Efficient dust separation device for preheater
By adding a separator at the first-stage cyclone of the preheater, and utilizing a disc, cylinder, and angle steel structure, the problem of low separation efficiency in the preheater was solved, achieving efficient dust separation and improving equipment operational stability and product quality.
Patent Information
- Application Number
- CN202423001944.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-05
AI Technical Summary
In the production of new dry-process cement clinker, the separation efficiency of the first-stage cyclone separator in the preheater is low, resulting in ineffective dust collection, equipment wear, heat loss and unstable raw material quality. In particular, the separation efficiency drops to zero when air leakage is severe.
A separator is added at the first-stage cyclone of the preheater, consisting of a disc, a cylinder, and an angle steel structure. Combined with a refractory castable layer, it forms a highly efficient dust separation device that blocks air leakage and achieves further separation of dust through collision and centrifugal force.
It significantly improves separation efficiency, reduces dust content and temperature in exhaust gas, reduces equipment wear, optimizes energy consumption and product quality, and extends equipment lifespan.
Smart Images
Figure CN223587377U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of separation dust removal, and particularly relates to a dust high-efficiency separation device for a preheater. BACKGROUND
[0002] In the production technology of new dry cement clinker, the separation efficiency of each material heat exchange unit in the preheater has a decisive influence on the overall heat exchange efficiency of the firing system. Theoretical analysis shows that the influence starts from the topmost heat exchange unit and decreases gradually. The separation efficiency of the topmost heat exchange unit has a particularly prominent influence on the system thermal efficiency. The dust collection efficiency of the primary cyclone is about 90%-95%, the dust content is about 20 g / m3, and the exhaust gas temperature is between 300-330 DEG C. 5%-10% of the dust in the exhaust gas discharged by the primary cyclone is not effectively collected, and under the action of the tail exhaust fan, it is extracted through the preheater, and then passes through the kiln tail heat recovery boiler and high-temperature fan impeller, which increases the internal abrasion and reduces the equipment operation life. At the same time, the separation effect is poor, the fly ash is too much, and a large amount of heat is taken away, which increases the calcination coal consumption. In addition, the calcium and silicon contents in the fly ash are high, and once the fly ash enters the raw material homogenizing warehouse or reenters the kiln, it will have a negative impact on the quality and stability of the raw material. Especially during the peak avoidance period of the raw material mill, the influence is more serious, which has a great influence on the clinker calcination.
[0003] During production and operation, the air leakage of the lock valve of the preheater cyclone's downcomer pipe will cause the separated dust to fly again due to the influence of the internal installation structure of the cement kiln preheater. The larger the air leakage, the more serious the dust flying, and the lower the separation efficiency. When the air leakage is less than or equal to 1.85%, the decrease of the separation efficiency is relatively slow, when the air leakage is greater than 1.85%, the decrease of the separation efficiency is relatively fast, and when the air leakage is greater than 8%, the separation efficiency is reduced to zero. Although the lock valve is installed on the cyclone downcomer to reduce air leakage, the lock valve will not lock tightly due to the jamming of the skin material, causing air leakage, and the smoke dust entering the rear will easily stick to the air inlet position and affect the exhaust. UTILITY MODEL CONTENTS
[0004] In order to solve the above technical problems, the utility model provides a dust high-efficiency separation device for a preheater, which comprises a preheater, the preheater is provided with a primary cyclone, the inside of the primary cyclone is provided with a separator, the separator comprises a disc, a cylinder concentrically arranged on the upper side of the disc, an angle steel one and four angle steel twos, a cross-shaped reinforcing steel plate is fixedly arranged in the cylinder, a refractory castable layer one is poured in the inside of the cylinder, the angle steel one is cross-shaped welded on the lower side of the center of the disc, one end of the angle steel two is fixedly connected with the angle steel one in correspondence, and the other end is fixedly connected with the inner wall of the primary cyclone perpendicularly.
[0005] By adding a separator at the cone of the preheater first cyclone, on one hand, the self-cyclone generated inside the first cyclone can carry the dust collected at the bottom of the cone, and on the other hand, the separator can partially block the air leakage from the lower pipe connected to the lower end of the first cyclone, thereby effectively reducing the dust content and the gas temperature at the outlet, avoiding dust residue, and achieving high efficiency, stability, and convenience.
[0006] Further, the inner wall of the first cyclone is cast with a refractory castable layer two, the connection between the angle steel two and the inner wall of the first cyclone is broken through the refractory castable layer two, and the temperature of the waste gas entering the first cyclone is between 300° and 400°. In order to prevent the high-temperature gas from damaging the cone of the first cyclone, a refractory castable layer two needs to be cast on the inner wall of the first cyclone.
[0007] Further, the connection between the disc, the cylinder, the angle steel one, and the angle steel two and the inner wall of the first cyclone is welded and fixed, and the disc, the cylinder, the angle steel one, and the angle steel two are all made of different types of steel plates, and the connection between them is selected by welding.
[0008] Further, the refractory castable layer one is flush with the upper edge of the cylinder, and the refractory castable layer together supports the cylinder.
[0009] Further, the cross section of the angle steel one and the angle steel two is L-shaped, and the cross section of the angle steel one and the angle steel two corresponds to the connection.
[0010] The utility model also includes other devices or components that can enable the device for preheater dust efficient separation to be used normally, which are all conventional technical means in the field. In addition, the first cyclone and the disc in the utility model are both made by using conventional technical means in the field.
[0011] The working principle of the utility model is that the separator in the device is installed at the part of the first cyclone with the worst separation effect of the preheater, and the four angle steels two of the separator are supported and welded on the side wall of the first cyclone. After the device is used, the dust in the first cyclone can be prevented from being raised again due to the air leakage at the bottom of the lower pipe; when the dust rises upward by cyclone, it collides with the separator, realizes the function of buffering and separating the dust again, and the dust is discharged through the lower pipe again under the influence of the collision force and the centrifugal force.
[0012] The utility model has the advantages that the device can reduce the dust content in the waste gas and the waste gas temperature, the separator can effectively inhibit the flying dust phenomenon inside the first cyclone, and the separation efficiency can be significantly improved; the structure of the separator is simple, there is no moving part, the operation range is wide, it is not limited by temperature and pressure, and it is convenient to install; the dust content in the system is reduced, which can improve the energy consumption and product quality; meanwhile, the amount of discharged dust is reduced, which can reduce the abrasion of the high-temperature fan shell, impeller, and subsequent power generation boiler, and prolong the service life of the equipment. Attached Figure Description
[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0014] Fig. 1 This is a schematic diagram of the overall structure of this utility model.
[0015] Fig. 2 This is a top view of the separator in this utility model.
[0016] Fig. 3 This is a cross-sectional schematic diagram of the separator in this utility model.
[0017] Fig. 4 This is a schematic diagram of the cross-sections of angle steel one and angle steel two in this utility model.
[0018] Fig. 5 This is a schematic diagram of the operation of the first-stage cyclone without a separator in this utility model.
[0019] Fig. 6 This is a schematic diagram of the operation of the first-stage cyclone separator in this utility model. Detailed Implementation
[0020] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. This description is merely for explaining the present invention and is not intended to limit it. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the protection scope of the present invention.
[0021] Example
[0022] like Figs. 1-6 As shown, the present invention provides a high-efficiency dust separation device for a preheater, including a preheater. The preheater is equipped with a first-stage cyclone. A separator is installed inside the first-stage cyclone. The separator includes a disc 1, a cylinder 2 concentrically arranged on the upper side of the disc 1, an angle steel 3, and four angle steels 4. A cross-shaped reinforcing steel plate 5 is fixedly installed inside the cylinder 2, and a refractory castable layer 6 is poured inside the cylinder 2. The angle steel 3 is welded in a cross shape to the lower center of the disc 1. One end of the angle steel 4 is fixedly connected to the angle steel 3, and the other end is fixedly connected vertically to the inner wall of the first-stage cyclone.
[0023] By adding the separator at the cone of the preheater first cyclone, the self-cyclone generated in the first cyclone can be reduced, the collected dust can be prevented from being taken up, and the upward air leakage of the lower discharge pipe connected to the lower end of the first cyclone can be partially blocked, so that the dust amount and the gas temperature at the outlet can be effectively reduced, dust residues can be avoided, and high efficiency, stability, convenience and the like can be achieved.
[0024] As a further measure of the utility model, the inner wall of the first cyclone is cast with a refractory castable layer two 7, the connection between the angle steel two 4 and the inner wall of the first cyclone breaks the refractory castable layer two 7, the temperature of the waste gas entering the first cyclone is between 300° and 400°, in order to prevent the high-temperature gas from damaging the first cyclone, the refractory castable layer two 7 needs to be cast on the inner wall of the first cyclone; the disc 1, the cylinder 2, the angle steel one 3 and the angle steel two 4 are all fixed between the inner wall of the first cyclone by welding, the disc 1, the cylinder 2, the angle steel one 3 and the angle steel two 4 are made of different types of steel plates, and the welding mode is selected for the connection between them; the cylinder 2 is cast with a refractory castable layer one 6 inside, and the refractory castable layer one 6 is flush with the upper edge of the cylinder 2, and the refractory castable layer one 6 plays a role in supporting the cylinder 2; the cross section of the angle steel one 3 and the angle steel two 4 is L-shaped, and the cross section of the angle steel one 3 and the angle steel two 4 is correspondingly connected.
[0025] The working principle of the utility model is that the separator in the device is installed at the first cyclone part with the worst separation effect of the preheater, and the four angle steels two 4 of the separator are supported and welded on the side wall of the first cyclone, after the device is used, the dust in the first cyclone is lifted again due to the influence of the air leakage at the bottom of the discharge pipe, when the dust rises upward by cyclone, collides with the separator, realizes the function of buffering and separating dust again, and under the influence of the collision force and the centrifugal force, the dust is discharged again through the discharge pipe.
[0026] The above has described the embodiments of the utility model, the above description is exemplary, is not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments.
Claims
1. A high-efficiency dust separation device for a preheater, comprising a preheater, wherein the preheater is provided with a primary cyclone separator, characterized in that: The first-stage cyclone is equipped with a separator, which includes a disc, a cylinder concentrically arranged on the upper side of the disc, angle steel one and four angle steel two. A cross-shaped reinforcing steel plate is fixed inside the cylinder, and a refractory castable layer one is poured inside the cylinder. Angle steel one is welded in a cross shape to the lower center of the disc. One end of angle steel two is fixedly connected to angle steel one, and the other end is fixedly connected vertically to the inner wall of the first-stage cyclone.
2. The dust separation device for a preheater according to claim 1, characterized in that: The inner wall of the primary cyclone is coated with a second layer of refractory castable.
3. The high-efficiency dust separation device for a preheater according to claim 1, characterized in that: The disc, cylinder, angle steel one, and angle steel two are all welded and fixed to the inner wall of the primary cyclone.
4. The high-efficiency dust separation device for a preheater according to claim 1, characterized in that: The refractory castable layer is flush with the upper edge of the cylinder.
5. The high-efficiency dust separation device for a preheater according to claim 1, characterized in that: The cross-sections of angle steel one and angle steel two are L-shaped.