An oily sludge dosing device

Abstract

This application discloses an oily sludge feeding device, comprising: a vibrating screen equipped with a screen mesh for removing impurities larger than the inner diameter of the screen mesh from the oily sludge; an oily sludge storage bin connected to the discharge port of the vibrating screen for storing the oily sludge after screening; an oily sludge solid residue feeder with its inlet connected to the oily sludge storage bin, the feeder having a stirring section, a solid material outlet, and a liquid outlet, the solid material outlet being equipped with a negative pressure device; a grinding mill with its inlet connected to the solid material outlet, and its outlet connected to the fuel inlet of a combustion boiler; and a flue gas outlet of the combustion boiler and the flue gas inlet of the oily sludge solid residue feeder being controllably connected via a flue gas pipeline. This application reduces equipment blockage, avoids material leakage and dust overflow, and improves combustion efficiency by reducing the moisture content of the oily sludge through drying.

Description

Technical Field

[0001] This application relates to the field of oily sludge conveying technology, and in particular to an oily sludge dosing device. Background Technology

[0002] Oily sludge refers to sludge mixed with crude oil, various refined oil products, residual oil, and other heavy oils. It is a mixture formed when crude oil or refined oil leaks, spills, drips, or overflows onto the ground and settles in oceans, lakes, and rivers due to accidents, improper operation, outdated equipment, damage, or corrosion during oilfield extraction, petroleum refining, transportation, use, and storage, mixing with soil and water. Treatment methods for oily sludge mainly include physical, chemical, biological, and thermal methods, each with its unique applicable scenarios and advantages and disadvantages. Oily sludge is not a single liquid or solid phase, but a solid or semi-solid complex composed of petroleum hydrocarbons, water, solid particles, and other substances. It includes petroleum hydrocarbons, water, solid particles, colloids, asphaltenes, and toxic and harmful substances such as benzene compounds, anthracene, phenols, and pyrene, and may even contain radioactive materials and heavy metals. Therefore, how to safely and rationally add oily sludge to treatment facilities has become a problem that needs to be addressed.

[0003] Currently, oily sludge is mostly added via sludge pumps, screw conveyors, and scraper conveyors. However, these methods have several drawbacks: First, equipment blockage occurs. Oily sludge contains particulate impurities, which accumulate during normal pipeline transport, reducing the conveying cross-section. Additionally, the sludge's viscosity causes it to adhere to pipes, shafts, and other components when the equipment is shut down, solidifying and causing blockages and reducing delivery efficiency. Second, leakage and spillage occur. Conveying equipment is often under positive or normal pressure, which deteriorates with prolonged operation, leading to leakage and odor escape. The high oil content of the sludge can cause safety issues after evaporation. Third, moisture content cannot be controlled. Some oily sludge has a moisture content as high as 80%, which, when directly mixed with raw coal, reduces the fuel's calorific value and affects combustion efficiency in boilers. Summary of the Invention

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

[0005] This application provides an oily sludge feeding device, comprising: a vibrating screen equipped with a screen mesh for screening out impurities larger than the inner diameter of the screen mesh openings in the oily sludge; an oily sludge storage bin connected to the discharge port of the vibrating screen for storing the oily sludge after screening by the vibrating screen; and an oily sludge solid residue feeding machine, the inlet of which is connected to the oily sludge storage bin, the machine being equipped with a stirring section and a solid material outlet. The machine includes a solid material outlet and a liquid outlet, with the solid material outlet equipped with a negative pressure device; a grinding mill, the feed inlet of which is connected to the solid material outlet, and the discharge outlet of which is connected to the fuel inlet of the combustion boiler; and a combustion boiler, the flue gas outlet of which is controllably connected to the flue gas inlet of the oil sludge solid slag feeder via a flue gas pipeline, wherein 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 inlet of the grinding mill.

[0006] Optionally, the slag mill further includes a raw coal inlet, through which the raw coal entering the slag mill is mixed with the fine particles located inside the slag mill before entering the combustion boiler for combustion.

[0007] Optionally, the oily sludge feeding device further includes a control system. The discharge port of the vibrating screen is equipped with a humidity sensor to monitor the moisture content of the oily sludge at the discharge port in real time and feed it back to the control system. The control system is connected to the drive component of the stirring unit to change the operating frequency of the drive component according to the moisture content.

[0008] Optionally, the outer surface of the screen of the vibrating screen is coated with an oleophobic coating, and the bottom of the vibrating screen is provided with a frequency-adjustable vibrator, which vibrates the bottom of the vibrating screen to remove the sludge adhering to the outer surface of the screen.

[0009] Optionally, the stirring unit includes a rotatable shaft, fan blades located on the shaft, and a heating layer located on the fan blades, the heating layer being connected to the flue gas inlet.

[0010] Optionally, the heating layer is a heat exchange channel disposed on the outside of the fan blade; or the heating layer is a heat flow channel disposed inside the fan blade, and the fan blade has an air outlet connected to the heat flow channel.

[0011] Optionally, the cavity of the sludge feeder is volute-shaped, 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, the grinding mill is equipped with two parallel crushing rollers, the roller surface distance between the two crushing rollers is adjustable, and a particle size monitor is installed at the outlet of the grinding mill. When the particle size of the material is greater than a preset value, the control system triggers an alarm and adjusts the roller surface distance between the two crushing rollers.

[0013] Optionally, a dust removal device is provided in the flue gas duct, the dust removal device including a dust hopper for collecting dust, the dust hopper being connected to the feed inlet of the slag mill via a return pipe.

[0014] Optionally, the flue gas duct is connected to a waste heat recovery device via a branch pipe before entering the sludge and 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.

[0015] The above technical solution has the following beneficial effects:

[0016] The oily sludge feeding equipment provided in this application dries the water-containing oily sludge by introducing flue gas from a combustion boiler into an oily sludge solidification feeder. The dried fine particles are then conveyed to a grinding mill, achieving simultaneous oily sludge drying and feeding. This avoids the problem of liquid oily sludge adhering to pipes, shafts, and other components when the equipment is shut down, causing blockages and jamming after solidification, thus increasing the feeding efficiency of the equipment. By installing a negative pressure extraction device in the oily sludge solidification feeder, the overflow of oily sludge and harmful gases is prevented, increasing the safety of the working environment. The dried fine particles are conveyed to the combustion boiler for combustion, reusing the heat from the original waste oily sludge. At the same time, the flue gas is introduced into the oily sludge solidification feeder, effectively utilizing the heat from the originally discharged flue gas and minimizing energy loss. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an oily sludge dosing device in one embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the internal structure of the sludge and solid residue feeding machine in one embodiment of this application.

[0019] Attached icon number

[0020] 1-Vibrating screen.

[0021] 2-Oil sludge storage bin.

[0022] 3-Oil sludge and solid residue feeder, 30-Solid material outlet, 31-Liquid outlet, 32-Flue gas inlet, 33-Feed inlet, 34-Mixing section, 35-Rotating shaft.

[0023] 4-Slag grinding mill.

[0024] 5- Combustion boiler.

[0025] 6-Wastewater pool. Detailed Implementation

[0026] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0027] It is readily understood that, based on the technical solution of this invention, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of the invention.

[0028] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

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

[0030] in, Figure 1 The arrows on the solid line indicate the direction of the sludge and dried fine particles, while the arrows on the dashed line indicate the direction of the flue gas. Please refer to [the provided text]. Figure 1 The vibrating screen 1 is equipped with a screen mesh for screening out impurities larger than the inner diameter of the mesh openings in the oily sludge. The vibrating screen 1 removes large particles such as stones, waste gloves, plastic bags, and rubber carried in the oily sludge as oversize material, which is then collected and disposed of externally.

[0031] The sludge storage bin 2 is connected to the discharge port of the vibrating screen 1 to store the material after being screened by the vibrating screen 1. The material underfilled from the discharge port of the vibrating screen 1 is mainly liquid sludge with high fluidity and high water and oil content, which is temporarily stored in the sludge storage bin 2 by the sludge pump.

[0032] The inlet 33 of the sludge feeder 3 is connected to the sludge storage bin 2. The liquid sludge in the sludge storage bin 2 is pumped to the sludge feeder 3. The sludge feeder 3 is equipped with a stirring unit 34. The sludge feeder 3 is also provided with a solid material outlet 30 and a liquid outlet 31. The solid material outlet 30 is equipped with a negative pressure device.

[0033] The feed inlet of the slag mill 4 is connected to the solid material outlet 30, and the discharge outlet of the slag mill 4 is connected to the fuel inlet of the combustion boiler 5. The flue gas outlet of the combustion boiler 5 is controllably connected to the flue gas inlet 32 ​​of the oil sludge solid residue feeder 3 via a flue gas pipeline. The flue gas entering the oil 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 mill 4.

[0034] The flue gas duct is equipped with an adjustable flow valve. The opening of the flow valve can be controlled manually or electrically to control the amount of flue gas entering the flue gas inlet 32.

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

[0036] Flue gas from the combustion boiler 5 is introduced into the sludge solidification feeder 3. The hot flue gas comes into full contact with the sludge, drying the liquid sludge. The dried sludge is broken down into fine particles, which are carried by the hot air generated by the flue gas through the solid material outlet 30 to the feed inlet of the grinding mill 4. Larger water-laden particles and large particles in the sludge fall back into the cavity of the sludge solidification feeder 3 under gravity for repeated drying and breaking down into fine particles. In addition, the flue gas from the combustion boiler 5 and the induced draft fan create forced convection within the sludge solidification feeder 3, increasing the drying effect on the sludge.

[0037] Fine particles are mixed and crushed with other combustible materials in the slag mill 4 and then output to the combustion boiler 5 for combustion. Wastewater in the oil sludge solid residue feeder 3 is discharged through the bottom liquid outlet 31 to the liquid collector and then introduced into the wastewater pool 6.

[0038] The oily sludge feeding equipment provided in this application introduces flue gas from the combustion boiler 5 into the oily sludge solidification feeder 3 to dry the water-containing oily sludge. The dried fine particles are then transported by the flue gas to the grinding mill 4, achieving simultaneous oily sludge drying and feeding. This also avoids the problem of liquid oily sludge adhering to pipes, shafts, and other components when the equipment is shut down, causing blockages and jamming after solidification, thus increasing the feeding efficiency of the equipment. By setting a negative pressure device in the oily sludge solidification feeder 3, the overflow of oily sludge and harmful gases is prevented, 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. At the same time, the flue gas is introduced into the oily sludge solidification feeder 3, effectively utilizing the heat of the originally discharged flue gas and minimizing energy loss.

[0039] In an optional embodiment, the slag mill 4 further includes a raw coal inlet. The raw coal entering through the raw coal inlet is mixed with the fine particles located inside the slag mill 4 and then enters the combustion boiler 5 for combustion. The fine particles after the oil sludge has been dried are mixed with the raw coal inside the slag mill 4 and then transported together through pipelines to the combustion boiler 5 for combustion. While the raw coal is being burned, the heat in the original waste oil sludge is reused, avoiding environmental pollution while effectively utilizing the heat in the oil sludge.

[0040] The slag mill 4 is equipped with grinding components such as a rotating cutterhead and crushing rollers to crush and grind the raw coal into coal powder. In an optional embodiment, the slag mill 4 is configured as a coal mill.

[0041] In an optional embodiment, the oily sludge feeding device further includes a control system. A humidity sensor is installed at the discharge port of the vibrating screen 1 to monitor the moisture content of the oily sludge at the discharge port in real time and feed it back to the control system. The control system is connected to the drive component of the stirring unit 34 to adjust the operating frequency of the drive component according to the moisture content. When the humidity sensor detects an increase in moisture content, the control system controls the operating frequency of the drive component in the stirring unit 34 to increase the dewatering rate of the oily sludge and accelerate the drying effect.

[0042] The driving component can be a drive motor, and the output shaft of the drive motor is driven to the stirring part 34 to drive the stirring part 34 to rotate. The control system controls the stirring speed of the stirring part 34 on the sludge by controlling the rotation speed of the output shaft of the drive motor.

[0043] In an optional embodiment, the outer surface of the screen mesh of the vibrating screen 1 is coated with an oleophobic coating, and a frequency-adjustable vibrator is provided at the bottom of the vibrating screen 1. The vibrator vibrates the bottom of the vibrating screen 1 to remove the oil sludge adhering to the outer surface of the screen mesh. The combination of the oleophobic coating and the vibrator effectively avoids the problem of screen clogging caused by oil sludge adhering to the screen mesh.

[0044] The oleophobic coating can be a biomimetic superoleophobic micro / nano structure coating, a photocatalytic self-cleaning oleophobic coating, etc. One end of the vibrator is installed on the screen, and the other end is equipped with a vibrating head, which periodically taps the screen.

[0045] Furthermore, the screen is equipped with a slide rail, and the vibrator is positioned on the slide rail by sliding a slider to match the unclogging needs of different screen areas.

[0046] In an optional embodiment, the stirring unit 34 includes a rotatable shaft 35, fan blades located on the shaft 35, and a heating layer located on the fan blades, the heating layer being connected to the flue gas inlet 32. The fan blades are used to agitate the sludge, and the heating layer is used to heat and dry the agitated sludge. Multiple fan blades can be arranged circumferentially around the shaft 35 for efficient agitation of the sludge.

[0047] In an optional embodiment, the rotating shaft 35 has a flue gas channel connecting the flue gas inlet 32 ​​and the heating layer, wherein the heating layer is a heat exchange channel located on the outside of the fan blade; or the heating layer is a heat flow channel located inside the fan blade. The rotating shaft 35 has an outlet and an inlet for the flue gas channel, both located on the outside of the sludge. The flue gas in the sludge solids feeder 3 chamber enters the flue gas channel through the inlet on the rotating shaft 35, and then exchanges heat with the sludge through the heat exchange channel or heat flow channel. The heated flue gas is discharged through the flue gas outlet on the rotating shaft 35. This application can achieve the effect of effectively heating the stirred sludge while the fan blade is stirring.

[0048] The heating layer can be a shell covering the outside of the fan blades, with a gap between the inner side of the shell and the outer side of the fan blades to form a heat exchange channel.

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

[0050] In an optional embodiment, the cavity of the sludge feeder 3 is volute-shaped, 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 unit 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 section 34 is located at the center of the volute-shaped cavity. After the flue gas enters the cavity, it exchanges heat with the sludge through the stirring section 34 and is then discharged from the solid material outlet 30. The inner wall of the pipe where the solid material outlet 30 is located is tangent to the side wall of the cavity, which increases the fluidity of fine particles in the pipe and avoids material accumulation at the solid material outlet 30.

[0051] In an optional embodiment, the grinding mill 4 is equipped with two parallel crushing rollers, the distance between the roller surfaces of the two crushing rollers is adjustable, and a particle size monitor is installed at the outlet of the grinding mill 4. When the particle size of the material is greater than a preset value, the control system triggers an alarm and adjusts the distance between the roller surfaces of the two crushing rollers. When the particle size monitor detects a particle size value greater than the preset value, it is not conducive to the complete combustion of the material in the combustion boiler 5, and the particle size of the material needs to be reduced. The preset value can be 2mm, 3mm, or 4mm, etc., and is specifically set according to the combustion conditions of the combustion boiler 5.

[0052] The alarm device is located outside the sludge and solid residue feeder 3. The control system triggers the alarm device to emit a flashing light or a buzzer, alerting the operators. Of the two crushing rollers, one has both ends rotatably mounted on a sliding seat. The sliding seat is connected to the piston rod of a drive cylinder. By controlling the synchronous extension and retraction of the piston rods of the two drive cylinders, the crushing roller is moved closer to or away from the other fixed crushing roller, thereby adjusting the distance between the two crushing roller surfaces.

[0053] In an optional embodiment, a dust removal device is installed in the flue gas duct. The dust removal device includes an ash hopper for collecting dust, and the ash hopper is connected to the feed inlet of the slag mill 4 via a return pipe. The dust collection in the ash hopper ensures the cleanliness of the flue gas entering the sludge feeder 3, while the collected dust is returned to the slag mill 4 via the return pipe, realizing the reuse of heat in the dust and avoiding environmental pollution.

[0054] In an optional embodiment, the flue gas duct is connected to a waste heat recovery device via a branch pipe before entering the sludge and solid residue 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 air of the combustion boiler 5 or for plant heating. By constructing a waste heat cascade utilization network, the overall thermal efficiency of the system is effectively improved, resulting in significant energy savings.

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

[0056] The above are merely the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. An oily sludge feeding device characterized by comprising: include: A vibrating screen, wherein the vibrating screen is equipped with a screen mesh for screening out impurities in oily sludge that are larger than the inner diameter of the mesh openings of the screen mesh; An oil sludge storage bin is connected to the discharge port of the vibrating screen to store oily sludge after it has been screened by the vibrating screen. The sludge feeder has an inlet connected to the sludge storage bin, a stirring unit inside the sludge feeder, a solid material outlet and a liquid outlet, and a negative pressure device at the solid material outlet. A slag grinding mill, wherein the feed inlet of the slag grinding mill is connected to the solid material outlet, and the discharge outlet of the slag grinding mill is connected to the fuel inlet of a combustion boiler; A combustion boiler is provided, wherein the flue gas outlet of the combustion boiler is controllably connected to the flue gas inlet of the oil sludge solid slag feeder via a flue gas pipeline. 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 inlet of the slag grinding mill. The cavity of the oil sludge solid slag feeder is volute-shaped, 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 section is located between the flue gas inlet and the solid material outlet. The stirring unit includes a rotatable shaft, fan blades on the shaft, and a heating layer on the fan blades. The heating layer is connected to the flue gas inlet. The heating layer is a heat exchange channel located on the outside of the fan blades; or the heating layer is a heat flow channel located inside the fan blades, and the fan blades have an air outlet connected to the heat flow channel.

2. The oily sludge dosing equipment according to claim 1, characterized in that, The slag mill also includes a raw coal inlet, through which the raw coal entering the slag mill is mixed with the fine particles located inside the slag mill before entering the combustion boiler for combustion.

3. The oily sludge dosing equipment according to claim 1, characterized in that, The oily sludge feeding equipment also includes a control system. The discharge port of the vibrating screen is equipped with a humidity sensor to monitor the moisture content of the oily sludge at the discharge port in real time and feed it back to the control system. The control system is connected to the drive component of the stirring unit to change the operating frequency of the drive component according to the moisture content.

4. The oily sludge dosing equipment according to claim 1, characterized in that, The outer surface of the screen of the vibrating screen is coated with an oleophobic coating, and an adjustable frequency vibrator is provided at the bottom of the vibrating screen to vibrate the bottom of the vibrating screen to remove the oil sludge adhering to the outer surface of the screen.

5. The oily sludge dosing equipment according to claim 3, characterized in that, The grinding mill is equipped with two parallel crushing rollers, and the distance between the roller surfaces of the two crushing rollers is adjustable. A particle size monitor is installed at the outlet of the grinding mill. When the particle size of the material is greater than a preset value, the control system triggers an alarm and adjusts the distance between the roller surfaces of the two crushing rollers.

6. The oily sludge dosing equipment according to any one of claims 1-5, characterized in that, The flue gas duct is equipped with a dust removal device, which includes an ash hopper for collecting dust. The ash hopper is connected to the feed inlet of the slag mill through a return pipe.

7. The oily sludge dosing equipment according to any one of claims 1-5, characterized in that, Before entering the sludge and solid residue feeder, the flue gas duct is connected to a waste heat recovery device via a branch pipe. 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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