CN217835963U - Offshore methanol production platform with self-sufficient energy and carbon capture function - Google Patents
Offshore methanol production platform with self-sufficient energy and carbon capture function Download PDFInfo
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- CN217835963U CN217835963U CN202220128105.5U CN202220128105U CN217835963U CN 217835963 U CN217835963 U CN 217835963U CN 202220128105 U CN202220128105 U CN 202220128105U CN 217835963 U CN217835963 U CN 217835963U
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Abstract
The invention discloses an offshore methanol production platform with self-sufficient energy and a carbon capture function, which relates to the technical field of ocean engineering and comprises a platform supported on the sea through a support mechanism; the platform is provided with an exhaust gas conveying pipeline which is communicated with the drilling platform and used for collecting exhaust gas generated by the drilling platform; the platform is also provided with a waste gas storage tank, the waste gas conveying pipeline is communicated with an input port of the waste gas storage tank, an output port of the waste gas storage tank is communicated with the burnt carbon dioxide capturing system, and the burnt carbon dioxide capturing system is used for communicating carbon dioxide separated from waste gas with the carbon dioxide storage tank; the carbon dioxide storage tank is communicated with the methanol production system. The invention can effectively solve the problem of carbon dioxide emission of peripheral offshore platforms and reduce the risk of secondary leakage of the carbon sequestration technology.
Description
Technical Field
The invention relates to the technical field of ocean engineering, in particular to an offshore methanol production platform with self-sufficient energy and a carbon capture function.
Background
Various industries strive to explore how to reduce carbon and even not discharge carbon so as to reduce greenhouse effect and protect atmospheric environment. Especially after the carbon trading market is opened, for enterprises, reducing carbon emission is equivalent to saving expenses, and even redundant carbon quota can be sold to obtain profits, so that the carbon emission reduction is economical, and the enterprises are stimulated to reduce carbon unnecessarily. In the field of ocean engineering, most offshore platforms such as drilling platforms and pressurizing platforms are far off the shore, shore power cannot be used, and the requirements on energy sources such as high power and high stability are met, so that the traditional diesel engine is still used as a main energy supply means. This results in continuous large carbon emissions during operation, contrary to the current two-carbon policy. In addition, in view of the particularity of the offshore environment, the carbon reduction difficulty is high, the maintenance is difficult, and the cost is high.
Various carbon capture, carbon sequestration technologies are currently in force in an effort to reduce carbon emissions. However, carbon capture requires a large amount of energy consumption, and carbon may be generated while capturing carbon; the carbon sequestration technology, whether land sequestration or ocean sequestration, is not enough to prove the reliability and effectiveness at present, and leakage may occur under extreme geological or meteorological conditions, causing greater harm.
Methanol is an important chemical basic raw material, can be used for preparing various products such as olefin, aldehyde, ester, ether and the like, and has wide application in the fields of pesticide, medicine, chemical industry, plastics and the like. Meanwhile, methanol is also an important clean fuel, the demand for the methanol fuel is greatly increased under the condition that the policy promotes the great development of fuel cells, and the popularization and application of the methanol fuel are also beneficial to the energy structure transformation of China. The current preparation method of methanol mainly uses natural gas or coal as raw materials to prepare the methanol through a series of chemical process flows, so that the consumption of fossil raw materials is increased, carbon emission can not be avoided in the methanol production process, and the method is neither economical nor environment-friendly.
Disclosure of Invention
The invention aims to provide an offshore methanol production platform which is self-sufficient in energy and has a carbon capture function, not only can not generate any carbon emission per se so as to effectively solve the problem of carbon dioxide emission of peripheral offshore platforms, but also reduces the risk of secondary leakage of a carbon sequestration technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
an offshore methanol production platform with self-sufficient energy and carbon capture function comprises a platform supported on the sea through a support mechanism;
the platform is provided with an exhaust gas conveying pipeline which is communicated with the drilling platform and used for collecting exhaust gas generated by the drilling platform;
the platform is also provided with a waste gas storage tank, the waste gas conveying pipeline is communicated with an input port of the waste gas storage tank, an output port of the waste gas storage tank is communicated with the burnt carbon dioxide capturing system, and the burnt carbon dioxide capturing system is used for communicating carbon dioxide separated from waste gas with the carbon dioxide storage tank;
the carbon dioxide storage tank is communicated with the methanol production system.
The platform comprises an offshore fixed jacket structure, and the offshore fixed jacket structure comprises an upper module, a jacket and a pile foundation; the upper module comprises an upper deck and a lower deck; the guide pipe frame is correspondingly inserted into a pile foundation arranged on the seabed.
The platform is provided with a wind driven generator and a solar cell panel.
4 vertical axis wind driven generators are arranged on the platform, and the 4 vertical axis wind driven generators are respectively arranged at 4 corners of the upper deck.
A set of seawater desalination device is arranged on the platform and communicated with the seawater lift pump.
The platform is also provided with an electrolyzed water module communicated with the seawater desalination device, the electrolyzed water module comprises an electrolytic bath device, a gas-liquid separation device, a hydrogen purification device and a hydrogen and oxygen storage tank, and a hydrogen product obtained by the electrolyzed water module is communicated with the methanol production system.
The post-combustion carbon dioxide capture system is based on a process flow of a chemical absorption method.
The platform is also provided with a methanol storage tank.
The methanol storage tank is communicated with the land through a submarine pipeline.
The methanol production system is based on the technological process of carbon dioxide water vapor inverse transformation and synthesis coupling reaction recycling.
More specifically, the following:
a self-sufficient and carbon capture function of the energy offshore methanol production platform, the platform adopts the offshore fixed jacket structure, mainly by the upper portion chunk, the jacket, the pile foundation three parts is formed. The upper module is the main body of the platform and is divided into an upper deck and a lower deck, and the upper deck and the lower deck are rectangular; the jacket has 6 legs, and is correspondingly inserted into 6 pile foundations on the seabed.
The offshore methanol production platform with self-sufficient energy and the carbon capture function has the following energy sources: the wind-solar hybrid power system consisting of the vertical axis wind driven generator, the solar panel and the lithium battery energy storage device does not need external energy, does not produce waste gas emission, and is green and environment-friendly. 4 vertical axis aerogenerators are arranged at 4 corners of the upper deck, and the occupied space is small. The vertical axis wind driven generator can effectively reduce the height of the fan and is beneficial to installation and maintenance on the sea. Solar panel arranges the upper deck, and lithium cell energy memory and distribution system arrange at the lower deck.
The offshore methanol production platform with self-sufficient energy and the carbon capture function is suitable to be arranged at a position close to a plurality of offshore drilling platforms, so that waste gas generated by the offshore drilling platforms can be collected conveniently; an exhaust gas storage tank is arranged on the upper deck, and exhaust gas generated when the peripheral offshore drilling platform operates is directly conveyed to the exhaust gas storage tank through a pipeline for temporary storage.
The offshore methanol production platform with self-sufficient energy and the carbon capture function is characterized in that a carbon dioxide storage tank is arranged on an upper deck and used for storing carbon dioxide captured by a post-combustion capture technology for waste gas; and also for storing carbon dioxide transported by the carbon dioxide transport vessel to the platform for disposal.
According to the offshore methanol production platform with self-sufficient energy and the carbon capture function, the lower deck is provided with the seawater desalination device, and a part of seawater lifted to the platform through the seawater lifting pump is desalinated. Another part of the lifted seawater is used as cooling water. The lower deck is also provided with a set of electrolyzed water module which specifically comprises an electrolytic bath device, a gas-liquid separation device, a hydrogen purification device and a hydrogen and oxygen storage tank and is used for electrolyzing the desalted water to prepare hydrogen and oxygen, wherein the hydrogen is used as a raw material for methanol production, and the oxygen can be collected as a byproduct and can also be directly discharged into the atmosphere.
The offshore methanol production platform is self-sufficient in energy and has the carbon capture function, the carbon dioxide capture module after combustion is arranged on the lower deck, the gas in the waste gas storage tank is captured by the carbon dioxide capture module after combustion, the carbon dioxide capture method after combustion is adopted, the fixation investment is less, the system is independent and flexible, the principle is simple, the technology is mature, and the offshore methanol production platform is the technology most suitable for capturing the carbon dioxide by the offshore platform. The carbon dioxide separation technology adopted in the method is a chemical absorption method, and the principle is as follows: enabling carbon dioxide in the waste gas to react with the absorbent chemically, absorbing the carbon dioxide in the gas, and discharging the rest gas into the atmosphere; then the absorbent is heated to decompose the carbon dioxide again, thereby achieving the purpose of separating and recovering the carbon dioxide. The chemical absorption method has the advantages of large gas treatment capacity, high carbon dioxide recovery rate and mature technology, and is suitable for offshore platforms.
According to the offshore methanol production platform with self-sufficient energy and the carbon capture function, the lower deck is provided with the set of methanol production modules, the captured carbon dioxide and hydrogen prepared by electrolyzed water are used as raw materials, the technological processes of carbon dioxide and water vapor inverse transformation and synthesis coupling reaction recycling are mainly adopted, and the offshore methanol production platform has the characteristics of simple equipment, mild reaction conditions, mature technology, high carbon conversion rate and high methanol generation rate. Two methanol storage tanks are contained in the methanol production module and are used for collecting the produced product methanol. The methanol can be transported to various ports by special transport vessels, or submarine pipelines can be constructed to be directly transported to land from the platform.
By adopting the technical scheme of the invention, the following beneficial effects can be obtained:
(1) Compared with land-based methanol production plants, the method does not occupy valuable land resources.
(2) Compared with onshore methanol production plants, the offshore methanol production platform can collect and process carbon dioxide discharged by other offshore drilling platforms nearby, and the problem that a large amount of carbon dioxide generated in the operation of an offshore engineering project is difficult to process is solved.
(3) Compared with a land-based methanol production plant, the wind energy and the light energy on the sea are more sufficient than those on the land, the energy used by the offshore methanol production platform is completely from green energy sources such as wind and light, is self-sufficient, has no continuous energy source cost, does not cause extra carbon emission, and is economical and environment-friendly.
(4) Compared with the traditional methanol production plant which uses coal or natural gas as raw materials, the offshore methanol production platform only uses waste gas and seawater as raw materials, changes waste into valuable, has sufficient raw materials and no cost, and can also make extra profit by performing carbon capture on the waste gas even under the condition that carbon trading is open.
(5) Compared with a carbon sequestration technology with safety and reliability to be verified, the carbon sequestration platform adopts a carbon circulation concept to reduce carbon emission, uses carbon dioxide as a raw material to prepare other industrial finished products, achieves the purposes of carbon sequestration and energy storage, and is mature in technology, safe and reliable.
(6) Compared with the common carbon sequestration technology, the platform can fix carbon, and meanwhile, the platform can obtain profits through carbon reduction and produced methanol products, and has remarkable economic benefit.
In conclusion, the invention can protect the atmospheric environment, reduce the greenhouse effect, produce methanol, have good economic benefit, and is a green offshore platform with environmental protection and economy
Drawings
Fig. 1 is a general arrangement diagram of the sea area of the present invention.
Fig. 2 is a platform elevation of the present invention.
Figure 3 is a plan view of the upper deck of the present invention.
Figure 4 is a plan view of the lower deck of the present invention.
FIG. 5 is a process flow diagram of a post-combustion carbon dioxide capture system of the present invention.
FIG. 6 is a process flow diagram of a methanol production system of the present invention.
In the drawings, the reference numbers are respectively:
in fig. 1: 101-offshore methanol production platform, 102, 103, 104-surrounding drilling platform, 105-exhaust gas transfer line, 106-remote offshore platform, 107-onshore plant, 108-carbon dioxide carrier.
In fig. 2: 201-jacket, 202-jacket to upper block connection, 203-upper block, 204-upper deck, 205-lower deck, 206-seawater lift pump, 207-pump tower, 208-landing, 209-stairway, 210-waste gas line.
In fig. 3: 301-vertical axis wind turbine, 302-solar panel, 303-waste gas storage tank, 304-carbon dioxide storage tank, 305-office living area, 306-helicopter deck, 307-crane.
In fig. 4: 401-a seawater desalination module, 402-an electrolytic water module, 403-a burned carbon dioxide capture module, 404-a methanol production module, 405-a power distribution equipment room, and 406-a storage battery room.
In fig. 5: 501-fan, 502-absorption tower, 503-rich liquid pump, 504-regeneration tower, 505-reboiler, 506-lean liquid pump, 507-lean-rich liquid heat exchanger, 508-lean liquid cooler.
In fig. 6: 601-coupling reactor, 602-heat exchanger, 603-condenser, 604-pump, 605-methanol refining device, 606-methanol storage tank, 607-compressor.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, which is a general arrangement diagram of the sea area of the present invention, the offshore methanol production platform 101 with self-sufficient energy and carbon capture function of the present invention is preferably installed in a sea area rich in oil and gas fields with a plurality of drilling platforms around, such as the bohai sea and the south sea area in China. In the operation process of the surrounding drilling platforms 102, 103 and 104, the waste gas generated by the diesel engine is desulfurized and dedusted, and then is directly conveyed to the offshore methanol production platform 101 through a waste gas conveying pipeline 105 for subsequent carbon capture treatment. Carbon dioxide produced at a remote offshore platform 106 or an onshore facility 107 can be captured and transported by a carbon dioxide carrier 108 to the offshore methanol production platform 101 for storage as a feedstock.
As shown in fig. 2-the elevation of the platform of the invention, the offshore methanol production platform 101 with self-sufficient energy and carbon capture function of the invention adopts an offshore fixed jacket structure, firstly, a jacket 201 is placed on the seabed, then, piles are driven, and then, an upper block 203 is welded above the jacket through a jacket and upper block connecting structure 202, so that the offshore methanol production platform 101 is installed. The upper block 203 is divided into two layers, consisting of an upper deck 204 and a lower deck 205. In addition, a seawater lift pump 206 is located below the sea surface and is secured to the jacket by a pump tower 207. Platform personnel can go up and down the platform via the boarding platform 208 and go to the different decks of the platform via the stairways 209. The exhaust from the other drilling platforms is conveyed to the platform via exhaust line 210.
As shown in fig. 3-plan view of the upper deck of the present invention, the offshore methanol production platform 101 with self-sufficient energy and carbon capture function of the present invention has 4 vertical axis wind turbines 301 arranged at four corners of the upper deck 204, and the vertical axis wind turbines can effectively reduce the height of the wind turbine and facilitate the installation and maintenance on the sea. The upper deck is also provided with a plurality of solar panels 302, and wind energy and solar energy constitute the energy source of the platform. Furthermore, there are arranged two waste gas tanks 303, two carbon dioxide tanks 304, a living office 305, a helicopter deck 306, and a crane 307.
As shown in fig. 4-a plan view of the lower deck of the present invention, an offshore methanol production platform 101 with self-contained energy and carbon capture capability according to the present invention has a seawater desalination module 401, an electrolyzed water module 402, a post-combustion carbon dioxide capture module 403, a methanol production module 404, a power distribution equipment room 405, and a battery room 406 disposed on the lower deck 205. The seawater desalination module 401 is used for desalinating seawater pumped up by the seawater lift pump 206, fresh water is used for generating hydrogen and oxygen by the subsequent electrolyzed water module 402, and the electrolyzed water module specifically comprises an electrolytic cell device, a gas-liquid separation device, a hydrogen purification device and a hydrogen and oxygen storage tank. The hydrogen is used as a raw material for the subsequent production of methanol, and the oxygen can be stored as a byproduct and can also be directly discharged into the atmosphere. The roles of the post-combustion carbon dioxide capture module 403 and the methanol production module 404 are detailed in fig. 5, fig. 6.
As shown in fig. 5, a process flow diagram of the post-combustion carbon dioxide capture system of the present invention, the present invention is a self-sufficient energy and carbon capture offshore methanol production platform 101, wherein the post-combustion carbon dioxide capture module on the platform separates and captures carbon dioxide by a chemical absorption method, and the chemical absorption agent uses an ethanolamine (MEA) solution. The specific process flow is as follows: the gas in the waste gas storage tank 303 is conveyed to the bottom of the absorption tower 502 through the fan 501, and is in reverse contact with the absorbent MEA solution (lean solution) sprayed from top to bottom to perform chemical reaction. The decarbonized and non-contaminated gas is discharged into the atmosphere from the top of the column, and the MEA solution (rich solution) having absorbed carbon dioxide is discharged from the bottom of the column and sent to the regeneration tower 504 by the rich solution pump 503 for desorption and regeneration. By heating the regeneration tower by the reboiler 505, the rich MEA solution will be thermally decomposed, and the released carbon dioxide will come out from the top of the regeneration tower and be transported to the carbon dioxide storage tank 304 for storage as a raw material. After releasing carbon dioxide, the rich MEA solution is changed into a lean MEA solution, and the lean MEA solution is transported by a lean solution pump 506, and first passes through a lean solution and rich solution heat exchanger 507, where the lean solution exchanges heat, and then is sent to a lean solution cooler 508 (using open seawater circulation cooling) for further cooling, and then returned to the top of the absorption tower for recycling.
As shown in fig. 6, which is a process flow diagram of a methanol production system of the present invention, the offshore methanol production platform 101 with self-sufficient energy and carbon capture function of the present invention mixes carbon dioxide and hydrogen on the platform and then introduces them into a coupling reactor 601, where the reaction is divided into two parts: the inverse transformation reaction of water and vapor is firstly carried out in the upper half section of the reactor, and after the reaction is carried out at the temperature of 220 ℃ and the pressure of 3.0Mpa and under the action of a catalyst, typical gas components comprise carbon monoxide, carbon dioxide, hydrogen and water vapor. Then the gas enters the lower half section of the coupling reactor, and further reaction for synthesizing the methanol is carried out under the action of a copper-based catalyst. After the reaction, the mixed gas is discharged from the reactor, primarily cooled by a heat exchanger 602, and then cooled (by adopting open circulation cooling with seawater) in a condenser 603, the cooled liquid phase product is a mixture of crude product methanol and water, and is conveyed to a methanol refining device 605 by a pump 604, and the prepared refined methanol is conveyed to a methanol storage tank 606 for storage. The gas which cannot be liquefied in the condenser 603 is mixed gas which is not completely reacted in the coupling reactor 601, and is sent to the heat exchanger 602 through the circulating compressor 607, exchanges heat with the product at the outlet of the coupling reactor 601, then is sent back to the inlet at the top of the upper half section of the reactor, is mixed with the raw material gas, and then reacts in the coupling reactor 601 again. Therefore, the reaction rate of carbon can be improved, the energy consumption is saved, and more methanol products can be obtained.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (10)
1. An offshore methanol production platform with self-sufficient energy and carbon capture function is characterized by comprising a platform supported on the sea through a support mechanism;
the platform is provided with an exhaust gas conveying pipeline which is communicated with the drilling platform and used for collecting exhaust gas generated by the drilling platform;
the platform is also provided with a waste gas storage tank, the waste gas conveying pipeline is communicated with an input port of the waste gas storage tank, an output port of the waste gas storage tank is communicated with a post-combustion carbon dioxide capturing system, and the post-combustion carbon dioxide capturing system is used for communicating carbon dioxide separated from waste gas with the carbon dioxide storage tank;
the carbon dioxide storage tank is communicated with the methanol production system.
2. The offshore methanol production platform with self-sufficiency of energy and carbon capture capability of claim 1, wherein said platform comprises an offshore stationary jacket structure comprising an upper block, a jacket, and a pile foundation; the upper block comprises an upper deck and a lower deck; the jacket is correspondingly inserted into the pile foundation arranged on the seabed.
3. The offshore methanol production platform with self-sufficient energy and carbon capture capability of claim 1, wherein a wind turbine and a solar panel are disposed on the platform.
4. The offshore methanol production platform with self-sufficient energy and carbon capture function according to claim 2, characterized in that 4 vertical axis wind turbines are arranged on the platform, and the 4 vertical axis wind turbines are respectively arranged at 4 corners of the upper deck.
5. The offshore methanol production platform with self-sufficient energy and carbon capture functions of claim 1, wherein a set of seawater desalination units is arranged on the platform, and the seawater desalination units are communicated with a seawater lift pump.
6. The offshore methanol production platform with self-sufficient energy and carbon capture function of claim 5, wherein the platform is further provided with an electrolyzed water module communicated with the seawater desalination device, the electrolyzed water module comprises an electrolytic cell device, a gas-liquid separation device, a hydrogen purification device and a hydrogen and oxygen storage tank, and a hydrogen product obtained by the electrolyzed water module is communicated with the methanol production system.
7. The self-sufficient-energy-source and carbon-capture-capable offshore methanol production platform of claim 1, wherein the post-combustion carbon dioxide capture system is based on a chemical absorption process flow.
8. The offshore methanol production platform with self-sufficient energy and carbon capture capability of claim 1, wherein a methanol storage tank is further provided on the platform.
9. The offshore methanol production platform with self-sufficient energy and carbon capture capability of claim 8, wherein the methanol storage tank is connected to land via a subsea pipeline.
10. The offshore methanol production platform with self-sufficient energy and carbon capture capability of claim 1, wherein the methanol production system is based on a carbon dioxide water vapor reverse transformation, synthetic coupled reaction recycle process.
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| CN202220128105.5U CN217835963U (en) | 2022-01-18 | 2022-01-18 | Offshore methanol production platform with self-sufficient energy and carbon capture function |
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| CN202220128105.5U CN217835963U (en) | 2022-01-18 | 2022-01-18 | Offshore methanol production platform with self-sufficient energy and carbon capture function |
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