Formation of deposit and corrosion in Afyonkarahisar geothermal heating system [Afyonkarahisar jeotermal isitma sisteminde oluşan kabuklaşma ve korozyon]

Abstract

The formation of deposit and corrosion, which was formed depending on the chemical composition of the geothermal water, is one of the most serious problems at the geothermal systems. In this study, ion chromotography (IC) and ınductively coupled plasma optical emission spectroscopy (ICP_OES) analysis were carried out for water samples that are taken off Afyonkarahisar Geothermal Heating System. Analysis of the deposits formed in pipeline was carried out by using X-Ray Diffraction Technique and total hardness of water was analyzed by TS 266 method. The results of XRD analysis showed that the deposit of CaCO formed in the suburban geothermal pipelines while the deposit of containing Na Ca(OH) , CaCO and MgAlSi formed in the inner city well water pipelines. Pitting and erosion corrosion occurred in the pipelines running well water decalcified with NaCl. Also same case occurred in the geothermal pipelines. The increase of amount of dissolved substance in the return water indicated that St37 steel was exposed to erosion corrosion. The increase of total hardness favored the formation of deposit