Generic Approach of Using Dynamic Simulation for Industrial Emission Reduction under Abnormal Operations: Scenario Study of an Ethylene Plant Start-up

2014 ◽  
Vol 53 (39) ◽  
pp. 15089-15100 ◽  
Author(s):  
Ha Dinh ◽  
Shujing Zhang ◽  
Yiling Xu ◽  
Qiang Xu ◽  
Fadwa Eljack ◽  
...  
Keyword(s):  
Dynamic Simulation ◽  
Emission Reduction ◽  
Industrial Emission ◽  
Ethylene Plant ◽  
Start Up ◽  
Scenario Study

scholarly journals Research on green credit risk measurement based on Pair Copula grouping model--From the perspective of Commercial Banks

2019 ◽  
Vol 118 ◽  
pp. 03025
Author(s):  
Han Sun ◽  
Hui-zi Ma ◽  
Xiang-rong Wang
Keyword(s):  
Credit Risk ◽  
Commercial Banks ◽  
Emission Reduction ◽  
Optimal Combination ◽  
Environmental Restoration ◽  
Enumeration Algorithm ◽  
Combination Strategy ◽  
Industrial Emission ◽  
Credit Risk Measurement ◽  
Different Levels

In order to measure the portfolio credit risk of commercial banks in energy saving and environmental protection industry accurately, this paper proposes the value VaRGP of green credit risk and constructs a related model based on Pair Copula grouping model, VaR method (combined with enumeration algorithm).The results show that the credit schemes that commercial banks focus on investing in two areas of industrial emission reduction and environmental restoration is consistent with the conclusion that the two fields have the strongest development momentum.Besides, at different levels of confidence, all of VaRGP have passed the return test, which fully shows that the model is feasible and effective to measure the credit risk in different green fields and to formulate the optimal combination strategy.

Combined-Cycle Start-Up Procedures: Dynamic Simulation and Measurement

2016 ◽  
Author(s):  
Nicolas J. Mertens ◽  
Falah Alobaid ◽  
Bernd Epple ◽  
Hyun-Gee Kim
Keyword(s):  
Power Plant ◽  
Dynamic Simulation ◽  
Steam Generator ◽  
Heat Recovery ◽  
Thermal Stresses ◽  
Measurement Data ◽  
Combined Cycle ◽  
Heat Recovery Steam Generator ◽  
Start Up ◽  
Fast Start

The daily operation of combined-cycle power plants is increasingly characterized by frequent start-up and shutdown procedures. In addition to the basic requirement of high efficiency at design load, plant operators therefore acknowledge the relevance of enhanced flexibility in operation — in particular, fast start-ups — for plant competitiveness under changing market conditions. The load ramps during start-up procedure are typically limited by thermal stresses in the heat recovery steam generator (HRSG) due to thick-walled components in the high pressure circuit. Whereas conventional HRSG design is largely based on simple steady-state models, detailed modelling and dynamic simulation of the relevant systems are necessary in order to optimize HRSG design with respect to fast start-up capability. This study investigates the capability of a comprehensive process simulation model to accurately predict the dynamic response of a triple-pressure heat recovery steam generator with reheater from warm and hot initial conditions to the start-up procedure of a heavy-duty gas turbine. The commercial combined-cycle power plant (350 MWel) was modelled with the thermal-hydraulic code Apros. Development of the plant model is based on geometry data, system descriptions and heat transfer calculations established in the original HRSG design. The numerical model is validated with two independent sets of measurement data recorded at the real power plant, showing good agreement.

scholarly journals Pressure-driven dynamic simulation of start up and shutdown procedures of distillation columns in air separation units

2019 ◽  
Vol 147 ◽  
pp. 98-112 ◽  
Author(s):  
Robert Kender ◽  
Bernd Wunderlich ◽  
Ingo Thomas ◽  
Andreas Peschel ◽  
Sebastian Rehfeldt ◽  
...  
Keyword(s):  
Dynamic Simulation ◽  
Air Separation ◽  
Distillation Columns ◽  
Start Up ◽  
Pressure Driven

Dynamic simulation of a triple-pressure combined-cycle plant: Hot start-up and shutdown

Fuel ◽  
2016 ◽  
Vol 167 ◽  
pp. 135-148 ◽  
Author(s):  
Nicolas Mertens ◽  
Falah Alobaid ◽  
Thomas Lanz ◽  
Bernd Epple ◽  
Hyun-Gee Kim
Keyword(s):  
Dynamic Simulation ◽  
Combined Cycle ◽  
Start Up ◽  
Hot Start ◽  
Combined Cycle Plant

Dynamic Process and Accident Simulations as Tools to Prevent Industrial Accidents

2009 ◽  
Vol 4 (2) ◽  
Author(s):  
Sara Brambilla ◽  
Davide Manca
Keyword(s):  
Dynamic Simulation ◽  
Dynamic Process ◽  
Chemical Processes ◽  
Minor Importance ◽  
Industrial Accidents ◽  
Start Up ◽  
Steady State Simulation ◽  
Dynamic Process Simulation ◽  
Central Tool

The dynamic simulation of chemical processes is an indispensable and central tool for process design, analysis, and operation. Compared to a steady state simulation, the dynamic process simulation has some outstanding advantages, such as the assessment of control system reliability before its implementation on the real plant, the planning and testing of start-up and shutdown procedures, the training of operators, the possibility to investigate the causes of previous accidents, and to determine the consequences of possible accidents. In particular, as far as the accidents are concerned, it is not of minor importance that they are an economic liability to the company and the community (Fewtrell and Hirst, 1998). Fewtrell and Hirst highlighted also that high-cost accidents have some common features. The coupled dynamic simulation of process and accidents allows identifying the aforementioned deficiencies while moving towards a more safe and productive management of chemical processes. This manuscript analyzes the possible plant/accident interactions and suggests the simultaneous dynamic integration of process simulators and accident simulators. In fact, to simulate a realistic accident dynamics, both the dynamics of the plant and of the accidental event should be run simultaneously since they are biuniquely interrelated and they influence one another. The manuscript investigates the feedbacks and interactions between the process and the accident by means of a specific case study.

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