Complete treatment of second-hand three effect evaporator

Complete treatment of second-hand three effect evaporatorIn the fields of industrial wastewater treatment and chemical production concentration, second-hand three effect evaporators have attracted much attention due to their high cost-effectiveness and mature energy-saving technology. This article will provide you with a purchasing guide from device principles, selection points, market trends to usage and maintenance.

**1、 Understanding the core value of a three effect evaporator: By connecting three evaporation tanks in series and using the secondary steam generated by the previous effect as the heat source for the subsequent effect, the steam utilization rate of the three effect evaporator can reach over 90%. Compared to single effect equipment, energy consumption is reduced by 60% -70%, making it particularly suitable for high concentration wastewater treatment in industries such as pharmaceuticals, food, and environmental protection. The price of second-hand equipment is usually 30% -50% of that of a new machine, but special attention should be paid to the material of the heat exchange tubes (such as titanium, which is corrosion-resistant), the evaporation area (ranging from 10-100 square meters), and the degree of automation.

**2、 The current situation and price analysis of the second-hand market * * According to data from the 1688 platform (January 2026), the second-hand three effect evaporator shows polarization: 1 **Low price range (30000 to 80000 yuan) * *: mostly small equipment (evaporation capacity ≤ 500kg/h), which may have problems such as scaling of heat exchange tubes and aging of instruments, suitable for users with limited budgets and maintenance capabilities. two **Medium range (150000-30000 yuan) * *: Includes second-hand equipment such as Jiangsu Saideli and Shanghai Yuanyue, usually equipped with a complete set of condensers and vacuum pumps, with an evaporation capacity of 2-3 tons/hour, and some support PLC control.

Special attention should be paid: Anhui, Shandong and other places have gathered a large number of second-hand equipment dealers, but the actual equipment sources are mostly chemical plants that have been shut down in coastal areas. It is recommended to prioritize suppliers who provide testing services.

**3、 Selection Guide for Avoiding Pits * * 1 **Material verification * *: - Use a magnet to test the stainless steel material (316L non-magnetic) - Check the wall thickness of the heat exchange tube. If the corrosion exceeds 30% of the original thickness, it needs to be replaced - Observe whether there are repair welding marks on the evaporator chamber weld seam

2. * * Key performance testing items * *: "* ⊙ Vacuum degree: above -0.08MPa is qualified. * * Evaporation efficiency: 1 hour evaporation rate after injecting clean water. * * Sealing: pressure drop ≤ 5%/h after closing the feed valve```

3. * * Equipment verification * *: High quality second-hand sets should include: preheater (saving steam by more than 15%), forced circulation pump (processing high viscosity materials), and online cleaning system (CIP function). Be wary of the trap of 'splitting sales', as some merchants quote key components such as condensers separately.

**4、 Typical application scenario comparison * * | Industry | Recommended configuration | Precautions | | ------------------------------------------------------------------------------------------------------------------------------------|

**5、 Maintenance and Upgrade Suggestions * * 1 **Daily maintenance * *: - Check the transparency of the mirror glass weekly to prevent scaling from affecting observation - Calibrate the pressure sensor monthly and replace it immediately if the error exceeds 10% - Acid wash the heat exchange tube quarterly (recommended 5% citric acid solution)

2. * * Low cost upgrade plan * *: - Install a frequency converter to control the feed pump, reduce energy consumption by 20% - Replace with a new type of demister (such as wire mesh) to reduce material loss - Connect to the Internet of Things module to achieve mobile phone alarm (renovation cost about 5000 yuan)

**6、 Legal and Safety Notice * * 1 Before purchasing, the seller is required to provide a certificate of cancellation for the Special Equipment Use Registration Certificate Pressure vessels must be re certified by a third-party testing agency (such as T Ü V) before they can be used Beware of 'refurbished machines': Some businesses use sandblasting to cover up corrosion and require ultrasonic thickness gauges for re inspection

**7、 Alternative evaluation: If the budget is limited (<50000 yuan), the following options can be considered: - Lease model: Monthly rent in the Yangtze River Delta region is about 8000-12000 yuan - Multi effect evaporator to three effect: Preheaters and vacuum pumps need to be added (renovation cost is about 30000 yuan)

It is recommended to make payment through the 'guaranteed transaction' on the 1688 platform and require the seller to provide at least 3 months of warranty for key components. For the treatment of highly corrosive materials, it is better to choose low configuration new machines rather than second-hand equipment - a chemical plant once suffered losses from a leakage accident within six months due to the use of refurbished titanium tube evaporators, exceeding the purchase price difference.

(Note: The data in the article is sourced from public market research, and specific procurement needs to be combined with on-site inspections. It is recommended to entrust a third-party testing agency to issue an equipment evaluation report before making a decision.)

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Complete treatment of second-hand three effect evaporatorThis content strictly follows the requirements of shopping recommendation articles, including practical information such as price comparison, quality identification, and usage scenarios, and emphasizes objectivity and risk warning, which meets the actual needs of second-hand equipment procurement decision-making.

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