CN103968640A - Air separation system utilizing natural gas differential pressure power generation cold energy - Google Patents
Air separation system utilizing natural gas differential pressure power generation cold energy Download PDFInfo
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Abstract
The invention discloses an air separation system utilizing natural gas differential pressure power generation cold energy, and relates to the technical field of natural gas differential pressure power generation cold energy application. The air separation system utilizing the natural gas differential pressure power generation cold energy is designed to solve the problems that in the prior art, an air separation system is large in energy consumption and water consumption. The air separation system utilizing the natural gas differential pressure power generation cold energy comprises a natural gas differential pressure power generation system, an air separation device and a refrigerant circulation loop connected with the natural gas differential pressure power generation system and the air separation device. The refrigerant circulation loop is used for transporting cold energy generated by the natural gas differential pressure power generation system to the air separation device to be subjected to air cooling, and transporting absorbed heat in the air cooling process to the natural gas differential pressure power generation system to heat natural gas. According to the air separation system utilizing the natural gas differential pressure power generation cold energy, the high pressure natural gas pressure regulating power generation and the air separation device are combined, the cold energy generated through the natural gas pressure regulating power generation is fully utilized, investment and energy consumption of the air separation device are reduced, and energy consumption in the natural gas heating process is reduced.
Description
Technical field
The present invention relates to natural gas pressure difference generating cold energy applied technical field, relate in particular to a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy.
Background technology
Natural gas is a kind of clean energy resource that the whole world extensively adopts at present, for meeting the long needs apart from transport gas, need to add high pressure.China " the design distribution pressure of West-east Gas pipeline, capital, Shan line and two-wire system and Ji Ning interconnection gas pipeline has all reached 10MPa, the second west to east gas pipeline project pipeline, and design pressure can reach 12MPa.The high-pressure natural gas being transported by high pressure Trunk-line all needs to require to carry out step-down according to the supply gas pressure of downstream user in natural gas receiving gate station, the voltage regulating station in each city, then can be supplied to domestic consumer (as gas user, public commercial family etc.) to use.A transfer natural gas from the west to the east line, two wires pipeline pressure reaches 10 MPas and 12 MPas, need to carry out step-down and just can enter urban pipe network in the time arriving each urban gate station, and this process can discharge huge pressure energy.When natural gas enters low-pressure pipe network from high pressure pipe network, have the loss of very large pressure energy, according to measuring and calculating, taking the natural valve station of processing 50 ten thousand steres day as example, pressure energy loss power is down to 0.4 MPa from 4.0 MPas, and pressure energy is 3561KW.Along with the development of China's natural gas industry, being constructed and put into operation successively of transfering natural gas from the west to the east I line, II line, the year gas supply capacity of the I of wherein transferring natural gas from the west to the east line has exceeded 120 billion cubic meters, the year gas supply capacity of transfering natural gas from the west to the east II line design is 300 billion cubic meters, the natural gas loss causing due to supplementary pressure in high-pressure natural gas course of conveying if do not consider, it is recyclable 80,200,000,000 kilowatt hours that the I of only transferring natural gas from the west to the east line, II line 4.0MPa adjust this pressure rating of 1.6MPa, and it is larger that 10MPa is transferred to this pressure rating recoverable energy of 4MPa.
The mode that reclaims at present natural gas pipe network pressure energy is mainly generating and refrigeration two large classes.
Chinese patent CN101280723A discloses recoverying and utilizing method and the device of a kind of natural gas pipe network pressure energy in gas turbine acting field, cold airflow, thermal current that high-pressure natural gas is produced after vortex tube step-down are exported respectively, cold airflow, by absorbing in heat exchanger after the heat intensification of counter-flow air and combustion turbine exhaustion, converges with thermal current the combustion chamber that enters gas turbine group; The compressor that the air of being lowered the temperature by heat exchanger enters gas turbine group improves the combustion chamber that imports gas turbine group after pressure, and in combustion chamber, natural gas and air mixed combustion, make gas turbine acting, driving wasted work equipment.The present invention selects vortex tube to complete natural gas step-down pressure regulation process, and cryogenic natural gas is flowed to cooling press mechanism of qi intake air temperature, air-mass flow is increased, thereby can greatly improve exerting oneself and economy of gas turbine, makes pressure energy obtain effective utilization.
Chinese patent CN1407303A discloses a kind of air-separating plant that utilizes cold energy of liquefied natural gas, and it relates to the technology such as cold energy of liquefied natural gas utilization and air-separating plant.It is on the basis of existing air-separating plant, set up in the nitrogen being formed by multiple stage circulation nitrogen compressor, LNG heat exchanger, circulating nitrogen gas heat exchanger etc. the combined refrigeration system of circulation and nitrogen outer circulation, and the air cooling system being conducted heat by refrigerating medium condensation evaporation.The cold that it can make full use of liquefied natural gas low temperature comes the circulating nitrogen gas of cooling low temperature compression and normal temperature compressed air, the energy consumption of device is declined to a great extent, produce approximately 100,000,000 degree that economize on electricity in air-separating plant year of 330 tons of liquid oxygen, 300 tons of liquid nitrogen, 17 tons of liquid argons daily, and can save equipment and running cost thereof that liquefied natural gas is gasified.And, due to liquefied natural gas heat exchanger tube and compressed air loop are kept apart, ensure device security.
Except above-mentioned two patents, the technical scheme of the recovery natural gas pipe network pressure energy disclosing in prior art also has a lot, such as: publication number is the Chinese patent of CN101245956A, CN101852529B, CN102563958B, CN2791144Y and the United States Patent (USP) that publication number is US5137558.
But in technique scheme, only disclose to utilize and reclaimed natural gas pipe network pressure energy generating, refrigeration, or directly utilize recovery natural gas pipe network pressure energy to carry out air separation, the technical scheme that openly high-pressure natural gas pressure regulation generating and air-separating plant combine.
Summary of the invention
The object of the invention is to propose a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy, can make full use of natural gas pipe network pressure energy, and solved existing air-seperation system energy consumption, water consumes large problem.
For reaching this object, the present invention by the following technical solutions:
A kind of air-seperation system that utilizes natural gas pressure difference generating cold energy, comprise natural gas pressure difference generating system and air-separating plant, also comprise the refrigerant circulation circuit that connects described natural gas pressure difference generating system and described air-separating plant, described refrigerant circulation circuit is delivered to described air-separating plant for the cold energy that described natural gas pressure difference generating system is produced, and to carry out air cooling, and will carry out the heating of natural gas carrying out heat delivery to the described natural gas pressure difference generating system that air absorbs when cooling.
Preferably, described natural gas pressure difference generating system comprises the natural gas pressure regulating valve, natural gas expansion power generation unit and the natural gas refrigerant heat exchanger that connect successively by the road, the gas distributing system of the low one-level of gas outlet end Bonding pressure of described natural gas refrigerant heat exchanger;
Described refrigerant circulation circuit comprises described natural gas refrigerant heat exchanger and described air-separating plant.
Preferably, described air-separating plant comprises the air cleaner, air compressor, compressed air refrigerant heat exchanger, molecular sieve dehydration device, main heat exchanger, fractionating column and the gas collector that connect successively by the road;
Described main heat exchanger has an air intake and two air outlet slits, and one of them air outlet slit directly connects described fractionating column, and another air outlet slit connects described fractionating column through decompressor;
Described natural gas refrigerant heat exchanger and described compressed air refrigerant heat exchanger form described refrigerant circulation circuit.
Preferably, described air-separating plant also comprises the air refrigerant heat exchanger being arranged between described molecular sieve dehydration device and described main heat exchanger, and the described natural gas refrigerant heat exchanger, described air refrigerant heat exchanger and the described compressed air refrigerant heat exchanger that connect successively by the road form described refrigerant circulation circuit.
Preferably, described gas collector comprises the oxygen spherical tank, nitrogen spherical tank and the argon gas spherical tank that are connected with described fractionating column respectively;
Described oxygen spherical tank is connected with described fractionating column through oxygen compressor;
Described nitrogen spherical tank is connected with described fractionating column through nitrogen compressor.
Preferably, in described refrigerant circulation circuit, be provided with the refrigerant circulation pump for circulating refrigerant.
Preferably, described natural gas pressure difference generating system is natural gas pressure difference generating system or the star rotary gas pressure energy electricity generation system with decompressor.
Preferably, the refrigerant in described refrigerant circulation circuit is hydrocarbon or CFC.
Preferably, described natural gas expansion power generation unit comprises decompressor, reduction gear box, generator and petrol station.
Beneficial effect of the present invention is:
A kind of air-seperation system that utilizes natural gas pressure difference generating cold energy provided by the invention comprises natural gas pressure difference generating system, air-separating plant and connects the refrigerant circulation circuit of natural gas pressure difference generating system and air-separating plant, the cold energy that refrigerant circulation circuit produces natural gas pressure difference generating system is delivered to air-separating plant, be used for the cooling of its inner air, and by carrying out heat delivery that air absorbs when cooling to natural gas pressure difference generating system, for the heating of its inside natural gas.High-pressure natural gas pressure regulation generating is combined with air-separating plant, take full advantage of the natural gas pressure regulating cold energy producing that generates electricity, reduced investment and the energy consumption of air-separating plant, reduced the energy consumption of heating natural gas simultaneously.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy that the embodiment of the present invention one provides;
Fig. 2 is the structural representation of a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy that the embodiment of the present invention two provides.
In figure, 1, natural gas pressure regulating valve; 2, natural gas expansion power generation unit; 3, natural gas refrigerant heat exchanger; 4, air cleaner; 5, air compressor; 6, compressed air refrigerant heat exchanger; 7, molecular sieve dehydration device; 8, air refrigerant heat exchanger; 9, main heat exchanger; 10, decompressor; 11, fractionating column; 12, oxygen compressor; 13, nitrogen compressor; 14, oxygen spherical tank; 15, nitrogen spherical tank; 16, argon gas spherical tank; 17, user; 18, refrigerant circulation pump.
Detailed description of the invention
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing and by detailed description of the invention.
The invention provides a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy, comprise natural gas pressure difference generating system, air-separating plant and connect the refrigerant circulation circuit of described natural gas pressure difference generating system and described air-separating plant, the cold energy that refrigerant circulation circuit produces natural gas pressure difference generating system is delivered to air-separating plant, be used for the cooling of its inner air, and by carrying out heat delivery that air absorbs when cooling to natural gas pressure difference generating system, for the heating of its inside natural gas.High-pressure natural gas pressure regulation generating is combined with air-separating plant, take full advantage of the natural gas pressure regulating cold energy producing that generates electricity, reduced investment and the energy consumption of air-separating plant, reduced the energy consumption of heating natural gas simultaneously.
Embodiment mono-:
The present embodiment provides a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy, and as shown in Figure 1, natural gas pressure difference generating system comprises the natural gas pressure regulating valve 1, natural gas expansion power generation unit 2 and the natural gas refrigerant heat exchanger 3 that connect successively by the road.Wherein, the gas inlet end of natural gas refrigerant heat exchanger 3 connects natural gas expansion power generation unit 2, the gas distributing system of the low one-level of gas outlet end Bonding pressure.Natural gas expansion power generation unit 2 is mainly made up of decompressor, reduction gear box, generator and petrol station.Preferably, natural gas pressure difference generating system is star rotary gas pressure energy electricity generation system.
Air-separating plant comprises the air cleaner 4, air compressor 5, compressed air refrigerant heat exchanger 6, molecular sieve dehydration device 7, main heat exchanger 9, fractionating column 11 and the gas collector that connect successively by the road.Main heat exchanger 9 has an air intake and two air outlet slits, and one of them air outlet slit directly connects fractionating column 11, and another air outlet slit connects fractionating column 11 through decompressor 10.Gas collector comprises the oxygen spherical tank 14, nitrogen spherical tank 15 and the argon gas spherical tank 16 that are connected with fractionating column 11 respectively.Oxygen spherical tank 14 is connected with fractionating column 11 through oxygen compressor 12, and nitrogen spherical tank 15 is connected with fractionating column 11 through nitrogen compressor 13.
Natural gas refrigerant heat exchanger 3, compressed air refrigerant heat exchanger 6 and refrigerant circulation pump 18 form refrigerant circulation circuit.Refrigerant in refrigerant circulation circuit flows to: refrigerant entrance → natural gas refrigerant heat exchanger 3 of refrigerant exit → natural gas refrigerant heat exchanger 3 of refrigerant entrance → compressed air refrigerant heat exchanger 6 → compressed air refrigerant heat exchanger 6 of refrigerant exit → refrigerant circulation pump 18 → compressed air refrigerant heat exchanger 6 of natural gas refrigerant heat exchanger 3 → natural gas refrigerant heat exchanger 3.
The course of work of this system is: the high-pressure natural gas that pipe network comes enters natural gas expansion power generation unit 2 after by 1 voltage stabilizing of natural gas pressure regulating valve, first enter decompressor, promote decompressor impeller High Rotation Speed (reaching the most at a high speed 40000RPM) by pressure reduction, expander shaft connects reduction gear box, decelerate to 1500RPM and drive the generator generating being attached thereto, natural gas temperature after decompressor is reduced to the scope of-20 DEG C to-60 DEG C, natural gas after cooling enters in natural gas refrigerant heat exchanger 3 and carries out heat exchange with refrigerant, temperature is increased to the 0-10 DEG C of gas distributing system with enterprising low first class pressure, the lower refrigerant of temperature carrying out in natural gas refrigerant heat exchanger 3 after heat exchange is delivered to compressed air refrigerant heat exchanger 6 under the effect of refrigerant circulation pump 18, in compressed air refrigerant heat exchanger 6, carry out heat exchange with air, cold energy is transferred to air, air is lowered the temperature, refrigerant after intensification returns to that natural gas refrigerant heat exchanger 3 is interior to be heated natural gas, forms refrigerant circulation, air to be separated enters air compressor 5 after air cleaner 4 filters, air after pressurization heats up enters in compressed air refrigerant heat exchanger 6 and carries out heat exchange with refrigerant, air after heat exchange cooling enters molecular sieve dehydration device 7, air after dehydration enters main heat exchanger 9 and carries out deep cooling, an air part after deep cooling enters fractionating column 11 and separates, another part enters and enters fractionating column 11 after the interior swell refrigeration of decompressor 10 again and separate, isolate oxygen, nitrogen and argon gas, oxygen and nitrogen after oxygen compressor 12 and nitrogen compressor compression 13, enter oxygen spherical tank 14 respectively and nitrogen spherical tank 15 stores, argon gas directly enters argon gas spherical tank 16, each spherical tank is all connected to user 17.
Refrigerant in refrigerant circulation circuit can be selected the CFC such as hydrocarbon or dichlorodifluoromethane such as ethane, propane, butane, ethene or propylene.
Embodiment bis-:
The present embodiment provides a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy, as shown in Figure 2, its structure and embodiment mono-are basic identical, comprise natural gas pressure difference generating system, air-separating plant and connect the refrigerant circulation circuit of described natural gas pressure difference generating system and described air-separating plant, the cold energy that refrigerant circulation circuit produces natural gas pressure difference generating system is delivered to air-separating plant, be used for the cooling of its inner air, and by carrying out heat delivery that air absorbs when cooling to natural gas pressure difference generating system, for the heating of its inner natural gas.
Difference is, the air-separating plant of the present embodiment air-seperation system also comprises the air refrigerant heat exchanger 8 being arranged between molecular sieve dehydration device 7 and main heat exchanger 9, and the natural gas refrigerant heat exchanger 3, air refrigerant heat exchanger 8 and the compressed air refrigerant heat exchanger 6 that connect successively by the road form refrigerant circulation circuit.Refrigerant in refrigerant circulation circuit flows to: refrigerant entrance → natural gas refrigerant heat exchanger 3 of refrigerant exit → natural gas refrigerant heat exchanger 3 of refrigerant entrance → compressed air refrigerant heat exchanger 6 → compressed air refrigerant heat exchanger 6 of refrigerant exit → compressed air refrigerant heat exchanger 6 of refrigerant entrance → air refrigerant heat exchanger 8 → air refrigerant heat exchanger 8 of refrigerant exit → refrigerant circulation pump 18 → air refrigerant heat exchanger 8 of natural gas refrigerant heat exchanger 3 → natural gas refrigerant heat exchanger 3.
The course of work of this system and embodiment mono-are also basic identical, difference is, first the lower refrigerant of temperature carrying out in natural gas refrigerant heat exchanger 3 after heat exchange is delivered to air refrigerant heat exchanger 8 under the effect of refrigerant circulation pump 18, in air refrigerant heat exchanger 8, carry out heat exchange with air, and then enter in compressed air refrigerant heat exchanger 6 and carry out heat exchange with compressed air; And first air to be separated enters and carry out precooling in air refrigerant heat exchanger 8 after dehydration, then enter and in main heat exchanger 9, carry out deep cooling.Can utilize more fully the natural gas pressure regulating cold energy producing that generates electricity by this setup, further reduce investment and the energy consumption of air-separating plant.
Below described in conjunction with specific embodiments know-why of the present invention, these are described is in order to explain principle of the present invention, can not be interpreted as by any way limiting the scope of the invention.Based on explain herein, those skilled in the art does not need to pay performing creative labour can associate other detailed description of the invention of the present invention, within these modes all will fall into protection scope of the present invention.
Claims (8)
1. one kind is utilized the air-seperation system of natural gas pressure difference generating cold energy, comprise natural gas pressure difference generating system and air-separating plant, it is characterized in that: also comprise the refrigerant circulation circuit that connects described natural gas pressure difference generating system and described air-separating plant, described refrigerant circulation circuit is delivered to described air-separating plant for the cold energy that described natural gas pressure difference generating system is produced, and to carry out air cooling, and will carry out the heating of natural gas carrying out heat delivery to the described natural gas pressure difference generating system that air absorbs when cooling.
2. a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy according to claim 1, it is characterized in that: described natural gas pressure difference generating system comprises the natural gas pressure regulating valve (1), natural gas expansion power generation unit (2) and the natural gas refrigerant heat exchanger (3) that connect successively by the road, the gas distributing system of the low one-level of gas outlet end Bonding pressure of described natural gas refrigerant heat exchanger (3);
Described refrigerant circulation circuit comprises described natural gas refrigerant heat exchanger (3) and described air-separating plant.
3. a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy according to claim 2, is characterized in that: described air-separating plant comprises the air cleaner (4), air compressor (5), compressed air refrigerant heat exchanger (6), molecular sieve dehydration device (7), main heat exchanger (9), fractionating column (11) and the gas collector that connect successively by the road;
Described natural gas refrigerant heat exchanger (3) forms described refrigerant circulation circuit with described compressed air refrigerant heat exchanger (6).
4. a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy according to claim 3, it is characterized in that: described air-separating plant also comprises the air refrigerant heat exchanger (8) being arranged between described molecular sieve dehydration device (7) and described main heat exchanger (9), the described natural gas refrigerant heat exchanger (3), described air refrigerant heat exchanger (8) and the described compressed air refrigerant heat exchanger (6) that connect successively by the road form described refrigerant circulation circuit.
5. according to a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy described in claim 1 to 4 any one, it is characterized in that: in described refrigerant circulation circuit, be provided with the refrigerant circulation pump (18) for circulating refrigerant.
6. a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy according to claim 1, is characterized in that: described natural gas pressure difference generating system is with the natural gas pressure difference generating system of decompressor or star rotary gas pressure energy electricity generation system.
7. according to a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy described in claim 1 to 4 any one, it is characterized in that: the refrigerant in described refrigerant circulation circuit is hydrocarbon or CFC.
8. according to a kind of air-seperation system that utilizes natural gas pressure difference generating cold energy described in claim 2 to 4 any one, it is characterized in that: described natural gas expansion power generation unit (2) comprises decompressor, reduction gear box, generator and petrol station.
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| CN201410205448.7A CN103968640B (en) | 2014-05-15 | A kind of air-seperation system utilizing natural gas pressure difference generating cold energy |
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| CN201410205448.7A CN103968640B (en) | 2014-05-15 | A kind of air-seperation system utilizing natural gas pressure difference generating cold energy |
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| CN103968640A true CN103968640A (en) | 2014-08-06 |
| CN103968640B CN103968640B (en) | 2016-11-30 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104265381A (en) * | 2014-09-19 | 2015-01-07 | 碧海舟（北京）石油化工设备有限公司 | Natural gas pipeline network variable-voltage generation and cooling system and method |
| CN105823074A (en) * | 2016-05-06 | 2016-08-03 | 碧海舟（北京）节能环保装备有限公司 | Oxygen-enriched and energy-saving combustion system capable of achieving zero emission of nitrogen oxides |
| CN106369935A (en) * | 2016-10-27 | 2017-02-01 | 西南石油大学 | Air separation system and method utilizing pressure energy of high-pressure natural gas pipeline network |
| CN107702432A (en) * | 2017-11-06 | 2018-02-16 | 翁志远 | Gas preparation system and the system to be generated electricity using air separation and Preparation equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104265381A (en) * | 2014-09-19 | 2015-01-07 | 碧海舟（北京）石油化工设备有限公司 | Natural gas pipeline network variable-voltage generation and cooling system and method |
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| CN106369935A (en) * | 2016-10-27 | 2017-02-01 | 西南石油大学 | Air separation system and method utilizing pressure energy of high-pressure natural gas pipeline network |
| CN106369935B (en) * | 2016-10-27 | 2022-04-12 | 西南石油大学 | Air separation system and method utilizing pressure energy of high-pressure natural gas pipe network |
| CN107702432A (en) * | 2017-11-06 | 2018-02-16 | 翁志远 | Gas preparation system and the system to be generated electricity using air separation and Preparation equipment |
| CN107702432B (en) * | 2017-11-06 | 2024-02-09 | 翁志远 | Gas preparation system and system for generating electricity by using air separation and preparation equipment |
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