Waste heat from factories

They are designed for use at individual homes or in areas where space and size are a consideration. In addition to engine-driven microturbines, newer designs are powered by waste heat from factories or furnaces. 

Proposal of a new high-efficient gas turbine power generation system utilizing waste heat from factories... 

Thermodynamic characteristics of the proposed system, which generates power by utilizing the waste heat from a factory, were estimated. It has been shown that the system has exergetic efficiency of 57.5% and fuel-base efficiency of 63.6%. Potential of CO2 emission reduction was also evaluated assuming the case where the waste heat emitted from all the refuse incineration plants in Japan in 1991 were utilized in the system. It has been shown that introducing the system has the potential of reducing CO2 emission of 9.62 x 10 t/y. 

The result of systematic assessment of the BASF Ludwigshafen site is shown in Figure 60. The amount of sales products increased by 143 % from 1972 to 1992 however, the factory steam consumption decreased slightly. In 1992, only 33% of the steam requirement was supplied from primary energy. Whereas the fraction of steam produced by combustion of residues remains the same, the largest fraction today is supplied by the utilization of waste heat from chemical plants. Consequently the consumption of primary energy dropped drastically. 

Innovative ideas such as the use of a fan-coil heat exchanger to capture the waste heat from mold coohng water in a processing plant or from a film blowing operation for heating the factory... 

A solid fuel containing a mixture of wood flour and DB propellant as a binder can provide adequate heat energy to warm food and to prepare tea or coffee. These fuels are highly cost-effective as the ingredients, particularly the DB propellants, are either from the waste available in plenty from the ordnance factories or life-expired DB propellants available from the armed services. This also reduces the disposal problem of DB propellant waste to a large extent. 

The present type of evaporator consists of one or more vessels, each fitted with a steam chamber through which are fixed vertical hollow tubes. The steam chamber of the first vessel is heated with direct steam, or with exhaust steam (supplied from the exhaust steam receiver into which passes the waste steam of the factory) the treated lyes circulating through the heated tubes is made to boil at a lower temperature, with the reduced pressure, than is possible by heating in open pans. 

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