Abstract
Further improvement of natural gas usage in power industry is associated with transition to the combined-cycle gas technology, primarily at combined heat and power plants (CHP). Renovation of technology of conversion of fuel energy into heat and electricity flows is effective while it is performed simultaneously with the elaboration of thermal circuits of CHP by insertion heat accumulators and absorption lithium bromide heat pumps (ALBHP) in the structure of CHP; the mentioned insertion amends thermodynamic as well as economic and environmental indicators of CHP renovation and also develops CHP maneuverability. The ability of CHP to provide heat in required quantity, their capacity to change electricity generation output without excessive fuel consumption is extremely relevant for the energy system that incorporates thermal power plants as dominating component. At the same time the displacement of traditional electrical power regulators take place. Implementation of projects of this kind requires the elaboration of CHP flow diagram calculation methods and determining relevant indicators. The results of the numerical study of the energy characteristics of CHP with the aid of the topological models of the existing heat flow diagrams of CHP that incorporate ALBHP for recovery of low-temperature waste of heat flows of systems of cooling water circulating are presented in the article. An example of calculation, the results of the CHP thermodynamic efficiency evaluation, the change of the energy characteristics for different modes of operation of CHP caused by implementation of ALBHP are shown. The conditions for the effective application of lithium bromide absorption heat pumps are specified, as well as the rate of increase of thermodynamic efficiency; the changes of maneuverability of CHP with high initial parameters are identified, the natural gas savings in The Republic of Belarus are determined.
Highlights
Белорусский национальный технический университет Belаrusian National Technical University просп
The ability of combined heat and power plants (CHP) to provide heat in required quantity, their capacity to change electricity generation output without excessive fuel consumption is extremely relevant for the energy system that incorporates thermal power plants as dominating component
Implementation of projects of this kind requires the elaboration of CHP flow diagram calculation methods and determining relevant indicators
Summary
1)Белорусский национальный технический университет (Минск, Республика Беларусь), 2)РУП «БелТЭИ» (Минск, Республика Беларусь). Модернизацию технологии преобразования энергии топлива во вторичные энергопотоки эффективнее производить совместно с развитием тепловых схем ТЭЦ путем введения в их структуру тепловых аккумуляторов, абсорбционных бромисто-литиевых тепловых насосов, что обеспечивает не только улучшение энергетических, экономических и экологических показателей модернизации, но и развивает ТЭЦ в плане маневренности. Приведены результаты численного исследования энергетических характеристик ТЭЦ с помощью топологических моделей существующих тепловых схем ТЭЦ, в которые интегрированы абсорбционные бромисто-литиевые тепловые насосы для утилизации вторичных низкотемпературных тепловых потоков систем циркуляционного охлаждения. Результаты оценки термодинамической эффективности ТЭЦ и изменение их энергетических характеристик для различных режимов работы в результате внедрения абсорбционных бромисто-литиевых тепловых насосов в состав ТЭЦ. Определены условия эффективного применения таких насосов, степень повышения термодинамической эффективности, изменения маневренности ТЭЦ повышенных начальных параметров и системная экономия природного газа в условиях Беларуси. 1)Belarusian National Technical University (Minsk, Republic of Belarus), 2)“BelTEI” Republican Unitary Enterprise (Minsk, Republic of Belarus)
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