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JP-2026075960-A - Pellet storage method and pellet storage equipment

JP2026075960AJP 2026075960 AJP2026075960 AJP 2026075960AJP-2026075960-A

Abstract

[Problem] To provide a method for storing biomass-derived pellets that can suppress spontaneous combustion when the pellets are stored. [Solution] A method for storing pellets, comprising: a deposit formation step of stacking biomass-derived pellets to form a pellet deposit; and a suppression material placement step of placing a water vapor adsorption suppression material on at least one of the surfaces of the formed pellet deposit and the deposit in the process of stacking the pellets, wherein the water vapor adsorption suppression material is a material that suppresses the adsorption of water vapor generated from the pellet deposit. [Selection Diagram] Figure 5

Inventors

  • 細谷 郁雄

Assignees

  • 出光興産株式会社

Dates

Publication Date
20260511
Application Date
20241023

Claims (13)

  1. A method for storing pellets, A sediment formation process involves stacking biomass-derived pellets to form a pellet deposit, The process includes a step of placing a water vapor adsorption suppressing material on the surface of at least one of the formed pellet deposits and the deposits in the process of stacking the pellets, The water vapor adsorption suppressing material is a material that suppresses the adsorption of water vapor generated from the pellet deposit. How to store pellets.
  2. The aforementioned suppression material placement step is a step of placing a water vapor adsorption suppression material on the surface of the formed pellet deposit, The method for storing pellets according to claim 1.
  3. The aforementioned suppression material placement step is a step of placing a water vapor adsorption suppression material on the surface of the formed pellet deposit and on the surface of the deposit in the process of stacking the pellets. A method for storing pellets according to claim 1 or claim 2.
  4. If the suppression material placement step includes a step of placing a water vapor adsorption suppression material on the surface of the deposits in the process of stacking the pellets, The aforementioned suppression material placement step is performed two or more times during the stacking process. A method for storing pellets according to any one of claims 1 to 3.
  5. The aforementioned suppression material placement step is a step of placing the water vapor adsorption suppression material along the contours of the formed pellet deposit and the deposit in the process of being piled up. A method for storing pellets according to any one of claims 1 to 4.
  6. The water vapor adsorption suppressing material is one or more selected from the group consisting of coated pellets coated with a hydrophobic substance and hydrophobic substances. A method for storing pellets according to any one of claims 1 to 5.
  7. The hydrophobic substance is one or more selected from the group consisting of heavy oil, light oil, petroleum-based residue oil, vegetable oil, waste plastic oil, waste tire oil, and biotar. The method for storing pellets according to claim 6.
  8. The aforementioned hydrophobic substance is a vegetable oil. The method for storing pellets according to claim 7.
  9. The aforementioned pellet piles are at least one of the following: pellet piles piled up in the open, pellet piles piled up in silos and warehouses, and pellet piles piled up in containers. A method for storing pellets according to any one of claims 1 to 8.
  10. The aforementioned pellet is at least one selected from the group consisting of woody biomass pellets, herbaceous biomass pellets, crop residue biomass pellets, and palm oil biomass pellets. A method for storing pellets according to any one of claims 1 to 9.
  11. The aforementioned pellets are wood-based biomass pellets. The method for storing pellets according to claim 10.
  12. A pellet storage facility, A means of stacking biomass-derived pellets in a storage area to form a pellet deposit, The storage area comprises means for placing a water vapor adsorption suppressing material in at least a portion of the storage area, The aforementioned storage location is at least one of the following: open storage, silos, warehouses, and containers. The water vapor adsorption suppressing material is a means for suppressing the adsorption of water vapor generated from the pellet deposit. Pellet storage facility.
  13. The water vapor adsorption suppressing material is one or more selected from the group consisting of coated pellets coated with a hydrophobic substance and hydrophobic substances. A pellet storage apparatus according to claim 12.

Description

This invention relates to a method for storing pellets and a pellet storage facility. In recent years, biomass fuels have been considered as a way to reduce CO2 emissions, which are considered a cause of global warming. Burning biomass releases CO2 , but since plants absorb CO2 as they grow, the use of biomass fuels produced from wood and other materials does not change the amount of CO2 in the atmosphere overall (carbon neutral). Using this biomass fuel as fuel for power plants is expected to significantly reduce CO2 emissions compared to power plants that conventionally use fossil fuels such as coal. While other renewable energy sources such as solar and wind power are also being promoted, biomass fuels, compared to those that depend on natural conditions (sunlight and weather, etc.), can be stored in silos, allowing for flexible power generation to match electricity demand (supply and demand adjustment function). Therefore, it is a superior renewable energy source in that it can be operated in the same way as conventional thermal power plants that use fossil fuels. On the other hand, because biomass has a tendency to generate heat spontaneously, technologies to improve the safety of biomass are being considered. For example, Patent Document 1 discloses a biomass containment device. This biomass containment device comprises a containment container for containing either herbaceous biomass or woody biomass, or both, and means for preventing the formation of a reducing environment that suppresses the growth of microorganisms in the containment container. The means for preventing the formation of a reducing environment is described as a means for blowing gas (e.g., oxidizing gas and inert gas, etc.) above the growth limit temperature of microorganisms attached to the biomass from vertically below the upper surface of the biomass contained in the containment container. Furthermore, Non-Patent Document 1 describes the results of an investigation into the spontaneous combustion mechanism when wood pellets are stored, as well as a method for evaluating their spontaneous combustion properties. Non-Patent Document 2 describes a method for evaluating the spontaneous heating properties when coal is stored. Japanese Patent Publication No. 2014-118187 "Investigation on the Spontaneous Combustion Potential of Wood Pellet Storage," Masayoshi Kimoto, Masami Tozawa, Research Report: M08022, Central Research Report of Electric Power Industry, May 2009."Study on Evaluation Methods for Spontaneous Heat Generation in Coal Storage Management," Masaharu Matsumoto, 55th Japan Coal Science Conference (Kitakyushu City), October 29, 2018. A diagram illustrating the mechanism by which pellets piled up in a pellet deposit spontaneously combust.Schematic diagram of a spontaneous heating test apparatus.A graph showing the results of the spontaneous heating test for samples 1 and 2.Graphs showing the results of spontaneous heating tests in Test Examples 1-4.This figure illustrates a first example of a storage method according to this embodiment.This figure illustrates a second example of the storage method according to this embodiment.This figure illustrates a third example of the storage method according to this embodiment.Scanning electron microscope image of a cross-section perpendicular to the longitudinal direction of the pellet.This graph shows the relationship between the palm oil coating rate and the specific surface area of the pellets when they are coated with palm oil. In this specification, a numerical range represented by "~" means a range that includes the number written before "~" as the lower limit and the number written after "~" as the upper limit. In this specification, mass percentage concentration (unit: mass%) and weight percentage concentration (unit: weight%) are the same value. [First Embodiment] [Storage method for pellets] The pellet storage method according to this embodiment (hereinafter also referred to as "the storage method according to this embodiment") comprises a deposit formation step of stacking biomass-derived pellets to form a pellet deposit, and a suppression material placement step of placing a water vapor adsorption suppression material on at least one of the surfaces of the formed pellet deposit and the deposit in the process of stacking the pellets. The water vapor adsorption suppression material is a material that suppresses the adsorption of water vapor generated from the pellet deposit. In the storage method according to this embodiment, the water vapor adsorption suppressing material is placed on at least one of the formed pellet deposits and the deposits in the process of stacking the pellets. Typically, pellets are aggregates of wood powder, and their internal structure is fine. Furthermore, by partially carbonizing the biomass, fine pores are created in the wood powder itself. Such pellets are thought to have a large surface area, making them more susceptible to water vapor adsorption. F