Dust removal equipment and dust removal method for grain dryer

Abstract

The present application discloses a grain dryer dust removal equipment, comprising: a dust removal device connected to the grain dryer, the dust removal device has a main body part, the top of the main body part is connected to the air suction fan and the bottom is connected to the grain dryer, the middle part of the main body part is a dust removal part, the dust removal part has a plurality of through holes, a filter part is installed in the through hole, a pulse part is installed above the filter part, a opening and closing structure is arranged below the filter part for opening and closing the bottom opening of the filter part, the filter part is closed for a preset time after the pulse part sprays high pressure air to make the filter part store high pressure air for a preset time, and the filter part comprises a dust removal cloth bag installed in the through hole. The above structure realizes high pressure vibration of the dust removal cloth bag, prolongs the storage time of high pressure air in the dust removal cloth bag through the closing mode, avoids blockage of the dust removal cloth bag, and improves the filtering efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of dust removal in grain dryers, specifically to dust removal equipment and methods for grain dryers. Background Technology

[0002] With increasing environmental awareness, there are certain requirements for the overall environment of grain drying. Existing grain drying methods must not only consider the drying effect, but also the subsequent dust pollution problem. Since the grain harvesting method is mainly mechanical harvesting, impurities such as rice husks, straw and soil will exist on the surface of the grain. During the grain drying process, most of the particulate dust on the surface of the grain will detach from the grain and come out through the gaps in the grain drying equipment. Common grain drying methods include natural sedimentation, spraying, cyclone dust collectors and bag dust collectors.

[0003] Natural settling, also known as inertial dust collection, involves colliding the dust-laden airflow with a baffle or abruptly changing its direction, using the inertial force of the dust particles to separate and trap them. This dust collection method has a simple structure, low resistance, and relatively low dust collection efficiency, and is generally used for primary dust collection. Currently, natural settling is more commonly used in areas with less stringent dust collection requirements and where low-temperature circulating grain dryers are used.

[0004] Spraying, also known as gravity spraying, is the simplest form of wet dust removal. It uses water droplets to wash the dust-laden gas, causing dust particles to adhere, agglomerate, and then separate from the airflow. This type of dust removal equipment is highly efficient, simple in structure, and safe to operate. However, it requires the treatment of the wastewater and sludge left after washing. In hot summer weather, failure to promptly clean up the wastewater and sludge can easily breed harmful flies and mosquitoes. If purifying corrosive gaseous pollutants, pipes and equipment are prone to corrosion and freezing in cold regions, resulting in higher operating costs. Improper handling can also easily lead to secondary pollution.

[0005] Cyclone dust collectors, also known as centrifugal dust collectors, are dry purification and dust removal devices that use the inertial centrifugal force of rotating airflow to separate dust from the air. The disadvantage is that the centrifugal force and collection efficiency are related to the density of dust particles. The lower the density, the more difficult it is to separate. For air with low dust particle density, the dust removal efficiency of cyclone dust collectors becomes low, so as not to meet the dust removal standards, and they are not suitable for grain drying.

[0006] Baghouse dust collection is a dust removal method that removes dust particles from dust-laden gas by passing it through filter bags. It includes several forms such as pulse jet dust collection and manual (electric) simple baghouse dust collection. Its advantages are: firstly, high dust removal efficiency, generally exceeding 99% for micron or nanometer-sized dust particles; secondly, a wide range of gas volumes it can handle; and thirdly, strong adaptability, simple structure, flexible use, and reliable operating costs. Its disadvantages are that it is not suitable for handling dust-laden gases with strong adhesion and hygroscopicity. Currently, baghouse dust collection offers relatively high cost-effectiveness and is highly recommended for areas with high environmental requirements, and it is also the preferred dust removal method for grain dryers.

[0007] After a period of operation, existing baghouse dust collectors accumulate dust on the surface of the filter bags, causing blockage and reduced filtration efficiency. Therefore, it is necessary to regularly clean the dust from the filter bags. The common method is to regularly clean the filter bags by injecting high-pressure air. However, because the pressure inside the filter bags in the baghouse dust collector structure used in grain dryers is low, and the suction fan and air inlet are always open, the internal pressure of the filter bags cannot easily rise. The vibration effect of the filter bags is limited under low pressure, and the dust accumulated on the filter bags cannot be fully vibrated, resulting in limited removal effect. To address these issues, we have improved the existing baghouse dust collector structure used in grain dryers and designed a dust removal device and method for grain dryers. Summary of the Invention

[0008] To address the problems existing in the prior art, one objective of this invention is to provide a dust removal device for a grain dryer, which enables high-pressure vibration of the dust collector bag and extends the storage time of high-pressure air in the dust collector bag through a closed mechanism, thereby preventing the dust collector bag from clogging and improving filtration efficiency. Another objective of this invention is to provide a dust removal method for a grain dryer, so as to fully realize the dust removal work of the grain dryer.

[0009] To achieve the above objectives, the dust removal equipment for the grain dryer used in this invention includes:

[0010] A dust removal device connected to the grain dryer draws in dust and separates it to discharge the separated air into the outside air;

[0011] The aforementioned dust removal device has a main body, the top of which is connected to a suction fan and the bottom to a grain dryer. The bottom of the main body is a collection funnel and the middle is a dust removal section. The dust removal section has multiple cylindrical through holes, and filter elements for filtering dust are installed in the through holes. A pulse section is installed above the filter element to spray high-pressure air from above the filter element to below the filter element. The filter element is provided with an opening and closing structure for opening and closing the bottom opening of the filter element. After the pulse section sprays high-pressure air, the filter element closes for a preset time to store high-pressure air for a preset time. The filter element includes a dust collection bag installed in the through holes.

[0012] The above structure enables high-pressure vibration of the dust collector bag and extends the storage time of high-pressure air inside the dust collector bag through a closed mechanism, thereby preventing the dust collector bag from clogging and improving filtration efficiency.

[0013] To ensure the declogging of the dust collector bags during dust removal operations, the aforementioned pulse section includes a dynamic pulse base mounted on the top of the main body. This dynamic pulse base is equipped with high-pressure pulse nozzles corresponding to the number and position of the filter components, allowing each high-pressure pulse nozzle to independently spray the corresponding filter component. This structure enables independent declogging of the dust collector bags. During actual operation, the high-pressure pulse nozzles can be controlled to operate intermittently via a control structure. For example, while some high-pressure pulse nozzles are operating, the remaining high-pressure pulse nozzles stop working, but the filter components corresponding to these remaining high-pressure pulse nozzles remain connected, allowing high-pressure air to pass through them, thus achieving the declogging of the dust collector bags during dust removal operations.

[0014] To achieve the purpose of opening and closing the aforementioned dust collector bag, the present invention adopts the following measures: an opening and closing structure is installed on the side of the dust collector bag away from the pressure-holding pulse nozzle, detailed as follows:

[0015] The opening and closing structure includes a drive device arranged below the filter component. The opening and closing plate is driven by the drive device to open and close along the bottom opening of the filter component. The size of the opening and closing plate is larger than the size of the bottom opening of the filter component. The bottom opening of the filter component is provided with a limiting block to limit the movement position of the opening and closing plate.

[0016] Furthermore, the present invention is a dust removal device for a grain dryer, wherein the dust collector bag is divided into three parts along the straight direction of the through hole. Taking the through hole structure as an example, the through hole includes a first section at the top, a second section in the middle, and a third section at the tail. The first and third sections are interference fits with the filter element, while the second section is clearance fits with the filter element so that when high-pressure air is introduced into the filter element, it shakes in the second section, making the middle part of the dust collector bag loose. After high-pressure air is introduced into the dust collector bag, especially after the air outlet of the dust collector bag is closed, a large amount of high-pressure air accumulates in the middle section of the dust collector bag and drives the dust collector bag to shake. The shaking is particularly violent in the loose middle section, which effectively removes dust from the inner wall of the dust collector bag. At the same time, considering that the middle part of the filter element shakes frequently and comes into frequent contact with the inner wall of the through hole, which can easily lead to wear of the filter element, i.e., the middle part of the dust collector bag, the present invention provides a wear-resistant sleeve on the outer side of the second section of the filter element.

[0017] As a further optimization of the above solution, in existing cylindrical dust collector bags, the non-conical structure of the dust collector bag will cause vibration due to uneven airflow velocity. In particular, the operation of closing the air outlet for a preset time used in this invention will prolong the vibration time of the dust collector bag. However, by designing the dust collector bag with a structure where the cross-sectional area is uneven along the circumference in a straight line, under pressure, some parts of the dust collector bag will have a higher speed, causing the dust collector bag to vibrate. For example, the size of the filter component in the third section gradually decreases from top to bottom to form a conical structure to compress the high-pressure air falling from the top. That is, the structure of the dust collector bag is designed as a conical structure in the third section. This structure will make the part near the bottom opening have varying dimensions, strengthen the pressure of the high-pressure air in the third section, and allow the high-pressure air to return a longer distance while prolonging the time the high-pressure air stays in the dust collector bag. In addition, this structure will reduce the size of the bottom opening of the dust collector bag, making it easier to install the opening and closing structure at the bottom of the dust collector bag.

[0018] As a further optimization of the above solution, we will install the dust removal equipment of the grain dryer shown in any of the above technical solutions on the existing grain dryer structure to optimize the dust removal effect of the existing grain dryer.

[0019] The dust removal method for grain dryers, which implements the dust removal equipment for grain dryers as described in any of the above technical solutions, optimizes the high-pressure vibration effect of the dust collector bags compared to the existing dust removal effect of grain dryers. By using a closed mechanism, it extends the storage time of high-pressure air in the dust collector bags, avoids clogging of the dust collector bags, and improves filtration efficiency, especially for bag-type dust collection structures.

[0020] The dust removal equipment and method for grain dryers of the present invention have the following beneficial effects:

[0021] 1. The dust removal equipment and method for grain dryers of the present invention realizes high-pressure vibration of the dust removal bag, and extends the storage time of high-pressure air in the dust removal bag by means of a closed method, thereby avoiding clogging of the dust removal bag and improving filtration efficiency.

[0022] 2. The dust removal equipment and method for the grain dryer of the present invention, in order to ensure the declogging of the dust collector bags during dust removal, designs high-pressure pulse nozzles corresponding to the number and position of the filter components, so that the filter components corresponding to the independent spray positions of the high-pressure pulse nozzles can be used. The above structure realizes the independent declogging of the dust collector bags. In actual operation, the high-pressure pulse nozzles are controlled to work intermittently by the control structure. For example, when some high-pressure pulse nozzles are working, the other high-pressure pulse nozzles stop working. The filter components corresponding to the other high-pressure pulse nozzles are still in a connected state, and high-pressure air can pass through the filter components to realize the declogging of the dust collector bags during dust removal.

[0023] 3. The dust removal equipment and method for the grain dryer of the present invention are designed with a gap fit between the second section of the through hole and the filter component, so that after high-pressure air is introduced into the filter component, it shakes in the second section, making the middle part of the dust removal bag loose. After high-pressure air is introduced into the dust removal bag, especially after the air outlet of the dust removal bag is closed, a large amount of high-pressure air accumulates in the middle section of the dust removal bag and drives the dust removal bag to shake. The shaking is particularly violent in the loose middle part, which effectively removes the dust on the inner wall of the dust removal bag. At the same time, considering that the middle part of the filter component shakes frequently and comes into frequent contact with the inner wall of the through hole, which can easily lead to wear of the filter component, i.e., the middle part of the dust removal bag, the present invention provides a wear-resistant sleeve on the outer side of the second section of the filter component.

[0024] 4. The dust removal equipment and method for grain dryers of the present invention optimizes the high-pressure vibration effect of the dust collector bag compared with the existing dust removal effect of grain dryers, and extends the storage time of high-pressure air in the dust collector bag by means of a closed method, thereby avoiding clogging of the dust collector bag and improving filtration efficiency, especially for bag dust removal structures.

[0025] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope as a result, and the embodiments of the present invention include many changes, modifications and equivalents. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a dust removal device for a grain dryer.

[0027] Figure 2This is a schematic diagram of the dust removal device in this invention;

[0028] Figure 3 This is a schematic diagram of the main body of the present invention;

[0029] Figure 4 This is a schematic diagram of the limiting block in this invention;

[0030] Figure 5 This is a schematic diagram of the opening and closing part in this invention;

[0031] Figure 6 This is a schematic diagram of the structure of the second segment in this invention;

[0032] Figure 7 This is a schematic diagram of the wear-resistant sleeve in this invention;

[0033] Figure 8 This is a schematic diagram of the conical structure in this invention.

[0034] In the diagram: 1. Grain dryer; 2. Dust removal device; 3. Fan; 4. Filter component; 5. Pulse section; 6. Opening and closing structure; 7. Conical structure; 21. Main body; 22. Through hole; 41. Limiting block; 42. Wear-resistant sleeve; 51. Dynamic pulse base; 52. High-pressure pulse nozzle; 61. Drive device; 62. Opening and closing plate; 211. Collection funnel; 212. Dust removal section; 221. First section; 222. Second section; 223. Third section. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0036] It should be noted that when an element is referred to as "set on" or "provided with" another element, it can be directly on the other element or there may be an intermediate element. When an element is referred to as "connected to" or "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. "Fixed connection" means fixed connection. There are many ways of fixed connection, which are not within the scope of protection of this document. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in the specification herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] Please see the appendix Figure 1-8 We provide a specific embodiment of a dust removal device for a grain dryer. In this embodiment, a dust removal device 2 is connected to the grain dryer 1. Dust is drawn in and separated from the dust removal device 2, and the separated air is discharged into the outside air. The dust removal device 2 has a main body 21, which is vertically arranged with a suction section, a dust removal section 212, a dust inlet section, and a collection funnel 211. The suction section is located at the top of the main body 21 and connected to a suction fan 3. The dust inlet section is located in the lower middle part of the main body 21 and connected to the grain dryer 1 to absorb dust inside the grain dryer. Below the dust inlet section is a collection funnel so that large particles of impurities drawn into the grain dryer, such as soil and accidentally introduced grain particles, fall into the collection funnel 211 after passing through the dust removal section. See detailed reference... Figure 2 In this embodiment, the dust removal section 212 has a cylindrical through-hole structure. A filter element 4 for filtering dust is installed inside the through-hole 22. Specifically, in this embodiment, the filter element 4 is a dust collector bag. For details, please refer to [reference needed]. Figure 3 In this embodiment, a pulse section 5 is installed above the filter component 4 to spray high-pressure air from above the filter component 4 to below the filter component 4. The filter component 4 is provided with an opening and closing structure 6 for opening and closing the bottom opening of the filter component 4. After the pulse section 5 sprays high-pressure air, the filter component 4 closes for a preset time to store high-pressure air for a preset time.

[0039] The above structure enables high-pressure vibration of the dust collector bag and extends the storage time of high-pressure air inside the dust collector bag through a closed mechanism, thereby preventing the dust collector bag from clogging and improving filtration efficiency.

[0040] To achieve the purpose of opening and closing the aforementioned dust collector bags, the present invention adopts the following measures:

[0041] The opening and closing structure 6 includes a drive device 61 arranged below the filter component 4. The opening and closing plate 62 is driven by the drive device 61 to open and close along the bottom opening of the filter component 4. The size of the opening and closing plate 62 is larger than the size of the bottom opening of the filter component 4. The bottom opening of the filter component 4 is provided with a limiting block 42 to limit the movement of the opening and closing plate 62.

[0042] In detail, the structure of the opening and closing structure 6 in this embodiment is as follows: Figure 4 As shown, in Figure 4 The aforementioned driving device includes a cylinder, a pneumatic actuator, a movable frame, and an opening / closing plate 62. The cylinder is located in the middle of the main body 21. The pneumatic actuator is located at the output end of the cylinder and is driven by the cylinder to move in a straight line. The movable frame is located on the pneumatic actuator and moves with it. The opening / closing plate 62 is located within the movable frame and is positioned with a certain gap. The size of this gap is larger than the size of the bottom opening of the filter component 4, so that the filter component can be ventilated after the bottom opening of the filter component 4 is aligned with the gap. After the opening / closing plate 62 is vertically aligned with the filter component 4, the opening / closing plate 62 closes the bottom opening of the filter component 4.

[0043] As another embodiment of the above solution, in order to ensure the declogging of the dust collector bag during dust removal, the pulse section 5 includes a moving pulse base 51 installed on the top of the main body 21. The moving pulse base 51 is provided with high-pressure pulse nozzles 52 corresponding to the number and position of the filter components 4, so that the high-pressure pulse nozzles 52 can independently spray the filter components 4 corresponding to their positions. The above structure realizes the independent declogging of the dust collector bag. In actual operation, the high-pressure pulse nozzles 52 can be controlled to work intermittently by the control structure. For example, when some high-pressure pulse nozzles 52 are working, the other high-pressure pulse nozzles 52 stop working. The filter components 4 corresponding to the other high-pressure pulse nozzles 52 are still in a connected state, and high-pressure air can pass through the filter components to realize the declogging of the dust collector bag during dust removal.

[0044] In detail, the technical solution of the other embodiment described above differs from that described above. Figure 4 The opening and closing structure 6 shown in this technical solution corresponds to the number of filter components 4 and is independent of each other. See reference [link / reference needed] for details. Figure 5 In this embodiment, the opening and closing structure 6 has an independent driving device 61 and an opening and closing plate 62. In this structure, the opening and closing plate 62 is directly connected to the cylinder through a pneumatic push rod and can independently perform opening and closing operations.

[0045] Furthermore, such as Figure 6 as well as Figure 7As shown, this invention is a dust removal device for a grain dryer. The dust collector bag is divided into three parts along the straight direction of the through-hole. Taking the through-hole structure as an example, the through-hole 22 includes a first section 221 at the top, a second section 222 in the middle, and a third section 223 at the tail. The first section 221 and the third section 223 are both interference-fitted with the filter element 4, while the second section 222 is clearance-fitted with the filter element 4 so that when high-pressure air is introduced into the filter element 4, it shakes in the second section 222, causing the middle part of the dust collector bag to be loose. After high-pressure air is introduced into the dust collector bag, especially after the air outlet of the dust collector bag is closed, a large amount of high-pressure air accumulates in the middle section of the dust collector bag and drives the dust collector bag to shake. The shaking is particularly violent in the loose middle section, which effectively removes the dust on the inner wall of the dust collector bag. At the same time, considering that the middle section of the filter component shakes frequently and comes into frequent contact with the inner wall of the through hole, which can easily lead to wear of the filter component, i.e., the middle section of the dust collector bag, the present invention provides a wear-resistant sleeve 42 on the outer side of the second section 222 of the filter component 4.

[0046] Furthermore, in existing cylindrical dust collector bags, the non-conical structure of the dust collector bag can cause vibration due to uneven airflow velocity. In particular, the operation of closing the air outlet for a preset time, as used in this invention, prolongs the vibration time of the dust collector bag. However, designing the dust collector bag with a non-uniform circumferential cross-sectional area along a straight direction will cause some parts of the dust collector bag to vibrate at higher speeds under pressure. For example… Figure 8 As shown in the structure, in this embodiment, the size of the filter component 4 in the third section 223 gradually decreases from top to bottom to form a conical structure to compress the high-pressure air falling from the top. That is, the structure designs the dust collector bag in the third section as a conical structure. This structure will make the part near the bottom opening have a different size, which will increase the pressure of the high-pressure air in the third section 223. This will allow the high-pressure air to return a longer distance and prolong the time the high-pressure air stays in the dust collector bag. In addition, this structure will reduce the size of the bottom opening of the dust collector bag, making it easier to install the opening and closing structure at the bottom of the dust collector bag.

[0047] For detailed reference Figure 1 This embodiment presents a schematic diagram illustrating the structure of installing the dust removal equipment of the grain dryer on the grain dryer. Figure 1 In this process, the dust removal equipment for the grain dryer is installed on top of the grain dryer and uses a negative pressure structure to extract dust from inside the grain dryer.

[0048] The dust removal method for a grain dryer provided in this embodiment implements the dust removal equipment for a grain dryer as described in any of the above technical solutions. Compared with the existing dust removal effect of grain dryers, this method optimizes the high-pressure vibration effect of the dust collector bag and extends the storage time of high-pressure air in the dust collector bag through a closed mechanism, thereby avoiding clogging of the dust collector bag and improving filtration efficiency, especially for bag-type dust collection structures.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dust removal device for a grain dryer, characterized in that, include: A dust removal device (2) is connected to the grain dryer (1). Dust is drawn in and separated from the dust removal device (2) to discharge the separated air into the outside air. The dust removal device (2) has a main body (21), the top of which is connected to a suction fan (3) and the bottom of which is connected to a grain dryer (1). The bottom of the main body (21) is a collection funnel (211) and the middle part is a dust removal part (212). The dust removal part (212) has multiple cylindrical through holes (22). A filter element (4) for filtering dust is installed in the through holes (22). A pulse part (5) is installed above the filter element (4) to spray high-pressure air from above the filter element (4) to below the filter element (4). An opening and closing structure (6) for opening and closing the bottom opening of the filter element (4) is provided below the filter element (4). After the pulse part (5) sprays high-pressure air, the filter element (4) closes for a preset time so that the filter element (4) stores high-pressure air for a preset time. The aforementioned through hole (22) includes a first section (221) at the top, a second section (222) in the middle, and a third section (223) at the tail. The first section (221) and the third section (223) are both interference fits with the filter element (4), while the second section (222) is clearance fits with the filter element (4) so ​​that when high-pressure air is introduced into the filter element (4), it shakes in the second section (222). The dimensions of the filter element (4) in the third section (223) gradually decrease from top to bottom to form a conical structure (7) to compress the high-pressure air falling from the top; The pulse section (5) includes a dynamic pulse base (51) mounted on the top of the main body (21). The dynamic pulse base (51) is provided with high-pressure pulse nozzles (52) that correspond in number and position to the filter components (4) so ​​that the high-pressure pulse nozzles (52) can independently spray the filter components (4) corresponding to the position. The opening and closing structure (6) includes a drive device (61) arranged below the filter component (4), and the opening and closing plate (62) is driven by the drive device (61) to open and close along the bottom opening of the filter component (4), and the size of the opening and closing plate (62) is larger than the size of the bottom opening of the filter component (4).

2. The dust removal equipment for a grain dryer according to claim 1, characterized in that: The aforementioned filter element (4) includes a dust collection bag installed in the through hole (22).

3. The dust removal equipment for a grain dryer according to claim 2, characterized in that: The bottom opening of the filter component (4) is provided with a limiting block (41) for the movement of the limiting opening and closing plate (62).

4. The dust removal equipment for a grain dryer according to claim 3, characterized in that: The aforementioned filter component (4) has a wear-resistant sleeve (42) fitted on the outer side of a portion of the second section (222).

5. A grain dryer, characterized in that: The grain dryer has a grain dryer dust removal device as shown in any one of claims 1-4 above.

6. A dust removal method for a grain dryer, characterized in that: Use the dust removal equipment for the grain dryer as described in any one of claims 1-4.

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