Full Hydrogen Bell Annealing Furnace: Energy-Efficient Heat Treatment Solution by Trusted China Suppliers & Factory
Product Introduction
The configuration ratio between the furnace and the heating cover is reduced. The traditional HNX furnace is 2:1, that is to say, two HNX furnaces are equipped with one heating cover. The ratio of the furnace cover is reduced to 1.6:1 due to the extremely short cooling time of the all-hydrogen furnace, which saves the floor area and reduces the investment.
The use of 100% hydrogen as a protective gas, corrugated inner casing, large gas flow and high speed burner, combined gas/water cooling and strong convection can increase production by 30% to 40%.
No oxidation phenomenon — due to the realization of reliable two PPm level (millionth) of the seal, sufficient washing time and advanced control means, annealed steel coil will not have oxidation color.
Frequently Asked Questions
The traditional HNX furnace uses a 2:1 ratio, meaning two furnaces share one heating cover. The improved 1.6:1 ratio is made possible by the significantly shorter cooling time of the all-hydrogen furnace, which reduces floor space requirements and lowers overall capital investment.
Hydrogen offers superior thermal conductivity compared to nitrogen or mixed gases. Using 100% hydrogen, combined with a corrugated inner casing, high-speed burners, and strong convection cooling, dramatically improves heat transfer efficiency and enables production increases of 30% to 40%.
PPm (parts per million) level sealing means the furnace maintains an extremely low oxygen content within its atmosphere — measured at the millionth level. This near-zero oxygen environment, combined with adequate purging time, ensures the steel coil surface remains completely free of oxidation discoloration after annealing.
The combined gas/water cooling system accelerates the cooling phase of the annealing cycle significantly. This rapid cooling not only shortens total cycle time but also allows a single heating cover to service more furnaces within the same timeframe, directly contributing to the improved 1.6:1 configuration ratio.
No — in fact, the all-hydrogen furnace requires less floor space. Because the cooling cycle is much shorter, fewer furnaces are needed to match the same output level, and the reduced 1.6:1 configuration ratio means fewer heating covers are required, resulting in a more compact and cost-effective plant layout.
The corrugated inner casing increases the effective surface area for heat exchange within the furnace. This enhanced geometry promotes more uniform heat distribution and improves the efficiency of the hydrogen gas circulation, contributing to faster heating and cooling cycles and ultimately supporting the 30–40% production increase.