Mechanical type under-pressure totally-sealed ash discharging process and device

Abstract

Disclosed is a mechanical type under-pressure totally-sealed ash discharging process and device. A hole is formed in a seal head of a concentration ash bin. An ash discharging guide pipe stretches in from the hole to convey ash conveying gas in the ash discharging process to the concentration ash bin through a pipeline, so that the ash conveying gas communicates with a pressure relief pipeline. When the pressure relief pipeline communicates with a low-pressure clean blast-furnace gas main pipe, the ash conveying gas filters ash through a cloth bag in the concentration ash bin under the pressure difference effect of gas of an ash discharging system, and the filtered ash conveying gas enters the low-pressure clean blast-furnace gas main pipe through the pressure relief pipeline to be recycled; the concentration ash bin discharges the ash according to the ash discharging strategy; and the mechanical type under-pressure totally-sealed ash discharging process further comprises a heat preservation step and a step of reverse blowing for ash removing. The mechanical type under-pressure totally-sealed ash discharging process and device have the advantages that the dedusting ash in a conic ash hopper at the bottom of a box body of a blast-furnace drying dust remover can be discharged smoothly through double action of mechanical movement of ash conveying equipment and the pressure difference of the gas of the ash discharging system; and the ash discharging process is smooth, blocking and leakage are avoided, the ash is discharged thoroughly, the equipment failure rate of the ash discharging system is low, maintenance and using are convenient, the operation rate of the box body is high, and the life of the cloth bag is long.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a mechanical pressurized fully enclosed ash unloading process and device. Background technique [0002] The ash unloading process is an indispensable part of the blast furnace gas dry bag dust removal process system. Its main function is to unload the blast furnace dust in the bag box in time to ensure the continuous operation of the dust removal process system. The mechanical pressurized fully enclosed ash unloading process and device can ensure the smooth ash unloading process, smooth ash unloading and no blockage, which plays a very important role in the reliable and efficient operation of the entire dust removal process system. [0003] The semi-clean blast furnace gas from the gravity dust collector or cyclone dust collector (coarse dust removal) is further filtered by the bag filter (fine dust removal) before it can be used by the TRT turbine generator set...

AI Technical Summary

Problems solved by technology

This process has some disadvantages: (1) When a dust collector box unloads ash, another dust collector box must stop the main gas filtration operation and act as a pressure relief box, which reduces the operating rate of the dust collector box ; (2) The centralized ash bin must be installed under the discharge port of the buried scraper machine, which increases the design height of the entire dry dust removal building, and the construction cost of the dry dust removal building is relatively high; (3) The middle ash bin only serves as a pipeline The effect is not significant, but it increases the design height of the dry dust removal building, thereby increasing the project cost

Images