Integrated short‐term scheduling and production planning in an ethylene plant based on Lagrangian decomposition

Abstract

A cracking furnace, which is the major unit involved in ethylene production, produces various petrochemical products ranging from ethylene to pitch and determines the production yield of an ethylene plant. It is essential to consider the operational performances of the cracking furnaces and to incorporate them into the whole plant's planning problem. Facing this challenge, this paper developed an optimization model, which integrates the scheduling problem of upstream cracking furnaces and the operational planning of the downstream units under a synchronized global time scale. Moreover, a modified Lagrangian decomposition algorithm is proposed for solving the large‐scale mixed integer nonlinear optimization problem. An industrial case study demonstrates the feasibility of the integrated model and the effectiveness of the solution algorithm.

An optimal control approach to scheduling and production in a process using decaying catalysts

“…Other methodologies for facilitating solutions in MINLP formulations of planning and scheduling problems include Lagrangian decomposition techniques (e.g. Mouret et al (2011), Wang et al (2016)), bi-level decomposition methods (e.g. Li and Ierapetritou (2009), Shi et al (2015), Lin and Du (2018)) and rolling horizon methods (e.g.…”

Ethylene Yield from Pyrolysis Cracking in Olefin Plant Utilizing Regression Analysis

“…The furnace is the key in the ethylene production industry [14] where its performance will determine the yield and quality of ethylene [15] produced. Coke will be formed over time in the furnace coil resulted from the rapid cracking of naphtha feed in the furnace coil.…”

Propylene Yield from Olefin Plant Utilizing Box-Cox Transformation in Regression Analysis

“…Olefin plant producing ethylene and propylene utilizing thermal cracking is often defined as the core of petrochemical manufacturing [7,8] due to its significant impact on the industry. The furnace is the primary equipment in the olefin production industry [9] where its safe and stable operation is essential [10,11] to determine the yield and quality of olefin [12] produced Fig. 1 shows the configuration of the steam cracker furnace in the studied plant while Table 1 shows the naphtha feed specification utilized in the steam cracker furnace during the study.…”