3ZW-6/30 Nitrogen Compressor – Three-Stage Oil-Free N2 Booster for 3.00 MPa High-Pressure Process Applications

Engineered to deliver 6 m³/min at 3.00 MPa discharge pressure, the 3ZW-6/30 is a three-stage, three-row oil-free piston nitrogen compressor designed for ultra-high-pressure nitrogen injection, gas cylinder filling stations, and demanding chemical synthesis processes. Zero oil contamination, robust multi-stage architecture, and optimized for continuous-duty operation at extreme pressure.

产品概述

这 3ZW-6/30 nitrogen compressor represents the pinnacle of our oil-free piston compressor technology, engineered specifically for applications that demand both substantial flow capacity and ultra-high discharge pressure. With a rated capacity of 6 m³/min and an exceptional 3.00 MPa 排气压力, this unit occupies the high-pressure segment of our industrial nitrogen compressor portfolio, serving the most demanding process applications in the chemical, petrochemical, and gas distribution industries.

The “3ZW” designation signifies the three-stage, three-row (三列三级) architecture that is fundamental to achieving the 3.00 MPa discharge pressure while maintaining thermal stability and mechanical reliability. Each of the three compression stages operates at a moderate pressure ratio, with dedicated intercoolers between stages removing the heat of compression. This multi-staged approach is essential because the overall pressure ratio from atmospheric inlet to 3.00 MPa exceeds the safe operating limits of single-stage or two-stage designs, both in terms of discharge temperature and mechanical stress on the pistons and crankshaft.

What distinguishes the 3ZW-6/30 from conventional alternatives is its 完全无油压缩通道. The piston rings and rider bands are precision-machined from advanced self-lubricating PTFE composite materials that operate without any hydrocarbon lubricants. At 3.00 MPa discharge pressure, the risk of oil vapor carryover is exponentially higher than at low-pressure applications, making the oil-free design not merely advantageous but absolutely mandatory for any application requiring high-purity nitrogen. The unit achieves ISO 8573-1 0级认证 natively, without downstream oil-filtration equipment.

Technical Specifications – 3ZW-6/30

* 所有规格均在标准参考条件下（ISO 1217，附录 C）测得。实际性能可能因现场海拔、环境温度和进气条件而异。

主要特性及工程优势

1. Three-Stage Compression for Ultra-High Pressure

这 three-stage, three-row architecture of the 3ZW-6/30 is the engineering foundation that makes 3.00 MPa discharge pressure achievable with oil-free piston technology. The overall pressure ratio of approximately 30:1 to 60:1 (from atmospheric inlet) is divided across three compression cylinders, with each stage operating at a pressure ratio of approximately 3:1 to 4:1. This staged approach is thermodynamically essential because single-stage compression to 3.00 MPa would produce discharge temperatures exceeding 300°C, far beyond the safe operating limit of PTFE sealing materials. Between each stage, a dedicated high-efficiency shell-and-tube intercooler removes the heat of compression, maintaining discharge temperatures below 155°C at all stages. This thermal management preserves PTFE ring integrity and extends valve plate life by approximately 50% compared to two-stage designs attempting equivalent pressure ratios.

2. Advanced High-Pressure Oil-Free PTFE Sealing System

The 3ZW-6/30 employs a proprietary 自润滑活塞环和导向带组件 manufactured from ultra-high-performance PTFE composites specifically formulated for 3.00 MPa service. These rings are reinforced with glass fiber, bronze particulates, and molybdenum disulfide to achieve a coefficient of friction below 0.05 without any external hydrocarbon lubrication. At 3.00 MPa discharge pressure, the partial pressure of oil vapor would be approximately 10 times higher than at 0.30 MPa, making oil contamination exponentially more severe and more difficult to remove downstream. The 3ZW-6/30’s native oil-free design achieves ISO 8573-1 0级认证 without any downstream filtration, coalescing, or adsorption equipment. The PTFE formulation is rated for continuous operation at temperatures up to 185°C, with a safety margin that accommodates transient temperature excursions during startup and load changes.

3. Three-Row Opposed-Cylinder Force Balance

主框架由……铸造而成 GG25 gray cast iron with reinforced wall sections and integral cooling water passages. The three-row opposed-cylinder arrangement provides superior force balance compared to single-row or two-row designs, with first-order and second-order inertial forces largely self-canceling. This mechanical advantage is particularly critical for high-pressure compressors where the peak gas forces on the pistons are substantially higher than in low-pressure applications. The three-row configuration reduces the unbalanced forces transmitted to the foundation by over 85% compared to single-row designs, permitting installation on a lighter reinforced concrete inertia block (minimum 5 tonnes) and reducing the risk of vibration-induced fatigue in connected piping systems. The compact dimensions—1845 × 1660 × 2360 mm—are remarkable for a three-stage compressor of this pressure class, achieved through a vertically stacked cylinder arrangement that minimizes the machine’s footprint.

4. Standard 380V Industrial Motor Drive

The 3ZW-6/30 is driven by a 75 kW, 380V, 50Hz three-phase induction motor conforming to IEC 60034-1 efficiency class IE3. The standard low-voltage configuration integrates directly into existing 380V industrial distribution panels without requiring medium-voltage switchgear or step-down transformers. This electrical simplicity is particularly valuable for the 3ZW-6/30 because its moderate power requirement (75 kW) does not justify the complexity and cost of medium-voltage infrastructure. The motor is directly coupled to the crankshaft through a flexible disc coupling, eliminating the maintenance burden and efficiency losses associated with belt or gearbox drives.

应用场景

Ultra-High-Pressure Nitrogen Cylinder Filling

The 3ZW-6/30 is the ideal primary booster for nitrogen cylinder filling stations serving industrial, medical, and specialty gas markets. While the compressor’s 3.00 MPa discharge pressure does not reach the 15–20 MPa required for direct cylinder filling, it serves as a highly efficient intermediate stage that dramatically reduces the compression ratio required of downstream high-pressure filling compressors. In a typical filling station configuration, the 3ZW-6/30 boosts nitrogen from 0.05–0.10 MPa to 3.00 MPa, after which a compact high-pressure diaphragm or piston compressor completes the filling to 20 MPa. This staged approach improves overall system efficiency by 25–35% compared to single-stage high-pressure compression from atmospheric inlet. The oil-free design is mandatory for cylinder filling because any oil contamination would be trapped in the filled cylinders and delivered to end-users, potentially compromising their processes and exposing the filling station to liability.

Chemical Synthesis & High-Pressure Reactor Inerting

In chemical process plants, the 3ZW-6/30 nitrogen compressor provides ultra-high-pressure nitrogen for high-pressure reactor inerting, catalyst bed preservation, and emergency depressurization of process vessels. The 3.00 MPa discharge pressure is sufficient to inject nitrogen into reactors operating at pressures up to 2.5 MPa, maintaining positive inert gas blankets during all phases of operation. The three-stage compression ensures that the nitrogen remains thermally stable and free of oil contamination, which is critical in chemical synthesis where even trace contaminants can poison catalysts, initiate unwanted side reactions, or compromise product purity. The 6 m³/min capacity can serve multiple high-pressure reactors simultaneously through a centralized nitrogen header.

Gas Liquefaction & Cryogenic Storage Pressure Maintenance

In nitrogen liquefaction plants and cryogenic storage facilities, the 3ZW-6/30 serves as a high-pressure booster that compresses nitrogen vapor from storage tanks or recondensers to the pressure required for distribution or further processing. The 3.00 MPa discharge pressure is adequate for driving nitrogen through heat exchangers, recondensers, and distribution networks in small to medium liquefaction plants. The oil-free design is essential because any oil contamination in the high-pressure nitrogen would be carried into the cryogenic system, where it would freeze and block heat exchanger passages, causing operational failures and costly maintenance. The three-stage compression with intercooling ensures that the nitrogen remains at manageable temperatures throughout the compression process, preventing thermal damage to downstream cryogenic equipment.

Oil & Gas Well Nitrogen Injection

In oil and gas production operations, high-pressure nitrogen is injected into wells for enhanced oil recovery (EOR), well stimulation, and gas lift operations. The 3ZW-6/30’s 3.00 MPa discharge pressure is sufficient for many shallow to medium-depth well applications, where nitrogen is used to displace oil, reduce reservoir pressure, or lift production fluids to the surface. The oil-free design prevents hydrocarbon contamination of the reservoir, which could alter formation permeability and reduce oil recovery efficiency. The 6 m³/min capacity can support continuous nitrogen injection for extended well stimulation campaigns or intermittent gas lift operations for multiple wells.

材料与施工

The 3ZW-6/30 is constructed from premium materials selected for ultra-high-pressure nitrogen compatibility, thermal resistance, and extended operational life:

所有承压部件的设计和制造均严格按照以下规定进行： ASME BPVC 第 VIII 节第 1 部分 或符合中国GB 150标准。所有焊接接头均按照ASME第五卷第二条进行100%射线探伤（RT），每个完工的压力容器均需进行1.5倍最大允许工作压力（MAWP）的水压试验，保持时间至少30分钟。高压管道系统采用无缝SS316不锈钢制造，并使用ANSI 900级法兰连接，以确保在3.00 MPa工作压力下具有良好的密封性。

安装和维护指南

基础及结构要求

The 3ZW-6/30 has a dry weight of 3.00 tonnes and a center of gravity approximately 800 mm above the baseplate. Thanks to the three-row opposed-cylinder design, unbalanced forces are minimal despite the ultra-high-pressure operation, permitting installation on a reinforced concrete inertia block of 5–6 tonnes. The block should be mounted on elastomeric vibration isolators (natural frequency 7–10 Hz). Minimum clearance requirements: 1.2 m on the non-drive side for valve access, 1.0 m on the drive side for motor maintenance, and 1.5 m overhead for crane access. Special attention must be paid to the high-pressure discharge piping, which must be properly supported with spring hangers and anchored to prevent vibration-induced fatigue at 3.00 MPa. All high-pressure connections must be verified with ultrasonic testing after installation.

冷却水系统设计

冷却水需求量约为 15 m³/h at an inlet temperature not exceeding 32°C. The water distribution circuit supplies the cylinder jackets and two intercoolers in parallel branches. Given the three-stage compression and high pressure ratio, the intercoolers are absolutely critical for thermal management and must receive adequate cooling water flow at all times. Water quality specifications: pH 6.5–8.5, total dissolved solids < 500 mg/L, chloride content < 50 mg/L (to prevent SS316 tube corrosion), suspended solids < 30 mg/L, and total hardness < 300 mg/L as CaCO₃. A closed-loop cooling tower with side-stream filtration and chemical treatment is strongly recommended for all installations to ensure consistent water quality and prevent scale formation in the intercoolers.

预防性维护计划

The oil-free design of the 3ZW-6/30 dramatically simplifies maintenance compared to lubricated alternatives. There are no oil changes, no oil analysis, no filter replacements, and no separator cartridge changes. The primary consumable wear items are the 聚四氟乙烯活塞环和活塞环带, which typically achieve 2,500–4,000 hours of service life under clean nitrogen conditions at ultra-high pressure. The high-pressure valve plates (particularly on the third stage) may require more frequent inspection than low-pressure equivalents due to the increased mechanical stress, but the overall maintenance burden remains significantly lower than oil-lubricated systems of equivalent pressure capability.

合规与安全认证

The 3ZW-6/30 nitrogen compressor is designed, manufactured, and tested to meet or exceed the following international standards and regulatory frameworks:

性能与效率分析

The 3ZW-6/30 achieves a specific power consumption of approximately 12.50 kW per m³/min of nitrogen delivered at 3.00 MPa discharge pressure from atmospheric inlet. This specific power figure reflects the thermodynamic reality of ultra-high-pressure compression, where the work required increases substantially with pressure ratio. Within the ultra-high-pressure oil-free piston compressor segment (discharge pressure >2.50 MPa), this efficiency is competitive and significantly superior to diaphragm compressors, which are the primary alternative for oil-free ultra-high-pressure service. For comparison, oil-lubricated reciprocating compressors in similar ultra-high-pressure applications typically consume 13.0–15.0 kW/m³/min, while diaphragm compressors may exceed 18 kW/m³/min.

Over a standard 8,000-hour annual operating schedule, the 3ZW-6/30’s efficiency advantage versus less efficient alternatives yields approximately 72,000–144,000 kWh of annual energy savings. At $0.08/kWh, this represents $5,760–$11,520 in direct electricity cost reduction per year. However, the primary economic justification for the 3ZW-6/30 is typically the 消除与石油相关的消耗品，并避免使用下游除油设备 that would be mandatory with lubricated alternatives at this pressure level. The 超高压氮气压缩的总拥有成本 is reduced by an estimated 30–45% over a 10-year operational life when oil-free operation is compared to lubricated systems with full downstream purification.

The absence of oil in the compression path is particularly valuable at ultra-high pressure because oil contamination becomes exponentially more concentrated and more difficult to remove as pressure increases. At 3.00 MPa, the partial pressure of oil vapor would be approximately 15 times higher than at 0.30 MPa, making downstream oil-filtration systems virtually ineffective and prohibitively expensive. The 3ZW-6/30’s native oil-free design eliminates this challenge entirely, ensuring that nitrogen purity is maintained regardless of operating pressure.

定制化和OEM能力

We offer comprehensive customization options to adapt the 3ZW-6/30 to specific site conditions, integration requirements, and end-user specifications:

• Skid-Mounted Turnkey Packages: Pre-assembled compressor, motor, three intercoolers, aftercooler, high-pressure discharge piping, instrumentation, and control panel on a structural steel skid with integrated lifting lugs and anchor bolt templates. Factory pre-testing of all systems reduces commissioning time by 70%.
• 危险区域配置： ATEX Zone 2 and IECEx compliant motor and electrical enclosures for petrochemical installations. Integrated gas detection, automatic ventilation interlocks, and explosion-proof instrumentation.
• 高级过程控制： Optional Siemens S7-1200 or Allen-Bradley CompactLogix PLC with 10-inch HMI touchscreen, remote monitoring via Modbus TCP/IP or OPC-UA, and seamless DCS/SCADA integration. Automatic stage-by-stage pressure monitoring and alarm systems. High-pressure safety interlocks including automatic unload on overpressure and emergency isolation valves on all stages.
• 环境保护： C5-M marine-grade coatings for coastal installations; tropicalized electrical components for 55°C ambient; IP54-rated acoustic enclosures reducing noise from 85 dB(A) to 72 dB(A) at 1 meter.
• OEM & Private Label: Custom paint colors, branded nameplates, and localized documentation packages for gas equipment distributors and system integrators.

可提供自定义配置 最小起订量 1 件. Engineering review and proposal generation typically require 5–7 business days. Standard delivery time is 12–14 weeks; repeat orders are delivered in 8–10 weeks from order confirmation.

Case Study: Chemical Synthesis Plant Nitrogen Injection Upgrade

客户： A specialty chemical manufacturer in Indonesia operating high-pressure batch reactors for polymer production

挑战： The plant required ultra-high-pressure nitrogen (2.80–3.00 MPa) for reactor inerting and catalyst bed preservation during batch polymerization cycles. Their existing oil-lubricated compressor (imported European brand, 12 years in service) was experiencing severe oil carryover into the nitrogen stream, with contamination levels reaching 5.2 mg/m³. This oil contamination was poisoning the Ziegler-Natta polymerization catalyst, reducing catalyst efficiency by 30% and causing off-specification polymer batches. The oil was also fouling the reactor heat transfer surfaces, requiring quarterly chemical cleaning. Annual maintenance costs had escalated to $65,000.

解决方案： 我们提供了 3ZW-6/30 oil-free nitrogen compressor as the primary high-pressure nitrogen source, configured on a custom skid with three integrated intercoolers, aftercooler, and a Siemens S7-1200 PLC control panel with stage-by-stage pressure monitoring. The 3.00 MPa discharge pressure met the reactor inerting requirements with a safety margin. The oil-free design eliminated catalyst poisoning and reactor fouling. A 2 m³ surge vessel was installed upstream to buffer demand fluctuations from the batch reactor cycle.

Quantified Results After 18 Months:

• 氮油含量： Reduced from 5.2 mg/m³ to <0.01 mg/m³达到 ISO 8573-1 0 级标准
• Catalyst efficiency: Restored to 95% (from 65%), reducing catalyst consumption by 32%
• Off-specification batches: Eliminated completely, saving $45,000/year in rework costs
• Reactor cleaning frequency: Reduced from quarterly to annually, saving $18,000/year
• Annual maintenance cost: Reduced by 48% ($65,000 to $33,800)
• Payback period: 1.6 years based on catalyst savings, rework elimination, and maintenance reduction

“The 3ZW-6/30 has transformed our polymerization process. The elimination of oil contamination has restored our catalyst performance to design levels and eliminated our off-spec batch problem. Our maintenance team now spends their time on preventive activities rather than emergency oil-related repairs. The payback was faster than our finance team projected.” — Production Director, Specialty Chemical Plant

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