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ICESP X CONFERENCE PAPER ABSTRACTS 6C SERIES

Held in Cairns, Australia
June 25 - 29, 2006

The International Conference on Electrostatic Precipitation (ICESP) is the official conference of the International Society for Electrostatic Precipitation (ISESP).  

The following is a list of the Abstracts for the 6C Series papers from the X ICESP Conference.  

6C1
FABRIC FILTERS FOR COAL FIRED POWER STATIONS

P.W. BOWDEN, M.J. NEATE, B.M. CURRELL AND M. GERAKIOS

Abstract

Over the last 30 years there has been a significant increase in the use of textiles in coal fired power stations in Australia, Republic of South Africa, China and United States of America. When coal is burnt in a power station approximately 30% of the weight of coal evolves as fly ash particulate emission which must be prevented from passing to the atmosphere.

The paper discusses the use of different fibre polymers and yarn types used in filtration media for filter bags. Woven and needled punched fabric structures have developed to achieve low emissions, high air flows and extended life.

The paper also discusses the current technology and a perspective on the new emerging trends in fabric filter bags in coal fired power stations.

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6C2 
EXPERIENCES IN BAG HOUSE APPLICATIONS AFTER COAL FIRED BOILERS
ALEXANDER KLOTZ AND BERND HAUG

Abstract

BWF Envirotec is the world-wide technology leader in industrial dedusting with textile filter materials based on synthetic fibers and scrims. The delivery program comprises a wide range of ready-made filter media, accessories for dust collectors as well as on-site installing and replacements. BWF Envirotec also offers services, such as filter media recommendations, laboratory analysis of filter media and dusts and the simulation of complex dust removal processes.

BWF Envirotec filter bags have successfully been applied in numerous power plants. In recent years, there has been an increasing demand because more and more electrostatic precipitators at power plants are replaced by bag houses. Reasons for this are stricter emission laws and the high effectiveness of these systems but also - especially in Europe - because of the necessity to install desulphurization systems in order to control the output on SO2.

This means that bag filters in power plants are used to separate dust and where applicable to neutralize harmful acid gases. Here, combustion residue and any harmful substances contained in the additives are separated on the surface of the filter bag, so the filter material is exposed to heavy mechanical, chemical and thermal stress. Consequently, the choice of the appropriate filter medium is of major importance in these applications.

In the last decade, BWF Envirotec installed more than 1 Mio m² of filter media for the dedusting of power plants. Our comprehensive experiences in filtration with textile filter bags, as well as some case histories will be presented to the auditors of this conference.

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6C3 
APPLICATION OF FABRIC FILTER TO COKE OVEN
NAOYUKI OHASHI AND KAZUAKI TAKAFUJI

Abstract

To prevent atmospheric diffusion of smoke and dust contained in flue gases, a fabric filter is generally installed in coke ovens in Japan. However, since such dust has a very small particle diameter and consequently is difficult to remove, the pressure loss of the fabric filter increases. This study examined how to decrease the pressure loss of a fabric filter using actual flue gases from a coke oven. The relation between the pressure within the filter cloth and the acceleration during pulse was also reviewed along with the effect of an agent on the pressure loss to find an optimum pulse method. As a result, the specifications of the optimum pulse system at the pulse pressure of 0.6 MPa were clarified together with the effect of an agent. The optimum system was then introduced to an actual system, which is currently operated with the pressure loss kept within the permissible range.


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6C4 
REVERSE-GAS BAG HOUSE MODELING AND COMPLETE OFF-GAS
SYSTEM SIMULATION
FLORIN POPOVICI PR. ENG.M. Sc. Eng. (Mechanical)

Abstract

This paper describes the approach followed by Beier Albany for the design of a negative pressure reverse-gas bag house associated with a Silicon / Ferro Manganese furnace. Each relevant component of the bag house and the gas exhaust system was modeled and used for the compilation of the static model of the entire process. The static model became the baseline for the simulation of the “real time” or transient system operation. These modeling tools are critical for the design of bag houses, assessment of flow, temperature and pressure distribution and optimization of the control philosophy for off-gas systems.

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