Abstract
This paper describes significance and necessity of PTVM hot-water boilers modernization and substitution by hot-water boilers with higher efficiency rates and improved ecological indexes. It also describes an analysis performed in relation to different ways of PTVM-100 boilers modernization across CIS countries, which were aimed at extension of boiler’s heat efficiency period working on natural gas and fuel oil. Results of this analysis showed that the issue of ash and soot formation on convective surfaces during operation of boiler on fuel oil, which is directly connected with high exhaust temperatures of PTVM-100 furnace chamber, is still remains to be unsolved. Designs of new hot-water boilers KV-GM-42 and KV-GM-145 with bi-radiated screens and optimized convective heating surfaces, suggested by authors of this paper, are considered to fit the old series of boilers, and allow to have efficiency rate at about 93% level. This paper contains assessment of economical and ecological effects, which are going to be used as grounds for substitution of hot-water boilers that have come to the end of their service lifetime. Assessment was performed based on current tariffs and normative acts and in accordance with statistics data across the Republic of Kazakhstan.