DOMESTIC SEWAGE TREATMENT SYSTEM
    166.
    发明申请

    公开(公告)号:US20220259087A1

    公开(公告)日:2022-08-18

    申请号:US17627461

    申请日:2020-08-19

    Abstract: A treatment system for domestic wastewater, relating to the technical field of wastewater treatment. The treatment system comprises a primary treatment system, a secondary treatment system, and a sludge treatment system; the secondary treatment system comprises a biochemical tank (21) and a sedimentation tank (22) that are sequentially connected; the biochemical tank (21) is connected to the primary treatment system; the secondary treatment system further comprises a second cylcone separator (23) and a power pump (24); one end of the power pump (24) is connected to a sludge outlet of the sedimentation tank (22) by means of a pipeline, and the other end of the power pump (24) is connected to a second feed pipe (232) of the second cylcone separator (23); a second underflow port (233) is connected to the biochemical tank (21) by means of the pipeline; a second overflow port (234) is connected to the sludge treatment system by means of the pipeline. After active sludge is treated by the second cylcone separator (23), the activity of the active sludge is increased by at least 15%, thereby improving the utilization rate of a resource, reducing the cost of an overall treatment system, also improving degradation efficiency in the biochemical tank, and facilitating popularization.

    Method and apparatus for self-heat-extracting flash evaporation of sulfuric acid alkylation reaction product

    公开(公告)号:US11306259B2

    公开(公告)日:2022-04-19

    申请号:US16665233

    申请日:2019-10-28

    Abstract: The present disclosure relates to a method and an apparatus for self-heat-extracting flash evaporation of a sulfuric acid alkylation reaction product. There is provided a method for self-heat-extracting flash evaporation of a sulfuric acid alkylation reaction product. One step is to coalesce and vaporize a preliminarily distributed sulfuric acid alkylation reaction product to cause preliminary vaporization of a hydrocarbon therein, thereby taking heat away and preliminarily separating the hydrocarbon from sulfuric acid. Another step is to subject the preliminarily separated alkylation reaction to reinforced separation, where the hydrocarbon is further vaporized to take heat away and further separate the hydrocarbon from the sulfuric acid. There is also provided an apparatus for self-heat-extracting flash evaporation of a sulfuric acid alkylation reaction product.

    A Multiaxial Creep-Fatigue Prediction Method Based On ABAQUS

    公开(公告)号:US20220026326A1

    公开(公告)日:2022-01-27

    申请号:US17421929

    申请日:2019-10-31

    Abstract: The present invention discloses a multiaxial creep-fatigue prediction method based on ABAQUS, which comprises: S1: establishing an ABAQUS finite element model, and defining the viscoplastic constitutive equation of the material to be tested by means of the user subroutine UMAT; S2: determining the model parameters required by the viscoplastic constitutive equation; S3: establishing the fatigue damage calculation model and creep damage calculation model of the multiaxial stress-strain state of the material to be tested; S4: establishing an ABAQUS finite element model under the multiaxial stress-strain state, and calculating the stress-strain tensor of each cycle based on the defined viscoplastic constitutive equation and the model parameters; S5: calculating the equivalent stress and equivalent plastic strain by means of the user subroutine USDFLD, and superimposing the fatigue damage and creep damage of each cycle according to the linear cumulative damage criterion to obtain the crack initiation life of the material to be tested based on the fatigue damage calculation model and creep damage calculation model in combination with the stress-strain tensor.

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