دانلود مقاله ISI انگلیسی شماره 53411
عنوان فارسی مقاله

اثر نفوذ هوا بر روی عملکرد انرژی نیروگاه های حرارتی زغال سنگ

کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
53411 2007 11 صفحه PDF سفارش دهید محاسبه نشده
خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.
عنوان انگلیسی
Effect of air ingress on the energy performance of coal fired thermal power plants
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Energy Conversion and Management, Volume 48, Issue 7, July 2007, Pages 2150–2160

کلمات کلیدی
ورود هوا؛ O2 در گاز دودکش؛ هوای اضافی - دیواره آب از نوع غشاء؛ ضریب ظرفیت؛ بهره وری بویلر؛ بهره وری ناخالص کلی
پیش نمایش مقاله
پیش نمایش مقاله اثر نفوذ هوا بر روی عملکرد انرژی نیروگاه های حرارتی زغال سنگ

چکیده انگلیسی

Ingress of air in boilers leads to drops in energy efficiency. This paper presents the effects of air ingress in the combustion zone, post-combustion zone and air pre-heater (APH) on the energy efficiency and loading capacity of a coal fired thermal power plant operating on fuel with high ash (35–45%). The optimal O2 in the flue gas for a pulverized coal fired system is 3.5% (corresponding to 20% excess air). The operating values are in the range of 4.2–6.0% in membrane type boilers and up to 10% in refractory type boilers (after sustained periods of operation). The leakage rate of boilers (up to the entrance of the APH) is designed at 0.2% while the average operating values are 7.25% for membrane type enclosures and 33.61% for refractory enclosures. The leakage rate of the APH is designed at 5.0% while the operating values range from 13.66% to 20.13% for rotary and tubular APHs. When the O2 in the combustion zone varies from 3.5% to 8.0%, efficiency drops of 2.0% points are experienced in the boiler and turbine separately, and the gross overall efficiency drop is ∼3.0% points. The units do not experience any capacity drop up to an O2 in the flue gas of 6.0% before the APH. At an O2 in the flue gas (before APH) of 7.2%, a mild limitation on the unit capacity of around 2–3% is experienced. When O2 in the flue gas (before APH) reaches a level of 9.0%, 20% capacity drop of the unit is experienced due to which the plant load cannot be raised higher than 80%. Beyond the level of 9.0% (rare occurrence), the unit is quite difficult to operate and has to be taken off for overhaul.

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