Reviewing the Old to Discover the New (Series 20)

⑴Increase temperature without mentioning hydrogen; increase hydrogen without mentioning temperature； ⑵Low-temperature reduction ； ⑶Low-hydrogen reduction ； ⑷Low water vapor temperature ； ⑸High airspeed.

It is essential to strictly control the reduction temperature and carry out hydrogen preparation carefully

The oxygen content in semi-water gas must be kept below 0.5%. During the heating phase, the hotspot temperature must not exceed 2200°C, and the outlet temperature must not be lower than 1500°C. During the initial sulfidation stage, the hotspot temperature must not exceed 3500°C, and this condition should be maintained for a sufficient period to ensure low-temperature penetration. The amount of CS2 added must be carefully controlled, increasing it gradually from small amounts. If a sudden rise in furnace temperature is observed, the addition of CS2 should be stopped immediately. Water is generated during the sulfidation process; therefore, the space velocity should be increased as much as possible to remove the water vapor. When it is difficult for the gas to penetrate the lower section, CS2 can be directly added to the second section from the outlet of the electric furnace.

Due to the large amount of heat released during the reduction reaction, there are many cases in industrial production where catalysts are damaged as a result of careless reduction operations, resulting in a shortened lifespan. Therefore, it is essential to strictly control the reduction temperature and carry out hydrogen preparation carefully