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When the whole kiln fires for hours, the billet in the kiln is red or dark red, and the fired bricks are all small in fire, the product quality does not meet the requirements, the strength is low, and the "raw brick" is often produced.
The reasons for the small fire in the whole kiln are:
First, the fire degree of the fireworker is inaccurate, and the small fire is regarded as large, especially when there is a large difference between the night light and the daytime, the difference in the temperature of the fire is greater.
Second, when adding external fuel, the external fuel is not added in accordance with the principles of "industry addition", "less addition" and "a small number of times", resulting in a large change in the heat of the kiln.
Third, the ash content of the fuel is too large, the calorific value is low, and the quality is not good. The coal input is still carried out according to the amount of better quality fuel, resulting in insufficient total heat in the kiln, so that the temperature in the kiln cannot rise to the required temperature.
Fourth, the use of air dampers is too high, and the entire kiln ventilation is too large, causing a large amount of heat in the kiln to be removed, and the temperature in the kiln cannot be raised to the temperature required for firing.
Fifth, the use of the damper is too low, and the ventilation in the kiln is too small, resulting in insufficient oxygen in the fuel burning in the kiln. The combustion intensity per unit time is very low. The heat generated by the fuel combustion is not enough to raise the temperature in the kiln to The required temperature.
In the case of a small fire in the whole kiln, the following operation methods should be adopted. To change the firing conditions in the kiln.
First, timely detect the temperature in the kiln and accurately grasp the fire in the kiln. Look at the trend of the temperature change in the kiln, determine whether the temperature in the kiln is going higher or lower, and provide a reliable basis for adding external fuel.
Second, when adding fuel, it is necessary to "look at the fire and add coal", "industry to add less", a small number of times, add fuel according to the burning speed of the fuel in the kiln, neither can make the fuel amount too small, not reach Even when the temperature is increased, the fuel volume cannot be excessive and incomplete combustion can occur.
Third, accurately grasp the calorific value of the fuel added to the kiln, and add fuel according to the heat required in the kiln. If the calorific value of the batch of fuel is higher than the calorific value of the original fuel used, it should be added less. If the calorific value of this batch of fuel is lower than that of the original fuel, it should be added more.
Fourth, when the ventilation volume of the whole kiln is too large, quickly lower each air gate to make the entire firing belt operate under positive pressure, that is to say, let all rows of the firing belt be tempered, and if necessary, the air intake at the bottom of the billet stack. Strict restrictions should be imposed to reduce the "postwind". After completing the above operations, you should start adding fuel frequently, and use a spatula to add dry fuel with a low water content. If the firing zone is completely cleaned, add heat-generating fuel to raise the fire. When the fire in the kiln returns to normal, the damper can be gradually raised, and dry fuel with a lower water content can still be added frequently, so that the front fire develops and gradually ventilates the kiln to accelerate combustion.
Fifth, when the whole kiln ventilation is too small, the air dampers should be quickly raised to make the entire firing belt in a positive and negative pressure working state, that is, the front of the firing belt is negative and the rear is positive pressure, there is a return Fire phenomenon. At this time, the air intake of the heat preservation and cold zone should be increased, especially the ventilation at the bottom of the billet stack should be increased to improve the combustion quality and heat exchange efficiency.