KR100402022B1 - Method for stacking refractory in air mixing chamber and hot air duct of hot stove - Google Patents

Abstract

The present invention relates to a method for constructing a conduit in a mixed cooling chamber and a contact tube of a hot stove facility, and to firmly build a condensed condensation in a mixed cooling chamber to prevent a lead and decay accident, and to cause a dropout accident and a collapse accident due to a convection expansion difference in a contact tube. The present invention relates to a method of building a blast furnace hot air blast furnace and a liaison tube for an improved blast furnace to effectively prevent a rupture accident caused by a rupture of a contact tube, and an explosion accident.

The present invention relates to a method of constructing a lead in a mixed cooling chamber and a contact pipe of a hot stove facility, wherein an intermediate portion of the mixed cooling chamber is equipped with a reinforcement mechanism for supporting the moon lead in the middle portion of the mixed cooling chamber, and the reinforcing mechanism includes a horn. It is arranged to surround the middle part of the cold chamber in the circumferential direction and when the deformation of the edibles occurs due to thermal expansion, it is firmly supported on the upper side edges and constructed so that it does not fall down. Provide construction method.

According to the present invention, by contributing to stabilization of the hot blast furnace equipment during the final operation of the furnace, it is possible to improve the productivity, as well as increase the competitiveness of the furnace by reducing the repair cost and increasing the productivity of the furnace operation.

Description

Mixed cooling room and liaison building method of blast furnace hot-air furnace {METHOD FOR STACKING REFRACTORY IN AIR MIXING CHAMBER AND HOT AIR DUCT OF HOT STOVE}

The present invention relates to a method of constructing a conduit in a mixed cooling room and a contact tube of a hot stove facility, and more particularly, to firmly build a condensed inside a mixed cooling chamber to prevent a collapse and collapse accident, and the dropout accident caused by a convection expansion difference in a contact tube. The present invention relates to a method for building a blast furnace hot air blast furnace and a contact tube associated with an improved blast furnace to prevent rupture accidents and to effectively prevent rupture accidents caused by rupture of contact tubes.

In general, the operation of the blast furnace is performed by heating the wind supplied by the blower equipment to the inside of the blast furnace by raising the temperature to 1150 ℃ -1250 ℃, and the heating operation of the blast furnace equipment is always performed in four configurations. Two blowing operations and two burning operations are being carried out.

As shown in FIG. 1, the blowing operation is performed by cooling air (150 ° C.-200 ° C.) for supplying heat stored in the heat storage chamber 100 from the blower 110 during the combustion operation. Heated during the transfer, the dome contact tube 112, combustion chamber 114, mixed cooling chamber contact tube 116 is moved in the order, mixed with some cold air in the mixed cooling chamber 120 to maintain a constant blowing temperature, during the blowing time In order to supply high-temperature, high-pressure wind in the hot air side contact pipe 122 and the hot air main pipe 124 in order.

Combustion work is combusted in the combustion chamber 114 when the combustion gas and air is injected into the combustion chamber burner 130 in the air blowing operation is completed, the generated high-temperature exhaust gas to the heat storage chamber 100 through the dome contact pipe 112. It enters and heats the smoke and is finally discharged into the stack 134.

By repeating the heat storage and blowing operation of the combustion operation, the wind volume (6300 Nm ³ per minute) and the high heat (1350 ° C.) are increased in the heat storage chamber 100, the dome contact tube 112, the combustion chamber 114, the mixed-cooling chamber contact tube 116, In order to operate in the mixing chamber 120, and maintain the air temperature (1150-1250 ℃) by mixing the cold air in the mixing chamber 120 is supplied to the blast furnace through the hot air inlet pipe 122, the hot air main pipe 124 to the temperature Repeated expansion and contraction caused by each contact tube 112, 116, 122, combustion chamber 114, mixed cooling chamber 120, the strain is made, the gap between the lead and the lead creates a high heat in the outer shell of the hot stove When high pressure (4.5kg / ㎠) is in contact, when the red heat occurs due to the high temperature, the swelling is repeated like a balloon, and when a long time elapses, the burst occurs due to the stress deformation of the bark, it shows an explosion phenomenon when cracking.

In addition, in the mixed-cooling chamber 120, as shown in FIG. 5, in consideration of the high heat and friction coefficient of the hot stove, the lead and the material are designed according to the characteristics of the shrinkage expansion and transformation point of the lead, and from the outer shell 10 by type of the lead. Insulation castable (15), ceramic fiber (Ceramic fiber, Spraydon) (150) Insulation lead (20), fire-resistant lead (30) is used, but each of the wall and cone portion of the mixed cooling chamber (120) Due to the different contraction and expansion of the pontoon, the pontoon protrudes and the collapse progresses due to the progress of the jungle and the weakening of the pontoon support.

Conventionally, as shown in FIG. 5, the conduit 116 and 122 are deteriorated by the deterioration of the ceramic fiber (Ceramic fiber, Spraydon) 150 due to the monthly elongation as a factor that appears as a complex decay factor of the mixing chamber 120. The conical ring edge 152 and the set edge 154 of the) side protrudes, and thus, the lunar edge 156 of the mixed cooling chamber 120 weakens its bearing capacity, and the edges fall out of the mixed cooling chamber 120. .

In addition, as shown in FIG. 7, in the liaison tube 116 connecting the combustion chamber and the mixed cooling chamber of the hot stove, the lunar edge and the support cone ring edge 152 are designed to be small swans, and thus, the inside of the mixed cooling chamber liaison tube 116. When the alumina set lead 154 is expanded, it easily falls off and collapses, and even in the absence of the collapse, high temperature and high pressure hot air is caused by the cracks of the joints and joints, and heat and cracks are repeated.

In addition, due to severe heat generation (600 ℃) in the weak part of the contact tube of the hot blast furnace, special care should be taken for this part.In the red part, there is always a risk of explosion due to cracking caused by stress of the air purge and steel bar. In addition, lead and dropout accidents occur continuously in these glowing areas.

In addition, in the contact tube 112 connecting the heat storage chamber and the combustion chamber of the hot stove, the conventional construction method is a hot stove according to the degree of expansion of the inner side of the silica lead 170 when the thermal expansion is different from the thermal insulation lead 172 of the outside. When the years of use have elapsed, cracks and cracks occur in the insulation lead and joint (megi), so that high temperature and high pressure act on the outer shell 174. Due to the decrease in strength, an explosion may occur when rupture.

On the other hand, each of the contact pipes 112 and 116 and the mixed-cooling chamber 120 of the hot stove has a functional difference compared to the combustion chamber 114 and the heat storage chamber 100 of the hot stove, Even if the same high temperature air flow is supplied to the blast furnace due to continual load, the degree of contraction and expansion due to high pressure and high heat is high, and the friction of the duct is so large that many years after the operation of the hot blast furnace, Deformation leads to heat and cracks in the shell, falling off and collapse.

The present invention is to solve the conventional problems as described above, the purpose of which is to prevent the heat and cracks of the contact tube and the shell of each hot blast furnace, and to prevent the falling accident and collapse accidents due to the elongational expansion difference The present invention is to provide a method of building a condensation chamber and a contact tube of a blast furnace.

1 is an overall configuration diagram of a mixed cooling room and a contact pipe facility of the blast furnace hot stove to which the present invention is applied;

Figure 2 is a detailed view showing the mixed cooling room condensation method of the blast furnace hot stove according to the present invention;

Figure 3 is a detailed cross-sectional view showing the method of forming the duct of the connecting pipe connecting the heat storage chamber and the combustion chamber of the hot stove according to the present invention;

Figure 4 is a detailed cross-sectional view showing a method of forming the twelfth of the connecting tube connecting the combustion chamber and the mixed cooling chamber of the hot stove according to the present invention;

5 is a detailed view showing the mixed cooling room condensation method of the blast furnace hot stove according to the prior art;

FIG. 6 is a detailed cross-sectional view illustrating a method of forming a duct in a liaison tube connecting a heat storage chamber and a combustion chamber of a hot stove according to the related art; FIG.

FIG. 7 is a detailed cross-sectional view illustrating a method for constructing a duct of a connecting pipe connecting a combustion chamber and a mixed cooling chamber of a hot stove according to the related art.

Explanation of symbols on the main parts of the drawings

10 ..... Iron fifteen ..... Castable kite

20 ..... with insulation lead and 30 ..... with alumina lead

50 ..... Reinforcement mechanism 52 .....

54 ..... special alumina kite

56 ..... Stepped neck

100 ... Regenerative chamber 114 .... Combustion chamber

116. Contact 120. Cooling room.

134 ... stack

The present invention to achieve the above object,

In the method of building lead in the mixed-cooling room of a hot stove installation and a communication pipe,

A reinforcing mechanism for supporting the moonyeonwa in the middle of the mixing chamber is mounted at the middle of the mixing chamber, and the reinforcing mechanism is arranged to enclose the middle portion of the mixing chamber in the circumferential direction so that deformation of the coupling due to thermal expansion occurs. When, by providing a solid blast furnace hot-melt and liaison tube construction method of the blast furnace characterized in that it is constructed so as not to fall down by firmly supporting the upper moonyeonwa.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The mixed cooling chamber and the contact tube twisting and building method of the blast furnace hot stove according to the present invention is as shown in Figs.

2 and 4, the twisting and weaving method of the present invention is a conical ring edge (152) and a set edge with shrinkage of ceramic fiber (Ceramic Fiber, Spraydon) 150 due to the wall expansion and expansion as shown in FIGS. In order to prevent weakening of the holding capacity of the upper edge and 156 due to the protruding effect of 154, as shown in FIG. 2, the conventional ceramic fiber 150 construction is omitted inside the shell 10, and the insulation cage Expanding the size of the sable 15 and the adiabatic foil 20 so that even if the alumina wire 30, which is a refractory wire, expands, there is no contraction of the adiabatic castable 15 and the adiabatic wire 20, and the adiabatic wire ( 20) protects the shell 10 by blocking the heat to the shell 10.

In addition, the middle portion of the mixing chamber 120 is equipped with a reinforcing mechanism 50 for supporting the moonyeonwa 156 in the middle portion of the mixing chamber 120, the reinforcing mechanism 50 is the iron shell 10 An iron rod 52 is mounted to penetrate the insulating castable 15 and the insulation lead 20 from the rod, and a special alumina block 54 having an alumina content of about 95% or more is inserted into the tip of the iron rod 52. It has a structure in which a stepped neck block (GOOSE NECK) 56 is mounted to surround the special alumina block 54 outside thereof.

Such a reinforcement mechanism 50 is arranged to surround the middle portion of the mixing chamber 120 in the circumferential direction. On the other hand, the special alumina block 54 is inserted into the iron rod 52 in a state that the lower edge (54A) is supported on the upper surface of the alumina soft wire 30 that is the refractory wire of the lower side, the special alumina The stepped neck block 56 which encloses the block 54 from an external row has a lower end portion thicker than an upper end portion, and the thickness of the lower end portion is the thickness of the lower alumina lead 30 of the special alumina block 54. The thickness of the upper portion corresponds to the thickness of the alumina lead 30, which is a refractory lead made up as a moon lead on the upper side of the stepped neck block 56.

The reinforcement mechanism 50 has an accident such as dropping to the lower side because the special alumina block 54 firmly supports the upper side edges 156 through the iron rod 52 even though deformation of the edges occurs due to thermal expansion. Is prevented.

And, as shown in Figure 4, in the liaison tube 116 between the combustion chamber and the mixing chamber, the conventional conical ring edge 152 and the set edge 154 is developed as a single annular edge 70 as a unit By constructing, it prevents duct damage.

In addition, the hot air of high temperature and high pressure penetrates, and repetitive thermal expansion due to the annular lead and the heat generated from the 70 side is reinforced by the heat insulating castable (15) thickness of FIG. To prevent. In addition, in order to prevent the hot air of high temperature and high pressure from penetrating and weakening, the construction method of the moonyeonwa 156 is vertical to horizontal.

In addition, as shown in FIG. 3, in the contact tube 112 connecting the heat storage chamber and the combustion chamber of the hot blast furnace, a heat insulation material (Bulk Fiber) 80 is inserted between the silica lead 170 and the heat insulation lead 172. And the thermal expansion difference between the thermal insulation edge and the 172 to absorb the heat insulating material 80 to prevent the damage of the thermal insulation edge 172, by blocking the internal high temperature, high pressure so as not to fall to the steel shell 174, Prevent rupture, explosion and explosion.

On the other hand, the outer shell of the contact pipes 112 and 116, respectively, to build a heat-resistant castable lead in a ring shape of a certain thickness to support the high temperature and high pressure inside the contact pipe, and the red heat, rupture and explosion of the iron pipe To prevent.

As described above, the present invention is equipped with a reinforcing mechanism extending in the circumferential direction to the middle portion of the mixing chamber to strengthen the bearing capacity with the moonyeon, and the conical ring edge 152 and the set-yeon and inside the contact tube between the combustion chamber and the mixing chamber; It is constructed as a single annular lead (70) integrally formed with (154), and the connecting pipe connecting the heat storage chamber and the combustion chamber of the hot stove has a silica fiber (170) and a heat insulating material (Bulk Fiber) (172) between the insulation lead (172). By inserting the thermal insulation material 80 absorbs the difference in thermal expansion between the silica lead 170 and the insulation lead 172 to prevent the explosion phenomenon due to heat deposition, rupture, rupture.

Therefore, by contributing to stabilization of the hot stove facility during the final operation of the furnace, it is possible not only to improve productivity, but also to increase the competitiveness by reducing the repair cost and increasing the productivity of the furnace operation by extending the life of the furnace.

Claims (5)

In the method of building lead in the mixed-cooling room of a hot stove installation and a communication pipe, A reinforcing mechanism for supporting the moonyeonwa in the middle of the mixing chamber is mounted at the middle of the mixing chamber, and the reinforcing mechanism is arranged to enclose the middle portion of the mixing chamber in the circumferential direction so that deformation of the coupling due to thermal expansion occurs. If, when the upper side of the moonwae firmly supported by the blast furnace hot blast mixing chamber and liaison tube construction method characterized in that it is constructed not to fall to the bottom. According to claim 1, The reinforcing mechanism 50 is mounted to the iron rod 52 so as to penetrate the heat insulating castable 15 and the heat insulation edge 20 from the shell 10, the tip of the iron rod 52 A special alumina block 54 having an alumina content of 95% or more is fitted therein, and a stepped neck block (GOOSE NECK) 56 is mounted to surround the special alumina block 54. Mixed chiller and liaison tube construction method. The special alumina block (54) is inserted into the iron rod (52) with its lower edge (54A) supported on the upper surface of the alumina lead 30, which is a fireproof lead on its lower side. The stepped neck block 56 enclosing the special alumina block 54 from an external row has a thickness of a lower end portion of which corresponds to a thickness of the lower alumina lead 30 of the special alumina block 54. The thickness of the blast furnace mixed cooling room and the contact tube twisting method of the blast furnace hot stove characterized in that the coincidence of the thickness of the fire retardant alumina yeonsu 30 that is built as the moonyeon 156 on the upper side of the stepped neck block 56 . The method according to claim 1, wherein the conical tube 116 inside the mixed cooling chamber is constructed as a single annular edge 70 having a conical ring edge 152 and a set edge 154 integrally, In the contact tube 112, the thermal insulation difference between the silica lead 170 and the insulation lead 172 is inserted between the silica lead 170 and the insulation lead 172. Mixed blast furnace and liaison building method of the blast furnace hot blast furnace, characterized in that the absorption is constructed to prevent damage to the insulation and 172. According to claim 4, wherein the outer shell of the communication pipe (112, 116), respectively, heat-resistant castable edibles are formed in a ring shape of a predetermined thickness to support the high temperature and high pressure inside the communication pipe, and the red heat and tear of the steel pipe And blast furnace hot-mixing chamber and liaison tube building method for preventing the explosion phenomenon.