UNUSED 415 T/d LNG plant available for sale
This plant is based on process design and equipment structure design, it considers sufficiently the plant safety, reliability and advancement, meanwhile it is easy to operate and maintain so that it operates steady in a long term.
Plant Performance Data
Plant Capacity: 415 T/d LNG
Range of Plant Capacity: The range of operation capacity is 60~100% of design capacity per hour; if under 60~80% of design capacity; the process control is not very accurate because of uneven distribution in plate-fin heat exchanger.
LNG Storage Pressure LNG: 1.12~1.18bara
LNG Storage Tem: Saturation temperature in the storage Pressure
Plant will operate at least 8000 hours/year
The feed gas from acid remove system comes into decarburization cooler (E0201) after filtering and measuring, and cooled down to ambient temperature, and then enters into decarburization separator. After removing free water, the gas goes into Dehydration tower (A0201A/B/C) via control valve FV0201
The gas comes into dehydration tower from its top; after adsorption and dehydration by the layer of molecular sieve bed, it comes out from its bottom, where the water content in dry natural gas is not higher than 1ppmV; the dry natural gas then goes into mercury-removal unit to get rid of mercury, after that, the mercury content is not higher than 0.01μg/Nm3; and then the natural gas comes into dust filters, and eventually goes into cryogenic liquefaction unit
There are 3 sets of dehydration tower, during specific adsorption intervals, the first tower adsorps for removing water, the second is in pre-adsorption which adsorps water in regeneration gas; the third is in regeneration statement which is heated and then cooled down to adsorp water in molecular sieve; after 1st tower is in saturation, it is switched to the statement of 2nd tower; the saturated tower continually is heated and cooled; these 3 tower is switched in above way.
The regeneration gas drawn before pressure control valve comes topdown through pre-adsopted tower, where gas is fully dried and comes into regeneration-gas heater (E0203) to reach 220～250°C; the heat and dry gas gets bottomup through the heating and regenerating tower to adsorp the water in molecular sieve; the wet regeneration gas goes into cooler(E0202) to the ambient temperature, and then gets into separator (S0201) to adsorb the condensate water which is drained by level control valve
The gas from top separator (S0201)and the natural gas after pressure control valve come into tower in adsorption statement; After heating, the bypass heater of regeneration gas, which is not in operates, the dry gas goes through regeneration tower in the same way, which makes tower in cooling stage
The natural gas from dehydration unit comes into cold box of cryogenic liquefaction unit for heat exchanging in liquid heat exchanger(E0401A/B/C) with reflux medium to a specific temperature, and then comes out of E0401A/B/C; after it gets into cryogenic separator (S0401), the gas goes back to E0402A/B/C to be cooled and condensed and goes out of the bottom liquid exchanger (E0401A/B/C);
After throttling, the gas comes into LNG flash drum, at the bottom of which LNG product gets from cold box and into LNG tank; the liquid heavy hydrocarbon from bottom separator（S0401） goes into exchanger (E0403) to exchange heat, and then goes into ethan tower condenser(E0501) to be cold sources to condense the gas from top deethanizer (T0501), meanwhile the former gas itself is cooled and evaporated partly; the heavy hydrocarbon from condenser of deethanizer comes into deethanizer for rectification;
There is a reboiler on bottom of deenthanizer which is for evaporating the liquid on bottom deenthanizer by conduction oil; after rectification in deenthanizer, the rich-methane-and- ethane-gas is produced on top, the rich gas is pushed into deethanizer condenser for cooling down, after that the gas liquid goes into separator on top deethanizer to separate liquid to be reflux liquid and separate gas to be exchanged heat in heavy hydrocarbon exchanger; and then it goes into liquid exchanger (E0402A/B/C) to be condensed and liquefied , eventfully throttled into LNG flash drum (S0402)
The liquid from bottom deenthanizer is throttled into debutanizer (T0502) to be distilled; there is a condenser on top debutanizer with cold resources: circulation water; there is a reboiler on bottom debutanizer with heat resources: conduction oil; after distillation, the rich -propane-and-butane gas on top debutanizer is produced, the rich gas is condensed to be liquid by condenser (E0503); some of the liquid is to be reflux liquid; other liquid is cooled to ambient temperature by LPG cooler to LPG tank (S0504); some liquid from bottom debutanizer is cooled by gasoline cooler to gasoline tank (S0503) as the product
The residual gas from LNG flash drum gets back to liquid heat exchanger for reheating to ambient temperature, and then goes out of cold box for BOG compressor, after compression, it is sent to fuel gas unit
Most refrigerant is supplied by MRC unit; the mixed refrigerant is compressed by compressor (C0601), after cooling down, it is sent to outlet separator of compressor for getting gas MRC and liquid MRC; they are separately goes into channels of liquid exchanger, the liquid MRC is cooled to -60°C, after throttling and decompressing, it returns to exchanger (E0401A/B/C); the gas MRC is cooled down in exchanger (E0401A/B/C、E0402A/B/C), after throttling and decompressing, it comes into bottom exchanger for bottom-up evaporation, and then mixed with reflux MRC liquid to go out of cold box; they returns to outlet of compressor for the next compressing and refrigeration
The quality of circulating cooling water must meet GB50050 “Code for Design of Industrial Recirculation Cooling Water Treatment”, whose basic requirements are as follows:
The supply water temperature circulation cooling water 32°CThe return water temperature circulation cooling water 40°CFeeding water pressure ≥3.5barg Return water pressure ≥2.0 barg
High voltage power supply: 11KV±5%，50HZ±0.5HZ，3-phase, 3-wire system, neutral point is non-earthed
Low voltage power supply: 380/220V, 50HZ±0.5HZ、3-phase, 4-wire, neutral point is earthed.
The quality of instrumental air meets standards of SH/T3020-2001 “Code for design of instrument gas supply for petrochemical enterprises”. Instrumental air requires as follows:
Instrument Air Pressure 5-7barg Dew point -40°C
Nitrogen pressure 6barg Purity of Nitrogen ≥99.99 % O2 content ≤100ppm CO2 content CO2 ≤30ppm Water content ≤-70℃（dew point）
For safety, 20m3 LN tank and 600Nm3/h evaporator should be equipped.
Hot Oil Heating Unit
Hot oil temperature: 260~280°C. Heating load: ~1000kW. Pressure of hot oil: ~5barg.
Feed Gas Component :
Raw Natural Gas & Feed Gas Component:
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