Sodium silicate melting furnace refers to a thermal equipment for producing solid sodium silicate made of refractory materials for melting sodium silicate batch materials.
There are various types of kilns (tank kilns) that can be used for sodium silicate production, which can be divided into the following categories according to their characteristics.
(1) According to the heat source used
① Flame kiln. The heat source is the combustion of fuel. The fuel can be gas, natural gas, heavy oil, coal, etc.
② Electric kiln. The heat source is electricity. It can be divided into arc furnace, resistance furnace and induction furnace.
③ Flame-electric kiln. The fuel is the main heat source and electricity is the auxiliary heat source.
(2) According to the continuity of the melting process
① Intermittent kiln. The batch material is put into the kiln for melting. After the sodium silicate solution is completely formed, the above process is repeated. It belongs to intermittent production, so the temperature of the kiln changes with time.
② Continuous kiln. Feeding, melting and forming are carried out simultaneously. It belongs to continuous production, and the kiln temperature is stable.
(3) According to the waste heat recovery of exhaust gas
① Regenerative kiln. The waste gas directly transfers heat energy to the grid body for heat storage, and then after another combustion cycle begins, the grid body transfers heat to the combustion air and coal gas to recover the waste heat of the waste gas.
② Heat exchange kiln. The waste gas transfers heat to the combustion air outside the tube through the tube wall to achieve waste heat recovery of the waste gas.
(4) According to the flow direction of the flame in the kiln
① Horizontal flame kiln. The flow direction of the flame is perpendicular to the direction of the sodium silicate solution.
② Horseshoe flame kiln. The flow direction of the flame is first forward along the longitudinal direction of the kiln and then turns back to form a horseshoe shape.
③ Vertical flame kiln. The flame advances along the flow direction of the sodium silicate solution, and the flame is discharged to the flue from the air intake before reaching the forming part.
The melting furnaces used in my country for the production of solid sodium silicate mainly include longitudinal flame kilns, heat exchange kilns and horseshoe flame kilns, etc. The use of heat storage horseshoe flame kilns with reasonable structure and good comprehensive utilization of thermal energy is promoted. The melting area of a single kiln must be above 20m2, and large and medium-sized kilns with a single melting area of more than 50m2 are developed
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