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Explore our industry-leading equipment designed specifically for the rigorous demands of black liquor concentration.
In the modern kraft pulping process, the efficient management and recovery of black liquor is not merely an environmental obligation; it is the absolute economic backbone of the entire mill operation. Industrial Evaporators For Pulp And Paper Mill Black Liquor Concentration serve as the pivotal technology bridging the gap between waste generation and energy recovery. When wood chips are digested into pulp, the resulting byproduct—weak black liquor—contains a complex mixture of lignin, hemicellulose, and inorganic pulping chemicals, typically at a low dry solids concentration of 13% to 17%.
To recover the valuable inorganic chemicals (sodium hydroxide and sodium sulfide) and harness the immense caloric value of the dissolved organic matter, this weak liquor must be concentrated to high solids levels (often exceeding 75% to 85% dry solids) before it can be effectively combusted in the recovery boiler. The evaporation plant is inherently the largest consumer of steam in a pulp mill. Therefore, optimizing the thermodynamic efficiency of the evaporator train directly translates to massive reductions in operational expenditures (OPEX) and a significant decrease in the mill's carbon footprint.
Advanced falling film evaporators, integrated with Mechanical Vapor Recompression (MVR) or Thermal Vapor Recompression (TVR) technologies, have revolutionized this process. By utilizing high-efficiency heat transfer surfaces and intelligent vapor routing, modern systems minimize scaling, extend operational uptime, and drastically reduce the specific steam consumption per ton of evaporated water. As global environmental regulations tighten, the demand for high-solids concentration systems that ensure zero liquid discharge (ZLD) and maximum energy cogeneration has reached unprecedented levels.
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.
Achieving ultra-high solids (above 80%) in black liquor is notoriously difficult due to the exponential increase in viscosity and the severe risk of inorganic salt precipitation (such as sodium sulfate and sodium carbonate). Modern Industrial Evaporators address this by utilizing specialized concentrator designs, such as forced circulation or specialized falling film concentrators, combined with precise temperature control. This ensures that the liquor remains fluid enough to pump while preventing the catastrophic fouling of heat exchange tubes, thereby ensuring continuous, uninterrupted boiler operation.
The integration of Artificial Intelligence (AI) and the Internet of Things (IoT) into evaporation plants is a major development trend. By embedding smart sensors across the evaporator train, operators can monitor heat transfer coefficients in real-time. AI algorithms analyze this data to predict fouling rates accurately, allowing mills to schedule automated "boil-outs" or wash cycles precisely when needed, rather than on a fixed, inefficient schedule. This tech-driven approach minimizes downtime and maximizes the lifespan of the equipment.
Mechanical Vapor Recompression (MVR) is transforming pre-evaporation stages. By using electrical energy to compress secondary vapor, MVR systems elevate the vapor's temperature and pressure, allowing it to be reused as the heating medium in the same effect. This dramatically cuts live steam consumption. Similarly, Thermal Vapor Recompression (TVR) utilizes high-pressure motive steam to entrain low-pressure vapor, improving thermal efficiency. When applied to Pulp And Paper Mill Black Liquor Concentration, these technologies offer an unparalleled Return on Investment (ROI) by freeing up boiler steam for electricity generation.
Black liquor is highly corrosive and prone to scaling. The selection of advanced metallurgy, such as Duplex stainless steels (e.g., SAF 2205) or high-nickel alloys, is critical for the longevity of the evaporators. Furthermore, advanced liquor distribution systems ensure an even wetting of the tubes, preventing dry spots where localized scaling and corrosion typically initiate. Our engineering focuses heavily on fluid dynamics to ensure optimal flow regimes.
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.
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.
The global market for industrial evaporators in the pulp and paper sector is undergoing a rapid transformation. Driven by stringent environmental regulations and the urgent need for energy independence, mills are upgrading legacy systems to state-of-the-art multi-effect and MVR configurations. The economic reality is clear: mills that efficiently concentrate black liquor generate excess power, turning a waste processing step into a profitable energy export center. The trend is moving heavily towards higher dry solids firing, which increases boiler capacity, reduces sulfur emissions, and improves the overall thermal efficiency of the Kraft cycle.
Furthermore, the push for Zero Liquid Discharge (ZLD) in industrial processing has positioned advanced evaporation technology at the forefront of environmental compliance. By effectively separating clean condensate from highly concentrated effluents, mills can recycle water back into the pulping process, drastically reducing fresh water intake and wastewater discharge. This closed-loop approach is becoming the gold standard worldwide.
Global Reach & Service:
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!
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.
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