Converter primary exhaust gas dry dedusting coarse ash pneumatic conveying method

Abstract

The invention relates to a converter primary exhaust gas dry dedusting coarse ash pneumatic conveying method. The converter primary exhaust gas dry dedusting coarse ash pneumatic conveying method comprises the following steps of: step one, constructing a converter primary exhaust gas dry dedusting coarse ash pneumatic conveying system; step two, feeding, namely, when a level gauge (3) detects that coarse ash in a lower conical hopper of an evaporation cooling tower (1) reaches an upper limit, giving out a signal, and discharging ash into a bin pump (10); step three, fluidifying, namely, opening an pneumatic ball valve (15), so that nitrogen enters a first fluidization device in the bin pump (10) from a gas storage tank; step four, conveying, namely, opening a second pneumatic double-gate valve (16), so that uniformly fluidized gas-ash mixture is sent to a coarse ash bin (18) through a pneumatic conveying pipe (17); step five, purging; and step six, transporting. The converter primary exhaust gas dry dedusting coarse ash pneumatic conveying method can be used for solving the problem that the height of the evaporation cooling tower is limited during dry dedusting transformation, is particularly suitable for projects of dry dedusting instead of converter primary exhaust gas wet dedusting and has wide application prospect.

Description

Technical field [0001] The invention relates to the field of environmental protection, and more specifically, to a pneumatic conveying method for dust removal and coarse ash of a converter by a dry method of flue gas. Background technique [0002] With the continuous strengthening of environmental protection awareness, the primary flue gas of newly built and renovated converters mostly adopts dry dust removal. The coarse ash collected by the banana bend under the evaporative cooling tower is sent to the coarse ash warehouse in the main plant of the converter through the built-in chain conveyor, pneumatic flapper valve and pneumatic double-layer flap valve under the action of gravity, and is transported by automobile after being humidified. [0003] The main problems of the existing converter primary flue gas dry dust removal coarse ash conveying system: first, the built-in chain conveyor has a high failure rate and frequent ash jams, which seriously affects the normal production of...

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Problems solved by technology

[0003] The main problems of the existing converter primary flue gas dry dedusting coarse ash conveying system are as follows: first, the built-in chain conveyor has a high failure rate and often gets stuck, which seriously affects the normal production of the converter; second, the coarse ash bin is located in the main workshop of the converter In the interior, it is often restricted by the layout conditions of the steelmaking process, and the ash transportation channel for the car to enter and exit must be considered, which takes up a lot of indoor space; third, the coarse ash is not uniformly humidified, resulting in dust everywhere during ash unloading, polluting the environment

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