Homogenizing device for crude oil storage tank and method for treating stored oil liquid
By using a rotary nozzle and circulating pump system to create a vortex flow, the problems of uneven mixing and high risk of oil leakage in crude oil storage tanks are solved, achieving efficient crude oil homogenization and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2026-03-10
AI Technical Summary
Existing mechanical stirring methods result in uneven mixing within crude oil storage tanks, a high risk of oil leakage, and high maintenance costs.
The system employs a rotary nozzle and a circulating pump system. Crude oil is transported to the rotary nozzle through a circulating pipeline. Fluid power is used to rotate the rotary nozzle and spray oil, creating a vortex flow state to achieve homogenization.
It shortens the homogenization time of crude oil storage tanks, improves the utilization rate and homogenization quality of crude oil storage tanks, and reduces the risk of oil leakage and maintenance costs.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of crude oil storage tank stirring and mixing system, and is a crude oil storage tank homogenization device and a method for treating stored oil. BACKGROUND
[0002] With the development of China's economy and strategic requirements, the overall inventory of crude oil has been increasing year by year, and several oil storage bases have been built across the country, including several large commercial crude oil storage tanks with a capacity of millions of tons, such as Dongying Port and Dongjiagang Oil Depot, which have been put into operation or will be put into operation. The research on the size of crude oil storage tanks has also begun to explore tanks with a capacity of 100,000 cubic meters and above. The trend of large-scale storage and giant tank size has emerged in the development of crude oil reserves. Therefore, higher requirements are put forward for the storage quality of crude oil.
[0003] During the storage of crude oil, the settlement of crude oil is one of the factors that most affect the quality of crude oil. Heavy substances such as water, wax and solid substances in crude oil will gradually deposit on the tank bottom as the crude oil stands still, causing problems such as inhomogeneity of crude oil in the tank, corrosion of the tank bottom, high water content in the bottom oil, and increased frequency of tank cleaning. In recent years, mechanical stirring is usually used in crude oil storage systems to homogenize the crude oil in the tank.
[0004] At present, mechanical stirrers are inserted into the tank through manholes in the tank wall, and the fan blades of the mechanical stirrer are rotated to drive the stirring of the crude oil. Such a stirrer is usually composed of a motor, an impeller, a fixing mechanism, a sealing mechanism and the like. When in use, the motor needs to be powered on site. For a common 50,000m 3 For example, at least three mechanical stirrers need to be arranged for a crude oil storage tank. After the mechanical stirrers are fixedly installed, the area for stirring the oil in the crude oil storage tank is relatively fixed, often accompanied by dead angles, resulting in uneven stirring. Moreover, the stirring time is relatively long, and such mechanical stirring leads to a high risk of oil leakage from the crude oil storage tank, increasing the maintenance cost of the enterprise and posing a great risk of accidents to the safety of the crude oil tank area.
[0005] In summary, the mechanical stirring of crude oil has the disadvantages of uneven stirring of crude oil, high risk of oil leakage from the crude oil storage tank, and high maintenance cost of oil leakage, which have become technical problems difficult to solve for oil storage enterprises. SUMMARY
[0006] The present application provides a crude oil storage tank homogenization device and a method for treating stored oil, which overcomes the shortcomings of the prior art and effectively solves the problems of uneven oil quality, high risk of oil leakage from the crude oil storage tank, and high maintenance cost of oil leakage caused by the mechanical stirring of stored crude oil.
[0007] One of the technical solutions of the present application is realized by the following measures: a crude oil storage tank homogenization device and a method for treating and storing oil liquid, comprising a crude oil storage tank, a filter, a static mixer, a rotary sprayer is arranged at the bottom of the crude oil storage tank, an oil inlet pipeline is fixedly connected between the lower liquid inlet of the crude oil storage tank and the filter liquid inlet, a first circulating pipeline is fixedly connected between the first liquid outlet of the lower part of the crude oil storage tank and the filter liquid inlet, a second circulating pipeline is fixedly connected between the filter liquid outlet and the static mixer liquid inlet, a circulating pump is fixedly installed on the second circulating pipeline, and a third circulating pipeline is fixedly connected between the static mixer liquid outlet and the rotary sprayer bottom liquid inlet.
[0008] The following is a further optimization or / and improvement of one of the above-mentioned technical solutions of the present application: The rotary sprayer is symmetrically provided with nozzles on both sides, a rotary slide rail is arranged at the bottom of the rotary sprayer, a fixing frame is arranged at the bottom of the rotary slide rail, a turbine is arranged at the bottom liquid inlet of the rotary sprayer, a transmission shaft is fixedly connected to the top of the turbine, a transmission assembly is arranged at the top of the rotary sprayer, and the top of the transmission shaft is fixedly connected to the transmission assembly.
[0009] The remote liquid level meter is fixedly arranged on the crude oil storage tank.
[0010] The second liquid outlet of the lower part of the crude oil storage tank is fixedly connected with an oil export pipeline, and a first electric valve is fixedly installed on the oil export pipeline.
[0011] A second electric valve and a first water content detector are fixedly installed on the oil inlet pipeline along the medium flow direction.
[0012] A third electric valve is fixedly installed on the first circulating pipeline.
[0013] A fourth electric valve is fixedly installed on the second circulating pipeline between the filter liquid outlet and the circulating pump liquid inlet.
[0014] A second water content detector, a flow meter, a check valve, a fifth electric valve and a remote pressure gauge are fixedly installed on the third circulating pipeline between the static mixer liquid outlet and the lower liquid inlet of the crude oil storage tank along the medium flow direction.
[0015] The device further comprises a controller, and the circulating pump, the first electric valve, the remote liquid level meter, the second electric valve, the first water content detector, the third electric valve, the fourth electric valve, the second water content detector, the flow meter, the fifth electric valve and the remote pressure gauge are electrically connected to the controller.
[0016] The second technical solution of the present application is realized by the following measures: a method for processing and storing oil liquid in a crude oil storage tank homogenization device, which is performed according to the following steps: first step: upstream process crude oil enters the crude oil storage tank through the oil inlet pipeline, and the oil collection in the crude oil storage tank is stopped when the oil is collected to a safe liquid level; second step: the circulating pump is started, and the oil liquid in the lower part of the crude oil storage tank enters the filter through the first circulating pipeline to filter impurities; third step, the filtered oil liquid enters the static mixer through the second circulating pipeline for sufficient gas-liquid mixing; fourth step, the oil liquid after sufficient mixing enters the rotary jet device through the third circulating pipeline in turn, the oil liquid entering the bottom liquid inlet of the rotary jet device impacts the turbine blades, the oil liquid fluid power drives the turbine to rotate, the rotary kinetic energy is transmitted to the transmission assembly through the transmission shaft, and the transmission assembly drives the rotary jet device to rotate, at the same time, the oil liquid in the rotary jet device is sprayed from the nozzle; fifth step, the oil liquid in the crude oil storage tank forms a vortex flow state, and the homogenization treatment of the stored oil liquid in the crude oil storage tank is completed.
[0017] The present application extracts oil liquid in the crude oil storage tank through the circulating pump, and then delivers the oil liquid to the rotary jet device in the crude oil storage tank through the circulating pipeline. The rotary jet device sprays the oil liquid by means of fluid power, the crude oil in the crude oil storage tank forms a vortex flow state, the homogenization time of the crude oil storage tank is shortened, the utilization rate of the crude oil storage tank is improved, the homogenization quality of the stored oil liquid in the crude oil storage tank is improved, and the present application also has the advantages of low cost investment and high operation safety factor. BRIEF DESCRIPTION OF DRAWINGS
[0018] FIG. 1 is a process flow structure schematic diagram of the present application. Figure 1 FIG. 1 is a process flow structure schematic diagram of the present application.
[0019] FIG. 2 is a structure schematic diagram of the rotary jet device in the present application. Figure 2 FIG. 2 is a structure schematic diagram of the rotary jet device in the present application. Figure 1 FIG. 3 is a horizontal and vertical coordinate relationship diagram among the nozzle diameter, the radius of the crude oil storage tank and the circulating pump flow in the present application.
[0020] FIG. 4 is a top view schematic diagram of the mechanical stirring oil liquid effect of the crude oil storage tank. Figure 3 FIG. 4 is a top view schematic diagram of the mechanical stirring oil liquid effect of the crude oil storage tank.
[0021] FIG. 5 is a plan view schematic diagram of the homogenization oil liquid effect of the crude oil storage tank in the present application. Figure 4 FIG. 5 is a plan view schematic diagram of the homogenization oil liquid effect of the crude oil storage tank in the present application.
[0022] FIG. 5 is a plan view schematic diagram of the homogenization oil liquid effect of the crude oil storage tank in the present application. Figure 5 FIG. 5 is a plan view schematic diagram of the homogenization oil liquid effect of the crude oil storage tank in the present application.
[0023] The codes in the attached diagram are as follows: 1 is crude oil storage tank, 2 is filter, 3 is static mixer, 4 is rotary nozzle, 5 is oil inlet pipeline, 6 is first circulation pipeline, 7 is second circulation pipeline, 8 is circulation pump, 9 is third circulation pipeline, 10 is nozzle, 11 is rotary slide rail, 12 is fixed frame, 13 is turbine, 14 is drive shaft, 15 is transmission assembly, 16 is remote level gauge, 17 is crude oil export pipeline, 18 is first electric valve, 19 is second electric valve, 20 is first water content meter, 21 is third electric valve, 22 is fourth electric valve, 23 is second water content meter, 24 is flow meter, 25 is check valve, 26 is fifth electric valve, and 27 is remote pressure gauge. Detailed Implementation
[0024] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.
[0025] The present invention will be further described below with reference to embodiments: Example 1: As shown in the attached document Figure 1 As shown, the crude oil storage tank homogenization device includes a crude oil storage tank 1, a filter 2, and a static mixer 3. A rotary nozzle 4 is installed at the bottom of the crude oil storage tank 1. An oil inlet pipeline 5 is fixedly connected to the lower inlet of the crude oil storage tank 1. A first circulation pipeline 6 is fixedly connected between the lower first outlet of the crude oil storage tank 1 and the inlet of the filter 2. A second circulation pipeline 7 is fixedly connected between the outlet of the filter 2 and the inlet of the static mixer 3. A circulation pump 8 is fixedly installed on the second circulation pipeline 7. A third circulation pipeline 9 is fixedly connected between the outlet of the static mixer 3 and the bottom inlet of the rotary nozzle 4.
[0026] As needed, the static mixer 3 can shorten the homogenization time of crude oil in the crude oil storage tank 1 and improve the homogenization efficiency of crude oil. On the other hand, it can further reduce the particle size of droplets and impurities in the crude oil, enhance the stability of the crude oil after stirring and homogenization, and help improve the quality of exported crude oil.
[0027] Depending on the requirements, the circulating pump 8 can be a centrifugal pump, the rotary sprayer 4 can rotate 360° under the drive of the circulating liquid flow, and the static mixer 3 can be an SK-type counter-rotating cross-flow static mixer. For a 50,000m³... 3 Crude oil storage tank 1 needs to be equipped with a static mixer 3 with at least 10 mixing units. The component torsion angle of the static mixer 3 is 240° and the length-to-diameter ratio is 0.5. For crude oil storage tank 1 with larger capacity, the component torsion angle and length-to-diameter ratio remain unchanged, and a static mixer 3 with at least 11 to 15 mixing units needs to be configured.
[0028] Example 2: As an optimization of the above examples, as shown in the appendix Figure 2As shown, the rotary jet 4 is symmetrically provided with nozzles 10 on both sides, the rotary jet 4 is provided with a rotary slide rail 11 at the bottom, the rotary slide rail 11 is provided with a fixing frame 12 at the bottom, the rotary jet 4 is provided with a turbine 13 at the bottom, the turbine 13 is fixedly connected with a transmission shaft 14 at the top, the rotary jet 4 is provided with a transmission assembly 15 at the top, and the transmission shaft 14 is fixedly connected with the transmission assembly 15 at the top.
[0029] According to the need, the transmission assembly 15 can be a gear mesh transmission mechanism, the liquid flow impact on the turbine 13 blade at the bottom of the rotary jet 4, so that the turbine 13 rotates, and the rotary shaft 14 transmits the rotary kinetic energy to the transmission assembly 15, and the rotary assembly 15 drives the rotary jet 4 to rotate, while the oil liquid is sprayed from the nozzle 10, and the crude oil storage liquid in the crude oil storage tank 1 forms a strong vortex state, which has a homogenization effect on the oil liquid.
[0030] According to the need, the jet flow velocity at the end of the nozzle 10 is not less than 0.3m / s and not more than 0.5m / s, which can be used for 10000m 3 The above crude oil storage tank 1 has a good homogenization effect on the oil storage.
[0031] According to the need, the jet velocity of the nozzle 10 can be determined according to the diameter of the crude oil storage tank 1 and the diameter of the nozzle 10. The relationship among the diameter of the nozzle 10, the flow of the circulating pump 8 and the radius of the crude oil storage tank 1 is shown in the attached Figure 3 As shown.
[0032] Example 3: As an optimization of the above examples, as shown in the attached Figure 1 As shown, the remote liquid level meter 16 is fixedly arranged on the crude oil storage tank 1.
[0033] According to the need, the crude oil storage tank 1 can be selected as a dome tank and a floating roof tank, the safety liquid level of the dome tank is a liquid level height of more than 1500mm above the center line of the nozzle 10 of the rotary jet 4, and the safety liquid level of the floating roof tank is the sum of the stirrer installation height (≤1500mm), the length of the floating disc support leg and the guarantee liquid level (≥1500mm), so the safety liquid level of the floating roof tank is a liquid level height of more than 3000mm.
[0034] According to the need, when the crude oil storage tank 1 stops receiving oil near the highest safety liquid level, the homogenization of the crude oil in the crude oil storage tank 1 is started, and the homogenization of the crude oil after the crude oil storage tank 1 stops receiving oil can avoid the deformation caused by the impact of the oil liquid on the top structure of the crude oil storage tank 1.
[0035] Example 4: As an optimization of the above examples, as shown in the attached Figure 1 As shown, the second liquid outlet of the crude oil storage tank 1 is fixedly connected with the crude oil export pipeline 17, and the first electric valve 18 is fixedly installed on the crude oil export pipeline 17.
[0036] Example 5: As an optimization of the above examples, as shown in the attachedFigure 1 As shown, the second electric valve 19, the first water cut detector 20 are fixedly installed on the oil inlet pipeline 5 in sequence along the medium flow direction.
[0037] Embodiment 6: As an optimization of the above-mentioned embodiments, as shown in the accompanying drawings, Figure 1 As shown, the third electric valve 21 is fixedly installed on the first circulating pipeline 6.
[0038] Embodiment 7: As an optimization of the above-mentioned embodiments, as shown in the accompanying drawings, Figure 1 As shown, the fourth electric valve 22 is fixedly installed on the second circulating pipeline 7 between the filter 2 outlet and the circulating pump 8 inlet.
[0039] Embodiment 8: As an optimization of the above-mentioned embodiments, as shown in the accompanying drawings, Figure 1 As shown, the second water cut detector 23, the flow meter 24, the check valve 25, the fifth electric valve 26, the remote pressure gauge 27 are fixedly installed on the third circulating pipeline 9 between the static mixer 3 outlet and the crude oil storage tank 1 lower inlet in sequence along the medium flow direction.
[0040] According to the need, the first water cut detector 20 and the second water cut detector 23 can be crude oil online water cut detectors, which can read the average value of the crude oil water cut online, the detection mode is harmonic resonance, and has a temperature compensation function, the water cut resolution is at least 0.001%, the water cut measurement accuracy absolute value is at most ±0.05%, the water cut measurement range is at least 0 to 20%, the protection level is above IP65, the explosion-proof characteristic is explosion-proof, the main body material needs to be 304 and 316 stainless steel, and the output signal is RS485.
[0041] According to the need, the check valve 25 can be a swing check valve, which can prevent the oil in the third circulating pipeline 9 from flowing backward.
[0042] Embodiment 9: As an optimization of the above-mentioned embodiments, as shown in the accompanying drawings, Figure 1 As shown, the device further comprises a controller, and the circulating pump 8, the first electric valve 18, the remote liquid level meter 16, the second electric valve 19, the first water cut detector 20, the third electric valve 21, the fourth electric valve 22, the second water cut detector 23, the flow meter 24, the fifth electric valve 26, the remote pressure gauge 27 are electrically connected with the controller.
[0043] According to the need, the controller can be a DCS controller, and the model of the DCS controller can be OASyS 6.3SCADA.
[0044] In the present application, unless otherwise specified, the devices and apparatuses used are all the devices and apparatuses commonly known and used in the art.
[0045] Depending on the needs, the pipelines and equipment of the crude oil storage tank homogenization device may also be equipped with conventional valves, thermometers and pressure gauges known and commonly used in the field, according to production requirements.
[0046] Example 10: As attached Figure 1 As shown, the method for processing stored oil in the crude oil storage tank homogenization device is carried out according to the following steps: Step 1: Upstream process crude oil enters crude oil storage tank 1 through inlet pipeline 5 for storage. Oil collection in crude oil storage tank 1 stops when the oil level reaches a safe level. Step 2: Circulation pump 8 is turned on, and the oil in the lower part of crude oil storage tank 1 enters filter 2 through first circulation pipeline 6 to filter impurities. Step 3: The filtered oil enters static mixer 3 through second circulation pipeline 7 for thorough gas-liquid mixing. Step 4: The thoroughly mixed oil enters rotary nozzle 4 through third circulation pipeline 9. The oil entering through the bottom inlet of rotary nozzle 4 impacts the blades of turbine 13. The hydrodynamic force of the oil drives turbine 13 to rotate. The rotational kinetic energy is transmitted to transmission component 15 through transmission shaft 14. Transmission component 15 drives rotary nozzle 4 to rotate. At the same time, the oil in rotary nozzle 4 is sprayed out from nozzle 10. Step 5: The oil in crude oil storage tank 1 forms a vortex flow state, completing the homogenization treatment of the stored oil in crude oil storage tank 1.
[0047] As required, when the device is operating normally, the reading of the remote pressure gauge 27 shall not exceed 0.2 MPa, and the flow velocity of the oil on the wall surface in the crude oil storage tank 1 shall not be less than 0.3 m / s and not more than 0.5 m / s, so as to avoid deformation caused by the oil violently impacting the wall structure of the crude oil storage tank 1.
[0048] As needed, after the device is in operation, the controller collects the readings of the first moisture content detector 20, the second moisture content detector 23, the flow meter 24, and the remote pressure gauge 27 respectively. When the difference between the average real-time reading of the second moisture content detector 23 and the real-time reading of the first moisture content detector 20 is less than 10%, and the moisture content meets the standard for crude oil export, the homogenization treatment of the oil in the crude oil storage tank 1 can be terminated.
[0049] According to Embodiment 10 of the present invention, a method for processing stored oil using a crude oil storage tank homogenization device is tested for the following crude oil storage tank homogenization effect: like Figure 3 As shown, the crude oil storage tank (volume 50,000 m³) 3 The oil stored in the container (approximately 60m in diameter and 20m in height) was mechanically stirred. Tests showed that area A was a low-efficiency stirring zone, area B was a dead zone for stirring, and area C was the main stirring zone. like Figure 4 As shown, the crude oil storage tank (volume 50,000 m³) 3The oil stored in the container (approximately 60m in diameter and 20m in height) was homogenized using this invention. After testing, it was found that area A was the main stirring zone, area B was the low-efficiency stirring zone, and area C was the stirring dead zone. For crude oil storage tanks (volume 50,000 m³) 3 The method for stirring and treating oil stored in a container with a diameter of approximately 60m and a height of approximately 20m, the main stirring zone of this invention is significantly enlarged (e.g., Figure 4 As shown), the dead zone area of the stirring area is significantly reduced (e.g. Figure 4 (As shown).
[0050] The device uses a rotary jet sprayer 4 to rotate and agitate the oil in crude oil storage tank 1. The water that settles in the circulation pipeline is mixed and homogenized with the oil before being returned to crude oil storage tank 1. The annual discharge of oily wastewater is reduced to more than 10,000 tons, the water content of crude oil exported and the first sample failure rate are reduced to 7.4%, the annual cost of oily wastewater treatment can be reduced to more than 2 million yuan, and more than 20 million yuan of crude oil measurement losses can be saved for enterprises every year.
[0051] In summary, the present invention has the following adaptability and implementation effects: (1) Shorten the homogenization time of crude oil storage tanks, improve the utilization rate of crude oil storage tanks, reduce the particle size of droplets and impurities in crude oil, and enhance the stability of crude oil storage; (2) The homogenization operation time is shortened to less than 8 hours, improving the homogenization efficiency of crude oil storage tanks; (3) There is no need to load an electric agitator on the crude oil storage tank, there is no risk of oil leakage, and it is safe and environmentally friendly; (4) The homogenizing device of the crude oil storage tank can be used for 15 years or more. During use, only the instruments need to be maintained and repaired, and the maintenance cost is also low. (5) The present invention can also be used in other process systems to homogenize, heat, and clean various storage media, and has a wide range of applications.
[0052] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.
Claims
1. A crude oil storage tank homogenization apparatus, characterized by The application relates to a crude oil storage tank system, which comprises a crude oil storage tank, a filter and a static mixer.
2. The crude oil storage tank homogenization apparatus of claim 1, wherein The rotating spray device is provided with nozzles on both sides, a rotating slide rail is arranged at the bottom of the rotating spray device, a fixing frame is arranged at the bottom of the rotating slide rail, a turbine is arranged at the bottom inlet of the rotating spray device, a transmission shaft is fixedly connected to the top of the turbine, a transmission assembly is arranged at the top of the rotating spray device, and the top of the transmission shaft is fixedly connected with the transmission assembly.
3. The crude oil storage tank homogenization apparatus of claim 1 or 2, wherein A remote liquid level meter is fixedly arranged on the crude oil storage tank.
4. The crude oil storage tank homogenization apparatus of claim 1 or 2 or 3, wherein A first electric valve is fixedly arranged on the crude oil output pipeline.
5. The crude oil storage tank homogenization apparatus of any one of claims 1 to 4, wherein A second electric valve and a first water content detector are fixedly arranged on the oil inlet pipeline along the medium flow direction.
6. The crude oil storage tank homogenization apparatus of claim 5, wherein A third electric valve is fixedly arranged on the first circulating pipeline.
7. The crude oil storage tank homogenization apparatus of claim 6, wherein A fourth electric valve is fixedly arranged on the second circulating pipeline between the filter outlet and the circulating pump inlet.
8. The crude oil storage tank homogenization apparatus of claim 6 or 7, wherein A second water content detector, a flow meter, a check valve, a fifth electric valve and a remote pressure gauge are fixedly arranged on the third circulating pipeline between the static mixer outlet and the crude oil storage tank inlet along the medium flow direction.
9. The crude oil storage tank homogenization apparatus of claim 8, wherein The circulating pump, the first electric valve, the remote liquid level meter, the second electric valve, the first water content detector, the third electric valve, the fourth electric valve, the second water content detector, the flow meter, the fifth electric valve and the remote pressure gauge are electrically connected with the controller.
10. A method of processing a stored oil liquid by the crude oil storage tank homogenizing apparatus according to any one of claims 1 to 9, characterized by, The crude oil storage tank system is used in the following steps: first step, upstream crude oil enters the crude oil storage tank through the oil inlet pipeline, and the oil collection in the crude oil storage tank is stopped when the oil reaches a safe liquid level; second step, the circulating pump is started, and the oil in the lower part of the crude oil storage tank enters the filter through the first circulating pipeline to filter impurities; third step, the filtered oil enters the static mixer through the second circulating pipeline to fully mix gas and liquid; fourth step, the fully mixed oil enters the rotating spray device through the third circulating pipeline, the oil entering the bottom inlet of the rotating spray device impacts the turbine blades, the oil fluid power drives the turbine to rotate, the rotating kinetic energy is transmitted to the transmission assembly through the transmission shaft, the transmission assembly drives the rotating spray device to rotate, and the oil in the rotating spray device is sprayed from the nozzles; and fifth step, the oil in the crude oil storage tank forms a vortex flow state, and the homogenization treatment of the stored oil in the crude oil storage tank is completed.