Defoamer, oil in water detection pretreatment system and oil in water detection system

Abstract

The present invention proposes a defoamer, an oil-in-water detection pretreatment system and an oil-in-water detection system using the defoamer, the defoamer comprises a shell and a liquid inlet pipe, a defoaming cavity is formed in the shell, the shell is provided with a liquid outlet and an air outlet connecting the defoaming cavity and the outside, the air outlet is located above the liquid 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, the tube wall of the liquid inlet pipe is provided with a plurality of penetration holes, the aperture of the penetration holes is smaller than the diameter of the liquid inlet pipe. The technical solution of the present application can improve the detection accuracy of the oil content in water.

Description

Technical Field

[0001] The invention relates to the field of detection technology, and in particular to a defoamer, an oil-in-water detection pretreatment system using the defoamer, 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 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. At present, the commonly used method for oil concentration in water is mostly sampling analysis, but the actual production water samples often contain a large number of bubbles, which affects the accuracy of the test results. Summary of the invention

[0003] The main purpose of the present invention is to provide a defoamer, an oil-in-water detection pretreatment system using the defoamer and an oil-in-water detection system, aiming to improve the detection accuracy of the oil content in water.

[0004] To achieve the above object, the present invention provides a defoamer, comprising:

[0005] 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

[0006] 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.

[0007] In one embodiment of the defoamer 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.

[0008] In one embodiment of the defoamer of the present invention, the defoamer further comprises 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.

[0009] In one embodiment of the defoamer of the present invention, a sewage outlet connected to the outside is opened on the bottom wall of the defoaming chamber.

[0010] In one embodiment of the defoamer of the present invention, the bottom wall of the defoaming chamber is a concave arc surface, and the sewage outlet is opened at the lowest point of the bottom wall.

[0011] In one embodiment of the defoamer of the present invention, the plurality of permeation holes are sequentially arranged along the length direction of the liquid inlet pipe.

[0012] In one embodiment of the defoamer of the present invention, a liquid discharge port is provided at one end of the liquid inlet pipe inserted into the defoaming chamber.

[0013] The present invention also provides an oil-in-water detection pretreatment system, comprising the defoamer described in any one of the above items.

[0014] In one embodiment of the oil-in-water detection pretreatment system of the present invention, the oil-in-water detection pretreatment system further comprises a steam generator, and the steam generator is connected to the defoaming chamber of the defoamer to clean the defoamer.

[0015] The present invention further provides an oil-in-water detection system, comprising a detection device and the oil-in-water detection pretreatment system described in any one of the above items, wherein the detection device is connected to a sample liquid outlet of the oil-in-water detection pretreatment system.

[0016] The present invention proposes a defoamer, which introduces a sample liquid into a defoaming chamber of a shell through a 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 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, avoiding 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 regenerate bubbles. That is, before the sample liquid is tested, the sample liquid is pre-treated by the defoamer of the present invention, so that the bubbles in the extracted sample liquid can be eliminated to improve the detection accuracy of the oil content in water. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 It is a structural diagram of an embodiment of the oil-in-water detection system of the present invention;

[0019] Figure 2 It is a structural diagram of another embodiment of the oil in water detection system of the present invention;

[0020] Figure 3 It is a structural diagram of the defoamer of the present invention.

[0021] Description of Figure Numbers:

[0022] Label name Label name 1000 Oil in Water Detection System 13 Bezel 100 Oil in water detection pretreatment system 14 Liquid outlet pipe 10 Defoamer 20 Steam generator 11 case 30 Filter components 111 Defoaming chamber 31 Filters 112 Liquid outlet 40 mixer 113 Air outlet 50 Sample pool 114 Sewage outlet 200 Detection device 12 Liquid inlet pipe 210 Analyzer 121 Permeable holes 220 Probe 122 drain port 300 Monitoring unit

[0023] 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

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] The present invention provides a defoamer 10 .

[0029] Please refer to Figure 3 In some embodiments of the defoamer 10 of the present invention, the defoamer 10 comprises:

[0030] A shell 11, wherein a defoaming cavity 111 is formed in the shell 11, and the shell 11 is provided with a liquid outlet 112 and an air outlet 113 communicating with the defoaming cavity 111 and the outside, wherein the air outlet 113 is located above the liquid outlet 112; and

[0031] The liquid inlet pipe 12 is inserted into the defoaming cavity 111 from the top of the shell 11 and extends downward along the height direction of the shell 11. The tube wall of the liquid inlet pipe 12 is provided with a plurality of penetration holes 121, and the aperture of the penetration holes 121 is smaller than the tube diameter of the liquid inlet pipe 12.

[0032] The defoamer 10 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 10 includes a shell 11 as a bearing base and a liquid inlet pipe 12 inserted in the shell 11, a defoaming cavity 111 is formed in the shell 11, the liquid inlet pipe 12 is inserted in the defoaming cavity 111 from the top wall of the defoaming cavity 111, and extends downward along the height direction of the shell 11, and a plurality of penetration holes 121 are opened on the side wall of the liquid inlet pipe 12, and the aperture of the penetration hole 121 is smaller than the tube diameter of the liquid inlet pipe 12. At this time, when the sample liquid passes through the liquid inlet pipe 12, the sample liquid penetrates into the defoaming cavity 111 from the penetration hole 121, and bubbles larger than the aperture of the penetration hole 121 cannot pass through the penetration hole 121 and will directly burst, thereby eliminating the bubbles in the sample liquid. After the sample liquid enters the defoaming chamber 111 through the liquid inlet pipe 12, it flows out from the liquid outlet 112 opened on the shell 11 for subsequent processing or direct detection, and the gas overflowed after the bubble bursts overflows from the gas outlet 113 opened on the shell 11, thereby preventing the gas from remaining in the defoaming chamber 111, resulting in excessive air pressure in the defoaming chamber 111 and causing the sample liquid in the defoaming chamber 111 to re-generate bubbles.

[0033] Therefore, it can be understood that the present invention proposes a defoamer 10, which introduces the sample liquid into the defoaming chamber 111 of the shell 11 through the liquid inlet pipe 12. When the sample liquid flows through the liquid inlet pipe 12, it will seep out from the penetration hole 121 on the side wall of the liquid inlet pipe 12, and the bubbles larger than the aperture of the penetration hole 121 cannot pass through the penetration hole 121, 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 113 of the shell 11, avoiding the gas remaining in the defoaming chamber 111, resulting in excessive air pressure in the defoaming chamber 111, and causing the sample liquid in the defoaming chamber 111 to regenerate bubbles. That is, before the sample liquid is tested, the sample liquid can be pre-treated by the defoamer 10 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.

[0034] Please refer to Figure 3 In some embodiments of the defoamer 10 of the present invention, the liquid outlet 112 is opened on the side wall of the defoaming chamber 111 and is spaced apart from the bottom wall of the defoaming chamber 111.

[0035] In this embodiment, the liquid outlet 112 is provided on the side wall of the defoaming chamber 111 and is spaced from the bottom wall of the defoaming chamber 111. At this time, when the sample liquid enters the defoaming chamber 111 through the liquid inlet pipe 12, the sample liquid is first deposited in the defoaming chamber 111 until the height of the sample liquid reaches the height of the liquid outlet 112 and then flows out from the liquid outlet 112. In this way, the sample liquid is precipitated in the defoaming chamber 111, and the impurities in the sample liquid are deposited in the defoaming chamber 111, 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 112, so that the outflow speed of the sample liquid is uniform.

[0036] Please refer to Figure 3 In some embodiments of the defoamer 10 of the present invention, the defoamer 10 further includes a baffle 13, which is disposed in the defoaming chamber 111 and is horizontally separated between the liquid inlet pipe 12 and the liquid outlet 112, and the baffle 13 is spaced apart from the bottom wall of the defoaming chamber 111.

[0037] In this embodiment, a baffle 13 is provided in the defoaming chamber 111, and the baffle 13 is horizontally separated from the liquid inlet pipe 12 and the liquid outlet 112. On the one hand, it prevents the sample liquid from being directly sprayed toward the liquid outlet 112 due to excessive pressure in the liquid inlet pipe 12 when the sample liquid flows out from the penetration hole 121; on the other hand, since the sample liquid will overflow only after the defoaming chamber 111 reaches the height of the liquid outlet hole after entering the defoaming chamber 111, and the sample liquid seeps out from multiple penetration holes 121 at the same time, it is easy for the sample liquid in the defoaming chamber 111 to generate a vortex and stir the impurities deposited in the bottom wall. At this time, the liquid inlet pipe 12 and the liquid outlet 112 are separated by the baffle 13, so that the defoaming chamber 111 is divided into spaces on both sides of the liquid inlet pipe 12 and the liquid outlet 112, thereby preventing the vortex induced on one side of the liquid inlet pipe 12 from affecting the sample liquid on the side of the liquid outlet 112, avoiding affecting the outflow of the sample liquid, and avoiding impurities being stirred and flowing out with the sample liquid.

[0038] Please refer to Figure 3 In some embodiments of the defoamer 10 of the present invention, a sewage outlet 114 connected to the outside is opened on the bottom wall of the defoaming chamber 111.

[0039] In this embodiment, a sewage outlet 114 connected to the outside is opened on the bottom wall of the defoaming chamber 111. It can be understood that when the sample liquid enters the defoaming chamber 111 through the liquid inlet pipe 12, the sample liquid is first deposited in the defoaming chamber 111 until the height of the sample liquid reaches the height of the liquid outlet 112 and then flows out from the liquid outlet 112. Such a configuration allows the sample liquid to be precipitated in the defoaming chamber 111, so that impurities in the sample liquid are deposited in the defoaming chamber 111. At this time, the defoaming chamber 111 can be cleaned as needed, and the impurities can be discharged from the sewage outlet 114 to avoid impurities accumulating in the defoaming chamber 111 and blocking the liquid inlet pipe 12 and the liquid outlet 112.

[0040] Please refer to Figure 3 In some embodiments of the defoamer 10 of the present invention, the bottom wall of the defoaming chamber 111 is recessed toward the side away from the top wall, and the sewage outlet 114 is opened at the lowest point of the bottom wall.

[0041] In this embodiment, the bottom wall of the defoaming chamber 111 is recessed toward the side away from the top wall, and the drain outlet 114 is opened at the lowest point of the bottom wall. This arrangement allows impurities in the sample liquid to directly enter the drain outlet 114 along the bottom wall, so that the impurities can be completely discharged and avoid impurities remaining in the defoaming chamber 111.

[0042] Please refer to Figure 3 In some embodiments of the defoamer 10 of the present invention, a liquid discharge port 122 is provided at one end of the liquid inlet pipe 12 inserted into the defoaming chamber 111 .

[0043] In the present embodiment, a liquid discharge port 122 is provided at one end of the liquid inlet pipe 12 inserted into the defoaming chamber 111. Such a configuration allows impurities that cannot seep out of the permeation hole 121 to flow out from the liquid discharge port 122 and be deposited on the bottom wall of the defoaming chamber 111. At the same time, part of the sample liquid can flow out through the liquid discharge port 122, thereby preventing the sample liquid from being not removed from the permeation hole 121 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.

[0044] Please refer to Figure 3 In some embodiments of the defoamer 10 of the present invention, the defoamer 10 further includes a liquid outlet pipe 14 , and the liquid outlet pipe 14 is inserted into the defoaming chamber 111 from the liquid outlet 112 .

[0045] In this embodiment, the defoamer 10 further includes a liquid outlet pipe 14 , which is inserted into the defoaming cavity 111 from the liquid outlet 112 . In this way, the liquid outlet position of the defoamer 10 can be flexibly set.

[0046] Please refer to Figure 1 and Figure 2 The present invention further proposes an oil-in-water detection pretreatment system 100, comprising a defoamer 10 in any of the aforementioned embodiments. The specific structure of the defoamer 10 refers to the aforementioned embodiments and will not be described in detail here. Since the oil-in-water detection pretreatment system 100 proposed in the present application applies all the technical solutions of all the aforementioned embodiments, it at least has all the beneficial effects brought by all the aforementioned technical solutions, which will not be described in detail here.

[0047] In some embodiments, the oil in water detection pretreatment system 100 also includes a sampling and filtering device, which includes a sampling tube and a filter assembly 30. The sampling tube is connected to the inlet of the filter assembly 30, and the outlet of the filter assembly 30 is connected to the liquid inlet of the defoamer 10. The sampling tube is inserted into the sea to extract production water sample liquid and transport it to the filter assembly 30 to filter impurities, and then the sample liquid after impurities are filtered out is transported to the defoamer 10 for defoaming treatment. With this arrangement, impurities in the sample liquid entering the defoamer 10 can be reduced, and impurities can be prevented from being deposited on the wall of the liquid inlet pipe 12 to block the penetration hole 121 and hinder the seepage of the sample liquid; at the same time, removing impurities in the sample liquid can reduce the generation of bubbles during the flow of the sample liquid.

[0048] Further, in some embodiments of the oil in water detection pretreatment system 100 of the present invention, the filter assembly 30 includes:

[0049] Two filters 31, the two filters 31 are arranged in parallel;

[0050] A first switch structure, wherein the second switch structure is disposed at the inlet end of the filter assembly 30 to control the communication between the sampling tube and the inlet of one of the filters 31; and

[0051] The second switch structure is disposed at the outlet end of the filter assembly 30 to control the outlet of the filter 31 connected to the sampling tube to be connected to the defoamer 10 .

[0052] In this embodiment, two filters 31 are connected in parallel in the filter assembly 30, and a first switch structure and a second switch structure are respectively provided at the inlet and outlet ends of the filter assembly 30, so that one of the filters 31 is connected between the sampling tube and the defoamer 10 to filter the sample liquid; at this time, the other filter 31 is in an idle state, and the idle filter 31 can be cleaned and maintained. That is, the technical solution of this embodiment is to form a filter assembly 30 by two parallel filters 31, so that when one of the filters 31 is damaged or too dirty, the other filter 31 can be enabled, so that the oil in water detection system 1000 can continue to operate, avoiding interruption of the detection process due to cleaning and maintenance of the filter 31, thereby ensuring the continuity of the oil content in water monitoring process and timely discovering the problem of excessive oil.

[0053] Please refer to Figure 1 In some embodiments of the oil-in-water detection pretreatment system 100 of the present invention, the first 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 inlets of the two filters 31, and the three-way valve is used to control the sampling tube to be connected to the inlet of one of the filters 31;

[0054] In this embodiment, the first switch structure 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, the inlets of the sampling tube and the two filters 31 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 and the two filters 31. The three-way valve is mostly suitable for manual control, so that the user can select the filter 31 according to their needs.

[0055] Please refer to Figure 2 In some embodiments, the first switch structure includes two first control valves, each of which is arranged between an inlet of the filter 31 and the sampling tube to control the connection between the corresponding filter 31 and the sampling tube.

[0056] In this embodiment, the first switch structure includes two first control valves, each of which is disposed between the inlet of a filter 31 and the sampling tube, and one of the filters 31 is connected to the sampling tube 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.

[0057] Please refer to Figure 1 and Figure 2 In some embodiments of the oil in water detection system 1000 of the present invention, the second switch structure includes two second control valves, each of which is arranged between the outlet of the filter 31 and the defoamer 10 to control the connection between the outlet of the corresponding filter 31 and the defoamer 10.

[0058] In this embodiment, the second switch structure includes two second control valves, each of which is disposed between the outlet of a filter 31 and the defoamer 10, and one of the filters 31 is connected to the sampling tube 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.

[0059] In some embodiments, the oil in water detection pretreatment system 100 also includes a mixer 40, which is arranged downstream of the defoamer 10 to fully mix the sample liquid after defoaming by the defoamer 10, so that the components in the sample liquid are evenly mixed to improve the detection accuracy.

[0060] Please refer to Figure 1 and Figure 2 In the oil-in-water detection pretreatment system 100 of the present invention, the oil-in-water detection pretreatment system 100 further includes a steam generator 20 , and the steam generator 20 is connected to the defoamer 10 to clean the defoamer 10 .

[0061] In this embodiment, by setting the steam generator 20, high-temperature steam can be generated and poured into the defoaming chamber 111 of the defoamer 10. When the steam enters the defoaming chamber 111 and flows through the liquid inlet pipe 12 and the liquid outlet 112, the cavity wall of the defoaming chamber 111 and the tube wall of the liquid inlet pipe 12 can be flushed and cleaned to keep the defoamer 10 clean and ensure its defoaming effect. The defoamer 10 is cleaned by steam in order to increase the solubility of oil by using high-temperature steam. It is understandable that when the sample liquid passes through the defoamer 10, part of the oil carried in the sample liquid will inevitably be contaminated on the cavity wall of the defoaming chamber 111 and the tube wall of the liquid inlet pipe 12. The high-temperature steam can increase the solubility of the oil so that the oil stains on the cavity wall of the defoaming chamber 111 and the tube wall of the liquid inlet pipe 12 fall off quickly, thereby improving the cleaning effect and cleaning efficiency.

[0062] In some embodiments, the oil in water detection pretreatment system 100 further includes a filter assembly 30 and a mixer 40. In this case, the steam generator 20 can be connected to the filter assembly 30 and the mixer 40 respectively to clean the filter assembly 30 and the mixer 40 respectively.

[0063] Please refer to Figure 1 and Figure 2 The present invention also proposes an oil-in-water detection system 1000, which includes a detection device 200 and the oil-in-water detection pretreatment system 100 described in any of the above embodiments, and the detection device 200 is connected to the sample liquid outlet of the oil-in-water detection pretreatment system 100 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, or a non-contact ultraviolet fluorescence oil-in-water online detector or an infrared oil-in-water sensor.

[0064] Preferably, the ultraviolet fluorescence oil-in-water online analyzer 210 is used to detect the oil content in the sample liquid. Specifically, the sample pool 50 is also provided in the oil-in-water detection pretreatment system 100, and the sample pool 50 is connected to the liquid outlet 112 of the defoamer 10 to receive the sample liquid after pretreatment. At this time, the probe 220 of the ultraviolet fluorescence oil-in-water online analyzer 210 is set toward the sample liquid in the sample pool 50, and irradiates ultraviolet light to the sample liquid. 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 oil-in-water online 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. And it can avoid that the probe 220 directly contacts the sample liquid and is contaminated with oil and impurities, affecting the detection effect.

[0065] In some embodiments, the oil in water detection system 1000 further includes a monitoring unit 300 to monitor and control the working status of each module in the oil in water detection system 1000 to improve the degree of automation.

[0066] 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.

[0067] 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 defoamer, characterized in that: include: A shell, wherein a defoaming cavity is formed in the shell, and the shell is provided with a liquid outlet and an air outlet connecting the defoaming cavity and the outside, the air outlet is located above the liquid outlet, the liquid outlet is provided on the side wall of the defoaming cavity, and is spaced from the bottom wall of the defoaming cavity, and the bottom wall of the defoaming cavity is provided with a sewage outlet connected to the outside; A liquid inlet pipe, 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 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 diameter of the liquid inlet pipe; The baffle is arranged in the defoaming cavity and is horizontally separated between the liquid inlet pipe and the liquid outlet. The baffle is spaced apart from the bottom wall of the defoaming cavity.

2. The defoamer according to claim 1, characterized in that: The bottom wall of the defoaming chamber is a concave arc surface, and the sewage outlet is opened at the lowest point of the bottom wall.

3. The defoamer according to claim 1, characterized in that: The plurality of permeation holes are arranged in sequence along the length direction of the liquid inlet pipe.

4. The defoamer according to any one of claims 1 to 3, characterized in that: One end of the liquid inlet pipe inserted in the defoaming cavity is provided with a liquid discharge port.

5. A pretreatment system for oil in water detection, characterized in that: A defoamer comprising the defoamer according to any one of claims 1 to 4.

6. The oil in water detection pretreatment system according to claim 5, characterized in that: The oil-in-water detection pretreatment system further comprises a steam generator, which is communicated with the defoaming chamber of the defoamer to clean the defoamer.

7. An oil in water detection system, characterized in that: It comprises a detection device and the oil in water detection pretreatment system as claimed in claim 5 or 6.

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