三维内肋管管式空气预热器的设计与可行性研究

采用强化传热性能优良的新型三维内肋管与传统热能力强、漏风系数小的热管双级布置的方案对300MW电站锅炉机组空气预热器进行了优化设计和可行性研究。空气预热器总的漏风系数设计值为5％，加热一、二次风的上级三维内肋管卧式空气预热器的布置空间分别为螺纹管空气预热器的64．46％和47．87％，相应的受热面积为42．61％和37．32％，这有效地解决了回转式空气预热器漏系大，以及一航管式空气预热器体积庞大、难以布置的问题。

Design and Feasibility Study of a Tubular Air Preheater Composed of Three-dimensional Internally Ribbed Tubes

An optimized design and feasibility study was conducted of an air preheater for a 300 MW utility boiler. The air preheater incorporates a new type of three dimensional internally ribbed tubes with an intensified heat transfer capability. The heating tubes laid out in two stages feature a high heat transfer performance and low air leakage rate. The design air leakage factor of the air preheater is set at 5%. In terms of lay out space the three dimensional internally ribbed tubes of the horizontal air preheater for heating the primary air and secondary one constitute respectively 64.46% and 47.85% of a spiral tube air preheater with a corresponding heating surface area equivalent respectively to 42.61% and 37.32% of the spiral tube preheater. Such a scheme effectively solves the problem of an excessively large air leakage factor inherent to a rotary air preheater and the problem of an inordinately large physical volume as well as lay out difficulties usually associated with the use of a conventional tubular air preheater.