CN111504001B - Skid-mounted single-cycle mixed refrigeration natural gas liquefaction device and method - Google Patents
Skid-mounted single-cycle mixed refrigeration natural gas liquefaction device and method Download PDFInfo
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- CN111504001B CN111504001B CN201910099665.5A CN201910099665A CN111504001B CN 111504001 B CN111504001 B CN 111504001B CN 201910099665 A CN201910099665 A CN 201910099665A CN 111504001 B CN111504001 B CN 111504001B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 239000003345 natural gas Substances 0.000 title claims abstract description 40
- 238000005057 refrigeration Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003507 refrigerant Substances 0.000 claims abstract description 254
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 78
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 78
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 78
- 239000007789 gas Substances 0.000 claims abstract description 37
- 239000003949 liquefied natural gas Substances 0.000 claims description 80
- 239000012071 phase Substances 0.000 claims description 56
- 239000007791 liquid phase Substances 0.000 claims description 42
- 238000000926 separation method Methods 0.000 claims description 38
- 238000001816 cooling Methods 0.000 claims description 32
- 238000007906 compression Methods 0.000 claims description 23
- 230000006835 compression Effects 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 abstract description 10
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
- F25J1/0207—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as at least a three level SCR refrigeration cascade
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
- F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
- F25J1/0055—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream originating from an incorporated cascade
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0211—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
- F25J1/0212—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a single flow MCR cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
- F25J1/0259—Modularity and arrangement of parts of the liquefaction unit and in particular of the cold box, e.g. pre-fabrication, assembling and erection, dimensions, horizontal layout "plot"
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
- F25J1/0262—Details of the cold heat exchange system
- F25J1/0264—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
- F25J1/0265—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
- F25J1/0291—Refrigerant compression by combined gas compression and liquid pumping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
- F25J2220/64—Separating heavy hydrocarbons, e.g. NGL, LPG, C4+ hydrocarbons or heavy condensates in general
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/02—Internal refrigeration with liquid vaporising loop
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a skid-mounted single-cycle mixed refrigeration natural gas liquefaction device and a method, wherein the device comprises: a liquefaction skid and a refrigeration cycle skid. The device adopts a single-cycle refrigeration process, and the refrigeration and liquefaction energy consumption is 0.38kW.h/m3Compared with the common small-sized skid-mounted liquefying device, the energy consumption is 0.42kW.h/m3The reduction is more than 9.5 percent, and the liquefaction rate of the liquefaction process is 100 percent. The device also has the characteristics of suitability for various gas sources, simple process flow and low equipment investment. The device mainly comprises a liquefaction prying block and a refrigeration cycle prying block, wherein the liquefaction prying block mainly comprises a refrigerant separator, an LNG cold box, a heavy hydrocarbon separator and a heavy hydrocarbon heat exchanger, and the refrigeration cycle prying block mainly comprises a refrigerant suction tank and a refrigeration compressor.
Description
Technical Field
The invention belongs to the field of natural gas liquefaction, and particularly relates to a skid-mounted single-cycle mixed refrigeration natural gas liquefaction device and method.
Background
Liquefied natural gas is a clean energy source with high quality, high efficiency and convenience, and is becoming a new hotspot in the global energy market as it contributes to effectively developing natural gas resources, realizing diversification of energy supply and guaranteeing energy safety. Although the research in the LNG field is late, the development is rapid, particularly in the last decade, the construction of natural gas liquefaction plants in China enters the high-speed development stage, and more than 70 natural gas liquefaction plants are built, wherein more than 30 natural gas liquefaction plants in small and medium sizes are built. Because the device is huge, large-scale liquefied natural gas system is not convenient for in fields such as city peak regulation gas use, scattered gas field that the reserves are less and marginal gas field that the exploitation cost is higher, and china has marginal gas field, associated gas field, the coal bed gas field that the reserves of large volume are less, consequently need urgently to develop small-size sled dress formula natural gas liquefaction device so that these natural gas resources are effectively utilized, small-size sled dress formula natural gas liquefaction device is suitable for equally simultaneously, coal bed natural gas (gas), shale gas development utilizes etc. very wide market prospect. The device has great use value in development and utilization in China.
In recent years, small and medium-sized LNG liquefaction devices are developed more, such as SOOL LNG experimental devices developed by joint development of Jilin oil fields, China oil and gas general companies and China academy of sciences low-temperature centers; propane precooling and small natural gas liquefaction process schemes of expansion refrigeration and cyclic compression of a gas wave refrigerator which takes the gas wave refrigerator developed by the research and popularization center of large continuous gas wave refrigeration as a core, and the like. Meanwhile, the patent of partial small-sized skid-mounted LNG devices is formed, but the existing small-sized LNG skid-mounted devices have the defect of high energy consumption, and the contradiction that the energy consumption of the devices and the investment of the devices are considered simultaneously cannot be solved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: (1) the small skid-mounted liquefying device has the defect of high energy consumption; (2) complexity of the process; (3) the contradiction that the energy consumption of the device and the equipment investment cannot be simultaneously considered;
the invention provides a skid-mounted single-cycle mixed refrigeration natural gas liquefaction device, which comprises: a liquefaction skid block and a refrigeration cycle skid block;
the liquefaction sled piece includes:
a refrigerant separator for separating the refrigerant from the refrigerant,
the LNG cold box comprises a first hot runner, a second hot runner, a third hot runner and a cold runner, a purified gas inlet pipeline is connected with an inlet of the first hot runner, a gas-phase outlet and a liquid-phase outlet of the refrigerant separator are connected with an inlet of the cold runner, an outlet of the second hot runner is connected with an inlet of the refrigerant separator,
an inlet of the heavy hydrocarbon separator is connected with an outlet of the first hot runner, a gas phase outlet of the heavy hydrocarbon separator is connected with an inlet of a third hot runner of the LNG cold box, and an outlet of the third hot runner is connected with the LNG storage tank;
a heavy hydrocarbon heat exchanger which is provided with a cold runner, wherein a cold runner inlet of the heavy hydrocarbon heat exchanger is connected with a liquid phase outlet of the heavy hydrocarbon separator, a heat medium outlet of the heavy hydrocarbon heat exchanger is connected with a second hot runner inlet of the LNG cold box, an outlet of the cold runner of the heavy hydrocarbon heat exchanger is connected with a heavy hydrocarbon storage tank,
the refrigeration cycle pry block includes:
a refrigerant suction tank, the inlet of which is connected with the outlet of the cold runner of the LNG cold box,
at least one refrigerant compression cooling separation unit, the refrigerant compression cooling separation unit comprising: the device comprises a refrigerant compressor, a rear cooler of the refrigerant compressor and a rear separator of the refrigerant compressor, wherein an inlet of the refrigerant compressor is connected with a gas-phase outlet of a refrigerant suction tank, an inlet of the rear cooler of the refrigerant compressor is connected with an outlet of the refrigerant compressor, an inlet of the rear separator of the refrigerant compressor is connected with an outlet of the rear cooler of the refrigerant compressor, a gas-phase outlet of the rear separator of the refrigerant compressor is connected with an inlet of a second hot runner of an LNG cold box, and a liquid-phase outlet of the rear separator of a third-stage compressor of the refrigerant is connected with a hot medium inlet of a heavy hydrocarbon heat exchanger.
Preferably, the refrigerant compression cooling separation unit is multi-stage and is connected in series, a gas-phase outlet of a rear separator of a refrigerant compressor of the previous-stage refrigerant compression cooling separation unit is connected with an inlet of a refrigerant compressor of the next-stage refrigerant compression cooling separation unit, a gas-phase outlet of a rear separator of a refrigerant compressor of the last-stage refrigerant compression cooling separation unit is connected with an inlet of a second hot runner of the LNG cold box, and a liquid-phase outlet of a rear separator of a third-stage refrigerant compressor is connected with a hot medium inlet of the heavy hydrocarbon heat exchanger.
Preferably, the refrigerant compression cooling separation unit has three stages including:
the inlet of the first stage of refrigerant compressor is connected with the gas phase outlet of the refrigerant suction tank,
the inlet of the refrigerant first-stage compressor aftercooler is connected with the outlet of the refrigerant first-stage compressor,
the inlet of the refrigerant first-stage compressor after-separator is connected with the outlet of the refrigerant first-stage compressor after-cooler,
the inlet of the refrigerant second-stage compressor is connected with the gas-phase outlet of the separator behind the refrigerant first-stage compressor,
the inlet of the refrigerant second-stage compressor aftercooler is connected with the outlet of the refrigerant second-stage compressor,
the inlet of the refrigerant second-stage compressor rear separator is connected with the outlet of the refrigerant second-stage compressor rear cooler,
the inlet of the third stage of refrigerant compressor is connected with the gas phase outlet of the separator behind the second stage of refrigerant compressor,
the inlet of the refrigerant third-stage compressor aftercooler is connected with the outlet of the refrigerant third-stage compressor,
and the inlet of the rear separator of the third-stage refrigerant compressor is connected with the outlet of the rear separator of the second-stage refrigerant compressor and the outlet of the rear cooler of the third-stage refrigerant compressor, the gas-phase outlet of the rear separator of the third-stage refrigerant compressor is connected with the inlet of a second hot runner of the LNG cold box, and the liquid-phase outlet of the rear separator of the third-stage refrigerant compressor is connected with the hot medium inlet of the heavy hydrocarbon heat exchanger.
Preferably, the liquid phase outlet of the refrigerant suction tank and the liquid phase outlet of the refrigerant first-stage compressor after-separator are connected with an emptying system.
The invention also provides a method for liquefying natural gas by the skid-mounted single-cycle mixed refrigeration natural gas liquefying device, which comprises the following steps:
1) purified gas subjected to deacidification, drying and demercuration enters a first hot runner of an LNG (liquefied natural gas) cold box, is cooled in the LNG cold box and then enters a heavy hydrocarbon separator;
2) after gas-liquid separation is carried out in the heavy hydrocarbon separator, the gas-phase product enters a third hot runner of the LNG cold box to be cooled and liquefied into liquid, and then enters the LNG storage tank; the liquid phase product in the heavy hydrocarbon separator enters a cold runner of a heavy hydrocarbon heat exchanger;
3) heating liquid in a cold runner of the heavy hydrocarbon heat exchanger by a heat medium, and then feeding the heated liquid into an LNG storage tank;
liquid in a second hot runner of the LNG cold box enters a refrigerant separator, and a gas-phase product and a liquid-phase product of the refrigerant separator enter a cold runner of the LNG cold box; after heat exchange, refrigerant in a cold runner of the LNG cold box enters a refrigerant suction tank; the gas-phase product in the refrigerant suction tank enters a refrigerant compressor; after being compressed, the refrigerant enters a refrigerant compressor aftercooler; after cooling, the refrigerant enters a rear separator of a refrigerant compressor; after separation, a liquid-phase product of the separator after the refrigerant compressor enters a heat medium inlet of the heavy hydrocarbon heat exchanger to be used as a heat medium; the hot medium of the heavy hydrocarbon heat exchanger flows out to a second hot runner of the LNG cold box; and the gas-phase product of the separator after the refrigerant compressor enters a second hot runner of the LNG cold box.
Preferably, the method for liquefying natural gas by the skid-mounted single-cycle mixed refrigeration natural gas liquefaction device comprises the following steps:
1) purified gas subjected to deacidification, drying and demercuration enters a first hot runner of an LNG (liquefied natural gas) cold box, is cooled in the LNG cold box and then enters a heavy hydrocarbon separator;
2) after gas-liquid separation is carried out in the heavy hydrocarbon separator, the gas-phase product enters a third hot runner of the LNG cold box to be cooled and liquefied into liquid, and then enters the LNG storage tank; the liquid phase product in the heavy hydrocarbon separator enters a cold runner of a heavy hydrocarbon heat exchanger;
3) heating liquid in a cold runner of the heavy hydrocarbon heat exchanger by a heat medium, and then feeding the heated liquid into a heavy hydrocarbon storage tank;
the gas-phase product in the refrigerant suction tank enters a refrigerant first-stage compressor; after being compressed, the refrigerant enters a first-stage compressor aftercooler of the refrigerant; after cooling, the refrigerant enters a rear separator of a first-stage compressor of the refrigerant; after separation, the gas-phase product of the separator after the first-stage compressor enters a refrigerant second-stage compressor; after being compressed, the refrigerant enters a secondary refrigerant compressor aftercooler; after cooling, the refrigerant enters a secondary refrigerant compressor and a post-separator; after separation, a gas-phase product of the separator after the refrigerant second-stage compressor enters a refrigerant third-stage compressor, and a liquid-phase product enters the separator after the refrigerant third-stage compressor; after being compressed, the gas-phase product of the refrigerant second-stage compressor rear separator enters a refrigerant third-stage compressor rear separator; after separation, the liquid phase product of the separator after the third-stage compressor of the refrigerant enters a heat medium inlet of the heavy hydrocarbon heat exchanger to be used as a heat medium; the hot medium of the heavy hydrocarbon heat exchanger flows out to a second hot runner of the LNG cold box; and the gas-phase product of the separator after the third-stage compressor of the refrigerant enters a second hot runner of the LNG cold box.
Preferably, the liquid phase outlet of the refrigerant suction tank and the liquid phase outlet of the refrigerant first-stage compressor after-separator are connected with an emptying system.
Preferably, the purified gas in the step 1) enters a first hot runner of an LNG cold box, is cooled to-50 to-70 ℃ in the LNG cold box and then enters a heavy hydrocarbon separator.
Preferably, the pressure of the suction end of the inlet of the first-stage refrigerant compressor is 0.17MPa, and the suction temperature is 30-45 ℃; the refrigerant pressure at the outlet of the refrigerant third stage compressor was 4.0MPa, and the temperature was 50 ℃.
Preferably, after being cooled to-145 to-162 ℃, the refrigerant in the second hot runner is reduced to-148 to-165 ℃ by throttling and then enters the refrigerant separator.
The invention can achieve the following effects:
the invention relates to a skid-mounted single-cycle mixed refrigeration natural gas liquefaction device and a method, wherein the device adopts a single-cycle refrigeration process, and the refrigeration and liquefaction energy consumption is 0.38kW.h/m3Compared with the common small-sized skid-mounted liquefying device, the energy consumption is 0.42kW.h/m3The reduction is over 9.5 percent, and the liquefaction rate of the liquefaction process is 96.5 percent. The device also has the characteristics of suitability for various gas sources, simple process flow and low equipment investment. The device mainly includes liquefaction sled piece I and mixed cryogen refrigeration sled piece II, and wherein the liquefaction sled piece mainly includes cryogen separator, LNG cold box, heavy hydrocarbon separator, heavy hydrocarbon heat exchanger, and mixed cryogen refrigeration sled piece mainly includes cryogen suction tank and compressor.
Drawings
FIG. 1 is a schematic diagram of the skid-mounted single cycle mixed refrigeration natural gas liquefaction plant of the present invention.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
As shown in fig. 1, the skid-mounted single-cycle mixed refrigeration natural gas liquefaction device of the invention comprises: a liquefaction skid block and a refrigeration cycle skid block;
the liquefaction sled piece includes:
the refrigerant separator (1) is provided with a refrigerant separator,
an LNG cold box 2 which comprises a first hot runner, a second hot runner, a third hot runner and a cold runner, wherein a purified gas inlet pipeline is connected with an inlet of the first hot runner, a gas-phase outlet and a liquid-phase outlet of a refrigerant separator 1 are connected with an inlet of the cold runner (beneficial to heat exchange in the cold box), an outlet of the second hot runner is connected with an inlet of the refrigerant separator 1,
an inlet of the heavy hydrocarbon separator 3 is connected with an outlet of the first hot runner, a gas-phase outlet of the heavy hydrocarbon separator 3 is connected with an inlet of a third hot runner of the LNG cold box 2, and an outlet of the third hot runner is connected with the LNG storage tank;
a heavy hydrocarbon heat exchanger 4 which is provided with a cold runner, the inlet of the cold runner of the heavy hydrocarbon heat exchanger 4 is connected with the liquid phase outlet of the heavy hydrocarbon separator 3, the outlet of the heat medium of the heavy hydrocarbon heat exchanger 4 is connected with the second hot runner inlet of the LNG cold box 2, the outlet of the cold runner of the heavy hydrocarbon heat exchanger 4 is connected with a heavy hydrocarbon storage tank,
the refrigeration cycle sled piece includes:
a refrigerant suction tank 5, the inlet of which is connected with the outlet of the cold runner of the LNG cold box 2,
at least one refrigerant compression cooling separation unit, the refrigerant compression cooling separation unit comprising: the LNG cold box comprises a refrigerant compressor, a refrigerant compressor aftercooler and a refrigerant compressor afterseparator, wherein an inlet of the refrigerant compressor is connected with a gas-phase outlet of a refrigerant suction tank 5, an inlet of the refrigerant compressor aftercooler is connected with an outlet of the refrigerant compressor, an inlet of the refrigerant compressor afterseparator is connected with an outlet of the refrigerant compressor aftercooler, a gas-phase outlet of the refrigerant compressor afterseparator is connected with an inlet of a second hot runner of the LNG cold box 2, and a liquid-phase outlet of the refrigerant tertiary compressor afterseparator is connected with a hot medium inlet of the heavy hydrocarbon heat exchanger 4.
The refrigerant compression, cooling and separation units are not limited in the invention and can be connected in a multi-stage series manner, the gas-phase outlet of the rear separator of the refrigerant compressor of the former stage of refrigerant compression, cooling and separation unit is connected with the inlet of the refrigerant compressor of the latter stage of refrigerant compression, cooling and separation unit, the gas-phase outlet of the rear separator of the refrigerant compressor of the last stage of refrigerant compression, cooling and separation unit is connected with the inlet of the second hot runner of the LNG cold box 2, and the liquid-phase outlet of the rear separator of the third stage of refrigerant compressor is connected with the hot medium inlet of the heavy hydrocarbon heat exchanger 4.
As shown in fig. 1, an embodiment of the present invention takes a refrigerant compression cooling separation unit as an example with three stages, including:
a first stage compressor 6 of refrigerant, the inlet of which is connected with the gas phase outlet of the refrigerant suction tank 5,
an inlet of the refrigerant first stage compressor aftercooler 7 is connected with an outlet of the refrigerant first stage compressor 6,
an inlet of the refrigerant first-stage compressor afterseparator 8 is connected with an outlet of the refrigerant first-stage compressor aftercooler 7,
an inlet of the refrigerant second-stage compressor 9 is connected with a gas-phase outlet of the refrigerant first-stage compressor rear separator 8,
an inlet of the refrigerant second stage compressor aftercooler 10 is connected with an outlet of the refrigerant second stage compressor 9,
an inlet of the refrigerant second stage compressor afterseparator 11 is connected with an outlet of the refrigerant second stage compressor aftercooler 10,
the inlet of the third stage compressor 12 of refrigerant is connected with the gas phase outlet of the separator 11 after the second stage compressor of refrigerant,
a refrigerant third stage compressor aftercooler 13, the inlet of which is connected with the outlet of the refrigerant third stage compressor 12,
and an inlet of the refrigerant third-stage compressor rear separator 14 is connected with an outlet of the refrigerant second-stage compressor rear separator 11 and an outlet of the refrigerant third-stage compressor rear cooler 13, a gas-phase outlet of the refrigerant third-stage compressor rear separator 14 is connected with an inlet of a second hot runner of the LNG cold box 2, and a liquid-phase outlet of the refrigerant third-stage compressor rear separator 14 is connected with a heat medium inlet of the heavy hydrocarbon heat exchanger 4.
The liquid phase outlet of the refrigerant suction tank 5 and the liquid phase outlet of the refrigerant first-stage compressor rear separator 8 are connected with a venting system.
According to a preferred embodiment of the present invention, a skid-mounted single cycle mixed refrigeration natural gas liquefaction plant natural gas liquefaction process comprises the steps of:
1) the purified gas (the purified gas can also be called as purified natural gas), which is deacidified, dried and demercurated in the petroleum and natural gas industry, the technological process of deacidification, dehydration, demercuration and the like of the raw material natural gas is called as natural gas purification, the treated natural gas can be called as purified natural gas), the purified gas enters a first hot runner of an LNG (liquefied natural gas) cooling box 2, and the treated natural gas enters a heavy hydrocarbon separator 3 (the temperature is-60 ℃ in the conventional way, and is determined according to the content of C5+ in the raw material natural gas) after being cooled to-60 ℃ in the LNG cooling box 2;
2) after gas-liquid separation is carried out in the heavy hydrocarbon separator 3, the gas-phase product enters a third hot runner of the LNG cold box 2 to be cooled and liquefied into liquid, and then enters an LNG storage tank; the liquid phase product in the heavy hydrocarbon separator 3 enters a cold runner of a heavy hydrocarbon heat exchanger 4;
3) heating the liquid in the cold runner of the heavy hydrocarbon heat exchanger 4 by a heat medium, and then feeding the heated liquid into a heavy hydrocarbon storage tank;
the gas-phase product in the refrigerant suction tank 5 enters a refrigerant first-stage compressor 6; after being compressed, the refrigerant enters a refrigerant first-stage compressor aftercooler 7; after cooling, the refrigerant enters a refrigerant first-stage compressor rear separator 8; after separation, the gas phase product of the separator after the first-stage compressor enters a refrigerant second-stage compressor 9; after being compressed, the refrigerant enters a secondary refrigerant compressor aftercooler 10; after cooling, the refrigerant enters a secondary refrigerant compressor and a post-separator 11; after separation, a gas-phase product of the separator 11 after the refrigerant second-stage compressor enters the refrigerant third-stage compressor 12, and a liquid-phase product enters the separator 14 after the refrigerant third-stage compressor; after being compressed, the gas-phase product of the separator 11 after the second-stage compressor of the refrigerant enters a separator 14 after the third-stage compressor of the refrigerant; after separation, the liquid phase product of the separator 14 after the third-stage compressor of the refrigerant enters a heat medium inlet of the heavy hydrocarbon heat exchanger 4 to be used as a heat medium; the heat medium of the heavy hydrocarbon heat exchanger 4 flows out to a second hot runner of the LNG cold box 2; the gas-phase product of the separator 14 after the third-stage compressor of the refrigerant enters a second hot runner of the LNG cold box 2; after being cooled to-145 ℃, the refrigerant in the second hot runner is reduced to-148 ℃ by throttling and then enters the refrigerant separator 1. The pressure of the suction end of the first-stage refrigerant compressor 6 is 0.17MPa, and the suction temperature is 35 ℃; the refrigerant pressure at the outlet of the refrigerant third stage compressor 12 is 4.0MPa, and the temperature is 50 ℃.
The liquid phase outlet of the refrigerant suction tank 5 and the liquid phase outlet of the refrigerant first-stage compressor rear separator 8 are connected with a venting system.
In the above embodiments of the present invention:
the energy consumption of refrigeration and liquefaction is 0.38kW.h/m3Compared with the common small-sized skid-mounted liquefying device, the energy consumption is 0.42kW.h/m3The reduction is more than 9.5 percent, and the liquefaction rate of the liquefaction process is 100 percent.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The utility model provides a sled dress formula single cycle mixes refrigeration natural gas liquefaction device which characterized in that includes: a liquefaction skid block and a refrigeration cycle skid block;
the liquefaction sled piece includes:
a refrigerant separator for separating the refrigerant from the refrigerant,
the LNG cold box comprises a first hot runner, a second hot runner, a third hot runner and a cold runner, a purified gas inlet pipeline is connected with an inlet of the first hot runner, a gas-phase outlet and a liquid-phase outlet of the refrigerant separator are connected with an inlet of the cold runner, an outlet of the second hot runner is connected with an inlet of the refrigerant separator,
an inlet of the heavy hydrocarbon separator is connected with an outlet of the first hot runner, a gas phase outlet of the heavy hydrocarbon separator is connected with an inlet of a third hot runner of the LNG cold box, and an outlet of the third hot runner is connected with the LNG storage tank;
a heavy hydrocarbon heat exchanger which is provided with a cold runner, wherein a cold runner inlet of the heavy hydrocarbon heat exchanger is connected with a liquid phase outlet of the heavy hydrocarbon separator, a heat medium outlet of the heavy hydrocarbon heat exchanger is connected with a second hot runner inlet of the LNG cold box, an outlet of the cold runner of the heavy hydrocarbon heat exchanger is connected with a heavy hydrocarbon storage tank,
the refrigeration cycle pry block includes:
a refrigerant suction tank, the inlet of which is connected with the outlet of the cold runner of the LNG cold box,
at least one refrigerant compression cooling separation unit, the refrigerant compression cooling separation unit comprising: the LNG cold box comprises a refrigerant compressor, a refrigerant compressor aftercooler and a refrigerant compressor afterseparator, wherein an inlet of the refrigerant compressor is connected with a gas-phase outlet of a refrigerant suction tank, an inlet of the refrigerant compressor aftercooler is connected with an outlet of the refrigerant compressor, an inlet of the refrigerant compressor afterseparator is connected with an outlet of the refrigerant compressor aftercooler, a gas-phase outlet of the refrigerant compressor afterseparator is connected with an inlet of a second hot runner of the LNG cold box, and a liquid-phase outlet of the refrigerant compressor afterseparator is connected with a hot medium inlet of a heavy hydrocarbon heat exchanger.
2. The skid-mounted single-cycle mixed refrigeration natural gas liquefaction device according to claim 1, wherein the refrigerant compression cooling separation unit is multi-stage and is connected in series, a gas phase outlet of a rear separator of a refrigerant compressor of a previous stage refrigerant compression cooling separation unit is connected to an inlet of a refrigerant compressor of a subsequent stage refrigerant compression cooling separation unit, a gas phase outlet of a rear separator of a refrigerant compressor of a last stage refrigerant compression cooling separation unit is connected to an inlet of a second hot runner of the LNG cold box, and a liquid phase outlet of the rear separator of the refrigerant compressor of the last stage refrigerant compression cooling separation unit is connected to a hot medium inlet of the heavy hydrocarbon heat exchanger.
3. The skid-mounted single cycle mixed refrigeration natural gas liquefaction plant of claim 1, wherein the refrigerant compression cooling separation unit is three-stage comprising:
the inlet of the first stage of refrigerant compressor is connected with the gas phase outlet of the refrigerant suction tank,
the inlet of the refrigerant first-stage compressor aftercooler is connected with the outlet of the refrigerant first-stage compressor,
the inlet of the refrigerant first-stage compressor after-separator is connected with the outlet of the refrigerant first-stage compressor after-cooler,
the inlet of the refrigerant second-stage compressor is connected with the gas-phase outlet of the separator behind the refrigerant first-stage compressor,
the inlet of the refrigerant second-stage compressor aftercooler is connected with the outlet of the refrigerant second-stage compressor,
the inlet of the refrigerant second-stage compressor rear separator is connected with the outlet of the refrigerant second-stage compressor rear cooler,
the inlet of the third stage of refrigerant compressor is connected with the gas phase outlet of the separator behind the second stage of refrigerant compressor,
the inlet of the refrigerant third-stage compressor aftercooler is connected with the outlet of the refrigerant third-stage compressor,
and the inlet of the rear separator of the third-stage refrigerant compressor is connected with the outlet of the rear separator of the second-stage refrigerant compressor and the outlet of the rear cooler of the third-stage refrigerant compressor, the gas-phase outlet of the rear separator of the third-stage refrigerant compressor is connected with the inlet of a second hot runner of the LNG cold box, and the liquid-phase outlet of the rear separator of the third-stage refrigerant compressor is connected with the hot medium inlet of the heavy hydrocarbon heat exchanger.
4. The skid-mounted single-cycle mixed refrigeration natural gas liquefaction device according to any one of claims 1 to 3, wherein a liquid phase outlet of the refrigerant suction tank and a liquid phase outlet of a refrigerant first-stage compressor post-separator are connected with an emptying system.
5. The method of liquefying natural gas for a skid-mounted single cycle mixed refrigeration natural gas liquefaction plant of claim 1, comprising the steps of:
1) purified gas subjected to deacidification, drying and demercuration enters a first hot runner of an LNG (liquefied natural gas) cold box, is cooled in the LNG cold box and then enters a heavy hydrocarbon separator;
2) after gas-liquid separation is carried out in the heavy hydrocarbon separator, the gas-phase product enters a third hot runner of the LNG cold box to be cooled and liquefied into liquid, and then enters the LNG storage tank; the liquid phase product in the heavy hydrocarbon separator enters a cold runner of a heavy hydrocarbon heat exchanger;
3) heating liquid in a cold runner of the heavy hydrocarbon heat exchanger by a heat medium, and then feeding the heated liquid into a heavy hydrocarbon storage tank;
liquid in a second hot runner of the LNG cold box enters a refrigerant separator, and a gas-phase product and a liquid-phase product of the refrigerant separator enter a cold runner of the LNG cold box; after heat exchange, refrigerant in a cold runner of the LNG cold box enters a refrigerant suction tank; the gas-phase product in the refrigerant suction tank enters a refrigerant compressor; after being compressed, the refrigerant enters a refrigerant compressor aftercooler; after cooling, the refrigerant enters a rear separator of a refrigerant compressor; after separation, a liquid-phase product of the separator after the refrigerant compressor enters a heat medium inlet of the heavy hydrocarbon heat exchanger to be used as a heat medium; the hot medium of the heavy hydrocarbon heat exchanger flows out to a second hot runner of the LNG cold box; and the gas-phase product of the separator after the refrigerant compressor enters a second hot runner of the LNG cold box.
6. The method of liquefying natural gas for a skid-mounted single cycle mixed refrigeration natural gas liquefaction plant of claim 3, comprising the steps of:
1) purified gas subjected to deacidification, drying and demercuration enters a first hot runner of an LNG (liquefied natural gas) cold box, is cooled in the LNG cold box and then enters a heavy hydrocarbon separator;
2) after gas-liquid separation is carried out in the heavy hydrocarbon separator, the gas-phase product enters a third hot runner of the LNG cold box to be cooled and liquefied into liquid, and then enters the LNG storage tank; the liquid phase product in the heavy hydrocarbon separator enters a cold runner of a heavy hydrocarbon heat exchanger;
3) heating liquid in a cold runner of the heavy hydrocarbon heat exchanger by a heat medium, and then feeding the heated liquid into a heavy hydrocarbon storage tank;
the gas-phase product in the refrigerant suction tank enters a refrigerant first-stage compressor; after being compressed, the refrigerant enters a first-stage compressor aftercooler of the refrigerant; after cooling, the refrigerant enters a rear separator of a first-stage compressor of the refrigerant; after separation, the gas-phase product of the separator after the first-stage compressor enters a refrigerant second-stage compressor; after being compressed, the refrigerant enters a secondary refrigerant compressor aftercooler; after cooling, the refrigerant enters a secondary refrigerant compressor and a post-separator; after separation, a gas-phase product of the separator after the refrigerant second-stage compressor enters a refrigerant third-stage compressor, and a liquid-phase product enters the separator after the refrigerant third-stage compressor; after being compressed, the gas-phase product of the refrigerant second-stage compressor rear separator enters a refrigerant third-stage compressor rear separator; after separation, the liquid phase product of the separator after the third-stage compressor of the refrigerant enters a heat medium inlet of the heavy hydrocarbon heat exchanger to be used as a heat medium; the hot medium of the heavy hydrocarbon heat exchanger flows out to a second hot runner of the LNG cold box; and the gas-phase product of the separator after the third-stage compressor of the refrigerant enters a second hot runner of the LNG cold box.
7. The method of claim 6, wherein the liquid phase outlet of the refrigerant suction tank and the liquid phase outlet of the refrigerant first stage compressor post-separator are connected to a vent system.
8. The method as claimed in claim 6, wherein the purified gas in step 1) enters a first hot runner of an LNG cold box, is cooled to-50 to-70 ℃ in the LNG cold box, and then enters a heavy hydrocarbon separator.
9. The method according to claim 6, wherein the pressure at the suction end of the inlet of the refrigerant first stage compressor is 0.17MPa, and the suction temperature is 30-45 ℃; the refrigerant pressure at the outlet of the refrigerant third stage compressor was 4.0MPa, and the temperature was 50 ℃.
10. The method as claimed in claim 6, wherein the refrigerant in the second hot runner is cooled to-145 to-162 ℃, and then is throttled to-148 ℃ and enters the refrigerant separator.
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Effective date of registration: 20221123 Address after: 100027 Chaoyangmen North Street, Chaoyang District, Chaoyang District, Beijing Patentee after: SINOPEC Group Patentee after: SINOPEC OILFIELD SERVICE Corp. Patentee after: SINOPEC PETROLEUM ENGINEERING Corp. Address before: 100020 Building 2, Chaoyang Gate office area, Sinopec, 9 jishikou Road, Chaoyang District, Beijing Patentee before: SINOPEC OILFIELD SERVICE Corp. Patentee before: SINOPEC PETROLEUM ENGINEERING Corp. |