Horizontal rotary heating device for detecting limestone thermal burst pulverization rate

Abstract

The invention provides a horizontal rotary heating device for detecting the thermal burst pulverization rate of limestone. The horizontal rotary heating device comprises a fixed kiln cylinder device, an in-kiln rotary device, an outer kiln cylinder fixed circular sleeve and a device base, the device base comprises a bottom plate I and a side plate I, and a guide rail is arranged on the bottom plate I; the kiln cylinder fixing device is fixedly mounted on the side plate I, and the other end of the kiln cylinder fixing device is open; a movable tray and a movable trolley are mounted on the guide rail; the movable trolley is provided with a bottom plate II and a side plate II, the side plate II is provided with a sealing large bearing, and the other side plate II is provided with an external kiln fixed bearing; the in-kiln rotating device comprises a rotating cylinder, one end of the rotating cylinder is sealed through a circular plate, and a connecting shaft is installed on the circular plate. The circular plate is rotatably installed on the sealing large bearing, and the connecting shaft is rotatably installed on the external kiln fixing bearing. According to the invention, the bursting pulverization characteristics of the limestone with different characteristics can be tested in advance, so that the thermal bursting pulverization performance of the limestone can be accurately evaluated.

Description

Technical Field

[0001] This invention relates to the field of limestone thermal property testing technology, and more particularly to a horizontal rotary heating device for testing the thermal cracking and pulverization rate of limestone. Background Technology

[0002] Quicklime, as an important auxiliary raw material in the metallurgical industry, is widely used in steelmaking, sintering, pelletizing, desulfurization, and other processes. The performance requirements for quicklime vary depending on the application. With the rapid progress of the metallurgical industry, the mining and consumption of high-quality natural limestone are increasing year by year. Therefore, the development and use of low-grade limestone has become urgent. Low-grade limestone resources are rich in magnesium, and dolomite minerals are commonly found associated with limestone. Dolomite minerals are prevalent at the cleavage sites of limestone minerals. Due to the thermal mismatch effect between mineral phases, they are prone to explosive pulverization, affecting the normal production of quicklime in rotary kilns.

[0003] To address these issues, researchers and quicklime producers have devoted considerable effort to simulating and testing the thermal decomposition and pulverization behavior of low-grade limestone under laboratory conditions. One method involves heating the mineral to a certain temperature using a muffle furnace, cooling it, and then subjecting the cooled material to forced mechanical impact through a rotary drum device. Finally, the material is separated into lumps and powder, and the decomposition and pulverization index is calculated. However, this method is limited by the thermomechanical properties of the rotary drum device and cannot accurately reflect the mechanical impact of hot material. Furthermore, heating lumpy limestone in a muffle furnace does not truly reflect the pulverization behavior caused by thermomechanical impact between lumps during quicklime production in a rotary kiln. Therefore, the decomposition and pulverization rate of easily decomposable limestone tested using traditional heating devices is far lower than the actual measured values. Currently, there is a lack of specialized thermal performance testing equipment for low-grade easily decomposable limestone, making it difficult to accurately evaluate its decomposition and pulverization performance. Summary of the Invention

[0004] In order to test the bursting and pulverization characteristics of limestone with different origins, grades and diagenetic properties in advance, and to accurately evaluate the thermal bursting performance of limestone, this invention provides a horizontal rotary heating device for detecting the thermal bursting and pulverization rate of limestone.

[0005] The technical means employed in this invention are as follows: A horizontal rotary heating device for detecting the thermal explosion and pulverization rate of limestone includes a fixed kiln cylinder device, an internal kiln rotary device, an external kiln cylinder fixing sleeve, and a device base. The device base includes a base plate I and a side plate I located at one end of the base plate I, and a guide rail is provided on the base plate I along the length direction; The fixed kiln cylinder device is fixedly installed on the side plate I, with an opening at the other end; a temperature measuring device, an exhaust device, and a heating device that extend into the fixed kiln cylinder device are also installed on the side plate I; an inspection and observation window is provided on the top of the fixed kiln cylinder device; The guide rail is equipped with a movable material tray and a movable trolley, both of which are equipped with movable wheels. The movable material tray is located on the side of the movable trolley facing the fixed kiln cylinder device. The movable trolley is provided with a horizontal base plate II and vertical side plates II opposite to each other on both sides of the base plate II. A sealed large bearing is installed on the side plate II near the fixed kiln cylinder device, and an external fixed bearing coaxial with the sealed large bearing is installed on the other side plate II. The kiln-in-rotation device includes a rotary drum made of a screen, one end of which is closed by a circular plate. A connecting shaft is installed on the outer end face of the circular plate. The circular plate is rotatably mounted on a sealed large bearing, and the connecting shaft passes through the sealed large bearing and is rotatably mounted on an external fixed bearing. An annular outer kiln cylinder fixing sleeve is fixedly installed on the side plate II on which the sealed large bearing is installed, facing the fixed kiln cylinder device. The outer kiln cylinder fixing sleeve is located outside the rotary drum. A variable frequency motor is fixedly mounted on the bottom plate II, and its output shaft is connected to the connecting shaft via a transmission belt. The variable frequency motor drives the transmission belt to rotate the kiln-in-rotation device. The movable material tray is located below the rotary drum. The movable trolley is used to extend the rotary drum into the fixed kiln device. After the rotary drum is extended into the fixed kiln device, the temperature measuring device and the exhaust device are located between the rotary drum and the fixed kiln device, and the heating device is located inside the rotary drum.

[0006] Furthermore, the fixed kiln cylinder device, the heating device, the kiln internal rotation device, the outer kiln cylinder fixing sleeve, and the sealing large bearing are coaxial.

[0007] Furthermore, the diameter of the rotary drum is smaller than the diameter of the fixed outer kiln cylinder, and the length of the rotary drum is the same as the length of the fixed outer kiln cylinder.

[0008] Furthermore, the inspection window is connected to the fixed kiln cylinder device by bolts, and is used to observe the limestone mineral loading and the operation of the temperature measuring device and the exhaust device under cold conditions. The inspection window is not allowed to be opened under hot conditions.

[0009] Furthermore, the movable tray is fixedly connected to the side plate on which the sealed large bearing is installed.

[0010] Compared with the prior art, the present invention has the following advantages: The horizontal rotary heating device for detecting the thermal explosion and pulverization rate of limestone provided by this invention can be used to test the explosion and pulverization characteristics of limestone with different properties in advance, so as to accurately evaluate the thermal explosion and pulverization performance of limestone and guide enterprises to select different kiln types to produce qualified products efficiently. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is one of the structural schematic diagrams of the horizontal rotary heating device for detecting the thermal explosion pulverization rate of limestone according to the present invention.

[0013] Figure 2 This is the second schematic diagram of the horizontal rotary heating device for detecting the thermal cracking and pulverization rate of limestone according to the present invention.

[0014] Figure 3 This is a cross-sectional view of the horizontal rotary heating device for detecting the thermal cracking and pulverization rate of limestone according to the present invention.

[0015] In the diagram: 1. Inspection and observation window; 2. Fixed kiln cylinder device; 3. Temperature measuring device; 4. Exhaust device; 5. Heating device; 6. Inner kiln rotation device; 7. Outer kiln cylinder fixing sleeve; 8. Variable frequency motor driving the inner kiln rotation device; 9. Transmission belt; 10. Movable material tray; 11. Device base; 12. Sealed large bearing; 13. Outer kiln fixed bearing. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0020] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0021] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0022] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0023] Example 1 like Figure 1-3 As shown, the present invention provides a horizontal rotary heating device for detecting the thermal explosion pulverization rate of limestone, including a fixed kiln cylinder device 2, an internal kiln rotary device 6, an external kiln cylinder fixing sleeve 7, and a device base 11. The device base 11 includes a base plate I and a side plate I located at one end of the base plate I, and a guide rail is provided on the base plate I along the length direction; The fixed kiln cylinder device 2 is fixedly installed on the side plate I, with an opening at the other end; a temperature measuring device 3, an exhaust device 4, and a heating device 5 that extend into the fixed kiln cylinder device 2 are also installed on the side plate I; an inspection and observation window 1 is provided on the top of the fixed kiln cylinder device 2; The guide rail is equipped with a movable material tray 10 and a movable trolley, both of which are equipped with movable wheels. The movable material tray 10 is located on the side of the movable trolley facing the fixed kiln device 2. The movable trolley is provided with a horizontal base plate II and vertical side plates II opposite to each other on both sides of the base plate II. A sealed large bearing 12 is installed on the side plate II close to the fixed kiln device 2, and an external fixed bearing 13 coaxial with the sealed large bearing 12 is installed on the other side plate II. The kiln-in-rotation device 6 includes a rotary drum made of a screen. One end of the rotary drum is closed by a circular plate, and a connecting shaft is installed on the outer end face of the circular plate. The circular plate is rotatably mounted on a large sealed bearing 12, and the connecting shaft passes through the large sealed bearing 12 and is rotatably mounted on an external fixed bearing 13. An annular outer kiln cylinder fixing sleeve 7 is fixedly installed on the side plate II on which the large sealed bearing 12 is installed, facing the fixed kiln cylinder device 2. The outer kiln cylinder fixing sleeve 7 is located outside the rotary drum and is used to form a seal between the rotary drum and the inner wall of the fixed kiln cylinder device 2 when the rotary drum extends into the fixed kiln cylinder device 2. A variable frequency motor 8 is fixedly mounted on the bottom plate II, and its output shaft is connected to the connecting shaft through a transmission belt 9. The variable frequency motor 8 is used to drive the transmission belt 9 to drive the kiln-in-rotation device 6 to rotate. The movable material tray 10 is located below the rotary drum and is used to receive materials. The movable trolley is used to extend the rotary drum into the fixed kiln drum device 2. After the rotary drum is extended into the fixed kiln drum device 2, the temperature measuring device 3 and the exhaust device 4 are located between the rotary drum and the fixed kiln drum device 2, and the heating device 5 is located inside the rotary drum.

[0024] Furthermore, the fixed kiln cylinder device 2, the heating device 5, the kiln internal rotation device 6, the outer kiln cylinder fixing sleeve 7, and the sealing large bearing 12 are coaxial.

[0025] Furthermore, the fixed outer kiln cylinder 2 is a cylindrical cylinder, and the outer diameter of the outer kiln cylinder fixing sleeve 7 is equal to the inner diameter of the fixed outer kiln cylinder 2.

[0026] Furthermore, the diameter of the rotary drum is smaller than the diameter of the fixed outer kiln cylinder 2, and the length of the rotary drum is the same as the length of the fixed outer kiln cylinder 2.

[0027] Furthermore, the inspection and observation window 1 is connected to the fixed kiln cylinder device 2 by bolts, and is used to observe the limestone mineral loading situation and the operation of the temperature measuring device 4 and the exhaust device 3 under cold conditions. The inspection and observation window 1 is not allowed to be opened under hot conditions.

[0028] Furthermore, the movable tray 10 is fixedly connected to the side plate II on which the sealed large bearing 12 is installed.

[0029] The working process of the horizontal rotary heating device for detecting the thermal bursting and pulverization rate of limestone provided by this invention is as follows: During testing, a certain amount of blocky limestone minerals to be heated are received by the kiln-in-rotation device 6. Then, the inspection and observation window 1 is opened, and the movable trolley is moved along the guide rail toward the fixed kiln cylinder device 2 until the end face of the screen cylinder of the kiln-in-rotation device 6 is in contact with the vertical inner wall of the fixed outer kiln cylinder 2. The inner wall of the fixed kiln cylinder device 2 facing the movable trolley can be in contact with the outer wall of the fixed round sleeve 7 of the outer kiln cylinder. After the two form a seal, the moving wheels on the movable trolley are locked.

[0030] The limestone minerals are heated by burners and combustion air on the heating device 5. The variable frequency motor 8 drives the belt 9, which in turn drives the external rotary device 6 to rotate. The limestone on the screen cylinder is heated by the heating device 5 and its surface bursts and decomposes. The bursting and pulverized material falls into the fixed kiln cylinder device 2 through the screen holes under the action of gravity. The lumpy material that has not burst and pulverized remains inside the screen cylinder. The heating device 5 continuously heats and keeps the limestone minerals at a constant temperature by the temperature measuring device 4. The exhaust device 3 discharges the gas formed by the combustion of fuel gas and the decomposition of minerals in the kiln, ensuring that the pressure inside the kiln is balanced with the air pressure outside the kiln.

[0031] After heating is completed, open the movable wheel lock on the movable trolley, take out the powdery material collected inside the fixed kiln cylinder device 2 and the non-exploded pulverized material in the screen cylinder, weigh them separately and calculate the limestone explosion pulverization index.

[0032] The device described in this invention can test the bursting and pulverization characteristics of limestone with different properties in advance, so as to accurately evaluate the thermal bursting and pulverization performance of limestone and guide enterprises to select different kiln types to produce qualified products efficiently.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A horizontal rotary heating device for detecting the thermal cracking and pulverization rate of limestone, characterized in that, Includes a fixed kiln cylinder device, an internal kiln rotation device, an external kiln cylinder fixing sleeve, and a device base; The device base includes a base plate I and a side plate I located at one end of the base plate I, and a guide rail is provided on the base plate I along the length direction; The fixed kiln cylinder device is fixedly installed on the side plate I, with an opening at the other end; a temperature measuring device, an exhaust device, and a heating device that extend into the fixed kiln cylinder device are also installed on the side plate I; an inspection and observation window is provided on the top of the fixed kiln cylinder device; The guide rail is equipped with a movable material tray and a movable trolley, both of which are equipped with movable wheels. The movable material tray is located on the side of the movable trolley facing the fixed kiln cylinder device. The movable trolley is provided with a horizontal base plate II and vertical side plates II opposite to each other on both sides of the base plate II. A sealed large bearing is installed on the side plate II near the fixed kiln cylinder device, and an external fixed bearing coaxial with the sealed large bearing is installed on the other side plate II. The kiln-in-rotation device includes a rotary drum made of a screen, one end of which is closed by a circular plate. A connecting shaft is installed on the outer end face of the circular plate. The circular plate is rotatably mounted on a sealed large bearing, and the connecting shaft passes through the sealed large bearing and is rotatably mounted on an external fixed bearing. An annular outer kiln cylinder fixing sleeve is fixedly installed on the side plate II on which the sealed large bearing is installed, facing the fixed kiln cylinder device. The outer kiln cylinder fixing sleeve is located outside the rotary drum. A variable frequency motor is fixedly mounted on the bottom plate II, and its output shaft is connected to the connecting shaft via a transmission belt. The variable frequency motor drives the transmission belt to rotate the kiln-in-rotation device. The movable material tray is located below the rotary drum. The movable trolley is used to extend the rotary drum into the fixed kiln device. After the rotary drum is extended into the fixed kiln device, the temperature measuring device and the exhaust device are located between the rotary drum and the fixed kiln device, and the heating device is located inside the rotary drum.

2. The horizontal rotary heating device for detecting the thermal bursting and pulverization rate of limestone according to claim 1, characterized in that, The fixed kiln cylinder device, the heating device, the kiln internal rotation device, the outer kiln cylinder fixing sleeve, and the sealing large bearing are coaxial.

3. The horizontal rotary heating device for detecting the thermal bursting and pulverization rate of limestone according to claim 1, characterized in that, The diameter of the rotary drum is smaller than the diameter of the fixed outer kiln cylinder, and the length of the rotary drum is the same as the length of the fixed outer kiln cylinder.

4. The horizontal rotary heating device for detecting the thermal bursting and pulverization rate of limestone according to claim 1, characterized in that, The inspection window is connected to the fixed kiln cylinder device by bolts. It is used to observe the limestone mineral loading and the operation of the temperature measuring device and the exhaust device under cold conditions. The inspection window is not allowed to be opened under hot conditions.

5. The horizontal rotary heating device for detecting the thermal bursting and pulverization rate of limestone according to claim 1, characterized in that, The movable tray is fixedly connected to the side plate on which the sealed large bearing is installed.

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