Common faults and troubleshooting of flash dryer [2]

In the previous article, Xiaobian introduced the common faults of flash dryer, the common faults of feeding and crushing system, and the common faults of some receiving systems and main engines 1 Receiving system: 1 Discharging is not smooth: due to the strong adhesion of light and fine materials, it may cause unsmooth phenomenon when discharging under the cone under the cyclone At this time, the cone must be gently knocked to make the materials attached to the pipe wall fall after being vibrated In order to ensure that the cyclone cone does not deform when being knocked, reinforcing rings or vibrating iron bars can be added on the cone
2 Discharge: in general, most of the dry products of the flash unit should be discharged in the collection type cyclone separator For example, there is too much material accumulated in the secondary cyclone or pulse bag filter, that is, there is a problem in the sealing or operation of the collection type cyclone separator The solid content of the waste gas collected by the pulse bag filter should be controlled below 2% When there is too much solid in the exhaust gas, It is necessary to check whether the dust remover is deflated Cause: A when the two extraction plates of the cyclone separator are opened at the same time during discharging, the air leakage will flow back the cyclone and the crushed materials in the pipeline in an instant, increase the working pressure of the two-stage cyclone and the pulse bag type dust remover, which can be eliminated according to the operation procedures B the fineness of the powder is less than the mesh number of the filter bag When the fineness of the material is less than 200 mesh, the dust removal effect of the general pearl filter bag will be affected The filter bag shall be replaced regularly after one year of normal use, so as to achieve good effect If the material is too fine, membrane filter bag shall be used C if the filter bag is damaged or the binding port slips, the filter bag shall be replaced in time and the binding port shall be tightened so that the equipment can be used normally to achieve good effect D the sealing performance of the flower plate and venturi is poor (the screw is loose or the rubber washer is aging), the screw shall be fixed and the washer shall be replaced E if the air temperature is too high (above 150 ℃), the filter bag will harden and deform, which will affect the effect of the filter bag The temperature control of the equipment shall be adjusted in time F it is recommended to add water bath dedusting to ensure dust collection and environmental protection effect II Host dust and powder spraying: when the flash drying unit is in normal operation, the pipe is under negative pressure operation, i.e the air pressure and air volume of the induced draft fan shall be greater than that of the blower When the host dust occurs, the following systems shall be carefully checked for failure 1 Excessive feeding and too much material accumulation in the crushing chamber cause that the semi-dry material cannot pass through the classifier smoothly, so the feeding amount shall be reduced appropriately 2 The discharge of cyclone separator and pulse bag filter is not timely, which causes serious material accumulation, resulting in excessive working pressure of equipment and insufficient air pressure At this time, discharge measures shall be taken immediately to ensure the air effect 3 The pulse instrument of the pulse bag filter does not work, which causes the filter bag to be blocked and the system to be under positive pressure At this time, the pulse controller must be checked and started immediately to ventilate the filter bag.