Total Systems Approach to Reduce Fouling and Improve System Efficiency Using Hydrogen Sulfide Scavengers

2021 ◽  
Author(s):  
James Alexander McRae ◽  
Willem-Louis Marais ◽  
Alyn Jenkins
Keyword(s):  
Hydrogen Sulfide ◽  
Systems Approach ◽  
Sulfur Removal ◽  
Holistic Approach ◽  
Shale Formations ◽  
Cotton Valley ◽  
Historical Issues ◽  
Scavenging Efficiency ◽  
Oil Gas ◽  
Solids Deposition

Abstract The Cotton Valley sand and Haynesville shale formations are situated in East Texas, USA, producing oil, gas, and condensate on land. Most of the producing assets are mature and souring, and the presence of hydrogen sulfide in the produced fluids and gas provides both operational concerns in terms of solids deposition and asset integrity in the production facilities as well as complexity when considering the processing, export, and sale of condensate and gas. Produced gas was traditionally treated with MEA triazine hydrogen sulfide scavenger prior to liquification by LNG plant. There have been historical issues with both the levels of hydrogen sulfide left in the gas and also solids formation in the process, which threatened periodic shutdown of the LNG plant. A holistic approach was used to improve the overall sulfur removal process. This includes the reduction or elimination of solids formation as well as improvement in the system scavenging efficiency. The approach considered current operating procedures, system parameters, equipment design (contactors), and H2S scavenger chemistry.

ZERON 25

Alloy Digest ◽  
1995 ◽  
Vol 44 (3) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Hydrogen Sulfide ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Oil Field ◽  
Localized Corrosion ◽  
Oil Gas

Abstract ZERON 25 is an alloy developed to combat severe oil field duties where oil, gas, water are contaminated with high levels of chlorides and hydrogen sulfide. The alloy has good mechanical strength and resistance to localized corrosion. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-584. Producer or source: Weir Material Services Ltd.

scholarly journals A Review of Reductionist versus Systems Perspectives towards ‘Doing the Right Strategies Right’ for Circular Economy Implementation

Systems ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 38
Author(s):  
Raquel Balanay ◽  
Anthony Halog
Keyword(s):  
Circular Economy ◽  
Systems Approach ◽  
Holistic Approach ◽  
Comprehensive Analysis ◽  
Unintended Consequences ◽  
Review Reports ◽  
The Right ◽  
Business As Usual ◽  
Analytical Frameworks ◽  
Reductionist Approach

This systematic review examines the importance of a systems/holistic approach in analyzing and addressing the footprints/impacts of business-as-usual activities regarding the development of a circular economy (CE). Recent works on why current CE approaches have to be examined in terms of reductionist vs. systems perspectives are reviewed to tackle questions pertaining to the right or the wrong way of CE implementation. ‘Doing the right thing right’ is essential for sustainability—the ultimate goal of a CE, which must be viewed as a system to begin with. The limited reductionist approach overlooks and thus cannot prognosticate on the formidable unintended consequences that emerge from ‘doing the right things wrong’, consequences that become too costly to undo. The systems approach, being holistic, is complicated and difficult to pursue but open to exciting opportunities to integrate innovations in CE analysis and implementation. Complexity is an inherent downside of the systems approach. However, both approaches are complementary, as reductionist models can be combined to create a system of comprehensive analysis to correct the approach towards implementation of current CE initiatives. This review reports that advancements in systems analytical frameworks and tools are highly important for creating general guidelines on CE analysis and implementation.

scholarly journals Active residents in care homes: A holistic approach to promoting and encouraging meaningful activity for residents living in care homes: Innovative Practice

Dementia ◽  
2017 ◽  
Vol 18 (5) ◽  
pp. 1942-1947 ◽  
Author(s):  
Raymond Smith ◽  
Julia Wood ◽  
Fiona Jones ◽  
Liezl Anderson ◽  
Michael Hurley
Keyword(s):  
Residential Care ◽  
Systems Approach ◽  
Care Home ◽  
Family Members ◽  
Occupational Therapists ◽  
Holistic Approach ◽  
Care Homes ◽  
Care Home Staff ◽  
Meaningful Activity ◽  
Whole Systems

The active residents in care homes intervention aim to promote meaningful activity among care home residents. Residents, family members and staff from three residential care homes in South London are participating. It is a whole systems approach which involves formal and ‘on the floor’ training to empower care home staff to facilitate activity. Training is delivered by two occupational therapists, a physiotherapist and a rehabilitation assistant. This paper describes the active residents in care homes intervention, the evaluation methods and discusses some preliminary findings.

scholarly journals Removal of sulfur contaminants from biogas to enable direct catalytic methanation

2019 ◽  
Author(s):  
Christian Dannesboe ◽  
John Bøgild Hansen ◽  
Ib Johannsen
Keyword(s):  
Hydrogen Sulfide ◽  
Dimethyl Sulfide ◽  
Renewable Energy Sources ◽  
Sulfur Removal ◽  
Carbonyl Sulfide ◽  
Acidithiobacillus Thiooxidans ◽  
Carbon Utilization ◽  
Combined System ◽  
Renewable Biomass ◽  
Biogas Reactor

AbstractIn the near future, renewable energy sources will replace fossil energy. To allow full carbon utilization of renewable biomass, we have demonstrated a possible integration between a biogas reactor, an electrolysis unit, and a catalytic methanation reactor. Stringent removal of all sulfur contaminants in raw biogas is required to enable this integration. We demonstrate how existing bulk sulfur removal solutions, like a biotrickling filter loaded with Acidithiobacillus thiooxidans and impregnated activated carbon, are unable to meet this requirement. Only the main sulfur contaminant hydrogen sulfide (H2S) can effectively be removed. Contaminants carbon disulfide (CS2), dimethyl sulfide (DMS), and carbonyl sulfide (COS) will leak through the carbon filter, long before hydrogen sulfide can be detected. Utilization of surplus oxygen from the combined system is proven problem free and allows sulfur removal without introducing contaminants. Provided that a recommended sulfur guard is included, the proposed design is ready for full-scale implementation.

Reactions between Hydrogen Sulfide and Sulfuric Acid:  A Novel Process for Sulfur Removal and Recovery

2000 ◽  
Vol 39 (7) ◽  
pp. 2505-2509 ◽  
Author(s):  
Qinglin Zhang ◽  
Ivo G. Dalla Lana ◽  
Karl T. Chuang ◽  
Hui Wang
Keyword(s):  
Hydrogen Sulfide ◽  
Sulfuric Acid ◽  
Sulfur Removal ◽  
Removal And Recovery

Use of Advanced Austenitic and Duplex Stainless Steels for Applications in Oil & Gas and Process Industry

2013 ◽  
Vol 794 ◽  
pp. 645-669 ◽  
Author(s):  
Pasi Kangas ◽  
Guo Cai Chai
Keyword(s):  
Stainless Steel ◽  
Hydrogen Sulfide ◽  
Organic Acids ◽  
Chemical Industry ◽  
Stainless Steels ◽  
Duplex Stainless Steels ◽  
Process Industry ◽  
Gas Industry ◽  
Product Forms ◽  
Oil Gas

Stainless steels are widely used in the Oil & Gas and chemical process industry. This group of materials is today available in a large variety of alloy compositions, and practically all product forms needed for a construction are available. A historical view and application examples are given on the stainless steel evolution, from the standard grades used in chemical processes to todays most advanced applications in the chemical and oil & gas industry, where demands on reliable and long lasting solutions are necessary. The influence of alloying elements on the properties and manufacturability is described. The chemical industry is a very wide definition of a large group of industries with very different products, from plastics and organic acids to fertilizers, drugs and pesticides. Applications of stainless steels within the chemical industry are described. The first example is organic acids, where the use of high alloyed duplex stainless steels such as UNS S32205 and UNS S32750 have been successful. Another example is phosphoric acid applications, where the aggressiveness of the process solution depends very much on the fluoride and chloride content of the rock phosphate. In sulfuric acid, the material of construction is very much dependent on the acid concentration and temperature. Nitric acid is another common fertilizer acid which is highly oxidizing, and thereby demands stainless steels with high chromium content but with low molybdenum contents. The Oil & Gas industry uses very high quantities of carbon steel and stainless steel in their constructions. The oil wells are defined as sweet when the well contains carbon dioxide and no substantial amounts of hydrogen sulfide, when there is hydrogen sulfide present in the well, the wells are defined as sour. An overview on materials depending on the application is given. In subsea applications, hydraulic control lines (umbilicals) are used for control of valves and for methanol injection in subsea platforms. UNS S32750 is a high strength duplex stainless steel which today is the first choice for umbilicals and has been chosen for a very large amount of umbilical projects worldwide. The newly developed hyper duplex stainless steels with a combination of even higher corrosion resistance and strength are introduced for applications in oil-gas industry. The possibilities with stainless steels are endless, and new alloys are constantly being developed to meet industrial challenges of today and in the future. By choosing the right stainless steel grade, it is possible to find a solution to almost all challenges in the Oil & Gas and Process industry.

scholarly journals A systems thinking approach to understanding the challenges of achieving the circular economy

2020 ◽  
Author(s):  
Eleni Iacovidou ◽  
John N. Hahladakis ◽  
Phil Purnell
Keyword(s):  
Systems Thinking ◽  
Value Chain ◽  
Circular Economy ◽  
Systems Approach ◽  
Transformational Change ◽  
Holistic Approach ◽  
Time Investment ◽  
Material Component ◽  
Systems Thinking Approach ◽  
The Way

AbstractCircular economy (CE) is extensively discussed around the globe. Presently, discussions are mostly concerned with the importance of achieving CE and the benefits associated therewith, with the various barriers surrounding its implementation being less debated. Understanding the context in which circularity can flourish is a prerequisite in building the capabilities to deal with the multi-faceted challenges that currently hamper progress in closing the material, component and product loops. In this study, we discuss the importance of systems thinking in understanding the way resource recovery systems operate, and in promoting deep transformational change. We suggest that transformational change needs to go beyond closing materials, components and products (MCPs) loops, and promote sustainability in the way resources are exploited, used and managed throughout the system. By adopting a system of systems approach, we postulate that there are five interconnected sub-systems that need to be considered for supporting transitions to CE, namely, resource flows and provisioning service; governance, regulatory framework and political landscape; business activities and the marker; infrastructure and innovation; and user practices. This holistic approach provides a useful means to cutting through systemic complexity, and focuses on the dynamics between processes, values and actors in the value chain, and their dependence on cultural, spatial and temporal characteristics. We conclude that a systems-based approach can build up the capabilities required to identify and understand persistent linear trends and, in turn, support forward-thinking and time investment in enabling sustainable transitions. This, in turn, can help to align priorities and transform our current practices, speeding up the process of closing the MCP loops in a sustainable manner.

Evolution of a holistic systems approach to planning and managing road safety: the Victorian case study, 1970–2015

2018 ◽  
Vol 24 (Suppl 1) ◽  
pp. i19-i24 ◽  
Author(s):  
Carlyn Muir ◽  
Ian R Johnston ◽  
Eric Howard
Keyword(s):  
Institutional Change ◽  
Road Safety ◽  
Systems Approach ◽  
Holistic Approach ◽  
Institutional Leadership ◽  
The Road ◽  
Adoption And Implementation ◽  
History Of ◽  
Safety Features

BackgroundThe Victorian Safe System approach to road safety slowly evolved from a combination of the Swedish Vision Zero philosophy and the Sustainable Safety model developed by the Dutch. The Safe System approach reframes the way in which road safety is viewed and managed.MethodsThis paper presents a case study of the institutional change required to underpin the transformation to a holistic approach to planning and managing road safety in Victoria, Australia.ResultsThe adoption and implementation of a Safe System approach require strong institutional leadership and close cooperation among all the key agencies involved, and Victoria was fortunate in that it had a long history of strong interagency mechanisms in place. However, the challenges in the implementation of the Safe System strategy in Victoria are generally neither technical nor scientific; they are predominantly social and political. While many governments purport to develop strategies based on Safe System thinking, on-the-ground action still very much depends on what politicians perceive to be publicly acceptable, and Victoria is no exception.ConclusionsThis is a case study of the complexity of institutional change and is presented in the hope that the lessons may prove useful for others seeking to adopt more holistic planning and management of road safety. There is still much work to be done in Victoria, but the institutional cultural shift has taken root. Ongoing efforts must be continued to achieve alert and compliant road users; however, major underpinning benefits will be achieved through focusing on road network safety improvements (achieving forgiving infrastructure, such as wire rope barriers) in conjunction with reviews of posted speed limits (to be set in response to the level of protection offered by the road infrastructure) and by the progressive introduction into the fleet of modern vehicle safety features.

Sign in / Sign up

Export Citation Format

Share Document