Delayed coking coke flow resistance characteristic testing device and testing method thereof

Abstract

The invention belongs to the technical field of porous medium performance parameter determination, and relates to a delayed coking coke flow resistance characteristic testing device and a testing method thereof. The device comprises a water tank, a plunger pump and a testing assembly, the water tank is connected with the plunger pump through a first pipe section, a pump inlet valve is arranged at the position, close to the plunger pump, of the first pipe section, the plunger pump is connected with the testing assembly through a second pipe section, a pump outlet valve is arranged at the position, close to the plunger pump, of the second pipe section, and an inlet pressure gauge is arranged at the position, close to the testing assembly, of the second pipe section. The testing assembly is connected with a third pipe section, an outlet pressure gauge and an outlet flow meter are sequentially arranged on a pipe body, close to the testing assembly, of the third pipe section, and an outlet of the third pipe section directly faces a top opening of the water tank. Water is adopted as a flowing medium, the grinding precision of the coke sample is reduced, the plunger pump is adopted for pressurization, and the problems that the pressure difference of a draught fan is small, the danger of high-pressure compressed air is large, and the flow resistance characteristic of a low-permeability porous medium is difficult to measure are solved.

Description

Technical Field

[0001] This invention belongs to the field of porous media performance measurement technology, specifically relating to a device and method for testing the flow resistance characteristics of delayed coking coke. Background Technology

[0002] Delayed coke is a type of petroleum coke with a porous structure produced through a delayed coking process. Its porosity and drag coefficient are key parameters describing fluid flow behavior. However, obtaining these parameters faces numerous challenges, including structural heterogeneity, limitations of measurement techniques, sample preparation difficulties, scale dependence, environmental influences, and dynamic changes.

[0003] Traditional porosity measurement methods include mercury infiltration and nuclear magnetic resonance. Mercury infiltration is suitable for measuring the distribution of larger pores, but its ability to detect micropores or nanopores is limited, and the toxicity of mercury and its destructive nature to samples restrict its application. Nuclear magnetic resonance (NMR) and scattering methods can provide detailed information on pore distribution, but the equipment is expensive and requires high sample homogeneity.

[0004] Patent CN104296962B discloses an experimental device for measuring the viscous resistance coefficient and inertial resistance coefficient of porous media. It mainly consists of four parts: an inlet pipe section, a test pipe section, an outlet pipe section, and an adjustable support bracket. However, its driving pressure is provided by the potential energy of a high-level water tank, which is insufficient for low-permeability porous media. Furthermore, the test section is not resistant to high pressure and lacks a side sealing structure. Patent CN117705669A discloses a device and method for determining the viscous resistance coefficient and inertial resistance coefficient of porous media, using a variable frequency fan to introduce gas into the test device. This is unsuitable for measuring high-pressure, low-permeability porous media. The document "Experimental Analysis of Oil-Water Flow Resistance Coefficient in Porous Media" discloses a device for measuring the oil-water migration resistance coefficient of porous media using water and oil as working fluids. It uses a pump to inject oil and water into the measurement section, with a maximum pressure difference of one atmosphere. Moreover, the pressure transmitter is installed on the side of the porous media measurement section, leading to significant side leakage.

[0005] For research on the properties of delayed coking coke, porosity and resistance coefficient are crucial performance parameters. Therefore, accurate and rapid measurement of these parameters is essential. While resistance coefficient can be measured through pressure drop tests, delayed coking coke with low permeability exhibits characteristics such as side leakage and high flow resistance, leading to inaccurate measurements and significant errors in the characteristic parameters. Summary of the Invention

[0006] This invention addresses the accuracy challenge in measuring the porosity and resistance coefficient of delayed coking coke with low permeability by proposing a testing device and method for testing the flow resistance characteristics of delayed coking coke.

[0007] To solve the above problems, the present invention adopts the following technical solution: A device for testing the flow resistance characteristics of delayed coking coke includes a water tank, a plunger pump, and test components. The water tank is connected to the plunger pump via a first pipe section. A pump inlet valve is provided on the first pipe section near the plunger pump. The plunger pump is connected to the test assembly via a second pipe section. An inlet pressure gauge is provided on the second pipe section near the test assembly. The test assembly is connected to a third pipe section. An outlet pressure gauge and an outlet flow meter are sequentially provided on the pipe body of the third pipe section near the test assembly. The outlet of the third pipe section is directly opposite the top opening of the water tank.

[0008] Furthermore, the test assembly includes a left flange, a housing, a gasket, a right flange, and a coke sample. The left flange, housing, and right flange are connected in sequence by bolts. The coke sample is installed inside the housing, and a gasket is provided between the left flange, housing, right flange, and coke sample.

[0009] Furthermore, the plunger pump is a flow-adjustable plunger pump.

[0010] Furthermore, both the inlet and outlet of the test component adopt a variable diameter structure.

[0011] Furthermore, the pipe diameter at the inlet pressure gauge installation location is the same as the diameter of the third pipe.

[0012] Furthermore, the sealing gasket has a T-shaped half-section.

[0013] Furthermore, the aspect ratio of the coke sample is less than 1, and the roughness Ra is less than 50 μm.

[0014] The present invention also provides a test method for a delayed coking coke flow resistance characteristic test device. This test method uses the aforementioned delayed coking coke flow resistance characteristic test device and includes the following steps: S1. Preparation of coke samples, ensuring that the surface roughness Ra is less than 50 μm; S2. Load the coke sample into the test assembly, check the operation and sealing of the components, and ensure that the seal is good and the operation is flexible. S3. Open the pump inlet valve and pump outlet valve, start the plunger pump at low speed, and gradually adjust the plunger pump speed to stabilize the flow rate. Record the pressure data from the inlet and outlet pressure gauges, and calculate the pressure drop of the coke sample. ; S4. Change the plunger pump speed to stabilize the flow rate. Record the pressure data from the inlet and outlet pressure gauges, and calculate the pressure drop of the coke sample. ; S5. Repeat steps S3 and S4 for a fixed flow rate. and Multiple measurements were performed, and multiple sets of pressure drop data were recorded. The average pressure drop at the corresponding flow rate was calculated. and ; S6. Increase the plunger pump speed to raise the inlet pressure gauge reading to above 1 MPa, maintain this pressure for at least 1 minute, then stop the pump to release the pressure. Remove the coke sample, dry the surface moisture with cold air, and weigh it to obtain the mass of the water-containing coke sample. ; S7. Place the weighed water-containing coke sample into a vacuum drying oven and dry it at 70~90℃. After drying, weigh it a second time to obtain the mass of the de-filled water-containing coke sample. ; S8. Obtain the mass data through two weighings, and calculate the porosity of the coke sample according to the porosity calculation formula; S9. Using the flow rate set in the application test and the calculated porosity, calculate the apparent flow velocity using the apparent flow velocity calculation formula; S10. Using the formula for calculating the resistance coefficient, the flow resistance coefficient of the coke sample is calculated.

[0015] Furthermore, the formula for calculating the average pressure drop is as follows: In the formula, for Average pressure drop of coke sample at the specified flow rate, Pa; for Average pressure drop of coke sample at the specified flow rate, Pa; In response to The pressure drop, in Pa, is measured for each flow rate measurement. In response to The pressure drop, in Pa, is measured for each flow rate measurement. The number of measurements; The formula for calculating the porosity of the coke sample is as follows: In the formula, Porosity; The mass of the water-containing coke sample is in kg. The mass of the coke sample to be filled with water is in kg; Where is the diameter of the coke sample, in meters; The sample length is in meters (m). The density of water, ; The formula for calculating the apparent flow velocity is: In the formula, The apparent velocity is in m / s; For water flow rate, ; Where is the diameter of the coke sample, in meters; Porosity.

[0016] Furthermore, the formula for calculating the drag coefficient of the coke sample is as follows: In the formula, The coefficient of viscosity resistance. For fluid dynamic viscosity, The inertial drag coefficient, The density of the medium is water. for Apparent flow rate under flow rate, for Apparent flow rate under flow rate for Average pressure drop of coke sample at flow rate for Average pressure drop of coke sample at flow rate The length is the sample length.

[0017] Compared with the prior art, the advantages of the present invention are: (1) The device for testing the flow resistance characteristics of delayed coking coke uses water as the flow medium and applies a plunger pump for pressurization, which can achieve high pressure drive. It is suitable for measuring the flow resistance of low-permeability porous media and will not explode, so it is less dangerous.

[0018] (2) The present invention sets a clamping flange and a sealing gasket in the measuring section of the delayed coking coke flow resistance characteristic test device to prevent side leakage and improve the accuracy of measurement; the downstream pressure measurement pipe section adopts a variable diameter structure, which reduces the size and ensures full pipe flow downstream, thus ensuring the accuracy of pressure.

[0019] (4) In the test method of the delayed coking coke flow resistance characteristic test device of the present invention, the aspect ratio of the coke sample in the measurement section is less than 1, which reduces the flow pressure difference, ensures the sealing effect of the end face and side face of the porous medium, and reduces the difficulty of measuring the flow resistance characteristics of the porous medium.

[0020] (5) The test method of the delayed coking coke flow resistance characteristic test device of the present invention uses the pressure water filling method to measure the porosity of the coke sample, which reduces the grinding precision of the coke sample and overcomes the problems that the image method cannot measure and the mercury injection method is expensive and dangerous. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a device for testing the flow resistance characteristics of delayed coking coke.

[0022] Figure 2 This is a schematic diagram of the test component structure.

[0023] Figure 3 This is a schematic diagram of the structure of a coke sample.

[0024] Figure 4 This is a flowchart of the test method for a device used to test the flow resistance characteristics of delayed coking coke.

[0025] The reference numerals in the above figures are as follows: 1-Water tank, 2-Outlet flow meter, 3-Outlet pressure gauge, 4-Test assembly, 4.1-Left flange, 4.2-Housing, 4.3-Gasket, 4.4-Right flange, 4.5-Coke sample, 5-Inlet pressure gauge, 6-Pump outlet valve, 7-Plunger pump, 8-Pump inlet valve, 9-First pipe section, 10-Second pipe section, 11-Third pipe section. Detailed Implementation

[0026] 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.

[0027] Example 1 See Figures 1-3 , Figures 1-3 A device for testing the flow resistance characteristics of delayed coking coke is provided, including a water tank 1, a test component 4, and a plunger pump 7; The water tank 1 is connected to the plunger pump 7 via a first pipe section 9. An inlet valve 8 is located on the first pipe section 9 near the plunger pump 7. The plunger pump 7 is connected to the test assembly 4 via a second pipe section 10. An outlet valve 6 is located on the second pipe section 10 near the plunger pump 7. An inlet pressure gauge 5 is located on the second pipe section 10 near the test assembly 4. The test assembly 4 is connected to a third pipe section 11. An outlet pressure gauge 3 and an outlet flow meter 2 are located on the third pipe section 11 near the test assembly 4. The outlet of the third pipe section 11 faces the top opening of the water tank 1. The inlet and outlet of the test assembly 4 adopt a variable diameter structure, reducing the downstream pipe diameter and ensuring full-pipe flow downstream. The pipe diameter at the location where the inlet pressure gauge 5 is installed is the same as the diameter of the third pipe section 11. The plunger pump 7 is a flow-adjustable plunger pump; the discharge flow rate can be changed by adjusting the speed of the plunger pump 7, thereby controlling the driving pressure of the device.

[0028] Reference Figure 2and Figure 3 A test component 4 in a delayed coking coke flow resistance characteristic testing device includes a left flange 4.1, a shell 4.2, a gasket 4.3, a right flange 4.4, and a coke sample 4.5. The left flange 4.1, shell 4.2, and right flange 4.4 are connected in sequence by bolts. The coke sample 4.5 is fitted in the middle of the shell 4.2. A gasket 4.3 is provided between the left flange 4.1, shell 4.2, right flange 4.4 and the coke sample 4.5. The gasket 4.3 has a T-shaped half-section, which can achieve end face and side sealing and effectively prevent media leakage from the test component 4.

[0029] Figure 3 The diagram shows the structure of the coke sample in the test assembly. It can be seen that the aspect ratio of the coke sample is less than 1.

[0030] Example 2 This embodiment provides a testing method for a device for testing the flow resistance characteristics of delayed coking coke. Figure 4 A flowchart of a test method for a device for testing the flow resistance characteristics of delayed coking coke is shown, including the following: step: S1. Preparation of coke sample 4.5: The dimensions of coke sample 4.5 are: length L = 0.05 m, diameter D = 0.06 m, ensuring that the surface roughness Ra is less than 50 μm; S2. Load the coke sample 4.5 into the test assembly 4, check the operation and sealing of the components, and ensure that the sealing is good and the operation is flexible; S3. Open pump inlet valve 8 and pump outlet valve 6, start plunger pump 7 at low speed, and gradually adjust the speed of plunger pump 7 to stabilize the flow rate. Record the data from inlet pressure gauge 5 and outlet pressure gauge 3, and calculate the pressure drop of the coke sample at 4.5. ; S4. Change the speed of plunger pump 7 to stabilize the flow rate. Record the data from inlet pressure gauge 5 and outlet pressure gauge 3, and calculate the pressure drop of the coke sample at 4.5. The pressure drop data from multiple measurements are shown in Table 1. Table 1 shows the measured pressure drop data from multiple measurements. S5. Repeat steps S3 and S4 for a fixed flow rate. and Perform multiple measurements, record multiple sets of pressure drop data, and apply the formula for calculating the average pressure drop: In the formula, for Average pressure drop of coke sample at flow rate 4.5, Pa; for Average pressure drop of coke sample at flow rate 4.5, Pa; In response to The pressure drop, in Pa, is measured for each flow rate measurement. In response to The pressure drop, in Pa, is measured for each flow rate measurement. The number of measurements.

[0031] The average pressure drop at the corresponding flow rate was calculated based on the data in Table 1. =53.26Pa and =213.023Pa; S6. Increase the speed of plunger pump 7 to raise the inlet pressure gauge 5 reading to above 1 MPa, maintain this pressure for at least 1 minute, then stop the pump to release the pressure. Remove coke sample 4.5, dry the surface moisture with cold air, and weigh it to obtain the water content. Coke sample 4.5 mass ; S7. Place the weighed water-containing coke sample 4.5 into a vacuum drying oven and vacuum dry it at a temperature of 70~90℃. After drying, weigh it a second time to obtain the mass of the de-filled water-containing coke sample 4.5. ; S8. Obtain mass data through two weighings, and calculate the porosity using the porosity formula: In the formula, Porosity; The mass of the water-containing coke sample is 4.5 kg. The mass of the coke sample to be filled with water was 4.5 kg. The coke sample has a diameter of 4.5 mm (m). The sample length is in meters (m). The density of water is kg / m³. 3 ; The porosity of the coke sample with a porosity of 4.5 was calculated. ; S9. Using the flow rate set in the application test and the calculated porosity, the apparent flow rate is calculated using the following formula: In the formula, The apparent velocity is in m / s; For water flow rate, ; The coke sample has a diameter of 4.5 mm (m). Porosity; Calculate the apparent flow velocity , ; S10. Application of the drag coefficient calculation formula: In the formula, The coefficient of viscosity resistance. The inertial drag coefficient, For fluid dynamic viscosity, The density of the medium is water. for Apparent flow rate under flow rate, for Apparent flow rate under flow rate for The average pressure drop of the coke sample at a flow rate of 4.5 was [data missing]. for The average pressure drop of the coke sample at a flow rate of 4.5 was [data missing]. Sample length; The viscous resistance coefficient of coke sample 4.5 was calculated. Inertial drag coefficient .

[0032] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A device for testing the flow resistance characteristics of delayed coking coke, characterized in that, Includes water tank, plunger pump, and test components; The water tank is connected to the plunger pump via a first pipe section. A pump inlet valve is provided on the first pipe section near the plunger pump. The plunger pump is connected to the test assembly via a second pipe section. A pump outlet valve is provided on the second pipe section near the plunger pump. An inlet pressure gauge is provided on the second pipe section near the test assembly. The test assembly is connected to a third pipe section. An outlet pressure gauge and an outlet flow meter are sequentially provided on the pipe body of the third pipe section near the test assembly. The outlet of the third pipe section is directly opposite the top opening of the water tank.

2. The device for testing the flow resistance characteristics of delayed coking coke according to claim 1, characterized in that, The test assembly includes a left flange, a housing, a gasket, a right flange, and a coke sample. The left flange, housing, and right flange are connected in sequence by bolts. The coke sample is installed inside the housing. A gasket is provided between the left flange, housing, right flange, and the coke sample.

3. The device for testing the flow resistance characteristics of delayed coking coke according to claim 1, characterized in that, The plunger pump is a flow-adjustable plunger pump.

4. The device for testing the flow resistance characteristics of delayed coking coke according to claim 2, characterized in that, The test component uses a variable diameter structure at both the inlet and outlet.

5. The device for testing the flow resistance characteristics of delayed coking coke according to claim 1, characterized in that, The diameter of the pipe at the inlet pressure gauge installation point is the same as the diameter of the third pipe.

6. The device for testing the flow resistance characteristics of delayed coking coke according to claim 2, characterized in that, The sealing gasket has a T-shaped half-section.

7. The device for testing the flow resistance characteristics of delayed coking coke according to claim 2, characterized in that, The aspect ratio of the coke sample is less than 1, and the roughness Ra is less than 50 μm.

8. A test method for the device for testing the flow resistance characteristics of delayed coking coke according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Preparation of coke samples, ensuring that the surface roughness Ra is less than 50 μm; S2. Load the coke sample into the test assembly, check the operation and sealing of the components, and ensure that the seal is good and the operation is flexible. S3. Open the pump inlet valve and pump outlet valve, start the plunger pump at low speed, and gradually adjust the plunger pump speed to stabilize the flow rate. Record the pressure data from the inlet and outlet pressure gauges, and calculate the pressure drop of the coke sample. ; S4. Change the plunger pump speed to stabilize the flow rate. Record the pressure data from the inlet and outlet pressure gauges, and calculate the pressure drop of the coke sample. ; S5. Repeat steps S3 and S4 for a fixed flow rate. and Multiple measurements were performed, and multiple sets of pressure drop data were recorded. The average pressure drop at the corresponding flow rate was calculated. and ; S6. Increase the plunger pump speed to raise the inlet pressure gauge reading to above 1 MPa, maintain this pressure for at least 1 minute, then stop the pump to release the pressure. Remove the coke sample, dry the surface moisture with cold air, and weigh it to obtain the mass of the water-containing coke sample. ; S7. Place the weighed water-containing coke sample into a vacuum drying oven and dry it at 70~90℃. After drying, weigh it a second time to obtain the mass of the de-filled water-containing coke sample. ; S8. Obtain the mass data through two weighings, and calculate the porosity of the coke sample according to the porosity calculation formula; S9. Using the flow rate set in the application test and the calculated porosity, calculate the apparent flow velocity using the apparent flow velocity calculation formula; S10. Using the formula for calculating the resistance coefficient, the flow resistance coefficient of the coke sample is calculated.

9. The test method for the delayed coking coke flow resistance characteristic test device according to claim 8, characterized in that, The formula for calculating the average pressure drop is: In the formula, for Average pressure drop of coke sample at the specified flow rate, Pa; for Average pressure drop of coke sample at the specified flow rate, Pa; In response to The pressure drop, in Pa, is measured for each flow rate measurement. In response to The pressure drop, in Pa, is measured for each flow rate measurement. The number of measurements; The formula for calculating the porosity of the coke sample is as follows: In the formula, Porosity; The mass of the water-containing coke sample is in kg. The mass of the coke sample to be filled with water is in kg; Where is the diameter of the coke sample, in meters; The sample length is in meters (m). The density of water, ; The formula for calculating the apparent flow velocity is: In the formula, The apparent flow velocity is in m / s; For water flow rate, ; Where is the diameter of the coke sample, in meters; Porosity.

10. The test method of the device for testing the flow resistance characteristics of delayed coking coke according to claim 8, characterized in that, The formula for calculating the resistance coefficient of the coke sample is: In the formula, The coefficient of viscosity resistance. For fluid dynamic viscosity, The inertial drag coefficient, The density of the medium is water. for Apparent flow rate under flow rate, for Apparent flow rate under flow rate for Average pressure drop of coke sample at flow rate for Average pressure drop of coke sample at flow rate The length is the sample length.

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