Induced-heating air pipe for reducing feeding water of air-swept ball mill

Abstract

The utility model relates to the technical field of cement clinker production, in particular to a hot air inducing pipe for reducing feeding moisture of an air-swept ball mill, which comprises a pipe body and is characterized in that one end of the pipe body is communicated with a discharging end of a constant feeder, and the other end of the pipe body is inserted into a feeding chamber of the air-swept ball mill; the pipe body can heat pulverized coal entering the air-swept ball mill, and the pipeline capable of heating the pulverized coal is additionally arranged, so that the temperature of pulverized coal raw materials entering the air-swept ball mill from the feeding chamber is greatly increased, and the water content of the pulverized coal discharged after subsequent processing in the air-swept ball mill is reduced; the problems that when an existing air-swept ball mill is used, due to the fact that the temperature of a feeding chamber is low, the moisture content of pulverized coal discharged from the air-swept ball mill is too large, part of the moisture content reaches 4.7%, serious deviation is smaller than or equal to 2.5%, and the effect is poor when air distribution and the thickness of a material layer of a grate cooler are simply improved are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of cement clinker production, in particular to a heat-inducing air duct for reducing the moisture content of feed materials of an air-swept ball mill. Background Art

[0002] Air-swept ball mill is an important equipment for cement processing, which is used for drying and grinding coal powder. The equipment is mainly composed of feed chamber, main bearing, rotating part, transmission device, high-pressure starting device and lubrication system. The raw material enters the mill from the feed chamber through the feeding device, and the hot air enters the mill from the air inlet pipe. With the rotation of the mill cylinder, the coal and the hot air exchange heat in the mill, and the coal is crushed and ground in the mill. While the coal is being ground, the fine powder is carried out of the mill through the hot air in the mill and the discharge device.

[0003] In actual production, after the coal powder is discharged from the raw coal bin, it is weighed by a quantitative feeder and then transported to the air-swept ball mill through a conveyor belt. However, due to the low temperature in the feeding chamber, the moisture content of the coal powder discharged from the air-swept ball mill is too high, with a part reaching 4.7%, seriously deviating from the control index of ≤2.5%. Simply increasing the air supply and material layer thickness of the grate cooler has a poor effect. Utility Model Content

[0004] In view of the above problems, the utility model provides a heat-inducing air duct for reducing the moisture content of feed materials of an air-swept ball mill.

[0005] The technical solution adopted is a heat-inducing air duct for reducing the moisture content of the feed of an air-swept ball mill, comprising a tube body, characterized in that one end of the tube body is connected to the discharge end of a quantitative feeder, and the other end of the tube body is inserted into the feed chamber of the air-swept ball mill, and the tube body can heat the coal powder entering the air-swept ball mill.

[0006] Furthermore, the tube body is wrapped with a heat-insulating sleeve, and a limiting ring is also provided on the tube body near the connection between the tube body and the feeding chamber.

[0007] Optionally, a mounting groove for fixing a limiting ring is provided near the connection between the pipe body and the feeding chamber of the insulation sleeve.

[0008] Optionally, a hot air input pipe and a hot air output pipe are provided in the insulation sleeve, and the hot air input pipe and the hot air output pipe are connected through an expansion joint.

[0009] Furthermore, a limiting hole is provided on the limiting ring, and both the hot air input pipe and the hot air output pipe can pass through the limiting hole.

[0010] Optionally, a moisture drain pipe is connected to the top of the feeding chamber.

[0011] The beneficial effects of the present utility model include at least one of the following:

[0012] 1. By adding a pipeline that can heat the coal powder, the temperature of the coal powder raw materials entering the feeding chamber is greatly increased, which is beneficial to reduce the water content of the coal powder discharged after subsequent processing in the air-swept ball mill.

[0013] 2. The hot air input pipe and hot air output pipe are fixed and limited by the provided insulation pipe and limiting ring, so as to reduce the pipe deformation caused by the long-term introduction of high-temperature airflow.

[0014] 3. The problem that the moisture content of the coal powder discharged from the existing air-swept ball mill is too high due to the low temperature of the feeding chamber during use, with a part reaching 4.7%, seriously deviating from the control index of ≤2.5%, and simply increasing the air distribution and material layer thickness of the grate cooler has poor effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the connection structure of the air-swept ball mill;

[0016] Figure 2 It is a schematic diagram of the connection structure between the heat-introducing air duct and the feeding chamber;

[0017] Figure 3 Schematic diagram of the limiting ring structure;

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of the hot air duct;

[0019] Figure 5 It is a schematic diagram of the connection structure of the hot air input pipe and the hot air output pipe;

[0020] The accompanying drawings are denoted as follows: 1 is a belt conveyor, 2 is an air-swept ball mill, 3 is a powder selector, 4 is a quantitative feeder, 5 is a pipe body, 6 is a feeding chamber, 7 is a limit ring, 8 is an insulation sleeve, 9 is a hot air input pipe, 10 is a hot air output pipe, 11 is a mounting groove, and 12 is an expansion joint. DETAILED DESCRIPTION

[0021] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0022] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0023] like Figures 1 to 5 As shown, a heat-inducing air duct for reducing the moisture content of the feed of an air-swept ball mill includes a tube body 5, characterized in that one end of the tube body 5 is connected to the discharge end of a quantitative feeder 4, and the other end of the tube body 5 is inserted into the feed chamber 6 of the air-swept ball mill 2, and the tube body 5 can heat the coal powder entering the air-swept ball mill 2.

[0024] The purpose of this design is to significantly increase the temperature of the coal powder raw materials entering the feed chamber by adding a pipeline that can heat the coal powder, which is beneficial to reducing the moisture content of the coal powder discharged after subsequent processing in the air-swept ball mill.

[0025] The invention solves the problem that the moisture content of pulverized coal discharged from the existing air-swept ball mill is too high due to the low temperature of the feeding chamber during use, with a part reaching 4.7%, seriously deviating from the control index of ≤2.8%, while simply increasing the air distribution and material layer thickness of the grate cooler has poor effect.

[0026] In actual use, the year-on-year increase and decrease data (%) of the air-swept ball mill inlet temperature (°C), outlet temperature (°C), outlet coal powder moisture (%) and inlet coal powder moisture were statistically analyzed from 2019 to 2020, as shown in the following table:

[0027]

[0028] Among them, the existing connection structure was used throughout 2019 and January 2020, and the equipment was modified in February and March 2020. It can be seen that after adding the heat-introducing air duct, the inlet temperature of the mill was greatly improved, to about 100°C, and the moisture content after leaving the mill was also greatly reduced, which can meet the control index of ≤2.8%.

[0029] In the present embodiment, a specific structure of a hot air duct is provided, wherein the tube body of the tube body 5 is wrapped with an insulation sleeve 8, and a limiting ring 7 is further provided on the tube body 5 near the connection between the tube body 5 and the feeding chamber 6, and an installation groove 11 for fixing the limiting ring 7 is provided on the insulation sleeve 8 near the connection between the tube body 5 and the feeding chamber 6, a hot air input pipe 9 and a hot air output pipe 10 are provided in the insulation sleeve 8, and the hot air input pipe 9 and the hot air output pipe 10 are connected through an expansion joint 12, a limiting hole is provided on the limiting ring 7, and the hot air input pipe 9 and the hot air output pipe 10 can both pass through the limiting hole.

[0030] The purpose of this design is to heat the pulverized coal in the hot air duct by setting up hot air inlet pipes and hot air outlet pipes. Usually, the high-temperature section airflow of the cement kiln head boiler is used.

[0031] Furthermore, the hot air input pipe and the hot air output pipe are connected by an additional expansion joint, which can avoid expansion and deformation of the pipes on the one hand, and form a heat collection area at the connection between the pipe body and the feeding chamber for heating on the other hand.

[0032] At the same time, since the pipeline is set by wrapping it with filling insulation material, if the hot air input pipe and the hot air output pipe are not limited and fixed, the vibration of the pipeline caused by the airflow over a long period of time will cause the pipeline to be unstable and produce pipe vibration sound. Therefore, a limit ring is used in combination with a limit hole for fixation.

[0033] It should be pointed out that, usually, the hot air input pipe 9 and the hot air output pipe 10 are not single pipes, but multiple pipes are connected by connectors, so they can be removed from the limit ring by disassembly during maintenance.

[0034] In this embodiment, a moisture removal pipe is connected to the top of the feeding chamber 6 .

[0035] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat-inducing air duct for reducing the moisture content of feed materials in an air-swept ball mill, comprising a tube body (5), characterized in that: One end of the tube body (5) is connected to the discharge end of the quantitative feeder (4), and the other end of the tube body (5) is inserted into the feed chamber (6) of the air-swept ball mill (2). The tube body (5) can heat the coal powder entering the air-swept ball mill (2); the tube body of the tube body (5) is wrapped with a heat preservation sleeve (8), and a limit ring (7) is provided on the tube body (5) near the connection between the tube body (5) and the feed chamber (6); the heat preservation sleeve (8) is provided with a mounting groove (11) for fixing the limit ring (7) near the connection between the tube body (5) and the feed chamber (6); a hot air input pipe (9) and a hot air output pipe (10) are provided in the heat preservation sleeve (8), and the hot air input pipe (9) and the hot air output pipe (10) are connected through an expansion joint (12).

2. A heat-inducing air duct for reducing moisture in the feed of an air-swept ball mill according to claim 1, characterized in that: The limiting ring (7) is provided with a limiting hole, and both the hot air input pipe (9) and the hot air output pipe (10) can pass through the limiting hole.

3. A heat-inducing air duct for reducing moisture in the feed of an air-swept ball mill according to claim 1 or 2, characterized in that: The top of the feeding chamber (6) is connected to a moisture removal pipe.

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