Chiller calcium, magnesium, and iron ions, but after being sprayed with ammonia water (pH 11-12) through the coke oven gas collector pipe, under high-temperature alkaline conditions, the calcium, magnesium, and iron ions in the coke oven gas are basically precipitated and transferred to the tar sludge in the collector pipe. When the chiller leaks, calcium, magnesium, and iron ions from the circulating water are leaked into the chiller condensate, and under alkaline heating conditions, these ions become flocculent precipitates.

A transparent plastic hose is connected to the return water pipe of the initial cooler, then the circulating water is slowly injected into the initial cooler from bottom to top. When the liquid level reaches the top of a pipe box cover, stop the water and observe for a period. If the level does not drop, there are no leaks in the pipe box. Use the same method to judge each pipe box cover individually until the leak is found. Then open the leaking pipe box, place stickers on each pipe opening, and fill the shell of the initial cooler with nitrogen. If the stickers are blown up, it indicates that the pipe is leaking. If there are few leaking pipes, seal both ends of the pipes with iron plugs. Use the same method to check for leaks in other pipe boxes. If there are many leaking pipes, consider replacing the entire pipe bundle directly.