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What is the Significance of the Temperature of the Primary Cylinder to the Rotary Kiln?

Published:2022-04-14

The temperature of the primary cylinder is of great significance to the rotary kiln. Today, we will introduce the operational significance and function of the temperature parameters of the rotary kiln in detail.


1. Rotary kiln decomposition furnace temperature

Undoubtedly, the temperature of the calciner of the rotary kiln is an important operating parameter. In the second adjustment of the calcination operation, the intuitive adjustment is to adjust the temperature of the decomposition furnace. So, what is the temperature control of the decomposition furnace?



In fact, the temperature control of the calciner depends on the special situation of the company, not a fixed value. Of course, as long as normal calcination is not affected, the lower the temperature control of the decomposition furnace, the better. When the company tends to high KH calcination, the temperature of the precalciner must be increased, otherwise the clinker yield will be low and the quality will be poor. Of course, under normal circumstances, it is more appropriate to control the temperature of the calciner in the range of 860-890 °C, and occasionally increase the temperature to 940 °C, or even higher. However, the influence of sulfur-alkali enrichment is too high, and the preheater system is easy to form a liquid phase, resulting in blockage of the preheater. Too low will increase the load of the rotary kiln and reduce the output of the rotary kiln. It should be remembered that the decomposition rate cannot be controlled too high, 92-96% is appropriate. It is this less than 5% undecomposed raw material that prevents the sharp rise in temperature after decomposition and enables the decomposition system outside the suspension preheating kiln to operate normally.


2. The outlet temperature of the primary cylinder

The intuitive performance of the first-stage cylinder outlet temperature and negative pressure value is the energy consumption. There is no doubt that the outlet temperature of the first-stage cylinder is low, the coal consumption is low, and the negative pressure is generally low. The outlet temperature of the first-stage cylinder is high, the coal consumption is high, and the negative pressure is often high. But the temperature of the first-stage cylinder is not only related to the coal consumption, but also to the power consumption, the amount of feed, the pulling air, and the fuel brought from the raw material.


3. The variable relationship of primary tube temperature

The wind power consumption is high, the temperature of the primary tube is high, the negative pressure is high, and the coal consumption is high. The power consumption of the wind is low, the temperature of the first-stage tube is low, and the negative pressure is low.


The amount of feed also affects the temperature and pressure of the primary cylinder. The amount of feed is large, and the heat absorption is more. Also, heat absorption is fast and primary cylinder temperatures are low. At this time, due to the small amount of feed, the heat absorption is small, and the temperature of the first-stage cylinder is high, because the amount of feed is lower than the small negative pressure.


The tailings ingredients are tailings (including heat), such as coal gangue, fly ash, etc., part of the heat enters the raw material. When the raw material enters the kiln and enters the tertiary cyclone tube at about 700-800 degrees, the heat enters the tertiary tube and burns with the airflow. , because the temperature of the tertiary tube itself has not reached the decomposition of carbonate, the heat absorption is slow, and the outlet temperature of the primary tube rises, sometimes reaching more than 60 degrees. When the temperature of the primary, secondary and tertiary tubes is high, the temperature of the corresponding raw materials entering the kiln remains unchanged. Due to the large temperature difference and fast heat absorption, the load of the decomposition furnace can be effectively reduced. According to years of experience, for every 1kcal of heat added, the coal-fired decomposition furnace can reduce 1kcal of heat. While reducing coal consumption, the production of NOx can be effectively reduced because the temperature of the decomposition furnace can be controlled to be lower. It can greatly reduce ammonia consumption and promote the realization of ultra-low emissions.


Fourth, what is the temperature control of the first-stage cylinder?

The low temperature of the primary cylinder is different, some are lower than 280°C, and some are higher than 400°C. The temperature of the primary cylinder is greatly affected by process conditions, ingredients and operating habits. However, the higher the outlet temperature of the first-stage cylinder, the higher the coal consumption; the lower the temperature of the first-stage cylinder, the lower the coal consumption, this law will not change. This is because the exhaust gas generated by the first-stage cylinder outlet contains a lot of heat, and the heat at this time cannot be used by the firing system and is excluded from the kiln. In the case that the raw material has no heat, the temperature of the primary cylinder is related to the equipment, that is, the process conditions. Including the design method of the cyclone cylinder, the design and wear of the spreading plate, etc. Therefore, the temperature of the primary cylinder is not completely dependent on the operation, the temperature is as low as possible, the control temperature is low, the coal consumption is low, and the power consumption is low. As for how much to reduce, this is also affected by many aspects. In many cases, it is necessary to let nature take its course, and make process improvements if necessary. In a word, the lower the better.


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