MAKE UP
As Steam is used water is added to the system -
this is known as make-up water, when the Next button is
pressed then the Make Up tank appears.
As the simulation is run the program calculates the amount of make-up added and
the effect this has on the
balance of the boiler, the TDS affects the feed water TDS and so in turn this
affects the amount of water blown out
of the boiler and hence the economies of operation.
The alkalinity level has an effect on the quantity of condensate treatment used,
the natural alkalinity breaks down
in the boiler to form carbon dioxide which goes off with the steam, when the
steam condenses it mixes with the
carbon dioxide and forms hot carbonic acid which attacks the condensate pipework,
the first places this is
noticed is at stress points such as screw threads.
Reducing the alkalinity in the make-up reduces chemical consumption.
Hardness enters the system through the make up
water, the hardness deposits on the boiler surfaces as scale,
the hardness control chemical converts the scale to small non-adherent particles
which settle in the bottom of the
boiler and are removed by regular bottom blowdown.