Digital model of boiler heat balance

The normative method (NM) of boilers thermal calculation, repeatedly confirmed and refined, contains the structure of ideas and methods that were retained and adapted during the transition to digital technologies. As applied to the analysis of the heat balance of a boiler with flare furnaces, this required the transformation of a large array of initial and reference data, which cannot be applied unchanged when using a computer. This applies to graphical and tabular data, which form up to 80 % of the volume of NM. To obtain the correlation dependences, the authors use a simple and reliable method of unknown coefficients with the inclusion of a verification algorithm, in the case of equidistant arguments these are the Gregory-Newton coefficients. As shown by a preliminary analysis, for almost all dependencies a polynomial of the second degreesometimes replaced by two polynomials is sufficient. By varying the determining factors in the range of nominal values ±20 %, the model response was obtained in the form of a change in fuel consumption. Quantitatively, all material corresponds to the normative data, is presented in digital format and methodically corresponds to the Mathcad-15 package. In contrast to the well-known works in this area, all factors affecting the heat balance are represented by approximations taking into account the variability of temperature and pressure.