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Demountable multi-riser elevated flare


As the oil refining and chemical plants get larger in scale, demountable common derrick multi-riser flare system has become one of the tendencies where the elevated flare system develops as it supports several flare risers on one common derrick support and allows each flare riser to be inspected and maintained separately.

After years of development, Qiyao Energy has completed the popularization of demountable common derrick multi-riser technology in China.

1.          Qiyao Energy is the first Chinese supplier with capability and experience in providing EPC service of such flare type;

2.          Qiyao Energy is the first Chinese supplier that has performed the dismantling, reassembly and maintenance process of a demountable flare system;

3.          Till 2015, Qiyao Energy has built 20 sets of demountable elevated flare systems.

Shanghai Qiyao Energy has performed the dismantling and reassembly of flare risers via the guide rail system on the derrick support for Sinopec Hainan Company, PetroChina Dushanzi Company, Sinopec Changling Company, Sinopec Maoming Company and CNOOC Huizhou Oil Refinery, which represents the successful application of the demountable system independently developed by Qiyao Energy.



 

  • Compared with conventional elevated flare system, the demountable system has following features:

      One derrick supports several flare risers at the same time;

      The inspection and maintenance of one flare riser will not affect normal operation of other flare risers.

      All inspection and maintenance work can be completed below certain height.

      The dismantling and installation of flare tip and flare riser requires no large crane.

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     1.Typical case: 8MT/y oil quality improvement project of SinoPec Shijiazhuang Company

    This flare system is an ancillary facility of 8,000,000t/y oil quality improvement project of Sinopec Shijiazhuang Refining & Chemical Company. It consists of six sets of flare systems and is capable of handling the flammable gas vented during normal production, startup& shutdown and emergency venting of up to 3 enterprises. It is the first demountable elevated flare with six flare risers on one common derrick support in Asia, and it’s also the first demountable flare system that the flare risers can be dismantled and re-installed at both sides of the derrick support in the world.

    The 140m high demountable flare system has six flare risers located at two opposite sides, namely A side and B side of the derrick support.

    Name

    Specification

    Design capacity

    Remarks

    High pressure flare

    DN1200

    638t/h

    A side flare

    Low pressure flare

    DN1000

    258t/h

    A side flare

    Sour gas flare

    DN300

    5000 Nm3/h

    A side flare

    Goldstone low pressure flare

    DN1000

    139457Nm3/h

    B side flare

    CYC heavy hydrocarbon flare

    DN800

    180t/h

    B side flare

    Goldstone sour gas flare

    DN300

    5143Nm3/h

    B side flare


     

    2.Typical case: 8MT/y oil quality improvement project of SinoPec Shijiazhuang Company


    The demountable flare system with multiple risers on one common derrick for 8,000,000t/y oil refinery project of Hainan Shihua is the first demountable common derrick multi-riser elevated flare system designed, fabricated and constructed completely in China. Moreover, the demountable flare system was successfully dismantled and reassembled at the overhaul interval.

    The flare system built for HaiNan Shihua was put into use in May, 2006. In December, 2009, during the overhaul of all equipment in HaiNanShihua, LP flare was smoothly dismantled for inspection while the HP flare and sour gas flare were still in operation.

    The height of demountable flare system is 130m, which is composed of three sets of flares arranged at the vertical side of the derrick.

    Name

    Specification

    Design Capacity

    Remarks

    High pressure flare

    DN1200

    508t/h

     

    Low pressure flare

    DN1200

    208t/h

     

    Sour gas flare

    DN350

    9.75t/h

     


     

    3.Typical case: 10MT/y oil refining and 12MT/y ethylene technical reconstruction project of CNPC Dushanzi Company


    The demountable flare system is the ancillary facility for the 10,000,000t/y oil refining and 120,000t/y ethylene technical reconstruction project of PetroChina Dushanzi company.

    The 150m high demountable flare system consists of three sets of flare located at the vertical side of the derrick.

    Name

    Specification

    Design Capacity

    Remarks

    High pressure flare

    DN1200

    500t/h

    Backup with low pressure flare

    Low pressure flare

    DN1200

    315.58t/h

    Backup with high pressure flare

    Sour gas flare

    DN450

    3.44t/h


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