Study And Design On A New Type Of Quartz Melting Furnace Energy-saving Heating System

For the problems in the quartz melting furnace invested by Lianyungang, that is, unevenly heated quartz sand, high cost of graphite electrodes and energy consumption of quartz melting furnace, in this paper, a new type of quartz melting furnace energy-saving heating system is studied and designed.This paper will conduct the following work focusing on the above aspects:In order to compare the impacts of different sizes of quartz sand on the final fused quartz products, the quartz sand is crushed, grinded and screened for pretreatment, and the melting point and specific heat capacity of quartz sand of a 75 um particle size is measured.By comparing the products of different sizes and different qualities of quartz sand after heated and melted by medium frequency induction furnace, the following conclusion is made:the quartz sand of a particle size at 6-50mm can be completely melted only when heated to more than 1800 in electromagnetic induction furnace to meet the requirements of the fused silica.To design and build a new type of quartz melting furnace energy-saving heating system, the experimental system includes:high output power, graphite heating elements connected in series, insulation layer composed of boron nitride powder, magnesium oxide powder, high temperature refractory bricks and aluminum silicate felt, and water cooling system. By analyzing temperature distributions and changes of measuring points in melting furnace, the following conclusion is made:it can achieve the desired effect during heating by using boron nitride powder inside of graphite heating elements and magnesium oxide powder with the outside. The experimental station is simulated on the basis of experimental data and parameter correction is conducted after comparing and analyzing simulation and experimental values.On the basis of previous results obtained by the text-based numerical simulation, using corrected parameter and reconstructing three-stage model for continuous production furnace, a simulation is made for continuous production process in five days after quartz sand melted by valley electric and the following conclusion is reached:the designed insulation does not exceed the temperature ceiling it can withstand in continuous production process. The total power needed in continuous production process is 62.5 kW and the total energy consumption is 0.868 kW·h/kg. Now the power consumption of quartz melting furnace invested by Lianyungang is 1.786 kW·h/kg and the designed continuous production furnace theoretically saves 51% of energy consumption by the simulation.