Waste heat recovery device of rotary kiln

Abstract

The utility model relates to the technical field of rotary kilns, and discloses a rotary kiln waste heat recovery device which comprises a bottom plate, a rotary kiln body, a motor and a rotating mechanism, and the bottom plate and the rotary kiln body are connected through the rotating mechanism and an auxiliary rotating mechanism. An air outlet hole is formed in the inner side wall of the rotary kiln body, a filter screen is installed on the inner surface of the air outlet hole, a heat preservation pipe is wound around the outer surface of the rotary kiln body, and a containing cavity in the left end of the heat preservation pipe communicates with the air outlet hole. Valves II are mounted on the outer surfaces of the ends, away from the air outlets, of the insulating pipes; a cleaning mechanism is mounted on the outer surface of the left end of the rotary kiln body; through cooperation of the structure, the recycling rate of waste heat in waste gas can be increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotary kilns, in particular to a waste heat recovery device of a rotary kiln. Background Art

[0002] The rotary kiln can calcine active lime and other materials and is widely used in cement, metallurgy and other industries. The rotary kiln usually has a cylindrical kiln body.

[0003] During the working process, the combustion-supporting gas continuously enters the kiln body from the kiln head to provide oxygen for the combustion of the materials. After calcination, the clinker is discharged from the kiln head, and the combustion-supporting gas is converted into high-temperature exhaust gas after combustion and discharged from the kiln tail. During the calcination of materials by the rotary kiln, a large amount of radiant heat will be emitted to the outside from the kiln head, and high-temperature exhaust gas will also be emitted to the outside from the kiln tail, which not only aggravates the greenhouse effect, but also causes a waste of thermal energy resources, and the utilization rate of thermal energy in the exhaust gas is low.

[0004] For this reason, we propose a waste heat recovery device for a rotary kiln. Utility Model Content

[0005] The utility model aims to provide a waste heat recovery device for a rotary kiln in order to improve the recovery rate of waste heat in exhaust gas.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A waste heat recovery device for a rotary kiln, comprising a bottom plate, a rotary kiln body, a motor and a rotating mechanism, wherein the bottom plate and the rotary kiln body are connected via the rotating mechanism and the auxiliary rotating mechanism;

[0008] An air outlet is provided on the inner side wall of the rotary kiln body, a filter screen is installed on the inner surface of the air outlet, an insulation pipe is wound around the outer surface of the rotary kiln body, the inner cavity of the left end of the insulation pipe is connected with the air outlet, a valve 1 is installed on the outer surface of one end of the insulation pipe close to the air outlet, and a valve 2 is installed on the outer surface of one end of the insulation pipe away from the air outlet;

[0009] A cleaning mechanism is installed on the outer surface of the left end of the rotary kiln body, and the cleaning mechanism includes a water tank. A water inlet is arranged on the upper surface of the water tank. The water tank is fixedly connected to the outer surface of the left end of the rotary kiln body. A water pump is fixedly installed on the inner bottom surface of the water tank. The water inlet of the water pump is connected to the internal volume of the water tank. The water outlet of the water pump is connected to a water pipe. The end of the water pipe away from the water pump is connected to the internal volume of the left end of the insulation pipe.

[0010] In a preferred embodiment of the utility model, a kiln cover is installed on the outer side surface of the right end of the bottom plate, an air inlet pipe is installed on the outer surface of the kiln cover, and the inner cavity of the air inlet pipe is connected with the inner cavity of the rotary kiln body.

[0011] In a preferred utility model embodiment, the rotating mechanism is installed on the upper surfaces of both ends of the base plate, and the rotating mechanism includes two fixed blocks, the fixed blocks are fixedly connected to the upper surface of the base plate, the upper surfaces of the two fixed blocks are fixedly connected with fixed plates, a rotating rod is rotatably connected between the two fixed plates through a bearing, and the outer surface of the rotating rod is fixedly connected with a driving gear.

[0012] In a preferred embodiment of the utility model, the number of the rotating mechanisms is four, and the four rotating mechanisms are symmetrically distributed in pairs at both ends of the bottom plate.

[0013] In a preferred utility model, auxiliary rotating mechanisms are fixedly connected to the outer surfaces of both ends of the rotary kiln body, and driven gears are fixedly connected to the outer surfaces of the auxiliary rotating mechanisms, and the outer surface teeth of the driven gears mesh with the outer surface teeth of the driving gears.

[0014] In a preferred embodiment of the utility model, the motor is fixedly connected to the upper surface of the left end of the base plate, a rotating shaft is installed at the output end of the motor, and one end of the rotating shaft away from the motor is fixedly connected to the rotating rod.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0016] In the utility model, after high-temperature gas is sent into the interior of the rotary kiln body to burn the material, valve 1 is opened, and the exhausted gas will enter the interior of the insulation pipe from the air outlet, and the insulation pipe is wound on the outer surface of the rotary kiln body, and the residual heat in the exhausted gas can be transferred to the insulation pipe, and then the outer surface of the rotary kiln body is insulated, so as to recycle the heat energy in the exhausted exhaust gas; and the filter can intercept large particles in the exhaust gas, and try to avoid large particles from entering the insulation pipe to cause blockage. When it is necessary to clean the inside of the insulation pipe, the water pump can be started to pump the water inside the water tank, and the pumped water can enter the insulation pipe from the water guide pipe to flush, so as to minimize the attachment of impurities to the inner wall of the insulation pipe, thereby ensuring the insulation effect of the insulation pipe for heat transfer to the outside of the rotary kiln body, thereby improving the recovery rate of residual heat in the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the utility model;

[0018] Figure 2 For the utility model Figure 1 The enlarged view of A in FIG.

[0019] Figure 3 It is a cross-sectional view of the rotary kiln body in the utility model;

[0020] Figure 4 It is a cross-sectional view of the cleaning mechanism in the utility model.

[0021] Markings in the figure: 1-bottom plate, 2-rotary kiln body, 3-motor, 4-rotating mechanism, 5-auxiliary rotating mechanism, 6-insulation pipe, 7-cleaning mechanism, 21-kiln cover, 22-air inlet pipe, 23-air outlet, 24-filter screen, 31-rotating shaft, 41-fixed block, 42-fixed plate, 43-rotating rod, 44-driving gear, 51-driven gear, 61-valve one, 62-valve two, 71-water tank, 72-water inlet, 73-water pump, 74-water pipe. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] The following will be combined Figure 1-Figure 4 A waste heat recovery device for a rotary kiln according to an embodiment of the utility model is described in detail. Example

[0024] Reference Figure 1-Figure 4 A waste heat recovery device for a rotary kiln comprises a bottom plate 1, a rotary kiln body 2, a motor 3 and a rotating mechanism 4, and is characterized in that: the bottom plate 1 and the rotary kiln body 2 are connected through the rotating mechanism 4 and the auxiliary rotating mechanism 5; a kiln cover 21 is installed on the outer side surface of the right end of the bottom plate 1, and an air intake pipe 22 is installed on the outer surface of the kiln cover 21, and the internal volume of the air intake pipe 22 is connected with the internal volume of the rotary kiln body 2; specifically, high-temperature gas can be sent from the air intake pipe 22 into the interior of the rotary kiln body 2 to burn the material.

[0025] Reference Figure 1-Figure 4The inner wall of the rotary kiln body 2 is provided with an air outlet 23, and a filter 24 is installed on the inner surface of the air outlet 23. Specifically, the filter 24 can intercept large particles in the exhaust gas and try to prevent large particles from entering the insulation pipe 6 to cause blockage; an insulation pipe 6 is wound around the outer surface of the rotary kiln body 2, and the inner cavity of the left end of the insulation pipe 6 is connected with the air outlet 23. A valve 1 61 is installed on the outer surface of the insulation pipe 6 close to the air outlet 23, and a valve 2 62 is installed on the outer surface of the insulation pipe 6 away from the air outlet 23; specifically, the high-temperature gas generated after firing the material can enter the interior of the insulation pipe 6 from the air outlet 23, and the insulation pipe 6 is wound on the outer surface of the rotary kiln body 2, and the residual heat in the exhaust gas can be transferred to the insulation pipe 6, thereby insulating the outer surface of the rotary kiln body 2, thereby recycling the heat energy in the exhaust gas.

[0026] Reference Figure 1-Figure 4 A cleaning mechanism 7 is installed on the outer surface of the left end of the rotary kiln body 2. The cleaning mechanism 7 includes a water tank 71. A water inlet 72 is arranged on the upper surface of the water tank 71. The water tank 71 is fixedly connected to the outer surface of the left end of the rotary kiln body 2. A water pump 73 is fixedly installed on the inner bottom surface of the water tank 71. The water inlet of the water pump 73 is connected to the internal volume of the water tank 71. The water outlet of the water pump 73 is connected to a water guide pipe 74. The end of the water guide pipe 74 away from the water pump 73 is connected to the internal volume of the left end of the insulation pipe 6. Specifically, when it is necessary to clean the inside of the insulation pipe 6, the water pump 73 can be started to pump the water inside the water tank 71. The pumped water can enter the insulation pipe 6 from the water guide pipe 74 for flushing, so as to minimize the attachment of impurities to the inner wall of the insulation pipe 6, thereby ensuring the insulation effect of the insulation pipe 6 for heat transfer to the outside of the rotary kiln body 2, thereby improving the recovery rate of the waste heat in the exhaust gas.

[0027] Reference Figure 1-Figure 4 There are four rotating mechanisms 4, and the four rotating mechanisms 4 are symmetrically distributed at the two ends of the base plate 1 in pairs. The rotating mechanisms 4 are installed on the upper surfaces of the two ends of the base plate 1. The rotating mechanisms 4 include two fixed blocks 41, the fixed blocks 41 are fixedly connected to the upper surface of the base plate 1, and the upper surfaces of the two fixed blocks 41 are fixedly connected with fixed plates 42. A rotating rod 43 is rotatably connected between the two fixed plates 42 through a bearing. The motor 3 is fixedly connected to the upper surface of the left end of the base plate 1, and a rotating shaft 31 is installed at the output end of the motor 3. The end of the rotating shaft 31 away from the motor 3 is fixedly connected to the rotating rod 43; specifically, starting the motor 3 can make the rotating shaft 31 drive the rotating rod 43 to rotate.

[0028] Reference Figure 1-Figure 4The outer surface of the rotating rod 43 is fixedly connected with a driving gear 44, and the outer surfaces of both ends of the rotary kiln body 2 are fixedly connected with auxiliary rotating mechanisms 5. The outer surface of the auxiliary rotating mechanism 5 is fixedly connected with a driven gear 51, and the outer surface teeth of the driven gear 51 are meshed with the outer surface teeth of the driving gear 44. Specifically, the rotating rotating rod 43 can drive the driven gear 51 to rotate through the driving gear 44, thereby driving the entire rotary kiln body 2 to rotate, so as to burn the material inside the rotary kiln body 2.

[0029] The implementation principle of the waste heat recovery device of a rotary kiln in the present application is as follows:

[0030] After high-temperature gas is sent from the air inlet pipe 22 into the interior of the rotary kiln body 2 to burn the material, the valve 61 can be opened, and the exhausted gas will enter the interior of the insulation pipe 6 from the air outlet 23. The insulation pipe 6 is wound on the outer surface of the rotary kiln body 2. The residual heat in the exhausted gas can be transferred to the insulation pipe 6, and then the outer surface of the rotary kiln body 2 is insulated, so as to recycle the heat energy in the exhausted exhaust gas; and the filter 24 can intercept large particles in the exhaust gas, and try to avoid large particles from entering the insulation pipe 6 to cause blockage. When it is necessary to clean the interior of the insulation pipe 6, the water pump 73 can be started to pump the water inside the water tank 71. The pumped water can enter the insulation pipe 6 from the water guide pipe 74 for flushing, and the impurities attached to the inner wall of the insulation pipe 6 are minimized, thereby ensuring the insulation effect of the insulation pipe 6 for heat transfer to the outside of the rotary kiln body 2, thereby improving the recovery rate of the residual heat in the exhaust gas.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waste heat recovery device for a rotary kiln, comprising a bottom plate (1), a rotary kiln body (2), a motor (3), a rotating mechanism (4) and an auxiliary rotating mechanism (5), characterized in that: The bottom plate (1) and the rotary kiln body (2) are connected via the rotating mechanism (4) and the auxiliary rotating mechanism (5); An air outlet hole (23) is formed on the inner side wall of the rotary kiln body (2), a filter screen (24) is installed on the inner surface of the air outlet hole (23), an insulation pipe (6) is wound around the outer surface of the rotary kiln body (2), the inner cavity of the left end of the insulation pipe (6) is connected to the air outlet hole (23), a valve 1 (61) is installed on the outer surface of one end of the insulation pipe (6) close to the air outlet hole (23), and a valve 2 (62) is installed on the outer surface of one end of the insulation pipe (6) away from the air outlet hole (23); A cleaning mechanism (7) is installed on the outer surface of the left end of the rotary kiln body (2), and the cleaning mechanism (7) comprises a water tank (71). A water inlet (72) is arranged on the upper surface of the water tank (71). The water tank (71) is fixedly connected to the outer surface of the left end of the rotary kiln body (2). A water pump (73) is fixedly installed on the inner bottom surface of the water tank (71). The water inlet of the water pump (73) is connected to the internal volume of the water tank (71). The water outlet of the water pump (73) is connected to a water guide pipe (74). The end of the water guide pipe (74) away from the water pump (73) is connected to the internal volume of the left end of the insulation pipe (6).

2. The waste heat recovery device for a rotary kiln according to claim 1, characterized in that: A kiln cover (21) is installed on the outer side surface of the right end of the bottom plate (1), and an air inlet pipe (22) is installed on the outer surface of the kiln cover (21), and the internal cavity of the air inlet pipe (22) is connected to the internal cavity of the rotary kiln body (2).

3. The waste heat recovery device for a rotary kiln according to claim 1, characterized in that: The rotating mechanism (4) is mounted on the upper surfaces of both ends of the base plate (1), and comprises two fixed blocks (41), the fixed blocks (41) being fixedly connected to the upper surface of the base plate (1), the upper surfaces of the two fixed blocks (41) being fixedly connected to fixed plates (42), a rotating rod (43) being rotatably connected between the two fixed plates (42) via a bearing, and the outer surface of the rotating rod (43) being fixedly connected to a driving gear (44).

4. The waste heat recovery device for a rotary kiln according to claim 1, characterized in that: The number of the rotating mechanisms (4) is four, and the four rotating mechanisms (4) are symmetrically distributed in pairs at the two ends of the bottom plate (1).

5. The waste heat recovery device for a rotary kiln according to claim 3, characterized in that: An auxiliary rotating mechanism (5) is fixedly connected to the outer surfaces of both ends of the rotary kiln body (2), a driven gear (51) is fixedly connected to the outer surface of the auxiliary rotating mechanism (5), and teeth on the outer surface of the driven gear (51) mesh with teeth on the outer surface of the driving gear (44).

6. The waste heat recovery device for a rotary kiln according to claim 3, characterized in that: The motor (3) is fixedly connected to the upper surface of the left end of the base plate (1); a rotating shaft (31) is installed at the output end of the motor (3); and one end of the rotating shaft (31) away from the motor (3) is fixedly connected to the rotating rod (43).

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