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US 3,942,589 AGranted
Shell and tube heat exchanger
AssigneeDeutsche Babcock & Wilcox Aktiengesellschaft
InventorRudolf Opitzer
Life of this patent
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AssigneeDeutsche Babcock & Wilcox Aktiengesellschaft
InventorRudolf Opitzer
Estimating the term…
An improved shell and tube heat exchanger is described wherein power steam for driving a turbine is reheated between successive stages of the turbine. The power steam passing through the shell is heated by heating steam passing through heating tubes, the exchanger being of the type having steam distribution elements including a main inlet header adapted to distribute heating steam to the heating tubes, a main outlet header located to collect the heating steam from the heating tubes, a plurality of pairs of inlet and outlet subheaders, feeder tubes for coupling each of the inlet and outlet subheaders to the main inlet header and main outlet header respectively, and heating tubes coupling the inlet and outlet subheaders of each pair. The heat exchanger is characterized by an improved arrangement of the distribution elements to provide improved allocation of the heating steam to uniformly heat power steam of varying moisture distribution and hence different local heat transfer requirements, without developing degenerative heat transfer conditions. In the improved arrangement of distribution elements, each pair of inlet and outlet subheaders has a uniform number of heating tubes in relation to the quantity of heating steam applied by the feeding tubes coupled to that pair, to provide a uniform quantity of heating steam for each heating tube, whereby power steam of varying moisture distribution is heated with steam pressure loads remaining substantially independent of heat transfer variations in the individual heating tubes.
A shell and tube heat exchanger arranged to uniformly heat power steam of varying moisture distribution and hence different local heat transfer requirements, without degenerative heat transfer conditions arising as the power steam passing through the shell is heated by heating steam passing through heating tubes, the exchanger being of the type having steam distribution elements including a main inlet header adapted to distribute heating steam to the heating tubes, a main outlet header located to collect the heating steam from the heating tubes, a plurality of pairs of inlet and outlet subheaders, feeder tubes for coupling each of the inlet and outlet subheaders to the main inlet header and main outlet header respectively, and heating tubes coupling the inlet and outlet subheaders of each pair, said heat exchanger being characterized by an improved arrangement of the distribution elements to provide improved allocation of the heating steam in which:
A shell and tube heat exchanger arranged to uniformly heat power steam of varying moisture distribution and hence different local heat transfer requirements, without degenerative conditions arising as the power steam passing through a cylindrical shell is heated by heating steam passing through heating tubes, the heat exchanger being of the type having steam distribution elements including a main inlet header adapted to distribute heating steam to the heating tubes, a main outlet header located to collect the heating steam from the heating tubes, a plurality of pairs of inlet and outlet subheaders, feeder tubes for coupling each of the inlet and outlet subheaders to the main inlet header and main outlet header respectively, and heating tubes of like length coupling the inlet and outlet subheaders of each pair, the heat exchanger being characterized by an improved arrangement of steam distribution elements, providing improved allocation of heating steam, in which:
Dependencies are inferred from the claim text.