16. Experimental Study on the Influence of Slagging and Fouling for Wall Temperature Distribution

Coal is still the main fossil fuel for power plants in China, and heat resistance ratio of the fly ash slag and fouling layer is the key weight ratio for super-heaters and re-heaters with coal fired boiler. Actually the slagging and fouling layers happened on the fireside surface of tubes are not uniform in the circumferential direction. To explore the influence level of the smoke flow on the slagging and fouling distribution, a tower type furnace facility was established, and the influence of slagging and fouling of a horizontal tube for the wall temperature distribution was studied. Meanwhile, the heat transfer model of clean tube and stained tube was established. A comparative study of clean tube surface and stained tube surface temperature distribution was conducted. The results showed that the wall temperature distribution with slagging and fouling was totally different with the clean condition. And the heat flux distribution of the clean tube was a single-humped curve, but the stained tube showed the double humped curve in the circumferential direction.