Chimney Height Calculation PDF

 

  Breckland Crematorium - Chimney Height Calculation

Breckland Crematorium Norwich Road Scoulton Norfolk NR9 4NR

Chimney Height Calculation Supporting information document February 2019

ehrc

Environmental Health Resource Centre Limited, 41 Elsiedene Road, London N21 2RN

eMail: [email protected]

iPhone: 07802 349 581

eFax: 0871 66 11 321

 

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Contents: 1.0

Introduction

3 

2.0

Input data

4

2.1

Cremation equipment

4

2.2

Emissions data

5

2.3

Local environmental data

7

2.4

Building information

8

3.0

Chimney height

8

Resources Appendices Appendix 1: Air quality maps Appendix 2: Site plan Appendix 2: Chimney height calculations

ehrc Breckland Crematorium - Chimney Height Calculation

 

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1.0

Introduction

ehrc  were engaged to undertake a chimney height calculation for the proposed Breckland Crematorium. Breckland Crematorium will be a new crematorium housing two FTIII cremators. Exhaust gasses will pass though one abatement plant and process chimney. The purpose of this report is to determine the chimney height for the proposed installation. The methodology used in to calculate chimney height this assessment is the HMIP Technical Guidance Note D1 “Guidelines on Discharge Stack Heights for Polluting Emissions”, which takes into account a number of factors, including:    

 

     

Stack diameter Emission release rates at reference conditions Emissions volume flow and efflux e fflux velocity and temperature at stack conditions The effect of nearby buildings Local background air quality data Guideline concentrations for protecting the environment

The D1 assessment is widely accepted by Regulators for the calculation of chimney heights for Crematoria. Surrogate data from other crematoria operating identical equipment will be used in this assessment because the proposed installation is not yet operational.

ehrc Breckland Crematorium - Chimney Height Calculation

 

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2.0

Input data

2.1

Cremation equipment

Perth Crematorium opening in 2018 and operates two FTIII cremators via single abatement plant is likely to be the influencing factor on emissions. The following data was obtained from the commissioning test report undertaken in June 2018 Perth Crematorium average of all runs: Parameter

Units

Stack inside diameter (all)

0.35

m

Exhaust gas flow rate (actual)

4514

m /hr

Exhaust gas flow rate (reference)

1799

m /hr

144 (417)

°C (°K)

Emission temperature Efflux velocity

8.6

3

3

m/s

Perth Crematorium Run H1: Parameter

Units 3

Exhaust gas flow rate (actual)

4514

m /hr

Exhaust gas flow rate (reference)

1799

m /hr

144 (417) 8.6

°C (°K) m/s

Emission temperature Efflux velocity

3

Perth Crematorium Run H2: Parameter

Units 3

Exhaust gas flow rate (actual)

4514

m /hr

Exhaust gas flow rate (reference)

1799

m /hr

144 (417)

°C (°K)

Emission temperature Efflux velocity

8.6

3

m/s

Perth Crematorium Run Hg1: Parameter

Units

Exhaust gas flow rate (actual) Exhaust gas flow rate (reference) Emission temperature Efflux velocity

3

4514

m /hr

1799 144 (417)

m3/hr °C (°K)

8.6

m/s

Perth Crematorium Run Hg2: Parameter

Units 3

Exhaust gas flow rate (actual)

4514

m /hr

Exhaust gas flow rate (reference)

1799

m /hr

144 (417) 8.6

°C (°K) m/s

Emission temperature Efflux velocity

ehrc Breckland Crematorium - Chimney Height Calculation

3

 

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Perth Crematorium Run D&F: Parameter

Units 3

Exhaust gas flow rate (actual)

4514

m /hr

Exhaust gas flow rate (reference)

1799

m /hr

144 (417)

°C (°K)

Emission temperature Efflux velocity

8.6

3

m/s

The full emissions test report used in this assessment is available as Appendix 2  to the permit application.

2.2

Emissions data

Crematoria are regulated under Environmental Permits, which require specific emission limits to be met. The emission limits for England, Scotland and Wales are well established in Process Guidance Note PG5/2(12) September 2012 as Best Available Techniques Emission Limits. Used in conjunction with the exhaust gas flow at reference conditions from the each Crematorium report, the maximum allowable emission rates in g/sec from the proposed crematorium can be calculated as follows: (Gas flowREF x 3600) x Emission Limit / 1000 = Emission ra rate te g/sec As can be seen from the emissions report, actual emissions from crematoria are much lower (better) than the permitted emission limits, but worst case emission limits are used in this assessment. Emission rates from the proposed chimney as used in the D1 assessment are as follows: Perth Crematorium average of all runs: Emission limit 3 (mg/m )

Exhaust gas flow rate (reference) 3 Nm /sec

Max mass emission rate (g/sec)

Particulate Matter

20.00

0.73

0.014692

Hydrogen Chloride Mercury

30.00 0.05

0.73 0.73

0.022038 0.000037

VOC

20.00

0.73

0.014692

Carbon Monoxide

100.00

0.73

0.073461

Emission limit 3 (mg/m )

Exhaust gas flow rate (reference) 3 Nm /sec

Max mass emission rate (g/sec)

Particulate Matter

20.00

0.76

0.015256

Hydrogen Chloride Mercury

30.00 0.05

0.76 0.76

0.022883 0.000038

VOC Carbon Monoxide

20.00 100.00

0.76 0.76

0.015256 0.076278

Parameter

Perth Crematorium Run H1:

Parameter

ehrc Breckland Crematorium - Chimney Height Calculation

 

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Perth Crematorium Run H2: Emission limit 3 (mg/m )

Exhaust gas flow rate (reference) 3 Nm /sec

Max mass emission rate (g/sec)

Particulate Matter

20.00

0.72

0.014372

Hydrogen Chloride Mercury

30.00 0.05

0.72 0.72

0.021558 0.000036

VOC

20.00

0.72

0.014372

Carbon Monoxide

100.00

0.72

0.071861

Emission limit 3 (mg/m )

Exhaust gas flow rate (reference) 3 Nm /sec

Max mass emission rate (g/sec)

Particulate Matter

20.00

0.60

0.012039

Hydrogen Chloride

30.00

0.60

0.018058

Mercury

0.05

0.60

0.000030

VOC

20.00

0.60

0.012039

Carbon Monoxide

100.00

0.60

0.060194

Emission limit 3 (mg/m )

Exhaust gas flow rate (reference) 3 Nm /sec

Max mass emission rate (g/sec)

Particulate Matter

20.00

0.83

0.016656

Hydrogen Chloride

30.00

0.83

0.024983

Mercury VOC

0.05 20.00

0.83 0.83

0.000042 0.016656

Carbon Monoxide

100.00

0.83

0.083278

Emission limit 3 (mg/m )

Exhaust gas flow rate (reference) 3 Nm /sec

Max mass emission rate (g/sec)

Particulate Matter Hydrogen Chloride

20.00 30.00

0.76 0.76

0.015139 0.022708

Mercury VOC

0.05 20.00

0.76 0.76

0.000038 0.015139

Carbon Monoxide

100.00

0.76

0.075694

Parameter

Perth Crematorium Run Hg1:

Parameter

Perth Crematorium Run Hg2:

Parameter

Perth Crematorium Run D&F: Parameter

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2.3

Local environmental data

In addition to emissions and technical data, the D1 model uses Guideline concentration (Gd) data and Background concentration (Bc) data in the determination of chimney height. It is noted that Gd and Bc data in the D1 Document are out of date, and this section confirms that original D1 data has not been used in this assessment. For Gd, current in the D1the model is asstatutory follows: short-term Air Quality objectives have been used, and Gd data used Guideline Concentrations:

3

mg/m  

Notes 3

Particulate Matter

0.05

50µg/m  Air Quality objective (.gov.uk)

Hydrogen Chloride

0.750

750µg/m  Hourly limit (.gov.uk)

Mercury

0.0075

7.5µg/m  Hourly limit (.gov.uk)

VOC

0.195

195µg/m  Hourly limit as Benzene (.gov.uk)

Carbon Monoxide

10.0

10mg/m  Air Quality objective (.gov.uk)

3

3

3

3

For Background concentration (Bc), data was derived as follows: defra UK ambient air quality map for background air quality (where background data has been modelled for each UK kilometre grid square into a range of pollution concentrations) which is the resource generally used for D1 calculation, and   Air Pollution in the UK 2015, (defra)  

Bc data used in the D1 model is as follows: Background Concentrations: Particulate Matter Hydrogen Chloride

3

mg/m   0.017 0.00

Notes 3

13-17µg/m  – UK Ambient Air Quality Interactive Map. Assumed zero. 3

Mercury

0.000003

3ng/m  - Air Pollution in the UK 2015.

VOC (as if benzene)

0.00005