There are many ways to classify economizers, which can be classified in the following ways:
1. According to the degree of heating of the feed water: it can be divided into non-boiling type and boiling type Two kinds.
2. According to the manufacturing materials: there are two types of economizers: cast iron and steel pipe. Non-boiling economizers are mostly made of cast iron, but they are also made of steel pipes, while boiling economizers can only be made of steel pipes. Cast iron economizers are mostly used in boilers with pressures ≤2.5MPa. If the pressure exceeds 2.5MPa, an economizer made of steel pipes should be used.
3. According to the form of the device: there are two types: vertical and horizontal.
4. According to the relative flow direction of smoke exhaust and water supply: there are three types: downstream type, counterflow type and mixed type.
5. According to the structural form: plain tube economizer and fin economizer. Fin-type economizers include: H-type economizer (more commonly used) and spiral fin economizer.
6. According to the form of heat conduction: direct conduction and indirect conduction;
Direct conduction uses the boiler exhaust gas to directly radiate to preheat the boiler water; indirect conduction uses the heat transfer medium to indirectly preheat the boiler. Water; indirect conduction technology has developed rapidly in China since the 1990s and has made great technological breakthroughs, mainly including thermal oil technology patents and superconducting thermal energy-saving technology patents. In particular, the aerospace superconducting thermal material technology that began in the early 21st century has been at the forefront of the world's boiler energy-saving field!