Identification of distillation equipment quality

distillation equipment is based on the core principles of phase balance and mass and heat transfer synergy. By optimizing tray efficiency, reboiler heat load and vacuum sealing, it achieves high-purity separation, energy consumption optimization and safe operation. It is widely used in petrochemical, pharmaceutical, food fermentation and fine chemicals and other fields. In the oil refining industry, it is used for component cutting of crude oil atmospheric and vacuum distillation; in the pharmaceutical field, it meets the needs of solvent recovery and API purification; in the food industry, it ensures the efficient concentration of flavors and fragrances. Compared with traditional equipment, distillation equipment has the characteristics of strong corrosion resistance, excellent automatic control and significant energy saving characteristics. It is the core separation equipment for continuous production.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide distillation equipment quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for distillation equipment quality appraisal.

As the complexity of the process increases, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: product purity does not meet the standard, the leakage rate of the vacuum system exceeds the standard;

2, material defects: insufficient Mo content in the stainless steel tower body, graphite packing ring permeability resistance Poor;

3, process problems: tray level deviation, intergranular corrosion in welding heat-affected zone;

4, contract performance dispute: key modules (such as molecular distillation short-range evaporator, heat pump system) are inconsistent with the technical agreement.

distillation equipment involves the following technical methods:

1. Material composition analysis: analyze the chemical composition and physical properties of the materials used in the equipment, and whether they meet the design requirements and industry standards.

2. Structural dimension inspection: measure the dimensions and tolerances of each component of the equipment to see if they comply with the design drawings and technical parameters.

3. Performance test: Conduct a distillation test on the equipment to evaluate its distillation efficiency, separation effect, energy consumption and other indicators to see whether it meets the contract stipulations.

4. Process flow analysis: Review the process flow design of the equipment to see whether it is reasonable, efficient and in line with industry standards.

A chemical factory of the applicant signed an "Ethanol Distillation Tower Purchase Contract" with an equipment manufacturer of the respondent, stipulating that the purity of ethanol should be ≥99.8%. After being put into production, the purity of the product was only 98.5%. The manufacturer argued that it was caused by too many impurities in the raw materials.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "distillation equipment", contract technical agreements, on-site investigation case materials and other data, and made the following quality analysis opinions:

The distillation equipment involved in the case has a tray level deviation of 4mm/m, resulting in uneven liquid phase distribution; the wall thickness of the reboiler heat exchange tube is reduced by 15% (agreed corrosion allowance ≥2mm), and the thermal efficiency is only 70% (agreed ≥85%); the Mo content of the tower body material is 1.6% (agreed ≥2.0%), and the intergranular corrosion weight loss is 4.2g/m²·h.

The appraisal conclusion concluded that equipment material and structural defects are the main reasons for insufficient purity.

Distillation equipment quality appraisal report should include:

1, appraisal purpose (such as separation failure attribution, safety compliance verification) and referenced standards (GB/T 151, ASME BPV, etc.);

2, equipment model, process parameters, maintenance records involved; 3. Testing methods and equipment list (such as helium mass spectrometer, gas chromatograph);

4, test data and failure relationship Linkage analysis (such as the impact of tray levelness on separation efficiency);

5, clear quality responsibility judgment conclusions and technical basis;