In May 2007, Wärtsilä was awarded a contract from JB Enertek Co., Ltd., South Korea,
to deliver engineering and equipment (EEQ) in
two phases for a 25.3 MWe combined heat and
power plant (CHP).
The plant is located in Cheong Soo community in Cheon Ahn City, approximately 100 kilometres south of Seoul, Korea. The purpose of the Cheong Soo trigeneration plant is to provide district heating and electricity to a suburban area covering approximately three-square kilometres with about 6400 households and public buildings. The first phase of the project comprised two Wärtsilä 20V34SG natural gas-fuelled generating sets equipped with a heat recovery system for district heating purposes. Phase 1 was commissioned and handed over in February 2010. The second phase consisted of an identical genset to the previous, and it was completed in 2015. The three gensets generate electricity in parallel with the electrical grid and supply district heating to the town network.
The plant also provides district heating water and power. In accordance with South Korea’s energy policy, selling only electrical power to the grid is not feasible. At night, the electrical load in the suburban area is so low that the amount of heat generated by the engines at this time is significantly reduced compared to daytime. Unfortunately, the amount of heat needed by households during this period of time in the 24-hour cycle is at its maximum. This is why installing a heat accumulator comes into question: it allows the Cheong Soo plant – operating essentially in island mode – to run continuously on high load and thus, at high levels of total efficiency (more than 85% in this case). The additional heat generated during daytime is partly stored in the accumulator for use during the following night.
This was the first CHP project delivered by
Wärtsilä in South Korea under the CES (Community Energy System) concept which is based on South Korean legislation to encourage decentralized energy production. The objective of
the CES concept is to supply electricity and heat
from independent power production facilities to commercial, residential, business and hospital
buildings in specific areas.
The total electrical output of the plant is 25 MWe and thermal output 21 MWth. Total efficiency is 79% including 34% for power and 45% for district heat water. Wärtsilä designs, procures and delivers the equipment as well as provides technical advisory services at site during the installation and commissioning works. The erection and installation of the equipment is carried out by JB Enertek and local contractors.
