Fan blade scrap appraisal

Wind turbine blades have been working in extreme environments for a long time, and various problems will inevitably occur. The most common ones are surface wear, cracks, fatigue fractures, etc. Blade surface wear and cracks are caused by the friction and vibration of the blades exposed to wind for a long time, while fatigue fracture is caused by the blades being continuously bent under repeated loads for a long time. If these conditions develop to a certain extent, the blades will lose their original stability and strength and eventually be scrapped.

As an independent third-party appraisal agency under Guoke Holdings, Zhongke Testing has the qualifications for fixed asset scrapping appraisal. It can organize technical personnel to evaluate the assets to be scrapped and evaluate and issue a wind turbine blade scrapping appraisal report based on the list of assets to be scrapped and relevant information provided by the client.

Different types of wind turbine blades have different damage and scrap standards, including normal wear, slight surface scratches, cracks, defects, damaged area and other factors. The specific standards should be jointly determined by the manufacturer and the property owner.

1. Defects in wind turbine blades include bubbles, holes, unqualified materials, etc., which will gradually expand and damage the blade structure during use, leading to failure. Generally, scrapping is only required when the size of the defect is large enough to endanger the overall structural safety of the blade.

2. The damaged area of wind turbine blades refers to the percentage of the damaged blade surface to the total area. If the damaged area exceeds a certain value, it may affect the structural integrity of the blade. Generally, the damaged area cannot exceed 5% of the entire blade surface area.

1. Appearance inspection: Check whether there is any obvious damage, cracks, deformation or other damage on the surface of the blade. This may include inspecting the blade's edges, attachment points, internal structure and coatings.

2. Acoustic inspection: Using ultrasonic or other acoustic inspection technology to scan the blade to detect internal cracks, holes or other defects. These techniques can provide information about the structural integrity of the blade.

3. Structural inspection: Perform physical tests on the blades, such as bending or tensile tests, to evaluate their structural strength and stiffness. This can help determine whether the blade has lost the mechanical properties it was designed for.

4. Vibration analysis: Assess the dynamic characteristics of the blade by monitoring its vibration levels. Unusual vibrations may indicate problems with the blades, such as imbalance, fatigue, or material damage.

5. Infrared thermal imaging: Use infrared thermal imaging technology to scan blades to detect possible hot spots, temperature anomalies or thermal runaway phenomena. This can help uncover hidden flaws or glitches.

A certain power generation company has a batch of wind turbine blades that due to use and safety requirements, the original equipment has been updated. In order to determine whether this batch of equipment has reached a scrapped state, we have entrusted our company to evaluate whether the wind turbine blades have reached a scrapped status.

Identification analysis results:

Identification analysis The expert group conducted on-site inspection and investigation results on the wind turbine blades commissioned for identification and evaluation, and made the following suggestions and conclusions:

This batch of wind turbine blades are no longer usable and have reached the scrapping condition.

1. Equipment list sorting: First, it is necessary to sort out the list of all equipment, including the name, model, specification, quantity, purchase date and other information of the equipment.

2. Equipment condition assessment: Evaluate the condition of the equipment based on its usage and maintenance records. It can be carried out through regular inspections, random inspections, etc.

3. Expert appraisal: For some highly professional equipment, experts in related fields need to be invited for appraisal. Experts can evaluate the condition of the equipment based on its performance testing, technical indicators and other factors.

4. Processing decision making: Based on the identification results of the device, make corresponding processing decisions. If the equipment can be repaired or upgraded, it needs to be processed accordingly; if the equipment cannot continue to be used or the repair cost is too high, it needs to be scrapped.

5. Execution of equipment scrapping: Dispose of scrapped equipment in accordance with relevant regulations and procedures. For example, recycling, dismantling, and destruction of equipment. At the same time, appropriate record and file management work needs to be done.