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The work presented here is a synergistic blend between
experimentation, numerical simulations and
industrial observations into developing a novel heat exchanger
that minimises fouling while increasing the heat
transfer and lowering the pressure drop. A number of inline
tube bundle heat exchanger geometries are experimentally
and numerically studied in order to assess their
gas-side thermal, hydraulic and fouling behaviour, while
assuming that possible variations of the shape of the
inner tube surfaces will not significantly affect the study.
Three different tube shapes (namely circular, elliptic and
drop-shaped) are considered at two transverse spacings;
one of the spacings is similar to the one employed in typical
industrial heat exchangers (e.g., at the lignite utility
boilers of the Public Power Corporation of Greece,
PPC). The design methodology followed is explained
in detail and the selection of the various tube bundle
arrangements described. The heat transfer, pressure
drop and fouling characteristics of the various tube bundle
geometries are compared by means of numerical simulations
at full-scale and at the actual operating
conditions of the lignite utility boilers of PPC. This is
followed by lab-scale experiments and simulations to
give further insight into the mechanisms responsible
for the different behaviour observed. The outcome is an arrangement implementing a novel tube shape which
performs favourably well in terms of particle deposition,
heat transfer and pressure drop. This study is part of a
long-term research programme into the effects of fouling
on heat exchangers in lignite utility boilers and into
alternative techniques for process intensification and
fouling minimisation.
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The work presented here is a synergistic blend between experimentation, numerical simulations and
industrial observations into developing a novel heat exchanger that minimises fouling while increasing the heat transfer and lowering the pressure drop.
本研究是以复配增效法,通过实验、数值模拟及工业观察,研制出一种减少结垢,同时提高传热及缓解压力下降的新型换热器。

A number of inline tube bundle heat exchanger geometries are experimentally
and numerically studied in order to assess their gas-side thermal, hydraulic and fouling behavior, while assuming that possible variations of the shape of the inner tube surfaces will not significantly affect the study.
为了评估煤气端的热力、液压及结垢行为,在假定本研究不受形状不同的内炉管表面的显著影响下,对数个内联管束换热器的几何体进行实验与数值研究。

Three different tube shapes (namely circular, elliptic and drop-shaped) are considered at two transverse spacings; one of the spacings is similar to the one employed in typical industrial heat exchangers (e.g., at the lignite utility boilers of the Public Power Corporation of Greece,PPC). The design methodology followed is explained in detail and the selection of the various tube bundle
arrangements described.
在两个横向间距中,考虑使用三种不同形状的炉管(圆形、椭圆形及滴形);其中一个类似典型工业换热器所使用的间距(例如希腊公共电力公司,PPC的电站褐煤锅炉)。本文对下列的设计方法进行详细的讲解,并阐述各种不同管束排列。

The heat transfer, pressure drop and fouling characteristics of the various tube bundle geometries are compared by means of numerical simulations at full-scale and at the actual operating conditions of the lignite utility boilers of PPC. This is followed by lab-scale experiments and simulations to give further insight into the mechanisms responsible for the different behaviour observed.
通过全面的数据模拟以及PPC的电站褐煤锅炉的实际操作条件,对各种不同管束几何体的传热、降压及结垢的特性进行比较;接着再进行实验室实验与模拟,以便进一步洞察造成不同行为的机制。

The outcome is an arrangement implementing a novel tube shape which performs favourably well in terms of particle deposition, heat transfer and pressure drop. This study is part of a long-term research programme into the effects of fouling on heat exchangers in lignite utility boilers and into alternative techniques for process intensification and fouling minimisation.
研究的结果是执行一种新型的炉管排列,它对颗粒沉积、热力转换及压力下降等方面都表现得很有利。
本研究是一个长远调研计划的一部分,主要研究电站褐煤锅炉换热器结垢的效应,以及强化工艺及对减少结垢的各种技术的取舍。
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第1个回答  2010-02-23
这里的工作是混合相互协同效应的
实验,数值模拟并
为开发新型换热器提出工业性意见
,最大限度地减少污染,同时提高除热
和降低压降。研究管束换热器的实验图表
和数值,以评估其
气端热力,水力和污染,而研究
假设形状可能的变化
表面不会产生重大影响。
三种不同形状的管(即圆形,椭圆形,
下降型)被认为是两个横向间距;
其中的间距类似于典型采用的
工业热交换器(例如,褐煤
锅炉公共电力公司,希腊,
PPC)的。随后的设计方法解释说明了
在细节和各项管束选择
安排。传热,压力
下降,各种管束污染特性
几何结构进行对比数值模拟。
全面并实际操作
PPC褐煤电站锅炉。
其次是实验室规模的试验和模拟,
进一步了解责任机制 ,
观察不同的行为。其结果是实施一项
新的安排,管形良好反映出
颗粒沉积条件,
传热和压降。这项研究是
长期到污染的影响研究方案
的一个组成部分。
换热器在电站锅炉成对处理
褐煤并加强替代技术开发,
使污染最小化。