Our product profile includes Jet Pumping System for intermittent removal of bottom ash collected at furnace bottom of PF type boilers. System comprises of water impounded refractory lined Bottom Ash Hopper (BAH) of adequate capacity with water seal trough and dip plates, allowing free expansion of the furnace without any air ingress. Continuous water make-up and overflow system keeps the temperature at 60DegC in the BAH. Intermittently, de-ashing is done through operation of the inclined hydro-pneumatically operated feed gates, clinker crushers and jet pumps. High pressure water supplied to the jet pumps acts as motive water to pump the bottom ash slurry to dewatering bins/slurry sump.
For projects demanding continuous removal of bottom ash collected at furnace bottom, we offer Submerged Scraper Chain Conveyor (SSCC) System. The system comprises of dry type refractory lined Bottom Ash Hopper (BAH) of adequate capacity with water seal trough and dip plates, allowing free expansion of the furnace without any air ingress.
BAH protects the conveyor from the direct impact of hot ash and hot ash is smoothly discharged to the water bath of the SSCC through horizontal hydro-pneumatically operated discharge gates provided below the BAH. The discharge chute at the hopper outlet remains dipped into the water slag bath of SSCC ensuring sealing of furnace bottom. Storage capacity of BAH permits sufficient maintenance time for the SSCC as well as reduces the extraction load on the SSCC. Within SSCC, a temperature of 60DegC is always maintained. Bottom ash is extracted from the trough continuously using high quality chains, sprockets and bars. After the dewatering at the sloping portion, moist ash is discharged to a clinker crusher for onward disposal either through hydraulic sluice way to slurry pond or belt conveyors to bottom ash storage silo for onward disposal. For higher capacity SSCC, Hydraulic drive units, hydraulic chain tensioning units and motorized traverse drives for taking it to maintenance are provided. Our SSCC systems are designed for plant capacity upto 1000 MW.
In certain applications, which call for bottom ash, available in slurry form to be disposed-off through trucks or through high concentration slurry disposal system along with fly ash, our De-watering Bin System takes precedence. De-watering bins with the decanting system removes water from the bottom ash and this water can be recycled through a set of settling tanks, surge tanks, transfer pumps, etc. The bottom ash collected in the bin can be either periodically removed through trucks or can be fed to high concentration slurry disposal system for disposal in paste form along with fly ash.
Dry Bottom Ash Handling (DRYCON) System is a world-class product added to our product portfolio in view of the environmental concerns of conserving water.. Regardless of the quality, quantity and utility of bottom ash, it is absolutely advantageous to adopt a DRYCON system for Bottom Ash extraction.
The DRYCON system is mounted fully sealed to the combustion chamber. The negative pressure inside the boiler sucks air in a controlled manner mainly at the top end of the DRYCON system into the DRYCON system. This air travels in counter flow direction along the surface of the ash, which rests on the conveyor belt. This activates a re-burning process of the glowing ash, which reduces the unburned carbon level and frees up additional thermal energy. The air is heated up before it enters the combustion chamber and adds additional thermal energy to the steam generating process inside the boiler.
Certain applications which specially require Mechanical System, like in case of CFBC type boilers for transportation of bed ash collected at furnace bed, we offer drag chain conveyor system, followed by pressure pneumatic conveying system as per the Client's specific requirement.
We offer Dense Phase Pneumatic Conveying System for handling of bed ash/coarse ash/fly ash collected at furnace bed/economiser/air pre-heater/electrostatic precipitator hoppers of AFBC/CFBC/WHRB/etc. type boilers firing various fuels like coal/lignite/bagasse/rice husk/etc.
MBPL, with its patented Dome Valve design and the technology of Dense Phase Pneumatic Conveying, has always kept a brand name for these applications by giving practical solutions to various requirements as arise from time to time, irrespective of batch type/continuous conveying, shorter/longer distances, lower/higher capacities, temperature ranges, etc. MBPL's Pressure Pneumatic Conveying Systems installation capacity range require no mention.