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The design of the flushing system
The spray nozzle of flushes is the most important executive component in the WFGD system.Regarding each section spray nozzle, we carries on the feasibility analysis before project application, carries on the distribution analysis of spraying, the impulse survey of spraying, the bubble size analysis of spraying, the measurement of angle of spraying and the material wear test in the simulation environment, through the establishment mathematical model chooses the injection pressure and the spray angle of the spray nozzle, as well as the neighboring spray nozzle best spacing, to achieve the most superior flushing effect.
When the hydraulic pressure of the flushing excessively is low, the flushing effect is bad, easy to have the scaling phenomenon; When the hydraulic pressure of the flushing excessively is high ,it’s easy to increase the mist including water, and reduce the corrugated plate the service life.The hydraulic pressure of the flushes should be decided by the characteristic of the spray nozzle of flushes and the flushing spray nozzle between the mist eliminator distance (is generally 0.4~0.8m) and so on the factor.In the ordinary circumstances,the flushing hydraulic pressure of the first level of mist eliminator should be higher than the second level of mist eliminator, the flushing hydraulic pressure of windward side of the mist eliminator is higher than the running free surface of the mist eliminator. Sometimes in order to save the cost, simplify the control system, also often selecting the basic same flushing hydraulic pressure (≥0.2MPa).
The flushing coverage fraction refers to the cover degree of the wash water to the mist eliminator cross section.According to the different operating mode condition, the flushing coverage fraction selected 100%~300% generally. It is essential guarantee not to leave leeway absolutely , otherwise it is extremely easy to create the scaling phenomenon. Under the generic condition, the periphery flushing strength of the projecting plane of the spray nozzle spraying to be weak , it should be considered that the certain degree flushing to overlap, guarantees the good flushing effect.
The mist eliminator flushing cycle refers to the time-gap which the mist eliminator each time flushes. The flushing is not suitable frequently, otherwise can cause the mist including water quantity aggravation; Simultaneously the flushing gap not to be long, otherwise it is easy to have the scaling phenomenon.
The mist eliminator flushing cycle is mainly determined by the flue gas characteristic and the absorbent condition, should not surpass generally for 2 hours.
On the one hand the mist eliminator flushing water volume should satisfy the request of the mist eliminator own flushing effect, on the other hand also consider the request of the system level balance.Sometimes it needs to use the great water volume short-time gate pulse to wash, sometimes wants the small water volume long time flushing, the flushing water volume to be possible specifically to determine by the operating mode condition.
The installing scene of the mist eliminator flushing system
Each kind of spare part of Mist eliminator system