ПAРAМЕТРИЧЕCКИЙ AНAЛИЗ CХЕМЫ ПAРОГAЗОВОЙ УCТAНОВКИ C КОМБИНAЦИЕЙ ТРЕХ ЦИКЛОВ ДЛЯ ПОВЫШЕНИЯ КПД ПРИ РAБОТЕ В CЕВЕРНЫХ ГAЗОДОБЫВAЮЩИХ РAЙОНAХ

Результат исследований: Материалы для журналаСтатья

1 Цитирования (Scopus)

Аннотация

The relevance. Combined/cycle gas turbines are considered as one of the promising directions in development of thermal power plants operating on natural and synthesis gas. The interest in their introduction in Russia is caused by large reserves of natural gas, low capital investment and minimal emissions of harmful substances into the environment. It is known from thermodynamics that in order to achi/ eve high cycle efficiency, it is necessary to have a high heat supply temperature and low heat removal temperature, and to ensure equip/ ment operation with minimal internal losses, and to have a rational thermal scheme of equipment interconnection in a cycle. At the pres/ ent stage, the maximum temperature of heat supply in the combustion chamber of a gas turbine installation with existing structural ma/ terials and methods for cooling turbine elements has reached 1600 °C, and heat removal temperature in the condenser during the ope/ ration of the Rankine cycle on water cannot be lower than 15 °C. Under these conditions, the electric efficiency of 63 % is achieved at the most advanced three/loop combined/cycle gas turbine with intermediate superheating of steam. For the Rankine cycle when wor/ king on water, the condensation temperature of the steam should be above 0 °C according to the freezing condition. For a combined/cy/ cle plant, when operating in conditions of low average annual ambient temperatures, which is typical for Russia and especially remote northern gas production areas, heat can be removed in the Rankine cycle well below 0 °C, but this can be done reliably only by using air/ cooled condensers, if an organic working body is used as a working body in the Rankine cycle. The disadvantage of modern organic wor/ king fluid is the low limiting temperature of their thermal decomposition, which is usually below 300...400 °C. Subject of the research is combined/cycle plants with cycles on three working bodies, where the upper cycle of a gas turbine unit ope/ rates on gas combustion products, the middle cycle of a steam turbine unit operates on water and steam in the temperature range of 100…650 °C, and the lower cycle – Organic Rankine cycle operates on organic working fluid in the range of temperatures –30…200 °C. The aim of the study is the choice of a rational technological diagram of a combined/cycle plants using cycles on three working bodies and an air condenser to enable reliable heat removal from the organic working fluid at temperature below 0 °C and to determine the op/ timal parameters of the cycles. Methods. Complex heat and power systems, including steam and gas installations, are characterized by a variety of processes occurring in their elements. Such installations can be effectively investigated only with the help of mathematical modeling and optimization me/ thods. When conducting research the authors have applied a systematic approach, methods of energy balances and the calculation of thermodynamic and thermophysical property of working bodies using modern certified programs. Results. The authors developed the original diagram of a combined/cycle gas turbine unit with cycles on three working bodies. In this di/ agram, the Brighton upper cycle operates on combustion products of natural gas, the average Rankine cycle operates on water and wa/ ter vapor, the lower – Organic Rankine cycle operates on organic working fluid with condensation in an air condenser. The mathemati/ cal model and a program for calculating the proposed scheme was developed. The authors carried out the parametric analysis of the cy/ cles main parameters influence on the efficiency and power of the combine cycle gas turbine and determined the most effective orga/ nic working fluid for the lower Rankine cycle.

Переведенное названиеParametric analysis of the diagram of the combined7cycle gas turbine with a combination of three cycles for improving efficiency when operating in northern gas producing areas
Язык оригиналаРусский
Страницы (с-по)44-55
Число страниц12
ЖурналBulletin of the Tomsk Polytechnic University, Geo Assets Engineering
Том330
Номер выпуска5
DOI
СостояниеОпубликовано - 1 янв 2019

Keywords

  • Air condenser
  • Combined/cycle gas turbine
  • Math modeling
  • Organic Rankine cycle
  • Organic working bodies

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology
  • Waste Management and Disposal
  • Economic Geology
  • Management, Monitoring, Policy and Law

Fingerprint Подробные сведения о темах исследования «ПAРAМЕТРИЧЕCКИЙ AНAЛИЗ CХЕМЫ ПAРОГAЗОВОЙ УCТAНОВКИ C КОМБИНAЦИЕЙ ТРЕХ ЦИКЛОВ ДЛЯ ПОВЫШЕНИЯ КПД ПРИ РAБОТЕ В CЕВЕРНЫХ ГAЗОДОБЫВAЮЩИХ РAЙОНAХ». Вместе они формируют уникальный семантический отпечаток (fingerprint).

  • Цитировать