XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 589
bubbles induces the coal particles, causing imbalanced col-
lision forces on them. For instance, particle A, located near
the bubble, experiences a contact force of 0.421 in the grav-
ity direction from a medium particle (dimensionless with
gravity), indicating that the non-equilibrium collision force
of medium particles leads to the entrainment of particles by
bubble wake vortices.
Regulation of Mesoscale Structure by External Energy
In order to address the challenge of maintaining stability in
gas-solid fluidization separation, an extensive investigation
was conducted on the utilization of external energy. The
primary objective was to inhibit the growth of gas bubbles,
enhance the quality of particle fluidization, and achieve
improved coal separation processes. Two main types of
external energy were examined: vibration energy and pulsa-
tion energy. The impact of these external energy sources on
the formation and dispersion of mesoscale structures was
analyzed, leading to a better understanding of the mecha-
nism behind the enhancement of coal separation through
the application of external energy.
For the vibrating heavy medium separation fluidized
bed, uniform dispersion of bubbles is the basis for achiev-
ing effective separation, and the dispersed fluidized bed is
the most ideal separation bed. As shown in Figure 7, the
research results of Zhou Enhui and Zhang Yadong et al. [4,
11–13] found that with the increase of appropriate vibration
frequency, the vibration energy introduced into the bed
gradually increases per unit time, promoting the loosening
of particle groups and allowing excess gas to pass through
the bed more uniformly in the form of microbubbles. The
average size range of bubbles is reduced to between 1.12
and 2.45 cm, achieving the merger of bubbles in the bed
and weakening the influence of bubbles, Improved the uni-
form and stable distribution of bed density.
Dong Liang et al. [14–19] further studied the movement
behavior of bubbles under external pulsating energy excita-
tion. The study found that the introduction of pulsating
airflow can effectively reduce the size of bubbles, and pro-
posed a multi degree of freedom vibration system for bub-
ble particle interaction, as shown in Figure 8. The fluidized
bed layer is layered, and each layer is treated as a rigid body.
The elastic effect of bubbles is exerted on each layer. The
smaller the thickness of each layer is discretized, the more
layers there are, and the better it is to invert the surging of
the bed layer, A practical response model of a multi degree
of freedom linear vibration system in a pulsating fluidized
bed was established, revealing the mechanism of enhanc-
ing the fluidization quality of particles through pulsating
airflow enhancement.
CONCLUSIONS
Gas-solid fluidized-bed dry beneficiation technology pro-
vides a feasible approach for the clean utilization of coal
in arid and water-deficient areas. Understanding the for-
mation and evolution of mesoscale structures is the basis
for enhancing the fluidized-bed beneficiation process. This
study investigates the separation process of coal from the
mesoscale perspective. Testing techniques and identifica-
tion algorithms for bubble recognition have been devel-
oped successively. By combining numerical simulation
and experimental research, the evolving patterns of bubble
structures have been obtained, and a numerical model for
predicting bubble motion behavior has been established,
thus explaining the evolution process of mesoscale struc-
tures. In terms of regulating mesoscale structures, research
has been conducted on the introduction of external energy,
investigating the effects of vibration and pulsation energy
on the coalescence and fracture of mesoscale structures.
These advancements contribute to the development of
Figure 7. Bubble size distribution in vibrating fluidized beds[4]
bubbles induces the coal particles, causing imbalanced col-
lision forces on them. For instance, particle A, located near
the bubble, experiences a contact force of 0.421 in the grav-
ity direction from a medium particle (dimensionless with
gravity), indicating that the non-equilibrium collision force
of medium particles leads to the entrainment of particles by
bubble wake vortices.
Regulation of Mesoscale Structure by External Energy
In order to address the challenge of maintaining stability in
gas-solid fluidization separation, an extensive investigation
was conducted on the utilization of external energy. The
primary objective was to inhibit the growth of gas bubbles,
enhance the quality of particle fluidization, and achieve
improved coal separation processes. Two main types of
external energy were examined: vibration energy and pulsa-
tion energy. The impact of these external energy sources on
the formation and dispersion of mesoscale structures was
analyzed, leading to a better understanding of the mecha-
nism behind the enhancement of coal separation through
the application of external energy.
For the vibrating heavy medium separation fluidized
bed, uniform dispersion of bubbles is the basis for achiev-
ing effective separation, and the dispersed fluidized bed is
the most ideal separation bed. As shown in Figure 7, the
research results of Zhou Enhui and Zhang Yadong et al. [4,
11–13] found that with the increase of appropriate vibration
frequency, the vibration energy introduced into the bed
gradually increases per unit time, promoting the loosening
of particle groups and allowing excess gas to pass through
the bed more uniformly in the form of microbubbles. The
average size range of bubbles is reduced to between 1.12
and 2.45 cm, achieving the merger of bubbles in the bed
and weakening the influence of bubbles, Improved the uni-
form and stable distribution of bed density.
Dong Liang et al. [14–19] further studied the movement
behavior of bubbles under external pulsating energy excita-
tion. The study found that the introduction of pulsating
airflow can effectively reduce the size of bubbles, and pro-
posed a multi degree of freedom vibration system for bub-
ble particle interaction, as shown in Figure 8. The fluidized
bed layer is layered, and each layer is treated as a rigid body.
The elastic effect of bubbles is exerted on each layer. The
smaller the thickness of each layer is discretized, the more
layers there are, and the better it is to invert the surging of
the bed layer, A practical response model of a multi degree
of freedom linear vibration system in a pulsating fluidized
bed was established, revealing the mechanism of enhanc-
ing the fluidization quality of particles through pulsating
airflow enhancement.
CONCLUSIONS
Gas-solid fluidized-bed dry beneficiation technology pro-
vides a feasible approach for the clean utilization of coal
in arid and water-deficient areas. Understanding the for-
mation and evolution of mesoscale structures is the basis
for enhancing the fluidized-bed beneficiation process. This
study investigates the separation process of coal from the
mesoscale perspective. Testing techniques and identifica-
tion algorithms for bubble recognition have been devel-
oped successively. By combining numerical simulation
and experimental research, the evolving patterns of bubble
structures have been obtained, and a numerical model for
predicting bubble motion behavior has been established,
thus explaining the evolution process of mesoscale struc-
tures. In terms of regulating mesoscale structures, research
has been conducted on the introduction of external energy,
investigating the effects of vibration and pulsation energy
on the coalescence and fracture of mesoscale structures.
These advancements contribute to the development of
Figure 7. Bubble size distribution in vibrating fluidized beds[4]