Dry gas seal leakage of rich gas compressor
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For the compressor’s dry gas seal, nitrogen is used as the medium for the pre-seal, main seal, and isolation gas. The normal consumption is 0.7 Nm3/h; during operation, power fluctuations can cause vibration in the shaft on the non-driving side, which triggers a three-out-of-four interlock shutdown mechanism. When operation is resumed, the nitrogen consumption for the dry gas seal becomes 3–4 Nm3/h. I would like to know the reasons for this change in nitrogen consumption; what could be the problem, or what factors might cause nitrogen leakage? (Nitrogen pressure; the valves for the dry gas seal remain unchanged)
Although the amount of nitrogen has increased by dozens of times, the total amount remains small, which is within the normal range of variation
Why does a surge cause high vibration and lead to an interlock shutdown?
I can’t explain the reason either, but for the compressors here, the air supplied to the first-stage seal affects the amount of leakage. To give an example of what happens here: before the compressor is started, 40 cubic meters per hour of air is supplied to the first-stage seal; once the compressor starts operating, the flow rate of air to the seal drops to below 30 cubic meters per hour. .
I’m not sure what you mean by ‘flickering electricity’
When the dry gas seal is in operation, an air film can be formed between the sealing surfaces, and the leakage of sealing gas is accordingly reduced. In the closed position, the sealing performance of the dry gas seal is not very good, after all, there are so many shallow dynamic pressure grooves on the moving ring.
Fluctuating voltage refers to the phenomenon where the grid voltage drops momentarily for a period of less than 1.5 seconds before returning to normal；
What drives the compressor? Steam? Still the motor? If it’s the motor that experiences voltage fluctuations, it shouldn’t trigger the vibration interlock, right? Are there four vibration measurement points on the non-drive side of your unit?
For the compressor’s dry gas seal, nitrogen is used as the medium for the pre-seal, main seal, and isolation gas. The normal consumption is 0.7 Nm3/h; during operation, power fluctuations can cause vibration in the shaft on the non-driving side, which triggers a three-out-of-four interlock shutdown mechanism. When operation is resumed, the nitrogen consumption for the dry gas seal becomes 3–4 Nm3/h. I would like to know the reasons for this change in nitrogen consumption; what could be the problem, or what factors might cause nitrogen leakage? (Nitrogen pressure; the valves for the dry gas seal have not moved.) Nitrogen, sealing, usage amount, compressor. Answer: The vibration of the unit has an impact on the seals; in my opinion, the reason for the high leakage rate at present is poor flexibility of the seals, as well as delayed compensation by the static ring, which leads to excessive leakage.