CN114231689B - Pressing device, test device and test method for converter movable furnace bottom filling material - Google Patents

Pressing device, test device and test method for converter movable furnace bottom filling material Download PDF

Info

Publication number
CN114231689B
CN114231689B CN202111582925.8A CN202111582925A CN114231689B CN 114231689 B CN114231689 B CN 114231689B CN 202111582925 A CN202111582925 A CN 202111582925A CN 114231689 B CN114231689 B CN 114231689B
Authority
CN
China
Prior art keywords
furnace
arc
slurry
furnace body
shaped
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111582925.8A
Other languages
Chinese (zh)
Other versions
CN114231689A (en
Inventor
吕仁祥
张蓓
刘在春
李庆涛
纪怀杰
刘吉良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jinan Ludong Refractory Material Co ltd
Original Assignee
Jinan Ludong Refractory Material Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jinan Ludong Refractory Material Co ltd filed Critical Jinan Ludong Refractory Material Co ltd
Priority to CN202111582925.8A priority Critical patent/CN114231689B/en
Publication of CN114231689A publication Critical patent/CN114231689A/en
Application granted granted Critical
Publication of CN114231689B publication Critical patent/CN114231689B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings
    • C21C5/441—Equipment used for making or repairing linings
    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a pressing-in device, a testing device and a testing method for a converter movable furnace bottom filling material, which comprise a control cabinet, a double-layer stirrer, a special pressing-in pump, a flow divider, a slurry conveying pipe and a vertical arc-shaped electric heating furnace, wherein the vertical arc-shaped electric heating furnace comprises a furnace body, a furnace inner heating component and a furnace cover, the furnace cover is firmly fixed on the furnace body, an arc-shaped gap is formed between the furnace cover and the furnace body, the double-layer stirrer is connected with the special pressing-in pump through a guide pipe, the special pressing-in pump is connected with a slurry injection pipe on a U-shaped groove through the slurry conveying pipe, and then the testing is carried out step by step, so that the proportion of the filling material can be mastered more accurately, the adaptability of equipment and a construction flow can be tested, the feasibility of site construction is verified, the quality assurance of the construction process is confirmed, the correct arrangement is conveniently made for site construction safety is ensured.

Description

Pressing device, test device and test method for converter movable furnace bottom filling material
Technical Field
The invention relates to the field of a converter filler pressing-in test device, in particular to a pressing-in device, a test device and a test method for a converter movable furnace bottom filler.
Background
With the improvement of the steel smelting technology in China, the bottom blowing oxygen and powder spraying smelting mode of the converter is gradually valued by steel enterprises, the oxygen bottom blowing converter converting method can ensure that the stirring intensity of a molten pool is intense, oxygen flows are uniformly dispersed and blown into the molten pool, the influence of an upper slag layer on the reaction in the furnace is less, and the unexpected excellent smelting characteristics such as smelting effect can be obtained by spraying iron ore powder or returning a mixture of slag and lime powder through the bottom of the converter. But the service life of the furnace bottom refractory is reduced, the furnace bottom refractory needs to be replaced in a hot state in the smelting process in order to improve the utilization rate of the furnace bottom refractory and the steelmaking efficiency, and the furnace body of the converter is also designed into a movable furnace bottom structure mode capable of being quickly disassembled and replaced.
In the corresponding converter bottom thermal replacement process, the annular gap formed by the movable furnace bottom refractory material and the furnace body refractory material after replacement is formed, in the plugging process of the annular gap, the quality of the filling material and the construction flow are key points related to converter bottom replacement, at present, workers gradually grope, master and verify the proportion of the filling material in a real construction environment, the smoothness of the construction flow is improved, the feasibility of construction is verified, but the operation of the converter is unstable, a certain danger exists, and the problem to be solved in the prior art is solved.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides a test device and a test method for a converter movable furnace bottom filler, which simulate a real construction environment through an arc furnace body and a furnace cover, have reasonable structure and cost saving, and can perform tests for many times in a short time so as to solve the problems in the prior art.
The invention is realized by the following technical scheme:
the utility model provides a test device of converter activity stove bottom filler, includes switch board, double-deck mixer, special pump, shunt, mud conveyer pipe and vertical arc electric heater, vertical arc electric heater includes furnace body, stove internal heating subassembly and bell, the furnace body is vertical curved steel box shell, and the concave side of furnace body has seted up curved stove groove, has pasted glass fiber insulation material on the stove cell wall, has built the aluminium silicate fiberboard in the stove groove, has still built an arc recess form furnace on the aluminium silicate fiberboard, the furnace tank bottom has built high aluminium matter resistant firebrick, the outer facade of high aluminium matter resistant firebrick is parallel and level with the outer facade of furnace body lower limb, and the upper portion of high aluminium matter resistant firebrick forms an arc mesa, the last vertical magnesia carbon brick of building of arc mesa, the upper edge of magnesia carbon brick is close to the glass fiber insulation material of stove groove upper wall, seals the furnace completely, and the outer facade of magnesia carbon brick is parallel and level with the outer facade of high aluminium matter resistant firebrick; the heating assembly in the furnace comprises a heating plate and 3 thermocouples, wherein the heating plate is arranged on the wall of the furnace chamber, one of the 3 thermocouples is arranged on the heating plate, the other thermocouple is arranged at the bottom of the heating plate, and the other thermocouple is arranged on an aluminum silicate fiber board below the furnace chamber; the furnace cover is a vertical arc-shaped steel furnace cover and comprises an arc-shaped plate and a reinforcing member fixed on the concave surface of the arc-shaped plate, U-shaped grooves are welded at the left end and the right end of the convex surface of the arc-shaped plate and the bottom of the arc-shaped plate, graphite packing is arranged on the outer side wall of each U-shaped groove, a slurry injection pipe is arranged in the middle of each U-shaped groove at the bottom of the arc-shaped plate, and a cut-off valve is arranged on each slurry injection pipe.
Further optimally, the double-layer stirrer is divided into an upper layer and a lower layer which can run simultaneously, a closeable discharging hole is formed in the bottom of the upper layer of the double-layer stirrer, a discharging hole is formed in the lower layer of the double-layer stirrer, and an anti-blocking filter valve is arranged on the discharging hole.
Further optimally, the diverter is provided with a feed inlet and a plurality of discharge outlets, and the discharge outlets are provided with cut-off regulating valves.
Further optimally, quick connectors are arranged at two ends of the slurry conveying pipe.
Further optimally, two sides of the furnace body are respectively hinged with 2 rotatable threaded handwheels, 1 stable nail is respectively fixed on the two sides of the arc plate, and 2 thread grooves and 1 stable nail hole are respectively fixed on the two sides of the arc plate.
Further preferably, the furnace cover is fixed with the furnace body through a threaded hand wheel, a threaded groove, a stable nail and a stable nail hole, and an arc-shaped gap is formed between the furnace cover and the furnace body.
Further preferably, the control cabinet is provided with a control system of a heating component, and the heating component passes through the glass fiber heat insulation material and the outer wall of the furnace body through a wire to be electrically connected with the control cabinet.
Further preferably, the double-layer stirrer is connected with a special pressing-in pump through a guide pipe, the special pressing-in pump is connected with a feeding hole of the flow divider through a mud conveying pipe, and a discharging hole on the flow divider is connected with a mud injection pipe on the U-shaped groove through the mud conveying pipe.
Further optimally, the following steps are carried out by a test device of the converter live hearth filling material during the test: a, preparing, namely coating a layer of refractory thinner on the outer vertical surfaces of magnesia carbon bricks and high-alumina refractory bricks, coating a layer of refractory thinner on the convex surface of a furnace cover, airing, and pasting a layer of refractory heat-insulating glass wool with the thickness of 50mm on the upper edge of the furnace cover; b willThe furnace cover is closed on the furnace body, the steady nail passes through the steady nail hole, the threaded hand wheel is closed on the threaded groove, the threaded hand wheel is rotated to fix the furnace cover and the furnace body firmly, an arc gap is formed between the furnace cover and the furnace body, then the double-layer stirrer is connected with a special pressing-in pump through a guide pipe, the special pressing-in pump is connected with a feed inlet of the flow divider through a mud conveying pipe, and a discharge outlet of the flow divider is connected with a mud injection pipe on the U-shaped groove through the mud conveying pipe; c, starting a power supply of a control cabinet, setting a temperature value, heating a furnace body by a heating sheet in a hearth, keeping constant temperature when the temperature in the furnace body reaches the set value, adding a furnace bottom filling material into a double-layer stirrer, and mixing slurry; d, dismantling the refractory heat-insulating glass wool in the step A, then starting to work by a special pressing pump, injecting the mixed slurry into the arc-shaped gap through a flow divider and a slurry injection pipe, observing the upper opening of the arc-shaped gap between the furnace body and the furnace cover until the slurry is full of the arc-shaped gap, closing the special pressing pump, closing a cut-off valve of the slurry injection pipe, disconnecting the slurry conveying pipe, and stopping heating of the heating plate; e waiting for the furnace body to naturally cool to room temperature, then opening the furnace cover to check the test result, wherein the strength of the solidified slurry is not lower than 10MPa and the volume density is not lower than 1.8g/cm 3 And the slurry is uniformly distributed, thus the test is successful.
The invention further optimally provides a pressing device for the converter movable furnace bottom filling material, which comprises a double-layer stirrer, a special pressing pump, a flow divider and slurry conveying pipes, wherein 1 feed inlet and 4-12 discharge outlets are arranged on the flow divider, the discharge outlets are all provided with cut-off regulating valves, the double-layer stirrer is connected with the special pressing pump through a guide pipe, the special pressing pump is connected with the feed inlets of the flow divider through the slurry conveying pipes, and each discharge outlet on the flow divider is also connected with the slurry conveying pipe.
The beneficial effects of the invention are as follows:
1) The test device has reasonable structure, saves cost, simulates the actual circular converter and the furnace body through the arc-shaped furnace body and the furnace cover, simulates the annular gap formed between the arc-shaped gaps formed between the arc-shaped furnace body and the furnace cover, ensures that the test environment is basically similar to the actual construction environment, and ensures the accuracy and the stability of the test process.
2) The test device comprises a control cabinet, a double-layer stirrer, a special pressing pump, a shunt and a vertical arc-shaped electric heating furnace, wherein the control cabinet controls the temperature of the heating furnace, the double-layer stirrer continuously provides filler slurry for the heating furnace, the special pressing pump presses the slurry mixed by the double-layer stirrer into a heating furnace body through the shunt, the jacking seam test is carried out under different temperature environments, the proportion of filler (namely refractory particles with different particle diameters, fine powder and organic solvent) can be more accurately mastered, the adaptability of equipment and construction flow can be tested, the feasibility of site construction is verified, the quality assurance of the construction process is confirmed, so that the correct arrangement is made for site construction, and the construction safety is ensured.
3) The invention also provides a furnace bottom filling material pressing device in actual furnace bottom hot replacement, when the converter bottom is actually replaced, the furnace bottom is provided with a plurality of slurry injection pipes, and a plurality of discharge ports on the flow divider can be respectively connected with one slurry injection pipe through a plurality of slurry conveying pipes for injection simultaneously. The flow divider can also adjust the mud flow of each mud conveying pipe, and can make mud injection more uniform according to the mud injection condition in the annular gap of the furnace bottom; if the blocking or the failure occurs, the two ends of each mud conveying pipe are respectively provided with a quick connector, and the cut-off valve and the cut-off regulating valve can be closed at any time to quickly replace.
Drawings
FIG. 1 is an overall schematic view of the test apparatus
Fig. 2 is a schematic diagram of the furnace body structure of the neutral arc electric heating furnace in the test device.
FIG. 3 is a schematic view of the furnace body of the test apparatus after laying magnesia carbon bricks
FIG. 4 is a schematic diagram showing the structure of a furnace cover of a vertical arc-shaped electric heating furnace in the test apparatus
FIG. 5 is a schematic view showing the structure of a furnace cover stuck with a fireproof heat-insulating glass wool before heating a heating furnace in the test apparatus
FIG. 6 is a schematic view showing the structure of an arc-shaped gap between a furnace body and a furnace cover in the test apparatus
FIG. 7 is a schematic view showing the connection of the press-fitting device to the converter in the actual replacement of the converter bottom according to the present invention
In the figure, 1, a furnace body; 2. a furnace cover; 21. a double-layer stirrer; 211. an anti-blocking filter valve; 22. a dedicated press-in pump; 23. a shunt; 231. cutting off the regulating valve; 232. a slurry delivery pipe; 24. a control cabinet; 25. a converter;
3. a furnace tank; 4. a furnace; 5. aluminum silicate fiber board; 6. a glass fiber thermal insulation material; 7. high alumina refractory bricks; 71. an arc-shaped table top; 8. a heating sheet; 9. a thermocouple; 10. an arc-shaped plate; 11. a reinforcement; 12. a U-shaped groove; 13. graphite packing; 14. a slurry injection pipe; 141. a shut-off valve; 151. a threaded hand wheel; 152. a thread groove; 161. stabilizing nails; 162. a nail stabilizing hole; 171. a base; 172. a universal wheel; 18. magnesia carbon bricks; 19. fire-resistant heat-insulating glass wool; 20. an arc-shaped slit.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings. In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "left", "right", "front", "rear", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1:
as shown in figures 1-6, a test device for a converter movable furnace bottom filler comprises a control cabinet 24, a double-layer stirrer 21, a special pressing pump 22, a flow divider 23, a slurry conveying pipe and a vertical arc-shaped electric heating furnace, wherein the vertical arc-shaped electric heating furnace comprises a furnace body 1, a furnace inner heating component and a furnace cover 2, the furnace body 1 is a vertical arc-shaped steel box shell, an arc-shaped furnace groove 3 is formed in the concave side of the furnace body 1, a glass fiber heat insulation material 6 is stuck on the furnace groove wall, an aluminum silicate fiber plate 5 is built in the furnace groove 3, an arc-shaped groove-shaped hearth 4 is also built on the aluminum silicate fiber plate, the outer elevation of the high-alumina refractory brick 7 is flush with the outer elevation of the lower edge of the furnace body 1, an arc-shaped table 71 is formed on the upper part of the high-alumina refractory brick 7, a magnesia carbon brick 18 is tightly attached to the furnace body 18 after being built, a gap between the two bricks is smaller than 0.5mm, the upper edge of the magnesia carbon brick 18 is tightly attached to the upper edge of the furnace groove 3, the upper edge of the furnace groove 3 is tightly attached to the magnesia carbon brick 18, and the outer elevation of the furnace body is completely flush with the outer elevation of the high-alumina brick 4, and the vertical furnace body is completely sealed by the high alumina brick 7 is a high-alumina brick 1, the high-alumina brick is completely flush with the upper elevation surface 1, and the upper surface is completely sealed, and has a high alumina brick is completely sealed, and has a high alumina refractory brick;
the heating assembly in the furnace comprises heating plates 8 and 3 thermocouples 9, wherein the heating plates 3 are arranged in three rows and are arranged on the wall of the hearth 4, one end of each row of heating plates is powered by a single line of a 380V three-phase line respectively, the other ends of the heating plates are connected in series, one of the 3 thermocouples 9 is arranged on the heating plates 8, the other thermocouple is arranged at the bottom of the heating plate 8, and the other thermocouple is arranged on an aluminum silicate fiber board 5 below the hearth 4;
the furnace cover 2 is a vertical arc-shaped steel furnace cover and comprises an arc-shaped plate 10 and a reinforcing member 11 fixed on the concave surface of the arc-shaped plate, U-shaped grooves 12 are welded at the left end and the right end of the convex surface of the arc-shaped plate 10 and the bottom, graphite packing 13 is arranged on the outer side wall of each U-shaped groove 12 and plays a role in sealing, a slurry injection pipe 14 is arranged in the middle of each U-shaped groove 12 at the bottom of the arc-shaped plate 10, and a cut-off valve 141 is arranged on each slurry injection pipe. It should be noted here that in the actual production environment, the shut-off valve on the slurry delivery pipe of the converter is detachable, the slurry injection is completed, the slurry delivery pipe is disconnected, the shut-off valve 141 is closed, and the shut-off valve can be detached after the slurry is solidified after cooling and solidifying the slurry.
As a preferred embodiment, the filler comprises refractory material particles with different particle sizes, fine powder and an organic solvent, the double-layer stirrer 21 is used for stirring and mixing the filler into slurry, the double-layer stirrer 21 is divided into an upper layer and a lower layer which can run simultaneously, a closable discharging hole is formed in the bottom of the upper layer of the double-layer stirrer 21, a discharging hole is formed in the lower layer of the double-layer stirrer, and an anti-blocking filter valve is arranged on the discharging hole. The upper layer of the double-layer stirring barrel is primary slurry stirring, the lower layer of the double-layer stirring barrel is secondary slurry stirring and storage, after the upper layer stirring is completed, the discharging hole is opened, slurry enters the lower layer, the lower layer is continuously stirred and is waited for use, the upper layer is continuously put into the filling material for stirring, uninterrupted slurry supply can be realized through repeating the process, and the anti-blocking filter valve prevents blockage of a pipeline caused by uneven stirring.
As a preferred embodiment, the diverter 23 is provided with a feed inlet and a plurality of discharge ports, the discharge ports are generally provided with 4 to 12 discharge ports, the discharge ports are all provided with adjusting shut-off valves 231, ball valves are generally used, the size can be adjusted and circulation can be closed, and it is noted here that when the vertical arc heating furnace is used for press-in test, only one slurry conveying pipe is needed for connection, and other discharge ports are closed by the shut-off adjusting valves. When the converter bottom is actually replaced, a plurality of slurry injection pipes are arranged at the converter bottom, and the discharge holes on the flow divider can be respectively connected with one slurry injection pipe through the plurality of slurry conveying pipes for injection.
As a preferred embodiment, both ends of the slurry conveying pipe are respectively provided with a quick connector, so that the quick connector is conveniently connected with the cut-off adjusting valve 231 on the diverter and the cut-off valve 141 on the slurry injection pipe, and quick connection and replacement are realized. Preferably, the special pressing-in pump and the diverter between the slurry conveying pipe length 10-30 m, the diverter and the slurry injection pipe between the slurry conveying pipe length 1-6 m.
As a preferred embodiment, two sides of the furnace body 1 are respectively hinged with 2 rotatable threaded handwheels 151, 1 stabilizing nail 161 is also respectively fixed, two sides of the arc plate are respectively fixed with 2 threaded grooves 152 and 1 stabilizing nail hole 162, the furnace cover 3 is fixed with the furnace body 1 through the threaded handwheels 151 and the threaded grooves 152, the stabilizing nails 161 and the stabilizing nail holes 162, an arc-shaped gap 20 is formed between the furnace cover and the furnace body, the arc-shaped gap is used for simulating an annular gap between the furnace bottom and the furnace body in an actual production environment, the width of the U-shaped groove 12 is 50mm, and therefore, the width of the arc-shaped gap is also 50mm.
As a preferred implementation mode, the bottom of the furnace body 1 is fixedly provided with 4 rows of steel column bases 171, and the bottom of the furnace cover is provided with 4 groups of universal wheels 172, so that the furnace cover is convenient to move and is convenient to assemble and fix with the furnace body.
As a preferred embodiment, the control cabinet 24 is provided with a control system of a heating assembly, the heating assembly is controlled by the control cabinet to heat the furnace body, and the heating assembly passes through the glass fiber thermal insulation material 6 and the outer wall of the furnace body 1 through a wire to be electrically connected with the control cabinet.
As a preferred embodiment, as shown in fig. 1, the double-layer stirrer 21 is connected with the special pressing pump 22 through a PVC transparent steel wire plastic pipe, the maximum working pressure of the special pressing pump 22 adopted in this example is 8MPa, and in test, the special pressing pump 22 is connected with the diverter through a slurry conveying pipe (high-pressure steel wire braided rubber pipe), and a discharge port on the diverter 23 is connected with the slurry injection pipe 14 on the U-shaped groove through a slurry conveying pipe 232.
In a preferred embodiment, the following steps are performed by a test apparatus for a converter live hearth packing during the test:
a, preparing, namely coating a layer of refractory thinner on the outer vertical surfaces of magnesia carbon bricks 18 and high-alumina refractory bricks 7, coating a layer of refractory thinner on the convex surface of a furnace cover 2, airing, and pasting a layer of refractory heat-insulating glass wool 19 with the thickness of 50mm on the upper edge of the furnace cover, wherein the refractory thinner is formed by mixing an organic solvent and magnesia fine powder, the effect is to clean filler slurry solidified in the subsequent process, the effect of the refractory heat-insulating glass wool is to shield an arc gap above a heating furnace, so that the heating heat is prevented from being lost, and the temperature is slowly increased;
the furnace cover 2 is combined with the furnace body 1, the stabilizing nails 161 penetrate through the stabilizing nail holes 162, the threaded hand wheels 151 are combined with the threaded grooves 152, the furnace cover and the furnace body are fixed firmly by rotating the threaded hand wheels, an arc-shaped gap is formed between the furnace cover and the furnace body, then the double-layer stirrer 21 is connected with the special pressing-in pump 22 through a guide pipe, the special pressing-in pump is connected with a feed inlet of the flow divider through a mud conveying pipe, and a discharge outlet of the flow divider is connected with a mud injection pipe on the U-shaped groove through a mud conveying pipe;
c, starting a power supply of a control cabinet 24, setting a test temperature value, heating a furnace body by a heating sheet in a hearth, keeping constant temperature when the temperature in the furnace body reaches a set value, adding a furnace bottom filling material into a double-layer stirrer 21, and mixing slurry;
d, dismantling the fireproof heat-insulating glass wool 19 in the step A, then starting to work by a special pressing pump 22, injecting the mixed slurry into the arc-shaped gap through a diverter and a slurry injection pipe 14, observing the upper opening of the arc-shaped gap between the furnace body and the furnace cover until the slurry is full of the arc-shaped gap, closing the special pressing pump, closing a cutting valve of the slurry injection pipe, disconnecting the slurry delivery pipe, and stopping heating of the heating plate;
e waiting for the furnace body to naturally cool to room temperature, then opening a furnace cover to check the test result, detecting the strength of the solidified filler slurry, and if the strength of the solidified slurry is not lower than 10MPa and the volume density is not lower than 1.8g/cm 3 And if the slurry distribution is uniform, the test is qualified, otherwise, the test result is unqualified.
The test device has reasonable structure, saves cost, simulates the actual circular converter and the furnace body through the arc-shaped furnace body and the furnace cover, simulates the annular gap formed between the arc-shaped gaps formed between the arc-shaped furnace body and the furnace cover, ensures that the test environment is basically similar to the actual construction environment, and ensures the accuracy and the stability of the test process.
Through the liftout seam test under different temperature environment, the proportion of the filler (namely refractory particles, fine powder and organic solvent with different particle diameters) can be mastered more accurately, the adaptability of equipment and construction flow can be tested, the feasibility of site construction is verified, the quality assurance of the construction process is confirmed, so that the correct arrangement is made for site construction, and the construction safety is ensured
Example 2:
the length of the heat exchange masonry construction time of the converter bottom in the actual production environment is different, the old converter bottom is required to be disassembled firstly, then the new converter bottom is combined with the converter body, at the moment, the temperature in the annular gap formed by the converter bottom and the converter body is different, the temperature in the annular gap is expected to be about 200-800 ℃, therefore, 3 temperatures can be set for the same filling material to test in the test of the company,
1. the replacement time of the converter bottom in the site is longer, and the temperature in the annular gap in the converter is predicted to be about 200 ℃ after the construction is completed;
2. the replacement time of the converter bottom in the site is basically normal, and the internal annular gap of the converter is predicted to be about 400 ℃ after the construction is completed;
3. the on-site converter bottom replacement time is shorter, the construction speed is faster, and the temperature in the annular gap in the converter is predicted to be about 600 ℃ after the construction is completed.
The method for testing and implementing the condition that the temperature in the annular gap in the converter is estimated to be about 200 ℃ after the construction is completed is as follows:
coating a layer of fire-resistant thinner material on the concave surface of the magnesia carbon brick and the convex surface of the furnace cover, airing, adhering a layer of fire-resistant heat-insulating glass wool with the thickness of 50mm on the upper edge of the furnace cover, and fixing the furnace cover and the furnace body firmly. The power supply of the control cabinet is started, and the electric heating time of the vertical arc-shaped electric heating furnace and the temperature control parameters of the thermocouple on the heating sheet are set as follows:
temperature rise time and temperature control parameter table of vertical arc-shaped electric heating furnace
Figure BDA0003427549630000081
Figure BDA0003427549630000091
Preparation:
the discharge port of the double-layer stirrer 21 is connected with a PVC transparent steel wire plastic pipe for a slurry suction port of a special pressing pump 22, the special pressing pump 22 is connected with a flow divider through a slurry conveying pipe (high-pressure steel wire braided rubber pipe), a discharge port on the flow divider 23 is connected with a slurry injection pipe 14 on a U-shaped groove through a slurry conveying pipe 232, and the testing equipment is in a normal state.
Mixing mud:
when the electric heating furnace is started to the later stage of the procedure 4, a double-layer stirrer is started, powder materials of the filling materials and the organic solvent are slowly added according to a proportion, 800ml of slurry is taken for flowability test after uniform mixing, and the flowability value is qualified when 270-280 mm, and the next step is carried out.
And (3) material ejection testing:
checking the running state of the special pressing pump, and ensuring the normal; and (3) dismantling the fireproof heat-insulating glass wool adhered to the upper edge of the furnace cover, starting a special pressing pump to perform slurry injection jacking test after completion, simultaneously observing the slurry rising condition of an arc gap through upper opening between the furnace body and the furnace cover of the vertical arc electric heating furnace, stopping pressing pump operation after jacking the arc gap, closing a cut-off valve of a slurry injection pipe, stopping heating, and unloading a special pressing pump slurry conveying pipeline.
And (3) equipment cleaning:
after the special pressing-in pump slurry conveying pipeline is removed, water is injected into the slurry stirring barrel, the special pressing-in pump is started, the slurry in all conveying pipelines and the special pressing-in pump is ejected out by water, and clean water is used for cleaning.
Test results inspection:
after the furnace body is naturally cooled to room temperature, the furnace cover is opened to check the test result, the strength and density of the solidified filler slurry are detected, if the strength of the solidified slurry is not lower than 10MPa and the volume density is not lower than 1.8g/cm 3 And (5) uniformly distributing the slurry, namely, qualified filling material proportion and qualified construction, or else, unqualified test results.
Example 3:
aiming at the situation that the replacement time of the converter bottom in the site is basically normal, the temperature in the annular gap in the converter is predicted to be about 400 ℃ after the construction is completed, the experimental implementation method is as follows:
coating a layer of fire-resistant thinner material on the concave surface of the magnesia carbon brick and the convex surface of the furnace cover, airing, adhering a layer of fire-resistant heat-insulating glass wool with the thickness of 50mm on the upper edge of the furnace cover, and fixing the furnace cover and the furnace body firmly. The power supply of the control cabinet is started, and the electric heating time of the vertical arc-shaped electric heating furnace and the temperature control parameters of the thermocouple on the heating sheet are set as follows:
temperature rise time and temperature control parameter table of vertical arc-shaped electric heating furnace
Figure BDA0003427549630000101
Preparation:
the discharge port of the double-layer stirrer 21 is connected with a PVC transparent steel wire plastic pipe for a slurry suction port of a special pressing pump 22, the special pressing pump 22 is connected with a flow divider through a slurry conveying pipe (high-pressure steel wire braided rubber pipe), a discharge port on the flow divider 23 is connected with a slurry injection pipe 14 on a U-shaped groove through a slurry conveying pipe 232, and the testing equipment is in a normal state.
Mixing mud:
when the electric heating furnace is started to the later stage of the procedure 4, a double-layer stirrer is started, powder materials of the filling materials and the organic solvent are slowly added according to a proportion, 800ml of slurry is taken for flowability test after uniform mixing, and the flowability value is qualified when 270-280 mm, and the next step is carried out.
And (3) material ejection testing:
checking the running state of the special pressing pump, and ensuring the normal; and (3) dismantling the fireproof heat-insulating glass wool adhered to the upper edge of the furnace cover, starting a special pressing pump to perform slurry injection jacking test after completion, simultaneously observing the slurry rising condition of an arc gap through upper opening between the furnace body and the furnace cover of the vertical arc electric heating furnace, stopping pressing pump operation after jacking the arc gap, closing a cut-off valve of a slurry injection pipe, stopping heating, and unloading a special pressing pump slurry conveying pipeline.
And (3) equipment cleaning:
after the special pressing-in pump slurry conveying pipeline is removed, water is injected into the slurry stirring barrel, the special pressing-in pump is started, the slurry in all conveying pipelines and the special pressing-in pump is ejected out by water, and clean water is used for cleaning.
Test results inspection:
after the furnace body is naturally cooled to room temperature, the furnace cover is opened to check the test result, the strength and density of the solidified filler slurry are detected, if the strength of the solidified slurry is not lower than 10MPa and the volume density is not lower than 1.8g/cm 3 The slurry distribution is uniform, namely the mixture ratio of the filling material is qualified and the construction is qualified, otherwise, the test result is thatAnd (5) failing to pass.
Example 4:
the test implementation method for the situation that the furnace bottom replacement time of the on-site converter is shorter and the construction speed is faster, and the temperature in the annular gap in the converter is predicted to be about 600 ℃ after the construction is completed is as follows:
coating a layer of fire-resistant thinner material on the concave surface of the magnesia carbon brick and the convex surface of the furnace cover, airing, adhering a layer of fire-resistant heat-insulating glass wool with the thickness of 50mm on the upper edge of the furnace cover, and fixing the furnace cover and the furnace body firmly. The power supply of the control cabinet is started, and the electric heating time of the vertical arc-shaped electric heating furnace and the temperature control parameters of the thermocouple on the heating sheet are set as follows:
temperature rise time and temperature control parameter table of vertical arc-shaped electric heating furnace
Figure BDA0003427549630000111
Figure BDA0003427549630000121
Preparation:
the discharge port of the double-layer stirrer 21 is connected with a PVC transparent steel wire plastic pipe for a slurry suction port of a special pressing pump 22, the special pressing pump 22 is connected with a flow divider through a slurry conveying pipe (high-pressure steel wire braided rubber pipe), a discharge port on the flow divider 23 is connected with a slurry injection pipe 14 on a U-shaped groove through a slurry conveying pipe 232, and the testing equipment is in a normal state.
Mixing mud:
when the electric heating furnace is started to the later stage of the procedure 4, a double-layer stirrer is started, powder materials of the filling materials and the organic solvent are slowly added according to a proportion, 800ml of slurry is taken for flowability test after uniform mixing, and the flowability value is qualified when 270-280 mm, and the next step is carried out.
And (3) material ejection testing:
checking the running state of the special pressing pump, and ensuring the normal; and (3) dismantling the fireproof heat-insulating glass wool adhered to the upper edge of the furnace cover, starting a special pressing pump to perform slurry injection jacking test after completion, simultaneously observing the slurry rising condition of an arc gap through upper opening between the furnace body and the furnace cover of the vertical arc electric heating furnace, stopping pressing pump operation after jacking the arc gap, closing a cut-off valve of a slurry injection pipe, stopping heating, and unloading a special pressing pump slurry conveying pipeline.
And (3) equipment cleaning:
after the special pressing-in pump slurry conveying pipeline is removed, water is injected into the slurry stirring barrel, the special pressing-in pump is started, the slurry in all conveying pipelines and the special pressing-in pump is ejected out by water, and clean water is used for cleaning.
Test results inspection:
after the furnace body is naturally cooled to room temperature, the furnace cover is opened to check the test result, the strength and density of the solidified filler slurry are detected, if the strength of the solidified slurry is not lower than 10MPa and the volume density is not lower than 1.8g/cm 3 And (5) uniformly distributing the slurry, namely, qualified filling material proportion and qualified construction, or else, unqualified test results.
Example 5:
as shown in FIG. 7, the invention further provides a pressing device for the converter movable furnace bottom filling material, which comprises a double-layer stirrer 21, a special pressing pump 22, a flow divider 23 and slurry conveying pipes 232, wherein 1 feed inlet and 4-12 discharge outlets are arranged on the flow divider, the discharge outlets are all provided with cut-off regulating valves, the double-layer stirrer 21 is connected with the special pressing pump 22 through a guide pipe, the special pressing pump is connected with the feed inlet of the flow divider 23 through the slurry conveying pipes, each discharge outlet on the flow divider is connected with the slurry conveying pipe 232, and the slurry conveying pipes are connected with the slurry injection pipes on the converter 25.
In the actual converter bottom heat exchange process, an annular gap exists between the converter bottom and the converter body, a plurality of slurry injection pipes are actually arranged at the converter bottom, a cut-off regulating valve 231 is arranged on each discharge port of the flow divider 23, the discharge ports can be respectively connected with one slurry injection pipe through a plurality of slurry conveying pipes, and then the slurry injection pipes simultaneously inject slurry into the annular gap of the converter, so that the slurry injection is uniform, and attention is paid to the fact that each slurry injection pipe is also provided with the cut-off valve 141.
The flow divider can also adjust the mud flow of each mud pressing pipe through the shut-off control valve, adjusts according to the mud injection condition in the annular gap of stove bottom, can make mud injection more even. In addition, if the blockage or the fault occurs, the two ends of each mud conveying pipe are respectively provided with a quick connector, so that the cut-off valve and the cut-off regulating valve can be closed at any time, and the replacement is carried out quickly.
The present invention is not described in detail in the present application, and is well known to those skilled in the art. Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.

Claims (6)

1. A test device for a converter movable furnace bottom filling material is characterized in that: the vertical arc-shaped electric heating furnace comprises a furnace body, a heating component in the furnace and a furnace cover, wherein an arc-shaped gap is formed between the furnace cover and the furnace body;
the furnace body is a vertical arc steel box body shell, an arc furnace groove is formed in the concave side of the furnace body, a glass fiber heat insulation material is stuck on the wall of the furnace groove, an aluminum silicate fiber board is built in the furnace groove, an arc groove-shaped hearth is also built on the aluminum silicate fiber board, a high-aluminum refractory brick is built at the bottom of the furnace groove, the outer vertical face of the high-aluminum refractory brick is flush with the outer vertical face of the lower edge of the furnace body, an arc table surface is formed at the upper part of the high-aluminum refractory brick, vertical magnesia carbon bricks are built on the arc table surface, the upper edge of the magnesia carbon bricks is close to the glass fiber heat insulation material on the upper wall of the furnace groove, the hearth is completely closed, and the outer vertical face of the magnesia carbon bricks is flush with the outer vertical face of the high-aluminum refractory brick;
the heating assembly in the furnace comprises a heating plate and 3 thermocouples, wherein the heating plate is arranged on the wall of the furnace chamber, one of the 3 thermocouples is arranged on the heating plate, the other thermocouple is arranged at the bottom of the heating plate, and the other thermocouple is arranged on an aluminum silicate fiber board below the furnace chamber;
the furnace cover is a vertical arc-shaped steel furnace cover and comprises an arc-shaped plate and a reinforcement fixed on the concave surface of the arc-shaped plate, U-shaped grooves are welded at the left end, the right end and the bottom of the convex surface of the arc-shaped plate, graphite packing is arranged on the outer side wall of each U-shaped groove, a slurry injection pipe is arranged in the middle of each U-shaped groove at the bottom of the arc-shaped plate, and a cut-off valve is arranged on each slurry injection pipe;
the diverter is provided with a feed inlet and a plurality of discharge outlets, and the discharge outlets are provided with cut-off regulating valves;
the double-layer stirrer is connected with a special pressing-in pump through a guide pipe, the special pressing-in pump is connected with a feed inlet of the flow divider through a slurry conveying pipe, and a discharge outlet of the flow divider is connected with a slurry injection pipe on the U-shaped groove through the slurry conveying pipe;
two sides of the furnace body are respectively hinged with 2 rotatable threaded handwheels and respectively fixed with 1 stable nail, and two sides of the arc plate are respectively fixed with 2 threaded grooves and 1 stable nail hole.
2. The apparatus for testing a living hearth packing of a converter according to claim 1, wherein: the double-layer stirrer is divided into an upper layer and a lower layer which can run simultaneously, a closeable discharging hole is formed in the bottom of the upper layer of the double-layer stirrer, a discharging hole is formed in the lower layer of the double-layer stirrer, and an anti-blocking filter valve is arranged on the discharging hole.
3. The apparatus for testing a living hearth packing of a converter according to claim 1, wherein: quick connectors are arranged at two ends of the mud conveying pipe.
4. The apparatus for testing a living hearth packing of a converter according to claim 1, wherein: the furnace cover is fixed with the furnace body through a threaded hand wheel and a threaded groove, a stable nail and a stable nail hole, and an arc-shaped gap is formed between the furnace cover and the furnace body.
5. The apparatus for testing a living hearth packing of a converter according to claim 1, wherein: the control cabinet is provided with a control system of a heating component, and the heating component passes through the glass fiber heat insulation material and the outer wall of the furnace body through a wire to be electrically connected with the control cabinet.
6. A method for press-in test of a converter live hearth filler, characterized by using the apparatus for testing a converter live hearth filler according to claim 1, comprising the steps of:
A. preparing, namely coating a layer of fireproof thinner on the outer vertical surfaces of magnesia carbon bricks and high-alumina refractory bricks, coating a layer of fireproof thinner on the convex surface of the furnace cover, airing, and then adhering a layer of fireproof heat-insulating glass wool with the thickness of 50mm on the upper edge of the furnace cover;
B. the furnace cover is closed on the furnace body, the steady nail passes through the steady nail hole, the threaded hand wheel is closed on the threaded groove, the furnace cover and the furnace body are fixed firmly by rotating the threaded hand wheel, an arc gap is formed between the furnace cover and the furnace body, then the double-layer stirrer is connected with a special pressing-in pump through a guide pipe, the special pressing-in pump is connected with a feed inlet of the flow divider through a mud conveying pipe, and a discharge outlet of the flow divider is connected with a mud injection pipe on the U-shaped groove through the mud conveying pipe;
C. starting a power supply of a control cabinet, setting a temperature value, heating a furnace body by a heating plate in a hearth, keeping constant temperature when the temperature in the furnace body reaches the set value, adding a furnace bottom filling material into a double-layer stirrer, and mixing slurry;
D. dismantling the fire-resistant heat-insulating glass wool in the step A, then starting to work by a special pressing pump, injecting the mixed slurry into the arc-shaped gap through a flow divider and a slurry injection pipe, observing the upper opening of the arc-shaped gap between the furnace body and the furnace cover until the slurry is full of the arc-shaped gap, closing the special pressing pump, closing a cutting valve of the slurry injection pipe, disconnecting the slurry conveying pipe, and stopping heating of the heating plate;
E. and (3) waiting for the furnace body to naturally cool to room temperature, then opening a furnace cover to check the test result, wherein the strength of the solidified slurry is not lower than 10MPa, the volume density is not lower than 1.8g/cm < 3 >, and the slurry is uniformly distributed to be successful.
CN202111582925.8A 2021-12-22 2021-12-22 Pressing device, test device and test method for converter movable furnace bottom filling material Active CN114231689B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111582925.8A CN114231689B (en) 2021-12-22 2021-12-22 Pressing device, test device and test method for converter movable furnace bottom filling material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111582925.8A CN114231689B (en) 2021-12-22 2021-12-22 Pressing device, test device and test method for converter movable furnace bottom filling material

Publications (2)

Publication Number Publication Date
CN114231689A CN114231689A (en) 2022-03-25
CN114231689B true CN114231689B (en) 2023-06-23

Family

ID=80761370

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111582925.8A Active CN114231689B (en) 2021-12-22 2021-12-22 Pressing device, test device and test method for converter movable furnace bottom filling material

Country Status (1)

Country Link
CN (1) CN114231689B (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3737928B2 (en) * 2000-04-25 2006-01-25 新日本製鐵株式会社 Operation method of rotary hearth type reduction furnace and metal oxide reduction equipment
CN101748247A (en) * 2008-12-09 2010-06-23 瓦房店金海轴承制造有限公司 Energy-saving heat treatment well type heating furnace
CN105316461A (en) * 2014-06-25 2016-02-10 高俊杰 Energy-saving heating furnace
CN205850673U (en) * 2016-06-30 2017-01-04 山西省交通科学研究院 A kind of building slurry Site conveyer
CN106868290B (en) * 2017-03-23 2018-10-12 东北大学 Al alloy parts heat treatment experiment method
CN108439958B (en) * 2018-04-04 2021-07-23 首钢集团有限公司 Joint refractory material for heat exchange of converter bottom and construction method
CN109059559B (en) * 2018-09-18 2023-09-22 平顶山东方碳素股份有限公司 Vertical electric heating hot air circulation preheating furnace
CN109231007B (en) * 2018-10-28 2020-03-27 中国十九冶集团有限公司南京分公司 Electric furnace body hoisting and mounting process
CN110822905A (en) * 2019-12-13 2020-02-21 中化二建集团有限公司 Movable assembly type heating furnace capable of eliminating stress through electric heating in furnace and construction method thereof

Also Published As

Publication number Publication date
CN114231689A (en) 2022-03-25

Similar Documents

Publication Publication Date Title
CN102844407A (en) Method for repairing inside of gas flue of coke oven, and device for repairing inside of gas flue
CN112113430B (en) Refractory material building method for smelting reduction furnace
CN101857444B (en) Thermal state ceramic jetting material for longevity type blast furnace
CN114231689B (en) Pressing device, test device and test method for converter movable furnace bottom filling material
CN109298016A (en) A kind of analog blast furnace cupola well coagulates the experimental provision of iron layer
CN110760316A (en) Method for repairing blowby guniting of coke oven brick gas duct
CN113604619A (en) Remote control thermal state wet method jetting lining manufacturing method
CN104058756B (en) A kind of hot maintenance pump pressure of hot blast stove system send buffering filler
CN110331252B (en) Method for repairing partially damaged brick cup of tap hole of converter on line
CN110540842B (en) Furnace body repairing method for recycling coke oven after overall shutdown
CN104059677B (en) A kind of improvement coke oven peephole string leakage device and method
CN110923391A (en) Pumping pouring repair equipment and method for converter tapping hole
CN110726662A (en) Experimental device for evaluating molten slag iron and erosion resistance of refractory material
CN201560206U (en) Heat-resistant hot blast valve for hot-blast furnace
CN211079221U (en) Device for maintaining gap between bottom-blowing quick-change nozzle and brick cup
CN110653450B (en) Online repairing method for converter body perforation
CN112986053A (en) Thermal-state repairing material fluidity test device and test method
CN210802023U (en) Graphite electrode production is with shape calcination case of preapring for an unfavorable turn of events
CN203938642U (en) A kind of coke oven peephole string leakage device of administering
WO2015133839A1 (en) Electric arc furnace and method for preheating scrap in electric arc furnace
CN110669897A (en) Device and method for maintaining gap between nozzle and brick cup after bottom blowing quick change
CN110306000B (en) Blowing-out method and spray gun device for blast furnace dissection research
CN219797976U (en) Heat exchanger and furnace body using same
KR101481612B1 (en) Apparatus for repairing of chamber
CN211321525U (en) Slip casting nail heating device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant