Dust collector quality appraisal

dust collector takes multi-stage filtration and gas-solid separation as its core principles. By optimizing the filter material structure, airflow distribution and dust removal system design, it achieves the synergy of efficient particle capture and low-resistance operation. It is widely used in high-pollution industries such as electric power, metallurgy, building materials, and chemicals. In coal-fired power plants, it is used for deep purification of dust after flue gas desulfurization; in the field of steel smelting, it achieves ultra-low emissions of blast furnace gas and converter smoke; in cement production, it controls the PM2.5 concentration of kiln exhaust gas; in chemical plants, it ensures occupational exposure limits for toxic dust. Compared with traditional dust removal equipment, dust collectors have the characteristics of high filtration accuracy (up to 99.99%), low energy consumption, and high degree of automation. They are the core equipment for industrial environmental protection standards and clean production.

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

As environmental protection supervision becomes stricter, dust collector quality dispute cases are on the rise. The focus of judicial disputes is:

1. Disputes over performance indicators: whether the measured emission concentration exceeds the value agreed in the contract and whether the equipment resistance exceeds the standard;

2. Material defects: insufficient thickness of PTFE coating on filter bags, cage steel The corrosion resistance of the material is not up to standard;

3. Process problems: The poor air tightness of the flower plate hole welding leads to an air leakage rate of >3%, and the fatigue life of the pulse valve diaphragm is insufficient;

4. Contract performance dispute: key components do not match the technical agreement.

Dust collector quality identification technical methods mainly include:

1. Dust removal efficiency test

uses a standardized aerosol generator and a laser particle size analyzer to measure the particle concentration at the inlet and outlet of the dust collector to calculate the dust removal efficiency.

2. Air volume test

Use an anemometer or pitot tube to measure the wind speed at the inlet and outlet of the dust collector fan and calculate the air volume.

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A cement factory of the applicant signed a "Bag Dust Collector Purchase Contract" with an environmental protection company of the respondent, purchasing 3 LMC-6000 equipment for dust removal at the end of the kiln. After 6 months of operation, the dust collector emission concentration continued to exceed the standard (actually measured 35mg/m³, contract requirement ≤15mg/m³), and was punished by the environmental protection department. The cement plant claimed that the filter bag was defective, and the environmental protection company argued that it was caused by the operator's failure to replace the damaged filter bag in time.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "dust collector", contract technical agreement, on-site investigation case materials and other data, and made the following quality analysis opinions: HTMLTAGT The thickness of the PTFE coating of the OKEN5

filter bag involved was only 0.8μm (contract requirement ≥1.5μm), with large areas of peeling off the surface; the air leakage rate at the flower board welding joint reached 4.2% (standard ≤2%), resulting in an airflow short circuit; the chromium content of the cage steel was only 15.2% (standard 16.5%-18.5%), and its resistance to chloride ion corrosion was insufficient.

The appraisal conclusion concluded that the environmental protection company failed to select qualified filter materials and metal materials in accordance with the technical agreement, and that defects in the welding process were the main cause of excessive emissions.

The dust collector quality appraisal report should include the following content:

1. The purpose and basis of the appraisal.

2. Model, specification, manufacturer and other information of the equipment being identified.

3. Identification method.

4. Identification results (including whether there are quality problems, causes of problems, etc.).