Dry Electrostatic Precipitator
Although many say that this is a new technology, this equipment was already known in the 1920s. However, cutting-edge technologies have enabled CRANFOS to design and build equipment with levels of efficiency and versatility never seen before.
CRANFOS Electrostatic Precipitators: Efficient, Low-Cost Dust Removal with Advanced Ionization
Although many say that this is a new technology, this equipment was already known in the 1920s. However, cutting-edge technologies have enabled CRANFOS to design and build equipment with levels of efficiency and versatility never seen before.
The operating principle of this equipment is based on the ionization of particles by high voltage and their capture by an electric field, the voltages used for which vary, depending on the process and application, between 20KV and 100KV.
With CRANFOS’ current level of technology, this equipment operates with low energy consumption and low operating and maintenance costs, and in many cases can reinsert the filtered gas into its production process, complying with national and international legislation regarding parameters and values for pollutant gas emissions and energy consumption.
Our equipment has several construction arrangements to adapt to the client’s available physical space. The most commonly used model is the horizontal type, whose particulate collection plates are positioned vertically and parallel to each other. Emission electrodes are responsible for ionizing the gas.
The entire electrostatic precipitator is dimensioned by our technology team with the help of specific software for structural calculation, the result of which is a very resistant and economical equipment body, which varies according to the type of application where factors such as internal pressure, local wind load, among others, are taken into consideration.
Internally, the collector plates are designed to prevent dust from returning to the flow after being electrically retained on the plate. The electrostatic field cleaning systems are never activated simultaneously to prevent re-entry of particulate matter into the gas flow and emission into the stack.
The inlet and outlet funnels are standardized to obtain, with the use of deflector plates and curtains, the best distribution of gases, so that the equipment receives an equal portion of the gas to be treated. The distribution curtains were extensively tested physically and computationally until we defined standards with minimum pressure loss and weights.
Efficient Particle Removal with Automated Cleaning and Custom Transport
Emission electrodes have variables such as resistivity and particulate material load considered in their design so that they can be sized and manufactured for better efficiency and lower weight since they are supported by the roof structure.
The use of hammers specially designed by CRANFOS performs the cleaning function. It is periodic and electronically controlled by a PLC. These hammers collide with shock bars to create the vibration necessary to dislodge the particulate material so that it falls to the bottom of the equipment. Once shaken, the particulate material is detached from the surface of the collector plate and falls to the bottom of the equipment, where it is deposited for later transportation/packaging.
There are a variety of arrangements for the bottom of this equipment, which can range from pyramidal hoppers to flat bottoms, where the material is mechanizedly scraped to a discharge and transport location. This definition is made according to the process to be applied.
The transport of particulate material is also taken into consideration at the time of design so that it can be developed, identifying the best type of output control for this material, whether by a screw conveyor, in the case of longitudinal hoppers, or by rotary valves, pneumatic transport, redler type conveyors, etc.
For more information, please consult our Process Engineering team.
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