Ash handling terminology

  • Slag: Characteristic ash removed from furnace walls
  • Bottom ash: Ash removed from the bottom of the furnace
  • Clinker: Large piece of bottom ash that must be broken up before transport
  • Fly ash: Ash carried by the flue gas into the backpass region and beyond
  • Popcorn ash: Characteristic ash collected in economizer and air heater hoppers
  • Dust: Fine ash particulate
  • Hydro ejector: Venturi device that pulls bottom ash into hydraulic transport system
  • Water bin: Dewatering bin for removing water from bottom ash
  • Hydrovactor: Venturi device that provides vacuum source for pneumatic transport
  • Airlock value: Two chamber device for feeding ash into higher pressure transport line
  • Materials handling valve: Valve that admits flyash and air flow into vacuum transport line
  • Collector: Ash/air separator and transfer tank from vacuum system to silo
  • Transporter: Fly ash collection and aeration vessel for dense phase pneumatic transport
  • Vacuum/pressure transfer station: Collection and transfer vessel from vacuum line to pressurized line in combination vacuum/pressure pneumatic system
  • Drag chain: Primary mover in mechanical drag conveyor system
  • Flights: Attached to drag chain to push ash along stationary platform
  • Unloader: Device to unload dry ash storage silo into transport vehicles
  • Conditioner: Adds water to flyash during unloading to minimize airborne dust
  • Pugmill: One version of combined silo unloader/conditioner

Source: B&W

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Bio-waste boilers market changes for 2020

Bio-waste boilers market changes for 2020: decentralized solutions, local fuel sources and circular economy

  • Demand for increased fuel flexibility to lower purchasing costs
  • Trend of utilization of local renewable biomass and recycled fuels
  • Plant size trend (power units) from hundreds MWel class to 10-50 MWel class
  • Integration with decentralized energy production
  • Continuously growing requests for multi-fuel boiler design
  • Increasing penetration of WtE solutions and concepts

According to SHI FW, November 2019

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Converting biomass to energy: a guide for developers and investors (2017)

Biomass resources are found almost everywhere and can become a reliable and renewable local energy source to replace fossil fuels. Energy produced from biomass can reduce reliance on an overloaded electricity grid and can replace expensive fuels used in local industries. The International Finance Corporation (IFC) presents this guide as a practical tool to help developers of and investors in biomass projects assess the technical and financial feasibility of the different biomass-to-energy options available to their businesses and industries. This guide describes all the necessary steps in the development of a biomass-to-energy project. Following this introductory chapter, the authors present an overview of the entire project development process, so that project developers have an idea of the overall process they are about to enter. Next, the guide describes biomass resources and how to secure biomass supply. This is followed by several in-depth chapters covering the technology aspects, plant design, plant procurement, construction, and operation. After the more technical aspects, the guide focus on framework conditions, investment costs, financial and economic analysis, and securing financing. Finally, the guide presents potential environmental and social considerations and concludes with a chapter on the lessons learned from implemented biomass-to-energy projects.  

Download the full report (216 pages)

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