How do you find the composition of a flue gas?
Total amount of dry flue gas per 1 kg wood = 4.872 m3. Therefore % CO2 = 0.97/4.872 = 19.91 assuming stoichiometric combustion (0 % O2). For 20 % excess air = 16.6 % CO2 For 40 % excess air = 14.2 % CO2 For 50 % excess air = 13.27.
What is the composition of flue gas and what is the ideal CO2 content of flue gas?
A typical post-combustion flue gas contains 4-15% CO 2, depending on the fuel used, along with a large amount of nitrogen and water vapour [17] [18] [19].
Is flue gas heavier than air?
Natural gas is lighter than air and rapidly dissipates into the air when it is released. Propane gas is similar to natural gas in many ways and is also used as a fuel. The most significant difference between propane and natural gas is that propane gas is HEAVIER than air.
What is flue gas example?
Flue gases are a mixture of combustion products and include water vapour, carbon dioxide, particulates, heavy metals and acidic gases.
What do you mean by flue gas?
Flue gas (sometimes called exhaust gas or stack gas) is the gas that emanates from combustion plants and which contains the reaction products of fuel and combustion air and residual substances such as particulate matter (dust), sulfur oxides, nitrogen oxides, and carbon monoxide (Table 3.7).
How is SO2 removal from flue?
For the removal of SO2 from flue gas, a wet process using calcium carbonate as an absorbent is most commonly adopted in commercial plants. The wet process shows a high efficiency but needs a large amount of water. SO2 is fixed in the form of calcium sulfate.
Why is flue gas desulfurization important?
Flue Gas Desulfurization (FGD) Processes. In many plants it is necessary to remove sulfur from the flue gases after the combustion process to meet environmental requirements.
How does flue gas desulphurization work?
How does it work? The FGD technology is based on a chemical reaction that occurs when the warm exhaust gases from the coal-fired boiler come into contact with limestone. This reaction removes 92% of the sulphur dioxide from the flue gas and converts the limestone into Calcium Sulphite.
What is flue gas desulphurization?
Flue gas desulfurization (FGD) is a set of technologies used to remove sulfur dioxide (SO2) from exhaust flue gases of fossil-fuel power plants, as well as from the emissions of other sulfur oxide emitting processes. When using a wet FGD scrubbing process, wastewater is generated, which must be treated before disposal.
Which gas is used in flue gas desulfurization?
As explained above, alkaline sorbents are used for scrubbing flue gases to remove SO2. Depending on the application, the two most important are lime and sodium hydroxide (also known as caustic soda).
What is FGD project?
FGD is a system which reduces the SOx in flue gas through chemical treatment and converting the captured SOx into a by-product such as Gypsum or Calcium Sulphate or Sulphuric Acid depending upon the type of mechanism used. Following are the type of FGD technologies available in the market. Wet scrubbing.