Abstract
An energy analysis and assessment of the feasibility of the development and implementation of a condensing economizer (CE) for steam generator TGM-96A has been made. The condensing economizer is characterized with a very high heating capacity of 21 to 23.5 Gcal/h and will cool the fuel gases from 123°C down to 47°C. The utilized heat will be used to heat three water loops: two loops with District Heating Network water (DHN) and one with raw water from the Dnieper River. The expected improvement in the efficiency of the steam generator is 10.55%. Complete thermal calculations of the condensing economizer have been carried out along with a definition by flow and temperature of the heat carriers. Based on the calculations of the heat and mass transfer processes, the thermal capacity of the economizer under the conditions of partial condensation of water vapor from the flue gases was estimated. The analysis presents an objective assessment of the project’s investments, as well as other financial indicators and environmental benefits that give the investor the opportunity to put the project into operation.
Highlights
The efficient use of fuels in large energy boilers is predominantly related to the utilization of wasted heat from the exhaust gases
One of the ways to increase the energy efficiency is to use state-of-the-art condensing economizers to utilize the heat from the exhaust gases of the steam generators [1, 2, 3]
In [5] it is shown that when the gas is cooled down to 0°C, the amount of heat during condensation is 11.9% relative to the lower heating value (LHV) of the natural gas
Summary
The efficient use of fuels in large energy boilers is predominantly related to the utilization of wasted heat from the exhaust gases. One of the ways to increase the energy efficiency is to use state-of-the-art condensing economizers to utilize the heat from the exhaust gases of the steam generators [1, 2, 3]. The socalled condensing boilers, in which the gas is cooled at temperatures below the dew point (58-60°C), have gained popularity [1, 2, 9]. In these boilers both the physical heat of the gases and the latent heat of condensation are utilized, which allows the fuel efficiency to be. If the heat balance of the steam generator is made by the lower combustion heat, the efficiency reaches 105107% [1, 2, 3, 10]
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