A zinc dust filtration system and method

By designing a zinc ash filtration system, high-temperature cooling, multi-stage purification, and closed-loop atmosphere circulation were achieved, which solved the shortcomings of traditional zinc ash treatment methods, improved production continuity and the surface quality of galvanized sheets, and saved on protective atmosphere consumption.

CN122273203APending Publication Date: 2026-06-26DALIAN SHENGGUANG TECH DEV CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN SHENGGUANG TECH DEV CO LTD
Filing Date
2026-04-23
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Traditional zinc ash treatment methods are prone to damaging filter media under high-temperature atmospheres, and filter blockage requires shutdown and replacement. They lack automatic switching functions, cannot monitor filtration efficiency online, and the purified atmosphere is not returned, resulting in waste of protective atmosphere.

Method used

Design a zinc ash filtration system that employs an exhaust pipeline, cooling device, multi-stage filtration unit, heater, and dust monitoring device to achieve high-temperature cooling, multi-stage purification, automatic switching, and closed-loop atmosphere circulation. The system includes a finned cooler, a Roots blower, multi-stage filters, and a dust detection device to achieve automatic switching and full-process monitoring without production interruption.

Benefits of technology

It improves the cooling efficiency and filtration accuracy of the zinc ash filtration system, reduces zinc particle defects, extends the zinc ash cleaning cycle, enhances production continuity and the surface quality of galvanized sheets, and saves on protective atmosphere consumption.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a novel zinc ash filtration system and method, relating to the technical field of hot-dip galvanizing production lines in metallurgy. It includes a fan, a finned cooler, a coarse filter, a precision filter unit, a differential pressure sensor, a heater, and dust detection devices before and after filtration. The fan provides suction, drawing high-temperature zinc ash-containing atmosphere from the middle section of the furnace nose. The finned cooler cools the 700°C gas to 40°C before it sequentially enters the coarse and precision filters. The precision filter unit is equipped with a differential pressure sensor; when a differential pressure alarm occurs, it automatically switches to a backup filter unit, achieving uninterrupted production. The filtered gas is heated by the heater and returned to the thermal expansion chamber in the furnace area, forming a closed-loop circulation. The dust detection device monitors the dust concentration before and after filtration in real time. This invention features high cooling efficiency, high filtration accuracy, online automatic switching, and full-process monitoring, significantly improving the problem of zinc ash accumulation at the furnace nose and enhancing the surface quality of galvanized sheets. It is suitable for continuous hot-dip galvanizing and continuous annealing production lines.
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