Sewage treatment integration equipment The choice of filler type to consider the separation process requirements, usually consider the following aspects:
(1) mass transfer efficiency is higher. Generally speaking, the mass transfer efficiency of structured packing is higher than that of bulk packing.
(2) flux to large. In the premise of ensuring a high mass transfer efficiency, should be selected with a high pan speed or gas phase kinetic energy of the filler.
(3) the packing layer pressure drop is low.
(4) filler anti-fouling performance, disassembly, easy maintenance.
Sewage treatment integration equipment filler specifications refers to the nominal size or specific surface area of the filler.
1. Bulk packing specifications
Industrial tower commonly used bulk filler mainly DN16, DN25, DN38, DN50, DN76 and other specifications. Similar filler, the smaller the size, the higher the separation efficiency, but the resistance increases, the flux decreases, packing costs also increased a lot. The large size of the filler applied to the small diameter tower, will produce poor liquid and serious wall flow, so that the separation efficiency of the tower. Therefore, the ratio of the diameter of the tower to the filler should be specified, and the ratio D / d of the nominal diameter to the nominal diameter of the packing should be greater than 8.
2. Selection of structured packing specifications
Industrial commonly used regular packing model and specifications of many ways, the domestic custom with the specific surface area that is mainly 125,150,250,350,500,700 and several specifications, the same type of structured packing, the larger the surface area , The higher the mass transfer efficiency, but the resistance increases, the flux decreases, the packing cost is also increased obviously. Selection should be from the separation requirements, flux requirements, site conditions, the nature of materials and equipment investment, operating costs and other aspects of comprehensive consideration, so that the selected filler can meet the technical requirements, but also has economic rationality.
Selection of Filling Material for Integrated Wastewater Treatment Equipment
The material of the packing is divided into three categories: ceramic, metal and plastic.
(1) ceramic packing. Ceramic packing has good corrosion resistance and heat resistance, ceramic packing cheap, with good surface wetting performance, crisp, fragile is its biggest drawback. In the gas absorption, gas washing, liquid extraction and other applications are more common.
(2) metal filler. Metal filler can be made of a variety of materials, the choice of the main consideration of corrosion problems. Carbon steel packing low cost, and has a good surface wetting properties, for non-corrosive or corrosive substances should be given priority to use; stainless steel filler corrosion resistance, the general resistance in addition to Cl-common corrosion, but its cost Higher, and poor surface wetting performance.
(3) plastic packing. Plastic filler material mainly includes polypropylene (PP), polyethylene (PE) and polyvinyl chloride (PVC), etc., the domestic general use of polypropylene material. Plastic filler corrosion resistance is better, can withstand the general inorganic acid, alkali and organic solvent corrosion. Its good temperature resistance, long-term use in the following 100 ℃.