CN103215093B - Miniature skid type nitrogen expansion natural gas liquefaction system and method thereof - Google Patents
Miniature skid type nitrogen expansion natural gas liquefaction system and method thereof Download PDFInfo
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Abstract
The invention discloses a miniature skid type nitrogen expansion natural gas liquefaction system and method thereof. Natural gas is supercharged by a natural gas supercharging prying block and cooled, and enters into a natural gas depickling and dehydrating prying block for removing impurity, and is cooled by a first stage heat exchanger and then enters into a heavy hydrocarbon separator, thereby obtaining a heavy hydrocarbon from the bottom; after the heavy hydrocarbon is removed, the natural gas is cooled by a second stage heat exchanger for liquefaction; after pressure of a throttle valve is reduced to the storage pressure of the liquefied natural gas, the natural gas enters into a natural gas liquefaction separator for obtaining a liquefied natural gas, and a flash evaporation gas returns to the heat exchanger for providing cooling capacity. A nitrogen is supercharged and cooled by a nitrogen compression prying block, and is supercharged and cooled by a two-stage supercharger, and then enters into the first stage heat exchanger for precooling; after precooling, the nitrogen is expanded and refrigerated by the two-grade expander and providing a cooling capacity for liquefaction of natural gas. The miniature skid-mounted type nitrogen expansion natural gas liquefaction has the advantages of simple flow, fast starting and convenient maintenance, and is convenient for prying equipment with low energy consumption, and simultaneously has better adaptability for different gas sources.
Description
Technical field
The invention belongs to chemical industry and cryogenic engineering technical field, be specifically related to a kind of small-sized sledge-borne type nitrogen expansion natural gas liquefaction system and method thereof.
Background technology
Sweet natural gas and oil, coal, as main in the world fossil energy, occupy very large ratio in primary energy source.Sweet natural gas is as a kind of high-quality clean energy, and increasing country starts to pay attention to the development and utilization of natural gas source.
Along with continuing to optimize and the continuous growth of natural gas consumption demand of China's energy structure, all little present situations of the most natural-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 sources, pass through technique extension, small-sized skid-mounted natural gas liquefaction device is suitable for biological flue gas (comprising municipal wastes landfill gas) equally purifies and liquefaction, marine containing associated gas, the liquefaction of part coke-oven gas, coal seam Sweet natural gas (gas), shale gas exploitation etc., and market outlook are very wide.
Existing natural gas liquefaction process mainly designs for Basicloadtype natural gas liquefaction plant, and China also relatively lacks for small-sized skid-mounted natural gas liquefaction device and the liquefaction flow path of independent design.At present, small-sized natural gas liquefaction flow process generally adopts the refrigeration cycle with decompressor.In prior art, the patent No. (publication number) CN1908558A, name is called the patent of invention of " small-scaled natural gas liquification device that utilizes air separation refrigeration system ", utilize the nitrogen of air separation facility refrigeration system production as the refrigeration agent of natural gas liquefaction device, advantage is not need additionally to purchase nitrogen, shortcoming is device complexity, does not utilize device miniaturization, skid.The patent No. (publication number) CN10243570A, name is called " nitrogen expanding refrigeration liquefaction process ", a kind of nitrogen expanding refrigeration liquefaction process is disclosed, but this liquefaction process mainly, for the design of peak regulation type liquefied natural gas plant, is distinguished with small-sized sledge-borne type natural gas liquefaction flow process to some extent.
Summary of the invention
The object of the invention is to overcome the deficiency that above-mentioned prior art exists, a kind of small-sized sledge-borne type nitrogen expansion natural gas liquefaction system and method thereof are provided.This small-sized sledge-borne type nitrogen expansion natural gas LNG Lquified Process Flow is simple, 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 a kind of small-sized sledge-borne type nitrogen expansion natural gas liquefaction system, described system comprises natural gas liquefaction module and nitrogen expansion refrigeration cycle module, described natural gas liquefaction module comprises connected successively natural gas boosting sled piece, Sweet natural gas depickling sled piece, gas dehydration sled piece, liquefaction ice chest sled piece and natural gas storage sled piece, and described nitrogen expansion refrigeration cycle module comprises connected nitrogen compression sled piece and nitrogen expansion supercharging sled piece, described liquefaction ice chest sled piece comprises successively connected first step interchanger 7, heavy hydrocarbon separator 8, second stage interchanger 9, throttling valve 10, natural gas liquids separator 11, described nitrogen expansion supercharging sled piece comprises successively connected nitrogen first step supercharger 16, nitrogen third stage water cooler 17, nitrogen second stage supercharger 18, nitrogen fourth stage water cooler 19 and the nitrogen first step decompressor 20 being connected successively, nitrogen second stage decompressor 21, described first step interchanger 7 also respectively with nitrogen fourth stage water cooler 19, nitrogen first step decompressor 20 is connected, described nitrogen second stage decompressor 21 the other ends and second stage interchanger 9, first step interchanger 7, nitrogen compression sled piece is connected successively.
Preferably, the liquid-phase outlet of described natural gas liquids separator 11 is connected with natural gas storage sled piece, and the gaseous phase outlet of described natural gas liquids separator 11 is connected successively with second stage interchanger 9, first step interchanger 7.
Preferably, described nitrogen first step supercharger 16, nitrogen second stage supercharger 18 are driven by nitrogen first step decompressor 20, nitrogen second stage decompressor 21 respectively.
Preferably, gas material pressure during higher than 2.8Mpa, is not enabled the natural gas boosting sled piece in described natural gas liquefaction module.
Preferably, described natural gas boosting sled piece comprises successively connected Sweet natural gas first step compressor 1, Sweet natural gas first step water cooler 2, Sweet natural gas high stage compressor 3, Sweet natural gas second stage water cooler 4.
Preferably, described nitrogen compression sled piece comprises successively connected nitrogen first step compressor 12, nitrogen first step water cooler 13, nitrogen high stage compressor 14, nitrogen second-stage cooler 15.
Preferably, described Sweet natural gas depickling sled piece comprises extracting tower 5, and described gas dehydration sled piece comprises dehydration tower 6, and described natural gas storage sled piece comprises LNG tank 22.
Preferably, described system also comprises the heat-conducting oil furnace sled piece for extracting tower 5, dehydration tower 6 reprocessing cycle.
Preferably, described system also comprises one or more in generator sled piece, liquid nitrogen Contingency supply unit, instrument control unit, instrument wind, PSA nitrogen processed unit.When source of the gas while thering is no power supply system, provide electric energy by described generator sled piece for liquefaction flow path; Liquid nitrogen Contingency supply unit is as Emergency use.
A kind of method that the invention still further relates to small-sized sledge-borne type nitrogen expansion natural gas liquefaction system natural gas liquids of application of aforementioned, comprises the steps:
A, raw natural gas enter described Sweet natural gas depickling sled piece, gas dehydration sled piece imurity-removal successively through the supercharging of described natural gas boosting sled piece, after cooling;
B, Sweet natural gas after described steps A purifies enter liquefaction ice chest sled piece, after described first step interchanger 7 cooling downs, enter heavy hydrocarbon separator 8, obtain heavy hydrocarbon from bottom, remove natural gas via second stage interchanger 9 cooling liquids after heavy hydrocarbon, through throttling valve 10 reducing pressure by regulating flows to natural gas liquids pressure store, enter natural gas liquids separator 11, obtain liquefied natural gas product from bottom, flashed vapour returns to described second stage interchanger 9 successively and first step interchanger 7 provides cold;
C, nitrogen is through the supercharging of described nitrogen compression sled piece, after cooling, enter nitrogen expansion supercharging sled piece, through nitrogen first step supercharger 16, nitrogen third stage water cooler 17, nitrogen second stage supercharger 18, 19 superchargings of nitrogen fourth stage water cooler, after cooling, enter described first step interchanger 7 precoolings, after the nitrogen of precooling, enter nitrogen first step decompressor 20, nitrogen second stage decompressor 21 swell refrigerations, the nitrogen of the low-pressure low-temperature obtaining returns to second stage interchanger 9 successively, first step interchanger 7 provides cold, the nitrogen that obtains temperature rising reenters described nitrogen compression sled piece.
Preferably, in steps A, described raw natural gas pressure during higher than 2.8Mpa, is not enabled the natural gas boosting sled piece in described natural gas liquefaction module.
Preferably, in step B, the temperature of the described Sweet natural gas through first step interchanger 7 cooling downs is heavy hydrocarbon separation temperature.
Preferably, in step B, described natural gas liquids pressure store is 0.30MPa.
Preferably, in step C, the nitrogen pressure that described nitrogen second stage decompressor 21 exports is higher than 0.1MPa.
Compared with prior art, the beneficial effect that the present invention has is as follows:
1, small-sized sledge-borne type nitrogen expansion natural gas liquefaction process of the present invention, under the lower prerequisite of guarantor unit's liquefaction energy consumption, simple flow, it is convenient that this flow process has the fast operation and maintenance of startup, is convenient to the feature that equipment becomes to prize.
The analog calculation of the HYSYS software 2, extensively adopting by gas industries, proved liquefaction process energy consumption is lower, stronger to different source of the gas adaptability, is the liquefaction flow path that is relatively applicable to small-sized skid-mounted natural gas liquefaction device.
Accompanying drawing explanation
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 small-sized sledge-borne type nitrogen expansion natural gas LNG Lquified Process Flow figure;
Wherein, 1 is Sweet natural gas first step compressor, 2 is Sweet natural gas first step water cooler, 3 is Sweet natural gas high stage compressor, 4 is Sweet natural gas second stage water cooler, 5 is extracting tower, 6 is dehydration tower, 7 is first step interchanger, 8 is heavy hydrocarbon separator, 9 is second stage interchanger, 10 is throttling valve, 11 is natural gas liquids separator, 12 is nitrogen first step compressor, 13 is nitrogen first step water cooler, 14 is nitrogen high stage compressor, 15 is nitrogen second-stage cooler, 16 is nitrogen first step supercharger, 17 is nitrogen third stage water cooler, 18 is nitrogen second stage supercharger, 19 is nitrogen fourth stage water cooler, 20 is nitrogen first step decompressor, 21 is nitrogen second stage decompressor, 22 is LNG tank.
Embodiment
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 (also claiming: natural gas liquefaction loop) and nitrogen expansion refrigeration cycle module (also claiming: nitrogen expansion refrigeration cycle) for small-sized sledge-borne type nitrogen expansion natural gas liquefaction system of the present invention and technical process thereof.
Described natural gas liquefaction loop comprises LNG tank 22 and the Sweet natural gas first step compressor 1 being connected successively, Sweet natural gas first step water cooler 2, Sweet natural gas high stage compressor 3, Sweet natural gas second stage water cooler 4, extracting tower 5, dehydration tower 6, first step interchanger 7, heavy hydrocarbon separator 8, second stage interchanger 9, throttling valve 10, natural gas liquids separator 11; The liquid-phase outlet of described natural gas liquids separator 11 is connected with LNG tank 22, and the gaseous phase outlet of described natural gas liquids separator 11 is connected successively with second stage interchanger 9, first step interchanger 7.
Described Sweet natural gas first step compressor 1, Sweet natural gas first step water cooler 2, Sweet natural gas high stage compressor 3, Sweet natural gas second stage water cooler 4 form natural gas boosting sled piece (when Sweet natural gas feed pressure is during higher than 2.8Mpa, not enabling this natural gas boosting sled piece); Described extracting tower 5 can form Sweet natural gas depickling sled piece; Described dehydration tower 6 can form gas dehydration sled piece; Described first step interchanger 7, heavy hydrocarbon separator 8, second stage interchanger 9, throttling valve 10, natural gas liquids separator 11 composition liquefaction ice chest sled pieces; Described LNG tank 22 can form separately natural gas storage sled piece.
Described nitrogen expansion refrigeration cycle comprises successively connected nitrogen first step compressor 12, nitrogen first step water cooler 13, nitrogen high stage compressor 14, nitrogen second-stage cooler 15, nitrogen first step supercharger 16, nitrogen third stage water cooler 17, nitrogen second stage supercharger 18, nitrogen fourth stage water cooler 19 and the nitrogen first step decompressor 20 being connected successively, nitrogen second stage decompressor 21; First step interchanger 7 in described natural gas liquefaction loop is also connected with nitrogen fourth stage water cooler 19, nitrogen first step decompressor 20 respectively, and described nitrogen second stage decompressor 21 the other ends are connected successively with second stage interchanger 9, first step interchanger 7, nitrogen compression sled piece in natural gas liquefaction loop.
Described nitrogen first step compressor 12, nitrogen first step water cooler 13, nitrogen high stage compressor 14, nitrogen second-stage cooler 15 forms nitrogen compression sled piece; Described nitrogen first step supercharger 16, nitrogen third stage water cooler 17, nitrogen second stage supercharger 18, nitrogen fourth stage water cooler 19 and nitrogen first step decompressor 20, nitrogen second stage decompressor 21 form nitrogen expansion supercharging sled piece.
In nitrogen expansion refrigeration cycle, described nitrogen first step supercharger 16, nitrogen second stage supercharger 18 are driven by nitrogen first step decompressor 20, nitrogen second stage decompressor 21 respectively.
Small-sized sledge-borne type nitrogen expansion natural gas liquefaction system of the present invention also optionally comprises generator sled piece, liquid nitrogen Contingency supply unit, instrument control unit, instrument wind, PSA nitrogen processed unit and the heat-conducting oil furnace sled piece for extracting tower 5, dehydration tower 6 reprocessing cycle.When source of the gas while thering is no power supply system, provide electric energy by described generator sled piece for liquefaction flow path; Liquid nitrogen Contingency supply unit is as Emergency use.
Apply the method for small-sized sledge-borne type nitrogen expansion natural gas liquefaction system natural gas liquids of the present invention and specifically see following embodiment:
Sweet natural gas molar constituent 92%CH
4+ 4%C
3h
8+ 4%N
2, pressure 1.2MPa, 30 ℃ of temperature, flow 1kmol/h, the concrete steps of small-sized sledge-borne type nitrogen expansion natural gas liquefaction process are as follows:
1, natural gas via two-stage compressor (Sweet natural gas first step compressor 1, Sweet natural gas high stage compressor 3) is compressed to 2.85MPa, is cooled to 40 ℃ through water cooler (Sweet natural gas first step water cooler 2, Sweet natural gas second stage water cooler 4);
2, through the cooled Sweet natural gas of step 1 enter extracting tower 5, dehydration tower 6 removes CO
2, H
2s, H
2the impurity such as O;
3, after the Sweet natural gas after step 2 purifies is cooled to-60 ℃ (being heavy hydrocarbon separation temperature) through first step interchanger 7, enter heavy hydrocarbon separator 8, obtain heavy hydrocarbon from bottom;
4, the natural gas via second stage interchanger 9 after step 3 is removed heavy hydrocarbon is cooled to-153 ℃;
5, the Sweet natural gas obtaining through step 4 is by a throttling valve 10, reducing pressure by regulating flow is to 0.30MPa, enter natural gas liquids separator 11, obtain liquefied natural gas product from bottom, flashed vapour returns to two interchanger (second stage interchanger 9 and first step interchanger 7) cold is provided;
6, nitrogen is pressurized to 1.1MPa by two-stage compressor (nitrogen first step compressor 12, nitrogen high stage compressor 14), is cooled to 40 ℃ through water cooler (nitrogen first step water cooler 13, nitrogen second-stage cooler 15);
7, be pressurized to 2.59MPa through the cooled high pressure nitrogen of step 6 through two-step supercharging machine (nitrogen first step supercharger 16, nitrogen second stage supercharger 18), be cooled to after 40 ℃ through water cooler (nitrogen third stage water cooler 17, nitrogen fourth stage water cooler 19), enter first step interchanger 7 and be chilled in advance-42 ℃;
8, enter successively double expansion machine (nitrogen first step decompressor 20, nitrogen second stage decompressor 21) through the nitrogen of step 7 precooling and be depressurized to 0.178MPa, temperature is returned to two interchanger (second stage interchanger 9 and first step interchanger 7) cold is provided after reducing to-154.9 ℃, and makes self temperature rising;
9, the nitrogen after step 8 rewarming to 39 ℃ reenters nitrogen first step compressor 12 and completes circulation.
Draw through analog calculation, the unit consumption of energy of this small-sized sledge-borne type nitrogen expansion natural gas liquefaction process is 0.43kWh/Nm
3, more general nitrogen inflation fluid metallization processes 0.5-0.6kWh/Nm
3unit consumption of energy reduced 14%-28%.The liquefied fraction of this liquefaction process is 96.5%.
Sweet natural gas molar constituent 90%CH
4+ 6%C
3h
8+ 4%N
2, pressure 1.7MPa, 25 ℃ of temperature, flow 1kmol/h, the concrete steps of small-sized sledge-borne type nitrogen expansion natural gas liquefaction process are as follows:
1, natural gas via two-stage compressor (Sweet natural gas first step compressor 1, Sweet natural gas high stage compressor 3) is compressed to 2.85MPa, is cooled to 40 ℃ through water cooler (Sweet natural gas first step water cooler 2, Sweet natural gas second stage water cooler 4);
2, through the cooled Sweet natural gas of step 1 enter extracting tower 5, dehydration tower 6 removes CO
2, H
2s, H
2the impurity such as O;
3, after the Sweet natural gas after step 2 purifies is cooled to-60 ℃ (being heavy hydrocarbon separation temperature) through first step interchanger 7, enter heavy hydrocarbon separator 8, obtain heavy hydrocarbon from bottom;
4, the natural gas via second stage interchanger 9 after step 3 is removed heavy hydrocarbon is cooled to-153 ℃;
5, the Sweet natural gas obtaining through step 4 is by a throttling valve 10, reducing pressure by regulating flow is to 0.30MPa, enter natural gas liquids separator 11, obtain liquefied natural gas product from bottom, flashed vapour returns to two interchanger (second stage interchanger 9 and first step interchanger 7) cold is provided;
6, nitrogen is pressurized to 1.1MPa by two-stage compressor (nitrogen first step compressor 12, nitrogen high stage compressor 14), is cooled to 40 ℃ through water cooler (nitrogen first step water cooler 13, nitrogen second-stage cooler 15);
7, be pressurized to 2.59MPa through the cooled high pressure nitrogen of step 6 through two-step supercharging machine (nitrogen first step supercharger 16, nitrogen second stage supercharger 18), be cooled to after 40 ℃ through water cooler (nitrogen third stage water cooler 17, nitrogen fourth stage water cooler 19), enter first step interchanger 7 and be chilled in advance-42 ℃;
8, enter successively double expansion machine (nitrogen first step decompressor 20, nitrogen second stage decompressor 21) through the nitrogen of step 7 precooling and be depressurized to 0.178MPa, temperature is returned to two interchanger (second stage interchanger 9 and first step interchanger 7) cold is provided after reducing to-154.9 ℃, and makes self temperature rising;
9, the nitrogen after step 8 rewarming to 39.7 ℃ reenters nitrogen first step compressor 12 and completes circulation.
Draw through analog calculation, the unit consumption of energy of this small-sized sledge-borne type nitrogen expansion natural gas liquefaction process is 0.41kWh/Nm
3, more general nitrogen inflation fluid metallization processes 0.5-0.6kWh/Nm
3unit consumption of energy reduced 18%-32%.The liquefied fraction of this liquefaction process is 96.4%.Comparing embodiment 1 and embodiment 2 can find, this liquefaction process can adapt to unstripped gas variation within the specific limits, and does not need to adjust other parameters in liquefaction process, proves that this liquefaction process has stronger adaptability to different sources of the gas.
Sweet natural gas molar constituent 80%CH
4+ 6%C
3h
8+ 14%N
2, pressure 2.8MPa, 20 ℃ of temperature, flow 1kmol/h, the concrete steps of small-sized sledge-borne type nitrogen expansion natural gas liquefaction process are as follows:
1, gas pressure reaches 2.8MPa, so can omit step 1;
2, Sweet natural gas enters extracting tower 5, dehydration tower 6 removes CO
2, H
2s, H
2the impurity such as O;
3, after the Sweet natural gas after step 2 purifies is cooled to-60 ℃ (being heavy hydrocarbon separation temperature) through first step interchanger 7, enter heavy hydrocarbon separator 8, obtain heavy hydrocarbon from bottom.
4, the natural gas via second stage interchanger 9 after step 3 is removed heavy hydrocarbon is cooled to-153 ℃;
5, the Sweet natural gas obtaining through step 4 is by a throttling valve 10, reducing pressure by regulating flow is to 0.30MPa, enter natural gas liquids separator 11, obtain liquefied natural gas product from bottom, flashed vapour returns to two interchanger (second stage interchanger 9 and first step interchanger 7) cold is provided;
6, nitrogen is pressurized to 1.1MPa by two-stage compressor (nitrogen first step compressor 12, nitrogen high stage compressor 14), is cooled to 40 ℃ through water cooler (nitrogen first step water cooler 13, nitrogen second-stage cooler 15);
7, be pressurized to 2.62MPa through the cooled high pressure nitrogen of step 6 through two-step supercharging machine (nitrogen first step supercharger 16, nitrogen second stage supercharger 18), be cooled to after 40 ℃ through water cooler (nitrogen third stage water cooler 17, nitrogen fourth stage water cooler 19), enter first step interchanger 7 and be chilled in advance-42 ℃;
8, enter successively double expansion machine (nitrogen first step decompressor 20, nitrogen second stage decompressor 21) through the nitrogen of step 7 precooling and be depressurized to 0.17MPa, temperature is returned to two interchanger (second stage interchanger 9 and first step interchanger 7) cold is provided after reducing to-156.6 ℃, and makes self temperature rising;
9, the nitrogen after step 8 rewarming to 36 ℃ reenters nitrogen first step compressor 12 and completes circulation.
Draw through analog calculation, the unit consumption of energy of this small-sized sledge-borne type nitrogen expansion natural gas liquefaction process is 0.42kWh/Nm
3, the general nitrogen inflation fluid of dumpling metallization processes 0.5-0.6kWh/Nm
3unit consumption of energy reduced 16%-30%.The liquefied fraction of this liquefaction process is 85.7%.Comparing embodiment 1, embodiment 2 and embodiment 3 can find, in the time that the component of unstripped gas and condition change greatly, this liquefaction process still can guarantee in technique that most parameters need not be adjusted and can change to another kind from a kind of source of the gas, prove that this liquefaction process has stronger adaptability to different sources of the gas, this is vital for small-sized sledge-borne type natural gas liquefaction process.
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 modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (13)
1. a small-sized sledge-borne type nitrogen expansion natural gas liquefaction system, described system comprises natural gas liquefaction module and nitrogen expansion refrigeration cycle module, it is characterized in that, described natural gas liquefaction module comprises connected successively natural gas boosting sled piece, Sweet natural gas depickling sled piece, gas dehydration sled piece, liquefaction ice chest sled piece and natural gas storage sled piece, and described nitrogen expansion refrigeration cycle module comprises connected nitrogen compression sled piece and nitrogen expansion supercharging sled piece, described liquefaction ice chest sled piece comprises successively connected first step interchanger (7), heavy hydrocarbon separator (8), second stage interchanger (9), throttling valve (10) and natural gas liquids separator (11), described nitrogen expansion supercharging sled piece comprises successively connected nitrogen first step supercharger (16), nitrogen third stage water cooler (17), nitrogen second stage supercharger (18), nitrogen fourth stage water cooler (19) and the nitrogen first step decompressor (20) being connected successively, nitrogen second stage decompressor (21), described first step interchanger (7) also respectively with nitrogen fourth stage water cooler (19), nitrogen first step decompressor (20) is connected, described nitrogen second stage decompressor (21) the other end and second stage interchanger (9), first step interchanger (7), nitrogen compression sled piece is connected successively.
2. small-sized sledge-borne type nitrogen expansion natural gas liquefaction system according to claim 1, it is characterized in that, the liquid-phase outlet of described natural gas liquids separator (11) is connected with natural gas storage sled piece, and the gaseous phase outlet of described natural gas liquids separator (11) is connected successively with second stage interchanger (9), first step interchanger (7).
3. small-sized sledge-borne type nitrogen expansion natural gas liquefaction system according to claim 1, it is characterized in that, described nitrogen first step supercharger (16), nitrogen second stage supercharger (18) are driven by nitrogen first step decompressor (20), nitrogen second stage decompressor (21) respectively.
4. small-sized sledge-borne type nitrogen expansion natural gas liquefaction system according to claim 1, it is characterized in that, described natural gas boosting sled piece comprises successively connected Sweet natural gas first step compressor (1), Sweet natural gas first step water cooler (2), Sweet natural gas high stage compressor (3), Sweet natural gas second stage water cooler (4).
5. small-sized sledge-borne type nitrogen expansion natural gas liquefaction system according to claim 1, it is characterized in that, described nitrogen compression sled piece comprises successively connected nitrogen first step compressor (12), nitrogen first step water cooler (13), nitrogen high stage compressor (14), nitrogen second-stage cooler (15).
6. small-sized sledge-borne type nitrogen expansion natural gas liquefaction system according to claim 1, it is characterized in that, described Sweet natural gas depickling sled piece comprises extracting tower (5), and described gas dehydration sled piece comprises dehydration tower (6), and described natural gas storage sled piece comprises LNG tank (22).
7. small-sized sledge-borne type nitrogen expansion natural gas liquefaction system according to claim 6, is characterized in that, described system also comprises the heat-conducting oil furnace sled piece for extracting tower (5), dehydration tower (6) reprocessing cycle.
8. small-sized sledge-borne type nitrogen expansion natural gas liquefaction system according to claim 1, is characterized in that, described system also comprises one or more in generator sled piece, liquid nitrogen Contingency supply unit, instrument control unit, instrument wind, PSA nitrogen processed unit.
9. application rights requires a method for the small-sized sledge-borne type nitrogen expansion natural gas liquefaction system natural gas liquids described in 1, it is characterized in that, comprises the steps:
A, raw natural gas enter described Sweet natural gas depickling sled piece, gas dehydration sled piece imurity-removal successively through the supercharging of described natural gas boosting sled piece, after cooling;
B, Sweet natural gas after described steps A purifies enter liquefaction ice chest sled piece, after described first step interchanger (7) cooling down, enter heavy hydrocarbon separator (8), obtain heavy hydrocarbon from bottom, remove natural gas via second stage interchanger (9) cooling liquid after heavy hydrocarbon, through throttling valve (10) reducing pressure by regulating flow to natural gas liquids pressure store, enter natural gas liquids separator (11), obtain liquefied natural gas product from bottom, flashed vapour returns to successively described second stage interchanger (9) and first step interchanger (7) provides cold;
C, nitrogen is through the supercharging of described nitrogen compression sled piece, after cooling, enter nitrogen expansion supercharging sled piece, through nitrogen first step supercharger (16), nitrogen third stage water cooler (17), nitrogen second stage supercharger (18), nitrogen fourth stage water cooler (19) supercharging, after cooling, enter described first step interchanger (7) precooling, after the nitrogen of precooling, enter nitrogen first step decompressor (20), nitrogen second stage decompressor (21) swell refrigeration, the nitrogen of the low-pressure low-temperature obtaining returns to second stage interchanger (9) successively, first step interchanger (7) provides cold, the nitrogen that obtains temperature rising reenters described nitrogen compression sled piece.
10. the method for natural gas liquids according to claim 9, is characterized in that, in steps A, described raw natural gas pressure during higher than 2.8Mpa, is not enabled the natural gas boosting sled piece in described natural gas liquefaction module.
The method of 11. natural gas liquids according to claim 9, is characterized in that, in step B, the temperature of the described Sweet natural gas through first step interchanger (7) cooling down is heavy hydrocarbon separation temperature.
The method of 12. natural gas liquids according to claim 9, is characterized in that, in step B, described natural gas liquids pressure store is 0.30MPa.
The method of 13. natural gas liquids according to claim 9, is characterized in that, in step C, the nitrogen pressure of described nitrogen second stage decompressor (21) outlet is higher than 0.1MPa.
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