System and method for gravity dust removal and ash discharging of blast furnace

Abstract

The invention provides a system and method for gravity dust removal and ash discharging of a blast furnace. The system comprises a gravity dust collector and a middle ash bin, wherein the gravity dustcollector is connected with the middle ash bin through an ash discharge pipeline, a joint between the ash discharge pipeline and the gravity dust collector is located at the lower part of a grid in the gravity dust collector, and a diffusion pipeline is arranged at the top of the middle ash bin; and a star-shaped cinder valve is arranged on a discharge port in the bottom of the middle ash bin, the bottom of the middle ash bin is connected with a suction and discharge tanker through a nitrogen conveying loop, and the side edge of the middle ash bin is connected with a nitrogen purging and pressure equalizing loop and a nitrogen balance fluidization loop. According to the system and method, by arranging the middle ash bin and arranging the diffusion pipeline, the nitrogen purging and pressure equalizing loop and the nitrogen balance and fluidizing loop on the middle ash bin, the pressure difference between the middle ash bin and the gravity dust collector in the ash discharging processis controlled, and the problems that because existing gravity dust collection gas ash contains blast furnace gas and the blanking pressure difference is large, a pipeline valve is abraded is solved, and the smooth, safe and efficient ash discharging and conveying of gravity dust removal ash materials are achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a system and method for gravitational dedusting and ash removal in blast furnaces. Background technique [0002] In the past, in the traditional way, the discharge of iron-making gravity and dry dust collector dust (gas ash) and vehicle transportation are all open, which will cause serious environmental pollution. In order to cool down and reduce dust, methods such as water spraying and humidification are used, which waste a lot of water resources, and a large amount of sewage treatment is also a problem. [0003] The removal and transportation of ironmaking dust has the following particularities and requirements: [0004] (1) The conveying volume is large and must not be interrupted. The ironmaking blast furnace is a continuous production operation, which continuously produces blast furnace gas and dust removal ash, 1200m 3 After the blast furnace ...

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Problems solved by technology

[0005] (2) High temperature

[0007] (4) Blast furnace dedusting ash has high iron content, is hard, and has angular shapes. In order to make the dedusting ash flow in the pipeline, a certain flow rate must be guaranteed, but at the same time, excessive pressure difference and flow rate will increase the abrasion of the pipeline and equipment

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