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Centrifugal Compressor Turbine Compressor Circulating Supercharger Nitrogen Compression and Expansion Machine

Le Bo Engineering (Hangzhou) Co., Ltd. Verified Business License
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Negotiable MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
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Material:
Carbon Steel
Type:
Multiaxial Type
Warranty:
one year
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Payment & Shipping
Payment Methods:
Port of Shipment:
Port of Shanghai NingBo port
Delivery Detail:
100 days

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Material Carbon Steel
Type Multiaxial Type
Warranty one year
Lubrication Style Lubricated
Cooling System Water Cooling
After-sales Service 24 hours or 72 hours
Mute Not Mute
Impeller Semi-Closed
Transport Package wooden box/trunk
Origin China
I. Core Selection Requirements (Ranked by Priority)
1. Basic Process Requirements (Prerequisite for Selection)

  • Confirmation of Medium Characteristics (directly determines material and structure)

    • Medium types: Air, natural gas, syngas (H₂/CO), steam, corrosive gases (e.g., chlorine, ammonia), etc.;

    • Key properties:

✅ Flammability and explosiveness (e.g., methane, hydrogen require explosion-proof design, motor protection class ≥ Ex d IIB T4);
✅ Corrosiveness (e.g., acidic gases require corrosion-resistant materials such as Hastelloy, duplex stainless steel);
✅ Impurity content (dust/liquid droplets require pre-filtration system, solid particles ≤ 5μm, liquid content ≤ 0.1kg/m³);
✅ Viscosity/compressibility (low-molecular-weight gases such as hydrogen require optimized impeller design to avoid efficiency loss).

  • Flow and Pressure Parameters (Core Performance Indicators)

    • Flow requirement: Clearly specify standard condition flow rate (Nm³/h, 0℃/101.3kPa) or operating condition flow rate (m³/h, actual inlet temperature/pressure), with deviation ≤ ±5% (to avoid overload or capacity waste);

    • Pressure requirement:

✅ Rated discharge pressure (absolute pressure, including pipeline resistance loss, generally reserve 0.1~0.2MPa margin);
✅ Compression ratio (discharge pressure/inlet pressure, single-stage compression ratio ≤ 4, multi-stage ≤ 10; ultra-high pressure requires series-connected units).

  • Operating Condition Fluctuation Range

    • Flow adjustment range: Conventional units adapt to 30%~110% of rated flow rate (select frequency conversion or inlet guide vane adjustment for high variable condition demand);

    • Inlet condition fluctuation: Temperature (±10℃), pressure (±5%); confirm whether temperature-resistant/high-pressure-resistant design is required (e.g., inlet temperature ≤ 80℃, add cooler if exceeding the limit).

2. Performance and Energy Efficiency Requirements

  • Efficiency Indicators

    • Isothermal efficiency: ≥75% for air compressors, ≥70% for process gas compressors (per API 617 standard, each 1% increase in efficiency reduces annual energy consumption by approximately 2%);

    • Specific power (shaft power/standard condition flow rate, kW·h/Nm³): The smaller the value, the more energy-efficient; ≤0.085kW·h/Nm³ for air compressors (at 0.7MPa pressure).

  • Adaptation of Adjustment Methods

    • Stable operating conditions: Select inlet guide vane adjustment (adjustment range 50%~100%, low energy consumption);

    • Significant variable operating conditions: Select frequency conversion adjustment (adjustment range 20%~100%, energy saving rate 20%~40%);

    • Emergency conditions: Anti-surge protection is required (surge line must be far from normal operating point, reserve 15%~20% safety margin).

3. Reliability and Maintenance Requirements

  • Continuous Operation Capability

    • Design life: ≥20 years, service life of wearing parts (e.g., bearings, seals) ≥8000 hours;

    • Standby configuration: Critical processes (e.g., petrochemical cracked gas compression) require 1 active + 1 standby unit, or parallel dual units (to ensure uninterrupted gas supply).

  • Sealing Performance

    • Zero-leakage requirement (e.g., food, pharmaceutical, toxic gases): Select dry gas seal (leakage ≤1Nm³/h);

    • General operating conditions: Select labyrinth seal (low cost, suitable for non-toxic media such as air and steam).

4. Environmental and Installation Requirements

  • Installation Conditions

    • Space dimensions: Reserve maintenance space (≥1.5m around the unit, ≥2.5m above the unit for impeller and bearing replacement);

    • Foundation load: Design based on total unit weight (including auxiliary equipment), dynamic load coefficient ≥1.2 (to avoid vibration transmission).

  • Cooling and Noise Reduction

    • Cooling method: Water cooling (inlet water temperature ≤32℃, water pressure 0.2~0.4MPa) or air cooling (ambient temperature ≤40℃, wind speed ≥2m/s);

    • Noise control: Unit operating noise ≤85dB(A) (at 1m distance); add sound insulation cover or silencer if exceeding the standard.

5. Compliance Requirements

  • Industry standards: Must comply with API 617 (Centrifugal Compressors for Petroleum, Chemical, and Gas Industry Services), GB/T 13275 (Centrifugal Fans for General Purposes), ASME BPVC (Boiler and Pressure Vessel Code);

  • Environmental requirements: Lubricating oil must comply with ISO VG 46/68 standard, waste oil discharge ≤5mg/L (to avoid medium or environmental pollution).

II. Core Parameter Reference Table (Classified by Category)
1. Performance Parameters (Key Indicators for Selection)
Parameter Name
Definition and Unit
Conventional Range
Selection Key Points
Standard Condition Flow Rate (Qₙ)
Gas volume flow rate under standard conditions
100~100,000 Nm³/h
Must match process gas consumption, reserve 10%~15% margin
Rated Discharge Pressure (P)
Outlet absolute pressure
0.3~10 MPa (single-stage ≤4MPa)
Include pipeline loss, avoid "over-capacity operation"
Compression Ratio (ε)
Discharge pressure/inlet pressure
1.5~4 (single-stage), ≤10 (multi-stage)
Ultra-high pressure (>10MPa) requires 2~3 series-connected units
Isothermal Efficiency (ηₜ)
Theoretical isothermal power/actual shaft power
≥75% (air compressors), ≥70% (process compressors)
Each 5% decrease in efficiency increases annual energy consumption by ~10%
Shaft Power (Pₛ)
Power required to drive the compressor
50~10,000 kW
Match motor power (motor power = shaft power/transmission efficiency)
Surge Flow Rate (Qₛᵤᵣ)
Minimum flow rate causing surge
30%~50% of rated flow rate
Normal operating flow rate ≥1.2×surge flow rate
2. Structural Design Parameters
Parameter Name
Common Specifications
Selection Adaptation Suggestions
Impeller Stages
1~10 stages (single-cylinder ≤6 stages)
Select single-stage for compression ratio ≤4, multi-stage for 4~10 (evenly distribute compression ratio per stage)
Impeller Material
Carbon steel (Q345R), stainless steel (304/316), Hastelloy
Carbon steel for air/steam, Hastelloy for corrosive gases
Shaft Seal Type
Labyrinth seal, dry gas seal, mechanical seal
Labyrinth seal for non-toxic media, dry gas seal for toxic/high-pressure media
Cooling Method
Water cooling (shell-and-tube), air cooling (finned)
Water cooling for large units (power ≥500kW), air cooling for small units
Drive Method
Motor drive, steam turbine drive
Motor drive for stable power grid, steam turbine drive for steam source (energy-saving)
Adjustment Mechanism
Inlet guide vane, frequency conversion, return valve
Frequency conversion for variable conditions ≤50%, inlet guide vane for 50%~100%
3. Operation Monitoring Parameters (Maintenance Reference)
Parameter Name
Normal Range
Alarm Threshold
Abnormal Cause Analysis
Discharge Temperature
≤120℃ (air compressors), ≤150℃ (process compressors)
>130℃ (air compressors)
Cooling system failure, excessive compression ratio
Bearing Temperature
Rolling bearing ≤80℃, sliding bearing ≤70℃
Rolling bearing >90℃, sliding bearing >80℃
Insufficient lubrication, bearing wear
Shaft Vibration Value
≤4.5 mm/s (RMS)
>6.3 mm/s
Impeller imbalance, coupling misalignment
Seal Gas Pressure
0.1~0.2MPa higher than discharge pressure
Deviation >±0.05MPa
Seal gas system leakage, pressure reducing valve failure
Lubricating Oil Pressure
0.2~0.4MPa
<0.15MPa
Oil pump failure, oil circuit blockage
III. Typical Industry Selection Examples (Parameter Reference)
Application Industry
Medium Type
Standard Condition Flow Rate (Nm³/h)
Rated Discharge Pressure (MPa)
Compression Ratio
Key Configuration Requirements
Petrochemical Industry (Catalytic Cracking)
Cracked Gas (C₂/C₃)
5000~20,000
2.5~4.0
6~8
Multi-stage compression + dry gas seal + anti-surge system, material: 316L
Natural Gas Transmission
Natural Gas (CH₄)
10,000~50,000
4.0~8.0
8~10
High-pressure resistant impeller + frequency conversion adjustment, adapt to pressure fluctuations
Power Industry (Gas Turbine)
Compressed Air
20,000~80,000
0.6~1.0
1.8~3
Single-stage/multi-stage + water cooling, isothermal efficiency ≥78%
Chemical Industry (Ammonia Synthesis)
Syngas (H₂/N₂)
3000~15,000
3.0~5.0
7~9
Optimized impeller for low-molecular-weight gas + explosion-proof motor
Metallurgical Industry (Blast Furnace Blowing)
Air
50,000~100,000
0.3~0.5
1.5~2
Dual-cylinder parallel connection + inlet guide vane adjustment, dust-resistant design
IV. Selection Precautions (Pitfall Avoidance Guide)

  1. Avoid "Flow/Pressure Overload": Actual operating flow rate shall not exceed 110% of rated flow rate, and pressure shall not exceed 105% of rated pressure; otherwise, impeller fatigue damage may easily occur;

  1. Do Not Ignore Medium Composition: For example, natural gas containing H₂S requires sulfur-resistant materials (e.g., SS 316L); hydrogen content ≥50% requires adjusting impeller speed (to avoid supersonic flow);

  1. Anti-Surge Protection Must Be In Place: Set surge alarm and automatic return valve in the control system to prevent the unit from entering the surge region due to sudden flow drop;

  1. Prioritize Energy Efficiency Over Initial Cost: High-efficiency units (isothermal efficiency ≥75%) have 10%~15% higher initial investment but can reduce annual energy consumption by 15%~20%, with cost recovery in 3~5 years;

  1. Synchronize Selection of Supporting Systems: Confirm parameter matching of cooling system (water volume/water temperature), lubricating oil system (oil brand/replacement cycle), and filtration system (precision/pressure difference) simultaneously.


Product Tags: Turbine compressor , Circulating supercharger , Nitrogen and oxygen compressor

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Le Bo Engineering (Hangzhou) Co., Ltd.
Verified Business License
Location
Hangzhou, Zhejiang, China
Contact Supplier Request Quote Chat Now

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