Backwash spray nozzle for granular filter material filter device

Abstract

The invention relates to a backwash spray nozzle for a granular filter material filter device. The backwash spray nozzle comprises a connecting head, a cylinder body, nozzles and a base plate, wherein an upper ring connected with the connecting head is arranged at one end of the cylinder body, the base plate is arranged at the other end of the cylinder body, a cone head is arranged in the base plate, and 1-3 rows of nozzles are arranged on the cylinder body; 6-18 nozzles are arranged in one row, central angles alpha between every two adjacent nozzles in each row are equal, the nozzles in different rows are arrayed in a staggered manner, and staggering angles are equal to (1 / 2)alpha. In a use process, the spray nozzle is mounted at the bottom of a filter layer, a high-speed water inlet pipe and a high-speed air inlet pipe are communicated with each other, gas-water mixed liquid is ejected at high speed in a radial manner to drive peripheral filter materials to be diffused outwards at high speed to form three-phase flow of the gas, the water and the filter materials, the gas with the least specific gravity rapidly floats to penetrate through the whole filter layer due to a buoyancy effect, the three-phase flow is transversely and longitudinally covered, the filter materials are locally collided, rubbed and stirred with one another, and the three-phase flow transmits the energy to the periphery, so as to realize the effective backwash and regeneration of the whole filter layer. The backwash spray nozzle is simple in structure and good in backwash effect and is convenient to use.

Description

technical field [0001] The invention relates to a backwashing nozzle used for a granular filter material filter device and a use method thereof. Background technique [0002] Granular filter material filter is a sewage filtration equipment developed in China in the middle and late 1980s. Granular filter materials such as walnut shells, anthracite, quartz sand, corundum, magnetite, garnet, activated carbon, etc. are suitable for sewage filtration. filter material. For example, a common filter device that uses walnut shells as granular filter materials is a vertical steel circular container structure. The tank is filled with walnut shell filter materials. Oily sewage enters from the top and is filtered from top to bottom. The rear water drains from the bottom. After the granular walnut shell filter material is polluted, it is regenerated by backwashing. The backwash regeneration method is divided into clean water entering from the top or bottom of the filter, flushing the f...

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Problems solved by technology

However, mechanical agitation and scrubbing for backwashing of the filter material will make the particle size of the granular filter material smaller, the filter material will be lost, and the loss will be large. It is necessary to frequently replenish the lack of granular filter material. At the same time, mechanical agitation and scrubbing also exist. In the blind area of ​​backwashing, the granular filter material used for a long time is easily stuck together or compacted by oil stains without being washed, which affects the use effect of the granular filter material

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