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近年来国内城市集中供热发展很快。现在我国三北地区许多城市都在编制集中供热的规划,实行热电联产、兴建大型锅炉房和利用工业废气的方式实现城市的热化。但是由于在热网工程建设中,基本上还是沿用管沟的敷设方式,存在着投资高,结构庞大,热损失严重,施工困难等弊病。特别是在繁华街道和建筑物密集的地区,敷设大型管沟就更加困难。目前国内有些城市正在研制热力管道的保温材料和管道直埋的方法,但就技术性能和经济效益来看,均未达到世界先进国家的水平。
In recent years, the domestic urban central heating has developed rapidly. At present, many cities in the three north regions of China are preparing plans for central heating, implementing cogeneration, building large boiler rooms, and using industrial exhaust gas to achieve urban heating. However, due to the laying of pipe trenches in the construction of thermal network projects, there are disadvantages such as high investment, huge structure, serious heat loss, and difficult construction. Especially in busy streets and densely populated areas, it is more difficult to lay large trenches. At present, some cities in China are developing thermal insulation materials for pipelines and methods for direct burial of pipelines. However, in terms of technical performance and economic benefits, they have not reached the level of advanced countries in the world.