Steam heat exchange device for rolling oil recovery, pipeline of steam heat exchange device and rolling oil recovery device
By setting up waterproof hammer equipment in the pipeline of the steam heat exchange device, the problem of water hammer phenomenon in the steam pipeline is solved, ensuring the normal operation and service life of the equipment.
Patent Information
- Application Number
- CN202421423726.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-06-20
AI Technical Summary
In the existing oil mist recovery system, steam pipes are prone to water hammering, which affects the normal operation of the equipment.
A steam heat exchange device for rolling oil recovery and its pipelines are designed, including steam pipes and waterproof hammer equipment. By setting up valves at the entrances and exits of the heat exchange branch and setting up waterproof hammer equipment on the heat exchange branch, the water hammer phenomenon can be effectively reduced.
It effectively reduces the water hammer phenomenon, reduces the impact on the pipe wall of the heat exchange branch, ensures the normal progress of heating work, reduces the number of failures, and extends the service life of the equipment.
Smart Images
Figure CN222799757U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of metal rolling, and in particular to a steam heat exchange device for recovering rolling oil, a pipeline thereof, and a rolling oil recovery device. Background Art
[0002] The aluminum foil rolling process generates heat due to metal deformation. To remove this heat and provide proper lubrication, rolling oil is used as a lubricant and coolant. Due to this heat, the rolling oil is partially atomized, forming droplets of varying sizes that hang above the rolls, commonly known as rolling oil mist. In engineering, oil droplets larger than 5μm are typically referred to as liquid oil mist, while those smaller than 5μm are referred to as gaseous oil mist. Oil mist can have serious impacts on the environment and human health, making its management a significant challenge in the production process. Currently, the traditional approach is to install exhaust hoods above the rolling mill to collect and remove rolling oil mist, improving the working environment and preventing fire hazards. Alternatively, an oil mist recovery system is installed to recover rolling oil from the rolling oil mist for reuse.
[0003] Existing oil mist recovery systems operate primarily in two stages: absorption and desorption. Absorption involves dissolving and absorbing rolling oil mist in the flue gas through an absorbent, while desorption involves separating the oil dissolved in the absorbent from the absorbent through vacuum distillation. The desorption tower used in the desorption process requires heat. Using steam as a heat source for heat exchange can easily cause water hammer in the steam pipeline, impacting equipment performance.
[0004] Therefore, how to reduce the impact of steam pipe water hammer on the heat exchange device and ensure the normal operation of the equipment has become an urgent problem to be solved by those skilled in the art. Utility Model Content
[0005] In order to reduce the impact of water hammer in steam pipes on heat exchange devices and ensure the normal operation of equipment, the present application proposes a steam heat exchange device for rolling oil recovery, its pipeline, and rolling oil recovery device.
[0006] In order to achieve the purpose of the utility model, a pipeline of a steam heat exchange device for rolling oil recovery is provided, comprising:
[0007] Steam piping and water hammer protection equipment;
[0008] The inlet and outlet of the steam pipe are suitable for connecting to a steam supply device for circulating steam in the steam pipe, and a first temperature sensor is provided at the inlet of the steam pipe;
[0009] The steam pipeline is provided with a heat exchange branch, which is connected to the steam pipeline. The heat exchange branch is provided with a first valve, a water hammer prevention device and a heat exchanger. The inlet and outlet of the heat exchange branch are both provided with a first valve. The inlet and outlet of the heat supply part of the heat exchanger are connected to the heat exchange branch, and the outlet of the heat receiving part of the heat exchanger is provided with a second temperature sensor.
[0010] According to another aspect of the present application, a steam heat exchange device for rolling oil recovery is provided, comprising the pipeline of the aforementioned steam heat exchange device for rolling oil recovery.
[0011] According to another aspect of the present application, a rolling oil recovery device is provided, comprising the aforementioned steam heat exchange device for rolling oil recovery.
[0012] This application can effectively reduce and eliminate the water hammer phenomenon in the heat exchange branch, reduce the impact on the heat exchange branch pipe wall, ensure the normal operation of this heating work, reduce the number of failures, and extend the service life of the steam heat exchange device and its pipelines. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 A schematic structural diagram of a steam heat exchange device for rolling oil recovery according to an embodiment of the present application is shown;
[0014] Figure 2 A schematic diagram showing the structure of the pipeline of the steam heat exchange device for rolling oil recovery according to an embodiment of the present application;
[0015] Figure 3 A schematic structural diagram of a steam heat exchange device for rolling oil recovery according to an embodiment of the present application is shown;
[0016] Figure 4 A schematic diagram showing the structure of the pipeline of the steam heat exchange device for rolling oil recovery in an embodiment of the present application.
[0017] Steam supply device 100, steam pipe 200, first temperature sensor 210, third temperature sensor 220, third valve 230, inlet 240 of the steam pipe, outlet 250 of the steam pipe, heat exchange branch 300, first valve 310, second valve 320, anti-water hammer device 330, opening 331, heat exchanger 340, inlet 341 of the heat receiving part, outlet 342 of the heat receiving part, second temperature sensor 343, fourth temperature sensor 344, pressure sensor 350. DETAILED DESCRIPTION
[0018] 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 indicated.
[0019] It should be understood that the terms "length", "width", "height", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0020] In addition, in order to better illustrate the present application, numerous specific details are provided in the following detailed description. Those skilled in the art will understand that the present application can be practiced without certain specific details. In some instances, methods and means well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.
[0021] According to one aspect of the present application, a pipeline of a steam heat exchange device for rolling oil recovery is provided, including a steam pipe 200 and a water hammer prevention device 330 .
[0022] The inlet and outlet 250 and 240 of the steam pipe 200 are adapted to be connected to the steam supply device 100 for circulating steam within the steam pipe 200. A first temperature sensor 210 is provided at the inlet of the steam pipe 200 to detect the incoming steam temperature and prevent the steam supply device 100 from malfunctioning, resulting in insufficient steam temperature or no steam being introduced, which could lead to poor heating effect or idling of the heat exchange device.
[0023] The steam pipe 200 is provided with a heat exchange branch 300, which is connected to the steam pipe 200. The heat exchange branch 300 is provided with a first valve 310, a water hammer prevention device 330 and a heat exchanger 340. The inlet and outlet of the heat exchange branch 300 are both provided with a first valve 310 to control the connection state (open / closed) between the heat exchange branch 300 and the steam pipe 200, thereby controlling whether steam flows inside the heat exchange branch 300 for heat exchange, providing heat for the desorption tower, and recovering rolling oil.
[0024] The heat supply inlet and outlet of the heat exchanger 340 are connected to the heat exchange branch 300. The outlet 342 of the heat receiving portion of the heat exchanger 340 is equipped with a second temperature sensor 343 to detect and confirm whether the heat receiving portion is receiving heat energy. If the first temperature sensor 210 detects an abnormality, it is determined that the external steam supply device 100 has a fault. If the measurement result of the first temperature sensor 210 is within the normal range, but the detection result of the second temperature sensor 343 is abnormal, it is the pipeline of the steam heat exchange device for rolling oil recovery provided by this application. Based on this, targeted maintenance and adjustments can be made to each component. Furthermore, there are more than two heat exchange branches 300, and the two or more heat exchange branches 300 are all connected to the steam pipeline 200. By increasing the number of heat exchange branches 300, one steam supply device 100 can supply heat to multiple desorption towers. In addition, based on the detection results of each second temperature sensor 343 on each heat exchange branch 300, it can be determined whether the fault is located in a specific heat exchange branch 300 or in the commonly connected steam pipeline 200, so that targeted maintenance and adjustments can be made.
[0025] The present application sets a steam pipe 200, sets a heat exchange branch 300 (pipeline) in the steam pipe 200, sets a heat exchanger 340 in the heat exchange branch 300, and connects the heat supply part to the heat exchange branch 300, and connects the heat receiving part to the desorption tower, and uses hot steam to supply heat to the desorption tower. By setting valves at the inlet and outlet of the heat exchange branch 300, the heating work can be started / stopped. By setting an anti-water hammer device 330 on the heat exchange branch 300, the water hammer device 330 is also called a water hammer eliminator, which can effectively reduce and eliminate the water hammer phenomenon of the heat exchange branch 300, reduce the impact on the pipe wall of the heat branch, ensure the normal operation of this heating work, reduce the number of failures, and extend the service life of the steam heat exchange device and its pipelines.
[0026] It should be noted that the water hammer phenomenon refers to the situation where a sudden power outage or rapid opening and closing of valves occurs, and the inertia of the pressurized steam flow / condensate flow generates shock waves on the pipe wall, just like a hammer hitting it, so it is called water hammer. The force generated by the shock wave back and forth is sometimes very large and can damage valves and drive pumps. This application does not specifically limit the position of the drive pump that drives the steam / condensate to circulate in the pipeline. It can be installed in the public connection area of the steam pipeline, or it can be connected to the external steam supply device 100, or it can be provided by the steam supply device 100. As long as hot steam can flow in from the inlet of the steam pipe 200 and flow out from the outlet of the steam pipe 200 after heat supply, it can be sufficient. See the flow direction. Figure 1 As indicated by the arrow.
[0027] It should be noted that this application does not impose specific limitations on the structure of the anti-water hammer device 330, as long as it can reduce and eliminate water hammer phenomena in the heat exchange branch 300. For example, the inlet and outlet of the anti-water hammer device 330 are connected to the steam pipe 200, and the steam in the steam pipe 200 circulates through the anti-water hammer device 330. The anti-water hammer device 330 is internally provided with a circulation cavity, through which the steam at the inlet can re-enter the steam pipe 200 at the outlet. The anti-water hammer device 330 has a piston on the side wall of the circulation cavity, which is slidably connected to the side wall of the circulation cavity. The piston is also provided with an elastic member connected to the side wall of the circulation cavity. Water pressure drives the piston to move along the side wall of the circulation cavity. The elastic member resets and retracts when the water pressure decreases, thereby adjusting the size of the circulation cavity according to the impact force of the shock wave, flexibly adapting to changes in steam and water flow, and reducing water hammer shock waves. An opening 331 is provided on the side wall of the circulation chamber within the displacement area of the piston. If the shock wave is too large, the piston will move until the opening 331 is connected to the circulation chamber, thereby discharging excess steam / condensate, thereby reducing the shock wave and the damage and wear to the pipeline caused by the shock wave, ensuring the normal operation of the heating work, reducing the number of failures, and extending the service life of the steam heat exchange device and its pipelines.
[0028] In one possible implementation, for some anti-water hammer devices 330 whose operating status can be externally controlled and adjusted, such as anti-water hammer devices 330 whose piston sliding displacement degree can be externally controlled, it is preferred that one end of the piston along its sliding displacement direction passes through the side wall, and the opening 331 is located on the wide side of its sliding track body and is connected to the ditch toward the ground. The sliding degree is controlled by holding the protruding end to adjust the size of the flow cavity. The present application provides a pressure sensor 350 on the heat exchange branch 300 for detecting the internal pressure of the heat exchange branch 300 and adjusting the operating status of the anti-water hammer device 330 according to the pressure value. Furthermore, a driving device is provided at one end of the piston, and the driving device is suitable for externally controlling the sliding of the driving piston. The output end of the pressure sensor 350 / differential pressure gauge is electrically connected to the input end of the driving device for communication, and the sliding of the driving piston is controlled according to the pressure measurement result.
[0029] In one possible implementation, the heat exchange branch 300 is further provided with a second valve 320 for regulating the flow rate of the heat exchange branch 300. The second valve 320 is located between the two first valves 310 of the heat exchange branch 300. The anti-water hammer device 330 and the second valve 320 are adjacently arranged on the heat exchange branch 300. Furthermore, the anti-water hammer device 330 and the second valve 320 are both located between the inlet of the heat exchange branch 300 and the inlet of the heat supply unit of the heat exchanger 340.
[0030] In one possible implementation, pressure sensors 350 are provided on both sides of the second valve 320 along the steam flow direction to detect the pressure difference before and after the second valve 320 and adjust the operating state of the anti-water hammer device 330 accordingly.
[0031] In one possible implementation, a differential pressure gauge is further included. Both pressure measuring terminals of the differential pressure gauge are connected to the heat exchange branch 300. Specifically, they are connected to the pipelines in front and behind the second valve 320 along the steam flow direction. The second valve 320 is located between the two pressure measuring terminals of the differential pressure gauge. The differential pressure across the second valve 320 is detected and used to adjust the operating status of the anti-water hammer device 330 accordingly. The second valve 320 is preferably an electric valve equipped with a controller. The output of the differential pressure gauge / pressure sensor 350 is electrically connected to the input of the controller of the electric valve.
[0032] In a possible implementation, the inlet and outlet 250 and 240 of the steam pipe 200 are both provided with a third valve 230 , and the third valve 230 is used to control whether the steam pipe 200 is connected to the steam supply device 100 and adjust the flow rate of the connected steam.
[0033] In a possible implementation, the inlet and outlet of the heat supply part of the heat exchanger 340 are provided with flanges, and the heat exchange branch 300 is sealed and connected to the heat supply part through the flange to communicate with each other.
[0034] In a possible implementation, a third temperature sensor 220 is provided at the outlet of the steam pipe 200 , and a fourth temperature sensor 344 is provided at the inlet 341 of the heat receiving portion of the heat exchanger 340 .
[0035] A drive pump is installed in the common connection area / heat exchange branch 300 of the steam pipeline 200. The operating parameters of the drive pump are adjusted based on the inlet and outlet temperature difference between the steam pipeline 200 and the heat receiving portion, thereby regulating the circulation rate of steam / condensate and optimizing heat exchange efficiency. Furthermore, the first, second, third, and fourth temperature sensors 344 are all electrically connected to the input end of the drive pump for communication. The drive pump adjusts its speed based on the inlet and outlet temperature difference between the steam pipeline 200 and the heat receiving portion, thereby regulating the steam circulation rate within the steam pipeline 200.
[0036] In one possible implementation, each heat exchange branch 300 is equipped with two or more water hammer prevention devices 330, preferably two. One water hammer prevention device 330 is located adjacent to the third valve 230 at the inlet of the heat exchange branch 300 to regulate and eliminate water hammer shock waves caused by the heating steam flow; the other water hammer prevention device 330 is installed at the outlet of the heat exchange branch 300 to regulate and eliminate water hammer shock waves caused by the steam / condensate cooled after heat exchange.
[0037] In one possible implementation, the heating part of the heat exchanger 340 is in the shape of a pipe, and the hot steam will condense into liquid inside the pipe of the heat exchanger 340. During the condensation process, the bubbles of steam will decrease rapidly, causing the edges of the bubbles to collide, which will produce condensation water hammer. Reducing the shrinkage rate of the bubbles can effectively reduce and eliminate the water hammer phenomenon in the condensation area. Therefore, the present application provides an annular protrusion on the inner wall of the pipe of the heating part, so that the inner diameter of the pipe of the heating part first increases and then decreases along the direction of steam flow. A platform area parallel to the axial direction of the pipe is provided in the turning area where the inner diameter increases and decreases. That is, the cross-section of the pipe along the radial direction is circular, and the cross-section along the axial direction is two trapezoids set opposite to each other. The two angles at the bottom of the trapezoidal structure are as small as possible, ranging from 8 to 18 degrees. When hot steam enters the heating pipe, the inner diameter gradually shrinks. The size of the bubbles formed by the steam wrapped in the condensed liquid gradually decreases. Compared with the pipe with a constant inner diameter, the bubbles randomly collide with the side wall at the same time and shrink instantly. This application can reduce the shrinkage speed of the bubbles and shrink them at a uniform speed. It can suppress condensation water hammer and reduce the intensity of the water hammer shock wave. The height of the annular protrusion is always less than 1 / 3 of the diameter of the heating pipe. The condensate passes through the platform area and enters the flow area with a gradually increasing diameter.
[0038] According to another aspect of the present application, a steam heat exchange device for rolling oil recovery is provided, comprising a steam supply device 100 and pipelines of the aforementioned steam heat exchange device for rolling oil recovery.
[0039] According to another aspect of the present application, a rolling oil recovery device is provided, comprising a desorption tower and the aforementioned steam heat exchanger for rolling oil recovery. The desorption tower is suitable for vacuum distillation to collect the rolling oil absorbed by the absorbent, and the desorption tower can be a distillation tower or other equipment that requires heat and can perform vacuum distillation and desorption. The heated portion of the heat exchanger 340 is connected to the desorption tower and is used to supply heat for the desorption tower. It should be noted that the present application does not impose specific restrictions on the connection method between the heated portion and the desorption tower, nor does it impose specific restrictions on how the heated medium circulating inside the heated portion heats the material inside the desorption tower. As long as the heated portion of the heat exchanger 340 can be used to supply heat to the desorption tower, the steam heat exchanger for rolling oil recovery can be made the heat source of the desorption tower.
[0040] In one possible implementation, the oily fumes generated by metal rolling undergo a gas-to-liquid transition within an absorption tower. The resulting mixture of rolling oil and absorbent, after being absorbed by the absorbent, is then separated through vacuum distillation in a subsequent desorption system. This results in the oil being vaporized, condensed, and recovered, while the absorbent is then recycled back into the system. During the vaporization step, a steam heat exchanger heats the mixture of rolling oil and absorbent. The mixture then circulates within the heat receiving portion of the heat exchanger, exchanging heat with steam within the heat supply portion. The mixture is then passed into the desorption tower inlet for separation, condensation, and recovery.
[0041] In one possible implementation, the system also includes a fume hood and an absorption tower. The hood's inlet is located above the rolling mill to extract the oily fumes generated during the rolling process. The hood's outlet is connected to the absorption tower's inlet. The absorption tower contains an absorbent that absorbs the oil in the oily fumes. The absorbed oil is then fed into a desorption tower for vacuum distillation to desorb the oil, producing rolling oil. Furthermore, a condenser can be installed between the hood and the absorption tower to collect the easily condensable oil in the oily fumes, reducing the costs of absorption and desorption.
[0042] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.
Claims
1. A pipeline of a steam heat exchange device for rolling oil recovery, characterized in that: include: Steam piping and water hammer protection equipment; The inlet and outlet of the steam pipeline are suitable for connecting to a steam supply device for circulating steam in the steam pipeline, and a first temperature sensor is provided at the inlet of the steam pipeline; The steam pipeline is provided with a heat exchange branch, which is connected to the steam pipeline. The heat exchange branch is provided with a first valve, a water hammer prevention device and a heat exchanger. The inlet and outlet of the heat exchange branch are both provided with a first valve. The inlet and outlet of the heat supply part of the heat exchanger are connected to the heat exchange branch. The outlet of the heat receiving part of the heat exchanger is provided with a second temperature sensor.
2. The pipeline of the steam heat exchange device for rolling oil recovery according to claim 1 is characterized in that: The heat exchange branch is also provided with a pressure sensor.
3. The pipeline of the steam heat exchange device for rolling oil recovery according to claim 1 is characterized in that: There are more than two heat exchange branches, and the more than two heat exchange branches are connected to the steam pipeline.
4. The pipeline of the steam heat exchange device for rolling oil recovery according to claim 1 is characterized in that: The heat exchange branch is further provided with a second valve, which is located between the two first valves of the heat exchange branch, and the water hammer prevention device and the second valve are adjacently arranged on the heat exchange branch.
5. The pipeline of the steam heat exchange device for rolling oil recovery according to claim 4 is characterized in that: The second valve is an electric valve.
6. The pipeline of the steam heat exchange device for rolling oil recovery according to claim 1 is characterized in that: The inlet and outlet of the steam pipeline are both provided with a third valve.
7. The pipeline of the steam heat exchange device for rolling oil recovery according to claim 1 is characterized in that: The inlet and outlet of the heat supply part of the heat exchanger are provided with flanges, and the heat exchange branch is sealed and connected with the heat supply part through the flanges to communicate with each other.
8. A steam heat exchange device for rolling oil recovery, characterized in that: include: The pipeline of the steam heat exchange device for rolling oil recovery as described in any one of claims 1 to 7.
9. A rolling oil recovery device, characterized in that: include: The steam heat exchange device for rolling oil recovery as described in claim 8.