Oil in water detection pretreatment system and oil in water detection system

Abstract

The present invention proposes an oil-in-water detection pretreatment system and an oil-in-water detection system, wherein the sampling and filtering system comprises a sampling tube; a filter, wherein the filter is provided with two filters, the two filters are arranged in parallel, and the liquid inlets of the two filters are both connected to the sampling tube; and a switch structure, wherein the switch structure is arranged between the sampling tube and the liquid inlets of the two filters to control the sampling tube to be connected to the liquid inlet of one of the filters. The technical solution of the present application can ensure the continuity of the sample liquid sampling process.

Description

Technical Field

[0001] The invention relates to the technical field of offshore oil exploitation, and in particular to an oil-in-water detection pretreatment system and 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 national regulatory 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") discharged into the sea remains below the regulatory level. Currently, the commonly used method for detecting oil concentration in water is mostly sampling and analysis. Since the extracted production water samples contain impurities, the sample liquid is often directly filtered and pre-treated when the sample liquid is extracted. After long-term use, impurities accumulate in the filter, and the filter needs to be cleaned or replaced, resulting in interruption of the pretreatment process, and it is impossible to continuously take samples to monitor the oil content in the sample liquid. Summary of the invention

[0003] The main purpose of the present invention is to provide an oil-in-water detection pretreatment system and an oil-in-water detection system using the oil-in-water detection pretreatment system, aiming to ensure the continuity of the sample liquid sampling process.

[0004] To achieve the above object, the present invention proposes a pretreatment system for oil in water detection, comprising:

[0005] Sampling tube;

[0006] A filter, wherein two filters are provided, the two filters are arranged in parallel, and the liquid inlets of the two filters are both connected to the sampling tube;

[0007] A switch structure is provided between the sampling tube and the liquid inlets of the two filters to control the communication between the sampling tube and the liquid inlet of one of the filters.

[0008] In one embodiment of the oil in water detection pretreatment system of the present invention, the filter comprises:

[0009] a housing having a receiving cavity formed therein; and

[0010] A filter element, the filter element is arranged in the accommodating cavity, and a filter cavity is formed in the filter element;

[0011] Wherein, the shell is provided with a liquid inlet communicated with the filter cavity and a liquid outlet communicated with the external space of the filter element.

[0012] In one embodiment of the oil-in-water detection pretreatment system of the present invention, the filter element comprises:

[0013] A filter screen, the filter screen is arranged around the circumference of the shell to enclose a cylindrical structure, the cylindrical structure is supported between the bottom wall and the top wall of the shell, the filter cavity is formed in the cylindrical structure, the liquid inlet is opened on the bottom wall of the shell and communicates with an end of the cylindrical structure facing the bottom wall; and

[0014] The filter material is arranged in the filter cavity to absorb impurities in the sample liquid.

[0015] In one embodiment of the oil-in-water detection pretreatment system of the present invention, the filter material is an oleophobic filter material.

[0016] In one embodiment of the oil-in-water detection pretreatment system of the present invention, a sewage outlet is provided on the top wall of the shell, and the sewage outlet is communicated with an end of the cylindrical structure facing the top wall of the shell.

[0017] In one embodiment of the oil in water detection pretreatment system of the present invention, the plane where the end opening of the sampling tube facing away from the shell is located is arranged at an angle with the axis of the sampling tube, and the angle α satisfies 140°≤α≤160°.

[0018] In one embodiment of the oil-in-water detection pretreatment system of the present invention, the switch structure is a three-way valve, the inlet of the three-way valve is connected to the sampling tube, and the two outlets of the three-way valve are respectively connected to the liquid inlets of the two filters;

[0019] Alternatively, the switch structure includes two first control valves, each of which is disposed between a liquid inlet of the filter and the sampling tube to control the connection between the corresponding filter and the sampling tube.

[0020] In one embodiment of the oil-in-water detection pretreatment system of the present invention, the oil-in-water detection pretreatment system further comprises two second control valves, each of which is disposed at a liquid outlet of the filter to control the opening and closing of the corresponding liquid outlet of the filter.

[0021] In one embodiment of the oil-in-water detection pretreatment system of the present invention, the oil-in-water detection pretreatment system further comprises:

[0022] a steam generator, the steam generator being communicated with the two filters respectively; and

[0023] The third control valve is provided with two third control valves, each of which is provided between one of the filters and the steam generator to control the on-off between the corresponding filter and the steam generator.

[0024] The present invention also provides an oil-in-water detection system, comprising a detection device and the oil-in-water detection pretreatment system as described in any one of the above items.

[0025] In the oil-in-water detection pretreatment system of the present invention, two filters are arranged in parallel, and the sampling tube is controlled to communicate with the inlet of one of the filters through a switch structure, so that when one of the filters needs maintenance or cleaning, the filter is switched through the switch structure, so that the sample liquid extracted by the sampling tube flows into the other filter for filtration. That is, the technical solution of the present invention avoids the interruption of the sampling process due to cleaning or maintenance of the filter through the arrangement of two parallel filters, thereby ensuring the continuity of the sample liquid sampling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 It is a structural diagram of an embodiment of the oil-in-water detection system of the present invention;

[0028] Figure 2 It is a structural diagram of another embodiment of the oil in water detection system of the present invention;

[0029] Figure 3 It is a structural diagram of an embodiment of the oil in water detection pretreatment system of the present invention.

[0030] Description of Figure Numbers:

[0031]

[0032]

[0033] 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

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The present invention provides a pre-processing system 100 for oil-in-water detection.

[0039] Please refer to Figures 1 to 3 In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, the oil-in-water detection pretreatment system 100 includes:

[0040] Sampling tube 10;

[0041] A filter 20, wherein two filters 20 are provided, and the two filters 20 are arranged in parallel, and the liquid inlets 212 of the two filters 20 are both connected to the sampling tube 10;

[0042] The switch structure 30 is disposed between the sampling tube 10 and the liquid inlets 212 of the two filters 20 to control the communication between the sampling tube 10 and the liquid inlet 212 of one of the filters 20 .

[0043] In this embodiment, two filters 20 are connected in parallel in the filter assembly, and switch structures 30 are respectively provided at the inlet and outlet ends of the filter assembly. The switch structure 30 controls one of the filters 20 to communicate with the sampling tube 10 to receive the sample liquid extracted by the sampling tube 10 for filtering; at this time, the other filter 20 is in an idle state, and the idle filter 20 can be cleaned and maintained. The technical solution of this embodiment, through two parallel filters 20 to form a filter assembly, can enable the other filter 20 when one of the filters 20 is damaged or too dirty, so that the oil in water detection system 1000 can continue to operate, avoiding the interruption of the detection process due to cleaning and maintenance of the filter 20, thereby ensuring the continuity of the oil content monitoring process in water and timely discovering the problem of excessive oil.

[0044] Therefore, it can be understood that in the oil-in-water detection pretreatment system 100 of the present invention, two filters 20 are arranged in parallel, and the sampling tube 10 is controlled to communicate with the inlet of one of the filters 20 through the switch structure 30, so that when one of the filters 20 needs maintenance or cleaning, the filter 20 is switched through the switch structure 30, so that the sample liquid extracted by the sampling tube 10 flows into the other filter 20 for filtration. That is, the technical solution of the present invention avoids the interruption of the sampling process due to cleaning or maintenance of the filter 20 through the arrangement of two parallel filters 20, thereby ensuring the continuity of the sample liquid sampling process.

[0045] Please refer to Figure 3 In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, the filter 20 comprises:

[0046] A housing 21 having a receiving cavity 211 formed therein; and

[0047] A filter element 22, wherein the filter element 22 is disposed in the accommodating cavity 211, and a filter cavity 223 is formed in the filter element 22;

[0048] The housing 21 is provided with a liquid inlet 212 communicating with the filter cavity 223 and a liquid outlet communicating with the external space of the filter element 22 .

[0049] The filter 20 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 20 proposed in the present invention includes a shell 21 as an installation base, a mounting cavity is formed in the shell 21, and a filter element 22 is arranged in the mounting cavity, a filter cavity 223 is formed in the filter element 22, and the filter cavity 223 has an inlet and an outlet, and the inlet of the filter cavity 223 is connected to the liquid inlet 212 of the shell 21. At this time, the production water sample liquid is drawn in from the liquid inlet 212, filtered by the filter element 22, and then infiltrates into the mounting cavity from the outlet of the filter cavity 223 and flows out from the liquid outlet, so that the sample liquid can be detected later.

[0050] Please refer to Figure 3 In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, the filter element 22 includes:

[0051] a filter screen 221, the filter screen 221 is arranged around the circumference of the housing 21 to enclose a cylindrical structure, the cylindrical structure is supported between the bottom wall and the top wall of the housing 21, the filter chamber 223 is formed in the cylindrical structure, the liquid inlet 212 is opened on the bottom wall of the housing 21 and communicates with one end of the cylindrical structure facing the bottom wall; and

[0052] The filter material 222 is disposed in the filter cavity 223 to absorb impurities in the sample liquid.

[0053] In this embodiment, the filter element 22 is extended from the bottom wall to the top wall of the housing 21, and an inlet connected to the filter chamber 223 is provided at one end of the filter element 22 close to the bottom wall, and the liquid inlet 212 of the housing 21 is provided on the bottom wall to communicate with the inlet of the filter chamber 223. Specifically, the filter element 22 includes a filter screen 221 and a filter material 222, the filter screen 221 is arranged in the installation cavity and is arranged around the circumference of the housing 21 to form a cylindrical structure, the cylindrical structure is extended from the bottom wall to the top wall of the housing 21, and a filter chamber 223 is formed in the cylindrical structure, and the filter material 222 is arranged in the filter chamber 223 to absorb impurities in the sample liquid. At this time, after the production water sample liquid enters the filter chamber 223, the impurities are adsorbed on the filter material 222, and the sample liquid seeps out from the penetration holes on the filter screen 221, so as to prevent the impurities from clogging the penetration holes and affecting the outflow of the sample liquid.

[0054] In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, the filter material 222 is an oleophobic filter material 222 .

[0055] In this embodiment, the filter material 222 is made of oleophobic material, which can prevent the oil in the sample liquid from being adsorbed on the filter material 222, so that the oil in the sample liquid seeps out from the penetration holes, thereby preventing the oil content in the water from being reduced due to the adsorption of oil by the filter material 222, thereby affecting the detection result of the oil content in the water.

[0056] Please refer to Figure 3 In some embodiments of the oil in water detection pretreatment system 100 of the present invention, a sewage outlet 214 is opened on the top wall of the shell 21, and the sewage outlet 214 is connected to one end of the cylindrical structure facing the top wall of the shell 21.

[0057] In this embodiment, the top wall of the housing 21 is provided with a drain port 214, and the drain port 214 is connected to the end of the filter element 22 away from the liquid inlet 212. At this time, when the production water sample flows into the filter element 22 from the liquid inlet 212, part of the sample liquid is filtered by the filter element 22 and then seeps out from the permeation hole into the accommodating chamber 211, so as to flow out through the liquid outlet for subsequent detection. The other part of the sample liquid can rinse the filter material 222 and bring out the impurities from the drain port 214, so as to avoid the accumulation of impurities in the filter chamber 223 and affect the filtering effect. Further, in some filters 20, a control valve can be set at the drain port 214 to control the opening and closing of the drain port 214, and the drain port 214 can be opened after a certain working time is preset to clean the filter 20, and the flow rate of the sample liquid seeping out of the permeation hole can be increased when the drain port 214 is closed.

[0058] Please refer to the figure, in some embodiments of the oil in water detection pretreatment system 100 of the present invention, the plane where the opening of the end of the sampling tube 10 facing away from the shell 21 is located is set at an angle with the axis of the sampling tube 10, and the angle α satisfies 140°≤α≤160°.

[0059] In this embodiment, the plane where the opening of the end of the sampling tube 10 that faces away from the shell 21 is located is set at an angle with the axial direction of the sampling tube 10, and the angle α satisfies 140°≤α≤160°. With this arrangement, when the sampling tube 10 is inserted into the produced water for sampling, the opening of the sampling tube 10 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 10 along with the produced water, thereby reducing the impurities entering the sampling tube 10 and increasing the service life of the filter 20.

[0060] Please refer to Figure 2 and Figure 3 In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, the switch structure 30 is a three-way valve, the inlet of the three-way valve is connected to the sampling tube 10, and the two outlets of the three-way valve are respectively connected to the liquid inlets 212 of the two filters 20, and the three-way valve is used to control the communication between the sampling tube 10 and the inlet of one of the filters 20;

[0061] Alternatively, the switch structure 30 includes two first control valves, each of which is disposed between the liquid inlet 212 of the filter 20 and the sampling tube 10 to control the connection between the corresponding filter 20 and the sampling tube 10 .

[0062] In this embodiment, the switch structure 30 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 switch structure 30, the inlets of the sampling tube 10 and the two filters 20 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 10 and the two filters 20. The three-way valve is mostly suitable for manual control, so that the user can select the filter 20 according to their needs.

[0063] In some embodiments, the switch structure 30 includes two first control valves, each of which is disposed between the inlet of a filter 20 and the sampling tube 10, and one of the filters 20 is connected to the sampling tube 10 by controlling the on-off state of the two first control valves. The first control valves can be controlled manually or by a control system according to a preset program, which is not specifically limited here.

[0064] Please refer to Figures 1 to 3 In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, the oil-in-water detection pretreatment system 100 also includes two second control valves 40, each of the second control valves 40 is arranged at the liquid outlet of one of the filters 20 to control the opening and closing of the corresponding liquid outlet of the filter 20.

[0065] In this embodiment, the oil-in-water detection pretreatment system 100 further includes two second control valves 40, each of which is disposed between the outlet of a filter 20 and the defoaming device, and the corresponding filter 20 is connected to the sampling tube 10 by controlling the on-off state of the two second control valves 40, and the switch structure 30 and the second control valve 40 are controlled in linkage, that is, the liquid inlet 212 and the liquid outlet of the same filter 20 are in an open state, while the liquid inlet 212 and the liquid outlet of the other filter 20 are in a closed state, so that one filter 20 filters the sample liquid, and the other filter 20 is idle, and the sample liquid filtered by the filter 20 is prevented from flowing back to the idle filter 20. Among them, the second control valve 40 can also be controlled manually or by the control system according to a preset program, which is not specifically limited here.

[0066] Please refer to Figure 1 and Figure 2 In some embodiments of the oil in water detection pretreatment system 100 of the present invention, the sampling and filtering system further comprises:

[0067] A steam generator 50, wherein the steam generator 50 is respectively connected to the liquid outlets of the two filters 20; and

[0068] The third control valve is provided with two third control valves, each of which is provided between one of the liquid outlets and the steam generator 50 to control the connection and disconnection between the corresponding liquid outlet and the steam generator 50 .

[0069] In this embodiment, the sampling and filtering system further includes a steam generator 50 and a third control valve. The steam generator 50 is connected to each filter 20 to generate steam to clean the filter 20. At the same time, a third control valve is provided between the steam generator 50 and the liquid outlets of the two filters 20 to control the steam generator 50 to be connected to one of the liquid outlets to clean the filter 20. The provision of the steam generator 50 can increase the solubility of the oil by utilizing the high temperature environment, so that the oil can be quickly separated from the filter 20, thereby improving the cleaning effect and cleaning efficiency.

[0070] In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, the oil-in-water detection pretreatment system 100 further includes a defoamer 60, which is disposed between the sampling and filtering system and the detection device 200 to perform defoaming treatment on the filtered sample liquid to remove bubbles in the sample liquid and improve the detection accuracy. At the same time, the defoamer 60 is disposed after the filtering system, and most of the impurities in the sample liquid can be removed by the filtering system, thereby reducing the generation of bubbles during the flow of the sample liquid.

[0071] Further, in some embodiments of the oil in water detection pretreatment system 100 of the present invention, the defoamer 60 includes:

[0072] A shell, wherein a defoaming cavity is formed in the shell, and the shell is provided with a liquid outlet and an air outlet communicating with the defoaming cavity and the outside, and the air outlet is located above the liquid outlet; and

[0073] 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 tube 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 tube diameter of the liquid inlet pipe.

[0074] The defoamer 60 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 the measurement. Specifically, the defoamer 60 includes a shell as a bearing base and a liquid inlet pipe inserted in the shell, a defoaming cavity is formed in the shell, the liquid inlet pipe is inserted in the defoaming cavity from the top wall of the defoaming cavity, and extends downward along the height direction of the shell, and a plurality of penetration holes are opened on the side wall of the liquid inlet pipe, and the aperture of the penetration hole is smaller than the diameter of the liquid inlet pipe. At this time, when the sample liquid passes through the liquid inlet pipe, the sample liquid penetrates into the defoaming cavity from the penetration hole, and bubbles larger than the aperture of the penetration hole cannot pass through the penetration hole and will burst directly, thereby eliminating the bubbles in the sample liquid. After the sample liquid enters the defoaming chamber through the liquid inlet pipe, it flows out from the liquid outlet opened on the shell for subsequent processing or direct detection, and the gas overflowed after the bubble bursts overflows from the gas outlet opened on the shell, avoiding the gas remaining in the defoaming chamber, resulting in excessive air pressure in the defoaming chamber, and causing the sample liquid in the defoaming chamber to re-generate bubbles.

[0075] The defoamer 60 in the oil-in-water detection system 1000 of the present invention introduces the sample liquid into the defoaming chamber of the shell through the liquid inlet pipe. When the sample liquid flows through the liquid inlet pipe, it will seep out from the penetration holes on the side wall of the liquid inlet pipe, and the bubbles larger than the aperture of the penetration holes cannot pass through the penetration holes 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 of the shell to avoid the gas remaining in the defoaming chamber causing excessive air pressure in the defoaming chamber and causing the sample liquid in the defoaming chamber to generate bubbles again. That is, before the sample liquid is detected, the sample liquid is pre-treated by the defoamer 60 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.

[0076] In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, the liquid outlet is opened on the side wall of the defoaming chamber and is spaced apart from the bottom wall of the defoaming chamber.

[0077] In this embodiment, the liquid outlet is provided on the side wall of the defoaming chamber and is spaced from the bottom wall of the defoaming chamber. At this time, when the sample liquid enters the defoaming chamber through the liquid inlet pipe, the sample liquid is first deposited in the defoaming chamber 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, and the impurities in the sample liquid are deposited in the defoaming chamber, 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.

[0078] In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, the defoamer 60 also includes a baffle, which is arranged in the defoaming chamber and is horizontally separated between the liquid inlet pipe and the liquid outlet, and the baffle is spaced apart from the bottom wall of the defoaming chamber.

[0079] In the present embodiment, a baffle is provided in the defoaming chamber, and the baffle is disposed horizontally between the liquid inlet pipe 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 when the sample liquid flows out from the penetration hole; on the other hand, since the sample liquid will overflow only after the defoaming chamber reaches the height of the liquid outlet hole after entering the defoaming chamber, and the sample liquid seeps out from multiple penetration holes at the same time, it is easy for the sample liquid in the defoaming chamber to generate vortexes and stir the impurities deposited in the bottom wall. At this time, the liquid inlet pipe and the liquid outlet are separated by the baffle, so that the defoaming chamber is divided into spaces on both sides of the liquid inlet pipe and the liquid outlet, thereby preventing the vortex induced on one side of the liquid inlet pipe 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.

[0080] In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, a sewage outlet connected to the outside is opened on the bottom wall of the defoaming chamber.

[0081] In the present embodiment, a sewage outlet connected to the outside is opened on the bottom wall of the defoaming chamber. It can be understood that when the sample liquid enters the defoaming chamber through the liquid inlet pipe, the sample liquid is first deposited in the defoaming chamber 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, so that impurities in the sample liquid are deposited in the defoaming chamber. At this time, the defoaming chamber can be cleaned as needed, and the impurities can be discharged from the sewage outlet to avoid impurities accumulating in the defoaming chamber and clogging the liquid inlet pipe and the liquid outlet.

[0082] In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, the bottom wall of the defoaming chamber is recessed toward the side away from the top wall, and the sewage outlet is opened at the lowest point of the bottom wall.

[0083] In this embodiment, the bottom wall of the defoaming chamber is recessed toward the side away from the top wall, and the sewage outlet is opened at the lowest point of the bottom wall. This arrangement allows impurities in the sample liquid to directly enter the sewage outlet along the bottom wall, so that the impurities can be completely discharged and impurities are prevented from remaining in the defoaming chamber.

[0084] In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, a liquid discharge port is provided at one end of the liquid inlet pipe inserted into the defoaming chamber.

[0085] In the present embodiment, a liquid discharge port is provided at one end of the liquid inlet pipe inserted into the defoaming chamber. With such a configuration, impurities that cannot seep out of the penetration hole can flow out from the liquid discharge port to be deposited on the bottom wall of the defoaming chamber. At the same time, part of the sample liquid can flow out through the liquid discharge port, thereby preventing the sample liquid from being not removed from the penetration hole 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.

[0086] Please refer to Figure 1 and Figure 2In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, the oil-in-water detection system 1000 further includes a mixer 70 , and the mixer 70 is disposed between the filtering system and the detection device 200 .

[0087] In this embodiment, by providing a mixer 70 in the oil-in-water detection system 1000, the sample liquid can be fully mixed so that the oil is evenly distributed in the sample liquid, thereby improving the detection accuracy of the oil content in water. In some embodiments, the oil-in-water detection system 1000 also includes a defoamer 60, so that the mixer 70 can be provided after the defoamer 60 to perform mixing after defoaming to prevent bubbles in the sample liquid from affecting the distribution of the oil in the sample liquid.

[0088] The present invention also provides an oil-in-water detection system 1000, comprising a detection device 200 and a sampling and filtering system as described in any one of the above items. The detection device 200 is connected to the sample liquid outlet of the filtering system to detect the oil content of the sample liquid after pretreatment such as defoaming in real time. The detection device 200 can be a contact analyzer 210, or a non-contact ultraviolet fluorescence analyzer 210 or an infrared oil-in-water sensor, etc.

[0089] Preferably, the ultraviolet fluorescence analyzer 210 is used to detect the oil content in the water in the sample liquid. Specifically, a sample pool 80 is set in the oil-in-water detection pretreatment system 100 to receive the sample liquid after pretreatment. At this time, the probe 220 of the ultraviolet fluorescence analyzer 210 is set toward the sample liquid and irradiates the sample liquid with ultraviolet light. Aromatic hydrocarbons in petroleum can produce fluorescence under ultraviolet light excitation. At this time, the probe 220 senses the fluorescence intensity generated by the sample liquid, and the control system can calculate the concentration of oil in the sample liquid. In the process of continuous flow of the sample liquid, the ultraviolet fluorescence analyzer 210 also detects and monitors the oil content in the water in real time, 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 phenomenon in the water and timely discover the problem of excessive oil content. At the same time, the probe 220 of the ultraviolet fluorescence analyzer 210 only needs to be set toward the sample liquid without direct contact with the sample liquid, which can prevent the probe 220 from being contaminated with oil and impurities in the sample liquid and affecting the detection effect.

[0090] In some embodiments, the sample pool 80 is provided with a drain port 81;

[0091] And / or, the sample pool 80 is provided with a sampling port 82 .

[0092] In the technical solution of the aforementioned embodiment, a sample pool 80 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 80 is provided with a liquid discharge port 81. It can be understood that the sample pool 80 receives the sample liquid after the aforementioned pretreatment process for detection by the ultraviolet fluorescence analyzer 210. If the sample liquid in the sample pool 80 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 81, so that the sample liquid detected by the ultraviolet fluorescence analyzer 210 is always the sample liquid just extracted, so as to improve the detection accuracy.

[0093] In some embodiments, the sample pool 80 is provided with a sampling port 82 for the user to extract the sample liquid in the sample pool 80 , 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] Furthermore, in some embodiments, the oil in water detection system 1000 further includes a flow meter 90 for detecting the flow rate of the sample liquid in the oil in water detection system 1000 .

[0095] It can be understood that the technical solution of the present application is to continuously extract production water sample liquid to detect and monitor the oil content in the production water sample liquid. In this embodiment, a flow meter 90 is set in the oil-in-water detection system 1000 to detect the sample liquid flow rate in the oil-in-water detection system 1000, 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 210 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] In some embodiments, a monitoring unit 300 is further provided in the oil in water detection system 1000 to monitor the working state of the oil in water detection system 1000 in real time, control the sampling and filtering system to switch the filter 20 according to a preset program, and simultaneously control the steam generator 50 to clean the idle filter 20. Further, the operating state of the entire oil in water detection system 1000 can also be controlled, and the steam generator 50 is connected to the pipeline of the oil in water detection system 1000 to clean each device in the oil in water detection system 1000, so as to prevent impurities and oil from being deposited in the pipeline to affect the circulation of the sample liquid and the detection result of the oil content in the sample liquid.

[0097] Since the oil-in-water detection system 1000 proposed by the present invention includes all the technical solutions in all the aforementioned embodiments, it at least has all the beneficial effects brought by all the aforementioned technical solutions, which are not described one by one here.

[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 pretreatment system for oil in water detection, characterized in that: include: Sampling tube; A filter, wherein two filters are provided, the two filters are arranged in parallel, and the liquid inlets of the two filters are both connected to the sampling tube; A switch structure, the switch structure is arranged between the sampling tube and the liquid inlets of the two filters to control the communication between the sampling tube and the liquid inlet of one of the filters; The filter comprises a housing and a filter element, wherein a receiving cavity is formed in the housing, the filter element is arranged in the receiving cavity, a filter cavity is formed in the filter element, and the housing is provided with a liquid inlet communicating with the filter cavity and a liquid outlet communicating with the external space of the filter element; The filter element comprises a filter screen and a filter material, the filter screen is arranged around the circumference of the shell to enclose a cylindrical structure, the cylindrical structure is supported between the bottom wall and the top wall of the shell, the filter cavity is formed in the cylindrical structure, the liquid inlet is opened on the bottom wall of the shell and communicates with one end of the cylindrical structure facing the bottom wall; the filter material is arranged in the filter cavity to absorb impurities in the sample liquid, and the filter material is an oleophobic filter material; The plane where the opening of one end of the sampling tube facing away from the shell is located is arranged at an angle with the axis of the sampling tube, and the angle α satisfies 140°≤α≤160°.

2. The oil in water detection pretreatment system according to claim 1, characterized in that: A sewage outlet is formed on the top wall of the shell, and the sewage outlet is communicated with one end of the cylindrical structure facing the top wall of the shell.

3. The oil in water detection pretreatment system according to claim 1, characterized in that: The switch structure is a three-way valve, the inlet of the three-way valve is connected to the sampling tube, and the two outlets of the three-way valve are respectively connected to the liquid inlets of the two filters; Alternatively, the switch structure includes two first control valves, each of which is disposed between a liquid inlet of the filter and the sampling tube to control the connection between the corresponding filter and the sampling tube.

4. The oil in water detection pretreatment system according to claim 1, characterized in that: The oil-in-water detection pretreatment system further includes two second control valves, each of which is disposed at a liquid outlet of the filter to control the opening and closing of the corresponding liquid outlet of the filter.

5. The oil in water detection pretreatment system according to any one of claims 1 to 4, characterized in that: The oil in water detection pretreatment system also includes: a steam generator, the steam generator being communicated with the two filters respectively; and The third control valve is provided with two third control valves, each of which is provided between one of the filters and the steam generator to control the on-off between the corresponding filter and the steam generator.

6. An oil in water detection system, characterized in that: The invention comprises a detection device and the oil in water detection pretreatment system as claimed in any one of claims 1 to 5.

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