Maoqiong Gong
Chinese Academy of Sciences, Beijing , China
Title: : Development and operation practice on miniature liquefiers for scattered and isolated natural gas resources
Biography
Biography: Maoqiong Gong
Abstract
A series of moveable small scale skid-mounted liquefiers for scattered and isolated natural gas resources have been developed and tested, with liquefaction capacity of 10,000 Nm3/d, 15,000 Nm3/d, 30,000 Nm3/d, 60,000 Nm3/d and 100,000 Nm3/d. The compressor unit and cold box of liquefiers are compactly integrated in a skid. The liquefiers are based on a mixed-refrigerant liquefaction cycle with R22 pre-cooling. Most of the devices in liquefiers are easily available commercial refrigeration products. An oil-lubricated single-stage screw compressor is used for the compression of mixed-refrigerant, combined with air coolers. The core of cold box is an aluminum plate-fin heat exchanger with four flow passages. The liquefiers were tested and operated under different conditions. The minimum specific power consumption of 10,000 Nm3/d type was 0.54 kW h/Nm3, which was equivalent to 15.3% of the gas consumed with the rest liquefied. The power consumption of 30,000 Nm3/d type and 100,000 Nm3/d type were only 0.40 kW h/Nm3 (including all facilities) and 0.35 kW h/Nm3 respectively. This series of liquefiers could cover various liquefaction requirements such as small natural gas or coal-bed methane exploitations, distributed peak-shaving, and boil-off gas reliquefaction. A flexible distributed liquefaction center could be established with the combination of a set of small liquefiers.