How to operate load adjustment for hydrogen production using natural gas
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For adjusting the load in hydrogen production using natural gas, for example, in the converter, fuel gas is first added; after that, should the system be stabilized first, or should the water-to-carbon ratio be adjusted immediately after adding the fuel gas, along with the addition of steam and feed gas? Is there a time difference between adding fuel gas, adding steam, and adding feed gas?
When increasing or decreasing the load, fuel gas is usually adjusted first to maintain a stable temperature in the converter, and then the water-to-carbon ratio is gradually adjusted based on the changes in the fuel gas, that is, by increasing steam and feed gas. There should be a time delay between the adjustments among the three, to ensure that each parameter can transition smoothly to the new load level. Stabilize the fuel gas first, then gradually adjust the steam and feed gas to avoid instability in conversion efficiency or damage to the equipment caused by rapid adjustments. .
Should steam be added after adding the fuel gas first, after waiting half an hour from the time the fuel gas was added? Or should steam and the feed gas be added once the temperature at the outlet of the converter has risen?
After adding fuel gas, the exact time depends on the response time of the converter and its operating conditions. Usually, it is necessary to wait until the temperature at the converter outlet stabilizes before gradually increasing the steam and feed gas. If the outlet temperature can be raised steadily within half an hour, then steam and feed gas can be added thereafter. It is important to ensure a smooth transition in operations and avoid sudden changes. .
When increasing or decreasing the load, adjust the fuel gas first to maintain a stable temperature in the converter, and then gradually adjust the water-to-carbon ratio based on the changes in the fuel gas, that is, by increasing steam and feed gas. So, after adding the fuel gas first, how long should one wait before adding steam and feed gas? Should one wait half an hour after adding the fuel gas, until the temperature at the outlet of the converter rises, before adding steam and feed gas?
There is no fixed standard for the waiting time after adding fuel gas; it needs to be determined based on the actual circumstances. If the converter outlet temperature can rise steadily within half an hour, steam and feed gas can be increased gradually thereafter. It is important to monitor temperature changes to ensure that the temperature change caused by the fuel gas has stabilized before adding steam and feed gas. The purpose of doing this is to avoid fluctuations in equipment load or safety issues caused by improper operation. .
Add fuel gas, steam, and feed gas; just monitor the temperature of the radiant furnace as it rises.
First, add the fuel gas; after adding it, observe any changes. Once the temperature becomes stable, then adjust the water-to-carbon ratio. This can be done in stages, without having to make all adjustments at once.
Which temperature do you mean by basically stable? Is it the temperature in the upper furnace chamber? Or the outlet temperature of the furnace?
May I ask you, if I add fuel gas, will the outlet temperature of the converter take half an hour to adjust, and then can I add steam and feed gas? After I add steam and feed gas, how long does it usually take for the furnace temperature to change? After adding steam and feed gas, should I monitor the furnace temperature? Still the old furnace outlet temperature? If we look at the outlet temperature, it takes half an hour for there to be a change in the outlet temperature after adding 1% more fuel gas; then, it takes another half hour to see an effect from adding steam and feed gas. In this way, each additional load requires one hour. And then add a little more bit at a time?
Generally, it is in small amounts, multiple times, with frequent adjustments. The change in data is also a process; what’s important is to pay attention to the water-carbon ratio.