Optimization Design of the Grate Cooler Based on the Power Flow Method and Genetic Algorithms
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https://doi.org/10.1007/s11630-019-1188-3
Article ID: 1003-2169(2019)00-0000-00
Optimization Design of the Grate Cooler Based on the Power Flow Method and Genetic Algorithms MA Xiaoteng, CAO Qun, CUI Zheng* Institute of Thermal Science and Technology, Shandong University, Ji’nan 250061, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract: As an important process during the cement production, grate cooler plays significance roles on clinker cooling and waste heat recovery. In this paper, we measured experimentally the heat balance of the grate cooler, which provided initial operating parameters for optimization. Then, the grate cooler was simplified into a series-connected heat exchanger network by power flow method. Constructing the equivalent thermal resistance network provided the global constraints by Kirchhoff’s law. On this basis, with the objectives of the minimum entropy generation numbers caused by heat transfer and viscous dissipation, solving a multi-objective optimization model achieved the Pareto Front by genetic algorithm. Then selecting the scheme of the lowest fan power consumption obtained the optimal operating parameters of the grate cooler. The results showed that the total mass flow of the optimized scheme did not change significantly compared with the original scheme, but the fan power consumption was 25.44% lower, and the heat recovery efficiency was 88.43%, which was improved by 11.35%. Furthermore, the analysis showed that the optimal operating parameters were affected by the local heat load. After optimizing the diameter of clinker particles within the allowable industrial range, the clinker with particle diameter of 0.02 m had the optimal performance.
Keywords: power flow method, genetic algorithm, grate cooler, entropy generation minimization, multi-objective optimization
1. Introduction The cement production, as an important part of national economy, is the energy-intensive industry [1, 2], accounting for 7% of total energy use in China [3]. From 2014 to 2017, the cement production of China accounted for about 40%–60% of global cement production [4]. With the continuous technical innovation, the energy consumption of the cement plants is still about 3–5 GJ/t [5, 6], and the grate cooler is one of the highest energy consumption equipment in cement production and has great potential of energy recovery, which is mainly used
Received: Mar 18, 2019
AE: MA Weigang
for quenching clinker, recycling heat and redistributing exhaust air [7]. Therefore, it is of great significance to improve the energy efficiency and reduce energy consumption in grate cooler. In recent years, a large number of methodologies for the optimal design and control of grate cooler have been developed, which can be categorized into two broad types. One is to propose mathematical models of the clinker cooling process, the theoretical foundations of most of which are based on convection heat transfer principle [8] and porous media theo
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