CN102168905B - Feed gas processing device for natural gas - Google Patents

Feed gas processing device for natural gas Download PDF

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Publication number
CN102168905B
CN102168905B CN201110093816.XA CN201110093816A CN102168905B CN 102168905 B CN102168905 B CN 102168905B CN 201110093816 A CN201110093816 A CN 201110093816A CN 102168905 B CN102168905 B CN 102168905B
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China
Prior art keywords
gas
processing device
compression set
cng
tower
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CN201110093816.XA
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CN102168905A (en
Inventor
贺江林
林清安
杨化淳
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BEIJING NATIONAL PETROLEUM UNITY TECHNOLOGY DEVELOPMENT Co Ltd
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BEIJING NATIONAL PETROLEUM UNITY TECHNOLOGY DEVELOPMENT Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
    • F25J3/0209—Natural gas or substitute natural gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0233—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 1 carbon atom or more
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0242—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 3 carbon atoms or more
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/02—Processes or apparatus using separation by rectification in a single pressure main column system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/72—Refluxing the column with at least a part of the totally condensed overhead gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
    • F25J2205/04—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum in the feed line, i.e. upstream of the fractionation step
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/04—Mixing or blending of fluids with the feed stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
    • F25J2220/66—Separating acid gases, e.g. CO2, SO2, H2S or RSH
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
    • F25J2220/68—Separating water or hydrates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/04—Compressor cooling arrangement, e.g. inter- or after-stage cooling or condensate removal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/30—Compression of the feed stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/02—Recycle of a stream in general, e.g. a by-pass stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/02—Internal refrigeration with liquid vaporising loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration

Abstract

The invention provides a feed gas processing device for natural gases, which comprises a feed gas preseparator, a compressor, a refrigerating separator and a fractionating device which are connected in sequence. The feed gas processing device also comprises a CNG (compressed natural gas) compressor; the refrigerating separator and the fractionating device are respectively provided with a dry gas exhausting pipe; and the CNG (compressed natural gas) compressor is connected with the dry gas exhausting pipe of the refrigerating separator and the dry gas exhausting pipe of the fractionating device. The feed gas processing device is particularly suitable for processing the natural gas incapable of being fed into a gathering pipe network of far oil-gas fields or sporadic oil-gas wells, can greatly reduce investment, and can simultaneously reduce the operating energy consumption during the production process. The liquefied gas and stabilized light dydrocarbon produced by the feed gas processing device can be used as chemical raw materials and industrial or civil fuels; the compressed natural gas can be conveyed to cities and used as fuel for natural gas automobiles to replace gasoline and diesel used by urban automobiles; and the feed gas processing device greatly cleans urban environment, and has excellent economic benefits and social benefits.

Description

A kind of feed gas processing device for natural gas
Technical field
The present invention relates to a kind of feed gas processing device for natural gas, described natural gas _ raw material gas can be associated gas, stabilization of crude oil gas, natural gas pool unstripped gas etc.
Background technology
Natural gas _ raw material gas particularly contains a large amount of C in associated gas 3h 8and above valuable lighter hydrocarbons resource, generally this part resource has all obtained recycle, through reclaiming the dry gas of lighter hydrocarbons, enters collection transmission pipe network, and resource is fully utilized.
For the fragmentary Oil/gas Well of oil gas field and the petroleum resources of outlying oil gas field, because tolerance is less, and scattered distribution, mostly well do not utilized, sometimes have to adopt into torch and burn, avoid direct emptying to bring the discharge of greenhouse gases.The present invention is especially applicable to processing this part natural gas, realizes making full use of of resource.
In associated gas, generally contain saturation moisture, H 2s, CO 2deng impurity, when reclaiming lighter hydrocarbons, need carry out pretreatment to natural gas, remove the impurity wherein containing, meet the needs of safety in production and product standard, for commercial natural gas, produce and also need the impurity in gas to remove simultaneously.
Can process processing to associated gas and obtain LPG and NGL, or obtain CNG.Term implication is as follows: LPG:Liquefied Petroleum Gas, that is, and liquefied petroleum gas; NGL:Natural Gas Liquids, that is, and natural gas liquids; CNG:Compressed Natural Gas, that is, and compressed natural gas.The LPG reclaiming for associated gas due to impure less, calorific value is high, is industry and the domestic fuel of high-quality, also can be used as valuable chemical industry materials; NGL is the industrial chemicals of high-quality, after processing, can be used as gasoline concoction component; CNG product Main Components is C 1h 4, C 2h 6component, is clean domestic fuel, particularly as city vehicle fuel, contains hardly SO in its emission x, NO xdeng pernicious gas, greatly improved city atmospheric environment, there is good environmental benefit and social benefit.Separately with CNG, make vehicle fuel and compare with gasoline, its use cost also reduces by 50% left and right, for the producer and ultimate consumer, all has good economic benefit.
At present, adopt respectively LPG retracting device and CNG device to process associated gas.The former,, for passing through successively pretreatment, compression, refrigeration and fractionation, obtains LPG and NGL; The latter, for through pretreatment, removes impurity, then through overcompression, obtains CNG.LPG retracting device and CNG device separate setup and use, do not obtain well integrating and utilizing, and make plant area more, and cost is higher.
Summary of the invention
The feed gas processing device for natural gas that the object of this invention is to provide a kind of combined recovery LPG and CNG.
Feed gas processing device for natural gas provided by the invention, comprise the unstripped gas preseparator, compression set, refrigeration separator and the fractionating device that connect successively, also comprise CNG compression set, described refrigeration separator and described fractionating device are all provided with dry gas escape pipe, and described CNG compression set connects the dry gas escape pipe of described refrigeration separator and the dry gas escape pipe of described fractionating device.
Preferably, described refrigeration separator comprises refrigerating plant and the cold catch pot being connected, and the dry gas escape pipe of described fractionating device connects described CNG compression set through described refrigerating plant.
More preferably, described refrigerating plant is divided into a plurality of refrigeration units, the described CNG compression set of part or all of connection described a plurality of refrigeration unit is drawn and passed through to the dry gas escape pipe of described refrigerating plant from described cold catch pot, and the dry gas escape pipe of described fractionating device is through the described CNG compression set of part or all of connection in described a plurality of refrigeration units.
Described a plurality of refrigeration unit is for example shallow ice chest, evaporimeter (being for example ammonia evaporator) and the main ice chest connecting successively, the dry gas escape pipe of described refrigerating plant is connected described CNG compression set through described main ice chest with described shallow ice chest, and the dry gas escape pipe of described fractionating device connects described CNG compression set through described shallow ice chest.
Preferably, described fractionating device comprises dethanizer and the debutanizing tower being connected, and the dry gas escape pipe of described fractionating device is drawn from described dethanizer.
More preferably, at the bottom of the tower of described dethanizer, be provided with deethanization bottom reboiler; The tower top of described debutanizing tower is connected with overhead reflux pipeline, on described overhead reflux pipeline, be disposed with debutanization tower top condenser, debutanization tower top return tank, debutanization tower top reflux pump and LPG carrier pipe, at the bottom of the tower of described debutanizing tower, be provided with debutanization bottom reboiler, at the bottom of the tower of described debutanizing tower, be connected with NGL carrier pipe, on described NGL carrier pipe, be provided with light oil cooler.
Preferably, described compression set is provided with Tube For Compressor Intercooler, compressor one-level exhaust tank, unstripped gas drying device, unstripped gas filter, compressor aftercooler and the compressor secondary exhaust tank connecting successively.
More preferably, the unstripped gas drier that described unstripped gas drying device is a plurality of parallel connections.
Preferably, described feed gas processing device for natural gas is removable skid-mounted.
The present invention has carried out integrating layout by LPG and CNG retracting device, reduced and repeated to arrange, improved the comprehensive utilization ratio of equipment, reduced cost, natural gas _ raw material gas is after the present invention processes, obtain LPG, NGL and CNG product, by Automobile Transportation mode, can be transported and dispatch from the factory easily, resource be fully used.The oil gas that the present invention is particularly conducive to oil gas field block newly developed, outlying block and fragmentary Oil/gas Well makes full use of.Specifically, the present invention has the following advantages:
1, oil-gas resource be can rationally utilize, liquefied gas (LPG), stable light hydrocarbon (NGL) and compressed natural gas (CNG) product produced.
2, be particularly useful for outlying oil gas field, for the precious resources in can not inlet pipe net natural gas, recycle, there is good economic benefit and social benefit.
3, opereating specification is wide, operating flexibility is large, and the scale of seriation device is 0.15 * 10 4m 3/ d～10 * 10 4m 3/ d, operating flexibility 60～110%.
4, adopt skid-mounted to arrange, can integral moving, when the resource exhaustion of somewhere, to move easily to another area and use, the utilization rate of device is high.
5, can reduce plant investment, reduce operation energy consumption.
6, adopt skid-mounted to arrange, equipment and pipeline characteristics of compact layout, can save occupation of land, reduce investment.
7, the layout that is prefabricated in the factory, reduces field engineering amount, reduces the whole duration of engineering.
8, can reduce operation staffing, reduce cost of labor.
9, preprocessing part comprises gas dehydration, acid gas removal body etc.; Refrigeration adopts outer cold technique.Produce LPG, NGL and CNG product.This device adopts outer cold technique, and light hydrocarbon yield is high.
10, can adopt the scheme automatically combining with manual control, to guarantee the technological requirement of different occasions.
Accompanying drawing explanation
Fig. 1 is the structural representation of feed gas processing device for natural gas of the present invention.
In figure: 001-LPG carrier pipe, 002-NGL carrier pipe, 101-unstripped gas preseparator, 102 compressor one-level exhaust tanks, 103-compressor secondary exhaust tank, 104-unstripped gas drier, 105-cold catch pot, 106-debutanization tower top return tank, 201-Tube For Compressor Intercooler, 202-compressor aftercooler, the shallow ice chest of 203-, 204-evaporimeter, the main ice chest of 205-, 206-deethanization bottom reboiler, 207-debutanization bottom reboiler, 208-debutanization tower top condenser, 209-light oil cooler, 301-unstripped gas filter, 401-dethanizer, 402-debutanizing tower, 501-debutanization tower top reflux pump, 601-CNG compression set.
The specific embodiment
In general, feed gas processing device for natural gas of the present invention is partly comprised of pretreatment of raw material, compression, refrigeration, product fractionation and dry gas compression etc., general installation composition part is different according to scale and raw material composition, and preprocessing part comprises natural qi exhaustion H 2s (optional), de-CO 2(optional), dehydrate (essential); Refrigeration adopts the outer cold technique of ammonia refrigeration or propane refrigeration; Product fractionation adopts the fractionation process of deethanization+debutanization.
Below by the specific embodiment, also by reference to the accompanying drawings the present invention is further described.
As shown in Figure 1, feed gas processing device for natural gas, comprise the unstripped gas preseparator 101 connecting successively, compression set (is provided with the Tube For Compressor Intercooler 201 connecting successively, compressor one-level exhaust tank 102, the unstripped gas drying device being formed in parallel by three unstripped gas driers 104, unstripped gas filter 301, compressor aftercooler 202 and compressor secondary exhaust tank 103), refrigeration separator (comprises by shallow ice chest 203, refrigerating plant and cold catch pot 105 that evaporimeter 204 and main ice chest 205 form) and fractionating device (dethanizer 401 and debutanizing tower 402), also comprise CNG compression set 601, the top of described cold catch pot 105 and described dethanizer 401 is all provided with the dry gas escape pipe that is connected described CNG compression set 601.The dry gas escape pipe on described cold catch pot 105 tops is connected described CNG compression set 601 through described main ice chest 205 with described shallow ice chest 203, and the dry gas escape pipe on the top of described dethanizer 401 connects described CNG compression set 601 through described shallow ice chest 203.At the bottom of the tower of described dethanizer 401, be provided with deethanization bottom reboiler 206; The tower top of described debutanizing tower 402 is connected with overhead reflux pipeline, on described overhead reflux pipeline, be disposed with debutanization tower top condenser 208, debutanization tower top return tank 106, debutanization tower top reflux pump 501 and LPG carrier pipe 001, at the bottom of the tower of described debutanizing tower 402, be provided with debutanization bottom reboiler 207, at the bottom of the tower of described debutanizing tower 402, be connected with NGL carrier pipe 002, on described NGL carrier pipe 002, be provided with light oil cooler 209.
Feed gas processing device for natural gas is preferably removable skid-mounted setting.Scale can be 0.15 * 10 4m 3/ d～10 * 10 4m 3/ d.Typical case's scale is for example 0.15 * 10 4m 3/ d, 0.3 * 10 4m 3/ d, 0.5 * 10 4m 3/ d, 1.0 * 10 4m 3/ d, 2.0 * 10 4m 3/ d, 5.0 * 10 4m 3/ d, 10.0 * 10 4m 3/ d.
Described feed gas processing device for natural gas can be processed processing to associated gas, stabilization of crude oil gas and natural gas pool unstripped gas etc., below process technology scheme is briefly described.
Unstripped gas is through unstripped gas preseparator 101, separate after a small amount of light oil of wherein carrying secretly, water (free water), mechanical admixture, gas enters feed gas compressor first-stage cylinder and carries out one-level compression, it is concentrated outer defeated that sewage drains into common sewer, and light oil is pumped in stable light hydrocarbon product storage tank by light oil as stable light hydrocarbon product.Unstripped gas, after one-level compression, enters Tube For Compressor Intercooler 201 and is cooled to 40 ℃, then enters compressor one-level exhaust tank 102 and carry out gas-liquid separation, and gas is through de-H 2s, CO 2, then enter the unstripped gas drier 104 that is provided with molecular sieve and dewater.Dried natural gas via unstripped gas filter 301 filters out and enters compressor secondary cylinder after molecular sieve dust and be compressed to 1.9MPa, then through compressor secondary exhaust tank 103, be cooled to 40 ℃, enter shallow ice chest 203, evaporimeter 204 and main ice chest 205 through a series of heat exchange and outer cold after refrigeration to-30 ℃, unstripped gas enters cold catch pot 105 and carries out gas-liquid separation.Dry gas enters CNG compression set 601 through main ice chest 205 and shallow ice chest 203, liquid hydrocarbon enters dethanizer 401, debutanizing tower 402 is separated into LPG and NGL, enter respectively LPG carrier pipe 001 and NGL carrier pipe 002, dethanizer 401 constant-pressures are controlled at 1.3MPa, 50 ℃ of tower top temperature-32 ℃, column bottom temperatures; Debutanization pressure 1.15MPa, 130 ℃ of tower top temperature-56 ℃, column bottom temperatures.The dry gas that dethanizer 401 tower tops are discharged enters CNG compression set 601 through shallow ice chest 203.
For cold being provided to unstripped gas system, this device has designed cooling cycle system, usings ammonia or propane as refrigeration working medium.Product fractionation institute calorific requirement is provided by heat-conducting oil system.The dry gas of device, except the personal fuel of this device, is transported to CNG compression set 601, is compressed to 25.0MPa, as the export trade of CNG product loading.
Described feed gas processing device for natural gas can adopt the scheme automatically combining with manual control flexibly, to guarantee the technological requirement of different occasions.
A concrete application examples below by the described feed gas processing device for natural gas arranging in a manner described, illustrates its effect.The specification of the feed gas processing device for natural gas in this application examples is 1.0 * 10 4m 3/ d.Unstripped gas is the associated gas in certain oil field, forms in Table 1.
Table 1 unstripped gas forms
Form N 2 CO 2 CH 4 C 2H 6 C 3H 8 C 4H 10 C 4H 10 C 5H 12 C 5H 12 C 6H 14 +
Content (v%) 0.33 0.86 57.51 6.30 18.69 2.91 6.24 1.58 1.39 4.19
The material balance of this feed gas processing device for natural gas is in Table 2.
Table 2 material balance
Sequence number Name of material Yield, % Numerical value, t/a Remarks
One The side of entering
Associated gas 100.00 4597 10000m 3/d
Two The side of going out
1 LPG 39.15 1800
2 NGL 18.03 828
3 CNG 40.88 1872 5971m 3/d
4 Fuel 1.96 90
LPG meets < < oil gas field liquefied petroleum gas > > (GB9052.1-1998) standard-required;
NGL meets < < stable light hydrocarbon > > (GB9053-1998) I light hydrocarbon product standard-required;
CNG meets < < compressed natural gas used as vehicle fuel > > GB18047 standard-required.
Compare with natural gas compressing two covering devices with the lighter hydrocarbons recovery with scale conventional in prior art, the feed gas processing device for natural gas floor space of above application examples reduces, construction investment reduces and operation staffing all reduces, running cost reduces, economic benefit improves, and the investment payback time reduces greatly.

Claims (3)

1. a feed gas processing device for natural gas, comprise the unstripped gas preseparator, compression set, refrigeration separator and the fractionating device that connect successively, it is characterized in that, also comprise CNG compression set, described refrigeration separator and described fractionating device are all provided with dry gas escape pipe, described CNG compression set connects the dry gas escape pipe of described refrigeration separator and the dry gas escape pipe of described fractionating device
Described refrigeration separator comprises refrigerating plant and the cold catch pot being connected, and the dry gas escape pipe of described fractionating device connects described CNG compression set through described refrigerating plant,
Described refrigerating plant is divided into a plurality of refrigeration units, the part that the dry gas escape pipe of described refrigerating plant is drawn and passed through described a plurality of refrigeration unit from described cold catch pot connects described CNG compression set, the dry gas escape pipe of described fractionating device connects described CNG compression set through the part in described a plurality of refrigeration units
Described a plurality of refrigeration unit is shallow ice chest, evaporimeter and the main ice chest connecting successively, the dry gas escape pipe of described refrigerating plant is connected described CNG compression set through described main ice chest with described shallow ice chest, the dry gas escape pipe of described fractionating device connects described CNG compression set through described shallow ice chest
Described fractionating device comprises dethanizer and the debutanizing tower being connected, and the dry gas escape pipe of described fractionating device is drawn from described dethanizer,
At the bottom of the tower of described dethanizer, be provided with deethanization bottom reboiler; The tower top of described debutanizing tower is connected with overhead reflux pipeline, on described overhead reflux pipeline, be disposed with debutanization tower top condenser, debutanization tower top return tank, debutanization tower top reflux pump and LPG carrier pipe, at the bottom of the tower of described debutanizing tower, be provided with debutanization bottom reboiler, at the bottom of the tower of described debutanizing tower, be connected with NGL carrier pipe, on described NGL carrier pipe, be provided with light oil cooler
Described compression set is provided with Tube For Compressor Intercooler, compressor one-level exhaust tank, unstripped gas drying device, unstripped gas filter, compressor aftercooler and the compressor secondary exhaust tank connecting successively.
2. feed gas processing device for natural gas according to claim 1, is characterized in that, the unstripped gas drier that described unstripped gas drying device is a plurality of parallel connections.
3. feed gas processing device for natural gas according to claim 1, is characterized in that, described feed gas processing device for natural gas is removable skid-mounted.
CN201110093816.XA 2011-04-14 2011-04-14 Feed gas processing device for natural gas Expired - Fee Related CN102168905B (en)

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CN103822438B (en) * 2012-11-16 2016-08-03 中国石油天然气股份有限公司 A kind of shallow cold process for recovering light hydrocarbon method
CN103160353B (en) * 2013-03-29 2014-05-07 四川金科深冷设备工程有限公司 Miniature skid-mounted natural gas recovery system
CN104279838A (en) * 2013-07-09 2015-01-14 王建基 Oilfield associated gas stable mixed hydrocarbon recycling and natural gas liquefaction combined technology
CN104845692A (en) * 2015-04-03 2015-08-19 浙江大学 Oilfield associated gas complete liquefaction recovery system and method thereof
CN105716371B (en) * 2016-04-12 2017-11-10 成都赛普瑞兴科技有限公司 A kind of method and device of azeotrope refrigeration natural gas lighter hydrocarbons recovery
CN112852485A (en) * 2020-12-31 2021-05-28 四川科比科油气工程有限公司 Control method and system for mixed hydrocarbon recovery

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