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

A recovery method and water vapor technology, which are applied in the improvement of process efficiency, details of furnaces and blast furnaces, etc., can solve the problem of increasing the investment and operation cost of environmental protection facilities of enterprises, not much research on white smoke elimination methods, consuming cold sources and adding heat exchange. Equipment and other problems, to achieve the effect of easy operation and maintenance, simple equipment, and prevention of white smoke

Pending Publication Date: 2018-03-20
MCC CAPITAL ENGINEERING & RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: The 80°C water vapor entering the slag flushing steam chimney 2 from the slag flushing facility has a saturated steam pressure of 47.4kPa, and the middle part of the slag flushing steam chimney 2 is in direct contact with the water sprayed by the spray device 7 to cool down At 60°C, the saturated steam pressure drop is 19.9kPa, and the condensed amount of water vapor exceeds 55%. After the condensation and nucleation of atomized water droplets sprayed down, most of the water droplets flow back to the slag flushing facility through the chimney wall without being condensed. Part of the liquid droplets entrained by the water vapor continue to go upward, and mix with the exhaust gas of the hot blast stove at 150 ° C to raise the temperature. By adjusting the amount of exhaust gas introduced, the mixed temperature is raised to 95 ° C. Considering factors such as temperature and the amount of flue gas introduced, this When the water vapor saturation is much lower...

Embodiment 2

[0039] Embodiment 2: The water vapor at 75°C entering the slag flushing water steam chimney 2 from the slag flushing facility has a saturated steam pressure of 38.6kPa, and directly contacts with the water sprayed from the spray device 7 to cool down to 50°C, and the saturated steam The pressure drop is 12.3kPa, and the condensed amount of water vapor exceeds 65%. After the condensation and nucleation of atomized water droplets sprayed down, most of the water droplets flow back to the slag washing facility through the chimney wall, and part of the liquid is entrained by the uncondensed water vapor. The drop continues to rise, mixes with the exhaust gas of the hot blast stove at 150°C to raise the temperature, and adjusts the amount of exhaust gas introduced to raise the mixed temperature to 80°C. Considering factors such as temperature and the amount of introduced flue gas, the water vapor saturation at this time is much higher. Below 30%, the mixture of flue gas and water vapo...

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PUM

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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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/08C21B7/14C21B9/10
CPCC21B3/08C21B7/14C21B9/10Y02P10/20
Inventor 陈燕英伟
Owner MCC CAPITAL ENGINEERING & RESEARCH
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