Can exhaust gas from hydrogen production be used as fuel?
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Dear prawns, I have seen that several materials mention hydrogen production tail gas as reformer fuel. Does the amount of fuel mentioned in the public works section include this part of hydrogen production tail gas? Thank you
Of course, including the amount of hydrogen production tail gas, generally speaking, it is relatively large, and there are many active ingredients that must be fully utilized.
Although the hydrogen production tail gas can be used as fuel gas for the reformer, the fuel quantity mentioned in the general public works section does not include this, because its calorific value is too small and is not enough for the reformer.
Hydrogen production tail gas can be used as reformer fuel
Thank you all, I checked some information and found that the calorific value of hydrogen production tail gas is between 6000-7000 kcal.
The hydrogen production tail gas should not be sent to the pipe network, as it will have a bad impact on the pipe network, and if the tail gas is not enough for your own use, don't take it out. The reason why the hydrogen production tail gas has an adverse effect on the combustion of other furnaces is that its components contain more hydrogen.
The amount of fuel mentioned in the utility section refers to the amount of fuel that needs to be provided by the external network. Of course, it does not include the amount of fuel used inside your device. When you perform combustion calculations, you should consider the participation of exhaust gas in combustion.
It can be used as fuel for the reformer. If it is absorbed by PSA and the exhaust gas pressure is too low, just add an exhaust gas compressor to boost the pressure to the fuel gas pipe network pressure. Because the amount of exhaust gas is still relatively small compared to the required amount of fuel gas, even if the calorific value is low, it will not have a big impact on the choice of burner.
It should not be included. The fuel in the utility part refers to the fuel that needs to be replenished to meet the operation of the device!
The amount of fuel gas does not include the hydrogen production tail gas, which is used as fuel for the hydrogen production reformer and accounts for approximately 60% of the heat of the reformer.
The tail gas of steam reforming hydrogen production has low calorific value and high carbon dioxide content, so it is not a very good fuel. Because the pressure is low, it requires additional power facilities for delivery or extraction, which is not very economical. It is generally used as reformer fuel. Some of the exhaust gases from purified hydrogen production are of high value and are generally processed after being pressurized.
PSA is used to produce hydrogen from catalytic cracking and cracking dry gas in the refinery. The pressure is less than 1 barg and cannot be returned to the fuel gas pipeline network. It can only be sent to the boiler through the low-pressure fuel pipeline network for burning.
The mass calorific value of the exhaust gas is also not low. The heat it provides accounts for about 90% of the heat of the reformer.
Of course, the exhaust gas from hydrogen production must be used as fuel. The harmful effects of emissions are twofold.: 1 Pollute the environment! 2 Safety issues!
The hydrogen production tail gas is also the PSA released gas. Its components include carbon dioxide, hydrogen, carbon monoxide, and methane. Carbon dioxide accounts for about 50%, hydrogen accounts for about 35%, and the rest is carbon monoxide and methane. There are many ways to recycle it. Commonly used ones are as reformer fuel, and after pressurization, it is used as raw material for synthesizing methanol.； In addition, carbon dioxide is purified and used in the food industry. Absolutely no way to waste it. As for what you said, "Does the amount of fuel mentioned in the public works section include this part of the hydrogen production tail gas?" ”In fact, this amount is generally not included.
According to the actual situation, the hydrogen production tail gas of PSA can be burned back by optimizing the PSA process, and can also enter the fuel pipe network. If the calorific value is as high as you said, the quality of the exhaust gas is considered to be very good, and it can be burned back completely.