JPH05240586A - Hot-spray repair method of refractory lining - Google Patents

Abstract

PURPOSE:To adequately perform the repair work corresponding to the damage state of a part to be repaired and the allowable repairing period of time by a method wherein the water addition amount is determined according to the measured surface temperatures of a refractory lining at the beginning of repair work and thereafter corresponding to the surface temperatures of spraying refractory material sprayed on the part to be repaired. CONSTITUTION:Changes in the renewing surface temperatures of a spraying refractory material 10 sprayed on to a part 9 to be repaired on a refractory layer 8 are actually measured from time to time by an infrared ray radiation thermometer 11. An arithmetic controller 12 controls a water feed controller 13 as a feed controller and a spraying refractory material feed controller 14 so that the ratio of water addition amount to the spraying refractory material 10 is changed corresponding to the measured temperatures. Thus, the water addition amount is determined corresponding to time actual surface temperatures of the spraying refractory material 10 sprayed on the part to be repaired, resulting in an excellent deposition ratio. In addition, adequate repair work can be performed corresponding to the damage state of time part to be repaired and the allowable repair period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot repair method for refractory linings.

[0002]

2. Description of the Related Art For example, a hot repair method as disclosed in Japanese Examined Patent Publication No. 58-32315 is disclosed, the contents of which are shown below with FIGS. 9 and 2.

The sprayed refractory material 10 sent from the pressure-feeding tank 1 to the pipe 2 and the tank 5 to the pipe 6 provided with the valve 7 corresponding to the surface temperature of the repaired portion 9 of the refractory lining layer 8.
In the method of repairing by spraying hot from the nozzle 3 to the repairing part by mixing in the mixing part 4 by changing the mixing ratio of the moisture sent to, the spraying time and the repairing part 9 of the refractory lining layer 8 are preliminarily shown as in the example shown in FIG. Correspondence of the surface temperature of the spray is measured, and the relationship between the spraying time and the sprayed refractory / moisture mixing ratio is fixedly set, and the surface temperature of the repaired part immediately before the spraying is measured or estimated and the refractory based on that temperature is measured.・ Beginning the spraying work with the water mixing ratio, and thereafter, based on the relationship between the surface temperature of the repaired part itself and the water addition amount obtained in advance by the spraying time signal, the mixing ratio of the sprayed refractory material and water. It is a hot spray repair method that controls

[0004]

In the above-mentioned conventional technique, the surface temperature of the repaired part itself immediately before spraying is measured or estimated to obtain the water mixture ratio and the spraying is started. The water mixing ratio is determined by the relationship of the mixing ratio.

However, immediately after the start of the spraying, the surface temperature of the repaired portion during spraying is greatly influenced by the surface temperature of the repaired portion, the spraying distance, the nozzle moving method, etc., and the temperature drop pattern varies with each repair. Is the reality.

Therefore, it is not possible to supply an appropriate amount of water according to the surface temperature of the repair material that is sequentially deposited and laminated on the actual repair portion,
A good spray construction product cannot be obtained. In addition, this method requires constant movement speed of the spray nozzle, spray amount per unit time, and the like, and there is a problem that appropriate repair cannot be performed according to the damage status of the repaired part and the allowable repair time.

[0007]

In order to solve the above problems, the inventors of the present invention determined the amount of water initially added when repairing the refractory lining surface with a spray material by measuring the refractory lining surface temperature. The amount of water added thereafter is provided according to the surface temperature of the sprayed material adhered to the repaired portion to be sprayed.

Although the surface temperature of the refractory lining is roughly determined by the shape characteristics and the specification conditions, it actually varies greatly due to the difference in the blowing stop temperature during steel refining and the change in the amount of heat radiated from the iron shell due to damage to the refractory lining. The estimation by axis is extremely inaccurate. Therefore, the surface temperature of the refractory lining is measured by, for example, an infrared radiation thermometer, and the amount of water added for mixing before spraying the spray material is determined by the temperature.

Next, after the start of spraying the spraying material, the surface temperature of the spraying material, which is successively laminated and updated, changes with the temperature of the refractory lining itself even if the moving speed of the spraying nozzle and the spraying amount per unit time are constant. In addition to variations in the variation, it is even more difficult to estimate because it greatly depends on the spray distance, the amount of added water, the water temperature, the nozzle moving method, the outside air temperature, and the like.

Therefore, according to the present invention, as shown in FIG. 1, a change in the surface temperature of the sprayed refractory material 10 attached to the sprayed repaired portion 9 of the fireproof lining layer 8 and renewed is also measured every moment by the infrared radiation thermometer 11 or the like. According to the temperature, the ratio of the sprayed material and the amount of added water is controlled by the arithmetic and control unit 12 by controlling the cutout adjusters 13 (water supply amount adjusting device) and 14 (spraying material supply amount adjusting device). To do. In the figure, 5 is a water tank, 6 is a hose, 4 is a hydrogenation ring, 1 is a hopper, 3
Is a spray nozzle and 2 is a hose.

FIG. 2 shows an example of changes in the spraying time, the surface temperature of the repaired part and the amount of added water.

FIG. 3 shows the relationship between the surface temperature of the repair material 10 attached to the repair part 9 and the water content. A good correlation is recognized between the surface temperature of the repair material 10 and the water content, and the water content added is determined using this relationship.

FIG. 1 is an overall schematic view of a spraying device for automatically controlling the amount of added water.

FIG. 4 shows a concrete configuration of the water supply amount adjusting device 13, in which a signal for operating the adjusting valve 7'is transmitted from the control panel 15 in accordance with a signal from the arithmetic and control unit 12, The control valve 7'is opened so that the proper amount of water is obtained. On the other hand, the amount of water flowing through the hose 6 is measured by the flow meter 16, and this value is converted into an electric signal by the converter 17 and input to the control panel 15 to form a loop circuit. The method of directly measuring the temperature has a merit that the arithmetic and control unit 12 can be relatively simplified and the cost is low as compared with the method of programming the surface temperature of the repaired portion in advance.

[0015]

【Example】

Example 1 Target container; Oxygen top blowing converter (340 t) Temperature measurement method; Infrared radiation thermometer Spraying material; Magnesia spraying material supply rate; 100 kg / min Spraying distance; Approximately 1.5 m Additive water temperature; 20 ° C Nozzle movement Method and cross-section for repair; Figures 5 and 6 Method of determining amount of added water; Automatic water volume control method based on temperature measurement results; temperature transition and moisture content transition obtained by this are shown in Figure 7. When spray repair was performed under the above conditions, the results shown in Table 1 were obtained.

[0016]

[Table 1]

Example 2 Target container: Oxygen top-bottom blowing converter (340 t) Temperature measuring method; Infrared radiation thermometer Spraying material; Magnesia spraying material supply rate; 80 kg / min Spraying distance; About 1.5 m Additive water temperature; 21 ° C. Nozzle moving method and repair section; similar to the previous example, shown in FIGS. Method for determining the amount of added water: This is an automatic water amount control method based on the temperature measurement results, and FIG. 8 shows changes in temperature and changes in the amount of water for mixing obtained thereby. When spray repair was performed under the above conditions, the results shown in Table 2 were obtained.

[0018]

[Table 2]

[0019]

Since the water content is determined in accordance with the actual surface temperature of the spray repaired portion, the optimum water content can be supplied, and a good adhesion rate and a good quality of the sprayed body can be obtained.
Further, since it is not necessary to keep the moving speed of the spray nozzle, the spray amount per unit time, etc. constant, it is possible to perform appropriate repair according to the damage condition of the repair part and the allowable repair time.

[Brief description of drawings]

FIG. 1 shows an example of a spraying device according to the present invention.

[Fig. 2] Reference example of the relationship between the spraying time, the surface temperature of the repaired part, and the amount of added water

FIG. 3 is a graph showing the relationship between the surface temperature of the repaired part and the amount of added water.

[Fig. 4] Example of water supply amount adjusting device

FIG. 5: Nozzle moving method

FIG. 6 is an explanatory view of a repair cross section.

FIG. 7 shows an automatic water flow control method based on temperature measurement results,
Explanatory diagram showing changes in temperature and changes in water content obtained thereby

FIG. 8 is an automatic water amount control system based on temperature measurement results,
Explanatory diagram showing changes in temperature and changes in water content obtained thereby

FIG. 9 is a schematic explanatory view of a conventional dry spraying device.

[Explanation of symbols]

 1 Hopper 2 Hose 3 Spray Nozzle 4 Watering Ring 5 Water Tank 6 Hose 7 Valve 7'Control Valve 8 Fireproof Lining Layer 9 Repairing Part 10 Spraying Material Layer 11 Thermometer 12 Computational Control Device 13 Water Supply Adjusting Device 14 Spraying Material Supplying Device Volume control device 15 Control panel 16 Flow meter 17 Converter

Claims (1)

[Claims] 1. The initial amount of water added when repairing the refractory lining surface with a spray material is determined by measuring the temperature of the refractory lining surface, and the amount of added water thereafter is the amount of the spray material adhering to the sprayed repaired portion. A hot-spray repair method for a refractory lining, which is determined according to the surface temperature.