List of main auxiliary equipment of 4 ton steam boiler

Boiler Main Components

• Drum
  – Fabricated pressure vessel (e.g. horizontal shell type).

• Evaporators / Steam Separators
  – Primary and secondary evaporator banks to promote water–steam separation.

• Economizer
  – Tube bundle recovering flue‐gas heat to preheat feedwater.

• Superheater (optional)
  – Increases steam dryness and temperature if required by process.

Auxiliary Equipment

Combustion & Air Supply

• Burner
  – Sized for fuel type (gas, oil, coal) and boiler firing rate.

• Forced‐draft Fan (FD)
  – Supplies combustion air; sized to match burner throughput.

• Induced‐draft Fan (ID)
  – Draws flue gas through furnace and exhaust stack.

Feedwater & Drainage

• Feedwater Pump(s)
  – Typically two pumps (one duty, one standby), e.g. QDL12-70 or similar.

• Steam Traps / Drain Traps
  – Automatic traps (2–4 units) to discharge condensate from heat‐transfer surfaces.

• Steam Distributor / Header
  – Ensures even steam distribution to process lines.

Safety & Measurement Instruments

• Safety Valve(s)
  – Spring‐loaded, set slightly above maximum working pressure (one or two units).

• Pressure Gauges
  – For steam and feedwater sides (range matched to operating pressure).

• Water‐Level Gauge Assembly
  – Glass tube or magnetic gauge with high/low level alarms.

• Thermocouples / Thermometers
  – Measure furnace gas temperature and steam outlet temperature.

Control & Automation

• Burner Management System (BMS)
  – Controls ignition, flame monitoring, and safe shutdown sequences.

• PLC Control Panel
  – Centralized monitoring of all boiler parameters, alarms, and interlocks.

• Sensors & Transmitters
  – Pressure transducers, temperature sensors, flow meters, and level probes.

Piping & Valves

• Control / Modulating Valves
  – For steam pressure reduction, temperature control, and fuel/air ratio.

• Blowdown Valves (TDS Blowdown)
  – Periodic removal of dissolved solids (one or two valves).

• Check Valves
  – Prevent backflow in feedwater, steam, and condensate lines.

• Isolation Valves
  – Gate valves, globe valves, and ball valves for system shutdown and maintenance.

Water Treatment

• Water Softener
  – Ion‐exchange resin system with duplex (one service, one regenerating).

• Deaerator
  – Thermally strips dissolved gases (oxygen, carbon dioxide) from feedwater.

• Filters
  – Cartridge or sand filters to protect pumps and valves from particulates.

Miscellaneous Accessories

• Silencers
  – Installed on flue‐gas outlets of ID/FD fans to reduce noise.

• Installation Fittings
  – Flanges, gaskets, bolts, nuts, anchors, supports.

• Thermal Insulation
  – Mineral wool or ceramic fiber with aluminum cladding for piping and boiler casing.

The above is a list of common steam boiler accessories. I hope it helps you. Of course, you can also contact us and we will help you.