03-08-2012, 03:57 PM
ERECTION MANAGEMENT SYSTEM FOR ELECTROSTATIC PRECIPITATOR (ESP) – WRITE UP
ERECTION MANAGEMENT SYSTEM FOR ELECTROSTATIC PRECIPITATOR.doc (Size: 238.5 KB / Downloads: 68)
BHEL a navaratna Public Sector Enterprise in India is involved in the Supply, erection and commissioning of equipments of Thermal power plants predominantly in the country and abroad. The current demand o the market is to install and commission power plans in the minimum possible period. Towards this the Erection methods and latest Erection techniques are applied with latest project management systems for quick erection.
Across the country the equipments are manufactured in 15 manufacturing centers of BHEL. These are getting installed in various places in the country.
60- 70% of the power in the country is through the 210/200MW power plants supplied during the late 80’s. All these plants are due for up gradation as part of Life Enhancement activity as per Central Electricity Authority (CEA) of India.
This modification / retrofit of the old plans has to be done in the minimum possible time as long shut of units will affect generation. One equipment of the power plant is Electrostatic Precipitator (ESP). This contributes to the ash collection and letting pure gas out to the atmosphere. The earlier power plants were designed for higher emission levels. To meet the current emission norms of the pollution control boards the ESP retrofit in a plant is picking with utmost priority.
BAP is manufacturing he boiler auxiliaries namely ESP, Fans, Air Preheater. Currently BAP is involved in retrofitting of ESPs in various places in the country. The retrofit has to be done in short time to meet the market demand.
One of the approach towards this is to develop an Erection Management System. This system will be used to monitor the suppliers of the various parts as required sequentially at site.
• The development involves
• study of the equipments involved
• understand the nature of its location at site
• Learn the critical process involved in the supply of the equipments
• develop a software for sequential supplies
• Integrate with the available system in the unit.
• The developed system will be used for other BAP products namely Fans & Air Preheater.
The system will also trigger the associated agencies to take appropriate actions to take care of the supply pitfalls. This will help the Erection series to do the Erection in time and complete projects as per customer commitments. The parts of the ESP in general is as below.
4.ESP
Electrostatic Precipitator (ESP) is one of the Boiler Auxiliaries in a Thermal Power Plant. The ESP equipment is a Pollution control equipment. The dust particles which is the waste output of the Thermal power plant will be allowed to pass through a number of pair of Negative and Positively Charged plates by means of feeding high voltage DC in between the plates. While the particles pass through these plates they get charged and get attracted to the opposite plates by means of the principle of Corona Discharge. The accumulated dust over a period of time is brought down by means of agitating the Plates. The ash from the down part of the ESP will be taken out of the plant through conveyors and the clean gas out of the ESP will be let out to the atmosphere through a Chimney. The ESP is picked up wide importance in the Steel, Cement & Sugar Industries apart from thermal power plants.
5.Electrics of ESP
ESP Charging is being done by means of High Voltage Transformers which are usually kept on the roof of the ESP. The High Voltage transformers houses High Voltage Rectifier, Diode Stack and the associated Electrical equipment like power disconnect switches and the necessary indicating instruments of any Transformer. The controls of the Transformer will be done by means of a thyristor control panel which will be housed in a AC control room. This technology is being followed by various manufactures all round the globe. Presently cost economics is playing its part in all walks of life including the technical products irrespective of its efficiency and social benefits.
Power Plant General layout