A wind separation fluidized bed structure
Through the air-selected fluidized bed structure, the particle size grading of particulate materials is solved, and the grading difficulties caused by clogging of screen holes in existing equipment is achieved, and simple particle size grading and moderate drying effect are achieved.
Patent Information
- Application Number
- CN201710723690.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2017-08-23
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2037-08-23
AI Technical Summary
The existing equipment with screening holes is difficult to effectively grade particulate materials under different working conditions in large-scale industrial production. The reasons are that the bulk materials are of different sizes, different shapes, high water content of fine powder into sludge and debris. The screen hole is blocked and cannot be screened normally.
Design a structure of air-selected fluidized bed, without screening holes, and the particulate material is divided into particle size through air-selected air flow, and the interlayer cavity of air-selected air flow is used to communicate with the coarse particle discharge pipe. The air-selected air flow carries fine particles backflow. The coarse particles fall under gravity, and the particle size division point is changed by adjusting the air-selected flow rate to achieve particle size grading.
The particle size grading of particulate materials is realized, the structure is simplified, and mechanical transmission is not required. The use of flue exhaust gas can be moderately dried during the grading process, making it easy to maintain.
Smart Images
Figure CN109420612B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a fluidized bed structure of an air separation, in particular to a fluidized bed structure for classifying particle sizes of granular materials without using sieve holes. Background Art
[0002] At present, the particle size classification of known granular materials is usually processed by screening. In large-scale industrial production, bulk granular materials are continuously transported by belt conveyors. Under such conditions, conventional screening equipment with sieve holes is not competent for particle size classification. The reason is that bulk materials are of different sizes and shapes, fine powders have high water content and are muddy, and various hard and soft irregular debris entrained in the materials will quickly block the sieve holes, making screening impossible. Summary of the invention
[0003] In order to overcome the deficiency that existing screening equipment with sieve holes cannot perform particle size classification on particulate materials under different working conditions of large-scale industrial production, the present invention provides a bed structure of an air separation fluidized bed, which does not contain sieve holes and classifies the particle size of particulate materials through air separation airflow during the fluidization process.
[0004] The technical solution adopted by the present invention to solve its technical problems is: there is a cavity above the air distribution plate, and the bottom of the air distribution plate is divided into several air chambers. The air distribution plate corresponding to one air chamber is provided with a coarse particle discharge port, and the coarse particle discharge port is connected to a coarse particle discharge pipe below. The middle section of the coarse particle discharge pipe is wrapped with an air selection airflow interlayer cavity. The wall of the coarse particle discharge pipe in the air selection airflow interlayer cavity is provided with several vents. The air selection airflow interlayer cavity is connected to the inside of the coarse particle discharge pipe, and an air selection airflow inlet pipe is connected below the air selection airflow interlayer cavity. Other air chambers can also be provided with the same structure as one air chamber. The air distribution plate corresponding to the last air chamber is provided with a tail discharge port, and the tail discharge port is connected to a tail discharge pipe below.
[0005] When the equipment is running, the granular material is fluidized from a wind chamber on the air distribution plate to the tail discharge pipe. When passing through the coarse particle discharge port, both coarse and fine particles fall into the coarse particle discharge pipe port. At the same time, the air selection airflow enters the cavity above the air distribution plate from the air selection airflow inlet pipe, the air selection airflow interlayer cavity, and the coarse particle discharge pipe. The air selection airflow carries the fine particles that fall into the coarse particle discharge pipe port back to the top of the air distribution plate. The fine particles participate in fluidization and are finally discharged from the tail discharge pipe. The coarse particles that fall into the coarse particle discharge pipe port are overcame by gravity and fall from the coarse particle discharge pipe after overcoming the resistance of the air selection airflow. The particle size dividing point of coarse and fine particles can be changed by changing the flow rate of the air selection airflow. The particle size of the discharged coarse particles increases when the air selection airflow velocity increases, and the particle size of the discharged coarse particles decreases when the air selection airflow velocity decreases. If several air chambers are set with the same structure as one air chamber, several types of particle materials with different particle sizes from coarse to fine can be obtained.
[0006] The air flow for air selection can be air at room temperature or flue exhaust gas. The air flow for air selection using flue exhaust gas can make full use of the waste heat in the flue exhaust gas to moderately dry the particulate material, thus achieving drying during air selection.
[0007] The invention has the advantages that the particle size classification structure is simple, the invention does not contain mechanical transmission, and the use and maintenance are convenient. The flue gas is used to carry out moderate drying during air selection. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The present invention is further described below with reference to the accompanying drawings and examples.
[0009] Figure 1 It is a front view of an embodiment of the present invention.
[0010] Figure 2 2 is a top view of an embodiment of the present invention.
[0011] Figure 3 AA is a cross-sectional view of an embodiment of the present invention.
[0012] In the figure, 1. the first air chamber, 2. the coarse particle discharge port, 3. the coarse particle discharge pipe, 4. the air selection air flow interlayer cavity, 5. the second air chamber, 6. the air distribution plate, 7. the third air chamber, 8. the fourth air chamber, 9. the tail discharge port, 10. the tail discharge pipe, and 11. the air selection air flow inlet pipe. DETAILED DESCRIPTION
[0013] exist Figure 1 , Figure 2 and Figure 3 In the embodiment shown, there is a cavity above the air distribution plate 6, and there are four air chambers below the air distribution plate 6, namely, the first air chamber 1, the second air chamber 5, the third air chamber 7 and the fourth air chamber 8. The air distribution plate corresponding to the first air chamber 1 is provided with a coarse particle discharge port 2, and the coarse particle discharge port 2 is connected to the coarse particle discharge pipe 3 below. The middle section of the coarse particle discharge pipe 3 is covered with an air selection air flow interlayer cavity 4. The wall of the coarse particle discharge pipe 3 in the air selection air flow interlayer cavity 4 is provided with several vents. The air selection air flow interlayer cavity 4 is connected to the inside of the coarse particle discharge pipe 3, and the air selection air flow inlet pipe 11 is connected below the air selection air flow interlayer cavity 4. The second air chamber 5 is also provided with the same structure as the first air chamber 1. The air distribution plate corresponding to the fourth air chamber 8 is provided with a tail discharge port 9, and the tail discharge port is connected to the tail discharge pipe 10 below.
[0014] When the equipment is running, the particulate material is fluidized from a wind chamber 1 on the air distribution plate 6 to the tail discharge pipe 10. When passing through the coarse particle discharge port 2, both coarse and fine particles fall into the coarse particle discharge pipe 3. At the same time, the air selection airflow enters the cavity above the air distribution plate 6 from the air selection airflow inlet pipe 11, the air selection airflow interlayer cavity 4, and the coarse particle discharge pipe 3. The air selection airflow carries the fine particles falling into the coarse particle discharge pipe 3 back to the top of the air distribution plate 6. The fine particles participate in fluidization and are finally discharged from the tail discharge pipe 10. The coarse particles falling into the coarse particle discharge pipe 3 are overcame by gravity The resistance of the air selection airflow falls and is discharged from the coarse particle discharge pipe 3. Changing the flow rate of the air selection airflow can change the particle size boundary of coarse and fine particles. If the air selection airflow velocity increases, the particle size of the discharged coarse particles increases, and if the air selection airflow velocity decreases, the particle size of the discharged coarse particles decreases. The second air chamber 5 is provided with the same discharge structure as the first air chamber 1 , and particle materials of three sizes of coarse, medium and fine can be obtained from the coarse particle discharge pipe 3 of the first air chamber 1 , the coarse particle discharge pipe of the second air chamber 5 and the tail discharge pipe 10 .
[0015] The air flow for air selection can be air at room temperature or flue exhaust gas. The air flow for air selection using flue exhaust gas can make full use of the waste heat in the flue exhaust gas to moderately dry the particulate material, thus achieving drying during air selection.
[0016] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and changes obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.
Claims
1. A wind separation fluidized bed structure, characterized in that: There is a cavity above the air distribution plate, and there are several air chambers below the air distribution plate. A coarse particle discharge port is opened on the air distribution plate corresponding to the first air chamber, and a coarse particle discharge pipe is connected to the coarse particle discharge port. The middle section of the coarse particle discharge pipe is wrapped with an air separation airflow interlayer cavity. Several ventilation holes are opened on the wall of the coarse particle discharge pipe in the air separation airflow interlayer cavity. The air separation airflow interlayer cavity is connected to the inside of the coarse particle discharge pipe, and an air separation airflow inlet pipe is connected to the bottom of the air separation airflow interlayer cavity.
2. The air separation fluidized bed structure according to claim 1 is characterized in that: The air distribution plate corresponding to the last air chamber is provided with a tail discharge port, and the tail discharge port is connected to a tail discharge pipe below.
3. The air separation fluidized bed structure according to claim 1 is characterized in that: The other several wind chambers are arranged with the same structure as the first wind chamber, and several types of granular materials with different particle sizes from coarse to fine can be obtained.