Natural gas pressure reduction at the Gas Distribution Station to produce gas-engine fuels
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Process Description Feedstock– high-pressure NG is fed into the dehydration unit 1 and divided into two streams. The first stream is fed to heat exchanger 6 for cooling, the second to refrigerator 2 connected to refrigerating machine 3. The cooled gas is mixed with the stream leaving heat exchanger 6, pressure is reduced by means of expander 4 and directed to the bottom of refluxer 7. Refluxing occurs due to countercurrent cooling with low-pressure gas, which is supplied from separator 8. Low pressure gas is then heated in heat exchanger 6, mixed with adsorbent regeneration gas from unit 1 and discharged from the unit. The resulting reflux gas is fed into expander 5, reduced and, together with the fractionation gases from unit 9 is fed to separator 8. NGL is discharged from the bottom of separator 8 and mixed with reflux supplied from the bottom of refluxer 7. The combined stream is fractionated in unit 9 to produce LNG and AUTOGAS, which are discharged from the unit.
Process features
Low power consumption
Deep recovery of С3+ hydrocarbons in the form of AUTOGAS
Block-modular design (with NG capacity of up to 30,000 nm³/hour
Possibility of simultaneous production of LNG and AUTOGAS
Technical Specification
Natural gas capacity: up to 100 000 nm³/hour (LNG up to 20 t/h)
Feed gas pressure 2.5–5.5 MPa
Reduced gas pressure: 0.4–0.6 MPa
LNG pressure at the outlet: 0.4–0.6 MPa
Liquefaction factor based on liquid products total – 0.15–0.27
С3+ hydrocarbons recovery at least 99%
Patents of the Russian Federation No. 2673970, 2717667, 2745176, 2745178, 2750864, 2757207, 2758962