CN111595744B - Device and method for adding solid particles into gas-phase jet flow - Google Patents
Device and method for adding solid particles into gas-phase jet flow Download PDFInfo
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- CN111595744B CN111595744B CN202010517163.2A CN202010517163A CN111595744B CN 111595744 B CN111595744 B CN 111595744B CN 202010517163 A CN202010517163 A CN 202010517163A CN 111595744 B CN111595744 B CN 111595744B
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- 239000002245 particle Substances 0.000 title claims abstract description 94
- 239000007787 solid Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims description 14
- 238000003756 stirring Methods 0.000 claims abstract description 43
- 238000012806 monitoring device Methods 0.000 claims abstract description 13
- 239000008247 solid mixture Substances 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000005243 fluidization Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000917 particle-image velocimetry Methods 0.000 description 2
- 230000005514 two-phase flow Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
- G01N2001/386—Other diluting or mixing processes
- G01N2001/388—Other diluting or mixing processes mixing the sample with a tracer
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- Health & Medical Sciences (AREA)
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- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
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Abstract
The invention discloses a device for adding solid particles into gas-phase jet flow, which comprises a gas supply system for inputting the gas-phase jet flow, a spiral feeding system for inputting the particles, a fluidized reactor and a microwave monitoring device, wherein the gas supply system is used for supplying the gas-phase jet flow; the side wall of the bottom of the fluidized reactor is provided with a nozzle, and the top of the fluidized reactor is provided with a feeding port and a discharging port; the nozzle is connected with a gas supply system, the feeding port is connected with a feeding system, and two microwave monitoring devices are arranged at the discharging port; the central axis inside the fluidized reactor is provided with a stirring paddle, the stirring paddle is driven by a stirring motor to rotate, and the stirring paddle is provided with a plurality of layers of blades. The invention adopts double microwave detectors to monitor the concentration of solid particles at the outlet in real time, so that the concentration of the gas-solid mixture at the outlet of the device is uniform and stable; the invention combines the spiral feeding and stirring device, not only can realize the addition of large particles, but also can realize the stable and controllable concentration of small-sized solid particles.
Description
Technical Field
The invention relates to a device and a method for adding solid particles into gas-phase jet flow, and belongs to the field of multiphase flow testing.
Background
In gas-solid two-phase jets, the concentration of solid particles is one of the important factors affecting the turbulent flow of gas-solid. On the other hand, in Particle Image Velocimetry (PIV), the addition of tracer particles directly affects the accuracy of the measurement results. At present, the methods for adding solid particles in gas phase jet flow are mainly screw feeding method and pneumatic conveying method.
The spiral feeding method adopts a spiral feeder to directly press solid particles into a pipeline of gas jet, when the size of the added solid particles is smaller (< 20 mu m), the idling of the spiral feeder and particle agglomeration can occur, and simultaneously, because the gas pressure in gas phase jet is higher, the reverse flow of particles and other phenomena occur in the spiral feeding process.
The pneumatic conveying method is that gas flows through a storage chamber with fixed amount, and certain solid particles are carried by the gas to form gas-solid jet flow. The method has a small application range, has a good effect only on micron-sized fine particles, and is difficult to control the particle concentration.
Therefore, the stable and controllable addition of solid particles in gas phase jet flow is always a difficult and challenging point in the field of gas-solid two-phase flow testing.
Disclosure of Invention
The invention aims to: the invention aims to provide a device and a method for adding solid particles into gas phase jet flow, which are sufficient in mixing and high in measurement precision.
The technical scheme is as follows: the invention relates to a device for adding solid particles into gas-phase jet, which comprises a gas supply system for inputting gas-phase jet, a spiral feeding system for inputting particles, a fluidized reactor and a microwave monitoring device, wherein the gas supply system is used for supplying gas-phase jet; the side wall of the bottom of the fluidized reactor is provided with a nozzle, and the top of the fluidized reactor is provided with a feeding port and a discharging port; the nozzle is connected with a gas supply system, the feeding port is connected with a feeding system, two microwave monitoring devices are arranged at the discharging port, and each detection device comprises a microwave generator and a microwave receiver arranged at the rear end of the generator; the inside axis department of fluidized reactor is equipped with the stirring rake, and the stirring rake is rotatory under agitator motor's drive, is equipped with the multilayer blade on the stirring rake, and the blade cross-section is the arc of kickup, and every layer of blade rotational speed is different.
The length of the blade in the horizontal direction is firstly reduced and then increased from top to bottom. The blade is provided with at least 6 layers. The rotating speed of each layer of blades is decreased from top to bottom in sequence.
An included angle beta between a plane where a connecting line of the nozzle outlet and the central axis of the fluidized reactor is located and a vertical plane is 30-60 degrees, so that jet flow forms rotational flow in the fluidized reactor; the direction of rotation of the vanes is opposite to the direction of the swirling flow.
The included angles among the vertical planes where the connecting lines of the nozzle outlet and the discharge port and the stirring paddle are located are more than or equal to 60 degrees and less than or equal to 90 degrees.
The gas supply system comprises a gas source, an electromagnetic flowmeter arranged on the gas inlet pipeline and an electric valve.
The system also comprises a host which controls the operation of the spiral feeding system, the stirring motor and the electric valve by acquiring the information of the electromagnetic flowmeter and the microwave monitoring device.
The method for adding solid particles into gas phase jet flow is based on the device and is characterized by comprising the following steps:
(1) Setting the volume flow rate of the gas jet, the volume flow rate of the solid particles, the mass flow rate of the gas jet and the mass flow rate of the solid particles in the main machine according to the required particle concentration, and setting the rotating speed of the screw feeder and the rotating speed of the stirring motor according to the mass flow rate of the solid particles;
(2) Opening a feeding system, a gas supply system and a stirring paddle, and continuously feeding particles into the fluidized reactor through a feeding port by a spiral feeder;
(3) Gas enters from a nozzle at the lower end of the fluidized reactor to form jet flow, and particles are mixed with the jet flow and move upwards under the action of a stirring paddle;
(4) The particles added to the jet flow pass through a microwave generator and a microwave receiver at an outlet, and a host machine acquires microwave signals and judges whether the concentration of the gas-solid mixture meets the requirement or not;
(5) The host machine adjusts the rotation speeds of the spiral feeding motor and the stirring motor and adjusts the opening of the electric valve according to the judgment result in the step (4); if the judgment result is that the concentration exceeds the set concentration, the rotating speeds of the spiral feeding motor and the stirring motor are reduced, and the opening degree of the electric valve is increased; otherwise, the rotating speeds of the spiral feeding motor and the stirring motor are increased, and the opening degree of the electric valve is reduced.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) The invention adopts double microwave detectors to monitor the concentration of solid particles at the outlet in real time, so that the concentration of the gas-solid mixture at the outlet of the device is uniform and stable;
(2) The spiral feeding and stirring device is combined, so that large particles can be added, and the concentration of small solid particles (20 mu m) can be stably controlled;
(3) The invention adopts a real-time monitoring and real-time feedback system, realizes the adjustment of the concentration of the solid particles by adjusting the rotating speed of the spiral feeding motor, and can realize the full-automatic adjustment of the concentration of the given solid particles by adjusting the automatic valve, the spiral feeding motor and the stirring motor, so that the concentration of the solid particles added in the gas phase jet flow is more accurate and stable, and the invention is beneficial to the subsequent experimental research.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
figure 2 is a top view of a fluidized reactor of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, the present invention comprises a gas supply system for inputting gas phase jet, a spiral feeding system for inputting particles, a fluidized reactor 4, a microwave monitoring device and a main machine 12. The concrete structure is as follows:
the gas supply system comprises a gas source 16, an electric valve 1 and an electromagnetic flow meter 2. The spiral feeding system comprises a particle storage chamber 6, a spiral feeding port 7 and a spiral feeding motor 8. The microwave monitoring device comprises a microwave generator 10 and a microwave receiver 11.
The fluidized reactor 4 is provided with nozzles 3 at the bottom side wall and with a feed port 15 and a discharge port 14 at the top. The stirring paddle 5 is arranged on the central axis inside the fluidized reactor 4, the stirring paddle 6 is driven by the stirring motor 9 to rotate, the stirring paddle 5 is provided with a plurality of layers of blades 13, the cross sections of the blades 13 are in an arc shape which is bent upwards, and the rotating speed of each layer of blades 13 is different. The length of the blade 13 in the horizontal direction is first reduced from top to bottom and then increased, and the blade is in a shape that the upper layer is wide and the lower layer is narrow. The blades are at least provided with 6 layers, and the rotating speed of each layer of blades is gradually reduced from top to bottom. Thereby forming a staggered guide vane group with different rotating speeds, and the solid particles with given mass flow rate are thrown out to the boundary through the centrifugal force of the staggered guide vane. In this embodiment, an included angle β between a plane where a connecting line of an inlet of the nozzle and a central axis of the fluidized reactor is located and a vertical plane is 60 °, the nozzle is located at the left front end of the fluidized reactor, the jet forms an anticlockwise rotational flow in the fluidized reactor, at this time, the blade should rotate in a clockwise direction, and the particles are driven by the blade to move in a direction opposite to the jet, which is beneficial to mixing of gas and particles.
The nozzle 3 is connected with a gas supply system, the included angle theta between the vertical planes of the connecting lines of the outlet of the nozzle 3, the discharge hole 14 and the stirring paddle 5 is more than or equal to 60 degrees and less than or equal to 90 degrees, as shown in figure 2, initial gas enters the fluidization chamber through the jet nozzle in a tangential direction and is in strong anticlockwise rotational flow along the side wall of the fluidization chamber.
The spiral feed system is connected to feed inlet 15, and discharge gate department is equipped with two sets of microwave monitoring devices, and every detection device includes microwave generator 10 and locates the microwave receiver 11 of generator rear end, and a set of monitoring device is close to the export, and another group's detection device is apart from export detection device about 20cm to guarantee better monitoring effect. If the two sets of signals are consistent, it is proved that the gas and the particles are uniformly mixed, and if the difference between the signals is large, it is proved that the mixing is not good.
When the automatic valve is used, the automatic valve 1 is opened according to the given gas jet flow, the host 12 reads the readings of the electromagnetic flowmeter 2 in real time, and the opening of the automatic valve 1 is adjusted in real time according to the readings. And determining the mass flow rate of the solid particles in the gas-solid two-phase flow according to the given solid particle concentration and gas jet flow rate and the physical parameters (density, particle size and the like) of the solid particles. Meanwhile, the total mass of the solid particles required during the experiment is determined according to the time required for the experiment, thereby adding the determined solid particles to the particle storage chamber 6. Opening the spiral feeding motor 8 and the stirring motor 9, determining the rotating speed of the spiral feeding motor 8 according to the mass flow rate of the solid particles, and determining the rotating speed of the stirring motor 9 according to parameters such as the particle size, the density and the mass flow rate of the solid particles; the given solid particles are thoroughly mixed with the initial gas in the particle fluidization chamber and tangentially flow out of the discharge port 14.
The host 12 collects two groups of monitoring data at the outlet, the data comparison can observe whether the particle concentration is uniformly mixed or not and whether the flow of the gas-solid mixture is stable or not, when two groups of signals are basically consistent, the added particle concentration is considered to meet the requirement, and if the signals show that the particle concentration is lower, the rotating speeds of the spiral feeding motor 8 and the stirring motor 9 are accelerated; and if the signal shows that the particle concentration is higher, the rotating speed of the spiral feeding motor 8 and the stirring motor 9 is reduced.
The specific implementation method of the invention is as follows:
firstly, the microwave generating device 10, the microwave receiving device 11, the data collector 12 and the electromagnetic flow meter 2 are started, and no particles exist in the particle storage chamber 6 and the particle fluidizing chamber 4. The particles required for the test in this case are, for example, ultrafine particles of silica of 20 μm, the solids concentration required for the test in this case being c p (kg/m 3 ) Given the volumetric flow rate Q of the gas jet g (m 3 /s) at which the mass flow rate of the gas jet is ρ g Q g (kg/s), the volume flow rate Q of the solid particles is known s ＝c p Q g (m 3 /s) at which the mass flow rate of the solid particles is ρ p c p Q g (kg/s). The jet nozzle 3 has in this case an internal diameter d (m) at which the gas-phase jet exit velocity tangentially into the particle fluidization chamber is u g ＝4Q g /3πd 2 (m/s). The time required for the experimental measurement in this case is t(s), in which case the total mass m of solid particles required is p ＝tρ p c p Q g (kg), an appropriate amount of solid particles are stored in the particle storage chamber 6, and the particle storage chamber 6 is pressurized and sealed.
And opening the automatic valve 1 according to the required volume flow rate of the gas jet, reading the readings of the electromagnetic flowmeter 2 in real time, and adjusting the opening alpha of the automatic valve 1 in real time according to the readings. The spiral feeding motor 8 and the stirring motor 9 are opened, and the rotating speed omega of the spiral feeding motor 8 is determined according to the mass flow rate of the solid particles 1 (rad/s), determining the rotation speed omega of the stirring motor 9 according to the parameters of the particle diameter, the density, the mass flow rate and the like of the solid particles 2 (rad/s)。
Gas jet flow and solid particles enter the fluidization chamber from the lower part and the upper part of the particle fluidization chamber 4 respectively, are fully and uniformly mixed under the action of the staggered guide vanes and tangentially flow out from the upper gas-solid jet flow outlet 14, two groups of microwave monitoring devices arranged at the gas-solid jet flow outlet monitor particle concentration signals of a gas-solid mixture at the outlet respectively, whether the particle concentration is uniformly mixed or not and whether the flow of the gas-solid mixture is stable or not can be observed through the comparison of the two groups of monitoring signals, when the two groups of signals are basically consistent, the added particle concentration is considered to meet the requirement, and if the signals show that the particle concentration is lower, the rotating speeds of the spiral feeding motor 8 and the stirring motor 9 are accelerated; if the signal shows that the particle concentration is higher, the rotating speed of the spiral feeding motor 8 and the stirring motor 9 is reduced.
Claims (8)
1. A device for adding solid particles into gas-phase jet flow is characterized by comprising a gas supply system for inputting the gas-phase jet flow, a spiral feeding system for inputting particles, a fluidized reactor (4) and a microwave monitoring device; the side wall of the bottom of the fluidized reactor (4) is provided with a nozzle (3), and the top of the fluidized reactor is provided with a feeding port (15) and a discharging port (14); the nozzle (3) is connected with a gas supply system, the feeding port (15) is connected with the feeding system, two microwave monitoring devices are arranged at the discharge port (14), and each detection device comprises a microwave generator (10) and a microwave receiver (11) arranged at the rear end of the generator; a stirring paddle (5) is arranged on the central axis inside the fluidized reactor (4), the stirring paddle is driven by a stirring motor (9) to rotate, a plurality of layers of blades (13) are arranged on the stirring paddle (5), the sections of the blades (13) are in an upward-bent arc shape, and the rotating speed of each layer of blades is different; a plane where the connecting line of the outlet of the nozzle and the central axis of the fluidized reactor is located and a vertical plane form a certain included angle, and the included angle is beta, so that the jet flow forms rotational flow in the fluidized reactor; the rotation direction of the blades is opposite to the rotational flow direction; the value of the beta is 30-60 degrees.
2. The device for adding solid particles to a gas-phase jet according to claim 1, wherein the length of the blades (13) in the horizontal direction is first decreased and then increased from top to bottom.
3. Device for adding solid particles to a gas-phase jet according to claim 1, characterized in that said blades (13) are provided with at least 6 layers.
4. The device for adding solid particles into a gas-phase jet according to claim 1, characterized in that the rotating speed of each layer of blades (13) is gradually reduced from top to bottom.
5. The device for adding solid particles into a gas-phase jet according to claim 1, characterized in that the included angle between the vertical plane on which the outlet of the nozzle (3), the discharge hole (14) and the stirring paddle (5) are connected is theta, and theta is greater than or equal to 60 degrees and less than or equal to 90 degrees.
6. Device for adding solid particles to a gas-phase jet according to claim 1, characterized in that the gas supply system comprises a gas source (16), an electromagnetic flow meter (2) and an electric valve (1) arranged on the gas inlet line.
7. The device for adding solid particles into gas-phase jet flow according to claim 1 or 5, characterized by further comprising a main machine (12), wherein the main machine (12) controls the operation of the spiral feeding system, the stirring motor (9) and the electric valve (1) by acquiring information of the electromagnetic flow meter (2) and the microwave monitoring device.
8. A method for adding solid particles to a gas phase jet, based on the device of any one of claims 1 to 7, characterized by comprising the following steps:
(1) Setting the volume flow rate of the gas jet, the volume flow rate of the solid particles, the mass flow rate of the gas jet and the mass flow rate of the solid particles in the host according to the required particle concentration, and setting the rotating speed of the screw feeder and the rotating speed of the stirring motor according to the mass flow rate of the solid particles;
(2) Opening the feeding system, the gas supply system and the stirring paddle, and continuously feeding particles into the fluidized reactor through the feeding port by the spiral feeder;
(3) Gas enters from a nozzle at the lower end of the fluidized reactor to form jet flow, and particles are mixed with the jet flow and move upwards under the action of a stirring paddle;
(4) The particles added to the jet flow pass through two groups of microwave generators and microwave receivers at the outlet, the host machine collects microwave signals and judges whether the concentration of the gas-solid mixture meets the requirement or not;
(5) The host machine adjusts the rotation speeds of the spiral feeding motor and the stirring motor and adjusts the opening of the electric valve according to the judgment result in the step (4); if the judgment result is that the concentration exceeds the set concentration, the rotating speeds of the spiral feeding motor and the stirring motor are reduced, and the opening degree of the electric valve is increased; otherwise, the rotating speeds of the spiral feeding motor and the stirring motor are increased, and the opening degree of the electric valve is reduced.
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| CN202010517163.2A CN111595744B (en) | 2020-06-09 | 2020-06-09 | Device and method for adding solid particles into gas-phase jet flow |
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| CN202010517163.2A CN111595744B (en) | 2020-06-09 | 2020-06-09 | Device and method for adding solid particles into gas-phase jet flow |
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| CN112224892A (en) * | 2020-10-14 | 2021-01-15 | 中国石油化工股份有限公司 | Accurate feed arrangement of low concentration solid particle |
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| US6694796B2 (en) * | 2001-01-23 | 2004-02-24 | B3 Systems, Inc. | Device and method for introducing a known dust concentration spike for calibrating particulate matter continuous emission monitoring systems |
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| JP2001031683A (en) * | 1999-07-22 | 2001-02-06 | Mitsui Chemicals Inc | Production of alkoxysilane |
| CN1762569A (en) * | 2005-09-15 | 2006-04-26 | 上海交通大学 | Circular spout bed equipped with circular multi-nozzle ventilation mechanism |
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