JPH08269469A - Recycle of natural gas liquefaction energy - Google Patents
Recycle of natural gas liquefaction energyInfo
- Publication number
- JPH08269469A JPH08269469A JP7075628A JP7562895A JPH08269469A JP H08269469 A JPH08269469 A JP H08269469A JP 7075628 A JP7075628 A JP 7075628A JP 7562895 A JP7562895 A JP 7562895A JP H08269469 A JPH08269469 A JP H08269469A
- Authority
- JP
- Japan
- Prior art keywords
- natural gas
- gas
- dry ice
- carbon dioxide
- lng
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 239000003345 natural gas Substances 0.000 title claims abstract description 25
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 88
- 239000007789 gas Substances 0.000 claims abstract description 37
- 235000011089 carbon dioxide Nutrition 0.000 claims abstract description 30
- 239000003949 liquefied natural gas Substances 0.000 claims abstract description 27
- 238000000859 sublimation Methods 0.000 claims abstract description 10
- 230000008022 sublimation Effects 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 29
- 239000001569 carbon dioxide Substances 0.000 claims description 29
- 238000001816 cooling Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000003786 synthesis reaction Methods 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 230000008016 vaporization Effects 0.000 description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 238000009834 vaporization Methods 0.000 description 4
- 239000013535 sea water Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000006200 vaporizer Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000013341 scale-up Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
- F25J1/0277—Offshore use, e.g. during shipping
- F25J1/0278—Unit being stationary, e.g. on floating barge or fixed platform
-
- 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
-
- 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
- F25J1/0027—Oxides of carbon, e.g. CO2
-
- 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
- F25J1/0221—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 the cold stored in an external cryogenic component in an open refrigeration loop
- F25J1/0223—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 the cold stored in an external cryogenic component in an open refrigeration loop in combination with the subsequent re-vaporisation of the originally liquefied gas at a second location to produce the external cryogenic component
-
- 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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/20—Processes or apparatus using other separation and/or other processing means using solidification of components
-
- 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
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/02—Multiple feed streams, e.g. originating from different sources
-
- 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
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/62—Liquefied natural gas [LNG]; Natural gas liquids [NGL]; Liquefied petroleum gas [LPG]
-
- 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
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/80—Carbon dioxide
-
- 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
- F25J2260/00—Coupling of processes or apparatus to other units; Integrated schemes
- F25J2260/80—Integration in an installation using carbon dioxide, e.g. for EOR, sequestration, refrigeration etc.
-
- 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
- F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J2290/62—Details of storing a fluid in a tank
Landscapes
- 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)
- Ocean & Marine Engineering (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、燃焼排ガス中の炭酸ガ
スを、液化天然ガス（以下、ＬＮＧと記す）の液化エネ
ルギー（冷熱）を利用してドライアイスとして分離・回
収し、そのドライアイスの冷熱を有効利用することによ
り天然ガスを液化する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention separates and recovers carbon dioxide gas in combustion exhaust gas as dry ice by utilizing the liquefaction energy (cold heat) of liquefied natural gas (hereinafter referred to as LNG). The present invention relates to a method for liquefying natural gas by effectively utilizing the cold heat of.
【０００２】[0002]
【従来の技術】近年、ＬＮＧを燃料とした発電所の建設
が推進されている。しかしながら、約−１６０℃の低温
のＬＮＧをガス燃料として使用する際に、大気あるいは
海水から必要な気化熱を得てＬＮＧを気化させる従来の
方法では、ＬＮＧの保有する冷熱が有効利用されずに放
出され、液化エネルギーの損失となっている。また、気
体の天然ガスを液化するためには圧縮装置による冷却方
式が採用されている。2. Description of the Related Art In recent years, construction of power plants using LNG as fuel has been promoted. However, when LNG at a low temperature of about −160 ° C. is used as a gas fuel, the conventional method of vaporizing LNG by obtaining the necessary heat of vaporization from the atmosphere or seawater does not effectively use the cold heat of LNG. It is released, resulting in a loss of liquefaction energy. In addition, a cooling system using a compression device is adopted to liquefy the natural gas as a gas.
【０００３】一方、最近大気中の炭酸ガス量が増加し、
温室効果と呼ばれている大気温度の上昇と炭酸ガス量と
の関係が問題視されており、この対策として、排ガス中
の炭酸ガスを濃縮し、ガス状、液状または固体状（ドラ
イアイス化）で分離・回収することが検討されている
が、現状ではほとんど処理されずに大気放出されてい
る。On the other hand, recently, the amount of carbon dioxide in the atmosphere has increased,
The relationship between the rise in atmospheric temperature and the amount of carbon dioxide, which is called the greenhouse effect, has been regarded as a problem. As a measure against this, carbon dioxide in exhaust gas is concentrated to form a gaseous, liquid or solid form (dry ice). Although it is considered to be separated and recovered in Japan, it is released into the atmosphere without being processed at present.
【０００４】[0004]
【発明が解決しようとする課題】前述した従来の方法に
ついては各々次のような問題点がある。The above-mentioned conventional methods have the following problems, respectively.
【０００５】１）一般に、天然ガスを液化する際に膨大
なエネルギーが必要であるが、消費地では、ＬＮＧの気
化熱は海水等と熱交換によって大気放出されている。1) Generally, a huge amount of energy is required when liquefying natural gas, but in the consuming area, the heat of vaporization of LNG is released to the atmosphere by heat exchange with seawater and the like.
【０００６】２）大気中へ放出された炭酸ガスの約半分
は海洋等に吸収され、残りは大気中に残存することや、
近年の燃焼排ガスの量の増加とあいまって、海洋等の吸
収では追いつかない状態にある。従って、大気中の炭酸
ガス量が増加し、近年、温室効果と呼ばれている大気温
度の上昇が問題視されることとなった。2) About half of the carbon dioxide gas released to the atmosphere is absorbed by the ocean and the rest remains in the atmosphere.
With the increase in the amount of combustion exhaust gas in recent years, it is in a state where it cannot catch up with the absorption of the ocean and the like. Therefore, the amount of carbon dioxide in the atmosphere has increased, and in recent years, an increase in atmospheric temperature called the greenhouse effect has become a problem.
【０００７】３）排ガス中の炭酸ガスを膜分離法によっ
てガス状で分離する方法もあるが、発電所などの大容量
のガス処理には設備のスケールアップ、コストなど問題
が大きい。3) There is also a method of separating carbon dioxide gas in exhaust gas into a gas state by a membrane separation method, but large-scale gas treatment at a power plant or the like has problems such as equipment scale-up and cost.
【０００８】このような状況の下で、本発明はＬＮＧが
もつ冷熱を有効に活用しこれらの問題を解決するＬＮＧ
冷熱の循環再利用方法を提供することを課題としてい
る。Under these circumstances, the present invention effectively utilizes the cold heat of LNG and solves these problems.
It is an object to provide a method for circulating and reusing cold heat.
【０００９】[0009]
【課題を解決するための手段】本発明は前記課題を解決
するため、ＬＮＧ冷熱を利用して燃焼排ガス中の炭酸ガ
スを固化（ドライアイス化）し、このドライアイスを天
然ガスの産地に運搬し、そのドライアイスの昇華熱によ
り天然ガスを液化することにより前記課題を解決する方
法を提案するものである。In order to solve the above-mentioned problems, the present invention uses LNG cold heat to solidify carbon dioxide gas in combustion exhaust gas (to form dry ice) and transport the dry ice to a natural gas producing area. However, the present invention proposes a method for solving the above problems by liquefying natural gas by the sublimation heat of the dry ice.
【００１０】[0010]
【作用】メタンガスが主成分の天然ガスは約−１６０℃
以下で液化する。一方、炭酸ガスは、大気圧下で−７
８．５℃で固化してドライアイスとなるが、排ガス中に
はＮ2 ，Ｏ2 ，Ｈ2 Ｏ，など炭酸ガス以外が含まれてい
るので炭酸ガスは約５％以下の低濃度で、−１３５℃以
下まで冷却しないと固化しない。ＬＮＧは−１５０〜−
１６０℃の低温状態にあり、これを気化する時に発生す
る潜熱を有効利用することにより、炭酸ガスを固化する
温度以下に冷却できる。[Function] Natural gas whose main component is methane gas is about -160 ° C.
It liquefies below. On the other hand, carbon dioxide is -7 at atmospheric pressure.
Although it solidifies at 8.5 ° C to become dry ice, the exhaust gas contains N 2 , O 2 , H 2 O, and the like other than carbon dioxide, so carbon dioxide has a low concentration of about 5% or less, It does not solidify unless cooled to below -135 ° C. LNG is -150-
It is in a low temperature state of 160 ° C., and by effectively utilizing the latent heat generated when vaporizing it, it is possible to cool the carbon dioxide gas to a temperature below its solidifying temperature.
【００１１】こうしてＬＮＧの冷熱を利用して得られた
ドライアイスはＬＮＧ生産地に運ばれ、その昇華時に発
生する冷熱で天然ガスを冷却してＬＮＧを得る。ドライ
アイスを昇華して発生した炭酸ガスは大気放出してもよ
いが、メタン合成装置に導いてメタンを合成し天然ガス
に混合するのが好ましい。The dry ice obtained by utilizing the cold heat of LNG is transported to the LNG production site, and natural gas is cooled by the cold heat generated during sublimation to obtain LNG. Carbon dioxide generated by sublimation of dry ice may be released to the atmosphere, but it is preferable to introduce it to a methane synthesizer to synthesize methane and mix it with natural gas.
【００１２】[0012]
【実施例】以下、本発明によるＬＮＧ冷熱の循環再利用
方法の実施の態様を添付図面を用いて具体的に説明す
る。ＬＮＧは、一般に約−１５０〜−１６５℃の低温で
発電所に輸送されてくる。従来は、このＬＮＧを海水で
常温付近まで昇温して燃料に使用していた。Embodiments of the method for circulating and reusing LNG cold heat according to the present invention will be specifically described below with reference to the accompanying drawings. LNG is generally shipped to power plants at low temperatures of about -150 to -165 ° C. Conventionally, this LNG has been heated to near room temperature with seawater and used as fuel.
【００１３】図１に本発明を適用したプロセスフローを
示す。天然ガスの産地では、液化装置１により天然ガス
を液化し、運搬船２により需要地に運搬される。需要地
では、熱媒体をライン３から気化装置５に供給し、液化
天然ガスを暖めて気化させ、冷熱を交換して低温となっ
た熱媒体をライン４から排出する。気化した天然ガス
は、ライン６を経て燃焼器７で燃料として使用される。FIG. 1 shows a process flow to which the present invention is applied. At the natural gas producing area, the liquefying device 1 liquefies the natural gas and the carrier ship 2 conveys the natural gas to the demand area. In the demand area, the heat medium is supplied to the vaporizer 5 from the line 3, the liquefied natural gas is warmed to be vaporized, and the heat medium having a low temperature by exchanging the cold heat is discharged from the line 4. The vaporized natural gas is used as fuel in the combustor 7 via the line 6.
【００１４】燃焼排ガスは、ライン８を経て炭酸ガス固
化装置９に導かれ、前記したように気化装置５でＬＮＧ
と熱交換して極低温となってライン４から導かれる冷媒
によって約−１３５〜−１４５℃で排ガス中の炭酸ガス
のみを効率的に固化し、排ガスから分離する。排ガス
は、ライン１０から排出される。炭酸ガス固化装置９で
炭酸ガスを冷却した後の冷媒はライン４を通して再び気
化装置５に導かれＬＮＧで極低温に冷却される。The combustion exhaust gas is guided to the carbon dioxide gas solidification device 9 through the line 8 and, as described above, LNG is generated in the vaporization device 5.
The carbon dioxide in the exhaust gas is efficiently solidified at about -135 to -145 ° C by the refrigerant introduced from the line 4 to become an extremely low temperature, and separated from the exhaust gas. The exhaust gas is discharged from the line 10. After the carbon dioxide gas is cooled by the carbon dioxide gas solidification device 9, the refrigerant is again guided to the vaporization device 5 through the line 4 and cooled to an extremely low temperature by LNG.
【００１５】低温のドライアイスは、運搬船１１で天然
ガスの産地に運搬され、ドライアイス昇華装置１２で昇
華され、得られた炭酸ガスはライン１３を経て、メタン
合成装置１４に導かれる。The low-temperature dry ice is transported to a natural gas producing area by a carrier 11, sublimated by a dry ice sublimation device 12, and the obtained carbon dioxide gas is led to a methane synthesis device 14 via a line 13.
【００１６】ドライアイスの昇華時に発生する冷熱は、
冷却用熱媒体によりライン１５を経て液化装置１に供給
され、天然ガスとの熱交換により温度が高くなった冷却
用媒体はライン１６からドライアイス昇華装置１２に循
環される。The cold heat generated during sublimation of dry ice is
The cooling medium, which is supplied to the liquefying device 1 via the line 15 by the cooling heat medium and has a high temperature due to heat exchange with the natural gas, is circulated from the line 16 to the dry ice sublimation device 12.
【００１７】ドライアイス昇華装置１２で発生した炭酸
ガスは、そのまま大気放出しても良いが、温室効果な
ど、地球環境への影響も考慮し、本実施例ではライン１
３を経てメタン合成装置１４に導かれ、ライン１７から
供給される水素と一緒にメタンに合成された後、ライン
１８を経て天然ガスに混合される。The carbon dioxide gas generated by the dry ice sublimation device 12 may be released into the atmosphere as it is, but in consideration of the effect on the global environment such as the greenhouse effect, the line 1 is used in this embodiment.
After being introduced into the methane synthesis unit 14 via 3 and synthesized into methane together with hydrogen supplied from the line 17, it is mixed with natural gas via the line 18.
【００１８】以上の実施例で説明したように、天然ガス
はメタンガスが主成分であり、約−１６０℃以下で液化
する。そこで、ＬＮＧが気化するときに発生する冷熱を
有効利用する。As explained in the above embodiments, natural gas is mainly composed of methane gas and liquefies at about -160 ° C or lower. Therefore, the cold heat generated when LNG vaporizes is effectively used.
【００１９】純炭酸ガスの場合には、−７８．５℃（大
気圧７６０mmHg) で固化してドライアイスとなる。しか
しながら、排ガス中にはＮ2 ，Ｏ2 ，Ｈ2 Ｏ，など炭酸
ガス以外が含まれているので炭酸ガスは約５％以下の低
濃度で、−１３５℃以下まで冷却しないと固化しない。In the case of pure carbon dioxide, it solidifies at −78.5 ° C. (atmospheric pressure 760 mmHg) to give dry ice. However, at low concentrations carbon dioxide of less than about 5% since the flue gas N 2, O 2, H 2 O, contains non-carbon dioxide, etc., is not solidified without cooling to -135 ° C. or less.
【００２０】ＬＮＧは−１５０〜−１６０℃の低温状態
にあり、これを気化する時に発生する潜熱を有効利用す
ることにより、炭酸ガスを固化または液化する温度以下
に冷却できる。ドライアイス製造方法の例としては、特
願平０２−１８８２９０号（特開平０４−０７７３０８
号）がある。LNG is in a low temperature state of -150 to -160 ° C., and by effectively utilizing the latent heat generated when vaporizing it, it can be cooled to a temperature below the temperature at which carbon dioxide is solidified or liquefied. As an example of a method for producing dry ice, Japanese Patent Application No. 02-188290 (Japanese Patent Application Laid-Open No. 04-077308) is available.
No.)
【００２１】一方、炭酸ガスを加圧すると−６０℃以上
でも液化する。例えば、圧力を４０kg/cm2にすると約−
５５〜１０℃の範囲で液体となる。しかしながら、加圧
には余分の電力が必要であり、加圧装置になると設備費
も上昇する。従って、炭酸ガスを液体で回収するより
も、本発明のように大気圧でＬＮＧの余剰冷熱を有効利
用してドライアイスとして回収する方が工業上有効であ
る。炭酸ガスは、水素と以下の触媒反応によりメタンに
なる。On the other hand, when carbon dioxide gas is pressurized, it liquefies even at -60 ° C or higher. For example, if the pressure is set to 40 kg / cm 2 , about −
It becomes liquid in the range of 55-10 ° C. However, pressurization requires extra power, and a pressurizing device also increases equipment costs. Therefore, it is industrially more effective to recover the carbon dioxide gas as dry ice by effectively utilizing the excess cold heat of LNG at atmospheric pressure, as in the present invention. Carbon dioxide becomes methane by the following catalytic reaction with hydrogen.
【００２２】ＣＯ2 ＋４Ｈ2 → ＣＨ4 ＋２Ｈ2 Ｏ 水素は、太陽熱利用水電解や石油のリフォーミング等で
発生する。一般に、天然ガスの産地は油田に近く、従っ
て、メタン合成に必要な水素の入手も容易である。CO 2 + 4H 2 → CH 4 + 2H 2 O Hydrogen is generated by water electrolysis utilizing solar heat or reforming of petroleum. In general, natural gas is produced near oil fields, and therefore the hydrogen required for methane synthesis is easily available.
【００２３】[0023]
【発明の効果】以上、説明したように本発明はＬＮＧの
冷熱を有効利用して、排ガス中の炭酸ガスをドライアイ
スとして固化・分離した後、ドライアイスの冷熱を天然
ガスの液化に循環使用することにより、地球環境を汚染
することなく、エネルギー循環を行うことができ、工業
上有益である。As described above, according to the present invention, the cold heat of LNG is effectively used to solidify and separate carbon dioxide gas in exhaust gas as dry ice, and then the cold heat of dry ice is circulated for liquefaction of natural gas. By doing so, energy circulation can be performed without polluting the global environment, which is industrially beneficial.
【図１】本発明の一実施例の系統図である。FIG. 1 is a system diagram of an embodiment of the present invention.
１ 液化装置 ２ 運搬船 ５ 気化装置 ７ 燃焼器 ９ 炭酸ガス固化装置 １１ 運搬船 １２ ドライアイス昇華装置 １４ メタン合成装置 1 Liquefaction device 2 Carrier ship 5 Vaporizer 7 Combustor 9 Carbon dioxide solidification device 11 Carrier ship 12 Dry ice sublimation device 14 Methane synthesizer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 竹内 善幸 広島市西区観音新町四丁目６番22号 三菱 重工業株式会社広島研究所内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshiyuki Takeuchi 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Mitsubishi Heavy Industries Ltd. Hiroshima Research Laboratory
Claims (1)
排ガス中の炭酸ガスをドライアイスとして分離・回収
し、このドライアイスを液化天然ガス生産地に運搬しそ
の昇華により発生する冷熱で天然ガスを冷却して液化天
然ガスとすることを特徴とする天然ガス液化エネルギー
の再循環利用方法。1. The natural gas liquefaction energy is used to separate and collect carbon dioxide gas in combustion exhaust gas as dry ice, and the dry ice is transported to a liquefied natural gas production site to generate natural gas by cold heat generated by sublimation thereof. A method for recycling and reusing natural gas liquefied energy, characterized by cooling to liquefied natural gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7075628A JPH08269469A (en) | 1995-03-31 | 1995-03-31 | Recycle of natural gas liquefaction energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7075628A JPH08269469A (en) | 1995-03-31 | 1995-03-31 | Recycle of natural gas liquefaction energy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08269469A true JPH08269469A (en) | 1996-10-15 |
Family
ID=13581703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7075628A Pending JPH08269469A (en) | 1995-03-31 | 1995-03-31 | Recycle of natural gas liquefaction energy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08269469A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005330170A (en) * | 2004-05-21 | 2005-12-02 | Toshiba Corp | Hydrogen production system and hydrogen production method |
| WO2008139536A1 (en) * | 2007-04-27 | 2008-11-20 | Hitachi, Ltd. | Natural gas liquefaction plant and method of operating the same |
| JP2018514713A (en) * | 2015-04-08 | 2018-06-07 | クライオ ピュール | How to recover energy from dry ice at pressures below atmospheric pressure |
| JP2018165322A (en) * | 2017-03-28 | 2018-10-25 | 東京瓦斯株式会社 | Transportation method and transportation system |
| CN109424341A (en) * | 2017-09-05 | 2019-03-05 | 斗山重工业建设有限公司 | Use the system of the carbon dioxide in the exhaust gas by the cold and hot collection of liquefied natural gas |
-
1995
- 1995-03-31 JP JP7075628A patent/JPH08269469A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005330170A (en) * | 2004-05-21 | 2005-12-02 | Toshiba Corp | Hydrogen production system and hydrogen production method |
| WO2008139536A1 (en) * | 2007-04-27 | 2008-11-20 | Hitachi, Ltd. | Natural gas liquefaction plant and method of operating the same |
| JP4879321B2 (en) * | 2007-04-27 | 2012-02-22 | 株式会社日立製作所 | Natural gas liquefaction plant and operation method thereof |
| JP2018514713A (en) * | 2015-04-08 | 2018-06-07 | クライオ ピュール | How to recover energy from dry ice at pressures below atmospheric pressure |
| JP2018165322A (en) * | 2017-03-28 | 2018-10-25 | 東京瓦斯株式会社 | Transportation method and transportation system |
| CN109424341A (en) * | 2017-09-05 | 2019-03-05 | 斗山重工业建设有限公司 | Use the system of the carbon dioxide in the exhaust gas by the cold and hot collection of liquefied natural gas |
| US11137203B2 (en) | 2017-09-05 | 2021-10-05 | Doosan Heavy Industries & Construction Co., Ltd. | System for utilizing carbon dioxide of flue gas captured by cold heat of liquefied natural gas |
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