Pneumatic conveying method for removing dust and crude ash in dry process of converter once flue gas

Abstract

The invention relates to a pneumatic conveying method for removing dust and crude ash in a dry process of converter once flue gas. The method comprises the following steps of S1, constructing a pneumatic conveying system for removing dust and crude ash in the dry process of converter once flue gas; S2, feeding: a signal is sent when a material level meter (3) detects crude ash in a lower funnel of an evaporative cooling tower (1) reaching an upper limit, ash is discharged into a cabin pump (10), and a vibrating and striking device (2) works; S3, fluidization: a pneumatic ball valve (15) is started, nitrogen enters into a first fluidization device in the cabin pump (10) from a gas storage tank (14); S4, conveying: after a second pneumatic double-gate plate valve (16) is opened, the uniformly fluidized gas and ash mixture is conveyed into a crude ash cabin (18) through a pneumatic conveying pipe (17); S5, blowing and sweeping, and S6, moving by transportation. By adopting the method, a common ash transportation cart can be used for transporting ash, the investment is greatly lowered, and the cost is saved. The method solves the problem that the height of the evaporative cooling tower is limited during the transformation of dust removal in the dry process, the method is particularly suitable for the project that dust removal of once flue gas in a converter via a wet process is transformed into a dry process, and the method has wide application prospect.

Description

technical field [0001] The invention relates to the field of environmental protection, and more specifically relates to a method for pneumatically conveying coarse ash of converter primary flue gas dry dedusting. Background technique [0002] With the increasing awareness of environmental protection, the primary flue gas of newly built and rebuilt 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 bin in the main converter building under the action of gravity through the built-in chain conveyor, pneumatic flap valve and pneumatic double flap valve, and then transported outside by car after humidification. [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; secon...

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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 Inside, it is often restricted by the layout conditions of the steelmaking process, and the ash transportation channel for the car to enter and exit should be considered, which takes up a lot of indoor space; the third is that the price of each vacuum suction tanker is about 1 million yuan, and the investment is relatively high.

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