Grassroots design

There are two situations that can be encountered in process design. The first is in the design of new plant or grassroot design. In the second, the design is carried out to modify... 

Moderate operating parameters catalyst can be used as replacement for traditional toluene disproportionation unit, or in grassroots designs... 

Faria, D.C. and Bagajewicz, M.J. (2009) Profit based grassroots design and retrofit of water networks in process plants. Computers and Chemical Engineering, 33 (2), 436-453. 

For a grassroots design of a heat recovery system, the total annual cost consists of two parts, namely, the capital cost and the energy operating cost ... 

In the past, the retrofit methods based on the proeess pineh concept was widely used (Tjoe and Linnhoff, 1986 Policy etal., 1990 Shokoya and Kotjabasakis, 1991). However, the process pinch is developed for grassroots design and is fundamentally irrelevant to the retrofit scenario. The method (Zhu and Asante, 1999) to be discussed here is a two-stage approach identify the network pinch, the true bottleneck of an existing heat recovery system, and determine modihcations with minimum capital costs to overcome the network pinch— that is the reason why this method is called the network pinch method. 

In some cases when a grassroots design is improved via design changes, these changes could lead to reduction in both Opex and CapEx. In these cases, CapEx takes a negative value. Thus, CapEx savings contribute to NPV as well. 

---