A crude oil storage tank sediment treatment device

Abstract

This invention discloses a crude oil storage tank sediment treatment device, relating to the field of crude oil treatment technology. It comprises, in sequence: a filter, the inlet of which is connected to the crude oil storage tank; an electrocatalytic oxidizer for oxidizing metal ions in the crude oil, the bottom of which is also provided with a steam inlet for introducing steam to increase the temperature and fluidity of the crude oil; a first centrifuge for separating solid impurity particles and oxidized metal ions from the crude oil; and a second centrifuge for oil-water separation. This invention can achieve effective separation of metal ions, improve treatment efficiency, and realize the resource utilization of waste oil.

Description

Technical Field

[0001] This invention relates to the field of crude oil processing technology, and in particular to a device for treating sediment in crude oil storage tanks. Background Technology

[0002] During the oil storage process, crude oil sediment will accumulate at the bottom of the tank, reducing its volume over time. Additionally, sediment can adhere to the tank walls, further reducing its volume. The main components of this sediment are: crude oil, solid impurity particles, water, and reducing metal ions (Fe2+). 2+ Mn 2+ These precipitates contain components such as crude oil, and 95-98% of the organic matter in them can be recovered. Therefore, it is necessary to clean the crude oil storage tanks regularly and treat the crude oil precipitates.

[0003] Currently, crude oil storage tanks are typically cleaned using a combination of mechanical cleaning and fluid flushing. For example, patent CN221890558U discloses a cleaning device for crude oil storage tanks, specifically including a first frame and a second frame. Both the first and second frames are equipped with easily movable wheels on their outer sides. A central fixed shaft is fixedly connected between the first and second frames. One end of the central fixed shaft is rotatably connected to a central rotating head. A first conveying pipe is provided on the outer side of the central rotating head. The end of the first conveying pipe is connected to a first branch pipe. The first branch pipe is equipped with a brush and has a spray nozzle on its outer wall. A second conveying pipe is provided on the outer side of the central rotating head. A second branch pipe is provided at the end of the second conveying pipe and has a nozzle on its outer side. The brush scrapes the inner wall of the storage tank, and the nozzle flushes the inner wall of the storage tank, thereby cleaning the crude oil storage tank.

[0004] However, while the aforementioned cleaning devices for crude oil storage tanks can clean the tanks, they cannot effectively recycle and reuse the sludge. Although some current solutions involve the subsequent treatment of crude oil sludge, they only perform simple separation by setting up solid-liquid separation devices or oil-water separation devices, which cannot effectively separate metal ions and have poor treatment effects.

[0005] Therefore, a crude oil storage tank sediment treatment device is provided to solve the above-mentioned technical problems existing in the prior art. Summary of the Invention

[0006] The purpose of this invention is to provide a crude oil storage tank sediment treatment device to solve the problems existing in the prior art, which can effectively separate metal ions, improve the treatment effect, and realize the resource utilization of waste oil.

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

[0008] This invention provides a crude oil storage tank sediment treatment device, comprising the following components connected in sequence:

[0009] A filter, the inlet end of which is used to connect to a crude oil storage tank;

[0010] An electrocatalytic oxidizer is used to oxidize metal ions in crude oil. The bottom of the electrocatalytic oxidizer is also provided with a steam inlet for introducing steam to increase the temperature and fluidity of the crude oil.

[0011] The first centrifuge is used to separate solid impurity particles and oxidized metal ions from crude oil.

[0012] The second centrifuge is used for oil-water separation.

[0013] Preferably, two filters are connected in parallel, and both the inlet and outlet ends of the filters are equipped with electrically controlled valves; wherein the mesh size of the filters is 10-20 mesh.

[0014] Preferably, the filter also includes a blockage detection mechanism, which is used to detect whether the filter is blocked. The blockage detection mechanism and the solenoid valve are both connected to the controller signal. When the blockage detection mechanism detects that the filter is blocked, the controller controls the solenoid valves at the inlet and outlet of the blocked filter to close and starts another filter.

[0015] Preferably, the blockage detection mechanism includes a first pressure sensor and a second pressure sensor, which are respectively disposed at the inlet and outlet of the filter to detect the pressure difference between the inlet and outlet of the filter. When the pressure difference exceeds a predetermined value, the controller determines that the filter is blocked and switches to another filter.

[0016] Preferably, it also includes a feed pump, which is disposed between the filter and the electrocatalytic oxidizer.

[0017] Preferably, the electrocatalytic oxidizer is equipped with a plate electrode, through which iron ions and manganese ions in crude oil are oxidized;

[0018] The plate electrodes are arranged in multiple pairs from front to back, with a plate spacing of 10-15mm. The voltage of a single pair of plate electrodes is 12V and the current is 6A.

[0019] Preferably, it also includes an ultrasonic generator, which is connected in parallel to the connecting pipeline between the electrocatalytic oxidizer and the feed pump, for pretreatment of crude oil.

[0020] Preferably, the first centrifuge is a horizontal decanter centrifuge, and the design speed of the horizontal decanter centrifuge is 3000-3500 rpm, and the differential speed is 2-32 rpm.

[0021] Preferably, the second centrifuge is a disc centrifuge, and the drum speed of the disc centrifuge is 6000-7000 rpm.

[0022] The present invention achieves the following technical effects compared to the prior art:

[0023] The crude oil storage tank sediment treatment device of this invention mainly includes, in sequence: a filter, the inlet of which is connected to the crude oil storage tank, through which large particles in the crude oil sediment are filtered out, preventing damage to subsequent unit equipment; an electrocatalytic oxidizer, used to oxidize metal ions (such as iron and manganese ions) in the crude oil, and a steam inlet at the bottom of the electrocatalytic oxidizer for introducing steam to increase the temperature and fluidity of the crude oil; a first centrifuge, used to separate solid impurity particles and oxidized metal ions in the crude oil, the liquid phase produced after separation by the first centrifuge enters the second centrifuge (described below), and the separated solid phase is treated as hazardous waste by a third party; and a second centrifuge, used to separate oil and water from the liquid phase produced after separation by the first centrifuge, the separated water is sent to a wastewater treatment plant for further treatment, and the separated oil can be sent to a return oil tank for refining. This invention can achieve effective separation of metal ions, improve treatment efficiency, and realize the resource utilization of waste oil. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the crude oil storage tank sediment treatment device in an embodiment of the present invention.

[0026] In the diagram: 100 - crude oil storage tank, 200 - filter, 300 - feed pump, 400 - electrocatalytic oxidizer, 401 - steam inlet, 500 - horizontal screw centrifuge, 600 - disc centrifuge. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The purpose of this invention is to provide a crude oil storage tank sediment treatment device to solve the problems existing in the prior art, which can effectively separate metal ions, improve the treatment effect, and realize the resource utilization of waste oil.

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] like Figure 1 As shown, this embodiment provides a crude oil storage tank sediment treatment device, which mainly includes the following components connected in sequence:

[0032] The filter 200 has its inlet end connected to the crude oil storage tank 100. The crude oil sediment in the crude oil storage tank 100 passes through the filter 200, which can filter out large particles in the crude oil sediment and prevent damage to subsequent unit equipment.

[0033] An electrocatalytic oxidizer 400 is used to oxidize metal ions (such as iron and manganese ions) in crude oil. The bottom of the electrocatalytic oxidizer 400 is also provided with a steam inlet 401 for introducing steam to increase the temperature and fluidity of the crude oil.

[0034] The first centrifuge is used to separate solid impurity particles and oxidized metal ions in crude oil. The liquid phase produced after separation by the first centrifuge enters the second centrifuge described below, and the solid phase after separation is treated as hazardous waste and entrusted to a third party for disposal.

[0035] The second centrifuge is used to separate the liquid phase produced by the first centrifuge into oil and water. The separated water is sent to a sewage treatment plant for further treatment, and the separated oil can be sent to a return oil tank for reprocessing.

[0036] This embodiment enables effective separation of metal ions, improves treatment efficiency, and realizes the resource utilization of waste oil.

[0037] In this embodiment, two filters 200 are arranged in parallel, and both the inlet and outlet ends of the filters 200 are equipped with electrically controlled valves; one of the two filters 200 is for backup use, and when one filter 200 is blocked, the other filter 200 can be turned on to ensure normal operation; wherein, the mesh size of the filters 200 is preferably 10-20 mesh, which can intercept larger impurity particles.

[0038] In this embodiment, a blockage detection mechanism is also included. This mechanism detects whether the filter 200 is blocked. Both the blockage detection mechanism and the electrically controlled valve are connected to the controller. When the blockage detection mechanism detects blockage in the filter 200, the controller closes the electrically controlled valves at the inlet and outlet of the blocked filter 200 and starts the other filter 200, thereby achieving automatic switching between the two filters 200. The controller can be selected according to specific operational needs; for example, it can be a PLC controller.

[0039] In this embodiment, the blockage detection mechanism can be selected according to specific working needs; as a preferred embodiment, the blockage detection mechanism may include a first pressure sensor and a second pressure sensor, the first pressure sensor and the second pressure sensor are respectively disposed at the inlet end and the outlet end of the filter 200, and are used to detect the pressure difference between the inlet end and the outlet end of the filter 200. When the pressure difference exceeds a predetermined value, the controller determines that the filter 200 is blocked and switches to another filter 200.

[0040] In this embodiment, a feed pump 300 is also included. The feed pump 300 is disposed between the filter 200 and the electrocatalytic oxidizer 400 and can provide power for the flow of crude oil sediment.

[0041] In this embodiment, the electrocatalytic oxidizer 400 is provided with a plate electrode, through which iron ions and manganese ions in crude oil are oxidized;

[0042] The plate electrodes are arranged in multiple pairs from front to back. The distance between the plates of the plate electrodes is 10-15mm. The voltage of a single pair of plate electrodes is 12V and the current is 6A. The temperature of the steam-heated material is controlled at 70-90℃ to ensure that the temperature of the cleaning oil after separation is >70℃.

[0043] This embodiment can ensure the presence of metal ions (Fe) in crude oil sediments. 2+ Mn 2+ Components such as iron and manganese can be fully oxidized, and the removal efficiency of total iron and manganese in crude oil precipitates can reach more than 98%, while reducing the blockage of crude oil precipitates between the plates.

[0044] In this embodiment, an ultrasonic generator is also included. The ultrasonic generator is connected in parallel to the connecting pipeline between the electrocatalytic oxidizer 400 and the feed pump 300, and is used to pre-treat the crude oil. Specifically, when processing crude oil precipitates with low viscosity and low metal ion content, they can be directly fed into the electrocatalytic oxidizer 400 for processing. When processing crude oil precipitates with high viscosity, complex composition, severe emulsification, or difficult-to-oxidize metal ions, they can be first sent to the ultrasonic processor in whole or in part for pre-treatment by ultrasonic cavitation before entering the electrocatalytic oxidizer 400 for deep oxidation. In this embodiment, this mode can utilize the ultrasonic effect to destroy colloidal structures, emulsion droplets, and organic macromolecules, exposing the encapsulated metal ions, thereby significantly improving the reaction rate and effect of subsequent electrocatalytic oxidation.

[0045] In this embodiment, the first centrifuge is preferably a horizontal decanter centrifuge 500, the design speed of which is 3000-3500 rpm and the differential speed is 2-32 rpm.

[0046] In this embodiment, the second centrifuge is preferably a disc centrifuge 600, wherein the drum speed of the disc centrifuge 600 is 6000-7000 rpm.

[0047] Alternatively, the first centrifuge and the second centrifuge may be selected from other centrifuges according to specific work needs.

[0048] The workflow of the crude oil storage tank sediment treatment device in this embodiment is as follows:

[0049] When the sediment in the crude oil storage tank 100 reaches a certain height, the feed pump 300 is started to pass the crude oil sediment at the bottom of the tank through the filter 200 to filter out large particles in the crude oil sediment and avoid damage to subsequent unit equipment.

[0050] Then, the precipitated crude oil enters the electrocatalytic oxidizer 400. The bottom of the electrocatalytic oxidizer 400 is equipped with a steam inlet 401. During operation, steam is added to increase the temperature and fluidity of the precipitated crude oil. In the electrocatalytic oxidizer 400, the crude oil passes through multiple pairs of plate electrodes in sequence, and the plate electrodes oxidize iron, manganese ions and other substances in the crude oil.

[0051] After heating and oxidation, the crude oil enters a horizontal screw centrifuge 500 to separate solid impurities and oxidized high-valence metal ions. The liquid phase separated by the horizontal screw centrifuge 500 enters a disc centrifuge 600 to complete oil-water separation. The separated water is sent to a wastewater treatment plant for further treatment. The separated solid phase is treated as hazardous waste and entrusted to a third party for disposal.

[0052] The liquid phase produced after separation in the first centrifuge is further separated by a disc centrifuge 600. The resulting water is then sent to a wastewater treatment plant for further treatment. Alternatively, it can be separated again by an oil-water separator and sent to a wastewater treatment plant for further treatment. The crude oil produced after separation by the disc centrifuge 600 is used for refining.

[0053] Specific examples have been used in this invention to illustrate the principles and implementation methods of the invention. The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the invention.

[0054] In summary, the content of this specification should not be construed as a limitation of the present invention; the above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. A crude oil tank sediment treatment apparatus, characterized by: It comprises sequentially connecting: a filter, the inlet end of which is used for connecting with a crude oil storage tank; an electro-catalytic oxidizer, which is used for oxidizing metal ions in the crude oil, and the bottom of which is further provided with a steam inlet for passing in steam to improve the temperature and fluidity of the crude oil; a first centrifuge, which is used for separating solid impurity particles and oxidized metal ions in the crude oil; a second centrifuge, which is used for oil-water separation; further comprising a feed pump, which is arranged between the filter and the electro-catalytic oxidizer; further comprising an ultrasonic generator, which is connected in parallel with the connecting pipeline between the electro-catalytic oxidizer and the feed pump, and is used for pretreating the crude oil; wherein the ultrasonic generator can destroy the colloid structure, emulsion droplets and organic macromolecules of the crude oil by using ultrasonic effect, so as to expose the wrapped metal ions.

2. The crude oil storage tank sediment treatment apparatus of claim 1, wherein: Two filters are arranged in parallel, and the inlet end and the outlet end of each filter are provided with an electric control valve; wherein the mesh number of the filter is 10-20 mesh.

3. The crude oil storage tank sediment treatment apparatus of claim 2, wherein: Further comprising a blockage detection mechanism, which is used for detecting whether the filter is blocked, and the blockage detection mechanism and the electric control valve are signal-connected with a controller; when the blockage detection mechanism detects that the filter is blocked, the controller controls the electric control valves at the inlet end and the outlet end of the blocked filter to be closed, and starts another filter.

4. The crude oil storage tank sediment treatment apparatus of claim 3, wherein: The blockage detection mechanism comprises a first pressure sensor and a second pressure sensor, which are arranged at the inlet end and the outlet end of the filter respectively, and are used for detecting the pressure difference at the inlet end and the outlet end of the filter; when the pressure difference exceeds a predetermined value, the controller judges that the filter is blocked and switches to another filter.

5. The crude oil storage tank sediment treatment apparatus of any one of claims 1-4, wherein: The electro-catalytic oxidizer is provided with a plate electrode, by which iron ions and manganese ions in the crude oil can be oxidized.

6. The crude oil storage tank sediment treatment apparatus of claim 5, wherein: The plate electrode is provided with multiple pairs from front to back, the plate spacing of the plate electrode is 10-15 mm, and the voltage of a single pair of the plate electrode is 12 V and the current is 6 A.

7. The crude oil storage tank sediment treatment apparatus of claim 1, wherein: The first centrifuge is a horizontal screw centrifuge, and the design speed of the horizontal screw centrifuge is 3000-3500 rpm, and the differential speed is 2-32 rpm.

8. The crude oil storage tank sediment treatment apparatus of claim 1, wherein: The second centrifuge is a disc centrifuge, and the drum speed of the disc centrifuge is 6000-7000 rpm.

Images