New Long Life Lubricant for Engines Burning Sour


Shell Lubricants is introducing into the market, a new member to the Mysella range of Gas Engine Lubricants. The new product, currently named Shell Mysella SL1278, has been especially formulated for gas engines running on all types of biogas, including gas produced from biomass or manure, sewage gas, and landfill gas. In this paper Shell will present findings of the research that has been executed during its development. The paper describes the challenges that different qualities of biogas impose on the engine and the lubricating oil. It describes what properties a lubricating oil for biogas operation should ideally have, and different formulation routes to achieve these. The performance of different candidate formulations is presented in the form of field trail resuls. Finally, this paper explains which candidate has been chosen to become the new Shell Mysella SL1278 and how the performance of this oil will help the operator to reduce cost of operations.

Total Cost of Ownership for Outdoor Enclosures


Operational cost of outdoor enclosures is driven by power consumption of the cooling system and the service cost to repair a failed system. Total Cost of Ownership must be factored into the initial configuration of any thermally- managed outdoor enclosure or cabinet. Although similarly equipped enclosures may have comparable capital costs, the long-term operational costs of the thermal management systems vary greatly.  Each of the thermal management technologies has varying operational costs, strengths, weaknesses, and environmental profiles where they excel.  Also, thermal management systems improve reliability and extend Mean Time Between Failure (MTBF) of enclosed electronics.  This white paper explains how each of these technologies affects Total Cost of Ownership of your outdoor enclosure.

Selecting Outdoor Enclosures for Utility and Smart Grid Electronics


Communication electronics, SCADA equipment, and batteries deployed along Transmission and Distribution line will require protection from the elements, thermal management to maintain the proper operating temperature ranges, and security to prevent malicious access and tampering. This white paper introduces utility operators to the relevant features and capabilities of enclosures, including the range of thermal management systems, power efficiency, acoustic management, security and intrusion prevention, and scalability and flexibility.

Fact or Fiction- benefits of inhibited verses uninhibited hydrocarbon oil for transformers



-Uninhibited and inhibited (naphthenic and iso-paraffinic) hydrocarbon transformer oils.

-Typical product features/benefits, and how these can be tested, assessed and improved, using examples from the latest generation of Shell products.

-Transformer manufacturers and utility companies – perceptions and findings from the field.

-Laboratory performance evaluation of the two product types, primarily in terms of oxidative stability. For mixed and pure uninhibited and inhibited oils.
-Shell recommendations on how to obtain maximum oil performance benefits.

-Conclusions - review of the relative merits of the two product types and confirmation of the benefits of inhibited versus uninhibited products.


Study and Design Considerations of HRSG Evaporators in Fast Start Combined Cycle Plants


Large heat recovery steam generators (HRSGs) are increasingly
required to be designed for cyclic operation and also required to meet faster startup
times. The ability of horizontal HRSGs cyclic operation has been discussed and
widely reported in literatures and studies. However, the operation and design life of
HRSGs become more important when the system is operated with fast startup
times.This paper deals with the effect of fast startups on evaporator design and looks at the impact to the overall design and operation of the HRSG. The paper provides a comparison to traditional startups, explains the need to verify the design of evaporators for fast startups, and analyzes design issues.

ASME and EuroNorm Compared for HRSG Design


Recently CMI completed a Heat Recovery Steam Generator for a 400 MW standard block CCPP in France, for which ASME code was used for the HRSG design. Regarding that project, CMI conducted an internal review based on the EuroNorm instead of the ASME code. The purpose of this exercise was to study and compare advantages and design features of ASME code versus EuroNorm. This paper presents the conclusions of the comparison and review that were undertaken.

Application of CFD Modeling in HRSG Evase Design


The paper presents work done to develop a CFD model for analyzing the velocity and temperature distribution of HRSG systems with a single angle roof, a dual angle roof, and an air flow optimized evase. Particularly, attention was given to the critical areas of the HRSG, which include the evase, the first heat exchanger bundle, and upstream and downstream of the duct burner. On the basis of the all analyses, the air flow optimized evase was found to be very effective in establishing a uniform velocity distribution into the first heat exchanger bundles (superheater 3 and reheater 2) and in reducing the pressure drop through the whole HRSG system, which is of benefit to gas turbine operation.

Cycling Tolerance - Natural Circulation Vertical HRSGs


Combined cycle plants must supply electrical power to the grid as and when needed with consequent day/night and weekday/weekend cycling. Plants have to come on and off line with minimal notice and sometimes run at partial loads. European vertical HRSGs designed to permit the tubes to expand and contract freely and independently are able to minimize fatigue stresses related to cycling. This paper presents solutions to HRSG design issues for cycling tolerant operation. It relates to published data on problems observed with cycling horizontal HRSGs, and it describes how these problems can be overcome. Concepts, design features and calculation methods applied to cycling tolerant HRSGs are reviewed in detail.