论文部分内容阅读
一、引言由于热水网供热,比之蒸汽网在技术、经济、供热质量、使用管理等各方面有着一系列显著的优点,目前已被世界各国所公认,成为发展趋势。以苏联莫斯科为例,其城市热网总长3000公里,其中蒸汽网为75公里,只占2.5%。在国外对热煤选择也有过争论。通过多年实践和探讨,目前集中供热发展,新建热网一般都是热水网,甚至有的将旧汽网改为热水网的。有的国家明确规定在一定热量以上必须集中供热,并在一定条件下规定使用热水等等。
I. INTRODUCTION Due to the heating of the hot water network, it has a series of significant advantages over the steam network in terms of technology, economy, quality of heat supply, use management, etc. It has now been recognized by all countries in the world and has become a development trend. Take the Soviet Union in Moscow for example, the total length of its urban heating network is 3,000 kilometers, of which the steam network is 75 kilometers, accounting for only 2.5%. There has also been debate over the choice of hot coal in foreign countries. Through years of practice and discussion, the current development of centralized heating, the new heating network is generally hot water network, and some even change the old steam network to hot water network. Some countries clearly stipulate that heat must be concentrated above a certain amount of heat, and use of hot water must be stipulated under certain conditions.