Feed line design

{
  "publication_number": "US4830545A",
  "country": "US",
  "kind": "A",
  "title": "Feed line design",
  "abstract": "The present invention is directed to an apparatus and method for minimizing mass flow rate fluctuations of a particulate solid fuel and gas mixture having a coal mixture mass flow rate of about 50-800 kg/cubic meter and a corresponding frequency range of about 0.1 to 100 Hertz to a reactor.",
  "claims": [
    "1. An apparatus for minimizing mass flow rate fluctuations in the frequency range of about 0.1 to 100 Hertz of a particulate solids and gas mixture transported to at least one means for injecting said mixture into a reactor, said apparatus compising: means for receiving said mixture; means for discharging said mixture; means for maintaining a level of solids in said means for receiving said mixture of at least about 50 percent of the maximum volume above said means for discharging said mixture; means for controlling the discharge flow rate of said mixture exiting said means for discharging said mixture; means for maintaining a differential pressure of at least about 2 bar between said means for receiving said mixture and said reactor; conduit means for pneumatically transporting said mixture from said means for discharging said mixture to said reactor, said conduit means having a diameter in the range of about 4-150 mm and the suspension density of said mixture being in the range of 50-800 kilograms per cubic meter; and means for selectively controlling the mass flow rate of said mixture being transported from said means for receiving said mixture to said reactor.",
    "2. The apparatus of claim 1 wherein said means for controlling the mass flow rate of said mixture includes means for determining the mass flow rate of said mixture; means for comparing the determined mass flow rate with a preselected mass flow rate of said mixture; and means for adjusting the mass flow rate of said mixture.",
    "3. The apparatus of claim 1 including means for selectively controlling the ratio of oxygen to said mixture introduced to said reactor.",
    "4. The apparatus of claim 3 wherein said means for selectively controlling the ratio of oxygen to mixture includes means for determining the mass flow rate of said mixture; means for comparing the determined mass flow rate with a preselected mass flow rate of the mixture, and means for adjusting the flow rate of oxygen introduced into said reactor.",
    "5. The apparatus of claim 1 wherein means for maintaining differential pressure includes means for determining pressure within said means for receiving said mixture; means for determining pressure of said reactor; means for comparing the determined pressures; and means for adjusting the pressure of said means for receiving said mixture.",
    "6. A method for minimizing mass flow rate fluctuations in the frequency range of about 0.1 to 100 Hertz of a particulate solids and gas mixture transported to at least one means for injecting said mixture into a reactor, said method comprising the steps of: introducing said mixture into a means for receiving said mixture; discharging said mixture from a means for discharging said mixture; maintaining a level of solids in said means for receiving said mixture of at least about 50 percent of the maximum volume above said means for discharging said mixture; controlling the discharge flow rate of said mixture exiting said means for discharging said mixture; maintaining a differential pressure of at least about 2 bar between said means for receiving said mixture and said reactor; pneumatically transporting said mixture by conduit from said means for discharging said mixture to said reactor, said conduit means having a diameter in the range of about 4-150 mm and the suspension density of said mixture being in the range of 50-800 kilograms per cubic meter; and selectively controlling the mass flow rate of said mixture being transported from said means for receiving said mixture to said reactor.",
    "7. The method of claim 6 wherein controlling the mass flow rate of said mixture includes determining the mass flow rate of said mixture; comparing the determined mass flow rate with a preselected mass flow rate of said mixture; and adjusting the mass flow rate of said mixture.",
    "8. The method of claim 6 including selectively controlling the weight ratio of oxygen to said mixture introduced to said reactor.",
    "9. The method of claim 8 wherein selectively controlling the ratio of oxygen to mixture includes determining the mass flow rate of said mixture; comparing the determined mass flow rate with a preselected mass flow rate of said mixture, and adjusting the flow rate of oxygen introduced into said reactor.",
    "10. The method of claim 6 wherein maintaining differential pressure includes determining the pressure within said means for receiving said mixture; determining the pressure within said reactor; comparing the determined pressures; and adjusting the pressure within said means for receiving said mixture."
  ],
  "cpc": [
    "B65D 88/28",
    "B01J 3/02",
    "B01J 8/003",
    "C10J 2300/1223",
    "C10J 3/50",
    "Y10S 48/04"
  ],
  "assignees": [
    "SHELL OIL CO"
  ],
  "filing_date": "1987-09-18",
  "publication_date": "1989-05-16",
  "grant_date": "1989-05-16",
  "priority_date": "1987-09-18",
  "application_number": "US-9858887-A",
  "family_id": "22270004",
  "citations": [
    "JPS597622A",
    "US3604758A",
    "US4017269A",
    "US4049394A",
    "US4482275A",
    "US4484852A",
    "US4570552A"
  ]
}