Air draft circulating system of glass annealing kiln.

Abstract

The invention discloses an air draft circulating system of a glass annealing kiln. The glass annealing kiln comprises an annealing kiln metal shell; electric heaters are mounted on two sides of the upper part of the annealing kiln metal shell; a centrifugal fan is arranged in a position close to the center of the top of the annealing kiln metal shell, roller transmission devices are arranged on two sides of the annealing kiln metal shell respectively, bearing pedestals are arranged on the roller transmission devices, rollers are arranged on the bearing pedestals, and the upper ends of the rollers are used for placing a glass tape. On-board exhaust pipes are arranged on two sides of the top of the annealing kiln metal shell, pipe openings of the on-board exhaust pipes are led into the on-board position in the annealing kiln metal shell, and meanwhile under-board exhaust pipes are arranged at the bottom of the side end of the annealing kiln metal shell. The on-board exhaust pipes and theunder-board exhaust pipe are gathered on an exhaust main pipe and are connected with an air inlet of the centrifugal fan through flanges; with arrangement of the on-board exhaust pipes and the under-board exhaust pipe, gas extracted from the annealing kiln metal shell is is used for exhausted out of a room.

Description

technical field [0001] The invention relates to the technical field of glass processing, in particular to an exhaust circulation system of a glass annealing kiln. Background technique [0002] Glass annealing furnace, as one of the three major thermal equipment for float glass production, plays a decisive role in the glass forming process. The glass ribbon coming out of the tin bath enters the annealing kiln through the transition roller table to cool down with a reasonable temperature curve. On the one hand, the annealing kiln is to eliminate the permanent stress of the glass, and on the other hand, the glass plate is transported to the cold end. After the glass is formed in the tin bath, the temperature at which it leaves the tin bath is about 580°C-620°C, and the temperature at which the glass plate is accepted by the cold section is about 70°C-80°C. In this temperature range, the glass undergoes a transformation from plastic to elastic. The change process of the body, a...

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Problems solved by technology

[0003] 1. The temperature curve in the front area of ​​the annealing kiln (A, B, and C areas) has high requirements, and the gas in the space is convectively circulated by the front and rear temperature gradients. Due to production reasons, when the temperature changes quickly, it is difficult to pass electric heating and tube bundles. The radiation cooler can quickly adjust the temperature in the kiln, which affects the stability of the annealing kiln's operating conditions and has a certain impact on the quality of glass forming annealing

[0004] Second, the annealing kiln is in a thermal working environment, and it is inevitable that dust and particles will enter the annealing kiln from the glass belt entrance and other gaps, especially the dust particles of refractory materials for masonry and sealing refractory materials in the annealing kiln Accumulation will seriously affect the quality of the glass plate surface

If dust particles adhere to the rollers of the annealing kiln due to static electricity, etc., in severe cases, it will cause scratches, indentations and other defects on the lower surface of the glass ribbon.

[0005] 3. The dust accumulated on the rollers of the annealing kiln needs to be cleaned up in time, and the bottom seal needs to be opened, and the cleaning time is long, which affects the annealing temperature of the glass ribbon in the annealing kiln, and is prone to frying, which affects the yield of the glass plate

At the same time, when the side seals are opened for a long time to clean the rollers, the cold air outside and the high-temperature air in the kiln will have strong convection due to the density difference, and the cold air will enter the kiln, causing the temperature of the rollers in the kiln not to touch the glass to drop suddenly, causing the rollers to break down. Sudden contraction, causing bending deformation

Damage to the annealing equipment, such as severe deformation may cause the glass plate to break and affect the continuity of glass production

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