Viscous and wet fine coal drying, separating and upgrading system

Abstract

The invention belongs to the technical field of drying, separating and upgrading of coal particles, and particularly relates to a drying, separating and upgrading system for viscous and wet fine coal. Comprising the following steps: vibrating a gas-solid separation fluidized bed, and setting a pulse airflow process of the vibrating gas-solid separation fluidized bed according to physical property parameters of viscous and wet fine coal by taking hot-state magnetite powder as a separation medium; the vibration gas-solid separation fluidized bed is connected with a parameter real-time control system, a pressure sensor monitors density fluctuation of gas-solid suspensions in the vibration gas-solid separation fluidized bed and collision acting force of particles in a bed layer, and the magnetite powder medium bed layer forms a uniform fluidization state under the synergistic effect of pulse airflow and periodic simple harmonic vibration. The drying dehydration and the separation de-ashing of the viscous and wet fine coal in the separation medium are realized, and the quality improvement of the viscous and wet fine coal is realized. The hot magnetite powder is adopted as a separation medium, a suspension fluidization environment suitable for fine coal separation is formed under the action of vibration and pulsating airflow, and drying, separation and quality improvement of the viscous and wet fine coal are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of drying, sorting and upgrading of coal particles, and in particular relates to a system for drying, sorting and upgrading of sticky and wet fine coal particles. Background Art

[0002] With the development and application of coal mining technology and mining methods, the quality of raw coal fluctuates greatly, and the content of high-ash, high-water-content, low-quality coal increases. At present, the reserves of high-water-content, high-ash-content, low-quality coal are huge, accounting for about 40% of coal reserves. It mainly includes lignite, long flame coal, non-sticky coal and weakly sticky coal, which have low metamorphic degree, high moisture content and easy mudification. In the process of coal combustion and utilization, for every 10% increase in moisture or ash content, the calorific value decreases by 500kcal / kg~750kcal / kg, and CO2 emissions increase by 5%~15%. Coal drying and sorting is the source technology of clean coal, which can effectively remove impurities such as moisture and ash in coal, improve coal quality, and promote the transformation of coal resources from traditional fuels to clean fuels and high-quality raw materials.

[0003] Dry coal preparation technology is suitable for the sorting and upgrading of arid and water-scarce areas and coal that is prone to mudification. Existing dry coal preparation technologies mainly include wind sorting, dry heavy medium fluidized bed sorting and photoelectric sorting, which are mainly suitable for pre-selection and gangue removal of coal >6mm, and cannot sort and upgrade fine-grained coal with high moisture content. Due to the high external water content of sticky fine-grained coal, particles are easy to adhere to each other and cannot be loosely fluidized under the action of airflow. In addition, the lower limit of effective sorting particle size for traditional dry sorting and deashing is high, and the mismatch of clean coal causes calorific value loss; limited by the excessive moisture content and small particle size of raw coal, the adhesion of coal particles leads to deterioration of sorting effect, which restricts the increase of product calorific value. In the process of coal drying and upgrading, as the temperature of coal rises and the surface moisture vaporizes, the heat loss is large, resulting in low efficiency of coal drying heat utilization, poor thermal stability, and great safety hazards. It is easy to cause spontaneous combustion of coal during the drying process, and the drying and upgrading effect is limited, and the energy consumption is high and reabsorption is easy to occur. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a system for drying, sorting and upgrading of sticky and wet fine-grained coal. Hot magnetite powder is used as a sorting medium, and a suspended fluidized environment suitable for fine-grained coal sorting is formed under the action of vibration and pulsating airflow. While forming a sorting suspension environment, the hot magnetite powder can be used as a heat medium to make the sticky and wet fine-grained coal entering the bed layer evenly heated, quickly remove surface moisture, and avoid the occurrence of self-ignition of sticky and wet particles under pressure. In the process of deashing and upgrading the sticky and wet particles, periodic pulse airflow and simple harmonic vibration are used as driving forces to strengthen the movement of bed particles and density segregation. Among them, the pulse airflow can improve the interaction between gas and particles and increase the bed expansion rate. The vibration effect can organize particle oscillation and strengthen the collision behavior between particles, which is conducive to removing magnetite powder particles adhering to the surface of fine-grained coal. In addition, the fine-grained coal can achieve effective separation of clean coal and gangue according to density under the synergistic effect of vibration and airflow.

[0005] The present invention solves the above technical problems through the following technical solutions.

[0006] The object of the present invention is to provide a system for drying, sorting and upgrading sticky and wet fine coal, comprising:

[0007] A vibrating gas-solid separation fluidized bed is used, wherein the vibrating gas-solid separation fluidized bed uses hot magnetite powder as the separation medium, and sets the process parameters of the pulse airflow and periodic simple harmonic oscillation of the vibrating gas-solid separation fluidized bed and the drying temperature of the hot magnetite powder according to the humidity and particle size distribution of the sticky fine coal and the deagglomeration force of the adhered particles of different particle sizes.

[0008] The vibrating gas-solid separation fluidized bed is connected to a parameter real-time control system, and a plurality of pressure sensor groups are equidistantly installed along the axial position of the bed of the vibrating gas-solid separation fluidized bed, and the control system and all the pressure sensor groups are connected by signal; the density fluctuation of the gas-solid suspension in the vibrating gas-solid separation fluidized bed is monitored by the pressure sensor group, and the signal is transmitted to the control system, and the control system monitors and regulates the density fluctuation and the fluidization state of the bed of the vibrating gas-solid separation fluidized bed in real time; and the collision force of particles in the bed layer of the solid separation fluidized bed under different operating parameters is captured by the pressure sensor group, and then the database of external force required for the crushing of agglomerated particles in the control system is benchmarked, and the operating parameters of the vibrating gas-solid separation fluidized bed are adjusted by feedback to achieve the crushing state of agglomerated particles in the vibrating gas-solid separation fluidized bed.

[0009] The sticky and wet fine coal is dried and upgraded in the hot fluidized magnetite powder medium. The separation medium bed forms a uniform fluidized state under the synergistic effect of pulse airflow and periodic simple harmonic oscillation, thereby achieving the separation and upgrading of the sticky and wet fine coal.

[0010] Furthermore, the process parameters of the periodic simple harmonic oscillation include vibration frequency and amplitude parameters, and the process parameters of the pulsed airflow include pulse frequency and constant airflow velocity.

[0011] Furthermore, the pulse frequency of the pulse airflow is 10 Hz to 30 Hz, and the air velocity of the constant airflow is 0 cm / s < 100 cm / s.

[0012] Furthermore, the vibration amplitude of the vibrating gas-solid separation fluidized bed is 1 mm to 3 mm, and the vibration frequency is 10 Hz to 50 Hz.

[0013] Furthermore, the drying temperature of the hot magnetite powder is 0°C<80°C.

[0014] Furthermore, the particle size of the magnetite powder is 0.3 mm to 0.074 mm, and the true density is 4.65 g / cm 3 .

[0015] Furthermore, the particle size of the sticky fine coal is 1 mm to 6 mm, and the external water content is less than 10%.

[0016] Furthermore, each of the pressure sensor groups includes a micro-differential pressure sensor and a quartz force pressure sensor. The micro-differential pressure sensor is used to monitor the fluidization state and density fluctuation of the bed at different axial positions of the vibrating gas-solid separation fluidized bed. The quartz force pressure sensor is used to monitor the collision force of particles in the bed under different operating parameters of the vibrating gas-solid separation fluidized bed.

[0017] Furthermore, the control system includes a PLC controller, a data acquisition instrument and a computer data analysis system, wherein the signals of the micro-differential pressure sensor and the quartz force pressure sensor are connected to the data acquisition instrument, the signals of the data acquisition instrument are connected to the computer data analysis system, and the signals of the PLC controller are connected to the computer data analysis system and the vibrating gas-solid separation fluidized bed.

[0018] Furthermore, after the sticky and wet fine-grained coal is sorted and upgraded, the upper layer of the vibrating gas-solid separation fluidized bed is clean coal, the middle layer is medium coal, and the lower layer is gangue.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The sticky and wet fine-grained coal drying, sorting and upgrading system provided by the present invention adopts hot magnetite powder as a sorting medium. Under the action of the vibration and pulsating airflow of the vibrating gas-solid sorting fluidized bed, a suspended fluidized environment suitable for fine-grained coal sorting is formed. While forming the sorting suspension environment, the hot magnetite powder can be used as a heat medium to make the sticky and wet fine-grained coal entering the bed layer heated evenly, quickly remove surface moisture, and avoid the occurrence of the sticky and wet particles being pressed and spontaneously combusted. In the process of drying, sorting and upgrading the sticky and wet particles, periodic pulse airflow and simple harmonic vibration are both used as driving forces to strengthen the movement of bed particles and density segregation. Among them, the pulse airflow can improve the interaction between gas and particles and increase the bed expansion rate. The vibration can organize particle oscillation and strengthen the collision behavior between particles, which is conducive to removing the magnetite powder particles adhering to the surface of the fine-grained coal. In addition, the fine-grained coal can achieve effective separation of clean coal and gangue according to density under the synergistic action of vibration and airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a flow chart of the system for drying, sorting and upgrading sticky and wet fine coal according to the present invention.

[0022] Figure 2 This is a schematic diagram of the drying, sorting and upgrading of sticky and wet fine coal according to the present invention.

[0023] Illustration Description:

[0024] 1. Vibrating gas-solid separation fluidized bed, 2. Pressure sensor, 3. Control system. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that the professional terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. Unless otherwise specifically stated, the various raw materials, reagents, instruments and equipment used in the following embodiments of the present invention can be purchased from the market or prepared by existing methods.

[0027] Existing dry coal preparation technologies mainly include wind sorting, dry heavy medium fluidized bed sorting and photoelectric sorting, which are mainly suitable for pre-selection and discharge of coal with a diameter of >6 mm, and cannot be used to sort and improve the quality of fine-grained coal with high moisture content. Due to the high external water content of sticky fine-grained coal, particles are easy to adhere to each other and cannot be loosely fluidized under the action of airflow. In addition, the lower limit of effective sorting particle size for traditional dry sorting and deashing is high, and the mismatch of clean coal causes calorific value loss. Due to the high moisture content and small particle size of raw coal, the adhesion of coal particles leads to deterioration of sorting effect, which restricts the increase of product calorific value. In the process of drying and improving coal using dry coal preparation technology, as the temperature of coal rises and the surface moisture vaporizes, the heat loss is large, resulting in low heat utilization efficiency of coal drying, poor thermal stability, and great safety hazards. It is easy to cause spontaneous combustion of coal during the drying process, and the drying and quality improvement effect is limited. In addition, the energy consumption is high and reabsorption is prone to occur.

[0028] Based on the above problems, the present invention provides a system for drying, sorting and upgrading sticky and wet fine coal. Figure 1 As shown, including:

[0029] A vibrating gas-solid separation fluidized bed 1, wherein the vibrating gas-solid separation fluidized bed 1 uses hot magnetite powder as a separation medium, is added into the vibrating gas-solid separation fluidized bed 1, and according to the humidity of the sticky fine coal, the particle size distribution state, and the deagglomeration force of the adhered particles of different particle sizes, the process parameters of the pulse airflow and periodic simple harmonic oscillation of the vibrating gas-solid separation fluidized bed 1 and the drying temperature of the hot magnetite powder are set.

[0030] The vibrating gas-solid separation fluidized bed 1 is connected to a parameter real-time control system 3, and a plurality of pressure sensor groups 2 are equidistantly installed along the axial position of the bed of the vibrating gas-solid separation fluidized bed 1, and the control system 3 is signal-connected to all the pressure sensor groups 2; the density fluctuation of the gas-solid suspension in the vibrating gas-solid separation fluidized bed 1 is monitored by the pressure sensor group 2, and the signal is transmitted to the control system 3, and the control system 3 monitors and regulates the density fluctuation of the vibrating gas-solid separation fluidized bed 1 and the fluidization state of the bed layer of the vibrating gas-solid separation fluidized bed 1 in real time; and the collision force of particles in the bed layer of the solid separation fluidized bed 1 under different operating parameters is captured by the pressure sensor group 2, and then the database of external force required for the crushing of agglomerated particles in the benchmark control system 3 is used to feedback and adjust the operating parameters of the vibrating gas-solid separation fluidized bed 1 to achieve the crushing state of agglomerated particles in the bed layer.

[0031] The sticky and wet fine coal is dried, sorted and upgraded in the hot fluidized magnetite powder medium. The sorting medium bed forms a uniform fluidized state under the synergistic effect of pulse airflow and periodic simple harmonic oscillation, thereby achieving the sorting and upgrading of the sticky and wet fine coal.

[0032] The present invention adopts hot magnetite powder as a sorting medium, and forms a suspended fluidized environment suitable for fine coal sorting under the action of vibration and pulsating airflow. While forming a sorting suspension environment, the hot magnetite powder can be used as a heat medium to make the sticky and wet fine coal entering the bed layer heated evenly, quickly remove surface moisture, and avoid the occurrence of self-ignition of sticky and wet particles under pressure. In the process of drying, sorting and upgrading of sticky and wet particles, periodic pulse airflow and simple harmonic vibration are used as driving forces to strengthen the movement of bed particles and density segregation. Among them, the pulse airflow can improve the interaction between gas and particles and increase the bed expansion rate. The vibration effect can organize particle oscillation and strengthen the collision behavior between particles, which is conducive to removing magnetite powder particles adhering to the surface of fine coal. In addition, the fine coal can achieve effective separation of clean coal and gangue according to density under the synergistic effect of vibration and airflow.

[0033] The invention is further described below through specific examples.

[0034] Example

[0035] A system for drying, sorting and upgrading sticky and wet fine coal, comprising:

[0036] A vibrating gas-solid separation fluidized bed 1, wherein the vibrating gas-solid separation fluidized bed 1 uses hot magnetite powder as a separation medium, is added into the vibrating gas-solid separation fluidized bed 1, and according to the humidity of the sticky fine coal, the particle size distribution state, and the deagglomeration force of the adhered particles of different particle sizes, the process parameters of the pulse airflow and periodic simple harmonic oscillation of the vibrating gas-solid separation fluidized bed 1 and the drying temperature of the hot magnetite powder are set.

[0037] The vibrating gas-solid separation fluidized bed 1 is connected to a parameter real-time control system 3, and a plurality of pressure sensor groups 2 are equidistantly installed along the axial position of the bed of the vibrating gas-solid separation fluidized bed 1, and the control system 3 is signal-connected to all the pressure sensor groups 2; the density fluctuation of the gas-solid suspension in the vibrating gas-solid separation fluidized bed 1 is monitored by the pressure sensor group 2, and the signal is transmitted to the control system 3, and the control system 3 monitors and regulates the density fluctuation of the vibrating gas-solid separation fluidized bed 1 and the fluidization state of the bed layer of the vibrating gas-solid separation fluidized bed 1 in real time; and the collision force of particles in the bed layer of the solid separation fluidized bed 1 under different operating parameters is captured by the pressure sensor group 2, and then the database of external force required for the crushing of agglomerated particles in the benchmark control system 3 is used to feedback and adjust the operating parameters of the vibrating gas-solid separation fluidized bed 1 to achieve the crushing state of agglomerated particles in the bed layer.

[0038] In a specific embodiment, the process parameters of the periodic simple harmonic oscillation include vibration frequency and amplitude parameters, and the process parameters of the pulse airflow include pulse frequency and constant airflow velocity. The pulse frequency of the pulse airflow is 10Hz to 30Hz, 0cm / s<constant airflow velocity is ≤100cm / s. The amplitude of the vibrating gas-solid separation fluidized bed is 1mm to 3mm, and the vibration frequency is 10Hz to 50Hz. By setting the pulse frequency, gas velocity, vibration frequency, amplitude parameters of the pulse airflow of the vibrating gas-solid separation fluidized bed 1 and the drying temperature of the hot magnetite powder, the hot magnetite powder can be used as a heat medium to heat the sticky and wet fine coal entering the bed evenly while forming a separation suspension environment, quickly remove surface moisture, and avoid the occurrence of self-ignition of sticky and wet particles under pressure. In the process of deashing and upgrading of sticky particles, periodic pulse airflow and simple harmonic vibration both serve as driving forces to enhance the movement of bed particles and density segregation. Among them, the pulse airflow can improve the interaction between gas and particles and increase the bed expansion rate. The vibration effect can organize particle oscillation and enhance the collision behavior between particles, which is beneficial to remove magnetite powder particles adhering to the surface of fine coal.

[0039] In a specific embodiment, 0°C < the temperature of the hot magnetite powder ≤ 80°C. The particle size of the magnetite powder is 0.3 mm to 0.074 mm, and the true density is 4.65 g / cm 3 Hot magnetite powder is used as the separation medium, in which the hot magnetite powder is quickly and evenly dehydrated and dried, and oxygen is isolated, thus avoiding the occurrence of spontaneous combustion of wet particles under pressure.

[0040] In a specific embodiment, each of the pressure sensor groups 2 includes a micro-differential pressure sensor and a quartz force pressure sensor. The micro-differential pressure sensor is used to monitor the fluidization state and density fluctuation of the bed at different axial positions of the vibrating gas-solid separation fluidized bed. The quartz force pressure sensor is used to monitor the collision force of particles in the bed under different operating parameters of the vibrating gas-solid separation fluidized bed.

[0041] In a specific embodiment, the control system 3 includes a PLC controller, a data acquisition instrument and a computer data analysis system, wherein the micro-differential pressure sensor and the quartz force pressure sensor are both connected to the data acquisition instrument, the data acquisition instrument signal is connected to the computer data analysis system, and the PLC controller signal is connected to the computer data analysis system and the vibrating gas-solid separation fluidized bed.

[0042] The method for sorting and upgrading the wet fine coal by using the above-mentioned sticky fine coal drying, sorting and upgrading system comprises the following steps:

[0043] S1. Hot magnetite powder is used as the separation medium. The hot magnetite powder is quickly and evenly dehydrated and dried, and oxygen is isolated to avoid spontaneous combustion caused by accumulation of fine coal particles. The magnetite powder uses the common specifications of coal preparation plants, and the true density is 4.65g / cm 3 The particle size range is 0.3mm~0.074mm, among which the mass fraction of 0.3±0.15mm particle size is 80%, 0.15±0.074mm particle size accounts for 16% of the total mass of magnetite powder, and 0.074mm particle size accounts for 4%.

[0044] S2. Select materials, the particle size range of the sticky and wet fine coal is 1mm to 6mm, and the external water content is less than 10%; add the hot magnetite powder into the vibrating gas-solid separation fluidized bed 1, and then set the pulse frequency, gas velocity, vibration frequency, amplitude parameters of the pulse airflow of the vibrating gas-solid separation fluidized bed 1 and the drying temperature of the hot magnetite powder according to the humidity, particle size distribution state of the sticky and wet fine coal, and the deagglomeration force of the adhered particles of different particle sizes; wherein the pulse frequency of the pulse airflow can be any value between 10Hz and 30Hz, and the constant airflow velocity can be any value between 0cm / s<constant airflow velocity≤100cm / s; the amplitude of the vibrating gas-solid separation fluidized bed 1 can be any value between 1mm and 3mm, and the vibration frequency can be any value between 10Hz and 50Hz; the drying temperature of the hot magnetite powder can be any value between 0℃<the drying temperature of the hot magnetite powder≤80℃. It should be noted that, by vibrating the gas-solid separation fluidized bed 1 , eccentric blocks are arranged at the front and rear of the bottom of the bed body to achieve periodic bed surface vibration.

[0045] S3. The vibrating gas-solid separation fluidized bed 1 is connected to a parameter real-time control system 3. A plurality of pressure sensor groups 2 are equidistantly installed along the axial position of the bed of the vibrating gas-solid separation fluidized bed. The control system 3 is signal-connected to all the pressure sensor groups 2. In a specific embodiment, the pressure sensor group 2 includes a micro-differential pressure sensor and a quartz force pressure sensor. The quartz force pressure sensor is a PCB-type quartz force pressure sensor. The number of the pressure sensor groups 2 is 4. The micro-differential pressure sensor and the PCB-type quartz force sensor are alternately arranged. The axial distance between the micro-differential pressure sensor and the PCB-type quartz force sensor is 1 cm. The micro-differential pressure sensor is used to monitor the fluidization state and density fluctuation of the bed layer at different axial positions of the vibrating gas-solid separation fluidized bed 1. The quartz force sensor is used to monitor the collision force of particles in the bed layer under different operating parameters of the vibrating gas-solid separation fluidized bed 1.

[0046] S4, the control system 3 includes a PLC controller, a data acquisition instrument and a computer data analysis system, wherein the signals of the micro differential pressure sensor and the quartz force sensor are connected to the data acquisition instrument, the signals of the data acquisition instrument are connected to the computer data analysis system, and the signals of the PLC controller are connected to the computer data analysis system and the vibrating gas-solid separation fluidized bed 1; the density fluctuation of the gas-solid suspension in the vibrating gas-solid separation fluidized bed 1 is monitored by the micro differential pressure sensor, the data acquisition instrument inputs the signals of the micro differential pressure sensor and the quartz force sensor into the computer data analysis system after converting the electrical signal into the digital signal, and the PLC controller monitors and regulates the density fluctuation and the fluidization state of the bed of the vibrating gas-solid separation fluidized bed 1 in real time; and the collision force of the particles in the bed under different operating parameters is captured by the quartz force sensor, and the signal is fed back to the data acquisition instrument, and is input into the computer data analysis system after converting the electrical signal into the digital signal, and then the database of the external force required for the crushing of the agglomerated particles in the PLC controller is used to feedback and adjust the operating parameters of the vibrating gas-solid fluidized bed to achieve the crushing state of the agglomerated particles in the bed.

[0047] S5. Pulse airflow and vibration energy are introduced into the bed layer of the vibrating gas-solid separation fluidized bed 1 through airflow pulses and electromagnetic vibration. The airflow velocity is controlled by the airflow pipeline valve, and the airflow value can be directly read by the flow meter. The introduction of pulse airflow can form a synergistic effect with the vibration effect, strengthen the sorting of moist coal particles according to density, accelerate the dehydration of moist particles to form agglomerated particles, and periodic simple harmonic vibration can promote particle loosening, break the strong chain effect formed by particle accumulation, effectively organize the airflow to pass through the bed particles evenly, and promote uniform fluidization of particles, such as Figure 2 shown.

[0048] S6. Under the combined excitation of airflow and vibration, the bed layer of the vibrating gas-solid separation fluidized bed 1 forms a fluidized suspension with uniform and stable density. The hot magnetite powder medium bed layer forms a uniform fluidized state under the synergistic effect of pulse airflow and periodic simple harmonic oscillation, achieving a stable environment that satisfies the separation of clean coal and gangue by density. At this time, the sticky and wet fine coal is added to the bed layer from the upper part of the bed layer. The coal entering the bed layer is continuously fluidized and evenly heated in the hot magnetite powder. The sticky and wet fine coal is quickly dehydrated and dried in the hot fluidized magnetite powder medium, and is separated in layers according to the bed density. Gangue with a density greater than the sorting density sinks, while low-density clean coal with a density less than the sorting density floats. The sorting time of the airflow sorting bed is set to 30s according to the industrial fluidized sorting time. Finally, under the comprehensive effects of vibration separation, airflow drag, buoyancy effect, etc., the sticky and wet fine coal is dried, dehydrated, sorted and deashed in the sorting medium according to density separation, thereby improving the quality and efficiency of the sticky and wet fine coal. After the sorting and quality improvement of the sticky and wet fine coal is completed, the upper layer in the vibrating gas-solid sorting fluidized bed 1 is clean coal, the middle layer is medium coal, and the lower layer is gangue, thereby reaching the sorting process regulation and external water removal and drying of the sticky and wet fine coal.

[0049] In summary, the present invention uses hot magnetite powder as a sorting medium, and under the action of vibration and pulsating airflow, a suspended fluidized environment suitable for fine coal sorting is formed. While forming a sorting suspension environment, the hot magnetite powder can be used as a heat medium to make the sticky and wet fine coal entering the bed layer heated evenly, quickly remove surface moisture, and avoid the occurrence of self-ignition of sticky and wet particles under pressure. In the process of drying, sorting and upgrading of sticky and wet particles, periodic pulse airflow and simple harmonic vibration are used as driving forces to strengthen the movement of bed particles and density segregation. Among them, the pulse airflow can improve the interaction between gas and particles and increase the bed expansion rate. The vibration effect can organize particle oscillation and strengthen the collision behavior between particles, which is conducive to removing magnetite powder particles adhering to the surface of fine coal. In addition, the fine coal is effectively separated from clean coal and gangue according to density under the synergistic effect of vibration and airflow.

[0050] It should be noted that when the present invention involves a numerical range, it should be understood that the two endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as those in the embodiments, in order to avoid redundancy, the present invention describes a preferred embodiment. Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the attached claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0051] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A system for drying, sorting and upgrading wet fine coal, characterized in that: include: A vibrating gas-solid separation fluidized bed (1), wherein the vibrating gas-solid separation fluidized bed (1) uses hot magnetite powder as a separation medium, and sets the process parameters of the pulsed airflow and periodic simple harmonic oscillation of the vibrating gas-solid separation fluidized bed (1) and the temperature of the hot magnetite powder according to the humidity and particle size distribution of the sticky fine coal and the deagglomeration force of particles of different particle sizes; The vibrating gas-solid separation fluidized bed (1) is connected to a control system (3), and a plurality of pressure sensor groups (2) are equidistantly installed along the axial position of the bed body of the vibrating gas-solid separation fluidized bed (1), and the control system (3) is signal-connected to all the pressure sensor groups (2); the density fluctuation of the gas-solid suspension in the vibrating gas-solid separation fluidized bed (1) is monitored by the pressure sensor group (2), and the signal is transmitted to the control system (3), and the control system (3) monitors and controls the density fluctuation and bed fluidization state of the vibrating gas-solid separation fluidized bed (1) in real time; and the collision force of particles in the bed layer of the solid separation fluidized bed (1) under different operating parameters is captured by the pressure sensor group (2), and then the database of external force required for crushing agglomerated particles in the control system (3) is benchmarked, and the operating parameters of the vibrating gas-solid separation fluidized bed (1) are feedback-adjusted to achieve the crushing state of agglomerated particles in the vibrating gas-solid separation fluidized bed (1); The sticky and wet fine coal is dehydrated and dried in the sorting medium, and the sorting medium forms a uniform fluidized state under the synergistic effect of pulse airflow and periodic simple harmonic oscillation, thereby achieving the sorting and quality improvement of the sticky and wet fine coal.

2. The system for drying, sorting and upgrading sticky and wet fine coal according to claim 1 is characterized in that: The process parameters of the periodic simple harmonic oscillation include vibration frequency and amplitude parameters, and the process parameters of the pulsed airflow include pulse frequency and constant airflow velocity.

3. The system for drying, sorting and upgrading sticky and wet fine coal according to claim 2 is characterized in that: The pulse frequency of the pulse airflow is 10 Hz to 30 Hz, and the air velocity of the constant airflow is 0 cm / s or less than 100 cm / s.

4. The system for drying, sorting and upgrading sticky and wet fine coal according to claim 2 is characterized in that: The vibration amplitude of the vibrating gas-solid separation fluidized bed is 1 mm to 3 mm, and the vibration frequency is 10 Hz to 50 Hz.

5. The system for drying, sorting and upgrading sticky and wet fine coal according to claim 1 is characterized in that: 0°C<the temperature of the hot magnetite powder≤80°C.

6. The system for drying, sorting and upgrading sticky and wet fine coal according to claim 1 is characterized in that: The particle size of the magnetite powder is 0.3 mm to 0.074 mm, and the true density is 4.65 g / cm 3 .

7. The system for drying, sorting and upgrading sticky and wet fine coal according to claim 1 is characterized in that: The viscous fine coal has a particle size of 1 mm to 6 mm and an external water content of less than 10%.

8. The system for drying, sorting and upgrading sticky and wet fine coal according to claim 1 is characterized in that: Each of the pressure sensor groups (2) comprises a micro differential pressure sensor and a quartz force pressure sensor. The micro differential pressure sensor is used to monitor the fluidization state and density fluctuation of the bed layer at different axial positions of the vibrating gas-solid separation fluidized bed. The quartz force pressure sensor is used to monitor the collision force of particles in the bed layer under different operating parameters of the vibrating gas-solid separation fluidized bed.

9. The system for drying, sorting and upgrading sticky and wet fine coal according to claim 8, characterized in that: The control system (3) comprises a PLC controller, a data acquisition instrument and a computer data analysis system, wherein the signals of the micro differential pressure sensor and the quartz force pressure sensor are both connected to the data acquisition instrument, the signals of the data acquisition instrument are connected to the computer data analysis system, and the signals of the PLC controller are connected to the computer data analysis system and the vibrating gas-solid separation fluidized bed.

10. The system for drying, sorting and upgrading sticky and wet fine coal according to claim 1, characterized in that: After the sticky and wet fine coal is separated and upgraded, the upper layer of the vibrating gas-solid separation fluidized bed is clean coal, the middle layer is medium coal, and the lower layer is gangue.

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