Method and device for preheating batch by using waste heat of fume from pure-oxygen combustion glass furnace

Abstract

The invention relates to a method and a special device for preheating a batch by using the waste heat of fume from a pure-oxygen combustion glass furnace. The method comprises the following steps: granulating the glass batch; dehydrating and drying the grains; and preheating the grains by using a multilayer vertical turning plate preheating mode, wherein the glass batch and the hot fume are contacted indirectly, namely the fume radiates heat to the glass batch by convection, and the glass batch is preheated by a multilayer turning plate preheater to above 400 DEG C and then is delivered to the next process step. Multiple layers of turning plates and multiple flues are arranged in the preheating device, a fume inlet communicated with the flues is positioned on the outer side of the side water on the lower part of the preheater, a fume outlet communicated with the flues is positioned on the outer side of the other side wall on the upper part of the preheater, and the fume inlet and the fume outlet are arranged diagonally; the special preheating device is used to preheat the glass batch, the utilization rate of the waste heat of the high-temperature fume is high, no smoke dust pollution is produced; under self suction, the fume rises along the flues, so no power is consumed; the vertical structure occupies small floor area, so the replacement of space for time is realized; and the promotion and implementation of the device are easy.

Description

technical field [0001] The invention relates to a method and a special preheating device for preheating glass batch materials by using high-temperature flue gas produced by an all-oxygen combustion glass melting furnace, and belongs to the field of reutilization of waste heat of high-temperature flue gas in a melting furnace during glass production. Background technique [0002] Among the various heat losses of the glass melting furnace, the residual heat of the flue gas accounts for the largest proportion, and the heat taken away by it accounts for about 30% of the total energy consumption of the melting furnace. Therefore, how to improve the recovery and utilization of waste heat from furnace exhaust has always been a hot research topic in the industry. [0003] The oxy-fuel combustion of the glass melting furnace is to change the traditional air-fuel combustion system into an oxygen-fuel combustion system to improve the combustion efficiency of fuel, thereby reducing fuel...

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Problems solved by technology

Most domestic flue gas waste heat recovery adopts waste heat boilers to produce saturated steam of 0.4-0.8MPa, but due to the difference in seasons, regions and production steam conditions, the effect of recycling is not ideal, and there are also waste heat boilers or waste heat power generation. large energy loss

[0005] The patent application with the publication number CN101328005A discloses a preheating method and device for oxy-fuel combustion glass batch materials, and proposes a heat exchange method using high-temperature flue gas and batch materials through radiation conduction, which has a certain recovery effect ; but the preheating chamber of the preheating device is only a container with an interlayer, and the glass batch material in the inner cavity of the container is preheated only by the flue gas rising directly in the interlayer, resulting in uneven preheating; at the same time, the In the preheating device, the heat exchange time between the glass batch material from top to bottom and the flue gas from bottom to top in the interlayer is short, and it is difficult to reach the preheating temperature of the batch material, so the utilization effect of the waste heat of the flue gas is not ideal, and the energy loss is large; in addition , Send the mixed batch material directly into the preheating device, there will be problems such as flying of ultra-fine powder in the batch material, blocking material, sticky material and uneven distribution of material layer, resulting in high melting temperature and long melting time of glass batch material , the smoke and dust generated will pollute the batch materials, resulting in the quality of glass products not being guaranteed

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