Management of Steam Power Plant Operation Patterns by Using CPFD Based Technology to Analyze Fuel Fluidization Characteristics in CFB Type Boiler

Abstract

The need for electrical energy nationally continues to grow every year, the government has issued a national energy policy. Consideration that most of the 86.59% of the national coal reserves are low rank coal types, namely subbituminous and lignite with high sulfur content characteristics. Circulating Fluidized Bed (CFB) Boiler PLTU Labuhan Angin has fuel flexibility and lower emission. The flow in the Circulating Fluidized Bed (CFB) Boiler of PLTU Labuhan Angin is very non-linear with non-uniform constituent materials including bed particles, coal and limestone, so geldart classification must be carried out. In CFB boilers, generally have a gas-solid system characteristic, namely the recirculating loop of particles separated into the reactor from the carrier fluid in a process that must run efficiently. Under operating conditions, the particle flux reaches a high particle flux of 10-1000 kg/m2 and a high superficial flux gas velocity of 2-212 m/s, so it is very possible to damage caused by wear. In order to maintain operational continuity, reliability and efficiency of power plants, improvement programs need to be carried out, one of which is related to carrying out Computational Particle Fluid Dynamic (CPFD) simulation models on the Circulating Fluidized Bed (CFB) Boiler PLTU Labuhan Angin. In this thesis, an analysis of fluid flow characteristics and particle motion in the combustion chamber of PLTU Labuhan Angin 2 × 115 MW carried out using a Computational Particle Fluid Dynamic (CPFD) simulation. The simulation carried out under normal operating conditions at the combustion chamber temperature which is close to the operating conditions at the design generating capacity (115 MW/unit). Computational Particle Fluid Dynamic (CPFD) simulation modeling in the Circulating Fluidized Bed (CFB) Boiler PLTU Labuhan Angin is expected to be used to determine the velocity of gas and particle flow in the combustion chamber, temperature distribution in the combustion chamber, the dominant area of erosion potential as a baseline for geometry modification and recommendations. operation optimization programs.