What should be the appropriate seal pressure for the water seal at the end of the main gas pipe in the coke oven basement?

Poster: Hello! May I ask what is meant by \"combustion pressure\" in the phrase \"with the combustion pressure not exceeding 3000 pascals\"? Is it the pressure of the coke oven combustion system? The pressure in the combustion system inside a coke oven can’t be as high as 3000 pascals, right? I don’t understand. Could you explain it? The water seal at the end of the main gas pipe in the coke oven basement is an automatic venting water seal; what are the specified standards for its pressure? I believe that during direction changes, after the gas supply is cut off, the pressure in the main gas pipeline rises sharply. To mitigate the damage that this increase in pressure can cause to instruments and other equipment, an automatic venting water seal is installed; the depth of its liquid level is 300 mm (approximately 3000 Pa). When the gas pressure exceeds 300 mm of water column, the gas overcomes the water surface and is discharged through the vent pipe, thereby protecting the instruments and other equipment.

It should be no lower than the boundary pressure of the coking system

2# wangshaobo: Combustion pressure and dynamic pressure as the gas main rises； The automatic diffusion explanation is quite reasonable.

During direction change, the gas weight is tightened down (the switching valve is closed), and the static pressure in the main gas pipe is slightly less than the pressure in the main pipeline; therefore, the height of the end water seal H must be greater than the maximum pressure that the main pipeline normally experiences. Taking our plant as an example, the pressure in the main pipeline for blast furnace gas must not exceed 14,000 Pa, while that for coke oven gas must not exceed 12,000 Pa. Generally, the height of the end water seal H should be 1.2–1.5 meters

5# 26722672 What I mentioned applies only to coke ovens heated with single-hot-type coke oven gas.

Strictly speaking, the main heating pipe in the basement should be called a branch pipe; the gas pipe that leads to the two coke ovens before it splits into two branches is referred to as a main pipe, while only the main gas pipe after gas has been recovered and purified can be called a principal pipe. In our plant, the height of the water seal at the end of the single-heating type coke oven is 1.2 meters. When the pressure in the main pipeline remains around 8000 Pa, the static pressure in the branch pipelines of the coke oven also stays around 8000 Pa.

7# 26722672: It is said that the sealing pressure should be maintained at 3000 pascals, in order to ensure that there are no fluctuations in the pressure of the other furnace during commutation, thus preventing incomplete combustion.

What is referred to on the 7th floor is likely the water seal of the main pipe, which is different from the water seal at the end of the coke oven.

The water seal at the bottom of our factory’s basement is 1.2 meters. The system pressure is over 8,000; the pressure in the basement main pipe ranges from 800 to 1,300 during calcination, with automatic flap regulation. During the exchange, the pressure on the basement main pipe was roughly equal to the system pressure; the gauge on the basement main pipe showed 6000, which was due to the gauge reaching its maximum range. The exchange has little impact on the heating of adjacent furnaces, as the system main pipe also has a water-sealing mechanism that releases more than 8,000 units when needed. I haven’t heard of any company that controls the water level in its basements at 3000 for discharge purposes. If any do, please explain the reasons and effects.

10# A Life of Drinking – Floor 8 for the reason.