Waste gas treatment system for EVA device

Abstract

The utility model discloses an EVA device waste gas treatment system which comprises an EVA device waste gas outlet end, a first valve is arranged at the EVA device waste gas outlet end, the gas outlet end of the first valve is connected with two sets of RTO waste gas treatment systems in parallel, the gas inlet ends of the two sets of RTO waste gas treatment systems are communicated through a first pipeline, and the first pipeline is provided with a second valve; a third valve is arranged at the gas inlet end of the RTO waste gas treatment system, the gas outlet end of the third valve is communicated with the gas inlet end of the RTO waste gas treatment device through a waste gas fan, and the gas outlet end of the RTO waste gas treatment device is communicated with a chimney through a second pipeline; the air inlet end of the third valve is further communicated with a chimney through an emergency discharge pipeline. According to the scheme, the waste gas treatment efficiency is high, and device shutdown caused by faults of a waste gas treatment system can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to EVA production field, and specifically relates to a kind of EVA device waste gas treatment system. BACKGROUND

[0002] EVA device produces a large amount of organic waste gas in production operation process, and the waste gas needs to be harmlessly treated, so that it meets the environmental protection requirements of GB31572-2015. In the prior art, the waste gas treatment system of EVA device is mostly a set of RTO waste gas treatment system, which is easy to cause environmental pollution when the waste gas emission is large or the equipment fails. For example, when the EVA device produces high MI and high VA content products, the waste gas outlet concentration reaches more than 55 mg / m3. Once the RTO waste gas treatment system fails or stops burning for more than 20 minutes, it will cause the daily average emission to exceed the standard. According to the environmental protection requirements, the waste gas collection and treatment system should be operated synchronously with the production process equipment. When a fault occurs or is repaired, the corresponding production process equipment should be stopped running, and after the repair is completed, it should be put into use synchronously. However, the EVA device is a high-temperature and high-pressure polymerization reaction. If the device stops, a large amount of pressure needs to be released to the flare. After stopping, 20 tons of ethylene will be vented, causing a large amount of energy consumption and material consumption. SUMMARY

[0003] In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide an EVA device waste gas treatment system with high waste gas treatment efficiency and effectively avoiding device shutdown.

[0004] To solve the above problems, the utility model provides the following technical scheme:

[0005] An EVA device waste gas treatment system includes an EVA device waste gas outlet end, a valve one is provided at the EVA device waste gas outlet end, and two sets of RTO waste gas treatment systems are connected in parallel at the outlet end of the valve one. The inlet ends of the two sets of RTO waste gas treatment systems are connected through a pipeline one, and the pipeline one is provided with a valve two. A valve three is provided at the inlet end of the RTO waste gas treatment system, the outlet end of the valve three is connected to the inlet end of the RTO waste gas processor through a waste gas fan, and the outlet end of the RTO waste gas processor is connected to a chimney through a pipeline two. The inlet end of the valve three is also connected to the chimney through an emergency discharge pipeline, and the emergency discharge pipeline is provided with a valve four.

[0006] It should be noted that the two sets of RTO waste gas treatment systems in the application are completely the same in structure, are parallel to each other, and when one of the sets of equipment fails, the switching of different RTO waste gas treatment systems can be realized through the adjustment of valve one and valve two, thereby avoiding the shutdown of the EVA device due to the failure of the waste gas treatment system. At the same time, when the amount of waste gas is large, the two sets of RTO waste gas treatment systems can be opened at the same time, thereby improving the waste gas treatment efficiency, avoiding the emission of harmful gas into the atmosphere due to the failure of timely treatment, realizing more reliable treatment efficiency and lower system pressure loss, reducing the outlet emission of organic waste gas, and realizing the deep treatment of EVA device waste gas.

[0007] In order to further exert the waste gas treatment capacity of the EVA device waste gas treatment system in the application, the technical scheme of the utility model further comprises that the pipeline one is communicated with a PP device waste gas outlet end, and the EVA device waste gas outlet end and the PP device waste gas outlet end are respectively located at two ends of the pipeline one. On the basis of effectively treating the EVA device waste gas, the waste gas discharged from the PP blending material bin and the buffer hopper of the one reverse / two reverse extruding machine in the PP device can also be effectively treated, so as to achieve the purpose of deep treatment of the PP waste gas.

[0008] The technical scheme of the utility model further comprises that the inlet end of the valve three is provided with an LEL sensor, and the inlet end of the waste gas fan is provided with a pressure sensor. The LEL sensor is used for detecting the lowest concentration of combustible gas forming a combustible mixture in air, i.e. the lower explosive limit (Lower Explosive Limit). This key safety parameter can be used to evaluate the explosion risk of the combustible gas in the waste gas pipeline. The pressure sensor is used for monitoring and measuring the pressure value in the pipeline.

[0009] The technical scheme of the utility model further comprises that the inner cavity of the RTO waste gas processor is sequentially provided with a heat storage bed layer and a combustion chamber from bottom to top, and the combustion chamber is provided with a gas inlet and a temperature sensor. The temperature sensor can detect the average temperature in the combustion chamber. The average temperature is an important parameter in the running process of the combustion chamber and the system.

[0010] The technical scheme of the utility model further comprises that the combustion chamber is provided with a hot bypass air door, the hot bypass air door is communicated with a chimney through a hot bypass pipeline, and the hot bypass pipeline is provided with a valve five. Through the monitoring of the temperature sensor, if the temperature of the combustion chamber is too low, the furnace head is ignited; if the temperature of the combustion chamber is too high, the hot bypass air door needs to be opened to avoid the influence of the too high temperature on the supporting strength of the RTO waste gas processor.

[0011] The utility model discloses a technical scheme still includes, the bottom of RTO waste gas treater is equipped with the purging air inlet, and the purging air inlet is connected with purging fan.

[0012] The utility model discloses a technical scheme still includes, the pipeline no. 2 is equipped with heat exchanger, and the heat exchange pipeline of heat exchanger is connected with the air inlet end of waste gas fan.

[0013] The utility model discloses a technical scheme still includes, the EVA device waste gas air outlet and valve no. 1 between being equipped with cloth bag dust collector.

[0014] The utility model discloses a beneficial effect is: compared with prior art, the utility model discloses a kind of EVA device waste gas processing system, which has high waste gas treatment efficiency and can effectively avoid device parking caused by waste gas treatment system failure, in the present application, two sets of RTO waste gas treatment systems are arranged in parallel at the EVA device waste gas air outlet, reducing the operating pressure of the original RTO waste gas treatment system of EVA device, prolonging the service life of equipment, the two sets of RTO waste gas treatment systems are connected in parallel, and each other is hot spare, can realize on-line switching, if one of the equipment fails, different RTO waste gas treatment systems can be switched by adjusting valve no. 1 and valve no. 2, thereby avoiding device parking caused by waste gas treatment system failure, and when the waste gas amount is large, two sets of RTO waste gas treatment systems can be opened simultaneously, thereby improving waste gas treatment efficiency, and avoiding harmful gases from being discharged into the atmosphere due to not being treated in time. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows, and obviously, other drawings can be obtained by those skilled in the art without creative labor on the premise of not paying the creative labor.

[0016] Figure 1 It is the schematic diagram of EVA device waste gas processing system in specific implementation mode.

[0017] Wherein, 1 is the valve one, 2 is the bag dust collector, 3 is the pipeline one, 4 is the valve two, 5 is the valve three, 6 is the waste gas fan, 7 is the RTO waste gas processor, 8 is the LEL sensor, 9 is the pressure sensor, 10 is the regenerative bed, 11 is the combustion chamber, 12 is the gas inlet, 13 is the temperature sensor, 14 is the hot bypass damper, 15 is the hot bypass pipeline, 16 is the chimney, 17 is the valve five, 18 is the purge fan, 19 is the purge air inlet, 20 is the pipeline two, 21 is the heat exchanger, 22 is the emergency exhaust pipeline, 23 is the valve four. DETAILED DESCRIPTION

[0018] In order to make the personnel in the technical field better understand the technical scheme in the utility model, the technical scheme in the embodiment of the utility model will be described clearly and completely below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor should belong to the protection scope of the utility model.

[0019] In the description of the utility model, it is understood that the terms "center", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of describing the description of the utility model for simplification, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the utility model.

[0020] As can be seen from the drawings, an EVA device waste gas treatment system, comprising an EVA device waste gas outlet end, the EVA device waste gas outlet end is provided with a valve one 1, the EVA device waste gas outlet end and the valve one 1 are provided with a bag dust collector 2, the outlet end of the valve one 1 is connected in parallel with two sets of RTO waste gas treatment systems, the inlet ends of the two sets of RTO waste gas treatment systems are communicated through a pipeline one 3, the pipeline one 3 is provided with a valve two 4; the pipeline one 3 is also communicated with a PP device waste gas outlet end, the EVA device waste gas outlet end and the PP device waste gas outlet end are respectively located at both ends of the pipeline one 3.

[0021] The air inlet end of the RTO waste gas treatment system is provided with a valve three 5, the air outlet end of the valve three 5 is communicated with the air inlet end of the RTO waste gas processor 7 through a waste gas fan 6, the air inlet end of the valve three 5 is provided with an LEL sensor 8, the air inlet end of the waste gas fan is provided with a pressure sensor 9, the inner cavity of the RTO waste gas processor 7 is sequentially provided with a heat storage bed layer 10 and a combustion chamber 11 from bottom to top, the side wall of the combustion chamber 11 is provided with a gas inlet 12 and a temperature sensor 13; the combustion chamber 11 is provided with a hot bypass damper 14, the hot bypass damper 14 is communicated with a chimney 16 through a hot bypass pipeline 15, the hot bypass pipeline 15 is provided with a valve five 17; the bottom of the RTO waste gas processor 7 is provided with a purge air inlet 19, the purge air inlet 19 is communicated with a purge fan 18.

[0022] The air outlet end of the RTO waste gas processor 7 is communicated with the chimney 16 through a pipeline two 20; the pipeline two 20 is provided with a heat exchanger 21, the heat exchange pipeline of the heat exchanger 21 is connected with the air inlet end of the waste gas fan 6. The air inlet end of the valve three 5 is also communicated with the chimney 16 through an emergency discharge pipeline 22, the emergency discharge pipeline 22 is provided with a valve four 23.

[0023] The two sets of RTO waste gas treatment systems in the embodiment are completely the same in structure, are parallel to each other, have high waste gas treatment efficiency and can effectively avoid the EVA device waste gas treatment system from stopping, if one of the sets of equipment fails, the switching of different RTO waste gas treatment systems can be realized through the adjustment of the valve one and the valve two, thus the stopping of the EVA device caused by the failure of the waste gas treatment system is avoided, meanwhile, when the waste gas amount is large, the two sets of RTO waste gas treatment systems can be started at the same time, thus the waste gas treatment efficiency is improved, the harmful gas is avoided from being discharged into the atmosphere due to not being treated in time, more reliable treatment efficiency and lower system pressure loss are realized, the outlet discharged organic waste gas is reduced, and the deep treatment of the EVA device waste gas is realized.

[0024] The EVA device waste gas outlet end and the PP device waste gas outlet end are respectively located at two ends of the pipeline one. On the basis of effectively treating the EVA device waste gas, the waste gas discharged from the PP mixed material bin and the buffer hopper of the one reverse / two reverse extruding machine in the PP device can also be effectively treated, and the purpose of deep treatment of the PP waste gas is achieved.

[0025] Although the utility model has been described in detail with reference to the drawings and in connection with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, those skilled in the art can make various equivalent modifications or replacements to the embodiments of the utility model, and these modifications or replacements should be within the scope of the utility model, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, and these changes or replacements should be within the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. An EVA device exhaust gas treatment system, characterized in that: The system includes an EVA device exhaust gas outlet, which is equipped with valve one. Two RTO exhaust gas treatment systems are connected in parallel to the outlet of valve one. The inlets of the two RTO exhaust gas treatment systems are connected via pipeline one, which is equipped with valve two. The inlet of each RTO exhaust gas treatment system is equipped with valve three. The outlet of valve three is connected to the inlet of the RTO exhaust gas processor via an exhaust gas fan. The outlet of the RTO exhaust gas processor is connected to the chimney via pipeline two. The inlet of valve three is also connected to the chimney via an emergency discharge pipeline, which is equipped with valve four.

2. The EVA device exhaust gas treatment system according to claim 1, characterized in that: The pipeline is connected to the exhaust gas outlet of the PP device, and the exhaust gas outlets of the EVA device and the PP device are located at opposite ends of the pipeline.

3. The EVA device exhaust gas treatment system according to claim 1, characterized in that: The valve three is equipped with an LEL sensor at its air inlet end, and the exhaust fan is equipped with a pressure sensor at its air inlet end.

4. The EVA device exhaust gas treatment system according to claim 1, characterized in that: The RTO exhaust gas processor has a heat storage bed and a combustion chamber arranged from bottom to top in its inner cavity. The combustion chamber is equipped with a gas inlet and a temperature sensor.

5. The EVA device exhaust gas treatment system according to claim 4, characterized in that: The combustion chamber is equipped with a heat bypass ventilation door, which is connected to the chimney through a heat bypass pipeline. The heat bypass pipeline is equipped with valve five.

6. The EVA device exhaust gas treatment system according to claim 1, characterized in that: The bottom of the RTO exhaust gas processor is equipped with a purge air inlet, which is connected to a purge fan.

7. The EVA device exhaust gas treatment system according to claim 1, characterized in that: The second pipeline is equipped with a heat exchanger, and the heat exchanger's heat exchange pipeline is connected to the air inlet end of the exhaust gas fan.

8. The EVA device exhaust gas treatment system according to claim 1, characterized in that: A bag filter is installed between the exhaust gas outlet of the EVA device and valve one.

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