Oil-free air compressor should pay attention to the requirements and conditions

There are some necessary conditions for the installation of the air compressor, and it is necessary to avoid problems as much as possible.

Air compressor is the basic product of industrial modernization. To know, air compressor is widely used in various fields of major manufacturing industries, in order to better play the role of air compressor, in the early installation work also need strict requirements, otherwise it will cause a lot of problems in the future operation process.

1. Stay away from flammable, explosive, corrosive chemicals and harmful unsafe items; avoid being close to places that emit dust. If the factory environment is poor and there is more dust, pre-filtering equipment must be installed.

The site should be well ventilated and clean air, and must not be installed near high-temperature equipment, which will affect the normal operation of the unit.

3. When the air compressor is installed, it should be built on a flat hard floor. And reserved space, air compressor and the wall must have at least 70cm above the distance, from the top of the space distance of at least one meter above.

4. When piping the main pipeline, the pipeline must be slightly inclined so that the condensed water in the pipeline can be discharged. The pressure of the piping shall not exceed 5% of the set pressure of the compressor, so it is best to choose a larger pipe diameter when piping.

The use of elbows and various valves should be minimized in the pipeline to reduce pressure loss. When reducing or enlarging the pipeline, it must be matched with the reducer, otherwise it is easy to increase the loss due to the increase of pressure, and even affect the service life of the pipeline.

Specific parts: 1. Screw air compressor 2. Front air storage tank 3. Front filter 4. Freeze dryer 5. Precision filter 6. Ultra-precision filter 7. Rear air storage tank.

2. air compressor installation matters needing attention

1. Selection of installation site

the selection of the installation site of the air compressor is the most neglected by the staff. Often, the air compressor will find a place at will after purchase and will be used immediately after piping. There is no prior planning at all. However, such a hasty result has resulted in the failure of the air compressor in the future, difficult maintenance and poor air quality. Therefore, the proper installation site is a prerequisite for the correct use of the air compressor system.

(1) Choose a wide place with good lighting to facilitate the space and lighting required for operation, maintenance and repair.

(2) Choose a place with low air humidity, less dust, fresh air and good ventilation to avoid water mist, acid mist, oil mist, dust and multi-fiber environment.

(3) According to the requirements of the GB50029-2003 Code for Design of Compressed Air Stations, the heating temperature in the machine room of the compressed air station should not be lower than 15 ℃, and the temperature in the machine room during non-working hours should not be lower than 5 ℃.

(4) When the air compressor suction port or unit cooling air suction port is located indoors, the indoor ambient temperature should not be greater than 40 ℃.

(5) If the factory environment is poor and dusty, pre-filtering equipment must be installed to ensure the service life of the air compressor system parts.

(6) When a single compressed air station with a displacement equal to or greater than 20m 3/min and a total installation capacity equal to or greater than 60 m 3/min, it is appropriate to set up lifting equipment for maintenance, and its lifting capacity shall be determined according to the heaviest part of the air compressor unit.

(7) Reserve passage and maintenance space. According to the requirements of the GB50029-2003 Design Specification for Compressed Air Station, the width of the passage between the air compressor unit and the wall shall be 0.8~1.5m according to the displacement.

2. Matters needing attention in compressed air pipeline

(1) When piping the main pipeline, the pipeline must have an inclination of 1 ° ~ 2 ° to facilitate the discharge of condensed water in the pipeline.

(2) The pressure drop of the piping shall not exceed 5% of the service pressure of the air compressor, so it is better to choose the piping larger than the design value. The calculation formula is as follows:

pipe diameter calculation d = mm = mm

where Q pressure-flow rate of compressed air in pipeline m3/min

v-velocity of compressed air in pipeline m/s

Q from-air compressor nameplate scalar m3/min

P exhaust-air compressor exhaust absolute pressure bar (equal to air compressor exhaust pressure plus 1 atm)

(3) The branch pipeline must be connected from the top of the main pipeline to prevent the condensate in the main pipeline from flowing down to the working machine or back to the air compressor.

(4) Do not arbitrarily reduce or enlarge the pipeline. The pipeline needs to use a tapered tube. If the tapered tube is not used, there will be a spoiler at the joint, which will cause a large pressure drop and adversely affect the life of the pipeline.

(5) If there are purification buffer equipment such as air storage tank and dryer after the air compressor, the ideal piping sequence should be air compressor + air storage tank + dryer. The gas tank can be partially cold.

Condensate filtration, but also has the function of reducing gas temperature. The lower temperature and less water content of compressed air re-introduced into the dryer, the dryer load can be reduced.

(6) If the amount of air used is very large and the time is very short, it is best to install another air storage tank as a buffer, which can reduce the number of times the air compressor is loaded and discharged, and has great benefits to the service life of the air compressor.

(7) Minimize the use of elbows and various valves in the pipeline.

(8) The ideal piping is that the main pipeline surrounds the entire plant, so that compressed air in both directions can be obtained at any position. For example, when the gas consumption of a branch line suddenly increases,

pressure drop can be reduced. In addition, in the ring main line should be equipped with appropriate valve set, in order to facilitate the maintenance of the cut-off.

(9) When the air output pipelines of multiple air compressors are connected in parallel, the air compressor output does not need to be equipped with a check valve.

3. Foundation of air compressor

the foundation of the air compressor should be built on hard soil, and the foundation level should be leveled before installation to avoid vibration. If it is installed upstairs, anti-vibration measures must be taken, otherwise the vibration will be transmitted to the downstairs or resonance will occur, which will easily cause harm to the air compressor and the building. Generally, the vibration speed of the screw air compressor is below 11.2 mm/s (belt drive) and 7.1mm mm/s (coupling drive). No special discussion can be made to build a platform foundation with a height of about 120mm and a length and width slightly larger than the bottom area of the air compressor to facilitate sewage discharge.

4. Cooling system

the water quality standard of cooling water for water-cooled air compressor shall comply with GB5005 Code for Design of Industrial Circulating Cooling Water Treatment. When there is softened water available within the enterprise and the system is economical and reasonable, the circulating water in the system can be softened water.

It is mainly to avoid the calcium and magnesium plasma in the water from the chemical reaction due to the high temperature in the cooler, and finally form scale in the cooler, thus affecting the cooling efficiency of the cooler. The water pressure of cooling water is generally between 0.15 ~ 0.4MPa, and the outlet temperature of cooling water should be kept between 6 ℃ ~ 10 ℃ greater than the inlet temperature. The cooling water inlet pipeline should be equipped with filter screen, and the inlet and outlet pipelines should be equipped with pressure gauge, thermometer and stop valve respectively.

Air-cooled air compressor must pay attention to its ventilation environment, the air compressor shall not be placed in the vicinity of high temperature machinery or poorly ventilated enclosed space, so as not to cause high temperature exhaust and shutdown. If it is placed in a closed space, it must be equipped with air inlet and exhaust equipment. The air inlet is located in the lower part of the machine room, and the air outlet is located in the upper part of the machine room to facilitate the circulation of cold air. Generally speaking, the intake and exhaust air volume must be greater than the air compressor heat dissipation and exhaust air volume.

5. Power system air compressor power distribution, must ensure the correctness of the power supply voltage

according to the power of the air compressor used, choose the correct power line diameter, do not use a small power line, otherwise the power line will be burned due to high load and high temperature. The power line shall be a multi-strand copper core cable, with one phase of the three-phase four-wire system as the ground wire. It is best to use a set of power system alone, especially to avoid parallel use with other large power consumption systems, otherwise it may be due to excessive voltage drop or three-phase current imbalance, which may cause the main motor of the air compressor overload and shutdown, high-power air compressor should pay special attention.

And the power supply network load should be uniform, the voltage fluctuation is within 5%, and the three-phase voltage imbalance is allowed to be within 1%. There can be no connection point between the power distribution cabinet and the power supply cable of the air compressor. Select the appropriate air switch according to the power of the air compressor to maintain the safety of the power system and maintenance. The grounding wire of the power system shall be securely erected, and the grounding wire shall not be directly connected to the compressed air supply pipe or the cooling water pipe.