CN105927491A - Natural gas pressure-difference power generation and energy cascade utilization coupling system and application method thereof - Google Patents
Natural gas pressure-difference power generation and energy cascade utilization coupling system and application method thereof Download PDFInfo
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- CN105927491A CN105927491A CN201610456154.0A CN201610456154A CN105927491A CN 105927491 A CN105927491 A CN 105927491A CN 201610456154 A CN201610456154 A CN 201610456154A CN 105927491 A CN105927491 A CN 105927491A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 426
- 239000003345 natural gas Substances 0.000 title claims abstract description 213
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000008878 coupling Effects 0.000 title claims abstract description 17
- 238000010168 coupling process Methods 0.000 title claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 17
- 238000010248 power generation Methods 0.000 title abstract description 5
- 239000007789 gas Substances 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000000605 extraction Methods 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 238000011084 recovery Methods 0.000 claims description 24
- 230000007613 environmental effect Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 230000008901 benefit Effects 0.000 claims description 6
- 239000000567 combustion gas Substances 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 6
- 230000036772 blood pressure Effects 0.000 claims description 5
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims description 3
- 230000001172 regenerating effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 12
- 238000004064 recycling Methods 0.000 abstract 4
- 239000002918 waste heat Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 6
- 238000003306 harvesting Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 241000191291 Abies alba Species 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000004058 oil shale Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a natural gas pressure-difference power generation and energy cascade utilization coupling system and an application method thereof. Generally, a gas extraction tree is adopted for decompressing exploited natural gas; the gas extraction tree usually consists of throttle valves; during a throttling process, the pressure of the natural gas is reduced, but a great quantity of implied pressure energy of the natural gas is wasted as well. The method disclosed by the invention comprises a natural gas pressure difference energy cooling recycling group (1) which consists of natural gas pressure difference energy cooling recycling devices (2) which are connected in single-stage or multi-stage serial connection; the natural gas pressure difference energy cooling recycling group is connected with a steam turbine (3); the steam turbine is connected with a waste heat driven generator (4) and a boiler (5); the boiler is connected with the natural gas pressure difference energy cooling recycling group through a booster pump (6); the boiler is also connected with a gas turbine (7). The application method disclosed by the invention is applied to the natural gas pressure-difference power generation and energy cascade utilization coupling system.
Description
Technical field:
The present invention relates to a kind of natural gas pressure difference generating and cascaded utilization of energy coupled system and using method.
Background technology:
In gas exploitation course, from the natural gas discharged at the bottom of ground, with higher pressure energy, commonly reach
30 MPa
Arrive
100 MPa
, the gas pressure through voltage regulating station distribution exists
6MPa
Left and right, the pressure of actual user's pipeline exists
0.4MPa
.Generally by christmas tree, the natural gas of exploitation being carried out blood pressure lowering process, christmas tree mostly is choke valve composition.In throttling process, although pressure reduces, but its pressure contained can also be slatterned in a large number.
For from the process technique of oil and gas development, the processing mode of reducing pressure by regulating flow wastes gas pressure energy greatly.For the pressure potential utilizing natural gas to be contained, most efficient method is to use high-pressure natural gas to expand the transform mode replacement reducing pressure by regulating flow process producing mechanical power, the pressure energy of natural gas is converted into mechanical energy and carries out generating electricity or as other driving sources.So can not only produce new forms of energy, and environmental protection, the economic benefit of generation and social benefit are by considerable.
The Land use systems of pressure energy of natural gas mainly has generating and refrigeration two big classes at present.
One is to utilize high-pressure natural gas expansion driven electrical power generators.Gas typically to be preheated before natural gas expands by this technology, it is ensured that the temperature after natural gas expands exists
10
More than DEG C, thus prevent the condensation vapor in natural gas.Two is to utilize high-pressure natural gas to expand cooling, it is thus achieved that cold energy, is used for freezing, cools down or the aspect such as freezing.
By the retrieval to domestic and international existing patent, the most published patent utilizing pressure energy of natural gas, representative includes:
United States Patent (USP) (
US20090272115A1
) disclose one and utilize decompressor output mechanical power to drive integral shaft generator generating, but this patent is not directed to the utilization of cryogenic natural gas cold energy.United States Patent (USP) (
CN1179198A
), provide one and " utilize equipment and the method for overpressure generating in natural gas line ", filling the container of liquid by the body that makes to calm the anger flowing into be positioned at, gas can replace a part of liquid in container, and the buoyancy of generation can make storage tank move upward and make buoyancy be converted into rotation energy.China's patent (
CN 101245956A
) disclose a kind of universality method utilizing pressure energy of natural gas to freeze.China's patent (
CN101852529 A
) disclosing a kind of method and device utilizing natural gas pipe network pressure energy efficiently to utilize, the method relate to a kind of pressure energy refrigeration for freezer and cooling water air conditioner technique.China's patent (
CN102383870A
) disclosing one " natural gas pressure difference generating system of self adaptation back-end load change ", it includes load auto by pass lowering and stabilizing blood pressure system and natural gas pressure difference generating system.
Above patent majority is that patent institute extracting method more theorizes simultaneously for generating or a certain individual event purposes of freezing, and belongs to natural gas pressure difference applicable principle thinking and method, specifically can technical patent practical, that relate to pressure difference energy comprehensive utilization the rarest.
Therefore, it is necessary to for the problems referred to above and existing industrial requirement, exploitation can more make full use of natural gas pressure difference energy, adapt to the plurality of energy supplies demands such as generating cooling, environmental protection efficient natural gas pressure difference energy utilization device and technology.
Summary of the invention:
It is an object of the invention to provide a kind of natural gas pressure difference generating and cascaded utilization of energy coupled system and using method.
Above-mentioned purpose is realized by following technical scheme:
A kind of natural gas pressure difference generating and cascaded utilization of energy coupled system, its composition includes: natural gas pressure difference energy cold electricity recovery group, described natural gas pressure difference energy cold electricity recovery group is made up of the natural gas pressure difference energy of single-stage or plural serial stage cold electricity retracting device, described natural gas pressure difference energy cold electricity recovery group is connected with steam turbine, described steam turbine is connected with cogeneration machine and boiler, described boiler is connected by booster pump electricity cold with described natural gas pressure difference energy recovery group, and described boiler is also connected with gas turbine.
nullDescribed natural gas pressure difference generating and cascaded utilization of energy coupled system，Described natural gas pressure difference energy cold electricity retracting device includes natural gas turbines decompressor、Natural gas pressure difference electromotor and heat exchange gas device，Described natural gas turbines decompressor is all connected with described natural gas pressure difference electromotor and described heat exchange gas device，Described heat exchange gas device is connected with described steam turbine or described booster pump，Described gas turbine includes turbine、Compressor and combustor，Described natural gas turbines decompressor is provided with high-pressure natural gas entrance and low pressure natural gas outlet，Described natural gas turbines decompressor is internally provided with turbine wheel shaft magnet rotor，Outer magnet rotor and interior magnet rotor it is arranged with outside described turbine wheel shaft magnet rotor，It is provided with isolating seal set between described outer magnet rotor and described interior magnet rotor，Described natural gas pressure difference electromotor is provided with one group of radial air bearing and one group of thrust air bearing，Described radial air bearing and described thrust air bearing all coordinate with the p-m rotor being arranged in described natural gas pressure difference electromotor，Described p-m rotor is adaptive with the permanent magnetism stator being arranged in described natural gas pressure difference electromotor.
Described natural gas pressure difference generating and the using method of cascaded utilization of energy coupled system, high-pressure natural gas enters the natural gas turbines expander acting in natural gas pressure difference energy cold electricity retracting device, drive natural gas pressure difference electrical power generators, natural gas blood pressure lowering simultaneously is lowered the temperature, output low-pressure low-temperature natural gas, may be used for the generating of further expansion work, also high-pressure natural gas heat exchanger can directly be passed through, for power set or other equipment offer cooling needing low-temperature receiver and cooling, so natural gas pressure difference energy cold electricity retracting device can complete extraction and the utilization of natural gas pressure difference energy, for generating and cooling, can also be according to gas pressure height and actually used demand, the mode of single-stage or plural serial stage is used to use cold for natural gas pressure difference energy electricity retracting device；Can also be according to the demand of energy supply, simplicity flexibly by it together with other energy source and power equipment coupling integrations, build the coupling circulation system of the equipment such as natural gas pressure difference apparatus for utilizing energy and gas turbine, boiler and steam turbine, play the advantage of cascaded utilization of energy, it is achieved the energy regenerating of environmental protection and utilization；During coupling circulation system work, high-pressure natural gas enters the natural gas turbines decompressor of the first order natural gas pressure difference energy cold electricity retracting device in natural gas pressure difference energy cold electricity recovery group, expansion work drives natural gas pressure difference electrical power generators wherein, the natural gas flow of expansion cooling is through high-pressure natural gas heat exchanger, as the low-temperature receiver of heat exchanger；Afterwards, natural gas flows successively through the second level in natural gas pressure difference energy cold electricity recovery group, third level natural gas turbines decompressor in afterbody natural gas pressure difference energy cold electricity retracting device, finally export low pressure natural gas, realize the making full use of of energy of natural gas pressure difference, a part for low pressure natural gas supplies gas turbine as fuel, the combustion gas of gas turbine enters into heating condensate water in boiler and generates water vapour, water vapour enters in steam turbine and carries out expansion work, drive the generating of cogeneration machine, water vapour after expansion work successively flows through the high-pressure natural gas heat exchanger in natural gas pressure difference energy cold electricity recovery group successively, with the heat exchange gas after expansion, on the one hand this heat exchange utilizes the heat energy of water vapour to heat for natural gas, cryogenic natural gas is avoided to damage decompressor；On the other hand the cold energy utilizing natural gas cools down for water vapour, forms condensed water, and through booster pump, condensed water returns boiler.
Beneficial effect:
1.
The present invention may utilize the natural gas pressure difference energy in the case of low voltage situations and mesohigh, and when the natural gas pressure difference Energy harvesting pattern under low voltage situations works, generally, the natural gas from high pressure pipe network is about
2.8~6MPa
, temperature is about
5~6
℃.After this portion of natural gas enters pressure regulation distribution station, after the equipment such as control valve process, pressure is reduced to
0.4~0.6MPa
, temperature is about
2
About DEG C, subsequently into gas city planting ductwork, when carrying out natural gas pressure difference Energy harvesting in voltage regulating station when, owing to outlet pressure is low pressure, can directly use a natural gas pressure difference energy cold electricity retracting device, voltage regulating station natural gas is existed
2.8MPa
Arrive
0.6MPa
Between pressure can make full use of, utilize natural gas pressure difference to carry out expansion power generation, and the cold recovery after expanding, it is achieved pressure can " cold electricity reclaims "；nullWhen natural gas pressure difference Energy harvesting pattern in the case of mesohigh works，The pressure differential of increasing is there is in natural gas gas production and conveying between utilizing，Utilize decompressor can reclaim this partial pressure differential can generate electricity，But decline owing to natural gas expansion process there will be temperature，In order to keep natural gas temperature in expansion process to be unlikely to reducing excessive, decompressor is caused damage，Need to use staged expansion mode，Heated natural gas in expansion process simultaneously，Problem above for the natural gas pressure difference Energy harvesting in the case of mesohigh，This patent proposes the generating of a kind of natural gas pressure difference energy and the coupled system structure of cascaded utilization of energy，Use natural gas pressure difference energy cold electricity recovery group and the gas turbine of the cold electricity retracting device series connection formation of multiple natural gas pressure difference energy、Boiler、Steam turbine coupling integration coupling circulation system，This coupling circulation system utilizes the cold energy after natural gas expansion as gas turbine、Boiler、Combustion gas in turbine system、The cold end of water vapour circulation，Reduce combustion engine、Boiler、Water vapor condensation temperature in steam turbine cycle，Improve combustion engine、Boiler、The efficiency of steam turbine combined cycle；Utilize combustion gas, water vapour circulation heat energy as the hot junction of natural gas pressure difference energy utility system, heated natural gas is to avoid temperature in expansion process too low, this coupling cycle version, achieve the energy supply of various ways hot and cold, electric, and natural gas, combustion gas, the efficient circulation utilization of the multiple working medium of steam.
When natural gas turbines decompressor in the present invention and natural gas pressure difference electromotor coordinate, it is contemplated that the import and export parameter of natural gas, in conjunction with the use requirement of expander shaft system Yu turbine wheel, at rotating speed it is
5000~20000rpm
Slow-speed of revolution service condition under, choose the mode of single-stage or Multistage Axial Flow Turbines, it is achieved big flow, multilevel decompression use requirement, at rotating speed are
20000~60000rpm
High speed conditions under, the mode choosing radial turbine realizes the use requirement of big expansion ratio, medium-small flow；nullOwing to natural gas working medium has high pressure、Inflammable、The feature such as explosive，Conventional axle head seal form is (such as labyrinth、Comb、Brush teeth、Finger tips etc. seal) all it is difficult to realize the zero leakage sealing of gases at high pressure working medium，It is proposed that a kind of magnetic drives electromotor integral structure with isolating seal，Solution natural gas seals、Transmission and the problem of generating，This structure is by outer magnet rotor、The critical component compositions such as interior magnet rotor and non-magnetic isolating seal set，In single-stage and multistage turbine, natural gas expansion work process completes in isolating seal set inside，Natural gas can be completely enclosed outwardly reveal，Simultaneously，Natural gas expansion turbine drives turbine wheel shaft magnet rotor to rotate，By outer magnet rotor、The magnetic drives part of interior magnet rotor composition realizes power transmission，Interior magnet rotor and outer magnet rotor are tubular p-m rotor，Ensure that magnetic transmission system efficiency is high、Slippage is little，Transmission efficiency up to
90%
Above, mechanical energy through the output of magnetic synchronous actuating device, it is converted into electric energy output by high-speed permanent magnetic electromotor, high-speed permanent magnetic electromotor mainly includes generator permanent-magnet rotor, the assemblies such as generator permanent magnet stator, solve structure under conventional motors excitation mechanism complicated, efficiency is low, the problem that volume weight is big, p-m rotor uses radial air bearing and the supporting of thrust air bearing, realize the abrasion of bearing working state zero, complete machine service life and reliability is made to be greatly improved, there is rotating speed high, power density is big, torque is big, rotary inertia is little, the advantages such as volume weight is little.
The invention provides a kind of natural gas " green " differential pressure power generation and cascaded utilization of energy coupled system technology, compared with legacy system and technology, there is environmental protection, adaptability is high, integration is good, the features such as controllability is strong, construct natural gas pressure difference energy utility system and with the pattern of other form energy power system coupling integrations and method, achieve multiple types working medium, the systematization of many steps energy, functionalization efficient circulation and utilization, meet the energy source and power of environmental protection and the requirement of environmental conservation, can be additionally used in related process and the technology of fuel gas Energy harvesting in mineral diagram and oil shale recovery.
Accompanying drawing illustrates:
Accompanying drawing
1
It it is the structural representation of the present invention.
Accompanying drawing
2
It is natural gas turbines decompressor of the present invention and the magnetic drives electromotor integral structure schematic diagram of natural gas pressure difference electromotor cooperation.
Detailed description of the invention:
Embodiment
1
:
A kind of natural gas pressure difference generating and cascaded utilization of energy coupled system, its composition includes: natural gas pressure difference energy cold electricity recovery group
1
, described natural gas pressure difference energy cold electricity recovery group is by the natural gas pressure difference energy of single-stage or plural serial stage cold electricity retracting device
2
Composition, described natural gas pressure difference energy cold electricity recovery group and steam turbine
3
Connect, described steam turbine and cogeneration machine
4
And boiler
5
Connecting, described boiler passes through booster pump
6
Electricity recovery group cold with described natural gas pressure difference energy is connected, described boiler also with gas turbine
7
Connect.
Embodiment
2
:
According to embodiment
1
nullDescribed natural gas pressure difference generating and cascaded utilization of energy coupled system，Described natural gas pressure difference energy cold electricity retracting device includes natural gas turbines decompressor、Natural gas pressure difference electromotor and heat exchange gas device，Described natural gas turbines decompressor is all connected with described natural gas pressure difference electromotor and described heat exchange gas device，Described heat exchange gas device is connected with described steam turbine or described booster pump，Described gas turbine includes turbine、Compressor and combustor，Described natural gas turbines decompressor is provided with high-pressure natural gas entrance and low pressure natural gas outlet，Described natural gas turbines decompressor is internally provided with turbine wheel shaft magnet rotor，Outer magnet rotor and interior magnet rotor it is arranged with outside described turbine wheel shaft magnet rotor，It is provided with isolating seal set between described outer magnet rotor and described interior magnet rotor，Described natural gas pressure difference electromotor is provided with one group of radial air bearing and one group of thrust air bearing，Described radial air bearing and described thrust air bearing all coordinate with the p-m rotor being arranged in described natural gas pressure difference electromotor，Described p-m rotor is adaptive with the permanent magnetism stator being arranged in described natural gas pressure difference electromotor.
Embodiment
3
:
One utilizes embodiment
1
Or
2
Described natural gas pressure difference generating and the using method of cascaded utilization of energy coupled system, high-pressure natural gas enters the natural gas turbines expander acting in natural gas pressure difference energy cold electricity retracting device, drive natural gas pressure difference electrical power generators, natural gas blood pressure lowering simultaneously is lowered the temperature, output low-pressure low-temperature natural gas, may be used for the generating of further expansion work, also high-pressure natural gas heat exchanger can directly be passed through, for power set or other equipment offer cooling needing low-temperature receiver and cooling, so natural gas pressure difference energy cold electricity retracting device can complete extraction and the utilization of natural gas pressure difference energy, for generating and cooling, can also be according to gas pressure height and actually used demand, the mode of single-stage or plural serial stage is used to use cold for natural gas pressure difference energy electricity retracting device；Can also be according to the demand of energy supply, simplicity flexibly by it together with other energy source and power equipment coupling integrations, build the coupling circulation system of the equipment such as natural gas pressure difference apparatus for utilizing energy and gas turbine, boiler and steam turbine, play the advantage of cascaded utilization of energy, it is achieved the energy regenerating of environmental protection and utilization；During coupling circulation system work, high-pressure natural gas enters the natural gas turbines decompressor of the first order natural gas pressure difference energy cold electricity retracting device in natural gas pressure difference energy cold electricity recovery group, expansion work drives natural gas pressure difference electrical power generators wherein, the natural gas flow of expansion cooling is through high-pressure natural gas heat exchanger, as the low-temperature receiver of heat exchanger；Afterwards, natural gas flows successively through the second level in natural gas pressure difference energy cold electricity recovery group, third level natural gas turbines decompressor in afterbody natural gas pressure difference energy cold electricity retracting device, finally export low pressure natural gas, realize the making full use of of energy of natural gas pressure difference, a part for low pressure natural gas supplies gas turbine as fuel, the combustion gas of gas turbine enters into heating condensate water in boiler and generates water vapour, water vapour enters in steam turbine and carries out expansion work, drive the generating of cogeneration machine, water vapour after expansion work successively flows through the high-pressure natural gas heat exchanger in natural gas pressure difference energy cold electricity recovery group successively, with the heat exchange gas after expansion, on the one hand this heat exchange utilizes the heat energy of water vapour to heat for natural gas, cryogenic natural gas is avoided to damage decompressor；On the other hand the cold energy utilizing natural gas cools down for water vapour, forms condensed water, and through booster pump, condensed water returns boiler.
Claims (3)
1. a natural gas pressure difference generating and cascaded utilization of energy coupled system, its composition includes: natural gas pressure difference energy cold electricity recovery group, it is characterized in that: described natural gas pressure difference energy cold electricity recovery group is made up of the natural gas pressure difference energy of single-stage or plural serial stage cold electricity retracting device, described natural gas pressure difference energy cold electricity recovery group is connected with steam turbine, described steam turbine is connected with cogeneration machine and boiler, described boiler is connected by booster pump electricity cold with described natural gas pressure difference energy recovery group, and described boiler is also connected with gas turbine.
nullNatural gas pressure difference the most according to claim 1 generating and cascaded utilization of energy coupled system，It is characterized in that: described natural gas pressure difference energy cold electricity retracting device includes natural gas turbines decompressor、Natural gas pressure difference electromotor and heat exchange gas device，Described natural gas turbines decompressor is all connected with described natural gas pressure difference electromotor and described heat exchange gas device，Described heat exchange gas device is connected with described steam turbine or described booster pump，Described gas turbine includes turbine、Compressor and combustor，Described natural gas turbines decompressor is provided with high-pressure natural gas entrance and low pressure natural gas outlet，Described natural gas turbines decompressor is internally provided with turbine wheel shaft magnet rotor，Outer magnet rotor and interior magnet rotor it is arranged with outside described turbine wheel shaft magnet rotor，It is provided with isolating seal set between described outer magnet rotor and described interior magnet rotor，Described natural gas pressure difference electromotor is provided with one group of radial air bearing and one group of thrust air bearing，Described radial air bearing and described thrust air bearing all coordinate with the p-m rotor being arranged in described natural gas pressure difference electromotor，Described p-m rotor is adaptive with the permanent magnetism stator being arranged in described natural gas pressure difference electromotor.
3. one kind utilizes natural gas pressure difference according to claim 1 and 2 generating and the using method of cascaded utilization of energy coupled system, it is characterized in that: high-pressure natural gas enters the natural gas turbines expander acting in natural gas pressure difference energy cold electricity retracting device, drive natural gas pressure difference electrical power generators, natural gas blood pressure lowering simultaneously is lowered the temperature, output low-pressure low-temperature natural gas, may be used for the generating of further expansion work, also heat exchange gas device can directly be passed through, for power set or other equipment offer cooling needing low-temperature receiver and cooling, so natural gas pressure difference energy cold electricity retracting device can complete extraction and the utilization of natural gas pressure difference energy, for generating and cooling, can also be according to gas pressure height and actually used demand, the mode of single-stage or plural serial stage is used to use cold for natural gas pressure difference energy electricity retracting device；Can also be according to the demand of energy supply, simplicity flexibly by it together with other energy source and power equipment coupling integrations, build the coupling circulation system of the equipment such as natural gas pressure difference apparatus for utilizing energy and gas turbine, boiler and steam turbine, play the advantage of cascaded utilization of energy, it is achieved the energy regenerating of environmental protection and utilization；During coupling circulation system work, high-pressure natural gas enters the natural gas turbines decompressor of first the natural gas pressure difference energy cold electricity retracting device in natural gas pressure difference energy cold electricity recovery group, expansion work drives natural gas pressure difference electrical power generators wherein, the natural gas flow of expansion cooling is through heat exchange gas device, as the low-temperature receiver of heat exchanger；Afterwards, natural gas flows successively through the second level in natural gas pressure difference energy cold electricity recovery group, the third level is up to afterbody natural gas pressure difference energy cold electricity retracting device, finally export low pressure natural gas, realize the making full use of of energy of natural gas pressure difference, a part for low pressure natural gas supplies gas turbine as fuel, the combustion gas of gas turbine enters into heating condensate water in boiler and generates water vapour, water vapour enters in steam turbine and carries out expansion work, drive the generating of cogeneration machine, water vapour after expansion work successively flows through the high-pressure natural gas heat exchanger in natural gas pressure difference energy cold electricity recovery group successively, with the heat exchange gas after expansion, on the one hand this heat exchange utilizes the heat energy of water vapour to heat for natural gas, cryogenic natural gas is avoided to damage decompressor；On the other hand the cold energy utilizing natural gas cools down for water vapour, forms condensed water, and through booster pump, condensed water returns boiler.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106703919A (en) * | 2016-12-30 | 2017-05-24 | 中国科学院理化技术研究所 | Residual pressure and waste heat comprehensive utilization system for gas boiler room |
| CN106837438A (en) * | 2017-01-20 | 2017-06-13 | 中国科学院工程热物理研究所 | A kind of pressure energy of natural gas and cold energy combined recovery system of automobile and method |
| CN108757057A (en) * | 2018-06-13 | 2018-11-06 | 郑州朗润智能装备股份有限公司 | It can multigroup connection in series-parallel natural gas line differential pressure generating device |
| CN109506130A (en) * | 2018-12-28 | 2019-03-22 | 动能（北京）科技发展有限公司 | The energy recycle device and power generator of pressure difference energy when based on natural gas well gas production |
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| CN109506130A (en) * | 2018-12-28 | 2019-03-22 | 动能（北京）科技发展有限公司 | The energy recycle device and power generator of pressure difference energy when based on natural gas well gas production |
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