Import Best Selling High Efficiency Coal Fired Boiler — Buy in Bulk from Supplier in China

The DZL series coal fired boiler from Xuzhou Double Rings Machinery Co., Ltd is a horizontal three-return water-fire tube composite boiler designed for industrial steam and hot water generation. The unit features a fixed fire tube within the drum, with light pipe water walls installed on both the left and right sides of the furnace chamber. Mechanical fuel feeding is accomplished via a light chain grate stoker, while mechanical ventilation uses a draft fan and blower combination. Ash removal operates through a scraper slag remover, and the combustion gas path routes through a first backhaul fire tube to a front smoke box, then returns through a second flue incorporating an economiser and dust collector before atmospheric release via chimney and induced draft fan. The boiler is available in steam and hot water variants, with export packing to seaworthy standards.

The DZL series typically employs a water-cooled wall construction with membrane tube panels for the furnace, improving heat transfer efficiency and reducing refractory maintenance compared to older wet-back designs. Standard design pressure for steam variants generally ranges from 1.0 to 2.5 MPa, with rated evaporation capacity from 1 to 20 tonnes per hour depending on model. Hot water variants usually operate at rated thermal power of 0.7 to 14 MW with outlet temperatures of 95°C or 115°C and return temperatures of 70°C or 90°C. The chain grate stoker accommodates bituminous coal, anthracite, and blended fuels with lower heating value above 18800 kJ/kg, though actual fuel specification and grate adjustment range must be confirmed with Xuzhou Double Rings Machinery. The three-pass flue gas arrangement maximises convective heat recovery, with typical thermal efficiency of 80-85% for this boiler class without additional economiser, or 86-89% with economiser and air preheater integration.

Primary applications include process steam for textile dyeing, food processing, chemical reaction vessels, and paper machine drying sections, as well as district heating and industrial hot water supply. The boiler's relatively compact footprint suits factory retrofit installations where space constraints exist. Buyers should confirm with Xuzhou Double Rings Machinery whether control systems include PLC-based automatic combustion control, variable speed grate drive, and oxygen trim functionality, as these features significantly affect operational labour requirements and fuel consumption. Emissions compliance is critical for international deployment, buyers should request NOx, SO2, and particulate emission test data against destination country standards, and whether the supplier offers desulphurisation or denitrification package options. Seaworthy export standard packing is stated, though specific crating, moisture protection, and container loading methodology require direct supplier confirmation.

Xuzhou Double Rings Machinery Co., Ltd is located at No.28 Beijing North Road, Xuzhou, Jiangsu 221116, in the Tongshan New District of China. The supplier holds a harbor trust tier and an imported supplier tier classification within the marketplace system. The company's registered address places it in Xuzhou, a city with established industrial boiler manufacturing clusters in Jiangsu Province, though the listing does not confirm whether production occurs at this address or at a separate facility. Response rate and average response hours both show zero, indicating that platform messaging may not be reliable and buyers should use direct contact methods.

The listing presents Xuzhou Double Rings Machinery as a manufacturer of DZL series coal fired boilers with both steam and hot water configurations. No information is provided about year of establishment, factory floor area, annual production capacity, number of employees, or reference installations. The supplier does not list specific quality certifications (such as ASME, CE/PED, or ISO 3834 welding quality) in the available data, buyers must request these directly. The company's product range appears focused on the DZL horizontal chain grate boiler platform, suggesting specialisation rather than broad boiler portfolio coverage. Buyers should verify whether Xuzhou Double Rings holds A-grade boiler manufacturing licence from the Chinese State Administration for Market Regulation, which is mandatory for boilers above certain pressure and capacity thresholds.