Research On Key Technology Of Bag Dedust System For High Temperature Flue Gas

In these latter days, because of the serious haze, haze governance has become an important social development issues. Airborne dust, sulfuric acid, organic hydrocarbons and other particles in the atmosphere vitiate the air. When the visibility is less than 10,000 meters, obstruction to vision caused by nonaqueous aerosol system is called haze. Industrial dust, especially high-temperature flue gas from industrial kiln of glass furnace, is the main reason for the haze. Emission reduction and pollution control of smoke is a hotspot. In all the types of dust of the haze, the dust whose size is less than 10 micron is the most harmful to human health. Bag filter is suitable for trapping fine dust. Its dust removal efficiency can reach 99% and it is the most widely used dust removal equipment. Research on temperature, resistance and the ash cleaning of bag filter has important theoretical significance and practical value.A feasible scheme for glass furnace high temperature flue gas treatment is put forward in this paper. The relevant literature is reviewed. This paper makes clear the situation of high temperature flue gas treatment. The problems of bag dedust system are pointed out. The working process, dust removal mechanism and control system of the bag filter are analyzed in detail. In this paper, we prove that bag filter is a control object with time-varying, nonlinear, multivariable coupling.The temperature characteristic is extracted by the blind source separation. The temperature trend is forecasted by the neural network. For the problem of temperature control system of bag filter for high temperature flue gas, a kind of variable weight algorithm based on the fuzzy adaptive factor is put forward and its performance is analyzed. Three dimensional temperature fuzzy controller of bag filter is simplified and reduced the dimension. Membership function is improved. The variable weight adaptive link is added and the system performance is improved. The numerical simulation shows that the method has fast convergence speed and strong robustness. The effectiveness of the design method is illustrated. The stability of the temperature control system of bag filter is proven in the practical application.Airflow distribution and numerical simulation of air flow spraying of bag filter is studied. The rule of gas flow stream in the filter air box is studied by the method of CFD numerical simulation. The airflow distribution both in bag filter air box and filter, air pressure distribution in arbitrary cross section of each filtering unit in the box are simulated. Simulation calculation of pulse injection pressure distribution in air box is consistent with actual distribution. Air box structure improvement scheme is put forward, for the non-uniformity of pressure distribution. Pressure distribution of airflow inside the bag under different injection pressure is simulated, and analysis its influence of dedust effection and bag life.The numerical simulation results applied to the practical engineering design. The accuracy of numerical calculation is verified by field test.Analysis of the relationship between the resistance and dust cleaning system is made in this paper. The problems that exist in the traditional cleaning mechanism are analyzed. A new kind of dust control method(time, pressure and furnace pressure control of the cleaning mechanism jointly) is put forward according to the practical problems. According to the various factors on the cleaning effect, the structure of cleaning controller is simplified, and the cleaning determination controller and cleaning fuzzy controller are designed. The practical application shows that the cleaning control method is timely and effective. The dust collector pressure is stable. The cleaning control method has good practical value.The glass factory’s high temperature flue gas is tested and analyzed. According to the complexity of working condition, the temperature controller and the ash cleaning controller of the bag filter are designed and implemented by using fuzzy control method. The temperature of the bag filter controlled under the adaptive fuzzy control is in the optimum temperature range and the fluctuation range of the temperature is small. The bag filter cleans dust timely and effective and runs smoothly under the fuzzy control.Results show that the new method has good effect on control and high efficiency on the dust cleaning. The bag filter with new control method has stable operation. The life of the filter is increased. The energy conservation effect is obvious. This study is of great significance and application value for promoting the theory and technology of bag dedust system for high temperature flue gas.