Table 1 The characteristics of various boilers
From: Prime Movers
Types | pulverized coal furnace | grate boiler | spreader stoker | furnace in fluid bed | circulating fluidized bed boiler | cyclone furnace |
|---|---|---|---|---|---|---|
Chemical incomplete combustion loss (%) | 0 | <2 | <1 | ≈0 | ≈0 | 0 |
Mechanical incomplete combustion loss (%) | 2–4 | 5–15 | 6–12 | 5–30 | 2–4 | ≈0 |
Thermal efficiency of boiler (%) | More than 85 | 70–82 | 70–82 | 65–72 | More than 85 | More than 85 |
Rated evaporation (t/h) | ≥35 | ≤35 | ≤35 | ≤35 | ≥35 | ≥75 |
Applicable coal type | Anthracite, bituminous coal, lean coal and lignite | II, III anthracite, II, III soft coal, meagre coal | III anthracite, II,III soft coal, meagre coal, bagasse | Stone coal, lignite coal gangue | Anthracite, soft coal, meagre coal, lignite coal | Soft coal, anthracite, meagre coal |
Load variation adaptability | Can work stably when the rated evaporation is 70% | Can work stably at 50% of rated evaporation, load changes slowly | Variation range of evaporation is extensive, load changes rapidly | Variation range of evaporation is extensive, load changes quickly | Variation range of evaporation is larger, load changes rapidly | Load adjustment range is small, cannot quickly start and stop |