Analysis of deposits in superheater tubes at coal-fired thermal power plants by Fourier IR spectroscopy

Abstract

THE PURPOSE. Determination of the qualitative composition of deposits on the inner surface of the superheater tubes of the Aksuskaya GRES and CHPP stations of Aluminum Kazakhstan JSC located in the Republic of Kazakhstan. METHODS. The most modern method of analysis is IR spectrophotometry, which is based on the absorption of IR radiation. Sediment analysis was carried out on an infrared spectrophotometer with Fourier transform of Shimadzu IRAffinity-1S. The peculiarity and justification of using this device is based on the high throughput of optics. A complementary function is a combination with a dynamic digital adjustment system. The DLATGS detector is used as a powerful ceramic radiation source. This detector is highly sensitive and thermally stabilized. RESULTS. As a result of the analysis, it was found that the deposits on the inner surface are represented by metal corrosion products and heat-resistant humus substances. The latter easily pass into steam from boiler water (steam distillation) and settle on the surface of the tubes. Also, mineral substances and silicates are present as impurities, which also pass into steam in a small amount. CONCLUSION. As a result of the analysis of deposits in superheater tubes at the stations of Aksuskaya GRES and CHPP of Aluminum Kazakhstan JSC located in the Republic of Kazakhstan, it was found that corrosion processes are quite intense, therefore corrosion products predominate in the deposits. To reduce the internal wear of the tubes, it is necessary to adjust the VCR, analyze the reagents used, and perform a step-by-step analysis of the coolant at each stage of cleaning.