Most claus sulfur plants contain two or three catalytic stages and can achieve 9497% sulfur recovery efficiency. The result shows the complete conversion of sour gas to. Sulphurpro for the flowsheet solution process in this study. In this section, the modified claus process is analyzed from chemical and processing perspectives. Modeling a claus process reaction furnace via a radical kinetic scheme sauro pierucci, eliseo ranzi and lucio molinari1 cmic dept. Natural gas mainly methane is continuously cofired with acid gas. Pdf a simulation of claus process via aspen hysys for. In the typical modified claus process, the acid gas feed is partially oxidized to generate sulfur dioxide so 2, which then reacts with the remaining hydrogen sulfide h 2 s over a catalyst to produce sulfur. Assess claus unit performance by simulation part ii.
In order to develop a suitable kinetic model for prediction of reaction furnace and waste heat boiler effluents, several reaction. The claus process is the best method to recover sulfur from acid gases that contain hydrogen sulfide. Pdf the claus process has been known and used in the industry for over 100 years. Chemical engineering process simulation 1st edition. Acid gas from the acid gas removal agr process, along with overhead gases from sour water stripping and a small amount of recycle from the tail gas treating unit not shown, are burned in the claus furnace with sufficient air or oxygen to produce an overall gas mixture with the. As expected, two ideal reactors showed much different behaviors in terms of reactant conversion and operating. H 2 s is burned and then reduced to form elemental sulfur. H2s, a toxic gas present in raw natural gas and in oil fields, is converted to sulfur using the claus process in sulfur recovery units. In order to develop a suitable kinetic model for prediction of reaction furnace and waste heat boiler effluents, several reaction schemes were tested and the best reaction set was selected. Design and optimization of integrated amine sweetening, claus sulfur and tail gas cleanup units by computer simulation. Chemical process simulation the objective of this course is to provide the background needed by the chemical engineers to carry out computeraided analyses of largescale chemical processes. The sulfur recovery unit sru is based on the modified claus process, which is a twostep reaction scheme overall. The model considered two ideal reactors, a continuous stirred tank reactor and a plug flow reactor.
Course participants will learn how to build, evaluate and optimize steady state process flowsheets using unisim design, as well as learn techniques and shortcuts to efficiently use the program. Modeling and simulation of an improved ammoniabased desulfurization process for claus tail gas treatment yuyin tang,ab yang gao,c dan liu,b fenglian zhang,b siqiu qu,c zhengping hao,bd. First patented in 1883 by the chemist carl friedrich claus, the claus process has become the industry standard. Major concern will fall on steadystate processes with hands on experiences on chemcad simulator cc5. The management at winsim has made a business decision to concentrate specifically on process simulation. Chemical engineering process simulation is ideal for students, early career researchers, and practitioners, as it guides you through chemical processes and unit operations using the main simulation softwares that are used in the industrial sector. The main objective of this thesis is to perform a simulation of sulfur recovery by the claus process using aspen hysys. Tail gas from the claus sulfur recovery unit sru is heated in an inline burner before entering the hydrogenation reactor, where all sulfur species are converted to hydrogen sulfide h 2 s.
Design and optimization of integrated amine sweetening, claus. However, the traditional claus process does face limitations and various process improvements have been investigated in order to satisfy the increasingly stringent emission regulations and the need to process gas streams and fuels with higher sulfur content. Throughout the paper, there is discussion on issues concerning the use of simulation in industry. Sulfur recovery process value of process simulation for the sru. The unisim family of software products improves plant performance and overall business results for the process industry. An introduction to process simulation and aspen hysys for. Sulsim sulfur recovery in aspen hysys v9 aspentech. Process and plant design for 99% sulfur recovery from sour. Tail gas from the claus sulfur recovery unit sru is heated in an inline burner before entering the hydrogenation reactor, where all sulfur species are converted to hydrogen sulfide h2s. Design ii for windows is the only process simulator offered. This reduction in overhead costs is reflected in our competitive pricing.
Using a process simulator to improve sulphur recovery citeseerx. Kinetic modeling and optimization of claus reaction furnace. The claus process is a catalytic chemical process for converting gaseous hydrogen sulfide h 2 s into elemental sulfur s. Modeling and simulation of claus unit reaction furnace. A method for recovering sulfur is disclosed, comprising the steps of feeding an acid gas stream to a combustion furnace, condensing the cooled furnace stream to produce a first gas stream, feeding the first gas stream to a first adsorber comprises a molecular sieve, feeding the first hot dry gas stream to a first catalytic reactor, cooling the first catalytic outlet stream in a first condenser. Fundamentals process modelling using unisim design. The modified claus process is used to achieve a recovery of 97%. Figure 1 shows a simplified shell claus offgas treatment scot tail gas treating unit tgtu.
Sulfur recovery from acid gas using the claus process and. Selection of amine vendors tends to be more specialized, with a few firms available for packages that include process licensing and amine supply. The aim of this study is to get a simulation that is suitable for the characterization of sulfur recovery units. Modeling and optimization of an industrial claus process. Effect of o2 concentration on the reaction furnace. In this study, it was shown that only factors which could affect the conversion of h2s were the. A model was developed to simulate the reaction, concentration field, flow field, and temperature distribution inside a claus reactor for converting hydrogen sulfide to sulfur. To achieve the desired 99% sulfur recovery, a tail gas unit tail gas unit must be added. In this section, the reliability and accuracy of developed mathematical model of claus process is validated by comparing the simulation results with the available plant data in a domestic plant. Using operational data of an industrial plant, this paper proposes a general framework for development of a plantwide simulation model for modified claus process based on simultaneous data reconciliation and parameter. Mathematical modelling and simulation of adsorptive moving bed reactor for claus process article pdf available in iop conference series earth and environmental science 384. Simulate the sulfur recovery process in aspen hysys. Because of the complexities of the calculations in designing and analyzing these units, process simulation programs have become a necessity to optimize the units in any reasonable length of time.
Several researchers have investigated the modeling of the claus plant or specific unit operations of the claus process. Modeling thermal part of sulfur recovery unit and simulation. Claus process reactor simulation joel plawsky rensselaer polytechnic institute troy, ny 1. The key parameters of the modified claus process have been considered as the kinetic parameters of the main reactions taking place in the reactors.
Under the reaction conditions, the adsorption ability is limited by the temperature. Claus process reactor simulation comsol multiphysics. A dedicated sulsim sulfur recovery property package. Paper open access mathematical modelling and simulation of. In part 2 we assess the effect of oxygen enrichment on the same units performance. Selection of amine vendors tends to be more specialized, with a few firms available for packages that include process licensing and. Reduction in natural gas consumption in sulfur recovery. Claus process, reaction furnace, kinetic modeling, simulation.
The low and fluctuating demand and sale price of sulfur and its increasing production due to the discovery of new sour fields have mandated optimization studies to reduce the production cost. The modified claus process is characterized by several problems, namely poor instrumentation and no precise kinetic model for predicting the behaviour of the reactors. Claus process reactor 3 claus reactors contain a checkerwall to protect a downstream heat exchanger from the furnace and help mixing. Vendors of simulation software have been actively developing packages that contain models that only need input templates. The sulfur recovery process employs a modifiedclaus reaction that captures elemental sulfur from. Extended functionality and validation of sulsim sulfur. Modeling and simulation of an improved ammoniabased desulfurization process for claus tail gas treatment yuyin tang,ab yang gao,c dan liu,b fenglian zhang,b siqiu qu,c zhengping hao,bd xin zhangbd and zhaotie liu a an improved ammoniabased desulfurization technology was proposed, in which the produced excess. Pdf modeling and simulation of condensed sulfur in catalytic beds.
A solver block in sulphurpro is intended to determine the value of a parameter within an operating block needed to achieve a specification parameter in a selected stream. Claus was born in kassel in the german state of hessen. In this paper, the simulation of claus process was done, and. Abstract this introductory tutorial is an overview of simulation modeling and analysis. Claus process project gutenberg selfpublishing ebooks. Safe learning environment for students to gain confidence. Indeed, process simulation is a modelbased representation of chemical processes and unit operations in software. Figure 1 2 shows a typical process flow scheme of a 2stage straightthrough 3 claus sulfur recovery unit sru.
Modified claus process for acid gas with ammonia treatment. The aim of this study is to get a simulation that is suitable for the characterization of sulfur. The application of simulation involves specific steps in order for the simulation study to be successful. Pdf mathematical modelling and simulation of adsorptive. Project was the first stage of a process designed to model a claus reactor and determine the effects of introducing a static mixing element, a vectorwall, into the reactor. Hydrogenation reactor effluent is then cooled by generating low pressure lp steam, followed by additional. The claus process is the most significant gas desulfurizing process, recovering elemental sulfur from gaseous hydrogen sulfide. Equipment design and cost estimation for small modular. This book will help you predict the characteristics of a process using mathematical models and computeraided process simulation tools, as well as. First patented in 1883 by the scientist carl friedrich claus, the claus process has become the industry standard.
Unisim design is an intuitive and interactive process modeling offering that enables engineers to create steadystate and dynamic models for plant design, performance monitoring, troubleshooting, operational improvement, business planning and asset management. Pdf modeling and simulation of condensed sulfur in. A specialized sulfur recovery subflowsheet environment, as shown in figures 1 and 2. Heretofore, simulation programs have only been available for amine sweetening units and claus sulfur plants as separate, distinct abstract. Simulation and model estimation for modified claus furnace temperature vs. Reaction furnace has an essential role in claus unit and its performance affects process efficiency and other equipment performance, so, in the current work, furnace simulation is discussed. The following briefly describes the basic steps in the simulation process 6, 7. Design and optimization of integrated amine sweetening. Modeling a claus process reaction furnace via a radical.
Plantwide simulation model for modified claus process based. Regardless of the type of problem and the objective of the study, the process by which the simulation is performed remains constant. Optimization of claus sulfur recovery plants requires a reliable kinetic model to describe the reaction furnace and waste heat boiler. The process is commonly referred to as a sulfur recovery unit sru and is very widely used to produce sulfur from the hydrogen sulfide found in raw natural gas and from the byproduct sour gases containing hydrogen sulfide derived from refining petroleum crude oil and. The modifiedclaus process of converting hydrogen sulfide, sulfur. Reduction in natural gas consumption in sulfur recovery units. Simulation results show that adsorptive moving bed reactor has good performance in claus process. Ghasemian3 1department of chemical engineering, faculty of chemical engineering, tarbiat modares university, tehran, iran 2national iranian south oil company nisoc, ahwaz, iran. Introduction to modeling and simulation anu maria state university of new york at binghamton department of systems science and industrial engineering binghamton, ny 9026000, u. Modeling and simulation of condensed sulfur in catalytic beds of claus process. Wo2017120302a1 claus process for sulfur recovery with. A portion of the total h2s is burned in the reaction furnace to form so2.
Most claus sulfur plants contain two or three catalytic stages. Standalone sulsim has been fully integrated into aspen hysys by implementation of. Claus was born in kassel in the german state of hessen in 1827, and studied chemistry in marburg before he emigrated to england in 1852. A simulation of claus process via aspen hysys for sulfur. Modeling and simulation of an improved ammoniabased. Using operational data of an industrial plant, this paper proposes a general framework for development of a plantwide simulation model for modified claus process based on simultaneous data reconciliation. For these purposes, intake air and acid gas feed are classified into three different categories in terms of their composition. Design and construction of amine units is a standard practice for most major engineering firms. Simulation modeling and analysis can be time consuming and expensive.
Plantwide simulation model for modified claus process. Pdf a simulation of claus process via aspen hysys for sulfur. Usually one of two ways, namely an empirical model or an equilibrium model, is used for the. Highfidelity simulation models for a wide variety of process systems, equipment and units of operation, from process control to sophisticated upstream, refining and power generation plants. It is based upon a rigorous and highfidelity mathematical process model to provide a realistic dynamic response of a process unit. Disadvantages of simulation model building requires special training. Sulfur recovery simulation and tutorial simulation gses envision simulation is a realtime dynamic process simulation program used for operator training.
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