Pulverized coal-fired boilers
This is an example of application to exhaust gas processing from a pulverized coal-fired boiler. We reduced the size of the fabric filter by increasing the filter bag length to 9 m (normal length is 6.0 m or 6.9 m). Using a long filter bag for a large quantity of process gas made it possible to reduce the size of the device.
In addition, we realized in reducing the electrical power consumption of the exhaust fan by using our original venturi to reduce the pressure drop during operation.
(1) Converter building air
This is an example of a fabric filter for environmental dust collection for converter buildings in a steel plant. Reverse pressure cleaning is used to remove the collected dust. A damper is installed in the reverse gas line to create pulsation, which improves the removal performance (pulsative reverse pressure cleaning method). The interior of the fabric filter is divided into several compartments, so the gas flow can be stopped in one compartment to replace the filter bag, even during operation. This is suitable for cases with large quantities of process gas.
(2) Coke oven gas
This is an example where the gas from a coke oven is suctioned, and fine-particle dust is collected. Adding a coarse particle auxiliary agent reduces the pressure drop in the fabric filter for energy-efficient operation.
(3) Cutting machines
This is an example where dust was collected from the exhaust gas coming out of a cutting machine that cuts stainless-steel slabs. Charging and agglomerating fine stainless-steel particles generated by gas cutting using the electrostatic pre-charger makes it possible to improve the collection efficiency for sub-micron particles. Also, there is less of a pressure drop in the fabric filter pressure, which reduces energy consumption.
This format, where an electrostatic charger is placed in the stage before the fabric filter, is called an electrostatically aided fabric filter.
Cement calcination equipment
This is an example of application to exhaust gas processing for a cement calcination furnace and suspension preheater. The exhaust gas from the cement calcination furnace is passed to a fabric filter, after coarse particles are removed using a cyclone preduster. This gas contains a high concentration of fine-particle cement dust, which is collected by the fabric filter.
The fabric filter is divided into several compartments, pulse jets remove the collected dust, which gradually decreases the flow of gas in the compartments. Using pulse jets to remove dust by shutting off the gas flow (offline method) makes it possible to maintain stable operation with low pressure loss. The collected cement dust is reused as raw material for cement.
This is an example of processing the exhaust gas from a waste incinerator using a filter cloth with a dioxin decomposition catalyst (filter cloth-supporting catalyst). Minute quantities of gaseous dioxins contained in the exhaust gas from waste incinerators, etc., are decomposed and removed, and dust is efficiently collected.