Optimization Operation Of The High Capacity Power Station Boiler And Measurement On Gas-Solid Multiphase Flow By Optics Wave Method

Boiler combustion optimization is to improve boiler efficiency and reduce nitrogen oxide emissions from boiler through adjustment of boiler operation parameters.In the paper, the NOx emission and carbon burnout characteristics were investigated through parametric field experiments. The effects of over-fire-air (OFA), flow rates, coal properties, boiler load, air temperature, air distribution scheme and nozzle tilt were studied.Because of the complexity of the NOx production mechanism, it is very difficult to establish an exact and simple mathematical model to estimate the production of NOx emission. On the basis of the experimental results, an ANN was used to model the NOx emission characteristics and the carbon burnout characteristics. The operation parameters that contribute to NOx emission and the boiler efficiency are used as the inputs of the neural network model, and economic parameters such as the boiler efficiency and NOx production are used as outputs. Data downloaded from DCS have been used to train the model. The completed trained NOx emission and unburned carbon model is used to predict the NOx emission and the unburned carbon in fly ash emitted from 300MW and 600MW boiler.In this paper, a Boiler Operation Optimizing model is built by combining Neural Network model and Genetic Algorithms. GA technique was employed to perform a search to determine the optimum solution of the ANN model, determining the optimal setpoints for the current operating conditions, which can suggest operators' correct actions to decrease NOx emission.Chapter six describes the principle for determining the parameters of particles, such as the size, concentration and its velocity with light fluctuation based on the random theory and light scattering theory. The experiments were conducted to determine the particle concentrations and size distribution in the gas-solid jet flow from the burner with a former space combination elbow and an inner cuneiform. The characteristics of lateral mixing and diffusion of the burner with side-located air were studied.This method was also used to study the particle concentrations and size distribution in pulverized coal conveying lines, which was a rope in a vertical pipe, formed by a single elbow preceded by a long, straight, horizontal pipe section and a combination of two elbows.