Dust removal system and dust removal method of conveying device

Abstract

The dust removal system is matched with a raw material conveying device and comprises a plurality of discharging devices arranged above the raw material conveying device at intervals in the conveying direction, and each discharging device sequentially comprises a stock bin, a first vibrating screen, a weighing hopper and a second vibrating screen from top to bottom; 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, and 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, the second dust removal branches are arranged at the bottom of the raw material conveying device at intervals 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 invention further discloses a dust removal method of the conveying device.

Description

Technical Field

[0001] The present invention relates to the technical field of dust removal devices, and in particular to a dust removal system and a dust removal method for a conveying device. Background Art

[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 steel raw materials to the conveying of raw materials on belt conveyors, and finally to production equipment, steel raw material conveyors are widely used in steel plants, mines, coal and other industries to convey bulk materials such as coal, ore, sand and gravel. In the steel production process, it can achieve continuous and stable conveying of raw materials and improve production efficiency.

[0003] At present, the raw material conveying device in the steel industry will generate a lot of dust when conveying materials, which leads to a poor environment in the whole workshop. Therefore, a dust removal system is needed, but the current dust removal system cannot remove dust well, or requires the dust removal equipment to work at full power all the time, which is less environmentally friendly. Summary of the invention

[0004] The object of the present invention is to provide a dust removal system and a dust removal method for a conveying device in view of the above-mentioned deficiencies and defects of the prior art, so as to solve the above-mentioned problems.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0006] The dust removal system of the conveying device, in conjunction with the raw material conveying device, includes:

[0007] A plurality of unloading devices are arranged above the raw material conveying device at intervals along the conveying direction, each of the unloading devices comprises a silo, a first vibrating screen, a weighing bucket, and a second vibrating screen in order from top to bottom;

[0008] A negative pressure dust removal device, the 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 unloading device, each first dust removal branch is provided with a first regulating device and a first pressure device, and 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 a negative pressure dust removal source, and the other end is provided with a plurality of second dust removal branches, and the plurality of second dust removal branches are arranged at intervals along the conveying direction at the bottom of the raw material conveying device, and the position of each second dust removal branch in the vertical direction corresponds to the position of a unloading device, the second dust removal pipeline is provided with a second flow device, and each second dust removal branch is provided with a third regulating device and a second pressure device.

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

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

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

[0012] In a preferred embodiment of the present invention, the first regulating device, the second regulating device and the third regulating device include a first regulating valve, a second regulating valve and a third regulating valve, respectively.

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

[0014] In a preferred embodiment of the present invention, the first flow device and the second flow device include a first differential pressure flow meter and a second differential pressure flow meter, respectively.

[0015] A dust removal method for a conveying device, using the dust removal system for the conveying device as described in any of the above technical solutions, includes the following method:

[0016] When multiple first vibrating screens and second vibrating screens are combined to unload materials respectively, the first regulating devices at the corresponding dust removal points perform corresponding switching actions. When the first pressure device detects that the pressure at multiple stations is uneven, the first regulating device is used to make adjustments.

[0017] The total flow rate of the control system is not less than N1m / s. Therefore, the start-stop control logic of the corresponding dust removal station valve of the vibrating screen is as follows: when the vibrating screen is in motion, the first regulating device of the corresponding dust removal station is opened. However, after the vibrating screen stops, the vibrating screens are closed one by one on the premise of ensuring that the flow rate is not less than N1m / s. When the flow rate measured in the first flow device is less than N1m / s+0.5m / s, the valve stops closing.

[0018] When the flow rate detected by the first flow device is higher than N2m / s, the second regulating device is appropriately closed by 1% every T1 seconds until the flow rate reaches N3m / s, and the second regulating device stops operating;

[0019] 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, the fan speed is reduced by N4 turns / times. After the speed is reduced, delay T2 minutes to observe whether the flow rate displayed by the second flow device is lower than N1m / s. If it is lower, the speed is maintained. If it is still higher, the speed is further reduced.

[0020] When the flow rate of the first flow device is controlled to be normal, and the flow rate displayed by the second flow device is observed to be lower than N5m / s, the fan speed needs to be increased. After the speed increases, a delay of T3 minutes is made to observe whether the flow rate displayed by the second flow device is higher than N5m / s. If it is higher, the speed is maintained. If it is still lower, the speed continues to increase. During the speed increase, the second regulating device is appropriately closed, closing 1% every T4 seconds until the flow rate reaches N3m / s and the valve stops operating.

[0021] In a preferred embodiment of the present invention, the following method is included:

[0022] After the inspection is completed, close the second regulating device, control the fan at 500 rpm, and make adjustments to ensure that the pressure value of the second pressure device at each work station is maintained within a certain range, mainly -350~

[0023] -450Pa.

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

[0025] Due to the adoption of the above technical solution, the present invention performs balanced control of dust removal points for the raw material conveying system, and has an outstanding dust removal effect. Moreover, the present invention also utilizes a control method to achieve the purpose of dust removal on demand and process energy saving, and effectively solves the problems of uneven air distribution and full power operation of the dust removal system. The present invention is suitable for raw material transportation, blast furnace ore hopper dust removal, post-furnace dust removal, converter underground silo dust removal, converter raw and auxiliary material dust removal, sintered finished product dust removal, finishing dust removal, automobile receiving dust removal, etc. in the steel industry, and the actual application energy saving is higher than 30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0028] Figure markings: raw material conveying device 100; unloading device 200; silo 210; first vibrating screen 220; weighing bucket 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 DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0030] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0031] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0032] See also Figure 1 The dust removal system of the conveying device shown is matched with the material conveying device 100. The material conveying device 100 in this embodiment includes a belt conveying device, which is a prior art. The dust removal system of the conveying device includes a plurality of unloading devices 200 and a negative pressure dust removal device 300.

[0033] Several unloading devices 200 are arranged above the raw material conveying device 100 at intervals along the conveying direction. In this embodiment, there are six unloading devices 200, and each unloading device 200 includes a silo 210, a first vibrating screen 220, a weighing bucket 230, and a second vibrating screen 240 from top to bottom. During operation, the raw material falls into the first vibrating screen 220 through the silo 210, and is unloaded and screened by the shaking of the first vibrating screen 220, and falls into the weighing bucket 230. After the weighing bucket 230 displays a certain weight, the first vibrating screen 220 stops running, and the second vibrating screen 240 starts to move, shaking 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 includes a first dust removal pipeline 310 and a second dust removal pipeline 320, one end of the first dust removal pipeline 310 is connected to a negative pressure dust removal source 330, and the other end is provided with a plurality of first dust removal branches 311. In this embodiment, the negative pressure dust removal source 330 includes a fan 331 and a dust collector 332, and the fan 331 is connected to a frequency converter to realize flexible adjustment of the fan speed. Each first dust removal branch 311 corresponds to the first vibrating screen 220 and the second vibrating screen 240 of the same unloading device 200, and the first dust removal branch 311 is used to absorb the dust generated by the vibration of the first vibrating screen 220 and the second vibrating screen 240 under negative pressure. Preferably, a negative pressure dust suction port is provided at the front end of the first dust removal branch 311. A first regulating device 411 and a first pressure device 421 are provided on each first dust removal branch 311, and a second regulating device 412 and a first flow device 431 are provided on the first dust removal pipeline 310.

[0035] One end of the second dust removal pipeline 320 is connected to the negative pressure dust removal source 330, and the other end is respectively provided with a plurality of second dust removal branches 321, which are arranged at intervals along the conveying direction at the bottom of the raw material conveying device 100, and the position of each second dust removal branch 321 in the vertical direction corresponds to the position of a feeding device 200. A second flow device 432 is provided on the second dust removal pipeline 320, and a third regulating device 413 and a second pressure device 422 are provided on each second dust removal branch 321. Preferably, a negative pressure dust suction port is provided at the front end of the second dust removal branch 321. A feeding device 200 itself is equipped with a first dust removal branch 311 for dust removal, and a second dust removal branch 321 is provided below its corresponding position for dust removal, forming upper and lower dust removal to improve the dust removal effect.

[0036] In this embodiment, the first regulating device 411, the second regulating device 412, and the third regulating device 413 include a first regulating valve, a second regulating valve, and a third regulating valve, respectively; the first pressure device 421 and the second pressure device 422 include a first pressure gauge and a second pressure gauge, respectively; the first flow device 431 and the second flow device 432 include a first differential pressure flow meter and a second differential pressure flow meter, respectively. The regulating valve is preferably a pneumatic regulating valve. Of course, the regulating valve can also be changed to a regulating baffle and a pneumatic shut-off valve, which has a faster switching speed and is not easy to generate dust. It can be determined according to actual working conditions.

[0037] A dust removal method for a conveying device, using the dust removal system of the conveying device, includes the following method:

[0038] When a plurality of first vibrating screens 220 and second vibrating screens 240 are combined to discharge materials respectively, the first regulating device 411 at the corresponding dust removal point performs corresponding switching actions. When the first pressure device 421 detects that the pressure at multiple stations is uneven, the first regulating device 411 is used to make adjustments;

[0039] The total flow rate of the control system is not less than N1m / s. Therefore, the start-stop control logic of the corresponding dust removal station valve of the vibrating screen is as follows: when the vibrating screen is in motion, the first regulating device 411 of the corresponding dust removal station is opened. However, after the vibrating screen stops, the vibrating screens are closed one by one on the premise of ensuring that the flow rate is not less than N1m / s. When the flow rate measured in 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 regulating device 412 is appropriately closed by 1% every T1 seconds until the flow rate reaches N3m / s, and the second regulating device 412 stops operating;

[0041] After controlling the flow rate of the first flow device 431 to be normal, observe whether the flow rate displayed by the second flow device 432 exceeds N1m / s. If it exceeds N1m / s, the fan speed is reduced by N4 turns / times. After the speed is reduced, delay T2 minutes to observe whether the flow rate displayed by the second flow device 432 is lower than N1m / s. If it is lower, the speed is maintained. If it is still higher, the speed is further reduced.

[0042] When the flow rate of the first flow device 431 is controlled to be normal, and the flow rate displayed by the second flow device 432 is observed to be lower than N5m / s, the fan speed needs to be increased. After the speed increases, a delay of T3 minutes is made to observe whether the flow rate displayed by the second flow device 432 is higher than N5m / s. If it is higher, the speed is maintained. If it is still lower, the speed continues to increase. During the speed increase, the second regulating device 412 is appropriately closed, closing 1% every T4 seconds until the flow rate reaches N3m / s and the valve stops moving.

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

[0044] The third regulating device 413 is used for pressure balance adjustment of the dust removal station at the bottom of the raw material conveying device 100. After the inspection is completed, the second regulating device 412 is closed, and the fan is controlled at 500 rpm (the rated speed of the fan is 750 rpm). The opening of the third regulating device 413 is adjusted to ensure that the pressure value of the second pressure device 422 of each work station is maintained within a certain range, mainly -350 to -450 Pa.

[0045] The present invention performs balanced control of dust removal points for the raw material conveying system, and has an outstanding dust removal effect. Moreover, the present invention also utilizes a control method to achieve the purpose of dust removal on demand and process energy saving, and effectively solves the problems of uneven air distribution and full power operation of the dust removal system. The present invention is suitable for raw material transportation, blast furnace ore hopper dust removal, post-furnace dust removal, converter underground silo dust removal, converter raw and auxiliary material dust removal, sintered finished product dust removal, finishing dust removal, automobile receiving dust removal, etc. in the steel industry, and the actual application energy saving is higher than 30%.

[0046] The following example: The dust removal of the ore trough of the No. 1 blast furnace of Shougang Qiangang adopts the method of the present invention for process control: The transformation effect:

[0047]

[0048] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0049] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0050] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0051] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A dust removal system for a conveying device, characterized in that: Cooperate with the material conveying device, including: A plurality of unloading devices are arranged above the raw material conveying device at intervals along the conveying direction, each of the unloading devices comprises a silo, a first vibrating screen, a weighing bucket, and a second vibrating screen in order from top to bottom; A negative pressure dust removal device, the 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 unloading device, each first dust removal branch is provided with a first regulating device and a first pressure device, and 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 a negative pressure dust removal source, and the other end is provided with a plurality of second dust removal branches, and the plurality of second dust removal branches are arranged at intervals along the conveying direction at the bottom of the raw material conveying device, and the position of each second dust removal branch in the vertical direction corresponds to the position of a unloading device, the second dust removal pipeline is provided with a second flow device, and each second dust removal branch is provided with a third regulating device and a second pressure device.

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 dust removal branch and the second dust removal branch.

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

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 respectively include a first regulating valve, a second regulating valve and a third regulating valve.

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 include a first pressure gauge and a second pressure gauge respectively.

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 include a first differential pressure flow meter and a second differential pressure flow meter respectively.

8. A dust removal method for a conveying device, characterized in that: A dust removal system using the conveying device according to any one of claims 1 to 7, comprising the following method: When multiple first vibrating screens and second vibrating screens are combined to unload materials respectively, the first regulating devices at the corresponding dust removal points perform corresponding switching actions. When the first pressure device detects that the pressure at multiple stations is uneven, the first regulating device is used to make adjustments. The total flow rate of the control system is not less than N1m / s. Therefore, the start-stop control logic of the corresponding dust removal station valve of the vibrating screen is as follows: when the vibrating screen is in motion, the first regulating device of the corresponding dust removal station is opened. However, after the vibrating screen stops, the vibrating screens are closed one by one on the premise of ensuring that the flow rate is not less than N1m / s. When the flow rate measured in the first flow device is less than N1m / s+0.5m / s, the valve stops closing. When the flow rate detected by the first flow device is higher than N2m / s, the second regulating device is appropriately closed by 1% every T1 seconds until the flow rate reaches N3m / s, and 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, the fan speed is reduced by N4 turns / times. After the speed is reduced, delay T2 minutes to observe whether the flow rate displayed by the second flow device is lower than N1m / s. If it is lower, the speed is maintained. If it is still higher, the speed is further reduced. When the flow rate of the first flow device is controlled to be normal, and the flow rate displayed by the second flow device is observed to be lower than N5m / s, the fan speed needs to be increased. After the speed increases, a delay of T3 minutes is made to observe whether the flow rate displayed by the second flow device is higher than N5m / s. If it is higher, the speed is maintained. If it is still lower, the speed continues to increase. During the speed increase, the second regulating device is appropriately closed, closing 1% every T4 seconds until the flow rate reaches N3m / s and the valve stops operating.

9. The dust removal method for a conveying device according to claim 8, characterized in that: The following methods are included: After the inspection is completed, close the second regulating device, control the fan at 500 rpm, and make adjustments to ensure that the pressure value of the second pressure device at each work station is maintained within a certain range, mainly -350 to -450 Pa.

10. The dust removal method for a conveying device according to claim 8, 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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