Flue filter for rolling oil recovery and oil mist recovery system

Abstract

The utility model relates to a flue filter for rolling oil recovery and an oil mist recovery system with the flue filter. The flue filter for rolling oil recovery comprises a smoke filtering pipeline and a plate-shaped filter screen, an opening in one axial end of the smoke filtering pipeline is suitable for being communicated with a smoke exhaust outlet of a smoke suction hood of the rolling mill, the filter screen is located in the smoke filtering pipeline and provided with a connecting shaft, the connecting shaft is axially parallel to the plate face of the filter screen, and the two axial ends of the connecting shaft extend out of the side walls of the two opposite ends of the filter screen respectively. The two axial ends of the connecting shaft penetrate through the smoke filtering pipeline through the two connecting penetrating holes respectively, the connecting shaft is provided with a bearing so as to be rotatably connected with the side wall of the connecting penetrating holes, the axial direction of the bearing is consistent with that of the connecting shaft, and the two ends, penetrating out of the smoke filtering pipeline, of the connecting shaft are provided with first limiting parts. The content of solid pollutants in oil-containing flue gas can be reduced, and deposition of aluminum coils and aluminum powder at the bottom of an absorption tower is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of metal rolling, and in particular to a flue filter and an oil mist recovery system for recovering rolling oil. Background Art

[0002] During the rolling process of aluminum foil, deformation heat is generated due to the deformation of the metal. In order to remove the heat and provide reasonable lubrication, rolling oil is used as a lubricating coolant. Due to the deformation heat, part of the rolling oil is atomized to form oil droplets of different sizes suspended above the rollers, commonly known as rolling oil mist. In engineering, oil droplets larger than 5μm are usually called liquid oil mist, and oil droplets smaller than 5μm are called gaseous oil mist. Oil mist will have a serious impact on the environment and people's physical and mental health, so in the production process, how to control the hazards of oil mist will be a major problem. At present, the traditional control method is to set a smoke exhaust hood on the upper part of the rolling mill to collect and discharge the rolling oil mist in time, improve the working environment, and prevent fire hazards.

[0003] The oil mist recovery system is mainly divided into two stages during operation: absorption and desorption. The absorption is to dissolve and absorb the rolling oil mist in the flue gas by the absorbent, and the desorption is to separate the rolling oil dissolved in the absorbent from the absorbent by vacuum distillation. The oily flue gas generated by the rolling mill is extracted from the mill exhaust hood by a fan and then transported to the absorption tower for absorption.

[0004] However, the oily flue gas transported will carry aluminum coils, aluminum powder and oil droplets during the transportation process. After entering the absorption tower, as the operation time increases, the aluminum coils and aluminum powder will be deposited at the bottom of the tower and cause malfunctions, while the oil droplets will increase the energy consumption and desorption temperature of the subsequent desorption operation.

[0005] Therefore, how to reduce the deposition of solid pollutants in the absorption tower has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0006] In order to reduce the deposition of solid pollutants in an absorption tower, the present application provides a flue filter and an oil mist recovery system for rolling oil recovery.

[0007] In order to achieve the purpose of the utility model, a flue filter for rolling oil recovery is provided, comprising:

[0008] Smoke filter ducts and filters;

[0009] The axial opening at one end of the smoke filter pipe is suitable for communicating with the smoke exhaust outlet of the rolling mill smoke hood. The filter screen is in the shape of a plate as a whole. The filter screen is located in the smoke filter pipe. The filter screen and the smoke filter pipe match each other. The side wall of the smoke filter pipe is provided with a connecting through hole. The filter screen is provided with a connecting shaft. The connecting shaft is axially parallel to the plate surface of the filter screen. The axial ends of the connecting shaft respectively protrude from the opposite side walls of the filter screen. The axial ends of the connecting shaft respectively pass through the smoke filter pipe through the two connecting through holes. The connecting shaft is provided with a bearing so as to be rotatably connected to the side wall of the connecting through hole. The axial direction of the bearing is consistent with the axial direction of the connecting shaft. Both ends of the connecting shaft passing through the smoke filter pipe are provided with a first limiting portion.

[0010] According to another aspect of the present application, an oil mist recovery system is provided, comprising the aforementioned flue filter for rolling oil recovery.

[0011] The present application provides a relatively sealed circulation environment for smoke by setting up a smoke filter duct, and sets a filter in the smoke filter duct. Solid pollutants cannot pass through the filter, and oily smoke passes through the filter smoothly, thereby reducing the content of solid pollutants in the oily smoke. After the smoke is filtered, the absorbent absorption process of the absorption tower is carried out, which can effectively reduce the deposition of aluminum coils and aluminum powder at the bottom of the absorption tower and reduce the possibility of failure of the absorption tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram showing the structure of a flue filter for rolling oil recovery according to an embodiment of the present application;

[0013] Figure 2 A schematic diagram showing the structure of a flue filter for rolling oil recovery according to an embodiment of the present application;

[0014] Figure 3 A schematic diagram showing the structure of a flue filter for rolling oil recovery according to an embodiment of the present application;

[0015] Figure 4 A schematic structural diagram of a flue filter for rolling oil recovery according to an embodiment of the present application is shown.

[0016] The smoke filter duct 100 , the inspection port 110 , the flange 120 , the collecting groove 130 , the filter screen 200 , the connecting shaft 210 , the bearing 211 , the first limiting portion 212 , the differential pressure sensor 300 , the detection end 310 of the differential pressure sensor, and the second limiting portion 400 . DETAILED DESCRIPTION

[0017] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0018] Among them, it should be understood that the directions or positional relationships indicated by terms such as "length", "width", "height", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0019] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0020] According to one aspect of the present application, a flue filter for rolling oil recovery is provided, including a smoke filter pipe 100 and a filter screen. The axial end opening of the smoke filter pipe 100 is suitable for connecting with the smoke exhaust outlet of the rolling mill smoke hood. The filter screen is plate-shaped as a whole. The filter screen is located in the smoke filter pipe 100. The filter screen and the smoke filter pipe 100 match. The side wall of the smoke filter pipe 100 is provided with a connecting perforation. The filter screen is provided with a connecting part. The connecting part passes through the smoke filter pipe 100 through the connecting perforation. The connecting part is provided with a bearing 211 to be rotatably connected to the side wall of the connecting perforation. The filter screen 200 is also provided with a rotation locking mechanism, which allows the filter screen 200 to rotate, and can lock the filter screen 200 after the filter screen 200 is rotated into place to prevent the filter screen 200 from rotating at will under the action of wind pressure. The present application does not make any specific restrictions on the rotation locking mechanism. A bearing 211 with greater resistance can be used. A fixed support member that can be extended or rotated to adapt to angle changes can be set at one end of the connection part. A driving device can be set to drive the filter 200 to rotate. The driving end of the driving device is fixedly connected to the connection part, and a locking mechanism is set for the rotation driving device. After rotating into place, it is fixed and does not rotate. As long as the risk of arbitrary rotation of the filter 200 can be reduced, it will be sufficient.

[0021] The present application provides a relatively sealed circulation environment for smoke by setting up a smoke filter duct 100, and sets a filter in the smoke filter duct 100. Solid pollutants cannot pass through the filter 200, and the oily smoke passes through the filter 200 smoothly, thereby reducing the content of solid pollutants in the oily smoke. After the smoke is filtered, the absorbent absorption process of the absorption tower is carried out, which can effectively reduce the deposition of aluminum coils and aluminum powder at the bottom of the absorption tower and reduce the possibility of failure of the absorption tower.

[0022] In addition, the smoke wind pressure of metal rolling is relatively large, and the filter 200 is relatively dense. When a large impact force occurs, the filter 200 can be rotated at one end of the connection part to rotate a pressure relief gap between the filter 200 and the inner wall of the smoke filter duct 100, which has a safety and explosion-proof effect.

[0023] In one possible implementation, Figure 2 As shown, a maintenance port 110 is provided on the side wall of the smoke filter pipe, which is convenient for inspecting, repairing and replacing the components in the smoke filter pipe, such as the filter screen 200. The maintenance port 110 is provided with a cover, which matches the maintenance port 110, and the cover and the maintenance port 110 are detachably connected. Under normal working conditions, the cover covers the maintenance port 110, and the connection is sealed to prevent smoke leakage and rolling oil loss. Under the inspection and maintenance state, the smoke filter is not working, and the cover can be removed for maintenance.

[0024] In a possible implementation, two connecting parts are respectively provided at two opposite ends of the filter along the rotation axis, and the bearings 211 of the two connecting parts are axially aligned.

[0025] In one possible implementation, the filter is provided with a connecting shaft 210, which is parallel to the plate surface of the filter, and the axial ends of the connecting shaft 210 respectively extend out of the opposite side walls of the filter, and the axial ends of the connecting shaft 210 serve as two connecting parts to pass through the smoke filter pipe 100, and the axial direction of the bearing 211 of the connecting part is consistent with the axial direction of the connecting shaft 210.

[0026] In a possible implementation, first limiting portions 212 are provided at both ends of the connecting shaft 210 passing through the smoke filter pipe 100 .

[0027] In a possible implementation, a handle is provided at the protruding end of the connecting portion.

[0028] In a possible implementation, the filter screen is in the shape of a rectangular plate, and the cross section of the smoke filter duct 100 along its radial direction is in a matching rectangular shape.

[0029] In a possible implementation, connecting flanges 120 are provided on both side walls of the smoke filter pipe along the axial direction.

[0030] In a possible implementation, the filter 200 is detachably connected to the smoke filter pipe 100. It should be noted that the present application does not specifically limit the detachable installation of the filter 200 on the smoke filter pipe 100, as long as the filter 200 can be rotated in the connected state, can be removed from the inside of the smoke filter pipe 100 in the disassembled state, and the new filter 200 can be reinstalled to continue filtering and rotating. The outer ring of the bearing 211 is fixed to the inner wall of the connecting perforation, the filter 200 is provided with a plug-in slide rail, and the connecting shaft 210 is slidably plugged with the filter 200 and the inner ring of the bearing 211. When the filter 200 needs to be removed, the connecting shaft 210 is slid out, the connection state of the filter 200 through the connecting shaft 210 and the smoke filter pipe 100 is cancelled, and the drying net in the smoke filter pipe 100 is pulled out. Further, the first limit portion 212 is provided at both ends of the connecting shaft 210, and one end of the connecting shaft 210 is detachably connected to the first limit portion 212. The connection method between the first limit portion 212 at the other end and the connecting shaft 210 is not specifically limited, and can be fixedly connected or detachably connected. The side wall of this end that passes through the filter smoke pipe 100 can also be provided with a handle for rotation operation or connected to an external drive device to drive the filter screen 200 to rotate. Alternatively, the filter screen 200 and the connecting shaft 210 are detachably connected, such as a snap-on connection. The filter smoke pipe 100 includes a detachably connected front flue and a rear flue. The connecting perforation is spliced ​​by the gaps of the front and rear flues. For example, the front and rear flues are coaxially plugged and connected. A sealing ring is provided between the front and rear flues at the plug-in position to ensure the sealing performance and prevent smoke leakage. The outer ring of the bearing 211 is fixed to the gap of the front flue or the gap of the rear flue. When the filter screen 200 needs to be removed, the connection between the front and rear flues is released, and the filter screen 200 is removed from the connecting shaft 210 and replaced and reinstalled.

[0031] In a possible implementation, the flue filter for rolling oil recovery is also provided with a differential pressure sensor 300 to detect the flue gas pressure difference before and after the filter screen is filtered; the two detection ends 310 of the differential pressure sensor 300 are both located in the smoke filter pipe 100, and the filter screen is located between the two detection ends 310 of the differential pressure sensor 300. The filter screen's pass rate is determined according to the differential pressure on both sides of the filter screen 200 to prevent solid matter from blocking the smoke channel and thus reducing the smoke filtering efficiency, and the filter screen 200 is rotated and adjusted in time to adjust the angle or disassemble and replace (preferably by pull-out replacement) a new filter screen 200. The differential pressure sensor 300 is provided with a display screen to digitally display the differential pressure value. The differential pressure sensor 300 can also be provided with an alarm to emit an audible and visual alarm when the differential pressure value is abnormal, preferably an indicator light or a speaker.

[0032] The filtering capacity of the filter 200 has a limit value. Solid pollutants cannot pass through the filter 200 but will adhere to one side of the filter 200 under the action of wind pressure, blocking the filtering channel, which will reduce the filtering speed. Failure to remove the attachments or replace the filter 200 in time will cause the filter to fail. The filter 200 can be detachably connected to the smoke filter pipe 100 for replacement, or a second limiter 400 or a vibrator can be set in the smoke filter pipe 100 to remove the attachments and extend the replacement interval of the filter.

[0033] In a possible implementation, the inner wall of the smoke filter pipe is provided with a second limiter 400, and the second limiter 400 is installed in the rotation track of the filter screen 200 to limit the rotation of the filter screen 200, and the filter screen 200 is blocked by the second limiter 400 during rotation. It should be noted that along the radial direction of the smoke filter pipe, the preset length of the second limiter 400 is much smaller than the preset length of the filter screen 200, and it can only be limited to block the vibration, and the pressure relief gap and the circulation of smoke after rotation are less disturbed. The operator can operate the rotating filter screen 200 through the end of the connecting part, so that it repeatedly moves away from the second limiter 400, and the filter screen 200 is vibrated by multiple blows to shake off the attachments attached to the front side of the filter screen 200. Alternatively, a vibrator is set on the filter screen 200, and the vibrator is suitable for vibrating the filter screen 200 to shake off the attachments, reduce the blockage of the filter screen 200, and extend the continuous working time of the filter screen 200. The vibrator is preferably an ultrasonic vibrator. The vibrator can be operated independently and vibrated regularly, or it can be wirelessly connected to an external controller to receive an external control signal to start or stop vibration. The output end of the differential pressure sensor 300 is connected to the vibrator or an external controller connected to the vibrator, and the pipe wall vibration operation is started / stopped according to the pressure difference measurement result. The output end of the differential pressure sensor 300 is electrically connected to the driving device that drives the filter 200 to rotate, and the rotation process of repeatedly striking the oscillating filter 200 is started / stopped according to the pressure difference measurement result.

[0034] Furthermore, a collecting groove 130 is provided on the inner wall of the smoke filter pipe, and the collecting groove 130 is located at one end of the smoke filter pipe along its radial direction (perpendicular to the smoke flow direction, that is, axial direction, and cannot be understood as a restriction on the shape and structure of the smoke filter pipe). The collecting groove 130 is arranged opposite to the front side surface filtered by the filter screen 200 to collect solid pollutants shaken off therefrom. The front side surface filtered by the filter screen 200 refers to the side surface of the two side surfaces of the plate-like structure of the filter screen 200, which is closer to the front side along the smoke flow direction.

[0035] According to another aspect of the present application, an oil mist recovery system is provided, comprising the aforementioned flue filter for rolling oil recovery.

[0036] In a possible implementation, the oil mist recovery system further includes a smoke hood, an absorption tower and a desorption device (preferably a vacuum distillation device). The inlet of the smoke hood is arranged above the metal rolling mill to absorb the smoke generated during the metal rolling process. The outlet of the smoke hood is connected to the inlet of the smoke filter pipe 100 (one axial end is open) of the aforementioned flue filter for rolling oil recovery, and is used to filter solid pollutants in the smoke that are drawn in due to excessive wind pressure. The outlet of the smoke filter pipe 100 (the other axial end is open) is connected to the input end of the absorption tower, and an absorbent is used to absorb the oil in the filtered smoke. The absorbent that has absorbed the oil is used as a raw material for vacuum distillation to recover the rolling oil, and the rolling oil is reused to reduce the rolling cost.

[0037] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A flue filter for rolling oil recovery, characterized in that: include: Smoke filter ducts and filters; The axial opening at one end of the smoke filter pipe is suitable for communicating with the smoke exhaust outlet of the rolling mill smoke hood. The filter screen is in the shape of a plate as a whole. The filter screen is located in the smoke filter pipe. The filter screen and the smoke filter pipe match each other. The side wall of the smoke filter pipe is provided with a connecting through hole. The filter screen is provided with a connecting shaft. The connecting shaft is axially parallel to the plate surface of the filter screen. The axial ends of the connecting shaft respectively protrude from the opposite side walls of the filter screen. The axial ends of the connecting shaft respectively pass through the smoke filter pipe through the two connecting through holes. The connecting shaft is provided with a bearing so as to be rotatably connected to the side wall of the connecting through hole. The axial direction of the bearing is consistent with the axial direction of the connecting shaft. Both ends of the connecting shaft passing through the smoke filter pipe are provided with a first limiting portion.

2. The flue filter for rolling oil recovery according to claim 1, characterized in that: A handle is provided at the protruding end of the connecting shaft.

3. The flue filter for rolling oil recovery according to claim 1, characterized in that: The filter screen is in the shape of a rectangular plate, and the cross section of the smoke filter pipe along its radial direction is in a matching rectangular shape.

4. The flue filter for rolling oil recovery according to claim 1, characterized in that: The smoke filter pipe is provided with connecting flanges on both side walls along the axial direction.

5. The flue filter for rolling oil recovery according to claim 1, characterized in that: The filter screen is detachably connected to the smoke filter pipe.

6. The flue filter for rolling oil recovery according to claim 1, characterized in that: The flue filter for rolling oil recovery is also provided with a pressure difference sensor to detect the pressure difference of flue gas before and after filtering by the filter; The two detection ends of the pressure difference sensor are both located in the smoke filter pipe, and the filter screen is located between the two detection ends of the pressure difference sensor.

7. An oil mist recovery system, characterized in that: include: A flue filter for rolling oil recovery as described in any one of claims 1 to 6.

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