CN204705107U - The natural gas liquefaction system of a kind of pair of swell refrigeration technique - Google Patents
The natural gas liquefaction system of a kind of pair of swell refrigeration technique Download PDFInfo
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- CN204705107U CN204705107U CN201520372350.0U CN201520372350U CN204705107U CN 204705107 U CN204705107 U CN 204705107U CN 201520372350 U CN201520372350 U CN 201520372350U CN 204705107 U CN204705107 U CN 204705107U
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Abstract
The utility model relates to the natural gas liquefaction system of a kind of pair of swell refrigeration technique, it is characterized in that: comprise precooling module, liquefaction module and cross cold module; The gas outlet of precooling module connects the gas inlet of liquefaction module, and the gas outlet of liquefaction module connected the gas inlet of cold module; The cold refrigerant outlet of mistake crossing cold module connects the cold refrigerant inlet of mistake of liquefaction module, and the liquefied refrigerant outlet of liquefaction module connects the liquefied refrigerant entrance of precooling module.Wherein, precooling module is used for for the cold-producing medium in liquefaction module and natural gas carry out precooling, and shares part liquefaction load; Liquefaction module is used for carrying out cooling and liquefying for natural gas, and provides cold for the cold-producing medium in the cold module of mistake; Crossing cold module is that the natural gas of liquefaction module post liquefaction carries out continuations and cools.The utility model flexibility is strong, energy consumption is low, be easy to through engineering approaches, can be widely used in the gas deliquescence process in refrigeration and low temperature.
Description
Technical field
The utility model relates to natural gas liquefaction system field, particularly about the natural gas liquefaction system of a kind of pair of swell refrigeration technique.
Background technology
LNG (Liquefied Natural Gas), i.e. liquefied natural gas, is that the natural gas of gaseous state under normal pressure is after treatment cooled to-162 DEG C, makes it to condense into liquid.The volume of LNG is about 1/625 of its gaseous volume, has greatly saved storage and transportation space and cost, and has that calorific value is large, performance high.Therefore, LNG is a kind of clean, efficient energy.
The liquefaction process of natural gas mainly contains three classes, is stepwise liquefaction process, mix refrigerant liquefaction process and expander refrigeration liquefying technique respectively.Stepwise liquefaction process adopts multi stage refrigeration cycle, and different cold-producing medium evaporates to obtain the horizontal cold of different temperatures at different temperatures, natural gas is cooled step by step, reaches the object of liquefaction; The advantage of stepwise liquefaction process is that energy consumption is low, but its complex process, equipment is many, safeguards inconvenience.Mix refrigerant liquefaction process is the technique that current LNG device both at home and abroad the most often adopts, utilizes the temperature-changing characteristic of mix refrigerant in heat exchanger, can match with the natural gas of blending ingredients, thus reach the object reducing heat transfer temperature difference between cold fluid and hot fluid; Its shortcoming is that the accurate proportioning of mix refrigerant is comparatively difficult, and the equipment such as compressor is easily revealed, and then causes mix refrigerant component deviation design parameter, causes system effectiveness to decline.Expander refrigeration liquefying technique compares first two liquefaction process, energy consumption is higher, but system flow is simple, volume is little, easy to operate, cost of investment is low, to feed gas composition change strong adaptability, the middle-size and small-size natural gas liquefaction plant application less in liquefaction amount is comparatively extensive.The liquefaction process of existing natural gas, comprise nitrogen expanding refrigeration liquefaction process, propane pre-cooling nitrogen expansion natural gas liquefaction process, without precooling double-stage nitrogen expansion natural gas liquefaction process, the band n-formyl sarcolysine alkane list expansion natural gas liquefaction system of precooling, expansion combustible gas liquefaction device and flow process etc., there is very flexible in above-mentioned existing expander refrigeration liquefying technique, energy consumption high and low load operation efficiency is low, is difficult to be suitable for the natural gas liquefaction device that source of the gas parameter fluctuation is large, operating flexibility is large.
Summary of the invention
For the problems referred to above, the purpose of this utility model is to provide that a kind of flexibility is strong, energy consumption is low, be easy to the natural gas liquefaction system of two swell refrigeration techniques of through engineering approaches.
For achieving the above object, the utility model takes following technical scheme: the natural gas liquefaction system of a kind of pair of swell refrigeration technique, is characterized in that: comprise precooling module, liquefaction module and cross cold module; The gas outlet of described precooling module connects the gas inlet of described liquefaction module, and the gas outlet of described liquefaction module connects the gas inlet of the cold module of described mistake; The cold refrigerant outlet of mistake of the cold module of described mistake connects the cold refrigerant inlet of mistake of described liquefaction module, and the liquefied refrigerant outlet of described liquefaction module connects the liquefied refrigerant entrance of described precooling module.
Described precooling module is made up of precool heat exchanger device, and described precool heat exchanger device comprises raw material precooling zone gas inlet, precooling zone gas outlet, precooling zone liquefied refrigerant entrance, the outlet of precooling zone liquefied refrigerant, precooling refrigerant inlet and precooling refrigerant outlet; Described precooling zone gas inlet connects outside gas pipeline, described precooling zone gas outlet connects the entrance of described liquefaction module, described precooling zone liquefied refrigerant entrance connects described liquefaction module outlet, described precooling zone liquefied refrigerant outlet connects the entrance in described liquefaction module, described precooling refrigerant inlet connects the outlet of outside precooling refrigeration system PCR, and described precooling refrigerant outlet connects the entrance of described precooling refrigeration system PCR.
Described liquefaction module comprises liquefaction stages compressor, liquefaction stages one-level cooler, liquefaction stages secondary coolers, liquefaction stages check-valves, liquefaction stages level 2 buffering tank, liquefaction stages turbo-expander, liquefaction stages three grades of coolers, current divider, liquefaction stages heat exchanger, blender, liquefaction stages first-level buffer tank and heavy hydrocarbon separator, wherein, described liquefaction stages compressor is provided with the outlet of liquefaction stages stage compressor entrance, liquefaction stages stage compressor outlet, liquefaction stages split-compressor entrance and liquefaction stages split-compressor, described liquefaction stages turbo-expander is provided with liquefaction stages suction port of compressor, liquefaction stages compressor outlet, liquefaction stages expander inlet and liquefaction stages expander outlet, described liquefaction stages heat exchanger is provided with liquefaction stages first gas inlet, liquefaction stages first gas outlet, liquefaction stages second gas inlet, liquefaction stages second gas outlet, liquefaction stages crosses cold refrigerant inlet, liquefaction stages crosses cold refrigerant outlet, liquefaction stages crosses cold cold-producing medium low-pressure inlet, liquefaction stages crosses cold cold-producing medium low tension outlet, liquefaction stages liquefied refrigerant entrance, liquefaction stages liquefied refrigerant exports, liquefaction stages liquefied refrigerant low-pressure inlet and liquefaction stages liquefied refrigerant low tension outlet, described liquefaction stages stage compressor entrance connects the outlet of described liquefaction stages first-level buffer tank, described liquefaction stages stage compressor outlet connects the entrance of described liquefaction stages one-level cooler, described liquefaction stages split-compressor entrance connects the outlet of described liquefaction stages one-level cooler, and described liquefaction stages split-compressor outlet connects the entrance of described liquefaction stages secondary coolers, the outlet of described liquefaction stages secondary coolers connects the entrance of described liquefaction stages level 2 buffering tank by described liquefaction stages first check-valves, the outlet of described liquefaction stages level 2 buffering tank connects the described liquefaction stages suction port of compressor of described liquefaction stages turbo-expander, the described liquefaction stages compressor outlet of described liquefaction stages turbo-expander connects the entrance of described liquefaction stages three grades of coolers, the outlet of described liquefaction stages three grades of coolers connects the entrance of described current divider, a wherein outlet of described current divider is the liquefied refrigerant high-pressure outlet of described liquefaction module, connect the described precooling zone liquefied refrigerant entrance of described precooling module, another outlet connects the described liquefaction stages liquefied refrigerant entrance of described liquefaction stages heat exchanger, the described liquefaction stages liquefied refrigerant outlet of described liquefaction stages heat exchanger connects the entrance of described blender, the outlet of described blender connects the described liquefaction stages expander inlet of described liquefaction stages turbo-expander, the described liquefaction stages expander outlet of described liquefaction stages turbo-expander connects the described liquefaction stages liquefied refrigerant low-pressure inlet of described liquefaction stages heat exchanger, the described liquefaction stages liquefied refrigerant low tension outlet of described liquefaction stages heat exchanger connects the entrance of described liquefaction stages first-level buffer tank, described liquefaction stages first gas inlet of described liquefaction stages heat exchanger connects the described precooling zone gas outlet of described precooling module, described liquefaction stages first gas outlet of described liquefaction stages heat exchanger connects the entrance of described heavy hydrocarbon separator, a wherein outlet of described heavy hydrocarbon separator is in communication with the outside, and another outlet connects described liquefaction stages second gas inlet of described liquefaction stages heat exchanger, described liquefaction stages second gas outlet of described liquefaction stages heat exchanger connects the described super cooled sect gas inlet of the cold module of described mistake, the described liquefaction stages of described liquefaction stages heat exchanger crosses the cold refrigerant high pressure entrance of mistake that cold refrigerant inlet is described liquefaction module, connect the cold module outlet of described mistake, the described liquefaction stages of described liquefaction stages heat exchanger crosses the cold refrigerant high pressure outlet of mistake that cold refrigerant outlet is described liquefaction module, connects the cold module inlet of described mistake, the described liquefaction stages of described liquefaction stages heat exchanger crosses the cold cold-producing medium low-pressure inlet of mistake that cold cold-producing medium low-pressure inlet is described liquefaction module, connect the outlet of the cold module of described mistake, it is that the mistake cold cold-producing medium low tension outlet of described liquefaction module connects the cold module of described mistake that the described liquefaction stages of described liquefaction stages heat exchanger crosses cold cold-producing medium low tension outlet.
The cold module of described mistake comprises super cooled sect compressor, super cooled sect one-level cooler, super cooled sect secondary coolers, super cooled sect check-valves, super cooled sect level 2 buffering tank, super cooled sect turbo-expander, super cooled sect three grades of coolers, super cooled sect heat exchanger, super cooled sect the 3rd by-pass valve control and super cooled sect first-level buffer tank, wherein, described super cooled sect compressor is provided with the outlet of super cooled sect stage compressor entrance, super cooled sect stage compressor outlet, super cooled sect split-compressor entrance and super cooled sect split-compressor, described super cooled sect turbo-expander is provided with super cooled sect suction port of compressor, super cooled sect compressor outlet, crosses cold refrigerant high pressure entrance and cross cold cold-producing medium low tension outlet, described super cooled sect heat exchanger is provided with super cooled sect gas inlet, super cooled sect gas outlet, super cooled sect crosses cold cold-producing medium low-pressure inlet and super cooled sect crosses cold cold-producing medium low tension outlet, the described super cooled sect stage compressor entrance of described super cooled sect compressor connects the outlet of described super cooled sect first-level buffer tank, the described super cooled sect stage compressor outlet of described super cooled sect compressor connects the entrance of described super cooled sect one-level cooler, the described super cooled sect split-compressor entrance of described super cooled sect compressor connects the outlet of described super cooled sect one-level cooler, the described super cooled sect split-compressor outlet of described super cooled sect compressor connects the entrance of described liquefaction stages secondary coolers, the outlet of described super cooled sect secondary coolers connects the entrance of described super cooled sect level 2 buffering tank by described super cooled sect check-valves, the outlet of described super cooled sect level 2 buffering tank connects the described super cooled sect suction port of compressor of described super cooled sect turbo-expander, the described super cooled sect compressor outlet of described super cooled sect turbo-expander connects the entrance of described super cooled sect three grades of coolers, the described liquefaction stages that the outlet of described super cooled sect three grades of coolers connects described liquefaction module crosses cold refrigerant inlet, the described super cooled sect gas inlet of described super cooled sect heat exchanger is the natural gas high pressure entrance of the cold module of described mistake, connect described liquefaction stages second gas outlet of described liquefaction module, the described super cooled sect gas outlet of described super cooled sect heat exchanger connects LNG storage tank by described super cooled sect the 3rd by-pass valve control, the described mistake cold refrigerant high pressure entrance of described super cooled sect turbo-expander is the cold refrigerant high pressure entrance of mistake of the cold module of described mistake, and the described liquefaction stages connecting described liquefaction module crosses cold refrigerant outlet, the described super cooled sect that the described mistake cold cold-producing medium low tension outlet of described super cooled sect turbo-expander connects described super cooled sect heat exchanger crosses cold cold-producing medium low-pressure inlet, the described super cooled sect of described super cooled sect heat exchanger crosses the cold cold-producing medium low tension outlet of mistake that cold cold-producing medium low tension outlet is the cold module of described mistake, the described liquefaction stages connecting described liquefaction stages heat exchanger crosses cold cold-producing medium low-pressure inlet, and the described liquefaction stages of described liquefaction stages heat exchanger crosses the entrance that cold cold-producing medium low tension outlet connects described super cooled sect first-level buffer tank.
Described precooling refrigeration system PCR adopts propane, ammonia, carbon dioxide or freon refrigeration system.
The utility model is owing to taking above technical scheme, it has the following advantages: 1, the utility model comprises precooling module, liquefaction module and crosses cold module, adopt liquefaction module and cross cold module two and overlap independently-inflatable refrigeration system, liquefaction module expansion refrigeration system provides liquefaction cold, crosses cold module expansion refrigeration system and provides cold amount; Two cover expansion refrigeration systems can only open a set of refrigeration system when underload or a set of fault, and the continuous service ability of aggrandizement apparatus, also improves the operating flexibility of device; After the natural gas liquefaction system increase precooling module of two swell refrigeration, the disposal ability of aggrandizement apparatus, reduces energy consumption.2, the utility model is due to liquefaction system streamlining, compact conformation, and therefore modularized design is easy to through engineering approaches, only need connect reserved pipeline, greatly reduce cost of investment and the maintenance cost of system when job site is installed.The utility model can be widely used in the gas deliquescence process in refrigeration and low temperature.
Accompanying drawing explanation
Fig. 1 is the utility model modular construction schematic diagram;
Fig. 2 is the structural representation of precooling module of the present utility model;
Fig. 3 is the structural representation of liquefaction module of the present utility model;
Fig. 4 is the structural representation of the cold module of mistake of the present utility model;
Fig. 5 is integrally-built schematic diagram of the present utility model.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in detail.
As shown in Figure 1, dinitrogen expansion natural gas liquefaction system of the present utility model comprises precooling module 1, liquefaction module 2 and crosses cold module 3; The gas outlet of precooling module 1 connects the gas inlet of liquefaction module 2, and the gas outlet of liquefaction module 2 connected the gas inlet of cold module 3; The cold refrigerant outlet of mistake crossing cold module 3 connects the cold refrigerant inlet of mistake of liquefaction module 2, and the liquefied refrigerant outlet of liquefaction module 2 connects the liquefied refrigerant entrance of precooling module 1; Wherein, precooling module 1 for carrying out precooling for the cold-producing medium in liquefaction module 2 and natural gas, and shares part liquefaction load; Liquefaction module 2 for carrying out cooling and liquefying for natural gas, and for mistake cold module 3 in cold-producing medium cold is provided; Crossing cold module 3 is that the natural gas of liquefaction module 2 post liquefaction carries out continuations and cools.
In a preferred embodiment, as shown in Figure 2, precooling module 1 is made up of precool heat exchanger device 1-1, and precool heat exchanger device 1-1 comprises raw material precooling zone gas inlet A1, precooling zone gas outlet A2, precooling zone liquefied refrigerant entrance B1, precooling zone liquefied refrigerant outlet B2, precooling refrigerant inlet C1 and precooling refrigerant outlet C2; Precooling zone gas inlet A1 connects outside gas pipeline, precooling zone gas outlet A2 connects the entrance of liquefaction module 2, precooling zone liquefied refrigerant entrance B1 connects liquefaction module 2 and exports, precooling zone liquefied refrigerant outlet B2 connects the entrance in liquefaction module 2, precooling refrigerant inlet C1 connects the outlet of outside precooling refrigeration system PCR, and precooling refrigerant outlet C2 connects the entrance of precooling refrigeration system PCR; Wherein, precooling refrigeration system PCR is external system, for providing cold for precool heat exchanger device 1-1, can adopt propane, ammonia, carbon dioxide or freon refrigeration system.
In a preferred embodiment, as shown in Figure 3, the module 2 that liquefies comprises liquefaction stages compressor 2-1, liquefaction stages one-level cooler 2-2, liquefaction stages secondary coolers 2-3, liquefaction stages check-valves 2-4, liquefaction stages level 2 buffering tank 2-5, liquefaction stages turbo-expander 2-6, liquefaction stages three grades of cooler 2-7, current divider 2-8, liquefaction stages heat exchanger 2-9, blender 2-10, liquefaction stages first-level buffer tank 2-11 and heavy hydrocarbon separator 2-12, wherein, liquefaction stages compressor 2-1 is provided with liquefaction stages stage compressor entrance E1, liquefaction stages stage compressor outlet E2, liquefaction stages split-compressor entrance E3 and liquefaction stages split-compressor outlet E4, liquefaction stages turbo-expander 2-6 is provided with liquefaction stages suction port of compressor E5, liquefaction stages compressor outlet E6, liquefaction stages expander inlet E7 and liquefaction stages expander outlet E8, liquefaction stages heat exchanger 2-9 is provided with liquefaction stages first gas inlet A3, liquefaction stages first gas outlet A4, liquefaction stages second gas inlet A5, liquefaction stages second gas outlet A6, liquefaction stages crosses cold refrigerant inlet D1, liquefaction stages crosses cold refrigerant outlet D2, liquefaction stages crosses cold cold-producing medium low-pressure inlet D5, liquefaction stages crosses cold cold-producing medium low tension outlet D6, liquefaction stages liquefied refrigerant entrance B3, liquefaction stages liquefied refrigerant outlet B4, liquefaction stages liquefied refrigerant low-pressure inlet B5 and liquefaction stages liquefied refrigerant low tension outlet B6, liquefaction stages stage compressor entrance E1 connects the outlet of liquefaction stages first-level buffer tank 2-11, liquefaction stages stage compressor outlet E2 connects the entrance of liquefaction stages one-level cooler 2-2, liquefaction stages split-compressor entrance E3 connects the outlet of liquefaction stages one-level cooler 2-2, and liquefaction stages split-compressor outlet E4 connects the entrance of liquefaction stages secondary coolers 2-3, the outlet of liquefaction stages secondary coolers 2-3 connects the entrance of liquefaction stages level 2 buffering tank 2-5 by liquefaction stages first check-valves 2-4, the outlet of liquefaction stages level 2 buffering tank 2-5 connects the liquefaction stages suction port of compressor E5 of liquefaction stages turbo-expander 2-6, the liquefaction stages compressor outlet E6 of liquefaction stages turbo-expander 2-6 connects the entrance of liquefaction stages three grades of cooler 2-7, the outlet of liquefaction stages three grades of cooler 2-7 connects the entrance of current divider 2-8, a wherein outlet of current divider 2-8 is the liquefied refrigerant high-pressure outlet of liquefaction module 2, connect the precooling zone liquefied refrigerant entrance B1 of precooling module 1, another outlet connects the liquefaction stages liquefied refrigerant entrance B3 of liquefaction stages heat exchanger 2-9, the liquefaction stages liquefied refrigerant outlet B4 of liquefaction stages heat exchanger 2-9 connects the entrance of blender 2-10, the outlet of blender 2-10 connects the liquefaction stages expander inlet E7 of liquefaction stages turbo-expander 2-6, the liquefaction stages expander outlet E8 of liquefaction stages turbo-expander 2-6 connects the liquefaction stages liquefied refrigerant low-pressure inlet B5 of liquefaction stages heat exchanger 2-9, the liquefaction stages liquefied refrigerant low tension outlet B6 of liquefaction stages heat exchanger 2-9 connects the entrance of liquefaction stages first-level buffer tank 2-11, the liquefaction stages first gas inlet A3 of liquefaction stages heat exchanger 2-9 connects the precooling zone gas outlet A2 of precooling module 1, the liquefaction stages first gas outlet A4 of liquefaction stages heat exchanger 2-9 connects the entrance of heavy hydrocarbon separator 2-12, and a wherein outlet of heavy hydrocarbon separator 2-12 is in communication with the outside, and another outlet connects the liquefaction stages second gas inlet A5 of liquefaction stages heat exchanger 2-9, the liquefaction stages second gas outlet A6 of liquefaction stages heat exchanger 2-9 connected the super cooled sect gas inlet A7 of cold module 3, the liquefaction stages of liquefaction stages heat exchanger 2-9 crosses the cold refrigerant high pressure entrance of mistake that cold refrigerant inlet D1 is liquefaction module 2, connected cold module 3 to export, the liquefaction stages of liquefaction stages heat exchanger 2-9 crosses the cold refrigerant high pressure outlet of mistake that cold refrigerant outlet D2 is liquefaction module 2, connects cold module 3 entrance, the liquefaction stages of liquefaction stages heat exchanger 2-9 crosses the cold cold-producing medium low-pressure inlet of mistake that cold cold-producing medium low-pressure inlet D5 is liquefaction module 2, connected the outlet of cold module 3, it is that the mistake cold cold-producing medium low tension outlet of liquefaction module 2 connected cold module 3 that the liquefaction stages of liquefaction stages heat exchanger 2-9 crosses cold cold-producing medium low tension outlet D6.
In a preferred embodiment, as shown in Figure 4, cross cold module 3 and comprise super cooled sect compressor 3-1, super cooled sect one-level cooler 3-2, super cooled sect secondary coolers 3-3, super cooled sect check-valves 3-4, super cooled sect level 2 buffering tank 3-5, super cooled sect turbo-expander 3-6, super cooled sect three grades of cooler 3-7, super cooled sect heat exchanger 3-8, super cooled sect the 3rd by-pass valve control 3-9 and super cooled sect first-level buffer tank 3-10, wherein, super cooled sect compressor 3-1 is provided with super cooled sect stage compressor entrance F1, super cooled sect stage compressor outlet F2, super cooled sect split-compressor entrance F3 and super cooled sect split-compressor outlet F4, super cooled sect turbo-expander 3-6 is provided with super cooled sect suction port of compressor F5, super cooled sect compressor outlet F6, crosses cold refrigerant high pressure entrance F7 and cross cold cold-producing medium low tension outlet F8, super cooled sect heat exchanger 3-8 is provided with super cooled sect gas inlet A7, super cooled sect gas outlet A8, super cooled sect crosses cold cold-producing medium low-pressure inlet D3 and super cooled sect crosses cold cold-producing medium low tension outlet D4, the super cooled sect stage compressor entrance F1 of super cooled sect compressor 3-1 connects the outlet of super cooled sect first-level buffer tank 3-10, the super cooled sect stage compressor outlet F2 of super cooled sect compressor 3-1 connects the entrance of super cooled sect one-level cooler 3-2, the super cooled sect split-compressor entrance F3 of super cooled sect compressor 3-1 connects the outlet of super cooled sect one-level cooler 3-2, the super cooled sect split-compressor outlet F4 of super cooled sect compressor 3-1 connects the entrance of liquefaction stages secondary coolers 3-3, the outlet of super cooled sect secondary coolers 3-3 connects the entrance of super cooled sect level 2 buffering tank 3-5 by super cooled sect check-valves 3-4, the outlet of super cooled sect level 2 buffering tank 3-5 connects the super cooled sect suction port of compressor F5 of super cooled sect turbo-expander 3-6, the super cooled sect compressor outlet F6 of super cooled sect turbo-expander 3-6 connects the entrance of super cooled sect three grades of cooler 3-7, the liquefaction stages that the outlet of super cooled sect three grades of cooler 3-7 connects the module 2 that liquefies crosses cold refrigerant inlet D1, the super cooled sect gas inlet A7 of super cooled sect heat exchanger 3-8 was the natural gas high pressure entrance of cold module 3, connect the liquefaction stages second gas outlet A6 of liquefaction module 2, the super cooled sect gas outlet A8 of super cooled sect heat exchanger 3-8 connects LNG storage tank by super cooled sect the 3rd by-pass valve control 3-9, the mistake cold refrigerant high pressure entrance F7 of super cooled sect turbo-expander 3-6 was the cold refrigerant high pressure entrance of mistake of cold module 3, and the liquefaction stages connecting liquefaction module 2 crosses cold refrigerant outlet D2, the super cooled sect of the mistake cold cold-producing medium low tension outlet F8 connection super cooled sect heat exchanger 3-8 of super cooled sect turbo-expander 3-6 crosses cold cold-producing medium low-pressure inlet D3, the super cooled sect of super cooled sect heat exchanger 3-8 crosses the cold cold-producing medium low tension outlet of mistake that cold cold-producing medium low tension outlet D4 was cold module 3, the liquefaction stages connecting liquefaction stages heat exchanger 2-9 crosses cold cold-producing medium low-pressure inlet D5, and the liquefaction stages of liquefaction stages heat exchanger 2-9 crosses the entrance of cold cold-producing medium low tension outlet D6 connection super cooled sect first-level buffer tank 3-10.
As shown in Figure 5, be described in detail to the natural gas liquefaction system operation principle of of the present utility model pair of swell refrigeration technique below, detailed process is:
After raw natural gas after purified treatment enters and cools in precool heat exchanger device 1-1, be transported to liquefaction stages heat exchanger 2-9 to cool further, cooled natural gas transport carries out heavy hydrocarbon separation to heavy hydrocarbon separator 2-12, wherein, isolated liquid phase heavy hydrocarbon is drained into the external world, gas phase natural gas via liquefaction stages heat exchanger 2-9 continuation cooling after separation and post liquefaction are transported to super cooled sect heat exchanger 3-8 and carry out continuation cooling, obtain liquefied natural gas product (LNG) after the natural gas of post liquefaction carries out pressure regulation, and the liquefied natural gas product obtained is delivered to extraneous LNG storage tank.
Liquefaction module 2 carries out cooling and liquefying for natural gas, and provides cold for the cold-producing medium of the cold module 3 of mistake, liquefied refrigerant enters liquefaction stages one-level cooler 2-2 and cools carry out one stage of compression in liquefaction stages compressor 2-1 after, get back to liquefaction stages compressor 2-1 after cooling and carry out two-stage compression, enter liquefaction stages secondary coolers 2-3 after two-stage compression again to cool, the supercharger that cooled cold-producing medium enters liquefaction stages turbo-expander 2-6 by liquefaction stages level 2 buffering tank 2-5 compresses, and the cold-producing medium after compression is transported to liquefaction stages three grades of cooler 2-7 and cools, cooled cold-producing medium enters current divider 2-8 and shunts, part of refrigerant after shunting enters in precool heat exchanger device 1-1 and cools, another part cold-producing medium enters liquefaction stages heat exchanger 2-9 and cools, cold-producing medium through precool heat exchanger device 1-1 and liquefaction stages heat exchanger 2-9 output enters blender 2-10 and mixes, mixed cold-producing medium enters liquefaction stages turbo-expander 2-6 and carries out expansion step-down refrigeration, cold-producing medium after expansion step-down enters liquefaction stages heat exchanger 2-9, for liquefaction stages heat exchanger 2-9 provides cold, cold-producing medium after temperature raises comes back to liquefaction stages compressor 2-1 through liquefaction stages level 2 buffering tank 2-5, complete the circulation of liquefaction module 2.
Crossing cold module 3 is that the natural gas of liquefaction module 2 post liquefaction carries out continuations and cools, after super cooled sect cold-producing medium carries out one stage of compression in super cooled sect compressor 3-1, enter super cooled sect one-level cooler 3-2 to cool, get back to super cooled sect compressor 3-1 after cooling and carry out two-stage compression, enter super cooled sect secondary coolers 3-3 after completing two-stage compression to cool, the pressurized end that cooled cold-producing medium enters super cooled sect turbo-expander 3-6 by super cooled sect level 2 buffering tank 3-5 carries out supercharging, enter super cooled sect three grades of cooler 3-7 again to cool, after cooled cold-producing medium enters and continues cooling in liquefaction stages heat exchanger 2-9, be transmitted back to the expansion entrance of super cooled sect turbo-expander 3-6, cold-producing medium enters super cooled sect heat exchanger 3-8 after expanding in super cooled sect decompressor 3-6, for super cooled sect heat exchanger 3-8 provides cold, cold-producing medium after temperature raises enters liquefaction stages heat exchanger 2-9, super cooled sect compressor 3-1 is come back to by first-level buffer tank 3-10 through the cold-producing medium after heat exchange in liquefaction stages heat exchanger 2-9, completed the circulation of cold module 3.
Wherein, raw natural gas and liquefaction module 2 cold-producing medium adopt independent cooling circulating precooling, liquefaction module 2 and cross cold module 3 and adopt independently-inflatable kind of refrigeration cycle.
When system underload or a set of refrigeration module break down, the method of operation of system can be combined as precooling module 1+ liquefaction module 2+ and cross cold module 3, or precooling module 1+ liquefaction module 2, or precooling module 1+ crosses cold module 3, or liquefaction module 2+ crosses cold module 3, or independent liquefaction module 2, or independently cross cold module 3.
Be described in detail below by the course of work of specific embodiment to the natural gas liquefaction system of of the present utility model pair of swell refrigeration technique.
The natural gas molar constituent adopted in this enforcement is 0.41%N
2+ 89.39%CH
4+ 10.07%C
2h
6+ 0.13%C
3h
8, pressure is 3.9MPa, and temperature is 45.0 DEG C, and flow is 50000Nm
3/ h, cold-producing medium adopts nitrogen, and the concrete steps of the liquefaction flow path of natural gas are as follows:
1) by the natural gas transport precool heat exchanger device 1-1 after purified treatment, by precooling cold-producing medium propane pre-cooling to-34.0 DEG C;
2) will through step 1) cooled natural gas enters liquefaction stages heat exchanger 2-9, enter heavy hydrocarbon separator 2-12 after being cooled to-50 DEG C to be separated, be rejected to the external world by being separated the heavy hydrocarbon that obtains, and be again transported to liquefaction stages heat exchanger 2-9 be cooled to-120 DEG C by being separated the gas phase natural gas obtained;
3) by through step 2) natural gas transport that obtains is cooled to-155 DEG C to super cooled sect heat exchanger 3-8, and pressure reduced to 0.12MPa, and temperature reduces to-158.8 DEG C, obtains liquefied natural gas product, and liquefied natural gas product is transported to LNG storage tank.
4) liquefaction stages nitrogen is pressurized to 2.79MPa through liquefaction stages compressor 2-1 two stages of compression, after the section of being liquefied one-level cooler 2-2 and liquefaction stages secondary coolers 2-3 cools, 3.95MPa is pressurized to through liquefaction stages turbo-expander 2-6, enter current divider 2-8 after the section of being liquefied three grades of cooler 2-7 are cold to shunt, part nitrogen enters precool heat exchanger device 1-1 and cools, be cooled to-34.0 DEG C, another part nitrogen enters in liquefaction stages heat exchanger 2-9 and cools, and is cooled to-52 DEG C; Two parts nitrogen after precooling is after blender 2-10 mixes, enter liquefaction stages turbo-expander 2-6 expansion and be depressurized to 0.72MPa, return liquefaction stages heat exchanger 2-9 after temperature reduces to-115.8 DEG C and cold is provided, and the nitrogen after making own temperature be increased to 34.2 DEG C reenters liquefaction stages compressor 2-1 completes liquefaction stages nitrogen circulation.
5) super cooled sect nitrogen is pressurized to 22.5MPa through super cooled sect compressor 3-1 two stages of compression, after being cooled by super cooled sect one-level cooler 3-2 and super cooled sect secondary coolers 3-3,24.5MPa is pressurized to through super cooled sect turbo-expander 3-6, after being cooled to by super cooled sect three grades of cooler 3-7, entering super cooled sect heat exchanger 3-8 and be cooled to-120 DEG C; Enter super cooled sect turbo-expander 3-6 expansion and be depressurized to 0.72MPa, after temperature reduces to-158.1 DEG C, return super cooled sect heat exchanger 3-8 and liquefaction stages heat exchanger 2-9 provides cold, the nitrogen after temperature is increased to 34.5 DEG C reenters super cooled sect nitrogen compressor 3-1 and completes super cooled sect nitrogen circulation.
The various embodiments described above are only for illustration of the utility model; wherein the structure of each parts, connected mode and manufacture craft etc. all can change to some extent; every equivalents of carrying out on the basis of technical solutions of the utility model and improvement, all should not get rid of outside protection domain of the present utility model.
Claims (7)
1. a natural gas liquefaction system for two swell refrigeration technique, is characterized in that: comprise precooling module, liquefaction module and cross cold module; The gas outlet of described precooling module connects the gas inlet of described liquefaction module, and the gas outlet of described liquefaction module connects the gas inlet of the cold module of described mistake; The cold refrigerant outlet of mistake of the cold module of described mistake connects the cold refrigerant inlet of mistake of described liquefaction module, and the liquefied refrigerant outlet of described liquefaction module connects the liquefied refrigerant entrance of described precooling module.
2. the natural gas liquefaction system of a kind of pair of swell refrigeration technique as claimed in claim 1, it is characterized in that: described precooling module is made up of precool heat exchanger device, described precool heat exchanger device comprises raw material precooling zone gas inlet, precooling zone gas outlet, precooling zone liquefied refrigerant entrance, the outlet of precooling zone liquefied refrigerant, precooling refrigerant inlet and precooling refrigerant outlet; Described precooling zone gas inlet connects outside gas pipeline, described precooling zone gas outlet connects the entrance of described liquefaction module, described precooling zone liquefied refrigerant entrance connects described liquefaction module outlet, described precooling zone liquefied refrigerant outlet connects the entrance in described liquefaction module, described precooling refrigerant inlet connects the outlet of outside precooling refrigeration system PCR, and described precooling refrigerant outlet connects the entrance of described precooling refrigeration system PCR.
3. the natural gas liquefaction system of a kind of pair of swell refrigeration technique as claimed in claim 1, is characterized in that: described liquefaction module comprises liquefaction stages compressor, liquefaction stages one-level cooler, liquefaction stages secondary coolers, liquefaction stages check-valves, liquefaction stages level 2 buffering tank, liquefaction stages turbo-expander, liquefaction stages three grades of coolers, current divider, liquefaction stages heat exchanger, blender, liquefaction stages first-level buffer tank and heavy hydrocarbon separator, wherein, described liquefaction stages compressor is provided with the outlet of liquefaction stages stage compressor entrance, liquefaction stages stage compressor outlet, liquefaction stages split-compressor entrance and liquefaction stages split-compressor, described liquefaction stages turbo-expander is provided with liquefaction stages suction port of compressor, liquefaction stages compressor outlet, liquefaction stages expander inlet and liquefaction stages expander outlet, described liquefaction stages heat exchanger is provided with liquefaction stages first gas inlet, liquefaction stages first gas outlet, liquefaction stages second gas inlet, liquefaction stages second gas outlet, liquefaction stages crosses cold refrigerant inlet, liquefaction stages crosses cold refrigerant outlet, liquefaction stages crosses cold cold-producing medium low-pressure inlet, liquefaction stages crosses cold cold-producing medium low tension outlet, liquefaction stages liquefied refrigerant entrance, liquefaction stages liquefied refrigerant exports, liquefaction stages liquefied refrigerant low-pressure inlet and liquefaction stages liquefied refrigerant low tension outlet, described liquefaction stages stage compressor entrance connects the outlet of described liquefaction stages first-level buffer tank, described liquefaction stages stage compressor outlet connects the entrance of described liquefaction stages one-level cooler, described liquefaction stages split-compressor entrance connects the outlet of described liquefaction stages one-level cooler, and described liquefaction stages split-compressor outlet connects the entrance of described liquefaction stages secondary coolers, the outlet of described liquefaction stages secondary coolers connects the entrance of described liquefaction stages level 2 buffering tank by described liquefaction stages first check-valves, the outlet of described liquefaction stages level 2 buffering tank connects the described liquefaction stages suction port of compressor of described liquefaction stages turbo-expander, the described liquefaction stages compressor outlet of described liquefaction stages turbo-expander connects the entrance of described liquefaction stages three grades of coolers, the outlet of described liquefaction stages three grades of coolers connects the entrance of described current divider, a wherein outlet of described current divider is the liquefied refrigerant high-pressure outlet of described liquefaction module, connect the described precooling zone liquefied refrigerant entrance of described precooling module, another outlet connects the described liquefaction stages liquefied refrigerant entrance of described liquefaction stages heat exchanger, the described liquefaction stages liquefied refrigerant outlet of described liquefaction stages heat exchanger connects the entrance of described blender, the outlet of described blender connects the described liquefaction stages expander inlet of described liquefaction stages turbo-expander, the described liquefaction stages expander outlet of described liquefaction stages turbo-expander connects the described liquefaction stages liquefied refrigerant low-pressure inlet of described liquefaction stages heat exchanger, the described liquefaction stages liquefied refrigerant low tension outlet of described liquefaction stages heat exchanger connects the entrance of described liquefaction stages first-level buffer tank, described liquefaction stages first gas inlet of described liquefaction stages heat exchanger connects the described precooling zone gas outlet of described precooling module, described liquefaction stages first gas outlet of described liquefaction stages heat exchanger connects the entrance of described heavy hydrocarbon separator, a wherein outlet of described heavy hydrocarbon separator is in communication with the outside, and another outlet connects described liquefaction stages second gas inlet of described liquefaction stages heat exchanger, described liquefaction stages second gas outlet of described liquefaction stages heat exchanger connects the described super cooled sect gas inlet of the cold module of described mistake, the described liquefaction stages of described liquefaction stages heat exchanger crosses the cold refrigerant high pressure entrance of mistake that cold refrigerant inlet is described liquefaction module, connect the cold module outlet of described mistake, the described liquefaction stages of described liquefaction stages heat exchanger crosses the cold refrigerant high pressure outlet of mistake that cold refrigerant outlet is described liquefaction module, connects the cold module inlet of described mistake, the described liquefaction stages of described liquefaction stages heat exchanger crosses the cold cold-producing medium low-pressure inlet of mistake that cold cold-producing medium low-pressure inlet is described liquefaction module, connect the outlet of the cold module of described mistake, it is that the mistake cold cold-producing medium low tension outlet of described liquefaction module connects the cold module of described mistake that the described liquefaction stages of described liquefaction stages heat exchanger crosses cold cold-producing medium low tension outlet.
4. the natural gas liquefaction system of a kind of pair of swell refrigeration technique as claimed in claim 2, is characterized in that: described liquefaction module comprises liquefaction stages compressor, liquefaction stages one-level cooler, liquefaction stages secondary coolers, liquefaction stages check-valves, liquefaction stages level 2 buffering tank, liquefaction stages turbo-expander, liquefaction stages three grades of coolers, current divider, liquefaction stages heat exchanger, blender, liquefaction stages first-level buffer tank and heavy hydrocarbon separator, wherein, described liquefaction stages compressor is provided with the outlet of liquefaction stages stage compressor entrance, liquefaction stages stage compressor outlet, liquefaction stages split-compressor entrance and liquefaction stages split-compressor, described liquefaction stages turbo-expander is provided with liquefaction stages suction port of compressor, liquefaction stages compressor outlet, liquefaction stages expander inlet and liquefaction stages expander outlet, described liquefaction stages heat exchanger is provided with liquefaction stages first gas inlet, liquefaction stages first gas outlet, liquefaction stages second gas inlet, liquefaction stages second gas outlet, liquefaction stages crosses cold refrigerant inlet, liquefaction stages crosses cold refrigerant outlet, liquefaction stages crosses cold cold-producing medium low-pressure inlet, liquefaction stages crosses cold cold-producing medium low tension outlet, liquefaction stages liquefied refrigerant entrance, liquefaction stages liquefied refrigerant exports, liquefaction stages liquefied refrigerant low-pressure inlet and liquefaction stages liquefied refrigerant low tension outlet, described liquefaction stages stage compressor entrance connects the outlet of described liquefaction stages first-level buffer tank, described liquefaction stages stage compressor outlet connects the entrance of described liquefaction stages one-level cooler, described liquefaction stages split-compressor entrance connects the outlet of described liquefaction stages one-level cooler, and described liquefaction stages split-compressor outlet connects the entrance of described liquefaction stages secondary coolers, the outlet of described liquefaction stages secondary coolers connects the entrance of described liquefaction stages level 2 buffering tank by described liquefaction stages first check-valves, the outlet of described liquefaction stages level 2 buffering tank connects the described liquefaction stages suction port of compressor of described liquefaction stages turbo-expander, the described liquefaction stages compressor outlet of described liquefaction stages turbo-expander connects the entrance of described liquefaction stages three grades of coolers, the outlet of described liquefaction stages three grades of coolers connects the entrance of described current divider, a wherein outlet of described current divider is the liquefied refrigerant high-pressure outlet of described liquefaction module, connect the described precooling zone liquefied refrigerant entrance of described precooling module, another outlet connects the described liquefaction stages liquefied refrigerant entrance of described liquefaction stages heat exchanger, the described liquefaction stages liquefied refrigerant outlet of described liquefaction stages heat exchanger connects the entrance of described blender, the outlet of described blender connects the described liquefaction stages expander inlet of described liquefaction stages turbo-expander, the described liquefaction stages expander outlet of described liquefaction stages turbo-expander connects the described liquefaction stages liquefied refrigerant low-pressure inlet of described liquefaction stages heat exchanger, the described liquefaction stages liquefied refrigerant low tension outlet of described liquefaction stages heat exchanger connects the entrance of described liquefaction stages first-level buffer tank, described liquefaction stages first gas inlet of described liquefaction stages heat exchanger connects the described precooling zone gas outlet of described precooling module, described liquefaction stages first gas outlet of described liquefaction stages heat exchanger connects the entrance of described heavy hydrocarbon separator, a wherein outlet of described heavy hydrocarbon separator is in communication with the outside, and another outlet connects described liquefaction stages second gas inlet of described liquefaction stages heat exchanger, described liquefaction stages second gas outlet of described liquefaction stages heat exchanger connects the described super cooled sect gas inlet of the cold module of described mistake, the described liquefaction stages of described liquefaction stages heat exchanger crosses the cold refrigerant high pressure entrance of mistake that cold refrigerant inlet is described liquefaction module, connect the cold module outlet of described mistake, the described liquefaction stages of described liquefaction stages heat exchanger crosses the cold refrigerant high pressure outlet of mistake that cold refrigerant outlet is described liquefaction module, connects the cold module inlet of described mistake, the described liquefaction stages of described liquefaction stages heat exchanger crosses the cold cold-producing medium low-pressure inlet of mistake that cold cold-producing medium low-pressure inlet is described liquefaction module, connect the outlet of the cold module of described mistake, it is that the mistake cold cold-producing medium low tension outlet of described liquefaction module connects the cold module of described mistake that the described liquefaction stages of described liquefaction stages heat exchanger crosses cold cold-producing medium low tension outlet.
5. the natural gas liquefaction system of a kind of pair of swell refrigeration technique as claimed in claim 1 or 2 or 3 or 4, is characterized in that: the cold module of described mistake comprises super cooled sect compressor, super cooled sect one-level cooler, super cooled sect secondary coolers, super cooled sect check-valves, super cooled sect level 2 buffering tank, super cooled sect turbo-expander, super cooled sect three grades of coolers, super cooled sect heat exchanger, super cooled sect the 3rd by-pass valve control and super cooled sect first-level buffer tank, wherein, described super cooled sect compressor is provided with the outlet of super cooled sect stage compressor entrance, super cooled sect stage compressor outlet, super cooled sect split-compressor entrance and super cooled sect split-compressor, described super cooled sect turbo-expander is provided with super cooled sect suction port of compressor, super cooled sect compressor outlet, crosses cold refrigerant high pressure entrance and cross cold cold-producing medium low tension outlet, described super cooled sect heat exchanger is provided with super cooled sect gas inlet, super cooled sect gas outlet, super cooled sect crosses cold cold-producing medium low-pressure inlet and super cooled sect crosses cold cold-producing medium low tension outlet, the described super cooled sect stage compressor entrance of described super cooled sect compressor connects the outlet of described super cooled sect first-level buffer tank, the described super cooled sect stage compressor outlet of described super cooled sect compressor connects the entrance of described super cooled sect one-level cooler, the described super cooled sect split-compressor entrance of described super cooled sect compressor connects the outlet of described super cooled sect one-level cooler, the described super cooled sect split-compressor outlet of described super cooled sect compressor connects the entrance of described liquefaction stages secondary coolers, the outlet of described super cooled sect secondary coolers connects the entrance of described super cooled sect level 2 buffering tank by described super cooled sect check-valves, the outlet of described super cooled sect level 2 buffering tank connects the described super cooled sect suction port of compressor of described super cooled sect turbo-expander, the described super cooled sect compressor outlet of described super cooled sect turbo-expander connects the entrance of described super cooled sect three grades of coolers, the described liquefaction stages that the outlet of described super cooled sect three grades of coolers connects described liquefaction module crosses cold refrigerant inlet, the described super cooled sect gas inlet of described super cooled sect heat exchanger is the natural gas high pressure entrance of the cold module of described mistake, connect described liquefaction stages second gas outlet of described liquefaction module, the described super cooled sect gas outlet of described super cooled sect heat exchanger connects LNG storage tank by described super cooled sect the 3rd by-pass valve control, the described mistake cold refrigerant high pressure entrance of described super cooled sect turbo-expander is the cold refrigerant high pressure entrance of mistake of the cold module of described mistake, and the described liquefaction stages connecting described liquefaction module crosses cold refrigerant outlet, the described super cooled sect that the described mistake cold cold-producing medium low tension outlet of described super cooled sect turbo-expander connects described super cooled sect heat exchanger crosses cold cold-producing medium low-pressure inlet, the described super cooled sect of described super cooled sect heat exchanger crosses the cold cold-producing medium low tension outlet of mistake that cold cold-producing medium low tension outlet is the cold module of described mistake, the described liquefaction stages connecting described liquefaction stages heat exchanger crosses cold cold-producing medium low-pressure inlet, and the described liquefaction stages of described liquefaction stages heat exchanger crosses the entrance that cold cold-producing medium low tension outlet connects described super cooled sect first-level buffer tank.
6. the natural gas liquefaction system of a kind of pair of swell refrigeration technique as claimed in claim 1 or 2 or 3 or 4, is characterized in that: described precooling refrigeration system PCR adopts propane, ammonia, carbon dioxide or freon refrigeration system.
7. the natural gas liquefaction system of a kind of pair of swell refrigeration technique as claimed in claim 5, is characterized in that: described precooling refrigeration system PCR adopts propane, ammonia, carbon dioxide or freon refrigeration system.
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| CN104880024A (en) * | 2015-04-16 | 2015-09-02 | 中国海洋石油总公司 | Natural gas liquefying system for double-expansion cooling process |
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| CN106440656B (en) * | 2016-11-02 | 2022-02-15 | 中国寰球工程有限公司 | Carbon dioxide precooling two-stage nitrogen expansion natural gas liquefaction system |
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| US5141543A (en) * | 1991-04-26 | 1992-08-25 | Air Products And Chemicals, Inc. | Use of liquefied natural gas (LNG) coupled with a cold expander to produce liquid nitrogen |
| DE4440407C1 (en) * | 1994-11-11 | 1996-04-04 | Linde Ag | Method for recovering an ethane-rich fraction for replenishing an ethane-containing refrigeration cycle of a method for liquefying a hydrocarbon-rich fraction |
| US6021647A (en) * | 1998-05-22 | 2000-02-08 | Greg E. Ameringer | Ethylene processing using components of natural gas processing |
| CN102504901A (en) * | 2011-11-03 | 2012-06-20 | 苏州市兴鲁空分设备科技发展有限公司 | Method for liquefying natural gas |
| CN103322769B (en) * | 2012-03-20 | 2015-07-08 | 中国海洋石油总公司 | Cascade connecting type liquidizing system of base load type natural gas liquefaction factories |
| CN204705107U (en) * | 2015-04-16 | 2015-10-14 | 中国海洋石油总公司 | The natural gas liquefaction system of a kind of pair of swell refrigeration technique |
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| CN104880024A (en) * | 2015-04-16 | 2015-09-02 | 中国海洋石油总公司 | Natural gas liquefying system for double-expansion cooling process |
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| CN104880024A (en) | 2015-09-02 |
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