Simplified submerged chain conveyor for bottom ash conversions

A submerged grind conveyor system for removing bottom ash from a large-scale coal fired combustion device having a bottom hopper for collecting the bottom ash with a bottom gate for controlling the flow of the ash from the hopper and a grinder to reduce the size of large ash particles, comprising;

• a submerged chain conveyor unit having a chain conveyor housing that is separate from the bottom hopper, an elongated closed duct with a receiving section positioned for receiving ash from the bottom gate and an inclined section for elevating the ash, and having an internal continuous drag chain conveying unit for transporting the ash from the hopper to the inclined section where the accumulated ash is dewatered for discharge from the system, wherein the feed of the ash into the chain conveyor unit is controlled by a conveyor drive unit through a signal relating to a drive torque output.

A submerged grind conveyor system for removing bottom ash from a large-scale coal fired combustion device having a bottom hopper for collecting the bottom ash with a bottom gate for controlling the flow of the ash from the hopper and a grinder to reduce the size of large ash particles, comprising;

• a submerged chain conveyor unit having a chain conveyor housing that is separate from the bottom hopper, an elongated closed duct with a receiving section positioned for receiving ash from the bottom gate and an inclined section for elevating the ash, and having an internal continuous drag chain conveying unit for transporting the ash from the hopper to the inclined section where the accumulated ash is dewatered for discharge from the system in which the conveyor units loaded from multiple points from the same hopper and in which the feed of the ash into the chain conveyor unit is controlled by a conveyor drive unit through a signal relating to a drive torque output of the drive unit.

A submerged grind conveyor system for removing bottom ash from a large-scale coal fired combustion device having a bottom hopper for collecting the bottom ash with a bottom gate for controlling the flow of the ash from the hopper and a grinder to reduce the size of large ash particles, comprising;

• a submerged chain conveyor unit having a Chain conveyor housing that is separate from the bottom hopper, an elongated closed duct with a receiving section positioned for receiving ash from the bottom gate and an inclined section for elevating the ash, and having an internal continuous drag chain conveying unit for transporting the ash from the hopper to the inclined section where the accumulated ash is dewatered for discharge from the system,
• the system configured for operation with maintaining a water column in the submerged chain conveyor unit at a second water level less than a first water level within the hopper, the system configured to operate in a batch process in which the bottom gate of the hopper is periodically opened to discharge accumulated water and ash from the hopper into the submerged chain conveyor unit with the bottom gate periodically closed to isolate the hopper from the submerged chain conveyor unit while the hopper collects the bottom ash over time.

A submerged grind conveyor system for removing bottom ash from a large-scale coal fired combustion device having a bottom hopper for collecting the bottom ash with a bottom gate for controlling the flow of the ash from the hopper and a grinder to reduce the size of large ash particles, comprising;

• a submerged chain conveyor unit having a chain conveyor housing that is separate from the bottom hopper, an elongated closed duct with a receiving section positioned for receiving ash from the bottom gate and an inclined section for elevating the ash, and having an internal continuous drag chain conveying unit for transporting the ash from the hopper to the inclined section where the accumulated ash is dewatered for discharge from the system
• the system configured for operation with the hopper in the form of a dry hopper with a water column maintained within the submerged chain conveyor unit with the system operating continuously or in batch mode to receive the bottom ash which falls into the submerged chain conveyor unit.

A submerged grind conveyor System for removing bottom ash from a large-scale coal fired combustion device having a bottom hopper for collecting the bottom ash with a bottom gate for controlling the flow of the ash from the hopper and a grinder to reduce the size of large ash particles, comprising:

• a submerged chain conveyor unit having a chain conveyor housing that is separate from the bottom hopper, an elongated closed duct with a receiving section positioned for receiving the ash from the bottom gate and an inclined section for elevating the ash, and having an internal continuous drag chain conveying unit for transporting the ash from the hopper to the inclined section where the accumulated ash is dewatered for discharge from the system,
• the system configured for operation with maintaining a water column in the closed duct having a water column height within the hopper and in the conveyor unit at a generally equal level wherein water fills a portion of the inclined section and an extending dry portion of the inclined section providing dewatering of the ash transported by the drag chain conveying unit, the conveyor system configured for continuous or batch operation and collection of the ash from the hopper, the hopper and the submerged chain conveyor housing hydraulically connected.

A submerged grind conveyor system for removing bottom ash from a large-scale coal fired combustion device having a bottom hopper for collecting the bottom ash with a bottom gate for controlling the flow of the ash from the hopper and a grinder to reduce the size of large ash particles, comprising;

• a submerged chain conveyor unit having a chain conveyor housing that is separate from the bottom hopper, an elongated closed duct with a receiving section positioned for receiving ash from the bottom gate and an inclined section for elevating the ash, and having an internal continuous drag chain conveying unit for transporting the ash from the hopper to the inclined section where the accumulated ash is dewatered for discharge from the system,
• the submerged chair conveyor unit in the form of a first submerged chain conveyor unit receiving the ash from the bottom gate and a second submerged chain conveyor unit receiving the ash from the first submerged conveyor unit and including the inclined section, each of the first and the second submerged chain conveyor units having respective first and second drag chain conveying units.