A system for preparing olefins

Abstract

An olefin preparation system relates to the technical field of olefin preparation, comprising an unqualified ethylene recycling pipeline, a suction tank and a reaction gas compressor connected in sequence, wherein a defoaming net is arranged in the suction tank; the olefin preparation system also comprises a first flushing pipeline and a second flushing pipeline, wherein the first flushing pipeline is connected to the unqualified ethylene recycling pipeline, and the second flushing pipeline is connected to the suction tank, wherein the first flushing pipeline is used to pass a flushing agent into the unqualified ethylene recycling pipeline, and the second flushing pipeline is used to pass a flushing agent into the suction tank, so that the flushing agent converges to the defoaming net. The olefin preparation system can flush the waxy substance attached to the defoaming net of the suction tank, thereby ensuring the smooth progress of the production process.

Description

Technical Field

[0001] The present invention relates to the technical field of olefin preparation, and in particular to an olefin preparation system. Background Art

[0002] Methanol to Olefins (MTO) and Methanol to Propylene (MTP) are currently important chemical technologies. This technology uses methanol synthesized from coal or natural gas as raw material to produce low-carbon olefins. It is the core technology for developing non-petroleum resources to produce ethylene, propylene and other products.

[0003] In the prior art, during the operation of the compressor, washing oil is injected into the flow channel, that is, the cylinder oiling scheme, which can make the impeller surface of the compressor wet, thereby preventing the polymer from adhering to the impeller of the compressor, thereby extending the operating cycle of the compressor. However, some waxy substances will be entrained in the reaction gas from MTO, and these waxy substances will agglomerate on the defoaming net of a suction tank. In this way, not only will the suction flow of the reaction gas compressor be reduced, but it will also affect the operation of the MTO workshop, and in severe cases, it will also affect the production load, and even cause the compressor to surge, ultimately affecting the life of the unit. Summary of the invention

[0004] The object of the present invention is to provide an olefin preparation system, which can flush the waxy matter attached to the defoaming net of a suction tank, thereby ensuring the smooth progress of the production process.

[0005] The embodiment of the present invention is achieved as follows:

[0006] The embodiment of the present invention provides an olefin preparation system, comprising an unqualified ethylene recycling pipeline, a suction tank and a reaction gas compressor connected in sequence, wherein a defoaming net is arranged in the suction tank; the olefin preparation system also comprises a first flushing pipeline and a second flushing pipeline, wherein the first flushing pipeline is connected to the unqualified ethylene recycling pipeline, and the second flushing pipeline is connected to the suction tank, wherein the first flushing pipeline is used to pass a flushing agent into the unqualified ethylene recycling pipeline, and the second flushing pipeline is used to pass the flushing agent into the suction tank, so that the flushing agent converges to the defoaming net. The olefin preparation system can flush the waxy substance attached to the defoaming net of the suction tank, thereby ensuring the smooth progress of the production process.

[0007] Optionally, the olefin preparation system further comprises a reaction tower, wherein the reaction tower is connected to the first flushing pipeline and the second flushing pipeline respectively, and the flushing agent is a product of the reaction tower.

[0008] Optionally, the flushing agent is C5.

[0009] Optionally, a first pressure gauge is provided between the unqualified ethylene recycling pipeline and the first suction tank, and a second pressure gauge is provided between the first suction tank and the reaction gas compressor; the olefin preparation system also includes a controller and a first valve and a second valve electrically connected to the controller, respectively, the first valve is provided on the first flushing pipeline, and the second valve is provided on the second flushing pipeline, and the controller controls the first valve and the second valve respectively according to the comparison result based on the signals received from the first pressure gauge and the second pressure gauge respectively and comparing them with a preset first pressure difference threshold.

[0010] Optionally, the first pressure difference threshold value ranges from 0 to 5 Kpa.

[0011] Optionally, a first-stage filter is provided in the reaction gas compressor, and the olefin preparation system further comprises a third flushing pipeline, wherein the third flushing pipeline is connected to the first-stage filter, and the third flushing pipeline is used to pass the flushing agent into the first-stage filter so that the flushing agent converges to the first-stage filter.

[0012] Optionally, the front section and the rear section of the first filter are respectively provided with a third pressure gauge and a fourth pressure gauge, the olefin preparation system also includes a third valve electrically connected to the controller, the third valve is arranged on the third flushing pipeline, the controller compares the signals received from the third pressure gauge and the fourth pressure gauge respectively with a preset second pressure difference threshold, and controls the third valve according to the comparison result.

[0013] Optionally, the second pressure difference threshold value ranges from 5 to 12 KPa.

[0014] Optionally, a first drain condensate valve is provided on the side of the unqualified ethylene recycling pipeline close to the first suction tank, a spare port for instrument return sample is provided on the first suction tank, a second drain condensate valve is provided on the side of the first suction tank close to the first filter of the reaction gas compressor, the first flushing pipeline is connected to the first drain condensate valve, the second flushing pipeline is connected to the spare port, and the third flushing pipeline is connected to the second drain condensate valve.

[0015] Optionally, the olefin preparation system further comprises a wastewater stripping tower, which is connected to the first-stage suction tank and is used to accommodate waste liquid formed after the defoaming net is flushed and discharged through the first-stage suction tank.

[0016] The beneficial effects of the embodiments of the present invention include:

[0017] The olefin preparation system includes an unqualified ethylene recycling pipeline, a suction tank and a reaction gas compressor connected in sequence, and a defoaming net is arranged in the suction tank; the olefin preparation system also includes a first flushing pipeline and a second flushing pipeline, the first flushing pipeline is connected to the unqualified ethylene recycling pipeline, the second flushing pipeline is connected to the suction tank, the first flushing pipeline is used to pass the flushing agent into the unqualified ethylene recycling pipeline, and the second flushing pipeline is used to pass the flushing agent into the suction tank, so that the flushing agent converges to the defoaming net. In the actual production and preparation process, the flushing agent passed into the suction tank through the first flushing pipeline and the flushing agent passed into the suction tank through the second flushing pipeline can converge in the suction tank and flow to the surface of the defoaming net in the suction tank, so as to cooperate with each other to flush the lumps formed by the wax-like substance attached to the defoaming net, thereby avoiding the reduction of the suction flow of the reaction gas compressor and ensuring the smooth progress of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 One of the structural schematic diagrams of the olefin preparation system provided in an embodiment of the present invention;

[0020] Figure 2 The second structural schematic diagram of the olefin preparation system provided by the embodiment of the present invention;

[0021] Figure 3 The third structural schematic diagram of the olefin preparation system provided in an embodiment of the present invention.

[0022] Icons: 100-olefin preparation system; 10-unqualified ethylene recycling pipeline; 101-first row of condensate valves; 11-first stage suction tank; 111-foam removal net; 112-spare port; 12-reaction gas compressor; 121-first stage filter; 122-second row of condensate valves; 20-first flushing pipeline; 21-second flushing pipeline; 22-third flushing pipeline; 30-first valve; 31-second valve; 32-third valve; 40-controller; 50-first pressure gauge; 51-second pressure gauge; 52-third pressure gauge; 54-fourth pressure gauge. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Please refer to Figure 1This embodiment provides an olefin preparation system 100, comprising an unqualified ethylene recycling pipeline 10, a first suction tank 11 and a reaction gas compressor 12 connected in sequence, wherein a defoaming net 111 is provided in the first suction tank 11; the olefin preparation system 100 also comprises a first flushing pipeline 20 and a second flushing pipeline 21, wherein the first flushing pipeline 20 is connected to the unqualified ethylene recycling pipeline 10, and the second flushing pipeline 21 is connected to the first suction tank 11, wherein the first flushing pipeline 20 is used to pass a flushing agent into the unqualified ethylene recycling pipeline 10, and the second flushing pipeline 21 is used to pass a flushing agent into the first suction tank 11, so that the flushing agent converges to the defoaming net 111. The olefin preparation system 100 can flush the waxy substance attached to the defoaming net 111 of the first suction tank 11, thereby ensuring the smooth progress of the production process.

[0030] It should be noted that the olefin preparation system 100 provided in this embodiment includes an unqualified ethylene recycling pipeline 10, a suction tank 11 and a reaction gas compressor 12, wherein the unqualified ethylene recycling pipeline 10, the suction tank 11 and the reaction gas compressor 12 are connected in sequence. In other words, the unqualified ethylene recycling pipeline 10 is located upstream of the suction tank 11, and the suction tank 11 is located upstream of the reaction gas compressor 12.

[0031] In the process of olefin preparation, the reaction gas from MTO will be passed into a suction tank 11, and then passed into the reaction gas compressor 12 after being discharged from the suction tank 11. Since some waxy substances will be entrained in the reaction gas from MTO, these waxy substances will agglomerate on the defoaming net 111 in the suction tank 11 after the reaction gas is passed into the suction tank 11. Therefore, the suction flow rate of the reaction gas compressor 12 will be reduced, which will also affect the operation of the MTO workshop, seriously affect the production load, and even cause compressor surge, which will ultimately affect the life of the unit.

[0032] For this reason, Figure 1 As shown, the olefin preparation system 100 provided in this embodiment also includes a first flushing pipeline 20, which is connected to the unqualified ethylene recycling pipeline 10. The first flushing pipeline 20 is used to pass the flushing agent into the unqualified ethylene recycling pipeline 10, so that the flushing agent can flow through the first flushing pipeline 20 to the surface of the defoaming net 111 in the first suction tank 11, thereby flushing the agglomerates formed by the wax-like substances attached to the defoaming net 111, thereby avoiding the reduction of the suction flow of the reaction gas compressor 12 and ensuring the smooth progress of the production process. In addition, as Figure 1As shown, the olefin preparation system 100 provided in this embodiment also includes a second flushing pipeline 21, which is connected to a first suction tank 11. The second flushing pipeline 21 is used to pass a flushing agent into the first suction tank 11, so that the flushing agent can flow through the second flushing pipeline 21 to the surface of the defoaming net 111 in the first suction tank 11, thereby flushing the lumps formed by the wax-like substance attached to the defoaming net 111, thereby avoiding a reduction in the suction flow of the reaction gas compressor 12 and ensuring the smooth progress of the production process.

[0033] Of course, in other embodiments, the olefin preparation system 100 may further include a nozzle, which is fixedly connected to the flushing pipeline so that the flushing agent can flow through the flushing pipeline to the nozzle and be directly sprayed out, thereby flushing the lumps formed by the wax attached to the defoaming net 111. However, in this case, firstly, a special nozzle needs to be designed separately, and secondly, it will also cause an increase in production costs. Therefore, the olefin preparation system 100 provided in this embodiment connects the first flushing pipeline 20 with the unqualified ethylene recycling pipeline 10, and at the same time, connects the second flushing pipeline 21 with the first suction tank 11, so that the flushing agent can not only pass into the first suction tank 11 through the first flushing pipeline 20, but also pass into the first suction tank 11 through the second flushing pipeline 21. In other words, the flushing agent passed into the first suction tank 11 through the first flushing pipeline 20 and the flushing agent passed into the first suction tank 11 through the second flushing pipeline 21 can be gathered in the first suction tank 11 and flow to the surface of the defoaming net 111 in the first suction tank 11, so as to cooperate with each other to flush the lumps formed by the wax-like substance attached to the defoaming net 111, thereby avoiding the reduction of the suction flow of the reaction gas compressor 12 and ensuring the smooth progress of the production process.

[0034] Regarding the composition of the flushing agent, those skilled in the art should be able to reasonably select and design it according to the actual situation, and no specific restrictions are made here, as long as the flushing agent can have a certain dissolving effect on the waxy substance on the surface of the defoaming net 111. For example, the composition of the flushing agent is the raw material or product in the olefin preparation process. In this way, after the surface of the defoaming net 111 is flushed with the flushing agent, the flushing agent can be directly introduced into the downstream of the reaction gas compressor 12 to avoid the flushing agent from affecting the olefin preparation process. At the same time, there is no need to separately treat the waste liquid generated after flushing.

[0035] Regarding the structure and materials of the first flushing pipeline 20 and the second flushing pipeline 21, those skilled in the art should be able to make reasonable selections and designs according to actual conditions. No specific restrictions are made here. It is only necessary that the first flushing pipeline 20 can be sealed with the unqualified ethylene recycling pipeline 10, and the second flushing pipeline 21 can be sealed with a suction tank 11, and the first flushing pipeline 20 and the second flushing pipeline 21 can be used for the circulation of flushing agents, and when the flushing agents flow through the first flushing pipeline 20 and the second flushing pipeline 21, they will not react with the flushing agents.

[0036] In summary, the olefin preparation system 100 includes an unqualified ethylene recycling pipeline 10, a suction tank 11 and a reaction gas compressor 12 which are connected in sequence, and a defoaming net 111 is arranged in the suction tank 11; the olefin preparation system 100 also includes a first flushing pipeline 20 and a second flushing pipeline 21, the first flushing pipeline 20 is connected to the unqualified ethylene recycling pipeline 10, and the second flushing pipeline 21 is connected to the suction tank 11, the first flushing pipeline 20 is used to pass the flushing agent into the unqualified ethylene recycling pipeline 10, and the second flushing pipeline 21 is used to pass the flushing agent into the suction tank 11, so that the flushing agent converges to the defoaming net 111. During the actual production and preparation process, the flushing agent introduced into the first suction tank 11 via the first flushing pipeline 20 and the flushing agent introduced into the first suction tank 11 via the second flushing pipeline 21 can be gathered in the first suction tank 11 and flow to the surface of the defoaming net 111 in the first suction tank 11, thereby cooperating with each other to flush the lumps formed by the wax-like substance attached to the defoaming net 111, thereby avoiding a reduction in the suction flow of the reaction gas compressor 12 and ensuring the smooth progress of the production process.

[0037] like Figure 1 As shown, in this embodiment, the olefin preparation system 100 further includes a reaction tower, which is connected to the first flushing pipeline 20 and the second flushing pipeline 21 respectively, and the flushing agent is the product of the reaction tower.

[0038] It should be noted that the olefin preparation system 100 also includes a reaction tower, which is connected to a first flushing pipeline 20 and a second flushing pipeline 21 respectively, and the flushing agent is the product of the reaction tower. In other words, the two ends of the first flushing pipeline 20 are connected to the reaction tower and the unqualified ethylene recycling pipeline 10 respectively, so that the components in the product of the reaction tower that can serve as flushing agents can flow into the unqualified ethylene recycling pipeline 10 through the first flushing pipeline 20, and the two ends of the second flushing pipeline 21 are connected to the reaction tower and a first suction tank 11 respectively, so that the components in the product of the reaction tower that can serve as flushing agents can flow into the first suction tank 11 through the second flushing pipeline 21.

[0039] Optionally, the flushing agent is C5. First, C5 can dissolve the wax on the surface of the defoaming net 111 to a certain extent. Secondly, C5 is a product in the olefin preparation process. In this way, C5 as a product can be fully utilized, and after the surface of the defoaming net 111 is flushed with C5, C5 can be directly introduced into the downstream of the reaction gas compressor 12 to avoid the possible influence of the flushing agent on the olefin preparation process. At the same time, there is no need to separately treat the waste liquid generated after flushing.

[0040] like Figure 2 and Figure 3 As shown, in this embodiment, a first pressure gauge 50 is provided between the unqualified ethylene recycling pipeline 10 and a first suction tank 11, and a second pressure gauge 51 is provided between the first suction tank 11 and the reaction gas compressor 12; the olefin preparation system 100 also includes a controller 40 and a first valve 30 and a second valve 31 electrically connected to the controller 40, respectively, the first valve 30 is provided on the first flushing pipeline 20, and the second valve 31 is provided on the second flushing pipeline 21, and the controller 40 controls the first valve 30 and the second valve 31 respectively according to the comparison results based on the signals received from the first pressure gauge 50 and the second pressure gauge 51 and the preset first pressure difference threshold.

[0041] It should be noted that a first pressure gauge 50 is provided between the unqualified ethylene recycling pipeline 10 and a first suction tank 11, and a second pressure gauge 51 is provided between the first suction tank 11 and the reaction gas compressor 12. According to the readings of the first pressure gauge 50 and the second pressure gauge 51, it can be determined whether the suction flow of the reaction gas compressor 12 is affected, thereby inferring whether there are too many lumps formed by the wax-like substance on the defoaming net 111 in the first suction tank 11, thereby knowing whether the defoaming net 111 needs to be flushed.

[0042] The olefin preparation system 100 further includes a first valve 30, which is disposed on the first flushing pipeline 20 and is used to open and cut off the connection between the flushing agent supply source (e.g., the reaction tower) and the unqualified ethylene recycling pipeline 10. When the defoaming net 111 needs to be flushed, the first valve 30 is opened to allow the flushing agent to flow into the unqualified ethylene recycling pipeline 10 through the first flushing pipeline 20; when the defoaming net 111 does not need to be flushed, or the flushing is completed, the first valve 30 is closed to block the flushing agent there.

[0043] Similarly, the olefin preparation system 100 further includes a second valve 31, which is disposed on the second flushing pipeline 21 and is used to open and cut off the connection between the flushing agent supply source (e.g., the reaction tower) and the first suction tank 11. When the defoaming net 111 needs to be flushed, the second valve 31 is opened so that the flushing agent can flow into the first suction tank 11 through the second flushing pipeline 21; when the defoaming net 111 does not need to be flushed, or the flushing is completed, the second valve 31 is closed so that the flushing agent is blocked there.

[0044] In order to further improve the intelligent control of the olefin preparation system 100, the olefin preparation system 100 also includes a controller 40, which is electrically connected to the first valve 30 and the second valve 31 respectively. The controller 40 calculates the difference between the reading of the first pressure gauge 50 and the reading of the second pressure gauge 51 according to the signals of the first pressure gauge 50 and the second pressure gauge 51 respectively received (the controller 40 is electrically connected to the first pressure gauge 50 and the second pressure gauge 51 respectively to obtain the signal), and compares it with the preset first pressure difference threshold value, and controls the opening or closing of the first valve 30 and the second valve 31 respectively according to the comparison result. When the difference between the reading of the first pressure gauge 50 and the reading of the second pressure gauge 51 is less than the first pressure difference threshold, it means that the wax-like substance attached to the defoaming net 111 has formed fewer lumps, and has not yet caused serious impact on the suction flow of the reaction gas compressor 12. At this time, the controller 40 controls the first valve 30 and the second valve 31 to be closed; when the difference between the reading of the first pressure gauge 50 and the reading of the second pressure gauge 51 is greater than the first pressure difference threshold, it means that the wax-like substance attached to the defoaming net 111 has formed more lumps, which has caused serious impact on the suction flow of the reaction gas compressor 12. At this time, the controller 40 controls the first valve 30 and the second valve 31 to be opened.

[0045] Optionally, the value range of the first pressure difference threshold is 0 to 5 KPa. For example, the first pressure difference threshold may be 1 KPa, 2 KPa, 3 KPa, 4 KPa or 5 KPa, etc. Those skilled in the art should be able to make reasonable selections and designs according to actual conditions, and no specific limitations are made here.

[0046] like Figure 1 As shown, in this embodiment, a filter 121 is provided in the reaction gas compressor 12. During the olefin preparation process, the reaction gas from MTO will pass into the filter 121. Since some waxy substances will be entrained in the reaction gas from MTO, these waxy substances will agglomerate on the filter 121 after the reaction gas passes into the filter 121. Therefore, the suction flow of the reaction gas compressor 12 will be reduced, which will also affect the operation of the MTO workshop, seriously affect the production load, and even cause compressor surge, which will ultimately affect the life of the unit.

[0047] For this reason, Figure 1 As shown, the olefin preparation system 100 provided in this embodiment also includes a third flushing pipeline 22, which is connected to the first filter 121. The third flushing pipeline 22 is used to pass the flushing agent into the first filter 121 so that the flushing agent converges to the first filter 121, thereby flushing the agglomerates formed by the wax attached to the first filter 121, thereby avoiding the reduction of the suction flow of the reaction gas compressor 12 and ensuring the smooth progress of the production process.

[0048] like Figure 2 and Figure 3 As shown, in this embodiment, the front section and the rear section of the first filter 121 are respectively provided with a third pressure gauge 52 and a fourth pressure gauge 54, and the olefin preparation system 100 also includes a third valve 32 electrically connected to the controller 40, and the third valve 32 is arranged on the third flushing pipeline 22. The controller 40 compares the signals received from the third pressure gauge 52 and the fourth pressure gauge 54 with the preset second pressure difference threshold value, and controls the third valve 32 according to the comparison result.

[0049] It should be noted that the front section and the rear section of the first filter 121 are respectively provided with a third pressure gauge 52 and a fourth pressure gauge 54. According to the readings of the third pressure gauge 52 and the fourth pressure gauge 54, it can be determined whether the suction flow of the reaction gas compressor 12 is affected, thereby it can be deduced whether there are too many lumps formed by the wax on the first filter 121, so as to know whether the first filter 121 needs to be flushed.

[0050] The olefin preparation system 100 further includes a third valve 32, which is disposed on the third flushing pipeline 22 and is used to open and cut off the connection between the flushing agent supply source (e.g., the reaction tower) and the first filter 121. When the first filter 121 needs to be flushed, the third valve 32 is opened so that the flushing agent can flow into the first filter 121 through the third flushing pipeline 22; when the first filter 121 does not need to be flushed, or the flushing is completed, the third valve 32 is closed so that the flushing agent is blocked there.

[0051] In order to further improve the intelligent control of the olefin preparation system 100, the controller 40 is also electrically connected to the third valve 32. The controller 40 calculates the difference between the reading of the third pressure gauge 52 and the reading of the fourth pressure gauge 54 according to the signals received from the third pressure gauge 52 and the fourth pressure gauge 54 respectively (the controller 40 is electrically connected to the third pressure gauge 52 and the fourth pressure gauge 54 respectively to obtain the signals), and compares it with the preset second pressure difference threshold value, and controls the opening or closing of the third valve 32 according to the comparison result. When the difference between the reading of the third pressure gauge 52 and the reading of the fourth pressure gauge 54 is less than the second pressure difference threshold, it means that the wax-like substance attached to the first filter 121 forms fewer lumps, and has not yet caused a serious impact on the suction flow of the reaction gas compressor 12. At this time, the controller 40 controls the third valve 32 to close; when the difference between the reading of the third pressure gauge 52 and the reading of the fourth pressure gauge 54 is greater than the second pressure difference threshold, it means that the wax-like substance attached to the first filter 121 forms more lumps, which has caused a serious impact on the suction flow of the reaction gas compressor 12. At this time, the controller 40 controls the third valve 32 to open.

[0052] Optionally, the value range of the second pressure difference threshold is 5 to 12 KPa. For example, the second pressure difference threshold may be 5 KPa, 6 KPa, 7 KPa, 8 KPa, 9 KPa, 10 KPa, 11 KPa or 12 KPa, etc. Those skilled in the art should be able to make reasonable selections and designs according to actual conditions, and no specific restrictions are made here.

[0053] like Figure 1 As shown, for example, in this embodiment, a first condensate drain valve 101 is provided on the side of the unqualified ethylene recycling pipeline 10 close to a first suction tank 11, a spare port 112 for instrument return sampling is provided on the first suction tank 11, a second condensate drain valve 122 is provided on the side of the first suction tank 11 close to a first filter 121 of the reaction gas compressor 12, a first flushing pipeline 20 is connected to the first condensate drain valve 101 so that the first flushing pipeline 20 is connected to the unqualified ethylene recycling pipeline 10, a second flushing pipeline 21 is connected to the spare port 112 so that the second flushing pipeline 21 is connected to the first suction tank 11, and a third flushing pipeline 22 is connected to the second condensate drain valve 122 so that the third flushing pipeline 22 is connected to the first filter 121.

[0054] Optionally, the olefin preparation system 100 also includes a wastewater stripping tower, which is connected to a first suction tank 11. The wastewater stripping tower is used to accommodate waste liquid formed after the defoaming net 111 discharged from the first suction tank 11 is flushed, so as to avoid the waste liquid carrying waxy substances from flowing into the downstream reaction gas compressor 12, which may adhere to and agglomerate on the first filter 121, thereby further avoiding a reduction in the suction flow of the reaction gas compressor 12 and ensuring the smooth progress of the production process.

[0055] It is worth noting that since the waste liquid formed after flushing and discharged through the first filter 121 will no longer affect the suction flow of the reaction gas compressor 12, nor will it affect the olefin preparation process, the waste liquid formed after flushing and discharged through the first filter 121 does not need to be stored separately, but can be directly discharged into the downstream device.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An olefin production system, characterized in that: It comprises a defective ethylene recycling pipeline, a suction tank and a reaction gas compressor which are connected in sequence, wherein a defoaming net is arranged in the suction tank; The olefin preparation system further comprises a first flushing pipeline and a second flushing pipeline, wherein the first flushing pipeline is connected to the unqualified ethylene recycling pipeline, and the second flushing pipeline is connected to the first suction tank, wherein the first flushing pipeline is used to pass the flushing agent into the unqualified ethylene recycling pipeline, and the second flushing pipeline is used to pass the flushing agent into the first suction tank, so that the flushing agent converges to the defoaming net; The olefin preparation system also includes a reaction tower, which is connected to the first flushing pipeline and the second flushing pipeline respectively. The flushing agent is a product of the reaction tower. A first-stage filter is arranged in the reaction gas compressor. The olefin preparation system also includes a third flushing pipeline, which is connected to the first-stage filter. The third flushing pipeline is used to pass the flushing agent into the first-stage filter so that the flushing agent converges to the first-stage filter.

2. The olefin production system according to claim 1, characterized in that: The flushing agent is C5.

3. The olefin production system according to claim 1, characterized in that: A first pressure gauge is provided between the unqualified ethylene recycling pipeline and the first suction tank, and a second pressure gauge is provided between the first suction tank and the reaction gas compressor; The olefin preparation system also includes a controller and a first valve and a second valve electrically connected to the controller, respectively. The first valve is arranged on the first flushing pipeline, and the second valve is arranged on the second flushing pipeline. The controller compares the signals received from the first pressure gauge and the second pressure gauge with a preset first pressure difference threshold value, and controls the first valve and the second valve respectively according to the comparison result.

4. The olefin preparation system according to claim 3, characterized in that: The first pressure difference threshold value ranges from 0 to 5 KPa.

5. The olefin preparation system according to claim 3, characterized in that: The front section and the rear section of the first filter are respectively provided with a third pressure gauge and a fourth pressure gauge. The olefin preparation system also includes a third valve electrically connected to the controller. The third valve is arranged on the third flushing pipeline. The controller compares the signals received from the third pressure gauge and the fourth pressure gauge with a preset second pressure difference threshold value and controls the third valve according to the comparison result.

6. The olefin preparation system according to claim 5, characterized in that: The second pressure difference threshold value ranges from 5 to 12 KPa.

7. The olefin production system according to claim 1, characterized in that: A first row of condensate valve is provided on the side of the unqualified ethylene recycling pipeline close to the first suction tank, a spare port for instrument return sample is provided on the first suction tank, a second row of condensate valve is provided on the side of the first suction tank close to the first filter of the reaction gas compressor, the first flushing pipeline is connected to the first row of condensate valve, the second flushing pipeline is connected to the spare port, and the third flushing pipeline is connected to the second row of condensate valve.

8. The olefin production system according to claim 1, characterized in that: The olefin preparation system further comprises a wastewater stripping tower, which is connected to the first-stage suction tank and is used to accommodate waste liquid formed after the defoaming net is flushed and discharged through the first-stage suction tank.

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