Station of preparing Nitrogen
Pure Nitrogen Plant 99%
There was a request from a cryogenic engineering company to build a machine to generate nitrogen. In fact, we had to repeat with the maximum similarity a similar machine created in Europe. The format of the issued terms of reference was focused on embedded electronics. After thinking about the concept, we came to the conclusion of optimizing the solution on OWEN equipment.
What is selected from OWEN:
PLC110-220.30.R-M - 1 pc
SP310-R - 1pc
МV110-224.2А – 1 pc
MV110-220.8AC - 1 pc
MU110-224.8I - 1 pc
BP120A-24 - 1 pc
The station itself consists of the following equipment:
- Air compressor (Rameza СБ4_С-100.OLD20-3T_10)
- Dehumidifier (Ceccato_CDX4700)
- Relief solenoid valve (VXZ240FGAXB)
- Purge solenoid valve (VXZ240FGAXB)
- Soft feed solenoid valve (VXZ240FGAXB)
- Solenoid valve for feeding the product into the vessel (AV2000-F02-5YOB-A)
- Air pressure sensor after dryer (PSE530-M5-L)
- Pressure sensor before flow regulator (PSE530-M5-L)
- Dewar nitrogen pressure (PSE530-M5-L)
- Oxygen sensor (Oksik 9-a)
- Flow meter (PFM750-F01-C)
- Flow regulator (ER104-92AP)
- Level gauge (Cryogauge 242)
- Compressor (Sumitomo-F70)
As part of the creation of program documentation, the following were developed:
1. Options for external interfaces;
2. Description of the operating modes of the installation;
3. Description of access levels;
4. Description of the system schedule interface.
5. General terms of reference.
6. Description of the algorithm.
7. List of blockings and protections.
8. Input-output tables.
9. Description of variable setpoints of the system.
10. Equipment specification of the automation cabinet.
11. Album of video frames.
12. List of emergency messages.
13. PLC-ARM interface.
14. Electrical circuit diagram.
15. Description of interface exchange.
During the development of the documentation, various issues were raised. For example, control algorithms sometimes conflicted with the action of protections or there were some hardware connection problems. When creating circuit diagrams, a lot of questions “surfaced”, such as calculating power. These issues were successfully resolved before the start of work on the purchase of equipment and assembly of the cabinet.
Application software implementation
The software product was developed and subsequently tested on simulators, which made it possible to eliminate all errors in the interaction of components and debug the interface between the panel and the controller. The difficulty was writing a free ASCII protocol to control the Japanese Sumitomo helium compressor. With the active assistance of the Customer, we were able to understand the exchange of telegrams between devices and understand the basics of this exchange.
Remote debugging and commissioning
The customer assembled the cabinet on his own. Debugging and commissioning were carried out remotely, which made it possible to reduce labor costs by saving time on field trips. First, we achieved reliable reception of signals from I / O modules, then the passage of control actions to the equipment. Then we proceeded to the physical debugging of all the given algorithms.
We spent quite a long time with the exchange between devices using the free ASCII protocol, but in the end we figured out the features and everything is working satisfactorily at the moment.
This is what the panel looks like (commissioning photo)
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