What factors cause pressure fluctuations in the gas collection system, and what are the corresponding solutions?

During coal loading, a large amount of raw gas is generated instantly and enters the gas collection pipe. The activation of high-pressure ammonia water, instability of the suction pump, the operation of the flap valves, as well as inadequate sealing of the cleaning holes in the gas collection and suction pipes, all contribute to this issue. Additionally, there are pressure fluctuations in the company’s entire gas pipeline network. Moreover, different coke ovens connected to the same pipeline have different switching times; when other coke ovens are switched over, it inevitably affects the pressure in the current coke oven (due to the return gas). Of course, the raw gas system is also affected by these factors

The coke oven gas collection system is an important component of the coke oven system; it is responsible for collecting the coke oven gas generated during the production process, performing purification operations such as gas-liquid separation, cooling, and washing, so that the gas can be used for household heating, boiler operation, or heating in blast furnaces. In a coke oven, the stability of the pressure in the coke oven gas collection pipe is an important guarantee for the normal operation of the coke oven. Production is affected by various factors; events such as coke discharge, coal loading, bottom reversal of the furnace, changes in gas volume, and variations in the resistance of process equipment and pipelines can all cause significant fluctuations in the pressure in the gas collection ducts. When the pressure is too low, air will enter the furnace, causing the coke to burn, increasing the amount of ash, reducing the quality of the coke, placing more strain on the cooling system and shortening the furnace’s service life. When the pressure is too high, raw gas will escape, leading to leaks of smoke and fire, reducing the recovery rate of raw gas and causing environmental pollution. The solutions are: first, to ensure stable operation through careful adjustment; second, to implement an intelligent control system for the pressure of the coke oven collection pipes, which enables visual control of this pressure and keeps it within the specified operational range.

The smoothness of the gas pipeline also has a significant impact on the pressure fluctuations in the gas collection system. The unobstructed condition of the gas pipeline directly affects the fan’s output volume as well as the opening degree of the flap; however, when the blockage is severe, their effectiveness in regulating these parameters is limited.