1 產品概述
1.1 Product Overview:
袋式除塵器是利用多孔的袋裝過濾元件從含塵氣體中捕集粉塵的一種除塵設備。主要由過濾裝置和清塵裝置兩個部分組成。前者的作用是捕集粉塵;后者則用以定期清除濾袋上的積塵,保持除塵器的處理能力。通常還設有清灰控制裝置,是除塵器按一定的時間間隔和程序清灰。
Bag filter is a kind of dust removal equipment that collects dust from dust-containing gas by means of porous bag filter element. It mainly consists of filter device and dust removal device. The former role is to catch dust; The latter is used to regularly eliminate the dust on the filter bag to maintain the processing capacity of the dust collector. Usually also has the ash control device, is the dust collector according to the certain time interval and the procedure ash clearance, generally thinks the bag type dust collector certain time interval and the procedure ash clearance.
1.2. 過濾材料對塵粒的捕集
1.2. Filter material's collection of dust particles.
這一過程中包括觀星碰撞效應、截留效應、擴散效應、靜電效應、篩濾效應、重力沉降效應。
一般粒徑較大的粉塵主要依碰效應捕集,當含塵氣流接近濾料的纖維時,秋柳流線圍繞捕集纖維迅速拐彎,其中較大的粒子由于慣性力的作用,偏離了流線,繼續沿著原來的運動方向前進,同捕集纖維發生碰撞而被捕集。慣性碰撞時過濾除塵的主要機制之一,而塵粒能否同捕集纖維發生碰撞主要取決于運動粒子所具有的慣性力于的大有小,為了的提高慣,性可碰撞效以應,可的以適當生提高通如過濾料果的氣流的流速。
對于具有一定尺寸直徑的塵粒，質量可以忽略的塵粒，如果依據流線把他們帶到距捕集纖維表面d/2以內的距離***會被捕集。
在氣流中對于粒徑小于1m的塵粒由于氣體分子的運動撞擊,使其產生布朗悅動。這種塵粒無規則的運動,除了可能產生塵粒之間的凝集外,還有向低濃度區擴散的趨勢。由于捕集纖維表面的濃度較低,所以小塵粒向著纖維表面擴散,并與纖維碰撞而被捕集。當過濾速度較高時,擴散效應***會下降。
有許多人造纖維編織的濾料,當氣流穿過時,由于摩擦產生靜電現象,同時有許多粉塵在輸送過程中也會由于摩擦或其他基質使其帶有電荷,這樣***可能在濾料和塵粒之間形成一個電位差,當塵粒隨著氣流趨向濾料時,由于庫侖力作用,促使粉塵和濾料纖維碰撞并增強濾料對粉塵吸附力而被捕集,從而提高過濾效率。
當塵粒的粒徑大于濾料孔隙時,塵粒即被濾料孔隙篩濾下來,因此篩濾效應能捕集粒徑大于孔隙的粉塵。當粉塵沉集在濾料表面上而使濾料孔隙變小時,粒徑較小的顥粒也不能從孔通過從而被捕集,隨著粉塵層的形成和加厚,篩濾擁集效率會顯著提高。
對于粒徑大、密度大的塵粒,在重力作用下可以自然沉降到濾料上,這種作用稱為重力沉降效應。
1.1 Product Overview:
袋式除塵器是利用多孔的袋裝過濾元件從含塵氣體中捕集粉塵的一種除塵設備。主要由過濾裝置和清塵裝置兩個部分組成。前者的作用是捕集粉塵;后者則用以定期清除濾袋上的積塵,保持除塵器的處理能力。通常還設有清灰控制裝置,是除塵器按一定的時間間隔和程序清灰。
Bag filter is a kind of dust removal equipment that collects dust from dust-containing gas by means of porous bag filter element. It mainly consists of filter device and dust removal device. The former role is to catch dust; The latter is used to regularly eliminate the dust on the filter bag to maintain the processing capacity of the dust collector. Usually also has the ash control device, is the dust collector according to the certain time interval and the procedure ash clearance, generally thinks the bag type dust collector certain time interval and the procedure ash clearance.
1.2. 過濾材料對塵粒的捕集
1.2. Filter material's collection of dust particles.
這一過程中包括觀星碰撞效應、截留效應、擴散效應、靜電效應、篩濾效應、重力沉降效應。
一般粒徑較大的粉塵主要依碰效應捕集,當含塵氣流接近濾料的纖維時,秋柳流線圍繞捕集纖維迅速拐彎,其中較大的粒子由于慣性力的作用,偏離了流線,繼續沿著原來的運動方向前進,同捕集纖維發生碰撞而被捕集。慣性碰撞時過濾除塵的主要機制之一,而塵粒能否同捕集纖維發生碰撞主要取決于運動粒子所具有的慣性力于的大有小,為了的提高慣,性可碰撞效以應,可的以適當生提高通如過濾料果的氣流的流速。
對于具有一定尺寸直徑的塵粒，質量可以忽略的塵粒，如果依據流線把他們帶到距捕集纖維表面d/2以內的距離***會被捕集。
在氣流中對于粒徑小于1m的塵粒由于氣體分子的運動撞擊,使其產生布朗悅動。這種塵粒無規則的運動,除了可能產生塵粒之間的凝集外,還有向低濃度區擴散的趨勢。由于捕集纖維表面的濃度較低,所以小塵粒向著纖維表面擴散,并與纖維碰撞而被捕集。當過濾速度較高時,擴散效應***會下降。
有許多人造纖維編織的濾料,當氣流穿過時,由于摩擦產生靜電現象,同時有許多粉塵在輸送過程中也會由于摩擦或其他基質使其帶有電荷,這樣***可能在濾料和塵粒之間形成一個電位差,當塵粒隨著氣流趨向濾料時,由于庫侖力作用,促使粉塵和濾料纖維碰撞并增強濾料對粉塵吸附力而被捕集,從而提高過濾效率。
當塵粒的粒徑大于濾料孔隙時,塵粒即被濾料孔隙篩濾下來,因此篩濾效應能捕集粒徑大于孔隙的粉塵。當粉塵沉集在濾料表面上而使濾料孔隙變小時,粒徑較小的顥粒也不能從孔通過從而被捕集,隨著粉塵層的形成和加厚,篩濾擁集效率會顯著提高。
對于粒徑大、密度大的塵粒,在重力作用下可以自然沉降到濾料上,這種作用稱為重力沉降效應。
1.2. 過濾材料對塵粒的捕集
1.2. Filter material's collection of dust particles.
This process includes stargazing collision effect, interception effect, diffusion effect, electrostatic effect, screening effect and gravity subsidence effect.
Generally, dust with large particle size mainly depends on impact effect. When the dusty air flow is close to the fiber of the filter material, the catch fiber quickly turns around on the flow line of the autumn willow, and the larger particles deviate from the flow line due to the action of inertial force, continue to move along the original direction, and get caught in collision with the catch fiber. In inertial collision, one of the main mechanisms of filtration and dedusting, and whether the dust particle can collide with the capturing fiber mainly depends on the size of the inertial force of the moving particle.
For dust particles of a certain size and diameter, particles of negligible mass will be trapped if the flow lines according to them bring them within d/2 of the surface of the trapping fiber.
For dust particles with particle size less than 1um in the airflow, Brownian motion is generated due to the collision of gas molecules. In addition to the possibility of agglutination between dust particles, the random movement of dust particles also tends to spread to low concentration areas. Because of the low concentration on the fiber surface, the small dust particles expand towards the fiber surface and collide with the fiber and get trapped. When the filtration speed is high, the diffusion effect will decrease.
There are many man-made fiber woven filter material, when the airflow through the electrostatic phenomenon due to friction, at the same time there are a lot of dust in the process of delivery will be due to friction or other substrate with charge, so that it may be in the filter material and form a potential difference between dust particles, when the dust particles as they tend to filter material, because of the coulomb force, prompting dust and strong collision and rights of filter material fibre was arrested for dust adsorption force, so as to improve the efficiency of filtering.
When the particle size of the dust particle is larger than the pore size of the filter material, the dust particle is filtered by the filter material pore, so the sieve effect can capture the dust particle size larger than the pore size. When the dust sinks on the surface of the filter material and the pores of the filter material become small, the particles with small size cannot pass through the pores and thus get trapped. With the formation and thickening of the dust layer, the screening efficiency will be significantly improved.
1.3 粉塵層對塵粒的捕集
1.3 Dust layer traps dust particles
如前所述,過濾操作一定時間后,由于粘附等作用,塵粒在濾料網孔間產生架橋現象,使氣流通過濾料的孔徑變得很小,從而使濾料網孔及其表面迅速截留粉塵形成粉塵層,當清灰后依照殘留一定厚度的粉塵,稱為粉塵初層。由于粉塵初層中粉塵粒徑通常都比纖維小,因此篩濾、慣性、截留和擴散等作用都有所增加,使除塵效率顯著提高。由此可見,袋式塵器的高效率,粉塵初層起著比濾料本身更為重要的作用,一般合成纖維布的網孔為20-50m,如為起毛的則為5-10 m,用這樣的濾料,只要設計得當,***是0.1pm的塵粒也能獲得將近****的除塵效率。
當濾袋表面積積附的粉塵層厚到一定程度時,需要對濾袋進行清灰,以******濾袋持續工作所需的透氣性。袋式除塵器正是在這種不斷濾塵而又不斷清灰的交替過程中進行工作的。
13 粉塵層對塵粒的捕集
1. 3 Dust layer traps dust particles
As mentioned above, after a certain time of filtration operation, due to adhesion and other effects, dust particles will bridge between the filter mesh, making the pore diameter of the filter material in air circulation become very small, so that the filter mesh and its surface can quickly intercept dust to form a dust layer. When the dust is cleaned, according to the residual dust of a certain thickness, it is called the initial dust layer. Since the particle size of dust in the initial layer of dust is usually smaller than that of the fiber, screening, inertia, interception and diffusion are all increased, which significantly improves the dust removal efficiency. It can be seen that the high efficiency of the bag filter, dust primary layer plays a more important role than the filter itself. Generally speaking, the mesh of synthetic fiber cloth is 20-50m, and if it is fluffiness, it is 5-10um. With such filter material, as long as it is properly designed, the dust particle of 0.1um can achieve nearly **** dust removal efficiency.
When the dust layer accumulated on the surface area of the filter bag is thick enough, it is necessary to clean the filter bag to ensure the air permeability required by the continuous work of the filter bag. It is in this alternating process of continuous dust filtering and continuous dust removal that the bag filter works.
1.2. Filter material's collection of dust particles.
This process includes stargazing collision effect, interception effect, diffusion effect, electrostatic effect, screening effect and gravity subsidence effect.
Generally, dust with large particle size mainly depends on impact effect. When the dusty air flow is close to the fiber of the filter material, the catch fiber quickly turns around on the flow line of the autumn willow, and the larger particles deviate from the flow line due to the action of inertial force, continue to move along the original direction, and get caught in collision with the catch fiber. In inertial collision, one of the main mechanisms of filtration and dedusting, and whether the dust particle can collide with the capturing fiber mainly depends on the size of the inertial force of the moving particle.
For dust particles of a certain size and diameter, particles of negligible mass will be trapped if the flow lines according to them bring them within d/2 of the surface of the trapping fiber.
For dust particles with particle size less than 1um in the airflow, Brownian motion is generated due to the collision of gas molecules. In addition to the possibility of agglutination between dust particles, the random movement of dust particles also tends to spread to low concentration areas. Because of the low concentration on the fiber surface, the small dust particles expand towards the fiber surface and collide with the fiber and get trapped. When the filtration speed is high, the diffusion effect will decrease.
There are many man-made fiber woven filter material, when the airflow through the electrostatic phenomenon due to friction, at the same time there are a lot of dust in the process of delivery will be due to friction or other substrate with charge, so that it may be in the filter material and form a potential difference between dust particles, when the dust particles as they tend to filter material, because of the coulomb force, prompting dust and strong collision and rights of filter material fibre was arrested for dust adsorption force, so as to improve the efficiency of filtering.
When the particle size of the dust particle is larger than the pore size of the filter material, the dust particle is filtered by the filter material pore, so the sieve effect can capture the dust particle size larger than the pore size. When the dust sinks on the surface of the filter material and the pores of the filter material become small, the particles with small size cannot pass through the pores and thus get trapped. With the formation and thickening of the dust layer, the screening efficiency will be significantly improved.
1.3 粉塵層對塵粒的捕集
1.3 Dust layer traps dust particles
如前所述,過濾操作一定時間后,由于粘附等作用,塵粒在濾料網孔間產生架橋現象,使氣流通過濾料的孔徑變得很小,從而使濾料網孔及其表面迅速截留粉塵形成粉塵層,當清灰后依照殘留一定厚度的粉塵,稱為粉塵初層。由于粉塵初層中粉塵粒徑通常都比纖維小,因此篩濾、慣性、截留和擴散等作用都有所增加,使除塵效率顯著提高。由此可見,袋式塵器的高效率,粉塵初層起著比濾料本身更為重要的作用,一般合成纖維布的網孔為20-50m,如為起毛的則為5-10 m,用這樣的濾料,只要設計得當,***是0.1pm的塵粒也能獲得將近****的除塵效率。
當濾袋表面積積附的粉塵層厚到一定程度時,需要對濾袋進行清灰,以******濾袋持續工作所需的透氣性。袋式除塵器正是在這種不斷濾塵而又不斷清灰的交替過程中進行工作的。
13 粉塵層對塵粒的捕集
1. 3 Dust layer traps dust particles
As mentioned above, after a certain time of filtration operation, due to adhesion and other effects, dust particles will bridge between the filter mesh, making the pore diameter of the filter material in air circulation become very small, so that the filter mesh and its surface can quickly intercept dust to form a dust layer. When the dust is cleaned, according to the residual dust of a certain thickness, it is called the initial dust layer. Since the particle size of dust in the initial layer of dust is usually smaller than that of the fiber, screening, inertia, interception and diffusion are all increased, which significantly improves the dust removal efficiency. It can be seen that the high efficiency of the bag filter, dust primary layer plays a more important role than the filter itself. Generally speaking, the mesh of synthetic fiber cloth is 20-50m, and if it is fluffiness, it is 5-10um. With such filter material, as long as it is properly designed, the dust particle of 0.1um can achieve nearly **** dust removal efficiency.
When the dust layer accumulated on the surface area of the filter bag is thick enough, it is necessary to clean the filter bag to ensure the air permeability required by the continuous work of the filter bag. It is in this alternating process of continuous dust filtering and continuous dust removal that the bag filter works.