Innovative technology, science and technology innovation, air compressor noise control and ventilation heat dissipation Song Jiping (Xiamen Jiada Environmental Protection Construction Engineering Co., Ltd., Xiamen, Fujian 361009), the layout of air compressor station equipment, calorific value calculation during air compressor operation, air compressor The determination of the cross-sectional area of ​​the inlet and outlet vents of the station and the assumption of the heat recovery of the air compressor are analyzed.
Air compressors are power machinery equipment widely used in factories and mines, which can provide stable airflow with little pressure fluctuation. It has the characteristics of stable rotation and high efficiency. The working gas is compressed, transported and expanded during operation, and low frequency noise dominated by low frequencies is emitted during this process. The noise intensity varies with the working mode, power, working pressure, displacement and speed of the air compressor. The general sound pressure level is 90110dB, which is the main source of industrial noise.
The noise of the air compressor is mainly the intake and exhaust aerodynamic noise and mechanical noise and electromagnetic noise. The noise reduction of the air compressor station mainly adopts the basic anti-vibration, the air inlet and outlet are silenced, the air compressor sound insulation cover or the wall of the enclosure structure is sound-absorbing, the anti-vibration noise reduction of the pipeline, the noise control of the gas storage tank, and the exhaust Measures such as venting noise control. The noise reduction project first requires the tightness of the envelope structure to strictly block the transmission of sound, but it also isolates the way the heat is emitted. The air compressor generates a large amount of heat when compressing the air. The higher the pressure, the larger the gas production and the higher the heat generated. If you do not take this heat away in time, the air compressor will be less efficient, the machine will be shut down, and even equipment damage will occur. In addition to the cooling medium provided by the equipment itself, the cooling of the air compressor should consider the setting of the ventilation and cooling system in the air compressor station. Otherwise, the noise reduction project may be up to standard, the air compressor will not operate normally, and the whole project will fail. This paper mainly describes the particularity of the implementation of the noise reduction project of the air compressor room; 1Setting points of the air compressor station enclosure structure The orientation of the air compressor station should be such that the air compressor and the auxiliary equipment have good natural ventilation. Conditions, especially considering the angle of avoiding summer lighting, the air compressor station's envelope structure should have sufficient space, and the height of the lower layer or beam bottom of the machine room beam of the air compressor station should meet the equipment disassembly and hoisting and ventilation. The requirements, its net height should not be less than 4m, in order to ensure the basic ventilation and heat dissipation conditions of the air compressor station.
For example, if the air compressor station is on the ground, a mantle-type air intake soundproof room can be installed, which is beneficial to reduce the intake air temperature and reduce the entry of harmful gases, or to set the air inlet well, and the air outlet is in a cool and heat-dissipating place. The air inlet is arranged at the lower part of the air compressor station, and the muffling air outlet is arranged at the upper part of the air inlet at the other direction to ensure a reasonable and smooth ventilation system in the air compressor station. According to the principle of rising hot air, low air intake and high air output are achieved. Note that the distance between the inlet and outlet should be separated as much as possible. Do not let the hot air affect the air intake, and ensure that the air temperature around the air compressor in the air compressor station is not higher than 40 °C during the summer high temperature, to ensure the normal operation of the air compressor.
2 Layout of air compressor station equipment The air inlet of the air compressor is at the same angle as the air inlet of the air compressor station, and the distance is as short as possible. There must be a certain width between the air compressor units or between the air compressor and the auxiliary equipment. The passages should be designed in accordance with the requirements of the Design Specification for Compressed Air Stations GB50029-2003.
According to the "Code for Design of Compressed Air Stations" GB50029-2003 and the "Safety Rules and Operating Regulations for Fixed Air Compressors" GB10892-2005, the cooling exhaust duct and the output duct should be wrapped with thermal insulation material to reduce heat radiation. Reduce the temperature rise of indoor air. The support of the exhaust duct on the retaining structure may have an adverse effect on the retaining structure. Therefore, the exhaust duct should use a separate bracket as much as possible. If the pipe is to be supported on the retaining structure, vibration isolating sleeves, spring supports, hangers or components such as rubber gaskets or springs at the pipe and support joints should be used.
3 Calculation of calorific value when the air compressor is running The air compressor converts the energy (electric energy) supplied to it into heat energy while producing compressed air. About 4% of these thermal energy is carried away by compressed air, about 2% of which is radiated through the machine and the pipeline, and most of the heat (about 94%) is transferred to the cooling medium.
3.1 Air-cooled air compressor volumetric flow of cooling air The air-cooled air compressor unit cooling system is a calculation method that uses the air duct to discharge the heat generated by the compressor unit to the outside to determine the cooling air volume. The calculation formula for the amount of cooling air required for the cooling system is as follows: m air cooling = QL air cooling = m air cooling / p = Q: (CpXAtXp): Q - total heat flow (kW) (Q = 94 °% X compressor Shaft power + total compressor power - compressor shaft power); m air-cooled-cooled air mass flow (kg / s); Cp week new details. Noise control and application examples. The ocean horse is big. Noise and Vibration Control Engineering Handbook.
Mechanical Industry Press, 2002 (9).
(Continued from page 16), strict cleaning should be carried out before the glue is filled, to ensure that the previous glue is left as little as possible at the lower end of the wire rod, and that no residue is left on the surface of the wire rod. Clean, do not leave dirt, use alcohol to clean and then use a heat gun to dry. In the assembly process of the stator bar insulation box, the material of the material used for the filler should be qualified, and the material should be prepared according to the ratio requirement within the validity period, and the influence of temperature and humidity should be considered. When filling, it must be filled with compaction to avoid localized extrusion and partial discharge heating. In the preparation of the epoxy resin, in order to solidify, the diluent is used as little or as little as possible.
Insulation is affected by shrinkage and vibration, which can lead to the formation of end defects. The shrinkage of the insulating material tends to cause voids in the filler. The inspection and test of the end should be strengthened for timely detection and treatment; if the end of the stator is to be tied with the soaked glass rope, the application force is uniform and tied; The electrical test work of the ends of the stator bars is used to verify the effect of the repair. If the insulation is broken down, the cause should be found and the glue ratio and watering should be re-executed.
In order to prevent the occurrence of insulation accidents, the work attitude of the person in charge of the work should be improved, and every component of the generator should be carefully checked to ensure that problems are found in time and resolved in time. Of course, it is also necessary to require maintenance personnel to improve the level of maintenance technology, to be responsible for the work, and to give full play to the role of equipment by a special person. Especially for the key components of the main equipment, it should be carefully checked. For the maintenance personnel, to improve the technical level, it is necessary to strengthen the basic management work, carefully analyze the causes of the defects, and recognize the consequences.
5 Conclusion The maintenance of the generator set insulation involves a lot of content, involving a wide range of aspects, involving high-voltage test, electrical and mechanical maintenance, material preparation and other aspects. The 6 insulation boxes at the lower end of the stator of Unit 1 of Manwan Power Plant appeared loose, and were inspected by the experts of Dongfang Electric Machinery Factory. The possibility of analysis was greater. When the unit was installed with insulating boxes, the insulation box used was not carefully cleaned. . In view of the above defects inspection, discovery and treatment, it is required to strengthen the technical quality supervision during the installation process, strictly witness and stop the inspection process, avoid the equipment operation risk, and prevent such unsafe conditions from the source; at the same time, comply with The principle of repairing and repairing must be repaired, strict maintenance of equipment, and in-depth investigation of such situations, to ensure long-term, stable and safe operation of power generation equipment.
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