1.5 Gravimetrical measurements of deposited particles
To collect deposits in the flue gas heat exchanger of the boiler, four stainless steel rings (material number: 1.4432) made of X2CrNiMo17-12-3 were used. Two of the rings were placed in the beginning of the flue gas heat exchanger tubes (position A in Figure 2) and two of them in the middle of the flue gas heat exchanger (position B in Figure 2).