Combined pigging receiving device

Abstract

The utility model relates to the field of pipeline cleaning, in particular to a combined pigging receiving device. According to the combined pigging receiving device, a gas inlet pipeline and a ball receiving barrel which are connected in series, a pipeline between the ball receiving barrel and a separator and the separator form a separation pipeline, and a gas collecting pipeline is connected to the position, located on the upstream of the separator, of the separation pipeline; a three-way valve is arranged at the intersection of the gas collection pipeline and the separation pipeline, or a first valve is arranged on the gas collection pipeline, and a second valve is arranged on the separation pipeline and at the downstream of the intersection of the separation pipeline and the gas collection pipeline. By arranging the gas collecting pipeline, natural gas can be conveniently and directly conveyed out through the gas collecting pipeline, that is, the natural gas in the gas inlet pipeline is directly conveyed without passing through the separator, and therefore the problem that in the prior art, in the pipe cleaning process, natural gas pushed out from the ball sending barrel to the ball receiving barrel of a cleaning ball needs to be separated through the separator, and the separation efficiency is high is solved. And the problem that the cleaning burden of the separator is heavy due to the fact that the natural gas at the beginning of pipe cleaning does not need to be separated is solved.

Description

Technical Field

[0001] The utility model relates to the field of pipeline cleaning, in particular to a combined pipeline cleaning receiving device. Background Art

[0002] During the natural gas pipeline transportation process, as the service life increases, condensate will be generated inside the pipeline. The condensate will gradually form impurities that adhere to the inside of the pipeline. These condensate and impurities will reduce the effective cross-sectional area of ​​the pipeline and affect the pipeline's transportation efficiency. Therefore, regular cleaning is required.

[0003] In the prior art, cleaning of natural gas pipelines often uses cleaning balls to scrape inside the pipeline. Specifically, a cleaning ball that is interference fit with the inner wall of the pipeline is placed in the pipeline, and the cleaning ball scrapes against the inner wall of the pipeline when one side is pressurized. The natural gas pushed out during the movement of the cleaning ball will contain condensate and oil. This part of the natural gas does not meet the use standards and cannot be directly used, and is often treated by combustion. Of course, there are also treatment methods in the prior art to collect natural gas to avoid waste. For example, the Chinese utility model patent with authorization announcement number CN211118784U discloses an EHS system and operation method for sending and receiving balls for urban gas cleaning pipes, which discloses the use of cleaning balls for cleaning natural gas pipelines. In order to save natural gas, a filter separator (i.e., separator) is provided, so that the pipeline is connected to the separator and the natural gas pushed out by the cleaning ball is separated and processed through the separator, so that the natural gas meets the use standards and is reused.

[0004] However, in the process of using cleaning balls for cleaning, the cleaning balls travel a long distance from the ball-issuing barrel to the ball-receiving barrel, and the amount of natural gas discharged will also be large. The natural gas discharged in the early stage of the use of the cleaning balls is relatively clean and meets the use standards. However, at this time, all the natural gas will pass through the separator, causing the problem of a large cleaning load on the separator. Utility Model Content

[0005] The utility model aims to provide a combined cleaning receiving device for solving the problem in the prior art that in the cleaning process, the natural gas pushed out by the cleaning ball from the ball launching cylinder to the ball receiving cylinder needs to be separated and processed by a separator, while the natural gas at the beginning of the cleaning does not need to be separated and processed, resulting in a heavy cleaning burden on the separator.

[0006] In order to achieve the above purpose, the combined pigging receiving device in the utility model adopts the following technical solutions:

[0007] A combined pipe cleaning receiving device comprises a ball collecting cylinder and an air intake pipeline connected to the upstream of the ball collecting cylinder, a separator for separating the received gas-liquid mixture is arranged in series downstream of the ball collecting cylinder, the air intake pipeline, the ball collecting cylinder, the pipeline between the ball collecting cylinder and the separator and the separator arranged in series constitute a separation pipeline, a gas collecting pipeline is connected to the separation pipeline upstream of the separator, and the gas collecting pipeline is used to transport the clean natural gas in the separation pipeline to the next process for use; a three-way valve is arranged at the intersection of the gas collecting pipeline and the separation pipeline, or a first valve is arranged on the gas collecting pipeline, and a second valve is arranged on the separation pipeline downstream of the intersection of the separation pipeline and the gas collecting pipeline.

[0008] The beneficial effect of the above technical solution is that the utility model improves the existing combined pipe cleaning receiving device, and a gas collecting pipeline is connected to the separation pipeline, which is convenient for natural gas to be directly transmitted to the outside through the air intake pipeline, that is, the natural gas can be directly transmitted to the external transmission pipeline for use without passing through the separator, and the flow direction of the natural gas in the air intake pipeline can be selected by using a three-way valve or a first valve and a second valve, that is, the natural gas passing through the ball receiving cylinder will utilize the cleaning ability of the separator, while the natural gas directly passing through the gas collecting pipe does not need to pass through the separator, which is convenient for direct transportation without passing through the separator when the cleaning ball is far away and the natural gas has not been contaminated by the condensate or the contamination is relatively small, thereby reducing the burden on the separator, thereby solving the problem in the prior art that in the pipe cleaning process, the natural gas pushed out by the cleaning ball from the ball launching cylinder to the ball receiving cylinder needs to be separated and processed by the separator, while the natural gas at the beginning of the pipe cleaning does not need to be separated and processed, resulting in a heavy cleaning burden on the separator.

[0009] Furthermore, there are at least two ball collecting barrels, and the gas collecting pipelines and the ball collecting barrels are arranged in a one-to-one correspondence. The combined cleaning receiving device also includes a transition pipeline, and the transition pipeline is connected to each gas collecting pipeline.

[0010] The beneficial effects of the above technical solution are: it is easy to save the use of pipelines, and the use of transition pipelines reduces the total length of the intake pipeline.

[0011] Furthermore, the gas gathering pipeline is connected to the gas intake pipeline, and the combined cleaning receiving device also includes an external transmission pipeline for collecting and reusing clean natural gas and connected to the gas gathering pipeline. The ball collecting cylinder is provided with a first exhaust port, and the first exhaust port is connected to a first exhaust pipeline, the first exhaust pipeline is connected to a transition pipeline, and the transition pipeline is connected to a separator. A third valve is provided on the first exhaust pipeline, a fourth valve is provided between the separator and the transition pipeline, and a fifth valve is also provided on the external transmission pipeline.

[0012] The beneficial effects of the above technical solution are: the transition pipeline can also be used to transport the natural gas that needs to be processed, further saving the total length of the pipeline, and the setting of three valves prevents the problem of gas leakage during use; at the same time, the setting of the transition pipeline allows multiple ball collecting tubes and multiple air intake pipelines to be interconnected, so that multiple air intake pipelines can share the same set of separators, saving the number of separators used.

[0013] Furthermore, at least two separators are provided, and the plurality of separators are arranged in parallel, each separator is connected to a second exhaust pipe, each second exhaust pipe is connected to a transition pipe, and each second exhaust pipe is provided with the fourth valve.

[0014] The beneficial effects of the above technical solution are: further utilizing the transition pipeline, thereby improving the utilization rate of the transition pipeline and saving the installation length of the pipeline; and facilitating the individual control of each separator through the installation of the fourth valve.

[0015] Furthermore, the combined cleaning receiving device also includes an exhaust transition pipe connected to each second exhaust pipe, and the exhaust transition pipe is communicated with the transition pipe.

[0016] The beneficial effects of the above technical solution are: saving the setting of pipelines and saving the length of the exhaust part by setting the exhaust transition pipe.

[0017] Furthermore, each separator is provided with a second exhaust port, each second exhaust port is connected to an exhaust branch pipe, and each exhaust branch pipe is connected to an external transmission pipeline through an exhaust main pipe.

[0018] The beneficial effects of the above technical solution are: the exhaust main pipe can save the length of the pipeline and the degree of integration is high.

[0019] Furthermore, there are at least two separators, and the plurality of separators are arranged in parallel.

[0020] The beneficial effects of the above technical solution are: increasing the separation capacity, so that the overall separation capacity is enhanced; and the two separators arranged in parallel can be used alternately, so that the separators can work alternately.

[0021] Furthermore, a first sewage pipe is arranged on the ball collecting cylinder, and a second sewage pipe is arranged at the liquid outlet of the separator, and both the first sewage pipe and the second sewage pipe are connected to the liquid storage tank.

[0022] The beneficial effect of the above technical solution is that it is convenient to discharge sewage at any time, the first sewage discharge is carried out in the ball collecting cylinder, and the second sewage discharge is carried out on the separator.

[0023] Furthermore, at least two liquid storage tanks are provided, the first sewage pipe and the second sewage pipe are both connected to the sewage main pipe, and each liquid storage tank is connected to the sewage main pipe through a sewage branch pipe.

[0024] The beneficial effect of the above technical solution is to enhance the liquid storage capacity of the liquid storage tank.

[0025] Furthermore, each sewage branch pipe is provided with a sixth valve.

[0026] The beneficial effect of the above technical solution is that: multiple liquid storage tanks can be used in turn, so when one of them is full, it can be replaced by another liquid storage tank while the full liquid storage tank is cleaned at the other end. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the pipeline arrangement of Example 1 of the combined pigging receiving device in the utility model.

[0028] In the figure: 1. ball collecting cylinder; 2. separator; 3. liquid storage tank; 41. air intake pipe; 42. transition pipe; 43. external transmission pipe; 44. first exhaust pipe; 45. second exhaust pipe; 46. exhaust transition pipe; 47. exhaust branch pipe; 48. exhaust main pipe; 51. first sewage pipe; 52. second sewage pipe; 53. sewage main pipe; 54. sewage branch pipe; 6. vent pipe; 71. first valve; 72. second valve; 73. third valve; 74. fourth valve; 75. fifth valve; 76. sixth valve. DETAILED DESCRIPTION

[0029] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0030] In the embodiment 1 of the combined pigging receiving device of the utility model:

[0031] In this embodiment, the combined cleaning receiving device includes a ball collecting cylinder, a separator located downstream of the ball collecting cylinder, and a gas collecting pipeline located upstream of the ball collecting cylinder. When the cleaning ball moves in the air intake pipeline, the cleaning ball will push the natural gas and condensate in the air intake pipeline to move due to the interference fit between the cleaning ball and the air intake pipeline, and the natural gas and condensate move downstream with the cleaning ball. After that, the natural gas is collected by the separator through the gas collecting pipeline, and then this part of the natural gas is reused. Since the natural gas is relatively clean at the beginning of the cleaning, it can be directly transported through the gas collecting pipeline for reuse.

[0032] Specifically, Figure 1As shown, the combined cleaning receiving device in this embodiment includes a ball collecting cylinder 1 and an air intake pipe connected to the ball collecting cylinder 1. The air intake pipe 41 is both a pipe that needs to be cleaned and a pipe from which the cleaning balls come. A separator 2 is arranged in series downstream of the ball collecting cylinder 1. The separator 2 is used to separate the gas-liquid mixture received from the air intake pipe 41. After separation, the gaseous substance and the liquid substance are distinguished. Naturally, the separator 2 includes a gas outlet and a liquid outlet. The gas outlet is used to connect to the external transmission pipe 43, and the liquid outlet is used to connect to the sewage pipe. Among them, the air intake pipe, the ball collecting cylinder, the pipeline between the ball collecting cylinder and the separator arranged in series, and the separator constitute a separation pipeline. In order to collect liquid substances, a liquid storage tank 3 for collecting condensate is also provided. In order to facilitate the use of natural gas, an external transmission pipeline 43 is also provided. The external transmission pipeline 43 is used to transport the natural gas back to the subsequent process for reuse.

[0033] All substances entering the separator 2 must be separated into gas and liquid, that is, they will occupy the separation capacity of the separator 2. At the beginning of the cleaning, the natural gas is relatively pure, so a gas collection pipeline is also provided upstream of the separator on the separation pipeline, which is connected to the gas intake pipeline and to the external transmission pipeline 43. The gas collection pipeline is provided with a first valve 71. The gas collection pipeline is connected to the external transmission pipeline 43. At the beginning of the cleaning, the gas collection pipeline is used to directly collect and reuse the natural gas in the pipeline.

[0034] In this embodiment, there are three ball collecting cylinders 1, each of which corresponds to a gas collecting pipeline. A transition pipeline 42 is provided between the gas collecting pipeline and the external transmission pipeline 43, and the transition pipeline 42 connects the gas collecting pipeline and the external transmission pipeline 43. At the same time, a first exhaust port is provided on the ball collecting cylinder 1, and a first exhaust pipeline 44 is connected to the first exhaust port. The first exhaust pipeline 44 is connected to the transition pipeline 42. The gas discharged from the ball collecting cylinder 1 needs to pass through the separator 2 for gas-liquid separation, so the transition pipeline 42 is also connected to the separator 2. A third valve 73 is provided on the first exhaust pipeline 44, and a fourth valve 74 is provided between the separator 2 and the transition pipeline 42. A fifth valve 75 is also provided on the external transmission pipeline 43. Closing the fifth valve 75 can make the transition pipeline 42 only be separated from the separator 2. The transition pipeline can not only directly supply exhaust to the gas gathering pipeline, but also transport the natural gas that needs to be processed, further saving the total length of the pipeline. The setting of three valves prevents the problem of gas chaos during use. At the same time, the setting of the transition pipeline allows multiple ball collecting tubes and multiple air intake pipelines to be interconnected, so that multiple air intake pipelines can share the same set of separators and liquid storage tanks, saving the number of separators and liquid storage tanks used. During use, the same set of separators can be used for different air intake pipelines by switching the valves.

[0035] There are two separators 2, which are arranged in parallel downstream of the ball receiving cylinder 1. The combined cleaning receiving device also includes an exhaust transition pipe 46 and a second exhaust pipe 45 located between the exhaust transition pipe 46 and the separator 2. The second exhaust pipe 45 corresponds to the separator 2 one by one, and the fourth valve 74 is arranged on the second exhaust pipe 45. The separator 2 is provided with a second exhaust port, and the second exhaust port is connected to an exhaust branch pipe 47. The exhaust branch pipe 47 is connected to the external transmission pipeline 43 through an exhaust main pipe 48. Since the cleaning ball runs at a high speed during the cleaning process, the separator 2 needs to have a higher separation capacity. By setting a plurality of separators 2, the separator 2 can be controlled. If the separation capacity of a single separator 2 is sufficient, only one of the separators 2 can be used; if the separation capacity of a single separator 2 is insufficient, the two separators 2 can be used alternately; of course, in other feasible ways, the third valve 73 can also be opened at the same time to use two separators 2 at the same time. The gas outlet of the separator 2 is connected to the external transmission pipeline 43 to facilitate the reuse of natural gas, and the liquid outlet of the separator 2 is used to connect to the sewage pipeline, through which the condensate is transported to the liquid storage tank 3 for unified treatment.

[0036] In this embodiment, three liquid storage tanks 3 are provided. The size of a single liquid storage tank 3 is limited, and a larger liquid storage tank 3 is not easy to transport during transportation. Therefore, three liquid storage tanks 3 are used to store waste liquid. The three liquid storage tanks 3 are arranged in parallel. The liquid storage tank 3 has a liquid inlet and a liquid outlet. The liquid inlet is used to collect waste liquid, and the liquid outlet is used to discharge the waste liquid in the liquid storage tank 3. The liquid inlet is used to connect the ball collecting cylinder 1 and the separator 2, respectively, and can receive the waste liquid in the ball collecting cylinder 1 and the separator 2, respectively. A first sewage discharge pipe 51 is provided on the ball collecting cylinder 1, and a second sewage discharge pipe 52 is provided on the liquid outlet on the separator 2. The first sewage discharge pipe 51 and the second sewage discharge pipe 52 are both connected to the sewage main pipe 53, and the liquid storage tank 3 is connected to the sewage main pipe 53 through a sewage branch pipe 54. At least two liquid storage tanks 3 are provided, and the first sewage discharge pipe 51 and the second sewage discharge pipe 52 are both connected to the sewage main pipe 53. The liquid storage tank 3 is connected to the sewage main pipe 53 through a sewage branch pipe 54. In order to facilitate the installation of the liquid storage tank 3 used, a sixth valve 76 is also provided on the sewage branch pipe 54 .

[0037] In addition, during the use of the natural gas pipeline, it is necessary to control the pressure limit value inside the pipeline to prevent the natural gas pipeline from bursting. Therefore, the natural gas pipeline is also provided with a vent pipe 6 and a vent torch. In this embodiment, the vent pipe 6 is respectively connected to the ball collecting cylinder 1, the separator 2 and the liquid storage tank 3 to avoid damage caused by excessive pressure in a certain component.

[0038] When cleaning is required, first close the second valve 72, the third valve 73 and the fourth valve 74, open the first valve 71 and the fifth valve 75. At this time, the cleaning is in the initial stage, and the natural gas in the intake pipeline 41 passes through the intake pipeline 41, the gas collection pipeline and the transition pipeline 42 to enter the external transmission pipeline 43 for use. With the operation of the cleaning ball, the pollution degree of the natural gas in the intake pipeline 41 will increase, and it cannot be used directly. At this time, close the first valve 71 and the fifth valve 75, open the second valve 72 and the third valve 73, and open the fourth valve 74 as needed. At this time, the natural gas in the intake pipe enters the transition pipeline 42 through the ball collecting cylinder 1 and the first exhaust pipeline 44, and then enters the separator 2. After the separation effect of the separator 2, it enters the external transmission pipeline 43 through the exhaust branch pipe 47 and the exhaust main pipe 48 at the second exhaust port. It is worth noting that the separation capacity required during the cleaning process is determined by the running speed of the cleaning ball. If a larger cleaning capacity is required, the two fourth valves 74 are opened at the same time; if the cleaning capacity is sufficient, one of the fourth valves 74 is selectively opened or the two fourth valves 74 are opened successively.

[0039] As the separator 2 is used, the waste liquid discharged from the separator 2 needs to be collected. At this time, one of the sixth valves 76 can be selectively opened to store the waste liquid in one of the liquid storage tanks 3. When the liquid storage tank 3 is full, the sixth valve 76 is closed and another sixth valve 76 is opened to store liquid in another liquid storage tank 3.

[0040] In Example 2 of the combined pipe cleaning receiving device in the utility model: Regarding the setting of the liquid storage tank, this embodiment proposes a new arrangement form. Different from Example 1, in this embodiment, a sixth valve is no longer set between the liquid storage tank and the sewage main pipe, but multiple liquid storage tanks are used at the same time.

[0041] In Example 3 of the combined pipe cleaning receiving device of the utility model: Regarding the setting of the liquid storage tank, this embodiment proposes a new arrangement form. Different from Example 1, in this embodiment, a sewage branch pipe is no longer set, and each liquid storage tank has a separate pipe connecting the first sewage pipe and the second sewage pipe.

[0042] In the embodiment 4 of the combined pigging receiving device of the utility model: for the setting of the liquid storage tank, this embodiment proposes a new arrangement form. Different from the embodiment 1, the liquid storage tanks in this embodiment are provided with two, four or other numbers greater than two. Of course, in other embodiments, only one liquid storage tank may be provided.

[0043] In Example 5 of the combined pipe cleaning receiving device in the utility model: Regarding the setting of the combined pipe cleaning receiving device, this embodiment proposes a new layout form. Different from Example 1, in this embodiment, a liquid storage tank is no longer set. When the waste liquid needs to be discharged, a vehicle is used to directly receive the waste liquid.

[0044] In Example 6 of the combined pipe cleaning receiving device in the utility model: Regarding the setting of the combined pipe cleaning receiving device, this embodiment proposes a new arrangement form. Different from Example 1, in this embodiment, no exhaust branch pipe is provided on the separator, but an exhaust main pipe is provided on each separator, which is connected to the external transmission pipeline through the exhaust main pipe.

[0045] In Example 7 of the combined pipe cleaning receiving device in the utility model: Regarding the setting of the combined pipe cleaning receiving device, this embodiment proposes a new arrangement form. Different from Example 1, in this embodiment, only one fourth valve is provided, and the other separator can only be connected to the exhaust transition pipe, and the separator with the fourth valve can be selectively connected.

[0046] In the embodiment 8 of the combined pig receiving device of the utility model: with respect to the number of separators, this embodiment proposes a new arrangement form. Different from the embodiment 1, the separators in this embodiment are arranged in three, four or other numbers greater than two. Of course, in other embodiments, only one separator may be arranged.

[0047] In Example 9 of the combined pipe cleaning receiving device in the utility model: Regarding the setting of the combined pipe cleaning receiving device, this example proposes a new arrangement form. Different from Example 1, in this example, the gas collecting pipe and the ball collecting cylinder are no longer connected through the first exhaust pipe, and the first exhaust pipe on the ball collecting cylinder is separately arranged from the gas collecting pipe.

[0048] In Example 10 of the combined pipe cleaning receiving device of the utility model: Regarding the setting of the ball receiving cylinder, this embodiment proposes a new arrangement form. Different from Example 1, in this embodiment, two, four or other numbers greater than one of the ball receiving cylinders are provided. Of course, in other embodiments, only one ball receiving cylinder may be provided.

[0049] In Example 11 of the combined cleaning receiving device of the utility model: With respect to the setting of the gas collection pipeline and the separation pipeline, this embodiment proposes a new arrangement form. Different from Example 1, in this embodiment, the gas collection pipeline no longer intersects with the air intake pipeline, and the gas collection pipeline is arranged on the ball collecting cylinder. Of course, in other embodiments, the gas collection pipeline can also intersect with the pipeline between the ball collecting cylinder and the separator. With respect to different intersection positions, the second valve can also be arranged at different setting positions, such as being arranged on the pipeline between the ball collecting cylinder and the separator.

[0050] In Example 12 of the combined pipe cleaning receiving device of the utility model: Regarding the setting of the valve, this embodiment proposes a new arrangement form. Different from Example 1, in this embodiment, the first valve and the second valve are no longer set, but a three-way valve is set at the intersection of the separation pipelines of the gas collection pipeline.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A combined pigging receiving device, comprising a ball collecting cylinder and an air intake pipe connected to the upstream of the ball collecting cylinder, a separator for separating the received gas-liquid mixture is arranged in series downstream of the ball collecting cylinder, and the air intake pipe, the ball collecting cylinder, the pipe between the ball collecting cylinder and the separator and the separator arranged in series constitute a separation pipeline, characterized in that: A gas gathering pipeline is connected to the separation pipeline upstream of the separator, and the gas gathering pipeline is used to transport the clean natural gas in the separation pipeline to the next process for use; a three-way valve is provided at the intersection of the gas gathering pipeline and the separation pipeline, or a first valve is provided on the gas gathering pipeline, and a second valve is provided on the separation pipeline downstream of the intersection of the separation pipeline and the gas gathering pipeline.

2. The combined pigging receiving device according to claim 1 is characterized in that: There are at least two ball collecting barrels, and the gas collecting pipelines and the ball collecting barrels are arranged in a one-to-one correspondence. The combined cleaning receiving device also includes a transition pipeline, which is connected to each gas collecting pipeline.

3. The combined pigging receiving device according to claim 2 is characterized in that: The gas collecting pipeline is connected to the gas intake pipeline. The combined cleaning receiving device also includes an external transmission pipeline for collecting and reusing clean natural gas and connected to the gas collecting pipeline. The ball collecting cylinder is provided with a first exhaust port, and the first exhaust port is connected to a first exhaust pipeline, which is connected to a transition pipeline, which is connected to a separator, a third valve is provided on the first exhaust pipeline, a fourth valve is provided between the separator and the transition pipeline, and a fifth valve is also provided on the external transmission pipeline.

4. The combined pigging receiving device according to claim 3 is characterized in that: At least two separators are provided, and the plurality of separators are arranged in parallel. Each separator is connected to a second exhaust pipe, each second exhaust pipe is connected to a transition pipe, and each second exhaust pipe is provided with the fourth valve.

5. The combined pigging receiving device according to claim 4 is characterized in that: The combined pigging receiving device also includes an exhaust transition pipe connected to each second exhaust pipe, and the exhaust transition pipe is communicated with the transition pipe.

6. The combined pigging receiving device according to claim 4 or 5, characterized in that: Each separator is provided with a second exhaust port, each second exhaust port is connected with an exhaust branch pipe, and each exhaust branch pipe is connected with an external transmission pipeline through an exhaust main pipe.

7. The combined pigging receiving device according to claim 1 or 2, characterized in that: There are at least two separators, and a plurality of separators are arranged in parallel.

8. The combined pigging receiving device according to any one of claims 1 to 5, characterized in that: The ball collecting cylinder is provided with a first sewage pipe, the liquid outlet of the separator is provided with a second sewage pipe, and both the first sewage pipe and the second sewage pipe are connected to the liquid storage tank.

9. The combined pigging receiving device according to claim 8, characterized in that: At least two liquid storage tanks are provided, the first sewage pipe and the second sewage pipe are both connected to the sewage main pipe, and each liquid storage tank is connected to the sewage main pipe through a sewage branch pipe.

10. The combined pigging receiving device according to claim 9, characterized in that: A sixth valve is provided on each sewage branch pipe.

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