B4CV-18-C shaft with keyway according to DIN Type BH Overv Bevel-helical speed reduction gearboxes B4

Flender/Flender Gear Units/Bevel-helical speed reduction gearboxes B4

Therefore, the efciency of furnace ( ) can be expressed as follows: /H1Heat output in the flue gas Heat input from the fuel/H1mh WFCN( where /H1ow rate of ue gas (nm3/), and /H1enthalpy of ue gas (kJ/nm. 8 Chakraverty 4 GASIFICATION Wood gasiers had been operated successfully to generate low-calorie gas at the beginning of the 2th century. Then good number of commercial gasiers were installed in theUnited States to provide electricity and street lighting to many cities. Within few years large number of automotive gas producers were operating all over the world. Surpris- ingly, these technologies had been almost abandoned after the 1s (. At present awide range of raw materials from agricultural residues to municipal solid wastes havebeen suitably used for gasication. It is important to note the following: gasier can be used to generate low- or medium-calorie gas for direct combustion or to produce fuel gas for an internal combustion engine. gasier has to be equipped with an effective gas cleaning system if the gas is to be used for an internal combustion engine. Some of the products of gasication are not only damaging to engines and burners, but also harmful to human beings. That is why these gases cannot be used ascooking gases. In general, the gasiers may produce some condensable volatile product such as tar that is not desirable. But its amount can be reduced signicantly by introducing the follow-ing three tar conversion mechanisms: () thermal cracking at high temperature, () com-bustion of the tar with air, and () catalytic thermochemical conversion. 4.1 Principles few important terms used in gasication are dened in the subsequent paragraphs. Gen- erally gasication refers to the process of thermochemical conversion of organic matter into the maximal usable chemical energy generated in the gaseous products (. Theequivalence ratio ,, is dened as the ratio of actual air supplied to the stoichio- metric air required for complete combustion. It can be