A sludge extraction system

Abstract

This invention discloses an oil sludge extraction system, comprising a separation tower, multiple partition units, and an inlet pipe. The separation tower includes a feed section and an extraction section from top to bottom. The feed section has an inlet and an outlet. The inlet is for the oil sludge and extraction solvent to enter. The extraction section is used to extract light tar from the oil sludge and has a light oil outlet for discharging the light tar. The multiple partition units are spaced apart from top to bottom within the extraction section. Each partition unit includes multiple partition tubes spaced apart along a first direction and extending along a second direction. The inlet pipe is located on the separation tower and extends one end into the extraction section. The pipe wall of the inlet pipe has multiple spaced-apart vents for introducing heating gas into the extraction section. The oil sludge extraction system of this invention has the advantages of high oil yield.

Description

Technical Field

[0001] This invention relates to the field of sludge pyrolysis technology, and more specifically to an sludge extraction system. Background Technology

[0002] Oil sludge is an oil-containing solid waste generated during oilfield drilling, extraction, transportation, refining, and oily wastewater treatment. It contains a large amount of harmful substances, therefore, effective and timely treatment is necessary to avoid serious harm to the ecological environment. Oil sludge is generally treated using pyrolysis, which breaks it down into pyrolysis residue, pyrolysis liquid, and pyrolysis oil and gas, thus achieving resource utilization of the oil sludge.

[0003] In related technologies, before pyrolysis, oil sludge is typically placed in a washing device equipped with a drum screen, and a certain amount of surfactant is added. The drum screen rotates at a certain speed to wash the oil sludge, separating and recovering the light tar. The washed oil sludge residue then enters a subsequent process for the separation and recovery of heavy tar. However, when separating light tar from the oil sludge, the drum screen cannot guarantee that the oil sludge will not have dead zones and will be completely in a turbulent washing state within the washing device. This reduces the oil yield of light tar, and consequently, the oil yield of the oil sludge. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose an oil sludge extraction system with high oil yield.

[0005] The sludge extraction system of this invention includes a separation tower, a multi-layer separation unit, and an air inlet pipe. The separation tower includes a feeding section and an extraction section from top to bottom. The feeding section has a feed inlet and an exhaust outlet. The feed inlet is used for the sludge and extraction solvent to enter. The extraction section is used to extract light tar from the sludge. The extraction section has a light oil outlet for discharging the light tar.

[0006] The multiple separation units are spaced apart in the extraction section from top to bottom. Each separation unit includes multiple separation tubes spaced apart in a first direction and extending in a second direction, wherein the first direction is perpendicular to the second direction.

[0007] The air inlet pipe is installed on the separation tower and one end extends into the extraction section. The pipe wall of the air inlet pipe has a plurality of spaced air outlets, which are used to introduce heating gas into the extraction section.

[0008] In some embodiments, the separator tube is an arc-shaped tube with the arc-shaped opening facing downwards.

[0009] In some embodiments, multiple partition tubes in two adjacent partition units are staggered in the first direction.

[0010] In some embodiments, the air inlet pipe extends horizontally into the extraction section, and the extension direction of the air inlet pipe is perpendicular to the extension direction of the separator pipe.

[0011] In some embodiments, the number of air inlets is multiple, and the multiple air inlets are arranged at intervals in the vertical direction; the sludge extraction system also includes a distribution pipe, which is located outside the separation tower and extends in the vertical direction, and the inlet end of the air inlets is connected to the distribution pipe.

[0012] In some embodiments, the sludge extraction system of the present invention further includes a guide plate, which is disposed in the feed section and located below the feed inlet. The guide plate is inclined relative to the horizontal plane, and the angle between the guide plate and the horizontal plane is 30°-45°.

[0013] In some embodiments, the separation tower further includes a separation section located below the extraction section, wherein a heating tube assembly is provided in the separation section for heating the sludge discharged from the extraction section to separate the heavy tar from the sludge, and the separation section has a discharge port.

[0014] In some embodiments, the heating tube assembly includes a steam inlet pipe, a steam distribution pipe, and a steam outlet pipe. One end of both the steam inlet pipe and the steam outlet pipe extends horizontally into the separation section. The steam inlet pipe and the steam outlet pipe are arranged at intervals in the vertical direction. The steam distribution pipe is located in the separation section and communicates with both the steam inlet pipe and the steam outlet pipe. The steam inlet pipe is used for superheated steam to enter, and the superheated steam after heat exchange is discharged through the steam outlet pipe.

[0015] In some embodiments, the number of steam distribution pipes is multiple, and the multiple steam distribution pipes are arranged at intervals in the extension direction of the air intake pipe.

[0016] In some embodiments, the sludge extraction system of the present invention further includes a distillation device and a pyrolysis device. The distillation device is connected to the discharge port to receive the mixture and sludge discharged from the separation section. The distillation device is used to separate the extraction solvent and heavy tar in the mixture by distillation. The distillation device has a solvent outlet, a heavy oil outlet and a sludge outlet. The solvent outlet is connected to the feed port.

[0017] The pyrolysis device is connected to the oil sludge outlet to receive the oil sludge discharged from the distillation device. The pyrolysis device is used to pyrolyze the oil sludge to generate pyrolysis oil gas. The pyrolysis device has a pyrolysis oil gas outlet, which is connected to the air inlet pipe to transport the pyrolysis oil gas as a heating gas to the extraction section.

[0018] In the oil sludge extraction system of this invention, the heat introduced by the heating gas can heat the extraction solvent to reduce the surface tension of the extraction solvent, making it easier for light tar to be extracted from the oil sludge, accelerating the separation of light tar from the sludge, and improving the oil yield of light tar from the oil sludge.

[0019] Because the multi-layered separators are spaced vertically within the extraction section, the sludge and extraction solvent are agitated and diverted by the separators in each unit as they pass through, resulting in more uniform dispersion of the sludge and solvent within the extraction section. This facilitates sufficient contact between the solvent and sludge, leading to a more thorough extraction process and increasing the yield of light tar from the sludge. Furthermore, the introduction of heated gas into the extraction section through the inlet vent enhances the turbulent contact between the sludge and solvent, ensuring a comprehensive extraction process without dead zones. This further promotes more uniform mixing of the sludge and solvent under the agitation of the heated gas, further improving the yield of light tar. The light tar produced in the extraction section is discharged through the light oil outlet, thus completing the recovery of light tar. The heated gas is discharged through the exhaust port after heat exchange. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the sludge extraction system according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the separation tower according to an embodiment of the present invention.

[0022] Figure 3 This is a top view of the separation tower according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the intake pipe and the separator unit according to an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the installation of the heating tube assembly according to an embodiment of the present invention.

[0025] Figure 6 This is a structural schematic diagram of an embodiment of the present invention.

[0026] Figure label:

[0027] 100. Oil sludge extraction system; 1. Separation tower; 101. Feed section; 1011. Feed inlet; 1012. Exhaust outlet; 102. Extraction section; 1021. Light oil outlet; 103. Separation section; 1031. Discharge outlet; 2. Separation unit; 201. Separation pipe; 3. Air inlet pipe; 301. Air outlet; 4. Distribution pipe; 5. Baffle plate; 6. Heating tube assembly; 601. Steam inlet pipe; 602. Steam distribution pipe; 603. Steam outlet pipe; 7. Distillation unit; 701. Solvent outlet; 702. Heavy oil outlet; 703. Oil sludge outlet; 8. Pyrolysis unit; 801. Pyrolysis oil and gas outlet. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] like Figures 1 to 6 As shown, the sludge extraction system 100 of this embodiment includes a separation tower 1, a multi-layer separation unit 2, and an air inlet pipe 3. The separation tower 1 includes a feed section 101 and an extraction section 102 along a top-to-bottom direction. The feed section 101 has a feed inlet 1011 and an exhaust outlet 1012. The feed inlet 1011 is used for the sludge and extraction solvent to enter. The extraction section 102 is used to extract light tar from the sludge and has a light oil outlet 1021 for discharging the light tar. The multi-layer separation unit 2 is spaced apart within the extraction section 102 along a top-to-bottom direction. The separation unit 2 includes multiple separation pipes 201 spaced apart along a first direction, and the separation pipes 201 extend along a second direction, wherein the first direction is perpendicular to the second direction. An inlet pipe 3 is installed on the separation tower 1 and one end extends into the extraction section 102. The pipe wall of the inlet pipe 3 has multiple spaced-apart outlet holes 301, which are used to introduce heating gas into the extraction section 102. For example, the first direction is the length direction of the separation tower 1, and the second direction is the width direction of the separation tower 1.

[0030] In use, the sludge extraction system 100 of this embodiment of the invention introduces sludge and extraction solvent into the feed section 101 through the feed inlet 1011, and then into the extraction section 102 through the feed section 101. After the sludge and extraction solvent mix and enter the extraction section 102, they flow downwards layer by layer from the space between two adjacent separator pipes 201 of the separator unit 2. During this flow, they exchange heat with the heating gas entering the extraction section 102 through the air inlet pipe 3. The heat introduced by the heating gas heats the extraction solvent, reducing its surface tension and making it easier to extract light tar from the sludge, accelerating the separation of light tar from the sludge, and improving the oil yield of the light tar from the sludge.

[0031] Because the multi-layered separation units 2 are spaced vertically within the extraction section 102, the sludge and extraction solvent are agitated and diverted by the separation pipes 201 in each separation unit 2 as they pass through, resulting in a more uniform dispersion of the sludge and extraction solvent within the extraction section 102. This facilitates sufficient contact between the extraction solvent and the sludge, making the extraction process more thorough and increasing the oil yield of light tar from the sludge. Furthermore, heating gas is introduced into the extraction section 102 through the outlet 301 of the inlet pipe 3, increasing the turbulent contact between the sludge and the extraction solvent. The entire extraction process proceeds omnidirectionally, without any dead zones, allowing the sludge and extraction solvent to mix more evenly under the agitation of the heating gas, further contributing to a higher oil yield of light tar. The light tar produced in the extraction section 102 is discharged through the light oil outlet 1021, thus completing the recovery of light tar. The heating gas is discharged through the exhaust port 1012 after heat exchange.

[0032] Optionally, the cross-section of the separation tower 1 is square, with a length of 1m-3m and a height of 4m-6m. The cross-section of the feed inlet 1011 is either circular or square, with the diameter of the circle or the side length of the square being 1 / 6-1 / 4 of the length of the separation tower 1.

[0033] Optionally, the height of the extraction section 102 is 3 / 5 to 2 / 3 of the height of the separation tower 1.

[0034] In some embodiments, such as Figure 1 and Figure 2 As shown, the sludge extraction system 100 of this embodiment of the invention also includes a guide plate 5. The guide plate 5 is disposed within the feed section 101 and located below the feed inlet 1011. The guide plate 5 is inclined relative to the horizontal plane, and the angle between the guide plate 5 and the horizontal plane is 30°-45°. For example, the angle between the guide plate 5 and the horizontal plane is 30°, 40°, or 45°. The guide plate 5 is fixed within the feed section 101 by a fastener.

[0035] The sludge extraction system 100 of this invention, by providing a guide plate 5 below the feed inlet 1011, guides the sludge and extraction solvent to form an effective flow path when entering the separation tower 1, avoiding dead zones in the feed section 101 and ensuring the smooth progress of the extraction process. Furthermore, it prevents the sludge and extraction solvent entering through the feed inlet 1011 from directly impacting the separation unit 2 within the extraction section 102 under gravity, thus avoiding damage to the separation unit 2 and improving its reliability.

[0036] In some embodiments, such as Figure 4As shown, the separator 201 is an arc-shaped tube with its arc-shaped opening facing downwards. The arc-shaped design of the separator 201 helps guide the material (the mixture of sludge and extraction solvent) to flow along the surface of the arc-shaped tube, thus reducing friction on the surface and ensuring smooth flow within the extraction section 102, which is beneficial for improving extraction efficiency. Simultaneously, the arc-shaped design also helps reduce the overall dimensions of the separator 201, minimizing its vertical space occupation and resulting in a compact structure and high space utilization of the separation tower 1.

[0037] Optionally, the spacing between two adjacent partition units 2 is 10cm-12cm, and the center-to-center spacing between two adjacent partition tubes 201 in each layer is 30cm-36cm. The partition tube 201 can be a semi-circular arc-shaped tube with a diameter of 10cm-12cm and an opening facing downwards, and its length is the same as that of the separation tower 1.

[0038] Optionally, such as Figure 2 As shown, an air inlet pipe 3 is installed between every two partition units 2. The diameter of the air inlet pipe 3 is 10cm-20cm, and the length is 0.8m-2.8m. The air inlet pipe 3 has multiple sets of air outlet holes 301 with a diameter of 3mm-6mm in its axial direction. The center-to-center distance between the air outlet holes 301 in each set is 1mm-18mm. The number of air outlet holes 301 along the circumference of the air inlet pipe 3 is 20-40, and the air velocity at the air outlet holes 301 is controlled at 30m·s. -1 -40m·s -1 .

[0039] In some embodiments, such as Figure 3 As shown, the intake pipe 3 extends horizontally into the extraction section 102, and the extension direction of the intake pipe 3 is perpendicular to the extension direction of the separator pipe 201.

[0040] This design helps the intake pipe 3 to evenly distribute the heating gas within the extraction section 102, allowing for better mixing of the heating gas and improving the extraction efficiency of light tar. Simultaneously, the extension direction of the intake pipe 3 is perpendicular to the extension direction of the separator pipe 201, preventing the heating gas from directly contacting the sludge inlet 1011, thus reducing interference from the sludge and maintaining stable operation of the extraction section 102.

[0041] In some embodiments, such as Figure 2 As shown, there are multiple air inlet pipes 3, which are arranged at intervals in the vertical direction. The sludge extraction system 100 of this embodiment of the invention also includes a distribution pipe 4, which is located outside the separation tower 1 and extends in the vertical direction. The inlet end of the air inlet pipe 3 is connected to the distribution pipe 4.

[0042] The sludge extraction system 100 of this embodiment of the invention, by setting multiple air inlet pipes 3, can ensure a more uniform distribution of heating gas within the extraction section 102, thereby improving the extraction efficiency of light tar. Furthermore, the inlet end of the air inlet pipe 3 is connected to the distribution pipe 4. This design facilitates unified control and adjustment of the multiple air inlet pipes 3. Through the distribution pipe 4, the inlet position and heating gas flow rate of the air inlet pipe 3 can be easily adjusted to adapt to different extraction requirements.

[0043] This design also helps reduce system complexity because the number of connecting pipes between the inlet pipe 3 and the inside of the separation tower 1 can be reduced through the distribution pipe 4. At the same time, the arrangement of the distribution pipe 4 makes the layout of the inlet pipe 3 more flexible, allowing the position and number of the inlet pipe 3 to be adjusted according to actual conditions to achieve the best extraction effect.

[0044] In some embodiments, the separation tower 1 further includes a separation section 103 located below the extraction section 102. The separation section 103 is provided with a heating tube assembly 6, which is used to heat the sludge discharged from the extraction section 102 to separate the heavy tar from the sludge. The separation section 103 has a discharge port 1031.

[0045] The heating tube assembly 6 ensures that the sludge discharged from the extraction section 102 is adequately heated, reducing the viscosity of the heavy tar in the sludge and making it easier to separate. Simultaneously, the layout and heating temperature of the heating tube assembly 6 are adjustable to meet the extraction requirements of different types and concentrations of sludge. The sludge and extraction mixture is discharged from the outlet 1031. The heavy tar mixed in the extraction mixture undergoes further processing to separate from the extraction solvent. The oil yield from the sludge is the mixture of light tar and heavy tar.

[0046] Optionally, the height of the separation section 103 is 1 / 5 to 1 / 4 of the height of the separation tower 1.

[0047] In some embodiments, such as Figure 2 , Figure 4 and Figure 6 As shown, the heating tube assembly 6 includes a steam inlet pipe 601, a steam distribution pipe 602, and a steam outlet pipe 603. One end of both the steam inlet pipe 601 and the steam outlet pipe 603 extends horizontally into the separation section 103. The steam inlet pipe 601 and the steam outlet pipe 603 are arranged at intervals in the vertical direction. The steam distribution pipe 602 is located within the separation section 103 and communicates with both the steam inlet pipe 601 and the steam outlet pipe 603. The steam inlet pipe 602 is used for the entry of superheated steam, and the superheated steam after heat exchange is discharged through the steam outlet pipe 603.

[0048] For example, the superheated steam temperature in the steam inlet pipe 601 is 350℃-450℃, and the superheated steam temperature in the steam outlet pipe 603 is 290℃-390℃. The purpose of the superheated steam is to further improve the extraction of heavy tar from the sludge by the extraction solvent through a partitioned heat exchange method, thereby increasing the yield of heavy tar oil.

[0049] Both the inlet pipe 601 and the outlet pipe 603 extend horizontally into the separation section 103. The inlet pipe 601 and the outlet pipe 603 are arranged at intervals in the vertical direction. The function of the steam distribution pipe 602 is to guide the superheated steam to be evenly distributed within the separation section 103, ensuring sufficient contact with the oil sludge, thereby improving the heating and separation effects. The separation process can be optimized by adjusting the layout and flow rate of the inlet pipe 601 and the outlet pipe 603.

[0050] Optionally, such as Figure 5 As shown, there are multiple heating tube assemblies 6, which are arranged at intervals in the horizontal direction. The distance between two adjacent heating tube assemblies 6 is 10cm-15cm. The center distance between the steam inlet pipe 601 and the steam outlet pipe 603 is 0.4m-0.6m. The diameter of the steam inlet pipe 601 and the steam outlet pipe 603 is 4cm-8cm.

[0051] In some embodiments, such as Figure 5 As shown, there are multiple steam distribution pipes 602, and multiple connecting pipes are arranged at intervals in the extension direction of the air inlet pipe 3. By setting multiple steam distribution pipes 602, the heat exchange area with the sludge and extraction solvent can be increased, thereby improving the heating effect in the separation section 103, which in turn helps to improve the separation effect of heavy tar in the separation section 103.

[0052] Optionally, the diameter of the steam distribution pipe 602 is 1.5cm-2.5cm, and the center-to-center distance between two adjacent steam distribution pipes 602 is 5cm-10cm.

[0053] In some embodiments, such as Figure 1 As shown, the sludge extraction system 100 of this embodiment of the invention further includes a distillation device 7 and a pyrolysis device 8. The distillation device 7 is connected to the discharge port 1031 to receive the mixture and sludge discharged from the separation section 103. The distillation device 7 is used to distill and separate the extraction solvent and heavy tar in the mixture. The distillation device 7 has a solvent outlet 701, a heavy oil outlet 702 and a sludge outlet 703. The solvent outlet 701 is connected to the feed port 1011.

[0054] The pyrolysis device 8 is connected to the sludge outlet 703 to receive the sludge discharged from the distillation device 7. The pyrolysis device 8 is used to pyrolyze the sludge to generate pyrolysis oil gas. The pyrolysis device 8 has a pyrolysis oil gas outlet 801, which is connected to the air inlet pipe 3 to transport the pyrolysis oil gas as heating gas to the extraction section 102.

[0055] The function of distillation unit 7 is to separate the extraction solvent and heavy tar in the mixture by distillation, thereby realizing the recovery of the extraction solvent and the recovery of heavy tar. The extraction solvent recovered by distillation unit 7 is returned to separation tower 1 for further extraction, which can realize the recycling of extraction solvent and reduce solvent consumption.

[0056] The function of the pyrolysis unit 8 is to pyrolyze the oil sludge to generate pyrolysis oil gas, which is then transported to the extraction section 102 as heating gas. This design not only achieves the harmless treatment of the oil sludge but also effectively utilizes the heat generated during the pyrolysis process as a heating energy source for the extraction section 102, thereby improving the thermal efficiency of the system.

[0057] The sludge extraction system 100 of this invention can separate light tar and heavy tar in sludge, recover extraction solvent, pyrolyze sludge residue, and use the pyrolysis oil gas generated from the pyrolysis of sludge residue as heating gas, thus realizing the comprehensive utilization of resources and meeting the environmental protection requirements of the treatment process. This system design not only improves the treatment effect of sludge, but also has good economic and environmental benefits, achieving an oil yield (36-45% wt) during sludge pretreatment, which is much higher than the oil yield (25-38% wt) of chemical washing.

[0058] In the description of this invention, 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," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 this invention.

[0059] Furthermore, 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 at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. An oil sludge extraction system, characterized in that, include: A separation tower, comprising a feed section and an extraction section in a top-to-bottom direction, wherein the feed section has a feed inlet and an exhaust outlet, the feed inlet is for the entry of sludge and extraction solvent, the extraction section is for extracting light tar from the sludge, and the extraction section has a light oil outlet for discharging the light tar. The extraction section includes multiple layers of separation units, spaced apart from top to bottom. Each separation unit comprises multiple separation tubes spaced apart along a first direction. The separation tubes are arc-shaped with their arc-shaped openings facing downwards. The separation tubes extend along a second direction, wherein the first direction is perpendicular to the second direction. An inlet pipe is mounted on the separation tower and extends into the extraction section at one end. The inlet pipe has multiple spaced-apart outlets on its wall for introducing heating gas into the extraction section. Multiple separation tubes in adjacent layers of separation units are staggered along the first direction. The inlet pipe extends horizontally into the extraction section, and its extension direction is perpendicular to the extension direction of the separation tubes.

2. The sludge extraction system according to claim 1, characterized in that, The number of air inlet pipes is multiple, and the multiple air inlet pipes are arranged at intervals in the vertical direction; the sludge extraction system also includes a distribution pipe, which is located outside the separation tower and extends in the vertical direction, and the inlet end of the air inlet pipe is connected to the distribution pipe.

3. The sludge extraction system according to claim 1, characterized in that, It also includes a guide plate, which is disposed in the feeding section and located below the feeding port. The guide plate is inclined relative to the horizontal plane, and the angle between the guide plate and the horizontal plane is 30°-45°.

4. The sludge extraction system according to any one of claims 1-3, characterized in that, The separation tower also includes a separation section located below the extraction section. The separation section is equipped with a heating tube assembly, which is used to heat the sludge discharged from the extraction section to separate the heavy tar from the sludge. The separation section has a discharge port.

5. The sludge extraction system according to claim 4, characterized in that, The heating tube assembly includes a steam inlet pipe, a steam distribution pipe, and a steam outlet pipe. One end of both the steam inlet pipe and the steam outlet pipe extends horizontally into the separation section. The steam inlet pipe and the steam outlet pipe are arranged at intervals in the vertical direction. The steam distribution pipe is located in the separation section and is connected to both the steam inlet pipe and the steam outlet pipe. The steam inlet pipe is used for superheated steam to enter, and the superheated steam after heat exchange is discharged through the steam outlet pipe.

6. The sludge extraction system according to claim 5, characterized in that, The number of steam distribution pipes is multiple, and the multiple steam distribution pipes are arranged at intervals in the extension direction of the air intake pipe.

7. The sludge extraction system according to claim 4, characterized in that, Also includes: A distillation apparatus, connected to the outlet, for receiving the mixture and sludge discharged from the separation section, the distillation apparatus for separating the extraction solvent and heavy tar in the mixture by distillation, the distillation apparatus having a solvent outlet, a heavy oil outlet, and a sludge outlet, the solvent outlet being connected to the inlet; and A pyrolysis device is connected to the oil sludge outlet to receive the oil sludge discharged from the distillation device. The pyrolysis device is used to pyrolyze the oil sludge to generate pyrolysis oil gas. The pyrolysis device has a pyrolysis oil gas outlet, which is connected to the air inlet pipe to transport the pyrolysis oil gas as a heating gas to the extraction section.

Images