Due to the limitation of time and other factors, the transformation of 3200m3/h air separation equipment was officially started on July 10, 2000, and measures were taken for design, ordering and construction. The main system was fully completed on September 22, 2000, and put into trial production on September 23. The newly added 30m3 liquid oxygen and liquid nitrogen tanks were installed and commissioned in late October due to supply reasons. The total construction period is three months, and 109 maintenance projects have been completed, with a transformation cost of 5.5 million yuan. The unit carried out a 72-hour performance assessment from September 28 to October 1. All operational indicators were better than the assessment values, and the acceptance was qualified. The 3200m3/h air separation plant was officially delivered to Chengdu Seamless Steel Pipe from October 1st. The company's oxygen plant is used.
The actual operation proves that the 3200m3/h air separation plant has reasonable system configuration, perfect improvement measures, complete technical solutions and complete defect processing, thus ensuring the safety, stability and economic operation of the unit. In addition, in this transformation, we will also use the new technology of the Pangang Steel Oxygen Plant, which has been developed by the company for many years to develop the liquid oxygen self-circulation 0, 34 potential to improve the air separation and change production conditions, and apply it to the 3200m3/h air separation plant. , further improve the technical level of the unit, as well as the safety and economy of operation.
The transformation content is to ensure the reliable operation of the whole air separation system. In addition to the whole system maintenance, the following improvements have been made in the system configuration: (1) The technical performance optimization and review of the unit. We have made a rectification plan for the defects of the whole set of units, and at the same time, thoroughly improved the problems existing in the original design of the unit, and increased the production of liquid/oxygen self-circulation 0, / air separation variable production, 0, / rapid oxygen production 0, etc. The new technology also partially improved the process of the nitrogen water pre-cooling system, the air separation vehicle system and the crude argon purification system, which greatly improved the technical level of the unit.
(2) The original self-flexing filter is replaced with a self-cleaning filter, which reduces the suction resistance of the air compressor.
(3) According to the system review requirements, the original water cooling tower was replaced, and the air separation and nitrogen exhaust were recycled, so that the nitrogen water precooler achieved a very good cooling effect.
(4) The process of re-organizing the process of the nitrogen water pre-cooling system simplifies the process and operation.
(5) The original system requires a dryer and an electric heater to drive, the process is complicated, it is difficult to operate and control, and the energy consumption is high; we have improved the driving flow path and directly driven by air.
(6) The plate-fin heat exchanger group was tested for gas resistance matching, and a set of plates was replaced. The circulation of the plate-fin heat exchanger was improved to avoid the introduction of carbon dioxide and other impurities into the lower tower during driving. In addition, the instrument gas and the heated gas source of the adsorber were changed to the lower column pressure nitrogen.
Liquid oxygen adsorption is changed from liquid oxygen pump forced circulation to liquid oxygen self-circulation. Increase liquid return tower and air separation variable flow path. The argon purification system was modified to change the argon dryer from nitrogen to heat with process argon. In order to reduce the loss of cooling capacity of the system, all the heating pipes, purge pipes and instrument pipes of the air separation system have been replaced and treated, which completely solved the problem of running cold; the instrument control and electronic control system were simultaneously updated and modified. A 30m3, 018MPa liquid nitrogen tank and a 30m3, 118MPa liquid oxygen tank were added.
Production and acceptance status Since the 3200m3/h air separation plant was put into trial production on September 23, 2000, the air compressor is in good condition, the vane valve opening is reduced from the original 75b95b to 31b, and the operating current is reduced from the past. 20A, compared with the operation of 6000m3/h air separation equipment, the daily power saving is 40,000 degrees, saving 20,000 yuan, and the electricity bill alone can save 7.2 million yuan per year. The air separation plant was in good condition. At the oxygen on September 25, the oxygen extraction time was 36 hours, which was 12 hours shorter than the original design.
The air separation equipment will conduct a 72-hour performance assessment from 10:00 on September 28 to 10:00 on October 1. All operational indicators are better than the assessment values, and the acceptance is qualified. See the operating value after the restoration of the 3200m3/h air separation plant. The 3200m3/h air separation plant was officially delivered to the Oxygen Plant of Seamless Steel Tube Company from October 1st.
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