A double helix mixer and disc centrifuge integrated oil sludge hot water washing system

Abstract

This invention provides a hot water washing system for oily sludge that integrates a twin-helix mixer and a disc centrifuge. The system includes a feeding unit, a twin-helix mixing unit, and a disc centrifugal separation unit. The feeding unit feeds material into the twin-helix mixing unit. The inlet of the disc centrifugal separation unit is connected to the outlet of the twin-helix mixing unit via a feed pump. The disc centrifugal separation unit centrifuges and separates the oily sludge treated by the twin-helix mixing unit. The twin-helix mixing unit achieves efficient convective mixing of oily sludge with hot water and chemicals. The disc centrifugal separation unit enables rapid separation of the oil-water-sludge three phases. Simultaneously, a temperature control unit can regulate the material temperature within the mixing unit in real time, and a chemical addition unit precisely proportions the cleaning agents. This highly integrated system improves mixing uniformity by 20%-30% and separation efficiency by 15%-25% compared to conventional equipment, making it suitable for the efficient and harmless treatment of various types of industrial oily sludge.

Description

Technical Field

[0001] This invention belongs to the technical field of oil sludge treatment systems, specifically relating to a hot water washing system for oil sludge that integrates a twin-helix mixer and a disc centrifuge. Background Technology

[0002] Oil sludge is an extremely complex mixture, mainly containing petroleum, water, and sludge. Depending on its formation, oil sludge is generally classified into landfill sludge, tank bottom sludge, surface oil spills, and oily refinery sludge. With dwindling petroleum resources, oil sludge resources are becoming increasingly precious. Currently, many countries both domestically and internationally have adopted various treatment technologies to handle oil sludge. Hot water washing is one such method, which can recover crude oil and reduce the oil content in the sludge to meet environmental standards.

[0003] However, existing hot water washing equipment for oil sludge suffers from insufficient mixing, low solid-liquid separation efficiency, and poor system integration.

[0004] Based on this, a hot water washing system for oily sludge, which integrates a double-helix mixer and a disc centrifuge, is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a hot water washing system for oily sludge that integrates a double helical mixer and a disc centrifuge, in order to address the shortcomings of the prior art mentioned above.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a hot water washing system for oily sludge that integrates a double helix mixer and a disc centrifuge, comprising; Feeding unit A double-helix mixing unit, wherein the feeding unit performs material feeding operations into the double-helix mixing unit; The disc centrifugal separation unit has its inlet connected to the outlet of the double-helix mixing unit via a feed pump. The disc centrifugal separation unit performs centrifugal separation of the sludge processed by the double-helix mixing unit.

[0007] As a further explanation of the present invention, the feeding unit consists of a conveyor and a filter screen. The filter screen has a pore size of 3-5 mm. The oil sludge screened by the filter screen is fed into the double helix mixing unit by the conveyor.

[0008] As a further explanation of the present invention, the conveyor is a belt conveyor, a screw feeder, or a belt conveyor.

[0009] As a further explanation of the present invention, the double-helix mixing unit includes a horizontal tank, a helical shaft, and helical blades. There are two helical shafts, which are arranged parallel to each other in the horizontal tank. The rotation speed of the helical shafts is 50-80 r / min. Each helical shaft is provided with helical blades. The pitch of the helical blades is 180-220 mm. The gap between the helical blades and the inner wall of the horizontal tank is 3-5 mm. The helical blades adopt a variable pitch design, with the pitch at the feed end being smaller than that at the discharge end.

[0010] As a further explanation of the present invention, the outer side of the horizontal tank is provided with a jacketed heating cavity.

[0011] As a further explanation of the present invention, the disc centrifugal separation unit is a three-phase disc centrifuge, the drum of the disc centrifugal separation unit is located at the bottom, and the rotation speed of the drum is 5500-7000 r / min, and the separation factor is 4500-6500. The disc centrifugal separation unit is provided with an oil outlet at the top, a drain outlet in the middle, and a slag discharge outlet at the bottom. A heating and insulation sleeve is provided on the outside of the slag discharge outlet, and the temperature of the heating and insulation sleeve is 50-60℃.

[0012] As a further explanation of the present invention, it also includes: Pharmaceutical addition unit; The reagent addition unit is connected to the double-helix mixing unit, and the treatment reagent is added to the double-helix mixing unit through the reagent addition unit.

[0013] As a further explanation of the present invention, the agent addition unit consists of an agent tank, a metering pump and an atomizing nozzle; The reagent tank contains the treatment agent, and the atomizing nozzle is installed in the double helix mixing unit. The treatment agent in the reagent tank is accurately delivered to the atomizing nozzle through a metering pump and connecting pipeline, thus completing the precise addition of the treatment agent in the double helix mixing unit.

[0014] As a further explanation of the present invention, it also includes: a temperature control unit; The temperature control unit is connected to the double-helix mixing unit, and the temperature control unit is used to regulate the processing temperature within the double-helix mixing unit.

[0015] As a further explanation of the present invention, the temperature control unit includes a hot water tank, a temperature sensor, and a heating element; The hot water tank is connected to the double helix mixing unit through a pipe. The temperature sensor is located inside the double helix mixing unit, and the heating tube is located inside the hot water tank. The heating temperature is controlled by the cooperation of the temperature sensor and the heating tube.

[0016] Compared with the prior art, the present invention has the following advantages: The hot water washing system for oily sludge in this invention includes a feeding unit, a double-helix mixing unit, and a disc centrifugal separation unit connected in sequence. The double-helix mixing unit adopts a horizontal double-helix structure to achieve efficient convective mixing of oily sludge with hot water and chemicals. The disc centrifugal separation unit completes rapid separation of oil-water-sludge three phases through high-speed rotation. At the same time, the temperature of the material in the mixing unit can be adjusted in real time by the temperature control unit, and the cleaning agent can be precisely proportioned by the chemical addition unit. This system has a high degree of integration, improves the mixing uniformity by 20%-30%, and increases the separation efficiency by 15%-25% compared with conventional equipment. It is suitable for the efficient and harmless treatment of various types of industrial oily sludge. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the double-helix stirring and mixing unit of the present invention; Figure 3 This is a schematic diagram of the overall structure of the present invention arranged inside a container.

[0018] Explanation of reference numerals in the attached figures: 1-Feeding unit; 11-Conveyor; 12-Filter screen; 2-Double spiral mixing unit; 21-Horizontal tank; 22-Spiral shaft; 23-Spiral blade; 24-Jacketed heating chamber; 3-Disc centrifugal separation unit; 31-Drum; 32-Oil outlet; 33-Drain outlet; 34-Slag outlet; 4-Reagent addition unit; 41-Reagent tank; 42-Metering pump; 43-Atomizing nozzle; 5-Temperature control unit; 51-Hot water tank; 52-Temperature sensor; 53-Heating tube; 6-Feed pump. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. The specific embodiments described herein are only used to explain the invention and are not intended to limit the invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] like Figure 1-3 As shown, the present invention provides a technical solution: a hot water washing system for oily sludge that integrates a double helix mixer and a disc centrifuge, comprising a feeding unit 1, a double helix mixing unit 2, and a disc centrifugation separation unit 3; The feeding unit 1 feeds material into the double helix mixing unit 2. The inlet of the disc centrifugal separation unit 3 is connected to the outlet of the double helix mixing unit 2 through the feeding pump 6. The disc centrifugal separation unit 3 performs centrifugal separation on the sludge processed by the double helix mixing unit 2.

[0021] In this embodiment, the feeding unit 1 consists of a conveyor 11 and a filter screen 12. The filter screen 12 has a pore size of 3-5mm. The conveyor 11 is a belt conveyor, a screw feeder, or a belt conveyor. The oil sludge screened by the filter screen 12 is fed into the double helix mixing unit 2 through the conveyor 11.

[0022] In this embodiment, the double-helix mixing unit 2 includes a horizontal tank 21, a helical shaft 22, and helical blades 23. There are two helical shafts 22, which are arranged in parallel within the horizontal tank 21. The rotational speed of the helical shafts 22 is 50-80 r / min. Each helical shaft 22 is provided with a helical blade 23. The pitch of the helical blade 23 is 180-220 mm. The gap between the helical blade 23 and the inner wall of the horizontal tank 21 is 3-5 mm. The helical blade 23 adopts a variable pitch design, with the pitch at the feed end being smaller than that at the discharge end.

[0023] In this embodiment, a jacketed heating cavity 24 is provided on the outer side of the horizontal tank 21.

[0024] In this embodiment, the disc centrifugal separation unit 3 is a three-phase disc centrifuge. The drum 31 of the disc centrifugal separation unit 3 is located at the bottom, and the rotation speed of the drum 31 is 5500-7000 r / min, and the separation factor is 4500-6500. The top of the disc centrifugal separation unit 3 is provided with an oil outlet 32, the middle of the disc centrifugal separation unit 3 is provided with a drain outlet 33, and the bottom of the disc centrifugal separation unit 3 is provided with a slag discharge outlet 34. A heating and heat preservation sleeve is provided on the outside of the slag discharge outlet 34, and the temperature of the heating and heat preservation sleeve is 50-60℃.

[0025] In this embodiment, it also includes: a drug addition unit 4; The agent addition unit 4 is connected to the double helix mixing unit 2. The agent addition unit 4 adds the treatment agent into the double helix mixing unit 2. The agent addition unit 4 consists of an agent tank 41, a metering pump 42 and an atomizing nozzle 43. Specifically, the reagent tank 41 contains the treatment agent, and the atomizing nozzle 43 is installed in the horizontal tank 21 of the double helix mixing unit 2. The treatment agent in the reagent tank 41 is accurately delivered to the atomizing nozzle 43 through the metering pump 42 and the connecting pipeline, thus completing the precise addition of the treatment agent in the double helix mixing unit 2.

[0026] In this embodiment, a temperature control unit 5 is also included; the temperature control unit 5 is connected to the double helix mixing unit 2, and the temperature control unit 5 is used to regulate the processing temperature in the double helix mixing unit 2.

[0027] The temperature control unit 5 includes a hot water tank 51, a temperature sensor 52, and a heating element 53; Specifically, the hot water tank 51 is connected to the jacketed heating chamber 24 of the double helix mixing unit 2 through a pipe. The temperature sensor 52 is located inside the horizontal tank 21 of the double helix mixing unit 2, and the heating tube 53 is located inside the hot water tank 51. The heating temperature is controlled by the cooperation of the temperature sensor 52 and the heating tube 53.

[0028] Example 1, for the treatment of light oil sludge, is applicable to light oil sludge with an oil content of 20%-30% and a water content of 15%-20%, such as refinery scum oil sludge.

[0029] The conveyor 11 of the feeding unit 1 is a belt conveyor with a conveying speed set at 1.5m / min. It feeds the light oil sludge into the feed inlet of the double spiral mixing unit 2 at a uniform speed. The filter screen 12 above the conveyor has a hole diameter of 5mm to prevent impurities from entering the subsequent units.

[0030] The horizontal tank 21 of the double helix mixing unit 2 has a length of 4m and an inner diameter of 0.8m; the two helical shafts 22 rotate at a speed of 60r / min, the pitch of the helical blades 23 is 200mm, and the gap between the helical blades 23 and the horizontal tank 21 is 5mm. Temperature control unit 5 introduces 80℃ hot water through jacketed heating chamber 24 to stabilize the material temperature in horizontal tank 21 at 75-80℃. In the agent addition unit 4, a nonionic surfactant, such as fatty alcohol polyoxyethylene ether, is added at 3% of the mass of the sludge. The surfactant is then evenly sprayed into the cavity of the horizontal tank 21 through the atomizing nozzle 43. The material stays in the double helix mixing unit 2 for 8 minutes to achieve full emulsification and mixing of the sludge, agent, and hot water. The disc centrifugal separation unit 3, with a rotating drum 31, operates at a speed of 6000 r / min and a separation factor of 5000; the mixed sludge slurry passes through a flow rate of 20 m³ / min. 3 The feed pump 6 delivers the feed into the centrifuge at a rate of / h. Under the action of centrifugal force, the light phase crude oil is discharged from the top oil outlet 32, the middle phase washing water is discharged from the middle drain outlet 33, and the heavy phase oil sludge residue is discharged from the bottom sludge outlet 34. The sludge discharge cycle is set to 2min / time, and the oil content of the residue is reduced to below 3%.

[0031] Example 2: Treatment of heavy oil sludge. This example is applicable to heavy oil sludge with an oil content of 15%-25%, a water content of 10%-15%, and a solid content of 60%-70%, such as oilfield sludge.

[0032] The feeding unit 1 conveyor 11 adopts a screw feeder with a diameter of 300mm, a speed of 40r / min, and a feeding rate of 10t / h. The feeder outlet is equipped with a crushing device, a toothed crusher, with a crushing particle size ≤10mm, which crushes the agglomerated sludge and sends it into the double screw mixing unit. The horizontal tank 21 of the double helix mixing unit 2 is 5m long and 1.0m in inner diameter; the speed of the helical shaft 22 is adjusted to 80r / min, and the helical blades 23 adopt a variable pitch design with a pitch of 180mm at the feed end and 220mm at the discharge end to enhance the material pushing and mixing intensity. Temperature control unit 5 raises the hot water temperature in jacket heating chamber 24 to 90℃, so that the temperature inside horizontal tank 21 is maintained at 85-90℃; The reagent addition unit 4 is prepared with 5% of the oil sludge mass as the reagent, 4% sodium hydroxide + 1% sodium dodecylbenzene sulfonate. After being premixed with hot water through a pipeline mixer, it is injected into the horizontal tank 21. The material residence time is extended to 12 minutes to ensure that the heavy oil is fully stripped. The disc centrifugal separation unit 3 uses a high-capacity three-phase disc centrifuge with a drum speed of 7000 r / min and a separation factor of 6500. The flow rate of feed pump 6 is set to 15m³ / h. 3 / h, a heating and insulation jacket is installed at the slag discharge port 34 at a temperature of 60℃ to prevent heavy residue from clumping and clogging; after separation, the oil content of the residue is reduced to below 2.5%, and the water content of the recovered oil is ≤0.5%.

[0033] Example 3: Mobile Integrated Processing System. This example addresses dispersed oil sludge in the field, such as leaking oil sludge from oil pipelines, and is designed as a mobile containerized system. Figure 3 As shown, the overall dimensions are compatible with a 40-foot container.

[0034] Feeding unit 1: Employs a small hydraulic grab bucket with a capacity of 0.5m³. 3 Conveyor 11 is a belt conveyor with a length of 3m and a speed of 1m / min, which enables flexible feeding of oil sludge; The horizontal tank 21 of the double helix mixing unit 2 is 3m long and 0.6m in inner diameter, and is made of 304 stainless steel; the helix shaft 22 rotates at 50r / min, and the bottom of the horizontal tank 21 is equipped with a drain valve with a diameter of 50mm for easy system cleaning. The temperature control unit 5 uses electric heating with a total power of 30kW. It uses temperature sensor 52 to adjust the temperature in real time with an accuracy of ±1℃, stabilizing the material temperature at 70-75℃. The reagent tank 41 of the reagent addition unit 4 is a portable reagent tank with a capacity of 200L. The flow rate of the reagent addition is 0-50L / h through the metering pump 42, which precisely controls the amount of reagent added. The disc centrifugal separation unit 3 uses a small three-phase disc centrifuge, with a floor area of ​​1.5m×1.0m. The rotation speed of the drum 31 is 5500r / min, and the separation factor is 4500. The system is equipped with a small oil storage tank with a capacity of 500L and a water storage tank with a capacity of 1000L to realize temporary storage of oil and water. The entire system is powered by the power distribution box in the container and can be connected to 380V industrial power. The amount of oil sludge processed per shift can reach 50t, which meets the needs of rapid processing of dispersed oil sludge in the field.

[0035] It should be further noted that the accompanying drawings and embodiments of the present invention mainly describe the concept of the present invention. Based on this concept, some specific forms and arrangements of connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, under the premise that those skilled in the art understand the concept of the present invention, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0036] When a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0037] The directional terms "inner" and "outer" refer to the inner and outer sides relative to the outline of each component itself. The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," or "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention 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. Therefore, they should not be construed as limitations on the present invention.

[0038] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hot water washing system for oily sludge, combining a double-spiral mixer and a disc centrifuge, characterized in that, include; Feeding unit (1) The double helix mixing unit (2) is used for feeding the material into the double helix mixing unit (2) by the feeding unit (1); The disc centrifugal separation unit (3) has its inlet connected to the outlet of the double spiral mixing unit (2) via a feed pump (6). The disc centrifugal separation unit (3) performs centrifugal separation of the sludge processed by the double spiral mixing unit (2).

2. The oil sludge hot water washing system integrating a double-helix mixer and a disc centrifuge according to claim 1, characterized in that, The feeding unit (1) consists of a conveyor (11) and a filter screen (12). The filter screen (12) has a pore size of 3-5 mm. The oil sludge screened by the filter screen (12) is fed into the double helix mixing unit (2) by the conveyor (11).

3. The oil sludge hot water washing system integrating a double-helix mixer and a disc centrifuge according to claim 2, characterized in that, The conveyor (11) is a belt conveyor, a screw feeder or a belt conveyor.

4. The oil sludge hot water washing system integrating a double-helix mixer and a disc centrifuge according to claim 2, characterized in that, The double-helix mixing unit (2) includes a horizontal tank (21), a helical shaft (22) and helical blades (23). There are two helical shafts (22), and the two helical shafts (22) are arranged in parallel inside the horizontal tank (21). The rotation speed of the helical shafts (22) is 50-80 r / min. Each helical shaft (22) is provided with a helical blade (23). The pitch of the helical blades (23) is 180-220 mm. The gap between the helical blades (23) and the inner wall of the horizontal tank (21) is 3-5 mm. The helical blades (23) adopt a variable pitch design, with the pitch at the feed end being smaller than that at the discharge end.

5. The hot water washing system for oily sludge, which combines a double-helix mixer and a disc centrifuge according to claim 4, is characterized in that... The horizontal tank (21) is provided with a jacketed heating cavity (24) on its outer side.

6. The hot water washing system for oily sludge, which combines a double-helix mixer and a disc centrifuge according to claim 4, is characterized in that... The disc centrifugal separation unit (3) is a three-phase disc centrifuge. The drum (31) of the disc centrifugal separation unit (3) is located at the bottom, and the rotation speed of the drum (31) is 5500-7000 r / min, and the separation factor is 4500-6500. The disc centrifugal separation unit (3) has an oil outlet (32) at the top, a drain outlet (33) in the middle, a slag outlet (34) at the bottom, and a heating and heat preservation sleeve on the outside of the slag outlet (34). The temperature of the heating and heat preservation sleeve is 50-60℃.

7. A hot water washing system for oily sludge combining a double-helix mixer and a disc centrifuge according to any one of claims 1-6, characterized in that, Also includes: Drug addition unit (4); The agent addition unit (4) is connected to the double helix mixing unit (2), and the agent is added to the double helix mixing unit (2) through the agent addition unit (4).

8. The hot water washing system for oily sludge, which integrates a double-spiral mixer and a disc centrifuge according to claim 7, is characterized in that... The agent addition unit (4) consists of an agent tank (41), a metering pump (42), and an atomizing nozzle (43); The reagent tank (41) contains the treatment agent, and the atomizing nozzle (43) is set in the double helix mixing unit (2). The treatment agent in the reagent tank (41) is accurately delivered to the atomizing nozzle (43) through the metering pump (42) and the connecting pipeline, so as to complete the precise addition of the treatment agent in the double helix mixing unit (2).

9. A hot water washing system for oily sludge combining a double-helix mixer and a disc centrifuge according to any one of claims 1-6, characterized in that, Also includes: Temperature control unit (5); The temperature control unit (5) is connected to the double helix mixing unit (2), and the temperature control unit (5) is used to regulate the processing temperature in the double helix mixing unit (2).

10. The hot water washing system for oily sludge, which integrates a double-spiral mixer and a disc centrifuge according to claim 9, is characterized in that... The temperature control unit (5) includes a hot water tank (51), a temperature sensor (52), and a heating element (53); The hot water tank (51) is connected to the double helix mixing unit (2) through a pipe. The temperature sensor (52) is located inside the double helix mixing unit (2). The heating tube (53) is located inside the hot water tank (51). The heating temperature is controlled by the cooperation of the temperature sensor (52) and the heating tube (53).

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