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| Category | Accessory Name | Function | Common Materials | Applicable Boiler Type | Key Parameter Examples |
| Combustion System Accessories | Burner | Atomizes fuel and mixes it with air for combustion to provide heat for the boiler | Stainless Steel, Alloy | Gas - fired Boiler, Oil - fired Boiler | Power: 5 - 500kW, Fuel Type Compatibility |
| Grate | Carries coal and realizes coal layer advancement and ash/slag discharge | Cast Iron, Heat - Resistant Steel | Coal - fired Layer Combustion Boiler | Grate Width: 1 - 5m, Chain Speed: 0.5 - 3m/min | |
| Steam - Water System Accessories | Boiler Drum | Collects, stores, purifies steam, supplements feed water, with built - in steam - water separation and blowdown devices | Carbon Steel, Alloy Steel | Water - Tube Boiler | Diameter: 0.8 - 2m, Wall Thickness: 20 - 50mm |
| Water - Cooled Wall Tube | Absorbs radiant heat from the furnace, evaporates water into a steam - water mixture, and protects the furnace wall | Carbon Steel, Heat - Resistant Alloy Tube | Furnaces of Various Boilers | Pipe Diameter: φ51 - φ89mm, Wall Thickness: 5 - 10mm | |
| Superheater | Heats saturated steam into superheated steam to improve work capacity | Heat - Resistant Alloy Steel | Steam Boiler | Outlet Temperature: 400 - 550ºC, Pressure: 1 - 10MPa | |
| Valve Accessories | Safety Valve | Automatically discharges gas when the boiler is overpressured and closes when pressure drops to prevent explosion | Stainless Steel, Carbon Steel | Various Pressure - Bearing Boilers | Nominal Pressure: 0.6 - 6.4MPa, Nominal Diameter: DN15 - DN200 |
| Globe Valve/Gate Valve | Cuts off or connects the steam - water path | Cast Iron, Carbon Steel, Stainless Steel | Pipelines of Various Boilers | Nominal Diameter: DN15 - DN300, Working Temperature: ≤425ºC | |
| Instrument Accessories | Pressure Gauge | Measures the pressure inside the boiler to ensure operation within the allowable range | Copper, Stainless Steel | Various Boilers | Range: 0 - 1.6MPa, Accuracy Class: 1.6 |
| Water Level Gauge | Displays the water level in the drum to prevent water shortage or overflow | Glass, Stainless Steel | Drum - Type Boiler | Visible Range: 0 - 300mm, Connection Method: Flange | |
| Auxiliary Equipment Accessories | Feed Water Pump | Delivers feed water into the boiler to meet the feed water demand | Cast Iron, Stainless Steel | Various Boilers | Flow Rate: 5 - 200m³/h, Head: 20 - 100m |
| Fan | Forced draft fan delivers air, induced draft fan discharges flue gas to maintain negative pressure in the boiler | Carbon Steel, FRP | Various Boilers | Air Volume: 1000 - 100000m³/h, Wind Pressure: 500 - 5000Pa |
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