ZW-8/6 stikstofcompressor – compacte olievrije N2-booster voor lagedruk industriële gassystemen

De ZW-8/6 is een tweetraps, tweerijige olievrije zuigercompressor voor stikstof, ontworpen om 8 m³/min te leveren bij een persdruk van 0,60 MPa. Hij is geschikt voor kleinschalige cryogene luchtscheiding, stikstofvoorziening in laboratoria en compacte VPSA-boosterstations. De compressor is olievrij, compact en geoptimaliseerd voor zowel intermitterend als continu gebruik.

Productoverzicht

De ZW-8/6 nitrogen compressor represents a compact yet capable solution within our oil-free piston compressor family, specifically tailored for small-scale nitrogen boosting applications where space constraints and operational simplicity are paramount. With a rated capacity of 8 m³/min en een afvoerdruk van 0.60 MPa, this unit occupies the entry-level segment of our industrial nitrogen compressor portfolio while maintaining the same engineering rigor as our larger models.

The ZW-8/6 distinguishes itself through a volledig olievrij compressiemechanisme utilizing self-lubricating PTFE composite piston rings and rider bands. This design philosophy eliminates any possibility of hydrocarbon contamination in the nitrogen product stream, making the unit immediately suitable for laboratory-grade nitrogen, small-batch food packaging, pharmaceutical R&D, and electronics assembly line inerting without additional downstream purification equipment.

Zijn tweetraps, twee rijen (二列二级) configuration delivers a higher pressure ratio than single-stage alternatives while maintaining thermal stability through inter-stage cooling. The compact dimensions—2250 × 1296 × 2200 mm—allow the ZW-8/6 to fit into existing machinery rooms, containerized installations, or mobile nitrogen supply skids where floor space is at a premium. At just 2.00 tonnes, the unit can be transported and positioned without heavy-lift equipment.

Technical Specifications – ZW-8/6

* Alle specificaties zijn gebaseerd op standaard referentieomstandigheden (ISO 1217, bijlage C). De werkelijke prestaties kunnen variëren afhankelijk van de hoogte van de locatie, de omgevingstemperatuur en de inlaatcondities.

Belangrijkste kenmerken en technische voordelen

1. Compact Footprint for Space-Constrained Installations

Bij 2250 × 1296 × 2200 mm, the ZW-8/6 occupies less than 3 m² of floor space, making it one of the most compact oil-free nitrogen compressors in its capacity class. This dimensional efficiency is achieved through a vertically oriented crankcase design that minimizes the machine’s longitudinal footprint while maintaining adequate maintenance access. The 2.00-tonne weight permits installation using standard forklift equipment, eliminating the need for overhead cranes or specialized rigging during commissioning or relocation.

2. Oil-Free PTFE Sealing Technology

The ZW-8/6 employs a zelfsmurend zuigerveer- en geleidebandsysteem constructed from high-performance PTFE composites. These rings operate with a coefficient of friction below 0.08 without any hydrocarbon lubricant, delivering ISO 8573-1 Klasse 0 oliegehalte in the compressed nitrogen stream. For small-scale users such as analytical laboratories, food R&D facilities, and electronics manufacturers, this native oil-free certification eliminates the capital expense and maintenance burden of downstream oil-filtration systems that would otherwise be mandatory.

3. Two-Stage Compression for Higher Pressure Ratios

De tweefasige, tweerijige architectuur divides the pressure ratio between a low-pressure cylinder and a high-pressure cylinder, with an inter-stage shell-and-tube cooler removing the heat of compression. This staged approach limits the discharge temperature of each stage to below 150°C, preventing thermal degradation of the PTFE sealing elements and extending valve plate life by approximately 30% compared to single-stage compressors operating at equivalent overall pressure ratios. The 0.60 MPa discharge pressure is particularly well-suited for medium-pressure nitrogen distribution in small industrial facilities.

4. Standard 380V Direct-On-Line Motor Drive

The ZW-8/6 is powered by a 55 kW, 380V, 50Hz three-phase induction motor rated to IEC 60034-1 IE3 efficiency class. The standard low-voltage configuration integrates directly into existing 380V industrial distribution panels without requiring medium-voltage infrastructure, step-down transformers, or specialized switchgear. This electrical simplicity reduces both capital expenditure and commissioning complexity, making the ZW-8/6 an attractive option for facilities upgrading from bottled nitrogen or membrane generators to on-site compression.

Toepassingsscenario's

Small-Scale Cryogenic Air Separation Units

In compact cryogenic ASU installations producing 200–500 Nm³/h of gaseous nitrogen, the ZW-8/6 serves as the primaire stikstofbooster between the cold box and the distribution network. Its 8 m³/min capacity aligns with the output of small-scale ASUs, while the 0.60 MPa discharge pressure provides sufficient head for distribution to nearby process equipment, laboratory fume hoods, or storage tank blanketing systems. The oil-free design is critical in these applications because small ASUs typically lack the extensive purification trains found in large facilities, making downstream oil contamination particularly problematic.

Compact VPSA Nitrogen Booster Stations

For small to medium VPSA nitrogen generators producing 99.5–99.9% purity nitrogen at near-atmospheric pressure, the ZW-8/6 nitrogen booster compresses the low-pressure product to 0.60 MPa for distribution. The compact footprint of the ZW-8/6 allows it to be mounted on the same skid as the VPSA generator, creating a fully integrated nitrogen supply system that occupies minimal floor space. The oil-free compression path protects the carbon molecular sieve from hydrocarbon poisoning, preserving the generator’s separation efficiency and extending adsorbent life.

Laboratory & Analytical Gas Supply

Research laboratories, analytical chemistry facilities, and university science departments require a reliable supply of high-purity nitrogen for gas chromatography, mass spectrometry, and inert atmosphere glove boxes. The ZW-8/6’s oil-free certification ensures that the nitrogen stream meets the stringent purity requirements of analytical instruments without requiring additional purification cartridges. The 8 m³/min capacity can support multiple GC-MS systems, ICP-MS instruments, and glove boxes operating simultaneously within a single laboratory building.

Electronics Manufacturing & Soldering Inerting

In electronics assembly facilities, nitrogen is used for wave soldering inerting, reflow oven atmosphere control, and component storage dry cabinets. The ZW-8/6’s 0.60 MPa discharge pressure is adequate for feeding nitrogen distribution manifolds serving multiple soldering lines and storage cabinets. The oil-free design is non-negotiable in electronics applications because even trace oil contamination can cause solder joint defects, conformal coating adhesion failures, and contamination of sensitive optical components.

Materiaal en constructie

The ZW-8/6 is constructed from materials selected for nitrogen compatibility, corrosion resistance, and compact structural integrity:

Alle drukdragende componenten voldoen aan ASME BPVC Sectie VIII Divisie 1 or Chinese GB 150 standards. Weld joints are subjected to 100% radiographic inspection (RT), and each pressure vessel undergoes hydrostatic testing at 1.5× MAWP for a minimum 30-minute hold period before release.

Installatie- en onderhoudsrichtlijnen

Fundament- en ruimtelijke vereisten

The ZW-8/6 weighs 2.00 tonnes and features a low center of gravity due to its compact vertical design. A reinforced concrete pad of 3–4 tonnes is sufficient for stable operation, mounted on elastomeric vibration isolators (natural frequency 8–12 Hz). The two-row opposed-cylinder arrangement inherently cancels first-order inertial forces, minimizing vibration transmission. Required clearances: 1.0 m on the non-drive side for valve maintenance, 0.8 m on the drive side for motor access, and 1.5 m overhead for routine service.

Specificaties koelwater

De koelwaterbehoefte bedraagt ​​ongeveer 12 m³/h at an inlet temperature not exceeding 32°C. The water distribution circuit feeds the cylinder jackets and intercooler in parallel. Acceptable water quality: pH 6.5–8.5, total hardness < 300 mg/L as CaCO₃, chloride < 50 mg/L, suspended solids < 30 mg/L. For installations without reliable municipal water supply, a compact closed-loop cooling tower with a 1 m³ buffer tank is recommended.

Onderhoudsintervallen

The oil-free design of the ZW-8/6 dramatically simplifies maintenance compared to lubricated alternatives. There are no oil changes to schedule, no oil samples to analyze, no filter elements to replace, and no oil separator cartridges to monitor. The only consumable wear items are the PTFE-zuigerveren en geleidebanden, which typically achieve 4,000–6,000 hours of service under clean nitrogen conditions.

Certificeringen voor naleving en veiligheid

The ZW-8/6 nitrogen compressor meets the following international standards and regulatory requirements:

Prestatie- en efficiëntieanalyse

The ZW-8/6 achieves a specific power consumption of approximately 6.88 kW per m³/min of nitrogen at 0.60 MPa discharge pressure. While this specific power is higher than our larger LW-series models due to the reduced scale efficiency, it remains competitive within the sub-10 m³/min oil-free piston compressor segment. For comparison, oil-lubricated screw compressors in this size range typically consume 7.2–8.0 kW/m³/min, and diaphragm compressors (often selected for oil-free applications) can exceed 10 kW/m³/min.

Over an 8,000-hour annual operating cycle, the ZW-8/6’s efficiency advantage versus less efficient alternatives yields approximately 20,000–45,000 kWh of energy savings per year. At $0.08/kWh, this represents $1,600–$3,600 in annual electricity cost reduction. However, the primary economic driver for ZW-8/6 selection is typically the eliminatie van oliegerelateerde verbruiksartikelen en apparatuur voor verdere zuivering in plaats van marginale energiebesparingen.

De totale eigendomskosten voor stikstofcompressie in small-scale applications is dominated by maintenance labor and consumables rather than energy. The ZW-8/6’s oil-free design eliminates oil changes ($400–800/year), filter replacements ($200–400/year), separator cartridge changes ($600–1,200/year), and oil analysis ($150–300/year), delivering a total consumable savings of $1,350–$2,700 annually compared to lubricated alternatives.

Mogelijkheden voor maatwerk en OEM-productie

We provide flexible customization options to adapt the ZW-8/6 to specific installation constraints and end-user requirements:

• Pakketten op een frame: Voorgemonteerde compressor, motor, koeler en bedieningspaneel op een stalen frame met vorkheftruckopeningen en hijsogen. Vereenvoudigt de installatie ter plaatse tot alleen de elektrische aansluiting en de koelwateraansluiting.
• Mobiele aanhangwagens: The ZW-8/6 can be mounted on a road-legal trailer with integrated diesel generator, cooling system, and nitrogen storage, creating a fully mobile nitrogen supply unit for construction sites, pipeline maintenance, and emergency response.
• PLC en bewaking op afstand: Optional Siemens LOGO! or S7-1200 PLC with 7-inch HMI touchscreen, Ethernet connectivity, and SMS/email alarm notifications. Compatible with Modbus TCP/IP for SCADA integration.
• Akoestische behuizingen: Compacte, IP54-gecertificeerde geluidsisolerende behuizing die het geluid op 1 meter afstand reduceert van 82 dB(A) tot 68 dB(A), geschikt voor binneninstallaties in geluidsgevoelige omgevingen zoals laboratoria en machinekamers naast kantoren.
• OEM & Private Label: Aangepaste lakafwerkingen, merknaamplaatjes en lokale documentatiepakketten voor distributeurs en systeemintegratoren van gasapparatuur.

Aangepaste configuraties zijn beschikbaar via Minimale bestelhoeveelheid: 1 stuk. Engineering proposals are typically delivered within 3–5 business days. Standard delivery time is 10–12 weeks; expedited delivery within 8 weeks is available for qualifying orders.

Case Study: Laboratory Nitrogen Supply Upgrade

Cliënt: A pharmaceutical research institute in Singapore

Uitdaging: The institute was purchasing liquid nitrogen in 200-liter dewars and vaporizing on-site for laboratory supply. Monthly nitrogen consumption reached 15,000 Nm³, with delivery costs, dewar rental fees, and vaporization losses consuming 40% of the annual gas budget. Additionally, liquid nitrogen deliveries were unreliable during public holidays and inclement weather, causing experiment delays.

Oplossing: Wij leverden een ZW-8/6 oil-free nitrogen compressor paired with a small VPSA nitrogen generator (99.9% purity, 10 m³/min) on a common skid. The ZW-8/6 boosts the VPSA product from 0.08 MPa to 0.60 MPa for distribution through the existing laboratory nitrogen header. The entire system occupies 8 m² in a corner of the building’s utility room.

Resultaten na 18 maanden:

• Stikstofleveringskosten: Reduced by 52% versus liquid nitrogen purchase and delivery
• Leveringsbetrouwbaarheid: 100% uptime since commissioning, zero experiment delays due to gas shortage
• Stikstofzuiverheid: Consistent >99,9% with oil content <0.01 mg/m³, exceeding analytical instrument requirements
• Maintenance burden: Eén geplande onderhoudsbeurt per jaar (4,000-hour interval), versus monthly dewar changeovers
• Terugverdienperiode: 2.4 years based on gas cost savings alone

“The ZW-8/6 compressor has transformed our nitrogen supply from a logistical headache into a reliable utility. Our researchers no longer worry about gas availability, and the finance department appreciates the 50% cost reduction.” — Facilities Manager, Pharmaceutical Research Institute

Veelgestelde vragen en selectiegids

Gerelateerde producten en oplossingen

Voor een volledig overzicht van onze industriële stikstofcompressor Voor ons portfolio, inclusief olievrije zuurstofcompressoren, waterstofcompressoren en oplossingen voor speciale gassen, kunt u contact opnemen met ons engineeringteam of onze online catalogus raadplegen.

Ready to Upgrade Your Nitrogen Supply?

Our application engineers are available to review your nitrogen flow requirements, inlet conditions, and discharge pressure specifications. We provide complimentary technical proposals, layout drawings, and TCO analyses within 48 hours.

E-mail: [email protected] | Reactie binnen 24 uur