Four-nozzle oxygen inlet section valve
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Our company requires that this valve be manually closed when the vaporization furnace is shut down. Why isn’t this valve interlocked with the burner shutdown? On the oxygen pipeline, there are two shut-off valves and a flow control valve as part of the burner shutdown interlock system; between these shut-off valves, there is a nitrogen isolation valve. Isn’t it advantageous that the valve for supplying oxygen to the process section also shuts down in an interlocked manner? There’s no need to waste time closing this valve while parking the system; when stopping, it’s necessary to immediately isolate the high and low pressures of the system, maintain pressure within the system, reduce the flow rate of the cooling water, and increase the water circulation within the system – time is quite limited in such situations.
After the gasifier is shut down, the two oxygen valve cut-off valves will close in an interlocked manner first, and the slurry cut-off valve will also close after 3 seconds [adjustable]. The personnel on site need to immediately close the manual valve of the oxygen burner before closing the manual valve of the slurry burner. This is mainly to prevent internal leakage in the shut-off valve and failure to close it properly, which could lead to a peroxide explosion.
Does your company have proportional control for the oxygen-to-coal ratio in the vaporization furnace?
If these valves are closed in a coordinated manner, although the shutdown system sends commands to close them all at the same time, their response times vary. What would happen if, during the process of closing these valves, the large valve in the intake section closes the fastest... You can imagine it. Every setting on the system has a specific reason for existing. Sometimes we don’t understand why certain settings are there because we don’t know enough about them. The primary purpose of all safety mechanisms is to ensure safety; ease of use comes second, as safety is of utmost importance after all. Safety and convenience represent a delicate balance: if you prioritize safety, convenience will be reduced; if you prioritize convenience, safety will inevitably be compromised. If this inlet section valve is not operated in a continuous mode, it doesn’t take much time or effort to simply close it by using the mouse on the control computer
If the inlet section valve is closed faster than the two shut-off valves when stopping the burner, it will result in low pressure behind the section valve; synthetic gas and coal slurry may then enter the oxygen pipeline, where the synthetic gas could undergo a peroxide explosion. The particles present may, upon restart, strike the oxygen pipeline and generate sparks that lead to an explosion. Valve position detection is installed between the section valve and the shut-off valve; if the valve position of the shut-off valve is detected to be 0, the section is closed. Alternatively, a timer can be set to trigger closure after a certain delay period (this time can be determined by first measuring the time required for the shut-off valve to close)
Yes, different proportions of coal result in differences
It’s just a simple dual-loop proportional control system; are the proportional fluctuations large? Our company doesn’t yet have proportional control, so we want to add it
It’s just a simple dual-loop proportional control system; are the proportional fluctuations large? Our company doesn’t yet have proportional control, so we want to add it
This post was last edited by WindwardEagle on 2017-6-27 at 20:56. Is the oxygen-coal ratio simply a double closed-loop proportional control? Are there significant fluctuations in this proportion? Our company currently has no proportional control system, so we intend to implement one
I don’t know much about this; I haven’t reached that level of understanding. Sorry