Ozone advanced oxidation tail gas recycling device

Abstract

The invention discloses an ozone advanced oxidation tail gas recycling device which comprises an ozone tail gas inlet pipeline, a first-stage purification tower and a second-stage purification tower, the first-stage purification tower and the second-stage purification tower are sequentially connected, the rear end of the second-stage purification tower is connected with an ozone buffer tank, and the first-stage purification tower and the second-stage purification tower are communicated with the ozone tail gas inlet pipeline through an ozone circulating pipeline; the secondary ozone purification tower is adopted to purify tail gas subjected to catalytic ozonation, residual ozone is recycled, the ozone utilization rate is increased, and the cost is reduced; meanwhile, the carbon dioxide subjected to catalytic oxidation is absorbed, a sodium carbonate solution with relatively high purity is generated and is used as a raw material for downstream, and waste resources are recycled.

Description

Technical Field

[0001] The present invention relates to the technical field of ozone tail gas treatment, and specifically to an ozone advanced oxidation tail gas recovery and utilization device. Background Technique

[0002] With the rapid development of the economy, the process technologies and equipment for environmental governance have emerged in an explosive manner. Due to the lack of fresh water resources worldwide and the impact of water pollution, governments of various countries have increased their attention to sewage treatment.

[0003] The pollutants polluting water resources mainly include organic matters, nitrogen, phosphorus, etc. Among them, the total amount of organic matter pollution accounts for a relatively large proportion, and there are many types of organic matters, including easily degradable and difficult-to-degrade ones, as well as those containing toxicity, etc. In the treatment of water pollutants, there are many processes for the removal of organic matters, such as coagulation sedimentation, aerobic biotechnology, anaerobic biotechnology, advanced oxidation technology, etc.

[0004] Advanced oxidation technology is generally used for the treatment of difficult-to-degrade organic matters, mainly including Fenton oxidation, ozone catalytic oxidation, etc. These two technologies are relatively mature and widely used. At present, ozone catalytic oxidation is more applied in the upgrading and reconstruction of municipal sewage treatment plants or the advanced treatment of the tail water of newly built plants.

[0005] Ozone catalytic oxidation technology is an efficient advanced wastewater treatment technology. Compared with ozone as a single oxidant, hydroxyl radicals (·OH) are formed by ozone under the action of a catalyst. The reaction rate with organic matters is higher and the oxidation ability is stronger, and almost all organic matters can be oxidized. The catalyst can catalyze ozone to directly oxidize organic matters in water into CO2 and H2O, or oxidize macromolecular organic matters into small molecules, making them easier to be degraded. Especially in the application of upgrading the tail water of municipal plants, it has a good effect, and a part of organic matters can be directly oxidized into carbon dioxide and water, enabling the sewage treatment plant to meet the discharge standards.

[0006] However, there are also some disadvantages in the operation process, such as: 1. The generation of ozone requires a relatively high power consumption, so the cost of ozone is high. The existing equipment tail gas contains more ozone gas, resulting in serious waste; 2. The stability and catalytic activity of the catalyst are poor; 3. An ozone destruction device needs to be added for the unutilized ozone. Summary of the Invention

[0007] The purpose of the present invention is to provide an ozone advanced oxidation tail gas recovery and utilization device to solve the problems raised in the above background technique.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] An ozone advanced oxidation tail gas recovery and utilization device, comprising an ozone tail gas inlet pipeline and a first purification tower and a second purification tower connected in sequence. A ozone buffer tank is connected to the rear end of the second purification tower. The first purification tower and the second purification tower are communicated with the ozone tail gas inlet pipeline through an ozone circulation pipeline;

[0010] Both the first purification tower and the second purification tower are connected with sodium hydroxide dosing tanks.

[0011] As a further scheme of the present invention: an intake fan is arranged on the ozone tail gas inlet pipeline, and the ozone circulation pipeline is connected to the air inlet end of the intake fan.

[0012] As a further scheme of the present invention: a first air distribution port is arranged at the bottom inside the first purification tower, and the first air distribution port is communicated with the ozone tail gas inlet pipeline.

[0013] As a further scheme of the present invention: a first vent valve is arranged at the lower end of the first purification tower, and the first vent valve is connected to a sodium carbonate solution storage tank through a sodium carbonate collection pipeline.

[0014] As a further scheme of the present invention: a first ozone exhaust pipeline is arranged at the upper end of the first purification tower, and the first ozone exhaust pipeline is communicated with the ozone circulation pipeline. A second air distribution port is arranged at the bottom inside the second purification tower, and the second air distribution port is communicated with the first ozone exhaust pipeline.

[0015] As a further scheme of the present invention: a second vent valve is arranged at the lower end of the second purification tower, and the second vent valve is connected to a sodium carbonate solution storage tank through a sodium carbonate collection pipeline.

[0016] As a further scheme of the present invention: the sodium carbonate solution storage tank is connected with a sodium carbonate delivery pipeline, and a sodium carbonate delivery pump is arranged on the sodium carbonate delivery pipeline.

[0017] As a further scheme of the present invention: a second ozone exhaust pipeline is arranged at the upper end of the second purification tower, and the second ozone exhaust pipeline is communicated with the ozone circulation pipeline. The second ozone exhaust pipeline is communicated with the ozone buffer tank.

[0018] As a further scheme of the present invention: a pressure gauge is arranged at the upper end of the ozone buffer tank. The ozone buffer tank is connected with an ozone exhaust pipeline, and an ozone delivery fan is arranged on the ozone exhaust pipeline.

[0019] As a further solution of the present invention: The sodium hydroxide dosing tank is connected to the first purification tower and the second purification tower through a sodium hydroxide dosing pipeline. A first energy dissipation plate is arranged at the outlet of the sodium hydroxide dosing pipeline located inside the first purification tower, and a second energy dissipation plate is arranged at the outlet of the sodium hydroxide dosing pipeline located inside the second purification tower.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. In this application, a two-stage ozone purification tower is adopted to purify the tail gas after ozone catalytic oxidation, recycle the remaining ozone, improve the ozone utilization rate, and reduce costs; at the same time, the carbon dioxide after catalytic oxidation is absorbed to produce a sodium carbonate solution with a relatively high purity for use as a raw material downstream, achieving the circular utilization of waste resources.

[0022] 2. In this application, using sodium hydroxide solution to absorb carbon dioxide has higher efficiency, larger adsorption capacity than lime water, and there is no risk of scaling and blockage.

[0023] 3. In this application, a fan is used for ozone intake to maximize the collection of ozone catalytic oxidation tail gas; a fan is used to transport the purified ozone, which can ensure that the transported ozone gas volume and pressure meet the usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] In the figure: 1 - ozone tail gas intake pipeline, 2 - intake fan, 3 - ozone circulation pipeline, 4 - first purification tower, 5 - energy dissipation plate, 6 - gas distribution port, 7 - vent valve, 8 - first ozone exhaust pipeline, 9 - sodium hydroxide dosing pipeline, 10 - sodium hydroxide dosing tank, 11 - sodium carbonate collection pipeline, 12 - sodium carbonate solution storage tank, 13 - second purification tower, 14 - second ozone exhaust pipeline, 15 - ozone buffer tank, 16 - pressure gauge, 17 - ozone exhaust pipeline, 18 - ozone delivery fan, 19 - sodium carbonate delivery pipeline, 20 - sodium carbonate delivery pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figure 1, in the embodiments of the present invention, an ozone advanced oxidation tail gas recovery and utilization device includes an ozone tail gas inlet pipeline 1, an intake fan 2 is arranged on the ozone tail gas inlet pipeline 1, a primary purification tower 4 and a secondary purification tower 13 are successively connected behind the ozone tail gas inlet pipeline 1, an ozone buffer tank 15 is connected to the rear end of the secondary purification tower 13, the primary purification tower 4 and the secondary purification tower 13 are communicated with the ozone tail gas inlet pipeline 1 through an ozone circulation pipeline 3, and the ozone circulation pipeline 3 is connected to the air inlet end of the intake fan 2.

[0028] A first gas distribution port 6 is arranged at the bottom inside the primary purification tower 4, the first gas distribution port 6 is communicated with the ozone tail gas inlet pipeline 1, a first ozone exhaust pipeline 8 is arranged at the upper end of the primary purification tower 4, the first ozone exhaust pipeline 8 is communicated with the ozone circulation pipeline 3, a second gas distribution port 22 is arranged at the bottom inside the secondary purification tower 13, the second gas distribution port 22 is communicated with the first ozone exhaust pipeline 8, a second ozone exhaust pipeline 14 is arranged at the upper end of the secondary purification tower 13, the second ozone exhaust pipeline 14 is communicated with the ozone circulation pipeline 3, the second ozone exhaust pipeline 14 is communicated with the ozone buffer tank 15, pipeline valves are arranged on both the first ozone exhaust pipeline 8 and the second ozone exhaust pipeline 14, a pressure gauge 16 is arranged at the upper end of the ozone buffer tank 15, an ozone exhaust pipeline 17 is connected to the ozone buffer tank 15, an ozone delivery fan 18 is arranged on the ozone exhaust pipeline 17, the ozone delivery fan is interlocked with the top pressure gauge, the ozone buffer tank collects the purified ozone, and when the set pressure value is reached, the delivery fan is started to send the purified ozone to the front-end ozone catalytic oxidation for use.

[0029] A first vent valve 7 is arranged at the lower end of the primary purification tower 4, the first vent valve 7 is connected to a sodium carbonate solution storage tank 12 through a sodium carbonate collection pipeline 11, a second vent valve 23 is arranged at the lower end of the secondary purification tower 13, the second vent valve 23 is connected to the sodium carbonate solution storage tank 12 through the sodium carbonate collection pipeline 11, and the sodium carbonate solution storage tank 12 is connected to a sodium carbonate delivery pipeline 19, and a sodium carbonate delivery pump 20 is arranged on the sodium carbonate delivery pipeline 19.

[0030] Both the primary purification tower 4 and the secondary purification tower 13 are connected to a sodium hydroxide dosing tank 10, the sodium hydroxide dosing tank is communicated with the primary purification tower 4 and the secondary purification tower 13 through a sodium hydroxide dosing pipeline 9, valves and dosing pumps are arranged on the pipeline, a first energy dissipation plate 5 is arranged at the outlet of the sodium hydroxide dosing pipeline 9 inside the primary purification tower 4, and a second energy dissipation plate 22 is arranged at the outlet of the sodium hydroxide dosing pipeline 9 inside the secondary purification tower 13.

[0031] When the present invention is in use, the intake fan 2 is interlocked with the pressure gauge at the top of the front ozone catalytic oxidation tower. When the pressure value reaches the set value, the intake fan 2 is turned on to extract the ozone tail gas into the ozone tail gas intake pipe 1, and enters the primary purification tower 4 through the ozone tail gas intake pipe 1. The ozone enters the interior of the primary purification tower 4 through the first gas distribution port 6. The sodium hydroxide agent is added into the interior of the primary purification tower 4 through the sodium hydroxide dosing pipe 9, and reacts with the carbon dioxide in the tail gas after ozone oxidation. The sodium carbonate solution generated by the reaction enters the sodium carbonate solution storage tank 12 through the sodium carbonate collection pipe 11. At the same time, a first emptying valve 7 is provided at the bottom of the ozone tail gas purification tower for emptying the solution in the tank when necessary. The purified waste gas is discharged through the first ozone exhaust pipe 8. Part of it enters the ozone circulation pipe 3 and then enters the ozone tail gas intake pipe 1 at the front end, and is circularly purified through the primary purification tower 4 again. Part of it enters the second gas distribution port 22 and thus enters the interior of the secondary purification tower 13. The sodium hydroxide agent is added into the interior of the secondary purification tower 13 through the sodium hydroxide dosing pipe 9, and reacts with the carbon dioxide in the tail gas after ozone oxidation. The sodium carbonate solution generated by the reaction enters the sodium carbonate solution storage tank 12 through the sodium carbonate collection pipe 11. At the same time, a second emptying valve 23 is provided at the bottom of the ozone tail gas purification tower for emptying the solution in the tank when necessary. The purified waste gas enters the ozone buffer tank to collect the purified ozone. At the same time, the ozone delivery fan provided on the ozone exhaust pipe is interlocked with the pressure gauge at the top of the buffer tank. When the set pressure value is reached, the delivery fan is started to send the purified ozone to the front ozone catalytic oxidation for use.

[0032] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0033] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard 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 recovery and utilization device, characterized in that, It includes an ozone tail gas inlet pipe (1) and a primary purification tower (4) and a secondary purification tower (13) connected in sequence. The rear end of the secondary purification tower (13) is connected with an ozone buffer tank (15). The primary purification tower (4) and the secondary purification tower (13) are communicated with the ozone tail gas inlet pipe (1) through an ozone circulation pipe (3). Both the primary purification tower (4) and the secondary purification tower (13) are connected with a sodium hydroxide dosing tank (10).

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

3. The ozone advanced oxidation tail gas recovery and utilization device according to claim 1, characterized in that, A first gas distribution port (6) is arranged at the inner bottom of the primary purification tower (4), and the first gas distribution port (6) is communicated with the ozone tail gas inlet pipe (1).

4. An ozone advanced oxidation tail gas recovery and utilization device according to claim 1, characterized in that, A first vent valve (7) is arranged at the lower end of the primary purification tower (4), and the first vent valve (7) is connected with a sodium carbonate solution storage tank (12) through a sodium carbonate collection pipe (11).

5. An ozone advanced oxidation tail gas recovery and utilization device according to claim 1, characterized in that, A first ozone exhaust pipe (8) is arranged at the upper end of the primary purification tower (4), and the first ozone exhaust pipe (8) is communicated with the ozone circulation pipe (3). A second gas distribution port (22) is arranged at the inner bottom of the secondary purification tower (13), and the second gas distribution port (22) is communicated with the first ozone exhaust pipe (8).

6. The ozone advanced oxidation tail gas recovery and utilization device according to claim 1, characterized in that, A second vent valve (23) is arranged at the lower end of the secondary purification tower (13), and the second vent valve (23) is connected with 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 with a sodium carbonate delivery pipe (19), and a sodium carbonate delivery pump (20) is arranged on the sodium carbonate delivery pipe (19).

8. The ozone advanced oxidation tail gas recycling device according to claim 1, characterized in that, A second ozone exhaust pipe (14) is arranged at the upper end of the secondary purification tower (13), and the second ozone exhaust pipe (14) is communicated with the ozone circulation pipe (3). The second ozone exhaust pipe (14) is communicated with the ozone buffer tank (15).

9. The ozone advanced oxidation tail gas recovery and utilization device according to claim 1, characterized in that, A pressure gauge (16) is arranged at the upper end of the ozone buffer tank (15), and the ozone buffer tank (15) is connected with an ozone exhaust pipe (17). An ozone delivery fan (18) is arranged 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 communicated with the primary purification tower (4) and the secondary purification tower (13) through a sodium hydroxide dosing pipe (9). A first energy dissipation plate (5) is arranged at the outlet of the sodium hydroxide dosing pipe (9) located in the primary purification tower (4), and a second energy dissipation plate (22) is arranged at the outlet of the sodium hydroxide dosing pipe (9) located in the secondary purification tower (13).

Images