Innovation in Global Power - Parsons Brinckerhoff

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http://www.pbworld.com/news_events/publications/network/ developments in circuit breaker and cable technologies. (#65, pp. 79-80) Design and Construction Considerations for Offshore Wind Turbine Foundations. Sanjeev Malhotra, New York. Larger wind turbines are being developed for off-shore wind farms, and their loads are creating new design and construction challenges for foundations. (#66, pp. 92-95) In Issue 59 on Sustainable Development, Nov 2004 http://www.pbworld.com/news_events/publications/network/issue_ 59/59_index1.asp The First Trigeneration System in a Beijing Commercial Building, Vincent Tse and Colin Chung, Hong Kong. A trigeneration system produces energy for electricity, heating and cooling very efficiently, becoming an attractive option for sustainable development projects encouraged by the Chinese Government. (#59, pp. 78-80) Independent Water and Power Projects: PB Invention to Improve Desalination. Paul Willson, Manchester. PB served on a technical team that demonstrated an independent water and power project plant that was much more efficient and sustainable and offered the lowest life cost. (#59, pp. 54-56) Using Minewater as a Heat Source. James Dickson and Dominic Bowers, London. For a new community to be built at a former coal-mining site, our analyses proved that the most sustainable option included the use of minewater as a heat source. (#59, pp. 61, 62) Sustainable Energy in the English Dales, Ian Burdon and Daniel Dufton, Newcastle. PB’s strategy for the regeneration of a dale taps into geothermal heat; brings power, heat, and economic strength to the region; and maximises benefits to the client, developers, and the community. (#59, pp. 63-65) In Issue 57 on Segmental Bridges, Feb 2004 http://www.pbworld.com/news_events/publications/network/issue_ 57/57_index.asp Advantages and Disadvantages of Long-Term Service Agreements for Independent Power Projects. Richard Whyte. Several considerations need to be evaluated if a long term service agreement for an IPP will meet the owner’s objectives. (#57, pp. 78-80) In Issue 56 on Australia/New Zealand, July 2003 http://www.pbworld.com/news_events/publications/network/ issue_56/56_Index.asp Criteria for Identifying Viable Wind Power Market Sites. Achim Hoehne. Selection of appropriate sites for wind farms is a key factor to the growth of wind power use. PB uses four criteria in helping clients identify sites that will be feasible, productive, practical and acceptable to the public. (#56, pp. 24-26) The Permitting of Toora Wind Farm. David Spink, Melbourne.The climatic conditions of certain Australian coastlines are ideal for wind farm development. PB had a role in the permitting of one of Victoria’s first wind farms. (#56, pp. 27-28) Steamfield Manager: Software for Resource Consent Reporting and Long-Term Steamfield Management. Errol Anderson and Aaron Hochwimmer, Auckland. PB Power designed Steamfield Manager software to manage the unique data environment of a geo-thermal power plant. (#56, pp. 29-31) Electrical Requirements of Geothermal Power Projects. Ivan Hunt. PB helped develop electrical design and engineering solutions to meet the unique requirements of new geothermal power stations. (#56, pp. 32-34) Tokelau Power Project. Christopher Lynch, Christchurch. Unique challenges, including non-technical ones, arise when designing a new power supply system in a remote area. (#56, pp. 35-36) Re-using Effluent to Supply the Millmerran Power Station. David Kent, Brisbane. We included unusual devices and protocols when designing a main to transport effluent from a sewage treatment plant to a new power station in order to prevent effluent from discharging accidentally. (#56, pp. 37-40) The Upgrading of an Existing Coal-fired Power Station. Mal Cotter (Brisbane), David Lesneski, Peter Reimann. In 2003, Australia derived 85 percent of its energy from coal. With increasing limitations on development of new coal facilities, however, refurbishing existing plants is becoming more important. (#56, pp. 41-43) Victoria’s Ageing Low-Pressure Gas Mains: Urgent Replacement or Not? Lane Crockett. Cast iron and unprotected steel gas mains are considered to be the main contributors to maintenance costs, leak rates and public safety risks. (#56, pp. 44-45) PB Takes Lead Role in Electricity Competition Reform. Anthony Seipolt. PB has taken an unusual role for a consultancy and is working with Australian regulatory bodies to enable the smooth implementation of competition amongst utility providers, which is a growing trend. (#56, p 46) Expenditure and Reliability Modelling. Brian Nuttall and Jacqui Bridge, Melbourne. In contrast to Seipolt’s article about the policy level, this article describes how we help utility companies adhere to regulations. Our models forecast network expenditure and reliability for the electricity, gas and water markets, and are applicable to pipeline, road, rail, and other networks. (#56, pp. 47-49) Lenders Engineer on Power Projects...Tales from the Vault. David Maslin. Based on experience working for financial institutions, Maslin discusses features of being a lenders’ engineer on power projects. (#56, pp. 50-51) John Chow has been the Executive Editor of PB Network since 1986. He has managed the Practice Area Networks since 1994. As part of the knowledge management team, John is the global content manager for Hub (PB’s SharePoint intranet), and has always fostered the sharing of knowledge at PB. PB Network #68 / August 2008 90
DEPARTMENTS PB’s power specialists provided R&D for the redesign of the main components of a dynamic composting system. This was a new area of work that resulted in lower energy consumption for our client and an expected longer life for its composting equipment. Figure 1: Corridors in an opentrench composting facility. Figure 2: Composting machine. PB Redesigns a Composting Machine for Improved Operations* By Oriol Altés, Barcelona, Spain, 34 93 5088520, altesO@pbworld.com Manufacturing organic compost is an effective way to recycle urban solid waste (USW) and other raw materials, such as sewage sludge and vegetable and forest residues. This can be done by using a dynamic composting system in either open trenches or closed tunnels. Open trench dynamic composting requires the construction of specific machinery. We are seeing many new developments and continuous improvements in such machinery. In fact, PB has worked closely with a client in Spain on the redesign of its operational units. Our research and development of new solutions and improvements have led to a revised design of the main systems of the composting machinery, including the mechanical, electromotor, hydraulic, control, and safety systems, and the redesign of civil works for the implementation of the machinery. Dynamic Composting Machinery Dynamic composting is based primarily on mixing USW or sewage sludge with other vegetable substances to obtain the correct initial properties for density, viscosity and humidity. The fermentation and maturing processes of this primary material take place in a group of trenches (Figure 1), which are corridors limited by concrete walls and a lower soleplate/ventilation system. The soleplate is a false floor made of perforated tiles that provide adequate ventilation to the material in the composting process. The trenches can be in a closed industrial warehouse or in an open one with a roof only, depending on the surrounding environmental needs, such as odor control and other considerations. The composting machine moves along the concrete walls on a rail system turning over the material with a cylindrical rotating drum with blades as it moves (Figure 2). It is propelled with electric motors for the translation movement and hydraulic power for the rotating drum. Composting operations are fully automated. The machines can be programmed to turn over material in all the trenches at the plant. An auxiliary transfer rack guides the machine into position over each trench. The turn over accelerates fermentation and the maturing process by contributing to the dissipation of excessive heat/temperature and restoring oxygen to the material. In addition, the ventilation system helps to maintain adequate levels of temperature and oxygen. The machine could also incorporate an on-board irrigation system. Gases emitted in the fermentation process are captured and sent to a treatment system (washing and filtration). 1 Leaching generated is reused to wet the organic material at the beginning of the process. *La edición en lengua española del presente artículo está disponible en la dirección Web de PB Network. 1 The topic of treating gases is covered in more detail in a preceding article, “Converting Landfill Gas to High-Btu Fuel” by Roger Lemos. This is also on the web at http://www.pbworld.com/ news_events/publications/network/ 91 PB Network #68 / August 2008
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Innovation in Global Power - Parsons Brinckerhoff

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