Small perturbation reversal control method for kiln furnace

Abstract

Disclosed is a small perturbation reversal control method for kiln furnace which comprises determining the real requirement of the kiln manufacturing process and burning behavior, during the procedure of fire change which is less than 35 seconds, pre-treating the fuel and the proportion of combustion air quantity, during the procedure from natural gas cut-off to opening, increasing regenerator secondary air amount by a predetermined proportion, when the natural gas is opened, reducing natural gas incoming by a predetermined proportion, elevating gradually to a set value, reducing the secondary air amount of the multiple inputs step by step to the original set point, thus stabilizing the kiln furnace pressure within a dozen of seconds, which is beneficial for the stabilization for the melting tank vitreous body level.

Description

technical field [0001] The invention relates to a small-disturbance fire change control method for a natural gas system, a secondary air system, a burner protection gas system and a flue ram system during the fire change process of a glass furnace. Background technique [0002] In the process of melting glass, in order to prolong the service life of the furnace wall bricks, the horizontal flame combustion glass melting furnace usually adopts the method of exchanging left and right fuel supply on both sides of the furnace within a certain period of time, and intermittently exchanging unilateral combustion on both sides. The process involves the exchange actions of a series of on-site actuators such as natural gas system, secondary air system, burner protection gas system and flue gate system. Changes in the above processes will inevitably cause large fluctuations in the working conditions of the glass furnace combustion process. Unsatisfactory control will cause a large drop ...

AI Technical Summary

Problems solved by technology

[0002] In the process of melting glass, in order to prolong the service life of the furnace wall bricks, the horizontal flame combustion glass melting furnace usually adopts the method of exchanging left and right fuel supply on both sides of the furnace within a certain period of time, and intermittently exchanging unilateral combustion on both sides. The process involves the exchange actions of a series of on-site actuators such as the natural gas system, the secondary air system, the burner protection gas system and the flue gate system. The changes in the above processes will inevitably cause large fluctuations in the working conditions of the glass furnace combustion process. Unsatisfactory control will cause a large drop in the temperature in the furnace, a large change in the furnace pressure in the melting pool, and a large fluctuation in the glass liquid level. The above-mentioned large changes in the three elements of the melting furnace will definitely have a great impact on the melting process of the glass. The impact of high-quality glass cannot be guaranteed to be melted, and it also causes great harm to the service life of the furnace.

The original fire change control method for glass furnaces only realized the completion of the sequence process, and did not take any optimization measures for the stability of the furnace working conditions during the fire change process, which made it take a long time for the fire change process to stabilize. The temperature of the three elements of the kiln, the furnace pressure and the liquid level have a great influence, which seriously affects the quality of the glass

In the design of the original kiln exchange system, in order to achieve a small change in the furnace pressure after the ceasefire, Beijing Tenth Glass Design Institute, based on theoretical calculations, once installed a fan on the main flue, which is linked with the kiln exchange system and controlled by frequency conversion. A certain proportion of air is blown in according to the process requirements during the fire change process, so as to meet the small fluctuations in the pressure in the furnace. The disadvantage is that it needs to increase the hardware equipment, that is, a fan, a large number of air ducts, power and control components, fans, The installation of the air duct and the control panel makes the space above the flue, which is not spacious enough, more tense, which brings certain difficulties to the maintenance and repair of other equipment.

Images