Xu Hao Wang Song welcome good people
At the domestic air industry has been widely adopted in all low-pressure adsorption zeolite-purification, with pressurized turbo-expander, regular packing on the tower, the entire distillation system argon, DCS and other computer-controlled air separation and optimization of new technologies. However, all manufacturers in the stable operation of equipment, performance guarantee, in particular, argon products different from the situation.
Since argon in the air only 0.932 percent of the content of argon boiling point between oxygen, nitrogen, and difficulty of separation too large; argon air separation plant with a relatively oxygen, nitrogen air separation plant configuration, complicated process, the crude argon column The establishment of the status of the main tower of the conditions require high nitrogen Cypriot temperature range of small, cold boxes generally higher than 55 M, the fractionating tower system stress, such as demanding compensation for a series of objective factors, makes the whole system of argon distillation of the availability of technology Certain degree of difficulty.
Many have been running the air separation equipment, is often oxygen, nitrogen products standards, but the system is always difficult to normal argon system put into operation. As for the main tower of Ar after the state of instability, users had to stop the system argon system, to the acceptance of the equipment left behind regret that assessment.
Therefore, the air separation system argon performance users often used to direct factory technical evaluation of strength and the importance of product quality standards.
Kaifeng Group of the Yellow River air separation equipment in order to improve the overall performance, particularly in the preparation of argon products, to ensure system-wide distillation argon for the reliable operation of the subject, launched a technology research. I sum up in the air separation plant operating experience at the same time, collect a lot of air operations at the scene actual data, the design and manufacture of equipment in the process of comprehensive analysis of state quality control measures, to find a solution argon products shipped to the difficult process control methods . Are: use of simulation software packages ASPEN air separation process, and optimize the design parameters; distillation systems and the rational organization, focus on the tower determine the location of the exhaust fraction of argon, and to improve the internal structure to ensure that the quality and argon distillate Stability; supporting single thermal equipment, the design of the structure optimization; using company-specific tower design and manufacturing technology, strict control tower, under the tower, crude argon column, refined argon column of the manufacturing quality of air separation equipment and computer control Optimization technology applications in place. Carefully selected by the various systems related to various types of valves, orifice, the analyzer measures to ensure the accuracy of adjustment; PDMS works with the software, CERSAR-Ⅱ stress analysis software applications and development to ensure that the pipeline system stress fractionating tower Compensation of security.
Yellow River source of air separation from design to manufacturing process for each procedure is strict quality control, and constantly practice and improve, improve, finally received the good results. At present, the company developed the design and manufacture air separation plant with argon product line has formed, KDON-3800/4000 type, KDON-4500/4500 type, KDON-6000/6000 type, KDON-10000/10000 type, KDON-12000 / 12000 type, KDON-15000/15000 air separation plant have been normal for transportation, argon and purity of the output of products have reached or exceeded design requirements, complete sets of equipment shipped to the success rate of 100%, stable leading domestic level. Jiangyin Huaxi Gas Limited 12,000 ASU a successful drive, the Yellow River for the Group-wide air-distillation system argon ASU series added wonderful work.
KDON-12000/21000/420 air separation plant of the Yellow River Group for an air separation Huaxi Village in Jiangyin City, Di Wutao ASU. On June 1, 2007 to start the installation, January 24, 2008 a successful test, April 6, 2008 successfully passed appraisal, the performance index reached the superior design specifications. Specific operating parameters as follows:
Project design value of the actual operation
Oxygen production (Nm3 / h) 12000 12400
Oxygen purity (%) 99.6 99.7
Liquid oxygen production (Nm3 / h) 200 300
Liquid oxygen purity (%) 99.6 99.7
Nitrogen production (Nm3 / h) 21000 22900
Nitrogen purity 10x10-6O2 2.7x10-6O2
Output of liquid argon (Nm3 / h) 420 470
Liquid argon purity 2x10-6O2 3x10-6N2 0.9x10-6O2 2.7x10-6N2
1. Process programme:
This device used molecular sieve at room temperature adsorption-purification, with pressurized Turboexpander the entire process of low pressure air separation plant. Use of structured packing on the tower, the entire distillation system argon, oxygen, nitrogen products compression process. DCS air separation package used computer control.
2. Main supporting units and equipment characteristics:
2.1 raw materials air filters and air compressors: supporting self-cleaning air filters, air compressor capacity by inhalation of 1.8 times the state gas configuration. Domestic centrifugal air compressors, rated displacement 63000 Nm3 / h; rated exhaust pressure 0.52 MPa, four compressed three cooling, electrical drag, double layout, shaft power 5565 KW, supporting the electrical power of 6200 KW, load regulation of the 75-105%. DCS Master Control Room control.
2.2 air pre-cooling system: the system set up air-cooling and cleaning the cooling towers of air, water cooling towers will be used evaporation recycled water cooling effect of pre-cooling, as the air separation plant extract a large quantity of nitrogen, pre-cooling system needs additional cold source, set Lo Leveraged chiller. Chilled water pumps, water pumps at room temperature selected China-made brand-name products. The system also provides for expansion after the booster unit for chilled water cooler.
Air cooling towers, water cooling towers are using a specially designed high efficiency, scattered pile packed tower, the actual operating results show the full effect of heat transfer, and resistance loss on the merits. Air-cooling tower of frozen water on the 34 t / h, under normal temperature of the water 113 t / h; cold water temperature of 6.7 ℃, the temperature of air to air-cooling towers 7.7 ℃, chilled water and air temperature only 1 ℃, chilled water consumption of only 5.3 million cubic meters of air Tons. The system of air pressure drop 4 KPa. Air-cooled water tower mechanical calculation gas velocity of the air tower in the security restrictions within the framework of a large distribution of liquid flux, setting severe subsidence + screen separation devices in addition to Mo soft drinks, soft drinks from good effect, ensuring the safe operation of purification systems.
2.3 purification system: Vertical single bed adsorption zeolite, renewable heating electric heater, heating and cooling winds adopt the same first-class roads, sewage system with nitrogen into the butterfly valve regulating the flow control and purification for a constant flow of regeneration process to ensure that the fractionation Tap Tap system stable condition. With sufficient and constant pressure to complete control process to ensure that fractionating tower system into the air pressure stable. The system processes as shown below. Adsorption bed immediately so that the geometry of the effective distribution of air currents, adsorption high efficiency and CO2 content of the air system to design value 1 x10-6, run value of 0.37 x10-6, for purification system-wide running resistance ≤ 10 KPa, this is because of vertical Bed by 13 X-APG, 4X8 head of the molecular sieve specifications, absorption capacity and resistance to control each other. Vertical than horizontal bed adsorption bed high-quality areas the proportion of small, less absorbent filling, renewable airflow distribution, the bed cross-section of relatively uniform temperature gradient, renewable energy consumption low. This system operated electric heater Power 600 KW, the average consumption of renewable power of 250 KW.
2.4 fractionating tower system: the system is the core of an air separation plant, the actual operating results, the distillation tower oxygen extraction rate of 99.2 percent, the extraction rate of more than argon 81%. Air into the cold pressure Box 0.48 MPa, air compressor discharge pressure 0.494 MPa. Domestic indicators in the entire series of low pressure air separation plant in the lead level. The main heat exchanger system using oxygen, nitrogen, nitrogen pollution at-home, five combinations. Hot temperature in its operation within the 2.6 ℃. Too cold for two and a tower on the nitrogen, nitrogen pollution of air and a cold liquid nitrogen, liquid nitrogen guarantee the priority of the cold. Turboexpander pressure group run stability, expansion of insulation efficiency of 85 percent, after the booster for the efficient use of cooler finned tube, chilled water and pressurized air from the temperature only 1.1 ℃. Two-overflow convection sieve under the tower; regular packing on the tower; single boiling condensate evaporator; crude argon column two towers set up, connecting with the hydraulic pump imports; fine argon column feed gas, reflux condenser; part of argon, compressed To 3.0 MPa, provided to users for Argon. System is simple, stable condition. The tower resistance 14 KPa, on the tower resistance 3.9 KPa, argon-argon fraction of 10 percent, crude argon column two towers resistance 10.3 KPa, argon flow of 480 Nm3 / h out of history can now straight. System with the overall layout of the PDMS works with software design, CEASAR-Ⅱ do piping stress analysis. The cold me not run cold frost phenomenon.
2.5 products oxygen, nitrogen compression system: the air separation industry Kaifeng 40 tempering of vertical oil-free piston oxygen, nitrogen compressors. After the Yellow River Group air separation unit in recent years in every part of the Diaozao upgrading units running smoothly, when the exhaust pressure of 3.0 MPa, the volume ratio can reach 0.165 KWH/Nm3O2. According to JB/T6893 "Reciprocating pressure in the oxygen compressor technical conditions" under the volume ratio to 0.2 KWH/Nm3O2. Unit energy consumption decreased 17.5 percent. Domestic oxygen than the turbine compressors more obvious energy-saving advantages. Unit noise, vibration and other indicators are below the standard requirements. The major vulnerability of the replacement cycle is greater than 4000 h, host operating cycle more than one year.
2.6-green space: the creation of "green air separation" will not only substantially increase their production costs and lower profit margins, but most likely in the longer period of time, access to social and public recognition. However, for an unshirkable responsibility, we adhere to in silence. First of all energy-saving has become a "green air separation" the most important point assessment standards and high levels of oxygen, nitrogen and argon extraction rate of equipment will greatly reduce energy consumption. This set of equipment oxygen in the assessment unit energy consumption of 0.38 Kw.h/m3.O2, far below the JB/T8693-1998 "large and medium-sized air separation equipment" provided the oxygen unit energy consumption of 0.45 Kw.h/m3.O2. Strictly control the flow through the pipeline, increased noise insulation thickness, the region will plant noise control standards within the class Ⅲ, operation and management staff have a good working environment.
3. Users and suppliers of harmonious cooperation: ASU dependent on the design level of manufacturing quality; supporting the Ministry of Machine, valves and accessories; installation of four links debug the organic unity. Users and suppliers of harmonious cooperation is an air separation plant and stable operation of the guarantee. Jiangyin Huaxi Gas Company Limited, a number of superb techniques of technology, equipment, electrical, instrumentation, engineers and technicians. Company leaders are running an air separation plant experts. ASU contract negotiations, design review, the Commissioner of them all participate in the installation, commissioning device drivers is their excellent completed. Design review them made a lot of valuable advice. Engineering is on several times, resulting in project layout simple, reasonable and convenient operation, material savings. The installation of the equipment monitoring the entire process, both nuanced and focused, equipment installation quality and integrated harmonious progress of the project. ASU package from the start the installation to commissioning success in just less than seven months time.
