoned mode, and meanwhile, the lower heating can be enhanced, and the phenomenon that a rolled product is black printed due to a furnace bottom cooling water pipe is avoided. The staggered arrangement of the total oxygen flameless burner 4 can lead the heat distribution in the hearth to be more uniform, and avoid the phenomena of over-burning or under-burning of the product locally. The full-oxygen flameless burner 4 is horizontally arranged on the end face of the soaking section 3, so that the soaking section 3 can be complemented with heat, and the phenomenon that the billet heating temperature does not reach the standard due to the fact that the 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 all adopt a multi-layer refractory brick and heat preservation castable composite structure, can withstand high temperature of 1500 ℃ and have good heat preservation performance. The preheating section 1 is provided with an upper inclined plane retaining wall 30 and a lower inclined plane retaining wall 31 at the front and back, the hearth area of the preheating section 1 is reduced by the inclined plane retaining wall, 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 flue gas temperature is reduced, and the heat efficiency of the heating furnace is improved.
As shown in fig. 4, 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 position tracking model realizes the position tracking of the billet in the whole process from the moment of entering the heating furnace to the last tapping. The basic information acquisition model is used for acquiring basic data of a blank to be charged, including a blank number, a blank size, a weight, a steel grade and a heating curve. The steel billet temperature prediction module monitors the real-time furnace temperature information and the steel billet position information provided by the steel billet logistics information module, and the temperature of all steel billets in the heating furnace is calculated through a mathematical model built in the steel 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 time of the steel billet entering the furnace to the time of the steel billet exiting the furnace. The steel billet temperature prediction module can automatically learn, and feedback analysis is carried out on various parameters of steel billets just entering the furnace and various parameters of steel billets just coming out of the furnace after the heating in the furnace is completed, so that the overall accuracy is improved.
As shown in FIG. 5, the intelligent temperature control system adopts an improved double-crossover limiting control mode, a furnace temperature regulating loop is used as a main loop, and fuel flow and oxygen flow are regulated as auxiliary loops. When the load changes, the fuel flow is limited up and down according to the actually measured oxygen flow, and the oxygen flow is limited up and down according to the actually measured fuel flow. Thus, as the load increases or decreases, the fuel flow and the oxygen flow limit each other, alternately increasing or decreasing, so that the system maintains a good air-fuel ratio even in a dynamic situation.
The specific implementation mode is that the furnace temperature regulating loop takes the furnace temperature set value as an input variable, the furnace temperature set value is dynamically corrected by the billet real-time temperature calculated by the billet tracking system and then is used as an input value of the furnace temperature PID regulator, and the input value in the furnace temperature PID regulator and the actual furnace temperature value are subjected to proportional/integral/differential operation to obtain an output value A which is used as the input values 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 LS1. 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 regulator output signal A is compared with signals B and C obtained by multiplying a deviation coefficient K1 and a deviation coefficient K3 by a fuel flow rate calculated from an actually measured oxygen flow rate, 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 regulator. In the oxygen flow regulating loop, the output signal A of the furnace temperature PID regulator is compared with the signals D and E obtained by multiplying the actual measured fuel flow by the deviation signal K2 and the deviation signal K4 respectively, and is selected by a high value selector HS2 and a low value selector LS2, and then multiplied by a flow range correction coefficient, and the corrected air excess coefficient is used as the set value of the oxygen flow regulator. Meanwhile, the oxygen content of the flue gas is used for correcting the oxygen-fuel ratio, so that the optimal oxygen-fuel ratio is ensured. The fuel supply amount of the fuel flow regulating valve and the oxygen supply amount 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 transient stage, when the load is reduced, the oxygen-fuel ratio does not exceed the set upper limit value, and when the load is increased sharply, the oxygen-fuel ratio is not lower than the lower limit value for preventing black smoke. Thereby ensuring that the combustion process can be carried out in the optimal combustion area, and achieving the purposes of saving energy, completely burning and preventing pollution. In the specific implementation process, the following three conditions are described in detail:
Case (a):
when the system is stable, the flow adjustment value is positioned between the lower fuel flow limit B and the upper fuel flow limit C, and the double-crossover system is in an equilibrium state, so that the fuel flow and oxygen flow signals are directly given by A.
Case (b):
When the furnace temperature is high and load reduction is needed, the value A is reduced, for the gas side, A is smaller than B and smaller than C, and the value A is compared with the value B. The A value and the B value are compared by the HS1 high-selection module to output a larger B value, then the B value and the C value are compared by the LS1 low-selection module to output a smaller B value, and finally the B value is used as a flow set value to be output to the gas flow regulating module, and the flow set value is output as a fuel flow lower limit B. Where b=fa×k3, c=fa×k1 (FA is oxygen flow, preferably k3=0.94, k1=1.04).
For the oxygen side, A < E < D, A is first compared with D. The A value and the D value are compared by the LS2 low-selection module to output a smaller A value, then the A value and the E value are compared by the HS2 high-selection module to output a larger E value, and finally the E value is used as a flow set value to be output to the oxygen flow regulation module, and the output is the lower limit E of the oxygen flow. Where d=ff=k4, e=ff=k2 (FF is fuel flow, preferably k4=1.06, k2=0.96).
Case (c):
When the furnace temperature is low and load increase is needed, the value A is increased, and for the gas side, A is more than C and more than B, the value A is compared with the value B. The A value and the B value are compared by the HS1 high value selector to output a larger A value, then the A value and the C value are compared by the LS1 low value selector to output a smaller C value, and finally the C value is used as a flow set value to be output to the gas flow regulating module, and the output is the upper limit C of the fuel flow. Where b=fa×k3, c=fa×k1 (FA is oxygen flow, preferably k3=0.94, k1=1.04).
For the oxygen side, A > D > E, A is first compared with D. The A value and the D value are compared by the LS2 low value selector to output a smaller D value, then the D value and the E value are compared by the HS2 high value selector to output a larger D value, and finally the E value is used as a flow set value to be output to the oxygen flow regulating module, and the output is the upper limit D of the oxygen flow. Where d=ff=k4, e=ff=k2 (FF is fuel flow, preferably k4=1.06, k2=0.96).
Regarding the set values of the gas and oxygen control loops, the deviation coefficients K1, K2, K3 and K4 are selected according to the following principles:
Oxygen increases in advance during temperature rising. At this time, K4 is more than K1, and when the fuel is added, the oxygen adding proportion is more than that of the fuel, so that the fuel can be ensured to be fully combusted without black smoke. The fuel is increased in advance when the temperature is reduced. At this time, K3 is less than K2, and when fuel is reduced, the fuel reduction ratio is more than that of oxygen, so that the safety of the 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 can be completely executed, and the intelligent temperature control and optimal control of the whole process can be realized.
As shown in FIG. 6, the furnace pressure control system adopts a control method of combining conventional proportional-integral control with 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 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 grading of the input values. When the input value is lower than a certain threshold value, steady-state errors exist in the simple fuzzy control, and proportional integral output Deltau is added into the fuzzy control output value u to compensate so as to eliminate the steady-state errors of the fuzzy controller output value. The opening degree of the smoke exhaust valve is dynamically adjusted in a control mode of combining fuzzy control and conventional proportional integral control, so that larger 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 interlocking protection system comprises a power-off protection module, a hearth overtemperature protection module, a fuel gas pressure low protection module and an oxygen pressure low protection module. When any one or more of the conditions of power failure accident, 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 warm-keeping rolling system comprises a planned rolling module and an unintended rolling module. The blank heat-preserving rolling system automatically reduces the fuel consumption when rolling occurs, and rapidly reduces the furnace temperature to a proper low level so as to reduce consumption and avoid overheating and overburning accidents. Before restarting rolling, the billet heat-preserving and rolling system heats the discharged billet to the thermal state required by the process in a short time, and puts the billet into production on time, thereby avoiding influencing the production due to waiting for good burning. Under normal rolling conditions, the heated billet is controlled by a planned waiting rolling module to perform cooling, heat preservation and reheating control during waiting rolling according to planned waiting rolling time. When the rolling mill has abnormal rolling conditions such as electrical faults, roll changing and rolling stopping, and the like, the blank heat-preserving and rolling system executes an unplanned rolling module. Under the condition that the unplanned waiting time is uncertain, the unplanned waiting module executes a very slow cooling process, meanwhile, the unsteady heating calculation is carried out by combining the billet temperature prediction module, and when the production is restarted, the billet is rapidly heated to a discharging state according to accurate billet thermal state data.
The above examples are implemented on the premise of the technical scheme of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the above examples. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (5)
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, a heating section and a soaking section; the heating section and the soaking section are internally divided into an upper heating area and a lower heating area; 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 group; the nitrogen purging system comprises a nitrogen pipeline and a nitrogen valve; the smoke exhaust system comprises a smoke exhaust duct, a smoke exhaust valve and a chimney;
The device is characterized in that the side walls of the upper heating zone and the lower heating zone of the heating section are provided with full-oxygen flameless burners which are layered up and down and staggered left and right;
The side walls of the upper heating zone and the lower heating zone of the soaking section are provided with full-oxygen flameless burners which are arranged in a staggered manner in an up-and-down layering manner; the end wall of the heating area 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 full-oxygen flameless burner at the end face of the soaking section supplements heat for the soaking section, so that the phenomenon that the billet heating temperature does not reach the standard due to the fact that the furnace door is frequently opened to suck cold air is avoided;
The control system comprises a blank tracking system, an intelligent temperature control system, a hearth pressure control system, a chain alarm protection system and a blank heat preservation and rolling system;
an upper inclined retaining wall and a lower inclined retaining wall are arranged in front of and behind the preheating section;
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 position tracking model realizes the position tracking of the billet in the whole process from the moment of entering the heating furnace to the moment of discharging the billet finally; the basic information acquisition model is used for acquiring basic data of a blank to be charged, including a blank number, a blank size, a weight, a steel grade and a heating curve; the steel billet temperature prediction module monitors the real-time furnace temperature information and the steel billet position information provided by the steel billet logistics information module, and calculates the temperature of all steel billets in the heating furnace through a mathematical model built in the steel 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 calculation model; the steel billet temperature prediction is the whole process from the steel billet just entering the furnace to just exiting the furnace; the steel billet temperature prediction module has an automatic learning function, and feedback analysis is carried out on various parameters of steel billets just entering a furnace and various parameters of steel billets just coming out of the furnace after the heating in the furnace is completed, so that the overall accuracy is improved;
The hearth pressure control system adopts a control method of proportional integral control combined with 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 input values of a proportional integral controller and a fuzzy controller, the fuzzy controller firstly divides the input values into five grades, different values fall on different grades, and the fuzzy controller adopts corresponding control strategies through the grading of the input values; when the input value is lower than the threshold value, the steady-state error exists in the simple fuzzy control, and the output Deltau of the proportional integral controller is added into the fuzzy control output value u to compensate so as to eliminate the steady-state error of the fuzzy controller output value; the opening degree of the smoke exhaust valve is dynamically adjusted in a control mode of combining fuzzy control and proportional integral control, so that larger fluctuation of the hearth pressure caused by mechanical operation of the heating furnace is avoided, and stable control of the hearth pressure is realized;
The interlocking alarm protection system comprises a power-off protection module, a hearth overtemperature protection module, a fuel gas pressure low protection module and an oxygen pressure low protection module; when any one or more of the conditions of power failure accident, 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;
the blank heat-preservation rolling system comprises a planned rolling module and an unplanned rolling module; the control of cooling, heat preservation and re-heating of the heating furnace during the rolling process is realized through the blank heat preservation system to be rolled.
2. The oxy-fuel combustion system for a steel rolling heating furnace according to claim 1, wherein furnace walls of the preheating section, the heating section and the soaking section all adopt a multi-layer refractory brick and heat preservation castable composite structure.
3. The oxy-fuel combustion system for the 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 group and an independent oxygen branch pipe valve group, and the heat load of each section of the oxy-fuel heating furnace is regulated and controlled through the fuel branch pipe valve group and the oxygen branch pipe valve group, so that the temperature is controlled in a sectionalized and independent mode;
The intelligent temperature control system controls the fuel quantity and the oxygen quantity entering the full-oxygen burner through the fuel flow regulating valve on the fuel pipe before the nozzle and the oxygen flow regulating valve on the oxygen pipe before the nozzle, and the heat supply quantity of each full-oxygen burner can be independently and accurately controlled, so that the billet is accurately heated according to the billet heating curve, the billet heating quality is ensured, and the fuel is fully combusted.
4. 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 billet real-time temperature obtained by calculation of a 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 values 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 LS1; a high value selector HS2 and a low value selector LS2 are arranged in the oxygen flow regulating loop; in the fuel flow rate regulating circuit, a furnace temperature PID regulator outputs a signal A, and compared with signals B and C obtained by multiplying a deviation coefficient K1 and a deviation coefficient K3 by fuel flow rate calculated according to actual measured oxygen flow rate, the signals are 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 regulator; in the oxygen flow regulating loop, the output signal A of the furnace temperature PID regulator is compared with signals D and E obtained by multiplying the actually measured fuel flow by a deviation signal K2 and a deviation signal K4 respectively, and is selected by a high value selector HS2 and a low value selector LS2, and then multiplied by a flow range correction coefficient, and the corrected air excess coefficient is used as a set value of the oxygen flow regulator; meanwhile, the oxygen content of the flue gas is used for correcting the oxygen-fuel ratio, so that the optimal oxygen-fuel ratio is ensured; controlling the fuel supply amount of the fuel flow regulating valve and the oxygen supply amount of the oxygen flow regulating valve through 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 increased sharply, the oxygen-fuel ratio is not lower than the lower limit value for preventing black smoke from being emitted; thereby ensuring that the combustion process can be carried out in the optimal combustion area, and achieving the purposes of saving energy, completely burning and preventing pollution.
5. The oxy-fuel combustion system for a steel rolling heating furnace according to claim 4, 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 fuel flow limit B and the upper fuel flow limit C, and the double-crossover system is in a balanced state, so that fuel flow and oxygen flow signals are directly given out by the output signal A of the furnace temperature PID regulator;
case (b):
When the furnace temperature is high and load reduction is needed, the value A is reduced, for the gas side, A is smaller than B and smaller than C, and the value A is compared with the value B; the A value and the B value are compared by the HS1 high-selection module to output a larger B value, then the B value and the C value are compared by the LS1 low-selection module to output a smaller B value, and finally the B value is used as a flow set value to be output to the gas flow regulating module, and is output as a lower limit B of the fuel flow at the moment; wherein b=fa×k3, c=fa×k1, FA is oxygen flow;
For the oxygen side, A is less than E and less than D, A is firstly compared with D; the A value and the D value are compared by the LS2 low-selection module to output a smaller A value, then the A value and the E value are compared by the HS2 high-selection module to output a larger E value, and finally the E value is used as a flow set value to be output to the oxygen flow regulation module, and the E value is output as an oxygen flow lower limit E at the moment; wherein d=ff×k4, e=ff×k2, FF is the fuel flow rate;
Case (c):
When the furnace temperature is low and load increase is needed, the value A is increased, and for the gas side, A is more than C and more than B, the value A is compared with the value B; the A value and the B value are compared by the HS1 high value selector to output a larger A value, then the A value and the C value are compared by the LS1 low value selector to output a smaller C value, and finally the C value is used as a flow set value to be output to the gas flow regulating module, and is output as the upper limit C of the fuel flow at the moment; wherein b=fa×k3, c=fa×k1; FA is oxygen flow;
For the oxygen side, A > D > E, A is compared with D first; the A value and the D value are compared by an LS2 low value selector to output a smaller D value, then the D value and the E value are compared by an HS2 high value selector to output a larger D value, and finally the E value is used as a flow set value to be output to an oxygen flow regulating module, and the output is an oxygen flow upper limit D; where d=ff×k4, e=ff×k2, FF is the fuel flow rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210358884.2A CN114688868B (en) | 2022-04-07 | 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 | 2022-04-07 | Total oxygen combustion system for steel rolling heating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114688868A CN114688868A (en) | 2022-07-01 |
| CN114688868B true CN114688868B (en) | 2024-05-31 |
Family
ID=82142490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210358884.2A Active CN114688868B (en) | 2022-04-07 | 2022-04-07 | Total oxygen combustion system for steel rolling heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114688868B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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 |
-
2022
- 2022-04-07 CN CN202210358884.2A patent/CN114688868B/en active Active
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,2008,第315-316页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114688868A (en) | 2022-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110793032B (en) | Oxygen-enriched combustion system of heating furnace and control method thereof | |
| CN101561224A (en) | Method for controlling combustion atmosphere in large-scale walking beam type plate blank heating furnace | |
| CN101876449A (en) | Method of controlling oxygen air-flowing environment in heating furnace | |
| CN114688868B (en) | Total oxygen combustion system for steel rolling heating furnace | |
| 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 | |
| CN203112858U (en) | Bleeding oxygen reutilization device in metallurgical production | |
| WO2019042155A1 (en) | Plasma heating-based temperature regulation method and device for blast furnace hot air system | |
| CN112239797A (en) | Large blast furnace top combustion type hot blast furnace vault temperature control technology | |
| CN211177906U (en) | Double-flame heating and smoke-discharging adjustable trolley type heating furnace | |
| CN218723229U (en) | Combined combustion system of total oxygen heating furnace | |
| CN102381830B (en) | A kind of method and system of supporting combustion by using oxygen-enriched air in production of float glass | |
| CN214655158U (en) | Rotary hearth furnace system for preparing metallized pellets based on oxygen-enriched combustion | |
| CN215572140U (en) | Low NOx combustion device of belt type roasting machine | |
| CN109579044B (en) | Air-fuel ratio dynamic feedforward combustion control method for walking beam furnace | |
| CN111707096A (en) | Secondary aluminum smelting total oxygen combustion device and smelting method | |
| CN103451335B (en) | Method for heating special steel with low-heat-value blast furnace coal gas | |
| CN110763011A (en) | Double-flame heating and smoke exhaust adjustable trolley type heating furnace and heating temperature control method | |
| CN114908203B (en) | Method, device and application for electrically heating reducing gas | |
| CN110713353A (en) | Lime sleeve kiln control process capable of effectively improving combustion efficiency of kiln | |
| CN220981355U (en) | Kiln waste gas treatment device | |
| CN220532964U (en) | Energy-saving baking system suitable for large steel ladle with size of more than 250t | |
| CN220867461U (en) | Low-gas-consumption gas baking system of iron-mixing furnace | |
| CN219713358U (en) | Flue gas external circulation nitrogen reduction system | |
| CN211712939U (en) | Fire-resistant glass kiln capable of adjusting working environment |
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 | ||
| GR01 | Patent grant |