NUMERICAL ANALYSIS OF 330 MWth ÇAN POWER PLANT CIRCULATING FLUIDIZED BED BOILER BY COMPUTATIONAL PARTICLE FLUID DYNAMIC METHOD

Year 2019, , 441 - 451, 26.06.2019

Barış Gürel , Osman İpek

https://doi.org/10.21923/jesd.471097

Abstract

CFBB
(Circulating Fluidized Bed Boiler) systems that is foregoing as efficiency and enviromental
combustion of the low quality lignites that have %88 in the Turkish lignites.
In the present study, Çan TS numerical analysis were conducted by
CPFD(Computational Particle Fluid Dynamics) method with it was reached that boundary
conditions and geometrical knowledges of the Çan TS CFBB system by otomation and
control room. Pressure, temperature, O₂, CO₂, H₂O
and SO₂ mole fraction changing in the combustion chamber were investigated
in the numerical analysis. In the study results, pressure, temperature, O₂,
CO₂, H₂O and SO₂ mole fraction of the bottom
of the furnace is relatively 108401 Pa, 1093 K, 0,01, 0,04, 0,077, 0,005 and pressure,
temperature, O₂, CO₂, H₂O and SO₂ mole
fraction of the exit of the furnace is relatively 103347 Pa, 1015 K, 0,081,
0,05, 0,049, 0,003. It is showed that very good compliance with numerical and practical
results.Also, important emissions and particule hydrodynamic flow are modelled with
combustion and pressure properties by improved mathematical model. It is showed
that, mathematical model that is improved by CPFD method will have great benefits
in modeling studies. As a result of the study,it is showed that optimizable of
the small and large capacity(0,5-100 MW_th) of the CFBB systems with
CPFD method using validated numerical model.

Keywords

Circulating fluidized bed boiler, Computational Particle Fluid dynamics, Combustion, Particle hydrodynamic flow, Numerical analysis

330 MWth ÇAN DOLAŞIMLI AKIŞKAN YATAKLI TERMİK SANTRAL KAZANININ HESAPLAMALI PARTİKÜL AKIŞKANLAR DİNAMİĞİ METODUYLA SAYISAL ANALİZİ

Abstract

Son
yıllarda Türkiye linyitlerinin %88’ini oluşturan düşük kaliteli linyitlerin
temiz ve verimli bir şekilde yakılabilmesini sağlayan en önemli yakma
teknolojisi olarak CFBB (Dolaşımlı Akışkan Yataklı Kazan) sistemleri öne
çıkmaktadır. Bu çalışmada, çalışır durumda ve 330 MW_th kapasitesindeki
ÇTS (Çan Termik Santrali) CFBB sistemine ait otomasyon odasından alınan sınır koşulları
ve yanma odası geometrik parametreleri dikkate alınarak, CPFD (Hesaplamalı
Partikül Akışkanlar Dinamiği) metodu yardımıyla sistemin sayısal analizi gerçekleştirilmiştir.
Analizlerde, yanma
odasındaki basınç, sıcaklık, O₂, CO₂, H₂O ve
SO₂ mol oranlarındaki değişimler incelenmiştir. Elde edilen analiz sonuçlara
göre,  ÇTS kazan tabanındaki basıncın 108401
Pa,   sıcaklığın 1093 K, mol oranları ise
O₂ için  0,01,  CO₂ için 0,04, H₂Oiçin 0,077
 ve SO₂ için 0,005 olduğu
gözlemlenirken, kazan çıkışındaki ise sıcaklığın 1015 K, mol oranlarının O₂
için  0,08,  CO₂ için 0,05, H₂O için 0,049
ve  SO₂ için 0,003 olduğu
görülmüştür. Sunulan çalışmada kapsamında,, pratik sonuçlarla oldukça uyumlu olduğu sayısal sonuçlar elde
edilmiştir. Gerçekleştirilen
matematiksel modellemede, yanma ve basınç özelliklerinin yanı sıra önemli
emisyonlar ve partikül hidrodinamik akışı da modellenmiştir. Bu durum da CPFD metoduyla
geliştirilen matematiksel modelin,akışın ve yanma prosesinin modellenmesinde çok
büyük kolaylık oluşturduğunu göstermiştir. CPFD
metoduyla doğrulanan
sayısal model kullanılarak, 0,5-100 MW_th arasında değişen farklı
kapasitede CFBB sistemlerinin tasarımları ve sınır koşullarının  optimize edilebileceği sonucuna ulaşılmıştır.

Keywords

Dolaşımlı akışkan yataklı kazan, Hesaplamalı partikül akışkanlar dinamiği, Yanma, Partikül hidrodinamik akışı, Sayısal analiz

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