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Russian How to Improve the Working Efficiency of Belt Filter
Belt filters are known for their continuous, stable operation, low energy consumption, and ease of use, making them a significant presence in the market. As a result, many seek to enhance the sludge filtration and dewatering performance, which necessitates finding ways to improve the working efficiency of belt filters. The following are several methods for reference.
Measures to Improve Efficiency
Reasonable use of flocculant
When operating a belt filter, insufficient dosage leads to poor conditioning, preventing the capillary water in the sludge from converting into free water for removal in the gravity zone. As a result, the sludge remains fluid as it moves from the wedge zone to the low-pressure zone, making it unsqueezable. Conversely, excessive dosage increases treatment costs and, more critically, raises sludge activity, which can easily cause the filter belt to become clogged. For different types of sludge, it is necessary to reasonably select flocculants and confirm the dosage of flocculants through experiments to obtain satisfactory flocculation.
Controlling belt speed
The filter belt speed determines the sludge dewatering time in each working area and affects the solid content, thickness, and ease of peeling of the mud cake. A lower belt speed results in higher solid content, a thicker mud cake, and easier peeling from the belt. In contrast, a higher belt speed leads to lower solid content, a thinner mud cake, and greater difficulty in peeling it off.
Therefore, from the perspective of mud cake quality, a lower belt speed is preferable; however, the belt speed also directly affects the processing capacity of the dewatering machine. The lower the belt speed, the smaller the processing capacity. For a specific type of sludge, there is an optimal belt speed control range. Within this range, the dewatering machine can ensure a certain processing capacity while producing high-quality mud cakes and achieving a high solid recovery rate. Regardless of the sludge input volume, the belt speed should generally not exceed 5 m/min. If the belt speed is too high, the gravity dehydration time will be significantly shortened, preventing the sludge in the wedge zone from meeting the necessary conditioning requirements. Consequently, when the sludge enters the low-pressure or high-pressure zones, it may not dewater effectively and can overflow from the filter belt, leading to material leakage.
Control the amount of mud input
The processing capacity of the belt filter is determined by two main objectives: the amount of sludge input and the solid load of the sludge input. Both the sludge input quantity and the solid load depend on the belt speed, the tension of the filter belt, and the conditioning of the sludge. In turn, the belt speed, filter belt tension, and sludge conditioning are influenced by the desired dewatering effect, specifically the solid content of the mud cake and the solid recovery rate.
Therefore, when the sludge properties and dewatering effect are certain, the amount of mud input and the solid load of mud input are also certain. If the amount of mud input is too large or the solid load is too high, the dewatering effect will be reduced. During operation, according to the requirements of mud quality and dewatering effect, the belt speed, tension dosage, and other parameters should be repeatedly adjusted to obtain the appropriate amount of mud input and solid load of mud input.
Conclusion
Through the above measures, the operating efficiency of the belt filter and the mud cake dehydration effect can be significantly improved, thereby achieving higher production benefits and lower operating costs.
