Oily sludge feeding equipment

Abstract

The invention discloses oily sludge feeding equipment, which comprises a vibrating screen, which is provided with a screen mesh and is used for screening out impurities in oily sludge, the inner diameter of which is greater than that of meshes in the screen mesh; the oil sludge storage bin is communicated with a feed opening of the vibrating screen so as to store the oil-containing sludge screened by the vibrating screen; a material inlet of the oil sludge solid residue feeding machine is communicated with the oil sludge storage bin, a stirring part is arranged in the oil sludge solid residue feeding machine, the oil sludge solid residue feeding machine is further provided with a solid material outlet and a liquid outlet, and the solid material outlet is provided with a negative pressure pumping device; a feed port of the slag grinding machine is communicated with the solid material outlet, and a discharge port of the slag grinding machine is communicated with a fuel inlet of the combustion boiler; and a flue gas outlet of the combustion boiler is controllably communicated with a flue gas inlet of the oil sludge solid residue adding machine through a flue gas pipeline. According to the oil-containing sludge drying device, equipment blockage is reduced, material leakage and dust overflow are avoided, the water content of the oil-containing sludge is reduced through drying, and the combustion efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of oily sludge transportation, and particularly to an oily sludge dosing device. Background Art

[0002] Oily sludge refers to sludge mixed with heavy oils such as crude oil, various refined oils, and residual oil. It is formed during various activities related to crude oil and refined oil, such as oilfield exploitation, petroleum refining processes, transportation, use, and storage, due to various accidents, improper operations, outdated equipment, damage, corrosion, etc., resulting in the running, overflowing, dripping, and leakage of crude oil and refined oil, which leak to the ground, deposit in the ocean, lakes, and river bottoms, and mix with soil, water, etc. The treatment methods of oily sludge mainly include physical methods, chemical methods, biological methods, and heat treatment methods, etc. Each method has its unique applicable scenarios, advantages, and disadvantages. Oily sludge is not a single liquid phase or solid phase, but a solid and semi-solid composite composed of petroleum hydrocarbons, water, solid particles, and other substances, including petroleum hydrocarbons, water, solid particles, resins, asphaltenes, and toxic and harmful substances such as benzene series, anthracene, phenol, pyrene, etc., and even contains radioactive substances and heavy metals. Therefore, how to safely and reasonably dose oily sludge into disposal facilities has become a problem that needs to be solved currently.

[0003] Currently, most oily sludge is dosed through oil sludge pumps, screw conveyors, scraper conveyors, etc. There are the following deficiencies in dosing through the above-mentioned equipment: First, there is the problem of equipment blockage. There are particulate impurities inside the oily sludge. During normal pipeline transportation, the impurities deposit, resulting in a reduced transportation cross-section. At the same time, the oily sludge has a certain viscosity. When the equipment stops, the oil sludge adheres to components such as pipelines and rotating shafts, and after solidification, it causes the equipment to be blocked and stuck, reducing the transportation and dosing efficiency of the equipment. Second, there are problems of leakage and overflow. Most of the transportation equipment is under positive pressure or normal pressure. As the operation time of the equipment becomes longer, the sealing performance decreases, and leakage and odor emission are likely to occur during transportation. The oil content of the oil sludge is relatively high, and after the oil and gas volatilize, it is easy to cause safety problems. Third, the water content cannot be controlled. The water content of some oily sludge is as high as 80%. When directly mixed with raw coal, it reduces the unit calorific value of the fuel and affects the combustion efficiency after being put into the boiler. Summary of the Invention

[0004] The purpose of the solution of this application is to provide an oily sludge dosing device to reduce equipment blockage, avoid leakage and dust overflow, reduce the water content of oily sludge through drying, and improve the combustion efficiency.

[0005] An oil-containing sludge feeding device provided by the technical solution of the present application includes: a vibrating screen provided with a screen mesh for screening out impurities in the oil-containing sludge that are larger than the inner diameter of the mesh holes of the screen mesh; an oil sludge storage bin connected to the discharge port of the vibrating screen to store the oil-containing sludge screened by the vibrating screen; an oil sludge solid residue feeder, the feeding port of the oil sludge solid residue feeder is connected to the oil sludge storage bin, a stirring part is arranged in the oil sludge solid residue feeder, the oil sludge solid residue feeder is also provided with a solid material outlet and a liquid outlet, and a negative pressure pumping device is arranged at the solid material outlet; a slag grinder, the feeding port of the slag grinder is connected to the solid material outlet, and the discharging port of the slag grinder is connected to the fuel inlet of the combustion boiler; a combustion boiler, a flue gas outlet of the combustion boiler is controllably connected to a flue gas inlet of the oil sludge solid residue feeder through a flue gas pipeline, and the flue gas entering the oil sludge solid residue feeder dries the oil-containing sludge and carries the dried fine particles from the solid material outlet to the feeding port of the slag grinder.

[0006] Optionally, the slag grinder further includes a raw coal feeding port, and the raw coal entering through the raw coal feeding port is mixed with the fine particles located in the slag grinder and then enters the combustion boiler for combustion.

[0007] Optionally, the oil-containing sludge feeding device further includes a control system. A humidity sensor is arranged at the discharge port of the vibrating screen for real-time monitoring of the moisture content of the oil-containing sludge at the discharge port and feedback to the control system; the control system is connected to the driving component of the stirring part for controlling, so as to change the working frequency of the driving component according to the moisture content.

[0008] Optionally, the outer surface of the screen mesh of the vibrating screen is coated with an oil-repellent coating, and a vibrator with adjustable frequency is arranged at the bottom of the vibrating screen. The vibrator vibrates the bottom of the vibrating screen to remove the oil sludge adhered to the outer surface of the screen mesh.

[0009] Optionally, the stirring part includes a rotatably arranged rotating shaft, fan blades located on the rotating shaft, and a heating layer located on the fan blades. The heating layer is connected to the flue gas inlet.

[0010] Optionally, the heating layer is a heat exchange channel arranged outside the fan blades; or the heating layer is a heat flow channel arranged inside the fan blades, and air outlets communicating with the heat flow channel are arranged on the fan blades.

[0011] Optionally, the cavity of the oil sludge solid residue feeder is in a volute shape, the flue gas inlet is located on the side wall of the cavity, the solid material outlet is located at the outlet of the cavity, and the stirring part is located between the flue gas inlet and the solid material outlet.

[0012] Optionally, two crushing rollers are arranged in parallel in the slag grinder, the roller surface spacing between the two crushing rollers is adjustable, a particle size monitor is arranged at the outlet of the slag grinder, and when the particle size of the material is greater than a preset value, the control system triggers an alarm and adjusts the roller surface spacing between the two crushing rollers.

[0013] Optionally, a dust removal device is arranged in the flue gas pipeline. The dust removal device includes a hopper for collecting dust, and the hopper is connected to the feed inlet of the slag grinder through a return pipe.

[0014] Optionally, before entering the oily sludge solid waste feeder, the flue gas pipeline is connected to a waste heat recovery device through a branch pipeline. The waste heat recovery device includes a heat exchanger and a heat storage tank, and the heat recovered by the waste heat recovery device is used to preheat the combustion-supporting air of the combustion boiler or for heating in the factory area.

[0015] Adopting the above technical solutions, the following beneficial effects are achieved:

[0016] The oily sludge feeding device provided by this application introduces the flue gas in the combustion boiler into the oily sludge solid waste feeder to dry the water-containing oily sludge. The dried fine particles are transported to the slag grinder, realizing the synchronous progress of oily sludge drying and feeding. At the same time, it avoids the problem that liquid oily sludge adheres to components such as pipelines and rotating shafts when the equipment stops, resulting in equipment blockage and jamming after solidification, and increases the feeding efficiency of the equipment; by setting a negative pressure extraction device in the oily sludge solid waste feeder, it avoids the overflow of oily sludge and harmful gases, and increases the safety of the working environment; the dried fine particles are transported into the combustion boiler for combustion, reusing the heat in the original waste oily sludge, and at the same time introducing the flue gas into the oily sludge solid waste feeder to effectively utilize the heat of the originally discharged flue gas, minimizing energy loss to the greatest extent. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the oily sludge feeding device in an embodiment of this application.

[0018] Figure 2 It is a schematic internal structure diagram of the oily sludge solid waste feeder in an embodiment of this application.

[0019] Reference Numerals in the Drawings

[0020] 1 - vibrating screen.

[0021] 2 - oily sludge storage bin.

[0022] 3 - oily sludge solid waste feeder, 30 - solid material outlet, 31 - liquid outlet, 32 - flue gas inlet, 33 - feed inlet, 34 - stirring part, 35 - rotating shaft.

[0023] 4 - slag grinder.

[0024] 5 - combustion boiler.

[0025] 6 - Wastewater tank. Specific embodiments

[0026] The following further illustrates the specific embodiments of the present invention with reference to the accompanying drawings.

[0027] It is easy to understand that according to the technical solution of the present invention, under the condition of not changing the essence of the present invention, various structural forms and implementation methods that can be mutually replaced by those of ordinary skill in the art. Therefore, the following specific embodiments and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as all of the present invention or as a limitation or restriction on the technical solution of the invention.

[0028] The orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc. mentioned or possibly mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts and may therefore change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms either.

[0029] This application provides an oily sludge dosing device, including: a vibrating screen 1, an oily sludge storage bin 2, an oily sludge solid residue dosing machine 3, a slag grinder 4, and a combustion boiler 5.

[0030] Among them, Figure 1 The arrow direction on the solid line is the direction of the oily sludge and the dried fine particles, and the arrow direction on the dotted line is the direction of the flue gas. Please refer to Figure 1 , the vibrating screen 1 is provided with a screen mesh for screening out impurities in the oily sludge that are larger than the inner diameter of the mesh holes on the screen. The vibrating screen 1 removes large - sized impurities such as large - granular stones, used gloves, plastic bags, rubber, etc. carried in the oily sludge as over - size materials, and the over - size materials are collected and outsourced for disposal after collection.

[0031] The oily sludge storage bin 2 is connected to the discharge port of the vibrating screen 1 to store the material screened by the vibrating screen 1. The under - size material at the discharge port of the vibrating screen 1 is basically a liquid oily sludge with strong fluidity, high water and oil content, and is transported to the oily sludge storage bin 2 for temporary storage through an oily sludge pump.

[0032] The feed inlet 33 of the oily sludge solid residue dosing machine 3 is connected to the oily sludge storage bin 2, and the liquid oily sludge in the oily sludge storage bin 2 is transported to the oily sludge solid residue dosing machine 3 through an oily sludge pump. A stirring part 34 is arranged in the oily sludge solid residue dosing machine 3. The oily sludge solid residue dosing machine 3 is also provided with a solid material outlet 30 and a liquid outlet 31, and a negative pressure pumping device is provided at the solid material outlet 30.

[0033] The feed inlet of the slag grinder 4 is communicated with the solid material outlet 30, and the discharge outlet of the slag grinder 4 is communicated with the fuel inlet of the combustion boiler 5. The flue gas outlet of the combustion boiler 5 is controllably communicated with the flue gas inlet 32 of the oily sludge solid residue feeder 3 through a flue gas pipeline. The flue gas entering the oily sludge solid residue feeder 3 dries the oily sludge and carries the dried fine particles from the solid material outlet 30 to the feed inlet of the slag grinder 4.

[0034] Among them, a flow valve with adjustable opening is installed on the flue gas pipeline, and the opening of the flow valve is controlled manually or electrically to control the amount of flue gas entering the flue gas inlet 32.

[0035] The negative pressure extraction device can be an induced draft fan. The induced draft fan ensures that the cavity of the oily sludge solid residue feeder 3 is in a negative pressure environment, ensuring that solids, liquids, and gases do not overflow. The solid phase and gas phase enter the slag grinder 4, and the liquid phase is collected through the liquid outlet 31 and returned to the wastewater tank 6, and the system does not generate additional solid waste.

[0036] The flue gas in the combustion boiler 5 is introduced into the oily sludge solid residue feeder 3. The hot flue gas is in full contact with the oily sludge to dry the liquid oily sludge. The dried oily sludge generates fine particles, and the fine particles are carried by the hot air generated by the flue gas from the solid material outlet 30 to the feed inlet of the slag grinder 4. The water-bearing particles and large particles with larger mass in the oily sludge fall back into the cavity of the oily sludge solid residue feeder 3 under the action of gravity to be repeatedly dried and broken into fine particles. In addition, the flue gas in the combustion boiler 5 and the induced draft fan also form forced convection in the oily sludge solid residue feeder 3, increasing the drying effect on the oily sludge.

[0037] The fine particles are mixed and crushed with other combustible materials in the slag grinder 4 and then output to the combustion boiler 5 for combustion. The wastewater in the oily sludge solid residue feeder 3 is discharged through the bottom liquid outlet 31, collected by the liquid collector, and then introduced into the wastewater tank 6.

[0038] The oily sludge feeding device provided by the embodiment of the present application introduces the flue gas in the combustion boiler 5 into the oily sludge solid residue feeder 3 to dry the water-containing oily sludge. The dried fine particles are transported by the flue gas to the slag grinder 4, realizing the synchronous progress of oily sludge drying and feeding. At the same time, it avoids the problem that the liquid oily sludge adheres to components such as pipelines and rotating shafts when the equipment stops, resulting in equipment blockage and jamming after solidification, and increases the feeding efficiency of the equipment; by setting a negative pressure extraction device in the oily sludge solid residue feeder 3, it avoids the overflow of oily sludge and harmful gases, increasing the safety of the working environment; the dried fine particles are transported to the combustion boiler 5 for combustion, reusing the heat in the original waste oily sludge, and at the same time introducing the flue gas into the oily sludge solid residue feeder 3 to effectively utilize the heat of the originally discharged flue gas, minimizing the energy loss to the greatest extent.

[0039] In an alternative embodiment, the slag mill 4 further includes a raw coal feed inlet. The raw coal entering through the raw coal feed inlet is mixed with the fine particles located within the slag mill 4 and then enters the combustion boiler 5 for combustion. The fine particles after the sludge drying are mixed with the raw coal within the slag mill 4 and then jointly transported through a pipeline to the combustion boiler 5 for combustion. While the raw coal is burning, the heat originally in the waste sludge is reused again, avoiding environmental pollution and effectively utilizing the heat in the sludge.

[0040] Among them, grinding components such as a rotating cutter head and a pulverizing roller are provided within the slag mill 4 to crush and grind the input raw coal into pulverized coal. In an alternative embodiment, the slag mill 4 is configured as a coal mill.

[0041] In an alternative embodiment, the oily sludge feeding device further includes a control system. A humidity sensor is provided at the discharge opening of the vibrating screen 1 for real-time monitoring of the moisture content of the oily sludge at the discharge opening and feedback to the control system; the control system is controllably connected to the driving component of the stirring part 34 to change the operating frequency of the driving component according to the moisture content. When the humidity sensor detects an increase in the moisture content, the control system controls the operating frequency of the driving component in the stirring part 34 to increase, so as to increase the dehydration rate of the sludge and accelerate the drying effect of the sludge.

[0042] Among them, the driving component can be a driving motor. The output shaft of the driving motor is drivingly connected to the stirring part 34 to drive the stirring part 34 to rotate. The control system controls the rotation speed of the output shaft of the driving motor to control the stirring speed of the stirring part 34 for the sludge.

[0043] In an alternative embodiment, an oil-repellent coating is applied to the outer surface of the screen mesh of the vibrating screen 1. A vibrator with adjustable frequency is provided at the bottom of the vibrating screen 1. The vibrator vibrates the bottom of the vibrating screen 1 to remove the oily sludge adhering to the outer surface of the screen mesh. Through the combination of the oil-repellent coating and the vibrator, the problem of the screen mesh being blocked due to the adhesion of oily sludge is effectively avoided.

[0044] Among them, the oil-repellent coating can be a bionic super-oil-repellent micro-nano structure coating, a photocatalytic self-cleaning oil-repellent coating, etc. One end of the vibrator is installed on the screen mesh, and the other end is equipped with a vibration head, which periodically knocks on the screen mesh.

[0045] Furthermore, slide rails are provided on the screen mesh. The vibrator is slidably arranged on the slide rails through sliders to achieve position adjustment, matching the clogging removal requirements of different screen mesh areas.

[0046] In an alternative embodiment, the stirring part 34 includes a rotatably arranged rotating shaft 35, fan blades located on the rotating shaft 35, and a heating layer located on the fan blades. The heating layer is in communication with the flue gas inlet 32. The fan blades are used to agitate the oily sludge, and the heating layer is used to heat and dry the agitated oily sludge. Among them, the number of fan blades can be multiple, and the multiple fan blades are arranged and installed circumferentially around the rotating shaft 35 to efficiently stir the oily sludge.

[0047] In an alternative embodiment, a flue gas channel communicating the flue gas inlet 32 and the heating layer is provided on the rotating shaft 35, and the heating layer is a heat exchange channel provided outside the fan blades; or the heating layer is a heat flow channel provided inside the fan blades. An outlet and an inlet of the flue gas channel are provided on the side wall of the rotating shaft 35. Both the outlet and the inlet of the flue gas channel are located outside the oily sludge. The flue gas in the cavity of the oily sludge and solid residue feeder 3 enters the flue gas channel through the inlet on the rotating shaft 35, and then exchanges heat with the oily sludge through the heat exchange channel or the heat flow channel. The flue gas after heat exchange is discharged through the flue gas outlet on the rotating shaft 35. The present application can achieve the effect of effectively heating the agitated oily sludge while the fan blades are stirring.

[0048] Among them, the heating layer can be a housing covering the outside of the fan blades, and a gap is left between the inner side surface of the housing and the outer side surface of the fan blades to form a heat exchange channel.

[0049] Furthermore, a flue gas flow channel is also provided at the bottom of the cavity of the oily sludge and solid residue feeder 3. The inlet of this channel is in communication with the flue gas inlet 32, and the outlet extends to the solid material outlet 30. The oily sludge located at the bottom of the cavity of the oily sludge and solid residue feeder 3 can be dried through the flue gas flow channel, increasing the drying effect of the oily sludge.

[0050] In an alternative embodiment, the cavity of the oily sludge and solid residue feeder 3 is in a volute shape. The flue gas inlet 32 is located on the side wall of the cavity, the solid material outlet 30 is located at the outlet of the cavity, and the stirring part 34 is located between the flue gas inlet 32 and the solid material outlet 30. Please refer to Figure 2 , the rotating shaft 35 of the stirring part 34 is arranged at the center of the volute-shaped cavity. After the flue gas enters the cavity, it exchanges heat with the oily sludge through the stirring part 34 and is discharged from the solid material outlet 30. The inner side wall of the pipeline where the solid material outlet 30 is located is tangent to the side wall of the cavity, increasing the fluidity of the fine particles in the pipeline and avoiding material accumulation at the solid material outlet 30.

[0051] In an alternative embodiment, two crushing rollers are arranged in parallel inside the slag grinder 4, and the roller surface spacing between the two crushing rollers is adjustable. A particle size monitor is arranged at the outlet of the slag grinder 4. When the particle size of the material is greater than a preset value, the control system triggers an alarm and adjusts the roller surface spacing between the two crushing rollers. When the particle size monitor detects that the particle size value is greater than the preset value, it is not conducive to the full combustion of the material in the combustion boiler 5, and it is necessary to reduce the particle size of the material. The preset value can be 2 mm, 3 mm, or 4 mm, etc., and is specifically set according to the combustion condition of the combustion boiler 5.

[0052] The alarm device is located outside the oily sludge solid waste feeder 3. At this time, the control system controls the alarm device to trigger an alarm signal such as flashing or beeping to alert the operators. Among the two crushing rollers, both ends of one crushing roller are rotatably arranged on the sliding seat, and the piston rod of the driving cylinder is connected to the sliding seat. By controlling the synchronous telescopic movement of the piston rods of the two driving cylinders, the crushing roller is controlled to approach or move away from the other fixedly arranged crushing roller, thereby adjusting the roller surface spacing between the two crushing rollers.

[0053] In an alternative embodiment, a dust removal device is arranged in the flue gas pipeline. The dust removal device includes a hopper for collecting dust, and the hopper is connected to the feed inlet of the slag grinder 4 through a return pipe. The hopper collecting dust ensures the cleanliness of the flue gas entering the oily sludge solid waste feeder 3. At the same time, the collected dust is returned to the slag grinder 4 through the return pipe, realizing the reuse of the heat in the dust and avoiding environmental pollution.

[0054] In an alternative embodiment, the flue gas pipeline is connected to a waste heat recovery device through a branch pipeline before entering the oily sludge solid waste feeder 3. The waste heat recovery device includes a heat exchanger and a heat storage tank. The heat recovered by the waste heat recovery device is used to preheat the combustion-supporting air of the combustion boiler 5 or for heating the factory area. By constructing a waste heat cascade utilization network, the overall thermal efficiency of the system is effectively improved, and it has a significant energy-saving effect.

[0055] According to needs, the above technical solutions can be combined to achieve the best technical effect.

[0056] The above are only the principles and preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, based on the principles of the present invention, several other modifications can also be made, which should also be regarded as the protection scope of the present invention.

Claims

1. An oily sludge dosing device, characterized in that: include: A vibrating screen, wherein the vibrating screen is provided with a screen for screening out impurities in the oily sludge that are larger than the inner diameter of the mesh on the screen; An oil sludge storage bin is connected to the discharge port of the vibrating screen to store the oily sludge after being screened by the vibrating screen; An oil sludge solid residue doser, wherein the feed port of the oil sludge solid residue doser is connected to the oil sludge storage bin, a stirring part is arranged inside the oil sludge solid residue doser, the oil sludge solid residue doser is also provided with a solid material outlet and a liquid outlet, and the solid material outlet is provided with a negative pressure extraction device; A slag grinding machine, wherein the feed inlet of the slag grinding machine is connected to the solid material outlet, and the discharge port of the slag grinding machine is connected to the fuel inlet of the combustion boiler; A combustion boiler, wherein the flue gas outlet of the combustion boiler is controllably connected to the flue gas inlet of the oil sludge solid slag feeder through a flue gas duct, and the flue gas entering the oil sludge solid slag feeder dries the oily sludge and carries the dried fine particles from the solid material outlet to the feed port of the slag grinder.

2. The oily sludge dosing equipment according to claim 1, characterized in that: The slag grinding machine further comprises a raw coal feed port, and the raw coal entering through the raw coal feed port is mixed with the fine particles in the slag grinding machine and then enters the combustion boiler for combustion.

3. The oily sludge dosing equipment according to claim 1, characterized in that: The oily sludge dosing equipment also includes a control system, and the feed port of the vibrating screen is provided with a humidity sensor for real-time monitoring of the moisture content of the oily sludge at the feed port and feeding back to the control system; The control system is controllably connected to a driving component of the stirring portion so as to change an operating frequency of the driving component according to the moisture content.

4. The oily sludge dosing equipment according to claim 1, characterized in that: The outer surface of the mesh of the vibrating screen is coated with an oleophobic coating, and a frequency-adjustable rapper is arranged at the bottom of the vibrating screen. The rapper raps the bottom of the vibrating screen to remove the oil sludge adhered to the outer surface of the mesh.

5. The oily sludge dosing equipment according to claim 1, characterized in that: The stirring part comprises a rotatable rotating shaft, a fan blade located on the rotating shaft and a heating layer located on the fan blade, and the heating layer is connected to the smoke inlet.

6. The oily sludge dosing equipment according to claim 5, characterized in that: The heating layer is a heat exchange channel arranged outside the fan blade; Alternatively, the heating layer is a heat flow channel arranged inside the fan blade, and an air outlet connected to the heat flow channel is opened on the fan blade.

7. The oily sludge dosing equipment according to claim 1, characterized in that: The cavity of the sludge solid residue feeder is in the shape of a volute, the smoke inlet is located on the side wall of the cavity, the solid material outlet is located at the outlet of the cavity, and the stirring part is located between the smoke inlet and the solid material outlet.

8. The oily sludge dosing equipment according to claim 3, characterized in that: The slag grinder is provided with two crushing rollers arranged in parallel, and the roller surface spacing between the two crushing rollers is adjustable. A particle size monitor is provided at the outlet of the slag grinder. When the particle size of the material is greater than a preset value, the control system triggers an alarm and adjusts the roller surface spacing between the two crushing rollers.

9. The oily sludge dosing equipment according to any one of claims 1 to 8, characterized in that: A dust removal device is arranged in the flue gas duct, and the dust removal device comprises an ash hopper for collecting dust, and the ash hopper is connected to the feed port of the slag grinding machine through a return pipe.

10. The oily sludge dosing equipment according to any one of claims 1 to 8, characterized in that: The flue gas duct is connected to a waste heat recovery device through a branch pipe before entering the sludge solid residue feeder. The waste heat recovery device includes a heat exchanger and a heat storage tank. The heat recovered by the waste heat recovery device is used to preheat the combustion air of the combustion boiler or for heating the plant area.

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