The landscape of industrial thermal applications has been fundamentally reshaped by advances in controlled combustion technology. In response to increasingly stringent global emission standards, today’s industry demands multi-fuel flexibility, reduced operational overhead, and fully automated systems.

Ensah is proud to provide high-performance underfeed stoker technology designed to meet these rigorous requirements. The underfeed method utilizes a sophisticated gasification and combustion process to ensure a complete and efficient thermal cycle.

Operational Principles of the Underfeed Stoker

The underfeed stoker ensures smokeless, silent, and high-efficiency combustion across a wide variety of solid fuels, maintaining performance even during partial load fluctuations.

Fuel Delivery System: The system integrates a rotary grate with a high-precision screw feeder. A dedicated dosing chamber delivers fuel in controlled increments, effectively sealing the system to prevent back-drafts or unwanted air intake from the fuel supply side.

Combustion Dynamics: The screw feeder continuously introduces fresh fuel into the base of the stoker. As new fuel enters from below, it pushes the ignited fuel upward into the combustion zone.

Air Distribution: Specialized alloy castings are positioned on both sides of the stoker, housing integrated air boxes. Primary combustion air is delivered through high-velocity nozzles, penetrating the fuel bed for optimal oxygen saturation.

Gasification Process: As the fuel is heated, the upper thermal layer facilitates gasification, releasing volatile gases that are subsequently incinerated. The remaining fixed carbon or coal undergoes stable, sustained combustion on the flat-surface combustion cells.

Configuration Options

To accommodate diverse steam production requirements and site constraints, Ensah offers three primary configurations:

Front Furnace Type

Skirted Type

Semi-Cylindrical (Half-Cylindrical) Type

Key Advantages of the Stoker Combustion System

Labor Efficiency: Achieves up to a 50% reduction in manual labor requirements through automated fueling and control.

Environmental Compliance: Engineered for sustainability, providing exceptionally low carbon and particulate (dust) emission levels.