A new fluidization–suspension combustion technology for coal water slurry

Slagging is a major operating problem in application of the atomization–suspension combustion technology for burning coal water slurry (CWS) fuel in small and low height industrial boilers. The fluidization–suspension combustion is a new alternative for replacement of oil, which is capable of solving the slagging problems. In addition, it can be successfully applied to CWS-fired boilers with capacity smaller than 35 t/h. About 530,000 medium and small scale industrial boilers with low boiler efficiency in China provide the technology a very promising prospect. The principles and contents of CWS fluidization–suspension combustion technology are introduced in detail in this paper. And a new type of 14 MW fluidization–suspension CWS-fired boiler was developed, the performance of which showed that boiler efficiency was 91.53%. Emission of SO2 and NOx was 346.1 mg/m3 and 469.5 mg/m3, respectively. From the application, the CWS-fired boiler showed good features such as high efficiency, low pollutant emission, good load regulation, good CWS quality adaptability, steady operation and convenient maintenance.