Co-Generation Plant in Thailand

Co Gen Plant (Picture Courtesy of Euroasiatic (Thailand) Co.,Ltd)

We were awarded a contract to install all piping works involved with a Co Generation Plant at a factory as the Main Piping Contractor. Our main client is Euroasiatic (Thailand) Co.,Ltd and work also includes other area like installing platforms, supplying chimney stack and welding between the furnace and the boiler.

But first of all, what is a Co Gen Plant?

Co Gen Plant in the olden days are usually used at dams for generating huge amount of electricity by means of water. Here, the main source is using highly compressed Natural Gas from 8 bar to 25 Bar. (Located at the Right End Furthest)

Gas Turbine (Picture Courtesy of Euroasiatic (Thailand) Co.,Ltd)

The compressed gas is fired to the Gas Turbine which in turns generates 7.5MW of electricity, ie 7500kW.

Gas Compressor Room

A Gas turbine generating 7.5MW of electricity.

Hot gas exits the Gas Turbine at 500 Deg C and these hot gas is then used to heat up water to produce steam at a rate of 25tons per hour. The high chimney stack at the middle is used to bypass the hot gas if the customer wants to discharge the hot gas instead.

Boiler 50ton for Co Gen Plant

The boiler and furnace comes in a single unit and is rated at 50 ton/hour. Hence 50% of the steam is generated courtesy of the hot gas generated from the Gas Turbine.

If the customer requires another 25ton of steam additional, he can fire up the burner on the boiler and they will have additional steam supply. This is another advantage of the Co Gen System.

Back to the Hot Air Gas Turbine. As it is still hot after passing through the boiler, it is then passed through a series bank of tubes called economizer (At the Left End most with a Vertical chimney Pointing upwards)

Co Gen Plant

The hot gas heats up cold water coming in from the absorption chiller and heats up the water and send it back to the absorption chiller. Finally the hot gas exits the environment at the top of the chimney.

Meanwhile, the piping carries the hot water back to the absorption chiller to generate cold water on the other side of the absorption chiller. The cold water then distributes cooling water to the cooling tower, to the Gas Turbine, to the Gas Compressor without using electricity, courtesy again from the hot gas.

Co Generation Plant - An Absorption Chiller

Cogeneration Plant - Cooling Tower

Steam generated from the furnace also goes through a heat exchanger for recirculation system. Boiler feedwater from Feedpump is supplied to the furnace for the input of water to become steam.

Co Generation Plant Feedwater Pump

In addition to this, compressed air is also required for the Co Gen system. Picture below shows compressed air tanks fabricated and tested under Extreme Vision Engineering Scope of work.

Co Gen Plant - Compressed Air Tank

All these pipings are supplied and installed under Extreme Vision Engineering Scope of work and details can be seen at a later post.

Co Generation Plant _ Piping works

Co Generation Works _ Piping

You may also be interested to look at:-

a) Machineries Installation of CoGen Plant