A system for treating ethylene oxide tail gas

Abstract

The utility model discloses an ethylene oxide tail gas treatment system, comprising an exhaust main pipe arranged along a long path, one end of the exhaust main pipe is provided with an intake flange connected to a tail gas port, a concentration sensor and a flow sensor are respectively arranged on the exhaust main pipe and adjacent to a gas mixing device, a tail gas dilution device and a tail gas enrichment device are respectively arranged on both sides of the exhaust main pipe and adjacent to the gas mixing device inlet end, a certain unit amount of inert gas is injected into the exhaust main pipe through the tail gas dilution device, so that the tail gas and the inert gas with originally high concentration enter into the gas mixing device at the same time, and are quickly mixed under the rotation of a stirring blade, so as to achieve a standard concentration of ethylene oxide tail gas, and then the tail gas enters a catalyst chamber through an exhaust sub-pipe for combustion catalytic decomposition, effectively preventing combustion explosion caused by excessively high concentration of ethylene oxide tail gas and adverse effects on catalyst chamber equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment, in particular to an ethylene oxide tail gas treatment system. Background Art

[0002] The tail gas generated during the ethylene oxide sterilization process mainly includes unreacted ethylene oxide, denatured ethylene oxide, oxyketones, etc. These substances have different toxicity and corrosiveness, which are harmful to human body and environment. Therefore, the goal of tail gas treatment process is to effectively remove these harmful substances or convert them into harmless substances to protect the safety of personnel and environment.

[0003] Existing tail gas treatment devices for ethylene oxide sterilizers generally adopt a method of simply diluting the ethylene oxide tail gas once before entering the high-temperature catalyst chamber for combustion and catalytic decomposition. It has been found through testing that in most cases, the treatment of ethylene oxide tail gas can meet the emission standards; however, there are also some special cases, such as the concentration of ethylene oxide in the tail gas discharged by the ethylene oxide sterilizer is not always stable. If the concentration is too high and it is ignited after only one quantitative dilution, there is a possibility of catalytic explosion. Although this explosion will not cause fundamental harm to the catalyst chamber, it will reduce the service life and use effect of the catalyst chamber equipment in the long run; on the other hand, ethylene oxide that has only been diluted once cannot guarantee that it can be fully burned and catalytically decomposed, because when the ethylene oxide concentration is low, its ratio concentration with the catalytic gas cannot reach the optimal ignition point, so the discharged gas still contains a certain amount of ethylene oxide, which brings continuous adverse effects to the environment. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] Therefore, the purpose of the present invention is to provide an ethylene oxide tail gas treatment system to solve the problems of unstable catalytic effect and insufficient catalysis in the tail gas treatment system of the existing ethylene oxide sterilizer proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an ethylene oxide tail gas treatment system, comprising an exhaust main pipe arranged along a long path, one end of the exhaust main pipe having an inlet flange connected to the tail gas port, the end of the exhaust main pipe away from the inlet flange being connected to a gas mixing device, a concentration sensor 1 and a flow sensor being respectively arranged on the exhaust main pipe and adjacent to the gas mixing device, an exhaust dilution device and an exhaust enrichment device being respectively arranged on both sides of the exhaust main pipe and adjacent to the inlet end of the gas mixing device, an exhaust sub-pipe being connected to the gas outlet end of the gas mixing device, and the end of the exhaust sub-pipe away from the gas mixing device being connected to a catalyst chamber;

[0007] Among them, the ethylene oxide tail gas treatment system is also equipped with a master control processing center.

[0008] As a preferred solution of the ethylene oxide tail gas treatment system described in the utility model, a regulating fan and a concentration sensor 2 are respectively arranged on the exhaust main pipe and adjacent to the air inlet flange.

[0009] As a preferred solution of an ethylene oxide tail gas treatment system described in the utility model, an air collecting chamber is provided on the exhaust main pipe and is located in the direction of the air inlet end of the regulating fan. The air collecting chamber is also provided with at least one expansion valve, and the air inlet end of the tail gas enrichment device is connected to the air collecting chamber.

[0010] As a preferred solution of an ethylene oxide tail gas treatment system described in the utility model, the tail gas dilution device includes an air duct one whose one end is connected to the exhaust main pipe, an inert gas source arranged at the other end of the air duct one, an adjustable air pump arranged on the air duct one and located in the direction of the inert gas source output end, and an electromagnetic flow valve one arranged on the air duct one and adjacent to the exhaust main pipe.

[0011] As a preferred solution of an ethylene oxide tail gas treatment system described in the utility model, the tail gas enrichment device includes an air duct two, one end of which is connected to the exhaust main pipe and the other end is connected to the air collecting chamber, and a compressor, a fan and an electromagnetic flow valve two arranged in sequence on the air duct two and adjacent to the exhaust main pipe.

[0012] As a preferred solution of the ethylene oxide tail gas treatment system described in the utility model, the exhaust end of the catalyst chamber is connected to an exhaust pipe, and the other end of the exhaust pipe is connected to a filtering device.

[0013] Compared with the prior art, the beneficial effect of the utility model is that the ethylene oxide tail gas treatment system, with the cooperation of the exhaust main pipe, concentration sensor, flow sensor, gas collecting chamber, tail gas dilution device and tail gas enrichment device, gas mixing device, etc., can effectively achieve the purpose of rapid adjustment of the ethylene oxide tail gas concentration, effectively avoid the problem of incomplete combustion caused by low ethylene oxide concentration and unbalanced coordination, which in turn leads to emission pollution, and prevent the combustion and explosion caused by excessively high ethylene oxide tail gas concentration and the adverse effects on the catalyst chamber equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall process structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the process flow of the tail gas dilution device and the tail gas enrichment device of the utility model.

[0016] In the figure: 100, exhaust main pipe; 110, air intake flange; 120, concentration sensor 1; 130, flow sensor; 140, regulating fan; 150, concentration sensor 2; 160, air collecting chamber; 170, expansion valve; 200, tail gas dilution device; 210, air guide pipe 1; 220, inert gas source; 230, adjustable air pump; 240, electromagnetic flow valve 1; 300, tail gas enrichment device; 310, air guide pipe 2; 320, compressor; 330, fan; 340, electromagnetic flow valve 2; 400, gas mixing device; 410, exhaust auxiliary pipe; 500, catalyst chamber; 600, discharge pipe; 610, filtering device. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0018] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0019] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Figure 1-Figure 2 The schematic diagram of the whole structure of the ethylene oxide tail gas treatment system of the utility model is shown in FIG. Figure 1-Figure 2In the present embodiment, an ethylene oxide tail gas treatment system comprises an exhaust pipe 100 arranged along a long path, one end of the exhaust pipe 100 is provided with an inlet flange 110 connected to the tail gas port, the end of the exhaust pipe 100 away from the inlet flange 110 is connected to a gas mixing device 400, a concentration sensor 120 and a flow sensor 130 are respectively arranged on the exhaust pipe 100 and adjacent to the gas mixing device 400, an exhaust dilution device 200 and an exhaust enrichment device 300 are respectively arranged on both sides of the exhaust pipe 100 and adjacent to the inlet end of the gas mixing device 400, an exhaust sub-pipe 410 is connected to the gas outlet end of the gas mixing device 400, and the end of the exhaust sub-pipe 410 away from the gas mixing device 400 is connected to the catalyst chamber 500; wherein, the ethylene oxide tail gas treatment system is also provided with a master control processing center.

[0021] A regulating fan 140 and a second concentration sensor 150 are respectively provided on the exhaust main pipe 100 and near the air intake flange 110. In the present embodiment, the regulating fan 140 can control and fine-tune the output flow rate of the exhaust gas from the exhaust main pipe 100 in cooperation with the flow sensor 130 and the controller. The first concentration sensor 120 can detect the concentration of the exhaust gas at the rear section of the exhaust main pipe 100 so that the control unit can determine whether to dilute or increase the concentration of ethylene oxide according to the concentration difference, which is beneficial to the subsequent catalytic treatment. The second concentration sensor 150 can detect the concentration of the exhaust gas at the front section of the exhaust main pipe 100 so that the control unit can make advance preparations according to the concentration difference and the flow stroke, which is beneficial to more accurately control the output of the exhaust dilution device 200 and the exhaust enrichment device 300.

[0022] An air collecting chamber 160 is provided on the exhaust main pipe 100 and is located in the direction of the air inlet end of the regulating fan 140. The air collecting chamber 160 is also provided with at least one expansion valve 170, and the air inlet end of the exhaust gas enrichment device 300 is connected to the air collecting chamber 160. Since the exhaust gas enrichment device 300 requires ethylene oxide exhaust gas as a medium basis, the excess exhaust gas output by the sterilizer will be collected by the air collecting chamber 160. When necessary, the exhaust gas enrichment device 300 can extract and adjust the ethylene oxide exhaust gas in the air collecting chamber 160 at any time. It is simple and reasonably designed.

[0023] In this embodiment, the exhaust gas dilution device 200 includes an air duct 210 having one end connected to the exhaust main pipe 100, an inert gas source 220 disposed at the other end of the air duct 210, an adjustable air pump 230 disposed on the air duct 210 and located in the direction of the output end of the inert gas source 220, and an electromagnetic flow valve 240 disposed on the air duct 210 and adjacent to the exhaust main pipe 100. When the detection unit detects that the concentration of ethylene oxide tail gas is too high, before the tail gas is about to enter the gas mixing device 400, the valve of the inert gas source 220 is opened in time, and a certain unit amount of inert gas is injected into the exhaust main pipe 100 with the cooperation of the adjustable air pump 230, the electromagnetic flow valve 240, the air guide pipe 210 and the control unit, so that the tail gas with a high concentration and the inert gas enter the gas mixing device 400 at the same time, and are quickly mixed under the rotation of the stirring blade, so as to achieve the standard concentration of ethylene oxide tail gas, and then the tail gas enters the catalyst chamber 500 through the exhaust sub-pipe 410 for combustion catalytic decomposition, which effectively prevents the combustion and explosion caused by the excessively high concentration of ethylene oxide tail gas and the adverse effects on the catalyst chamber equipment.

[0024] It should be noted that the gas mixing device 400 in this embodiment may be a pipeline mixing pump, or other devices that can quickly mix the incoming gas.

[0025] In this embodiment, the exhaust gas enrichment device 300 includes an air guide pipe 310 connected to the exhaust main pipe 100 at one end and connected to the air collecting chamber 160 at the other end, and a compressor 320, a fan 330 and an electromagnetic flow valve 340 arranged in sequence on the air guide pipe 310. When the detection unit detects that the concentration of ethylene oxide exhaust gas is low, before the exhaust gas is about to enter the gas mixing device 400, the compressor 320 has compressed the collected exhaust gas to a high concentration of ethylene oxide gas in advance, and then the fan 330, the electromagnetic flow valve 340 and the exhaust gas mixing device 400 are connected to the exhaust main pipe 100. With the cooperation of flow valve 2 340, air guide pipe 2 310 and control unit, a certain unit amount of ethylene oxide gas is injected into the exhaust main pipe 100, so that the exhaust gas with originally low concentration and the exhaust gas with high concentration enter the gas mixing device 400 at the same time, and are quickly mixed under the rotation of the stirring blade, so as to achieve the standard concentration of ethylene oxide exhaust gas. Then, the exhaust gas enters the catalyst chamber 500 through the exhaust auxiliary pipe 410 for combustion catalytic decomposition, avoiding the problem of incomplete combustion caused by low ethylene oxide concentration and unbalanced coordination, which in turn leads to emission pollution.

[0026] Furthermore, the exhaust end of the catalyst chamber 500 is connected to an exhaust pipe 600, and the other end of the exhaust pipe 600 is connected to a filter device 610. Here, the filter device 610 can be a filter element such as activated carbon, which can perform terminal purification of waste gas particles such as carbon dioxide in the gas discharged from the catalyst chamber 500, thereby further improving the effect of exhaust gas treatment.

[0027] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An ethylene oxide tail gas treatment system, characterized in that: The invention comprises an exhaust main pipe (100) arranged along a long path, wherein one end of the exhaust main pipe (100) is provided with an intake flange (110) connected to an exhaust port, and one end of the exhaust main pipe (100) away from the intake flange (110) is connected to a gas mixing device (400), and a concentration sensor (120) and a flow sensor (130) are respectively arranged on the exhaust main pipe (100) and adjacent to the gas mixing device (400), and an exhaust gas dilution device (200) and an exhaust gas enrichment device (300) are respectively arranged on both sides of the exhaust main pipe (100) and adjacent to the intake end of the gas mixing device (400), and an exhaust sub-pipe (410) is connected to the gas outlet end of the gas mixing device (400), and one end of the exhaust sub-pipe (410) away from the gas mixing device (400) is connected to a catalyst chamber (500); Among them, the ethylene oxide tail gas treatment system is also equipped with a master control processing center.

2. The ethylene oxide tail gas treatment system according to claim 1, characterized in that: A regulating fan (140) and a second concentration sensor (150) are also provided on the exhaust main pipe (100) and adjacent to the air inlet flange (110).

3. The ethylene oxide tail gas treatment system according to claim 1, characterized in that: A gas collecting chamber (160) is provided on the exhaust main pipe (100) and is located in the direction of the air inlet end of the regulating fan (140). The gas collecting chamber (160) is also provided with at least one expansion valve (170), and the air inlet end of the exhaust gas enrichment device (300) is connected to the gas collecting chamber (160).

4. The ethylene oxide tail gas treatment system according to claim 1, characterized in that: The exhaust gas dilution device (200) comprises an air guide pipe (210) having one end connected to the exhaust main pipe (100), an inert gas source (220) arranged at the other end of the air guide pipe (210), an adjustable air pump (230) arranged on the air guide pipe (210) and located in the direction of the output end of the inert gas source (220), and an electromagnetic flow valve (240) arranged on the air guide pipe (210) and adjacent to the exhaust main pipe (100).

5. The ethylene oxide tail gas treatment system according to claim 1, characterized in that: The exhaust gas enrichment device (300) comprises a second air guide pipe (310) having one end connected to the exhaust main pipe (100) and the other end connected to the air collecting chamber (160), and a compressor (320), a fan (330) and a second electromagnetic flow valve (340) arranged in sequence on the second air guide pipe (310) and adjacent to the exhaust main pipe (100).

6. The ethylene oxide tail gas treatment system according to claim 1, characterized in that: The exhaust end of the catalyst chamber (500) is connected to an exhaust pipe (600), and the other end of the exhaust pipe (600) is connected to a filtering device (610).

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