Device for recycling accumulated oil in pipeline of main engine lubricating oil smoke exhaust system

Abstract

The utility model relates to the technical field of waste oil collection and treatment, and particularly discloses a main engine lubricating oil smoke exhaust system pipeline accumulated oil recycling device which comprises an oil return structure connected to a drain valve below a U-shaped pipeline through a first pipeline. The oil return structure comprises an oil return tank, and an oil inlet is formed in the upper portion of the oil return tank and connected with the first pipeline. The oil return tank internally comprises a dirty oil area and a clean oil area; a weir plate is arranged between the dirty oil area and the clean oil area; a liquid level meter is arranged in the oil purification area and is arranged on the side wall of the oil return tank; an oil outlet is formed in the lower end of the oil purification area and is connected to a main engine oil purification device through a second pipeline. The U-shaped pipe discharge valve is connected with the return oil treatment device, through three-stage treatment of sedimentation of the dirty oil area, primary filtration of the clean oil area and fine filtration of the main machine, and in cooperation with regular pollution discharge, efficient recovery and cyclic utilization of lubricating oil are achieved, the oil quality is remarkably improved, and the operation cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of waste oil recycling and treatment technology, specifically to a device for recycling and reusing oil accumulated in the pipeline of a main engine lubricating oil exhaust system. Background Technology

[0002] During the operation of a power plant's steam turbine generator unit, the main engine lubrication system needs to maintain a stable, slightly negative pressure environment to facilitate normal equipment operation, ensure accurate oil level monitoring in the lubrication tank, and simultaneously discharge high-temperature oil mist generated by the high-speed operation of the equipment, preventing safety hazards caused by oil mist accumulation. Therefore, traditional exhaust systems typically use exhaust fans directly connected to the lubrication tank via pipes, discharging the oil mist above the main turbine building through these pipes.

[0003] However, in actual operation, due to space constraints and pipeline layout requirements, exhaust outlet pipes are often designed to be long with numerous bends, resulting in significant oil accumulation at U-bends. As operating time increases, the oil accumulation problem worsens, forcing maintenance personnel to perform frequent venting operations. This not only increases workload but also prevents the reuse of discharged lubricating oil due to contamination, particles, and excessive moisture, leading to resource waste and a significant increase in production costs.

[0004] Secondly, oil accumulation further affects the system's operating efficiency. Oil mist deposition in the pipes increases flow resistance, reducing the negative pressure regulation capability of the exhaust fan and potentially causing poor oil mist discharge. In this situation, the slightly negative pressure environment inside the oil tank is difficult to maintain stably, increasing oil level observation errors and, in severe cases, causing oil level fluctuations that threaten the safe operation of the unit.

[0005] More importantly, the design of traditional flue gas systems not only increases operation and maintenance costs, but also requires specialized processes and equipment for waste oil treatment, further exacerbating operating costs. Furthermore, frequent maintenance operations can disrupt the normal operation of the unit, affecting the overall efficiency of the power plant. Utility Model Content

[0006] The present invention aims to provide a device for recycling and reusing oil accumulated in the pipeline of the main engine lubricating oil exhaust system, so as to solve the problems of serious oil mist deposition at the U-shaped pipe of the existing power plant exhaust system, frequent processing increasing the workload, and the inability to recycle waste oil, which increases production costs and affects production efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This utility model provides a device for recycling and reusing accumulated oil in the pipeline of a main engine lubricating oil exhaust system. By connecting the U-shaped pipe exhaust valve to the oil return treatment device, the accumulated oil passes through the built-in sludge zone for impurity sedimentation before entering the clean oil zone. The oil in the clean oil zone passes through a filter screen and enters the main engine lubricating oil purification device built into the main engine lubricating oil system, thereby realizing the recycling and reuse of waste oil, reducing the amount of waste oil generated, solving the problem of oil accumulation at the U-shaped pipe, greatly reducing production costs and maintenance frequency, and reducing manpower burden. Specifically, this invention provides a device for recovering and reusing oil accumulated in the pipeline of a main engine lubricating oil exhaust system. The device includes an oil return structure connected to a discharge valve below a U-shaped pipe via a first pipeline. The oil return structure includes an oil return tank with an oil inlet at its top, connected to the first pipeline. The oil return tank includes a sludge zone and a clean oil zone. A weir plate is provided between the sludge zone and the clean oil zone. A level gauge is installed in the clean oil zone, located on the side wall of the oil return tank. An oil outlet is located at the lower end of the clean oil zone, connected to a main engine oil purification device via a second pipeline.

[0009] The principles and advantages of this scheme are:

[0010] This solution, within the constraints of limited space and meeting pipeline layout requirements, constructs a complete oil mist recovery and purification system by adding an oil return treatment device after the U-shaped drain valve. Accumulated oil first enters the sludge zone of the oil return treatment device, where impurities undergo natural sedimentation and separation. Subsequently, the oil flows into the clean oil zone, undergoes preliminary filtration via a primary filter, and is then transported through pipelines to the fine purification device integrated into the main unit's lubrication oil system for further treatment. A drain valve at the bottom of the sludge zone allows for the periodic discharge of deposited contaminants. After multi-stage purification, the lubricating oil ultimately meets reuse standards and is recycled back into the lubrication system.

[0011] The advantages of this solution are as follows: it achieves tiered treatment and resource utilization of waste oil. By establishing a three-stage treatment process—from a sludge zone to a clean oil zone to fine filtration—it ensures oil purification while fully utilizing the efficiency of existing main engine oil purification devices. Secondly, through the synergistic effect of regular sewage discharge and tiered filtration, it effectively solves the problems of oil accumulation and waste oil disposal in traditional exhaust systems, significantly reducing the frequency of waste oil treatment and effectively lowering lubricant replenishment costs. More importantly, this solution achieves closed-loop operation of the oil mist emission system without requiring large-scale modifications to the existing system, improving environmental benefits, enhancing the operational stability of the entire lubricant system, and reducing labor and production costs.

[0012] Furthermore, a filter screen is installed on the second pipeline. The filter screen is used to further filter the oil, thereby improving the oil filtration efficiency.

[0013] Furthermore, a breather valve is also provided at the upper end of the clean oil zone.

[0014] Furthermore, the weir plate has a height of 300-550mm and a thickness of 3-4mm. By setting a more suitable height and thickness, the weir plate can play a role in blocking and guiding the flow, effectively stabilizing the oil flow, reducing the disturbance of air bubbles and impurities, while having a simple and reliable structure, extending the service life of the oil and improving the stability of the system.

[0015] Furthermore, a drain valve is provided at the bottom of the return oil tank; the drain valve is located below the sludge oil area.

[0016] Furthermore, the ratio of the sludge zone to the clean zone is 1:1.

[0017] Furthermore, the return oil tank is a square box with a length of 700-750mm, a width of 500-550mm, and a height of 700-750mm.

[0018] Furthermore, isolation valves are provided at both ends of the filter screen. These valves can effectively cut off the flow of oil, preventing large-scale oil leakage from the system when replacing or cleaning the filter screen. They can also prevent unfiltered contaminants from entering the downstream system, avoid pressure shocks that could damage the filter screen, extend the filter screen's lifespan, and reduce sudden malfunctions.

[0019] Furthermore, the oil return tank is made of 304 stainless steel.

[0020] Furthermore, a drain valve is provided below the drain door. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 for Figure 1 Enlarged view of the partial structure of part A in the middle.

[0023] The markings in the accompanying drawings include: 1. Drain valve, 2. Main engine lubricating oil tank, 3. Oil return structure, 4. First pipeline, 5. Filter screen, 6. Main engine oil purification device, 7. Second pipeline, 301. Oil return tank, 302. Oil inlet, 303. Breathing valve, 304. Sludge zone, 305. Clean oil zone, 306. Level gauge, 307. Weir plate, 308. Drain gate, 309. Drain valve, 310. Oil outlet. Detailed Implementation

[0024] The following detailed description illustrates the specific implementation method:

[0025] Example 1

[0026] This embodiment is basically as shown in the appendix. Figure 1As shown: A device for recovering and reusing accumulated oil in the pipeline of a main engine lubricating oil exhaust system. This device forms an oil mist recovery and purification system by adding an oil return treatment device after the U-shaped exhaust valve. Accumulated oil first enters the sludge zone of the device for natural sedimentation and separation of impurities. It then flows into the clean oil zone for pre-treatment via a primary filter, and is subsequently transported to the fine purification device integrated into the main engine lubricating oil system for further treatment. The lubricating oil, after multi-stage purification, meets the reuse standards and can be recycled back into the lubrication system. Without altering the original exhaust system layout and meeting pipeline arrangement requirements, this device achieves tiered treatment and resource utilization of waste oil. It solves the problem of oil accumulation pollution in traditional exhaust systems while ensuring oil quality, significantly reducing operating costs and improving the system's environmental friendliness and stability.

[0027] As attached Figure 1 As shown, this embodiment includes a main engine lubricating oil tank 2 installed in a power plant turbine generator set. The exhaust system of the main engine lubricating oil tank 2 is equipped with an exhaust pipe, which includes the following components: Figure 1 The U-shaped pipe shown is connected to the discharge valve 1 below the U-shaped pipe via the first pipe 4. In this embodiment, the recycling device includes an oil return structure 3, which includes an oil return tank 301. The oil return tank 301 is a square box with a length of 700-750mm, a width of 500-550mm, and a height of 700-750mm. In this embodiment, the oil return tank 301 is made of 304 stainless steel, eliminating the need for an anti-rust coating, avoiding oil contamination, and making it more environmentally friendly and safe. It is also resistant to water vapor, acid and alkali corrosion, and oil corrosion, making it suitable for harsh environments and extending its service life.

[0028] Combined with appendix Figure 2 As shown, an oil inlet 302 is provided on the upper right side of the return oil tank 301. The oil inlet 302 is connected to the first pipeline 4, so that the oil accumulated at the bottom of the U-shaped pipe can be discharged into the return oil tank 301 in a timely manner along the first pipeline 4 through the oil inlet 302. A control valve is installed above the oil inlet 302 to control the frequency of collecting sludge and prevent sludge from accumulating.

[0029] In this embodiment, the return oil tank 301 includes a sludge zone 304 and a clean oil zone 305, with a 1:1 ratio between the sludge zone 304 and the clean oil zone 305. In this embodiment, a weir plate 307 is installed between the sludge zone 304 and the clean oil zone 305, dividing the return oil tank 301 into two spaces. In this embodiment, the weir plate 307 has a height of 300-550 mm and a thickness of 3-4 mm. After entering the return oil tank 301, the accumulated oil first undergoes impurity deposition in the sludge zone 304, with heavy contaminants (such as moisture and particles) deposited at the bottom. Clean oil will be at the top, and when it reaches a certain height, it will overflow the weir plate 307 and flow into the clean oil zone 305. The weir plate 307 achieves dynamic separation of sludge settling and clean oil diversion, while the drain valve periodically removes sludge, significantly improving oil recovery efficiency. Its simple structure and small footprint effectively enhance the efficiency of sludge purification.

[0030] A drain valve 308 is also provided at the bottom of the return oil tank 301, which is located below the sludge oil area 304. A drain valve 309 is installed below the drain valve 308. The drain valve 309 periodically controls the flow of the drain valve 308, thereby cooperating to complete the discharge of heavy pollutants in the sludge oil area 304 and realizing periodic sewage treatment.

[0031] A level gauge 306 is installed in the clean oil zone 305 and is fixedly mounted on the side wall of the return oil tank 301. The clean oil flowing in through the weir plate 307 is monitored by the level gauge 306. When a certain amount is reached, it is sent to the main engine oil purification device 6.

[0032] In this embodiment, a breather valve 303 is installed at the upper end of the clean oil zone 305. An oil outlet 310 is provided at the lower end of the clean oil zone 305. By controlling the breather valve 303, the pressure difference inside and outside the tank is balanced, preventing media evaporation or external contamination, thus saving material costs and reducing environmental pollution. (See attached...) Figure 1 As shown, the oil outlet 310 is connected to the main engine oil purification device 6 via the second pipeline 7. By controlling the oil outlet 310, the clean oil initially filtered in the clean oil zone 305 is transported to the main engine oil purification device 6. A filter screen 5 is installed on the second pipeline 7, and isolation valves are provided at both ends of the filter screen 5. After further filtration through the filter screen 5, the clean oil is sent to the main engine lubrication oil system's built-in main engine oil purification device 6, where it undergoes more refined filtration, thus meeting the standard for reuse.

[0033] Specific implementation process:

[0034] As attached Figure 1 To be continued Figure 2As shown, when there is oil accumulation at the U-bend, the control valve is opened to send the oil accumulation at the U-bend into the sludge zone 304 of the return oil tank 301 through the first pipeline 4. Impurities are deposited in the sludge zone 304, and after being filtered by the weir plate 307, the preliminarily filtered clean oil flows over the weir plate 307 into the clean oil zone 305, while heavy contaminants remain in the sludge zone 304.

[0035] The clean oil in the clean oil zone 305 is observed through the level gauge 306. When the clean oil reaches a certain volume, it is sent to the second pipe 7 through the oil outlet 310. In the second pipe 7, it is further filtered through a filter screen and then sent to the main engine oil purification device 6 for more refined filtration, so that the waste oil can meet the reuse standard after treatment and achieve recycling. At the same time, heavy pollutants in the sludge oil zone 304 are periodically discharged through the drain gate 308 to avoid secondary pollution.

[0036] In this embodiment, without altering the existing exhaust system and while meeting piping layout requirements, a return oil treatment device is connected via a pipeline after the U-shaped exhaust valve to guide accumulated oil into the device. This device employs a zoned treatment design: first, oil containing impurities enters the sludge zone, where gravity settling achieves initial impurity separation; subsequently, the pre-purified oil overflows into the clean oil zone, where it undergoes pre-filtration via a primary filter installed in the pipeline. The pre-filtered oil is then transported to the main engine lubrication system's main engine oil purification device, undergoing multi-stage precision filtration to ultimately meet reusable oil standards. Simultaneously, a drain valve is installed at the bottom of the sludge zone to periodically discharge deposited sludge and impurities, ensuring continuous and stable operation of the device.

[0037] Through the synergistic effect of zoned treatment and multi-stage filtration, the quality of oil purification is significantly improved. Secondly, by making full use of existing main purification units, the treatment effect is guaranteed while avoiding redundant investment in equipment. Finally, the regular drainage design effectively solves the problem of oil accumulation and pollution in traditional systems, significantly reducing waste oil treatment costs. The entire device forms a complete closed loop of oil recovery-purification-reuse, which not only improves resource utilization but also enhances the reliability of system operation.

[0038] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A device for recovering and reusing oil accumulated in the pipeline of a main engine lubricating oil exhaust system, characterized in that: The system includes an oil return structure connected to a discharge valve below a U-shaped pipe via a first pipeline; the oil return structure includes an oil return tank with an oil inlet at the top, which is connected to the first pipeline; the oil return tank includes a sludge zone and a clean oil zone; a weir plate is provided between the sludge zone and the clean oil zone; a level gauge is provided in the clean oil zone, located on the side wall of the oil return tank; and an oil outlet is provided at the lower end of the clean oil zone, which is connected to a main engine oil purification device via a second pipeline.

2. The device for recovering and reusing oil accumulated in the pipeline of a main engine lubricating oil exhaust system according to claim 1, characterized in that: A filter screen is installed on the second pipeline.

3. The device for recovering and reusing oil accumulated in the pipeline of a main engine lubricating oil exhaust system according to claim 1, characterized in that: A breather valve is also provided at the upper end of the clean oil zone.

4. The device for recovering and reusing oil accumulated in the pipeline of the main engine lubricating oil exhaust system according to claim 1, characterized in that: The weir plate has a height of 300-550mm and a thickness of 3-4mm.

5. The device for recovering and reusing oil accumulated in the pipeline of a main engine lubricating oil exhaust system according to claim 1, characterized in that: A drain valve is also provided at the bottom of the return oil tank; the drain valve is located below the sludge oil area.

6. The device for recovering and reusing oil accumulated in the pipeline of a main engine lubricating oil exhaust system according to claim 1, characterized in that: The ratio of the sludge zone to the clean zone is 1:

1.

7. The device for recovering and reusing oil accumulated in the pipeline of a main engine lubricating oil exhaust system according to claim 1, characterized in that: The return oil tank is a square box with a length of 700-750mm, a width of 500-550mm, and a height of 700-750mm.

8. The device for recovering and reusing oil accumulated in the pipeline of a main engine lubricating oil exhaust system according to claim 2, characterized in that: The filter screen is also equipped with isolation valves at both ends.

9. The device for recovering and reusing oil accumulated in the pipeline of a main engine lubricating oil exhaust system according to claim 1, characterized in that: The return oil tank is made of 304 stainless steel.

10. A device for recovering and reusing oil accumulated in the pipeline of a main engine lubricating oil exhaust system according to claim 5, characterized in that: A drain valve is provided below the drain gate.

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