What does flue gas consist of?

Flue gas—the emitted material produced when fossil fuels such as coal, oil, natural gas, or wood are burned for heat or power—may contain pollutants such as particulates, sulfur dioxide, mercury, and carbon dioxide. Most flue gas, however, consists of nitrogen oxides.

What is the use of flue gas?

At power plants, flue gas is often treated with a series of chemical processes and scrubbers, which remove pollutants. Electrostatic precipitators or fabric filters remove particulate matter and flue-gas desulfurization captures the sulfur dioxide produced by burning fossil fuels, particularly coal.

What means 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).

Is flue gas toxic?

They can be formed as by-products in some chemical processes and in various combustion processes. Although the actual quantities of these compounds produced by modern thermal waste treatment processes are very low, their high toxicity requires their effective removal from the flue gas.

How do you calculate flue gas?

Composition of the dry flue gas from the stoichiometric combustion of 1 kg of biomass: N2 from theoretical air = 4.94 × 0.79 = 3.90 m3. N2 from biomass = 0.001 × 0.224 = 0.0002 m3. CO2 from biomass = 4.33 × 0.224 = 0.97 m3.

What is the difference between flue gas and fuel gas?

Flue gas is the gas exiting to the atmosphere via a flue, which is a pipe or channel for conveying exhaust gases from a fireplace, oven, furnace, boiler or steam generator. Quite often, the flue gas refers to the combustion exhaust gas produced at power plants.

How is flue gas cleaned?

An important part of flue gas purification is the removal of particulates from the exhaust gas. These dusts are partly produced during the incineration process, but also by the individual components of the flue gas cleaning process – such as the spray absorber, by spraying activated carbon and lime milk.

What is density of flue gas?

Pressure drop calculator, download version preview

Temperature [OC]	cp [kJ/kgK]	ρ [kg/m3]
100.0	1.068	0.95
200.0	1.097	0.748
300.0	1.122	0.617
400.0	1.151	0.525

What causes high CO readings on boiler?

If the oxygen level is set too low and something changes the combustion process can become ‘fuel rich’ as there is insufficient oxygen for all the fuel to burn. This can cause high levels of CO to be generated and in the extreme enough fuel to enter the boilers flue and ignite (explode) outside the combustion chamber.

Is flue gas homogeneous?

Statement (II): Flue gases can be treated as a homogeneous mixture of gases.

What is wet flue gas?

In wet flue gas desulphurisation, open spray tower absorbers have prevailed which are divided into two principal zones. At the outlet of the absorber, the clean gas is saturated and can be directly removed via a cooling tower or wet stack. Optionally the clean gas can be heated and routed to a dry stack.

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