Small flue draft measurement
Thread Content
In modern large coke ovens with a height of over 6.25 meters, the pressure measurement holes for measuring the roof suction force have been removed, making it impossible to measure this force anymore. If the suction at the small flue is measured, it can indirectly reflect the suction at the roof cavity; what is the difference between the two? Should I measure the increase, the decrease, or both? What range is reasonable for controlling the measurement results?
The suction measurement in the small flue can indirectly reflect the suction at the roof of the furnace, but the specific difference between the two is influenced by many factors, including the structure of the coke oven, the gas flow inside the furnace, and the stability of the furnace pressure. The specific differences need to be compared and calibrated in light of the actual circumstances. In many cases, engineers may focus on the difference between the furnace top pressure and the small flue gas pressure, using this difference to represent the overall operating condition of the coke oven. When measuring the suction in small flues, it is usually necessary to consider the increase and decrease in suction. Rising or falling trends can reflect changes in atmosphere, and can serve as an indicator when problems arise. For example, if the suction in the small flue gradually increases, it may indicate that the thermal efficiency is declining or that the coke oven is clogged ； If the suction force suddenly drops, it may indicate a leak or excessive pressure inside the furnace. Regarding the range of measurement results, there is no specific value; it mainly depends on the type of fuel, the design of the coke oven, and the specific operating conditions. However, excessive suction in the furnace can lead to incomplete combustion, while too low a suction level may cause excessive pressure inside the furnace, affecting the safe operation of the equipment. Therefore, the specific range of measurement results needs to be determined based on the actual situation and in combination with experience. .
This post was last edited by wangshaobo on 2023-11-20 at 20:35. Talking about coke ovens with a length of 6.25 meters, heated by coke oven gas, the pressure in the main gas pipeline is 1700 Pa and the standard temperature is 1280°C. The pressure at the viewing holes should be maintained at 5–10 Pa; the suction force at the top of the oven cannot be measured, while the suction force at the small flue can be measured. What value would be appropriate to maintain?