CN103291253A - Seabed natural gas hydrate collecting method and system - Google Patents
Seabed natural gas hydrate collecting method and system Download PDFInfo
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- CN103291253A CN103291253A CN2013102836899A CN201310283689A CN103291253A CN 103291253 A CN103291253 A CN 103291253A CN 2013102836899 A CN2013102836899 A CN 2013102836899A CN 201310283689 A CN201310283689 A CN 201310283689A CN 103291253 A CN103291253 A CN 103291253A
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Abstract
The invention provides a seabed natural gas hydrate collecting method and system. An inverted funnel-shaped natural gas collector is released into the water from a maritime natural gas collecting ship, namely the natural gas collector is buckled on a natural gas hydrate accumulation horizon on a seabed, and a hot water injecting pipe is arranged at the bottom of the inside of the collector. High-temperature seawater or water steam is constantly injected into the bottom of the collector to heat and decompose natural gas hydrate, decomposed natural gas is delivered to the natural gas collecting ship through a collecting pipeline at the top end of the inside of the collector and is manufactured to be liquefied natural gas (LNG), compressed natural gas (CNG) or the natural gas hydrate through cooling and compression to be stored, a part of natural gas is used for heating the seawater, the natural gas collecting ship drags the submarine natural gas collector to slowly move, and continuous and large-scale production can be achieved in the whole collecting process. The seabed natural gas hydrate collecting method and system has the advantages that decomposition of the natural gas hydrate stops only by stopping high-temperature seawater injection, heat preservation measures are adopted for the pipeline and a container, and emissions only contain carbon dioxide.
Description
Technical field
The present invention relates to a kind of collection way and system of sea bed gas hydrates, especially a kind of cost simple in structure, reliable is low, energy-conserving and environment-protective, safety controlled non-pollutant discharge marine oil and gas resource acquisition way and system, technical field belongs to marine oil and gas resource exploitation field.
Background technology
The sea bed gas hydrates are crystalline solid that natural gas forms with water molecules under the cryogenic high pressure environment, the main gas componant that the back generation is decomposed in the heating decompression is the very high natural gas of purity (methane), methane molecule has only a carbon atom, the carbon dioxide of burning back discharging is few, and not having sulfide to produce, is a kind of desirable clean energy resource.Big some certain depth of midocean high latitude under water above the sea bed in 300～500 meters marine sites owing to belong to the cryogenic high pressure environment, depositing a large amount of highly stable gas hydrates, just combustible ices throughout the year.At present, also there are not a kind of technology and way of this sea bed gas hydrates of collection of maturation formally to put into commercial operation in the world, reason is all more complicated of existing collection way, the cost height, and lack controllability and operability, and cause the leakage of natural gas easily, cause the greenhouse effect of environment pollution and atmosphere, all prior aries also are in test room's exploratory stage, can't drop into commercial operation.
Summary of the invention
The present invention is in order to remedy the deficiencies in the prior art, provide a kind of simple in structure, reliable, cost is low, collection way and the system of the sea bed gas hydrates of energy-conserving and environment-protective, the controlled non-pollutant discharge of safety
The present invention is achieved by the following technical solutions: discharge one by marine natural gas collecting ship and fall the funnel shaped natural gas gatherer that is formed by the braiding of high duty metal silk to water-bed; just gatherer is buckled in the gas hydrates accumulation horizon above the sea bed; a hot water flow in pipes is arranged at the bottom of gatherer inside; constantly inject high temperature seawater or steam to the gatherer bottom; heating is also decomposed gas hydrates; natural gas after the decomposition constantly is transported on the natural gas collecting ship by the collection conduit of gatherer inner tip; make liquefied natural gas LNG or make gas hydrates again through supercooling; also can be compressed into compressed natural gas CNG stores; the part of collected natural gas is used for heating the seawater that injects in the gatherer; it is slowly mobile that the natural gas collecting ship drags water-bed natural gas gatherer, the large-scale production continuously of whole collection process.
The invention has the beneficial effects as follows: 1, because the present invention is by inject hot sea water gas in gatherer, make the gas hydrates decomposes finish that gas collects, as long as in the process of collecting, stop to inject high temperature seawater gas, gas hydrates will stop its decomposable process at short notice, can not cause the leakage of natural gas.2, collected part natural gas adds hot sea water after the combustion heating furnace internal combustion, a heat part of injecting the high temperature seawater of sea bed is absorbed by gas hydrates, and heat exchange adds hot sea water again and obtains recycling through heat exchanger after above remainder rises to.The high-temp waste gas that produces behind the combustion of natural gas is discharged in the atmosphere through behind the water tank again, and the moisture in the waste gas and heat are absorbed again and utilize, and the most pipelines of whole system and container tank adopt the insulation measure, almost do not have the waste of heat energy.3, this system adopts diesel-electric set electric supply, and cost is low, and is reliable, easy to maintenance.4, the gas hydrates above the sea bed are just collected by this system, can not cause sea bed to cave in.5, collected natural gas is not dispersed in the atmosphere, reaches the collection rate maximization through recycled for multiple times.6, the most of carbon dioxide in the waste gas of this system's burning generation is sneaked in the interior seawater of water tank, becomes carbonic acid and re-injects sea bed.Emission has only amounts of carbon dioxide.Be reused non-pollutant discharge below the whole backfill sea beds of other discarded objects.
(1) description of drawings
Accompanying drawing 1 is collected the schematic diagram of way and system for sea bed gas hydrates of the present invention;
Accompanying drawing 2 is collected the rough schematic view of way and system for sea bed gas hydrates of the present invention;
Wherein: 1 hot water (gas) input channel, 2 booster water pumps, 3 combustion heating furnaces, 4 booster fans, 5 water tanks, 6 diesel generating sets, 7 nitrogen compression refigerating machines, 8 holding vessels, 9 gases compression eliminator, 10 heat exchangers, 11 natural gas collecting ships, 12 natural gas output channels, 13 supply-water pumps, 14 control centres, 15 gatherers, 16 hawsers.
(2) specific embodiment
Collect a kind of specific embodiment of way and system as shown in Figure 1, 2 for sea bed gas hydrates of the present invention.Comprise: hot water (gas) input channel (1), booster water pump (2), combustion heating furnace (3), booster fan (4), water tank (5), diesel generating set (6), nitrogen compression refigerating machine (7), holding vessel (8), gas compression eliminator (9), heat exchanger (10), natural gas collecting ship (11), natural gas output channel (12), supply-water pump (13), control centre (14), gatherer (15) and hawser (16).
Discharge one by marine natural gas collecting ship and fall funnel shaped natural gas gatherer (15) to water-bed, just the natural gas gatherer is buckled in gas hydrates accumulation horizon above the sea bed above, a hot water flow in pipes (1) is arranged at the bottom of natural gas gatherer inside, constantly inject high temperature seawater or steam to the gatherer bottom, heating is also decomposed gas hydrates, natural gas after the decomposition constantly is transported on the natural gas collecting ship (11) by the collection conduit (12) of natural gas gatherer inner tip, enters heat exchanger (10) and cools off; The isolated condensed water in natural gas via heat exchanger (10) cooling back flows in the water tank (5).
Natural gas via heat exchanger (10) cooling, after compressing through gas compression eliminator (9) again and isolating wherein moisture, distribute through the flow-control distributing valve, liquefy natural gas LNG after most of natural gas is cooled to-162 ℃ through nitrogen pressure contracting refrigeration machine (7), perhaps become gas hydrates again, also can be compressed into compressed natural gas CNG and be transported to wait transhipment in the holding vessel (8).Fraction is transported to combustion heating furnace (3) internal combustion and adds hot sea water.
Combustion heating furnace (3) burning that can act as a fuel with ready-made natural gas at first adds hot sea water.The high-temp waste gas that produces behind the interior combustion of natural gas of combustion heating furnace (3) (main component is carbon dioxide, a small amount of sulfide and steam) through booster fan (4) supercharging, enters in the water tank (5), and the heat in the waste gas adds hot sea water again; Steam liquefy water in the waste gas, sulfide also dissolves in water; Most of carbon dioxide in the waste gas becomes carbonic acid and is mixed in jar interior seawater, re-injects sea bed.Emission has only amounts of carbon dioxide.
The operation of this system particularly flow of each pipeline is carried out integral body control by control centre (14).
Seawater in the water tank (5) is mainly drawn from surface seawater by supply-water pump (13), provides after heat exchanger (10) heating.
Hot water (gas) input channel (1) is to import hot water or hot steam according to what and the decision of seawater backfill needs of sea bed gas output.
Along with the continuous injection of hot water (gas), the gas hydrates below the gatherer can constantly decompose, and collecting ship gatherer is in tow successively collected whole ore bed.
In order to reduce thermal loss, the nearly all transfer pipeline of this system and container tank outside all will be incubated heat insulation processing.
The simplification drive manner of this system is, heated hot water gas injects sea bed continuously through superheated water (gas) input channel (1), and gaseous natural gas is produced from output pipe (12) continuously.
Claims (10)
1. collection way and the system of sea bed gas hydrates, comprise: hot water (gas) input channel (1), booster water pump (2), combustion heating furnace (3), booster fan (4), water tank (5), diesel generating set (6), nitrogen compression refigerating machine (7), holding vessel (8), gas compression eliminator (9), heat exchanger (10), natural gas collecting ship (11), natural gas output channel (12), supply-water pump (13) and control centre (14), gatherer (15), hawser (16); It is characterized in that nearly all conveyance conduit and container tank outside all will be incubated heat insulation processing in order to prevent thermal loss.
2. collection way and the system of sea bed gas hydrates according to claim 1 is characterized in that: discharge one by marine natural gas collecting ship (11) and fall funnel shaped natural gas gatherer (15) to water-bed, just the natural gas gatherer is buckled in gas hydrates accumulation horizon above the sea bed above, a hot water flow in pipes (1) is arranged at the bottom of natural gas gatherer inside, constantly inject high temperature seawater or steam to the gatherer bottom, heating is also decomposed gas hydrates, natural gas after the decomposition constantly is transported on the natural gas collecting ship (11) by the collection conduit (12) of natural gas gatherer inner tip, enters heat exchanger (10) and cools off.
3. collection way and the system of sea bed gas hydrates according to claim 1 is characterized in that: the part natural gas that this system produces heats to seawater as the fuel of combustion heating furnace (3); Water in the water tank (5) is delivered into heating in the combustion heating furnace (3) through booster water pump (2), constantly injects sea bed by hot water (gas) input channel (1) then.
4. collection way and the system of sea bed gas hydrates according to claim 1 is characterized in that: the waste gas that combustion heating furnace (3) produces is input in the water tank (5) after by booster fan (4) supercharging, its waste heat and moisture and sulfur-bearing refuse are absorbed by water, most of carbon dioxide in the waste gas becomes carbonic acid and is mixed in jar interior seawater, and being back to sea bed again, emission has only amounts of carbon dioxide.
5. collection way and the system of sea bed gas hydrates according to claim 1 is characterized in that: the final products of this system stores jar (8) lining are gas hydrates or liquid natural gas LNG or compressed natural gas CNG; Be LNG or CNG as fruit product, product enters holding vessel (8) will isolate moisture through gas compression eliminator (9) before, cools through nitrogen compression refigerating machine (7) again.
6. collection way and the system of sea bed gas hydrates according to claim 1 is characterized in that: in this system the gas hydrates of sea bed be in the mode of natural gas and the blowing of steam mist through natural gas output channel (12) ejection, rise on the natural gas collecting ship (11).
7. collection way and the system of sea bed gas hydrates according to claim 1 is characterized in that: seawater enters water tank (5) before through supply-water pump (13), to pass through heat exchanger (10) and carry out the exchange heat intensification, give the natural gas cooling that has just come up from natural gas output channel (12) simultaneously.
8. collection way and the system of sea bed gas hydrates according to claim 1 is characterized in that: the overall operation of this system is controlled by control centre (14), and this system uses diesel generating set (6) power supply.
9. collection way and the system of sea bed gas hydrates according to claim 1 is characterized in that: gatherer (15) is formed by the braiding of high duty metal silk, soft metal bracelet is equipped with on the base, and gatherer (15) is to be dragged by the high strength hawser (16) of fastening on natural gas collecting ship (11).
10. collection way and the system of sea bed gas hydrates according to claim 1 is characterized in that: do not need from the fuel of land transport to the seawater heating.
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| CN201310283689.9A CN103291253B (en) | 2013-07-06 | 2013-07-06 | The collecting device of sea bed gas hydrates |
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| CN201310283689.9A CN103291253B (en) | 2013-07-06 | 2013-07-06 | The collecting device of sea bed gas hydrates |
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| CN103291253B CN103291253B (en) | 2016-08-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106703780A (en) * | 2017-01-05 | 2017-05-24 | 大连理工大学 | Slant well marine gas hydrate extracting method |
| CN113445966A (en) * | 2021-08-02 | 2021-09-28 | 西南石油大学 | Ocean natural gas hydrate exploitation analogue means |
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| CN1690360A (en) * | 2004-04-21 | 2005-11-02 | 中国科学院过程工程研究所 | Method and system for exploiting seabed natural gas hydrates |
| CN101016841A (en) * | 2007-02-13 | 2007-08-15 | 中国科学院广州能源研究所 | Method for exploiting natural gas hydrates and device thereof |
| CN102140907A (en) * | 2011-01-14 | 2011-08-03 | 何相龙 | Method for collecting methane from combustible ice |
| CN201953359U (en) * | 2011-02-23 | 2011-08-31 | 中国地质科学院勘探技术研究所 | Automatic exploitation system of natural gas hydrate |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2003021079A1 (en) * | 2001-08-28 | 2003-03-13 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method and device for the extraction and transport of gas hydrates and gases from gas hydrates |
| CN1690360A (en) * | 2004-04-21 | 2005-11-02 | 中国科学院过程工程研究所 | Method and system for exploiting seabed natural gas hydrates |
| CN101016841A (en) * | 2007-02-13 | 2007-08-15 | 中国科学院广州能源研究所 | Method for exploiting natural gas hydrates and device thereof |
| CN102140907A (en) * | 2011-01-14 | 2011-08-03 | 何相龙 | Method for collecting methane from combustible ice |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106703780A (en) * | 2017-01-05 | 2017-05-24 | 大连理工大学 | Slant well marine gas hydrate extracting method |
| CN106703780B (en) * | 2017-01-05 | 2019-04-16 | 大连理工大学 | A kind of slant well exploiting ocean natural gas hydrates method |
| CN113445966A (en) * | 2021-08-02 | 2021-09-28 | 西南石油大学 | Ocean natural gas hydrate exploitation analogue means |
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| CN103291253B (en) | 2016-08-17 |
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| CB03 | Change of inventor or designer information |
Inventor after: Li Xianming Inventor after: Liu Xiaopeng Inventor after: Li Leshui Inventor after: Li Yonghong Inventor before: Li Xianming Inventor before: Li Leshui Inventor before: Li Yonghong |
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Effective date of registration: 20160711 Address after: 315000 Zhejiang Province, Ningbo City Jiangdong District Jiangnan Road No. 599 Applicant after: NINGBO CHENGDA MACHINERY Research Institute Address before: 250100 No. 18 Huaxin Road, Lixia District, Shandong, Ji'nan Applicant before: Li Xianming |
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Effective date of registration: 20230719 Address after: 255000 No. 108, Wanjie Road, high tech Zone, Zibo City, Shandong Province Patentee after: ZIBO HIGH-TECH ZONE CHENGDA MACHINERY DESIGN INSTITUTE Address before: 315000 No. 599 Jiangnan Road, Jiangdong District, Ningbo City, Zhejiang Province Patentee before: NINGBO CHENGDA MACHINERY Research Institute |