Mountain compressed air pipeline process design research Wang Lifeng flow, from the energy input energy transfer energy output introduced the specific method of compressed air pipeline process design to guide practice.
1 Overview In the section of the machine, the pneumatic tool purging equipment and the brake test air use compressed air. The compressed air pipeline process design is an important part of the engineering design of the railway section. The energy flow is a systematic method to study the energy of nature. The general law of transmission, universality and objectivity. The systemic energy flow method is used to study the process design of compressed air pipelines. From general to specific, from essence to phenomenon, it has more guiding significance and can study engineering technology more comprehensively and rationally. law.
2 Systematic energy flow According to the theory of dissipative structure and system theory, all parts of the system are in a state of constant flow, and the flow in it refers to the information flow of energy flow material flow, etc., the system must be updated continuously, the system must It is an important flow to extract material and energy from the surrounding environment while discharging its own products out of the system to maintain its steady state. The energy flow mainly includes the transmission and transformation of energy. In engineering design, it adopts Reasonable process design reduces the dissipation of energy, so that the energy from the source to the machine energy flow can be divided into energy input energy transfer energy output. For the compressed air pipeline system, the corresponding air-point between the indoor and outdoor pipelines of the air compressor is 2.1. The energy input between the air compressors refers to the air compressor room that provides compressed air. Its function is to provide reliable quality compression. Air compressors are installed in the air compressor room. For some high-precision equipment, oil-free and dust-free compressed air is required. The compressed air needs to be dried and purified to achieve the dryness and purity of the user. The air compressor room is equipped with a cooler dryer air tank. The engineering design content mainly considers the aspects of the general layout equipment selection and civil construction requirements, and the overall layout. 1. Close to the gas load center. 1. Power supply and water supply is reasonable.
Avoid the proximity to places where explosive and corrosive and toxic gases and dusts are emitted, and the distance between the leeward side air compressors and the places with noisy vibration protection requirements at the minimum frequency of the annual wind direction in the above-mentioned places shall comply with the relevant national standards. The provisions of the specification, 6. The orientation of the air compressor should be such that there is good natural ventilation between the machines. 1. When the air compressor room is adjacent to or located in other buildings, it should be separated by a wall. Arranged by the external wall, the air compressor installed in the multi-storey building should be arranged in the bottom equipment selection. The pressure requirement of the air compressor in the machine section is less than 0.8. The air compressor is like 1; or 2,1; 2 master and backup, or 4 master and backup.
Civil engineering requirements, the air compressor design of the air compressor is relatively simple, according to the design specifications of the compressed air station of 06 50022003 and the relevant specifications of the engine vehicle, which mainly involves the air conditioning of the room layout, the opening of the door, the setting of the outdoor pool, the water cooling, the energy transfer of the energy transfer pipeline, and the energy transfer. It refers to the indoor and outdoor arrangement of the pipeline. It is the most important part of the pipeline process design. It is the connection between the air compressor and the gas point. Its function is to achieve low energy consumption and high efficiency of compressed air. The design mainly considers the following aspects: 1 The energy consumption is small, combined with the position of the air compressor in the total, the outdoor pipe network is arranged, the pipe distance is reduced as much as possible to reduce the angle of the pipe, and the energy consumption is reduced. 2 The cost is low and the pipe diameter is reasonably selected. Pipe, set the pipe direction and slope, reduce the number of related accessories such as oil-water separator casing bracket, and choose a reasonable position to cross the warehouse wall to reduce project investment. 3 process smooth. For outdoor pipelines, pipe laying is used for laying underground or overhead laying. Because overhead laying affects the overall flatness, it is rarely used. The investment in buried laying is low, but it is not easy to overhaul; pipe trenching is opposite to buried laying in the subway. In the depot, most of them are laid in the form of integrated trenches, and the national irons are mostly laid in buried form. In recent years, with the overall improvement of engineering design, and in order to facilitate the routine maintenance of operating units, more and more machine sections are laid by pipe trenches. The layout of the pipeline outside the warehouse mainly considers the elevation of the pipeline and the avoidance of other pipelines. The oil-water separator is installed at the entrance of the warehouse; the casing entrance is directly protected by the casing to bury the wall, and the pipeline and the ground ring beam are verified in the design. The positional relationship indoor pipe mainly considers the longitudinal avoidance of the channel and the inspection of the trench, and avoids the crane in the horizontal and vertical directions. Therefore, it is suspended or buried along the shelf column in the longitudinal direction, and is laid laterally along the wind-resistant column. The wall racks are led down or led out by the underground. If there are more stocks in the warehouse, for example, the 4-line inspection warehouse of the motor car is used. Between the stock roads, it is necessary to install pipe trenches, 4 specifications. Pipe fittings should be installed in pipelines and related accessories such as gate valves should be in accordance with relevant regulations. When laying in the same trench, it should be kept at a fixed distance from other pipelines. The main pipe should be made of seamless steel pipe with a diameter of more than 57, inch. Hot-rolled pipe is often used. When less than 57, cold-drawn tubes are often used. Branch pipes with a diameter less than 32 mm can be selected by low-pressure fluid welding. The diameter of the pipe is not less than 23, and the reverse slope is not less than 39. After the storage, the gate should be provided at the main pipe. A water-oil separator is installed at the end of the pipeline, and 2.3 energy output gas point energy output refers to each gas in the workshop. The design of the gas point is relatively simple, mainly to realize the controllable output of energy, and to arrange the gas equipment reasonably, so as to facilitate the connection of the pipeline. The gas equipment should be arranged near the column or the wall as much as possible so that the pipeline can be taken along the pillar column or underground. . The pipeline at each gas point should be equipped with a shut-off valve. If the gas equipment is more and more concentrated, a distributor should be installed; if the gas pressure is high or a stable wind source is required, a gas tank 3 case analysis should be provided. Chengdu EMU uses a new 4-line inspection library, a temporary repair warehouse and other related facilities. Shanxi construction does not fall into the forging warehouse power cable casing small 1405 3.2 energy conversion pipeline layout l outdoor pipeline. The outdoor pipe is made of seamless steel pipe with a diameter of 89mm and is laid underground. Considering that the power supply and drainage pipelines pass through the front aisle side of the reservoir, the compressed air pipelines are taken out from the air compressors, and the vertical traffic lanes are used to pass through the storage lines before the corners, and then the corners are laid along the side of the strands to connect to the inspection warehouse. This arrangement reduces interference with other pipelines and advances the progress of the construction.
In the design, through the position of the channel, the pipe diameter is 140, the casing protection; the oil-water separator is installed in front of the reservoir, and it is necessary to consider the intersection with the other pipeline warehouse ground ring beam to check the oil-water separation of the reservoir water pipe!
2 indoor pipes. There is one channel and trench in the temporary repair warehouse, and there is a crane. For the convenience of implementation, the outdoor pipeline is buried and inserted into the right side of the reservoir along the right side of the channel. After storage, it is laid along both sides of the warehouse. Reverse slope, lead to a number of branches, for maintenance equipment, which is led along the shelf column to the layer operating platform gas points, to avoid conflict with the crane. Three-dimensional arrangement of the pipeline plane 3, 4.
3.3 Energy output gas point design The gas equipment of the temporary repair library is mainly placed on the ground. Only the layer working platform flap is set at 3.8m above the top of the rail. The pipeline is also arranged on both sides of the warehouse to facilitate connection. 4 Conclusion With the rapid development of China's railway construction, China's railway designers have accumulated a lot of practical experience. The most important lesson in front of designers is how to improve the level of railway engineering design and expand overseas markets. From the perspective of system, we will study various engineering design subsystems and make breakthroughs one by one. We can summarize the results of railway engineering design in China, improve engineering design technology, and prepare for the development of foreign railway engineering market. At present, the design of compressed air pipeline technology is progressing to fine In the direction of development, this paper studies compressed air pipelines from the perspective of systemic energy flow, and combines dimensional design software to improve the design level of compressed air pipelines. Philosophy of Science and Technology, Chengdu Southwest Jiaotong University, 2003.
Ding 8621, 9, high-speed railway design specifications trial 0.
31 Energy input air compressor design The use of motor vehicles is relatively small, mainly inspection warehouse and temporary repair warehouse. In addition, because the inspection workshop does not need test wind, it is only used for power, so the air compressor is equipped with 2 sets of 3 air. Press, 2 gas storage tanks, 1 oil water separator. Air compressor room
After the soil bank enters the integrated pipe ditch, it is necessary to study the elevation of the relevant facilities and reasonably set the pipe elevation so that the pipeline can be smoothly put into storage. Outdoor pipe arrangement 2.
Electric air compressor room casing 6140 parent 5 mammoth air compressor air compressor
A reaction turbine is a type of Steam Turbine that works on the principle that the rotor spins, as the name suggests, from a reaction force rather than an impact or impulse force.
In a reaction turbine there are no nozzles to direct the steam like in the impulse turbine.Instead, the blades that project radially from the outer edge of the rotor are shaped and mounted so that the shape between the blades, created by the cross-section, create the shape of a nozzle. These blades are mounted on the revolving part of the rotor and are called the moving blades.
The fixed blades, which are the same shape as the moving blades, are mounted to the outer casing where the rotor revolves and are set to guide the steam into the moving blades. Below is a simple diagram of reaction turbine blades:
Reaction Turbine Principle:
In the case of reaction turbine, the moving blades of a turbine are shaped in such a way that the steam expands and drops in pressure as it passes through them. As a result of pressure decrease in the moving blade, a reaction force will be produced. This force will make the blades to rotate.
Reaction Turbine Working:
A reaction turbine has rows of fixed blades alternating with rows of moving blades. The steam expands first in the stationary or fixed blades where it gains some velocity as it drops in pressure. Then enters the moving blades where its direction of flow is changed thus producing an impulse force on the moving blades. In addition, however, the steam upon passing through the moving blades, again expands and further drops in pressure giving a reaction force to the blades.
This sequence is repeated as the steam passes through additional rows of fixed and moving blades.
Note that the steam pressure drops across both the fixed and the moving blades while the absolute velocity rises in the fixed blades and drops in the moving blades.
The distinguishing feature of the reaction turbine is the fact that the pressure does drop across the moving blades. In other words, there is a pressure difference between the inlet to the moving blades and the outlet from the moving blades.
Special Aspects of Reaction Turbines
- There is a difference in pressure across the moving blades. The steam will, therefore, tend to leak around the periphery of the blades instead of passing through them. Hence the blade clearances as to maintain as minimum as possible.
- Also, due to the pressure drop across the moving blades, an unbalanced thrust will be developed upon the rotor and some arrangement must be made to balance this.
Reaction Steam Turbine
Shandong Qingneng Power Co., Ltd. , https://www.steamturbine.be