Division BAT 46 In order to increase the energy efficiency of the combustion of iron and steel process gases, BAT is to use an appropriate combination of the techniques given in BAT 12 and below.

United Kingdom

Technique		Description	Applicability
a.	Process gas management system	See description in Section 8.2	Only applicable to integrated steelworks

Table 27

BAT-associated energy efficiency levels (BAT-AEELs) for the combustion of iron and steel process gases in boilers

Type of combustion unit	BAT-AEELs^f1 ^f2
These BAT-AEELs do not apply in the case of units operated < 1 500 h/yr.
In the case of CHP units, only one of the two BAT-AEELs ‘Net electrical efficiency’ or ‘Net total fuel utilisation’ applies, depending on the CHP unit design (i.e. either more oriented towards electricity generation or towards heat generation).
These BAT-AEELs do not apply to plants generating only electricity.
The wide range of energy efficiencies in CHP units is largely dependent on the local demand for electricity and heat.
Type of combustion unit	Net electrical efficiency (%)	Net total fuel utilisation (%)^f3
Existing multi-fuel firing gas boiler	30–40	50–84
New multi-fuel firing gas boiler^f4	36–42,5	50–84

Table 28

BAT-associated energy efficiency levels (BAT-AEELs) for the combustion of iron and steel process gases in CCGTs

Type of combustion unit	BAT-AEELs^f5 ^f6
These BAT-AEELs do not apply in the case of units operated < 1 500 h/yr.
In the case of CHP units, only one of the two BAT-AEELs ‘Net electrical efficiency’ or ‘Net total fuel utilisation’ applies, depending on the CHP unit design (i.e. either more oriented towards electricity generation or towards heat generation).
These BAT-AEELs do not apply to plants generating only electricity.
	Net electrical efficiency (%)		Net total fuel utilisation (%)^f7
	New unit	Existing unit	Net total fuel utilisation (%)^f7
CHP CCGT	> 47	40–48	60–82
CCGT	> 47	40–48	No BAT-AEEL

Annotations

f1: These BAT-AEELs do not apply in the case of units operated < 1 500 h/yr.
f2: In the case of CHP units, only one of the two BAT-AEELs ‘Net electrical efficiency’ or ‘Net total fuel utilisation’ applies, depending on the CHP unit design (i.e. either more oriented towards electricity generation or towards heat generation).
f3: These BAT-AEELs do not apply to plants generating only electricity.
f4: The wide range of energy efficiencies in CHP units is largely dependent on the local demand for electricity and heat.
f5: These BAT-AEELs do not apply in the case of units operated < 1 500 h/yr.
f6: In the case of CHP units, only one of the two BAT-AEELs ‘Net electrical efficiency’ or ‘Net total fuel utilisation’ applies, depending on the CHP unit design (i.e. either more oriented towards electricity generation or towards heat generation).
f7: These BAT-AEELs do not apply to plants generating only electricity.