No matter what kind of equipment, various problems will inevitably be encountered in the production and use process, and the belt filter press is no exception. This article summarizes the common fault types and solutions of belt filter presses for your reference.
Belt filter press is a kind of sludge dewatering and drying equipment used in the field of sludge treatment. The equipment consists of two uppers and lowers tensioned filter belts entraining the sludge layer from a series of regularly arranged roller press cylinders. It passes through in an S shape, relying on the tension of the filter belt itself to form the squeezing and shearing effect on the sludge layer, squeezing out the capillary water in the sludge layer to remove the water in the slurry and obtain a higher solid content Mud cakes.
The filter belt is off-track and discounted
During the operation of the belt filter press, the filter belt is often deviated and discounted. When the crease of the filter belt and the sludge scraper is constantly rubbing, the filter belt will be broken and the service life will be greatly shortened. Bring greater economic losses. Through analysis, we found that the main reasons for the deviation of the filter belt are as follows.
1. The movement of the correction roller is not sensitive
The operation of the correction roller is not sensitive, which will cause the filter belt to deviate to one side. Once the limit switch fails, one end of the filter belt touches the frame of the dehydrator and will roll over and be damaged. When this happens, if the trachea or airbag is damaged, it should be replaced in time. The correction slider is rusted and blocked and needs to be lubricated. If the correction valve is faulty or the correction angle is adjusted incorrectly, it needs to be repaired in time.
2. The position of the roller pressing cylinder is incorrect or partly worn
When the position of the press roll or the tension roll of the belt press is unbalanced, the gap between the rolls at both ends of the filter belt will change, which will cause uneven force on both sides of the filter belt, and the filter belt will deviate from the larger force to the smaller force. . Therefore, before starting the belt filter press, check whether the roller installation is balanced or not. This situation is likely to occur after the overhaul of the belt press. At the same time, the bearings and rollers should be maintained regularly, and if they are worn, they should be repaired in time.
3. Uneven cloth mud
When the filter belt is unevenly distributed after pre-dehydration, the sludge enters the pressing section, which will cause the mud cake on the filter belt to be thick on one side and thin on the other side, and the filter belt will shift to the thick side of the mud. The offset force and the correction and correction force contradict each other in opposite directions, and the filter belt will bend at the thick and thin boundary of the mud layer. After the equipment is started up, it is necessary to carefully observe the sludge distribution of the filter. When the partial load is severe, it is necessary to clean the sludge inlet distribution facilities and adjust the position of the flat mud plate. If the rakes are partially worn or not installed properly, the rakes need to be inspected and repaired.
The filter belt is too dirty and not cleaned
The filter belt is in a dirty state for a long time and is not washed clean, which will seriously affect the water permeability of the filter belt, resulting in abnormal sludge dewatering, poor desilting effect, and increased water content of the mud cake. The main reasons are as follows.
1. Improper proportion or dosage of flocculant
The flocculation of the sludge has a great influence on the dewatering effect. If the concentration or dosage of the flocculant is too high, it will not only waste the medicine, but also stick to the filter belt to reduce the water permeability, and vice versa, it will also affect the dewatering of the sludge. During the operation, the proportion and dosage of the agent should be adjusted appropriately according to the characteristics of the sludge and the moisture content of the concentrated sludge. At the same time, prolong the stirring time of the flocculant as much as possible to fully dissolve the solvent and avoid flocculent residues to block the pores of the filter cloth.
2. The flushing water pressure is low, and the filter belt is not clean
This situation is usually caused by the leakage of the flushing water pipe, the failure of the flushing pump, the clogging of the backflushing filter, or the clogging of the nozzle of the flushing filter belt, the filter belt is not cleaned, it is easy to cause the filter hole to be blocked, which affects the filter belt. Filtration efficiency. When you find that the flushing water pressure is low, you can first check whether the flushing water pipeline is leaking or the flushing water pump is malfunctioning, and observe the pressure intensity of the flushing water at any time, and if the filter is clogged, clean it up in time.
The filter belt slips
The slippage of the filter belt is mainly caused by the overload of the mud inlet, the insufficient tension of the filter belt, the flocculant on the surface of the driving roller, the wear of the rollers, or the inflexible squeeze and rolling. At this time, it can be improved by reducing the mud intake, and at the same time carefully checking whether the rollers are inflexible or partially worn, to strengthen the lubrication of the bearings and gears.
The above is today’s sharing, if you encounter other problems, please consult us.
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