Hot Gas Candle Filtration
Hot gas filter candles with virtually no thermal shock, structure strength and wear resistance for multi applications.
Pollution Control Systems
Hot gas filters can form the basis for systems to remove all of the pollutants in emissions to atmosphere from incinerators, furnaces, kilns and other high temperature equipment.
Complete systems can comprise some or all of the treatment stages:
- afterburners, to complete the combustion of all the VOCs in the gas stream
- selective non-catalytic reduction, SNCR, to remove the nitrogen oxides, NOx
- proprietary gas coolers to cool the gas, typically from 850°C to 425°C
- dry scrubbing, by the addition of hydrated lime, to remove acid gases such as HCl and SO3
- hot gas filtration to remove solids and reduce particulate emissions to <5mg/m3
- hot gas filtration also to remove the condensed heavy metals
As per the executive summary below, only used in coal and biomass gas turbine based applications in order to protect gas turbines.
As a key component in advanced coal or biomass-based power applications, hot gas filtration systems protect the downstream gas turbine components from particle fouling and erosion, cleaning the process gas to meet emission requirements. When installed in either pressurized fluidized-bed combustion (PFBC) or integrated gasification combined cycle (IGCC) plants, lower downstream component costs are projected, in addition to improved energy efficiency, lower maintenance, and elimination of additional and expensive fuel or flue gas treatment systems. As a critical component, long-term performance, durability and life of the porous filter elements are essential to the successful operation of hot gas filtration systems in advanced combustion and gasification applications.
Over the past 30 years, significant advancements have been made in the development and understanding of the response of porous high temperature materials for use in future advanced coal fired systems. These achievements are directly transferable to technologies related to the development of ceramic turbine blades and vanes, catalytic combustors, as well as generation of advanced gas separation membranes for use in Future Gen applications.
Multiple Cleaning methods for iCerMaxTM
The following methods are recommended:
- Multiple reverse air or nitrogen pulse cycles. A cleaning by blowing compressed air through the filter cylinder from inside to outside. Pressure should be about 10 bar maximum. Repeat process several times – (This could also be performed during filtration process with hot air- excellent in thermal shock applications).
- Multiple treatment with water and pressure – Cleaning with water jetted pressure from inside to out, using a lance attachment (100-150 bar) and drying pores with compressed air.
- Acid bath treatment, immersed in nitric acid or hydrochloric acid in order to dissolve iron based contaminant. All metal housings to be dismantled and soaked in diluted acid for 8 hours, rinsing with water and drying by compressed air.
- High temperature incineration – Burning at high temperatures, up to 800°C – incinerating any organic contamination in ceramic pores.
- Sonic bath – Sonic cleaning is highly effective for deep cleaning.
The above methods can be repeated several times to extend the lifecycle of the ceramic candles.