What are the factors that affect the pressure of the glass furnace kiln?

September 29, 2018

What are the factors that affect the pressure of the glass furnace kiln?

The glass melting pressure system can be expressed by pressure distribution curve. There are two kinds of pressure distribution curves: one is the whole gas flow, the pressure distribution from the intake air to the exhaust gas, referred to as the gas pressure distribution; the other is the spatial pressure distribution along the glass liquid flow, referred to as the longitudinal pressure distribution.

The liquid level pressure of the glass is zero pressure or micro positive pressure, and the pressure at this point is collectively referred to as kiln pressure. The kiln pressure cannot be negative pressure. Under the negative pressure state, the flame space will suck in the cold air, change the kiln atmosphere, reduce the kiln temperature, increase the energy consumption, and make the temperature distribution in the kiln uneven. However, it should not be too large. If so, the furnace will be seriously burned, not only increases fuel consumption, but also exacerbates the burning of the kiln, and is not conducive to clarification and cooling of the molten glass.

The factors affecting the kiln pressure are chimney pumping force and airflow resistance. The chimney pumping force is provided by the chimney and the waste heat boiler induced draft fan. There are many reasons for the change of the resistance along the path. It often occurs in the later stage of the kiln use, such as the serious collapse of the regenerator compartment brick, the blockage and the air leakage of the grid, and the inlet of the flue. These reasons all make the flue temperature drop, the cross-sectional area reduce and so on.

When determining the kiln pressure index,  it is necessary to consider many factors, such as the external pressure, temperature, wind direction and furnace use time. Generally, the kiln pressure in summer is 2~4Pa lower than that in winter, and the kiln pressure in the later stage is slightly lower than that the previous period. The conversion operation is also one of the main factors causing fluctuations in the kiln pressure. With appropriate reversing equipment and self-control regulating parameters, the kiln pressure fluctuations during normal production can be controlled to ±Pa.