Spreading box with multiple spreading plates for cement clinker production preheater
By using a multi-plate feeding box in the cement clinker production preheater, the raw material undergoes two collisions and dispersions in the rising flue, which solves the problem of uneven raw material dispersion, improves heat exchange efficiency, and reduces coal consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional feeding boxes result in low dispersion of raw materials in the rising flue, severe adhesion of raw materials to the edges of the rising flue, uneven mixing of material and gas, and insufficient heat exchange in the preheater.
The multi-plate feeding box is adopted, including the first and second feeding plates. The raw material undergoes primary and secondary collision dispersion in the rising pipe. The design of the feeding plates improves the dispersion of raw material in the rising flue and enhances the gas-material mixing effect.
It improves the dispersion of raw materials in the rising flue, increases the uniformity of gas-material mixing, enhances the heat exchange efficiency of the preheater, and reduces the coal consumption per unit of clinker.
Smart Images
Figure CN224094925U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to cement production equipment technical field, concretely relates to a kind of multiple material distributing plate formula material distributing box for cement clinker production preheater. BACKGROUND
[0002] Cyclone preheater is important equipment for cement clinker production, and its heat exchange efficiency greatly influences coal consumption. Material distributing box is the key equipment affecting heat exchange efficiency of preheater. There are many types of existing material distributing boxes, but they generally have the shortcoming of poor raw material dispersion, which makes raw material not fully mixed with high-temperature gas flow in the rising flue, resulting in low heat exchange efficiency, small temperature gradient difference of each stage of preheater, high temperature at the outlet of preheater, much heat taken away, and high coal consumption per ton of clinker. The higher the dispersion degree of material in the rising flue, the higher the heat exchange efficiency of preheater. If the dispersion problem of material can be solved, the outlet temperature of the last stage of preheater can be greatly reduced. According to calculation, the standard coal consumption can be reduced by 0.8 kg / t·cl for every 10℃ reduction of the outlet temperature of preheater.
[0003] The traditional material distributing box is installed on the side wall of the rising flue. Raw material is rushed to the material distributing box at a certain speed through the feeding pipe, collides with the side wall in the material distributing box, and then disperses in all directions in the rising flue before being mixed with flue gas in the rising pipe for heat exchange. However, since the flue gas in the rising pipe is rotating gas flow, raw material will move close to the inner wall of the rising flue after entering the rising pipe due to the influence of the rotating gas flow, resulting in poor dispersion of raw material under dynamic conditions, less raw material in the center of the rising pipe, and serious sticking to the edge, which reduces heat exchange efficiency. SUMMARY
[0004] The utility model solves the problem of low dispersion degree of raw material in the rising flue, serious sticking of raw material to the edge in the rising flue, uneven mixing of material and gas, and insufficient heat exchange of preheater.
[0005] The utility model provides a kind of multiple material distributing plate formula material distributing box for cement clinker production preheater, including the feeding pipe and material distributing box being connected with each other, one side of material distributing box is material distributing side, the side of material distributing box is connected with the side of rising pipe, so that the internal space of material distributing box and rising pipe is communicated;The side of material distributing side away from feeding pipe is equipped with first material distributing plate, first material distributing plate extends to the inside of rising pipe, one side of first material distributing plate faces the downstream side direction of rising pipe, the side of first material distributing plate is used to receive raw material from material distributing box, raw material is dispersed in rising pipe after colliding with first material distributing plate once;
[0006] At least one second material distributing plate is arranged on the material distributing side, and the second material distributing plate extends to the inside of the rising pipe. Raw material in the rising pipe collides with the second material distributing plate again under the action of rotating gas flow and is dispersed again in the rising pipe.
[0007] Optionally, the first end opening of the feeding pipe is directed to the downstream end of the ascending pipe, and the last end opening of the feeding pipe is directed to the upstream end of the ascending pipe, and the last end opening of the feeding pipe is connected to the upstream side of the side of the scattering box, and the raw material is input into the scattering box.
[0008] Optionally, the scattering side has four sides, two of which are perpendicular to the axial direction of the ascending pipe, and are called vertical sides; the other two sides are parallel to the axial direction of the ascending pipe, and are called parallel sides.
[0009] The second scattering plate is arranged on any one or both of the parallel sides; and the first scattering plate is arranged on the vertical side at the downstream side of the scattering box.
[0010] Further optionally, the free side of the first scattering plate is directed to the inside of the ascending pipe, and the length of the first scattering plate is not less than the length of the vertical side where the first baffle plate is arranged, so as to intercept the raw material output from the scattering box.
[0011] Further optionally, the length of the second scattering plate is not less than the length of the parallel side, and the width of the second scattering plate is not greater than the radius of the inside of the ascending pipe, so as to avoid hindering the rotational flow of the airflow in the ascending pipe.
[0012] Optionally, one side of the second scattering plate is hinged to the corresponding parallel side, so that the second scattering plate can rotate about the parallel side, and then the angle of ejection of the raw material after colliding with the second scattering plate is adjusted.
[0013] Further optionally, the side of the scattering box where the parallel side is located is called a protection side, and the scattering box has two opposite and parallel protection sides.
[0014] The telescopic device is arranged on the inner wall of any one of the protection sides, and the telescopic device is connected to the second scattering plate on the parallel side of the opposite protection side through a telescopic rod.
[0015] The multi-scattering plate type scattering box has the following beneficial effects:
[0016] The scattering box is provided with two baffle plates, and the raw material output from the scattering box is dispersed twice; the moving direction of the raw material from the scattering box is substantially opposite to the total flow direction of the airflow in the ascending pipe; the raw material is preliminarily dispersed in all directions in the ascending pipe after colliding with the first scattering plate once; then the raw material is mixed with the rotational airflow, and the phenomenon of edge flow occurs; when the raw material approaches the second scattering plate on the inner wall of the ascending pipe, the raw material collides again, which is beneficial to the dispersion of the raw material in the radial direction of the ascending pipe, improves the dispersion degree of the raw material in the ascending flue, increases the amount of material in the center of the ascending pipe, promotes the mixing of the gas and the material, increases the heat exchange area, and improves the heat exchange efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0017] Fig. 1 This is a schematic diagram of the structure of the multi-plate feeding box used in the cement clinker production preheater;
[0018] Fig. 2 This is a schematic diagram of a rotatable second spreading plate.
[0019] In the attached diagram, 1-discharge pipe, 2-spreading box, 3-rising pipe, 4-first spreading plate, 5-second spreading plate, 6-vertical side, 7-parallel side, 8-protective side, 9-telescopic device, 10-telescopic rod. Detailed Implementation
[0020] This embodiment provides a multi-plate feeding box for a cement clinker production preheater, such as... Figs. 1-2 As shown, it includes a feeding pipe 1 and a spreading box 2 connected to each other. One side of the spreading box 2 is the spreading side, which is connected to the side of the rising pipe 3, so that the spreading box 2 and the internal space of the rising pipe 3 are connected. A first spreading plate 4 is provided on the side of the spreading side away from the feeding pipe 1. The first spreading plate 4 extends into the rising pipe 3. One side of the first spreading plate 4 faces the downstream side of the rising pipe 3. This side of the first spreading plate 4 is used to receive raw material from the spreading box 2. After the raw material collides with the first spreading plate 4, it is initially dispersed in the rising pipe 3.
[0021] At least one second spreading plate 5 is provided on the spreading side. The side of the spreading side that connects to the first spreading plate 4 is perpendicular to the side that connects to the second spreading plate 5. The second spreading plate 5 extends into the rising pipe 3. Under the action of the rotating airflow, the raw material in the rising pipe 3 collides with the second spreading plate 5 a second time and is dispersed again in the rising pipe 3.
[0022] Optionally, the first opening of the discharge pipe 1 points to the downstream end of the riser pipe 3, and the last opening of the discharge pipe 1 points to the upstream end of the riser pipe 3. The last opening of the discharge pipe 1 is connected to the upstream side of the spreading box 2, so as to input raw material into the spreading box 2. The movement direction of the raw material in the spreading box 2 is opposite to the movement direction of the airflow in the riser pipe 3.
[0023] Optionally, the material spreading side has four sides, two of which are perpendicular to the axial direction of the rising pipe 3 and are called vertical sides 6; the other two sides are parallel to the axial direction of the rising pipe 3 and are called parallel sides 7.
[0024] A second spreading plate 5 is provided on any one or two parallel sides 7; a first spreading plate 4 is provided on the vertical side 6 located downstream of the spreading box 2.
[0025] Further, the free side of the first spreading plate 4 points to the inside of the ascending pipe 3, the length of the first spreading plate 4 is not less than the length of the vertical side 6 where the first baffle plate is located, and the first spreading plate 4 can intercept the raw materials output from the spreading box 2.
[0026] Further, the length of the second spreading plate 5 is not less than the length of the parallel side, and the width of the second spreading plate 5 is not greater than the radius of the inside of the ascending pipe 3, so as to avoid hindering the rotational flow of the airflow in the ascending pipe 3.
[0027] Optionally, one side of the second spreading plate 5 is hinged to the corresponding parallel side, so that the second spreading plate 5 can rotate around the parallel side as the axis, and then adjust the angle of the raw materials after colliding with the second spreading plate 5.
[0028] Further, the side of the spreading box 2 where the parallel side is located is called the protection side 8, and the spreading box 2 has two opposite and parallel protection sides 8.
[0029] The inner wall of any one of the protection sides 8 is provided with an extension device 9, the extension device 9 is connected to the second spreading plate 5 on the parallel side of the opposite protection side 8 through an extension rod 10, the length of the extension rod 10 adjusts the angle of the second spreading plate 5, so as to adapt to different raw material feeding conditions and different airflow conditions in the ascending pipe 3, and to control the re-dispersion of the raw materials.
Claims
1. A multi-plate feeding box for a cement clinker production preheater, comprising a discharge pipe and a feeding box connected to each other, one side of the feeding box being a feeding side, the feeding side of the feeding box being connected to the side of a rising pipe, thereby enabling communication between the internal space of the feeding box and the rising pipe, characterized in that, A first spreading plate is provided on the side of the spreading side away from the discharge pipe. The first spreading plate extends into the rising pipe. One side of the first spreading plate faces the downstream side of the rising pipe. This side of the first spreading plate is used to receive raw material from the spreading box. After the raw material collides with the first spreading plate, it is initially dispersed in the rising pipe. At least one second spreading plate is provided on the spreading side. The second spreading plate extends into the rising pipe. Under the action of the rotating airflow, the raw material in the rising pipe collides with the second spreading plate a second time and is dispersed again in the rising pipe.
2. The multi-plate spreading box according to claim 1, characterized in that, The first end of the feeding pipe points to the downstream end of the rising pipe, and the last end of the feeding pipe points to the upstream end of the rising pipe. The last end of the feeding pipe is connected to the upstream side of the spreading box, so that raw materials are fed into the spreading box.
3. The multi-plate spreading box according to claim 2, characterized in that, The material spreading side has four sides, two of which are perpendicular to the axial direction of the rising pipe and are called the perpendicular sides; the other two sides are parallel to the axial direction of the rising pipe and are called the parallel sides. A second spreading plate is provided on any one or two parallel sides; a first spreading plate is provided on the vertical side downstream of the spreading box.
4. The multi-plate spreading box according to claim 3, characterized in that, The free side of the first spreading plate points into the rising pipe, and the length of the first spreading plate is not less than the length of the vertical side where the first baffle is located, which can intercept the raw material from the output spreading box.
5. The multi-plate spreading box according to claim 3, characterized in that, The length of the second spreading plate is not less than the length of the parallel side, and the width of the second spreading plate is not greater than the radius inside the rising pipe, so as to avoid obstructing the rotational flow of air in the rising pipe.
6. The multi-plate spreading box according to claim 3, characterized in that, The second spreading plate is hinged to a corresponding parallel side, allowing the second spreading plate to rotate about the parallel side as an axis, thereby adjusting the ejection angle of the raw material after it collides with the second spreading plate.
7. The multi-plate spreading box according to claim 6, characterized in that, The side of the material spreading box containing the parallel side is called the protective side. The material spreading box has two opposing and parallel protective sides. An extension device is provided on the inner wall of any one of the protective sides. The extension device is connected to the second spreading plate on the parallel side of the opposite protective side through an extension rod.