WNS LPG Steam Generator Design

Feature 1: Full corrugated furnace

We have developed this new generation of WNS LPG Steam Generators with a unique corrugated furnace design. Our corrugated furnace generates significant flue gas turbulence in the combustion chamber. The corrugated design greatly increases available radiant heat transfer surface area. This larger surface area ensures full contact between the LPG combustion flame and the furnace walls.

We achieve maximum heat release and high-efficiency thermal conversion.The corrugated furnace design provides large margins for thermal expansion and contraction.

The furnace liner expands and contracts freely during high-temperature operation. It relieves built-up internal thermal stresses. Thermal stress relief prevents stress concentrations and structural cracking of pressure-bearing components. Our corrugated furnace design protects pressure-bearing components from thermal fatigue and permanent deformation. It boosts operational safety and extends the service life of our WNS LPG Steam Boilers.

Feature 2: Large steam space

Generates high-quality, stable steam with sufficient internal heating surface for high thermal efficiency.

The boiler’s “wet back” design creates a large internal water and steam space. It maintains plenty of boiling water for continuous steam production. The bigger steam separation zone cuts water droplets in outgoing steam. The boiler delivers consistent steam quality under varying load conditions.

Feature 3: German hinged large-opening smoke box door

Good heat retention; easy opening for internal inspection, soot removal and routine maintenance.

Yongxing LPG steam generator uses an unattached, bolt-secured German-style large opening smoke box door. It delivers reliable sealing and excellent heat retention. It cuts heat loss during operation. The large access opening opens easily for interior inspection, soot removal and routine maintenance. Operators gain direct access to flue and tube areas. It saves time on daily boiler servicing.

Feature 4: High-efficiency threaded smoke tubes

Optimized groove structure enhances convection heat transfer. Heat transfer coefficient is 1.2× higher than standard plain smoke tubes.

The threaded smoke tubes are manufactured using a precise rolling process. Continuous spiraled grooves form on the inside surface. The optimized groove structure disturbs flue gas flow. This boosts convective heat transfer. The heat transfer coefficient is about 1.2 times higher than standard plain smoke tubes. Plain smoke tubes are widely adopted by many German boiler manufacturers. Many German or German boilers use only plain smoke tubes. They do not apply corrugated furnace liners.

The threaded smoke tube delivers better heat absorption. It cuts fuel consumption and lowers your ongoing operating costs. With proper operation and maintenance, the threaded smoke tube achieves an estimated service life of more than 25 years.

Feature 5: Tail waste heat condenser

Finned ND steel / stainless steel tubes recover flue gas waste heat. Overall boiler efficiency exceeds 98% and prevents low-temperature corrosion.

Yongxing boiler uses finned ND steel and stainless steel tubing to recover waste heat in flue gases. These tubes capture excess heat carried by flue gases. Overall boiler efficiency exceeds 98% percent. The design guards against low temperature corrosion of heat exchanger components. It protects tail heating surfaces and extends service life. It delivers reliable high performance during long continuous operation.

Feature 6: Built-in automatic control system

Real-time automatic adjustment of combustion, water level, steam temperature and pressure with full safety interlock protection. [INSERT IMAGE: Boiler control cabinet panel]

LPG steam generator has a built-in automatic control system. The system will monitor a number of parameters in real time (steam pressure, boiler water level, flue gas temperature, exhaust temperature, oil tank level and water tank level). The system will also track communication status and offer multiple languages to allow you to operate it more easily. Automatic control of the oil pump, feed water pump, condensate pump and economizer circulation pump is provided.

In addition, there is a safety interlock function, start-stop output function and alarm output function. When abnormalities occur, the system will trigger an alert. You can view all current faults, check the water level, and change relevant settings via the touch screen.

WNS & LHS Boiler Technical Specification Table

System After Actual Assembly

Complete WNS Boiler System Equipment List

Among these devices, there is one special piece of equipment called a thermal deaerator. Many customers wonder whether they really need to equip a thermal deaerator. Here we provide some application recommendations for your reference.

When Is a Thermal Deaerator Required？

The higher the temperature and pressure in a boiler, the faster it will corrode. This means there is less time for the tubes to be used, and eventually they’ll have to be replaced.

High-temperature and high-pressure operating environments greatly accelerate internal oxidation and corrosion inside the boiler tubes. Long-term corrosion will cause tube thinning, pitting damage, and even affect the overall safety and service life of the entire boiler system.

A thermal deaerator heats up the feedwater to its boiling point to remove both dissolved oxygen (O₂) and carbon dioxide from the feedwater.

Removing these two corrosive gases fundamentally reduces boiler internal corrosion, effectively protects the boiler body and heating tubes, and greatly extends the boiler’s overall service life.

Conditions For Using a Thermal Deaerator 

Most customers do not require a thermal deaerator. But if any of the following cases occur, you need to consider adding a deaerator.

1. Large Boiler Capacity: steam output ≥ 6 t/h steam boiler or hot water boiler with high rated thermal power.
2. High Pressure / Temperature: high design pressure and high steam temperature (≥1.25 MPa or steam temperature above 194℃), strict water quality requirements.
3. High Feedwater Temperature: for models like WNS10/15/20, the feedwater temperature is 104℃, which is the typical operating condition matched with thermal deaerator.
4. Strict Industrial Standards: Food, Pharmaceutical, Chemical Industries Requiring High Purity Of Steam.
5. High Makeup Water Rate And Excessive Oxygen Content: low condensate recovery rate, large raw water supplement, feedwater oxygen content fails to meet standards.

Conditions Where a Thermal Deaerator Is Not Required

– Small low-pressure boiler: (≤6 t/h, working pressure ≤1.0 MPa) with mild corrosion risk under low operating temperature.

– Qualified softened water system: small projects where softened water alone can meet water quality standards.

– Alternative deoxygenation method: qualified chemical deoxygenation or membrane deoxygenation adopted.

Reference standard: GB/T 1576 Industrial Boiler Water Quality. A thermal deaerator shall be equipped when feedwater oxygen content needs to be controlled within limits and thermal conditions are satisfied.

Complete Boiler System 3D Explainer Video

Video reference of Customer’s on-site operation:

We offer customers two methods of delivering their boiler system.

Option 1: Pre-assembled Skid-Mounted Packaged Units

We pre-assemble the boiler unit with all major auxiliary equipment in our factory onto a single steel skid. Once the unit has undergone successful factory testing, we ship the entire unit to your location as a complete module. The only work required at your location is to attach the water pipe connections, gas lines, and electrical wiring. This option significantly reduces the time and expense associated with assembling the unit on-site.

Option 2: Bulk Shipments of Component Parts

We pack the individual components (boiler, auxiliary parts, etc.) into separate containers for bulk delivery. These components will then be sent directly to your project location. Professional technicians will perform complete assembly, pipe fitting and commissioning at your facility after receipt of the shipment. Option 2 is best suited for projects where shipping space is restricted or there are special limitations for entry/exit into the project area.

For other questions, please refer to the FAQ answers below.

Q: Which fuel types does the WNS boiler use? 

A: The WNS boiler uses clean fuels, including liquefied petroleum gas (LPG), natural gas, biogas, and light diesel. A dualfuel burner is available for use with either natural gas or biogas. Coal and biomass cannot be used with this model.

Q: How does the quality of the feedwater affect the performance of the boiler? 

A: You must use softened feedwater in the boiler. Using poorly treated water will cause scale buildup in the tubes. Scale will decrease thermal efficiency and shorten the service life of the boiler. We highly recommend using a water treatment system for every project.

Q: What types of burners can I choose from? 

A: You can select from many well-known burner manufacturers, such as Riello, Baltur, Weishaupt, etc., or their local equivalents. You can also equip your boiler with a low NOx burner to meet strict local emission regulations.

Q: What are some installation and site requirements for this boiler? 

A: This is a packaged fire-tube boiler. Almost all of the assembly process is done at the factory. All that needs to be done at the job site is to connect the pipes, fuel line, and electrical system. The boiler room must have enough room and be properly ventilated. A solid foundation must be installed beneath the boiler to support its weight.

Q: Can you provide certificates for overseas projects? 

A: This is a pressure vessel with a ClassA certificate of boiler manufacture. We can supply you with CE, EAC, and ASME documentation for overseas projects. Once you have finished installing and connecting the boiler, you must get it inspected and registered locally.

Q: What routine maintenance procedures do I need to perform? 

A: You should regularly inspect the smoke box, threaded smoke tubes, and the burner. Regularly clean the soot buildup from the tail economizer. Regularly perform blowdown operations to control the concentration of salts in the water. Properly maintained boilers have been known to last longer than 25 years.

Q: How much can I adjust the load on the WNS boiler?

A: The WNS boiler can adjust from 20% to 100% of its full capacity. The WNS boiler can handle fluctuating steam demand while maintaining consistent steam pressure during partial load operation.

Q: Are there any additional accessories available? 

A: Yes, there are several optional accessories available, including condensers, water softeners, water tanks, fuel tanks, chimneys, safety valves, and PLC remote monitoring systems. Customers choose additional accessories based on the specific conditions at their job site.

Q: What is the typical service life of a WNS steam boiler? 

A: With proper operation and regular maintenance of the feedwater and internal components, the typical service life for a WNS steam boiler ranges from 10 to 25 years.

Q: Are there any safety features included with this boiler? 

A: Yes, there are several safety features included with this boiler, including: low water level shutdown protection; continuous low water level shutdown protection; high steam pressure shutdown protection; and over pressure safety valve protection. This boiler also supports automatic feedwater pump on/off control.

Q: Does your boiler warranty cover damage caused by improper customer operation? 

A: No, our warranty does not cover damage caused by improper customer operation. Our standard warranty covers factory mechanical defects for 12 months from test-run date, or 18 months from shipment date, whichever occurs first. After your warranty expires, we offer lifetime costbased after-sales support.

Q: Who completes the on-site installation and commissioning? 

A: Local professional boiler installation companies complete the on-site installation and commissioning work under the direction and supervision of our engineers. Installation and commissioning typically takes between 1-4 months, depending on the size of the boiler.

Q: What is your production lead time? 

A: Production lead time is 60-90 days, depending on the size of the boiler.

Q: How do I select the right size boiler for my project?

A: First, determine your actual required steam pressure and steam consumption; allow for additional capacity for growth over the next five years. Then determine what types of fuel you will be using. We will recommend the most appropriate boiler solution based upon this information.

Q: What work should buyers do at their job site before delivery of the boiler? 

A: Buyers should prepare civil construction according to our drawings, all steam/feed-water piping connections, power cabling, some feed-water valve connections, and on-site fabrication of chimneys/flue gas ducts. Buyers should also install thermal deaerators if required.