What situations are prone to scaling and blockage of the machine

High salt content and high calcium and magnesium ions in the waste liquid: Salt analysis during the evaporation process shows that it adheres to the surface of the heat exchange plate/tube, resulting in a decrease in heat transfer efficiency and a lower evaporation rate as it is used.

Containing oil stains, emulsions, and suspended solids (cutting fluid, some electroplating waste liquid): Oil sludge and impurities stick to the heat exchange surface, forming oil scale, which is more difficult to clean than salt scale and easily clogs the flow channel.

Lack of front-end filtering and oil separation pretreatment, impurities directly enter the equipment, blocking nozzles, pipelines, and heat exchangers.

Long term high magnification concentration without concentration results in over saturated salt crystallization, causing blockages in pipelines and pump bodies.

What working conditions are not easily blocked

The waste liquid undergoes oil separation and filtration, resulting in less suspended solids; Regularly discharge concentrated solution; The equipment structure supports online cleaning, which significantly reduces the risk of scaling.

Difficulty level of later maintenance

Routine maintenance (mandatory)

Daily: Observe evaporation rate, vacuum, temperature, liquid level, and pump operation status;

Regularly drain the concentrated solution and avoid steaming it continuously;

Online chemical cleaning: Most equipment supports circulating flushing of heat exchangers with cleaning agents, without dismantling the machine. The frequency depends on the waste liquid, usually once a few days to several weeks;

Regularly inspect the demister and filter element, and replace them in a timely manner.

The situation where maintenance becomes troublesome

Waste liquid oil and impurities are high, and no pre-treatment is done: the cleaning frequency increases, and in severe cases, the machine needs to be disassembled and washed, which consumes labor;

Poor selection of heat exchange structure (narrow flow path), high impurities in waste liquid, easy blockage, and difficult cleaning;

There is no online cleaning function, and the machine needs to be disassembled every time scaling occurs, resulting in high maintenance costs.

Selection&Usage Suggestions

Waste liquid containing oil and impurities must undergo pre oil separation and filtration pretreatment, which is the most critical step in reducing scaling;

Prioritize models with wide flow channels and support for online cyclic cleaning;

Don't blindly pursue ultra-high concentration ratios, properly concentrate and reduce crystallization and scaling;

High salt and high oil pollution waste liquid, conduct a small-scale test in advance to evaluate the scaling rate.

Summary: Proper preprocessing+selecting the right equipment, maintenance is at the level of routine equipment in the factory, not too troublesome; Lack of preprocessing can lead to frequent machine blockages and a surge in maintenance workload.