Treatment of tail gas in hydrogen peroxide production and power generation device

Abstract

The utility model discloses a kind of processing and power generation device of hydrogen peroxide production oxidation tail gas, including tail gas access pipeline, first condenser, second condenser, first gas-liquid separator, second gas-liquid separator, third gas-liquid separator, storage tank, expansion generator set and tail gas unit, the cold side import of first condenser is used to access cooling medium, the cold side export of first condenser is used to discharge cooling medium, the hot side import of first condenser is connected with the tail gas access pipeline, the hot side export of first condenser is connected with the inlet of first gas-liquid separator, the liquid discharge port of first gas-liquid separator is connected with the storage tank, the exhaust port of first gas-liquid separator is connected with the hot side import of second condenser.The utility model can improve the condensation liquefaction rate of aromatic hydrocarbon in tail gas, can improve the recovery rate of aromatic hydrocarbon in tail gas, can avoid aromatic hydrocarbon waste in tail gas.

Description

Technical Field

[0001] This utility model relates to a device for treating oxidation tail gas and generating electricity in hydrogen peroxide production. Background Technology

[0002] Currently, the oxidation tail gas generated during the anthraquinone process for hydrogen peroxide production typically requires condensation and separation to recover aromatics before being fed into an expander generator for power generation. Chinese patent CN222526370U discloses an energy recovery device for oxidation tail gas from hydrogen peroxide production, which can recover aromatics from the tail gas and utilize it for power generation. However, in this device, the tail gas only undergoes one cooling and condensation process in a cold box before entering the expander generator. This results in an insufficient condensation and liquefaction rate of aromatics in the tail gas, leading to a low recovery rate and wasted aromatics. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a device for treating and generating electricity from the oxidation tail gas in hydrogen peroxide production. It can improve the condensation and liquefaction rate of aromatics in the tail gas, improve the recovery rate of aromatics in the tail gas, and avoid the waste of aromatics in the tail gas.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a device for treating and generating electricity from oxidation tail gas in hydrogen peroxide production, including a tail gas inlet pipeline, a first condenser, a second condenser, a first gas-liquid separator, a second gas-liquid separator, a third gas-liquid separator, a storage tank, an expansion generator set, and a tail gas generator set.

[0005] The first condenser has a cold-side inlet for receiving cooling medium and a cold-side outlet for discharging cooling medium. The first condenser has a hot-side inlet connected to the exhaust gas inlet pipe and a hot-side outlet connected to the inlet of the first gas-liquid separator. The first gas-liquid separator's drain outlet is connected to the storage tank. The first gas-liquid separator's exhaust outlet is connected to the hot-side inlet of the second condenser and a hot-side outlet connected to the inlet of the second gas-liquid separator. The second gas-liquid separator's exhaust outlet is connected to the storage tank. The second gas-liquid separator's exhaust outlet is connected to the inlet of the expansion generator set via a first branch, which contains a first valve. The second gas-liquid separator's exhaust outlet is also connected to the inlet of the exhaust gas generator set via a second branch, which contains a second valve. The expansion generator set's outlet is connected to the inlet of the third gas-liquid separator and a drain outlet connected to the storage tank. The third gas-liquid separator's exhaust outlet is connected to the cold-side inlet of the second condenser, and the second condenser's cold-side outlet is connected to the inlet of the exhaust gas generator set.

[0006] Furthermore, both the first valve and the second valve are solenoid valves.

[0007] Furthermore, the device for treating oxidation tail gas and generating electricity in hydrogen peroxide production also includes a controller and a speed sensor;

[0008] The speed sensor is connected to the turbine generator in the expansion generator set and is used to detect the speed information of the turbine generator. The speed sensor is also connected to the controller and is used to send the measured speed information of the turbine generator to the controller.

[0009] The controller is connected to the first valve and the second valve respectively and is used to control the opening and closing of the first valve and the second valve respectively according to the measured speed information of the turbine generator.

[0010] Further, a specific structure of the exhaust gas generator set is provided, wherein the exhaust gas generator set includes a fourth gas-liquid separator and a carbon fiber adsorption box;

[0011] The exhaust port of the second gas-liquid separator is connected to the inlet of the fourth gas-liquid separator through the second branch. The cold side outlet of the second condenser is also connected to the inlet of the fourth gas-liquid separator. The exhaust port of the fourth gas-liquid separator is connected to the air inlet of the carbon fiber adsorption box. The carbon fiber adsorption box has an exhaust port for discharging the gas after adsorption treatment.

[0012] Furthermore, the air inlet of the carbon fiber adsorption box is connected to a third valve, and the exhaust outlet of the carbon fiber adsorption box is connected to a fourth valve.

[0013] Furthermore, the exhaust gas generator unit also includes a steam inlet pipeline, a third condenser, and a stratification tank;

[0014] The steam inlet pipe is connected to the steam inlet of the carbon fiber adsorption box;

[0015] The desorption outlet of the carbon fiber adsorption box is connected to the feed inlet of the third condenser;

[0016] The outlet of the third condenser is connected to the stratification tank;

[0017] The steam inlet of the carbon fiber adsorption box is connected to a fifth valve;

[0018] The desorption outlet of the carbon fiber adsorption box is connected to a sixth valve.

[0019] Furthermore, the hydrogen peroxide production process oxidation tail gas treatment and power generation device also includes a waste liquid tank;

[0020] The upper end of the stratified tank has a material outlet for discharging the upper layer material;

[0021] The bottom of the stratified tank is provided with a waste liquid outlet connected to the inlet of the waste liquid tank;

[0022] The outlet of the waste liquid tank is used to connect to the sewage pool.

[0023] Furthermore, the exhaust gas generator set includes at least two of the aforementioned carbon fiber adsorption boxes;

[0024] The exhaust port of the fourth gas-liquid separator is connected to the air inlet of each of the carbon fiber adsorption boxes respectively;

[0025] The steam inlet pipeline is connected to the steam inlet of each of the carbon fiber adsorption boxes respectively;

[0026] The desorption outlet of each of the carbon fiber adsorption boxes is connected to the inlet of the third condenser;

[0027] Each of the carbon fiber adsorption boxes has an air inlet connected to a third valve;

[0028] Each of the carbon fiber adsorption boxes has a fourth valve connected to its exhaust port.

[0029] Each of the carbon fiber adsorption boxes is connected to a fifth valve at its steam inlet;

[0030] Each of the carbon fiber adsorption boxes is connected to a sixth valve at its desorption outlet.

[0031] Furthermore, the inlet of the third condenser is connected to the cooling water inlet pipe, and the outlet of the third condenser is connected to the cooling water outlet pipe.

[0032] With the above technical solution, when the expansion generator set is in normal working condition, the first valve is open and the second valve is closed. At this time, the tail gas generated in the oxidation process of anthraquinone hydrogen peroxide production will flow into the hot side inlet of the first condenser from the tail gas inlet pipe. At the same time, the cooling medium will flow into the cold side inlet of the first condenser and then be discharged from the cold side outlet of the first condenser. In the first condenser, the tail gas with a high temperature will exchange heat with the cooling medium, thereby cooling the tail gas to about 35°C so that some of the free water and aromatics in the tail gas will be condensed and liquefied. Then, the gas-liquid mixture formed by the condensation and liquefaction of the tail gas in the first condenser will be discharged from the hot side outlet of the first condenser and flow into the first gas-liquid separator for gas-liquid separation. The liquid water and aromatics separated in the first gas-liquid separator will be discharged from the drain port of the first gas-liquid separator into the storage tank for storage. The remaining tail gas separated in the first gas-liquid separator will be discharged from the exhaust port of the first gas-liquid separator and then flow into the hot side inlet of the second condenser. The remaining tail gas flowing into the hot side inlet of the second condenser will be cooled down to about 10°C, so that more free water and aromatics will be condensed and liquefied and precipitated. Then, the gas-liquid mixture formed by the condensation and liquefaction of the remaining tail gas in the second condenser will be discharged from the hot side outlet of the second condenser and flow into the second gas-liquid separator for gas-liquid separation. The liquid water and aromatics separated in the second gas-liquid separator will be discharged from the drain port of the second gas-liquid separator into the storage tank for storage. The gas separated in the second gas-liquid separator will be discharged from the exhaust port of the second gas-liquid separator and flow through the first branch before flowing into the air inlet of the expansion generator set. In the expander generator set, the gas flowing in from the inlet expands as the working fluid to generate electricity. After power generation, the working fluid's pressure decreases and its temperature drops to 0-5°C. Residual free water and aromatics in the gas condense into droplets. The gas containing these droplets exits from the outlet and flows into a third gas-liquid separator for gas-liquid separation. The liquid water and aromatics separated in the third gas-liquid separator are discharged from its outlet into a storage tank. The low-temperature gas separated in the third gas-liquid separator exits from its exhaust outlet and flows into the cold-side inlet of the second condenser, then exits from the cold-side outlet into the exhaust gas generator set. Therefore, in the second condenser, the residual exhaust gas flowing in from the hot-side inlet exchanges heat with the low-temperature gas flowing in from the cold-side inlet, cooling the residual exhaust gas to approximately 10°C. Then, the gas discharged into the exhaust gas generator unit from the cold side outlet of the second condenser will be treated by the exhaust gas generator unit to meet the standards before being discharged.In this embodiment, the exhaust gas undergoes cooling and condensation once in the first condenser and then again in the second condenser before entering the expander generator set. This significantly improves the condensation and liquefaction rate of aromatics in the exhaust gas, thereby greatly increasing the recovery rate of aromatics and achieving efficient recovery, thus avoiding waste. Furthermore, the second condenser recovers and utilizes the cooling energy from the exhaust gas discharged from the expander generator set, preventing waste and reducing the need for external refrigeration, thus saving refrigeration energy. Additionally, when the expander generator set is in a shutdown state, the first valve is closed and the second valve is opened. At this time, the gas separated in the second gas-liquid separator is discharged from the exhaust port of the second gas-liquid separator and flows directly through the second branch into the exhaust gas generator set, where it is treated to meet emission standards before being discharged. Attached Figure Description

[0033] Figure 1 This is a process flow diagram of the treatment of oxidation tail gas and power generation device in hydrogen peroxide production according to this utility model.

[0034] Figure 2 This is a process flow diagram of the exhaust gas generator unit of this utility model;

[0035] In the diagram: 1. Exhaust gas inlet pipe; 2. First condenser; 3. Second condenser; 4. First gas-liquid separator; 5. Second gas-liquid separator; 6. Third gas-liquid separator; 7. Expander generator set; 8. Exhaust gas generator set; 9. First branch; 10. First valve; 11. Second branch; 12. Second valve; 13. Fourth gas-liquid separator; 14. Carbon fiber adsorption box; 15. Third valve; 16. Fourth valve; 17. Steam inlet pipe; 18. Third condenser; 19. Separation tank; 20. Fifth valve; 21. Sixth valve; 22. Waste liquid tank. Detailed Implementation

[0036] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0037] like Figure 1 , 2 As shown, a device for treating and generating electricity from oxidation tail gas in hydrogen peroxide production includes a tail gas inlet pipeline 1, a first condenser 2, a second condenser 3, a first gas-liquid separator 4, a second gas-liquid separator 5, a third gas-liquid separator 6, a storage tank, an expansion generator set 7, and a tail gas generator set 8.

[0038] The cold-side inlet of the first condenser 2 is used to receive the cooling medium, and the cold-side outlet of the first condenser 2 is used to discharge the cooling medium. The hot-side inlet of the first condenser 2 is connected to the exhaust gas inlet pipe 1, and the hot-side outlet of the first condenser 2 is connected to the inlet of the first gas-liquid separator 4. The drain port of the first gas-liquid separator 4 is connected to the storage tank, and the exhaust port of the first gas-liquid separator 4 is connected to the hot-side inlet of the second condenser 3. The hot-side outlet of the second condenser 3 is connected to the inlet of the second gas-liquid separator 5, and the drain port of the second gas-liquid separator 5 is connected to the storage tank. The exhaust port of the second gas-liquid separator 5 is connected to the air inlet of the expansion generator set 7 via the first branch 9. The first branch 9 is connected to the first valve 10. The exhaust port of the second gas-liquid separator 5 is also connected to the inlet of the exhaust gas generator set 8 via the second branch 11. The second branch 11 is connected to the second valve 12. The air outlet of the expansion generator set 7 is connected to the inlet of the third gas-liquid separator 6. The liquid outlet of the third gas-liquid separator 6 is connected to the storage tank. The exhaust port of the third gas-liquid separator 6 is connected to the cold side inlet of the second condenser 3. The cold side outlet of the second condenser 3 is connected to the inlet of the exhaust gas generator set 8.

[0039] Specifically, when the expansion generator set 7 is in normal working condition, the first valve 10 is open and the second valve 12 is closed. At this time, the tail gas generated in the oxidation process of anthraquinone hydrogen peroxide production will flow from the tail gas inlet pipe 1 into the hot side inlet of the first condenser 2. At the same time, the cooling medium will flow in from the cold side inlet of the first condenser 2 and then be discharged from the cold side outlet of the first condenser 2. In the first condenser 2, the tail gas with a high temperature will exchange heat with the cooling medium, thereby cooling the tail gas to about 35°C so that some of the free water and aromatics in the tail gas will be condensed and liquefied. Then, the gas-liquid mixture formed by the condensation and liquefaction of the tail gas in the first condenser 2 will be discharged from the hot side outlet of the first condenser 2 and flow into the first gas-liquid separator 4 for gas-liquid separation. The liquid water and aromatics separated in the first gas-liquid separator 4 will be discharged from the drain port of the first gas-liquid separator 4 into a storage tank for storage. The remaining tail gas separated in the first gas-liquid separator 4 will be discharged from the exhaust port of the first gas-liquid separator 4 and then flow into the hot side inlet of the second condenser 3. The remaining tail gas flowing into the hot side inlet of the second condenser 3 will be cooled down to about 10°C, so that more free water and aromatics will be condensed and liquefied and precipitated. Then, the gas-liquid mixture formed by the condensation and liquefaction of the remaining tail gas in the second condenser 3 will be discharged from the hot side outlet of the second condenser 3 and flow into the second gas-liquid separator 5 for gas-liquid separation. The liquid water and aromatics separated in the second gas-liquid separator 5 will be discharged from the drain port of the second gas-liquid separator 5 into a storage tank for storage. The gas separated in the second gas-liquid separator 5 will be discharged from the exhaust port of the second gas-liquid separator 5 and flow through the first branch 9 before flowing into the air inlet of the expansion generator set 7. In the expander generator set 7, the gas flowing in from the inlet of the expander generator set 7 is used as the working fluid to expand and perform work, thereby generating electricity. After power generation, the working fluid gas will experience a pressure reduction and a temperature drop to 0-5℃. The remaining small amount of free water and aromatics in the gas will condense into droplets. The gas containing droplets will then be discharged from the outlet of the expander generator set 7 and flow into the third gas-liquid separator 6 for gas-liquid separation. The liquid water and aromatics separated in the third gas-liquid separator 6 will be discharged from the outlet of the third gas-liquid separator 6 into a storage tank for storage. The low-temperature gas separated in the third gas-liquid separator 6 will be discharged from the exhaust outlet of the third gas-liquid separator 6 and then flow into the cold-side inlet of the second condenser 3, and finally be discharged into the exhaust gas generator set 8 from the cold-side outlet of the second condenser 3. Therefore, in the second condenser 3, the remaining exhaust gas flowing in from the hot-side inlet of the second condenser 3 exchanges heat with the low-temperature gas flowing in from the cold-side inlet of the second condenser 3, thereby cooling the remaining exhaust gas flowing in from the hot-side inlet of the second condenser 3 to approximately 10℃. Then the gas discharged from the cold side outlet of the second condenser 3 into the exhaust gas generator unit 8 will be treated by the exhaust gas generator unit 8 to meet the standards before being discharged.In this embodiment, the exhaust gas undergoes cooling and condensation once in the first condenser 2 before entering the expander generator set 7, and then again in the second condenser 3. Finally, the exhaust gas undergoes a final cooling and condensation process within the expander generator set 7. This significantly improves the condensation and liquefaction rate of aromatics in the exhaust gas, thereby greatly increasing the recovery rate of aromatics and achieving efficient recovery of aromatics from the exhaust gas, thus avoiding waste. Furthermore, the second condenser 3 allows for the recovery and reuse of the cooling energy in the gas discharged from the expander generator set 7, preventing waste of cooling energy and reducing the need for external refrigeration, thereby saving refrigeration energy consumption.

[0040] More specifically, when the expansion generator set 7 is in a shutdown state, the first valve 10 is closed and the second valve 12 is opened. At this time, the gas separated in the second gas-liquid separator 5 will be discharged from the exhaust port of the second gas-liquid separator 5 and flow directly through the second branch 11 into the exhaust gas generator set 8. After being treated by the exhaust gas generator set 8 to meet the standards, it will be discharged.

[0041] Specifically, both the first valve 10 and the second valve 12 are solenoid valves, and the treatment and power generation device for oxidation tail gas in hydrogen peroxide production may also include a controller and a speed sensor.

[0042] The speed sensor is connected to the turbine generator in the expansion generator set 7 and is used to detect the speed information of the turbine generator. The speed sensor is also connected to the controller and is used to send the measured speed information of the turbine generator to the controller.

[0043] The controller is connected to the first valve 10 and the second valve 12 respectively and is used to control the opening and closing of the first valve 10 and the second valve 12 according to the measured speed information of the turbine generator. Specifically, when the speed of the turbine generator is zero, it means that the expansion generator set 7 is in a stopped state. At this time, the controller controls the first valve 10 to close and controls the second valve 12 to open, so that the gas separated in the second gas-liquid separator 5 is discharged from the exhaust port of the second gas-liquid separator 5 and flows directly through the second branch 11 into the exhaust gas generator set 8. When the speed of the turbine generator is in the normal operating range, it means that the expansion generator set 7 is in a working state. At this time, the controller controls the first valve 10 to open and controls the second valve 12 to close, so that the gas separated in the second gas-liquid separator 5 is discharged from the exhaust port of the second gas-liquid separator 5 and flows through the first branch 9 into the air inlet of the expansion generator set 7.

[0044] like Figure 1 , 2 As shown, the exhaust gas generator set 8 may include a fourth gas-liquid separator 13 and a carbon fiber adsorption box 14.

[0045] The exhaust port of the second gas-liquid separator 5 is connected to the inlet of the fourth gas-liquid separator 13 via the second branch 11. The cold-side outlet of the second condenser 3 is also connected to the inlet of the fourth gas-liquid separator 13. The exhaust port of the fourth gas-liquid separator 13 is connected to the air inlet of the carbon fiber adsorption box 14, which has an exhaust port for discharging the gas after adsorption treatment. Specifically, the exhaust gas discharged into the exhaust gas unit 8 first enters the fourth gas-liquid separator 13 for gas-liquid separation. The separated liquid is discharged from the liquid outlet of the fourth gas-liquid separator 13, and the separated gas flows out from the exhaust port of the fourth gas-liquid separator 13 and then flows into the carbon fiber adsorption box 14 from the air inlet. The activated carbon fibers in the carbon fiber adsorption box 14 can continuously adsorb trace amounts of aromatic hydrocarbons entrained in the gas. The gas after adsorption treatment is then discharged from the exhaust port of the carbon fiber adsorption box 14 in compliance with standards.

[0046] like Figure 1 , 2 As shown, the air inlet of the carbon fiber adsorption box 14 is connected to a third valve 15, and the exhaust port of the carbon fiber adsorption box 14 is connected to a fourth valve 16. The exhaust gas unit 8 also includes a steam inlet pipe 17, a third condenser 18, a stratification tank 19, and a waste liquid tank 22.

[0047] The steam inlet pipe 17 is connected to the steam inlet of the carbon fiber adsorption box 14;

[0048] The desorption outlet of the carbon fiber adsorption box 14 is connected to the feed inlet of the third condenser 18;

[0049] The discharge port of the third condenser 18 is connected to the layered tank 19;

[0050] The steam inlet of the carbon fiber adsorption box 14 is connected to a fifth valve 20;

[0051] The desorption outlet of the carbon fiber adsorption box 14 is connected to a sixth valve 21;

[0052] The upper end of the layered trough 19 has a material outlet for discharging the upper layer material;

[0053] The bottom of the layered tank 19 is provided with a waste liquid outlet connected to the inlet of the waste liquid tank 22;

[0054] The outlet of the waste liquid tank 22 is used to connect to the sewage pool.

[0055] Specifically, when the activated carbon fibers in the carbon fiber adsorption box 14 are saturated with aromatics, the third valve 15 and the fourth valve 16 can be closed, and the fifth valve 20 and the sixth valve 21 can be opened. At this time, water vapor in the steam inlet pipe 17 can flow into the carbon fiber adsorption box 14 from the steam inlet, thereby regenerating the aromatics adsorbed in the activated carbon fibers through steam. The precipitated mixed gas is then discharged from the precipitation outlet into the third condenser 18 for condensation and liquefaction. The condensate in the third condenser 18 then flows into the stratification tank 19. In the stratification tank 19, the aromatic liquid will float on the upper layer and can be discharged and collected from the material outlet of the stratification tank 19. The wastewater in the stratification tank 19 can be discharged from the waste liquid outlet of the stratification tank 19 into the waste liquid tank 22 and then into the sewage tank.

[0056] like Figure 1 , 2 As shown, the exhaust gas generator unit 8 may include at least two carbon fiber adsorption boxes 14; wherein, the exhaust port of the fourth gas-liquid separator 13 is connected to the air inlet of each carbon fiber adsorption box 14, the steam inlet pipe 17 is connected to the steam inlet of each carbon fiber adsorption box 14, the desorption outlet of each carbon fiber adsorption box 14 is connected to the feed inlet of the third condenser 18, the air inlet of each carbon fiber adsorption box 14 is connected to a third valve 15, the exhaust port of each carbon fiber adsorption box 14 is connected to a fourth valve 16, the steam inlet of each carbon fiber adsorption box 14 is connected to a fifth valve 20, and the desorption outlet of each carbon fiber adsorption box 14 is connected to a sixth valve 21. In this embodiment, multiple carbon fiber adsorption boxes 14 are provided, and the multiple carbon fiber adsorption boxes 14 can be switched and operated alternately. When water vapor is introduced into some carbon fiber adsorption boxes 14 to desorb and adsorb aromatics, other carbon fiber adsorption boxes 14 can normally adsorb aromatics in the exhaust gas. Specifically, the inlet of the third condenser 18 is connected to the cooling water inlet pipe, and the outlet of the third condenser 18 is connected to the cooling water outlet pipe.

[0057] In summary, when the expansion generator set 7 is in normal working condition, the first valve 10 is open and the second valve 12 is closed. At this time, the tail gas generated in the oxidation process of anthraquinone hydrogen peroxide production will flow from the tail gas inlet pipe 1 into the hot side inlet of the first condenser 2. At the same time, the cooling medium will flow in from the cold side inlet of the first condenser 2 and then be discharged from the cold side outlet of the first condenser 2. In the first condenser 2, the tail gas with a high temperature will exchange heat with the cooling medium, thereby cooling the tail gas to about 35°C so that some of the free water and aromatics in the tail gas will be condensed and liquefied. Then, the gas-liquid mixture formed by the condensation and liquefaction of the tail gas in the first condenser 2 will be discharged from the hot side outlet of the first condenser 2 and flow into the first gas-liquid separator 4 for gas-liquid separation. The liquid water and aromatics separated in the first gas-liquid separator 4 will be discharged from the drain port of the first gas-liquid separator 4 into a storage tank for storage. The remaining tail gas separated in the first gas-liquid separator 4 will be discharged from the exhaust port of the first gas-liquid separator 4 and then flow into the hot side inlet of the second condenser 3. The remaining tail gas flowing into the hot side inlet of the second condenser 3 will be cooled down to about 10°C, so that more free water and aromatics will be condensed and liquefied and precipitated. Then, the gas-liquid mixture formed by the condensation and liquefaction of the remaining tail gas in the second condenser 3 will be discharged from the hot side outlet of the second condenser 3 and flow into the second gas-liquid separator 5 for gas-liquid separation. The liquid water and aromatics separated in the second gas-liquid separator 5 will be discharged from the drain port of the second gas-liquid separator 5 into a storage tank for storage. The gas separated in the second gas-liquid separator 5 will be discharged from the exhaust port of the second gas-liquid separator 5 and flow through the first branch 9 before flowing into the air inlet of the expansion generator set 7. In the expander generator set 7, the gas flowing in from the inlet of the expander generator set 7 is used as the working fluid to expand and perform work, thereby generating electricity. After power generation, the working fluid gas will experience a pressure reduction and a temperature drop to 0-5℃. The remaining small amount of free water and aromatics in the gas will condense into droplets. The gas containing droplets will then be discharged from the outlet of the expander generator set 7 and flow into the third gas-liquid separator 6 for gas-liquid separation. The liquid water and aromatics separated in the third gas-liquid separator 6 will be discharged from the outlet of the third gas-liquid separator 6 into a storage tank for storage. The low-temperature gas separated in the third gas-liquid separator 6 will be discharged from the exhaust outlet of the third gas-liquid separator 6 and then flow into the cold-side inlet of the second condenser 3, and finally be discharged into the exhaust gas generator set 8 from the cold-side outlet of the second condenser 3. Therefore, in the second condenser 3, the remaining exhaust gas flowing in from the hot-side inlet of the second condenser 3 exchanges heat with the low-temperature gas flowing in from the cold-side inlet of the second condenser 3, thereby cooling the remaining exhaust gas flowing in from the hot-side inlet of the second condenser 3 to approximately 10℃. Then the gas discharged from the cold side outlet of the second condenser 3 into the exhaust gas generator unit 8 will be treated by the exhaust gas generator unit 8 to meet the standards before being discharged.In this embodiment, the exhaust gas undergoes cooling and condensation once in the first condenser 2 before entering the expander generator set 7, and then again in the second condenser 3. Finally, the exhaust gas undergoes another cooling and condensation in the expander generator set 7. This significantly improves the condensation and liquefaction rate of aromatics in the exhaust gas, thereby greatly increasing the recovery rate of aromatics and achieving efficient recovery of aromatics from the exhaust gas, avoiding waste. Furthermore, the second condenser 3 can recover and utilize the cold energy in the gas discharged from the expander generator set 7, avoiding waste and reducing the need for external refrigeration, thus saving refrigeration energy consumption. Additionally, when the expander generator set 7 is in a shutdown state, the first valve 10 is closed and the second valve 12 is opened. At this time, the gas separated in the second gas-liquid separator 5 is discharged from the exhaust port of the second gas-liquid separator 5 and flows directly through the second branch 11 before entering the exhaust gas generator set 8. After treatment by the exhaust gas generator set 8, the gas is discharged after meeting the standards.

[0058] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for treating oxidation tail gas and generating electricity in hydrogen peroxide production, characterized in that, It includes an exhaust gas inlet pipe (1), a first condenser (2), a second condenser (3), a first gas-liquid separator (4), a second gas-liquid separator (5), a third gas-liquid separator (6), a storage tank, an expansion generator set (7), and an exhaust gas generator set (8). The cold-side inlet of the first condenser (2) is used to receive the cooling medium, and the cold-side outlet of the first condenser (2) is used to discharge the cooling medium. The hot-side inlet of the first condenser (2) is connected to the exhaust gas inlet pipe (1), and the hot-side outlet of the first condenser (2) is connected to the inlet of the first gas-liquid separator (4). The drain port of the first gas-liquid separator (4) is connected to the storage tank. The exhaust port of the first gas-liquid separator (4) is connected to the hot-side inlet of the second condenser (3), and the hot-side outlet of the second condenser (3) is connected to the inlet of the second gas-liquid separator (5). The drain port of the second gas-liquid separator (5) is connected to the storage tank. The exhaust port is connected to the air inlet of the expansion generator set (7) through the first branch (9), and the first valve (10) is connected in the first branch (9). The exhaust port of the second gas-liquid separator (5) is also connected to the inlet of the exhaust gas generator set (8) through the second branch (11), and the second valve (12) is connected in the second branch (11). The air outlet of the expansion generator set (7) is connected to the inlet of the third gas-liquid separator (6). The liquid outlet of the third gas-liquid separator (6) is connected to the storage tank. The exhaust port of the third gas-liquid separator (6) is connected to the cold side inlet of the second condenser (3). The cold side outlet of the second condenser (3) is connected to the inlet of the exhaust gas generator set (8).

2. The device for treating oxidation tail gas and generating electricity in hydrogen peroxide production according to claim 1, characterized in that, Both the first valve (10) and the second valve (12) are solenoid valves.

3. The device for treating oxidation tail gas and generating electricity in hydrogen peroxide production according to claim 2, characterized in that, It also includes a controller and a speed sensor; The speed sensor is connected to the turbine generator in the expansion generator set (7) and is used to detect the speed information of the turbine generator. The speed sensor is also connected to the controller and is used to send the measured speed information of the turbine generator to the controller. The controller is connected to the first valve (10) and the second valve (12) respectively and is used to control the opening and closing of the first valve (10) and the second valve (12) according to the measured speed information of the turbine generator.

4. The device for treating oxidation tail gas and generating electricity in hydrogen peroxide production according to claim 1, characterized in that, The exhaust gas generator set (8) includes a fourth gas-liquid separator (13) and a carbon fiber adsorption box (14). The exhaust port of the second gas-liquid separator (5) is connected to the inlet of the fourth gas-liquid separator (13) through the second branch (11). The cold side outlet of the second condenser (3) is also connected to the inlet of the fourth gas-liquid separator (13). The exhaust port of the fourth gas-liquid separator (13) is connected to the air inlet of the carbon fiber adsorption box (14). The carbon fiber adsorption box (14) has an exhaust port for discharging the gas after adsorption treatment.

5. The device for treating oxidation tail gas and generating electricity in hydrogen peroxide production according to claim 4, characterized in that, The air inlet of the carbon fiber adsorption box (14) is connected to a third valve (15), and the exhaust port of the carbon fiber adsorption box (14) is connected to a fourth valve (16).

6. The device for treating oxidation tail gas and generating electricity in hydrogen peroxide production according to claim 5, characterized in that, The exhaust gas generator set (8) also includes a steam inlet pipe (17), a third condenser (18), and a stratified tank (19). The steam inlet pipe (17) is connected to the steam inlet of the carbon fiber adsorption box (14); The desorption outlet of the carbon fiber adsorption box (14) is connected to the feed inlet of the third condenser (18); The outlet of the third condenser (18) is connected to the layered tank (19); The steam inlet of the carbon fiber adsorption box (14) is connected to a fifth valve (20). The desorption outlet of the carbon fiber adsorption box (14) is connected to a sixth valve (21).

7. The device for treating oxidation tail gas and generating electricity in hydrogen peroxide production according to claim 6, characterized in that, It also includes waste liquid tanks (22); The upper end of the layered trough (19) has a material outlet for discharging the upper layer material; The bottom of the layered tank (19) is provided with a waste liquid outlet connected to the inlet of the waste liquid tank (22); The outlet of the waste liquid tank (22) is used to connect to the sewage pool.

8. The device for treating oxidation tail gas and generating electricity in hydrogen peroxide production according to claim 6, characterized in that, The exhaust gas generator set (8) includes at least two of the carbon fiber adsorption boxes (14). The exhaust port of the fourth gas-liquid separator (13) is connected to the air inlet of each of the carbon fiber adsorption boxes (14), the steam inlet pipe (17) is connected to the steam inlet of each of the carbon fiber adsorption boxes (14), the desorption outlet of each of the carbon fiber adsorption boxes (14) is connected to the feed inlet of the third condenser (18), the air inlet of each of the carbon fiber adsorption boxes (14) is connected to a third valve (15), the exhaust port of each of the carbon fiber adsorption boxes (14) is connected to a fourth valve (16), the steam inlet of each of the carbon fiber adsorption boxes (14) is connected to a fifth valve (20), and the desorption outlet of each of the carbon fiber adsorption boxes (14) is connected to a sixth valve (21).

9. The device for treating oxidation tail gas and generating electricity in hydrogen peroxide production according to claim 6, characterized in that, The inlet of the third condenser (18) is connected to the cooling water inlet pipe, and the outlet of the third condenser (18) is connected to the cooling water outlet pipe.

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