Double-effect less-water decarburization solvent for gas turbine flue gas carbon capture

Abstract

The invention discloses a double-effect less-water decarburization solvent for gas turbine flue gas carbon capture, the solvent comprises a multi-element organic alcohol amine, a physical solvent, an antioxidant, a corrosion inhibitor, a viscosity modifier and demineralized water, and the multi-element organic alcohol amine comprises an absorbent and an auxiliary agent. According to the invention, through synergistic compounding of the preferable high-performance chemical absorbent and the physical solvent, the water content in the solvent is reduced, and the composite absorbent with the performance characteristics of low water content, high CO2 capture amount, low loss, low regeneration heat consumption and the like is formed; an efficient, economical and reliable solution is provided for reducing the whole life cycle cost of gas turbine carbon capture, and the method has a remarkable industrial application prospect.

Description

Technical Field

[0001] This invention relates to the field of chemical absorption carbon capture technology, and more particularly to a dual-effect low-water decarbonization solvent for carbon capture of gas turbine flue gas. Background Technology

[0002] With the advancement of global carbon neutrality goals, the carbon emissions from gas turbines, as a relatively clean fossil energy source, are receiving increasing attention. Chemical absorption carbon capture technology, targeting coal / gas turbine flue gas with large volumetric flow rates and low CO2 concentrations, offers advantages such as high removal efficiency and strong process adaptability, making it a commercially viable post-combustion carbon capture technology. However, gas turbine flue gas is characterized by low CO2 concentrations (typically 3%-5%), high oxygen content (15%-17%), and large flow fluctuations, placing more stringent requirements on carbon capture absorption solvents. Currently widely used alkanolamine solvents, such as ethanolamine (MEA), suffer from high regeneration energy consumption, large latent heat of vaporization, and easy degradation in high-oxygen environments; while N-methyldiethanolamine (MDEA) solvents have drawbacks such as slow absorption rates.

[0003] Patent CN116272262A uses tertiary amines as the main component, initiates the reaction with primary amines, and combines sterically hindered amines as compatibilizers to develop a ternary mixed amine absorbent with greater absorption capacity and lower regeneration heat consumption. However, this patent only considers performance indicators such as CO2 absorption capacity and desorption rate, and does not quantitatively analyze performance indicators such as degradation rate and regeneration heat consumption of the absorbent.

[0004] Patent CN109758871A provides a novel low-water binary compound decarbonization solvent for absorbing CO2. This patent uses diethylenetriamine, triethylenetetraamine, and tetraethylenepentamine, which contain multiple amino groups, as the main components. Although the absorption capacity is greatly increased, the desorption effect of these organic amines is very poor, and the desorption temperature required is higher than that of traditional MEA.

[0005] Patent CN116272262A discloses a ternary composite amine absorbent with a tertiary amine as the main component, a primary amine as a promoter, and a sterically hindered amine as a compatibilizer, which features large absorption capacity, fast absorption rate, and high desorption efficiency. However, this patent only considers the absorption-regeneration performance indicators of the composite amine absorbent and does not actually solve the problems faced by the absorbent during long-term operation, such as degradation loss, equipment corrosion, and solution foaming.

[0006] Piperazine (PZ), a cyclic diamine, exhibits superior performance due to its rapid absorption rate and high CO2 loading capacity. However, traditional piperazine solutions still face challenges such as the high heat of vaporization of water limiting regeneration heat consumption and its tendency to crystallize at low temperatures.

[0007] Sulfolane, as a physical solvent, has been used in fields such as natural gas desulfurization. It features high stability, extremely low volatility, and a certain degree of physical solubility in acidic gases. Introducing sulfolane into a chemical absorption system is expected to reduce the system's water content, thereby significantly reducing the energy consumption for water vapor evaporation during the regeneration process.

[0008] Therefore, developing a dual-effect low-water decarbonization solvent with piperazine as the main chemical solvent and sulfolane as the physical solvent can achieve excellent performance with high absorption rate, low degradation rate and low regeneration heat consumption, which is the key to breaking through the energy consumption bottleneck of gas turbine flue gas carbon capture. Summary of the Invention

[0009] This invention aims to address the challenges faced by existing chemical absorption carbon capture technology when applied to gas turbine flue gas carbon capture projects, such as high O2 content, low CO2 content, and high flue gas velocity, which lead to large absorbent degradation losses and high system regeneration heat consumption. This invention proposes a dual-effect low-water decarbonization solvent for gas turbine flue gas carbon capture.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0011] A dual-effect low-water decarbonization solvent for carbon capture in gas turbine flue gas, the solvent comprising: polyolamine, physical solvent, antioxidant, corrosion inhibitor, viscosity modifier, and demineralized water, wherein the polyolamine includes absorbent and auxiliary agent.

[0012] As a further improvement of the present invention, the components of the decarbonization solvent are as follows by mass ratio: absorbent: 20%~25%; auxiliary agent: 5%~10%; physical solvent: 30%~50%; antioxidant: 0.1%~0.2%; corrosion inhibitor: 0.05%~0.2%; viscosity modifier: 1.0%~3.0%; the remainder is demineralized water.

[0013] As a further improvement of the present invention, the absorbent is piperazine (PZ).

[0014] The auxiliary agent is one or more of N-methyldiethanolamine (MDEA), triethanolamine (TEA), and 2-amino-2-methyl-1-propanol (AMP);

[0015] The physical solvent is sulfolane;

[0016] The antioxidant is one or more of sodium sulfite (Na2SO3), hydroquinone (HQ), and phenyl-α-naphthylamine (PANA);

[0017] The corrosion inhibitor is one or more of sodium tungstate, sodium dihydrogen phosphate, sodium silicate, and sodium molybdate;

[0018] The viscosity modifier is ethylene glycol monobutyl ether.

[0019] As a further improvement to the present invention, the manufacturing process of the dual-effect low-water decarbonization solvent is as follows:

[0020] (1) First, heat the demineralized water to above 50°C, then add the absorbent piperazine (PZ) into it and continue stirring. This temperature control and stirring condition can significantly accelerate the dissolution rate of PZ crystals and improve the preparation efficiency of decarbonization solvent.

[0021] (2) After PZ has basically dissolved (the solution is clear and the degree of dissolution exceeds 80%), add liquid auxiliary agent while stirring continuously. The auxiliary agent is easy to mix because of its liquid form and can quickly form a homogeneous phase with the PZ solution.

[0022] (3) After the absorbent and the auxiliary agent are completely dissolved, add the physical solvent sulfolane and keep stirring to ensure that it is fully dispersed in the system;

[0023] (4) Add antioxidant, corrosion inhibitor and viscosity modifier in sequence, and stir continuously until all components are completely dispersed and dissolved to obtain the final decarbonization solvent product.

[0024] Compared with the prior art, the technical effects of the present invention are as follows:

[0025] 1. The present invention provides a dual-effect low-water decarbonization solvent for gas turbine flue gas carbon capture, which is a chemical solvent mainly composed of piperazine and a physical solvent composed of sulfolane. It can achieve excellent performance with high absorption rate, low degradation rate and low regeneration heat consumption, and becomes the key to breaking through the energy consumption bottleneck of gas turbine flue gas carbon capture.

[0026] 2. A dual-effect low-water decarbonization solvent for gas turbine flue gas carbon capture, through the synergistic compounding of a selected high-performance chemical absorbent and a physical solvent, reduces the water content in the solvent, forming a composite absorbent with performance characteristics such as "low water content, high CO2 capture capacity, low loss and low regeneration heat consumption", providing an efficient, economical and reliable solution for reducing the whole life cycle cost of gas turbine carbon capture, and has significant industrial application prospects. Detailed Implementation

[0027] The technical solution of the present invention will be further described below with reference to the embodiments.

[0028] A dual-effect low-water decarbonization solvent for carbon capture in gas turbine flue gas, the solvent comprising: polyolamine, physical solvent, antioxidant, corrosion inhibitor, viscosity modifier, and demineralized water, wherein the polyolamine includes absorbent and auxiliary agent.

[0029] The components of the decarbonization solvent are as follows by mass ratio: absorbent: 20%~25%; auxiliary agent: 5%~10%; physical solvent: 30%~50%; antioxidant: 0.1%~0.2%; corrosion inhibitor: 0.05%~0.2%; viscosity modifier: 1.0%~3.0%; the remainder is demineralized water.

[0030] The absorbent is piperazine (PZ), characterized by low loss, high CO2 capture capacity, and low regeneration heat consumption. The auxiliary agent is one or more of N-methyldiethanolamine (MDEA), triethanolamine (TEA), and 2-amino-2-methyl-1-propanol (AMP), which can further reduce the regeneration heat consumption of the decarbonization solvent. The physical solvent is sulfolane, which can reduce regeneration heat consumption by at least 15%. The antioxidant is one or more of sodium sulfite (Na2SO3), hydroquinone (HQ), and phenyl-α-naphthylamine (PANA). The corrosion inhibitor is one or more of sodium tungstate, sodium dihydrogen phosphate, sodium silicate, and sodium molybdate. The viscosity modifier is ethylene glycol monobutyl ether.

[0031] The manufacturing process of this dual-effect low-water decarbonization solvent is as follows:

[0032] (1) First, heat the demineralized water to above 50°C, then add the absorbent piperazine (PZ) and continue stirring. This temperature control and stirring condition can significantly accelerate the dissolution rate of PZ white crystals and improve the preparation efficiency of decarbonization solvent.

[0033] (2) After PZ has basically dissolved (the solution is clear and the degree of dissolution exceeds 80%), add liquid auxiliary agent while stirring continuously. The auxiliary agent is easy to mix because of its liquid form and can quickly form a homogeneous phase with the PZ solution.

[0034] (3) After the absorbent and the auxiliary agent are completely dissolved, add the physical solvent sulfolane and keep stirring to ensure that it is fully dispersed in the system;

[0035] (4) Add antioxidant, corrosion inhibitor and viscosity modifier in sequence, and stir continuously until all components are completely dispersed and dissolved to obtain the final decarbonization solvent product.

[0036] Example 1: Solvent viscosity

[0037] In the process of carbon capture of gas turbine flue gas, the viscosity of the carbon capture solvent affects material transport, heat exchange, and gas-liquid mass transfer. This study investigated the viscosity variation of a dual-effect low-water decarbonization solvent provided by this invention by preparing two blank samples and eight examples of carbon capture solvents.

[0038]

[0039] Table 1. Viscosity test results of dual-effect low-water decarbonization solvent

[0040] serial number <![CDATA[Viscosity (mm 2 / s)]]> Blank Sample 1 7.7 Blank Sample 2 7.4 1# Solvent 7.9 2# Solvent 9.8 3# Solvent 12.6 4# Solvent 34.7 5# Solvent 12.4 6# Solvent 12.3 7# Solvent 12.1 8# Solvent 12.0

[0041] The deionized water content of blank sample 1, blank sample 2, and solvent #1 was 75%, and the corresponding viscosity test results were similar.

[0042] Solvents #2 and #3 are based on solvent #1, with sulfolane replacing 25% and 50% of the demineralized water, respectively, resulting in a corresponding increase in solvent viscosity to 9.8 mm. 2 / s, 12.6mm 2 The viscosity remains low overall, which will not adversely affect the material transport, heat exchange, and gas-liquid mass transfer of the carbon capture system. This indicates that the viscosity of the dual-effect low-water decarbonization solvent provided by this invention meets the requirements for use as a carbon capture solvent for gas turbine flue gas.

[0043] Solvent #4 completely replaces the demineralized water with sulfolane, resulting in a significant increase in solvent viscosity to 34.7 mm. 2 / s, this viscosity value exceeds the acceptable range for the carbon capture system, indicating that the anhydrous decarbonization solvent system is not suitable.

[0044] Solvents #5, #6, #7, and #8 were formulated based on solvent #3, with different proportions of ethylene glycol monobutyl ether added to reduce the viscosity of the decarbonization solvent. Test results showed that compared to solvent #3, the viscosities of solvents #5, #6, #7, and #8 decreased by 1.59%, 2.38%, 3.97%, and 4.76%, respectively, indicating that ethylene glycol monobutyl ether, as a viscosity modifier, effectively reduces solvent viscosity. An addition ratio of 1% to 3% showed the best results and is recommended.

[0045] Example 2: Dissolved oxygen content

[0046] Due to the high oxygen content in gas turbine flue gas, the decarbonization solvent tends to undergo oxidative degradation during the absorption-regeneration stage of carbon capture. By reducing the dissolved oxygen content in the decarbonization solvent, the oxidative degradation rate of the solvent in the regeneration process (under high-temperature conditions) can be effectively reduced.

[0047] Oxygenation experiments were conducted on three solvents (1#, 2#, and 3#) under different gas flow rates (1.0 m / s, 1.5 m / s, 2.0 m / s, and 2.5 m / s) to investigate the changes in dissolved oxygen content in the three decarbonization solvents.

[0048] Test results show that the relationship between gas flow rate and dissolved oxygen content in the decarbonization solvent is as follows: in the low flow rate range (1.0 m / s to 2.0 m / s), the dissolved oxygen content increases significantly with increasing flow rate; when the flow rate exceeds a certain critical value (>2.0 m / s), the dissolved oxygen content will decrease due to insufficient contact time or flooding.

[0049] A comparison of three decarbonization solvents (solvent #1, solvent #2, and solvent #3) revealed that as the water content in the solvent decreased, the dissolved oxygen content also gradually decreased. For example, when the gas flow rate was 1.5 m / s, the dissolved oxygen content of solvent #2 was 5.7 mg / L, a decrease of 21.9% compared to solvent #1; the dissolved oxygen content of solvent #3 was 3.4 mg / L, a decrease of 53.4% ​​compared to solvent #1. This indicates that the dual-effect low-water decarbonization solvent provided by this invention can reduce dissolved oxygen content and effectively alleviate the oxidative degradation rate in the regeneration process (under high-temperature conditions).

[0050] Example 3: Gas Entrainment Loss

[0051] The losses of carbon capture and decarbonization solvents in gas turbine flue gas mainly include gas entrainment losses and degradation losses. By detecting the concentration of organic amines entrained in the outlet gas, the volatility of organic amines in the decarbonization solvent can be assessed, and the corresponding gas entrainment losses of the decarbonization solvent can be determined.

[0052] The concentration of organic amines in the outlet flue gas was tested under different gas flow rates by configuring two blank samples and two embodiment carbon capture solvents. (A gas washing device and a demister were configured at the outlet.)

[0053] project Solvent components Blank Sample 3 30% MEA + 70% demineralized water Blank Sample 4 30% MDEA + 70% demineralized water 9# Solvent 25% PZ + 5% MDEA + 70% Demineralized Water 10# solvent 25% PZ + 5% TEA + 45% Sulfolane + 25% Demineralized Water

[0054] Test results show that the concentration of organic amines in the outlet gas corresponding to the decarbonization solvent is directly proportional to the gas flow rate. That is, as the gas flow rate increases, the concentration of organic amines in the outlet gas also gradually increases, and the gas entrainment loss increases. Reasons: (1) When the gas flow rate is too high, the drag force exerted by the gas on the liquid will increase, which will enhance the entrainment effect; (2) Increasing the gas flow rate will reduce the gas film resistance of the gas-liquid contact and increase the mass transfer rate of organic amines.

[0055] Blank sample 3 uses MEA as the absorbent. Due to the small molecular weight, low boiling point and high saturated vapor pressure of MEA, its volatility is enhanced. Therefore, the concentration of organic amines entrained in the outlet gas is relatively large. For example, if the gas flow rate is 1.0 m / s, the loss of organic amines entrained is 21 mg / L.

[0056] Blank sample 4 uses MDEA as the absorbent. Due to the large molecular weight and high boiling point of MDEA, its volatility is low, and the concentration of organic amines entrained in the outlet gas is low. For example, if the gas flow rate is 1.0 m / s, the loss of organic amines entrained is 12 mg / L.

[0057] Solvents #9 and #10 use PZ as the absorbent and MDEA and TEA as auxiliary agents. Since PZ's molecular weight, boiling point, and saturated vapor pressure are between those of MEA and MDEA, its volatility is higher than MDEA but lower than MEA. However, due to the gas washing device and demister at the absorber outlet, the ring structure of PZ gives it extremely high solubility in water, effectively and significantly reducing the volatilization loss of organic amines, achieving a level as low as MDEA. For example, at a gas flow rate of 1.0 m / s, the entrainment loss of organic amines is only 10 mg / L and 11 mg / L, respectively. This demonstrates that the dual-effect low-water decarbonization solvent provided by this invention has low gas entrainment loss.

[0058] Example 4: Absorption-Regeneration Loss

[0059] This study investigated the organic amine loss rate of a dual-effect, low-water decarbonization solvent for gas turbine flue gas carbon capture, as provided in this invention, by conducting an absorption-regeneration continuous cycle experiment. The degradation rate changes of the decarbonization solvent were tested and compared by preparing two blank samples and five examples of decarbonization solvents.

[0060] Experimental conditions: The gas source was a mixture of 50% CO2 and 50% O2, the gas flow rate was 3 L / min, the experimental time was 72 h, and the absorption end temperature was set to 40℃ and the regeneration end temperature was set to 120℃.

[0061]

[0062] Table 4. Degradation rate data of seven decarbonization solvents in absorption-regeneration cycle test.

[0063] serial number Degradation rate (%) Blank Sample 1 25.3% Blank Sample 2 18.9% 1# Solvent 11.4% 3# Solvent 10.2% 11# solvent 9.3% 12# solvent 10.3% 13# Solvent 9.4%

[0064] Compared to the degradation rates of blank sample 1 and blank sample 2, which were 25.3% and 18.9% respectively, the degradation rate of solvent #1 was only 11.4%, indicating that PZ as an absorbent has a lower degradation rate and more stable physicochemical properties.

[0065] Solvent #3 is based on solvent #1, but with 50% sulfolane replaced in the demineralized water. Compared to solvent #1, the degradation rate of solvent #3 decreased to 10.2%. The reason for this is that replacing the demineralized water with sulfolane reduces the dissolved oxygen content in the decarbonization solvent, thus alleviating the oxidative degradation rate in the regeneration process.

[0066] Solvents #11, #12, and #13 were based on solvent #3, with the addition of three antioxidants: hydroquinone (HQ), sodium metavanadate, and sodium sulfite (Na₂SO₃), to reduce the oxidation rate of the decarbonization solvent. Test results showed that the degradation rates of solvents #11, #12, and #13 were 9.3%, 10.3%, and 9.4%, respectively. Compared to solvent #3, the degradation rates of solvents #11 and #13 were lower, indicating that the two antioxidants (HQ and Na₂SO₃) had a certain inhibitory effect on oxidation. However, the degradation rate of solvent #12 did not decrease, indicating that the antioxidant (sodium metavanadate) did not achieve its intended effect.

[0067] Example 5: Net Solvent Loading

[0068] This invention provides a dual-effect, low-water decarbonization solvent for carbon capture in gas turbine flue gas. CO2 absorption-desorption performance experiments were conducted under the same conditions, obtaining the CO2 absorption load, desorption load, and net load of five solvents at atmospheric pressure (0.1 MPa). The CO2 loading of the solvents was tested using the constant volume method.

[0069] Among them, the absorption load can quantitatively characterize the absorption rate of CO2 by the decarbonization solvent. The larger the absorption load, the faster the solvent absorbs CO2 and the better the absorption performance.

[0070] Desorption load can reflect the desorption effect of the decarbonization solvent. The smaller the desorption load, the more complete the desorption of CO2 from the solvent.

[0071] Net loading is the difference between the absorption load and desorption load of the decarbonization solvent, and it is an important indicator for evaluating the absorption-desorption performance of the decarbonization solvent. Generally, the larger the net loading, the better the absorption-desorption performance of the decarbonization solvent, and the lower the corresponding heat consumption for CO2 capture and regeneration.

[0072]

[0073] Table 5. CO2 loading in absorption-regeneration experiments of eight decarbonization solvents.

[0074] solvent Absorbed loading (mol / mol) Desorption loading (mol / mol) Net loading (mol / mol) <![CDATA[CO2 capture amount (g / L)]]> Blank Sample 1 0.24 0.08 0.16 28.9 Blank Sample 2 0.32 0.08 0.24 24.0 1# Solvent 0.35 0.09 0.26 33.3 2# Solvent 0.35 0.09 0.26 33.3 3# Solvent 0.37 0.1 0.27 34.5 14# Solvent 0.31 0.09 0.22 29.9 15# solvent 0.36 0.07 0.29 35.1 16# solvent 0.36 0.08 0.28 35.9

[0075] The results showed that under normal pressure of 0.1 MPa, the CO2 capture amounts of blank sample 1 and blank sample 2 were 28.9 g / L and 24.0 g / L, respectively, and the CO2 capture amount of solvent 1 was 33.3 g / L. This indicates that PZ, as an absorbent, has the advantages of fast absorption rate and good regeneration effect, and can significantly improve the CO2 capture amount.

[0076] Solvents #2 and #3 are based on solvent #1, with sulfolane replacing 25% and 50% of the demineralized water, respectively. The corresponding CO2 capture amounts are 33.3 g / L and 34.5 g / L, respectively, indicating that using the physical solvent sulfolane can improve the CO2 capture amount and form a chemical-physical dual absorption effect.

[0077] Solvents #14, #15, and #16 were based on solvent #3, with 5% PZ replaced by MEA, MDEA, and AMP, respectively. The results showed that the CO2 capture capacity of solvent #14 was 29.9 g / L, indicating that the MEA replacement was ineffective and negatively impacted PZ CO2 capture. The CO2 capture capacities of solvents #15 and #16 were 35.1 g / L and 35.9 g / L, respectively, demonstrating that the MDEA and AMP auxiliaries provided by this invention have a positive impact on PZ solvent CO2 capture, thus improving solvent absorption-desorption performance.

[0078] Example 6: Regeneration Heat Consumption

[0079] This invention provides a dual-effect low-water decarbonization solvent for gas turbine flue gas carbon capture. The regeneration heat consumption of the decarbonization solvent was tested on a 2000-ton / year gas turbine flue gas carbon capture unit.

[0080] Table 6. Inlet flue gas parameters of a 2000-ton / year gas turbine flue gas carbon capture unit

[0081] project parameter flue gas volume <![CDATA[6500Nm 3 / h]]> <![CDATA[CO2]]> 3.2% <![CDATA[O2]]> 14.2% <![CDATA[N2]]> 75.2% <![CDATA[H2O]]> 7.4% dust concentration <![CDATA[≤1mg / Nm 3 ]]> <![CDATA[SO2 concentration]]> <![CDATA[≤5mg / Nm 3 ]]> <![CDATA[NO x Concentration <![CDATA[≤5mg / Nm 3 ]]> temperature 90℃ (wash temperature reduced to 40℃) pressure 4 kPa

[0082] Table 7 Operating parameters of a 2000-ton / year flue gas carbon capture unit

[0083] project parameter Carbon capture solvent volume (t) 23t absorbent circulation rate <![CDATA[13~15m 3 / h]]> Total amine concentration 25% Absorption temperature (°C) 39℃ Regeneration temperature (°C) 110℃ runtime 25d

[0084] Example 6 The eight decarbonization solvents prepared include:

[0085]

[0086] Table 8. Regeneration heat consumption data for decarbonization solvent test

[0087] Solvent sample <![CDATA[Regeneration heat consumption (GJ / tCO2)]]> Blank Sample 1 4.07 Blank Sample 2 3.93 1# Solvent 3.73 3# Solvent 3.34 17# Solvent 3.13 18# solvent 3.11 19# Solvent 3.11 20# solvent 3.10

[0088] In this embodiment, the regeneration heat consumption of blank sample 1 and blank sample 2 are 4.07 GJ / tCO2 and 3.93 GJ / tCO2, respectively.

[0089] (1) The regeneration heat consumption of solvent #1 is 3.73 GJ / tCO2, which is lower than that of blank sample 1 and blank sample 2. This indicates that the present invention provides a dual-effect low-water decarbonization solvent for carbon capture of gas turbine flue gas. The selected organic amine PZ has a lower regeneration heat consumption than MEA and MDEA.

[0090] (2) The regeneration heat consumption of solvent #3 is 3.34 GJ / tCO2, which is 10.46% lower than that of solvent #1. This shows that the use of sulfolane to partially replace the demineralized water can achieve the effect of reducing the regeneration heat consumption, which fully proves the feasibility of low-water decarbonization solvent.

[0091] (3) The regeneration heat consumption of solvents 17, 18, 19 and 20 is 3.13 GJ / tCO2, 3.11 GJ / tCO2, 3.11 GJ / tCO2 and 3.10 GJ / tCO2, respectively, which is lower than that of solvent 3. This indicates that adding a small amount of MDEA, AMP and TEA to the PZ system can further reduce the regeneration heat consumption.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A dual-effect low-water decarbonization solvent for carbon capture in gas turbine flue gas, characterized in that, The solvent includes: polyolamines, physical solvents, antioxidants, corrosion inhibitors, viscosity modifiers, and demineralized water, wherein the polyolamines include absorbents and auxiliary agents.

2. The dual-effect low-water decarbonization solvent for carbon capture in gas turbine flue gas according to claim 1, characterized in that, The components of the decarbonization solvent, by mass ratio, are: absorbent: 20%~25%; auxiliary agent: 5%~10%; physical solvent: 30%~50%; antioxidant: 0.1%~0.2%. Corrosion inhibitor: 0.05% ~ 0.2%; viscosity modifier: 1.0% ~ 3.0%; the remainder is demineralized water.

3. The dual-effect low-water decarbonization solvent for carbon capture in gas turbine flue gas according to claim 2, characterized in that, The absorbent is piperazine (PZ); The auxiliary agent is one or more of N-methyldiethanolamine (MDEA), triethanolamine (TEA), and 2-amino-2-methyl-1-propanol (AMP); The physical solvent is sulfolane; The antioxidant is one or more of sodium sulfite (Na2SO3), hydroquinone (HQ), and phenyl-α-naphthylamine (PANA); The corrosion inhibitor is one or more of sodium tungstate, sodium dihydrogen phosphate, sodium silicate, and sodium molybdate; The viscosity modifier is ethylene glycol monobutyl ether.

4. The dual-effect low-water decarbonization solvent for carbon capture in gas turbine flue gas according to claim 3, characterized in that, The manufacturing process of this dual-effect low-water decarbonization solvent is as follows: (1) First heat the demineralized water to above 50°C, then add the absorbent piperazine (PZ) and stir continuously; (2) After PZ has basically dissolved, add liquid additives while stirring continuously; (3) After the absorbent and the auxiliary agent are completely dissolved, add the physical solvent sulfolane and keep stirring to ensure that it is fully dispersed in the system; (4) Add antioxidant, corrosion inhibitor and viscosity modifier in sequence, and stir continuously until all components are completely dispersed and dissolved to obtain the final decarbonization solvent product.

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