Application: Study & recommendation of suitable design of filter bags to improve the overall performance of hybrid type bag house system in order to achieve :
Major Challenges and problem identification:
- Pressure drop below 1500 pa
- Emission ≤ 30 mg/Nm3
The customer was not prepared to go for higher quality of filter bags than the existing quality and was looking for filter bags made from 100% PPS fibers due to cost competitiveness over polyamide combination filter bags.
Oxidation on filter media causes reduction in its tearing strength. Improvement in filtration efficiency of filters bags and reduction in clogging of filter bags was also a major problem.
It was difficult to achieve desired performance by using 100% standard design of PPS filter media. Now the task was to optimize filter bag designs without compromising on quality and marginal impact on cost.
Innovations for problem identification and implementation of solution:
The Masturlal Fabrichem team visited the site and studied the operating condition of the bag house and also carried out an analysis of used filter bags for physical properties. Advanced analysis was arranged at our principal laboratory facility and it was found that chemical degradation had occurred in the filter media properties specially the tearing strength of the filter media due to the oxidation effect.
After thorough analysis of the existing quality of filter bags, operating condition and cost constraint, Masturlal Fabrichem developed filter bags made from a combination of standard fiber with micro fine and trilobal fibers to improve the filtration efficiency and also to ensure minimal clogging in filter bags which was due to filter media structural design.
To reduce the effect of oxidation on filter media, we recommended to pre-coat the filter bags with precipitated homogenous calcium carbonate to form uniform protective cake on collection side of filter bags. We also recommended pre-coating after long shutdowns.
All filter bags were installed in the presence of our service team accompanied by a customer representative to ensure quality of installation.
After start-up, the cleaning cycle was optimized according to DP mode and now the system is running successfully with the desired performance parameters.