Boiler Kiln Quality Identification

boiler kilns are based on the core principles of efficient combustion and heat energy transfer. By optimizing the furnace structure design, high temperature resistant material selection and thermal control system, they achieve synergy between thermal efficiency improvement and emission control. They are widely used in fields such as power production, chemical industry, metallurgy and heating. In thermal power plants, it is used for steam generation and turbine driving; in the chemical industry, it meets the high-temperature heating needs of reactors; in the metallurgical field, it ensures the continuous and stable operation of smelting furnaces; in urban heating systems, it realizes low-carbon conversion of regional heat energy. Compared with traditional equipment, boilers and furnaces have the characteristics of high thermal efficiency, low pollutant emissions, and high degree of automation. They are the core equipment for efficient utilization of industrial energy.

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

With the upgrade of environmental protection and energy efficiency standards, cases of boiler and kiln quality disputes have increased significantly. The focus of judicial disputes is:

1. Disputes over performance indicators: whether the measured thermal efficiency meets the standard (for example, the contract stipulates ≥92%, and the actual measurement is ≤88%), and whether the exhaust gas temperature exceeds the standard;

2. Material defects: The thermal shock stability of the furnace refractory castable is insufficient. , Cr content deviation of heat-resistant steel;

3. Process problems: Welding defects of pressure-bearing parts, failure of sealing of waste heat recovery device, resulting in air leakage rate > 5%;

4. Contract performance dispute: burner model, control system module and technical agreement are inconsistent.

Boiler and kiln quality appraisal technical methods include:

1. Visual inspection: Conduct a detailed inspection of the appearance, internal structure, and key components of the equipment to find out whether there are defects such as deformation, cracks, corrosion, etc.

2. Non-destructive testing: Use ultrasonic flaw detection, radiographic flaw detection and other methods to detect whether there are hidden defects inside the equipment, such as cracks, pores, inclusions, etc.

3. Material performance testing: Conduct chemical analysis, mechanical property testing, etc. on equipment materials to evaluate the quality of materials and whether they meet specification requirements.

4. Functional test: Carry out a trial run on the device to observe whether it can work normally and meet the design requirements.

A thermal power company of the applicant signed a "75t/h Circulating Fluidized Bed Boiler Purchase Contract" with a boiler factory of the respondent, agreeing that the thermal efficiency is ≥91%. After half a year of operation, the exhaust gas temperature continued to exceed 170°C, and coal consumption increased by 15%. The heating company accused the company of design defects, and the manufacturer argued that it was caused by excessive coal particle size.

identification and analysis results:

The quality analysis expert group discussed and synthesized technical data on "boiler kilns" related information, contract technical agreements, on-site inspection case materials and other data After analysis, the following quality analysis opinions were made:

The ash thickness of the heated area at the rear of the boiler exceeded the design value by 3 times, the air leakage rate of the air preheater reached 12% (standard ≤6%); the Cr content of the high-temperature superheater material was only 8.2% (Cr required by the agreement 12Cr1MoVG 9-12%), resulting in an accelerated oxidation rate of the tube wall; the PID parameters of the DCS system combustion control module were not debugged according to the technical agreement.

The appraisal conclusion concluded that the boiler factory failed to fulfill its thermal calculation verification obligations, and defects in materials and control systems were the main reasons for insufficient energy efficiency.

Boiler and kiln quality appraisal report mainly includes the following contents:

1. Client information

2. Appraisal equipment information

3. Appraisal basis (standards, power of attorney, etc.)

4. Identification method