CN103162511A - Natural gas constant-pressure liquefaction device - Google Patents
Natural gas constant-pressure liquefaction device Download PDFInfo
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- CN103162511A CN103162511A CN2013100309487A CN201310030948A CN103162511A CN 103162511 A CN103162511 A CN 103162511A CN 2013100309487 A CN2013100309487 A CN 2013100309487A CN 201310030948 A CN201310030948 A CN 201310030948A CN 103162511 A CN103162511 A CN 103162511A
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Abstract
The invention relates to a natural gas constant-pressure liquefaction device. A Rankine cycle system which is arranged at a low-temperature end and similar to a thermal power cycle device is used in the natural gas constant-pressure liquefaction device. A low-temperature pump is adopted to input power, and the natural gas constant-pressure liquefaction device is cooled through refrigerants in a compensating mode so as to achieve constant-pressure liquefaction of natural gas. On the premise of the same refrigerating capacity, compared with a traditional advanced set, the natural gas constant-pressure liquefaction device saves energy by more than 30%, and is a breakthrough of a traditional natural gas liquefaction technology, and is obvious in economic, social and environment protection benefits.
Description
Technical field
The present invention relates to the isobaric liquefying plant of a kind of natural gas, specifically belong to the cryogenic refrigeration technical field.
Background technology
Natural gas is a kind of fossil energy of high-quality cleaning, has very consequence in national economy.The liquefaction of natural gas and storage are the key technologies of its exploitation, have formed an industry at home and abroad, and be annual with average 8% speed increment, in the China energy consumption structure, increases very fast in recent years.LNG Technology has become a high-tech technology, is subject to the attention of more and more scientific and technical subjects.
Expect the middle of this century, if consume natural gas 5000*10 with China
8m
3/ a, wherein imported L NG1000*10
8m
3/ a meter (being equivalent to the present import volume of Japan), it is 257*10 that cold energ is amounted to electric energy
8KWh/a is equivalent to a 600*10
4The annual electricity generating capacity in kW power station.Therefore how to make LNG realize the breakthrough of the each side such as technology, administrative mechanism, the market promotion, strive making the energy consumption of decrease LNG, obtaining huge energy-conservation and economic benefit simultaneously, promotion comprises that sky divides, the fast development of the large-scale cold energy industrial chain of coal oxygen-rich gasification, to for China's round Realization circular form economy and economizing economy contribute, be worth deeply thinking.Simultaneously, the fast development of China's economic and Model Transformation have determined to utilize on a large scale the imperative of LNG, and grand user market is provided.
The liquefaction flow path of tradition natural gas mainly contains following three kinds:
1, Cascade (also claiming stepwise liquefaction flow path, superposition type liquefaction flow path or cascade evaporation condensation liquefaction flow process), be mainly used in the Basicloadtype natural gas liquefaction device;
2, mix refrigerant liquefaction flow path: i.e. so-called MRC liquefaction flow path, MRC is the hydrocarbon with C1 to C5, and N
2Be working medium Deng the multicomponent mix refrigerant more than five kinds, carry out the refrigerating capacity that condensation step by step, evaporation, throttling expansion obtain the different temperatures level, to reach the progressively purpose of cooling and liquefied natural gas.MRC had both reached the purpose of similar Cascade, and the shortcoming that has overcome its system complex is arranged.Since the eighties in 20th century, for the Basicloadtype natural gas liquefaction device, newly-built Basicloadtype natural gas liquefaction flow process with extending almost adopts propane pre-cooling mix refrigerant liquefaction flow path without any exception;
3, with the liquefaction flow path of decompressor: Expander-Cycle, refer to utilize the cold-producing medium Cloud's circulation in turbo-expander again, realize the flow process of natural gas liquefaction.When gas expands in decompressor and does work, reduce temperature and also reclaim merit.According to the difference of cold-producing medium, can be divided into nitrogen expansion liquefaction flow path and natural gas expansion liquefaction flow path.The advantage of this class flow process is: (1) flow process is simple, flexible adjustment, reliable operation, easily start, easy to operate, easy to maintenance; When (2) making working medium with natural gas itself, can save the expense of special production, transportation, accumulating refrigerant.Shortcoming is: the air-flow of (1) feeder needs whole depth dryings; (2) return pressure is low, and heat exchange area is large, equipment metal input amount is large; (3) be subjected to what restriction of low-voltage customer; (4) liquefied fraction is low, and as recirculation, after increasing recycle compressor, power consumption increases greatly.Due to fairly simple with the operation of the liquefaction flow path of decompressor, invest moderately, be specially adapted to the less peak regulation type natural gas liquefaction device of liquefying power.
Accompanying drawing 1 is tandem type natural gas liquefaction schematic flow sheet.
Accompanying drawing 2 is APCI propane pre-cooling mix refrigerant liquefaction flow path schematic diagrames.
Accompanying drawing 3 is natural gas expansion liquefaction flow paths, in Fig. 3: the 1-dehydrating agent, 2-carbon dioxide removal tower, the 3-water cooler, 4-returns to air compressor, and 5,6, the 7-heat exchanger, 8-subcooler, 9-storage tank, 10-decompressor, 11-compressor.
Accompanying drawing 4 is nitrogen expansion liquefaction flow paths, in Fig. 4: 1-pretreatment unit, 2,4, the 5-heat exchanger, 3-heavy hydrocarbon separator, 6-nitrogen stripper, 7-turbo-expander, 8-nitrogen-methane separation tower, 9-recycle compressor.
Accompanying drawing 5 is with the natural gas of the propane pre-cooling liquefaction schematic flow sheet that expands, in Fig. 5: 1,3,5,6, the 7-heat exchanger, 2,4-propane heat exchanger, 8-water cooler, 9-compressor, 10-brake compressor, 12,13, the 14-gas-liquid separator.
The main theoretical basis of above-mentioned traditional natural gas liquefaction flow scheme design is thermodynamics, namely adopt with the contrary cycle analysis gas deliquescence process in the Kano of the temperature difference, the economic index of circulation is coefficient of refrigerating performance, the ratio of the income that obtains exactly and the cost that expends, and with atmospheric temperature T
0With temperature be T
CAll kind of refrigeration cycle between low-temperature heat source (as freezer), with the coefficient of refrigerating performance of reverse Carnot cycle for the highest:
ε in following formula
cBe coefficient of refrigerating performance, q
2Be the refrigerating capacity of circulation, w
0Be the net work that circulates and consume.
Actual cycle efficient adopts the coefficient of refrigerating performance of actual cycle and the ratio of theoretical circulation coefficient to be described usually, but its theoretical foundation is with the contrary circulation in Kano, process of refrigerastion to be carried out cycle analysis.
In fact, the Kano is in the paper of " about thermodynamic opinion ", and the conclusion that draws is: " all heat engines of working between the constant temperature thermal source of two different temperatures, with the efficient of reversible heat engine for the highest." namely being referred to as Carnot's theorem by the descendant, the thermal efficiency that arranges the Carnot cycle that draws by the desirable equation of gas state is:
The temperature T of the high temperature heat source in formula (2)
1With the temperature of low-temperature heat source be T
2All higher than atmospheric temperature T
0, and can draw following some important conclusion:
1) thermal efficiency of Carnot cycle only is decided by the temperature of high temperature heat source and low-temperature heat source, and namely the temperature during the working medium heat absorption and release, improve T
1And T
2, can improve the thermal efficiency.
2) thermal efficiency of Carnot cycle can only must not equal 1 less than 1, because T
1=∞ or T
2=0 all can not realize.In other words, though in cycle engine in the ideal case, also heat energy all can not be converted into mechanical energy, the thermal efficiency is certainly more impossible greater than 1.
3) work as T
1=T
2The time, thermal efficiency of cycle equals 0, it shows, in the system of equalized temperature, heat energy can not be converted into mechanical energy, heat energy produces power must have temperature difference as thermodynamic condition, thereby has verified that the machine by the single source continuous doing work does not manufacture, or perpetual motion machine of the second kind is non-existent.
4) Carnot cycle and thermal efficiency formula thereof are significant in thermodynamic (al) development.At first, it has established the theoretical foundation of the second law of thermodynamics; Secondly, the research of Carnot cycle has been pointed out direction for improving the various heat power machine thermals efficiency, closely may improve the endothermic temperature of working medium and reduce as far as possible the exothermic temperature of working medium, and heat release is carried out when can unearned minimum temperature being atmospheric temperature approaching.What propose in Carnot cycle utilizes adiabatic compression to improve the method for gas endothermic temperature, still generally adopts in the heat power machine take gas as working medium so far.
5) limit point of Carnot cycle is atmospheric temperature, and to the process of refrigerastion circulation lower than environment temperature, Carnot cycle does not provide clear and definite answer.
But use thermodynamic (al) basic theories can not make succinctly the natural gas liquefaction device cyclic process, understand, explain intuitively, the power of one ton of LNG of every production and public utility power consumption are about 850 degree, and the energy-output ratio of process is very big.
Einstein once did evaluation to classical thermodynamics: " a kind of theory, its prerequisite is simpler, and related things is more, and its accommodation is more extensive, and it gives people's impression just more deep." basic theories of refrigerating field is explored, also answer this advantage of to succeed and develop.
Therefore the NG Liquefaction cycle process is studied, really find the theoretical foundation of refrigerating plant circulation, find the correct direction of modified flow, and organize new natural gas liquefaction device flow process on this theoretical foundation, reduce by a relatively large margin the energy consumption of natural gas liquefaction device, become the difficult point of liquefaction Technology of Natural Gas area research.
Summary of the invention
purpose of the present invention is exactly to be applied to for solving Carnot's theorem the imperfection that the natural gas liquefaction device Cyclical Theory is analyzed, proposition is cold theory of mechanics corresponding to the new refrigerating theory of thermodynamic argument, and the isobaric liquefying plant of the new natural gas that proposes this principle design of application, overcome traditional natural gas liquefaction flow process complicated, energy consumption is high, the shortcomings such as the communal facility of necessary supporting excess such as recirculating cooling water system, keep and develop the advantage of Expander-Cycle, reduce greatly energy consumption more than 30%, realize simultaneously the isobaric condensation of natural gas, maintenance of equipment and materials for later use amount significantly reduce, thereby realize the change of liquefaction Technology of Natural Gas.
Corresponding to traditional thermodynamics category, the basic conception of cold mechanics is proposed: be referred to as low-temperature receiver for the environment lower than atmospheric temperature, with respect to the thermal source higher than environment temperature; Corresponding to heat energy, heat, corresponding cold energy, cold concept are proposed; Described refrigerating plant refers to consume that mechanical power realizes cold energy from atmospheric environment to low temperature cold source or from low temperature cold source to the more transfer of low temperature cold source.When realizing the cold energy conversion, all need Cucumber as the operation material of refrigerating plant, be called refrigeration working medium.
In process of refrigerastion, Conversion of Energy and law of conservation are followed in the transmission of cold energy.
For describing direction, condition and the limit that in process of refrigerastion, cold transmits, propose cold mechanics second law: the essence of cold mechanics second law is the same with the essence of the second law of thermodynamics, follow equally " can matter decline demote principle ", being multi-form cold energy, is the difference that " matter " is arranged on the ability of changing successfully amount; Even the cold energy of same form, its existence are not simultaneously, its transfer capability is also different.The real process that all cold energy transmit, the direction that always descends towards energy matter is carried out, and all cold energy are always from being sent to the conversion of atmospheric environment direction.Cold energy can matter the raising process can not be automatically, carry out individually, the process that the process of the raising of an energy matter must be accompanied by the decline of another energy matter occurs simultaneously, this process that can matter descends is exactly to realize the compensation condition of necessity that can the matter elevation process, namely with can matter drop to cost, by way of compensation promote can the matter elevation process realization.In real process, as the energy matter decline process of cost, must be enough to compensate the process that energy matter raises, the universal law that must descend to satisfy total energy matter.Therefore, under the compensation condition that certain energy matter descends, the process that energy matter raises must have a theoretical limit the highest.Only under the ideal conditions of completely reversibility, just can reach this theoretical limit, at this moment, can just in time equal the offset that energy matter descends by the matter lift-off value, make total energy quality guarantee hold constant.As seen, reversible process is the energy matter conservative process of equidimensional ideal; Energy matter total in irreversible procedure must descend; May realize in no instance making the process of the total energy matter rising of isolated blob.Here it is can matter declines and demotes the physical connotation of principle, is the essence of cold mechanics second law, is also the essence of the second law of thermodynamics, and it has disclosed, and all Macroscopic Process are mandatory, the objective law of relative process travel direction, condition and limit.
The fundamental formular of describing cold mechanics second law is:
In formula (3), Tc2＜Tc1＜To, To is environment temperature, is Kelvin's thermometric scale.
Relative environment temperature To, the maximum cold efficient of low-temperature receiver under Tc1, Tc2 is:
Be assumed to be q
2The refrigerating capacity of circulation, w
0Be the net work that circulates and consume, when sink temperature is Tc1:
Equally, when sink temperature is Tc2:
Be not difficult to find out to (7) from formula (4), the efficient of cold mechanics is between 0 to 1, inevitable due to irreversibility in real process, and kind of refrigeration cycle efficient is always less than 1;
When environment temperature To determined, sink temperature was lower, and from the same merit of this low-temperature receiver input, the refrigerating capacity of acquisition is more, and this has indicated direction for building new natural gas liquefaction device flow process.
Need to prove:
(1) cold is spontaneously to transmit from low temperature cold source to environment temperature;
(2) can not pass to cold lower low-temperature receiver and not cause other variations from low temperature cold source;
When (3) cold was from the low temperature cold source transmission to environment, the merit amount that exchanges with the external world was w
0, wherein comprise the idle work p that environment is done
0(V
0-V
c), p
0Be atmospheric pressure, Vo is the volume under environment temperature, and Vc is the volume under sink temperature, and the maximum reversible useful work that can do is:
When (4) cold is from the low temperature cold source transmission to environment, to the unavailable energy of environment transmission be:
Idle work to the environment transmission is: p
0(V
0-V
c)
Available energy corresponding to heat
Unavailable energy " cinder " is fetched water to heat, cold fiery understanding, and the available energy for cold is named as " cold ripples ", and cold is called " cold Jin " to the unavailable energy of environment transmission, and " Jin " pronunciation is " using up ".
When (5) cold energy transmitted to environment temperature, outwards the optimum pattern of acting was for adopting the thermal generator of Seebeck (Seebeck) effect, i.e. cold power generator;
(6) in cold mechanics, energy must, also must meet Conversion of Energy and law of conservation;
(7) by using for reference the design of Finite-Time Thermodynamics, can develop the cold mechanics basic theories of finite time;
(8) can not break away from the grade that environment is estimated cold;
(9) cold mechanics and thermodynamics are two branches in energetics, both there had been the one side of opposition, exist again unified one side: in the cryogenic refrigeration circulation, under the prerequisite of following cold mechanics second law, the Rankine cycle principle is followed again in the cyclic process of the cold-producing medium working medium of constructing under low temperature environment, again get back to again Carnot law, just meet the principle that has the positive and negative sun to help mutually in the moon in Chinese traditional aesthetics.
Can find out from above-mentioned viewpoint, the cold mechanics of supposing has the theoretical frame system with the thermodynamics symmetry, meets the basic principle of the aesthetics of science, namely opposes each other and yet also complement each other, symmetry principle.
Based on above-mentioned cold mechanics basic principle, the present invention proposes to be different from the process organization of traditional natural gas liquefaction device, low energy consumption realizes the isobaric liquefaction of natural gas, and effectively reduces the energy consumption of natural gas liquefaction device, makes the ratio power-dissipation-reduced of natural gas to the 0.24kWh/kg left and right.
The objective of the invention is to realize by following measures:
The isobaric liquefying plant of a kind of natural gas, this liquefying plant comprises natural gas and treatment system, liquefaction system, benefit cooling system, stocking system, control system and fire-fighting system, it is the liquefaction flow path schematic diagram that the present invention only lists most important part, unspecified content is undertaken supporting by traditional mature technology, realize that the processing step of the isobaric liquefaction of natural gas is as follows:
(1) raw natural gas 1 is removed moisture, carbon dioxide through pretreatment unit 2, enters cool exchanger 3, separator 4 is isolated liquid heavy hydrocarbon component 5, then becomes precooling through cool exchanger 6 and enter tower unstripped gas 7;
(2) precooling enters tower unstripped gas 7 and enters lower tower 8, and the cold methane liquid backflow of mistake that produces through condenser 9 carries out rectifying, and it is LNG that isobaric condensation produces liquefied natural gas 11, and LNG sends into LNG storage tank 12;
(3) the pure methane liquid 13 that in condenser 9, isobaric condensation produces is introduced liquid pure methane storage tank 14;
(4) the benefit cooling system of described device, refer to from cold-producing medium basin 19 liquid refrigerant 20 out, through cryogenic liquid pump 21, cool exchanger 18, the refrigerant superheat steam 16 that cool exchanger 18-1 forms, after decompressor 17 expansion step-down coolings, form decompressor 17 outlet exhaust steam 22, entering condenser 9 makes the methane gas condensation produce subcooled liquid methane, from upper tower 10 out go out tower low-temperature refrigerant 15, through cool exchanger 6, the cooling raw natural gas 1 of cool exchanger 3, again through cool exchanger 18-1, cool exchanger 18, choke valve 23, return to cold-producing medium basin 19, by condenser 9, cool exchanger 6, 3 pairs of natural gas liquefaction systems of cool exchanger fill into required cold, thereby form the cold power closed circuit of cold-producing medium.
The braking equipment 24 of described decompressor 17 adopts blower fan, motor, hydraulic pump or compressor.
Described isobaric the separation, refer to enter the raw natural gas of natural gas liquefaction system, need not that reducing pressure by regulating flow liquefies as traditional natural gas liquefaction process, the raw natural gas 1 of sending here only has along the drag losses of journey equipment and pipeline, can be considered as isobaric liquefaction process.
Described liquefaction system comprises lower tower 8, condenser 9, upper tower 10, adopts integral type or split type structure.
The boiling point of described cold-producing medium under normal pressure is less than or equal to methane, include but not limited to the mist of one or more gas compositions such as methane, nitrogen, argon gas, helium, hydrogen, if guarantee safety, also can use hydrogen or liquid hydrogen, preferably nitrogen.
Described cold-producing medium basin 19 adopts necessary cold insulation measure, as adopting the cold insulation materials such as heat-insulation vacuum container, pearlife.
Described cool exchanger 6, cool exchanger 3, cool exchanger 18, cool exchanger 18-1, condenser 9 adopt the cold-exchange of shell-and-tube, plate-fin, microchannel or other patterns, its structure and to change shell-and-tube heat exchanger in cold element and traditional natural gas liquefaction flow process, plate-fin heat exchanger, micro-channel heat exchanger etc. identical is just for corresponding with refrigeration system and change title accurately.
Described cool exchanger 3, cool exchanger 6, separator 4, condenser 9, cool exchanger 18, cool exchanger 18-1 can arrange one or more.
Unaccounted equipment and back-up system thereof, pipeline, instrument, valve, cold insulation in the present invention, the mature technology with known traditional natural gas liquefaction systems of employing such as regulatory function bypass facilities carry out supporting.
Be provided with safety, the control facility supporting with natural gas liquefaction device of the present invention, make device energy economy, safety, high thermal efficiency operation, reach purpose energy-saving and cost-reducing, environmental protection.
Device of the present invention is equally applicable to the liquefaction of other gases, and the boiling point that the cold-producing medium of employing is depressed at normal atmosphere is less than or equal to the boiling point for the treatment of that accordingly liquid gas is depressed at normal atmosphere.
The present invention has following advantage compared to existing technology:
1, energy-saving effect is remarkable: the circulation compressor of cancelling traditional natural gas liquefaction system circulation, utilize the character near incompressible fluid of liquid, adopting cryogenic liquid pump to carry out supercharging mends cold, realize the equipressure liquefaction of natural gas, can effectively improve the efficient of kind of refrigeration cycle, compare with traditional natural gas liquefaction device, the fractional energy savings of identical refrigerating capacity can reach more than 30%, the more traditional advanced process of liquefied natural gas per ton economize on electricity at least 200 the degree.
2, LNG or the liquid pure methane of isobaric condensation generation can be saved the electric work of the pressurization consumption of traditional LNG or pure liquid methane.
3, can make natural gas liquefaction by low pressure, then the method for liquefied natural gas supercharging be saved the gas compression merit of traditional gas deliquescence process, the public work power consumption supporting with natural gas liquefaction system reduces more than 80%.
4, flow setting is more succinct, and the potentiality of liquefaction system are not fully exerted, and operating flexibility is large, and operation is regulated more flexible.
5, the reserve level of equipment and material has minimizing by a relatively large margin.
6, can substitute traditional main flow Basicloadtype natural gas liquefaction device such as propane pre-cooling mix refrigerant liquefaction flow path fully, become the main flow flow process of Base-type natural gas liquefaction device, peak regulation type natural gas liquefaction device.
Description of drawings
Fig. 1 is tandem type natural gas liquefaction schematic flow sheet;
Fig. 2 is APCI propane pre-cooling mix refrigerant liquefaction flow path schematic diagram;
Fig. 3 is natural gas expansion liquefaction flow path:
In Fig. 3: the 1-dehydrating agent, 2-carbon dioxide removal tower, the 3-water cooler, 4-returns to air compressor, and 5,6, the 7-heat exchanger, 8-subcooler, 9-storage tank, 10-decompressor, 11-compressor.
Fig. 4 is the nitrogen expansion liquefaction flow path:
In Fig. 4: 1-pretreatment unit, 2,4, the 5-heat exchanger, 3-heavy hydrocarbon separator, 6-nitrogen stripper, 7-turbo-expander, 8-nitrogen-methane separation tower, 9-recycle compressor.
Fig. 5 is the natural gas expansion liquefaction schematic flow sheet with propane pre-cooling:
In Fig. 5: 1,3,5,6, the 7-heat exchanger, 2,4-propane heat exchanger, 8-water cooler, 9-compressor, 10-brake compressor, 12,13, the 14-gas-liquid separator.
Fig. 6 is the isobaric liquefying plant schematic flow sheet of a kind of natural gas of the present invention:
in Fig. 6: the 1-raw natural gas, the 2-pretreatment unit, the 3-cool exchanger, 4-heavy hydrocarbon separator, the liquid heavy hydrocarbon component of 5-, the 6-cool exchanger, the 7-precooling enters the tower unstripped gas, tower under 8-, the 9-condenser, the upper tower of 10-, 11-LNG, the 12-LNG storage tank, the pure liquid methane of 13-, the pure liquid methane storage tank of 14-, 15-goes out the tower low-temperature refrigerant, 16-refrigerant superheat steam, the 17-decompressor, the 18-cool exchanger, the 18-1-cool exchanger, 19-cold-producing medium storage tank, the 20-liquid refrigerant, the 21-cryogenic liquid pump, 22-decompressor outlet exhaust steam, the 23-choke valve, the 24-braking equipment.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1:
As shown in Figure 6, the isobaric liquefying plant of a kind of natural gas, cold-producing medium adopts nitrogen, and specific embodiment is as follows:
(1) raw natural gas 1 is removed moisture, carbon dioxide through pretreatment unit 2, enters cool exchanger 3, separator 4 is isolated liquid heavy hydrocarbon component 5, then becomes precooling through cool exchanger 6 and enter tower unstripped gas 7;
(2) precooling enters tower unstripped gas 7 and enters lower tower 8, and the cold methane liquid backflow of mistake that produces through condenser 9 carries out rectifying, and it is LNG that isobaric condensation produces liquefied natural gas 11, and LNG sends into LNG storage tank 12;
(3) the pure methane liquid 13 that in condenser 9, isobaric condensation produces is introduced liquid pure methane storage tank 14;
(4) the benefit cooling system of described device, refer to from cold-producing medium basin 19 liquid refrigerant 20 out, through cryogenic liquid pump 21, cool exchanger 18, the refrigerant superheat steam 16 that cool exchanger 18-1 forms, after decompressor 17 expansion step-down coolings, form decompressor 17 outlet exhaust steam 22, entering condenser 9 makes the methane gas condensation produce subcooled liquid methane, from upper tower 10 out go out tower low-temperature refrigerant 15, through cool exchanger 6, the cooling raw natural gas 1 of cool exchanger 3, again through cool exchanger 18-1, cool exchanger 18, choke valve 23, return to cold-producing medium basin 19, by condenser 9, cool exchanger 6, 3 pairs of natural gas liquefaction systems of cool exchanger fill into required cold, thereby form the cold power closed circuit of cold-producing medium.
The braking equipment 24 of described decompressor 17 adopts compressor, is used for raw natural gas is carried out supercharging.
Described refrigeration working medium basin 19 adopts necessary cold insulation measure, as adopting the cold insulation materials such as heat-insulation vacuum container, pearlife.
Unaccounted equipment and back-up system thereof, pipeline, instrument, valve, cold insulation in the present invention, the mature technology with known traditional natural gas liquefaction systems of employing such as regulatory function bypass facilities carry out supporting.
Be provided with safety, the control facility supporting with natural gas liquefaction device of the present invention, make device energy economy, safety, high thermal efficiency operation, reach purpose energy-saving and cost-reducing, environmental protection.
Although the present invention with preferred embodiment openly as above, they are not to limit the present invention, anyly are familiar with this skill person, without departing from the spirit and scope of the invention, certainly when making various changes or retouch, belong to equally the present invention's protection domain.Therefore protection scope of the present invention should with the application claim was defined is as the criterion.
Claims (10)
1. the isobaric liquefying plant of a natural gas, this device comprises natural gas pretreatment system, chilldown system, liquefaction system, benefit cooling system, stocking system, control system and fire-fighting system, it is characterized in that:
described benefit cooling system, refer to from cold-producing medium basin (19) liquid refrigerant (20) out, through cryogenic liquid pump (21), cool exchanger (18) forms refrigerant superheat steam (16), after decompressor (17) expansion step-down cooling, form decompressor (17) outlet exhaust steam (22), entering condenser (9) makes the methane gas condensation produce subcooled liquid methane, from upper tower (10) out go out tower low-temperature refrigerant (15), through cool exchanger (6), the cooling raw natural gas 1 of cool exchanger (3), again through cool exchanger (18), return to cold-producing medium basin (19), thereby form the cold power closed circuit of cold-producing medium.
2. device according to claim 1 is characterized in that:
Be provided with choke valve (23):
from cold-producing medium basin (19) liquid refrigerant (20) out, through cryogenic liquid pump (21), cool exchanger (18) forms refrigerant superheat steam (16), after decompressor (17) expansion step-down cooling, form decompressor (17) outlet exhaust steam (22), entering condenser (9) makes the methane gas condensation produce subcooled liquid methane, from upper tower (10) out go out tower low-temperature refrigerant (15), through cool exchanger (6), the cooling raw natural gas of cool exchanger (3) (1), again through cool exchanger (18), choke valve (23), return to cold-producing medium basin (19), thereby form the cold power closed circuit of cold-producing medium.
3. device according to claim 2 is characterized in that:
Be provided with cool exchanger (18-1):
from cold-producing medium basin (19) liquid refrigerant (20) out, through cryogenic liquid pump (21), cool exchanger (18), cool exchanger (18-1) forms refrigerant superheat steam (16), after decompressor (17) expansion step-down cooling, form decompressor (17) outlet exhaust steam (22), entering condenser (9) makes the methane gas condensation produce subcooled liquid methane, from upper tower (10) out go out tower low-temperature refrigerant (15), through cool exchanger (6), the cooling raw natural gas of cool exchanger (3) (1), again through cool exchanger (18-1), cool exchanger (18), or and choke valve (23), return to cold-producing medium basin (19), thereby form the cold power closed circuit of cold-producing medium.
One of according to claim 1 to 3 described device, it is characterized in that:
The braking equipment (24) of described decompressor (17) adopts blower fan, motor, hydraulic pump or compressor.
One of according to claim 1 to 3 described device, it is characterized in that:
Described liquefaction system comprises lower tower (8), condenser (9), upper tower (10), adopts integral type or split type structure.
6. device according to claim 4 is characterized in that:
Described liquefaction system comprises lower tower (8), condenser (9), upper tower (10), adopts integral type or split type structure.
7. device according to claim 6 is characterized in that:
The boiling point of described cold-producing medium under normal pressure be less than or equal to methane, comprises the mixture that a kind of gas in methane, nitrogen, argon gas, helium, hydrogen or multiple gases form.
8. device according to claim 7 is characterized in that:
Device of the present invention is equally applicable to the liquefaction of other gases, and the boiling point that the cold-producing medium of employing is depressed at normal atmosphere is less than or equal to the boiling point for the treatment of that accordingly liquid gas is depressed at normal atmosphere.
9. device according to claim 1 is characterized in that:
The boiling point of described cold-producing medium under normal pressure be less than or equal to methane, comprises the mixture that a kind of gas in methane, nitrogen, argon gas, helium, hydrogen or multiple gases form.
10. device according to claim 1 is characterized in that:
Device of the present invention is equally applicable to the liquefaction of other gases, and the boiling point that the cold-producing medium of employing is depressed at normal atmosphere is less than or equal to the boiling point for the treatment of that accordingly liquid gas is depressed at normal atmosphere.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822417A (en) * | 2014-02-18 | 2014-05-28 | 华南理工大学 | Refrigerant concentration control system for single-stage mixed refrigerant natural gas liquefaction processes |
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| CN116804381A (en) * | 2023-06-29 | 2023-09-26 | 米奇科技（北京）有限公司 | Liquid air energy storage power generation system and equipment |
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| CN103162511B (en) | 2015-10-21 |
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