CN115784235A - Smelting method and smelting system of industrial silicon - Google Patents
Smelting method and smelting system of industrial silicon Download PDFInfo
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Abstract
The invention discloses a smelting method and a smelting system of industrial silicon, which comprise the following steps: reacting a hydrocarbon with a SiO-containing gas 2 The granular raw materials are fully mixed in a reactor, hydrocarbon cracking reaction of hydrocarbon occurs after heating, and the cracking products of the hydrocarbon cracking reaction and the SiO-containing materials 2 Carbothermic reduction of the feedstock of the particles; the heating temperature is not lower than 1700 ℃. The industrial silicon smelting method can realize zero carbon emission, is suitable for outer space smelting, and can reduce the subsequent purification difficulty, and the purity of the prepared industrial silicon is high.
Description
Technical Field
The invention relates to a smelting method and a smelting system of industrial silicon.
Background
Silicon is an important raw material widely applied to semiconductor, new energy, metallurgy, chemical industry and other key industries. China is the biggest producing country and consuming country of the global silicon industry, the yield accounts for more than seven percent of the world, and the consumption amountAccount for more than half of the world and grow year by year. The preparation of industrial silicon mainly uses silicon ore as raw material and carbon as reducing agent, and smelting is carried out in ore-smelting furnace by electrode heating. The main cost is composed of raw materials, auxiliary materials and electric energy. The main reactions employed in the prior art are carbothermic reduction: 2C SiO 2 ＝Si+2CO。
Due to SiO 2 Stable in nature, CO, H 2 Reducing agents can not be reduced, at present, solid carbon reducing agents which are easy to bring impurities are mainly adopted, such as coal, biomass, petroleum coke and the like, and the generated CO can not reduce SiO 2 The reaction efficiency is low.
Although the silicon smelting scale in China is huge, some problems still exist to restrict the development of the industry, and the method mainly comprises the following aspects: (1) Depending on a carbon reducing agent, the existing silicon smelting reducing agent mainly comprises charcoal, petroleum coke and coal, and has the problems of environmental destruction, carbon emission and the like, and the production process is difficult to realize green low carbon; (2) The quality of the produced industrial silicon is not high due to the introduction of impurities into the reducing agent; (3) The prior art adopts high-temperature carbothermic reduction to produce crude silicon, and then carries out purification, and has long process flow and large energy consumption.
The existing silicon smelting patents mainly focus on the related improvement of submerged arc furnace smelting, in particular to the modification and innovation of carbon reducing agents, such as CN 1876567A, CN 102442671A, CN 109279609B, CN 110342523A, CN102381708B and the like. The defect of introducing impurities into the carbon reducing agent is not fundamentally solved, and simultaneously, carbothermic reduction generates a large amount of reducing gas, and finally carbon dioxide is formed to be discharged. Other patents propose new devices for industrial silicon smelting, such as CN 110371983A, CN 207061882, CN 215823611U and the like, but the device does not change the carbon thermal reduction nature, but changes the heating mode, furnace lining and the like to reduce the introduction of impurities.
In order to solve the above problems, the realization of efficient low-carbon smelting of silicon has become one of the key technical problems restricting the development of the semiconductor industry. Meanwhile, silicon is used as the most main energy material and semiconductor base stone and is an important strategic resource for building outer space bases in China. The earth surface is launched by spaceflight, and large-scale transportation cost is high, efficiency is low, and risk is high. The prior art needs a large amount of reducing agents, and cannot solve the problem of large-scale preparation under the severe outer space condition.
Disclosure of Invention
The invention aims to solve the problems that the quality of industrial silicon produced in the prior art is not high, green and low carbon are difficult to realize in the production process, the production energy consumption is large, large-scale preparation under the harsh outer space condition cannot be realized, and the like, so that the invention provides a smelting method and a smelting system for industrial silicon.
The invention mainly adopts the following technical scheme to solve the technical problems:
the invention provides a smelting method of industrial silicon, which is characterized by comprising the following steps: reacting a hydrocarbon with a SiO-containing gas 2 The granular raw materials are fully mixed in a reactor, hydrocarbon cracking reaction of hydrocarbon occurs after heating, and the cracking products of the hydrocarbon cracking reaction and the SiO-containing materials 2 Carbothermic reduction of the feedstock of the particles; the heating temperature is not lower than 1700 ℃.
In the present invention, the molecular formula of the hydrocarbon is C x H y Preferably one or more of alkanes, cycloalkanes, alkenes, alkynes and aromatics.
Among them, the alkane is preferably an alkane having 1 to 10 carbon atoms, more preferably an alkane having 1 to 5 carbon atoms, such as methane or ethane.
Wherein, when the alkane is methane, the purity of the methane is preferably 99.999%.
Among them, the olefin is preferably an olefin having 2 to 10 carbon atoms, more preferably an olefin having 2 to 5 carbon atoms, such as ethylene or propylene.
Wherein, when the olefin is ethylene, the purity of the ethylene is preferably 99.99%.
In the present invention, the SiO-containing layer 2 The raw material of the particles is SiO 2 Quartz sand with a purity of more than 99%, for exampleSuch as SiO 2 Quartz sand with purity higher than 99.5%.
In the present invention, the mass of the hydrocarbon and the SiO-containing 2 The mass of the raw material of the particles is preferably ((12x + y)/30 x): 1.
wherein if the mass of the hydrocarbon is SiO 2 The mass ratio of the raw materials of the particles is higher than ((12x + y)/30 x): 1, the cracking products of the hydrocarbon can be underutilized; if the mass of said hydrocarbon compound is SiO-containing 2 The mass ratio of the raw materials of the particles is lower than ((12x + y)/30 x): 1, the carbothermic reduction reaction is insufficient, and the prepared industrial silicon has low purity and low yield.
In the present invention, the reactor is preferably a fixed bed, a fluidized bed or an entrained flow bed.
In the present invention, the residence time of the hydrocarbon in the reactor is preferably 2 to 5 hours, for example 3 hours.
Wherein the residence time represents the time from the time of introducing the hydrocarbon into the reactor to the time of discharging the gas out of the reactor after the reaction is finished.
In the present invention, the heating method is preferably high-temperature gas heating, external microwave heating or electromagnetic heating.
In the present invention, the heating temperature is preferably 1750 to 2000 ℃, for example, 1800 ℃.
In the invention, the hydrocarbon cracking reaction is as follows: 2C x H y ＝2xC+yH 2 The carbothermic reduction reaction is as follows: 2xC + xSiO 2 ＝xSi+2xCO。
In the present invention, the hydrocarbon cracking and the carbothermic reduction are carried out simultaneously in the reactor.
In the present invention, preferably, the method for smelting industrial silicon further comprises a hydrocarbon synthesis step: h is to be 2 Introducing the mixture into a reactor in the hydrocarbon synthesis step to react with CO/H generated by the hydrocarbon cracking and the carbothermic reduction 2 And mixing the synthesis gas to obtain a mixed gas, heating the mixed gas to perform hydrocarbon synthesis reaction, and preparing the hydrocarbon.
Wherein the hydrogen-carbon ratio of the mixed gas is preferably 1:1 to 4:1, for example 2:1 or 3:1.
wherein the temperature of the heating in the hydrocarbon synthesis step is preferably 300 to 500 ℃, for example, 350 ℃.
Wherein the hydrocarbon synthesis step comprises the following reaction steps: 2xCO + (y +2 x) H 2 ＝2C x H y +2xH 2 O。
Wherein, the hydrocarbon synthesis step preferably further comprises a heat transfer device.
In the invention, preferably, the smelting method of the industrial silicon further comprises the step of hydrogen production by electrolysis: and electrolyzing the water in the product of the hydrocarbon synthesis step to generate hydrogen through electrolysis to obtain the product hydrogen.
Wherein, the device for electrolysis is conventional in the field, and is preferably a device for producing hydrogen by electrolyzing water by using a proton exchange membrane.
Wherein, the electrolyzed electric energy can adopt new energy sources such as solar energy, wind energy, water energy or geothermal energy.
Wherein the electrolytic hydrogen production reaction comprises the following steps: 2xH 2 O＝2xH 2 +xO 2 。
In the present invention, preferably, H in the hydrocarbon synthesis step 2 The source is the product hydrogen of the electrolytic hydrogen production step.
The invention also provides a smelting system of the industrial silicon, which comprises a hydrocarbon cracking and carbon thermal reduction module, a hydrocarbon synthesis module and a water electrolysis hydrogen production module; the hydrocarbon synthesis module is used for transmitting hydrocarbon to the hydrocarbon cracking and carbon thermal reduction module and transmitting steam to the water electrolysis hydrogen production module, and the water electrolysis hydrogen production module is used for transmitting H to the hydrocarbon synthesis module 2 。
The equipment used in the hydrocarbon cracking and carbothermic module may comprise equipment conventional in the art, preferably a fixed bed, a fluidized bed or an entrained flow bed.
The equipment used in the hydrocarbon synthesis module may comprise equipment conventional in the art, preferably a fixed bed, a fluidized bed or a slurry bed.
The equipment used by the water electrolysis hydrogen production module can comprise equipment conventional in the field, and preferably proton exchange membrane water electrolysis hydrogen production equipment.
In the present invention, preferably, a heat transfer device is further included in the hydrocarbon synthesis module.
In the present invention, preferably, the hydrocarbon cracking and carbon thermal reduction module, the hydrocarbon synthesis module, and the water electrolysis hydrogen production module are connected in sequence.
In the present invention, preferably, the hydrocarbon cracking and carbothermic module is provided with a first pipeline connected with the hydrocarbon synthesis module for transmitting CO and H to the hydrocarbon synthesis module 2 。
In the present invention, preferably, the hydrocarbon synthesis module is provided with a second pipeline connected to the hydrocarbon cracking and carbothermic module, and configured to transmit hydrocarbons to the hydrocarbon cracking and carbothermic module.
In the present invention, preferably, the hydrocarbon synthesis module is provided with a third pipeline connected to the water electrolysis hydrogen production module, and is configured to transmit water vapor to the water electrolysis hydrogen production module.
In the present invention, preferably, the water electrolysis hydrogen production module is provided with a fourth pipeline connected with the hydrocarbon synthesis module for transmitting H to the hydrocarbon synthesis module 2 。
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The reagents and starting materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows:
1. the invention combines the hydrocarbon and SiO under high temperature condition 2 The particles are fully mixed in the reactor, and the coupling of hydrocarbon cracking reaction and carbon thermal reduction reaction can reduce the number of the reactors, simplify the flow and reduce the cost. Deposition of carbon black with micro-nano scale on SiO generated by hydrocarbon cracking 2 The particle surface is easy to form high-efficiency contact between the particle surface and the particle surface, the reaction efficiency is improved, the reduction reaction is strengthened, and the realization of the reduction reactionAnd (4) efficiently smelting silicon. The purity of the industrial silicon prepared by the invention is as high as 99.5%.
2. By the preferred scheme, the cyclic utilization of the hydrocarbon elements is realized by coupling the four chemical reactions of hydrocarbon cracking, carbothermic reduction, hydrocarbon synthesis and electrolytic hydrogen production, and the electric energy used by the whole process is new energy, so that the full-link low-carbon smelting can be realized. The preferable scheme has the characteristics of pure electric power consumption, zero carbon emission, high product purity and byproduct pure oxygen, is particularly suitable for outer space smelting, and meets the silicon requirement of an extra-terrestrial space base.
Drawings
FIG. 1 is a process flow diagram of examples 2 and 3 of the present invention.
FIG. 2 is SiO in example 1 2 SEM and EDS images of the feedstock and SiO deposited with carbon black but not yet carbothermally reduced 2 SEM picture and EDS picture of (a).
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example 1
With SiO 2 Filling sand with purity higher than 99% as raw material in a fixed bed at a dosage of 1t/h, selecting methane (with purity higher than 99.999%) as hydrocarbon at a dosage of 530kg/h, heating methane to 900 deg.C by high-temperature gas, introducing into the fixed bed from bottom to top, collecting prepared SiO deposited with carbon black but not subjected to carbothermic reduction reaction from bottom of the fixed bed 2 . Then the temperature of the gas is raised to 1700 ℃ and the gas is continuously led into the fixed bed to stay for 3 hours, and CO (742 Nm & lt/EN & gt) is generated 3 H) with H produced by cracking 2 (1484Nm 3 H) are mixed to produce synthesis gas and leave the fixed bed at the top. And collecting the prepared industrial silicon from the bottom of the fixed bed.
Example 2
Smelting system package of industrial silicon adopted in the embodimentThe system comprises a hydrocarbon cracking and carbon thermal reduction module, a hydrocarbon synthesis module and a water electrolysis hydrogen production module; the hydrocarbon synthesis module is used for transmitting hydrocarbon to the hydrocarbon cracking and carbon thermal reduction module and transmitting steam to the water electrolysis hydrogen production module, and the water electrolysis hydrogen production module is used for transmitting H to the hydrocarbon synthesis module 2 The smelting system is shown in figure 1. The specific smelting method comprises the following steps:
s1: with SiO 2 The sandstone with the purity higher than 99 percent is used as a raw material and filled in a fixed bed, the dosage is 1t/h, the hydrocarbon is selected from methane (with the purity higher than 99.999 percent) as the raw material, the dosage is 530kg/h, and the sandstone is quickly introduced into the fixed bed from bottom to top and stays for 3h after the methane is heated to 1800 ℃ by adopting a high-temperature gas heating mode. CO produced (742 Nm) 3 H) with H produced by cracking 2 (1484Nm 3 H) are mixed to produce synthesis gas and leave the fixed bed at the top. And collecting the prepared industrial silicon from the bottom of the fixed bed.
S2: h is to be 2 (742Nm 3 H) introduction into the reactor with CO/H 2 And mixing the synthesis gas to obtain mixed gas, wherein the hydrogen-carbon ratio of the mixed gas is 3:1, the temperature of the hydrocarbon synthesis reaction is 350 ℃, and a heat transfer device is arranged to release heat in the recovery process, so that methane and water are generated.
S3: electrolyzing the water generated in the S2 to generate pure oxygen and hydrogen, using the generated hydrogen in the S2 to improve the hydrogen-carbon ratio, and adopting solar energy as electric energy.
Example 3
The smelting system of the industrial silicon adopted by the embodiment comprises a hydrocarbon cracking and carbon thermal reduction module, a hydrocarbon synthesis module and a water electrolysis hydrogen production module; the hydrocarbon synthesis module is used for transmitting hydrocarbon to the hydrocarbon cracking and carbon thermal reduction module and transmitting steam to the water electrolysis hydrogen production module, and the water electrolysis hydrogen production module is used for transmitting H to the hydrocarbon synthesis module 2 The smelting system is shown in figure 1. The specific smelting method comprises the following steps:
s1: with SiO 2 Filling sandstone with purity higher than 99% as raw material in fixed bed at a dosage of 1t/h, selecting ethylene (with purity higher than 99.99%) as hydrocarbon at a dosage of 463kg/h, and using high temperature gasThe heating mode is that after the ethylene is heated to 2000 ℃ at high temperature, the ethylene is rapidly introduced into the fixed bed from bottom to top and stays for 3 hours. CO produced (742 Nm) 3 H) with H produced by cracking 2 (742Nm 3 H) are mixed to produce synthesis gas and leave the fixed bed at the top. And collecting the prepared industrial silicon from the bottom of the fixed bed.
S2: will H 2 (742Nm 3 H) introduction into the reactor with CO/H 2 And mixing the synthesis gas to obtain mixed gas, wherein the hydrogen-carbon ratio of the mixed gas is 2:1, the hydrocarbon synthesis reaction temperature is 350 ℃, and a heat transfer device is arranged to release heat in the recovery process, so that ethylene and water are generated.
S3: electrolyzing the water generated in the S2 to generate pure oxygen and hydrogen, using the generated hydrogen in the S2 to improve the hydrogen-carbon ratio, and adopting wind energy as electric energy.
Comparative example 1
S1: mixing natural gas as raw material gas with a certain proportion of air, entering a reaction furnace at 1250-1350 ℃ for partial combustion reaction and cracking to prepare carbon black, and cooling to obtain the carbon black with the particle size of 80-130 nm.
S2: with SiO 2 The sandstone with the purity higher than 99 percent is used as a raw material, the dosage is 1t/h, the pure carbon black obtained in the S1 is selected, the dosage is 396kg/h, the pure carbon black is fully mixed with the sandstone in a submerged arc furnace, and the silicon dioxide particles and the carbon black are heated by the carbon electrode in a conductive manner.
S3: and collecting and obtaining the prepared industrial silicon from the bottom of the submerged arc furnace.
Comparative example 2
S1: with SiO 2 The sandstone with the purity higher than 99 percent is taken as a raw material, and the dosage is 1t/h. Petroleum coke, bituminous coal and charcoal are selected as a mixed carbonaceous reducing agent, wherein the volatile content of the petroleum coke is 13%, the ash content is 0.5%, the volatile content of the bituminous coal is 30%, the ash content is 7%, the charcoal content is 27%, and the ash content is 2%, and the mass ratio of the petroleum coke to the bituminous coal is 1:1:1. the dosage of the mixed carbonaceous reducing agent is 539kg/h. Uniformly mixing the mixed carbonaceous reducing agent and the sandstone, and burying the mixture into a submerged arc furnace;
s2: electrifying the bed layer to 1800 ℃ by using a carbon electrode, and performing waste heat recovery and flue gas combustion after reaction;
s3: and collecting liquid silicon at the bottom of the submerged arc furnace, and carrying out primary oxygen blowing to obtain the industrial silicon.
Effect example 1
For SiO of example 1 2 Raw material and SiO after contacting with methane at 900 ℃ for 30min 2 Scanning electron microscope analysis and X-ray energy spectrum analysis are carried out. The scanning electron microscope adopts a Helios G4 UC SEM-EDS instrument, and the multiplying power is 3000 times and 1000 times respectively; the instrument used for X-ray spectroscopy was Helios G4 UC SEM-EDS, and the results are shown in FIG. 2.
The carbothermic reduction reaction does not occur at 900 ℃, and only the hydrocarbon cracking reaction occurs. As can be seen from FIG. 2, the carbon black produced by methane cracking is uniformly deposited on SiO 2 The surface of the raw material.
Effect example 2
The industrial silicon prepared by the embodiments 2 and 3 of the invention has low impurity content, no ash content and purity of 99.5 percent, and meets the standard of A-grade chemical grade silicon. Purity standards for industrial silicon are shown in table 1.
TABLE 1
Final 1t/h SiO in examples 2 and 3 2 Is completely decomposed into liquid silicon (0.47 t/h) and pure oxygen (371 Nm) 3 H), the rest of hydrocarbon substances (C, CH) 4 、CO、H 2 And H 2 O) complete circulation can be achieved.
Comparative example 1 is a method in which carbon black having a purity equivalent to that of example 2 and example 3 of the present invention is obtained by hydrocarbon cracking reaction of hydrocarbon, and then the carbon black is uniformly mixed with a quartz sand raw material in a simple contact manner. Final 1t/h SiO 2 Is completely decomposed into liquid silicon (0.47 t/h) and CO 2 (742Nm 3 H) with a purity of 99.5 percent and meets the standard of A-grade chemical grade silicon. In contrast to examples 2 and 3 according to the present invention, the carbon black of comparative example 1 reacted with the silica sand raw material only in a simple contact manner, whereas the carbon black of examples 2 and 3 contacted and reacted with the silica sand raw material in a deposited manner. Although both methods can make SiO 2 Is completely divided intoThe purity of industrial silicon can reach 99.5 percent when the industrial silicon is decomposed into liquid silicon, but a large amount of CO is generated in the production process of the comparative example 1 2 And is difficult to realize green environmental protection.
Comparative example 2 Petroleum coke, bituminous coal, charcoal, commonly used in the prior art, were used as reducing agents, and 1t/h SiO was obtained 2 Is decomposed into liquid silicon (0.4 t/h) and simultaneously 17kg/h of slag and about 900Nm of CO-based emission flue gas are produced 3 H is the ratio of the total weight of the catalyst to the total weight of the catalyst. The obtained industrial silicon product contains partial oxides such as calcium oxide, magnesium oxide, iron oxide and the like in the mixed carbonaceous reducing agent, has the purity of 95 percent, and does not meet the standards of smelting-grade silicon and chemical-grade silicon.
Claims (10)
1. The smelting method of the industrial silicon is characterized by comprising the following steps: reacting a hydrocarbon with a SiO-containing gas 2 The granular raw materials are fully mixed in a reactor, hydrocarbon cracking reaction of hydrocarbon occurs after heating, and the cracking products of the hydrocarbon cracking reaction and the SiO-containing materials 2 Carbothermic reduction of the feedstock of the particles; the heating temperature is not lower than 1700 ℃.
2. The method for smelting industrial silicon according to claim 1, wherein the hydrocarbon compound has a molecular formula of C x H y For example, one or more of alkanes, cycloalkanes, alkenes, alkynes, and aromatics;
and/or, the SiO-containing 2 The raw material of the particles is SiO 2 Quartz sand with a purity of more than 99%, e.g. SiO 2 Quartz sand with purity higher than 99.5%;
and/or the mass of said hydrocarbon and said SiO-containing 2 The mass ratio of the raw materials of the particles is ((12x + y)/30 x): 1.
3. the method for smelting industrial silicon according to claim 2, wherein the alkane is an alkane having 1 to 10 carbon atoms, preferably an alkane having 1 to 5 carbon atoms, such as methane or ethane;
and/or the olefin is an olefin having 2 to 10 carbon atoms, preferably an olefin having 2 to 5 carbon atoms, such as ethylene or propylene.
4. The method for smelting industrial silicon according to claim 1, wherein the reactor is a fixed bed, a fluidized bed or an entrained flow bed;
and/or the residence time of the hydrocarbon in the reactor is 2 to 5 hours, such as 3 hours;
and/or the heating mode is high-temperature gas heating, external microwave heating or electromagnetic heating;
and/or the heating temperature is 1750 ℃ to 2000 ℃, for example 1800 ℃.
5. The method for smelting industrial silicon according to claim 1, further comprising a hydrocarbon synthesis step of: h is to be 2 Introducing the mixture into a reactor in the hydrocarbon synthesis step to react with CO/H generated by the hydrocarbon cracking reaction and the carbothermic reduction reaction 2 And mixing the synthesis gas to obtain a mixed gas, heating the mixed gas to perform hydrocarbon synthesis reaction, and preparing the hydrocarbon.
6. The industrial silicon smelting method according to claim 5, wherein the hydrogen-carbon ratio of the mixed gas is 1:1 to 4:1, for example 2:1 or 3:1;
and/or the temperature of the heating in the hydrocarbon synthesis step is 300 to 500 ℃, for example 350 ℃;
and/or, the hydrocarbon synthesis step also comprises a heat transfer device.
7. The method for smelting industrial silicon according to claim 6, further comprising the step of electrolytically producing hydrogen: and electrolyzing the water in the product of the hydrocarbon synthesis step to generate hydrogen through electrolysis to obtain the product hydrogen.
8. The method for smelting industrial silicon according to claim 7, wherein the electric energy for electrolysis is new energy such as solar energy, wind energy, water energy or geothermal energy;
and/or H of said hydrocarbon synthesis step 2 The source is the product hydrogen of the electrolytic hydrogen production step.
9. The smelting system of industrial silicon is characterized by comprising a hydrocarbon cracking and carbon thermal reduction module, a hydrocarbon synthesis module and a water electrolysis hydrogen production module; the hydrocarbon synthesis module is used for transmitting hydrocarbon to the hydrocarbon cracking and carbon thermal reduction module and transmitting steam to the water electrolysis hydrogen production module, and the water electrolysis hydrogen production module is used for transmitting H to the hydrocarbon synthesis module 2 。
10. The industrial silicon smelting system according to claim 9, wherein the equipment used by the hydrocarbon cracking and carbothermic module is a fixed bed, a fluidized bed or an entrained flow bed;
and/or the equipment used by the hydrocarbon synthesis module is independently a fixed bed, a fluidized bed or a slurry bed;
and/or the equipment used by the water electrolysis hydrogen production module is proton exchange membrane water electrolysis hydrogen production equipment;
and/or, a heat removal device is also included in the hydrocarbon synthesis module;
and/or the hydrocarbon cracking and carbon thermal reduction module, the hydrocarbon synthesis module and the water electrolysis hydrogen production module are sequentially connected;
and/or the hydrocarbon cracking and carbon thermal reduction module is provided with a first pipeline connected with the hydrocarbon synthesis module and used for transmitting CO and H to the hydrocarbon synthesis module 2 ；
And/or the hydrocarbon synthesis module is provided with a second pipeline connected with the hydrocarbon cracking and carbon thermal reduction module and used for transmitting hydrocarbons to the hydrocarbon cracking and carbon thermal reduction module;
and/or the hydrocarbon synthesis module is provided with a third pipeline connected with the water electrolysis hydrogen production module and used for transmitting steam to the water electrolysis hydrogen production module;
and/or the water electrolysis hydrogen production module is provided with a fourth pipeline connected with the hydrocarbon synthesis module and used for transmitting H to the hydrocarbon synthesis module 2 。
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