Carbon dioxide capture method

Abstract

The invention provides a carbon dioxide trapping method, a carbon dioxide trapping system is adopted, the carbon dioxide trapping system comprises a flue gas pretreatment device, a safety gas pretreatment device and a carbon dioxide separation device, and the flue gas pretreatment device comprises a flue gas pretreatment fixing seat and a flue gas pretreatment module; the safety gas pretreatment device comprises a safety gas pretreatment fixing seat and a safety gas pretreatment module; the carbon dioxide separation device comprises a carbon dioxide separation fixing seat and a carbon dioxide separation module; and the flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module are spliced and connected through respective correspondingly arranged fixing seats. The carbon dioxide trapping method disclosed by the invention has the characteristics of standardization, economy, high efficiency, high flexibility, small size, compactness, stability, reliability and high trapping effect.

Description

Technical Field

[0001] The invention belongs to the field of carbon dioxide separation and relates to a carbon dioxide capture method. Background Art

[0002] Under the severe situation of global warming, the industrial sector (such as electricity, chemicals, steel, cement, transportation, etc.), as one of the important sources of carbon emissions, is facing tremendous pressure to reduce emissions.

[0003] However, most of the existing carbon dioxide capture devices are customized for a single carbon source, which not only increases the design difficulty and production and operation costs of the equipment, but is also not conducive to replacement of usage scenarios and recycling, and is not conducive to the formation of a standardized industrial chain.

[0004] In addition, the existing carbon dioxide capture system has not fully considered practical problems such as large changes in incoming flue gas flow, limited space, and difficulty in integration with existing systems, which greatly limits its widespread application in different industrial fields.

[0005] Therefore, it is necessary to provide a method for capturing carbon dioxide. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a carbon dioxide capture method to solve the application limitation problem of the carbon dioxide capture method in the prior art.

[0007] To achieve the above-mentioned object and other related objects, the present invention provides a carbon dioxide capture method, which comprises:

[0008] Provided are a flue gas pretreatment device, a safety gas pretreatment device and a carbon dioxide separation device, wherein the flue gas pretreatment device comprises a flue gas pretreatment fixing seat and a flue gas pretreatment module arranged on the flue gas pretreatment fixing seat; the safety gas pretreatment device comprises a safety gas pretreatment fixing seat and a safety gas pretreatment module arranged on the safety gas pretreatment fixing seat; the carbon dioxide separation device comprises a carbon dioxide separation fixing seat and a carbon dioxide separation module arranged on the carbon dioxide separation fixing seat;

[0009] The flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module are assembled and connected through the flue gas pretreatment fixing seat, the safety gas pretreatment fixing seat and the carbon dioxide separation fixing seat to form a carbon dioxide capture system;

[0010] The flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module are started in sequence to capture carbon dioxide.

[0011] Optionally, the carbon dioxide capture system also includes a carbon dioxide storage device, which includes a carbon dioxide storage fixing seat and a carbon dioxide storage module arranged on the carbon dioxide storage fixing seat, and the flue gas pretreatment module, the safety gas pretreatment module, the carbon dioxide separation module and the carbon dioxide storage module are assembled and connected through their respective corresponding fixing seats.

[0012] Optionally, each mount has a container size, including 20 feet, 40 feet or 45 feet.

[0013] Optionally, each module in the flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module includes self-series connection and / or self-parallel connection.

[0014] Optionally, each module in the flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module is connected in series and / or in parallel to form a carbon dioxide capture block, and the carbon dioxide capture system includes M>1 carbon dioxide capture blocks connected in parallel.

[0015] Optionally, the flue gas pretreatment module includes a tail gas washing unit, a cooling unit, a dust removal unit, a desulfurization unit and a denitrification unit; and / or the safety gas pretreatment module includes a first gas-liquid separation unit, a first buffer unit, a compression unit, a cooling unit, a second gas-liquid separation unit, a filtering unit, a second buffer unit and a heating unit; the corresponding units in each module include self-series connection and / or self-parallel connection; the selected number of each unit includes 0 to 100.

[0016] Optionally, the flue gas pretreatment module further includes a waste heat recovery unit arranged corresponding to the cooling unit; the safety gas pretreatment module further includes a waste heat recovery unit arranged corresponding to the cooling unit and / or a waste heat utilization unit arranged corresponding to the heating unit.

[0017] Optionally, the carbon dioxide separation module includes one or a combination of a carbon dioxide chemical adsorption separation module, a carbon dioxide physical adsorption separation module, a carbon dioxide membrane separation module and a carbon dioxide cryogenic distillation module; the carbon dioxide membrane separation module includes a membrane separation unit, a vacuum unit and a buffer unit; each unit includes self-series connection and / or self-parallel connection, and the selected number of each unit includes 0 to 100.

[0018] Optionally, a shock absorbing unit is provided between each module and the corresponding fixed seat; and / or a shock absorbing unit is provided between the corresponding fixed seat and the base in each device; wherein the shock absorbing unit includes a shock absorbing rubber pad or a spring shock absorber.

[0019] Optionally, a switching unit, a monitoring unit and a controller that communicate with each other are also provided, wherein the monitoring unit includes one or a combination of a pressure monitoring unit, a temperature monitoring unit, a flow monitoring unit and a purity monitoring unit, and the communication method includes one or a combination of wired communication and wireless communication.

[0020] Optionally, the carbon dioxide capture method is applicable to the capture of stationary carbon dioxide emission sources or mobile carbon dioxide emission sources.

[0021] As described above, the carbon dioxide capture method of the present invention has the carbon dioxide capture system, and the carbon dioxide capture system includes the flue gas pretreatment device, the safety gas pretreatment device and the carbon dioxide separation device, wherein the flue gas pretreatment device includes a flue gas pretreatment fixing seat and a flue gas pretreatment module arranged on the flue gas pretreatment fixing seat; the safety gas pretreatment device includes a safety gas pretreatment fixing seat and a safety gas pretreatment module arranged on the safety gas pretreatment fixing seat; the carbon dioxide separation device includes a carbon dioxide separation fixing seat and a carbon dioxide separation module arranged on the carbon dioxide separation fixing seat; and the flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module are assembled and connected through the fixing seats corresponding to each other.

[0022] Furthermore, the carbon dioxide capture system may also include the carbon dioxide storage device, and the carbon dioxide storage device includes the carbon dioxide storage fixing seat and a carbon dioxide storage module arranged on the carbon dioxide storage fixing seat, and the flue gas pretreatment module, the safety gas pretreatment module, the carbon dioxide separation module and the carbon dioxide storage module are assembled and connected through their respective corresponding fixing seats.

[0023] The carbon dioxide capture method of the present invention assembles and connects the flue gas pretreatment device, the safety gas pretreatment device, the carbon dioxide separation device and the carbon dioxide storage device, which can make carbon dioxide capture more flexible and efficient and expand the scope of application scenarios; allows users to flexibly increase or decrease, adjust the sequence and set up series and parallel connections of each device according to the specific conditions of the actual incoming gas, thereby improving the working efficiency of the equipment; can facilitate the flexible disassembly, assembly, maintenance and adjustment of each device in different application scenarios, and reduce industrial production costs in the long run, and facilitate the formation of a processing industry chain; the pipeline connections between the devices are convenient, and the combined disassembly and assembly are efficient, which can greatly improve the carbon dioxide capture efficiency and provide a more efficient engineering operation idea for flexible capture in specific scenarios; each module can achieve a stable connection with the base.

[0024] The carbon dioxide capture method of the present invention has the characteristics of standardization, economic efficiency, high flexibility, small size, compactness, stability, reliability and high capture effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Shown is a schematic diagram of the structural distribution of the carbon dioxide capture system in Example 1 of the present invention.

[0026] Figure 2a to Figure 2c It shows a connection diagram of three different carbon dioxide membrane separation modules corresponding to the first embodiment of the present invention.

[0027] Figure 3 It shows a schematic diagram of the structural distribution of the carbon dioxide capture system in the second embodiment of the present invention.

[0028] Figure 4 Shown is a schematic diagram of the structural distribution of a carbon dioxide capture block in Example 2 of the present invention.

[0029] Figure 5 Shown is a process flow chart of the carbon dioxide capture method in Example 3 of the present invention.

[0030] Description of Reference Numerals

[0031] 100 Flue gas pretreatment device

[0032] 101 Exhaust Gas Scrubber Unit

[0033] 102 Cooling unit

[0034] 103 Dust removal unit

[0035] 104 Desulfurization Unit

[0036] 105 Denitrification Unit

[0037] 106 Waste Heat Recovery Unit

[0038] 200 Safety gas pre-treatment device

[0039] 201 The first gas-liquid separation unit

[0040] 202 First buffer unit

[0041] 203 Compression Unit

[0042] 204 Cooling unit

[0043] 205 Second gas-liquid separation unit

[0044] 206 Filter unit

[0045] 207 Second buffer unit

[0046] 208 Heating unit

[0047] 209 Waste Heat Recovery Unit

[0048] 210 Waste Heat Utilization Unit

[0049] 300 Carbon dioxide separation unit

[0050] 310 Carbon dioxide chemical adsorption separation module

[0051] 311 Amino Adsorption Separation Module

[0052] 312 Metal-organic framework material adsorption and separation module

[0053] 313 Ionic Liquid Adsorption Separation Module

[0054] 320 Carbon dioxide physical adsorption separation module

[0055] 321 Activated carbon adsorption separation module

[0056] 322 Zeolite molecular sieve adsorption separation module

[0057] 330 Carbon dioxide membrane separation module

[0058] 331 Membrane separation unit

[0059] 332 Vacuum unit

[0060] 333 Buffer unit

[0061] 340 Carbon dioxide cryogenic distillation module

[0062] 400 Carbon dioxide storage device

[0063] 500 Auxiliary Modules

[0064] 600 Base support DETAILED DESCRIPTION

[0065] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0066] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0067] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0068] Embodiment 1

[0069] See also Figure 1 The present embodiment provides a carbon dioxide capture system, which includes a flue gas pretreatment device 100, a safety gas pretreatment device 200, a carbon dioxide separation device 300 and a carbon dioxide storage device 400; wherein, the flue gas pretreatment device 100 includes a flue gas pretreatment fixing seat (not shown) and a flue gas pretreatment module arranged on the flue gas pretreatment fixing seat; the safety gas pretreatment device 200 includes a safety gas pretreatment fixing seat (not shown) and a safety gas pretreatment module arranged on the safety gas pretreatment fixing seat; the carbon dioxide separation device 300 includes a carbon dioxide separation fixing seat (not shown) and a carbon dioxide separation module arranged on the carbon dioxide separation fixing seat; the carbon dioxide storage device 400 includes a carbon dioxide storage fixing seat (not shown) and a carbon dioxide storage module arranged on the carbon dioxide storage fixing seat; and the flue gas pretreatment module, the safety gas pretreatment module, the carbon dioxide separation module and the carbon dioxide storage module are assembled and connected through the fixing seats corresponding to each other.

[0070] In this embodiment, the modular setting of the flue gas pretreatment module can be realized through the flue gas pretreatment fixing seat, the modular setting of the safety gas pretreatment module can be realized through the safety gas pretreatment fixing seat, the modular setting of the carbon dioxide separation module can be realized through the carbon dioxide separation fixing seat, and the modular setting of the carbon dioxide storage module can be realized through the carbon dioxide storage fixing seat, thereby realizing flexible, efficient and compact assembly connection and system layout, and can flexibly disassemble and combine devices according to the actual flue gas emissions, spatial layout and operating conditions of different application scenarios, so as to facilitate installation and application in different application scenarios, and can conveniently upgrade or maintain a single device without affecting the operation of the entire system.

[0071] It should be noted that in another embodiment, the carbon dioxide storage device 400 may not be modularly configured, and no excessive limitation is made here.

[0072] As an example, the carbon dioxide capture system may be applicable to a stationary carbon dioxide emission source or a mobile carbon dioxide emission source.

[0073] Specifically, for different carbon dioxide emission sources, the carbon dioxide capture system in this embodiment is connected through modular assembly and can be applicable to fixed carbon dioxide emission sources, such as industrial emissions from coal-fired power plants, cement plants, steel mills, etc., as well as mobile carbon dioxide emission sources such as ship exhaust, to achieve carbon dioxide emission reduction needs.

[0074] As an example, preferably each fixing seat has a container size, and the container size preferably includes 20 feet, 40 feet or 45 feet, that is, the flue gas pretreatment fixing seat, the safety gas pretreatment fixing seat, the carbon dioxide separation fixing seat and the carbon dioxide storage fixing seat may all have a container size, wherein the container size may include, for example, 20 feet, 40 feet or 45 feet.

[0075] Specifically, when the flue gas pretreatment fixing seat, the safety gas pretreatment fixing seat, the carbon dioxide separation fixing seat and the carbon dioxide storage fixing seat are set to have standard sizes, it can facilitate the assembly and disassembly of the various devices, and it is easy to install on a base with standard sizes. In particular, when each fixing seat adopts a container size, a "container-type" complete process flow can be formed to adapt to flexible disassembly, assembly, maintenance, adjustment, transportation, application, etc. in different application scenarios. For example, if it is applied to the field of ships, it can reduce industrial production costs in the long run and promote the formation of a processing industry chain.

[0076] Among them, no excessive restrictions are made here regarding the specific size settings of the flue gas pretreatment fixing seat, the safety gas pretreatment fixing seat, the carbon dioxide separation fixing seat and the carbon dioxide storage fixing seat.

[0077] As an example, the flue gas pretreatment module may include an exhaust gas washing unit 101, a cooling unit 102, a dust removal unit 103, a desulfurization unit 104 and a denitrification unit 105; the safety gas pretreatment module may include a first gas-liquid separation unit 201, a first buffer unit 202, a compression unit 203, a cooling unit 204, a second gas-liquid separation unit 205, a filtering unit 206, a second buffer unit 207 and a heating unit 208.

[0078] Furthermore, the flue gas pretreatment module may also include a waste heat recovery unit 106 arranged corresponding to the cooling unit 102; the safety gas pretreatment module may also include a waste heat recovery unit 209 arranged corresponding to the cooling unit 204 and / or a waste heat utilization unit 210 arranged corresponding to the heating unit 208.

[0079] Specifically, Figure 1In this embodiment, the flue gas pretreatment module includes 6 process units: the tail gas washing unit 101, the cooling unit 102, the dust removal unit 103, the desulfurization unit 104, the denitrification unit 105 and the waste heat recovery unit 106.

[0080] Furthermore, in the flue gas pretreatment module, the selected number of each unit may include 0 to 100, such as each unit may be 0, 5, 10, 20, 50, 100, etc., and each unit may be connected in series and / or in parallel, wherein the waste heat recovery unit 106 is arranged corresponding to the cooling unit 102, which may be one-to-one correspondence, or multiple cooling units 102 correspond to one waste heat recovery unit 106.

[0081] Among them, the tail gas washing unit 101 is intended to remove the main impurity components in the incoming flue gas, adjust the flue gas properties, and prevent particulate matter from clogging pipes and other components. For example: when the incoming gas contains more acidic gases, a certain specific detergent solution can be used in the tail gas washing link to remove some acidic gases and soluble impurities in the flue gas by spraying, etc., and can be combined with structures such as coarse filtration, medium filtration and fine filtration to effectively remove large particles of dust, fine dust and tiny particles of impurities in the incoming flue gas such as ships, etc., to prevent impurities such as particles and dust from blocking or damaging subsequent process flows. The cooling unit 102 is intended to reduce the temperature of the incoming gas, reduce the evaporation of water, and avoid excessively high temperature flue gas affecting the service life of equipment and accessories such as pipes and valves. For example: an efficient air-cooled or water-cooled heat exchanger can be used to cool the high-temperature flue gas to a suitable temperature to facilitate subsequent dust removal operations. The dust removal unit 103 is intended to ensure the removal of fine dust particles in the flue gas, and a combination of multi-stage electrostatic dust removal and bag dust removal can be considered, but it is not limited to this. The desulfurization unit 104 and the denitrification unit 105 are used to remove acidic gases and nitrogen oxides in the incoming gas in a targeted manner to avoid rapid corrosion of equipment and pipelines. For example, when the incoming gas contains high sulfur and nitrogen components, desulfurization and denitrification processes can be enabled, such as "wet desulfurization", using alkaline absorbents to react with sulfur dioxide to generate stable sulfate products, thereby reducing the sulfur content in the flue gas, and then through selective catalytic reduction (SCR) technology, nitrogen oxides are converted into harmless nitrogen and water under the action of catalysts. The waste heat recovery unit 106 is set corresponding to the cooling unit 102, and the heat released by the cooling unit 102 can be recovered to further save energy and reduce costs.

[0082] like Figure 1In this embodiment, the safety gas pretreatment module includes a total of 10 process units: the first gas-liquid separation unit 201, the first buffer unit 202, the compression unit 203, the cooling unit 204, the second gas-liquid separation unit 205, the filtering unit 206, the second buffer unit 207, the heating unit 208, the waste heat recovery unit 209 and the waste heat utilization unit 210.

[0083] Furthermore, in the safety air pretreatment module, the selected number of each unit may include 0 to 100, such as each unit may be 0, 5, 10, 20, 50, 100, etc., and each unit may be connected by self-series and / or self-parallel, wherein the waste heat recovery unit 209 is set corresponding to the cooling unit 204, which may be one-to-one correspondence, or multiple cooling units 204 correspond to one waste heat recovery unit 209; the waste heat utilization unit 210 is set corresponding to the heating unit 208, which may be one-to-one correspondence, or multiple heating units 208 correspond to one waste heat utilization unit 210.

[0084] Among them, the first gas-liquid separation unit 201 can initially separate gas and liquid impurities, and the separated gas can enter the subsequent processing process. The liquid impurities will be regularly released to the designated recovery tank (not shown) through the external exhaust pipe (not shown). The first buffer unit 202 plays a role in stabilizing the gas flow pressure and flow. The compression unit 203 is intended to increase the gas pressure to meet the requirements of carbon dioxide separation, and a multi-stage compressor can be considered. The cooling unit 204 can reduce the gas temperature again through a heat exchanger to improve the subsequent carbon dioxide separation efficiency. The second gas-liquid separation unit 205 can further remove liquid water droplets in the gas. The filtering unit 206 is intended to remove tiny particle impurities, and a high-precision filter can be considered. The second buffer unit 207 can stabilize the pressure again. The heating unit 208 can use electric heating, etc. to properly heat the gas as needed to prevent gas condensation or degradation of the separation device performance due to low temperature during the carbon dioxide separation process. The waste heat recovery unit 209 is set corresponding to the cooling unit 204, so the heat released by the cooling unit 204 can be recovered to further save energy and reduce costs; similarly, the waste heat utilization unit 210 is set corresponding to the heating unit 208, so the heat can be reused to further save energy and reduce costs.

[0085] As an example, in the carbon dioxide separation module, the carbon dioxide separation module may include one or a combination of a carbon dioxide chemical adsorption separation module 310 , a carbon dioxide physical adsorption separation module 320 , a carbon dioxide membrane separation module 330 or a carbon dioxide cryogenic distillation module 340 .

[0086] Specifically, Figure 1 According to the requirements, the carbon dioxide separation module may include one or a combination of the carbon dioxide chemical adsorption separation module 310, the carbon dioxide physical adsorption separation module 320, the carbon dioxide membrane separation module 330 or the carbon dioxide cryogenic distillation module 340. The carbon dioxide chemical adsorption separation module 310 may include, for example, an amino adsorption separation module 311, a metal organic framework material adsorption separation module 312, an ionic liquid adsorption separation module 313, etc.; the carbon dioxide physical adsorption separation module 320 may include, for example, an activated carbon adsorption separation module 321, a zeolite molecular sieve adsorption separation module 322, etc.

[0087] As an example, the carbon dioxide separation module may include a membrane separation unit 331 , a vacuum unit 332 , and a buffer unit 333 .

[0088] Furthermore, in the carbon dioxide separation module, the number of each unit can include 0 to 100, such as 0, 5, 10, 20, 50, 100, etc., and each unit can be connected in series and / or in parallel.

[0089] See also Figure 2a to Figure 2c In this embodiment, the carbon dioxide membrane separation module adopts the carbon dioxide membrane separation module 330 as an example for further introduction.

[0090] Specifically, when the carbon dioxide membrane separation module 330 is used to separate carbon dioxide, three process units are included: a membrane separation unit 331 , a vacuum unit 332 and a buffer unit 333 .

[0091] Furthermore, in the carbon dioxide membrane separation module 330, the number of each unit can be selected from 0 to 100, such as 0, 5, 10, 20, 50, 100, etc., and each unit can be connected in series and / or in parallel.

[0092] The membrane separation unit 331 may be a composite membrane material component with high carbon dioxide selectivity and permeability, such as a modified membrane with polyimide as a matrix and doped with specific metal ions or nanoparticles. The material type, quantity and connection method of the membrane separation unit 331 may be flexibly adjusted according to the actual carbon capture purity requirements, flue gas components and flue gas flow.

[0093] Furthermore, a special gas distributor and guide plate may be provided inside the membrane separation unit 331 to ensure uniform distribution and stable flow of flue gas on the membrane surface, reduce gas concentration polarization, and improve the efficiency and stability of carbon dioxide separation.

[0094] Among them, you can choose according to the actual application scenario. Figure 2a A two-stage segmented membrane separation module in which N is 2; Figure 2b The diagram shows a two-stage series membrane separation module with N being 2; Figure 2c This illustrates a two-stage parallel membrane separation module with N being 2. However, the value of N is not limited thereto, and N may also be a multi-stage carbon dioxide separation module greater than 2. There is no excessive restriction here, such as the value of N may include 5, 10, 20, 50, 100, etc.

[0095] The following only introduces the two-stage, two-stage series, and two-stage parallel carbon dioxide separation module as an example, and the concept of "multi-stage carbon dioxide separation module" is not repeated.

[0096] Two-stage: Figure 2a The two-stage structure is usually used to improve the efficiency of carbon dioxide separation. First, the gas that has undergone a series of treatments enters the primary carbon dioxide separation. Driven by a certain pressure difference or concentration difference, the carbon dioxide begins to permeate through the primary membrane separation unit 331 and enter the other side of the membrane, and the remaining trapped gas is left outside the membrane. The separated carbon dioxide gas is pumped into the buffer unit 333 such as a buffer tank through the vacuum unit 332 such as a vacuum pump and then directly injected into the carbon dioxide storage module in the carbon dioxide storage device 400, while the primary trapped gas will be connected to the secondary carbon dioxide separation through a pipeline, in order to perform secondary separation on the residual carbon dioxide that may exist in the trapped gas.

[0097] Two-stage series connection: Figure 2b The series structure is mainly used to improve the purity of the separated carbon dioxide. First, the gas that has undergone a series of treatments enters the first-level carbon dioxide separation. Driven by a certain pressure difference or concentration difference, the carbon dioxide begins to permeate through the first-level membrane separation unit 331 and enter the other side of the membrane. The remaining trapped gas is left outside the membrane. Since the trapped gas at this time is already a clean flue gas that has been strictly treated, it can be uniformly discharged through the external exhaust pipe. It can be considered whether to enable the vacuum pump to promote the accelerated filtration of carbon dioxide according to the actual pressure conditions on both sides of the membrane. After buffering in the buffer tank, it enters the second-level carbon dioxide separation, where the second-level carbon dioxide separation process is similar to the first-level carbon dioxide separation, and is intended to filter and purify carbon dioxide again. It should be noted that the specific selection of the corresponding units in each level of carbon dioxide separation may be the same or different, and can be personalized according to the actual gas components and filtration order.

[0098] Two-stage parallel connection: Figure 2cThe parallel structure is mainly used to improve the time efficiency of carbon dioxide separation and increase the amount of carbon dioxide captured at the same time. When the incoming gas flow rate increases suddenly, this method can be used to increase the total gas volume processed by the system. It can be understood as directly connecting two primary carbon dioxide separation modules in parallel.

[0099] It should be pointed out that in special application scenarios, multi-stage, series and parallel types can be used in combination to further improve the purity and capture rate of carbon dioxide at the same time, and the membrane materials at each level can be selected individually according to the actual gas composition, flow rate and target capture purity. It is possible to consider adding a three-way valve and a pipeline between the two-stage membrane separation unit 331 to facilitate flexible change of strategies and coordinated work.

[0100] As an example, the carbon dioxide storage module may include a high-pressure storage tank or a cryogenic liquefied storage tank.

[0101] Specifically, the carbon dioxide storage module is used to safely encapsulate and store captured carbon dioxide. It can be considered to be equipped with a container-type high-pressure storage tank or a cryogenic liquefied storage tank to store the carbon dioxide separated from the carbon dioxide separation module. The unique design of this component greatly improves the efficiency and flexibility of loading and unloading replacement.

[0102] As an example, a switching unit, a monitoring unit and a controller that communicate with each other may also be provided, wherein the monitoring unit includes one or a combination of a pressure monitoring unit, a temperature monitoring unit, a flow monitoring unit and a purity monitoring unit, and the communication method includes one or a combination of wired communication and wireless communication.

[0103] For details, please refer to Figure 3 and Figure 4 The carbon dioxide storage module may also be provided with an auxiliary module 500, wherein the auxiliary module 500 may also be a modular device with a fixing seat, which is not described in detail here. The auxiliary module 500 may include the switch unit, the monitoring unit, and the controller, etc., and the specific unit type and connection method are not limited here.

[0104] Wherein, the monitoring unit may include one or a combination of a pressure monitoring unit, a temperature monitoring unit, a flow monitoring unit and a purity monitoring unit, etc. The setting of the monitoring unit can enable the system to have complete pressure monitoring, temperature monitoring, etc. to ensure the safe storage and transportation of carbon dioxide, and under the premise of ensuring that the size of the container can be moved as a whole, the appropriate type and specification of the storage tank can be selected according to the storage requirements and space conditions of the specific use scenario. The setting of the controller can establish a control connection between the modules, so as to connect the controls of each module through signal transmission, so as to realize the centralized control and automatic operation of the entire carbon dioxide capture system. During the control connection process, in order to ensure the accuracy and stability of signal transmission, a suitable communication protocol and control algorithm can be used to realize the collaborative work between the modules. Wherein, the communication method may include one or a combination of wired communication and wireless communication, which is not limited here.

[0105] The connecting pipe between the flue gas pretreatment module and the safety gas pretreatment module is preferably made of acid-resistant, alkali-resistant and high-temperature-resistant stainless steel pipe, and the pipe can be installed with a flow control valve, a pressure sensor and a check valve. The flow control valve can accurately control the flue gas flow entering the safety gas pretreatment module according to the overall operation of the system; the pressure sensor can monitor the pressure in the pipe in real time and feed back the signal to the controller to adjust the operating parameters; the check valve can prevent gas backflow and protect the safety of the equipment.

[0106] The pipeline connection between the internal processes of the safety gas pretreatment module and the carbon dioxide separation module can select appropriate pipes according to the requirements of different equipment, such as seamless steel pipes for high-pressure parts and copper pipes with good thermal insulation performance for low-temperature parts. Flange connections or welding connections with excellent sealing performance can be used at the connection parts, and necessary filters, one-way valves and pressure regulators can be installed to ensure stable and efficient transmission of gas between the processes, and avoid impurities clogging the membrane separation unit 331 or pressure fluctuations affecting the separation effect.

[0107] The pipeline between the carbon dioxide separation module and the carbon dioxide storage module needs to be resistant to high pressure and corrosion, such as titanium alloy pipeline. Purity analyzers, flow controllers and emergency shut-off valves can be set on the pipeline. Among them, the purity analyzer can monitor the purity of carbon dioxide in real time. When the purity reaches the set storage standard, the flow controller can adjust the storage flow of carbon dioxide according to the storage status and pressure of the storage tank. The emergency shut-off valve quickly cuts off the pipeline connection when abnormal conditions occur in the system, such as excessive pressure, leakage, etc., to ensure safety.

[0108] As an example, a shock absorbing unit is provided between each module and the corresponding fixed seat; and / or a shock absorbing unit is provided between the corresponding fixed seat and the base in each device; wherein the shock absorbing unit comprises a shock absorbing rubber pad or a spring shock absorber. That is, a shock absorbing unit may be provided between the flue gas pretreatment module and the flue gas pretreatment fixed seat, the safety gas pretreatment module and the safety gas pretreatment fixed seat, the carbon dioxide separation module and the carbon dioxide separation fixed seat, and the carbon dioxide storage module and the carbon dioxide storage fixed seat; and / or a shock absorbing unit is provided between the flue gas pretreatment fixed seat, the safety gas pretreatment fixed seat, the carbon dioxide separation fixed seat, and the carbon dioxide storage fixed seat and the corresponding base; wherein the shock absorbing unit comprises a shock absorbing rubber pad or a spring shock absorber.

[0109] Specifically, when the fixing seats corresponding to each module have standard specified dimensions, such as container dimensions, it can be convenient to form a "container-type" complete process flow, which can be applicable to different application scenarios, such as ships and other application scenarios, to achieve flexible disassembly, assembly, maintenance, adjustment, and transportation.

[0110] Among them, when the shock-absorbing unit, such as a shock-absorbing rubber pad or a spring shock absorber, is arranged between the flue gas pretreatment module and the flue gas pretreatment fixed seat, the safety gas pretreatment module and the safety gas pretreatment fixed seat, the carbon dioxide separation module and the carbon dioxide separation fixed seat, and the carbon dioxide storage module and the carbon dioxide storage fixed seat, the vibration generated during the operation of the equipment can be reduced and the stability can be improved, especially for some equipment with large vibration, such as compressors.

[0111] Similarly, when the shock absorbing unit, such as a shock absorbing rubber pad or a spring shock absorber, is arranged between the flue gas pretreatment fixing seat, the safety gas pretreatment fixing seat, the carbon dioxide separation fixing seat and the carbon dioxide storage fixing seat and the corresponding base, the vibration generated during the operation of the equipment can be reduced, and the impact on the overall structure of the ship and other equipment can be avoided.

[0112] Among them, each fixing seat can be welded with high-strength steel to have sufficient rigidity and stability. The fixing seat and the corresponding base can be fixed by means such as bolt connection, snap connection or welding connection to fix at a designated position such as a ship deck or engine room.

[0113] The carbon dioxide capture system in this embodiment has the following beneficial effects:

[0114] 1. Standardization: All process equipment involved are considered to be produced in standard sizes, so as to facilitate the serial and / or parallel assembly of multiple links, and to be installed on a base with standard sizes, forming a "container-type" complete process flow, which is convenient for flexible disassembly, assembly, maintenance and adjustment in different scenarios (such as ships), and reduces industrial production costs in the long run, and promotes the formation of a processing industry chain for related equipment. Effectively solve the problem that the existing carbon dioxide capture device needs to be individually customized according to different application scenarios and actual flue gas conditions, has a long construction period, high cost, high difficulty and difficult operation.

[0115] 2. Economical and efficient: Compared with the traditional chemical adsorption method, the membrane separation method has lower energy consumption, and the modular design reduces the manufacturing, installation and maintenance costs of the equipment, thus having better economy in long-term operation, which is beneficial for operators of different industrial enterprises (including but not limited to ships) to meet environmental protection requirements and effectively reduce the operating costs of carbon dioxide capture by about 50%.

[0116] 3. High flexibility and compact size: Modular splicing connection allows each module to be flexibly disassembled and assembled according to the actual flue gas emissions, spatial layout and operating conditions of different application scenarios, which is convenient for installation and application in application scenarios of different types and scales, such as ships, and a single module can be easily upgraded or maintained without affecting the operation of the entire system.

[0117] 4. Stability and reliability: The perfect pipeline connection and base fixing method, as well as the stable operation settings inside each module, ensure that the entire carbon dioxide capture system can operate reliably in complex operating environments, such as ship swaying, vibration, temperature and humidity changes, etc., reducing the probability of failure and increasing the service life of the system.

[0118] 5. High efficiency of capture effect: Through optimized flue gas pretreatment and multi-stage carbon dioxide separation (including two stages), carbon dioxide can be efficiently captured from the incoming flue gas, the capture rate and purity of carbon dioxide can be improved, carbon emissions can be reduced, and a positive contribution can be made to addressing global climate change.

[0119] Embodiment 2

[0120] See also Figure 3 This embodiment provides another carbon dioxide capture system, which is different from the first embodiment mainly in that:

[0121] Each module in the flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module includes self-series connection and / or self-parallel connection.

[0122] like Figure 3In this embodiment, each module in the flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module is connected in series and / or in parallel to form a carbon dioxide capture block, and the carbon dioxide capture system includes M>1 carbon dioxide capture blocks connected in parallel.

[0123] Specifically, Figure 3 , having M1, M2...Mn carbon dioxide capture blocks, each block includes the flue gas pretreatment device 100, the safety gas pretreatment device 200, and the carbon dioxide separation device 300 that are assembled and connected, and the assembled and connected carbon dioxide capture blocks can be stacked and connected in parallel with each other through a base support 600 to flexibly adjust the processing gas volume, and the outlet of each carbon dioxide capture block can be connected to the inlet pipe of the carbon dioxide storage devices 400 such as M1, M2...Mn.

[0124] Furthermore, each of the carbon dioxide capture blocks may have the same structure, and of course may also be configured to have different structures as required.

[0125] Among them, the components, connections, fixation, etc. of the flue gas pretreatment module, the safety gas pretreatment module, the carbon dioxide separation module, etc. in the carbon dioxide capture block can all be referred to in Example 1, and will not be repeated here.

[0126] See also Figure 4 A schematic diagram of the structural distribution of the carbon dioxide capture block using a combination of series and parallel connections is shown.

[0127] Specifically, Figure 4 2 shows a schematic diagram of the structural distribution of the carbon dioxide capture block M1 ′ including two flue gas pretreatment devices 100 connected in parallel and four carbon dioxide separation devices 300 connected in series, but the connection method of each carbon dioxide capture block is not limited thereto.

[0128] Embodiment 3

[0129] See also Figure 1 to Figure 5 This embodiment provides a method for capturing carbon dioxide, which comprises the following steps:

[0130] Provided are a flue gas pretreatment device, a safety gas pretreatment device and a carbon dioxide separation device, wherein the flue gas pretreatment device comprises a flue gas pretreatment fixing seat and a flue gas pretreatment module arranged on the flue gas pretreatment fixing seat; the safety gas pretreatment device comprises a safety gas pretreatment fixing seat and a safety gas pretreatment module arranged on the safety gas pretreatment fixing seat; the carbon dioxide separation device comprises a carbon dioxide separation fixing seat and a carbon dioxide separation module arranged on the carbon dioxide separation fixing seat;

[0131] The flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module are assembled and connected through the flue gas pretreatment fixing seat, the safety gas pretreatment fixing seat and the carbon dioxide separation fixing seat to form a carbon dioxide capture system;

[0132] The flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module are started in sequence to capture carbon dioxide.

[0133] Among them, the structure, connection, etc. of the carbon dioxide capture system can be referred to Example 1 and Example 2, and will not be described in detail here.

[0134] The specific operations of the carbon dioxide capture method are introduced below.

[0135] (1) Installation of CO2 capture system

[0136] Firstly, the modules required in the carbon dioxide capture system are provided according to the actual space and flue gas volume of the application scenario.

[0137] Next, the flue gas pretreatment device is installed, including connecting and fixing the exhaust gas washing unit 101, the cooling unit 102, the dust removal unit 103, the desulfurization unit 104, the denitrification unit 105 and the waste heat recovery unit 106 and other equipment on the flue gas pretreatment fixed seat in accordance with a preset process flow sequence to form the flue gas pretreatment module arranged on the flue gas pretreatment fixed seat, and ensuring that the connection between the units is tight and the pipeline layout is reasonable.

[0138] And, installing the safety gas pretreatment device, including connecting and fixing the first gas-liquid separation unit 201, the first buffer unit 202, the compression unit 203, the cooling unit 204, the second gas-liquid separation unit 205, the filtering unit 206, the second buffer unit 207, the heating unit 208, the waste heat recovery unit 209 and the waste heat utilization unit 210 and other equipment on the safety gas pretreatment fixing seat in accordance with a preset process flow sequence to form the safety gas pretreatment module arranged on the safety gas pretreatment fixing seat, and the safety gas pretreatment module is connected to the outlet pipe of the flue gas pretreatment module.

[0139] And, installing the carbon dioxide separation device includes fixing the carbon dioxide separation module on the carbon dioxide separation fixed seat. In this embodiment, the carbon dioxide membrane separation module having the membrane separation unit 331, the vacuum unit 332 and the buffer unit 333 is taken as an example, but the specific type of the carbon dioxide separation module and the setting of the units contained are not limited to this. Specifically, it includes connecting and fixing the membrane separation unit 331 and its related compression and buffer tanks and other equipment on the carbon dioxide separation fixed seat according to the pre-set process flow sequence to form the carbon dioxide membrane separation module arranged on the carbon dioxide separation fixed seat, wherein, it includes a secondary membrane separation module with N being 2, or a multi-stage membrane separation module with N being greater than 2, and the carbon dioxide membrane separation module is connected to the outlet pipe of the safety gas pretreatment module, and the outlet of the carbon dioxide membrane separation module is connected to the pipe of the carbon dioxide storage module.

[0140] It should be noted that when connecting and fixing the modules, it is necessary to reserve residual liquid removal pipelines, trapped gas release pipelines, and series and parallel interfaces and spaces between modules or units.

[0141] (2) Start-up of the CO2 capture system

[0142] First, after completing the installation of the carbon dioxide capture system, each module needs to be checked to ensure that the equipment is connected correctly, the pipeline is leak-free, the electrical system is normal, etc.

[0143] Next, the flue gas pretreatment module is started, and each equipment unit is started in sequence according to the pre-set process flow, for example: tail gas washing, cooling, dust removal, desulfurization, and denitrification, and the operating parameters of each unit are gradually adjusted to meet the set requirements.

[0144] Next, start the safety gas pretreatment module, and start each equipment unit in sequence according to the pre-set process flow, for example: gas-liquid separation, buffer tank, compression, cooling, gas-liquid separation, filtration, buffer tank, electric heating, to ensure smooth connection between the units and stable gas flow and pressure monitoring.

[0145] Next, start the carbon dioxide separation module, such as starting the primary membrane separation unit first, and after it runs stably, start the secondary membrane separation unit or the multi-stage membrane separation unit with N>2 as needed, and start the relevant compression and buffer tanks at the same time to ensure the normal separation and storage process of carbon dioxide.

[0146] Furthermore, when carrying out the carbon dioxide capture method, it is preferred that the following steps are also included:

[0147] (3) Monitoring of CO2 capture systems

[0148] First, during the operation of the carbon dioxide capture system, it is preferred to monitor the key operating parameters of each module in real time through the monitoring unit, such as monitoring the inlet and outlet gas temperature, pressure, composition, etc. of the flue gas pretreatment module, monitoring the gas flow, pressure, temperature, etc. of the safety gas pretreatment module, and monitoring the membrane flux, pressure difference on both sides of the membrane, separation efficiency, carbon dioxide purity, etc. of the carbon dioxide membrane separation module.

[0149] Furthermore, according to the monitoring data, the operating parameters of each module can be adjusted in time through the controller communicating with the monitoring unit to ensure the efficient operation of the system. For example, if it is found that the dust removal effect of the flue gas pretreatment module is not good, the operating parameters of the dust removal equipment can be adjusted in time or the equipment maintenance can be carried out; if the separation efficiency of the carbon dioxide membrane separation module decreases, the carbon dioxide membrane separation unit can be checked for blockage or damage, and corresponding measures can be taken to repair or replace it.

[0150] (4) Module disassembly

[0151] When the carbon dioxide capture system needs to be maintained or repaired, or the scale of carbon dioxide capture needs to be adjusted according to actual operation conditions, each module in the carbon dioxide capture system can be disassembled. The specific operations are as follows:

[0152] First, the carbon dioxide separation module is shut down, and the operation of related equipment units is stopped. Then, in the reverse order of the startup, each equipment unit is shut down in turn, and the connecting pipelines with other modules are disconnected.

[0153] Next, the safety gas pre-treatment module is turned off, and each equipment unit is turned off and the pipeline connection is disconnected in the reverse order of the startup.

[0154] Next, the flue gas pretreatment module is turned off. After the shutdown operation of the entire carbon dioxide capture system is completed, each module is disassembled and removed in the reverse order of installation.

[0155] Among them, when the carbon dioxide capture system is operated in series and / or in parallel, the following matters needing attention are included:

[0156] (1) Module selection

[0157] The appropriate module type, quantity and connection method need to be determined according to the incoming flue gas emissions, gas composition and carbon capture requirements. For example, if it is applied to ship carbon dioxide capture and the flue gas emissions are small, a single carbon dioxide membrane separation module can be selected; if the carbon dioxide capture efficiency is required to be high, the number of stages of the carbon dioxide membrane separation module can be increased, that is, the value of the number of stages N can be increased.

[0158] (2) Physical connection

[0159] First, each module is preferably produced in a standardized size, so that the standard container can be regarded as the corresponding fixed seat in each module, and the "container-type" assembly connection can be realized for flexible transportation. At the same time, each processing device is preferably provided with a dedicated base, so that the "container-type" equipment can be fixed to a designated position such as a ship through the corresponding fixed seat by means such as bolts or welding, so as to ensure the stability of each equipment during operation.

[0160] Furthermore, the modules can be connected through special pipes, which can be connected by quick-connect joints or flanges to ensure the tightness and reliability of the connection. During the connection process, attention should be paid to the direction and layout of the pipes to avoid bending, blockage or leakage.

[0161] Furthermore, the shock absorbing unit may be arranged between the corresponding fixing seat and the base to play a supporting and connecting role, enhance the overall strength and stability of each module combination, and prevent the module from being displaced or damaged due to vibration or external force during operation.

[0162] Furthermore, power supply is provided to the equipment units in each module, such as by connecting the electrical system of each module to the main power supply system of the crude oil equipment through cables. During the electrical connection process, it is necessary to ensure that the cable specifications meet the power requirements of the equipment, and to do a good job of cable protection and grounding to prevent electrical failures and safety accidents.

[0163] Furthermore, control connections between modules are established, and the modules can be connected through the controller to achieve centralized control and automated operation of the entire carbon dioxide capture system. During the control connection process, the accuracy and stability of signal transmission must be ensured, and appropriate communication protocols and control algorithms must be used to achieve collaborative work between modules.

[0164] Among them, for the pipeline switching operation between modules, the following precautions are included:

[0165] (1) Pipeline switching during normal operation

[0166] During the normal operation of the carbon dioxide capture system, when it is necessary to maintain or overhaul an equipment unit in a module, the gas can be bypassed by switching the pipeline to ensure that other parts of the carbon dioxide capture system can continue to operate. For example, in the flue gas pretreatment module, if a cooling equipment unit needs to be repaired, the switch units before and after the equipment unit, such as valves, can be closed, and the valve on the bypass pipeline can be opened at the same time, so that the gas can bypass the cooling equipment unit through the bypass pipeline to enter the next processing link.

[0167] When performing pipeline switching operations, it is necessary to pay close attention to changes in the operating parameters of the carbon dioxide capture system to ensure that parameters such as gas flow, pressure and temperature remain stable during the switching process to avoid impact on other equipment or affecting the overall operating effect of the carbon dioxide capture system.

[0168] (2) Pipeline switching when adding or removing modules

[0169] When it is necessary to add or reduce modules, the corresponding pipelines need to be switched. For example, when adding a carbon dioxide membrane separation module, the process flow needs to be suspended first, and the newly added carbon dioxide membrane separation module needs to be connected to the pipelines between the existing safety gas pretreatment module and the carbon dioxide storage module, or connected to the reserved three-way valve vacant interface, and the relevant valve settings need to be adjusted to ensure that the gas can smoothly enter the newly added module for processing. Among them, it is necessary to pay attention to setting a matching valve group such as a one-way valve to ensure the correct direction of the airflow.

[0170] When reducing a module, it is necessary to first close the inlet and outlet valves of the module, exhaust the gas in the module, and then disconnect the pipelines from other modules, and seal the disconnected pipelines to prevent gas leakage. When adding or reducing modules, the pipeline connections and valve settings between the modules should be reasonably adjusted according to the overall settings and operation requirements of the carbon dioxide capture system to ensure the normal operation and capture efficiency of the carbon dioxide capture system.

[0171] In order to further demonstrate the advantages of the carbon dioxide capture system of the present invention, the modular and standardized carbon dioxide capture system of the present invention is compared with the existing customized carbon dioxide capture system, and the carbon dioxide capture system is introduced from the perspective of economic benefits.

[0172] Among them, the existing customized carbon dioxide capture system needs to be individually designed and manufactured according to the specific application scenario, resulting in a long production cycle, high design cost, process adjustment cost and on-site installation cost. The modular and standardized carbon dioxide capture system of the present invention is produced using standardized components of container size, which can greatly shorten the production cycle and reduce manufacturing and maintenance costs.

[0173] The following is an example of treating the same incoming gas and achieving the same emission standards:

[0174] The production cycle of a customized carbon dioxide capture system is 6-12 months; while the production cycle of the modular and standardized carbon dioxide capture system of the present invention is only 2-3 months.

[0175] After the modular and standardized carbon dioxide capture system of the present invention is modularly designed, the design of standard modules can be reused, saving more than 50% of the design costs; standardized batch production can reduce process adjustment time and manual operations, and reduce the manufacturing cost of a single unit by about 30%; modular components adopt container standards and can be directly transported to the application site, reducing installation time and labor costs by about 40%; standard parts are easy to replace and upgrade, and it is expected that maintenance costs will drop by 20%-30%.

[0176] Taking the power industry as an example, the modular and standardized carbon dioxide capture system of the present invention can reduce manufacturing costs by about 30% and maintenance costs by about 20% after the standardized modules are popularized in transformer manufacturing.

[0177] Taking the marine transportation industry as an example, the modular and standardized carbon dioxide capture system of the present invention can reduce global logistics costs by more than 35% and improve cargo loading and unloading efficiency by about 50% after container standardization.

[0178] Taking the heating, ventilation and air conditioning (HVAC) industry as an example, the modular and standardized carbon dioxide capture system of the present invention can reduce equipment manufacturing costs by about 25% and on-site installation costs by about 40% after standardization.

[0179] For cost comparison, please refer to the following table:

[0180] Cost Items Custom parts(current) Standard parts (forecast) Cost reduction ratio Design Cost ￥100,000 yuan / set ￥50,000 yuan / set 50％ Manufacturing Cost ￥600,000 yuan / set ￥420,000 yuan / set 30％ Shipping and installation costs ￥200,000 yuan / set ￥120,000 yuan / set 40％ Maintenance cost (year) ￥100,000 yuan / year ￥70,000 yuan / year 30％ Total Cost RMB 1 million RMB 700,000 30％

[0181] Therefore, the modular and standardized carbon dioxide capture system of the present invention can significantly reduce the cost of design, manufacturing, transportation, installation and maintenance, while improving the flexibility and adaptability of the system; and standardized production can promote the formation of a complete industrial chain, thereby significantly reducing the operating costs of the entire industry and creating a larger market space for the popularization of carbon capture equipment.

[0182] In summary, the carbon dioxide capture method of the present invention has the carbon dioxide capture system, and the carbon dioxide capture system includes the flue gas pretreatment device, the safety gas pretreatment device and the carbon dioxide separation device, wherein the flue gas pretreatment device includes a flue gas pretreatment fixed seat and a flue gas pretreatment module arranged on the flue gas pretreatment fixed seat; the safety gas pretreatment device includes a safety gas pretreatment fixed seat and a safety gas pretreatment module arranged on the safety gas pretreatment fixed seat; the carbon dioxide separation device includes a carbon dioxide separation fixed seat and a carbon dioxide separation module arranged on the carbon dioxide separation fixed seat; and the flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module are assembled and connected through their respective corresponding fixed seats.

[0183] Furthermore, the carbon dioxide capture system may also include the carbon dioxide storage device, and the carbon dioxide storage device includes the carbon dioxide storage fixing seat and a carbon dioxide storage module arranged on the carbon dioxide storage fixing seat, and the flue gas pretreatment module, the safety gas pretreatment module, the carbon dioxide separation module and the carbon dioxide storage module are assembled and connected through their respective corresponding fixing seats.

[0184] The carbon dioxide capture method of the present invention assembles and connects the flue gas pretreatment device, the safety gas pretreatment device, the carbon dioxide separation device and the carbon dioxide storage device, which can make carbon dioxide capture more flexible and efficient and expand the scope of application scenarios; allows users to flexibly increase or decrease, adjust the sequence and set up series and parallel connections of each device according to the specific conditions of the actual incoming gas, thereby improving the working efficiency of the equipment; can facilitate the flexible disassembly, assembly, maintenance and adjustment of each device in different application scenarios, and reduce industrial production costs in the long run, and facilitate the formation of a processing industry chain; the pipeline connections between the devices are convenient, and the combined disassembly and assembly are efficient, which can greatly improve the carbon dioxide capture efficiency and provide a more efficient engineering operation idea for flexible capture in specific scenarios; each module can achieve a stable connection with the base.

[0185] The carbon dioxide capture method of the present invention has the characteristics of standardization, economic efficiency, high flexibility, small size, compactness, stability, reliability and high capture effect.

[0186] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0187] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for capturing carbon dioxide, characterized in that: The following steps are involved: Provided are a flue gas pretreatment device, a safety gas pretreatment device and a carbon dioxide separation device, wherein the flue gas pretreatment device comprises a flue gas pretreatment fixing seat and a flue gas pretreatment module arranged on the flue gas pretreatment fixing seat; the safety gas pretreatment device comprises a safety gas pretreatment fixing seat and a safety gas pretreatment module arranged on the safety gas pretreatment fixing seat; the carbon dioxide separation device comprises a carbon dioxide separation fixing seat and a carbon dioxide separation module arranged on the carbon dioxide separation fixing seat; The flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module are assembled and connected through the flue gas pretreatment fixing seat, the safety gas pretreatment fixing seat and the carbon dioxide separation fixing seat to form a carbon dioxide capture system; The flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module are started in sequence to capture carbon dioxide.

2. The method for capturing carbon dioxide according to claim 1, characterized in that: The carbon dioxide capture system also includes a carbon dioxide storage device, which includes a carbon dioxide storage fixing seat and a carbon dioxide storage module arranged on the carbon dioxide storage fixing seat, and the flue gas pretreatment module, the safety gas pretreatment module, the carbon dioxide separation module and the carbon dioxide storage module are assembled and connected through their corresponding fixing seats.

3. The method for capturing carbon dioxide according to claim 1 or 2, characterized in that: Each mount has a container size including 20 feet, 40 feet, or 45 feet.

4. The method for capturing carbon dioxide according to claim 1, characterized in that: Each module in the flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module includes self-series connection and / or self-parallel connection.

5. The method for capturing carbon dioxide according to claim 4, characterized in that: The flue gas pretreatment module, the safety gas pretreatment module and the carbon dioxide separation module are connected in series and / or in parallel to form a carbon dioxide capture block, and the carbon dioxide capture system includes M>1 carbon dioxide capture blocks connected in parallel.

6. The method for capturing carbon dioxide according to claim 1, characterized in that: The flue gas pretreatment module includes a tail gas washing unit, a cooling unit, a dust removal unit, a desulfurization unit and a denitrification unit; and / or the safety gas pretreatment module includes a first gas-liquid separation unit, a first buffer unit, a compression unit, a cooling unit, a second gas-liquid separation unit, a filtering unit, a second buffer unit and a heating unit; the corresponding units in each module include self-series connection and / or self-parallel connection; the selected number of each unit includes 0 to 100.

7. The method for capturing carbon dioxide according to claim 6, characterized in that: The flue gas pretreatment module further includes a waste heat recovery unit corresponding to the cooling unit; the safety gas pretreatment module further includes a waste heat recovery unit corresponding to the cooling unit and / or a waste heat utilization unit corresponding to the heating unit.

8. The method for capturing carbon dioxide according to claim 1, characterized in that: The carbon dioxide separation module includes one or a combination of a carbon dioxide chemical adsorption separation module, a carbon dioxide physical adsorption separation module, a carbon dioxide membrane separation module and a carbon dioxide cryogenic distillation module; the carbon dioxide membrane separation module includes a membrane separation unit, a vacuum unit and a buffer unit; each unit includes self-series connection and / or self-parallel connection, and the selected number of each unit includes 0 to 100.

9. The method for capturing carbon dioxide according to claim 1 or 2, characterized in that: A shock absorbing unit is provided between each module and the corresponding fixed seat; and / or a shock absorbing unit is provided between the corresponding fixed seat and the base in each device; Wherein, the shock absorbing unit includes a shock absorbing rubber pad or a spring shock absorber.

10. The method for capturing carbon dioxide according to claim 1 or 2, characterized in that: The carbon dioxide capture system is also provided with a switch unit, a monitoring unit and a controller that communicate with each other, wherein the monitoring unit includes one or a combination of a pressure monitoring unit, a temperature monitoring unit, a flow monitoring unit and a purity monitoring unit, and the communication method includes one or a combination of wired communication and wireless communication.

11. The method for capturing carbon dioxide according to claim 1, characterized in that: The carbon dioxide capture method is applicable to the capture of fixed carbon dioxide emission sources or mobile carbon dioxide emission sources.

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