How much co2 does a standard industrial oil fired boiler emmitt compared to a wood pellet boiler?

It is not just how much CO2 is emitted but where the Carbon came from. In wood pellets or other biomass, the Carbon has been fixed from atmosphere during the growth of the plant in very recent time. In fossil oil the Carbon was fixed from plant life millenia ago and thus burning fossil fuel releases C that has been locked up for ages.How much co2 does a standard industrial oil fired boiler emmitt compared to a wood pellet boiler?
As mentioned elsewhere to do a comprehensive comparison you need to factor in the co2 used in production of the fuel.





my guess is the co2 per kg of fuel will be at a rough estimation approximately the same. Wood pellet's will be lighter than fuel oil, so for a given fuelling rate the wood pellet will produce less co2.





Given two boilers identical in all respects other than output power, the smaller will produce least co2. To be fair we really need to consider the boilers efficiency in the compassion's. The efficiency measures how much useful power is produced per unit of energy in the fuel. The greater the efficiency the less power is wasted, so less fuel has to burnt to produce a stated output power. (reducing C02 per unit fuel burnt)





A boiler which is 10kw and 50% eefficient will produce the same amount of C02 as a (ideal/theoretical) boiler of 20kw and 100% efficiency.





To do a comparison of C02 release between a number of boilers (using data which you'd probably be able to get hold of fairly easily) you need the calorific value of the fuel (kJ/kg), useful power output (kW), and the boiler's efficiency. If you know the chemical composition of the fuel the co2 released can be calculated (kg C02/ kg fuel), otherwise you'll need to get look this value up.





fuelling rate [kg/s] = useful power [kW] / (fuel calorific value [kJ/kg] * efficiency )





Multiply the fuelling rate by the C02 released by burning the fuel to get the co2 the burner produces every second.





Controlability should really be considered. A boiler which only burns fuel when heat needed usually has a better average efficiency. Oil's generally more controllable in this area than boilers which burn solid fuel. Gas is most controllable (many on-peak electric plants, use gas turbines, despite lower peak efficiencies, because they can be turned on/off faster than coal/nuclear power stations. This prevents power being wasted, which equates to a better efficiency, lower overheads, and possibly cheaper electricity )How much co2 does a standard industrial oil fired boiler emmitt compared to a wood pellet boiler?
This article may help you.