SU1353573A1 - Method and apparatus for drying or heating the lining of ladle - Google Patents

Abstract

This invention relates to the field of metallurgy, in particular to the drying of metallurgical vessels. The purpose of the invention 1 increase the drying efficiency. For this, the device comprises a lid 2 with a flow line 3 passing through it and a discharge channel 8. 2 is provided with a pipe 7 which covers a part of the pipe 3 and is located in the cavity of the tank 1, and a discharge channel 8 is formed with a gap between the pipe 3 and the pipe. The image allows to increase the efficiency of the heating process and the linings of the metallurgical tank 1 (FME) by uniformly heating the linings with a coaxial flow of the coolant supplied to the lower zone of the tank 1 with a high degree of circulation in the cavity of the tank and, as a result, creating maximum utilization of its heat removal capacity, resulting in fuel savings and reduction in the drying time of FME 2 sec. Po and 3 GoP, f-ly, 3 d., 3 tab. b c (L) Thermal carrier “FM.

Description

The invention relates to metallurgy and can be used in the drying of the lining of metallurgical vessels, such as steel ejector ladles.

The purpose of the invention is to increase efficiency.

Fig. 1 shows a scheme for implementing the proposed method for drying a steel casting ladle; Figs 2 and 3 - the same, options.

The lining or drying of the metallurgical tank 1, for example, a casting ladle, is dried or heated by means of a cover 2, through which the heat transfer feed pipe 3 passes, at the end of which nozzles 4 are connected to the air supply paths 5 and natural gas

6. When this cover 2 is provided covering the part of the pipeline 3 pipe

7 placed in the cavity of the tank 1, whose cut is placed at some distance from the nozzles 4, and the annular gap between the pipe 3 and the nozzle serves to drain the channel 8 of the spent heat carrier. In addition, between the neck of the tank 1 and the roof plate 2 there is a gap for the exit of part of the coolant from the tank 1

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When a mixture of natural gas and air is compressed, gaseous 1; the heat carrier from the nozzles 4 enters the lower zone of the tank 1. Then the coolant, evenly distributed around the periphery of the bottom, rises into the upper part of the tank 1, while part of the coolant escapes through the gap between 2. and the neck of the tank 1, and the rest of the coolant (60-90%) is directed to the exhaust duct 8, thereby creating circulation of the heat carrier in the tank 1, shown by arrows. Part of the coolant is again drawn into the flow coming from the nozzles 4 and continues to circulate in the cavity of the tank 1, giving up its heat to heat the lining, which leads to recirculation of the flow of the coolant in the cavity of the tank 1. This increases the residence time of the coolant and extends its path in the cavity

As examples of the implementation of the method, industrial steel-teeming ladles with a capacity of 160 tons are dried with a bulk lining, having

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upper diameter Dg 3200 mm, lower diameter D 2800 mm, height H 3500 mm.

J- In the well-known variant of drying, the burner is installed at a distance of 1000 mm from the bottom of the ladle, and the spent coolant is directed from the tank through the gap between the bracket and the throat-10 ladle.

In embodiments of the drying according to the invention, the burner is also installed at a distance of 1000 mm from the bottom of the ladle, while the valve is tightly connected with an additional pipe covering the burner and having an outlet to the atmosphere beyond the top dimension

collars, and annular gap between the burner and the additional pipe

is a waste channel of the spent coolant. Comparative characteristics of options for methods of drying the bucket are shown in table 1. Thus, reducing the amount of exhaust coolant discharged from the central lower part of the tank below 60% reduces the efficiency of the bedrock by increasing its duration, and increasing the above 90% also reduces efficiency by increasing the temperature inside the bucket of the upper limit (about 700 ° C) ; due to the quality of the dried lining,

The device for drying or heating the lining of the metallurgical tank 1 contains installed with a gap. with respect to the end of the container, a lid 2 with a conduit 3 passing through it for supplying a heat transfer medium.

Krshka 2 is equipped with a discharge pipe 7 installed coaxially with a gap relative to the pipeline 3 for supplying the heat transfer medium. Lower

The nozzle section is located above the section of the pipeline 3 from the condition (0.1-0.4) N, and its diameter does not exceed 0.4 D, where D and H are respectively the smallest diameter and the greatest height of the cavity of the tank 1.

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When the diameter of the nozzle 7 is greater than 0.4 D, the free space of the cavity of the tank between the nozzle 7 and the walls of the cavity of the tank 1 is reduced, which impairs the circulation of the coolant, thus creating the possibility of premature inflow of the coolant into the discharge nozzle 7. Maximum

the diameter of the nozzle 7 is determined from the condition of the passage of the spent coolant through the gap between the nozzle 7 and the pipeline 3 and depends on the technologically specified flow rate of the coolant supplied through the pipeline 3 to the cavity of the tank 1,

When the lower section of the nozzle 7 is located less than 0.1 N above the section of the pipeline 3, the flow of the heat transfer fluid coming out of the nozzles 4 can be increased by the waste heat source flows into the discharge nozzle 7. This reduces the temperature of the heat transfer fluid that raises the temperature which reduces the thermal efficiency of the device.

With the location of the cut-off of the pipe 7 more than 0.4 N above the cut of the pipeline 3, premature removal of the coolant from the cavity of the tank 1 is possible, which also reduces the thermal efficiency of the device.

Examples of operation of the drying device for industrial steel-casting ladles with a capacity of 160 tons are carried out in accordance with the described conditions.

Table 2 shows the dependence of the technological parameters on the diameter of the outlet pipe. Its lower cut is positioned at a distance of 0.3 N (1050 mm), the amount of heat carrier withdrawn from the central lower zone of the tank is 80%.

Thus, a significant decrease in the diameter of the outlet pipe reduces the removal of the spent heating element, which reduces the drying efficiency due to an unacceptable increase in the temperature inside the bucket (maximum 700 ° C), an increase in the diameter of the pipe reduces the recirculation of the coolant in the tank cavity as a result of its premature removal to the central OTD channel.

Table 3 shows the dependence of the technological parameters on the proposed method of drying the bucket from the height of the location of the section of the outlet pipe above the pipe section. The diameter of the outlet pipe is maintained at 0.3 D (840 mm), the amount of coolant removed from the central lower zone of the tank is 80%.

Thus, reducing the height of the lower section of the outlet pipe above the pipe cut will unacceptably increase the temperature in the bucket cavity, and an increase in height worsens recirculation and reduces the thermal efficiency of the device.

Claims (5)

1. A method of drying or heating the lining of a metallurgical tank, including the supply of gaseous coolant to the lower zone of the tank, its circulation in the cavity of the tank and the subsequent removal from the tank through its upper part, about aphids and ayushi and so that, in order to increase efficiency, the coolant is further withdrawn from the central lower zone of the tank in the amount of 6090%. 2. A device for drying or heating the lining of a metallurgical vessel containing the installed with a gap relative to the end of the container. The roof has a pipeline for supplying coolant, characterized in that, in order to improve efficiency, the roof is equipped with a discharge pipe installed coaxially with a gap relative to the pipeline for supplying heat carrier, while the lower section of the pipe is located above the section of the pipeline from a heat carrier pipe, the lower section of the pipe is located above the section of the pipeline from a heat carrier pipe, the lower section of the pipe is located above the section of the pipeline from a heat carrier pipe, from the heat carrier 0.1-0.4) H, and its diameter does not exceed 0.4 D, where D and H are the smallest diameter and the greatest cavity height, respectively. capacity. 3. The device according to claim 2, wherein the discharge pipe is provided with a suction channel. 4. The device according to claim 2, about tl and - with the fact that the pipeline is equipped with a separating diaphragm located below the nozzle section, 5. The device according to claim 2 and 3, characterized in that the intake channel and the separation diaphragm are made in the form of sections, evenly but arranged in a circle. Drying time, h Temperature inside bucket, ° C Natural consumption gas m / h Drying time, h Temperature inside bucket, with Natural consumption pelvis, Drying time, h Temperature inside the bucket, С Natural gas consumption Spreadsheets sixteen 14 12.5 12 11.2 15 545 610 650 720 585 131 98 85 80 120 table 2 13 12 12.5 13.5 15 725 650 630 610 585 85 90 97105 117 Table 3 10.8 11.5 12 13 15 880 720 670 630 600 525 73 80 85 87 98 120 Figg Editor S.Patrusheva Compiled by V. Sazonov Tehred I. Veres Order 5657/13. Circulation 741 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 : Production and printing company, Uzhgorod, Projecto st., 4 FIG. five Proofreader MSMaksimishinets