Combining traditional uop hazop analysis with dynamic simulation determine consequences of deviations from normal design can identify new, unrecognized hazards and issues hazop teams. Nov 21, 2011 the hazop hazard and operability method is a widely used technique for identifying the hazards on process facilities. It is particularly well suited for high purity separations since any degree of separation can be obtained with a. For each impact event, the team lists all the initiating causes in. In lees loss prevention in the process industries fourth edition, 2012. Conceptual design of reactive distillation columns using stage composition lines matthias groemping, ramonam dragomir and megan jobson degussa ag, hanau, germany. The primary strength of hazop is that it presents a systematic, disciplined and documented approach. Hydrotreaterdistillation column hazard analysis report. Oil refinery, process safety, process safety management, semi quantitative hazop, vacuum. Hazop and whatif studies focus on a system or node level and are dependent on accurate process safety information. Application of extended hazop and eventatree analysis for. Concentrate on one location in the process parameter.
The vertical shell houses the column internals and together with the condenser and reboiler, constitute a distillation column. Distillation troubleshooting database of published case histories. Assessing safety in distillation column using dynamic. Hazop closure when all followup actions are complete, the responsible officer shall note on the hazop study record of discussions sf 1909 that all items have been completed and make reference to the inspection reference number in cintellate. Common mistakes when conducting a hazop and how to avoid them an important part of ensuring the success of a hazop study is to understand the errors that can. Thus typical unit operations in a chemical plant, such as reactors and distillation columns can be subjected to a analysis individually. Combining traditional uop hazop analysis with dynamic simulation determine consequences of deviations from normal design can identify new, unrecognized hazards and issues hazop teams can test effectiveness of strategies for emergency situations provides significant added value to uop hazop analysis and reports.
This is a short extract from risktecs hazop study teaching module. Chapter 1 troubleshooting distillation simulation continueds case reference plant column brie description soms fe morals 149 91 acetoneda of limited data incorrectly accounted a commercial simulatio n regressio for dimerization of acetone to daa. In this simulation study the operation of conventional distillation column column with one feed and two products was investigated with the application of aspenplus dynamicstm software. Semi quantative hazop in vacuum distillation column. Practica in process engineering ii distillation introduction distillation is the process of heating a liquid solution, or a liquidvapor mixture, to derive o a vapor and then collecting and condensing this vapor. August 5, 2016 by panorama consulting engineers india hazop 0 comments. With these estimates a risk matrix can be used to estimate risk for a cause. The studies on distillation column suggest the following objectives.
Pdf application of hazard and operability study hazop in. A schematic of a typical distillation unit with a single feed and two product. Institute of chemical and environmental engineering, faculty of chemical and food technology, slovak university of technology, radlinske. An obvious example is a distillation column, in which pressure, temperature, composition and flowrate of reflux, for example are clearly interrelated. A hazop or other hazard identification procedure is done first. A liquid feed containing the mixture of two or more liquids enters the column at one or more points. Bowtie studies are a detailed pictorial representation and assessment of a top.
If the subject at hand is about organizing and carrying out a hazop on a packed column operation, then the first and foremost thing that should be done and confirmed is. Pdf application of hazard and operability study hazop. Pdf risk assessment and management techniques are used in industrial activities to. Doc hazop for distillation column parameter guideword. Cost, chemical interactions and equipment needs change in a nonlinear fashion as increased output is required. It is one of the techniques commonly accepted by regulators. A hazop study identifies hazards and operability problems. The hazard and operability hazop study is the most commonly used process hazard analysis pha method in the world today. In particular, hazop is often used as a technique for identifying potential hazards in a system and identifying operability problems. The numbers of flowpaths of liquid on tray are 1, 2, 3 or 4 as per liquid capacity requirement of column. Even those who are not familiar with the hazards analysis process will often have heard of the term hazop, even if they are not really sure what it means.
Its purpose is to reduce risk and ensure the safety of workers in plant environments. A risk analysis of a batch distillation unit is described. Distillation principles a distillation column is a series of equilibrium flashes with two feeds and two product streams exiting liquid is at bubble point exiting vapor is at dew point compositions obey the. Hazop on the btgbtl reactor rotating cone reactor biomass particles are fed to the pyrolysis reactor together with an excess flow of sand, which acts as circulating heat carrier material.
A fractionating distillation column is used to make this process more efficient. Distillation principles chemical engineering, 200711, rvce. Distillation column an overview sciencedirect topics. Lopa articles the following were the two definitive papers on the topic of layer of protection analysis lopa. Product quality control to maintain either the overhead or bottom composition at a specified value 2. To achieve full benefits from a hazop study, it has to be properly documented and followed up. Hazop online training course free certification online. The concept involves investigating how the plant might deviate from the design intent. If, in the process of identifying problems during a hazop study, a solution becomes. Material balances control to maintain its column holdup and overhead and bottom inventories between maximum and minimum limits. The hazop study method can be used on a wide variety of processing units in plants including storage, distillation, filtration and so on. Dec 01, 2015 as would be expected, the same deviation generally causes the alteration of more than one process parameter, and therefore could be entered in more than one place in the spreadsheet. The distillation column is made up of a series of stacked plates. A hazard and operability analysis hazop is a risk management technique used to identify potential hazards and functional flaws in existing or planned plant systems.
The primary strength of hazop is that it presents a systematic. This method allows us to select our units or equipment. Hazop analysis training, certification, online course in. Distillation troubleshooting database of published case. The application of hazop, a process hazard identification and. The hazop hazard and operability method is a widely used technique for identifying the hazards on process facilities. Hazid can be conducted at a unit or system level with little documentation other than a design concept. In this article, a systematic framework based on extended hazop and event. Common mistakes when conducting a hazop and how to avoid them. The analysis has been carried out at several stages during plant design, construction, and. This resulted with nonideal behavior prediction for this ideal pair. Modelbased hazop study of a real mtbe plant juraj labovsky. A distillation column is a heat engine that instead of work produces a decrease of entropy, i.
Jan 16, 2019 this is a short extract from risktecs hazop study teaching module. The hazop table may also include estimates of the frequency for each cause and severity for each consequence. To describe the degree of separation between two components in a column or in. From a capacity viewpoint, a liquid rate greater than 6 gpm. Kjaergaard grindsted products as riso national laboratory abstract.
Apr 22, 2014 this information shall be entered into the recommendations column on the hazop study record. May 11, 2007 the use of dynamic simulation for safety. From safety point of view, there are significant numbers of safety disturbances in recent years based on kisters surveys on column malfunction histories kister, 2003. Graphical determination of a distillation column design step 1. Hazop international journal of occupational hygiene. Every processing plant would have typical units that are engaged in a particular type of operation such as for example fluidized bed reactors, catalytic crackers, vaccum distillation and others. One way of classifying distillation column type is to look at how they are operated. Hazop closure when all followup actions are complete, the responsible officer. Consider each process variable individually f, t, l, p, composition, operator action, corrosion, etc. This information shall be entered into the recommendations column on the hazop study record. Hazop is based on the use of guidewords, which question how the design intention might not be achieved at each part 2 of the system. Scribd is the worlds largest social reading and publishing site. Hazop tables usually list deviations, causes, consequences, safeguards, and recommendations.
The hazop method identifies deviations from design intent by applying guide words, such as no, more and less, to aspects of the design intent such as flow. Even those who are not familiar with the hazards analysis process will. That is, the column is charged with a batch and then the distillation process is carried out. From safety point of view, there are significant numbers of safety. Distillation column is the most commonly applied separation processes used in chemical industries. Hazop short for hazard and operability study is a well known hazard analysis tool used for process safety management and hse risk assessment of plants and facilities. Similarly if one has a batch reactor, then one can do a hazop analysis of reactor and nothing else. See the picture below to better understand how columns work. Aug 05, 2016 distillation column designmust understand and determine five key design elements for project success. In the simplest case, the products of a distillation process are limited to an overhead distillate and a bottoms, whose compositions.
Every processing plant would have typical units that are engaged in a. Batch columns in batch operation, the feed to the column is introduced batchwise. Common mistakes when conducting a hazop and how to avoid them an important part of ensuring the success of a hazop study is to understand the errors that can cause the team to lose focus. Application of hazard and operability study hazop in evaluation of health, safety and environmental hse hazards article pdf available july 2012 with 1,884 reads how we measure reads.
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