CN-121994785-A - Powder generation and transportation visualization device and use method

CN121994785ACN 121994785 ACN121994785 ACN 121994785ACN-121994785-A

Abstract

The invention discloses a visualization device for powder generation and transportation and a use method thereof, which belong to the technical field of gas-solid two-phase flow experiments and comprise a gas and powder generation module, a gas pipeline transportation module and a tail gas treatment and powder collection module which are sequentially communicated, wherein the gas and powder generation module fuses solid particle size powder or powder generated by reaction with transportation gas to form a two-phase flow consisting of gas and solid particles, the two-phase flow is transported in a long distance through the gas pipeline transportation module and visually observes the sedimentation phenomenon of the powder, finally enters the tail gas treatment and powder collection module to collect powder in gas, the recycling of the solid particles is realized, and the pollution to the environment is reduced.

Inventors

CHU TIANSHU
FENG SHEN
FAN XU
CAO LIWEN
LI ZHAOGUO

Assignees

核工业理化工程研究院

Dates

Publication Date: 20260508
Application Date: 20251230

Claims (10)

1. The visualized device for generating and transporting the powder is characterized by comprising a gas and powder generating module, a gas pipeline transporting module and a tail gas treatment and powder collection module which are sequentially communicated, wherein the gas and powder generating module fuses solid particle size powder or powder generated by reaction with transport gas to form a two-phase flow consisting of gas and solid particles, and the two-phase flow is transported for a long distance through the gas pipeline transporting module and visualized to observe the sedimentation phenomenon of the powder; the gas and powder generation module comprises a gas carrying powder conveying unit and a powder generation conveying unit, and the gas carrying powder conveying unit and the powder generation conveying unit are respectively communicated with an inlet of the gas pipeline conveying module.
2. The visualization device of claim 1, wherein the gas-entrained powder transport unit comprises a compressed gas pump, a powder storage tank, a powder delivery device, and a vacuum generator, the powder storage tank in communication with the powder delivery device, an outlet of the powder delivery device in communication with a suction inlet of the vacuum generator, the vacuum generator in communication with the compressed gas pump, and an outlet of the vacuum generator in communication with an inlet of the gas conduit transport module.
3. The visualization device of claim 1, wherein the powder generation transport unit comprises a nitrogen gas high pressure cylinder, a gas source storage tank and a reaction gas path device, wherein the gas source storage tank is communicated with a first gas inlet of the reaction gas path device, the gas source storage tank is communicated with a second gas inlet of the reaction gas path device, the first gas inlet is opposite to the second gas inlet, the nitrogen gas high pressure cylinder is communicated with a third gas inlet of the reaction gas path device, an outlet of the reaction gas path device is communicated with an inlet of the gas pipeline transport module, and the third gas inlet is opposite to an outlet of the reaction gas path device.
4. A visualization device as in claim 3, wherein a mass flow controller is mounted on the one air source storage tank, a pre-heating evaporator is disposed in the two air source storage tanks, and a mass flow controller is mounted on the two air source storage tanks.
5. The visualization device according to claim 1, wherein the gas pipeline transportation module comprises a mounting bracket assembly and a transparent pipeline assembly arranged on the mounting bracket assembly through a quick-release connecting assembly, the transparent pipeline assembly comprises a plurality of visualization straight pipe sections and bent pipelines, the visualization straight pipe sections are sequentially arranged at intervals, the tail ends of the visualization straight pipe sections are sequentially connected through the bent pipelines to form a long-distance visualization transportation pipeline, the inlet of the long-distance visualization transportation pipeline is communicated with the outlet of the vacuum generator or the outlet of the reaction gas circuit device, and the outlet of the long-distance visualization transportation pipeline is communicated with the inlet of the tail gas treatment and powder collection module.
6. The visualization device of claim 5, wherein the mounting bracket assembly comprises two vertically disposed long channels, and short channels fixed to each long channel at intervals by T-bolts, the short channels disposed on the two long channels being disposed on the same horizontal plane in pairs, the short channels disposed on the same horizontal plane being respectively used to fix the ends of the visualization straight tube sections.
7. The visualization device of claim 5, wherein one of the visualization straight pipe sections is replaceable with a typical structural pipe assembly, the typical structural pipe assembly being an orifice structural pipe assembly, a spool structural pipe assembly, or a reducing structural pipe assembly, each of which is installed in the long-distance visualization transport pipe via the quick-release connection assembly for replacing any one of the visualization straight pipe sections.
8. The visualization apparatus of claim 7, wherein the orifice plate structure conduit assembly comprises a transparent straight conduit and an orifice plate radially disposed within the transparent straight conduit, and the valve core structure conduit assembly comprises a transparent straight conduit and a valve core disposed within the transparent straight conduit, and the reducing structure conduit assembly comprises a transparent straight conduit and a reducing pipe disposed within the transparent straight conduit, wherein the reducing pipe gradually reduces the diameter of the transparent straight conduit and maintains the reduced diameter.
9. The visualization device of claim 1, wherein the tail gas treatment and powder collection module comprises a powder recovery assembly, a powder filtration assembly and a gas collection and evacuation assembly, the powder recovery assembly comprises four cyclone filters which are sequentially connected in series, an inlet of the cyclone filter positioned at the first position is communicated with an outlet of the long-distance visualization conveying pipeline, an outlet of the cyclone filter positioned at the last position is communicated with the powder filtration assembly, the powder filtration assembly adopts a polytetrafluoroethylene or borosilicate glass fiber filter element, and the gas collection and evacuation assembly comprises a collection container and a corrosion-resistant dry vacuum pump which are mutually communicated through pipelines, and the collection container is communicated with the powder filtration assembly.
10. The method of using a powder generating and transporting visualization apparatus as defined in any one of claims 1 to 9, comprising the steps of: Step 1, if a gas carrying powder conveying unit is selected, plugging an inlet of a powder generating conveying unit and an inlet of a long-distance visual conveying pipeline through a blind plate, and if the powder generating conveying unit is selected, plugging the gas carrying powder conveying unit and the inlet of the long-distance visual conveying pipeline through the blind plate; Step 2, starting a corrosion-resistant dry vacuum pump, pumping the whole device to a certain negative pressure state, closing the inlet of the long-distance visual conveying pipeline, observing the change of the value of the accessed pressure gauge, and confirming that the air tightness of the system is good; Step 3, if aiming at the generation mode that the gas carries solid powder with different particle diameters, starting a compressed air pump, enabling the compressed air to enter a vacuum generator, generating negative pressure at a suction inlet of the vacuum generator, pouring the solid powder with different particle diameters into a powder storage tank, starting a powder conveying device, quantitatively and stably sucking the powder from the powder storage tank, conveying the powder into the vacuum generator, and under the action of high-speed airflow, enabling the powder to be instantaneously atomized to form uniform gas-solid two-phase flow, and then blowing the uniform gas-solid two-phase flow into a long-distance visual conveying pipeline; Starting a preheating evaporator in a two-way gas source storage tank, starting a nitrogen high-pressure gas cylinder, establishing a stable nitrogen flow field, and then simultaneously starting a one-way gas source storage tank and a two-way gas source storage tank; Step 4, the gas-solid two-phase flow formed in the step 3 stably flows in a long-distance visual conveying pipeline, and the powder particle conveying state and sedimentation conditions of powder particles in the conveyed gas-solid two-phase flow in a visual straight pipe section and a curved pipeline are observed and recorded so as to obtain simulation experiment significance in different scenes; Step 5, performing visual observation and recording on the typical structure pipe fitting, namely stopping experiments correspondingly aiming at different experimental scenes, selecting an orifice plate structure pipe assembly, a valve core structure pipe assembly or a different diameter structure pipe assembly to replace one visual straight pipe section, and repeating the steps 1-3 to perform visual observation and recording on powder particle transportation and sedimentation conditions on the typical structure pipe assembly to obtain simulation experimental results on the typical structure pipe fitting; step 6, the gas-solid two-phase flow finally enters a tail gas treatment and powder collection module, one part of powder is collected by a powder recovery assembly, the other part of powder is collected by a filter element at a powder filtering assembly, the rest of impurity gas is collected in a collection container, finally clean gas is emptied by a corrosion-resistant dry vacuum pump, and after the experiment is finished, the gas and powder generation module and related devices in the tail gas treatment and collection module are sequentially closed to finish the experiment operation; And 7, after the experiment is finished and the whole device is stable, recovering and collecting and capturing the powder by the powder recovery assembly and the powder filtering assembly, weighing or carrying out subsequent analysis, and meanwhile, further observing and sampling and analyzing sediments on the inner walls of the visualized straight pipe section and the bent pipe section in the gas pipeline transportation module.

Description

Powder generation and transportation visualization device and use method Technical Field The invention relates to the technical field of gas-solid two-phase flow experiments, in particular to a powder generation and transportation visualization device and a use method thereof. Background For a process system that completes a particular process flow, the system is typically isolated from the outside, maintained at a certain pressure, and transporting a particular material while avoiding the presence of other impurities within the system. However, during the long-term operation of the process system, air in the atmosphere environment continuously permeates into the system, process gas in the system reacts with water vapor or other organic gases to generate solid powder with micron-sized or smaller size, the powder continuously collides and condenses and grows gradually to increase in size during the process of conveying air flow by the system, when the inertial force of the powder moving along with the air flow is insufficient to counter gravity, the powder is settled under the action of friction force between the powder and pipes and equipment in the system, and the powder continuously settles on the surface of the inner wall along with the extension of time. These powders settle in the system causing equipment to clog, performance to drop and even malfunction. In view of the above, it is necessary to develop a set of devices and methods for simulation experiments to observe the actual transport and sedimentation of the actual powder in the pipes and special components. According to the analysis performed by the existing process systems, the following problems exist: 1. In the practical process system, a closed and opaque metal pipeline and equipment are usually adopted, the real-time process of powder generation, coagulation, growth, sedimentation and flow in the system cannot be directly observed, and problems can be found only when the powder is sedimented to a certain extent, abnormal system pressure, equipment blockage or product yield reduction are caused, and the problems cannot be early-warned and prevented, and only passive response is realized. There is no visual understanding of the mechanism, rate, and key location of powder generation and sedimentation. 2. The existing gas-solid two-phase flow experimental device is often focused on researching the transport characteristics of known powder, but has the defect of simulating the core mechanism of generating powder in situ by gaseous reaction, and most devices directly inject the prefabricated powder by adopting a dry powder generator. The method can not simulate the dynamic process of gas reaction, nucleation and growth, the prefabricated powder has differences from the powder generated by the actual reaction in aspects of morphology, particle size distribution, surface characteristics and the like, the authenticity of the experiment is affected, and meanwhile, an actual process system usually works under vacuum or specific pressure (positive pressure or negative pressure). The pressure environment directly influences the diffusion rate and reaction rate of the gas and the collision and condensation efficiency of powder particles, and the simulation result is distorted by neglecting the pressure factors. 3. A fixed set of experimental equipment is usually only capable of researching a pipe diameter and an arrangement form, and cannot simulate a complex pipeline network in a practical industrial system, such as a pipeline network comprising elbows, reducer pipes, orifice plates, valves and the like, and the key components are just the areas where powder sedimentation and blockage are most likely to occur. In summary, the existing technical means have the problems of difficult observation, simulation distortion, poor flexibility and the like, cannot effectively meet urgent needs of prospective, mechanical and predictive research on powder problems in a process system, and lacks a comprehensive powder generation and transportation simulation experiment device which can highly restore the internal environment of a real system, has visual observation capability and is modularized and expandable. Disclosure of Invention The invention aims at overcoming the technical defects in the prior art and provides a powder generation and transportation visualization device. Another object of the invention is to provide a method of using a visualization device for powder generation and transport. The technical scheme adopted for realizing the purpose of the invention is as follows: The visualized device for powder generation and transportation comprises a gas and powder generation module, a gas pipeline transportation module and a tail gas treatment and powder collection module which are sequentially communicated, wherein the gas and powder generation module fuses solid particle size powder or powder generated by reaction with transportation gas to form a two-phase