CN106351697A - Natural gas pressure energy recycling expansion power generation and cold energy utilization system - Google Patents
Natural gas pressure energy recycling expansion power generation and cold energy utilization system Download PDFInfo
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- CN106351697A CN106351697A CN201610916456.1A CN201610916456A CN106351697A CN 106351697 A CN106351697 A CN 106351697A CN 201610916456 A CN201610916456 A CN 201610916456A CN 106351697 A CN106351697 A CN 106351697A
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- heat exchanger
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- natural gas
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C13/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
- F01C1/14—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F01C1/16—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C11/00—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type
- F01C11/002—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type of similar working principle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/04—Lubrication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/06—Heating; Cooling; Heat insulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to the technical field of top pressure power generation and cold energy utilization and particularly relates to a natural gas pressure energy recycling expansion power generation and cold energy utilization system. The system provided by the invention has the advantages of high pressure energy recycling efficiency, high cold energy utilization efficiency, heat compensation using air source, high overall utilization efficiency, good economic benefits and the like. According to the technical scheme, the system comprises a screw expander which is connected with a generator, wherein a preheating heat exchanger is connected with a natural gas pipeline and the screw expander; the screw expander is connected with an interstage heat exchanger; the interstage heat exchanger is connected with the screw expander and a heat pump unit; the screw expander is connected with a first-level oil-gas separator; the first-level oil-gas separator is connected with a second-level oil-gas separator; the second-level oil-gas separator is connected with a heat exchanger; and the heat exchanger is connected with an ice making unit.
Description
Technical field
The present invention relates to top pressure power generation and cold energy use technical field, more particularly, to a kind of pressure energy of natural gas recycling
Expansion power generation and cold energy use system.
Background technology
The natural gas of national gas distributing system, in pipe conveying procedure, maintains higher pressure all the time, its pressure one
As in 10mpa.To each big city pipe network and industrial user, it mainly passes through each the natural gas transportation of national gas distributing system
The voltage regulating station of big city pipe network realizes blood pressure lowering, is typically reduced to 4.0mpa from 10mpa, and natural gas after blood pressure lowering passes through each again
The urban gate station pressure regulation of big city pipe network, to 0.4mpa, is transported to terminal use.In the pressure reduction at natural gas pressure regulating station,
There is huge pressure energy and cold energy can utilize, meanwhile, the temperature of the pipe natural gas after blood pressure lowering is less than -20 DEG C,
Have to carry out concurrent heating to natural gas, to ensure the natural temperature after the pressure regulation of urban gate station higher than 5 DEG C.Current pressure regulation
Station is the pressure reducing natural gas by pressure regulating valve, and meanwhile, by burning, natural gas is heated to the weather in pipeline, its
Waste substantial amounts of pressure energy, cold energy and heat energy, if will be able to have by a kind of mode by this pressure energy and cold energy recycle
There are very big social benefit and economic benefit.
Because the operating pressure of natural gas is high, sealing requirements are strict, forbid leaking, and the intensity requirement of body is high, existing
Technology in be difficult to find a kind of applicable dynamic power machine and carry out energy regenerating.And screw expander be one kind driven by gases at high pressure
The dynamic power machine of the negative and positive rotor rotation of dynamic screw rod, its core component is a pair intermeshing negative and positive rotor, and it is special interior
Portion's structure, determines screw expander and is suitable for the recovery of pressure energy of natural gas and generated electricity, its be a kind of range of application very
Widely specially reclaim the new and high technology that pressure energy of natural gas is generated electricity.
After pressure energy being reclaimed using screw expander, the temperature of natural gas also can be reduced to less than -20 DEG C, after expansion
Cryogenic natural gas have huge cold energy, how by this cold energy use, can rise to the natural gas temperature after expanding again meanwhile
More than 5 DEG C, be the another big difficult point in pressure energy of natural gas and cold energy recycle.
Content of the invention
The present invention be solve prior art exist the pressure regulation of natural gas pressure regulating station after pressure energy and cold energy cannot utilize, with
This needs to waste the problem that substantial amounts of natural gas carries out burning concurrent heating, there is provided a kind of pressure energy of natural gas reclaims profit simultaneously again
Expansion power generation and cold energy use system.
For solving the problems, such as prior art, the technical scheme is that a kind of pressure energy of natural gas recycles
Expansion power generation and cold energy use system it is characterised in that: include screw expander, electromotor, preheating heat exchanger, heat exchange between level
Device, source pump, one-level gs-oil separator, two grades of gs-oil separators, heat exchanger and ice making unit；Described electromotor and screw rod
Decompressor is set together by shaft coupling, and the gas inlet adapter of described preheating heat exchanger passes through pipeline and natural gas line
Connect, the described gas outlet joint of preheating heat exchanger is connected with the one-level air inlet of screw expander；Described screw rod is swollen
The one-level air vent of swollen machine is connected with the gas inlet adapter of heat exchanger between level, the gas outlet joint of heat exchanger and screw rod between level
The secondary inlet mouth of decompressor connects；Level between heat exchanger refrigerating medium inlet-outlet connector with by the refrigerating of pipeline and source pump
Agent inlet-outlet connector connects；The secondary exhaust of described screw expander is connected with the air inlet of one-level gs-oil separator；One
The air vent of level gs-oil separator is connected with the air inlet of two grades of gs-oil separators；The air vent of two grades of gs-oil separators and heat exchange
The air inlet of device is connected by pipeline, and the refrigerating medium inlet-outlet connector of heat exchanger is connected with the refrigerating medium inlet-outlet connector of ice making unit
Connect；
Described screw expander is at least provided with one.
The secondary oil return interface of the oil return interface of two grades of described gs-oil separators and one-level gs-oil separator passes through oil pipe
Connect, described one-level gs-oil separator and the oil-out of two grades of gs-oil separators are set together with the oil-in of oil pump.
The described oil storage tank of one-level gs-oil separator is connected with the import of oily coarse filter, the oil drain out of oily coarse filter
It is connected with the import of oil heater.
The oil drain out of described oil pump is connected with olein filter, and the oil drain out of olein filter is with oil pressure adjusting valve even
Connect.
Described oil pressure adjusting valve oil drain out is connected with the oil-feed port of screw expander.
Compared with prior art, advantages of the present invention is as follows:
The present invention is had pressure energy organic efficiency height, cold energy use efficiency high, is carried out concurrent heating, whole utilization efficiency using air source
High, good in economic efficiency the advantages of, its can be widely applied to pressure energy in the voltage-regulating system of the urban gate station of natural gass at different levels and
Cold energy recycle, has very big social benefit and economic benefit.
Brief description
Fig. 1 is the structure chart of the present invention；
Fig. 2 is the structural representation of screw expansion agent；
Description of reference numerals, heat exchanger between 1- screw expander, 2- electromotor, 3- preheating heat exchanger, 4- level, 5- source pump,
6- one-level gs-oil separator, bis- grades of gs-oil separators of 7-, 8- heat exchanger, 9- ice making unit, 10- oil coarse filter, 11- oil heating
Device, 12- oil pump, 13- olein filter, 14- oil pressure adjusting valve, 15- one-level body, 16- one-level suction end base, bis- grades of machines of 17-
Body, bis- grades of suction end bases of 18-, 19- one-level body gland, 20- one-level male rotor, 21- one-level female rotor, bis- grades of male rotors of 22-,
Bis- grades of female rotors of 23-, 24- cylinder roller bearing one, 25- one-level dummy piston, 26- primary oil cylinder sleeve, 27- one-level labyrinth seal
Set, 28- cylinder roller bearing two, the single-row angular contact bearing of 29- one, the single-row angular contact bearing of 30- two, 31- stripped nut one,
32- coupling assembly, 33- secondary maze sealing shroud, 34- cylinder roller bearing two, 35- four-point contact ball, 36- locking circle
Nut two, bis- grades of female rotor bearing glands of 37-, bis- grades of suction end glands one of 38-, bis- grades of male rotor bearing glands of 39-, 40-o type
Sealing ring, 41- axle envelope installation set, 42- axle envelope one, 43- axle envelope axle sleeve, 44- mechanical sealing assembly, 45- axle envelope two, bis- grades of 46-
Suction end gland two, 47- cylinder roller bearing three, bis- grades of dummy pistons of 48-, 49- two-level oil cylinder set, 50- single-row angular contact axle
Hold three.
Specific embodiment
Below in conjunction with the accompanying drawings the design is described in detail:
Referring to Fig. 1: expansion power generation and cold energy use system that a kind of pressure energy of natural gas recycles, including screw expander 1,
Heat exchanger 4, source pump 5,6, two grades of gs-oil separators 7 of one-level gs-oil separator between electromotor 2, preheating heat exchanger 3, level, change
Hot device 8 and ice making unit 9；Described electromotor 2 and screw expander 1 are set together by shaft coupling；
The gas inlet adapter of described preheating heat exchanger 3 is connected with natural gas line by pipeline, described preheating heat exchanger 3
Gas outlet joint be connected with the one-level air inlet of screw expander 1 by pipeline；To the sky coming from natural gas line
So gas carries out preheating heating, and the natural gas after preheating enters screw expander 1；The one-level air vent of described screw expander 1
It is connected by the gas inlet adapter of heat exchanger between pipeline and level 4, between level, the gas outlet joint of heat exchanger 4 passes through pipeline and spiral shell
The secondary inlet mouth of bar decompressor 1 connects；Between level, the refrigerating medium inlet-outlet connector of heat exchanger 4 passes through pipeline and source pump 5
Refrigerating medium inlet-outlet connector connects, and the refrigerating medium in heat exchanger 4 between level is pipelined in source pump 5, source pump 5
The heat of in the air is conveyed to the natural gas in heat exchanger 4 between level, has reached to the natural purpose carrying out concurrent heating intensification；Described
The secondary exhaust of screw expander 1 be connected with the air inlet of one-level gs-oil separator 6；One-level gs-oil separator 6 is to natural
Gas is slightly imitated separating and filtering with oily mixture；The air vent of one-level gs-oil separator 6 and the air inlet of two grades of gs-oil separators 7
Mouth connects；Two grades of gs-oil separators 7 carry out accurate separating and filtering to the mixture of natural gas and oil so that lubrication in natural gas
Oil content is less than 1mg/nm3；The air vent of two grades of gs-oil separators 7 is connected by pipeline with the air inlet of heat exchanger 8, heat exchanger
8 refrigerating medium inlet-outlet connector is connected with the refrigerating medium inlet-outlet connector of ice making unit 9 by pipeline, the load within heat exchanger 8
Cryogen is pipelined in ice making unit 9, the cold in ice making unit 9 absorption heat-exchange device 8, carries out ice making；
The secondary oil return interface of the oil return interface of two grades of described gs-oil separators 7 and one-level gs-oil separator 6 is by oil pipe even
Connect, the oil-out of described one-level gs-oil separator 6 and two grades of gs-oil separators 7 is set together with the oil-in of oil pump 12.
The oil storage tank of one-level gs-oil separator 6 is connected with the import of oily coarse filter 10, the oil drain out of oily coarse filter 10
Import with oil heater 11 is connected；
The lubricating oil of the internal oil storage tank of one-level gs-oil separator 6 enters the entrance of oily coarse filter 10, and oily coarse filter 10 is right
Large granular impurity in lubricating oil carries out coarse filtration；The described oil drain out of oily coarse filter 10 and the import of oil heater 11 set
Put together, the refrigerating medium within oil heater 11 heats up to lubricating oil；The described oil drain out of oil heater 11 and oil
The oil-in of pump 12 is set together, and oil pump 12 carries out boosting to setting pressure to lubricating oil；The oil drain out of described oil pump 12
It is connected with olein filter 13, described olein filter 13 carries out secondary filter to the subparticle impurity in lubricating oil；Institute
The oil drain out of olein filter 13 stated is connected with oil pressure adjusting valve 14, and oil pressure adjusting valve 14 adjusts and enters dilating screw machine 1
Lubricating oil pressure, the lubricating oil in described oil pressure adjusting valve 14 drain line respectively enters the oil-feed port of dilating screw machine 1, right
Dilating screw machine 1 is lubricated and provides oil pressure.
Described screw expander 1, at least provided with one, realizes two-stage or multiple expansion for one, multiple stage realize two-stage or
Multiple expansion, during multiple stage, every screw expander is cascaded.
Screw expander includes one-level body 15,16, two grades of bodies 17 of one-level suction end base and two grades of suction end bases 18, institute
The one-level body 15 stated and two grades of bodies 18 are hollow shell, and the one-level suction end 16 of one-level body 15 and two grades of bodies 17 are even
Connect, the other end of one-level body 15 is provided with one-level body gland 19, and the other end of two grades of bodies 17 is provided with two grades of suction ends
Seat 18, two grades of described suction end bases 18 are provided with two grades of suction end glands 1 and two grades of suction end glands 2 46；
It is provided with one-level male rotor 20 and one-level female rotor 21, described one-level male rotor 20 and cloudy turn of one-level in one-level body 15
Son 21 is relatively set into cylindric, and two side axles of one-level male rotor 20 and one-level female rotor 21 are respectively arranged at one-level body 15 He
In one-level suction end base 16, the exhaust side rotating shaft of one-level male rotor 20 is disposed with cylinder roller bearing 1, one-level is put down
Weighing apparatus piston 25, described the provided circumferentially about of one-level dummy piston 25 has primary oil cylinder sleeve 26, the exhaust side of one-level female rotor 21
Cylinder roller bearing 1 is provided with rotating shaft；Described cylinder roller bearing 1 is mainly used in bearing one-level male rotor 20 He
The radial gas power of one-level female rotor 21；Described one-level dummy piston 25 and primary oil cylinder sleeve 26 are arranged at cylinder roller bearing
One 24 outside, one-level dummy piston 25 is arranged in the aerofluxuss side axle of one-level male rotor 20,
It is disposed with one-level labyrinth seal respectively in the suction side rotating shaft of described one-level male rotor 20 and one-level female rotor 21
Set 27, cylinder roller bearing 2 28, single-row contact ball bearing 1, single-row contact ball bearing 2 30 and stripped nut 1,
Single-row contact ball bearing 3 50 is additionally provided with the suction side rotating shaft of described one-level male rotor 20, described single-row contact ball axle
Hold 3 50 right sides being arranged at single-row contact ball bearing 2 30, described one-level labyrinth seal set 27 and one-level male rotor 20 and
Throttling sealing is realized in the exhaust side rotating shaft of level female rotor 21；Cylinder roller bearing 2 28 is arranged at the outer of one-level labyrinth seal set 27
Side, it is mainly used in bearing the radial gas power of one-level male rotor 20 and one-level female rotor 21, outside cylinder roller bearing 2 28
Side is provided with single-row contact ball bearing 1 and single-row contact ball bearing 2 30, is mainly used in bearing one-level male rotor 20 and one-level
The axial gas power of female rotor 21；Stripped nut 1 is arranged at the outside of single-row contact ball bearing 2 30, is mainly used in solid
Determine cylinder roller bearing 2 28, single-row contact ball bearing 1 and single-row contact ball bearing 2 30.
It is provided with two grades of male rotors 22 and two grades of female rotors 23, described two grades of male rotors 22 and two grades in two grades of bodies 17
Female rotor 23 is relatively set into cylindric；Two side axles of described two grades of male rotors 22 and two grades of female rotors 23 are respectively arranged at two
In level body 17 and two grades of suction end bases 18；
Secondary maze sealing shroud 33, cylinder rolling are respectively arranged with the suction side rotating shaft of two grades of male rotors 22 and two grades of female rotors 23
Sub- bearing 2 34, four-point contact ball 35 and stripped nut 2 36, described secondary maze sealing shroud 33 is turned with two grades of sun
Throttling sealing is realized in the suction side rotating shaft of son 22 and two grades of female rotors 23；Cylinder roller bearing 2 34 is arranged at secondary maze sealing
The outside of set 33, it is mainly used in bearing the radial gas power of two grades of male rotors 22 and two grades of female rotors 23, cylinder roller bearing
2 34 outside is provided with four-point contact ball 35, is mainly used in bearing the axial direction of two grades of male rotors 22 and two grades of female rotors 23
Gas force；Stripped nut 2 36 is arranged at the outside of four-point contact ball 35, is mainly used in fixed cylinder roller bearing two
34 and the inner ring of four-point contact ball 35；Two grades of described female rotor bearing glands 37 are arranged in two grades of suction end bases 18,
Outer ring for fixed cylinder roller bearing 2 34 and four-point contact ball 35；Two grades of described suction end gland 1 settings
In the outside of two grades of female rotor bearing glands 37, it is used for fixing two grades of female rotor bearing glands 37；
Two grades of described male rotors 22 suction side rotating shaft on be additionally provided with mechanical sealing assembly 44, in two grades of suction end bases 18
It is additionally provided with two grades of male rotor bearing glands 39, two grades of male rotor bearing glands 39 are arranged at the right side of four-point contact ball 35
Side, for the outer ring of fixed cylinder roller bearing 2 34 and four-point contact ball 35, described two grades of male rotor bearing glands
Arrange fluted on 39 excircle, be provided with o type sealing ring 40 in groove, for sealing the gas of compound expansion endoluminal leak
Body；Axle envelope installation set 41 is provided with the inner periphery of two grades of male rotor bearing glands 39, the inner periphery of axle envelope installation set 41 sets
It is equipped with axle envelope 1, axle envelope 1 is arranged on axle envelope axle sleeve 43, and axle envelope axle sleeve 43 is arranged at the suction side of two grades of male rotors 22
In rotating shaft, axle envelope 1 is contacted with axle envelope axle sleeve 43, for sealing the gas of compound expansion endoluminal leak；Outside axle envelope axle sleeve 43
Side is provided with mechanical sealing assembly 44, for sealing the gas of compound expansion endoluminal leak；
3 47, two grades of dummy pistons of cylinder roller bearing are respectively arranged with the exhaust side rotating shaft of two grades of described male rotors 22
48th, two-level oil cylinder's set 49, the exhaust side rotating shaft of two grades of female rotors 23 is respectively arranged with cylinder roller bearing 3 47, described circle
Post roller bearing 3 42 is mainly used in bearing the radial gas power of two grades of male rotors 22 and two grades of female rotors 23；Described two grades are put down
Weighing apparatus piston 48 and two-level oil cylinder cover 49 outsides being arranged at cylinder roller bearing 3 47, and two grades of dummy pistons 48 are arranged on two grades of sun
In the aerofluxuss side axle of rotor 22, two-level oil cylinder's set 49 is arranged on inside two grades of bodies 17, and two grades of described dummy pistons 48 are arranged
In described two-level oil cylinder's set 49, two grades of described dummy pistons 48 are in the presence of having the lubricating oil setting pressure, right
Two grades of male rotors 22 apply the active force setting, for the gas force effect suffered by two grades of male rotors 22 of balance, two-level oil cylinder
Set 49 is arranged on inside two grades of bodies 17, the row of the described suction end roller end of one-level male rotor 20 and two grades of male rotors 22
Gas end roller end is connected by coupling assembly 32；The outside of two grades of described male rotor bearing glands 39 is provided with two grades of suctions
Gas side pressure lid 2 46, is used for fixing two grades of suction end glands 2 46；It is provided with axle envelope in the inner ring of two grades of suction end glands 2 46
2 45, for sealing the gas of compound expansion endoluminal leak；
Described one-level dummy piston 25 is arranged in described primary oil cylinder sleeve 26, and described one-level dummy piston 25 has
In the presence of setting the lubricating oil of pressure, one-level male rotor 20 is applied with the active force setting, for balancing one-level male rotor 20
Suffered gas force effect.
Two grades of described dummy pistons 48 are arranged in described two-level oil cylinder's set 49.
Described coupling assembly 32 is arranged on the outside of two grades of dummy pistons 48 and two single-row contact ball bearings 2 30
Outside.
Described primary oil cylinder sleeve 26 is arranged on inside one-level body 15.
The rotating shaft of two grades of described male rotor 23 suction ends stretches out in two grades of suction end glands 2 46.
The work process of the present invention: the high-pressure natural gas coming from natural gas line enter warmup heater 3, through preheating
The air inlet a that high-pressure natural gas afterwards pass through on one-level suction end base 16 enters one-level male rotor 20 and one-level female rotor 21 forms
Air-breathing intracavity, complete one-level intake process；The high-pressure natural gas of one-level air-breathing intracavity carry out one-stage expansion, drive one-level sun to turn
Son 20 and one-level female rotor 21 rotate, and complete one-stage expansion process；In one-level male rotor 20 and one-level female rotor 21 rotation process
In, the intermediate pressure after expansion work defeats the vent ports b discharge that natural gas passes through on one-level body 15, completes one-level aerofluxuss
Journey；Natural gas after one-stage expansion enters heat exchanger 4 between level, and the temperature due to the natural gas after one-stage expansion reduces, and needs logical
Cross the cold that secondary refrigerant liquid absorbs natural gas, the secondary refrigerant liquid in heat exchanger 4 between level is conveyed to source pump 5, heat pump machine
Natural gas in group 5 heat exchangers 4 between level heats,；Between by level, the natural gas of heat exchanger 4 enters two grades of suction end bases 18
Air-breathing aperture c in, enter two grades of male rotors 22 and the air-breathing intracavity of two grades of female rotors 23 composition, complete secondary inlet process；
The intermediate pressure natural gas of two grades of air-breathing intracavity carries out compound expansion, drives two grades of male rotors 22 and two grades of female rotors 23 to rotate,
Complete compound expansion process；In two grades of negative and positive rotor rotation processes, after the natural gas expansion work of intermediate pressure, pass through two grades
Vent ports d on body 17 are discharged, and complete secondary exhaust process；Natural gas after the compound expansion of dilating screw machine 1
In contain substantial amounts of lubricating oil, this gas mixture needs to carry out Oil-gas Separation purification, and one-level gs-oil separator 6 is to natural gas and oil
Gas mixture carries out primary separation filtration, and two grades of gs-oil separators 7 carry out accurate separating and filtering to gas in natural gas mixture；Cross
Natural gas after filter, due to natural gas compound expansion, the reason temperature reduces, needs to utilize the cold of refrigerating medium by ice making unit 9
Amount carries out ice making (ice cube or flake ice), and the natural gas transportation after heat exchange is to terminal use；One-level gas separating device 6 and two grades of oil gas divide
Lubricating oil within from device 7 and the lubricating oil separating pass through slightly to be imitated in the extremely oily coarse filter 10 of pipe influx
Filter, intercepts the large granular impurity in lubricating oil；Lubricating oil after thick effect filters enters in oil heater 11, by refrigerating medium to profit
Lubricating oil is heated；Lubricating oil after heating is forced into setting pressure by oil pump 12, and the lubricating oil after pressurization passes through olein mistake
Filter 13 carries out secondary filter, intercepts the molecule in lubricating oil；Lubricating oil after oil pressure adjusting valve 14 pressure regulation is respectively
Enter the oil-feed port of dilating screw machine 1, dilating screw machine 1 is lubricated and oil pressure is provided.
Described above is not the restriction to invention, and the present invention is also not limited to the example above, the skill of the art
Change, remodeling, interpolation or replacement that art personnel are made in the essential scope of the present invention, belong to the protection model of the present invention
Enclose.
Claims (6)
1. pressure energy of natural gas recycle expansion power generation and cold energy use system it is characterised in that: include screw expander
(1), heat exchanger (4) between electromotor (2), preheating heat exchanger (3), level, source pump (5), one-level gs-oil separator (6), two grades
Gs-oil separator (7), heat exchanger (8) and ice making unit (9)；Described electromotor (2) passes through shaft coupling with screw expander (1)
It is set together, the gas inlet adapter of described preheating heat exchanger (3) is connected with natural gas line by pipeline, and described is pre-
The gas outlet joint of heat exchanger (3) is connected with the one-level air inlet of screw expander (1)；Described screw expander (1)
One-level air vent be connected with the gas inlet adapter of heat exchanger between level (4), the gas outlet joint of heat exchanger (4) and spiral shell between level
The secondary inlet mouth of bar decompressor (1) connects；Level between heat exchanger (4) refrigerating medium inlet-outlet connector with by pipeline and heat pump machine
The refrigerating medium inlet-outlet connector of group (5) connects；The described secondary exhaust of screw expander (1) and one-level gs-oil separator
(6) air inlet connects；The air vent of one-level gs-oil separator (6) is connected with the air inlet of two grades of gs-oil separators (7)；Two grades
The air vent of gs-oil separator (7) is connected by pipeline with the air inlet of heat exchanger (8), and the refrigerating medium of heat exchanger (8) is imported and exported
Joint is connected with the refrigerating medium inlet-outlet connector of ice making unit (9).
2. a kind of pressure energy of natural gas according to claim 1 recycles expansion power generation and cold energy use system, its
It is characterised by: described screw expander (1) is at least provided with one.
3. a kind of pressure energy of natural gas according to claim 1 and 2 recycles expansion power generation and cold energy use system,
It is characterized in that: the secondary oil return interface of the described oil return interface of two grades of gs-oil separators (7) and one-level gs-oil separator (6)
Connected by oil pipe, described one-level gs-oil separator (6) and the oil-out of two grades of gs-oil separators (7) and entering of oil pump (12)
Hydraulic fluid port is set together.
4. a kind of pressure energy of natural gas according to claim 3 recycles expansion power generation and cold energy use system, its
It is characterised by: the described oil storage tank of one-level gs-oil separator (6) is connected with the import of oily coarse filter (10), oily coarse filter
(10) oil drain out is connected with the import of oil heater (11).
5. a kind of pressure energy of natural gas according to claim 4 recycles expansion power generation and cold energy use system, its
Be characterised by: the described oil drain out of oil pump (12) is connected with olein filter (13), the oil drain out of olein filter (13) with
Oil pressure adjusting valve (14) connects.
6. a kind of pressure energy of natural gas according to claim 5 recycles expansion power generation and cold energy use system, its
It is characterised by: described oil pressure adjusting valve (14) oil drain out is connected with the oil-feed port of screw expander (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610916456.1A CN106351697A (en) | 2016-10-21 | 2016-10-21 | Natural gas pressure energy recycling expansion power generation and cold energy utilization system |
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| DE102017121954A1 (en) * | 2017-09-21 | 2019-03-21 | GasNet s.r.o. | Screw expanders and methods for generating mechanical energy by expanding a working fluid |
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Application publication date: 20170125 |