6 million kcal biomass reciprocating grate hot-air furnace
Selecting a grate for a 600 ten-thousand kcal biomass reciprocating-grate hot air furnace means converting the furnace rating into boiler tonnage first and then matching the grate. In conventional hot air furnace duty, this rating corresponds to a grate tonnage of about 10 tonnes.
Tonnage matching
A stepped reciprocating forward-push grate can be designed for a capacity of 300-600 tonnes, but that figure may relate to larger-scale or specific incineration requirements. In conventional hot air furnace duty, the reciprocating grate of the chain-grate type supplied by our partner factory for a 600 ten-thousand kcal hot air furnace usually matches a 10 tonne boiler class. The exact model needs to be confirmed against the manufacturer’s technical parameters.
| Item | Parameter |
|---|---|
| Hot air furnace rating | 600 ten-thousand kcal |
| Stepped reciprocating forward-push grate capacity | 300-600 tonnes |
| Grate tonnage for a conventional hot air furnace | About 10 tonnes |
| Coal boiler matched to the dust collector in the case | 10-30 tonnes |
Case reference
In a gas-fired hot air furnace case in Shandong, the coal boiler tonnage matched to the associated dust collector was 10-30 tonnes, which indirectly suggests that the grate capacity may fall within this range. Actual selection still needs further adjustment according to fuel type, combustion efficiency and grate design, with reference to the manufacturer’s technical documents or verification with the supplier.
Chain grate or reciprocating grate
A chain grate consists of a hopper, front and rear shaft assemblies, grate bars and other parts; the chain carries fuel evenly into the furnace, with little fuel leakage and low draft resistance, running smoothly with relatively little wear. Manufacturing and installation accuracy, however, must be high, otherwise deviation and jamming occur easily. Continuous feed combined with an air preheating system can raise thermal efficiency. Biomass grate selection needs to take account of fuel characteristics, operating requirements and maintenance cost: the chain grate suits continuous stable operation, while the reciprocating grate pays more attention to combustion efficiency but needs relatively frequent maintenance.
