CN108118145B - Gas injection device and gas injection method thereof - Google Patents
Gas injection device and gas injection method thereof Download PDFInfo
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- CN108118145B CN108118145B CN201711178738.7A CN201711178738A CN108118145B CN 108118145 B CN108118145 B CN 108118145B CN 201711178738 A CN201711178738 A CN 201711178738A CN 108118145 B CN108118145 B CN 108118145B
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- pull rod
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- 238000002347 injection Methods 0.000 title claims abstract description 302
- 239000007924 injection Substances 0.000 title claims abstract description 302
- 238000000034 method Methods 0.000 title claims description 60
- 239000007789 gas Substances 0.000 claims abstract description 346
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 280
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 137
- 238000007664 blowing Methods 0.000 claims abstract description 77
- 239000002737 fuel gas Substances 0.000 claims abstract description 57
- 238000005245 sintering Methods 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims description 42
- 238000010926 purge Methods 0.000 claims description 22
- 230000001360 synchronised effect Effects 0.000 claims description 22
- 238000012544 monitoring process Methods 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims 16
- 238000004519 manufacturing process Methods 0.000 description 16
- 239000000446 fuel Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 10
- 238000009826 distribution Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 229910001873 dinitrogen Inorganic materials 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012256 powdered iron Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The gas jetting device comprises a sintering machine trolley, a jetting cover and a gas jetting device. The fuel gas injection device comprises a fuel gas injection main pipe, a fuel gas injection branch pipe and a fuel gas injection pipe row. The sintering machine trolley is positioned in the blowing cover. The fuel gas injection header pipe is disposed outside the injection hood. The gas injection tube row is arranged above the sintering pallet, and the gas injection tube row is positioned in the injection cover. One end of the fuel gas injection branch pipe is connected with the fuel gas injection main pipe, and the other end is connected with the fuel gas injection pipe row. The device also comprises a nitrogen pipeline arranged at one side of the gas injection main pipe, and the nitrogen pipeline is connected with the gas injection main pipe through a connecting pipe. The invention can accurately judge whether the fire happens in the blowing cover and timely and quickly eliminate the fire situation.
Description
Technical Field
The invention relates to a gas blowing device of a sintering machine and a gas blowing method thereof, in particular to a gas blowing device for quick detection and self-adaptive treatment of ignition in a blowing cover and a method thereof, belonging to the field of sintering.
Background
The sintering process is one key link in iron making process, and is characterized by that various powdered iron-containing raw materials are mixed with proper quantity of fuel and flux, and added with proper quantity of water, and after mixing and pelletizing, the materials are undergone the processes of a series of physical-chemical change on sintering equipment, and sintered into blocks, so that they are fed into blast furnace to implement next process.
In order to reduce the coke ratio and smelting cost of blast furnace ironmaking, the requirements of blast furnace on sinter are often high strength and high reducibility. In the sintering process, sintered ore is generally required to have high strength, high yield, low return rate, and low fuel consumption. The high-strength and high-reducibility sintered ore consumes less coke in the blast furnace smelting process, thereby reducing the emission of carbon dioxide. In the long term, carbon dioxide emission reduction requirement becomes one of the bottlenecks restricting the development of the steel industry. According to the related data, the carbon dioxide emission of the sintering and blast furnace process accounts for about 60% of the total industrial emission. Therefore, reduction of the sintered solid fuel consumption ratio and reduction of the fuel ratio of the blast furnace burden are urgent needs of iron-making technology, both from the viewpoint of cost reduction of enterprises and from the viewpoint of environmental protection.
In such a large environment, the "technology for injecting gas fuel into a sinter level" developed by JFE corporation in japan has been developed, which is based on the principle that gas fuel diluted below the lower limit of the combustible concentration is injected above the sinter level a certain distance after the ignition furnace, so that the gas fuel is burned in the sinter layer to supply heat, thereby reducing the solid carbon consumption and CO in the production of sinter 2 Discharge ofAmount of the components. Meanwhile, the burning of the gas fuel widens the width of a high-temperature zone of the sinter layer during production, so that the temperature time of the sinter at 1200-1400 ℃ is prolonged, and the strength and the 5-10 mm porosity of the sinter are effectively enhanced. At present, the technology has better energy-saving, emission-reducing and quality-improving effects.
Blowing device structure under the prior art: the blowing device consists of a blowing main pipe, a blowing branch pipe, a blowing pipe row, a fuel gas blowing hole, a blowing cover and a side sealing piece. One end of the blowing main pipe is connected with the gas pipeline in the factory, and the other end of the blowing main pipe is connected with the blowing pipe row through the blowing branch pipe, and the blowing pipe row is positioned in the blowing cover and above the sintering machine trolley. When the gas is produced, the gas enters the injection manifold from the gas pipeline in the factory and then enters the injection branch pipe, finally enters the injection pipe row and is sprayed out through the gas injection holes arranged on the pipe row, the gas is mixed and diluted with air in the injection cover to form mixed gas with the concentration required by design, the mixed gas enters the sintering material layer to assist sintering, and the side sealing piece can effectively ensure that the gas and the mixed gas in the cover can not overflow out of the cover.
In the gas injection production, the gas sprayed above the material surface is ignited due to the reasons of poor material layer air permeability, overhigh material surface temperature, large cracks on the material surface and the like, and the gas injection technology under the traditional prior art can not quickly detect the gas ignition condition possibly occurring at any time in production and can not perform self-adaptive control treatment on ignition, so the following problems are caused:
1. The energy waste is serious: when the fuel gas burns on the material surface, once the quick detection and control treatment cannot be performed, a large amount of fuel gas is consumed by flame, and meanwhile, the fuel gas cannot normally enter the material layer internal reference and auxiliary sintering process, so that a large amount of fuel resources are wasted in production, and the energy waste is not allowed under the large trend that the national 'energy conservation and emission reduction' has become the strategic direction;
2. the service life of the equipment is shortened: when the combustion of the fuel gas is not detected and controlled at the material surface and is combusted for a long time, the blowing pipe row is easy to deform and bend under the long-term baking of the flame, so that the production operation capability is lost, the service life of the blowing device is shortened, the operation rate is lowered, the operation cost of the device is greatly increased, and the economical efficiency is lowered;
3. there is a potential safety hazard: under the prior art, when an operator finds that the gas in the cover catches fire, the operator needs to remotely close the gas main pipe valve in the central control room, and then go to the site to manually open the nitrogen valve to purge the gas in the gas main pipe; a certain time difference exists between the closing of the gas valve and the opening of the nitrogen valve, and the time difference can even reach 20-30 minutes when the field personnel are short; after the fuel gas is cut off, flame can burn in the fuel gas pipe along the flow direction of the fuel gas to form backfire, so that potential safety hazards such as explosion and the like are caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention optimizes and improves the structure of the prior blowing device, and aims to develop a method capable of rapidly judging the fire condition in the cover according to the change condition of the temperature curve in the cover and carrying out self-adaptive fire extinguishing treatment, and simultaneously develops a corresponding device to compensate the leak of the prior art so as to achieve the purposes of stable production and smooth production of the whole gas blowing auxiliary sintering production process line. According to the gas injection device, the temperature above the gas injection tube row in the injection cover is monitored in real time, whether ignition occurs in the injection cover is accurately judged, and the ignition condition can be timely and quickly eliminated.
According to a first embodiment of the present invention, there is provided a gas injection apparatus:
the gas jetting device comprises a sintering machine trolley, a jetting cover and a gas jetting device. The fuel gas injection device comprises a fuel gas injection main pipe, a fuel gas injection branch pipe and a fuel gas injection pipe row. The sintering machine trolley is positioned in the blowing cover. The fuel gas injection header pipe is disposed outside the injection hood. The gas injection tube row is arranged above the sintering pallet, and the gas injection tube row is positioned in the injection cover. One end of the fuel gas injection branch pipe is connected with the fuel gas injection main pipe, and the other end is connected with the fuel gas injection pipe row. The device also comprises a nitrogen pipeline arranged at one side of the gas injection header pipe. The nitrogen pipeline is connected with the gas injection main pipe through a connecting pipe.
In the invention, the device further comprises a temperature detection device arranged at the side part of the blowing cover. The temperature detection device stretches into the injection cover and is positioned above the fuel gas injection tube row.
Preferably, the connecting pipe is provided with a nitrogen valve.
Preferably, the gas injection header pipe is provided with a gas valve. The gas valve is arranged at the upstream of the connection position of the connecting pipe and the gas injection main pipe.
In the invention, the device also comprises a synchronous control device which is connected with and controls the nitrogen valve and the gas valve. Preferably, the synchronous control device is a synchronous control pull rod device. The synchronous control pull rod device comprises a gas split pull rod, a nitrogen split pull rod, a connecting cross rod, a main pull rod and a driving device. Wherein the gas separating pull rod is connected with the gas valve. The nitrogen dividing pull rod is connected with a nitrogen valve. One end of the main pull rod is connected with the gas branch pull rod and the nitrogen branch pull rod respectively through the connecting cross rod, and the other end of the main pull rod is connected with the driving device.
In the invention, the driving device is a driving motor or a cylinder driving device.
Preferably, the cylinder driving apparatus includes a cylinder, a piston plate, a front chamber air inlet pipe, a front chamber solenoid valve, a rear chamber air inlet pipe, and a rear chamber solenoid valve. Wherein the piston plate is located inside the cylinder, dividing the cylinder interior into front and rear chambers. The front chamber air inlet pipe is connected and communicated with the front chamber of the cylinder. The front chamber electromagnetic valve is connected with the front chamber air inlet pipe. The rear chamber air inlet pipe is connected and communicated with the rear chamber of the cylinder. The back chamber electromagnetic valve is connected with the back chamber air inlet pipe. The piston plate is connected with one end of the total pull rod.
Preferably, the piston plate is horizontally arranged inside the cylinder, and the total pull rod is vertically connected with the piston plate.
Preferably, the distance between the end of the temperature detection device extending into the blowing cover and the gas blowing pipe row is 50-300mm, preferably 100-200mm. Preferably, the temperature detection device is a thermocouple temperature sensor.
Preferably, the length of the end of the temperature detecting means extending into the blowing hood is 10-200mm, preferably 50-150mm, more preferably 80-100m. That is, the temperature sensing device passes through the blowing hood and one end of the temperature sensing device is located within the blowing hood.
Preferably, the gas injection header pipe is provided with 1-10 gas injection branch pipes, preferably 2-8 gas injection branch pipes.
Preferably, 2-50 gas injection pipes, preferably 3-20 gas injection pipes, are arranged on each gas injection pipe row. Preferably, 2 to 100 gas injection holes, preferably 3 to 50 gas injection holes, are provided in each gas injection pipe.
In the invention, the gas injection pipe is a gas injection sleeve with 2 or more sections. The fuel gas injection sleeve adopts a telescopic sleeve structure. Preferably, each section of the gas injection sleeve is provided with a gas injection hole.
In the present invention, the apparatus further comprises a control system. The control system is connected with the temperature detection device, the driving motor, the front-chamber electromagnetic valve and the rear-chamber electromagnetic valve and controls the operation of the driving motor, the front-chamber electromagnetic valve and the rear-chamber electromagnetic valve.
According to a second embodiment of the present invention, there is provided a gas injection method:
a gas injection method, the method comprising the steps of:
1) The device starts to operate, the gas injection device starts to inject gas, and the control system monitors a temperature value T above a gas injection pipe row in the injection cover in real time through the temperature detection device;
2) In the real-time monitoring process, if the temperature value T has peak temperature T 1 The control system starts timing when the peak temperature T 1 Duration t of (2) 1 After the time t is exceeded in the system, the control system judges that the fire in the blowing cover occurs at the moment;
3) The control system controls the driving motor to rotate positively, and the driving motor applies thrust to the gas distribution pull rod and the nitrogen distribution pull rod respectively through the total pull rod, so that the gas valve and the nitrogen valve are driven to rotate, and the gas valve is closed and the nitrogen valve is opened at the same time;
4) When the temperature detection device detects the gas injection tube row in the injection coverAfter the temperature value T above falls back to the normal value, or the control system starts timing after the nitrogen valve is opened, when the opening time of the nitrogen valve reaches the default nitrogen purging time T of the system 2 Afterwards; the control system judges that the fire in the blowing cover is extinguished at the moment;
5) The control system controls the driving motor to rotate reversely, the driving motor applies pulling force to the gas distribution pull rod and the nitrogen distribution pull rod through the total pull rod respectively, so that the gas valve and the nitrogen valve are driven to rotate, the gas valve is opened, the nitrogen valve is closed, and the device continues to produce.
Preferably, in the above method, the system internal setting time t is 10 to 30s, preferably 12 to 25s, more preferably 15 to 20s.
Preferably, in the above method, the system defaults to a nitrogen purge time t 2 15 to 60s, preferably 20 to 40s.
According to a third embodiment of the present invention, there is provided a gas injection method:
a gas injection method, the method comprising the steps of:
1) The device starts to operate, the gas injection device starts to inject gas, and the control system monitors a temperature value T above a gas injection pipe row in the injection cover in real time through the temperature detection device;
2) In the real-time monitoring process, if the temperature value T has peak temperature T 1 The control system starts timing when the peak temperature T 1 Duration t of (2) 1 After the time t is exceeded in the system, the control system judges that the fire in the blowing cover occurs at the moment;
3) The control system controls the front chamber electromagnetic valve and the rear chamber electromagnetic valve of the cylinder driving device to respectively exhaust and intake air in the front chamber and the rear chamber of the cylinder, drives the piston plate to move upwards, and further drives the total pull rod to respectively apply thrust to the gas split pull rod and the nitrogen split pull rod, so that the gas valve and the nitrogen valve are driven to rotate, and the gas valve is closed and the nitrogen valve is opened at the same time;
4) When the temperature detection device detects that the temperature value T above the gas injection tube row in the injection cover falls back to a normal value, or the control system is arranged on the nitrogen valveStarting timing after the door is opened, and when the opening time of the nitrogen valve reaches the default nitrogen purging time t of the system 2 Afterwards; the control system judges that the fire in the blowing cover is extinguished at the moment;
5) The control system controls the front chamber electromagnetic valve and the rear chamber electromagnetic valve of the cylinder driving device to respectively perform air inlet and air exhaust operation on the front chamber and the rear chamber of the cylinder, drives the piston plate to move downwards, and further drives the total pull rod to respectively apply pull force to the gas split pull rod and the nitrogen split pull rod, so that the gas valve and the nitrogen valve are driven to rotate, the nitrogen valve is closed while the gas valve is opened, and the device continues to produce.
Preferably, in the above method, the system internal setting time t is 10 to 30s, preferably 12 to 25s, more preferably 15 to 20s.
Preferably, in the above method, the system defaults to a nitrogen purge time t 2 15 to 60s, preferably 20 to 40s.
In the present invention, the temperature detecting means is provided at the side of the blowing hood. The number of the temperature detecting devices may be one or more, and when the number is plural, the temperature detecting devices may be disposed at intervals on the side portions of both sides of the blowing cover along the traveling direction of the sintering pallet. The temperature detection device (the temperature measurement probe) stretches into the blowing cover and is positioned at a height position of 50-300mm, preferably 100-200mm, above the gas blowing pipe row, so that temperature data in the blowing cover can be monitored in real time.
In the invention, the gas valve is arranged at the upstream of the connection position of the connecting pipe and the gas injection main pipe. The upstream concept here is that the gas valve is passed before the connection point of the connection pipe with the gas injection manifold, with respect to the gas flow direction, i.e. when the gas is injected by the gas injection device. The arrangement ensures the independent control function of the gas valve and the nitrogen valve.
The synchronous control pull rod device (for gas and nitrogen) comprises a gas split pull rod, a nitrogen split pull rod, a connecting cross rod, a total pull rod and a driving device. The gas distribution pull rod is tightly connected with the handle of the gas valve on the gas injection main pipe, and the nitrogen distribution pull rod is tightly connected with the handle of the nitrogen valve on the connecting pipe. The driving device may be one of various structures capable of providing driving force, such as a driving motor or a cylinder driving device. When the driving device is a driving motor, the main pull rod is pushed or pulled by controlling the forward rotation or the reverse rotation of the driving motor, so that the gas distribution pull rod and the nitrogen distribution pull rod (connected with the two ends of the cross rod) are driven to act simultaneously, and the effect of opening (or closing) the nitrogen valve while closing (or opening) the gas valve is realized.
When the driving device is a cylinder driving device, the piston plate is horizontally arranged in the cylinder, the cylinder is internally divided into a front chamber and a rear chamber, namely the front chamber is positioned at the upper part of the cylinder, and the rear chamber is positioned at the lower part of the cylinder, namely the front chamber is positioned at the upper part of the rear chamber. And the piston plate is connected with one end of the total pull rod. When the cylinder driving device controls the air exhaust of the front chamber of the cylinder and the air intake of the rear chamber of the cylinder through the front chamber electromagnetic valve and the rear chamber electromagnetic valve, the piston plate is driven to move upwards, so that the total pull rod is driven to respectively apply thrust to the gas split pull rod and the nitrogen split pull rod (which are connected with the two ends of the cross rod), and the handles of the gas valve and the nitrogen valve are driven to rotate, so that the gas valve is closed and the nitrogen valve is opened at the same time; when the cylinder driving device controls the air inlet of the front chamber of the cylinder and the air exhaust of the rear chamber of the cylinder through the front chamber electromagnetic valve and the rear chamber electromagnetic valve, the piston plate is driven to move downwards, and then the total pull rod is driven to apply pull force to the gas split pull rod and the nitrogen split pull rod (which are connected with the two ends of the cross rod) respectively, so that the handles of the gas valve and the nitrogen valve are driven to rotate, and the nitrogen valve is closed when the gas valve is opened. The setting of the pull rod device is synchronously controlled by the fuel gas and the nitrogen, so that the fuel gas is cut off and the nitrogen purging is synchronously carried out under the condition of fire in the injection cover, the time difference between the fuel gas and the nitrogen purging is basically avoided, and the tempering of the fuel gas in the pipeline caused by the time difference can be controlled to the greatest extent.
The invention provides a method for rapidly judging the ignition condition according to a curve of temperature change along with time in a blowing cover, which comprises the following steps:
the inside of the lower blowing cover is in a cold state in normal production, and the temperature above the gas blowing pipe row is a stable straight line, namely, the ambient temperature is maintained unchanged; when the local high-temperature points such as rat holes, large cracks and the like on the surface of the sintered material pass through the injection cover, the fuel gas is injectedThe temperature above the blowing pipe row has short-time peak fluctuation, and when a high-temperature point passes, the temperature curve returns to normal; when the gas in the injection cover catches fire, the temperature above the gas injection pipe row rises to the peak temperature in a straight line and is kept not to drop near the peak temperature. Thus, the present invention proposes two conditions for judging fire in the blowing hood: peak temperature and peak temperature duration occur. Only if both of these meet the requirements can the party be considered as a fire in the hood. That is, only the temperature detecting device detects the peak temperature T of the temperature value T in the real-time monitoring process 1 And peak temperature T 1 Duration t of (2) 1 After the system set time t (i.e., the peak temperature duration of the fire criteria has been reached) is exceeded, the control system determines that a fire has occurred in the hood. The system internal setting time t is set according to production experience and on-site production conditions. In general, the time t for the system is set to 10 to 30s, preferably 12 to 25s, and more preferably 15 to 20s.
In general, peak temperature T 1 Different types of fuel gas. Corresponding peak temperatures T of several kinds of fuel gas 1 See table 1.
TABLE 1 peak temperatures T for several gases 1
| Gas type | Coke oven gas | Blast furnace gas | Converter gas | Natural gas |
| Peak temperature T 1 /℃ | 400 | 300 | 350 | 500 |
In addition, after nitrogen purging, the control system may have two modes of operation in determining whether the fire has been extinguished within the injection hood. One is to judge according to the temperature condition in the blowing hood: when the temperature above the gas injection tube row in the injection hood falls back from the peak temperature to the normal value, the control system can judge that the fire in the injection hood is extinguished. The other is judged according to the nitrogen purging duration: the control system begins timing after the nitrogen valve is opened, and the default nitrogen purge duration reaches t 2 All the tube rows in the rear blowing hood are extinguished, and the conditions for continuous production are provided. Typically, the system defaults to a nitrogen purge time t 2 15 to 60s, preferably 20 to 40s.
Compared with the prior art, the invention has the following beneficial effects:
1. the energy is effectively saved: because the technology adopts a mode of monitoring in advance, the first time of ignition of the gas in the injection cover can be found by the system, and the self-adaptive operation of complete set of gas stopping and fire extinguishing-gas introducing production is carried out through a specific device, the whole set of operation is quick and accurate, and the energy waste formed by the combustion of the gas in the injection cover is effectively avoided;
2. Prolonging the service life of equipment: after the device and the method are adopted, because the ignition in the injection cover can be controlled and treated for the first time, the problems of shortened service life caused by long-time baking at high temperature of equipment such as a gas injection pipe row and the like can be avoided;
3. the safety coefficient is improved: because the invention uses the specific device, the nitrogen valve and the gas valve act simultaneously, the gas tempering phenomenon caused by long-time no nitrogen purging after the gas valve is closed is effectively avoided, and the production safety coefficient is improved.
In summary, by using the technology of the invention, the corresponding defects in the prior art can be effectively overcome, and the adaptability and the degree of freedom of the device are improved. Compared with the prior art, the method is more reliable, safer and more stable, and can be expected to have great development potential in future markets.
Drawings
FIG. 1 is a graph of temperature in a blowing hood over time under normal conditions;
FIG. 2 is a graph of temperature in the blowing hood over time under short periods of abnormal conditions;
FIG. 3 is a graph of temperature in the injection hood over time under abnormal conditions;
FIG. 4 is a top view of the fuel gas injection apparatus of the present invention;
FIG. 5 is a cross-sectional view taken at position A-A of FIG. 4;
FIG. 6 is a cross-sectional view of the B-B position of FIG. 4;
FIG. 7 is a schematic diagram of a design of a synchronous control linkage of the present invention;
FIG. 8 is an enlarged view of position C of FIG. 7;
FIG. 9 is a schematic view of a 3-section fuel injection sleeve for a fuel injection pipe according to the present invention;
FIG. 10 is a schematic diagram of a control system according to the present invention;
FIG. 11 is a flow chart of a gas injection method of the present invention;
FIG. 12 is a flow chart of another fuel gas injection method of the present invention;
FIG. 13 is a flow chart of a third gas injection method of the present invention;
fig. 14 is a flowchart of a fourth gas injection method of the present invention.
Reference numerals: 1: sintering machine trolley; 2: a blowing cover; 3: a fuel gas injection device; 301: a fuel gas injection header pipe; 302: a fuel gas injection branch pipe; 303: a gas injection tube row; 304: a gas injection pipe; 305: a fuel gas injection hole; 306: (multi-section telescopic) gas injection sleeve; 4: a temperature detecting device; 5: a nitrogen gas pipe; 6: a connecting pipe; 7: a nitrogen valve; 8: a gas valve; 9: synchronous control pull rod device; 901: a gas split pull rod; 902: nitrogen gas divides the pull rod; 903: connecting the cross bars; 904: a total pull rod; 905: a driving motor; 906: a cylinder driving device; 90601: a cylinder; 90602: a piston plate; 90603: a front chamber air inlet pipe; 90604: a front chamber solenoid valve; 90605: a rear chamber air inlet pipe; 90606: a rear chamber solenoid valve; 10: and a control system.
Detailed Description
According to a first embodiment of the present invention, there is provided a gas injection apparatus:
a gas injection device comprises a sintering pallet 1, an injection cover 2 and a gas injection device 3. The gas injection device 3 includes a gas injection header 301, a gas injection branch 302, and a gas injection tube row 303. The sintering pallet 1 is located in the blowing hood 2. The fuel gas injection manifold 301 is disposed outside the injection hood 2. The gas injection tube row 303 is disposed above the sintering pallet 1, and the gas injection tube row 303 is located in the injection hood 2. The fuel gas injection branch pipe 302 has one end connected to the fuel gas injection header 301 and the other end connected to the fuel gas injection pipe row 303. The apparatus further comprises a nitrogen pipe 5 arranged on one side of the gas injection manifold 301. The nitrogen pipe 5 is connected to the gas injection header 301 through a connection pipe 6.
In the present invention, the device further comprises a temperature detecting means 4 provided at the side of the blowing hood 2. The temperature detecting device 4 extends into the injection cover 2 and is located above the gas injection tube row 303.
Preferably, the connecting pipe 6 is provided with a nitrogen valve 7.
Preferably, the gas injection header 301 is provided with a gas valve 8. The gas valve 8 is disposed upstream of the connection point of the connection pipe 6 and the gas injection header 301.
In the invention, the device also comprises a synchronous control device which is connected with and controls the nitrogen valve 7 and the gas valve 8. Preferably, the synchronous control device is a synchronous control drawbar device 9. The synchronous control pull rod device 9 comprises a gas split pull rod 901, a nitrogen split pull rod 902, a connecting cross rod 903, a total pull rod 904 and a driving device. Wherein the gas split pull rod 901 is connected with the gas valve 8. The nitrogen gas dividing pull rod 902 is connected with the nitrogen gas valve 7. One end of the total tie rod 904 is connected with the gas partial tie rod 901 and the nitrogen partial tie rod 902 through the connecting cross rod 903, respectively, and the other end of the total tie rod 904 is connected with the driving device.
In the present invention, the driving means is a driving motor 905 or a cylinder driving means 906.
Preferably, the cylinder driving apparatus 906 includes a cylinder 90601, a piston plate 90602, a front chamber intake pipe 90603, a front chamber solenoid valve 90604, a rear chamber intake pipe 90605, and a rear chamber solenoid valve 90606. Wherein the piston plate 90602 is positioned inside the cylinder 90601, dividing the interior of the cylinder 90601 into front and rear chambers. The front chamber intake pipe 90603 is connected to and communicates with the front chamber of the cylinder 90601. The front chamber solenoid valve 90604 is connected to a front chamber intake pipe 90603. The rear chamber intake pipe 90605 is connected to and communicates with the rear chamber of the cylinder 90601. The rear chamber solenoid valve 90606 is connected to a rear chamber intake pipe 90605. And the piston plate 90602 is connected to one end of the master rod 904.
Preferably, the piston plate 90602 is disposed horizontally within the cylinder 90601 and the master rod 904 is connected vertically to the piston plate 90602.
Preferably, the distance between the end of the temperature detecting device 4 extending into the blowing hood 2 and the gas blowing tube row 303 is 50-300mm, preferably 100-200mm. Preferably, the temperature detection device 4 is a thermocouple temperature sensor.
Preferably, the length of the end of the temperature detecting means 4 extending into the blowing hood 2 is 10-200mm, preferably 50-150mm, more preferably 80-100m.
Preferably, the gas injection header 301 is provided with 1 to 10 gas injection branch pipes 302, preferably 2 to 8 gas injection branch pipes 302.
Preferably, 2 to 50 gas injection pipes 304, preferably 3 to 20 gas injection pipes 304, are provided on each gas injection pipe row 303. Preferably, 2 to 100 gas injection holes 305, preferably 3 to 50 gas injection holes 305, are provided in each gas injection pipe 304.
In the present invention, the gas injection pipe 304 is a gas injection sleeve 306 of 2 or more. The fuel injection sleeve 306 is of a telescoping sleeve construction. Preferably, each section of the gas injection sleeve 306 is provided with a gas injection hole 305.
In the present invention, the apparatus further comprises a control system 10. The control system 10 is connected to the temperature detecting device 4, the drive motor 905, the front-chamber solenoid valve 90604, and the rear-chamber solenoid valve 90606, and controls the operations of the drive motor 905, the front-chamber solenoid valve 90604, and the rear-chamber solenoid valve 90606.
Example 1
As shown in fig. 5, a gas injection device includes a sintering pallet 1, an injection cover 2, and a gas injection device 3. The gas injection device 3 includes a gas injection header 301, a gas injection branch 302, and a gas injection tube row 303. The sintering pallet 1 is located in the blowing hood 2. The fuel gas injection manifold 301 is disposed outside the injection hood 2. The gas injection tube row 303 is disposed above the sintering pallet 1, and the gas injection tube row 303 is located in the injection hood 2. The fuel gas injection branch pipe 302 has one end connected to the fuel gas injection header 301 and the other end connected to the fuel gas injection pipe row 303. The gas injection tube row 303 includes a plurality of gas injection tubes 304, and gas injection holes 305 are provided in the gas injection tubes 304. The device further comprises temperature detection means 4 arranged at the side of the blowing hood 2. The temperature detecting device 4 extends into the injection cover 2 and is located above the gas injection tube row 303. The distance between the end of the temperature detection device 4 extending into the blowing cover 2 and the gas blowing pipe row 303 is 100mm. The temperature detection device 4 is a thermocouple temperature sensor. The length of the end of the temperature detecting device 4 extending into the blowing hood 2 is 80mm.
As shown in fig. 4 and 6, the apparatus further comprises a nitrogen pipe 5 disposed above the gas injection manifold 301. The nitrogen pipe 5 is connected to the gas injection header 301 through a connection pipe 6. The connecting pipe 6 is provided with a nitrogen valve 7. The gas injection header 301 is provided with a gas valve 8. The gas valve 8 is disposed upstream of the connection point of the connection pipe 6 and the gas injection header 301. The device also comprises a synchronous control device which is a synchronous control pull rod device 9. The synchronous control pull rod device 9 comprises a gas split pull rod 901, a nitrogen split pull rod 902, a connecting cross rod 903, a total pull rod 904 and a driving device. Wherein the gas split pull rod 901 is connected with the gas valve 8. The nitrogen gas dividing pull rod 902 is connected with the nitrogen gas valve 7. One end of the total tie rod 904 is connected with the gas partial tie rod 901 and the nitrogen partial tie rod 902 through the connecting cross rod 903, respectively, and the other end of the total tie rod 904 is connected with the driving device. The driving device is a driving motor 905.
As shown in fig. 9, the gas injection pipe 304 is a 3-joint gas injection sleeve 306. The fuel injection sleeve 306 is of a telescoping sleeve construction. Each section of the fuel injection sleeve 306 is provided with a fuel injection hole 305.
The gas injection header 301 is provided with 3 gas injection branch pipes 302. Each gas injection tube row 303 is provided with 8 gas injection tubes 304. Each gas injection pipe 304 is provided with 5 gas injection holes 305.
The apparatus further comprises a control system 10. The control system 10 is connected to the temperature detecting device 4, the driving motor 905, and controls the operation of the driving motor 905.
Example 2
As shown in fig. 7 and 8, embodiment 1 is repeated except that the driving means is a cylinder driving means 906. The cylinder driving apparatus 906 includes a cylinder 90601, a piston plate 90602, a front chamber air intake pipe 90603, a front chamber solenoid valve 90604, a rear chamber air intake pipe 90605, and a rear chamber solenoid valve 90606. Wherein the piston plate 90602 is positioned inside the cylinder 90601, dividing the interior of the cylinder 90601 into front and rear chambers. The front chamber intake pipe 90603 is connected to and communicates with the front chamber of the cylinder 90601. The front chamber solenoid valve 90604 is connected to a front chamber intake pipe 90603. The rear chamber intake pipe 90605 is connected to and communicates with the rear chamber of the cylinder 90601. The rear chamber solenoid valve 90606 is connected to a rear chamber intake pipe 90605. The piston plate 90602 is connected to one end of the master rod 904. The piston plate 90602 is disposed horizontally inside the cylinder 90601 and the master rod 904 is connected vertically to the piston plate 90602.
The control system 10 is connected to the temperature detecting device 4, the front chamber solenoid valve 90604, and the rear chamber solenoid valve 90606, and controls the operations of the front chamber solenoid valve 90604 and the rear chamber solenoid valve 90606.
Example 3
Example 2 was repeated except that the end of the temperature detecting device 4 extending into the blowing hood 2 was spaced 200mm from the gas injection tube row 303. The length of the end of the temperature detecting device 4 extending into the blowing hood 2 is 40mm.
Example 4
A gas injection method using the apparatus of example 1, comprising the steps of:
1) The device starts to operate, the gas injection device 3 starts to inject gas, and the control system 10 monitors the temperature value T above the gas injection tube row 303 in the injection cover 2 in real time through the temperature detection device 4;
2) In the real-time monitoring process, if the temperature value T has peak temperature T 1 The control system 10 begins timing when the peak temperature T 1 Duration t of (2) 1 After exceeding the system internal setting time t, the control system 10 judges that the ignition has occurred in the blowing hood 2 at this time;
3) The control system 10 controls the driving motor 905 to rotate positively, the driving motor 905 respectively applies thrust to the gas sub-pull rod 901 and the nitrogen sub-pull rod 902 through the total pull rod 904, so that the gas valve 8 and the nitrogen valve 7 are driven to rotate, and the gas valve 8 is closed and the nitrogen valve 7 is opened at the same time;
4) When the temperature detecting device 4 detects that the temperature value T above the gas injection pipe row 303 in the injection cover 2 falls back to a normal value, the control system 10 judges that the interior of the injection cover 2 is extinguished at the moment;
5) The control system 10 controls the driving motor 905 to rotate reversely, the driving motor 905 respectively applies pulling force to the gas sub-pulling rod 901 and the nitrogen sub-pulling rod 902 through the total pulling rod 904, so that the gas valve 8 and the nitrogen valve 7 are driven to rotate, the gas valve 8 is opened, the nitrogen valve 7 is closed, and the device continues to produce.
The time t is set to 15s in the system.
Example 5
A gas injection method using the apparatus of example 1, comprising the steps of:
1) The device starts to operate, the gas injection device 3 starts to inject gas, and the control system 10 monitors the temperature value T above the gas injection tube row 303 in the injection cover 2 in real time through the temperature detection device 4;
2) In the real-time monitoring process, if the temperature value T has peak temperature T 1 The control system 10 begins timing when the peak temperature T 1 Duration t of (2) 1 After exceeding the system internal setting time t, the control system 10 judges that the ignition has occurred in the blowing hood 2 at this time;
3) The control system 10 controls the driving motor 905 to rotate positively, the driving motor 905 respectively applies thrust to the gas sub-pull rod 901 and the nitrogen sub-pull rod 902 through the total pull rod 904, so that the gas valve 8 and the nitrogen valve 7 are driven to rotate, and the gas valve 8 is closed and the nitrogen valve 7 is opened at the same time;
4) The control system 10 starts timing after the nitrogen valve 7 is opened, and when the nitrogen valve opening time reaches the system default nitrogen purge time t 2 Then, the control system 10 judges that the interior of the blowing hood 2 is extinguished at this time;
5) The control system 10 controls the driving motor 905 to rotate reversely, the driving motor 905 respectively applies pulling force to the gas sub-pulling rod 901 and the nitrogen sub-pulling rod 902 through the total pulling rod 904, so that the gas valve 8 and the nitrogen valve 7 are driven to rotate, the gas valve 8 is opened, the nitrogen valve 7 is closed, and the device continues to produce.
The time t is set to 15s in the system. System default nitrogen purge time t 2 30s.
Example 6
A gas injection method using the apparatus of example 2, comprising the steps of:
1) The device starts to operate, the gas injection device 3 starts to inject gas, and the control system 10 monitors the temperature value T above the gas injection tube row 303 in the injection cover 2 in real time through the temperature detection device 4;
2) In the real-time monitoring process, if the temperature value T has peak temperature T 1 The control system 10 begins timing when the peak temperature T 1 Duration t of (2) 1 After exceeding the system internal setting time t, the control system 10 judges that the ignition has occurred in the blowing hood 2 at this time;
3) The control system 10 controls the front chamber and the rear chamber of the cylinder 90601 to respectively perform exhaust and air intake operation through a front chamber electromagnetic valve 90604 and a rear chamber electromagnetic valve 90606 of the cylinder driving device 906, and drives the piston plate 90602 to move upwards so as to drive the total pull rod 904 to respectively apply thrust to the gas sub-pull rod 901 and the nitrogen sub-pull rod 902, thereby driving the gas valve 8 and the nitrogen valve 7 to rotate, and enabling the gas valve 8 to be closed and the nitrogen valve 7 to be opened;
4) When the temperature detecting device 4 detects that the temperature value T above the gas injection pipe row 303 in the injection cover 2 falls back to a normal value, the control system 10 judges that the interior of the injection cover 2 is extinguished at the moment;
5) The control system 10 controls the front chamber electromagnetic valve 90604 and the rear chamber electromagnetic valve 90606 of the cylinder driving device 906 to respectively perform air inlet and air exhaust operations on the front chamber and the rear chamber of the cylinder 90601, and drives the piston plate 90602 to move downwards so as to drive the total pull rod 904 to respectively apply pull force to the gas sub-pull rod 901 and the nitrogen sub-pull rod 902, thereby driving the gas valve 8 and the nitrogen valve 7 to rotate, enabling the gas valve 8 to be opened and simultaneously enabling the nitrogen valve 7 to be closed, and the device continues to perform production.
The time t is set to 20s in the system.
Example 7
A gas injection method using the apparatus of example 2, comprising the steps of:
1) The device starts to operate, the gas injection device 3 starts to inject gas, and the control system 10 monitors the temperature value T above the gas injection tube row 303 in the injection cover 2 in real time through the temperature detection device 4;
2) In the real-time monitoring process, if the temperature value T has peak temperature T 1 The control system 10 begins timing when the peak temperature T 1 Duration t of (2) 1 After exceeding the system internal setting time t, the control system 10 judges that the ignition has occurred in the blowing hood 2 at this time;
3) The control system 10 controls the front chamber and the rear chamber of the cylinder 90601 to respectively perform exhaust and air intake operation through a front chamber electromagnetic valve 90604 and a rear chamber electromagnetic valve 90606 of the cylinder driving device 906, and drives the piston plate 90602 to move upwards so as to drive the total pull rod 904 to respectively apply thrust to the gas sub-pull rod 901 and the nitrogen sub-pull rod 902, thereby driving the gas valve 8 and the nitrogen valve 7 to rotate, and enabling the gas valve 8 to be closed and the nitrogen valve 7 to be opened;
4) The control system 10 starts timing after the nitrogen valve 7 is opened, and when the nitrogen valve opening time reaches the system default nitrogen purge time t 2 Then, the control system 10 judges that the interior of the blowing hood 2 is extinguished at this time;
5) The control system 10 controls the front chamber electromagnetic valve 90604 and the rear chamber electromagnetic valve 90606 of the cylinder driving device 906 to respectively perform air inlet and air exhaust operations on the front chamber and the rear chamber of the cylinder 90601, and drives the piston plate 90602 to move downwards so as to drive the total pull rod 904 to respectively apply pull force to the gas sub-pull rod 901 and the nitrogen sub-pull rod 902, thereby driving the gas valve 8 and the nitrogen valve 7 to rotate, enabling the gas valve 8 to be opened and simultaneously enabling the nitrogen valve 7 to be closed, and the device continues to perform production.
The time t is set to 20s in the system. System default nitrogen purge time t 2 30s.
Claims (22)
1. A method for using a gas injection device, the device comprises a sintering machine trolley (1), an injection cover (2) and a gas injection device (3), wherein the gas injection device (3) comprises a gas injection main pipe (301), a gas injection branch pipe (302) and a gas injection pipe row (303), the sintering machine trolley (1) is positioned in the injection cover (2), the gas injection main pipe (301) is arranged at the outer side of the injection cover (2), the gas injection pipe row (303) is arranged above the sintering machine trolley (1), the gas injection pipe row (303) is positioned in the injection cover (2), and one end of the gas injection branch pipe (302) is connected with the gas injection main pipe (301) and the other end of the gas injection branch pipe (302) is connected with the gas injection pipe row (303); the method is characterized in that: the device also comprises a nitrogen pipeline (5) arranged at one side of the gas injection main pipe (301), and the nitrogen pipeline (5) is connected with the gas injection main pipe (301) through a connecting pipe (6); a nitrogen valve (7) is arranged on the connecting pipe (6); a gas valve (8) is arranged on the gas injection header pipe (301), and the gas valve (8) is arranged at the upstream of the connection position of the connecting pipe (6) and the gas injection header pipe (301); the device also comprises a synchronous control device which is connected with and controls the nitrogen valve (7) and the gas valve (8); the synchronous control device is a synchronous control pull rod device (9), the synchronous control pull rod device (9) comprises a gas separation pull rod (901), a nitrogen separation pull rod (902), a connecting cross rod (903), a total pull rod (904) and a driving device, wherein the gas separation pull rod (901) is connected with a gas valve (8), the nitrogen separation pull rod (902) is connected with a nitrogen valve (7), one end of the total pull rod (904) is respectively connected with the gas separation pull rod (901) and the nitrogen separation pull rod (902) through the connecting cross rod (903), and the other end of the total pull rod (904) is connected with the driving device; the device also comprises a temperature detection device (4) arranged at the side part of the injection cover (2), wherein the temperature detection device (4) stretches into the injection cover (2) and is positioned above the fuel gas injection tube row (303); the driving device is a driving motor (905); the device also comprises a control system (10), wherein the control system (10) is connected with the temperature detection device (4) and the driving motor (905);
The method comprises the following steps:
1) the device starts to operate, the gas injection device (3) starts to inject gas, and the control system (10) monitors the temperature value T above the gas injection tube row (303) in the injection cover (2) in real time through the temperature detection device (4);
2) In the real-time monitoring process, if the temperature value T has peak temperature T 1 The control system (10) starts timing when the peak temperature T 1 Duration t of (2) 1 After the time t is exceeded in the system, the control system (10) judges that the fire in the blowing cover (2) occurs at the moment;
3) The control system (10) controls the driving motor (905) to rotate positively, the driving motor (905) respectively applies thrust to the gas separation pull rod (901) and the nitrogen separation pull rod (902) through the total pull rod (904), so that the gas valve (8) and the nitrogen valve (7) are driven to rotate, and the gas valve (8) is closed and the nitrogen valve (7) is opened at the same time;
4) When the temperature detection device (4) detects that the temperature value T above the gas injection pipe row (303) in the injection cover (2) falls back to a normal value, or the control system (10) starts timing after the nitrogen valve (7) is opened, when the opening time of the nitrogen valve reaches the default nitrogen purging time T of the system 2 Afterwards; the control system (10) judges that the fire in the blowing cover (2) is extinguished at the moment;
5) The control system (10) controls the driving motor (905) to rotate reversely, the driving motor (905) respectively applies pulling force to the gas separation pull rod (901) and the nitrogen separation pull rod (902) through the total pull rod (904), so that the gas valve (8) and the nitrogen valve (7) are driven to rotate, the gas valve (8) is opened, the nitrogen valve (7) is closed, and the device continues to produce.
2. The method according to claim 1, characterized in that: the time t is set in the system to be 10-30s; and/or
Default nitrogen purge time t for the system 2 15-60s.
3. The method according to claim 2, characterized in that: the time t is set to be 12-25s in the system; and/or
Default nitrogen purge time t for the system 2 20-40s.
4. A method according to claim 3, characterized in that: the internal time t of the system is 15-20s.
5. The method according to any one of claims 1-4, wherein: the distance between the end of the temperature detection device (4) extending into the injection cover (2) and the gas injection tube row (303) is 50-300mm; and/or
The length of one end of the temperature detection device (4) extending into the blowing cover (2) is 10-200mm.
6. The method according to claim 5, wherein: the distance between the end of the temperature detection device (4) extending into the injection cover (2) and the gas injection tube row (303) is 100-200mm; and/or
The length of the end of the temperature detection device (4) extending into the blowing cover (2) is 50-150mm.
7. The method according to claim 6, wherein: the temperature detection device (4) is a thermocouple temperature sensor; and/or
The length of the end of the temperature detection device (4) extending into the blowing cover (2) is 80-100m.
8. The method according to any one of claims 1-4, wherein: 1-10 fuel gas injection branch pipes (302) are arranged on the fuel gas injection header pipe (301); and/or
2-50 gas injection pipes (304) are arranged on each gas injection pipe row (303); and/or
The gas injection pipe (304) is a gas injection sleeve (306) with 2 sections or more than 2 sections, and the gas injection sleeve (306) adopts a telescopic sleeve structure.
9. The method according to claim 8, wherein: 2-8 gas injection branch pipes (302) are arranged on the gas injection header pipe (301); and/or
3-20 gas injection pipes (304) are arranged on each gas injection pipe row (303); and/or
Each section of the fuel gas injection sleeve (306) is provided with a fuel gas injection hole (305).
10. The method according to claim 9, wherein: 2-100 gas injection holes (305) are arranged on each gas injection pipe (304).
11. The method according to claim 10, wherein: each gas injection pipe (304) is provided with 3-50 gas injection holes (305).
12. A method for using a gas injection device, the device comprises a sintering machine trolley (1), an injection cover (2) and a gas injection device (3), wherein the gas injection device (3) comprises a gas injection main pipe (301), a gas injection branch pipe (302) and a gas injection pipe row (303), the sintering machine trolley (1) is positioned in the injection cover (2), the gas injection main pipe (301) is arranged at the outer side of the injection cover (2), the gas injection pipe row (303) is arranged above the sintering machine trolley (1), the gas injection pipe row (303) is positioned in the injection cover (2), and one end of the gas injection branch pipe (302) is connected with the gas injection main pipe (301) and the other end of the gas injection branch pipe (302) is connected with the gas injection pipe row (303); the method is characterized in that: the device also comprises a nitrogen pipeline (5) arranged at one side of the gas injection main pipe (301), and the nitrogen pipeline (5) is connected with the gas injection main pipe (301) through a connecting pipe (6); a nitrogen valve (7) is arranged on the connecting pipe (6); a gas valve (8) is arranged on the gas injection header pipe (301), and the gas valve (8) is arranged at the upstream of the connection position of the connecting pipe (6) and the gas injection header pipe (301); the device also comprises a synchronous control device which is connected with and controls the nitrogen valve (7) and the gas valve (8); the synchronous control device is a synchronous control pull rod device (9), the synchronous control pull rod device (9) comprises a gas separation pull rod (901), a nitrogen separation pull rod (902), a connecting cross rod (903), a total pull rod (904) and a driving device, wherein the gas separation pull rod (901) is connected with a gas valve (8), the nitrogen separation pull rod (902) is connected with a nitrogen valve (7), one end of the total pull rod (904) is respectively connected with the gas separation pull rod (901) and the nitrogen separation pull rod (902) through the connecting cross rod (903), and the other end of the total pull rod (904) is connected with the driving device; the device also comprises a temperature detection device (4) arranged at the side part of the injection cover (2), wherein the temperature detection device (4) stretches into the injection cover (2) and is positioned above the fuel gas injection tube row (303); the driving device is a cylinder driving device (906); the cylinder driving device (906) comprises a cylinder (90601), a piston plate (90602), a front chamber air inlet pipe (90603), a front chamber electromagnetic valve (90604), a rear chamber air inlet pipe (90605) and a rear chamber electromagnetic valve (90606); wherein the piston plate (90602) is positioned inside the cylinder (90601), and the inside of the cylinder (90601) is divided into a front chamber and a rear chamber; the front chamber air inlet pipe (90603) is connected and communicated with the front chamber of the air cylinder (90601), the front chamber electromagnetic valve (90604) is connected with the front chamber air inlet pipe (90603), the rear chamber air inlet pipe (90605) is connected and communicated with the rear chamber of the air cylinder (90601), the rear chamber electromagnetic valve (90606) is connected with the rear chamber air inlet pipe (90605), and the piston plate (90602) is connected with one end of the total pull rod (904); the piston plate (90602) is horizontally arranged in the air cylinder (90601), and the total pull rod (904) is vertically connected with the piston plate (90602); the device also comprises a control system (10), wherein the control system (10) is connected with the temperature detection device (4), the front chamber electromagnetic valve (90604) and the rear chamber electromagnetic valve (90606);
The method comprises the following steps:
1) the device starts to operate, the gas injection device (3) starts to inject gas, and the control system (10) monitors the temperature value T above the gas injection tube row (303) in the injection cover (2) in real time through the temperature detection device (4);
2) In the real-time monitoring process, if the temperature value T has peak temperature T 1 The control system (10) starts timing when the peak temperature T 1 Duration t of (2) 1 After the time t is exceeded in the system, the control system (10) judges that the fire in the blowing cover (2) occurs at the moment;
3) The control system (10) controls the front chamber electromagnetic valve (90604) and the rear chamber electromagnetic valve (90606) of the air cylinder driving device (906) to respectively exhaust and intake air in the front chamber and the rear chamber of the air cylinder (90601), drives the piston plate (90602) to move upwards, and further drives the total pull rod (904) to respectively apply thrust to the gas split pull rod (901) and the nitrogen split pull rod (902), so that the gas valve (8) and the nitrogen valve (7) are driven to rotate, and the gas valve (8) is closed while the nitrogen valve (7) is opened;
4) When the temperature detection device (4) detects that the temperature value T above the gas injection pipe row (303) in the injection cover (2) falls back to a normal value, or the control system (10) starts timing after the nitrogen valve (7) is opened, when the opening time of the nitrogen valve reaches the default nitrogen purging time T of the system 2 Afterwards; the control system (10) judges that the fire in the blowing cover (2) is extinguished at the moment;
5) The control system (10) controls the front chamber electromagnetic valve (90604) and the rear chamber electromagnetic valve (90606) of the air cylinder driving device (906) to respectively perform air inlet and air exhaust operation on the front chamber and the rear chamber of the air cylinder (90601), drives the piston plate (90602) to move downwards, and further drives the total pull rod (904) to respectively apply pulling force to the gas split pull rod (901) and the nitrogen split pull rod (902), so that the gas valve (8) and the nitrogen valve (7) are driven to rotate, the gas valve (8) is opened, the nitrogen valve (7) is closed, and the device continues to produce.
13. The method according to claim 12, wherein: the time t is set in the system to be 10-30s; and/or
Default nitrogen purge time t for the system 2 15-60s.
14. The method according to claim 13, wherein: the time t is set to be 12-25s in the system; and/or
Default nitrogen purge time t for the system 2 20-40s.
15. The method according to claim 14, wherein: the internal time t of the system is 15-20s.
16. The method according to any one of claims 12-15, characterized in that: the distance between the end of the temperature detection device (4) extending into the injection cover (2) and the gas injection tube row (303) is 50-300mm; and/or
The length of one end of the temperature detection device (4) extending into the blowing cover (2) is 10-200mm.
17. The method according to claim 16, wherein: the distance between the end of the temperature detection device (4) extending into the injection cover (2) and the gas injection tube row (303) is 100-200mm; and/or
The length of the end of the temperature detection device (4) extending into the blowing cover (2) is 50-150mm.
18. The method according to claim 17, wherein: the temperature detection device (4) is a thermocouple temperature sensor; and/or
The length of the end of the temperature detection device (4) extending into the blowing cover (2) is 80-100m.
19. The method according to any one of claims 12-15, characterized in that: 1-10 fuel gas injection branch pipes (302) are arranged on the fuel gas injection header pipe (301); and/or
2-50 gas injection pipes (304) are arranged on each gas injection pipe row (303); and/or
The gas injection pipe (304) is a gas injection sleeve (306) with 2 sections or more than 2 sections, and the gas injection sleeve (306) adopts a telescopic sleeve structure.
20. The method according to claim 19, wherein: 2-8 gas injection branch pipes (302) are arranged on the gas injection header pipe (301); and/or
3-20 gas injection pipes (304) are arranged on each gas injection pipe row (303); and/or
Each section of the fuel gas injection sleeve (306) is provided with a fuel gas injection hole (305).
21. The method according to claim 20, wherein: 2-100 gas injection holes (305) are arranged on each gas injection pipe (304).
22. The method according to claim 21, wherein: each gas injection pipe (304) is provided with 3-50 gas injection holes (305).
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