Export to Afghanistan: ZOZEN Boiler 25 tph Coal-Fired Steam Boiler for the Paper Industry

An Afghan paper mill introduced a ZOZEN SZL series 25 t/h coal-fired steam boiler to provide a stable heat source for the paper machine dryer cylinders and pulping processes. Guided by a “larger capacity, higher cost-effectiveness” configuration strategy, the project achieved strong results in fuel adaptability, combustion efficiency, and execution assurance: thermal efficiency >81%, friendly multi-coal switching, engineers stationed on site for installation guidance, and a comprehensive documentation and training system—helping the customer achieve rapid production ramp-up and sustained, steady operation.

Industry Perspective: Key Steam Requirements for Papermaking

Continuous, stable steam supply: Dryer cylinders are sensitive to steam pressure and quality; fluctuations directly affect basis weight, smoothness, and sheet moisture.
Economics and availability: Regional fuel supply is uneven; equipment must accommodate multiple coal types to reduce fuel costs and supply risks.
Energy efficiency and maintainability: Efficient heat transfer, complete combustion, and a standardized O&M system are the foundation for lowering steam consumption per ton of paper over the long term.
Project execution capability: Cross-regional projects depend more on clear milestone management, on-site oversight, and complete documentation to shorten the path from installation to full production.
Key Technologies and Configurations

Broad fuel adaptability:
Compatible with bituminous coal, lean coal, anthracite, and other coal types, flexibly responding to local fuel supply and quality fluctuations.
Sufficient combustion design:
Chain grate with independent air chambers and zoned air distribution; precise air control ensures more complete combustion, improving thermal efficiency and combustion stability.
High-efficiency heat transfer structure:
Furnace with closely arranged water-cooled walls, paired with a customized boiler system solution to expand the radiant heating surface; overall boiler thermal efficiency >81%.