Dust removal system and dust removal method for a conveying device

Abstract

The application discloses a dust removal system of a conveying device, which is matched with a raw material conveying device and comprises a plurality of discharging devices arranged above the raw material conveying device in a conveying direction, wherein each discharging device comprises, from top to bottom, a stock bin, a first vibrating screen, a weighing hopper and a second vibrating screen; and a negative pressure dust removal device, wherein the negative pressure dust removal device comprises a first dust removal pipeline and a second dust removal pipeline, one end of the first dust removal pipeline is connected with a negative pressure dust removal source, the other end of the first dust removal pipeline is provided with a plurality of first dust removal branches, each first dust removal branch corresponds to the first vibrating screen and the second vibrating screen of the same discharging device, one end of the second dust removal pipeline is connected with the negative pressure dust removal source, the other end of the second dust removal pipeline is provided with a plurality of second dust removal branches, and the plurality of second dust removal branches are arranged at the bottom of the raw material conveying device in the conveying direction, and the position of each second dust removal branch in the vertical direction corresponds to the position of one discharging device. The application further discloses a dust removal method of a conveying device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dust removal device, in particular to a dust removal system and method of conveying device. BACKGROUND

[0002] The conveying and screening of raw materials is one of the most commonly used production systems in the steel industry. From the introduction of raw materials to the conveying of raw material belt conveyors, and finally to production equipment, steel raw material conveyors are widely used in steel plants, mines, coal and other industries for conveying coal, ore, sand and other bulk materials. In the steel production process, it can realize continuous and stable conveying of raw materials and improve production efficiency.

[0003] However, the raw material conveying device in the current steel industry produces a large amount of dust when conveying materials, resulting in a poor workshop environment. Therefore, a dust removal system is required, but the current dust removal system cannot effectively remove dust, or the dust removal equipment needs to work at full power all the time, which is low in environmental protection. SUMMARY

[0004] The present application aims to solve the above problems by providing a dust removal system and method of conveying device to overcome the above problems.

[0005] The technical problems solved by the present application can be solved by the following technical solutions:

[0006] The dust removal system of the conveying device cooperates with the raw material conveying device and comprises:

[0007] A plurality of discharging devices are arranged above the raw material conveying device along the conveying direction, and each discharging device comprises, from top to bottom, a stock bin, a first vibrating screen, a weighing hopper and a second vibrating screen.

[0008] A negative pressure dust removal device, the negative pressure dust removal device comprises a first dust removal pipeline and a second dust removal pipeline, one end of the first dust removal pipeline is connected with a negative pressure dust removal source, the other end is provided with a plurality of first dust removal branches, each first dust removal branch corresponds to the first vibrating screen and the second vibrating screen of the same discharging device, a first adjusting device and a first pressure device are arranged on each first dust removal branch, and a second adjusting device and a first flow device are arranged on the first dust removal pipeline; one end of the second dust removal pipeline is connected with the negative pressure dust removal source, the other end is respectively provided with a plurality of second dust removal branches, the plurality of second dust removal branches are arranged at the bottom of the raw material conveying device along the conveying direction, the position of each second dust removal branch in the vertical direction corresponds to the position of one discharging device, a second flow device is arranged on the second dust removal pipeline, and a third adjusting device and a second pressure device are arranged on each second dust removal branch.

[0009] In a preferred embodiment of the present application, the negative pressure dust removal source comprises a fan and a dust collector.

[0010] In a preferred embodiment of the present application, the front ends of the first dust removal branch and the second dust removal branch are provided with negative pressure dust suction ports.

[0011] In a preferred embodiment of the present application, the raw material conveying device comprises a belt conveying device.

[0012] In a preferred embodiment of the present application, the first adjusting device, the second adjusting device, and the third adjusting device respectively comprise a first adjusting valve, a second adjusting valve, and a third adjusting valve.

[0013] In a preferred embodiment of the present application, the first pressure device and the second pressure device respectively comprise a first pressure gauge and a second pressure gauge.

[0014] In a preferred embodiment of the present application, the first flow device and the second flow device respectively comprise a first differential pressure flowmeter and a second differential pressure flowmeter.

[0015] The dust removal method of the conveying device utilizes the dust removal system of the conveying device according to any one of the technical solutions above, and comprises the following method:

[0016] When the first pressure device detects that the multi-station pressure is uneven, the first adjusting device is used for adjustment.

[0017] The total flow rate of the control system is not less than N1 m / s, and therefore, in the above-mentioned vibration screen start-stop and corresponding dust removal station valve start-stop control logic, when the vibration screen is in action, the first adjusting device of the corresponding dust removal station is opened, but after the vibration screen stops action, under the premise that the flow rate is not less than N1 m / s, the vibration screen is closed one by one, and when the flow rate measured by the first flow device is less than N1 m / s+0.5 m / s, the valve stops closing.

[0018] When the flow rate detected by the first flow device is higher than N2 m / s, the second adjusting device is appropriately closed by 1% every T1 seconds until the flow rate reaches N3 m / s, and the second adjusting device stops action.

[0019] After the flow rate of the first flow device is controlled to be normal, it is observed whether the flow rate displayed by the second flow device exceeds N1 m / s, if it exceeds N1 m / s, the fan speed is lowered by N4 revolutions per time, after the speed is lowered, it is observed whether the flow rate displayed by the second flow device is lower than N1 m / s after a delay of T2 minutes, if it is lower, the speed is maintained, and if it is still higher, the speed is continuously lowered.

[0020] When the first flow device flow rate is controlled normally, if the second flow device displayed flow rate is lower than N5m / s, the fan speed needs to be raised, after the speed is raised, the second flow device displayed flow rate is observed for T3 minutes, if the flow rate is higher than N5m / s, the speed is maintained, if the flow rate is still lower than N5m / s, the speed is continuously raised, during the speed raising process, the second regulating device is appropriately closed, 1% is closed every T4 seconds, until the flow rate reaches N3m / s, the valve stops working.

[0021] In a preferred embodiment of the present application, the method comprises the following steps:

[0022] After the maintenance is completed, the second regulating device is closed, the fan is controlled at 500 revolutions, adjustment is performed to ensure that the pressure value of the second pressure device of each work site maintains in a certain range, mainly -350~

[0023] -450Pa.

[0024] In a preferred embodiment of the present application, N1=17, N2=18.5, N3=18, N4=50, N5=15, T1=10, T2=1, T3=1, T4=10.

[0025] Since the above technical scheme is adopted, the present application performs dust removal point position balancing control on the raw material conveying system, has outstanding dust removal effect. Moreover, the present application also uses the control method, can achieve on-demand dust removal, process energy saving purposes, and effectively solves the problems of uneven air distribution of the dust removal system, full power work and the like. The present application is suitable for raw material conveying of the steel industry, blast furnace ore bin dust removal, post-furnace dust removal, converter underground bin dust removal, converter raw and auxiliary material dust removal, sintered product dust removal, finishing dust removal, automobile material receiving dust removal and the like, the actual application energy saving amount is higher than 30%. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0028] Reference numerals: Raw material conveying device 100; Discharging device 200; Hopper 210; First vibrating screen 220; Weighing hopper 230; Second vibrating screen 240; Negative pressure dust removal device 300; First dust removal pipeline 310; First dust removal branch 311; Second dust removal pipeline 320; Second dust removal branch 321; Negative pressure dust removal source 330; Fan 331; Dust collector 332; First regulating device 411; Second regulating device 412; Third regulating device 413; First pressure device 421; Second pressure device 422; First flow device 431; Second flow device 432. Detailed Implementation

[0029] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0030] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0031] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] See Figure 1 The dust removal system of the conveying device shown cooperates with the raw material conveying device 100. In this embodiment, the raw material conveying device 100 includes a belt conveyor, which is existing technology. The dust removal system of the conveying device includes several unloading devices 200 and a negative pressure dust removal device 300.

[0033] A plurality of discharging devices 200 are arranged above the raw material conveying device 100 in the conveying direction, and there are six discharging devices 200 in the embodiment. Each discharging device 200 comprises, from top to bottom, a hopper 210, a first vibrating screen 220, a weighing bucket 230, and a second vibrating screen 240. In operation, the raw material falls into the first vibrating screen 220 through the hopper 210, is discharged and sieved by the first vibrating screen 220, and then falls into the weighing bucket 230. When the weighing bucket 230 displays a certain weight, the first vibrating screen 220 stops running, and the second vibrating screen 240 starts to operate to shake the raw material in the weighing bucket 230 into the raw material conveying device 100 for conveying.

[0034] The negative pressure dust removal device 300 comprises a first dust removal pipeline 310 and a second dust removal pipeline 320. One end of the first dust removal pipeline 310 is connected with a negative pressure dust removal source 330, and the other end is provided with a plurality of first dust removal branches 311. In the embodiment, the negative pressure dust removal source 330 comprises a fan 331 and a dust collector 332. The fan 331 is connected with a frequency converter to realize flexible speed regulation of the fan. Each first dust removal branch 311 corresponds to the first vibrating screen 220 and the second vibrating screen 240 of the same discharging device 200, and is used to absorb dust generated by the vibration of the first vibrating screen 220 and the second vibrating screen 240 by negative pressure. Preferably, the front end of the first dust removal branch 311 is provided with a negative pressure dust suction port. The first adjusting device 411 and the first pressure device 421 are arranged on each first dust removal branch 311, and the second adjusting device 412 and the first flow device 431 are arranged on the first dust removal pipeline 310.

[0035] The other end of the second dust removal pipeline 320 is provided with a plurality of second dust removal branches 321, which are arranged at intervals in the conveying direction at the bottom of the raw material conveying device 100. The position of each second dust removal branch 321 in the vertical direction corresponds to the position of one discharging device 200. The second flow device 432 is arranged on the second dust removal pipeline 320, and the third adjusting device 413 and the second pressure device 422 are arranged on each second dust removal branch 321. Preferably, the front end of the second dust removal branch 321 is provided with a negative pressure dust suction port. Each discharging device 200 is equipped with a first dust removal branch 311 for dust removal, and the corresponding position below is provided with a second dust removal branch 321 for dust removal, forming an up-down orientation dust removal, which improves the dust removal effect.

[0036] In this embodiment, the first adjusting device 411, the second adjusting device 412 and the third adjusting device 413 respectively comprise a first adjusting valve, a second adjusting valve and a third adjusting valve, the first pressure device 421 and the second pressure device 422 respectively comprise a first pressure gauge and a second pressure gauge, and the first flow device 431 and the second flow device 432 respectively comprise a first differential pressure flowmeter and a second differential pressure flowmeter. The adjusting valve is preferably a pneumatic adjusting valve, and of course, the adjusting valve can be replaced by an adjusting baffle and a pneumatic cut-off valve, which has a faster switching speed, is less likely to produce dust raising, and can be determined according to actual working conditions.

[0037] The dust removal method of the conveying device utilizes the dust removal system of the conveying device described above, and comprises the following method:

[0038] When the first pressure device 421 detects that the pressure of the multiple workstations is uneven, the first adjusting device 411 is adjusted.

[0039] The total flow rate of the control system is not less than N1m / s, and therefore, in the above-mentioned vibration screen start-stop control logic of the corresponding dust removal work position valve, the first adjusting device 411 of the corresponding dust removal work position is opened when the vibration screen is in action, but when the vibration screen stops action, the vibration screen is closed one by one under the premise that the flow rate is not less than N1m / s, and when the flow rate measured by the first flow device 411 is less than N1m / s+0.5m / s, the valve stops closing.

[0040] When the flow rate detected by the first flow device 431 is higher than N2m / s, the second adjusting device 412 is appropriately closed by 1% every T1 seconds until the flow rate reaches N3m / s, and the second adjusting device 412 stops action.

[0041] After the flow rate of the first flow device 431 is controlled to be normal, it is observed whether the flow rate displayed by the second flow device 432 exceeds N1m / s, and if it exceeds N1m / s, the fan speed is reduced by N4 revolutions / second, and after the speed is reduced, it is observed whether the flow rate displayed by the second flow device 432 is lower than N1m / s after a delay of T2 minutes, and if it is lower, the speed is maintained, and if it is still higher, the speed is continuously reduced.

[0042] After the flow rate of the first flow device 431 is controlled to be normal, it is observed whether the flow rate displayed by the second flow device 432 is lower than N5m / s, and if it is lower, the fan speed needs to be increased, and after the speed is increased, it is observed whether the flow rate displayed by the second flow device 432 is higher than N5m / s after a delay of T3 minutes, and if it is higher, the speed is maintained, and if it is still lower, the speed is continuously increased. During the speed increasing process, the second adjusting device 412 is appropriately closed by 1% every T4 seconds until the flow rate reaches N3m / s, and the valve stops action.

[0043] In this embodiment, N1=17, N2=18.5, N3=18, N4=50, N5=15, T1=10, T2=1, T3=1, T4=10, and of course can be adjusted according to different working conditions.

[0044] The third adjusting device 413 is used for pressure balance adjustment of the lower dust removal station of the raw material conveying device 100, after the maintenance is completed, the second adjusting device 412 is closed, the fan is controlled under the condition of 500 revolutions (the rated revolution of the fan is 750 revolutions), the opening of the third adjusting device 413 is adjusted, and the pressure value of the second pressure device 422 of each station point is ensured to be maintained in a certain range, mainly-350 to-450 Pa.

[0045] The present application aims at balancing control of dust removal points of a raw material conveying system, has outstanding dust removal effect. Moreover, the present application also uses a control method, can achieve dust removal on demand, process energy saving purposes, and effectively solves the problems of uneven air distribution of the dust removal system, full power work and the like. The present application is suitable for raw material conveying of the steel industry, blast furnace ore chute dust removal, post-furnace dust removal, underground stock bin dust removal of the converter, raw and auxiliary material dust removal of the converter, sintered product dust removal, finishing dust removal, automobile material receiving dust removal and the like, and the actual application energy saving amount is higher than 30%.

[0046] The following embodiment: the dust removal of the ore chute of the No. 1 blast furnace of the Shougang Qianjiang Iron and Steel Co., Ltd. is controlled by using the method of the present application: the effect of the transformation is as follows:

[0047]

[0048] Unless specifically stated otherwise, the relative arrangements of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the application. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship for the convenience of description. The technology, methods and equipment known to those skilled in the related art can not be discussed in detail, but under appropriate circumstances, the technology, methods and equipment should be regarded as part of the authorized description. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0049] In the description of the application, it should be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0050] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0051] The basic principles and main features of the present application and the advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, the above examples and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A dust removal system for a conveying device, characterized in that, In conjunction with the raw material conveying device, including: A plurality of feeding devices are arranged at intervals above the raw material conveying device along the conveying direction. Each feeding device includes, from top to bottom, a hopper, a first vibrating screen, a weighing hopper, and a second vibrating screen. A negative pressure dust removal device includes a first dust removal pipeline and a second dust removal pipeline. One end of the first dust removal pipeline is connected to a negative pressure dust removal source, and the other end is provided with a plurality of first dust removal branches. Each first dust removal branch corresponds to the first vibrating screen and the second vibrating screen of the same feeding device. Each first dust removal branch is provided with a first regulating device and a first pressure device. The first dust removal pipeline is provided with a second regulating device and a first flow device. One end of the second dust removal pipeline is connected to the negative pressure dust removal source, and the other end is provided with a plurality of second dust removal branches. The plurality of second dust removal branches are arranged at intervals along the conveying direction at the bottom of the raw material conveying device. The vertical position of each second dust removal branch corresponds to the position of a feeding device. The second dust removal pipeline is provided with a second flow device. Each second dust removal branch is provided with a third regulating device and a second pressure device. The dust removal method of the dust removal system of the conveying device includes the following methods: When multiple first vibrating screens and second vibrating screens are combined to feed materials, the first adjustment device at the corresponding dust removal point will perform the corresponding switching action. When the first pressure device detects that the pressure at multiple workstations is uneven, the first adjustment device will be used to make adjustments. The total flow velocity of the control system is not less than N1m / s. Therefore, the start-stop control logic of the corresponding dust removal station valve for the first or second vibrating screen is as follows: when the first or second vibrating screen is activated, the first regulating device of the corresponding dust removal station is opened. However, after the first or second vibrating screen stops, under the premise of ensuring that the flow velocity is not less than N1m / s, the first or second vibrating screen is closed one by one. When the flow velocity measured in the first flow device is <N1m / s+0.5m / s, the valve stops closing. When the flow velocity detected by the first flow device is higher than N2m / s, the second regulating device is appropriately closed, closing by 1% every T1 seconds, until the flow velocity reaches N3m / s, at which point the second regulating device stops operating. After the flow rate of the first flow device is controlled to be normal, observe whether the flow rate displayed by the second flow device exceeds N1m / s. If it exceeds N1m / s, reduce the fan speed by N4 revolutions / time. After the speed is reduced, delay for T2 minutes and observe whether the flow rate displayed by the second flow device is lower than N1m / s. If it is lower, maintain the speed. If it is still higher, continue to reduce the speed. After the flow rate of the first flow control device is normal, observe whether the flow rate displayed by the second flow control device is lower than N5m / s. If so, the fan speed needs to be increased. After the speed increases, wait for T3 minutes and observe whether the flow rate displayed by the second flow control device is higher than N5m / s. If it is higher, maintain the speed. If it is still lower, continue to increase the speed. During the speed increase, the second regulating device is closed appropriately, closing 1% every T4 seconds, until the flow rate reaches N3m / s, at which point the valve stops operating.

2. The dust removal system of the conveying device according to claim 1, characterized in that, The negative pressure dust removal source includes a fan and a dust collector.

3. The dust removal system of the conveying device according to claim 1, characterized in that, Negative pressure dust suction ports are provided at the front ends of the first and second dust removal branches.

4. The dust removal system of the conveying device according to claim 1, characterized in that, The raw material conveying device includes a belt conveyor.

5. The dust removal system of the conveying device according to claim 1, characterized in that, The first regulating device, the second regulating device, and the third regulating device each include a first regulating valve, a second regulating valve, and a third regulating valve, respectively.

6. The dust removal system of the conveying device according to claim 1, characterized in that, The first pressure device and the second pressure device each include a first pressure gauge and a second pressure gauge.

7. The dust removal system of the conveying device according to claim 1, characterized in that, The first flow device and the second flow device respectively include a first differential pressure flow meter and a second differential pressure flow meter.

8. The dust removal system of the conveying device according to claim 1, characterized in that, Including the following methods: After the maintenance is completed, the second regulating device is turned off, and the fan is adjusted at 500 rpm to ensure that the pressure value of the second pressure device at each work station is maintained within a certain range of -350 to -450 Pa.

9. The dust removal system of the conveying device according to claim 1, characterized in that, N1=17, N2=18.5, N3=18, N4=50, N5=15, T1=10, T2=1, T3=1, T4=10.

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