Details of Belfast Plume Plotter

This page should be read in conjunction with How Plume Plotter Works. It provides more details specific to the Belfast version of Plume Plotter.

Stacks and buildings

Building measurements are taken from [1]. This image shows the layout of the stack and building modelled. North is at the top; colours and numbers indicate the height of the buildings and the stack.

Stack measurements

These are taken from [1]:

Stack location: 54.619559,-5.8805033.
Stack height: 51 m.
Stack diameter: 1.73 m.
Stack gas exit velocity: 23.1 m/s.
Stack gas temperature: 155 °C.

The following values are used for site characteristics. Roughness length is as specified in [1]:

Albedo: 0.2.
Bowen ratio: 1.
Roughness length: 0.3.

Emissions

The emission rates of pollutants are taken from [1]:

Pollutant	Emission rate per second
Oxides of nitrogen	6.783 g
Particulates	399 mg
Sulphur dioxide	1.995 g
Carbon monoxide	1.995 g
TOC	399 mg
Hydrogen chloride	399 mg
Hydrogen flouride	39.9 mg
Cadmium & Thallium	2.1 mg
Mercury	2.1 mg
Other metals	21 mg
Ammonia	201 mg
Dioxins and furans	3.99 ng

Background levels

The background levels of pollutants are taken from [1]:

Pollutant	Background concentration per m³
Oxides of nitrogen	16 μg
Particulates	21 μg
Sulphur dioxide	N/A
Carbon monoxide	N/A
TOC	N/A
Hydrogen chloride	N/A
Hydrogen flouride	N/A
Cadmium & Thallium	80 pg
Mercury	1.59 ng
Other metals	30.93 ng
Ammonia	N/A
Dioxins and furans	N/A

Weather data

Weather data is taken from METAR reports from a local airport: Belfast City.

Upper air data is the latest reported by the Castor Bay upper air station.

References

1. Combined Heat and Power Generating Station for the Treatment of RDF by Gasification -- Environmental Statement -- Air Quality Impact Assessment. The Airshed. March 2015. Planning application LA04/2015/0301/F.