A system for recovering used oil

Abstract

The utility model provides a kind of dirty oil recovery system, including injection pipeline, buffer tank, recovery pipeline and transport pipeline, injection pipeline includes parallel injection branch and power branch, buffer tank has injection port, input and first discharge port, buffer tank is communicated with injection branch by injection port, first control valve is provided on injection branch, recovery pipeline is communicated with the input of buffer tank, transport pipeline is communicated with the first discharge port of buffer tank;Wherein, negative pressure device is provided on recovery pipeline, power branch passes through negative pressure device, to drive dirty oil in recovery pipeline to flow to buffer tank by negative pressure device.The utility model has the beneficial effects: by setting injection branch and power branch, power branch continuously provides negative pressure for system, negative pressure provides the power of extracting dirty oil for negative pressure device, and when dirty oil extraction is completed, open first control valve to spray in buffer tank, can spray oxygen simultaneously, also can provide the power of extracting dirty oil for system, save cost.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical technology, and in particular to a waste oil recovery system. Background Technology

[0002] In the oil refining process, waste oil generated from oil sampling and residual sludge oil in refining equipment during maintenance need to be recovered. This waste oil can be reused after filtration. However, a large amount of oxygen entering the sludge oil recovery system can easily cause an explosion, posing a significant safety risk. Therefore, oxygen needs to be discharged during the recovery process.

[0003] The existing recycling system uses nitrogen to purge oxygen, but it also requires an extraction device to remove the sludge and oil, which requires additional energy for recycling and results in energy waste. Utility Model Content

[0004] This invention provides a waste oil recovery system to solve the technical problem that requires an extraction device to extract waste oil, which requires additional energy for recovery and results in energy waste.

[0005] This utility model provides a waste oil recovery system, comprising: The jetting pipeline includes parallel jetting branches and power branches; A buffer tank, the buffer tank having a spray nozzle, an inlet and a first outlet, the buffer tank being connected to the spray branch through the spray nozzle, and a first control valve being provided on the spray branch; A recovery pipeline, wherein the recovery pipeline is connected to the inlet of the buffer tank; A transport pipeline, wherein the transport pipeline is connected to the first outlet of the buffer tank; The recovery pipeline is equipped with a negative pressure device, and the power branch passes through the negative pressure device to drive the sludge in the recovery pipeline to flow to the buffer tank.

[0006] In one embodiment of the present invention, the recycling system further includes a gas discharge pipeline, and the buffer tank further has a second discharge outlet, wherein the gas discharge pipeline is connected to the second discharge outlet of the buffer tank.

[0007] In one embodiment of this utility model, a master control valve is provided on the jetting pipeline; A second control valve is installed on the power branch line; The main control valve is located at the front end of the jetting branch and the power branch.

[0008] In one embodiment of this utility model, a filter element and a third control valve are provided on the transport pipeline.

[0009] In one embodiment of this utility model, a flame arrester and a first adsorption element are provided on the gas discharge pipeline.

[0010] In one embodiment of this utility model, a flow-limiting orifice plate for generating negative pressure is provided in the jetting branch.

[0011] In one embodiment of this utility model, a fourth control valve is provided on the gas discharge pipeline.

[0012] In one embodiment of the present invention, the system further includes a waste oil tank and a waste oil recovery tank, wherein the waste oil tank is connected to the recovery pipeline and the waste oil recovery tank is connected to the transport pipeline.

[0013] In one embodiment of this utility model, a filter screen is fitted onto one end of the recovery pipeline that extends into the sludge tank.

[0014] In one embodiment of the present invention, the buffer tank is provided with a detection element for detecting air pressure.

[0015] The beneficial effects of this utility model are as follows: The waste oil recovery system proposed in this utility model is provided by setting up a blowing branch and a power branch. The power branch continuously provides negative pressure to the system, and the negative pressure provides power for the negative pressure device to extract waste oil. Moreover, after the waste oil is extracted, the first control valve is opened to blow oxygen into the buffer tank, which can blow oxygen while providing power for the system to extract waste oil, thus saving costs. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0018] The attached figures are labeled as follows: 1. Purge pipeline; 101. Purge branch; 102. Power branch; 103. First control valve; 104. Main control valve; 105. Second control valve; 106. Flow limiting orifice plate; 2. Buffer tank; 3. Recovery pipeline; 4. Transport pipeline; 401. Filter element; 402. Third control valve; 5. Negative pressure device; 6. Gas discharge pipeline; 601. Flame arrester; 602. First adsorption element; 603. Fourth control valve; 7. Detection element. Detailed Implementation

[0019] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0022] Please see Figure 1 , Figure 1 An embodiment of the present invention provides a waste oil recovery system, comprising a purging pipeline 1, a buffer tank 2, a recovery pipeline 3, and a transport pipeline 4. The purging pipeline 1 includes a parallel purging branch 101 and a power branch 102. The buffer tank 2 has a purging port, an inlet, and a first outlet. The buffer tank 2 is connected to the purging branch 101 through the purging port. The purging branch 101 is used to transport nitrogen gas, which is used to expel oxygen from the buffer tank 2, preventing explosions and improving safety. A first control valve 103 is provided on the purging branch 101. When nitrogen purging of the buffer tank 2 is not required, the first control valve 103 is closed. The recovery pipeline 3 is connected to the inlet of the buffer tank 2, and the transport pipeline 4 is connected to the first outlet of the buffer tank 2. The recovery pipeline 3 is equipped with a negative pressure device 5. The power branch 102 is connected to the negative pressure device 5. The nitrogen output from the power branch 102 passes through the negative pressure device 5 to form a negative pressure. The negative pressure is used to provide suction for the recovery pipeline 3 to draw in the sludge oil, thereby drawing the sludge oil into the buffer tank 2.

[0023] In this embodiment, the waste oil in the buffer tank 2 is processed and then output from the transport pipeline 4.

[0024] Specifically, in an optional embodiment of this application, the recovery system further includes a gas discharge pipeline 6, and the buffer tank 2 also has a second outlet. The gas discharge pipeline 6 is connected to the second outlet of the buffer tank 2. The second outlet is located at the top of the buffer tank 2, and the first outlet is located at the bottom of the buffer tank 2. The second outlet is used to discharge the gas produced by the volatilization of light components in the sludge oil in the buffer tank 2, and the first outlet is used to discharge the unvolatilized liquid sludge oil, so as to facilitate the discharge of volatilized gas and reduce the risk of explosion.

[0025] Specifically, in one optional embodiment of this application, a main control valve 104 is provided on the injection pipeline 1. A second control valve 105 is provided on the power branch 102. The main control valve 104 is located at the front end of the injection branch 101 and the power branch 102. The main control valve 104, located on the injection pipeline 1, controls the input of nitrogen. The second control valve 105 is located on the power branch 102. When it is necessary to extract sludge, the second control valve 105 and the fourth control valve 603 are opened (to prevent pressure buildup), and the first control valve 103 and the third control valve 402 are closed. Nitrogen is transported from the power branch 102, creating a negative pressure at the negative pressure device 5. After the sludge is extracted, the second control valve 105 is closed, and the first control valve 103 is opened to discharge the oxygen from the buffer tank 2, ensuring production safety. Simultaneously, the switching between the injection branch 101 and the power branch 102 improves the efficiency of nitrogen utilization.

[0026] Specifically, in one optional embodiment of this application, the transport pipeline 4 is equipped with a filter element 401 and a third control valve 402, and the recovery pipeline 3 is equipped with two fifth control valves, which are located upstream and downstream of the recovery pipeline 3, respectively (the inlet end of the recovery pipeline 3 and the negative pressure device 5 are upstream, and the outlet end of the recovery pipeline 3 and the negative pressure device 5 are downstream). After the collected sludge is filtered by the filter element 401, it is discharged into the collection device through the third control valve 402 for collection. When nitrogen is injected into the buffer tank 2, the third control valve 402 and the fifth control valve downstream of the recovery pipeline 3 must be closed to prevent the sludge from being discharged directly from the recovery pipeline 3 and the transport pipeline 4.

[0027] Specifically, in one optional embodiment of this application, a flame arrester 601 and a first adsorbent 602 are provided on the gas discharge pipeline 6. The first adsorbent 602 is made of activated carbon and is used to adsorb VOCs (Volatile Organic Compounds) in the volatile gas, so that the non-condensable gas discharged from the buffer tank 2 does not contain VOCs, ensuring that no VOCs will pollute the environment when the gas is discharged. The flame arrester 601 is located upstream of the first adsorbent 602, and the flame arrester 601 can prevent the flame from spreading to the unburned gas area in the event of combustion.

[0028] In this embodiment, a fourth control valve 603 is also provided on the gas discharge pipeline 6. Before sucking up the sludge, the fourth control valve 603 is opened to ensure positive pressure in the system. After the volatile gas in the buffer tank 2 is discharged to the first adsorption element 602 using nitrogen jet, the fourth control valve 603 is closed.

[0029] Specifically, in one optional embodiment of this application, a flow-limiting orifice plate 106 for generating negative pressure is provided in the injection branch 101. When high-pressure nitrogen passes through the flow-limiting orifice plate 106, the narrow cross section of the orifice plate forces the airflow to accelerate. The increase in flow velocity leads to a decrease in static pressure. At the outlet end of the flow-limiting orifice plate 106, the nitrogen flow velocity reaches its maximum and the static pressure drops to its minimum (i.e., negative pressure state). This characteristic enables the flow-limiting orifice plate 106 to stably control the nitrogen flow rate, while a negative pressure is continuously formed on the outlet side to provide output force for the sludge and oil absorption.

[0030] Specifically, in one optional embodiment of this application, the filter element 401 allows substances with a particle size of less than 25 micrometers to pass through, while large particles are filtered out, ensuring that the fluid can pass through while filtering out large particulate impurities in the sludge.

[0031] Specifically, in an optional embodiment of this application, it also includes a sludge tank and a sludge recovery tank. The sludge tank is connected to the inlet end of the recovery pipeline 3, and the sludge recovery tank is connected to the transport pipeline 4. The sludge tank is used to collect sludge generated during production, and the sludge recovery tank is used to collect sludge after filtration.

[0032] In this embodiment, a filter screen 301 is fitted onto one end of the recovery pipe 3 that extends into the sludge tank. The filter screen 301 covers the inlet of the end of the recovery pipe 3 that extends into the sludge tank, which can achieve a preliminary filtration effect and prevent large particles of impurities from impacting the negative pressure device 5 or the buffer tank 2.

[0033] Specifically, in one optional embodiment of this application, the buffer tank 2 is provided with a detection element 7 for detecting air pressure, which facilitates real-time detection of the air pressure in the buffer tank 2 and avoids situations where the pressure is too low or too high.

[0034] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A waste oil recovery system, characterized in that, include: The jetting pipeline includes parallel jetting branches and power branches; A buffer tank, the buffer tank having a spray nozzle, an inlet and a first outlet, the buffer tank being connected to the spray branch through the spray nozzle, and a first control valve being provided on the spray branch; A recovery pipeline, wherein the recovery pipeline is connected to the inlet of the buffer tank; A transport pipeline, wherein the transport pipeline is connected to the first outlet of the buffer tank; The recovery pipeline is equipped with a negative pressure device, and the power branch passes through the negative pressure device to drive the sludge in the recovery pipeline to flow into the buffer tank.

2. The sludge and oil recovery system according to claim 1, characterized in that: The recovery system also includes a gas discharge pipeline, and the buffer tank also has a second discharge outlet, with the gas discharge pipeline connected to the second discharge outlet of the buffer tank.

3. The sludge and oil recovery system according to claim 1, characterized in that: A main control valve is installed on the jetting pipeline; A second control valve is installed on the power branch line; The main control valve is located at the front end of the jetting branch and the power branch.

4. The sludge and oil recovery system according to claim 1, characterized in that: The transport pipeline is equipped with filters and a third control valve.

5. The sludge and oil recovery system according to claim 2, characterized in that: A flame arrester and a first adsorption element are installed on the gas discharge pipeline.

6. A sludge oil recovery system according to any one of claims 1-5, characterized in that: The jetting branch is equipped with a flow-limiting orifice plate for generating negative pressure.

7. The sludge and oil recovery system according to claim 2, characterized in that: A fourth control valve is installed on the gas discharge pipeline.

8. A sludge oil recovery system according to any one of claims 1-5, characterized in that: It also includes a waste oil tank and a waste oil recovery tank, the waste oil tank being connected to the recovery pipeline and the waste oil recovery tank being connected to the transport pipeline.

9. The sludge and oil recovery system according to claim 8, characterized in that: A filter screen is fitted onto one end of the recycling pipeline that extends into the sludge tank.

10. A sludge oil recovery system according to any one of claims 1-5, characterized in that: The buffer tank is equipped with a pressure detection device.

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