11.3 Reducing Tower Reboiler Duty and Reflux Flow 370
11.4 Reducing Stripping Steam Utilization 383
11.6 Reducing Reactor Treat Gas, Recycle Gas Flows 397
12 Tower Product Quality Controls 410
12.1 Tower Basics 412
12.2 Two-product Towers - Process Variable Summary 412
12.3 Two-product Towers - Common Product Quality Control CV-MV Pairs 419
12.4 Towers with Sidestream - Process Variable Summary 427
12.5 Towers with Sidestream - Common Product Quality Control CV-MV Pairs 432
12.6 Cutpoint, Fractionation, and Their Impact on Tower Operations 435
12.7 Two-product Towers - Overview of Conventional Advanced Control Applications 443
12.8 Towers with Sidestream - Overview of Conventional Advanced Control Applications 453
12.9 Two-product Towers - Conventional Advanced Control Application Examples 463
12.10 Towers with Sidestream - Conventional Advanced Control Application Examples 485
13 Fractionator Product Quality Control 497
13.1 Fractionator Unit Characteristics 499
13.2 Feed True Boiling Point (TBP) Distillation Curve, Cutpoint, and Fractionation 505
13.3 Crude Distillation Unit, CDU - The Most Important Primary Fractionator 515
13.4 Reactor Effluent Product Separation Section Main Fractionators 541
14 Reactor Conversion Control 554
14.1 Reactor Control Fundamentals 555
14.2 Reactor System Unit Configurations 564
14.3 Reactor System Control Objectives, CVs, MVs, and DVs 581
14.4 Conventional Reactor Advanced Control Applications 584
Control, Inlet Temperature Maximization 608
References 613
Index 615
"Process design is based on steady state conditions -- process variables, and physical and chemical parameters, are assumed known, fixed and time invariant. However, refinery and chemical plant operations are never at steady state, and it is the transient nature of real-world operations that makes process control an essential requirement for achieving safe and acceptable plant performance. The primary roles of the process control strategies implemented in an operating plant are to (i) hold plant operations at a desired operating point despite process upsets, (ii) provide smooth, fast and safe transitions from one operating point to another, and (iii) keep plant operations on the safe side of limiting process constraints. The control strategy design fundamentals described and discussed are applied to develop numerous specific control strategies in a wide variety of realistic process configurations."--
About the Author Alan M. Kugelman, PhD, has more than 40 years’ experience in process control application design and implementation in capital projects, DCS migration projects and DCS modernization projects. Working for ExxonMobil Research and Engineering Company (Florham Park, NJ, later in Fairfax, Va.), he developed his process control applications design and implementation expertise during three onsite assignments at ExxonMobil sites in Europe and Japan. He then supported ExxonMobil control applications activities, in both refineries and chemical plants worldwide, from central engineering offices in Brussels, Florham Park, and Fairfax. He developed, and taught company-administered control application training courses to site control engineers worldwide.