A method for removing acidic gas using a cyclone device

Abstract

The present application discloses a method for removing acidic gas by using a cyclone device, comprising: connecting a connecting pipe containing a cyclone to the upper pipe of a pipeline, the top of the connecting pipe is provided with a gas phase outlet, the bottom of the connecting pipe is provided with an inlet, and the inlet is connected to the upper pipe of the pipeline; the internal cavity of the connecting pipe is a cyclone cavity, and a cyclone is provided in the cyclone cavity, and the cyclone is a single-cyclone cyclone or a double-cyclone cyclone. The cyclone uses centrifugal force and gravity to discharge the corrosive medium from the upper port of the cyclone, thereby achieving the technical effect of effectively isolating the corrosive acidic gas from the metal pipeline wall and preventing metal corrosion. The present application is simple to operate, has a significant separation effect, and plays an important role in the corrosion prevention and control of pipelines.

Description

Technical Field

[0001] The invention relates to the field of cyclone devices and pipeline corrosion protection, and in particular to a practical method for protecting industrial pipelines and preventing pipeline corrosion. Background Art

[0002] Today, as low-carbon economy becomes the trend of economic development, natural gas has become a very important clean energy. Hydrogen sulfide and carbon dioxide are among the acidic components with high content in natural gas, which not only reduce the quality of natural gas, but also cause corrosion of metal pipes and equipment in the presence of free water, thus bringing potential safety hazards and even polluting the environment and endangering human health. In addition, the surface of metal pipe materials is easily soaked by water vapor, and its hydrophobicity is poor, which easily causes corrosion of the pipe structure.

[0003] Corrosion is the main damage mode for most pressure vessels and pipelines, and improving corrosion resistance is crucial for pipelines. Corrosion can damage the metal surface, which in turn can cause the pipeline to fail due to corrosion and even cause serious accidents such as leakage or explosion, posing serious hidden dangers to the environment, corporate production, and people's property and life safety. In addition, during the transportation and utilization of natural gas, the acid gas in the pipeline must be removed, and various anti-corrosion measures will consume a lot of manpower and material resources. Therefore, if you want to achieve gas-liquid two-phase separation in the pipeline, removing the acid gas at the corroded pipeline wall is the top priority.

[0004] The movement of the fluid in the cyclone is a complex three-dimensional rotational flow, and the rotational movement of the fluid is referred to as vortex. The fluid enters from the cyclone inlet, and the main movements formed are "inner vortex" and "outer vortex". The outer vortex carries the fluid with larger particle size into the drip flow, and the fluid with smaller particle size is discharged from the overflow port by the inner vortex.

[0005] How to apply cyclone devices in pipeline protection to simply and effectively isolate corrosive acidic gases from the metal pipeline wall and prevent metal corrosion is a problem that technical personnel in this field need to solve. Summary of the invention

[0006] The object of the present invention is to provide a method for removing acidic gas in a pipe by using a cyclone device, so as to discharge the acidic gas accumulated in the engineering pipeline, thereby reducing corrosion to the pipeline and extending the service life of the pipeline.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for removing acidic gas in a pipe by using a cyclone device, comprising:

[0009] A connecting pipe is vertically threadedly connected to the upper wall of the upper pipe of the pipeline, a gas phase outlet is provided at the top of the connecting pipe, an inlet is provided at the bottom of the connecting pipe, and the inlet is communicated with the upper pipe of the pipeline; the internal cavity of the connecting pipe is a cyclone cavity, a cyclone is provided in the cyclone cavity, and the cyclone is a single cyclone cyclone or a double cyclone cyclone;

[0010] When the cyclone is working, after the multiphase liquid in the pipeline enters the cyclone chamber of the connecting pipe from the inlet at the bottom of the connecting pipe, the mixture rotates in the cyclone to generate centrifugal force and gravity separation, the liquid with higher density settles to the bottom of the connecting pipe along the pipe wall of the connecting pipe by gravity, and the gas with lower density is discharged from the gas phase outlet at the top of the connecting pipe, thereby achieving cyclone separation of gas and liquid.

[0011] Preferably, a threaded connection portion is provided at the bottom of the connecting pipe, and the connecting pipe is threadably connected to the pipeline via the threaded connection portion.

[0012] Preferably, when the cyclone is a double-cyclone cyclone, the cyclone comprises: an inner cyclone blade and an outer cyclone blade, the inner cyclone blade is arranged inside the outer cyclone blade, the outer periphery of the outer cyclone blade is provided with a cylindrical barrel, the center position of the inner cyclone blade has a center through hole for installing one end of a cyclone center rod, the other end of the cyclone center rod is fixedly connected to the bottom of the connecting pipe; the inner cyclone blade and the outer cyclone blade adopt a reverse cyclone structure, and the angle between the inner cyclone blade and the outer cyclone blade forms a channel for gas to flow through.

[0013] More preferably, the swirl center rod and the inner swirl blades, the inner swirl blades and the outer swirl blades, and the outer swirl blades and the cylinder wall of the cylinder are all connected by welding.

[0014] More preferably, the inner swirl blade and the outer swirl blade have different inclination angles.

[0015] In a preferred embodiment, the inclination angle of the inner swirl blade is 45°, and the inclination angle of the outer swirl blade is 40°.

[0016] More preferably, the inner swirl blade and the outer swirl blade have different numbers of blades.

[0017] In a preferred embodiment, the number of the inner swirl blades is 11, and the number of the outer swirl blades is 22.

[0018] Preferably, when the cyclone is a single-vortex cyclone, it comprises: a spiral impeller, wherein the spiral impeller has continuous blades from top to bottom, and the single-vortex cyclone is connected to the tube wall of the connecting tube by welding.

[0019] Preferably, when the cyclone is a double-cyclone cyclone, when the double-cyclone cyclone is working, the fluid in the pipeline enters the double-cyclone cyclone, the liquid with higher density flows along the tube wall of the connecting tube to the bottom cyclone port for collection, and the gas with lower density forms an inverted cone-shaped vortex surface in the center of the vortex and is discharged from the gas phase outlet at the top, thereby completing the gas-liquid two-phase cyclone separation.

[0020] Preferably, when the cyclone is a single-cyclone cyclone, when the single-cyclone cyclone is working, after the fluid in the pipeline enters the single-cyclone cyclone, the spiral guide vanes of the single-cyclone cyclone change the movement direction of the fluid, forming a strong vortex, and the fluid moves and rotates upward along the guide vanes. Due to the different densities of the gas phase and the liquid phase, the liquid phase is subjected to a larger centrifugal force after passing through the guide vanes and is concentrated on the side wall, while the gas phase is concentrated in the middle part, thereby achieving gas-liquid two-phase separation.

[0021] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0022] 1) The present invention is simple and convenient to operate, does not require special equipment, has the conditions for on-site construction, and has a wide range of applications.

[0023] 2) The separation process is continuous, the equipment occupies a small area, has no wearing parts, is easy to install and maintain, and has a wide range of applications.

[0024] 3) The present invention simultaneously meets the requirements of pipeline surface corrosion protection, reduces the safety risk of the pipeline, and prolongs the service life of the pipeline. The use of the present invention can save manpower, material resources and financial resources to a certain extent, thereby obtaining greater economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0026] Figure 1 It is a top view structure of the double cyclone cyclone in the connecting pipe;

[0027] Figure 2 It is the front view structure of the connecting pipe containing the double cyclone cyclone;

[0028] Figure 3 It is the front view structure of the connecting pipe containing the single-swirl cyclone flow device;

[0029] Figure 4 It is a schematic diagram of the overall structure after the connecting pipe of the double cyclone cyclone is connected to the pipeline;

[0030] Figure 5It is a schematic diagram of the overall structure after the connecting pipe of the single cyclone cyclone is connected to the pipeline;

[0031] Figure 6 This is the separation efficiency diagram after using a cyclone to separate the gas and liquid phases in a pipeline within 11 seconds.

[0032] Legend:

[0033] 1. Cyclone center rod;

[0034] 2. The whole part of the double swirl blade; 201. The inner swirl blade; 202. The connection between the inner swirl blade and the outer swirl blade; 203. The outer swirl blade; 204. The wall of the double swirler;

[0035] 3. Thread at the bottom of the connecting pipe;

[0036] 4. The wall of the connecting pipe containing double cyclones;

[0037] 5. Single cyclone swirl blade;

[0038] 6. Pipe wall;

[0039] 7. Contains a single cyclone connected to the pipe wall. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] The purpose of the present invention is to discharge the acidic gas accumulated in the engineering pipeline, thereby reducing the corrosion to the pipeline and extending the service life of the pipeline. In actual engineering, the corrosion of the pipeline by the gas-liquid two-phase flow is relatively serious, and the released acidic gas will mostly accumulate on the upper wall of the pipeline, thereby causing corrosion of the pipeline wall and causing a large amount of economic losses. In order to avoid the situation of pipeline corrosion caused by the accumulation of pipeline acidic gas, reduce the corrosion to the pipeline and extend the service life of the pipeline, the present invention adopts a connecting pipe containing a cyclone connected to the upper pipe of the experimental pipeline to discharge the acidic gas accumulated at the upper pipe. Most of the acidic gas accumulates on the upper wall of the pipeline, so a threaded connection (convenient replacement) is used here to connect the connecting pipe containing the cyclone, and the acidic gas in the pipeline can be thrown out by the installed swirl blades, thereby achieving the effect of pipeline anti-corrosion. Its main principle is to achieve efficient separation of gas and liquid in the pipeline through the centrifugal force and gravity generated by the swirl.

[0043] The cyclone is a device that uses the centrifugal sedimentation principle to separate multiple phases in a flow field. The technical solution of the present invention adopts two types of cyclones to achieve gas-liquid two-phase separation, namely a single-cyclone cyclone and a double-cyclone cyclone.

[0044] Specifically, the present invention discloses a method for removing acidic gas in a pipe by using a cyclone device, comprising: vertically threading a connecting pipe at the upper wall surface of the upper pipe of the pipeline, the top of the connecting pipe is provided with a gas phase outlet, the bottom of the connecting pipe is provided with an inlet, the inlet is connected to the upper pipe of the pipeline; the internal cavity of the connecting pipe is a cyclone cavity, the cyclone cavity is provided with a cyclone, and the cyclone is a single-cyclone cyclone or a double-cyclone cyclone. When the cyclone is working, after the multiphase liquid in the pipeline enters the cyclone cavity of the connecting pipe from the inlet at the bottom of the connecting pipe, the mixture rotates in the cyclone to generate centrifugal force and gravity separation, the liquid with higher density settles to the bottom of the connecting pipe by gravity along the wall of the connecting pipe, and the gas with lower density is discharged from the gas phase outlet at the top of the connecting pipe, thereby achieving cyclone separation of gas and liquid.

[0045] Embodiment 1:

[0046] Figure 1 The top view of the double cyclone cyclone in the connecting pipe is shown. In the figure, number 1 is the cyclone center rod, number 201 is the inner cyclone blade, number 202 is the connection between the inner cyclone blade and the outer cyclone blade, which is connected by welding, number 203 is the outer cyclone blade, number 204 is the double cyclone cylinder wall, and numbers 1 and 201, 201 and 202, 202 and 203, and 203 and 204 are all welded.

[0047] Figure 2The figure shows the front view structure of the connecting pipe with double cyclone. In the figure, number 1 is the cyclone center rod, number 2 is the whole part of the double cyclone blades, number 3 is the thread at the bottom of the connecting pipe, which is connected to the pipeline by threaded connection. The reason for using this connection method is to facilitate the replacement of the connecting pipe, and number 4 is the wall of the connecting pipe with double cyclone.

[0048] See also Figure 1-2 As shown, the double-swirl cyclone includes: an inner swirl blade 201 and an outer swirl blade 203, the inner swirl blade 201 is arranged inside the outer swirl blade 203, the outer periphery of the outer swirl blade 203 is provided with a cylindrical barrel, the center position of the inner swirl blade 201 has a central through hole for mounting one end of a swirl center rod 1, and the other end of the swirl center rod 1 is fixedly connected to the bottom of the connecting pipe; the inner swirl blade 201 and the outer swirl blade 203 adopt a reverse swirl structure, and the angle between the inner swirl blade 201 and the outer swirl blade 203 forms a channel for gas to flow through.

[0049] The inner swirl blade 201 and the outer swirl blade 203 have different inclination angles. For example, the inclination angle of the inner swirl blade 201 is 45°, and the inclination angle of the outer swirl blade 203 is 40°. The number of the inner swirl blade 201 and the number of the outer swirl blade 203 are different. For example, the number of the inner swirl blade 201 is 11, and the number of the outer swirl blade 203 is 22.

[0050] Figure 4 It shows the overall structure of the connecting pipe of the double cyclone cyclone connected to the pipeline. Number 1 is the cyclone center rod, number 2 is the whole part of the double cyclone blade, number 3 is the bottom thread of the connecting pipe, which is connected to the pipeline thread, number 4 is the wall of the connecting pipe containing the double cyclone, and number 6 is the wall of the pipeline.

[0051] Its working principle is:

[0052] Gas-liquid two-phase mixture Figure 4 The acid gas will accumulate on the upper wall of the pipe when it enters the pipe from the middle inlet. Due to the pressure inside the pipe, the fluid will enter the cyclone at a certain speed and rotate in the cyclone. Under the centrifugal force generated by the rotation and the action of gravity, the liquid with higher density will be collected along the wall of the connecting pipe to the cyclone outlet at the bottom, and the gas with lower density will form an inverted cone vortex surface in the center of the vortex and be discharged from the overflow outlet at the top of the cyclone, thus completing the gas-liquid two-phase cyclone separation.

[0053] Embodiment 2:

[0054] Figure 3The figure shows the front view structure of the connecting pipe with a single cyclone. In the figure, number 3 indicates the thread at the bottom of the connecting pipe, which is connected to the pipeline by threaded connection, number 5 indicates a single cyclone blade, number 7 is a connecting pipe wall with a single cyclone, and is welded to the single cyclone. The cyclone blade of the single cyclone cyclone is a spiral impeller, and the cyclone blade is a continuous blade from top to bottom.

[0055] Figure 5 It shows the overall structure of the connection pipe of the single cyclone cyclone connected to the pipeline. Number 3 is the bottom thread of the connection pipe, which is connected to the pipeline thread, number 5 is the cyclone blade of the single cyclone, number 6 is the pipeline wall, and number 7 is the wall of the connection pipe containing the single cyclone.

[0056] Its working principle is:

[0057] Compared with the double cyclone method, the single cyclone method is used to remove acidic gases. After the fluid in the pipeline enters the cyclone, the guide vanes change the direction of the fluid movement, forming a strong cyclone. The fluid moves upward along the cyclone vanes. Due to the different densities of the gas phase and the liquid phase, the liquid phase is subjected to a large centrifugal force after passing through the guide vanes and is concentrated on the side wall, while the gas phase is concentrated in the middle part, thereby achieving gas-liquid separation.

[0058] Experimental results:

[0059] Figure 6 It shows the separation efficiency diagram after using a cyclone to separate the gas and liquid phases in the pipeline within 11 seconds.

[0060] pass Figure 6 It can be obtained that the separation efficiency fluctuation of H2S gradually stabilizes with the increase of time, and the separation efficiency is mostly concentrated at around 99.8%, which has a good separation efficiency. Therefore, the use of cyclones can well complete the gas-liquid separation of pipelines and extend the service life of pipelines.

[0061] In summary, the present invention connects a connecting pipe containing a cyclone to the upper pipe of the pipeline. The cyclone discharges the corrosive medium from the upper opening of the cyclone through the action of centrifugal force and gravity, thereby achieving the technical effect of effectively isolating the corrosive acid gas from the metal pipeline wall and preventing metal corrosion. This method is simple to operate, has a significant separation effect, and plays an important role in the corrosion prevention and control of pipelines.

[0062] The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, the equalization changes and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims

1. A method for removing acidic gas in a pipe using a cyclone device, characterized in that: include: A connecting pipe is vertically threadedly connected to the upper wall of the upper pipe of the pipeline, a gas phase outlet is provided at the top of the connecting pipe, an inlet is provided at the bottom of the connecting pipe, and the inlet is communicated with the upper pipe of the pipeline; the internal cavity of the connecting pipe is a cyclone cavity, a cyclone is provided in the cyclone cavity, and the cyclone is a single cyclone cyclone or a double cyclone cyclone; When the cyclone is working, the multiphase liquid in the pipeline enters the cyclone chamber of the connecting pipe from the inlet at the bottom of the connecting pipe, and the mixture rotates in the cyclone to generate centrifugal force and gravity separation. The liquid with higher density settles to the bottom of the connecting pipe along the wall of the connecting pipe by gravity, and the gas with lower density is discharged from the gas phase outlet at the top of the connecting pipe, thereby achieving cyclone separation of gas and liquid; Wherein, when the cyclone is a double-cyclone cyclone, the cyclone comprises: an inner cyclone blade and an outer cyclone blade, the inner cyclone blade is arranged inside the outer cyclone blade, a cylindrical barrel is arranged on the outer periphery of the outer cyclone blade, a central through hole is arranged at the center of the inner cyclone blade for mounting one end of a cyclone center rod, and the other end of the cyclone center rod is fixedly connected to the bottom of the connecting pipe; the inner cyclone blade and the outer cyclone blade adopt a reverse cyclone structure, and the angle between the inner cyclone blade and the outer cyclone blade forms a channel for gas to flow through; when the double-cyclone cyclone is working, the fluid in the pipeline enters the double-cyclone cyclone, the liquid with higher density flows along the wall of the connecting pipe to the bottom cyclone port for collection, and the gas with lower density forms an inverted cone-shaped vortex surface in the center of the vortex, and is discharged from the gas phase outlet at the top, thereby completing the cyclone separation of gas and liquid two phases; Wherein, when the cyclone is a single-cyclone cyclone, the cyclone comprises: a spiral impeller, the spiral impeller is a continuous blade from top to bottom, and the single-cyclone cyclone is welded to the pipe wall of the connecting pipe; when the single-cyclone cyclone is working, after the fluid in the pipeline enters the single-cyclone cyclone, the spiral guide blades of the single-cyclone cyclone change the movement direction of the fluid, forming a strong vortex, and the fluid moves and rotates upward along the guide blades. Due to the different densities of the gas phase and the liquid phase, the liquid phase is subjected to a larger centrifugal force after passing through the guide blades and is concentrated on the side wall, while the gas phase is concentrated in the middle part, thereby realizing gas-liquid two-phase separation.

2. A method for removing acidic gas in a pipe using a cyclone device according to claim 1, characterized in that: A threaded connection portion is provided at the bottom of the connecting pipe, and the connecting pipe is threadedly connected to the pipeline through the threaded connection portion.

3. The method for removing acidic gas in a pipe by using a cyclone device according to claim 1, characterized in that: When the cyclone is a double-cyclone cyclone, the cyclone center rod and the inner cyclone blades, the inner cyclone blades and the outer cyclone blades, and the outer cyclone blades and the cylinder wall of the cylinder are all connected by welding.

4. The method for removing acidic gas in a pipe by using a cyclone device according to claim 1, characterized in that: When the cyclone is a double-cyclone cyclone, the inner cyclone blades and the outer cyclone blades have different inclination angles, and the inner cyclone blades and the outer cyclone blades have different numbers of blades.

5. A method for removing acidic gas in a pipe using a cyclone device according to claim 4, characterized in that: The inclination angle of the inner swirl blade is 45°, and the inclination angle of the outer swirl blade is 40°.

6. A method for removing acidic gas in a pipe using a cyclone device according to claim 4, characterized in that: The number of the inner swirl blades is 11, and the number of the outer swirl blades is 22.

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