Abstract
A comparative analysis has been performed of the suitability of using turbo-and piston (reciprocating) expanders in low-consumption units of natural gas liquefaction plants operating at an initial pressure pi = 3–5 MPa. Two versions have been investigated: 1) monoblock (single-block) expander-compressor unit (ECU) consisting of a turboexpander and a turbocompressor and 2) expander-generator unit (EGU) consisting of a piston expander and a generating engine. The merits and demerits of both versions have been indicated. It has been shown that in the liquefied natural gas (LNG) output range mLNG ≤ 1.0–1.5 ton/h use of EGU is preferable because it ensures partial recovery of power expended for compressing and movement of natural gas in trunk pipelines. Based on an analysis of domestic opposite compressors pressed into production, it has been concluded that it is possible to build efficient EGU on Y-and E-like bases for plants producing up to 5 ton/h of LNG with a power recovery of up to 1 MW.
Published Version
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