HOT GAS FILTER SYSTEM WITH SAFETY FILTER ASSEMBLY AND PRESSURE PULSE CLEANING

摘要

Accordingly there is provided an improved hot gas filter system in which a safety filter made of sintered porous ceramic is mounted on the main ceramic filter by means of at least one high density ceramic gasket seal within a secure filter holder assembly. Such a safety filter is more porous and does not interfere with the normal filtration process by the main filter. In a situation of failure of the main filter due to breakage, the dusty gas passes through the safety filter and the dust quickly clogs the pores of the safety filter due to its deep bed filtration characteristics. The clogged safety filter does not allow the dust from the broken main filter to mix with the clean gas and thus protect the turbine and downstream components due to particle damage in the event of a main filter failure. This porous safety filter also modulates the pressure pulses during the cleaning cycle to output a higher and uniform cleaning intensity along the length of the main filter element because the porous safety filter is placed directly above the main filter and thus the dust on the main filter is dislodged with lower pressure pulse requirement.