Ethylene oxide sterilization exhaust gas treatment system and treatment method

Abstract

This application relates to an ethylene oxide sterilization waste gas treatment system and method. The system includes a tower, a circulation tank, a circulating cooler, and a waste gas post-treatment device. An air inlet is located on one side of the tower, and a heater is installed at the inlet. The circulation tank is connected to the bottom of the tower and contains absorbent liquid. A demister layer, a spray gun, and a packing layer are sequentially arranged inside the tower. The spray gun is connected to the circulation tank via a circulating liquid pipe, and the circulating cooler is installed on the circulating liquid pipe. The top of the tower is connected to the waste gas post-treatment device. Ethylene oxide-containing waste gas enters the tower, undergoes mass transfer with the absorbent liquid sprayed from the spray gun, and then enters the waste gas post-treatment device for treatment and discharge. Carrier gas, after being heated, enters the tower, undergoes mass transfer with the ethylene oxide-containing absorbent liquid, and then enters the waste gas post-treatment device for treatment and discharge. This application solves the technical problem of equipment consuming large amounts of natural gas or electricity during periods without waste gas generation.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, and specifically to an ethylene oxide sterilization waste gas treatment system and method. Background Technology

[0002] Ethylene oxide (EO) is a widely used and highly effective sterilizing agent, commonly used in the medical device, pharmaceutical, and hygiene product industries. After the sterilization process, to remove residual ethylene oxide from the sterilization chamber and restore normal pressure, a vacuum pump is typically used to create a vacuum. This process generates vacuum pump exhaust gas containing a high concentration of ethylene oxide. Direct emission of ethylene oxide poses serious hazards to the environment and human health, and therefore requires treatment.

[0003] Because ethylene oxide sterilization exhaust gas has the characteristics of high concentration and discontinuous emission, in addition to expanding the treatment scale, equipment such as catalytic / high temperature oxidation furnaces must always maintain a high furnace temperature (usually 300~850℃), which results in the equipment consuming a large amount of natural gas or electricity during the time when no exhaust gas is generated. Summary of the Invention

[0004] In view of this, in order to solve the problem of the equipment consuming a large amount of energy such as natural gas or electricity during periods when no waste gas is generated, This application provides an ethylene oxide sterilization waste gas treatment system, including a tower body, a circulation tank, a circulation cooler, and a waste gas post-treatment device. The tower body has a preset height, and an air inlet is opened on one side of the tower body. A heater is installed on the air inlet. The circulation tank is connected to the bottom of the tower body and contains absorbent liquid. From top to bottom, a demister layer, a spray gun, and a packing layer are arranged in sequence inside the tower body. The spray gun is connected to the circulation tank through a circulation liquid pipe, and the circulation cooler is installed on the circulation liquid pipe. The top of the tower body is connected to the waste gas post-treatment device. Ethylene oxide-containing waste gas enters the tower body through the air inlet, undergoes mass transfer with the absorbent liquid sprayed by the spray gun, and then enters the waste gas post-treatment device for treatment and discharge. The absorbent liquid absorbs part of the ethylene oxide in the waste gas and falls into the circulation tank. Carrier gas is heated through the air inlet and enters the tower body, undergoes mass transfer with the absorbent liquid that has absorbed ethylene oxide, and carries the ethylene oxide into the waste gas post-treatment device for treatment and discharge.

[0005] In one possible implementation, the area of ​​the top of the circulation trough is larger than the area of ​​the bottom of the tower body, and the tower body is disposed on one side of the top of the circulation trough.

[0006] In one possible implementation, a stirrer is also provided, which is located in the middle of the circulation tank. A circulation pump is also provided in the circulation tank, and the circulation pump is connected to the circulation liquid pipe.

[0007] In one possible implementation, a water inlet is provided on one side of the circulation tank and connected to an external water supply pipe; a drain outlet is provided at the bottom of the circulation tank and connected to an external drain outlet 270.

[0008] In one possible implementation, the air inlet of the tower body is located below the packing layer, and the air inlet of the tower body is connected to the main air inlet pipe, which is also connected to the exhaust gas pipe and the carrier gas pipe.

[0009] In one possible implementation, the waste gas aftertreatment device includes an oxidizer and a chimney connected in sequence by pipelines, and the oxidizer is connected to the top of the tower by pipelines.

[0010] A method for treating ethylene oxide sterilization waste gas, comprising the above-mentioned ethylene oxide sterilization waste gas treatment system, specifically including the following steps: S1: Waste gas containing ethylene oxide enters the main inlet pipe through the waste gas pipe, and then enters the tower body through the main inlet pipe; S2: Absorbent liquid in the circulating tank is drawn into the circulating liquid pipe by a circulating pump, and cooled by a circulating cooler; S3: The cooled absorbent liquid is sprayed into the tower body through a spray gun, contacting the ethylene oxide-containing waste gas in the tower to obtain pretreated gas and absorbent liquid containing ethylene oxide; S4: The pretreated gas passes through a demister and enters the waste gas post-treatment device. After treatment, the ethylene oxide-containing absorbent enters the circulation tank for the next cycle; S6: When the sterilization chamber of the client stops working and no longer produces high-concentration waste gas, the system automatically switches to the desorption stage. The carrier gas enters the main inlet pipe through the carrier gas pipe and then enters the tower body, where it comes into contact with the ethylene oxide-containing absorbent, resulting in a carrier gas containing ethylene oxide and an absorbent free of ethylene oxide; S7: The ethylene oxide-containing carrier gas enters the waste gas post-treatment device through the demister for treatment and is then discharged. The absorbent free of ethylene oxide enters the circulation tank for the next cycle.

[0011] In one possible implementation, S1 further includes that the heater does not heat when the waste gas containing ethylene oxide enters the main inlet pipe through the waste gas pipe; S6 further includes that the heater starts heating when the carrier gas enters the main inlet pipe through the carrier gas pipe and then enters the tower body.

[0012] In one feasible manner, in S3, the cooled absorbent is sprayed into the tower body through a spray gun, forming a countercurrent contact with the ethylene oxide-containing waste gas in the packing layer.

[0013] In one feasible approach, in S7, when the absorbent is insufficient, it is replenished through the water inlet.

[0014] The beneficial effects of this invention are as follows: It comprises a tower body, a circulation tank, a circulation cooler, and a waste gas after-treatment device. The tower body has a preset height, with an air inlet on one side and a heater installed at the inlet. The circulation tank is connected to the bottom of the tower body and contains absorbent liquid. From top to bottom, the tower body contains a demister layer, a spray gun, and a packing layer. The spray gun is connected to the circulation tank via a circulation liquid pipe, and the circulation cooler is installed on the circulation liquid pipe. The top of the tower body is connected to the waste gas after-treatment device. Waste gas containing ethylene oxide enters the tower body through the air inlet. At this time, the heater does not heat the gas. After mass transfer with the absorbent liquid sprayed by the spray gun in the packing layer, and after absorption by the absorbent liquid, the concentration of ethylene oxide in the waste gas continuing to flow to the top of the tower body is greatly reduced, thus reducing the volume of the subsequent after-treatment equipment. When the sterilization chamber stops working, the exhaust gas inlet is shut off, and carrier gas capable of carrying ethylene oxide is introduced into the tower. Specifically, the carrier gas is heated through the inlet before entering the tower. At this time, the heater heats the carrier gas. After the heated carrier gas comes into contact with the absorbent containing ethylene oxide, the ethylene oxide in the absorbent is released into the carrier gas. The carrier gas, carrying the ethylene oxide, enters the exhaust gas after-treatment device for treatment and discharge. Through this process, the concentration and flow rate of the exhaust gas entering the subsequent after-treatment process are "smoothed out," and the exhaust gas after-treatment device can operate stably with lower energy consumption. Because the concentration of ethylene oxide in the exhaust gas is smooth and low after treatment, the volume of the required after-treatment equipment is also greatly reduced. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of this application. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention or to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," "linking," "hinging," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Example 1 like Figure 1As shown, the ethylene oxide sterilization exhaust gas treatment system includes a tower body 100, a circulation tank 200, a circulating cooler 220, and an exhaust gas after-treatment device 300. The tower body 100 has a preset height, and an air inlet is opened on one side of the tower body 100. A heater 172 is installed on the air inlet. The circulation tank 200 is connected to the bottom of the tower body 100 and contains an absorbent liquid. Inside the tower body 100, from top to bottom, a demister layer 110, a spray gun 120, and a packing layer 130 are arranged sequentially. The spray gun 120 is connected to the circulation tank 200 through a circulating liquid pipe 210. Cooler 220 is installed on circulating liquid pipe 210; the top of tower body 100 is connected to waste gas after-treatment device 300; waste gas containing ethylene oxide enters the tower body through the air inlet, undergoes mass transfer with the absorbent sprayed by spray gun 120, and then enters the waste gas after-treatment device 300 for treatment and discharge. The absorbent absorbs part of the ethylene oxide in the waste gas and falls into the circulating tank 200; carrier gas is heated through the air inlet and enters the tower body 100, reacts with the absorbent that has absorbed ethylene oxide, and carries the ethylene oxide into the waste gas after-treatment device 300 for treatment and discharge.

[0022] Specifically, such as Figure 1As shown, the ethylene oxide sterilization exhaust gas treatment system mainly includes a tower body 100, a circulation tank 200, a circulating cooler 220, and an exhaust gas after-treatment device 300. An air inlet 140 is provided on one side of the tower body 100, which is connected to a main air inlet pipe 150. The tower body 100 has a preset height. Inside the tower body 100, a demister layer 110, a spray gun 120, and a packing layer 130 are arranged. The demister layer 110 is located at the upper part of the tower body 100, the spray gun 120 is located below the demister layer 110 and at a preset distance from it, and the packing layer 130 is located below the spray gun 120 and at a preset distance from it. The bottom of the tower body 100 is connected to the circulation tank 200, which contains absorbent liquid. A circulation pipe 210 is also installed on the circulation tank 200, connected to the circulation tank 200 and linked to a spray gun 120. This arrangement allows the absorbent liquid in the circulation tank 200 to be transferred to the spray gun 120 via the circulation pipe 210, and then sprayed onto the tower body 100. A circulating cooler 220 is installed on the circulation pipe 210 to cool the absorbent liquid. More specifically, the waste gas containing ethylene oxide enters the tower body 100 through the main inlet pipe 150. At this time, the heater 172 does not heat the gas. The waste gas containing ethylene oxide rises along the height of the tower body 100. At this time, the absorbent enters the spray gun 120 through the circulating liquid pipe 210. The spray gun 120 sprays the absorbent. In the packing layer 130, the waste gas containing ethylene oxide comes into contact with the absorbent. The absorbent absorbs the ethylene oxide, greatly reducing the concentration of ethylene oxide in the waste gas, resulting in pretreated gas. The pretreated gas passes through the demister layer 110 and enters the waste gas post-treatment device 300. After being treated by the waste gas post-treatment device 300, it is discharged. The principle is that ethylene oxide has high solubility in a specific absorbent, and the ethylene oxide molecules in the waste gas containing ethylene oxide are rapidly transferred from the gas phase to the liquid phase and absorbed. At this point, the absorbent contains ethylene oxide, forming an ethylene oxide-containing absorbent. The ethylene oxide-containing absorbent falls into the circulation tank 200 for the next cycle. It should be noted that the reaction between the absorbent and the waste gas containing ethylene oxide is usually an exothermic process. To prevent the absorbent from becoming too hot after absorbing ethylene oxide, a circulating cooler 220 is installed to cool the ethylene oxide-containing absorbent to a suitable temperature, usually 15 to 30 degrees Celsius.

[0023] When production of waste gas containing ethylene oxide ceases, carrier gas is introduced. Upon introduction, heater 172 begins heating, raising the carrier gas temperature. Simultaneously, the introduction of carrier gas reduces the partial pressure of ethylene oxide in the gas phase. Under the combined effects of temperature and gas-liquid equilibrium, ethylene oxide escapes from the liquid phase (i.e., from the absorbent containing ethylene oxide) and transfers back into the gas phase (i.e., the carrier gas). The carrier gas now contains ethylene oxide and, carrying the ethylene oxide, passes through the demister 110 before entering the waste gas aftertreatment device 300 for processing and discharge.

[0024] Through the above settings, peak values ​​are reduced and fluctuations are smoothed out: the discontinuous, high-concentration waste gas containing ethylene oxide is transformed into a stable flow with a moderate concentration, eliminating the "peak" of waste gas emissions. The concentration and flow rate of ethylene oxide in the waste gas have been "smoothed out," and the waste gas after-treatment device 300 can operate stably with lower energy consumption.

[0025] In one possible implementation, the area of ​​the top of the circulation tank 200 is larger than the area of ​​the bottom of the tower body 100, and the tower body 100 is located on one side of the top of the circulation tank 200. An agitator 240 is also provided, positioned in the middle of the circulation tank 200. A circulation pump 230 is also provided within the circulation tank 200, and the circulation pump 230 is connected to the circulation liquid pipe 210. It should be noted that a standby circulation pump 250 is also provided, and the standby circulation pump 250 is connected to the circulation liquid pipe 210.

[0026] Specifically, such as Figure 1 As shown, the circulating liquid pipe 210 needs to be installed outside the tower body 100. To allow space for the circulating liquid pipe 210, the area of ​​the top of the circulation tank 200 is larger than the area of ​​the bottom of the tower body 100, and the tower body 100 is located on one side of the top of the circulation tank 200. The circulating liquid pipe 210 is connected to the other side of the top of the circulation tank 200. To achieve the circulation of the absorbent, a circulation pump 230 is installed in the circulation tank 200. The circulation pump 230 is located within the liquid surface of the absorbent and is connected to the circulating liquid pipe 210. It should be noted that after the absorbent absorbs ethylene oxide, its temperature rises and it falls into the circulation tank 200. To ensure that the temperature of the absorbent in the circulation tank 200 is uniform, a stirrer 240 is installed to stir it, making the temperature of the liquid in the circulation tank 200 uniform and enhancing gas-liquid contact.

[0027] In one feasible embodiment, a water inlet 260 is provided on one side of the circulation tank 200, which is connected to an external water supply pipe; a drain outlet 270 is provided at the bottom of the circulation tank 200, which is connected to an external drain outlet 270. The air inlet 140 of the tower body 100 is located below the packing layer 130, and the air inlet 140 of the tower body 100 is connected to the main air inlet pipe 150, which is also connected to the exhaust gas pipe 160 and the carrier gas pipe 170.

[0028] Specifically, such as Figure 1 As shown, after a period of operation, the absorbent in the circulation tank 200 needs to be replaced or emptied. Therefore, a drain port 270 is provided at the bottom of the circulation tank 200, which is connected to an external pipe to replace or empty the absorbent and other contaminants in the circulation tank 200 as needed. Simultaneously, during operation, after multiple circulations of the absorbent containing ethylene oxide, the liquid level drops, causing the circulation pump 230 to be unable to pump the absorbent. Therefore, a water inlet 260 is provided on the other side of the circulation tank 200, connected to an external water supply pipe, to replenish or replace the absorbent containing ethylene oxide in a timely manner. To ensure the integrity of the overall structure, the air inlet 140 of the tower body 100 is located below the packing layer 130. This arrangement ensures that the gas entering the tower body 100 contacts the packing layer 130 and the absorbent containing ethylene oxide. To allow the carrier gas and the ethylene oxide-containing waste gas to enter the tower body 100 separately, the inlet 140 of the tower body 100 is connected to the main inlet pipe 150. The main inlet pipe 150 is also connected to the waste gas pipe 160 and the carrier gas pipe 170. A waste gas switching valve 161 is installed on the waste gas pipe 160, and a carrier gas switching valve 171 is installed on the carrier gas pipe to facilitate gas switching. Furthermore, a heater 172 is installed on the carrier gas pipe 170, allowing for more accurate heating of the carrier gas.

[0029] In one possible implementation, the exhaust gas aftertreatment device 300 includes an oxidizer and a chimney connected in sequence by pipelines, and the oxidizer is connected by pipelines to the top of the tower body 100.

[0030] Specifically, such as Figure 1 As shown, the pretreated gas and the carrier gas containing ethylene oxide obtained after the above treatment are both fed into the exhaust gas aftertreatment device 300 through external pipelines for further treatment, and finally discharged after meeting the emission standards. The exhaust gas aftertreatment device 300 includes an oxidizer and a chimney connected in sequence by pipelines. That is to say, the pretreated gas and the carrier gas containing ethylene oxide first enter the oxidizer for oxidation reaction, and then the gas that meets the emission standards enters the chimney for discharge. It should be noted that the exhaust gas aftertreatment device 300 is existing technology and will not be described in detail here.

[0031] Example 2 A method for treating ethylene oxide sterilization waste gas, the aforementioned ethylene oxide sterilization waste gas treatment system, specifically includes the following steps: S1: Waste gas containing ethylene oxide enters the main inlet pipe 150 through the waste gas pipe 160, and then enters the tower body 100 through the main inlet pipe 150; S2: The absorbent liquid in the circulation tank 200 is drawn by the circulation pump 230 and enters the circulation liquid pipe 210, where it is cooled by the circulation cooler 220; S3: The cooled absorbent liquid is sprayed into the tower body 100 through the spray gun 120, contacting and transferring mass with the ethylene oxide-containing waste gas in the tower to obtain pretreated gas and absorbent liquid containing ethylene oxide; S4: The pretreated gas passes through the demister and enters the waste gas... After treatment by the treatment device 300, the ethylene oxide-containing absorbent enters the circulation tank 200 for the next cycle; S6: When the sterilization chamber of the client stops working and no longer produces high-concentration waste gas, the system automatically switches to the desorption stage. The carrier gas enters the main inlet pipe 150 through the carrier gas pipe 170 and then enters the tower body 100, where it contacts the ethylene oxide-containing absorbent for mass transfer, resulting in a carrier gas containing ethylene oxide and an absorbent free of ethylene oxide; S7: The carrier gas containing ethylene oxide enters the waste gas post-treatment device 300 through the demister for treatment and is then discharged. The absorbent free of ethylene oxide enters the circulation tank 200 for the next cycle.

[0032] S1 also includes that when the waste gas containing ethylene oxide enters the main inlet pipe 150 through the waste gas pipe 160, the heater 172 does not heat; S6 also includes that when the carrier gas enters the main inlet pipe 150 through the carrier gas pipe 170 and then enters the tower body 100, the heater 172 starts to heat.

[0033] In S3, the cooled absorbent is sprayed into the tower body 100 through the spray gun 120, and forms a countercurrent contact with the ethylene oxide-containing waste gas in the packing layer 130.

[0034] In S7, when the absorbent is insufficient, it is replenished through the water inlet 260.

[0035] The more specific steps are as follows: The entire process is divided into two phases: the first is the absorption phase, and the second is the analysis phase.

[0036] The absorption phase is as follows: When the sterilization chamber at the client end completes the sterilization process and begins vacuuming and exhausting, the system enters the absorption phase. The waste gas switching valve 161 opens, and the carrier gas switching valve 171 closes. At this time, high-concentration ethylene oxide waste gas (i.e., waste gas containing ethylene oxide) from the sterilization chamber enters the tower 100 through the lower inlet 140 of the tower body 150 via the main inlet pipe 150. The circulating pump 230 is in the on state (the standby circulating pump 230 is redundant), drawing the absorbent liquid from the circulating tank 200 into the circulating liquid pipe 210. After being cooled by heat exchange in the circulating cooler 220, the absorbent liquid is transported to the spray gun 120 inside the tower body 100, and finally sprayed downwards by the spray gun 120. The ethylene oxide-containing waste gas flows from bottom to top within the tower body 100, while the absorbent liquid flows from top to bottom on the surface of the packing layer 130, forming a counter-current contact between the two within the packing layer 130. Because ethylene oxide has high solubility in a specific absorbent, ethylene oxide molecules in the waste gas containing ethylene oxide rapidly transfer from the gas phase to the liquid phase and are absorbed (i.e., absorbed by the absorbent). The process of ethylene oxide dissolving in the absorbent is usually exothermic. To prevent the absorbent containing ethylene oxide from becoming too hot, which could lead to a decrease in absorption efficiency or desorption of ethylene oxide, the circulating cooler 220 is turned on to cool the high-temperature circulating liquid that has absorbed ethylene oxide to a suitable temperature (e.g., 15℃-30℃) before re-spraying. The pretreated gas (i.e., the waste gas after reacting with the absorbent) passes through a demister to remove entrained droplets and is then discharged to the waste gas post-treatment device 300 for further treatment before being transported to the chimney by the system fan and discharged into the atmosphere. Meanwhile, the ethylene oxide is enriched and stored in the ethylene oxide-containing absorbent in the circulating tank 200, achieving the "elimination" of waste gas peaks and the "storage" of pollutants.

[0037] Desorption Phase: When the sterilization chamber at the client stops operating and no longer produces high-concentration waste gas, the system automatically switches to the desorption phase. Waste gas switching valve 161 closes, and carrier gas switching valve 171 opens. At this time, the carrier gas enters the tower body 100 through the main inlet pipe 150. The circulating pump 230 continues to operate, maintaining the circulating spray of liquid. Unlike the absorption phase, in this phase, the heater 172 is turned on to increase and maintain the carrier gas temperature. At the same time, the introduction of the carrier gas reduces the partial pressure of ethylene oxide in the gas phase. Under the dual effects of temperature and gas-liquid equilibrium, ethylene oxide escapes from the liquid phase and transfers back to the gas phase (that is, ethylene oxide transfers from the absorbent liquid to the carrier gas). The stirrer 240 is turned on in both phases to homogenize the liquid temperature in the circulating tank 200 and enhance gas-liquid contact. It should be noted that by adjusting the power of the heater 172 and the carrier gas inlet flow rate, the concentration and desorption rate of the desorbed ethylene oxide gas phase can be flexibly controlled. This transforms the originally intermittent exhaust gas into a continuous stream of exhaust gas with moderate concentration and stable flow. This gas is then introduced into the exhaust gas after-treatment device 300 and finally transported to the chimney by the system fan before being discharged into the atmosphere. Because the exhaust gas concentration and flow rate have been "smoothed out" at this point, the exhaust gas after-treatment device 300 can operate stably with lower energy consumption.

[0038] This application addresses the issue of peak emission reduction and fluctuation smoothing by converting discontinuous, high-concentration ethylene oxide-containing waste gas into a stable, low-concentration airflow, thus eliminating emission peaks. This reduces equipment investment: the waste gas after-treatment unit does not need to be designed according to peak flow rates, significantly reducing equipment size and saving on purchase costs. It also saves energy and reduces consumption by avoiding prolonged high-temperature standby of the waste gas after-treatment unit, significantly reducing auxiliary equipment consumption and operating costs. Furthermore, it offers high equipment flexibility: adaptable to different sterilization capacities and emission cycles, dynamically matching parameters such as carrier gas temperature, carrier gas flow rate, and absorbent circulation volume, improving system versatility and economy. Finally, it solves the technical problem of consuming large amounts of natural gas or electricity during periods without waste gas generation.

[0039] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An ethylene oxide sterilization waste gas treatment system, characterized in that, Includes the tower body, circulation tank, circulating cooler, and exhaust gas after-treatment device; The tower body has a preset height, and an air inlet is provided on one side of the tower body. A heater is provided on the air inlet, and the circulation tank is connected to the bottom of the tower body. The circulation tank is provided with absorbent liquid. The tower body is provided with a demisting layer, a spray gun and a packing layer from top to bottom. The spray gun is connected to the circulation tank through a circulating liquid pipe and the circulating cooler is installed on the circulating liquid pipe. The top of the tower is connected to the waste gas after-treatment device; The waste gas containing ethylene oxide enters the tower body through the inlet, undergoes mass transfer with the absorbent sprayed by the spray gun, and then enters the waste gas post-treatment device for treatment and discharge. The absorbent absorbs part of the ethylene oxide in the waste gas and falls into the circulation tank. The carrier gas is heated through the inlet and enters the tower body, where it reacts with the absorbent liquid that has absorbed ethylene oxide. After carrying the ethylene oxide, the gas enters the waste gas after-treatment device for treatment and discharge.

2. The ethylene oxide sterilization waste gas treatment system according to claim 1, characterized in that, The area of ​​the top of the circulation tank is larger than the area of ​​the bottom of the tower body, and the tower body is located on one side of the top of the circulation tank.

3. The ethylene oxide sterilization waste gas treatment system according to claim 2, characterized in that, An agitator is also provided, which is located in the middle of the circulation tank. A circulation pump is also installed in the circulation tank, and the circulation pump is connected to the circulation liquid pipe.

4. The ethylene oxide sterilization waste gas treatment system according to claim 3, characterized in that, A water inlet is provided on one side of the circulation tank, which is connected to an external water supply pipe; A drain outlet is provided at the bottom of the circulation tank, which is connected to an external drain outlet.

5. The ethylene oxide sterilization waste gas treatment system according to claim 4, characterized in that, The air inlet of the tower body is located below the packing layer, and the air inlet of the tower body is connected to the main air inlet pipe, which is also connected to the exhaust gas pipe and the carrier gas pipe.

6. The ethylene oxide sterilization waste gas treatment system according to claim 5, characterized in that, The waste gas after-treatment device includes an oxidation furnace and a chimney connected in sequence by pipelines, and the oxidation furnace is connected to the top of the tower by pipelines.

7. A method for treating ethylene oxide sterilization waste gas, characterized in that, The specific steps of using the ethylene oxide sterilization waste gas treatment system according to any one of claims 1-6 include: S1: The waste gas containing ethylene oxide enters the main inlet pipe through the waste gas pipe, and then enters the tower body through the main inlet pipe; S2: The absorbent liquid in the circulation tank is drawn into the circulation pipe by the circulation pump and cooled by the circulation cooler; S3: The cooled absorbent is sprayed into the tower through the spray gun and comes into contact with the ethylene oxide-containing waste gas in the tower to obtain pretreated gas and absorbent containing ethylene oxide. S4: The pretreated gas passes through the demister and enters the exhaust gas after-treatment device for treatment before being discharged. The absorbent containing ethylene oxide enters the circulation tank for the next cycle. S6: When the sterilization chamber of the client stops working and no longer produces high-concentration waste gas, the system automatically switches, and the carrier gas enters the main inlet pipe through the carrier gas pipe and then enters the tower body, where it comes into contact with the absorbent containing ethylene oxide to obtain carrier gas containing ethylene oxide and absorbent liquid freed from ethylene oxide. S7: The carrier gas containing ethylene oxide enters the exhaust gas after treatment device through the demister and is then discharged. The absorbent liquid that has been desorbed from ethylene oxide enters the circulation tank for the next cycle.

8. The method for treating ethylene oxide sterilization waste gas according to claim 7, characterized in that, S1 further includes that when the waste gas containing ethylene oxide enters the main intake pipe through the waste gas pipe, the heater does not heat up; S6 also includes the heater starting to heat the gas when the carrier gas enters the main inlet pipe through the carrier gas pipe and then enters the tower body.

9. The method for treating ethylene oxide sterilization waste gas according to claim 8, characterized in that, In S3, the cooled absorbent is sprayed into the tower through the spray gun, forming a countercurrent contact with the ethylene oxide-containing waste gas in the packing layer.

10. The method for treating ethylene oxide sterilization waste gas according to claim 9, characterized in that, In S7, when the absorbent is insufficient, it is replenished through the water inlet.

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