Case study : heat recovery in a solid waste incineration plant
A French EPC company contracted Barriquand to design 2 heat exchangers for a cogeneration (or combined heat and power - CHP) plant within a solid waste incineration site near London.
Objective : reduce unavoidable energy waste.
Our client, specialized in renewable energy projects for a cleaner environment, was awarded an EPC contract to design and build a cogeneration (CHP) plant.
Cogeneration consists in generating useful heating and electricity from the same energy heat collector, here through the incineration of solid waste. Here the heat is driven into a boiler that itself feeds a turbine to generate electricity.
The purpose of the heat exchangers is to use the energy derived from the turbine’s exhaust vapor to heat up water for various applications: district heating, industrial sites, other processes such as the heating of greenhouses or the plant itself.
Barriquand’s expertise : a major asset.
Barriquand has many installs across heat recovery industrial processes and cogeneration plants.
We use the feedback from these installed units to systematically review and improve the design of our heat exchangers with a twofold approach:
1.to minimize the HTA (Heat Transfer Area) and the footprint of the unit and;
2.to offer competitive solutions.
Besides, we handle all the required documentation for such applications and all our products comply with the EN13445 norm.
A robust and flexible technology.
The operation of a combined heat and power plant requires a lot of flexibility. Indeed, those plants must be able to produce electricity and heat in line with a very fluctuating demand (every hour/day/week, etc..) and hardly any in the summer season. Therefore the design of these heat exchangers must take such considerable process variations into account.
At Barriquand, we designed 2 U-type shell & tubes heat exchangers: the main heater (7,250 kW) recovers the energy from the turbine to heat water and a steam condenser (150 kW) which recovers steam condensates for pre-heating purposes.
The U-type exchanger allows for free expansion of the tubes and hence strong resistance to thermal variations and constraints therefore making this design ideal for cyclical use.
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