Purpose of setting the high-high pressure difference trip for the gasification furnace
Thread Content
What is the purpose of setting a high pressure difference in the gasification furnace as a trigger for shutdown? Is it meaningful?
It’s clear that the topic raised by the poster is quite amateurish. The pressure difference in a gasification furnace is an important indicator for its stable operation; a high pressure difference indicates that either the slag outlet is blocked or the pipeline leading to the process gas outlet of the furnace is blocked. If the blockage is severe and the pressure difference is very high, the furnace cannot be operated.
Personally, I don’t think it’s necessary to have an interlock to prevent exiting the vehicle, but an alarm threshold must be set. The hazards associated with high pressure differences were explained clearly above, but this is a process that requires constant monitoring by the personnel on duty; they need to make adjustments promptly when they notice an increase in pressure difference. Set a jump value for everything; let’s not turn on the furnaces anymore.
I agree with the opinion above; the establishment of any interlock is based on scientific reasoning and tested through practice, and it is the result of taking various factors into account. Interlocks that are not necessary should definitely not be installed
Why isn’t mention made of the downcomer or the quench ring blockage? Is the probability still low?
What you mentioned is reflected in the slag tap pressure difference. If the downcomer gets blocked, it basically means the plant has to be shut down, as the slag is difficult to handle. If the quench ring is blocked, the situation becomes even worse: it leads to uneven distribution of the quench water, which can damage the downcomer.
In the safety interlocks of the Texaco gasifier that I’ve seen, there is no parameter related to gasifier pressure differential; the pressure differential is used only for display purposes, to determine the extent of blockage at the slag outlet. If the control room detects a high pressure differential, it can take appropriate actions to address it, and if that doesn’t work, manual shutdown can be initiated. Please give some good suggestions
For Lurgi reactors, it involves the pressure-bearing capacity of the inner wall of the vaporization furnace; therefore, a large pressure difference must trigger a interlock.
Our company, SHELL, experienced shutdowns of the unit due to high pressure differences in the gasification furnace. During several shutdowns for maintenance, the true cause could not be identified; it was later found that there was severe scaling inside the furnace tubes. After removing this scaling, the gasification unit was able to operate stably and at full capacity.
The gas composition will change, and holding one's breath can affect the service life of the vaporization furnace
In fact, a high pressure difference in the gasification furnace is not solely due to a small slag outlet; it is necessary to assess the situation based on relevant indicators. For Texaco gasification furnaces, there is indeed no need to shut down the equipment just because the slag outlet is small. In the case of four-nozzle furnaces, even if the slag outlet is small, there is still a process to follow; timely action can be taken to resolve the issue and restore normal operation.
For this chain, it’s not necessary to have a connected parking system, but it is still important to call the police. Monitoring is an important indicator for the gasification furnace; it helps in determining whether there is a blockage at the slag outlet or problems with the process gas outlet pipes of the gasification furnace
The necessity of setting a pressure difference for the gasification furnace has been well discussed; going a step further, what range do you all consider appropriate for the pressure difference value of the gasification furnace? This value must ensure sufficient time for processing, without the need to frequently adjust the operation of the vaporizer due to a low setting.
We require a value of less than 50 KPA; generally, this value changes very little when the operation is stable. I’m not sure what range this value falls within for other manufacturers
It is generally between 0.3 and 0.8 MP, depending on factors such as the size of the slag outlet, operating time, and slag accumulation at the slag outlet.
The furnace chamber of the gasification furnace is a dark area; at temperatures over 1,000 degrees, it is impossible to detect what’s going on inside the furnace, and we can only rely on the signals from instruments to get information. So, if the pressure difference in the gasification furnace is high, it indicates that there is a problem inside the furnace. We must handle it promptly to prevent the condition of the vaporization furnace from deteriorating and to avoid accidents. Generally, the pressure difference is used to measure the operating condition of the slag tap; if the slag tap is not functioning properly, the pressure difference tends to increase!