Low-temperature waste heat recovery device
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Why is the acid concentration in low-temperature waste heat recovery devices controlled to over 99%?
In low-temperature waste heat recovery systems, the acid concentration generally needs to be maintained at over 99%, primarily to ensure the efficiency and safety of the equipment. Firstly, a higher acid concentration can effectively improve the utilization of residual heat, thereby increasing the efficiency of the equipment ； Secondly, high acid concentrations also help ensure the stable operation of the equipment and reduce the risk of failures ； Finally, high acid concentrations can also effectively prevent corrosion and alkali buildup, thereby extending the service life of the equipment. Therefore, the acid concentration in low-temperature waste heat recovery devices is usually kept above 99%. However, the specific details also need to be determined based on the operating environment and usage conditions of the equipment. .
Is it mainly for corrosion prevention? Dilute sulfuric acid is highly corrosive, its corrosiveness being hundreds of times greater than that of concentrated sulfuric acid; therefore, only concentrated sulfuric acid can be used.
The stainless steel material used in heat recovery devices has a very narrow operating range in terms of acid concentration at high temperatures around 200 degrees; the concentration must be above 99.0% otherwise the material will corrode rapidly
Energy is not the main factor; what matters is the effect of acid temperature and absorption concentration on the corrosion rate of the material. This data was obtained through experiments. It has nothing to do with energy.
The corrosion curve of stainless steel determines the process conditions; concentrated sulfuric acid must be operated at a temperature of 180–210°C and with a concentration of 99.0–99.3% in order to function stably over the long term.