CN103075833B - Method for refrigerating by recycling pressure energy of natural gas pipeline network - Google Patents
Method for refrigerating by recycling pressure energy of natural gas pipeline network Download PDFInfo
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- CN103075833B CN103075833B CN201310015658.5A CN201310015658A CN103075833B CN 103075833 B CN103075833 B CN 103075833B CN 201310015658 A CN201310015658 A CN 201310015658A CN 103075833 B CN103075833 B CN 103075833B
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Abstract
The invention relates to a method for refrigerating by recycling pressure energy of a natural gas pipeline network. The method comprises the following steps of enabling the natural gas to enter a natural gas gate station from a high-pressure pipeline network, distributing flow, reducing the pressure and temperature of the natural gas by a primary gas wave refrigerator, and exchanging heat between the pressure-reduced low-temperature natural gas and a coolant of a heat exchanger; distributing flow for the temperature-raised natural gas, wherein part of natural gas entering a power station is used as a fuel, and the other part of natural gas entering a secondary gas wave refrigerator is subjected to pressure and temperature reducing treatment; exchanging heat between the pressure-reduced low-temperature natural gas and the coolant of the heat exchanger, and enabling the heat-exchanged natural gas to enter a pipeline network of a downstream city; and combing the coolants being subjected to heat exchange by the heat exchanger, using the coolants as a cooling agent, and enabling the cooling agent to enter a temperature reducing procedure of beer production by a flow meter. The method has the advantage that the heavy pressure of the natural gas in the pressure reducing process is converted into cold energy, the low-temperature natural gas exchanges cold with the coolants of the beer production in the heat exchanger, and the low-temperature coolants return back to a beer production system to reduce the temperature of the raw material, so the production requirements of energy saving and emission reduction are met.
Description
Technical field
The present invention relates to a kind of method recycling natural gas pipe network pressure energy refrigeration.
Background technology
Natural gas is a kind of high-quality, efficient, the clean energy.Global Developing Natural Gas Industry speed is very fast in recent decades, and the ratio of natural gas in world's primary energy structure also improves constantly.In gas industry, pipeline transportation natural gas is absolutely necessary link.Along with the development of technology, the gas transmission ability of gas distributing system and distribution pressure are constantly heightened, and pipeline gas is generally transported to terminal use in high pressure mode by long distance pipeline, afterwards, usually need to carry out step-down process by voltage adjusting device, to mate with gas facility.The immense pressure contained in natural gas can often be slatterned by release in vain in the process by pressure regulator valve pressure regulation, but also because natural gas is sharply lowered the temperature and to be constituted a threat to pressure regulation and pipe-line equipment security of operation.
Statement pressure energy of natural gas size can use e
x, prepresent.The pressure that the natural gas that pressure is 10MPa has is 603.9 kJ/kg.When the high-pressure natural gas that pressure is P1 is depressurized to P2 pressure, callable maximum pressure is:
。
The pressure energy of natural gas reclaimed can be used for generating, freezer, cooling water air conditioner, ice making, ice rink, air separation, Component seperation and the field such as to be separated with purification, dry ice production, rubber deep cooling crush and natural gas lighter hydrocarbons.The technology that pressure energy of natural gas freezes is utilized to comprise at present: (1) turbo-expander pressure recovery energy technology, by the step-down speed-raising in quiet nozzle ring runner of high-pressure natural gas expansion process kind, inject moving blades runner to flow out again, the change of the gateway moment of momentum makes air-flow do work to leaf grating, the kinetic energy of air-flow reduces, stagnation enthalpy declines, and reaches the object of externally acting and refrigeration.Advantage is that refrigerating efficiency is up to 70 ~ 80%.Shortcoming is complex structure, and manufacturing cost is high; Lubricating system is complicated, and operating maintenance bothers; Variable working condition bad adaptability, when inlet gas flow change exceed ± 20% time, significantly will affect the refrigerating efficiency of decompressor.(2) vortex tube pressure recovery energy technology, vortex tube is the simple energy separation device of a kind of structure.High pressure draught is in vortex tube during High Rotation Speed, the unequal two parts air-flow of stagnation temperature is separated into after eddy current conversion, the gas flow temperature being in centre is low, and the gas flow temperature being in outer position is high, regulate hot and cold stream ratio, best refrigeration effect can be obtained or heat effect, producing high temperature and low temperature two kinds of air-flows.The pressure of inlet gas is the sole power source of vortex tube work, and expansion ratio increases, and under identical cold flow rate, the cryogenic temperature effect of vortex tube significantly increases.Advantage does not have moving component, lightweight, and volume is little, and structure is simple, easy to operate, safe and reliable to operation, cheap.Shortcoming is that refrigerating efficiency is lower, and refrigerating efficiency is larger by the impact of inlet gas pressure, flow, can only be used for some specific occasions.
Summary of the invention
In order to overcome the weak point of the prior art of above-mentioned indication, the invention provides a kind of method recycling natural gas pipe network pressure energy refrigeration, so that can the immense pressure in natural gas pressure reduction be converted to cold energy, reaching the production requirement of energy-saving and emission-reduction.
The present invention is achieved by the following technical solutions:
Recycle a method for natural gas pipe network pressure energy refrigeration, comprise the following steps:
S1, natural gas enter natural valve station from high pressure pipe network, pressure is 6 ~ 9MPa, temperature is 10 ~ 25 DEG C, after high pressure pipe network natural gas in natural valve station is shunted, respectively through the step-down cooling process of one-level air wave refrigerating device, Pressure Drop to 2 ~ 4MPa, temperature are down to-80 ~-20 DEG C, cryogenic natural gas after step-down and the refrigerant heat exchange in heat exchanger, natural gas temperature is increased to 2 ~ 10 DEG C;
S2, to temperature raise after natural gas shunt, enter power station respectively as fuel, or enter secondary air wave refrigerating device and implement step-down cooling process, Pressure Drop to 0.3 ~ 1.0MPa, temperature are down to-80 ~-20 DEG C, cryogenic natural gas after step-down and the refrigerant heat exchange in heat exchanger, natural gas temperature is increased to 2 ~ 10 DEG C, enters downstream urban pipe network;
To enter the cooling process in Beer Brewage through measuring instrument as cooling agent after S3, the described refrigerant through heat exchanger heat exchange converge.
Further, described refrigerant adopts alcohol water blend or the gas phase NH of 25% ~ 35% mass fraction
3.Temperature before described refrigerant heat exchange is-5 ~ 5 DEG C, and the temperature after heat exchange is down to-30 ~-40 DEG C.
Further, described natural gas supply loop is configured with respectively the pressure regulator for subsequent use of one-level air wave refrigerating device and secondary air wave refrigerating device, 20 ~ 50 DEG C of cooling waters that this pressure regulator for subsequent use adopts power station to export carry out the refrigerant of heat exchange as with cryogenic natural gas.
Further, described heat exchanger is plate-fin heat exchanger.Described one-level air wave refrigerating device and secondary air wave refrigerating device are rotary air wave refrigerating device.
Compared with prior art, the present invention adopts air wave refrigerating device to carry out power conversion, and its refrigerating efficiency is high, and commercial Application can reach 70%; Energy-saving effect is obvious, and structure can be self-rotary, not power consumption, water, does not need external impetus to drive; Low price, equipment investment is low; Refrigerating part movement-less part; Have stronger adaptability to the change of the composition of import gases at high pressure, flow, pressure and expansion ratio, characteristic curve is smooth, and allow operation condition range large, the expansion ratio scope be suitable for is wide.The present invention adopts advanced " pressure energy/cold energy " switch technology efficiently, make the natural gas of different pressure can meet the supply of different user by classification step-down, can the immense pressure in natural gas pressure reduction be converted to cold energy, make cryogenic natural gas change cold with the refrigerant in Beer Brewage in heat exchanger, then low temperature refrigerant is returned Beer Brewage system raw material is lowered the temperature.Be supplied to heat exchanger relative in prior art carry out heat exchange by arranging natural gas hot water's boiler for producing hot water, more meet the production requirement of energy-saving and emission-reduction.
Accompanying drawing explanation
Accompanying drawing 1 is the realization flow schematic diagram of the method for recycling natural gas pipe network pressure energy refrigeration of the present invention.
Detailed description of the invention
For the ease of the understanding of those skilled in the art, below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, disclose a kind of method of recycling natural gas pipe network pressure energy refrigeration of embodiment, comprise the following steps:
S1, natural gas enter natural valve station from high pressure pipe network, pressure is 9MPa, temperature is 15 DEG C, high pressure pipe network natural gas in natural valve station is shunted, a part is through the step-down cooling process of one-level air wave refrigerating device one, Pressure Drop is down to-70 DEG C to 2.5MPa, temperature, the alcohol water blend refrigerant heat exchange of 30% mass fraction of 0 DEG C in the cryogenic natural gas after step-down and First Heat Exchanger, natural gas temperature is increased to 5 DEG C; Another part is through the step-down cooling process of one-level air wave refrigerating device two, Pressure Drop is down to-40 DEG C to 4.0MPa, temperature, the alcohol water blend refrigerant heat exchange of 30% mass fraction of 0 DEG C in the cryogenic natural gas after step-down and the second heat exchanger, natural gas temperature is increased to 5 DEG C;
S2, to temperature raise after natural gas shunt, Pressure Drop to whole power stations that enter of 2.5MPa as fuel, Pressure Drop enters power station to a part of 4.0MPa, another part enters secondary air wave refrigerating device step-down cooling process, Pressure Drop is down to-40 DEG C to 0.4MPa, temperature, the alcohol water blend refrigerant heat exchange of 30% mass fraction of 0 DEG C in the cryogenic natural gas after step-down and the 3rd heat exchanger, natural gas temperature is increased to 5 DEG C, enters downstream urban pipe network;
In S3, described first, second, and third heat exchanger, the refrigerant temperature of heat exchange is reduced to-35 DEG C, converges the rear cooling process entered through measuring instrument as cooling agent in Beer Brewage.
Air wave refrigerating device of the present invention is rotary air wave refrigerating device, is a kind of refrigeration plant utilizing the pressure energy of gas generation shock wave and dilatational wave to make gas refrigeration, also known as pressure wave refrigerator or heat separator.Its effect in refrigeration process and turbo-expander, choke valve are the same, are a kind of Gas Refrigerators.The thermal procession of this air wave refrigerating device pressure recovery energy is similar to decompressor, and the isentropic expansion process by gas obtains low temperature.Be with Piston Expander and turbo-expander difference, the machine that it is is groundwork element with wave (shock wave, dilatational wave), applicable admission pressure scope is 0.6 ~ 30.0MPa, and range of flow is 1.0 ~ 40.0 × 104m
3/ d, expansion ratio scope is 2 ~ 7.
Further, refrigerant of the present invention can adopt alcohol water blend or the gas phase NH of 25% ~ 35% mass fraction
3.Temperature before refrigerant heat exchange in described First Heat Exchanger and the second heat exchanger is-5 ~ 5 DEG C, and the temperature after heat exchange is down to-30 ~-40 DEG C, according to gas phase NH
3as refrigerant, then after the heat exchange, gas phase NH
3change into liquefied ammonia.The many links of beer production are cooling down operations, need a large amount of electric refrigerations.The cooling down operation of Beer Brewage system of the prior art normally utilizes screw-compression mechanism cold, take ammonia as refrigerant.And the present invention changes cold with the refrigerant (alcohol water blend as 30% mass fraction) from Beer Brewage system by cryogenic natural gas in heat exchanger, again low temperature alcohol water blend is returned Beer Brewage system to lower the temperature to raw material, solve natural gas simultaneously and heat up and beer cooling down operation.
Further, described natural gas supply loop configures respectively the pressure regulator for subsequent use of one-level air wave refrigerating device and secondary air wave refrigerating device, 20 ~ 50 DEG C of cooling waters that this pressure regulator for subsequent use adopts power station to export carry out the refrigerant of heat exchange as with cryogenic natural gas.When this one-level air wave refrigerating device and secondary air wave refrigerating device fault, pressure regulator for subsequent use carries out pressure regulation to the natural gas that enters the station, the temperature drop in the high-temperature cooling water reply pressure regulation process utilizing power station to export.
Further, first, second, and third heat exchanger of the present invention is plate-fin heat exchanger.
Above content is in conjunction with concrete preferred embodiment further description made for the present invention, should not assert that specific embodiment of the invention is confined to above explanation.For those skilled in the art, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, within the protection domain that the claim that all should be considered as being submitted to by the present invention is determined.
Claims (4)
1. recycle a method for natural gas pipe network pressure energy refrigeration, comprise the following steps:
s1, natural gas enters natural valve station from high pressure pipe network, pressure is 6 ~ 9MPa, temperature is 10 ~ 25 DEG C, after high pressure pipe network natural gas in natural valve station is shunted, respectively through the step-down cooling process of one-level air wave refrigerating device, Pressure Drop to 2 ~ 4MPa, temperature are down to-80 ~-20 DEG C, cryogenic natural gas after step-down and the refrigerant heat exchange in heat exchanger, natural gas temperature is increased to 2 ~ 10 DEG C;
s2, to temperature raise after natural gas shunt, enter power station respectively as fuel, or enter secondary air wave refrigerating device and implement step-down cooling process, Pressure Drop to 0.3 ~ 1.0MPa, temperature are down to-80 ~-20 DEG C, cryogenic natural gas after step-down and the refrigerant heat exchange in heat exchanger, described refrigerant adopts alcohol water blend or the gas phase NH3 of 25% ~ 35% mass fraction, temperature before refrigerant heat exchange is-5 ~ 5 DEG C, temperature after heat exchange is down to-40 ~-30 DEG C, natural gas temperature is increased to 2 ~ 10 DEG C, enters downstream urban pipe network;
s3, the described refrigerant through heat exchanger heat exchange to enter cooling process in Beer Brewage through measuring instrument as cooling agent after converging.
2. the method for recycling natural gas pipe network pressure energy refrigeration according to claim 1, it is characterized in that: described one-level air wave refrigerating device and secondary air wave refrigerating device are arranged on natural gas supply loop, and being configured with pressure regulator for subsequent use respectively, 20 ~ 50 DEG C of cooling waters that this pressure regulator for subsequent use adopts power station to export carry out the refrigerant of heat exchange as with cryogenic natural gas.
3. the method for recycling natural gas pipe network pressure energy refrigeration according to claim 1, is characterized in that: described heat exchanger is plate-fin heat exchanger.
4. the method for recycling natural gas pipe network pressure energy refrigeration according to claim 1, is characterized in that: described one-level air wave refrigerating device and secondary air wave refrigerating device are rotary air wave refrigerating device.
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Families Citing this family (5)
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| CN107810454B (en) * | 2015-06-25 | 2020-12-01 | 彼得罗菲奥伦蒂尼有限公司 | System and method for regulating the pressure of a gas |
| CN105626267A (en) * | 2016-01-08 | 2016-06-01 | 东莞新奥燃气有限公司 | Multi-generation natural gas power generation device and method |
| CN107940235B (en) | 2017-11-09 | 2018-10-16 | 大连理工大学 | Ultra-low temperature surroundings based on recycling incoming-flow pressure energy take hot day right controlled atmosphere temperature voltage-regulating system |
| DE102020004152A1 (en) | 2020-07-09 | 2022-01-13 | Technische Universität Dortmund | Process and device for the expansion of pressurized gases by means of an expansion machine using low-temperature heat sources |
| CN113389607B (en) * | 2021-06-08 | 2022-06-07 | 东南大学 | High-pressure pipe network pressure energy recovery system |
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| DE102004063841A1 (en) * | 2004-12-23 | 2006-07-13 | Rutger Dr.-Ing. Kretschmer | A method for combining a natural gas expansion system with an air conditioning cooler has pre- and post-heating of the gas and a control system for the output temperature |
| CN101245956A (en) * | 2008-03-25 | 2008-08-20 | 广州市煤气公司 | Method for utilizing pressure energy of natural gas |
| CN101551060A (en) * | 2009-04-30 | 2009-10-07 | 华南理工大学 | Method and device for integrated utilization of natural gas pipe network pressure energy refrigeration and hydrate |
| CN101852529A (en) * | 2010-05-28 | 2010-10-06 | 华南理工大学 | Method and device for efficient utilization of pressure energy of natural gas pipeline network |
| CN102563958A (en) * | 2011-12-13 | 2012-07-11 | 华南理工大学 | Method for generating power and making ice by aid of pressure energy of natural gas of pipe network and device |
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| US20090272115A1 (en) * | 2001-08-15 | 2009-11-05 | Vladimir Yaroslavovich Vasiliev | Method of Utilization of Gas Expansion Energy and Utilization Power Installation for Implementation of this Method |
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| DE102004063841A1 (en) * | 2004-12-23 | 2006-07-13 | Rutger Dr.-Ing. Kretschmer | A method for combining a natural gas expansion system with an air conditioning cooler has pre- and post-heating of the gas and a control system for the output temperature |
| CN101245956A (en) * | 2008-03-25 | 2008-08-20 | 广州市煤气公司 | Method for utilizing pressure energy of natural gas |
| CN101551060A (en) * | 2009-04-30 | 2009-10-07 | 华南理工大学 | Method and device for integrated utilization of natural gas pipe network pressure energy refrigeration and hydrate |
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