CN102353615A - Measuring apparatus and measuring method for dispersivity of piled granular substances - Google Patents

Abstract

The present invention relates to a particle accumulation dispersion measurement device and a measurement method, wherein the particle dispersion measurement device has a rectangular test container with an inlet and outlet, the outlet of the test container is connected with a suction pump, and the test container has a test cavity , the chamber walls at both ends of the test chamber are covered with tiny meshes, and the part of the test chamber close to the exit is provided with a sieve with sponge filling, a buffer chamber between the test chamber and the exit, and a buffer chamber between the test chamber and the entrance. There is also a buffer chamber in between, and two baffles are arranged at the part opposite to the entrance of the test chamber; the bottom of the test container is transparent, and a laser scanning imaging device is installed on the bottom of the test container, and an opaque light-shielding cover is provided on the upper part of the test container. The suction pump and the laser scanning imaging device are connected to the signal output connector through the signal transmission line. The invention can measure the dispersing ability of particle deposits under the impact of laminar flow fluid, and provides an evaluation method for the flow ability of particles.

Description

Measuring device and method for particle accumulation dispersion

1. Technical field:

The invention relates to a device for evaluating the flow performance of particle deposits, in particular to a device and method for measuring the dispersion of particle deposits under the impact of laminar flow state fluid.

2. Background technology:

The existing measurement equipment for the flowability of solid accumulation materials is mainly used in the measurement of powder flowability, mainly to measure the value of the angle of repose of the powder, and then evaluate the flowability of the powder according to the value of this parameter. Currently, there is no device for measuring the flow properties of particle deposits in fluid media. The specific concept of dispersibility is the dispersibility of particle accumulations under the impact of other fluid media, and the value of dispersibility is used to evaluate the flow ability of particle accumulations.

,

为流体密度，

为流体动力粘度，

为流场的速度，

为流场的特征长度。

，流体为紊流流动，

，为过渡状态，

，流体为层流流动。通过调整流体的密度、粘度、速度可以改变流体的流动状态。 The parameter to judge the fluid flow state is called Reynolds number.

,

is the fluid density,

is the hydrodynamic viscosity,

is the velocity of the flow field,

is the characteristic length of the flow field.

, the fluid is a turbulent flow,

, for the transition state,

, the fluid is laminar flow. The flow state of the fluid can be changed by adjusting the density, viscosity, and speed of the fluid.

3. Contents of the invention:

The object of the present invention is to provide a particle accumulation dispersion measurement device, which is used to solve the problem that the prior art cannot measure the flow performance of the particle accumulation in a fluid medium. Another purpose of the present invention is to provide the particle accumulation dispersion The measuring method of the measuring device.

The technical scheme adopted by the present invention to solve its technical problems is: the particle dispersion measurement device has a rectangular test container with an inlet and outlet, the outlet of the test container is connected with a suction pump, the test container has a test chamber, and the test chamber The walls of the chamber at both ends of the test chamber are covered with tiny meshes. A sieve with a sponge filling is set near the exit of the test chamber. There is a buffer chamber between the test chamber and the exit, and there is also a A buffer chamber, two baffles are installed at the part opposite to the entrance of the test chamber; the bottom of the test container is transparent, a laser scanning imaging device is installed on the bottom of the test container, an opaque light-shielding cover is provided on the top of the test container, and the suction pump 1. The laser scanning imaging device is connected to the signal output joint through the signal transmission line.

In the above scheme, the length of the test container is 1-5 meters, the depth of the test chamber is 0.2-0.4 meters, and the width is 0.6-0.9 meters; the height of the baffle is 0.2-0.4 meters, the length is 0.2-0.4 meters, and the width between the two baffles is 0.1 ~0.2 meters.

In the above solution, the inlet of the test container is connected to the liquid storage tank, a regulating valve is installed at the inlet of the test container, and the outlet of the suction pump is connected to another liquid storage tank.

In the above solution, the signal output connector is connected to the computer.

The measurement method of the above particle dispersion measuring device:

1. Temporarily close the entrance of the test container, fill the test container with water, accumulate the particles between the two baffles, and arrange them into a regular rectangle with a flat surface, and measure the height H of the accumulation;

的流体进行抽吸，使流体的流动速度达到0.5~0.8m/s，此时流体的流动状态为层流流态，盖上遮光盖子，对颗粒堆积物进行5-10分钟的冲击；由于流体的冲击作用，一部分颗粒物被流体冲出挡板处，这部分颗粒物沉淀在测试容器底面上，构成具有一定面积的图形形状，放出测试容器内流体； 2. Open the entrance of the test container, start and adjust the suction speed of the suction pump, the density is 1.0~1.2g/cm ³ , and the dynamic viscosity is 50~70

Suction the fluid so that the flow velocity of the fluid reaches 0.5~0.8m/s. At this time, the flow state of the fluid is a laminar flow state. Cover the shading cover and impact the particle accumulation for 5-10 minutes; because the fluid Part of the particles are washed out of the baffle by the fluid, and this part of the particles settles on the bottom surface of the test container, forming a graphic shape with a certain area, and releasing the fluid in the test container;

3. Use a laser scanning imaging device to scan and image the irregular shape formed by the dispersion of particles in the test container on the computer, calculate the area S of the dispersed shape of the particles and the volume V of the particles washed out from the baffle, and remove the remaining particles in the baffle The surface of the particle accumulation is leveled, the height value h is measured, the particle dispersion=(H-h)*(S/V)/H, and the measurement result is displayed on the computer.

Beneficial effect:

1. The present invention can measure the dispersion ability of particle accumulation under the impact of laminar fluid, and provides an evaluation method for the flow ability of particles.

2. The present invention can form a flow field with a uniform velocity distribution on the fluid cross section in the test chamber, and scan the plane dispersion pattern formed by the particle accumulation after being impacted by the fluid, providing a new method for evaluating the dynamic flow capacity of the particle accumulation. Technical method.

4. Description of drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the sectional view of Fig. 1;

Figure 3 is a schematic diagram of the use state.

1 Test container 2 Suction pump 3 Test chamber 4 Sieve 5 Buffer chamber 6 Baffle 7 Cover 8 Laser scanning imaging device 9 Liquid storage tank 10 Liquid storage tank.

5. Specific implementation methods:

Below in conjunction with accompanying drawing, the present invention will be further described:

As shown in Fig. 1 and Fig. 2, this particle dispersion measurement device has a test container 1, the test container 1 is a rectangular container with an inlet and outlet, the outlet of the rectangular container is connected to the suction pump 2, and the rectangular container has a test chamber Body 3, the cavity walls at both ends of the test cavity 3 are covered with small meshes, and the test cavity 3 near the exit is provided with a sieve 4 with sponge filling, between the sieve 4 and the wall of the test cavity 3 A buffer chamber 5 is formed between the test chamber 3 and the outlet, and there is also a buffer chamber 5 between the test chamber 3 and the inlet; since there is a buffer chamber at both ends of the test chamber 3, the fluid can enter the test The uneven areas at both ends of the container 1 are separated, so that a stable and uniform flow field is formed in the test chamber 3, and the outlet of the test chamber 3 has two buffer chambers, which can slowly release the suction force of the suction pump 2 , to ensure that the test chamber 3 forms a stable and uniform pressure drop flow field; the part of the test chamber 3 opposite to the inlet is provided with two parallel baffles 6, and the particles between the two baffles 6 are used to accumulate test particles. It communicates with the inlet. When the suction pump 2 sucks the fluid, the fluid impacts the particles between the baffles 6 to disperse the particles into the test chamber 3; the bottom of the test container 1 is transparent, and the bottom of the test container 1 is set There is a laser scanning imaging device 8, which can scan the plane dispersion pattern formed by the particle accumulation after being impacted by the fluid; the upper part of the test container 1 has an opaque light-shielding cover 7, and the cover 7 can play a sealing role. The suction pump 2, laser The scanning imaging device 8 is connected to the signal acquisition and transmission card through the signal transmission line, and the signal acquisition card is installed on the computer.

The chamber walls at both ends of the test chamber 3 are covered with fine meshes, which can balance the flow velocity distribution on the fluid flow section; the sieves of the test chamber 3 can prevent the loss of particles.

The test container 1 of the present invention has a length of 1 to 5 meters, a test cavity 3 with a height of 0.2 to 0.4 meters and a width of 0.6 to 0.9 meters, and a baffle plate 6 for containing particulate matter with a height of 0.2 to 0.4 meters, a width of 0.1 to 0.2 meters, and a length of 0.2 to 0.2 meters. 0.4 meters.

Dispersion is the dispersibility of particle accumulations under the impact of other fluid media, and the flow ability of particle accumulations is evaluated by using the value of dispersion.

When the present invention measures the dispersion of particulate matter, as shown in Figure 3, it is necessary to connect the liquid storage tank 9 containing the fluid with the inlet of the test container 1, install a regulating valve at the inlet, and connect the outlet of the suction pump 2 to another storage tank. The liquid tank 10 sucks the fluid in the tank through the suction pump 2, impacts the particles at the baffle plate 6, obtains the dispersed shape of the particles, and performs analysis and processing. The specific measurement method is as follows:

（毫帕秒）之间，将流体储存在储液箱9中；暂时关闭流体入口，向测试容器1内放满水，将一定体积的颗粒物放在测试容器1内的两块挡板6间，把颗粒物表面处理平整，测量堆积物高度H；打开测试容器1入口，启动并调节抽吸泵2抽吸速度，对密度为1.0~1.2g/cm³、动力粘度为50~70的流体进行抽吸，使流体的流动速度达到0.5~0.8m/s，此时流体的流动状态为层流流态，盖上遮光盖子7，对颗粒堆积物进行5-10分钟的冲击，经过5-10分钟的流体冲击后，一部分颗粒物向测试腔体3内弥散成不规则形状，放出测试容器1内的流体；使用激光扫描成像装置8，将测试腔体3内颗粒物弥散形成的不规则的形状扫描成像在电脑中，计算颗粒物弥散形状的面积S及从挡板6处弥散出的颗粒的体积V，将挡板6间剩余的颗粒堆积物表面整平，测量高度值h，从而得到，颗粒弥散度=(H-h)*(S/V)/H。 First, prepare the fluid required for the test so that the fluid density is between 1.0~1.2g/cm ³ and the dynamic viscosity of the fluid is 30~70

(MilliPascal seconds), store the fluid in the liquid storage tank 9; temporarily close the fluid inlet, fill the test container 1 with water, and put a certain volume of particles between the two baffles 6 in the test container 1 , smooth the surface of the particles, measure the height H of the accumulation; open the inlet of the test container 1, start and adjust the suction speed of the suction pump 2, for a density of 1.0~1.2g/cm ³ and a dynamic viscosity of 50~70 The fluid is pumped to make the flow velocity of the fluid reach 0.5~0.8m/s. At this time, the flow state of the fluid is laminar flow state. Cover the light-shielding cover 7 and impact the particle accumulation for 5-10 minutes. After 5-10 minutes of fluid impact, a part of the particles diffuse into the test chamber 3 into an irregular shape, and the fluid in the test container 1 is released; the laser scanning imaging device 8 is used to disperse the irregular particles formed in the test chamber 3 Scanning and imaging the shape of the particles in the computer, calculating the area S of the dispersed shape of the particles and the volume V of the particles dispersed from the baffle 6, leveling the surface of the remaining particle accumulation between the baffles 6, and measuring the height value h, thus obtaining , particle dispersion=(Hh)*(S/V)/H.

The particle diameter of the present invention is between 2mm-5cm.

Claims (5)

1. A particle dispersion measuring device, characterized in that: this particle dispersion measuring device has a rectangular test container (1) with an inlet and outlet, and the outlet of the test container (1) is connected with a suction pump (2), The test container (1) has a test cavity (3), the cavity wall at both ends of the test cavity (3) is covered with fine meshes, and the test cavity (3) is equipped with a sponge filling material near the outlet. Sieve (4), between the test chamber (3) and the outlet is a buffer chamber (5), there is also a buffer chamber (5) between the test chamber (3) and the entrance, the test chamber (3) is opposite to the entrance There are two baffles (6) on the part of the test container (1); the bottom of the test container (1) is transparent, the lower part of the test container (1) is equipped with a laser scanning imaging device (8), and the upper part of the test container (1) is equipped with an opaque light-shielding The cover (7), the suction pump (2), and the laser scanning imaging device (8) are connected to the signal output connector through the signal transmission line. 2. The particle dispersion measurement device according to claim 1, characterized in that: the test container (1) has a length of 1-5 meters, the test cavity (3) has a depth of 0.2-0.4 meters and a width of 0.6-0.9 meters ; The height of the baffle (6) is 0.2-0.4 meters, the length is 0.2-0.4 meters, and the width between the two baffles (6) is 0.1-0.2 meters. 3. The particle dispersion measuring device according to claim 2, characterized in that: the inlet of the test container (1) is connected to the liquid storage tank (9), and a regulating valve is installed at the inlet of the test container (1), and the suction The outlet of the pump (2) is connected to another reservoir (10). 4. The particle dispersion measuring device according to claim 3, characterized in that: said signal output connector is connected to a computer. 5. A measuring method of the particle dispersion measuring device according to claim 1 or 2 or 3 or 4, characterized in that: its measuring method is, 1. Temporarily close the entrance of the test container (1), fill the test container (1) with water, accumulate the particles between the two baffles (6), and arrange them into a regular rectangle with a flat surface, measure the height H of the accumulation ; 2. Open the inlet of the test container (1), start and adjust the suction speed of the suction pump (2), the density is 1.0~1.2g/cm ³ , the dynamic viscosity is 50~70

Suction the fluid so that the flow velocity of the fluid reaches 0.5~0.8m/s. At this time, the flow state of the fluid is a laminar flow state. Cover the light-shielding cover (7) and impact the particle accumulation for 5-10 minutes. ;Due to the impact of the fluid, a part of the particles is washed out of the baffle (6) by the fluid, and this part of the particles settles on the bottom surface of the test container (1), forming a graphic shape with a certain area, and releasing the fluid in the test container (1); 3. Use the laser scanning imaging device (8) to scan and image the irregular shape formed by the dispersion of particles in the test container (1) in the computer, calculate the area S of the dispersion shape of the particles and the particles washed out from the baffle (6) Volume V, level the surface of the remaining particle accumulation in the baffle (6), measure the height value h, particle dispersion=(H-h)*(S/V)/H, and the computer displays the measurement result.

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