An exhaust gas purification device for hydrogen peroxide and its purification method

Abstract

The present invention discloses an exhaust gas purification device for hydrogen peroxide and a purification method thereof. The exhaust gas purification device includes: a condenser, an enrichment mechanism, a pressure swing adsorption mechanism, and a gas recovery and storage mechanism; a medium flow area for providing the flow of a heat exchange medium is arranged on the condenser. A cooling medium inlet is installed at one end of the medium flow area close to the top, and a cooling medium outlet is installed at the other end close to the bottom. An inlet three-way valve and a first outlet three-way valve are installed at the top of the condenser. This exhaust gas purification device can effectively remove aromatic hydrocarbon molecules in the exhaust gas and respectively achieve the effects of recovering oxygen and nitrogen. Moreover, before adsorbing the aromatic hydrocarbon molecules in the exhaust gas, the exhaust gas is first introduced into the condenser to condense and remove the moisture in the exhaust gas, avoiding water molecules occupying active sites on the adsorbent material, preventing the existence of a competitive relationship between water molecules and aromatic hydrocarbon molecules on the adsorbent material, and helping to improve the adsorption amount and adsorption efficiency of aromatic hydrocarbon molecules in subsequent adsorption.

Description

Technical Field

[0001] The present invention relates to the technical field of gas purification, and particularly to the separation of gases or vapors. Specifically, it is an exhaust gas purification device for hydrogen peroxide and its purification method. Background Art

[0002] Hydrogen peroxide is an inorganic compound with the chemical formula H2O2. Pure hydrogen peroxide is a light blue viscous liquid that can be miscible with water in any proportion. It is a strong oxidizing agent, and its aqueous solution is commonly known as hydrogen peroxide water, which is a colorless and transparent liquid.

[0003] During the production process of hydrogen peroxide, especially when the anthraquinone method is used, the scenarios where waste gas is generated mainly concentrate on production stages such as hydrogenation and oxidation. In these stages, due to the participation of hydrogen and oxygen, and the recycling of working fluids (including heavy aromatic hydrocarbons, trioctyl phosphate, etc.), waste gas containing multiple gas components such as water vapor, oxygen, nitrogen, and aromatic hydrocarbon vapor is generated.

[0004] A Chinese invention patent with the publication number CN113368650B discloses an exhaust gas purification, recovery, and treatment device and method for hydrogen peroxide production, including a base. A condenser is installed on the top of the base. A control panel is installed at the middle position on the left side of the condenser. A pressure sensor is installed inside the condenser, and the pressure sensor is electrically connected to the control panel through a wire. A water vapor filtration component is installed on the top of the condenser. An inflation mechanism is arranged on the right side of the condenser, and a storage mechanism is arranged on the surface of the inflation mechanism. It has the advantage of recovering oxygen and nitrogen in the waste gas, and solves the problem of directly discharging the waste gas after simple treatment, wasting some recyclable gases.

[0005] This exhaust gas purification, recovery, and treatment device often only focuses on removing and recovering water vapor, oxygen, and nitrogen in the waste gas. However, the waste gas often contains aromatic hydrocarbon molecules. These aromatic hydrocarbon vapors not only pose a threat to the environment but may also have an adverse impact on the health of production personnel. This invention relies more on a single treatment method and lacks diversified and comprehensive treatment for different components and emission characteristics in the waste gas, thereby reducing the purification effect of the waste gas.

[0006] Therefore, it is necessary to improve the deficiencies in the prior art to solve the above problems. Summary of the Invention

[0007] The present invention overcomes the deficiencies of the prior art and provides an exhaust gas purification device for hydrogen peroxide and its purification method.

[0008] To achieve the above object, the technical solution adopted by the present invention is: an exhaust gas purification device for hydrogen peroxide, including: a condenser, an enrichment mechanism, a pressure swing adsorption mechanism, and a gas recovery and storage mechanism;

[0009] A medium flow area for providing the flow of heat exchange medium is provided on the condenser. A cooling medium inlet is installed at one end of the medium flow area close to the top, and a cooling medium outlet is installed at the other end close to the bottom. An inlet three-way valve and a first outlet three-way valve are installed at the top of the condenser;

[0010] Both ends of the inlet three-way valve are respectively communicated with the waste gas delivery pipe and the pressure swing adsorption mechanism. Both ends of the first outlet three-way valve are respectively communicated with the enrichment mechanism and the gas recovery and storage mechanism. The enrichment mechanism is communicated with the pressure swing adsorption mechanism;

[0011] The enrichment mechanism is used to increase the concentration of aromatic hydrocarbon molecules in the waste gas after condensation. The pressure swing adsorption mechanism is used to perform adsorption filtration by adapting the pressure according to the concentration of aromatic hydrocarbon molecules in the waste gas. The gas recovery and storage mechanism is used to store the oxygen and nitrogen recovered from the waste gas.

[0012] In a preferred embodiment of the present invention, the enrichment mechanism includes: an ejector assembly and an enrichment tank that are connected in sequence; the ejector assembly includes: a collecting pipe, a mixing pipe and a diffuser pipe that are sequentially arranged at one end of the collecting pipe; an ejector pipe for injecting nitrogen is fixed at the other end of the collecting pipe, and a connecting pipe is fixed on the side of the collecting pipe;

[0013] The cross-sectional shapes of one ends of the collecting pipe and the ejector pipe are both conical. The cross-sectional shape of the diffuser pipe is a horn structure with a gradually expanding cross-section. One end of the mixing pipe is fixed to the conical end of the collecting pipe, and the other end is fixed to the end with a smaller diameter of the diffuser pipe. The conical end of the ejector pipe penetrates into the interior of the collecting pipe.

[0014] In a preferred embodiment of the present invention, the first outlet three-way valve and the connecting pipe are communicated through a pipeline. A first air pump and a gas pressure reducing valve are sequentially installed on the pipeline between the first outlet three-way valve and the connecting pipe. The diffuser pipe and the enrichment tank are communicated through a pipeline. A one-way valve is installed on the pipeline between the diffuser pipe and the enrichment tank.

[0015] In a preferred embodiment of the present invention, a gas analyzer for detecting the concentration of aromatic hydrocarbon molecules in the gas is provided on the side of the enrichment tank.

[0016] In a preferred embodiment of the present invention, the pressure swing adsorption mechanism includes: an activated carbon adsorption tower and a gas compressor; the input end of the gas compressor is communicated with one end of the enrichment tank through a pipeline, and the output end is communicated with one end of the activated carbon adsorption tower through a pipeline; a pressure gauge is installed on the activated carbon adsorption tower.

[0017] In a preferred embodiment of the present invention, the activated carbon adsorption tower is connected to the inlet three-way valve through a pipeline, and a second air pump is installed on the pipeline between the activated carbon adsorption tower and the inlet three-way valve.

[0018] In a preferred embodiment of the present invention, the gas recovery and storage mechanism includes: an oxygen storage tank, a nitrogen storage tank, and a second outlet three-way valve; both ends of the second outlet three-way valve are connected to the oxygen storage tank and the nitrogen storage tank through pipelines respectively, the first outlet three-way valve and the second outlet three-way valve are connected through a pipeline, and a third air pump is installed on the pipeline between the first outlet three-way valve and the second outlet three-way valve.

[0019] In a preferred embodiment of the present invention, it further includes: a condensate recovery mechanism, and the condensate recovery mechanism includes: a recovery tank and a circulation pump; the input end of the circulation pump is connected to the bottom of the condenser through a pipeline, and the output end is connected to the recovery tank through a pipeline; a valve is installed on the pipeline between the circulation pump and the condenser.

[0020] The present invention provides a purification method for an exhaust gas purification device for hydrogen peroxide, including the following steps:

[0021] S1. The exhaust gas during hydrogen peroxide production is input from the exhaust gas delivery pipe through the inlet three-way valve to the condenser. A heat exchange circuit is formed by the cooling medium inlet, the medium flow area, and the cooling medium outlet for the cooling medium, so that the condenser is cooled below 0°C to condense and remove moisture from the exhaust gas.

[0022] S2. The exhaust gas after removing moisture is input through the first outlet three-way valve to the enrichment mechanism to increase the concentration of aromatic hydrocarbon molecules in the exhaust gas through the enrichment mechanism.

[0023] S3. The pressure is adapted according to the concentration of aromatic hydrocarbon molecules in the exhaust gas, and the exhaust gas is input to the pressure swing adsorption mechanism to adsorb and filter the aromatic hydrocarbon molecules.

[0024] S4. The filtered gas is input through the inlet three-way valve to the condenser, so that the condenser is cooled to between -183°C and -196°C to liquefy the oxygen in the gas. Through the first outlet three-way valve, the nitrogen in the condenser is input to the gas recovery and storage mechanism.

[0025] S5. After the recovery of nitrogen is completed, the condenser is heated above -183°C to vaporize the oxygen in the condenser. Through the first outlet three-way valve, the oxygen in the condenser is input to the gas recovery and storage mechanism, thereby completing the purification of the exhaust gas.

[0026] In a preferred embodiment of the present invention, in the step of S3, the adapted pressure specifically is: adapting the pressure value with the highest adsorption efficiency according to the concentration of aromatic hydrocarbon molecules in the exhaust gas.

[0027] The present invention solves the defects existing in the background art and has the following beneficial effects:

[0028] (1) The present invention provides an exhaust gas purification device for hydrogen peroxide and its purification method. By sequentially passing the exhaust gas in hydrogen peroxide production through the cooperation of a condenser, an enrichment mechanism, a pressure swing adsorption mechanism, and a gas recovery and storage mechanism, aromatic hydrocarbon molecules in the exhaust gas can be effectively removed, and the effects of recovering oxygen and nitrogen can be achieved respectively. Moreover, before adsorbing the aromatic hydrocarbon molecules in the exhaust gas, the exhaust gas is first passed into the condenser. Under the cooperation of the cooling medium inlet and the cooling medium inlet, the exhaust gas in the condenser is cooled to below 0 °C, which can condense and remove the moisture in the exhaust gas, avoid water molecules occupying active sites on the adsorbent material, prevent the existence of a competitive relationship between water molecules and aromatic hydrocarbon molecules on the adsorbent material, thereby reducing the interference of water molecules, and helping to improve the adsorption amount and adsorption efficiency of aromatic hydrocarbon molecules in subsequent adsorption.

[0029] (2) In the present invention, through the cooperation of the first outlet three-way valve, the first air pump, the gas pressure reducing valve, the check valve of the ejector assembly, and the enrichment tank, the aromatic hydrocarbon molecules in the condensed exhaust gas can be concentrated, improving their concentration in the gas phase, avoiding the situation that the aromatic hydrocarbon molecules after condensation treatment exist in the exhaust gas at a low concentration, reducing the contact opportunity between the subsequent adsorbent material and the aromatic hydrocarbon molecules, resulting in a decrease in adsorption efficiency. Furthermore, in the subsequent pressure swing adsorption process, the contact opportunity between the adsorbent material and the aromatic hydrocarbon molecules can be increased, which helps the adsorbent material to adsorb more aromatic hydrocarbon molecules within a limited capacity, thereby improving the separation effect and purity.

[0030] (3) In the present invention, when filtering the aromatic hydrocarbon molecules from the exhaust gas, the adsorption and separation of aromatic hydrocarbons are achieved by adjusting the appropriate pressure. Appropriate pressure can promote the diffusion and adsorption of aromatic hydrocarbon molecules on the surface of activated carbon, enabling the pressure swing adsorption process to proceed more efficiently, optimizing the adsorption cycle and desorption conditions, helping to improve the treatment efficiency and the aromatic hydrocarbon adsorption efficiency, and thus improving the overall exhaust gas purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0032] Figure 1 is the overall structural schematic diagram of the preferred embodiment of the present invention;

[0033] Figure 2Schematic diagram of the overall structure of the ejector assembly of the preferred embodiment of the present invention;

[0034] In the figure: 1. Condenser; 11. Cooling medium inlet; 12. Cooling medium outlet; 13. Inlet three-way valve; 14. First outlet three-way valve; 2. Enrichment mechanism; 21. Enrichment tank; 22. Collection pipe; 23. Mixing pipe; 24. Diffuser pipe; 25. Ejector pipe; 26. Connecting pipe; 27. First air pump; 28. Gas pressure reducing valve; 29. Check valve; 3. Pressure swing adsorption mechanism; 31. Activated carbon adsorption tower; 32. Gas compressor; 33. Pressure gauge; 34. Second air pump; 4. Gas recovery and storage mechanism; 41. Oxygen storage tank; 42. Nitrogen storage tank; 43. Second outlet three-way valve; 44. Third air pump; 5. Gas analyzer; 6. Recovery tank; 61. Circulation pump; 62. Valve. Detailed implementation manners

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Many specific details are set forth in the following description in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application 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 thus cannot be understood as limiting the protection scope of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0038] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0039] As Figure 1 shown, an exhaust gas purification device for hydrogen peroxide includes: a condenser 1, an enrichment mechanism 2, a pressure swing adsorption mechanism 3, and a gas recovery and storage mechanism 4; a medium flow area for providing the flow of a heat exchange medium is provided on the condenser 1. A cooling medium inlet 11 is installed at one end of the medium flow area close to the top, and a cooling medium outlet 12 is installed at the other end close to the bottom. An inlet three-way valve 13 and a first outlet three-way valve 14 are installed at the top of the condenser 1; both ends of the inlet three-way valve 13 are respectively communicated with an exhaust gas delivery pipe and the pressure swing adsorption mechanism 3, and both ends of the first outlet three-way valve 14 are respectively communicated with the enrichment mechanism 2 and the gas recovery and storage mechanism 4, and the enrichment mechanism 2 is communicated with the pressure swing adsorption mechanism 3; the enrichment mechanism 2 is used to increase the concentration of aromatic hydrocarbon molecules in the exhaust gas after condensation, the pressure swing adsorption mechanism 3 is used to perform adsorption filtration by adapting the pressure according to the concentration of aromatic hydrocarbon molecules in the exhaust gas, and the gas recovery and storage mechanism 4 is used to store the oxygen and nitrogen recovered from the exhaust gas.

[0040] It should be noted that the shape of the medium flow area is preferably serpentine to increase the contact area and improve the heat exchange effect. The cooling medium inlet 11, the medium flow area, and the cooling medium inlet 11 form a heat exchange circuit of the condenser 1. The cooling medium inlet 11 and the cooling medium inlet 11 are externally connected to a cooling medium temperature control and delivery device, which belongs to the prior art. Therefore, the control method and the structural principle are not explained in detail in the present application and are not elaborated here; through the cooperation of the exhaust gas purification device, the exhaust gas in hydrogen peroxide production is successively passed through the condenser 1, the enrichment mechanism 2, the pressure swing adsorption mechanism 3, and the gas recovery and storage mechanism 4, the aromatic hydrocarbon molecules in the exhaust gas can be effectively removed, and the effects of recovering oxygen and nitrogen can be achieved respectively. And before adsorbing the aromatic hydrocarbon molecules in the exhaust gas, the exhaust gas is first passed into the condenser 1. By using the cooling medium temperature control and delivery device externally connected to the cooling medium inlet 11 and the cooling medium inlet 11, the cooling medium can form a heat exchange circuit of the condenser 1 in the cooling medium inlet 11, the medium flow area, and the cooling medium inlet 11, so that the exhaust gas in the condenser 1 is cooled below 0 °C, the moisture in the exhaust gas can be condensed and removed, the water molecules are prevented from occupying the active sites on the adsorption material, and the competition relationship between the water molecules and the aromatic hydrocarbon molecules on the adsorption material is avoided, thereby reducing the interference of the water molecules and helping to improve the adsorption amount and adsorption efficiency of the aromatic hydrocarbon molecules in the subsequent adsorption.

[0041] As Figure 1 and Figure 2 shown, in some embodiments, the enrichment mechanism 2 includes: an ejector assembly and an enrichment tank 21 that are connected in sequence; the ejector assembly includes: a collecting pipe 22, a mixing pipe 23 and a diffuser pipe 24 that are sequentially arranged at one end of the collecting pipe 22; an ejector pipe 25 for injecting nitrogen is fixed at the other end of the collecting pipe 22, and a connecting pipe 26 is fixed to the side of the collecting pipe 22; the cross-sectional shapes of one ends of the collecting pipe 22 and the ejector pipe 25 are both conical, the cross-sectional shape of the diffuser pipe 24 is a horn structure with a gradually expanding cross-section, one end of the mixing pipe 23 is fixed to the conical end of the collecting pipe 22, and the other end is fixed to the end with a smaller diameter of the diffuser pipe 24, and the conical end of the ejector pipe 25 penetrates into the interior of the collecting pipe 22.

[0042] It should be noted that the first outlet three-way valve 14 is connected to the connecting pipe 26 through a pipeline. A first air pump 27 and a gas pressure reducing valve 28 are successively installed on the pipeline between the first outlet three-way valve 14 and the connecting pipe 26. The diffuser pipe 24 is connected to the enrichment tank 21 through a pipeline. A check valve 29 is installed on the pipeline between the diffuser pipe 24 and the enrichment tank 21. The inner diameters of the mixing pipe 23, the conical end of the collecting pipe 22, the smaller diameter end of the diffuser pipe 24, and the connecting pipe 26 are all preferably 10 - 40 mm. The inner diameters of the other end of the collecting pipe 22 and the smaller diameter end of the diffuser pipe 24 are both preferably 35 - 110 mm. One end of the ejector pipe 25 is externally connected to a nitrogen delivery device. At the same time, the first outlet three-way valve 14 is opened, and the connection direction is switched to the condenser 1 to the connecting pipe 26. The first air pump 27 is started to extract the moisture-removed waste gas from the condenser 1. After the pressure is reduced by the gas pressure reducing valve 28, it enters the connecting pipe 26 at a lower pressure. At the same time, the externally connected nitrogen delivery device delivers nitrogen to the ejector pipe 25 at a higher pressure. The nitrogen in the ejector pipe 25 will flow out of the conical end of the ejector pipe 25 at a higher speed and spray into the interior of the collecting pipe 22, and a low-pressure area will be formed at the conical end of the ejector pipe 25. Since the waste gas entering the collecting pipe 22 through the connecting pipe 26 is in a relatively high-pressure state, the waste gas and the aromatic hydrocarbon molecules in it will be attracted by the low-pressure area and accelerated into the nitrogen, and from the conical end of the collecting pipe 22, they will quickly enter the interior of the mixing pipe 23 through a flow channel with a gradually decreasing cross-sectional area, so that the nitrogen and the waste gas can perform heat transfer, mass transfer, equalize velocity, and equalize pressure. Then, it enters the interior of the diffuser pipe 24 from the interior of the mixing pipe 23 and passes through the check valve 29 on the pipeline, so that the aromatic hydrocarbon molecules in the gas are quickly and massively ejected and enriched inside the enrichment tank 21. It can concentrate the aromatic hydrocarbon molecules in the condensed waste gas, increase their concentration in the gas phase, avoid the aromatic hydrocarbon molecules after condensation treatment existing in the waste gas at a lower concentration, reduce the contact opportunity between the subsequent adsorption material and the aromatic hydrocarbon molecules, and cause the adsorption efficiency to decrease. Furthermore, in the subsequent pressure swing adsorption process, the contact opportunity between the adsorption material and the aromatic hydrocarbon molecules can be increased, which helps the adsorption material to adsorb more aromatic hydrocarbon molecules under a limited capacity, thereby improving the separation effect and purity.

[0043] Specifically, according to the continuity equation in fluid mechanics, when a gas passes through a contracting or expanding pipe, the flow velocity will change with the change of the pipe cross-sectional area. In the case of a pipe contraction, the flow velocity of the gas will increase because the gas flow rate must be equal at any two points in the pipe. The Bernoulli equation describes the relationship between the flow velocity, pressure, and fluid potential energy in an ideal fluid. When a gas flows from a larger pipe into a suddenly narrowed part, the flow velocity will increase, and at the same time, the pressure of the fluid will decrease. This pressure difference can push the gas to accelerate and flow out.

[0044] In some embodiments, a gas analyzer 5 for detecting the concentration of aromatic hydrocarbon molecules in the gas is provided on the side of the enrichment tank 21.

[0045] It should be noted that the gas analyzer 5 is used to directly measure the concentration of specific components or multiple components in the gas. Preferably, it is an infrared gas analyzer 5. Using the infrared absorption principle, it detects the concentration by measuring the specific absorption band of aromatic hydrocarbon molecules to infrared light, and can monitor the concentration of aromatic hydrocarbon molecules in the gas in the enrichment tank 21 in real time, so as to facilitate providing the concentration data of aromatic hydrocarbon molecules for the staff, so as to adapt the adsorption pressure subsequently.

[0046] In some embodiments, the pressure swing adsorption mechanism 3 includes: an activated carbon adsorption tower 31 and a gas compressor 32; the input end of the gas compressor 32 is communicated with one end of the enrichment tank 21 through a pipeline, and the output end is communicated with one end of the activated carbon adsorption tower 31 through a pipeline; a pressure gauge 33 is installed on the activated carbon adsorption tower 31.

[0047] It should be noted that when performing pressure swing adsorption on the waste gas, after determining the required adaptation pressure according to the concentration of aromatic hydrocarbon molecules in the waste gas, start the gas compressor 32 to reach the corresponding operating parameters (rotation speed, intake volume, etc.) to control the pressure of the output gas. The gas compressor 32 extracts the waste gas in the enrichment tank 21 through the pipeline at the input end, compresses it to reduce the volume of the waste gas and shorten the distance between molecules, completing the increase of the pressure of the waste gas. Through the pipeline at the output end, the waste gas is input into the activated carbon adsorption tower 31, so that when it adsorbs aromatic hydrocarbon molecules through the activated carbon adsorption tower 31, it adapts to the corresponding adsorption pressure, and then completes the adsorption of aromatic hydrocarbon molecules. At the same time, through the pressure gauge 33 on the activated carbon adsorption tower 31, it is convenient for the staff to monitor the internal pressure value.

[0048] In some embodiments, the activated carbon adsorption tower 31 is communicated with the inlet three-way valve 13 through a pipeline, and a second air pump 34 is installed on the pipeline between the activated carbon adsorption tower 31 and the inlet three-way valve 13; when the activated carbon adsorption tower 31 adsorbs and filters, open the inlet three-way valve 13, switch the communication direction to the activated carbon adsorption tower 31 to the condenser 1, start the second air pump 34, and extract the adsorbed gas from the activated carbon adsorption tower 31, which can be transported to the condenser 1 through the pipeline therebetween, so as to facilitate the subsequent gas recovery treatment.

[0049] In some embodiments, the gas recovery and storage mechanism 4 includes: an oxygen storage tank 41, a nitrogen storage tank 42 and a second outlet three-way valve 43; both ends of the second outlet three-way valve 43 are communicated with the oxygen storage tank 41 and the nitrogen storage tank 42 through pipelines respectively, and the first outlet three-way valve 14 and the second outlet three-way valve 43 are communicated through a pipeline, and a third air pump 44 is installed on the pipeline between the first outlet three-way valve 14 and the second outlet three-way valve 43.

[0050] It should be noted that when the gas after adsorption and filtration is in the condenser 1 and the liquefaction of oxygen is completed, the first outlet three-way valve 14 is opened, and the connection direction is switched to the condenser 1 to the second outlet three-way valve 43. At the same time, the second outlet three-way valve 43 is opened, and the connection direction is switched to the first outlet three-way valve 14 to the nitrogen storage tank 42. The third air pump 44 on the pipeline between the first outlet three-way valve 14 and the second outlet three-way valve 43 is started, and the nitrogen gas that remains gaseous and separated in the condenser 1 is extracted, and can be transported through the pipeline between them to the nitrogen storage tank 42 for recovery. When the oxygen in the condenser 1 is re-vaporized, the first outlet three-way valve 14 is opened, and the connection direction is switched to the condenser 1 to the second outlet three-way valve 43. At the same time, the second outlet three-way valve 43 is opened, and the connection direction is switched to the first outlet three-way valve 14 to the oxygen storage tank 41. The third air pump 44 is started, and the oxygen in the condenser 1 is extracted, and can be transported through the pipeline between them to the oxygen storage tank 41 for recovery, so that the recovery and storage of oxygen and nitrogen can be completed respectively.

[0051] In some embodiments, it further includes: a condensate recovery mechanism, and the condensate recovery mechanism includes: a recovery tank 6 and a circulation pump 61; the input end of the circulation pump 61 is connected to the bottom of the condenser 1 through a pipeline, and the output end is connected to the recovery tank 6 through a pipeline; a valve 62 is installed on the pipeline between the circulation pump 61 and the condenser 1.

[0052] It should be noted that the types of the valve 62 include but are not limited to a check valve 29, a flow valve, a pneumatic valve, an electric valve or a stop valve, etc.; after the waste gas condensation or the recovery of oxygen is completed, the valve 62 installed on the pipeline between the circulation pump 61 and the condenser 1 is opened, the circulation pump 61 is started, the condensate water in the condenser 1 is extracted, and is transported to the inside of the recovery tank 6 through the output end of the circulation pump 61, so as to complete the recovery treatment of the condensate water.

[0053] The present invention provides a purification method for an exhaust gas purification device for hydrogen peroxide, including the following steps:

[0054] S1. The waste gas generated during the production of hydrogen peroxide is input into the condenser 1 through the waste gas conveying pipe and the inlet three-way valve 13. The cooling medium forms a heat exchange circuit through the cooling medium inlet 11, the medium flow area and the cooling medium outlet 12, so that the condenser 1 is cooled to below 0 °C, and the waste gas is condensed to remove moisture;

[0055] S2. The waste gas after removing moisture is input into the enrichment mechanism 2 through the first outlet three-way valve 14, and the concentration of aromatic hydrocarbon molecules in the waste gas is increased through the enrichment mechanism 2;

[0056] S3. According to the concentration of aromatic hydrocarbon molecules in the waste gas, the pressure is adapted, and the waste gas is input into the pressure swing adsorption mechanism 3 to adsorb and filter the aromatic hydrocarbon molecules;

[0057] S4. Input the filtered gas into the condenser 1 through the inlet three-way valve 13, cool the condenser 1 to a temperature between -183°C and -196°C to liquefy the oxygen in the gas, and then input the nitrogen in the condenser 1 into the gas recovery and storage mechanism 4 through the first outlet three-way valve 14;

[0058] S5. After the recovery of nitrogen is completed, heat up the condenser 1 to a temperature above -183°C to vaporize the oxygen in the condenser 1, and then input the oxygen in the condenser 1 into the gas recovery and storage mechanism 4 through the first outlet three-way valve 14, thereby completing the purification of the waste gas.

[0059] It should be noted that in step S3, the adapted pressure is specifically: the pressure value with the highest adsorption efficiency is adapted according to the concentration of aromatic hydrocarbon molecules in the waste gas; in steps S4 and S5, the temperature change process of the condenser 1 is carried out under standard atmospheric pressure.

[0060] Specifically, the adapted pressure is obtained through the following steps:

[0061] A1. Mix the aromatic hydrocarbon gas with the carrier gas to a concentration c1, set an adsorption pressure p1 in the adsorption column filled with the adsorption material, input the mixed gas of the aromatic hydrocarbon gas and the carrier gas into the adsorption column, measure the change in the concentration of aromatic hydrocarbon molecules before and after passing through the adsorption column, and calculate the adsorption amount k1;

[0062] A2. Keep the concentration c1 unchanged, input the pressure p2, and calculate the adsorption amount k2;

[0063] ……;

[0064] Keep the concentration c1 unchanged, input the pressure pn, and calculate the adsorption amount kn;

[0065] A3. Adjust the concentrations c1, c2, ……, cn of the mixture of the aromatic hydrocarbon gas and the carrier gas, repeat the steps of S11 and S12 to obtain the pressure and adsorption amount data at multiple concentrations;

[0066] A4. Organize all the obtained concentration, pressure, and adsorption amount data. For each pressure point, analyze the change trend of the adsorption amount at different concentrations to determine the adsorption saturation point. For each concentration point, analyze the adsorption efficiency at different pressures to determine the pressure value with the highest adsorption efficiency;

[0067] A5. Use mathematical methods to construct a three-dimensional relationship model of concentration, pressure, and adsorption efficiency. In the three-dimensional relationship model, identify the concentration and pressure regions where the adsorption efficiency always remains at a relatively high level. Select representative concentration and pressure points within this region, and verify for the selected concentration and pressure points to confirm the stability of the adsorption efficiency;

[0068] A6. According to the concentration of aromatic hydrocarbon molecules in the waste gas, use a three-dimensional relationship model to obtain the optimal pressure for the best adsorption efficiency.

[0069] It should be noted that in step A1, the carrier gas is preferably nitrogen, and the adsorbent material is preferably activated carbon, and the specific surface area, pore volume and pore size distribution of this activated carbon are the same as those of the activated carbon in the activated carbon adsorption tower 31;; In step A4, it is preferably organized in the form of a table or chart, and the adsorption efficiency is expressed by the ratio of the adsorption amount to the initial concentration; in step A5, the mathematical methods include but are not limited to interpolation and fitting, and the points of concentration and pressure should cover different concentration ranges.

[0070] In this embodiment, gas samples including aromatic hydrocarbon molecules with different concentrations and different pressure conditions can be covered, and the optimal pressure at each concentration can be obtained, and the relationship between concentration, pressure and adsorption efficiency can be constructed, which can be applied to the adsorption treatment of aromatic hydrocarbon molecules in different waste gases. Furthermore, according to the concentration of aromatic hydrocarbon molecules, the optimal pressure for the best adsorption efficiency can be obtained, so as to utilize the difference in the adsorption capacity of activated carbon for aromatic hydrocarbon molecules at different pressures, and realize the adsorption and separation of aromatic hydrocarbons by adjusting the optimal pressure. An appropriate pressure can promote the diffusion and adsorption of aromatic hydrocarbon molecules on the surface of activated carbon, making the pressure swing adsorption process can be carried out more efficiently, optimizing the adsorption cycle and desorption conditions, helping to improve the treatment efficiency and aromatic hydrocarbon adsorption efficiency, and thus improving the overall waste gas purification effect.

[0071] Based on the ideal embodiments of the present invention as an inspiration, through the above description, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0072] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An exhaust gas purification device for hydrogen peroxide, characterized in that, Including: A condenser, an enrichment mechanism, a pressure swing adsorption mechanism, and a gas recovery and storage mechanism; A medium flow area for providing the flow of a heat exchange medium is provided on the condenser. A cooling medium inlet is installed at one end of the medium flow area close to the top, and a cooling medium outlet is installed at the other end close to the bottom. An inlet three-way valve and a first outlet three-way valve are installed at the top of the condenser; both ends of the inlet three-way valve are respectively communicated with an exhaust gas delivery pipe and the pressure swing adsorption mechanism, both ends of the first outlet three-way valve are respectively communicated with the enrichment mechanism and the gas recovery and storage mechanism, and the enrichment mechanism is communicated with the pressure swing adsorption mechanism; The enrichment mechanism is used to increase the concentration of aromatic hydrocarbon molecules in the exhaust gas after condensation. The pressure swing adsorption mechanism is used to perform adsorption and filtration by adapting the pressure according to the concentration of aromatic hydrocarbon molecules in the exhaust gas. The gas recovery and storage mechanism is used to store the oxygen and nitrogen recovered from the exhaust gas; The enrichment mechanism includes: an ejector assembly and an enrichment tank that are connected in sequence; the ejector assembly includes: a collecting pipe, a mixing pipe and a diffuser pipe that are sequentially arranged at one end of the collecting pipe; an ejector pipe for injecting nitrogen is fixed at the other end of the collecting pipe, and a connecting pipe is fixed on the side of the collecting pipe; The cross-sectional shapes of one ends of the collecting pipe and the ejector pipe are both conical, the cross-sectional shape of the diffuser pipe is a trumpet structure with a gradually expanding cross-section, one end of the mixing pipe is fixed to the conical end of the collecting pipe, and the other end is fixed to the end with a smaller diameter of the diffuser pipe. The conical end of the ejector pipe penetrates into the interior of the collecting pipe; The first outlet three-way valve and the connecting pipe are communicated through a pipeline. A first air pump and a gas pressure reducing valve are sequentially installed on the pipeline between the first outlet three-way valve and the connecting pipe. The diffuser pipe and the enrichment tank are communicated through a pipeline. A check valve is installed on the pipeline between the diffuser pipe and the enrichment tank; The pressure swing adsorption mechanism includes: an activated carbon adsorption tower and a gas compressor; the input end of the gas compressor is communicated with one end of the enrichment tank through a pipeline, and the output end is communicated with one end of the activated carbon adsorption tower through a pipeline; a pressure gauge is installed on the activated carbon adsorption tower.

2. The waste gas purification device for hydrogen peroxide according to claim 1, wherein: A gas analyzer for detecting the concentration of aromatic hydrocarbon molecules in the gas is provided on the side of the enrichment tank.

3. The waste gas purification device for hydrogen peroxide according to claim 1, wherein: The activated carbon adsorption tower and the inlet three-way valve are communicated through a pipeline. A second air pump is installed on the pipeline between the activated carbon adsorption tower and the inlet three-way valve.

4. An exhaust gas purification device for hydrogen peroxide according to claim 1, characterized in that: The gas recovery and storage mechanism includes: an oxygen storage tank, a nitrogen storage tank and a second outlet three-way valve; both ends of the second outlet three-way valve are respectively communicated with the oxygen storage tank and the nitrogen storage tank through pipelines. The first outlet three-way valve and the second outlet three-way valve are communicated through a pipeline. A third air pump is installed on the pipeline between the first outlet three-way valve and the second outlet three-way valve.

5. An exhaust gas purification device for hydrogen peroxide according to claim 1, characterized in that: Also including: A condensate recovery mechanism, the condensate recovery mechanism includes: a recovery tank and a circulation pump; The input end of the circulation pump is communicated with the bottom of the condenser through a pipeline, and the output end is communicated with the recovery tank through a pipeline; a valve is installed on the pipeline between the circulation pump and the condenser.

6. A purification method for an exhaust gas purification device for hydrogen peroxide according to any one of claims 1-5, characterized in that, It includes the following steps: S1. The waste gas generated during hydrogen peroxide production is input into the condenser through the waste gas conveying pipe and the inlet three-way valve. The cooling medium forms a heat exchange circuit through the cooling medium inlet, the medium flow area, and the cooling medium outlet, so that the condenser is cooled below 0°C to condense and remove moisture from the waste gas. S2. The waste gas after moisture removal is input into the enrichment mechanism through the first outlet three-way valve, and the concentration of aromatic hydrocarbon molecules in the waste gas is increased through the enrichment mechanism. S3. The pressure is adapted according to the concentration of aromatic hydrocarbon molecules in the waste gas, and the waste gas is input into the pressure swing adsorption mechanism to adsorb and filter the aromatic hydrocarbon molecules. S4. The filtered gas is input into the condenser through the inlet three-way valve, so that the condenser is cooled to between -183°C and -196°C to liquefy the oxygen in the gas. Through the first outlet three-way valve, the nitrogen in the condenser is input into the gas recovery and storage mechanism. S5. After the recovery of nitrogen is completed, the condenser is heated to above -183°C to vaporize the oxygen in the condenser. Through the first outlet three-way valve, the oxygen in the condenser is input into the gas recovery and storage mechanism, thereby completing the purification of the waste gas.

7. The purification method of an exhaust gas purification device for hydrogen peroxide according to claim 6, characterized in that: In the step of S3, the adapted pressure is specifically: the pressure value with the highest adsorption efficiency is adapted according to the concentration of aromatic hydrocarbon molecules in the waste gas.

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