Method and system for preparing underground storage of carbon-containing liquid from organic solid waste

Abstract

The present invention belongs to the technical field related to carbon sequestration of organic solid waste, and discloses a method and system for preparing underground carbon-containing liquid from organic solid waste. The method comprises: S1 detecting and classifying organic solid waste, and liquefying and converting the organic solid waste to obtain carbon-containing liquid; S2 solidifying the carbon-containing liquid under geological parameters, comparing the solidification time with a preset time threshold, and when it is greater than the preset time threshold, adjusting the liquefaction method and parameters until the solidification time is less than the preset time threshold; S3 constructing a database of liquefaction methods and parameters of organic solid waste under different geological parameters and solidification times in a one-to-one correspondence; S4 matching the liquefaction method and parameters in the database for the organic solid waste to be processed according to the actual geological parameters and solidification time, and performing carbon sequestration according to the liquefaction method and parameters. Through the present invention, the problem of difficulty in determining the liquefaction method and liquefaction parameters for liquefaction and sequestration of organic solid waste is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field related to carbon sequestration of organic solid waste, and more specifically, relates to a method and system for preparing underground sequestration of carbon-containing liquid using organic solid waste. Background Art

[0002] As a significant source of carbon, direct disposal of organic solid waste not only causes a degree of environmental pollution, but also generates significant carbon emissions through its slow oxidation in the air. For example, approximately 1 billion tons of agricultural and forestry waste are generated annually. Direct on-site incineration or disposal of this waste would result in approximately 1.65 billion tons of carbon emissions, accounting for approximately 10-15% of total carbon emissions. However, there are currently no proven methods for reducing carbon emissions, and the potential for such reductions is enormous. Furthermore, while carbon reduction methods for organic solid waste, such as municipal waste and industrial sludge, are relatively mature, they primarily rely on landfilling, which carries high transportation costs and environmental and site costs.

[0003] Liquefying organic solid waste into carbonaceous liquids offers advantages such as high carbon density, ease of storage and transportation, and the potential for further geological storage, leading to large-scale carbon reduction. Based on this, the present invention proposes a method and system for producing carbonaceous liquids from organic solid waste that are suitable for underground storage. Summary of the Invention

[0004] In response to the above-mentioned defects or improvement needs of the prior art, the present invention provides a method and system for preparing underground carbon-containing liquids from organic solid waste to solve the problem of carbon sequestration of organic solid waste in geological environments.

[0005] To achieve the above objectives, according to one aspect of the present invention, a method for preparing underground storage of carbonaceous liquid from organic solid waste is provided, the method comprising the following steps:

[0006] S1 tests the organic solid waste and classifies it according to the test results, thereby obtaining a variety of different types of organic solid waste; different liquefaction methods and parameters are used to liquefy the different types of organic solid waste, thereby obtaining different carbon-containing liquids;

[0007] S2: obtaining geological parameters of the pre-sealing site, solidifying the carbonaceous liquid under the geological parameters, recording the solidification time, comparing the solidification time with a preset time threshold, and if the solidification time is less than the preset time threshold, saving the liquefaction method and parameters corresponding to the solidification time; and if the solidification time is greater than the preset time threshold, adjusting the liquefaction method and parameters until the solidification time is less than the preset time threshold;

[0008] S3 updates the organic solid waste or geological parameters and returns to step S1 until a database is formed that corresponds to liquefaction methods and parameters and solidification times for different types of organic solid waste under different geological parameters.

[0009] S4 For the organic solid waste to be treated, after classifying it using the method in step S1 to obtain different categories of organic solid waste, the different categories of organic solid waste are matched in the database according to the actual geological parameters and solidification time to obtain corresponding liquefaction methods and parameters, and the organic solid waste is carbon-sealed according to the liquefaction method and parameters to obtain carbon-containing liquid that meets the geological parameter and solidification time requirements.

[0010] Further preferably, in step S1, the organic solid waste includes but is not limited to agricultural and forestry waste, industrial organic waste, food production waste, domestic garbage, or a combination thereof.

[0011] Further preferably, in step S1, the detection is performed according to the following methods: a combination of one or more of a two-step sulfuric acid hydrolysis method for determining the three-component content of biomass, density determination, industrial analysis, elemental analysis, Raman spectroscopy, infrared spectroscopy, and the like.

[0012] Further preferably, in step S1, the classification is performed according to physicochemical properties, and the physicochemical properties are viscosity, density, elemental composition, carbon skeleton structure and active functional group composition.

[0013] Further preferably, in step S1, the liquefaction method is thermal dissolution, extraction, pyrolysis liquefaction or hydrothermal liquefaction.

[0014] Further preferably, in step S1, the liquefaction parameters are one or more of temperature, pressure, heating rate, extractant and catalyst.

[0015] Further preferably, in step S2, the geological parameters are one or more of mineral composition, temperature and pressure.

[0016] According to another aspect of the present invention, a system for applying the above-mentioned method of preparing underground carbonaceous liquid from organic solid waste is provided. The system comprises: a detection and classification module, a liquefaction conversion module, an experimental testing module, and a data storage and retrieval matching module, wherein:

[0017] The detection and classification module is used to detect organic solid waste and classify it according to its physical and chemical properties;

[0018] The liquefaction conversion module is used to convert organic solid waste into carbon-containing liquid;

[0019] The experimental testing module is used to perform experimental testing on the obtained carbon-containing liquid to determine whether the carbon-containing liquid meets the preset solidification conditions;

[0020] The data storage is used to store liquefaction methods and parameter data of different types of organic solid waste under different geological parameters;

[0021] The retrieval and matching module is used to quickly search and match given organic solid waste information, and quickly obtain carbonaceous liquid liquefaction methods and parameters that are conducive to storage under different geological conditions.

[0022] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0023] 1. The method of the present invention can obtain relatively consistent and stable carbonaceous liquid by pre-detecting and classifying organic solid waste. This can effectively avoid the carbonaceous liquid obtained from different sources from being coked and blocked in the pipeline when it is subsequently sealed underground, causing accidents.

[0024] 2. The method of the present invention uses the complete solidification time of carbonaceous liquids under geological conditions as an indicator, comprehensively considers the coupling of multiple factors such as the storage geological characteristics, the characteristics of the organic solid waste feedstock, and the liquefaction conversion method, and uses small-scale laboratory experiments to simulate the actual geological storage environment through continuous iteration. This method can obtain a carbonaceous liquid liquefaction conversion method that meets the storage geological characteristics and the characteristics of the organic solid waste feedstock at the lowest possible cost.

[0025] 3. The database formed by the system of the present invention can not only quickly provide the method and parameters for liquefying and converting a given organic solid waste into a carbon-containing liquid, but can also further use big data analysis to provide the types of organic solid waste in different urban areas of my country and the applicable liquefaction conversion methods, and has the potential for big data mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention provides a method for underground storage of carbonaceous liquids from organic solid wastes according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is 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 for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0028] A method for preparing underground storage of carbonaceous liquid using organic solid waste, the method comprising the following steps:

[0029] S1 tests the organic solid waste to be treated and classifies it according to its physical and chemical properties to obtain different types of organic solid waste;

[0030] S2 liquefies the organic solid waste obtained in S1 using a preset liquefaction method and parameters to obtain a carbon-containing liquid;

[0031] S3 obtains geological parameters of the pre-sealing site, conducts a solidification experiment on the carbonaceous liquid obtained in S2 under the parameters, records the time required for the carbonaceous liquid to be completely solidified, and compares it with a preset value;

[0032] S4: If the time required for the carbonaceous liquid to completely solidify in S3 is less than or equal to a preset value, the geological parameters of the pre-sealed site, the liquefaction method and parameters of the carbonaceous liquid are entered into the database; if the time required for the carbonaceous liquid to completely solidify in S3 is greater than the preset value, the liquefaction method or parameters are adjusted, and S2 and S3 are repeated until the experimental test is qualified, and the geological parameters of the pre-sealed site, the liquefaction method and parameters of the carbonaceous liquid are entered into the database;

[0033] S5 repeats S2, S3, and S4 to construct a liquefaction method and parameter database matching different types of organic solid waste under different geological parameters;

[0034] S6 uses the detection method in S1 to detect and classify a certain organic solid waste to be treated, and then matches and searches with the database in S5 to obtain liquefaction methods and parameters under different geological conditions, thereby preparing carbon-containing liquid that is conducive to underground storage.

[0035] Furthermore, in S1, the organic solid waste includes but is not limited to agricultural and forestry waste, industrial organic waste, food production waste, domestic garbage, or a combination thereof;

[0036] Furthermore, in S1, the detection method includes but is not limited to a combination of one or more of a two-step sulfuric acid hydrolysis method for determining the three-component content of biomass, density determination, industrial analysis, elemental analysis, Raman spectroscopy, infrared spectroscopy, and the like;

[0037] Furthermore, in S1, the physicochemical properties include but are not limited to viscosity, density, elemental composition, carbon skeleton structure, active functional group composition, etc.;

[0038] Furthermore, in S2, the liquefaction method includes but is not limited to thermal dissolution, extraction, pyrolysis liquefaction, hydrothermal liquefaction, etc.;

[0039] Further, in S2, the parameter categories include but are not limited to temperature, pressure, heating rate, extractant, catalyst, etc.;

[0040] Furthermore, in S3, the geological parameters include but are not limited to mineral composition, temperature, pressure, etc.;

[0041] Further, in S3, the preset value is 0.5 to 12 hours;

[0042] The present invention will be further described below with reference to specific embodiments.

[0043] Example

[0044] S1. A three-component biomass content of organic solid waste from agricultural and forestry waste was determined using a two-step sulfuric acid hydrolysis method. The three-component contents of cellulose, hemicellulose, and lignin were 35.18%, 25.37%, and 19.74%, respectively. First, pyrolysis and liquefaction were performed at 500°C with a slow heating rate (0.5-5°C / s). A carbonaceous liquid was obtained after condensation. The solidification test conditions for the carbonaceous liquid were taken from a geological location 1 km underground at a temperature of 60°C and a pressure of 10 MPa. The liquid was completely solidified after 2 hours, which was longer than the designed solidification time of 0.5 hours. The liquefaction parameters were further adjusted to 550°C with a fast heating rate (>200°C / s). The carbonaceous liquid obtained after condensation was further solidified at a temperature of 60°C and a pressure of 10 MPa. The liquid was completely solidified after 0.5 hours, which was less than or equal to the designed solidification time of 0.5 hours, meeting the requirements. The three-component contents of the sample, pyrolysis method and parameters, geological storage conditions, and complete solidification time were entered into a database for retrieval.

[0045] S2. Industrial analysis was used to determine the composition of a certain industrial papermaking sludge organic solid waste: 50.6% volatile matter, 7.2% fixed carbon, 5% moisture, and 37.2% ash. Pyrolysis and liquefaction were first performed at 400°C with a moderate heating rate (20-50°C / s). A carbonaceous liquid was obtained after condensation. The solidification experimental test conditions for the carbonaceous liquid were 48°C and 6 MPa at a depth of 600 km. The sample was fully solidified after 10 hours, which was less than or equal to the designed solidification time of 12 hours, meeting the requirements. The industrial analysis results, pyrolysis method and parameters, geological conditions for storage, and complete solidification time were entered into a database for retrieval.

[0046] S3. The three-component content of biomass in a certain agricultural and forestry waste to be sealed was determined using a two-step sulfuric acid hydrolysis method. The cellulose, hemicellulose, and lignin contents were found to be 32.12%, 27.56%, and 21.08%, respectively. A search and match with the data in the database revealed that the three-component contents of the agricultural and forestry waste differed by no more than 10% from those in Example 1. Therefore, at 1 km underground, under geological conditions of 60°C and 10 MPa, a pyrolysis liquefaction method at 550°C and a rapid heating rate (>200°C / s) was used to obtain a carbonaceous liquid suitable for sealing.

[0047] It will be easily understood by those skilled in the art 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 in the scope of protection of the present invention.

Claims

1. A method for preparing underground carbon-containing liquid from organic solid waste, characterized in that: The method comprises the following steps: S1 tests the organic solid waste and classifies it according to the test results, thereby obtaining a variety of different types of organic solid waste; different liquefaction methods and parameters are used to liquefy the different types of organic solid waste, thereby obtaining different carbon-containing liquids; S2: obtaining geological parameters of the pre-sealing site, solidifying the carbonaceous liquid under the geological parameters, recording the solidification time, comparing the solidification time with a preset time threshold, and if the solidification time is less than the preset time threshold, saving the liquefaction method and parameters corresponding to the solidification time; and if the solidification time is greater than the preset time threshold, adjusting the liquefaction method and parameters until the solidification time is less than the preset time threshold; S3 updates the organic solid waste or geological parameters and returns to step S1 until a database is formed that corresponds to liquefaction methods and parameters and solidification times for different types of organic solid waste under different geological parameters. S4 For the organic solid waste to be treated, after classifying it using the method in step S1 to obtain different categories of organic solid waste, the different categories of organic solid waste are matched in the database according to the actual geological parameters and solidification time to obtain corresponding liquefaction methods and parameters, and the organic solid waste is carbon-sealed according to the liquefaction method and parameters to obtain carbon-containing liquid that meets the geological parameter and solidification time requirements.

2. The method for preparing underground storage of carbonaceous liquid from organic solid waste according to claim 1, characterized in that: In step S1, the organic solid waste includes but is not limited to agricultural and forestry waste, industrial organic waste, food production waste, domestic waste or a combination thereof.

3. The method for preparing underground storage of carbonaceous liquid from organic solid waste according to claim 1, characterized in that: In step S1, the detection is performed according to the following methods: a combination of one or more of a two-step sulfuric acid hydrolysis method for determining the three-component content of biomass, density determination, industrial analysis, elemental analysis, Raman spectroscopy, and infrared spectroscopy.

4. The method for preparing underground storage of carbonaceous liquid from organic solid waste according to claim 3, characterized in that: In step S1, the classification is performed according to physicochemical properties, which are viscosity, density, elemental composition, carbon skeleton structure and active functional group composition.

5. The method for preparing underground storage of carbonaceous liquid from organic solid waste according to claim 2 or 3, characterized in that: In step S1, the liquefaction method is thermal dissolution, extraction, pyrolysis liquefaction or hydrothermal liquefaction.

6. The method for preparing underground storage of carbonaceous liquid from organic solid waste according to claim 5, characterized in that: In step S1, the liquefaction parameters are one or more of temperature, pressure, heating rate, extractant and catalyst.

7. The method for preparing underground storage of carbonaceous liquid from organic solid waste according to claim 6, characterized in that: In step S2, the geological parameters are one or more of mineral composition, temperature and pressure.

8. A system for use in the method for preparing underground storage of carbonaceous liquid from organic solid waste according to any one of claims 1 to 7, characterized in that: The system includes: a detection and classification module, a liquefaction conversion module, an experimental test module, and a data storage and retrieval matching module, wherein: The detection and classification module is used to detect organic solid waste and classify it according to its physical and chemical properties; The liquefaction conversion module is used to convert organic solid waste into carbon-containing liquid; The experimental testing module is used to perform experimental testing on the obtained carbon-containing liquid to determine whether the carbon-containing liquid meets the preset solidification conditions; The data storage is used to store liquefaction methods and parameter data of different types of organic solid waste under different geological parameters; The retrieval and matching module is used to quickly search and match given organic solid waste information, and quickly obtain carbonaceous liquid liquefaction methods and parameters that are conducive to storage under different geological conditions.

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