NATURAL GAS TO STEAM TO POWER PLANT IN JAPAN

NATURAL GAS DRIVEN & POWER TO BURN – CLEAN POWER – JAPANp36552Halfway between the centre of Tokyo and Narita Airport is Makuhari New
City, the centre of Japan’s latest and boldest trigeneration experiment.
The city’s Makuhari District Heating and Cooling Centre (MDHCC) owned and operated by EnergyAdvance iscontributing positively to the city which is energy-rich and environmentally-friendly.
Heat for the district heating and district cooling system is supplied to the 61.6 hectares of the international businessarea of the city.

Two years ago the MDHCC brought in anew high-efficiency gas engine tri-generation plant .

The results have beensignificant in the high energy savings and
reduction of CO2 emissions.
Since the installation of the new system, MDHCC has raised COP by 0.5 points and has achieved a 24% reduction of fuel
consumption and cut CO2 emissions by 24,000t/a.
This saving of energy and reduction of CO2 emissions results from the best mix of optimum layout and design of highefficiency equipment such as gas engines which generate power using clean natural gas as fuel and optimum operational technology.
Two high-efficiency Wärtsilä engines with a power generation efficiency of
45.6% have been introduced for the firsttime into Japan. Electrical power
produced by the gas engines runs theelectric turbochiller to produce chilled water. The surplus electrical power isused to power the plant and is also sold to generate cost benefits.
The Wärtsilä gas engines not only produce high levels of efficiency but they also provide low costs of operation as natural gas costs less than fuel oil and the consumption of lubricating oil is at a minimum level.
A heat recovery system uses the gas engine’s waste heat to produce steam to power the engine’s waste heat boilers toproduce large amounts of steam which drives absorption chillers that produce chilled water. Additionally, no steam is Steam operations in Japan

Clever utilisation of steam is at the heart of the Makuhari District Heating and Cooling Centre located just outside Tokyo. Many consider it the perfect model of trigeneration.Wasted as it is actively used as a heat
source in all kinds of situations at theoperator’s facilities.
The beneficial aspectsSteam created by the furnace flue boiler becomes the heat source for customer’s heating and is also used as a heat source
for the steam absorption chiller.

Water tube boiler is operated primarilyto drive the steam turbine turbo chiller.
Heat generated during cooling of the gas engine is sent to the hot water absorption chiller to be used as a heat source for the air conditioning.
In addition, high temperature heat generated by the gas engine is used to
create steam at the heat recovery boiler,which is used as the heat source to produce chilled water for air conditioning at the steam absorption chiller.
The cooling towers are installed on the upper portion of the pyramid and serve to radiate heat generated to the chillers.
The district heating and chilling pipelines are installed in purpose-built culverts which run throughout the city
The tri-generation power plant contributes to the local environment by
significantly reducing CO2 emissions and preventing air pollution by reducing both NOx and SOx emissions.
The heating and cooling of buildings is, in many cases, installed by independent air conditioning systems. The buildings must each provide everything from installation of various heating and cooling sources to management, operation and maintenance.
On the other hand, district heating and cooling generates ‘heat’ such as chilled water and steam collectively at a single energy plant.
This is a centralised system that supplies this through pipes to multiple buildings located within a fixed area. By entrusting such matters to energy professionals, customers are able to use ‘heat’ that is safe,secure and environmentally-friendly.
A spokesman for the MDHCC told IPA:
“The concept of tri-generation is now a proven, cost effective alternative for a continuous supply of electricity, heatingand cooling needed all year round.”
www.wartsila.com
Internet link
IPA

Sourced and published by Henry Sapiecha 16th July 2009

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