return flue boiler

例句：

1. 1. The flueboiler is used to remove harmful emissions from the exhaust gases.
   烟道锅炉用于去除废气中的有害物质。
2. 2. The flue boiler was designed to improve energy efficiency and reduce greenhouse gas emissions.
   烟道锅炉设计用来提高能源效率并减少温室气体排放。
3. 3.The flue boiler is a crucial component of the industrial process, as it helps to control the temperature and humidity levels in the production area.
   烟道锅炉是工业生产中的关键部件，它有助于控制生产区域的温湿度水平。