The issue of cleaning coke oven gas collectors
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What methods are used for cleaning the coke oven gas collection pipes? I used to do it manually on a regular basis, by using a long tool to scrape from the cleaning opening towards the center. Later, the diameter of the ammonia cleaning nozzles was increased (from 6 mm to holes shaped like flattened square sections or square holes); the 1-inch tubes used for purging at both ends were replaced with 1.5-inch tubes, and manual cleaning is no longer required. However, the ammonia pressure is sometimes below two kilograms; the temperature of the gas collection pipe is fine, but the current drawn by the ammonia water pump is a bit high. Are the above changes reasonable? For the 4.3-meter, 60-hole ramming coke oven gas collection system that has just been put into operation in our factory, the ammonia spray nozzles have a diameter of 6 mm; the cleaning nozzles have a diameter of 7 mm; and the water seal nozzles use orifice plates with a diameter of 10 mm ； The spray pattern for the pipe is 12 mm; I would like to ask various manufacturers to share any good methods they have for cleaning the gas collection pipes::handshake
High-pressure ammonia is generally used for cleaning, and some factories hire professional teams from Tianjin to clean the gas collection pipes using high-pressure water; their equipment can achieve a pressure of 700 kilograms. If the blockage is too severe, four points were selected on the negative-pressure pipeline; each point was cut to create a one-meter-square opening through which personnel could enter to clear the blockage.
Cleaning the gas collection pipes is part of routine work; it’s not possible to bring in outsiders for this task, unless the blockage is severe. Also, \"four points were taken on the negative-pressure pipeline, and each point was cut to create a one-meter-square opening.\" Since it’s a negative-pressure environment, how can the oxygen level be controlled with such large openings? “Have people go in to clear it?” It contains raw gas plus ammonia water – how do I get in?
For daily cleaning, use high-pressure ammonia water; a pressure of around 20 kilograms is sufficient.
It has always been manually added with high-pressure ammonia water. A better way should be found
The cleaning pressure for high-pressure ammonia water is 18–25 kilograms; if the gas collection pipe becomes blocked, manual cleaning using a rowing method is the only option
What to do if there is no high-pressure ammonia solution? Is it reasonable to increase the flow rate of the ammonia stream?
It is sufficient to use manual methods and high-pressure ammonia solution on a regular basis. The specific indicators should be determined based on the actual requirements of production.
Generally, the pressure of high-pressure ammonia water is between 20 and 25 kilograms, and it can be used for cleaning. If a blockage in the gas collection pipe does occur, manual cleaning is also necessary. If there is no high-pressure ammonia water pump, it is possible to appropriately control the valve for normal spraying during cleaning, and then restore it to its normal setting after the cleaning is complete. To meet environmental requirements, it is best to add a high-pressure ammonia water pump to achieve smoke-free coal loading. As for the issue of high current in the circulating ammonia water pump, it requires attention; a thorough inspection of the entire ammonia water pipeline, including the pump itself, is necessary to comprehensively analyze the reasons for the high current. As long as it is no higher than 10% of the set current, there should be no problem.
Ours is manual cleaning, so it’s done more promptly. Then clean it with ammonia solution.
We also carry out manual cleaning on a daily basis; the effectiveness depends on the dedication of our staff. For 5 years now, our factory has been using this method, and the results have been good.
Agree with what was said above – regular manual cleaning is necessary
We hired a professional team from Tianjin to carry out the cleaning, and the results were satisfactory. Manual cleaning alone is no longer sufficient to solve the problem. Is using high-pressure ammonia simply just a matter of adding a high-pressure pump? We don’t have high-pressure ammonia.