CN113755664A - Sealing and fire-sealing method for oxygen lance mouth sleeve of fixed smoke hood - Google Patents
Sealing and fire-sealing method for oxygen lance mouth sleeve of fixed smoke hood Download PDFInfo
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- CN113755664A CN113755664A CN202110870827.8A CN202110870827A CN113755664A CN 113755664 A CN113755664 A CN 113755664A CN 202110870827 A CN202110870827 A CN 202110870827A CN 113755664 A CN113755664 A CN 113755664A
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- oxygen lance
- smoke hood
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- 238000007789 sealing Methods 0.000 title claims abstract description 52
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000001301 oxygen Substances 0.000 title claims abstract description 51
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 51
- 239000000779 smoke Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 27
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 28
- 239000010935 stainless steel Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 13
- 239000010439 graphite Substances 0.000 claims abstract description 13
- 238000012856 packing Methods 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 9
- 239000004927 clay Substances 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 45
- 238000003466 welding Methods 0.000 claims description 39
- 239000004570 mortar (masonry) Substances 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 238000009434 installation Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 6
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 3
- 238000004590 computer program Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 230000004927 fusion Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 8
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
-
- 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
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a method for sealing and banking up fire of an oxygen lance port sleeve of a fixed smoke hood, which comprises the following steps of S1: a preparation stage: s11: preparing materials such as dense-arrangement pipes, graphite packing, stainless steel bars, refractory clay and the like required to be used for sealing in advance, and inspecting the materials to ensure that the materials meet the sealing use standard; s12: connecting a power supply of mechanical equipment to be used with an external power supply, starting the mechanical equipment to run, and checking whether each equipment can be normally used; s2: and (5) a stainless steel bar mounting stage. According to the sealing fire-sealing method for the oxygen lance port sleeve of the fixed smoke hood, labyrinth seals are added on the gap surface between the fixed smoke hood and the mounting flange and the gap surface between the oxygen lance port and the mounting flange, and are sealed by filling grouting material, so that the equipment burning loss fault caused by poor sealing effect of the oxygen insulation lance port sleeve is avoided, the waste caused by leakage of recoverable gas is avoided, CO generated by smelting can be collected to the maximum extent, the spare part consumption cost is saved, and the economic benefit of enterprises is improved.
Description
Technical Field
The invention relates to the technical field of use of a fixed smoke hood of a converter in a steel plant, in particular to a method for sealing and banking up fire of an oxygen lance port sleeve of the fixed smoke hood.
Background
Adopt welded fastening usually between the fixed petticoat pipe oxygen muzzle flange panel of converter on the present market and the fixed petticoat pipe, then adopt bolted connection usually between oxygen muzzle and the flange panel, use refractory material to pour between flange panel and the fixed petticoat pipe and lay, fixed petticoat pipe oxygen muzzle position dense row pipe is for folding the line formula, and have the clearance between the flange, again because of considering fixed petticoat pipe operating mode environment, the shrinkage joint can generally be reserved between four curb plates of flange, with guarantee expend with heat and contract with cold service condition, avoid dense row pipe to be heated and lead to the welding seam point to split. However, because a gap exists between the close-packed pipe and the flange panel, the poured pouring material can be gradually pulverized and fall off after being washed by gas for a long time, so that the CO gas in the smoke hood is combined with the atmosphere for combustion, flame overflow is generated, the working condition of the surrounding environment is severe, burning loss is not easy to recover CO gas produced by smelting the converter, energy consumption waste can be caused, equipment is damaged due to long-term burning loss, the long-term use of the equipment is influenced, and the production rhythm and the effective operation rate of the equipment are severely restricted.
Disclosure of Invention
The invention aims to provide a sealing fire-sealing method for an oxygen lance port sleeve of a fixed smoke hood, which aims to solve the problems that a gap exists between a dense-arrangement pipe and a flange panel in the background technology, so that an original poured pouring material can be gradually pulverized and fall off after being washed by gas for a long time, CO gas in the smoke hood is combined with the atmosphere for combustion, flame overflow is generated, burning loss is not easy to recover CO gas generated by smelting a converter, energy consumption waste is caused, equipment damage is caused due to long-term burning loss, and long-term use of the equipment is influenced.
In order to achieve the purpose, the invention provides the following technical scheme: a method for sealing and banking up fire of an oxygen lance port sleeve of a fixed smoke hood comprises the following steps,
s1: a preparation stage:
s11: preparing materials such as dense-arrangement pipes, graphite packing, stainless steel bars, refractory clay and the like required to be used for sealing in advance, and inspecting the materials to ensure that the materials meet the sealing use standard;
s12: connecting a power supply of mechanical equipment (such as electric welding equipment) to be used with an external power supply, starting the mechanical equipment to run, and checking whether each equipment can be normally used;
s2: stainless steel strip installation stage:
s21: carrying out heat treatment on the manufactured fixed smoke hood, and then cutting off the whole size of a panel flange of the fixed smoke hood;
s22: on mounting flange covers the gusset of close-packed tube, install the stainless steel billet additional in proper order, the stainless steel billet takes the short-time welding with close-packed tube gusset to fix, installs additional the order and is successive layer annular and installs additional, installs additional the specific dimensional data of the stainless steel billet that uses as follows: the thickness is 8mm, the length is about 1200mm, and the height is 25 mm;
s3: mounting the fixed flange:
s31: arranging the dense-arrangement pipes at the oxygen lance ports of the fixed smoke hood in a winding flat layer bending mode, and combining and forming flanges at the oxygen lance port installation positions along the periphery of the bent dense-arrangement pipes, wherein the combined and formed flanges are called as fixed flanges;
s32: the height of the fixed flange relative to the dense-arrangement pipe is adjusted, the flange is moved upwards to a position slightly higher than the position of the bent dense-arrangement pipe, the horizontal plane where the flange is located is 15-20 mm higher than the horizontal plane where the bent dense-arrangement pipe is located, and a space is reserved for the dense-arrangement pipe to expand when heated;
s33: connecting a power supply of the electric welding equipment with an external power supply, and then starting the electric welding equipment to weld the flange at the position to complete the installation of the fixed flange;
s4: and (3) fixing the flange:
s41: the fixing flange additionally provided with the stainless steel bars needs to be coated with refractory mortar for pouring, the refractory mortar is uniformly filled, and the fixing flange panel is installed again after the refractory mortar is filled, wherein a short-welding mode is adopted in the earlier stage of the operation, and a full-welding mode is adopted after the refractory mortar is hardened;
s42: steel plates are additionally arranged outside the expansion joints of the side plates on the four sides of the fixed flange, the additionally arranged steel plates can play a role in covering, and a space for the expansion allowance is reserved for the steel plates when the steel plates are additionally arranged, wherein the expansion allowance is 5 mm;
s5: a sealing groove additional installation stage:
s51: a sealing groove is additionally arranged between a flange panel and an oxygen lance port body flange, round steel with the diameter of 8mm is firstly additionally arranged on the surface of a fixed flange to form the sealing groove, and then the round steel with the diameter of 8mm is additionally arranged on the surface of the oxygen lance port flange to form a pressure groove;
s52: selecting a graphite packing with the size of 12mm by 12mm, filling the graphite packing into a sealing groove, and pressing and sealing;
s53: after filling the graphite packing into the sealing groove, filling refractory mortar into the gap between the flange panel and the flange of the oxygen lance port body, wherein the gap allowance is 8-10 mm, and the surface of the flange is coated with the refractory mortar for sealing;
s6: water cooling circulation installation stage:
s61: the outer surface of the flange of the oxygen lance port is manufactured into a water tank according to the size of the flange panel, sufficient cold water is introduced into the water tank through a water injection port of the water tank, a water circulation cooling system is constructed on the basis of the water tank, and the heat of the flange is taken away through the circulation water cooling on the outer surface of the flange of the oxygen lance port, so that the deformation of the flange panel is effectively avoided;
s7: and (3) a trial test stage:
s71: after the equipment is improved, connecting a power supply of the converter with an external power supply, and controlling and starting the converter equipment through a computer program to enable the converter to start smelting work;
s72: after wearing the protective clothing, a detector moves to the position near the oxygen muzzle of the fixed smoke hood, observes and inspects the position, detects whether flame overflow occurs at the position, holds a CO detection device by hand, detects the CO concentration near the fixed smoke hood, and can detect whether CO leakage occurs at the position through the CO detection device;
s73: after the method is detected to be effective, the method is put into practice and applied, and oxygen muzzles of fixed smoke hoods of all converters are improved.
Preferably, the length of the stainless steel strip added in S22 is equal to the length of the flange, and the height of the stainless steel strip is 5mm lower than the height of the flange panel.
Preferably, the short welding in S41 is a welding method of performing intermittent welding by an electric welding device at a contact position of two workpieces to be welded together.
Preferably, the full-length welding in S42 is a welding method in which all the contact areas of two workpieces to be welded are welded by an electric welding device.
Preferably, the specific performance parameters of the refractory mortar in S53 are as follows: al2O3 is more than or equal to 80 percent, Cr2O3 is more than or equal to 1.5 percent, and the refractoriness is more than or equal to 1790 ℃.
Preferably, the water consumption of the water tank in the S61 is 10-15 m3The water flow pressure of the water tank is 0.5MPa, and the water outlet temperature of the water tank is controlled to be not more than 55 ℃.
Compared with the prior art, the invention provides a method for sealing and banking up fire by an oxygen lance port sleeve of a fixed smoke hood, which has the following advantages:
1. according to the invention, labyrinth seals are added on the gap surface between the fixed smoke hood and the mounting flange and the gap surface between the oxygen lance port flange surface and the mounting flange, and the filling grouting material is filled for sealing, so that the equipment burning loss fault caused by poor sealing effect of the oxygen insulation lance port sleeve is avoided, the waste caused by the leakage of the recoverable gas is avoided, the CO generated by smelting is collected to the maximum extent, the spare part consumption cost is saved, and the enterprise economic benefit is improved;
2. by enhancing the sealing, the invention solves the potential safety hazard of coal gas overflow in the operation of the peripheral area of the oxygen lance mouth sleeve, ensures the smooth smelting and the safe operation of peripheral maintenance, greatly enhances the safety of smelting equipment and plays an important role in ensuring the personal safety of workers;
3. the invention avoids the problem of grouting material pulverization and falling off caused by scouring, thoroughly solves the phenomenon of oxygen lance port flaming, and realizes long-period operation with the fixed use period of the smoke hood, thus leading the whole equipment to operate stably.
Drawings
FIG. 1 is a schematic front view of the present invention;
fig. 2 is a schematic view of the installation position of the stainless steel strip according to the present invention.
In the figure: 1. a sealing groove; 2. stainless steel strips; 3. a panel flange; 4. a fixed flange; 5. refractory mortar.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a method for sealing and banking up fire of an oxygen lance port sleeve of a fixed smoke hood comprises the following steps,
s1: a preparation stage:
s11: preparing materials such as dense-arrangement pipes, graphite packing, stainless steel bars 2 and refractory clay 5 which are required to be used for sealing in advance, and inspecting the materials to ensure that the materials meet the sealing use standard;
s12: connecting a power supply of mechanical equipment (such as electric welding equipment) to be used with an external power supply, starting the mechanical equipment to run, and checking whether each equipment can be normally used;
s2: the installation stage of the stainless steel bar 2:
s21: carrying out heat treatment on the manufactured fixed smoke hood, and then cutting off the whole size of the panel flange 3 of the fixed smoke hood;
s22: on 4 gusset that cover the dense row pipe of mounting flange, install stainless steel billet 2 additional in proper order, stainless steel billet 2 takes the weak point with dense row pipe gusset to weld fixedly, installs additional the order and is successive layer annular and installs additional, and concrete mounting means can refer to as shown in fig. 2, installs additional the specific dimensional data of the stainless steel billet 2 who uses as follows: the thickness is 8mm, the length is about 1200mm, and the height is 25 mm;
s3: mounting the fixed flange 4:
s31: arranging the dense-arrangement pipes at the oxygen lance ports of the fixed smoke hood in a winding flat layer bending mode, and combining and forming flanges at the oxygen lance port installation positions along the periphery of the bent dense-arrangement pipes, wherein the combined and formed flanges are called as fixed flanges 4;
s32: the height of the fixed flange 4 relative to the dense arrangement pipe is adjusted, the flange is moved upwards to a position slightly higher than the position of the bent dense arrangement pipe, the horizontal plane where the flange is located is 15-20 mm higher than the horizontal plane where the bent dense arrangement pipe is located, and a space is reserved for the dense arrangement pipe to expand when heated;
s33: connecting a power supply of the electric welding equipment with an external power supply, and then starting the electric welding equipment to weld the flange at the position to complete the installation of the fixed flange 4;
s4: and (3) a fixing flange 4 reinforcing stage:
s41: the fixing flange 4 additionally provided with the stainless steel bars 2 needs to be coated with refractory mortar 5 for pouring, the refractory mortar 5 is uniformly filled, the filling position of the refractory mortar 5 is shown in figure 1, the fixing flange 4 panel is installed again after filling, the short-time welding mode is adopted in the earlier stage of the operation, and the full-time welding mode is adopted after the refractory mortar 5 is hardened;
s42: steel plates are additionally arranged at the expansion joints of the side plates on the periphery of the fixed flange 4, the additionally arranged steel plates can play a role of covering, and a space for the steel plates to keep the expansion allowance is required when the steel plates are additionally arranged, and the expansion allowance is 5 mm;
s5: the stage of additionally installing the sealing groove 1:
s51: a sealing groove 1 is additionally arranged between a flange panel and an oxygen lance port body flange, round steel with the diameter of 8mm is firstly additionally arranged on the surface of a fixed flange 4 to form the sealing groove 1, and then round steel with the diameter of 8mm is additionally arranged on the surface of the oxygen lance port flange to form a pressure groove;
s52: selecting a graphite packing with the size of 12mm by 12mm, filling the graphite packing into the sealing groove 1, and pressing and sealing;
s53: after filling the graphite packing into the seal groove 1, the clearance allowance between the flange panel and the flange of the oxygen lance port body is 8-10 mm, filling refractory mortar 5 into the clearance between the two flanges, and smearing the refractory mortar 5 on the flange surface for sealing;
s6: water cooling circulation installation stage:
s61: the outer surface of the flange of the oxygen lance port is manufactured into a water tank according to the size of the flange panel, sufficient cold water is introduced into the water tank through a water injection port of the water tank, a water circulation cooling system is constructed on the basis of the water tank, and the heat of the flange is taken away through the circulation water cooling on the outer surface of the flange of the oxygen lance port, so that the deformation of the flange panel is effectively avoided;
s7: and (3) a trial test stage:
s71: after the equipment is improved, connecting a power supply of the converter with an external power supply, and controlling and starting the converter equipment through a computer program to enable the converter to start smelting work;
s72: after wearing the protective clothing, a detector moves to the position near the oxygen muzzle of the fixed smoke hood, observes and inspects the position, detects whether flame overflow occurs at the position, holds a CO detection device by hand, detects the CO concentration near the fixed smoke hood, and can detect whether CO leakage occurs at the position through the CO detection device;
s73: after the method is detected to be effective, the method is put into practice and applied, and oxygen muzzles of fixed smoke hoods of all converters are improved.
The adding length of the stainless steel strip 2 in the S22 is equal to the length of the flange, and the height of the stainless steel strip 2 is 5mm lower than the height of the flange panel;
the short welding in the S41 is a welding method of performing intermittent fusion welding on the contact position of two workpieces to be welded together by electric welding equipment;
the full welding in S42 is a welding method in which all the contact places of two workpieces to be welded together are fusion-welded by electric welding equipment;
the concrete performance parameters of the refractory mortar 5 in the S53 are as follows: al2O3 is more than or equal to 80 percent, Cr2O3 is more than or equal to 1.5 percent, and the refractoriness is more than or equal to 1790 ℃;
the water consumption of the water tank in S61 is 10-15 m3The water flow pressure of the water tank is 0.5MPa, and the water outlet temperature of the water tank is controlled to be not more than 55 ℃.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for sealing and banking up fire of an oxygen lance port sleeve of a fixed smoke hood comprises the following steps, and is characterized in that:
s1: a preparation stage:
s11: preparing materials such as dense-arrangement pipes, graphite packing, stainless steel bars, refractory clay and the like required to be used for sealing in advance, and inspecting the materials to ensure that the materials meet the sealing use standard;
s12: connecting a power supply of mechanical equipment (such as electric welding equipment) to be used with an external power supply, starting the mechanical equipment to run, and checking whether each equipment can be normally used;
s2: stainless steel strip installation stage:
s21: carrying out heat treatment on the manufactured fixed smoke hood, and then cutting off the whole size of a panel flange of the fixed smoke hood;
s22: on mounting flange covers the gusset of close-packed tube, install the stainless steel billet additional in proper order, the stainless steel billet takes the short-time welding with close-packed tube gusset to fix, installs additional the order and is successive layer annular and installs additional, installs additional the specific dimensional data of the stainless steel billet that uses as follows: the thickness is 8mm, the length is about 1200mm, and the height is 25 mm;
s3: mounting the fixed flange:
s31: arranging the dense-arrangement pipes at the oxygen lance ports of the fixed smoke hood in a winding flat layer bending mode, and combining and forming flanges at the oxygen lance port installation positions along the periphery of the bent dense-arrangement pipes, wherein the combined and formed flanges are called as fixed flanges;
s32: the height of the fixed flange relative to the dense-arrangement pipe is adjusted, the flange is moved upwards to a position slightly higher than the position of the bent dense-arrangement pipe, the horizontal plane where the flange is located is 15-20 mm higher than the horizontal plane where the bent dense-arrangement pipe is located, and a space is reserved for the dense-arrangement pipe to expand when heated;
s33: connecting a power supply of the electric welding equipment with an external power supply, and then starting the electric welding equipment to weld the flange at the position to complete the installation of the fixed flange;
s4: and (3) fixing the flange:
s41: the fixing flange additionally provided with the stainless steel bars needs to be coated with refractory mortar for pouring, the refractory mortar is uniformly filled, and the fixing flange panel is installed again after the refractory mortar is filled, wherein a short-welding mode is adopted in the earlier stage of the operation, and a full-welding mode is adopted after the refractory mortar is hardened;
s42: steel plates are additionally arranged outside the expansion joints of the side plates on the four sides of the fixed flange, the additionally arranged steel plates can play a role in covering, and a space for the expansion allowance is reserved for the steel plates when the steel plates are additionally arranged, wherein the expansion allowance is 5 mm;
s5: a sealing groove additional installation stage:
s51: a sealing groove is additionally arranged between a flange panel and an oxygen lance port body flange, round steel with the diameter of 8mm is firstly additionally arranged on the surface of a fixed flange to form the sealing groove, and then the round steel with the diameter of 8mm is additionally arranged on the surface of the oxygen lance port flange to form a pressure groove;
s52: selecting a graphite packing with the size of 12mm by 12mm, filling the graphite packing into a sealing groove, and pressing and sealing;
s53: after filling the graphite packing into the sealing groove, filling refractory mortar into the gap between the flange panel and the flange of the oxygen lance port body, wherein the gap allowance is 8-10 mm, and the surface of the flange is coated with the refractory mortar for sealing;
s6: water cooling circulation installation stage:
s61: the outer surface of the flange of the oxygen lance port is manufactured into a water tank according to the size of the flange panel, sufficient cold water is introduced into the water tank through a water injection port of the water tank, a water circulation cooling system is constructed on the basis of the water tank, and the heat of the flange is taken away through the circulation water cooling on the outer surface of the flange of the oxygen lance port, so that the deformation of the flange panel is effectively avoided;
s7: and (3) a trial test stage:
s71: after the equipment is improved, connecting a power supply of the converter with an external power supply, and controlling and starting the converter equipment through a computer program to enable the converter to start smelting work;
s72: after wearing the protective clothing, a detector moves to the position near the oxygen muzzle of the fixed smoke hood, observes and inspects the position, detects whether flame overflow occurs at the position, holds a CO detection device by hand, detects the CO concentration near the fixed smoke hood, and can detect whether CO leakage occurs at the position through the CO detection device;
s73: after the method is detected to be effective, the method is put into practice and applied, and oxygen muzzles of fixed smoke hoods of all converters are improved.
2. The method for sealing and banking up a fire of the oxygen lance opening sleeve with the fixed smoke hood is characterized in that: the length of the stainless steel strips in the S22 is equal to the length of the flange, and the height of the stainless steel strips is 5mm lower than that of the flange panel.
3. The method for sealing and banking up a fire of the oxygen lance opening sleeve with the fixed smoke hood is characterized in that: the short welding in S41 is a welding method of performing intermittent fusion welding at a contact position of two workpieces to be welded together by an electric welding apparatus.
4. The method for sealing and banking up a fire of the oxygen lance opening sleeve with the fixed smoke hood is characterized in that: the full-length welding in S42 is a welding method in which all the contact portions of two workpieces to be welded are welded by an electric welding apparatus.
5. The method for sealing and banking up a fire of the oxygen lance opening sleeve with the fixed smoke hood is characterized in that: the concrete performance parameters of the refractory mortar in the S53 are as follows: al2O3 is more than or equal to 80 percent, Cr2O3 is more than or equal to 1.5 percent, and the refractoriness is more than or equal to 1790 ℃.
6. The method for sealing and banking up a fire of the oxygen lance opening sleeve with the fixed smoke hood is characterized in that: the water consumption of the water tank in the S61 is 10-15 m3The water flow pressure of the water tank is 0.5MPa, and the water outlet temperature of the water tank is controlled to be not more than 55 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110870827.8A CN113755664A (en) | 2021-07-30 | 2021-07-30 | Sealing and fire-sealing method for oxygen lance mouth sleeve of fixed smoke hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110870827.8A CN113755664A (en) | 2021-07-30 | 2021-07-30 | Sealing and fire-sealing method for oxygen lance mouth sleeve of fixed smoke hood |
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| Publication Number | Publication Date |
|---|---|
| CN113755664A true CN113755664A (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110870827.8A Pending CN113755664A (en) | 2021-07-30 | 2021-07-30 | Sealing and fire-sealing method for oxygen lance mouth sleeve of fixed smoke hood |
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| Country | Link |
|---|---|
| CN (1) | CN113755664A (en) |
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| US4688772A (en) * | 1985-05-09 | 1987-08-25 | Nippon Steel Corporation | Apparatus for sealing the skirt of a converter waste gas recovery system |
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| CN211311508U (en) * | 2019-12-30 | 2020-08-21 | 中天钢铁集团有限公司 | Oxygen lance mouth cooling device |
| CN112226577A (en) * | 2020-11-03 | 2021-01-15 | 北京京诚科林环保科技有限公司 | A guide structure and insert barrel subassembly for barrel is inserted in installation |
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2021
- 2021-07-30 CN CN202110870827.8A patent/CN113755664A/en active Pending
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| US4688772A (en) * | 1985-05-09 | 1987-08-25 | Nippon Steel Corporation | Apparatus for sealing the skirt of a converter waste gas recovery system |
| CN1876851A (en) * | 2006-06-30 | 2006-12-13 | 江阴海陆冶金设备制造有限公司 | Mouth fixed section flue of gasification cooling flue for steel-making converter |
| CN101205566A (en) * | 2007-12-05 | 2008-06-25 | 中冶京诚工程技术有限公司 | Movable hood mechanical seal for converter vapourization cooling system |
| CN201660658U (en) * | 2010-04-16 | 2010-12-01 | 中冶赛迪工程技术股份有限公司 | Oxygen lance nitrogen sealing device |
| CN211311508U (en) * | 2019-12-30 | 2020-08-21 | 中天钢铁集团有限公司 | Oxygen lance mouth cooling device |
| CN112226577A (en) * | 2020-11-03 | 2021-01-15 | 北京京诚科林环保科技有限公司 | A guide structure and insert barrel subassembly for barrel is inserted in installation |
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Application publication date: 20211207 |
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