Device for treating waste gas by electrolyzing saline solution
By constructing a device consisting of components such as a sodium hypochlorite electrolyzer and a reaction tower, the high cost problem caused by the instability of sodium hypochlorite was solved, and stable treatment of nitrogen oxides and low cost were achieved.
Patent Information
- Application Number
- CN202422649150.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-10-30
AI Technical Summary
Existing technologies are difficult to effectively treat nitrogen oxide emissions, especially in industrial emissions and vehicle exhaust. Furthermore, sodium hypochlorite is prone to photodegradation and pyrolysis, leading to high and unstable treatment costs.
Sodium hypochlorite solution is prepared by electrolyzing brine without a diaphragm. The device consists of a sodium hypochlorite electrolyzer, a seawater pretreatment unit, a water replenishment unit, a gas-liquid separator, and a reaction tower. The ratio of waste gas to sodium hypochlorite is controlled, and the strong oxidizing property of sodium hypochlorite is used to oxidize nitrogen oxides into nitrate ions.
It achieves stable and low-cost nitrogen oxide treatment, reduces operating costs, and ensures the stability of treatment results.
Smart Images
Figure CN223615669U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of devices for treating waste gas by electrolyzing brine, and in particular to a device for treating waste gas by electrolyzing brine. Background Technology
[0002] Nitrogen oxides, such as NO and NO2, are common air pollutants. They have significant impacts on the environment and human health. They are key components in the formation of acid rain and photochemical smog, irritate and corrode lung tissue, and long-term inhalation can lead to serious health problems. Nitrogen oxides mainly enter the atmosphere through industrial emissions and vehicle exhaust.
[0003] NaClO is an effective oxidant for removing nitrogen oxides, with the common reaction site being 3ClO. - +2NO + H₂O = 2H₂ + +2NO 3- +3Cl - Electrolysis of brine is a common method for producing NaClO. Because NaClO is easily photolyzed, pyrolyzed, and unstable, using a NaClO generator for on-the-spot production is safe, reliable, and has low operating costs. It is widely used in the tap water industry, hospital wastewater disinfection, circulating cooling water treatment, swimming pool water disinfection, and greywater treatment. The NaClO solution is prepared by diaphragm-free electrolysis of NaCl. At the anode, chloride ion oxidation occurs to produce chlorine gas, and at the cathode, hydrogen ion reduction occurs to produce hydrogen gas. The OH- in the solution... - It reacts with chlorine gas to produce ClO. - The specific chemical reactions are as follows: Anode reaction: 2Cl - →Cl2+2e-; Cathode reaction: 2H2O+2e-→2OH- - Chemical reaction between electrodes: Cl₂ + 2OH⁻ → ClO₂ - +Cl - +H2O, then ClO - +H₂O→HClO+OH - The overall reaction is: NaCl + H₂O → NaClO + H₂↑. A device for treating waste gas by electrolyzing brine is needed to achieve stable and effective treatment of nitrogen oxides using sodium hypochlorite. Utility Model Content
[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this utility model provides a device for treating waste gas by electrolyzing brine.
[0005] This utility model provides a device for treating waste gas by electrolyzing brine, comprising: a sodium hypochlorite electrolytic cell, wherein the sodium hypochlorite electrolytic cell is electrically connected to an electrolysis power supply;
[0006] The sodium hypochlorite electrolytic cell is connected to the seawater pretreatment unit and the water replenishment unit via a feed valve;
[0007] The sodium hypochlorite electrolytic cell is connected to a gas-liquid separator via a discharge valve.
[0008] The liquid outlet of the gas-liquid separator is connected to a sodium hypochlorite regulating and supply mechanism, which is connected to a reaction tower. The reaction tower is connected to a waste gas buffer chamber. An airflow regulating valve is installed on the pipeline between the waste gas buffer chamber and the reaction tower. A compressor fan is installed at the inlet of the waste gas buffer chamber.
[0009] Furthermore, the seawater pretreatment mechanism includes: a water pump connected to a seawater reaction filter, the seawater reaction filter connected to a concentration adjustment tank, the outlet of the concentration adjustment tank connected to the inlet of a brine pressurization pump; the outlet of the brine pressurization pump connected to a first check valve, the first check valve connected to the sodium hypochlorite electrolyzer via a pipeline, the first check valve allowing brine to flow from the brine pressurization pump to the sodium hypochlorite electrolyzer.
[0010] Furthermore, a stirring mechanism and a pH sensor are installed inside the concentration adjustment tank, and a first conductivity sensor is installed downstream of the concentration adjustment tank.
[0011] Furthermore, the water replenishment mechanism includes: a water tank, a water replenishment valve at the outlet of the water tank, the water replenishment valve being connected to a first flow regulating valve via a pipeline, a first flow meter in the downstream pipeline of the first flow regulating valve, a second check valve connected downstream of the first flow meter, the second check valve being connected to the sodium hypochlorite electrolysis cell, and the second check valve allowing water to flow from the water tank to the sodium hypochlorite electrolysis cell.
[0012] Furthermore, the sodium hypochlorite regulating and supply mechanism includes: a sodium hypochlorite storage tank, the inlet of which is connected to the liquid outlet of the gas-liquid separator, the outlet of which is connected to a transfer pump, the transfer pump being connected to a second flow regulating valve, a second flow meter being installed on a pipeline downstream of the second flow regulating valve, and the reaction tower being connected downstream of the second flow regulating valve.
[0013] Furthermore, the reaction tower is equipped with a porous structure to ensure sufficient contact between the gas and the liquid. The sodium hypochlorite solution flows downward through the porous structure, and the waste gas flows upward through the porous structure. An exhaust port is provided at the top of the reaction tower, and a drain port is provided at the bottom of the reaction tower.
[0014] Furthermore, the exhaust port of the reaction tower is connected to a three-way selector valve via a pipeline. One outlet of the three-way selector valve is used for exhaust, and the other outlet is connected back to the inlet of the reaction tower via a pipeline. A gas sensor for detecting nitrogen oxide exhaust gas is installed between the reaction tower and the inlet of the three-way selector valve.
[0015] The technical solution provided by this utility model embodiment has the following advantages compared with the prior art:
[0016] This application's sodium hypochlorite electrolytic cell is connected to a seawater pretreatment unit and a water replenishment unit via a feed valve. The seawater pretreatment unit provides the raw material for the electrolytic preparation of sodium hypochlorite, reducing costs. The sodium hypochlorite electrolytic cell is connected to a gas-liquid separator via a discharge valve. The liquid outlet of the gas-liquid separator is connected to a sodium hypochlorite regulating and supplying unit, which is connected to a reaction tower. The reaction tower is connected to a waste gas buffer chamber. An airflow regulating valve is installed on the pipeline between the waste gas buffer chamber and the reaction tower, and a compressor fan is installed at the inlet of the waste gas buffer chamber. The waste gas buffer chamber acts as a buffer container, stabilizing the supply of waste gas within the reaction tower. The sodium hypochlorite regulating and supplying unit supports the regulation of the sodium hypochlorite solution supply. In summary, this application can stably control the ratio of waste gas to sodium hypochlorite, utilizing the strong oxidizing properties of sodium hypochlorite to oxidize nitrogen oxides in the waste gas into nitrate ions, thereby achieving waste gas treatment. Attached Figure Description
[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.
[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of an apparatus for treating waste gas by electrolyzing brine, as provided by this utility model.
[0020] Figure 2 This is a schematic diagram of another device for treating waste gas by electrolyzing brine provided by this utility model.
[0021] The labels and their meanings in the diagram are as follows:
[0022] 1. Sodium hypochlorite electrolytic cell; 11. Feed valve; 12. Discharge valve;
[0023] 2. Seawater pretreatment mechanism; 21. Water pump; 22. Seawater reaction filter; 23. Concentration adjustment tank; 24. pH sensor; 25. Brine pressurization pump; 26. First check valve; 27. First conductivity sensor.
[0024] 3. Water supply mechanism; 31. Water tank; 32. Water supply valve; 33. First flow regulating valve; 34. First flow meter; 35. Second check valve;
[0025] 4. Gas-liquid separator;
[0026] 5. Sodium hypochlorite regulating and supply mechanism; 51. Sodium hypochlorite storage tank; 52. Transfer pump; 53. Second flow regulating valve; 54. Second flow meter.
[0027] 6. Electrolysis power source;
[0028] 7. Reaction tower; 71. Porous structure; 72. Three-way selector valve; 73. Gas sensor;
[0029] 8. Exhaust gas buffer chamber; 81. Compressor fan. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0031] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0032] See Figure 1 As shown, this utility model embodiment provides an apparatus for treating waste gas by electrolyzing brine, comprising:
[0033] Sodium hypochlorite electrolytic cell 1, wherein the sodium hypochlorite electrolytic cell 1 is electrically connected to the electrolytic power supply 6.
[0034] The sodium hypochlorite electrolysis cell 1 is connected to the feed valve 11 and the discharge valve 12. The feed valve 11 is connected to the seawater pretreatment mechanism 2 and the water replenishment mechanism 3.
[0035] In the specific implementation process, the seawater pretreatment unit 2 is used to provide electrolytic brine. The seawater pretreatment unit 2 includes a water pump 21, which is connected to a seawater reaction filter 22. Sodium carbonate precipitant is added to the seawater reaction filter 22, and some calcium and magnesium ions are precipitated by carbonate ions. The precipitate is filtered out by the seawater reaction filter. Most of the calcium and magnesium ions are removed by reaction precipitation, reducing the deposition of calcium and magnesium ions during subsequent electrolysis. The seawater reaction filter 22 is connected to a concentration adjustment tank 23. The concentration adjustment tank 23 is equipped with a stirring mechanism and a pH sensor. The concentration of NaCl in seawater is low, resulting in a low yield of sodium hypochlorite produced by electrolysis. During the pretreatment process, NaCl is added to the concentration adjustment tank 23 until the conductivity of the seawater reaches a set threshold. Since seawater is used and pre-precipitated, the pH needs to be monitored to ensure that the pH is between 7 and 7.5 to guarantee the efficiency of sodium hypochlorite production by electrolysis. The outlet of the concentration regulating tank 23 is connected to the inlet of the brine pressurizing pump 25; the outlet of the brine pressurizing pump 25 is connected to a first one-way valve 26, which is connected to the feed valve 11 via a pipeline, allowing brine to flow from the brine pressurizing pump to the feed valve 11. A first conductivity sensor 27 is installed downstream of the concentration regulating tank 23 to detect the conductivity of the supplied salted seawater, ensuring that the concentration of the electrolysis feedstock meets the standard.
[0036] The water replenishment mechanism 3 is used to replenish water during the electrolysis process. Specifically, the water replenishment mechanism 3 includes: a water tank 31, a water replenishment valve 32 installed at the outlet of the water tank 31, the water replenishment valve 32 being connected to a first flow regulating valve 33 via a pipeline, a first flow meter 34 being connected downstream of the first flow regulating valve 33, and a second check valve 35 being connected downstream of the first flow meter 34. The second check valve 35 is connected to the feed valve 11, allowing water to flow from the water tank to the feed valve 11. During the water replenishment process, the water replenishment valve 32 is open, and the flow rate of the replenished water is adjusted by the first flow regulating valve.
[0037] The discharge valve 12 is connected to the inlet of the gas-liquid separator 4, and the liquid outlet of the gas-liquid separator 4 is connected to the sodium hypochlorite regulating and supply mechanism 5; the generated hydrogen and liquid are separated by the gas-liquid separator 4. The sodium hypochlorite regulating and supply mechanism 5 supports the regulation of the supply of sodium hypochlorite solution, and the sodium hypochlorite regulating and supply mechanism 5 is connected to the reaction tower 7, which is connected to the waste gas source.
[0038] In the specific implementation process, the sodium hypochlorite regulating and supply mechanism 5 includes: a sodium hypochlorite storage tank 51, the inlet of which is connected to the liquid outlet of the gas-liquid separator 4, the outlet of which is connected to a transfer pump 52, the transfer pump being connected to a second flow regulating valve 53, a second flow meter 54 being installed on the pipeline downstream of the second flow regulating valve 53, and a reaction tower 7 being connected downstream of the second flow regulating valve 53. The reaction tower 7 is provided with a porous structure 71 inside to ensure sufficient contact between the gas and the liquid. The sodium hypochlorite solution flows downward through the porous structure 71, and the waste gas flows upward through the porous structure 71. The porous structure ensures sufficient contact between the sodium hypochlorite solution and the waste gas. An exhaust port is provided at the top of the reaction tower 7, and a drain port is provided at the bottom of the reaction tower 7. The waste gas buffer chamber 8 is connected to the reaction tower 7 at a position below the porous structure and above the drain outlet. An airflow regulating valve 82 is installed on the pipeline between the waste gas buffer chamber 8 and the reaction tower 7. A compressor fan 81 is installed at the inlet of the waste gas buffer chamber 8. The compressor fan 81 delivers waste gas to the waste gas buffer chamber 8. The waste gas buffer chamber 8 serves as a buffer container to stabilize the waste gas supply in the reaction tower 7.
[0039] like Figure 2 As shown, the exhaust port of the reaction tower 7 is connected to a three-way selector valve 72 via a pipeline. One outlet of the three-way selector valve 72 is used for exhaust, and the other outlet is connected back to the inlet of the reaction tower 7 via a pipeline. A gas sensor 73 for detecting nitrogen oxide exhaust gas is installed between the reaction tower 7 and the inlet of the three-way selector valve 72. When the exhaust gas concentration does not meet the standard, the three-way selector valve 72 guides the exhaust gas back into the reaction tower 7 to continue the reaction. When the concentration meets the standard, the three-way selector valve 72 discharges the gas.
[0040] In the embodiments provided by this utility model, it should be understood that the disclosed structure can be implemented in other ways. For example, the structural embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, structures, or units, and may be electrical, mechanical, or other forms.
[0041] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0042] Furthermore, in the various embodiments of this utility model, the functional units can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.
[0043] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A device for treating waste gas by electrolyzing brine, characterized in that, include: Sodium hypochlorite electrolytic cell (1), wherein the sodium hypochlorite electrolytic cell (1) is electrically connected to an electrolysis power supply (6); The sodium hypochlorite electrolytic cell (1) is connected to the seawater pretreatment unit (2) and the water replenishment unit (3) through the feed valve (11); The sodium hypochlorite electrolytic cell (1) is connected to the gas-liquid separator (4) through the discharge valve (12); The liquid outlet of the gas-liquid separator (4) is connected to the sodium hypochlorite regulating and supply mechanism (5), which is connected to the reaction tower (7). The reaction tower (7) is connected to the waste gas buffer chamber (8). An airflow regulating valve (82) is installed on the pipeline between the waste gas buffer chamber (8) and the reaction tower (7). A compressor fan (81) is installed at the inlet of the waste gas buffer chamber (8).
2. The apparatus for treating waste gas by electrolysis of brine according to claim 1, characterized in that, The seawater pretreatment mechanism (2) includes: a water pump (21), which is connected to a seawater reaction filter (22), which is connected to a concentration adjustment tank (23), the outlet of which is connected to the inlet of a brine pressurizing pump (25); the outlet of the brine pressurizing pump (25) is connected to a first check valve (26), which is connected to the sodium hypochlorite electrolyzer (1) via a pipeline, and the first check valve (26) allows brine to flow from the brine pressurizing pump to the sodium hypochlorite electrolyzer.
3. The apparatus for treating waste gas by electrolyzing brine according to claim 2, characterized in that, The concentration adjustment tank (23) is equipped with a stirring mechanism and a pH sensor, and a first conductivity sensor (27) is installed downstream of the concentration adjustment tank (23).
4. The apparatus for treating waste gas by electrolyzing brine according to claim 1, characterized in that, The water replenishment mechanism (3) includes: a water tank (31), a water replenishment valve (32) installed at the outlet of the water tank (31), the water replenishment valve (32) being connected to a first flow regulating valve (33) via a pipeline, a first flow meter (34) on the downstream pipeline of the first flow regulating valve (33), a second check valve (35) being connected downstream of the first flow meter (34), the second check valve (35) being connected to the sodium hypochlorite electrolysis cell (1), and the second check valve (35) allowing water to flow from the water tank to the sodium hypochlorite electrolysis cell.
5. The apparatus for treating waste gas by electrolysis of brine according to claim 1, characterized in that, The sodium hypochlorite regulating and supply mechanism (5) includes: a sodium hypochlorite storage tank (51), the inlet of which is connected to the liquid outlet of the gas-liquid separator (4), the outlet of which is connected to a transfer pump (52), the transfer pump (52) being connected to a second flow regulating valve (53), a second flow meter (54) being installed on the pipeline downstream of the second flow regulating valve (53), and the downstream of the second flow regulating valve (53) being connected to the reaction tower (7).
6. The apparatus for treating waste gas by electrolysis of brine according to claim 1, characterized in that, The reaction tower (7) is provided with a porous structure (71) to ensure full contact between gas and liquid. Sodium hypochlorite solution flows downward through the porous structure (71), and waste gas flows upward through the porous structure (71). An exhaust port is provided at the top of the reaction tower (7), and a drain port is provided at the bottom of the reaction tower (7).
7. The apparatus for treating waste gas by electrolyzing brine according to claim 6, characterized in that, The exhaust port of the reaction tower (7) is connected to a three-way selector valve (72) via a pipeline. One outlet of the three-way selector valve (72) is used for exhaust, and the other outlet is connected back to the inlet of the reaction tower (7) via a pipeline. A gas sensor (73) for detecting nitrogen oxide exhaust gas is installed between the reaction tower (7) and the inlet of the three-way selector valve (72).