Filtering device for natural gas transportation

Abstract

The invention relates to the technical field of natural gas pretreatment, in particular to a filtering device for natural gas transportation, which comprises a cooling pipeline at a cooling part of pressure drop equipment, a filtering container sleeving the cooling pipeline, and a filtering piece sleeving the top of the cooling pipeline, the filter part is sleeved with a partition plate, the partition plate forms a backflow cavity on the outer ring of the filter part, and the output end of the cooling pipeline communicates with a backflow pipe; the bottom of the partition plate is fixedly connected with a dewatering ring which sleeves the top of the filtering part and the cooling pipeline, the dewatering ring is sunken downwards to form a tubular dewatering ring groove, a dewatering pipe which is fixed to the partition plate and communicates with the backflow cavity is arranged in the dewatering ring groove, and an alkaline liquid dewatering agent is contained in the dewatering ring groove; air holes are formed in the outer wall of the dehydration ring groove and attached to the outer wall of the filtering piece, a containing assembly used for containing condensate water is arranged at the bottom of the filtering container, and a natural gas output end is arranged on the side portion of the filtering container. The natural gas pretreatment device can reduce corrosion to the pipeline in the natural gas pretreatment process in a limited space.

Description

Technical Field

[0001] The present application relates to the field of natural gas pretreatment technology, and in particular to a filtering device for natural gas transportation. Background Art

[0002] Natural gas is one of the commonly used fuels in daily urban life. It is usually transported over long distances through pipeline technology. In order to maintain long-distance transportation, natural gas is pressurized to maintain the transportation pressure and power. Since there are clear regulations on the pressure of household natural gas, in the current industrial process of natural gas extraction and transportation, natural gas is usually throttled and depressurized and then filtered and pretreated before it can be supplied to users.

[0003] However, during the pretreatment process, especially during the throttling and depressurization process, since the pressure of natural gas drops too sharply, the temperature at the throttling and depressurization position will drop suddenly. For example, the inlet pipe of the pressure reducing valve and the pressure reducing valve are prone to ice blockage, which reduces the flow capacity of the pipeline, causes solid impurities to accumulate and block the pipeline or causes physical damage, or damages the valves and instruments. At the same time, during the process of temperature reduction due to pressure drop during the transportation of high-pressure natural gas, natural gas hydrates or some fine particles are often formed, and larger solid particles or impurities are formed, which will cause erosion damage to the pipe wall.

[0004] In the prior art, the commonly used methods are heating and insulation or multi-stage pressure regulation; but in actual use, simple heat preservation and heating, although it will slow down the icing phenomenon, still cannot avoid the generation of condensed water. Combined with external oxygen and relatively high temperature, it is very easy to corrode the pipeline; and multi-stage pressure reduction often requires more or larger equipment to complete, and requires relatively more space. Therefore, how to reduce the corrosion of the pipeline during the natural gas pretreatment process in a limited space is an urgent problem to be solved at present. Summary of the Invention

[0005] In order to reduce the corrosion of the pipeline during the natural gas pretreatment process in a limited space, the present application provides a filtering device for natural gas transportation.

[0006] A filtering device for natural gas transportation provided by the present application adopts the following technical solutions: A filtering device for natural gas transportation, comprising a cooling pipeline at the cooling part of the pressure drop device, a filtering container sleeved outside the cooling pipeline, and a filtering element sleeved outside the top of the cooling pipeline; an annular partition plate is sleeved outside the filtering element, and the partition plate forms a reflux cavity on the outer ring relative to the filtering element. The output end of the cooling pipeline is communicated with a reflux pipe that returns the cooled natural gas to the reflux cavity. At least part of the reflux pipe is located outside the filtering container and is provided with a heating element for heating; the bottom of the partition plate is fixedly connected with a dehydration ring sleeved outside the top of the filtering element and the cooling pipeline. The dehydration ring is concave to form a tubular dehydration ring groove, and a plurality of dehydrating pipes fixed to the partition plate and communicated with the reflux cavity are arranged in the dehydration ring groove. An alkaline liquid dehydrating agent is accommodated in the dehydration ring groove; at least the top part of the outer wall of the dehydration ring groove is provided with air holes and is attached to the outer wall of the filtering element. The bottom of the filtering container is provided with a receiving assembly for accommodating condensed water, and the side part of the filtering container is provided with an output end for natural gas.

[0007] By adopting the above technical solution, during the transportation of natural gas, the natural gas after pressure reduction will be output through the cooling pipeline, and its temperature will be significantly reduced in the cooling pipeline, and then it will be input into the reflux cavity through the reflux pipe. At this time, heating the reflux pipe can increase the temperature of the natural gas entering the reflux cavity, and at the same time, it can also radiate the filtering container through heat transfer, significantly reducing the condensation water generated on the outer wall of the filtering container due to natural gas; the heated natural gas enters the alkaline liquid dehydrating agent in the dehydration ring groove, and at this time, it can perform the first dehydration pretreatment on the natural gas, and the alkaline liquid dehydrating agent can also neutralize the sulfide in the natural gas to a certain extent. After the dehydration pretreatment, the natural gas passes through the filtering element to filter impurities and then enters the inside of the filtering container and contacts the cooling pipeline. Since the temperature of the cooling pipeline is relatively low and the temperature of the filtered natural gas is relatively high, the temperature difference is relatively large, and secondary dehydration can be carried out by means of condensation dehydration on the outer wall of the cooling pipeline. And because the inside of the filtering container has been dehydrated by the alkaline liquid dehydrating agent, the sulfide is significantly reduced and the oxygen content is extremely low. Even if there is water, the possibility of corrosion to the cooling pipeline can be significantly reduced. At the same time, it can also perform a temperature increase pretreatment on the natural gas in the cooling pipeline to significantly reduce the possibility of condensation water generated on the outer wall of the filtering container. Compared with the multi-stage pressure drop that requires multiple pressure drop devices to be connected in series, the structure of internal and external superposition can effectively reduce the required space, so that the corrosion of the pipeline during the natural gas pretreatment process can be reduced in a limited space; and the condensed water can be received and stored by the receiving assembly.

[0008] Optionally, an input valve for controlling the input of the alkaline liquid dehydrating agent is provided at the top of the dehydration ring groove and extends out of the filtering container; an output valve for controlling the output of the alkaline liquid dehydrating agent is provided at the bottom of the dehydration ring groove and extends out of the filtering container.

[0009] By adopting the above technical solution, it is possible to replace the alkaline liquid dehydrating agent in the dehydration ring groove in real time during the pretreatment process of natural gas.

[0010] Optionally, the filter element includes a plurality of filter plates arranged around the cooling pipeline. The filter plates are in an arc-shaped plate structure and are attached to the outer wall of the cooling pipeline. The filter plates are inserted from the top of the filter container. The inner ring of the partition plate is attached to the outer wall of the filter plate, and the inner ring of the partition plate extends towards the top wall of the filter container and is fixed to the inner wall of the filter container. A cover plate for covering and sealing the protruding part of the filter plate is detachably fixed to the top of the filter container.

[0011] By adopting the above technical solution, since the filter element is arranged between the partition plate and the cooling pipeline and is in an insertion fit, when the filter element needs to be replaced, it is only necessary to remove the cover plate, pull out the filter plate for replacement, and then cover the cover plate for sealing.

[0012] Optionally, a plurality of cooling fins are arranged on the outer wall of the part of the cooling pipeline located inside the filter container.

[0013] By adopting the above technical solution, the cooling fins can fully contact more relatively high-temperature natural gas after filtration and transfer the heat to the cooling pipeline. While fully heating the inside of the cooling pipeline, it can also fully carry out secondary condensation dehydration treatment through the full contact of the cooling fins.

[0014] Optionally, the plurality of cooling fins are divided into several groups and arranged around the cooling pipeline. The multiple cooling fins in the same group are distributed along the axial direction of the cooling pipeline or in a spiral direction with the axial direction of the cooling pipeline as the spiral center.

[0015] By adopting the above technical solution, when the natural gas contacts the cooling fins, it can flow downward in a spiral manner. And because the cooling fins are arranged in a staggered manner, it can further fully contact the natural gas to achieve the purpose of full condensation dehydration.

[0016] Optionally, a plurality of buffer plates are respectively arranged on the corresponding inner and outer tank walls inside the dehydration ring groove along the axial direction of the cooling pipeline, and the buffer plates adjacent to each other along the axial direction of the cooling pipeline are respectively located on the opposite tank walls of the dehydration ring groove and are arranged in an alternating manner.

[0017] By adopting the above technical solution, after the natural gas is output from the dehydration pipe, relatively more bubbles will be formed in the liquid dehydrating agent in the dehydration ring groove. Since the generated bubbles will disturb the liquid dehydrating agent and affect the dehydration effect, the presence of the buffer plate will make the rising path of the formed bubbles in the dehydration ring groove be a broken line. During this process, the bubbles will impact the buffer plate. On the one hand, it will have a flushing effect on the buffer plate and be carried away during the replacement of the liquid dehydrating agent. On the other hand, more and smaller bubbles will be formed when the bubbles contact the buffer plate, and during the process of bubble breaking, they will fully contact the liquid dehydrating agent to fully carry out dehydration and desulfurization treatment. At the same time, the buffer plate can also inhibit the tumbling of the liquid dehydrating agent.

[0018] Optionally, a plurality of flow disturbing members are provided on the groove wall of the dehydration ring groove. The flow disturbing members include a floating plate rotatably provided on the inner wall of the dehydration ring groove and a flow disturbing plate rotatably provided on the periphery of the corresponding cooling pipe inside the dehydration ring. The rotation center of the flow disturbing plate is coaxially connected to the rotation center of the floating plate through a connecting shaft, and the floating plate is floatingly provided in the dehydration ring groove.

[0019] By adopting the above technical solution, when bubbles are generated and broken in the dehydration ring groove, an impact force will be generated. At the same time, the tumbling liquid dehydrating agent will push the floating plate to swing. The swinging floating plate will drive the flow disturbing plate to swing through the connecting shaft. Since the generation of bubbles and the tumbling of the liquid dehydrating agent are both irregular phenomena, the swinging of the flow disturbing plate will also be irregular, so as to irregularly disturb the natural gas around the cooling fins, making the filtered natural gas further fully contact the cooling fins and perform secondary condensation dehydration treatment; in addition, the floating plate can also synchronously inhibit the tumbling of the liquid dehydrating agent; at the same time, the swinging floating plate can further break the nearby bubbles and further optimize the dehydration effect of the liquid dehydrating agent.

[0020] Optionally, the floating plate is arranged along the central axis direction of the dehydration ring groove and a floating cavity is provided at the top, and the thickness of the floating plate gradually decreases from top to bottom.

[0021] By adopting the above technical solution, the top of the floating plate will be used as the swinging part. Compared with the lower part being used as the swinging part, at this time, the lower part of the floating plate is used as the rotation center and the top floats and swings, which will make both outer walls of the floating plate fully contact the bubbles, further optimizing the probability of contact with the bubbles and achieving the purpose of optimizing the dehydration efficiency.

[0022] Optionally, the accommodating component includes a condensation container with an upward opening and a plurality of condensation plates arranged in the condensation container. The upper opening edge of the condensation container is fixedly connected to the bottom of the filtering container. The condensation plates are divided into two groups and are arranged oppositely. The edges of the two groups of condensation plates away from each other are fixed to the inner wall of the condensation container. The two groups of condensation plates are inclined towards the bottom on the side facing each other, and the two groups of condensation plates are arranged in an interleaved manner. A drain valve for draining water regularly is provided at the bottom of the condensation container.

[0023] By adopting the above technical solution, the condensed water will fall into the condensation container, and the presence of the condensation plates will make the flow of natural gas on the surface of the collected condensed water relatively slow, so as to reduce the volatilization of the condensed water.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. When transporting natural gas, the natural gas after pressure reduction will be output through the cooling pipeline, and the temperature will be significantly reduced in the cooling pipeline, and then input into the reflux cavity through the return pipe. At this time, heating the return pipe can increase the temperature of the natural gas entering the reflux cavity, and at the same time, it can also radiate the filtering container through heat transfer, significantly reducing the condensation water generated on the outer wall of the filtering container due to natural gas; the natural gas after heating enters the alkaline liquid dehydrating agent in the dehydration ring groove. At this time, it can perform the first dehydration pretreatment on the natural gas, and the alkaline liquid dehydrating agent can also neutralize the sulfide in the natural gas to a certain extent. After the dehydration pretreatment, the natural gas passes through the filter element to filter impurities and then enters the inside of the filtering container and contacts the cooling pipeline. Since the temperature of the cooling pipeline is relatively low and the temperature of the filtered natural gas is relatively high, the temperature difference is relatively large, and secondary dehydration can be carried out by means of condensation dehydration on the outer wall of the cooling pipeline. And because the inside of the filtering container has been dehydrated by the alkaline liquid dehydrating agent, the sulfide is significantly reduced and the oxygen content is extremely low. Even if there is water, the possibility of corrosion of the cooling pipeline can be significantly reduced.

[0025] 2. The natural gas filtered by the filter element enters the periphery of the cooling pipeline, and can also perform a temperature increase pretreatment on the natural gas in the cooling pipeline, so as to significantly reduce the possibility of condensation water generated on the outer wall of the filtering container when the natural gas in the cooling pipeline exits the filtering container. And compared with the multi-stage pressure drop that requires a series of multiple pressure drop devices, the structure of internal and external superposition can effectively reduce the required space, so as to reduce the corrosion of the pipeline during the natural gas pretreatment process in a limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic cross-sectional structure diagram of this embodiment.

[0027] Figure 2 is Figure 1 an enlarged schematic structure diagram of part A in

[0028] Figure 3 It is a schematic diagram of the floating plate along the axial direction of the connecting shaft in this embodiment.

[0029] Explanation of reference numerals: 1, cooling pipeline; 11, return pipe; 12, cooling fins; 2, filter container; 20, cover plate; 21, partition plate; 22, return cavity; 23, dehydration ring; 231, dehydration ring groove; 232, dehydration pipe; 233, input valve; 234, output valve; 235, buffer plate; 24, heating element; 3, filter element; 31, filter plate; 4, accommodation assembly; 41, condensation container; 42, condensation plate; 43, drain valve; 5, flow disturbing element; 51, floating plate; 511, floating cavity; 52, flow disturbing plate; 53, connecting shaft. Detailed implementation manners

[0030] The following will further describe this application in detail with reference to the attached Figures 1-3 drawings.

[0031] An embodiment of this application discloses a filtering device for natural gas transportation. Refer to Figure 1 and Figure 2 , a filtering device for natural gas transportation includes a cooling pipeline 1, a filter container 2 and a filter element 3. The cooling pipeline 1 is a pressure drop part of a pressure drop device and will cool down and is prone to icing or generating condensate, such as the pipeline at the output part of a pressure reducing valve. Among them, the cooling pipeline 1 is vertically arranged.

[0032] The filter container 2 is vertically arranged. At least the middle and lower parts of the cooling pipeline 1 penetrate into the filter container 2 from the top and are arranged with the same central axis, so that the filter container 2 can wrap the cooling pipeline 1. The filter element 3 is arranged at the top inside the filter container 2 and is sleeved outside the cooling pipeline 1.

[0033] A partition plate 21 is arranged outside the filter element 3. The partition plate 21 is in a ring structure and is horizontally arranged. The inner ring of the partition plate 21 is bent upwards and fixedly connected to the inner wall of the top surface of the filter container 2. The outer ring of the partition plate 21 extends horizontally towards the outside and is fixedly connected to the inner wall of the filter container 2, and a return cavity 22 is formed in the part corresponding to the inside of the filter container 2 outside the partition plate 21, that is, the return cavity 22 is in a ring structure, and the part where the partition plate 21 is bent upwards fits the outer wall of the top of the filter element 3. Of course, in other implementation manners, the cross-sectional profile of the partition plate 21 can also be set as an arc or other structures, as long as a ring-shaped return cavity 22 can be formed outside the partition plate 21.

[0034] Refer to Figure 1 and Figure 2, the part of the cooling pipeline 1 inside the filtering container 2 is fixed and connected with a return pipe 11, and the other end of the return pipe 11 is connected to the return cavity 22. And the middle part of the return pipe 11 first penetrates out of the filtering container 2, and then is connected to the return cavity 22 from the top of the filtering container 2, so that the return pipe 11 is integrally U-shaped and horizontally arranged facing the opening of the filtering container 2. Of course, in other embodiments, the return pipe 11 can also be directly bent upward to be connected to the return cavity 22.

[0035] Meanwhile, a heating member 24 for heating is arranged on the part of the return pipe 11 outside the filtering container 2 to preheat the natural gas before filtration. The heating member 24 can adopt electric heating. Of course, in this embodiment, the heating member 24 adopts an electromagnetic heating coil to uniformly heat the natural gas.

[0036] Refer to Figure 1 and Figure 2 , in addition, the bottom wall of the horizontal part of the partition plate 21 is fixedly connected with a dehydration ring 23. The dehydration ring 23 is sleeved outside the filtering element 3 and the cooling pipeline 1. The inner and outer circles of the dehydration ring 23 are fixedly connected to the partition plate 21, and a dehydration ring groove 231 is formed by concave molding in the middle part between the inner and outer circles of the dehydration ring 23. The dehydration ring groove 231 is arranged around the filtering element 3 and the cooling pipeline 1, and at least the upper part of the outer wall of the dehydration ring groove 231 corresponding to the inner side of the partition plate 21 is attached to the outer wall of the filtering element 3. Among them, a liquid dehydrating agent with an alkaline pH value is accommodated in the dehydration ring groove 231, such as a solution of monoethanolamine, diethanolamine and diisopropanolamine.

[0037] Refer to Figure 1 and Figure 2 , a plurality of circumferentially distributed drain pipes 232 are arranged in the dehydration ring groove 231. The upper ends of the drain pipes 232 are fixed to the partition plate 21, and through holes are formed in the partition plate 21 corresponding to the parts where the drain pipes 232 are fixed, so that natural gas can enter the dehydration ring groove 231 and be pre-dehydrated through the liquid dehydrating agent. At the same time, a plurality of air holes are formed at the top of the dehydration ring groove 231 corresponding to the filtering element 3, so that the natural gas after pre-dehydration treatment can first pass through the filtering of the filtering element 3 and then enter the middle and lower positions of the filtering container 2. At this time, due to the relatively low temperature of the cooling pipeline 1, secondary dehydration can be carried out by condensation.

[0038] In addition, since the natural gas has been pre-treated by dehydration with an alkaline liquid dehydrating agent, on the one hand, the water content is reduced, and on the other hand, the possibility of corrosion of the cooling pipeline 1 caused by acidic substances in the water after the condensation of natural gas is effectively reduced; secondly, since the natural gas fills the inside of the filtering container 2, the cooling pipeline 1 can effectively reduce the contact with oxygen, further reducing the possibility of oxidation and rusting in the condensation part; and the filtering container 2 is sleeved outside the cooling pipeline 1, which can effectively reduce the space occupied compared with multi-stage filtration. The pre-treatment of the heating element 24 can also pre-heat the cooling pipeline 1, reducing the possibility of secondary condensation water generation after the natural gas in the cooling pipeline 1 is transported to the outside through the return pipe 11. Among them, an output pipe 25 is fixedly connected to the side of the filtering container 2 corresponding to the lower side of the partition plate 21 for use as the output end of the dehydrated natural gas.

[0039] Finally, in order to receive the condensed water, a receiving assembly 4 for accommodating the condensed water is provided at the bottom of the filtering container 2.

[0040] Refer to Figure 1 and Figure 2 At the same time, in order to replace the liquid dehydrating agent in the dehydration ring groove 231 in time, a pipeline extending out of the filtering container 2 is fixedly connected to the top of the dehydration ring groove 231, and an input valve 233 for controlling the input of the alkaline liquid dehydrating agent is installed on the part of the pipeline outside the filtering container 2. A pipeline extending out of the filtering container 2 is also fixedly connected to the bottom of the dehydration ring groove 231, and an output valve 234 for controlling the output of the alkaline liquid dehydrating agent is installed on the bottom pipeline for replacing the liquid dehydrating agent in the dehydration ring groove 231 in real time or regularly.

[0041] Of course, in other embodiments, the pipeline provided on the outer wall of the dehydration ring groove 231 can also be installed vertically, and the liquid dehydrating agent can also be replaced through the top and bottom of the filtering container 2.

[0042] Refer to Figure 1 and Figure 2, in this embodiment, since the dehydrating pipe 232 inputs natural gas into the liquid dehydrating agent, on the one hand, it will cause the liquid dehydrating agent to violently tumble, affecting the dehydration effect, and on the other hand, it will cause the natural gas to be unable to repeatedly contact the dehydrating agent for dehydration. For this reason, a number of buffer plates 235 are respectively provided on the corresponding inner and outer tank walls inside the dehydration ring groove 231 and are distributed along the axis of the cooling pipe 1. The buffer plates 235 are preferably annular, and the buffer plates 235 can be either mesh plates or solid plates. And the buffer plates 235 adjacent to each other along the axis of the cooling pipe 1 are respectively located on the opposite tank walls of the dehydration ring groove 231 and are arranged in an interlaced manner. That is, the outer ring of one of the adjacent two buffer plates 235 is fixed to the outer tank wall of the dehydration ring groove 231, the inner ring of the other of the adjacent two buffer plates 235 is fixed to the inner tank wall of the dehydration ring groove 231, and the projections of the adjacent two buffer plates 235 along the axis of the cooling pipe 1 partially overlap, so that the bubbles formed by the natural gas in the dehydration ring groove 231 can float upward in an interlaced manner and form more small bubbles through the installed buffer plates 235, so as to fully contact the liquid dehydrating agent, and at the same time, the buffer plates 235 can effectively suppress the tumbling of the liquid dehydrating agent in the dehydration ring groove 231 and optimize the stability during use.

[0043] In order to further enable the natural gas after dehydration pretreatment to fully preheat the cooling pipe 1, a number of cooling fins 12 are provided at the part of the cooling pipe 1 below the filter element 3 in the filter container 2. The cooling fins 12 are arrayed and distributed in a staggered manner on the outer wall of the cooling pipe 1. That is, the cooling fins 12 are divided into several groups and surround the cooling pipe 1, and the cooling fins 12 in the same group are distributed along the axis of the cooling pipe 1 or are spirally distributed in a circumferential direction along a spiral line with the axis of the cooling pipe 1 as the spiral center, so as to further enable the natural gas to fully contact the cooling fins 12, heat-treat the cooling pipe 1, accelerate the heat exchange between the cooling pipe 1 and the natural gas outside, and fully enable the moisture in the natural gas to cool and condense into water for secondary dehydration treatment of the natural gas.

[0044] Refer to Figure 1 and Figure 2 , specifically, the cooling fins 12 adjacent to each other along the axis of the cooling pipe 1 in the same group have opposite spiral angles in the vertical direction, so that when the natural gas is transported downward, the cooling fins 12 will guide the natural gas to flow in different directions. On the one hand, it can to a certain extent avoid the formation of a regular circumferential spiral downward flowing air flow, resulting in some natural gas being unable to contact the cooling fins 12 and the cooling pipe 1, affecting the preheating effect; on the other hand, it can also fully perform condensation dehydration treatment on the natural gas.

[0045] Refer to Figure 2 and Figure 3, in addition, in order to further ensure that the natural gas in the dehydration ring groove 231 is fully in contact with the liquid dehydrating agent and further form an irregular air flow on the periphery of the cooling pipeline 1, a plurality of flow disturbing members 5 are provided on the groove wall of the dehydration ring groove 231 for irregularly disturbing the natural gas.

[0046] The flow disturbing member 5 includes a floating plate 51 and a flow disturbing plate 52. The lower end of the floating plate 51 is rotatably connected to the groove wall on the side of the inner side of the dehydration ring groove 231 facing the cooling pipeline 1, and the flow disturbing plate 52 is rotatably connected to the outer wall on the side of the outer side of the dehydration ring groove 231 facing the cooling pipeline 1, that is, the flow disturbing plate 52 is rotatably connected to the outer wall of the innermost side of the dehydration ring 23. The rotation axes of the floating plate 51 and the flow disturbing plate 52 are coaxially arranged and horizontally intersect at the central axis of the dehydration ring 23. The rotation axis of the floating plate 51 is located at the lower part. The floating plate 51 is vertically arranged and a floating cavity 511 is formed on the inner side of the top so that the floating plate 51 can be vertically suspended in the liquid dehydrating agent; the flow disturbing plate 52 can be horizontally or obliquely arranged. The flow disturbing plate 52 and the floating plate 51 are coaxially connected by a connecting shaft 53 passing through the inner cavity wall of the dehydration ring 23, and the connecting shaft 53 is coaxially arranged with the rotation axes of the floating plate 51 and the flow disturbing plate 52 and is rotationally sealed.

[0047] Refer to Figure 2 and Figure 3 , since the natural gas output from the dehydrating pipe 232 will form bubbles in the dehydration ring groove 231 and drive the liquid dehydrating agent to churn. On the one hand, the bubbles will contact the floating plate 51, and the impact generated by the bursting of the bubbles will push the floating plate 51 to swing and form smaller bubbles. On the other hand, the churning liquid dehydrating agent will synchronously push the floating plate 51 to swing, so that the natural gas can fully contact the liquid dehydrating agent and suppress the churning of the liquid dehydrating agent. In addition, since the churning of the liquid dehydrating agent and the formation of bubbles are both irregular, the connecting shaft 53 can also drive the flow disturbing plate 52 to swing irregularly, so as to further make the natural gas flow on the periphery of the cooling fins 12 irregular, so as to further fully contact the cooling fins 12 and perform secondary condensation dehydration. Compared with the floating plate 51 being directly immersed in the liquid dehydrating agent, the existence of the floating cavity 511 can make the top of the floating plate 51 be the swinging part, which can cooperate with the churning liquid dehydrating agent, so that the inclined surface of the floating plate 51 when it is inclined can fully contact the bubbles floating from bottom to top, so as to further optimize the crushing effect on the natural gas bubbles and at the same time optimize the flow disturbing effect on the inner natural gas flow.

[0048] Refer to Figure 1 and Figure 2, specifically, in order to filter the natural gas dehydrated by the liquid dehydrating agent and facilitate timely replacement, the filter element 3 includes a plurality of filter plates 31 arranged around the cooling pipeline 1. The filter plates 31 are in an arc-shaped plate structure. The plurality of filter plates 31 are spliced with each other to form a tubular structure and sleeved on the outer wall of the top of the cooling pipeline 1. At the same time, the outer wall of the filter plate 31 fits the inner wall of the outer wall of the dehydration ring 23 and the upwardly bent part of the partition plate 21.

[0049] The filter plate 31 is inserted into the annular space between the partition plate 21 and the cooling pipeline 1 from the top of the filter container 2 towards the inside, and at least part of the top of the filter plate 31 extends out of the filter container 2. The top of the filter container 2 is detachably fixedly connected with a cover plate 20. The cover plate 20 is annular, and the outer ring is detachably fixedly connected to the outer wall of the top of the filter container 2 by bolts or the like. The inner ring of the cover plate 20 is bent upwards and fixed to the part of the cooling pipeline 1 outside the filter container 2 by bolts or a hoop. And the cover plate 20 is hermetically arranged with the filter container 2 and the cooling pipeline 1 through a sealing ring to facilitate the replacement of the filter plate 31. Of course, in order to reduce the gap between the spliced filter plates 31 and affect the filtering effect of the natural gas, the contact seam between adjacent filter plates 31 can be set as a spiral structure; and in other embodiments, the filter element 3 can also be set as a tubular structure as a whole, and an axially extending opening is provided on one side to facilitate overall disassembly and assembly.

[0050] Refer to Figure 1 and Figure 2 , finally, in order to receive the condensed water, the accommodating assembly 4 includes a condensate container 41 with an upward opening and a plurality of condensate plates 42 arranged in the condensate container 41. The upper opening edge of the condensate container 41 is fixedly connected and communicated with the bottom of the filter container 2, for example, it can be fixedly connected by means of flange connection.

[0051] The condensate plates 42 are divided into two groups and are arranged oppositely. The edges of the two groups of condensate plates 42 away from each other are respectively fixed to the inner wall of the condensate plates 42. The sides of the two groups of condensate plates 42 facing each other are inclined towards the bottom, and the two groups of condensate plates 42 are arranged in an interleaved manner to reduce the flow contact between the externally flowing air flow and the condensed water and reduce the secondary volatilization of the condensed water. At the same time, a drain valve 43 is fixedly installed at the bottom of the condensate container 41 for regular drainage.

[0052] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A filtering device for natural gas transmission, characterized in that: It comprises a cooling pipe (1) at a cooling part of a pressure drop device, a filter container (2) jacketed on the cooling pipe (1), and a filter element (3) jacketed on the top of the cooling pipe (1); The filter element (3) is covered with an annular partition plate (21), the partition plate (21) forms a reflux chamber (22) at an outer ring relative to the filter element (3), the output end of the cooling pipe (1) is connected to a reflux pipe (11) for returning the cooled natural gas to the reflux chamber (22), the reflux pipe (11) is at least partially located outside the filter container (2) and is provided with a heating element (24) for heating; A dehydration ring (23) is fixedly connected to the bottom of the partition plate (21) and is jacketed on the top of the filter element (3) and the cooling pipe (1). The dehydration ring (23) is concave to form a tubular dehydration ring groove (231). A plurality of dehydration pipes (232) are arranged in the dehydration ring groove (231) and are fixed to the partition plate (21) and connected to the reflux chamber (22). An alkaline liquid dehydrating agent is contained in the dehydration ring groove (231); At least the top portion of the outer wall of the dehydration annular groove (231) is provided with air holes and fits the outer wall of the filter element (3); a receiving assembly (4) for receiving condensed water is provided at the bottom of the filter container (2); and a natural gas output end is provided at the side of the filter container (2).

2. A filtering device for natural gas transportation according to claim 1, characterized in that: An input valve (233) extending out of the filter container (2) and used for controlling the input of an alkaline liquid dehydrating agent is provided at the top of the dehydration annular groove (231); an output valve (234) extending out of the filter container (2) and used for controlling the output of the alkaline liquid dehydrating agent is provided at the bottom of the dehydration annular groove (231).

3. A filtering device for natural gas transportation according to claim 1, characterized in that: The filter element (3) comprises a plurality of filter plates (31) arranged around the cooling pipe (1); the filter plates (31) are in the form of an arc-shaped plate structure and are fitted to the outer wall of the cooling pipe (1); the filter plates (31) are inserted from the top of the filter container (2); the inner circle of the partition plate (21) fits the outer wall of the filter plate (31); and the inner circle of the partition plate (21) extends toward the top wall of the filter container (2) and is fixed to the inner wall of the filter container (2); and a cover plate (20) for covering and sealing the protruding portion of the filter plate (31) is detachably fixed to the top of the filter container (2).

4. A filtering device for natural gas transportation according to claim 1, characterized in that: The outer wall of the cooling pipe (1) located inside the filter container (2) is provided with a plurality of cooling fins (12).

5. A filtering device for natural gas transportation according to claim 4, characterized in that: The plurality of cooling fins (12) are divided into a plurality of groups and arranged around the cooling pipe (1); the plurality of cooling fins (12) in the same group are distributed along the axial direction of the cooling pipe (1) or in the direction of a spiral line with the axial direction of the cooling pipe (1) as the spiral center.

6. A filtering device for natural gas transportation according to claim 1, characterized in that: The groove walls corresponding to the inner and outer sides of the dehydration annular groove (231) are respectively provided with a plurality of buffer plates (235) distributed along the axial direction of the cooling pipe (1), and the buffer plates (235) adjacent to each other along the axial direction of the cooling pipe (1) are respectively located on the groove walls opposite to each other of the dehydration annular groove (231) and are arranged in an interlaced manner.

7. A filtering device for natural gas transportation according to any one of claims 1 to 6, characterized in that: The groove wall of the dehydration annular groove (231) is provided with a plurality of flow-interrupting members (5), the flow-interrupting members (5) comprising a floating plate (51) rotatably arranged on the inner wall of the dehydration annular groove (231) and a flow-interrupting member (52) rotatably arranged on the inner side of the dehydration ring (23) corresponding to the peripheral position of the cooling pipe (1), the rotation center of the flow-interrupting member (52) being coaxially connected to the rotation center of the floating plate (51) via a connecting shaft (53), and the floating plate (51) being floatingly arranged in the dehydration annular groove (231).

8. A filtering device for natural gas transportation according to claim 7, characterized in that: The floating plate (51) is arranged along the central axis direction of the dehydration ring groove (231) and a floating cavity (511) is provided on the top. The thickness of the floating plate (51) decreases gradually from top to bottom.

9. A filtering device for natural gas transportation according to any one of claims 1 to 6, characterized in that: The containing assembly (4) comprises a condensing container (41) with an upper opening and a plurality of condensing plates (42) arranged in the condensing container (41); the upper opening edge of the condensing container (41) is fixed to and connected to the bottom of the filtering container (2); the condensing plates (42) are divided into two groups and the two groups are arranged opposite to each other; the edges of the two groups of condensing plates (42) on one side away from each other are fixed to the inner wall of the condensing plates (42); the two groups of condensing plates (42) are arranged to be inclined toward the bottom on one side, and the two groups of condensing plates (42) are arranged in an interlaced manner; and a drain valve (43) for regular drainage is provided at the bottom of the condensing container (41).

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