Kettle type fine tower quality appraisal

kettle type refining tower is based on the core principles of multi-stage gas-liquid mass transfer and thermodynamic balance. By optimizing the tray structure, reboiler thermal efficiency and reflux ratio control, it achieves the synergy of high-purity separation, energy efficiency optimization and operational stability. It is widely used in petrochemical, fine chemical, pharmaceutical, environmental recycling and other fields. In the petrochemical industry, it is used to separate light hydrocarbon components in crude oil distillation; in the pharmaceutical field, it meets the purification needs of high value-added solvents; in environmental protection projects, it realizes the regeneration and recovery of waste solvents. Compared with packed towers, kettle-type polishing towers have the characteristics of large processing capacity, strong resistance to clogging, and wide operating flexibility. They are the core separation equipment for continuous production.

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

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

1, performance index dispute: whether the separation purity meets the standard, tower top temperature control deviation;

2, material defects: insufficient Cr/Ni content in the stainless steel of the tower body, The corrosion-resistant coating of internal components peels off;

3. Process problems: Tray level deviation, sensitivity to intergranular corrosion in the welding heat-affected zone;

4. Contract performance dispute: key configurations are inconsistent with the technical agreement.

1. Appearance inspection: Check whether the appearance of the tower body meets the standards and whether there are any abnormalities such as defects, deformation, corrosion, etc.

2. Dimensional measurement: measure the dimensions of each main component of the tower and compare it with the design drawings to determine whether it meets the requirements.

3. Material inspection: Carry out sampling inspection on the tower body materials, analyze their chemical composition and mechanical properties, and determine whether the materials meet the standards.

4. Structural strength test: Conduct static or dynamic structural strength test on the tower body to evaluate whether its bearing capacity meets the usage requirements.

5. Performance test: Under actual mineral processing conditions, test the mineral processing performance of the tower, including concentrate recovery rate, concentrate grade, tailings grade and other indicators.

A chemical company of the applicant signed a "50m³/h Methanol Refining Tower Procurement Contract" with an equipment manufacturer of the defendant, and it was agreed that the purity of methanol should be ≥99.8%. After being put into production, the purity of the product was only 99.2%. The manufacturer argued that it was caused by fluctuations in the feed components.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information, contract technical agreements, on-site inspection case materials and other data of the "Kettle Type Refining Tower" and made the following quality analysis opinions:

The tray level deviation of the kettle-type polishing tower involved in the case was 4mm/m (agreement ≤2mm/m), resulting in uneven distribution of the liquid phase; the Cr content of the tower weld was 15.5% (agreement ≥16%), and the intergranular corrosion weight loss was 4.2g/m²·h; the hydraulic test showed that the tray efficiency was only 72% (agreement ≥85%).

The appraisal conclusion concluded that the material and structural defects of the tower were the main reasons for insufficient separation efficiency.

Kettle type polishing tower quality appraisal report should include:

1, appraisal purpose and reference standards;

2, specifications of the pipe involved, production batch number, construction record;

3, testing method Methods and equipment list;

4, correlation analysis of test data and failure;