Novel method for melting glass liquid through immersion and combustion on glass liquid by jet pipe of combustor

Abstract

The invention relates to a novel method for melting glass liquid through immersion and combustion on glass liquid by a jet pipe of a combustor. The method is characterized in that the jet pipe of the combustor is inserted into the glass liquid from an upper part of the glass liquid through a kiln crown, a breast wall or a pool wall, a gaseous fuel and a gas oxidizing agent are respectively injected into the glass liquid through the jet pipe of the combustor or mixed and then injected into the glass liquid, so that the gaseous fuel and the gas oxidizing agent are combusted in the glass liquid, the generated high-temperature gas stirs the glass liquid, and most heat is transferred to the glass liquid and a mixed batch. For preventing severe erosion of the bricks of the kiln crown and preventing usage life shortening, the kiln crown is designed as a continuously updated structure, the structure is characterized in that the bricks of the kiln crown are suspended by a hanging wheel for compositing a movable kiln horizontal suspended ceiling, the bricks are easily and horizontally moved with entire row on the kiln along a transverse direction; new supplementary bricks of the kiln crown are added in the horizontal suspended ceiling from one transverse side of the kiln crown and pushed to the other side, at the same time, the corroded old bricks are pushed from the other side and discharged; so that continuous update of the bricks of the kiln crown can be guaranteed.

Description

technical field [0001] Glass melting process. Background technique [0002] The melting of molten glass is the most important and core process in the glass manufacturing process. Its advantages and disadvantages play a decisive role in environmental protection, energy saving and emission reduction, as well as the manufacturing quality and cost of glass. [0003] At present, the continuous melting of molten glass with fuel all adopts the method of surface heating. It has several disadvantages that are difficult to overcome: first, the thermal efficiency is low, and its heat loss accounts for about 70% to 80% of the total heat consumption, and the heat consumption per kilogram of glass liquid is above 1800 kcal; second, the melting rate is low, Generally, it is below 1.5 tons / square meter per day; the third is that the gas temperature in the combustion space of the melting pool is high and the flow rate is high, which erodes the refractory material of the kiln faster and red...

AI Technical Summary

Problems solved by technology

It has several disadvantages that are difficult to overcome: first, the thermal efficiency is low, and its heat loss accounts for about 70% to 80% of the total heat consumption, and the heat consumption per kilogram of glass liquid is above 1800 kcal; second, the melting rate is low, Generally below 1.5 tons / square meter per day; third, the gas temperature in the combustion space of the melting pool is high and the flow rate is high, which erodes the refractory material of the kiln faster and reduces the service life of the kiln

[0007] Its reason is that the method of this traditional immersion combustion has the problem that is difficult to solve: 1, clarification problem: when injecting fuel gas and air mixture (combustion product) in glass liquid, the operation condition of nozzle is more difficult, only the mixed gas consumes Melting will only proceed normally when the amount is greatly exceeded by air or steam

Due to the violent bubbling and tumbling of the glass liquid, the glass liquid is foamy, and its own tiny gas inclusions increase significantly, so it is difficult to clarify the glass liquid

2. Fuel problem: The ash foam components absorbed or mixed in the melt are mainly inert gases that have not participated in the reaction, that is, nitrogen released during fuel combustion, such as: a submerged combustion nozzle with a mixture of natural gas and air In the combustion products produced, the nitrogen content exceeds 70%, while the general combustion method allows the nitrogen content in the combustion products to not exceed 30%, and for flat glass, it is best not to exceed 10% (weight)

The above two problems can be effectively solved by the pure oxygen combustion process, but the problem is that the flame temperature is too high, the nozzle is corroded too fast, and it cannot be compensated or replaced.

3. Burner problem: Since the burner is immersed in the melt, its quality, placement and operation control are more stringent than before. Otherwise, once the burner fails and the glass liquid enters it to solidify, it cannot continue use

Reducing the diameter of the nozzle can solve the above problems, but it will cause insufficient combustion heat

4. The problem of refractory materials: due to the violent turbulence of molten glass in the kiln, the upper structure space will be washed by the splashed molten glass. Ordinary silica bricks and chrome bricks cannot meet the needs of this kind of melting kiln.

When multiple combustion nozzles are placed on the bottom of the pool, the strength of the refractory material will also be weakened

In addition, if natural gas is burned in the melt (7-10% of the total amount fed into the kiln), the heat exchange will be greatly enhanced

Increase the amount of natural gas directly burned in the furnace too much, and the refractory material will be severely corroded

5. The fluctuation of glass liquid viscosity, gas source pressure and flow rate has a great influence on the pressure and spray speed of the mixed gas, making it difficult to keep burning in the glass liquid for a long time and it is easy to cause defire or tempering phenomenon

6. The most critical problem is: Due to the limitation of materials, the burner (especially the flame nozzle) is extremely easy to wear and has a short life, and it can neither be compensated nor replaced

Therefore, despite long-term research and experiments, it is difficult to put into practical application

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