Pulverizer housing or burner lines are glowing red; Mill fires require immediate attention to prevent damage to the pulverizer and more damaging mill puffs. Explosions in a pulverized coal system are normally called puffs. A mill puff is an explosion in the mill system caused by an explosive combination of coal, air and temperature.
The pulverized mixture then travels downstream towards a baghouse, generally located outdoors. To protect the baghouse and isolate the inlet ductwork from a combustible dust explosion, standards panels such as the REMBE ODV and EDP can be utilized. An example of this can be seen in Figure 1 above.
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In practice, a fire occurring during normal pulverizer operation does not result in an explosion. The rich coal/ air mixture has been shown to absorb the heat of the ignition source without igniting, and therefore it often produces no deflagration. The fire can be extinguished and the system brought off the line safely.
Feature: Coal Pulverization System: Explosion Prevention and Process Control 2. Explosion prevention and protection Principle of dust explosion prevention and protection has been introduced by Eckhoff 4. The main methods used in this system include atmospheric inert ing, powder inerting and venting. Process
The pulverized coal handling system also depends on the overall configuration of the plant and can be: Centralized, where the fuel treatment is done on a centralized basis for all burners on the plant, and of a unit type, where each burner has its own pulverizer system.
What is claimed is: 1. A pulverizer mill protection system comprising: at least one pulverizer mill comprising: an inlet opening formed in an upper wall of the mill for receiving solid fuel therethrough, a classifying element positioned within the mill for classifying the solid fuel, wherein a classifier zone is defined by an area between the classifying element and the upper wall ...
with pulverizer design, and even seems to be somewhat proprietary among manufacturers. Obviously, the proper minimum velocity is that which provides continued fuel through put while rejecting the majority of legitimate pyrites but very little fuel. Once again, field test at low pulverizer load will determine what needs to be done.