### Abstract

Lingua originale | English |
---|---|

pagine (da-a) | 44-52 |

Numero di pagine | 9 |

Rivista | DESALINATION |

Volume | Desalination, Vol. 259 |

Stato di pubblicazione | Published - 2010 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Chemistry(all)
- Chemical Engineering(all)
- Materials Science(all)
- Water Science and Technology
- Mechanical Engineering

### Cita questo

**Advanced energetics of a Multiple-Effects-Evaporation (MEE) desalination plant.Part II: Potential of the cost formation process and prospects for energy savingby process integration.** / Piacentino, Antonio; Cardona, Ennio.

Risultato della ricerca: Article

*DESALINATION*, vol. Desalination, Vol. 259, pagg. 44-52.

}

TY - JOUR

T1 - Advanced energetics of a Multiple-Effects-Evaporation (MEE) desalination plant.Part II: Potential of the cost formation process and prospects for energy savingby process integration

AU - Piacentino, Antonio

AU - Cardona, Ennio

PY - 2010

Y1 - 2010

N2 - This paper represents the 2nd part of a paper in two parts. In part I a 2nd Principle analysis of a Multiple-Effects-Evaporation (MEE) process has been proposed. In this Part II perspectives for process improvement will be investigated, along two distinct research lines: the thermoeconomics-aided optimization of a newsystem and the increase of thermal efficiency for existing systems by a pinch-based plant retrofit. As concerns the first research line, a detailed productive structure for the plant stage (i.e. effect) examined in Part I is presented; the cost formation structure is then used to improve a simplified optimization process,revealing capable to properly reflect the interactions among exergy flows. It is shown that the flash at brine inlet and the exergy destruction at the pre-heaters, both apparently playing a secondary role with respect to heat transfer at the evaporators, become main sources of irreversibility when the ΔT between two consecutive effects increases. Then, as a corollary to the low exergetic efficiency calculated in Part I of this paper, the potential for exergy saving through process integration is discussed. Although detailed calculations are not included, a conceptual application of pinch-based techniques is proposed, which revealsscarce margins for integration at process level and a much higher potential for process/hot-utility integration. The use of heat cascades can be optimized looking at the Thermal Desalination Process as a blackbox; economics of cogeneration systems integrated with the desalination plant and targeted on heat supply, in fact, essentially depends on the cost of feed steam, fuel and electricity.

AB - This paper represents the 2nd part of a paper in two parts. In part I a 2nd Principle analysis of a Multiple-Effects-Evaporation (MEE) process has been proposed. In this Part II perspectives for process improvement will be investigated, along two distinct research lines: the thermoeconomics-aided optimization of a newsystem and the increase of thermal efficiency for existing systems by a pinch-based plant retrofit. As concerns the first research line, a detailed productive structure for the plant stage (i.e. effect) examined in Part I is presented; the cost formation structure is then used to improve a simplified optimization process,revealing capable to properly reflect the interactions among exergy flows. It is shown that the flash at brine inlet and the exergy destruction at the pre-heaters, both apparently playing a secondary role with respect to heat transfer at the evaporators, become main sources of irreversibility when the ΔT between two consecutive effects increases. Then, as a corollary to the low exergetic efficiency calculated in Part I of this paper, the potential for exergy saving through process integration is discussed. Although detailed calculations are not included, a conceptual application of pinch-based techniques is proposed, which revealsscarce margins for integration at process level and a much higher potential for process/hot-utility integration. The use of heat cascades can be optimized looking at the Thermal Desalination Process as a blackbox; economics of cogeneration systems integrated with the desalination plant and targeted on heat supply, in fact, essentially depends on the cost of feed steam, fuel and electricity.

KW - Cost minimization

KW - Desalination

KW - Multiple-Effects-Evaporation

KW - Pinch analysis

KW - Process integration

KW - Thermoeconomics

UR - http://hdl.handle.net/10447/54073

M3 - Article

VL - Desalination, Vol. 259

SP - 44

EP - 52

JO - DESALINATION

JF - DESALINATION

SN - 0011-9164

ER -