CN111577213B - System and method for solid-state storage and transportation of gas produced by ocean combustible ice - Google Patents
System and method for solid-state storage and transportation of gas produced by ocean combustible ice Download PDFInfo
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- 238000003860 storage Methods 0.000 title claims abstract description 157
- 238000000034 method Methods 0.000 title claims abstract description 62
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 268
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 157
- 238000004519 manufacturing process Methods 0.000 claims abstract description 117
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 55
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 54
- 230000008569 process Effects 0.000 claims abstract description 45
- 239000007787 solid Substances 0.000 claims abstract description 36
- 238000000465 moulding Methods 0.000 claims abstract description 22
- 238000004880 explosion Methods 0.000 claims abstract description 18
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000007906 compression Methods 0.000 claims abstract description 13
- 230000002194 synthesizing effect Effects 0.000 claims description 39
- 238000005507 spraying Methods 0.000 claims description 37
- 239000002002 slurry Substances 0.000 claims description 35
- 238000003756 stirring Methods 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 19
- 238000005065 mining Methods 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 10
- 238000012546 transfer Methods 0.000 claims description 10
- 239000012528 membrane Substances 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 9
- 238000005057 refrigeration Methods 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 claims description 4
- 239000000872 buffer Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims 2
- 239000007789 gas Substances 0.000 abstract description 126
- 239000003949 liquefied natural gas Substances 0.000 abstract description 11
- 238000007711 solidification Methods 0.000 abstract description 3
- 230000008023 solidification Effects 0.000 abstract description 3
- 238000000354 decomposition reaction Methods 0.000 description 6
- 238000011065 in-situ storage Methods 0.000 description 5
- 230000003446 memory effect Effects 0.000 description 5
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- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
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- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L7/00—Fuels produced by solidifying fluid fuels
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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Abstract
The invention provides a solid-state storage and transportation system for gas produced by exploiting ocean combustible ice, which is characterized in that production water and methane gas obtained by exploiting the combustible ice are conveyed to a combustible ice synthesis pretreatment system through an exploiting platform; pretreating production water and methane gas by a combustible ice synthesis pretreatment system, and conveying the pretreated production water and methane gas to a methane gas solidification device; the methane gas solid stating device is used for synthesis, compression solid stating and molding treatment of combustible ice, and conveying the treated combustible ice to a combustible ice storage device for storage and transportation. The invention also provides a method for storing and transporting the gas produced by the marine combustible ice in a solid state mode, which synthesizes, cools, decompresses and compresses the combustible ice through the methane gas solid state device, realizes the long-distance transportation of the combustible ice in a lower pressure environment, effectively avoids the high cost of the ultralow temperature transportation of the liquefied natural gas, and reduces the explosion risk in the transportation process of the liquefied natural gas.
Description
Technical Field
The invention relates to the technical field of utilization, storage and transportation of ocean combustible ice resource development, in particular to a system and a method for solid-state storage and transportation of gas produced by ocean combustible ice.
Background
Combustible ice, also called natural gas hydrate, is a crystalline cage-type compound formed by gas molecules (mainly methane molecules in the nature) and water molecules under high-pressure and low-temperature environmental conditions, and is known as a substitute energy with the most abundant potential in the 21 st century due to the advantages of wide distribution, large reserve, high energy density, cleanness and no pollution after combustion and the like.
Although the continuous preparation device and the preparation method of the blocky combustible ice in the patent application (with the publication number of 108192684A) disclose a preparation method of the blocky combustible ice, in the practical application process, the exploitation of the marine combustible ice is far away from the continent, and the transportation of methane gas of the exploited product to a continent terminal user is an important link for determining the industrial utilization of the combustible ice safely and economically. The conventional pipeline natural gas transportation mode has the defects of high pipeline laying cost, high risk, easy corrosion of pipelines in the marine environment and the like in the ocean environment for a long distance. At present, natural gas is stored and transported in an ocean environment mainly by using a liquefied natural gas technology, and the natural gas is liquefied and transported after the natural gas is subjected to three-step impurity removal on an exploitation platform. The liquefied natural gas needs to be treated at the temperature of minus 162 ℃, in the transportation process, the storage container is always kept in a high-pressure and low-temperature environment, the requirements on transportation personnel and related operating personnel are high, the liquefaction and purification process is relatively complex, and explosion is easy to occur.
Disclosure of Invention
The invention provides a solid-state storage and transportation system and method for gas produced by ocean combustible ice, aiming at overcoming the technical defects that the existing mode of carrying out ocean environment natural gas storage and transportation by liquefied natural gas has high requirements on transportation personnel and related operators, the liquefaction and purification processes are relatively complex, and explosion is easy to occur.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a solid-state storage and transportation system for gas exploitation of ocean combustible ice comprises an exploitation platform, a combustible ice synthesis pretreatment system, a methane gas solid-state device, a combustible ice storage device and a pipeline system; wherein:
the production platform is used for separating the combustible ice into production water and methane gas, and the production water and the methane gas are conveyed into the combustible ice synthesis pretreatment system through the pipeline system;
the combustible ice synthesis pretreatment system pretreats production water and methane gas and conveys the production water and the methane gas to the methane gas solidification device through the pipeline system;
the methane gas solid stating device is used for synthesizing combustible ice, compressing solid stating and modeling, and conveying the processed combustible ice to the combustible ice storage device for storage and transportation.
Compared with the existing combustible ice storage and transportation, the combustible ice is synthesized by using the methane gas and the pure water, the combustible ice is synthesized by using the produced water obtained after the combustible ice is mined and the methane gas obtained after the combustible ice is mined in the ocean in-situ environment, the characteristic of memory effect when the produced water obtained after the combustible ice is mined is used for reforming the combustible ice, the produced water obtained after the combustible ice is mined is subjected to in-situ treatment, and the high-cost effect caused by the fact that the produced water is pulled back to the continental environment for treatment is avoided. And the industrial ecological storage and transportation of the gas produced by the combustible ice can be realized.
The combustible ice synthesis pretreatment system comprises a production water storage device, a production water treatment device and a methane gas storage device; wherein:
the production water storage device is used for receiving and storing the production water from the mining platform through the pipeline system, the production water storage device is communicated with the production water treatment device through the pipeline system, and a control valve is arranged on the pipeline system;
the production water treatment device is used for carrying out multi-stage filtration separation and membrane permeation treatment on the stored production water and connecting the treated production water into the methane gas solidification device;
the methane gas storage device is used for receiving and storing methane gas from the mining platform through the pipeline system, and an output port of the methane gas storage device is connected with the methane gas solid-stating device.
In the scheme, the production water storage device plays a role in storing production water on one hand, and takes out silt in the production water through standing storage on the other hand, and a mud discharging original piece is designed at the lower part of the production water storage device; meanwhile, in order to ensure the memory effect of the production water as much as possible in the storage process, the production water cannot be heated too high, and the outer wall of the production water storage device is wrapped with an insulating layer and a water bath refrigeration jacket so as to ensure that the temperature of the production water is not higher than 25 ℃ in the whole storage process; the production water treatment device mainly carries out multi-stage separation and membrane permeation on production water produced by exploiting combustible ice through a water treatment process, and removes silt and other impurities carried in the exploiting process so as to ensure that the quality of the treated production water can meet the requirement of forming the combustible ice. The methane gas storage device mainly comprises a large gas storage tank and a pipeline system, and the purpose of storing and buffering methane gas mined from combustible ice is achieved.
In the scheme, the system not only utilizes the memory characteristic of the production water to synthesize the combustible ice, but also can carry out in-situ treatment and utilization on the production water, thereby avoiding the increase of the cost of transporting the production water back to land for treatment.
The methane gas solid-stating device comprises a device for quickly synthesizing combustible ice and a device for compressing and molding the combustible ice; wherein:
the device for rapidly synthesizing the combustible ice comprises a cavity and a control circuit, wherein a spraying original piece is arranged at the top of the inner wall of the cavity, a micro-bubble fluid processing original piece is arranged at the bottom of the inner wall, and an accelerator spraying original piece and a stirring original piece are arranged in the middle of the inner wall; the outer wall of the cavity is covered with an annular wall cooling and explosion cooling system;
the spraying element, the microbubble fluid treatment element, the accelerator spraying element, the stirring element and the annular wall cooling and explosion system are all electrically connected with the control circuit and are controlled by the control circuit;
the device for rapidly synthesizing the combustible ice is connected with the combustible ice compression and molding device through the pipeline system;
the combustible ice compression and molding device is used for filtering the combustible ice slurry synthesized in the rapid combustible ice synthesis device, forming high-density blocky or spherical combustible ice as required, and transmitting the blocky or spherical combustible ice to the combustible ice storage device through the pipeline system.
In the above-mentioned scheme, synthesize combustible ice device fast mainly including can carry out the production water after the processing of pouring into multi-direction even spraying original paper, will carry out microbubble fluid processing original paper via the methane gas that methane gas storage device pours into, pour into and spray the promoter injection original paper that combustible ice formed, built-in stirring original paper and the outer surrounding wall cooling blast system that strengthens the mass transfer.
In the above-mentioned scheme, the production water evenly sprays the entering through the top of rapid synthesis combustible ice device, simultaneously, introduce methane gas by methane gas storage device by rapid synthesis combustible ice device bottom, methane gas separates through the microbubble fluid treatment original paper of rapid synthesis combustible ice device bottom, then with the production water intensive mixing that the top sprayed, and spray the promoter of a certain amount formation combustible ice through the wall, after pressure in the combustible ice synthesizer increases to set pressure scope (12-20MPa), reduce the original paper in the device to 4 ℃, then start the stirring, strengthen mass transfer rate, carry out combustible ice's synthesis. The stirring mode may adopt a continuous stirring mode or a sequencing batch stirring mode.
In the scheme, after a large amount of combustible ice slurry is synthesized, the combustible ice slurry is introduced into a combustible ice compression and molding device from a device for quickly synthesizing combustible ice, the temperature in the device is reduced to be in the range of-15 to-10 ℃, then the pressure in the device is reduced to be in the range of 0.15 to 2MPa, the combustible ice slurry is filtered out of redundant moisture in the device, and then the filtered combustible ice slurry is compressed into a solid spherical or blocky high-quality combustible ice finished product according to the requirement.
The combustible ice storage device is a storage tank consisting of a plurality of pressure-resistant tanks; the top of the storage tank is provided with a pressure gauge and a built-in temperature sensor; the device is used for monitoring the temperature and the pressure of the pressure-resistant tank in real time.
The top of the pressure-resistant tank is provided with a guide pipe, and the guide pipe is finally synthesized into a pipeline to be connected with the pressure-resistant tank which is not filled with combustible ice.
In the scheme, after solid high-quality combustible ice is synthesized, the solid high-quality combustible ice is filled into the combustible ice storage device, a small part of gas space is reserved at the top of each combustible ice storage tank, and each combustible ice storage tank is connected with an empty tank which is the same as the combustible ice storage tank through the drainage guide pipe. The empty tank is used for collecting methane gas released by decomposition of combustible ice caused by carelessness in the storage and transportation process. In the whole transportation process, the temperature and pressure value change of the combustible ice storage tank is monitored and paid attention to in real time, and a certain amount of combustible ice stabilizer is sprayed in the combustible ice storage tank.
In the scheme, the combustible ice is quickly synthesized by the methods of pressurizing, cooling, spraying the accelerator, enhancing the mass transfer rate and the like in the device for quickly synthesizing the combustible ice, and then the slurry of the combustible ice is cooled, decompressed and compressed for forming, so that the combustible ice can be transported in a long distance under a lower pressure environment, the high cost of ultralow-temperature (lower than-20 ℃) transportation is effectively avoided compared with liquefied natural gas transportation, and the explosion risk in the transportation process of the liquefied natural gas is reduced.
In the scheme, the invention provides that a certain amount of combustible ice stabilizer is sprayed in the combustible ice storage tank, so that the stability of solid combustible ice can be effectively enhanced, and the combustible ice is prevented from being decomposed due to disturbance of an external environment in the transportation process. The invention also provides a method for collecting methane gas which is released by careless decomposition in the storage and transportation process by connecting an empty gas storage tank with a combustible ice storage tank, which not only avoids the safety risk caused by gas release pressurization, but also collects the gas to be used at a terminal, can avoid the severe environment in the whole storage and transportation process, and realizes ecological storage and transportation.
A method for solid-state storage and transportation of gas produced by ocean combustible ice comprises the following steps:
s1: respectively connecting the produced water and methane gas separated from the mining platform into a combustible ice synthesis pretreatment system through a pipeline system;
s2: the combustible ice synthesis pretreatment system pretreats the produced water and the methane gas and then stores the pretreated produced water and the methane gas, and the produced water and the methane gas are connected into the methane gas solidifying device through a pipeline system;
s3: the methane gas solid-stating device fully mixes the input methane gas with the production water, and sprays a certain amount of accelerant for forming combustible ice through the wall surface; when the pressure in the methane gas solid-stating device is increased to a set pressure range (12-20MPa) which is easy for combustible ice synthesis, then reducing the temperature in the device to 4 ℃, stirring and synthesizing the combustible ice;
s4: after a large amount of combustible ice slurry is synthesized, the temperature of a methane gas solid-stating device is reduced to-15 to-10 ℃, then the pressure in the device is reduced to ensure that the pressure range is 0.15 to 2MPa, the combustible ice is ensured to be stable and not to be decomposed, and then the combustible ice slurry is condensed into a solid spherical or blocky combustible ice finished product as required;
s5: and after the solid combustible ice finished product is synthesized, the solid combustible ice is put into a combustible ice storage device, and the temperature and the pressure in the device are monitored in real time, so that the environment guarantee is provided for subsequent transportation.
In step S2, the combustible ice synthesis pretreatment system stores and stands the production water by the production water storage device, and the temperature of the production water storage device is controlled to be below 25 ℃ by the insulating layer and the water bath refrigeration jacket which are arranged on the outer wall of the production water storage device; then, the production water is subjected to multistage filtration separation and membrane permeation by a production water treatment device by using a water treatment process to obtain the production water with the water quality meeting the requirement of the combustible ice;
the combustible ice synthesis pretreatment system buffers and stores methane gas obtained from an exploitation platform through a methane gas storage device.
In the above-mentioned scheme, the first step of the method,
in step S3, the methane gas solid-stating device includes a device for rapidly synthesizing combustible ice and a device for compressing and molding combustible ice; wherein:
the device for rapidly synthesizing the combustible ice comprises a cavity and a control circuit, wherein a spraying original piece is arranged at the top of the inner wall of the cavity, a micro-bubble fluid processing original piece is arranged at the bottom of the inner wall, and an accelerator spraying original piece and a stirring original piece are arranged in the middle of the inner wall; the outer wall of the cavity is covered with an annular wall cooling and explosion cooling system;
the spraying element, the microbubble fluid treatment element, the accelerator spraying element, the stirring element and the annular wall cooling and explosion system are all electrically connected with the control circuit and are controlled by the control circuit;
the production water is uniformly sprayed into the rapid combustible ice synthesis device through a spraying original piece at the top of the rapid combustible ice synthesis device, meanwhile, methane gas is introduced into a methane gas storage device from the lower part of the rapid combustible ice synthesis device, and is fully mixed with the production water sprayed at the top after being separated by a microbubble fluid treatment original piece at the bottom of the rapid combustible ice synthesis device, and a certain amount of accelerant for forming combustible ice is sprayed through an accelerant spraying original piece; when the pressure in the device for quickly synthesizing combustible ice is increased to the pressure condition (12-20MPa) which is easy for combustible ice to quickly form, the temperature in the device is reduced to 4 ℃, then the stirring element is started, the mass transfer rate is enhanced, and the combustible ice is synthesized;
in step S4, after a large amount of combustible ice slurry is synthesized, the combustible ice slurry is introduced into a combustible ice compression and molding device, the temperature and pressure conditions are changed to satisfy the stable existence of combustible ice, the temperature of the combustible ice compression and molding device is reduced to-15 to-10 ℃, the pressure in the device is reduced to maintain the pressure at 0.15 to 2MPa, excess moisture in the combustible ice slurry is filtered, and the filtered combustible ice slurry is compressed into a spherical or blocky combustible ice product in a solid state as required.
In step S5, after the solid combustible ice is synthesized, the solid combustible ice is loaded into a combustible ice storage device, where the combustible ice storage device is a storage tank composed of a plurality of pressure-resistant tanks; reserving a small part of gas space at the top of each pressure-resistant tank, and connecting each storage tank with a pressure-resistant tank which is not filled with combustible ice through a guide pipe to prevent methane gas from leaking;
in the transportation process, the temperature and the pressure in the device are monitored in real time, and environmental guarantee is provided for subsequent transportation.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a system and a method for solid-state storage and transportation of gas produced by ocean combustible ice, which are used for quickly synthesizing the combustible ice by utilizing the memory characteristic of produced water, and meanwhile, synthesizing, cooling, decompressing and compressing the combustible ice by a methane gas solid-state device, thereby realizing long-distance transportation of the combustible ice in a lower pressure environment, effectively avoiding high cost of ultra-low temperature transportation, and reducing explosion risk in the transportation process of liquefied natural gas.
Drawings
FIG. 1 is a schematic structural diagram of a system for solid-state storage and transportation of gas produced by marine combustible ice;
FIG. 2 is a schematic flow diagram of the process of the present invention;
wherein: 1. a mining platform; 2. a combustible ice synthesis pretreatment system; 21. a produced water storage device; 22. a production water treatment device; 23. a methane gas storage device; 3. a methane gas solid-stating device; 31. a device for rapidly synthesizing combustible ice; 32. a combustible ice compression and molding device; 4. a combustible ice storage device; 5. a piping system.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, the system for solid-state storage and transportation of the gas produced by ocean combustible ice comprises an exploitation platform 1, a combustible ice synthesis pretreatment system 2, a methane gas solid-state device 3, a combustible ice storage device 4 and a pipeline system 5; wherein:
the mining platform 1 is used for separating combustible ice into production water and methane gas, and the production water and the methane gas are conveyed into the combustible ice synthesis pretreatment system 2 through the pipeline system 5;
the combustible ice synthesis pretreatment system 2 pretreats production water and methane gas and conveys the pretreated production water and methane gas to the methane gas solid-stating device 3 through the pipeline system 5;
the methane gas solid stating device 3 is used for synthesizing combustible ice, compressing solid stating and modeling, and conveying the processed combustible ice to the combustible ice storage device 4 for storage and transportation.
In the specific implementation process, compared with the existing combustible ice storage and transportation, the invention synthesizes combustible ice by using methane gas and pure water, and provides the method for synthesizing combustible ice by using methane gas obtained by mining and produced water obtained by mining the combustible ice after treating the produced water in an ocean in-situ environment. And the industrial ecological storage and transportation of the gas produced by the combustible ice can be realized.
More specifically, the combustible ice synthesis pretreatment system 2 includes a production water storage device 21, a production water treatment device 22, and a methane gas storage device 23; wherein:
the production water storage device 21 connects and stores the production water from the mining platform 1 through the pipeline system 5, the production water is communicated with the production water treatment device 22 through the pipeline system 5, and a control valve is arranged on the pipeline system 5;
the production water treatment device 22 is used for performing multi-stage filtration separation and membrane permeation treatment on the stored production water, and connecting the treated production water into the methane gas solid-state device 3;
the methane gas storage device 23 receives and stores the methane gas from the exploitation platform 1 through the pipeline system 5, and an output port of the methane gas storage device is connected with the methane gas solid-stating device 3.
In the specific implementation process, the production water storage device 21 plays a role in storing production water on one hand, and on the other hand, silt in the production water is taken out through standing storage, and a silt discharging element is designed at the lower part of the production water storage device 21; meanwhile, in order to ensure the memory effect of the production water as much as possible in the storage process, the production water cannot be heated too high, and the outer wall of the production water storage device 21 is wrapped with an insulating layer and a water bath refrigeration jacket so as to ensure that the temperature of the production water is not higher than 25 ℃ in the whole storage process; the production water treatment device 22 mainly carries out multi-stage separation and membrane permeation on the production water produced by exploiting the combustible ice through a water treatment process, and removes silt and other impurities carried in the exploiting process so as to ensure that the quality of the treated production water can meet the requirement of forming the combustible ice. The methane gas storage device 23 mainly comprises a large gas storage tank and a pipeline system, and achieves the purpose of storing and buffering methane gas mined from combustible ice.
In the specific implementation process, the system not only utilizes the memory characteristic of the production water to synthesize the combustible ice, but also can carry out in-situ treatment and utilization on the production water, thereby avoiding the increase of the cost of transporting the production water back to land for treatment.
More specifically, the methane gas solid-stating device 3 comprises a device 31 for rapidly synthesizing combustible ice and a device 32 for compressing and molding the combustible ice; wherein:
the device 31 for rapidly synthesizing combustible ice comprises a cavity and a control circuit, wherein a spraying original piece is arranged at the top of the inner wall of the cavity, a micro-bubble fluid processing original piece is arranged at the bottom of the inner wall, and an accelerator spraying original piece and a stirring original piece are arranged in the middle of the inner wall; the outer wall of the cavity is covered with an annular wall cooling and explosion cooling system;
the spraying element, the microbubble fluid treatment element, the accelerator spraying element, the stirring element and the annular wall cooling and explosion system are all electrically connected with the control circuit and are controlled by the control circuit;
the device 31 for rapidly synthesizing the combustible ice is connected with the device 32 for compressing and molding the combustible ice through the pipeline system 5;
the combustible ice compressing and molding device 32 is used for filtering the combustible ice slurry synthesized in the rapid combustible ice synthesizing device 31, forming high-density blocky or spherical combustible ice as required, and transmitting the blocky or spherical combustible ice to the combustible ice storage device 4 through the pipeline system 5.
In the specific implementation process, the device 31 for rapidly synthesizing combustible ice mainly comprises a spraying element capable of uniformly spraying the injected processed production water in multiple directions, a microbubble fluid processing element for the methane gas injected from the methane gas storage device, an accelerator spraying element formed by injecting and spraying combustible ice, a stirring element with built-in enhanced mass transfer, and an outer-coated annular wall cooling and explosion system.
In the specific implementation process, the produced water is uniformly sprayed into the top of the device 31 for quickly synthesizing combustible ice, meanwhile, methane gas is introduced from the bottom of the device 31 for quickly synthesizing combustible ice from the methane gas storage device 23, the methane gas is separated by the microbubble fluid treatment element at the bottom of the device 31 for quickly synthesizing combustible ice, and then is fully mixed with the produced water sprayed from the top, and a certain amount of accelerant for forming combustible ice is sprayed through the wall surface, after the pressure in the device for synthesizing combustible ice is increased to the pressure (12-20MPa) for easily and quickly forming combustible ice, the temperature in the device is reduced to 4 ℃, and then the stirring element is started, so that the mass transfer rate is increased, and the synthesis of combustible ice is carried out. The stirring mode may adopt a continuous stirring mode or a sequencing batch stirring mode.
In the specific implementation process, after a large amount of combustible ice slurry is synthesized, the combustible ice slurry is introduced into a combustible ice compression and modeling device 32 from a device 31 for quickly synthesizing combustible ice, then the temperature and pressure conditions in the device are changed to ensure that the combustible ice can stably exist, the temperature in the device is firstly reduced to be between 15 ℃ below zero and 10 ℃ below zero, then the pressure in the device is reduced to ensure that the pressure in the device is 0.15 MPa to 2MPa, the combustible ice slurry is filtered to remove excessive moisture in the device, and then the filtered combustible ice slurry is compressed into a solid spherical or blocky high-quality combustible ice finished product according to the requirement.
More specifically, the combustible ice storage device 4 is a storage tank which is composed of 8 pressure-resistant tanks, can be carried on a ship and is convenient to load and unload for vehicle transportation; the top of the storage tank is provided with a pressure gauge and a built-in temperature sensor; the device is used for monitoring the temperature and the pressure of the pressure-resistant tank in real time.
More specifically, the top of the pressure-resistant tank is provided with a guide pipe, and the guide pipe is finally combined into a pipeline to be connected with the pressure-resistant tank which is not filled with combustible ice.
In the specific implementation process, after solid high-quality combustible ice is synthesized, the solid high-quality combustible ice is loaded into the combustible ice storage device 4, a small part of gas space is reserved at the top of each combustible ice storage tank, and each combustible ice storage tank is connected with an empty tank which is the same as the combustible ice storage tank through a drainage conduit. The empty tank is used for collecting methane gas released by decomposition of combustible ice caused by carelessness in the storage and transportation process. In the whole transportation process, the temperature and pressure value change of the combustible ice storage tank is monitored and paid attention to in real time, and a certain amount of combustible ice stabilizer is sprayed in the combustible ice storage tank.
In the specific implementation process, the combustible ice is quickly synthesized by pressurizing, cooling, spraying the accelerator, enhancing the mass transfer rate and the like in the device 31 for quickly synthesizing the combustible ice, and then the slurry of the combustible ice is cooled, decompressed and compressed for forming, so that the combustible ice can be transported in a long distance under a lower pressure environment, and compared with the transportation of liquefied natural gas, the high cost of ultralow-temperature (lower than-20 ℃) transportation is effectively avoided, and the explosion risk in the transportation process of the liquefied natural gas is reduced.
In the specific implementation process, the invention provides that a certain amount of combustible ice stabilizer is sprayed in the combustible ice storage tank, so that the stability of solid combustible ice can be effectively enhanced, and the decomposition of the combustible ice caused by external environment disturbance in the transportation process is avoided. The invention also provides a method for collecting methane gas which is released by careless decomposition in the storage and transportation process by connecting an empty gas storage tank with a combustible ice storage tank, which not only avoids the safety risk caused by gas release pressurization, but also collects the gas to be used at a terminal, can avoid the severe environment in the whole storage and transportation process, and realizes ecological storage and transportation.
Example 2
More specifically, on the basis of embodiment 1, as shown in fig. 2, a method for solid-stating storage and transportation of produced gas of marine combustible ice is provided, which comprises the following steps:
s1: the production water and the methane gas separated from the mining platform 1 are respectively connected into a combustible ice synthesis pretreatment system 2 through a pipeline system 5;
s2: the combustible ice synthesis pretreatment system 2 pretreats the produced water and the methane gas and then stores the pretreated produced water and the methane gas, and the pretreated produced water and the methane gas are connected into the methane gas solid-stating device 3 through a pipeline system 5;
s3: the methane gas solid-stating device 3 fully mixes the input methane gas with the production water, and sprays a certain amount of accelerant for forming combustible ice through the wall surface; when the pressure in the methane gas solid-stating device 3 is increased to 20MPa, the temperature in the device is reduced to 4 ℃, stirring is carried out, and combustible ice is synthesized;
s4: after a large amount of combustible ice slurry is synthesized, controlling the temperature of the methane gas solid-stating device 3 to be-15 ℃ and the pressure to be 1MPa, and condensing the combustible ice slurry into a solid spherical or blocky combustible ice finished product as required;
s5: after the solid combustible ice finished product is synthesized, the solid combustible ice is put into the combustible ice storage device 4, the temperature and the pressure in the device are monitored in real time, and environment guarantee is provided for subsequent transportation.
More specifically, in step S2, the combustible ice synthesis pretreatment system 2 stores and stands the production water by the production water storage device 21, and the temperature of the production water storage device 21 is controlled to be below 25 ℃ by the insulating layer and the water bath refrigeration jacket arranged on the outer wall of the production water storage device 21; then, the production water is subjected to multistage filtration separation and membrane permeation by the production water treatment device 22 by using a water treatment process to obtain production water meeting the water quality condition of rapidly forming combustible ice;
the combustible ice synthesis pretreatment system 2 buffers and stores methane gas obtained from the mining platform 1 through the methane gas storage device 23.
More specifically, in step S3, the methane gas solid-stating device 3 includes a combustible ice rapid synthesis device 31 and a combustible ice compression and molding device 32; wherein:
the device 31 for rapidly synthesizing combustible ice comprises a cavity and a control circuit, wherein a spraying original piece is arranged at the top of the inner wall of the cavity, a micro-bubble fluid processing original piece is arranged at the bottom of the inner wall, and an accelerator spraying original piece and a stirring original piece are arranged in the middle of the inner wall; the outer wall of the cavity is covered with an annular wall cooling and explosion cooling system;
the spraying element, the microbubble fluid treatment element, the accelerator spraying element, the stirring element and the annular wall cooling and explosion system are all electrically connected with the control circuit and are controlled by the control circuit;
the production water is uniformly sprayed into the rapid combustible ice synthesis device 31 through a spraying element on the top of the rapid combustible ice synthesis device 31, meanwhile, methane gas is introduced from the lower part of the rapid combustible ice synthesis device 31 in the methane gas storage device 23, and after being separated by a microbubble fluid treatment element at the bottom of the rapid combustible ice synthesis device 31, the methane gas is fully mixed with the production water sprayed on the top, and a certain amount of accelerant for forming combustible ice is sprayed through an accelerant spraying element; when the pressure in the device 31 for rapidly synthesizing combustible ice is increased to 20MPa, the temperature in the device is reduced to 4 ℃, and then the stirring element is started to enhance the mass transfer rate, so that the combustible ice is synthesized;
in step S4, after a large amount of combustible ice slurry is synthesized, the combustible ice slurry is introduced into the combustible ice compressing and molding device 32, excess water in the combustible ice slurry is filtered by setting the temperature of the combustible ice compressing and molding device 32 to-15 ℃ and the pressure of the combustible ice compressing and molding device 32 to not more than 1MPa, and the filtered combustible ice slurry is compressed into a solid spherical or blocky combustible ice product as required.
More specifically, in step S5, after the solid combustible ice is synthesized, the solid combustible ice is loaded into the combustible ice storage device 4, where the combustible ice storage device 4 is a storage tank composed of a plurality of pressure-resistant tanks; reserving a small part of gas space at the top of each pressure-resistant tank, and connecting each storage tank with a pressure-resistant tank which is not filled with combustible ice through a guide pipe to prevent methane gas from leaking;
in the transportation process, the temperature and the pressure in the device are monitored in real time, and environmental guarantee is provided for subsequent transportation.
In the specific implementation process, firstly, the produced water and the methane gas separated from the mining platform 1 are respectively connected into a produced water storage device 21 and a methane gas storage device 23 through pipelines; the low temperature environment in the production water storage device 21 is sufficiently ensured to retain the memory effect of the production water to reform combustible ice, and the production water enters the production water treatment device 22 after being temporarily left stand by the storage device. In order to sufficiently retain the memory effect of the produced water, the standing time is preferably not more than 24 hours. Impurities in the production water are removed by precipitation and membrane separation of the production water treatment device 22 and then uniformly sprayed into the rapid combustible ice synthesis device 31 through the top of the rapid combustible ice synthesis device 31. Meanwhile, methane gas is introduced from the lower part of the device 31 for quickly synthesizing combustible ice from the methane gas storage device 23, the methane gas is separated by a microbubble treatment element at the bottom of the device 31 for quickly synthesizing combustible ice, and then is fully mixed with production water sprayed from the top, and a certain amount of accelerator sodium dodecyl sulfate for forming combustible ice is sprayed through the wall surface, when the pressure in the device for synthesizing combustible ice is increased to 20MPa, the temperature in the device is reduced to 4 ℃, then a stirring element is started, the mass transfer rate is increased, the synthesis of combustible ice is carried out, and the stirring mode adopts a sequencing batch stirring mode. When the synthesis of a large amount of combustible ice slurry is monitored, the combustible ice slurry is led into a combustible ice compression and modeling device 32 from a device 31 for quickly synthesizing combustible ice, then the temperature in the device is reduced to-15 ℃, the pressure in the device is reduced to 1MPa, the combustible ice slurry is filtered to remove redundant moisture in the device, and then the filtered combustible ice slurry is compressed into a solid spherical or blocky high-quality combustible ice finished product according to the requirement. And after the solid high-quality combustible ice is synthesized, filling the solid high-quality combustible ice into 7 combustible ice storage tanks, reserving a small part of gas space at the top of each combustible ice storage tank, and connecting each combustible ice storage tank with one empty tank through a drainage catheter. The empty tank is used for collecting methane gas released by decomposition of combustible ice caused by carelessness in the storage and transportation process. In the whole transportation process, the temperature and pressure value change of the combustible ice storage tank is monitored and paid attention to in real time, and a certain amount of combustible ice stabilizer hydroxyethyl cellulose is sprayed in the combustible ice storage tank.
In the specific implementation process, the system and the method for solid-state storage and transportation of the gas produced by ocean combustible ice provided by the invention have the advantages that the combustible ice is synthesized by utilizing the memory characteristic of produced water, and meanwhile, the combustible ice is synthesized, cooled, decompressed and compressed and formed by the methane gas solid-state device, so that the combustible ice is transported in a long distance in a low-pressure environment, the high cost of ultralow-temperature transportation is effectively avoided, and the explosion risk in the transportation process of liquefied natural gas is reduced.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. A solid-state storage and transportation system for gas exploitation of ocean combustible ice is characterized by comprising an exploitation platform (1), a combustible ice synthesis pretreatment system (2), a methane gas solid-state device (3), a combustible ice storage device (4) and a pipeline system (5); wherein:
the mining platform (1) is used for decomposing deep sea combustible ice to obtain methane gas and production water, and the production water and the methane gas are conveyed into the combustible ice synthesis pretreatment system (2) through the pipeline system (5);
the combustible ice synthesis pretreatment system (2) pretreats production water and methane gas and conveys the water and the methane gas to the methane gas solid-stating device (3) through the pipeline system (5);
the methane gas solid-stating device (3) is used for synthesizing combustible ice, compressing solid-stating and molding, and conveying the processed combustible ice to the combustible ice storage device (4) for storage and transportation;
the combustible ice synthesis pretreatment system (2) comprises a production water storage device (21), a production water treatment device (22) and a methane gas storage device (23); wherein:
the production water storage device (21) connects and stores the production water from the mining platform (1) through the pipeline system (5), the production water storage device is communicated with the production water treatment device (22) through the pipeline system (5), and a control valve is arranged on the pipeline system (5);
the production water treatment device (22) is used for carrying out multi-stage filtration separation and membrane permeation treatment on the stored production water and connecting the treated production water into the methane gas solid state device (3);
the methane gas storage device (23) is used for receiving and storing methane gas from the exploitation platform (1) through the pipeline system (5), and an output port of the methane gas storage device is connected with the methane gas solid-stating device (3);
the methane gas solid-stating device (3) comprises a device (31) for quickly synthesizing combustible ice and a device (32) for compressing and molding the combustible ice; wherein:
the device (31) for rapidly synthesizing combustible ice comprises a cavity and a control circuit, wherein a spraying original piece is arranged at the top of the inner wall of the cavity, a micro-bubble fluid processing original piece is arranged at the bottom of the inner wall, and an accelerator spraying original piece and a stirring original piece are arranged in the middle of the inner wall; an annular wall cooling and cold insulation system covers the outer wall of the cavity;
the spraying element, the microbubble fluid treatment element, the accelerator spraying element, the stirring element and the annular wall cooling and cold insulation system are electrically connected with the control circuit and are controlled by the control circuit;
the device (31) for rapidly synthesizing the combustible ice is connected with the device (32) for compressing and molding the combustible ice through the pipeline system (5);
the combustible ice compression and modeling device (32) is used for filtering the combustible ice slurry synthesized in the rapid combustible ice synthesis device (31), forming high-density blocky or spherical combustible ice according to requirements, and transmitting the blocky or spherical combustible ice to the combustible ice storage device (4) through the pipeline system (5).
2. The ocean combustible ice production gas solid-state storage and transportation system according to claim 1, wherein the outer wall of the production water storage device (21) is wrapped with an insulating layer and a water bath refrigeration jacket.
3. The ocean combustible ice mining gas solid-stating storage and transportation system according to claim 1, characterized in that the combustible ice storage device (4) is a storage tank consisting of a plurality of pressure-resistant tanks; the top of the storage tank is provided with a pressure gauge and a built-in temperature sensor; the device is used for monitoring the temperature and the pressure of the pressure-resistant tank in real time.
4. The system for solid-state storage and transportation of marine combustible ice exploitation gas as claimed in claim 3, wherein the top of the pressure-resistant tank is provided with a conduit, and the conduit is finally combined into a pipeline to be connected with a pressure-resistant tank which is not filled with combustible ice.
5. A method for solid-state storage and transportation of gas produced by ocean combustible ice is characterized by comprising the following steps:
s1: the production water and the methane gas separated from the mining platform (1) are respectively connected into a combustible ice synthesis pretreatment system (2) through a pipeline system (5);
s2: the combustible ice synthesis pretreatment system (2) pretreats the produced water and the methane gas and then stores the pretreated produced water and the methane gas, and the pretreated produced water and the methane gas are connected into the methane gas solid-stating device (3) through a pipeline system (5);
s3: the methane gas solid-stating device (3) fully mixes the input methane gas with the production water, and sprays a certain amount of accelerant for forming combustible ice through the wall surface; when the pressure in the methane gas solid-stating device (3) is increased to 12-20MPa, the temperature in the device is reduced to 4 ℃, stirring is carried out, and combustible ice is synthesized;
s4: after a large amount of combustible ice slurry is synthesized, reducing the temperature of the methane gas solid-stating device (3) to-15 ℃ to-10 ℃, then reducing the pressure in the device to ensure that the pressure does not exceed 2MPa, and condensing the combustible ice slurry into solid spherical or blocky combustible ice finished products as required;
s5: after the solid combustible ice finished product is synthesized, the solid combustible ice is put into a combustible ice storage device (4), and the temperature and the pressure in the device are monitored in real time, so that the environment guarantee is provided for the subsequent transportation;
in the step S3, the methane gas solid-stating device (3) comprises a device (31) for rapidly synthesizing combustible ice and a device (32) for compressing and molding the combustible ice; wherein:
the device (31) for rapidly synthesizing combustible ice comprises a cavity and a control circuit, wherein a spraying original piece is arranged at the top of the inner wall of the cavity, a micro-bubble fluid processing original piece is arranged at the bottom of the inner wall, and an accelerator spraying original piece and a stirring original piece are arranged in the middle of the inner wall; the outer wall of the cavity is covered with an annular wall cooling and explosion cooling system;
the spraying element, the microbubble fluid treatment element, the accelerator spraying element, the stirring element and the annular wall cooling and explosion system are all electrically connected with the control circuit and are controlled by the control circuit;
the production water is uniformly sprayed into the rapid combustible ice synthesis device (31) through a spraying element at the top of the rapid combustible ice synthesis device (31), meanwhile, methane gas in a methane gas storage device (23) is introduced from the lower part of the rapid combustible ice synthesis device (31), the methane gas is fully mixed with the production water sprayed at the top after being separated by a microbubble fluid treatment element at the bottom of the combustible ice synthesis device (31), and a certain amount of accelerant for forming the combustible ice is sprayed through an accelerant spraying element; when the pressure in the device (31) for rapidly synthesizing combustible ice is increased to 12-20MPa, the temperature in the device is reduced to 4 ℃, and then a stirring element is started to enhance the mass transfer rate, so that combustible ice synthesis is carried out;
in step S4, after a large amount of combustible ice slurry is synthesized, the combustible ice slurry is introduced into a combustible ice compression and molding device (32), the temperature of the combustible ice compression and molding device (32) is reduced to ensure that the temperature range is-15 to 10 ℃, the pressure in the device is reduced to ensure that the pressure range is 0.15 to 2MPa, then, the excess moisture in the combustible ice slurry is removed by filtration, and the filtered combustible ice slurry is compressed into a solid spherical or blocky combustible ice finished product as required.
6. The method for solid-state storage and transportation of mining gas of ocean combustible ice according to claim 5, wherein in the step S2, the combustible ice synthesis pretreatment system (2) stores and stands the production water through the production water storage device (21), and the temperature of the production water storage device (21) is controlled below 25 ℃ by an insulating layer and a water bath refrigeration jacket which are arranged on the outer wall of the production water storage device (21); then, the production water is subjected to multistage filtration separation and membrane permeation by a production water treatment process through a production water treatment device (22) so as to obtain the production water with the water quality meeting the requirement of quickly forming combustible ice;
the combustible ice synthesis pretreatment system (2) buffers and stores methane gas obtained from the mining platform (1) through a methane gas storage device (23).
7. The method for solid-state storage and transportation of mining gas of ocean combustible ice according to claim 5, wherein in step S5, after solid-state combustible ice is synthesized, the solid-state combustible ice is loaded into a combustible ice storage device (4), wherein the combustible ice storage device (4) is a storage tank consisting of a plurality of pressure-resistant tanks; reserving a small part of gas space at the top of each pressure-resistant tank, and connecting each storage tank with a pressure-resistant tank which is not filled with combustible ice through a guide pipe to prevent methane gas from leaking;
in the transportation process, the temperature and the pressure in the device are monitored in real time, and environmental guarantee is provided for subsequent transportation.
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| PCT/CN2021/073885 WO2021238290A1 (en) | 2020-05-28 | 2021-01-27 | System and method for solid-state storage and transportation of gas obtained from marine combustible ice mining |
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| CN112709552B (en) * | 2020-10-19 | 2022-03-08 | 青岛海洋地质研究所 | Device and method for developing marine natural gas hydrate system based on hydrate method |
| CN113187444A (en) * | 2021-05-08 | 2021-07-30 | 王智刚 | Mining and safe storage and transportation technology of deep-sea combustible ice |
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