Discussion on the rational use of high-pressure nitrogen
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\"Issues related to the proper use of high-pressure nitrogen\" Problem description: When the high-pressure nitrogen produced by our plant’s air separation unit is supplied to subsequent processing units, the opening degree of the high-pressure nitrogen vent valve drops from 50° to 0° directly; yet these subsequent units still find that there isn’t enough nitrogen available (this happens on a periodic basis). However, most of the time the opening degree of the vent valve is 50°, which means that most of the nitrogen produced is wasted by being directly vented. Question: To reduce waste while ensuring systematic safety and stability. Do anyone have any good suggestions?
What process? Is nitrogen taken from the storage tank, pressurized by a pump, and then vaporized? 、、
This post was last edited by wcq1010 on 2015-11-23 at 11:19. 1. Nitrogen can be reused by liquefying it. 2. A smaller compressor can be used to reduce high-pressure venting. 3. Nitrogen can be reused as instrument gas (useful in areas where the instrument gas quality is poor, such as in northern regions during winter when temperatures are low). It is not recommended to use it indoors, as nitrogen asphyxiation is extremely dangerous.
My personal opinion: 1. Could a buffer tank of appropriate size be added to help mitigate the sharp changes in the back pressure of the nitrogen compressor as the gas pressure increases, thereby enabling better regulation of the compressor and contributing to process stability. 2. Regarding the issue of prolonged venting, could the vent valve be modified into a backflow valve?
What is the average daily amount of gas released, and how long does the release process last? If appropriate, a liquefaction unit can be installed; or, depending on the patterns of gas release and the volume of gas, a spherical tank can be used to help balance supply and demand~~
Changing it to reflux seems unrealistic as well; a decrease in the amount of nitrogen leaving the tower means reduced load, which in turn raises issues related to process stability. It might be necessary to vent the nitrogen at low pressure (but power consumption will definitely decrease)~~
High-pressure decompression is a hassle~~ Also, the amount of instrument air available is negligible compared to the amount of nitrogen needed~~ Hehe
Let’s use liquidation; this is more reliable! ! ! !
Increasing the buffer tank depends on their venting time and whether the peak and valley data are appropriate. The investment in high-pressure buffer tanks is relatively large; it’s generally better not to go ahead with such an investment. The backflow of the compressor is related to the control logic issues in their factory. It’s necessary to see how to minimize high-pressure venting; it’s better to use low-pressure venting. Reduce compressor energy consumption.
High-pressure pressure reduction is also not a problem; it’s just a matter of an adjustment valve. It depends on whether there is enough nitrogen. Haha...... If all the high-pressure vent gas is used that way, it’s better to use it for instrument air instead. Haha,,, Thus, this valve can also be used to adjust their peak values. It’s just my personal opinion; to achieve the desired results, reasonable modifications need to be made based on the conditions within their factory.
It is a liquid coming from the tower, with an internal compression process