Carbon dioxide capture system and carbon dioxide capture method

Abstract

The present invention relates to a carbon dioxide capture system with improved energy efficiency and a carbon dioxide capture method, the carbon dioxide capture system being characterized by comprising: a carbon dioxide absorption device configured to react a first gas with ammonia water to provide a second gas containing ammonia and a first solution containing carbonate; an ammonia burner configured to burn the second gas; and a carbon dioxide regeneration device configured to separate the first solution into the ammonia water and carbon dioxide, wherein the first gas is a mixed gas of a raw material gas containing carbon dioxide and ammonia.

Description

Carbon dioxide capture system and carbon dioxide capture method

[0001] The present invention relates to a carbon dioxide capture system.

[0002] More specifically, the present invention relates to a carbon dioxide capture system using ammonia.

[0003] In addition, the present invention relates to a carbon dioxide capture method.

[0004] More specifically, the present invention relates to a method for capturing carbon dioxide using ammonia.

[0005] Carbon dioxide (CO2) is emitted in large quantities from industries that use fossil fuels, such as thermal power generation, steel, cement, and incinerators, and is being highlighted as a major cause of global warming. Accordingly, methods to reduce and mitigate carbon dioxide are being researched worldwide, and as one such study, research on carbon dioxide capture technology is actively underway.

[0006] Among such carbon dioxide capture technologies, a technology utilizing ammonia to capture carbon dioxide from industrial byproduct gases has been proposed. More specifically, when ammonia solution is injected into industrial byproduct gases, ammonium salts (NH4HCO3, (NH4)2CO3, NH2COONH4) can be formed through the reaction between the ammonia in the solution and the carbon dioxide in the industrial byproduct gases. As a result, the carbon dioxide content of the industrial byproduct gases can be reduced.

[0007] Carbon dioxide capture technology using ammonia necessarily requires a process to recover the ammonia that volatilizes downstream of the capture process. This is because if volatilizing ammonia is discharged downstream of the capture process, it can lead to problems such as environmental pollution and equipment corrosion. As an example, volatilizing ammonia can be recovered by spraying water downstream of the capture process. However, there was a problem in that regenerating the process wastewater generated after the recovery of volatilizing ammonia required a significant amount of energy, which reduced the efficiency of the capture process.

[0008] (Patent Document 1) Korean Published Patent Application No. 10-2010-0073614.

[0009] The problem that the technical concept of the present invention aims to solve is to provide a carbon dioxide capture system and a carbon dioxide capture method with improved energy efficiency.

[0010] The problems of the present invention are not limited to those described above. A person skilled in the art to which the present invention pertains will have no difficulty understanding additional problems of the present invention from the overall details of the specification.

[0011] In order to solve the technical problem of the present invention described above, a carbon dioxide capture system is provided according to exemplary embodiments. The carbon dioxide capture system comprises: a carbon dioxide absorption device configured to react a first gas with ammonia water to provide a second gas containing ammonia and a first solution containing an ammonium salt; an ammonia burner configured to burn the second gas; and a carbon dioxide regeneration device configured to separate the first solution into the ammonia water and carbon dioxide; wherein the first gas is a mixed gas of a raw gas containing carbon dioxide and ammonia.

[0012] The carbon dioxide regeneration device may be configured to heat the first solution to separate it into a third gas containing carbon dioxide and the ammonia water.

[0013] The carbon dioxide regeneration device may be configured to recover ammonia in the third gas by contacting the cleaning water provided above the first solution with the third gas, and to discharge a second solution containing the recovered ammonia.

[0014] The first solution above may be configured to exchange heat with the ammonia water regenerated from the carbon dioxide regeneration device.

[0015] The thermal energy generated from the above ammonia burner can be supplied to the above carbon dioxide regeneration device.

[0016] The carbon dioxide capture system may further include a concentration tower configured to regenerate the washing water by heating the second solution.

[0017] The above raw gas may be one or more of industrial byproduct gas, atmospheric air, and a mixture thereof.

[0018]

[0019] According to other exemplary embodiments of the present invention, a carbon dioxide capture method is provided. The carbon dioxide capture method comprises: a carbon dioxide absorption step of injecting ammonia water into a first gas mixed with a raw gas containing carbon dioxide and ammonia to produce a second gas and a first solution in which carbon dioxide is reduced relative to the first gas; a combustion step of combusting the second gas to provide a predetermined calorific value; and an ammonia water regeneration step of separating the first solution into carbon dioxide and the ammonia water.

[0020] The separation of the first solution above may be characterized by utilizing the thermal energy generated in the combustion step.

[0021] According to exemplary embodiments of the present invention, a carbon dioxide capture system with improved energy efficiency and a carbon dioxide capture method can be provided.

[0022] The various and beneficial advantages and effects of the present invention are not limited to those described above and will be more easily understood in the process of explaining specific embodiments of the present invention.

[0023] FIG. 1 is a drawing for illustrating a carbon dioxide capture system according to exemplary embodiments.

[0024] FIG. 2 is a drawing for illustrating a carbon dioxide capture system according to other exemplary embodiments.

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0026] In the following descriptions with reference to the drawings, identical or corresponding components are assigned the same reference numerals, and redundant descriptions thereof will be omitted.

[0027] In the following embodiments, the terms first, second, etc. are used not in a limiting sense, but for the purpose of distinguishing one component from another component.

[0028] In the following embodiments, the singular expression includes the plural expression unless the context clearly indicates otherwise.

[0029] In the following embodiments, terms such as "include" or "have" mean that the features or components described in the specification are present, and do not preclude the possibility that one or more other features or components may be added.

[0030] In the drawings, the size of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, so the present invention is not necessarily limited to what is illustrated.

[0031] Where an embodiment can be implemented differently, a specific process sequence may be performed differently from the order described. For example, two processes described consecutively may be performed substantially simultaneously or proceed in the reverse order of the description.

[0032] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0033] The present invention will be described in detail below through each embodiment. It should be noted that each embodiment described in this specification is not limited to a single embodiment but may also be combined with other embodiments. Accordingly, the citation of claims in the patent claims is merely an example of an embodiment, and the technical concept of the present invention should not be interpreted as being limited only to a combination with the cited claims; rather, combinations with various claims are also included within the scope of the technical concept of the present invention.

[0034] The present invention will be described in detail below through examples. However, it should be noted that the following examples are intended merely to illustrate and embody the present invention and are not intended to limit the scope of the present invention. This is because the scope of the present invention is determined by the matters described in the patent claims and matters reasonably inferred therefrom.

[0035]

[0036] [Carbon Dioxide Capture System]

[0037] FIG. 1 is a drawing for illustrating a carbon dioxide capture system (10) according to exemplary embodiments.

[0038] Referring to FIG. 1, a carbon dioxide capture system (10) according to exemplary embodiments includes a carbon dioxide absorption device (100), an ammonia burner (200), and a carbon dioxide regeneration device (300).

[0039] The carbon dioxide absorption device (100) may be configured to react a first gas with ammonia water to provide a second gas containing ammonia and a first solution containing carbonates. According to exemplary embodiments of the present invention, the second gas can be recycled without excessive energy and facility investment to recover all the ammonia in the second gas. As a result, the resource efficiency and energy efficiency of the carbon dioxide capture system (10) can be effectively improved. However, the technical concept of the present invention does not completely exclude the recovery of ammonia in the second gas. That is, considering the calorific value of the second gas required in the ammonia burner (200) or the possibility of nitrogen oxide generation, some of the ammonia in the second gas can be recovered to control the ammonia content in the second gas. Importantly, an excessive amount of process water is not introduced for ammonia recovery, and ammonia slip in the carbon dioxide absorption device (100) is allowed.

[0040] The carbon dioxide absorption device (100) may have a predetermined space capable of reacting the first gas and the ammonia water. As long as the first gas and the ammonia water can properly come into contact within the carbon dioxide absorption device (100), the form of supply of the first gas and the ammonia water is not particularly limited. As one example, the first gas may be supplied to the lower part of the carbon dioxide absorption device (100). The ammonia water may be supplied to the upper part of the carbon dioxide absorption device (100). In this case, when the first gas and the ammonia water are supplied to the carbon dioxide absorption device (100), the first gas moving to the upper part of the carbon dioxide absorption device (100) and the ammonia water moving to the lower part come into contact with each other in a countercurrent manner, and the carbon dioxide in the first gas may be stored in the form of ammonium carbonate. As a result, a first solution containing carbonate may be produced. In the present invention, carbonate encompasses all salts containing carbonic acid among the salts formed by the reaction of carbon dioxide and ammonia, such as carbonate (CO3 2- ), bicarbonate (HCO3 - ), and carbamate salts (NH2COO - ...is included but not limited thereto. In this case, the carbon dioxide absorption may follow one or more of the following reaction schemes. However, the present invention is not limited thereto, and the carbon dioxide absorption reaction is not particularly limited as long as ammonia and carbon dioxide can be combined and transported in a liquid form.

[0041] [Reaction Equation 1]

[0042] NH3 + H2O + CO2 → NH4HCO3

[0043] [Reaction Equation 2]

[0044] 2NH3 + CO2 + H2O → (NH4)2CO3

[0045] [Reaction Equation 3]

[0046] 2NH3 + CO2 → NH2COONH4

[0047] The second gas generated in the carbon dioxide absorption device (100) can be supplied to the downstream ammonia burner (200). To this end, the carbon dioxide absorption device (100) can be fluidly connected to the ammonia burner (200). The first solution generated in the carbon dioxide absorption device (100) can be supplied to the carbon dioxide regeneration device (300). To this end, the carbon dioxide absorption device (100) can be fluidly connected to the carbon dioxide regeneration device (300). In the present invention, the statement that any two members are fluidly connected means that, unless specifically defined otherwise, fluids are connected so that fluids can move between the two members in one direction or in both directions by means of a conventional fluid connection means (e.g., a pipeline, a valve, or a damper, etc.).

[0048] The first gas comprises a raw gas containing carbon dioxide and ammonia. The first gas may be provided by mixing ammonia with the raw gas. More specifically, the first gas may be provided at the downstream end of the raw gas flow line by supplying gaseous ammonia to the flow line of the raw gas. To this end, the carbon dioxide capture system (10) may be equipped with a liquid ammonia storage tank and a suitable pipeline system, but is not particularly limited. Importantly, the raw gas is not supplied directly to the carbon dioxide absorption device (100), but is supplied to the carbon dioxide absorption device (100) after being mixed with ammonia. This increases the efficiency of carbon dioxide capture.

[0049] The raw gas is not specifically limited as long as it contains carbon dioxide; however, as a non-limiting example, it may be any one of industrial byproduct gas, atmospheric air, or a mixture thereof. Industrial byproduct gas refers to a gas generated by chemical reactions in industrial facilities, specifically from one or more facilities among power generation facilities, steel manufacturing facilities, and petrochemical facilities. In this way, environmentally friendly fuel can be provided by removing carbon dioxide from atmospheric air and industrial byproduct gas. In particular, when using industrial byproduct gas, since it may contain a large amount of hydrocarbons, it can contribute to improving the heat output of the ammonia burner.

[0050] According to exemplary embodiments, the ammonia content of the first gas may be 1 to 30% in volume%.

[0051] If the ammonia content in the first gas becomes excessively high, the ammonia content in the second gas may also become excessively high, and a large amount of nitrogen oxides may be generated during the combustion process of the second gas. To prevent this, it is necessary to control the ammonia content of the first gas as described above. In this regard, more preferably, the ammonia content of the first gas may be 25% or less in volume%. More specifically, the ammonia content of the first gas may be 20% or less in volume%.

[0052] Meanwhile, as described below, the second gas is used as fuel for the ammonia burner (200). The lower the ammonia content in the second gas, the more difficult it may be to secure a sufficient calorific value when the second gas is burned. Therefore, the lower limit of the ammonia content in the first gas can be appropriately selected by considering the calorific value targeted by the ammonia burner (200), the supply amount of ammonia water provided to the carbon dioxide absorption device (100), etc. As a non-limiting example, the ammonia content in the first gas may be 1% or more.

[0053] The ammonia content of the ammonia water may be 5% or more in mass%. According to exemplary embodiments, since a certain amount of ammonia is contained in the first gas, ammonia water with a relatively low purity and low ammonia content may be used. That is, various ammonia waters may be used without being limited to the ammonia content. As a result, the resource efficiency of the carbon dioxide capture system (10) can be improved, and economic efficiency can be improved by using relatively inexpensive raw materials. However, if the ammonia content of the ammonia water is less than 5%, the carbon dioxide absorption efficiency may be reduced, and the ammonia content in the second gas may be lowered, which may reduce the calorific value of the second gas.

[0054] The upper limit of the ammonia content in the ammonia water is not specifically limited, but as a non-limiting example, it may be 30% or less.

[0055] The second gas is a gas from which carbon dioxide has been reduced from the first gas. Carbon dioxide is a thermodynamically very stable element and is already in a completely oxidized state, so no further combustion reaction occurs. In contrast, ammonia can generate sufficient thermal energy through a combustion reaction. According to exemplary embodiments, the carbon dioxide of the first gas can be reduced, and at the same time, it can be provided to a subsequent ammonia burner (200) in a state containing ammonia.

[0056] As a non-limiting example, the ammonia content of the second gas may be 1% or more by volume. As the ammonia content in the second gas increases, the calorific value generated when the second gas is combusted can be increased. Therefore, in terms of calorific value, it is desirable for the ammonia content in the second gas to be higher. However, if the ammonia content in the second gas is excessively high, an excessive amount of nitrogen oxides, such as nitric oxide, may be generated. Therefore, the ammonia content of the second gas may be 50% or less.

[0057] According to exemplary embodiments, the calorific value of the second gas is 1000 kcal / Nm 3 It may be more than that. In this way, the carbon dioxide capture system (10) can capture carbon dioxide from atmospheric air and industrial byproduct gas while simultaneously providing an eco-friendly fuel with sufficient calorific value. While it is preferable for the calorific value of the second gas to be higher, as a non-limiting example, the calorific value of the second gas is 4000 kcal / Nm 3 It may be less than.

[0058] The ammonia burner (200) may be configured to burn a second gas. The ammonia burner (200) may provide a certain amount of thermal energy by burning the second gas using air. The ammonia burner (200) may include a nozzle for spraying the second gas and an air nozzle. The structure of the ammonia burner (200) is not particularly limited as long as it can burn the second gas. Thus, according to exemplary embodiments, the second gas can be utilized as fuel for the burner, thereby increasing the energy and resource efficiency of the carbon dioxide capture system (10).

[0059] According to exemplary embodiments, thermal energy generated in the ammonia burner (200) can be supplied to the carbon dioxide regeneration device (300). As a result, the carbon dioxide capture system (10) can generate heat on its own, thereby improving the energy efficiency of the carbon dioxide capture system. The transfer of thermal energy from the ammonia burner (200) to the carbon dioxide regeneration device (300) may be achieved using steam or the like, but is not limited thereto.

[0060] The carbon dioxide regeneration device (300) can be configured to separate the first solution into ammonia water and carbon dioxide. As a result, high-purity carbon dioxide can be obtained, and the regenerated carbon dioxide can be utilized in various industrial fields.

[0061] According to exemplary embodiments, the carbon dioxide regeneration device (300) may be configured to heat a first solution to separate it into a third gas containing carbon dioxide and ammonia water. The first solution is an ammonium salt and a carbonate (CO3 2- ) or, bicarbonate (HCO3 - ), carbamate salt (NH2COO - It may include ). These maintain a combined state within the first solution and are supplied to the carbon dioxide regeneration device (300), after which, as the ammonium carbonate (or ammonium bicarbonate, carbamate salt) in the first solution is heated, they can be separated into ammonia water and carbon dioxide. As a result, the carbon dioxide capture system (10) according to exemplary embodiments can concentrate carbon dioxide in the atmosphere and regenerate it into high-concentration carbon dioxide. Additionally, according to exemplary embodiments, the ammonia water separated from the carbon dioxide regeneration device (300) can be circulated to the carbon dioxide absorption device (100). As a result, the ammonia water demand of the carbon dioxide absorption device (100) can be met to some extent or entirely. In this way, the carbon dioxide capture system (10) can improve resource efficiency by recycling resources within the system.

[0062] The heating temperature of the first solution is not particularly limited as long as the first solution can be separated into ammonia water and a third gas, but as a non-limiting example, it may be 60 to 100°C.

[0063] As a non-limiting example, the carbon dioxide regeneration device (300) may further include a reboiler configured to supply thermal energy for heating the first solution. However, the present invention is not limited thereto, and the heating means is not particularly limited as long as it can supply sufficient thermal energy to separate the first solution into the carbon dioxide regeneration device (300).

[0064] The ammonia water discharged from the carbon dioxide regeneration device (300) may contain some of the thermal energy applied for the separation of the first solution. According to exemplary embodiments, the first solution discharged from the carbon dioxide absorption device (100) may be configured to exchange heat with the ammonia water regenerated from the carbon dioxide regeneration device (300). As a result, at least some of the thermal energy required for the separation of the first solution can be obtained, thereby increasing the energy efficiency of the carbon dioxide regeneration device (300).

[0065] According to exemplary embodiments, the carbon dioxide regeneration device (300) may be configured to recover ammonia in the third gas by contacting a cleaning water provided above the first solution with a third gas, and to discharge a second solution containing the recovered ammonia. To this end, the carbon dioxide regeneration device (300) may include a first solution inlet (310) and a cleaning water inlet (320) positioned above the first solution inlet (310). The first solution inlet (310) and the cleaning water inlet (320) may be positioned on the side wall of the carbon dioxide regeneration device (300). A first solution discharged from the carbon dioxide absorption device (100) may be supplied to the carbon dioxide regeneration device (300) through the first solution inlet (310).

[0066] The carbon dioxide regeneration device (300) may include a cleaning water tray (330) at the top. The cleaning water tray (330) may be positioned between the first solution inlet (310) and the cleaning water inlet (320). The cleaning water tray (330) may be configured to restrict the cleaning water from flowing downward and to allow only the upward flow of the third gas. As a result, some cleaning water remains on the upper surface of the cleaning water tray (330), and the ammonia in the third gas can be absorbed into the cleaning water as the third gas flows upward through the carbon dioxide regeneration device (300) and comes into contact with the cleaning water. As long as such fluid behavior is allowed, the structure of the cleaning water tray (330) is not particularly limited, but as a non-limiting example, the cleaning water tray (330) may be one or more of a bubble cap tray, a perforated plate tray, a valve tray, a packed bed, and a combination thereof.

[0067] FIG. 2 is a drawing for illustrating a carbon dioxide capture system (20) according to other exemplary embodiments.

[0068] Referring to FIG. 2, a carbon dioxide capture system (20) according to exemplary embodiments may further include a concentration tower (400) configured to heat a second solution to provide regenerated water. According to exemplary embodiments, the supply of washing water to prevent ammonia slip in the carbon dioxide capture device (100) may be omitted. As a result, the capacity to be regenerated in the concentration tower (400) can be reduced, thereby saving energy consumed in the concentration tower (400).

[0069] According to exemplary embodiments, ammonia gas can be formed by heating the second solution. Furthermore, the washing water can be regenerated. At this time, the formed ammonia gas can be circulated to the carbon dioxide regeneration device (300). As a result, the ammonia content in the ammonia water discharged from the carbon dioxide regeneration device (300) can be increased, and consequently, the heat content of the second gas can be increased, thereby providing higher thermal energy to the ammonia burner (200). In addition, the regenerated washing water can be reused by circulating it to the carbon dioxide regeneration device (300), thereby increasing the resource efficiency of the carbon dioxide capture system (20).

[0070] The heating temperature of the second solution is not particularly limited as long as the second solution can be separated into ammonia water and a third gas, but as a non-limiting example, it may be 80 to 110°C.

[0071] As a non-limiting example, the concentration tower (400) may further include a reboiler configured to supply thermal energy for heating the second solution. However, the present invention is not limited thereto, and the heating means is not particularly limited as long as sufficient thermal energy can be supplied to separate the first solution into the concentration tower (400). As one example, thermal energy may be received from an ammonia burner (200).

[0072] [Carbon Dioxide Capture Methods]

[0073] A carbon dioxide capture method according to exemplary embodiments comprises: a carbon dioxide absorption step of injecting ammonia water into a first gas mixed with a raw gas containing carbon dioxide and ammonia to produce a second gas and a first solution in which carbon dioxide is reduced relative to the first gas; a combustion step of combusting the second gas to provide a predetermined calorific value; and an ammonia water regeneration step of separating the first solution into carbon dioxide and the ammonia water. As a result, carbon dioxide in the atmosphere can be effectively captured. Since the second gas generated after carbon dioxide capture can be directly utilized, energy required for ammonia recovery and process wastewater regeneration can be saved.

[0074] According to exemplary embodiments, the separation of the first solution may utilize thermal energy generated in the combustion step. That is, the first solution can be separated into carbon dioxide and ammonia water by heating it using the thermal energy generated in the combustion step. This allows for the provision of a carbon dioxide capture method with improved energy efficiency.

[0075] According to exemplary embodiments, the source gas may be any one of industrial byproduct gas, atmospheric air, and a mixture thereof.

[0076] Furthermore, as matters overlapping with carbon dioxide capture systems can be equally applied to this carbon dioxide capture method, a detailed explanation is omitted.

[0077] [Test Example]

[0078] Test Example 1: Second Gas Calorific Value Test

[0079] Whether the second gas according to exemplary embodiments can be utilized as an ammonia burner was determined by calculating the calorific value using the composition of the gas.

[0080] The calorific value of the raw materials was the theoretical calorific value based on the composition of each gas.

[0081] Table 1 shows the calorific value of a general industrial byproduct gas and the calorific value of a second gas containing ammonia.

[0082] Classification Industrial By-product Gas (Volume %) Secondary Gas (Volume %) CO2 5.23 0.80 CO2 21.12.59 N2 49.66 0.6 H2 3.74.52 O2 0.4 0.49 CH4 0.0 0.0 NH3 0.0 1.0 Calorific Value (kcal / Nm²) 3 )8551,078

[0083] Referring to Table 1, it can be seen that compared to industrial byproduct gas, carbon dioxide is reduced and the calorific value of the second gas containing ammonia is increased.

[0084]

[0085] Test Example 2: Energy Reduction Experiment

[0086] As Experimental Example 1, a carbon dioxide capture system comprising a carbon dioxide absorption device, a carbon dioxide regeneration device, and a concentration tower was assumed. At this time, the condition was set so that wash water for ammonia recovery is introduced only in the carbon dioxide regeneration device, and the process wastewater (second solution) from which ammonia has been recovered is supplied to the concentration tower. At this time, it was assumed that the thermal energy required for the carbon dioxide regeneration device and the concentration tower is supplied via steam.

[0087] The amount of washing water consumed in the carbon dioxide regeneration device, the steam consumed in the carbon dioxide regeneration device and the concentration tower, and the energy consumed are as shown in Table 2 below.

[0088] As Comparative Experimental Example 1, a carbon dioxide capture system identical to Experimental Example 1 was assumed, in addition to introducing washing water for ammonia recovery into the carbon dioxide absorption device to obtain process wastewater.

[0089] The amount of wash water consumed in the carbon dioxide absorption device and carbon dioxide regeneration device, the steam consumed in the carbon dioxide regeneration device and concentration tower, and the energy consumed are as shown in Table 2 below.

[0090] Classification Existing Process Ammonia Enrichment Process Washing Water Consumption (kg / hr) Carbon Dioxide Absorption Unit 16000 Carbon Dioxide Regeneration Unit 800800 Steam Consumption (kg / hr) Carbon Dioxide Regeneration Unit 300300 Concentration Tower 375250 Energy Consumption (GJ / tCO2) Carbon Dioxide Regeneration Unit 1.391.39 Concentration Tower 1.741.16 Total Energy Consumption (GJ / tCO2) 3.142.56

[0091] Referring to Table 2, energy consumed in the carbon dioxide capture system can be saved by minimizing or omitting the washing water in the carbon dioxide absorption device.

[0092]

[0093] Although the invention has been described with reference to the above embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as described in the following claims.

[0094] [Explanation of the symbol]

[0095] 10,20: Carbon dioxide capture system

[0096] 100: Carbon dioxide absorption device

[0097] 200: Ammonia burner

[0098] 300: Carbon Dioxide Regeneration Unit

[0099] 400: Concentration tower

Claims

1. A carbon dioxide absorption device configured to react a first gas with ammonia water to provide a second gas containing ammonia and a first solution containing carbonate; An ammonia burner configured to burn the above second gas; and A carbon dioxide regeneration device configured to separate the first solution into a third gas containing carbon dioxide and the ammonia water; comprising A carbon dioxide capture system characterized in that the first gas is a mixture of a raw gas containing carbon dioxide and ammonia.

2. In Paragraph 1, The above carbon dioxide regeneration device is, A carbon dioxide capture system configured to heat the first solution to separate it into a third gas containing carbon dioxide and the ammonia water.

3. In Paragraph 2, The above carbon dioxide regeneration device is, A carbon dioxide capture system configured to recover ammonia in the third gas by contacting the cleaning water provided above the first solution with the third gas, and to discharge a second solution containing the recovered ammonia.

4. In Paragraph 3, The above carbon dioxide capture system is, A carbon dioxide capture system further comprising a concentration tower configured to regenerate the washing water by heating the second solution.

5. In Paragraph 2, The above first solution is a carbon dioxide capture system configured to exchange heat with ammonia water regenerated from the carbon dioxide regeneration device.

6. In Paragraph 2, A carbon dioxide capture system in which the thermal energy generated from the above ammonia burner is supplied to the above carbon dioxide regeneration device.

7. In Paragraph 1, The above raw gas is a carbon dioxide capture system in which one or more of industrial byproduct gas, atmospheric air, and a mixture of these gases.

8. A carbon dioxide absorption step of injecting water with ammonia into a first gas mixed with a raw gas containing carbon dioxide and ammonia to produce a second gas and a first solution in which carbon dioxide is reduced relative to the first gas; A combustion step of combusting the above second gas to provide a predetermined calorific value; and A carbon dioxide capture method comprising: an ammonia water regeneration step of separating the first solution into carbon dioxide and the ammonia water.

9. In Paragraph 8, A carbon dioxide capture method characterized by using thermal energy generated in the combustion step for the separation of the first solution.

10. In Paragraph 8, The above-mentioned raw gas is a carbon dioxide capture method in which one or more of industrial byproduct gas, atmospheric air, and a mixture of these gases.

Images