PTA oxidation tail gas treatment device

Abstract

The utility model discloses a PTA (pure terephthalic acid) oxidation tail gas treatment device, which relates to the technical field of waste gas treatment and comprises a reaction box, a first gas inlet is arranged at the bottom of one side of the reaction box, the first gas inlet is connected with a gas inlet pipe, a purification device is mounted at the bottom end in the reaction box, and a first partition plate is mounted at the top of the purification device. A decomposition device is mounted at the top of the first partition plate, a second partition plate is mounted at the top of the decomposition device, an adsorption bin is arranged at the top of the second partition plate, and an exhaust chimney is mounted at the top of the adsorption bin. The waste gas is primarily purified through the purification device, so that the temperature and activity of the waste gas are reduced, a large number of materials are not consumed, the price cost is low, the waste gas is subjected to photochemical reaction through the decomposition device, harmful parts in the waste gas are reduced, the operation process is short, and activated carbon is more convenient and faster to replace by installing the adsorption bin; the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a PTA oxidation tail gas treatment device. Background Art

[0002] Since the 1980s, the market demand for PTA (terephthalic acid) has increased dramatically, resulting in a rapid increase in PTA production capacity, which has also driven the development of PTA wastewater treatment technology. At present, PTA is usually obtained by catalytic oxidation of paraxylene (PX) at high temperature and high pressure, and then refined. In the tail gas treatment process, a variety of PTA oxidation tail gas purification technologies have been reported, such as adsorption method, condensation method, direct combustion method, etc. These methods will produce secondary pollution, high energy consumption, and the purification effect is easily limited by the concentration and temperature of organic waste gas. After the tail gas is washed by the washing tower, some washing wastewater will be produced, which contains a certain concentration of bromide ions and has a high economic value. If it is discharged directly, it will not only cause a waste of resources, but also cause environmental pollution. The following problems exist in the existing technology:

[0003] 1. The existing PTA oxidation tail gas treatment device consumes a large amount of acetic acid when using oxidation reaction to preliminarily treat the waste gas, which is expensive.

[0004] 2. The existing PTA oxidation tail gas treatment device requires a titanium stirring device for continuous stirring during the subsequent treatment and purification of the tail gas by oxidation reaction. The stirring is time-consuming and activated carbon is needed to adsorb toxic substances. The traditional device is inconvenient to replace the activated carbon when it needs to be replaced. Utility Model Content

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A PTA oxidation tail gas treatment device comprises a reaction box, a first air inlet is provided at the bottom of one side of the reaction box, the first air inlet is connected to an air inlet pipe, a purification device is installed at the bottom end inside the reaction box, a first baffle is installed on the top of the purification device, a decomposition device is installed on the top of the first baffle, a second baffle is installed on the top of the decomposition device, an adsorption bin is provided on the top of the second baffle, an exhaust chimney is installed on the top of the adsorption bin, and a plurality of supporting legs are installed at the bottom of the reaction box.

[0007] A further improvement of the technical solution of the utility model is that the purification device includes a condenser, a condenser tube is installed in the condenser, a dispersion plate is installed on one side of the condenser, ventilation holes are opened on the dispersion plate, the ventilation holes are opened through the dispersion plate, and the diameter of the circular hole on one side is larger than the diameter of the circular hole on the other side, and a superoxide generating box is installed on the other side of the dispersion plate.

[0008] A further improvement of the technical solution of the utility model is that a superoxide generator is installed in the superoxide generating box, the condenser, the dispersion plate, and one end of the superoxide generating box are all fixedly installed on the bottom of the first partition, and the first partition is provided with a first circular hole.

[0009] A further improvement of the technical solution of the utility model is that the decomposition device includes a photolytic oxidation box, the top of which is fixedly mounted on a second partition, a second circular hole is provided on the second partition, a second air inlet is provided at the bottom of one side of the photolytic oxidation box, a first connecting pipe is connected to the second air inlet, one end of the first connecting pipe is connected to the first circular hole, and a UV lamp is installed in the photolytic oxidation box.

[0010] A further improvement of the technical solution of the utility model is that an exhaust port is opened at the top of the other side of the photolysis oxidation box, and a second connecting pipe is connected to the exhaust port, and one end of the second connecting pipe is connected to the second circular hole.

[0011] A further improvement of the technical solution of the utility model is that an inclined plate is installed in the adsorption bin, one end of the inclined plate is installed at the edge of the second circular hole, a filter screen is installed on the second circular hole, and the other end of the inclined plate is attached to one side of the inside of the adsorption bin, and activated carbon is loaded in the adsorption bin.

[0012] A further improvement of the technical solution of the utility model is that a discharge hole is provided on one side of the adsorption bin, a valve is installed on the discharge hole, a loading hole is provided on the top of the adsorption bin, a sealing cover is installed on the loading hole, and sealing rings are installed on both the valve and the sealing cover.

[0013] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0014] 1. The utility model provides a PTA oxidation tail gas treatment device. When toxic waste gas needs to be purified, the waste gas enters the first air inlet from the air inlet pipe, and then enters the inside of the reaction box. At this time, the waste gas encounters the condenser. After the condenser starts to work, the gas entering the inside of the condenser is greatly reduced in temperature by the condenser tube, and the activity of the waste gas after cooling is reduced. Then the gas meets the dispersion plate forward, and the dispersion plate is provided with ventilation holes. The waste gas enters the ventilation holes from one side of the dispersion plate, and then enters the other side of the dispersion plate. Then the waste gas flows forward through the superoxide generation box, and the superoxide generator is installed in the superoxide generation box. The waste gas is mixed with superoxide through the superoxide generator, and the long-chain organic volatile components in the waste gas are removed by the strong oxidizing property of superoxide, so that it is not necessary to use oxidation reaction for treatment in the early stage of the waste gas, and the price cost is low.

[0015] 2. The utility model provides a PTA oxidation tail gas treatment device. The waste gas purified by the purification device enters into the first connecting pipe through the first circular hole, and then enters into the interior of the photolysis oxidation box through the second air inlet. A plurality of UV lamps are installed in the photolysis oxidation box. The UV lamps can be used to irradiate ultraviolet light so that ultraviolet light and organic matter in the waste gas undergo photochemical reaction, thereby further reducing harmful components in the waste gas. After irradiation, the waste gas is discharged through the exhaust port and discharged into the second connecting pipe, so that the waste gas does not need to be stirred like an oxidation reaction during subsequent purification, which consumes too much time. The device takes less time and has a shorter process.

[0016] 3. The utility model provides a PTA oxidation tail gas treatment device. Under the joint action of, after the photolysis oxidation box further treats the waste gas, the waste gas flows into the second connecting pipe, and enters the adsorption bin through the second circular hole. A large amount of activated carbon is loaded in the adsorption bin. The activated carbon can wrap and treat trace amounts of organic waste through biological extracts, and finally meet the requirements of deep waste gas treatment. The treated waste gas is discharged through the exhaust chimney. When the activated carbon cannot have a good adsorption effect after being used for a long time, the valve is opened to discharge the activated carbon from the discharge hole. The installed inclined plate makes the activated carbon be discharged from the discharge hole at an angle. The installed filter screen prevents the activated carbon from falling into the second circular hole. Then the activated carbon in the adsorption bin is replenished, the sealing cover is opened, and it is loaded from the loading hole, so that the replacement of activated carbon is more convenient and quick, and the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the PTA oxidation tail gas treatment device of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the purification device of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the decomposition device of the utility model;

[0020] Figure 4 It is a structural schematic diagram of the adsorption bin of the utility model.

[0021] In the figure: 1. reaction box; 2. air inlet pipe; 3. first air inlet; 4. purification device; 5. decomposition device; 6. adsorption chamber; 7. exhaust chimney; 8. first partition; 9. second partition; 10. support leg; 11. first circular hole; 12. second circular hole; 41. condenser; 42. condenser tube; 43. dispersion plate; 44. ventilation hole; 45. superoxide generation box; 51. photolysis oxidation box; 52. second air inlet; 53. first connecting pipe; 54. exhaust port; 55. second connecting pipe; 56. UV lamp; 61. activated carbon; 62. inclined plate; 63. loading hole; 64. discharge hole; 65. sealing cover; 66. valve; 67. filter. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the embodiments:

[0023] Example 1

[0024] like Figure 1-4 As shown, the utility model provides a PTA oxidation tail gas treatment device, including a reaction box 1, a first air inlet 3 is opened at the bottom of one side of the reaction box 1, the first air inlet 3 is connected to the air inlet pipe 2, a purification device 4 is installed at the bottom end of the reaction box 1, a first partition 8 is installed on the top of the purification device 4, a decomposition device 5 is installed on the top of the first partition 8, a second partition 9 is installed on the top of the decomposition device 5, an adsorption bin 6 is provided on the top of the second partition 9, an exhaust chimney 7 is installed on the top of the adsorption bin 6, and a plurality of support legs 10 are installed at the bottom of the reaction box 1.

[0025] Example 2

[0026] like Figure 1-4 As shown, on the basis of Example 1, the utility model provides a technical solution: preferably, the purification device 4 includes a condenser 41, a condenser tube 42 is installed in the condenser 41, a dispersion plate 43 is installed on one side of the condenser 41, a ventilation hole 44 is opened on the dispersion plate 43, the ventilation hole 44 is opened through the dispersion plate 43, and the diameter of the circular hole on one side is larger than the diameter of the circular hole on the other side, a superoxide generating box 45 is installed on the other side of the dispersion plate 43, a superoxide generating box 45 is installed in the superoxide generating box 45, and one end of the condenser 41, the dispersion plate 43, and the superoxide generating box 45 are fixedly installed at the bottom of the first partition plate 8, and the first partition plate 8 is provided with a first circular hole 11.

[0027] In this embodiment, when toxic waste gas needs to be purified, the waste gas enters the first air inlet 3 from the air inlet pipe 2, and then enters the interior of the reaction box 1. At this time, the waste gas encounters the condenser 41. After the condenser 41 starts working, the gas entering the interior of the condenser 41 is greatly reduced in temperature by the condenser tube 42, and the activity of the waste gas after cooling is reduced. Then the gas meets the dispersion plate 43 forward, and the dispersion plate 43 is provided with a ventilation hole 44. The waste gas enters the ventilation hole 44 from one side of the dispersion plate 43, and then enters the other side of the dispersion plate 43. Then the waste gas flows forward through the superoxide generating box 45, and a superoxide generator is installed in the superoxide generating box 45. The waste gas is mixed with superoxide through the superoxide generator, and the long-chain organic volatile components in the waste gas are removed by the strong oxidizing property of superoxide, so that the oxidation reaction does not need to be used for the preliminary treatment of the waste gas, and the price cost is low.

[0028] Example 3

[0029] like Figure 1-4 As shown, on the basis of Example 1, the utility model provides a technical solution: preferably, the decomposition device 5 includes a photolytic oxidation box 51, the top of the photolytic oxidation box 51 is fixedly mounted on the second partition plate 9, the second partition plate 9 is provided with a second circular hole 12, a second air inlet 52 is provided at the bottom of one side of the photolytic oxidation box 51, a first connecting pipe 53 is connected to the second air inlet 52, one end of the first connecting pipe 53 is connected to the first circular hole 11, a UV lamp 56 is installed in the photolytic oxidation box 51, an exhaust port 54 is provided at the top of the other side of the photolytic oxidation box 51, a second connecting pipe 55 is connected to the exhaust port 54, and one end of the second connecting pipe 55 is connected to the second circular hole 12.

[0030] In this embodiment, the exhaust gas purified by the purification device 4 enters the first connecting pipe 53 through the first circular hole 11, and then enters the interior of the photolysis oxidation box 51 through the second air inlet 52. A plurality of UV lamps 56 are installed in the photolysis oxidation box 51. The UV lamps 56 can be used to irradiate ultraviolet light so that ultraviolet light and organic matter in the exhaust gas undergo a photochemical reaction, thereby further reducing harmful components in the exhaust gas. After irradiation, the exhaust gas is discharged through the exhaust port 54 and discharged into the second connecting pipe 55, so that the exhaust gas does not need to be stirred like an oxidation reaction during subsequent purification, which consumes too much time. The device takes less time and has a shorter process.

[0031] Example 4

[0032] like Figure 1-4As shown, on the basis of Example 1, the utility model provides a technical solution: preferably, an inclined plate 62 is installed in the adsorption bin 6, one end of the inclined plate 62 is installed at the edge of the second circular hole 12, a filter screen 67 is installed on the second circular hole 12, the other end of the inclined plate 62 is attached to one side of the inside of the adsorption bin 6, the adsorption bin 6 is filled with activated carbon 61, a discharge hole 64 is provided on one side of the adsorption bin 6, a valve 66 is installed on the discharge hole 64, a loading hole 63 is provided on the top of the adsorption bin 6, a sealing cover 65 is installed on the loading hole 63, and sealing rings are installed on both the valve 66 and the sealing cover 65.

[0033] In this embodiment, after the photolysis oxidation box 51 further processes the exhaust gas, the exhaust gas flows into the second connecting pipe 55, passes through the second circular hole 12 and enters the adsorption chamber 6. A large amount of activated carbon 61 is loaded in the adsorption chamber 6. The activated carbon 61 can wrap and process trace amounts of organic waste through biological extracts, and finally achieve the requirements of deep waste gas treatment. The treated exhaust gas is discharged through the exhaust chimney 7. When the activated carbon 61 cannot have a good adsorption effect after being used for a long time, the valve 66 is opened to discharge the activated carbon 61 from the discharge hole 64. The installed inclined plate 62 allows the activated carbon 61 to be discharged from the discharge hole 64 at an angle. The installed filter screen 67 prevents the activated carbon 61 from falling into the second circular hole 12. Then, the activated carbon 61 in the adsorption chamber 6 is replenished, the sealing cover 65 is opened, and it is loaded from the loading hole 63, so that the replacement of the activated carbon 61 is more convenient and quick, thereby improving work efficiency.

[0034] The working principle of the PTA oxidation tail gas treatment device is described in detail below.

[0035] like Figure 1-4As shown, when the toxic waste gas needs to be purified, the waste gas enters the first air inlet 3 from the air inlet pipe 2, and then enters the interior of the reaction box 1. At this time, the waste gas encounters the condenser 41. After the condenser 41 starts to work, the gas entering the interior of the condenser 41 is greatly reduced in temperature by the condenser tube 42, and the activity of the waste gas after cooling is reduced. Then the gas moves forward to meet the dispersion plate 43, and the dispersion plate 43 is provided with a ventilation hole 44. The waste gas enters the ventilation hole 44 from one side of the dispersion plate 43, and then enters the other side of the dispersion plate 43. Then the waste gas flows forward through the superoxide generating box 45, and the superoxide generating box A superoxide generator is installed in 45, and the exhaust gas is mixed with superoxide through the superoxide generator. The long-chain organic volatile components in the exhaust gas are removed by the strong oxidizing property of superoxide, so that it is not necessary to use oxidation reaction to treat the exhaust gas in the early stage, and the price cost is low. The exhaust gas purified by the purification device 4 enters the first connecting pipe 53 through the first circular hole 11, and then enters the interior of the photolysis oxidation box 51 through the second air inlet 52. A plurality of UV lamps 56 are installed in the photolysis oxidation box 51. The UV lamps 56 can be used to irradiate ultraviolet light to make the ultraviolet light and the organic volatile components in the exhaust gas. The organic matter undergoes a photochemical reaction, which can further reduce the harmful components in the exhaust gas. Then, the exhaust gas is discharged through the exhaust port 54 after irradiation and discharged into the second connecting pipe 55, so that the exhaust gas does not need to be stirred like the oxidation reaction during subsequent purification, which consumes too much time. The device is time-consuming and has a short process. After the photolysis oxidation box 51 further processes the exhaust gas, the exhaust gas flows into the second connecting pipe 55 and enters the adsorption chamber 6 through the second circular hole 12. A large amount of activated carbon 61 is loaded in the adsorption chamber 6. The activated carbon 61 can be used to treat trace amounts of organic waste through the biological extract. The package treatment is carried out to finally meet the requirements of deep waste gas treatment. The treated waste gas is discharged through the exhaust chimney 7. When the activated carbon 61 cannot have a good adsorption effect after being used for a long time, the valve 66 is opened to discharge the activated carbon 61 from the discharge hole 64. The installed inclined plate 62 makes the activated carbon 61 be discharged from the discharge hole 64 at an angle. The installed filter screen 67 prevents the activated carbon 61 from falling into the second circular hole 12. Then the activated carbon 61 in the adsorption bin 6 is replenished, the sealing cover 65 is opened, and it is loaded from the loading hole 63, so that the replacement of the activated carbon 61 is more convenient and quick, thereby improving work efficiency.

[0036] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A PTA oxidation tail gas treatment device, comprising a reaction box (1), characterized in that: A first air inlet (3) is provided at the bottom of one side of the reaction box (1), and the first air inlet (3) is connected to an air inlet pipe (2). A purification device (4) is installed at the bottom of the reaction box (1), and a first partition (8) is installed on the top of the purification device (4). A decomposition device (5) is installed on the top of the first partition (8), and a second partition (9) is installed on the top of the decomposition device (5). An adsorption chamber (6) is provided on the top of the second partition (9), and an exhaust chimney (7) is installed on the top of the adsorption chamber (6). A plurality of supporting legs (10) are installed at the bottom of the reaction box (1).

2. A PTA oxidation tail gas treatment device according to claim 1, characterized in that: The purification device (4) comprises a condenser (41), a condenser tube (42) is installed in the condenser (41), a dispersion plate (43) is installed on one side of the condenser (41), a ventilation hole (44) is opened on the dispersion plate (43), the ventilation hole (44) is opened through the dispersion plate (43), and the diameter of the circular hole on one side is larger than the diameter of the circular hole on the other side, and a superoxide generating box (45) is installed on the other side of the dispersion plate (43).

3. A PTA oxidation tail gas treatment device according to claim 2, characterized in that: A superoxide generator is installed in the superoxide generating box (45), and the condenser (41), the dispersion plate (43), and one end of the superoxide generating box (45) are all fixedly mounted on the bottom of a first partition (8), and a first circular hole (11) is opened on the first partition (8).

4. A PTA oxidation tail gas treatment device according to claim 1, characterized in that: The decomposition device (5) comprises a photolysis oxidation box (51), the top of which is fixedly mounted on a second partition (9), the second partition (9) being provided with a second circular hole (12), a second air inlet (52) being provided at the bottom of one side of the photolysis oxidation box (51), the second air inlet (52) being connected to a first connecting pipe (53), one end of the first connecting pipe (53) being connected to the first circular hole (11), and a UV lamp (56) being installed in the photolysis oxidation box (51).

5. A PTA oxidation tail gas treatment device according to claim 4, characterized in that: An exhaust port (54) is provided at the top end of the other side of the photolysis oxidation box (51), and a second connecting pipe (55) is connected to the exhaust port (54), and one end of the second connecting pipe (55) is connected to the second circular hole (12).

6. A PTA oxidation tail gas treatment device according to claim 1, characterized in that: An inclined plate (62) is installed in the adsorption bin (6), one end of the inclined plate (62) is installed at the edge of the second circular hole (12), a filter screen (67) is installed on the second circular hole (12), and the other end of the inclined plate (62) is attached to one side of the interior of the adsorption bin (6), and the adsorption bin (6) is filled with activated carbon (61).

7. A PTA oxidation tail gas treatment device according to claim 1, characterized in that: A discharge hole (64) is provided on one side of the adsorption bin (6), a valve (66) is installed on the discharge hole (64), a loading hole (63) is provided on the top of the adsorption bin (6), a sealing cover (65) is installed on the loading hole (63), and sealing rings are installed on both the valve (66) and the sealing cover (65).

Images