In the normal operation of Ruchi pressure gasification, what is the impact of the steam-to-oxygen ratio on the gasification reaction?
Thread Content
Changing the steam-to-oxygen ratio actually serves to adjust the maximum temperature inside the gasification furnace. In solid slag-discharge gasification furnaces, it is first necessary to ensure that the ash does not melt into slag during combustion; on this basis, a sufficiently high temperature must be maintained to ensure complete gasification of the coal. For the same type of coal, the higher the steam-to-oxygen ratio, the lower the maximum temperature that can be achieved in the furnace. The consumption of steam increases accordingly, while the rate of water vapor decomposition decreases. The levels of carbon dioxide and methane in the gas exiting the furnace rise, whereas the levels of carbon monoxide and hydrogen decrease, resulting in a reduced efficiency in fuel utilization. However, a low oxygen-to-gas ratio will intensify the combustion reaction, increase the vaporization temperature, raise the levels of carbon monoxide and hydrogen in the exhaust gas, while reducing the levels of carbon dioxide and methane. As the steam decomposition rate increases, the steam consumption decreases accordingly, but the oxygen consumption increases. In summary, the control of the gas-to-oxygen ratio should aim to achieve the highest gasification temperature in the furnace, without causing the ash to melt. Let’s share better insights and discuss together!
It is best to control it at the softening temperature of the gray matter, but it is difficult to achieve this in practice; generally, the temperature is lower than the softening temperature. The actual process depends on a comprehensive assessment of the ash lock temperature, outlet temperature, analysis results, and ash samples.
During the operation, the adjustment of the steam-to-oxygen ratio should not be made arbitrarily or frequently.
The oxygen-to-vapor ratio should generally not be adjusted drastically; it is essential to regularly check the slag sample, otherwise the pressure chamber may get clogged. Once feeding stops, the furnace grate can be rotated forward and backward to break up the slag, but it should not be rotated in that direction for too long, as this may cause the filler in the furnace grate to leak; if feeding still doesn’t resume, the machine will have to be stopped. So when in doubt, it’s better to set it a bit higher and adjust it gradually.
To adjust the steam-to-oxygen ratio, it is necessary to consider the ash sample and the semi-analytical data