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Layout Design and
Numerical Simulation Analysis of Half-open Pipes at Inlet of Separators
Fan Xuejun
2024, 41 (3):
1-4.
Half-open pipe is commonly used at
the inlet of separators, and its structure and layout have a vital impact on the
separation effect. In order to study the influence of half-open pipe layout on
gas-liquid separation, this paper takes the separator of a domestic offshore
platform as the research object, and uses numerical simulation software to
simulate and analyze the half-open pipe models at different installation
positions. The influence of different installation positions of half-open pipes
on gas-liquid pre-separation effect is obtained, and some suggestions are put
forward for the layout design of half-open pipes at the inlet of separators, providing
theoretical support for the optimal design of separators.
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Comparative Analysis of
Stiffness Calculation of Concrete-filled Rectangular Steel Tube Columns in
Petrochemical Plants
Liu Peng
2024, 41 (3):
5-10.
Using
Midas modeling, the lateral displacement of industrial columns with three
different cross-section types, i.e., concrete-filled rectangular steel tube,
concrete and H-shaped steel, was compared and calculated. The results show that
concrete-filled steel tube column has significant advantages in increasing
stiffness. Concrete-filled steel tube is a kind of composite material, and calculation
formulas for equivalent stiffness from domestic and international
specifications were listed based on the current theory of the superposition and
reduction of composite material stiffness. Relevant domestic and international specifications consider the linear
superposition and reduction of concrete and steel tubes in the calculation of
the section stiffness of concrete-filled steel tube composite structures, and
the reduction of concrete's stiffness takes into account the concrete cracking.
In order to study the mutual constraints between concrete and steel tubes in
practical applications, finite element analysis was carried out using Abaqus to
model the interaction between steel and concrete in concrete-filled steel tube
columns, and the stress-strain states of concrete-filled steel tube columns
under different conditions such as compression and bending were compared. The
analysis identified the parts of the structure that are prone to failure,
providing a basis for calculation and design.
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Comparison and Discussion on
Pad Flange Calculation in HG/T 20582
Yuan Xuyang
2024, 41 (3):
11-15.
As a common
flange connection structure for pressure vessels, pad flange is mostly used for the top head
connection of agitators. In this paper, pad flange calculation in different
versions of HG/T20582 is compared and analyzed, and on this basis, the
calculation of pad flange is verified by finite element analysis, which
provides reference for the design and calculation of pad flange in the future.
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Influences of Hydrogen Fuel
and Conventional Fuel on Heating Furnaces
Jia Yuchuan
2024, 41 (3):
16-20.
To
explore the feasibility of using hydrogen as the fuel for heating furnaces,
this article takes a heating furnace in a domestic refinery as an example,
studies the heat transfer efficiency of hydrogen fuel through theoretical
calculations and FRNC5 engineering software, and compares and analyzes the
parameters of hydrogen fuel heating furnaces with those of conventional fuel
heating furnaces. Finally, research conclusions are drawn on the heat transfer
efficiency, fuel consumption, carbon reduction and oxygen rich combustion of
hydrogen fuel, providing reference for subsequent engineering practices.
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Cause Analysis and
Countermeasures for Vibration of Low Speed Rotors in Centrifugal Air Compressors
Guang Keping
2024, 41 (3):
21-24.
Rotor vibration is
one of the important factors that restrict the safe and reliable operation of centrifugal air
compressors. In this paper, the causes of the high vibration of low speed rotors
in centrifugal air compressors are analyzed and some countermeasures for the high
vibration of low speed rotors are put forward. By taking maintenance measures
such as replacing the inlet filter chamber and cleaning the primary and
secondary impeller and the spiral case in centrifugal air compressors, the
vibration of low speed rotors in centrifugal air compressors has been reduced,
and good results have been achieved after the maintenance.
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Cause Analysis and
Treatment of Abnormal Vibration on Driving Side of High-Pressure Liquid Ammonia
Pump
Shi Kuankuan
2024, 41 (3):
25-28.
By analyzing the reasons for power frequency failure on
the driving side of high-pressure liquid ammonia pump, this paper concludes
that the high-pressure liquid ammonia pump has the problem of rotor dynamic
unbalance. By improving the dynamic balance driving method for the rotor and rationally selecting
dynamic balance check speed, the dynamic unbalance is successfully reduced to below
the maximum dynamic unbalance allowed by design, thus solving the abnormal
vibration problem on the driving side of the high-pressure
liquid ammonia pump.
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Stress Analysis of Connection
Structure between Non Folded Slant Conical Shell and Cylinder under Internal
Pressure
Yang Xiaonan
2024, 41 (3):
29-32.
The finite element method was used to analyze the stress distribution of
the connection structure between non folded slant conical shell and cylinder
under internal pressure. The results showed that under internal pressure, there
were significant local stresses at both the large and small ends of the slant
conical shell. The maximum stress intensity at the large end occurred at the
position with the largest cone angle at the connection between the slant
conical shell and the large end,
while the maximum stress intensity at the small end occurred at the position with
a small cone angle near the lower part of the connection between the slant conical
shell and the small end. Bending stress is the main stress at both the large
and small ends of slant conical shells, but the bending stress at the small end of slant conical
shell is higher than that at the large end. In addition, to facilitate the comparison
of stress distribution at the connection between slant conical shells of
different sizes and the cylinder, this paper introduces a stress amplification
coefficient and studies the variation law of stress at this point through the
variation of this coefficient.
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Analysis on Safety Margin of
Flange Stud Preload
Xu Lei, Guo Xuehua
2024, 41 (3):
33-36.
In
this paper, the factors influencing the tightening of studs are analyzed from
the aspects of design required preload, actual required preload, actual tightening
force and upper limit of design preload. In addition, some suggestions are put
forward from the upper limit of design preload, i.e., the strain strengthening
treatment of austenitic stainless steel stud is an effective measure to improve
the stud strength. A simplified algorithm is provided for setting the initial
load of studs.
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Numerical Simulation of
Residual Stress in Deep Drawn Liquid Nitrogen Biological Containers
Gu Ying, Feng Chenran, Guo Yanni, Ren Jinping, Kang Jinke
2024, 41 (3):
37-40.
Deep
drawing has been widely used in the manufacture of pressure vessels for its
advantages of simple manufacturing process and high manufacturing efficiency,
but the stainless steel cylinder formed by this method is easy to produce
residual stress, which affects the quality of liquid nitrogen biological containers. In this paper, in order to study the influence of three main deep
drawing process parameters such as blank holder force, friction coefficient and
die fillet radius on residual stress, a numerical model of liquid nitrogen
biological container cylinder is established. The test scheme is designed by
Box-Benhnken response surface method, and numerical simulation calculation is
carried out by Abaqus software. The results show that the maximum residual
stress of the cylinder occurs at the upper end of the cylinder and at the
junction between the cylinder and the head, and the distribution and magnitude
of residual stress on the head are basically the same. The smaller the blank holder force, the greater the residual stress and
the easier it is to wrinkle. The larger the die fillet radius, the greater the
residual stress but the harder it is to wrinkle. Friction coefficient has
little effect on residual stress.
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Study on Energy Saving Technology
for Tail Gas Incinerator in Natural Gas Purification Unit based on Dynamic
Prediction of Acid Dew Point of Flue Gas
Tan Zhaoming, Wei Jinghui, Zhou Qulan, Zhang Wenbin, Li Na, Liu Shicheng
2024, 41 (3):
41-46.
In
the original design of the waste heat boiler of tail gas incinerator in the
high sour natural gas purification units in Puguang Gas Field, high sulfur
content (about 400-800 mg/m3) of the flue gas after combustion leads
to high acid dew point temperature of flue gas, so the designed flue gas
temperature of waste heat boiler is high, resulting in low thermal efficiency (only
about 62-70%) of the entire waste heat boiler.
However, the sulfur content of the flue gas during actual operation of the incinerator
is about 150-370 mg/m3, so the actual acid dew point temperature is below
185℃. Therefore, an algorithm is proposed to dynamically predict the acid dew
point temperature of flue gas according to the sulfur content of flue gas, and
a thermal analysis platform is established for incinerators and waste heat
boilers. Since the heat absorption of the superheater of waste heat boiler in
the special water-side process of "two intakes and one outtakes" is far
greater than that of evaporator and economizer, the idea that "the steam
quality can be ensured only by simultaneously installing superheater and economizer
" is proposed. The transformation scheme of dynamically reducing the flue
gas temperature under different working conditions is given, which can control
the reasonable flue gas temperature in real time to prevent acid dew point corrosion,
maximize the recovery of heat energy of the flue gas from incinerator, and
realize an annual gas saving of 3.69% while ensuring the production and quality
of superheated steam.
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Application of Procurement
Progress Monitoring based on a PE Project of Country S
Han Mingkuo
2024, 41 (3):
47-50.
In
EPC projects, procurement is usually given a high cost weight ratio. The use of
advanced purchasing management mode and effective progress control measures
plays a crucial role in the overall progress control of projects. This paper
studies the construction of procurement progress system, progress monitoring,
corrective measures and other key links in a PE project of country S, which
provides reference for the procurement progress planning management of overseas
projects in the future.
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Discussion on Operation
Optimization of Absorption Stabilization System in FCC Unit
Li Jixiang
2024, 41 (3):
51-57.
This
article introduces the process characteristics and operation optimization
measures for absorption stabilization system in FCC unit, and analyzes how to
control the content of heavy components in dry gas to improve the total loss of
liquid yield based on the actual production of FCC unit. The control of C5 content in liquefied petroleum gas, the control of gasoline vapor pressure and
the maximization of economic benefits are also discussed. At the same time, the
energy consumption of this system under quality and yield control is explained,
and some corresponding suggestions are put forward for operational ideas,
control measures and advanced instrument control technologies.
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Equipment Layout and Piping
Layout Design for Alkyl Aluminum Preparation Area
Zhao Zhengyao
2024, 41 (3):
58-61.
Alkyl
aluminum is widely used in plants that produce polyethylene. This article
introduces the equipment layout and piping layout design scheme for alkyl aluminum
preparation area through the engineering design of multiple gas-phase polyethylene
plants at home and abroad and based on the chemical characteristics of alkyl aluminum
medium and the industry standards. This design scheme is still used today and
has been applied in multiple gas-phase polyethylene plants, indicating that this
equipment layout and piping layout design scheme for alkyl aluminum preparation
area is feasible and reasonable.
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Problems found during Project
Return Visit and the Solutions
Wang Weiyong
2024, 41 (3):
62-64.
Petrochemical units are
featured by complex processes from design to construction and to production,
and excellent design is an important guarantee. The project management team
organizes and coordinates the overall project operation and skillfully connects
the design party and the construction party. The project manager from the
design party should be familiar with the technical characteristics of each discipline,
have a certain ability to foresee, and inform the owner or organize technical
exchanges in a timely manner during project implementation. Project managers
pay special attention to risk avoidance and ensure that the design meet
relevant codes and standards. Design return visit aims not only to review the
design level, the accuracy of the scheme and the process to transform theory into
practical operation for producing on-spec products, but also to achieve design
improvement. The feedback from users also “represents” the professional level
and overall planning rigor of project managers.
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Supervisor: China petrochemical corporation