There’s a question about old boilers
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In radiation waste boilers and convection waste boilers, nitrogen is generally filled between the water wall and the pressure vessel to balance the pressure of the syngas and prevent stress on the water wall. But in practice, how is the flow rate of nitrogen controlled? Because nitrogen and syngas are in contact at certain points within the waste heat boiler. Please share your opinions
The gas-filled (nitrogen + syngas) annular space also serves an important purpose: to prevent high-temperature gases from coming into contact with the casing. Nitrogen is just a very small part of it
In the radiation waste boiler section of the Shenhua Ningmei project, the equilibrium pressure of the outermost water wall is maintained by means of equilibrium holes designed above the third layer of water walls; process soot-blowing gas is used to establish equilibrium pressure by connecting with the interior of the furnace. Of course, medium-pressure nitrogen is introduced while driving the equipment; once the soot-blowing system is operating properly, a soot-blowing gas with a relatively lower temperature is used. This helps to maintain equilibrium pressure, ensuring that the outermost water-cooled walls are not subjected to excessive stress and that their temperature remains low, which in turn reduces the strict requirements regarding the materials used for the equipment. If the original poster pays attention to the actual structure of the equipment, they will understand the purpose of using two different types of nitrogen and soot-blowing gas in the same area.
Hello! Thank you! I’m grateful for the clarification. If there are changes in pressure inside the reactor, can the pressure of the soot-blowing process gas you mentioned adjust in a timely manner to match the changes in the pressure of the syngas within the reactor? If it can’t keep up, the water wall will be under stress. Thank you, and does the high-temperature syngas also end up in the soot-blowing process gas? Since I lack practical experience, please give me your guidance
Will the gas filled in the third layer mix with the syngas in the radiation waste reactor? No way, would the syngas leak so soon? Isn’t the gas filled with nitrogen? Is it going to be replaced by syngas? I don’t understand!