An ethylene oxide waste gas recovery device and method thereof

Abstract

The present invention discloses an ethylene oxide waste gas recovery device and method, which relates to the field of waste gas treatment and includes a device main body. An primary condensation tank and a secondary condensation tank are provided inside the device main body. By setting the primary condensation tank, secondary condensation tank, condensation pipes, condensation fins and baffles, under the action of the primary condensation tank and the secondary condensation tank, the ethylene oxide waste gas will undergo two cooling treatments, so that a small amount of water and impurities in the ethylene oxide waste gas will be separated. At the same time, under the action of the condensation pipes, condensation fins and baffles, the ethylene oxide waste gas will be fully cooled, so that the ethylene oxide waste gas is processed into liquid ethylene oxide and carbon dioxide, and the liquid ethylene oxide and carbon dioxide can be collected and reused, solving the problem of ethylene oxide recovery, making the use of ethylene oxide more environmentally friendly, saving expenses for enterprises, and reducing carbon emissions at the same time.

Description

Technical Field

[0001] The present invention relates to the field of waste gas treatment, and specifically to an ethylene oxide waste gas recovery device and method thereof. Background Art

[0002] Toxic and harmful gases discharged during the production and living processes are all regarded as waste gases. At present, in order to reduce the pollution of waste gas emissions to the ecological environment, waste gases need to be purified before being discharged, so that the waste gases can meet the emission standards before being discharged.

[0003] Ethylene oxide is widely used in the disinfection process. However, ethylene oxide is a strong carcinogen, and the waste gas after use cannot be directly discharged. It needs to be treated before being allowed to be discharged. Currently, the ethylene oxide after use is fully dissolved in water and then treated with environmental protection equipment, so that the ethylene oxide waste gas can meet the emission standards and be discharged.

[0004] However, the above method of treating ethylene oxide waste gas directly discharges the waste gas after treatment. Enterprises need to continuously use new ethylene oxide, which not only increases the enterprise cost but also causes waste. Therefore, a device that can treat and recover ethylene oxide waste gas is proposed to make it recycled, and at the same time, carbon emissions are reduced. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide an ethylene oxide waste gas recovery device and method thereof to solve the technical problems mentioned in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An ethylene oxide waste gas recovery device includes a device main body. An primary condensation tank and a secondary condensation tank are arranged inside the device main body, and the primary condensation tank and the secondary condensation tank are connected by a pipeline. An air inlet is installed on the outer wall of the primary condensation tank. A refrigerant system corresponding to the primary condensation tank and the secondary condensation tank is arranged inside the device main body. Condensation pipes communicated with the refrigerant system are installed inside both the primary condensation tank and the secondary condensation tank. Condensation fins are installed on the outer wall of the condensation pipes, and baffles are further arranged on the outer wall of the condensation pipes. A liquid collection assembly corresponding to the primary condensation tank and the secondary condensation tank is installed inside the device main body. A gas guide pipe is installed on the side wall of the secondary condensation tank, and the other end of the gas guide pipe is connected to a gaseous recovery system installed inside the device main body.

[0007] By adopting the above technical solution, under the action of the primary condensation tank and the secondary condensation tank, the ethylene oxide waste gas will undergo two cooling treatments, so that a small amount of water and impurities in the ethylene oxide waste gas will be separated. At the same time, under the action of the condensation pipe, the condensation fins and the baffle plate, the ethylene oxide waste gas will be fully cooled, so that the ethylene oxide waste gas is processed into liquid ethylene oxide and carbon dioxide. The liquid ethylene oxide and carbon dioxide can be collected and reused, solving the problem of ethylene oxide recovery, making the use of ethylene oxide more environmentally friendly, saving expenses for enterprises, and reducing carbon emissions at the same time.

[0008] The present invention is further configured such that a transmission pipe is installed at the end of the refrigerant system, and the other end of the transmission pipe respectively enters and exits into the corresponding primary condensation tank and secondary condensation tank and is connected to the condensation pipe.

[0009] By adopting the above technical solution, it is ensured that the condensation pipe can smoothly condense the ethylene oxide waste gas in the primary condensation tank and the secondary condensation tank.

[0010] The present invention is further configured such that the end of the transmission pipe located in the primary condensation tank and the secondary condensation tank is designed in an inverted "T" shape, and the ends of the transmission pipe are installed in the primary condensation tank and the secondary condensation tank in groups of two, and both ends of the condensation pipe are connected to the ends of the transmission pipe.

[0011] By adopting the above technical solution, it is ensured that the cold source in the condensation pipe can circulate back into the refrigerant system through the transmission pipe connected to its other end to form a cycle.

[0012] The present invention is further configured such that multiple groups of condensation fins are installed on the condensation pipe at equal intervals, and multiple groups of baffle plates are installed between the condensation fins, and the multiple groups of baffle plates are staggered.

[0013] By adopting the above technical solution, the ethylene oxide waste gas will undergo multiple condensations by multiple groups of condensation fins, further ensuring the cooling effect on the ethylene oxide waste gas.

[0014] The present invention is further configured such that the baffle plate is designed as a two-thirds circular plate, and the arc-shaped outer wall of the baffle plate fits the inner walls of the corresponding primary condensation tank and secondary condensation tank.

[0015] By adopting the above technical solution, under the action of the shape of the baffle plate, it is ensured that the baffle plate can guide the ethylene oxide waste gas.

[0016] The present invention is further configured such that the liquid collection assembly is composed of an ethylene oxide collector, a discharge valve, a control valve, and a waste liquid tank. The ethylene oxide collector is located at the bottom of the secondary condensation tank, and the waste liquid tank is located at the bottom of the primary condensation tank. Both the ethylene oxide collector and the waste liquid tank are communicated with the corresponding primary condensation tank and secondary condensation tank through control valves, and discharge valves are installed at the ends of the ethylene oxide collector and the waste liquid tank.

[0017] By adopting the above technical solution, it is convenient to treat the impurities and waste water in the primary condensation tank and the liquid ethylene oxide in the secondary condensation tank.

[0018] The present invention is further configured such that the gaseous recovery system is composed of a vacuum tank and a vacuum pump. The vacuum tank is communicated with the vacuum pump and the gas guide pipe, and a carbon dioxide buffer tank is connected to the end of the vacuum pump.

[0019] By adopting the above technical solution, it is ensured that the subsequent vacuum tank will extract the carbon dioxide in the secondary condensation tank through the gas guide pipe.

[0020] The present invention is further configured such that a gas guide hood is installed at the end of the gas guide pipe, and the gas guide hood is installed at a position below the middle of the outer wall of the secondary condensation tank. A retaining ring is installed in the gas guide hood, and a balance valve is installed on the gas guide pipe.

[0021] By adopting the above technical solution, it effectively prevents a large amount of liquid ethylene oxide from entering the gas guide pipe.

[0022] An ethylene oxide waste gas recovery device and method thereof, the process of which includes the following steps:

[0023] S1: First, transfer the ethylene oxide waste gas into the primary condensation tank. The ethylene oxide waste gas will come into contact with the condensation pipe, condensation fins, and baffle plate to separate a small amount of water and impurities in the ethylene oxide waste gas. The water will flow into the waste liquid tank through the control valve.

[0024] S2: Then, after pretreatment, the ethylene oxide waste gas will be transferred to the secondary condensation tank through a pipeline. The condensation pipe, condensation fins, and baffle plate in the secondary condensation tank will cooperate with each other to treat the ethylene oxide waste gas, condense the gaseous ethylene oxide into liquid ethylene oxide, and make the liquid ethylene oxide fall into the ethylene oxide collector through the control valve.

[0025] S3: Start the vacuum pump to pre-vacuum the carbon dioxide buffer tank. When the carbon dioxide buffer tank is in a vacuum state, the carbon dioxide in the secondary condensation tank will enter the carbon dioxide buffer tank, and after being pressurized by the pressurization system, it will be stored in the external carbon dioxide storage tank.

[0026] S4: When the liquid ethylene oxide level in the ethylene oxide collector rises to the sensing electricity of the sensor, the controller will send a signal to close the connection between the ethylene oxide collector and the secondary condensation tank, so that the liquid ethylene oxide in the ethylene oxide collector flows into the external ethylene oxide buffer tank;

[0027] S5: After the liquid ethylene oxide in the ethylene oxide collector is exhausted, the control valve automatically opens, enabling the ethylene oxide collector to be reconnected to the secondary condensation tank for cyclic operation;

[0028] S6: The liquid ethylene oxide in the external ethylene oxide buffer tank will enter the weighing system through the output pump, and finally be remixed with carbon dioxide in proportion through the mixing system and enter the sterilization cabinet for secondary utilization.

[0029] In summary, the present invention mainly has the following beneficial effects:

[0030] By providing a primary condensation tank, a secondary condensation tank, condensation pipes, condensation fins and baffles, under the action of the primary condensation tank and the secondary condensation tank, the ethylene oxide waste gas will undergo two cooling treatments, so that a small amount of water and impurities in the ethylene oxide waste gas will be separated. At the same time, under the action of the condensation pipes, condensation fins and baffles, the ethylene oxide waste gas will be fully cooled, so that the ethylene oxide waste gas is processed into liquid ethylene oxide and carbon dioxide. The liquid ethylene oxide and carbon dioxide can be collected and reused, solving the problem of ethylene oxide recovery, making the use of ethylene oxide more environmentally friendly, saving costs for enterprises, and reducing carbon emissions at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a three-dimensional structure diagram of the present invention;

[0032] Figure 2 is a structure diagram of the interior of the present invention;

[0033] Figure 3 is a structure diagram of the interiors of the primary condensation tank and the secondary condensation tank of the present invention;

[0034] Figure 4 is a structure diagram of the interior of the secondary condensation tank of the present invention;

[0035] Figure 5 is a three-dimensional structure diagram of the condensation pipe of the present invention;

[0036] Figure 6 is a connection structure diagram of the air duct and the vacuum tank of the present invention;

[0037] Figure 7 is a sectional structure diagram of the air duct of the present invention;

[0038] Figure 8 This is the flowchart of the present invention.

[0039] In the figure: 1, device main body; 2, primary condensation tank; 3, secondary condensation tank; 4, air inlet; 5, refrigerant system; 51, transfer pipe; 6, condensation pipe; 7, condensation fin; 8, baffle; 9, filter plate; 10, ethylene oxide collector; 101, discharge valve; 11, control valve; 12, waste liquid tank; 13, gas guide pipe; 131, gas guide hood; 132, retaining ring; 14, vacuum tank; 15, vacuum pump. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described by referring to the accompanying drawings below are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0041] Next, the embodiments of the present invention will be described according to the overall structure of the present invention.

[0042] An ethylene oxide waste gas recovery device, as Figure 1 - Figure 7 shown, includes a device main body 1.

[0043] Specifically, a primary condensation tank 2 and a secondary condensation tank 3 are provided inside the device main body 1, and the primary condensation tank 2 and the secondary condensation tank 3 are connected by a pipeline, so that the ethylene oxide waste gas in the primary condensation tank 2 can smoothly enter the secondary condensation tank 3 for secondary treatment. An air inlet 4 is installed on the outer wall of the primary condensation tank 2, so that the ethylene oxide waste gas can smoothly enter the primary condensation tank 2 through the air inlet 4. A refrigerant system 5 corresponding to the primary condensation tank 2 and the secondary condensation tank 3 is provided inside the device main body 1. Condensation pipes 6 communicated with the refrigerant system 5 are installed in both the primary condensation tank 2 and the secondary condensation tank 3, so that the temperatures in the primary condensation tank 2 and the secondary condensation tank 3 will be controlled by the corresponding condensation pipes 6 between 12 and 15 degrees Celsius and between 2 and 8 degrees Celsius respectively, ensuring that a small amount of water and impurities in the ethylene oxide waste gas entering the primary condensation tank 2 will be separated out, and performing the first treatment on the ethylene oxide waste gas. A transmission pipe 51 is installed at the end of the refrigerant system 5, and the other end of the transmission pipe 51 respectively enters and exits the corresponding primary condensation tank 2 and secondary condensation tank 3 and is connected to the condensation pipe 6, so that after the refrigerant system 5 is started, it will supply energy to the condensation pipes 6 in the primary condensation tank 2 and the secondary condensation tank 3 through the transmission pipe 51, ensuring that the condensation pipes 6 can smoothly condense the ethylene oxide waste gas in the primary condensation tank 2 and the secondary condensation tank 3. A condensation fin 7 is installed on the outer wall of the condensation pipe 6. The condensation fin 7 increases the coverage range of the condensation pipe 6 and improves the control speed of the temperature in the primary condensation tank 2 by the condensation pipe 6. Moreover, a baffle 8 is provided on the outer wall of the condensation pipe 6. The baffle 8 will guide the ethylene oxide waste gas entering the primary condensation tank 2, so that the ethylene oxide waste gas entering the primary condensation tank 2 and the secondary condensation tank 3 will be guided to contact the condensation pipe 6 and the condensation fin 7, thereby increasing the treatment effect of the condensation pipe 6 and the condensation fin 7 on the ethylene oxide waste gas. A liquid collection assembly corresponding to the primary condensation tank 2 and the secondary condensation tank 3 is installed inside the device main body 1. A gas guide pipe 13 is installed on the side wall of the secondary condensation tank 3. Since the temperature in the secondary condensation tank 3 is between 2 and 8 degrees Celsius, when the ethylene oxide waste gas is condensed to 1 to 3 degrees Celsius, liquid ethylene oxide will be generated, separating carbon dioxide. The other end of the gas guide pipe 13 is connected to a gaseous recovery system installed inside the device main body 1. Through the setting of the gaseous recovery system, the carbon dioxide in the secondary condensation tank 3 is evacuated, so that this equipment can recover carbon dioxide and ethylene oxide, solve the problem of ethylene oxide recovery, make the use of ethylene oxide more environmentally friendly, save expenses for enterprises, and at the same time reduce carbon emissions.

[0044] Please refer to Figure 2 - Figure 5, in the above embodiment, the ends of the transfer pipe 51 located inside the primary condensation tank 2 and the secondary condensation tank 3 are designed in an inverted "T" shape, so that the cold source entering the transfer pipe 51 will start to spread. The ends of the transfer pipe 51 are installed in groups of two inside the primary condensation tank 2 and the secondary condensation tank 3 respectively, and both ends of the condensation pipe 6 are connected to the ends of the transfer pipe 51, ensuring that the cold source in the transfer pipe 51 can smoothly enter the condensation pipe 6, and at the same time ensuring that the cold source in the condensation pipe 6 can circulate back to the refrigerant system 5 through the transfer pipe 51 connected to its other end, forming a cycle.

[0045] Please refer to Figure 3 and Figure 4 , in the above embodiment, multiple groups of condensation fins 7 are equidistantly installed on the condensation pipe 6, so that the ethylene oxide waste gas can fully contact the condensation fins 7, ensuring the effect of the condensation fins 7 and the condensation pipe 6 on the ethylene oxide waste gas. Multiple groups of baffles 8 are installed between the condensation fins 7. The baffle 8 is designed as a two-thirds circular plate, and the arc-shaped outer wall of the baffle 8 fits the inner walls of the corresponding primary condensation tank 2 and secondary condensation tank 3, so that the baffle 8 will block the ethylene oxide waste gas. As a result, after the ethylene oxide waste gas enters the primary condensation tank 2 and the secondary condensation tank 3, it will be guided by the baffle 8 to slide towards the condensation fins 7, further improving the condensation effect of the condensation fins 7 on the ethylene oxide waste gas. The multiple groups of baffles 8 are staggered, so that the ethylene oxide waste gas will be blocked by the next baffle 8 when moving downward through the condensation fins 7. In this way, the ethylene oxide waste gas will be condensed multiple times by multiple groups of condensation fins 7, further ensuring the cooling effect on the ethylene oxide waste gas.

[0046] Please refer to Figure 1 and Figure 2 With Figure 6, in the above embodiment, the liquid collection assembly is composed of an ethylene oxide collector 10, a discharge valve 101, a control valve 11, and a waste liquid tank 12. The ethylene oxide collector 10 is located at the bottom of the secondary condensation tank 3, and the waste liquid tank 12 is located at the bottom of the primary condensation tank 2. Both the ethylene oxide collector 10 and the waste liquid tank 12 are connected to the corresponding primary condensation tank 2 and secondary condensation tank 3 through the control valve 11. Thus, the impurities and water separated in the primary condensation tank 2 will flow into the waste liquid tank 12 along the control valve 11. At the same time, the liquid ethylene oxide in the secondary condensation tank 3 will enter the ethylene oxide collector 10 along the control valve 11 to process the liquid ethylene oxide in the secondary condensation tank 3. Meanwhile, a filter plate 9 is installed at the bottom of the secondary condensation tank 3. Through the setting of the filter plate 9, the size of the path for the liquefied ethylene oxide to enter the ethylene oxide collector 10 is effectively reduced, so that a certain amount of liquid ethylene oxide will accumulate on the filter plate 9, effectively reducing the possibility of carbon dioxide entering the ethylene oxide collector 10. Moreover, discharge valves 101 are installed at the ends of both the ethylene oxide collector 10 and the waste liquid tank 12, enabling the ethylene oxide collector 10 and the waste liquid tank 12 to be discharged through the discharge valve 101 after the liquid levels in them reach a certain amount.

[0047] Please refer to Figure 1 and Figure 2 with Figure 6 , in the above embodiment, the gaseous recovery system is composed of a vacuum tank 14 and a vacuum pump 15. The vacuum tank 14 is connected to the vacuum pump 15 and the air duct 13, enabling the vacuum pump 15 to evacuate the vacuum tank 14 to ensure that the subsequent vacuum tank 14 will extract the carbon dioxide in the secondary condensation tank 3 through the air duct 13. Moreover, a carbon dioxide buffer tank is connected to the end of the vacuum pump 15, so that the carbon dioxide in the vacuum tank 14 will be pumped into the carbon dioxide buffer tank by the vacuum pump 15. An air guide hood 131 is installed at the end of the air duct 13. When liquid ethylene oxide enters the air guide hood 131, it will be redirected back to the secondary condensation tank 3 by the air guide hood 131, effectively preventing a large amount of liquid ethylene oxide from entering the air duct 13. The air guide hood 131 is installed at a position in the middle and lower part of the outer wall of the secondary condensation tank 3, so that the ethylene oxide waste gas has been condensed into a liquid state before reaching the position of the air guide hood 131, thereby improving the accuracy of the air duct 13 in extracting carbon dioxide. And a retaining ring 132 is installed in the air guide hood 131, and the retaining ring 132 provides further protection for the air duct 13, so that the liquid ethylene oxide entering the air guide hood 131 will also be blocked by the retaining ring 132, further preventing liquid ethylene oxide from entering the air duct 13. Moreover, a balance valve is installed on the air duct 13. The balance valve will close after the vacuum pressure in the vacuum tank 14 returns to normal pressure, closing the connection between the vacuum tank 14 and the secondary condensation tank 3. At this time, the vacuum pump 15 will automatically evacuate the vacuum tank 14, so that the vacuum tank 14 resumes the vacuum state. At this time, the balance valve will automatically open, enabling the vacuum tank 14 to continue to extract carbon dioxide.

[0048] An ethylene oxide waste gas recovery device and method thereof are as follows Figure 1 - Figure 8 shown, and its process includes the following steps:

[0049] S1: First, transfer the ethylene oxide waste gas to the first-stage condensation tank 2. The ethylene oxide waste gas will come into contact with the condensation pipe 6, the condensation fins 7 and the baffle 8. The condensation fins 7 and the baffle 8 will cooperate with each other to improve the treatment effect of the condensation pipe 6 on the ethylene oxide waste gas, so that a small amount of water and impurities in the ethylene oxide waste gas are separated. At this time, the impurities and water will flow into the waste liquid tank 12 through the control valve 11;

[0050] S2: Then, the pre-treated ethylene oxide waste gas will be transferred to the second-stage condensation tank 3 through a pipeline. The condensation pipe 6, the condensation fins 7 and the baffle 8 in the second-stage condensation tank 3 will cooperate with each other to treat the ethylene oxide waste gas, and condense the gaseous ethylene oxide to 1 - 3 °C, that is, generate liquid ethylene oxide, so that the liquid ethylene oxide falls to the bottom of the second-stage condensation tank 3. At this time, the liquid ethylene oxide can be transferred to the ethylene oxide collector 10 by opening the control valve 11;

[0051] S3: Start the vacuum pump 15 to pre-evacuate the carbon dioxide buffer tank. When the carbon dioxide buffer tank is in a vacuum state, the balance valve opens, so that the carbon dioxide in the second-stage condensation tank 3 will enter the carbon dioxide buffer tank, and after being pressurized by the pressurization system, it is stored in the external carbon dioxide gas storage tank. When the vacuum pressure in the carbon dioxide buffer tank returns to normal pressure, the balance valve will automatically close. At this time, the vacuum pump 15 will be automatically started again to pump the carbon dioxide in the carbon dioxide buffer tank to the external carbon dioxide collection tank;

[0052] S4: As the liquid level of the liquid ethylene oxide in the ethylene oxide collector 10 gradually increases, when the liquid level of the liquid ethylene oxide rises to the sensor induction electricity, the controller will send a signal to close the control valve 11, close the connection between the ethylene oxide collector 10 and the second-stage condensation tank 3, and at the same time open the discharge valve 101, so that the liquid ethylene oxide in the ethylene oxide collector 10 flows to the external ethylene oxide buffer tank;

[0053] S5: After the liquid ethylene oxide in the ethylene oxide collector 10 is drained, the control valve 11 automatically opens, so that the ethylene oxide collector 10 is reconnected to the second-stage condensation tank 3 for cyclic operation;

[0054] S6: The liquid ethylene oxide in the external ethylene oxide buffer tank will enter the weighing system through the output pump, and finally be mixed with carbon dioxide again in proportion through the mixing system and enter the sterilization cabinet for secondary utilization.

[0055] Although embodiments of the present invention have been shown and described, the specific embodiments are merely explanations of the present invention and not limitations thereof. The specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations that do not make a creative contribution to the embodiments as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An ethylene oxide waste gas recovery device, comprising a device main body (1), characterized in that: Inside the device main body (1), there is a primary condensation tank (2) and a secondary condensation tank (3), and the primary condensation tank (2) and the secondary condensation tank (3) are connected by a pipeline. An air inlet (4) is installed on the outer wall of the primary condensation tank (2). Inside the device main body (1), there is a refrigerant system (5) corresponding to the primary condensation tank (2) and the secondary condensation tank (3). Condensation pipes (6) communicating with the refrigerant system (5) are installed in both the primary condensation tank (2) and the secondary condensation tank (3). Condensation fins (7) are installed on the outer wall of the condensation pipes (6), and a baffle (8) is also provided on the outer wall of the condensation pipes (6). A liquid collection assembly corresponding to the primary condensation tank (2) and the secondary condensation tank (3) is installed inside the device main body (1). An air guide pipe (13) is installed on the side wall of the secondary condensation tank (3), and the other end of the air guide pipe (13) is connected to a gaseous recovery system installed inside the device main body (1). The temperatures in the primary condensation tank (2) and the secondary condensation tank (3) are respectively controlled between 12 and 15 degrees Celsius and 2 and 8 degrees Celsius by the corresponding condensation pipes (6). A transmission pipe (51) is installed at the end of the refrigerant system (5), and the other end of the transmission pipe (51) extends into the corresponding primary condensation tank (2) and secondary condensation tank (3) respectively and is connected to the condensation pipe (6). The ends of the transmission pipe (51) located inside the primary condensation tank (2) and the secondary condensation tank (3) are designed in an inverted "T" shape, and the ends of the transmission pipe (51) are installed in the primary condensation tank (2) and the secondary condensation tank (3) in groups of two. Both ends of the condensation pipe (6) are connected to the ends of the transmission pipe (51). Multiple groups of the condensation fins (7) are installed on the condensation pipe (6) at equal intervals, and multiple groups of the baffles (8) are installed between the condensation fins (7), and the multiple groups of baffles (8) are staggeredly distributed. The baffle (8) is designed as a two-thirds circular plate, and the arc-shaped outer wall of the baffle (8) fits the inner walls of the corresponding primary condensation tank (2) and secondary condensation tank (3). The liquid collection assembly consists of an ethylene oxide collector (10), a discharge valve (101), a control valve (11), and a waste liquid tank (12). The ethylene oxide collector (10) is located at the bottom of the secondary condensation tank (3), the waste liquid tank (12) is located at the bottom of the primary condensation tank (2), and both the ethylene oxide collector (10) and the waste liquid tank (12) are communicated with the corresponding primary condensation tank (2) and secondary condensation tank (3) through the control valve (11). Discharge valves (101) are installed at the ends of both the ethylene oxide collector (10) and the waste liquid tank (12). The gaseous recovery system consists of a vacuum tank (14) and a vacuum pump (15). The vacuum tank (14) is communicated with the vacuum pump (15) and the air guide pipe (13), and the end of the vacuum pump (15) is connected to a carbon dioxide buffer tank. A gas guide cover (131) is installed at the end of the air guide pipe (13), and the gas guide cover (131) is installed at a position in the middle and lower part of the outer wall of the secondary condensation tank (3). A retaining ring (132) is installed inside the gas guide cover (131), and a balance valve is installed on the air guide pipe (13).

2. A method for using an ethylene oxide waste gas recovery device, characterized in that: Using an ethylene oxide waste gas recovery device described in claim 1, the process comprises the following steps: S1: First, transfer the ethylene oxide waste gas into the primary condensation tank (2). The ethylene oxide waste gas will come into contact with the condensation pipe (6), condensation fins (7) and baffle (8) to separate a small amount of water and impurities in the ethylene oxide waste gas. The water will flow into the waste liquid tank (12) through the control valve (11); S2: Then, the pretreated ethylene oxide waste gas will be transferred through a pipeline to the secondary condensation tank (3). The condensation pipe (6), condensation fins (7) and baffle (8) in the secondary condensation tank (3) will cooperate to process the ethylene oxide waste gas, condensing the gaseous ethylene oxide into liquid ethylene oxide, so that the liquid ethylene oxide enters the ethylene oxide collector (10) through the control valve (11); S3: Start the vacuum pump (15) to pre-vacuum the carbon dioxide buffer tank. When the carbon dioxide buffer tank is in a vacuum state, the carbon dioxide in the secondary condensation tank (3) will enter the carbon dioxide buffer tank and be stored in the external carbon dioxide gas storage tank after being pressurized by the pressurization system; S4: When the liquid level of the liquid ethylene oxide in the ethylene oxide collector (10) rises to the sensor induction point, the controller will send a signal, and the connection between the ethylene oxide collector (10) and the secondary condensation tank (3) will be closed, so that the liquid ethylene oxide in the ethylene oxide collector (10) flows into the external ethylene oxide buffer tank; S5: After the liquid ethylene oxide in the ethylene oxide collector (10) is emptied, the control valve (11) will automatically open, so that the ethylene oxide collector (10) is reconnected to the secondary condensation tank (3) for cyclic operation; S6: The liquid ethylene oxide in the external ethylene oxide buffer tank will enter the weighing system through the output pump and finally be mixed with carbon dioxide again in proportion through the mixing system and enter the sterilization cabinet for secondary utilization.

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