Modified coal storage method

{
  "publication_number": "US10287524B2",
  "country": "US",
  "kind": "B2",
  "title": "Modified coal storage method",
  "abstract": "A method for storing a modified coal includes a pile forming step of forming a pile by stacking a blended coal of an agglomerate-shaped coal and a powdery modified coal. The modified coal has a content of particles having a particle diameter of 2 mm or less of 35% by mass or more. The pile formed in the pile forming step has a packing density of 1.0 g/cm 3 or more.",
  "claims": [
    "1. A method, comprising: agglomerating a modified porous coal, to generate an agglomerated-shaped coal; aging the agglomerated-shaped coal, to generate an aged agglomerated-shaped coal; blending the aged agglomerated-shaped coal with a powdery modified coal, to generate a blended coal; and forming a pile by stacking the blended coal, wherein: the powdery modified coal is generated in the agglomerating step or the aging step; the aged agglomerated-shaped coal and the powdery modified coal are both brown coal or both sub-bituminous coal; the blended coal comprises 35% by mass or more of particles having a particle diameter of 2 mm or less; and the pile has a packing density of 1.0 g/cm 3 or more.",
    "2. The method according to claim 1, wherein the pile has an airflow resistance coefficient of 1×10 7 Pa·s/m 2 or more.",
    "3. The method according to claim 1, wherein the powdery modified coal is generated in the aging step.",
    "4. The method according to claim 3, wherein the pile has an airflow resistance coefficient of 1×10 7 Pa·s/m 2 or more.",
    "5. The method according to claim 1, wherein the powdery modified coal is generated in the agglomerating step.",
    "6. The method according to claim 5, wherein the pile has an airflow resistance coefficient of 1×10 7 Pa·s/m 2 or more.",
    "7. The method according to claim 1, wherein the pile has an airflow resistance coefficient from 1×10 7 Pa·s/m 2 to 2×10 9 Pa·s/m 2.",
    "8. The method according to claim 1, wherein the pile has an airflow resistance coefficient from 3×10 7 Pa·s/m 2 to 7×10 8 Pa·s/m 2."
  ],
  "description_excerpt": "The present invention relates to a method for storing modified coal.\n\nCoal used in a thermal electric power plant, an iron work or the like is usually stored as a pile stacked in an outdoor yard. The coal thus stored produces heat by a reaction with oxygen in the air to sometimes cause spontaneous ignition. In particular, a low-rank coal has high oxidation reactivity because of its porous form and easily produces heat. Therefore, a method of preventing spontaneous ignition by water spraying or the like onto a pile has been generally used. However, since this method requires periodic water spraying, an efficient spontaneous ignition prevention method has been desired.\n\nIn such circumstances, as techniques for preventing spontaneous ignition of a coal pile, there have been proposed a method of covering a pile surface with a resin or the like (see JP-A-5-230480 and JP-A-2000-297288) and a method of spraying a surfactant containing a radical trapping agent or an oxygen trapping compound (see JP-A-2001-164254). However, since the above-mentioned respective methods require the resin, the radical trapping agent or the like, there is a concern about a rise in cost.\n\nOn the other hand, a production method for obtaining a modified coal from a low-rank coal (porous coal) having a high water content rate and a low calorific value has been developed (see JP-A-7-233383). In this production method, the porous coal is first ground into a granular form, and thereafter, mixed with a mixed oil containing a heavy oil component and a solvent oil component to obtain a raw material slurry.",
  "cpc": [
    "C10L 5/366",
    "B65G 3/02",
    "C10L 2250/06",
    "C10L 2290/06",
    "C10L 2290/08",
    "C10L 2290/22",
    "C10L 2290/54",
    "C10L 2290/547",
    "C10L 5/36",
    "C10L 5/361",
    "C10L 5/363",
    "C10L 9/00"
  ],
  "ipc": [
    "B65G 3/02",
    "C10L 5/36",
    "C10L 9/00"
  ],
  "assignees": [
    "Kobe Steel Ltd"
  ],
  "inventors": [
    "Toru Higuchi",
    "Takuo Shigehisa",
    "Yoichi Takahashi",
    "Atsushi Furuya"
  ],
  "filing_date": "2015-05-20",
  "publication_date": "2019-05-14",
  "grant_date": "2019-05-14",
  "priority_date": "2014-05-23",
  "application_number": "US-201515305543-A",
  "family_id": "54554097",
  "cited_by_count": 0,
  "citations": [
    "JPS4820201B1",
    "US4941888A",
    "JPH05230480A",
    "JPH07233383A",
    "US5556436A",
    "US5919277A",
    "WO1999032586A1",
    "JP2000297288A",
    "JP2001164254A",
    "US20030069149A1",
    "JP2001303066A",
    "JP2006077155A",
    "WO2014083918A1",
    "US20150240178A1"
  ]
}