Computational model of a solid fuel heating boiler

Abstract

The relevance of the research is caused by the fact, that there is no mathematical apparatus for simulating long-timeline dynamics of a solid fuel boiler. Simulation of its long-timeline dynamics is useful for determining annual costs, taking into account meteorological and technological features. In addition, the dynamic model of solid fuel boiler will help set up automatic control systems and detect dangerous deviations of parameters during the project. The main aim of the research is to develop a practically applicable productive model of a solid fuel boiler with sufficient level of detail. The methods. Ordinary differential equations for dynamic characteristics of a solid fuel boiler are formulated. The equations weresolved by the Euler method with subsequent iterative processing on the basis of the developed research software «TPU-Boiler». The results. The paper introduces a new one-dimensional nonstationary mathematical model of the fire-tube boiler. This model requires less computational time for qualitative simulation of boiler operation. The proposed model can be easily implemented and applied to solve engineering problems using the algorithm given. To test the developed model, the authors have simulated the operation of a «KVr-0,8» boiler using Irsha-Borodinsky lignite and Kuznetsk coal as fuel. The results of the numerical experiment show that the average integrated performance and gross efficiency are dependent on aerodynamics in the boiler and the time between fuel loads. The range of variation in the output values was 42 kW for the lignite and 75 kW for the coal. The range of variation in efficiency is 1,8 and 2,9 % for the lignite and the coal, respectively.

Keywords

• fire-tube boiler
• modeling
• heat transfer
• dynamic characteristics
• solid fuel
• coal