A device and method for testing viscosity of slurry under high temperature and high pressure

Abstract

The application provides a device and method for testing viscosity of slurry under high temperature and high pressure. The device comprises a slurry heating and pressurizing kettle, a slurry testing pipeline and a slurry receiving tank which are sequentially communicated in the direction of slurry flow; a first buffer tank for maintaining constant pressure of the slurry heating and pressurizing kettle; the first buffer tank is in gas phase space communication with the slurry heating and pressurizing kettle; a second buffer tank for maintaining constant pressure of the slurry receiving tank; the second buffer tank is in gas phase space communication with the slurry receiving tank. The application solves the problem of lacking of testing viscosity of slurry under high temperature and high pressure in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of fluid dynamics parameter testing technology, specifically relating to an apparatus and method for testing the viscosity of slurry under high temperature and high pressure. Background Technology

[0002] Viscosity is a physical quantity that measures a fluid's ability to resist flow; simply put, it's the fluid's viscosity. Viscosity plays a crucial role in engineering and daily life, primarily in: 1. determining flow resistance or energy consumption; 2. affecting heat and mass transfer efficiency; 3. forming lubrication and sealing; 4. controlling product performance and quality; and 5. characterizing fluid properties. While the viscosity of fluids at normal temperature and pressure can be tested using methods such as capillary action and rotational methods, the viscosity of slurries containing solid particles under high temperature and pressure cannot be measured. Simulation software is often used to obtain simulated values, but these simulated values ​​still have significant deviations in practical applications.

[0003] CN 120721570A discloses a high-temperature melt viscosity testing device and method. The testing device includes: a testing chamber; a vision component disposed on one side of the testing chamber; and an adjustment mechanism, with the testing chamber and the vision component positioned above the adjustment mechanism. The vision component acquires the changing state of the material within the testing chamber and calculates the viscosity of the material. The vision component allows for real-time monitoring of image data of the material within the testing chamber, and the viscosity is calculated based on changes in dimensional data. The testing chamber allows for temperature and atmosphere control, facilitating the adjustment of high-temperature melt viscosity under different testing environments. The testing is simple, requires a small sample volume, and has a short testing time. Therefore, this testing method is not suitable for testing the viscosity of slurries under high-pressure conditions.

[0004] CN109342271A discloses a capillary viscosity testing method based on trace sample measurement. The method involves filling a flow path with a fluid medium, then introducing the sample fluid, which propels the sample through the capillary. When the sample fluid viscosity is low or the volume reduction due to compression under high pressure is negligible, the volume V of the injected liquid is set greater than the capillary volume Vc. When the sample fluid viscosity is high and the volume reduction due to compression under high pressure is not negligible, multiple injections are performed, with each injection volume V less than the capillary volume Vc. This invention reduces sample consumption by adjusting the fluid medium. Furthermore, this invention eliminates the need for standard sample calibration to calculate sample viscosity, further reducing sample consumption. The low sample consumption facilitates the testing of trace samples, broadening the sample testing range. This invention is applicable to the viscosity determination of non-Newtonian fluids and has good practicality. However, this testing method is not suitable for testing slurries containing solid particles. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide an apparatus and method for testing the viscosity of slurry under high temperature and high pressure. This invention solves the technical problem of lacking a method for testing the viscosity of slurry under high temperature and high pressure conditions in the prior art.

[0006] The technical solution of this invention is:

[0007] The present invention provides an apparatus for testing the viscosity of slurry under high temperature and high pressure. The apparatus includes a slurry heating and pressurizing vessel, a slurry testing pipeline and a slurry receiving tank connected in sequence according to the slurry flow direction.

[0008] It also includes a first buffer tank for maintaining a constant pressure in the slurry heating and pressurizing reactor; the first buffer tank is connected to the gas phase space of the slurry heating and pressurizing reactor.

[0009] It also includes a second buffer tank for maintaining a constant pressure in the slurry receiving tank; the second buffer tank and the slurry receiving tank are connected in the gas phase space.

[0010] In some embodiments of the present invention, the slurry heating and pressurizing vessel is equipped with a stirring unit; the slurry receiving tank is equipped with a cooling unit.

[0011] In some embodiments of the present invention, the slurry receiving tank includes a first receiving tank and a second receiving tank; the first receiving tank and the second receiving tank are arranged in parallel, and the gas phase spaces of the first receiving tank and the second receiving tank are respectively connected to a second buffer tank.

[0012] In some embodiments of the present invention, the first receiving tank is provided with a first weighing module.

[0013] In some embodiments of the present invention, the second receiving tank is provided with a second weighing module.

[0014] In some embodiments of the present invention, a first condenser is provided on the connecting pipeline between the second buffer tank and the first receiving tank.

[0015] In some embodiments of the present invention, a second condenser is provided on the connecting pipeline between the second buffer tank and the second receiving tank.

[0016] In some embodiments of the present invention, a third condenser is provided on the connecting pipeline between the slurry heating and pressurizing vessel and the first buffer tank.

[0017] In some embodiments of the present invention, a first shut-off valve is provided on the connecting pipeline between the slurry testing pipeline and the first receiving tank.

[0018] In some embodiments of the present invention, a second shut-off valve is provided on the connecting pipeline between the slurry testing pipeline and the second receiving tank.

[0019] In some embodiments of the present invention, the inlet of the slurry testing pipeline is provided with a first pressure gauge and a first thermometer.

[0020] In some embodiments of the present invention, the outlet of the slurry testing pipeline is provided with a second pressure gauge and a second thermometer.

[0021] In some embodiments of the present invention, the inlet of the slurry testing pipeline is provided with a feed shut-off valve.

[0022] In some embodiments of the present invention, the slurry testing pipeline is a single-loop multi-layer type, with the inlet of the slurry testing pipeline located at the uppermost end of the slurry testing pipeline and the outlet of the slurry testing pipeline located at the lowermost end of the slurry testing pipeline.

[0023] In some embodiments of the present invention, an electric heating tape is provided on the outside of the slurry testing pipeline; the slurry testing pipeline and the electric heating tape are together housed in an insulated box.

[0024] The present invention also provides a method for testing the viscosity of slurry under high temperature and high pressure, using the apparatus described in the present invention, and the method includes the following steps:

[0025] 1) Heat the slurry to be tested in a slurry heating and pressurizing reactor to the test temperature, and add nitrogen to the test pressure to obtain a high-temperature and high-pressure slurry; heat the slurry test pipeline to the test temperature;

[0026] 2) Nitrogen gas is introduced into the first buffer tank, the slurry receiving tank, and the second buffer tank respectively; so that the pressure in the first buffer tank is greater than the pressure in the slurry heating and pressurizing reactor; so that the pressure in the second buffer tank is greater than the pressure in the slurry receiving tank; connect the first buffer tank and the slurry heating and pressurizing reactor, and connect the second buffer tank and the slurry receiving tank.

[0027] 3) Pass the high-temperature and high-pressure slurry from step 1) into the slurry test pipeline and receive it in the slurry receiving tank; record the test time, the pressure drop at the inlet and outlet of the slurry test pipeline, measure the volume of slurry in the slurry receiving tank, and calculate the slurry viscosity based on the slurry volume, test time, and pressure drop at the inlet and outlet of the slurry test pipeline.

[0028] In some embodiments of the present invention, in step 3), the viscosity of the slurry under high temperature and high pressure is obtained according to the Hagen-Poiseuille law; ,in, μ is the viscosity, R is the radius of the slurry test pipeline, R=d / 2, d is the inner diameter of the slurry test pipeline, ΔP is the pressure drop at the inlet and outlet of the slurry test pipeline, L is the length of the slurry test pipeline, Q is the volumetric flow rate, V is the slurry volume, and t is the test time.

[0029] In some embodiments of the present invention, in step 3), the viscosity of the slurry under high temperature and high pressure is obtained according to the Blasius formula and the Darcy-Weisbach formula. Where μ is viscosity, ρ is fluid density, v is flow velocity, d is inner diameter of slurry test pipeline, L is pipeline length, and ΔP is pressure drop at the inlet and outlet of slurry test pipeline.

[0030] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0031] The apparatus and method provided by this invention first involve heating and pressurizing the slurry to the test temperature in a slurry heating and pressurizing reactor; then, the slurry under high temperature and pressure is pressurized and fed into a slurry testing pipeline and received by a slurry receiving tank; finally, the viscosity of the slurry under high temperature and pressure is calculated by testing parameters such as the pressure drop at the inlet and outlet of the slurry testing pipeline, the test time, and the slurry volume. To ensure the stability of the pressure drop in the slurry testing pipeline and avoid pressure fluctuations when the slurry leaves the slurry heating and pressurizing reactor, this invention includes a first buffer tank to balance pressure fluctuations in the slurry heating and pressurizing reactor; and a second buffer tank to balance pressure fluctuations in the slurry receiving tank. Attached Figure Description

[0032] Figure 1 The diagram shows a schematic of the apparatus for testing the viscosity of slurry under high temperature and high pressure as described in this invention.

[0033] Figure 1 middle:

[0034] 1. Slurry heating and pressurization reactor;

[0035] 2. Slurry testing pipeline;

[0036] 3. First receiving tank;

[0037] 4. First buffer tank;

[0038] 5. Second buffer tank;

[0039] 6. Second receiving tank;

[0040] 7. Third condenser;

[0041] 8. First condenser;

[0042] 9. Second condenser;

[0043] 10. Feed shut-off valve;

[0044] 11. First shut-off valve;

[0045] 12. Second shut-off valve;

[0046] 13. Power supply;

[0047] 14. Electric heating tape;

[0048] 15. Insulated boxes;

[0049] 16. First pressure gauge;

[0050] 17. First thermometer;

[0051] 18. Second pressure gauge;

[0052] 19. Second thermometer;

[0053] 20 First weighing module;

[0054] 21. Second weighing module;

[0055] 22. Stirring unit. Detailed Implementation

[0056] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of this application.

[0057] The terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0059] Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0060] like Figure 1This invention provides an apparatus for testing the viscosity of slurry under high temperature and high pressure. The apparatus includes a slurry heating and pressurizing vessel 1, a slurry testing pipeline 2, and a slurry receiving tank, which are connected sequentially in the slurry flow direction. The slurry heating and pressurizing vessel 1 is used to heat and pressurize the slurry, the slurry testing pipeline 2 is used to test the slurry flow state, and the slurry receiving tank is used to receive the slurry flowing out of the slurry testing pipeline 2. The apparatus also includes a first buffer tank 4 for maintaining a constant pressure in the slurry heating and pressurizing vessel 1; the first buffer tank 4 is connected to the vapor phase space of the slurry heating and pressurizing vessel 1. The apparatus further includes a second buffer tank 5 for maintaining a constant pressure in the slurry receiving tank; the second buffer tank 5 is connected to the vapor phase space of the slurry receiving tank.

[0061] The specific process for testing the viscosity of slurry under high temperature and high pressure according to this invention is as follows: First, the slurry is heated and pressurized to the test temperature in a slurry heating and pressurizing reactor 1; then, the slurry under high temperature and high pressure is pressurized and transported into the slurry testing pipeline 2 and received by the slurry receiving tank; finally, the viscosity of the slurry under high temperature and high pressure is calculated by testing parameters such as the pressure drop at the inlet and outlet of the slurry testing pipeline 2, the test time, and the slurry volume. To ensure the stability of the pressure drop in the slurry testing pipeline 2 and avoid pressure fluctuations when the slurry leaves the slurry heating and pressurizing reactor 1, this invention sets up a first buffer tank 4 to balance the pressure fluctuations in the slurry heating and pressurizing reactor 1; and a second buffer tank 5 to balance the pressure fluctuations in the slurry receiving tank.

[0062] In the apparatus for testing the viscosity of slurry under high temperature and high pressure provided in the embodiments of the present invention, preferably, as shown in the example... Figure 1 The slurry heating and pressurizing vessel 1 is equipped with a stirring unit 22; the slurry receiving tank is equipped with a cooling unit. The stirring unit 22 in the slurry heating and pressurizing vessel 1 prevents the settling of solid particles in the slurry, and the cooling unit in the slurry receiving tank reduces flash evaporation loss and increases the cooling rate, saving testing time. The stirring unit 22 is, for example, a stirrer, and the cooling unit is, for example, a jacketed cooling system.

[0063] In the apparatus for testing the viscosity of slurry under high temperature and high pressure provided in the embodiments of the present invention, more preferably, as follows: Figure 1The slurry receiving tank includes a first receiving tank 3 and a second receiving tank 6; the first receiving tank 3 and the second receiving tank 6 are arranged in parallel, and the gas phase spaces of the first receiving tank 3 and the second receiving tank 6 are respectively connected to the second buffer tank 5. During the test, data from the most stable time period of the slurry passing through the slurry test pipeline 2 needs to be taken for calculation, as this yields the highest reliability. The first receiving tank 3 is used to receive the slurry flowing out of the slurry test pipeline 2 in the early stage, and switches to the second receiving tank 6 after the temperature and pressure stabilize. Timing starts from the start of the switch, and after a certain test time, the second receiving tank 6 is closed. Based on the time and the slurry volume parameters in the slurry receiving tank, parameters such as flow rate are calculated, and the slurry viscosity is further calculated. The first receiving tank 3 is equipped with a first weighing module 20; the second receiving tank 6 is equipped with a second weighing module 21. When the density parameter of the slurry is known, the volume of the slurry can be quickly calculated based on the weight data given by the weighing module, facilitating the rapid calculation of the slurry viscosity under high temperature and high pressure. In addition, the first receiving tank 3 and the second receiving tank 6 are each equipped with a cooling unit.

[0064] In the apparatus for testing the viscosity of slurry under high temperature and high pressure provided in the embodiments of the present invention, a more preferably, as follows: Figure 1 A first condenser 8 is provided on the connecting pipe between the second buffer tank 5 and the first receiving tank 3 to cool the exhaust gas from the first receiving tank 3. The first condenser 8 is installed on the vertical section of the connecting pipe near the first receiving tank 3, from... Figure 1 As can be seen, the connecting pipeline between the second buffer tank 5 and the first receiving tank 3 includes a vertical section and a horizontal section.

[0065] A second condenser 9 is provided on the connecting pipe between the second buffer tank 5 and the second receiving tank 6 to cool the exhaust gas from the second receiving tank 6. The second condenser 9 is located on the vertical section of the connecting pipe near the second receiving tank 6. Figure 1 As can be seen, the connecting pipeline between the second buffer tank 5 and the second receiving tank 6 includes a vertical section and a horizontal section.

[0066] A third condenser 7 is provided on the connecting pipeline between the slurry heating and pressurizing vessel 1 and the first buffer tank 4 to cool the exhaust gas from the slurry heating and pressurizing vessel 1. The third condenser 7 is located on the vertical section of the connecting pipeline near the slurry heating and pressurizing vessel 1.

[0067] Before the actual test, sufficient nitrogen gas is introduced into the first buffer tank 4 and the second buffer tank 5. The pressure difference between the two sides ensures that the slurry flows in a laminar or transitional flow state in the slurry test pipeline 2. When the temperature inside the slurry heating and pressurizing vessel 1 reaches the test temperature, the first buffer tank 4 and the slurry heating and pressurizing vessel 1 are connected. Nitrogen gas from the first buffer tank 4 is introduced into the slurry heating and pressurizing vessel 1 and balanced. The third condenser 7 can reduce the amount of liquid vapor entering the first buffer tank 4 from the slurry heating and pressurizing vessel 1. At the same time, the second buffer tank 5 is connected to the first receiving tank 3 and the second receiving tank 6. Nitrogen gas from the second buffer tank 5 is introduced into the first receiving tank 3 and the second receiving tank 6 and balanced. The first condenser 8 and the second condenser 9 can reduce the amount of liquid vapor entering the second buffer tank 5 during the test, improving the accuracy of the test results.

[0068] In the apparatus for testing the viscosity of slurry under high temperature and high pressure provided in the embodiments of the present invention, a further preferred embodiment is, for example... Figure 1 A first shut-off valve 11 is provided on the connecting pipe between the slurry testing pipeline 2 and the first receiving tank 3, and a second shut-off valve 12 is provided on the connecting pipe between the slurry testing pipeline 2 and the second receiving tank 6. By setting the first shut-off valve 11 and the second shut-off valve 12, the slurry flowing from the slurry testing pipeline 2 can be quickly switched from entering the first receiving tank 3 to entering the second receiving tank 6, or vice versa. Timing is performed during the switching process, which can improve the switching speed and testing accuracy.

[0069] In the apparatus for testing the viscosity of slurry under high temperature and high pressure provided in the embodiments of the present invention, a further preferred embodiment is, for example... Figure 1 A first pressure gauge 16 and a first thermometer 17 are provided at the inlet of the slurry testing pipeline 2; a second pressure gauge 18 and a second thermometer 19 are provided at the outlet of the slurry testing pipeline 2; and a feed shut-off valve 10 is also provided at the inlet of the slurry testing pipeline 2. To improve the accuracy of testing slurry viscosity under high temperature and high pressure conditions and reduce the influence of local resistance on the testing process, this invention requires taking the pressure and temperature of the slurry at the inlet of the slurry testing pipeline 2 and the temperature and pressure of the slurry at the outlet of the slurry testing pipeline 2 to calculate the pressure drop. This more accurately reflects the pressure drop across the slurry testing pipeline 2 than calculating the pressure drop using pressure and temperature data from the slurry heating and pressurizing vessel 1 and the slurry receiving tank. It also eliminates the need to correct for local resistance losses as the slurry enters the slurry testing pipeline 2 from the slurry heating and pressurizing vessel 1 and from the slurry testing pipeline 2 into the slurry receiving tank, resulting in more accurate test results.

[0070] In the apparatus for testing slurry viscosity under high temperature and high pressure provided in this embodiment of the invention, preferably, the slurry testing pipeline 2 is a single-turn multi-layer type, with the inlet of the slurry testing pipeline 2 located at the uppermost end and the outlet of the slurry testing pipeline 2 located at the lowermost end. To avoid the problem of excessive equipment length associated with straight pipes, this invention adopts a single-turn multi-layer spiral tube. When the diameter of the spiral tube is greater than 100 times the inner diameter of the tube, it has no adverse effect on the accuracy of the test results. Positioning the inlet of the slurry testing pipeline 2 at the uppermost end and the outlet at the lowermost end reduces air resistance during slurry flow in the slurry testing pipeline 2, thereby improving test accuracy.

[0071] In the apparatus for testing the viscosity of slurry under high temperature and high pressure provided in this embodiment of the invention, preferably, an electric heating tape 14 is provided on the outside of the slurry testing pipeline 2; the slurry testing pipeline 2 and the electric heating tape 14 are jointly disposed in an insulated box 15. Preheating the slurry testing pipeline 2 by the electric heating tape 14 can reduce the temperature and pressure changes when the slurry enters the slurry testing pipeline 2, improving the accuracy of the test. The insulated box 15 can reduce heat loss and ensure the temperature stability of the slurry testing pipeline 2 during the test process. A power supply 13 is also included, which provides electrical energy to the electric heating tape 14.

[0072] In the apparatus for testing the viscosity of slurry under high temperature and high pressure provided in the embodiments of the present invention, thermometers and pressure gauges for testing the temperature and pressure of the relevant tanks or reactors are respectively provided on the slurry heating and pressurizing vessel 1, the first receiving tank 3, the second receiving tank 6, the first buffer tank 4, and the second buffer tank 5.

[0073] Methods for testing slurry viscosity under high temperature and high pressure

[0074] This invention also provides a method for testing the viscosity of a slurry under high temperature and high pressure, the method comprising the following steps:

[0075] 1) Heat the slurry to be tested in the slurry heating and pressurizing vessel 1 to the test temperature, and add nitrogen to the test pressure to obtain a high temperature and high pressure slurry; heat the slurry test pipeline 2 to the test temperature;

[0076] 2) Nitrogen gas is introduced into the first buffer tank 4, the slurry receiving tank, and the second buffer tank 5 respectively; so that the pressure in the first buffer tank 4 is greater than the pressure in the slurry heating and pressurizing vessel 1; so that the pressure in the second buffer tank 5 is greater than the pressure in the slurry receiving tank; the first buffer tank 4 and the slurry heating and pressurizing vessel 1 are connected, and the second buffer tank 5 and the slurry receiving tank are connected.

[0077] 3) Pass the high-temperature and high-pressure slurry from step 1) into the slurry test pipeline 2 and receive it in the slurry receiving tank; record the test time, the pressure drop at the inlet and outlet of the slurry test pipeline 2, measure the volume of slurry in the slurry receiving tank, and calculate the slurry viscosity based on the slurry volume, test time, and pressure drop at the inlet and outlet of the slurry test pipeline 2.

[0078] In the method provided by this embodiment of the invention, step 1) involves heating the slurry to be tested to the test temperature in a slurry heating and pressurizing reactor 1, supplementing nitrogen to the test pressure, and obtaining a high-temperature and high-pressure slurry; then heating the slurry test pipeline 2 to the test temperature. Specifically:

[0079] In step 1) of this invention, the concentration of the slurry to be tested varies greatly depending on the different systems, with common concentrations ranging from 35 g / L to 100 g / L.

[0080] In step 1) of this invention, the test temperature is 40~300℃, which can be selected as 40~120℃, 120~200℃, or 200~300℃. The test pressure is 0~20MPaG, which can be selected as 0~10MPaG, 10~20MPaG, 0~5MPaG, 5~10MPaG, 10~15MPaG, or 15~20MPaG. The purpose of this invention is to test the viscosity of slurry under high temperature and high pressure. In the field of chemical engineering, the viscosity of slurry at 40~300℃ and 0~20MPaG can be accurately tested, and even the viscosity of slurry under negative pressure conditions can be tested.

[0081] In step 1) of this invention, the slurry test pipeline 2 is heated to the test temperature by the electric heating tape 14.

[0082] In step 1) of this invention, the inner diameter of the slurry testing pipe 2 is 0.5~5mm. The length of the slurry testing pipe 2 needs to be adjusted according to the diameter of the testing pipe. When the diameter of the testing pipe is small, a shorter pipe length can be used, and vice versa. The diameter of the testing pipe is mainly selected based on the particle size of the slurry solid particles. When the particle size D50 of the slurry is small, a small-diameter testing pipe can be used; otherwise, a large-diameter testing pipe is required to avoid clogging.

[0083] In the method provided by this embodiment of the invention, step 2) involves filling the first buffer tank 4, the slurry receiving tank, and the second buffer tank 5 with nitrogen gas; making the pressure in the first buffer tank 4 greater than the pressure in the slurry heating and pressurizing reactor 1; making the pressure in the second buffer tank 5 greater than the pressure in the slurry receiving tank; connecting the first buffer tank 4 and the slurry heating and pressurizing reactor 1, and connecting the second buffer tank 5 and the slurry receiving tank. The first buffer tank 4 is used to balance the pressure fluctuations in the slurry heating and pressurizing reactor 1; the second buffer tank 5 is used to balance the pressure fluctuations in the slurry receiving tank. Specifically:

[0084] In step 2) of the present invention, the pressure in the first buffer tank 4 can be, for example, 0~20MPaG, or optionally 0~10MPaG, 10~20MPaG, 0~5MPaG, 5~10MPaG, 10~15MPaG, or 15~20MPaG.

[0085] In step 2) of this invention, the pressure in the second buffer tank 5 can be, for example, 0~20 MPaG, and can be selected as 0~10 MPaG, 10~20 MPaG, 0~5 MPaG, 5~10 MPaG, 10~15 MPaG, or 15~20 MPaG. The pressure in the slurry receiving tank can be, for example, 0~20 MPaG, and can be selected as 0~10 MPaG, 10~20 MPaG, 0~5 MPaG, 5~10 MPaG, 10~15 MPaG, or 15~20 MPaG.

[0086] In step 2) of the present invention, nitrogen gas is introduced into the second buffer tank 5 so that the pressure in the second buffer tank 5 is greater than the pressure of the first receiving tank 3 and / or the second receiving tank 6; the first buffer tank 4 and the slurry heating and pressurizing vessel 1 are connected, and the second buffer tank 5 and the first receiving tank 3 and / or the second receiving tank 6 are connected.

[0087] In the method provided by this embodiment of the invention, step 3) involves introducing the high-temperature, high-pressure slurry from step 1) into the slurry testing pipeline 2 and receiving it in the slurry receiving tank; recording the testing time, the pressure drop at the inlet and outlet of the slurry testing pipeline 2, measuring the slurry volume in the slurry receiving tank, and calculating the slurry viscosity based on the slurry volume, testing time, and pressure drop at the inlet and outlet of the slurry testing pipeline 2. Specifically:

[0088] In step 3) of the present invention, the first shut-off valve 11 and the feed shut-off valve 10 are opened; the high-temperature and high-pressure slurry is introduced into the slurry test pipeline 2 and received by the slurry receiving tank. When the temperature of the second thermometer 19 begins to rise, the first shut-off valve 11 is closed and the second shut-off valve 12 is opened at the same time, and the timer is started; after a certain period of time, the second shut-off valve 12 and the feed shut-off valve 10 are closed.

[0089] In step 3) of this invention, the volumetric flow rate is calculated based on the slurry volume and the testing time. Q is the volumetric flow rate; V is the slurry volume; t is the test time.

[0090] The flow velocity of the slurry in the slurry test pipe 2 is calculated based on the volumetric flow rate and the inner diameter of the slurry test pipe 2. Q is the volumetric flow rate, d is the inner diameter of the slurry test pipe 2, and v is the flow velocity.

[0091] Based on the flow velocity of the slurry in the slurry testing pipeline 2 and the pressure difference between the first pressure gauge 16 and the second pressure gauge 18, and according to Hagen-Poiseuille's law Q=πR, 4ΔP / (8μL) or Blasius formula Calculate the viscosity of the slurry under high temperature and high pressure.

[0092] Among them, the Hagen-Poiseuille equation (applicable to laminar flow) is Q=πR. 4 In ΔP / (8μL), Q is the flow rate / volume, R is the radius of slurry test line 2, R=d / 2, ΔP is the pressure drop between the inlet and outlet of slurry test line 2 (the pressure difference between the first pressure gauge 16 and the second pressure gauge 18), μ is the viscosity, and L is the length of the slurry test line. That is, viscosity... .

[0093] Furthermore, the Blasius formula (applicable to transition flows) Where f is the Darcy friction factor and Re is the Reynolds number. .

[0094] Darcy-Weisbach formula (pressure loss formula):

[0095] Summarized as follows: Where μ is viscosity, ρ is fluid density, v is flow velocity, d is inner diameter of slurry test pipe 2, L is pipe length, and ΔP is pressure drop at the inlet and outlet of slurry test pipe 2 (pressure difference between first pressure gauge 16 and second pressure gauge 18).

[0096] The beneficial effects of the present invention will be further illustrated below with reference to the embodiments.

[0097] To make the inventive objectives, technical solutions, and beneficial effects of this invention clearer, the invention is further described in detail below with reference to embodiments. However, it should be understood that the embodiments of this invention are merely for illustrative purposes and not for limiting the invention, and the embodiments are not limited to those given in the specification. Unless otherwise specified, specific experimental or operational conditions in the embodiments were prepared under conventional conditions or according to the conditions recommended by the material supplier.

[0098] Furthermore, it should be understood that the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps, does not preclude the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps, unless otherwise stated. It should also be understood that the combined connection relationship between one or more devices / apparatus mentioned in this invention does not preclude the existence of other devices / apparatus before or after the combined devices / apparatus, or the insertion of other devices / apparatus between these explicitly mentioned devices / apparatus, unless otherwise stated. Moreover, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not for limiting the order of the method steps or limiting the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0099] In the following embodiments, unless otherwise specified, all the raw materials of the present invention are commercially available or prepared according to conventional methods in the art.

[0100] Equipment parameters:

[0101] Slurry test pipe 2 inner diameter: 2mm;

[0102] Slurry test pipeline 2 turns: 8 turns;

[0103] Slurry testing pipeline, 2 loops, diameter: 1.2m;

[0104] Test tube length: 30.1m.

[0105] Example 1

[0106] 1. Add the slurry to be tested to the slurry heating and pressurizing vessel 1, heat it to the test temperature (temperature is 120℃), and add nitrogen to the test pressure (pressure is 661200PaG); heat the slurry test pipeline 2 to the test temperature through the electric heating tape 14;

[0107] 2. Nitrogen gas is introduced into the first buffer tank 4 so that the pressure in the first buffer tank 4 (pressure is 661260 PaG) is slightly greater than the pressure in the slurry heating and pressurizing vessel 1;

[0108] 3. Fill the first receiving tank 3 and the second receiving tank 6 with nitrogen gas;

[0109] 4. Nitrogen gas is introduced into the second buffer tank 5 so that the pressure in the second buffer tank 5 (pressure is 640220 PaG) is slightly greater than that in the first receiving tank 3 (pressure is 640200 PaG) and / or the pressure in the second receiving tank 6 (pressure is 640200 PaG).

[0110] 5. Connect the first buffer tank 4 and the slurry heating and pressurizing vessel 1, and connect the second buffer tank 5 and the first receiving tank 3 and / or the second receiving tank 6.

[0111] 6. Open the first shut-off valve 11 and the feed shut-off valve 10; when the temperature of the second thermometer 19 begins to rise, close the first shut-off valve 11 and open the second shut-off valve 12 at the same time, and start timing; after a certain period of time, close the second shut-off valve 12 and close the feed shut-off valve 10.

[0112] 7. Measure the volume of slurry in the second receiving tank 6, and calculate the slurry viscosity based on the slurry volume, test time, pressure of the first pressure gauge 16, and pressure of the second pressure gauge 18.

[0113] The slurry concentration is 35 g / L (methanol slurry containing oxalamide, D50 = 66.25 μm).

[0114] Slurry temperature: 120℃;

[0115] Test duration: 60 seconds;

[0116] Inlet pressure of slurry test pipeline 2: 661260 PaG;

[0117] Slurry test pipeline 2 outlet pressure: 640-220 PaG;

[0118] Second receiving tank 6 slurry volume: 62ml;

[0119] The viscosity of the slurry was calculated to be 0.266 mPa·s using the Hagen-Poiseuille equation.

[0120] Example 2

[0121] 1. Add the slurry to be tested to the slurry heating and pressurizing vessel 1, heat it to the test temperature (temperature is 120℃), and add nitrogen to the test pressure (pressure is 672200PaG); heat the slurry test pipeline 2 to the test temperature through the electric heating tape 14;

[0122] 2. Nitrogen gas is introduced into the first buffer tank 4 so that the pressure in the first buffer tank 4 (pressure is 672250PaG) is slightly greater than the pressure in the slurry heating and pressurizing vessel 1;

[0123] 3. Fill the first receiving tank 3 and the second receiving tank 6 with nitrogen gas;

[0124] 4. Nitrogen gas is introduced into the second buffer tank 5 so that the pressure in the second buffer tank 5 (pressure is 650-180 PaG) is slightly greater than that in the first receiving tank 3 (pressure is 650-100 PaG) and / or the pressure in the second receiving tank 6 (pressure is 650-100 PaG).

[0125] 5. Connect the first buffer tank 4 and the slurry heating and pressurizing vessel 1, and connect the second buffer tank 5 and the first receiving tank 3 and / or the second receiving tank 6.

[0126] 6. Open the first shut-off valve 11 and the feed shut-off valve 10; when the temperature of the second thermometer 19 begins to rise, close the first shut-off valve 11 and open the second shut-off valve 12 at the same time, and start timing; after a certain period of time, close the second shut-off valve 12 and close the feed shut-off valve 10.

[0127] 7. Measure the volume of slurry in the second receiving tank 6, and calculate the slurry viscosity based on the slurry volume, test time, pressure of the first pressure gauge 16, and pressure of the second pressure gauge 18.

[0128] Slurry concentration: 50 g / L (methanol slurry containing oxalamide, D50 = 66.25 μm);

[0129] Slurry temperature: 120℃;

[0130] Test duration: 60 seconds;

[0131] Inlet pressure of slurry test pipeline 2: 672250 PaG;

[0132] Slurry test pipeline 2 outlet pressure: 650-180 PaG;

[0133] Second receiving tank 6 slurry volume: 61ml;

[0134] The viscosity of the slurry was calculated to be 0.283 mPa·s using the Hagen-Poiseuille equation.

[0135] Example 3

[0136] 1. Add the slurry to be tested to the slurry heating and pressurizing vessel 1, heat it to the test temperature (temperature is 120℃), and add nitrogen to the test pressure (pressure is 675200PaG); heat the slurry test pipeline 2 to the test temperature through the electric heating tape 14;

[0137] 2. Nitrogen gas is introduced into the first buffer tank 4 so that the pressure in the first buffer tank 4 (pressure is 675260 PaG) is slightly greater than the pressure in the slurry heating and pressurizing vessel 1;

[0138] 3. Fill the first receiving tank 3 and the second receiving tank 6 with nitrogen gas;

[0139] 4. Nitrogen gas is introduced into the second buffer tank 5 so that the pressure in the second buffer tank 5 (pressure of 651110 PaG) is slightly greater than that in the first receiving tank 3 (pressure of 651100 PaG) and / or the pressure in the second receiving tank 6 (pressure of 651100 PaG).

[0140] 5. Connect the first buffer tank 4 and the slurry heating and pressurizing vessel 1, and connect the second buffer tank 5 and the first receiving tank 3 and / or the second receiving tank 6.

[0141] 6. Open the first shut-off valve 11 and the feed shut-off valve 10; when the temperature of the second thermometer 19 begins to rise, close the first shut-off valve 11 and open the second shut-off valve 12 at the same time, and start timing; after a certain period of time, close the second shut-off valve 12 and close the feed shut-off valve 10.

[0142] 7. Measure the volume of slurry in the second receiving tank 6, and calculate the slurry viscosity based on the slurry volume, test time, pressure of the first pressure gauge 16, and pressure of the second pressure gauge 18.

[0143] Slurry concentration: 100g / L (methanol slurry containing oxalamide, D50=66.25μm);

[0144] Slurry temperature: 120℃;

[0145] Test duration: 60 seconds;

[0146] Inlet pressure of slurry test pipeline 2: 675260 PaG;

[0147] Slurry test pipeline 2 outlet pressure: 651110 PaG;

[0148] Slurry receiving tank slurry volume: 58ml;

[0149] The viscosity of the slurry was calculated to be 0.326 mPa·s using the Hagen-Poiseuille equation.

[0150] Example 4

[0151] 1. Add the slurry to be tested to the slurry heating and pressurizing vessel 1, heat it to the test temperature (temperature is 120℃), and add nitrogen to the test pressure (pressure is 652300PaG); heat the slurry test pipeline 2 to the test temperature through the electric heating tape 14;

[0152] 2. Nitrogen gas is introduced into the first buffer tank 4 so that the pressure in the first buffer tank 4 (pressure is 652330PaG) is slightly greater than the pressure in the slurry heating and pressurizing vessel 1;

[0153] 3. Fill the first receiving tank 3 and the second receiving tank 6 with nitrogen gas;

[0154] 4. Nitrogen gas is introduced into the second buffer tank 5 so that the pressure in the second buffer tank 5 (pressure is 630810 PaG) is slightly greater than that in the first receiving tank 3 (pressure is 630800 PaG) and / or the pressure in the second receiving tank 6 (pressure is 630800 PaG).

[0155] 5. Connect the first buffer tank 4 and the slurry heating and pressurizing vessel 1, and connect the second buffer tank 5 and the first receiving tank 3 and / or the second receiving tank 6.

[0156] 6. Open the first shut-off valve 11 and the feed shut-off valve 10; when the temperature of the second thermometer 19 begins to rise, close the first shut-off valve 11 and open the second shut-off valve 12 at the same time, and start timing; after a certain period of time, close the second shut-off valve 12 and close the feed shut-off valve 10.

[0157] 7. Measure the volume of slurry in the second receiving tank 6, and calculate the slurry viscosity based on the slurry volume, test time, pressure of the first pressure gauge 16, and pressure of the second pressure gauge 18.

[0158] Methanol temperature: 120℃;

[0159] Test duration: 60 seconds;

[0160] Inlet pressure of slurry test pipeline 2: 652330 PaG;

[0161] Slurry test pipeline 2 outlet pressure: 630-810 PaG;

[0162] Methanol volume in slurry receiving tank: 74 ml;

[0163] The viscosity of methanol was calculated to be 0.228 mPa·s using the Hagen-Poiseuille equation.

[0164] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0165] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the method of the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An apparatus for testing the viscosity of slurry under high temperature and high pressure, characterized in that, The device includes a slurry heating and pressurizing vessel (1), a slurry testing pipeline (2), and a slurry receiving tank, which are connected in sequence according to the slurry flow direction; It also includes a first buffer tank (4) for maintaining a constant pressure in the slurry heating and pressurizing vessel (1); the first buffer tank (4) and the slurry heating and pressurizing vessel (1) are connected in the gas phase space; It also includes a second buffer tank (5) for maintaining a constant pressure in the slurry receiving tank; the second buffer tank (5) and the slurry receiving tank are in gas phase space communication.

2. The apparatus for testing the viscosity of slurry under high temperature and high pressure as described in claim 1, characterized in that, The slurry heating and pressurizing vessel (1) is equipped with a stirring unit (22); the slurry receiving tank is equipped with a cooling unit.

3. The apparatus for testing the viscosity of slurry under high temperature and high pressure as described in claim 1, characterized in that, The slurry receiving tank includes a first receiving tank (3) and a second receiving tank (6); the first receiving tank (3) and the second receiving tank (6) are arranged in parallel, and the gas phase space of the first receiving tank (3) and the second receiving tank (6) are respectively connected to the second buffer tank (5).

4. The apparatus for testing the viscosity of slurry under high temperature and high pressure as described in claim 3, characterized in that, The device further includes one or more of the following conditions: A1) The first receiving tank (3) is equipped with a first weighing module (20); A2) The second receiving tank (6) is equipped with a second weighing module (21); A3) A first condenser (8) is provided on the connecting pipe between the second buffer tank (5) and the first receiving tank (3); A4) A second condenser (9) is provided on the connecting pipe between the second buffer tank (5) and the second receiving tank (6). A5) A third condenser (7) is provided on the connecting pipeline between the slurry heating and pressurizing kettle (1) and the first buffer tank (4).

5. The apparatus for testing the viscosity of slurry under high temperature and high pressure as described in claim 3, characterized in that, The device further includes one or more of the following conditions: B1) A first shut-off valve (11) is provided on the connecting pipeline between the slurry test pipeline (2) and the first receiving tank (3). B2) A second shut-off valve (12) is provided on the connecting pipeline between the slurry test pipeline (2) and the second receiving tank (6).

6. The apparatus for testing the viscosity of slurry under high temperature and high pressure as described in claim 1, characterized in that, The device further includes one or more of the following conditions: C1) The inlet of the slurry test pipeline (2) is equipped with a first pressure gauge (16) and a first thermometer (17). C2) The outlet of the slurry test pipeline (2) is equipped with a second pressure gauge (18) and a second thermometer (19). C3) The inlet of the slurry test pipeline (2) is equipped with a feed shut-off valve (10).

7. The apparatus for testing the viscosity of slurry under high temperature and high pressure as described in claim 1, characterized in that, The slurry test pipeline (2) is a single-loop multi-layer type. The inlet of the slurry test pipeline (2) is located at the uppermost end of the slurry test pipeline (2), and the outlet of the slurry test pipeline (2) is located at the lowermost end of the slurry test pipeline (2).

8. The apparatus for testing the viscosity of slurry under high temperature and high pressure as described in claim 1, characterized in that, The slurry testing pipeline (2) is provided with an electric heating tape (14) on the outside; the slurry testing pipeline (2) and the electric heating tape (14) are together located in an insulated box (15).

9. A method for testing the viscosity of slurry under high temperature and high pressure, characterized in that, The method using the apparatus according to any one of claims 1 to 8 comprises the following steps: 1) Heat the slurry to be tested in the slurry heating and pressurizing kettle (1) to the test temperature, add nitrogen to the test pressure, and obtain high temperature and high pressure slurry; heat the slurry test pipeline (2) to the test temperature; 2) Nitrogen gas is introduced into the first buffer tank (4), the slurry receiving tank and the second buffer tank (5) respectively; so that the pressure in the first buffer tank (4) is greater than the pressure in the slurry heating and pressurizing kettle (1); so that the pressure in the second buffer tank (5) is greater than the pressure in the slurry receiving tank; connect the first buffer tank (4) and the slurry heating and pressurizing kettle (1), and connect the second buffer tank (5) and the slurry receiving tank; 3) Pass the high-temperature and high-pressure slurry from step 1) into the slurry test pipeline (2) and receive it in the slurry receiving tank; record the test time, the pressure drop at the inlet and outlet of the slurry test pipeline (2), measure the volume of slurry in the slurry receiving tank, and calculate the slurry viscosity based on the slurry volume, test time, and pressure drop at the inlet and outlet of the slurry test pipeline (2).

10. The method for testing the viscosity of slurry under high temperature and high pressure as described in claim 9, characterized in that, The method also includes one or more of the following conditions: In step 1) of D1), the test temperature is 40~300℃; In step 1) of D2), the pressure to be measured is 0~20MPaG; In step 1) of D3), the slurry test pipeline (2) is heated to the test temperature by the electric heating tape (14); In step 2) of D4), the pressure in the first buffer tank (4) is 0~20MPaG; In step 2) of D5, the pressure in the second buffer tank (5) is 0~20MPaG; In step 2) of D6), the pressure in the slurry receiving tank is 0~20MPaG; In step 2) of D7, nitrogen gas is introduced into the second buffer tank (5) so that the pressure in the second buffer tank (5) is greater than the pressure of the first receiving tank (3) and / or the second receiving tank (6); the first buffer tank (4) and the slurry heating and pressurizing kettle (1) are connected, and the second buffer tank (5) and the first receiving tank (3) and / or the second receiving tank (6) are connected. In step 3 of D8, the first shut-off valve (11) and the feed shut-off valve (10) are opened; the high-temperature and high-pressure slurry is introduced into the slurry test pipeline (2) and received by the slurry receiving tank. When the temperature of the second thermometer (19) begins to rise, the first shut-off valve (11) is closed and the second shut-off valve (12) is opened at the same time and the timer is started; after a certain time, the second shut-off valve (12) and the feed shut-off valve (10) are closed. In step 3) of D9, the viscosity of the slurry under high temperature and high pressure is obtained according to the Hagen-Poiseuille law; ,in, μ is the viscosity, R is the radius of the slurry test pipeline, R=d / 2, d is the inner diameter of the slurry test pipeline, ΔP is the pressure drop at the inlet and outlet of the slurry test pipeline, L is the length of the slurry test pipeline, Q is the volumetric flow rate, V is the slurry volume, and t is the test time. In step 3) of D10, the viscosity of the slurry under high temperature and high pressure is obtained according to the Blasius formula and the Darcy-Weisbach formula. Where μ is viscosity, ρ is fluid density, v is flow velocity, d is inner diameter of slurry test pipeline, L is pipeline length, and ΔP is pressure drop at the inlet and outlet of slurry test pipeline.

Images