Many of the candidates focused on the screws and felt that simple structures were sufficient, but once the flow reached hundreds of thousands of nm3/h, the screws could not be carried out efficiently and geographically. Centrifugal compressors are the correct solution to the continuous mass flow, which is also the dominant choice in the empty, petrochemical and hydrogen energy industries, so that the differences in their rationale are understood in order not to be mistaken。
What's wrong with screw theory and centrifugal logic
The screw compressor pushes the gas to export by collating with a yin rotor, which is essentially a volume change, with the maximum flow depending on the size and speed of the rotor, which falls beyond a certain diameter processing accuracy. The centrifugal pattern is completely different, with a high-speed rotation of the leaves that throws the gas out, accumulates the kinetic energy and reduces the pressure in the amplifier, and compresses the process continuously without retroactivity。
In actual production, a million-ton steel plant is empty, with 600,000 nm3/h imported, eight to 10 screwdled, at least 300 square metres, and noise and maintenance are frightening. A centrifugal machine can be covered, with short pipelines, small floors and simple control systems, which are the core advantages of centrifugalism in a large flow scenario。
How do you run phase three compression
The gas enters the wheel first through an imported pilot, which is driven by an electric or a steam engine, turns at a speed exceeding 10,000, and increases dramatically when the gas is thrown out, a step that simply accumulates kinetic energy. Then the high-speed air flow into the amplifier, the flow is gradually widening, and the pressure is brought up at a reduced rate, which is eventually discharged from the export, completes the first-level compression and the entire process is continuous。
A multi-stage centrifuge compressor is equipped with a cooler between the intermediate stages, reducing the temperature of the gas to half the temperature and then down to the lower stage. The gas heats up the repressure efficiency cliff and saves 10 to 15 per cent of total energy consumption by an intermediate cooler. Space-based pressurizers are often associated with cascades of 3 to 5 stages, with cooling occurring between each stage, which is key to the overall efficiency of the machine。
Core widgets compress upper
Leaf wheels are the heart of the whole machine and the materials are used mostly in alloy steel or titanium alloys to process precision to microme. An air pressurizer may have a speed of more than one metre in the diameter of a leaf wheel, with an extremely tight balance. The design of the amplifier directly determines whether the whole machine can run to nominal efficiency by two or three percentage points, and the cost of electricity is hundreds of thousands of dollars a year。
The bearing and sealing systems are also critical. The high-speed rotation equipment is the most vibrating, and once the seal fails, the gas leaks or air inhales, the light is less efficient and the heavy is replaced. The overall gear compressor, with the gear box, allows each of the various stages of the wheel to run at the best speed, more flexible than a single-axis chain, which is the structure for ihi and atlas copco's main machine。
You're a big deal
The 100 000 nm3/h spaced device is a screwdriver, conservatively estimated at 8 to 10 combinations, with electric power and piped roads covering at least 200 square metres, with easy annual maintenance costs of millions. A centrifugal machine is done, 15 to 20 per cent less than power, and the annual savings on electricity are real, as well as a large circle of pipelines and valves。
The maintenance cycle gap is more visible. When the rotor gap of the screw is worn out, the compression is directly reduced, and the replacement is substantially repaired in two to three years. Centrifugal parts are not re-movable and the normal maintenance cycle is drawn to 8,000 to 10,000 hours, and a set of seals or bearings is much cheaper than a screw for rotors, with a shorter stop time and much less impact on continuous production。
Oil-free compression and new energy applications
The nitrogen purity of the semiconductor crystal circle plant is required to reach the ppm level, and the oil molecules are mixed into the entire area. The oil fog in the food-drying environment is not eligible for the entire product. There is no contact with lubricating oil between centrifuges and gases, and there is no natural oil, and it is difficult to achieve this cleanness by oil mist recovery, which is an irreplaceable hard demand scenario for centrifugalism。
Hydrogen energy tracks are also being paved. Hydrogen is subject to electrolytic hydro-hydrogen pressure from two or three atmospheres to more than 70 bar to enter the fuel cell or the pipeline network, which is matched by large centrifugal flows and continuous operation. Sialteko is already working on a centrifugal compression programme for hydrogen and process gases, covering machine upgrades and spare parts replacement for brands such as atlas copco, ihi, etc。
Actual considerations for selection and replacement of spare parts
Many of the old centrifuges were installed in the 1990s, the original plant was shut down or the offer doubled, and oem was just needed. The key is the accuracy of the matching of the wheel and gear box, and the lack of a single thread. The no-sill taco product line covers the empty charger, the nitrogen compressor, the process gas compressor and all types of spare parts, supporting the upgrade of the whole machine and the separate replacement model。
It is not possible for the selected manufacturer to look at the offer alone, depending on the abm report, material injury records and the actual operating time. Each procurement manager should have calculated the amount of an empty-centre pressurizer designed to be between 15 and 20 years old, at an additional 5 per cent of the cost of purchasing in the preceding period, which would have been much less than one less annual stoppage per year。
Is the compressor running now a screw or a centrifugal? If you run over 6,000 hours a year, do you want to recalculate power and annual maintenance? You are welcome to talk about your work, traffic and budget in the comment area, and to say a few words about the collection so that it can be compared with the next selection。
