A method for underground storage, conversion and reuse of carbon-containing resources

Abstract

This invention belongs to the field of carbon resource utilization and carbon dioxide emission reduction, and discloses a method for underground storage, conversion and reuse of carbon resources. Taking solid carbon resources as an example, the method includes the following steps: (1) converting solid carbon resources into carbon-containing liquids; (2) detecting the polymerization characteristics and / or reaction characteristics; if the detection results do not meet the preset requirements, the carbon-containing liquids are modulated; (3) injecting the carbon-containing liquids into underground storage points located at a depth of ≥800 meters, so that the carbon-containing liquids solidify or react at the underground storage points. This invention improves the overall process design of the storage and conversion method, modulates the polymerization characteristics and / or reaction characteristics of the carbon-containing liquids using modulation, and then injects the carbon-containing liquids into underground storage points, so that the carbon-containing liquids solidify or react under the pressure conditions at the underground storage points, thereby achieving storage and conversion. This invention injects carbon resources into deep underground layers, resulting in long-term storage.

Description

Technical Field

[0001] This invention belongs to the field of carbon resource utilization and carbon dioxide emission reduction, and more specifically, relates to a method for underground storage, conversion and reuse of carbon resources. Background Technology

[0002] Biomass is a carbon-containing resource that can replace fossil fuels. Throughout its life cycle, from formation to utilization, it releases CO2 fixed through photosynthesis, resulting in a zero-carbon emission process, but it doesn't directly reduce CO2 emissions. Burying biomass residues in the soil allows biomass carbon to be preserved in the soil layer as humus for a long time. However, this carbon sequestration is relatively shallow (the average thickness of the Earth's soil layer is about 5 meters, and this type of carbon sequestration is often located 10-20 meters underground), generally using open-cut landfill. Furthermore, it typically involves burying solid waste, and the sustainability of this treatment method remains to be studied. In addition, limited land resources hinder the large-scale promotion of this technology.

[0003] my country has a large reserve of carbon-containing resources such as agricultural and forestry waste and industrial waste, but they are diverse in type and have low energy density, making them difficult to utilize on a large scale. It would be of great significance to achieve long-term storage and effective utilization of different carbon-containing resources while significantly reducing CO2 emissions. Summary of the Invention

[0004] To address the aforementioned deficiencies or improvement needs of existing technologies, the present invention aims to provide a method for underground storage, conversion, and reuse of carbon-containing resources. This method improves the overall process design of the storage and conversion process by modulating the polymerization and / or reaction characteristics of the carbon-containing liquid (during the modulation process, the polymerization and / or reaction characteristics of the carbon-containing liquid can be pre-set according to the geological characteristics of the underground storage site (and simultaneously considering the reuse target). The carbon-containing liquid is then injected into the underground storage site, causing it to solidify or react under the pressure conditions, thus achieving storage and conversion. This invention injects carbon-containing resources deep underground, resulting in long-term storage, and allows for reuse at a suitable time later, depending on the actual situation.

[0005] To achieve the above objectives, according to one aspect of the present invention, a method for underground storage and conversion of carbon-containing resources is provided, characterized in that the method is for solid carbon-containing resources and includes the following steps:

[0006] (1) Convert solid carbon-containing resources into carbon-containing liquids through pretreatment;

[0007] (2) The polymerization characteristics and / or reaction characteristics of the carbon-containing liquid are tested, wherein the polymerization characteristics are used as a basis for adjusting the curing process; and the reaction characteristics are used as a basis for adjusting the reaction process.

[0008] If the test results meet the preset requirements, the carbon-containing liquid will proceed to step (3).

[0009] If the test results do not meet the preset requirements, the carbon-containing liquid is modified by mixing different carbon-containing liquids and / or adding additives, and the modified carbon-containing liquid is used for step (3); wherein the additives are at least one of chelating agents, polymerization inhibitors, and catalysts.

[0010] (3) Injecting carbon-containing liquid into an underground storage point located at a depth of ≥800 meters underground, so that the carbon-containing liquid solidifies or reacts at the underground storage point; wherein, the injection method is either injection of carbon-containing liquid alone or injection of carbon-containing liquid and CO2 in combination; and, anti-coking measures are taken at the same time during injection.

[0011] The solidification process involves either injecting carbon-containing liquid alone or injecting carbon-containing liquid and CO2 together. During the solidification process, the carbon-containing liquid forms a carbon-containing solidified layer under the pressure conditions at the underground storage point, thereby achieving the solidification and storage of carbon-containing resources.

[0012] The reaction corresponds to a co-injection of carbon-containing liquid and CO2. During the reaction, under the pressure conditions at the underground storage point, the carbon-containing liquid and CO2 react to generate combustible gas products. Alternatively, the reaction corresponds to an injection method of carbon-containing liquid alone. During the reaction, under the pressure conditions at the underground storage point, the carbon-containing liquid itself undergoes a cracking reaction.

[0013] According to another aspect of the present invention, a method for underground storage and conversion of carbon-containing resources is provided, characterized in that the method is for liquid carbon-containing resources and includes the following steps:

[0014] (i) Using liquid carbon-containing resources as carbon-containing liquids, the polymerization characteristics and / or reaction characteristics of the carbon-containing liquids are tested, wherein the polymerization characteristics are used as a basis for adjusting the curing process; and the reaction characteristics are used as a basis for adjusting the reaction process.

[0015] If the test results meet the preset requirements, the carbon-containing liquid will proceed to step (ii).

[0016] If the test results do not meet the preset requirements, the carbon-containing liquid is modified by mixing different carbon-containing liquids and / or adding additives, and the modified carbon-containing liquid is used for step (ii); wherein the additives are at least one of chelating agents, polymerization inhibitors, and catalysts.

[0017] (ii) Injecting carbon-containing liquid into an underground storage point located at a depth of ≥800 meters underground, so that the carbon-containing liquid solidifies or reacts at the underground storage point; wherein the injection method is either injection of carbon-containing liquid alone or injection of carbon-containing liquid and CO2 together, and anti-coking measures are taken simultaneously during injection.

[0018] The solidification process involves either injecting carbon-containing liquid alone or injecting carbon-containing liquid and CO2 together. During the solidification process, the carbon-containing liquid forms a carbon-containing solidified layer under the pressure conditions at the underground storage point, thereby achieving the solidification and storage of carbon-containing resources.

[0019] The reaction corresponds to a co-injection of carbon-containing liquid and CO2. During the reaction, under the pressure conditions at the underground storage point, the carbon-containing liquid and CO2 react to generate combustible gas products. Alternatively, the reaction corresponds to an injection method of carbon-containing liquid alone. During the reaction, under the pressure conditions at the underground storage point, the carbon-containing liquid itself undergoes a cracking reaction.

[0020] As a further preferred embodiment of the present invention, in step (3) or step (ii), when the corresponding injection method for solidification is the injection of carbon-containing liquid alone, after the carbon-containing liquid is injected into the underground storage point, it first flows, spreads, and penetrates into the cracks and fissures of the rock and soil at the bottom of the storage well due to the flow characteristics of the carbon-containing liquid; then, under the pressure of the underground storage point, due to the self-polymerization characteristics of the carbon-containing liquid, it gradually polymerizes and solidifies, forming a hard and seamless carbon-containing rock and soil bed at the bottom of the storage well; the subsequently injected carbon-containing liquid continues to flow, spread, polymerize, and solidify on this carbon-containing rock and soil bed, thereby realizing the solidification and storage of carbon-containing resources;

[0021] When the corresponding grouting method for solidification is the co-grouting of carbon-containing liquid and CO2, carbon-containing liquid and CO2 are injected alternately in a cycle. CO2 is injected into the carbon-containing liquid layer that is about to solidify. By utilizing the filling and solidification effect of carbon-containing liquid on the rock and soil gaps and its self-polymerization characteristics, a grid-like closed structure of carbon-containing resource cap layer-CO2 storage layer is formed in the storage well, thereby achieving stable storage of carbon-containing liquid and CO2.

[0022] As a further preferred embodiment of the present invention, in step (3) or step (ii), the reaction is specifically a reaction between supercritical or liquid CO2 and carbon-containing liquid under underground pressure conditions.

[0023] As a further preferred embodiment of the present invention, the method further includes a subsequent reuse step, wherein the reuse after solidification is to mine the carbon-containing solidified layer to realize the reuse of carbon resources; and the reuse after reaction is to draw the combustible gas generated by the reaction out of the ground for collection to realize reuse.

[0024] As a further preferred embodiment of the present invention, in step (1), the solid carbon-containing resource is selected from biomass and carbon-containing solid non-biomass waste;

[0025] In step (i), the liquid carbon-containing resource is a liquefied product of biomass and / or carbon-containing solid non-biomass waste or a dispersion dispersed in a liquid or a CO2 liquefied product or supercritical CO2, preferably at least one of biodiesel, ethanol, edible oil, vegetable oil, vegetable oil, solution containing microorganisms or algae, dispersion of biomass particles and / or biochar particles in water or other liquids, bio-oil, bio-oil by-products, biodiesel, and biomass fermented ethanol;

[0026] The biomass includes at least one of agricultural waste, forestry residues, wood chips, sawdust, algae, straw, sugarcane bagasse, and animal manure.

[0027] The carbon-containing solid non-biomass waste includes at least one of carbon-containing solid industrial waste, carbon-containing slag, carbon-containing sludge, waste tires, or automobile shredded residue.

[0028] As a further preferred embodiment of the present invention, in step (3) or step (ii), the anti-coking measures include at least one of the following: casing circulating water cooling, phase change heat dissipation cooling and polymerization inhibitor addition, in order to avoid coking of carbon-containing liquid in the injection pipe.

[0029] As a further preferred embodiment of the present invention, in step (3) or step (ii), the underground sealing point includes at least one of the following: depleted mine, abandoned mine, natural cave, salt cavern, difficult-to-mine strata or rock and soil pores;

[0030] Furthermore, the underground sealing point is located at a depth of ≥800 meters underground and is ≥50 meters below the underground aquifer.

[0031] As a further preferred embodiment of the present invention, in step (2) or step (i), the pre-set requirements are pre-set based on the geological characteristics of the underground storage site;

[0032] Preferably, the pre-set requirements are pre-set based on the geological characteristics of the underground storage site and the reuse objectives.

[0033] As a further preferred embodiment of the present invention, in step (1), the pretreatment utilizes at least one of pyrolysis, hydrothermal liquefaction, fermentation, and liquid blending.

[0034] Compared with the prior art, the above-described technical solutions conceived in this invention can achieve the following beneficial effects:

[0035] (1) This invention utilizes the transportability and polymerization characteristics of liquid carbon resources (if the original carbon resources are solid, they can be pre-treated to convert them into carbon liquids) to inject them into the ground for storage, either alone or in combination with CO2. This avoids the disadvantages of carbon resources being diverse, having low energy density, and being difficult to utilize on a large scale. It can achieve large-scale, low-cost storage and directly reduce atmospheric carbon emissions while achieving long-term stable storage of carbon resources.

[0036] This invention presents a process for underground storage, conversion, and reuse of carbon-containing resources, enabling long-term storage and effective utilization of these resources while significantly reducing CO2 emissions. By storing carbon-containing resources underground (≥800 meters), this invention avoids the drawbacks of existing shallow landfill methods. It achieves long-term stable storage of carbon-containing resources while directly reducing atmospheric carbon emissions. The resulting large-scale negative carbon industry has broad commercial prospects in the carbon trading market under a dual-carbon environment. Considering the deep underground location of the storage sites, this invention first converts different solid and gaseous carbon-containing substances into carbon-containing liquids, which are then injected into the underground storage sites.

[0037] (2) This invention utilizes the filling and solidification effect of carbon-containing liquid on the cracks of rock and soil and its self-polymerization characteristics. In particular, it can form a grid-like closed structure of carbon-containing resource capping layer-CO2 storage layer in the storage well, which is to achieve long-term stable storage of CO2.

[0038] (3) This invention injects carbon-containing resources into deep underground layers, resulting in long-term storage. Furthermore, it can be reused at a suitable time later, depending on the actual situation.

[0039] (4) The process of this invention is simple and has a large processing capacity. The underground storage point of this invention is far away from the surface human living environment, avoiding the environmental pollution problems such as occupying land and polluting soil and groundwater. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the process flow of the present invention. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0042] Based on this invention, a complete method for underground storage, conversion, and reuse of carbon-containing resources is provided, such as... Figure 1As shown, it may include steps such as carbon-containing resource pretreatment, detection and modulation, infusion, solidification and reaction, and reuse (of course, the reuse step can also be separated and reused at an appropriate time according to actual needs), wherein:

[0043] (S1) Pretreatment of carbon-containing resources:

[0044] For solid carbon resources, in order to facilitate injection into the ground, it is necessary to convert solid carbon resources into carbon-containing liquids through physicochemical methods (such as pyrolysis, hydrothermal liquefaction, fermentation, liquid blending, etc.).

[0045] For liquid carbon-containing resources, start from step S2;

[0046] For CO2, it can be used either from step S3 (i.e., in conjunction with injection), or the gaseous CO2 can be liquefied or converted into a supercritical state, and the resulting liquefied or supercritical CO2 can be used as a liquid carbon resource, starting from step S2 (in this case, carbon-containing liquid can be injected separately in step S3).

[0047] (S2) Detection and Modulation: The liquid carbon-containing resources and the carbon-containing liquid obtained in step S1 are uniformly defined as carbon-containing liquid. They are then tested, for example, by determining their chemical composition, elemental analysis, industrial analysis, pH value, viscosity, specific gravity, solids content, and flash point, to clarify their polymerization and reaction characteristics. Polymerization characteristics include easy polymerization, moderate polymerization, and difficult polymerization, serving as a basis for adjusting the solidification process; reaction characteristics include the generation of combustible gases and the generation of non-combustible gases, serving as a basis for post-reaction reuse. Based on the above test results, combined with the geological conditions of the storage site and the cross-linking polymerization characteristics of the carbon-containing liquid, as well as the reuse objectives, the carbon-containing liquid is modified by mixing or adding chelating agents, polymerization inhibitors, and catalysts to improve its compatibility with the geological conditions of the storage site, making it easier to pour, solidify, and react.

[0048] (S3) Injection: Injecting carbon-containing resources into the underground storage site. Injection methods may include injecting carbon-containing liquid alone or injecting carbon-containing liquid and CO2 together. When injecting carbon-containing liquid, anti-coking measures shall be taken (e.g., casing circulating water cooling, phase change heat dissipation cooling, addition of polymerization inhibitors, etc., to avoid coking problems in the carbon-containing liquid pipe caused by the temperature rising as it goes deeper underground).

[0049] (S4) Curing or reaction:

[0050] For individual injection of carbon-containing liquid: After injection into the underground storage point, the carbon-containing liquid first flows, spreads, and penetrates into the cracks and fissures of the rock and soil at the bottom of the storage well due to its flow characteristics; then, under underground temperature and pressure, due to the self-polymerization characteristics of the carbon-containing liquid, it gradually polymerizes and solidifies, forming a hard and seamless carbon-containing rock and soil bed at the bottom of the storage well; subsequent injections of carbon-containing liquid continue to flow, spread, polymerize, and solidify on this carbon-containing rock and soil bed, thereby achieving the solidification and storage of carbon-containing resources.

[0051] For co-solidification and storage of carbon-containing liquids and CO2 through synergistic injection: carbon-containing liquids and CO2 can be injected alternately in a cyclic manner. CO2 is injected into the carbon-containing liquid layer that is about to solidify. By utilizing the filling and solidification effect of carbon-containing liquids on the cracks in the soil and rock and their self-polymerization characteristics, a grid-like closed structure of carbon-containing resource cap layer-CO2 storage layer is formed in the storage well, thereby achieving long-term stable storage of carbon-containing resources and CO2.

[0052] For the synergistic injection of carbon-containing liquid and CO2 to achieve the reaction: carbon-containing liquid and CO2 can be injected simultaneously. Under the action of the catalyst added to the carbon-containing liquid or the mineral catalyst in the sealed well, the reaction of carbon-containing liquid and CO2 is promoted under underground temperature and pressure conditions.

[0053] (S5) Reuse: This can include reuse after solidification and reuse after reaction, meaning that carbon-containing resources can be reused after solidification or reaction. For example, reuse after solidification is based on the transformation of carbon-containing liquid into a coal-like solid under long-term underground high pressure (≥5MPa) environment, which can be mined and utilized. Reuse after reaction is based on the reaction of carbon-containing liquid and CO2 under underground high pressure (≥5MPa) environment to generate combustible gases such as CH4, CO, and H2, which can be extracted to the surface for collection and reuse. Among them, the reaction can be the cracking reaction of the carbon-containing liquid itself under underground high pressure (≥5MPa) conditions, or the reaction of supercritical or liquid CO2 with carbon-containing liquid under underground high pressure and high temperature conditions.

[0054] Carbon-containing resources may include biomass (at least one of agricultural waste, forestry residues, wood chips, sawdust, algae, straw, bagasse, or animal manure), non-biomass solid waste (at least one of industrial waste, garbage, slag, sludge, waste tires, or automobile debris), liquefied products of the above resources (e.g., biodiesel, ethanol, edible oil, vegetable oil, vegetable oil solution containing microorganisms or algae, dispersion of biomass particles and / or biochar particles in water or other liquids, bio-oil, bio-oil by-products, biodiesel, biomass fermented ethanol), CO2, etc.

[0055] The storage site includes at least one of the following: depleted mines, abandoned mines, natural caves, salt caverns, difficult-to-mine strata, or other spaces beneath the surface. The storage site is located deep underground (depth ≥ 800 meters) and ≥ 50 meters below the aquifer to avoid contamination of groundwater resources after storage.

[0056] In step (S2), component modulation can be performed based on the test results, combined with the geological characteristics of the storage site and the reuse objectives. Modification methods include mixing carbon-containing liquids or adding chelating agents, polymerization inhibitors, catalysts, etc. For example, when carbon-containing liquids are difficult to polymerize and solidify with the soil and rock at the storage site, chelating agents or carbon-containing liquids with strong self-polymerization properties can be added to the carbon-containing liquids to improve compatibility and facilitate the solidification of the carbon-containing liquids at the storage site. When carbon-containing liquids polymerize early and have strong self-polymerization properties, polymerization inhibitors or carbon-containing liquids with low polymerization properties can be added to the carbon-containing liquids. In addition, catalysts can be added to the carbon-containing liquids to improve their reaction characteristics, facilitating the reaction of the carbon-containing liquids at the storage site.

[0057] In addition, the above methods can be implemented based on system hardware, such as tanks or containers for storage and mixing, pumps, mechanical filtration equipment, process piping, anti-coking equipment, sensors, and related control hardware.

[0058] The following are specific examples:

[0059] Example 1

[0060] Forestry waste (withered and fallen tree branches, etc.) from southwestern my country is collected, first crushed into particles with a diameter of 1-5mm, and then compressed into 10cm pellets. 3 The cubic biomass blocks were fed into a pyrolysis furnace and rapidly converted into bio-oil at 500℃. Testing revealed that the bio-oil contained 46.5% carbon, had a viscosity of 28 cSt (50℃), and a density of 1.24 kg / m³. 3 With a water content of 18.9%, the bio-oil exhibits easy polymerization characteristics (specifically, molecules with a molecular weight greater than 300 in a liquid can be defined as heavy components; the polymerization characteristics can be determined based on the content of heavy components. For example, easy polymerization corresponds to a heavy component content ≥50%, moderately easy polymerization corresponds to a heavy component content of 20-50%, and difficult polymerization corresponds to a heavy component content less than 20%). It is suitable for injection into a 1500m deep underground cave in Southwest China for solidification and storage. The cave temperature is 60℃, and the formation pressure is approximately 6.3MPa. An injection pressure of 7.6MPa was selected to inject the bio-oil into the underground cave. Under the conditions of 60℃ and 6.3MPa high pressure, the bio-oil gradually solidifies within 6 hours, thus achieving carbon sequestration. Each ton of forestry waste sealed is equivalent to approximately 37kg of CO2. Furthermore, the permanent solidification of the bio-oil stabilizes the geological formation and reduces the risk of collapse or other unstable geological conditions.

[0061] Example 2

[0062] Unlike Example 1, this example adds a chelating agent with a mass content of 1.5% to the bio-oil in Example 1. The bio-oil and CO2 are then alternately injected into the underground cavern. First, the bio-oil is injected to form a bio-oil layer at the bottom of the underground cavern. Before the bio-oil layer solidifies (about 5 hours after the bio-oil injection), CO2 (supercritical CO2 under pressure) is injected into the bio-oil layer. The injection volume is 30-50 wt% of the previous bio-oil injection volume. By utilizing the filling and solidification effect of bio-oil on the rock and soil fissures and its self-polymerization characteristics, a grid-like closed structure of carbon-containing resource capping layer-CO2 storage layer is formed in the storage well, thereby achieving long-term stable storage of carbon-containing resources and CO2.

[0063] Example 3

[0064] Unlike Example 1, the collected forestry waste is crushed into particles with an average particle size of 0.5-5mm, mixed with water to form a biomass particle-water dispersion with a biomass mass content of 60-70%, and injected into underground caverns at an injection pressure of 7.6MPa to achieve direct sequestration of carbon resources from forestry waste.

[0065] Example 4

[0066] High-carbon bio-oil (containing more than 70% carbon, such as wood chip pyrolysis oil and manure hydrothermal liquefaction oil) is an effective reducing agent. When high-carbon bio-oil is injected into the iron ore layer, the bio-oil permeates and solidifies in the ore layer, forming a high-carbon iron ore layer with bio-oil attached, which is iron ore containing a large amount of reducing agent. After mining, the amount of reducing agent used in iron smelting is greatly reduced, realizing the reuse of carbon resources after solidification.

[0067] Example 5

[0068] By simultaneously injecting bio-oil and CO2 underground, under high underground pressure, supercritical CO2 can extract the light components of the bio-oil and carry them back to the surface, while the heavy components remain underground, thus achieving the separation of light and heavy components in the bio-oil. The light components are mostly small molecule compounds that can be reused as chemical products, while the heavy components have stronger self-polymerization properties, which are conducive to underground solidification, enabling the direct underground sequestration of some carbon.

[0069] Example 6

[0070] Unlike Example 5, bio-oil with added catalyst (0.05% nickel powder and 0.01 mol / L silicotungstic acid in this example) and CO2 are simultaneously injected underground. Under underground high pressure and certain temperature conditions, CO2 reacts with bio-oil under the action of the catalyst to produce CO and CH4 gases, which are then collected back to the surface for reuse.

[0071] The above embodiments are merely examples. For instance, the present invention is applicable to underground storage sites at depths of ≥800 meters, where the underground pressure is often ≥5MPa. Of course, different burial depths correspond to different pressures and temperatures (taking a burial depth of 1.5km underground as an example, the underground temperature is generally 50-60℃).

[0072] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for underground storage and conversion of carbon-containing resources, characterized in that, This method targets solid carbon-containing resources and includes the following steps: (1) Convert solid carbon-containing resources into carbon-containing liquids through pretreatment; (2) The reaction characteristics of the carbon-containing liquid are detected, wherein the reaction characteristics are used as a basis for adjusting the reaction process; If the test results meet the preset requirements, the carbon-containing liquid will proceed to step (3). If the test results do not meet the preset requirements, the carbon-containing liquid is modified by mixing different carbon-containing liquids and / or adding additives, and the modified carbon-containing liquid is used for step (3); wherein the additives are at least one of chelating agents, polymerization inhibitors, and catalysts. (3) Injecting carbon-containing liquid into an underground storage point located at a depth of ≥800 meters underground, so that the carbon-containing liquid reacts at the underground storage point; wherein, the injection method is co-injection of carbon-containing liquid and CO2; and, anti-coking measures are taken simultaneously during injection. The injection method corresponding to the reaction is the co-injection of carbon-containing liquid and CO2. During the reaction process, under the pressure conditions at the underground storage point, the carbon-containing liquid and CO2 react to generate combustible gas products; the pressure conditions at the underground storage point are ≥5MPa. In step (1), the solid carbon resources are selected from biomass and carbon-containing solid non-biomass waste; The biomass includes at least one of agricultural waste, forestry residues, and algae; The carbon-containing solid non-biomass waste is carbon-containing solid industrial waste.

2. A method for underground storage and conversion of carbon-containing resources, characterized in that, This method targets liquid carbon-containing resources and includes the following steps: (i) Using liquid carbon-containing resources as carbon-containing liquids, the reaction characteristics of the carbon-containing liquids are detected, wherein the reaction characteristics are used as a basis for adjusting the reaction process; If the test results meet the preset requirements, the carbon-containing liquid will proceed to step (ii). If the test results do not meet the preset requirements, the carbon-containing liquid is modified by mixing different carbon-containing liquids and / or adding additives, and the modified carbon-containing liquid is used for step (ii); wherein the additives are at least one of chelating agents, polymerization inhibitors, and catalysts. (ii) Injecting carbon-containing liquid into an underground storage point located at a depth of ≥800 meters underground, so that the carbon-containing liquid reacts at the underground storage point; wherein the injection method is the co-injection of carbon-containing liquid and CO2, and anti-coking measures are taken simultaneously during injection; The injection method corresponding to the reaction is the co-injection of carbon-containing liquid and CO2. During the reaction process, under the pressure conditions at the underground storage point, the carbon-containing liquid and CO2 react to generate combustible gas products; the pressure conditions at the underground storage point are ≥5MPa. In step (i), the liquid carbon-containing resource is a liquefied product of biomass and / or carbon-containing solid non-biomass waste or a dispersion dispersed in a liquid; The biomass includes at least one of agricultural waste, forestry residues, and algae; The carbon-containing solid non-biomass waste is carbon-containing solid industrial waste.

3. The method for underground storage and conversion of carbon-containing resources as described in claim 1 or 2, characterized in that, In step (3) or step (ii), the reaction is specifically a reaction between supercritical or liquid CO2 and carbon-containing liquid under underground pressure conditions.

4. The method for underground storage and conversion of carbon-containing resources as described in claim 1 or 2, characterized in that, The method also includes a subsequent reuse step, wherein the reuse after the reaction involves drawing the combustible gas generated by the reaction out to the ground for collection, so as to achieve reuse.

5. The method for underground storage and conversion of carbon-containing resources as described in claim 2, characterized in that, In step (i), the liquid carbon resource is at least one of biodiesel, ethanol, a solution containing microorganisms or algae, or a dispersion of biomass particles in water or other liquids.

6. The method for underground storage and conversion of carbon-containing resources as described in claim 2, characterized in that, In step (i), the liquid carbon-containing resource is bio-oil.

7. The method for underground storage and conversion of carbon-containing resources as described in claim 2, characterized in that, In step (i), the liquid carbon resource is biomass fermented ethanol.

8. The method for underground storage and conversion of carbon-containing resources as described in claim 2, characterized in that, The liquid carbon resource is a dispersion of biochar particles in water or other liquids.

9. The method for underground storage and conversion of carbon-containing resources as described in claim 1 or 2, characterized in that, The biomass includes at least one of sawdust, straw, bagasse, and animal manure.

10. The method for underground storage and conversion of carbon-containing resources as described in claim 1 or 2, characterized in that, The carbon-containing solid non-biomass waste includes at least one of carbon-containing slag and waste tires.

11. The method for underground storage and conversion of carbon-containing resources as described in claim 1 or 2, characterized in that, The carbonaceous solid non-biomass waste is automobile crushing residue.

12. The method for underground storage and conversion of carbon-containing resources as described in claim 1 or 2, characterized in that, In step (3) or step (ii), the anti-coking measures include at least one of the following: casing circulating water cooling, phase change heat dissipation cooling, and addition of polymerization inhibitor, in order to avoid coking of carbon-containing liquid in the injection pipe.

13. The method for underground storage and conversion of carbon-containing resources as described in claim 1 or 2, characterized in that, In step (3) or step (ii), the underground sealing point includes at least one of abandoned mine shafts, natural caves, difficult-to-mine mineral layers, or rock and soil pores; Furthermore, the underground sealing point is located at a depth of ≥800 meters underground and is ≥50 meters below the underground aquifer.

14. The method for underground storage and conversion of carbon-containing resources as described in claim 1 or 2, characterized in that, In step (3) or step (ii), the underground storage point is a salt cavern; Furthermore, the underground sealing point is located at a depth of ≥800 meters underground and is ≥50 meters below the underground aquifer.

15. The method for underground storage and conversion of carbon-containing resources as described in claim 1 or 2, characterized in that, In step (2) or step (i), the pre-set requirements are pre-set based on the geological characteristics of the underground storage site.

16. The method for underground storage and conversion of carbon-containing resources as described in claim 15, characterized in that, The pre-set requirements are based on the geological characteristics of the underground storage site and the reuse objectives.

17. The method for underground storage and conversion of carbon-containing resources as described in claim 1, characterized in that, In step (1), the pretreatment utilizes at least one of pyrolysis, hydrothermal liquefaction, fermentation, and liquid blending.

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