CN102654346A - Propane pre-cooling double-mixing refrigerant parallel-connection liquefaction system - Google Patents
Propane pre-cooling double-mixing refrigerant parallel-connection liquefaction system Download PDFInfo
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- CN102654346A CN102654346A CN2012101599389A CN201210159938A CN102654346A CN 102654346 A CN102654346 A CN 102654346A CN 2012101599389 A CN2012101599389 A CN 2012101599389A CN 201210159938 A CN201210159938 A CN 201210159938A CN 102654346 A CN102654346 A CN 102654346A
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Abstract
The invention discloses a propane pre-cooling double-mixing refrigerant parallel-connection liquefaction system, which comprises a pre-cooling cold box, two liquefaction cold boxes, a propane pre-cooling circulating mechanism and two mixed refrigerant liquefaction deep-cooling circulating mechanisms, wherein the propane pre-cooling circulating mechanism comprises a three-grade compression unit; and each mixed refrigerant liquefaction deep-cooling circulating mechanism comprises a first-grade compression unit. The liquefaction system provided by the invention adopts a propane pre-cooling double-mixing refrigerant parallel-connection refrigeration mode, and liquefaction and undercooling circulation adopt double-mixing refrigerant refrigeration circulation; the power distribution of three compressor units (one propane compressor and two mixing refrigerant compressors) is effectively balanced; the limitation on that the processing capability of the whole liquefaction device is affected because one compressor has too large power can be broken through; and the liquefaction capability of the device can be improved according to the maximum limitation of the current single compressor.
Description
Technical field
The present invention relates to the two azeotrope parallel connection of a kind of propane precooling liquefaction system, be specifically related to a kind of two azeotrope parallel connection of propane precooling liquefaction system that is applied to basic lotus type natural gas liquefaction plant, belong to the natural gas liquefaction technical field.
Background technology
Mostly domestic common natural gas liquefaction technology is that nitrogen expands, single-stage mixing cryogen circulates or series connection liquefying refrigerating technology at present, the LNG device that the scale that can only be applicable to is less.The liquefaction technology that is used for basic lotus type natural gas liquefaction plant abroad; Propane precooling more employing still formula or shell-and-tube heat exchanger, heat exchange property is not good, causes the equipment investment waste; Deep cooling adopts and causes equipment investment high around heat exchange of heat pipe, and is high to the import equipment dependence.
In the liquefaction technology of base lotus type natural gas liquefaction plant; The device fabrication ability of compressor and motor affects production-scale size, adopts the parallel-connection type hydraulic metallization processes, helps the precooling of balance natural gas; Liquefaction; Cross the heat exchange load of each section in the cold process, the load of each section of balance compressor helps production-scale expansion.
Summary of the invention
The purpose of this invention is to provide a kind of easy to operate, safe and reliable, high, the adaptable two azeotropes parallel connection of the propane precooling liquefaction system that is applied to basic lotus type natural gas liquefaction plant of efficient.
The two azeotrope parallel connection of a kind of propane precooling provided by the present invention liquefaction system comprises precooling ice chest, 2 liquefaction ice chests, propane precooling cycling mechanism and 2 azeotrope liquefaction deep cooling cycling mechanisms;
Said propane precooling cycling mechanism comprises three grades of compression units, and said three grades of compression units comprise propane compressor a, propane compressor b and the propane compressor c that links to each other successively; Said three grades of compression units are connected with propane knockout drum a, propane knockout drum b and propane knockout drum c successively; The gaseous phase outlet of said propane knockout drum a, propane knockout drum b and propane knockout drum c is connected with said propane compressor a, propane compressor b and propane compressor c successively, is equipped with choke valve between said propane compressor a, propane knockout drum a, propane knockout drum b and the propane knockout drum c; Be provided with the propane compressor last condenser stage between the outlet of said propane compressor a and the said propane knockout drum a, this propane compressor last condenser stage is located at the arrival end of said choke valve; Said propane knockout drum a, propane knockout drum b and propane knockout drum c all are connected with said precooling ice chest;
Each said azeotrope liquefaction deep cooling cycling mechanism includes the one-level compression unit, and this one-level compression unit comprises continuous azeotrope compressor and azeotrope compressor cooler; The outlet of said azeotrope compressor cooler is connected with the top of each said precooling ice chest through pipeline a, and draws the back from the bottom of said precooling ice chest and be connected with azeotrope knockout drum a; The liquid phase outlet of said azeotrope knockout drum a is connected with the top of said liquefaction ice chest through pipeline b, and after the liquefaction stages of said liquefaction ice chest is drawn, is connected with azeotrope gas-liquid separator b, and this connection place is provided with said choke valve; The gaseous phase outlet of said azeotrope knockout drum a is connected with the liquefaction stages and the deep cooling section of said liquefaction ice chest through pipeline c successively; And draw the back from the deep cooling section of said deep cooling ice chest and be connected with azeotrope knockout drum c, this connection place is provided with said choke valve; The gaseous phase outlet of said azeotrope knockout drum c and liquid phase outlet all are connected with the deep cooling section of said deep cooling ice chest through pipeline d, and its deep cooling section from said deep cooling ice chest is drawn the back and is connected with said azeotrope knockout drum b; The gaseous phase outlet of said azeotrope knockout drum b and liquid phase outlet all are connected with the liquefaction stages of said liquefaction ice chest through pipeline e, and its top from said liquefaction ice chest is drawn the back and is connected with the inlet of said azeotrope compressor.
The two azeotrope parallel connection of above-mentioned propane precooling liquefaction system; Said propane precooling cycling mechanism also comprises propane compressor d and the propane knockout drum d that is connected with said propane compressor c successively; Said propane knockout drum d is connected with propane knockout drum c; This connection place is provided with said choke valve, and said propane knockout drum d is connected with said precooling ice chest.
The two azeotrope parallel connection of above-mentioned propane precooling liquefaction system, said choke valve can be the J/T valve.
Liquefaction system provided by the invention; Adopt the two azeotrope parallel connection of propane precooling refrigeration modes; Two azeotrope kind of refrigeration cycle are adopted in liquefaction and excessively cold circulation; Effective balanced power division of three compressor groups (1 propane compressor, 2 azeotrope compressors) has been broken owing to the excessive restriction that influences the disposal ability of whole liquefying plant of a compressor power, can be according to the current separate unit compressor capacity liquefying power of lifting device to greatest extent.
Description of drawings
Fig. 1 is the structural representation of the two azeotrope parallel connection of propane precooling provided by the invention liquefaction system.
Each mark is following among the figure: 1 precooling ice chest, 2,2 ' liquefaction ice chest, 31 propane compressor a, 32 propane compressor b, 33 propane compressor c, 34 propane compressor d, 41 propane knockout drum a, 42 propane knockout drum b, 43 propane knockout drum c, 44 propane knockout drum d, 5 propane compressor last condenser stage, 61,62,63; 64,65,66; 67,67 ' J/T valve, 7,7 ' azeotrope compressor, 8; 8 ' azeotrope compressor cooler, 101,101 ' pipeline a, 102,102 ' pipeline b, 103; 103 ' pipeline c, 104,104 ' pipeline d, 105,105 ' pipeline e, 111; 111 ' azeotrope knockout drum a, 112,112 ' azeotrope knockout drum b, 113,113 ' azeotrope knockout drum c, 9 pipeline f, 10 heavy hydrocarbon knockout drums.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further specified, but the present invention is not limited to following examples.
The two azeotropes parallel connection of the propane precooling that present embodiment provides liquefaction system comprise precooling ice chest 1, liquefaction ice chest 2 and 2 ' and propane precooling cycling mechanism and with liquefaction ice chest 2 and 2 ' the 2 supporting cover azeotropes deep cooling cycling mechanisms that liquefy; Propane precooling cycling mechanism comprises propane compressor a31, propane compressor b32, propane compressor c33 and the propane compressor d34 that is connected successively; The outlet of propane compressor a31 is connected with propane knockout drum a41, propane knockout drum b42, propane knockout drum c43 and propane knockout drum d44 successively; Be provided with propane compressor last condenser stage 5 and J/T valve 61 between propane compressor a31 and the propane knockout drum a41 successively, be provided with J/T valve 62, J/T valve 63 and J/T valve 64 successively between propane knockout drum a41, propane knockout drum b42, propane knockout drum c43 and the propane knockout drum d44; The gaseous phase outlet of propane knockout drum a41, propane knockout drum b42, propane knockout drum c43 is connected with propane compressor a31, propane compressor b32, propane compressor c33 and propane compressor d34 successively; The equal precooling ice chest 1 of propane compressor a31, propane compressor b32, propane compressor c33 and propane compressor d34 is connected; Every cover azeotrope liquefaction deep cooling cycling mechanism comprises azeotrope compressor 7 (7 ') and the azeotrope compressor cooler 8 (8 ') that is connected successively; The outlet of azeotrope compressor cooler 8 (8 ') is connected with the top of precooling ice chest 1 through pipeline a101 (101 '), and draws the back from the bottom of precooling ice chest 1 and be connected with azeotrope knockout drum a111 (111 '); The liquid phase outlet of this azeotrope knockout drum a111 (111 ') is connected with the top of liquefaction ice chest 2 (2 ') through pipeline b102 (102 '); And draw the back from the liquefaction stages of liquefaction ice chest 2 (2 ') and be connected with azeotrope knockout drum b112 (112 '), this connection place is provided with J/T valve 65; The gaseous phase outlet of this azeotrope knockout drum a111 (111 ') is connected with the liquefaction stages and the deep cooling section of liquefaction ice chest 2 (2 ') through pipeline c103 (103 '); And draw the back from the deep cooling section of liquefaction ice chest 2 (2 ') and be connected with azeotrope knockout drum c113 (113 '), this connection place is provided with J/T valve 66; The gaseous phase outlet of azeotrope knockout drum c113 (113 ') and liquid phase outlet all are connected with the deep cooling section of liquefaction ice chest 2 (2 ') through pipeline d104 (104 '), and after the deep cooling section of liquefaction ice chest 2 (2 ') is drawn, are connected with azeotrope knockout drum b112 (112 '); The outlet of the gaseous phase outlet of azeotrope knockout drum b112 (112 ') and liquid phase all is connected with the liquefaction stages of liquefaction ice chest 2 (2 ') through pipeline e105 (105 '), and draws from the top of the ice chest 2 (2 ') that liquefies and then to be connected with azeotrope compressor 7.
Use the raw natural gas liquefaction of the two azeotrope associating of above-mentioned propane precooling liquefaction system to overseas certain gas field, the unstripped gas mole consists of 95.1% methane, 4.39% ethane; 0.29% propane, butane 0.11%, iso-butane 0.11%; It is 3,700,000 tons that C5+0.18%, this device produce the LNG amount per year; Adopt azeotrope to form by 41.01% methane, 32.46% ethene, 20.50% propane, 6.03% nitrogen.Main implementation step is following:
Phase propane after 1 heat exchange of precooling ice chest gets into propane compressor a31, propane compressor b32, propane compressor c33 and propane compressor d33 respectively and is compressed to 1.66MPaA through four sections; Getting into propane compressor last condenser stage 5 then successively is condensed to 45 ℃ and is delivered to precooling ice chest 1;, first order J-T valve 61 is divided into two strands after being decompressed to 685kPaA; One gets into 1 first section evaporation of precooling ice chest provides precooling first section required cold, and the propane after the evaporation returns propane compressor a31 inlet; Another stock-traders' know-how is crossed and is divided into two strands again after second level J-T valve 62 is decompressed to 400kPaA; One gets into 1 second section evaporation of precooling ice chest to provide precooling second section required cold; Propane after the evaporation returns propane compressor b32 inlet; Another thigh is divided into two strands again after being decompressed to 240kPaA through third level J-T valve 63 again, and one gets into the 3rd section evaporation of precooling ice chest 1 to provide precooling the 3rd section required cold, and the propane after the evaporation returns propane compressor c33 inlet again; Another strand petrogas gets into the 4th section evaporation of precooling ice chest 1 after being decompressed to 150kPaA through fourth stage J-T valve 64 again; So that the 4th section required cold of precooling to be provided, the propane after the evaporation turns back to propane compressor d33 inlet, accomplishes propane cycles; The cold that the evaporation of the LPG of four sections different pressures of this precooling recycle provides, will reduce to-29.8 ℃ from raw natural gas and azeotrope that pipeline f9 feeds after, after heavy hydrocarbon knockout drum 10 separates heavy hydrocarbons, get into the ice chest 2 (2 ') that liquefies.
Low pressure azeotrope temperature from liquefaction ice chest 2 (2 ') is about-35.9 ℃, and pressure is 280KPaA, gets into azeotrope 7 (7 ') of compressor and is compressed to 4.00MpaA; High pressure-temperature gas phase azeotrope after the compression at first after azeotrope compressor cooler 8 (8 ') is cooled to 45 ℃, gets into 1 precooling of precooling ice chest to-29.8 ℃ approximately then; Azeotrope after the precooling gets into azeotrope knockout drum a111 (111 ') and carries out gas-liquid separation; Liquid-phase mixing cryogen after the separation is crossed cold through the liquefaction stages of liquefaction ice chest 2 (2 ') and after 65 throttlings of J-T valve are returned liquefaction ice chest 2 (2 ') to 344KPaA cold is provided; The gas phase azeotrope is crossed J-T valve 66 throttlings of cold back to 337KPaA through the liquefaction stages and the deep cooling section of liquefaction ice chest 2 (2 '); Return deep cooling ice chest 2 (2 ') and cold is provided for deep cooling ice chest 2 (2 '); Liquid-phase mixing cryogen after the preceding with it throttling of low-temperature mixed cryogen after the heat exchange converges, and gets into liquefaction ice chest 2 (2 ') and for the liquefaction ice chest cold is provided; After the final heat exchange the gas phase azeotrope get into azeotrope compressor 7 compression inlets, accomplish a circulation; The azeotrope circulation is reduced to-157 ℃ with the natural gas after the precooling, passes through J-T valve 67 (67 ') after two strands of natural gases mix again and is cooled to-160 ℃ liquefied natural gas entering LNG storage tank approximately.
Use liquefaction system provided by the invention to of the raw natural gas liquefaction of certain cold marine site with certain component; Wherein propane precooling cycling mechanism comprises three grades of compression units; Propane compressor final stage outlet pressure is 951.5kPaA; Propane after the supercharging is through condenser condenses, and temperature is reduced to 20 ℃, and all the other structures are identical with the above-mentioned liquefaction system that provides.
Because the cooler outlet temperature in propane precooling cycling mechanism and the azeotrope liquefaction deep cooling cycling mechanism all reduces, the also corresponding reduction of each section of propane compressor outlet pressure is with energy efficient.Phase propane after the heat exchange of precooling ice chest gets into propane compressor inlets at different levels respectively; Rise to 951.5KPaA through pressure after three sections compressions; The entering condenser condenses is 20 ℃ a LPG; Be divided into two strands after process first order choke valve is decompressed to 405kPaA, one gets into first section evaporation of precooling ice chest provides precooling first section required cold, and the propane after the evaporation returns three sections inlets of propane compressor; Another stock-traders' know-how is crossed second level choke valve throttling and to 240kPaA, is divided into two strands again; One gets into second section evaporation of precooling ice chest to provide precooling second section required cold, and the propane after the evaporation returns two sections inlets of propane compressor, after another thigh is decompressed to 150kPaA through third level choke valve again; Get into the 3rd section evaporation of precooling ice chest; So that the 3rd section required cold of precooling to be provided, the propane after the evaporation turns back to one section inlet of propane compressor, accomplishes propane compression refrigeration circulation.After the heat exchange of precooling ice chest, natural gas and azeotrope temperature are reduced to-29.8 ℃.The flow process of azeotrope in ice chest is identical in the above-mentioned liquefaction system that provides with it, and the gas phase azeotrope after the heat exchange gets into the azeotrope compressor and is compressed to 4MPaA, at first gets into cooler and is cooled to 20 ℃, gets into the precooling ice chest then; The azeotrope circulation is reduced to-157 ℃ with the natural gas after the precooling, finally is cooled to-160 ℃ liquefied natural gas entering LNG storage tank through throttling.
Claims (3)
1. the two azeotropes parallel connection of propane precooling liquefaction system, it is characterized in that: said liquefaction system comprises precooling ice chest, 2 liquefaction ice chests, propane precooling cycling mechanism and 2 azeotropes liquefaction deep cooling cycling mechanisms;
Said propane precooling cycling mechanism comprises three grades of compression units, and said three grades of compression units comprise propane compressor a, propane compressor b and the propane compressor c that links to each other successively; Said three grades of compression units are connected with propane knockout drum a, propane knockout drum b and propane knockout drum c successively; The gaseous phase outlet of said propane knockout drum a, propane knockout drum b and propane knockout drum c is connected with said propane compressor a, propane compressor b and propane compressor c successively, is equipped with choke valve between said propane compressor a, propane knockout drum a, propane knockout drum b and the propane knockout drum c; Be provided with the propane compressor last condenser stage between the outlet of said propane compressor a and the said propane knockout drum a, this propane compressor last condenser stage is located at the arrival end of said choke valve; Said propane knockout drum a, propane knockout drum b and propane knockout drum c all are connected with said precooling ice chest;
Each said azeotrope liquefaction deep cooling cycling mechanism includes the one-level compression unit, and this one-level compression unit comprises continuous azeotrope compressor and azeotrope compressor cooler; The outlet of said azeotrope compressor cooler is connected with the top of each said precooling ice chest through pipeline a, and draws the back from the bottom of said precooling ice chest and be connected with azeotrope knockout drum a; The liquid phase outlet of said azeotrope knockout drum a is connected with the top of said liquefaction ice chest through pipeline b, and after the liquefaction stages of said liquefaction ice chest is drawn, is connected with azeotrope gas-liquid separator b, and this connection place is provided with said choke valve; The gaseous phase outlet of said azeotrope knockout drum a is connected with the liquefaction stages and the deep cooling section of said liquefaction ice chest through pipeline c successively; And draw the back from the deep cooling section of said deep cooling ice chest and be connected with azeotrope knockout drum c, this connection place is provided with said choke valve; The gaseous phase outlet of said azeotrope knockout drum c and liquid phase outlet all are connected with the deep cooling section of said deep cooling ice chest through pipeline d, and its deep cooling section from said deep cooling ice chest is drawn the back and is connected with said azeotrope knockout drum b; The gaseous phase outlet of said azeotrope knockout drum b and liquid phase outlet all are connected with the liquefaction stages of said liquefaction ice chest through pipeline e, and its top from said liquefaction ice chest is drawn the back and is connected with the inlet of said azeotrope compressor.
2. liquefaction system according to claim 1; It is characterized in that: said propane precooling cycling mechanism also comprises propane compressor d and the propane knockout drum d that is connected with said propane compressor c successively; Said propane knockout drum d is connected with propane knockout drum c; This connection place is provided with said choke valve, and said propane knockout drum d is connected with said precooling ice chest.
3. according to arbitrary described system among the claim 1-3, it is characterized in that: said choke valve is the J/T valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101599389A CN102654346A (en) | 2012-05-22 | 2012-05-22 | Propane pre-cooling double-mixing refrigerant parallel-connection liquefaction system |
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| CN2012101599389A CN102654346A (en) | 2012-05-22 | 2012-05-22 | Propane pre-cooling double-mixing refrigerant parallel-connection liquefaction system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020248328A1 (en) * | 2019-06-11 | 2020-12-17 | 中国石油工程建设有限公司 | Three-cycle natural gas liquefaction apparatus and method suitable for ultra-large scale |
| RU2796115C1 (en) * | 2019-06-11 | 2023-05-17 | ЧАЙНА ПЕТРОЛЕУМ ИНЖИНИРИНГ энд КОНСТРАКШН КОРП. | Device and method for three-cycle natural gas liquefaction suitable for ultra-large scale |
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Application publication date: 20120905 |