求翻译：本文在对国内外供暖系统总结和分析的基础上，结合供暖系统的结构，特点以及B县供暖系统现状及不足，设计了B县城区供暖系统的改造方案，即：供热由盛和、香驰两个热电厂通过建设热源及汽轮机改造，建设循环水首站，用热水管网替代蒸汽管网，利用热电厂低温循环水，分南北两条线路同时向城区供热，实现24小时恒温供热。然后对B县城区供热系统进行投资估算，并对集中供热汽水换热站供热工程经济效益进行分析，最后得出集中供热系统改造势在必行的结论。是什么意思？

Summary and analysis of the heating system at home and abroad on the basis of the structure combined with the heating system, the status quo of the characteristics and b County heating system and inadequate design of the b county district heating system rehabilitation programs, namely: heating by th

This article in the international and domestic heating system summary and analysis on the basis of the heating system, in conjunction with the structure, characteristics, as well as county B status quo and inadequate heating system design a B County, district heating systems, and that is the transfo