Method and system for determining solid-phase carbon sequestration amount in alkaline solid waste liquid-phase mineralization carbon sequestration and improving method

Abstract

The invention provides a method, system and improving method for determining the solid-phase carbon sequestration amount in alkaline solid waste liquid-phase mineralization carbon sequestration, and the determining method comprises the following steps: obtaining the inlet gas carbon dioxide concentration of a bubbling bed reactor, the molar flow of carbon dioxide at an inlet, the carbon dioxide concentration at an outlet and a first duration; wherein the first duration is the duration of the conductivity of the alkaline solid waste slurry from the beginning of the reaction to the lowest point, so as to determine the solid-phase carbon sequestration amount of carbon dioxide in unit time in the bubbling bed reactor, and further determine the total solid-phase carbon sequestration amount in the bubbling bed reactor within the first duration. According to the method, the solid-phase carbon sequestration amount of the carbon dioxide is calculated, and then the reaction working condition with the maximum solid-phase carbon sequestration amount of the carbon dioxide can be selected through comparison of the calculated data, so that the solid-phase carbon sequestration amount is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid waste recycling and utilization, and in particular relates to a method, system and improvement method for determining the solid phase carbon fixation amount in liquid phase mineralization carbon fixation of alkaline solid waste. Background Art

[0002] The combustion of fossil fuels causes a large amount of CO2 gas emissions, and it is particularly important to find a reliable carbon sequestration technology. Mineralization sequestration is one of the many technologies, which has the advantage of low energy consumption. This technology uses minerals rich in metal elements such as calcium and magnesium to fix CO2, which is both safe and stable. This technology mainly has two pathways: direct mineralization carbon sequestration and indirect mineralization carbon sequestration. Among them, direct mineralization carbon sequestration technology can be divided into dry and wet pathways. The direct liquid phase mineralization carbon sequestration route is considered to be the better route due to its lower cost and simple operation.

[0003] Large amounts of alkaline solid waste are generated annually in industrial areas near large CO2 point sources. They have low to negative market prices and are highly reactive due to their unstable chemical properties. Using alkaline solid waste to fix carbon can further increase the value of waste materials, reduce the cost of waste disposal or landfill, and save valuable land. Therefore, selecting alkaline solid waste as a material for liquid-phase mineralization and carbon fixation can promote the recycling and reuse of this material. Among these alkaline solid wastes, carbide slag contains a high CaO content and has a higher carbon fixation capacity at room temperature and pressure than other solid wastes, so carbide slag is selected as a carbon fixation material.

[0004] In the bubbling bed reactor, the CO2 gas entering the reactor reacts with the carbide slag slurry. During the reaction, part of the CO2 is retained in the liquid phase in the form of molecules, and part of the CO2 is released as Some CO2 remains in the liquid phase as CaCO3 precipitates, while some remains in the solid phase as CaCO3 precipitates. Leaving more CO2 in the solid phase as CaCO3 precipitates allows for more stable CO2 storage. However, there is currently a lack of methods to determine the amount of solid-phase carbon sequestration and to determine the specific operating conditions that allow more CO2 to be stored in the solid phase. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method, system and improvement method for determining the solid phase carbon fixation amount in the liquid phase mineralization carbon fixation of alkaline solid waste.

[0006] In a first aspect, the present invention provides a method for determining the amount of solid-phase carbon sequestration in liquid-phase mineralization carbon sequestration of alkaline solid waste, comprising:

[0007] Obtaining the inlet carbon dioxide concentration, the inlet carbon dioxide molar flow rate, the outlet carbon dioxide concentration, and a first time duration of the bubbling bed reactor, wherein the first time duration is the time duration from the start of the reaction to the lowest point of the conductivity of the alkaline solid waste slurry;

[0008] The solid phase carbon sequestration amount of carbon dioxide per unit time in the bubbling bed reactor is determined according to the inlet carbon dioxide concentration of the bubbling bed reactor, the molar flow rate of the inlet carbon dioxide and the carbon dioxide concentration at the outlet;

[0009] The total solid-phase carbon fixation amount in the bubbling bed reactor during the first time period is determined according to the solid-phase carbon fixation amount of carbon dioxide per unit time.

[0010] Optionally, determining the solid-phase carbon sequestration amount of carbon dioxide per unit time in the bubbling bed reactor according to the inlet carbon dioxide concentration of the bubbling bed reactor, the molar flow rate of the inlet carbon dioxide, and the carbon dioxide concentration at the outlet includes:

[0011] The solid phase carbon fixation amount q of carbon dioxide per unit time in the bubbling bed reactor is calculated according to the following formula:

[0012]

[0013] Among them, y in is the inlet carbon dioxide concentration of the bubbling bed reactor; y out is the carbon dioxide concentration at the outlet of the bubbling bed reactor; Q in is the molar flow rate of carbon dioxide at the inlet of the bubbling bed reactor; Δt is the unit time.

[0014] Optionally, determining the total solid-phase carbon sequestration amount in the bubbling bed reactor within the first time period according to the solid-phase carbon sequestration amount of carbon dioxide per unit time comprises:

[0015] The total solid carbon fixation amount A in the bubbling bed reactor during the first time period j is calculated according to the following formula:

[0016]

[0017] Among them, q i is the solid phase carbon sequestration amount of carbon dioxide in the first time period j at the i-th second; q 0 is the concentration of carbon dioxide when the bubbling bed reactor is empty; is the relative molar mass of carbon dioxide; m CS is the total mass of alkaline solid waste.

[0018] In a second aspect, the present invention provides a system for determining the amount of solid-phase carbon sequestration in liquid-phase mineralization carbon sequestration of alkaline solid waste, comprising:

[0019] An acquisition module is used to obtain the inlet carbon dioxide concentration, the inlet carbon dioxide molar flow rate, the outlet carbon dioxide concentration and a first time length of the bubbling bed reactor, wherein the first time length is the time length from the start of the reaction to the lowest point of the conductivity of the alkaline solid waste slurry;

[0020] A first determination module is used to determine the solid phase carbon sequestration amount of carbon dioxide per unit time in the bubbling bed reactor according to the inlet carbon dioxide concentration of the bubbling bed reactor, the molar flow rate of the inlet carbon dioxide, and the carbon dioxide concentration at the outlet;

[0021] The second determining module is used to determine the total solid-phase carbon fixation amount in the bubbling bed reactor within a first time period according to the solid-phase carbon fixation amount of carbon dioxide per unit time.

[0022] Optionally, the first determining module includes:

[0023] The first calculation unit is used to calculate the solid phase carbon fixation amount q of carbon dioxide per unit time in the bubbling bed reactor according to the following formula:

[0024]

[0025] Among them, y in is the inlet carbon dioxide concentration of the bubbling bed reactor; y out is the carbon dioxide concentration at the outlet of the bubbling bed reactor; Q in is the molar flow rate of carbon dioxide at the inlet of the bubbling bed reactor; Δt is the unit time.

[0026] Optionally, the second determining module includes:

[0027] The second calculation unit is used to calculate the total solid-phase carbon fixation amount A in the bubbling bed reactor within the first time length j according to the following formula:

[0028]

[0029] Among them, q i is the solid phase carbon sequestration amount of carbon dioxide in the first time period j at the i-th second; q 0 is the concentration of carbon dioxide when the bubbling bed reactor is empty; is the relative molar mass of carbon dioxide; m CS is the total mass of alkaline solid waste.

[0030] In a third aspect, the present invention provides a method for increasing solid-phase carbon sequestration based on the method for determining solid-phase carbon sequestration in liquid-phase mineralization of alkaline solid waste described in the first aspect, comprising:

[0031] Under the condition that the gas velocity and the liquid-to-solid ratio of the alkaline solid waste slurry remain unchanged, the solid phase carbon fixation amount under different inlet carbon dioxide concentrations in the first time period is calculated. After the reaction is completed, the inlet carbon dioxide concentration corresponding to the maximum solid phase carbon fixation amount is selected as the first reaction condition;

[0032] and / or, while keeping the gas velocity and the inlet carbon dioxide concentration constant, calculating the solid-phase carbon fixation amount of the alkaline solid waste slurry at different liquid-solid ratios during the first time period, and after the reaction is completed, selecting the liquid-solid ratio corresponding to the maximum solid-phase carbon fixation amount as the second reaction condition;

[0033] and / or, while keeping the liquid-to-solid ratio of the alkaline solid waste slurry and the inlet carbon dioxide concentration unchanged, calculating the solid-phase carbon fixation amount at different gas velocities during the first time period, and after the reaction is completed, selecting the gas velocity corresponding to the maximum solid-phase carbon fixation amount as the third reaction condition;

[0034] The first reaction condition and / or the second reaction condition and / or the third reaction condition are used as the final reaction condition to increase the solid phase carbon fixation amount.

[0035] In a fourth aspect, the present invention provides a computer device comprising a processor and a memory; wherein, when the processor executes the computer program stored in the memory, the steps of the method for determining the amount of solid-phase carbon sequestration in the liquid-phase mineralization and carbon sequestration of alkaline solid waste described in the first aspect are implemented.

[0036] In a fifth aspect, the present invention provides a computer-readable storage medium for storing a computer program; when the computer program is executed by a processor, the steps of the method for determining the amount of solid-phase carbon sequestration in the liquid-phase mineralization and carbon sequestration of alkaline solid waste described in the first aspect are implemented.

[0037] In a sixth aspect, the present invention provides a computer program product comprising computer executable instructions or a computer program. When the computer executable instructions or the computer program are executed by a processor, the steps of the method for determining the amount of solid-phase carbon sequestration in the liquid-phase mineralization and carbon sequestration of alkaline solid waste described in the first aspect are implemented.

[0038] The present invention provides a method, system and improvement method for determining the solid-phase carbon fixation amount in the liquid-phase mineralization carbon fixation of alkaline solid waste, wherein the method for determining the solid-phase carbon fixation amount is based on information obtained from experiments of a bubbling bed reactor system collection and analysis system, can realize direct liquid-phase mineralization carbon fixation of alkaline solid waste at normal temperature and pressure, and can monitor important parameters in the reaction process in real time to obtain the operating values ​​of process flow, mass transfer and process parameters. The solid-phase carbon fixation amount of carbon dioxide can be calculated based on the relevant data obtained, and then by comparing the calculated data, the reaction condition with the maximum solid-phase carbon fixation amount of carbon dioxide can be selected to improve the phase carbon fixation amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic flow chart of a method for determining the amount of solid-phase carbon sequestration in liquid-phase mineralization of alkaline solid waste provided by an embodiment of the present invention;

[0041] Figure 2 The bubbling bed reactor body and internal principle diagram provided by an embodiment of the present invention;

[0042] Figure 3 A schematic structural diagram of a system for determining the amount of solid-phase carbon sequestration in liquid-phase mineralization of alkaline solid waste provided by an embodiment of the present invention;

[0043] Figure 4 A schematic flow chart of a method for increasing solid-phase carbon sequestration in liquid-phase mineralization of alkaline solid waste provided by an embodiment of the present invention;

[0044] Figure 5 A graph showing the variation of CO2 solid phase retention with liquid-solid ratio under the conditions of a gas velocity of 0.07 m / s and an inlet CO2 concentration of 20% is provided for an embodiment of the present invention;

[0045] Figure 6 A graph showing the variation of total CO2 absorption and liquid phase retention with liquid-to-solid ratio under the conditions of a gas velocity of 0.07 m / s and an inlet CO2 concentration of 20% is provided for an embodiment of the present invention;

[0046] Figure 7 The graph of the change of CO2 mass transfer rate over time at different liquid-to-solid ratios under the working conditions of gas velocity of 0.07m / s and inlet CO2 concentration of 20% provided in the embodiment of the present invention;

[0047] Figure 8 The embodiment of the present invention provides a graph showing the variation of CO2 solid phase carbon fixation with inlet CO2 concentration under the conditions of a gas velocity of 0.07 m / s and a liquid-to-solid ratio of carbide slag slurry of 10 mL / g;

[0048] Figure 9 The embodiment of the present invention provides a graph showing the change in mass transfer rate over time at different inlet CO2 concentrations under the conditions of a gas velocity of 0.07 m / s and a liquid-to-solid ratio of carbide slag slurry of 10 mL / g;

[0049] Figure 10A graph showing changes in conductivity, pH, and outlet CO2 concentration over time under an operating condition where the inlet CO2 concentration is 10% provided by an embodiment of the present invention;

[0050] Figure 11 The graph shows the changes in conductivity, pH and outlet CO2 concentration over time under the condition of an inlet CO2 concentration of 60%. DETAILED DESCRIPTION

[0051] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0052] Example 1

[0053] like Figure 1 As shown, this embodiment provides a method for determining the solid phase carbon sequestration amount in liquid phase mineralization carbon sequestration of alkaline solid waste, comprising:

[0054] Step 101, obtaining the inlet carbon dioxide concentration, the inlet carbon dioxide molar flow rate, the outlet carbon dioxide concentration and the first time length of the bubbling bed reactor, wherein the first time length is the time length from the start of the reaction to the lowest point of the conductivity of the alkaline solid waste slurry.

[0055] In this embodiment, the alkaline solid waste is the carbide slag produced by industrial production of polyvinyl chloride resin using calcium carbide, which is composed of calcium hydroxide, such as Figure 2 The bubbling bed reactor body and internal schematic diagram are shown.

[0056] The main chemical reactions in carbide slag slurry are shown in equations (1)-(5), where reaction (1) is the CO2 gas-liquid mass transfer process, reaction (2) is the dissolution and ionization of Ca(OH)2, and reactions (3)-(5) are the main ion reactions in the liquid phase.

[0057]

[0058] The main ion reaction processes 1-5 in the carbide slag slurry correspond to equations (1)-(5) respectively. The reaction processes mainly include the reaction process 1 in which the gas phase CO2 transfers into the liquid phase, the reaction process 2 in which the main reaction component Ca(OH)2 particles in the carbide slag dissolve in water and ionize, and the generation of calcium ions Ca 2+ and hydroxide ions OH - , the CO2(aq) entering the liquid phase and the OH ionized in process 2 - The reaction is reaction process 3, which generates With excess OH - Further reaction generation This process is reaction process 4, generating With Ca 2+ The nucleation and aggregation precipitation to form CaCO3(s) is the reaction process 5. Through the reaction process 5, CO2 is retained in the solid phase, which is the CO2 solid phase carbon fixation amount. The retention capacity in the main form is called liquid phase retention capacity, and the sum of solid phase carbon retention capacity and liquid phase retention capacity is the total CO2 absorption capacity.

[0059] The bubbling bed reactor itself is used to conduct and sample the direct liquid-phase mineralization and carbon fixation process of carbide slag. The reactor collects pressure pulsation signals, pH value, conductivity, and CO2 concentration at the process outlet as initial data conditions. The reactor is connected to a computer via a data acquisition card and stores the data. By controlling three key operating parameters: inlet CO2 concentration, gas velocity, and carbide slag slurry liquid-to-solid ratio, the amount of CO2 solid-phase carbon fixation, liquid-phase retention, and total absorption of the carbide slag slurry within the reactor after the reaction is complete are controlled.

[0060] Step 102 : determining the solid phase carbon sequestration amount of carbon dioxide per unit time in the bubbling bed reactor according to the inlet carbon dioxide concentration of the bubbling bed reactor, the molar flow rate of the inlet carbon dioxide, and the carbon dioxide concentration at the outlet.

[0061] Exemplarily, the solid phase carbon sequestration amount q of carbon dioxide per unit time in the bubbling bed reactor is calculated according to the following formula:

[0062]

[0063] Among them, y in is the inlet carbon dioxide concentration of the bubbling bed reactor; y out is the carbon dioxide concentration at the outlet of the bubbling bed reactor; Q in is the molar flow rate of carbon dioxide at the inlet of the bubbling bed reactor; Δt is the unit time.

[0064] Step 103 : determining the total solid-phase carbon sequestration amount in the bubbling bed reactor within the target time period according to the solid-phase carbon sequestration amount of carbon dioxide per unit time.

[0065] Exemplarily, the total solid-phase carbon fixation amount in the bubbling bed reactor during the first time period j is calculated according to the following formula:

[0066]

[0067] Where A is the total solid carbon content in the first time period j, in g / kg; q i is the solid phase carbon sequestration amount of carbon dioxide in the i-th second within the time length j; q 0is the concentration of carbon dioxide when the bubbling bed reactor is empty; is the relative molar mass of carbon dioxide; m CS is the total mass of alkaline solid waste (carbide slag).

[0068] When the reaction time range (i.e., duration) is from the start of the reaction to the lowest point of conductivity, the result is calculated as the solid phase carbon fixation amount; when the reaction time range is from the start of the reaction to the end of the reaction, the result is calculated as the total absorption of the (carbide slag) slurry.

[0069] The method for determining the amount of solid-phase carbon fixation in the liquid-phase mineralized carbon fixation of alkaline solid waste provided in this embodiment can more accurately determine the amount of solid-phase carbon fixation in the liquid-phase mineralized carbon fixation of alkaline solid waste.

[0070] Example 2

[0071] Based on the same inventive concept as Example 1, this example provides a system for determining the amount of solid-phase carbon fixation in the liquid-phase mineralized carbon fixation of alkaline solid waste. Since the principle of solving the problem by this system is similar to the method for determining the amount of solid-phase carbon fixation in the liquid-phase mineralized carbon fixation of alkaline solid waste provided in the aforementioned Example 1, the implementation of this system can refer to the implementation of the method for determining the amount of solid-phase carbon fixation in the liquid-phase mineralized carbon fixation of alkaline solid waste provided in Example 1.

[0072] like Figure 3 As shown, the system for determining the solid phase carbon sequestration amount in the liquid phase mineralization carbon sequestration of alkaline solid waste includes:

[0073] The acquisition module 10 is used to obtain the inlet carbon dioxide concentration, the molar flow rate of the inlet carbon dioxide, the carbon dioxide concentration at the outlet and the first time length of the bubbling bed reactor, wherein the first time length is the time length of the conductivity of the alkaline solid waste slurry from the start of the reaction to the lowest point.

[0074] The first determination module 20 is used to determine the solid phase carbon fixation amount of carbon dioxide per unit time in the bubbling bed reactor according to the inlet carbon dioxide concentration of the bubbling bed reactor, the molar flow rate of the inlet carbon dioxide and the carbon dioxide concentration at the outlet.

[0075] The second determining module 30 is configured to determine the total solid-phase carbon fixation amount in the bubbling bed reactor within a first time period according to the solid-phase carbon fixation amount of carbon dioxide per unit time.

[0076] Exemplarily, the first determining module includes:

[0077] The first calculation unit is used to calculate the solid phase carbon fixation amount q of carbon dioxide per unit time in the bubbling bed reactor according to the following formula:

[0078]

[0079] Among them, yin is the inlet carbon dioxide concentration of the bubbling bed reactor; y out is the carbon dioxide concentration at the outlet of the bubbling bed reactor; Q in is the molar flow rate of carbon dioxide at the inlet of the bubbling bed reactor; Δt is the unit time.

[0080] Exemplarily, the second determining module includes:

[0081] The second calculation unit is used to calculate the total solid-phase carbon fixation amount A in the bubbling bed reactor within the first time length j according to the following formula:

[0082]

[0083] Among them, q i is the solid phase carbon sequestration amount of carbon dioxide in the first time period j at the i-th second; q 0 is the concentration of carbon dioxide when the bubbling bed reactor is empty; is the relative molar mass of carbon dioxide; m CS is the total mass of alkaline solid waste.

[0084] For more specific working processes of the above modules, please refer to the corresponding content disclosed in Example 1, which will not be repeated here.

[0085] Example 3

[0086] When the liquid phase is not circulated, the reaction is only carried out once, and the carbide slag slurry after the reaction is not reused. When the liquid phase is circulated, the carbide slag slurry after the reaction is separated by liquid-solid sedimentation and then the liquid phase is reused and circulated.

[0087] When the liquid phase is not circulating, the operating parameters (liquid-to-solid ratio, CO2 concentration, and gas velocity) are adjusted to achieve the goal of trapping more CO2 in the solid phase, thereby fixing more CO2 in the form of CaCO3 precipitates. The curves of the pH value, CO2 concentration, conductivity, and other parameters of the solution obtained during the operation of the bubbling bed reactor as a function of reaction time are analyzed to determine the time interval corresponding to the reaction process. The amount of CO2 carbon fixed in the solid phase, the amount retained in the liquid phase, and the total absorption of the slurry are further calculated.

[0088] Under the operating conditions of non-circulation of the liquid phase, the operating conditions of the corresponding bubbling bed reactor device are controlled, including: liquid-to-solid ratio, inlet CO2 concentration and gas velocity, so as to achieve the purpose of sealing more CO2 in the solid phase.

[0089] The method of regulating the solid phase carbon fixation during the liquid phase mineralization process is to adjust the important operating parameters, such as the liquid-solid ratio of the carbide slag slurry and the inlet CO2 concentration, so that the pH value of the carbide slag slurry can be maintained in the range of 9-12 for a longer time, thereby promoting the carbon to The carbon dioxide exists in the liquid phase in the form of CaCO3(s), thereby generating more CaCO3(s) precipitation to increase the solid phase carbon fixation capacity.

[0090] By controlling the size of the operating parameter liquid-solid ratio, at a moderate gas velocity and a certain CO2 concentration, the liquid-solid ratio can be reduced. At this time, the liquid phase volume can be controlled to be relatively limited, and the amount of gas phase CO2 mass transfer into the liquid phase CO2 (aq) is limited. At this time, the OH generated in the reaction process (2) - The relative excess can keep the pH at 9-12 for a longer time, promote the reaction processes (4) and (5), and thus increase the solid phase carbon fixation amount.

[0091] By controlling the operating parameter of the inlet CO2 concentration, at a moderate gas velocity, reducing the inlet CO2 concentration value, the gas-liquid mass transfer rate can be effectively reduced, and through the reaction process (2), more OH - Ions accumulate, which can effectively maintain the pH at 9-12 for a longer period of time, thereby promoting the reactions (4) and (5) and increasing the amount of solid phase carbon fixation.

[0092] By controlling the gas velocity as an operating parameter, under low liquid-solid ratio conditions, increasing the gas velocity and appropriately increasing the inlet CO2 concentration can effectively increase the liquid phase turbulence intensity, promote the collision contact frequency of the reactants, increase the reactant concentration, facilitate the progress of reactions (3)-(5), and increase the solid phase carbon fixation amount.

[0093] Therefore, if Figure 4 As shown, this embodiment provides a method for increasing the solid-phase carbon sequestration amount based on the method for determining the solid-phase carbon sequestration amount in the liquid-phase mineralization carbon sequestration of alkaline solid waste described in Example 1, comprising:

[0094] Step 201, when the gas velocity and the liquid-to-solid ratio of the alkaline solid waste slurry remain unchanged, calculate the solid phase carbon fixation amount under different inlet carbon dioxide concentrations within a first time period, and after the reaction is completed, select the inlet carbon dioxide concentration corresponding to the maximum solid phase carbon fixation amount as the first reaction condition.

[0095] And / or, step 202, when the gas velocity and the inlet carbon dioxide concentration remain unchanged, the solid-phase carbon fixation amount of the alkaline solid waste slurry under different liquid-solid ratios within the first time period is calculated, and after the reaction is completed, the liquid-solid ratio corresponding to the maximum solid-phase carbon fixation amount is selected as the second reaction condition.

[0096] And / or, step 203, when the liquid-to-solid ratio of the alkaline solid waste slurry and the inlet carbon dioxide concentration remain unchanged, calculate the solid-phase carbon fixation amount at different gas velocities within the first time period, and after the reaction is completed, select the gas velocity corresponding to the maximum solid-phase carbon fixation amount as the third reaction condition.

[0097] Step 204: Using the first reaction condition and / or the second reaction condition and / or the third reaction condition as the final reaction condition to increase the solid phase carbon fixation amount.

[0098] For example, under the working conditions of an inlet CO2 concentration of 20%, a gas velocity of 0.07 m / s, and a liquid-solid ratio variation range of 5-50 mL / g (for carbide slag slurry), by adjusting the variation of the liquid-solid ratio, the slurry liquid-solid ratio at which the CO2 solid phase carbon fixation value is maximized can be found under different liquid-solid ratios. At the beginning of the reaction, the liquid-solid ratio of the slurry is different, and the amount of CO2 dissolved is different. When the liquid phase is less, the amount of CO2 dissolved is less, and OH - The amount of CO2 is relatively excessive, the slurry maintains a pH of 9-12 for a longer time, and the solid phase carbon fixation of CO2 is relatively greater. The solid phase carbon fixation of CO2, the liquid phase retention of CO2, and the total absorption capacity under different working conditions are calculated, and the optimal slurry liquid-solid ratio is selected based on the relationship between the change of CO2 mass transfer rate over time as one of the references.

[0099] As the CO2 entering the slurry reacts with ions in the slurry to form CaCO3 precipitates, the ions in the slurry decrease. During this process, the conductivity initially decreases. As the reaction proceeds, the conductivity reaches its lowest point, indicating that the reaction in the solution is approaching completion. By monitoring the CO2 inlet and outlet concentration difference every second, the per-second carbon fixation rate can be calculated. The per-second CO2 inlet and outlet concentration differences from the start of the reaction to the lowest conductivity point are summed to obtain the solid-phase carbon fixation rate of CO2. The conductivity then rebounds due to the dissolution of the CaCO3 precipitate generated by the reaction. The total CO2 uptake by the slurry is calculated by summing the CO2 inlet and outlet concentration differences at all times throughout the experiment until the reaction is complete. The liquid-phase CO2 retention is calculated by subtracting the solid-phase CO2 retention rate from the total CO2 uptake. The solid-phase CO2 retention rate and the total CO2 uptake in the slurry are then calculated to determine the liquid-phase retention rate.

[0100] For example, under the conditions that the concentration of inlet CO2 is 20%, the gas velocity is 0.07m / s, and the liquid-to-solid ratios are 5mL / g, 10mL / g, 20mL / g, 30mL / g, and 40mL / g, the following can be obtained: Figure 5 、 Figure 6 and Figure 7 . Figure 5 This is the graph showing the change of CO2 solid phase carbon sequestration with liquid-solid ratio; Figure 6 It is a graph of the liquid phase retention (absorption) of CO2 and the total absorption of CO2 by the slurry; Figure 7 The graph shows the change of CO2 mass transfer rate over time under different liquid-solid ratios. Figure 5 It can be seen that the solid phase carbon storage capacity of CO2 decreases first and then increases with the increase of liquid-solid ratio. Figure 6At a low liquid-to-solid ratio, the mass transfer rate is faster, but the CO2(aq) reserve of the slurry is small, so the pH stays at 9-12 for a longer time. Figure 5 、 Figure 6 and Figure 7 It can be seen that at a low liquid-solid ratio, the amount of solid carbon fixation is relatively large, and finally a liquid-solid ratio of 5 mL / g was selected as the optimal process condition.

[0101] Under the conditions of CO2 gas velocity of 0.07m / s, liquid-to-solid ratio of 10mL / g, and inlet CO2 concentration of 10%, 15%, 20%, 40%, 60% and 85%, the following can be obtained: Figure 8 、 Figure 9 、 Figure 10 and Figure 11 . Figure 8 is a graph showing the variation of solid phase carbon fixation with inlet CO2 concentration; Figure 9 The graph of CO2 mass transfer rate changing with time at different CO2 concentrations; Figure 10 and Figure 11 The graphs of conductivity, pH and outlet CO2 concentration changing with time at 10% and 60% inlet CO2 concentration respectively. Figure 8 It can be seen that the solid phase carbon fixation of CO2 decreases with the increase of inlet CO2 concentration, and the mass transfer rate increases with the increase of concentration; Figure 10 and Figure 11 It can be seen that at low concentrations, the pH is maintained at 9-12 for a longer time, which increases the solid phase carbon fixation of the solution. Finally, an inlet CO2 concentration of 10% is selected as the inlet CO2 concentration with the largest solid phase carbon fixation.

[0102] When the inlet gas velocity is 0.07m / s and the liquid-solid ratio is 10mL / g, different inlet CO2 concentrations are selected as candidate operating conditions. By adjusting the change in inlet CO2 concentration, the inlet CO2 concentration at which the maximum solid-phase carbon fixation of CO2 occurs at the end of the reaction can be found. At different concentrations, the gas-liquid mass transfer rate is different, the pH is at 9-12 for different times, and the solid-phase carbon fixation of CO2 is different. The solid-phase carbon fixation of CO2 at different inlet CO2 concentrations is obtained by calculation. After the reaction is completed, the reaction condition with the maximum solid-phase carbon fixation is selected based on the relationship between the gas-liquid mass transfer rate of CO2 at different concentrations and the relationship between the outlet CO2 concentration, conductivity, and pH at 10% and 60% inlet CO2 concentrations and time. The mass transfer rate increases with increasing CO2 concentration. At low inlet CO2 concentrations, OH - More accumulation can be carried out, resulting in the pH being maintained at 9-12 for a longer time at low inlet CO2 concentration, ultimately allowing more CO2 to be trapped in the solid phase.

[0103] The method for increasing solid-phase carbon sequestration provided in this embodiment selects the reaction conditions that maximize CO2 solid-phase carbon sequestration by adjusting key operating parameters. This operating condition provides guidance for the scale-up and industrial application of the bubbling bed reactor in this technology, thereby increasing solid-phase carbon sequestration through liquid-phase mineralization of carbide slag.

[0104] Example 4

[0105] This embodiment provides a computer device, including a processor and a memory; wherein, when the processor executes the computer program stored in the memory, the steps of the method for determining the amount of solid-phase carbon sequestration in the liquid-phase mineralization and carbon sequestration of alkaline solid waste described in Example 1 are implemented.

[0106] For more specific details about the above method, please refer to the corresponding content disclosed in Example 1, which will not be repeated here.

[0107] Example 5

[0108] This embodiment provides a computer-readable storage medium for storing a computer program; when the computer program is executed by a processor, the steps of the method for determining the amount of solid-phase carbon sequestration in liquid-phase mineralization and carbon sequestration of alkaline solid waste described in Example 1 are implemented.

[0109] For more specific details about the above method, please refer to the corresponding content disclosed in Example 1, which will not be repeated here.

[0110] Example 6

[0111] This embodiment provides a computer program product, including computer-executable instructions or a computer program. When the computer-executable instructions or the computer program are executed by a processor, the steps of the method for determining the amount of solid-phase carbon sequestration in the liquid-phase mineralization and carbon sequestration of alkaline solid waste described in Example 1 are implemented.

[0112] For more specific details about the above method, please refer to the corresponding content disclosed in Example 1, which will not be repeated here.

[0113] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. References to the same or similar parts between the various embodiments will be sufficient. The systems, devices, storage media, and computer program products disclosed in the embodiments correspond to the methods disclosed in the embodiments, so their descriptions are relatively simplified. For relevant details, refer to the method descriptions.

[0114] Those skilled in the art will clearly understand that the techniques in the embodiments of the present invention can be implemented using software plus a necessary general-purpose hardware platform. Based on this understanding, the technical solutions in the embodiments of the present invention, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention or certain portions of the embodiments.

[0115] In some embodiments, computer-executable instructions may be in the form of a program, software, software module, script, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.

[0116] As an example, computer-executable instructions may, but need not, correspond to a file in a file system, may be stored as part of a file that stores other programs or data, such as in one or more scripts in a HyperText Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple coordinating files (e.g., files storing one or more modules, subroutines, or code portions).

[0117] By way of example, computer-executable instructions may be deployed to be executed on one electronic device, or on multiple electronic devices located at one site, or on multiple electronic devices distributed across multiple sites and interconnected by a communication network.

[0118] The present invention has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present invention. Those skilled in the art will appreciate that various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present invention without departing from the spirit and scope of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for determining the amount of solid-phase carbon sequestration in liquid-phase mineralization of alkaline solid waste, characterized in that: include: Obtaining the inlet carbon dioxide concentration, the inlet carbon dioxide molar flow rate, the outlet carbon dioxide concentration, and a first time duration of the bubbling bed reactor, wherein the first time duration is the time duration from the start of the reaction to the lowest point of the conductivity of the alkaline solid waste slurry; The solid phase carbon sequestration amount of carbon dioxide per unit time in the bubbling bed reactor is determined according to the inlet carbon dioxide concentration of the bubbling bed reactor, the molar flow rate of the inlet carbon dioxide and the carbon dioxide concentration at the outlet; The total solid-phase carbon fixation amount in the bubbling bed reactor during the first time period is determined according to the solid-phase carbon fixation amount of carbon dioxide per unit time.

2. The method for determining the amount of solid-phase carbon sequestration in liquid-phase mineralization carbon sequestration of alkaline solid waste according to claim 1, characterized in that: The method of determining the solid-phase carbon sequestration amount of carbon dioxide per unit time in the bubbling bed reactor according to the inlet carbon dioxide concentration of the bubbling bed reactor, the molar flow rate of the inlet carbon dioxide, and the carbon dioxide concentration at the outlet includes: The solid phase carbon fixation amount q of carbon dioxide per unit time in the bubbling bed reactor is calculated according to the following formula: Among them, y in is the inlet carbon dioxide concentration of the bubbling bed reactor; y out is the carbon dioxide concentration at the outlet of the bubbling bed reactor; Q in is the molar flow rate of carbon dioxide at the inlet of the bubbling bed reactor; Δt is the unit time.

3. The method for determining the amount of solid-phase carbon sequestration in liquid-phase mineralization carbon sequestration of alkaline solid waste according to claim 1, characterized in that: The method of determining the total solid-phase carbon fixation amount in the bubbling bed reactor within the first time period according to the solid-phase carbon fixation amount of carbon dioxide per unit time comprises: The total solid carbon fixation amount A in the bubbling bed reactor during the first time period j is calculated according to the following formula: Among them, q i is the solid phase carbon sequestration amount of carbon dioxide in the first time period j at the i-th second; q 0 is the concentration of carbon dioxide when the bubbling bed reactor is empty; is the relative molar mass of carbon dioxide; m CS is the total mass of alkaline solid waste.

4. A system for determining the amount of solid-phase carbon sequestration in liquid-phase mineralization of alkaline solid waste, characterized in that: include: An acquisition module is used to obtain the inlet carbon dioxide concentration, the inlet carbon dioxide molar flow rate, the outlet carbon dioxide concentration and a first time length of the bubbling bed reactor, wherein the first time length is the time length from the start of the reaction to the lowest point of the conductivity of the alkaline solid waste slurry; A first determination module is used to determine the solid phase carbon sequestration amount of carbon dioxide per unit time in the bubbling bed reactor according to the inlet carbon dioxide concentration of the bubbling bed reactor, the molar flow rate of the inlet carbon dioxide, and the carbon dioxide concentration at the outlet; The second determining module is used to determine the total solid-phase carbon fixation amount in the bubbling bed reactor within a first time period according to the solid-phase carbon fixation amount of carbon dioxide per unit time.

5. The system for determining the amount of solid-phase carbon sequestration in liquid-phase mineralization carbon sequestration of alkaline solid waste according to claim 4, characterized in that: The first determining module includes: The first calculation unit is used to calculate the solid phase carbon fixation amount q of carbon dioxide per unit time in the bubbling bed reactor according to the following formula: Among them, y in is the inlet carbon dioxide concentration of the bubbling bed reactor; y out is the carbon dioxide concentration at the outlet of the bubbling bed reactor; Q in is the molar flow rate of carbon dioxide at the inlet of the bubbling bed reactor; Δt is the unit time.

6. The system for determining the amount of solid-phase carbon sequestration in liquid-phase mineralization carbon sequestration of alkaline solid waste according to claim 4, characterized in that: The second determining module includes: The second calculation unit is used to calculate the total solid-phase carbon fixation amount A in the bubbling bed reactor within the first time length j according to the following formula: Among them, q i is the solid phase carbon sequestration amount of carbon dioxide in the first time period j at the i-th second; q 0 is the concentration of carbon dioxide when the bubbling bed reactor is empty; is the relative molar mass of carbon dioxide; m CS is the total mass of alkaline solid waste.

7. A method for increasing solid-phase carbon sequestration based on the method for determining solid-phase carbon sequestration in liquid-phase mineralization carbon sequestration of alkaline solid waste according to any one of claims 1 to 3, characterized in that: include: Under the condition that the gas velocity and the liquid-to-solid ratio of the alkaline solid waste slurry remain unchanged, the solid phase carbon fixation amount under different inlet carbon dioxide concentrations in the first time period is calculated. After the reaction is completed, the inlet carbon dioxide concentration corresponding to the maximum solid phase carbon fixation amount is selected as the first reaction condition; and / or, while keeping the gas velocity and the inlet carbon dioxide concentration constant, calculating the solid-phase carbon fixation amount of the alkaline solid waste slurry at different liquid-solid ratios during the first time period, and after the reaction is completed, selecting the liquid-solid ratio corresponding to the maximum solid-phase carbon fixation amount as the second reaction condition; and / or, while keeping the liquid-to-solid ratio of the alkaline solid waste slurry and the inlet carbon dioxide concentration unchanged, calculating the solid-phase carbon fixation amount at different gas velocities during the first time period, and after the reaction is completed, selecting the gas velocity corresponding to the maximum solid-phase carbon fixation amount as the third reaction condition; The first reaction condition and / or the second reaction condition and / or the third reaction condition are used as the final reaction condition to increase the solid phase carbon fixation amount.

8. A computer device, characterized in that: It comprises a processor and a memory; wherein, when the processor executes the computer program stored in the memory, it implements the steps of the method for determining the solid phase carbon fixation amount in the liquid phase mineralization carbon fixation of alkaline solid waste as described in any one of claims 1 to 3.

9. A computer-readable storage medium, characterized in that Used to store computer programs; when the computer program is executed by the processor, the steps of the method for determining the solid phase carbon fixation amount in the liquid phase mineralization carbon fixation of alkaline solid waste according to any one of claims 1 to 3 are implemented.

10. A computer program product, characterized in that It includes computer-executable instructions or a computer program. When the computer-executable instructions or the computer program are executed by a processor, the steps of the method for determining the solid-phase carbon fixation amount in the liquid-phase mineralization carbon fixation of alkaline solid waste described in any one of claims 1 to 3 are implemented.

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