Humidification tower quality appraisal

humidification tower is a key equipment for industrial flue gas treatment. It uses water spray atomization to reduce flue gas temperature, increase humidity, prevent condensation and corrosion, and optimize subsequent dust removal efficiency. Its typical application scenarios include:

Cement production: cooling the kiln tail flue gas (from 350℃ to 150℃) to ensure the safe operation of the electrostatic precipitator;

Coal-fired power plant: conditioning the flue gas before desulfurization to improve the utilization rate of desulfurizer;

Iron and steel metallurgy: treating sintering machine flue gas to reduce particulate matter emissions.

my country's humidification tower market exceeds 5 billion yuan, and the gap between the technical level and the international advanced level is gradually narrowing. However, some core components (such as high-pressure atomizing nozzles and wear-resistant linings) still rely on imports. Its performance directly affects the company's environmental compliance (such as dust emission ≤30mg/m³) and production costs (such as reducing power consumption by 15%).

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

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As environmental protection policies become stricter, humidification tower quality disputes occur frequently. The judicial disputes focus on:

1. Disputes over performance indicators: whether flue gas temperature control accuracy (such as ±5℃) and humidity uniformity (such as ±10% RH) meet the standards;

2. Material and process defects: insufficient corrosion resistance of the nozzle material (such as misuse of 316L stainless steel) 304), lining falling off causing air leakage;

3, control system failure: unreasonable PID algorithm parameter setting, lack of liquid level interlock protection function;

4, contract performance issues: the delivered equipment does not match the technical agreement.

0In such cases, quality appraisal needs to be combined with thermodynamic testing, material analysis and working condition simulation to provide technical support for the court to determine liability for breach of contract and promote industry standardization and intellectual property protection.

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Humidification tower quality identification technical methods include:

1, thermodynamic performance test

Infrared thermal imaging camera scans the temperature field in the tower to verify uniformity (standard ±5℃); temperature and humidity sensors monitor inlet and outlet parameters in real time, and calculate heat exchange efficiency (such as ≥85%).

2, spray system evaluation

Laser particle size analyzer measures atomized particle size distribution, high-speed camera analyzes spray morphology; weighing method detects nozzle flow stability (deviation ≤±2%), water quality analysis determines scaling risk (such as calcium hardness ≤50mg/L).

03, material and structure testing

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2 ultrasonic thickness gauge detects the tower wall thickness reduction rate (such as annual corrosion rate ≤ 0.1mm); X-ray diffraction (XRD) analyzes the lining mineral composition to verify acid and alkali resistance (such as mullite content ≥ 60%).

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44, control system verification

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6 step response test tests the rationality of PID parameter setting (such as overshoot ≤ 10%); air leakage rate test (such as thermal balance method) verifies the structural sealing (standard ≤3%).

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85, failure mode analysis

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0 Scanning electron microscope (SEM) was used to observe the wear morphology of the nozzle, and energy dispersive spectrometer (EDS) was used to detect the fouling components; finite element simulation was used to analyze the stress distribution of the tower body and evaluate the risk of lining shedding (such as the maximum stress ≤ 80% of the material strength).

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A cement factory of the applicant signed a "Humidification Tower Procurement Contract" with an environmental protection equipment company of the respondent, agreeing to purchase 2 sets of equipment with a daily processing capacity of 50,000m³ for cooling the flue gas at the kiln tail. After being put into operation, the flue gas outlet temperature fluctuated by ±15°C, and the efficiency of the electrostatic precipitator dropped to 80% (standard ≥99%), resulting in excessive dust emissions. The cement plant believed that the equipment had design defects and demanded compensation for losses. The equipment company argued that the problem stemmed from abnormal water quality or improper operation, and both parties went to court.

Identification analysis results:

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

The nozzle material of the humidification tower involved in the case is 304 stainless steel (316L required by the contract), and the Cr content is only 18% (standard ≥16%), insufficient corrosion resistance; the lining material is ordinary high-alumina bricks (acid-resistant bricks required by the contract), and the strength dropped by 40% after the immersion test. The calibration error of the temperature sensor reached ±8°C, and the PID parameters did not adapt to the fluctuating flue gas flow; the liquid level interlock protection threshold was set too high (1.2m), and water was not replenished in time, resulting in water outage.

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The humidification tower 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.).

05. Identification conclusion.

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26. Signature and seal of the appraiser, and official seal of the appraisal institution.

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