RU1838256C - Method for producing mineral melt - Google Patents

Abstract

SUMMARY OF THE INVENTION: A mineral melt is produced for producing mineral wool by melting a charge in a shaft furnace using flue gases passing through the column of the charge. Melting is carried out on a layer of ceramic aggregate placed in the lower part of the furnace on the grate. The ceramic aggregate is heated with exhaust gases, the energy consumption for heating the ceramic aggregate is 15-3.0%. Of the total amount of energy required for the process. 5 ill.

Description

The invention relates to a technology for producing melt used in the production of mineral wool.

An object of the invention is to increase the productivity of a process.

Figure 1 shows a preferred design of a melting furnace, a longitudinal section; figure 2 is a section aa in figure 1; not fig. 3 - another design of the melting furnace, longitudinal section; in Fig.4 is a combustion chamber in a melting furnace, section BB in Fig.Z; in Fig. 5 - melting furnace, top view .- .-

The furnace comprises a vertical shaft 1 for preheating and smelting the feed. The molten mineral material 2 is loaded into a water-cooled feed mixture 3 located at the top of the shaft 1. At the bottom of the shaft 1 there is a water-cooled grate 4, which carries a porous layer of ceramic

spherical bodies 5 of a filler having a diameter of 100-200 mm and mineral material 2, In the combustion chamber 6, main burners 7 are installed under the fragile area, using gas, fuel oil or pulverized coal as fuel. The mineral material 2 in the shaft 1 is preheated and then heated to the melting temperature by transferring heat from the hot exhaust gases from the main burners 7. The melt 8 flowing from the shaft 1 is collected in the lower part 9 of the combustion chamber and heated to the operating temperature by means of a transfer heat from the exhaust gases and energy supplied through the molybdenum electrons 10, and then released through the outlet 11, which is located at a certain height above the bottom of the combustion chamber 6, thus in the lower part 9 a molten bath 12 is formed. Electric current of large magnitude from molybdenum (L

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of the output electrodes 10 passing through the melt causes the melt to move, thus the melt is homogenized.

The main burners 7 are directed towards the surface of the bath of the melt 12, as a result, heat from the fuel flame is transferred to the melt before the exhaust gases having a temperature of about 1600 ° C go up to the mine 1. Hot exhaust gases are returned from the charge through the pipe 13 A hot exhaust gas recuperator 14 may be installed in a conduit 13 for preheating the combustion air used in the main burners 7.

Additional burners 15, which use gases as fuel, are installed at an angle above the water-cooled grate 4. Auxiliary burners 15 contribute to the melting of the starting material 2. However, their main task is to prevent the formation of tunnels during melting of the mineral material and ensure that the layer of ceramic aggregate bodies 5 is cleaned during the shutdown of the process.

The lower part 9 of the combustion chamber is provided with a ceramic lining, which is mainly susceptible to hot melt attacks, so the lining needs to be updated from time to time, therefore, part 9 can be made removable to quickly replace it with another with a new lining.

The melting furnace according to the invention can be equipped with a device, for example a screw, for reloading the residues from the fiber manufacturing process directly into the combustion chamber 6. The corresponding surface of the bottom of the combustion chamber is F-10 m, and the corresponding sectional area of the shaft 1 is approximately 3 m for the furnace. having a melting capacity of about 5 t / h.

The furnace shown in Figs. 3-5 contains a vertical shaft 1. having a square sectional area. The shaft 1 contains in its lower part a water-cooling grate 4. which carries a porous layer of ceramic spherical aggregate bodies 5 having a diameter of 100-200 mm. Mineral material 2 (whose fraction

preferably 40-80 mm) loaded from above shaft 1 (not shown). Mineral material 2 is heated to its melting point by transferring heat from the hot flue gases from

burners 16, 17, 18, 19, 20, 21 installed in the combustion chamber 6. Burners using gas, fuel oil or pulverized coal as fuel are directed towards the surface of the melt pool 12 in such a way that

heat from the fuel flame is transferred to the melt before the exhaust gases at a temperature of about 1600 ° C go up into the shaft 1. The hole 11 for the release of the melt is located at a certain height above

the bottom of the combustion chamber 6 in order to form a molten bath 12 in the lower part 9. The lining of the lower part 9 is especially susceptible to attacks of the hot melt and needs to be replaced from time to time, for this reason this part can be made removable to quickly replace another newly lined .

The corresponding bottom surface of the combustion chamber 6 is 4-10 m2, and the corresponding sectional area of the shaft 1 is approximately 3 m for a furnace having a melting capacity of 5 t / h.

Claims (1)

SUMMARY OF THE INVENTION A method for producing a mineral melt mainly for producing mineral wool by melting a charge in a charge furnace using exhaust hot gases passing through the charge column, characterized in that, for the purpose of . To increase the productivity of the process, melting is carried out on a layer of ceramic aggregate located in the lower part of the furnace on the grate, which is heated with hot exhaust gases, moreover, the energy consumption for heating the ceramic aggregate is 15-30% of the total energy required for the process. I X Figz 77