مشخصات پژوهش

One of the main challenges related to the CCS (Carbon Capture and Storage) process is the large amounts of heating and cooling demands in different sections of the process. In the present study, to support both of these requirements simultaneously, a novel multi-stage high-temperature heat pump system is designed for the first time. The R1233zd(E), which is a low-global warming potential (GWP) refrigerant, is selected as a working fluid in the new high temperature heat pump system. The CCS Process is operated by the flue gases, with 316535 kg/h flow rate at 250°C and delivers CO2 at the rate of 48526 kg/hr. The cooling demands of the CCS process, with the amount of 30080 kW, are given to the heat pump system as the inputs at different stages with different temperature levels and the high-temperature heat is delivered to supply the reboiler needs. The exergoeconomic evaluation is carried out in the present study. The comparison of the results of the new heat pump system with those of the conventional procedures (powerhouse steam extraction for heating demands and cooling water for cooling demands) reveals that the new HTHP system consumes about 12267 kW input power and the total costs of this system reaches to the value of 1551 $/hr which means that about 10.47 % and 40.69 % reduction in the total power consumption and total costs is achieved at the base operating conditions of the new multi-stage hightemperature heat pump system. Also, the effect of several decision parameters on the performance of the heat pump is investigated, and the maximum power saving of 119.59 MJ/tonCO2 with the final product cost of 31.55 $/tonCO2 is achieved at the best conditions.