Dust removal method in aluminum alloy smelting process

Abstract

The invention relates to the technical field of aluminum alloy production, provides a dust removal method in an aluminum alloy smelting process, and solves the problem of high maintenance cost of an existing dust removal method in the aluminum alloy smelting process. The dust removal method in the aluminum alloy smelting process is applied to the dust removal device, the dust removal device comprises a shell, an air inlet and an air outlet are formed in the upper side and the lower side of the shell respectively, a plurality of dust collection pipes are arranged in the shell, a discharge column is arranged in each dust collection pipe, air holes are formed in each dust collection pipe, and dust collection nets are arranged on the two sides of each dust collection pipe. A gas collection channel is arranged on the outer side of each dust collection net, and the discharge state of discharge columns close to the two sides of each gas collection channel is controlled according to the gas flow in each gas collection channel, so that dust removal is achieved; by designing the discharging column, the dust collecting pipe and the dust collecting net, most smoke dust can be removed through cooperation of the discharging column and the dust collecting pipe, the burden of the dust collecting net is relieved, the maintenance frequency is reduced, and therefore the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy production, and particularly relates to a dust removal method during the melting process of aluminum alloy. Background Art

[0002] With the rapid development of China's economy and the advancement of the industrialization process, non-ferrous metal smelting industries such as aluminum and magnesium have developed greatly. Among them, aluminum-magnesium alloys are widely used in industries such as aerospace, automobile manufacturing, and architectural decoration due to their excellent mechanical properties and good corrosion resistance. However, the production process of aluminum-magnesium alloys also generates a large amount of harmful gases, such as sulfur dioxide, nitrogen oxides, etc. These gases will seriously pollute the air and have a serious impact on human health and the ecological environment.

[0003] In existing production lines, for the flue gas generated during the melting process, the general method is to use a bag filter to remove dust from the gas generated during the melting process. However, after a certain dust removal cycle, the dust on the surface of the bag of the bag filter will block the mesh holes on the surface of the bag, and it needs to be replaced regularly, resulting in high maintenance costs. Summary of the Invention

[0004] Therefore, in view of the above problems, the present invention provides a dust removal method during the melting process of aluminum alloy, which solves the problem of high maintenance costs of the existing dust removal method during the melting process of aluminum alloy.

[0005] To achieve the above object, the present invention is realized through the following technical solutions:

[0006] A dust removal method during the melting process of aluminum alloy, comprising the following steps:

[0007] S1. Collect the flue gas generated during the aluminum melting process, ensure that the flue gas flows along a determined path, and ensure that the flue gas does not leak into the working environment;

[0008] S2. Cool the collected flue gas to below 100 °C;

[0009] S3. Introduce the cooled gas into a dust removal device, the dust removal device includes a housing, an air inlet and an air outlet are respectively arranged on the upper and lower sides of the housing, a plurality of dust collection pipes are arranged in the housing, a discharge column is arranged in each dust collection pipe, a ventilation hole is arranged on each dust collection pipe, dust collection nets are arranged on both sides of each dust collection pipe, and a gas collection channel is arranged outside each dust collection net;

[0010] S4. Control the discharge state of the discharge columns adjacent to both sides of each gas collection channel according to the gas flow rate in each gas collection channel to achieve dust removal.

[0011] Further, when the flow rate difference between the air inlet and the air outlet reaches a preset first difference value, control all the discharge columns to discharge.

[0012] Further, the method further includes the following steps:

[0013] S5. When the flow rate difference between the air inlet and the air outlet reaches a preset second difference value, control each of the discharge columns to stop discharging.

[0014] Further, the method further includes the following steps:

[0015] S6. Calculate the working duration of each discharge column according to the time difference between the start of discharge and the end of discharge of each discharge column;

[0016] S7. Compare the working duration of each discharge column with a preset duration to judge the clogging condition of each dust collection net on both sides of each adjacent discharge column.

[0017] Further, the dust removal device further includes a plurality of nozzles, each nozzle is respectively arranged on the top of each dust collection pipe, and the dust removal method in the aluminum alloy melting process further includes the following steps:

[0018] S8. When the working duration of each discharge column is less than the preset duration, start each nozzle to clean the dust collection pipes.

[0019] Further, the dust removal device further includes an opening and closing component, the opening and closing component includes a fixed frame and a plurality of lifting cylinders, each lifting cylinder is arranged on the periphery of the fixed frame, each dust collection pipe is connected to the top of the fixed frame, a conical head is arranged at the bottom of the dust collection pipe, and a vibration module is arranged on the side wall of each gas collection channel. The dust removal method in the aluminum alloy melting process further includes the following steps:

[0020] S9. When the working duration of each discharge column is less than the preset duration, start each lifting cylinder to lower each dust collection pipe, and start each vibration module to clean the dust collection nets.

[0021] Further, the dust removal device further includes a plurality of relays, each relay is respectively connected to each discharge column, and step S4 further includes: when the gas flow rate in each gas collection channel reaches a preset first flow rate, control the corresponding relays to connect each discharge column to the negative electrode.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. In the present invention, by designing a discharge column, a dust collection pipe, and a dust collection net, when the gas flow rate in the gas collection channel is greater than a preset first flow rate, most of the soot can be removed first through the cooperation of the discharge column and the dust collection pipe, reducing the burden on the dust collection net, thereby reducing the maintenance frequency and maintenance cost.

[0024] 2. In the present invention, by designing a discharge column, a dust collection pipe, and a dust collection net, when the gas flow rate in the gas collection channel is less than the preset first flow rate, after the dust collection net has been working for a certain period of time, when the flow rate difference between the air inlet and the air outlet reaches a preset first difference value, the cooperation of the discharge column and the dust collection pipe is started to jointly remove dust. Similarly, the burden on the dust collection net can be reduced, the maintenance frequency can be lowered, and the maintenance cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a flowchart of the dust removal method during the aluminum alloy melting process in the first embodiment of the present invention;

[0026] Figure 2 It is a flowchart of the dust removal method during the aluminum alloy melting process in the preferred embodiment of the present invention;

[0027] Figure 3 It is a schematic structural diagram of the dust removal device in the first embodiment of the present invention;

[0028] Figure 4 It is a schematic structural diagram of the air vent setting in the first embodiment of the present invention;

[0029] Figure 5 It is a flowchart of the dust removal method during the aluminum alloy melting process in the second embodiment of the present invention.

[0030] DESCRIPTION OF THE REFERENCE NUMERALS IN THE DRAWINGS

[0031] Housing 1; Air inlet 11; Air outlet 12;

[0032] Dust collection pipe 2; Air vent 21; Conical head 22;

[0033] Discharge column 3;

[0034] Dust collection net 4;

[0035] Gas collection channel 5; Vibration module 51;

[0036] Spray head 6;

[0037] Opening and closing component 7; Fixed frame 71; Lifting cylinder 72. DETAILED DESCRIPTION OF THE INVENTION

[0038] The following will specifically describe the implementation manners of the present invention in detail, so as to fully understand how the present invention uses technical means to solve technical problems and the implementation process of achieving technical effects, and to implement accordingly.

[0039] Example 1

[0040] As Figures 1 to 4 shown, the specific process will be elaborated in detail below:

[0041] S1. Collect the flue gas generated during the aluminum smelting process, ensure that the flue gas flows along a definite path, and guarantee that the flue gas will not leak into the working environment.

[0042] The flue gas generated during the aluminum alloy smelting process includes: solid metal particles formed during the cooling of molten aluminum alloy, oxides (such as alumina) and sulfide particles, carbon black particles, sand grains, and dust, etc. The existence of these particulate matters will not only pollute the environment but also may have an adverse impact on human health. To reduce the treatment pressure of the dust removal device, in this embodiment, the collected flue gas is connected to the dust removal device after passing through an upward-bending pipe, so that heavier solid metal particles, sand grains, etc. precipitate at the bottom of the upward-bending pipe.

[0043] S2. Cool the collected flue gas to below 100°C. In this embodiment, the collected flue gas is cooled twice to below 80°C. The cooling device uses a corrosion-resistant heat exchanger, which can be purchased on the market and will not be elaborated here.

[0044] Lighter sulfide particles in the flue gas will enter the dust removal device along the upward-bending pipe, and the water vapor existing in the flue gas combines with sulfides to produce corrosive acidic substances. Cooling and then entering the dust removal equipment can avoid the corrosion of the flue gas to the dust removal equipment and ensure the service life of the dust removal equipment.

[0045] S3. Introduce the cooled gas into the dust removal device. The dust removal device includes a housing 1. An air inlet 11 and an air outlet 12 are respectively provided on the upper and lower sides of the housing 1. Nine dust collection pipes 2 are provided in the housing 1. A discharge column 3 is provided in each of the dust collection pipes 2. A ventilation hole 21 is provided on each of the dust collection pipes 2. Dust collection nets 4 are provided on both sides of each of the dust collection pipes 2. An air collection channel 5 is provided outside each of the dust collection nets 4.

[0046] It should be noted that each of the dust collection pipes 2 is a tubular shape with a closed top and an opening at the bottom. The top of each of the dust collection pipes 2 is electrically connected to the electric anode, and the bottom of each of the discharge columns 3 is electrically connected to the electric cathode. The ventilation holes 21 are evenly spaced on the surface of each of the dust collection pipes 2.

[0047] S4. Control the discharge states of the discharge columns 3 adjacent to both sides of each of the gas collection channels 5 according to the gas flow rates in the respective gas collection channels 5 to achieve dust removal. The dust removal device further includes a number of relays (not shown in the figure), and each of the relays is respectively connected to each of the discharge columns 3. In this embodiment, when the gas flow rate in each of the gas collection channels 5 is greater than a preset first flow rate, control the corresponding relays to connect each of the discharge columns to the negative electrode 3. First, most of the soot is removed through the cooperation of the discharge columns 3 and the dust collection pipe 2, reducing the burden on the dust collection net 4, so as to reduce the maintenance frequency and thus reduce the maintenance cost. The relays can be purchased on the market and will not be elaborated here.

[0048] Among them, the setting of the first flow rate is specifically adjusted according to the size of the dust removal equipment. When the gas flow rate in the gas collection channel 5 is greater than the preset first flow rate, it indicates that the flue gas flow rate is large. If the dust collection net 4 bears the burden uniformly, it will cause a sharp drop in the air permeability of the dust collection net 4 and an excessive pressure in the housing 1. Therefore, the dust removal method proposed in this application can handle a larger flue gas flow rate with the same size as a traditional bag filter.

[0049] S5. When the flow rate difference between the air inlet 11 and the air outlet 12 reaches a preset second difference, control each of the discharge columns 3 to stop discharging.

[0050] S6. Calculate the working duration of each of the discharge columns 3 according to the time difference between the start and end of the discharge of each of the discharge columns 3.

[0051] S7. Compare the working duration of each of the discharge columns 3 with a preset duration to judge the clogging conditions of the dust collection nets 4 on both sides of each of the discharge columns 3.

[0052] Among them, the calculation of the time difference can be realized by an integrated circuit chip with signal processing capabilities, which can be a microprocessor or a digital signal processor, etc. This is a conventional technical means and will not be elaborated here.

[0053] When the working duration of each of the discharge columns 4 is less than the preset duration, it indicates that the clogging condition of the dust collection net 4 does not require shutdown for cleaning; when the working duration of each of the discharge columns 3 is greater than the preset duration, it indicates that the clogging condition of the dust collection net 4 requires shutdown for cleaning.

[0054] The dust removal device further includes a number of spray heads 6, and each of the spray heads 6 is respectively arranged on the top of each of the dust collection pipes 2.

[0055] In this embodiment, since the working duration of each of the discharge columns 3 is less than the preset duration, step S8 is performed after step S7.

[0056] In other preferred embodiments, the operating duration of at least 20% or more of the discharge columns 3 is greater than a preset duration, and the machine stops to clean the corresponding dust collection net 4.

[0057] S8. The operating duration of each of the discharge columns 3 is less than the preset duration, and each of the nozzles 6 is started to clean the dust on each of the dust collection pipes 2.

[0058] At this time, each of the discharge columns 3 is in a power-off state. Under the jet action of the nozzle 6, the particles adsorbed on the surface of the dust collection pipe 2 will flow to the surface of the dust collection net 4 again under the drive of the smoke flow through the air holes 21 and be blocked. The nozzle can eject air flow once or eject air flow at intervals multiple times.

[0059] The dust removal device further includes an opening and closing component 7. The opening and closing component 7 includes a fixed frame 71 and four lifting cylinders 72. Each of the lifting cylinders 72 is arranged on the periphery of the fixed frame 71. Each of the dust collection pipes 2 is connected to the top of the fixed frame 71. A conical head 22 is provided at the bottom of the dust collection pipe 2. A vibration module 51 is provided on the side wall of each of the air collection channels 5. The vibration module 51 uses a vibrator that can be purchased on the market.

[0060] After step S8, step S9 is performed.

[0061] S9. When the operating duration of each of the discharge columns 3 is less than the preset duration, each of the lifting cylinders 72 is started to move each of the dust collection pipes 2 downward, and each of the vibration modules 51 is started to clean the dust on each of the dust collection nets 4.

[0062] After the dust cleaning is completed, the lifting cylinder 72 restores the position of the conical head 22 and returns to step S4 again.

[0063] In other preferred embodiments, step S9 can also be directly performed after step S7, or when step S8 is performed after several cycles of step S7, step S9 is performed after step S7 in the next cycle.

[0064] Embodiment 2

[0065] Different from Embodiment 1, in this embodiment, the following steps are further included between step S4 and step S5: when the flow difference between the air inlet 11 and the air outlet 12 reaches a preset first difference, in order to control the pressure in the control housing 1, the corresponding relays are controlled to connect each of the discharge columns 3 to the negative electrode. Although the distribution of the particles in the flue gas is basically uniform after entering the housing, there is still a situation where individual discharge columns 3 are not turned on when the flow difference between the air inlet 11 and the air outlet 12 reaches a second difference. Therefore, the setting of the first difference can avoid this situation and give full play to the energy efficiency.

[0066] Although the present invention has been specifically shown and described in connection with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A dust removal method during the melting process of aluminum alloy, characterized in that, It includes the following steps: S1. Collect the flue gas generated during the aluminum melting process, ensure that the flue gas flows along a definite path, and guarantee that the flue gas will not leak into the working environment; S2. Cool the collected flue gas to below 100 °C; S3. Introduce the cooled gas into a dust removal device. The dust removal device includes a housing. An air inlet and an air outlet are respectively arranged on the upper and lower sides of the housing. A number of dust collection pipes are arranged in the housing. A discharge column is arranged in each dust collection pipe. A ventilation hole is arranged on each dust collection pipe. Dust collection nets are arranged on both sides of each dust collection pipe. An air collection channel is arranged outside each dust collection net; S4. Control the discharge state of the discharge columns adjacent to both sides of each air collection channel according to the gas flow rate in each air collection channel to achieve dust removal.

2. The dust removal method during the aluminum alloy melting process according to claim 1, wherein: When the flow rate difference between the air inlet and the air outlet reaches a preset first difference value, control all the discharge columns to discharge.

3. The dust removal method during the aluminum alloy melting process according to claim 1, characterized in that, It further includes the following steps: S5. Control each discharge column to stop discharging according to the flow rate difference between the air inlet and the air outlet reaching a preset second difference value.

4. The dust removal method during the aluminum alloy melting process according to claim 3, wherein It further includes the following steps: S6. Calculate the working duration of each discharge column according to the time difference between the start and end of discharge of each discharge column; S7. Compare the working duration of each discharge column with a preset duration to judge the blockage condition of each dust collection net adjacent to both sides of each discharge column.

5. A dust removal method during the melting process of aluminum alloy according to claim 4, characterized in that, The dust removal device further includes a number of spray heads, and each spray head is respectively arranged on the top of each dust collection pipe. The dust removal method during the aluminum alloy melting process further includes the following steps: S8. When the working duration of each discharge column is less than the preset duration, start each spray head to clean the dust collection pipes.

6. A dust removal method during the melting process of aluminum alloy according to claim 1, characterized in that, The dust removal device further includes an opening and closing component. The opening and closing component includes a fixed frame and a number of lifting cylinders. Each lifting cylinder is arranged on the periphery of the fixed frame. Each dust collection pipe is connected to the top of the fixed frame. A conical head is arranged at the bottom of the dust collection pipe. A vibration module is arranged on the side wall of each air collection channel. The dust removal method during the aluminum alloy melting process further includes the following steps: S9. When the working duration of each discharge column is less than the preset duration, start each lifting cylinder to move each dust collection pipe downward, and start each vibration module to clean the dust collection nets.

7. A dust removal method during the melting process of aluminum alloy according to claim 1, characterized in that: The dust removal device further includes a number of relays, and each relay is respectively connected to each discharge column. Step S4 further includes: when the gas flow rate in each air collection channel reaches a preset first flow rate, control the corresponding relays to connect each discharge column to the negative electrode.

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