When the hydrogen production unit is started up and the nitrogen temperature is increased, is it by running the circulation process while also venting?
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When starting up the hydrogen production plant, nitrogen is used for circulating heat to raise the temperature – is the venting operation carried out simultaneously while heating takes place? Nitrogen – feedstock buffer tank – air compressor – compressor buffer tank – feed gas preheating coil – desulfurization tank – mixer preheating coil – converter – waste heat boiler – medium-temperature converter – boiler feedwater preheater – water cooler – gas-liquid separation tank – nitrogen returned to the inlet of the feedstock tank (with venting to the gas-liquid separation tank)
When a hydrogen production plant is started up, nitrogen is usually used for circulation to raise the temperature. This means that while nitrogen is circulated within the device to raise the temperature, the vent is also opened to discharge the waste gas. Therefore, it is a common practice to carry out venting while raising the temperature in a cyclic manner. .
Where can I operate to control the heating rate of nitrogen?
It’s not because there’s a need to vent; nitrogen is merely used as a medium for circulating heat. Venting occurs only when the pressure becomes too high; under normal conditions, venting is not necessary. If the pressure drops, a little more nitrogen is added
The rate of temperature increase of nitrogen is controlled by regulating the flow rate of the fuel gas in the converter; when the flow rate is too low, it is controlled further by adjusting the pressure of the fuel gas as well as the speed of the ignition nozzle
Does that mean the converter needs to be heated up first before starting the nitrogen circulation? (To what temperature?) ) Has the systematic nitrogen circulation only just started? If the converter is to be heated first, without using any other medium, should it be burned dry with natural gas?
The temperature increase of nitrogen is generally controlled by a vent valve located after the third separator in the medium-pressure shift unit and before reaching the PSA unit, in order to regulate the pressure. No venting is required during the heating of nitrogen, unless the pressure exceeds the specified level. System pressure is replenished through the nitrogen make-up valve at the compressor inlet.
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First establish the circulation, then raise the temperature: cryogenic nitrogen circulation – ignition and temperature rise in the converter – thermal nitrogen circulation
Is the ignition and heating up of the converter a dry burn? To what temperature should the converter be heated for a nitrogen heat cycle?
First, establish a low-pressure cycle with a back pressure of around 5 kilograms, and then proceed with ignition. This manufacturer should be able to provide a construction plan.