Method for melting galss of projection tube panel by full-oxygen combustion

Abstract

The present invention relates to a method for melt-making projection kinescope tube screen glass by adopting full-oxygen combustion technique. The full-oxygen combustion technique can be used for medium-sized and small-sized glass tank furnace. The area of tank furnace is 25-40 sq.m, and its full-oxygen combustion fuel is kerosene, diesel oil, heavy oil, antural gas, liquefied petroleum gas and LPG. Said invention adopts 99% oxygen gas and fuel to make combustion, and its produced waste gas only has CO2 and H2O, so that it is favorable for environmental protection, and its melting rate can be raised by above 30%, its glass composition is stable, and the service life to tank furnace also can be raised.

Description

technical field [0001] The invention belongs to a method for melting projection tube screen glass, in particular to a method for melting projection tube screen glass by all-oxygen combustion. Background technique [0002] Comparison of glass pool furnace types 1. The glass pool furnaces used in glass melting mainly include the following types, horizontal flame pool furnaces with regenerators, double vertical flame pool furnaces, horseshoe flame pool furnaces with regenerators, unit kiln. 2. Diesel, heavy oil, natural gas, liquefied petroleum gas, LPG, etc. are used for heating the above-mentioned pool furnaces, and air is used for combustion. The longitudinal temperature is easy to control, the combustion air can be preheated to about 900 °C, and the thermal efficiency is high. The heat consumption for melting 1kg of glass is about 3000kal. Due to the regenerator, the one-time investment in building the furnace is high. 4. The construction cost of the double-hulled vertica...

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Problems solved by technology

2. The heating fuel for the above-mentioned pool furnace is diesel oil, heavy oil, natural gas, liquefied petroleum gas, LPG, etc., and air is used for combustion. The longitudinal temperature is easy to control, the combustion-supporting air can be preheated to about 900°C, the thermal efficiency is high, and the heat consumption for melting 1kg of glass is about 3000kal. Because of the regenerator, the one-time investment for building a furnace is relatively high

6. Unit furnaces are generally used for glass pool furnaces with a small melting area. This type of pool furnace has a small one-time investment in building a furnace. The longitudinal temperature in the melting pool of the pool furnace is very easy to control. Now a metal heat exchanger is used to preheat and support combustion Air, but the thermal efficiency of melting glass is relatively low, and the melting rate is usually 0.25 to 0.45

[0003] The use of air for the combustion of molten glass has the following disadvantages: 1. It is not conducive to environmental protection, and air is used to support the combustion, and the air contains about 79% N 2 , there is NO in the exhaust gas discharged from the pool furnace after high temperature X exist

2. The alkali metal oxides in the glass volatilize during the melting process, which is not conducive to the stability of the chemical composition of the melted glass. The volatilized alkali vapor erodes the refractory materials of the pool furnace and reduces the service life of the glass pool furnace. A large amount of alkali Gold alkali oxide deposits in the regenerator and flue, which is not conducive to the continuous and stable operation of the pool furnace

3. The thermal efficiency is low. It needs enough heat to preheat the combustion air while exhausting the flue gas to take away a lot of heat energy.

4. The melting rate is low, generally the melting rate is lower than 0.45