Energy-saving system of cooling air hose of glass annealing kiln and cooling method of glass tape

Abstract

The invention relate to an energy-saving system of a cooling air hose of a glass annealing kiln and a cooling method of a glass tape. Each pipeline is equipped with a draught fan which is provided with a frequency converter, and the frequency converters are freely controlled by an industrial personal computer to reaching the purpose of adjusting the rotating speed of the draught fans, so that each branch air hose is more convenient to control. The size of the cooling air amount of each branch air hose can be conveniently adjusted according to the temperature adjusting demands of glass plates in different regions, so that the temperatures in each region in the annealing kiln is reasonable and the best glass annealing effect is achieved. The equipment investment is reduced, the pipeline system is simplified, the energy utilization rate of the manufacturer is greatly improved and the electric energy consumption of the ventilating system of the annealing kiln is reduced, so that the effect of saving energy and protecting the environment is realized.

Description

technical field [0001] The invention relates to the technical field of annealing kilns of a glass production line, in particular to an energy-saving system for cooling air ducts of a glass annealing kiln and a method for cooling a glass ribbon. Background technique [0002] The annealing kiln is one of the three major thermal equipments in the glass production line. Its function is to reduce the temperature of the glass plate from 600-650°C to 70-90°C in a controlled manner according to the requirements of the annealing process. It adopts all-steel and all-electric structure, which is composed of several sections, and is divided into several zones longitudinally according to the annealing curve. Each zone adopts different heating and cooling systems according to the requirements of glass plate temperature and annealing process, so as to complete good annealing and reasonable cooling. At present, in the annealing kiln of the glass production line, the high-temperature glass p...

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Problems solved by technology

At present, in the annealing kiln of the glass production line, the high-temperature glass plate emits a large amount of heat when cooling in the annealing kiln, and the cooling system of the annealing kiln needs to discharge the heat out of the kiln through heat exchange; there are many existing annealing kiln ventilation and cooling systems There are many butterfly valves on the ventilation pipeline. By adjusting the opening of the butterfly valve, the air volume of each air channel is adjusted. The application of the butterfly valve on the pipeline realizes the function of air volume adjustment, and at the same time increases the resistance of the pipeline and increases the consumption of electric energy. Therefore, , how to reduce the resistance on the pipeline and at the same time realize the adjustment of the air volume of each air channel is the key to reduce the energy consumption of the ventilation and cooling system of the annealing kiln

[0003] The cooling air adopts natural wind. Due to the large change in air temperature due to seasons and day and night ambient temperature, the amount of cooling air varies greatly. For example, in winter, only a small amount of air is needed to meet the process requirements; During the process, the lateral temperature distribution is high in the middle and low in the side; in production, the automatic butterfly valves at different positions have different openings. Usually, the annealing kiln fans use motors with rated output power. When it is necessary to reduce the air volume, generally use Adjust the opening of the valve and the baffle to control the air volume. The current annealing kiln glass production line uses a fan to connect multiple branch pipelines. Therefore, the pipeline must have a butterfly valve to adjust the air volume. When adjusting the air valve on a branch pipeline, The air volume in other branch pipelines will increase or decrease, which affects the stability of the annealing temperature, increases the running resistance of the fan, increases power consumption, and aggravates the damage to the cooling system of the valve body

[0004] Because the glass annealing kiln uses a regulating valve with low control precision, under the action of a high-power fan, the actual ventilation of the butterfly valve is not completely controlled by the opening of the valve. Even when it is closed, there is still about 5% of the ventilation. This not only increases the difficulty of control, but also requires an electric heater to supplement the heat for the thin glass that does not need to be cooled at the edge, which increases the consumption of electric energy

[0005] The retrieved patent document with the application number of 201320071464.2 discloses a flat glass annealing kiln air cooling device. There are cooling air pipes on both sides of the glass plate, and a cooling air pipe inclined at 45 degrees at the front end of the cooling air pipe. Nozzle, the baffle parallel to the glass plate is connected to the cooling air pipe nozzle, it is difficult to cool down the high-temperature gas in the annealing kiln, and it is difficult to ensure that the glass plate dissipates heat evenly

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