The Two-Pass Condensing Low NOx Gas Steam Boiler is a fully automatic industrial steam boiler designed to deliver high-efficiency saturated steam while reducing fuel consumption and NOx emissions. Suitable for continuous-process industries, it combines a compact two-pass wet-back structure with condensing heat recovery for new installations and boiler replacement projects.
Key Commercial Advantages
Wet-Back Pressure Vessel Construction
The fully water-cooled rear chamber eliminates refractory maintenance while improving long-term structural reliability.
Corrugated Furnace Design
The corrugated furnace absorbs thermal expansion during repeated heating cycles while increasing radiant heat transfer.
316L Stainless Steel Condensing Economizer
Acid-resistant stainless steel tubes improve corrosion resistance under low flue gas temperatures and extend economizer service life.
Intelligent Boiler Control
PLC-based automatic control manages burner sequencing, feedwater operation, pressure regulation, alarm monitoring, and remote communication.
Parameter
|
Model |
Rated evaporation rate(t/h) |
Rated Working Pressure(MPa) |
Saturated SteamTemperature(℃) |
Thermal Efficiency(%) |
Natural gas consumption(m³) |
Shipping Weight(t) |
|
NWNS1-1.0-Q |
1 |
1.0/1.25/1.6 |
184/194/204 |
103.2 |
76.2 |
5.7 |
|
NWNS1.5-1.0-Q |
1.5 |
1.0/1.25/1.6 |
184/194/204 |
103.2 |
114.6 |
6.5 |
|
NWNS2-1.0-Q |
2 |
1.0/1.25/1.6 |
184/194/204 |
103.1 |
152.8 |
8.3 |
|
NWNS3-1.25-Q |
3 |
1.0/1.25/1.6 |
184/194/204 |
103.2 |
229.2 |
9.1 |
|
NWNS4-1.25-Q |
4 |
1.0/1.25/1.6 |
184/194/204 |
103.2 |
305.3 |
12.1 |
|
NWNS6-1.25-Q |
6 |
1.0/1.25/1.6 |
184/194/204 |
103.2 |
458.2 |
15.2 |
|
NWNS8-1.25-Q |
8 |
1.0/1.25/1.6 |
184/194/204 |
103.2 |
611 |
18.6 |
|
NWNS10-1.25-Q |
10 |
1.0/1.25/1.6 |
184/194/204 |
101.4 |
762.4 |
21.3 |
|
NWNS15-1.25-Q |
15 |
1.0/1.25/1.6 |
184/194/204 |
101.2 |
1145.5 |
32.5 |
|
NWNS20-1.25-Q |
20 |
1.0/1.25/1.6 |
184/194/204 |
101.3 |
1527.3 |
38.6 |
Customization Options
|
Item |
Available Options |
|
Steam Capacity |
1–20 t/h |
|
Working Pressure |
10 / 12.5 / 16 bar |
|
Fuel Type |
Natural Gas, LPG, City Gas |
|
Burner Brand |
Riello, Baltur, Weishaupt, Ecoflam |
|
PLC System |
Siemens / Mitsubishi |
|
Communication Protocol |
Modbus RTU, Modbus TCP, Ethernet |
|
Power Supply |
220V / 380V / 415V / 440V |
|
Feedwater System |
Standard or Complete Water Treatment Package |
Manufacturing & Quality Control
Raw material identification with mill certificates (MTC)
Automated SAW welding for pressure components
100% RT/NDT inspection on pressure welds
Hydrostatic pressure testing before shipment
Burner commissioning and full-load operational testing
Final quality inspection with complete factory records
Packaging & Delivery
Export Packaging
Steel skid mounting with moisture-proof wrapping suitable for container or breakbulk shipment.
Shipping Documents
Packing list, commercial invoice, GA drawings, electrical drawings, pressure test reports, operation manual, and spare parts list.
Optional Services
Container loading supervision, overseas installation guidance, commissioning support, and operator training.
Why Partner With Us
Manufacturing Scale: 160-acre facility with 69,000 m² production workshops and over 300 precision processing units.
Compliance & Licensing: Holds ASME, CE certifications, and Class A2 pressure vessel manufacturing licenses.
Global Footprint: Equipment installed in 70+ countries with regional service branches in Vietnam and Indonesia.
FAQ
Q: How do I choose the right steam capacity for my factory?
A: Steam capacity depends on your hourly process steam consumption, operating pressure, peak production demand, and future expansion plans. Our engineers can calculate the required boiler size based on your production data.
Q: Can this boiler replace an existing three-pass steam boiler?
A: Yes. The compact two-pass structure is suitable for many boiler replacement projects where installation space is limited. Existing piping and utility connections can often be reused after site evaluation.
Q: What utilities are required before installation?
A: Typical site requirements include a gas supply, treated boiler feedwater, electrical power, chimney system, drainage, and adequate ventilation. Foundation drawings are provided before shipment.
Q: How often does the condensing economizer require maintenance?
A: Routine inspection mainly involves cleaning heat-transfer surfaces and checking condensate drainage. Maintenance intervals depend on fuel quality, operating hours, and local water conditions.
Q: What is the expected service life of the boiler?
A: With proper water treatment, scheduled maintenance, and normal operating conditions, industrial steam boilers are commonly designed for long-term continuous service over many years.
Q: Can the boiler operate together with existing boilers?
A: Yes. Multiple boilers can be configured for cascade operation to match varying steam demand, improve energy efficiency, and provide operational redundancy.
Q: What factors affect natural gas consumption?
A: Fuel consumption is influenced by steam load, operating pressure, feedwater temperature, combustion tuning, insulation quality, and daily operating hours. We can estimate annual gas consumption based on your application data.
Q: How long does installation and commissioning typically take?
A: Installation time varies with boiler size and site conditions. For most industrial projects, mechanical installation and commissioning are completed within several days after utilities are ready.
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