Unpowered drying system utilizing waste heat of rotary kiln

Abstract

The utility model discloses an unpowered drying system utilizing waste heat of a rotary kiln. The height of the left side of the rotary kiln is larger than that of the right side of the rotary kiln; the conveying heat gathering device is a spiral coil pipe, is arranged on the outer wall of the rotary kiln in a sleeving manner, and is provided with a feeding hole and a discharging hole through which blocky or powdery materials enter and flow out; the feeding port is formed in the top of the rotary kiln and close to the left side of the rotary kiln, the discharging port is formed in the bottom of the rotary kiln and close to the right side of the rotary kiln, and the axis direction of the feeding port and the axis direction of the discharging port are parallel to the central axis of the rotary kiln. The multiple exhaust devices are arranged on the side, away from the rotary kiln, of the conveying and heat gathering device and are configured to exhaust water vapor generated in the drying process of the materials and exhaust waste gas after the waste gas is treated. Therefore, radiant heat of the rotary kiln is used for drying and conveying materials in the heat gathering device, rotation of the rotary body is used as driving force, a driving device of drying equipment is not used, energy consumption is reduced, and carbon emission is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of waste heat utilization, and in particular to a non-powered drying system for utilizing waste heat from a rotary kiln. Background Art

[0002] A rotary kiln is a rotating calcining kiln, which is a high-temperature processing equipment used to heat materials to a high temperature (calcination) in a continuous process. Rotary kilns can be divided into cement kilns, metallurgical chemical kilns and lime kilns according to the materials they process. A large amount of waste heat is generated during the operation of the rotary kiln, and direct discharge will cause a waste of resources.

[0003] At present, material drying requires a heat source, material transportation requires a drive device, and drying exhaust gas requires a dust removal device. Existing dryers have several modes such as belt, drum, box, and tower drying; the heat source is coal, electricity, gas, etc.; the hot air flow moves forward from the tail, and transfers heat through heat conduction, convection, and radiation; the heat energy is directly transferred to the material, so that the moisture of the material is continuously evaporated in the cylinder, and the dust removal device extracts a large amount of moisture and wet air flow, and promotes the movement of the material through internal spiral stirring, sweeping, and copying to complete the drying process. Therefore, the existing material drying process is relatively complicated and consumes a lot of energy. Utility Model Content

[0004] The embodiment of the present application provides a non-powered drying system that utilizes the waste heat of a rotary kiln, thereby solving the technical problems in the prior art that the direct discharge of the waste heat of the rotary kiln causes waste of resources and the existing material drying process is relatively complicated.

[0005] The embodiment of the present application provides a non-powered drying system for utilizing waste heat from a rotary kiln, comprising a conveying and heat-collecting device and a plurality of exhaust devices; the rotary kiln is arranged at an angle, and the height of the left side is greater than the height of the right side; the conveying and heat-collecting device is a spiral coil, and is sleeved on the outer wall of the rotary kiln, and the conveying and heat-collecting device is provided with a feed port and a discharge port for block or powder materials to enter and flow out; the feed port is arranged at the top of the rotary kiln, and is close to the left side of the rotary kiln, and the discharge port is arranged at the bottom of the rotary kiln, and is close to the right side of the rotary kiln, and the axial directions of the feed port and the discharge port are parallel to the central axis of the rotary kiln; a plurality of exhaust devices are arranged on the side of the conveying and heat-collecting device away from the rotary kiln, and are configured to discharge water vapor generated during the drying process of the material and discharge the waste gas after treatment.

[0006] In a possible implementation, the angle between the central axis of the rotary kiln and the horizontal plane is 3-4°.

[0007] In a possible implementation, the unpowered drying system for utilizing waste heat from a rotary kiln further includes a fixing device; the fixing device is disposed between the transporting and heat collecting device and the rotary kiln.

[0008] In a possible implementation, the unpowered drying system utilizing waste heat from the rotary kiln further includes a filter; and the exhaust device is provided with a filter.

[0009] In a possible implementation, the filter screen is made of metal.

[0010] In a possible implementation, the unpowered drying system for utilizing waste heat from the rotary kiln further includes a heat-insulating layer; the heat-insulating layer is disposed on a side of the heat-conveying and heat-collecting device away from the rotary kiln.

[0011] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects:

[0012] The unpowered drying system for utilizing the waste heat of a rotary kiln provided in the embodiment of the present application includes a conveying and heat collecting device and an exhaust device. In actual operation, the rotary kiln rotates, driving the conveying and heat collecting device to rotate; the feed port of the conveying and heat collecting device is set at a high place, and the spiral motion is used to stir and convey the material, and the material is discharged through the discharge port of the conveying and heat collecting device; the water vapor and waste gas generated in the drying process are treated and discharged by the exhaust device. The temperature on the right side of the rotary kiln is higher than the temperature on the left side. The rotary kiln is tilted, which can increase the temperature of the material from low to high, which is beneficial to the drying of the material. Therefore, the unpowered drying system for utilizing the waste heat of a rotary kiln in the embodiment of the present application utilizes the radiant heat of the rotary kiln to dry the material in the conveying and heat collecting device, and utilizes the rotation of the rotating body as the driving force, thereby avoiding the use of the driving device of the drying equipment, reducing energy consumption, and reducing carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 A schematic diagram of the structure of an unpowered drying system for utilizing waste heat from a rotary kiln provided in an embodiment of the present application;

[0015] Figure 2 for Figure 1 A local enlarged view of point A;

[0016] Figure 3 A left view of the unpowered drying system for utilizing waste heat from a rotary kiln provided in an embodiment of the present application.

[0017] Icons: 1- conveying and heat collecting device; 11- feed port; 12- discharge port; 2- exhaust device; 3- filter screen; 4- fixing device; 5- rotary kiln. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0020] The present application embodiment provides a non-powered drying system utilizing waste heat from a rotary kiln, such as Figures 1 to 3 As shown. The unpowered drying system for utilizing waste heat from a rotary kiln includes a conveying and heat-collecting device 1 and a plurality of exhaust devices 2. The rotary kiln 5 is arranged at an inclination, and the height of the left side is greater than the height of the right side. The conveying and heat-collecting device 1 is a spiral coil, and is sleeved on the outer wall of the rotary kiln 5. The conveying and heat-collecting device 1 is provided with a feed port 11 and a discharge port 12 for block or powder materials to enter and flow out. The feed port 11 is arranged at the top of the rotary kiln 5, and is close to the left side of the rotary kiln 5. The discharge port 12 is arranged at the bottom of the rotary kiln 5, and is close to the right side of the rotary kiln 5. The axial directions of the feed port 11 and the discharge port 12 are parallel to the central axis of the rotary kiln 5. A plurality of exhaust devices 2 are arranged on the side of the conveying and heat-collecting device 1 away from the rotary kiln 5, and are configured to discharge the water vapor generated by the material during the drying process, and to discharge the waste gas after treatment.

[0021] It should be noted that the unpowered drying system for utilizing the waste heat of the rotary kiln provided in the embodiment of the present application includes a conveying and heat collecting device 1 and an exhaust device 2. In actual operation, the rotary kiln 5 rotates, driving the conveying and heat collecting device 1 to rotate; the feed port 11 of the conveying and heat collecting device 1 is set at a high place, and the spiral motion is used to stir and convey the material, and the material is discharged through the discharge port 12 of the conveying and heat collecting device 1; the water vapor and waste gas generated during the drying process are treated and discharged by the exhaust device 2. The temperature on the right side of the rotary kiln 5 is higher than the temperature on the left side thereof. The rotary kiln 5 is tilted, so that the temperature of the material can be raised from low to high, which is conducive to the drying of the material. Therefore, the unpowered drying system for utilizing the waste heat of the rotary kiln in the embodiment of the present application utilizes the radiant heat of the rotary kiln 5 to dry the material in the conveying and heat collecting device 1, and utilizes the rotation of the rotating body as the driving force, thereby avoiding the use of the driving device of the drying equipment, reducing energy consumption, and reducing carbon emissions.

[0022] In the embodiment of the present application, the angle between the central axis of the rotary kiln 5 and the horizontal plane is 3-4°.

[0023] It should be noted that during the operation of the rotary kiln 5, the temperature on the right side of the rotary kiln 5 is higher than that on the left side thereof, and the angle between the rotary kiln 5 and the horizontal plane is 3-4°, which can facilitate the discharge of materials on the one hand; on the other hand, it can increase the temperature of the materials from low to high, which is beneficial to the drying of the materials.

[0024] In the embodiment of the present application, the unpowered drying system for utilizing waste heat of the rotary kiln further includes a fixing device 4. The fixing device 4 is arranged between the conveying and heat collecting device 1 and the rotary kiln 5. The rotary kiln 5 drives the conveying and heat collecting device 1 to rotate through the fixing device 4.

[0025] In the embodiment of the present application, the unpowered drying system utilizing the waste heat of the rotary kiln further includes a filter 3. The exhaust device 2 is provided with a filter 3, which can prevent the material from spilling on the one hand, and can also play a role in dust removal and exhaust on the other hand.

[0026] In the embodiment of the present application, the filter screen 3 is made of metal.

[0027] In the embodiment of the present application, the unpowered drying system utilizing the waste heat of the rotary kiln further comprises an insulation layer. The insulation layer is arranged on the side of the conveying and heat collecting device 1 away from the rotary kiln 5. The insulation layer of the embodiment of the present application minimizes the loss of heat in the conveying and heat collecting device 1, which is beneficial to material drying.

[0028] In the prior art, waste heat recovery of rotary kiln 5 is limited to heating water and gas, with a narrow scope of application and low utilization rate of radiant heat of rotary kiln 5. Waste heat recovery of rotary kiln 5 for heating water is applicable only in northern China and is only applicable in winter due to seasonal influences.

[0029] The non-powered drying system utilizing the waste heat of the rotary kiln of the present application is not affected by regions and seasons.

[0030] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0031] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A non-powered drying system utilizing waste heat from a rotary kiln, characterized in that: It comprises a heat transporting and collecting device (1) and a plurality of exhaust devices (2); The rotary kiln (5) is arranged to be inclined, and the height of the left side thereof is greater than the height of the right side thereof; The conveying and heat-collecting device (1) is a spiral coil and is sleeved on the outer wall of the rotary kiln (5). The conveying and heat-collecting device (1) is provided with an inlet (11) and an outlet (12) for block or powder materials to enter and flow out. The feed port (11) is arranged at the top of the rotary kiln (5) and close to the left side of the rotary kiln (5); the discharge port (12) is arranged at the bottom of the rotary kiln (5) and close to the right side of the rotary kiln (5); and the axial directions of the feed port (11) and the discharge port (12) are parallel to the central axis of the rotary kiln (5); A plurality of exhaust devices (2) are arranged on a side of the conveying and heat collecting device (1) away from the rotary kiln (5), and are configured to discharge water vapor generated during the drying process of the material and to discharge the waste gas after treatment.

2. The unpowered drying system for utilizing waste heat from a rotary kiln according to claim 1, characterized in that: The angle between the central axis of the rotary kiln (5) and the horizontal plane is 3-4°.

3. The unpowered drying system for utilizing waste heat from a rotary kiln according to claim 1, characterized in that: Also includes a fixing device (4); The fixing device (4) is arranged between the transporting and heat collecting device (1) and the rotary kiln (5).

4. The unpowered drying system for utilizing waste heat from a rotary kiln according to claim 1, characterized in that: Also includes a filter (3); A filter screen (3) is arranged inside the exhaust device (2).

5. The unpowered drying system for utilizing waste heat from a rotary kiln according to claim 4, characterized in that: The filter screen (3) is made of metal.

6. The unpowered drying system for utilizing waste heat from a rotary kiln according to claim 1, characterized in that: It also includes insulation; The heat-insulating layer is arranged on a side of the transporting and heat-collecting device (1) away from the rotary kiln (5).

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