In industrial production, the circulating cooling water system runs through some production units or equipment, using water as the cooling medium to circulate, which saves a lot of water resources while protecting the normal operation of the waste heat exchange equipment.
Generally speaking, three types of problems mainly exist in industrial circulating cooling water systems due to unstable water quality, namely metal corrosion, equipment surface scaling, mud deposition and microbial breeding. And these three do not exist in isolation, are interrelated and influence each other, such as scale and dirt are often combined together, scale and biological mud can cause or aggravate corrosion. These scale, corrosion and biological slime bring serious harm to the safe operation of the equipment.
Comparison of shallow sand filter and traditional sand filter equipment
There are many inconvenient places in the use of traditional sand filters, such as a large area, installation and maintenance is very inconvenient, backwash water consumption, backwash sand, usually not clean. So it's being phased out.
95% of the suspended matter filtered in the traditional sand filter is concentrated in the upper layer of the sand filter 15cm~25cm, and the filter layer thickness of the traditional sand filter is more than 80cm. The full automatic shallow sand filter layer is only 40cm, and the backwashing makes full use of fluid mechanics, which enhances the backwashing intensity. At the same time, the design of the ball also makes the filtering smooth, the backwashing does not run sand, and the filtering phenomenon does not appear. Make up for the traditional sand filter backwash is not clean, installation and maintenance is not convenient, backwash water consumption and other shortcomings.
Features of fully automatic shallow sand filter
1. Large filtration water, good filtration effect
The automatic shallow sand filter is composed of standard unit sand cylinder, with large filtering water, and the processing capacity of a single tank ranges from 15m³/h to 500m³/h, which can be selected according to specific working conditions. Filter backwash using product water, and without booster pump and backwash pump; Backwashing time is 2-3min, backwashing water <3m³. The shallow sand filter adopts a modular design with multiple filter units available depending on the flow rate.
2. Automatic backwash
Automatic shallow sand filter backwashing is automatically identified and controlled by an intelligent control system without manual intervention. Even if the suspended solids in the water fluctuate, the equipment may automatically adapt.
3. Cloth and water collection devices are adopted
Due to the water distribution system of the filtration system and the very uniform distribution of the water collector, the water flow in the whole filtration process is stratified, the sand bed plane is always smooth in the filtration process, and the effluent quality is stable.
4. Use refined quartz sand or garnet as filter medium
According to the water quality to choose, quartz sand or garnet as a filter medium, filter particle size up to 0.16mm.
5. Long-term operation cost is low, save electricity, save water
Power saving: The system has an automatic backwashing valve. The backwashing of the sand filter tank is not carried out simultaneously, but under the normal operation of the system, the backwashing one by one takes turns. There is no need to consider setting the backwashing pump.
Water saving: The system because of its hydrator and water collector, unified specifications tank, so that the backwashing does not need compressed air to make the medium layer is very uniform expansion for backwashing. Backwash water used is filtered clean water, so the consumption of backwash water is small. (The backwash water consumption is less than 1% of the filter flow, and the backwash water consumption is about 30% of the traditional sand filter).
6. Flexible and convenient installation
Can be indoor or outdoor layout, easy installation, do not need special foundation, general cement ground can.
Effect of automatic shallow sand filter on circulating cooling water
1. Remove suspended matter and particulate matter in circulating cooling water to reduce the turbidity of water.
2. Remove organic matter, bacteria and mud in circulating cooling water, and reduce the clogging rate of cooler.
3. Remove rust and other corrosion products in the circulating cooling water pipeline to reduce the amount of sewage discharge.
4. Improved heat exchange efficiency. Because suspended solids are usually deposited in parts of the system with low flow rates, such as between the pipes of water coolers, the heat exchange efficiency of the equipment can be improved if some of the suspended solids are removed by adding circulating water side filtration equipment.
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