CN206504542U - A kind of liquefaction system for liquefied natural gas - Google Patents
A kind of liquefaction system for liquefied natural gas Download PDFInfo
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- CN206504542U CN206504542U CN201621483231.3U CN201621483231U CN206504542U CN 206504542 U CN206504542 U CN 206504542U CN 201621483231 U CN201621483231 U CN 201621483231U CN 206504542 U CN206504542 U CN 206504542U
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Abstract
The utility model discloses a kind of liquefaction system for liquefied natural gas, including blender, First Heat Exchanger, the second heat exchanger, the 3rd heat exchanger, high-temperature level refrigeration compressor set, middle temperature level refrigeration compressor set, low-temperature level throttling valve group, LNG throttlings valve group, LNG storage tank, current divider and gas compressor set.Refrigeration compressor in present patent application, can directly purchase from the refrigeration compressor in general cold field and use, and heat exchanger uses the plate type heat exchanger that general cold field is commonly used, and without specific customization, greatlys save the cost of investment of refrigeration compressor and heat exchanger.In addition, refrigerant is pure material in present patent application, addition is convenient, and only two kinds of refrigerants of high-temperature level and middle temperature level, reduces leakage hidden danger.Traditional special refrigeration process of three-stage type LNG, make the traditional handicraft of two ranks+natural gas compressing into, special installation is become general device, equally without specific customization, so as to reduce cost of investment, simplify control program.
Description
Technical field
The utility model is related to liquefaction liquefied natural gas technical field, more particularly to a kind of liquefaction for liquefied natural gas
System.
Background technology
Conventional lng technology is frequently with MRC (Mixed Refrigerant Cycle, mixed-refrigerant cycle) work
Skill, but have the disadvantage that：Producer or only a few are domestic abroad for the manufacturing technologies such as MRC compressors, MRC heat exchangers and patent control
In producer's hand, its price is high, supporting slow, and is substantially the non-standard de-sign carried out according to user's operating mode.Using setting for MRC techniques
It is standby, due to the mixture that its refrigerant is non-azeotrope, needed after leakage of refrigerant through detected components such as conventional chromatograph mass spectrographs,
Rational proportion is carried out, therefore higher are required to operating personnel.
Traditional cascade type liquefaction natural gas process, energy consumption is low, and refrigerant is pure material, no proportioning problem, but system ratio
MRC complex process is a lot, and one-time investment is also higher than MRC technique, and floor space is also larger.Due to its complexity, its stability
Deng can also be affected.
In addition, almost all of LNG (Liquefied Natural Gas, liquefied natural gas) device fabrication producer all can
The liquefied fraction of equipment is considered in design, the larger liquefied fraction pursued into equipment gas is their starting point, and ignores day
The overall of right gas is rationally utilized.
The utility model is aimed to solve the problem that：
1st, nearly all existing standardized materials in general cold field can be utilized, such as refrigeration compressor, traditional board-like
Heat exchanger, expansion valve etc., significantly reduce one-time investment cost；
2nd, easy to operate using ready-made blocking and modularized equipment, skid degree is high, and automaticity is high, right
The dependence of operating personnel is few；
3rd, refrigerant is pure material, no proportioning problem, reduces the dependence to operating personnel；
Pay attention to the reasonable utilization of natural gas, rather than single liquefied fraction pursued into equipment natural gas.For example can be first sharp
It is used to generate electricity with after the pressure energy and cold energy of natural gas points of a part of natural gas.
Traditional visible accompanying drawing 1 of tandem type LNG Technology, the flow realizes the liquid of natural gas with 9 main heat exchangers
Change, the main heat exchanger of the first main heat exchanger~the 3rd provides cold by a closed propane refrigeration system, make propane it is high, in,
Evaporated under low three pressure, there are three pressures of inspiration(Pi) to obtain three different cryogenic temperatures, i.e. propane refrigeration system.But it is right
Answer, if propane compressor non-specific customization, it is desirable to which the compressors of three different intake and exhaust pressure is realized.
For second refrigerant circulation (four, five, six main heat exchangers of correspondence), constitute one using ethylene refrigerant and close back
Road, if its refrigeration compression system non-specific customization, is also the need for three different ethylene compressors of intake and exhaust pressure and comes real
It is existing.
Equally, for the 3rd refrigerant circulation (correspondence the seven, the eight, nine main heat exchangers), refrigerant group is used as using methane
It is also to need by the different first of three intake and exhaust pressure if its refrigeration compression system non-specific customization into a closed-loop path
Alkane compressor is realized.
On the other hand, it is to employ 4 kinds of different pressures or species in each heat exchanger for main heat exchanger one, two, three
Media for heat exchange, it is necessary to using the special special Heat Exchangers of LNG；Moreover, for main heat exchanger four~nine, it is changed
Although hot device is 3 kinds of medium flow field stocks, at least cold side all employs cryogenic gas and liquid to be evaporated while entering heat exchanger
Design, this LNG dedicated heat exchangers are nor the plate type heat exchanger that uses of general cold field is soluble.
Scheme of the present utility model is the improvement carried out regarding to the issue above to existing liquefied natural gas liquefaction system.
Utility model content
In order to overcome deficiency of the prior art, the utility model provides a kind of liquefaction system for liquefied natural gas,
With refrigeration compressor and heat exchanger without specific customization, the features such as cost of investment is low, stability is good, heat transfer effect is good.
In order to reach above-mentioned utility model purpose, the technical scheme that its technical problem used is solved as follows：
A kind of liquefaction system for liquefied natural gas, including blender, First Heat Exchanger, the second heat exchanger, the 3rd change
Hot device, high-temperature level refrigeration compressor set, middle temperature level refrigeration compressor set, low-temperature level throttling valve group, LNG throttlings valve group, LNG storages
Tank, current divider, gas compressor set, wherein：
Three plume roads are equipped with inside the First Heat Exchanger, the second heat exchanger and the 3rd heat exchanger, are distinguished from top to bottom
For first flow, second flow channel and third flow channel；
The output end of the blender connects the second flow channel of the First Heat Exchanger, the second of the First Heat Exchanger
Road is connected with the second flow channel of the second heat exchanger, and the second flow channel of second heat exchanger is divided into two-way since then：
The second flow channel with the 3rd heat exchanger is sequentially connected all the way, the second flow channel of the 3rd heat exchanger again with institute
State after LNG throttling valve groups are connected and be connected to the LNG storage tank；
Another road through the low-temperature level throttle valve group after be connected with the third flow channel of the 3rd heat exchanger, and successively reverses through
Institute is connected to after first flow, the first flow of the second heat exchanger and the first flow of First Heat Exchanger of 3rd heat exchanger
Current divider is stated, the current divider is separated into two-way output, purifies the laggard of part purge gass for the direct generation of electricity or conduct all the way
Row generates electricity, and another road is connected to the input of the blender again after being connected with the gas compressor set；
The high-temperature level refrigeration compressor set is connected to the third flow channel two ends of the First Heat Exchanger, natural for causing
Gas cools；
The middle temperature level refrigeration compressor set is connected to the third flow channel two ends of second heat exchanger, natural for causing
Gas further cools.
Further, the high-temperature level refrigeration compressor set includes high-temperature level refrigeration compressor, the air-cooled condenser of high-temperature level, the
Cold throttling valve group in cold heat exchanger and first in one high-temperature level throttling valve group, first, wherein：
Two plume roads are provided with described first inside cold heat exchanger；
Cold heat exchanger in cold throttling valve group and first in the high-temperature level refrigeration compressor, the air-cooled condenser of high-temperature level, first
An internal runner carries out closure connection successively, forms the first high-temperature level circulation loop；
It is another runner inside cold heat exchanger in the high-temperature level refrigeration compressor, the air-cooled condenser of high-temperature level, first, first high
Warm level throttling valve group and the third flow channel of First Heat Exchanger carry out closure connection successively, form the second high-temperature level circulation loop.
Further, in addition to the 4th heat exchanger and the first precooled throttling valve group, wherein：
4th heat exchanger is provided with three plume roads, and respectively first flow, second flow channel and the 3rd flow from top to bottom
Road；
4th heat exchanger is arranged between the blender and First Heat Exchanger, and the output end of the blender is through institute
The second flow channel forward direction for stating the 4th heat exchanger is connected to the second flow channel of the First Heat Exchanger, the first of the First Heat Exchanger
First flow Opposite direction connection of the runner through the 4th heat exchanger is to the current divider；
The high-temperature level refrigeration compressor, the air-cooled condenser of high-temperature level, the of the first precooled throttling valve group and the 4th heat exchanger
Three runners carry out closure connection successively, form third high temperature level circulation loop.
Further, the high-temperature level refrigeration compressor set also includes the second high-temperature level throttling valve group and the evaporation of middle temperature level is cold
Condenser, wherein：
It is another runner inside cold heat exchanger in the high-temperature level refrigeration compressor, the air-cooled condenser of high-temperature level, first, second high
Warm level throttling valve group and middle temperature level evaporative condenser carry out closure connection successively, form the 4th high-temperature level circulation loop.
Further, the middle temperature level refrigeration compressor set include middle temperature level refrigeration compressor, the middle air-cooled condenser of temperature level, in
Cold throttling valve group in cold heat exchanger and second in warm level throttling valve group, second, wherein：
Two plume roads are provided with described second inside cold heat exchanger；
Cold throttling valve group in the middle temperature level refrigeration compressor, the middle air-cooled condenser of temperature level, middle temperature level evaporative condenser, second
With second in inside cold heat exchanger a runner carry out closure connection successively, form the first middle temperature level circulation loop；
In the middle temperature level refrigeration compressor, the middle air-cooled condenser of temperature level, middle temperature level evaporative condenser, second in cold heat exchanger
The third flow channel of another runner in portion, middle temperature level throttling valve group and the second heat exchanger carries out closure connection successively, forms the second middle temperature
Level circulation loop.
Further, in addition to the 5th heat exchanger and the second precooled throttling valve group, wherein：
5th heat exchanger is provided with three plume roads, and respectively first flow, second flow channel and the 3rd flow from top to bottom
Road；
5th heat exchanger is arranged between the First Heat Exchanger and the second heat exchanger, and the of the First Heat Exchanger
Second flow channel forward direction of two runners through the 5th heat exchanger is connected to the second flow channel of second heat exchanger, and described second changes
First flow Opposite direction connection of the first flow of hot device through the 5th heat exchanger to the First Heat Exchanger second flow channel；
The middle temperature level refrigeration compressor, the middle air-cooled condenser of temperature level, middle temperature level evaporative condenser, the second precooled throttling valve group
Closure connection is carried out successively with the 5th heat exchanger third flow channel, forms the 3rd middle temperature level circulation loop.
It is preferred that, the First Heat Exchanger, the second heat exchanger, the 3rd heat exchanger, the 4th heat exchanger and/or the 5th heat exchanger
For brazing plate type heat exchanger.
Further, the high-temperature level refrigeration compressor set uses R404A, R290, R507A, R744 or R22 refrigerant.
It is preferred that, the high-temperature level refrigeration compressor set uses R404A, R507A refrigerant.
Further, the middle temperature level refrigeration compressor set uses R23, R508B or R1150 refrigerant.
It is preferred that, the middle temperature level refrigeration compressor set uses R23 refrigerants.
The utility model is allowed to compared with prior art, have the following advantages that and accumulate due to using above technical scheme
Pole effect：
(1) refrigeration compressor in general cold field, is substantially all with charge air cooler (or being economizer), refrigeration compressor standard
Change is designed to that cold can be provided under two evaporating temperatures, i.e., be all fixed with two pressures of inspiration(Pi) (middle pressure pressure per compressor
Power and low pressure), so the refrigeration compressor in present patent application, can directly be adopted from the refrigeration compressor in general cold field
Purchase is used, it is not necessary to the particular design refrigeration machine as traditional handicraft, or each circulation is greatlyd save using 3 refrigeration machines
The cost of investment of refrigeration machine.
(2) the conventional plate type heat exchanger in general cold field, typically can be designed to three runners, due to plate-type heat-exchange now
The progress of device manufacturing technology, its universal pressure-bearing can receive 6.4MPa, therefore fully meet requirements of the pressure in LNG liquefaction process and want
Ask, it is not necessary to using the LNG heat exchangers specially designed as traditional handicraft, greatly save the cost of investment of heat exchanger.
(3) traditional special refrigeration process of three-stage type LNG, the traditional handicraft of two ranks+natural gas compressing is made into, it is special to make
Equipment becomes general device, and traditional implements relatively difficult methane refrigeration cycle, with highly developed natural of technology
Air compressor group is substituted, and improves stability, and gas compressor set completely can be with Customization Module, unlike methane refrigerant is followed
Loop system, either from methane refrigeration compressor, or refrigeration system other auxiliaries, will specific customization, so as to reduce
Investment, simplifies control, simplifies.
(4) refrigerant in present patent application is pure material, and addition is convenient, and only two kinds of systems of high-temperature level and middle temperature level
Cryogen, reduces leakage hidden danger.And traditional MRC techniques are mixed working fluid, complexity is matched after leakage, traditional cascade refrigeration is also needed
There are three kinds of refrigerants, and refrigeration compressor is more, leak point is more.
(5) tradition MRC techniques are to be customized according to feed gas composition and pressure, when feed gas composition and pressure generation change
Afterwards, mixed working fluid and special LNG heat exchangers are all difficult to match former design, therefore yield can be drastically reduced, and this technique is using general
The superposition type technique in cold field, refrigeration interval can keep good Energy Efficiency Ratio interior in a big way.Heat exchanger is also using tradition
The plate type heat exchanger in general cold field, heat transfer effect can keep more preferable adaptability through a wide range of checking.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the utility model embodiment, required in being described below to embodiment
The accompanying drawing used is briefly described.It is clear that drawings in the following description are only some embodiments of the present utility model,
For those skilled in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.In accompanying drawing：
Fig. 1 is the liquefaction system structure chart of cascade type liquefaction natural gas in the prior art；
Fig. 2 is a kind of overall structure diagram of liquefaction system for liquefied natural gas in the utility model.
【Primary symbols explanation】
1- blenders；
2- First Heat Exchangers；
The heat exchangers of 3- second；
The heat exchangers of 4- the 3rd；
5- high-temperature level refrigeration compressor sets；
51- high-temperature level refrigeration compressors；
The air-cooled condenser of 52- high-temperature levels；
The high-temperature levels of 53- first throttling valve group；
Cold heat exchanger in 54- first；
Cold throttling valve group in 55- first；
56- the first precooled throttling valve groups；
The high-temperature levels of 57- second throttling valve group；
The middle temperature level refrigeration compressor sets of 6-；
The middle temperature level evaporative condensers of 61-；
The middle temperature level refrigeration compressors of 62-；
The middle air-cooled condensers of temperature level of 63-；
The middle temperature level throttling valve groups of 64-；
Cold heat exchanger in 65- second；
Cold throttling valve group in 66- second；
67- the second precooled throttling valve groups；
7- low-temperature levels throttling valve group；
8-LNG throttling valve groups；
9-LNG storage tanks；
10- current dividers；
11- gas compressor sets；
The heat exchangers of 12- the 4th；
The heat exchangers of 13- the 5th.
Embodiment
Below with reference to accompanying drawing of the present utility model, the technical scheme in the utility model embodiment is carried out clear, complete
Whole description and discussion, it is clear that as described herein is only a part of example of the present utility model, is not whole realities
Example, based on the embodiment in the utility model, those of ordinary skill in the art institute on the premise of creative work is not made
The every other embodiment obtained, belongs to protection domain of the present utility model.
As shown in Fig. 2 the utility model discloses a kind of liquefaction system for liquefied natural gas, including blender 1,
It is one heat exchanger 2, the second heat exchanger 3, the 3rd heat exchanger 4, high-temperature level refrigeration compressor set 5, middle temperature level refrigeration compressor set 6, low
Warm level throttling valve group 7, LNG throttlings valve group 8, LNG storage tank 9, current divider 10, gas compressor set 11, wherein：
Three plume roads are equipped with inside the First Heat Exchanger 2, the second heat exchanger 3 and the 3rd heat exchanger 4, are divided from top to bottom
Wei not first flow, second flow channel and third flow channel；
The output end of the blender 1 connects the second flow channel of the First Heat Exchanger 2, and the of the First Heat Exchanger 2
Two runners are connected with the second flow channel of the second heat exchanger 3, and the second flow channel of second heat exchanger 3 is divided into two-way since then：
The second flow channel with the 3rd heat exchanger 4 is sequentially connected all the way, the second flow channel of the 3rd heat exchanger 4 again with
The LNG throttlings valve group 8 is connected to the LNG storage tank 9 after being connected；
Another road is connected after low-temperature level throttling valve group 7 with the third flow channel of the 3rd heat exchanger 4, and reversely passes through successively
Connect after the first flow, the first flow of the second heat exchanger 3 and the first flow of First Heat Exchanger 2 of crossing the 3rd heat exchanger 4
The current divider 10 is connected to, the current divider 10 is separated into two-way output, is blown all the way for the direct generation of electricity or as purification part
Generated electricity after scavenging, another road is connected to the input of the blender 1 again after being connected with the gas compressor set 11；
The high-temperature level refrigeration compressor set 5 is connected to the third flow channel two ends of the First Heat Exchanger 2, for causing day
Right gas cooling；
The middle temperature level refrigeration compressor set 6 is connected to the third flow channel two ends of second heat exchanger 3, for causing day
Right gas further cools.
In specific embodiment, it is air-cooled that the high-temperature level refrigeration compressor set 5 includes high-temperature level refrigeration compressor 51, high-temperature level
Cold throttling valve group 55 in cold heat exchanger 54 and first in condenser 52, the first high-temperature level throttling valve group 53, first, wherein：
The inside of cold heat exchanger 54 is provided with two plume roads in described first；
It is cold in cold throttling valve group 55 and first in the air-cooled condenser 52, first of the high-temperature level refrigeration compressor 51, high-temperature level
One runner of the inside of heat exchanger 54 carries out closure connection successively, forms the first high-temperature level circulation loop；
Another runner in the inside of cold heat exchanger 54 in the air-cooled condenser 52, first of the high-temperature level refrigeration compressor 51, high-temperature level,
First high-temperature level throttling valve group 53 and the third flow channel of First Heat Exchanger 2 carry out closure connection successively, form the second high-temperature level and follow
Loop back path.
In preferred embodiment, liquefaction system also includes the 4th heat exchanger 12 and the first precooled throttling valve group 56, wherein：
4th heat exchanger 12 is provided with three plume roads, from top to bottom respectively first flow, second flow channel and the 3rd
Runner；
4th heat exchanger 12 is arranged between the blender 1 and First Heat Exchanger 2, the output of the blender 1
Second flow channel forward direction of the end through the 4th heat exchanger 12 is connected to the second flow channel of the First Heat Exchanger 2, and described first changes
First flow Opposite direction connection of the first flow of hot device 2 through the 4th heat exchanger 12 is to the current divider 10；
The air-cooled condenser 52 of the high-temperature level refrigeration compressor 51, high-temperature level, the first precooled throttling valve group 56 and the 4th heat exchange
The third flow channel of device 12 carries out closure connection successively, forms third high temperature level circulation loop.
Further, the high-temperature level refrigeration compressor set 5 also includes the second high-temperature level throttling valve group 57 and middle temperature level is steamed
Feel cold condenser 61, wherein：
Another runner in the inside of cold heat exchanger 54 in the air-cooled condenser 52, first of the high-temperature level refrigeration compressor 51, high-temperature level,
Second high-temperature level throttling valve group 57 and middle temperature level evaporative condenser 61 carry out closure connection successively, form the 4th high-temperature level and are recycled back to
Road.
In specific embodiment, it is air-cooled that the middle temperature level refrigeration compressor set 6 includes middle temperature level refrigeration compressor 62, middle temperature level
Cold throttling valve group 66 in cold heat exchanger 65 and second in condenser 63, middle temperature level throttling valve group 64, second, wherein：
The inside of cold heat exchanger 65 is provided with two plume roads in described second；
Cold section in the middle temperature level refrigeration compressor 62, the air-cooled condenser 63 of middle temperature level, middle temperature level evaporative condenser 61, second
One runner of the inside of cold heat exchanger 65 carries out closure connection successively in stream valve group 66 and second, forms the first middle temperature level circulation loop；
It is cold in the middle temperature level refrigeration compressor 62, the air-cooled condenser 63 of middle temperature level, middle temperature level evaporative condenser 61, second to change
Another runner in the hot inside of device 65, the third flow channel of the middle temperature level throttling heat exchanger 3 of valve group 64 and second carry out closure connection, shape successively
Into the second middle temperature level circulation loop.
In preferred embodiment, liquefaction system also includes the 5th heat exchanger 13 and the second precooled throttling valve group 67, wherein：
5th heat exchanger 13 is provided with three plume roads, from top to bottom respectively first flow, second flow channel and the 3rd
Runner；
5th heat exchanger 13 is arranged between the heat exchanger 3 of First Heat Exchanger 2 and second, the First Heat Exchanger
Second flow channel forward direction of 2 second flow channel through the 5th heat exchanger 13 is connected to the second flow channel of second heat exchanger 3, institute
First flow Opposite direction connection of the first flow through the 5th heat exchanger 13 of the second heat exchanger 3 is stated to the First Heat Exchanger 2
Second flow channel；
The middle temperature level refrigeration compressor 62, the air-cooled condenser 63 of middle temperature level, middle temperature level evaporative condenser 61, the second precooling section
Stream valve group 67 and the third flow channel of the 5th heat exchanger 13 carry out closure connection successively, form the 3rd middle temperature level circulation loop.
It is preferred that, the First Heat Exchanger 2, the second heat exchanger 3, the 3rd heat exchanger 4, the 4th heat exchanger 12 and/or the 5th
Heat exchanger 13 is brazing plate type heat exchanger.
In the present embodiment, the high-temperature level refrigeration compressor set is freezed using R404A, R290, R507A, R744 or R22
Agent.It is preferred that, the high-temperature level refrigeration compressor set uses R404A, R507A refrigerant.
In the present embodiment, the middle temperature level refrigeration compressor set uses R23, R508B or R1150 refrigerant.It is preferred that, institute
Middle temperature level refrigeration compressor set is stated using R23 refrigerants.
Concrete technology flow process：
First, the natural gas by pressure between 2.5MPa~6.0MPa and after the purification such as desulfurization, decarburization, dehydration exists
Enter the 4th heat exchanger 12 after the gas mixing discharged in blender 1 with gas compressor set 11, the 4th heat exchanger 12 is by height
Third high temperature level circulation loop in warm level refrigeration compressor set 51 provides cold, it is cooled to 10 after the 4th heat exchanger 12~-
After 15 DEG C, First Heat Exchanger 2 is entered back into, First Heat Exchanger 2 is recycled back to by the second high-temperature level in high-temperature level refrigeration compressor set
Road provides cold, and -15~-35 DEG C are cooled to after First Heat Exchanger 2；The 4th circulation loop in high-temperature level refrigeration compressor set
By middle temperature level evaporative condenser 61, for the middle temperature level refrigerant of condensing high pressure, folding type cooling system is constituted with middle temperature level.
Secondly, the refrigerant of pressure and low pressure during high-temperature level refrigeration compressor 51 is sucked, the high temperature and high pressure gas of discharge are in height
Condensed in the warm air-cooled condenser 52 of level, be divided into three parts：
Part of refrigerant passes through the reducing pressure by regulating flow of the first precooled throttling valve group 56 into the liquid of medium temperature and medium pressure, then the 4th
Evaporated in heat exchanger 12, exchanged heat with natural gas, 10~-15 DEG C are cooled to after the 4th heat exchanger 12；
Another part refrigerant passes through the cold throttling reducing pressure by regulating flow of valve group 55 in first into the liquid of medium temperature and medium pressure, and first
The heat of Part III high-pressure refrigerant is absorbed in middle cold heat exchanger 54 makes high-pressure refrigerant further be subcooled；
From the 4th heat exchanger 12 come out middle compression refrigerant with from first cold heat exchanger 54 come out middle compression refrigerant mix
The middle pressure return gas channel of high-temperature level refrigeration compressor 51 is returned to after conjunction, SAPMAC method is suppressed in completion.
The Part III high-pressure refrigerant come out from the air-cooled condenser 52 of high-temperature level, through the further mistake of cold heat exchanger 54 in first
It is divided into two strands after cold, makes the liquid that refrigerant becomes low-temp low-pressure after a part of throttling throttling of valve group 53 through the first high-temperature level, so
Enter the heat that natural gas is absorbed in First Heat Exchanger 2 afterwards, -15~-35 DEG C are cooled to after First Heat Exchanger 2, is then become
The gas of low pressure；
After another part refrigerant after being subcooled through cold heat exchanger in first 54 throttles through the second high-temperature level throttling valve group 57
Become the liquid of low-temp low-pressure, subsequently into the middle temperature level evaporative condenser 61 in middle temperature level refrigeration compressor set 6, absorb middle temperature
After the heat of level refrigerant, become low-pressure gas；
After above-mentioned two groups of low-pressure gases mixing, the low pressure return gas channel of high-temperature level refrigeration compressor 51 is returned to, low pressure is completed
The circulation of level refrigerant.
Equally, the middle temperature level refrigerant of pressure and low pressure, the HTHP gas of discharge during middle temperature level refrigeration compressor 62 is sucked
Body is pre- in middle temperature level forced air cooler 63 to be cooled to 30~60 DEG C, and is condensed in middle temperature level evaporative condenser 61, is then divided into three
Part：
Part of refrigerant passes through the reducing pressure by regulating flow of the second precooled throttling valve group 67 into the liquid of medium temperature and medium pressure, then the 5th
Evaporated in heat exchanger 13, with heat exchange gas, -35~-55 DEG C are cooled to after the 5th heat exchanger 13；
Another part refrigerant passes through the cold throttling reducing pressure by regulating flow of valve group 66 in second into the liquid of medium temperature and medium pressure, and second
The heat of Part III high-pressure refrigerant is absorbed in middle cold heat exchanger 65 makes high-pressure refrigerant further be subcooled；
From the 5th heat exchanger 13 come out middle compression refrigerant with from second cold heat exchanger 65 come out middle compression refrigerant mix
The middle pressure return gas channel of middle temperature level refrigeration compressor 62 is returned to after conjunction, SAPMAC method is suppressed in completion.
The therefrom Part III high-pressure refrigerant of warm level evaporative condenser 61 out, through cold heat exchanger 65 in second, passes through
The liquid that middle temperature level throttling valve group 64 makes refrigerant become low-temp low-pressure after throttling, subsequently into absorbing day in the second heat exchanger 3
The heat of right gas, is cooled to -55~-110 DEG C after the second heat exchanger 3, then becomes the gas of low pressure, returns to middle temperature level refrigeration
The low pressure return gas channel of compressor 62, completes the low-pressure stage refrigerant circulation of middle temperature level compressor.
Again, the natural gas for being condensed to -55~-110 DEG C come out from the second heat exchanger 3, is divided into two strands, a part is entered
Enter the 3rd heat exchanger 4, -110~-140 DEG C are further cooled in the 3rd heat exchanger 4；A part is through low-temperature level throttling valve group
7, become the natural gas liquids of low-temp low-pressure after throttling as refrigerant, and in the 3rd heat exchanger 4 absorb natural gas heat,
The natural gas of main flow is set further to be subcooled.
Then, the natural gas of the main flow come out from the 3rd heat exchanger 4, then after the LNG throttling decompressions of valve group 8, flow into LNG
Storage tank 9 is stored, and the flash steam (BOG) discharged in LNG storage tank 9 is used to generating electricity or entering gas compressor set after cold recovery
11 participate in circulating again.
From the 3rd heat exchanger 4 come out the natural gas as refrigerant, by after absorption heat evaporation become gas, then by
Step passes through the 3rd heat exchanger 4, the second heat exchanger 3, the 5th heat exchanger 13, the heat exchanger 12 of First Heat Exchanger 2 and the 4th, and cold is whole
Temperature also returns to substantially 0 DEG C or so after recovery, is then divided into two strands, one as cleaning system purge gass or gas electricity generator
The energy；Another stock is directly entered gas compressor set 11, is boosted in gas compressor set 11 natural after purification
The inlet pressure of gas, is again introduced into circulation after being mixed with the natural gas after purification.
It is described above, only the utility model preferably embodiment, but protection domain of the present utility model is not
This is confined to, any one skilled in the art can readily occur in the technical scope that the utility model is disclosed
Change or replacement, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should
It is defined by scope of the claims.
Claims (11)
1. a kind of liquefaction system for liquefied natural gas, it is characterised in that including blender, First Heat Exchanger, the second heat exchange
Device, the 3rd heat exchanger, high-temperature level refrigeration compressor set, middle temperature level refrigeration compressor set, low-temperature level throttling valve group, LNG choke valves
Group, LNG storage tank, current divider and gas compressor set, wherein：
Three plume roads are equipped with inside the First Heat Exchanger, the second heat exchanger and the 3rd heat exchanger, from top to bottom respectively
One runner, second flow channel and third flow channel；
The output end of the blender connects the second flow channel of the First Heat Exchanger, the second flow channel of the First Heat Exchanger with
The second flow channel of second heat exchanger is connected, and the second flow channel of second heat exchanger is divided into two-way since then：
The second flow channel with the 3rd heat exchanger is sequentially connected all the way, the second flow channel of the 3rd heat exchanger again with it is described
LNG throttling valve groups are connected to the LNG storage tank after being connected；
Another road is connected after low-temperature level throttling valve group with the third flow channel of the 3rd heat exchanger, and successively reverses through described
Described point is connected to after first flow, the first flow of the second heat exchanger and the first flow of First Heat Exchanger of 3rd heat exchanger
Flow device, the current divider be separated into two-way output, all the way for the direct generation of electricity or as purification part purge gass after sent out
Electricity, another road is connected to the input of the blender again after being connected with the gas compressor set；
The high-temperature level refrigeration compressor set is connected to the third flow channel two ends of the First Heat Exchanger, for causing natural gas to drop
Temperature；
The middle temperature level refrigeration compressor set is connected to the third flow channel two ends of second heat exchanger, for causing natural gas to enter
One step cools.
2. a kind of liquefaction system for liquefied natural gas according to claim 1, it is characterised in that the high-temperature level system
Cold compression unit includes cold heat exchange in high-temperature level refrigeration compressor, the air-cooled condenser of high-temperature level, the first high-temperature level throttling valve group, first
Cold throttling valve group in device and first, wherein：
Two plume roads are provided with described first inside cold heat exchanger；
In the high-temperature level refrigeration compressor, the air-cooled condenser of high-temperature level, first in cold throttling valve group and first inside cold heat exchanger
One runner carries out closure connection successively, forms the first high-temperature level circulation loop；
Another runner in cold heat exchanger inside, the first high-temperature level in the high-temperature level refrigeration compressor, the air-cooled condenser of high-temperature level, first
Throttling valve group and the third flow channel of First Heat Exchanger carry out closure connection successively, form the second high-temperature level circulation loop.
3. a kind of liquefaction system for liquefied natural gas according to claim 2, it is characterised in that also changed including the 4th
Hot device and the first precooled throttling valve group, wherein：
4th heat exchanger is provided with three plume roads, from top to bottom respectively first flow, second flow channel and third flow channel；
4th heat exchanger is arranged between the blender and First Heat Exchanger, and the output end of the blender is through described
The second flow channel forward direction of four heat exchangers is connected to the second flow channel of the First Heat Exchanger, the first flow of the First Heat Exchanger
First flow Opposite direction connection through the 4th heat exchanger is to the current divider；
The high-temperature level refrigeration compressor, the air-cooled condenser of high-temperature level, the 3rd stream of the first precooled throttling valve group and the 4th heat exchanger
Road carries out closure connection successively, forms third high temperature level circulation loop.
4. a kind of liquefaction system for liquefied natural gas according to Claims 2 or 3, it is characterised in that the high temperature
Level refrigeration compressor set also includes the second high-temperature level throttling valve group and middle temperature level evaporative condenser, wherein：
Another runner in cold heat exchanger inside, the second high-temperature level in the high-temperature level refrigeration compressor, the air-cooled condenser of high-temperature level, first
Throttling valve group and middle temperature level evaporative condenser carry out closure connection successively, form the 4th high-temperature level circulation loop.
5. a kind of liquefaction system for liquefied natural gas according to claim 4, it is characterised in that the middle temperature level system
Cold compression unit include middle temperature level refrigeration compressor, the middle air-cooled condenser of temperature level, middle temperature level throttling valve group, in second cold heat exchanger and
Cold throttling valve group in second, wherein：
Two plume roads are provided with described second inside cold heat exchanger；
Cold throttling valve group and the in the middle temperature level refrigeration compressor, the middle air-cooled condenser of temperature level, middle temperature level evaporative condenser, second
A runner carries out closure connection successively inside cold heat exchanger in two, forms the first middle temperature level circulation loop；
It is another inside cold heat exchanger in the middle temperature level refrigeration compressor, the middle air-cooled condenser of temperature level, middle temperature level evaporative condenser, second
The third flow channel of one runner, middle temperature level throttling valve group and the second heat exchanger carries out closure connection successively, forms the second middle temperature level and follows
Loop back path.
6. a kind of liquefaction system for liquefied natural gas according to claim 5, it is characterised in that also changed including the 5th
Hot device and the second precooled throttling valve group, wherein：
5th heat exchanger is provided with three plume roads, from top to bottom respectively first flow, second flow channel and third flow channel；
5th heat exchanger is arranged between the First Heat Exchanger and the second heat exchanger, the second of the First Heat Exchanger
Second flow channel forward direction of the road through the 5th heat exchanger is connected to the second flow channel of second heat exchanger, second heat exchanger
First flow Opposite direction connection of the first flow through the 5th heat exchanger to the First Heat Exchanger second flow channel；
The middle temperature level refrigeration compressor, the middle air-cooled condenser of temperature level, middle temperature level evaporative condenser, the second precooled throttling valve group and
Five heat exchanger third flow channels carry out closure connection successively, form the 3rd middle temperature level circulation loop.
7. a kind of liquefaction system for liquefied natural gas according to claim 6, it is characterised in that first heat exchange
Device, the second heat exchanger, the 3rd heat exchanger, the 4th heat exchanger and/or the 5th heat exchanger are brazing plate type heat exchanger.
8. a kind of liquefaction system for liquefied natural gas according to claim 1, it is characterised in that the high-temperature level system
Cold compression unit uses R404A, R290, R507A, R744 or R22 refrigerant.
9. a kind of liquefaction system for liquefied natural gas according to claim 8, it is characterised in that the high-temperature level system
Cold compression unit uses R404A, R507A refrigerant.
10. a kind of liquefaction system for liquefied natural gas according to claim 1, it is characterised in that the middle temperature level
Refrigeration compressor set uses R23, R508B or R1150 refrigerant.
11. a kind of liquefaction system for liquefied natural gas according to claim 10, it is characterised in that the middle temperature level
Refrigeration compressor set uses R23 refrigerants.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621483231.3U CN206504542U (en) | 2016-12-30 | 2016-12-30 | A kind of liquefaction system for liquefied natural gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621483231.3U CN206504542U (en) | 2016-12-30 | 2016-12-30 | A kind of liquefaction system for liquefied natural gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106595220A (en) * | 2016-12-30 | 2017-04-26 | 上海聚宸新能源科技有限公司 | Liquefying system and liquefying method for liquefied natural gas |
| CN110715504A (en) * | 2019-08-28 | 2020-01-21 | 中国科学院工程热物理研究所 | Residual pressure power generation liquefaction system of high-pressure natural gas |
| CN111854322A (en) * | 2020-07-14 | 2020-10-30 | 西安交通大学 | Natural gas liquefaction system based on propane and isobutane mix precooling |
-
2016
- 2016-12-30 CN CN201621483231.3U patent/CN206504542U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106595220A (en) * | 2016-12-30 | 2017-04-26 | 上海聚宸新能源科技有限公司 | Liquefying system and liquefying method for liquefied natural gas |
| CN106595220B (en) * | 2016-12-30 | 2022-07-12 | 上海聚宸新能源科技有限公司 | Liquefaction system for liquefying natural gas and liquefaction method thereof |
| CN110715504A (en) * | 2019-08-28 | 2020-01-21 | 中国科学院工程热物理研究所 | Residual pressure power generation liquefaction system of high-pressure natural gas |
| CN111854322A (en) * | 2020-07-14 | 2020-10-30 | 西安交通大学 | Natural gas liquefaction system based on propane and isobutane mix precooling |
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