Why is high-pressure nitrogen supplied to the pressure tap pipe of the gasifier?
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Why is high-pressure nitrogen supplied to the pressure tap pipe of the gasifier? This post was last edited by houwang520 on 2009-4-11 00:07.]
Of course, it is to prevent the high temperature and high pressure gases from the vaporization furnace from damaging the instruments
It provides protection, but its flow rate is very low, so it does not affect the accuracy of pressure measurement
High-pressure nitrogen is a protective gas that serves four main functions: preventing the pressure tapping tubes from becoming clogged and thus affecting instrument measurements, protecting instruments from damage caused by high temperatures in the synthesizer, preventing oxidation and corrosion of the pressure tapping tubes, and enabling indirect measurement. There is an original post at http://bbs.hcbbs.com/viewthread.php?tid=429315&highlight=%B5%C2%CA%BF%B9%C5%C6%F8%BB%AF%C2%AF%C9%CF%D2%FD%D1%B9%B9%DC%CF%DF; this post was last edited by canjy on 2009-4-11 09:48
I’d like to add a couple of things. The flow rate is definitely low, and as for the accuracy of pressure measurement, the instrument can exhibit some deviation. For differential pressure measurement, it is possible to balance the backflow volume of the pressure tapping pipes at the upper and lower ends.
4 functions: preventing the pressure tapping tube from getting blocked and affecting instrument measurements, protecting the instruments from being damaged by high temperatures in the synthesizer, preventing oxidation and corrosion of the pressure tapping tube, and enabling indirect measurement.
How is the amount of purging determined?
The nitrogen flow rate should be as low as possible while ensuring that the pressure measurement port is not blocked; this helps to assess the impact on the accuracy of pressure measurements, and it also reduces the effect on the composition of the syngas as well as nitrogen waste.
Its main function is to perform backflow cleaning to prevent dust accumulation from causing blockages. The pressure guide tubes all lead from the annular space; the temperature is around 220 degrees, so this does not cause damage to the pressure guide tubes ； If it’s said that oxygen corrosion is a concern, that’s even more incorrect; the annular space is an inert environment with no oxygen present at all ； Adding nitrogen only promotes the condensation corrosion caused by ammonium chloride and hydrosulfuric acid ； If that’s the case, then a diaphragm type should be chosen.
Everyone understands the qualitative aspect of this purging volume, but I would appreciate it if those more experienced folks could advise me on how to quantify it
It has a reverse blowing effect. It is mainly to prevent coal dust from entering the pressure guide tube, thereby affecting the measurement accuracy.
Everyone has already explained it very clearly. The gas exiting at outlet 1 contains dust particles, which may clog the pressure tapping tube ； The temperature of the gas at the 2nd outlet is very high; after cooling, wet gas is produced. The gas contains sulfur, which can corrode the pipelines.
1. Keep the pressure sampling tube unobstructed. 2. Prevent slag from entering this tube. 3. Protect the tube from being damaged by high temperatures. 4. Use inert gas to prevent corrosion of the tube. 5. Common methods for indirect sampling