Two-stage pulverizer fan installation problems and solutions 1.1 Problems At the beginning of 2008, after replacing the double-stage pulverizer tail fan impeller, the ventilation and output of the two-stage pulverizer decreased drastically, and the hot air flow in the furnace was difficult to enter the machine, and the furnace appeared positive. Pressure. Soon, the slag feed slip in the furnace burned out and the refractory brick was seriously damaged. After investigation, the fan installation has the following problems:
1) The maintenance personnel installed the original vortex door on the fan, but there was an error in the installation procedure (no moving fan casing, making the fan impeller and vortex difficult to assemble), the fan impeller and the vortex could not meet the drawing assembly requirements, After the vortex is cut, the vortex does not block the impeller rotation, but the gap between the impeller and the vortex is large (the installation design standard requires less than 2mm), and the Zui is more than 8mm.
2) When the fan impeller is replaced, the maintenance worker does not assemble the fan's vortex (flare). The fan has a large amount of circulating air, which greatly reduces the ventilation. The motor current of the fan is reduced from 55A to 45A during normal production.
3) When installing the fan in general, first locate the fan casing, then install the impeller, observe the gap uniformity between the impeller and the casing, and install the fan vortex after the Zui. Whether the gap between the vortex and the impeller can meet the design requirements can only be observed by observation, and it is difficult to meet the design requirements in most cases.
1.2 Solution and effect 1) Re-determine the installation requirements of the fan, first remove the positioning bolt of the fan casing, after the impeller is installed, install the vortex (the vortex is installed on the fan casing), and adjust the fan casing Ensure that the clearance between the impeller and the vortex door meets the design requirements, and then ensure that the fan housing is positioned and fixed under the premise of ensuring proper clearance between the impeller and the vortex.
2) Replace the damaged vortex.
After installation according to the above method, the fan motor current exceeds 55A (the damper is not fully opened), and the ventilation of the two-stage pulverizer is significantly increased. After cleaning the level of the two-stage pulverizer and the ash at the bend, the fan damper can meet the requirements of the normal production of the two-stage pulverizer in the case of opening 6 grids (8-square size). Finding a problem is not a bad thing. In the process of learning, only if you find a problem can you prove that you are studying hard and then discover the problem, and you will be one step closer to your dream. The two-stage pulverizer has the same problems as the general machinery. No one wants to deal with the problem when there is a problem, which will not only affect the production, but also miss the repair time.
1) The maintenance personnel installed the original vortex door on the fan, but there was an error in the installation procedure (no moving fan casing, making the fan impeller and vortex difficult to assemble), the fan impeller and the vortex could not meet the drawing assembly requirements, After the vortex is cut, the vortex does not block the impeller rotation, but the gap between the impeller and the vortex is large (the installation design standard requires less than 2mm), and the Zui is more than 8mm.
2) When the fan impeller is replaced, the maintenance worker does not assemble the fan's vortex (flare). The fan has a large amount of circulating air, which greatly reduces the ventilation. The motor current of the fan is reduced from 55A to 45A during normal production.
3) When installing the fan in general, first locate the fan casing, then install the impeller, observe the gap uniformity between the impeller and the casing, and install the fan vortex after the Zui. Whether the gap between the vortex and the impeller can meet the design requirements can only be observed by observation, and it is difficult to meet the design requirements in most cases.
1.2 Solution and effect 1) Re-determine the installation requirements of the fan, first remove the positioning bolt of the fan casing, after the impeller is installed, install the vortex (the vortex is installed on the fan casing), and adjust the fan casing Ensure that the clearance between the impeller and the vortex door meets the design requirements, and then ensure that the fan housing is positioned and fixed under the premise of ensuring proper clearance between the impeller and the vortex.
2) Replace the damaged vortex.
After installation according to the above method, the fan motor current exceeds 55A (the damper is not fully opened), and the ventilation of the two-stage pulverizer is significantly increased. After cleaning the level of the two-stage pulverizer and the ash at the bend, the fan damper can meet the requirements of the normal production of the two-stage pulverizer in the case of opening 6 grids (8-square size). Finding a problem is not a bad thing. In the process of learning, only if you find a problem can you prove that you are studying hard and then discover the problem, and you will be one step closer to your dream. The two-stage pulverizer has the same problems as the general machinery. No one wants to deal with the problem when there is a problem, which will not only affect the production, but also miss the repair time.
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