External decomposition kiln staged combustion device

Abstract

The utility model relates to a staged combustion device for a decomposition kiln outside the kiln, which comprises a decomposition furnace arranged at a smoke chamber at the tail of the rotary kiln, a combustor is arranged on the decomposition furnace, five cyclone cylinders which are sequentially connected in series on a hot air duct for conveying hot smoke upwards are arranged on the decomposition furnace, air outlet pipes are respectively and fixedly communicated with the centers of the tops of the five cyclone cylinders, and the air outlet pipes are communicated with the combustor. A supporting rod is fixedly connected into the air outlet pipe, and the middle of the supporting rod is rotationally connected with a rotating seat. Hot smoke upwards enters the cyclones through the hot air ducts, materials can enter the corresponding cyclones and the hot air ducts along with ascending airflow, the materials are suspended and preheated under the action of the air speed, and then the materials are discharged from the discharging ports in the bottoms of the cyclones, so that the airflow upwards flows along the middles of the cyclones, and in the process that the materials move downwards, the materials are discharged from the discharging ports in the bottoms of the cyclones. The upward airflow can drive the fan blades to rotate so as to drive the round rod and the scattering rod to rotate, so that materials in the discharge hole in the bottom of the cyclone cylinder can be stirred and disturbed.

Description

Technical Field

[0001] The utility model relates to precalcining technology, in particular to a staged combustion device for a precalcining kiln. Background Art

[0002] The precalcining technology conducts the preheating of cement raw meal powder and the decomposition process of most calcium carbonate in a preheater and a decomposing furnace outside the kiln. Since the preheating of raw meal powder and the decomposition process of calcium carbonate are moved outside the rotary kiln, the length of the kiln is greatly shortened, the heat consumption is significantly reduced, and the output is greatly increased. Both the fuel and the raw meal powder exist in a suspended state, enabling combustion and heat exchange to occur simultaneously. Due to the relatively large contact surface between the gas and solid phases, combustion, heat exchange, and reaction in the decomposing furnace are all completed with high efficiency.

[0003] When the discharge port of the cyclone in the existing staged combustion device of the precalcining kiln discharges materials, there is a risk of blockage at the discharge port, which has certain limitations. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a staged combustion device for a precalcining kiln, which is used to solve the problem that there is a risk of blockage at the discharge port when the discharge port of the cyclone in the existing staged combustion device of the precalcining kiln discharges materials.

[0005] To solve the above problems, the utility model provides a staged combustion device for a precalcining kiln, which includes a decomposing furnace installed at the kiln tail smoke chamber of a rotary kiln. A burner is provided on the decomposing furnace. Five cyclones are sequentially connected in series on a hot air duct that conveys hot flue gas upward on the decomposing furnace. Air outlet pipes are fixedly connected to the centers of the tops of the five cyclones respectively. A support rod is fixedly connected inside the air outlet pipe. The middle part of the support rod is rotatably connected to a rotating base. A connecting rod is fixedly connected to the bottom of the rotating base. A plurality of fan blades arranged in an annular array are fixed to the side of the bottom of the connecting rod. A round rod is fixedly connected to the bottom of the connecting rod. The bottom of the round rod is inserted into the discharge ports at the bottoms of the five cyclones and a plurality of dispersing rods are fixed.

[0006] The staged combustion device for a precalcining kiln provided by the utility model further has the following technical features:

[0007] Further, the five cyclones are sequentially divided into a first cyclone, a second cyclone, a third cyclone, a fourth cyclone, and a fifth cyclone from top to bottom.

[0008] Further, the number of the hot air ducts is multiple, the shape of the hot air ducts is arc-shaped, the bottom end of the lowermost hot air duct is connected to the bottom of the decomposition furnace, the free end of the lowermost hot air duct is connected to one side of the fifth cyclone, the hot air duct at the top of the fifth cyclone is connected to one side of the fourth cyclone, the hot air duct at the top of the fourth cyclone is connected to one side of the third cyclone, the hot air duct at the top of the third cyclone is connected to one side of the second cyclone, and the hot air duct at the top of the second cyclone is connected to one side of the first cyclone.

[0009] Further, the discharge port at the bottom of the first cyclone is communicated with the hot air duct at the top of the third cyclone, the discharge port at the bottom of the second cyclone is communicated with the hot air duct at the top of the fourth cyclone, the discharge port at the bottom of the third cyclone is communicated with the hot air duct at the top of the fifth cyclone, the discharge port at the bottom of the fourth cyclone is communicated with the inside of the decomposition furnace, and the discharge port at the bottom of the fifth cyclone is communicated with the kiln tail of the rotary kiln.

[0010] Further, a cooler is installed at one end of the kiln head of the rotary kiln, and a tertiary air duct is provided at the kiln head of the rotary kiln, and the free end of the tertiary air duct is communicated with the decomposition furnace.

[0011] Further, a feed pipe is fixedly communicated with the hot air duct at the top of the second cyclone, and the top of the air outlet pipe is connected to the inner wall of the corresponding hot air duct through an open member.

[0012] The utility model has the following beneficial effects: When the device is in use, hot flue gas enters into multiple cyclones upward through multiple hot air ducts, and the material can enter the corresponding cyclones and hot air ducts along with the upward air flow. The material is also suspended and preheated under the action of the wind speed. Then the material is discharged from the discharge port at the bottom of the cyclone, so that the air flow flows upward along the middle part of the cyclone. During the process that the material moves downward, the upward air flow can drive the fan blades to rotate, and then drive the round rod and the dispersing rod to rotate, so as to stir and disturb the material in the discharge port at the bottom of the cyclone, thereby avoiding the blockage of the material in the discharge port at the bottom of the cyclone, and enabling the material to float in powder form, which is convenient for sufficient preheating. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of an embodiment of the utility model;

[0014] Figure 2 is a structural diagram of the first cyclone of an embodiment of the utility model;

[0015] Figure 3 is a sectional view of the first cyclone in an embodiment of the utility model;

[0016] Figure 4 is an embodiment of the utility model Figure 3 The enlarged structural schematic diagram at A in. Detailed Embodiment

[0017] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0018] As Figures 1 to 4 shown in the embodiment of the precalciner staged combustion device of the present utility model, the precalciner staged combustion device includes a decomposition furnace 2 installed at the kiln tail smoke chamber of the rotary kiln 1. A burner is provided on the decomposition furnace 2. Five cyclones are sequentially connected in series on a hot air duct 3 for upwardly conveying hot flue gas. At the centers of the tops of the five cyclones, air outlet pipes 5 are respectively fixedly connected. A support rod 6 is fixedly connected inside the air outlet pipe 5. The middle part of the support rod 6 is rotatably connected to a rotating base 7. The bottom of the rotating base 7 is fixedly connected to a connecting rod 8. A plurality of fan blades 9 arranged in an annular array are fixed on the side of the bottom of the connecting rod 8. The bottom end of the connecting rod 8 is fixedly provided with a round rod 10. The bottom of the round rod 10 is inserted into the discharge ports at the bottoms of the five cyclones and is fixedly provided with a plurality of dispersing rods 11. When the device is in use, hot flue gas enters the plurality of cyclones upward through the plurality of hot air ducts 3. The material can enter the corresponding cyclones and hot air ducts 3 along with the upward airflow. The material is also suspended and preheated under the action of the wind speed. Then the material is discharged from the discharge ports at the bottoms of the cyclones, enabling the airflow to flow upward in the middle of the cyclones. During the process of the material moving downward, the upward airflow can drive the fan blades 9 to rotate, thereby driving the round rod 10 and the dispersing rods 11 to rotate, so as to stir and disturb the material in the discharge ports at the bottoms of the cyclones, thus avoiding the blockage of the material in the discharge ports at the bottoms of the cyclones and enabling the material to float in a powder form, which is convenient for sufficient preheating.

[0019] In an embodiment of the present application, preferably, the five cyclones are sequentially divided into a first cyclone 41, a second cyclone 42, a third cyclone 43, a fourth cyclone 44, and a fifth cyclone 45 from top to bottom.

[0020] In an embodiment of the present application, preferably, the number of the hot air ducts 3 is multiple. The shape of the hot air ducts 3 is arc-shaped. The bottom end of the lowermost hot air duct 3 is connected to the bottom of the decomposition furnace 2. The free end of the lowermost hot air duct 3 is connected to one side of the fifth cyclone 45. The hot air duct 3 at the top of the fifth cyclone 45 is connected to one side of the fourth cyclone 44. The hot air duct 3 at the top of the fourth cyclone 44 is connected to one side of the third cyclone 43. The hot air duct 3 at the top of the third cyclone 43 is connected to one side of the second cyclone 42. The hot air duct 3 at the top of the second cyclone 42 is connected to one side of the first cyclone 41. The hot air duct 3 at the top of the first cyclone 41 can be connected to an external exhaust duct.

[0021] In one embodiment of the present application, preferably, the discharge port at the bottom of the first cyclone 41 is communicated with the hot air duct 3 at the top of the third cyclone 43, the discharge port at the bottom of the second cyclone 42 is communicated with the hot air duct 3 at the top of the fourth cyclone 44, the discharge port at the bottom of the third cyclone 43 is communicated with the hot air duct 3 at the top of the fifth cyclone 45, the discharge port at the bottom of the fourth cyclone 44 is communicated with the inside of the decomposition furnace 2, and the discharge port at the bottom of the fifth cyclone 45 is communicated with the kiln tail of the rotary kiln 1.

[0022] In one embodiment of the present application, preferably, a cooler 12 is installed at one end of the rotary kiln head. A tertiary air duct 13 is provided at the rotary kiln head of the rotary kiln 1. The free end of the tertiary air duct 13 is communicated with the decomposition furnace 2, and the tertiary air duct 13 sends the high-temperature hot air generated by cooling the finished product at the rotary kiln head of the rotary kiln 1 to the decomposition furnace 2 for combustion support and utilization.

[0023] In one embodiment of the present application, preferably, a feed pipe 14 is fixedly communicated with the hot air duct 3 at the top of the second cyclone 42. The top of the air outlet pipe 5 is connected to the inner wall of the corresponding hot air duct 3 through an open member, so that the rising hot flue gas flow can enter the corresponding hot air duct 3 through the air outlet pipe 5.

[0024] When the present utility model is in use, the powdered raw meal is put into the hot air duct 3 at the top of the second cyclone 42 through the feed pipe 14. The tertiary air duct 13 sends the high-temperature hot air generated by cooling the finished product at the rotary kiln head of the rotary kiln 1 to the decomposition furnace 2 for combustion support and utilization, and the hot flue gas generated by the tertiary air duct 13 is conveyed upward. After the powdered raw meal is suspended and preheated in the hot air duct 3 at the top of the second cyclone 42, the powdered raw meal enters the first cyclone 41 for suspended preheating and cyclone separation and collection. After the powdered raw meal is discharged from the discharge port at the bottom of the first cyclone 41 and suspended and preheated in the hot air duct 3 at the top of the third cyclone 43, the powdered raw meal enters the second cyclone 42 for suspended preheating and cyclone separation and collection. After the powdered raw meal is discharged from the discharge port at the bottom of the second cyclone 42 and suspended and preheated in the hot air duct 3 at the top of the fourth cyclone 44, the powdered raw meal enters the third cyclone 43 for suspended preheating and cyclone separation and collection. After the powdered raw meal is discharged from the discharge port at the bottom of the third cyclone 43 and suspended and preheated in the hot air duct 3 at the top of the fifth cyclone 45, the powdered raw meal enters the fourth cyclone 44 for suspended preheating and cyclone separation and collection. At this time, the raw meal has been partially decomposed. The powdered raw meal is discharged from the discharge port at the bottom of the second cyclone 42 into the decomposition furnace 2 for calcination and decomposition. The material is rapidly calcined and decomposed in a suspended state in the decomposition furnace 2. The material is then carried by the hot flue gas flow into the hot air duct 3 at the top of the decomposition furnace 2 and then enters the fifth cyclone 45. After the material is cyclone-separated and collected by the fifth cyclone 45, it enters the rotary kiln 1. At this time, the material entering the rotary kiln 1 is in a fluid state. The material is then rotated and tumbled in the rotary kiln, and the temperature in the kiln is controlled for calcination. After a small amount of fuel is burned, the material is completely decomposed, and finally it is cooled to room temperature by a cooler and then stored in a warehouse.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An off-kiln decomposition kiln graded combustion device, comprising a decomposition furnace (2) installed at the kiln tail smoke chamber of a rotary kiln (1), the decomposition furnace (2) being provided with a burner, characterized in that: The decomposition furnace (2) is provided with five cyclones which are sequentially connected in series on a hot air duct (3) for conveying hot flue gas upwards. The centers of the tops of the five cyclones are respectively fixedly connected with air outlet pipes (5). A support rod (6) is fixedly connected inside the air outlet pipe (5). The middle of the support rod (6) is rotatably connected with a rotating seat (7). The bottom of the rotating seat (7) is fixedly connected with a connecting rod (8). A plurality of fan blades (9) arranged in a circular array are fixedly connected to the side surface of the bottom of the connecting rod (8). A round rod (10) is fixedly connected to the bottom end of the connecting rod (8). The bottom of the round rod (10) is inserted into the discharge port at the bottom of the five cyclones and is fixed with a plurality of breaking rods (11).

2. The staged combustion device for decomposing kiln outside the kiln according to claim 1 is characterized in that: The five cyclone barrels are divided into a first cyclone barrel (41), a second cyclone barrel (42), a third cyclone barrel (43), a fourth cyclone barrel (44) and a fifth cyclone barrel (45) from top to bottom.

3. The staged combustion device for decomposing kiln outside the kiln according to claim 2 is characterized in that: The number of the hot air ducts (3) is plural, and the shape of the hot air ducts (3) is arc-shaped. The bottom end of the lowest hot air duct (3) is connected to the bottom of the decomposition furnace (2), and the free end of the lowest hot air duct (3) is connected to one side of the fifth cyclone barrel (45). The hot air duct (3) at the top of the fifth cyclone barrel (45) is connected to one side of the fourth cyclone barrel (44). The hot air duct (3) at the top of the fourth cyclone barrel (44) is connected to one side of the third cyclone barrel (43). The hot air duct (3) at the top of the third cyclone barrel (43) is connected to one side of the second cyclone barrel (42), and the hot air duct (3) at the top of the second cyclone barrel (42) is connected to one side of the first cyclone barrel (41).

4. The off-kiln decomposition kiln graded combustion device according to claim 3, characterized in that: The discharge port at the bottom of the first cyclone (41) is in communication with the hot air duct (3) at the top of the third cyclone (43); the discharge port at the bottom of the second cyclone (42) is in communication with the hot air duct (3) at the top of the fourth cyclone (44); the discharge port at the bottom of the third cyclone (43) is in communication with the hot air duct (3) at the top of the fifth cyclone (45); the discharge port at the bottom of the fourth cyclone (44) is in communication with the interior of the decomposition furnace (2); and the discharge port at the bottom of the fifth cyclone (45) is in communication with the kiln tail of the rotary kiln (1).

5. The off-kiln decomposition kiln graded combustion device according to claim 4, characterized in that: A cooler (12) is installed at one end of the kiln head of the rotary kiln (1). A tertiary air duct (13) is provided at the kiln head of the rotary kiln (1). The free end of the tertiary air duct (13) is connected to the decomposition furnace (2).

6. The staged combustion device for decomposing kiln outside the kiln according to claim 4 is characterized in that: A feed pipe (14) is fixedly connected to the hot air duct (3) at the top of the second cyclone (42), and the top of the air outlet pipe (5) is connected to the inner wall of the corresponding hot air duct (3) via an open part.

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