Opening sequence of air compressor suction dryer for cold dryer

Technical Specification for the Starting Sequence of Compressed Air System Equipment

compressed air system is the core power source of industrial production, and its equipment start-up sequence directly affects the stability and energy efficiency of the system. The standard start sequence and operation specifications of the cold dryer, air compressor and suction dryer are as follows:

1. Standard Startup Sequence
according to the equipment working principle and system protection requirements, the "three-stage" start-up process is recommended:

1. the first stage: air compressor pre-start

• pre-start conditions: confirm that the cooling water system (water-cooled model) or cooling fan (air-cooled model) has been operating normally
• operation steps:
  ① Disconnect the connecting valve of air compressor and post-treatment equipment
  ② Start the air compressor, no-load operation for 5-10 minutes
  ③ Observe the exhaust temperature to ensure that it is stable within the range of 60-70 ℃

2. the second stage: cold dryer input

• pre-start conditions: stable air source has been established for the air compressor, and the pressure is ≥ 0.4MPa
• operation steps:
  ① Turn on the power supply of the cold dryer and start the refrigeration compressor
  ② Observe the evaporation pressure gauge and confirm that it is within the range of 0.3-0.5MPa
  ③ When the refrigerant high pressure gauge shows 1.2-1.6MPa, gradually open the intake valve

3. the third stage: suction dryer loading

• pre-conditions for start-up: outlet temperature of cold dryer ≤ 35 ℃, pressure dew point ≤ 2 ℃
• operation steps:
  ① Turn on the power supply of the suction dryer and start the regenerative heating system
  ② Observe the pressure of the regeneration tower and confirm that the adsorption starts when ≤ 0.05MPa
  ③ Slowly open the bypass valve to realize seamless switching to working mode

2. equipment protection mechanism

1. air compressor protection

• delayed start: Set 15 seconds pre-lubrication time to ensure that the bearing is fully lubricated
• pressure buffer: maintain the system pressure above 0.3MPa through the minimum pressure valve
• temperature monitoring: automatic shutdown protection when exhaust temperature exceeds 105 ℃

2. cold dryer protection

• anti-liquid impact protection: set 3 minutes delay start, avoid compressor with liquid start
• high and low pressure protection: automatic shutdown when high pressure exceeds 2.0MPa or low pressure is lower than 0.2MPa
• condensate water discharge: equipped with electronic drain valve, automatic blowdown once every 10 minutes

3. dryer protection

• regeneration protection: Set a 15-minute regeneration cycle to ensure that the adsorbent is fully activated
• differential pressure protection: trigger an alarm when the inlet and outlet pressure exceeds 0.1MPa
• temperature monitoring: automatically cut off the heating power supply when the regeneration temperature exceeds 180 ℃

3. special working conditions

1. low temperature start:

• when the ambient temperature is less than 5 ℃, the air compressor shall be equipped with an oil heater and preheated 2 hours in advance.
• The cold dryer needs to be replaced with low-temperature refrigerant to ensure normal startup at -10 ℃.

2. Long-term shutdown and restart:

• air compressor: replace lubricating oil, manual turning for more than 5 turns
• cold dryer: vacuum drying for 24 hours
• dryer: Replace all adsorbents and perform three complete regeneration cycles

key points of 4. operation monitoring

1. parameter record:

• record the exhaust temperature of the air compressor, the evaporation pressure of the cold dryer and the regeneration temperature of the suction dryer every hour.
• Generate daily pressure-flow curves to analyze system energy efficiency

2. exception handling:

• when the pressure fluctuation is> 0.05MPa, check the pipe network leakage and valve opening
• when the dew point temperature is> 3 ℃, switch the standby cold dryer immediately
• when the drying agent has a service life of 5 years, it must be replaced as a whole

enterprises should establish compressed air system standardized operating procedures, combined with GB/T 13277 "compressed air" standard, the development of exclusive equipment management standards. It is recommended to conduct a system linkage test once a month, focusing on key indicators such as equipment response speed (≤ 5 seconds), pressure stability (≤ ± 0.02MPa), dew point temperature (≤-20 ℃), etc., to continuously optimize system operation quality and ensure production continuity.