Power Demand Factor for Selective Catalytic Recovery

7/15/2010

Using an EPA report* on NOx control technologies for portland cement
manufacturing, annual power demand for SCR was calculated as follows.

Total energy costs ($/yr) for model precalciner kilns were divided by
the cost of electricity ($0.05/kwh) to estimate annual energy
consumption (kwh/yr). 

Kiln capacity was given as tons clinker/hr. The report stated that kilns
operated 8000 hr/yr. Using hourly clinker capacity and annual hours of
operation, total annual clinker production was calculated.

Total annual energy consumption (step 1) was divided by total annual
clinker production (step 2) to get kwh/ton clinker.

The steps are summarized in the table.

SCR Electricity Demand Factor, Precalciner Kilns

Energy Cost *

($/yr)	Electricity cost ($/kwh)*	Electricity use/yr 

(kwh/yr)	Kiln Capacity

(tons clinker/hr)*	Hrs of Operation (Hrs/yr)*	Annual clinker production
(tons clinker/yr)	Kwh/ton clinker

930000	0.05	18600000	100	8000	800000	23

1400000	0.05	28000000	150	8000	1200000	23

*US EPA, NOx Control Technologies for the Cement Industry, September 19,
2000, pp. 84, 87, 104.

	

