Experimental research of descaling characteristics using circumfluence dilution and uniform-temperature perturbation in a vacuum furnace

Fig. 1. Contrast of the scaling amount of each section after 8 h. Five canals were sequentially named as A, B, C, D, and E starting from the inlet section. A total of 25 comparative experiments with and without circumfluence dilution and uniform-temperature perturbation (CUP) were conducted to obtain the each section of pipe scaling mass. Because of circulation of the water with high temperature and low ion concentration from heat exchange tubes outlet, the water temperature of the inlet of the heat exchange tubes increases, the scaling reaction in the front section of the tube increases. This method mitigates the scaling degree of the rear section of the heat exchange tubes, and the scaling layer tends to be uniformly distributed along the tube. Even the deferred rate is unchanged, the descaling cycle extends, as shown in Fig. 1.97