A rolling oil recovery device for the mist exhaust system of a stainless steel cold rolling mill

Abstract

The present invention belongs to the technical field of stainless steel cold rolling, and specifically provides a rolling oil recovery device for a stainless steel cold rolling mill demisting system, including a rolling oil collection tank, a water accumulation alarm separator and a water accumulation collection tank for collecting the oil discharged from the oil return point in the demisting system; the rolling oil collection tank includes a reflux area and an adjacent sedimentation overflow area, and when the rolling oil in the reflux area is full, it overflows to the sedimentation overflow area; the bottom of the sedimentation overflow area is connected to the input end of the water accumulation alarm separator, and the output end of the water accumulation alarm separator is connected to the water accumulation collection tank. The oil discharged from the oil return points such as the air duct, oil mist, fan and chimney in the demisting system is collected, and the water is removed, the oil is graded and precipitated, and the oil is pumped to the dirty oil tank of the rolling oil system after filtering, thereby reducing the consumption of rolling oil. In addition, the scheme makes the rolling oil discharged from the demisting system relatively clean after being filtered by closed sedimentation, and the burden of the filtering equipment is also reduced after it is sent back to the rolling oil system.

Description

Technical Field

[0001] The invention belongs to the technical field of stainless steel cold rolling, and in particular relates to a rolling oil recovery device of a mist exhaust system of a stainless steel cold rolling mill. Background Art

[0002] Stainless steel cold rolling generally uses 18-roll continuous rolling mill or 20-roll reversible rolling mill, and a large amount of process lubricating fluid will be sprayed during rolling. In order to ensure the high quality of rolled products, pure rolling oil is usually used as the process lubricating medium. Since rolling oil is expensive, the consumption of rolling oil per ton of steel directly affects the production cost, and the consumption of rolling oil is generally caused by plate surface residue, leakage, filtration system consumption and demisting system consumption; due to the high heat generated by the roller system during stainless steel rolling, the rolling oil sprayed into the frame will produce a large amount of oil mist, which will be pumped to the oil mist filter through the demisting system and then discharged into the atmosphere. According to incomplete statistics, the consumption of the demisting system accounts for more than 30% of the rolling oil consumption. The waste oil generated by the condensation of the demisting system is usually directly sent to the wastewater treatment station or the rolling oil tank. The former not only causes the waste of rolling oil but also increases the processing capacity of the wastewater treatment station. Although the latter refluxes part of the waste liquid, the high impurity content of the waste liquid will increase the burden of the rolling oil filtration system, affect the filtration effect, and then affect the surface quality of the strip. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a rolling oil recovery device of a mist exhaust system of a stainless steel cold rolling mill with a simple structure and low cost, thereby solving the problem of poor rolling oil recovery effect.

[0004] To this end, the present invention provides a rolling oil recovery device for a demisting system of a stainless steel cold rolling mill, comprising a rolling oil collection tank for collecting the oil discharged from the oil return point in the demisting system, a water accumulation alarm separator and a water accumulation collection tank;

[0005] The rolling oil collecting tank includes a reflux zone and an adjacent sedimentation overflow zone, wherein the sedimentation overflow zone is connected to the top of the reflux zone, and when the rolling oil in the reflux zone is full, it overflows to the sedimentation overflow zone;

[0006] The bottom of the sedimentation overflow area is connected to the input end of the water accumulation alarm separator, and the output end of the water accumulation alarm separator is connected to the water accumulation collection tank.

[0007] Preferably, the rolling oil collecting tank is a closed box, and an oil return area isolation plate is provided in the closed box to divide the closed box into a left oil return area and a right oil return area. The top of the oil return area isolation plate is welded to the collecting tank top cover, the bottom end is spaced apart from the bottom of the closed box with a gap, and the side end is welded to the inner wall of the closed box;

[0008] The left oil return area is connected to the oil return point in the mist exhaust system, and the right oil return area is adjacent to the sedimentation overflow area.

[0009] Preferably, the rolling oil collecting tank is located in a pit beside the demisting system, and the rolling oil collecting tank is connected to the oil return point in the demisting system through an oil return pipe of the demisting system.

[0010] Preferably, a slope is provided at the bottom of the rolling oil collecting tank, and a discharge ball valve is provided at the lowest point of the slope.

[0011] Preferably, a moisture absorbing air filter is provided at the top of the rolling oil collecting tank.

[0012] Preferably, the device also includes a self-priming sewage pump and a backwash filter, the inlet of the self-priming sewage pump extends to the bottom of the sedimentation overflow area through a pipeline connection, the outlet is connected to the input end of the backwash filter, and the output end of the backwash filter is connected to the reflux area.

[0013] Preferably, a stop valve is provided on the pipeline connecting the self-priming sewage pump and the bottom of the sedimentation overflow area.

[0014] Preferably, a radar level meter is provided in the sedimentation overflow area.

[0015] Preferably, a solenoid valve is provided on the connecting pipe between the output end of the water accumulation alarm separator and the water accumulation collection tank, and the solenoid valve is electrically connected to the water accumulation alarm separator.

[0016] Preferably, a magnetic filter is provided at the upper end of the reflux zone.

[0017] Beneficial effects of the present invention: The rolling oil recovery device of the demisting system of the stainless steel cold rolling mill provided by the present invention comprises a rolling oil collection tank, a water accumulation alarm separator and a water accumulation collection tank for collecting the oil discharged from the oil return point in the demisting system; the rolling oil collection tank comprises a reflux area and an adjacent sedimentation overflow area, the sedimentation overflow area is connected to the top of the reflux area, and when the rolling oil in the reflux area is full, it overflows to the sedimentation overflow area; the bottom of the sedimentation overflow area is connected to the input end of the water accumulation alarm separator, and the output end of the water accumulation alarm separator is connected to the water accumulation collection tank. The oil discharged from the oil return points such as the air duct, oil mist, fan and chimney in the demisting system is collected, and the magnetic impurities, water, graded precipitation and filtered are pumped to the dirty oil tank of the rolling oil system, thereby reducing the consumption of rolling oil. In addition, the scheme makes the rolling oil discharged from the demisting system relatively clean after closed sedimentation filtration, and the burden of the filtering equipment is reduced after it is sent back to the rolling oil system, which is more convenient to implement and has obvious economic benefits.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1The present invention is a schematic diagram of the structural principle of a rolling oil recovery device of a mist exhaust system of a stainless steel cold rolling mill.

[0020] Explanation of the reference numerals: 1- radar level gauge, 2- stop valve, 3- self-priming sewage pump, 4- flexible joint; 5- magnetic filter, 6- backwash filter, 7- check valve, 8- water accumulation alarm separator, 9- solenoid valve; 10- rolling oil collection tank, 11- hygroscopic air filter, 12- discharge ball valve, 13- water accumulation collection tank, 14- oil return area partition, 15- sedimentation overflow area partition. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0024] The embodiment of the present invention provides a rolling oil recovery device for a demisting system of a stainless steel cold rolling mill, comprising a rolling oil collection tank 10, a water accumulation alarm separator 8 and a water accumulation collection tank 13 for collecting the oil discharged from the oil return point in the demisting system; the rolling oil collection tank 10 comprises a reflux area and an adjacent sedimentation overflow area, the sedimentation overflow area is connected to the top of the reflux area, and when the rolling oil in the reflux area is full, it overflows to the sedimentation overflow area; the bottom of the sedimentation overflow area is connected to the input end of the water accumulation alarm separator 8, and the output end of the water accumulation alarm separator 8 is connected to the water accumulation collection tank 13. The oil discharged from the oil return points such as the air duct, oil mist, fan and chimney in the demisting system is collected, and the magnetic impurities, water, graded sedimentation and filtered are pumped to the dirty oil tank of the rolling oil system, thereby reducing the consumption of rolling oil. In addition, the scheme makes the rolling oil discharged from the demisting system relatively clean after closed sedimentation filtration, and reduces the burden of the filtering equipment after being sent back to the rolling oil system, which is convenient to implement and has obvious economic benefits.

[0025] In a preferred solution, the rolling oil collection tank 10 is a closed box, and an oil return area partition plate is provided in the closed box to divide the closed box into a left oil return area and a right oil return area. The top of the oil return area partition plate is welded to the top cover of the collection tank, the bottom end is spaced apart from the bottom of the closed box, and the side end is welded to the inner wall of the closed box; the left oil return area is connected to the oil return point in the demisting system, and the right oil return area is adjacent to the sedimentation overflow area. The bottoms of the two oil return areas are connected, and the first filtration and sedimentation are performed in the left oil return area, and then the sedimentation and filtration are performed in the right oil return area, and finally the overflowed oil enters the sedimentation area.

[0026] In a preferred solution, the rolling oil collecting tank 10 is located in a pit beside the demisting system, and the rolling oil collecting tank 10 is connected to the oil return point in the demisting system through an oil return pipe of the demisting system.

[0027] In a preferred solution, a slope is provided at the bottom of the rolling oil collecting tank 10, and a discharge ball valve 12 is provided at the lowest point of the slope. The slope plays a role in better filtering slag.

[0028] In a preferred embodiment, a moisture absorbing air filter 11 is provided at the top of the rolling oil collecting tank 10. The moisture absorbing air filter 11 is provided in the reflux zone to remove moisture.

[0029] In a preferred embodiment, the device further comprises a self-priming sewage pump 3 and a backwash filter 6. The inlet of the self-priming sewage pump 3 is connected to the bottom of the sedimentation overflow area through a pipeline, and the outlet is connected to the input end of the backwash filter 6. The output end of the backwash filter 6 is connected to the reflux area. When the radar level meter 1 detects a high level signal of the oil in the recovery area, the self-priming sewage pump will be started, and the oil will be filtered through the backwash filter 6 and then sent back to the rolling oil tank. After the backwash filter 6 has filtered for a period of time, the filter element inlet and outlet differential pressure reaches the set value and then automatically backwashes, and the backwash discharge pipe is connected back to the reflux area of ​​the rolling oil collection tank 10 to continue sedimentation.

[0030] In a preferred solution, a stop valve 2 is provided on the pipeline connecting the self-priming sewage pump 3 with the bottom of the sedimentation overflow area.

[0031] like Figure 1 As shown below, Figure 1 To describe the principle of the whole device:

[0032] A rolling oil recovery device of a stainless steel cold rolling mill mist exhaust system comprises a rolling oil collection tank, a water accumulation alarm separation pipeline and a filtering reflux pipeline.

[0033] The rolling oil collecting tank 10 is a closed box to prevent external impurities and water from mixing into the rolling oil. The inside of the collecting tank is divided into three parts: a reflux area, a sedimentation overflow area, and a recovery area by a welded partition. The collecting tank collects the oil discharged from the oil return points such as the air duct, oil mist device, fan and chimney in the demisting system, and is generally arranged in a pit next to the demisting system.

[0034] The reflux zone is provided with a hygroscopic air filter 11 to remove moisture, and a magnetic filter 5 to absorb magnetic impurities in the reflux oil. The upper part and both sides of the oil return zone baffle 14 are welded to the top cover of the collecting tank 10 and the side of the box body, and the lower part is about 500mm away from the bottom of the box body. Impurities in the oil are deposited at the bottom of the reflux zone as much as possible through sedimentation. At regular intervals, the oil can be drained first through the discharge ball valve 12 at the bottom of the reflux zone, and then the cleaning cover of the collecting tank is opened to clean the sludge at the bottom of the reflux zone.

[0035] The bottom of the sedimentation overflow area is a bottom surface inclined toward the reflux area, and a hygroscopic air filter 11 is provided to remove moisture, and the lower part and both sides of the sedimentation overflow area partition 15 are welded to the bottom plate of the collecting tank and the side of the box body, and the upper part is about 500mm away from the top of the box body; after sedimentation, the relatively clean oil reaches the height of the sedimentation overflow area partition 15 and overflows to the recovery area.

[0036] The recovery area is provided with a radar level meter 1, a water accumulation alarm separator 8 and a discharge ball valve 12, and a solenoid valve 9 is provided on the pipeline of the water accumulation alarm separator 8. When the water content in the oil reaches the alarm value, the solenoid valve will automatically open to discharge the accumulated water into the water collection tank 13.

[0037] The filtering return pipeline is provided with a self-priming sewage pump 3, a backwashing filter 6 (filtration accuracy ~ 100um) and a stop valve 2, a flexible joint 4, a check valve 7 and other valves. When the radar level meter 1 detects a high liquid level signal of the oil in the recovery area, the self-priming sewage pump 3 will be started, and the oil will be filtered through the backwashing filter 6 and then sent back to the rolling oil tank. After the backwashing filter 6 has filtered for a period of time, the filter element inlet and outlet differential pressure will reach the set value and automatic backwashing will be performed, and the backwashing discharge pipe will be connected back to the reflux area of ​​the rolling oil collection tank for continued sedimentation.

[0038] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A rolling oil recovery device for a stainless steel cold rolling mill mist exhaust system, characterized in that: It includes a rolling oil collecting tank, a water accumulation alarm separator and a water accumulation collecting tank for collecting the oil discharged from the oil return point in the demisting system; the rolling oil collecting tank includes a reflux area and an adjacent sedimentation overflow area, the sedimentation overflow area is communicated with the top of the reflux area, when the rolling oil in the reflux area is full, the relatively clean oil after sedimentation overflows to the sedimentation overflow area; the bottom of the sedimentation overflow area is connected to the input end of the water accumulation alarm separator, and the output end of the water accumulation alarm separator is connected to the water accumulation collecting tank; the rolling oil collecting tank is a closed box to prevent external impurities and water from mixing into the rolling oil, and an oil return area isolation plate that divides the reflux area into a left oil return area and a right oil return area is provided in the closed box, the top of the oil return area isolation plate is welded to the rolling oil collecting tank top cover, the bottom end is gapped with the bottom of the closed box, and the side end is welded to the inner wall of the closed box; the left oil return area is connected to the oil return point in the demisting system The right oil return area is adjacent to the sedimentation overflow area; the bottoms of the two oil return areas are connected, the first filtration and sedimentation are carried out in the left oil return area, and then the sedimentation and filtration are carried out in the right oil return area, and finally the overflowed oil enters the sedimentation overflow area; the device also includes a filtration return pipeline, and a self-priming sewage pump and a backwashing filter are arranged on the filtration return pipeline. The inlet of the self-priming sewage pump is extended to the bottom of the sedimentation overflow area through a pipeline connection, and the outlet is connected to the input end of the backwashing filter, and the output end of the backwashing filter is connected to the reflux area; a radar level gauge is arranged in the sedimentation overflow area; when the radar level gauge detects a high liquid level signal of the oil in the sedimentation overflow area, the self-priming sewage pump will be started, and the oil will be filtered through the backwashing filter and then sent back to the rolling oil tank. After the backwashing filter has filtered for a period of time, the differential pressure of the filter element inlet and outlet reaches the set value, and automatic backwashing will be carried out, and the backwashing discharge pipe will be connected back to the reflux area of ​​the rolling oil collection tank for continued sedimentation.

2. The rolling oil recovery device of the stainless steel cold rolling mill mist exhaust system according to claim 1 is characterized by: The rolling oil collecting tank is located in a pit beside the demisting system, and the rolling oil collecting tank is connected to the oil return point in the demisting system through the demisting system oil return pipe.

3. The rolling oil recovery device of the mist exhaust system of a stainless steel cold rolling mill according to claim 1, characterized in that: A slope is arranged at the bottom of the reflow zone, and a discharge ball valve is arranged at the lowest point of the slope.

4. The rolling oil recovery device of the mist exhaust system of a stainless steel cold rolling mill according to claim 1, characterized in that: A moisture absorbing air filter is arranged at the top of the recirculation zone.

5. The rolling oil recovery device of the mist exhaust system of a stainless steel cold rolling mill according to claim 1, characterized in that: A stop valve is provided on the pipeline connecting the self-priming sewage pump and the bottom of the sedimentation overflow area.

6. The rolling oil recovery device of the mist exhaust system of a stainless steel cold rolling mill according to claim 1, characterized in that: A solenoid valve is provided on a connecting pipe between the output end of the water accumulation alarm separator and the water accumulation collection tank, and the solenoid valve is electrically connected to the water accumulation alarm separator.

7. The rolling oil recovery device of the mist exhaust system of a stainless steel cold rolling mill according to claim 1, characterized in that: A magnetic filter is provided at the upper end of the reflux zone.

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