CN117599694A - Methanol synthesis system and method for premixing carbon dioxide and hydrogen - Google Patents

Methanol synthesis system and method for premixing carbon dioxide and hydrogen Download PDF

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Publication number
CN117599694A
CN117599694A CN202311520982.2A CN202311520982A CN117599694A CN 117599694 A CN117599694 A CN 117599694A CN 202311520982 A CN202311520982 A CN 202311520982A CN 117599694 A CN117599694 A CN 117599694A
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hydrogen
carbon dioxide
unit
regulating valve
premixing
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Inventor
谢佳家
张�杰
张志亮
童晓凡
高阳
翟云楚
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China Energy Engineering Group Zhejiang Eleteric Power Design Institute Co ltd
Innovation And Entrepreneurship Center Of State Grid Zhejiang Electric Power Co ltd
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China Energy Engineering Group Zhejiang Eleteric Power Design Institute Co ltd
Innovation And Entrepreneurship Center Of State Grid Zhejiang Electric Power Co ltd
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Priority to CN202311520982.2A priority Critical patent/CN117599694A/en
Publication of CN117599694A publication Critical patent/CN117599694A/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/15—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively
    • C07C29/151—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases
    • C07C29/152—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases characterised by the reactor used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/10—Mixing gases with gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J12/00—Chemical processes in general for reacting gaseous media with gaseous media; Apparatus specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J4/00—Feed or outlet devices; Feed or outlet control devices
    • B01J4/02—Feed or outlet devices; Feed or outlet control devices for feeding measured, i.e. prescribed quantities of reagents
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/50—Carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
    • H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
    • H02S10/12—Hybrid wind-PV energy systems

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The invention relates to the field of methanol production, and discloses a methanol synthesis system and a method for premixing carbon dioxide and hydrogen, wherein the output end of a hydrogen production unit is sequentially connected with a hydrogen storage unit and a hydrogen regulating valve; the output end of the carbon dioxide capturing unit is sequentially connected with a carbon dioxide storage unit and a carbon dioxide regulating valve; the mixing unit is connected with the output end of the hydrogen mass flowmeter and the carbon dioxide mass flowmeter, the output end of the mixing unit is sequentially connected with the compression unit, the reaction unit and the separation unit, and the mixing unit is used for premixing carbon dioxide and hydrogen and storing mixed gas after mixing; the carbon dioxide regulating valve and the hydrogen regulating valve are respectively used for controlling the quality of hydrogen and carbon dioxide entering the mixing unit; the invention mixes the carbon dioxide and the hydrogen in advance, controls the mixing proportion of the carbon dioxide and the hydrogen, improves the production efficiency of the methanol, and simultaneously avoids the problem that the high-purity hydrogen is difficult to compress.

Description

Methanol synthesis system and method for premixing carbon dioxide and hydrogen
Technical Field
The invention relates to the field of methanol synthesis, in particular to a methanol synthesis system and method for premixing carbon dioxide and hydrogen.
Background
At present, the types of process systems using carbon dioxide as a reaction raw material are numerous, but from the aspects of mass production application and market demand, the hydrogenation of carbon dioxide to prepare methanol is one of the processes with the greatest research and application value, and the methanol is both a chemical raw material and an energy substance, so that the application field is very wide. The carbon dioxide in the methanol synthesis process by the carbon dioxide and the hydrogen can be obtained by capturing in the places such as air, power plants, chemical plants and the like, so that the zero emission of carbon in the methanol synthesis process is realized, the generation of greenhouse gases is reduced, methanol with high added product value can be generated, and social and economic benefits are achieved. At present, a direct synthesis method is generally adopted in the process of synthesizing methanol by hydrogenation of carbon dioxide, and the use efficiency of carbon dioxide and hydrogen raw materials has great fluctuation under the process conditions of different mass mixing ratios of carbon dioxide and hydrogen, so that the production efficiency of methanol is affected.
In addition, because the hydrogen has smaller relative molecular mass and cannot be compressed into a liquid state at normal temperature, the problem of low compression efficiency and difficult compression exists in compressing large-volume hydrogen, more energy and storage tanks are required to be consumed in compressing and transferring the hydrogen before mixing with carbon dioxide, and the transportation is dangerous.
Disclosure of Invention
The invention aims to solve the technical problems that: how to conveniently adjust the mixing ratio of carbon dioxide and hydrogen, thereby improving the production efficiency of methanol and solving the problem of compressing and conveying high-purity hydrogen. In order to solve the above technical problems, the present invention provides a methanol synthesis system and method for premixing carbon dioxide and hydrogen, comprising:
the output end of the hydrogen production unit is sequentially connected with a hydrogen storage unit, a hydrogen regulating valve and a hydrogen mass flowmeter;
the output end of the carbon dioxide capturing unit is sequentially connected with a carbon dioxide storage unit, a carbon dioxide regulating valve and a carbon dioxide mass flowmeter;
the mixing unit is connected with the output end of the hydrogen mass flowmeter and the carbon dioxide mass flowmeter, the output end of the mixing unit is sequentially connected with the compression unit, the reaction unit and the separation unit, and the mixing unit is used for premixing carbon dioxide and hydrogen and storing mixed gas after mixing;
the hydrogen mass flowmeter and the carbon dioxide mass flowmeter are respectively used for monitoring the mass of the hydrogen and the carbon dioxide entering the mixing unit, and the carbon dioxide regulating valve and the hydrogen regulating valve are respectively used for controlling the mass of the hydrogen and the carbon dioxide entering the mixing unit; the compression unit is used for compressing the mixed gas in the mixing unit and then conveying the compressed mixed gas to the reaction unit to react to generate methanol, and the separation unit is used for separating and purifying the methanol generated in the reaction unit.
Preferably, a power generation unit is connected to the hydrogen production unit, and the power generation unit is used for supplying power to the hydrogen production unit.
Preferably, the power generation unit includes a wind power device and a photovoltaic power device.
Preferably, the hydrogen production unit comprises a plurality of proton membrane electrolytic hydrogen production devices or a plurality of alkaline electrolytic water hydrogen production devices.
Preferably, the carbon dioxide capturing unit comprises a plurality of collecting subunits, and the collecting subunits comprise carbon capturing units and carbon dioxide direct air capturing units which are distributed in power plants and chemical plants.
Preferably, a first feedback loop is arranged between the carbon dioxide regulating valve and the carbon dioxide mass flowmeter, and the carbon dioxide regulating valve regulates the opening of the valve body according to the carbon dioxide mass flowing in unit time measured by the carbon dioxide mass flowmeter; and a second feedback loop is arranged between the hydrogen regulating valve and the hydrogen mass flowmeter, and the opening of the valve body is regulated by the hydrogen regulating valve according to the hydrogen mass flowing in unit time measured by the hydrogen mass flowmeter.
Preferably, the mass ratio of the carbon dioxide to the hydrogen in the mixing unit is 7.0-7.8:1.
Preferably, the mixing unit comprises a premixing storage tank and a pressure monitoring unit, wherein the pressure monitoring unit is used for monitoring the pressure in the premixing storage tank and controlling the carbon dioxide regulating valve, the hydrogen regulating valve and the compression unit in a feedback mode so as to adjust the pressure in the premixing storage tank to be between 0.8Mpa and 1.6 Mpa.
Preferably, the compression unit comprises a high-capacity compressor connected with the pre-mixing storage tank, the high-capacity compressor is used for compressing the mixed gas in the pre-mixing storage tank, and the pressure of the mixed gas output by the high-capacity compressor is not lower than 15Mpa.
The invention also provides a methanol synthesis method for premixing carbon dioxide and hydrogen, which comprises the following steps:
the hydrogen production unit electrolyzes water to produce hydrogen, the hydrogen is conveyed to the hydrogen storage unit through a pipeline, and meanwhile, the carbon dioxide capture unit captures and recovers carbon dioxide in tail gas of a power plant and a chemical plant and in air and conveys the carbon dioxide to the carbon dioxide storage unit;
the opening states of the carbon dioxide regulating valve and the hydrogen regulating valve are regulated, carbon dioxide and hydrogen are conveyed to the mixing unit for premixing, and the mass ratio of the carbon dioxide to the hydrogen in the mixing unit is regulated and maintained within the range of 7.0-7.8:1;
starting the compression unit to boost the mixed gas in the mixing unit within the optimal reaction efficiency mass ratio range to more than 15Mpa, conveying the mixed gas to the reaction unit to react to generate methanol, and separating and purifying the methanol by the separation unit.
Compared with the prior art, the methanol synthesis system and the method for premixing carbon dioxide and hydrogen provided by the embodiment of the invention have the beneficial effects that:
in the embodiment, a mixing unit is arranged to mix carbon dioxide and hydrogen in advance, the mixing ratio of the carbon dioxide to the hydrogen is controlled within the range of the optimal reaction efficiency mass ratio, then the mixed gas is pressurized and is input into a reaction unit to react to generate methanol, and the carbon dioxide and the hydrogen are mixed in advance to ensure that the carbon dioxide and the hydrogen are always within the range of the optimal reaction efficiency mass ratio, so that the generation efficiency of the methanol in the reaction unit and the utilization efficiency of the carbon dioxide and the hydrogen can be improved, and the problem of the subsequent frequent allocation of the gas mass ratio in the reaction unit is avoided;
further, compared with the compression process of high-purity hydrogen, the mixed gas of carbon dioxide and hydrogen is easier to compress in large quantities, and the compression efficiency and the conveying efficiency are higher.
Drawings
FIG. 1 is a schematic diagram of a system of the present invention;
FIG. 2 is another system schematic of the present invention;
FIG. 3 is a method step diagram of the present invention;
FIG. 4 is a schematic representation of methanol production at different mass ratios of carbon dioxide to hydrogen in accordance with the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, a preferred embodiment of the present invention provides a methanol synthesis system and method for premixing carbon dioxide and hydrogen, comprising: a hydrogen production unit, a carbon dioxide capturing unit and a mixing unit;
the output end of the hydrogen production unit is sequentially connected with a hydrogen storage unit, a hydrogen regulating valve and a hydrogen mass flowmeter; the output end of the carbon dioxide capturing unit is sequentially connected with a carbon dioxide storage unit, a carbon dioxide regulating valve and a carbon dioxide mass flowmeter;
the mixing unit is connected with the output end of the hydrogen mass flowmeter and the carbon dioxide mass flowmeter, the output end of the mixing unit is sequentially connected with the compression unit, the reaction unit and the separation unit, and the mixing unit is used for premixing carbon dioxide and hydrogen and storing mixed gas after mixing;
the hydrogen mass flowmeter and the carbon dioxide mass flowmeter are respectively used for monitoring the mass of the hydrogen and the carbon dioxide entering the mixing unit, and the carbon dioxide regulating valve and the hydrogen regulating valve are respectively used for controlling the mass of the hydrogen and the carbon dioxide entering the mixing unit; the compression unit is used for compressing the mixed gas in the mixing unit and then conveying the compressed mixed gas to the reaction unit to react to generate methanol, and the separation unit is used for separating and purifying the methanol generated in the reaction unit.
The hydrogen production unit is connected with the hydrogen storage unit, the hydrogen regulating valve and the hydrogen mass flowmeter through pipeline valves, the carbon dioxide capturing unit is connected with the carbon dioxide storage unit, the carbon dioxide regulating valve and the carbon dioxide mass flowmeter through pipelines, hydrogen and carbon dioxide flow in the pipelines through pressure, the hydrogen mass flowmeter can monitor the mass of hydrogen flowing in unit time, and the carbon dioxide mass flowmeter can monitor the mass of carbon dioxide flowing in unit time, so that the mass ratio of the carbon dioxide to the hydrogen can be controlled later.
In the traditional process, carbon dioxide and hydrogen are respectively introduced into a reaction unit for reaction, the mixing unit can be used for mixing the hydrogen and the carbon dioxide in advance according to the optimal reaction ratio, and then the mixed gas is pressurized and introduced into the reaction unit, so that the mass ratio of the carbon dioxide and the hydrogen in the reaction unit can be always kept within the range of the optimal reaction efficiency mass ratio, the reaction generation efficiency of methanol is improved, the application of a large number of small-capacity compressors is avoided, the compression difficulty and the compression danger are reduced due to the mixing of the gas, a large number of mixed gas can be continuously input into the reaction unit for reaction by adopting the large-capacity compressors, the systematic risk brought by the large number of small-capacity compressors and the complexity qualified instability of the system are avoided, the allocation and the transportation of the hydrogen and the carbon dioxide are simpler and safer, the system structure is simpler, and the stability is better.
In some embodiments, the hydrogen production unit is connected to a power generation unit for powering the hydrogen production unit. In yet other embodiments, the power generation unit may also power the carbon dioxide capture unit as well as the reaction unit.
In some embodiments, the power generation unit includes clean energy sources such as wind power devices and photovoltaic power devices, and when the system is arranged near the sea, green energy sources such as offshore photovoltaic, offshore wind energy and tidal energy can be also adopted, and when the system is arranged near the power plant, the electric energy and the heat energy output by the power plant can be directly used.
In some embodiments, the hydrogen production unit comprises a plurality of proton membrane electrolytic hydrogen production devices or a plurality of alkaline electrolytic water hydrogen production devices; specifically, the hydrogen production device can be used in combination with a plurality of proton membrane electrolytic hydrogen production devices, can be used in combination with a plurality of alkaline electrolytic water hydrogen production devices, and can be arranged in combination according to actual application scenes and requirements.
In some embodiments, the carbon dioxide capture unit comprises a plurality of acquisition subunits, wherein the acquisition subunits comprise carbon capture units and carbon dioxide direct air capture units which are distributed in power plants and chemical plants; specifically, the carbon dioxide capturing unit captures and acquires carbon dioxide mainly through two ways, on one hand, a CCS technology (carbon dioxide capturing and sealing technology) is adopted, the technology is mainly arranged in places such as a power plant and a chemical plant where a large amount of carbon dioxide waste gas is easily generated, and the technology is used for capturing and recycling a large amount of carbon dioxide generated in the production of the carbon capturing unit and is matched with hydrogen production units arranged around the power plant and the chemical plant to realize recycling of the carbon dioxide to prepare methanol; on the other hand, the DAC technology (carbon dioxide direct air trapping technology) is adopted, carbon dioxide in air can be directly trapped by the technology, the content of the carbon dioxide in the air is reduced, hydrogen can be generated by driving the hydrogen production unit through the green energy and the carbon dioxide direct air trapping unit is driven to obtain the carbon dioxide in places with rich water resources, further continuous preparation of methanol is realized, and in other embodiments, the carbon trapping unit and the carbon dioxide direct air trapping unit can be combined to improve the trapping efficiency of the carbon dioxide.
In some embodiments, a first feedback loop is arranged between the carbon dioxide regulating valve and the carbon dioxide mass flowmeter, and the carbon dioxide regulating valve regulates the opening of the valve body according to the carbon dioxide mass flowing in unit time measured by the carbon dioxide mass flowmeter; the second feedback loop is arranged between the hydrogen regulating valve and the hydrogen mass flowmeter, the opening of the valve body is adjusted according to the hydrogen mass flowing through the hydrogen mass flowmeter in unit time, specifically, in the actual regulation process, the mass of hydrogen passing through the hydrogen mass flowmeter in unit time and the mass of carbon dioxide passing through the carbon dioxide mass flowmeter in unit time can be counted manually, the opening states of the carbon dioxide regulating valve and the hydrogen regulating valve are controlled manually, in other embodiments, the chip module can be set to continuously count and monitor the data of the hydrogen mass flowmeter and the carbon dioxide mass flowmeter, the opening and closing states of the carbon dioxide regulating valve and the hydrogen regulating valve are controlled through the first feedback loop and the second feedback loop, and then the mass ratio of carbon dioxide and hydrogen in the mixing unit is controlled within the range of the optimal reaction efficiency mass ratio.
Referring to FIG. 4, in some embodiments, the mass ratio of carbon dioxide to hydrogen in the mixing unit is controlled to be 7.0-7.8:1; specifically, the chemical formula of the methanol generated by the hydrogenation of carbon dioxide is as follows:
3H 2 +CO 2 ＝CH 3 OH+H 2 O；
the molar mass of the hydrogen is 2 g/mol l, the molar mass of the carbon dioxide is 44 g/mol l, the mass ratio of the carbon dioxide to the optimal reaction efficiency of the hydrogen to the methanol is 7.33:1 according to a reaction formula and the molar number, and in the actual production process, the mass ratio of the carbon dioxide to the hydrogen is controlled within the range of 7.0-7.8:1, when the mass ratio is lower than 7.0:1, the reaction efficiency is insufficient due to the reduction of the content of the carbon dioxide, meanwhile, the hydrogen can be used as an active gas to have adverse effect on the catalyst, and when the mass ratio is higher than 7.8, the carbon dioxide can be used as an inert gas to influence the normal operation of the reaction, so that the production efficiency of the methanol is reduced.
In some embodiments, the mixing unit comprises a pre-mix tank and a pressure monitoring unit to monitor the pressure in the pre-mix tank and feedback control the carbon dioxide regulator valve, the hydrogen regulator valve, and the compression unit to adjust the pressure in the pre-mix tank between 0.8Mpa and 1.6 Mpa. Specifically, in the actual production process, the pressures of the hydrogen output by the proton membrane electrolysis hydrogen production and the alkaline electrolysis water hydrogen production in the hydrogen production unit are generally 1.6Mpa, so that the pressures of the pre-mixing storage tank and the hydrogen storage unit are set to be not higher than 1.6Mpa, so that the hydrogen generated by the hydrogen production unit can smoothly enter the pre-mixing storage tank through the hydrogen regulating valve under the action of pressure, and the pressure in the pre-mixing storage tank is higher than 0.8Mpa, so that the reduction of the production efficiency of methanol caused by the reduction of the amount of mixed gas output by the pressurizing of the compressing unit due to the too low pressure in the pre-mixing storage tank is avoided, and the unnecessary increase of the compression power of the compressing unit is also avoided.
In some embodiments, the compression unit comprises a high-capacity compressor connected with the premixing storage tank, the high-capacity compressor is used for compressing the mixed gas in the premixing storage tank, and the pressure of the mixed gas output by the high-capacity compressor is not lower than 15Mpa; wherein 15Mpa is the pressure condition required for preparing methanol.
As shown in fig. 3, the present invention further provides a methanol synthesis method for premixing carbon dioxide and hydrogen, comprising the steps of:
the hydrogen production unit electrolyzes water to produce hydrogen, the hydrogen is conveyed to the hydrogen storage unit through a pipeline, and meanwhile, the carbon dioxide capture unit captures and recovers carbon dioxide in tail gas of a power plant and a chemical plant and in air and conveys the carbon dioxide to the carbon dioxide storage unit; the hydrogen production units and the carbon dioxide capturing units can both adopt green energy sources to reduce energy consumption and realize recycling of carbon dioxide, the hydrogen production units can be installed nearby to reduce transportation and compression cost of hydrogen, and the carbon dioxide capturing units can be installed in places such as power plants and chemical plants where a large amount of carbon dioxide waste gas is easily generated to recycle a large amount of carbon dioxide.
The opening states of the carbon dioxide regulating valve and the hydrogen regulating valve are regulated, carbon dioxide and hydrogen are conveyed to the mixing unit for premixing, and the mass ratio of the carbon dioxide to the hydrogen in the mixing unit is regulated and maintained within the range of 7.0-7.8:1; the regulating work of the carbon dioxide regulating valve and the hydrogen regulating valve can be manual regulation, and a monitoring chip can be arranged to monitor data of the carbon dioxide mass flowmeter and the hydrogen mass flowmeter, so that the opening and closing states of the carbon dioxide regulating valve and the hydrogen regulating valve are controlled.
Starting the compression unit to boost the mixed gas in the mixing unit within the optimal reaction efficiency mass ratio range to more than 15Mpa, conveying the mixed gas to the reaction unit to react to generate methanol, and separating and purifying the methanol by the separation unit.
In summary, the working principle of the invention is as follows: the wind power device and the photovoltaic power generation device in the power generation unit provide green energy for the hydrogen production unit to electrolyze water to produce hydrogen, and the power generation unit can also provide green energy for the carbon dioxide capture unit and the reaction unit under the condition of surplus energy, so that the energy consumption of the whole system is further reduced; the hydrogen production unit can be combined with a plurality of water electrolysis devices to produce a large amount of hydrogen for reaction, the carbon dioxide trapping unit can be combined with a plurality of collecting subunits, the carbon dioxide in the waste gas of a power plant and a chemical plant can be recovered in a targeted manner, the carbon dioxide is continuously obtained from the air by the direct air trapping unit, the air pollution is reduced, the carbon dioxide content in the air is reduced, and the greenhouse effect is reduced; the hydrogen produced by the hydrogen production unit is concentrated in the hydrogen storage unit, then the hydrogen in the hydrogen storage unit enters the mixing unit through the hydrogen regulating valve and the hydrogen mass flowmeter to participate in mixing, the carbon dioxide trapped by the carbon dioxide trapping unit is concentrated in the carbon dioxide storage unit, then the carbon dioxide in the carbon dioxide storage unit enters the mixing unit through the carbon dioxide regulating valve and the carbon dioxide mass flowmeter to participate in mixing, in the mixing process of the hydrogen and the carbon dioxide, the quality of the mixed hydrogen and the quality of the carbon dioxide are monitored in unit time through the hydrogen mass flowmeter and the carbon dioxide mass flowmeter respectively, the opening states of the hydrogen regulating valve and the carbon dioxide regulating valve are controlled respectively to keep the quality ratio of the carbon dioxide and the hydrogen in the mixing unit within the range of the optimal reaction efficiency mass ratio, the compression unit pressurizes the mixed gas in the optimal reaction efficiency mass ratio in the mixing unit and then transmits the mixed gas to the reaction unit to react to generate methanol, and the separation unit separates and purifies the generated methanol.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.

Claims (10)

1. A methanol synthesis system for premixing carbon dioxide with hydrogen, comprising:
the output end of the hydrogen production unit is sequentially connected with a hydrogen storage unit, a hydrogen regulating valve and a hydrogen mass flowmeter;
the output end of the carbon dioxide capturing unit is sequentially connected with a carbon dioxide storage unit, a carbon dioxide regulating valve and a carbon dioxide mass flowmeter;
the mixing unit is connected with the output end of the hydrogen mass flowmeter and the carbon dioxide mass flowmeter, the output end of the mixing unit is sequentially connected with the compression unit, the reaction unit and the separation unit, and the mixing unit is used for premixing carbon dioxide and hydrogen and storing mixed gas after mixing;
the hydrogen mass flowmeter and the carbon dioxide mass flowmeter are respectively used for monitoring the amounts of hydrogen and carbon dioxide entering the mixing unit, and the carbon dioxide regulating valve and the hydrogen regulating valve are respectively used for controlling the amounts of hydrogen and carbon dioxide entering the mixing unit; the compression unit is used for compressing the mixed gas in the mixing unit and then conveying the compressed mixed gas to the reaction unit to react to generate methanol, and the separation unit is used for separating and purifying the methanol generated in the reaction unit.
2. The methanol synthesis system for premixing carbon dioxide and hydrogen as recited in claim 1, wherein a power generation unit is connected to the hydrogen generation unit, the power generation unit being configured to power the hydrogen generation unit.
3. The methanol synthesis system of premixing carbon dioxide and hydrogen gas as in claim 2, wherein the power generation unit comprises a wind power plant and a photovoltaic power plant.
4. The methanol synthesis system of premixing carbon dioxide and hydrogen as in claim 1, wherein the hydrogen production unit comprises a plurality of proton membrane electrolytic hydrogen production devices or a plurality of alkaline electrolytic water hydrogen production devices.
5. The methanol synthesis system of claim 1, wherein the carbon dioxide capture unit comprises a plurality of capture subunits, the capture subunits comprising carbon capture units and carbon dioxide direct air capture units distributed throughout power plants and chemical plants.
6. The methanol synthesis system for premixing carbon dioxide and hydrogen according to claim 1, wherein a feedback loop is provided between the carbon dioxide regulating valve and the carbon dioxide mass flowmeter, and the carbon dioxide regulating valve adjusts the opening of the valve body according to the carbon dioxide mass flowing in unit time measured by the carbon dioxide mass flowmeter; and a feedback loop is arranged between the hydrogen regulating valve and the hydrogen mass flowmeter, and the opening of the valve body is regulated by the hydrogen regulating valve according to the hydrogen mass flowing in unit time measured by the hydrogen mass flowmeter.
7. The methanol synthesis system of premixing carbon dioxide and hydrogen as recited in claim 6, wherein a mass ratio of the carbon dioxide to the hydrogen in the mixing unit is 7.0-7.8:1.
8. The methanol synthesis system for premixing carbon dioxide and hydrogen as recited in claim 1, wherein the mixing unit comprises a premixing tank and a pressure monitoring unit for monitoring the pressure in the premixing tank and feedback controlling the carbon dioxide regulating valve, the hydrogen regulating valve and the compression unit to adjust the pressure in the premixing tank between 0.8Mpa and 1.6 Mpa.
9. The methanol synthesis system for premixing carbon dioxide and hydrogen as recited in claim 8, wherein said compression unit includes a high capacity compressor connected to said premixing tank, said high capacity compressor being for compressing a mixed gas in said premixing tank, and a pressure of the mixed gas outputted from said high capacity compressor is not lower than 15Mpa.
10. A methanol synthesis method for premixing carbon dioxide and hydrogen, comprising the steps of:
the hydrogen production unit electrolyzes water to produce hydrogen, the hydrogen is conveyed to the hydrogen storage unit through a pipeline, and meanwhile, the carbon dioxide capture unit captures and recovers carbon dioxide in tail gas of a power plant and a chemical plant and in air and conveys the carbon dioxide to the carbon dioxide storage unit;
the opening states of the carbon dioxide regulating valve and the hydrogen regulating valve are regulated, carbon dioxide and hydrogen are conveyed to the mixing unit for premixing, and the mass ratio of the carbon dioxide to the hydrogen in the mixing unit is regulated and maintained within the range of 7.0-7.8:1;
starting the compression unit to boost the mixed gas in the mixing unit within the optimal reaction efficiency mass ratio range to more than 15Mpa, conveying the mixed gas to the reaction unit to react to generate methanol, and separating and purifying the methanol by the separation unit.
CN202311520982.2A 2023-11-14 2023-11-14 Methanol synthesis system and method for premixing carbon dioxide and hydrogen Pending CN117599694A (en)

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