Industrial steam generation plays a critical role in supporting sectors such as food processing, chemical production, textile manufacturing, and building materials. Among the many types of industrial boilers, fire tube and water tube boilers are two of the most commonly used configurations, each offering distinct design characteristics and operational advantages.

With the increasing demand for energy efficiency and clean combustion, modern boiler manufacturers have focused on integrating the best of both systems—combining efficient heat transfer with stable operation and environmental compliance. ZOZEN Boiler, a leading industrial boiler manufacturer based in China, has long been committed to the research and development of fire tube and water tube boilers for various applications. Among its many products, the DZL series biomass steam boiler stands out as a mature and reliable solution for enterprises seeking efficient, sustainable steam supply.

ZOZEN DZL Series Biomass Steam Boiler: Design, Technology, and Advantages

The DZL series biomass steam boiler developed by ZOZEN Boiler represents a successful combination of fire tube and water tube boiler design principles. It adopts a horizontal three-pass water-fire tube structure with a single-drum longitudinal layout, optimized for burning biomass fuels such as wood chips, rice husks, corn stalks, and other agricultural residues.

The boiler body consists of two main heat absorption areas: the furnace radiation section and the convection heating section. The radiation area is formed by the drum and the water-cooled walls on both sides of the furnace, which efficiently absorb the radiant heat from the flame. Inside the drum, threaded smoke tubes form the convection heating surface, ensuring that the flue gas exchanges heat thoroughly with the water and steam mixture. This dual heating mechanism—radiant and convective—enhances thermal efficiency and ensures steady steam output even under variable load conditions.

ZOZEN 4 ton DZL biomass-fired boiler

The DZL boiler is equipped with a light-type chain grate, which ensures continuous fuel feeding and uniform combustion. The combustion system features a well-arranged air distribution structure, allowing for precise primary and secondary air supply. Secondary air is introduced above the grate to support complete combustion of volatile gases, effectively improving combustion efficiency and reducing the generation of nitrogen oxides (NOx).

The boiler adopts a quick-installation design, meaning it is delivered as a complete unit with all main components pre-assembled and tested in the factory. This reduces on-site installation time and ensures consistent quality control. For operational flexibility, the DZL series incorporates an electrical control system that allows stepless speed adjustment of the grate drive. It also provides limit parameter alarms and interlock protection to ensure safe and stable operation.

By integrating the durability of water tube structures and the efficient heat exchange features of fire tube systems, the DZL series fully embodies the advantages of fire tube and water tube boilers in a single, reliable biomass boiler design.

Biomass Boiler Application in Feed Production

A feed processing and distribution company recently sought to enhance its energy system to support a growing production scale. Steam is an essential energy source in feed drying, sterilization, and conditioning processes, directly affecting both productivity and product quality. To ensure a stable and clean heat supply, the company partnered with ZOZEN Boiler and installed a 4-ton DZL series biomass steam boiler at its facility.

The selected DZL biomass boiler features a large furnace volume and optimized combustion air distribution. The furnace walls are lined with water-cooled tubes, forming a closed and efficient heat-absorbing chamber. The secondary air system is arranged to inject air into the upper part of the furnace, ensuring complete combustion of volatile matter and improving flame stability. This design reduces smoke opacity and significantly lowers NOx emissions.

The boiler is also equipped with a speed-regulated grate drive, allowing operators to adjust the combustion rate according to fuel characteristics and load demands. By fine-tuning the grate speed, the fuel can be fully burned, reducing waste and improving fuel economy. This adaptability is particularly valuable when dealing with biomass of varying moisture content and density.

Since commissioning, the boiler has provided the feed plant with reliable steam for drying operations. The consistent steam output and stable pressure have improved drying efficiency and reduced the need for external fuel purchases. The use of renewable agricultural waste as fuel has also supported the company’s sustainability goals, achieving near-zero net carbon emissions and reducing overall energy costs.

The project highlights how ZOZEN’s DZL series, derived from the combined principles of fire tube and water tube boilers, offers both environmental and economic advantages. Through careful system design and professional technical support, ZOZEN helped the customer achieve efficient energy utilization while ensuring compliance with local environmental standards.

ZOZEN Boiler’s Commitment to Technology and Service

With decades of experience in boiler manufacturing, ZOZEN Boiler has developed a full range of fire tube and water tube boilers that cater to the diverse energy demands of industrial users worldwide. The company applies advanced production techniques—such as automated welding, precision tube rolling, and non-destructive testing—to ensure product reliability and longevity.

In addition to technical excellence, ZOZEN provides strong after-sales support. The service team assists customers from the early design stage through installation, commissioning, and long-term maintenance. Remote monitoring systems enable operators to track boiler performance in real time, helping prevent faults and maintain optimal operation. The availability of spare parts and technical consultation further guarantees smooth, uninterrupted production for clients.

For industries that require continuous and reliable steam supply, ZOZEN’s fire tube and water tube boilers deliver a practical combination of high performance, clean combustion, and operational flexibility. Whether applied in feed processing, textile finishing, chemical synthesis, or food manufacturing, these boilers consistently demonstrate their capability to provide stable, efficient, and environmentally responsible steam energy.

Conclusion

The fire tube and water tube boilers developed by ZOZEN Boiler exemplify the balance between proven engineering principles and modern innovation. By integrating the thermal advantages of both structures, ZOZEN’s DZL series biomass steam boiler offers high efficiency, reliable operation, and sustainable fuel utilization.

For enterprises looking to upgrade their energy systems, ZOZEN’s fire tube and water tube boilers represent a dependable choice—designed with technical precision, tested for reliability, and supported by a professional global service network.