Cement raw material preheating device

Abstract

The utility model discloses a cement raw material preheating device, which comprises a preheater, a rotary kiln and a heating cylinder, the tail part of the rotary kiln is provided with a hot air main pipe, the left end and the right end of the preheater are respectively provided with a hot air branch pipe, the two groups of hot air branch pipes are communicated with the hot air main pipe through a three-way pipe, and the hot air main pipe is also provided with a filter. According to the cement raw material preheating device, the heating cylinder with the stable compensation function is arranged on the periphery of the preheater, the temperature in the preheater can be adjusted through the heating cylinder, and therefore the temperature in the preheater can be stabilized, and it is guaranteed that the preheating effect is not affected; furthermore, by arranging a convection type hot air system, the raw materials can be evenly heated, further, by arranging a filtering system, impurities such as dust in hot waste gas can be removed, and therefore the situation that the quality of the raw materials is reduced due to the fact that the raw materials are polluted by the impurities is prevented.

Description

Technical Field

[0001] This utility model relates to the field of cement production technology, specifically to a cement raw material preheating device. Background Technology

[0002] Cement production mainly consists of processes such as crushing and pre-homogenization, raw meal preparation and homogenization, preheating and decomposition, cement clinker firing, cement grinding and packaging.

[0003] Existing preheating devices primarily rely on waste heat from the kiln tail of rotary kilns as their heat source. This aims to improve the utilization rate of thermal energy. However, in actual applications, the unstable temperature of the waste gas at the kiln tail directly affects the preheating effect, thus compromising preheating efficiency. Furthermore, the waste gas carries a large amount of dust and other pollutants, which directly contact the raw materials, affecting their quality.

[0004] To address these issues, our company developed this preheating device. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a cement raw material preheating device, which solves the problem of low efficiency in existing cement raw material preheating devices.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a cement raw material preheating device, including a preheater, a rotary kiln and a heating cylinder, a hot air main pipe installed at the tail of the rotary kiln, hot air branch pipes installed at both ends of the preheater, and the two sets of hot air branch pipes connected to the hot air main pipe through a T-connector, wherein a filter is also provided on the hot air main pipe.

[0009] The top and bottom of the preheater are respectively equipped with a feed hopper and a discharge pipe, and the end of the discharge pipe is connected to the inlet of the rotary kiln.

[0010] The preheater has a rotatable stirring shaft installed in its inner cavity. The stirring shaft is hollow and has exhaust holes on its surface. One end of the stirring shaft extends to the outside of the preheater and is equipped with a rotary joint. One side of the rotary joint is connected to one of the hot air branch pipes.

[0011] A first motor is installed below the preheater, and the output end of the first motor is connected to the stirring shaft through a drive wheel and belt.

[0012] The heating cylinder has a water inlet and a drain outlet at the top and bottom, respectively, and an electric heating element is installed inside the heating cylinder.

[0013] As a further preferred embodiment, the preheater is equipped with a thermometer.

[0014] As a further preferred embodiment, the filter includes a housing, a sleeve inside the housing, a spring inside the sleeve, a filter screen assembly installed between the springs, a waste discharge box at the bottom of the housing, a second motor at the top of the housing, and an eccentric wheel installed at the output end of the second motor.

[0015] As a further preferred embodiment, the filter assembly includes multiple filter plates, with the pore size of the filter plates increasing sequentially from left to right.

[0016] (III) Beneficial Effects

[0017] This utility model provides a cement raw material preheating device. It has the following beneficial effects:

[0018] This cement raw material preheating device features a heating cylinder with a stabilizing compensation function around the preheater. This heating cylinder regulates the temperature inside the preheater, ensuring a stable internal temperature and maintaining the preheating effect. Furthermore, a convection hot air system ensures uniform heating of the raw material. Moreover, a filtration system removes dust and other impurities from the exhaust gas, preventing contamination of the raw material and thus reducing its quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a partial structural cross-sectional view of the present invention;

[0021] Figure 3 This is a cross-sectional view of the filter structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the filter screen structure of this utility model.

[0023] In the diagram: 1. Preheater; 2. Rotary kiln; 3. Heating cylinder; 31. Water inlet; 32. Drain outlet; 4. Hot air main pipe; 5. T-pipe; 6. Hot air branch pipe; 7. Filter; 71. Shell; 72. Filter screen assembly; 721. Filter screen plate; 73. Sleeve; 74. Spring; 75. Second motor; 76. Eccentric wheel; 77. Waste discharge box; 8. Feed hopper; 9. First motor; 10. Belt; 11. Drive wheel; 12. Stirring shaft; 121. Exhaust port; 13. Rotary joint; 14. Electric heating element; 15. Discharge pipe; 16. Thermometer. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1 As shown, this utility model provides a technical solution: a cement raw material preheating device, including a preheater 1, a rotary kiln 2 and a heating cylinder 3. A hot air main pipe 4 is installed at the tail end of the rotary kiln 2. Hot air branch pipes 6 are installed at both ends of the preheater 1. The two sets of hot air branch pipes 6 are connected to the hot air main pipe 4 through a three-way pipe 5. A filter 7 is also provided on the hot air main pipe 4.

[0026] like Figure 3-4 As shown, the filter 7 includes a housing 71, inside which is a sleeve 73, and inside the sleeve 73 is a spring 74. The purpose of the spring 74 is to allow the filter screen assembly 72 to be reset in time. The filter screen assembly 72 is installed between the springs 74. A waste discharge box 77 is provided at the bottom of the housing 71, and a second motor 75 is provided at the top of the housing 71. An eccentric wheel 76 is installed at the output end of the second motor 75. The filter screen assembly 72 includes multiple filter screen plates 721, and the aperture of the filter screen plates 721 increases sequentially from left to right. By setting multiple sets of filter screen plates 721, the purpose of fully filtering impurities can be achieved.

[0027] like Figure 1 As shown, the top and bottom of the preheater 1 are respectively provided with a feed hopper 8 and a discharge pipe 15. The end of the discharge pipe 15 is connected to the inlet of the rotary kiln 2. The raw material after preheating enters the rotary kiln 2 through the discharge pipe 15 for calcination.

[0028] like Figure 1-2 As shown, a rotatable stirring shaft 12 is installed in the inner cavity of the preheater 1. The stirring shaft 12 is a hollow structure, and an exhaust hole 121 is opened on the surface of the stirring shaft 12. One end of the stirring shaft 12 extends to the outside of the preheater 1 and is equipped with a rotary joint 13. One side of the rotary joint 13 is connected to one of the hot air branch pipes 6. The purpose of setting the rotary joint 13 is to prevent the hot air branch pipe 6 from rotating with the stirring shaft 12. At the same time, the waste heat and exhaust gas can enter the interior of the stirring shaft 12 through the rotary joint 13.

[0029] like Figure 1 As shown, a first motor 9 is installed below the preheater 1. The output end of the first motor 9 is connected to the stirring shaft 12 via a transmission wheel 11 and a belt 10.

[0030] like Figure 1As shown, the top and bottom of the heating cylinder 3 are respectively provided with a water inlet 31 and a drain outlet 32. The heating cylinder 3 is equipped with an electric heating tube 14 (the electric heating tube 14 can perform thermal compensation). The preheater 1 is equipped with a thermometer 16, which can be used to check the temperature inside the preheater 1 so that it can be adjusted at any time.

[0031] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0032] During use, raw materials enter the preheater 1 through the feed hopper 8. The waste heat and exhaust gas in the rotary kiln 2 enter the preheater 1 through the hot air main pipe 4, the three-way pipe 5, and the hot air branch pipe 6, and finally enter the preheater 1 from the two ports of the preheater 1.

[0033] Prior to this, the exhaust gas is filtered through filter 7. After the exhaust gas enters the housing 71, it is filtered and absorbed by multiple sets of filter screens 721 arranged longitudinally, which absorb dust and other impurities in the exhaust gas before being discharged. By turning on the second motor 75, the eccentric wheel 76 is driven to rotate. Every time the eccentric wheel 76 rotates, it strikes the filter screen group 72 once through its long shaft end. The vibration generated by the impact can shake off the impurities on the filter screen 721. The impurities enter the waste discharge box 77 from the bottom of the housing 71 for temporary storage.

[0034] After impurity removal, the exhaust gas enters the preheater 1 directly from the right port of the preheater 1 at one end, and enters the stirring shaft 12 through the rotary joint 13 at the other end, and is discharged through the exhaust port 121. The first motor 9 is turned on, and the stirring shaft 12 can be driven to rotate through the transmission wheel 11 and belt 10, so that the raw material can fully contact the waste heat exhaust gas during the stirring process and heat the raw material.

[0035] Furthermore, hot water enters the heating cylinder 3 through the inlet 31, thereby providing thermal compensation for the preheater 1. Conversely, when the temperature inside the preheater 1 is too high, cold water is introduced through the inlet 31 to absorb the excess heat inside the preheater 1 and achieve the purpose of temperature regulation. The hot water after absorbing heat is discharged through the drain 32 and used for other purposes. This measure can achieve the purpose of controlling the stability of the internal temperature of the preheater 1.

[0036] In summary, this cement raw material preheating device, by setting a heating cylinder with a stabilizing compensation function around the preheater, can regulate the internal temperature of the preheater, thereby stabilizing the internal temperature and ensuring that the preheating effect is not affected. Furthermore, by setting up a convection hot air system, the raw material can be heated evenly. Moreover, by setting up a filtration system, dust and other impurities in the hot exhaust gas can be removed, thereby preventing impurities from contaminating the raw material and causing a decline in raw material quality.

[0037] It should be noted that all electrical components mentioned in this article are electrically connected to an external main controller and 220V or 380V AC mains power. The main controller can be a conventional, known device such as a computer, and its control principles, internal structure, and control switching methods are all conventional methods of existing technology. These are directly cited here without further elaboration. In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cement raw material preheating device, characterized in that: It includes a preheater (1), a rotary kiln (2) and a heating cylinder (3). A hot air main pipe (4) is installed at the tail of the rotary kiln (2). Hot air branch pipes (6) are installed at both ends of the preheater (1). The two sets of hot air branch pipes (6) are connected to the hot air main pipe (4) through a three-way pipe (5). A filter (7) is also installed on the hot air main pipe (4). The top and bottom of the preheater (1) are respectively provided with a feed hopper (8) and a discharge pipe (15), and the end of the discharge pipe (15) is connected to the inlet of the rotary kiln (2). The inner cavity of the preheater (1) is equipped with a rotatable stirring shaft (12). The stirring shaft (12) is hollow and has an exhaust hole (121) on its surface. One end of the stirring shaft (12) extends to the outside of the preheater (1) and is equipped with a rotary joint (13). One side of the rotary joint (13) is connected to one of the hot air branch pipes (6). A first motor (9) is installed below the preheater (1). The output end of the first motor (9) is connected to the stirring shaft (12) via a transmission wheel (11) and a belt (10). The top and bottom of the heating cylinder (3) are respectively provided with a water inlet (31) and a drain outlet (32), and an electric heating tube (14) is provided inside the heating cylinder (3).

2. The cement raw material preheating device according to claim 1, characterized in that: The preheater (1) is equipped with a thermometer (16).

3. The cement raw material preheating device according to claim 1, characterized in that: The filter (7) includes a housing (71), a sleeve (73) is provided inside the housing (71), a spring (74) is provided inside the sleeve (73), a filter screen assembly (72) is installed between the springs (74), a waste discharge box (77) is provided at the bottom of the housing (71), a second motor (75) is provided at the top of the housing (71), and an eccentric wheel (76) is installed at the output end of the second motor (75).

4. A cement raw material preheating device according to claim 3, characterized in that: The filter assembly (72) includes multiple filter plates (721), and the aperture of the filter plates (721) increases sequentially from left to right.

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