The influence of Na2SO3/NaHSO3 on the formation process of low‐temperature ash deposition with an in situ measurement technique

Understanding the reduction mechanism of additives on ammonium bisulfate (ABS) fouling formation can alleviate ABS fouling problems. This paper presents an investigation of the influence of Na2SO3/NaHSO3 on the formation process of ABS fouling with an in situ measurement technique. According to the thickness curves, both Na2SO3 and NaHSO3 can control the growth of ABS fouling, but Na2SO3 shows a better inhibitory effect on the growth of ABS fouling. Meanwhile, the mitigation effect of the additive on ABS fouling increases with the increasing injection quantity of the additive. The results of the heat flux show that the heat transfer performance of the fouling probe becomes better with the injection of additives, whereas the heat transfer performance becomes worse with the increasing injection quantity of additives. The thermal resistance of ABS fouling provides a reasonable agreement with the results of the heat flux. The SEM‐EDX results show that the additives have an effect on the formation of ABS fouling by controlling the ABS concentration, which can increase the viscosity of the particle, promote the agglomeration of the fouling particle, and enhance the heat transfer of the ABS fouling, providing a rational explanation for the experimental results.