Аннотация
Despite the fact that more and more attention is being paid to the development of nontraditional and renewable energy all over the world, the coal industry continues to be one of the most important industries for the Republic of Kazakhstan. All the main branches of the coal industry are represented in Kazakhstan: mining and processing 3,3 percent of the world's coal reserves are concentrated in the Republic. This paper presents a study of the combustion processes of Karazhyrin coal grade D (lower calorific value is in the range from 18855 to 21788 kJ/kg), which is non-design fuel. The studies were carried out on the operating boiler E-90-3,9/440 at various steam outputs in order to compile a regime map of the boiler. This coal is used not only in the region, but also outside it. In the course of the study, the dependences of the coefficient of performance (COP) of the gross boiler unit on the heat output and steam output were established. As a result of the mathematical processing of the obtained experimental data (for three heat loads of 50 t/h, 75 t/h, 90 t/h), analytical dependencies were obtained that describe the change in gross efficiency and coal consumption depending on the heat and steam output of the boiler, at the same time, the coefficient of determination is within acceptable limits.