SU564272A1 - Furnace for producing quartz glass slugs - Google Patents

Description

one

The invention relates to devices designed to compress quartz glass blocks.

A known furnace for fusing quartz discs comprising a chamber, a burner, a substrate and nozzles of the combustion products 1.

A furnace for fusing a block of quartz glass is also known; it contains a two-section chamber formed by refractory bars with external thermal insulation, a burner installed in the chamber arch, a substrate and nozzles of the discharge of combustion products 2J.

However, in such furnaces, it is impossible to have semi-CPT1, high-quality large-sized quartz blocks, due to the presence of a temperature gradient along the height of the furnace’s hot space, and cold air leaking into the furnace with an increase in the furnace diameter.

1.1el of the invention is the production of coarse quartz blocks of quartz blocks and an increase in the quality of glass.

This is achieved by the fact that in a furnace for fusing a block of quartz glass containing

The two-section chamber with external thermal insulation formed by refractory bars, the burner, the substrate and nozzles of the combustion products installed in the roof of the chamber, are made with an extension, the cross section of which is not less than 1.5 square of the cross section of the substrate, and the bottom the part is with bevels, and the ratio of the cross-sectional areas of the upper and lower sections is equal to

4- a 1 and the bottom section is equipped with

Optional O-ring.

The drawing shows the proposed part, a general view.

The furnace has a chamber 1 formed with refractory bars with external thermal insulation 2, a burner 3, a substrate 4 with a fused silica glass block, nozzles of the combustion products 5, a vertically sliding ceramic ring 6. The upper section of the chamber on the burner side is expandable, transverse the cross section of which is not less than 1.5 square of the cross-section of the substrate, and the height is not less than 65 mm (one row of refractory masonry).

Lowering the temperature of the process technology is necessary to reduce the overgrowth of the chamber and the burner with silica blot, reduces the loss of raw materials, reduces the temperature of the furnace roof, and therefore protects the quartz parts of the burner from crystallization.

The cross sectional area of the upper CfKUHH chamber below the expansion is a square with a side equal to the diameter of the substrate (0 of the substrate is equal to Q. of the quartz block) minus 30-flOO mm depending on the diameter of the weldable block.

On the opposite side, the upper section is made with bevels.

The cross sectional area of the lower section of the chamber is a square with a side equal to the diameter of the substrate.

plus 10 ° 4225 mm, and the ratio of the areas of the cross-section of the upper and lower sections is equal to gz.

This design of the chamber allows the temperature in the lower part of the upper section to be increased by increasing the heat flux, which leads to an increase in the fusion rate and the percentage of glass output from the raw material. Stabilization of the temperature in the furnace chamber is also achieved by reducing cold air inflow into the lower part of the furnace chamber, which is ensured by a vertical ceramic sliding ring that closes the ring ;. a different gap in the lower part of the furnace at the top position of the substrate and gradually opening this gap when lowering the substrate with the block.

The suction of the mixture of the reaction products with the air sucked into the furnace from below is produced through several nozzles 5, which are located symmetrically around the heat perimeter. furnace space.

From 1t industrial tests, the proposed furnace confirmed the possibility of obtaining high-quality large-sized quartz blocks, while the deposition rate increased by 1.5 times, and the yield of glass mass from raw materials increased by 15%. The lifetime of the furnace increased, the process of deposition of the quartz block became more optimal and managed.

Claims (2)

1. Author's certificate number 292893, cl. From 03 To 5 / GS, 1968. 2. Copyrights certificate NO 366152, cl. From 03 To 5/00, 1970.