Complex physical and chemical inhibition of corrosion processes and increase the efficiency of heat transfer in the aquatic environment to save energy resources of Ukraine
In order to improve the energy efficiency of heat transfer processes, the processes of scale formation and corrosion on heat transfer surfaces were investigated. An experimental setup and method of deposition of scale in operating conditions, hot water and steam boilers at a temperature of 95 ± 2 ° C, which differ from the known fact, that allow you to monitor and adjust the rate of scale formation, using a constant supply of fresh water to maintain a constant composition of the aquatic environment.
The corrosion resistance of scale in the process of its formation and influence on the process of chemical exposure antiscalant (LWCh 1.1 HEDP based on organophosphonates and polyphosphate reagent Seaquest) with different concentrations (2 to 50 mg / l), and the ultrasonic irradiation conditions cavitation were studied.
Anti-corrosion and antiscale properties in hard water were evaluated. It is found that the best characteristic has HEDP a concentration of 10 mg / l. The functional dependence of the growth of specific weight scale and corrosion rates of steel, depending on the composition of water and modes of ultrasonic irradiation. The morphology and structure of crustose layers formed under different conditions and power of ultrasonic irradiation by scanning electron microscopy were investigated. It has been shown that the combined effect of ultrasound and antiscalant action will optimize the process of formation and maintenance phase microlayer with anticorrosion properties which practically does not reduce the heat transfer between the metal surface and the coolant.
The technological recommendations for the use of the combined protection of mild steel in heating systems were developed. The practical significance of the results is forecasting anticorrosive and antiscale action of reagents in the heating system at the boiler of small power plants that operate without water treatment during the heating season.