Steam Drum Boiler

A steam drum boiler is a type of water-tube boiler that incorporates one or more large drums used to separate steam from water and to stabilize circulation. In a steam drum boiler, water circulates through banks of tubes heated by combustion; the generated steam rises into the drum where steam-water separation occurs and saturated steam is drawn off for process or heating use. The steam drum also acts as a reservoir for water treatment and blowdown operations, and it provides a convenient location for instrumentation such as level gauges and safety valves. The steam drum boiler design is widely applied in industry because it offers reliable steam quality, good thermal capacity, and relatively simple water-level control—qualities that make it suitable for power generation, chemical plants, food processing, and industrial heating systems.

ZOZEN’s steam drum boiler product range

ZOZEN Boiler manufactures a full range of steam drum boiler models tailored to different fuels, capacities and industrial requirements. The company applies the steam drum boiler concept across single-, double- and three-drum configurations to match operational needs and fuel choices. Below is an overview of ZOZEN models organized by drum configuration.

1.Single-Drum

• DZL Biomass Boiler

ZOZEN’s single-drum steam drum boiler units are designed for compactness and cost-effective operation in small- to medium-scale installations.
This boiler uses a single steam drum with a natural-circulation water-tube layout and a robust grate designed for varied biomass fuels such as wood chips, rice husks, and pellets. The single-drum DZL steam drum boiler offers straightforward operation, automatic feeding systems, and effective ash handling, making it an attractive option for facilities seeking renewable-fuel steam solutions without complex boiler geometry. Thermal efficiency ＞83%.

Recently, ZOZEN Boiler successfully exported two sets of steam boiler equipment to Spain. This project provided two efficient and environmentally friendly steam boilers for a local agricultural and sideline product processing plant in Spain, meeting their production needs while achieving efficient energy utilization and sustainable environmental development. As the customer’s production scale continues to expand, the demand for energy is also increasing.The customer requires a steam boiler solution that can meet production capacity requirements and comply with the strict European environmental protection standards.

Main Equipment Introduction:
4 tph Biomass Steam Boiler:
Fuel Selection: Oat shells are chosen as fuel due to their renewability and low pollution characteristics, in line with Europe’s promotion policy for renewable energy.
Technical Features: The boiler is designed with high thermal efficiency, and its emissions meet European environmental standards, ensuring a clean and efficient production process.
1.5 tph Diesel Steam Boiler:
Backup Function: As a backup boiler, it ensures that production is not affected during the maintenance of the main boiler or in case of failure.
System Customized Solutions:
Lock Hopper: The customized lock hopper can achieve uniform feeding, effectively preventing hopper backfire, ensuring the stable operation of the boiler.
Fans and Pumps: These auxiliary equipment work in conjunction with the main boiler, improving the efficiency and reliability of the entire system.
Speed Control Box and Frequency Conversion Technology: The application of the speed control box and frequency conversion technology allows the boiler to adjust its operating state according to actual needs, achieving energy saving and consumption reduction.

2.Double-Drum

• SZS Oil /Gas Boiler

The SZS series is a water-tube steam drum boiler featuring two drums to create an efficient and balanced circulation circuit. As a double-drum steam drum boiler, the SZS offers fast response to load changes, higher thermal efficiency (＞98%), and suitability for continuous industrial processes. It is often selected when clean-burning fuels (natural gas or light oil) are preferred for lower emissions and tight process control.

Steam plays a vital role in several key processes during tire manufacturing. From the initial stage of rubber compounding, steam is utilized to preheat the Banbury mixer, ensuring that the rubber compound is uniformly mixed at the optimal temperature. Later, in the calendering and extrusion processes, steam continues to heat the equipment, assisting the rubber compound in taking the desired shapes. During the tire building process, the steam-heated building machine brings together various semi-finished components to form the preliminary structure of the tire.

Sentury Tire has established an intelligent manufacturing facility in Morocco with an annual production capacity of 12 million high-performance passenger car tires. To meet the production demands of this facility, Sentury Tire’s Moroccan plant selected ZOZEN’s SZS series gas-fired steam boilers.

In addition, ZOZEN Boiler’s service consciousness and professional expertise have also garnered high praise from Sentury Tire’s Moroccan plant. Facing stringent deadlines, ZOZEN Boiler promptly responded by sending seasoned technical personnel to the site to offer comprehensive technical support and guidance. This swift service response not only ensured the successful progression of the project but also helped ZOZEN Boiler earn a positive reputation in the global market.

• SZL Coal Boiler

For large-scale coal-fired steam generation, the SZL double-drum steam drum boiler provides substantial capacity, robust construction and efficient ash removal. The double-drum configuration enhances circulation and steam-water separation, making this steam drum boiler type appropriate for heavy industrial operations with continuous steam demand. Thermal efficiency ＞81%.

Established in 1997, Baheer Group is a large-scale enterprise specialized in the production, packaging and printing of corrugated paper. With the increasingly larger production scale, the company’s original heating equipment could not meet the steam demands of corrugated paper production and printing lines. In order to ensure the product quality and further improve the production efficiency, Baheer Group decided to introduce a set of high-efficiency and eco-friendly coal-fired steam boiler. After investigating and comparing the qualifications of many industrial boiler manufacturers in the world, Baheer Group finally purchased a set of SZL series coal-fired steam boiler from ZOZEN Boiler and set high requirements for the boiler’s environmental protection performance.

According to the coal characteristics, ZOZEN technical team optimized and reasonably arranged the furnace arch, furnace and furnace heating surface, adjusted the ratio of primary to secondary air and optimized the secondary air layout to make the fuel combustion more sufficiently. It is worth mentioning that ZOZEN also customized a set of more cost-effective boiler exhaust gas treatment system for Baheer Group. It adopted cyclone + wet scrubber methods. After filtration, dust removal and dust cleaning, the dust removal efficiency could reach over 98% and the desulfurization efficiency could reach over 85%, which lowered the dust emission concentration to 250mg/Nm3 and made the Ringelman emittance lower than 1 degree. This project had successfully passed the environmental protection inspection organized by Afghan government, which proved to meet the local environmental protection standards.

3.Three-Drum

• DZL Biomass Boiler

The DZL series third-generation biomass boiler is a water tube boiler composed of three drums. It is independently developed by ZOZEN Boiler and has independent intellectual property rights. The boiler adopts an assembly structure, consisting of two large components, the upper and lower parts. Thermal efficiency ＞88%.

Turkey Hendese Group was established in Ankara, Turkey, in 2018. As a local professional turnkey machinery contracting project company in Turkey, Hendese’s business covers consulting services, manufacturing of steel structure, contracting services, renewable energy systems, hydraulic machinery systems, etc. Hendese ordered a set of biomass-fired boiler from ZOZEN Boiler for a local biomass boiler power generation project.

ZOZEN Boiler provides the new-type DZL series tri-drum biomass-fired boiler for HENDESE Group.

The boiler adopts an assembled structure and is divided into an upper part and a lower part, and is a water pipe Boiler composed of three drums. The boiler capacity covers 10-40 t/h, and the working pressure is 1.25-2.5 MPa. As a third-generation biomass boiler, it is designed to further solve the ash accumulation problem in the convention area of the second generation of ZOZEN biomass-fired boilers with double drums. The flue gas enters the convention area from furnace outlet, and the dust in the flue gas directly falls into the ash hopper at the bottom of convention area.

At the same time, according to different biomass fuel characteristics, the boiler can be equipped with different grates to ensure the sufficient combustion of biomass fuels. It also prolongs the service life of the grate, which meets the strict requirements of the biomass power generation system on the efficiency and stability of the boiler.

ZOZEN’s strengths and service system

ZOZEN Boiler’s ability to supply reliable steam drum boiler solutions is supported by substantial manufacturing capability, technical expertise and a comprehensive service system.

Manufacturing and quality control: ZOZEN operates modern fabrication facilities with strict QA/QC and testing procedures. Each steam drum boiler is subject to hydrostatic testing and rigorous inspection to meet design standards and regulatory requirements.

R&D and engineering support: The company invests in research to improve heat transfer, reduce emissions and enhance combustion control. ZOZEN’s engineering team provides customized designs, sizing and integration support so that the selected steam drum boiler meets specific process needs.

Certifications and compliance: ZOZEN holds multiple national and international certifications that demonstrate compliance with safety, environmental and quality management standards—important for customers deploying a steam drum boiler in regulated industries.

Turnkey project capabilities: ZOZEN offers end-to-end services including site survey, detailed engineering, manufacturing, delivery, installation, commissioning and operator training to ensure smooth steam drum boiler start-up and reliable operation.

After-sales and lifecycle services: A global service network provides preventive maintenance, spare parts supply, remote diagnostics, and field service engineers to maximize uptime and extend service life of each steam drum boiler.

Conclusion

The steam drum boiler remains a cornerstone technology for industrial steam generation, valued for its reliable steam separation, controllable circulation and adaptability to a variety of fuels and capacities. ZOZEN’s comprehensive steam drum boiler portfolio—from single-drum DZL biomass to double-drum SZS and SZL series and three-drum DZL variants—demonstrates the company’s capability to match drum configurations to customer needs. Coupled with strong manufacturing, engineering, certifications and a robust service system, ZOZEN provides complete steam drum boiler solutions to meet modern industrial demands for performance, safety and environmental compliance.