Slag washing water steam recycling and white fog removing system and recycling method

Abstract

The invention provides a slag washing water steam recycling and white fog removing system and a recycling method. The slag washing water steam recycling and white fog removing system comprises a slagwashing water steam chimney close to a blast furnace, at least one cooling spraying device and a hot air furnace assembly; the lower portion of the slag washing water steam chimney can contain waste slag discharged out of the blast furnace and carries out slag washing operation, the cooling spraying devices are arranged in the middle of the slag washing water steam chimney and spray atomized waterto the lower portion of the slag washing water steam chimney, the hot air furnace assembly is communicated with the blast furnace and the upper portion of the slag washing water steam chimney, the hot air furnace assembly can convey generated hot air into the blast furnace, and conveys the treated waste gas to the upper portion of the slag washing water steam chimney, the mist spraying cooling direct heat exchange manner is adopted, the cooling efficiency is high, in combination with the humidity and condensation effect of atomized water, a small amount of water is sprayed, and therefore a large amount of water steam can be recycled, water steam which is not condensed is subject to waste gas temperature rise dilution, the water steam saturability is reduced, and white smoke is prevented from being generated.

Description

technical field [0001] The invention relates to a system and a recovery method for recovering slag water vapor and eliminating white mist. Background technique [0002] With the rapid development of China's economy, China's steel output is also increasing year by year. Since 2011, the annual output has basically reached about 700 million tons. In recent years, it has fluctuated slightly as the country optimizes the economic structure, but it is still maintained at a high level Production, followed by blast furnace ironmaking produced a large amount of blast furnace slag, which was estimated to reach about 270 million tons in 2016. These blast furnace slags are hot when they are produced and need to be cooled, because water slag will be generated in different cooling methods And dry slag, most of the water slag is produced at present, and the most widely used cooling methods include the bottom filtration method and the INBA (INBA) method, etc. No matter which method is used, ...

AI Technical Summary

Problems solved by technology

Most of the time in the past, society, government departments, enterprises, environmental protection companies, etc. mainly focused on various dust, sulfur oxides, nitrogen oxides, dioxins and other pollutants emitted from chimneys, while the current environmental protection technology and environmental protection facilities It is also mainly aimed at the purification of the above-mentioned pollutants, and there is no special technology for white smoke. At present, various universities and companies are also conducting research and development and experiments on this issue. Possible technical directions include recovering water in the flue gas through condensation, Heating the flue gas to a higher temperature, etc., but condensation requires the consumption of cold sources and additional heat exchange equipment, while heating the flue gas requires heat sources and additional heating equipment, which will increase the investment and operating costs of corporate environmental protection facilities

In addition, domestic research is mainly aimed at processes with huge white smoke emissions such as wet desulfurization, and there are not many studies on the elimination of white smoke produced by blast furnace slag washing water.

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