Carbon dioxide and desulfurization wastewater comprehensive treatment system
By integrating carbon dioxide storage and desulfurization wastewater treatment systems to generate sulfonates, the high cost of carbon dioxide and desulfurization wastewater treatment in coal-fired power plants is solved, achieving economical and efficient carbon dioxide sequestration and wastewater treatment.
Patent Information
- Application Number
- CN202511339110.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-18
- Publication Date
- 2026-01-02
AI Technical Summary
The treatment costs of desulfurization wastewater and carbon dioxide generated by coal-fired power plants are high, and the cost of separately storing carbon dioxide is also high, making it difficult to effectively mitigate global warming.
It integrates a carbon dioxide storage component, a sodium hydroxide storage component, an absorber, an electrocatalyst, a gas separator, and an evaporation crystallization component. Through electrocatalytic reaction and ion exchange, it generates sulfonates, achieving comprehensive treatment of carbon dioxide and desulfurization wastewater.
It reduces equipment footprint and investment costs, generates economically viable sulfonate products, lowers carbon dioxide sequestration costs, and reduces greenhouse gas emissions.
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Figure CN121248039A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of environmental protection equipment, and particularly relates to a carbon dioxide and desulfurization wastewater and comprehensive treatment system. BACKGROUND
[0002] A large amount of desulfurization wastewater is generated in the operation process of a coal-fired power plant, and the desulfurization wastewater is wastewater generated after sulfur dioxide in flue gas is removed in an industrial process such as a coal-fired power plant, and contains a certain amount of sulfur. CO2 is one of the main greenhouse gases, which can absorb and re-radiate heat from the earth's surface, causing global warming. By storing CO2, the concentration of CO2 in the atmosphere can be reduced, and the speed of global warming can be slowed down. However, the cost of storing only carbon dioxide is high. SUMMARY
[0003] The application provides a carbon dioxide and desulfurization wastewater and comprehensive treatment system, which is convenient for treating carbon dioxide and wastewater to reduce greenhouse gas emissions and wastewater pollution.
[0004] The carbon dioxide and desulfurization wastewater and comprehensive treatment system of the application comprises:
[0005] A carbon dioxide storage assembly, a sodium hydroxide storage liquid assembly and an absorber, the output ends of the carbon dioxide storage assembly and the sodium hydroxide storage liquid assembly are communicated with the inlet of the absorber;
[0006] A four-way valve, an electro-catalyst, a wastewater treatment assembly and a mixer, the electro-catalyst has a first channel and a second channel, one end of the wastewater treatment assembly is communicated with the first inlet of the mixer, the first port of the four-way valve is connected with the outlet of the absorber, the second port of the four-way valve is communicated with the inlet of the first channel, and the third port of the four-way valve is communicated with the second inlet of the mixer;
[0007] A gas separator and an evaporation crystallization assembly, the inlet of the gas separator is communicated with the outlet of the first channel, the outlet of the gas separator is communicated with the fourth port of the four-way valve, and the evaporation crystallization assembly is connected with the outlet of the second channel, wherein the first port of the four-way valve is communicated with the second port, and the third port is communicated with the fourth port.
[0008] In some embodiments, the carbon dioxide storage assembly comprises a gas storage tank and a first flow control valve, one end of the gas storage tank is connected with the first flow control valve, and the other end of the first flow control valve is connected with the absorber.
[0009] In some embodiments, the wastewater treatment assembly comprises a filter, a distiller and a concentration measuring instrument, one end of the filter is connected with a desulfurization wastewater source, the other end of the filter is connected with the distiller, the outlet of the distiller is provided with a concentration measuring instrument, and the outlet of the distiller is communicated with the first inlet of the mixer.
[0010] In some embodiments, the evaporation crystallization assembly comprises an evaporation crystallizer and a mass spectrometer, the evaporation crystallizer inlet is connected with the second channel outlet, and the evaporation crystallizer inlet is provided with the mass spectrometer.
[0011] In some embodiments, the carbon dioxide and desulfurization wastewater and comprehensive treatment system further comprises a power generation assembly and a power storage device, the power generation assembly output is connected with the power storage device, and the power storage device is connected with the electro-catalytic reactor to provide electric energy.
[0012] In some embodiments, the carbon dioxide and desulfurization wastewater and comprehensive treatment system further comprises a second flow regulating valve, one end of the second flow regulating valve is connected with the mixer outlet, and the other end of the second flow regulating valve is connected with the second channel inlet of the electro-catalytic reactor.
[0013] In some embodiments, the carbon dioxide and desulfurization wastewater and comprehensive treatment system further comprises a third flow regulating valve, one end of the third flow regulating valve is connected with the second inlet of the absorber, and one end of the third flow regulating valve is connected with the sodium hydroxide storage assembly.
[0014] In some embodiments, the sodium hydroxide storage assembly comprises a storage tank and a delivery pump, the storage tank is connected with the delivery pump inlet, and the delivery pump outlet is connected with the third flow regulating valve.
[0015] In some embodiments, the carbon dioxide and desulfurization wastewater and comprehensive treatment system further comprises a thermometer, and the thermometer is arranged on the mixer.
[0016] In some embodiments, the carbon dioxide and desulfurization wastewater and comprehensive treatment system further comprises a fourth flow regulating valve, one end of the fourth flow regulating valve is connected with the first channel inlet, and the other end of the fourth flow regulating valve is connected with the second port of the four-way valve. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present application, the drawings required in the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0018] Figure 1 A schematic diagram of a carbon dioxide and desulfurization wastewater and comprehensive treatment system according to an embodiment of the present application is shown in the following figure.
[0019] In the above drawings, the following reference signs are used:
[0020] Carbon dioxide storage assembly 1, gas storage tank 11, first flow control valve 12, sodium hydroxide storage assembly 2, absorber 3, four-way valve 4, electrocatalyst 5, wastewater treatment assembly 6, filter 61, distiller 62, concentration meter 63.
[0021] Mixer 7, gas separator 8, power generation component 9, evaporation and crystallization component 10, energy storage device 20, second flow regulating valve 30, third flow regulating valve 40, fourth flow regulating valve 50. Detailed Implementation
[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.
[0023] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two elements. The terms "parallel," "perpendicular," and "equal" include the described situation and situations similar to the described situation, the range of which is within an acceptable deviation range, wherein the acceptable deviation range is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where an acceptable deviation range for approximate parallelism can be, for example, within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where an acceptable deviation range for approximate perpendicularity can also be, for example, within 5°. "Equal" includes absolute equality and approximate equality, where an acceptable deviation range for approximate equality can be, for example, a difference between the two equal items being less than or equal to 5% of either one. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.
[0024] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0025] The carbon dioxide and desulfurization wastewater integrated treatment system of this application includes:
[0026] The carbon dioxide storage component 1, the sodium hydroxide storage component 2, and the absorber 3 are provided, with the outputs of the carbon dioxide storage component 1 and the sodium hydroxide storage component 2 connected to the inlet of the absorber 3.
[0027] The system comprises a four-way valve 4, an electrocatalyst 5, a wastewater treatment component 6, and a mixer 7. The electrocatalyst 5 has a first channel and a second channel. One end of the wastewater treatment component 6 is connected to the first inlet of the mixer 7. The first port of the four-way valve 4 is connected to the outlet of the absorber 3. The second port of the four-way valve 4 is connected to the inlet of the first channel. The third port of the four-way valve 4 is connected to the second inlet of the mixer 7.
[0028] The gas separator 8 and the evaporation crystallization assembly 10 are provided. The inlet of the gas separator 8 is connected to the outlet of the first channel, and the outlet of the gas separator 8 is connected to the fourth port of the four-way valve 4. The evaporation crystallization assembly 10 is connected to the outlet of the second channel. The first port of the four-way valve 4 is connected to the second port, and the third port is connected to the fourth port.
[0029] Specifically, such as Figure 1 As shown, the carbon dioxide storage component 1 is adapted to receive and store captured carbon dioxide, the carbon hydroxide storage component stores sodium hydroxide liquid, and the sodium hydroxide storage component 2 supplies sodium hydroxide solution to the absorber 3. Simultaneously, the absorber 3 is adapted to receive the carbon dioxide fluid from the carbon dioxide storage component 1. The carbon dioxide and sodium hydroxide solution then react in the absorber 3, and the resulting solution sequentially enters the first channel through the first and second ports of the four-way valve 4. It then enters the electrocatalytic reactor.
[0030] Wastewater treatment assembly 6 is adapted to receive desulfurization wastewater, treat the desulfurization wastewater and output it to mixer 7. The liquid at the outlet of the first channel is output to gas separator 8, and gas separator 8 separates the gas and outputs the separated liquid to the fourth port of four-way valve 4. Then the fourth port and the third port are connected, and the diverted liquid is returned to mixer 7 to mix with the treated desulfurization wastewater. Then mixer 7 is adapted to output the liquid to the second channel and then enter the electrocatalytic reactor.
[0031] The evaporation and crystallization assembly 10 is connected to the second channel outlet of the electrocatalyst 5 and is used to evaporate and crystallize the sulfonate solution generated in the reaction to obtain the sulfonate product. The anolyte reaction inside the electrocatalyst is: 4OH⁻ --4e - = 2H₂O + O₂↑
[0032] The cathode reaction is:
[0033] Electrocatalyst 5 can be an existing electrocatalyst 5.
[0034] The electrocatalytic reactor is equipped with an exchange membrane to facilitate the exchange of anions or cations between the liquid in the first channel and the liquid in the second channel, thereby completing the reaction and preparing sulfonate.
[0035] The carbon dioxide and desulfurization wastewater integrated treatment system of this invention reduces equipment footprint and investment costs by integrating carbon dioxide treatment and wastewater treatment into one system. The system treats industrial wastewater and uses a carbon dioxide absorption solution to pass through an electrocatalyst 5 for electrocatalytic reaction and ion exchange to generate sulfonates. This allows for centralized treatment of desulfurization wastewater and carbon dioxide, generating sulfonate products to offset production costs and improve economic efficiency.
[0036] Furthermore, the carbon dioxide storage assembly 1 includes a gas storage tank 11 and a first flow control valve 12. The gas storage tank 11 is connected to one end of the first flow control valve, and the other end of the first flow control valve 12 is connected to the absorber 3. The first flow valve controls the amount of gas output from the gas storage tank 11, thereby improving the stability of the system operation.
[0037] In some embodiments, the wastewater treatment assembly 6 includes a filter 61, a distiller 62, and a concentration meter 63. One end of the filter 61 is connected to a desulfurization wastewater source, and the other end of the filter 61 is connected to the distiller 62. The distiller 62 is equipped with a concentration meter at its outlet, and the outlet of the distiller 62 is connected to the first inlet of the mixer 7.
[0038] Specifically, such as Figure 1 As shown, filter 61 removes suspended solids and insoluble impurities from desulfurization wastewater, such as particulate matter, silt, and gypsum crystals (CaSO4). This prevents solid impurities from scaling, clogging pipes, or damaging equipment in the subsequent distiller 62, which could severely affect distillation efficiency or even cause malfunctions.
[0039] The distiller 62 utilizes the difference in boiling points between water and contaminants (mainly soluble salts) to evaporate water by heating, thereby increasing the concentration of the desired ions.
[0040] A concentration meter 63 is installed at the outlet of the distiller 62 to monitor the concentration of the concentrated liquid discharged from the distiller 62 in real time, such as the concentration of ions to be introduced into the electrocatalytic reactor. By monitoring the concentration, the system can determine whether the distilled liquid, i.e., the concentrate, has reached the predetermined treatment concentration. This avoids the desired ion concentration being too low, which could affect the reaction efficiency of the electrocatalytic reactor and improve the stability of the system operation.
[0041] Furthermore, the evaporation crystallization assembly 10 includes an evaporator crystallizer and a mass spectrometer, the inlet of the evaporator crystallizer is connected to the outlet of the second channel, and the mass spectrometer is provided at the inlet of the evaporator crystallizer.
[0042] Specifically, such as Figure 1 As shown, the evaporator crystallizer receives wastewater from the second channel after the reaction. Through further heating and evaporation, a large amount of water evaporates until the solution reaches a supersaturated state. At this point, the dissolved salts in the water can no longer remain in a dissolved state and begin to precipitate and form solid crystals. This completes the separation of the product and pure water.
[0043] Mass spectrometry can monitor the concentration of ions in the solution discharged from the electrocatalytic reactor, so that the solution can be further processed in subsequent processes.
[0044] The carbon dioxide and desulfurization wastewater integrated treatment system of this application embodiment, by setting up an evaporator crystallizer, achieves the separation of salt and water in the solution discharged in the second channel, and the final products are high-purity distilled water and solid salt. This facilitates water recovery and the preparation of sulfonates.
[0045] In some embodiments, the carbon dioxide and desulfurization wastewater integrated treatment system further includes a power generation component 9 and an energy storage device 20, wherein the output end of the power generation component 9 is connected to the energy storage device 20, and the energy storage device 20 is connected to an electrocatalytic reactor to provide electrical energy.
[0046] The power generation component 9 may include a photovoltaic module, an inverter, a rectifier, and an energy storage device. The photovoltaic module is suitable for converting light energy into electrical energy. The output terminal of the photovoltaic module is connected to the input terminal of the inverter. The output terminal of the inverter is connected to the input terminal of the rectifier. The output terminal of the rectifier is connected to the energy storage device. The energy storage device is suitable for storing direct current. The energy storage device is connected to the electrocatalytic reactor to provide power to the electrocatalytic reactor.
[0047] Furthermore, the integrated treatment system for carbon dioxide and desulfurization wastewater also includes a second flow regulating valve 30. One end of the second flow regulating valve 30 is connected to the outlet of the mixer 7, and the other end is connected to the inlet of the second channel of the electrocatalytic reactor. This facilitates adjustment of the flow rate output from the mixer 7, so that the amount discharged from the absorber 3 into the first channel matches the amount discharged from the mixer 7 into the second channel, thereby improving the stability of the reaction in the electrocatalytic reactor.
[0048] Furthermore, the carbon dioxide and desulfurization wastewater integrated treatment system also includes a third flow regulating valve 40, one end of which is connected to the second inlet of the absorber 3, and the other end of which is connected to the sodium hydroxide storage assembly 2, so as to regulate the amount of sodium hydroxide solution injected into the absorber 3.
[0049] Furthermore, the sodium hydroxide storage assembly 2 includes a storage tank and a transfer pump, wherein the storage tank is connected to the inlet of the transfer pump and the outlet of the transfer pump is connected to the third flow regulating valve 40.
[0050] Furthermore, the carbon dioxide and desulfurization wastewater integrated treatment system also includes a thermometer, which is installed on the mixer 7. The thermometer is used to monitor the temperature of the mixer 7 during operation.
[0051] In some embodiments, the carbon dioxide and desulfurization wastewater integrated treatment system further includes a fourth flow regulating valve 50, one end of which is connected to the inlet of the first channel, and the other end of which is connected to the second port of the four-way valve 4, so as to adjust the output flow of the absorber 3, improve the matching degree of the solution in the first channel and the second channel, and avoid the large difference in the solution volume between the two channels from affecting the reaction efficiency of the electrocatalytic reactor.
[0052] The foregoing has provided a detailed description of the method provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.
Claims
1. A comprehensive treatment system for carbon dioxide and desulfurization wastewater, characterized in that, include: The carbon dioxide storage component (1), the sodium hydroxide storage component (2), and the absorber (3) are provided, wherein the output ends of the carbon dioxide storage component (1) and the sodium hydroxide storage component (2) are connected to the inlet of the absorber (3); The system comprises a four-way valve (4), an electrocatalyst (5), a wastewater treatment assembly (6), and a mixer (7). The electrocatalyst (5) has a first channel and a second channel. One end of the wastewater treatment assembly (6) is connected to the first inlet of the mixer (7). The first port of the four-way valve (4) is connected to the outlet of the absorber (3). The second port of the four-way valve (4) is connected to the inlet of the first channel. The third port of the four-way valve (4) is connected to the second inlet of the mixer (7). The gas separator (8) and the evaporation crystallization assembly (10) are connected, wherein the inlet of the gas separator (8) is connected to the outlet of the first channel, the outlet of the gas separator (8) is connected to the fourth port of the four-way valve (4), and the evaporation crystallization assembly (10) is connected to the outlet of the second channel, wherein the first port of the four-way valve (4) is connected to the second port, and the third port is connected to the fourth port.
2. The carbon dioxide and desulfurization wastewater integrated treatment system according to claim 1, characterized in that, The carbon dioxide storage assembly (1) includes a gas storage tank (11) and a first flow control valve (12). The gas storage tank (11) is connected to one end of the first flow control valve, and the other end of the first flow control valve (12) is connected to the absorber (3).
3. The carbon dioxide and desulfurization wastewater integrated treatment system according to claim 1, characterized in that, The wastewater treatment component (6) includes a filter (61), a distiller (62), and a concentration meter (63). One end of the filter (61) is connected to the desulfurization wastewater source, and the other end of the filter (61) is connected to the distiller (62). The distiller (62) has a concentration meter at its outlet, and the outlet of the distiller (62) is connected to the first inlet of the mixer (7).
4. The carbon dioxide and desulfurization wastewater integrated treatment system according to claim 1, characterized in that, The evaporation crystallization assembly (10) includes an evaporator and a mass spectrometer. The inlet of the evaporator is connected to the outlet of the second channel, and the mass spectrometer is provided at the inlet of the evaporator.
5. The carbon dioxide and desulfurization wastewater integrated treatment system according to claim 1, characterized in that, It also includes a power generation component (9) and an energy storage device (20), the output of which is connected to the energy storage device (20), which is connected to an electrocatalytic reactor to provide electrical energy.
6. The carbon dioxide and desulfurization wastewater integrated treatment system according to claim 1, characterized in that, It also includes a second flow regulating valve (30), one end of which is connected to the outlet of the mixer (7), and the other end of which is connected to the inlet of the second channel of the electrocatalytic reactor.
7. The carbon dioxide and desulfurization wastewater integrated treatment system according to claim 1, characterized in that, It also includes a third flow regulating valve (40), one end of which is connected to the second inlet of the absorber (3), and the other end of which is connected to the sodium hydroxide storage assembly (2).
8. The carbon dioxide and desulfurization wastewater integrated treatment system according to claim 7, characterized in that, The sodium hydroxide storage assembly (2) includes a storage tank and a transfer pump. The storage tank is connected to the inlet of the transfer pump, and the outlet of the transfer pump is connected to the third flow regulating valve (40).
9. The carbon dioxide and desulfurization wastewater integrated treatment system according to claim 1, characterized in that, It also includes a thermometer, which is mounted on the mixer (7).
10. The carbon dioxide and desulfurization wastewater integrated treatment system according to claim 1, characterized in that, It also includes a fourth flow regulating valve (50), one end of which is connected to the inlet of the first channel, and the other end of which is connected to the second port of the four-way valve (4).