CECO Filters
Table of Contents
Candle Filters
Sulphuric Acid plants
The absorption towers in Sulfuric Acid (H,SO,) plants almost always require fiber bed filters, which fall into two categories: impaction and Brownian diffusion. The process plant designer specifies what type is to be used in each tower.
Generally the factors that influence the choice of fiber bed filter are:
1) Collection/mist elimination efficiency for the expected particle size
2) Liquid loading at the inlet to the filters
3) Required outlet liquid loading limit
The velocities in a Brownian diffusion fiber bed installation are designed to be relatively lower in order to maximize the efficiency of acid mist removal, minimize pressure drop and minimize re-entrainment of acid droplets. At velocities above 40 ft/min (20 cm/sec), diffusion collection of fine particles drops off dramatically. At the same time, pressure drop through the fiber bed filter increases.
Chlor Alkali plants
Fiber Bed filters are utilized in several aspects of the Chlorine manufacturing process. Typically chlorine is manufactured in electrolytic cells which decompose brine. From the cells Chlorine (CI) gas and Hydrogen (H,) gas are released. The Chlorine gas stream goes through a separation stage to remove entrained brine and salt particles. The final step of the separation is the wet Chlorine fiber bed filters. Their purpose is to prevent the drying tower from plugging with NaCl and to remove water from the gas stream in order to reduce Sulfuric Acid consumption in the drying tower. For this service fiber bed filters are used with high-efficiency glass fiber and cages fabricated from FRP or Titanium.
Next the gas stream goes through the drying process, also known as the dry Chlorine stream. This is accomplished by the injection of Sulfuric Acid which hygroscopically removes water from the gas stream. Sulfuric acid is thus entrained in the drying tower and the compressor (in liquid seal type processes). Fiber bed filters are installed downstream of the drying tower and/or liquid seal compressor to collect Sulfuric Acid so as to improve product purity. For this application fiber bed filters with high efficiency glass fiber media and 316L Stainless Steel cages are used.
Mist Eliminators (CECO Filters)
CECO Filters designs and manufactures fiber bed mist eliminator systems used to abate corrosive mist and oil droplets from industrial air and gas streams. CECO Filters builds custom and standard styles of fiber bed mist eliminator systems. We provide added value services to our clients, such as repacking services, consultancy, and testing.
CECO Filters’ Mist Collector Systems are used extensively by companies seeking to reduce emissions and opacity issues to create a safer environment in a variety of industrial applications.
Each Mist Collector System is engineered to remove/clean contaminated gas streams and reduce emissions to give clean air quality, reduced stack visibility/opacity, efficient processing, product purity and meet environmental output regulations. CECO Filters values customer feedback and as a result, we work closely with our clients to find them the right solution. Understanding the issues and expectations allows us to tailor the design to the customer-specific requirements.
Meshpad Mist Eliminator
CECO filter system technologies are used to remove mist emissions or liquid contaminants from process gas streams to give clean gas outputs.
Meshpad demister is fabricated by knitting a fine metal wire into a mist-eliminating device. Meshpad mist eliminator will coalescer smaller liquid droplets into larger sizes that would then fall out by gravity, resulting in dryer gas.
