What is the typical dust content in the process gas at the outlet of the carbon black scrubber tower?

The preliminary purification of syngas is generally achieved through washing, specifically via quench chamber washing, venturi washing, and carbon scrubber tower washing

The standard for the ash content in the process gas at the outlet of the carbon scrubber is 1 mg per standard cubic meter.

The composition of the raw coal, gasification temperature, etc., all have an impact; moreover, the structure of the scrubber tower can be optimized. . There are quite a few articles on this topic.

Current gasification processes all have values below 1 mg per cubic meter

The quench chamber of the gasifier, venturi, carbon scrubber tower, and its trays are the main parts for washing. Each point must serve a cleaning function; it is not possible to reduce the ash content in the gas to ≤1 mg/Nm3 relying on just a few specific areas

This post was last edited by wang06120325 on 2015-6-25 at 20:14. What was mentioned above is likely the design requirement, but it’s probably difficult to meet it in actual production, as there are many factors at play. Under normal circumstances, to maintain stable operating conditions, it’s necessary to compromise on this parameter. When using high-temperature ceramic filters for filtration in coal-fired boilers in the past, the dust content after filtration was around 0.2 mg/NM3. The condensate taken from the process gas entering separator No. 1 last time showed that the water quality wasn’t very good – it was turbid with a high dust content, which illustrates this point. Furthermore, even if dust from the process gas enters, a coarse gas filter is usually installed in front of the converter in the system, which can serve to filter and absorb it. However, there is a limit to everything; if the level is excessively high, it is necessary to conduct an analysis and investigation based on the actual circumstances. After all, the entry of large amounts of dust into the system can lead to catalyst poisoning, which represents a significant risk :):).

Raw gas contains ash, so there are naturally deviations between the operating values and the design values. When the raw gas contains ash, in order to prevent the pressure differences before and after the heat exchangers and the catalyst in the shift zone from being affected, some systems incorporate a pre-heater before the shift zone, others use filters, and still others adopt a combination of both approaches. However, the gasification process achieves the best cleaning effect; in the conversion process, there is no need to add additional pre-heating vessels or filters (two filters would even be required for switching back and forth). In other words, \"do one’s own work oneself\". For the newly designed units, more attention should still be paid to the design of the vaporization furnace, venturi, carbon scrubber tower, and its trays. Regarding the problems existing in the operating equipment, technical upgrades should be considered: by modifying relevant parts of the previous gasification system, many companies have achieved significant results, for example. . . . . . :lol