Primærluft i CHP.pdf

Abstract
This thesis is made as the final part of my education as Bachelor of Marine and Technical Engineering. In
extension of my internship at a waste fired CHP (combined Heat and Power plant). The plant is situated
in Aalborg a city in Northern Jutland of Denmark.
The primary fuel is household waste alongside with industrial waste, from a wide variety of firms. The
Company Reno-Nord I/S that runs the plant is also responsible for a Landfill where storages of
contaminated waste is carried out as they are responsible for the burning of dangerous waste.
Reno-Nord I/S is organized as a partnership with a politically appointed board. The partner
municipalities are Brønderslev, Jammerbugt, Mariagerfjord, Rebild and Aalborg municipalities.
The energy that comes from burning the waste is exploited for two purposes. Namely Production of
Electricity and District heating. The Electricity is sold on the free marked and the heat is transferred and
sold to Aalborg district heating Company.
The process of making this to products is when the waste I burned in the Plant, the heat from the fire
produces steam. The steam then drives a Turbine, this drives a Generator that produces electricity.
Upon this the steam partially condensates, bough the rest steam and the condensate is heat exchanged
for the district heating.
During the Internship it became clear that the primary air supply for the Furnace did not have the right
temperature. It should have a temperature of 145° C but at the time of my intership it had fallen to
around 105° C. I went about the problem in a deductive manner. What could be the reason for this
temperature drop? Can the problem be rectified or optimized?
This thesis analyses on the above mentioned problem. And some models for rectifying and optimizing
around this problem are set forward. Also the way the primary air flow is heated is rethought specially
the drying of the waste on the first grate in the furnace. For this I set a theory that might deliver a
further NOX reduction.
It is then concluded that the most sensible method of rectifying the problem.
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