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Chlorine By-Pass System
The process of stabilizing the total cement manufacturing process by bypassing before partially (1-5%) adding chlorine substance that causes problems such as blockage of pre-heater during the cement manufacturing process is called chlorine bypass (CL BY-Pass).
The heat efficiency of the cement kiln must not be deteriorated. Therefore, the ratio of added kiln flue gas must be minimized, the piled up dust minimized and removal efficiency of chlorine increased. The dust with high chlorine concentration must be handled effectively.
For the location of by-pass probe, a place with the highest concentration of volatilized chlorine and small amount of dust scatter must be selected. The bypassed gas protects the front of the probe and to prevent internal coating, it is mixed with cooling air that enters in the tangent direction of the probe to enter as a coal allocation cyclone.
The chlorine substance of gas that has been bypassed is quickly cooled in the probe and is coagulated as a small KCI crystal before being enriched in the particle part of the by-pass dust. Therefore, the big particle part with a small chlorine concentration is separated and recovered and if the small particle part with a high chlorine concentration is emitted, the chlorine removal efficiency can be increased. This can also decrease the occurrence of the ultimate dust.
Since the separated big particles are sent back to the kiln in high temperatures, heat loss can be reduced by installing chlorine by-pass system.
|lassification||Waste Processing||Cement Processing|
|Process Property||Mechanical Processing||Waste collection –> grinding –> mixing||Waste collection –> grinding –> mixing|
|Heat Processing||Combustion/heat decomposition||Preheating –> plasticity (combustion/heat processing)|
|Processing After Cooling||Cooling –> Ash –> laying/solidification||Cooling –> clinker –> fine grinding -> cement|
|Equipment Management Standard||
By taking out some gas of the kiln from the probe, the gas is quenched by the cooling air to below the coagulation point and is also bypassed at the same time.
Coal that contains comparatively low concentration chlorine (in the flue gas added in the kiln) is recovered and reentered in the kiln. Other high temperature flue gas is sent to the heat exchanger or the boiler.
Heat Exchange or Boiler
The flue gas that has passed cyclone has removed the comparatively bigger particle, but the smaller particles are left inside the flue gas. To remove this, bag filter must be used. If temperature is too high, the bag cannot tolerate it, thus temperature must be lowered through heat exchange. Here, boilers are installed to use the exchange heat.
The flue gas that has passed the heat exchanger or the boiler passes the dust collector to pile up smaller particles. The piled up particles are re-used or disposed of.
It is a storage tank that temporarily saves the small particles piled up in the bag filter for reuse during or before disposal.