Commission Implementing Decision of 26 September 2014 establishing the best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for the production of pulp, paper and board (notified under document C(2014) 6750) (Text with EEA relevance) (2014/687/EU) (c. 687)

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ANNEX U.K. BAT CONCLUSIONS FOR THE PRODUCTION OF PULP, PAPER AND BOARD

ACRONYMS U.K.

1.2. BAT CONCLUSIONS FOR KRAFT PULPING PROCESS U.K.

1.2.2. Emissions to air U.K.

1.2.2.1. Reduction of emissions in strong and weak odorous gases U.K.

BAT 20. In order to reduce odour emissions and total reduced sulphur emissions due to strong and weak odorous gases, BAT is to prevent diffuse emissions by capturing all process-based sulphur containing off-gases, including all vents with sulphur-containing emissions, by applying all of the techniques given below. U.K.

a The SOx emission levels of the lime kiln increase significantly when strong non-condensable gases (NCG) are fed to the kiln and no alkaline scrubber is used.
b Applicable for the treatment of weak odorous gases.
c Applicable for the treatment of strong odorous gases.
	Technique	Description
a	Collection systems for strong and weak odorous gases, comprising the following features: covers, suction hoods, ducts, and extraction system with sufficient capacity; continuous leak detection system; safety measures and equipment.
b	Incineration of strong and weak non-condensable gases	Incineration can be carried out using: recovery boiler lime kilna dedicated TRS burner equipped with wet scrubbers for SOx removal; or power boilerb To ensure the constant availability of incineration for odorous strong gases, back-up systems are installed. Lime kilns can serve as back-up for recovery boilers; further back-up equipment are flares and package boiler
c	Recording unavailability of the incineration system and any resulting emissionsc

Applicability U.K.

Generally applicable for new plants and for major refurbishments of existing plants. The installation of necessary equipment may be difficult for existing plants due to layout and space restrictions. The applicability of incineration might be limited for safety reasons, and in this case wet scrubbers could be used.

BAT-associated emission level of total reduced sulphur (TRS) in residual weak gases emitted is 0,05 – 0,2 kg S/ADt.

1.2.2.2. Reduction of emissions from a recovery boiler U.K.

SO₂ and TRS emissions U.K.

BAT 21. In order to reduce SO₂ and TRS emissions from a recovery boiler, BAT is to use a combination of the techniques given below. U.K.

	Technique	Description
a	Increasing the dry solids (DS) content of black liquor	The black liquor can be concentrated by an evaporation process before burning
b	Optimised firing	Firing conditions can be improved e.g. by good mixing of air and fuel, control of furnace load etc.
c	Wet scrubber	See Section 1.7.1.3

BAT-associated emission levels U.K.

See Table 3.

Table 3

BAT-associated emission levels for SO₂ and TRS emissions from a recovery boiler

a Increasing the DS content of the black liquor results in lower SO2 emissions and higher NOx emissions. Due to this, a recovery boiler with low emission levels for SO2, may be on the higher end of the range for NOx and vice versa.
b BAT-AELs do not cover periods during which the recovery boiler is run on a DS content much lower than the normal DS content due to shut down or maintenance of the black liquor concentration plant.
c If a recovery boiler were to burn black liquor with a DS > 83 %, then SO2 and gaseous S emission levels should be reconsidered on a case-by-case basis.
d The range is applicable without the incineration of odorous strong gases.
DS = dry solid content of the black liquor.
Parameter		Daily averagea bmg/Nm3 at 6 % O2	Yearly averageamg/Nm3 at 6 % O2	Yearly averageakg S/ADt
SO2	DS < 75 %	10 – 70	5 – 50	—
	DS 75 – 83 %c	10 – 50	5 – 25	—
Total reduced sulphur (TRS)		1 – 10d	1 – 5	—
Gaseous S (TRS-S + SO2-S)	DS < 75 %	—	—	0,03 – 0,17
	DS 75 – 83 %c			0,03 – 0,13

NO_x emissions U.K.

BAT 22. In order to reduce NO_x emissions from a recovery boiler, BAT is to use an optimised firing system including all of the features given below. U.K.

	Technique
a	Computerised combustion control
b	Good mixing of fuel and air
c	Staged air feed systems, e.g. by using different air registers and air inlet ports

Applicability U.K.

Technique (c)is applicable to new recovery boilers and in the case of a major refurbishment of recovery boilers, as this technique requires considerable changes to the air feed systems and the furnace.

BAT-associated emission levels U.K.

See Table 4.

Table 4

BAT-associated emission levels for NO_x emissions from a recovery boiler

a Increasing the DS content of the black liquor results in lower SO2 emissions and higher NOx emissions. Due to this, a recovery boiler with low emission levels for SO2, may be on the higher end of the range for NOx and vice versa.
b The actual NOx emission level of a recovery boiler depends on the DS content and the nitrogen content of the black liquor, and the amount and combination of NCG and other nitrogen containing flows (e.g. dissolving tank vent gas, methanol separated from the condensate, biosludge) burnt. The higher the DS content, the nitrogen content in the black liquor, and the amount of NCG and other nitrogen containing flows burnt, the closer the emissions will be to the upper end of the BAT-AEL range.
c If a recovery boiler were to burn black liquor with a DS > 83 %, then NOx emission levels should be reconsidered on a case-by-case basis.
DS = dry solid content of black liquor.
Parameter		Yearly averageamg/Nm3 at 6 % O2	Yearly averageakg NOx/ADt
NOx	Softwood	120 – 200b	DS < 75 %: 0,8 – 1,4 DS 75 – 83 %c: 1,0 – 1,6
	Hardwood	120 – 200b	DS < 75 %: 0,8 – 1,4 DS 75 – 83 %c: 1,0 – 1,7

Dust emissions U.K.

BAT 23. In order to reduce dust emissions from a recovery boiler, BAT is to use an electrostatic precipitator (ESP) or a combination of ESP and wet scrubber. U.K.

Description U.K.

SeeSection 1.7.1.1.

BAT-associated emission levels U.K.

See Table 5.

Table 5

BAT-associated emission levels for dust emissions from a recovery boiler

a For an existing recovery boiler equipped with an ESP approaching the end of its operational life, emission levels may increase over time up to 50 mg/Nm3 (corresponding to 0,4 kg/ADt).
Parameter	Dust abatement system	Yearly averagemg/Nm3 at 6 % O2	Yearly averagekg dust/ADt
Dust	New or major refurbishment	10 – 25	0,02 – 0,20
	Existing	10 – 40a	0,02 — 0,3a

1.2.2.3. Reduction of emissions from a lime kiln U.K.

SO₂ emissions U.K.

BAT 24. In order to reduce SO₂ emissions from a lime kiln, BAT is to apply one or a combination of the techniques given below. U.K.

	Technique	Description
a	Fuel selection/low sulphur fuel	See Section 1.7.1.3
b	Limit incineration of sulphur-containing odorous strong gases in the lime kiln
c	Control of Na2S content in lime mud feed
d	Alkaline scrubber

BAT-associated emission levels U.K.

See Table 6.

Table 6

BAT-associated emission levels for SO₂ and sulphur emissions from a lime kiln

a ‘strong gases’ includes methanol and turpentine
Parametera	Yearly averagemg SO2/Nm3 at 6 % O2	Yearly averagekg S/ADt
SO2 when strong gases are not burnt in the lime kiln	5 – 70	—
SO2 when strong gases are burnt in the lime kiln	55 – 120	—
Gaseous S (TRS-S + SO2-S) when strong gases are not burnt in the lime kiln	—	0,005 – 0,07
Gaseous S (TRS-S + SO2-S) when strong gases are burnt in the lime kiln	—	0,055 – 0,12

TRS emissions U.K.

BAT 25. In order to reduce TRS emissions from a lime kiln, BAT is to apply one or a combination of the techniques given below. U.K.

	Technique	Description
a	Control of the excess oxygen	See Section 1.7.1.3
b	Control of Na2S content in lime mud feed
c	Combination of ESP and alkaline scrubber	See Section 1.7.1.1

BAT-associated emission levels U.K.

See Table 7.

Table 7

BAT-associated emission levels for TRS emissions from a lime kiln

a For lime kilns burning strong gases (including methanol and turpentine), the upper end of the AEL range may be up to 40 mg/Nm3.
Parameter	Yearly averagemg S/Nm3 at 6 % O2
Total reduced sulphur (TRS)	< 1 – 10a

NO_x emissions U.K.

BAT 26. In order to reduce NO_x emissions from a lime kiln, BAT is to apply a combination of the techniques given below. U.K.

	Technique	Description
a	Optimised combustion and combustion control	See Section 1.7.1.2
b	Good mixing of fuel and air
c	Low-NOx burner
d	Fuel selection/low-N fuel

BAT-associated emission levels U.K.

See Table 8.

Table 8

BAT-associated emission levels for NO_x emissions from a lime kiln

a When using liquid fuels originating from vegetable matter (e.g. turpentine, methanol, tall-oil), including those obtained as by-products of the pulping process, emission levels up to 350 mg/Nm3 (corresponding to 0,35 kg NOx/ADt) may occur.
b When using gaseous fuels originating from vegetable matter (e.g. non-condensable gases), including those obtained as by-products of the pulping process, emission levels up to 450 mg/Nm3 (corresponding to 0,45 kg NOx/ADt) may occur.
Parameter		Yearly averagemg/Nm3 at 6 % O2	Yearly averagekg NOx/ADt
NOx	Liquid fuels	100 – 200a	0,1 – 0,2a
	Gaseous fuels	100 – 350b	0,1 – 0,3b

Dust emissions U.K.

BAT 27. In order to reduce dust emissions from a lime kiln, BAT is to use an electrostatic precipitator (ESP) or a combination of ESP and wet scrubber. U.K.

Description U.K.

See Section 1.7.1.1.

BAT-associated emission levels U.K.

See Table 9.

Table 9

BAT-associated emission levels for dust emissions from a lime kiln

a For an existing lime kiln equipped with an ESP approaching the end of its operational life, emission levels may increase over time up to 50 mg/Nm3 (corresponding to 0,05 kg/ADt).
Parameter	Dust abatement system	Yearly averagemg/Nm3 at 6 % O2	Yearly averagekg dust/ADt
Dust	New or major refurbishments	10 – 25	0,005 – 0,02
	Existing	10 – 30a	0,005 – 0,03a

1.2.2.4. Reduction of emissions from a burner for strong odorous gases (dedicated TRS burner) U.K.

BAT 28. In order to reduce SO₂ emissions from the incineration of strong odorous gases in a dedicated TRS burner, BAT is to use an alkaline SO₂ scrubber. U.K.

BAT-associated emission levels U.K.

See Table 10.

Table 10

BAT-associated emission levels for SO₂ and TRS emissions from the incineration of strong gases in a dedicated TRS burner

a This BAT-AEL is based on a gas flow in the range of 100-200 Nm3/ADt.
Parameter	Yearly averagemg/Nm3 at 9 % O2	Yearly averagekg S/ADt
SO2	20 – 120	—
TRS	1 – 5
Gaseous S (TRS-S + SO2-S)	—	0,002 – 0,05a

BAT 29. In order to reduce NO_x emissions from the incineration of strong odorous gases in a dedicated TRS burner, BAT is to use one or a combination of the techniques given below. U.K.

	Technique	Description	Applicability
a	Burner/firing optimisation	See Section 1.7.1.2	Generally applicable
b	Staged incineration	See Section 1.7.1.2	Generally applicable for new plants and for major refurbishments. For existing mills, applicable only if space allows for the insertion of equipment

BAT-associated emission levels U.K.

See Table 11.

Table 11

BAT-associated emission levels for NO_x emissions from the incineration of strong gases in a dedicated TRS burner

a Where at existing plants a switch to staged incineration is not feasible, emissions levels up to 1 000 mg/Nm3 (corresponding to 0,2 kg/ADt) may occur.
Parameter	Yearly averagemg/Nm3 at 9 % O2	Yearly averagekg NOx/ADt
NOx	50 – 400a	0,01 – 0,1a