Subsurface co-solidification process and system for carbon-containing liquid and carbon-containing gas

Abstract

The present application belongs to the field of carbon emission reduction and carbon sequestration, and specifically discloses a method and system for co-solidification of carbon-containing liquid and carbon-containing gas underground, which is based on actual geological conditions and preset reactant types and proportions, predicts the theoretical hourly conversion rate of carbon-containing gas and the theoretical hourly solidification rate of carbon-containing liquid during the co-solidification reaction of the carbon-containing liquid and the carbon-containing gas to be sequestrated, and further determines the injection mode of the carbon-containing liquid and the carbon-containing gas: if the theoretical hourly conversion rate of the carbon-containing gas is greater than 10%, the carbon-containing liquid and the carbon-containing gas are injected simultaneously; otherwise, the carbon-containing liquid is injected first, and when the theoretical solidification degree of the carbon-containing liquid is greater than 80%, the carbon-containing gas is injected, so as to realize the co-solidification of the carbon-containing gas and the carbon-containing liquid underground. The present application utilizes the reaction between the carbon-containing liquid and the carbon-containing gas, and specifically selects the co-solidification method underground, so as to greatly improve the underground carbon sequestration efficiency, realize the co-solidification of the carbon-containing liquid and the carbon-containing gas with a wide source, and achieve large-scale underground carbon sequestration.

Description

Technical Field

[0001] This invention belongs to the field of carbon emission reduction and carbon sequestration, and more specifically, relates to a method and system for underground co-solidification of carbon-containing liquids and carbon-containing gases. Background Technology

[0002] With the intensification of human economic and engineering activities, the proper handling of organic solid waste and greenhouse gases presents a formidable challenge. Direct disposal of organic solid waste leads to substantial carbon emissions, causing severe environmental pollution. Therefore, it is necessary to explore and develop new technologies for the large-scale, efficient treatment of organic waste and greenhouse gases.

[0003] Conventional methods for treating organic solid waste mainly include landfilling and incineration, but these methods generate large amounts of greenhouse gases such as carbon dioxide, harming the environment. However, organic solid waste is actually a potentially abundant carbon resource that can be transformed into carbon-containing liquids with high carbon content, high reactivity, and high fluidity through various conversion methods. These carbon-containing liquids are rich in oxygen-containing active functional groups and are prone to self-polymerization under high pressure to produce coke. Summary of the Invention

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a method and system for underground co-solidification of carbon-containing liquids and carbon-containing gases, the purpose of which is to achieve efficient underground co-solidification of widely available carbon-containing liquids and carbon-containing gases.

[0005] To achieve the above objectives, according to one aspect of the present invention, a method for underground co-solidification of carbon-containing liquid and carbon-containing gas is proposed, comprising the following steps:

[0006] Based on actual geological conditions and the pre-set reactant types and ratios, the theoretical hourly conversion rate of the carbon-containing gas and the theoretical hourly solidification rate of the carbon-containing liquid are predicted during the co-solidification reaction of the carbon-containing liquid and carbon-containing gas to be sealed. Therefore, the injection methods for the carbon-containing liquid and carbon-containing gas are determined as follows:

[0007] If the theoretical hourly conversion rate of carbon-containing gas is greater than 10%, then carbon-containing liquid and carbon-containing gas are injected simultaneously, and the actual hourly conversion rate of carbon-containing gas is monitored in real time to dynamically adjust the injection rate of carbon-containing liquid and carbon-containing gas, so as to achieve underground co-solidification of carbon-containing gas and carbon-containing liquid.

[0008] If the theoretical hourly conversion rate of carbon-containing gas is no more than 10%, then carbon-containing liquid is injected first. After the carbon-containing liquid is predicted to be more than 80% solidified based on the theoretical hourly solidification rate of carbon-containing liquid, carbon-containing gas is injected. The actual hourly conversion rate of carbon-containing gas is monitored in real time to dynamically adjust the injection rate of carbon-containing liquid and carbon-containing gas, so as to achieve underground co-solidification of carbon-containing gas and carbon-containing liquid.

[0009] As a further preferred method, the actual hourly conversion rate of carbon-containing gas can be calculated by real-time detection of headspace gas concentration.

[0010] As a further preferred option, if the theoretical hourly conversion rate of carbon-containing gas is greater than the actual hourly conversion rate of carbon-containing gas, then the injection rate of carbon-containing liquid is kept constant while the injection rate of carbon-containing gas is decreased; otherwise, the injection rate of carbon-containing gas is kept constant while the injection rate of carbon-containing liquid is increased.

[0011] As a further preferred method, the theoretical hourly conversion rate of carbon-containing gas and the theoretical hourly solidification rate of carbon-containing liquid are predicted using a pre-constructed reaction model; the reaction model is constructed as follows:

[0012] In the laboratory, the co-curing reaction of carbon-containing liquid and carbon-containing gas was simulated under different geological conditions and reactant ratios. The changes in the curing rate of carbon-containing liquid and the conversion rate of carbon-containing gas over time were obtained, and the corresponding theoretical hourly conversion rate of carbon-containing gas and theoretical hourly curing rate of carbon-containing liquid were obtained.

[0013] As a further preferred option, during laboratory simulations, the reactant ratio, i.e., the mass percentage of carbon-containing gas and carbon-containing liquid, ranges from 0% to 100%; geological conditions include temperature and pressure, with the temperature range from 20°C to 100°C and the pressure range from 1.6 MPa to 20 MPa.

[0014] As a further preferred method, the carbon-containing gas is injected by extending the ventilation pipe below the level of the underground carbon-containing liquid and injecting the carbon-containing gas into the ground in a bubbling manner under pressure.

[0015] As a further preferred embodiment, the carbon-containing liquid is a liquid containing one or more carbon atoms generated through the conversion of biomass or organic waste.

[0016] As a further preferred embodiment, the carbon-containing gas is at least one of the gases containing one or more carbon atoms.

[0017] As a further preferred option, the actual hourly conversion rate of carbon-containing gas is calculated based on the real-time headspace gas concentration. When the actual hourly conversion rate of carbon-containing gas is 0, the injection of carbon-containing gas and carbon-containing liquid is stopped.

[0018] According to another aspect of the present invention, an underground co-curing system for carbon-containing liquids and carbon-containing gases is provided, comprising a processor for performing the above-described underground co-curing method for carbon-containing liquids and carbon-containing gases.

[0019] In summary, compared with the prior art, the above-described technical solutions conceived by this invention mainly possess the following technical advantages:

[0020] 1. This invention is based on the theoretical hourly conversion rate of carbon-containing gas to determine the reactivity between the carbon-containing liquid and the carbon-containing gas to be sealed, thereby selecting the sealing and injection method accordingly. At the same time, based on the online detection of the actual conversion rate of carbon-containing gas, the co-solidification reaction process of carbon-containing liquid and carbon-containing gas is dynamically adjusted to achieve efficient underground co-solidification of widely available carbon-containing liquid and carbon-containing gas, and realize large-scale underground carbon fixation.

[0021] 2. This invention is based on an online headspace gas concentration detection device, which dynamically adjusts the injection rate of carbon-containing liquid and carbon-containing gas, thereby regulating the co-solidification reaction process and significantly improving underground carbon sequestration efficiency and overall energy efficiency.

[0022] 3. Based on the physicochemical properties of carbon-containing liquids and gases, this invention establishes a database of the solidification rate of carbon-containing liquids and the conversion rate of carbon-containing gases under different underground reaction conditions by simulating different underground reaction conditions in the laboratory. This allows for the construction of a multi-parameter mathematical reaction model for the underground co-solidification and storage of carbon-containing liquids and gases, facilitating rapid use in practical applications.

[0023] 4. This invention fully utilizes the strong surface tension of carbon-containing liquids and selects a bubbling method when injecting carbon-containing gas, so that the carbon-containing liquid seals the carbon-containing gas like a dense oil film, and increases the contact area between the carbon-containing liquid and the carbon-containing gas, thereby improving the efficiency of underground co-solidification.

[0024] 5. This invention utilizes the synthesis reaction between carbon-containing liquids and carbon-containing gases, as well as the polymerization reaction of the carbon-containing liquids themselves, to achieve efficient, large-scale, and flexible disposal of organic waste in a one-step process without the need for additives, while simultaneously achieving the co-encapsulation of carbon-containing gases. Attached Figure Description

[0025] Figure 1 This is a flowchart of the underground co-solidification method for carbon-containing liquid and carbon-containing gas according to an embodiment of the present invention. Detailed Implementation

[0026] 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.

[0027] Carbon-containing liquids prepared from organic solid waste are rich in oxygen-containing active functional groups, which readily undergo self-polymerization under high pressure to form coke. The unsaturated active functional groups in the carbon-containing liquid can break bonds under high pressure; the resulting free radicals undergo addition reactions with carbon-containing gases to generate carbon-containing liquids with larger molecular weights, further promoting the polymerization reaction. Therefore, this invention, based on the physicochemical properties of carbon-containing liquids and gases, utilizes the reaction between them to establish a reaction model, selectively choosing underground co-solidification methods, and dynamically adjusting the co-solidification reaction process using online monitoring devices. This invention proposes an underground co-solidification method for carbon-containing liquids and gases, such as… Figure 1 As shown, it includes the following steps:

[0028] S1. Construct a multi-parameter mathematical model, i.e., a reaction model, to show the changes in the solidification rate of carbon-containing liquid and the conversion rate of carbon-containing gas over time under different reactant ratios and geological conditions.

[0029] Specifically, the reaction model utilizes different carbon-containing gases and liquids, with the mass percentages of carbon-containing gas and liquid ranging from 0% to 100%, i.e., a mass ratio of (0 to 1):1. It primarily leverages the synthetic reaction between the unsaturated active components in the carbon-containing liquid and the carbon-containing gas; therefore, the amount of carbon-containing gas reacting must not exceed that of the carbon-containing liquid. Simultaneously, data on the self-polymerization curing rate of the carbon-containing liquid over time are recorded. The co-curing reaction is conducted under simulated geological conditions in the laboratory. These conditions specifically include a temperature range of 20–100℃, encompassing temperatures from room temperature to above 1 km underground, and a pressure range of 1.6–20 MPa, applicable to pressure ranges from 100 m to 1 km underground.

[0030] S2. Based on actual geological conditions and reactant types and ratios, the theoretical hourly conversion rate of the carbon-containing gas and the theoretical hourly solidification rate of the carbon-containing liquid are obtained according to the reaction model during the co-solidification reaction of the carbon-containing liquid and carbon-containing gas to be sealed. This allows for the determination of the reactivity between the carbon-containing liquid and carbon-containing gas to be sealed, and the determination of the injection method for the carbon-containing liquid and carbon-containing gas.

[0031] If the theoretical hourly conversion rate of carbon-containing gas is greater than 10%, then the reactivity between the carbon-containing liquid and the carbon-containing gas to be sealed is strong, and the carbon-containing gas and carbon-containing liquid can generally be co-cured within 12 hours; then, carbon-containing liquid and carbon-containing gas are injected simultaneously, and the injection rate of carbon-containing liquid and carbon-containing gas is dynamically adjusted based on the online detection of headspace gas concentration to achieve underground co-curing of carbon-containing gas and carbon-containing liquid.

[0032] If the theoretical hourly conversion rate of carbon-containing gas is no greater than 10%, the reactivity between the carbon-containing liquid and the carbon-containing gas to be sealed is weak. Therefore, carbon-containing liquid is pre-injected, and after the carbon-containing liquid's solidification degree is predicted to be greater than 80% based on the reaction model, carbon-containing gas is then injected. The headspace gas concentration is monitored online, and the injection rates of the carbon-containing liquid and carbon-containing gas are dynamically adjusted to achieve underground co-solidification of the carbon-containing gas and liquid. Specifically, for carbon-containing liquids and gases with weak reactivity, carbon-containing liquid is pre-injected and allowed to solidify to greater than 80%, forming a hard, dense, but slightly loose oil film. This facilitates the injection of carbon-containing gas into the oil film, similar to a protective layer that encapsulates the carbon-containing gas to prevent its escape.

[0033] Furthermore, the benchmark for dynamic adjustment is to compare the theoretical hourly conversion rate of carbon-containing gas calculated by the reaction model with the actual hourly conversion rate of carbon-containing gas calculated by online headspace gas detection: if the theoretical hourly conversion rate of carbon-containing gas is greater than the actual hourly conversion rate, it indicates that there is too much actual carbon-containing gas, and the injection rate of carbon-containing liquid should be reduced while keeping the injection rate of carbon-containing liquid constant in order to increase the reaction rate between carbon-containing gas and carbon-containing liquid; otherwise, it indicates that there is still a surplus of injected carbon-containing liquid, and the injection rate of carbon-containing liquid should be increased while keeping the injection rate of carbon-containing gas constant.

[0034] Furthermore, when the actual hourly conversion rate of carbon-containing gas calculated based on the online headspace gas concentration is 0, the injection of carbon-containing gas and carbon-containing liquid is stopped.

[0035] Furthermore, the injection of carbon-containing gas involves extending a ventilation pipe below the level of the underground carbon-containing liquid and injecting the carbon-containing gas into the ground under pressure in a bubbling manner. This fully utilizes the strong surface tension of the carbon-containing liquid itself. By selecting a bubbling method during the injection of carbon-containing gas, the carbon-containing liquid acts like a dense oil film to seal the carbon-containing gas and increases the contact area between the carbon-containing liquid and carbon-containing gas, achieving efficient underground co-solidification of widely available carbon-containing liquids and carbon-containing gases.

[0036] Specifically, carbon-containing liquids are liquids containing one or more carbon atoms generated from the conversion of organic matter such as biomass, solid waste, and medical waste. Carbon-containing gases are at least one of the following gases containing one or more carbon atoms: carbon dioxide, carbon monoxide, methane, etc.

[0037] The following are specific embodiments.

[0038] Example 1

[0039] (a) Straw is converted into a carbon-containing liquid by rapid pyrolysis at 500℃;

[0040] (b) The geological temperature of 60℃ and the pressure of 10MPa at a depth of 1km underground were taken as the test conditions for the co-solidification experiment of carbon-containing liquid and carbon-containing gas. According to the reaction model, the methane conversion rate per hour was 1.24%.

[0041] (c) Inject carbon-containing liquid into a closed pressurized reactor at a rate of 10 kg / h;

[0042] (d) When the percentage of solidified carbon-containing liquid is greater than 80% according to the reaction model, methane is injected at a rate of 10 kg / h through the venting pipe under pressure.

[0043] (e) Stop injecting methane and carbon-containing liquids when the actual methane conversion rate per hour, calculated based on the online headspace gas concentration, is 0.

[0044] (f) After 16 hours, both the carbon-containing liquid and the methane were completely solidified.

[0045] Example 2

[0046] (a) Plastic is converted into a carbon-containing liquid by rapid pyrolysis at 550°C;

[0047] (b) The geological temperature at an underground ambient temperature of 20°C and the pressure of 20MPa were taken as the test conditions for the co-solidification experiment of carbon-containing liquid and CO2. According to the reaction model, the CO2 conversion rate per hour was 15.36%.

[0048] (c) Simultaneously inject carbon-containing liquid and carbon-containing gas into a closed pressurized reactor at a rate of 10 kg / h;

[0049] (d) When the actual CO2 hourly conversion rate calculated based on the online headspace gas concentration is 0, stop injecting CO2 and carbon-containing liquid;

[0050] (e) After 8 hours, both the carbon-containing liquid and CO2 are completely solidified.

[0051] Example 3

[0052] (a) Medical waste is converted into carbon-containing liquid by rapid pyrolysis at 500°C;

[0053] (b) The geological temperature of 48°C and the pressure of 6MPa at a depth of 600m underground were taken as the test conditions for the co-solidification experiment of carbon-containing liquid and CO. According to the reaction model, the CO conversion rate per hour was 6.59%.

[0054] (c) Inject carbon-containing liquid into a closed pressurized reactor at a rate of 10 kg / h;

[0055] (d) When the percentage of solidified carbon-containing liquid is greater than 80% as predicted by the reaction model, CO is injected at a rate of 10 kg / h through the venting pipe under pressure.

[0056] (e) Stop injecting CO and carbon-containing liquid when the actual CO conversion rate per hour, calculated based on the online headspace gas concentration, is 0.

[0057] (f) After 10 hours, both the carbon-containing liquid and CO were completely cured.

[0058] 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 the in situ co-solidification of a carbon-containing liquid and a carbon-containing gas, characterized in that, The method comprises the following steps: Based on the actual geological conditions and the preset types and proportions of the reactants, the theoretical hourly conversion rate of the carbon-containing gas and the theoretical hourly solidification rate of the carbon-containing liquid are predicted during the co-solidification reaction of the carbon-containing liquid and the carbon-containing gas to be sealed, and then the injection mode of the carbon-containing liquid and the carbon-containing gas is determined as follows: If the theoretical hourly conversion rate of the carbon-containing gas is greater than 10%, the carbon-containing liquid and the carbon-containing gas are injected simultaneously, and the actual hourly conversion rate of the carbon-containing gas is detected in real time to dynamically adjust the injection rates of the carbon-containing liquid and the carbon-containing gas, so as to realize the underground co-solidification of the carbon-containing gas and the carbon-containing liquid. If the theoretical hourly conversion rate of the carbon-containing gas is not greater than 10%, the carbon-containing liquid is injected first, and after the carbon-containing liquid is predicted to be solidified to a degree greater than 80% according to the theoretical hourly solidification rate of the carbon-containing liquid, the carbon-containing gas is injected, and the actual hourly conversion rate of the carbon-containing gas is detected in real time to dynamically adjust the injection rates of the carbon-containing liquid and the carbon-containing gas, so as to realize the underground co-solidification of the carbon-containing gas and the carbon-containing liquid.

2. The method of subsurface co-solidification of carbon-containing liquid and carbon-containing gas according to claim 1, wherein, The actual hourly conversion rate of the carbon-containing gas is calculated according to the real-time detection of the headspace gas concentration.

3. The method of subsurface co-solidification of carbon-containing liquid and carbon-containing gas of claim 1, wherein, If the theoretical hourly conversion rate of the carbon-containing gas is greater than the actual hourly conversion rate of the carbon-containing gas, the injection rate of the carbon-containing liquid is kept unchanged, and the injection rate of the carbon-containing gas is reduced; otherwise, the injection rate of the carbon-containing gas is kept unchanged, and the injection rate of the carbon-containing liquid is increased.

4. The method of subsurface co-solidification of carbon-containing liquid and carbon-containing gas of claim 1, wherein, The theoretical hourly conversion rate of the carbon-containing gas and the theoretical hourly solidification rate of the carbon-containing liquid are predicted through a pre-constructed reaction model, and the reaction model is constructed in the following manner: Under different geological conditions and reactant proportions, the co-solidification reaction of the carbon-containing liquid and the carbon-containing gas is simulated in the laboratory to obtain the solidification rate of the carbon-containing liquid and the conversion rate of the carbon-containing gas with time, and then the corresponding theoretical hourly conversion rate of the carbon-containing gas and the theoretical hourly solidification rate of the carbon-containing liquid are obtained.

5. The method of subsurface co-solidification of carbonaceous liquid and carbonaceous gas according to claim 4, wherein, During the laboratory simulation, the reactant proportion, i.e. the mass percentage of the carbon-containing gas to the carbon-containing liquid, ranges from 0 to 100%, and the geological conditions include temperature and pressure, the temperature ranges from 20°C to 100°C, and the pressure ranges from 1.6 MPa to 20 MPa.

6. The method of subsurface co-solidification of carbon-containing liquid and carbon-containing gas of claim 1 wherein, The injection mode of the carbon-containing gas is that a gas pipeline is extended below the liquid level of the underground carbon-containing liquid to inject the carbon-containing gas into the underground in the form of bubbling.

7. The method of subsurface co-solidification of carbon-containing liquid and carbon-containing gas of claim 1 wherein, The carbon-containing liquid is a liquid containing one or more carbon atoms generated by the conversion of biomass or organic waste.

8. The method of subsurface co-solidification of carbon-containing liquid and carbon- containing gas of claim 1, wherein, The carbon-containing gas is at least one of gases containing one or more carbon atoms.

9. The method of subsurface co-solidification of carbonaceous liquid and carbonaceous gas according to any one of claims 1 to 8, wherein, When the actual hourly conversion rate of the carbon-containing gas calculated based on the real-time detection of the headspace gas concentration is 0, the injection of the carbon-containing gas and the carbon-containing liquid is stopped.

10. An underground co-solidification system of carbon-containing liquid and carbon- containing gas, characterized by, The method comprises a processor for executing the underground co-solidification method of the carbon-containing liquid and the carbon-containing gas according to any one of claims 1 to 9.

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