Measurements On Gas-solid Multiphase Burner And Pipe Flow

The gas-solid multiphase flow was existed in normal ways. It was important to get the results of the characteristics accurately, which related to the system works safely and ecomically in the power plant.A novel method of investigation the diffusion characteristics of the gas-solid multiphase jet flow was presented based on optics wave theory in this work. The experiments were conducted to determine the particle concentrations distribution in the gas-solid jet flow from the burner with a former space combination elbow and an inner cuniform. The characteristics of lateral mixing and diffusion of the burner with side-located air were studied by a novel measurement method, which is based on the optics wave. Laboratory experiments were also performed to measure the characteristics of particle density, and discussed the mixture concentration at various cross-sections. The processing results of practical measured were given. The characteristics of resistance of the burner were studied by measurement method. Laboratory experiments were also performed to analysis the influences of former space combination elbow, inner wedge and swirling flow. The processing results of resistance measured were given.This method was also used to study the particle concentrations 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. In pulverized coal conveying lines the particle concentrations was affected by many factors. The particle in the horizontal pipe could be sediment, which could be cleared up and formed the even flow by the certain velocities. In the vertical pipe the gas-solid multiphase flow was complicated. The flow was in the dynamic status, which was mixed and diffused. The status of the center low concentration was not existed in pneumatic conveying by t he resistance between the pipe and particle. The particle concentrations in pulverized coal conveying lines were disordered. The results were different with diverse Z/D. In a circle there were many pieces of dense and manypieces of thin. But the flow concentration characteristics were disciplinary. The dense and the thin concentration were wrung in the course. The concentration could be affected by different velocity. As gas and particle flow through an elbow in a lean phase pneumatic conveying system, the particles stratify into a relatively small portion of the pipe cross- section, forming a dense rope-like structure. The experiments were carried to determine the effect of two closely spaced elbows on roping behave in a vertical pipe. The results showed that the combination of elbows resulted in a stationary rope adjacent to the pipe wall which spiraled around the inside of the vertical pipe. At the even velocity, the difference was vanished by raising the coal. But the follow characteristics of the coal were decreased.The experiments were carried out to determine the pulverized coal concentration distributing of the gas-solid multiphase flow, exited from pulverized coal pipe of 660MW generating unit in power station. The results showed such a method is effective to study the characteristics of the gas-solid multiphase jet flow, which could give information to design a burner with the ability of steady and low-pollution emission combustion in the power plant. The results also showed using this method to analysis steady combustion, making economical use of energy source and on-line measuring pulverized coal concentration was effective.A wavelet analysis method was used to analyze the particle concentrations distribution in pulverized coal conveying lines, which is a new approach to further study in the particle concentrations distribution of the gas-solid multiphase jet flow. It is through gas-solid concentrations measurement that gas and solid flow characteristics could be precisely analyzed. With wavelet describing concentration signal details and using restructure, the restructured signal was very similar to the original. The mo...