Self-Heat Recuperation Technology for Energy Saving in Chemical Processes

Abstract

An innovative self-heat recuperation technology has been developed for heating and cooling thermal processes, in which not only latent heat but also sensible heat are circulated in a feed-effluent heat exchanger of the thermal process by compressing the effluent stream without any heat addition. Applying this technology to the thermal processes, the amount of energy required was determined using a commercial process simulation tool, PROII. The proposed self-heat recuperation technology, in which the heat of an effluent stream is recuperated and reused for feed stream heating by gas and/or vapor recompression, was found to drastically reduce the energy consumption.

Self-Heat Recuperation: Theory and Applications

“…Self-heat recuperation technology (Kansha et al 2009) facilitates recirculation of not only latent heat but also sensible heat in a process, and helps to reduce the energy consumption of the process by using compressors and self-heat exchangers based on exergy recuperation. In this technology, i) a process unit is divided on the basis of functions to balance the heating and cooling loads by performing enthalpy and exergy analysis and ii) the cooling load is recuperated by compressors and exchanged with the heating load.…”

Co-production of Bioethanol and Power

“…Self-heat recuperation technology (Kansha et al 2009) facilitates recirculation of not only latent heat but also sensible heat in a process, and helps to reduce the energy consumption of the process by using compressors and self-heat exchangers based on exergy recuperation. In this technology, i) a process unit is divided on the basis of functions to balance the heating and cooling loads by performing enthalpy and exergy analysis, ii) the cooling load is recuperated by compressors and exchanged with the heating load.…”

“…A system in which such integration is adopted is called a self-heat exchange system. To maximize the self-heat exchange load, a heat circulation module for the heating and cooling functions of the process unit has been proposed, as shown in Figure 3 (Kansha et al 2009). Figure 3 (a) shows a thermal process for gas streams with heat circulation using self-heat recuperation technology.…”

“…However, to realize co-production, it is necessary to analyze and optimize the heat and power required for production in each process. Therefore, the authors have developed self-heat recuperation technology based on exergy recuperation (Kansha et al 2009) and applied it to several chemical processes for coproduction (Fushimi et al 2011, Kansha et al 2010a, 2010b, 2010c, Matsuda et al2010. In this chapter, self-heat recuperation technology is introduced and applied to the separation processes in bioethanol production for co-production.…”

Application of the Self-Heat Recuperation Technology to Deisobutanizer Column

“…Self-heat recuperation technology facilitates recirculation of not only latent heat but also sensible heat in a process, and helps to reduce the energy consumption of the process by using compressors and self-heat exchangers based on exergy recuperation [13]- [14]. Fig.…”