CN110306000B - Blowing-out method and spray gun device for blast furnace dissection research - Google Patents
Blowing-out method and spray gun device for blast furnace dissection research Download PDFInfo
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- CN110306000B CN110306000B CN201910702653.7A CN201910702653A CN110306000B CN 110306000 B CN110306000 B CN 110306000B CN 201910702653 A CN201910702653 A CN 201910702653A CN 110306000 B CN110306000 B CN 110306000B
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Abstract
The invention discloses a blowing-out method and a spray gun device for blast furnace dissection research, which are characterized by comprising the following steps: 1) designing and manufacturing a spray gun device for spraying filler into a blast furnace tuyere raceway; 2) the blast furnace is subjected to short-term damping down, the spray gun device is arranged at a part of the tuyere of the blast furnace, and the blast furnace is rebleed after the installation of the spray gun device is finished; 3) the blast furnace is cooled down to ensure that the theoretical combustion temperature in front of the tuyere is not higher than the melting point temperature of the filler; 4) connecting the spray gun device with a spraying machine, and spraying filler into a blast furnace tuyere convolution area; 5) effectively cutting off gas after the blast furnace is stopped, and keeping the cooling equipment of the blast furnace to be cooled normally; 6) introducing N2 gas into the blast furnace to cool the furnace burden; 7) and inserting a thermocouple, and connecting the thermocouple into a central control computer to observe the temperature field change until the furnace cooling is finished. The blowing-out method and the spray gun device for the blast furnace dissection research can better keep the original state of furnace burden of each section of the blast furnace, are convenient for research and analysis, and have better application prospect.
Description
Technical Field
The invention belongs to the technical field of blast furnace anatomy research, and particularly relates to a blowing-out method and a spray gun device for blast furnace anatomy research.
Background
The blast furnace is dissected, the structural shape, proportion and distribution of the furnace burden in the blast furnace can be known to the maximum extent, and the change of furnace burden elements in the furnace along with the running state can be known and mastered. Through reasonable furnace shutdown of the blast furnace, the original state of furnace burden of each section of the blast furnace can be kept to the maximum extent, the original state comprises a blocky belt, a soft melting belt, a hearth dead material column, a tuyere raceway, a dead iron layer and a hearth erosion shape, and research on the change of coke melting loss in the blast furnace in the radial direction of the blast furnace, the distribution of harmful elements and the influence on the furnace burden, a cooling wall, refractory materials and the like can be deeply carried out. At present, after capacity is removed, permanent blowing-out of a small blast furnace provides excellent opportunity for blast furnace anatomy, investment cost is low, research time is sufficient, determination of a blowing-out method for blast furnace anatomy research is a key point, and the prior art does not have deep research on the aspect.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a blowing-out method and a spray gun device for blast furnace anatomy research, which can better retain the original state of furnace burden of each section of a blast furnace and are convenient for research and analysis.
In order to achieve the purpose, the invention adopts the technical scheme that: the furnace shutting method for the blast furnace anatomy research is characterized by comprising the following steps: 1) designing and manufacturing a spray gun device for spraying filler into a blast furnace tuyere raceway; 2) the blast furnace is subjected to short-term damping down, the spray gun device is arranged at a part of the tuyere of the blast furnace, and the blast furnace is rebleed after the installation of the spray gun device is finished; 3) the blast furnace is cooled down to ensure that the theoretical combustion temperature in front of the tuyere is not higher than the melting point temperature of the filler; 4) connecting the spray gun device with a spraying machine, and spraying filler into a blast furnace tuyere convolution area; 5) effectively cutting off gas after the blast furnace is stopped, and keeping the cooling equipment of the blast furnace to be cooled normally; 6) introducing N2 gas into the blast furnace to cool the furnace burden; 7) and (3) drilling an iron notch channel along with the continuous descending of the temperature of the furnace body wall body, inserting a thermocouple, and connecting the thermocouple into a central control computer to observe the change of a temperature field until the furnace cooling is finished.
In order to make the technical scheme more detailed and concrete, the invention also provides the following further preferable technical scheme to obtain satisfactory practical effect:
and in the step 2), introducing compressed air into the spray gun to cool the spray gun 1-2 minutes before the blast furnace is re-ventilated.
The filler is alumina expanded bead fine powder, and the amount of the alumina expanded bead fine powder is controlled according to the amount of 1m3 of each tuyere and is added into a collecting hopper of the spraying machine for standby.
In the step 3), the cold air valve of the air supply hot air furnace is closed by 80% after the air mixing valve is fully opened, and the air temperature is adjusted according to the temperature lower than 500 ℃.
And in the step 4), opening a discharge valve of the spraying machine to start spraying the filling material to a rotary area of the blast furnace tuyere, simultaneously spraying and filling 2-4 tuyeres, and controlling the spraying time according to 15-20 min.
And 5), blowing down the blast furnace in a backflow mode according to long-term blowing down, loosening a connecting pin of an elbow of a blast furnace air inlet system, inserting a stainless steel blind plate into the elbow and the spherical surface of the connecting pipe, tightening the connecting pin, and ensuring that the blast furnace body and the hot blast furnace system are effectively cut off.
And 5), keeping the cooling water quantity of the blast furnace cooling equipment at a normal quantity for supplying water, closing all water inlet valves of the water leakage cooling wall, cutting off the pipe heads of the water inlet and outlet pipes, blowing the residual cooling water in the pipes by using compressed air, and welding and repairing the cavity of the furnace shell by using a steel plate after water stemming is blocked so as to ensure that the steel plate of the furnace body is not leaked with air.
And when the blast furnace is permanently stopped, the last blast furnace iron time is operated according to the full wind of the normal blast furnace, coal injection is stopped, oxygen enrichment is stopped, and the full coke is smelted.
The spray gun device comprises a spray gun main pipe, wherein a cooling boosting pipe for cooling the spray gun main pipe is arranged on the spray gun main pipe, one end of the spray gun main pipe is connected with a spraying machine, one end of the cooling boosting pipe is connected with a compressed air bag, and a spray gun main ball valve and a cooling pipe ball valve are respectively arranged on the spray gun main pipe and the cooling boosting pipe.
The spraying machine is connected to the compressed air bag through a connecting pipeline, and a spraying machine boosting ball valve is arranged on the connecting pipeline.
Compared with the prior art, the invention has the following advantages: the blowing-out method and the spray gun device for the blast furnace dissection research can better keep the original state of furnace burden of each section of the blast furnace, are convenient for research and analysis, and have better application prospect.
Drawings
The contents of the drawings and the reference numerals in the drawings of the present specification will be briefly described as follows:
FIG. 1 is a schematic view of the structure of a spray gun apparatus according to the present invention;
FIG. 2 is a schematic view of a waist plate structure of an air inlet elbow;
FIG. 3 is a schematic view of the connection structure of the spray gun apparatus of the present invention.
In the drawings, the reference numbers: 10. a main pipe of the spray gun; 101. a main ball valve of the spray gun; 102. a coating machine connecting pipe; 20. cooling the boosting pipe; 201. a cooling tube ball valve; 202. the cooling pipe is connected with a short pipe; 30. an air inlet elbow waist plate; 40. a spray coater; 401. a discharge pipe of the spraying machine; 402. the boosting air ball valve of the spraying machine; 50. a blast furnace tuyere raceway 60, a tuyere small sleeve 70 and a compressed air bag.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
The invention relates to a furnace shutdown method for blast furnace anatomy research, which comprises the following steps: 1) designing and manufacturing a spray gun device for spraying filler into a blast furnace tuyere raceway; 2) the blast furnace is subjected to short-term damping down, the spray gun device is arranged at a part of the tuyere of the blast furnace, and the blast furnace is re-ventilated after the installation of the spray gun device is finished; 3) the blast furnace is cooled down to ensure that the theoretical combustion temperature in front of the tuyere is not higher than the melting point temperature of the filler; 4) connecting the spray gun device with a spraying machine, and spraying filler into a blast furnace tuyere convolution area; 5) effectively cutting off gas after the blast furnace is stopped, and keeping the cooling equipment of the blast furnace to be cooled normally; 6) introducing N2 gas into the blast furnace to cool the furnace burden; 7) and (3) drilling an iron notch channel along with the continuous descending of the temperature of the furnace body wall body, inserting a thermocouple, and connecting the thermocouple into a central control computer to observe the change of a temperature field until the furnace cooling is finished.
The invention relates to a blowing-out method for blast furnace dissection research, which selects tuyere raceway filler to be sprayed into a tuyere raceway under the full-wind state of a blast furnace, and provides a new idea for blast furnace raceway research; the determination of the injection time of the filling material and the determination of the blast furnace that the temperature of the blast furnace is greatly reduced to reduce the theoretical combustion temperature before the tuyere ensure that the theoretical combustion temperature before the tuyere is lower than the melting point of the filling material. The gas of the blast furnace and the hot blast stove system is quickly blocked, the time is saved and the speed is highQuickly entering the cooling stage of the blast furnace burden. Coal injection by blast furnace N2The conveying system leads cooling medium N into the blast furnace through the injection main pipe2The gas method is feasible, has good effect, and is safe and reliable.
In the invention, when the blast furnace is permanently stopped, the last blast furnace iron time is operated according to the full wind of the normal blast furnace, the coal injection is stopped, the oxygen enrichment and the full coke smelting are stopped, and the characteristics of the blast furnace when the blast furnace is in the normal shape can be kept to the maximum extent.
The present invention relates to a blast furnace anatomy research blowing-out scheme, including determination of air supply system, heat system and charging system when blowing out, air temperature formulation, filling material spraying time, spraying speed and spraying quantity determination. The blast furnace anatomy research blowing-out scheme comprises the steps of cutting off gas after blowing out, connecting cooling medium and making a blast furnace cooling scheme.
In the step 2), compressed air is introduced into the spray gun to cool the spray gun 1-2 minutes before the blast furnace is re-ventilated. The connection hose of the cooling boosting pipe 20 and the compressed air bag 70 is connected 1 minute before the blast furnace is re-ventilated, the compressed air is communicated, and the cooling spray gun is cooled by gradually opening the large cooling pipe ball valve 201. And after the spray gun group is installed, the blast furnace is re-ventilated.
In the invention, the filler is alumina expanded bead fine powder, and the amount of the alumina expanded bead fine powder is controlled according to the amount of 1m3 of each tuyere and is added into a collecting hopper of the spraying machine for standby. The fine particle size of the alumina expanded bead fine powder is less than 0.1mm of spherical solid particles, the melting point is higher than 1800 ℃, the alumina expanded bead fine powder is guaranteed not to be melted before a tuyere in an air supply state, and a low-melting-point substance is not formed with coke ash in front of the tuyere, so that the alumina expanded bead fine powder has the characteristics of good fluidity and easiness in conveying.
In the step 3), the cold air valve of the air supply hot air furnace is closed by 80 percent after the air mixing valve is fully opened, and the air temperature is adjusted according to the temperature lower than 500 ℃. In order to ensure that the alumina expanded bead fine powder is not melted in front of the tuyere and quickly molded to occupy the bird nest space in the rotary area of the tuyere, the blast furnace adopts a quick air-removing temperature, an air-cooling valve of an air-supplying hot blast furnace is closed by 80 percent after a fully-opened air-mixing valve, the air temperature is adjusted according to the temperature lower than 500 ℃, and the theoretical combustion temperature in front of the tuyere is ensured to be not higher than the melting point temperature of the filler to the maximum extent. The theoretical combustion temperature in front of the tuyere is according to an empirical formula:
air temperature of 1570+0.808T, blast humidity of 5.85W, coal of-2.50W and oxygen of 4.37W
Theory of the formula- -theoretical combustion temperature in front of tuyere,. degree.C
T wind temperature- -Hot wind temperature,. degree.C
W blast humidity- -blast humidity, g/m3
W coal- -blowing amount, kg/1000m3 wind
W oxygen- -1000m3 wind oxygen content m3
In the step 4), the discharge valve of the spraying machine is opened to spray the filling material to the rotary area of the tuyere of the blast furnace, 2 to 4 tuyeres are sprayed and filled simultaneously, and the spraying time is controlled according to 15 to 20 min. A discharging pipe 401 of a spraying machine of the spraying machine 40 is connected with a connecting pipe 102 of the spraying machine through a pipeline, compressed air is introduced, the spraying machine is connected with a spraying gun by fully opening a main ball valve 101 of the spraying gun, a discharging valve of the spraying machine is opened, a boosting ball valve 402 of the spraying machine is opened to start to spray filler to a blast furnace tuyere raceway 50, 2-4 air openings are simultaneously sprayed and filled, the spraying time is controlled according to 15-20min, and the situation that the iron openings basically come after the tuyere raceway is completely filled is ensured. After the blast furnace is plugged, according to the damping-down procedure, reducing air, cutting coal gas and long-term damping-down operation, igniting at the top of the blast furnace
In the invention, in the step 5), the blast furnace stops the wind by backflow according to the long-term stop wind, the elbow connecting pin of the blast furnace air inlet system is loosened, the stainless steel blind plate is inserted into the elbow and the spherical surface of the connecting pipe, and the connecting pin is tightened, so that the blast furnace body and the hot blast furnace system are effectively cut off. The stainless steel blind plate with the thickness delta equal to 1mm can be inserted into the spherical surfaces of the elbow and the connecting pipe, and the gas is effectively cut off at the front section of the tuyere while N is sent from the coal injection gun2The gas-cooled charge ensures a channel.
In the step 5), the cooling water quantity of the blast furnace is kept to be normally cooled, all water inlet valves of the water leakage cooling wall are closed, the pipe heads of the water inlet and outlet pipes are cut off, the residual cooling water in the pipes is blown by compressed air, and after water stemming is blocked, the cavity of the furnace shell is welded by a steel plate, so that the steel plate of the furnace body is ensured to be airtight. Meanwhile, the furnace shell is welded and repaired to be cracked, air leakage of bolts is realized, and air leakage points of the water inlet pipe, the water outlet pipe and the corrugated pipe are prevented, so that nitrogen and coal gas are prevented from leaking in the furnace charge cooling process.
In the invention, in step 6), after the material level of the furnace top is checked, the bleeding valve of the furnace top is fixed, so as to prevent the valve body from being closed automatically or for other reasons, and to prevent the manhole of the furnace top from being closed (for example, the access door of the furnace top is opened, and the closing must be arranged at the same time). By coal injection N2The conveying system leads N into the blast furnace through a blowing pipe network2And (4) introducing nitrogen into all the other tuyeres from the coal gun for cooling the furnace charge except the tuyere provided with the sprayed filler and incapable of delivering nitrogen.
In the invention, in the step 7), an iron notch channel is drilled along with the continuous descending of the temperature of the furnace body wall body, a condition is created for inserting a thermocouple, the iron notch is inserted into a thermocouple with the upper limit length and half length of a normal channel, 2-3 air ports are selected, a thermocouple with the depth of 1-1.5m is inserted, and the corrected thermocouple is connected into a central control computer to observe the temperature field change until the furnace cooling is finished.
The invention also provides a spray gun device, as shown in fig. 1, 2 and 3, which comprises a spray gun main pipe 10, wherein a cooling boosting pipe 20 for cooling the spray gun main pipe 10 is arranged on the spray gun main pipe 10, one end of the spray gun main pipe 10 is connected with a spraying machine 40, one end of the cooling boosting pipe 20 is connected with a compressed air bag 70, and a spray gun main ball valve 101 and a cooling pipe ball valve 201 are respectively arranged on the spray gun main pipe 10 and the cooling boosting pipe 20. The applicator 40 is connected to the compressed air bag 70 by a connecting line having an applicator boost ball valve 402.
A cooling boosting pipe 20 welded on the spray gun main pipe 10 according to an included angle of 45 degrees is provided with a spray gun main ball valve 101 and a coating machine connecting pipe 102, and the coating machine connecting pipe is connected to a coating machine discharging pipe 401 through a connecting pipe; the cooling tube connection stub 202 is connected by a connection line to the compressed air bag 70, by means of which the lance is cooled.
In the invention, the air inlet elbow waist sub-plate 30 is processed, and the air inlet elbow waist sub-plate 30 and the spray gun main pipe 10 are fully welded by welding bars according to the distance from the waist sub-plate to the front section of the air port small sleeve, so as to ensure that the front end of the spray gun main pipe does not grind the air port small sleeve, thus the air inlet elbow waist sub-plate 30 and the spray gun main pipe 10 are integrated. The coal gun is pulled out after the blast furnace is shut down, the spray gun assembly is inserted, the waist plate and the air inlet system are connected through the bolts, and the blast furnace is prevented from leaking air after air supply.
Manufacturing a spray gun in advance, damping down the blast furnace for a short time, measuring the size of a relevant spare part of which the front end of the spray gun is flush with the outlet section of the tuyere small sleeve 60, welding the spray gun and the reamed kidney plate well, connecting the spray gun and the reamed kidney plate to be used as cooling medium compressed air (the compressed air pressure is more than 450kPa), installing the spray gun and the kidney plate assembly, ventilating the compressed air to cool the spray gun and checking that no air leakage phenomenon exists, re-ventilating the blast furnace, and enabling the spray gun to have the condition of spraying filler to a tuyere convolution area at any time. .
In the invention, the operation of full air quantity, no coke blowing and blowing, no material line lowering and no hearth residual iron discharging is completely different from the traditional operation, and the blast furnace model characteristic during the normal production of the blast furnace can be kept to the maximum extent, so that the mode of blowing high-melting-point filler from part of the tuyere of the blast furnace is adopted to increase and research the convoluted region of the tuyere of the blast furnace, which is one of innovation points. After the furnace is shut down, the connection between the blast furnace and a gas system is quickly cut off, the furnace cooling stage is quickly started on the premise of ensuring safety, and a proper furnace cooling medium and a proper circuit are selected to realize the furnace cooling target. And installing a temperature monitoring point to track the progress of the cooling furnace.
The method for rapidly and permanently blowing out the blast furnace, sealing coal gas and safely cooling the furnace charge in the blast furnace after the high-melting-point filler is injected from a part of the tuyere of the blast furnace under the conditions of no blowing-out coke and full wind of the blast furnace provides guarantee for reducing the original appearance of the production to the maximum extent by the anatomy of the blast furnace, and has guiding significance for the research of the smelting mechanism of the blast furnace and the production practice.
The blowing-out method and the spray gun device for the blast furnace dissection research can better keep the original state of furnace burden of each section of the blast furnace, are convenient for research and analysis, and have better application prospect.
The invention has been described above with reference to the accompanying drawings, but the invention is not limited to the above-described embodiments, and it is within the scope of the invention to use various insubstantial modifications of the inventive concept and solutions or to apply them directly to other applications.
Claims (2)
1. A furnace shutdown method for blast furnace anatomy research is characterized by comprising the following steps: 1) designing and manufacturing a spray gun device for spraying filler into a tuyere raceway of the blast furnace, so that the filler is sprayed into the tuyere raceway under the full-wind state of the blast furnace; 2) the blast furnace is subjected to short-term damping down, the spray gun device is arranged at a part of air ports of the blast furnace, the blast furnace is rebleed after the installation of the spray gun device is finished, and compressed air is introduced into the spray gun to cool the spray gun 1-2 minutes before the rebleed of the blast furnace; 3) the blast furnace is cooled down to ensure that the theoretical combustion temperature in front of the tuyere is not higher than the melting point temperature of the filler; 4) connecting the spray gun device with a spraying machine, and spraying filler into a blast furnace tuyere convolution area; 5) effectively cutting off gas after the blast furnace is stopped, and keeping the cooling equipment of the blast furnace to be cooled normally; 6) introducing N2 gas into the blast furnace to cool the furnace burden; 7) drilling an iron notch channel along with the continuous descending of the temperature of the furnace body wall body, inserting a thermocouple, and connecting the thermocouple into a central control computer to observe the change of a temperature field until the furnace cooling is finished;
in the step 3), closing 80% of a cold air valve of an air supply hot air furnace after fully opening the air mixing valve, and adjusting the air temperature according to the temperature lower than 500 ℃;
in the step 4), opening a discharge valve of a spraying machine to start spraying the filling material to a rotary area of a blast furnace tuyere, simultaneously spraying and filling 2-4 tuyeres, and controlling the spraying time according to 15-20 min;
in the step 5), the blast furnace stops blowing in a backflow mode according to long-term stopping blowing, the connecting pin of the elbow of the air inlet system of the blast furnace is loosened, the stainless steel blind plate is inserted into the spherical surfaces of the elbow and the connecting pipe, and the connecting pin is tightened to ensure that the blast furnace body and the hot blast furnace system are effectively cut off; the cooling water quantity of the blast furnace cooling equipment is kept to supply water in a normal quantity, all water inlet valves of the water leakage cooling wall are closed, water pipe heads of inlet and outlet water are cut off, the residual cooling water in the pipe is blown and swept by compressed air, and after water stemming is blocked, a furnace shell cavity is welded and repaired by a steel plate, so that the steel plate of a furnace body is ensured to be airtight;
in the step 6), after the material surface of the furnace top is checked, a bleeding valve of the furnace top is fixed to prevent the valve body from being closed automatically or due to other reasons, a manhole of the furnace top is closed, and coal injection N is used for passing through2The conveying system leads N into the blast furnace through a blowing pipe network2And (4) qi.
2. The blow-out method for blast furnace anatomy research according to claim 1, characterized in that: and when the blast furnace is permanently stopped, the last blast furnace iron time is operated according to the full wind of the normal blast furnace, coal injection is stopped, oxygen enrichment is stopped, and the full coke is smelted.
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