【Weekly Topic】Discussion on the grate issues in fixed-bed gasifiers
Thread Content
For fixed-bed gasifiers, the importance of the grate is self-evident. The grates used in atmospheric-pressure and pressurized gasification processes differ significantly in terms of structure, material, and manufacturing process, which results in a larger price difference between the two types of grates. But in terms of basic theory, the temperatures that these two types of grates can withstand are similar, and neither of them is subject to pressure. We invite everyone involved to share their knowledge and research on the use of these two types of grates, and to discuss the reasons behind such a large difference between them ! There are rewards for participation!
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Consider the results of the combustion condition inside the furnace? Wait
What is the exact price difference between the two types of grates?
The grates of the Luchi furnace need to be larger, and it has more layers than the UGI furnace; there are no special requirements regarding the material either. The difference is quite significant
The grates of fixed-bed gasifiers, although subjected to similar temperatures, require different designs due to variations in gasification processes. In particular, pressurized gasification demands higher reliability than atmospheric-pressure processes; as a result, the grates used in pressurized gasification need to be of higher quality in terms of structure and material.
The grate of the Luchi furnace serves, on one hand, to distribute the gasifying agent; on another hand, it helps to maintain a stable bed height. Additionally, it is responsible for supporting around 90 tons of coal. In terms of the process, the grate keeps rotating, which helps to reduce wind pockets, thereby maintaining the bed height and the temperature of the ash； The grate in a atmospheric pressure furnace serves only the purpose of discharging ash; this discharge is done intermittently, with the grate rotating once every 2 hours and the ash being removed by a vehicle – it is a dry ash discharge method. However, nowadays the grate in atmospheric pressure furnaces has been replaced by a spiral ash discharge mechanism. The gasifying agent in a Ruchi furnace is sprayed from below the grate; it can also be a waste heat-based gasifying agent, whereas in an atmospheric-pressure furnace, the gasifying agent is injected above the ash layer. At atmospheric pressure, the furnace requires sulfiding and boiling.
The function of the grate in continuous gasification with pure oxygen at atmospheric pressure should be similar to that under pressure!