Site Navigation
- About Weiton
- Company Profile
- Company Outlook
- Corporate Culture
- Quality Certification
- Video Display
- News
- Industry News
- Company News
- Industry Knowledge
- Products
- Nitrogen Generator Series
- Oxygen Generator Series
- Hydrogen Generator Series
- Gas Purifier Series
- Gas Proportion Series
- Air Purifying Series
- Sales System
- Purchase Flow
- Leasing Flow
- Download
- R & D
- Technical Strength
- Experiment Platform
- Measured Data
- Case
- Green grain storage Honor users
- Europe and the United States Honor users
- Japan and South Korea Honors users
- Hong Kong and Taiwan Honor users
- Chinese Honor users
- Institute Honor users
- Contact Us
- Guest Book
- Contact
- Site Map
Home >> Industry Knowledge >> Nitrogen Generator Nitrogen intake valve arising from fluctuations in working condition equipment
Valve as fluid control components in the process of installation in the piping system used to control fluid pressure, flow rate and flow direction. Equipment in the process of nitrogen, the key event of valve failure if not in time, will cause serious impact on normal production, and even forced to stop.
Ningbo Wanhua Polyurethane Co., Ltd. KDON. 3200/7000 by the Sichuan-based nitrogen equipment Nitrogen Equipment (Group) Co., Ltd. construction, the use of molecular sieve adsorption purification, pressurized turbo-expander and structured packing on the tower, since June 2005 has run a good operation. Supporting the use of foreign air compressor compressor CENTAC a company, January 29, 2007 there was an air compressor intake valve as a result of positioning equipment failure caused by nitrogen fluctuations in working condition compressor surge or fault shutdown.
1 fault phenomenon
At 2:20 on January 29, 2007, the operator found through DCS control system air compressor displacement larger than the usual fluctuations, fluctuations in the rules of curve comparison square wave cycle of about seven minutes. At the same time a product is found to flow of oxygen and nitrogen, air compressor motor current, the main tower of cold liquid oxygen and liquid air liquid level, pressure distillation column and the above process parameters, such as resistance to fluctuate, and the waveform was similar to 0 nitrogen fluctuations in process parameters and equipment shown in table 1.
Table 1 KDON-3200/7000 equipment type nitrogen fluctuations in process parameters
Process parameters the minimum difference between the maximum
Displacement compressor / (m / h) 16630 13205 3425
Product oxygen flow rate / (m / h) 2145 2021 124
Nitrogen flow of products / (m / h) 6398 6151 247
Machine into the pressurized gas / (m / h) 3360 3265 95
Air compressor motor current / A 121.5 97.9 23.6
Expander speed / (r / rain) 47956 47004 952
Pressure air into the cold box / l'Pa 494 472 22
Pressure on the tower / kPa 42.4 37.8 4.6
Tower under the pressure / kPa 474.9 455.8 19.1
Machine inlet pressure booster / kPa 486 475 11
Outlet pressure booster machines / 1 【Pa 736 717 19
Resistance on the upper tower / kPa 0.25 0.237 0.013
Resistance under the paragraph on the tower / kPa 1.81 1.65 0.16
Resistance under the tower / kPa 11.3 10.8 0.5
Resistance of air-cooling tower / kPa 5.8 3.5 2.3
The main level of cold liquid oxygen / mm 2303 2240 63
Level of Tower Air Liquide / mm 517 464 53
Note: ① the main cold liquid oxygen level was observed for the values listed here only to show that the main cold liquid oxygen level also with the fluctuations in working condition; ② The above figures are the curves of DCS control system shows that the wave peak and trough values .
Similar fluctuations in the process parameters in 2005 have occurred in winter. When the night temperature dropped to about 12 ℃, the process parameters on the apparent beginning of fluctuations and with decreasing temperature, the degree of operating conditions on fluctuations gradually intensified, increasing the extent of the fluctuations, cycles shorten, there have been serious or even air compressor surge conditions such as abnormal. At this point in the monitoring of hydrocarbons to the main cold (c H) the total content and acetylene (H2) Although there is no standard content, but also with the working conditions they have smaller amplitude fluctuations in volatility.
Ningbo Wanhua Polyurethane Co., Ltd. KDON. 3200/7000 by the Sichuan-based nitrogen equipment Nitrogen Equipment (Group) Co., Ltd. construction, the use of molecular sieve adsorption purification, pressurized turbo-expander and structured packing on the tower, since June 2005 has run a good operation. Supporting the use of foreign air compressor compressor CENTAC a company, January 29, 2007 there was an air compressor intake valve as a result of positioning equipment failure caused by nitrogen fluctuations in working condition compressor surge or fault shutdown.
1 fault phenomenon
At 2:20 on January 29, 2007, the operator found through DCS control system air compressor displacement larger than the usual fluctuations, fluctuations in the rules of curve comparison square wave cycle of about seven minutes. At the same time a product is found to flow of oxygen and nitrogen, air compressor motor current, the main tower of cold liquid oxygen and liquid air liquid level, pressure distillation column and the above process parameters, such as resistance to fluctuate, and the waveform was similar to 0 nitrogen fluctuations in process parameters and equipment shown in table 1.
Table 1 KDON-3200/7000 equipment type nitrogen fluctuations in process parameters
Process parameters the minimum difference between the maximum
Displacement compressor / (m / h) 16630 13205 3425
Product oxygen flow rate / (m / h) 2145 2021 124
Nitrogen flow of products / (m / h) 6398 6151 247
Machine into the pressurized gas / (m / h) 3360 3265 95
Air compressor motor current / A 121.5 97.9 23.6
Expander speed / (r / rain) 47956 47004 952
Pressure air into the cold box / l'Pa 494 472 22
Pressure on the tower / kPa 42.4 37.8 4.6
Tower under the pressure / kPa 474.9 455.8 19.1
Machine inlet pressure booster / kPa 486 475 11
Outlet pressure booster machines / 1 【Pa 736 717 19
Resistance on the upper tower / kPa 0.25 0.237 0.013
Resistance under the paragraph on the tower / kPa 1.81 1.65 0.16
Resistance under the tower / kPa 11.3 10.8 0.5
Resistance of air-cooling tower / kPa 5.8 3.5 2.3
The main level of cold liquid oxygen / mm 2303 2240 63
Level of Tower Air Liquide / mm 517 464 53
Note: ① the main cold liquid oxygen level was observed for the values listed here only to show that the main cold liquid oxygen level also with the fluctuations in working condition; ② The above figures are the curves of DCS control system shows that the wave peak and trough values .
Similar fluctuations in the process parameters in 2005 have occurred in winter. When the night temperature dropped to about 12 ℃, the process parameters on the apparent beginning of fluctuations and with decreasing temperature, the degree of operating conditions on fluctuations gradually intensified, increasing the extent of the fluctuations, cycles shorten, there have been serious or even air compressor surge conditions such as abnormal. At this point in the monitoring of hydrocarbons to the main cold (c H) the total content and acetylene (H2) Although there is no standard content, but also with the working conditions they have smaller amplitude fluctuations in volatility.