Ozone advanced oxidation tail gas recycling device

Abstract

This utility model discloses an ozone advanced oxidation tail gas recovery and utilization device, including an ozone tail gas inlet pipe and a primary purification tower and a secondary purification tower connected in sequence. The rear end of the secondary purification tower is connected to an ozone buffer tank. The primary and secondary purification towers are connected to the ozone tail gas inlet pipe through an ozone circulation pipe. Both the primary and secondary purification towers are connected to sodium hydroxide dosing tanks. This application uses a secondary ozone purification tower to purify the tail gas after ozone catalytic oxidation, recover and utilize the remaining ozone, improve ozone utilization rate, and reduce costs. At the same time, it absorbs the carbon dioxide after catalytic oxidation to produce a high-purity sodium carbonate solution for downstream use as a raw material, achieving waste resource recycling.

Description

Technical Field

[0001] This utility model relates to the field of ozone exhaust gas treatment technology, specifically an ozone advanced oxidation exhaust gas recovery and utilization device. Background Technology

[0002] With rapid economic development, environmental pollution has become increasingly serious, and technologies and equipment for environmental remediation are emerging rapidly. The global scarcity of freshwater resources and the impact of water pollution have increased the importance that governments worldwide place on wastewater treatment.

[0003] Pollutants that contaminate water resources mainly include organic matter, nitrogen, and phosphorus. Among these, organic matter accounts for a large proportion of the total pollution, and there are many types of organic matter, including those that are easily degradable, those that are difficult to degrade, and those that are toxic. In terms of water pollutant treatment, there are many processes for removing organic matter, such as coagulation and sedimentation, aerobic biological technology, anaerobic biological technology, and advanced oxidation technology.

[0004] Advanced oxidation technologies are generally used for the treatment of recalcitrant organic matter, mainly including Fenton oxidation and ozone catalytic oxidation. These two technologies are relatively mature and widely used. Currently, ozone catalytic oxidation is frequently used in the upgrading and renovation of municipal wastewater treatment plants or in the advanced treatment of effluent from newly built plants.

[0005] Ozone catalytic oxidation technology is a highly efficient wastewater treatment technology. Compared to ozone as a standalone oxidant, the hydroxyl radicals (·OH) formed by ozone under the action of a catalyst have a higher reaction rate and stronger oxidizing power with organic matter, capable of oxidizing almost all organic matter. The catalyst can catalyze ozone to directly oxidize organic matter in water into CO2 and H2O, or oxidize and decompose large organic molecules into smaller molecules, making them easier to degrade. It is particularly effective in upgrading municipal wastewater treatment plant effluent, as it can directly oxidize some organic matter into carbon dioxide and water, allowing wastewater treatment plant effluent to meet standards.

[0006] However, there are also some drawbacks during operation, such as: 1. Ozone generation requires a high amount of electricity, thus increasing the cost of ozone. Existing equipment exhaust contains a lot of ozone gas, resulting in serious waste; 2. The stability and catalytic activity of the catalyst are poor; 3. For unused ozone, an ozone destruction device needs to be added. Utility Model Content

[0007] The purpose of this invention is to provide an ozone advanced oxidation tail gas recovery and utilization device to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] An ozone advanced oxidation tail gas recovery and utilization device includes an ozone tail gas inlet pipe and a primary purification tower and a secondary purification tower connected in sequence. An ozone buffer tank is connected to the rear end of the secondary purification tower. The primary purification tower and the secondary purification tower are connected to the ozone tail gas inlet pipe through an ozone circulation pipe.

[0010] Both the primary and secondary purification towers are connected to sodium hydroxide dosing tanks.

[0011] As a further embodiment of this utility model: an air intake fan is provided on the ozone exhaust gas intake pipe, and the ozone circulation pipe is connected to the air intake end of the air intake fan.

[0012] As a further embodiment of this utility model: a first air distribution port is provided at the bottom of the first-stage purification tower, and the first air distribution port is connected to the ozone exhaust gas inlet pipe.

[0013] As a further embodiment of this utility model: a first vent valve is provided at the lower end of the primary purification tower, and the first vent valve is connected to a sodium carbonate solution storage tank through a sodium carbonate collection pipe.

[0014] As a further embodiment of this utility model: a first ozone exhaust pipe is provided at the upper end of the primary purification tower, the first ozone exhaust pipe is connected to the ozone circulation pipe, and a second air distribution port is provided at the bottom of the secondary purification tower, the second air distribution port is connected to the first ozone exhaust pipe.

[0015] As a further embodiment of this utility model: a second vent valve is provided at the lower end of the secondary purification tower, and the second vent valve is connected to a sodium carbonate solution storage tank through a sodium carbonate collection pipe.

[0016] As a further embodiment of this utility model: the sodium carbonate solution storage tank is connected to a sodium carbonate delivery pipe, and a sodium carbonate delivery pump is installed on the sodium carbonate delivery pipe.

[0017] As a further embodiment of this utility model: the upper end of the secondary purification tower is provided with a second ozone exhaust pipe, the second ozone exhaust pipe is connected to the ozone circulation pipe, and the second ozone exhaust pipe is connected to the ozone buffer tank.

[0018] As a further embodiment of this utility model: a pressure gauge is provided at the upper end of the ozone buffer tank, the ozone buffer tank is connected to an ozone exhaust pipe, and an ozone delivery fan is provided on the ozone exhaust pipe.

[0019] As a further embodiment of this utility model: the sodium hydroxide dosing tank is connected to the primary purification tower and the secondary purification tower through a sodium hydroxide dosing pipeline, a first energy dissipation plate is provided at the outlet of the sodium hydroxide dosing pipeline in the primary purification tower, and a second energy dissipation plate is provided at the outlet of the sodium hydroxide dosing pipeline in the secondary purification tower.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. This application uses a two-stage ozone purification tower to purify the tail gas after ozone catalytic oxidation, recover and reuse the remaining ozone, improve ozone utilization rate and reduce costs; at the same time, it absorbs the carbon dioxide after catalytic oxidation to produce a high-purity sodium carbonate solution for downstream use as a raw material, so as to achieve the circular utilization of waste resources.

[0022] 2. The sodium hydroxide solution used in this application has a higher efficiency and larger adsorption capacity than clear lime water in absorbing carbon dioxide, and does not pose a risk of scaling and clogging.

[0023] 3. The ozone intake of this application uses a fan to ensure maximum collection of ozone catalytic oxidation exhaust gas; the purified ozone is transported by a fan to ensure that the amount and pressure of transported ozone meet the usage requirements. Attached Figure Description

[0024] Figure 1 This is a plan view of this embodiment;

[0025] In the diagram: 1-Ozone exhaust gas inlet pipe, 2-Inlet fan, 3-Ozone circulation pipe, 4-First-stage purification tower, 5-Energy dissipation plate, 6-Gas distribution port, 7-Vent valve, 8-First ozone exhaust pipe, 9-Sodium hydroxide dosing pipe, 10-Sodium hydroxide dosing tank, 11-Sodium carbonate collection pipe, 12-Sodium carbonate solution storage tank, 13-Second-stage purification tower, 14-Second ozone exhaust pipe, 15-Ozone buffer tank, 16-Pressure gauge, 17-Ozone exhaust pipe, 18-Ozone conveying fan, 19-Sodium carbonate conveying pipe, 20-Sodium carbonate conveying pump. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1In this embodiment of the present invention, an ozone advanced oxidation tail gas recovery and utilization device includes an ozone tail gas inlet pipe 1, an inlet fan 2 installed on the ozone tail gas inlet pipe 1, a primary purification tower 4 and a secondary purification tower 13 connected in sequence after the ozone tail gas inlet pipe 1, an ozone buffer tank 15 connected to the rear end of the secondary purification tower 13, the primary purification tower 4 and the secondary purification tower 13 being connected to the ozone tail gas inlet pipe 1 through an ozone circulation pipe 3, and the ozone circulation pipe 3 being connected to the air inlet end of the inlet fan 2.

[0028] The first-stage purification tower 4 has a first air distribution port 6 at its bottom, which is connected to the ozone exhaust gas inlet pipe 1. The first ozone exhaust pipe 8 is located at the top of the first-stage purification tower 4, and it is connected to the ozone circulation pipe 3. The second-stage purification tower 13 has a second air distribution port 22 at its bottom, which is connected to the first ozone exhaust pipe 8. The second ozone exhaust pipe 14 is located at the top of the second-stage purification tower 13, and it is connected to the ozone circulation pipe 3. The exhaust pipe 14 is connected to the ozone buffer tank 15. Both the first ozone exhaust pipe 8 and the second ozone exhaust pipe 14 are equipped with pipe valves. The ozone buffer tank 15 is equipped with a pressure gauge 16 at the top. The ozone buffer tank 15 is connected to the ozone exhaust pipe 17. An ozone conveying fan 18 is installed on the ozone exhaust pipe 17. The ozone conveying fan is interlocked with the pressure gauge at the top. The ozone buffer tank collects the purified ozone. When the set pressure value is reached, the conveying fan is activated to send the purified ozone to the front end for ozone catalytic oxidation.

[0029] The first-stage purification tower 4 is equipped with a first vent valve 7 at its lower end. The first vent valve 7 is connected to a sodium carbonate solution storage tank 12 through a sodium carbonate collection pipe 11. The second-stage purification tower 13 is equipped with a second vent valve 23 at its lower end. The second vent valve 23 is connected to a sodium carbonate solution storage tank 12 through a sodium carbonate collection pipe 11. The sodium carbonate solution storage tank 12 is connected to a sodium carbonate delivery pipe 19. A sodium carbonate delivery pump 20 is installed on the sodium carbonate delivery pipe 19.

[0030] Both the primary purification tower 4 and the secondary purification tower 13 are connected to sodium hydroxide dosing tanks 10. The sodium hydroxide dosing tanks are connected to the primary purification tower 4 and the secondary purification tower 13 through sodium hydroxide dosing pipes 9. Valves and dosing pumps are installed on the pipes. A first energy dissipation plate 5 is installed at the outlet of the sodium hydroxide dosing pipe 9 inside the primary purification tower 4, and a second energy dissipation plate 22 is installed at the outlet of the sodium hydroxide dosing pipe 9 inside the secondary purification tower 13.

[0031] In use, the intake fan 2 is interlocked with the pressure gauge at the top of the ozone catalytic oxidation tower. When the pressure reaches the set value, the intake fan 2 is turned on to draw ozone exhaust gas into the ozone exhaust gas intake pipe 1, which then enters the primary purification tower 4. Ozone enters the primary purification tower 4 through the first gas distribution port 6. Sodium hydroxide reagent is added to the primary purification tower 4 through the sodium hydroxide dosing pipe 9, reacting with the carbon dioxide in the ozone-oxidized exhaust gas. The resulting sodium carbonate solution enters the sodium carbonate solution storage tank 12 through the sodium carbonate collection pipe 11. Simultaneously, a first vent valve 7 is installed at the bottom of the ozone exhaust gas purification tower to drain the solution in the tank when necessary. The purified exhaust gas is discharged through the first ozone exhaust pipe 8, with a portion entering the ozone circulation pipe 3. The ozone exhaust gas enters the inlet pipe 1 at the front end, and then passes through the primary purification tower 4 for further purification. A portion of the gas enters the second gas distribution port 22, and then enters the secondary purification tower 13. Sodium hydroxide is added to the secondary purification tower 13 through the sodium hydroxide dosing pipe 9, where it reacts with the carbon dioxide in the ozone-oxidized exhaust gas. The resulting sodium carbonate solution enters the sodium carbonate solution storage tank 12 through the sodium carbonate collection pipe 11. At the same time, a second vent valve 23 is installed at the bottom of the ozone exhaust gas purification tower to drain the solution in the tank when necessary. The purified exhaust gas enters the ozone buffer tank to collect the purified ozone. Meanwhile, the ozone delivery fan installed on the ozone exhaust pipe is interlocked with the pressure gauge on the top of the buffer tank. When the set pressure value is reached, the delivery fan is activated to send the purified ozone to the front end for ozone catalytic oxidation.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An ozone advanced oxidation tail gas recycling device, characterized in that, It includes an ozone exhaust gas inlet pipe (1) and a primary purification tower (4) and a secondary purification tower (13) connected in sequence. The secondary purification tower (13) is connected to an ozone buffer tank (15) at its rear end. The primary purification tower (4) and the secondary purification tower (13) are connected to the ozone exhaust gas inlet pipe (1) through an ozone circulation pipe (3). Both the primary purification tower (4) and the secondary purification tower (13) are connected to a sodium hydroxide dosing tank (10).

2. The ozone advanced oxidation tail gas recycling device according to claim 1, characterized in that, An air intake fan (2) is installed on the ozone exhaust gas intake pipe (1), and the ozone circulation pipe (3) is connected to the air intake end of the air intake fan (2).

3. The ozone advanced oxidation tail gas recycling device according to claim 1, characterized in that, The first gas distribution port (6) is provided at the bottom of the first-stage purification tower (4), and the first gas distribution port (6) is connected to the ozone tail gas inlet pipe (1).

4. The ozone advanced oxidation tail gas recycling device according to claim 1, characterized in that, The first-stage purification tower (4) is equipped with a first vent valve (7) at its lower end. The first vent valve (7) is connected to a sodium carbonate solution storage tank (12) through a sodium carbonate collection pipe (11).

5. The ozone advanced oxidation tail gas recycling device according to claim 1, characterized in that, The first ozone exhaust pipe (8) is provided at the upper end of the first-stage purification tower (4), and the first ozone exhaust pipe (8) is connected to the ozone circulation pipe (3). The second air distribution port (22) is provided at the bottom of the second-stage purification tower (13), and the second air distribution port (22) is connected to the first ozone exhaust pipe (8).

6. The ozone advanced oxidation tail gas recycling device according to claim 1, characterized in that, The lower end of the secondary purification tower (13) is provided with a second vent valve (23), which is connected to a sodium carbonate solution storage tank (12) through a sodium carbonate collection pipe (11).

7. An ozone advanced oxidation tail gas recovery and utilization device according to claim 4 or 6, characterized in that, The sodium carbonate solution storage tank (12) is connected to a sodium carbonate delivery pipe (19), and a sodium carbonate delivery pump (20) is installed on the sodium carbonate delivery pipe (19).

8. The ozone advanced oxidation tail gas recovery and utilization device according to claim 1, characterized in that, The upper end of the secondary purification tower (13) is provided with a second ozone exhaust pipe (14), which is connected to the ozone circulation pipe (3) and the ozone buffer tank (15).

9. The ozone advanced oxidation tail gas recovery and utilization device according to claim 1, characterized in that, The ozone buffer tank (15) is equipped with a pressure gauge (16) at the upper end, and the ozone buffer tank (15) is connected to an ozone exhaust pipe (17), and an ozone delivery fan (18) is installed on the ozone exhaust pipe (17).

10. The ozone advanced oxidation tail gas recovery and utilization device according to claim 1, characterized in that, The sodium hydroxide dosing tank is connected to the primary purification tower (4) and the secondary purification tower (13) via a sodium hydroxide dosing pipe (9). A first energy dissipation plate (5) is installed at the outlet of the sodium hydroxide dosing pipe (9) inside the primary purification tower (4), and a second energy dissipation plate is installed at the outlet of the sodium hydroxide dosing pipe (9) inside the secondary purification tower (13).

Images