HONG KONG ADDS TO RENEWABLE ENERGY MIX WITH NEW BIOGAS SYSTEM

Hong Kong is the world’s most densely populated high-income urban area. It has a population of 7.2 million and a total area of 1,104 square kilometres, of which less than 25% is developed. Environmental sustainability and a healthy living environment have become top concerns for the local community and government in recent years.

 

The Challenge: Renewable Energy via Hong Kong’s Power Grid


Hong Kong’s Drainage Services Department (DSD) is a local pioneer in the use of renewable energy technologies. In addition to exploring solar power, it captures biogas at various sewerage treatment plants for use as a renewable fuel source.

 

Working with Jebsen Industrial, DSD has installed biogas-fuelled combined heat and power (CHP) generators at its Shek Wu Hui and Tai Po sewerage treatment plants. Both deployments use GE Jenbacher Type 3 CHP generators with power output of over 600 kW, installed in Shek Wu Hui in 2005 and in Tai Po in 2010.  In both cases, the electricity generated is used to power facilities within the sewerage treatment works while the recovered thermal energy is for pre-heating the recirculation water.

 

GE Jenbacher is one of the world’s leading manufacturers of gas-fuelled reciprocating engines, packaged generator sets, and cogeneration units. A unit of GE, which has produced innovative gas engines for more than 80 years, it introduced advanced gas engine technology to Greater China in partnership with Jebsen Industrial more than a decade ago.

 

With the Shek Wu Hui and Tai Po CHP generation systems operating well, DSD decided to deploy a new CHP generation system at its sewerage treatment works in Sha Tin. From the outset, DSD wanted to use the most efficient and reliable CHP technology available. As the project progressed, it became clear that the system would also need to connect to the electricity grid for energy generated at the Sha Tin treatment works available for use by Hong Kong households.

 

Sha Tin sewerage treatment plant with GE Jenbacher

 

The Solution: Support from Industry Experts


Experienced engineers from Jebsen Industrial worked closely with DSD and GE Jenbacher throughout the Sha Tin project, providing technical consultation and installation, commissioning and testing services.

 

“Jebsen Industrial is proud to support Hong Kong Government efforts to promote the wider use of renewable energy and energy-efficient technologies. We have been involved in many successful installations in the region, with DSD and other partners, and have the experience and expertise to take renewable energy projects from design and budgeting, through to deployment and maintenance,” Ms. Rachel Cheung, Jebsen Industrial General Manager of Automation & Services, explained.

 

“The DSD Sha Tin project uses a CHP generator with a GE Jenbacher gas engine to generate renewable energy using biogas produced from the sewerage treatment process. This not only offers substantial cost savings for the Department, but also contributes to a reduction in greenhouse gas emissions for Hong Kong,” she continued.

 

Advanced Gas Engine Technology


The GE Jenbacher Gas Engine Type 4 selected for the Sha Tin project provides a power output ranging from 800 to 1,500 kW. It delivers high power density, with optimized control and monitoring providing easy preventive maintenance and maximum reliability and availability.

 

Besides setting a new standard for energy efficiency, the Type 4 Jenbacher minimizes emissions of nitrogen oxides (NOx), which was a requirement of DSD. All GE’s Jenbacher V-engines use the LEANOX® lean burn control system to ensure the correct air/fuel ratio and minimise exhaust gas emissions while delivering stable operations under all conditions. In biogas-fuelled systems this helps guarantee low NOx emissions without the need for an exhaust catalyst.

 

The Type 4 CHP system has NOx emissions of less than 250mg/m3, which is considered very low. Combining low NOx with high efficiency, the Jenbacher Type 4 gas engines represent an optimal green solution in the gas engine field.

 

GE Jenbacher Type 4 

 

Expert Support Delivers Major Benefits


After the system had been commissioned, DSD requested that the CHP generator be connected to the public electricity network to enable excess energy to be available to households in Hong Kong. With engineering expertise and long-term relationships with both DSD and GE Jenbacher, Jebsen Industrial was pivotal in solving the resultant technical complications and ensuring the grid connection was achieved smoothly.

 

The GE Jenbacher Gas Engine Type 4 CHP generator was deployed at Sha Tin sewerage treatment works at the end 2013. It has the highest rate of power generation of any CHP generator of its type in Hong Kong.  In its first 6 months of operation, it produced more than 3 million kWh of energy, which would be enough power to run more than 1,000 household air-conditioners of 1.5 horsepower in the same timeframe. This saved about 2,300 tons of carbon dioxide emissions and will contribute to annual energy cost savings of HK million*.

 

“As a modern city, Hong Kong places great importance on having a healthy environment, where waste management, environmental protection and energy saving are all prioritized. This project is having a very positive impact and we are pleased to report that we are now involved in more renewable energy projects in Hong Kong and Macau,” Mr. von Stillfried said.

 

Client

 

  • The Hong Kong Drainage Services Department (DSD), which manages the public sewerage network to contribute to the sustainable development of Hong Kong

 

Partner

 

  •  GE Jenbacher, world leading manufacturer of gas engines and a Jebsen Industrial partner for more than 15 years

 

Challenge

 

  • Deploy highly efficient, high yield, low NOx biogas-fuelled CHP generator at Sha Tin sewerage treatment plant
  • Connect the system to the public electricity grid

 

Value-added solution

 

  • GE Jenbacher Gas Engine Type 4 (J412 GS), the most efficient CHP generator in the 800-1,500 kW power range
  • Technical consultancy and installation, commissioning and testing services from Jebsen Industrial
  • In the first 6 months, more than 3 million kWh of energy produced, saving 2,300 tons of CO2 emissions
  • Annual energy cost savings of HK7 million*

 

For More Information

For more information about Jebsen Industrial’s capabilities in renewable energy and energy efficient installations, and how it can help organisations save energy and money, please send an email to [email protected] or visit the website at: www.jebsenindustrial.com


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