vertical cyclone separator adopts the upper part of the bag pumping mode. After the skeleton is extracted during bag changing, the dirty bag is put into the ash bucket at the lower part of the box and taken out from the manhole, thus improving the operating conditions of bag changing. vertical cyclone separator box adopts air-tight design, good sealing, inspection door with excellent sealing materials, the production process with kerosene leak detection, air leakage rate is very low. vertical cyclone separator inlet and outlet air duct arrangement is compact, the airflow resistance is small.
vertical cyclone separator is widely used for flue gas purification of coal-fired boiler, and its dust removal efficiency is not only related to the performance of the filter material itself, but also related to the internal structure and operating conditions of the dust collector. The inner baffle and baffle of the dust collector can change the airflow distribution and homogenize the flow rate of the flue gas, so that the cloth bag can be fully utilized. Whether the flue gas velocity field is uniform in the dust collector box is unknown and cannot be calculated.
In the actual design, the designer often determines whether the baffle is added or not and its size by feeling and experience, and there is blindness. To optimize the design through a large number of experiments will waste a lot of material, human and financial resources. With the emergence and development of fluid dynamics computing software FLUENT, it is possible to use numerical analysis method to study the law of flue gas flow inside bag dust collector, which can reduce the number of simulation experiments or even do not need simulation experiments.
vertical cyclone separator hopper In the design process, pay attention to the viscosity of the dust. Then there is the Angle and capacity of the dust hopper of the dust collector. In a large dust collector, there are generally multiple ash buckets, and the ash bucket is equipped with a level meter, a vibrator, an air gun, a detection door, and a star discharger and a screw conveyor. The Angle between the inclined wall of the hopper and the ground is greater than the natural resting Angle of the loose body in the hopper.
Dust hopper is generally designed to be square or nearly square with a small part of the circle. In addition to determining the volume of the ash hopper and the size of the lower ash mouth according to the process requirements, its strength should be calculated. The ash bucket assembly, like the air intake device, the middle box and the upper box, belongs to the negative pressure device. The purpose of its strength calculation is to determine that it can meet the normal operation of the dust collector under the specified large negative pressure (or the specified positive pressure), and will not be thin dented (dented) phenomenon. The thickness of the dust bucket wall plate of the bag dust collector is generally 5mm.
vertical cyclone separator shell structure form, can be divided into plate structure, skeleton structure, and cylinder structure, in the plate and skeleton shell structure based on the light steel structure shell has also been applied in the project.
vertical cyclone separator structure form:
1. Cylinder structure. Considering the stability of the structure and operation, it is more appropriate to design the bag dust collector into a cylindrical shape, especially in the case of pressure resistance. From the current situation, the small bag type dust collector and the bag type dust collector for purifying gas are often designed into a cylindrical shape, such as the bag dust collector for blast furnace gas.
2, plate shell structure. The shell of the dust collector is surrounded by flat members, and this structural form of the box can be prefabricated in the factory, and then assembled with temporary bolts at the construction site, and then the joint welding seal. The plate structure of the bag filter, usually in the height direction, such as the length of the bag below 6 meters, can be a piece to the top, such as the use of 10 meters long bag can be divided into two sections, the general box interior should be supported.
3, skeleton shell structure. The filter bag chamber of this kind of structure is composed of columns and beams, columns are set up around the box, and there are multiple beams connected between the columns, and then the wall plate is attached to the beam column to form a closed enclosure of the box. The advantages of this upper box structure are that there is no support inside the box, and more filter bags can be arranged, and the clearance between the filter bags is larger, the air permeability is good, and the inspection is also convenient. The whole box is stronger and the stiffness is larger, but the disadvantage is that the steel consumption is larger and the weight of the equipment is increased.
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