Effects of air pollution – A variety of air pollutants have known or suspected harmful effects on human health and the environment. In most areas of Europe, the effects of air pollution from these pollutants are principally the products of combustion from space heating, power generation or from motor vehicle traffic. Pollutants from these sources may not only prove a problem in the immediate vicinity of these sources but can travel long distances.
Particulate Matter, better or more commonly known as PM2.5 and PM10, is one of the main pollutants.
Fine particles can be carried deep into the lungs where they can cause inflammation and a worsening of heart and lung diseases.
Add Nitrogen Dioxide, Sulphur Dioxide, Ozone to the mix and these gases irritate the airways of the lungs, increasing the symptoms of those suffering from lung diseases.
Air pollution is believed to cause 36,000 deaths each year in the UK, and some estimates place the economic cost at £20bn annually. According to NHS England, 5% of all deaths of those aged over 30 are attributable to fine particulate matter (PM2.5) alone. Despite this, the UK’s current legal objective for PM2.5 allows for air twice as polluted as the World Health Organisation UK recommended level.
Source – Air Quality News
Filtering the hot gases reduces the impact of emissions.
How the filter works?
The hot gas Alkaline Earth Silicate filter element effectively blocks particulates and micro-dust particles. The AES element is tubular in shape, the bottom is sealed to create an inner clean gas cavity and the outer dust surface is smooth. There are up to six hundred AES elements in the filter housing, they are secured in the vertical position above the fly – ash hopper. The dry flue gas enters the housing and is distributed evenly between the AES filter elements. The dust and particulate matter remains on the outside of the AES filter element and forms a dry cake around the element, the dry flue gas is drawn by the negative pressure which has been created by the draft fan, drawing filtered gas through the filter walls and up into the top of the filter housing.
Where the gas goes!
The filtered gas now flows out of the filter and up through the chimney. Particulates and fly-ash dust continues to deposit, building the cake further on the outer wall of the AES filter element. Once the dust builds up to a set level, the differential pressure switch (measured by the filter controller) signals to activate the high pressure, air jet cleaning system. This allows for the reverse air flow through the filter to remove caking dust from the outer surface of the filter and in turn deposits the dust into the fly-ash hopper. The fly-ash passes through an airtight, rotary cell lock valve, which eliminates any ineligible combustion while transferring the ash into an optional wet ash conveyor or auger screw for disposal in a portable bin or skip.
We clean the air you breathe! filtering the air one boiler at a time!