Discussion on inspection items for Luchi gasifiers and coal lock operations

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The coal-lock gas holder can move up and down freely； The gray steam fan is operating normally, with normal temperature, current, and pressure levels ； All pumps are operating normally; the oil level in the oil cups and the current levels are within normal ranges, with no abnormal noises ； There are no leaks or spills inside or outside the factory building ； The fuel tank level is normal ； All lubricating oil pumps are operating normally, with normal current and pressure levels ； The jacket and waste tank levels are normal ； The frequency converter motor and reducer of the furnace grate are in normal condition; the temperature is normal and there are no abnormal noises ； There is no leakage or internal leakage in any of the hydraulic valves ； No leaks at the gray lock control station ； Coal lock **Lan – no leaks ； No leakage at the gasifier manhole ； There is no leakage at the flange of the washing cooler. For the coal lock and ash lock, a floating test must be conducted during each cycle: the pressure is set at 1.0 MPa during pressurization and at 2.0 MPa during depressurization, with the pressure fluctuating within 0.05 MPa over a period of 1 minute. The coal lock should add coal at least twice per hour, and the ash lock should discharge ash at least once per hour. The coal feeding and ash discharge cycle is operated based on the temperature-time curve. ①Charge coal lock PV1 to about 2.5 MPa, then open PV2. If the hydraulic pressure is high, open the TC valve in pulses at the equilibrium pressure, followed by opening the FC valve (which can only be operated once). Add coal for about 90 seconds, close the FC valve, and operate the TC valve in pulses several times to prevent leakage due to improper closure, then open PV1 to re-pressurize. ②When the pressure of gray lock DV1 is reduced to below 0.5 MPa, DV2 can be opened for pressure relief; DV1 should then be closed, and it is necessary to check whether the DV2 pipeline is blocked. After that, DV1 can be reopened until the water filling is complete. Release to atmospheric pressure; operate the switch of valve BC several times to discharge ash. After filling (8 minutes for large scale, 5 minutes for small scale), close valve BC. The temperature range of the expansion condenser is 80–50°C. After ash discharge, toggle the switches PV and BC several times to purge the ash lock, preventing buildup on the walls and material expansion. After the grate is stopped and the ash lock is pressurized, open PV and TC to perform back-blowing on the ash discharge chamber to prevent ash from adhering to its walls. For coal chutes, ash discharge chambers, and related components, the TC valve can be operated multiple times on-site to eliminate vibration-related faults; moreover, the ash lock can also be backblown using PV.