1. Product Overview This natural gas straight-line hot-dip galvanizing production line features a zinc kettle with internal dimensions of 13m×1.5m×3.5m, 420-ton zinc capacity, and maximum hourly capacity of 18 tons/hour. The line covers the full process of pre-treatment (pickling, rinsing, fluxing), galvanizing, cooling, passivation, and exhaust gas treatment. It uses natural gas micro-positive pressure heating and incorporates a cascade flue gas waste heat utilization system