ND Steel Advantages

ND steel is the most ideal steel for "withstanding low-temperature dew point corrosion" both domestically and internationally, widely used in the manufacture of economizers (energy savers) that operate in high-sulfur烟气, air preheaters, heat exchangers, and evaporators, etc., to resist dew point corrosion caused by sulfur-containing烟气. ND steel also exhibits resistance to chloride ion corrosion. The main assessment criteria for 09CrCuSb (ND steel) seamless steel tubes/plates (soaked in a 70° 50% H2SO4 solution for 24 hours) show a corrosion rate not exceeding 14mg/cm²·h, which is 1.84 times that of Japan's CR1R steel, 2.97 times that of 1Cr18Ni9 steel, 8.63 times that of Corten steel, and 14.11 times that of Q235B steel when compared to carbon steel, imported Japanese steel of the same type, and stainless steel in terms of corrosion resistance. ND steel's superior performance in withstanding dew point corrosion and its very high cost-performance ratio make it a perfect substitute for stainless steel and the best material to surpass stainless steel in terms of dew point corrosion resistance. ND steel holds significant economic importance and aligns with today's "green" concepts of high efficiency, longevity, energy conservation, and environmental protection, as well as the national development policy orientation. Comparison of 09CrCuSb steel (ND steel) with other steel grades.

Steel Grade    09CrCuSb (ND Steel)    CRIR (Japan)    1Cr18Ni9    Corten    S-TEN (Japan)    A3 (Q235B)

Corrosion Rate    7.30    13.40    21.70    63.00    27.4    103.50

Multiple 1    1.84    2.97    8.63    3.75    14.11

Note: Corten steel, also known as Weathering steel, is divided into two main categories: Corten A and Corten B. It represents the Cu-P series steel in the United States and is a low-alloy, high-strength steel that resists atmospheric corrosion, known as weather-resistant steel in China.

Performance Introduction

Design Reasonable: Horizontal internal combustion three-pass full-wet back design, 100% corrugated furnace tube. Excellent thermal expansion properties. Integrated water包围fire design, ample heating surface area and rational structural arrangement, ensuring high efficiency operation of the boiler.

Manufacturing Standards: The company has established a comprehensive quality assurance system that operates reliably, ensuring the entire manufacturing process is strictly controlled and supervised by a special inspection agency on-site.

High Efficiency Energy Saving: The thermal efficiency of our steam and hot water boiler series ranges between 92%-99.8%. The large combustion chamber, combined with rational structural arrangement, allows for more heat to be transferred into the water, significantly enhancing the heat exchange capabilities between fuel-steam and fuel-hot water.

Meets environmental protection standards: Large combustion space, fully utilizing radiant heat exchange, and equipped with high-quality and reliable imported burners, ensuring complete combustion of the fuel and significantly reducing the emission of harmful components in flue gas. Our company's fuel (gas) steam and hot water boilers have passed legal department testing and comply with national environmental protection requirements, making them ideal eco-friendly products.

High heating quality: Steam boilers feature ample steam storage capacity, ensuring high-quality dry steam under conditions of significant load fluctuations.

Superior Configuration: Equipped with world-renowned burners, advanced control systems (main components are imported), valves, and pumps all utilize national quality products. The excellent boiler accessory configuration strongly ensures the safe operation of the boiler.

Fully Automatic Operation: Simply press the start button, and the boiler will run according to the programmed settings. Load regulation, water supply, and other processes are all fully automated, requiring no constant supervision.

Long service life: The professional design of our boiler products, advanced production technology, and high-quality boiler steel ensure that the normal lifespan of the boiler body is over 15 years.

Maintenance and repair are convenient: The boiler is equipped with movable ash box doors at both front and back, with observation and inspection holes at the rear, allowing for easy access into the furnace for inspection and cleaning. A manhole is also provided on the boiler body, with the structural design taking into account ease of maintenance and repair in the future.

Product Description:

WNS fuel (gas) steam and hot water condensing boilers, with external integrated finned tube economizers, independent condensers, compact structure, and easy maintenance, offer significant energy-saving effects. The thermal efficiency exceeds 100% based on the lower heating value of the fuel. To meet customer requirements, programmable logic controllers (PLCs) can be combined with touchscreens and additional buttons for a dual-path intelligent control system, which can also be pre-wired for remote control.

The WNS series fully automatic oil (gas) steam boilers (utility model patent) feature a horizontal three-pass wet-back structure, improving the boiler operating environment and enhancing efficiency and lifespan; all flue gas channels are submerged in water, equipped with a surplus hot water tank and a complete insulation jacket design. The smoke box is sealed with a labyrinth structure, preventing smoke leakage. The boiler's thermal efficiency exceeds 85%, utilizing a combination of a corrugated furnace tube with good expansion properties and a conical furnace tube, where the furnace tube size matches the flame, reducing the flue gas flow area sequentially to ensure uniform flow and maximize the heat exchange time of high-temperature flue gas inside the boiler for better heat transfer. A high-performance burner perfectly matched with the boiler is used for comprehensive automatic regulation, ensuring complete combustion, fuel savings, and reduced pollution. Ultra-fine glass wool with high insulation properties is used to minimize heat loss. An intelligent energy-saving control system is adopted to control the boiler and steam (water) supply system, adjusting fuel supply based on different loads for greater energy efficiency. The installation method is an integrated quick assembly boiler, with minimal vibration, no special foundation requirements, and no need for anchor bolts, making it simple and easy to install. The movable furnace head structure can be matched with various burners, allowing for quick replacement of the furnace head and convenient maintenance of the furnace body. The front and rear smoke boxes use a removable design, enabling easy inspection, maintenance, and care of the boiler interior. The product design is innovative, the structure is reasonable, and the process performance is good, making the product stand out with superior quality.

Product Features:

The design, manufacturing, and supervision of the boiler strictly adhere to the "Regulations for Safety Supervision of Steam Boilers," JB/T 10094-2002 "General Technical Conditions for Industrial Boilers," and JB/T 1619-2002 "Technical Conditions for the Manufacturing of Shell Boilers," ensuring long-term safe and stable operation of the boiler.

2. The body features a pot shell-type full-wet back downstream three-pass smoke tube structure. The flame burns micro-positively in the large combustion chamber, fully extending with low combustion heat load and minimal NOx emissions.

3. Wave-shaped furnace tube and threaded flue structure, which enhances strength while meeting the expansion requirements of each part.

4. The main welds are all joined by butt joints and have been inspected for non-destructive testing with X-rays and ultrasonic methods, ensuring the welding quality meets national standards.

5. The boiler has a large water volume and gas space, with strong load adaptation capability. The design of the internal equipment ensures that the steam moisture content is below 4%, meeting the higher requirements of users for steam quality.

6. Utilizes advanced thermal insulation materials, featuring lightweight construction, minimal heat loss, and excellent保温 performance.

7. The water level alarm uses stainless steel as the electrode rod and polytetrafluoroethylene as the insulating material. It is inserted from above, resists dirt accumulation, offers reliable performance, and has a long service life.

8. The front and rear cigarette boxes are hinged together, allowing for easy opening and convenient, quick maintenance.

9. Oxygen Content Regulation (Optional): This system effectively monitors the oxygen content in flue gas and transmits the data in real-time to the control system. Through intelligent analysis by the computer, it automatically adjusts the proportion of the combustion equipment, keeping it in an optimal working state. This significantly enhances combustion efficiency, thereby substantially reducing fuel consumption.

System Protection:

Boilers come with multiple safety features: leakage protection, which automatically cuts off power in case of a leak; overheat protection, which stops the burner and sounds an alarm when the boiler water temperature exceeds the alarm temperature; secondary overheat protection, which cuts off the secondary circuit and stops the boiler when the outer shell temperature exceeds 105℃; dry burning protection, which uses a precise water level electrode rod to monitor the water level in real-time, stopping the boiler from operating when the water level reaches or falls below the extremely low level to prevent dry burning hazards.

Application Fields:

Ironing, dry cleaning, drying, washing, spin-dry, flatirons, and other equipment for配套 use.

2: Provide drinking water, steamed food, rice noodle production, soy milk boiling, tofu machine, rice steamer, sterilization tank, labeling machine, filling machine

Coating equipment, sealing machines, tableware cleaning systems, and other accessories for coordinated use.

3: Room heating, centralized heating, underfloor heating, community centralized heating, auxiliary air conditioning (heat pump) heating,配合solar energy for hot water supply.

Hot water supply for hotels, dormitories, schools, and mix stations; concrete curing for bridges and railways; sauna and bath services at leisure beauty clubs; wood flooring processing, etc.

4: Vehicle washing (cars, trains, etc.), shoe sole rubber molding, painting industry, etc.