Fabric Filter Gas Flow Damper for Low Particulate Emissions
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Solution Overview
Problem
Commercial fabric filter systems experience higher particulate matter emissions during the period from filter bag cleaning until dust cake formation on the surfaces of filter bags, leading to reduced filtering efficiency and increased emissions.
Innovation Solution
A fabric filter system equipped with a gas flow damper system that controls gas flow velocity through each fabric filter chamber, using movable damper panels adjusted by a control device based on timer, pressure, and temperature measurements to maintain effective particulate matter collection during cleaning and dust cake formation periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter bags are cleaned by compressed air pulses to remove dust cakes, then filtering efficiency is restored, but particulate matter emissions increase during the period from cleaning until dust cake reformation
Solution Approach 1:
The system performs preliminary actions by slowly building up dust cakes through controlled operation before normal high-velocity filtering begins. This preliminary dust cake formation occurs during a transition period after cleaning, preparing the filter surface for effective particulate matter capture before full operational load is applied
Solution Approach 2:
The system dynamically adjusts gas flow velocity through dampers during different operational phases. Gas velocity is reduced during the transition period after cleaning when dust cakes are forming, and increased during normal operation when dust cakes are fully formed and providing effective filtration
2Productivity
If gas flow velocity is increased to maintain productivity, then output is improved, but particulate matter emissions increase during the transition period from cleaning to dust cake formation
Solution Approach 1:
Gas flow velocity is dynamically adjusted based on the operational phase. During the transition period after cleaning, velocity is kept low to allow dust cake formation. Once dust cakes are established, velocity is increased to maintain high productivity while the dust cakes provide effective filtration
Solution Approach 2:
The system allows a preliminary period at reduced gas velocity following cleaning to enable dust cake formation. This preliminary action ensures that dust cakes are properly formed before high-velocity high-productivity operation begins, preventing emissions during the transition
Data Source
Figure 1
AI summary
A fabric filter system (26) useful for filtering a polluted gas to achieve a cleaned gas with a relatively low particulate matter content, including during a period of time from fabric filter bag (32) cleaning up until dust cake formation on the fabric filter bag (32). For such purpose, the subject fabric filter system (26) is equipped with a polluted gas flow damper system (100) to control polluted gas velocity through the fabric filter system (26), particularly for a relatively reduced polluted gas velocity during the period of time from fabric filter bag (32) cleaning up until dust cake formation on the fabric filter bag (32).