在除尘器内部,滤袋低端含尘气体能够上升的实际速度,就是气流上升速度。气流上升速度的大小对滤袋被过滤的含尘气体磨损及因脉冲清灰而脱离滤袋的粉尘随气流重新返回除尘布袋表面有重要影响。气流上升速度是除尘器内烟气不应超过的最大速度,达到和超过这个速度,烟气中的颗粒物就会磨坏滤袋或带走粉尘,甚至导致设备运行阻力偏大。

　　袋式除尘器进行过滤时分为内滤和外滤两种,前者含尘气流由滤袋内部流向外部,后者含尘气流由滤袋外部流向滤袋内部。

　　内滤式袋式除尘器气流上升速度按下式计算:

　　Vk = Sa•Vc/S

　　式中　 Vk———除尘器气流上升速度,m/min;

　　Sa———单条滤袋过滤面积,m2;

　　Vc———过滤速度,m/min;

　　S ———滤袋口的截面积,m2。

　　外滤式袋式除尘器气流上升速度按下式计算:

　　Vk =Qv/(SA-nS)

　　式中　Vk———除尘器气流上升速度,m/min;

　　Qv———滤袋室的处理风量,m3/min;

　　SA———滤袋室袋低处的截面积,m2;

　　n ———滤袋室滤袋数量, 个。

　　过滤速度和气流上升速度二者在袋式除尘器内各处都应保持在一定范围内。如果过滤风速选择不当或分室分布不均,会影响滤袋的寿命,同样,气流上升速速选择不当或分室的气流上升速度不均,也会影响滤袋使用寿命。因此,在设计中不仅要设计合理的因此,在设计中不仅要设计合理的过滤风速及使气流分布均匀的导流技术,而且要按粉尘的粒径、浓度、工况条件设计选择合理的气流上升速度,才能确保延长滤袋使用寿命。

Note warehouse roof of airflow rising speed of introduction:

Precipitator internal filter bag dust low end of the actual speed of the gas can rise air rising speed. The size of the air rising speed of dusty gas filter bag is filtered wear and due to the pulse cleaning out the dust with the air filter bag back dust bag surface. The air rising speed precipitator flue gas should not exceed the maximum speed, reach and exceed this rate, the particulate matter in the flue gas will be worn bag or take away dust, or even lead to devices running resistance is too large.

Is divided into two kinds of inner filter and the outer filter baghouse filter, the former dust stream flow inside the filter bag to an external the latter dust stream flows to the filter bag internal filter bag external.

The filter baghouse air rising speed is calculated as follows:

Vk = Sa • Vc / S

Where Vk --- rising of airflow speed, m / min;

Sa --- single bag filter area, m2;

Vc --- filtration speed, m / min;

S --- bag mouth of the cross-sectional area, m2.

The external filter baghouse air rising speed is calculated as follows:

Vk = Qv / (SA-nS)

Where Vk --- rising of airflow speed, m / min;

Processing Qv --- bag room air flow, m3/min;

SA --- bag chamber bag low at the cross-sectional area, m2;

number of bags, a n --- bag room.

The filtration rate and the airflow rising speed of both should be kept within a certain range around within the baghouse. Inappropriate choice of uneven distribution or sub-room filtration velocity will affect the life of the filter bags, air rising Similarly, make haste to choose inappropriate or sub-room air rising speed uneven, will also affect the filter bag life. Therefore, in the design, not only to design rational design not only to design a reasonable filtration velocity and uniform air distribution diversion technology, and according dust particle size, concentration, working conditions reasonable airflow design choices increasing speed, in order to ensure that the to prolong filter bag life.

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