Intelligent control system of an industrial lime kiln process

Abstract

In the face of strong competition, the pulp and paper industry is aiming at higher pro"tability through increased productivity and the reduction of costs. In addition, on the global scale the industry is facing increasing market demands for higher product quality, more specialty products and improved production #exibility and environmental protection. Consequently, extensive research is being conducted to improve existing processes. One alternative, which is gaining increasing attention within the industry, is the improved control of existing processes by means of intelligent systems. In this paper, an intelligent kiln control system is presented. In the system, neural network models are used in conjunction with advanced high-level controllers based on fuzzy logic principles and a novel linguistic equation approach. Finally, the testing results of the system are presented and discussed.

Otimização Do Controle Da Temperatura Central De Forno De Redução De Minério Em Resposta Às Flutuações Na Vazão De Óleo Combustível Alimentada

“…Estes modelos são criados a partir de resultados obtidos ao se executar testes de resposta a degraus aplicados às variáveis de processo durante condições normais e estáveis de operação dos fornos de redução de minérios (Järvensivu et al, 2001).…”

Total and extractable heavy metal, phosphorous and sulfur concentrations in slaker grits from the causticizing process of a pulp mill for use as a soil amendment

“…The accumulation of NPEs in the pulp mill's bleach plant may result in scaling problems and filtration failures, and they can also catalyse the decomposition of expensive bleaching chemicals, thereby reducing bleaching efficiency (Jemaa et al, 1999). In addition, NPEs cause operational problems such as scale formation on washers and the plugging of process Figure 1 The causticizing process as a part of the pulp mill chemical recovery circuit (Järvensivu et al, 2001;modified). equipment. The removal of NPEs from the recovery cycle is therefore necessary in order to reduce operational problems caused by their build-up and precipitation.…”

“…The removal of NPEs from the recovery cycle is therefore necessary in order to reduce operational problems caused by their build-up and precipitation. The NPEs and other insoluble materials are purged from the recovery cycle in the form of green liquor dregs and as slaker grits (Parthasarathy and Krishnagopalan, 1999;Järvensivu et al, 2001). However, total metal removal is not the target because a specific metal profile is required for effective peroxide bleaching; for example, magnesium has a positive effect on bleaching and viscosity, and protects the pulp from cellulose degradation (Jemaa et al, 1999).…”

Dynamic modeling of a multiple hearth furnace for kaolin calcination

“…Mechanistic models have proven to be an excellent tool for gaining deeper understanding of processes and their behavior. [5][6][7] The development of mechanistic models is supported by the numerous studies of the reactions related to kaolin calcination. For example, the fundamentals of kaolin calcination and classification of different calcined kaolin grades have been previously introduced in Murray.…”