Luchy gasifier
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When the Luchi gasifier is started up, the liquid level in the gasifier’s jacket must be established prior to startup. Tianji uses medium-pressure boiler water at 4.0 MPA and 105 degrees Celsius; at this point, the jacket is at atmospheric pressure. As soon as the medium-pressure boiler water enters the jacket, it flashes, so how can a liquid level be established?
Dude, with 4.0 MPA and a temperature of 105 degrees, only a small portion of the water from the medium-pressure boiler flashes when it enters the jacket of the Ruhr furnace; even after flashing, the temperature of the boiler feed water drops enough to allow a liquid level to be maintained.
What was said upstairs is correct: when the medium-pressure boiler water at 4.0 MPa and 105 degrees enters the Lurgi reactor jacket, 1) part of it flashes, carrying away a large amount of heat, which lowers the temperature of the remaining boiler water and thus helps to establish a liquid level in the jacket. 2. Limited by the bypass flow control of the jacket safety valve, the internal pressure should be slightly higher than atmospheric pressure. 3. The actual temperature of the water in medium-pressure boilers can sometimes be a bit lower as well. 4. Under normal circumstances, there should be a certain liquid level initially; during the initial startup, fresh water is used to establish this liquid level, and once the temperature rises above 90 degrees, boiler water is used to replace it (at this point the vaporizer already has pressure), in order to prevent thermal stress. This post was last edited by wbp on 2009-4-11 17:18]
I would like to know: when the coal lock in a Lurgi furnace is pressurized or depressurized, how much does the gas flow rate at the outlet of the Lurgi furnace change? Also, I’m interested in knowing how fast this change in gas flow rate occurs. If anyone knows the answer, please let me know.
4.0 Mpa means that only a small portion has been flashed; generally, the original water is used to maintain the liquid level
When performing pressure relief for the coal lock in the Luchi furnace, the first impulse used is gas from the crude gas cooling unit, and this does not cause any fluctuations in the pressure or flow rate at the outlet of the vaporization furnace. In the two-stage pressing process, gas from the vaporization furnace is used for pressing only at a pressure of 2.5 MPa. Due to the low volume of gas used and the small pressure difference, as well as the presence of orifice plates, the gas pressure at the outlet of the Lurgi reactor remains constant and not very high. The flow rate may change slightly, but not significantly, so it will not have a noticeable impact on process control.
During pressure relief, the conical valve below the coal lock closes, separating it from the furnace. The furnace is filled with coal, and the reaction continues without any changes. The pressure-feeding pipe has a diameter of DN100, the orifice plate has a diameter of 30, while the gas outlet has a diameter of DN500; moreover, the pressure-feeding time is very short, so there is basically no impact.