Process energy efficiency

The formation of DME is a result of the selection of adequate catalysts. Methanol and DME plants achieve similar total process energy efficiencies. 

In contrast, if the membrane is an inorganic composition (e.g., a dense metal membrane or a nanoporous ceramic membrane), the membrane module may be operated at the elevated temperature of 450 °C. In this case, there is no need for optional HEX 2 as the fuel gas stream will exit the membrane module at 450 °C and pass to the burner without further cooling. In addition to a net increase in overall process energy efficiency, the elimination of HEX 2 also represents a reduction in capital cost for the system. 

The past 25 years have seen a tremendous improvement in the extrusion process (19). Productivity has increased 250-300% in this time. The process has evolved from an art to a science. The increased output is attributed to improvements in screw design and haul off equipment for increased cost effectiveness (70-80% lower than in the fifties). Processing costs have decreased due to energy efficiency. Plastic processing energy efficiency has increased 300-... 

Since foundries deal with a thermal process, energy efficiency and management of the generated heat are important enviromnental aspects. However, due to the high amount of transport and handling of the heat carrier (i.e. the metal) and due to its slow cooling, the recovery of heat is not always straightforward. 

Reduction of cokes consumption. Higher process energy efficiency. 

The truth of the matter is that there is large room for energy efficiency improvement. To find out the truth, you may ask a few questions What metrics are applied to measure the process energy efficiency What energy indicators are defined for the key equipment How do you set up targets for these indicators ... 

Therefore, we can come to agree that energy intensity is a more general concept for measuring of process energy efficiency indirectly. 

What are the major energy losses in a process This is the first question that people should ask before embarking on a significant effort to improve process energy efficiency. The answer to this question could lead to identification of major improvement opportunities and help to define the need for large energy improvement effort. 

FIGURE 11.8. Effects of catalyst improvements on process energy efficiency. 

Anon, (1994). Process intensification its potential in effluent treatment processes. Energy Efficiency Best Practice Programme R D Profile 44, May. 

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