A continuous oil sludge bag pretreatment system and process

Abstract

The present application belongs to the technical field of oil sludge treatment, and particularly relates to a continuous oil sludge bag pretreatment system and process. In view of the intermittent operation of the existing oil sludge bag pretreatment system, the low processing efficiency and high energy consumption, the present application adopts the following technical scheme: a continuous oil sludge bag pretreatment system, comprising: a sorting station; a conveyor; a crusher; a discharging device; a feeder; an oil residue screening machine; a residue discharging device; an oil discharging device; an oil gas collecting device; a steam system; wherein, the sorting station is used for sorting the oil sludge bag; the oil residue screening machine is used for separating the coarse residue and the oil sludge slurry during the rotation of conveying the oil sludge; the residue discharging device is used for collecting the separated coarse residue; the oil discharging device is used for collecting the separated oil; the oil discharging device is used for conveying the oil sludge slurry to the storage tank; and the oil gas collecting device is used for collecting the waste gas generated by the oil residue screening machine and the waste gas in the residue discharging device. The present application has the effect of realizing continuous production, high production efficiency and high energy utilization rate.

Description

A continuous sludge pretreatment system and process Technical Field

[0001] This invention belongs to the field of oil sludge treatment technology, specifically relating to a continuous oil sludge pretreatment system and process. Background Technology

[0002] The applicant disclosed an oil sludge treatment system in Chinese invention patent application publication number CN115403243A, including an oil sludge hot water washing system and an oil sludge oil washing system. The oil sludge hot water washing system includes: a dosing device; an oil removal device; an oil floating device; a hot water first three-phase separation device; and a semi-finished oil conveying pump. The oil sludge oil washing system includes: an oil sludge dissolution primary separation device; an oil sludge primary discharge pump; an oil washing two-phase separation device; an oil sludge secondary separation feed pump; an oil sludge dissolution secondary separation device; an oil sludge secondary separation discharge pump; an oil washing three-phase separation device; a refining device feed pump; an oil refining device; and a refining device discharge pump. The beneficial effects achieved are: hot water washing or oil washing can be selected for different types of oil sludge, reducing the difficulty or cost of treatment and improving the treatment efficiency.

[0003] Before entering the sludge treatment system, the sludge bags need to be pre-treated. The current sludge bag pre-treatment system used by the applicant works roughly as follows: A transport crane places ton bags or drums containing sludge into a pre-fabricated feeding pallet on top of the treatment equipment. Small oil bags inside the ton bags or drums are then manually fed into the treatment equipment. The inner cylinder of the treatment equipment uses steam to directly heat and dissolve the sludge bags. Toothed blades on the inner wall of the cylinder break the oil bags. When the inner cylinder temperature reaches 70℃~90℃, the sludge maintains good fluidity, thus separating the solid and liquid components of the sludge bag. The sludge-oil mixture is then passed through the inner cylinder... The filter screen of the cylinder filters out large solid particles. The cleaner oil sludge enters the next stage filter screen of 1mm to 2mm. The filtered clean oil sludge is temporarily stored in the oil sludge storage tank. After a certain amount is collected, it is pumped to the raw material tank area for preparation and homogenization for the next stage of processing. The generated exhaust gas is extracted from the treatment equipment by the deodorizing exhaust fan and enters the cooling water tank for condensation through the exhaust gas pipeline. The condensed oil-water mixture enters the oil-water separator to achieve oil-water separation. The non-condensable gas that is not absorbed enters the exhaust gas purification device and is discharged into the atmosphere through the discharge cylinder after meeting the standards.

[0004] In the aforementioned pretreatment process for oil sludge, the feeding, sealing, heating, crushing, separation, cooling, slag removal, and oil removal stages constitute an intermittent operation. The processing equipment operates in an intermittent mode, and a single process takes 8-12 hours to complete, resulting in low throughput and high energy consumption. Patents / patent applications such as CN206680358U - A Continuous Oil Sludge Treatment System and CN116102233A - A Continuous, High-Efficiency, and Energy-Saving Oily Sludge Treatment System and Process do not disclose a pretreatment method for the oil sludge bags before oil washing or hot water washing.

[0005] Therefore, it is necessary to improve existing equipment and processes to achieve continuous processing, thereby increasing processing efficiency and reducing energy consumption. Summary of the Invention

[0006] This invention addresses the shortcomings of existing oil sludge bag pretreatment systems, which operate intermittently, have low processing efficiency, and consume a lot of energy. It provides a continuous oil sludge bag pretreatment system and process to achieve continuous processing, improve automation, increase processing efficiency, and reduce energy consumption.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a continuous sludge bag pretreatment system, the continuous sludge bag pretreatment system comprising:

[0008] Sorting station;

[0009] Conveyor;

[0010] Crusher;

[0011] Unloading device;

[0012] Feeder;

[0013] Oil residue screening machine;

[0014] Slag discharge device;

[0015] Oil outlet device;

[0016] Oil and gas collection devices;

[0017] The steam system is connected to the crusher, unloading device, feeder, and oil residue screening machine respectively;

[0018] The system includes a sorting station for sorting sludge bags; a conveyor for delivering the sorted sludge bags to a crusher; a crusher for crushing the sludge bags; a discharge device for quantitatively dropping the crushed material into a feeder; a feeder for feeding the material into an oil residue screening machine; an oil residue screening machine for separating coarse residue and sludge slurry during the rotating conveying process; a slag discharge device for collecting the separated coarse residue; an oil discharge device for collecting the separated sludge slurry and sending it to a storage tank; and an oil and gas collection device for collecting the waste gas generated by the oil residue screening machine and the waste gas from the slag discharge device.

[0019] The continuous oil sludge bag pretreatment system of the present invention includes a sorting station, a conveyor, a crusher, a discharge device, a feeder, an oil sludge screening machine, a sludge discharge device, an oil discharge device, an oil and gas collection device, and a steam system. It can realize continuous production with high production efficiency and high energy utilization. The steam system is connected to the crusher, the discharge device, the feeder, and the oil sludge screening machine respectively, and fully preheats the material before it enters the oil sludge screening machine, ensuring smooth material transportation and making the operating parameters of the oil sludge screening machine more constant. Only a few stations, such as the sorting station, require manual intervention, while other stations can be automated, resulting in a high degree of automation.

[0020] As an improvement, the unloading device includes a first unloading assembly located below the crusher and a second unloading assembly located below the first unloading assembly. The first unloading assembly includes a first unloading box and a first unloading gate, and the second unloading assembly includes a second unloading box and a second unloading gate. The first unloading box is sealed to the crusher, and the first unloading box and the second unloading box are sealed to each other. A steam system is connected to the first unloading box and the second unloading box.

[0021] As an improvement, the feeder adopts a shaftless screw feeder;

[0022] The feeder uses a hydraulic push rod feeder.

[0023] As an improvement, the steam system includes a steam jacket surrounding the feeder, where steam in the steam jacket heats the sludge in the feeder to facilitate material transport. The outlets of the feeder and the steam jacket are located in the oil residue screening machine, where steam from the steam jacket heats the sludge entering the oil residue screening machine a second time. The steam system also includes a steam atomizing spray gun located at the feeder outlet, which heats the sludge a third time, causing it to dissolve and fall into the filter cartridge.

[0024] As an improvement, saturated steam is introduced into the steam jacket at a temperature of 185°C and a pressure of 1.0 MPa.

[0025] As an improvement, the oil residue screening machine includes:

[0026] outer cylinder;

[0027] Insulated outer shell, covering the outer cylinder;

[0028] The filter cartridge is fixed inside the outer cylinder;

[0029] The drive unit drives the outer cylinder to rotate;

[0030] Spiral baffles are installed in the filter cartridge and extend from the feed end to the discharge end;

[0031] The feed end cover is fixedly installed and dynamically sealed with the outer cylinder. It is equipped with a feed inlet and a steam inlet.

[0032] The discharge end cover is fixedly installed and dynamically sealed with the outer cylinder. It is equipped with an oil outlet, a slag outlet, and an exhaust outlet.

[0033] As an improvement, the oil residue screening machine includes:

[0034] outer cylinder;

[0035] Insulated outer shell, covering the outer cylinder;

[0036] The filter cartridge is fixed inside the outer cylinder;

[0037] The drive unit drives the outer cylinder to rotate;

[0038] Multiple annular weir plates are set in the filter cylinder, evenly distributed from the feed end to the discharge end, and have interruptions;

[0039] The feed end cover is fixedly installed and dynamically sealed with the outer cylinder. It is equipped with a feed inlet and a steam inlet.

[0040] The discharge end cover is fixedly installed and dynamically sealed with the outer cylinder. It is equipped with an oil outlet, a slag outlet, and an exhaust outlet.

[0041] As an improvement, the filter cartridge has an inclination angle of 1 to 3° and the feed end is higher than the discharge end;

[0042] As an improvement, fish scale seals are used between the feed end cover, the discharge end cover, and the outer cylinder.

[0043] As an improvement, the internal temperature of the filter cartridge is controlled by a steam heating regulating valve to keep the material within the normal operating temperature range. The internal pressure of the filter cartridge is controlled by a tail exhaust valve to ensure that the internal pressure of the filter cartridge is kept at a slightly negative pressure to prevent exhaust gas from overflowing and polluting the surrounding environment. The slightly negative pressure is -10 to 0 Pa.

[0044] As an improvement, the slag discharge device includes a first slag discharge assembly located below the slag discharge port of the oil slag screening machine, a second slag discharge assembly located below the first slag discharge assembly, and a slag box located below the second slag discharge assembly. The first slag discharge assembly includes a first slag discharge box and a first slag discharge valve. The second slag discharge assembly includes a second slag discharge box and a second slag discharge valve. The first slag discharge box is sealed to the crusher. The first slag discharge box and the second slag discharge box are sealed to each other. The steam system is connected to the first slag discharge box and the second slag discharge box.

[0045] The oil and gas collection device includes an induced draft fan, a cooler, an oil-water separator, a deodorization device, an oil residue screening machine, and a second slag discharge box of the slag discharge device connected to the cooler. A portion of the oil separated by the oil-water separator is sent to the oil washing system as an oil washing extractant.

[0046] The oil discharge device includes an oil sludge transfer pump.

[0047] A continuous sludge bag pretreatment process is applied to the aforementioned continuous sludge bag pretreatment system, the continuous sludge bag pretreatment process comprising:

[0048] Step S1: Oil package sorting;

[0049] Step S2: The sorted sludge is transported to the crusher;

[0050] Step S3: Steam is introduced into the crusher, and the crusher performs crushing.

[0051] Step S4: The crushed material is quantitatively fed into the feeder;

[0052] Step S5: The feeder sends the material into the oil sludge screening machine. The material in the feeder is heated once by the steam jacket, the material coming out of the feeder is heated a second time by the steam jacket, and the material is heated a third time by the steam atomizing spray gun, so that the oil sludge is dissolved and falls into the filter cartridge.

[0053] Step S6: The oil sludge screening machine separates the oil sludge from the oil sludge. The steam heating regulating valve keeps the temperature inside the filter cartridge constant, and the tail exhaust valve controls the pressure inside the filter cartridge to keep it slightly negative. Oil sludge with a diameter of less than 2mm flows through the screen holes and is collected at the bottom of the filter cartridge.

[0054] Step S7: Treat the generated waste gas; transport the oil sludge obtained from the oil residue screening machine to the storage tank; collect the coarse slag generated by the oil residue screening machine.

[0055] The continuous sludge bag pretreatment system and process of the present invention have the following advantages: they can achieve continuous production, with high production efficiency and high energy utilization; only a few stations such as the sorting station require manual intervention, while other stations can be automated, resulting in a high degree of automation. Attached Figure Description

[0056] Figure 1 is a schematic diagram of the continuous sludge bag pretreatment system according to Embodiment 1 of the present invention.

[0057] Figure 2 is a schematic diagram of the continuous sludge bag pretreatment system according to Embodiment 2 of the present invention.

[0058] Figure 3 is a structural block diagram of the continuous sludge bag pretreatment system according to an embodiment of the present invention. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be explained and described below. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0060] Example 1

[0061] Referring to Figures 1 and 3, a continuous sludge bag pretreatment system according to Embodiment 1 of the present invention includes:

[0062] Sorting station;

[0063] Conveyor;

[0064] Crusher;

[0065] Unloading device;

[0066] Feeder;

[0067] Oil residue screening machine;

[0068] Slag discharge device;

[0069] Oil outlet device;

[0070] Oil and gas collection devices;

[0071] The steam system is connected to the crusher, unloading device, feeder, and oil residue screening machine respectively;

[0072] The system includes a sorting station for sorting sludge bags; a conveyor for delivering the sorted sludge bags to a crusher; a crusher for crushing the sludge bags; a discharge device for quantitatively dropping the crushed material into a feeder; a feeder for feeding the material into an oil residue screening machine; an oil residue screening machine for separating coarse residue and sludge slurry during the rotating conveying process; a slag discharge device for collecting the separated coarse residue; an oil discharge device for collecting the separated sludge slurry and sending it to a storage tank; and an oil and gas collection device for collecting the waste gas generated by the oil residue screening machine and the waste gas from the slag discharge device.

[0073] In this embodiment, the unloading device includes a first unloading assembly located below the crusher and a second unloading assembly located below the first unloading assembly. The first unloading assembly includes a first unloading box and a first unloading gate. The second unloading assembly includes a second unloading box and a second unloading gate. The first unloading box is sealed to the crusher. The first unloading box and the second unloading box are sealed to each other. The steam system is connected to the first unloading box and the second unloading box.

[0074] In this embodiment, the feeder is a shaftless screw feeder.

[0075] In this embodiment, the steam system includes a steam jacket surrounding the feeder. The steam in the steam jacket heats the sludge in the feeder once to facilitate material conveying. The outlets of the feeder and the steam jacket are located in the oil residue screening machine. The steam from the steam jacket heats the sludge entering the oil residue screening machine a second time. The steam system also includes a steam atomizing spray gun located at the feeder outlet. The steam atomizing spray gun heats the sludge a third time, causing the sludge to dissolve and fall into the filter cartridge.

[0076] In this embodiment, saturated steam is introduced into the steam jacket. The temperature of the saturated steam is 185°C and the pressure is 1.0 MPa.

[0077] In this embodiment, the oil residue screening machine includes:

[0078] outer cylinder;

[0079] Insulated outer shell, covering the outer cylinder;

[0080] The filter cartridge is fixed inside the outer cylinder;

[0081] The drive unit drives the outer cylinder to rotate;

[0082] Multiple annular weir plates are set in the filter cylinder, evenly distributed from the feed end to the discharge end, and have interruptions;

[0083] The feed end cover is fixedly installed and dynamically sealed with the outer cylinder. It is equipped with a feed inlet and a steam inlet.

[0084] The discharge end cover is fixedly installed and dynamically sealed with the outer cylinder. It is equipped with an oil outlet, a slag outlet, and an exhaust outlet.

[0085] In this embodiment, the filter cartridge is tilted at an angle of 1 to 3° and the feed end is higher than the discharge end.

[0086] In this embodiment, the feed end cap, the discharge end cap, and the outer cylinder are sealed with fish scales.

[0087] In this embodiment, the drive device structure can be referenced from that of a rotary kiln. The dynamic sealing structure between the feed end cover, the discharge end cover, and the outer cylinder can also be referenced from that of a rotary kiln.

[0088] In this embodiment, the internal temperature of the filter cartridge is controlled by a steam heating regulating valve to keep the material within the normal operating temperature range. The internal pressure of the filter cartridge is controlled by a tail exhaust valve to ensure that the internal pressure of the filter cartridge is kept slightly negative to prevent exhaust gas from overflowing and polluting the surrounding environment. The slightly negative pressure is -10 to 0 Pa.

[0089] In this embodiment, the slag discharge device includes a first slag discharge assembly located below the slag discharge port of the oil residue screening machine, a second slag discharge assembly located below the first slag discharge assembly, and a slag box located below the second slag discharge assembly. The first slag discharge assembly includes a first slag discharge box and a first slag discharge valve, and the second slag discharge assembly includes a second slag discharge box and a second slag discharge valve. The first slag discharge box is sealed to the crusher, and the first slag discharge box and the second slag discharge box are sealed to each other. The steam system is connected to the first slag discharge box and the second slag discharge box.

[0090] The oil and gas collection device includes an induced draft fan, a cooler, an oil-water separator, a deodorization device, an oil residue screening machine, and a second slag discharge box of the slag discharge device connected to the cooler. A portion of the oil separated by the oil-water separator is sent to the oil washing system as an oil washing extractant.

[0091] The oil discharge device includes an oil sludge transfer pump.

[0092] Referring to Figure 3, the working process of the continuous sludge pretreatment system of the present invention is as follows:

[0093] 1) The sludge bags from the temporary storage warehouse are placed in the prefabrication area of ​​the pretreatment workshop by forklift. The 5T overhead crane in the workshop lifts the sludge bags into the sludge bag sorting box. The bottom of the sludge bags is cut open by hand with a knife, and the small bags of sludge bags fall into the sorting box. The impurities (iron blocks, wood, stones, etc.) in each ton bag are sorted out by hand.

[0094] 2) For qualified oil sludge bags, the small bags are manually hooked onto the moving chain plate of the chain conveyor, and the oil sludge bag material is transferred to the feed hopper of the crusher.

[0095] 3) The material falls into the cutter box of the crusher. The crusher crushes the oil sludge bag. The particle size of the crushed material is 3-5cm. When the material falling into the first-stage gate reaches a certain amount, the first-stage gate opens and the material falls into the second-stage gate. After the first-stage gate closes, the second-stage gate opens and the material falls into the feed hopper of the shaftless screw feeder. One cycle is completed. The main functions of the crusher, the first-stage gate, and the second-stage gate to introduce steam are as follows: (1) It is easy to catch fire during the crushing process. Steam can be used to extinguish the fire; (2) It heats and washes the residual material in the sliding track of the first and second-stage gates to prevent it from affecting the limit of the gate opening and closing; (3) It preheats the crushed material to increase the initial fluidity. The unloading device unloads the material at regular intervals and in quantitative quantities according to the processing capacity of the oil sludge screening machine.

[0096] 4) The shaftless screw conveyor, controlled by motor frequency, uniformly transports materials into the oil residue screening machine. The rear end of the conveyor is a material sealing zone, where the front screw delivers materials. During the continuous conveying process, the front screw pushes the material into the oil residue screening machine. The shaftless screw conveyor feeds materials at regular intervals and in measured quantities according to the processing capacity of the oil residue screening machine.

[0097] 5) The coarse oil sludge is first heated by the jacket steam in the screw feeder. Saturated steam (temperature: 185℃, pressure: 1.0MPa) is introduced into the steam jacket of the conveyor to heat the internal material, reduce the material density and enhance its fluidity to facilitate material conveying. In the oil residue screening machine, the coarse oil sludge is heated and dissolved a second and third time by the jacket steam from the screw conveyor and the separately set steam atomizing spray gun. After the coarse oil sludge is completely dissolved through heat and mass transfer through the above three steam heating, it falls into the oil residue screening machine for solid-liquid separation.

[0098] 6) The oil sludge screening machine is a rotating filter cylinder that rotates in both directions. It uses a two-point support structure with rollers and a rolling ring to support the filter cylinder, with an inclination angle of 1–3°. The inner wall of the filter cylinder has several evenly distributed filter holes (1–2 mm). The upper part of the filter screen contains coarse oil sludge, and the lower part contains the separated oil slurry solution. Spiral baffles are installed inside the filter cylinder to ensure uniform mixing and heating of the materials, and to extend the residence time of the materials within the filter cylinder for thorough separation. The rotation speed of the filter cylinder is adjusted according to process requirements. The coarse oil sludge is directly heated by saturated steam inside the filter cylinder. Under the action of gravity and the internal structure, the material moves from the feed end to the discharge end, where solid-liquid separation occurs on the upper part of the filter screen. The frequency of sludge discharge and the separation effect are controlled by the rotation frequency of the filter cylinder, effectively controlling the oil yield and oil content of the sludge. The oil residue screening machine operates in a continuous, sealed, and slightly negative pressure mode. The temperature is between 80 and 100℃, and the pressure is approximately -10 to 0 Pa. The internal pressure and temperature of the filter cartridge are controlled by the exhaust gas outlet valve and the steam heating inlet valve to prevent the internal temperature of the filter cartridge from becoming too high and to prevent exhaust gas from overflowing and polluting the environment.

[0099] 7) After being filtered by the filter screen, the oil sludge flows to the bottom of the filter cartridge and is then pumped to the raw material tank area for storage and homogenization. The separated coarse slag is discharged through the slag discharge system at the tail end of the oil slag screening machine. The slag discharge is controlled uniformly by the first and second stage hydraulic discharge valves of the slag discharge assembly, ensuring that the internal pressure and temperature are not affected by the slag discharge and ensuring continuous and stable operation of the system. The exhaust gas generated during the production process of the oil slag screening machine is drawn in by an induced draft fan and first enters the cooler to separate the condensate and non-condensable gas. The condensate enters the oil-water separator, and the separated and recovered oil is sent to the oil washing system as an oil washing extractant through a gear oil pump. The separated wastewater meets the discharge standards. The non-condensable gas enters the deodorization system and is treated by processes such as alkaline absorption and activated carbon adsorption before meeting the discharge standards or entering the incineration system for combustion.

[0100] The continuous oil sludge bag pretreatment system of the present invention includes a sorting station, a conveyor, a crusher, a discharge device, a feeder, an oil sludge screening machine, a sludge discharge device, an oil discharge device, an oil and gas collection device, and a steam system. It can realize continuous production with high production efficiency and high energy utilization. The steam system is connected to the crusher, the discharge device, the feeder, and the oil sludge screening machine respectively, and fully preheats the material before it enters the oil sludge screening machine, ensuring smooth material transportation and making the operating parameters of the oil sludge screening machine more constant. Only a few stations, such as the sorting station, require manual intervention, while other stations can be automated, resulting in a high degree of automation.

[0101] Example 2

[0102] The difference between Example 2 and Example 1 lies in the feeder and the oil residue screening machine.

[0103] Referring to Figures 2 and 3, in this embodiment, the crushed material is conveyed to the oil residue screening machine via a hydraulic pusher feeder. The hydraulic pusher feeder consists of two parts: a push rod and a push bar. Hydraulic oil pushes the push bar forward and backward within the push bar, and a limit switch controls the push bar's movement distance, pushing the material into the oil residue screening machine stage by stage. The rear section of the hydraulic push bar is a material sealing section to prevent exhaust gas from escaping and heat loss from inside the screening machine. Saturated steam (temperature: 185℃, pressure: 1.0MPa) is introduced into the steam jacket of the hydraulic pusher cylinder to heat the internal material, reducing its viscosity and enhancing its fluidity.

[0104] In this embodiment, the oil sludge screening machine with an annular weir plate structure is basically the same as that with a spiral baffle structure. The difference is that each annular weir plate is discontinuous rather than continuous, and they are arranged evenly from the feed end to the discharge end. The working principle of the oil sludge screening machine with an annular weir plate structure is as follows: as the filter cylinder rotates, the material moves from the beginning of the first annular weir plate to the end. After the end, it falls onto the second annular weir plate by gravity, and so on. As the material falls, the contact area increases, the heating is more complete, and the oil sludge separation effect is better.

[0105] This invention also provides a continuous sludge bag pretreatment process, applied to the aforementioned continuous sludge bag pretreatment system, wherein the continuous sludge bag pretreatment process includes:

[0106] Step S1: Oil package sorting;

[0107] Step S2: The sorted sludge is transported to the crusher;

[0108] Step S3: Steam is introduced into the crusher, and the crusher performs crushing.

[0109] Step S4: The crushed material is quantitatively fed into the feeder;

[0110] Step S5: The feeder sends the material into the oil sludge screening machine. The material in the feeder is heated once by the steam jacket, the material coming out of the feeder is heated a second time by the steam jacket, and the material is heated a third time by the steam atomizing spray gun, so that the oil sludge is dissolved and falls into the filter cartridge.

[0111] Step S6: The oil sludge screening machine separates the oil sludge from the oil sludge. The steam heating regulating valve keeps the temperature inside the filter cartridge constant, and the tail exhaust valve controls the pressure inside the filter cartridge to keep it slightly negative. Oil sludge with a diameter of less than 2mm flows through the screen holes and is collected at the bottom of the filter cartridge.

[0112] Step S7: Treat the generated waste gas; transport the oil sludge obtained from the oil residue screening machine to the storage tank; collect the coarse slag generated by the oil residue screening machine.

[0113] The advantages of the continuous sludge bag pretreatment process of the present invention are: it enables continuous production with high production efficiency and high energy utilization; it fully preheats the material before it enters the sludge screening machine, ensuring smooth material conveying while making the working parameters of the sludge screening machine more constant; only a few stations such as the sorting station require manual intervention, while other stations can be automated, resulting in a high degree of automation.

[0114] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A continuous sludge bag pretreatment process, applied to a continuous sludge bag pretreatment system, characterized in that: The continuous oil sludge pretreatment process includes: Step S1, oil bag sorting; Step S2, conveying the sorted oil sludge to a crusher; Step S3, introducing steam into the crusher for crushing; Step S4, quantitatively feeding the crushed material into a feeder; Step S5, the feeder feeds the material into an oil residue screening machine, where the material in the feeder is heated once by a steam jacket, the material exiting the feeder is heated a second time by a steam jacket, and the material is heated a third time by a steam atomizing spray gun, causing the oil sludge to dissolve and fall into the filter cartridge; Step S6, oil residue screening... The filter cartridge is separated from the oil sludge using a steam heating regulating valve to maintain a constant temperature inside. A tail-end exhaust valve controls the pressure inside the filter cartridge to maintain a slight negative pressure. Oil sludge with a diameter less than 2mm flows through the screen holes and is collected at the bottom of the filter cartridge. Step S7: Treat the generated exhaust gas. The oil sludge obtained from the oil sludge screening machine is transported to a storage tank. Coarse sludge produced by the oil sludge screening machine is collected. The continuous oil sludge pretreatment system includes: a sorting station; a conveyor; a crusher; a discharge device; a feeder; an oil sludge screening machine; and a steam system connected to the crusher and discharge device. The system includes a feeder, an oil sludge screening machine, a sludge discharge device, an oil discharge device, and an oil and gas collection device. The sorting station is used to sort oil sludge bags; a conveyor is used to deliver the sorted oil sludge bags to a crusher; the crusher is used to crush the oil sludge bags; a discharge device is used to quantitatively drop the crushed material into the feeder; the feeder is used to deliver the material into the oil sludge screening machine; the oil sludge screening machine is used to separate coarse sludge and oil slurry during the rotating conveying process; the sludge discharge device is used to collect the separated coarse sludge; and the oil discharge device is used to collect the separated oil slurry and deliver it to a storage tank. The oil and gas collection device is used to collect the waste gas generated by the oil residue screening machine and the waste gas in the slag discharge device. The oil residue screening machine includes: an outer cylinder; an insulated shell that covers the outer cylinder; a filter cylinder that is fixed in the outer cylinder; a drive device that drives the outer cylinder to rotate; a spiral baffle that is located in the filter cylinder and extends from the feed end to the discharge end; or, multiple annular weir plates that are located in the filter cylinder and are evenly distributed from the feed end to the discharge end, with a break; a feed end cover that is fixedly installed and dynamically sealed with the outer cylinder, and has a feed port and a steam inlet; and a discharge end cover that is fixedly installed and dynamically sealed with the outer cylinder, and has an oil outlet, a slag outlet, and an exhaust port.

2. The continuous sludge pretreatment process according to claim 1, characterized in that: The unloading device includes a first unloading assembly located below the crusher and a second unloading assembly located below the first unloading assembly. The first unloading assembly includes a first unloading box and a first unloading gate. The second unloading assembly includes a second unloading box and a second unloading gate. The first unloading box is sealed to the crusher. The first unloading box and the second unloading box are sealed to each other. A steam system is connected to the first unloading box and the second unloading box.

3. The continuous sludge pretreatment process according to claim 1, characterized in that: The feeder is a shaftless screw feeder, or a hydraulic push rod feeder.

4. The continuous sludge pretreatment process according to claim 1, characterized in that: The steam system includes a steam jacket surrounding the feeder, where steam in the steam jacket heats the sludge in the feeder in a primary manner. The outlets of the feeder and the steam jacket are located in the oil residue screening machine, where steam from the steam jacket heats the sludge entering the oil residue screening machine in a secondary manner. The steam system also includes a steam atomizing spray gun located at the feeder outlet, which heats the sludge in a tertiary manner. Saturated steam is introduced into the steam jacket.

5. The continuous sludge pretreatment process according to claim 1, characterized in that: The filter cartridge has an inclination angle of 1 to 3 degrees and the feed end is higher than the discharge end; the feed end cover, discharge end cover and outer cylinder are sealed with fish scales.

6. The continuous sludge pretreatment process according to claim 1, characterized in that: The steam system also includes a steam heating regulating valve, which controls the internal temperature of the filter cartridge to keep the material within the normal operating temperature range. The oil and gas collection device also includes a tail exhaust valve, which controls the internal pressure of the filter cartridge to ensure that the internal pressure of the filter cartridge is kept slightly negative to prevent exhaust gas from overflowing and polluting the surrounding environment. The slightly negative pressure is -10 to 0 Pa.

7. The continuous sludge pretreatment process according to claim 1, characterized in that: The slag discharge device includes a first slag discharge assembly located below the slag discharge port of the oil slag screening machine, a second slag discharge assembly located below the first slag discharge assembly, and a slag box located below the second slag discharge assembly. The first slag discharge assembly includes a first slag box and a first slag discharge valve. The second slag discharge assembly includes a second slag box and a second slag discharge valve. The first slag box is sealed to the crusher, and the first and second slag boxes are sealed to each other. A steam system is connected to the first and second slag boxes. The oil and gas collection device includes an induced draft fan, a cooler, an oil-water separator, and a deodorization device. The second slag box of the oil slag screening machine and the slag discharge device is connected to the cooler. A portion of the oil separated by the oil-water separator is sent to the oil washing system as an oil washing extractant. The oil discharge device includes an oil sludge conveying pump.

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