Equipment Outline

There are both dry and wet methods for producing acetylene from calcium carbide. Because the amount of water used in the reaction for the wet method is 12-13 times the theoretical yield, the acetylene slag comes in a sludge form and is difficult to handle. Using the dry method, acetylene slag can be obtained in a dry powder form with a moisture content of 5-7%, so it can be directly packed in a bag or receptacle and sold as is. The dry method is further separated into a small-scale inclined method (100-300Nm3/H), which uses 80-150mm lumps of carbide, and a vertical method (500-1250Nm3/H), which uses powdered carbide that is 3mm or smaller.

Equipment Characteristics

The system uses carbide feedstock that has been pulverized to a size 3mm or smaller. A seal tank is provided to the preceeding process that supplies the generator, and the generator-side pressure is sealed from the atmospheric side by a material seal as the feedstock is continuously fed into the generator, so the feedstock supply is completely automated.

Feedstock enters the seal tank, and the level of the powder is kept constant to avoid backflow of acetylene from the generator side as the powder enters the generator through the feed screw.

The structure of the generator includes multi-leveled disc-shaped racks and a rotating scraper blade contained within a vertical, cylindrical case. Above the first disc rack there is a water shower, and the water released by this makes contact with the carbide, causing it to react as it is dropped down to the bottom level by the scraper blade, eventually forming acetylene slag (slaked lime).

The byproduct slag shuts off the acetylene atmosphere from the outside atmosphere as it passes through the slag discharger on its way out of the system. Additionally, it is possible to process the scrap carbide and powdered carbide from the carbide manufacturing plant.

Generated C2H2 gas enters the dedusting cooling tower where all dust that was generated inside the generator is removed and the gas is cooled to ambient temperature before being transported to the gas holder at the generator pressure.