Drying and separation integrated machine for vibrating fluidized bed

Abstract

Drying and separation vibrating fluidized bed for processing wet coal by high-temperature hot air. Wet coal is fed into a vibrating separation chamber connected to a hot air supply duct. The wet coal is vibrated as it is dried and is layered as heat and mass transfer occur between the high-temperature air and the wet coal particles. Hot air enters the bottom of separation chamber through a distribution plate that includes asbestos fiber cloth sandwiched between clamping plates. The wet coal is fed through a feeding distribution device that separates the coal pieces as they enter the separation chamber. After the coal is dried and layered, the heavy and light material exits the separation chamber through two discharge impellers.

Claims

1. A drying and separation integrated machine for a vibrating fluidized bed, comprising a front rack, a rear rack, a separation bed, and an impeller feeder disposed on an upper part at a front end of the separation bed for receiving high-moisture, large-block material, a waste-rock impeller discharger and a fine-coal impeller discharger disposed at a tail end of the separation bed for discharging dried material, two dust-removing and air-inducing hoods disposed on an upper part of the separation bed, each having an exterior heat-insulating coating, two air distribution chambers disposed on a bottom of the separation bed, each having an exterior heat-insulating coating; an air distribution plate disposed on an upper part of the two air distribution chambers, the air distribution plate comprising an asbestos-fiber filter between upper and lower porous metal clamping plates; wherein the front rack and rear rack are connected to the separation bed via a spring and a spring support, the rear rack further comprising a hydraulic cylinder on the bottom of the rear rack so that an inclination angle of the separation bed is adjustable within a range of 10 to +10; a feeding distribution device disposed between the impeller feeder and the separation bed, wherein the feeding distribution device comprises a chute with three rows of bars being arranged at intervals in a crisscross pattern in the chute, positioned to break-up material as it passes over the bars towards the separation bed; an eccentric shaft vibration exciter disposed on the lower part at the front end of the separation bed; an air separator comprising a flow deflection plate and a flow restriction plate disposed on each of the two air distribution chambers, each air separator being operably connected to a hot air duct, for providing high-temperature air to the separation bed through the two air distribution chambers, the hot air duct having a heat insulating coating and further comprising a flow meter and a control valve to control the high-temperature air flow into the two air distribution chambers.

2. The drying and separation integrated machine according to claim 1, further comprising a baffle plate disposed on the front part of the fine-coal impeller discharger.

3. The drying and separation integrated machine according to claim 1, wherein, a frequency conversion and constant pressure controller is disposed at the inlet of the hot air duct to control an error of air inflow volume into the air distribution chamber within a range of 4%.

4. The drying and separation integrated machine, according to claim 1, wherein the heat-insulating coating is 2-3 mm in thickness.

5. The drying and separation integrated machine, according to claim 1, wherein the bars are steel.

Description

DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a front view of the structure in the present invention;

(2) FIG. 2 is a right view of the structure in the present invention;

(3) FIG. 3 is a schematic structural diagram of the input material separator;

(4) FIG. 4 is a top view of the structure shown in FIG. 3.

(5) Among the figures: 1impeller feeder, 2feeding distribution device, 3air distribution chamber, 4dust-removing and air-inducing hood, 5air separator, 6separation bed, 7baffle plate, 8fine-coal impeller discharger, 9eccentric shaft vibration exciter, 10front rack, 11flow meter, 12rear rack, 13hydraulic cylinder, 14waste-rock impeller discharger, 15air distribution plate, 16spring support, 17spring, 18control valve, 19hot air duct, 20chute, 21steel bar.

EMBODIMENTS

(6) Hereunder an embodiment of the present invention will be further described in detail with reference to the accompanying drawings:

(7) As shown in FIGS. 1, 2, and 3, the drying and separation integrated machine for vibrating fluidized bed provided in the present invention mainly comprises a separation bed 6, a front rack 10, a rear rack 12, an air distribution chamber 3, an eccentric shaft vibration exciter 9, a waste-rock impeller discharger 14 and a fine-coal impeller discharger 8. A impeller feeder 1 is disposed on the upper part at the front end of the separation bed 6, a waste-rock impeller discharger 14 and a fine-coal impeller discharger 8 are disposed at the tail end of the separation bed 6; a dust-removing and air-inducing hood 4 is disposed on the upper part of the separation bed 6, an air distribution chamber 3 is disposed on the bottom of the separation bed 6, an air distribution plate 15 is disposed on the upper part of the air distribution chamber 3, the front rack 10 and rear rack 12 are connected to the separation bed 6 via a spring 17 and a spring support 16; a hydraulic cylinder 13 is disposed on the bottom of the rear rack 12 so that the inclination angle of the separation bed 6 is adjustable within a range of 10 to +10; the inclination angle of the separation bed 6 is adjustable within a range of 10 to +10 by adjusting the height of the rear rack 12 with the hydraulic cylinder 13; a feeding distribution device 2 is disposed on the lower part of the impeller feeder 1, and fixed to the separation bed 6; the feeding distribution device 2 is flexibly connected with the impeller feeder 1, and rigidly connected with the separation bed 6; the feeding distribution device 2 comprises a chute 20, with three rows of steel bars 21 being arranged in a crisscross pattern at interval in the chute 20, to break up the large-block material formed under the squeezing action of the impeller feeder 1; two dust-removing and air-inducing hoods 4 and two air distribution chambers 3 are provided on the top and the bottom of the separation bed 6 respectively, the dust-removing and air-inducing hood 4 and air distribution chamber 3 are coated with a heat-insulating coating having a thickness of 2-3 mm on their outer surface respectively, and a separating eccentric shaft vibration exciter 9 is disposed on the lower part at the front end of the separation bed 6; the air distribution plate 15 is composed of upper and lower porous metal clamping plates and asbestos-fiber filter cloth sandwiched between the porous metal clamping plates; an air separator 5 composed of a flow deflection plate and a flow restriction plate is disposed on the bottom of the two air distribution chambers 3 respectively, to promote uniform distribution of the hot air across the entire section of the air distribution chamber; the air separator 5 is connected to a hot air duct 19 coated with a heat insulating coating; a frequency conversion and constant pressure controller is disposed at the inlet of the hot air duct 19 to control the error of air inflow volume into the air distribution chamber 3 within a range of 4%, and the frequency conversion and constant pressure controller comprises a pressure sensor, a microcomputer processing module that receives signals from the pressure sensor, and a frequency converter that controls the rotation speed of a fan, wherein the control signal from the microcomputer processing module is received by the frequency converter, so as to meet the demand for air supply of the hot air duct 19 at a constant pressure and a variable flow rate. The hot air duct 19 connected with the air separator 5 is provided with a flow meter 11 and a control valve 18 designed to control the air inflow volume into the air distribution chamber 3 so as to independently adjust air speed in sections in the direction of separation length. A baffle plate 7 that can move up and down is arranged on the front part of the fine-coal impeller discharger 8 and is connected with the separation bed 6 by threaded connection, so that the material blocking height is adjusted by adjusting a bolt to move the baffle plate 7 up or down in a fixed strip slot.

(8) Operating Process:

(9) the high-temperature hot air in the hot air duct 19 flows through the control valve 18 and flow meter 11 into the air distribution chamber 3, and uniformly passes through the air distribution plate 15 into the separation bed 6 by the air separator 5; at the same time, the input material is fed by the impeller feeder 1 into the feeding distribution device 2, and then the diffuse input material is fed into the separation bed 6 and is fluidized under the synergistic action of vibration and high-temperature hot air. Highly-efficient heat transfer and mass transfer occur between the particles of input material and the high-temperature hot air, and the moisture is taken out of the separation bed by the ascending air flow in the form of water vapor into a dust separator, where dust is collected and clean air with residual heat is discharged for recirculation. As the moisture in the input material is removed, material layering based on a interfered settling process is realized in the vibrating fluidized bed, the waste rocks settle downward, while the fine coal floats upward, and the waste rocks and fine coal are discharged respectively by the waste-rock impeller discharger 14 and fine-coal impeller discharger 8 disposed at the tail end of the separation bed; thus, a de-ashing process is completed and separation is achieved. The quality and quantity of the fine coal product can be controlled by means of the baffle plate 7 disposed on the front part of the fine-coal impeller discharger 8.