Disposal of waste sorbent Calcium looping

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1 disposal of waste sorbent

1.1 properties of waste sorbent
1.2 disposal routes

1.2.1 use in cement manufacture







disposal of waste sorbent
properties of waste sorbent

after cycling several times , being removed calcium loop, waste sorbent have attrited, sulfated , become mixed ash fuel used. amount of ash in waste sorbent depend on fraction of sorbent being removed , ash , calorific content of fuel. size fraction of sorbent dependent on original size fraction number of cycles used , type of limestone used.


disposal routes

proposed disposal routes of waste sorbent include:



landfill;
disposal @ sea;
use in cement manufacture;
use in flue gas desulfurisation (fgd).

the lifecycle co2 emissions power generation cal , first 3 disposal techniques have been calculated. before disposal of cao coal power cal has similar level of lifecycle emissions amine scrubbing co2-absorbing properties of cao cal becomes less polluting. ocean disposal found best, current laws relating dumping waste @ sea prevent this. next best use in cement manufacture, reducing emissions on unabated coal plant 93%.


use in cement manufacture

portland cement approximately two-thirds calcium oxide mass , manufacture responsible approximately 8% of world s co2 emissions. 60% of co2 comes calcination of calcium carbonate shown earlier in article, , other 40% fossil fuel combustion. replacing or of calcium carbonate entering plant waste calcium oxide, co2 caused calcination can avoided, of co2 fossil fuel combustion.


this calcium oxide sourced other point sources of co2 such power stations, effort has been focussed on integrating calcium looping portland cement manufacture. replacing calciner in cement plant calcium looping plant, should possible capture 90% or more of co2 relatively inexpensively. there alternative set-ups such placing calcium looping plant in preheater section make plant efficient possible.


some work has been undertaken whether calcium looping affects quality of portland cement produced, results far seem suggest production of strength-giving phases such alite similar calcium looped , non-calcium looped cement.








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