Method for Preventing Operational Disrupting Deposits in Pressurized Fluidized Bed Combustion Systems

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This invention describes a process for preventing the build-up of disruptive mineral deposits inside pressurized fluidized bed furnaces, particularly those used for power generation. It involves burning coal (excluding salty coal) mixed with biomass or waste and adding specific types and sizes of calcareous (lime-based) sorbents and foreign bed materials to the furnace. The combination and size distribution of these materials help stabilize the fluidized bed and desulfurize flue gases, thus preventing operational issues caused by mineral residues.

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• Power plant boilers operating with fluidized bed combustion systems
• Industrial facilities using pressurized fluidized bed combustion for energy and waste disposal
• Biomass or waste co-firing applications in power generation
• Systems requiring efficient flue gas desulfurization
• Retrofitting existing coal furnaces to improve operational reliability

BenefitsContent extracted from patent full text and abstract with AI.

• Reduces the risk of disruptive mineral deposits inside furnaces, leading to more reliable operation
• Improves flue gas desulfurization efficiency and regulatory compliance
• Allows for the burning of various types of fuel, including waste and biomass, increasing fuel flexibility
• Enhances the stability of the fluidized bed, which can improve combustion efficiency
• Potentially reduces maintenance frequency and operational downtime of furnaces

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Patent Abstract

Preventing operation disrupting mineral residues in pressurized fluidized bed furnace, preferably pressure supercharged stationary fluidized bed furnace (DSWSF), comprises (a) burning fuels, preferably coal other than salty coal, by adding biomass or waste, and (b) supplying calcareous sorbent for flue gas desulfurization and foreign bed materials for stabilizing the fluidized bed in addition to the fuel to the pressurized fluidized bed furnace, where fine-grained calcareous sorbent, and coarse-grained calcareous sorbent are supplied in dry form. Preventing operation disrupting mineral residues in pressurized fluidized bed furnace, preferably pressure supercharged stationary fluidized bed furnace (DSWSF), comprises (a) burning fuels, preferably coal other than salty coal, by adding biomass or waste, and (b) supplying calcareous sorbent for flue gas desulfurization and foreign bed materials for stabilizing the fluidized bed in addition to the fuel to the pressurized fluidized bed furnace, where (i) fine-grained calcareous sorbent having particle size of less than 200 mu m, preferably less than 100 mu m, is supplied in dry form in a quantity such that fine-grained calcareous sorbent available for desulfurization of flue gases comprises not > 50% stoichiometric lime quantity required for total desulfurization, and (ii) coarse-grained calcareous sorbent having particle size of less than 100 mu m is supplied in dry form in a quantity such that the required total desulfurization is reached with the maximum total desulfurization degree limited by minimum 50 mg/Nm 3>sulfur dioxide of dry flue gas, based on 7 vol.% oxygen.