Cooling Section Retrofit Technology for Horizontal Furnace Hot-Dip Galvanizing Lines

Technical Overview

In the partial renovation of existing hot-dip galvanizing units, especially in horizontal hot-dip galvanizing units, traditional cooling sections generally have problems such as insufficient cooling capacity, uneven transverse temperature of strip steel, and limited production capacity, especially in the production of high value-added products such as FH all hard steel. This technology integrates three independent innovation achievements: horizontal high-speed cooling mode (with edge to middle temperature control), FH all hard steel insulation mode (constant temperature control), and a fully three-dimensional design+modular supply system.

Application Cases

Applying this technology to the renovation of the cooling section of a horizontal hot-dip galvanizing unit, while maintaining the original length of the cooling section, the production capacity has been increased by more than 30%. At the same time, the temperature uniformity of the product along the width direction has been improved, and FH all hard steel products have been successfully developed. All indicators meet the contract requirements.

Technical Highlights

Cooling section FH full hard steel production mode (strip insulation control): This mode is designed specifically for producing FH full hard steel products. The application of this technology has truly enabled the product line to produce FH all hard steel, a high growth variety, providing key equipment support for customers to seize the high value-added product market.

Horizontal high-speed cooling section (with edge to middle temperature control function): In traditional concepts, transverse temperature control of strip steel (temperature difference control between the edge and middle) has always been the exclusive technology of vertical furnaces. This technology has successfully achieved the dual goals of high cooling capacity and uniform lateral temperature control within a short distance layout of a horizontal furnace, which is an important breakthrough in horizontal cooling technology. This cooling section is fully adapted to the original length of the unit, without the need for extension or renovation, but it brings a production capacity increase of over 30%, fully tapping into the potential of the old production line.

3D design: Based on a unified 3D platform, complete the construction of all professional models including process, mechanical, fluid, and electrical, and achieve collision inspection and virtual assembly for all specialties. Before construction, a "digital factory" simulation can be carried out, greatly reducing unforeseeable work such as on-site drilling, cutting, and rework, and improving installation accuracy and efficiency.

Modular supply: Decompose the key components of the cooling section into standardized transportation and installation modules, complete pre assembly and debugging in the manufacturing plant, and deliver them to the site in a "plug and play" manner. Compared to traditional loose parts supply, the on-site installation cycle is shortened by about 30%, high-altitude operations and hot work points are significantly reduced, and safety and quality consistency are significantly improved.

Application scenarios

Suitable for the renovation and upgrading of the cooling section of existing galvanizing units, especially for production lines that hope to increase production capacity and increase the production capacity of high value-added products such as FH all hard steel without extending the length of the production line or suspending production for a long time. It also applies to the use of modular design and supply mode for newly built units.