Chlorine Compressor

Chlorine (Cl₂) is a yellow-green, highly toxic gas with a strong pungent odor. Its density is approximately 2.5 times that of air, making it prone to accumulation in low-lying areas. As a strong oxidizing agent, its chemical properties are extremely reactive. Upon contact with water, it instantly reacts to form highly corrosive hydrochloric acid and hypochlorous acid, posing a severe challenge to the corrosion resistance of materials in the compression system. Industrially, chlorine is a core raw material in key processes such as polyvinyl chloride (PVC) production, pesticide synthesis, water treatment disinfection, and bleaching. Due to the triple risks involved in its compression – high toxicity, strong oxidation, and corrosion upon contact with water – equipment selection must prioritize absolute safety, zero leakage, and ultimate corrosion resistance. Therefore, the diaphragm compressor, with its inherent structural advantages, becomes the preferred solution.

DIAPHRAGM COMPRESSOR

PISTON COMPRESSOR

Chlorine Diaphragm Compressor Advantages

01

Absolutely Oil-Free & Zero Leakage Seal:

The "static seal" structure of the diaphragm compressor ensures that the gas is 100% free from contact with lubricating oil, fully meeting the "absolute oil-free" requirement for chlorine compression. Simultaneously, its embedded diaphragm head or combined oil distribution plate design significantly reduces sealing surfaces. Coupled with high-strength bolt pre-tightening, it achieves zero leakage containment of highly toxic chlorine, preventing the escape of poisonous gas that could harm personnel and the environment, and also preventing external moisture from entering the system and causing corrosion.
02

Ultra-High Gas Purity Maintenance & Active Safety Protection:

This structure absolutely guarantees that the purity of the compressed chlorine is free from any contamination. The standard three-layer diaphragm rupture alarm system is key to active safety. When any layer of the diaphragm experiences an anomaly, a pressure switch immediately triggers an audible and visual alarm and automatically initiates an interlock shutdown to prevent the incident from escalating. This characteristic makes it especially suitable for electronic-grade high-purity chlorine or chemical processes with stringent cleanliness requirements.

Key Design Points for Chlorine Diaphragm Compressors

01

Strict Distinction of Material Corrosion Resistance Based on Moisture Content:

Material selection is the decisive factor in chlorine compressor design. For dry chlorine with a moisture content strictly controlled to ≤ 0.05% (by weight), carbon steel may be considered for wetted parts. However, for the vast majority of operating conditions where moisture may be present, chlorine reacts with water to form hydrochloric acid, necessitating the use of high-grade corrosion-resistant alloys. Technical agreements typically mandate that all wetted metal parts be made of 316L stainless steel or higher grade materials, with special requirements for welding procedures and surface passivation treatment to address potential stress corrosion cracking induced by chloride ions.
02

Integrated Safety Purge and Purging System:

Before startup, the compressor and the entire piping system must be thoroughly purged with high-purity nitrogen or inert gas to expel air and moisture, preventing the formation of explosive mixtures or corrosive environments. The design must integrate dedicated purge and vent connections and valve groups to ensure the operating procedures can be executed simply and reliably.
03

Targeted Diaphragm Cavity and Monitoring Design:

The diaphragm must be made of a special alloy material resistant to chlorine corrosion. The diaphragm cavity profile needs to be optimized to extend diaphragm life. The system must be equipped with comprehensive temperature and pressure monitoring. The discharge temperature should be controlled within a safe range (typically well below the general limit of 180°C) through efficient inter-stage coolers, with over-limit alarms and shutdowns configured. All electrical instruments must meet an explosion-proof rating of at least Ex d IIB T4 to suit the potentially explosive environment.

Certificate

MODEL SELECTION

Model G70Z/G95Z/G110Z/G130Z	Piston Stroke 70mm~130mm	Maximum Piston Force 10KN~30KN
Maximum Discharge Pressure 70Mpa	Flow Range 1~500Nm³/h	Motor Power 2.2KW~30KW
Crankshaft Speed 420rpm	Cooling Method Water Cooled/Air Cooled

Model G70V/G95V/G130V	Piston Stroke 70mm~130mm	Maximum Piston Force 10KN~30KN
Maximum Discharge Pressure 50Mpa	Flow Range 1~200Nm³/h	Motor Power 2.2KW~30KW
Crankshaft Speed 420rpm	Cooling Method Water-cooled / Air-cooled

Model G110L/G130L	Piston Stroke 110mm~130mm	Maximum Piston Force 20KN~40KN
Maximum Discharge Pressure 100Mpa	Flow Range 10~1000Nm³/h	Motor Power 7.5KW~90KW
Crankshaft Speed 420rpm	Cooling Method Water-cooled / Air-cooled

Model G110D/G130D/G150D/ G180D/G182D/G210D	Piston Stroke 110mm~210mm	Maximum Piston Force 20KN~160KN
Maximum Discharge Pressure 100Mpa	Flow Range 30~2000Nm³/h	Motor Power 22KW~200KW
Crankshaft Speed 420rpm	Cooling Method Water-cooled / Air-cooled

Diaphragm type compressor

Piston stroke 70mm

Flow(Nm3/h)

Inlet pressure(barg)

Outlet pressure(barg)

No.	Model	Cooling water	Flow	Inlet pressure	Outlet pressure	Dimensions L×W×H	Weight	Motor Power
No.	Model	(L/h)	(Nm³/h)	(MPa)	(MPa)	(≈mm)	(≈kg)	(kW)
1	GZ-5/6-10	500	5	0.6	1	1200×700×1100	700	2.2
2	GZ-7/0.1-6	500	7	0.01	0.6	1200×900×1200	800	3
3	GZ-1/1.5-8	500	1	0.15	0.8	1200×900×1200	800	4
4	GV-0.35/100	500	0.35	Atmospheric	10	1200×850×1200	1000	3
5	GV-23/1	500	23	Atmospheric	0.1	1200×900×1250	900	5.5
6	GV-70/5-10	1000	70	0.5	1	1200×900×1300	900	7.5
7	GL-25/15	1000	25	Atmospheric	1.5	2200×1650×1450	3000	7.5
8	GL-150/0.3-5	2000	150	0.03	0.5	3230×1770×2200	3000	18.5
9	GL-170/2.5-18	2000	170	0.25	1.8	2900×2000×1700	3000	22
10	GD-900/（2-6）-12	5000	900	0.2-0.6	1.2	3500×2300×1500	4500	45
11	GD-600/1.5-5	5000	600	0.15	0.5	3500×2300×1800	4500	45
12	GD-1306/（5-7）-12	8000	1306	0.5-0.7	1.2	3800×2300×1800	6000	75

The equipment size and weight are for reference only, and the final design shall prevail.

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CASE STUDY

Russia
UNITED STATES
Spain
Kazakhstan

Chlorine Piston Compressor Advantages

01

Handling Large Flow Rates and Higher Discharge Pressures:

When the process requires handling exceptionally large chlorine flow rates (up to thousands of Nm³/h) or achieving relatively high discharge pressures, multi-cylinder piston compressors can demonstrate superior technical and economic adaptability, meeting the gas boosting needs of large-scale production in industries such as chlor-alkali.
02

Mature Technology and Maintainability:

For certain industrial applications with relatively relaxed gas purity requirements and comprehensive safety protection facilities, specially designed oil-free lubricated piston compressors offer a long-proven technical route with maintenance procedures that are relatively familiar to operations teams.

Key Design Points for Chlorine Piston Compressors

01

Complex Oil-Free Lubrication and Dynamic Seal System:

This is the greatest challenge for using a piston compressor with chlorine. The cylinder must adopt an oil-free lubrication design, utilizing self-lubricating materials such as filled PTFE for piston rings and packing. More critically, a long distance piece isolation chamber structure must be employed, with dry nitrogen or instrument air continuously introduced into the isolation chamber for purging and buffering. This system can safely route any chlorine that might leak through the piston rod packing to an exhaust gas treatment unit, while completely isolating the cylinder from the oil-containing crankcase.
02

Comprehensive Corrosion Protection and Material Selection:

Similar to diaphragm compressors, all components in contact with chlorine must be made of corrosion-resistant materials selected based on the gas's moisture content (dry or wet), ranging from carbon steel to 316L stainless steel. Special attention must be paid to the material compatibility of small parts such as valve springs. The system piping should be equipped with buffer tanks of sufficient volume to effectively reduce gas flow pulsation and minimize fatigue damage to pipes and equipment.
03

Mandatory Leakage Collection and Safety Relief:

Piston compressors must acknowledge the possibility of leakage through their dynamic seals. Therefore, the design must incorporate a closed leakage gas collection system to route the packing leakage gas to a tail gas treatment unit (e.g., a caustic scrubber). Safety valve discharge ports are strictly prohibited from venting directly to the atmosphere and must be piped to the treatment system. Additionally, fixed chlorine gas concentration detectors and alarms should be installed in the compressor building and areas where leakage could occur, interlocked with the ventilation system.

Certificate

MODEL SELECTION

Z Type

V / W Type

M Type

D Type

Piston stroke 80mm, 95mm	Piston force 10KN～25KN
Power 7.5KW-55KW	Number of cylinder banks 1/2
Crankshaft speed 740 rpm, 980 rpm	Number of compression stages 1/2/3/4
Drive mode Electric motor, diesel engine, natural gas engine

Piston stroke 92mm, 95mm, 105mm, 120mm	Piston force 25KN, 45KN, 65KN
Number of compression stages 1/2/3/4	Number of cylinder banks 2/3/4
Crankshaft speed 740 rpm, 980 rpm	Power 15KW-220KW
Drive mode Electric motor, diesel engine, natural gas engine

Piston stroke 92mm~315mm	Piston force 45KN~660KN
Number of compression stages 1/2/3/4	Number of cylinder banks 4
Crankshaft speed 300rpm~980rpm	Power 160KW-3000KW
Drive mode Electric motor, diesel engine, natural gas engine

Piston stroke 92mm~315mm	Piston force 25KN~200KN
Number of compression stages 1/2/3/4	Number of cylinder banks 2
Crankshaft speed 300rpm~980rpm	Power 30KW-1000KW
Drive mode Electric motor, diesel engine, natural gas engine

Vertical type

Oil-free / F: Air-cooled

2.1

Actual volume flow (m3/min)

0.15

Inlet pressure(barg)

Outlet pressure(barg)

S/N	Model	Flow	Inlet pressure	Outlet pressure	Motor power
S/N	Model	(Nm³/h)	(Mpa)	(MPa)	(kW)
1	ZW-2.1/0.15-15	120	0.015	1.5	22
2	ZW-0.9/6-25	320	0.6	2.5	30
3	ZW-0.63/3-35	120	0.3	3.5	22
4	VW-2.6/5-12	800	0.5	1.2	55
5	VW-14/(1-3)-4	1500	1400 ~ 2900	0.1 ~ 0.3	90
6	VW-5/1-45	500	0.1	4.5	135
7	DW-6.0/(1~3)-25	840	0.1 ~ 0.3	2.5	200
8	DW-0.92/16-25	800	1.6	2.5	185
9	DW-6.7/2-25	1020	0.2	2.5	185
10	MW-154/6	10500	0.05	0.6	1100
11	MW-6/15-21	6000	1.5-2.0	2.1	185
12	M-40/3-7	9000	0.3	0.7	450