An expanded diameter low resistance high efficiency cyclone

Abstract

The present invention relates to a new type of dry cement clinker production equipment, and specifically discloses an expanding diameter type low-resistance and high-efficiency cyclone, comprising a volute with an air inlet, a cylindrical section, an expanding diameter section and a conical section which are arranged in sequence below the volute, an inner cylinder arranged at the center of the volute wrap, the upper end of the inner cylinder extending to the outside of the volute and forming an air outlet, and a discharge port arranged below the conical section; wherein the expanding diameter section comprises an expanding diameter section upper wall connected to the lower end of the cylindrical section and an expanding diameter section column connected to the upper end of the conical section; wherein the inner diameter of the expanding diameter section column is greater than the inner diameter of the cylindrical section; the height of the expanding diameter section column is at least 0.1 times the inner diameter of the cylindrical section; the angle between the expanding diameter section upper wall and the horizontal plane is between 0° and 70° and is not 0°. The expanding diameter type low-resistance and high-efficiency cyclone adopts a "unique column expanding diameter structure", which improves the separation efficiency by 1-3% compared with the traditional cyclone, and reduces the pressure loss coefficient by 15-30% compared with the traditional cyclone.

Description

Technical Field

[0001] The invention relates to novel dry process cement clinker production equipment, in particular to an expanded diameter low-resistance and high-efficiency cyclone. Background Art

[0002] The cement production process is a high energy consumption process. The technical problems that need to be solved urgently in the development of the cement industry are energy saving, consumption reduction, environmental protection, improving cement quality and labor productivity, and taking the path of sustainable development. The clinker burning part of the new dry process cement kiln burning technology mainly consists of the following aspects: pre-decomposition system (preheater of multi-stage cyclone); pre-decomposition technology outside the kiln (decomposition furnace); clinker calcination technology (rotary kiln); clinker cooling technology (cooler).

[0003] Clinker production process: Materials prepared in a certain proportion are fed from the top of the preheater, preheated by the cyclone preheater and then enter the decomposition furnace, where they are decomposed and then enter the rotary kiln for calcination, and then enter the grate cooler for cooling, and finally we get the clinker we need.

[0004] Our research found that the key to reducing the power consumption and heat consumption of cement burning systems lies in reducing the internal and external circulation of materials in the cement burning system, improving the system's heat exchange efficiency, and reducing resistance losses. In the design of traditional cyclones, the gas-solid separation efficiency is mainly improved by increasing the wind speed, but this method will inevitably cause the system resistance to increase while increasing the wind speed, increasing the system's energy consumption. Therefore, if the cyclone structure can be optimized and its efficiency in separating materials can be improved, it will be of great significance to energy saving and consumption reduction in the cement production process. Summary of the invention

[0005] The present invention is based on the above-mentioned technical status. We use CFD model experiments to deeply analyze the characteristics of gas movement in the cyclone, and reduce system resistance and improve gas-solid separation efficiency by optimizing the cyclone structure.

[0006] In order to achieve the above-mentioned purpose, the present invention provides an expanding diameter low-resistance and high-efficiency cyclone, comprising a volute with an air inlet, a cylindrical section, an expanding diameter section and a conical section located below the volute and arranged in sequence from top to bottom, and also comprising an inner cylinder arranged at the center of the volute wrap, the upper end of the inner cylinder extending to the outside of the volute and forming an air outlet, and a discharge port being arranged below the conical section; wherein the expanding diameter section comprises an expanding diameter section upper wall connected to the lower end of the cylindrical section and an expanding diameter section column connected to the upper end of the conical section; wherein the inner diameter d2 of the expanding diameter section column is greater than the inner diameter d1 of the cylindrical section; the height h5 of the expanding diameter section column is at least 0.1 times the inner diameter d1 of the cylindrical section; the angle β between the expanding diameter section upper wall and the horizontal plane is between 0° and 70° and is not 0°.

[0007] Preferably, the inner diameter d2 of the expanded diameter section cylinder is 1.1 to 1.3 times the inner diameter d1 of the cylindrical section; the height h5 of the expanded diameter section cylinder is 0.1 to 1 times the inner diameter d1 of the cylindrical section; the total length h from the upper end of the volute to the lower end of the cone section is 2.5 to 3.5 times the inner diameter d1 of the cylindrical section.

[0008] Preferably, the angle β between the upper wall of the expanded diameter section and the horizontal plane is 35° to 60°.

[0009] Preferably, the inner diameter d0 of the inner cylinder is 0.45 to 0.55 times the inner diameter d1 of the cylindrical section.

[0010] Preferably, the length h1 from the top of the volute to the lower end of the inner cylinder is 0.95-1.15 times the height h2 of the volute.

[0011] Preferably, the inner diameter d4 of the feed opening is 0.1-0.3 times the inner diameter d1 of the cylindrical section.

[0012] Preferably, the angle α between the outer wall of the cone section and the horizontal plane is 55° to 70°.

[0013] Preferably, the air inlet is a pentagonal structure formed by a cut-corner rectangle; the width of the air inlet is 1250mm-1750mm.

[0014] Preferably, the inner diameter d1 of the cylindrical segment is 3500 mm to 5500 mm.

[0015] Preferably, the wrapping angle of the volute is 240°-300°.

[0016] In the present invention, the expansion section includes an expansion section upper wall connected to the lower end of the cylindrical section and an expansion section column connected to the upper end of the conical section; wherein the inner diameter d2 of the expansion section column is greater than the inner diameter d1 of the cylindrical section; the height h5 of the expansion section column is at least 0.1 times the inner diameter d1 of the cylindrical section; the angle β between the expansion section upper wall and the horizontal plane is between 0° and 70° and is not 0°. The main features of the cyclone are: a "unique column expansion structure" or the expansion section is designed below the cylindrical section; the expansion of the expansion section is conducive to reducing wind speed, accelerating gas-solid separation, and allowing materials to be collected faster; the expansion of the expansion section reduces the gas "return" distance and reduces resistance loss; and the angle β between the expansion section upper wall and the horizontal plane is between 0° and 70° and is not 0°, that is, the cylindrical expansion adopts a transitional diameter change, which reduces the impact on the gas flow field and material flow field of the main body.

[0017] Through the above analysis, it can be known that the expanded diameter low-resistance and high-efficiency cyclone of the present invention adopts an expanded diameter structure during the rotation of materials and gases. On the basis of cyclone dust collection, the wind speed is reduced, the gas and solid are separated again, and the dust collection efficiency is improved. In addition, the kinetic energy of the gas can be further reduced, and the gas is discharged from the cyclone under a relatively small negative pressure (suction) of the upper cyclone. The expanded diameter low-resistance and high-efficiency cyclone adopts a "unique column expansion structure", which increases the separation efficiency by 1-3% compared with the traditional cyclone, and reduces the pressure loss coefficient by 15-30% compared with the traditional cyclone. The cyclone of the present invention is applied to the pre-decomposition system at the tail of the clinker production line kiln, which effectively improves the gas-solid separation efficiency and reduces the resistance loss in the cyclone, making the resistance loss greatly reduced compared with the traditional cyclone.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of an expanded-diameter low-resistance and high-efficiency cyclone;

[0021] Figure 2 This is a schematic diagram of the working principle of the expanded-diameter low-resistance and high-efficiency cyclone;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of an expanded-diameter low-resistance and high-efficiency cyclone.

[0023] Description of Reference Numerals

[0024] 1 vortex casing 2 air inlet

[0025] 3 cylindrical section 4 expanded diameter section cylindrical

[0026] 5 cone section 6 inner tube

[0027] 7 air outlet 8 feeding port

[0028] 9 Upper wall of the expansion section DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0030] In the present invention, unless otherwise stated, directional words such as "upper, lower, bottom, side, top" contained in the terms merely represent the orientation of the terms in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the terms.

[0031] like Figure 1-Figure 3 As shown, the present invention provides an expanding diameter type low-resistance and high-efficiency cyclone, comprising a volute 1 with an air inlet 2, a cylindrical section 3, an expanding diameter section and a conical section 5 located below the volute 1 and arranged in sequence from top to bottom, and also comprising an inner cylinder 6 arranged at the center of the volute 1 wrapping, the upper end of the inner cylinder 6 extends to the outside of the volute 1 and is formed with an air outlet 7, and a discharge port 8 is arranged below the conical section 5; wherein the expanding diameter section comprises an expanding diameter section upper wall 9 connected to the lower end of the cylindrical section 3 and an expanding diameter section column 4 connected to the upper end of the conical section 5; wherein the inner diameter d2 of the expanding diameter section column 4 is greater than the inner diameter d1 of the cylindrical section 3; the height h5 of the expanding diameter section column 4 is at least 0.1 times the inner diameter d1 of the cylindrical section 3; the angle β between the expanding diameter section upper wall 9 and the horizontal plane is between 0° and 70° and is not 0°.

[0032] Dust-laden gas (the dust content in the dust-laden gas is about 1000g / Nm 3 ~1300g / Nm 3, air flow speed 15m / s~25m / s) enters the cyclone volute 1 through the air inlet 2, and forms a high-speed swirl under the guidance of the volute 1, which spirals downward. In this process, the material moves downward along the side wall in a spiral under the action of centrifugal force and the friction of the side wall of the cyclone. When the dust-laden gas reaches the cone section 5 of the cyclone, the gas "returns" and moves upward under the reflection of the cone section 5, and is discharged from the exhaust pipe through the inner tube 6, while the dust continues to move downward along the side wall of the cone section 5. The material and the exhaust gas of a conventional cyclone enter the cyclone volute together. Under the action of centrifugal force, the material is thrown at the side wall of the cyclone at high speed, slides down along the side wall, and is finally collected. The exhaust gas gradually loses kinetic energy during the rotation process, and finally rotates and rises at the center of the volute and is discharged at the top of the volute. In the present invention, the expansion section includes an expansion section upper wall 9 connected to the lower end of the cylindrical section 3 and an expansion section column 4 connected to the upper end of the conical section 5; wherein the inner diameter d2 of the expansion section column 4 is greater than the inner diameter d1 of the cylindrical section 3; the height h5 of the expansion section column 4 is at least 0.1 times the inner diameter d1 of the cylindrical section 3; the angle β between the expansion section upper wall 9 and the horizontal plane is between 0° and 70° and is not 0°. The main features of the cyclone are: a "unique column expansion structure" or an expansion section is designed below the cylindrical section 3; the expansion of the expansion section is conducive to reducing the wind speed, accelerating the gas-solid separation, and allowing the material to be collected faster; the expansion of the expansion section reduces the gas "return" distance and reduces the resistance loss; and the angle β between the expansion section upper wall 9 and the horizontal plane is between 0° and 70° and is not 0°, that is, the cylindrical expansion adopts a transitional diameter change, which reduces the impact on the gas flow field and material flow field of the main body. Through the above analysis, it can be known that the expanded diameter low-resistance and high-efficiency cyclone structure of the present invention adopts an expanded diameter structure during the rotation of materials and gases. On the basis of cyclone dust collection, the wind speed is reduced, and the gas and solid are separated again, thereby improving the dust collection efficiency. In addition, the kinetic energy of the gas can be further reduced, and the gas is discharged from the cyclone under the condition of a small negative pressure (suction) of the upper cyclone. The expanded diameter low-resistance and high-efficiency cyclone adopts a "unique column expansion structure", which increases the separation efficiency by 1-3% compared with the traditional cyclone, and reduces the pressure loss coefficient by 15-30% compared with the traditional cyclone.

[0033] In a preferred embodiment of the present invention, the inner diameter d2 of the expanded diameter section cylinder 4 is 1.1 to 1.3 times the inner diameter d1 of the cylindrical section 3; the height h5 of the expanded diameter section cylinder 4 is 0.1 to 1 times the inner diameter d1 of the cylindrical section 3; the angle β between the expanded diameter section upper wall 9 and the horizontal plane is between 0° and 70° and is not 0°. Further, the total length h from the upper end of the volute 1 to the lower end of the cone section 5 is 2.5 to 3.5 times the inner diameter d1 of the cylindrical section 3, so that the wind speed is reduced, the gas and solid are separated again, and the dust collection efficiency is improved. In addition, the kinetic energy of the gas can be further reduced, and the gas is discharged from the cyclone under the condition of a small negative pressure (suction) of the upper cyclone.

[0034] In a preferred embodiment of the present invention, in order to further enhance the influence of the bulk gas flow field and the material flow field to improve the separation efficiency and reduce the pressure loss, the angle β between the upper wall 9 of the expanded diameter section and the horizontal plane is 0° to 70°, and the optimal range is 35° to 60°.

[0035] In a preferred embodiment of the present invention, in order to accelerate gas-solid separation and facilitate the "return" distance and reduce resistance loss, the inner diameter d0 of the inner tube 6 is 0.45 to 0.55 times the inner diameter d1 of the cylindrical section 3.

[0036] In a preferred embodiment of the present invention, in order to further accelerate gas-solid separation and facilitate airflow "return" to reduce resistance loss, the length h1 from the top of the volute 1 to the lower end of the inner cylinder 6 is 0.95-1.15 times the height h2 of the volute 1.

[0037] In a preferred embodiment of the present invention, in order to facilitate material discharge and facilitate airflow "return" to reduce resistance loss, the inner diameter d4 of the material discharge port 8 is 0.1-0.3 times the inner diameter d1 of the cylindrical section 3.

[0038] In a preferred embodiment of the present invention, in order to facilitate material feeding and facilitate airflow "return" to reduce resistance loss, the angle α between the outer wall of the cone section 5 and the horizontal plane is 55° to 70°.

[0039] In a preferred embodiment of the present invention, the air inlet 2 is a pentagonal structure formed by a cut-corner rectangle; the width of the upper end of the air inlet 2 is 1250mm-1750mm, and the width of the lower end is 200mm-1200mm.

[0040] In the above technical solution, the volute 1 is a volute-shaped structure formed by wrapping the air inlet duct clockwise or counterclockwise and fixed on the cyclone column section, one end of which is tangent to the cylindrical section 3 and the other end is the air inlet 2. In the preferred setting, the wrapping angle of the volute 1 is 240°-300°.

[0041] Generally, the diameter d1 of the cyclone of a 5000t / d production line is between 3500mm and 5500mm, the inlet is a cut-angle pentagon, the height is 2500mm to 3500mm, and the inlet wind speed is controlled at 15m / s to 25m / s.

[0042] In the above technical solution, the cyclone cylinder of the present invention is a hollow cylinder, which is composed of a volute 1, a cylindrical section 3, an expanded diameter section and a conical section 5, and an inner cylinder 6 extending into the hollow cylinder.

[0043] In the above technical solution, descriptions such as the inner diameter d1 are conventional simplified descriptions in the art, meaning the length d1 of the inner diameter.

[0044] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0045] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0046] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An expanded diameter low resistance high efficiency cyclone, characterized in that: It comprises a volute (1) having an air inlet (2), a cylindrical section (3), an expanded diameter section and a conical section (5) which are arranged in sequence from top to bottom and are located below the volute (1), and an inner cylinder (6) which is arranged at the center of the wrapping of the volute (1), the upper end of the inner cylinder (6) extending to the outside of the volute (1) and forming an air outlet (7), and a discharge port (8) is arranged below the conical section (5); The expanded diameter section comprises an expanded diameter section upper wall (9) connected to the lower end of the cylindrical section (3) and an expanded diameter section column (4) connected to the upper end of the conical section (5); The inner diameter d2 of the expanded diameter section cylinder (4) is 1.1 to 1.3 times the inner diameter d1 of the cylindrical section (3); The inner diameter d0 of the inner cylinder (6) is 0.45 to 0.55 times the inner diameter d1 of the cylindrical section (3); The inner diameter d4 of the feed opening (8) is 0.1-0.3 times the inner diameter d1 of the cylindrical section (3); The height h5 of the expanded diameter section cylinder (4) is 0.1 to 1 times the inner diameter d1 of the cylindrical section (3); The total length h from the upper end of the volute (1) to the lower end of the conical section (5) is 2.5 to 3.5 times the inner diameter d1 of the cylindrical section (3); The length h1 from the top of the volute (1) to the lower end of the inner cylinder (6) is 0.95 to 1.15 times the height h2 of the volute (1); The included angle β between the upper wall (9) of the expanded diameter section and the horizontal plane is 35° to 60°; The angle α between the outer wall of the cone section (5) and the horizontal plane is 55° to 70°.

2. The expanded diameter low resistance high efficiency cyclone according to claim 1, characterized in that: The air inlet (2) is a pentagonal structure formed by a cut-corner rectangle; the width of the air inlet (2) is 1250 mm-1750 mm.

3. The expanded diameter low resistance high efficiency cyclone according to any one of claims 1 to 2, characterized in that: The inner diameter d1 of the cylindrical section (3) is 3500 mm to 5500 mm.

4. The expanded diameter low resistance high efficiency cyclone according to any one of claim 1, characterized in that: The wrapping angle of the volute (1) is 240°-300°.

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