مدل‌سازی دینامیکی بویلر نوع دی با مدار چرخش طبیعی: مطالعه‌ای بر روی عملکرد بویلر در حین تغییر بار پله‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران

2 هیات علمی دانشگاه آزاد اسلامی واحد نجف آباد

3 گروه مهندسی مکانیک، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران.

4 دانشگاه آزاد اسلامی واحد نجف آباد

چکیده

در این مقاله به مدل‌سازی گذرای بویلر نوع دی در حین فرایند تغییر بار پرداخته شد. این نوع بویلرها برای تولید بخار اشباع فرایندی در صنایع کاربرد دارند. در بویلر نوع دی جذب حرارت را می‌توان به دو بخش کوره و بخش جابه‌جایی تقسیم نمود. در این نوع بویلر لوله‌های بخش جابه‌جایی به‌صورت غیرمستقیم در معرض حرارت بوده که منجر به تغییر مسیر جریان از درام (Drum) بالا به پایین و بلعکس شده است. از ویژگی‌های به‌خصوص این بویلر مدار چرخش درام  آن است که به‌صورت طبیعی بوده و در نتیجه معادلات موازنه‌ی هیدرولیکی سیستم نیز باید در نظر گرفته شود. در مدل‌سازی حاضر معادلات سمت آب (در داخل لوله‌ها) به‌صورت یک‌بعدی و معادلات سمت دود با استفاده از روش ناحیه‌ای و به‌صورت سه‌بعدی در نظر گرفته شده‌ است. معادلات پیوستگی و انرژی گذرا در سمت آب تشکیل یک دستگاه معادلات دیفرانسیل معمولی غیرخطی داده که با استفاده از روش رونه-کوتا حل شده است. برای حل معادلات سمت آب و دود به‌صورت برهم کنش دو طرفه، در کار حاضر یک کد رایانه‌ای در محیط نرم‌افزار فرترن توسعه یافته است. بررسی پارامترهای عملیاتی بویلر در هنگام راه‌اندازی می‌تواند در بهبود سیستم کنترلی موجود کمک شایانی کند. نتایج این مدل‌سازی با داده‌های بویلر موردنظر در حین راه‌اندازی سرد مقایسه شد که حداکثر خطا برای فشار بخار، دمای آب درام و دبی بخار خروجی از شیر درام به‌ترتیب برابر 8/4، 1 و 8/6 درصد است. همچنین پاسخ بویلر به افزایش پله‌ای درخواست بخار مصرف کننده، کمتر از 20 ثانیه است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Transient modeling of a D-type boiler with natural circulation loop: a study on boiler performance during a step change in load

نویسندگان [English]

  • Mehdi Hashemi Beni 1
  • Sobhan Emami 2
  • Amir Homayoon Meghdadi Isfahani 3
  • Alireza Shirneshan 4
  • Rasool Kalbasi 3
1 Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 هیات علمی دانشگاه آزاد اسلامی واحد نجف آباد
3 Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
4 Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
چکیده [English]

In this paper, the dynamic modeling of a D-type boiler was performed during a step increase in loading. The D-type boilers are used in industry to produce process saturated steam. In these types of boilers, heat absorption occurs in two sections of the furnace and the convection section. The pipes of the convection section are indirectly exposed to heat, causes the flow direction to change from the upper drum to lower drum and vice versa. One of the special features of this boiler is that the drum circulation loop is natural and as a result, the hydraulic balance equations of the system must be considered. In the present modeling, the equations of water-side were considered in one-dimensional and the equations of flue gas-side were considered in three-dimensional space using the zonal method. The transient continuity and energy equations of the water-side form a system of nonlinear ordinary differential equations which were solved using the Runge–Kutta method. To solve the water and gas-side equations in two-way coupling method, a Fortran computer program has been developed. Investigation of the boiler operating parameters during start-up can help to improve the existing control system. The comparison of the present results with the test data of the desired boiler showed that maximum modelling errors are equal to 4.8, 1, and 6.8 percent for steam pressure, drum water temperature, and outlet steam of boiler during start-up, respectively. Also, the boiler response to a step increase in consumer steam demand is less than 20 seconds.
.

کلیدواژه‌ها [English]

  • Saturated boiler
  • Dynamic modeling- D-Type bolier

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سوخت و احتراق
دوره 15، شماره 1 - شماره پیاپی 38
اردیبهشت 1401
صفحه 25-52

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سابقه مقاله

  • تاریخ دریافت: 08 اسفند 1400
  • تاریخ بازنگری: 18 اردیبهشت 1401
  • تاریخ پذیرش: 01 خرداد 1401

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