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Waste heat utilization

LCDRI devoted to waste heat utilization research for many years.There is a lot of experience in waste heat utilization with a large number of professions & technicans, dozens of inventions. Our institute can serve differenet customers according to different types of waste heat. We choose physics ,chemistry, biology from a professional perspective of using advanced technology to reuse the waste heat and return you a wonderful environment.

Process description

Waste heat is the unused heat given to the surrounding environment (in the form of thermal energy) by a heat engine in a thermodynamic process in which it converts heat to useful work. Waste heat is inevitable for any heat engine and the amount it produces compared to the amount of input heat gives a system its thermal efficiency. Waste heat is often dissipated into the atmosphere, or large bodies of water like rivers, lakes and even the ocean. Since waste heat is a necessary product of heat engines, efficiencies of power plants are limited (see Carnot efficiency) and therefore must burn more fuels in order to achieve their desired energy output. This increases greenhouse gas emissions, and contributes more to global warming.



In considering the potential for heat recovery, it is useful to note all the possibilities, and grade the waste heat in terms of potential value as shown in the following Table.
Waste source and quality
SN Source Quality
1 Heat in flue gases The higher the termperature, the greater the potential value for heat recovery
2 Heat in vapour streams as above but when condensed, latent heat also recoverabl
3 Convective and radiant heat lost from exterior of equipment Low grade - if collected may be used for space heating or air preheats
4 Heat losses in cooling water low grade- useful gains if heat is exchanged with incoming fresh water
5 Heat losses in providing chilled water or in the disposal of chilled water a) High grade if fit can be utilized to reduce demand for refrigeration
b) Low grade if refrigeration unit used as a form of heat pump
6 Heat stored in products leaving the process Quality depends upon  temperature
7 heat in gaseous and liquid effluects leaving process Poor if heavily contaminated and thus requiring alloy heat exchanger


Benefits of waste heat recovery can be broadly classified in two categories:

Direct Benefits:
Recovery of waste heat has a direct effect on the efficiency of the process. This is reflected by reduction in the utility consumption & costs, and process cost.

Indirect Benefits:
a)    Reduction in pollution
A number of toxic combustible wastes such as carbon monoxide gas, sour gas, carbon black off gases, oil sludge, Acrylonitrile and other plastic chemicals etc, releasing to atmosphere if/when burnt in the incinerators serves dual purpose i.e. recovers heat and reduces the environmental pollution levels.
b)    Reduction in equipment sizes
Waste heat recovery reduces the fuel consumption, which leads to reduction in the flue gas produced. This results in reduction in equipment sizes of all flue gas handling equipments such as fans, stacks, ducts, burners, etc.
c)    Reduction in auxiliary energy consumption
Reduction in equipment sizes gives additional benefits in the form of reduction in auxiliary energy consumption like electricity for fans, pumps etc..



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