In modern industrial operations, steam generation plays a critical role in ensuring continuous production and high product quality. Among the various boiler types, water tube and fire tube boilers stand out as essential solutions due to their efficiency, reliability, and adaptability across industries. Water tube boilers circulate water inside the tubes with hot gases passing around them, allowing for high-pressure and high-capacity steam generation suitable for energy-intensive applications. Fire tube boilers, on the other hand, pass hot flue gases through tubes surrounded by water, providing simpler construction, lower initial investment, and suitability for moderate-pressure steam requirements.

Industries such as pharmaceuticals, food processing, textiles, paper production, chemicals, and building materials extensively utilize water tube and fire tube boilers to supply consistent steam for processes like drying, sterilization, pulp heating, and chemical reactions. The selection between water tube and fire tube configurations depends on the required steam capacity, operational pressure, fuel type, and space availability. For enterprises seeking reliable boiler solutions, ZOZEN Boiler has emerged as a leading manufacturer that combines modern technology, flexible design, and practical operational experience to meet these diverse industrial demands.

ZOZEN 4 ton DZL water tube and fire tube boilers

DZL Single-Drum Biomass Steam Boiler

Among ZOZEN’s offerings, the DZL single-drum biomass steam boiler is a prominent example of an advanced water tube and fire tube boiler system. This boiler employs a single-drum water tube and fire tube design with a chain grate feeding system, enabling efficient biomass combustion and stable steam output. The DZL boiler accommodates a variety of biomass fuels, including wood chips, rice husks, agricultural residues, and palm shells, providing flexible fuel options that align with sustainable energy strategies.

The DZL series integrates both water tube and fire tube principles: The boiler body is a single drum arranged longitudinally. The threaded fireworks tubes are arranged inside the drum to form the convection heating surface, and the drum and the water-cooled walls on both sides form the furnace radiation heating surface.The three-pass flue gas path ensures maximum heat utilization before exiting through the economizer. The boiler’s compact horizontal structure and chain grate feeding mechanism allow uniform fuel combustion, while staged air supply ensures sufficient oxygen distribution, reducing unburned carbon and ash accumulation.

Typical steam capacities for DZL boilers range from 2 to 10 tons per hour, with working pressures between 1.0 and 2.5 MPa. The system’s thermal efficiency can reach over 83%, aided by dense water wall tube arrangements and optimized heat transfer design. The anti-fouling structure reduces maintenance frequency, extending operational periods and minimizing downtime. Automation features provide real-time monitoring of steam pressure, temperature, and fuel feeding, enhancing operational reliability and safety. Industries such as paper mills, food processing, and pharmaceuticals benefit from the DZL single-drum boiler’s ability to convert low-cost biomass into high-quality, stable steam.

Case Study: Pharmaceutical Enterprise

Steam supply is a critical component of pharmaceutical manufacturing, supporting processes such as sterilization, drying, and chemical reactions. A modern pharmaceutical company integrating research, production, and sales faced the need to upgrade its boiler room to ensure reliable steam generation while addressing operational efficiency and maintenance concerns.

During the planning phase, the company learned that ZOZEN Boiler had pioneered the use of arched tube plates and threaded smoke tubes, which significantly improved heat transfer and effectively eliminated rear tube plate cracking issues. Based on this reputation and demonstrated manufacturing capability, the enterprise selected a DZL 4-ton biomass steam boiler (DZL4-1.25-T) for their facility.

This boiler is a horizontal, three-pass water tube and fire tube boiler with a chain grate design, compact structure, and simplified footprint. The DZL4-1.25-T is capable of fully adapting to locally available biomass fuels, ensuring complete combustion even with higher moisture content or lower calorific value materials. Its thermal efficiency exceeds 86%, providing stable steam at a working pressure of 1.25 MPa. After the boiler room renovation and commissioning, the pharmaceutical company expects significant improvements in operational stability and steam quality, supporting their R\&D, production, and quality control processes for years to come.

The implementation of the DZL4-1.25-T has allowed the company to integrate a sustainable, biomass-based heating solution while reducing operational costs and emissions. ZOZEN’s technical team provided on-site guidance during installation and commissioning, ensuring optimal boiler performance and smooth transition to new operational standards. This example highlights how water tube and fire tube boilers from ZOZEN can be customized for complex industrial applications while addressing efficiency, sustainability, and maintenance concerns.

Technical Advantages and After-Sales Support

ZOZEN’s DZL single-drum biomass steam boiler exemplifies the benefits of combining water tube and fire tube boilers principles: high thermal efficiency, stable steam output, flexible fuel adaptability, and reduced maintenance frequency. Dense water wall arrangements and threaded smoke tubes enhance heat absorption and reduce energy loss. Staged combustion and independent air chambers optimize oxygen supply for complete biomass fuel combustion, minimizing ash production and extending equipment lifespan.

Beyond technical design, ZOZEN emphasizes comprehensive after-sales service, including installation guidance, commissioning support, operator training, and long-term maintenance programs. This ensures that clients achieve consistent steam quality, safe operation, and reliable energy supply over the boiler’s lifespan. Whether for pharmaceuticals, food processing, paper production, or other industries requiring precise steam generation, ZOZEN water tube and fire tube boilers offer both technical reliability and operational assurance.

Conclusion

The combination of water tube and fire tube technology in DZL single-drum biomass boilers provides industrial enterprises with a versatile, efficient, and sustainable solution for steam generation. With capacities ranging from small to medium-scale, these boilers meet the requirements of diverse industries, including pharmaceuticals, food processing, and paper manufacturing.

ZOZEN Boiler’s  integrate advanced design, precise engineering, and practical operational experience, ensuring stable steam supply, high thermal efficiency, and flexible fuel use. Through tailored solutions, technical expertise, and robust after-sales support, ZOZEN enables industrial clients to optimize production efficiency, reduce operational costs, and meet environmental requirements.

For enterprises seeking a reliable water tube and fire tube boilers, ZOZEN provides a proven solution that combines technology, sustainability, and operational assurance.