PRODU

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PRODUÇÃO E UTILIZAÇÃO DE GÁS NATURAL TRÊS
PESQUISAS EM DESENVOLVIMENTO NA POLI - USP

• Silvio de Oliveira Júnior
• Departamento de Engenharia Mecânica
• ESCOLA POLITÉCNICA DA USP
• silvio.oliveira_at_poli.usp.br

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Heat Transfer In A Twin-screw Multiphase Pump
Thermal Modeling And One Application In The
Petroleum Industry
Celso Yukio Nakashima Silvio de Oliveira
Jr. Polytechnic School - University of São
Paulo Elisio F. Caetano Petrobras/Cenpes
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Objectives

• Modeling of heat transfer through screws and
  casing
• Analyze thermal behavior during LOP events
• Find temperature distributions in screws and
  casing
• Seek for critical temperature values during LOP

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SMPS-500
Flow 500 m3/h Dp60 bar Speed 0 3000 rpm GVF
0-95
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Twin-Screw Pumps
flank clearance
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Thermal Modeling

• Energy streams

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Thermal Modeling

• Energy and mass balances
• During LOP
• Heat Transfer

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Thermal Modeling

• Heat transfer through casing

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Thermal Modeling

• Heat transfer through rotors

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Thermal Modeling

• Heat transfer coefficients

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Thermal Behavior During LOP

• Sample data during LOP

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Thermal Behavior During LOP

• Results

(a) Screw temperature before LOP
(b) Screw temperature after LOP
(c) Casing temperature after LOP
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Conclusions

• Temperature rise was not critical
• Prime recovery reduces temperatures
• Next steps
• Calculation of heat transfer coefficients
• Coupling of heat transfer model with the
  thermo-hydraulic model of a twin-screw multiphase
  pump

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PERFORMANCE OPTIMIZATION OF NATURAL GAS AND
SUGARCANE BAGASSE BASED COGENERATION SYSTEM
Leonardo Moneci Zamboni Silvio de Oliveira Jr.
and Arlindo Tribess Mechanical Engineering
Department Polytechnic School of the University
of São Paulo - BRAZIL
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Objective

• This paper presents the exergy and
  thermoeconomic performance evaluation of
  cogeneration systems designed for a sugar and
  alcohol mill that uses natural gas and sugarcane
  bagasse as fuels.

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Cogeneration systems

• The combined use of natural gas and sugarcane
  bagasse in cogeneration plants can generate
  electricity and steam for processes as well as to
  allow the commercialization of surpluses.

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Cogeneration Systems

• System A

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Cogeneration Systems

• System B

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Cogeneration Systems

• System C

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Cogeneration Systems

• System D

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Cogeneration Systems

• System E

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Cogeneration Systems

• System F

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Cogeneration Systems

• System G

During 6 months
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Results
G
B
E
C
F
A
D
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Sistema Tetra-Combinado de trigeração, para
produção de eletricidade, água gelada e vapor de
processo
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Parâmetros de desempenho do sistema
Tetra-Combinado de Trigeração
Ept (kW) Qev (kW) Qp (kW) ? ?b (?) ?e (?)
15853 3872 4941 0,556 45,00 68,00
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Custos de produção das utilidades geradas
ce (US/MWh) cv (US/t) cag (US/t)
36,37 19,23 0,13