Abstract
The production, transportation, and storage of liquefied natural gas (LNG) is a promising area in the gas industry due to a number of the fuel’s advantages, such as its high energy intensity indicators, its reduced storage volume compared to natural gas in the gas-air state, and it ecological efficiency. However, LNG storage systems feature a number of disadvantages, among which is the boil-off gas (BOG) recovery from an LNG tank by flaring it or discharging it to the atmosphere. Previous attempts to boil-off gas recovery using compressors, in turn, feature such disadvantages as large capital investments and operating costs, as well as low reliability rates. The authors of this article suggest a technical solution to this problem that consists in using a gas ejector for boil-off gas recovery. Natural gas from a high-pressure gas pipeline is proposed as a working fluid entraining the boil-off gas. The implementation of this method was carried out according to the developed algorithm. The proposed technical solution reduced capital costs (by approximately 170 times), metal consumption (by approximately 100 times), and power consumption (by approximately 55 kW), and improved the reliability of the system compared to a compressor unit. The sample calculation of a gas ejector for the boil-off gas recovery from an LNG tank with a capacity of 300 m3 shows that the ejector makes it possible to increase the boil-off gas pressure in the system by up to 1.13 MPa, which makes it possible to not use the first-stage compressor unit for the compression of excess vapours.
Highlights
Publisher’s Note: MDPI stays neutralThe growth vector of the world energy market is changing rapidly; this is primarily linked to the search for and development of new methods of production, transportation, and storage of energy resources [1,2]
Due to its high density, liquefied natural gas can be stored in tanks and makes it possible to accumulate large fuel reserves
Having passed the gas ejector, the mixture of the boil-off gas and natural gas carried by the working medium of gas ejector 10 to the mixing chamber by means of the flows into tank 13, where, via discharge line 14, and when gate valve 15 is open, it is used low-pressure zone created it. farm 5 prevents the compressor flow with higher pressure for the process needs of the in tank or fed to the second stage for further from enteringthus, into the the ejector tank
Summary
The growth vector of the world energy market is changing rapidly; this is primarily linked to the search for and development of new methods of production, transportation, and storage of energy resources [1,2]. Pnevmomash, OOO produces and supplies equipment for compressing natural gas, including for preventing methane vapor emissions and their re-liquefaction [24] To implement this technology, the company offers a reciprocating compressor MIKUNI DN6-25BG2 for boiloff gas compression with a capacity from 0.1 m3 /min to 19 m3 /min; discharge pressure. Regardless of the manufacturer, the reciprocating compressor is a machine for compressing and supplying gas under pressure, which is carried out by means of a reciprocating movement of the piston in the cylinder This machine requires additional energy costs to ensure the operation of the electric motor, capital investments, and operating costs. The purpose of this work is to justify the possibility of boil-off gas recovery in LNG storage using a gas ejector, where high-pressure natural gas from the supply pipeline serves as a working fluid. From the LNG tank, no for the calculation methods of its operating characteristics and physical dimensions for this case, was found in the body of relevant research
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