PLANT FOR PARTIAL LIQUEFACTION OF NATURAL GAS Russian patent published in 2006 - IPC F25J1/00 

FIELD: gas-processing industry, cryogenic equipment engineering, possible use for liquefaction of natural gas.

SUBSTANCE: plant for partial liquefaction of natural gas includes serially positioned along direct flow source of high pressure gas, heat exchanger for preliminary cooling, main heat exchanger, filter-separator for hard particles, expanding device, at input connected to direct flow line, and at output connected to reverse flow line, throttling valve of production flow, and separator-accumulator of liquefied gas. Prior to input into expanding device filter and cutting valve are mounted. Expanding device is made in form of turbo gas expansion machine, wherein as break on one shaft turbo-compressor is mounted. Output from turbo gas expansion machine is connected to reverse flow after accumulator-separator for liquefied gas. Temperature indicator mounted at output from turbo gas expansion machine through control block, is interconnected to throttling valve of production flow. High pressure gas source through cleaning block, filter and cutting valve is connected to input of turbo-compressor. Output of turbo-compressor through reverse valve and cooling device is connected to input of preliminary heat exchanger. Input of preliminary heat exchanger by rounding line through bypassing valve is connected to input of turbo-compressor. Bypassing valve is interconnected through control block with turbo gas expansion machine revolution number indicator.

EFFECT: 20-25% increased liquefaction of natural gas, improved stability of plant operation, improved personnel and equipment safety.

2 cl, 2 dwg