Treatment and Utilization Methods of Non-Condensable Gas (NCG) from Batch-Type Pyrolysis Process

Treatment and Utilization Methods of Non-Condensable Gas (NCG) from Batch-Type Pyrolysis Process

The non-condensable gas generated in the batch-type waste tire pyrolysis process is mainly treated based on the principle of resource recovery and utilization, with supporting safe disposal schemes. The specific methods are as follows:

On-site recycling as fuel

This is the most core and economical utilization method. After undergoing desulfurization and dehydration pretreatment to remove corrosive hydrogen sulfide and moisture, the NCG is directly delivered to the external heating chamber of the pyrolysis reactor and burned as the primary fuel to supply energy, providing the core temperature of 450–550℃ required for the waste tire pyrolysis reaction. This method can replace external fuels such as diesel and natural gas, significantly reducing the project's operation costs and realizing the internal recycling of by-products.

Compression, liquefaction and external sales

When the NCG output exceeds the on-site fuel demand, the pretreated gas can be compressed and liquefied to produce liquefied petroleum gas (LPG)-like products, which are sold externally as industrial fuel gas to expand the project's revenue channels. This method requires supporting gas compression, liquefaction and storage equipment, and is suitable for large-scale pyrolysis projects with stable output.

Safe incineration via torch system

For the small amount of surplus NCG generated under special conditions such as equipment startup/shutdown and working condition fluctuations, or unqualified gas that cannot be recycled, it can be connected to the supporting torch system for full combustion before discharge. This method can avoid safety hazards caused by direct emission of combustible gas, and the flue gas after combustion must be sent to the flue gas purification system for desulfurization, denitrification and dust removal before reaching the emission standards.