Three-pass steam boiler

Name: Three-pass steam boiler
Brand: TSB Energy

Scotch-type fire-tube boiler for industry: up to 30 000 kg/h of steam at pressures up to 25 bar

Boilers and Equipment

TSB Energy

≤ 30 000 kg/h
≤ 21 000 kW
≤ 25 bar
24–720 h unattended

TSB Energy's three-pass steam boiler is a Scotch-type fire-tube design. The burner flame forms the first pass inside a large corrugated furnace; the flue gas then runs through two separate banks of smoke tubes before reaching the stack. According to TSB, 55 % of the energy passes to the water in the furnace itself. The boiler fires natural gas, LPG, LNG, diesel and heavy fuel oil, and can burn up to 100 % hydrogen with a suitable burner. Output reaches up to 30 000 kg/h of steam (up to 21 000 kW) at pressures up to 25 bar.

At 8 bar, efficiency is 90–92 % without an economiser and 94–96 % with one; optional aluminium turbulators in the smoke tubes add 1.5 % combustion efficiency. With clean combustion, NOx stays below 70 mg/Nm³ on gas and below 150 mg/Nm³ on oil. Shell and tube plates are P355GH boiler plate (EN 10028-2), and nozzle pipes are seamless P235GH or P265GH tube (EN 10216-2); design and manufacture are based on EN 12953, PED 2014/68/EU, TRD and ASME VIII Div. 1.

The boiler comes on a single skid, ready to run: it can be commissioned once power, feedwater and the steam line are connected. A PLC supervises every safety device and the operator runs the boiler from an HMI panel; alarm and run signals leave via dry contacts, while remote data is available over Modbus, Modbus TCP/IP and Profinet. The SB-Special series, with extended instrumentation, is equipped to run without staff on site in line with EN 12953, and it stops and locks out automatically if a limit is exceeded.

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Benefits

Three-pass steam boiler

Unattended operation for 24 to 720 hours cuts staffing and running costs
Large evaporation surface and steam space to meet sudden steam demand
Front doors open onto the smoke tubes, a rear explosion door onto the reversal chamber, and a manhole plus at least two handholes onto the water side
Wetback or dryback design
At least 2 % less fuel than standard boilers, as narrower furnace and tube diameters speed up the flue gas
100 mm high-density door insulation and galvanised, painted outer cladding keep radiation losses low
CO₂ emissions can be cut by firing up to 100 % hydrogen with a suitable burner
UL-labelled electrical components, with wiring to the National Electrical Code (NEC)

TSB Energy

Key specifications

Specification	Three Pass Steam Boiler
Steam output	≤ 30 000 kg/h
Thermal capacity	≤ 21 000 kW
Operating pressure	≤ 25 bar
Efficiency	At 8 bar: 90–92 % (without economiser) · 94–96 % (with economiser)
Fuel types	Natural gas, LPG, LNG, diesel, heavy fuel oil, H₂ (up to 100 % with a suitable burner)
Unattended operation	24–720 h
NOx emissions	Clean combustion: < 70 mg/Nm³ (gas firing) · < 150 mg/Nm³ (oil firing)
Design	3-pass Scotch type; wetback or dryback
Material	Shell and tube plates: P355GH (EN 10028-2) · nozzle pipes: P235GH / P265GH (EN 10216-2)