JPH0369964B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for constructing a monolithic refractory for a pig iron mixer car when constructing a refractory in a furnace using monolithic refractories. Conventionally, many pig iron mixing cars have been used as containers for transporting large amounts of hot metal. In the steelmaking process, hot metal is pretreated to remove [S], [Si], and [P], and in steelmaking (mainly in a converter), high-speed blowing and slag minimum processes that mainly involve removal of [C] and heat raising are used by Nippon Steel. It is becoming mainstream in the world. All companies operate pig iron mixing trucks as a pretreatment process for large quantities of hot metal. Pig-mixing cars have a tap hole in the center and a long body shape to ensure stability of the bogie from the rail span and to prevent temperature drop when transporting large quantities of hot metal. For this reason, it is difficult to construct monolithic refractories, and since the technology for forming monolithic iron has not been developed to date, there is no precedent for constructing monolithic refractories over the entire surface of a mixed iron car, and all companies are implementing brick construction instead. is the substance. In this method, dozens of tons of bricks are built one by one in a sealed furnace using a large number of work vehicles, so it takes a long time to complete the construction and the environment is poor due to dust, high temperature, ventilation, etc. The present invention has been made to solve the above-mentioned conventional problems, and by inventing a method for constructing monolithic refractories, it has been possible to make the entire surface of a pig iron mixer vehicle monolithic, thereby making endless construction possible. A feature of the present invention is that the pig iron mixer car has a structure that can be divided into parts, and that it facilitates the setting of cores used in the construction of monolithic refractories. That is, the gist of the present invention is to separate the separator from the main body and place it separately in the construction of a refractory lining for a pig iron mixer car, which consists of a hot metal storage main body and a separator that is detachably attached to the main body. After that, a expandable core is inserted into the main body, and a fluid is injected into the core to form the inner cavity of the main body, and then an irregular shape is inserted into the gap formed by the stop and the outer shell. This is a method for constructing a monolithic refractory for a pig iron mixer, which is characterized by injecting a refractory, solidifying the monolithic refractory, and then recovering the core from which the fluid has been discharged from the main body. Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. The pig iron mixer consists of 1 main body and 2 separation parts.
It is fixed by a bolter mount 5 and a bolter 6 attached to the furnace body reinforcing ribs 9 and the reinforcing flange 8. The separating section 2 removes the cotter 6 and hangs the wire 10 on the hanging hook 7 and attaches it to the overhead crane 1.
1 is lifted up and separated from the main body 1. The mixed pig iron car was separated immediately after entering the repair shop, and the main body part 1
is cooled down to a temperature at which it can be repaired in a dedicated cooling field.
The separation section 2 is left to cool with the refractory side facing upward. Once cooling is complete, a demolition machine breaks down the refractories inside the furnace.
Both the main body part 1 and the separation part 2 are moved to a monolithic refractory installation factory as only the steel shell 12. The steel shell 12 is provided with studs 13 at several places on each side to prevent the monolithic refractory from falling off.
First, the furnace hot water contact part 14 of the main body part 1 is constructed with bricks 14a. This area is subject to abrasion from falling hot metal, so brick construction is common in terms of thermal technology. Next, the construction core 15, which is expandable and contractible and designed to have a predetermined gap with the iron skin 12 when fluid is filled in, is placed in the reduced state 15.
At step a, the wire 17 is attached to the core hanger 16 and carried into the furnace using the crane 11. Incidentally, a gas filling port 18 and a liquid filling port 19 are attached to the central portion of the core, and valves 20a and 20b are provided respectively. Start the liquid pump 22, such as a water pump, on the work deck 21, open the valve 26,
Next, when the valve 20a is opened, the liquid 23 flows into the 27
It flows into the core through the pressure feed hose. The inflow amount is measured using a meter on the fluid pumping machine and adjusted to balance the buoyancy force that the core receives during monolithic refractory construction. Next, the gas injection machine 24, such as a compressor, on the work deck 21 is started, and the valve 25 is started.
When the valve 20b is opened, the gas 28 passes through the press-fit hose 29 and enters the core 15a. As the internal pressure of the core increases, the core gradually expands, and when the internal pressure increases to a sufficient level and a predetermined gap is formed between the core surface and the iron skin, the valve 25,
20b is closed. Check the internal pressure using a pressure gauge. In this case, the pressure that the core receives from the refractory is approximately
0.7Kg/cm ² (from the earth pressure formula), and the inside of the core is
Try to maintain the pressure at ^around 2Kg/cm2. The material 42a is kneaded by a monolithic refractory kneader 42 on the work deck 21, and the kneaded material is poured into the gap between the core and the iron shell using a pouring device 30 such as a screw feeder. Further, if the monolithic refractory kneader system has a supply means such as a chute, the pouring device 30 may not be particularly provided. After pouring is completed, the degree of solidification is checked and the core 15 is withdrawn. The core removal procedure is to first start the exhaust fan 32 on the work deck, open the valves 20b and 33 to expel the gas 28 inside the core and reduce the core, and then start the drainer 34. Valve 20a, 35
Crane 1 after opening and draining the liquid 23 inside the core.
1. Take it out of the furnace. The separator 2 is placed on the GL with the furnace mouth 3 facing down, and predetermined metal frames 37 and 3 are attached to the furnace mouth 3 and the desulfurization port 36, respectively.
8 is set, monolithic refractory is poured from above, and the ceiling part 39 is constructed. The completely solidified separation part 2 is lifted up by a crane 11 and set on the main body part 2. After the setting is completed, both are connected with a colander 6, and monolithic refractories are poured into the joint 40 between the constructed upper surface of the main body part and the constructed lower surface of the separation part. Incidentally, during the above-mentioned pouring, the pig iron mixer is tilted so that the joint is in a position where construction is easy. Additionally, stamp material or the like may be used to construct the joints. In addition, the core of this example is made of waterproof material such as nylon or rubber, and the surface is coated with
To facilitate core removal, apply a mold release agent such as oil or attach a nylon sheet. The above describes the case of major repair of a pig iron mixer car, but the present invention is also effective for partial repairs such as intermediate repairs and minor repairs. A monolithic refractory is poured into the section 41. According to this method, the pig iron mixer car can be rebuilt and repaired endlessly. Table 1 compares the implementation details of the conventional brick construction method and the irregular shape construction method of the present invention.

[Table] As shown in the table above, the construction period can be shortened by 3 days, and the number of personnel is halved. In addition, it is easy to replenish (endless repair) and the cost of materials is reduced.In addition, since the worker does not have to enter the furnace, there is little dust generation and the working environment is extremely good. Furthermore, as an additional effect of using the split type, there are shortening of the cooling time of the pig iron mixer car and shortening of the time for dismantling the furnace. Although a division method has been described as an embodiment of the present invention, there is no problem even if the core is set without performing a division method.

[Brief explanation of drawings]

Figures 1a, b, and c are schematic explanatory diagrams of the mixed pig iron car furnace body of the present invention, Figure 2 is a diagram of the construction status of the monolithic refractory (main body part), Figure 3 is a diagram of the construction status of the monolithic refractory; Fourth
The figure shows an irregular construction drawing of the divided part, Fig. 5 shows the situation when the pig iron mixer car is connected, and Fig. 6 shows the situation of addition and repair. 1: Pig-mixing car body part, 2: Pig-mixing car separation part, 3: Furnace mouth, 5: Cotter holder, 6: Cotter, 7: Hanging hook, 8: Reinforcement flange, 9: Reinforcement rib, 1
0: Wire, 11: Overhead crane, 12: Iron shell, 13: Stud, 14: Hot water contact part, 15: Core, 16: Hanging tool, 17: Wire, 18: Gas filling port, 19: Liquid filling port, 20: Valve, 2
1: Work deck, 22: Liquid pressure feeder, 23: Liquid, 24: Gas pressure injection machine, 25: Valve, 26: Valve, 27: Pressure feed hose, 28: Gas, 29:
Press-fit hose, 30: Pour-in device, 32: Exhaust fan, 33: Valve, 34: Drainer, 35: Valve, 36: Desulfurization port, 37, 38: Metal frame, 39: Ceiling, 40: Seam, 41: Erosion damage part, 42: kneading machine, l: slag surface, m: slag line.

Claims (1)

[Scope of Claims] 1. When constructing a refractory lining for a pig iron mixer car, which consists of a hot metal storage main body and a separating part detachably provided on the main body, after separating the separating part from the main body and placing it separately. A core that can be expanded and contracted is inserted into the main body, a fluid is injected into the core to form a cavity inside the main body, and then a monolithic refractory is inserted into the gap formed between the core and the outer shell. 1. A method for constructing a monolithic refractory for an iron mixer car, which comprises injecting a material into the core, solidifying the monolithic refractory, and then recovering the core from which the fluid has been discharged from the main body.