Case Study on the Renovation of the ESP Unit at GNDTP, Bathinda

Abstract

Most industries have smoke or dust problem of some kind. The smoke can be made up of solid or fluid particles suspended in the gas. For the control of dust, Electrostatic Precipitator is often used. Electrostatic precipitators are used to separate the suspended particles from the flue gases with the help of electric forces. Thesis consists of the complete study of the ESP unit at GNDTP Bathinda. Major problems with the existing system are that in the electronic controllers the current remains very high even when it is not required, causing huge power loss, stack emission level is high (300mg/NM3) and total plate area is insufficient to cope up with the dust concentration in the flue gases. In my thesis, it is proposed to renovate the existing system by installing Microprocessor based semi pulse controllers (MBSPC). MBSPC can save much more electrical energy than those using Electronic controllers. MBSPC monitors the actual EP current and fires the thyristors at precisely the correct phase angle to maintain the set spark rate or to increase the current to the set current limit if no sparking occurs. Also voltage is monitored. Set points can be adjusted as required and display of data can be seen at the panel. Proposal for the renovation of the existing unit has given by keeping in view the drawbacks in the existing system. Pay back calculations has also been calculated and from this it can be conclude that 72% power can be save and cost of renovation is nearly about 50 lac.With hourly saving of about 130 kwh the cost of modification is recoverable within about two and half years in the form of saving in power.