Oil in Water Detection System

Abstract

The present invention proposes an oil-in-water detection system, including a sampling and filtering device, a defoamer, a mixer, a sample pool, and an ultraviolet fluorescence analyzer. The sampling and filtering device includes a sampling tube and a filter assembly. The sampling tube is connected to the inlet of the filter assembly to extract the sample liquid into the filter assembly for filtration; the inlet of the defoamer is connected to the outlet of the filter assembly to perform defoaming treatment on the sample liquid; the mixer, the inlet of the mixer is connected to the outlet of the defoamer to mix the components in the sample liquid evenly; the sample pool is connected to the outlet of the mixer to accommodate the sample liquid; the probe of the ultraviolet fluorescence analyzer is arranged toward the sample pool. The technical solution of the present application improves the speed, sensitivity, and detection accuracy of oil-in-water detection.

Description

Technical Field

[0001] The invention relates to the technical field of offshore oil exploitation, and in particular to an oil-in-water detection system. Background Art

[0002] The discharge of production wastewater in offshore oil production often exceeds the standard, and the degree of damage to the ocean and surrounding environment is immeasurable. The current trend is to further reduce the oil content of production wastewater to ensure that the oil content of production wastewater (hereinafter referred to as "production water") remains below the regulatory level. Currently, the commonly used method for detecting oil concentration in water is mostly sampling and analysis, which requires operators to take samples at regular intervals and at fixed points, and then send the samples to the laboratory for concentration measurement with the help of extraction agents. This type of detection has the disadvantages of long analysis time, cumbersome operation process, low sensitivity, and large errors. Summary of the invention

[0003] The main purpose of the present invention is to provide an oil in water detection system, aiming to improve the speed, sensitivity and detection accuracy of oil in water detection.

[0004] To achieve the above object, the present invention provides an oil in water detection system, comprising:

[0005] A sampling and filtering device, the sampling and filtering device comprising a sampling tube and a filtering assembly, the sampling tube being connected to the inlet of the filtering assembly to draw a sample liquid into the filtering assembly for filtering;

[0006] A defoamer, the inlet of which is connected to the outlet of the filter assembly to perform defoaming treatment on the sample liquid;

[0007] A mixer, the inlet of the mixer is connected to the outlet of the defoamer to mix the components in the sample liquid evenly;

[0008] a sample pool, the sample pool is communicated with the outlet of the mixer to contain the sample liquid; and an ultraviolet fluorescence analyzer, the probe of the ultraviolet fluorescence analyzer is arranged toward the sample pool.

[0009] Optionally, the filter assembly includes two filters, and the two filters are arranged in parallel;

[0010] The sampling and filtering device also includes a first switch structure and a second switch structure. The first switch structure is arranged between the sampling tube and the inlet of the two filters to control the connection between the sampling tube and the inlet of one of the filters. The second switch structure is arranged between the defoamer and the outlet of the two filters to control the connection between the outlet of the filter connected to the sampling tube and the defoamer.

[0011] Optionally, the filter is also provided with a first sewage outlet.

[0012] Optionally, the sample pool is provided with a liquid discharge port;

[0013] And / or, the sample pool is provided with a sampling port.

[0014] Optionally, the oil-in-water detection system further comprises a cleaning device, and the cleaning device is used to clean the sampling and filtering device, the defoamer, the mixer, the sample pool and the probe.

[0015] Optionally, the cleaning device includes a steam generator, and the steam generator is connected to the sampling and filtering device, the defoamer, the mixer and the sample pool respectively.

[0016] Optionally, the oil in water detection system further comprises a flow meter for detecting the flow rate of the sample liquid in the oil in water detection system.

[0017] Optionally, the defoamer comprises:

[0018] A shell, wherein a defoaming cavity is formed in the shell, and the shell is provided with an outlet and an air outlet communicating the defoaming cavity with the outside, wherein the air outlet is located above the outlet; and

[0019] The liquid inlet pipe is inserted into the defoaming cavity from the top of the shell and extends downward along the height direction of the shell. The wall of the liquid inlet pipe is provided with a plurality of penetration holes, and the aperture of the penetration holes is smaller than the diameter of the liquid inlet pipe.

[0020] Optionally, the defoamer further comprises a baffle, which is arranged in the defoaming chamber and is disposed transversely between the liquid inlet pipe and the outlet of the shell, and the baffle is spaced apart from the bottom wall of the defoaming chamber.

[0021] Optionally, the oil in water detection system further includes a monitoring unit.

[0022] The oil-in-water detection system of the present invention comprises a sampling and filtering device, a defoamer, a mixer and a sample pool which are connected in sequence. After directly extracting the production water sample liquid and filtering impurities through the sampling and filtering device, the bubbles in the sample liquid are eliminated through the defoamer, and the oil and water in the sample liquid are mixed evenly in the mixer and then flow into the sample pool, and then the ultraviolet fluorescence analyzer irradiates the sample liquid with ultraviolet light and obtains the oil content data in the sample liquid according to the fluorescence intensity generated by the sample liquid. Compared with the traditional detection method of sampling and analyzing in the laboratory, the oil-in-water detection system of the present invention monitors the oil in water more quickly, and the sample liquid is pre-treated by the filtering component, the defoamer and the mixer first, so as to improve the detection accuracy of the oil content in the sample liquid. At the same time, the oil-in-water detection system can continuously extract the production water sample liquid to obtain the oil content data in the water in real time, so as to timely discover the phenomenon of excessive oil content in the production water and improve the monitoring sensitivity of the oil content in the production water. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 It is a structural diagram of an embodiment of the oil-in-water detection system of the present invention;

[0025] Figure 2 It is a structural diagram of another embodiment of the oil in water detection system of the present invention;

[0026] Figure 3 It is a structural diagram of the defoamer of the present invention;

[0027] Figure 4 This is a structural diagram of an embodiment of a sampling and filtering device of the present invention.

[0028] Description of Figure Numbers:

[0029]

[0030]

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] The present invention provides an oil in water detection system 100 .

[0037] Please refer to Figure 1 and Figure 2 In some embodiments of the oil in water detection system 100 of the present invention, the oil in water detection system 100 includes:

[0038] A sampling and filtering device 10, wherein the sampling and filtering device 10 comprises a sampling tube 11 and a filtering assembly 12, wherein the sampling tube 11 is connected to an inlet of the filtering assembly 12 to extract a sample liquid into the filtering assembly 12 for filtering;

[0039] A defoamer 20, the inlet of the defoamer 20 is connected to the outlet of the filter assembly 12, so as to perform defoaming treatment on the sample liquid;

[0040] A mixer 30, wherein the inlet of the mixer 30 is connected to the outlet of the defoamer 20 so as to mix the components in the sample liquid uniformly;

[0041] a sample pool 40, the sample pool 40 being connected to the outlet of the mixer 30 to receive the sample liquid; and

[0042] An ultraviolet fluorescence analyzer 50 , wherein a probe 52 of the ultraviolet fluorescence analyzer 50 is disposed toward the sample pool 40 .

[0043] The technical solution of the present application sequentially connects the sampling filter device 10, the defoamer 20, the mixer 30 and the sample pool 40 through pipelines. When actually used, the sampling tube 11 of the sampling filter device 10 is inserted into the sea, and the production water sample liquid enters the sampling tube 11 and the filter assembly 12 through the production water pressure. Impurities are filtered out, and then the filtered sample liquid is transported to the defoamer 20, and the sample liquid is defoamed by the defoamer 20 to remove the bubbles in the sample liquid, so as to avoid excessive bubbles in the sample liquid affecting the detection effect; further, the defoamed sample liquid is transported to the mixer 30 for sufficient mixing, so that the water and oil in the sample liquid are evenly mixed, thereby improving the detection accuracy; the sample liquid obtained after the above-mentioned pretreatment process is completed is then transported to the sample pool 40, and the present application adopts an ultraviolet fluorescence analyzer 50 to detect the sample liquid. Specifically, the ultraviolet fluorescence analyzer 50 includes an analyzer body 51 and a probe 52. The probe 52 of the ultraviolet fluorescence analyzer 50 is arranged toward the sample liquid in the sample pool 40, and emits ultraviolet light to irradiate the sample liquid in the sample pool 40. Since aromatic hydrocarbons in petroleum can generate fluorescence under ultraviolet light excitation, the ultraviolet fluorescence analyzer 50 can calculate the oil concentration in the sample liquid according to the fluorescence intensity. With such a configuration, it is not necessary to extend the probe 52 into the sample pool 40 to contact the sample liquid, thereby preventing impurities and oil in the sample liquid from being deposited on the probe 52 and affecting the accuracy of the analysis and detection results. At the same time, the oil in water detection system 100 can continuously extract production water samples for detection, so as to obtain the oil content data in the water in real time, so as to realize real-time and effective monitoring of the oil in water phenomenon.

[0044] Therefore, it can be understood that the oil in water detection system 100 of the present invention includes a sampling and filtering device 10, a defoamer 20, a mixer 30 and a sample pool 40 which are connected in sequence through pipelines. After the production water sample is directly extracted and impurities are filtered out by the sampling and filtering device 10, the bubbles in the sample are eliminated by the defoamer 20, and the oil and water in the sample are mixed evenly in the mixer 30 and then flow into the sample pool 40. Then, the ultraviolet fluorescence analyzer 50 irradiates the sample with ultraviolet light and obtains the oil content data in the sample according to the fluorescence intensity generated by the sample. Compared with the traditional detection method of sampling and then analyzing in the laboratory, the oil in water detection system 100 of the present invention is faster to monitor the oil in water, and the sample is first pre-treated by the filter component 12, the defoamer 20 and the mixer 30, so as to improve the detection accuracy of the oil content in the sample. At the same time, the oil in water detection system 100 can continuously extract production water samples to obtain real-time data on the oil content in the water, so as to promptly detect excessive oil content in the production water and improve the monitoring sensitivity of the oil content in the production water.

[0045] Please refer to Figure 1 and Figure 2 In some embodiments of the oil in water detection system 100 of the present invention, the filter assembly 12 includes:

[0046] Two filters 121, the two filters 121 are arranged in parallel;

[0047] a first switch structure 13, which is disposed at the inlet end of the filter assembly 12 to control the communication between the sampling tube 11 and an inlet of one of the filters 121; and

[0048] The second switch structure 14 is disposed at the outlet end of the filter assembly 12 to control the outlet of the filter 121 connected to the sampling tube 11 to be connected to the defoamer 20 .

[0049] In this embodiment, two filters 121 are connected in parallel in the filter assembly 12, and a first switch structure 13 and a second switch structure 14 are respectively provided at the inlet and outlet ends of the filter assembly 12, so that one of the filters 121 is connected between the sampling tube 11 and the defoamer 20 to filter the sample liquid; at this time, the other filter 121 is in an idle state, and the idle filter 121 can be cleaned and maintained. That is, the technical solution of this embodiment, through two parallel filters 121 to form a filter assembly 12, can enable the other filter 121 when one of the filters 121 is damaged or too dirty, so that the oil in water detection system 100 can continue to operate, avoiding interruption of the detection process due to cleaning and maintenance of the filter 121, thereby ensuring the continuity of the oil content in water monitoring process and timely discovering the problem of excessive oil.

[0050] Please refer to Figure 1 and Figure 2 In some embodiments of the oil-in-water detection system 100 of the present invention, the first switch structure 13 is a three-way valve, the inlet of the three-way valve is connected to the sampling tube 11, and the two outlets of the three-way valve are respectively connected to the inlets of the two filters 121, and the three-way valve is used to control the communication between the sampling tube 11 and the inlet of one of the filters 121;

[0051] Alternatively, the first switch structure 13 includes two first control valves, each of which is disposed between an inlet of the filter 121 and the sampling tube 11 to control the connection between the corresponding filter 121 and the sampling tube 11 .

[0052] In this embodiment, the first switch structure 13 can be a three-way valve or two first control valves. It can be understood that when a three-way valve is used as the first switch structure 13, the inlets of the sampling tube 11 and the two filters 121 are respectively connected to the three conducting ports of the three-way valve. The user can control the valve core of the three-way valve to switch the liquid flow path in the three-way valve, thereby controlling the connection state between the sampling tube 11 and the two filters 121. The three-way valve is mostly suitable for manual control, so that the user can select the filter 121 according to their needs.

[0053] In some embodiments, the first switch structure 13 includes two first control valves, each of which is disposed between an inlet of a filter 121 and the sampling tube 11, and one of the filters 121 is connected to the sampling tube 11 by controlling the on-off state of the two first control valves. The first control valves may be controlled manually or by a control system according to a preset program, which is not specifically limited here.

[0054] Please refer to Figure 1 and Figure 2 In some embodiments of the oil in water detection system 100 of the present invention, the second switch structure 14 includes two second control valves, each of which is arranged between the outlet of the filter 121 and the defoamer 20 to control the connection between the outlet of the corresponding filter 121 and the defoamer 20.

[0055] In this embodiment, the second switch structure 14 includes two second control valves, each of which is disposed between the outlet of a filter 121 and the defoamer 20, and one of the filters 121 is connected to the sampling tube 11 by controlling the on-off state of the two second control valves. The second control valves may be controlled manually or by a control system according to a preset program, which is not specifically limited here.

[0056] In some embodiments of the oil in water detection system 100 of the present invention, the filter 121 includes:

[0057] A housing 1211, wherein a receiving cavity 12111 is formed in the housing 1211, and the housing 1211 is provided with a liquid inlet and a liquid outlet communicating with the receiving cavity 12111, wherein the liquid inlet is provided on a bottom wall of the housing 1211; and

[0058] The filter element 1212 is arranged in the accommodating cavity 12111 and extends along the height direction of the shell 1211. A filter cavity 12123 is formed in the filter element 1212. The side wall of the filter element 1212 is provided with a penetration hole 221 connecting the filter cavity 12123 and the accommodating cavity 12111. One end of the filter element 1212 is connected to the liquid inlet.

[0059] The filter 121 proposed in the present invention is mainly used for filtering the production water sample liquid, so that the subsequent detection of the oil content in the production water sample liquid is more accurate. Specifically, the filter 121 proposed in the present invention includes a housing 1211 as a mounting base, a mounting cavity is formed in the housing 1211, and a filter element 1212 is arranged in the mounting cavity. At this time, the production water sample liquid is drawn in from the liquid inlet, and after being filtered by the filter element 1212, the sample liquid infiltrates into the mounting cavity from the permeation hole 221 and flows out from the liquid outlet, so that the sample liquid can be detected later.

[0060] Please refer to Figure 4 In some embodiments of the oil in water detection system 100 of the present invention, the filter element 1212 includes:

[0061] A filter screen 12121, wherein the filter screen 12121 is disposed around the circumference of the housing 1211 and encloses the filter chamber 12123; and

[0062] The filter material 12122 is disposed in the filter cavity 12123 to absorb impurities in the sample liquid.

[0063] In this embodiment, the filter element 1212 includes a filter screen 12121 and a filter material 12122. The filter screen 12121 is arranged in the installation cavity and is arranged around the circumference of the outer shell 1211 to form a filter cavity 12123. At the same time, the filter material 12122 is arranged in the filter cavity 12123 to adsorb impurities in the sample liquid. At this time, after the production water sample liquid enters the filter cavity 12123, the impurities are adsorbed on the filter material 12122, and the sample liquid seeps out from the penetration hole 221 on the filter screen 12121, thereby preventing impurities from clogging the penetration hole 221 and affecting the outflow of the sample liquid.

[0064] Referring to the drawings, in some embodiments of the oil-in-water detection system 100 of the present invention, the filter material 12122 is an oleophobic filter material.

[0065] In this embodiment, the filter material 12122 is made of oleophobic material, which can prevent the oil in the sample liquid from being adsorbed on the filter material 12122, so that the oil in the sample liquid seeps out from the penetration hole 221, thereby preventing the oil content in the water from being reduced due to the oil adsorption by the filter material 12122, thereby affecting the detection result of the oil content in the water.

[0066] Please refer to Figure 4 In some embodiments of the oil in water detection system 100 of the present invention, the filter 121 is also provided with a first sewage outlet 12112 .

[0067] In this embodiment, the filter 121 is also provided with a first sewage outlet 12112. Specifically, the top wall of the housing 1211 in the filter 121 is provided with a first sewage outlet 12112, and the first sewage outlet 12112 is connected to the end of the filter element 1212 away from the liquid inlet. At this time, when the production water sample flows into the filter element 1212 from the liquid inlet, part of the sample liquid is filtered by the filter element 1212 and then seeps out from the permeation hole 221 into the accommodating cavity 12111, so as to flow out through the liquid outlet for subsequent detection. The other part of the sample liquid can rinse the filter material 12122 and take out the impurities from the first sewage outlet 12112, so as to avoid the accumulation of impurities in the filter cavity 12123 and affect the filtering effect. Furthermore, in some filters 121, a control valve can be set at the first sewage outlet 12112 to control the opening and closing of the first sewage outlet 12112. The sewage outlet can be opened to clean the filter 121 after a certain working time is preset, and when the first sewage outlet 12112 is closed, the flow rate of the sample liquid seeping out of the infiltration hole 221 can be increased.

[0068] Please refer to Figure 4 In some embodiments of the oil in water detection system 100 of the present invention, the plane where the opening of one end of the sampling tube 11 facing away from the housing 1211 is located is set at an angle with the axis of the sampling tube 11, and the angle α satisfies 140°≤α≤10°.

[0069] In this embodiment, the plane where the opening of the end of the sampling tube 11 facing away from the shell 1211 is located is set at an angle with the axial direction of the sampling tube 11, and the angle α satisfies 140°≤α≤10°. With this arrangement, when the sampling tube 11 is inserted into the produced water for sampling, the opening of the sampling tube 11 can be oriented in the same direction as the flow direction of the produced water, thereby preventing impurities carried by the flowing produced water from entering the sampling tube 11 along with the produced water, thereby reducing the impurities entering the sampling tube 11 and increasing the service life of the filter 121.

[0070] Please refer to Figure 3 In some embodiments of the oil in water detection system 100 of the present invention, the defoamer 20 includes:

[0071] A shell 21, wherein a defoaming cavity 211 is formed in the shell 21, and the shell 21 is provided with a liquid outlet and an air outlet 212 communicating the defoaming cavity 211 with the outside, wherein the air outlet 212 is located above the liquid outlet; and

[0072] The liquid inlet pipe 22 is inserted into the defoaming cavity 211 from the top of the shell 21 and extends downward along the height direction of the shell 21. The tube wall of the liquid inlet pipe 22 is provided with a plurality of penetration holes 221, and the aperture of the penetration holes 221 is smaller than the tube diameter of the liquid inlet pipe 22.

[0073] The defoamer 20 proposed in the present application can pre-treat the sample liquid when measuring the oil content in water to eliminate bubbles in the sample liquid and improve the accuracy of measurement. Specifically, the defoamer 20 includes a shell 21 as a bearing base and a liquid inlet pipe 22 inserted in the shell 21. A defoaming cavity 211 is formed in the shell 21. The liquid inlet pipe 22 is inserted in the defoaming cavity 211 from the top wall of the defoaming cavity 211 and extends downward along the height direction of the shell 21. A plurality of penetration holes 221 are opened on the side wall of the liquid inlet pipe 22, and the aperture of the penetration hole 221 is smaller than the tube diameter of the liquid inlet pipe 22. At this time, when the sample liquid passes through the liquid inlet pipe 22, the sample liquid penetrates into the defoaming cavity 211 from the penetration hole 221, and bubbles larger than the aperture of the penetration hole 221 cannot pass through the penetration hole 221 and will directly burst, thereby eliminating the bubbles in the sample liquid. After the sample liquid enters the defoaming chamber 211 through the liquid inlet pipe 22, it flows out from the liquid outlet opened on the shell 21 for subsequent processing or direct detection, and the gas overflowed after the bubble bursts overflows from the gas outlet 212 opened on the shell 21, thereby preventing the gas from remaining in the defoaming chamber 211, causing the air pressure in the defoaming chamber 211 to be too high, resulting in the re-generation of bubbles in the sample liquid in the defoaming chamber 211.

[0074] Therefore, it can be understood that the present invention proposes a defoamer 20, which introduces the sample liquid into the defoaming chamber 211 of the shell 21 through the liquid inlet pipe 22. When the sample liquid flows through the liquid inlet pipe 22, it will seep out from the penetration hole 221 on the side wall of the liquid inlet pipe 22, and the bubbles larger than the aperture of the penetration hole 221 cannot pass through the penetration hole 221, and will directly burst, thereby reducing the bubble content in the sample liquid. After the bubble bursts, the overflowing gas is discharged from the gas outlet 212 of the shell 21, avoiding the gas remaining in the defoaming chamber 211, resulting in excessive air pressure in the defoaming chamber 211, and causing the sample liquid in the defoaming chamber 211 to regenerate bubbles. That is, before the sample liquid is tested, the sample liquid can be pre-treated by the defoamer 20 of the present invention, so that the bubbles in the sample liquid can be eliminated to improve the detection accuracy of the oil content in water.

[0075] Please refer to Figure 3 In some embodiments of the defoamer 20 of the present invention, the liquid outlet is opened on the side wall of the defoaming chamber 211 and is spaced apart from the bottom wall of the defoaming chamber 211.

[0076] In this embodiment, the liquid outlet is provided on the side wall of the defoaming chamber 211 and is spaced from the bottom wall of the defoaming chamber 211. At this time, when the sample liquid enters the defoaming chamber 211 through the liquid inlet pipe 22, the sample liquid is first deposited in the defoaming chamber 211 until the height of the sample liquid reaches the height of the liquid outlet and then flows out from the liquid outlet. In this way, the sample liquid is precipitated in the defoaming chamber 211, and the impurities in the sample liquid are deposited in the defoaming chamber 211, so that too many impurities in the sample liquid are avoided, the detection accuracy of the sample liquid is improved, and the sample liquid seeps out after reaching the height of the liquid outlet, so that the outflow speed of the sample liquid is uniform.

[0077] Please refer to the figure, in some embodiments of the defoamer 20 of the present invention, the defoamer 20 also includes a baffle 23, the baffle 23 is arranged in the defoaming chamber 211, and is horizontally separated between the liquid inlet pipe 22 and the liquid outlet, and the baffle 23 is spaced apart from the bottom wall of the defoaming chamber 211.

[0078] In this embodiment, a baffle 23 is provided in the defoaming chamber 211, and the baffle 23 is horizontally separated from the liquid inlet pipe 22 and the liquid outlet. On the one hand, it prevents the sample liquid from being directly sprayed toward the liquid outlet due to excessive pressure in the liquid inlet pipe 22 when the sample liquid flows out from the penetration hole 221; on the other hand, since the sample liquid will overflow only after the defoaming chamber 211 reaches the height of the liquid outlet after entering the defoaming chamber 211, and the sample liquid seeps out from multiple penetration holes 221 at the same time, it is easy for the sample liquid in the defoaming chamber 211 to generate a vortex and stir the impurities deposited in the bottom wall. At this time, the liquid inlet pipe 22 and the liquid outlet are separated by the baffle 23, so that the defoaming chamber 211 is divided into spaces on both sides of the liquid inlet pipe 22 and the liquid outlet, thereby preventing the vortex induced on one side of the liquid inlet pipe 22 from affecting the sample liquid on the side of the liquid outlet, avoiding affecting the outflow of the sample liquid, and avoiding impurities being stirred and flowing out with the sample liquid.

[0079] Please refer to Figure 3 In some embodiments of the oil-in-water detection system 100 of the present invention, a second sewage outlet 212 connected to the outside is opened on the bottom wall of the defoaming chamber 211.

[0080] In the present embodiment, a second sewage outlet 212 connected to the outside is provided on the bottom wall of the defoaming chamber 211. It can be understood that when the sample liquid enters the defoaming chamber 211 through the liquid inlet pipe 22, the sample liquid is first deposited in the defoaming chamber 211 until the height of the sample liquid reaches the height of the liquid outlet and then flows out from the liquid outlet. Such a configuration allows the sample liquid to be precipitated in the defoaming chamber 211, so that impurities in the sample liquid are deposited in the defoaming chamber 211. At this time, the defoaming chamber 211 can be cleaned as needed, and impurities can be discharged from the second sewage outlet 212 to avoid impurities accumulating in the defoaming chamber 211 and blocking the liquid inlet pipe 22 and the liquid outlet.

[0081] Please refer to Figure 3 In some embodiments of the oil-in-water detection system 100 of the present invention, the bottom wall of the defoaming chamber 211 is recessed toward the side away from the top wall, and the second sewage outlet 212 is opened at the lowest point of the bottom wall.

[0082] In this embodiment, the bottom wall of the defoaming chamber 211 is recessed toward the side away from the top wall, and the second sewage outlet 212 is opened at the lowest point of the bottom wall. This arrangement allows impurities in the sample liquid to directly enter the second sewage outlet 212 along the bottom wall, so that the impurities can be completely discharged and avoid impurities remaining in the defoaming chamber 211.

[0083] Please refer to Figure 3 In some embodiments of the oil-in-water detection system 100 of the present invention, a liquid discharge port 222 is provided at one end of the liquid inlet pipe 22 inserted into the defoaming chamber 211 .

[0084] In the present embodiment, a liquid discharge port 222 is provided at one end of the liquid inlet pipe 22 inserted into the defoaming chamber 211. Such a configuration allows impurities that cannot seep out of the permeation hole 221 to flow out from the liquid discharge port 222 and be deposited on the bottom wall of the defoaming chamber 211. At the same time, part of the sample liquid can flow out through the liquid discharge port 222, thereby preventing the sample liquid from being not removed from the permeation hole 221 in time and affecting the flow rate of the sample liquid, thereby affecting the timeliness of the subsequent monitoring of the oil content in water.

[0085] Please refer to Figure 1 and Figure 2 In some embodiments of the oil-in-water detection system 100 of the present invention, the oil-in-water detection system 100 further includes a cleaning device 60 for cleaning the sampling and filtering device 10, the defoamer 20, the mixer 30 and the detection device.

[0086] It can be understood that the oil-in-water detection system 100 of the present application continuously collects production water sample liquid and passes the sample liquid through the sampling filter device 10, the defoamer 20, the mixer 30 and the detection device to obtain the oil content in the water in the sample liquid. After long-term use, the sampling filter device 10, the defoamer 20, the mixer 30 and the detection device will inevitably deposit the oil and impurities in the production water sample liquid that are not completely removed, thereby affecting the processing and detection results of the sample liquid by each device. In this embodiment, a cleaning device 60 is provided in the oil-in-water detection system 100 for cleaning the sampling filter device 10, the defoamer 20, the mixer 30 and the detection device, wherein the cleaning device 60 can be a single-wire and ultrasonic cleaning device 60 or a steam cleaning device 60, etc.

[0087] In some embodiments of the oil-in-water detection system 100 of the present invention, the cleaning device 60 is a steam generator, and the steam generator is respectively connected to the sampling and filtering device 10, the defoamer 20, the mixer 30 and the detection device.

[0088] In this embodiment, the cleaning device 60 is a steam generator, and the steam generator is connected to the filter 121, the defoamer 20, the mixer 30 and the detection device in the sampling filter device 10, that is, the steam generator generates steam and pours it into the pipeline of the oil in water detection system 100 to flush and clean each device. At this time, due to the high steam temperature of the steam generator, the oil stains in each device are dissolved and then flow out with the steam, thereby improving the cleaning efficiency.

[0089] In some embodiments, the cleaning device 60 further includes a steam valve, which is disposed at the outlet of the steam generator to control the opening of the steam generator, thereby cleaning each module in the oil in water detection system 100 according to actual needs.

[0090] Please refer to Figure 1 and Figure 2 , in some embodiments of the oil-in-water detection system 100 of the present invention, the sample pool 40 is provided with a drain port 41;

[0091] And / or, the sample pool 40 is provided with a sampling port 42 .

[0092] In the technical solution of the aforementioned embodiment, a sample pool 40 is provided in the detection device to receive the sample liquid so that the analyzer can fully detect the oil content in the sample liquid. In this embodiment, the sample pool 40 is provided with a liquid discharge port 41. It can be understood that the sample pool 40 receives the sample liquid after the aforementioned pretreatment process for detection by the ultraviolet fluorescence analyzer 50. If the sample liquid in the sample pool 40 is stored for a long time, the sample liquid extracted at different times will be mixed and affect the detection result. In this embodiment, the sample liquid is continuously discharged through the liquid discharge port 41, so that the sample liquid detected by the ultraviolet fluorescence analyzer 50 is always the sample liquid just extracted, so as to improve the detection accuracy.

[0093] In some embodiments, the sample pool 40 is provided with a sampling port 42 for the user to extract the sample liquid in the sample pool 40 , which can be used for laboratory testing to determine the detection accuracy of the ultraviolet fluorescence analyzer 50 ; it can also be used for other analytical testing work.

[0094] Please refer to Figure 1 and Figure 2 In some embodiments of the oil in water detection system 100 of the present invention, the oil in water detection system 100 further includes a flow meter 70 for detecting the flow rate of the sample liquid in the oil in water detection system 100 .

[0095] It can be understood that the technical solution of the present application is to continuously extract the production water sample liquid to detect and monitor the oil content in the production water sample liquid. In this embodiment, a flow meter 70 is set in the oil-in-water detection system 100 to detect the sample liquid flow rate in the oil-in-water detection system 100, so that the sample liquid flow rate can be adjusted to a suitable range to avoid the sample liquid flow rate being too fast or too slow. If the sample liquid flow rate is too fast, the ultraviolet fluorescence analyzer 50 cannot have sufficient response time to analyze the oil content in the sample liquid, resulting in inaccurate oil content detection; if the sample liquid flow rate is too slow, it cannot meet the purpose of real-time detection of the oil content in the production water.

[0096] Please refer to Figure 1 and Figure 2In some embodiments of the oil in water detection system 100 of the present invention, the oil in water detection system 100 further includes a monitoring unit 80 .

[0097] In this embodiment, the oil-in-water detection system 100 further includes a monitoring unit 80 to monitor and control the working state of each module in the oil-in-water detection system 100 to improve the degree of automation. For example, in some embodiments, the sampling and filtering device 10 includes two filters 121 arranged in parallel, and the opening and closing of the first switch structure 13 and the second switch structure 14 in the sampling and filtering device 10 can be controlled to switch the filters 121; in addition, the opening of the cleaning device 60 can also be controlled to clean each module. When the cleaning device 60 is a steam generator, the opening and closing of the control valve between the steam generator and each module is controlled, thereby improving the degree of automation of the oil-in-water detection system 100, reducing manual participation, and reducing labor intensity.

[0098] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A system for detecting oil in water, characterized in that: include: A sampling and filtering device, the sampling and filtering device comprising a sampling tube and a filtering assembly, the sampling tube being connected to the inlet of the filtering assembly to draw a sample liquid into the filtering assembly for filtering; A defoamer, the inlet of which is connected to the outlet of the filter assembly to perform defoaming treatment on the sample liquid; A mixer, the inlet of which is connected to the outlet of the defoamer to mix the sample liquid components uniformly; A sample pool, the sample pool is connected to the outlet of the mixer to accommodate the sample liquid; as well as An ultraviolet fluorescence analyzer, wherein a probe of the ultraviolet fluorescence analyzer is arranged toward the sample pool; The defoamer comprises a shell, a liquid inlet pipe and a baffle, a defoaming cavity is formed in the shell, an outlet and an air outlet are provided in the shell for connecting the defoaming cavity with the outside, and the air outlet is located above the outlet; the liquid inlet pipe is inserted into the defoaming cavity from the top of the shell, and extends downward along the height direction of the shell, a plurality of penetration holes are provided on the wall of the liquid inlet pipe, and the aperture of the penetration holes is smaller than the diameter of the liquid inlet pipe; The baffle is arranged in the defoaming cavity and is separated between the liquid inlet pipe and the outlet of the shell, and the baffle is spaced apart from the bottom wall of the defoaming cavity; The oil-in-water detection system further comprises a flow meter for detecting the flow rate of the sample liquid in the oil-in-water detection system.

2. The oil in water detection system according to claim 1, characterized in that: The filter assembly includes two filters, and the two filters are arranged in parallel; The sampling and filtering device also includes a first switch structure and a second switch structure. The first switch structure is arranged between the sampling tube and the inlet of the two filters to control the connection between the sampling tube and the inlet of one of the filters. The second switch structure is arranged between the defoamer and the outlet of the two filters to control the connection between the outlet of the filter connected to the sampling tube and the defoamer.

3. The oil in water detection system according to claim 2, characterized in that: The filter is also provided with a first sewage outlet.

4. The oil in water detection system according to claim 1, characterized in that: The sample pool is provided with a liquid discharge port; And / or, the sample pool is provided with a sampling port.

5. The oil in water detection system according to claim 1, characterized in that: The oil-in-water detection system further comprises a cleaning device, and the cleaning device is used to clean the sampling and filtering device, the defoamer, the mixer, the sample pool and the probe.

6. The oil in water detection system according to claim 5, characterized in that: The cleaning device comprises a steam generator, and the steam generator is respectively connected with the sampling and filtering device, the defoamer, the mixer and the sample pool.

7. The oil in water detection system according to any one of claims 1 to 6, characterized in that: The oil in water detection system also includes a monitoring unit.

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