China Difference Between Rising Film Evaporator And Falling Film Evaporator Manufacturers & Supplier

Premium Systems PortfolioFeatured Evaporation & Process Technology

Engineered solutions designed for high-efficiency concentration, drying, and solids recovery.

Jiangsu Zongheng Single Screw Press for Dewatering of Corn Fibre & Germ

Specifically engineered for dewatering solid-containing industrial slurries, achieving optimal moisture reduction in agricultural by-products.

Mechanical Vapor Recompression (MVR) Evaporation Plant

Cutting-edge MVR systems designed to recycle waste steam, minimizing energy consumption and operational expenditures.

Waste Heat Evaporator for Corn Steep Liquor Recovery

Integrates secondary steam or dryer vapor to concentrate heat-sensitive steep liquor while optimizing thermal budgets.

CE Certified Falling Film Evaporator for Heat-Sensitive Liquids

Optimized for processing temperature-sensitive media with short residence times and precise film distribution controls.

Zongheng ZXG Tube Bundle Dryer with Indirect Steam Heating

Engineered for safe, low-oxygen drying of bulk granular solids using highly efficient indirect thermal transfer surfaces.

CE Certified Single Screw Press for Solid-Containing Slurries

Heavy-duty, low-speed extraction press manufactured to international safety standards, maximizing liquid separation yields.

YDX Starch Washing Cyclone for Starch Refining

Designed for industrial multi-cyclone wash lines, ensuring deep classification and protein-impurity separation.

China Zongheng Waste Heat Evaporator Systems

Industrial thermal integration units built to recover residual heat from exhaust streams, substantially reducing utility inputs.

Industrial Comparison: Rising Film vs. Falling Film Evaporation Dynamics

In modern process industries, selecting the proper film-flow thermal separation system directly determines product quality, operating costs, and system longevity. Both rising film evaporators (RFE) and falling film evaporators (FFE) are designed to concentrate liquid solutions by distributing them along the inner walls of heated vertical tubes. However, their hydrodynamic behaviors, fluid feeding directions, and thermodynamic boundary conditions differ fundamentally.

1. Fundamental Fluid Dynamics & Operating Principles

The primary difference lies in the direction of the liquid film path relative to gravity and the driving forces that maintain film integrity:

Rising Film Evaporator (Climbing Film): The feed liquid enters from the bottom of the tube bundle. As steam heats the outer surface of the tubes, the liquid at the bottom begins to boil, generating vapor bubbles. These bubbles coalesce into a central vapor core that travels upward at high velocity. Due to viscous drag and shear forces, this fast-moving vapor pushes the liquid phase upward, forming a thin, climbing film along the inner tube walls.
Falling Film Evaporator: The feed liquid is introduced at the top of the vertical tube bundle and is distributed evenly across the tubes using specialized distribution plates. Driven by gravity, the liquid runs down the inner tube surfaces as a continuous, thin film. Boiling occurs within this falling film, causing vapor to escape into the core of the tube. The co-current flow of both vapor and liquid accelerates the downward film speed.

"The key design challenge for falling film systems is ensuring uniform initial wetting at the top tube sheet. If distribution fails, localized dry spots occur, leading to immediate scaling and thermal degradation. Rising film systems, although simpler in feed distribution, require a high temperature differential to generate the shear force needed to lift the film."

Chief Engineering Officer, Jiangsu Zongheng Co., Ltd

2. Liquid Distribution & Wetting Rates

In a falling film evaporator, the film thickness is heavily dependent on the liquid distribution assembly at the top. If the wetting rate falls below critical thresholds, the liquid film breaks, leading to dry-tube operation. Rising film systems do not require complex distribution headers since the liquid naturally pools at the bottom of the tubes before boiling lifts it. However, they demand a minimum heat flux to start the climbing action, making them less suitable for low-temperature applications.

Design Parameters	Rising Film Evaporators (RFE)	Falling Film Evaporators (FFE)
Feed Direction	Bottom inlet, flows upward against gravity	Top inlet, flows downward with gravity
Driving Force	Vapor shear force & buoyancy (thermosiphon)	Gravity & co-current vapor shear
Wetting Requirement	Self-adjusting via bottom reservoir pooling	Critical; requires liquid distribution plates
Residence Time	Moderate to long (higher liquid holdup)	Very short (thin, fast-flowing film)
Viscosity Limits	Low to medium (up to 100-150 mPas)	Medium (up to 300-500 mPas)
Temperature Sensitivity	Suitable for moderately sensitive liquids	Ideal for highly heat-sensitive liquids
Thermal Driving Force (ΔT)	High (required to initiate boiling/climbing)	Low (operates efficiently at low temperature differences)
Structural Height	Moderate (typically 4–8 meters)	High (typically 8–15 meters to ensure film length)

Global ApplicationsIndustrial Landscapes & Sourcing Intent

How varying market conditions, energy profiles, and regional regulations shape the selection of industrial evaporators.

Starch & Sweetener Refining

In wet corn milling, corn steep liquor (CSL) and glucose syrups require concentration. Falling film systems are preferred here due to their short residence times, which prevent product browning (caramelization) and protein degradation.

Alcohol & Ethanol Recovery

For distillery waste treatments (such as DDGS recovery), integrating multi-effect falling film or waste heat evaporators reduces steam consumption. High dry-solids concentration is achieved by recycling waste heat from dryer exhausts.

Industrial Wastewater & ZLD

With environmental regulations driving Zero Liquid Discharge (ZLD) policies, falling film units concentrate salty industrial waste streams before they enter crystallization stages. These systems are often paired with MVR technology.

Global Procurement Demands & Sourcing Decision Matrix

Procurement directors in Europe, North America, and Southeast Asia look for specific indicators of quality, safety, and operational reliability when evaluating evaporation plant manufacturers. Sourcing decisions are no longer based solely on initial capital expenditure (CAPEX); instead, they focus on total cost of ownership (TCO) and compliance.

ASMEU

Design Standard

CECert

European Conformity

30+

Years Experience

MVRInteg

Energy Recovery

Key Sourcing Requirements:

Regulatory Certifications: Compliance with ASME (American Society of Mechanical Engineers) Code stamps (e.g., "U" stamp) and CE certifications for pressure vessels is essential for installations in Western countries.
Material Quality & Metallurgy: Evaporators processing corrosive chemicals or food-grade starches require high-alloy stainless steel, such as 304, 316L, or Duplex steels (SAF 2205), along with precise weld finishes.
Energy Integration: High local utility rates force buyers to prioritize systems compatible with Mechanical Vapor Recompression (MVR) or Thermal Vapor Recompression (TVR), which can lower operational costs by up to 80%.

China Industry 4.0: Supply Chain Resilience & Manufacturing Supremacy

China's evaporation technology sector has transitioned from basic fabrication to high-precision engineering. By locating production within industrial hubs like Jiangsu, manufacturers benefit from localized, robust supply chains for raw materials and components, reducing delivery times for global projects.

Modernized Large-Scale Production

Facilities like Jiangsu Zongheng Concentrating and Drying Equipment Co., Ltd. operate production spaces exceeding 22,000 square meters. They feature advanced plasma welding, automated tube-to-tubesheet orbital welding, and large CNC machining centers. This enables high-precision fabrication of Class III low-pressure vessels, ensuring structural integrity and minimizing product scale accumulation points.

Engineering & Customization

Industrial concentration requires customized systems. Chinese suppliers leverage teams of experienced engineers to run process simulations, analyze fluid dynamics, and determine optimal tube lengths and liquid distribution designs based on the physical properties of customer feed fluids.

Product CategoriesJiangsu Zongheng Industrial Portfolio

Explore our core engineering capabilities in concentration, drying, and refining technology.

Evaporators

Dewatering & Dryers

Refining Systems

Jiangsu Zongheng Industrial Evaporation Technology

Zongheng provides energy-efficient, high-performance evaporation solutions including Falling Film Evaporators, Forced Circulation Evaporators, MVR Evaporation Plants, and Waste Heat Evaporator systems.

These systems are widely used in starch processing, corn steep liquor concentration, alcohol wastewater recovery, and chemical waste management, providing robust thermal efficiency and scaling resistance.

About Us

Jiangsu Zongheng Concentrating and 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 Taihu Lake. The company covers an area of over 54,000 square meters, with a production workshop area of over 22,000 square meters.

As a modern high-tech enterprise specializing in the manufacturing of concentration, drying, starch industry, alcohol DDGS, and Category III medium & low-pressure vessel equipment, Jiangsu Zongheng is an active member of the China Starch and Alcohol Association. Our systems are exported worldwide to industries such as food fermentation, chemical, pharmaceutical, environmental protection, and petrochemical.

30+

Years of Experience

20+

Design Engineers

54000+

Factory Area (m²)

22000+

Production Plants (m²)

MilestonesDevelopment History

A history of engineering innovation and manufacturing quality since 1992.

2026

The company covers over 54,000 square meters, with workshop space exceeding 22,000 square meters. Zongheng employs 3 senior engineers, over 20 engineers, and a total staff of 120 people.

2015

Achieved international quality system certification (Certificate No.: 45021), establishing a quality assurance system aligned with international standards.

2012

Acquired the ASME "U" Stamp authorization, marking the company's entry into high-end international markets.

2009

Obtained the Special Equipment Manufacturing License of the People's Republic of China (License No.: TS2232C42) for pressurized industrial systems.

1992

Jiangsu Zongheng Concentrating and Drying Equipment Co., Ltd (formerly known as Yixing Yangxi Light Industrial Machinery Factory) was established with 45 employees.

Future Trends in Evaporation & Drying Process Engineering

The global process industry is shifting toward designs that offer low energy consumption, minimized greenhouse gas emissions, and automated, maintenance-free operations. Several key technological trends are currently driving the future of rising and falling film systems:

MVR Evaporation Growth

Mechanical Vapor Recompression is becoming standard for falling film evaporators. Recompressing vapor using dynamic centrifugal blowers drastically reduces boiler steam demands, making it highly effective for municipal wastewater concentration and chemical processing.

AI-Driven Wetting Control

Modern falling film evaporators use digital flow sensors to dynamically monitor distribution. If localized dry-out conditions are detected, variable-speed feed pumps automatically adjust distribution rates, preventing tube scaling.

Advanced Anti-Fouling Coatings

Specialized inner-tube coatings reduce surface tension, making it harder for salts and organic proteins to adhere to the walls. This extends operation times between cleaning cycles.

FAQTechnical Q&A: Rising vs. Falling Film Evaporation

Common engineering and procurement questions regarding film evaporators answered by our technical design team.

When should I select a Falling Film Evaporator instead of a Rising Film Evaporator?

Choose a falling film evaporator if you are processing highly heat-sensitive fluids (such as milk, biological extracts, or enzymes) that require short residence times, or when you need to operate at low temperature differences (ΔT) to utilize waste heat. Rising film evaporators are preferred for non-heat sensitive, low-viscosity liquids where height limitations exist and simple, distribution-plate-free feeding is desired.

Can rising film evaporators handle foaming liquids?

Generally, rising film evaporators are susceptible to foaming because boiling occurs within a rising column of liquid, creating bubbles that can carry over into the vapor stream. Falling film evaporators are better suited for mild foaming applications because the liquid film flows downward, allowing vapor to separate continuously into the central tube channel without creating a bubbling pool.

How does Mechanical Vapor Recompression (MVR) integrate with falling film systems?

In an FFE-MVR system, the vapor generated from the product side is directed to a compressor. The compressor increases the pressure and temperature of the vapor, which is then recycled back to the steam chest to heat the falling film. This process reduces fresh steam usage to near-zero during continuous operation, relying primarily on electrical energy to run the compressor.

What is the typical maintenance routine for film evaporators?

Maintenance focuses on cleaning-in-place (CIP) cycles to remove mineral scale and organic deposits. Falling film evaporators require regular checks of the top distributor plates to ensure no nozzles or orifices are blocked, which could cause dry spots and localized tube scaling.