Drying device for drying sludge by using waste oil

Abstract

The utility model provides a drying device for drying sludge by using waste oil, which relates to the technical field of sludge treatment devices and comprises a wet sludge conveyor inserted into a frying and drying tank, a molding plate is welded at a discharge port of the wet sludge conveyor, a round hole is formed in the surface of the molding plate and communicated with a connecting pipe, and the diameter of the connecting pipe is the same as that of the round hole. The end, deviating from the molding plate, of the connecting pipe is connected with a feeding port of a drying screw conveyor, and the drying screw conveyor penetrates out of a discharging port of the frying and drying tank and is arranged above the dry sludge bin; the technical problems that in the prior art, the drying period is long, cooperative treatment with waste oil is not achieved, and resources are wasted are solved, and the technical effects that energy consumption is reduced, drying time is shortened, sludge and waste oil are synchronously treated, and resources are cooperatively utilized are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sludge treatment device technical field especially is with a kind of drying device for drying sludge using waste oil. BACKGROUND

[0002] Municipal sludge moisture content is usually as high as 70%~90%, resulting in high sludge transportation cost and great subsequent treatment difficulty, so it is necessary to reduce moisture content. At the same time, kitchen waste oil as another kind of organic waste, if directly incinerated or landfilled, not only wastes high calorific value of about 4000kcal / kg~5000kcal / kg, but also produces pollutants due to incomplete combustion.

[0003] At present, sludge moisture reduction drying equipment is two kinds: heat convection (high-temperature air drying) and heat conduction (steam heating disc drying); Among them, high-temperature air drying is that sludge is formed by slitting machine, uniformly laid on the mesh belt of drying box; Heat pump system heats air and blows from the bottom of mesh belt, sludge absorbs heat and evaporates water, wet hot air is cooled and condensed by evaporator, water is discharged, latent heat is recycled by heat pump, forming closed energy cycle. And disc drying, after sludge is sent into the gap between the shell and the disc, the heat medium is heated by the disc surface, the paddle pushes the sludge to move to the discharge port and stirs when the disc rotates at low speed, so that it fully contacts with the hot surface to evaporate water.

[0004] But the two kinds of sludge drying equipment in prior art, both need to be carried out under high temperature condition, energy consumption is extremely high, drying time is as long as 40~60 minutes, and with the hardening of sludge surface, heat transfer efficiency is further reduced, resulting in drying cycle extension. In addition, municipal sludge drying and waste oil treatment are usually carried out independently, which cannot utilize the calorific value of waste oil to improve drying efficiency, and cannot realize the simultaneous treatment of the two kinds of waste resources. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of drying device for drying sludge using waste oil, to alleviate the technical problems of long drying cycle and not being treated with waste oil in prior art, waste resources.

[0006] The utility model provides a kind of drying device for drying sludge using waste oil, including: wet sludge conveyor, frying drying tank, plastic forming plate, connecting pipe, drying screw conveyor and condensation separation component;

[0007] The wet sludge conveyor is inserted into the inside of the frying drying tank, the discharge port of the wet sludge conveyor is welded with a plastic plate, the surface of the plastic plate is provided with a round hole, the round hole is communicated with a connecting pipe, the connecting pipe is the same in diameter with the round hole, one end of the connecting pipe, which is away from the plastic plate, is connected with the feeding port of the drying screw conveyor, and the drying screw conveyor is arranged above the dry sludge bin and passes out of the discharge port of the frying drying tank; and the frying drying tank is communicated with a condensation separation assembly for recycling waste oil.

[0008] Further, the diameter of the connecting pipe and the round hole is 10mm-15mm.

[0009] Further, the condensation separation assembly comprises a condenser and an oil-water separator arranged in sequence along the flow direction; the water outlet of the oil-water separator is communicated with a waste water tank, the oil outlet of the oil-water separator is communicated with an oil tank, and the top end of the oil tank is communicated with a waste oil collecting barrel.

[0010] The condenser is communicated with the oil outlet of the upper part of the frying drying tank, and the output end of the oil tank is communicated with the oil inlet of the frying drying tank.

[0011] Further, a centrifugal pump is arranged on the pipeline, which is communicated with the condenser and the oil outlet of the upper part of the frying drying tank, and the centrifugal pump is used for extracting waste oil circulation.

[0012] Further, the waste oil collecting barrel is filled with kitchen waste oil, trench oil, industrial lubricating oil or waste vegetable oil.

[0013] Further, the inclination angle between the wet sludge conveyor and the drying screw conveyor and the horizontal line of the ground is 20°-45°.

[0014] Further, the frying temperature of the frying drying tank is 120℃-170℃, and the residence time of the sludge in the drying screw conveyor is 8min-15min.

[0015] Further, the feeding port of the wet sludge conveyor is communicated with a calcium oxide pipeline or a ferric chloride pipeline.

[0016] Beneficial effects:

[0017] The utility model provides a kind of dry device for waste oil dry sludge, comprising: wet sludge conveyor is inserted into the inside of the frying drying tank, the discharge port of the wet sludge conveyor is welded with a plastic plate, the surface of the plastic plate is provided with a round hole, the round hole is communicated with a connecting pipe, the connecting pipe is the same in diameter with the round hole, one end of the connecting pipe, which is away from the plastic plate, is connected with the feeding port of the drying screw conveyor, and the drying screw conveyor is arranged above the dry sludge bin and passes out of the discharge port of the frying drying tank;And the frying drying tank is communicated with a condensation separation assembly for recycling waste oil.

[0018] By setting plastic plate, sludge is extruded and formed into cylindrical shape and then dropped into drying screw conveyor through connecting pipe, and sludge is more regular in shape during frying and drying process, so that the contact efficiency of sludge and oil can be improved.

[0019] Using waste oil as a heat source for sludge drying leverages its high calorific value. Through frying, the calorific value of the dried sludge is significantly increased. Compared to traditional heat convection and heat conduction drying methods, frying offers higher heat transfer efficiency. The waste oil ensures thorough contact with the sludge, causing rapid heating and quick evaporation of moisture, greatly shortening drying time and improving production efficiency. Furthermore, the screw conveyor can control the sludge residence time, preventing surface hardening.

[0020] Furthermore, this invention can recycle waste oil after frying by incorporating a condensation separation component. During the drying process, the waste oil, after being used multiple times, can be recycled through condensation separation and reused for sludge drying, reducing the cost of waste oil usage and minimizing the environmental impact of waste oil emissions. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the structure of a drying device for drying sludge using waste oil, provided in an embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the wet sludge conveyor in the drying device for drying sludge using waste oil, provided in an embodiment of this utility model.

[0024] Icons: 1 - Wet sludge conveyor; 2 - Frying and drying tank; 3 - Plastic plate; 301 - Round hole; 4 - Connecting pipe; 5 - Drying screw conveyor; 6 - Condensation and separation assembly; 601 - Condenser; 602 - Oil-water separator; 603 - Wastewater tank; 604 - Oil tank; 605 - Waste oil collection bucket; 606 - Centrifugal pump. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] Example 1

[0033] like Figure 1 , Figure 2As shown, the present invention provides a drying device for drying sludge using waste oil, comprising: a wet sludge conveyor 1, a deep-frying drying tank 2, a plastic molding plate 3, a connecting pipe 4, a drying screw conveyor 5, and a condensation separation component 6.

[0034] The wet sludge conveyor 1 is inserted into the frying and drying tank 2. A plastic plate 3 is welded to the outlet of the wet sludge conveyor 1. A round hole 301 is opened on the surface of the plastic plate 3. The round hole 301 is connected to a connecting pipe 4. The diameter of the connecting pipe 4 is the same as that of the round hole 301. The end of the connecting pipe 4 away from the plastic plate 3 is connected to the inlet of the drying screw conveyor 5. The drying screw conveyor 5 passes through the outlet of the frying and drying tank 2 and is arranged above the dry sludge silo. The frying and drying tank 2 is connected to the condensation and separation component 6 for recycling waste oil.

[0035] Specifically, such as Figure 2 As shown, the wet sludge conveyor 1 is a screw conveyor tilted upwards to the left, receiving sludge with an external moisture content of 80%. The wet sludge conveyor includes a support to maintain the tilt, a motor to provide power, rotating wheels and blades for transporting materials, a housing, and inlet and outlet ports. The function of the wet sludge conveyor 1 is to transport the wet sludge to be processed to the drying screw conveyor 5 in the frying drying tank 2. The connection between the frying drying tank 2 and the wet sludge conveyor 1 can be achieved in two ways: one is to create a through hole in it, sealing the wet sludge conveyor 1 so that part of it is inserted into the tank; the other is to use a one-piece molding method. Correspondingly, the connection and fixing method between the drying screw conveyor 5 on the other side of the tank and the frying drying tank 2 is the same as that between the frying drying tank 2 and the wet sludge conveyor 1. The insertion method ensures that the wet sludge can enter directly and smoothly, avoiding potential leakage or blockage problems during transportation.

[0036] A molding plate 3 is welded to the discharge port of the wet sludge conveyor 1. The molding plate 3 serves a shaping function, shaping the wet sludge conveyed from the wet sludge conveyor 1. A circular hole 301 is evenly distributed on the surface of the molding plate. When the wet sludge reaches the molding plate 3 through the discharge port, it is squeezed through the circular hole 301, thus forming a cylindrical shape. This allows the wet sludge to contact the waste oil more evenly during the subsequent drying process in the drying screw conveyor 5, improving drying efficiency. The circular hole 301 is connected to a connecting pipe 4, and the diameter of the connecting pipe 4 is the same as the diameter of the circular hole 301. The shaped wet sludge enters the connecting pipe 4 through the circular hole 301, and is then smoothly conveyed to the drying screw conveyor 5. The end of the connecting pipe 4 facing away from the molding plate 3 is accurately connected to the inlet of the drying screw conveyor 5. A portion of the casing of the drying screw conveyor 5 is immersed in hot oil for drying.

[0037] It should be noted that the structural difference between the drying screw conveyor 5 and the wet sludge conveyor 1 lies in the density of the spiral blades on the drying screw conveyor 5. Unlike the wet sludge conveyor 1, which only performs a transport function, the drying screw conveyor 5 utilizes its spiral structure to slowly transport the wet sludge. During transport, the wet sludge comes into full contact with the high-temperature waste oil in the frying and drying tank 2. The high calorific value of the waste oil causes the moisture in the wet sludge to evaporate rapidly, thus achieving sludge drying. Therefore, the distance between adjacent spiral blades is smaller, increasing the heating surface area. Furthermore, the motor of the drying screw conveyor 5 is located at the extension of the frying and drying tank 2. By adjusting the rotation speed of the drying screw conveyor 5, the residence time of the sludge in the frying and drying tank 2 is maintained at 8 to 15 minutes. The discharge port of the drying screw conveyor 5, extending out of the frying and drying tank 2, is positioned above the dry sludge silo. After the sludge has been dried in the drying screw conveyor 5, it falls directly from the discharge port into the dry sludge silo for storage.

[0038] The frying and drying tank 2 is connected to the condensation and separation component 6. During the sludge drying process, the waste oil continuously absorbs moisture from the wet sludge, while also generating some steam and impurities. The condensation and separation component 6 condenses this steam, separating the moisture, and simultaneously filters and separates the impurities from the waste oil. The waste oil treated by the condensation and separation component 6 can be recycled back into the frying and drying tank 2, achieving efficient recovery and reuse of waste oil and reducing the operating costs of the equipment.

[0039] It should be noted that the heating method for the frying and drying tank 2 can be an electric heating coil laid at the bottom, a gas burner, microwave auxiliary heating, or solar heating, so that the oil temperature inside the frying and drying tank 2 is between 120℃ and 170℃ during operation. The frying and drying tank 2 can quickly evaporate moisture, and waste oil permeates and replaces the moisture, reducing the moisture content to less than 5% in 10 minutes;

[0040] The synergistic effect of the wet sludge conveyor 1, the molding plate 3, the connecting pipe 4, and the drying screw conveyor 5 in this invention ensures that the wet sludge comes into uniform contact with the high-temperature waste oil, greatly improving drying efficiency. Compared to traditional drying methods, the drying time is significantly shortened, and the moisture content of the dried sludge is significantly reduced, better meeting the needs of subsequent treatment and utilization. The interconnected design of the frying drying tank 2 and the condensation separation component 6 enables the recovery and recycling of waste oil. This not only reduces waste oil emissions and environmental pollution but also saves energy and resources.

[0041] Example 2

[0042] In an embodiment of this utility model, the condensation separation component 6 includes a condenser 601 and an oil-water separator 602 arranged sequentially along the flow direction; the water outlet of the oil-water separator 602 is connected to a wastewater tank 603, the oil outlet of the oil-water separator 602 is connected to an oil tank 604, and the top of the oil tank 604 is connected to a waste oil collection bucket 605.

[0043] The condenser 601 is connected to the oil outlet at the top of the frying and drying tank 2, and the output end of the oil tank 604 is connected to the oil inlet of the frying and drying tank 2.

[0044] A centrifugal pump 606 is also installed on the pipeline connecting the condenser 601 and the oil outlet at the top of the frying and drying tank 2. The centrifugal pump 606 is used to extract waste oil for circulation.

[0045] Waste oil collection bin 605 is filled with kitchen waste oil, gutter oil, industrial lubricating oil or waste vegetable oil.

[0046] Specifically, the condenser 601 in the condensation separation assembly 6 is connected to the oil outlet of the frying and drying tank 2 via a pipe. When the sludge is dried in the frying and drying tank 2, the waste oil absorbs a large amount of water from the sludge, forming a mixed fluid containing water vapor and impurities. This mixed fluid flows out from the oil outlet at the top of the frying and drying tank 2 and enters the pipe connected to the condenser 601. A centrifugal pump 606 is installed on the pipe. The centrifugal pump 606 draws the waste oil from the frying and drying tank 2, allowing it to flow smoothly to the condenser 601 and preventing localized overheating.

[0047] When waste oil enters condenser 601, condenser 601 is equipped with a multi-stage condenser (condensing water vapor at 0℃ and capturing VOCs at -20℃). The condensate passes through oil-water separator 602, recovering the waste oil to oil tank 604. Oil tank 604 is connected to a gas burner for complete decomposition of VOCs and other organic matter. Oil-water separator 602 has two outlets: a water outlet at the bottom and an oil outlet at the top. The separated water flows through the water outlet into a connected wastewater tank 603 for temporary storage. The separated waste oil flows through the oil outlet into oil tank 604 for recycling.

[0048] Oil tank 604 is connected to waste oil collection tank 605, which is filled with waste oil. When the waste oil level in oil tank 604 is low, waste oil collection tank 605 can be replenished in a timely manner to ensure the continuous and stable operation of the device. At the same time, the output end of oil tank 604 is connected to the oil inlet of frying and drying tank 2 through a pipeline. After separation and replenishment, the waste oil can be recycled back to frying and drying tank 2 for continued use in sludge drying treatment.

[0049] It should be noted that the waste oil in the waste oil collection tank 605 is not limited to kitchen waste oil. It can also use gutter oil, industrial lubricating oil, and waste vegetable oil as heat transfer medium, and the temperature range can be adjusted to match the boiling point of different waste oils.

[0050] Example 3

[0051] In the embodiments of this utility model, the diameter of the connecting tube 4 and the circular hole 301 is 10mm to 15mm.

[0052] The inclination angles between the wet sludge conveyor 1 and the drying screw conveyor 5 and the horizontal line of the ground are both 20° to 45°.

[0053] The frying temperature of the frying drying tank 2 is 120℃~170℃, and the residence time of the sludge in the drying screw conveyor 5 is 8min~15min.

[0054] The feed inlet of the wet sludge conveyor 1 is connected to a calcium oxide pipe or a ferric chloride pipe.

[0055] Specifically, the circular holes 301 on the surface of the connecting pipe 4 and the molding plate 3 are between 10mm and 15mm. When the wet sludge is conveyed to the discharge port by the wet sludge conveyor 1 and reaches the molding plate 3, it will be squeezed through these circular holes 301 and enter the connecting pipe 4. This ensures the fluidity of the wet sludge and the uniformity of the subsequent drying process.

[0056] During installation, both the wet sludge conveyor 1 and the drying screw conveyor 5 are inclined at angles of 20° to 45° relative to the horizontal line of the ground. The wet sludge conveyor 1 is angled upwards and to the left, which allows gravity to assist in the conveying of the wet sludge, making the conveying process smoother and reducing the risk of blockage that may occur due to horizontal conveying. The drying screw conveyor 5 is angled upwards and to the right, which helps the sludge to fully contact the high-temperature waste oil in the frying and drying tank 2 during screw conveying, and also facilitates the smooth discharge of the dried sludge into the dry sludge bin by gravity.

[0057] The frying temperature inside the frying drying tank 2 is between 120℃ and 170℃. The waste oil provides sufficient heat to the wet sludge, causing the moisture in the sludge to evaporate rapidly. Meanwhile, to ensure the drying effect of the sludge, the residence time of the sludge in the drying screw conveyor 5 is 8 to 15 minutes.

[0058] In addition, the feed inlet of the wet sludge conveyor 1 is connected to a calcium oxide pipe or a ferric chloride pipe. Before the wet sludge enters the wet sludge conveyor 1, calcium oxide or ferric chloride can be added to the wet sludge through the calcium oxide pipe or the ferric chloride pipe according to actual needs.

[0059] It should be noted that the feed inlet of the wet sludge conveyor 1 is connected to a calcium oxide pipe or a ferric chloride pipe. It is not limited to adding 5% calcium oxide. The addition ratio or added substances (such as adding 3% ferric chloride, which can also achieve the purpose of destroying the colloidal structure) or the conditioning method can be changed (using an alternating structure of ultrasonic pretreatment and crushing).

[0060] Example 4

[0061] In the embodiments of this utility model, chemical sludge, leather sludge, and electroplating sludge were dried respectively, and the initial moisture content, post-treatment moisture content, and calorific value increase were statistically analyzed. The data are shown in Table 1.

[0062]

[0063] Table 1

[0064] Based on the above embodiments, the working process of the drying device for drying sludge using waste oil provided by this utility model is as follows:

[0065] Wet sludge (initial moisture content approximately 60%-80%) is conveyed by wet sludge conveyor 1. The wet sludge is then fed to the frying and drying tank 2, where it is squeezed through the molding plate 3 at the discharge port, passing through the round holes 301 and connecting pipe 4, and molded into cylindrical sludge strips. These strips fall into the inlet of the drying screw conveyor 5, which is partially immersed in hot oil. Its spiral blades propel the sludge strips. During this process, the high-temperature waste oil comes into full contact with the sludge strips, rapidly evaporating moisture and penetrating to replace the moisture in the sludge. The dried sludge then falls into the dry sludge silo for storage along with the drying screw conveyor 5.

[0066] The waste oil mixture containing water vapor generated during the frying and drying process enters the condenser 601 from the oil outlet at the top of the frying and drying tank 2. After condensation at 0℃ to remove water vapor and VOCs impurities at -20℃, it enters the oil-water separator 602, where the waste oil and water are separated by density difference. The separated water flows into the wastewater tank 603 for centralized treatment, while the waste oil enters the oil tank 604. Finally, the recovered waste oil in the oil tank 604 is returned to the frying and drying tank 2 through a pipeline.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A drying apparatus for drying sludge using waste oil, characterized in that, include: Wet sludge conveyor (1), deep frying drying tank (2), plastic sheet (3), connecting pipe (4), drying screw conveyor (5) and condensation separation assembly (6); The wet sludge conveyor (1) is inserted into the frying drying tank (2). The outlet of the wet sludge conveyor (1) is welded to the plastic plate (3). The surface of the plastic plate (3) is provided with a round hole (301). The round hole (301) is connected to the connecting pipe (4). The diameter of the connecting pipe (4) is the same as that of the round hole (301). The end of the connecting pipe (4) away from the plastic plate (3) is connected to the inlet of the drying screw conveyor (5). The drying screw conveyor (5) is arranged above the dry sludge silo, passing through the outlet of the frying drying tank (2). The frying drying tank (2) is connected to the condensation separation component (6) for recycling waste oil.

2. The drying apparatus for drying sludge using waste oil according to claim 1, characterized in that, The diameter of the connecting pipe (4) and the circular hole (301) is 10mm to 15mm.

3. The drying apparatus for drying sludge using waste oil according to claim 1, characterized in that, The condensation separation assembly (6) includes a condenser (601) and an oil-water separator (602) arranged sequentially along the flow direction; the water outlet of the oil-water separator (602) is connected to a wastewater tank (603), the oil outlet of the oil-water separator (602) is connected to an oil tank (604), and the top of the oil tank (604) is connected to a waste oil collection bucket (605); The condenser (601) is connected to the oil outlet at the top of the frying and drying tank (2), and the output end of the oil tank (604) is connected to the oil inlet of the frying and drying tank (2).

4. The drying apparatus for drying sludge using waste oil according to claim 3, characterized in that, A centrifugal pump (606) is also installed on the pipeline connecting the condenser (601) and the oil outlet at the top of the frying and drying tank (2). The centrifugal pump (606) is used to extract waste oil for circulation.

5. The drying apparatus for drying sludge using waste oil according to claim 3, characterized in that, The waste oil collection tank (605) is filled with kitchen waste oil, gutter oil, industrial lubricating oil or waste vegetable oil.

6. The drying apparatus for drying sludge using waste oil according to claim 1, characterized in that, The inclination angles between the wet sludge conveyor (1) and the drying screw conveyor (5) and the horizontal line of the ground are both 20° to 45°.

7. The drying apparatus for drying sludge using waste oil according to claim 4, characterized in that, The frying temperature of the frying drying tank (2) is 120℃~170℃, and the residence time of the sludge in the drying screw conveyor (5) is 8min~15min.

8. The drying apparatus for drying sludge using waste oil according to claim 1, characterized in that, The feed inlet of the wet sludge conveyor (1) is connected to a calcium oxide pipe or a ferric chloride pipe.

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