Iron and Steel Company in Liaoning Northern Taiwan 50000m / h air separation plant is currently the
My own design and manufacture complete sets of the largest air separation unit, the set of empty
In addition to using molecular sieve purification separation plant pressurized flow, structured packing tower and the
All distillation system, argon and other advanced technologies, but also used liquid oxygen from the pressurized Technology
Operation, with load variation range, the liquid high yield characteristics. In
L8 day in January 2003 signed a contract June 15, 2004 the official
Operational.
1 50000m / h air separation equipment, key performance indicators
Northern Taiwan Steel 50000m / h air separation plant contract targets
Value not only to meet the iron and steel company, one phase of the project the need for iron and steel production, but also
Iron and Steel Company to meet the needs of the second phase of production chemicals, so the
In conditions are special requirements are also very strict. Package of equipment used
The modular design of reliable software, by a large number of simulation, optimization-based
Work out the most reasonable process, in order to complete the development of an air separation plant success,
Has laid a solid foundation. Table 1, Table 2 lists the contracts were
Performance indicators and 50% of the load performance.
Table 1 The contract provided for performance indicators
Design value of a cold box compression
Output pressure medium pressure Purity
/ (M / h) / MPa (G)] / [MPa (G)]
Pressure of oxygen 50D00 0.05 3.5 99.6% O,
LOX 200o 0.05, 99.6% o1
Nitrogen gas 6Ooo0 0 30000m / h. 2.5MPa
. 008 ≤ 10 X 10 1 02
27500m3 / h
. O. 08MPa
Liquid nitrogen 24oo 0.47, ≤ 10 × 10 1 O2
Liquid argon 1400 0 ≤ 2 × 10 1 02
. 190
≤ 3 × 10 1 N2,
Two air separation unit process
Northern Taiwan Iron and Steel Company 50000m3 / h air separation plant processes the organization
And the overall design, experienced a number of repeated and modified to finalize the
The current program.
Layout of the land on the tower, using flow pump, will be on the tower at the bottom of the liquid
Table 2 Calculation of 50% load performance index
Design value of a cold box compression
Output pressure medium pressure Purity
/ (/ H) / 【MPa (G)] / [MPa (c)]
Pressure of oxygen 25900 O. 05 3.5 99.6% O,
Liquid oxygen 3o0 O. o5, 99.6% O,
Gas N 25800 O 1 In / h. 2.5MPa
. o08 ≤ 10 x 10 1 O2
- M / h. 0.08MPa
Liquid nitrogen O 0.47, ≤ 10 x 10 1 O2
≤ 2 x 10 1 O2
Liquid Argon 735 O. 190
≤ 3 x 10 1 N2
Body hit the upper part of the main condenser. This relatively new process, especially in the
"30000", "50000" level of large-scale air separation unit, the domestic is still
The first time. This overall design, making the height of the cold box greatly reduced
Low, from 70 ~ 80m, look down more than 50 m, liquid air, liquid nitrogen
Starting from the next hit on the tower to the height of tower is no longer a problem, but also benefits
On the set of the stable operation of an air separation plant. On the large flow of liquid oxygen pumps
Said that in the domestic application of air separation equipment is also breaking new ground, special
Another is its control and operation, it is a major problem. Supporting
More stable operation of liquid oxygen pump, the pump with an incubator and the necessary
Instrumented and control, run cold is relatively small. Set of two pumps,
1 with a prepared. Figure l is 50000m / h air separation plant flow chart.
Figure 1 Iron and Steel Company Northern Taiwan 50000m3 / h air separation plant flow diagram
Factory
3 equipment design and equipment features
Air separation unit process organization, process calculation, overall design,
Determines the set of air separation equipment performance and features, of course, good air
Separation plant also need to have excellent manufacturing, excellent installation and a high level of
Operation.
3.1 Flexible working condition variable capacity
The sets of air separation plants requires not only high-load conditions, but also to
To have a stable low-load conditions, its range of load changes
50% ~ 105%, 50% is to ensure working conditions. Therefore, the design of towers
And calculation of particular precision. Under the tower using structured packing, its tower diameter
And resistance in line with the low load and high load of stable operation of the
Requirements.
On the other hand, the next tower using structured packing, their resistance is also suitable
When the smaller, to reduce the emission pressure air compressor to reduce the empty set of grouped
Prepared in terms of energy consumption, there are many advantages.
Judging from the actual operation, the next tower with packed tower, its
Operating flexibility is indeed a big, satisfying the semi-load production.
3.2 high output pressure of oxygen
According to Northern Taiwan Steel production needs, the product of oxygen out of the cold
Box pressure is 0.05MPa (G), so use of liquid oxygen from the pressurized flow
Process is necessary and economical. Only in this way, the product of oxygen through the oxygen turbine
Press compressed in order to achieve 3.5MPa (G) pressure, and then
Pipe network to send the output. Since the pressurized liquid oxygen using horizontal, double-team, full-immersion
Type liquid oxygen evaporator, whose main feature is a small temperature difference, heat load large.
In addition, the design calculations, considering the full evaporation margin.
Liquid production capacity of 3.3 Great
Reaching 50000m / h of oxygen production at the same time, but also as far as possible
Multi-property fluid, which is the user's needs is air separation equipment manufacturing
Plant's wishes. To some extent, also reflects the air separation plant
Excellent performance. The production of liquid air separation plant are: liquid oxygen
2000m3/tl
, Liquid nitrogen 2400m / h, liquid argon 1400m3 / h. The mesh
Pre-operation point of view, this set of air separation equipment, liquid production capacity of major.
3.4 The placement of the primary heat exchanger
The main heat exchanger placed in the set of the overall layout of an air separation plant
, Also became a key message. With a reasonable resistance will be more
Optimized set of the overall performance of an air separation plant. In addition, in order to boost
Air can get the full heat exchanger, the sets of air separation plant outside in the cold box
The addition of three pressurized air heat exchanger, in order to meet the needs of working conditions.
3.5 crude argon condenser design and control
Air separation plant operating conditions and stability is the most important, part of the system, in particular argon
To highlight the. To make the system part of the operating conditions of argon stable, non-occurrence of "nitrogen
Cypriot, "processes is a fundamental basis for the calculation, so that both fractions
Distribution is reasonable, I have to draw accurate, the rest is the unit of equipment
Design and operation among the operations. In the process to request the crude argon condenser
Slightly higher level of Air Liquide, Air Liquide steam in the pipe back to the tower placed in the way
Large diameter butterfly valve, conscious control of the crude argon condenser temperature difference, both
So that a sufficient number of argon fraction, but also make Argon system running a stable condition.
3.6 double-slit-type use of the main cold
North Taiwan Steel 50000m '/ h air separation plant using liquid oxygen
Since the pressurization process, liquid oxygen into the liquid oxygen evaporator, evaporation, at the same time
But also output 2000m / h of liquid oxygen products, the overall design has taken on the
Used the double-slit-type main condenser evaporator, so it appears its main Cold
Particularly small and compact. Novel use of the main condenser, an increase of heat-transfer surface
Product, reducing the operation of the main cold surface, reducing the full set of air separation plants
The energy consumption.
Crude Refining gradually from 3.7 to
In China, the air separation plant 50 years since the 20th century, developed into this
Days and, generally speaking, produces a comparatively thick, and air separation plant that
The design level, the level of an air separation plant, air separation equipment, the manufacture of water -
Peace manufacturing capacity has a very close relationship.
This secondary to create "50000" class air separation unit, the situation is
Is different. The design, manufacture should be fine, compact, and produce air separation
Equipment, fine. Equipment, computing, manufacturing, pipe layout calculation
Is the difficulty lies with the small class compared to different air separation unit.
3.8 Since the safety of pressurized flow
While the current domestic internal compression process and liquid oxygen from the pressurized flow
The security analysis, has not formally on the agenda, nor did
To formulate a formal standard, but for such a large air separation plants
For its security issues, has long been reflected in the design. It
A key component of the safety of the main condenser from the evaporator, transferred to the liquid oxygen
, Or some other parts of the evaporator. For this point to consider, in addition to liquid oxygen
Evaporator equipped with the safety of liquid oxygen emissions, their respective valve is to use a special
Materials, special manufacturing process.
50000m / h levels of air separation equipment, the design of the device
To ensure that everything goes, whether it is on the selection of material, or material
The thickness and stiffness, are up to improve a grade. Can 5083
High-strength aluminum on the best use of 5083 high-strength aluminum, stainless steel can be used
Steel, stainless steel wherever possible. Cold box basically did not see a
~ 30mm × 2.5mm below the aluminum tubes, but also do not see the past, thin-walled
Aluminum tubes, thereby enhancing the entire air separation plant security.
Because the land layout on the tower, cold box height fell to more than 50 m,
Caused by the cold temperature inside the device, pipe deformation reduced,
Significantly reduced the possibility of its destruction, which put an end to the cold box for the future
Leakage, to ensure the safety of good.
3.9 Instrument Control System Features
Industrial control systems using advanced control technology to realize the
Control, machine next to the control of local integration, which can effectively monitor the entire
Air separation plant production process. Complete control system with advanced design,
Reliable, and high cost performance.
4 commissioning and operation of
Northern Taiwan Steel 50000m '/ h air separation plant into a car
Power, stable operation, has now entered a semi-load of produce, good indicators
好. Complete air separation plant in operation, resistance to various aspects of small, there is
A large potential, which is running at full capacity for the future quite favorable.
Northern Taiwan Iron and Steel Company 50000m3 / h air separation plant can be debug
That is quite smooth, in June 2004 to start expansion machine 1 Et
Bare cold, June 11 that the official car. Running process, from the
Evaporator at the location of high and low oxygen more freely associate, oxygen pressure just
To meet the design point.
5 Conclusion
Iron and Steel Group, North Taiwan, "15" added to the program four key project
One - 50o00m / h air separation plant on June 15, 2004
Be completed and commissioned for the Northern steel to achieve target of quadrupling the total economic output and laid a
Foundation.
50000m / h air separation plant under the North Taiwan Iron and Steel Company's 1
Engineering needs, was June 13, 2004 launch into the semi-negative
Dutch operation, all the indices are good, and the network has produced. This is a
Objective success of the early Benxi revitalization of enterprise starting point to open
Bureau, the leap-forward development goals, opened a good start, and greater development for the future
Laid the foundation.
Northern Taiwan Iron and Steel Company to be the second phase was completed in 2005, the
Complete air separation plant will be put into operation at full capacity. The air separation plant-shun
Lee Hang oxygen production marks the large air separation plants in the design and manufacture of
Has made new progress.
"20000" level air separation plant in 2002, successfully developed from the
This is only a short period of two years time, is now China's iron and steel, petrochemicals
※ ※
Areas such as the main army. Hangyang far as is concerned, has been designed, the system
Made (or are in the design, manufacturing) and "20000" level of air grouped
With as many as 40 sets. The "50000" class air separation unit 2004
Years of successful development, is currently Hang five sets of oxygen had been awarded the rating of air separation
Equipment manufacturing contract. We are convinced that sooner rather than later, made the "five
Million "level of air separation plant will gradually occupy the domestic market.