Water in the four-nozzle gasification furnace
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This post was last edited by shanxg on 2010-2-23 09:15. Before water entered our gasifier, the temperature at the dome increased, which caused the gasifier to reduce its load. The oxygen level is relatively lower than before, which results in an excessively low furnace temperature; as a consequence, the pressure difference at the slag outlet rises to 0.07. After taking over the shift, it was found that the temperature of the lock hopper was abnormal, so operations were carried out to raise the temperature of the gasification furnace. It was observed at the site that the amount of slag discharged had decreased, so the slag breaking machine was started. Large pieces were found on site, and the slag was quite sticky; at this point, the gasification furnace already contained water. Moreover, the level gauge of the gasification furnace is inaccurate; the control room maintains the level between 2.6 and 3 meters. The liquid level is at 2.4 meters, and it doesn’t rise even though the water inflow and outflow are increased. At the site, maintaining a liquid level of 1.6 meters (compared to 3 meters in the control room and 1.2 meters at the site before) led to more severe water accumulation, but by the next day during the daytime shift, the vaporizer at the site with a liquid level of 1.6 meters no longer had any water in it. The temperature of the brick plates was around 300 degrees; even after the temperature of the water used for flushing at the bottom of the furnace dropped, it took little time for that temperature to rise back to 300 degrees. However, the temperature in the gasification furnace remained at 270 degrees while there was water present. Please analyze the main reasons for the presence of water.
It is estimated that during the temperature-raising process, a large amount of gas is generated, along with a lot of heat, which in turn results in an abundance of water vapor. The relatively large gas volume caused water to enter the gasification furnace.
High temperature and large air volume? It can only be said that the heat load is high. When water was present, the outlet temperature of the syngas from the vaporization furnace increased by 4 degrees compared to before. This increase occurred when water was present
In 3# meiqihua, the gas within the gasification process contains water vapor; the heat load is high, and a large amount of vapor is generated during the quenching process, which results in a high gas flow rate.
The temperature is still high, and the heat load is high. The evaporation rate is also high; it seems that the vaporization furnace isn’t discharging slag properly, so the water quality must be poor.
I went in to the furnace to take a look. A lot of the bubble-breaking strips have fallen off, and it seems there’s also a lot of residue.
Sometimes check whether the downcomer is damaged or if there is any air leakage. Sometimes it may be due to poor dust removal in the subsequent system, which can lead to ash blockages; or untimely slag discharge, as well as false indications of a high liquid level in the bottom cooling chamber – all of these can result in water being carried along.