Backup issues for water-coal slurry gasification
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What are the advantages and disadvantages of the approach proposed by slurry coal gasification furnace manufacturers, which involves considering the overall capacity of the gasification furnace rather than just the equipment used in it?
In fact, what limits the long-term operation of traditional water-coal slurry gasification processes are the process burners and refractory bricks. If a gasification process can overcome these issues, it is entirely possible to operate without a backup furnace. Especially when there are few gasification units available, the cost of installing an additional backup furnace is considerable. The advantage of using dedicated furnaces is that they enable continuous operation at full capacity over extended periods. If no backup furnace is designed, then it will be necessary to consider that any problems with the refractory bricks or the need to replace the process burners will prevent full-capacity operation. This is just my personal opinion.
Having a backup unit is also an option, but the gasification furnaces should not operate at full capacity on a regular basis. This way, when one furnace needs maintenance, the other furnaces can increase their output without affecting the overall system. However, for water-coal slurry gasification, it is advisable to have a backup unit available, so that maintenance tasks such as replacing furnace bricks and burners can be carried out as planned.
For the maintenance and replacement of burners and refractory bricks, current technology still cannot avoid certain challenges
I agree with your view; another point is the method of starting up and igniting the water-coal slurry. It is necessary to pre-heat according to a specific heating curve. It is not possible to start the engine quickly by ignition, and this is one of the key reasons why a backup furnace is necessary for water-coal slurry systems.