Oily sewage dealkylation treatment device and method

Abstract

The invention discloses an oil-containing sewage dealkylation treatment device and a method thereof, and belongs to the technical field of sewage treatment. The oil-containing sewage dealkylation treatment device comprises a sewage collecting tank and a dealkylation tower, a first partition plate is arranged in an inner cavity of the sewage collecting tank, the first partition plate is connected to the bottom surface of the inner cavity of the sewage collecting tank, an overflow space is formed between the first partition plate and the top surface of the inner cavity of the sewage collecting tank, and the inner cavity of the sewage collecting tank is divided by the first partition plate into an oily water chamber and a deoiling chamber; the oily water chamber is communicated with the deoiling chamber through the overflow space; the deoiling chamber is used for communicating with an organic matter recovery system; a feeding pipeline is connected between the dealkylation tower and the bottom of the oily water chamber, and a feeding pump is arranged on the feeding pipeline; a material return pipeline is connected between the dealkylation tower and the top of the oily water chamber, and a first condenser is arranged on the material return pipeline; the bottom of the dealkylation tower is connected with a drainage pipeline which is communicated with a sewage treatment system. According to the invention, high-efficiency condensation recovery and recycling of removed organic matters are realized.

Description

Oily wastewater dehydrocarbon removal treatment device and method Technical Field

[0001] This application belongs to the field of wastewater treatment technology, and in particular relates to an oily wastewater dehydrocarbonation treatment device and method. Background Technology

[0002] During the production processes of petrochemical and oil refining plants, a large amount of oily wastewater is generated. This wastewater typically contains various dissolved or emulsified organic hydrocarbons. Direct discharge of such wastewater not only causes environmental pollution but may also severely impact the stable operation of subsequent wastewater treatment systems.

[0003] Currently, gravity sedimentation is the most common method used in the industry for dehydrocarbon removal from oily wastewater in process units. This method mainly relies on the density difference between oil and water to achieve preliminary separation of the oil phase, and has the advantages of simple operation and low cost. However, gravity sedimentation has obvious limitations: on the one hand, its separation efficiency is greatly affected by factors such as wastewater properties, residence time, and temperature, resulting in significant fluctuations and poor stability of organic hydrocarbon content in the effluent; on the other hand, different types of organic hydrocarbons (especially light hydrocarbons and aromatics) have large differences in solubility in water, and a considerable portion of dissolved or microemulsified hydrocarbons cannot be effectively removed by simple gravity sedimentation. Therefore, the organic hydrocarbon index of wastewater treated by traditional methods often exceeds the acceptance limits of downstream wastewater treatment plants.

[0004] If such wastewater exceeding the standards is directly discharged into the wastewater treatment plant, the high concentration of hydrocarbons will inhibit the activity of microorganisms in the biological system, impact the treatment process, seriously affect the treatment effect, and even lead to the final discharge water quality failing to meet the standards, bringing environmental risks and operational hazards. Summary of the Invention

[0005] This application aims to at least address the technical problem in the prior art where the organic hydrocarbon index of treated wastewater often exceeds the acceptance limit of downstream wastewater treatment plants.

[0006] In a first aspect, this application provides an oily wastewater dehydrocarbonization treatment device, comprising: a wastewater collection tank and a dehydrocarbonization tower; the inner cavity of the wastewater collection tank is provided with a first partition, the first partition is connected to the bottom surface of the inner cavity of the wastewater collection tank and forms an overflow space between the first partition and the top surface of the inner cavity of the wastewater collection tank, the first partition divides the inner cavity of the wastewater collection tank into an oily wastewater chamber and an oil removal chamber; the oily wastewater chamber is connected to the oil removal chamber through the overflow space; the oil removal chamber is used to connect with an organic matter recovery system; a feed pipe is connected between the dehydrocarbonization tower and the bottom of the oily wastewater chamber, and a feed pump is provided on the feed pipe; a return pipe is connected between the dehydrocarbonization tower and the top of the oily wastewater chamber, and a first condenser is provided on the return pipe; a drain pipe is connected to the bottom of the dehydrocarbonization tower, and a second condenser is provided on the drain pipe, and the drain pipe is used to connect with a wastewater treatment system.

[0007] According to one embodiment of this application, the inner cavity of the sewage collection tank is further provided with a second partition, the second partition is connected to the top surface of the inner cavity of the sewage collection tank, and forms a flow space between the second partition and the bottom surface of the inner cavity of the sewage collection tank, the flow space being located in the oily sewage chamber.

[0008] According to one embodiment of this application, the sewage collection tank is further connected to an oily sewage pipeline, the oily sewage pipeline is equipped with a filter, and the oily sewage pipeline is connected to the oily sewage chamber.

[0009] According to one embodiment of this application, the sewage collection tank is further connected to a pressure discharge valve and a nitrogen replenishment valve; the pressure discharge valve and the nitrogen replenishment valve are adapted to communicate with the inner cavity of the sewage collection tank.

[0010] According to one embodiment of this application, the inner cavity of the sewage collection tank is provided with a boundary controller, the feed pipeline is provided with a first control valve, and the boundary controller is connected to the first control valve; wherein the boundary controller is used to detect the boundary in the oily sewage chamber, and when the boundary is lower than a preset boundary, the opening degree of the first control valve is controlled to decrease; when the boundary is higher than the preset boundary, the opening degree of the first control valve is controlled to increase.

[0011] According to one embodiment of this application, both the feed pipeline and the return pipeline are located at the top of the dehydrogenation tower; a steam pipeline is connected to the bottom of the dehydrogenation tower.

[0012] According to one embodiment of this application, the dehydrogenation tower is further provided with a plurality of trays, which are spaced apart along the height direction of the dehydrogenation tower, and each tray is provided with tray holes.

[0013] According to one embodiment of this application, the steam pipeline is provided with a second flow meter and a second control valve, the second control valve being downstream of the second flow meter.

[0014] According to one embodiment of this application, the bottom of the deoiling chamber is connected to a recovery pipeline, and a delivery pump is provided on the recovery pipeline. The recovery pipeline is used to connect to an organic matter recovery system.

[0015] According to one embodiment of this application, the end of the oily wastewater pipeline away from the wastewater collection tank is used to connect to an oily wastewater generating device, which includes a wet solvent dehydration tank, a solvent dehydration tower reflux tank, a butadiene recovery tower reflux tank, a crude solvent water washing decanter, a water washing circulation pump, and a wet butadiene separation tank.

[0016] Secondly, this application provides a method for dehydrocarbonization treatment of oily wastewater, comprising: separating the oil phase in the oily wastewater chamber into the deoiling chamber through a first partition; pumping the aqueous phase in the oily wastewater chamber into a dehydrocarbonization tower; introducing steam into the dehydrocarbonization tower to separate the aqueous phase into a gas phase; introducing the aqueous phase separated into a gas phase into a wastewater treatment system; condensing the gas phase through a first condenser to form a liquid oil phase; and introducing the liquid oil phase into the oily wastewater chamber.

[0017] According to one embodiment of this application, the temperature of the low-pressure steam is 180°C to 250°C; and / or, the pressure of the low-pressure steam is 0.18 to 0.3 MPa.

[0018] According to one embodiment of this application, the temperature inside the dehydrogenation tower is 100–140°C; and / or, the pressure inside the dehydrogenation tower and the wastewater collection tank is 0.5–0.1 MPa.

[0019] In summary, this application includes at least one of the following beneficial technical effects: The oily wastewater dehydrocarbonization treatment device of this application, through the overflow baffle design in the wastewater collection tank, firstly achieves the pre-separation and collection of the oil phase; subsequently, the aqueous phase is deeply heated using a dehydrocarbonization tower, efficiently vaporizing and removing dissolved and emulsified light hydrocarbons that are difficult to handle by traditional gravity sedimentation methods under low pressure; finally, the hydrocarbons are recovered through the first condenser and flowed back into the wastewater collection tank, and the treated effluent from the second condenser is transported to the wastewater treatment system. This not only achieves efficient condensation recovery and resource utilization of the removed organic matter, but also ensures the stability of the temperature and water quality of the treated effluent, ultimately achieving the dual goals of stable deep removal of hydrocarbons and safe and compliant wastewater treatment.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a structural schematic diagram of an oily wastewater dehydrocarbonization treatment device provided in an embodiment of this application; Figure 2 is a structural schematic diagram of a wastewater collection tank provided in an embodiment of this application.

[0022] Reference numerals: 10. Wastewater collection tank; 11. First baffle; 12. Oily wastewater chamber; 13. De-oiling chamber; 14. Second baffle; 151. Pressure discharge valve; 152. Nitrogen replenishment valve; 16. Interface controller; 17. First flow meter; 20. Dehydrocarbonization tower; 21. Tower tray; 31. Feed pipeline; 311. Feed pump; 32. Return pipeline; 321. First condenser; 33. Drainage pipeline; 331. Second condenser; 34. Oily wastewater pipeline; 341. Filter; 35. Steam pipeline; 36. Recovery pipeline. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0024] Oily wastewater is a common occurrence in the production and operation of petrochemical and oil refining plants. This type of wastewater typically contains a variety of complex components, including dissolved organic hydrocarbons, emulsified hydrocarbons, and fine oil droplets. If discharged directly without adequate treatment, it will not only cause persistent pollution to the aquatic environment but may also pose a serious threat to the stable operation of subsequent wastewater treatment units.

[0025] In current industrial practice, gravity sedimentation is the mainstream treatment method, mainly relying on the density difference between oil and water to achieve preliminary separation of the oil phase. Its operation process is simple and the equipment investment cost is low. However, this method has significant technical bottlenecks: the separation process is highly sensitive to the physicochemical properties of wastewater, such as temperature fluctuations, changes in wastewater viscosity, and insufficient residence time, which can easily lead to uncontrollable fluctuations in the content of organic hydrocarbons in the effluent, making it difficult to guarantee treatment stability. At the same time, for light hydrocarbons (such as low molecular weight alkanes) and aromatics, due to their high solubility in the aqueous phase or the formation of a stable microemulsion, gravity sedimentation cannot effectively disrupt their dispersion system, resulting in a large amount of dissolved hydrocarbons remaining in the aqueous phase.

[0026] The resulting treated wastewater frequently exceeds the receiving threshold of downstream wastewater treatment plants due to its high concentration of organic hydrocarbons. When such wastewater with excessive levels of hydrocarbons enters the biochemical treatment process, the high concentration of hydrocarbons will severely inhibit the metabolic activity of microorganisms, interfere with the normal progress of the biodegradation process, and lead to risks such as reduced treatment efficiency, abnormal system operation, and even substandard effluent quality, posing a continuous threat to environmental protection and facility safety.

[0027] The apparatus and method for dehydrocarbonization treatment of oily wastewater according to embodiments of this application are described below with reference to Figures 1 and 2.

[0028] As shown in Figures 1 and 2, the oily wastewater dehydrocarbonization treatment device includes: a wastewater collection tank 10 and a dehydrocarbonization tower 20; the wastewater collection tank 10 is used to receive oily wastewater. The inner cavity of the wastewater collection tank 10 is provided with at least one first baffle 11, which is connected to the bottom surface of the inner cavity of the wastewater collection tank 10 and forms an overflow space between the first baffle 11 and the top surface of the inner cavity of the wastewater collection tank 10.

[0029] The first partition 11 separates the inner cavity of the sewage collection tank 10 to form an oily sewage chamber 12 and an oil removal chamber 13; the oily sewage chamber 12 is connected to the oil removal chamber 13 through an overflow space.

[0030] The deoiling chamber 13 is connected to an organic matter recovery system, which is used to further process and recycle the oil phase overflowing from the deoiling chamber 13 to achieve resource recovery.

[0031] A feed pipe 31 connects the bottom of the dehydrocarbon removal tower 20 and the oily wastewater chamber 12, and a feed pump 311 is installed on the feed pipe 31 to provide power to the aqueous phase in the feed pipe 31, ensuring that the aqueous phase can be stably and continuously transported to the dehydrocarbon removal tower 20. The dehydrocarbon removal tower 20 is used to perform deep separation of dissolved or emulsified hydrocarbons in wastewater. Hydrocarbons and oil can be separated from the aqueous phase through physical processes such as heating and vaporization.

[0032] A return pipeline 32 is connected between the top of the dehydrocarbon removal tower 20 and the top of the oily wastewater chamber 12. A first condenser 321 is provided on the return pipeline 32. The first condenser 321 is used to condense the gas phase (mainly hydrocarbon vapor) in the return pipeline 32 and send it back to the oily wastewater chamber 12 of the wastewater collection tank 10 through the return pipeline 32.

[0033] The bottom of the dehydrogenation tower 20 is connected to a drainage pipe 33, and a second condenser 331 is installed on the drainage pipe 33. The water phase in the dehydrogenation tower 20 flows out through the drainage pipe 33 and is cooled by the second condenser 331 before entering the sewage treatment system.

[0034] This wastewater treatment system is used to perform final purification treatment on the aqueous phase after it has been treated by the dehydrocarbonation tower 20, so that it meets the discharge standards.

[0035] Specifically, the first partition 11 is connected to the bottom surface of the inner cavity of the wastewater collection tank 10, forming an overflow space between it and the top surface of the inner cavity of the wastewater collection tank 10. The first partition 11 divides the inner cavity of the wastewater collection tank 10 into an oily wastewater chamber 12 and an oil removal chamber 13. The oily wastewater chamber 12 is used to receive the original oily wastewater, while the oil removal chamber 13 is used to collect the separated oil phase. The oily wastewater chamber 12 is connected to the oil removal chamber 13 through the overflow space, allowing the oil phase separated in the oily wastewater chamber 12 to overflow into the oil removal chamber 13. The oil removal chamber 13 is further connected to an organic matter recovery system to transport the recovered oil phase to this system for subsequent processing.

[0036] Furthermore, a feed pump 311 is installed on the feed pipeline 31 to provide power for the aqueous phase in the feed pipeline 31, ensuring that the aqueous phase can be stably and continuously transported to the dehydrogenation tower 20. A return pipeline 32 is connected between the top of the dehydrogenation tower 20 and the oily wastewater chamber 12, and a first condenser 321 is installed on the return pipeline 32. The function of the return pipeline 32 is to transport the gas phase separated in the dehydrogenation tower 20 back to the wastewater collection tank 10, and the first condenser 321 is used to condense these gas phases into liquid phases and return the condensed liquid phases to the oily wastewater chamber 12. In addition, a drain pipeline 33 is connected to the bottom of the dehydrogenation tower 20, and a second condenser 331 is installed on the drain pipeline 33. The drain pipeline 33 is used to transport the aqueous phase processed by the dehydrogenation tower 20 to the wastewater treatment system.

[0037] The oily wastewater dehydrocarbon removal device of this application first achieves the pre-separation and collection of the oil phase through the overflow baffle design in the wastewater collection tank 10; then, the aqueous phase is deeply heated by the dehydrocarbon removal tower 20, and the dissolved and emulsified light hydrocarbons that are difficult to handle by traditional gravity sedimentation are efficiently vaporized under low pressure; finally, the hydrocarbons are recovered by the first condenser 321 and flowed back into the wastewater collection tank 10, and the treated water by the second condenser 331 is transported to the wastewater treatment system. This not only achieves efficient condensation recovery and resource utilization of the removed organic matter, but also ensures the stability of the temperature and water quality of the treated water, ultimately achieving the dual goals of stable deep removal of hydrocarbons and safe and compliant wastewater treatment.

[0038] In some embodiments, the inner cavity of the sewage collection tank 10 is further provided with at least one second baffle 14, the second baffle 14 is connected to the top surface of the inner cavity of the sewage collection tank 10, and forms a flow space between the second baffle 14 and the bottom surface of the inner cavity of the sewage collection tank 10, the flow space being located in the oily sewage chamber 12.

[0039] In this embodiment, the oil in the oily wastewater will remain on the side of the second partition 14 away from the first partition 11, thereby facilitating oil-water separation.

[0040] In actual implementation, the angle between the second partition 14 and the top surface of the inner cavity of the sewage collection tank 10 is 90° or 75°; and / or, the angle between the first partition 11 and the bottom surface of the inner cavity of the sewage collection tank 10 is 90° or 75°.

[0041] It should be noted that during the dehydrocarbonization process of oily wastewater, the untreated oily wastewater may contain solid particles or suspended impurities. If these impurities directly enter the wastewater collection tank 10, they may affect the oil-water separation effect and may even block the tray holes of the downstream dehydrocarbonization tower 20.

[0042] In some embodiments, the wastewater collection tank 10 is also connected to an oily wastewater pipeline 34, which is equipped with a filter 341 and is connected to the oily wastewater chamber 12. The filter 341 is used to intercept and remove suspended impurities such as solid particles, fibers, and silt that may be present in the oily wastewater, ensuring that the oily wastewater entering the wastewater collection tank 10 has a high degree of cleanliness.

[0043] In some embodiments, the wastewater collection tank 10 is also connected to a pressure discharge valve 151 and a nitrogen replenishment valve 152; the pressure discharge valve 151 and the nitrogen replenishment valve 152 are adapted to communicate with the inner cavity of the wastewater collection tank 10.

[0044] In this embodiment, the wastewater collection tank 10 is connected to the dehydrocarbonization tower 20 via the feed pipeline 31, and the pressure discharge valve 151 and the nitrogen replenishment valve 152 are both connected to the inner cavity of the wastewater collection tank 10. By coordinating the operation of the pressure discharge valve 151 and the nitrogen replenishment valve 152, the low-pressure environment inside the wastewater collection tank 10 can be precisely adjusted and maintained.

[0045] Its core objective is to lower the boiling point of oily wastewater, enabling the aqueous phase (dissolved and emulsified light hydrocarbons and oil) within the dehydrocarbon removal tower 20 to be efficiently vaporized and separated at relatively low heating temperatures. This design directly reduces the energy consumption demand on external heat sources, achieving energy conservation; furthermore, maintaining pressure stability and isolating oxygen through nitrogen supplementation also enhances the operational safety of the entire pretreatment process.

[0046] In some embodiments, the inner cavity of the sewage collection tank 10 is provided with a boundary controller 16, and the feed pipeline 31 is provided with a first control valve. The boundary controller 16 is electrically connected to the first control valve. The boundary controller 16 is used to detect the boundary in the oily sewage chamber 12. When the boundary is lower than the preset boundary, the opening of the first control valve is reduced. When the boundary is higher than the preset boundary, the opening of the first control valve is increased.

[0047] In this embodiment, the interface position of the oil-water chamber 12 is precisely maintained within a set range by the interface controller 16 and the first control valve. The interface position is the position between two incompatible media. A stable interface position is a prerequisite for a stable oil-water interface and a controllable separation process, ensuring that the oil phase separated from the upper layer can continuously and constantly enter the deoiling chamber 13 through the overflow space.

[0048] In some embodiments, the feed line 31 is further provided with a first flow meter 17, which is located upstream of the first control valve. The distance between the interface and the preset interface can be determined by the first flow meter 17.

[0049] In some embodiments, the feed line 31 and the return line 32 are both located at the top of the dehydrogenation tower 20; the bottom of the dehydrogenation tower 20 is connected to the steam line 35.

[0050] In this embodiment, the aqueous phase enters from the top of the column and comes into full countercurrent contact with the steam rising from the bottom. The steam removes hydrocarbons from the aqueous phase, which are then discharged from the top of the column, while the dehydrocarbonized aqueous phase is discharged from the bottom. This significantly improves the mass transfer efficiency between the aqueous phase and the steam, enhances the dehydrocarbonization effect, and optimizes energy consumption, making the entire dehydrocarbonization process more economical and efficient.

[0051] In actual operation, the dehydrogenation tower 20 is also equipped with multiple trays 21, which are spaced apart along the height of the dehydrogenation tower 20. Each tray 21 has tray holes. The number of trays 21 can be 15.

[0052] In some embodiments, a second flow meter and a second control valve are provided on the steam line 35, with the second control valve downstream of the second flow meter.

[0053] In actual operation, the temperature of the low-pressure steam is 180℃~250℃; and / or, the pressure of the low-pressure steam is 0.18~0.3 MPa. In actual operation, the temperature inside the dehydrogenation tower 20 is 100~140℃; and / or, the pressure inside the dehydrogenation tower 20 and the wastewater collection tank 10 is 0.5~-0.1 MPa.

[0054] In actual operation, the bottom of the deoiling chamber 13 is connected to a recovery pipeline 36, which is equipped with a transfer pump and is used to connect to the organic matter recovery system.

[0055] This application also proposes a method for dehydrocarbonization treatment of oily wastewater, comprising: S1, separating the oil phase in the oily wastewater chamber 12 into the deoiling chamber 13 through the first partition 11; S2, pumping the aqueous phase in the oily wastewater chamber 12 into the dehydrocarbonization tower 20; S3, introducing steam into the dehydrocarbonization tower 20 to separate the aqueous phase into a gas phase; S4, introducing the separated gas phase into the wastewater treatment system; S5, condensing the gas phase through the first condenser 321 to form liquid oil; S6, introducing the liquid oil into the oily wastewater chamber 12.

[0056] In actual operation, the temperature of the low-pressure steam is 180℃~250℃; and / or, the pressure of the low-pressure steam is 0.18~0.3 MPa. In actual operation, the temperature inside the dehydrogenation tower 20 is 100~140℃; and / or, the pressure inside the dehydrogenation tower 20 and the wastewater collection tank 10 is 0.5~-0.1 MPa. In actual operation, the gas phase (mainly hydrocarbon vapor) is condensed to obtain liquid oil; the temperature of this liquid oil does not exceed 40℃.

[0057] Specifically, Table 1 lists the feed conditions of each component in the oily wastewater into the wastewater collection tank at 100% load in this embodiment, Table 2 lists the feed process parameters of the wastewater collection tank at 100% load, and Table 3 lists the relevant process parameters of the dehydrogenation tower at 100% load. In the dehydrogenation tower, the overall pressure drop of the tower during the entire stripping process is no greater than 10 kPa.

[0058] Table 1. Feeding status of various components in oily wastewater into the wastewater collection tank at 100% load (normal). Table 2. Feeding information for the wastewater collection tank at 100% load. Table 3 Relevant process parameters of the dehydrogenation tower at 100% load The total reflux of the aqueous phase in the wastewater collection tank 10 refers to the separation of the oil and water condensed from the top of the dehydrogenation tower 20 and the collected oily wastewater into layers in the wastewater collection tank 10. The oil is removed, and the aqueous phase is pumped back to the top of the dehydrogenation tower 20.

[0059] Table 4. Relevant process parameters for stripping treatment in the dehydrogenation tower in the examples. Among them, the design temperature refers to the highest stripping temperature (or highest operating temperature) allowed by the dehydrogenation tower 20 under various operating conditions; the operating flexibility range refers to the ratio of the maximum sewage treatment capacity, the minimum sewage treatment capacity, and the normal sewage treatment capacity.

[0060] As shown in Tables 3 and 4, the extraction process of organic matter in the dehydrogenation tower 20 is as follows: Low-pressure steam is introduced from the bottom of the dehydrogenation tower 20 and flows upwards step by step from the bottom tray 21, where it comes into countercurrent contact with the water phase (wastewater) flowing downwards, thus performing stripping treatment. The stripping temperature at the bottom of the dehydrogenation tower 20 is higher than that at the top. This temperature gradient is beneficial for the step-by-step and selective stripping of organic matter with different boiling points, thereby achieving the graded separation and recovery of organic matter. Due to the lower temperature at the top of the tower and the fact that the gas phase carries organic matter (or oil) during the stripping process, the density of the gas phase at the top of the tower is lower than that at the bottom of the tower.

[0061] In this embodiment, after the oily wastewater is separated by the wastewater collection tank 10 and stripped by the dehydrogenation tower 20, the hydrocarbon content in the aqueous phase discharged from the bottom of the tower and the separated gas phase can be reduced to no more than 10 mg / L.

[0062] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0063] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 application.

[0064] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0065] In the description of this application, "multiple" means two or more.

[0066] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0067] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A device for dehydrocarbonization treatment of oily wastewater, characterized in that, include: Wastewater collection tanks and dehydrocarbon removal towers; The wastewater collection tank has a first partition in its inner cavity. The first partition is connected to the bottom surface of the inner cavity of the wastewater collection tank and forms an overflow space between it and the top surface of the inner cavity. The first partition separates the inner cavity of the wastewater collection tank into an oily wastewater chamber and an oil removal chamber. The oily wastewater chamber is connected to the oil removal chamber through the overflow space. The oil removal chamber is used to connect with an organic matter recovery system. A feed pipe is connected between the dehydrocarbonization tower and the bottom of the oily wastewater chamber, and a feed pump is installed on the feed pipe. A return pipe is connected between the dehydrocarbonization tower and the top of the oily wastewater chamber, and a first condenser is installed on the return pipe. A drain pipe is connected to the bottom of the dehydrocarbonization tower, and a second condenser is installed on the drain pipe. The drain pipe is used to connect with a wastewater treatment system.

2. The oily wastewater dehydrocarbonization treatment device according to claim 1, characterized in that, The inner cavity of the sewage collection tank is also provided with a second partition. The second partition is connected to the top surface of the inner cavity of the sewage collection tank and forms a flow space between it and the bottom surface of the inner cavity of the sewage collection tank. The flow space is located in the oily sewage chamber.

3. The oily wastewater dehydrocarbonization treatment device according to claim 1, characterized in that, The wastewater collection tank is also connected to an oily wastewater pipeline, which is equipped with a filter and is connected to the oily wastewater chamber.

4. The oily wastewater dehydrocarbonization treatment device according to claim 1, characterized in that, The wastewater collection tank is also connected to a pressure discharge valve and a nitrogen replenishment valve; the pressure discharge valve and the nitrogen replenishment valve are adapted to communicate with the inner cavity of the wastewater collection tank.

5. The oily wastewater dehydrocarbonization treatment device according to claim 1, characterized in that, The wastewater collection tank is equipped with a boundary controller in its inner cavity, and the feed pipeline is equipped with a first control valve. The boundary controller is connected to the first control valve. The boundary controller is used to detect the boundary in the oily wastewater chamber. When the boundary is lower than a preset boundary, the controller controls the opening of the first control valve to decrease. When the boundary is higher than the preset boundary, the controller controls the opening of the first control valve to increase.

6. The oily wastewater dehydrocarbonization treatment device according to claim 5, characterized in that, The feed pipeline is also equipped with a first flow meter, which is located upstream of the first control valve.

7. The oily wastewater dehydrocarbonization treatment device according to claim 1, characterized in that, Both the feed pipeline and the return pipeline are located at the top of the dehydrogenation tower; a steam pipeline is connected to the bottom of the dehydrogenation tower.

8. The oily wastewater dehydrocarbonization treatment device according to claim 7, characterized in that, The dehydrogenation tower is also provided with multiple trays, which are spaced apart along the height of the dehydrogenation tower, and each tray has tray holes.

9. The oily wastewater dehydrocarbonization treatment device according to claim 7, characterized in that, The steam pipeline is equipped with a second flow meter and a second control valve, with the second control valve located downstream of the second flow meter.

10. The oily wastewater dehydrocarbonization treatment device according to claim 1, characterized in that, The bottom of the deoiling chamber is connected to a recovery pipeline, which is equipped with a transfer pump and is used to connect to an organic matter recovery system.

11. A method for dehydrocarbonation treatment of oily wastewater as described in any one of claims 1-10, characterized in that, include: The oil phase in the oily wastewater chamber is separated into the deoiling chamber by the first partition; the aqueous phase in the oily wastewater chamber is pumped into the dehydrocarbonation tower; steam is introduced into the dehydrocarbonation tower to separate the aqueous phase into a gas phase; the aqueous phase separated into a gas phase is introduced into the wastewater treatment system; the gas phase is condensed by the first condenser to form liquid oil; the liquid oil is introduced into the oily wastewater chamber.

12. The dehydrocarbonization treatment method according to claim 11, characterized in that, The temperature of the steam is 180℃~250℃; and / or the pressure of the steam is 0.18~0.3MPa.

13. The dehydrocarbonization treatment method according to claim 11, characterized in that, The temperature inside the dehydrogenation tower is 100–140°C; and / or the pressure inside the dehydrogenation tower and the wastewater collection tank is 0.5–0.1 MPa.

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