Dust removal device for sintering rotary kiln

Abstract

The dust removal device comprises a dust removal shell connected with the rotary kiln, the dust removal shell comprises a buffering section and a settling section connected with the buffering section, an ash hopper is arranged at the lower end of the settling section, a filtering section is arranged at the upper end of the settling section, and a metal filter cartridge is arranged in the filtering section. According to the utility model, the buffer section is arranged, so that the flow rate of flue gas can be reduced, large-particle dust can be slowed down and steered, the large-particle dust can fall into the ash hopper after entering the settling section, and meanwhile, the flue gas rises to enter the filter section and is filtered by the metal filter cartridge; meanwhile, the dust removal efficiency is improved through the metal filter cartridge, the emission concentration is reduced, and the emission index is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to dust removal technical field especially relates to a dust removal device for sintering rotary kiln. BACKGROUND

[0002] Sintering rotary kiln is an important complete equipment widely used in alumina production plant, and its working principle is to form slurry by mixing red mud, soda, white sludge, soda ash, bauxite-lime mixture and reducing agent. Fuel is supplied and combusted in the sintering furnace of the rotary kiln to produce countercurrent movement of the slurry and the fuel flue gas. When the furnace charge passes through the kiln body, the furnace charge goes through the processes of drying, calcining, sintering and partial cooling in sequence to obtain sintered product, i.e. blocky porous clinker, in the furnace. The high-temperature flue gas generated by combustion needs to be purified by dust removal before being discharged into the atmosphere. The discharged flue gas still has a temperature of 240~280℃, the highest temperature can reach 400℃, and the instantaneous temperature can reach 425℃. The flue gas generated by combustion contains dust of sodium sulfate, sodium chloride, hematite, silicon dioxide, calcium oxide, aluminum oxide and other compounds. In addition to oxygen and nitrogen, the flue gas also contains nitrogen oxides, sulfur dioxide and 40% water vapor. In order to recover useful dust in the flue gas and discharge clean flue gas meeting the emission index, dust removal and flue gas purification are needed.

[0003] The traditional roasting furnace adopts electrostatic dust removal, and the performance of the electrostatic dust collector is affected by three factors, i.e. dust properties, equipment structure and flue gas flow rate. In addition, the dust removal method of the electrostatic dust collector by regular vibration causes secondary dust raising during vibration, resulting in an increase in instantaneous dust emission. Under normal circumstances, the emission concentration of the electrostatic dust collector is usually 30~50mg / m3. The emission index control of such atmospheric pollutants has been improved to 20mg / Nm3, so the electrostatic dust collector cannot meet the production needs. A more effective dust removal device needs to be developed. SUMMARY

[0004] In view of the above technical problems, the utility model provides a dust removal device for sintering rotary kiln to solve the problem that the electrostatic dust collector in the prior art cannot meet the emission index of the flue gas discharged by the sintering rotary kiln.

[0005] In order to achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] The utility model provides a dust removal device for sintering rotary kiln, including dust removal casing connected with rotary kiln, dust removal casing includes buffer section and with buffer section connection settlement section, is equipped with dust hopper with settlement section lower extreme, is equipped with filter section with upper extreme, is equipped with metal filter cartridge in filter section, the utility model discloses a buffer section can reduce flue gas flow velocity through setting, and make big granule dust deceleration turn to, can after entering settlement section big granule dust falls into dust hopper, simultaneously, flue gas rises into filter section and is filtered through metal filter cartridge, and the dust removal efficiency is improved through metal filter cartridge, and the emission concentration is reduced, and the emission index is satisfied.

[0007] Further, the buffer section is provided with multiple layers of inclined baffles, and the baffles are inclined towards the dust hopper.

[0008] Further, the buffer section is connected with the rotary kiln through a variable-diameter section, and the large end of the variable-diameter section is directed towards the side of the settlement section.

[0009] Further, the small end of the variable-diameter section is connected with the rotary kiln through a cooling section.

[0010] Further, the cooling section is provided with a sandwich on the outside for introducing compressed air to cool the flue gas passing through the cooling section.

[0011] Further, the cooling section is connected with the rotary kiln through a dust collection cover.

[0012] Further, the metal filter cartridge is connected with a blowing pipe at the upper end for blowing off dust.

[0013] Further, one end of the blowing pipe is connected with a blowing gas bag, and the blowing gas bag is connected with the sandwich through a compressed air pipeline.

[0014] Further, the filter section is connected with a clean gas chamber at the upper end.

[0015] Further, the clean gas chamber is connected with a chimney through an outlet pipeline, and an induced draft fan is arranged on the outlet pipeline.

[0016] The utility model has the advantages of:

[0017] 1. The cooling section can cool the high-temperature flue gas, and the hot compressed air continuously flowing to the filter section can clean the filter cartridge, and the hot compressed air will not cause the temperature of the filter cartridge to drop suddenly, so that the water vapor in the flue gas condenses and dissolves sulfur dioxide, nitrogen oxides and other corrosive substances in the flue gas, ensuring the normal operation of the equipment.

[0018] 2. The buffer section can reduce the flow rate of the flue gas, and the large-particle dust can be decelerated and turned, so that the large-particle dust falls into the dust hopper after entering the settlement section, and the flue gas rises into the filter section and is filtered through the metal filter cartridge, and the clean flue gas continues to rise into the clean gas chamber and is sucked into the chimney by the induced draft fan through the exhaust pipeline, and is discharged into the atmosphere.

[0019] 3. The utility model discloses a filter section outside sets up and sprays the gas bag, and the compressed air that is heated is blown into the metal filter cartridge through the blowing pipe and is blown off the dust adhered on the filter cartridge, and the dust falls into the ash bucket and is sent away by the ash conveying system.

[0020] 4. The utility model discloses can be used to overcome the rotary kiln flue gas temperature is high, flue gas composition is complex, water vapor content is high, flue gas dust granularity distribution is wide, dust chemical composition is complex's working condition, realizes dust ultra -low emission. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, below will to the drawing needed to use in the embodiment or prior art description simple introduction, obviously, below description's drawing only some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0022] Figure 1 It is the structural schematic diagram of the utility model.

[0023] In the drawing: 1-rotary kiln, 2-dust collection cover, 3-cooling section, 4-buffer section, 5-settling section, 6-ash bucket, 7-filter section, 8-compressed air pipeline, 9-spraying gas bag, 10-blowing pipe, 11-clean gas chamber, 12-inspection door, 13-outlet pipeline, 14-inducing fan, 15-chimney. DETAILED DESCRIPTION

[0024] Below will combine the drawing in the embodiment of the utility model, the technical scheme in the embodiment of the utility model is clearly and completely described, obviously, the described embodiment only is a part of the embodiment of the utility model, instead of all the embodiments. Based on the embodiment in the utility model, all other embodiments that the ordinary skilled person in the art obtains without paying the creative labor premise, all belong to the scope of protection of the utility model.

[0025] As Figure 1 Shown, a dust removal device for sintering rotary kiln in the embodiment 1 of the utility model, including the dust removal shell that is connected with rotary kiln 1, and the dust removal shell includes settling section 5, and the lower end of settling section 5 is equipped with ash bucket 6, and the upper end is equipped with filter section 7. Filter section 7 is equipped with metal filter cartridge. In this embodiment, a plurality of metal filter cartridges are provided in the filter section 7, and the dust is blocked on the outside of the filter cartridge. In another embodiment, filter bags can also be provided in the filter section 7. The buffer section 4 is provided on one side of the settling section 5, and the settling section 5 is connected with the rotary kiln 1 through the buffer section 4. The buffer section 4 can reduce the flue gas flow rate and improve the dust removal effect.

[0026] Further, the buffer section 4 is provided with multiple layers of inclined baffles, and the baffles are inclined toward the ash hopper 6, that is, the multiple layers of baffles are gradually inclined downward from the side close to the rotary kiln 1 to the side close to the settling section 5. By making the multiple layers of inclined baffles slow down and change the direction of movement of the large particles in the flue gas, the large particles can fall into the ash hopper 6 after entering the settling section 5, and then the flue gas rises into the filtering section 7.

[0027] Example 2 differs from Example 1 in that, as shown in Figure 1 the buffer section 4 is connected with the rotary kiln 1 through a variable-diameter section, that is, the buffer section 4 is provided with a variable-diameter section at the side close to the rotary kiln 1, the buffer section 4 is connected with the rotary kiln 1 through the variable-diameter section, and the large end of the variable-diameter section is toward the settling section 5, and the small end of the variable-diameter section is toward the rotary kiln 1.

[0028] Example 3 differs from Example 2 in that, as shown in Figure 1 the small end of the variable-diameter section is connected with the rotary kiln 1 through a cooling section 3, that is, the cooling section 3 is provided between the small end of the variable-diameter section and the rotary kiln 1.

[0029] Further, the cooling section 3 is provided with a sandwich on the outside, and compressed air is introduced into the sandwich for cooling the flue gas passing through the cooling section 3.

[0030] Example 4 differs from Example 3 in that, as shown in Figure 1 the cooling section 3 is connected with the rotary kiln 1 through a dust collection hood 2. The dust collection hood 2 adopts the structure in the prior art.

[0031] Example 5 differs from Example 3 in that, as shown in Figure 1 a blowing pipe 10 is provided at the upper end of the metal filter cylinder in the filtering section 7, the blowing pipe 10 is in communication with the upper end of the metal filter cylinder, and the blowing pipe 10 is used for blowing off the dust on the metal filter cylinder.

[0032] Further, one end of the blowing pipe 10 penetrating out of the filtering section 7 is connected with a blowing gas pack 9, and the blowing gas pack 9 is connected with the sandwich through a compressed air pipeline 8.

[0033] Example 6 differs from Example 1 in that, as shown in Figure 1 the upper end of the filtering section 7 is connected with a clean gas chamber 11.

[0034] Further, the clean gas chamber 11 is connected with a chimney 15 through an outlet pipeline 13, and the outlet pipeline 13 is provided with an induced draft fan 14.

[0035] Example 7 differs from Example 6 in that, as shown in Figure 1 an inspection door 12 is provided at the side of the clean gas chamber 11.

[0036] The working process of the device is as follows:

[0037] The high-temperature flue gas discharged from the rotary kiln 1 is collected by the dust hood 2 and then enters the cooling section 3. The compressed air flows between the two layers of the shell of the cooling section 3, which can cool the high-temperature flue gas in the pipeline and heat the continuously flowing compressed air to clean the filter cartridge in the filtering section 7. The cooled flue gas enters the buffer section 4, and the cross section of the flow channel in the buffer section 4 continuously increases, which can reduce the flue gas flow rate. A plurality of inclined baffles are arranged inside the buffer section 4, which can slow down and change the direction of the large particles in the flue gas. After entering the settling section 5, the large particles fall into the ash hopper 6, and then the flue gas rises into the filtering section 7. A proper number of metal filter cartridges are arranged in the filtering section 7. The dust is blocked outside the filter cartridges, the clean flue gas penetrates the filter cartridges and rises into the clean gas chamber 11, and then is sucked into the chimney 15 by the induced draft fan 14 along the exhaust pipeline 13 and is discharged into the atmosphere.

[0038] The heated compressed air in the cooling section 3 is sprayed into the filter cartridges in turns at intervals to remove the dust outside the filter cartridges. Because the hot compressed air does not cause the temperature of the filter cartridges to drop suddenly, the water vapor in the flue gas does not condense to dissolve the corrosive metal filter cartridges such as sulfur dioxide and nitrogen oxides in the flue gas, which can ensure the normal operation of the equipment. The inspection door 12 arranged on the side of the clean gas chamber 11 facilitates the installation and maintenance of the filter cartridges and the spraying pipe.

[0039] The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A dust removal device for a sintering rotary kiln, characterized by, The dust removal shell is connected with the rotary kiln (1), and the dust removal shell comprises a buffer section (4) and a settling section (5) connected with the buffer section (4), the lower end of the settling section (5) is provided with a dust hopper (6), the upper end is provided with a filtering section (7), the filtering section (7) is provided with a metal filter cartridge, the upper end of the filtering section (7) is connected with a clean gas chamber (11), the buffer section (4) is provided with multiple layers of inclined baffles, and the baffles are inclined towards the dust hopper (6), the buffer section (4) is connected with the rotary kiln (1) through a variable-diameter section, the large end of the variable-diameter section is located on the side of the settling section (5), the small end of the variable-diameter section is connected with the rotary kiln (1) through a cooling section (3), the outer side of the cooling section (3) is provided with a sandwich layer into which compressed air is introduced, and the sandwich layer is used for cooling flue gas passing through the cooling section (3).

2. The dust removal device for a sintering rotary kiln according to claim 1, characterized by, The cooling section (3) is connected with the rotary kiln (1) through a dust collection cover (2).

3. The dedusting device for a sintering rotary kiln according to claim 1 or 2, characterized in that, The upper end of the metal filter cartridge is communicated with a blowing pipe (10) used for blowing off dust.

4. The dust removal device for a sintering rotary kiln according to claim 3, characterized by One end of the blowing pipe (10) is connected with a blowing gas bag (9), the blowing gas bag (9) is connected with the sandwich layer through a compressed air pipeline (8).

5. The dust removal device for a sintering rotary kiln according to claim 1 or 2 or 4, characterized in that, The clean gas chamber (11) is connected with a chimney (15) through an outlet pipeline (13), and an induced draft fan (14) is arranged on the outlet pipeline (13).

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