Single-effect Falling Film Evaporator

I. Application and Scope

The single-effect falling film evaporator is designed for low-temperature evaporation of liquids in industries such as food and chemicals, featuring continuous feeding and discharging capabilities. The short heating time and low evaporation temperature ensure that the liquid reaches the required concentration in a single pass through the equipment. It has minimal impact on the product's color, flavor, and nutritional components, making it particularly suitable for the evaporation of heat-sensitive materials like milk.

Section II: Main Technical Parameters

Water Evaporation Rate: 300Kg/h - 2000Kg/h

Material Processing Volume: 500L/h - 6000L/h

Feedstock Concentration: Based on Material Properties (provided by the customer)

Material Output Concentration: Based on Material Properties (Provided by Customer)

Evaporation Temperature: ≤65-70℃

Material Input Temperature: Based on Material Properties (provided by the customer)

Inflow Temperature: 25℃

Cooling Water Consumption: 30-50 T/h

Steam Pressure: ≥0.8 Mpa

Steam Consumption ≈ Evaporation Volume

Motor Power: As per design specifications

Section 3: Main Structure, Features, and Working Principle

1. Main Structure

The components of the single-effect falling film evaporator equipment that come into contact with material, secondary steam, and condensate water are all made of stainless steel. The constituent parts include:

Membrane-type heating chamber, condenser, separator, thermal pump, discharge pump, steam condensate pump, vacuum pump, steam regulating valve, measuring instruments, frame, electrical control cabinet, and process piping (see equipment exterior diagram).

2. Features

2.1 The membrane heating chamber is constructed with stainless steel, featuring easily removable flanges at the bottom of the membrane chamber for easy inspection of the membrane tubes. A sight glass is also installed at the lower end of the membrane chamber to observe the condensate water of the steam.

The overhead of the membrane chamber utilizes spray feeding and a forced film-coating device, ensuring uniform film formation on the inner wall of the membrane tube, thus preventing the occurrence of "coking tube" phenomena.

March 2.3: The lower tube sheet of the membrane chamber is equipped with a cleaning nozzle at the top of the separator chamber, ensuring thorough cleaning.

2.4 Adjust the steam volume through the plunger valve to ensure the concentration of the exported milk.

2.5 The racks are manufactured using stainless steel square tubes.

2.6 The condenser chamber uses a tubular condenser, allowing the cooling water to be recycled.

3. Working Principle

The milk concentrate is evenly distributed along the inner wall of the falling film tube from the top of the descending chamber through a membrane device. The milk, under the influence of its own gravity and the secondary steam flow, forms a film-like structure and flows downward. Simultaneously, it undergoes heat exchange with the heating steam on the outer wall of the descending tube, causing evaporation. The evaporated milk and secondary steam are then directed to the separator chamber for gas-liquid separation. The milk is pumped out after separation. If the milk concentration does not meet the requirements, the steam volume is adjusted through a plunger valve to ensure the desired concentration at the outlet. Increase the steam regulating valve's inlet steam volume until the milk concentration reaches the required level. If the milk concentration exceeds the requirement, reduce the steam regulating valve's inlet steam volume until the milk concentration is at the desired level. The secondary steam enters a plate-type condenser, where it is cooled with cooling water. Inert gases are extracted by a vacuum pump, ensuring the system operates under vacuum.