Radioactive waste oil purification treatment device and method

Abstract

The invention relates to a radioactive waste oil purification treatment device and method.The device comprises an oxidation aging unit and a circulating filtering unit communicated with the oxidation aging unit through a feed liquid pipeline, the circulating filtering unit comprises a static settling tank and a circulating filtering tank communicated with the static settling tank through an injection pipeline, and the circulating filtering tank is communicated with the oxidation aging unit through a feed liquid pipeline. The oil liquid receiver is communicated with the circulating filtering tank through an emptying pipeline, the circulating filtering pipeline is communicated with the injection pipeline and the emptying pipeline, and an oil pump, a filtering unit, a one-way valve and a filtering unit are sequentially arranged on the circulating filtering pipeline in the material liquid flowing direction. A combined treatment method of oxidation aging and circulating filtration is adopted, copper powder is selected as a catalyst, efficient treatment of radioactive waste oil can be achieved, a tail gas treatment system is uniquely designed, and tail gas can be directly discharged. The device is simple in structure, convenient to operate and suitable for industrial application.

Description

Technical Field

[0001] The invention belongs to the technical field of radioactive waste oil purification and treatment, and in particular relates to a radioactive waste oil purification and treatment device and method. Background Art

[0002] Radioactive waste oil is one of the organic "difficult wastes" generated by the operation and maintenance of nuclear facilities. It contains a small amount of β and γ radionuclides and activation products such as strontium, cesium, cobalt, etc., which are mostly in mixed form and have the characteristics of small amount and dispersed distribution. Although the annual output and activity concentration of radioactive waste oil are low, its stock is gradually increasing with the increase of temporary storage years, which has caused great pressure on the storage capacity of temporary storage. At the same time, due to the flammability, explosiveness, chemical toxicity and corrosiveness of waste oil itself, it is one of the safety hazards and can no longer meet the requirements of safety supervision and sustainable development.

[0003] At present, the research on the purification of radioactive waste oil by relevant domestic research institutions mainly focuses on incineration and adsorption-solidification. Although the incineration method has high treatment efficiency, it requires the establishment of special treatment facilities, with high equipment investment costs and difficult procedures for approval. The volume increase ratio of waste oil treated by the adsorption-solidification method is large, which does not meet the principle of waste minimization. In addition, my country has little research and development on adsorbents, and almost all the adsorbents used in current research are American products. Therefore, the above two purification treatment methods remain in the laboratory stage, and there are no public reports on engineering applications.

[0004] Therefore, it is extremely important to provide a device and method that can be quickly industrialized and can efficiently and effectively purify and treat radioactive waste oil, so as to achieve the purification of radioactive nuclides in waste oil, make the treated waste oil meet the requirements of clean clearance, achieve the goals of clean clearance and minimization of radioactive waste, and avoid environmental pollution. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects in the prior art and provide a radioactive waste oil purification device and method, which can efficiently and effectively purify and treat radioactive waste oil and is convenient for industrial application.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A radioactive waste oil purification treatment device comprises an oxidation aging unit, a static sedimentation tank connected to the oxidation aging unit through a feed liquid pipeline, and a circulation filtration unit connected to the static sedimentation tank, wherein the circulation filtration unit comprises a circulation filtration tank connected to the static sedimentation tank through an injection pipeline, an oil receiver connected to the circulation filtration tank through an emptying pipeline, and a circulation filtration pipeline connected to the injection pipeline and the emptying pipeline, and an oil pump, a filter unit, a one-way valve, and a filter unit are sequentially arranged on the circulation filtration pipeline according to the flow direction of the feed liquid.

[0008] As a further technical solution, an oil pump is provided on the liquid feed pipeline.

[0009] As a further technical solution, the top of the oxidation aging unit is also connected to the feed liquid pipeline through a first connecting pipe.

[0010] As a further technical solution, the oxidation aging unit includes a first tank body, a first stirring device and a temperature sensor arranged in the first tank body, a first heating device arranged on the first tank body, and an air injection port, a smoke outlet, a liquid feed inlet, and a discharge main pipe, wherein the discharge main pipe is further provided with a discharge port, and the air injection port is connected to an air compression system through an air injection pipeline; the discharge main pipe is connected to the static sedimentation tank through the liquid feed pipeline;

[0011] The discharge port and the discharge main pipe are both provided with first valves on both sides of the discharge port.

[0012] As a further technical solution, an exhaust gas purification system is also included.

[0013] As a further technical solution, the exhaust gas purification system includes a flue gas purification pipeline arranged at the flue gas outlet of the oxidation aging unit; an air cooler, a flue gas purification unit, a condensed liquid tank and a liquid outlet arranged on the flue gas purification pipeline in sequence according to the flow direction of the oil mist; the flue gas purification unit is arranged between the air cooler and the condensed liquid tank through a flue gas branch pipe.

[0014] As a further technical solution, the flue gas purification unit includes an electrostatic oil mist purifier and a photo-oxygen activated carbon deodorizer which are connected in sequence, a flue gas inlet and a condensate outlet are arranged on the electrostatic oil mist purifier, and a purified gas outlet is arranged on the photo-oxygen activated carbon deodorizer; the flue gas inlet and the condensate outlet are connected to the flue gas branch pipe.

[0015] As a further technical solution, a second valve is provided on the liquid accumulation outlet.

[0016] As a further technical solution, the filter unit adopts a primary filter, a secondary filter and a tertiary filter which are arranged in series in sequence, and the primary filter, the secondary filter and the tertiary filter are all provided with exhaust ports.

[0017] As a further technical solution, the circulating filter tank includes a second tank body, a second stirring device arranged in the second tank body, a second heating device arranged on the side wall of the second tank body, and a respirator arranged on the top of the second tank body.

[0018] As a further technical solution, the bottom of the static sedimentation tank is a conical sedimentation area, a sedimentation discharge pipe is provided at the bottom of the conical sedimentation area, and a viewing window and a sewage valve are provided on the sedimentation discharge pipe.

[0019] As a further technical solution, one end of the injection pipe passes through the top of the static sedimentation tank and extends to the interior of the static sedimentation tank, and the other end is connected to the feed port of the circulating filter tank.

[0020] As a further technical solution, the circulating filtration pipeline is provided with sampling ports both upstream and downstream of the filtration unit and on the injection pipeline.

[0021] A method for purifying radioactive waste oil comprises the following steps:

[0022] The radioactive waste oil is injected into the first tank of the oxidation aging unit, catalyst copper powder is added to the first tank, and the feed liquid is heated to 150° C. to 160° C., and compressed air is introduced at the same time, and oxidation aging is performed under the action of the catalyst copper powder, heating and oxygen to produce oil sludge;

[0023] After the oxidation aging is completed, the liquid containing copper powder and oil sludge is injected into the static sedimentation tank under the action of the oil pump. In the static sedimentation tank, the copper powder and oil sludge are settled to the bottom of the static sedimentation tank, and the waste oil on the upper part of the static sedimentation tank enters the circulation filtration unit through the circulation filtration pipe 9. After several cycles of filtration in the circulation filtration unit, it is finally discharged into the oil receiver.

[0024] As a further technical solution, during the oxidation aging process, the exhaust gas purification system is turned on. After the flue gas from the oxidation aging unit enters the flue gas purification pipeline under the action of the air cooler, it is first cooled by the air cooler, and the condensed liquid enters the condensation liquid tank. The uncondensed exhaust gas enters the electrostatic oil mist purifier to remove the oil mist in the flue gas, and then the flue gas after the oil mist is removed is deodorized by the photo-oxidation activated carbon deodorizer and discharged; the oil mist discharged from the electrostatic oil mist purifier enters the condensation liquid tank with the condensate and is finally discharged.

[0025] As a further technical solution, the oxidation aging time is 12 hours.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention adopts a combined treatment method of oxidation aging + circulation filtration, selects copper powder as a catalyst, can achieve efficient treatment of radioactive waste oil, and has a unique design for the tail gas treatment system, so that the tail gas can be directly discharged. The present invention has a simple structure, is easy to operate, and is suitable for industrial application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of a radioactive waste oil purification device in one embodiment of the present invention;

[0029] In the figure: 1, oxidation aging unit, 2, circulation filtration unit, 3, liquid pipeline, 4, static sedimentation tank, 5, injection pipeline, 6, circulation filter tank, 7, emptying pipeline, 8, oil receiver, 9, circulation filtration pipeline, 10, oil pump, 11, primary filter, 12, secondary filter, 13, tertiary filter, 14, one-way valve, 15, sampling port, 16, oil pump, 17, first connecting pipe, 18, first tank body, 19, first stirring device, 20, temperature sensor, 21, first heating device, 22, liquid inlet, 23, discharge main pipe, 24, discharge port, 25, gas injection pipeline, 26. Air compression system; 27. First valve; 28. Waste gas purification system; 29. ​​Flue gas purification pipeline; 30. Air cooler; 31. Electrostatic oil mist purifier; 32. Photo-oxygen activated carbon deodorizer; 33. Condensate accumulation tank; 34. Accumulated liquid outlet; 35. Flue gas branch pipe; 36. Purified gas outlet; 37. Fifth valve; 38. Second valve; 39. Exhaust port; 40. Second tank body; 41. Second stirring device; 42. Second heating device; 43. Respirator; 44. Conical sedimentation area; 45. Sedimentation discharge pipe; 46. Window; 47. Drain valve; 48. Third valve; 49. Fourth valve. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The present invention is described in further detail below with reference to the accompanying drawings.

[0034] Example 1

[0035] like Figure 1 An embodiment of a radioactive waste oil purification treatment device of the present invention is shown, comprising an oxidation aging unit 1, a static sedimentation tank 4 connected to the oxidation aging unit 1, and a circulation filtration unit 2 connected to the static sedimentation tank 4, wherein the circulation filtration unit 2 comprises a circulation filtration tank 6 connected to the static sedimentation tank 4 through an injection pipe 5, an oil receiver 8 connected to the circulation filtration tank 6 through an emptying pipe 7, and a circulation filtration pipe 9 connecting the injection pipe 5 and the emptying pipe 7, and the circulation filtration pipe 9 is provided with an oil pump 10, a filter unit, a one-way valve 14, and a filter unit in sequence according to the flow direction of the feed liquid. The invention adopts a combined treatment method of oxidation aging + circulation filtration to achieve efficient treatment of radioactive waste oil.

[0036] As an embodiment of a radioactive waste oil purification treatment device of the present invention, an oil pump 16 is provided on the feed liquid pipeline 3 .

[0037] As an embodiment of a radioactive waste oil purification treatment device of the present invention, the top of the oxidation aging unit 1 is also connected to the feed liquid pipeline 3 through a first connecting pipe 17 .

[0038] As an embodiment of a radioactive waste oil purification treatment device of the present invention, the oxidation aging unit 1 includes a first tank body 18, a first stirring device 19 and a temperature sensor 20 arranged in the first tank body 18, a first heating device 21 arranged on the first tank body 18, and an air injection port, a flue gas outlet, a liquid feed inlet 22, and a discharge main pipe 23, wherein the discharge main pipe 23 is further provided with a discharge port 24, and the air injection port is connected to an air compression system 26 through an air injection pipeline 25; the discharge main pipe 23 is connected to the static sedimentation tank 4 through the liquid feed pipeline 3;

[0039] The discharge port 24 and the discharge main pipe 23 are both provided with first valves 27 on both sides of the discharge port 24 .

[0040] As an embodiment of a radioactive waste oil purification treatment device of the present invention, it also includes a waste gas purification system 28.

[0041] As an embodiment of a radioactive waste oil purification treatment device of the present invention, the exhaust gas purification system 28 includes a flue gas purification pipeline 29 arranged at the flue gas outlet of the oxidative aging unit 1; an air cooler 30, a flue gas purification unit, a condensed liquid tank 33 and a liquid outlet 34 arranged on the flue gas purification pipeline 29 in sequence according to the flow direction of the oil mist; the flue gas purification unit is arranged between the air cooler 30 and the condensed liquid tank 33 through a flue gas branch pipe 35.

[0042] As an embodiment of a radioactive waste oil purification treatment device of the present invention, the flue gas purification unit includes an electrostatic oil mist purifier 31 and a photo-oxygen activated carbon deodorizer 32 which are connected in sequence, a flue gas inlet and a condensate outlet arranged on the electrostatic oil mist purifier 31, and a purified gas outlet 36 arranged on the photo-oxygen activated carbon deodorizer 32; the flue gas inlet and the condensate outlet are connected to a flue gas branch pipe 35. The present invention has a unique design for the tail gas treatment system, and the tail gas can be directly discharged after being treated by the electrostatic oil mist purifier and the photo-oxygen activated carbon deodorizer.

[0043] As an embodiment of a radioactive waste oil purification treatment device of the present invention, the accumulated liquid outlet 34 is provided with a second valve 38 .

[0044] As an embodiment of a radioactive waste oil purification treatment device of the present invention, the filtering unit adopts a primary filter 11, a secondary filter 12 and a tertiary filter 13 which are arranged in series in sequence. The primary filter 11, the secondary filter 12 and the tertiary filter 13 are all provided with an exhaust port 39. The exhaust port 39 is used for exhaust during circulation filtration, and is used for compressed air to blow the intake air during non-circulation filtration.

[0045] As an embodiment of a radioactive waste oil purification treatment device of the present invention, the filtering accuracies of the primary filter 11, the secondary filter 12 and the tertiary filter 13 are 20 μm, 10 μm and 3 μm respectively.

[0046] As an embodiment of a radioactive waste oil purification treatment device of the present invention, the circulating filter tank 6 includes a second tank body 40, a second stirring device 41 arranged in the second tank body 40, a second heating device 42 arranged on the side wall of the second tank body 40, and a respirator 43 arranged on the top of the second tank body.

[0047] As an embodiment of a radioactive waste oil purification treatment device of the present invention, the bottom of the static sedimentation tank 4 is a conical sedimentation area 44, and a sedimentation discharge pipe 45 is provided at the bottom of the conical sedimentation area 44. The sedimentation discharge pipe 45 is provided with a viewing window 46 and a drain valve 47;

[0048] As an embodiment of a radioactive waste oil purification treatment device of the present invention, one end of the injection pipe 5 passes through the top of the static sedimentation tank and extends to the interior of the static sedimentation tank, and the other end is connected to the feed port of the circulation filter tank 6.

[0049] As an embodiment of a radioactive waste oil purification treatment device of the present invention, the bottom of the injection pipe 5 is at a certain distance from the conical sedimentation area 44 to avoid the copper powder being extracted.

[0050] As an embodiment of a radioactive waste oil purification treatment device of the present invention, the circulation filtration pipeline is provided with sampling ports 15 both upstream and downstream of the filtration unit and on the injection pipeline 5 .

[0051] As an embodiment of a radioactive waste oil purification treatment device of the present invention, a third valve 48 is provided on the sampling port 15 .

[0052] As an embodiment of a radioactive waste oil purification treatment device of the present invention, a fourth valve 49 is provided on the gas injection pipeline 25;

[0053] As an embodiment of a radioactive waste oil purification treatment device of the present invention, a fifth valve 37 is provided on the injection pipeline 5 .

[0054] Example 2

[0055] A method for purifying radioactive waste oil, using the radioactive waste oil purification device described in Example 1, wherein the method comprises the following steps:

[0056] The radioactive waste oil is injected into the first tank 18 of the oxidation aging unit 1, and the catalyst copper powder is added to the first tank 18, and the feed liquid is heated to 150°C to 160°C, and compressed air is introduced at the same time. Under the catalytic action of the catalyst, heating and the action of oxygen, the oxidative aging is carried out to produce oil sludge, and the oil sludge is formed; after oxidative aging for 12 hours, the radioactive nuclides carried by the oil sludge are separated from the waste oil. After the waste oil is cooled to room temperature, the feed liquid containing copper powder and oil sludge is injected into the static sedimentation tank 4 for static sedimentation under the action of the oil pump 16. The bottom of the static sedimentation tank 4 is a conical structure, and the copper powder and oil sludge settle to the bottom of the static sedimentation tank 4, while the waste oil on the upper part enters the circulating filtration unit 2 for Circulation filtration, the circulation filtration time is 2h. In the circulation filtration unit 2, the feed liquid is filtered in turn through the primary filter 11, the secondary filter 12 and the tertiary filter 13 with precisions of 20μm, 10μm and 3μm respectively, to achieve efficient interception of solid impurities and sludge in the waste oil. The waste oil passes through the filter, and the sludge and other impurities are intercepted by the filter and deposited in the filter. The waste oil is continuously filtered in the static sedimentation tank 4 and the circulation filtration unit 2. The final waste oil does not contain sludge carrying radioactive nuclides, and the waste oil can meet the clean release requirements. During the filtration process, when the pressure difference before and after the filter is higher than 0.5MPa, it is considered that the filter is seriously clogged and the filter should be replaced.

[0057] At the same time, during the oxidation aging process, the fourth valve 49 is opened, and the flue gas of the oxidation aging unit 1 enters the flue gas purification pipeline 29 under the action of the air cooler 30, and is first cooled by the air cooler 30, and the condensed liquid enters the condensation liquid tank 33, and the uncondensed exhaust gas enters the electrostatic oil mist purifier 31 to remove the oil mist in the flue gas, and then the flue gas after the oil mist is removed is deodorized by the photo-oxidation activated carbon deodorizer 32 and discharged; and the oil mist discharged from the electrostatic oil mist purifier 31 enters the condensation liquid tank 33 with the condensate, and is finally discharged.

[0058] The present invention adopts a combined treatment method of oxidation aging + circulation filtration, selects copper powder as a catalyst, can achieve efficient treatment of radioactive waste oil, and has a unique design for the tail gas treatment system, so that the tail gas can be directly discharged. At present, the device has been applied in Daya Bay Nuclear Power and Qinshan Nuclear Power Project, and has extremely high maturity and reliability.

[0059] The above-described embodiments are only preferred embodiments of the present invention, and are not exhaustive of the feasible implementations of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A radioactive waste oil purification device, characterized in that: The invention comprises an oxidation aging unit (1), a static sedimentation tank (4) connected to the oxidation aging unit (1) via a feed liquid pipeline (3), and a circulation filtering unit (2) connected to the static sedimentation tank (4), wherein the circulation filtering unit (2) comprises a circulation filtering tank (6) connected to the static sedimentation tank (4) via an injection pipeline (5), an oil receiver (8) connected to the circulation filtering tank (6) via an emptying pipeline (7), and a circulation filtering pipeline (9) connected to the injection pipeline (5) and the emptying pipeline (7), and an oil pump (10), a one-way valve (14), and a filtering unit are sequentially arranged on the circulation filtering pipeline (9) according to the flow direction of the feed liquid.

2. A radioactive waste oil purification device according to claim 1, characterized in that: The liquid feed pipeline (3) is provided with an oil pump (16).

3. A radioactive waste oil purification device according to claim 2, characterized in that: The top of the oxidation aging unit is also connected to the feed liquid pipeline (3) via a first connecting pipe (17).

4. The radioactive waste oil purification device according to claim 1, characterized in that: The oxidation aging unit (1) comprises a first tank body (18), a first stirring device (19) and a temperature sensor (20) arranged in the first tank body (18), a first heating device (21) arranged on the first tank body (18), and an air injection port, a smoke outlet, a liquid feed inlet (22), and a discharge main pipe (23); the discharge main pipe (23) is also provided with a discharge port (24); the air injection port is connected to an air compression system (26) via an air injection pipeline (25); the discharge main pipe (23) is connected to the static sedimentation tank (4) via the liquid feed pipeline (3); The discharge port (24) and the discharge main pipe (23) are both provided with a first valve (27) on both sides of the discharge port (24).

5. The radioactive waste oil purification device according to claim 1, characterized in that: An exhaust gas purification system (28) is also included.

6. The radioactive waste oil purification device according to claim 5, characterized in that: The exhaust gas purification system (28) comprises a flue gas purification pipeline (29) arranged at the flue gas outlet of the oxidation aging unit (1); an air cooler (30), a flue gas purification unit, a condensed liquid tank (33) and a liquid outlet (34) arranged on the flue gas purification pipeline (29) in sequence according to the flow direction of the oil mist; the flue gas purification unit is arranged between the air cooler (30) and the condensed liquid tank (33) via a flue gas branch pipe (35).

7. The radioactive waste oil purification device according to claim 6, characterized in that: The flue gas purification unit comprises an electrostatic oil mist purifier (31) and a photo-oxygen activated carbon deodorizer (32) which are connected in sequence, a flue gas inlet and a condensate outlet arranged on the electrostatic oil mist purifier (31), and a purified gas outlet (36) arranged on the photo-oxygen activated carbon deodorizer (32); the flue gas inlet and the condensate outlet are connected to a flue gas branch pipe (35).

8. The radioactive waste oil purification device according to claim 7, characterized in that: The accumulated liquid outlet (34) is provided with a second valve (38).

9. The radioactive waste oil purification device according to claim 1, characterized in that: The filtering unit adopts a primary filter (11), a secondary filter (12) and a tertiary filter (13) which are arranged in series in sequence, and an exhaust port (39) is arranged on each of the primary filter (11), the secondary filter (12) and the tertiary filter (13).

10. The radioactive waste oil purification device according to claim 1, characterized in that: The circulating filter tank (6) comprises a second tank body (40), a second stirring device (41) arranged in the second tank body (40), a second heating device (42) arranged on the side wall of the second tank body (40), and a respirator (43) arranged on the top of the second tank body.

11. The radioactive waste oil purification device according to claim 1, characterized in that: The bottom of the static sedimentation tank (4) is a conical sedimentation area (44), a sedimentation discharge pipe (45) is provided at the bottom of the conical sedimentation area (44), and a viewing window (46) and a sewage valve (47) are provided on the sedimentation discharge pipe (45).

12. The radioactive waste oil purification device according to claim 1, characterized in that: One end of the injection pipe (5) passes through the top of the static sedimentation tank and extends to the interior of the static sedimentation tank, and the other end is connected to the feed port of the circulation filter tank (6).

13. The radioactive waste oil purification device according to claim 1, characterized in that: The circulating filtration pipeline is provided with sampling ports (15) both upstream and downstream of the filtration unit and on the injection pipeline (5).

14. A method for purifying radioactive waste oil, characterized in that: The method comprises the following steps: injecting radioactive waste oil into a first tank (18) of an oxidation aging unit (1), adding catalyst copper powder into the first tank (18), heating the feed liquid to 150° C. to 160° C., introducing compressed air at the same time, and performing oxidation aging under the action of the catalyst copper powder, heating and oxygen to generate oil sludge; After the oxidation aging is completed, the liquid containing copper powder and oil sludge is injected into the static sedimentation tank (4) under the action of the oil pump (16). In the static sedimentation tank (4), the copper powder and oil sludge are precipitated to the bottom of the static sedimentation tank (4), and the waste oil in the upper part of the static sedimentation tank (4) enters the circulation filtration unit (2), and after being circulated and filtered several times by the circulation filtration unit (2), it is finally discharged into the oil receiver (8).

15. A method for purifying radioactive waste oil according to claim 14, characterized in that: During the oxidation aging process, the exhaust gas purification system (28) is turned on, and the flue gas from the oxidation aging unit (1) enters the flue gas purification pipeline (29) under the action of the air cooler (30), and is first cooled by the air cooler (30), and the condensed liquid enters the condensation liquid storage tank (33), and the uncondensed exhaust gas enters the electrostatic oil mist purifier (31) to remove the oil mist in the flue gas, and then the flue gas after the oil mist is removed is deodorized by the photo-oxidation activated carbon deodorizer (32) and discharged; The oil mist discharged from the electrostatic oil mist purifier (31) enters the condensate accumulation tank (33) along with the condensate and is finally discharged.

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