Kyiv National University of Construction and Architecture (KNUCA)
VENTYLIATSIIA, OSVITLENNIA TA TEPLOHAZOPOSTACHANNIA
scientific and technical collection
This work is licensed under a Creative Commons Attribution 4.0 International License.
M. P. Senchuk, PhD, associate professor. Kiev National University of Construction and Architecture, Kiev, Ukraine, firstname.lastname@example.org, ORCID: 0000-0001-8968-7336
Operational Efficiency оf Solid-Fuel Heat Generators оf Low Heat Production
Abstract. In the article the problem of the negative influence of pollution of heating surfaces of solid-fuel heat generators on the operational efficiency of their work is considered. It is shown that the influence of the contamination of heat exchanging convective surfaces, in particular tubular type, in the design of heat generators is taken into account by normative coefficients of thermal efficiency, the magnitude of which is averaged and does not take into account the features of the design of the convective package, different methods of intensification, as well as the differences in the combustion process of different types and the quality of solid fuel. The well-known methods of intensification of convective heat exchange are analyzed, features of the design of the most common intensifiers in flue pipes in heat generators of small heat output are described and their arrangement with different types of water-heating boilers is described: fire-tube, flame-fired, water-tube and fire-tube and panel. Calculated studies of the influence of the degree of pollution of flue pipes on different levels and methods of intensification of heat exchange on the economic parameters of solid-fuel heat generator. The structure of the water pipe and flue system profile was analyzed for the effect of the degree of pollution of the flue pipes: smooth, with ring knitting and with screw ribbon inserts on the magnitude of the efficiency of the heat generator. Influence of the degree of contamination of flue pipes: for smooth, with ring knitting and with screw ribbon inserts on the magnitude of the efficiency of the heat generator, was analyzed for the structure with the water pipe and flue system of the profile. The relationship between constructive solutions at the stage of development of the heat generator and conditions of its operation on fuels of different quality, in particular, the need to take into account the degree of restoration of the purity of heat exchange surfaces during their periodic cleaning, is considered in order to provide normative performance indicators for the long-term operation of the solid-fuel heat generator.
Key words: solid fuel boiler, furnace, heating surface, convection packet, flue pipes, pollution of heat exchange surfaces, turbulators of gas flow