High-efficiency industrial machinery engineered to meet global compliance and reliability standards
In modern industrial process engineering, the segregation and crystallization of solid solutes from liquid matrices require highly optimized thermodynamic pathways. As global environmental regulations tighten and resource extraction pressures escalate, the implementation of advanced evaporative crystallizers has shifted from a standard processing step to a critical pillar of corporate efficiency, zero liquid discharge (ZLD) directives, and high-purity product extraction.
Evaporative crystallization utilizes heat input to vaporize a volatile solvent (typically water) from a solution, forcing the non-volatile solute to exceed its solubility limit and nucleate into structured crystals. Unlike simple evaporators that seek only to concentrate a liquid, a crystallizer must manage fluid dynamics, heat transfer rates, metastable zone width (MSZW), and mechanical abrasion to produce uniform crystal size distribution (CSD) while preventing the fouling of heat exchanger surfaces.
Achieving controlled supersaturation is the core metric of performance. If a system generates supersaturation too rapidly, uncontrolled nucleation occurs, yielding fine, irregular crystals that are difficult to filter, wash, and dry. Conversely, if supersaturation is kept within the metastable zone, solute deposition occurs preferentially on existing crystal nuclei, ensuring robust, high-purity crystalline outputs that are easily separated by downstream equipment such as Single Screw Presses or centrifuges.
Global procurement teams must balance initial capital expenditure (CAPEX) with long-term operational costs (OPEX). Modern Chinese manufacturers have developed sophisticated thermodynamic configurations to meet these financial and environmental targets:
Integrating these technologies into a single plant design offers massive gains. For instance, a system can use a high-efficiency Falling Film Evaporator for initial volume reduction, followed by a Forced Circulation Crystallizer to handle the final, highly concentrated slurry. By using waste heat recovery pathways, modern manufacturers can capture and reuse low-grade thermal energy from dryers or exhaust vents, further cutting carbon emissions.
Founded in 1992 as the Yixing Yangxi Light Industry Machinery Factory, Jiangsu Zongheng Concentrating and Drying Equipment Co., Ltd. has evolved into a leading high-tech manufacturer specializing in evaporation, crystallization, and drying technology. Based in Zhoutie Town, Yixing City, on the shores of Taihu Lake, the company operates a state-of-the-art facility equipped to handle complex processing requirements.
As an active member of the China Starch and Alcohol Association, Jiangsu Zongheng maintains a highly certified manufacturing environment. Our capabilities cover the design, fabrication, and testing of Category III medium & low-pressure vessels, compliant with both domestic licensing and stringent international quality standards.
Our compliance history proves our commitment to quality, ensuring that every piece of machinery we produce meets global procurement requirements:
Established as Yixing Yangxi Light Industrial Machinery Factory, serving domestic chemical and starch processing sectors.
Acquired ISO9001 international quality management certification, standardizing production and materials tracking.
Recognized for technical innovation and patents in multi-effect evaporation and mechanical vapor recompression.
Obtained the Special Equipment Manufacturing License of the People's Republic of China (License No.: TS2232C42) for Category III pressure vessels.
Certified to design and manufacture pressure vessels in accordance with ASME Boiler and Pressure Vessel Code Section VIII Division 1.
Achieved expanded certifications (Certificate No.: 45021) to streamline supply chains for direct exports to EU and North American markets.
Evaporative crystallizers are rarely standalone installations. In industries like agricultural wet milling, bio-ethanol production, and chemical waste management, these systems are integrated with dryers, presses, and cyclones to optimize efficiency.
In starch processing and bio-ethanol distilleries, the thin stillage contains valuable proteins, fats, and soluble solids. Jiangsu Zongheng provides a complete process loop:
Thickening: Multi-effect waste heat evaporators concentrate thin stillage.
Dewatering: High-efficiency Single Screw Presses separate wet solids from the slurry.
Drying: ZXG Tube Bundle Dryers dry the solids via indirect steam heating, yielding a high-protein animal feed ingredient (DDGS).
Chemical waste streams contain high amounts of sodium chloride, sodium sulfate, and organic compounds. Standard disposal methods are no longer viable under modern environmental laws. Our forced circulation crystallizers handle these high-solutes streams, precipitating salts as solid minerals for safe disposal or industrial reuse, while recycling high-purity water back into the plant.
For heat-sensitive organic acids, amino acids, and sugars, preserving molecular structure is critical. Our falling film concentrators operate under high vacuum to lower the boiling point, preventing thermal degradation and preserving product quality.
Procuring heavy crystallization machinery from China requires careful verification of material grades, quality control protocols, and shipping logistics. At Jiangsu Zongheng, we address these concerns through a structured QA/QC framework:
Corrosive fluids like chloride-rich chemical waste require advanced metallurgy. We fabricate using high-grade materials tailored to the application:
All weldments on our pressure vessels undergo rigorous NDT testing:
The next generation of industrial concentration equipment will focus on automation and environmental sustainability. Our R&D division is focused on three main engineering goals:
1. Intelligent Control Systems: Integrating DCS (Distributed Control Systems) with real-time turbidity, refractive index, and density sensors to automatically adjust steam and feed rates. This prevents scaling, optimizes crystal size, and stabilizes operations.
2. Hybrid Heat Sources: Combining solar preheating or thermal vapor recompression (TVR) with MVR loops to achieve high efficiency even in plants with limited electricity grids.
3. Enhanced Mechanical Compaction: Upgrading our single screw presses and bundle dryers to lower moisture content in solids before thermal drying, reducing overall energy use.
A falling film evaporator relies on gravity to distribute a liquid film down the heating tubes. It is ideal for low-viscosity, non-scaling liquids and offers high heat transfer rates. A forced circulation crystallizer uses high-capacity recirculating pumps to keep the liquid pressurized, preventing boiling inside the tubes. Boiling and crystallization occur only as the fluid enters the flash vessel, making it the preferred choice for scaling and slurry applications.
MVR operates as a heat pump system. By mechanically compressing the evaporated solvent vapor, the system raises its temperature and pressure. This compressed vapor is then recycled as the heating source for the evaporator. This process eliminates the need for continuous boiler steam, saving up to 90% in thermal energy costs compared to single-effect evaporators.
Jiangsu Zongheng designs and manufactures equipment in compliance with GB150 (Chinese National Standard for Pressure Vessels), ASME Section VIII Division 1 (bearing the "U" Stamp), and CE PED (Pressure Equipment Directive) for European projects.
We prevent scaling by maintaining optimal fluid velocity (1.5–2.5 m/s) to ensure turbulent flow, keeping the temperature difference (ΔT) low, and suppressing boiling in the tubes by maintaining sufficient hydrostatic head inside the forced circulation system.
Yes. For corrosive solutions containing chlorides or heavy acids, we fabricate the wetted components from corrosion-resistant alloys, including Duplex Stainless Steel (SAF2205/2507), Titanium alloys (Gr.2), and Hastelloy.
With proper maintenance, regular cleaning cycles (CIP), and the correct metallurgy, a professional evaporative crystallizer system from Jiangsu Zongheng can operate reliably for 15 to 20+ years.
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