Appraisal of kiln quality in power plants

power plant furnaces take the synergy of high-temperature combustion and thermal energy conversion as the core principle. By optimizing thermal efficiency, high-temperature resistance and environmental protection indicators, they achieve efficient conversion of coal/gas, synergy between ash melting rate and system continuity. They are widely used in thermal power generation, waste incineration and biomass energy utilization. In ultra-supercritical units, it is used to maximize steam parameters; in circulating fluidized bed boilers, it meets the clean combustion of high-sulfur coal; in waste heat power generation, it ensures cascade recovery of flue gas heat energy. Compared with traditional boilers, power plant furnaces have the characteristics of low heat loss, intelligent combustion control, and ultra-low emissions (SCR/SNCR collaborative denitration). They are the core equipment for efficient energy utilization.

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

As environmental protection and energy efficiency regulations become stricter, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: steam parameters do not meet the standards, exhaust heat loss is >agreed value;

2, material defects: water-cooled wall tube T91 steel has insufficient Cr content, refractory castables are resistant to Poor thermal shock resistance;

3, process problems: membrane wall seam gaps, uneven air distribution in the burner;

4, contract performance disputes: core modules (such as imported soot blowers, intelligent combustion control systems) are inconsistent with the technical agreement.

Power plant furnace litigation quality appraisal technical methods mainly include:

1. Visual inspection: Check whether the appearance of the furnace body, pipes, valves, etc. is defective, rusty, deformed, etc.

2. Non-destructive testing: Use non-destructive testing methods such as ultrasonic and radiation to detect defects in furnace pipes, welds, components, etc.

3. Performance test: Carry out performance tests on combustion, thermal engineering, environmental protection and other aspects of the furnace to verify whether it meets the design requirements.

4. Material analysis: The chemical composition and mechanical properties of the materials used in the furnace are tested to determine whether the quality of the materials meets the specifications.

A power plant of the applicant signed a "600℃ Ultra-Supercritical Boiler Purchase Contract" with an equipment manufacturer of the respondent, agreeing that the thermal efficiency is ≥93%. After being put into operation, the actual measurement was only 88%. The manufacturer argued that it was caused by the low calorific value of coal.

Identification analysis results:

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

The Cr content of the water-cooled wall tube of the furnace of the power plant involved in the case is 7.5% (agreed 8.0-9.5%), and the oxidation rate in the high-temperature section exceeds the agreed value by 2 times; uneven air distribution in the burner causes the carbon content of fly ash to be ≥8% (agreed ≤4%); the gap between the membrane wall seams is 1.2mm (agreed ≤0.5mm), and the air leakage rate increases by 1.5%.

The appraisal conclusion identified material and design defects as the main cause of insufficient energy efficiency.

The power plant furnace and kiln quality appraisal report should include:

1, the purpose of the appraisal (such as attribution of energy efficiency disputes, environmental compliance verification) and reference standards;

2, the equipment model involved, design parameters, operation logs;

3, testing methods and equipment list (such as Flue gas analyzer, creep testing machine);

4, correlation analysis between test data and failure (such as the impact of Cr content on oxidation rate);