The difference between gasification efficiency and cold gas efficiency
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This post was last edited by lflsedin on 2015-11-27 at 22:03. Vaporization efficiency: the ratio of the chemical energy (calorific value) obtained from unit amount of fuel converted into gaseous fuel to the calorific value of the biomass feedstock. It is the main indicator for measuring the gasification process. Vaporization efficiency = / calorific value of dry feedstock (kJ/kg). Cold gas efficiency: Cold gas efficiency is defined as the ratio of the chemical energy of the gas produced by gasification to the chemical energy of the coal used for gasification. The chemical energy of gas and coal can be expressed using their respective lower heating values. Gasification efficiency without considering the sensible heat of gas and recovered waste heat. Can it be understood this way: cold gas efficiency is just one type of gasification efficiency, as compared to hot gas efficiency; it takes into account only chemical energy, while gasification efficiency may need to consider sensible heat and other factors? In the literature I have seen, the calorific value of the vaporization efficiency is only the LHV, without sensible heat or recovered waste heat. The efficiency of cold gas also uses the lower calorific value; aren’t the two different then?
It’s different; the vaporization efficiency includes the efficiency of sensible heat as well as the recovered waste heat.
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Reply to 3# HT-L: Well, thank you. When calculating the gasification efficiency, the sensible heat of the gas and the recovered waste heat must be included. For cold gas efficiency, only the low calorific value of the gas is required.
Let’s start with cold gas efficiency: it is the ratio of the chemical energy (lower heating value) of the gas produced as a result of coal gasification to the chemical energy (heating value) of the coal used for gasification； Speaking of hot gas efficiency: the ratio of the chemical energy (higher heating value) of the gas produced as a result of coal gasification to the chemical energy (heating value) of the coal used for gasification ； Both cold gas efficiency and hot gas efficiency are referred to as coal gasification efficiency, that’s how I understand it.