What is an Electrostatic Precipitator?Electrostatic precipitation is a method of dust collection that uses electrostatic forces, and consists of discharge electrodes and collecting plates. A high voltage is applied to the discharge electrodes to form an electrical field between the discharge Electrode and the collecting plates, and also ionizes the gas around the discharge electrodes to supply ions. When gas that contains an aerosol (dust, mist) flows between the collecting plates and the discharge electrodes, the aerosol particles in the gas are charged by the ions.The Coulomb force caused by the electric field causes the charged particles to be collected on the collecting plates, and the gas is purified. This is the principle of electrostatic precipitation, and Electrostatic precipitators apply this principle on an industrial scale. The particles collected on the collecting plates are removed by dislodging by rapping the collecting plate
Salient Features of V T Corp's ESP:
- Specially Designed X – Type Gas Distribution Plates for Even distribution of the incoming gas flow throughout the cross section of the precipitator and to reduce the overall pressure loss to optimum level.
- VT CORP casing and supporting structure are designed to withstand various temperature and pressure conditions. VT CORP designed supporting structure made from sectional steel consist of a system of fixed and movable supports, which permits compensation of the thermal expansion of the casing.
- Optimization of the Discharge and Collecting System by VT Corp design VT-240 Collecting Electrode and Discharge Electrode Type Emitron-15, Emitron-0 & Star Electrode.
- Effective Mechanical Rapping Mechanism for Collecting Electrode, Discharge Electrode and Gas Distribution Plates.
- Microprocessor based HVR Control system offers quicker and differentiated response to changes in the prevailing electrical conditions in the precipitator.
Some of the applications for electrostatic precipitators:
- Power and production plants for cement and limestone (Mills, Kilns and Coolers)
- Coal and oil-fired boilers, coal mills and coal driers.
- Power plant boilers in power generation plants.
- Co – gen plants in sugar and pulp and paper industry.
- Biomass fired boilers in renewable energy industry.
- Various exhaust applications in steel processing plants.
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Single Field ESPSingle field ESP is ESP with only one field (Normally ESP has more has 2 or 3 field). Internal arrangement is same as regular ESP i.e.Rows of collection electrode and discharge electrode with their respective rapping systems.
This is ideally used for application like a palm oil mills where the flue gas pass through multicyclone, due to coarser particles are removed and only the final particle is required to be treated in ESP. The dust burdens are very low, hence this single field ESP are used in such applications.
Applications of single field ESP
- Inlet dust burden is very low i.e. 500 to 700 mg/Nm3
- Coarser particles are already collected in cyclone/dust collector prior to entering the ESP; hence ESP has to handle only finer particles.
- Currently Outlet emission required is only 150mg/Nm3 and in palm oil mills (Inlet dust burden is 700mg/Nm3) which is approx. 80% efficiency of the ESP in worst condition and 70% efficiency in normal condition.This requirement is far lower than standard requirement of 90% efficiency per field
Special DevelopmentAs there are no coarser particles and dust burden is very low, the concentrated current from the discharge electrodes is not be required . Hence V T CORP developed Star type electrodes for such applications which discharges uniform current distribution to capture the fine dust from the Flue gas.
Advantage of single field ESP:
- Compact in size and therefore easily accommodate in the available space.
- Create a space for future expansion to adhere future stricter to emission norms(<50 mg/Nm3)
- Economical and easy to install at the existing Boilers, where ESP is now mandatory to install to adhere to current Emission Norms
Electrostatic Tar Precipitator:Electrostatic Tar Precipitator (ETP) is exclusively used for the removal of tar from flue gasses of producer gas plants and coke oven plants.
Value talent cultivation and encourage creative innovation
Effective Team Work
Pursue organizational solidity and press on effective team-work
Ensure first and best of product quality and service
What is Forced Draft Cooler?
The Forced Draft Cooler is tubular convective type Heat Exchanger used for cooling of hot gases.
In Sponge Iron Plants the kiln outlet gases are at approx. 900 to 950 °C. These flue gases cannot be let out to atmosphere as it is and are to be de-dusting. Hence, it is mandatory to provide Dust Collecting system. The major problem of providing the Dust Collecting System is the temperature of the flue gases and it becomes necessary to cool the kiln exhaust gases to around 180 to 220 °C.
The best way to accomplish this task is to have air to gas heat exchanger. Although dilution with ambient air / water spray etc. are available for the heat exchanger. Air to gas force draft heat exchanger are the simple, economical & best suited system.
Forced Draft Cooler - System Description
The air to gas Cooler is a tubular heat exchanger where, the hot kiln exhaust gases are made to pass over the tubes and cold atmospheric Air is made to pass through the tubes.
This system saves considerable energy due to lower pressure drop. Also the cleaning of the FD Cooler is easy as the dusty air is made to pass over the tubes. Since there is practically no moving parts in the system and the design is a modular construction, it is easy to install, and economical and easy to maintain. This system is designed for 24 x 7 operations.
Forced Draft Cooler – Advantages
- No water requirement.
- Less power consumption due to low pressure drop of the system
- Low in operating cost – Due to use of ambient air
- Easier to install, clean and maintenance doe to modular system
- Less space required – due to modular construction
Forced Draft Cooler – Design Basis
- F D Cooler is for the cooling of flue gases.
- Flue gas would pass outside the Tubes and cooling air inside the Tubes
- Easier maintenance of the Heating surface
- Lesser Choking of the Tubes
- Low Pressure drop in the flue gas side thereby saving the power consumption I.D. fan
- Modular construction saves precious time in erection
- On line cleaning of system with compressed air Blast
- Over temperature protection
- Warm cooling air can be used by proper tapping to the advantages of the plant to reduce fuel consumption
- Individual Force Draft Cooler (FDC) for individual kiln