Technical and Economic Feasibility Study of Constructing a Mini LNG Unit to Supply Gas for Major Consumers in Khorasan Razavi Province During Peak Times

In the present study, brief review of the introduction of LNG, processes and equipment for its production and conversion to gas were done. Then mini LNG units were introduced and its maximum capacity (300 tons/day) was selected as the base unit. In the economic section, based on the selected scale and selection of the liquefaction process by the nitrogen expansion cycle method, price of the equipment was estimated and then updated according to the cost index for 2019. After that, the fixed and operating investment costs and finally total investment were estimated. According to assessments, the investment cost of the mini LNG unit with a capacity of 300 tons/day and a volume of 20,000 m3 of tanks is estimated at 101 MMUSD. Based on the calculations and according to the capacity of the proposed storage tanks and the consumption of a power plant, this mini LNG unit can supply gas for power plant for 60 hours of operation at its maximum power generation capacity. With the assumptions used for the price of electricity generated at peak times, the rate of return on investment was calculated and finally, based on the technical and economic evaluation, the feasibility of implementing this project was investigated.