Hot air dust removal device for coal mill

Abstract

The utility model discloses a coal mill hot air dust removal device which comprises a coal mill hot air pipeline and at least two groups of dust removal bins, an air inlet pipe is arranged on each dust removal bin, a second switch valve and a temperature detector are respectively arranged on each air inlet pipe, and a first switch valve is arranged on the coal mill hot air pipeline. A cooling mechanism is mounted on the outer side of the coal mill hot air pipeline. According to the hot air dust removal device for the coal mill, the cooling mechanism is arranged on the outer side of the hot air pipeline, the hot air is cooled before entering the dust removal bin, the outlet temperature is detected through the temperature detector, and when the temperature is reduced to a proper range, the hot air is conveyed into the dust removal bin; furthermore, multiple sets of dust removal bins are arranged, generally, at least two sets of dust removal bins are arranged, one set of dust removal bins is used normally, and the other set of dust removal bins is standby, when the hot air flow is large or one set of dust removal bins breaks down, the multiple sets of dust removal bins can be selected to be all started or the fault set is shut down, and the standby set is started. And production is not delayed.

Description

Technical Field

[0001] The utility model relates to the technical field of cement production, in particular to a coal mill hot air dust removal device. Background Art

[0002] Coal mill is used to grind raw coal, and the damp raw coal entering the coal mill will affect the grinding effect. Generally, hot air is used to dehumidify the coal to improve the efficiency of the coal mill. In the prior art, the hot air entering the coal mill mainly comes from the hot air flow generated in the cement kiln. The hot air flow contains a lot of sand and dust, which needs to be treated.

[0003] The existing dust removal devices have the following problems. First, the adverse effects of the temperature of the hot air from the coal mill on the dust removal device are difficult to control. When the temperature of the hot air is high, it is easy to explode after entering the dust removal device. At the same time, due to the large temperature difference, the alternation of hot and cold causes the dust to cool down and condense rapidly. A certain amount of water vapor will be generated inside, causing the dust to adhere to the inner wall of the machine. If the temperature of the hot air gas is too low, it is easy to cause dust accumulation and block the filter bag. Second, currently a coal mill is only equipped with one dust removal device. Once the dust removal device fails, it needs to be shut down immediately for maintenance, delaying production. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies of the prior art, the utility model provides a coal mill hot air dust removal device, which solves the problem of low efficiency of the prior coal mill hot air dust removal device.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coal mill hot air dust removal device, comprising a coal mill hot air duct, at least two groups of dust removal bins, the dust removal bins are provided with air inlet pipes, the air inlet pipes are respectively provided with a second switch valve and a temperature detector, and the coal mill hot air duct is provided with a first switch valve.

[0008] A cooling mechanism is installed on the outside of the coal mill hot air duct.

[0009] A plurality of groups of bag filters are arranged in the dust removal bin, a dust collecting hopper corresponding to the bag filter is arranged below the dust removal bin, and a third switch valve is installed on the dust collecting hopper.

[0010] An outlet is installed on the top of the dust removal bin, and an activated carbon filter layer is arranged in the outlet.

[0011] A back-blowing mechanism is provided on the top of the dust removal bin.

[0012] As a further preference, the cooling mechanism comprises a box body, a cooling cavity is arranged in the box body, a water inlet and a water outlet are respectively arranged on the cooling cavity, and a coal mill hot air duct runs through the box body.

[0013] As a further preference, the reverse air blowing mechanism includes an air pump, an air inlet pipe and an air blowing head. There are multiple groups of air blowing heads, and the multiple groups of air blowing heads are connected to the air pump through the air inlet pipe. The air blowing heads are located directly above the bag filter element.

[0014] As a further preference, the inner wall of the dust removal bin is provided with an electric heating tube, and the electric heating tube is located on the outside of the bag filter element.

[0015] As a further preference, an explosion-proof valve is provided on the dust removal bin.

[0016] (III) Beneficial effects

[0017] The utility model provides a coal mill hot air dust removal device, which has the following beneficial effects:

[0018] The coal mill hot air dust removal device sets a cooling mechanism on the outside of the hot air duct to cool the hot air before it enters the dust removal bin, and uses a temperature detector to detect the outlet temperature. When the temperature drops to an appropriate range, the hot air is transported to the dust removal bin, thereby avoiding the adverse effects of too high or too low hot air temperature. Furthermore, by equipping multiple groups of dust removal bins, generally at least two groups are equipped, one group for normal use and one group for standby. When the hot air flow is large or one of them fails, all the multiple groups of dust removal bins can be started, or the failed unit can be shut down and the standby unit can be activated, so as not to delay production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model.

[0020] In the figure: 1. Coal mill hot air duct; 2. Dust removal bin; 3. Air inlet pipe; 4. First switch valve; 5. Second switch valve; 6. Temperature detector; 7. Box; 8. Water inlet; 9. Water outlet; 10. Cooling chamber; 11. Bag filter element; 12. Dust hopper; 13. Third switch valve; 14. Outlet; 15. Activated carbon filter layer; 16. Air pump; 17. Air inlet pipe; 18. Air blowing head; 19. Electric heating tube; 20. Explosion-proof valve. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0022] like Figure 1As shown, the utility model provides a technical solution: a coal mill hot air dust removal device, comprising a coal mill hot air duct 1, at least two groups of dust removal bins 2, an air inlet pipe 3 is arranged on the dust removal bin 2, and a second switch valve 5 and a temperature detector 6 (a thermocouple temperature detector is selected) are respectively arranged on the air inlet pipe 3, and a first switch valve 4 is arranged on the coal mill hot air duct 1. It should be noted that two groups of dust removal bins 2 can be set, one group is used normally, and the other group is on standby. When the hot air flow is too large, the standby bin is opened to relieve the conveying pressure. When one of the groups fails, it can be immediately switched to the other group for use without delaying the production progress.

[0023] A cooling mechanism is installed on the outside of the coal mill hot air duct 1, and the cooling mechanism includes a box body 7, a cooling chamber 10 is arranged in the box body 7, and a water inlet 8 and a water outlet 9 are respectively arranged on the cooling chamber 10. The coal mill hot air duct 1 runs through the box body 7, and the water after absorbing heat is discharged through the water outlet 9 and can be used for other purposes.

[0024] A plurality of groups of bag filters 11 are arranged in the dust removal bin 2 , a dust collecting hopper 12 corresponding to the bag filters 11 is arranged below the dust removal bin 2 , and a third switch valve 13 is installed on the dust collecting hopper 12 .

[0025] The inner wall of the dust removal bin 2 is provided with an electric heating tube 19, which is located on the outside of the bag filter element 11. The purpose of providing the electric heating tube 19 is to turn on the electric heating tube 19 to appropriately increase the temperature in the bin when the temperature is low in order to avoid condensation caused by the large temperature difference between the hot air and the inside of the bin.

[0026] An outlet 14 is installed at the top of the dust removal bin 2, and an activated carbon filter layer 15 is arranged in the outlet 14. The gas can be discharged into the air after being filtered by the activated carbon filter layer 15.

[0027] The dust removal bin 2 is provided with an explosion-proof valve 20, and the purpose of providing the explosion-proof valve 20 is to prevent the bin body from exploding in extreme cases.

[0028] A back-blowing mechanism is provided on the top of the dust removal bin 2, and the back-blowing mechanism includes an air pump 16, an air intake pipe 17 and an air blowing head 18. There are multiple groups of air blowing heads 18, and the multiple groups of air blowing heads 18 are connected to the air pump 16 through the air intake pipe 17. The air blowing head 18 is located directly above the bag filter element 11. Turn on the air pump 16, and back-blow air to the bag filter element 11 through the air blowing head 18 to clean the filter element.

[0029] Meanwhile, the contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field.

[0030] When in use, the hot air inside the coal mill is directly connected to the coal mill hot air duct 1, and the first switch valve 4 is opened, and the hot air enters the coal mill hot air duct 1.

[0031] In order to quickly cool down the hot air, cold water is injected into the cooling chamber 10 through the water inlet 8. Through the heat exchange, the heat of the hot air is transferred to the cold water. The outlet temperature is detected by the temperature detector 6. When the temperature meets the requirements for entering the warehouse, the second switch valve 5 is opened to send the hot air into the dust removal warehouse 2. After the hot air is filtered by the bag filter element 11, dust and other impurities fall into the dust collecting hopper 12 below, and the gas is discharged through the top outlet 14. The third switch valve 13 is opened to regularly discharge the impurities in the dust collecting hopper 12.

[0032] To summarize, the coal mill hot air dust removal device, by arranging a cooling mechanism on the outside of the hot air duct, cools the hot air before the hot air enters the dust removal bin, and detects the outlet temperature through a temperature detector. When the temperature drops to an appropriate range, the hot air is transported to the dust removal bin, thereby avoiding the adverse effects of too high or too low hot air temperature. Furthermore, by equipping multiple groups of dust removal bins, generally at least two groups are equipped, one group for normal use and one group for standby. When the hot air flow is large or one of them fails, multiple groups of dust removal bins can be selected to start all at once, or the failed unit can be shut down and the standby unit can be activated, so as not to delay production.

[0033] It should be noted that the electrical components appearing in this article are all connected to the external main controller and 220V or 380V mains electricity, and the main controller can be a conventional known device for controlling computers, etc. Its control principle, internal structure and control switch mode are all conventional means of the prior art, which are directly quoted here without further elaboration. In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal mill hot air dust removal device, characterized in that: The invention comprises a coal mill hot air duct (1) and at least two groups of dust removal bins (2); the dust removal bin (2) is provided with an air inlet pipe (3); the air inlet pipe (3) is respectively provided with a second switch valve (5) and a temperature detector (6); and the coal mill hot air duct (1) is provided with a first switch valve (4); A cooling mechanism is installed on the outer side of the coal mill hot air duct (1); A plurality of groups of bag filters (11) are arranged in the dust removal bin (2), a dust collecting hopper (12) corresponding to the bag filter (11) is arranged below the dust removal bin (2), and a third switch valve (13) is installed on the dust collecting hopper (12); An outlet (14) is installed at the top of the dust removal bin (2), and an activated carbon filter layer (15) is arranged in the outlet (14); A back-blowing mechanism is arranged on the top of the dust removal bin (2).

2. A coal mill hot air dust removal device according to claim 1, characterized in that: The cooling mechanism comprises a box (7), a cooling chamber (10) is arranged in the box (7), a water inlet (8) and a water outlet (9) are respectively arranged on the cooling chamber (10), and a coal mill hot air pipeline (1) runs through the box (7).

3. A coal mill hot air dust removal device according to claim 1, characterized in that: The reverse air blowing mechanism comprises an air pump (16), an air intake pipe (17) and an air blowing head (18). The air blowing head (18) comprises multiple groups. The multiple groups of air blowing heads (18) are connected to the air pump (16) through the air intake pipe (17). The air blowing head (18) is located directly above the bag filter element (11).

4. A coal mill hot air dust removal device according to claim 1, characterized in that: The inner wall of the dust removal bin (2) is provided with an electric heating pipe (19), and the electric heating pipe (19) is located outside the bag filter element (11).

5. A coal mill hot air dust removal device according to claim 1, characterized in that: The dust removal bin (2) is provided with an explosion-proof valve (20).

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