High speed fiber ball filter applications - Fiber Ball Filter - Filtration and Separation Industry

High speed fiber ball filter applications - Fiber Ball Filter - Filtration and Separation Industry

Abstract: This paper describes the characteristics of the filter fiber ball, working principle and its water desalination plant in the Application.

Modern large-scale water desalination plant, in order to take full advantage of a desalination Yang resin exchange capacity, we must control access to a cation exchanger content of suspended solids in raw water, or less than 2mg / L. Lanzhou Petrochemical Company desalination water plant is a factory blue Ethylene Expansion Project in supporting the project. The process of water process control automation using PLC. The device was put into operation the first quarter of 1996, has been running six years, the indicators are in line with the design requirements. This raw water pretreatment system for its fiber filters for the ball to introduce.

1 Equipment Selection Water desalination plant in the raw water taken from the Yellow River Water filtered water supplied by the clarification. Water pressure 0.3 ~ 0.4MPa (G), the normal content of suspended solids in raw water was about 5mg / L, the flood season up to 8mg / L or more, for the protection of Yang resin is not contaminated raw water into a desalination cation exchanger must be preprocessed before, so that suspended solids content of less than 2mg / L.

Raw water pretreatment plant production capacity of normal water to 310t / h, a maximum of 360t / h. Pretreatment equipment is used conventional mechanical filter, or use a newly developed fiber ball filter, all parties participating in the construction of great concern.

Fiber ball filter is developed by Tsinghua University, the early 90s a new water filter. The main advantage of filter raw water through filters to filter the high speed, the best filtration rate 25 ~ 30m / h, when the filtration velocity of 30m / h, can ensure a stable water quality. Treatment of water, 360t / h, if the election towel 3m filter, which sets the number of 2 units.

Limited land under this project (mechanical filter needs 5 sets), the investment characteristics of tension, although the lack of towel 3m fiber ball filter some of the operational data, but can draw on existing domestic towel filter relevant experience 2m then take some appropriate measures, should meet the needs of this project. Therefore chose 3m in diameter with two fiber ball filter to run parallel programs.

2 fiber ball filter characteristics and working principle

Fiber ball filter body fills a height of about 1.2m of polyester fiber ball as filters, filter the raw water from the upper part of the equipment, the water particles through the filter layer, jelly and other suspended material retained on the filter layer in the upper by the filter layer from the bottom out of the effluent suspended solids less than 2mg / L, in order to ensure a stable operation of desalination water plant.

Polyester fiber ball filter has good flexibility, density, compressibility and porosity, the characteristics of the filtration by the working pressure, the upper cut-off filter mud and weight of white, forming a layer of Panasonic dense distribution of the ideal filter state, fiber ball with its great surface area and porosity than the absorption and retention of suspended particles in water, give full play to the ability to filter sewage interception deep; for easy backwashing, so low since the water; also resistant to abrasion, chemical stability strong advantage; when the filter media by serious organic pollution, but also easy to use chemical cleaning of regeneration. Fiber Ball Filters work steps into normal production of water and backwashing, bulk flow chart shown in Figure 1.

2.1 normal water production process

Open water control valve XV. XV 3601 and a 3602 water control valve, other control valves are turned off; XV. 3601 The opening is set water pressure (PIS8001) value determined. Set the water to drive debugging pressure 0.33MPa (G); water control valve XV. 3602 The opening of water flow from the production (FIQ813) determined. To avoid too high filtration rate caused by transmission through the filter occurs, causing decreased water quality, filtration rate should be controlled to maintain security and stability of long-cycle production, the maximum filtration rate of not more than 30m / h better.

Line determination of the water as suspended solids content of the more difficult, according to the import and export filters filter water pressure as the upper layer of retained material increases gradually increasing the characteristics of the corresponding water content of suspended solids with pressure drop increased by more than a small change; weekly initial pressure of running for the 0.02MPa, when the pressure increased to 0.15MPa, the measured water content of suspended matter 2mg / L, for this to determine the water pressure out of reach 0 .14 MPa, the filter automatically stops water production, and into the backwash process.

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