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In both sugar cane and sugar beet processing, the extraction of raw juice yields a dilute solution consisting of approximately 10% to 15% sucrose by weight. To transform this thin juice into crystallizable syrup, a massive volume of water must be removed. This is where the Triple-Effect Evaporator serves as the thermal heart of the sugar refinery. By cascading thermal energy through three sequential stages of boiling vessels under progressively lower pressures, industrial operators can achieve dramatic reductions in steam consumption while safely elevating the syrup concentration to 65%–70% Brix.
Industrial Status: Historically, sugar factories relied on low-efficiency single-effect boiling or simple direct-fired pans. Today, stringent carbon emission mandates and rising fuel costs have turned thermal efficiency into the primary metric of refinery profitability. The implementation of triple-effect and multi-effect configurations is now standard industry practice, often integrated with mechanical vapor recompression (MVR) or thermal vapor recompression (TVR) systems to minimize primary steam usage.
The core operating principle of a Triple-Effect Evaporator rests on the reuse of latent heat. Primary steam enters the heating chamber (calandria) of the first effect, boiling the raw juice. The vapor generated from this juice is not vented; instead, it is directed to the calandria of the second effect, serving as its heating medium. Because the second effect operates at a lower pressure (and consequently a lower boiling temperature) than the first, the vapor from the first effect can successfully transfer heat and boil the juice in the second stage. This process is repeated in the third effect, which operates under a deep vacuum to lower the boiling point further.
While the goal of concentrating juice to thick syrup is identical, the physical properties of sugar cane juice and sugar beet juice present distinct engineering challenges that influence the design of the Triple-Effect Evaporator.
Sugar cane juice contains significant amounts of suspended fibers (bagacillo), waxes, and inorganic salts (primarily silica and calcium phosphates). During evaporation, these compounds tend to deposit on the heat exchanger tubes, forming a hard scale that severely restricts heat transfer. To combat this, evaporators designed for sugar cane syrup concentration must incorporate:
Sugar beet juice is characterized by a higher concentration of nitrogenous compounds, pectins, and saponins. These components make the juice highly prone to foaming, which can carry sugar droplets into the vapor line, resulting in product loss and wastewater contamination. Evaporators built for beet syrup must feature:
Did You Know? The boiling point elevation (BPE) of sugar syrup increases drastically as the concentration rises from 15 Brix to 70 Brix. At high concentrations, the syrup boils at a temperature significantly higher than pure water at the same pressure. Engineers must precisely calculate this BPE curve to ensure the temperature differences (Delta T) across all three effects remain sufficient to drive heat transfer.
The global sugar industry is undergoing a structural shift toward decarbonization and circular economy principles. Evaporator technology is evolving to meet these new standards through several key trends:
To reduce primary steam consumption even further, modern triple-effect setups are increasingly integrated with Thermal Vapor Recompressors (TVR) or Mechanical Vapor Recompressors (MVR). A TVR uses high-pressure motive steam to entrain and compress a portion of the waste vapor from one of the effects, upgrading its thermal energy so it can be reused in the heating chamber. MVR systems, driven by electric compressors, can recycle almost all latent heat, virtually eliminating the need for steam under steady-state operations, aligning with the electrification trends in green factories.
AI-driven control loops are being deployed to monitor heat transfer coefficients in real-time. By analyzing flow rates, pressure drops, and Brix levels, the system can predict exactly when scaling is beginning to impede efficiency. This allows operators to schedule preventive CIP cycles, minimizing downtime and maintaining optimal steam economy throughout the harvesting season.
Jiangsu Zongheng Concentration & Drying Equipment Co., Ltd. (formerly Yixing Yangxi Light Industry Machinery Factory), founded in 1992, is located in Zhoutie Town, Yixing City, on the shores of the beautiful Taihu Lake. The company covers an area of over 54,000 square meters, with a production workshop area of over 22,000 square meters.
Jiangsu Zongheng is a modern high-tech enterprise specializing in the manufacturing of concentration, drying, starch industry, alcohol DDGS, and Category III medium & low-pressure vessel equipment. It is currently a member enterprise of the China Starch and Alcohol Association. Its products are widely used in industries such as food fermentation, alcohol, chemical, pharmaceutical, environmental protection, and petrochemical.
The company's other main products include Tube Bundle Dryers, with design and manufacturing capabilities reaching 1600m² (making it a primary manufacturer of large tube bundle dryers). Other main products such as Single Screw Fiber & Germ Dehydrators and Wash Cyclones are recognized as high-quality products by starch manufacturers and the industry. High-quality products and a sincere service attitude have won consistent praise and trust from numerous users at home and abroad, fully demonstrating the company's first-class technical advantages and manufacturing capabilities for large-scale equipment.
Jiangsu Zongheng is always committed to exploration and innovation. Through years of sincere effort and user support, it has achieved sustained development. Main products include evaporation plants, comprising Multi-Effect Evaporators, Thermal Vapor Recompressors (TVR), Waste Heat Evaporators, and Mechanical Vapor Recompressors (MVR, achieving minimal unit energy consumption). These are widely used for liquid concentration, including distillates, alcohol stillage, ammonium sulfate, corn steep liquor, itaconic acid, threonine, starch sugar, sorbitol, glucose, fructose, trehalose, erythritol, organic wastewater, high-salinity wastewater, etc., making the company one of the domestic manufacturers with the most extensive product variety.
In March 2002, the company took the lead in obtaining ISO9001:2015 international quality system certification (Certificate No.: 45021), establishing a complete quality assurance system aligned with international standards. In July 2007, it became a Jiangsu Provincial High-Tech Enterprise. In April 2009, the company obtained the Special Equipment Manufacturing License of the People's Republic of China (License No.: TS2232C42). In August 2012, it acquired the ASME "U" Stamp authorization, marking the company's entry into a new phase of development. The company possesses strong R&D capabilities and advanced manufacturing processes, currently employing over 3 senior engineers and more than 20 engineers and assistant engineers. Multiple innovative technologies have been patented, and many products hold leading positions domestically.
The company currently holds an absolutely leading position in evaporation technology and has extensive cooperation with many renowned large domestic group companies, including Zhuofeng Biology, Meihua Group, Yufeng Group, Yihai Kerry, North China Pharmaceutical Group, Harbin Pharmaceutical Group, Shouguang Juneng, Qilu Pharmaceutical, Qiyuan Pharmaceutical, Xiwang Group, Shengtai Biology, Zhejiang Huakang, Kelun Pharmaceutical (Yili), and Shandong Tianli.
While meeting domestic market demand, the company's DDGS alcohol equipment and tube bundle dryer series products have been exported to Russia and Southeast Asian markets. We are capable of providing professional technical support and after-sales service nationwide for our vast user base. High-quality products and their unique solutions not only enhance our corporate economic benefits but also bring us satisfaction by solving processing challenges for our clients.
We warmly welcome friends from various industries, both domestic and international, to visit us for cooperation and mutual development!
