Criteria for Selecting the Optimum Substance for Use in a Low-temperature Power Plant Using Low-potential Heat From LNG

This article discusses the processes of regasification of liquefied natural gas (hereinafter referred to as LNG), combining this process with common power generation schemes with typical cycles (such as Rankine and Brayton cycles). The possibility of using low-potential energy in typical cycles during the regasification process is considered. The possibility of using complicated design schemes of power plants with the use of auxiliary cycles and the use of utilization of exhaust gases and the use of low-potential heat of a cryoproduct is considered. The main and common working substances in auxiliary cycles (mainly working according to the Rankine cycle) are considered. Evaluation of the efficiency of using these substances at about critical values under the condition of equal temperature at the point in front of the turbine in order to obtain the maximum possible work for each substance. The values of efficiency and generated power were estimated at equal consumption of the working substance. The effectiveness of these substances was also compared with LNG and carbon dioxide.