belt filter press/belt filter press for wastewater treatment/solid-liquid separation equipment

1.Properties&Uses

YMbelt type filter press is my company on the basis of digesting and absorbing foreign advanced technology developed by a new type of efficient sludge treatment equipment, it has high efficiency, low energy consumption, good dewatering effect, simple structure, easy maintenance, low noise, smooth operation, safe and reliable, continuous automatic production advantages. Now it is widely used in petroleum, chemical, coal, metallurgy, building materials, textile, food and water environmental protection and other projects on the solid-liquid separation.

Sludge belt type filter press is on the basis of the original belt press filter increased concentration, sludge thickener including condensed sections, dehydration, sludge mixed reaction system, can be directly to the second pond sludge moisture content (99.2 99.6%) for enrichment dehydration, eliminating the traditional concentrated tank, saving a large amount of investment. Belt type filter press is a kind of concentrated in the processing of materials (95-98% moisture content) further dehydration effective equipment into a pancake, with continuous automatic production, equipment installation, the characteristics of low cost of production and can be replaced with different mesh filter, continuous stepless speed regulation, so as to adapt to different kinds of materials of solid-liquid separation. The machine has reasonable structure, prevent water splashing, roll system installation precision is high, the partial less, extend the filter belt, bearings, and the service life of pneumatic components, main transmission adopts motor stepless speed regulation, increase speed range, stable operation, wash water front increased cleaning brush, improve the effect of the filter belt washing, reduced the rinse water, increase

2.Working principle 

Belt type filter press can be divided into four basic stages: in the whole process of sludge flocculation, filter press gravity dehydration, filter press gravity dehydration, squeeze dewatering.

2.1 sludge flocculation

Before sludge dehydration must go through the flocculation process and flocculation refers to using a flocculant (i.e., a kind of polymer, polymer electrolytes) was carried out on the suspension to processing, flocculating agent mixed with sludge classics agitate, cause solid phase particles in the suspension system of bonding produces condensation phenomenon, make the solid phase liquid phase separation. Sludge flocculation is in the process of flocculation reactor and sludge residence time in the flocculation reactor about 1 to 3 min.

2.2 the gravity dehydration

Approved by flocculation in the sludge moisture content 99.3% the thickener gravity dehydration, sludge moisture content of up to 95-98%, in order to reduce the liquidity of sludge before squeezing must emerge more free water and gravity dehydration is to achieve this function, the sludge in the filter belt is not affected by external forces, belt sludge load on the operation period of a dip, mud and water and filter with different friction coefficient, mud with the belt drive up line, water down, sludge has a process of accumulation, relative to extend the time of the gravity dehydration, emerge in favour of free water. Sludge through a reverse return to squeeze the filter belt, before getting into two filters clamping press, in a single filter with random running, its role is to make the sludge evacuation, evenly distributed on the surface filter with further dehydration.

2.3 press dehydration

Gravity sludge dewatering, up and down with the moving of the belt into the filter with the wedge between the pressure and get to the compression dewatering, and remove part of the free water on the surface of the sludge, and then enter the composed of seven roller "S" shape pressing section, due to the sludge as the filter with multiple stick between variable to bending shear stress, so as to extract the internal free water.

3. major institutions and features:

3.1 major institutions

3.1.1 belt filter main transmission device

For belt press filter with different speed requirements of transmission device is composed of speed reducer, transmission shaft, motor. Reducer shaft mounted mechanical stepless variable speed machine. Driven by a frequency converter speed through the PLC control electric cabinet, to achieve the goal that can adjust the belt speed; Motor adopts stepless variable speed drive, drive device with overload and overheating protection function, motor protection grade is IP55, insulation class F. Both main drive roller external package with neoprene, increase the filter band and the coefficient of friction between the rollers. Main drive roller driven belt movement, filter belt speed can be in the range 1.5 6.0 m/min stepless speed regulation. Bearing life should be more than 10000 hours. Drive with overload and overheating protection function, the motor for IP55 protection grade, F class insulation.

3.1.2 take up tight and filter with automatic correction device

On the belt press filter take up tight and take rectifying devices are controlled by a pneumatic system. Upper and lower filter belt tension bridle respectively on two hanging cylinder. When need to adjust the filter with the required tension can be adjusted to control the pressure reducing valve, filters when tight cylinder with make up tight oil cylinder with pressure setting up filters. On both sides of the upper and lower filters with motor reversing valve, when the filter belt running deviation in normal position 15 mm, will touch the directional control valve, turn on the valve inside the gas path, make rectification cylinder to drive correction roller offset Angle, change the direction of friction force component and size, under the action of rectifying roller belt returned to in situ. When filter belt deviation is greater than 25 mm and have special factors make the pneumatic control filter belt failure, extrusion rod filters edge met with proximity switch can temporarily stop and alarm.

3.1.3 with flushing devices

Belt press filter in the process of work, the filter with continuous operation, to maintain the filters clean, avoid the material fall into filter with gap caused by congestion, the upper and lower filter belt and enrichment zone return period, a flushing device, such as flushing water tanks, water pipe, water pipe and valve, special can replace the nozzle, inside the pipe is equipped with a brush. Flushing device has good sealing ability, easy to maintenance and cleaning, flushing water splash wet mud cake, flush nozzle with automatic cleaning device. When the filter belt running after flushing cistern, filters is rinsed clean, ready for the next sludge press cycle.

3.1.4 filters

Filter press filters adopt polyester monofilament net, with the strength of > 600 n/cm, life can reach 10000 hours, heat setting, filters for no joint, high tensile strength, resistance to twist, durable, acid and alkali resistance, temperature changes, etc. Enrichment effect is good, can make the sludge concentration to 95-98%, belt is easy to wash, for subsequent dewatering machine reduces the load at the same time.

3.1.5 into the mud pump and dosing pump.

Into the mud and the use of single screw pump and dosing pump with electric flow control device, the adjusting range of 45-100%; Trouble-free accumulation of pump running time is more than 20000 h. Firmly with the stator rubber and shell, the working face no juncture, porosity and cracks and other defects. The working life of the stator of no less than 40000 hours. The bearing temperature rise shall not exceed the environment temperature 35 ℃, the limit temperature should not exceed 80 ℃. Bearing adopts mechanical or packing seal. The noise of the pump shall not exceed 70 db (A). Pump shell material is cast iron, rotating parts material is stainless steel, screw materials for corrosion resistant hard alloy steel, the stator material is hard wear-resisting rubber, motor for adjustable speed motor, the motor should have current protection function, motor protection grade is IP55, insulation class F.