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ICESP X CONFERENCE PAPER ABSTRACTS 3A 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 3A Series papers from the X ICESP Conference.  

3A1
ELECTROSTATIC PRECIPITATOR PERFORMANCE IN INDIAN
PULVERIZED COAL BASED THERMAL POWER STATIONS - PROBLEMS AND SOLUTIONS
PRADIP KUMAR MANDAL AND TANUJ KUMAR

Abstract

Coal used in Indian thermal power stations is of inferior grade having low heat value and high ash content due to drift origin. However, Indian power coal ash is specially known by its refractory in nature and low sulphur (below 0.5%) and alkalis (less than 1.5%) contents. Due to presence of low sulphur and alkalis and consequently having very high ash resistivity (1012 1014 O cm) it is difficult to achieve good E.S.P. performance. Majority of Indian thermal power stations have E.S.P. for ash collection. 

In the present paper various attempts have been made to analyze the causes of problems in terms of the chemical constituents of ash, resistivity, conductivity, etc. A special emphasis was given to correlate the different forms of sulphur (organic, pyretic and sulphate sulphur) on E.S.P. performance. The total sulphur can not predict the E.S.P. performance; it is the forms of sulphur that decides the performance. Organic sulphur in coal mainly improves the ash resistivity through SO3 adsorption from flue gas whereas pyretic sulphur is responsible for slag and clinker formation in the boiler and evacuated through bottom hoper as bottom ash in dry bottom furnace.

In addition, the paper deals with the concept of predicting ash resistivity based on conductivity measurement of ash - extract which may help to take necessary action for improvements of E.S.P. performance in thermal power stations. The paper also discusses the remedial measures to be taken in terms of use of additive (sodium / sulphur based) or biomass like horticultural waste having high alkalis (4 6 %) for blending in appropriate proportion with coal depending on characteristics.



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3A2  
ELECTROSTATIC PRECIPITATOR PERFORMANCE WIT CHINESE COALS
LENA LILLIEBLAD, TOBIAS JOHANSSON1 AND KJELL PORLE

Abstract

The electrostatic precipitator (ESP) performance is sensitive to fly ash properties. The ESP size and design for a new installation has to be carefully selected based on coal and coal ash data together with operating conditions. Experiences from similar installations are utilized as base for new ESP sizes and for upgrading of existing ESP's. 

Chinese coals are now often seen in specifications for new plants together with other export coals from e.g. Australia, South Africa and Indonesia. In China new ESP's are built and existing ESP's are upgraded to encounter an increased power demand and comply with more stringent emission requirements. Knowledge about the properties of fly ashes from Chinese coals is necessary to provide a good basis for ESP performance predictions. Mineral analyses and laboratory combustion studies were made for selected Chinese coals to provide deeper knowledge about ash properties, which are of importance for the ESP operation. 

Some Chinese coals are characterized by high aluminum contents in the ash compared to other commonly used coals. These coals often generate back-corona conditions in the ESP. A high content of aluminum in comparison with silica indicates high contents of minerals like kaolinite and aluminosilicate, which often have fine mineral size distributions in the coals. Sodium and iron are generally known to be beneficial for the ESP operation. In some Chinese coals more sodium and iron are associated with aluminosilicates than for non-Chinese coals. The influence of sodium and iron on ESP performance is certainly dependent on in which form sodium and iron occur in the coal.

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3A3  
INDUSTRIAL DEMONSTRATIONS OF A THREE-PHASE T/R POWER
SOURCE WITH COAL FIRED POWER PLANTS
RONGHUA WANG AND KEPING YAN

Abstract

This paper describes a new three-phase T/R power source together with its automatic voltage controller. Since May 2005, the power sources have been applied in two Chinese 125 MW coal fired power plants. Six months industrial demonstrations indicated that in contrast to conventional single phase T/R, the three-phase T/R can significantly increase the corona current. The voltage ripple is around 3-5% only. Meanwhile, its power factor is around 0.9. By using the new AVC, upto 60% of electricity consumption can be saved.

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