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Premium China manufacturer and supplier of multi-effect evaporators for chemical recovery and liquid concentration plants worldwide.
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Engineered for efficient indirect steam heating with reliable, robust wear plates, durable seals, and optimized rotation mechanisms.
Read More →A tube bundle dryer is a highly specialized type of indirect contact dryer designed to manage bulk materials with high moisture levels. It features a stationary shell containing a rotating bundle of heating tubes. Steam enters the central shaft and is distributed directly to these tubes. The material to be dried is fed into the stationary outer casing. As the tube bundle rotates, internal shovels scoop the material up, lifting it and allowing it to slide down over the heated exterior surfaces of the tube bundle.
Thermodynamically, this setup maximizes the contact surface area between the product and the steam-filled heating elements. Unlike direct drying systems, the heat carrier (medium steam) does not come into contact with the raw material, eliminating risks of contamination and significantly reducing the volume of exhaust air. Consequently, this leads to efficient vapor filtration and lower thermal losses.
The rotating tube bundle has a variable speed profile that ensures a consistent material residence time. Special shovel angles can be adjusted to control the flow velocity of the product. Operating parameters like steam pressure, raw material moisture, and casing negative pressure are controlled automatically to prevent localized overheating of temperature-sensitive materials like starch, gluten, and feed proteins.
The core operation of a CE-certified ZXG Tube Bundle Dryer from Jiangsu Zongheng involves three primary steps: heat conduction, mass transfer (evaporation), and gas-vapor removal:
In modern industrial processes, the demand for energy-efficient drying systems has shifted attention to indirect heating systems. Worldwide, the tube bundle dryer is a preferred piece of equipment in wet corn milling, potato starch production, bio-ethanol extraction (DDGS), brewing processes, and waste treatment plants. Globally, chemical processing plants value these machines for drying mineral dusts, synthetic resins, and agricultural chemicals where volatile vapors must be safely recovered.
With strict carbon neutral targets, international enterprises are focusing on system thermal optimization. Modern tube bundle dryers operate with energy consumption rates of approximately 1.2 to 1.3 kg of steam per kg of water evaporated. This makes them significantly more efficient than direct-fired rotary dryers or high-flow pneumatic airflow systems. Meeting CE criteria ensures these machines comply with strict European directives on machinery safety (2006/42/EC), pressure equipment safety (2014/68/EU), and ATEX guidelines for potentially explosive dust environments.
Years of Engineering Experience
Expert Process Engineers
Total Factory Area (m²)
Advanced Production Workshop (m²)
Jiangsu Zongheng holds the ASME "U" stamp authorization alongside CE certifications. This ensures all pressure components, welding procedures, and material test certificates conform to rigorous international safety standards.
Located in Yixing City, on the shores of Taihu Lake, our facility leverages a supply chain of high-grade raw materials, advanced laser cutting, automatic tube-sheet welding stations, and non-destructive testing labs.
Our long-standing vendor relationships and integrated manufacturing facilities allow us to offer high thermal efficiencies, premium durability, and robust designs at competitive price points.
Our engineering team does not supply off-the-shelf equipment. We evaluate every material's physical properties, such as bulk density, adhesion tendencies, specific heat capacity, and initial moisture profiles. For sticky materials like corn steep liquor mixtures, we integrate wear-resistant alloy coatings and specialized scraper blades. This prevents material scaling on the tubes, ensuring consistent heat transfer and continuous factory throughput.
In bio-refining plants producing Distillers Dried Grains with Solubles (DDGS), our tube bundle dryers operate seamlessly as the primary drying stage. In starch washing lines, the dryer consistently reduces moisture levels down to the precise levels required for packaging. This level of process reliability has established Jiangsu Zongheng as a trusted global manufacturer.
Our state-of-the-art facility spans over 54,000 square meters, featuring a 22,000 square meter production workshop. We employ 3 senior engineers, 20+ specialized design engineers, and a total staff of 120 people.
Acquired formal international quality system certification (Certificate No.: 45021). This step established our comprehensive quality assurance framework, matching international operational standards.
Acquired the ASME "U" Stamp authorization, validating our capability to design and fabricate high-quality, code-compliant pressure vessels for the international chemical and petrochemical sectors.
Obtained the Special Equipment Manufacturing License of the People's Republic of China (License No.: TS2232C42). This license cleared the path for large-scale boiler and vessel manufacturing.
Officially recognized as a Jiangsu Provincial High-Tech Enterprise, underscoring our focus on thermal efficiency research and chemical equipment innovation.
Our company took the lead in the regional industry by obtaining the ISO9001 Quality Management System certification, formalizing our standard operating procedures.
Originally founded as Yixing Yangxi Light Industry Machinery Factory, our operations began on a 15-mu footprint with 45 dedicated employees, targeting domestic agricultural process machinery.
The industrial drying landscape is undergoing transition, driven by stricter energy guidelines and high-performance requirements. We are seeing several key trends:
Normally, the operating steam pressure inside the tubes ranges between 0.3 MPa and 0.6 MPa, depending on the heat sensitivity of the material. For materials that degrade at higher temperatures, pressure is kept low to manage the surface temperature of the tubes.
A tube bundle dryer uses indirect steam conduction, meaning the heating medium does not touch the product. In contrast, a rotary drum dryer typically relies on direct combustion gases. This indirect method results in higher energy efficiency, minimal clean air volume requirements, lower dust emissions, and safer operation with sensitive powders.
We build our equipment in compliance with global standards, including the ASME Boiler and Pressure Vessel Code (with U stamp capabilities) and European Union CE certifications (specifically Pressure Equipment Directive 2014/68/EU and Machinery Directive 2006/42/EC), ensuring safe operation under local regulations.
The rotary joint must be inspected periodically to check the state of the internal graphite seals. The stuffing box packing requires routine lubrication and adjustment to prevent vapor leaks. We design our dryers with accessible service platforms to simplify these routine checks.
Yes. However, sticky materials require a tailored configuration. We fit scrapers on the tube bundle supports and utilize specialized internal paddle arrangements to continuously clean the heat transfer surfaces and prevent build-up.
Contact the engineering department at Jiangsu Zongheng for a custom thermal design and budget estimate today.
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