The working process of a filter press is divided into three stages: "feeding and filling", "pressing and dewatering", and "pressure maintaining and forming". Each stage has distinctly different requirements for the pressure and flow rate of the plunger pump:
Feeding and Filling Stage: It is necessary to quickly inject the slurry into the filter chamber of the filter press and fill the gaps of the filter cloth. This stage requires "large flow rate and medium-low pressure" to avoid filter cloth blockage caused by excessively slow flow rate;
Pressing and Dewatering Stage: After the filter chamber is filled, the pressure needs to be gradually increased to squeeze the slurry and discharge water. This stage requires "high pressure and small flow rate" – the pressure must be sufficient to overcome the slurry resistance, while preventing filter plate deformation caused by excessively large flow rate;
Pressure Maintaining and Forming Stage: A stable pressure is maintained to... ensure the filter cake moisture content meets the standard. This stage requires "constant pressure and micro-flow rate" to compensate for minor leaks and keep the filter chamber pressure constant.
As a supporting equipment specially designed for filter presses, the adjustability and stability of parameters such as pressure and flow rate of the YB250 plunger pump directly determine whether the filter press can... operate smoothly in each stage. The higher the parameter matching degree, the "shorter the filtration cycle, the lower the filter cake moisture content, and the more energy-saving" the filter press will be.
The YB250 plunger pump is designed with multiple sets of adjustable parameters for filter press working conditions. Among these, pressure, flow rate (displacement), and power are the three core factors affecting filtration efficiency, which need to be set based on the filter press model and slurry characteristics (concentration, viscosity, particle size)...
Pressure is the key driving force for filter presses to squeeze slurry and discharge water. The pressure parameter of the YB250 plunger pump must match the "rated working pressure" of the filter press and the "slurry pressing demand". The core indicators include:
Rated Working Pressure: The rated working pressure of the YB250 plunger pump is 2.0MPa, which is compatible with mainstream plate-and-frame filter presses (rated pressure: 12-16MPa) and box-type filter presses (rated pressure: 10-18MPa). It should be noted that the pressure resistance limit of the filter press’s filter plates and filter cloth must be ≥ the pump’s output pressure. For example, for a filter press with a pressure resistance of 12MPa, the output pressure of the YB250 should be set to 10-12MPa to avoid filter plate rupture caused by overpressure.
Pressure Adjustment Range: Supports stepless adjustment from 0.5MPa to 2.0MPa, which can be set in stages according to slurry characteristics. For instance, when handling low-concentration (≤30%) and low-viscosity slurry (≤500cP), the pressing pressure can be set to 8-10MPa; when handling high-concentration (≥50%) and high-viscosity slurry (≥1000cP), the pressure needs to be increased to 12-14MPa to... ensure the filter cake moisture content is reduced to below 20%.
Pressure Maintenance Accuracy: During the filter press pressure maintenance stage, the pressure fluctuation of the YB250 plunger pump is ≤±0.2MPa, much lower than the ±0.5MPa of traditional pumps, which can prevent the rebound of filter cake moisture caused by pressure fluctuations. When a chemical enterprise used the YB250 for pressure maintenance while treating sludge slurry, the filter cake moisture content was stably maintained at 18%-20%, a 3-5 percentage point reduction compared to the 22%-25% of traditional pumps.
Flow rate determines the speed of slurry injection into the filter chamber and the dewatering efficiency during the pressing stage. The flow rate parameter of the YB250 plunger pump needs to balance "filling speed" and "pressing effect". The core indicators include:
Rated Displacement: The rated displacement of the YB250 plunger pump is 25m³/h (referring to the theoretical maximum flow rate; the actual output is subject to pressure loss), which is suitable for filter presses with a filtration area of 100-300㎡. For example, a 200㎡ plate-and-frame filter press has a full filter chamber volume of approximately 5m³, and the YB250 can complete the feeding and filling within 15-20 minutes (a traditional 20m³/h pump takes 25-30 minutes), shortening the filtration cycle by 30%.
Flow Rate Adjustment Methods: Supports two methods: "frequency conversion adjustment" and "plunger stroke adjustment". Frequency conversion adjustment changes the motor speed to achieve stepless control of 10%-100% flow rate, which is suitable for rapidly increasing the flow rate during the feeding stage and slowly reducing it during the pressing stage; stroke adjustment fixes the output flow rate (e.g., 50% or 75% displacement) by adjusting the reciprocating stroke length of the plunger, which is suitable for long-term operation under stable working conditions.
The power parameter of the YB250 plunger pump must match the energy consumption demand of the filter press to avoid "overcapacity operation" (a "big horse pulling a small cart") or "insufficient power" (a "small horse unable to pull"). The core indicators include:
Supporting Motor Power: Equipped with a standard 22kW three-phase asynchronous motor (380V/50Hz). Under the working conditions of rated pressure (16MPa) and rated flow rate (25m³/h), the actual operating power is approximately 20-22kW, which reduces energy consumption by 40%-50% compared to traditional pumps with the same parameters (equipped with a 55kW motor).
Energy Consumption Characteristics: Adopts a "load self-adaptation" design; when the flow rate and pressure decrease, the motor power decreases synchronously.
Energy Consumption Matching with Filter Press: Taking a 200㎡ filter press as an example, a single filtration cycle (including feeding, pressing, and pressure maintenance) takes approximately 1.5 hours. The total energy consumption of the YB250 is about 50-55kWh, saving 20-25kWh per cycle compared to traditional pumps (70-75kWh). Calculated based on 8 cycles per day, the annual energy saving exceeds 50,000kWh.
In addition to pressure, flow rate, and power, the following parameters of the YB250 plunger pump also need to be adapted to the filter press:
Medium Temperature Adaptation Range: -10℃ to 120℃, which can handle common normal-temperature slurry (20-40℃) and heated slurry (e.g., 80-100℃ high-temperature sludge in the chemical industry) of filter presses, preventing pump body seal failure caused by excessively high temperatures.
Suction Lift: ≤5m, which is suitable for the conventional installation height of filter press slurry tanks (usually the slurry tank is 1-3m lower than the pump body) to... ensure stable slurry suction and avoid idling.
Continuous Operation Time: Designed for 24-hour continuous operation, matching the working condition requirements of filter presses for "batch operation + continuous production" and avoiding equipment wear caused by frequent starts and stops.
In practical applications, if the parameters of the YB250 plunger pump do not match the filter press and slurry characteristics, the following problems are likely to occur and need to be focused on avoiding:
Excessively increasing the pressure (e.g., exceeding the filter press’s rated pressure by more than 20%) will cause filter plate deformation and filter cloth damage, which instead increases the risk of liquid leakage and significantly raises energy consumption. For example, for a filter press with a pressure resistance of 12MPa, when the pressure is set to 15MPa, the filter plate damage rate increases from 1% to 8%, while the filter cake moisture content shows no significant decrease.
An excessively large flow rate during the feeding stage (e.g., exceeding the filter cloth’s filtration speed) will cause particles in the slurry to accumulate rapidly on the filter cloth surface, forming a "blocking layer" and instead prolonging the filtration time. For example, when handling slurry containing fine particles (≤100μm), reducing the flow rate from 25m³/h to 20m³/h shortens the feeding time from 20 minutes to 15 minutes.
For high-viscosity slurry (≥1500cP), the initial flow rate needs to be reduced and the pressure increased. If operated with conventional parameters, problems such as "poor slurry transportation and uneven filter chamber filling" are likely to occur. For example, when handling sludge slurry (viscosity 2000cP), setting the flow rate to 15m³/h and pressure to 10MPa makes it easier to form a uniform filter cake compared to the default 25m³/h.
The... operation of a filter press does not rely solely on the performance of a single piece of equipment, but on the parameter synergy between the "filter press + plunger pump". The operating parameters such as pressure, flow rate, and power of the YB250 plunger pump are like a power output system "tailor-made" for the filter press. By... matching the requirements of different stages, it achieves the goals of "rapid filling, sufficient dewatering, and stable pressure maintenance".
For enterprises, mastering the parameter setting logic of the YB250 plunger pump can not only improve the production efficiency of the filter press, but also reduce energy consumption and operation and maintenance costs – this is precisely why "parameter adaptation" is more important than "equipment performance". In the future, with the intelligent development of filter press systems, the parameter adjustment of the YB250 plunger pump will gradually realize "automatic adaptation" (real-time monitoring of slurry characteristics through sensors and automatic adjustment of pressure and flow rate), further reducing the cost of manual intervention and promoting efficiency upgrading in the field of solid-liquid separation.
