A chain grate boiler has long been regarded as a reliable and adaptable steam-generating solution for industries that rely on solid fuels. Its defining feature is the moving grate system, which allows fuel to be continuously fed into the furnace, promoting stable combustion and efficient heat transfer. Because of this structure, the chain grate boiler is widely used in sectors such as pharmaceuticals, textiles, chemicals, food processing, and building materials, where steam plays an essential role in heating, drying, sterilization, extraction, and various thermal processes.

Among these manufacturers, ZOZEN BOILER has become a recognized supplier of chain grate boiler solutions. Through ongoing technical development, ZOZEN provides chain grate boiler products that maintain efficient fuel utilization, balanced furnace temperatures, smooth air distribution, and consistent steam quality required by industries with demanding production cycles. By integrating design improvements with manufacturing experience, ZOZEN offers a portfolio of chain grate boiler models that support both biomass and coal-fired applications, meeting the needs of different industrial environments.

ZOZEN’s Chain Grate Boiler Solutions

The SZL series is a typical double-drum chain grate boiler, arranged in a vertical layout. The structure separates the furnace, convection tube banks, and other heating surfaces into clearly divided sections, ensuring that each part receives controlled and efficient heat transfer. Biomass fuels such as formed pellets, rice husk, wood chips and corn cobs can be used depending on availability. This broad adaptability is one of the reasons the SZL chain grate boiler is commonly selected in areas with active agricultural production or wood-processing industries.

ZOZEN 3.5 ton SZL biomass-fired chain grate boiler

The furnace of the SZL chain grate boiler is designed with sufficient volume to accommodate the combustion characteristics of biomass, which typically burns with a lighter density and higher volatility compared to traditional coal. The arch design helps guide the flame path, improving the mixing and burning of the fuel while maintaining temperature stability. The convection heating surfaces are arranged to enhance the absorption of radiant and convective heat, ensuring consistent steam production across varying loads.

Air distribution plays an essential role in biomass combustion. Therefore, ZOZEN configures independent air chambers beneath the grate, which enable operators to adjust air supply based on actual combustion conditions. This structure supports full combustion, reduces unburned carbon, and contributes to reliable boiler efficiency levels. The chain grate boiler mechanism ensures continuous fuel feeding, while matched ash and slag discharge systems support stable, long-term operation.

The DZL series is another important chain grate boiler product in ZOZEN’s portfolio. It adopts a single-drum longitudinal layout combined with a threaded flue tube arrangement in the convection section. The use of threaded tubes increases the turbulence of the flue gas, improving heat transfer efficiency and supporting consistent steam output for small- and medium-capacity production lines.

Coal fuels differ greatly from biomass in density, ash content, and heating value. For this reason, the furnace of the DZL chain grate boiler is optimized for coal combustion. The grate area is selected based on the fuel’s burnout characteristics, and the furnace height ensures adequate residence time for the burning coal. The boiler is compatible with various types of coal commonly used in many regions, giving users flexibility in sourcing fuel. Independent air chambers also appear in the DZL design, enabling precise control of primary and secondary air distribution. Uniform combustion, balanced furnace temperature, and stable steam parameters are essential to coal-based applications, making this model suitable for industries such as textiles, chemical production, and food processing where steam demand is continuous.

Case Study: Chain Grate Boiler Application in the Pharmaceutical Industry

To support higher production efficiency and manage long-term operating costs, a pharmaceutical company selected a 3.5-ton biomass steam boiler from ZOZEN’s SZL series. The pharmaceutical industry relies heavily on steam because it plays a role in drying, sterilization, extraction, concentration, and other essential production activities. Maintaining continuous and high-quality steam output is fundamental to ensuring product stability and safe production. The chain grate boiler provided by ZOZEN was chosen specifically because it meets the working characteristics of pharmaceutical manufacturing and supports flexible fuel use.

In this project, the company valued the ability of the SZL chain grate boiler to operate on multiple biomass fuels, including pellets, rice husk, wood chips, corn cobs and so on. This flexibility offers resilience in fuel sourcing, especially where the price and availability of biomass vary from season to season. The structure of the chain grate mechanism ensures continuous feeding, while the independent air chambers enable precise adjustment to maintain stable furnace temperature and complete combustion.

The company also emphasized the advantages brought by the combustion and operation systems. The grate structure and airflow management ensure thorough burning of biomass, which contributes to steady steam pressure during pharmaceutical production. The automated control system integrates functions such as fuel feeding, ash handling, and slag discharge. These features help reduce manual workload and support safer and more consistent boiler operation. For a pharmaceutical enterprise with high requirements for clean and stable steam, the chain grate boiler solution proved suitable for long-term use and aligned with the company’s production objectives.

Conclusion: Why ZOZEN’s Chain Grate Boiler Stands Out

As industries continue to depend on stable and efficient steam generation, the chain grate boiler remains a vital solution. Its ability to work with a wide range of solid fuels, combined with steady combustion and reliable steam supply, ensures that it continues to play an important role in manufacturing.

ZOZEN BOILER has strengthened these advantages through refined furnace design, air distribution systems, and heat-absorbing surfaces across both the SZL biomass series and DZL coal-fired series. Each chain grate boiler is engineered to help users achieve consistent output, durable performance, and smooth operation. Beyond the equipment itself, ZOZEN offers comprehensive service that covers technical guidance, installation support, operator training, and long-term follow-up. This combination of technical capability and full-cycle service provides users with confidence when selecting a chain grate boiler for demanding industrial applications.

For enterprises seeking a dependable chain grate boiler, ZOZEN BOILER delivers solutions that align with modern production needs and support stable, efficient, and sustainable steam supply.