CN111979370A - Blast furnace blow-in oxygen lance and blow-in method - Google Patents
Blast furnace blow-in oxygen lance and blow-in method Download PDFInfo
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- CN111979370A CN111979370A CN202010885375.6A CN202010885375A CN111979370A CN 111979370 A CN111979370 A CN 111979370A CN 202010885375 A CN202010885375 A CN 202010885375A CN 111979370 A CN111979370 A CN 111979370A
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- compressed air
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 239000001301 oxygen Substances 0.000 title claims abstract description 102
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 225
- 229910052742 iron Inorganic materials 0.000 claims abstract description 113
- 239000007789 gas Substances 0.000 claims abstract description 36
- 239000002893 slag Substances 0.000 claims description 29
- 238000007664 blowing Methods 0.000 claims description 16
- 239000000571 coke Substances 0.000 claims description 16
- 238000010079 rubber tapping Methods 0.000 claims description 16
- 244000144985 peep Species 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 7
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 229910001882 dioxygen Inorganic materials 0.000 claims description 3
- 208000008918 voyeurism Diseases 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 241001669679 Eleotris Species 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- 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
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention discloses a blast furnace blow-in oxygen lance, which comprises an oxygen lance body and is characterized in that the oxygen lance body comprises an iron notch connecting section and an air source connecting section, wherein the iron notch connecting section comprises an iron notch connecting inner pipe and an iron notch connecting outer pipe, the inner thread section of the air source connecting section is in threaded connection with the external thread connecting part of the iron notch connecting section, the first compressed air conveying channel and the second compressed air conveying channel form a communicated compressed air conveying channel, and the air source connecting inner pipe and the iron notch connecting inner pipe form a communicated oxygen conveying channel. The invention also discloses a method for opening the furnace by using the oxygen lance, and the oxygen lance is divided into the iron notch connecting section and the gas source connecting section, wherein the gas source connecting section can be recycled, namely, the part except the iron notch can be effectively recycled, the part can be disconnected in time, the furnace opening cost is saved, the manufacturing difficulty can be reduced, only the part deep into the iron notch is manufactured during each furnace opening, the rear section can be repeatedly used, and the furnace opening efficiency is greatly improved.
Description
Technical Field
The invention belongs to the technical field of blast furnace blow-in, and particularly relates to a blast furnace blow-in oxygen lance and a blow-in method.
Background
Blast furnace blow-in is taken as a complex systematic work, the heating of furnace hearth is the key point of blast furnace blow-in, also is the important factor that determines the success of blow-in, at present widely thinks that oxygen rifle blow-in can heat the furnace hearth fast, and the environmental protection situation of growing up is stopped iron notch blow-in moreover, can only use the oxygen rifle blow-in. The success rate of furnace opening is improved, but the actual effect of oxygen lance furnace opening is determined by the using method of the oxygen lance and the specific adjusting method of oxygen and air, in the process of furnace opening of domestic blast furnaces, the oxygen lance is improperly used, so that the oxygen lance is burnt, the time of furnace opening of the blast furnace is prolonged, a furnace cylinder is not well heated, the temperature of slag iron is low and the slag iron does not flow easily, and great difficulty is caused for removing iron in furnace opening.
The oxygen lance blowing-in is a blowing-in form commonly adopted at present, most of the existing oxygen lances are sleeve-type, air and oxygen are simply introduced, the oxygen lances are adjusted through valves, the operation is rough and spacious, the oxygen lances cannot be accurately adjusted, the oxygen lances are basically burnt after tapping, the oxygen lances cannot be recycled, and the oxygen lances are also wasted.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a blast furnace blow-in oxygen lance and a blow-in method,
the invention is realized in this way, a blast furnace blow-in oxygen lance, comprising an oxygen lance body, and is characterized in that the oxygen lance body comprises an iron notch connecting section and a gas source connecting section, wherein the iron notch connecting section comprises an iron notch connecting inner pipe and an iron notch connecting outer pipe, the iron notch connecting inner pipe is connected with the iron notch connecting outer pipe through a support rib, and a first compressed air conveying channel is formed between the iron notch connecting inner pipe and the iron notch connecting outer pipe; the iron notch connecting section is inserted into the iron notch section and is provided with a groove, and the other end of the iron notch connecting section is provided with an external thread connecting part;
the gas source connecting section comprises a gas source connecting inner pipe and a gas source connecting outer pipe, and the gas source connecting inner pipe is connected with the gas source connecting outer pipe through a supporting rib; one end of the air source connecting section is provided with an internal thread section matched with the external thread connecting part of the taphole connecting section; the air source connecting section of the air source connecting section is connected with a compressed air conveying pipe and an oxygen supply conveying pipe; the compressed air conveying pipe and the oxygen supply conveying pipe are respectively provided with a set of accumulative flowmeter and instantaneous flowmeter; a second compressed air conveying channel is formed between the air source connecting inner pipe and the air source connecting outer pipe, wherein the high-pressure air source conveying pipe is communicated with the second compressed air conveying channel; the oxygen supply conveying pipe is communicated with the air source connecting inner pipe; the end part of the air source connecting section at the air source connecting side is provided with a peep sight;
the internal thread section of the air source connecting section is in threaded connection with the external thread connecting part of the iron notch connecting section, the first compressed air conveying channel and the second compressed air conveying channel form a communicated compressed air conveying channel, and the air source connecting inner tube and the iron notch connecting inner tube form a communicated oxygen conveying channel.
The invention also discloses a blow-in method based on the oxygen lance, which is characterized in that: before opening the furnace, inserting the iron notch connecting section of the oxygen lance into the iron notch, and enabling the air outlet to face upwards;
in the stage of supplying heat to blast furnace hearth by burning coke in the initial stage of blow-on, i.e. within 5 hr of blow-on, the coke is burnt in this stage, so that the oxygen lance is firstly ensured not to burn out, and the oxygen supply with lower flow rate is controlled, and the supply rate is 5m3Per hour, the compressed air supply with a higher flow rate is controlled, and the maximum supply amount is 60m3The air is mainly used for cooling the oxygen lance, avoiding burnout, observing the state of an iron notch through a sight glass at any time, and keeping the front section of the oxygen lance not to be bright; this indicates that the lance front section is not burning.
In the middle stage of furnace opening, i.e. 5-10 hr, at the moment of beginning to gradually produce small amount of slag, the flow rate of oxygen gas should be gradually increased to 8-10m3The flow of the compressed air is kept unchanged, and the flow of the compressed air is adjusted according to the condition of the peep hole; if the inside of the peeping lens is still dark, the flow of air can be properly reduced by 2-3m3And h, continuing to observe the condition in the peep lens, wherein the condition in the peep lens is slightly lightened, the oxygen and compressed air flow can be kept, if the peep lens is bright and the air flow is adjusted to be maximum, the oxygen flow can be properly reduced by 2-3m each time3The oxygen flow per hour is observed for about 10 minutes, and the next adjustment is carried out。
In the later period of the furnace opening, namely one hour before tapping, the tapping of the front iron notch needs to be carried out in the specified time, and the oxygen flow is opened to the maximum amount of 15-20m3Reducing the flow of the compressed air at the same time until the flow of the compressed air is turned off to 0, rapidly raising the temperature of the iron notch connecting section, improving the heat of a furnace hearth, and enabling an oxygen lance seen from a sight glass to be bright until the oxygen lance is burnt out, and enabling iron slag to flow out of an iron notch channel;
the gas source connecting section is used for timely disconnecting the gas source connection part and carrying out tapping operation on the tap hole if the phenomenon of slag iron burning occurs when the generated slag iron meets the total amount requirement of the first tapping in the process of blowing in the furnace; if the condition that the iron slag is burnt out does not occur within the specified time, the oxygen is opened to the maximum value and the compressed air is closed for more than 30min, and the iron slag still does not flow out, the air source connecting section needs to be cut off, and the iron notch needs to be opened, so that the iron slag can flow out in time.
In the whole blow-in process, the flow is adjusted according to the condition of observing the sight glass on site, and the accumulated total consumption of the compressed air should be 500-700m3The total oxygen consumption is 80-150m3。
The oxygen lance is divided into the iron notch connecting section and the gas source connecting section, wherein the gas source connecting section can be recycled, namely, the part except the iron notch can be effectively recycled, the part can be disconnected in time, the blow-in cost is saved, the manufacturing difficulty can be reduced, only the part deep into the iron notch is manufactured during each blow-in, the rear section can be repeatedly used, and the blow-in efficiency is greatly improved; in addition, the state change of the taphole is easy to control, namely the state of the taphole and the working state of the hearth can be effectively controlled through the accurate adjustment of oxygen and compressed air, the hearth is heated in time, and the iron slag is discharged in time.
Drawings
FIG. 1 is a schematic view of a lance configuration;
FIG. 2 is a graph comparing wind velocity.
In the figure, 1, an oxygen lance body; 1-1, a taphole connecting section; 1-10, connecting an iron notch with an inner pipe; 1-11, connecting an iron notch with an outer pipe; 1-12, support ribs; 1-13, a first compressed air delivery channel; 1-14, an external threaded connection; 1-2, an air source connecting section; 1-20, connecting an air source with an inner pipe; 1-21, connecting an air source with an outer pipe; 1-22, support ribs; 1-23, an internal thread section; 1-24, compressed air conveying pipe; 1-25, oxygen supply conveying pipe; 1-26, cumulative flow meter; 1-27, instantaneous flow meter; 1-28, a second compressed air delivery channel; 2. a sight glass; 3. an oxygen delivery channel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the blast furnace blow-in oxygen lance comprises an oxygen lance body 1, wherein the oxygen lance body comprises an iron notch connecting section 1-1 and a gas source connecting section 1-2, the iron notch connecting section comprises an iron notch connecting inner pipe 1-10 and an iron notch connecting outer pipe 1-11, the iron notch connecting inner pipe is connected with the iron notch connecting outer pipe through a support rib 1-12, and a first compressed air conveying channel 1-13 is formed between the iron notch connecting inner pipe and the iron notch connecting outer pipe; the iron notch connecting section is inserted into the iron notch section and is provided with a groove, and the other end of the iron notch connecting section is provided with an external thread connecting part 1-14;
the gas source connecting section 1-2 comprises a gas source connecting inner pipe 1-20 and a gas source connecting outer pipe 1-21, and the gas source connecting inner pipe is connected with the gas source connecting outer pipe through support ribs 1-22; one end of the air source connecting section is provided with an internal thread section 1-23 matched with the external thread connecting part of the taphole connecting section; the air source connecting section of the air source connecting section is connected with compressed air conveying pipes 1-24 and oxygen supply conveying pipes 1-25; the compressed air delivery pipe and the oxygen supply delivery pipe are provided with an accumulative flowmeter 1-26 and an instantaneous flowmeter 1-27; a second compressed air conveying channel 1-28 is formed between the air source connecting inner pipe and the air source connecting outer pipe, wherein the high-pressure air source conveying pipe is communicated with the second compressed air conveying channel; the oxygen supply conveying pipe is communicated with the air source connecting inner pipe; the end part of the gas source connecting section at the gas source connecting side is provided with a sight glass 2;
the internal thread section of the air source connecting section is in threaded connection with the external thread connecting part of the iron notch connecting section, the first compressed air conveying channel and the second compressed air conveying channel form a communicated compressed air conveying channel, and the air source connecting inner tube and the iron notch connecting inner tube form a communicated oxygen conveying channel 3.
The invention also discloses a blow-in method based on the oxygen lance, before blow-in, the iron notch connecting section of the oxygen lance is inserted into the iron notch, and the gas outlet is upward;
in the stage of supplying heat to blast furnace hearth by burning coke in the initial stage of blow-on, i.e. within 5 hr of blow-on, the coke is burnt in this stage, so that the oxygen lance is firstly ensured not to burn out, and the oxygen supply with lower flow rate is controlled, and the supply rate is 5m3Per hour, the compressed air supply with a higher flow rate is controlled, and the maximum supply amount is 60m3The air is mainly used for cooling the oxygen lance, avoiding burnout, observing the state of an iron notch through a sight glass at any time, and keeping the front section of the oxygen lance not to be bright; this indicates that the lance front section is not burning.
In the middle stage of furnace opening, i.e. 5-10 hr, at the moment of beginning to gradually produce small amount of slag, the flow rate of oxygen gas should be gradually increased to 8-10m3The flow of the compressed air is kept unchanged, and the flow of the compressed air is adjusted according to the condition of the peep hole; if the inside of the peeping lens is still dark, the flow of air can be properly reduced by 2-3m3And h, continuing to observe the condition in the peep lens, wherein the condition in the peep lens is slightly lightened, the oxygen and compressed air flow can be kept, if the peep lens is bright and the air flow is adjusted to be maximum, the oxygen flow can be properly reduced by 2-3m each time3The oxygen flow rate per hour was observed for about 10 minutes, and the next adjustment was performed.
In the later period of the furnace opening, namely one hour before tapping, the tapping of the front iron notch needs to be carried out in the specified time, and the oxygen flow is opened to the maximum amount of 15-20m3H, simultaneously reducing the flow of the compressed air until the flow of the compressed air is closed to 0, quickly raising the temperature of the iron notch connecting section, and improving the heat of the hearth, wherein the oxygen lance seen from the sight glass isThe slag iron flows out from the iron notch channel until the oxygen lance is burnt out;
the gas source connecting section is used for timely disconnecting the gas source connection part and carrying out tapping operation on the tap hole if the phenomenon of slag iron burning occurs when the generated slag iron meets the total amount requirement of the first tapping in the process of blowing in the furnace; if the condition that the iron slag is burnt out does not occur within the specified time, the oxygen is opened to the maximum value and the compressed air is closed for more than 30min, and the iron slag still does not flow out, the air source connecting section needs to be cut off, and the iron notch needs to be opened, so that the iron slag can flow out in time.
In the whole blow-in process, the flow is adjusted according to the condition of observing the sight glass on site, and the accumulated total amount of the compressed air is 500-700m3The total oxygen amount is 80-150m3。
And (3) comparing experimental effects:
blowing in the traditional blowing method:
in 2012, the furnace is opened for the second time, a sleeper filling method is adopted, and a gas delivery pipe is adopted for blowing at an air supply iron notch. Igniting and blowing air in 4 months and 1 day of 2012, and because the air blowing speed is low in the early stage, the first time of iron is generated within 14 hours, the physical heat is 1477 ℃, the Si content in the iron is 1.07 percent, and dry slag is removed. The speed of the subsequent air opening and air adding is slow, the air volume reaches 6000m3/min after 4 months and 6 days, and the yield reaches 7018t after 4 months and 8 days. The furnace is opened for 8 days, and the normal state is basically recovered.
In 2014, the third blow-in was carried out, a sleeper filling method was adopted, and a gas delivery pipe blowing mode was adopted for an air supply iron notch. And (3) igniting and blowing air in 11-30 days in 2014, discharging the first iron within 20 hours, continuously shrinking the air volume of the held air in the furnace after the first iron is discharged, and finally discharging the iron from a No. 4 iron notch after repeatedly burning the iron notch for a long time, wherein the physical heat is 1380 ℃, the Si content in the iron is 2.07 percent, and the slag is discharged. The subsequent recovery is smooth, the wind volume reaches 6000m3/min in 3 days in 12 months, and the yield reaches 6910t in 5 days in 12 months. The furnace is opened for 5 days, and the normal state is basically recovered.
In 2016, the furnace is opened for the fourth time, a sleeper filling method is adopted, and a gas delivery pipe is adopted for blowing at an air supply iron notch. Igniting and blowing air at 5 months and 17 days in 2016, discharging the first iron after 6.5 hours, wherein the physical heat is 1314 ℃, the Si content in the iron is 0.12 percent, and water slag flows. The air volume reaches 5900m3/min in 19 days in 5 months, but due to equipment problems, the air port distributor leaks water, the air is forced to stop for 2 hours in 20 days in 5 months, the furnace condition is difficult to recover, the pressure difference high air volume cannot be increased, the air volume does not return to 5900m3/min until 22 days in 5 months, the output exceeds 6000t in 23 days in 5 months and reaches 6497t, the output reaches 6920t in 25 days in 5 months, and the air volume basically recovers to a normal state after 9 days in total.
And in 2018, the furnace is opened for the fifth time, a sleeper filling method is adopted, and an air supply iron hole adopts an oxygen lance inserting mode, so that the original blowing mode of a furnace hearth gas guide pipe is replaced. Igniting and blowing air in 2018, 6 months, 26 days, and discharging the first iron after 7 hours, wherein the physical heat is 1250 ℃, the Si content in the iron is 0.17 percent, and water slag flows. And then the furnace condition is difficult to recover, the furnace condition is recovered by changing the whole coke and the blowing-down tuyere at 7-month-4 days and 7-month-6 days respectively, the air quantity returns to the normal production level of 6000m3/min until 7-month-8 days, and the output reaches 6040t/d until 7-month-10 days. The normal production state is basically recovered after the furnace is opened for 14 days.
The method has the advantages that 4 oxygen guns are pre-buried in 4 iron ports before blowing in the 2020, the oxygen guns are used for replacing a gas delivery pipe to blow in the furnace, so that a furnace hearth can be heated, the communication between the iron port area and a tuyere can be maintained, the tapping difficulty of the first tapping of the furnace can be greatly reduced, conditions are created for subsequent air adding and coke reducing ratios, and a large amount of gas is prevented from being sprayed out. However, if the proportion of air and oxygen is not well controlled, the oxygen lance burns out in advance, so that the tuyere area is not ventilated, and the difficulty in tapping is increased. In order to accurately control the proportion of air and oxygen, the novel oxygen lance is used for blowing in the furnace, the original rough operation of only looking at pressure control is replaced, and the oxygen lance is prevented from being burnt in advance. Other parameters of furnace opening: the coke ratio of the whole furnace without the furnace chamber is 2.655kg/t, and the coke ratio of the whole furnace without the furnace chamber is 3.436 kg/t. The coke ratio of the lower part of the normal charge furnace body is 984kg/t, the coke ratio of the middle part of the furnace body is 875kg/t, and the coke ratio of the upper part of the furnace body is 722 kg/tFe. The total iron content is 432t, the total slag content is 433t, and the slag-iron ratio is 1.001. The air coke alkalinity is 0.95, the normal material alkalinity is 1.03, and the whole furnace alkalinity is 1.00; and (3) furnace charge compression ratio: 17% of a coke cleaning section; 15% of empty coke section; and 13-8% of a load section. The blow-in of the oxygen lance is carried out in the blow-in mode, basic conditions are provided for measures such as rapid air adding, oxygen enrichment and silicon reduction in the furnace, the yield is rapidly improved, the yield reaches 8119t in 14 days after 4 months, and the blow-in is completed in 4 days in advance to reach the yield target.
The blowing-in speed in 2020 is compared with the blowing-in speed in 2018 within 34 hours, as shown in figure 2.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. A blast furnace blow-in oxygen lance comprises an oxygen lance body and is characterized in that the oxygen lance body comprises an iron notch connecting section and an air source connecting section, wherein the iron notch connecting section comprises an iron notch connecting inner pipe and an iron notch connecting outer pipe; the iron notch connecting section is inserted into the iron notch section and is provided with a groove, and the other end of the iron notch connecting section is provided with an external thread connecting part;
the gas source connecting section comprises a gas source connecting inner pipe and a gas source connecting outer pipe, and the gas source connecting inner pipe is connected with the gas source connecting outer pipe through a supporting rib; one end of the air source connecting section is provided with an internal thread section matched with the external thread connecting part of the taphole connecting section; the air source connecting section of the air source connecting section is connected with a compressed air conveying pipe and an oxygen supply conveying pipe; the compressed air conveying pipe and the oxygen supply conveying pipe are respectively provided with a set of accumulative flowmeter and instantaneous flowmeter; a second compressed air conveying channel is formed between the air source connecting inner pipe and the air source connecting outer pipe, wherein the high-pressure air source conveying pipe is communicated with the second compressed air conveying channel; the oxygen supply conveying pipe is communicated with the air source connecting inner pipe; the end part of the air source connecting section at the air source connecting side is provided with a peep sight;
the internal thread section of the air source connecting section is in threaded connection with the external thread connecting part of the iron notch connecting section, the first compressed air conveying channel and the second compressed air conveying channel form a communicated compressed air conveying channel, and the air source connecting inner tube and the iron notch connecting inner tube form a communicated oxygen conveying channel.
2. The blow-in method based on the oxygen lance is characterized in that: before opening the furnace, inserting the iron notch connecting section of the oxygen lance into the iron notch, and enabling the air outlet to face upwards;
in the stage of supplying heat to blast furnace hearth by burning coke in the initial stage of blow-on, i.e. within 5 hr of blow-on, the coke is burnt in this stage, so that the oxygen lance is firstly ensured not to burn out, and the oxygen supply with lower flow rate is controlled, and the supply rate is 5m3Per hour, the compressed air supply with a higher flow rate is controlled, and the maximum supply amount is 60m3The air is mainly used for cooling the oxygen lance, avoiding burnout, observing the state of an iron notch through a sight glass at any time, and keeping the front section of the oxygen lance not to be bright; this indicates that the lance front section is not burning.
In the middle stage of furnace opening, i.e. 5-10 hr, at the moment of beginning to gradually produce small amount of slag, the flow rate of oxygen gas should be gradually increased to 8-10m3The flow of the compressed air is kept unchanged, and the flow of the compressed air is adjusted according to the condition of the peep hole; if the inside of the peeping lens is still dark, the flow of air can be properly reduced by 2-3m3And h, continuing to observe the condition in the peep lens, wherein the condition in the peep lens is slightly lightened, the oxygen and compressed air flow can be kept, if the peep lens is bright and the air flow is adjusted to be maximum, the oxygen flow can be properly reduced by 2-3m each time3The oxygen flow rate per hour was observed for about 10 minutes, and the next adjustment was performed.
In the later period of the furnace opening, namely one hour before tapping, the tapping of the front iron notch needs to be carried out in the specified time, and the oxygen flow is opened to the maximum amount of 15-20m3Reducing the flow of the compressed air at the same time until the flow of the compressed air is turned off to 0, rapidly raising the temperature of the iron notch connecting section, improving the heat of a furnace hearth, and enabling an oxygen lance seen from a sight glass to be bright until the oxygen lance is burnt out, and enabling iron slag to flow out of an iron notch channel;
the gas source connecting section is used for timely disconnecting the gas source connection part and carrying out tapping operation on the tap hole if the phenomenon of slag iron burning occurs when the generated slag iron meets the total amount requirement of the first tapping in the process of blowing in the furnace; if the condition that the iron slag is burnt out does not occur within the specified time, the oxygen is opened to the maximum value and the compressed air is closed for more than 30min, and the iron slag still does not flow out, the air source connecting section needs to be cut off, and the iron notch needs to be opened, so that the iron slag can flow out in time.
In the whole blow-in process, the flow is adjusted according to the condition of observing the peep lens on site, and the accumulated usage amount of the compressed air should be 500-700m3The cumulative usage amount of oxygen is 80-150m3。
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| CN114561502A (en) * | 2022-04-11 | 2022-05-31 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Device and method for observing internal working state of blast furnace taphole |
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| CN114561502A (en) * | 2022-04-11 | 2022-05-31 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Device and method for observing internal working state of blast furnace taphole |
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