Quality appraisal of desulfurization spray pipe

desulfurization spray pipe is based on the core principle of efficient atomization and corrosion resistance. By optimizing the nozzle atomization angle, flow uniformity and material corrosion resistance, it achieves gas-liquid mass transfer efficiency, pressure drop control and long life in the desulfurization tower. It is widely used in flue gas desulfurization systems in industries such as thermal power, steel, chemical industry and waste incineration. In the wet desulfurization process, it is used for the uniform distribution of limestone slurry; in the semi-dry desulfurization process, it meets the atomization spray requirements of activated carbon adsorbents; in highly corrosive flue gas scenarios, it ensures dual corrosion resistance of chloride ions and acid-base media. Compared with metal spray pipes, fiberglass spray pipes have the characteristics of strong anti-scaling, light weight and maintenance-free, and are the core components for the stable operation of the desulfurization system.

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

As environmental protection emission standards become stricter, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1. Dispute over performance indicators: the atomization coverage rate does not meet the standard and the uniformity of slurry distribution exceeds the standard;

2. Material defects: insufficient FRP lamination resin content and poor glass fiber infiltration;

3, process problems: nozzle installation angle deviation, flange connection seal failure;

4, contract performance dispute: key materials (such as vinyl ester resin replaced by phthalate resin) or structural design (such as support spacing > agreed value) are not consistent with the technical agreement.

Litigation identification technical methods for desulfurization sprinkler pipes include:

1. Appearance inspection: Check whether there are defects on the surface of the sprinkler pipe and whether the welds are firm.

2. Dimensional measurement: Measure whether the length, diameter, wall thickness and other parameters of the spray pipe meet the design requirements.

3. Material analysis: Conduct elemental analysis on the material of the sprinkler pipe to determine whether it meets the standard requirements.

4. Corrosion test: Carry out a corrosion test under simulated working conditions on the sprinkler pipe to evaluate its corrosion resistance.

A power plant of the applicant signed an "FRP Spray Pipe Purchase Contract" with an environmental protection equipment manufacturer of the respondent, agreeing that the SO₂ absorption rate is ≥98%. After it was put into operation, the emissions exceeded the standard. The manufacturer argued that it was caused by improper operating parameters.

Identification analysis results:

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

The nozzle atomization angle of the desulfurization sprinkler pipe involved in the case is only 100° (agreement ≥120°), and the coverage rate is only 82%; the FRP resin content is 58% (agreement ≥65%), the interlayer shear strength is only 120MPa (agreement ≥150MPa); the slurry distribution CV value is 0.18 (agreement ≤0.12).

The appraisal conclusion concluded that material and design defects are the main reasons for insufficient desulfurization efficiency.

The desulfurization sprinkler pipe quality appraisal report should include:

1, the purpose of the appraisal (such as attribution of excessive emissions, performance verification) and reference standards (GB/T 19228, ISO 14692, etc.);

2, the model, production batch, and installation record of the sprinkler pipe involved;

3, detection methods and equipment list (such as laser particle size analyzer, SEM);

4, correlation analysis between test data and failure (such as the impact of atomization angle on coverage);