Water sample front buffer device and production sewage on-line monitoring system

Abstract

The utility model relates to the technical field of water sample analysis, in particular to a water sample front buffer device and a production sewage on-line monitoring system, which comprise a buffer tank, an exhaust pipe, an inlet pipe, an outlet pipe and a blow-off pipe, the inlet pipe and the outlet pipe are both arranged at the side part of the buffer tank, the blow-off pipe is arranged at the bottom of the buffer tank, and the exhaust pipe is arranged at the bottom of the buffer tank. The exhaust pipe is arranged at the top of the buffer tank, and the buffer tank is of a funnel-shaped structure. Through the arrangement of the buffer tank, the exhaust pipe and the blow-off pipe, a buffer space for absorbing pressure fluctuation of a water sample is provided, solids and dissolved gas in the water sample are reduced, the service life of subsequent water sample detection equipment is prolonged, and the detection accuracy of the subsequent water sample detection equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water sample analysis, and more specifically, to a water sample pre-buffer device and an online production wastewater monitoring system. Background Art

[0002] The production process of offshore gas fields is accompanied by the generation of produced wastewater. The oil content of produced wastewater is an important indicator for measuring the treatment effect. With the development of digitalization and intelligentization, the online analyzer for oil content in produced wastewater is replacing traditional manual analysis methods and becoming an important environmental monitoring equipment. It uses the principle of ultraviolet fluorescence to analyze the oil content of produced water, can achieve a response time of seconds, and monitor the oil content in gas field produced wastewater discharge in real time, which can significantly reduce the labor cost of production water sampling and testing.

[0003] The online production wastewater monitoring system consists of two major components: an analysis system and an automatic cleaning device. The automatic cleaning device is mounted on a bracket and works in conjunction with the analysis system. It consists of a pneumatic valve, solenoid valve, timer, cleaning fluid, and piping. After the analysis system has been operating for a period of time, the automatic cleaning system will clean it, forming a cycle. The main cleaning targets are oil stains attached to the pipelines and probes. This enables automatic cleaning and maintenance of the oil-in-water analyzer probe, enhancing automatic maintenance and improving analysis reliability. The online production wastewater monitoring system is also equipped with a purge port to regularly introduce circulating water or high-pressure instrument air to purge the pipelines.

[0004] However, after a period of use, the system may experience a series of problems, such as numerical deviation, decreased measurement accuracy, and damage to equipment components. The main reasons are as follows:

[0005] (1) Valve erosion caused by excessive pressure difference: The system water sampling point comes from the production water coalescing separator. The normal production pressure is about 3000 kPa, and the flow pressure required by the online analysis device is about 103 kPa. The pressure regulation is achieved by setting a pressure reducing valve at the inlet of the device. Due to the large pressure difference, the pressure reducing valve is easily damaged by long-term erosion, resulting in large fluctuations in sample flow and affecting the measurement accuracy.

[0006] (2) The water sample reverses and enters the solenoid valve, damaging the valve: Due to erosion of the pressure reducing valve, the pressure of the sample pipeline cannot be regulated, causing the pressure of the downstream pipeline to rise, exceeding the instrument air inlet pressure. The high-pressure water sample in the downstream sample pipeline reverses and enters the instrument air pipeline, and enters the solenoid valve through the instrument air pressure reducing valve.

[0007] (3) Dissolved gas precipitation after decompression affects instrument analysis: The above-mentioned water sample is produced water generated during the natural gas system processing process. A small amount of natural gas is dissolved in the produced water. During the decompression process, the dissolved gas flashes out from the water phase and flows with the water sample in the analytical instrument process in the form of bubbles. The presence of bubbles interferes with the analytical probe, resulting in a decrease in measurement accuracy.

[0008] (4) Solid impurities in the production water source clog the analysis pipeline: Production water comes from formation water, which inevitably carries a small amount of solid particles. At the same time, rust, precipitation and other products are also produced in the oil, gas and water separation equipment of the system. Some solid matter enters the analysis pipeline together, clogging the originally small internal pipe system, or attaching to the optical fiber probe, causing analysis errors.

[0009] Therefore, a device is needed that can buffer the water pressure erosion suffered by the water sample system and filter impurities to improve the life and accuracy of the water sample detection system. Utility Model Content

[0010] The purpose of this utility model is to overcome the deficiency of the water sample detection circuit in the prior art that is susceptible to interference, and to provide a water sample pre-buffer device and an online production wastewater monitoring system, which is conducive to improving the life of the water sample detection system.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0012] A water sample pre-buffer device is provided, comprising a buffer tank, an exhaust pipe, an inlet pipe, an outlet pipe and a sewage pipe. The inlet pipe and the outlet pipe are both arranged on the side of the buffer tank, the sewage pipe is arranged at the bottom of the buffer tank, and the exhaust pipe is arranged at the top of the buffer tank. The buffer tank is a funnel-shaped structure.

[0013] Through this setting, the water sample pre-buffer device is connected to the sampling point of the water sample system, and the water sample enters the buffer tank from the inlet pipe. The space is increased, which is conducive to absorbing the pressure fluctuation of the water sample and alleviating the impact on the subsequent pipeline. After the water sample accumulates in the funnel, the solid particles in the water sample sink to the bottom of the buffer tank during the accumulation of the water sample, and move along the funnel-shaped buffer tank to the drain pipe for accumulation; the natural gas dissolved in the water sample will also float up during the accumulation of the water sample and be discharged from the exhaust pipe; as the water sample accumulates, the liquid level in the buffer tank rises to the outlet pipe, and the clean water sample on the upper layer flows out from the outlet pipe. The water sample that has completed the pre-treatment enters the subsequent analysis pipeline.

[0014] Preferably, an overflow pipe is further included, wherein the overflow pipe is located above the outlet pipe and is connected to the buffer tank.

[0015] With this setting, when the flow at the inlet pipe is too large, causing the water level in the buffer tank to be too high and exceeding the outlet pipe, the excess water sample can flow out from the overflow pipe to prevent the water level from rising to the exhaust pipe, thereby avoiding affecting the exhaust effect or even causing leakage.

[0016] Preferably, the exhaust pipe is further provided with a mist catcher, and the mist catcher is located in the middle of the exhaust pipe.

[0017] When the water sample in the buffer tank flashes out gas, the gas may separate from the water sample in the form of bubbles, foam, etc. Through this setting, the mist collector will intercept the bubbles, foam, etc. and make them burst. The gas inside the bubbles will continue to be discharged along the exhaust pipe, and the liquid in the bubbles will drip back into the buffer tank, which can prevent the bubbles from blocking the exhaust pipe and avoid liquid leakage caused by the liquid contained in the bubbles being discharged from the exhaust pipe.

[0018] Preferably, a gooseneck structure is further provided at the end of the exhaust pipe, and the gooseneck opening is arranged downward.

[0019] This setting method not only does not affect the exhaust effect of the exhaust pipe itself, but also prevents external water samples from entering the buffer tank along the exhaust pipe, thereby avoiding contamination of the water samples. It is beneficial to ensure the singleness of the water samples and improve the accuracy of subsequent water sample testing.

[0020] Preferably, the buffer tank has a cone structure, and the inlet pipe and the outlet pipe are respectively arranged on two opposite sides of the buffer tank.

[0021] This setting method is conducive to ensuring that the water sample has a single flow direction after entering the buffer tank, avoiding the formation of vortexes in the buffer tank that disturb the bottom sediment, and is conducive to improving the separation effect of impurities in the water sample in the buffer tank and improving the cleanliness of the water sample.

[0022] Preferably, the device further comprises a pressure reducing valve, which is arranged at the end of the inlet pipe away from the buffer tank.

[0023] Through this setting, the pressure reducing valve is placed in front, so that the water sample pre-buffer device can fully absorb the erosion effect caused by the pressure reducing valve. The pressure fluctuation of the inlet pipe of the buffer device will not be transmitted to the outlet pipe. The fluid driving force at the outlet pipe comes from the gravity generated by the liquid height difference and is only related to the physical height of the buffer device.

[0024] Preferably, a grid is further provided in the buffer tank, and the grid is provided at the connection point between the outlet pipe and the buffer tank.

[0025] Through this arrangement, the grid can further intercept some solid objects, preventing the solid objects from being carried away by the water sample and discharged from the outlet pipe due to inertia.

[0026] Preferably, the sewage pipe includes a first ball valve, a sewage pipe and a second ball valve connected in sequence, the first ball valve is installed at the bottom of the buffer tank, the first ball valve is used to control the connection state between the sewage pipe and the buffer tank, and the second ball valve is used to control the connection state between the sewage pipe and the outside.

[0027] Through the setting mode, when the water sample analysis line is in the analysis state, the water sample needs to be continuously provided, the first ball valve is opened and the second ball valve is closed, the water sample deposited in the buffer tank slides along the conical bottom surface to the pollution-accepting pipe; when the water sample analysis line is in the cleaning state, the water sample does not need to be continuously provided at this time, the water inlet pipe stops water inlet, the first ball valve is closed first and the second ball valve is opened second, so that the deposit in the pollution-accepting pipe is discharged and the water sample in the buffer tank is not affected, when the pollution discharge is completed, the second ball valve is closed again and the first ball valve is opened, the water sample pre-buffering device can restore normal work.

[0028] Preferably, the buffer tank is further provided with a top cover, the top cover is arranged on the top of the buffer tank and detachably connected with the buffer tank, and the exhaust pipe is arranged on the top cover.

[0029] Through the setting mode, the user can open the top cover of the buffer tank, clean and maintain the inside of the buffer tank from the top, and the convenience in the maintenance process of the water sample pre-buffering device is improved.

[0030] Preferably, the buffer tank is further provided with an observation window, and the observation window is arranged on the side wall of the buffer tank.

[0031] Through the setting mode, the user can observe the water sample state in the buffer tank in real time through the observation window, abnormal working conditions such as blockage, excessive deposit or excessive liquid level in the water sample buffer tank can be found in time, and the buffer tank can be maintained, and the practicability of the water sample buffering device is improved.

[0032] A production sewage on-line monitoring system, comprising a sampling port, a water sample pre-buffering device as claimed in any one of the preceding claims, an instrument air circuit, a cleaning liquid circuit and an analysis cabinet arranged in sequence, the sampling port, the water sample pre-buffering device and the analysis cabinet are communicated in sequence, a second ball valve is arranged between the sampling port and the water sample pre-buffering device, the instrument air circuit and the cleaning liquid circuit are arranged between the water sample pre-buffering device and the analysis cabinet through two control valves respectively, and a liquid discharge branch is further arranged between the analysis cabinet and the cleaning liquid circuit.

[0033] Through the setting mode, when the water sample is detected, the second ball valve is opened, the water sample in the sampling port enters the analysis cabinet through the water sample pre-buffering device, at this time, the control valves are all in the closed state, the instrument air circuit and the cleaning liquid circuit are not communicated with the water sample pre-buffering device, the water sample pre-buffering device stabilizes the water sample pressure, and the water sample pressure is prevented from increasing and flowing back into the instrument air circuit; when the water circuit is cleaned, the second ball valve is closed, the control valves are opened and closed in sequence, the instrument air circuit and the cleaning liquid circuit clean the pipelines respectively, and finally the cleaning liquid is discharged through the liquid discharge branch.

[0034] Compared with the prior art, the water sample pre-buffering device has the following beneficial effects:

[0035] (1) The buffer tank is set up to provide a buffer space to absorb the pressure fluctuation of the water sample, ensuring that the output water sample pressure is smooth, which is beneficial to improving the service life of subsequent water sample detection equipment.

[0036] (2) The setting of the exhaust pipe reduces the dissolved gas in the water sample, which is beneficial to improving the accuracy of the subsequent detection device for the water sample.

[0037] (3) The installation of a sewage pipe reduces the solid matter in the water sample, which is beneficial to improving the service life of subsequent water sample testing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the overall structure of a water sample pre-buffer device of the utility model;

[0039] Figure 2 This is a schematic diagram of the internal structure of a water sample pre-buffer device of the utility model;

[0040] Figure 3 This is a schematic diagram of an online production wastewater monitoring system of the utility model.

[0041] The icon marks are explained as follows:

[0042] 1. Buffer tank; 11. Grid; 12. Top cover; 2. Exhaust pipe; 21. Mist catcher; 3. Inlet pipe; 4. Outlet pipe; 5. Sewage pipe; 51. First ball valve; 52. Sewage pipe; 53. Second ball valve; 6. Overflow pipe; 7. Pressure reducing valve. DETAILED DESCRIPTION

[0043] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0044] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0045] Example 1

[0046] like Figure 1 and Figure 2 The figure shows the first embodiment of a water sample pre-buffer device of the present invention, which includes a buffer tank 1, an exhaust pipe 2, an inlet pipe 3, an outlet pipe 4 and a sewage pipe 5. The inlet pipe 3 and the outlet pipe 4 are both arranged on the side of the buffer tank 1, the sewage pipe 5 is arranged at the bottom of the buffer tank 1, and the exhaust pipe 2 is arranged at the top of the buffer tank 1. The buffer tank 1 is a funnel-shaped structure.

[0047] Through this setting, the water sample pre-buffer device is connected to the sampling point of the water sample system, and the water sample enters the buffer tank 1 from the inlet pipe 3. The space is increased, which is conducive to absorbing the pressure fluctuation of the water sample and alleviating the impact on the subsequent pipeline. After the water sample accumulates in the funnel, the solid particles in the water sample sink to the bottom of the buffer tank 1 during the accumulation of the water sample, and move along the funnel-shaped buffer tank 1 to the sewage pipe 5 for accumulation; the natural gas dissolved in the water sample will also float up during the accumulation of the water sample and be discharged from the exhaust pipe 2; as the water sample accumulates, the liquid level in the buffer tank 1 rises to the outlet pipe 4, and the clean water sample on the upper layer flows out from the outlet pipe 4. The water sample that has completed the pre-treatment enters the subsequent analysis pipeline.

[0048] As an embodiment of the present invention, an overflow pipe 6 is further included. The overflow pipe 6 is located above the outlet pipe 4 and is connected to the buffer tank 1 .

[0049] With this arrangement, when the flow at the inlet pipe 3 is too large, causing the water level in the buffer tank 1 to be too high and exceeding the outlet pipe 4, the excess water sample can flow out from the overflow pipe 6 to prevent the water level from rising to the exhaust pipe 2, thereby preventing the exhaust effect from being affected or even causing leakage.

[0050] As an embodiment of the present invention, a mist catcher 21 is further provided on the exhaust pipe 2 , and the mist catcher 21 is located in the middle of the exhaust pipe 2 .

[0051] When the water sample in the buffer tank 1 flashes out gas, the gas may separate from the water sample in the form of bubbles, foam, etc. Through this setting, the mist collector 21 will intercept the bubbles, foam, etc. and make them burst. The gas inside the bubbles continues to be discharged along the exhaust pipe 2, and the liquid in the bubbles drips back into the buffer tank 1, which can prevent the bubbles from blocking the exhaust pipe 2 and prevent liquid leakage caused by the liquid contained in the bubbles being discharged from the exhaust pipe 2.

[0052] As an embodiment of the present invention, a gooseneck structure is further provided at the end of the exhaust pipe 2, and the gooseneck opening is arranged downward.

[0053] This setting does not affect the exhaust effect of the exhaust pipe 2 itself, and can prevent external water samples from entering the buffer tank 1 along the exhaust pipe 2, thereby avoiding contamination of the water sample. It is beneficial to ensure the singleness of the water sample and improve the accuracy of subsequent water sample detection.

[0054] As an embodiment of the present invention, the buffer tank 1 is a cone structure, and the inlet pipe 3 and the outlet pipe 4 are respectively arranged on two opposite sides of the buffer tank 1 .

[0055] This setting method is conducive to ensuring that the water sample has a single flow direction after entering the buffer tank 1, avoiding the formation of vortexes in the buffer tank 1 that disturb the bottom sediment, and is conducive to improving the separation effect of impurities in the water sample in the buffer tank 1 and improving the cleanliness of the water sample.

[0056] As an embodiment of the present invention, a pressure reducing valve 7 is further included. The pressure reducing valve 7 is installed at the end of the inlet pipe 3 away from the buffer tank 1 .

[0057] Through this setting, the pressure reducing valve 7 is placed in front, so that the water sample pre-buffer device can fully absorb the erosion effect caused by the pressure reducing valve 7. The pressure fluctuation of the inlet pipe 3 of the buffer device will not be transmitted to the outlet pipe 4. The fluid driving force at the outlet pipe 4 comes from the gravity generated by the liquid height difference and is only related to the physical height of the buffer device.

[0058] As an embodiment of the present invention, the sewage pipe 5 includes a first ball valve 51, a sewage pipe 52 and a second ball valve 53 connected in sequence. The first ball valve 51 is installed at the bottom of the buffer tank 1. The first ball valve 51 is used to control the connection state between the sewage pipe 52 and the buffer tank 1, and the second ball valve 53 is used to control the connection state between the sewage pipe 52 and the outside.

[0059] Through the setting mode, when the water sample analysis line is in the analysis state, the water sample needs to be continuously provided, the first ball valve 51 is opened and the second ball valve 53 is closed, and the water sample deposited in the buffer tank 1 slides along the conical bottom surface to the pollution-accepting pipe 52; when the water sample analysis line is in the cleaning state, the water sample does not need to be continuously provided at this time, the water inlet pipe stops water inlet, the first ball valve 51 is closed first, and then the second ball valve 53 is opened, so that the deposits in the pollution-accepting pipe 52 are discharged and the water sample in the buffer tank 1 is not affected, and when the pollution discharge is completed, the first ball valve 51 is opened again after the second ball valve 53 is closed, and the water sample pre-buffering device can restore normal work.

[0060] Embodiment 2

[0061] The following is a second embodiment of the water sample pre-buffering device of the utility model, which is similar to the first embodiment, and the difference lies in that the buffer tank 1 is further provided with a grid net 11, a top cover 12 and an observation window.

[0062] As an embodiment of the utility model, the buffer tank 1 is further provided with a grid net 11, which is arranged at the communication position of the outlet pipe 4 and the buffer tank 1.

[0063] Through the setting mode, the grid net 11 can further intercept some solid objects, so as to avoid that the solid objects are discharged from the outlet pipe 4 together with the water sample under the action of inertia.

[0064] As an embodiment of the utility model, the buffer tank 1 is further provided with a top cover 12, which is arranged on the top of the buffer tank 1 and detachably connected with the buffer tank 1, and the exhaust pipe 2 is arranged on the top cover 12.

[0065] Through the setting mode, the user can open the top cover 12 of the buffer tank 1 to clean and maintain the inside of the buffer tank 1 from the top, which is beneficial to improve the convenience of the water sample pre-buffering device in the maintenance process.

[0066] As an embodiment of the utility model, the buffer tank 1 is further provided with an observation window, which is arranged on the side wall of the buffer tank 1.

[0067] Through the setting mode, the user can observe the water sample state in the buffer tank 1 in real time through the observation window, and when abnormal working conditions such as blockage, excessive deposits or excessive liquid level occur in the water sample buffer tank 1, the user can timely find and maintain the buffer tank 1, thereby improving the practicability of the water sample buffering device.

[0068] Embodiment 3

[0069] As Figure 3The utility model discloses a production sewage on -line monitoring system's embodiment shows, including the sampling port that sets gradually, like the water sample prebuffer device of second embodiment, instrument air circuit, cleaning fluid circuit and analysis cabinet, sampling port, water sample prebuffer device and analysis cabinet are communicated gradually, and the second ball valve is equipped between sampling port and water sample prebuffer device, and instrument air circuit and cleaning fluid circuit are respectively through two control valves and are installed between water sample prebuffer device and analysis cabinet, and still be equipped with the drainage branch between analysis cabinet and cleaning fluid circuit.

[0070] Through this setting mode, the pressure reducing valve is located before the water inlet pipe, and the water sample buffer device can buffer the erosion phenomenon caused by the pressure reducing valve, avoids that instrument air circuit, cleaning fluid circuit and analysis cabinet are directly impacted by water sample, is favorable for improving the service life and sampling precision of production sewage on -line monitoring system.

[0071] Obviously, the above embodiment of the utility model is only for clearly illustrating the utility model, and is not the limitation of the embodiment of the utility model. For ordinary skilled person in the art, on the basis of the above description, other different forms of changes or changes can be made. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement, etc. made in the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A water sample pre-buffer device, characterized in that: The invention comprises a buffer tank (1), an exhaust pipe (2), an inlet pipe (3), an outlet pipe (4) and a sewage pipe (5); the inlet pipe (3) and the outlet pipe (4) are both arranged on the side of the buffer tank (1); the sewage pipe (5) is arranged at the bottom of the buffer tank (1); the exhaust pipe (2) is arranged at the top of the buffer tank (1); and the buffer tank (1) is a funnel-shaped structure.

2. The water sample pre-buffer device according to claim 1, characterized in that: It also includes an overflow pipe (6), which is located above the outlet pipe (4) and is connected to the buffer tank (1).

3. The water sample pre-buffer device according to claim 1, characterized in that: The exhaust pipe (2) is also provided with a mist catcher (21), and the mist catcher (21) is located in the middle of the exhaust pipe (2).

4. The water sample pre-buffer device according to claim 3, characterized in that: The end of the exhaust pipe (2) is also provided with a gooseneck structure, and the gooseneck opening is arranged downward.

5. The water sample pre-buffer device according to claim 1, characterized in that: The buffer tank (1) is a cone structure, and the inlet pipe (3) and the outlet pipe (4) are respectively arranged on two opposite sides of the buffer tank (1).

6. The water sample pre-buffer device according to claim 5, characterized in that: It also includes a pressure reducing valve (7), which is arranged at the end of the inlet pipe (3) away from the buffer tank (1).

7. The water sample pre-buffer device according to claim 5, characterized in that: A grid (11) is further provided in the buffer tank (1), and the grid (11) is provided at the point where the outlet pipe (4) communicates with the buffer tank (1).

8. The water sample pre-buffer device according to any one of claims 1 to 7, characterized in that: The sewage discharge pipe (5) comprises a first ball valve (51), a sewage receiving pipe (52) and a second ball valve (53) which are connected in sequence. The first ball valve (51) is installed at the bottom of the buffer tank (1). The first ball valve (51) is used to control the communication state between the sewage receiving pipe (52) and the buffer tank (1). The second ball valve (53) is used to control the communication state between the sewage receiving pipe (52) and the outside.

9. The water sample pre-buffer device according to claim 8, characterized in that: The buffer tank (1) is further provided with a top cover (12), the top cover (12) being mounted on the top of the buffer tank (1) and being detachably connected to the buffer tank (1), and the exhaust pipe (2) being mounted on the top cover (12).

10. An online monitoring system for industrial wastewater, characterized in that: It includes a sampling port, a water sample pre-buffer device according to any one of claims 1 to 9, an instrument air circuit, a cleaning liquid circuit and an analysis cabinet arranged in sequence, the sampling port, the water sample pre-buffer device and the analysis cabinet are connected in sequence, a second ball valve is provided between the sampling port and the water sample pre-buffer device, the instrument air circuit and the cleaning liquid circuit are respectively installed between the water sample pre-buffer device and the analysis cabinet through two control valves, and a drainage branch is also provided between the analysis cabinet and the cleaning liquid circuit.

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