Energy Efficiency in Industry , 1st Edition by J. Sirchis

By J. Sirchis

Court cases of a workshop prepared by way of the fee of the ecu groups, Directorate-General for strength, Berlin, Germany, 19-20 October 1987.

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The savings in energy costs have been particularly marked. In continuous processes the Energy efficiency in industry 36 application of Pinch Technology, rather than traditional design methods, on average result in energy savings of around 25% of total energy consumption. In retrofit projects savings of between 15 and 30% at a one year payback are a common result. With retrofit projects involving batch processes the savings can be significantly higher, Industrial case studies have demonstrated savings of 40–70% of energy consumption and cycle time improvements are common.

Exothermic heat of reaction is removed by hot oil which is used to reboil the adjacent stripper. Hot utility, QH, is applied to the fractionator reboiler by means of 3500 KPa steam from the central boiler house. There was an overall incentive on site for power generation and conventional examination by inspection had shown that waste heat from a heat engine could be used to replace the existing 3500 KPa steam to the fractionator reboiler. Since the process temperature was 220°C, however, the choice of heat engine was limited to a gas turbine.

As an example of how pinch technology is applied, consider Figure 1. The design shown is based on a recent case study. The evaporator plant on the left consists of a multi-effect system with a feed pump driven by a back-pressure steam turbine. Thus, the evaporator plant in itself represents a total energy system in which low pressure exhaust steam from the turbine is used for process heating in the evaporator. This appears to be an apparently well integrated CHP scheme with little scope for improvement—but is it?

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