Dissolved gas demulsification device

Abstract

The utility model belongs to sewage treatment technical field, concretely relates to a kind of dissolved air demulsification device, the device includes: demulsification tank, dosing port and liquid inlet are provided on its upper end, and outlet is provided at lower end;And the sidewall of the demulsification tank is additionally provided with oil outlet;Dissolved air system, including dissolved air tank and dissolved air pump, the inlet of the dissolved air pump is communicated with the outlet, and the inlet of the dissolved air tank is communicated with the outlet pipeline of dissolved air pump;And the dissolved air tank is additionally provided with air inlet pipe, for leading in compressed air to form dissolved air water;Wherein, the outlet of the dissolved air tank is connected with demulsification tank by dissolved air release device, to make dissolved air water release micro-bubble in demulsification tank, and oil drop in liquid phase floats with micro-bubble and separates from water phase.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to a dissolved gas demulsifier. Background Technology

[0002] Demulsification refers to the process of separating the dispersed phase from the continuous phase in an emulsion (such as a water-in-oil or oil-in-water system). Its core principle is to disrupt the stabilizing effect of the emulsifier, causing the dispersed phase droplets to aggregate and eventually separate.

[0003] Traditional demulsification methods include physical methods (heating, centrifugation, electrostatic demulsification, filtration / membrane separation), chemical methods (adding demulsifiers, salting out), and biological methods (microbial degradation). The most commonly used method is adding demulsifiers followed by stirring and settling. Specifically, a demulsifier is added to the emulsion, which is then thoroughly stirred and allowed to stand for 4–6 hours. The oil phase aggregates and floats to the surface, separating from the aqueous phase. This demulsification process is time-consuming and inefficient, leaving a large amount of fine floating oil and other impurities in the aqueous phase. These impurities typically require further treatment by air flotation to meet process requirements, resulting in complex equipment and high energy consumption.

[0004] Therefore, how to provide a dissolved gas demulsification device to solve the problem that a large number of fine floating oil impurities remain in the aqueous phase after traditional demulsification is a technical problem that urgently needs to be solved by those skilled in the art.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0006] This disclosure provides at least one dissolved gas demulsifier.

[0007] In a first aspect, embodiments of this disclosure provide a dissolved gas demulsifier, comprising: The demulsifier has a chemical inlet and a liquid inlet at the top, a water outlet at the bottom, and an oil drain outlet on the side wall of the demulsifier. The dissolved air system includes a dissolved air tank and a dissolved air pump, wherein the inlet of the dissolved air pump is connected to the outlet of the water, and the inlet of the dissolved air tank is connected to the outlet pipe of the dissolved air pump; and the dissolved air tank is also provided with an air inlet pipe for introducing compressed air to form dissolved air water. The outlet of the dissolved gas tank is connected to the demulsifying tank through a dissolved gas release device, so that the dissolved gas water releases microbubbles in the demulsifying tank, and the oil droplets in the liquid phase float up with the microbubbles and separate from the water phase.

[0008] In one alternative embodiment, the dissolved gas release device is mounted on the bottom of the demulsifying tank via a bracket.

[0009] In one alternative embodiment, the dissolved gas release device includes at least one TS releaser with its outlet facing the bottom of the demulsifying tank.

[0010] In one alternative embodiment, the dissolved gas tank is further equipped with a safety valve and a pressure gauge.

[0011] In one optional embodiment, the inlet of the dissolved gas tank is connected to the outlet of the dissolved gas pump via a delivery pipeline, and a first valve is provided on the delivery pipeline.

[0012] In one optional embodiment, the demulsifying tank is further provided with a reflux port, which is connected to the outlet pipe of the dissolved gas pump through a reflux pipe, and a second valve is provided on the reflux pipe.

[0013] In one optional embodiment, the inlet and outlet of the dissolved air pump are connected by a transparent pipe, and a slag discharge pipe is provided on the transparent pipe; and a third valve is provided between the slag discharge pipe and the inlet of the dissolved air pump.

[0014] In one optional embodiment, there are multiple oil drain ports arranged in a vertical array on the side wall of the demulsifying tank, and an observation window is provided next to each oil drain port.

[0015] In one alternative embodiment, a drain pipe is connected to the outlet pipe of the dissolved air pump, and a fourth valve is provided on the drain pipe.

[0016] In one alternative embodiment, a pH meter is also provided on the top of the demulsifying tank, with its probe extending into the demulsifying tank.

[0017] The beneficial effect of this utility model is that the dissolved gas demulsification device uses a dissolved gas system to assist in demulsification. The dissolved gas water formed in the dissolved gas system is released into microbubbles in the demulsification tank through the action of the dissolved gas release device. The microbubbles collide and adhere with the oil droplets remaining in the aqueous phase to form a "bubble-particle" composite. The composite has a density less than that of water and quickly floats to the surface of the water to form a floating oil layer, thereby separating a large number of fine floating oil impurities remaining in the aqueous phase from the aqueous phase.

[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and drawings.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A perspective view of a dissolved gas demulsifier provided in an embodiment of this disclosure; Figure 2 An internal structural diagram of a dissolved gas demulsifier provided in an embodiment of this disclosure; Figure 3 This is a top view of a dissolved gas demulsifier and dissolved gas release device provided in an embodiment of this disclosure.

[0022] In the picture: 100. Demulsifier; 110. Dosing port; 120. Liquid inlet; 130. Oil outlet; 140. Return outlet; 150. pH meter; 160. Water outlet; 170. Observation window; 200. Dissolved gas system; 210. Dissolved gas tank; 211. Air inlet pipe; 212. Safety valve; 213. Pressure gauge; 220. Dissolved gas pump; 221. Outlet pipe; 300. Dissolved gas release device; 310. Support; 320. TS release device; 400. Delivery pipe; 410. First valve; 500. Return pipe; 510. Second valve; 600. Transparent pipe; 610. Slag discharge pipe; 620. Third valve; 700. Drain pipe; 710. Fourth valve. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0025] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0026] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0027] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0028] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0029] Research has revealed the following drawbacks of existing technologies: Traditional demulsification methods include physical methods (heating, centrifugation, electrostatic demulsification, filtration / membrane separation), chemical methods (adding demulsifiers, salting out), and biological methods (microbial degradation). The most commonly used method is adding demulsifiers combined with stirring and settling. Specifically, a demulsifier is added to the emulsion, which is then thoroughly stirred and allowed to stand for 4–6 hours, causing the oil phase to aggregate and float to the surface, separating from the aqueous phase. This demulsification process is time-consuming and inefficient, leaving a large amount of fine floating oil and other impurities in the aqueous phase. These impurities typically require further air flotation treatment to meet process requirements, resulting in complex equipment and high energy consumption.

[0030] Based on the above research, this disclosure provides a dissolved gas demulsification device that connects the dissolved gas system to the demulsification tank and achieves demulsification through a three-stage synergistic mechanism: primary chemical demulsification (demulsifier), secondary dissolved gas microbubble capture (TS releaser), and tertiary dynamic separation (oil-water interface control). This device separates a large number of fine floating oil impurities remaining in the aqueous phase, thus solving the above-mentioned problems.

[0031] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0034] See Figure 1 This disclosure provides a dissolved air demulsifier, comprising: a demulsifier tank 100, with a dosing port 110 and a liquid inlet 120 at its upper end. The emulsion is fed into the demulsifier tank 100 through the liquid inlet 120, and the dosing port 110 is used to add a demulsifier to the demulsifier tank 100. The lower end of the demulsifier tank 100 is provided with a water outlet 160, and the side wall of the demulsifier tank 100 is also provided with an oil outlet 130. After the emulsion is separated into oil and water, the oil phase is located in the upper layer of the demulsifier tank 100 and is suitable for discharge from the oil outlet 130; the water phase is located in the lower layer of the demulsifier tank 100 and is suitable for discharge from the water outlet 160.

[0035] See Figure 1 and Figure 2The demulsifier 100 is connected to a dissolved air system 200, which includes a dissolved air tank 210 and a dissolved air pump 220. The inlet of the dissolved air pump 220 is connected to the outlet 160, and the inlet of the dissolved air tank 210 is connected to the outlet pipe 221 of the dissolved air pump 220. The dissolved air tank 210 is also equipped with an air inlet pipe 211 for introducing compressed air into the dissolved air tank 210 and forming dissolved air water inside the dissolved air tank 210. The outlet of the dissolved air tank 210 is connected to the demulsifier 100 through a dissolved air release device 300, so that the dissolved air water releases 20-100μm microbubbles inside the demulsifier 100. The microbubbles collide with and adhere to the oil droplets in the emulsion, forming a "bubble-particle" composite. The composite has a density less than water and quickly floats to the water surface to form a floating oil layer, thereby separating a large number of fine floating oil impurities remaining in the aqueous phase from the aqueous phase.

[0036] See Figure 2 In some embodiments, the dissolved gas release device 300 is mounted on the bottom of the demulsifier 100 via a bracket 310 to increase the stability of the dissolved gas release device 300.

[0037] See Figure 2 and Figure 3 In some embodiments, the dissolved gas release device 300 includes at least one TS releaser 320. The TS releaser is provided with a ceramic filter element with a pore size of 50 μm and the outlet of the TS releaser 320 faces the bottom of the demulsifying tank 100, so that microbubbles preferentially contact the micro oil droplets deposited at the bottom of the demulsifying tank 100, adsorb them and then float upward from the bottom of the tank, avoiding dead zones of oil droplet deposition.

[0038] See also Figure 2 In some embodiments, a spring-loaded safety valve 212 is installed on the top of the dissolved gas tank 210, with a pressure relief value set at 0.65 MPa; a shock-resistant pressure gauge 213 is installed on the side wall, with a range of 0-1.0 MPa. During operation, the pressure is maintained at 0.5 ± 0.02 MPa to ensure that the TS releaser 320 generates microbubbles of 20-100 μm.

[0039] See also Figure 2 In some embodiments, the demulsifying tank 100 is also provided with a reflux port 140, which is connected to the outlet pipe 221 of the dissolved air pump 220 via a reflux pipe 500. A second valve 510 is provided on the reflux pipe 500. After both the emulsion and the demulsifier are added to the demulsifying tank 100, the dissolved air pump 220 and the second valve 510 are opened. The emulsion drawn out by the dissolved air pump 220 is suitable to enter the demulsifying tank 100 through the reflux pipe 500, achieving reflux stirring. With the above configuration, there is no need to install a mechanical stirring device, reducing the enterprise's investment costs.

[0040] See also Figure 2In some embodiments, the inlet of the dissolved gas tank 210 is connected to the outlet of the dissolved gas pump 220 via a delivery pipe 400, on which a first valve 410 is installed. After the emulsion is stirred evenly, the second valve 510 is closed and the first valve 410 is opened, and the emulsion is pumped into the dissolved gas tank 210. Dissolved gas water is formed by compressed air, and the dissolved gas water then enters the demulsification tank 100 through the dissolved gas release device, where microbubbles are formed that adhere to the oil droplets in the emulsion.

[0041] See also Figure 2 In some embodiments, the inlet and outlet 160 of the dissolved air pump 220 are connected by a transparent pipe 600, on which a slag discharge pipe 610 is provided; and a third valve 620 is provided between the slag discharge pipe 610 and the inlet of the dissolved air pump 220. Whether there is sediment in the emulsion entering the transparent pipe 600 from the outlet 160 can be observed through the transparent pipe 600. When there is a large amount of sediment, the third valve 620 is closed and the slag discharge pipe 610 is opened. The sediment can then be discharged through the slag discharge pipe 610.

[0042] See also Figure 2 In some embodiments, there are multiple oil drain ports 130 arranged in a vertical array on the side wall of the demulsifying tank 100, and an observation window 170 is provided next to each oil drain port 130. The observation window 170 is used to monitor the oil layer thickness in real time to select the corresponding oil drain port 130 and accurately drain all the upper floating oil.

[0043] See also Figure 2 In some embodiments, a drain pipe 700 is connected to the outlet pipe 221 of the dissolved air pump 220, and a fourth valve 710 is installed on the drain pipe 700. After the upper layer of floating oil is drained, the dissolved air pump 220 and the fourth valve 710 are opened, and the first valve 410 and the second valve 510 are closed, so that the remaining aqueous phase of the demulsifier 100 can be discharged.

[0044] See also Figure 2 In some embodiments, a pH meter 150 is also provided on the top of the demulsifier 100, with its detection head extending into the demulsifier 100. The pH meter 150 is suitable for detecting the pH value of the demulsifier and controlling the addition of sulfuric acid based on the pH value to maintain an acidic environment (pH 2-3) for the emulsion. The acidic environment increases the contact angle of the oil droplet surface, which can significantly improve the adhesion efficiency of dissolved gas microbubbles.

[0045] In summary, this dissolved gas demulsifier uses a dissolved gas system 200 to assist in demulsification. The dissolved gas water formed in the dissolved gas system 200 is released into microbubbles in the demulsification tank 100 by the dissolved gas release device 300. The microbubbles collide with and adhere to the oil droplets remaining in the aqueous phase, forming a "bubble-particle" composite. The composite has a density less than water and quickly floats to the water surface to form a floating oil layer, thereby separating a large number of fine floating oil impurities remaining in the aqueous phase from the aqueous phase.

[0046] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0048] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0049] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0050] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A dissolved gas demulsifier, characterized in that, include: The demulsifier (100) has a chemical inlet (110) and a liquid inlet (120) at its upper end and a water outlet (160) at its lower end. The side wall of the demulsifier (100) is also provided with an oil drain outlet (130). The dissolved air system (200) includes a dissolved air tank (210) and a dissolved air pump (220). The inlet of the dissolved air pump (220) is connected to the outlet (160), and the inlet of the dissolved air tank (210) is connected to the outlet pipe (221) of the dissolved air pump (220). The dissolved air tank (210) is also provided with an air inlet pipe (211) for introducing compressed air to form dissolved air water. The outlet of the dissolved gas tank (210) is connected to the demulsifier (100) through the dissolved gas release device (300) so that the dissolved gas water releases microbubbles in the demulsifier (100), and the oil droplets in the liquid phase float up with the microbubbles and separate from the water phase.

2. The dissolved gas demulsifier as described in claim 1, characterized in that, The dissolved gas release device (300) is mounted on the bottom of the demulsifier (100) via a bracket (310).

3. The dissolved gas demulsifier as described in claim 1, characterized in that, The dissolved gas release device (300) includes at least one TS releaser (320) with its outlet facing the bottom of the demulsifier (100).

4. The dissolved gas demulsifier as described in claim 1, characterized in that, The dissolved gas tank (210) is also equipped with a safety valve (212) and a pressure gauge (213).

5. The dissolved gas demulsifier as described in claim 1, characterized in that, The inlet of the dissolved gas tank (210) is connected to the outlet of the dissolved gas pump (220) through a conveying pipe (400), and a first valve (410) is provided on the conveying pipe (400).

6. The dissolved gas demulsifier as described in claim 1, characterized in that, The demulsifier (100) is also provided with a reflux port (140), which is connected to the outlet pipe (221) of the dissolved air pump (220) through a reflux pipe (500), and a second valve (510) is provided on the reflux pipe (500).

7. The dissolved gas demulsifier as described in claim 1, characterized in that, The inlet and outlet (160) of the dissolved air pump (220) are connected by a transparent pipe (600), and a slag discharge pipe (610) is provided on the transparent pipe (600); and a third valve (620) is provided between the slag discharge pipe (610) and the inlet of the dissolved air pump (220).

8. The dissolved gas demulsifier as described in claim 1, characterized in that, There are multiple oil drain ports (130), which are arranged in a vertical array on the side wall of the demulsifier (100), and an observation window (170) is provided next to the oil drain ports (130).

9. The dissolved gas demulsifier as described in claim 1, characterized in that, The outlet pipe (221) of the dissolved air pump (220) is connected to a drain pipe (700), and a fourth valve (710) is provided on the drain pipe (700).

10. The dissolved gas demulsifier as described in claim 1, characterized in that, The top of the demulsifier (100) is also equipped with a pH meter (150), the probe of which extends into the demulsifier (100).

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