CN103868324A - Small-sized skid-mounted mixed refrigerant natural gas liquefaction and NGL (Natural Gas Liquid) recovery integrated system - Google Patents

Small-sized skid-mounted mixed refrigerant natural gas liquefaction and NGL (Natural Gas Liquid) recovery integrated system Download PDF

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CN103868324A
CN103868324A CN201410083220.5A CN201410083220A CN103868324A CN 103868324 A CN103868324 A CN 103868324A CN 201410083220 A CN201410083220 A CN 201410083220A CN 103868324 A CN103868324 A CN 103868324A
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heat exchanger
natural gas
level
gas
order
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CN103868324B (en
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巨永林
贺天彪
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Ke Lin En New Energy Technology (jiangsu) Co Ltd
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Shanghai Jiao Tong University
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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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0045—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by vaporising a liquid return stream
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    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
    • F25J1/0055—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream originating from an incorporated cascade
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    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
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    • F25J1/0238—Purification or treatment step is integrated within one refrigeration cycle only, i.e. the same or single refrigeration cycle provides feed gas cooling (if present) and overhead gas cooling
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    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
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    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/34—Details about subcooling of liquids

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The invention discloses a small-sized skid-mounted mixed refrigerant natural gas liquefaction and NGL (Natural Gas Liquid) recovery integrated system. The system consists of a natural gas liquefaction module, a mixed refrigerant circulating module and an NGL recovery module, wherein the natural gas liquefaction module comprises a liquefaction cold box skid block, a low-temperature rectification skid block and a natural gas storage skid block which are sequentially connected; the mixed refrigerant circulating module comprises a mixed refrigerant compression skid block, a second-stage gas-liquid separator, a second-stage mixer, a first-stage refrigerant throttling device and a second-stage refrigerant throttling device; the NGL recovery module comprises a demethanation tower, a deethanization tower and a liquefied gas tower. The small-sized skid-mounted mixed refrigerant natural gas liquefaction and NGL recovery integrated system disclosed by the invention has the advantages that the process flow is simple, the system is quick to start, the maintenance is facilitated, the equipment skid formation is facilitated, the energy consumption is smaller and the adaptability to different gas sources is better.

Description

The natural gas liquefaction of small-sized skid-mounted type mix refrigerant and NGL reclaim integrated system
Technical field
The invention belongs to chemical industry and cryogenic engineering technical field, be specifically related to the natural gas liquefaction of a kind of small-sized skid-mounted type mix refrigerant and NGL and reclaim integrated system.
Background technology
Natural gas and oil, coal, as main in the world fossil energy, occupy very large ratio in primary energy.Natural gas is as a kind of high-quality clean energy resource, and increasing country starts to pay attention to the development and utilization of natural gas resource.
Along with continuing to optimize and the continuous growth of natural gas consumption demand of China's energy resource structure, all little present situations of the most gas field reserves of China in addition, China's natural gas insufficiency of supply-demand is continuing to increase.It is predicted, will reach 1000 × 10 to the supply breach of the year two thousand twenty China's natural gas 8m 3.
On the other hand, there is marginal gas field, association gas field, the coal bed gas field that large volume production reserves are less in China, individual well reserves are less, far away apart from gas transmission pipeline net work, adopt pipe transmission method due to unreasonable and do not obtain effective exploitation utilization economically, for a long time by the emptying of igniting the torch.Small-sized skid-mounted natural gas liquefaction device can effectively utilize these natural gas resources, pass through technique extension, small-sized skid-mounted natural gas liquefaction device is suitable for biological flue gas (comprising municipal refuse landfill gas) equally purifies and liquefaction, marine containing associated gas, the liquefaction of part coke-stove gas, coal seam natural gas (gas), shale gas exploitation etc., and market prospects are very wide.NGL recovery process can improve the economic benefit of liquefaction plant, and therefore liquefied natural gas flow process will improve the economic benefit of small-sized skid-mounted type gas plant greatly in conjunction with NGL recovery process.
Summary of the invention
The object of the invention is to overcome the deficiency that above-mentioned prior art exists, provide the natural gas liquefaction of a kind of small-sized skid-mounted type mix refrigerant and NGL to reclaim integrated system.It is simple that this small-sized skid-mounted type mix refrigerant natural gas liquefaction and NGL recovery one flow process have method, starts fast operation and maintenance convenient, and the equipment of being convenient to becomes sled.
The object of the invention is to be achieved through the following technical solutions:
The present invention relates to the natural gas liquefaction of a kind of small-sized skid-mounted type mix refrigerant and NGL and reclaim integrated system, described system comprises natural gas liquefaction module, mix refrigerant loop module and NGL recycling module, described natural gas liquefaction module comprises successively connected liquefaction ice chest sled piece, cryogenic rectification sled piece and natural gas storage sled piece, described liquefaction ice chest sled piece comprises the first order heat exchanger 10 that is connected with three phase separator 11 entrance points and connected second level heat exchanger 14, third level heat exchanger 19, fourth stage heat exchanger 21 and natural gas throttling arrangement 23 successively, and described second level heat exchanger 14 is connected with three phase separator 11 gaseous phase outlet ends, described mix refrigerant loop module is by mix refrigerant compression sled piece, second level gas-liquid separator 9, the gas being set up in parallel, liquid phase refrigerant branch road, second level blender 17, the closed circuit that second level heat exchanger 14 and first order heat exchanger 13 form, described liquid phase refrigerant props up route second level gas-liquid separator 9 liquid-phase outlet ends, first, secondary heat exchanger 10, 14, first order cold-producing medium throttling arrangement 16 is formed by connecting, described vapor phase refrigerant is propped up route second level gas-liquid separator 9 gaseous phase outlet ends, first, two, three, level Four heat exchanger 10, 14, 19, 21, second level cold-producing medium throttling arrangement 22, fourth stage heat exchanger 21, the 3rd heat exchanger 19 is formed by connecting, described NGL recycling module comprises NGL throttling arrangement 12, domethanizing column 13, ethane throttling arrangement 15, dethanizer 18 and liquefied gas tower 20, the entrance point of described NGL throttling arrangement 12 is connected with three phase separator 11 liquid-phase outlet ends, described domethanizing column 13 entrance points are connected with the port of export of NGL throttling arrangement 12 through first order heat exchanger 10, the gaseous phase outlet end of described domethanizing column 13 is successively through fourth stage heat exchanger 21, methane-rich gas throttling arrangement 24 is connected with cryogenic rectification sled piece, the liquid-phase outlet end of described domethanizing column 13 and the entrance point of dethanizer 18, the liquid-phase outlet end of dethanizer 18, liquefied gas tower 20 is connected successively, the gaseous phase outlet end of described dethanizer 18 is connected with first order heat exchanger 10 through ethane throttling arrangement 15.
Preferably, described cryogenic rectification sled piece is low-temperature fractionating tower 25, the tower bottom outlet of described low-temperature fractionating tower 25 is connected with natural gas storage sled piece, and the tower top outlet of described low-temperature fractionating tower 25 is connected successively with fourth stage heat exchanger 21, third level heat exchanger 19, second level heat exchanger 14 and first order heat exchanger 10.
Preferably, described NGL throttling arrangement 12, ethane throttling arrangement 15, first order cold-producing medium throttling arrangement 16, second level cold-producing medium throttling arrangement 22 and natural gas throttling arrangement 23 are choke valve or liquid expander.
Preferably, described mix refrigerant compression sled piece comprises first order coolant compressor 1, first order refrigerant cooler 2, first order gas-liquid separator 3, second level coolant compressor 4, second level refrigerant cooler 5, refrigerated medium pump 6, pump cooler 7 and first order blender 8, described first order coolant compressor 1, first order refrigerant cooler 2, the import of first order gas-liquid separator 3 is connected successively, the gaseous phase outlet of described first order gas-liquid separator 3 and second level coolant compressor 4, second level refrigerant cooler 5 is connected successively, the liquid-phase outlet of described first order gas-liquid separator 3 and refrigerated medium pump 6, pump cooler 7 is connected, the import of described first order blender 8 respectively with second level refrigerant cooler 5, pump cooler 7 is connected.
Preferably, described system also comprises cold-producing medium storage and proportion unit, instrument control unit, instrument wind and PSA nitrogen sled processed piece.
Preferably, described system also comprises that stable light hydrocarbon stores sled piece and LPG stores sled piece; Described stable light hydrocarbon stores sled piece and is connected with liquefied gas tower 20 liquid-phase outlet ends, and described LPG stores sled piece and is connected with liquefied gas tower 20 gaseous phase outlet ends.
Preferably, described system also comprises one or more in generator sled piece, liquid nitrogen Contingency supply unit.When source of the gas while thering is no electric power system, provide electric energy by described generator sled piece for liquefaction flow path; Liquid nitrogen Contingency supply unit is as Emergency use.
The invention still further relates to the application process that the natural gas liquefaction of a kind of aforesaid a kind of small-sized skid-mounted type mix refrigerant and NGL reclaim integrated system, comprise the steps:
A, raw natural gas enter three phase separator 11 after first order heat exchanger 10 is cooling, and three phase separator 11 tops gas phase out continues through second level heat exchanger 14, third level heat exchanger 19 and 21 cooling liquids of fourth stage heat exchanger;
B, natural gas after described steps A cooling liquid enter cryogenic rectification sled piece, after the 23 throttlings coolings of described natural gas throttling arrangement, enter low-temperature fractionating tower 25, the liquefied natural gas of low-temperature fractionating tower 25 bottoms enters fourth stage heat exchanger 21 and crosses after cold and enter natural gas storing sled piece; The flashed vapour at low-temperature fractionating tower 25 tops returns to successively described fourth stage heat exchanger 21, third level heat exchanger 19, second level heat exchanger 14 and first order heat exchanger 10 cold is provided;
C, the liquid phase obtaining through described middle three phase separator 11 middle parts are backflowed cold are provided from first order heat exchanger 10 after 12 step-downs of NGL throttling arrangement, enter subsequently domethanizing column 13 and remove methane, the methane-rich gas at domethanizing column 13 tops is after fourth stage heat exchanger 21 is cooling, by 24 step-downs of methane-rich gas throttling arrangement, enter low-temperature fractionating tower 25; The liquid phase of domethanizing column 13 bottoms enters dethanizer 18 rejecting ethanes, the ethane gas at dethanizer 18 tops after 15 step-downs of ethane throttling arrangement for first order heat exchanger 10 provides cold, the liquid of dethanizer 18 bottoms enters liquefied gas tower 20, obtain LPG from liquefied gas tower 20 tops, bottom obtains stable light hydrocarbon;
D, mix refrigerant raw material enter second level gas-liquid separator 9 through the supercharging of described mix refrigerant compression sled piece, after cooling and carry out gas-liquid separation; Isolated gas phase mix refrigerant after first order heat exchanger 10, second level heat exchanger 14, third level heat exchanger 19 and fourth stage heat exchanger 21 are cooling through the 22 throttlings coolings of second level cold-producing medium choke valve, for fourth stage heat exchanger 21 and third level heat exchanger 19 provide cold; Isolated liquid phase mix refrigerant is lowered the temperature through 16 throttlings of first order cold-producing medium choke valve after first order heat exchanger 10 and 14 precoolings of second level heat exchanger, with cold is provided from described fourth stage heat exchanger 21 and third level heat exchanger 19 mix refrigerant out mix after for second level heat exchanger 14 and first order heat exchanger 10 provide cold, from described first order heat exchanger 10 provides cold, mix refrigerant out returns to mix refrigerant compression sled piece and completes kind of refrigeration cycle.
Preferably, in step B, described liquefied natural gas pressure store is 0.40MPa.
Preferably, in step B, described liquefied natural gas needed cold more than 2 DEG C.
The operation principle of system of the present invention is: after natural gas via pretreatment, enter three phase separator through first order heat exchanger cooling down, remove residual impurity from bottom, the gas phase obtaining from three phase separator top through second and third, level Four heat exchanger cooling after liquefaction, be depressurized to and enter low-temperature fractionating tower after liquefied natural gas storage pressure and remove nitrogen by choke valve, from obtaining liquefied natural gas at the bottom of tower, return to fourth stage heat exchanger excessively cold, flash overhead gas returns to heat exchanger cold is provided, the liquid phase that three phase separator middle part obtains is first passed through choke valve throttling to domethanizing column operating pressure, then for first order heat exchanger enters domethanizing column after cold is provided, the methane-rich gas of demethanation tower top reducing pressure by regulating flow after fourth stage heat exchanger is cooling enters low-temperature fractionating tower, the liquid of domethanizing column bottom enters dethanizer, the rich ethane gas throttling obtaining from dethanizer top to feed gas compressor inlet pressure for first order heat exchanger returns to feed gas compressor circulation after cold is provided, dethanizer bottom liquid enters liquefied gas tower, at the bottom of tower, obtain stable light hydrocarbon, tower top obtains LPG, mix refrigerant is through mix refrigerant compression sled piece supercharging, cooling, enter second level gas-liquid separator, vapor phase refrigerant throttling cooling after level Four heat exchanger is cooling provides cold for second level heat exchanger, liquid phase refrigerant after two-stage heat exchanger is cooling by after choke valve throttling cooling with from third level heat exchanger refrigerant mixed out for first and second grade of heat exchanger provides cold.
Compared with prior art, the beneficial effect that the present invention has is as follows:
1, one of the present invention small-sized skid-mounted type mix refrigerant natural gas liquefaction and NGL reclaim integrated technique, effectively natural gas liquefaction process and NGL recovery process are combined, and overall energy consumption is lower, and equipment conveniently becomes sled.
The analog computation of the HYSYS software 2, extensively adopting by gas industries, proved process energy consumption is lower, stronger to different source of the gas adaptability.
Brief description of the drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is that the natural gas liquefaction of small-sized skid-mounted type mix refrigerant and NGL reclaim integrated technique flow chart;
Wherein, 1 is first order coolant compressor, 2 is first order refrigerant cooler, 3 is first order gas-liquid separator, 4 is second level coolant compressor, 5 is second level refrigerant cooler, 6 is refrigerated medium pump, 7 is pump cooler, 8 is first order blender, 9 is second level gas-liquid separator, 10 is first order heat exchanger, 11 is three phase separator, 12 is NGL throttling arrangement, 13 is domethanizing column, 14 is second level heat exchanger, 15 is ethane throttling arrangement, 16 is first order cold-producing medium choke valve, 17 is second level blender, 18 is dethanizer, 19 is third level heat exchanger, 20 is liquefied gas tower, 21 is fourth stage heat exchanger, 22 is second level cold-producing medium choke valve, 23 is natural gas throttling arrangement, 24 is methane-rich gas throttling arrangement, 25 is low-temperature fractionating tower.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
As shown in Figure 1, this system comprises natural gas liquefaction module, mix refrigerant loop module and NGL recycling module for small-sized skid-mounted type mix refrigerant of the present invention natural gas liquefaction and NGL recovery integrated system and technological process thereof.
Described natural gas liquefaction module comprises successively connected liquefaction ice chest sled piece, cryogenic rectification sled piece and natural gas storage sled piece, described liquefaction ice chest sled piece comprises the first order heat exchanger 10 that is connected with three phase separator 11 entrance points and connected second level heat exchanger 14, third level heat exchanger 19, fourth stage heat exchanger 21 and natural gas throttling arrangement 23 successively, and described second level heat exchanger 14 is connected with three phase separator 11 gaseous phase outlet ends; Described cryogenic rectification sled piece is low-temperature fractionating tower 25; The tower bottom outlet of described low-temperature fractionating tower 25 is connected with natural gas storage sled piece, and the tower top outlet of described low-temperature fractionating tower 25 is connected successively with fourth stage heat exchanger 21, third level heat exchanger 19, second level heat exchanger 14 and first order heat exchanger 10.
Described mix refrigerant loop module is by mix refrigerant compression sled piece, second level gas-liquid separator 9, the gas being set up in parallel, liquid phase refrigerant branch road, the closed circuit that second level blender 17 and back flow of refrigerant branch road form, described liquid phase refrigerant props up route second level gas-liquid separator 9 liquid-phase outlet ends, first, secondary heat exchanger 10, 14, first order cold-producing medium throttling arrangement 16 is formed by connecting, described vapor phase refrigerant is propped up route second level gas-liquid separator 9 gaseous phase outlet ends, first, two, three, level Four heat exchanger 10, 14, 19, 21, second level cold-producing medium throttling arrangement 22, fourth stage heat exchanger 21, the 3rd heat exchanger 19 is formed by connecting, described mix refrigerant compression sled piece comprises first order coolant compressor 1, first order refrigerant cooler 2, first order gas-liquid separator 3, second level coolant compressor 4, second level refrigerant cooler 5, refrigerated medium pump 6, pump cooler 7 and first order blender 8, described first order coolant compressor 1, first order refrigerant cooler 2, the import of first order gas-liquid separator 3 is connected successively, the gaseous phase outlet of described first order gas-liquid separator 3 and second level coolant compressor 4, second level refrigerant cooler 5 is connected successively, the liquid-phase outlet of described first order gas-liquid separator 3 and refrigerated medium pump 6, pump cooler 7 is connected, the import of described first order blender 8 respectively with second level refrigerant cooler 5, pump cooler 7 is connected.
Described NGL recycling module comprises NGL throttling arrangement 12, domethanizing column 13, ethane throttling arrangement 15, dethanizer 18 and liquefied gas tower 20, the entrance point of described NGL throttling arrangement 12 is connected with three phase separator 11 liquid-phase outlet ends, described domethanizing column 13 entrance points are connected with the port of export of NGL throttling arrangement 12 through first order heat exchanger 10, the gaseous phase outlet end of described domethanizing column 13 is successively through fourth stage heat exchanger 21, methane-rich gas throttling arrangement 24 is connected with cryogenic rectification sled piece, the liquid-phase outlet end of described domethanizing column 13 and the entrance point of dethanizer 18, the liquid-phase outlet end of dethanizer 18, liquefied gas tower 20 is connected successively, the gaseous phase outlet end of described dethanizer 18 is connected with first order heat exchanger 10 through ethane throttling arrangement 15.
The method of small-sized skid-mounted type mix refrigerant of the present invention natural gas liquefaction and NGL recovery integrated system of applying is specifically shown in following embodiment:
embodiment 1
Natural gas molar constituent 67.21%CH 4+ 14.23%C 2h 6+ 9.36%C 3h 8+ 2.79%i-C 4h 10+ 3.32%n-C 4h 10+ 0.07%i-C 5h 12+ 0.06%n-C 5h 12+ 0.04C 6h 14+ 2.92%N 2, pressure 5.04MPa, 40 DEG C of temperature, flow 83.92kmol/h, the concrete steps that the natural gas liquefaction of small-sized skid-mounted type mix refrigerant and NGL reclaim integrated technique are as follows:
1, raw natural gas first order heat exchanger 10 enters three phase separator 11 after being cooled to-10 DEG C, and three phase separator 11 tops gas phase out continues liquefaction after second level heat exchanger 14, third level heat exchanger 19 and fourth stage heat exchanger 21 are cooled to-160 DEG C;
2, the natural gas after step 1 cooling liquid enters cryogenic rectification sled piece, enters low-temperature fractionating tower 25 through described natural gas throttling arrangement 23 throttlings to 450kPa;
3, the liquefied natural gas obtaining through 25 bottoms of low-temperature fractionating tower in step 2 enters after fourth stage heat exchanger 21 is chilled to-150 DEG C excessively and enters natural gas storing sled piece; The flashed vapour at low-temperature fractionating tower 25 tops returns to successively fourth stage heat exchanger 21, third level heat exchanger 19, second level heat exchanger 14 and first order heat exchanger 10 cold is provided;
4, the liquid phase obtaining through 11 middle parts of three phase separator in step 1 is backflowed cold is provided from first order heat exchanger 10 after NGL throttling arrangement 12 is depressurized to 1.31MPa, and self temperature rise to 25 DEG C enters subsequently domethanizing column 13 and removes methane;
5, the methane-rich gas obtaining through 13 tops of domethanizing column in step 4 is cooled to after-159 DEG C through fourth stage heat exchanger 21, enters low-temperature fractionating tower 25 after being depressurized to 450kPa by methane-rich gas throttling arrangement 24;
6, the liquid phase that domethanizing column 13 bottoms obtain in step 5 enters dethanizer 18 rejecting ethanes, the ethane gas at dethanizer 18 tops after ethane throttling arrangement 15 is depressurized to 310kPa for first order heat exchanger 10 provides cold, the liquid of dethanizer 18 bottoms enters liquefied gas tower 20, obtain LPG from liquefied gas tower 20 tops, bottom obtains stable light hydrocarbon.
7, mix refrigerant is compressed to 800kPa through first order coolant compressor 1, then after first order refrigerant cooler 2 is cooled to 40 DEG C, enters first order gas-liquid separator 3;
8, separate through step 7 gas phase obtaining and be compressed to 3000kPa through second level coolant compressor 4, be then cooled to 40 DEG C through second level refrigerant cooler 5; Separate through step 7 liquid phase obtaining and be pressurized to 3000kPa through refrigerated medium pump 6, be then cooled to 40 DEG C through pump cooler 7;
9, the vapor phase refrigerant after step 8 supercharging and liquid phase refrigerant enter second level gas-liquid separator 9 after mixing in first order blender 8;
10, through the isolated gas phase mix refrigerant of step 9 after first order heat exchanger 10, second level heat exchanger 14, third level heat exchanger 19 and fourth stage heat exchanger 21 are cooled to-160 DEG C through second level cold-producing medium choke valve 22 throttlings to 272.8kPa, temperature is reduced to-171.8 DEG C, and then fourth stage heat exchanger 21 and third level heat exchanger 19 provide cold rewarming to-70.18 DEG C; Isolated liquid phase mix refrigerant through first order heat exchanger 10 and second level heat exchanger 14 be chilled in advance after-65 DEG C through 16 throttlings of first order cold-producing medium choke valve to after mixing with mix refrigerant out from fourth stage heat exchanger 21 and third level heat exchanger 19 provide cold after 252.8kPa for second level heat exchanger 14 and first order heat exchanger 10 provide cold.
Draw through analog computation, the specific energy consumption that this small-sized skid-mounted type mix refrigerant natural gas liquefaction and NGL reclaim integrated technique is 0.51kWh/Nm 3, product recovery rate is 97.19%.
embodiment 2
Natural gas molar constituent 77.16%CH 4+ 12.51%C 2h 6+ 4.42%C 3h 8+ 0.07%i-C 4h 10+ 0.09%n-C 4h 10+ 0.02%i-C 5h 12+ 0.02%n-C 5h 12+ 0.01C 6h 14+ 3.80%N 2, pressure 5.00MPa, temperature 45 C, flow 90.82kmol/h, the concrete steps that the natural gas liquefaction of small-sized skid-mounted type mix refrigerant and NGL reclaim integrated technique are as follows:
1, raw natural gas first order heat exchanger 10 enters three phase separator 11 after being cooled to-20 DEG C, and three phase separator 11 tops gas phase out continues liquefaction after second level heat exchanger 14, third level heat exchanger 19 and fourth stage heat exchanger 21 are cooled to-160 DEG C;
2, the natural gas after step 1 cooling liquid enters cryogenic rectification sled piece, enters low-temperature fractionating tower 25 through described natural gas throttling arrangement 23 throttlings to 450kPa;
3, the liquefied natural gas obtaining through 25 bottoms of low-temperature fractionating tower in step 2 enters after fourth stage heat exchanger 21 is chilled to-150 DEG C excessively and enters natural gas storing sled piece; The flashed vapour at low-temperature fractionating tower 25 tops returns to successively fourth stage heat exchanger 21, third level heat exchanger 19, second level heat exchanger 14 and first order heat exchanger 10 cold is provided;
4, the liquid phase obtaining through 11 middle parts of three phase separator in step 1 is backflowed cold is provided from first order heat exchanger 10 after NGL throttling arrangement 12 is depressurized to 1.31MPa, and self temperature rise to 25 DEG C enters subsequently domethanizing column 13 and removes methane;
5, the methane-rich gas obtaining through 13 tops of domethanizing column in step 4 is cooled to after-159 DEG C through fourth stage heat exchanger 21, enters low-temperature fractionating tower 25 after being depressurized to 450kPa by methane-rich gas throttling arrangement 24;
6, the liquid phase that domethanizing column 13 bottoms obtain in step 5 enters dethanizer 18 rejecting ethanes, the ethane gas at dethanizer 18 tops after ethane throttling arrangement 15 is depressurized to 310kPa for first order heat exchanger 10 provides cold, the liquid of dethanizer 18 bottoms enters liquefied gas tower 20, obtain LPG from liquefied gas tower 20 tops, bottom obtains stable light hydrocarbon.
7, mix refrigerant is compressed to 800kPa through first order coolant compressor 1, then after first order refrigerant cooler 2 is cooled to 40 DEG C, enters first order gas-liquid separator 3;
8, separate through step 7 gas phase obtaining and be compressed to 3000kPa through second level coolant compressor 4, be then cooled to 40 DEG C through second level refrigerant cooler 5; Separate through step 7 liquid phase obtaining and be pressurized to 3000kPa through refrigerated medium pump 6, be then cooled to 40 DEG C through pump cooler 7;
9, the vapor phase refrigerant after step 8 supercharging and liquid phase refrigerant enter second level gas-liquid separator 9 after mixing in first order blender 8;
10, through the isolated gas phase mix refrigerant of step 9 after first order heat exchanger 10, second level heat exchanger 14, third level heat exchanger 19 and fourth stage heat exchanger 21 are cooled to-160 DEG C through second level cold-producing medium choke valve 22 throttlings to 272.8kPa, temperature is reduced to-171.8 DEG C, and then fourth stage heat exchanger 21 and third level heat exchanger 19 provide cold rewarming to-69.27 DEG C; Isolated liquid phase mix refrigerant through first order heat exchanger 10 and second level heat exchanger 14 be chilled in advance after-65 DEG C through 16 throttlings of first order cold-producing medium choke valve to after mixing with mix refrigerant out from fourth stage heat exchanger 21 and third level heat exchanger 19 provide cold after 252.8kPa for second level heat exchanger 14 and first order heat exchanger 10 provide cold.
Draw through analog computation, the specific energy consumption of this small-sized skid-mounted type nitrogen expansion natural gas liquefaction process is 0.41kWh/Nm 3, the product recovery rate of this technique is 96.33%.Comparing embodiment 1 and embodiment 2 can find, this liquefaction process can adapt to unstripped gas variation within the specific limits, only needs certain the several parameter in adjusting process, proves that this liquefaction process has stronger adaptability to different sources of the gas.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.

Claims (10)

1. the natural gas liquefaction of small-sized skid-mounted type mix refrigerant and NGL reclaim an integrated system, it is characterized in that, described system comprises natural gas liquefaction module, mix refrigerant loop module and NGL recycling module, described natural gas liquefaction module comprises successively connected liquefaction ice chest sled piece, cryogenic rectification sled piece and natural gas storage sled piece, described liquefaction ice chest sled piece comprises the first order heat exchanger (10) that is connected with three phase separator (11) entrance point and connected second level heat exchanger (14), third level heat exchanger (19), fourth stage heat exchanger (21) and natural gas throttling arrangement (23) successively, and described second level heat exchanger (14) is connected with three phase separator (11) gaseous phase outlet end, described mix refrigerant loop module is by mix refrigerant compression sled piece, second level gas-liquid separator (9), the gas being set up in parallel, liquid phase refrigerant branch road, second level blender (17), the closed circuit that second level heat exchanger (14) and first order heat exchanger (13) form, described liquid phase refrigerant props up route second level gas-liquid separator (9) liquid-phase outlet end, first, secondary heat exchanger (10, 14), first order cold-producing medium throttling arrangement (16) is formed by connecting, described vapor phase refrigerant is propped up route second level gas-liquid separator (9) gaseous phase outlet end, first, two, three, level Four heat exchanger (10, 14, 19, 21), second level cold-producing medium throttling arrangement (22), fourth stage heat exchanger (21), the 3rd heat exchanger (19) is formed by connecting, described NGL recycling module comprises NGL throttling arrangement (12), domethanizing column (13), ethane throttling arrangement (15), dethanizer (18) and liquefied gas tower (20), the entrance point of described NGL throttling arrangement (12) is connected with three phase separator (11) liquid-phase outlet end, described domethanizing column (13) entrance point is connected with the port of export of NGL throttling arrangement (12) through first order heat exchanger (10), the gaseous phase outlet end of described domethanizing column (13) is successively through fourth stage heat exchanger (21), methane-rich gas throttling arrangement (24) is connected with cryogenic rectification sled piece, the entrance point of the liquid-phase outlet end of described domethanizing column (13) and dethanizer (18), the liquid-phase outlet end of dethanizer (18), liquefied gas tower (20) is connected successively, the gaseous phase outlet end of described dethanizer (18) is connected with first order heat exchanger (10) through ethane throttling arrangement (15).
2. small-sized skid-mounted type mix refrigerant according to claim 1 natural gas liquefaction and NGL reclaim integrated system, it is characterized in that, described cryogenic rectification sled piece is low-temperature fractionating tower (25), the tower bottom outlet of described low-temperature fractionating tower (25) is connected with natural gas storage sled piece, and the tower top outlet of described low-temperature fractionating tower (25) is connected successively with fourth stage heat exchanger (21), third level heat exchanger (19), second level heat exchanger (14) and first order heat exchanger (10).
3. small-sized skid-mounted type mix refrigerant according to claim 1 natural gas liquefaction and NGL reclaim integrated system, it is characterized in that, described NGL throttling arrangement (12), ethane throttling arrangement (15), first order cold-producing medium throttling arrangement (16), second level cold-producing medium throttling arrangement (22) and natural gas throttling arrangement (23) are choke valve or liquid expander.
4. small-sized skid-mounted type mix refrigerant according to claim 1 natural gas liquefaction and NGL reclaim integrated system, it is characterized in that, described mix refrigerant compression sled piece comprises first order coolant compressor (1), first order refrigerant cooler (2), first order gas-liquid separator (3), second level coolant compressor (4), second level refrigerant cooler (5), refrigerated medium pump (6), pump cooler (7) and first order blender (8), described first order coolant compressor (1), first order refrigerant cooler (2), the import of first order gas-liquid separator (3) is connected successively, the gaseous phase outlet of described first order gas-liquid separator (3) and second level coolant compressor (4), second level refrigerant cooler (5) is connected successively, the liquid-phase outlet of described first order gas-liquid separator (3) and refrigerated medium pump (6), pump cooler (7) be connected, the import of described first order blender (8) respectively with second level refrigerant cooler (5), pump cooler (7) is connected.
5. small-sized skid-mounted type mix refrigerant according to claim 1 natural gas liquefaction and NGL reclaim integrated system, it is characterized in that, described system also comprises cold-producing medium storage and proportion unit, instrument control unit, instrument wind and PSA nitrogen sled processed piece.
6. small-sized skid-mounted type mix refrigerant according to claim 1 natural gas liquefaction and NGL reclaim integrated system, it is characterized in that, described system also comprises generator sled piece.
7. small-sized skid-mounted type mix refrigerant according to claim 1 natural gas liquefaction and NGL reclaim integrated system, it is characterized in that, described system also comprises that stable light hydrocarbon stores sled piece and LPG stores sled piece; Described stable light hydrocarbon stores sled piece and is connected with liquefied gas tower (20) liquid-phase outlet end, and described LPG stores sled piece and is connected with liquefied gas tower (20) gaseous phase outlet end.
8. small-sized skid-mounted type mix refrigerant as claimed in claim 1 natural gas liquefaction and NGL reclaim a using method for integrated system, it is characterized in that, comprise the steps:
A, raw natural gas enter three phase separator (11) after first order heat exchanger (10) is cooling, and three phase separator (11) top gas phase out continues through second level heat exchanger (14), third level heat exchanger (19) and fourth stage heat exchanger (21) cooling liquid;
Described in B, natural gas via after described steps A cooling liquid, after natural gas throttling arrangement (23) throttling cooling, enter low-temperature fractionating tower (25), the liquefied natural gas of low-temperature fractionating tower (25) bottom enters fourth stage heat exchanger (21) and crosses after cold and enter natural gas storing sled piece; The flashed vapour at low-temperature fractionating tower (25) top returns to successively described fourth stage heat exchanger (21), third level heat exchanger (19), second level heat exchanger (14) and first order heat exchanger (10) cold is provided;
C, the liquid phase obtaining through described three phase separator (11) middle part are backflowed cold are provided from first order heat exchanger (10) after NGL throttling arrangement (12) step-down, enter subsequently domethanizing column (13) and remove methane, the methane-rich gas at domethanizing column (13) top is after fourth stage heat exchanger (21) is cooling, by methane-rich gas throttling arrangement (24) step-down, enter low-temperature fractionating tower (25); The liquid phase of domethanizing column (13) bottom enters dethanizer (18) rejecting ethane, the ethane gas at dethanizer (18) top provides cold for first order heat exchanger (10) after ethane throttling arrangement (15) step-down, the liquid of dethanizer (18) bottom enters liquefied gas tower (20), obtain LPG from liquefied gas tower (20) top, bottom obtains stable light hydrocarbon;
D, mix refrigerant raw material enter second level gas-liquid separator (9) through the supercharging of described mix refrigerant compression sled piece, after cooling and carry out gas-liquid separation; Isolated gas phase mix refrigerant after first order heat exchanger (10), second level heat exchanger (14), third level heat exchanger (19) and fourth stage heat exchanger (21) are cooling through second level cold-producing medium choke valve (22) throttling cooling, for fourth stage heat exchanger (21) and third level heat exchanger (19) provide cold; Isolated liquid phase mix refrigerant is lowered the temperature through first order cold-producing medium choke valve (16) throttling after first order heat exchanger (10) and second level heat exchanger (14) precooling, then with cold is provided from described fourth stage heat exchanger (21) and third level heat exchanger (19) mix refrigerant out mix after for second level heat exchanger (14) and first order heat exchanger (10) provide cold, from described first order heat exchanger (10) provides cold, mix refrigerant out returns to mix refrigerant and compresses and prize piece and complete kind of refrigeration cycle.
9. using method according to claim 8, is characterized in that, in step B, described liquefied natural gas pressure store is 0.40MPa.
10. using method according to claim 8, is characterized in that, in step B, described liquefied natural gas needed cold more than 2 DEG C.
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CN106524666A (en) * 2016-10-28 2017-03-22 银川天佳能源科技股份有限公司 Integral mobile natural gas liquefaction device
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